Changelog v3 -> v4:
* patch 'docs: ioctl-number.rst: reserve IIO subsystem ioctl() space'
remove 'uapi/' from `uapi/linux/iio/*.h`
* patch 'iio: core: register chardev only if needed'
add commit comment about potentially breaking userspace ABI with chardev removal
* patch 'iio: core: rework iio device group creation'
remove NULL re-init in iio_device_unregister_sysfs() ; memory is being free'd
* patch 'iio: buffer: group attr count and attr alloc'
extend commit comment about the 2 or 1 buffer directores
* patch 'iio: core: merge buffer/ & scan_elements/ attributes'
fixed static checker complaints
- removed unused global
- initialize omitted 'ret = -ENOMEM' on error path
- made iio_buffer_unregister_legacy_sysfs_groups() static
* patch 'iio: buffer: wrap all buffer attributes into iio_dev_attr'
- update some omitted unwindings; seems i forgot a few originally
this was showing up when trying to read from buffer1
* add patch 'iio: buffer: move __iio_buffer_free_sysfs_and_mask() before alloc func'
* patch 'iio: buffer: introduce support for attaching more IIO buffers'
- removed 'iio_dev_opaque->attached_buffers = NULL' after kfree()
- using 'iio_dev_opaque->attached_buffers_cnt' to check that we have buffers
instead of checking 'indio_dev->buffer'
* patch 'iio: buffer: add ioctl() to support opening extra buffers for IIO device'
- replaced -ENOENT with -ENODEV when buffer index is out of range
* add 'iio: core: rename 'dev' -> 'indio_dev' in iio_device_alloc()'
* add 'iio: buffer: dmaengine: obtain buffer object from attribute'
* add tools/iio patches for new multibuffer logic
tools: iio: make iioutils_get_type() private in iio_utils
tools: iio: privatize globals and functions in iio_generic_buffer.c file
tools: iio: convert iio_generic_buffer to use new IIO buffer API
Alexandru Ardelean (17):
docs: ioctl-number.rst: reserve IIO subsystem ioctl() space
iio: core: register chardev only if needed
iio: core-trigger: make iio_device_register_trigger_consumer() an int
return
iio: core: rework iio device group creation
iio: buffer: group attr count and attr alloc
iio: core: merge buffer/ & scan_elements/ attributes
iio: add reference to iio buffer on iio_dev_attr
iio: buffer: wrap all buffer attributes into iio_dev_attr
iio: buffer: dmaengine: obtain buffer object from attribute
iio: core: wrap iio device & buffer into struct for character devices
iio: buffer: move __iio_buffer_free_sysfs_and_mask() before alloc
iio: buffer: introduce support for attaching more IIO buffers
iio: buffer: add ioctl() to support opening extra buffers for IIO
device
iio: core: rename 'dev' -> 'indio_dev' in iio_device_alloc()
tools: iio: make iioutils_get_type() private in iio_utils
tools: iio: privatize globals and functions in iio_generic_buffer.c
file
tools: iio: convert iio_generic_buffer to use new IIO buffer API
.../userspace-api/ioctl/ioctl-number.rst | 1 +
.../buffer/industrialio-buffer-dmaengine.c | 3 +-
drivers/iio/iio_core.h | 24 +-
drivers/iio/iio_core_trigger.h | 4 +-
drivers/iio/industrialio-buffer.c | 483 ++++++++++++++----
drivers/iio/industrialio-core.c | 108 +++-
drivers/iio/industrialio-event.c | 6 +-
drivers/iio/industrialio-trigger.c | 6 +-
include/linux/iio/buffer.h | 4 +-
include/linux/iio/buffer_impl.h | 21 +-
include/linux/iio/iio-opaque.h | 14 +
include/linux/iio/iio.h | 5 -
include/linux/iio/sysfs.h | 3 +
include/uapi/linux/iio/buffer.h | 10 +
tools/iio/Makefile | 1 +
tools/iio/iio_generic_buffer.c | 133 +++--
tools/iio/iio_utils.c | 18 +-
tools/iio/iio_utils.h | 8 +-
18 files changed, 658 insertions(+), 194 deletions(-)
create mode 100644 include/uapi/linux/iio/buffer.h
--
2.17.1
The __iio_buffer_free_sysfs_and_mask() function will be used in
iio_buffer_alloc_sysfs_and_mask() when multiple buffers will be attached to
the IIO device.
