Hi

On 7/5/21 11:18 AM, William Breathitt Gray wrote:
> To summarize the main points of this patchset: there are no changes to
> the existing Counter sysfs userspace interface; a Counter character
> device interface is introduced that allows Counter events and associated
> data to be read() by userspace; the events_configure() and
> watch_validate() driver callbacks are introduced to support Counter
> events; and IRQ support is added to the 104-QUAD-8 driver, serving as an
> example of how to support the new Counter events functionality.
>
I quickly tested this set on top of linux-next next-20210706 and didn't
see any issue with intel-qep.c. However I noticed two mutex issues in
patch 15/17. Perhaps visible due the CONFIG_DEBUG_MUTEXES=y etc. I have on.

I'll be out of office next few weeks so cannot test if you have a new
version meanwhile but wanted to share no show stopper from intel-qep.c
and those two mutex warnings.

Jarkko

2021-07-07 00:29:34

2021-07-10 09:43:38

by William Breathitt Gray

[permalink] [raw]

Subject: Re: [PATCH v12 07/17] counter: Update counter.h comments to reflect sysfs internalization

On Fri, Jul 09, 2021 at 12:49:20PM -0500, David Lechner wrote:
> On 7/5/21 3:18 AM, William Breathitt Gray wrote:
> > The Counter subsystem architecture and driver implementations have
> > changed in order to handle Counter sysfs interactions in a more
> > consistent way. This patch updates the Generic Counter interface
> > header file comments to reflect the changes.
> >
> > Signed-off-by: William Breathitt Gray <[email protected]>
> > ---
> > drivers/counter/counter-core.c | 3 +++
> > include/linux/counter.h | 43 ++++++++++++++++------------------
> > 2 files changed, 23 insertions(+), 23 deletions(-)
> >
> > diff --git a/drivers/counter/counter-core.c b/drivers/counter/counter-core.c
> > index 15f735ef296e..9442e3b91468 100644
> > --- a/drivers/counter/counter-core.c
> > +++ b/drivers/counter/counter-core.c
> > @@ -41,6 +41,9 @@ static struct bus_type counter_bus_type = {
> > * This function registers a Counter to the system. A sysfs "counter" directory
> > * will be created and populated with sysfs attributes correlating with the
> > * Counter Signals, Synapses, and Counts respectively.
> > + *
> > + * RETURNS:
> > + * 0 on success, negative error number on failure.
> > */
> > int counter_register(struct counter_device *const counter)
> > {
> > diff --git a/include/linux/counter.h b/include/linux/counter.h
> > index b69277f5c4c5..e7fd6d81a929 100644
> > --- a/include/linux/counter.h
> > +++ b/include/linux/counter.h
> > @@ -188,11 +188,10 @@ struct counter_comp {
> >
> > /**
> > * struct counter_signal - Counter Signal node
> > - * @id: unique ID used to identify signal
> > - * @name: device-specific Signal name; ideally, this should match the name
> > - * as it appears in the datasheet documentation
> > - * @ext: optional array of Counter Signal extensions
> > - * @num_ext: number of Counter Signal extensions specified in @ext
> > + * @id: unique ID used to identify the Signal
> > + * @name: device-specific Signal name
> > + * @ext: optional array of Signal extensions
> > + * @num_ext: number of Signal extensions specified in @ext
> > */
> > struct counter_signal {
> > int id;
> > @@ -206,7 +205,7 @@ struct counter_signal {
> > * struct counter_synapse - Counter Synapse node
> > * @actions_list: array of available action modes
> > * @num_actions: number of action modes specified in @actions_list
> > - * @signal: pointer to associated signal
> > + * @signal: pointer to the associated Signal
> > */
> > struct counter_synapse {
> > const enum counter_synapse_action *actions_list;
> > @@ -217,15 +216,14 @@ struct counter_synapse {
> >
> > /**
> > * struct counter_count - Counter Count node
> > - * @id: unique ID used to identify Count
> > - * @name: device-specific Count name; ideally, this should match
> > - * the name as it appears in the datasheet documentation
> > - * @functions_list: array available function modes
> > + * @id: unique ID used to identify the Count
> > + * @name: device-specific Count name
> > + * @functions_list: array of available function modes
> > * @num_functions: number of function modes specified in @functions_list
> > - * @synapses: array of synapses for initialization
> > - * @num_synapses: number of synapses specified in @synapses
> > - * @ext: optional array of Counter Count extensions
> > - * @num_ext: number of Counter Count extensions specified in @ext
> > + * @synapses: array of Synapses for initialization
> > + * @num_synapses: number of Synapses specified in @synapses
> > + * @ext: optional array of Count extensions
> > + * @num_ext: number of Count extensions specified in @ext
> > */
> > struct counter_count {
> > int id;
> > @@ -243,15 +241,14 @@ struct counter_count {
> >
> > /**
> > * struct counter_ops - Callbacks from driver
> > - * @signal_read: optional read callback for Signal attribute. The read
> > - * level of the respective Signal should be passed back via
> > - * the level parameter.
> > - * @count_read: optional read callback for Count attribute. The read
> > - * value of the respective Count should be passed back via
> > - * the val parameter.
>
> Are these no longer optional? If they really are optional, it would be nice to
> keep that information in the description.

I'd expect drivers to have at least the count_read() and function_read()
callbacks defined and set; otherwise such a counter driver would be
rather useless to a user. I'll update the documentation here to make it
clear the other callbacks are optional.

> > - * @count_write: optional write callback for Count attribute. The write
> > - * value for the respective Count is passed in via the val
> > + * @signal_read: read callback for Signals. The read level of the
> > + * respective Signal should be passed back via the level
> > + * parameter.
> > + * @count_read: read callback for Counts. The read value of the
> > + * respective Count should be passed back via the value
> > * parameter.
> > + * @count_write: write callback for Counts. The write value for the
> > + * respective Count is passed in via the value parameter.
> > * @function_read: read callback the Count function modes. The read
> > * function mode of the respective Count should be passed
> > * back via the function parameter.
> > @@ -291,7 +288,7 @@ struct counter_ops {
> >
> > /**
> > * struct counter_device - Counter data structure
> > - * @name: name of the device as it appears in the datasheet
> > + * @name: name of the device
>
> Is there a recommended naming convention if using the datasheet is no longer
> recommended?

I decided to remove the "as it appears in the datasheet" phrase because
there may be cases where the datasheet name isn't the best name to
provide for the counter device. For example, with the 104-quad-8 driver
there is ambiguity about whether it's more useful for the name to be
"104-QUAD-8" to match the PC104 card, or "LS7266R1" to match the counter
chip integrated on the 104-QUAD-8 card. Another example would be the
recent interrupt-cnt driver which isn't for a particular device (it
counts any interrupt source) so thus does not have a corresponding
datasheet. I figure it's best to leave it up to the driver maintainer to
choose an apt name that will make sense for the users.

William Breathitt Gray

Attachments:

(No filename) (6.36 kB)
signature.asc (849.00 B)
Download all attachments

2021-07-10 10:26:18

On Sat, Jul 10, 2021 at 10:43:22AM -0500, David Lechner wrote:
> On 7/10/21 5:25 AM, William Breathitt Gray wrote:
> >> and after that
> >>
> >> [ 16.564403] ================================================
> >> [ 16.570725] WARNING: lock held when returning to user space!
> >> [ 16.577044] 5.13.0-next-20210706+ #4 Not tainted
> >> [ 16.582198] ------------------------------------------------
> >> [ 16.588507] cat/331 is leaving the kernel with locks still held!
> >> [ 16.595214] 1 lock held by cat/331:
> >> [ 16.599103] #0: ffff888102bb3630
> >> (&counter->chrdev_lock){+.+.}-{3:3}, at: counter_chrdev_open+0x21/0x60
> >> [counter]
> >>
> >> Jarkko
> > I'm not sure how to resolve this warning. The purpose of this lock is to
> > limit chrdev to a single open at a time. To accomplish this I grab this
> > lock in counter_chrdev_open() and hold it until counter_chrdev_release()
> > is called. Is there a better way to accomplish this?
>
> How about using an atomic flag, e.g test_and_set_bit()?

Yes, I think this might work: atomically test and set the bit to lock
and atomically clear it to unlock. I'll replace the mutex with an atomic
flag.

By the way, what is the difference between test_and_set_bit() and
test_and_set_bit_lock()?

William Breathitt Gray

Attachments:

(No filename) (1.28 kB)
signature.asc (849.00 B)
Download all attachments

2021-07-11 09:55:04

by Syed Nayyar Waris

[permalink] [raw]

Subject: Re: [PATCH v12 06/17] counter: Internalize sysfs interface code

On Mon, Jul 5, 2021 at 1:49 PM William Breathitt Gray
<[email protected]> wrote:
>
> This is a reimplementation of the Generic Counter driver interface.
> There are no modifications to the Counter subsystem userspace interface,
> so existing userspace applications should continue to run seamlessly.
>
> The purpose of this patch is to internalize the sysfs interface code
> among the various counter drivers into a shared module. Counter drivers
> pass and take data natively (i.e. u8, u64, etc.) and the shared counter
> module handles the translation between the sysfs interface and the
> device drivers. This guarantees a standard userspace interface for all
> counter drivers, and helps generalize the Generic Counter driver ABI in
> order to support the Generic Counter chrdev interface (introduced in a
> subsequent patch) without significant changes to the existing counter
> drivers.
>
> Note, Counter device registration is the same as before: drivers
> populate a struct counter_device with components and callbacks, then
> pass the structure to the devm_counter_register function. However,
> what's different now is how the Counter subsystem code handles this
> registration internally.
>
> Whereas before callbacks would interact directly with sysfs data, this
> interaction is now abstracted and instead callbacks interact with native
> C data types. The counter_comp structure forms the basis for Counter
> extensions.
>
> The counter-sysfs.c file contains the code to parse through the
> counter_device structure and register the requested components and
> extensions. Attributes are created and populated based on type, with
> respective translation functions to handle the mapping between sysfs and
> the counter driver callbacks.
>
> The translation performed for each attribute is straightforward: the
> attribute type and data is parsed from the counter_attribute structure,
> the respective counter driver read/write callback is called, and sysfs
> I/O is handled before or after the driver read/write function is called.
>
> Cc: Syed Nayyar Waris <[email protected]>
> Cc: Jarkko Nikula <[email protected]>
> Cc: Patrick Havelange <[email protected]>
> Cc: Kamel Bouhara <[email protected]>
> Cc: Fabrice Gasnier <[email protected]>
> Cc: Maxime Coquelin <[email protected]>
> Cc: Alexandre Torgue <[email protected]>
> Cc: Dan Carpenter <[email protected]>
> Reviewed-by: David Lechner <[email protected]>
> Tested-by: David Lechner <[email protected]>
> Signed-off-by: William Breathitt Gray <[email protected]>
> ---
> MAINTAINERS | 1 -
> drivers/counter/104-quad-8.c | 449 +++----

