The ucd9000 series chips have gpio pins. Add a gpio chip interface to the ucd
device so that users can query and set the state of the gpio pins.
Add a debugfs interface using the existing pmbus debugfs directory to provide
MFR_STATUS and the status of the gpi faults to users.
Changes since v5:
- enclose gpio code in #ifdef GPIOLIB
- don't initialize buffers for mfr_status; set last char to 0 instead
- cap the size argument to bin2hex
Changes since v4:
- max-sized buffers for smbus transfers
- used bin2hex instead of my own code
Changes since v3:
- remove setting of gpio_chip->owner
- format the mfr_status data
- switch to #ifdef rather than #if IS_ENABLED for debugfs
Changes since v2:
- split the gpio registration into it's own function
Changes since v1:
- dropped dev_err messages
- made gpio chip registration conditional on having gpio pins
- made mfr_status debugfs attribute more simple
Christopher Bostic (2):
hwmon: (ucd9000) Add gpio chip interface
hwmon: (ucd9000) Add debugfs attributes to provide mfr_status
Christopher Bostic (2):
hwmon: (ucd9000) Add gpio chip interface
hwmon: (ucd9000) Add debugfs attributes to provide mfr_status
drivers/hwmon/pmbus/ucd9000.c | 350 +++++++++++++++++++++++++++++++++++++++++-
1 file changed, 349 insertions(+), 1 deletion(-)
--
1.8.3.1
From: Christopher Bostic <[email protected]>
Expose the gpiN_fault fields of mfr_status as individual debugfs
attributes. This provides a way for users to be easily notified of gpi
faults. Also provide the whole mfr_status register in debugfs.
Signed-off-by: Christopher Bostic <[email protected]>
Signed-off-by: Andrew Jeffery <[email protected]>
Signed-off-by: Eddie James <[email protected]>
---
drivers/hwmon/pmbus/ucd9000.c | 138 +++++++++++++++++++++++++++++++++++++++++-
1 file changed, 137 insertions(+), 1 deletion(-)
diff --git a/drivers/hwmon/pmbus/ucd9000.c b/drivers/hwmon/pmbus/ucd9000.c
index ef2c5bf..88c98fb 100644
--- a/drivers/hwmon/pmbus/ucd9000.c
+++ b/drivers/hwmon/pmbus/ucd9000.c
@@ -19,6 +19,7 @@
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
+#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
@@ -37,6 +38,7 @@
#define UCD9000_NUM_PAGES 0xd6
#define UCD9000_FAN_CONFIG_INDEX 0xe7
#define UCD9000_FAN_CONFIG 0xe8
+#define UCD9000_MFR_STATUS 0xf3
#define UCD9000_GPIO_SELECT 0xfa
#define UCD9000_GPIO_CONFIG 0xfb
#define UCD9000_DEVICE_ID 0xfd
@@ -64,15 +66,24 @@
#define UCD901XX_NUM_GPIOS 26
#define UCD90910_NUM_GPIOS 26
+#define UCD9000_DEBUGFS_NAME_LEN 24
+#define UCD9000_GPI_COUNT 8
+
struct ucd9000_data {
u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
struct pmbus_driver_info info;
#ifdef CONFIG_GPIOLIB
struct gpio_chip gpio;
#endif
+ struct dentry *debugfs;
};
#define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)
+struct ucd9000_debugfs_entry {
+ struct i2c_client *client;
+ u8 index;
+};
+
static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
{
int fan_config = 0;
@@ -359,6 +370,122 @@ static void ucd9000_probe_gpio(struct i2c_client *client,
}
#endif /* CONFIG_GPIOLIB */
+#ifdef CONFIG_DEBUG_FS
+static int ucd9000_get_mfr_status(struct i2c_client *client, u8 *buffer)
+{
+ int ret = pmbus_set_page(client, 0);
+
+ if (ret < 0)
+ return ret;
+
+ return i2c_smbus_read_block_data(client, UCD9000_MFR_STATUS, buffer);
+}
+
+static int ucd9000_debugfs_show_mfr_status_bit(void *data, u64 *val)
+{
+ struct ucd9000_debugfs_entry *entry = data;
+ struct i2c_client *client = entry->client;
+ u8 buffer[I2C_SMBUS_BLOCK_MAX];
+ int ret;
+
+ ret = ucd9000_get_mfr_status(client, buffer);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * Attribute only created for devices with gpi fault bits at bits
+ * 16-23, which is the second byte of the response.
+ */
+ *val = !!(buffer[1] & BIT(entry->index));
+
+ return 0;
+}
+DEFINE_DEBUGFS_ATTRIBUTE(ucd9000_debugfs_mfr_status_bit,
+ ucd9000_debugfs_show_mfr_status_bit, NULL, "%1lld\n");
+
+static ssize_t ucd9000_debugfs_read_mfr_status(struct file *file,
+ char __user *buf, size_t count,
+ loff_t *ppos)
+{
+ struct i2c_client *client = file->private_data;
+ u8 buffer[I2C_SMBUS_BLOCK_MAX];
+ char str[(I2C_SMBUS_BLOCK_MAX * 2) + 2];
+ char *res;
+ int rc;
+
+ rc = ucd9000_get_mfr_status(client, buffer);
+ if (rc < 0)
+ return rc;
+
+ res = bin2hex(str, buffer, min(rc, I2C_SMBUS_BLOCK_MAX));
+ *res++ = '\n';
+ *res++ = 0;
+
+ return simple_read_from_buffer(buf, count, ppos, str, res - str);
+}
+
+static const struct file_operations ucd9000_debugfs_show_mfr_status_fops = {
+ .llseek = noop_llseek,
+ .read = ucd9000_debugfs_read_mfr_status,
+ .open = simple_open,
+};
+
+static int ucd9000_init_debugfs(struct i2c_client *client,
+ const struct i2c_device_id *mid,
+ struct ucd9000_data *data)
+{
+ struct dentry *debugfs;
+ struct ucd9000_debugfs_entry *entries;
+ int i;
+ char name[UCD9000_DEBUGFS_NAME_LEN];
+
+ debugfs = pmbus_get_debugfs_dir(client);
+ if (!debugfs)
+ return -ENOENT;
+
+ data->debugfs = debugfs_create_dir(client->name, debugfs);
+ if (!data->debugfs)
+ return -ENOENT;
+
+ /*
+ * Of the chips this driver supports, only the UCD9090, UCD90160,
+ * and UCD90910 report GPI faults in their MFR_STATUS register, so only
+ * create the GPI fault debugfs attributes for those chips.