This will need to be used to cleanup resources on each buffer, when the
buffers cleanup unwind will occur on the error path.
The move is done in this patch to make the patch that adds multiple buffers
per IIO device a bit cleaner.
Signed-off-by: Alexandru Ardelean <[email protected]>
---
drivers/iio/industrialio-buffer.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index a6148ed24e41..209b3a32bdbb 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -1443,6 +1443,14 @@ static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer,
return ret;
}
+static void __iio_buffer_free_sysfs_and_mask(struct iio_buffer *buffer)
+{
+ bitmap_free(buffer->scan_mask);
+ kfree(buffer->buffer_group.name);
+ kfree(buffer->buffer_group.attrs);
+ iio_free_chan_devattr_list(&buffer->buffer_attr_list);
+}
+
int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
{
struct iio_buffer *buffer = indio_dev->buffer;
@@ -1464,14 +1472,6 @@ int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
return __iio_buffer_alloc_sysfs_and_mask(buffer, indio_dev, 0);
}
-static void __iio_buffer_free_sysfs_and_mask(struct iio_buffer *buffer)
-{
- bitmap_free(buffer->scan_mask);
- kfree(buffer->buffer_group.name);
- kfree(buffer->buffer_group.attrs);
- iio_free_chan_devattr_list(&buffer->buffer_attr_list);
-}
-
void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev)
{
struct iio_buffer *buffer = indio_dev->buffer;
--
2.17.1
The 'dev' variable name usually refers to 'struct device' types. However in
iio_device_alloc() this was used for the 'struct iio_dev' type, which was
sometimes causing minor confusions.
This change renames the variable to 'indio_dev', which is the usual name
used around IIO for 'struct iio_dev' type objects.
It makes grepping a bit easier as well.
Signed-off-by: Alexandru Ardelean <[email protected]>
---
drivers/iio/industrialio-core.c | 28 ++++++++++++++--------------
1 file changed, 14 insertions(+), 14 deletions(-)
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index febb3a0d91f3..86ddc752ea96 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -1602,7 +1602,7 @@ struct device_type iio_device_type = {
struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv)
{
struct iio_dev_opaque *iio_dev_opaque;
- struct iio_dev *dev;
+ struct iio_dev *indio_dev;
size_t alloc_size;
alloc_size = sizeof(struct iio_dev_opaque);
@@ -1615,31 +1615,31 @@ struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv)
if (!iio_dev_opaque)
return NULL;
- dev = &iio_dev_opaque->indio_dev;
- dev->priv = (char *)iio_dev_opaque +
+ indio_dev = &iio_dev_opaque->indio_dev;
+ indio_dev->priv = (char *)iio_dev_opaque +
ALIGN(sizeof(struct iio_dev_opaque), IIO_ALIGN);
- dev->dev.parent = parent;
- dev->dev.type = &iio_device_type;
- dev->dev.bus = &iio_bus_type;
- device_initialize(&dev->dev);
- dev_set_drvdata(&dev->dev, (void *)dev);
- mutex_init(&dev->mlock);
- mutex_init(&dev->info_exist_lock);
+ indio_dev->dev.parent = parent;
+ indio_dev->dev.type = &iio_device_type;
+ indio_dev->dev.bus = &iio_bus_type;
+ device_initialize(&indio_dev->dev);
+ dev_set_drvdata(&indio_dev->dev, (void *)indio_dev);
+ mutex_init(&indio_dev->mlock);
+ mutex_init(&indio_dev->info_exist_lock);
INIT_LIST_HEAD(&iio_dev_opaque->channel_attr_list);
- dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
- if (dev->id < 0) {
+ indio_dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
+ if (indio_dev->id < 0) {
/* cannot use a dev_err as the name isn't available */
pr_err("failed to get device id\n");
kfree(iio_dev_opaque);
return NULL;
}
- dev_set_name(&dev->dev, "iio:device%d", dev->id);
+ dev_set_name(&indio_dev->dev, "iio:device%d", indio_dev->id);
INIT_LIST_HEAD(&iio_dev_opaque->buffer_list);
INIT_LIST_HEAD(&iio_dev_opaque->ioctl_handlers);
- return dev;
+ return indio_dev;
}
EXPORT_SYMBOL(iio_device_alloc);
--
2.17.1
This change wraps all buffer attributes into iio_dev_attr objects, and
assigns a reference to the IIO buffer they belong to.