For 104-Quad-8,

Acked-by: Syed Nayyar Waris <[email protected]>

> drivers/counter/Makefile | 1 +
> drivers/counter/counter-core.c | 145 +++
> drivers/counter/counter-sysfs.c | 846 +++++++++++++
> drivers/counter/counter-sysfs.h | 13 +
> drivers/counter/counter.c | 1496 -----------------------
> drivers/counter/ftm-quaddec.c | 56 +-
> drivers/counter/intel-qep.c | 144 +--
> drivers/counter/interrupt-cnt.c | 62 +-
> drivers/counter/microchip-tcb-capture.c | 93 +-
> drivers/counter/stm32-lptimer-cnt.c | 162 ++-
> drivers/counter/stm32-timer-cnt.c | 147 +--
> drivers/counter/ti-eqep.c | 180 +--
> include/linux/counter.h | 658 +++++-----
> include/linux/counter_enum.h | 45 -
> 16 files changed, 1920 insertions(+), 2578 deletions(-)
> create mode 100644 drivers/counter/counter-core.c
> create mode 100644 drivers/counter/counter-sysfs.c
> create mode 100644 drivers/counter/counter-sysfs.h
> delete mode 100644 drivers/counter/counter.c
> delete mode 100644 include/linux/counter_enum.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 9bf553e53f0f..2cac15216ba9 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -4687,7 +4687,6 @@ F: Documentation/ABI/testing/sysfs-bus-counter
> F: Documentation/driver-api/generic-counter.rst
> F: drivers/counter/
> F: include/linux/counter.h
> -F: include/linux/counter_enum.h
>
> CP2615 I2C DRIVER
> M: Bence Csókás <[email protected]>
> diff --git a/drivers/counter/104-quad-8.c b/drivers/counter/104-quad-8.c
> index 5283ff128c17..d1161c27c488 100644
> --- a/drivers/counter/104-quad-8.c
> +++ b/drivers/counter/104-quad-8.c
> @@ -116,7 +116,7 @@ static int quad8_signal_read(struct counter_device *counter,
> }
>
> static int quad8_count_read(struct counter_device *counter,
> - struct counter_count *count, unsigned long *val)
> + struct counter_count *count, u64 *val)
> {
> struct quad8 *const priv = counter->priv;
> const int base_offset = priv->base + 2 * count->id;
> @@ -147,7 +147,7 @@ static int quad8_count_read(struct counter_device *counter,
> }
>
> static int quad8_count_write(struct counter_device *counter,
> - struct counter_count *count, unsigned long val)
> + struct counter_count *count, u64 val)
> {
> struct quad8 *const priv = counter->priv;
> const int base_offset = priv->base + 2 * count->id;
> @@ -187,22 +187,16 @@ static int quad8_count_write(struct counter_device *counter,
> return 0;
> }
>
> -enum quad8_count_function {
> - QUAD8_COUNT_FUNCTION_PULSE_DIRECTION = 0,
> - QUAD8_COUNT_FUNCTION_QUADRATURE_X1,
> - QUAD8_COUNT_FUNCTION_QUADRATURE_X2,
> - QUAD8_COUNT_FUNCTION_QUADRATURE_X4
> -};
> -
> static const enum counter_function quad8_count_functions_list[] = {
> - [QUAD8_COUNT_FUNCTION_PULSE_DIRECTION] = COUNTER_FUNCTION_PULSE_DIRECTION,
> - [QUAD8_COUNT_FUNCTION_QUADRATURE_X1] = COUNTER_FUNCTION_QUADRATURE_X1_A,
> - [QUAD8_COUNT_FUNCTION_QUADRATURE_X2] = COUNTER_FUNCTION_QUADRATURE_X2_A,
> - [QUAD8_COUNT_FUNCTION_QUADRATURE_X4] = COUNTER_FUNCTION_QUADRATURE_X4
> + COUNTER_FUNCTION_PULSE_DIRECTION,
> + COUNTER_FUNCTION_QUADRATURE_X1_A,
> + COUNTER_FUNCTION_QUADRATURE_X2_A,
> + COUNTER_FUNCTION_QUADRATURE_X4,
> };
>
> -static int quad8_function_get(struct counter_device *counter,
> - struct counter_count *count, size_t *function)
> +static int quad8_function_read(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_function *function)
> {
> struct quad8 *const priv = counter->priv;
> const int id = count->id;
> @@ -212,25 +206,26 @@ static int quad8_function_get(struct counter_device *counter,
> if (priv->quadrature_mode[id])
> switch (priv->quadrature_scale[id]) {
> case 0:
> - *function = QUAD8_COUNT_FUNCTION_QUADRATURE_X1;
> + *function = COUNTER_FUNCTION_QUADRATURE_X1_A;
> break;
> case 1:
> - *function = QUAD8_COUNT_FUNCTION_QUADRATURE_X2;
> + *function = COUNTER_FUNCTION_QUADRATURE_X2_A;
> break;
> case 2:
> - *function = QUAD8_COUNT_FUNCTION_QUADRATURE_X4;
> + *function = COUNTER_FUNCTION_QUADRATURE_X4;
> break;
> }
> else
> - *function = QUAD8_COUNT_FUNCTION_PULSE_DIRECTION;
> + *function = COUNTER_FUNCTION_PULSE_DIRECTION;
>
> mutex_unlock(&priv->lock);
>
> return 0;
> }
>
> -static int quad8_function_set(struct counter_device *counter,
> - struct counter_count *count, size_t function)
> +static int quad8_function_write(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_function function)
> {
> struct quad8 *const priv = counter->priv;
> const int id = count->id;
> @@ -246,7 +241,7 @@ static int quad8_function_set(struct counter_device *counter,
> mode_cfg = priv->count_mode[id] << 1;
> idr_cfg = priv->index_polarity[id] << 1;
>
> - if (function == QUAD8_COUNT_FUNCTION_PULSE_DIRECTION) {
> + if (function == COUNTER_FUNCTION_PULSE_DIRECTION) {
> *quadrature_mode = 0;
>
> /* Quadrature scaling only available in quadrature mode */
> @@ -262,15 +257,15 @@ static int quad8_function_set(struct counter_device *counter,
> *quadrature_mode = 1;
>
> switch (function) {
> - case QUAD8_COUNT_FUNCTION_QUADRATURE_X1:
> + case COUNTER_FUNCTION_QUADRATURE_X1_A:
> *scale = 0;
> mode_cfg |= QUAD8_CMR_QUADRATURE_X1;
> break;
> - case QUAD8_COUNT_FUNCTION_QUADRATURE_X2:
> + case COUNTER_FUNCTION_QUADRATURE_X2_A:
> *scale = 1;
> mode_cfg |= QUAD8_CMR_QUADRATURE_X2;
> break;
> - case QUAD8_COUNT_FUNCTION_QUADRATURE_X4:
> + case COUNTER_FUNCTION_QUADRATURE_X4:
> *scale = 2;
> mode_cfg |= QUAD8_CMR_QUADRATURE_X4;
> break;
> @@ -289,8 +284,9 @@ static int quad8_function_set(struct counter_device *counter,
> return 0;
> }
>
> -static void quad8_direction_get(struct counter_device *counter,
> - struct counter_count *count, enum counter_count_direction *direction)
> +static int quad8_direction_read(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_count_direction *direction)
> {
> const struct quad8 *const priv = counter->priv;
> unsigned int ud_flag;
> @@ -301,76 +297,74 @@ static void quad8_direction_get(struct counter_device *counter,
>
> *direction = (ud_flag) ? COUNTER_COUNT_DIRECTION_FORWARD :
> COUNTER_COUNT_DIRECTION_BACKWARD;
> -}
>
> -enum quad8_synapse_action {
> - QUAD8_SYNAPSE_ACTION_NONE = 0,
> - QUAD8_SYNAPSE_ACTION_RISING_EDGE,
> - QUAD8_SYNAPSE_ACTION_FALLING_EDGE,
> - QUAD8_SYNAPSE_ACTION_BOTH_EDGES
> -};
> + return 0;
> +}
>
> static const enum counter_synapse_action quad8_index_actions_list[] = {
> - [QUAD8_SYNAPSE_ACTION_NONE] = COUNTER_SYNAPSE_ACTION_NONE,
> - [QUAD8_SYNAPSE_ACTION_RISING_EDGE] = COUNTER_SYNAPSE_ACTION_RISING_EDGE
> + COUNTER_SYNAPSE_ACTION_NONE,
> + COUNTER_SYNAPSE_ACTION_RISING_EDGE,
> };
>
> static const enum counter_synapse_action quad8_synapse_actions_list[] = {
> - [QUAD8_SYNAPSE_ACTION_NONE] = COUNTER_SYNAPSE_ACTION_NONE,
> - [QUAD8_SYNAPSE_ACTION_RISING_EDGE] = COUNTER_SYNAPSE_ACTION_RISING_EDGE,
> - [QUAD8_SYNAPSE_ACTION_FALLING_EDGE] = COUNTER_SYNAPSE_ACTION_FALLING_EDGE,
> - [QUAD8_SYNAPSE_ACTION_BOTH_EDGES] = COUNTER_SYNAPSE_ACTION_BOTH_EDGES
> + COUNTER_SYNAPSE_ACTION_NONE,
> + COUNTER_SYNAPSE_ACTION_RISING_EDGE,
> + COUNTER_SYNAPSE_ACTION_FALLING_EDGE,
> + COUNTER_SYNAPSE_ACTION_BOTH_EDGES,
> };
>
> -static int quad8_action_get(struct counter_device *counter,
> - struct counter_count *count, struct counter_synapse *synapse,
> - size_t *action)
> +static int quad8_action_read(struct counter_device *counter,
> + struct counter_count *count,
> + struct counter_synapse *synapse,
> + enum counter_synapse_action *action)
> {
> struct quad8 *const priv = counter->priv;
> int err;
> - size_t function = 0;
> + enum counter_function function;
> const size_t signal_a_id = count->synapses[0].signal->id;
> enum counter_count_direction direction;
>
> /* Handle Index signals */
> if (synapse->signal->id >= 16) {
> if (priv->preset_enable[count->id])
> - *action = QUAD8_SYNAPSE_ACTION_RISING_EDGE;
> + *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE;
> else
> - *action = QUAD8_SYNAPSE_ACTION_NONE;
> + *action = COUNTER_SYNAPSE_ACTION_NONE;
>
> return 0;
> }
>
> - err = quad8_function_get(counter, count, &function);
> + err = quad8_function_read(counter, count, &function);
> if (err)
> return err;
>
> /* Default action mode */
> - *action = QUAD8_SYNAPSE_ACTION_NONE;
> + *action = COUNTER_SYNAPSE_ACTION_NONE;
>
> /* Determine action mode based on current count function mode */
> switch (function) {
> - case QUAD8_COUNT_FUNCTION_PULSE_DIRECTION:
> + case COUNTER_FUNCTION_PULSE_DIRECTION:
> if (synapse->signal->id == signal_a_id)
> - *action = QUAD8_SYNAPSE_ACTION_RISING_EDGE;
> + *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE;
> return 0;
> - case QUAD8_COUNT_FUNCTION_QUADRATURE_X1:
> + case COUNTER_FUNCTION_QUADRATURE_X1_A:
> if (synapse->signal->id == signal_a_id) {
> - quad8_direction_get(counter, count, &direction);
> + err = quad8_direction_read(counter, count, &direction);
> + if (err)
> + return err;
>
> if (direction == COUNTER_COUNT_DIRECTION_FORWARD)
> - *action = QUAD8_SYNAPSE_ACTION_RISING_EDGE;
> + *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE;
> else
> - *action = QUAD8_SYNAPSE_ACTION_FALLING_EDGE;
> + *action = COUNTER_SYNAPSE_ACTION_FALLING_EDGE;
> }
> return 0;
> - case QUAD8_COUNT_FUNCTION_QUADRATURE_X2:
> + case COUNTER_FUNCTION_QUADRATURE_X2_A:
> if (synapse->signal->id == signal_a_id)
> - *action = QUAD8_SYNAPSE_ACTION_BOTH_EDGES;
> + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
> return 0;
> - case QUAD8_COUNT_FUNCTION_QUADRATURE_X4:
> - *action = QUAD8_SYNAPSE_ACTION_BOTH_EDGES;
> + case COUNTER_FUNCTION_QUADRATURE_X4:
> + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
> return 0;
> default:
> /* should never reach this path */
> @@ -382,9 +376,9 @@ static const struct counter_ops quad8_ops = {
> .signal_read = quad8_signal_read,
> .count_read = quad8_count_read,
> .count_write = quad8_count_write,
> - .function_get = quad8_function_get,
> - .function_set = quad8_function_set,
> - .action_get = quad8_action_get
> + .function_read = quad8_function_read,
> + .function_write = quad8_function_write,
> + .action_read = quad8_action_read
> };
>
> static const char *const quad8_index_polarity_modes[] = {
> @@ -393,7 +387,8 @@ static const char *const quad8_index_polarity_modes[] = {
> };
>
> static int quad8_index_polarity_get(struct counter_device *counter,
> - struct counter_signal *signal, size_t *index_polarity)
> + struct counter_signal *signal,
> + u32 *index_polarity)
> {
> const struct quad8 *const priv = counter->priv;
> const size_t channel_id = signal->id - 16;
> @@ -404,7 +399,8 @@ static int quad8_index_polarity_get(struct counter_device *counter,
> }
>
> static int quad8_index_polarity_set(struct counter_device *counter,
> - struct counter_signal *signal, size_t index_polarity)
> + struct counter_signal *signal,
> + u32 index_polarity)
> {
> struct quad8 *const priv = counter->priv;
> const size_t channel_id = signal->id - 16;
> @@ -425,20 +421,14 @@ static int quad8_index_polarity_set(struct counter_device *counter,
> return 0;
> }
>
> -static struct counter_signal_enum_ext quad8_index_pol_enum = {
> - .items = quad8_index_polarity_modes,
> - .num_items = ARRAY_SIZE(quad8_index_polarity_modes),
> - .get = quad8_index_polarity_get,
> - .set = quad8_index_polarity_set
> -};
> -
> static const char *const quad8_synchronous_modes[] = {
> "non-synchronous",
> "synchronous"
> };
>
> static int quad8_synchronous_mode_get(struct counter_device *counter,
> - struct counter_signal *signal, size_t *synchronous_mode)
> + struct counter_signal *signal,
> + u32 *synchronous_mode)
> {
> const struct quad8 *const priv = counter->priv;
> const size_t channel_id = signal->id - 16;
> @@ -449,7 +439,8 @@ static int quad8_synchronous_mode_get(struct counter_device *counter,
> }
>
> static int quad8_synchronous_mode_set(struct counter_device *counter,
> - struct counter_signal *signal, size_t synchronous_mode)
> + struct counter_signal *signal,
> + u32 synchronous_mode)
> {
> struct quad8 *const priv = counter->priv;
> const size_t channel_id = signal->id - 16;
> @@ -476,22 +467,18 @@ static int quad8_synchronous_mode_set(struct counter_device *counter,
> return 0;
> }
>
> -static struct counter_signal_enum_ext quad8_syn_mode_enum = {
> - .items = quad8_synchronous_modes,
> - .num_items = ARRAY_SIZE(quad8_synchronous_modes),
> - .get = quad8_synchronous_mode_get,
> - .set = quad8_synchronous_mode_set
> -};
> -
> -static ssize_t quad8_count_floor_read(struct counter_device *counter,
> - struct counter_count *count, void *private, char *buf)
> +static int quad8_count_floor_read(struct counter_device *counter,
> + struct counter_count *count, u64 *floor)
> {
> /* Only a floor of 0 is supported */
> - return sprintf(buf, "0\n");
> + *floor = 0;
> +
> + return 0;
> }
>
> -static int quad8_count_mode_get(struct counter_device *counter,
> - struct counter_count *count, size_t *cnt_mode)
> +static int quad8_count_mode_read(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_count_mode *cnt_mode)
> {
> const struct quad8 *const priv = counter->priv;
>
> @@ -514,26 +501,28 @@ static int quad8_count_mode_get(struct counter_device *counter,
> return 0;
> }
>
> -static int quad8_count_mode_set(struct counter_device *counter,
> - struct counter_count *count, size_t cnt_mode)
> +static int quad8_count_mode_write(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_count_mode cnt_mode)
> {
> struct quad8 *const priv = counter->priv;
> + unsigned int count_mode;
> unsigned int mode_cfg;
> const int base_offset = priv->base + 2 * count->id + 1;
>
> /* Map Generic Counter count mode to 104-QUAD-8 count mode */
> switch (cnt_mode) {
> case COUNTER_COUNT_MODE_NORMAL:
> - cnt_mode = 0;
> + count_mode = 0;
> break;
> case COUNTER_COUNT_MODE_RANGE_LIMIT:
> - cnt_mode = 1;
> + count_mode = 1;
> break;
> case COUNTER_COUNT_MODE_NON_RECYCLE:
> - cnt_mode = 2;
> + count_mode = 2;
> break;
> case COUNTER_COUNT_MODE_MODULO_N:
> - cnt_mode = 3;
> + count_mode = 3;
> break;
> default:
> /* should never reach this path */
> @@ -542,10 +531,10 @@ static int quad8_count_mode_set(struct counter_device *counter,
>
> mutex_lock(&priv->lock);
>
> - priv->count_mode[count->id] = cnt_mode;
> + priv->count_mode[count->id] = count_mode;
>
> /* Set count mode configuration value */
> - mode_cfg = cnt_mode << 1;
> + mode_cfg = count_mode << 1;
>
> /* Add quadrature mode configuration */
> if (priv->quadrature_mode[count->id])
> @@ -559,56 +548,35 @@ static int quad8_count_mode_set(struct counter_device *counter,
> return 0;
> }
>
> -static struct counter_count_enum_ext quad8_cnt_mode_enum = {
> - .items = counter_count_mode_str,
> - .num_items = ARRAY_SIZE(counter_count_mode_str),
> - .get = quad8_count_mode_get,
> - .set = quad8_count_mode_set
> -};
> -
> -static ssize_t quad8_count_direction_read(struct counter_device *counter,
> - struct counter_count *count, void *priv, char *buf)
> -{
> - enum counter_count_direction dir;
> -
> - quad8_direction_get(counter, count, &dir);
> -
> - return sprintf(buf, "%s\n", counter_count_direction_str[dir]);
> -}
> -
> -static ssize_t quad8_count_enable_read(struct counter_device *counter,
> - struct counter_count *count, void *private, char *buf)
> +static int quad8_count_enable_read(struct counter_device *counter,
> + struct counter_count *count, u8 *enable)
> {
> const struct quad8 *const priv = counter->priv;
>
> - return sprintf(buf, "%u\n", priv->ab_enable[count->id]);
> + *enable = priv->ab_enable[count->id];
> +
> + return 0;
> }
>
> -static ssize_t quad8_count_enable_write(struct counter_device *counter,
> - struct counter_count *count, void *private, const char *buf, size_t len)
> +static int quad8_count_enable_write(struct counter_device *counter,
> + struct counter_count *count, u8 enable)
> {
> struct quad8 *const priv = counter->priv;
> const int base_offset = priv->base + 2 * count->id;
> - int err;
> - bool ab_enable;
> unsigned int ior_cfg;
>
> - err = kstrtobool(buf, &ab_enable);
> - if (err)
> - return err;
> -
> mutex_lock(&priv->lock);
>
> - priv->ab_enable[count->id] = ab_enable;
> + priv->ab_enable[count->id] = enable;
>
> - ior_cfg = ab_enable | priv->preset_enable[count->id] << 1;
> + ior_cfg = enable | priv->preset_enable[count->id] << 1;
>
> /* Load I/O control configuration */
> outb(QUAD8_CTR_IOR | ior_cfg, base_offset + 1);
>
> mutex_unlock(&priv->lock);
>
> - return len;
> + return 0;
> }
>
> static const char *const quad8_noise_error_states[] = {
> @@ -617,7 +585,7 @@ static const char *const quad8_noise_error_states[] = {
> };
>
> static int quad8_error_noise_get(struct counter_device *counter,
> - struct counter_count *count, size_t *noise_error)
> + struct counter_count *count, u32 *noise_error)
> {
> const struct quad8 *const priv = counter->priv;
> const int base_offset = priv->base + 2 * count->id + 1;
> @@ -627,18 +595,14 @@ static int quad8_error_noise_get(struct counter_device *counter,
> return 0;
> }
>
> -static struct counter_count_enum_ext quad8_error_noise_enum = {
> - .items = quad8_noise_error_states,
> - .num_items = ARRAY_SIZE(quad8_noise_error_states),
> - .get = quad8_error_noise_get
> -};
> -
> -static ssize_t quad8_count_preset_read(struct counter_device *counter,
> - struct counter_count *count, void *private, char *buf)
> +static int quad8_count_preset_read(struct counter_device *counter,
> + struct counter_count *count, u64 *preset)
> {
> const struct quad8 *const priv = counter->priv;
>
> - return sprintf(buf, "%u\n", priv->preset[count->id]);
> + *preset = priv->preset[count->id];
> +
> + return 0;
> }
>
> static void quad8_preset_register_set(struct quad8 *const priv, const int id,
> @@ -657,16 +621,10 @@ static void quad8_preset_register_set(struct quad8 *const priv, const int id,
> outb(preset >> (8 * i), base_offset);
> }
>
> -static ssize_t quad8_count_preset_write(struct counter_device *counter,
> - struct counter_count *count, void *private, const char *buf, size_t len)
> +static int quad8_count_preset_write(struct counter_device *counter,
> + struct counter_count *count, u64 preset)
> {
> struct quad8 *const priv = counter->priv;
> - unsigned int preset;
> - int ret;
> -
> - ret = kstrtouint(buf, 0, &preset);
> - if (ret)
> - return ret;
>
> /* Only 24-bit values are supported */
> if (preset > 0xFFFFFF)
> @@ -678,11 +636,11 @@ static ssize_t quad8_count_preset_write(struct counter_device *counter,
>
> mutex_unlock(&priv->lock);
>
> - return len;
> + return 0;
> }
>
> -static ssize_t quad8_count_ceiling_read(struct counter_device *counter,
> - struct counter_count *count, void *private, char *buf)
> +static int quad8_count_ceiling_read(struct counter_device *counter,
> + struct counter_count *count, u64 *ceiling)
> {
> struct quad8 *const priv = counter->priv;
>
> @@ -692,26 +650,23 @@ static ssize_t quad8_count_ceiling_read(struct counter_device *counter,
> switch (priv->count_mode[count->id]) {
> case 1:
> case 3:
> - mutex_unlock(&priv->lock);
> - return sprintf(buf, "%u\n", priv->preset[count->id]);
> + *ceiling = priv->preset[count->id];
> + break;
> + default:
> + /* By default 0x1FFFFFF (25 bits unsigned) is maximum count */
> + *ceiling = 0x1FFFFFF;
> + break;
> }
>
> mutex_unlock(&priv->lock);
>
> - /* By default 0x1FFFFFF (25 bits unsigned) is maximum count */
> - return sprintf(buf, "33554431\n");
> + return 0;
> }
>
> -static ssize_t quad8_count_ceiling_write(struct counter_device *counter,
> - struct counter_count *count, void *private, const char *buf, size_t len)
> +static int quad8_count_ceiling_write(struct counter_device *counter,
> + struct counter_count *count, u64 ceiling)
> {
> struct quad8 *const priv = counter->priv;
> - unsigned int ceiling;
> - int ret;
> -
> - ret = kstrtouint(buf, 0, &ceiling);
> - if (ret)
> - return ret;
>
> /* Only 24-bit values are supported */
> if (ceiling > 0xFFFFFF)
> @@ -725,7 +680,7 @@ static ssize_t quad8_count_ceiling_write(struct counter_device *counter,
> case 3:
> quad8_preset_register_set(priv, count->id, ceiling);
> mutex_unlock(&priv->lock);
> - return len;
> + return 0;
> }
>
> mutex_unlock(&priv->lock);
> @@ -733,27 +688,25 @@ static ssize_t quad8_count_ceiling_write(struct counter_device *counter,
> return -EINVAL;
> }
>
> -static ssize_t quad8_count_preset_enable_read(struct counter_device *counter,
> - struct counter_count *count, void *private, char *buf)
> +static int quad8_count_preset_enable_read(struct counter_device *counter,
> + struct counter_count *count,
> + u8 *preset_enable)
> {
> const struct quad8 *const priv = counter->priv;
>
> - return sprintf(buf, "%u\n", !priv->preset_enable[count->id]);
> + *preset_enable = !priv->preset_enable[count->id];
> +
> + return 0;
> }
>
> -static ssize_t quad8_count_preset_enable_write(struct counter_device *counter,
> - struct counter_count *count, void *private, const char *buf, size_t len)
> +static int quad8_count_preset_enable_write(struct counter_device *counter,
> + struct counter_count *count,
> + u8 preset_enable)
> {
> struct quad8 *const priv = counter->priv;
> const int base_offset = priv->base + 2 * count->id + 1;
> - bool preset_enable;
> - int ret;
> unsigned int ior_cfg;
>
> - ret = kstrtobool(buf, &preset_enable);
> - if (ret)
> - return ret;
> -
> /* Preset enable is active low in Input/Output Control register */
> preset_enable = !preset_enable;
>
> @@ -761,25 +714,24 @@ static ssize_t quad8_count_preset_enable_write(struct counter_device *counter,
>
> priv->preset_enable[count->id] = preset_enable;
>
> - ior_cfg = priv->ab_enable[count->id] | (unsigned int)preset_enable << 1;
> + ior_cfg = priv->ab_enable[count->id] | preset_enable << 1;
>
> /* Load I/O control configuration to Input / Output Control Register */
> outb(QUAD8_CTR_IOR | ior_cfg, base_offset);
>
> mutex_unlock(&priv->lock);
>
> - return len;
> + return 0;
> }
>
> -static ssize_t quad8_signal_cable_fault_read(struct counter_device *counter,
> - struct counter_signal *signal,
> - void *private, char *buf)
> +static int quad8_signal_cable_fault_read(struct counter_device *counter,
> + struct counter_signal *signal,
> + u8 *cable_fault)
> {
> struct quad8 *const priv = counter->priv;
> const size_t channel_id = signal->id / 2;
> bool disabled;
> unsigned int status;
> - unsigned int fault;
>
> mutex_lock(&priv->lock);
>
> @@ -796,36 +748,31 @@ static ssize_t quad8_signal_cable_fault_read(struct counter_device *counter,
> mutex_unlock(&priv->lock);
>
> /* Mask respective channel and invert logic */
> - fault = !(status & BIT(channel_id));
> + *cable_fault = !(status & BIT(channel_id));
>
> - return sprintf(buf, "%u\n", fault);
> + return 0;
> }
>
> -static ssize_t quad8_signal_cable_fault_enable_read(
> - struct counter_device *counter, struct counter_signal *signal,
> - void *private, char *buf)
> +static int quad8_signal_cable_fault_enable_read(struct counter_device *counter,
> + struct counter_signal *signal,
> + u8 *enable)
> {
> const struct quad8 *const priv = counter->priv;
> const size_t channel_id = signal->id / 2;
> - const unsigned int enb = !!(priv->cable_fault_enable & BIT(channel_id));
>
> - return sprintf(buf, "%u\n", enb);
> + *enable = !!(priv->cable_fault_enable & BIT(channel_id));
> +
> + return 0;
> }
>
> -static ssize_t quad8_signal_cable_fault_enable_write(
> - struct counter_device *counter, struct counter_signal *signal,
> - void *private, const char *buf, size_t len)
> +static int quad8_signal_cable_fault_enable_write(struct counter_device *counter,
> + struct counter_signal *signal,
> + u8 enable)
> {
> struct quad8 *const priv = counter->priv;
> const size_t channel_id = signal->id / 2;
> - bool enable;
> - int ret;
> unsigned int cable_fault_enable;
>
> - ret = kstrtobool(buf, &enable);
> - if (ret)
> - return ret;
> -
> mutex_lock(&priv->lock);
>
> if (enable)
> @@ -840,31 +787,27 @@ static ssize_t quad8_signal_cable_fault_enable_write(
>
> mutex_unlock(&priv->lock);
>
> - return len;
> + return 0;
> }
>
> -static ssize_t quad8_signal_fck_prescaler_read(struct counter_device *counter,
> - struct counter_signal *signal, void *private, char *buf)
> +static int quad8_signal_fck_prescaler_read(struct counter_device *counter,
> + struct counter_signal *signal,
> + u8 *prescaler)
> {
> const struct quad8 *const priv = counter->priv;
> - const size_t channel_id = signal->id / 2;
>
> - return sprintf(buf, "%u\n", priv->fck_prescaler[channel_id]);
> + *prescaler = priv->fck_prescaler[signal->id / 2];
> +
> + return 0;
> }
>
> -static ssize_t quad8_signal_fck_prescaler_write(struct counter_device *counter,
> - struct counter_signal *signal, void *private, const char *buf,
> - size_t len)
> +static int quad8_signal_fck_prescaler_write(struct counter_device *counter,
> + struct counter_signal *signal,
> + u8 prescaler)
> {
> struct quad8 *const priv = counter->priv;
> const size_t channel_id = signal->id / 2;
> const int base_offset = priv->base + 2 * channel_id;
> - u8 prescaler;
> - int ret;
> -
> - ret = kstrtou8(buf, 0, &prescaler);
> - if (ret)
> - return ret;
>
> mutex_lock(&priv->lock);
>
> @@ -880,31 +823,30 @@ static ssize_t quad8_signal_fck_prescaler_write(struct counter_device *counter,
>
> mutex_unlock(&priv->lock);
>
> - return len;
> + return 0;
> }
>
> -static const struct counter_signal_ext quad8_signal_ext[] = {
> - {
> - .name = "cable_fault",
> - .read = quad8_signal_cable_fault_read
> - },
> - {
> - .name = "cable_fault_enable",
> - .read = quad8_signal_cable_fault_enable_read,
> - .write = quad8_signal_cable_fault_enable_write
> - },
> - {
> - .name = "filter_clock_prescaler",
> - .read = quad8_signal_fck_prescaler_read,
> - .write = quad8_signal_fck_prescaler_write
> - }
> +static struct counter_comp quad8_signal_ext[] = {
> + COUNTER_COMP_SIGNAL_BOOL("cable_fault", quad8_signal_cable_fault_read,
> + NULL),
> + COUNTER_COMP_SIGNAL_BOOL("cable_fault_enable",
> + quad8_signal_cable_fault_enable_read,
> + quad8_signal_cable_fault_enable_write),
> + COUNTER_COMP_SIGNAL_U8("filter_clock_prescaler",
> + quad8_signal_fck_prescaler_read,
> + quad8_signal_fck_prescaler_write)
> };
>
> -static const struct counter_signal_ext quad8_index_ext[] = {
> - COUNTER_SIGNAL_ENUM("index_polarity", &quad8_index_pol_enum),
> - COUNTER_SIGNAL_ENUM_AVAILABLE("index_polarity", &quad8_index_pol_enum),
> - COUNTER_SIGNAL_ENUM("synchronous_mode", &quad8_syn_mode_enum),
> - COUNTER_SIGNAL_ENUM_AVAILABLE("synchronous_mode", &quad8_syn_mode_enum)