+ */
+ if (mid->driver_data == ucd9090 || mid->driver_data == ucd90160 ||
+ mid->driver_data == ucd90910) {
+ entries = devm_kzalloc(&client->dev,
+ sizeof(*entries) * UCD9000_GPI_COUNT,
+ GFP_KERNEL);
+ if (!entries)
+ return -ENOMEM;
+
+ for (i = 0; i < UCD9000_GPI_COUNT; i++) {
+ entries[i].client = client;
+ entries[i].index = i;
+ scnprintf(name, UCD9000_DEBUGFS_NAME_LEN,
+ "gpi%d_alarm", i + 1);
+ debugfs_create_file(name, 0444, data->debugfs,
+ &entries[i],
+ &ucd9000_debugfs_mfr_status_bit);
+ }
+ }
+
+ scnprintf(name, UCD9000_DEBUGFS_NAME_LEN, "mfr_status");
+ debugfs_create_file(name, 0444, data->debugfs, client,
+ &ucd9000_debugfs_show_mfr_status_fops);
+
+ return 0;
+}
+#else
+static int ucd9000_init_debugfs(struct i2c_client *client,
+ const struct i2c_device_id *mid,
+ struct ucd9000_data *data)
+{
+ return 0;
+}
+#endif /* CONFIG_DEBUG_FS */
+
static int ucd9000_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -475,7 +602,16 @@ static int ucd9000_probe(struct i2c_client *client,
ucd9000_probe_gpio(client, mid, data);
- return pmbus_do_probe(client, mid, info);
+ ret = pmbus_do_probe(client, mid, info);
+ if (ret)
+ return ret;
+
+ ret = ucd9000_init_debugfs(client, mid, data);
+ if (ret)
+ dev_warn(&client->dev, "Failed to register debugfs: %d\n",
+ ret);
+
+ return 0;
}
/* This is the driver that will be inserted */
--
1.8.3.1
From: Christopher Bostic <[email protected]>
Add a struct gpio_chip and define some methods so that this device's
I/O can be accessed via /sys/class/gpio.
Signed-off-by: Christopher Bostic <[email protected]>
Signed-off-by: Andrew Jeffery <[email protected]>
Signed-off-by: Eddie James <[email protected]>
---
drivers/hwmon/pmbus/ucd9000.c | 212 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 212 insertions(+)
diff --git a/drivers/hwmon/pmbus/ucd9000.c b/drivers/hwmon/pmbus/ucd9000.c
index b74dbec..ef2c5bf 100644
--- a/drivers/hwmon/pmbus/ucd9000.c
+++ b/drivers/hwmon/pmbus/ucd9000.c
@@ -27,6 +27,8 @@
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/pmbus.h>
+#include <linux/gpio.h>
+#include <linux/gpio/driver.h>
#include "pmbus.h"
enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd9090, ucd90910 };
@@ -35,8 +37,18 @@
#define UCD9000_NUM_PAGES 0xd6
#define UCD9000_FAN_CONFIG_INDEX 0xe7
#define UCD9000_FAN_CONFIG 0xe8
+#define UCD9000_GPIO_SELECT 0xfa
+#define UCD9000_GPIO_CONFIG 0xfb
#define UCD9000_DEVICE_ID 0xfd
+/* GPIO CONFIG bits */
+#define UCD9000_GPIO_CONFIG_ENABLE BIT(0)
+#define UCD9000_GPIO_CONFIG_OUT_ENABLE BIT(1)
+#define UCD9000_GPIO_CONFIG_OUT_VALUE BIT(2)
+#define UCD9000_GPIO_CONFIG_STATUS BIT(3)
+#define UCD9000_GPIO_INPUT 0
+#define UCD9000_GPIO_OUTPUT 1
+
#define UCD9000_MON_TYPE(x) (((x) >> 5) & 0x07)
#define UCD9000_MON_PAGE(x) ((x) & 0x0f)
@@ -47,9 +59,17 @@
#define UCD9000_NUM_FAN 4
+#define UCD9000_GPIO_NAME_LEN 16
+#define UCD9090_NUM_GPIOS 23
+#define UCD901XX_NUM_GPIOS 26
+#define UCD90910_NUM_GPIOS 26
+
struct ucd9000_data {
u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
struct pmbus_driver_info info;
+#ifdef CONFIG_GPIOLIB
+ struct gpio_chip gpio;
+#endif
};
#define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)
@@ -149,6 +169,196 @@ static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
};
MODULE_DEVICE_TABLE(of, ucd9000_of_match);
+#ifdef CONFIG_GPIOLIB
+static int ucd9000_gpio_read_config(struct i2c_client *client,
+ unsigned int offset)
+{
+ int ret;
+
+ /* No page set required */
+ ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_SELECT, offset);
+ if (ret < 0)
+ return ret;
+
+ return i2c_smbus_read_byte_data(client, UCD9000_GPIO_CONFIG);