With the addition of multiple IIO buffers per one IIO device, we need a way
to know which IIO buffer is being enabled/disabled/controlled.
We know that all buffer attributes are device_attributes. So we can wrap
them with a iio_dev_attr types. In the iio_dev_attr type, we can also hold
a reference to an IIO buffer.
So, we end up being able to allocate wrapped attributes for all buffer
attributes (even the one from other drivers).
The neat part with this mechanism, is that we don't need to add any extra
cleanup, because these attributes are being added to a dynamic list that
will get cleaned up via iio_free_chan_devattr_list().
With this change, the 'buffer->scan_el_dev_attr_list' list is being renamed
to 'buffer->buffer_attr_list', effectively merging (or finalizing the
merge) of the buffer/ & scan_elements/ attributes internally.
Accessing these new buffer attributes can now be done via
'to_iio_dev_attr(attr)->buffer' inside the show/store handlers.
Signed-off-by: Alexandru Ardelean <[email protected]>
---
drivers/iio/industrialio-buffer.c | 76 ++++++++++++++++++++-----------
include/linux/iio/buffer_impl.h | 4 +-
2 files changed, 52 insertions(+), 28 deletions(-)
diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index 530b8697f3d8..d79d81485a3f 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -253,8 +253,7 @@ static ssize_t iio_scan_el_show(struct device *dev,
char *buf)
{
int ret;
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct iio_buffer *buffer = indio_dev->buffer;
+ struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer;
/* Ensure ret is 0 or 1. */
ret = !!test_bit(to_iio_dev_attr(attr)->address,
@@ -367,8 +366,8 @@ static ssize_t iio_scan_el_store(struct device *dev,
int ret;
bool state;
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct iio_buffer *buffer = indio_dev->buffer;
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ struct iio_buffer *buffer = this_attr->buffer;
ret = strtobool(buf, &state);
if (ret < 0)
@@ -402,8 +401,7 @@ static ssize_t iio_scan_el_ts_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct iio_buffer *buffer = indio_dev->buffer;
+ struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer;
return sprintf(buf, "%d\n", buffer->scan_timestamp);
}
@@ -415,7 +413,7 @@ static ssize_t iio_scan_el_ts_store(struct device *dev,
{
int ret;
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct iio_buffer *buffer = indio_dev->buffer;
+ struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer;
bool state;
ret = strtobool(buf, &state);
@@ -448,7 +446,7 @@ static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev,
IIO_SEPARATE,
&indio_dev->dev,
buffer,
- &buffer->scan_el_dev_attr_list);
+ &buffer->buffer_attr_list);
if (ret)
return ret;
attrcount++;
@@ -460,7 +458,7 @@ static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev,
0,
&indio_dev->dev,
buffer,
- &buffer->scan_el_dev_attr_list);
+ &buffer->buffer_attr_list);
if (ret)
return ret;
attrcount++;
@@ -473,7 +471,7 @@ static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev,
0,
&indio_dev->dev,
buffer,
- &buffer->scan_el_dev_attr_list);
+ &buffer->buffer_attr_list);
else
ret = __iio_add_chan_devattr("en",
chan,
@@ -483,7 +481,7 @@ static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev,
0,
&indio_dev->dev,
buffer,
- &buffer->scan_el_dev_attr_list);
+ &buffer->buffer_attr_list);
if (ret)
return ret;
attrcount++;
@@ -495,8 +493,7 @@ static ssize_t iio_buffer_read_length(struct device *dev,
struct device_attribute *attr,
char *buf)
{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct iio_buffer *buffer = indio_dev->buffer;
+ struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer;
return sprintf(buf, "%d\n", buffer->length);
}
@@ -506,7 +503,7 @@ static ssize_t iio_buffer_write_length(struct device *dev,
const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct iio_buffer *buffer = indio_dev->buffer;
+ struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer;
unsigned int val;
int ret;
@@ -538,8 +535,7 @@ static ssize_t iio_buffer_show_enable(struct device *dev,
struct device_attribute *attr,
char *buf)
{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct iio_buffer *buffer = indio_dev->buffer;
+ struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer;