> +static DEFINE_COUNTER_ENUM(quad8_index_pol_enum, quad8_index_polarity_modes);
> +static DEFINE_COUNTER_ENUM(quad8_synch_mode_enum, quad8_synchronous_modes);
> +
> +static struct counter_comp quad8_index_ext[] = {
> + COUNTER_COMP_SIGNAL_ENUM("index_polarity", quad8_index_polarity_get,
> + quad8_index_polarity_set,
> + quad8_index_pol_enum),
> + COUNTER_COMP_SIGNAL_ENUM("synchronous_mode", quad8_synchronous_mode_get,
> + quad8_synchronous_mode_set,
> + quad8_synch_mode_enum),
> };
>
> #define QUAD8_QUAD_SIGNAL(_id, _name) { \
> @@ -973,39 +915,30 @@ static struct counter_synapse quad8_count_synapses[][3] = {
> QUAD8_COUNT_SYNAPSES(6), QUAD8_COUNT_SYNAPSES(7)
> };
>
> -static const struct counter_count_ext quad8_count_ext[] = {
> - {
> - .name = "ceiling",
> - .read = quad8_count_ceiling_read,
> - .write = quad8_count_ceiling_write
> - },
> - {
> - .name = "floor",
> - .read = quad8_count_floor_read
> - },
> - COUNTER_COUNT_ENUM("count_mode", &quad8_cnt_mode_enum),
> - COUNTER_COUNT_ENUM_AVAILABLE("count_mode", &quad8_cnt_mode_enum),
> - {
> - .name = "direction",
> - .read = quad8_count_direction_read
> - },
> - {
> - .name = "enable",
> - .read = quad8_count_enable_read,
> - .write = quad8_count_enable_write
> - },
> - COUNTER_COUNT_ENUM("error_noise", &quad8_error_noise_enum),
> - COUNTER_COUNT_ENUM_AVAILABLE("error_noise", &quad8_error_noise_enum),
> - {
> - .name = "preset",
> - .read = quad8_count_preset_read,
> - .write = quad8_count_preset_write
> - },
> - {
> - .name = "preset_enable",
> - .read = quad8_count_preset_enable_read,
> - .write = quad8_count_preset_enable_write
> - }
> +static const enum counter_count_mode quad8_cnt_modes[] = {
> + COUNTER_COUNT_MODE_NORMAL,
> + COUNTER_COUNT_MODE_RANGE_LIMIT,
> + COUNTER_COUNT_MODE_NON_RECYCLE,
> + COUNTER_COUNT_MODE_MODULO_N,
> +};
> +
> +static DEFINE_COUNTER_AVAILABLE(quad8_count_mode_available, quad8_cnt_modes);
> +
> +static DEFINE_COUNTER_ENUM(quad8_error_noise_enum, quad8_noise_error_states);
> +
> +static struct counter_comp quad8_count_ext[] = {
> + COUNTER_COMP_CEILING(quad8_count_ceiling_read,
> + quad8_count_ceiling_write),
> + COUNTER_COMP_FLOOR(quad8_count_floor_read, NULL),
> + COUNTER_COMP_COUNT_MODE(quad8_count_mode_read, quad8_count_mode_write,
> + quad8_count_mode_available),
> + COUNTER_COMP_DIRECTION(quad8_direction_read),
> + COUNTER_COMP_ENABLE(quad8_count_enable_read, quad8_count_enable_write),
> + COUNTER_COMP_COUNT_ENUM("error_noise", quad8_error_noise_get, NULL,
> + quad8_error_noise_enum),
> + COUNTER_COMP_PRESET(quad8_count_preset_read, quad8_count_preset_write),
> + COUNTER_COMP_PRESET_ENABLE(quad8_count_preset_enable_read,
> + quad8_count_preset_enable_write),
> };
>
> #define QUAD8_COUNT(_id, _cntname) { \
> diff --git a/drivers/counter/Makefile b/drivers/counter/Makefile
> index 19742e6f5e3e..1ab7e087fdc2 100644
> --- a/drivers/counter/Makefile
> +++ b/drivers/counter/Makefile
> @@ -4,6 +4,7 @@
> #
>
> obj-$(CONFIG_COUNTER) += counter.o
> +counter-y := counter-core.o counter-sysfs.o
>
> obj-$(CONFIG_104_QUAD_8) += 104-quad-8.o
> obj-$(CONFIG_INTERRUPT_CNT) += interrupt-cnt.o
> diff --git a/drivers/counter/counter-core.c b/drivers/counter/counter-core.c
> new file mode 100644
> index 000000000000..15f735ef296e
> --- /dev/null
> +++ b/drivers/counter/counter-core.c
> @@ -0,0 +1,145 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Generic Counter interface
> + * Copyright (C) 2020 William Breathitt Gray
> + */
> +#include <linux/counter.h>
> +#include <linux/device.h>
> +#include <linux/export.h>
> +#include <linux/gfp.h>
> +#include <linux/idr.h>
> +#include <linux/init.h>
> +#include <linux/module.h>
> +
> +#include "counter-sysfs.h"
> +
> +/* Provides a unique ID for each counter device */
> +static DEFINE_IDA(counter_ida);
> +
> +static void counter_device_release(struct device *dev)
> +{
> + struct counter_device *const counter = dev_get_drvdata(dev);
> +
> + counter_chrdev_remove(counter);
> + ida_free(&counter_ida, dev->id);
> +}
> +
> +static struct device_type counter_device_type = {
> + .name = "counter_device",
> + .release = counter_device_release,
> +};
> +
> +static struct bus_type counter_bus_type = {
> + .name = "counter",
> + .dev_name = "counter",
> +};
> +
> +/**
> + * counter_register - register Counter to the system
> + * @counter: pointer to Counter to register
> + *
> + * This function registers a Counter to the system. A sysfs "counter" directory
> + * will be created and populated with sysfs attributes correlating with the
> + * Counter Signals, Synapses, and Counts respectively.
> + */
> +int counter_register(struct counter_device *const counter)
> +{
> + struct device *const dev = &counter->dev;
> + int id;
> + int err;
> +
> + /* Acquire unique ID */
> + id = ida_alloc(&counter_ida, GFP_KERNEL);
> + if (id < 0)
> + return id;
> +
> + /* Configure device structure for Counter */
> + dev->id = id;
> + dev->type = &counter_device_type;
> + dev->bus = &counter_bus_type;
> + if (counter->parent) {
> + dev->parent = counter->parent;
> + dev->of_node = counter->parent->of_node;
> + }
> + device_initialize(dev);
> + dev_set_drvdata(dev, counter);
> +
> + /* Add Counter sysfs attributes */
> + err = counter_sysfs_add(counter);
> + if (err < 0)
> + goto err_free_id;
> +
> + /* Add device to system */
> + err = device_add(dev);
> + if (err < 0)
> + goto err_free_id;
> +
> + return 0;
> +
> +err_free_id:
> + put_device(dev);
> + return err;
> +}
> +EXPORT_SYMBOL_GPL(counter_register);
> +
> +/**
> + * counter_unregister - unregister Counter from the system
> + * @counter: pointer to Counter to unregister
> + *
> + * The Counter is unregistered from the system.
> + */
> +void counter_unregister(struct counter_device *const counter)
> +{
> + if (!counter)
> + return;
> +
> + device_unregister(&counter->dev);
> +}
> +EXPORT_SYMBOL_GPL(counter_unregister);
> +
> +static void devm_counter_release(void *counter)
> +{
> + counter_unregister(counter);
> +}
> +
> +/**
> + * devm_counter_register - Resource-managed counter_register
> + * @dev: device to allocate counter_device for
> + * @counter: pointer to Counter to register
> + *
> + * Managed counter_register. The Counter registered with this function is
> + * automatically unregistered on driver detach. This function calls
> + * counter_register internally. Refer to that function for more information.
> + *
> + * RETURNS:
> + * 0 on success, negative error number on failure.
> + */
> +int devm_counter_register(struct device *dev,
> + struct counter_device *const counter)
> +{
> + int err;
> +
> + err = counter_register(counter);
> + if (err < 0)
> + return err;
> +
> + return devm_add_action_or_reset(dev, devm_counter_release, counter);
> +}
> +EXPORT_SYMBOL_GPL(devm_counter_register);
> +
> +static int __init counter_init(void)
> +{
> + return bus_register(&counter_bus_type);
> +}
> +
> +static void __exit counter_exit(void)
> +{
> + bus_unregister(&counter_bus_type);
> +}
> +
> +subsys_initcall(counter_init);
> +module_exit(counter_exit);
> +
> +MODULE_AUTHOR("William Breathitt Gray <[email protected]>");
> +MODULE_DESCRIPTION("Generic Counter interface");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/counter/counter-sysfs.c b/drivers/counter/counter-sysfs.c
> new file mode 100644
> index 000000000000..07588130600a
> --- /dev/null
> +++ b/drivers/counter/counter-sysfs.c
> @@ -0,0 +1,846 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Generic Counter sysfs interface
> + * Copyright (C) 2020 William Breathitt Gray
> + */
> +#include <linux/counter.h>
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/gfp.h>
> +#include <linux/kernel.h>
> +#include <linux/list.h>
> +#include <linux/string.h>
> +#include <linux/sysfs.h>
> +#include <linux/types.h>
> +
> +#include "counter-sysfs.h"
> +
> +/**
> + * struct counter_attribute - Counter sysfs attribute
> + * @dev_attr: device attribute for sysfs
> + * @l: node to add Counter attribute to attribute group list
> + * @comp: Counter component callbacks and data
> + * @scope: Counter scope of the attribute
> + * @parent: pointer to the parent component
> + */
> +struct counter_attribute {
> + struct device_attribute dev_attr;
> + struct list_head l;
> +
> + struct counter_comp comp;
> + enum counter_scope scope;
> + void *parent;
> +};
> +
> +#define to_counter_attribute(_dev_attr) \
> + container_of(_dev_attr, struct counter_attribute, dev_attr)
> +
> +/**
> + * struct counter_attribute_group - container for attribute group
> + * @name: name of the attribute group
> + * @attr_list: list to keep track of created attributes
> + * @num_attr: number of attributes
> + */
> +struct counter_attribute_group {
> + const char *name;
> + struct list_head attr_list;
> + size_t num_attr;
> +};
> +
> +static const char *const counter_function_str[] = {
> + [COUNTER_FUNCTION_INCREASE] = "increase",
> + [COUNTER_FUNCTION_DECREASE] = "decrease",
> + [COUNTER_FUNCTION_PULSE_DIRECTION] = "pulse-direction",
> + [COUNTER_FUNCTION_QUADRATURE_X1_A] = "quadrature x1 a",
> + [COUNTER_FUNCTION_QUADRATURE_X1_B] = "quadrature x1 b",
> + [COUNTER_FUNCTION_QUADRATURE_X2_A] = "quadrature x2 a",
> + [COUNTER_FUNCTION_QUADRATURE_X2_B] = "quadrature x2 b",
> + [COUNTER_FUNCTION_QUADRATURE_X4] = "quadrature x4"
> +};
> +
> +static const char *const counter_signal_value_str[] = {
> + [COUNTER_SIGNAL_LEVEL_LOW] = "low",
> + [COUNTER_SIGNAL_LEVEL_HIGH] = "high"
> +};
> +
> +static const char *const counter_synapse_action_str[] = {
> + [COUNTER_SYNAPSE_ACTION_NONE] = "none",
> + [COUNTER_SYNAPSE_ACTION_RISING_EDGE] = "rising edge",
> + [COUNTER_SYNAPSE_ACTION_FALLING_EDGE] = "falling edge",
> + [COUNTER_SYNAPSE_ACTION_BOTH_EDGES] = "both edges"
> +};
> +
> +static const char *const counter_count_direction_str[] = {
> + [COUNTER_COUNT_DIRECTION_FORWARD] = "forward",
> + [COUNTER_COUNT_DIRECTION_BACKWARD] = "backward"
> +};
> +
> +static const char *const counter_count_mode_str[] = {
> + [COUNTER_COUNT_MODE_NORMAL] = "normal",
> + [COUNTER_COUNT_MODE_RANGE_LIMIT] = "range limit",
> + [COUNTER_COUNT_MODE_NON_RECYCLE] = "non-recycle",
> + [COUNTER_COUNT_MODE_MODULO_N] = "modulo-n"
> +};
> +
> +static ssize_t counter_comp_u8_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + struct counter_device *const counter = dev_get_drvdata(dev);
> + int err;
> + u8 data = 0;
> +
> + switch (a->scope) {
> + case COUNTER_SCOPE_DEVICE:
> + err = a->comp.device_u8_read(counter, &data);
> + break;
> + case COUNTER_SCOPE_SIGNAL:
> + err = a->comp.signal_u8_read(counter, a->parent, &data);
> + break;
> + case COUNTER_SCOPE_COUNT:
> + err = a->comp.count_u8_read(counter, a->parent, &data);
> + break;
> + default:
> + return -EINVAL;
> + }
> + if (err < 0)
> + return err;
> +
> + if (a->comp.type == COUNTER_COMP_BOOL)
> + data = !!data;
> +
> + return sprintf(buf, "%u\n", (unsigned int)data);
> +}
> +
> +static ssize_t counter_comp_u8_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t len)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + struct counter_device *const counter = dev_get_drvdata(dev);
> + int err;
> + bool bool_data = 0;
> + u8 data = 0;
> +
> + if (a->comp.type == COUNTER_COMP_BOOL) {
> + err = kstrtobool(buf, &bool_data);
> + data = bool_data;
> + } else
> + err = kstrtou8(buf, 0, &data);
> + if (err < 0)
> + return err;
> +
> + switch (a->scope) {
> + case COUNTER_SCOPE_DEVICE:
> + err = a->comp.device_u8_write(counter, data);
> + break;
> + case COUNTER_SCOPE_SIGNAL:
> + err = a->comp.signal_u8_write(counter, a->parent, data);
> + break;
> + case COUNTER_SCOPE_COUNT:
> + err = a->comp.count_u8_write(counter, a->parent, data);
> + break;
> + default:
> + return -EINVAL;
> + }
> + if (err < 0)
> + return err;
> +
> + return len;
> +}
> +
> +static ssize_t counter_comp_u32_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + struct counter_device *const counter = dev_get_drvdata(dev);
> + const struct counter_available *const avail = a->comp.priv;
> + int err;
> + u32 data = 0;
> +
> + switch (a->scope) {
> + case COUNTER_SCOPE_DEVICE:
> + err = a->comp.device_u32_read(counter, &data);
> + break;
> + case COUNTER_SCOPE_SIGNAL:
> + err = a->comp.signal_u32_read(counter, a->parent, &data);
> + break;
> + case COUNTER_SCOPE_COUNT:
> + if (a->comp.type == COUNTER_COMP_SYNAPSE_ACTION)
> + err = a->comp.action_read(counter, a->parent,
> + a->comp.priv, &data);
> + else
> + err = a->comp.count_u32_read(counter, a->parent, &data);
> + break;
> + default:
> + return -EINVAL;
> + }
> + if (err < 0)
> + return err;
> +
> + switch (a->comp.type) {
> + case COUNTER_COMP_FUNCTION:
> + return sysfs_emit(buf, "%s\n", counter_function_str[data]);
> + case COUNTER_COMP_SIGNAL_LEVEL:
> + return sysfs_emit(buf, "%s\n", counter_signal_value_str[data]);
> + case COUNTER_COMP_SYNAPSE_ACTION:
> + return sysfs_emit(buf, "%s\n", counter_synapse_action_str[data]);
> + case COUNTER_COMP_ENUM:
> + return sysfs_emit(buf, "%s\n", avail->strs[data]);
> + case COUNTER_COMP_COUNT_DIRECTION:
> + return sysfs_emit(buf, "%s\n", counter_count_direction_str[data]);
> + case COUNTER_COMP_COUNT_MODE:
> + return sysfs_emit(buf, "%s\n", counter_count_mode_str[data]);
> + default:
> + return sprintf(buf, "%u\n", (unsigned int)data);
> + }
> +}
> +
> +static int counter_find_enum(u32 *const enum_item, const u32 *const enums,
> + const size_t num_enums, const char *const buf,
> + const char *const string_array[])
> +{
> + size_t index;
> +
> + for (index = 0; index < num_enums; index++) {
> + *enum_item = enums[index];
> + if (sysfs_streq(buf, string_array[*enum_item]))
> + return 0;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static ssize_t counter_comp_u32_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t len)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + struct counter_device *const counter = dev_get_drvdata(dev);
> + struct counter_count *const count = a->parent;
> + struct counter_synapse *const synapse = a->comp.priv;
> + const struct counter_available *const avail = a->comp.priv;
> + int err;
> + u32 data = 0;
> +
> + switch (a->comp.type) {
> + case COUNTER_COMP_FUNCTION:
> + err = counter_find_enum(&data, count->functions_list,
> + count->num_functions, buf,
> + counter_function_str);
> + break;
> + case COUNTER_COMP_SYNAPSE_ACTION:
> + err = counter_find_enum(&data, synapse->actions_list,
> + synapse->num_actions, buf,
> + counter_synapse_action_str);
> + break;
> + case COUNTER_COMP_ENUM:
> + err = __sysfs_match_string(avail->strs, avail->num_items, buf);
> + data = err;
> + break;
> + case COUNTER_COMP_COUNT_MODE:
> + err = counter_find_enum(&data, avail->enums, avail->num_items,
> + buf, counter_count_mode_str);
> + break;
> + default:
> + err = kstrtou32(buf, 0, &data);
> + break;
> + }
> + if (err < 0)
> + return err;
> +
> + switch (a->scope) {
> + case COUNTER_SCOPE_DEVICE:
> + err = a->comp.device_u32_write(counter, data);
> + break;
> + case COUNTER_SCOPE_SIGNAL:
> + err = a->comp.signal_u32_write(counter, a->parent, data);
> + break;
> + case COUNTER_SCOPE_COUNT:
> + if (a->comp.type == COUNTER_COMP_SYNAPSE_ACTION)
> + err = a->comp.action_write(counter, count, synapse,
> + data);
> + else
> + err = a->comp.count_u32_write(counter, count, data);
> + break;
> + default:
> + return -EINVAL;
> + }
> + if (err < 0)
> + return err;
> +
> + return len;
> +}
> +
> +static ssize_t counter_comp_u64_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + struct counter_device *const counter = dev_get_drvdata(dev);
> + int err;
> + u64 data = 0;
> +
> + switch (a->scope) {
> + case COUNTER_SCOPE_DEVICE:
> + err = a->comp.device_u64_read(counter, &data);
> + break;
> + case COUNTER_SCOPE_SIGNAL:
> + err = a->comp.signal_u64_read(counter, a->parent, &data);
> + break;
> + case COUNTER_SCOPE_COUNT:
> + err = a->comp.count_u64_read(counter, a->parent, &data);
> + break;
> + default:
> + return -EINVAL;
> + }
> + if (err < 0)
> + return err;
> +
> + return sprintf(buf, "%llu\n", (unsigned long long)data);
> +}
> +
> +static ssize_t counter_comp_u64_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t len)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + struct counter_device *const counter = dev_get_drvdata(dev);
> + int err;
> + u64 data = 0;
> +
> + err = kstrtou64(buf, 0, &data);
> + if (err < 0)
> + return err;
> +
> + switch (a->scope) {
> + case COUNTER_SCOPE_DEVICE:
> + err = a->comp.device_u64_write(counter, data);
> + break;
> + case COUNTER_SCOPE_SIGNAL:
> + err = a->comp.signal_u64_write(counter, a->parent, data);
> + break;
> + case COUNTER_SCOPE_COUNT:
> + err = a->comp.count_u64_write(counter, a->parent, data);
> + break;
> + default:
> + return -EINVAL;
> + }
> + if (err < 0)
> + return err;
> +
> + return len;
> +}
> +
> +static ssize_t enums_available_show(const u32 *const enums,
> + const size_t num_enums,
> + const char *const strs[], char *buf)
> +{
> + size_t len = 0;
> + size_t index;
> +
> + for (index = 0; index < num_enums; index++)
> + len += sysfs_emit_at(buf, len, "%s\n", strs[enums[index]]);
> +
> + return len;
> +}
> +
> +static ssize_t strs_available_show(const struct counter_available *const avail,
> + char *buf)
> +{
> + size_t len = 0;
> + size_t index;
> +
> + for (index = 0; index < avail->num_items; index++)
> + len += sysfs_emit_at(buf, len, "%s\n", avail->strs[index]);
> +
> + return len;
> +}
> +
> +static ssize_t counter_comp_available_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + const struct counter_count *const count = a->parent;
> + const struct counter_synapse *const synapse = a->comp.priv;
> + const struct counter_available *const avail = a->comp.priv;
> +
> + switch (a->comp.type) {
> + case COUNTER_COMP_FUNCTION:
> + return enums_available_show(count->functions_list,
> + count->num_functions,
> + counter_function_str, buf);
> + case COUNTER_COMP_SYNAPSE_ACTION:
> + return enums_available_show(synapse->actions_list,
> + synapse->num_actions,
> + counter_synapse_action_str, buf);
> + case COUNTER_COMP_ENUM:
> + return strs_available_show(avail, buf);
> + case COUNTER_COMP_COUNT_MODE:
> + return enums_available_show(avail->enums, avail->num_items,
> + counter_count_mode_str, buf);
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int counter_avail_attr_create(struct device *const dev,
> + struct counter_attribute_group *const group,
> + const struct counter_comp *const comp, void *const parent)
> +{
> + struct counter_attribute *counter_attr;
> + struct device_attribute *dev_attr;
> +
> + /* Allocate Counter attribute */
> + counter_attr = devm_kzalloc(dev, sizeof(*counter_attr), GFP_KERNEL);
> + if (!counter_attr)
> + return -ENOMEM;
> +
> + /* Configure Counter attribute */
> + counter_attr->comp.type = comp->type;
> + counter_attr->comp.priv = comp->priv;
> + counter_attr->parent = parent;
> +
> + /* Initialize sysfs attribute */
> + dev_attr = &counter_attr->dev_attr;
> + sysfs_attr_init(&dev_attr->attr);
> +
> + /* Configure device attribute */
> + dev_attr->attr.name = devm_kasprintf(dev, GFP_KERNEL, "%s_available",
> + comp->name);
> + if (!dev_attr->attr.name)
> + return -ENOMEM;
> + dev_attr->attr.mode = 0444;
> + dev_attr->show = counter_comp_available_show;
> +
> + /* Store list node */
> + list_add(&counter_attr->l, &group->attr_list);
> + group->num_attr++;
> +
> + return 0;
> +}
> +
> +static int counter_attr_create(struct device *const dev,
> + struct counter_attribute_group *const group,
> + const struct counter_comp *const comp,
> + const enum counter_scope scope,
> + void *const parent)
> +{
> + struct counter_attribute *counter_attr;
> + struct device_attribute *dev_attr;
> +
> + /* Allocate Counter attribute */
> + counter_attr = devm_kzalloc(dev, sizeof(*counter_attr), GFP_KERNEL);
> + if (!counter_attr)
> + return -ENOMEM;
> +
> + /* Configure Counter attribute */
> + counter_attr->comp = *comp;
> + counter_attr->scope = scope;
> + counter_attr->parent = parent;
> +
> + /* Configure device attribute */
> + dev_attr = &counter_attr->dev_attr;
> + sysfs_attr_init(&dev_attr->attr);
> + dev_attr->attr.name = comp->name;
> + switch (comp->type) {
> + case COUNTER_COMP_U8:
> + case COUNTER_COMP_BOOL:
> + if (comp->device_u8_read) {
> + dev_attr->attr.mode |= 0444;
> + dev_attr->show = counter_comp_u8_show;
> + }
> + if (comp->device_u8_write) {
> + dev_attr->attr.mode |= 0200;
> + dev_attr->store = counter_comp_u8_store;
> + }
> + break;
> + case COUNTER_COMP_SIGNAL_LEVEL:
> + case COUNTER_COMP_FUNCTION:
> + case COUNTER_COMP_SYNAPSE_ACTION:
> + case COUNTER_COMP_ENUM:
> + case COUNTER_COMP_COUNT_DIRECTION:
> + case COUNTER_COMP_COUNT_MODE:
> + if (comp->device_u32_read) {
> + dev_attr->attr.mode |= 0444;
> + dev_attr->show = counter_comp_u32_show;
> + }
> + if (comp->device_u32_write) {
> + dev_attr->attr.mode |= 0200;
> + dev_attr->store = counter_comp_u32_store;
> + }
> + break;
> + case COUNTER_COMP_U64:
> + if (comp->device_u64_read) {
> + dev_attr->attr.mode |= 0444;
> + dev_attr->show = counter_comp_u64_show;
> + }
> + if (comp->device_u64_write) {
> + dev_attr->attr.mode |= 0200;
> + dev_attr->store = counter_comp_u64_store;
> + }
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + /* Store list node */
> + list_add(&counter_attr->l, &group->attr_list);
> + group->num_attr++;
> +
> + /* Create "*_available" attribute if needed */
> + switch (comp->type) {
> + case COUNTER_COMP_FUNCTION:
> + case COUNTER_COMP_SYNAPSE_ACTION:
> + case COUNTER_COMP_ENUM:
> + case COUNTER_COMP_COUNT_MODE:
> + return counter_avail_attr_create(dev, group, comp, parent);
> + default:
> + return 0;
> + }
> +}
> +
> +static ssize_t counter_comp_name_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + return sysfs_emit(buf, "%s\n", to_counter_attribute(attr)->comp.name);
> +}
> +
> +static int counter_name_attr_create(struct device *const dev,
> + struct counter_attribute_group *const group,
> + const char *const name)
> +{
> + struct counter_attribute *counter_attr;
> +
> + /* Allocate Counter attribute */
> + counter_attr = devm_kzalloc(dev, sizeof(*counter_attr), GFP_KERNEL);
> + if (!counter_attr)
> + return -ENOMEM;
> +
> + /* Configure Counter attribute */
> + counter_attr->comp.name = name;
> +
> + /* Configure device attribute */
> + sysfs_attr_init(&counter_attr->dev_attr.attr);
> + counter_attr->dev_attr.attr.name = "name";
> + counter_attr->dev_attr.attr.mode = 0444;
> + counter_attr->dev_attr.show = counter_comp_name_show;
> +
> + /* Store list node */
> + list_add(&counter_attr->l, &group->attr_list);
> + group->num_attr++;
> +
> + return 0;
> +}
> +
> +static struct counter_comp counter_signal_comp = {
> + .type = COUNTER_COMP_SIGNAL_LEVEL,
> + .name = "signal",
> +};
> +
> +static int counter_signal_attrs_create(struct counter_device *const counter,
> + struct counter_attribute_group *const group,
> + struct counter_signal *const signal)
> +{
> + const enum counter_scope scope = COUNTER_SCOPE_SIGNAL;
> + struct device *const dev = &counter->dev;
> + int err;
> + struct counter_comp comp;
> + size_t i;
> +
> + /* Create main Signal attribute */
> + comp = counter_signal_comp;
> + comp.signal_u32_read = counter->ops->signal_read;
> + err = counter_attr_create(dev, group, &comp, scope, signal);
> + if (err < 0)
> + return err;
> +
> + /* Create Signal name attribute */
> + err = counter_name_attr_create(dev, group, signal->name);
> + if (err < 0)
> + return err;
> +
> + /* Create an attribute for each extension */
> + for (i = 0; i < signal->num_ext; i++) {
> + err = counter_attr_create(dev, group, signal->ext + i, scope,
> + signal);
> + if (err < 0)
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static int counter_sysfs_signals_add(struct counter_device *const counter,
> + struct counter_attribute_group *const groups)
> +{
> + size_t i;
> + int err;
> +
> + /* Add each Signal */
> + for (i = 0; i < counter->num_signals; i++) {
> + /* Generate Signal attribute directory name */
> + groups[i].name = devm_kasprintf(&counter->dev, GFP_KERNEL,
> + "signal%zu", i);
> + if (!groups[i].name)
> + return -ENOMEM;
> +
> + /* Create all attributes associated with Signal */
> + err = counter_signal_attrs_create(counter, groups + i,
> + counter->signals + i);
> + if (err < 0)
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static int counter_sysfs_synapses_add(struct counter_device *const counter,
> + struct counter_attribute_group *const group,
> + struct counter_count *const count)
> +{
> + size_t i;
> +
> + /* Add each Synapse */
> + for (i = 0; i < count->num_synapses; i++) {
> + struct device *const dev = &counter->dev;
> + struct counter_synapse *synapse;
> + size_t id;
> + struct counter_comp comp;
> + int err;
> +
> + synapse = count->synapses + i;
> +
> + /* Generate Synapse action name */
> + id = synapse->signal - counter->signals;
> + comp.name = devm_kasprintf(dev, GFP_KERNEL, "signal%zu_action",
> + id);
> + if (!comp.name)
> + return -ENOMEM;
> +
> + /* Create action attribute */
> + comp.type = COUNTER_COMP_SYNAPSE_ACTION;
> + comp.action_read = counter->ops->action_read;
> + comp.action_write = counter->ops->action_write;
> + comp.priv = synapse;
> + err = counter_attr_create(dev, group, &comp,
> + COUNTER_SCOPE_COUNT, count);
> + if (err < 0)
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static struct counter_comp counter_count_comp =
> + COUNTER_COMP_COUNT_U64("count", NULL, NULL);
> +
> +static struct counter_comp counter_function_comp = {
> + .type = COUNTER_COMP_FUNCTION,
> + .name = "function",
> +};
> +
> +static int counter_count_attrs_create(struct counter_device *const counter,
> + struct counter_attribute_group *const group,
> + struct counter_count *const count)
> +{
> + const enum counter_scope scope = COUNTER_SCOPE_COUNT;
> + struct device *const dev = &counter->dev;
> + int err;
> + struct counter_comp comp;
> + size_t i;
> +
> + /* Create main Count attribute */
> + comp = counter_count_comp;
> + comp.count_u64_read = counter->ops->count_read;
> + comp.count_u64_write = counter->ops->count_write;
> + err = counter_attr_create(dev, group, &comp, scope, count);
> + if (err < 0)
> + return err;
> +
> + /* Create Count name attribute */
> + err = counter_name_attr_create(dev, group, count->name);