+}
+
+static int ucd9000_gpio_get(struct gpio_chip *gc, unsigned int offset)
+{
+ struct i2c_client *client = gpiochip_get_data(gc);
+ int ret;
+
+ ret = ucd9000_gpio_read_config(client, offset);
+ if (ret < 0)
+ return ret;
+
+ return !!(ret & UCD9000_GPIO_CONFIG_STATUS);
+}
+
+static void ucd9000_gpio_set(struct gpio_chip *gc, unsigned int offset,
+ int value)
+{
+ struct i2c_client *client = gpiochip_get_data(gc);
+ int ret;
+
+ ret = ucd9000_gpio_read_config(client, offset);
+ if (ret < 0) {
+ dev_dbg(&client->dev, "failed to read GPIO %d config: %d\n",
+ offset, ret);
+ return;
+ }
+
+ if (value) {
+ if (ret & UCD9000_GPIO_CONFIG_STATUS)
+ return;
+
+ ret |= UCD9000_GPIO_CONFIG_STATUS;
+ } else {
+ if (!(ret & UCD9000_GPIO_CONFIG_STATUS))
+ return;
+
+ ret &= ~UCD9000_GPIO_CONFIG_STATUS;
+ }
+
+ ret |= UCD9000_GPIO_CONFIG_ENABLE;
+
+ /* Page set not required */
+ ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret);
+ if (ret < 0) {
+ dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n",
+ offset, ret);
+ return;
+ }
+
+ ret &= ~UCD9000_GPIO_CONFIG_ENABLE;
+
+ ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret);
+ if (ret < 0)
+ dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n",
+ offset, ret);
+}
+
+static int ucd9000_gpio_get_direction(struct gpio_chip *gc,
+ unsigned int offset)
+{
+ struct i2c_client *client = gpiochip_get_data(gc);
+ int ret;
+
+ ret = ucd9000_gpio_read_config(client, offset);
+ if (ret < 0)
+ return ret;
+
+ return !(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE);
+}
+
+static int ucd9000_gpio_set_direction(struct gpio_chip *gc,
+ unsigned int offset, bool direction_out,
+ int requested_out)
+{
+ struct i2c_client *client = gpiochip_get_data(gc);
+ int ret, config, out_val;
+
+ ret = ucd9000_gpio_read_config(client, offset);
+ if (ret < 0)
+ return ret;
+
+ if (direction_out) {
+ out_val = requested_out ? UCD9000_GPIO_CONFIG_OUT_VALUE : 0;
+
+ if (ret & UCD9000_GPIO_CONFIG_OUT_ENABLE) {
+ if ((ret & UCD9000_GPIO_CONFIG_OUT_VALUE) == out_val)
+ return 0;
+ } else {
+ ret |= UCD9000_GPIO_CONFIG_OUT_ENABLE;
+ }
+
+ if (out_val)
+ ret |= UCD9000_GPIO_CONFIG_OUT_VALUE;
+ else
+ ret &= ~UCD9000_GPIO_CONFIG_OUT_VALUE;
+
+ } else {
+ if (!(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE))
+ return 0;
+
+ ret &= ~UCD9000_GPIO_CONFIG_OUT_ENABLE;
+ }
+
+ ret |= UCD9000_GPIO_CONFIG_ENABLE;
+ config = ret;
+
+ /* Page set not required */
+ ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config);
+ if (ret < 0)
+ return ret;
+
+ config &= ~UCD9000_GPIO_CONFIG_ENABLE;
+
+ return i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config);
+}
+
+static int ucd9000_gpio_direction_input(struct gpio_chip *gc,
+ unsigned int offset)
+{
+ return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_INPUT, 0);
+}
+
+static int ucd9000_gpio_direction_output(struct gpio_chip *gc,
+ unsigned int offset, int val)
+{
+ return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_OUTPUT,
+ val);
+}
+
+static void ucd9000_probe_gpio(struct i2c_client *client,
+ const struct i2c_device_id *mid,
+ struct ucd9000_data *data)
+{
+ int rc;
+
+ switch (mid->driver_data) {
+ case ucd9090:
+ data->gpio.ngpio = UCD9090_NUM_GPIOS;
+ break;
+ case ucd90120:
+ case ucd90124:
+ case ucd90160:
+ data->gpio.ngpio = UCD901XX_NUM_GPIOS;
+ break;
+ case ucd90910:
+ data->gpio.ngpio = UCD90910_NUM_GPIOS;
+ break;
+ default:
+ return; /* GPIO support is optional. */
+ }
+
+ /*
+ * Pinmux support has not been added to the new gpio_chip.
+ * This support should be added when possible given the mux
+ * behavior of these IO devices.