return sprintf(buf, "%d\n", iio_buffer_is_active(buffer));
}
@@ -1154,7 +1150,7 @@ static ssize_t iio_buffer_store_enable(struct device *dev,
int ret;
bool requested_state;
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct iio_buffer *buffer = indio_dev->buffer;
+ struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer;
bool inlist;
ret = strtobool(buf, &requested_state);
@@ -1183,8 +1179,7 @@ static ssize_t iio_buffer_show_watermark(struct device *dev,
struct device_attribute *attr,
char *buf)
{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct iio_buffer *buffer = indio_dev->buffer;
+ struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer;
return sprintf(buf, "%u\n", buffer->watermark);
}
@@ -1195,7 +1190,7 @@ static ssize_t iio_buffer_store_watermark(struct device *dev,
size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct iio_buffer *buffer = indio_dev->buffer;
+ struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer;
unsigned int val;
int ret;
@@ -1228,8 +1223,7 @@ static ssize_t iio_dma_show_data_available(struct device *dev,
struct device_attribute *attr,
char *buf)
{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct iio_buffer *buffer = indio_dev->buffer;
+ struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer;
return sprintf(buf, "%zu\n", iio_buffer_data_available(buffer));
}
@@ -1254,6 +1248,26 @@ static struct attribute *iio_buffer_attrs[] = {
&dev_attr_data_available.attr,
};
+#define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr)
+
+static struct attribute *iio_buffer_wrap_attr(struct iio_buffer *buffer,
+ struct attribute *attr)
+{
+ struct device_attribute *dattr = to_dev_attr(attr);
+ struct iio_dev_attr *iio_attr;
+
+ iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL);
+ if (!iio_attr)
+ return NULL;
+
+ iio_attr->buffer = buffer;
+ memcpy(&iio_attr->dev_attr, dattr, sizeof(iio_attr->dev_attr));
+
+ list_add(&iio_attr->l, &buffer->buffer_attr_list);
+
+ return &iio_attr->dev_attr.attr;
+}
+
static int iio_buffer_register_legacy_sysfs_groups(struct iio_dev *indio_dev,
struct attribute **buffer_attrs,
int buffer_attrcount,
@@ -1329,7 +1343,7 @@ static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer,
}
scan_el_attrcount = 0;
- INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list);
+ INIT_LIST_HEAD(&buffer->buffer_attr_list);
channels = indio_dev->channels;
if (channels) {
/* new magic */
@@ -1376,9 +1390,19 @@ static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer,
buffer_attrcount += ARRAY_SIZE(iio_buffer_attrs);
- attrn = buffer_attrcount;
+ for (i = 0; i < buffer_attrcount; i++) {
+ struct attribute *wrapped;
+
+ wrapped = iio_buffer_wrap_attr(buffer, attr[i]);
+ if (!wrapped) {
+ ret = -ENOMEM;
+ goto error_free_scan_mask;
+ }
+ attr[i] = wrapped;
+ }
- list_for_each_entry(p, &buffer->scan_el_dev_attr_list, l)
+ attrn = 0;
+ list_for_each_entry(p, &buffer->buffer_attr_list, l)
attr[attrn++] = &p->dev_attr.attr;
buffer->buffer_group.name = kasprintf(GFP_KERNEL, "buffer%d", index);
@@ -1412,7 +1436,7 @@ static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer,
error_free_scan_mask:
bitmap_free(buffer->scan_mask);
error_cleanup_dynamic:
- iio_free_chan_devattr_list(&buffer->scan_el_dev_attr_list);
+ iio_free_chan_devattr_list(&buffer->buffer_attr_list);
return ret;
}
@@ -1443,7 +1467,7 @@ static void __iio_buffer_free_sysfs_and_mask(struct iio_buffer *buffer)
bitmap_free(buffer->scan_mask);
kfree(buffer->buffer_group.name);
kfree(buffer->buffer_group.attrs);
- iio_free_chan_devattr_list(&buffer->scan_el_dev_attr_list);
+ iio_free_chan_devattr_list(&buffer->buffer_attr_list);
}
void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev)
diff --git a/include/linux/iio/buffer_impl.h b/include/linux/iio/buffer_impl.h
index 3e555e58475b..41044320e581 100644
--- a/include/linux/iio/buffer_impl.h
+++ b/include/linux/iio/buffer_impl.h
@@ -97,8 +97,8 @@ struct iio_buffer {
/* @scan_timestamp: Does the scan mode include a timestamp. */
bool scan_timestamp;
- /* @scan_el_dev_attr_list: List of scan element related attributes. */
- struct list_head scan_el_dev_attr_list;
+ /* @buffer_attr_list: List of buffer attributes. */
+ struct list_head buffer_attr_list;
/*
* @buffer_group: Attributes of the new buffer group.