> + if (err < 0)
> + return err;
> +
> + /* Create Count function attribute */
> + comp = counter_function_comp;
> + comp.count_u32_read = counter->ops->function_read;
> + comp.count_u32_write = counter->ops->function_write;
> + err = counter_attr_create(dev, group, &comp, scope, count);
> + if (err < 0)
> + return err;
> +
> + /* Create an attribute for each extension */
> + for (i = 0; i < count->num_ext; i++) {
> + err = counter_attr_create(dev, group, count->ext + i, scope,
> + count);
> + if (err < 0)
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static int counter_sysfs_counts_add(struct counter_device *const counter,
> + struct counter_attribute_group *const groups)
> +{
> + size_t i;
> + struct counter_count *count;
> + int err;
> +
> + /* Add each Count */
> + for (i = 0; i < counter->num_counts; i++) {
> + count = counter->counts + i;
> +
> + /* Generate Count attribute directory name */
> + groups[i].name = devm_kasprintf(&counter->dev, GFP_KERNEL,
> + "count%zu", i);
> + if (!groups[i].name)
> + return -ENOMEM;
> +
> + /* Add sysfs attributes of the Synapses */
> + err = counter_sysfs_synapses_add(counter, groups + i, count);
> + if (err < 0)
> + return err;
> +
> + /* Create all attributes associated with Count */
> + err = counter_count_attrs_create(counter, groups + i, count);
> + if (err < 0)
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static int counter_num_signals_read(struct counter_device *counter, u8 *val)
> +{
> + *val = counter->num_signals;
> + return 0;
> +}
> +
> +static int counter_num_counts_read(struct counter_device *counter, u8 *val)
> +{
> + *val = counter->num_counts;
> + return 0;
> +}
> +
> +static struct counter_comp counter_num_signals_comp =
> + COUNTER_COMP_DEVICE_U8("num_signals", counter_num_signals_read, NULL);
> +
> +static struct counter_comp counter_num_counts_comp =
> + COUNTER_COMP_DEVICE_U8("num_counts", counter_num_counts_read, NULL);
> +
> +static int counter_sysfs_attr_add(struct counter_device *const counter,
> + struct counter_attribute_group *group)
> +{
> + const enum counter_scope scope = COUNTER_SCOPE_DEVICE;
> + struct device *const dev = &counter->dev;
> + int err;
> + size_t i;
> +
> + /* Add Signals sysfs attributes */
> + err = counter_sysfs_signals_add(counter, group);
> + if (err < 0)
> + return err;
> + group += counter->num_signals;
> +
> + /* Add Counts sysfs attributes */
> + err = counter_sysfs_counts_add(counter, group);
> + if (err < 0)
> + return err;
> + group += counter->num_counts;
> +
> + /* Create name attribute */
> + err = counter_name_attr_create(dev, group, counter->name);
> + if (err < 0)
> + return err;
> +
> + /* Create num_signals attribute */
> + err = counter_attr_create(dev, group, &counter_num_signals_comp, scope,
> + NULL);
> + if (err < 0)
> + return err;
> +
> + /* Create num_counts attribute */
> + err = counter_attr_create(dev, group, &counter_num_counts_comp, scope,
> + NULL);
> + if (err < 0)
> + return err;
> +
> + /* Create an attribute for each extension */
> + for (i = 0; i < counter->num_ext; i++) {
> + err = counter_attr_create(dev, group, counter->ext + i, scope,
> + NULL);
> + if (err < 0)
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +/**
> + * counter_sysfs_add - Adds Counter sysfs attributes to the device structure
> + * @counter: Pointer to the Counter device structure
> + *
> + * Counter sysfs attributes are created and added to the respective device
> + * structure for later registration to the system. Resource-managed memory
> + * allocation is performed by this function, and this memory should be freed
> + * when no longer needed (automatically by a device_unregister call, or
> + * manually by a devres_release_all call).
> + */
> +int counter_sysfs_add(struct counter_device *const counter)
> +{
> + struct device *const dev = &counter->dev;
> + const size_t num_groups = counter->num_signals + counter->num_counts + 1;
> + struct counter_attribute_group *groups;
> + size_t i, j;
> + int err;
> + struct attribute_group *group;
> + struct counter_attribute *p;
> +
> + /* Allocate space for attribute groups (signals, counts, and ext) */
> + groups = devm_kcalloc(dev, num_groups, sizeof(*groups), GFP_KERNEL);
> + if (!groups)
> + return -ENOMEM;
> +
> + /* Initialize attribute lists */
> + for (i = 0; i < num_groups; i++)
> + INIT_LIST_HEAD(&groups[i].attr_list);
> +
> + /* Add Counter device sysfs attributes */
> + err = counter_sysfs_attr_add(counter, groups);
> + if (err < 0)
> + return err;
> +
> + /* Allocate attribute groups for association with device */
> + dev->groups = devm_kcalloc(dev, num_groups + 1, sizeof(*dev->groups),
> + GFP_KERNEL);
> + if (!dev->groups)
> + return -ENOMEM;
> +
> + /* Prepare each group of attributes for association */
> + for (i = 0; i < num_groups; i++) {
> + /* Allocate space for attribute group */
> + group = devm_kzalloc(dev, sizeof(*group), GFP_KERNEL);
> + if (!group)
> + return -ENOMEM;
> + group->name = groups[i].name;
> +
> + /* Allocate space for attribute pointers */
> + group->attrs = devm_kcalloc(dev, groups[i].num_attr + 1,
> + sizeof(*group->attrs), GFP_KERNEL);
> + if (!group->attrs)
> + return -ENOMEM;
> +
> + /* Add attribute pointers to attribute group */
> + j = 0;
> + list_for_each_entry(p, &groups[i].attr_list, l)
> + group->attrs[j++] = &p->dev_attr.attr;
> +
> + /* Associate attribute group */
> + dev->groups[i] = group;
> + }
> +
> + return 0;
> +}
> diff --git a/drivers/counter/counter-sysfs.h b/drivers/counter/counter-sysfs.h
> new file mode 100644
> index 000000000000..14fe566aca0e
> --- /dev/null
> +++ b/drivers/counter/counter-sysfs.h
> @@ -0,0 +1,13 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Counter sysfs interface
> + * Copyright (C) 2020 William Breathitt Gray
> + */
> +#ifndef _COUNTER_SYSFS_H_
> +#define _COUNTER_SYSFS_H_
> +
> +#include <linux/counter.h>
> +
> +int counter_sysfs_add(struct counter_device *const counter);
> +
> +#endif /* _COUNTER_SYSFS_H_ */
> diff --git a/drivers/counter/counter.c b/drivers/counter/counter.c
> deleted file mode 100644
> index de921e8a3f72..000000000000
> --- a/drivers/counter/counter.c
> +++ /dev/null
> @@ -1,1496 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0
> -/*
> - * Generic Counter interface
> - * Copyright (C) 2018 William Breathitt Gray
> - */
> -#include <linux/counter.h>
> -#include <linux/device.h>
> -#include <linux/err.h>
> -#include <linux/export.h>
> -#include <linux/fs.h>
> -#include <linux/gfp.h>
> -#include <linux/idr.h>
> -#include <linux/init.h>
> -#include <linux/kernel.h>
> -#include <linux/list.h>
> -#include <linux/module.h>
> -#include <linux/printk.h>
> -#include <linux/slab.h>
> -#include <linux/string.h>
> -#include <linux/sysfs.h>
> -#include <linux/types.h>
> -
> -const char *const counter_count_direction_str[2] = {
> - [COUNTER_COUNT_DIRECTION_FORWARD] = "forward",
> - [COUNTER_COUNT_DIRECTION_BACKWARD] = "backward"
> -};
> -EXPORT_SYMBOL_GPL(counter_count_direction_str);
> -
> -const char *const counter_count_mode_str[4] = {
> - [COUNTER_COUNT_MODE_NORMAL] = "normal",
> - [COUNTER_COUNT_MODE_RANGE_LIMIT] = "range limit",
> - [COUNTER_COUNT_MODE_NON_RECYCLE] = "non-recycle",
> - [COUNTER_COUNT_MODE_MODULO_N] = "modulo-n"
> -};
> -EXPORT_SYMBOL_GPL(counter_count_mode_str);
> -
> -ssize_t counter_signal_enum_read(struct counter_device *counter,
> - struct counter_signal *signal, void *priv,
> - char *buf)
> -{
> - const struct counter_signal_enum_ext *const e = priv;
> - int err;
> - size_t index;
> -
> - if (!e->get)
> - return -EINVAL;
> -
> - err = e->get(counter, signal, &index);
> - if (err)
> - return err;
> -
> - if (index >= e->num_items)
> - return -EINVAL;
> -
> - return sprintf(buf, "%s\n", e->items[index]);
> -}
> -EXPORT_SYMBOL_GPL(counter_signal_enum_read);
> -
> -ssize_t counter_signal_enum_write(struct counter_device *counter,
> - struct counter_signal *signal, void *priv,
> - const char *buf, size_t len)
> -{
> - const struct counter_signal_enum_ext *const e = priv;
> - ssize_t index;
> - int err;
> -
> - if (!e->set)
> - return -EINVAL;
> -
> - index = __sysfs_match_string(e->items, e->num_items, buf);
> - if (index < 0)
> - return index;
> -
> - err = e->set(counter, signal, index);
> - if (err)
> - return err;
> -
> - return len;
> -}
> -EXPORT_SYMBOL_GPL(counter_signal_enum_write);
> -
> -ssize_t counter_signal_enum_available_read(struct counter_device *counter,
> - struct counter_signal *signal,
> - void *priv, char *buf)
> -{
> - const struct counter_signal_enum_ext *const e = priv;
> - size_t i;
> - size_t len = 0;
> -
> - if (!e->num_items)
> - return 0;
> -
> - for (i = 0; i < e->num_items; i++)
> - len += sprintf(buf + len, "%s\n", e->items[i]);
> -
> - return len;
> -}
> -EXPORT_SYMBOL_GPL(counter_signal_enum_available_read);
> -
> -ssize_t counter_count_enum_read(struct counter_device *counter,
> - struct counter_count *count, void *priv,
> - char *buf)
> -{
> - const struct counter_count_enum_ext *const e = priv;
> - int err;
> - size_t index;
> -
> - if (!e->get)
> - return -EINVAL;
> -
> - err = e->get(counter, count, &index);
> - if (err)
> - return err;
> -
> - if (index >= e->num_items)
> - return -EINVAL;
> -
> - return sprintf(buf, "%s\n", e->items[index]);
> -}
> -EXPORT_SYMBOL_GPL(counter_count_enum_read);
> -
> -ssize_t counter_count_enum_write(struct counter_device *counter,
> - struct counter_count *count, void *priv,
> - const char *buf, size_t len)
> -{
> - const struct counter_count_enum_ext *const e = priv;
> - ssize_t index;
> - int err;
> -
> - if (!e->set)
> - return -EINVAL;
> -
> - index = __sysfs_match_string(e->items, e->num_items, buf);
> - if (index < 0)
> - return index;
> -
> - err = e->set(counter, count, index);
> - if (err)
> - return err;
> -
> - return len;
> -}
> -EXPORT_SYMBOL_GPL(counter_count_enum_write);
> -
> -ssize_t counter_count_enum_available_read(struct counter_device *counter,
> - struct counter_count *count,
> - void *priv, char *buf)
> -{
> - const struct counter_count_enum_ext *const e = priv;
> - size_t i;
> - size_t len = 0;
> -
> - if (!e->num_items)
> - return 0;
> -
> - for (i = 0; i < e->num_items; i++)
> - len += sprintf(buf + len, "%s\n", e->items[i]);
> -
> - return len;
> -}
> -EXPORT_SYMBOL_GPL(counter_count_enum_available_read);
> -
> -ssize_t counter_device_enum_read(struct counter_device *counter, void *priv,
> - char *buf)
> -{
> - const struct counter_device_enum_ext *const e = priv;
> - int err;
> - size_t index;
> -
> - if (!e->get)
> - return -EINVAL;
> -
> - err = e->get(counter, &index);
> - if (err)
> - return err;
> -
> - if (index >= e->num_items)
> - return -EINVAL;
> -
> - return sprintf(buf, "%s\n", e->items[index]);
> -}
> -EXPORT_SYMBOL_GPL(counter_device_enum_read);
> -
> -ssize_t counter_device_enum_write(struct counter_device *counter, void *priv,
> - const char *buf, size_t len)
> -{
> - const struct counter_device_enum_ext *const e = priv;
> - ssize_t index;
> - int err;
> -
> - if (!e->set)
> - return -EINVAL;
> -
> - index = __sysfs_match_string(e->items, e->num_items, buf);
> - if (index < 0)
> - return index;
> -
> - err = e->set(counter, index);
> - if (err)
> - return err;
> -
> - return len;
> -}
> -EXPORT_SYMBOL_GPL(counter_device_enum_write);
> -
> -ssize_t counter_device_enum_available_read(struct counter_device *counter,
> - void *priv, char *buf)
> -{
> - const struct counter_device_enum_ext *const e = priv;
> - size_t i;
> - size_t len = 0;
> -
> - if (!e->num_items)
> - return 0;
> -
> - for (i = 0; i < e->num_items; i++)
> - len += sprintf(buf + len, "%s\n", e->items[i]);
> -
> - return len;
> -}
> -EXPORT_SYMBOL_GPL(counter_device_enum_available_read);
> -
> -struct counter_attr_parm {
> - struct counter_device_attr_group *group;
> - const char *prefix;
> - const char *name;
> - ssize_t (*show)(struct device *dev, struct device_attribute *attr,
> - char *buf);
> - ssize_t (*store)(struct device *dev, struct device_attribute *attr,
> - const char *buf, size_t len);
> - void *component;
> -};
> -
> -struct counter_device_attr {
> - struct device_attribute dev_attr;
> - struct list_head l;
> - void *component;
> -};
> -
> -static int counter_attribute_create(const struct counter_attr_parm *const parm)
> -{
> - struct counter_device_attr *counter_attr;
> - struct device_attribute *dev_attr;
> - int err;
> - struct list_head *const attr_list = &parm->group->attr_list;
> -
> - /* Allocate a Counter device attribute */
> - counter_attr = kzalloc(sizeof(*counter_attr), GFP_KERNEL);
> - if (!counter_attr)
> - return -ENOMEM;
> - dev_attr = &counter_attr->dev_attr;
> -
> - sysfs_attr_init(&dev_attr->attr);
> -
> - /* Configure device attribute */
> - dev_attr->attr.name = kasprintf(GFP_KERNEL, "%s%s", parm->prefix,
> - parm->name);
> - if (!dev_attr->attr.name) {
> - err = -ENOMEM;
> - goto err_free_counter_attr;
> - }
> - if (parm->show) {
> - dev_attr->attr.mode |= 0444;
> - dev_attr->show = parm->show;
> - }
> - if (parm->store) {
> - dev_attr->attr.mode |= 0200;
> - dev_attr->store = parm->store;
> - }
> -
> - /* Store associated Counter component with attribute */
> - counter_attr->component = parm->component;
> -
> - /* Keep track of the attribute for later cleanup */
> - list_add(&counter_attr->l, attr_list);
> - parm->group->num_attr++;
> -
> - return 0;
> -
> -err_free_counter_attr:
> - kfree(counter_attr);
> - return err;
> -}
> -
> -#define to_counter_attr(_dev_attr) \
> - container_of(_dev_attr, struct counter_device_attr, dev_attr)
> -
> -struct counter_signal_unit {
> - struct counter_signal *signal;
> -};
> -
> -static const char *const counter_signal_level_str[] = {
> - [COUNTER_SIGNAL_LEVEL_LOW] = "low",
> - [COUNTER_SIGNAL_LEVEL_HIGH] = "high"
> -};
> -
> -static ssize_t counter_signal_show(struct device *dev,
> - struct device_attribute *attr, char *buf)
> -{
> - struct counter_device *const counter = dev_get_drvdata(dev);
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_signal_unit *const component = devattr->component;
> - struct counter_signal *const signal = component->signal;
> - int err;
> - enum counter_signal_level level;
> -
> - err = counter->ops->signal_read(counter, signal, &level);
> - if (err)
> - return err;
> -
> - return sprintf(buf, "%s\n", counter_signal_level_str[level]);
> -}
> -
> -struct counter_name_unit {
> - const char *name;
> -};
> -
> -static ssize_t counter_device_attr_name_show(struct device *dev,
> - struct device_attribute *attr,
> - char *buf)
> -{
> - const struct counter_name_unit *const comp = to_counter_attr(attr)->component;
> -
> - return sprintf(buf, "%s\n", comp->name);
> -}
> -
> -static int counter_name_attribute_create(
> - struct counter_device_attr_group *const group,
> - const char *const name)
> -{
> - struct counter_name_unit *name_comp;
> - struct counter_attr_parm parm;
> - int err;
> -
> - /* Skip if no name */
> - if (!name)
> - return 0;
> -
> - /* Allocate name attribute component */
> - name_comp = kmalloc(sizeof(*name_comp), GFP_KERNEL);
> - if (!name_comp)
> - return -ENOMEM;
> - name_comp->name = name;
> -
> - /* Allocate Signal name attribute */
> - parm.group = group;
> - parm.prefix = "";
> - parm.name = "name";
> - parm.show = counter_device_attr_name_show;
> - parm.store = NULL;
> - parm.component = name_comp;
> - err = counter_attribute_create(&parm);
> - if (err)
> - goto err_free_name_comp;
> -
> - return 0;
> -
> -err_free_name_comp:
> - kfree(name_comp);
> - return err;
> -}
> -
> -struct counter_signal_ext_unit {
> - struct counter_signal *signal;
> - const struct counter_signal_ext *ext;
> -};
> -
> -static ssize_t counter_signal_ext_show(struct device *dev,
> - struct device_attribute *attr, char *buf)
> -{
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_signal_ext_unit *const comp = devattr->component;
> - const struct counter_signal_ext *const ext = comp->ext;
> -
> - return ext->read(dev_get_drvdata(dev), comp->signal, ext->priv, buf);
> -}
> -
> -static ssize_t counter_signal_ext_store(struct device *dev,
> - struct device_attribute *attr,
> - const char *buf, size_t len)
> -{
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_signal_ext_unit *const comp = devattr->component;
> - const struct counter_signal_ext *const ext = comp->ext;
> -
> - return ext->write(dev_get_drvdata(dev), comp->signal, ext->priv, buf,
> - len);
> -}
> -
> -static void counter_device_attr_list_free(struct list_head *attr_list)
> -{
> - struct counter_device_attr *p, *n;
> -
> - list_for_each_entry_safe(p, n, attr_list, l) {
> - /* free attribute name and associated component memory */
> - kfree(p->dev_attr.attr.name);
> - kfree(p->component);
> - list_del(&p->l);
> - kfree(p);
> - }
> -}
> -
> -static int counter_signal_ext_register(
> - struct counter_device_attr_group *const group,
> - struct counter_signal *const signal)
> -{
> - const size_t num_ext = signal->num_ext;
> - size_t i;
> - const struct counter_signal_ext *ext;
> - struct counter_signal_ext_unit *signal_ext_comp;
> - struct counter_attr_parm parm;
> - int err;
> -
> - /* Create an attribute for each extension */
> - for (i = 0 ; i < num_ext; i++) {
> - ext = signal->ext + i;
> -
> - /* Allocate signal_ext attribute component */
> - signal_ext_comp = kmalloc(sizeof(*signal_ext_comp), GFP_KERNEL);
> - if (!signal_ext_comp) {
> - err = -ENOMEM;
> - goto err_free_attr_list;
> - }
> - signal_ext_comp->signal = signal;
> - signal_ext_comp->ext = ext;
> -
> - /* Allocate a Counter device attribute */
> - parm.group = group;
> - parm.prefix = "";
> - parm.name = ext->name;
> - parm.show = (ext->read) ? counter_signal_ext_show : NULL;
> - parm.store = (ext->write) ? counter_signal_ext_store : NULL;
> - parm.component = signal_ext_comp;
> - err = counter_attribute_create(&parm);
> - if (err) {
> - kfree(signal_ext_comp);
> - goto err_free_attr_list;
> - }
> - }
> -
> - return 0;
> -
> -err_free_attr_list:
> - counter_device_attr_list_free(&group->attr_list);
> - return err;
> -}
> -
> -static int counter_signal_attributes_create(
> - struct counter_device_attr_group *const group,
> - const struct counter_device *const counter,
> - struct counter_signal *const signal)
> -{
> - struct counter_signal_unit *signal_comp;
> - struct counter_attr_parm parm;
> - int err;
> -
> - /* Allocate Signal attribute component */
> - signal_comp = kmalloc(sizeof(*signal_comp), GFP_KERNEL);
> - if (!signal_comp)
> - return -ENOMEM;
> - signal_comp->signal = signal;
> -
> - /* Create main Signal attribute */
> - parm.group = group;
> - parm.prefix = "";
> - parm.name = "signal";
> - parm.show = (counter->ops->signal_read) ? counter_signal_show : NULL;
> - parm.store = NULL;
> - parm.component = signal_comp;
> - err = counter_attribute_create(&parm);
> - if (err) {
> - kfree(signal_comp);
> - return err;
> - }
> -
> - /* Create Signal name attribute */
> - err = counter_name_attribute_create(group, signal->name);
> - if (err)
> - goto err_free_attr_list;
> -
> - /* Register Signal extension attributes */
> - err = counter_signal_ext_register(group, signal);
> - if (err)
> - goto err_free_attr_list;
> -
> - return 0;
> -
> -err_free_attr_list:
> - counter_device_attr_list_free(&group->attr_list);
> - return err;
> -}
> -
> -static int counter_signals_register(
> - struct counter_device_attr_group *const groups_list,
> - const struct counter_device *const counter)
> -{
> - const size_t num_signals = counter->num_signals;
> - size_t i;
> - struct counter_signal *signal;
> - const char *name;
> - int err;
> -
> - /* Register each Signal */
> - for (i = 0; i < num_signals; i++) {
> - signal = counter->signals + i;
> -
> - /* Generate Signal attribute directory name */
> - name = kasprintf(GFP_KERNEL, "signal%d", signal->id);
> - if (!name) {
> - err = -ENOMEM;
> - goto err_free_attr_groups;
> - }
> - groups_list[i].attr_group.name = name;
> -
> - /* Create all attributes associated with Signal */
> - err = counter_signal_attributes_create(groups_list + i, counter,
> - signal);
> - if (err)
> - goto err_free_attr_groups;
> - }
> -
> - return 0;
> -
> -err_free_attr_groups:
> - do {
> - kfree(groups_list[i].attr_group.name);
> - counter_device_attr_list_free(&groups_list[i].attr_list);
> - } while (i--);
> - return err;
> -}
> -
> -static const char *const counter_synapse_action_str[] = {
> - [COUNTER_SYNAPSE_ACTION_NONE] = "none",
> - [COUNTER_SYNAPSE_ACTION_RISING_EDGE] = "rising edge",
> - [COUNTER_SYNAPSE_ACTION_FALLING_EDGE] = "falling edge",
> - [COUNTER_SYNAPSE_ACTION_BOTH_EDGES] = "both edges"
> -};
> -
> -struct counter_action_unit {
> - struct counter_synapse *synapse;
> - struct counter_count *count;
> -};
> -
> -static ssize_t counter_action_show(struct device *dev,
> - struct device_attribute *attr, char *buf)
> -{
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - int err;
> - struct counter_device *const counter = dev_get_drvdata(dev);
> - const struct counter_action_unit *const component = devattr->component;
> - struct counter_count *const count = component->count;
> - struct counter_synapse *const synapse = component->synapse;
> - size_t action_index;
> - enum counter_synapse_action action;
> -
> - err = counter->ops->action_get(counter, count, synapse, &action_index);
> - if (err)
> - return err;
> -
> - synapse->action = action_index;
> -
> - action = synapse->actions_list[action_index];
> - return sprintf(buf, "%s\n", counter_synapse_action_str[action]);
> -}
> -
> -static ssize_t counter_action_store(struct device *dev,
> - struct device_attribute *attr,
> - const char *buf, size_t len)
> -{
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_action_unit *const component = devattr->component;
> - struct counter_synapse *const synapse = component->synapse;
> - size_t action_index;
> - const size_t num_actions = synapse->num_actions;
> - enum counter_synapse_action action;
> - int err;
> - struct counter_device *const counter = dev_get_drvdata(dev);
> - struct counter_count *const count = component->count;
> -
> - /* Find requested action mode */
> - for (action_index = 0; action_index < num_actions; action_index++) {
> - action = synapse->actions_list[action_index];
> - if (sysfs_streq(buf, counter_synapse_action_str[action]))
> - break;
> - }
> - /* If requested action mode not found */
> - if (action_index >= num_actions)
> - return -EINVAL;
> -
> - err = counter->ops->action_set(counter, count, synapse, action_index);
> - if (err)
> - return err;
> -
> - synapse->action = action_index;
> -
> - return len;
> -}
> -
> -struct counter_action_avail_unit {
> - const enum counter_synapse_action *actions_list;
> - size_t num_actions;
> -};
> -
> -static ssize_t counter_synapse_action_available_show(struct device *dev,
> - struct device_attribute *attr, char *buf)
> -{
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_action_avail_unit *const component = devattr->component;
> - size_t i;
> - enum counter_synapse_action action;
> - ssize_t len = 0;
> -
> - for (i = 0; i < component->num_actions; i++) {
> - action = component->actions_list[i];
> - len += sprintf(buf + len, "%s\n",
> - counter_synapse_action_str[action]);
> - }
> -
> - return len;
> -}
> -
> -static int counter_synapses_register(
> - struct counter_device_attr_group *const group,
> - const struct counter_device *const counter,
> - struct counter_count *const count, const char *const count_attr_name)
> -{
> - size_t i;
> - struct counter_synapse *synapse;
> - const char *prefix;
> - struct counter_action_unit *action_comp;
> - struct counter_attr_parm parm;
> - int err;
> - struct counter_action_avail_unit *avail_comp;
> -
> - /* Register each Synapse */
> - for (i = 0; i < count->num_synapses; i++) {
> - synapse = count->synapses + i;
> -
> - /* Generate attribute prefix */
> - prefix = kasprintf(GFP_KERNEL, "signal%d_",
> - synapse->signal->id);
> - if (!prefix) {
> - err = -ENOMEM;
> - goto err_free_attr_list;
> - }
> -
> - /* Allocate action attribute component */
> - action_comp = kmalloc(sizeof(*action_comp), GFP_KERNEL);
> - if (!action_comp) {
> - err = -ENOMEM;
> - goto err_free_prefix;
> - }
> - action_comp->synapse = synapse;
> - action_comp->count = count;
> -
> - /* Create action attribute */
> - parm.group = group;
> - parm.prefix = prefix;
> - parm.name = "action";
> - parm.show = (counter->ops->action_get) ? counter_action_show : NULL;
> - parm.store = (counter->ops->action_set) ? counter_action_store : NULL;
> - parm.component = action_comp;
> - err = counter_attribute_create(&parm);
> - if (err) {
> - kfree(action_comp);
> - goto err_free_prefix;
> - }
> -
> - /* Allocate action available attribute component */
> - avail_comp = kmalloc(sizeof(*avail_comp), GFP_KERNEL);
> - if (!avail_comp) {
> - err = -ENOMEM;
> - goto err_free_prefix;
> - }
> - avail_comp->actions_list = synapse->actions_list;
> - avail_comp->num_actions = synapse->num_actions;
> -
> - /* Create action_available attribute */
> - parm.group = group;
> - parm.prefix = prefix;
> - parm.name = "action_available";
> - parm.show = counter_synapse_action_available_show;
> - parm.store = NULL;
> - parm.component = avail_comp;
> - err = counter_attribute_create(&parm);
> - if (err) {
> - kfree(avail_comp);
> - goto err_free_prefix;
> - }
> -
> - kfree(prefix);
> - }
> -
> - return 0;
> -
> -err_free_prefix:
> - kfree(prefix);
> -err_free_attr_list:
> - counter_device_attr_list_free(&group->attr_list);
> - return err;
> -}
> -
> -struct counter_count_unit {
> - struct counter_count *count;
> -};
> -
> -static ssize_t counter_count_show(struct device *dev,
> - struct device_attribute *attr,
> - char *buf)
> -{
> - struct counter_device *const counter = dev_get_drvdata(dev);
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_count_unit *const component = devattr->component;
> - struct counter_count *const count = component->count;
> - int err;
> - unsigned long val;
> -
> - err = counter->ops->count_read(counter, count, &val);
> - if (err)
> - return err;
> -
> - return sprintf(buf, "%lu\n", val);
> -}
> -
> -static ssize_t counter_count_store(struct device *dev,
> - struct device_attribute *attr,
> - const char *buf, size_t len)
> -{
> - struct counter_device *const counter = dev_get_drvdata(dev);