+ */
+ data->gpio.label = client->name;
+ data->gpio.get_direction = ucd9000_gpio_get_direction;
+ data->gpio.direction_input = ucd9000_gpio_direction_input;
+ data->gpio.direction_output = ucd9000_gpio_direction_output;
+ data->gpio.get = ucd9000_gpio_get;
+ data->gpio.set = ucd9000_gpio_set;
+ data->gpio.can_sleep = true;
+ data->gpio.base = -1;
+ data->gpio.parent = &client->dev;
+
+ rc = devm_gpiochip_add_data(&client->dev, &data->gpio, client);
+ if (rc)
+ dev_warn(&client->dev, "Could not add gpiochip: %d\n", rc);
+}
+#else
+static void ucd9000_probe_gpio(struct i2c_client *client,
+ const struct i2c_device_id *mid,
+ struct ucd9000_data *data)
+{
+}
+#endif /* CONFIG_GPIOLIB */
+
static int ucd9000_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -263,6 +473,8 @@ static int ucd9000_probe(struct i2c_client *client,
| PMBUS_HAVE_FAN34 | PMBUS_HAVE_STATUS_FAN34;
}
+ ucd9000_probe_gpio(client, mid, data);
+
return pmbus_do_probe(client, mid, info);
}
--
1.8.3.1
On Fri, Mar 16, 2018 at 02:25:59PM -0500, Eddie James wrote:
> From: Christopher Bostic <[email protected]>
>
> Expose the gpiN_fault fields of mfr_status as individual debugfs
> attributes. This provides a way for users to be easily notified of gpi
> faults. Also provide the whole mfr_status register in debugfs.
>
> Signed-off-by: Christopher Bostic <[email protected]>
> Signed-off-by: Andrew Jeffery <[email protected]>
> Signed-off-by: Eddie James <[email protected]>
> ---
> drivers/hwmon/pmbus/ucd9000.c | 138 +++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 137 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/hwmon/pmbus/ucd9000.c b/drivers/hwmon/pmbus/ucd9000.c
> index ef2c5bf..88c98fb 100644
> --- a/drivers/hwmon/pmbus/ucd9000.c
> +++ b/drivers/hwmon/pmbus/ucd9000.c
> @@ -19,6 +19,7 @@
> * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
> */
>
> +#include <linux/debugfs.h>
> #include <linux/kernel.h>
> #include <linux/module.h>
> #include <linux/of_device.h>
> @@ -37,6 +38,7 @@
> #define UCD9000_NUM_PAGES 0xd6
> #define UCD9000_FAN_CONFIG_INDEX 0xe7
> #define UCD9000_FAN_CONFIG 0xe8
> +#define UCD9000_MFR_STATUS 0xf3
> #define UCD9000_GPIO_SELECT 0xfa
> #define UCD9000_GPIO_CONFIG 0xfb
> #define UCD9000_DEVICE_ID 0xfd
> @@ -64,15 +66,24 @@
> #define UCD901XX_NUM_GPIOS 26
> #define UCD90910_NUM_GPIOS 26
>
> +#define UCD9000_DEBUGFS_NAME_LEN 24
> +#define UCD9000_GPI_COUNT 8
> +
> struct ucd9000_data {
> u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
> struct pmbus_driver_info info;
> #ifdef CONFIG_GPIOLIB
> struct gpio_chip gpio;
> #endif
> + struct dentry *debugfs;
> };
> #define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)
>
> +struct ucd9000_debugfs_entry {
> + struct i2c_client *client;
> + u8 index;
> +};
> +
> static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
> {
> int fan_config = 0;
> @@ -359,6 +370,122 @@ static void ucd9000_probe_gpio(struct i2c_client *client,
> }
> #endif /* CONFIG_GPIOLIB */
>
> +#ifdef CONFIG_DEBUG_FS
> +static int ucd9000_get_mfr_status(struct i2c_client *client, u8 *buffer)
> +{
> + int ret = pmbus_set_page(client, 0);
> +
> + if (ret < 0)
> + return ret;
> +
> + return i2c_smbus_read_block_data(client, UCD9000_MFR_STATUS, buffer);
> +}
> +
> +static int ucd9000_debugfs_show_mfr_status_bit(void *data, u64 *val)
> +{
> + struct ucd9000_debugfs_entry *entry = data;
> + struct i2c_client *client = entry->client;
> + u8 buffer[I2C_SMBUS_BLOCK_MAX];
> + int ret;
> +
> + ret = ucd9000_get_mfr_status(client, buffer);
> + if (ret < 0)
> + return ret;
> +
> + /*
> + * Attribute only created for devices with gpi fault bits at bits
> + * 16-23, which is the second byte of the response.
> + */
> + *val = !!(buffer[1] & BIT(entry->index));
> +
> + return 0;
> +}
> +DEFINE_DEBUGFS_ATTRIBUTE(ucd9000_debugfs_mfr_status_bit,
> + ucd9000_debugfs_show_mfr_status_bit, NULL, "%1lld\n");
> +
> +static ssize_t ucd9000_debugfs_read_mfr_status(struct file *file,
> + char __user *buf, size_t count,
> + loff_t *ppos)
> +{
> + struct i2c_client *client = file->private_data;
> + u8 buffer[I2C_SMBUS_BLOCK_MAX];
> + char str[(I2C_SMBUS_BLOCK_MAX * 2) + 2];
> + char *res;
> + int rc;
> +
> + rc = ucd9000_get_mfr_status(client, buffer);
> + if (rc < 0)
> + return rc;
> +
> + res = bin2hex(str, buffer, min(rc, I2C_SMBUS_BLOCK_MAX));
> + *res++ = '\n';
> + *res++ = 0;
> +
Unless I am missing something, this now returns the terminating '\0'
to the user. Is this really what you want ?
I see other code adding the terminator, but it doesn't usually return it
to the user.