--
2.17.1
This change makes use of the new IIO buffer API to read data from an IIO
buffer.
It doesn't read the /sys/bus/iio/devices/iio:deviceX/scan_elements dir
anymore, it reads /sys/bus/iio/devices/iio:deviceX/bufferY, where all the
scan_elements have been merged together with the old/classical buffer
attributes.
And it makes use of the new IIO_BUFFER_GET_FD_IOCTL ioctl to get an FD for
the IIO buffer for which to read data from.
It also does a quick sanity check to see that -EBUSY is returned if reading
the chardev after the ioctl() has succeeded.
This was tested with the following cases:
1. Tested buffer0 works with ioctl()
2. Tested that buffer0 can't be opened via /dev/iio:deviceX after ioctl()
3. Moved valid buffer0 to be buffer1, and tested that data comes from it
Signed-off-by: Alexandru Ardelean <[email protected]>
---
tools/iio/Makefile | 1 +
tools/iio/iio_generic_buffer.c | 102 +++++++++++++++++++++++++++------
tools/iio/iio_utils.c | 13 +++--
tools/iio/iio_utils.h | 4 +-
4 files changed, 96 insertions(+), 24 deletions(-)
diff --git a/tools/iio/Makefile b/tools/iio/Makefile
index 3de763d9ab70..5d12ac4e7f8f 100644
--- a/tools/iio/Makefile
+++ b/tools/iio/Makefile
@@ -27,6 +27,7 @@ include $(srctree)/tools/build/Makefile.include
#
$(OUTPUT)include/linux/iio: ../../include/uapi/linux/iio
mkdir -p $(OUTPUT)include/linux/iio 2>&1 || true
+ ln -sf $(CURDIR)/../../include/uapi/linux/iio/buffer.h $@
ln -sf $(CURDIR)/../../include/uapi/linux/iio/events.h $@
ln -sf $(CURDIR)/../../include/uapi/linux/iio/types.h $@
diff --git a/tools/iio/iio_generic_buffer.c b/tools/iio/iio_generic_buffer.c
index 7c7240553777..c796a1d9ed20 100644
--- a/tools/iio/iio_generic_buffer.c
+++ b/tools/iio/iio_generic_buffer.c
@@ -30,6 +30,8 @@
#include <inttypes.h>
#include <stdbool.h>
#include <signal.h>
+#include <sys/ioctl.h>
+#include <linux/iio/buffer.h>
#include "iio_utils.h"
/**
@@ -197,7 +199,7 @@ static void process_scan(char *data, struct iio_channel_info *channels,
printf("\n");
}
-static int enable_disable_all_channels(char *dev_dir_name, int enable)
+static int enable_disable_all_channels(char *dev_dir_name, int buffer_idx, int enable)
{
const struct dirent *ent;
char scanelemdir[256];
@@ -205,7 +207,7 @@ static int enable_disable_all_channels(char *dev_dir_name, int enable)
int ret;
snprintf(scanelemdir, sizeof(scanelemdir),
- FORMAT_SCAN_ELEMENTS_DIR, dev_dir_name);
+ FORMAT_SCAN_ELEMENTS_DIR, dev_dir_name, buffer_idx);
scanelemdir[sizeof(scanelemdir)-1] = '\0';
dp = opendir(scanelemdir);
@@ -243,6 +245,7 @@ static void print_usage(void)
"Capture, convert and output data from IIO device buffer\n"
" -a Auto-activate all available channels\n"
" -A Force-activate ALL channels\n"
+ " -b <n> The buffer which to open (by index), default 0\n"
" -c <n> Do n conversions, or loop forever if n < 0\n"
" -e Disable wait for event (new data)\n"
" -g Use trigger-less mode\n"
@@ -259,6 +262,7 @@ static void print_usage(void)