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_count_unit *const component = devattr->component;
> - struct counter_count *const count = component->count;
> - int err;
> - unsigned long val;
> -
> - err = kstrtoul(buf, 0, &val);
> - if (err)
> - return err;
> -
> - err = counter->ops->count_write(counter, count, val);
> - if (err)
> - return err;
> -
> - return len;
> -}
> -
> -static const char *const counter_function_str[] = {
> - [COUNTER_FUNCTION_INCREASE] = "increase",
> - [COUNTER_FUNCTION_DECREASE] = "decrease",
> - [COUNTER_FUNCTION_PULSE_DIRECTION] = "pulse-direction",
> - [COUNTER_FUNCTION_QUADRATURE_X1_A] = "quadrature x1 a",
> - [COUNTER_FUNCTION_QUADRATURE_X1_B] = "quadrature x1 b",
> - [COUNTER_FUNCTION_QUADRATURE_X2_A] = "quadrature x2 a",
> - [COUNTER_FUNCTION_QUADRATURE_X2_B] = "quadrature x2 b",
> - [COUNTER_FUNCTION_QUADRATURE_X4] = "quadrature x4"
> -};
> -
> -static ssize_t counter_function_show(struct device *dev,
> - struct device_attribute *attr, char *buf)
> -{
> - int err;
> - struct counter_device *const counter = dev_get_drvdata(dev);
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_count_unit *const component = devattr->component;
> - struct counter_count *const count = component->count;
> - size_t func_index;
> - enum counter_function function;
> -
> - err = counter->ops->function_get(counter, count, &func_index);
> - if (err)
> - return err;
> -
> - count->function = func_index;
> -
> - function = count->functions_list[func_index];
> - return sprintf(buf, "%s\n", counter_function_str[function]);
> -}
> -
> -static ssize_t counter_function_store(struct device *dev,
> - struct device_attribute *attr,
> - const char *buf, size_t len)
> -{
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_count_unit *const component = devattr->component;
> - struct counter_count *const count = component->count;
> - const size_t num_functions = count->num_functions;
> - size_t func_index;
> - enum counter_function function;
> - int err;
> - struct counter_device *const counter = dev_get_drvdata(dev);
> -
> - /* Find requested Count function mode */
> - for (func_index = 0; func_index < num_functions; func_index++) {
> - function = count->functions_list[func_index];
> - if (sysfs_streq(buf, counter_function_str[function]))
> - break;
> - }
> - /* Return error if requested Count function mode not found */
> - if (func_index >= num_functions)
> - return -EINVAL;
> -
> - err = counter->ops->function_set(counter, count, func_index);
> - if (err)
> - return err;
> -
> - count->function = func_index;
> -
> - return len;
> -}
> -
> -struct counter_count_ext_unit {
> - struct counter_count *count;
> - const struct counter_count_ext *ext;
> -};
> -
> -static ssize_t counter_count_ext_show(struct device *dev,
> - struct device_attribute *attr, char *buf)
> -{
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_count_ext_unit *const comp = devattr->component;
> - const struct counter_count_ext *const ext = comp->ext;
> -
> - return ext->read(dev_get_drvdata(dev), comp->count, ext->priv, buf);
> -}
> -
> -static ssize_t counter_count_ext_store(struct device *dev,
> - struct device_attribute *attr,
> - const char *buf, size_t len)
> -{
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_count_ext_unit *const comp = devattr->component;
> - const struct counter_count_ext *const ext = comp->ext;
> -
> - return ext->write(dev_get_drvdata(dev), comp->count, ext->priv, buf,
> - len);
> -}
> -
> -static int counter_count_ext_register(
> - struct counter_device_attr_group *const group,
> - struct counter_count *const count)
> -{
> - size_t i;
> - const struct counter_count_ext *ext;
> - struct counter_count_ext_unit *count_ext_comp;
> - struct counter_attr_parm parm;
> - int err;
> -
> - /* Create an attribute for each extension */
> - for (i = 0 ; i < count->num_ext; i++) {
> - ext = count->ext + i;
> -
> - /* Allocate count_ext attribute component */
> - count_ext_comp = kmalloc(sizeof(*count_ext_comp), GFP_KERNEL);
> - if (!count_ext_comp) {
> - err = -ENOMEM;
> - goto err_free_attr_list;
> - }
> - count_ext_comp->count = count;
> - count_ext_comp->ext = ext;
> -
> - /* Allocate count_ext attribute */
> - parm.group = group;
> - parm.prefix = "";
> - parm.name = ext->name;
> - parm.show = (ext->read) ? counter_count_ext_show : NULL;
> - parm.store = (ext->write) ? counter_count_ext_store : NULL;
> - parm.component = count_ext_comp;
> - err = counter_attribute_create(&parm);
> - if (err) {
> - kfree(count_ext_comp);
> - goto err_free_attr_list;
> - }
> - }
> -
> - return 0;
> -
> -err_free_attr_list:
> - counter_device_attr_list_free(&group->attr_list);
> - return err;
> -}
> -
> -struct counter_func_avail_unit {
> - const enum counter_function *functions_list;
> - size_t num_functions;
> -};
> -
> -static ssize_t counter_function_available_show(struct device *dev,
> - struct device_attribute *attr, char *buf)
> -{
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_func_avail_unit *const component = devattr->component;
> - const enum counter_function *const func_list = component->functions_list;
> - const size_t num_functions = component->num_functions;
> - size_t i;
> - enum counter_function function;
> - ssize_t len = 0;
> -
> - for (i = 0; i < num_functions; i++) {
> - function = func_list[i];
> - len += sprintf(buf + len, "%s\n",
> - counter_function_str[function]);
> - }
> -
> - return len;
> -}
> -
> -static int counter_count_attributes_create(
> - struct counter_device_attr_group *const group,
> - const struct counter_device *const counter,
> - struct counter_count *const count)
> -{
> - struct counter_count_unit *count_comp;
> - struct counter_attr_parm parm;
> - int err;
> - struct counter_count_unit *func_comp;
> - struct counter_func_avail_unit *avail_comp;
> -
> - /* Allocate count attribute component */
> - count_comp = kmalloc(sizeof(*count_comp), GFP_KERNEL);
> - if (!count_comp)
> - return -ENOMEM;
> - count_comp->count = count;
> -
> - /* Create main Count attribute */
> - parm.group = group;
> - parm.prefix = "";
> - parm.name = "count";
> - parm.show = (counter->ops->count_read) ? counter_count_show : NULL;
> - parm.store = (counter->ops->count_write) ? counter_count_store : NULL;
> - parm.component = count_comp;
> - err = counter_attribute_create(&parm);
> - if (err) {
> - kfree(count_comp);
> - return err;
> - }
> -
> - /* Allocate function attribute component */
> - func_comp = kmalloc(sizeof(*func_comp), GFP_KERNEL);
> - if (!func_comp) {
> - err = -ENOMEM;
> - goto err_free_attr_list;
> - }
> - func_comp->count = count;
> -
> - /* Create Count function attribute */
> - parm.group = group;
> - parm.prefix = "";
> - parm.name = "function";
> - parm.show = (counter->ops->function_get) ? counter_function_show : NULL;
> - parm.store = (counter->ops->function_set) ? counter_function_store : NULL;
> - parm.component = func_comp;
> - err = counter_attribute_create(&parm);
> - if (err) {
> - kfree(func_comp);
> - goto err_free_attr_list;
> - }
> -
> - /* Allocate function available attribute component */
> - avail_comp = kmalloc(sizeof(*avail_comp), GFP_KERNEL);
> - if (!avail_comp) {
> - err = -ENOMEM;
> - goto err_free_attr_list;
> - }
> - avail_comp->functions_list = count->functions_list;
> - avail_comp->num_functions = count->num_functions;
> -
> - /* Create Count function_available attribute */
> - parm.group = group;
> - parm.prefix = "";
> - parm.name = "function_available";
> - parm.show = counter_function_available_show;
> - parm.store = NULL;
> - parm.component = avail_comp;
> - err = counter_attribute_create(&parm);
> - if (err) {
> - kfree(avail_comp);
> - goto err_free_attr_list;
> - }
> -
> - /* Create Count name attribute */
> - err = counter_name_attribute_create(group, count->name);
> - if (err)
> - goto err_free_attr_list;
> -
> - /* Register Count extension attributes */
> - err = counter_count_ext_register(group, count);
> - if (err)
> - goto err_free_attr_list;
> -
> - return 0;
> -
> -err_free_attr_list:
> - counter_device_attr_list_free(&group->attr_list);
> - return err;
> -}
> -
> -static int counter_counts_register(
> - struct counter_device_attr_group *const groups_list,
> - const struct counter_device *const counter)
> -{
> - size_t i;
> - struct counter_count *count;
> - const char *name;
> - int err;
> -
> - /* Register each Count */
> - for (i = 0; i < counter->num_counts; i++) {
> - count = counter->counts + i;
> -
> - /* Generate Count attribute directory name */
> - name = kasprintf(GFP_KERNEL, "count%d", count->id);
> - if (!name) {
> - err = -ENOMEM;
> - goto err_free_attr_groups;
> - }
> - groups_list[i].attr_group.name = name;
> -
> - /* Register the Synapses associated with each Count */
> - err = counter_synapses_register(groups_list + i, counter, count,
> - name);
> - if (err)
> - goto err_free_attr_groups;
> -
> - /* Create all attributes associated with Count */
> - err = counter_count_attributes_create(groups_list + i, counter,
> - count);
> - if (err)
> - goto err_free_attr_groups;
> - }
> -
> - return 0;
> -
> -err_free_attr_groups:
> - do {
> - kfree(groups_list[i].attr_group.name);
> - counter_device_attr_list_free(&groups_list[i].attr_list);
> - } while (i--);
> - return err;
> -}
> -
> -struct counter_size_unit {
> - size_t size;
> -};
> -
> -static ssize_t counter_device_attr_size_show(struct device *dev,
> - struct device_attribute *attr,
> - char *buf)
> -{
> - const struct counter_size_unit *const comp = to_counter_attr(attr)->component;
> -
> - return sprintf(buf, "%zu\n", comp->size);
> -}
> -
> -static int counter_size_attribute_create(
> - struct counter_device_attr_group *const group,
> - const size_t size, const char *const name)
> -{
> - struct counter_size_unit *size_comp;
> - struct counter_attr_parm parm;
> - int err;
> -
> - /* Allocate size attribute component */
> - size_comp = kmalloc(sizeof(*size_comp), GFP_KERNEL);
> - if (!size_comp)
> - return -ENOMEM;
> - size_comp->size = size;
> -
> - parm.group = group;
> - parm.prefix = "";
> - parm.name = name;
> - parm.show = counter_device_attr_size_show;
> - parm.store = NULL;
> - parm.component = size_comp;
> - err = counter_attribute_create(&parm);
> - if (err)
> - goto err_free_size_comp;
> -
> - return 0;
> -
> -err_free_size_comp:
> - kfree(size_comp);
> - return err;
> -}
> -
> -struct counter_ext_unit {
> - const struct counter_device_ext *ext;
> -};
> -
> -static ssize_t counter_device_ext_show(struct device *dev,
> - struct device_attribute *attr, char *buf)
> -{
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_ext_unit *const component = devattr->component;
> - const struct counter_device_ext *const ext = component->ext;
> -
> - return ext->read(dev_get_drvdata(dev), ext->priv, buf);
> -}
> -
> -static ssize_t counter_device_ext_store(struct device *dev,
> - struct device_attribute *attr,
> - const char *buf, size_t len)
> -{
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_ext_unit *const component = devattr->component;
> - const struct counter_device_ext *const ext = component->ext;
> -
> - return ext->write(dev_get_drvdata(dev), ext->priv, buf, len);
> -}
> -
> -static int counter_device_ext_register(
> - struct counter_device_attr_group *const group,
> - struct counter_device *const counter)
> -{
> - size_t i;
> - struct counter_ext_unit *ext_comp;
> - struct counter_attr_parm parm;
> - int err;
> -
> - /* Create an attribute for each extension */
> - for (i = 0 ; i < counter->num_ext; i++) {
> - /* Allocate extension attribute component */
> - ext_comp = kmalloc(sizeof(*ext_comp), GFP_KERNEL);
> - if (!ext_comp) {
> - err = -ENOMEM;
> - goto err_free_attr_list;
> - }
> -
> - ext_comp->ext = counter->ext + i;
> -
> - /* Allocate extension attribute */
> - parm.group = group;
> - parm.prefix = "";
> - parm.name = counter->ext[i].name;
> - parm.show = (counter->ext[i].read) ? counter_device_ext_show : NULL;
> - parm.store = (counter->ext[i].write) ? counter_device_ext_store : NULL;
> - parm.component = ext_comp;
> - err = counter_attribute_create(&parm);
> - if (err) {
> - kfree(ext_comp);
> - goto err_free_attr_list;
> - }
> - }
> -
> - return 0;
> -
> -err_free_attr_list:
> - counter_device_attr_list_free(&group->attr_list);
> - return err;
> -}
> -
> -static int counter_global_attr_register(
> - struct counter_device_attr_group *const group,
> - struct counter_device *const counter)
> -{
> - int err;
> -
> - /* Create name attribute */
> - err = counter_name_attribute_create(group, counter->name);
> - if (err)
> - return err;
> -
> - /* Create num_counts attribute */
> - err = counter_size_attribute_create(group, counter->num_counts,
> - "num_counts");
> - if (err)
> - goto err_free_attr_list;
> -
> - /* Create num_signals attribute */
> - err = counter_size_attribute_create(group, counter->num_signals,
> - "num_signals");
> - if (err)
> - goto err_free_attr_list;
> -
> - /* Register Counter device extension attributes */
> - err = counter_device_ext_register(group, counter);
> - if (err)
> - goto err_free_attr_list;
> -
> - return 0;
> -
> -err_free_attr_list:
> - counter_device_attr_list_free(&group->attr_list);
> - return err;
> -}
> -
> -static void counter_device_groups_list_free(
> - struct counter_device_attr_group *const groups_list,
> - const size_t num_groups)
> -{
> - struct counter_device_attr_group *group;
> - size_t i;
> -
> - /* loop through all attribute groups (signals, counts, global, etc.) */
> - for (i = 0; i < num_groups; i++) {
> - group = groups_list + i;
> -
> - /* free all attribute group and associated attributes memory */
> - kfree(group->attr_group.name);
> - kfree(group->attr_group.attrs);
> - counter_device_attr_list_free(&group->attr_list);
> - }
> -
> - kfree(groups_list);
> -}
> -
> -static int counter_device_groups_list_prepare(
> - struct counter_device *const counter)
> -{
> - const size_t total_num_groups =
> - counter->num_signals + counter->num_counts + 1;
> - struct counter_device_attr_group *groups_list;
> - size_t i;
> - int err;
> - size_t num_groups = 0;
> -
> - /* Allocate space for attribute groups (signals, counts, and ext) */
> - groups_list = kcalloc(total_num_groups, sizeof(*groups_list),
> - GFP_KERNEL);
> - if (!groups_list)
> - return -ENOMEM;
> -
> - /* Initialize attribute lists */
> - for (i = 0; i < total_num_groups; i++)
> - INIT_LIST_HEAD(&groups_list[i].attr_list);
> -
> - /* Register Signals */
> - err = counter_signals_register(groups_list, counter);
> - if (err)
> - goto err_free_groups_list;
> - num_groups += counter->num_signals;
> -
> - /* Register Counts and respective Synapses */
> - err = counter_counts_register(groups_list + num_groups, counter);
> - if (err)
> - goto err_free_groups_list;
> - num_groups += counter->num_counts;
> -
> - /* Register Counter global attributes */
> - err = counter_global_attr_register(groups_list + num_groups, counter);
> - if (err)
> - goto err_free_groups_list;
> - num_groups++;
> -
> - /* Store groups_list in device_state */
> - counter->device_state->groups_list = groups_list;
> - counter->device_state->num_groups = num_groups;
> -
> - return 0;
> -
> -err_free_groups_list:
> - counter_device_groups_list_free(groups_list, num_groups);
> - return err;
> -}
> -
> -static int counter_device_groups_prepare(
> - struct counter_device_state *const device_state)
> -{
> - size_t i, j;
> - struct counter_device_attr_group *group;
> - int err;
> - struct counter_device_attr *p;
> -
> - /* Allocate attribute groups for association with device */
> - device_state->groups = kcalloc(device_state->num_groups + 1,
> - sizeof(*device_state->groups),
> - GFP_KERNEL);
> - if (!device_state->groups)
> - return -ENOMEM;
> -
> - /* Prepare each group of attributes for association */
> - for (i = 0; i < device_state->num_groups; i++) {
> - group = device_state->groups_list + i;
> -
> - /* Allocate space for attribute pointers in attribute group */
> - group->attr_group.attrs = kcalloc(group->num_attr + 1,
> - sizeof(*group->attr_group.attrs), GFP_KERNEL);
> - if (!group->attr_group.attrs) {
> - err = -ENOMEM;
> - goto err_free_groups;
> - }
> -
> - /* Add attribute pointers to attribute group */
> - j = 0;
> - list_for_each_entry(p, &group->attr_list, l)
> - group->attr_group.attrs[j++] = &p->dev_attr.attr;
> -
> - /* Group attributes in attribute group */
> - device_state->groups[i] = &group->attr_group;
> - }
> - /* Associate attributes with device */
> - device_state->dev.groups = device_state->groups;
> -
> - return 0;
> -
> -err_free_groups:
> - do {
> - group = device_state->groups_list + i;
> - kfree(group->attr_group.attrs);
> - group->attr_group.attrs = NULL;
> - } while (i--);
> - kfree(device_state->groups);
> - return err;
> -}
> -
> -/* Provides a unique ID for each counter device */
> -static DEFINE_IDA(counter_ida);
> -
> -static void counter_device_release(struct device *dev)
> -{
> - struct counter_device *const counter = dev_get_drvdata(dev);
> - struct counter_device_state *const device_state = counter->device_state;
> -
> - kfree(device_state->groups);
> - counter_device_groups_list_free(device_state->groups_list,
> - device_state->num_groups);
> - ida_simple_remove(&counter_ida, device_state->id);
> - kfree(device_state);
> -}
> -
> -static struct device_type counter_device_type = {
> - .name = "counter_device",
> - .release = counter_device_release
> -};
> -
> -static struct bus_type counter_bus_type = {
> - .name = "counter"
> -};
> -
> -/**
> - * counter_register - register Counter to the system
> - * @counter: pointer to Counter to register
> - *
> - * This function registers a Counter to the system. A sysfs "counter" directory
> - * will be created and populated with sysfs attributes correlating with the
> - * Counter Signals, Synapses, and Counts respectively.
> - */
> -int counter_register(struct counter_device *const counter)
> -{
> - struct counter_device_state *device_state;
> - int err;
> -
> - /* Allocate internal state container for Counter device */
> - device_state = kzalloc(sizeof(*device_state), GFP_KERNEL);
> - if (!device_state)
> - return -ENOMEM;
> - counter->device_state = device_state;
> -
> - /* Acquire unique ID */
> - device_state->id = ida_simple_get(&counter_ida, 0, 0, GFP_KERNEL);
> - if (device_state->id < 0) {
> - err = device_state->id;
> - goto err_free_device_state;
> - }
> -
> - /* Configure device structure for Counter */
> - device_state->dev.type = &counter_device_type;
> - device_state->dev.bus = &counter_bus_type;
> - if (counter->parent) {
> - device_state->dev.parent = counter->parent;
> - device_state->dev.of_node = counter->parent->of_node;
> - }
> - dev_set_name(&device_state->dev, "counter%d", device_state->id);
> - device_initialize(&device_state->dev);
> - dev_set_drvdata(&device_state->dev, counter);
> -
> - /* Prepare device attributes */
> - err = counter_device_groups_list_prepare(counter);
> - if (err)
> - goto err_free_id;
> -
> - /* Organize device attributes to groups and match to device */
> - err = counter_device_groups_prepare(device_state);
> - if (err)
> - goto err_free_groups_list;
> -
> - /* Add device to system */
> - err = device_add(&device_state->dev);
> - if (err)
> - goto err_free_groups;
> -
> - return 0;
> -
> -err_free_groups:
> - kfree(device_state->groups);
> -err_free_groups_list:
> - counter_device_groups_list_free(device_state->groups_list,
> - device_state->num_groups);
> -err_free_id:
> - ida_simple_remove(&counter_ida, device_state->id);
> -err_free_device_state:
> - kfree(device_state);
> - return err;
> -}
> -EXPORT_SYMBOL_GPL(counter_register);
> -
> -/**
> - * counter_unregister - unregister Counter from the system
> - * @counter: pointer to Counter to unregister
> - *
> - * The Counter is unregistered from the system; all allocated memory is freed.
> - */
> -void counter_unregister(struct counter_device *const counter)
> -{
> - if (counter)
> - device_del(&counter->device_state->dev);
> -}
> -EXPORT_SYMBOL_GPL(counter_unregister);
> -
> -static void devm_counter_unreg(struct device *dev, void *res)
> -{
> - counter_unregister(*(struct counter_device **)res);
> -}
> -
> -/**
> - * devm_counter_register - Resource-managed counter_register
> - * @dev: device to allocate counter_device for
> - * @counter: pointer to Counter to register
> - *
> - * Managed counter_register. The Counter registered with this function is
> - * automatically unregistered on driver detach. This function calls
> - * counter_register internally. Refer to that function for more information.
> - *
> - * If an Counter registered with this function needs to be unregistered
> - * separately, devm_counter_unregister must be used.
> - *
> - * RETURNS:
> - * 0 on success, negative error number on failure.
> - */
> -int devm_counter_register(struct device *dev,
> - struct counter_device *const counter)
> -{
> - struct counter_device **ptr;
> - int ret;
> -
> - ptr = devres_alloc(devm_counter_unreg, sizeof(*ptr), GFP_KERNEL);
> - if (!ptr)
> - return -ENOMEM;
> -
> - ret = counter_register(counter);
> - if (!ret) {
> - *ptr = counter;
> - devres_add(dev, ptr);
> - } else {
> - devres_free(ptr);
> - }
> -
> - return ret;
> -}
> -EXPORT_SYMBOL_GPL(devm_counter_register);
> -
> -static int devm_counter_match(struct device *dev, void *res, void *data)
> -{
> - struct counter_device **r = res;
> -
> - if (!r || !*r) {
> - WARN_ON(!r || !*r);
> - return 0;
> - }
> -
> - return *r == data;
> -}
> -
> -/**
> - * devm_counter_unregister - Resource-managed counter_unregister
> - * @dev: device this counter_device belongs to
> - * @counter: pointer to Counter associated with the device
> - *
> - * Unregister Counter registered with devm_counter_register.
> - */
> -void devm_counter_unregister(struct device *dev,
> - struct counter_device *const counter)
> -{
> - int rc;
> -
> - rc = devres_release(dev, devm_counter_unreg, devm_counter_match,
> - counter);
> - WARN_ON(rc);
> -}
> -EXPORT_SYMBOL_GPL(devm_counter_unregister);
> -
> -static int __init counter_init(void)
> -{
> - return bus_register(&counter_bus_type);
> -}
> -
> -static void __exit counter_exit(void)
> -{
> - bus_unregister(&counter_bus_type);
> -}
> -
> -subsys_initcall(counter_init);
> -module_exit(counter_exit);
> -
> -MODULE_AUTHOR("William Breathitt Gray <[email protected]>");
> -MODULE_DESCRIPTION("Generic Counter interface");
> -MODULE_LICENSE("GPL v2");
> diff --git a/drivers/counter/ftm-quaddec.c b/drivers/counter/ftm-quaddec.c
> index 53c15f84909b..092a806a46d8 100644
> --- a/drivers/counter/ftm-quaddec.c
> +++ b/drivers/counter/ftm-quaddec.c
> @@ -14,6 +14,7 @@
> #include <linux/mutex.h>
> #include <linux/counter.h>
> #include <linux/bitfield.h>
> +#include <linux/types.h>
>
> #define FTM_FIELD_UPDATE(ftm, offset, mask, val) \
> ({ \
> @@ -115,8 +116,7 @@ static void ftm_quaddec_disable(void *ftm)
> }
>
> static int ftm_quaddec_get_prescaler(struct counter_device *counter,
> - struct counter_count *count,
> - size_t *cnt_mode)
> + struct counter_count *count, u32 *cnt_mode)
> {
> struct ftm_quaddec *ftm = counter->priv;
> uint32_t scflags;
> @@ -129,8 +129,7 @@ static int ftm_quaddec_get_prescaler(struct counter_device *counter,
> }
>
> static int ftm_quaddec_set_prescaler(struct counter_device *counter,
> - struct counter_count *count,
> - size_t cnt_mode)
> + struct counter_count *count, u32 cnt_mode)
> {
> struct ftm_quaddec *ftm = counter->priv;
>
> @@ -151,33 +150,21 @@ static const char * const ftm_quaddec_prescaler[] = {
> "1", "2", "4", "8", "16", "32", "64", "128"
> };
>
> -static struct counter_count_enum_ext ftm_quaddec_prescaler_enum = {
> - .items = ftm_quaddec_prescaler,
> - .num_items = ARRAY_SIZE(ftm_quaddec_prescaler),
> - .get = ftm_quaddec_get_prescaler,
> - .set = ftm_quaddec_set_prescaler
> -};
> -
> -enum ftm_quaddec_synapse_action {
> - FTM_QUADDEC_SYNAPSE_ACTION_BOTH_EDGES,
> -};
> -
> static const enum counter_synapse_action ftm_quaddec_synapse_actions[] = {
> - [FTM_QUADDEC_SYNAPSE_ACTION_BOTH_EDGES] =
> COUNTER_SYNAPSE_ACTION_BOTH_EDGES
> };
>
> enum ftm_quaddec_count_function {
> - FTM_QUADDEC_COUNT_ENCODER_MODE_1,
> + FTM_QUADDEC_COUNT_ENCODER_MODE_1 = COUNTER_FUNCTION_QUADRATURE_X4,
> };
>
> static const enum counter_function ftm_quaddec_count_functions[] = {
> - [FTM_QUADDEC_COUNT_ENCODER_MODE_1] = COUNTER_FUNCTION_QUADRATURE_X4
> + FTM_QUADDEC_COUNT_ENCODER_MODE_1
> };
>
> static int ftm_quaddec_count_read(struct counter_device *counter,
> struct counter_count *count,
> - unsigned long *val)
> + u64 *val)
> {
> struct ftm_quaddec *const ftm = counter->priv;
> uint32_t cntval;
> @@ -191,7 +178,7 @@ static int ftm_quaddec_count_read(struct counter_device *counter,
>
> static int ftm_quaddec_count_write(struct counter_device *counter,
> struct counter_count *count,
> - const unsigned long val)
> + const u64 val)
> {
> struct ftm_quaddec *const ftm = counter->priv;
>
> @@ -205,21 +192,21 @@ static int ftm_quaddec_count_write(struct counter_device *counter,
> return 0;
> }
>
> -static int ftm_quaddec_count_function_get(struct counter_device *counter,
> - struct counter_count *count,
> - size_t *function)
> +static int ftm_quaddec_count_function_read(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_function *function)
> {
> *function = FTM_QUADDEC_COUNT_ENCODER_MODE_1;
>
> return 0;
> }
>
> -static int ftm_quaddec_action_get(struct counter_device *counter,
> - struct counter_count *count,
> - struct counter_synapse *synapse,
> - size_t *action)
> +static int ftm_quaddec_action_read(struct counter_device *counter,
> + struct counter_count *count,
> + struct counter_synapse *synapse,
> + enum counter_synapse_action *action)
> {
> - *action = FTM_QUADDEC_SYNAPSE_ACTION_BOTH_EDGES;
> + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
>
> return 0;
> }
> @@ -227,8 +214,8 @@ static int ftm_quaddec_action_get(struct counter_device *counter,
> static const struct counter_ops ftm_quaddec_cnt_ops = {
> .count_read = ftm_quaddec_count_read,
> .count_write = ftm_quaddec_count_write,
> - .function_get = ftm_quaddec_count_function_get,
> - .action_get = ftm_quaddec_action_get,
> + .function_read = ftm_quaddec_count_function_read,
> + .action_read = ftm_quaddec_action_read,
> };
>
> static struct counter_signal ftm_quaddec_signals[] = {