Guenter
> + return simple_read_from_buffer(buf, count, ppos, str, res - str);
> +}
> +
> +static const struct file_operations ucd9000_debugfs_show_mfr_status_fops = {
> + .llseek = noop_llseek,
> + .read = ucd9000_debugfs_read_mfr_status,
> + .open = simple_open,
> +};
> +
> +static int ucd9000_init_debugfs(struct i2c_client *client,
> + const struct i2c_device_id *mid,
> + struct ucd9000_data *data)
> +{
> + struct dentry *debugfs;
> + struct ucd9000_debugfs_entry *entries;
> + int i;
> + char name[UCD9000_DEBUGFS_NAME_LEN];
> +
> + debugfs = pmbus_get_debugfs_dir(client);
> + if (!debugfs)
> + return -ENOENT;
> +
> + data->debugfs = debugfs_create_dir(client->name, debugfs);
> + if (!data->debugfs)
> + return -ENOENT;
> +
> + /*
> + * Of the chips this driver supports, only the UCD9090, UCD90160,
> + * and UCD90910 report GPI faults in their MFR_STATUS register, so only
> + * create the GPI fault debugfs attributes for those chips.
> + */
> + if (mid->driver_data == ucd9090 || mid->driver_data == ucd90160 ||
> + mid->driver_data == ucd90910) {
> + entries = devm_kzalloc(&client->dev,
> + sizeof(*entries) * UCD9000_GPI_COUNT,
> + GFP_KERNEL);
> + if (!entries)
> + return -ENOMEM;
> +
> + for (i = 0; i < UCD9000_GPI_COUNT; i++) {
> + entries[i].client = client;
> + entries[i].index = i;
> + scnprintf(name, UCD9000_DEBUGFS_NAME_LEN,
> + "gpi%d_alarm", i + 1);
> + debugfs_create_file(name, 0444, data->debugfs,
> + &entries[i],
> + &ucd9000_debugfs_mfr_status_bit);
> + }
> + }
> +
> + scnprintf(name, UCD9000_DEBUGFS_NAME_LEN, "mfr_status");
> + debugfs_create_file(name, 0444, data->debugfs, client,
> + &ucd9000_debugfs_show_mfr_status_fops);
> +
> + return 0;
> +}
> +#else
> +static int ucd9000_init_debugfs(struct i2c_client *client,
> + const struct i2c_device_id *mid,
> + struct ucd9000_data *data)
> +{
> + return 0;
> +}
> +#endif /* CONFIG_DEBUG_FS */
> +
> static int ucd9000_probe(struct i2c_client *client,
> const struct i2c_device_id *id)
> {
> @@ -475,7 +602,16 @@ static int ucd9000_probe(struct i2c_client *client,
>
> ucd9000_probe_gpio(client, mid, data);
>
> - return pmbus_do_probe(client, mid, info);
> + ret = pmbus_do_probe(client, mid, info);
> + if (ret)
> + return ret;
> +
> + ret = ucd9000_init_debugfs(client, mid, data);
> + if (ret)
> + dev_warn(&client->dev, "Failed to register debugfs: %d\n",
> + ret);
> +
> + return 0;
> }
>
> /* This is the driver that will be inserted */
> --
> 1.8.3.1
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-hwmon" in
> the body of a message to [email protected]
> More majordomo info at http://vger.kernel.org/majordomo-info.html
On 03/16/2018 02:59 PM, Guenter Roeck wrote:
> On Fri, Mar 16, 2018 at 02:25:59PM -0500, Eddie James wrote:
>> From: Christopher Bostic <[email protected]>
>>
>> Expose the gpiN_fault fields of mfr_status as individual debugfs
>> attributes. This provides a way for users to be easily notified of gpi
>> faults. Also provide the whole mfr_status register in debugfs.
>>
>> Signed-off-by: Christopher Bostic <[email protected]>
>> Signed-off-by: Andrew Jeffery <[email protected]>
>> Signed-off-by: Eddie James <[email protected]>
>> ---
>> drivers/hwmon/pmbus/ucd9000.c | 138 +++++++++++++++++++++++++++++++++++++++++-
>> 1 file changed, 137 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/hwmon/pmbus/ucd9000.c b/drivers/hwmon/pmbus/ucd9000.c
>> index ef2c5bf..88c98fb 100644
>> --- a/drivers/hwmon/pmbus/ucd9000.c
>> +++ b/drivers/hwmon/pmbus/ucd9000.c
>> @@ -19,6 +19,7 @@
>> * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
>> */
>>
>> +#include <linux/debugfs.h>
>> #include <linux/kernel.h>
>> #include <linux/module.h>
>> #include <linux/of_device.h>
>> @@ -37,6 +38,7 @@
>> #define UCD9000_NUM_PAGES 0xd6
>> #define UCD9000_FAN_CONFIG_INDEX 0xe7
>> #define UCD9000_FAN_CONFIG 0xe8
>> +#define UCD9000_MFR_STATUS 0xf3
>> #define UCD9000_GPIO_SELECT 0xfa
>> #define UCD9000_GPIO_CONFIG 0xfb
>> #define UCD9000_DEVICE_ID 0xfd
>> @@ -64,15 +66,24 @@
>> #define UCD901XX_NUM_GPIOS 26
>> #define UCD90910_NUM_GPIOS 26
>>
>> +#define UCD9000_DEBUGFS_NAME_LEN 24
>> +#define UCD9000_GPI_COUNT 8
>> +
>> struct ucd9000_data {
>> u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
>> struct pmbus_driver_info info;
>> #ifdef CONFIG_GPIOLIB
>> struct gpio_chip gpio;
>> #endif
>> + struct dentry *debugfs;
>> };
>> #define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)
>>
>> +struct ucd9000_debugfs_entry {
>> + struct i2c_client *client;
>> + u8 index;
>> +};
>> +
>> static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
>> {
>> int fan_config = 0;
>> @@ -359,6 +370,122 @@ static void ucd9000_probe_gpio(struct i2c_client *client,
>> }
>> #endif /* CONFIG_GPIOLIB */
>>
>> +#ifdef CONFIG_DEBUG_FS
>> +static int ucd9000_get_mfr_status(struct i2c_client *client, u8 *buffer)
>> +{
>> + int ret = pmbus_set_page(client, 0);
>> +
>> + if (ret < 0)
>> + return ret;
>> +
>> + return i2c_smbus_read_block_data(client, UCD9000_MFR_STATUS, buffer);
>> +}
>> +
>> +static int ucd9000_debugfs_show_mfr_status_bit(void *data, u64 *val)
>> +{
>> + struct ucd9000_debugfs_entry *entry = data;
>> + struct i2c_client *client = entry->client;
>> + u8 buffer[I2C_SMBUS_BLOCK_MAX];
>> + int ret;
>> +
>> + ret = ucd9000_get_mfr_status(client, buffer);
>> + if (ret < 0)
>> + return ret;
>> +
>> + /*
>> + * Attribute only created for devices with gpi fault bits at bits
>> + * 16-23, which is the second byte of the response.