static enum autochan autochannels = AUTOCHANNELS_DISABLED;
static char *dev_dir_name = NULL;
static char *buf_dir_name = NULL;
+static int buffer_idx = 0;
static bool current_trigger_set = false;
static void cleanup(void)
@@ -286,7 +290,7 @@ static void cleanup(void)
/* Disable channels if auto-enabled */
if (dev_dir_name && autochannels == AUTOCHANNELS_ACTIVE) {
- ret = enable_disable_all_channels(dev_dir_name, 0);
+ ret = enable_disable_all_channels(dev_dir_name, buffer_idx, 0);
if (ret)
fprintf(stderr, "Failed to disable all channels\n");
autochannels = AUTOCHANNELS_DISABLED;
@@ -333,7 +337,9 @@ int main(int argc, char **argv)
unsigned long long j;
unsigned long toread;
int ret, c;
- int fp = -1;
+ struct stat st;
+ int fd = -1;
+ int buf_fd = -1;
int num_channels = 0;
char *trigger_name = NULL, *device_name = NULL;
@@ -352,7 +358,7 @@ int main(int argc, char **argv)
register_cleanup();
- while ((c = getopt_long(argc, argv, "aAc:egl:n:N:t:T:w:?", longopts,
+ while ((c = getopt_long(argc, argv, "aAb:c:egl:n:N:t:T:w:?", longopts,
NULL)) != -1) {
switch (c) {
case 'a':
@@ -361,7 +367,20 @@ int main(int argc, char **argv)
case 'A':
autochannels = AUTOCHANNELS_ENABLED;
force_autochannels = true;
- break;
+ break;
+ case 'b':
+ errno = 0;
+ buffer_idx = strtoll(optarg, &dummy, 10);
+ if (errno) {
+ ret = -errno;
+ goto error;
+ }
+ if (buffer_idx < 0) {
+ ret = -ERANGE;
+ goto error;
+ }
+
+ break;
case 'c':
errno = 0;
num_loops = strtoll(optarg, &dummy, 10);
@@ -518,7 +537,7 @@ int main(int argc, char **argv)
* Parse the files in scan_elements to identify what channels are
* present
*/
- ret = build_channel_array(dev_dir_name, &channels, &num_channels);
+ ret = build_channel_array(dev_dir_name, buffer_idx, &channels, &num_channels);
if (ret) {
fprintf(stderr, "Problem reading scan element information\n"
"diag %s\n", dev_dir_name);
@@ -535,7 +554,7 @@ int main(int argc, char **argv)
(autochannels == AUTOCHANNELS_ENABLED && force_autochannels)) {
fprintf(stderr, "Enabling all channels\n");
- ret = enable_disable_all_channels(dev_dir_name, 1);
+ ret = enable_disable_all_channels(dev_dir_name, buffer_idx, 1);
if (ret) {
fprintf(stderr, "Failed to enable all channels\n");
goto error;
@@ -544,7 +563,7 @@ int main(int argc, char **argv)
/* This flags that we need to disable the channels again */
autochannels = AUTOCHANNELS_ACTIVE;
- ret = build_channel_array(dev_dir_name, &channels,
+ ret = build_channel_array(dev_dir_name, buffer_idx, &channels,
&num_channels);
if (ret) {
fprintf(stderr, "Problem reading scan element "
@@ -565,7 +584,7 @@ int main(int argc, char **argv)
fprintf(stderr, "Enable channels manually in "
FORMAT_SCAN_ELEMENTS_DIR
"/*_en or pass -a to autoenable channels and "
- "try again.\n", dev_dir_name);
+ "try again.\n", dev_dir_name, buffer_idx);
ret = -ENOENT;
goto error;
}
@@ -576,12 +595,25 @@ int main(int argc, char **argv)
* be built rather than found.