> @@ -255,9 +242,12 @@ static struct counter_synapse ftm_quaddec_count_synapses[] = {
> }
> };
>
> -static const struct counter_count_ext ftm_quaddec_count_ext[] = {
> - COUNTER_COUNT_ENUM("prescaler", &ftm_quaddec_prescaler_enum),
> - COUNTER_COUNT_ENUM_AVAILABLE("prescaler", &ftm_quaddec_prescaler_enum),
> +static DEFINE_COUNTER_ENUM(ftm_quaddec_prescaler_enum, ftm_quaddec_prescaler);
> +
> +static struct counter_comp ftm_quaddec_count_ext[] = {
> + COUNTER_COMP_COUNT_ENUM("prescaler", ftm_quaddec_get_prescaler,
> + ftm_quaddec_set_prescaler,
> + ftm_quaddec_prescaler_enum),
> };
>
> static struct counter_count ftm_quaddec_counts = {
> diff --git a/drivers/counter/intel-qep.c b/drivers/counter/intel-qep.c
> index f4be9d78c84c..ec056f31fa55 100644
> --- a/drivers/counter/intel-qep.c
> +++ b/drivers/counter/intel-qep.c
> @@ -63,13 +63,6 @@
>
> #define INTEL_QEP_CLK_PERIOD_NS 10
>
> -#define INTEL_QEP_COUNTER_EXT_RW(_name) \
> -{ \
> - .name = #_name, \
> - .read = _name##_read, \
> - .write = _name##_write, \
> -}
> -
> struct intel_qep {
> struct counter_device counter;
> struct mutex lock;
> @@ -115,8 +108,7 @@ static void intel_qep_init(struct intel_qep *qep)
> }
>
> static int intel_qep_count_read(struct counter_device *counter,
> - struct counter_count *count,
> - unsigned long *val)
> + struct counter_count *count, u64 *val)
> {
> struct intel_qep *const qep = counter->priv;
>
> @@ -131,11 +123,11 @@ static const enum counter_function intel_qep_count_functions[] = {
> COUNTER_FUNCTION_QUADRATURE_X4,
> };
>
> -static int intel_qep_function_get(struct counter_device *counter,
> - struct counter_count *count,
> - size_t *function)
> +static int intel_qep_function_read(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_function *function)
> {
> - *function = 0;
> + *function = COUNTER_FUNCTION_QUADRATURE_X4;
>
> return 0;
> }
> @@ -144,19 +136,19 @@ static const enum counter_synapse_action intel_qep_synapse_actions[] = {
> COUNTER_SYNAPSE_ACTION_BOTH_EDGES,
> };
>
> -static int intel_qep_action_get(struct counter_device *counter,
> - struct counter_count *count,
> - struct counter_synapse *synapse,
> - size_t *action)
> +static int intel_qep_action_read(struct counter_device *counter,
> + struct counter_count *count,
> + struct counter_synapse *synapse,
> + enum counter_synapse_action *action)
> {
> - *action = 0;
> + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
> return 0;
> }
>
> static const struct counter_ops intel_qep_counter_ops = {
> .count_read = intel_qep_count_read,
> - .function_get = intel_qep_function_get,
> - .action_get = intel_qep_action_get,
> + .function_read = intel_qep_function_read,
> + .action_read = intel_qep_action_read,
> };
>
> #define INTEL_QEP_SIGNAL(_id, _name) { \
> @@ -182,31 +174,27 @@ static struct counter_synapse intel_qep_count_synapses[] = {
> INTEL_QEP_SYNAPSE(2),
> };
>
> -static ssize_t ceiling_read(struct counter_device *counter,
> - struct counter_count *count,
> - void *priv, char *buf)
> +static int intel_qep_ceiling_read(struct counter_device *counter,
> + struct counter_count *count, u64 *ceiling)
> {
> struct intel_qep *qep = counter->priv;
> - u32 reg;
>
> pm_runtime_get_sync(qep->dev);
> - reg = intel_qep_readl(qep, INTEL_QEPMAX);
> + *ceiling = intel_qep_readl(qep, INTEL_QEPMAX);
> pm_runtime_put(qep->dev);
>
> - return sysfs_emit(buf, "%u\n", reg);
> + return 0;
> }
>
> -static ssize_t ceiling_write(struct counter_device *counter,
> - struct counter_count *count,
> - void *priv, const char *buf, size_t len)
> +static int intel_qep_ceiling_write(struct counter_device *counter,
> + struct counter_count *count, u64 max)
> {
> struct intel_qep *qep = counter->priv;
> - u32 max;
> - int ret;
> + int ret = 0;
>
> - ret = kstrtou32(buf, 0, &max);
> - if (ret < 0)
> - return ret;
> + /* Intel QEP ceiling configuration only supports 32-bit values */
> + if (max != (u32)max)
> + return -ERANGE;
>
> mutex_lock(&qep->lock);
> if (qep->enabled) {
> @@ -217,34 +205,28 @@ static ssize_t ceiling_write(struct counter_device *counter,
> pm_runtime_get_sync(qep->dev);
> intel_qep_writel(qep, INTEL_QEPMAX, max);
> pm_runtime_put(qep->dev);
> - ret = len;
>
> out:
> mutex_unlock(&qep->lock);
> return ret;
> }
>
> -static ssize_t enable_read(struct counter_device *counter,
> - struct counter_count *count,
> - void *priv, char *buf)
> +static int intel_qep_enable_read(struct counter_device *counter,
> + struct counter_count *count, u8 *enable)
> {
> struct intel_qep *qep = counter->priv;
>
> - return sysfs_emit(buf, "%u\n", qep->enabled);
> + *enable = qep->enabled;
> +
> + return 0;
> }
>
> -static ssize_t enable_write(struct counter_device *counter,
> - struct counter_count *count,
> - void *priv, const char *buf, size_t len)
> +static int intel_qep_enable_write(struct counter_device *counter,
> + struct counter_count *count, u8 val)
> {
> struct intel_qep *qep = counter->priv;
> u32 reg;
> - bool val, changed;
> - int ret;
> -
> - ret = kstrtobool(buf, &val);
> - if (ret)
> - return ret;
> + bool changed;
>
> mutex_lock(&qep->lock);
> changed = val ^ qep->enabled;
> @@ -268,12 +250,12 @@ static ssize_t enable_write(struct counter_device *counter,
>
> out:
> mutex_unlock(&qep->lock);
> - return len;
> + return 0;
> }
>
> -static ssize_t spike_filter_ns_read(struct counter_device *counter,
> - struct counter_count *count,
> - void *priv, char *buf)
> +static int intel_qep_spike_filter_ns_read(struct counter_device *counter,
> + struct counter_count *count,
> + u64 *length)
> {
> struct intel_qep *qep = counter->priv;
> u32 reg;
> @@ -282,26 +264,24 @@ static ssize_t spike_filter_ns_read(struct counter_device *counter,
> reg = intel_qep_readl(qep, INTEL_QEPCON);
> if (!(reg & INTEL_QEPCON_FLT_EN)) {
> pm_runtime_put(qep->dev);
> - return sysfs_emit(buf, "0\n");
> + return 0;
> }
> reg = INTEL_QEPFLT_MAX_COUNT(intel_qep_readl(qep, INTEL_QEPFLT));
> pm_runtime_put(qep->dev);
>
> - return sysfs_emit(buf, "%u\n", (reg + 2) * INTEL_QEP_CLK_PERIOD_NS);
> + *length = (reg + 2) * INTEL_QEP_CLK_PERIOD_NS;
> +
> + return 0;
> }
>
> -static ssize_t spike_filter_ns_write(struct counter_device *counter,
> - struct counter_count *count,
> - void *priv, const char *buf, size_t len)
> +static int intel_qep_spike_filter_ns_write(struct counter_device *counter,
> + struct counter_count *count,
> + u64 length)
> {
> struct intel_qep *qep = counter->priv;
> - u32 reg, length;
> + u32 reg;
> bool enable;
> - int ret;
> -
> - ret = kstrtou32(buf, 0, &length);
> - if (ret < 0)
> - return ret;
> + int ret = 0;
>
> /*
> * Spike filter length is (MAX_COUNT + 2) clock periods.
> @@ -337,16 +317,15 @@ static ssize_t spike_filter_ns_write(struct counter_device *counter,
> intel_qep_writel(qep, INTEL_QEPFLT, length);
> intel_qep_writel(qep, INTEL_QEPCON, reg);
> pm_runtime_put(qep->dev);
> - ret = len;
>
> out:
> mutex_unlock(&qep->lock);
> return ret;
> }
>
> -static ssize_t preset_enable_read(struct counter_device *counter,
> - struct counter_count *count,
> - void *priv, char *buf)
> +static int intel_qep_preset_enable_read(struct counter_device *counter,
> + struct counter_count *count,
> + u8 *preset_enable)
> {
> struct intel_qep *qep = counter->priv;
> u32 reg;
> @@ -354,21 +333,18 @@ static ssize_t preset_enable_read(struct counter_device *counter,
> pm_runtime_get_sync(qep->dev);
> reg = intel_qep_readl(qep, INTEL_QEPCON);
> pm_runtime_put(qep->dev);
> - return sysfs_emit(buf, "%u\n", !(reg & INTEL_QEPCON_COUNT_RST_MODE));
> +
> + *preset_enable = !(reg & INTEL_QEPCON_COUNT_RST_MODE);
> +
> + return 0;
> }
>
> -static ssize_t preset_enable_write(struct counter_device *counter,
> - struct counter_count *count,
> - void *priv, const char *buf, size_t len)
> +static int intel_qep_preset_enable_write(struct counter_device *counter,
> + struct counter_count *count, u8 val)
> {
> struct intel_qep *qep = counter->priv;
> u32 reg;
> - bool val;
> - int ret;
> -
> - ret = kstrtobool(buf, &val);
> - if (ret)
> - return ret;
> + int ret = 0;
>
> mutex_lock(&qep->lock);
> if (qep->enabled) {
> @@ -385,7 +361,6 @@ static ssize_t preset_enable_write(struct counter_device *counter,
>
> intel_qep_writel(qep, INTEL_QEPCON, reg);
> pm_runtime_put(qep->dev);
> - ret = len;
>
> out:
> mutex_unlock(&qep->lock);
> @@ -393,11 +368,14 @@ static ssize_t preset_enable_write(struct counter_device *counter,
> return ret;
> }
>
> -static const struct counter_count_ext intel_qep_count_ext[] = {
> - INTEL_QEP_COUNTER_EXT_RW(ceiling),
> - INTEL_QEP_COUNTER_EXT_RW(enable),
> - INTEL_QEP_COUNTER_EXT_RW(spike_filter_ns),
> - INTEL_QEP_COUNTER_EXT_RW(preset_enable)
> +static struct counter_comp intel_qep_count_ext[] = {
> + COUNTER_COMP_ENABLE(intel_qep_enable_read, intel_qep_enable_write),
> + COUNTER_COMP_CEILING(intel_qep_ceiling_read, intel_qep_ceiling_write),
> + COUNTER_COMP_PRESET_ENABLE(intel_qep_preset_enable_read,
> + intel_qep_preset_enable_write),
> + COUNTER_COMP_COUNT_U64("spike_filter_ns",
> + intel_qep_spike_filter_ns_read,
> + intel_qep_spike_filter_ns_write),
> };
>
> static struct counter_count intel_qep_counter_count[] = {
> diff --git a/drivers/counter/interrupt-cnt.c b/drivers/counter/interrupt-cnt.c
> index 1de4243db488..8514a87fcbee 100644
> --- a/drivers/counter/interrupt-cnt.c
> +++ b/drivers/counter/interrupt-cnt.c
> @@ -10,6 +10,7 @@
> #include <linux/mod_devicetable.h>
> #include <linux/module.h>
> #include <linux/platform_device.h>
> +#include <linux/types.h>
>
> #define INTERRUPT_CNT_NAME "interrupt-cnt"
>
> @@ -33,30 +34,23 @@ static irqreturn_t interrupt_cnt_isr(int irq, void *dev_id)
> return IRQ_HANDLED;
> }
>
> -static ssize_t interrupt_cnt_enable_read(struct counter_device *counter,
> - struct counter_count *count,
> - void *private, char *buf)
> +static int interrupt_cnt_enable_read(struct counter_device *counter,
> + struct counter_count *count, u8 *enable)
> {
> struct interrupt_cnt_priv *priv = counter->priv;
>
> - return sysfs_emit(buf, "%d\n", priv->enabled);
> + *enable = priv->enabled;
> +
> + return 0;
> }
>
> -static ssize_t interrupt_cnt_enable_write(struct counter_device *counter,
> - struct counter_count *count,
> - void *private, const char *buf,
> - size_t len)
> +static int interrupt_cnt_enable_write(struct counter_device *counter,
> + struct counter_count *count, u8 enable)
> {
> struct interrupt_cnt_priv *priv = counter->priv;
> - bool enable;
> - ssize_t ret;
> -
> - ret = kstrtobool(buf, &enable);
> - if (ret)
> - return ret;
>
> if (priv->enabled == enable)
> - return len;
> + return 0;
>
> if (enable) {
> priv->enabled = true;
> @@ -66,33 +60,30 @@ static ssize_t interrupt_cnt_enable_write(struct counter_device *counter,
> priv->enabled = false;
> }
>
> - return len;
> + return 0;
> }
>
> -static const struct counter_count_ext interrupt_cnt_ext[] = {
> - {
> - .name = "enable",
> - .read = interrupt_cnt_enable_read,
> - .write = interrupt_cnt_enable_write,
> - },
> +static struct counter_comp interrupt_cnt_ext[] = {
> + COUNTER_COMP_ENABLE(interrupt_cnt_enable_read,
> + interrupt_cnt_enable_write),
> };
>
> static const enum counter_synapse_action interrupt_cnt_synapse_actions[] = {
> COUNTER_SYNAPSE_ACTION_RISING_EDGE,
> };
>
> -static int interrupt_cnt_action_get(struct counter_device *counter,
> - struct counter_count *count,
> - struct counter_synapse *synapse,
> - size_t *action)
> +static int interrupt_cnt_action_read(struct counter_device *counter,
> + struct counter_count *count,
> + struct counter_synapse *synapse,
> + enum counter_synapse_action *action)
> {
> - *action = 0;
> + *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE;
>
> return 0;
> }
>
> static int interrupt_cnt_read(struct counter_device *counter,
> - struct counter_count *count, unsigned long *val)
> + struct counter_count *count, u64 *val)
> {
> struct interrupt_cnt_priv *priv = counter->priv;
>
> @@ -102,8 +93,7 @@ static int interrupt_cnt_read(struct counter_device *counter,
> }
>
> static int interrupt_cnt_write(struct counter_device *counter,
> - struct counter_count *count,
> - const unsigned long val)
> + struct counter_count *count, const u64 val)
> {
> struct interrupt_cnt_priv *priv = counter->priv;
>
> @@ -119,11 +109,11 @@ static const enum counter_function interrupt_cnt_functions[] = {
> COUNTER_FUNCTION_INCREASE,
> };
>
> -static int interrupt_cnt_function_get(struct counter_device *counter,
> - struct counter_count *count,
> - size_t *function)
> +static int interrupt_cnt_function_read(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_function *function)
> {
> - *function = 0;
> + *function = COUNTER_FUNCTION_INCREASE;
>
> return 0;
> }
> @@ -148,10 +138,10 @@ static int interrupt_cnt_signal_read(struct counter_device *counter,
> }
>
> static const struct counter_ops interrupt_cnt_ops = {
> - .action_get = interrupt_cnt_action_get,
> + .action_read = interrupt_cnt_action_read,
> .count_read = interrupt_cnt_read,
> .count_write = interrupt_cnt_write,
> - .function_get = interrupt_cnt_function_get,
> + .function_read = interrupt_cnt_function_read,
> .signal_read = interrupt_cnt_signal_read,
> };
>
> diff --git a/drivers/counter/microchip-tcb-capture.c b/drivers/counter/microchip-tcb-capture.c
> index 4c57d43e7d66..79e0c84a3b81 100644
> --- a/drivers/counter/microchip-tcb-capture.c
> +++ b/drivers/counter/microchip-tcb-capture.c
> @@ -32,28 +32,16 @@ struct mchp_tc_data {
> bool trig_inverted;
> };
>
> -enum mchp_tc_count_function {
> - MCHP_TC_FUNCTION_INCREASE,
> - MCHP_TC_FUNCTION_QUADRATURE,
> -};
> -
> -static const enum counter_count_function mchp_tc_count_functions[] = {
> - [MCHP_TC_FUNCTION_INCREASE] = COUNTER_FUNCTION_INCREASE,
> - [MCHP_TC_FUNCTION_QUADRATURE] = COUNTER_FUNCTION_QUADRATURE_X4,
> -};
> -
> -enum mchp_tc_synapse_action {
> - MCHP_TC_SYNAPSE_ACTION_NONE = 0,
> - MCHP_TC_SYNAPSE_ACTION_RISING_EDGE,
> - MCHP_TC_SYNAPSE_ACTION_FALLING_EDGE,
> - MCHP_TC_SYNAPSE_ACTION_BOTH_EDGE
> +static const enum counter_function mchp_tc_count_functions[] = {
> + COUNTER_FUNCTION_INCREASE,
> + COUNTER_FUNCTION_QUADRATURE_X4,
> };
>
> static const enum counter_synapse_action mchp_tc_synapse_actions[] = {
> - [MCHP_TC_SYNAPSE_ACTION_NONE] = COUNTER_SYNAPSE_ACTION_NONE,
> - [MCHP_TC_SYNAPSE_ACTION_RISING_EDGE] = COUNTER_SYNAPSE_ACTION_RISING_EDGE,
> - [MCHP_TC_SYNAPSE_ACTION_FALLING_EDGE] = COUNTER_SYNAPSE_ACTION_FALLING_EDGE,
> - [MCHP_TC_SYNAPSE_ACTION_BOTH_EDGE] = COUNTER_SYNAPSE_ACTION_BOTH_EDGES,
> + COUNTER_SYNAPSE_ACTION_NONE,
> + COUNTER_SYNAPSE_ACTION_RISING_EDGE,
> + COUNTER_SYNAPSE_ACTION_FALLING_EDGE,
> + COUNTER_SYNAPSE_ACTION_BOTH_EDGES,
> };
>
> static struct counter_signal mchp_tc_count_signals[] = {
> @@ -80,23 +68,23 @@ static struct counter_synapse mchp_tc_count_synapses[] = {
> }
> };
>
> -static int mchp_tc_count_function_get(struct counter_device *counter,
> - struct counter_count *count,
> - size_t *function)
> +static int mchp_tc_count_function_read(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_function *function)
> {
> struct mchp_tc_data *const priv = counter->priv;
>
> if (priv->qdec_mode)
> - *function = MCHP_TC_FUNCTION_QUADRATURE;
> + *function = COUNTER_FUNCTION_QUADRATURE_X4;
> else
> - *function = MCHP_TC_FUNCTION_INCREASE;
> + *function = COUNTER_FUNCTION_INCREASE;
>
> return 0;
> }
>
> -static int mchp_tc_count_function_set(struct counter_device *counter,
> - struct counter_count *count,
> - size_t function)
> +static int mchp_tc_count_function_write(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_function function)
> {
> struct mchp_tc_data *const priv = counter->priv;
> u32 bmr, cmr;
> @@ -108,7 +96,7 @@ static int mchp_tc_count_function_set(struct counter_device *counter,
> cmr &= ~ATMEL_TC_WAVE;
>
> switch (function) {
> - case MCHP_TC_FUNCTION_INCREASE:
> + case COUNTER_FUNCTION_INCREASE:
> priv->qdec_mode = 0;
> /* Set highest rate based on whether soc has gclk or not */
> bmr &= ~(ATMEL_TC_QDEN | ATMEL_TC_POSEN);
> @@ -120,7 +108,7 @@ static int mchp_tc_count_function_set(struct counter_device *counter,
> cmr |= ATMEL_TC_CMR_MASK;
> cmr &= ~(ATMEL_TC_ABETRG | ATMEL_TC_XC0);
> break;
> - case MCHP_TC_FUNCTION_QUADRATURE:
> + case COUNTER_FUNCTION_QUADRATURE_X4:
> if (!priv->tc_cfg->has_qdec)
> return -EINVAL;
> /* In QDEC mode settings both channels 0 and 1 are required */
> @@ -176,10 +164,10 @@ static int mchp_tc_count_signal_read(struct counter_device *counter,
> return 0;
> }
>
> -static int mchp_tc_count_action_get(struct counter_device *counter,
> - struct counter_count *count,
> - struct counter_synapse *synapse,
> - size_t *action)
> +static int mchp_tc_count_action_read(struct counter_device *counter,
> + struct counter_count *count,
> + struct counter_synapse *synapse,
> + enum counter_synapse_action *action)
> {
> struct mchp_tc_data *const priv = counter->priv;
> u32 cmr;
> @@ -188,26 +176,26 @@ static int mchp_tc_count_action_get(struct counter_device *counter,
>
> switch (cmr & ATMEL_TC_ETRGEDG) {
> default:
> - *action = MCHP_TC_SYNAPSE_ACTION_NONE;
> + *action = COUNTER_SYNAPSE_ACTION_NONE;
> break;
> case ATMEL_TC_ETRGEDG_RISING:
> - *action = MCHP_TC_SYNAPSE_ACTION_RISING_EDGE;
> + *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE;
> break;
> case ATMEL_TC_ETRGEDG_FALLING:
> - *action = MCHP_TC_SYNAPSE_ACTION_FALLING_EDGE;
> + *action = COUNTER_SYNAPSE_ACTION_FALLING_EDGE;
> break;
> case ATMEL_TC_ETRGEDG_BOTH:
> - *action = MCHP_TC_SYNAPSE_ACTION_BOTH_EDGE;
> + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
> break;
> }
>
> return 0;
> }
>
> -static int mchp_tc_count_action_set(struct counter_device *counter,
> - struct counter_count *count,
> - struct counter_synapse *synapse,
> - size_t action)
> +static int mchp_tc_count_action_write(struct counter_device *counter,
> + struct counter_count *count,
> + struct counter_synapse *synapse,
> + enum counter_synapse_action action)
> {
> struct mchp_tc_data *const priv = counter->priv;
> u32 edge = ATMEL_TC_ETRGEDG_NONE;
> @@ -217,16 +205,16 @@ static int mchp_tc_count_action_set(struct counter_device *counter,
> return -EINVAL;
>
> switch (action) {
> - case MCHP_TC_SYNAPSE_ACTION_NONE:
> + case COUNTER_SYNAPSE_ACTION_NONE:
> edge = ATMEL_TC_ETRGEDG_NONE;
> break;
> - case MCHP_TC_SYNAPSE_ACTION_RISING_EDGE:
> + case COUNTER_SYNAPSE_ACTION_RISING_EDGE:
> edge = ATMEL_TC_ETRGEDG_RISING;
> break;
> - case MCHP_TC_SYNAPSE_ACTION_FALLING_EDGE:
> + case COUNTER_SYNAPSE_ACTION_FALLING_EDGE:
> edge = ATMEL_TC_ETRGEDG_FALLING;
> break;
> - case MCHP_TC_SYNAPSE_ACTION_BOTH_EDGE:
> + case COUNTER_SYNAPSE_ACTION_BOTH_EDGES:
> edge = ATMEL_TC_ETRGEDG_BOTH;
> break;
> default:
> @@ -240,8 +228,7 @@ static int mchp_tc_count_action_set(struct counter_device *counter,
> }
>
> static int mchp_tc_count_read(struct counter_device *counter,
> - struct counter_count *count,
> - unsigned long *val)
> + struct counter_count *count, u64 *val)
> {
> struct mchp_tc_data *const priv = counter->priv;
> u32 cnt;
> @@ -264,12 +251,12 @@ static struct counter_count mchp_tc_counts[] = {
> };
>
> static const struct counter_ops mchp_tc_ops = {
> - .signal_read = mchp_tc_count_signal_read,
> - .count_read = mchp_tc_count_read,
> - .function_get = mchp_tc_count_function_get,
> - .function_set = mchp_tc_count_function_set,
> - .action_get = mchp_tc_count_action_get,
> - .action_set = mchp_tc_count_action_set
> + .signal_read = mchp_tc_count_signal_read,
> + .count_read = mchp_tc_count_read,
> + .function_read = mchp_tc_count_function_read,
> + .function_write = mchp_tc_count_function_write,
> + .action_read = mchp_tc_count_action_read,
> + .action_write = mchp_tc_count_action_write
> };
>
> static const struct atmel_tcb_config tcb_rm9200_config = {
> diff --git a/drivers/counter/stm32-lptimer-cnt.c b/drivers/counter/stm32-lptimer-cnt.c
> index 13656957c45f..aef78a4217b5 100644
> --- a/drivers/counter/stm32-lptimer-cnt.c
> +++ b/drivers/counter/stm32-lptimer-cnt.c
> @@ -17,6 +17,7 @@
> #include <linux/module.h>
> #include <linux/pinctrl/consumer.h>
> #include <linux/platform_device.h>
> +#include <linux/types.h>
>
> struct stm32_lptim_cnt {
> struct counter_device counter;
> @@ -130,32 +131,46 @@ static int stm32_lptim_setup(struct stm32_lptim_cnt *priv, int enable)
> * +---------+----------+----------+---------+----------+---------+
> */
> enum stm32_lptim_cnt_function {
> - STM32_LPTIM_COUNTER_INCREASE,
> - STM32_LPTIM_ENCODER_BOTH_EDGE,
> + STM32_LPTIM_COUNTER_INCREASE = COUNTER_FUNCTION_INCREASE,
> + STM32_LPTIM_ENCODER_BOTH_EDGE = COUNTER_FUNCTION_QUADRATURE_X4,
> };
>
> static const enum counter_function stm32_lptim_cnt_functions[] = {
> - [STM32_LPTIM_COUNTER_INCREASE] = COUNTER_FUNCTION_INCREASE,
> - [STM32_LPTIM_ENCODER_BOTH_EDGE] = COUNTER_FUNCTION_QUADRATURE_X4,
> + STM32_LPTIM_COUNTER_INCREASE,
> + STM32_LPTIM_ENCODER_BOTH_EDGE,
> };
>
> enum stm32_lptim_synapse_action {
> + /* Index must match with stm32_lptim_cnt_polarity[] (priv->polarity) */
> STM32_LPTIM_SYNAPSE_ACTION_RISING_EDGE,
> STM32_LPTIM_SYNAPSE_ACTION_FALLING_EDGE,
> STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES,
> STM32_LPTIM_SYNAPSE_ACTION_NONE,
> };
>
> -static const enum counter_synapse_action stm32_lptim_cnt_synapse_actions[] = {
> - /* Index must match with stm32_lptim_cnt_polarity[] (priv->polarity) */
> +static const enum stm32_lptim_synapse_action stm32_lptim_c2l_actions_map[] = {
> + [COUNTER_SYNAPSE_ACTION_RISING_EDGE] = STM32_LPTIM_SYNAPSE_ACTION_RISING_EDGE,
> + [COUNTER_SYNAPSE_ACTION_FALLING_EDGE] = STM32_LPTIM_SYNAPSE_ACTION_FALLING_EDGE,
> + [COUNTER_SYNAPSE_ACTION_BOTH_EDGES] = STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES,
> + [COUNTER_SYNAPSE_ACTION_NONE] = STM32_LPTIM_SYNAPSE_ACTION_NONE,
> +};
> +
> +static const enum counter_synapse_action stm32_lptim_l2c_actions_map[] = {
> [STM32_LPTIM_SYNAPSE_ACTION_RISING_EDGE] = COUNTER_SYNAPSE_ACTION_RISING_EDGE,
> [STM32_LPTIM_SYNAPSE_ACTION_FALLING_EDGE] = COUNTER_SYNAPSE_ACTION_FALLING_EDGE,
> [STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES] = COUNTER_SYNAPSE_ACTION_BOTH_EDGES,
> [STM32_LPTIM_SYNAPSE_ACTION_NONE] = COUNTER_SYNAPSE_ACTION_NONE,
> };
>
> +static const enum counter_synapse_action stm32_lptim_cnt_synapse_actions[] = {
> + COUNTER_SYNAPSE_ACTION_RISING_EDGE,
> + COUNTER_SYNAPSE_ACTION_FALLING_EDGE,
> + COUNTER_SYNAPSE_ACTION_BOTH_EDGES,
> + COUNTER_SYNAPSE_ACTION_NONE,
> +};
> +
> static int stm32_lptim_cnt_read(struct counter_device *counter,
> - struct counter_count *count, unsigned long *val)
> + struct counter_count *count, u64 *val)
> {
> struct stm32_lptim_cnt *const priv = counter->priv;
> u32 cnt;
> @@ -170,9 +185,9 @@ static int stm32_lptim_cnt_read(struct counter_device *counter,
> return 0;
> }
>
> -static int stm32_lptim_cnt_function_get(struct counter_device *counter,
> - struct counter_count *count,
> - size_t *function)
> +static int stm32_lptim_cnt_function_read(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_function *function)
> {
> struct stm32_lptim_cnt *const priv = counter->priv;
>
> @@ -189,9 +204,9 @@ static int stm32_lptim_cnt_function_get(struct counter_device *counter,
> return -EINVAL;
> }
>
> -static int stm32_lptim_cnt_function_set(struct counter_device *counter,
> - struct counter_count *count,
> - size_t function)
> +static int stm32_lptim_cnt_function_write(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_function function)
> {
> struct stm32_lptim_cnt *const priv = counter->priv;
>
> @@ -212,9 +227,9 @@ static int stm32_lptim_cnt_function_set(struct counter_device *counter,
> }
> }
>
> -static ssize_t stm32_lptim_cnt_enable_read(struct counter_device *counter,
> - struct counter_count *count,
> - void *private, char *buf)
> +static int stm32_lptim_cnt_enable_read(struct counter_device *counter,
> + struct counter_count *count,
> + u8 *enable)
> {
> struct stm32_lptim_cnt *const priv = counter->priv;
> int ret;
> @@ -223,22 +238,18 @@ static ssize_t stm32_lptim_cnt_enable_read(struct counter_device *counter,
> if (ret < 0)
> return ret;
>
> - return scnprintf(buf, PAGE_SIZE, "%u\n", ret);
> + *enable = ret;
> +
> + return 0;
> }
>
> -static ssize_t stm32_lptim_cnt_enable_write(struct counter_device *counter,
> - struct counter_count *count,
> - void *private,
> - const char *buf, size_t len)
> +static int stm32_lptim_cnt_enable_write(struct counter_device *counter,
> + struct counter_count *count,
> + u8 enable)
> {
> struct stm32_lptim_cnt *const priv = counter->priv;
> - bool enable;
> int ret;
>
> - ret = kstrtobool(buf, &enable);
> - if (ret)
> - return ret;
> -
> /* Check nobody uses the timer, or already disabled/enabled */
> ret = stm32_lptim_is_enabled(priv);
> if ((ret < 0) || (!ret && !enable))
> @@ -254,65 +265,54 @@ static ssize_t stm32_lptim_cnt_enable_write(struct counter_device *counter,
> if (ret)
> return ret;
>
> - return len;
> + return 0;
> }
>
> -static ssize_t stm32_lptim_cnt_ceiling_read(struct counter_device *counter,
> - struct counter_count *count,
> - void *private, char *buf)
> +static int stm32_lptim_cnt_ceiling_read(struct counter_device *counter,
> + struct counter_count *count,
> + u64 *ceiling)
> {
> struct stm32_lptim_cnt *const priv = counter->priv;
>
> - return snprintf(buf, PAGE_SIZE, "%u\n", priv->ceiling);
> + *ceiling = priv->ceiling;
> +
> + return 0;
> }
>
> -static ssize_t stm32_lptim_cnt_ceiling_write(struct counter_device *counter,
> - struct counter_count *count,
> - void *private,
> - const char *buf, size_t len)
> +static int stm32_lptim_cnt_ceiling_write(struct counter_device *counter,
> + struct counter_count *count,
> + u64 ceiling)
> {
> struct stm32_lptim_cnt *const priv = counter->priv;
> - unsigned int ceiling;
> - int ret;
>
> if (stm32_lptim_is_enabled(priv))
> return -EBUSY;
>
> - ret = kstrtouint(buf, 0, &ceiling);
> - if (ret)
> - return ret;
> -
> if (ceiling > STM32_LPTIM_MAX_ARR)
> return -ERANGE;
>
> priv->ceiling = ceiling;
>
> - return len;
> + return 0;
> }
>
> -static const struct counter_count_ext stm32_lptim_cnt_ext[] = {
> - {
> - .name = "enable",
> - .read = stm32_lptim_cnt_enable_read,
> - .write = stm32_lptim_cnt_enable_write
> - },
> - {
> - .name = "ceiling",
> - .read = stm32_lptim_cnt_ceiling_read,
> - .write = stm32_lptim_cnt_ceiling_write