>> + */
>> + *val = !!(buffer[1] & BIT(entry->index));
>> +
>> + return 0;
>> +}
>> +DEFINE_DEBUGFS_ATTRIBUTE(ucd9000_debugfs_mfr_status_bit,
>> + ucd9000_debugfs_show_mfr_status_bit, NULL, "%1lld\n");
>> +
>> +static ssize_t ucd9000_debugfs_read_mfr_status(struct file *file,
>> + char __user *buf, size_t count,
>> + loff_t *ppos)
>> +{
>> + struct i2c_client *client = file->private_data;
>> + u8 buffer[I2C_SMBUS_BLOCK_MAX];
>> + char str[(I2C_SMBUS_BLOCK_MAX * 2) + 2];
>> + char *res;
>> + int rc;
>> +
>> + rc = ucd9000_get_mfr_status(client, buffer);
>> + if (rc < 0)
>> + return rc;
>> +
>> + res = bin2hex(str, buffer, min(rc, I2C_SMBUS_BLOCK_MAX));
>> + *res++ = '\n';
>> + *res++ = 0;
>> +
> Unless I am missing something, this now returns the terminating '\0'
> to the user. Is this really what you want ?
Yes, that was my intention. I thought that was normal. It worked fine
when I cat'ed the file. Up to you, I can change it if you like.
Thanks,
Eddie
>
> I see other code adding the terminator, but it doesn't usually return it
> to the user.
>
> Guenter
>
>> + return simple_read_from_buffer(buf, count, ppos, str, res - str);
>> +}
>> +
>> +static const struct file_operations ucd9000_debugfs_show_mfr_status_fops = {
>> + .llseek = noop_llseek,
>> + .read = ucd9000_debugfs_read_mfr_status,
>> + .open = simple_open,
>> +};
>> +
>> +static int ucd9000_init_debugfs(struct i2c_client *client,
>> + const struct i2c_device_id *mid,
>> + struct ucd9000_data *data)
>> +{
>> + struct dentry *debugfs;
>> + struct ucd9000_debugfs_entry *entries;
>> + int i;
>> + char name[UCD9000_DEBUGFS_NAME_LEN];
>> +
>> + debugfs = pmbus_get_debugfs_dir(client);
>> + if (!debugfs)
>> + return -ENOENT;
>> +
>> + data->debugfs = debugfs_create_dir(client->name, debugfs);
>> + if (!data->debugfs)
>> + return -ENOENT;
>> +
>> + /*
>> + * Of the chips this driver supports, only the UCD9090, UCD90160,
>> + * and UCD90910 report GPI faults in their MFR_STATUS register, so only
>> + * create the GPI fault debugfs attributes for those chips.