*/
ret = asprintf(&buf_dir_name,
- "%siio:device%d/buffer", iio_dir, dev_num);
+ "%siio:device%d/buffer%d", iio_dir, dev_num, buffer_idx);
if (ret < 0) {
ret = -ENOMEM;
goto error;
}
+ if (stat(buf_dir_name, &st)) {
+ fprintf(stderr, "Could not stat() '%s', got error %d: %s\n",
+ buf_dir_name, errno, strerror(errno));
+ ret = -errno;
+ goto error;
+ }
+
+ if (!S_ISDIR(st.st_mode)) {
+ fprintf(stderr, "File '%s' is not a directory\n", buf_dir_name);
+ ret = -EFAULT;
+ goto error;
+ }
+
if (!notrigger) {
printf("%s %s\n", dev_dir_name, trigger_name);
/*
@@ -607,7 +639,8 @@ int main(int argc, char **argv)
ret = write_sysfs_int("enable", buf_dir_name, 1);
if (ret < 0) {
fprintf(stderr,
- "Failed to enable buffer: %s\n", strerror(-ret));
+ "Failed to enable buffer '%s': %s\n",
+ buf_dir_name, strerror(-ret));
goto error;
}
@@ -625,17 +658,50 @@ int main(int argc, char **argv)
}
/* Attempt to open non blocking the access dev */
- fp = open(buffer_access, O_RDONLY | O_NONBLOCK);
- if (fp == -1) { /* TODO: If it isn't there make the node */
+ fd = open(buffer_access, O_RDONLY | O_NONBLOCK);
+ if (fd == -1) { /* TODO: If it isn't there make the node */
ret = -errno;
fprintf(stderr, "Failed to open %s\n", buffer_access);
goto error;
}
+ /* specify for which buffer index we want an FD */
+ buf_fd = buffer_idx;
+
+ ret = ioctl(fd, IIO_BUFFER_GET_FD_IOCTL, &buf_fd);
+ if (ret == -1 || buf_fd == -1) {
+ ret = -errno;
+ if (ret == -ENODEV || ret == -EINVAL)
+ fprintf(stderr,
+ "This device does not support buffers\n");
+ else
+ fprintf(stderr, "Failed to retrieve buffer fd\n");
+ if (close(fd) == -1)
+ perror("Failed to close character device file");
+
+ goto error;
+ }
+
+ /* if this is buffer0, check that we get EBUSY after this point */
+ if (buffer_idx == 0) {
+ errno = 0;
+ read_size = read(fd, data, 1);
+ if (read_size > -1 || errno != EBUSY) {
+ ret = -EFAULT;
+ perror("Reading from '%s' should not be possible after ioctl()");
+ goto error;
+ }
+ }
+
+ /* close now the main chardev FD and let the buffer FD work */
+ if (close(fd) == -1)
+ perror("Failed to close character device file");
+ fd = -1;
+
for (j = 0; j < num_loops || num_loops < 0; j++) {
if (!noevents) {
struct pollfd pfd = {
- .fd = fp,
+ .fd = buf_fd,
.events = POLLIN,
};
@@ -653,7 +719,7 @@ int main(int argc, char **argv)
toread = 64;
}
- read_size = read(fp, data, toread * scan_size);
+ read_size = read(buf_fd, data, toread * scan_size);
if (read_size < 0) {
if (errno == EAGAIN) {
fprintf(stderr, "nothing available\n");
@@ -670,7 +736,9 @@ int main(int argc, char **argv)
error:
cleanup();
- if (fp >= 0 && close(fp) == -1)
+ if (fd >= 0 && close(fd) == -1)
+ perror("Failed to close character device");
+ if (buf_fd >= 0 && close(buf_fd) == -1)
perror("Failed to close buffer");
free(buffer_access);
free(data);
diff --git a/tools/iio/iio_utils.c b/tools/iio/iio_utils.c
index a96002f2c2d5..aadee6d34c74 100644
--- a/tools/iio/iio_utils.c
+++ b/tools/iio/iio_utils.c
@@ -77,6 +77,7 @@ int iioutils_break_up_name(const char *full_name, char **generic_name)
* @mask: output a bit mask for the raw data
* @be: output if data in big endian
* @device_dir: the IIO device directory
+ * @buffer_idx: the IIO buffer index
* @name: the channel name
* @generic_name: the channel type name
*
@@ -85,8 +86,8 @@ int iioutils_break_up_name(const char *full_name, char **generic_name)
static int iioutils_get_type(unsigned int *is_signed, unsigned int *bytes,
unsigned int *bits_used, unsigned int *shift,
uint64_t *mask, unsigned int *be,
- const char *device_dir, const char *name,
- const char *generic_name)
+ const char *device_dir, int buffer_idx,
+ const char *name, const char *generic_name)
{
FILE *sysfsfp;
int ret;
@@ -96,7 +97,7 @@ static int iioutils_get_type(unsigned int *is_signed, unsigned int *bytes,
unsigned padint;
const struct dirent *ent;
- ret = asprintf(&scan_el_dir, FORMAT_SCAN_ELEMENTS_DIR, device_dir);
+ ret = asprintf(&scan_el_dir, FORMAT_SCAN_ELEMENTS_DIR, device_dir, buffer_idx);
if (ret < 0)
return -ENOMEM;
@@ -304,12 +305,13 @@ void bsort_channel_array_by_index(struct iio_channel_info *ci_array, int cnt)
/**
* build_channel_array() - function to figure out what channels are present
* @device_dir: the IIO device directory in sysfs
+ * @buffer_idx: the IIO buffer for this channel array
* @ci_array: output the resulting array of iio_channel_info
* @counter: output the amount of array elements
*
* Returns 0 on success, otherwise a negative error code.