> - },
> +static struct counter_comp stm32_lptim_cnt_ext[] = {
> + COUNTER_COMP_ENABLE(stm32_lptim_cnt_enable_read,
> + stm32_lptim_cnt_enable_write),
> + COUNTER_COMP_CEILING(stm32_lptim_cnt_ceiling_read,
> + stm32_lptim_cnt_ceiling_write),
> };
>
> -static int stm32_lptim_cnt_action_get(struct counter_device *counter,
> - struct counter_count *count,
> - struct counter_synapse *synapse,
> - size_t *action)
> +static int stm32_lptim_cnt_action_read(struct counter_device *counter,
> + struct counter_count *count,
> + struct counter_synapse *synapse,
> + enum counter_synapse_action *action)
> {
> struct stm32_lptim_cnt *const priv = counter->priv;
> - size_t function;
> + enum counter_function function;
> int err;
>
> - err = stm32_lptim_cnt_function_get(counter, count, &function);
> + err = stm32_lptim_cnt_function_read(counter, count, &function);
> if (err)
> return err;
>
> @@ -320,12 +320,12 @@ static int stm32_lptim_cnt_action_get(struct counter_device *counter,
> case STM32_LPTIM_COUNTER_INCREASE:
> /* LP Timer acts as up-counter on input 1 */
> if (synapse->signal->id == count->synapses[0].signal->id)
> - *action = priv->polarity;
> + *action = stm32_lptim_l2c_actions_map[priv->polarity];
> else
> - *action = STM32_LPTIM_SYNAPSE_ACTION_NONE;
> + *action = COUNTER_SYNAPSE_ACTION_NONE;
> return 0;
> case STM32_LPTIM_ENCODER_BOTH_EDGE:
> - *action = priv->polarity;
> + *action = stm32_lptim_l2c_actions_map[priv->polarity];
> return 0;
> default:
> /* should never reach this path */
> @@ -333,43 +333,39 @@ static int stm32_lptim_cnt_action_get(struct counter_device *counter,
> }
> }
>
> -static int stm32_lptim_cnt_action_set(struct counter_device *counter,
> - struct counter_count *count,
> - struct counter_synapse *synapse,
> - size_t action)
> +static int stm32_lptim_cnt_action_write(struct counter_device *counter,
> + struct counter_count *count,
> + struct counter_synapse *synapse,
> + enum counter_synapse_action action)
> {
> struct stm32_lptim_cnt *const priv = counter->priv;
> - size_t function;
> + enum counter_function function;
> int err;
>
> if (stm32_lptim_is_enabled(priv))
> return -EBUSY;
>
> - err = stm32_lptim_cnt_function_get(counter, count, &function);
> + err = stm32_lptim_cnt_function_read(counter, count, &function);
> if (err)
> return err;
>
> /* only set polarity when in counter mode (on input 1) */
> - if (function == STM32_LPTIM_COUNTER_INCREASE
> - && synapse->signal->id == count->synapses[0].signal->id) {
> - switch (action) {
> - case STM32_LPTIM_SYNAPSE_ACTION_RISING_EDGE:
> - case STM32_LPTIM_SYNAPSE_ACTION_FALLING_EDGE:
> - case STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES:
> - priv->polarity = action;
> - return 0;
> - }
> - }
> + if ((enum stm32_lptim_cnt_function)function != STM32_LPTIM_COUNTER_INCREASE
> + || synapse->signal->id != count->synapses[0].signal->id
> + || action == COUNTER_SYNAPSE_ACTION_NONE)
> + return -EINVAL;
>
> - return -EINVAL;
> + priv->polarity = stm32_lptim_c2l_actions_map[action];
> +
> + return 0;
> }
>
> static const struct counter_ops stm32_lptim_cnt_ops = {
> .count_read = stm32_lptim_cnt_read,
> - .function_get = stm32_lptim_cnt_function_get,
> - .function_set = stm32_lptim_cnt_function_set,
> - .action_get = stm32_lptim_cnt_action_get,
> - .action_set = stm32_lptim_cnt_action_set,
> + .function_read = stm32_lptim_cnt_function_read,
> + .function_write = stm32_lptim_cnt_function_write,
> + .action_read = stm32_lptim_cnt_action_read,
> + .action_write = stm32_lptim_cnt_action_write,
> };
>
> static struct counter_signal stm32_lptim_cnt_signals[] = {
> diff --git a/drivers/counter/stm32-timer-cnt.c b/drivers/counter/stm32-timer-cnt.c
> index 3fb0debd7425..c690b76e5dab 100644
> --- a/drivers/counter/stm32-timer-cnt.c
> +++ b/drivers/counter/stm32-timer-cnt.c
> @@ -13,6 +13,7 @@
> #include <linux/module.h>
> #include <linux/pinctrl/consumer.h>
> #include <linux/platform_device.h>
> +#include <linux/types.h>
>
> #define TIM_CCMR_CCXS (BIT(8) | BIT(0))
> #define TIM_CCMR_MASK (TIM_CCMR_CC1S | TIM_CCMR_CC2S | \
> @@ -44,21 +45,21 @@ struct stm32_timer_cnt {
> * @STM32_COUNT_ENCODER_MODE_3: counts on both TI1FP1 and TI2FP2 edges
> */
> enum stm32_count_function {
> + STM32_COUNT_SLAVE_MODE_DISABLED = COUNTER_FUNCTION_INCREASE,
> + STM32_COUNT_ENCODER_MODE_1 = COUNTER_FUNCTION_QUADRATURE_X2_A,
> + STM32_COUNT_ENCODER_MODE_2 = COUNTER_FUNCTION_QUADRATURE_X2_B,
> + STM32_COUNT_ENCODER_MODE_3 = COUNTER_FUNCTION_QUADRATURE_X4,
> +};
> +
> +static const enum counter_function stm32_count_functions[] = {
> STM32_COUNT_SLAVE_MODE_DISABLED,
> STM32_COUNT_ENCODER_MODE_1,
> STM32_COUNT_ENCODER_MODE_2,
> STM32_COUNT_ENCODER_MODE_3,
> };
>
> -static const enum counter_function stm32_count_functions[] = {
> - [STM32_COUNT_SLAVE_MODE_DISABLED] = COUNTER_FUNCTION_INCREASE,
> - [STM32_COUNT_ENCODER_MODE_1] = COUNTER_FUNCTION_QUADRATURE_X2_A,
> - [STM32_COUNT_ENCODER_MODE_2] = COUNTER_FUNCTION_QUADRATURE_X2_B,
> - [STM32_COUNT_ENCODER_MODE_3] = COUNTER_FUNCTION_QUADRATURE_X4,
> -};
> -
> static int stm32_count_read(struct counter_device *counter,
> - struct counter_count *count, unsigned long *val)
> + struct counter_count *count, u64 *val)
> {
> struct stm32_timer_cnt *const priv = counter->priv;
> u32 cnt;
> @@ -70,8 +71,7 @@ static int stm32_count_read(struct counter_device *counter,
> }
>
> static int stm32_count_write(struct counter_device *counter,
> - struct counter_count *count,
> - const unsigned long val)
> + struct counter_count *count, const u64 val)
> {
> struct stm32_timer_cnt *const priv = counter->priv;
> u32 ceiling;
> @@ -83,9 +83,9 @@ static int stm32_count_write(struct counter_device *counter,
> return regmap_write(priv->regmap, TIM_CNT, val);
> }
>
> -static int stm32_count_function_get(struct counter_device *counter,
> - struct counter_count *count,
> - size_t *function)
> +static int stm32_count_function_read(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_function *function)
> {
> struct stm32_timer_cnt *const priv = counter->priv;
> u32 smcr;
> @@ -110,9 +110,9 @@ static int stm32_count_function_get(struct counter_device *counter,
> }
> }
>
> -static int stm32_count_function_set(struct counter_device *counter,
> - struct counter_count *count,
> - size_t function)
> +static int stm32_count_function_write(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_function function)
> {
> struct stm32_timer_cnt *const priv = counter->priv;
> u32 cr1, sms;
> @@ -150,44 +150,37 @@ static int stm32_count_function_set(struct counter_device *counter,
> return 0;
> }
>
> -static ssize_t stm32_count_direction_read(struct counter_device *counter,
> +static int stm32_count_direction_read(struct counter_device *counter,
> struct counter_count *count,
> - void *private, char *buf)
> + enum counter_count_direction *direction)
> {
> struct stm32_timer_cnt *const priv = counter->priv;
> - const char *direction;
> u32 cr1;
>
> regmap_read(priv->regmap, TIM_CR1, &cr1);
> - direction = (cr1 & TIM_CR1_DIR) ? "backward" : "forward";
> + *direction = (cr1 & TIM_CR1_DIR) ? COUNTER_COUNT_DIRECTION_BACKWARD :
> + COUNTER_COUNT_DIRECTION_FORWARD;
>
> - return scnprintf(buf, PAGE_SIZE, "%s\n", direction);
> + return 0;
> }
>
> -static ssize_t stm32_count_ceiling_read(struct counter_device *counter,
> - struct counter_count *count,
> - void *private, char *buf)
> +static int stm32_count_ceiling_read(struct counter_device *counter,
> + struct counter_count *count, u64 *ceiling)
> {
> struct stm32_timer_cnt *const priv = counter->priv;
> u32 arr;
>
> regmap_read(priv->regmap, TIM_ARR, &arr);
>
> - return snprintf(buf, PAGE_SIZE, "%u\n", arr);
> + *ceiling = arr;
> +
> + return 0;
> }
>
> -static ssize_t stm32_count_ceiling_write(struct counter_device *counter,
> - struct counter_count *count,
> - void *private,
> - const char *buf, size_t len)
> +static int stm32_count_ceiling_write(struct counter_device *counter,
> + struct counter_count *count, u64 ceiling)
> {
> struct stm32_timer_cnt *const priv = counter->priv;
> - unsigned int ceiling;
> - int ret;
> -
> - ret = kstrtouint(buf, 0, &ceiling);
> - if (ret)
> - return ret;
>
> if (ceiling > priv->max_arr)
> return -ERANGE;
> @@ -196,34 +189,27 @@ static ssize_t stm32_count_ceiling_write(struct counter_device *counter,
> regmap_update_bits(priv->regmap, TIM_CR1, TIM_CR1_ARPE, 0);
> regmap_write(priv->regmap, TIM_ARR, ceiling);
>
> - return len;
> + return 0;
> }
>
> -static ssize_t stm32_count_enable_read(struct counter_device *counter,
> - struct counter_count *count,
> - void *private, char *buf)
> +static int stm32_count_enable_read(struct counter_device *counter,
> + struct counter_count *count, u8 *enable)
> {
> struct stm32_timer_cnt *const priv = counter->priv;
> u32 cr1;
>
> regmap_read(priv->regmap, TIM_CR1, &cr1);
>
> - return scnprintf(buf, PAGE_SIZE, "%d\n", (bool)(cr1 & TIM_CR1_CEN));
> + *enable = cr1 & TIM_CR1_CEN;
> +
> + return 0;
> }
>
> -static ssize_t stm32_count_enable_write(struct counter_device *counter,
> - struct counter_count *count,
> - void *private,
> - const char *buf, size_t len)
> +static int stm32_count_enable_write(struct counter_device *counter,
> + struct counter_count *count, u8 enable)
> {
> struct stm32_timer_cnt *const priv = counter->priv;
> - int err;
> u32 cr1;
> - bool enable;
> -
> - err = kstrtobool(buf, &enable);
> - if (err)
> - return err;
>
> if (enable) {
> regmap_read(priv->regmap, TIM_CR1, &cr1);
> @@ -242,70 +228,55 @@ static ssize_t stm32_count_enable_write(struct counter_device *counter,
> /* Keep enabled state to properly handle low power states */
> priv->enabled = enable;
>
> - return len;
> + return 0;
> }
>
> -static const struct counter_count_ext stm32_count_ext[] = {
> - {
> - .name = "direction",
> - .read = stm32_count_direction_read,
> - },
> - {
> - .name = "enable",
> - .read = stm32_count_enable_read,
> - .write = stm32_count_enable_write
> - },
> - {
> - .name = "ceiling",
> - .read = stm32_count_ceiling_read,
> - .write = stm32_count_ceiling_write
> - },
> -};
> -
> -enum stm32_synapse_action {
> - STM32_SYNAPSE_ACTION_NONE,
> - STM32_SYNAPSE_ACTION_BOTH_EDGES
> +static struct counter_comp stm32_count_ext[] = {
> + COUNTER_COMP_DIRECTION(stm32_count_direction_read),
> + COUNTER_COMP_ENABLE(stm32_count_enable_read, stm32_count_enable_write),
> + COUNTER_COMP_CEILING(stm32_count_ceiling_read,
> + stm32_count_ceiling_write),
> };
>
> static const enum counter_synapse_action stm32_synapse_actions[] = {
> - [STM32_SYNAPSE_ACTION_NONE] = COUNTER_SYNAPSE_ACTION_NONE,
> - [STM32_SYNAPSE_ACTION_BOTH_EDGES] = COUNTER_SYNAPSE_ACTION_BOTH_EDGES
> + COUNTER_SYNAPSE_ACTION_NONE,
> + COUNTER_SYNAPSE_ACTION_BOTH_EDGES
> };
>
> -static int stm32_action_get(struct counter_device *counter,
> - struct counter_count *count,
> - struct counter_synapse *synapse,
> - size_t *action)
> +static int stm32_action_read(struct counter_device *counter,
> + struct counter_count *count,
> + struct counter_synapse *synapse,
> + enum counter_synapse_action *action)
> {
> - size_t function;
> + enum counter_function function;
> int err;
>
> - err = stm32_count_function_get(counter, count, &function);
> + err = stm32_count_function_read(counter, count, &function);
> if (err)
> return err;
>
> switch (function) {
> case STM32_COUNT_SLAVE_MODE_DISABLED:
> /* counts on internal clock when CEN=1 */
> - *action = STM32_SYNAPSE_ACTION_NONE;
> + *action = COUNTER_SYNAPSE_ACTION_NONE;
> return 0;
> case STM32_COUNT_ENCODER_MODE_1:
> /* counts up/down on TI1FP1 edge depending on TI2FP2 level */
> if (synapse->signal->id == count->synapses[0].signal->id)
> - *action = STM32_SYNAPSE_ACTION_BOTH_EDGES;
> + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
> else
> - *action = STM32_SYNAPSE_ACTION_NONE;
> + *action = COUNTER_SYNAPSE_ACTION_NONE;
> return 0;
> case STM32_COUNT_ENCODER_MODE_2:
> /* counts up/down on TI2FP2 edge depending on TI1FP1 level */
> if (synapse->signal->id == count->synapses[1].signal->id)
> - *action = STM32_SYNAPSE_ACTION_BOTH_EDGES;
> + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
> else
> - *action = STM32_SYNAPSE_ACTION_NONE;
> + *action = COUNTER_SYNAPSE_ACTION_NONE;
> return 0;
> case STM32_COUNT_ENCODER_MODE_3:
> /* counts up/down on both TI1FP1 and TI2FP2 edges */
> - *action = STM32_SYNAPSE_ACTION_BOTH_EDGES;
> + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
> return 0;
> default:
> return -EINVAL;
> @@ -315,9 +286,9 @@ static int stm32_action_get(struct counter_device *counter,
> static const struct counter_ops stm32_timer_cnt_ops = {
> .count_read = stm32_count_read,
> .count_write = stm32_count_write,
> - .function_get = stm32_count_function_get,
> - .function_set = stm32_count_function_set,
> - .action_get = stm32_action_get,
> + .function_read = stm32_count_function_read,
> + .function_write = stm32_count_function_write,
> + .action_read = stm32_action_read,
> };
>
> static struct counter_signal stm32_signals[] = {
> diff --git a/drivers/counter/ti-eqep.c b/drivers/counter/ti-eqep.c
> index 94fe58bb3eab..09817c953f9a 100644
> --- a/drivers/counter/ti-eqep.c
> +++ b/drivers/counter/ti-eqep.c
> @@ -13,6 +13,7 @@
> #include <linux/platform_device.h>
> #include <linux/pm_runtime.h>
> #include <linux/regmap.h>
> +#include <linux/types.h>
>
> /* 32-bit registers */
> #define QPOSCNT 0x0
> @@ -73,19 +74,13 @@ enum {
> };
>
> /* Position Counter Input Modes */
> -enum {
> +enum ti_eqep_count_func {
> TI_EQEP_COUNT_FUNC_QUAD_COUNT,
> TI_EQEP_COUNT_FUNC_DIR_COUNT,
> TI_EQEP_COUNT_FUNC_UP_COUNT,
> TI_EQEP_COUNT_FUNC_DOWN_COUNT,
> };
>
> -enum {
> - TI_EQEP_SYNAPSE_ACTION_BOTH_EDGES,
> - TI_EQEP_SYNAPSE_ACTION_RISING_EDGE,
> - TI_EQEP_SYNAPSE_ACTION_NONE,
> -};
> -
> struct ti_eqep_cnt {
> struct counter_device counter;
> struct regmap *regmap32;
> @@ -93,7 +88,7 @@ struct ti_eqep_cnt {
> };
>
> static int ti_eqep_count_read(struct counter_device *counter,
> - struct counter_count *count, unsigned long *val)
> + struct counter_count *count, u64 *val)
> {
> struct ti_eqep_cnt *priv = counter->priv;
> u32 cnt;
> @@ -105,7 +100,7 @@ static int ti_eqep_count_read(struct counter_device *counter,
> }
>
> static int ti_eqep_count_write(struct counter_device *counter,
> - struct counter_count *count, unsigned long val)
> + struct counter_count *count, u64 val)
> {
> struct ti_eqep_cnt *priv = counter->priv;
> u32 max;
> @@ -117,64 +112,100 @@ static int ti_eqep_count_write(struct counter_device *counter,
> return regmap_write(priv->regmap32, QPOSCNT, val);
> }
>
> -static int ti_eqep_function_get(struct counter_device *counter,
> - struct counter_count *count, size_t *function)
> +static int ti_eqep_function_read(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_function *function)
> {
> struct ti_eqep_cnt *priv = counter->priv;
> u32 qdecctl;
>
> regmap_read(priv->regmap16, QDECCTL, &qdecctl);
> - *function = (qdecctl & QDECCTL_QSRC) >> QDECCTL_QSRC_SHIFT;
> +
> + switch ((qdecctl & QDECCTL_QSRC) >> QDECCTL_QSRC_SHIFT) {
> + case TI_EQEP_COUNT_FUNC_QUAD_COUNT:
> + *function = COUNTER_FUNCTION_QUADRATURE_X4;
> + break;
> + case TI_EQEP_COUNT_FUNC_DIR_COUNT:
> + *function = COUNTER_FUNCTION_PULSE_DIRECTION;
> + break;
> + case TI_EQEP_COUNT_FUNC_UP_COUNT:
> + *function = COUNTER_FUNCTION_INCREASE;
> + break;
> + case TI_EQEP_COUNT_FUNC_DOWN_COUNT:
> + *function = COUNTER_FUNCTION_DECREASE;
> + break;
> + }
>
> return 0;
> }
>
> -static int ti_eqep_function_set(struct counter_device *counter,
> - struct counter_count *count, size_t function)
> +static int ti_eqep_function_write(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_function function)
> {
> struct ti_eqep_cnt *priv = counter->priv;
> + enum ti_eqep_count_func qsrc;
> +
> + switch (function) {
> + case COUNTER_FUNCTION_QUADRATURE_X4:
> + qsrc = TI_EQEP_COUNT_FUNC_QUAD_COUNT;
> + break;
> + case COUNTER_FUNCTION_PULSE_DIRECTION:
> + qsrc = TI_EQEP_COUNT_FUNC_DIR_COUNT;
> + break;
> + case COUNTER_FUNCTION_INCREASE:
> + qsrc = TI_EQEP_COUNT_FUNC_UP_COUNT;
> + break;
> + case COUNTER_FUNCTION_DECREASE:
> + qsrc = TI_EQEP_COUNT_FUNC_DOWN_COUNT;
> + break;
> + default:
> + /* should never reach this path */
> + return -EINVAL;
> + }
>
> return regmap_write_bits(priv->regmap16, QDECCTL, QDECCTL_QSRC,
> - function << QDECCTL_QSRC_SHIFT);
> + qsrc << QDECCTL_QSRC_SHIFT);
> }
>
> -static int ti_eqep_action_get(struct counter_device *counter,
> - struct counter_count *count,
> - struct counter_synapse *synapse, size_t *action)
> +static int ti_eqep_action_read(struct counter_device *counter,
> + struct counter_count *count,
> + struct counter_synapse *synapse,
> + enum counter_synapse_action *action)
> {
> struct ti_eqep_cnt *priv = counter->priv;
> - size_t function;
> + enum counter_function function;
> u32 qdecctl;
> int err;
>
> - err = ti_eqep_function_get(counter, count, &function);
> + err = ti_eqep_function_read(counter, count, &function);
> if (err)
> return err;
>
> switch (function) {
> - case TI_EQEP_COUNT_FUNC_QUAD_COUNT:
> + case COUNTER_FUNCTION_QUADRATURE_X4:
> /* In quadrature mode, the rising and falling edge of both
> * QEPA and QEPB trigger QCLK.
> */
> - *action = TI_EQEP_SYNAPSE_ACTION_BOTH_EDGES;
> + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
> return 0;
> - case TI_EQEP_COUNT_FUNC_DIR_COUNT:
> + case COUNTER_FUNCTION_PULSE_DIRECTION:
> /* In direction-count mode only rising edge of QEPA is counted
> * and QEPB gives direction.
> */
> switch (synapse->signal->id) {
> case TI_EQEP_SIGNAL_QEPA:
> - *action = TI_EQEP_SYNAPSE_ACTION_RISING_EDGE;
> + *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE;
> return 0;
> case TI_EQEP_SIGNAL_QEPB:
> - *action = TI_EQEP_SYNAPSE_ACTION_NONE;
> + *action = COUNTER_SYNAPSE_ACTION_NONE;
> return 0;
> default:
> /* should never reach this path */
> return -EINVAL;
> }
> - case TI_EQEP_COUNT_FUNC_UP_COUNT:
> - case TI_EQEP_COUNT_FUNC_DOWN_COUNT:
> + case COUNTER_FUNCTION_INCREASE:
> + case COUNTER_FUNCTION_DECREASE:
> /* In up/down-count modes only QEPA is counted and QEPB is not
> * used.
> */
> @@ -185,12 +216,12 @@ static int ti_eqep_action_get(struct counter_device *counter,
> return err;
>
> if (qdecctl & QDECCTL_XCR)
> - *action = TI_EQEP_SYNAPSE_ACTION_BOTH_EDGES;
> + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
> else
> - *action = TI_EQEP_SYNAPSE_ACTION_RISING_EDGE;
> + *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE;
> return 0;
> case TI_EQEP_SIGNAL_QEPB:
> - *action = TI_EQEP_SYNAPSE_ACTION_NONE;
> + *action = COUNTER_SYNAPSE_ACTION_NONE;
> return 0;
> default:
> /* should never reach this path */
> @@ -205,82 +236,67 @@ static int ti_eqep_action_get(struct counter_device *counter,
> static const struct counter_ops ti_eqep_counter_ops = {
> .count_read = ti_eqep_count_read,
> .count_write = ti_eqep_count_write,
> - .function_get = ti_eqep_function_get,
> - .function_set = ti_eqep_function_set,
> - .action_get = ti_eqep_action_get,
> + .function_read = ti_eqep_function_read,
> + .function_write = ti_eqep_function_write,
> + .action_read = ti_eqep_action_read,
> };
>
> -static ssize_t ti_eqep_position_ceiling_read(struct counter_device *counter,
> - struct counter_count *count,
> - void *ext_priv, char *buf)
> +static int ti_eqep_position_ceiling_read(struct counter_device *counter,
> + struct counter_count *count,
> + u64 *ceiling)
> {
> struct ti_eqep_cnt *priv = counter->priv;
> u32 qposmax;
>
> regmap_read(priv->regmap32, QPOSMAX, &qposmax);
>
> - return sprintf(buf, "%u\n", qposmax);
> + *ceiling = qposmax;
> +
> + return 0;
> }
>
> -static ssize_t ti_eqep_position_ceiling_write(struct counter_device *counter,
> - struct counter_count *count,
> - void *ext_priv, const char *buf,
> - size_t len)
> +static int ti_eqep_position_ceiling_write(struct counter_device *counter,
> + struct counter_count *count,
> + u64 ceiling)
> {
> struct ti_eqep_cnt *priv = counter->priv;
> - int err;
> - u32 res;
>
> - err = kstrtouint(buf, 0, &res);
> - if (err < 0)
> - return err;
> + if (ceiling != (u32)ceiling)
> + return -ERANGE;
>
> - regmap_write(priv->regmap32, QPOSMAX, res);
> + regmap_write(priv->regmap32, QPOSMAX, ceiling);
>
> - return len;
> + return 0;
> }
>
> -static ssize_t ti_eqep_position_enable_read(struct counter_device *counter,
> - struct counter_count *count,
> - void *ext_priv, char *buf)
> +static int ti_eqep_position_enable_read(struct counter_device *counter,
> + struct counter_count *count, u8 *enable)
> {
> struct ti_eqep_cnt *priv = counter->priv;
> u32 qepctl;
>
> regmap_read(priv->regmap16, QEPCTL, &qepctl);
>
> - return sprintf(buf, "%u\n", !!(qepctl & QEPCTL_PHEN));
> + *enable = !!(qepctl & QEPCTL_PHEN);
> +
> + return 0;
> }
>
> -static ssize_t ti_eqep_position_enable_write(struct counter_device *counter,
> - struct counter_count *count,
> - void *ext_priv, const char *buf,
> - size_t len)
> +static int ti_eqep_position_enable_write(struct counter_device *counter,
> + struct counter_count *count, u8 enable)
> {
> struct ti_eqep_cnt *priv = counter->priv;
> - int err;
> - bool res;
> -
> - err = kstrtobool(buf, &res);
> - if (err < 0)
> - return err;
>
> - regmap_write_bits(priv->regmap16, QEPCTL, QEPCTL_PHEN, res ? -1 : 0);
> + regmap_write_bits(priv->regmap16, QEPCTL, QEPCTL_PHEN, enable ? -1 : 0);
>
> - return len;
> + return 0;
> }
>
> -static struct counter_count_ext ti_eqep_position_ext[] = {
> - {
> - .name = "ceiling",
> - .read = ti_eqep_position_ceiling_read,
> - .write = ti_eqep_position_ceiling_write,
> - },
> - {
> - .name = "enable",
> - .read = ti_eqep_position_enable_read,
> - .write = ti_eqep_position_enable_write,
> - },
> +static struct counter_comp ti_eqep_position_ext[] = {
> + COUNTER_COMP_CEILING(ti_eqep_position_ceiling_read,
> + ti_eqep_position_ceiling_write),
> + COUNTER_COMP_ENABLE(ti_eqep_position_enable_read,
> + ti_eqep_position_enable_write),
> };
>
> static struct counter_signal ti_eqep_signals[] = {
> @@ -295,16 +311,16 @@ static struct counter_signal ti_eqep_signals[] = {
> };
>
> static const enum counter_function ti_eqep_position_functions[] = {
> - [TI_EQEP_COUNT_FUNC_QUAD_COUNT] = COUNTER_FUNCTION_QUADRATURE_X4,
> - [TI_EQEP_COUNT_FUNC_DIR_COUNT] = COUNTER_FUNCTION_PULSE_DIRECTION,
> - [TI_EQEP_COUNT_FUNC_UP_COUNT] = COUNTER_FUNCTION_INCREASE,
> - [TI_EQEP_COUNT_FUNC_DOWN_COUNT] = COUNTER_FUNCTION_DECREASE,
> + COUNTER_FUNCTION_QUADRATURE_X4,
> + COUNTER_FUNCTION_PULSE_DIRECTION,
> + COUNTER_FUNCTION_INCREASE,
> + COUNTER_FUNCTION_DECREASE,
> };
>
> static const enum counter_synapse_action ti_eqep_position_synapse_actions[] = {
> - [TI_EQEP_SYNAPSE_ACTION_BOTH_EDGES] = COUNTER_SYNAPSE_ACTION_BOTH_EDGES,
> - [TI_EQEP_SYNAPSE_ACTION_RISING_EDGE] = COUNTER_SYNAPSE_ACTION_RISING_EDGE,
> - [TI_EQEP_SYNAPSE_ACTION_NONE] = COUNTER_SYNAPSE_ACTION_NONE,
> + COUNTER_SYNAPSE_ACTION_BOTH_EDGES,
> + COUNTER_SYNAPSE_ACTION_RISING_EDGE,
> + COUNTER_SYNAPSE_ACTION_NONE,
> };
>
> static struct counter_synapse ti_eqep_position_synapses[] = {
> diff --git a/include/linux/counter.h b/include/linux/counter.h
> index d16ce2819b48..b69277f5c4c5 100644
> --- a/include/linux/counter.h
> +++ b/include/linux/counter.h
> @@ -6,42 +6,184 @@
> #ifndef _COUNTER_H_
> #define _COUNTER_H_
>
> -#include <linux/counter_enum.h>
> #include <linux/device.h>
> +#include <linux/kernel.h>
> #include <linux/types.h>
>
> +struct counter_device;
> +struct counter_count;
> +struct counter_synapse;
> +struct counter_signal;
> +
> +enum counter_comp_type {
> + COUNTER_COMP_U8,
> + COUNTER_COMP_U64,
> + COUNTER_COMP_BOOL,
> + COUNTER_COMP_SIGNAL_LEVEL,
> + COUNTER_COMP_FUNCTION,
> + COUNTER_COMP_SYNAPSE_ACTION,
> + COUNTER_COMP_ENUM,
> + COUNTER_COMP_COUNT_DIRECTION,
> + COUNTER_COMP_COUNT_MODE,
> +};
> +
> +enum counter_scope {
> + COUNTER_SCOPE_DEVICE,
> + COUNTER_SCOPE_SIGNAL,
> + COUNTER_SCOPE_COUNT,
> +};
> +
> enum counter_count_direction {
> - COUNTER_COUNT_DIRECTION_FORWARD = 0,
> - COUNTER_COUNT_DIRECTION_BACKWARD
> + COUNTER_COUNT_DIRECTION_FORWARD,
> + COUNTER_COUNT_DIRECTION_BACKWARD,
> };
> -extern const char *const counter_count_direction_str[2];
>
> enum counter_count_mode {
> - COUNTER_COUNT_MODE_NORMAL = 0,
> + COUNTER_COUNT_MODE_NORMAL,
> COUNTER_COUNT_MODE_RANGE_LIMIT,
> COUNTER_COUNT_MODE_NON_RECYCLE,
> - COUNTER_COUNT_MODE_MODULO_N
> + COUNTER_COUNT_MODE_MODULO_N,
> };
> -extern const char *const counter_count_mode_str[4];
>
> -struct counter_device;
> -struct counter_signal;
> +enum counter_function {
> + COUNTER_FUNCTION_INCREASE,
> + COUNTER_FUNCTION_DECREASE,
> + COUNTER_FUNCTION_PULSE_DIRECTION,
> + COUNTER_FUNCTION_QUADRATURE_X1_A,
> + COUNTER_FUNCTION_QUADRATURE_X1_B,
> + COUNTER_FUNCTION_QUADRATURE_X2_A,
> + COUNTER_FUNCTION_QUADRATURE_X2_B,
> + COUNTER_FUNCTION_QUADRATURE_X4,
> +};
> +
> +enum counter_signal_level {
> + COUNTER_SIGNAL_LEVEL_LOW,
> + COUNTER_SIGNAL_LEVEL_HIGH,
> +};
> +
> +enum counter_synapse_action {
> + COUNTER_SYNAPSE_ACTION_NONE,
> + COUNTER_SYNAPSE_ACTION_RISING_EDGE,
> + COUNTER_SYNAPSE_ACTION_FALLING_EDGE,
> + COUNTER_SYNAPSE_ACTION_BOTH_EDGES,
> +};
>
> /**
> - * struct counter_signal_ext - Counter Signal extensions
> - * @name: attribute name
> - * @read: read callback for this attribute; may be NULL
> - * @write: write callback for this attribute; may be NULL
> - * @priv: data private to the driver
> + * struct counter_comp - Counter component node
> + * @type: Counter component data type
> + * @name: device-specific component name
> + * @priv: component-relevant data
> + * @action_read Synapse action mode read callback. The read value of the
> + * respective Synapse action mode should be passed back via
> + * the action parameter.
> + * @device_u8_read Device u8 component read callback. The read value of the
> + * respective Device u8 component should be passed back via
> + * the val parameter.
> + * @count_u8_read Count u8 component read callback. The read value of the
> + * respective Count u8 component should be passed back via
> + * the val parameter.
> + * @signal_u8_read Signal u8 component read callback. The read value of the
> + * respective Signal u8 component should be passed back via
> + * the val parameter.
> + * @device_u32_read Device u32 component read callback. The read value of
> + * the respective De