>> + */
>> + if (mid->driver_data == ucd9090 || mid->driver_data == ucd90160 ||
>> + mid->driver_data == ucd90910) {
>> + entries = devm_kzalloc(&client->dev,
>> + sizeof(*entries) * UCD9000_GPI_COUNT,
>> + GFP_KERNEL);
>> + if (!entries)
>> + return -ENOMEM;
>> +
>> + for (i = 0; i < UCD9000_GPI_COUNT; i++) {
>> + entries[i].client = client;
>> + entries[i].index = i;
>> + scnprintf(name, UCD9000_DEBUGFS_NAME_LEN,
>> + "gpi%d_alarm", i + 1);
>> + debugfs_create_file(name, 0444, data->debugfs,
>> + &entries[i],
>> + &ucd9000_debugfs_mfr_status_bit);
>> + }
>> + }
>> +
>> + scnprintf(name, UCD9000_DEBUGFS_NAME_LEN, "mfr_status");
>> + debugfs_create_file(name, 0444, data->debugfs, client,
>> + &ucd9000_debugfs_show_mfr_status_fops);
>> +
>> + return 0;
>> +}
>> +#else
>> +static int ucd9000_init_debugfs(struct i2c_client *client,
>> + const struct i2c_device_id *mid,
>> + struct ucd9000_data *data)
>> +{
>> + return 0;
>> +}
>> +#endif /* CONFIG_DEBUG_FS */
>> +
>> static int ucd9000_probe(struct i2c_client *client,
>> const struct i2c_device_id *id)
>> {
>> @@ -475,7 +602,16 @@ static int ucd9000_probe(struct i2c_client *client,
>>
>> ucd9000_probe_gpio(client, mid, data);
>>
>> - return pmbus_do_probe(client, mid, info);
>> + ret = pmbus_do_probe(client, mid, info);
>> + if (ret)
>> + return ret;
>> +
>> + ret = ucd9000_init_debugfs(client, mid, data);
>> + if (ret)
>> + dev_warn(&client->dev, "Failed to register debugfs: %d\n",
>> + ret);
>> +
>> + return 0;
>> }
>>
>> /* This is the driver that will be inserted */
>> --
>> 1.8.3.1
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-hwmon" in
>> the body of a message to [email protected]
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
On Fri, Mar 16, 2018 at 03:04:47PM -0500, Eddie James wrote:
>
>
> On 03/16/2018 02:59 PM, Guenter Roeck wrote:
> >On Fri, Mar 16, 2018 at 02:25:59PM -0500, Eddie James wrote:
> >>From: Christopher Bostic <[email protected]>
> >>
> >>Expose the gpiN_fault fields of mfr_status as individual debugfs
> >>attributes. This provides a way for users to be easily notified of gpi
> >>faults. Also provide the whole mfr_status register in debugfs.
> >>
> >>Signed-off-by: Christopher Bostic <[email protected]>
> >>Signed-off-by: Andrew Jeffery <[email protected]>
> >>Signed-off-by: Eddie James <[email protected]>
> >>---
> >> drivers/hwmon/pmbus/ucd9000.c | 138 +++++++++++++++++++++++++++++++++++++++++-
> >> 1 file changed, 137 insertions(+), 1 deletion(-)
> >>
> >>diff --git a/drivers/hwmon/pmbus/ucd9000.c b/drivers/hwmon/pmbus/ucd9000.c
> >>index ef2c5bf..88c98fb 100644
> >>--- a/drivers/hwmon/pmbus/ucd9000.c
> >>+++ b/drivers/hwmon/pmbus/ucd9000.c
> >>@@ -19,6 +19,7 @@
> >> * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
> >> */
> >>+#include <linux/debugfs.h>
> >> #include <linux/kernel.h>
> >> #include <linux/module.h>
> >> #include <linux/of_device.h>
> >>@@ -37,6 +38,7 @@
> >> #define UCD9000_NUM_PAGES 0xd6
> >> #define UCD9000_FAN_CONFIG_INDEX 0xe7
> >> #define UCD9000_FAN_CONFIG 0xe8
> >>+#define UCD9000_MFR_STATUS 0xf3
> >> #define UCD9000_GPIO_SELECT 0xfa
> >> #define UCD9000_GPIO_CONFIG 0xfb
> >> #define UCD9000_DEVICE_ID 0xfd
> >>@@ -64,15 +66,24 @@
> >> #define UCD901XX_NUM_GPIOS 26
> >> #define UCD90910_NUM_GPIOS 26
> >>+#define UCD9000_DEBUGFS_NAME_LEN 24
> >>+#define UCD9000_GPI_COUNT 8
> >>+
> >> struct ucd9000_data {
> >> u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
> >> struct pmbus_driver_info info;
> >> #ifdef CONFIG_GPIOLIB
> >> struct gpio_chip gpio;
> >> #endif
> >>+ struct dentry *debugfs;
> >> };
> >> #define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)
> >>+struct ucd9000_debugfs_entry {
> >>+ struct i2c_client *client;
> >>+ u8 index;
> >>+};
> >>+
> >> static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
> >> {
> >> int fan_config = 0;
> >>@@ -359,6 +370,122 @@ static void ucd9000_probe_gpio(struct i2c_client *client,
> >> }
> >> #endif /* CONFIG_GPIOLIB */
> >>+#ifdef CONFIG_DEBUG_FS
> >>+static int ucd9000_get_mfr_status(struct i2c_client *client, u8 *buffer)
> >>+{
> >>+ int ret = pmbus_set_page(client, 0);
> >>+
> >>+ if (ret < 0)
> >>+ return ret;
> >>+
> >>+ return i2c_smbus_read_block_data(client, UCD9000_MFR_STATUS, buffer);
> >>+}
> >>+
> >>+static int ucd9000_debugfs_show_mfr_status_bit(void *data, u64 *val)
> >>+{
> >>+ struct ucd9000_debugfs_entry *entry = data;
> >>+ struct i2c_client *client = entry->client;
> >>+ u8 buffer[I2C_SMBUS_BLOCK_MAX];
> >>+ int ret;
> >>+
> >>+ ret = ucd9000_get_mfr_status(client, buffer);
> >>+ if (ret < 0)
> >>+ return ret;
> >>+
> >>+ /*
> >>+ * Attribute only created for devices with gpi fault bits at bits
> >>+ * 16-23, which is the second byte of the response.