2021-07-11 10:42:37

by William Breathitt Gray

[permalink] [raw]

Subject: Re: [PATCH v12 11/17] docs: counter: Document character device interface

On Sat, Jul 10, 2021 at 03:15:06PM -0500, David Lechner wrote:
> On 7/5/21 3:18 AM, William Breathitt Gray wrote:
> > This patch adds high-level documentation about the Counter subsystem
> > character device interface.
> >
> > Signed-off-by: William Breathitt Gray <[email protected]>
> > ---
> > Documentation/driver-api/generic-counter.rst | 185 ++++++++++++++----
> > .../userspace-api/ioctl/ioctl-number.rst | 1 +
> > 2 files changed, 145 insertions(+), 41 deletions(-)
> >
> > diff --git a/Documentation/driver-api/generic-counter.rst b/Documentation/driver-api/generic-counter.rst
> > index f6397218aa4c..62a702e7f994 100644
> > --- a/Documentation/driver-api/generic-counter.rst
> > +++ b/Documentation/driver-api/generic-counter.rst
>
>
> > +
> > +Counter Character Device
> > +========================
> > +
> > +Counter character device nodes are created under the ``/dev`` directory
> > +as ``counterX``, where ``X`` is the respective counter device id.
> > +Defines for the standard Counter data types are exposed via the
> > +userspace ``include/uapi/linux/counter.h`` file.
> > +
> > +Counter events
> > +--------------
> > +Counter device drivers can support Counter events by utilizing the
> > +``counter_push_event`` function::
> > +
> > + void counter_push_event(struct counter_device *const counter, const u8 event,
> > + const u8 channel);
> > +
> > +The event id is specified by the ``event`` parameter; the event channel
> > +id is specified by the ``channel`` parameter. When this function is
> > +called, the Counter data associated with the respective event is
> > +gathered, and a ``struct counter_event`` is generated for each datum and
> > +pushed to userspace.
> > +
> > +Counter events can be configured by users to report various Counter
> > +data of interest. This can be conceptualized as a list of Counter
> > +component read calls to perform. For example::
>
> Won't the :: here make this appear as text instead of an HTML table?
>
> (might need to change ~~~ to --- [top line] and === [middle line])

Ack, I'll change this to an HTML table.

> > +
> > + +~~~~~~~~~~~~~~~~~~~~~~~~+~~~~~~~~~~~~~~~~~~~~~~~~+
> > + | COUNTER_EVENT_OVERFLOW | COUNTER_EVENT_INDEX |
> > + +~~~~~~~~~~~~~~~~~~~~~~~~+~~~~~~~~~~~~~~~~~~~~~~~~+
> > + | Channel 0 | Channel 0 |
> > + +------------------------+------------------------+
> > + | * Count 0 | * Signal 0 |
> > + | * Count 1 | * Signal 0 Extension 0 |
> > + | * Signal 3 | * Extension 4 |
> > + | * Count 4 Extension 2 +------------------------+
> > + | * Signal 5 Extension 0 | Channel 1 |
> > + | +------------------------+
> > + | | * Signal 4 |
> > + | | * Signal 4 Extension 0 |
> > + | | * Count 7 |
> > + +------------------------+------------------------+
> > +
> > +When ``counter_push_event(counter, COUNTER_EVENT_INDEX, 1)`` is called
> > +for example, it will go down the list for the ``COUNTER_EVENT_INDEX``
> > +event channel 1 and execute the read callbacks for Signal 4, Signal 4
> > +Extension 0, and Count 4 -- the data returned for each is pushed to a
> > +kfifo as a ``struct counter_event``, which userspace can retrieve via a
> > +standard read operation on the respective character device node.
> > +
> > +Userspace
> > +---------
> > +Userspace applications can configure Counter events via ioctl operations
> > +on the Counter character device node. There following ioctl codes are
> > +supported and provided by the ``linux/counter.h`` userspace header file:
> > +
> > +* COUNTER_ADD_WATCH_IOCTL:
> > + Queues a Counter watch for the specified event. The queued watches
> > + will not be applied until ``COUNTER_ENABLE_EVENTS_IOCTL`` is called.
> > +
> > +* COUNTER_ENABLE_EVENTS_IOCTL:
> > + Enables monitoring the events specified by the Counter watches that
> > + were queued by ``COUNTER_ADD_WATCH_IOCTL``. If events are already
> > + enabled, the new set of watches replaces the old one. Calling this
> > + ioctl also has the effect of clearing the queue of watches added by
> > + ``COUNTER_ADD_WATCH_IOCTL``.
> > +
> > +* COUNTER_DISABLE_EVENTS_IOCTL:
> > + Stops monitoring the previously enabled events.
>
> I wouldn't mind seeing more of this documentation in the actual header
> file and just referenced here with :c:macro:`COUNTER_ADD_WATCH_IOCTL`

Ack.

> > +
> > +To configure events to gather Counter data, users first populate a
> > +``struct counter_watch`` with the relevant event id, event channel id,
> > +and the information for the desired Counter component from which to
> > +read, and then pass it via the ``COUNTER_ADD_WATCH_IOCTL`` ioctl
> > +command.
> > +
> > +Note that an event can be watched without gathering Counter data by
> > +setting the ``component.type`` member equal to
> > +``COUNTER_COMPONENT_NONE``. With this configuration the Counter
> > +character device will simply populate the event timestamps for those
> > +respective ``struct counter_event`` elements and ignore the component
> > +value.
>
> To make sure I am understanding this correctly, scope + parent
> determines this part of the path:
>
> /sys/.../counterX/<scope><parent>/<component>
>
> Or in the case that scope == COUNTER_SCOPE_DEVICE then parent
> is not applicable:
>
> /sys/.../counterX/<component>

Yes, that understanding is correct.

> I suggested parent_id instead of parent earlier, but maybe
> scope_id would be a better name? (Or rename scope to parent_type?)

I can see the benefit of more specific naming, but perhaps the current
names are clear enough when they appear in the context of user code. It
becomes rather obvious in a snippet of code that `component.scope`
refers to the scope type of a component while `component.parent` refers
to the specific parent of the component; I don't think the more verbose
`scope_type`/`parent_type` or `scope_id`/`parent_id` namings really add
much benefit here.

I'm not entirely opposed to renaming this, so if other maintainers also
feel this is better renamed then I'll change it. If we do change the
naming, then remaing `scope` to `scope_type` and `parent` to `parent_id`
might be the way to go; "scope_id" seems strange to me because I
envision `scope` as a type rather than an identifiable component.

William Breathitt Gray

Attachments:

(No filename) (6.58 kB)
signature.asc (849.00 B)
Download all attachments

2021-07-11 11:29:02

(No filename) (14.11 kB)
signature.asc (849.00 B)
Download all attachments