> >>+ */
> >>+ *val = !!(buffer[1] & BIT(entry->index));
> >>+
> >>+ return 0;
> >>+}
> >>+DEFINE_DEBUGFS_ATTRIBUTE(ucd9000_debugfs_mfr_status_bit,
> >>+ ucd9000_debugfs_show_mfr_status_bit, NULL, "%1lld\n");
> >>+
> >>+static ssize_t ucd9000_debugfs_read_mfr_status(struct file *file,
> >>+ char __user *buf, size_t count,
> >>+ loff_t *ppos)
> >>+{
> >>+ struct i2c_client *client = file->private_data;
> >>+ u8 buffer[I2C_SMBUS_BLOCK_MAX];
> >>+ char str[(I2C_SMBUS_BLOCK_MAX * 2) + 2];
> >>+ char *res;
> >>+ int rc;
> >>+
> >>+ rc = ucd9000_get_mfr_status(client, buffer);
> >>+ if (rc < 0)
> >>+ return rc;
> >>+
> >>+ res = bin2hex(str, buffer, min(rc, I2C_SMBUS_BLOCK_MAX));
> >>+ *res++ = '\n';
> >>+ *res++ = 0;
> >>+
> >Unless I am missing something, this now returns the terminating '\0'
> >to the user. Is this really what you want ?
>
> Yes, that was my intention. I thought that was normal. It worked fine when I
> cat'ed the file. Up to you, I can change it if you like.
>
Please do. I suspect that you'll see the '\0' if you send the output to od.
That is unexpected. I browsed through the kernel and was unable to find
any other code doing the same, so we should not be the ones starting it.
Example is DEFINE_DEBUGFS_ATTRIBUTE, which ends up calling simple_attr_read().
This in turn passes the result of scnprintf() or strlen() to
simple_read_from_buffer(). Both not include the terminating '\0'.
Thanks,
Guenter
> Thanks,
> Eddie
>
> >
> >I see other code adding the terminator, but it doesn't usually return it
> >to the user.
> >
> >Guenter
> >
> >>+ return simple_read_from_buffer(buf, count, ppos, str, res - str);
> >>+}
> >>+
> >>+static const struct file_operations ucd9000_debugfs_show_mfr_status_fops = {
> >>+ .llseek = noop_llseek,
> >>+ .read = ucd9000_debugfs_read_mfr_status,
> >>+ .open = simple_open,
> >>+};
> >>+
> >>+static int ucd9000_init_debugfs(struct i2c_client *client,
> >>+ const struct i2c_device_id *mid,
> >>+ struct ucd9000_data *data)
> >>+{
> >>+ struct dentry *debugfs;
> >>+ struct ucd9000_debugfs_entry *entries;
> >>+ int i;
> >>+ char name[UCD9000_DEBUGFS_NAME_LEN];
> >>+
> >>+ debugfs = pmbus_get_debugfs_dir(client);
> >>+ if (!debugfs)
> >>+ return -ENOENT;
> >>+
> >>+ data->debugfs = debugfs_create_dir(client->name, debugfs);
> >>+ if (!data->debugfs)
> >>+ return -ENOENT;
> >>+
> >>+ /*
> >>+ * Of the chips this driver supports, only the UCD9090, UCD90160,
> >>+ * and UCD90910 report GPI faults in their MFR_STATUS register, so only
> >>+ * create the GPI fault debugfs attributes for those chips.
> >>+ */
> >>+ if (mid->driver_data == ucd9090 || mid->driver_data == ucd90160 ||
> >>+ mid->driver_data == ucd90910) {
> >>+ entries = devm_kzalloc(&client->dev,
> >>+ sizeof(*entries) * UCD9000_GPI_COUNT,
> >>+ GFP_KERNEL);
> >>+ if (!entries)
> >>+ return -ENOMEM;
> >>+
> >>+ for (i = 0; i < UCD9000_GPI_COUNT; i++) {
> >>+ entries[i].client = client;
> >>+ entries[i].index = i;
> >>+ scnprintf(name, UCD9000_DEBUGFS_NAME_LEN,
> >>+ "gpi%d_alarm", i + 1);
> >>+ debugfs_create_file(name, 0444, data->debugfs,
> >>+ &entries[i],
> >>+ &ucd9000_debugfs_mfr_status_bit);
> >>+ }
> >>+ }
> >>+
> >>+ scnprintf(name, UCD9000_DEBUGFS_NAME_LEN, "mfr_status");
> >>+ debugfs_create_file(name, 0444, data->debugfs, client,
> >>+ &ucd9000_debugfs_show_mfr_status_fops);
> >>+
> >>+ return 0;
> >>+}
> >>+#else
> >>+static int ucd9000_init_debugfs(struct i2c_client *client,
> >>+ const struct i2c_device_id *mid,
> >>+ struct ucd9000_data *data)
> >>+{
> >>+ return 0;
> >>+}
> >>+#endif /* CONFIG_DEBUG_FS */
> >>+
> >> static int ucd9000_probe(struct i2c_client *client,
> >> const struct i2c_device_id *id)
> >> {
> >>@@ -475,7 +602,16 @@ static int ucd9000_probe(struct i2c_client *client,
> >> ucd9000_probe_gpio(client, mid, data);
> >>- return pmbus_do_probe(client, mid, info);
> >>+ ret = pmbus_do_probe(client, mid, info);
> >>+ if (ret)
> >>+ return ret;
> >>+
> >>+ ret = ucd9000_init_debugfs(client, mid, data);
> >>+ if (ret)
> >>+ dev_warn(&client->dev, "Failed to register debugfs: %d\n",
> >>+ ret);
> >>+
> >>+ return 0;
> >> }
> >> /* This is the driver that will be inserted */
> >>--
> >>1.8.3.1
> >>
> >>--
> >>To unsubscribe from this list: send the line "unsubscribe linux-hwmon" in
> >>the body of a message to [email protected]
> >>More majordomo info at http://vger.kernel.org/majordomo-info.html
>