**/
-int build_channel_array(const char *device_dir,
+int build_channel_array(const char *device_dir, int buffer_idx,
struct iio_channel_info **ci_array, int *counter)
{
DIR *dp;
@@ -322,7 +324,7 @@ int build_channel_array(const char *device_dir,
char *filename;
*counter = 0;
- ret = asprintf(&scan_el_dir, FORMAT_SCAN_ELEMENTS_DIR, device_dir);
+ ret = asprintf(&scan_el_dir, FORMAT_SCAN_ELEMENTS_DIR, device_dir, buffer_idx);
if (ret < 0)
return -ENOMEM;
@@ -503,6 +505,7 @@ int build_channel_array(const char *device_dir,
¤t->mask,
¤t->be,
device_dir,
+ buffer_idx,
current->name,
current->generic_name);
if (ret < 0)
diff --git a/tools/iio/iio_utils.h b/tools/iio/iio_utils.h
index a5d0aa8a57d3..336752cade4f 100644
--- a/tools/iio/iio_utils.h
+++ b/tools/iio/iio_utils.h
@@ -12,7 +12,7 @@
/* Made up value to limit allocation sizes */
#define IIO_MAX_NAME_LENGTH 64
-#define FORMAT_SCAN_ELEMENTS_DIR "%s/scan_elements"
+#define FORMAT_SCAN_ELEMENTS_DIR "%s/buffer%d"
#define FORMAT_TYPE_FILE "%s_type"
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))
@@ -61,7 +61,7 @@ int iioutils_get_param_float(float *output, const char *param_name,
const char *device_dir, const char *name,
const char *generic_name);
void bsort_channel_array_by_index(struct iio_channel_info *ci_array, int cnt);
-int build_channel_array(const char *device_dir,
+int build_channel_array(const char *device_dir, int buffer_idx,
struct iio_channel_info **ci_array, int *counter);
int find_type_by_name(const char *name, const char *type);
int write_sysfs_int(const char *filename, const char *basedir, int val);
--
2.17.1
This is a bit of a tidy-up, but also helps with extending the
iioutils_get_type() function a bit, as we don't need to use it outside of
the iio_utils.c file. So, we'll need to update it only in one place.
With this change, the 'unsigned' types are updated to 'unsigned int' in the
iioutils_get_type() function definition.
Signed-off-by: Alexandru Ardelean <[email protected]>
---
tools/iio/iio_utils.c | 9 +++++----
tools/iio/iio_utils.h | 4 ----
2 files changed, 5 insertions(+), 8 deletions(-)
diff --git a/tools/iio/iio_utils.c b/tools/iio/iio_utils.c
index 7399eb7f1378..a96002f2c2d5 100644
--- a/tools/iio/iio_utils.c
+++ b/tools/iio/iio_utils.c
@@ -82,10 +82,11 @@ int iioutils_break_up_name(const char *full_name, char **generic_name)
*
* Returns a value >= 0 on success, otherwise a negative error code.
**/
-int iioutils_get_type(unsigned *is_signed, unsigned *bytes, unsigned *bits_used,
- unsigned *shift, uint64_t *mask, unsigned *be,
- const char *device_dir, const char *name,
- const char *generic_name)
+static int iioutils_get_type(unsigned int *is_signed, unsigned int *bytes,
+ unsigned int *bits_used, unsigned int *shift,
+ uint64_t *mask, unsigned int *be,
+ const char *device_dir, const char *name,
+ const char *generic_name)
{
FILE *sysfsfp;
int ret;
diff --git a/tools/iio/iio_utils.h b/tools/iio/iio_utils.h
index 74bde4fde2c8..a5d0aa8a57d3 100644
--- a/tools/iio/iio_utils.h
+++ b/tools/iio/iio_utils.h
@@ -57,10 +57,6 @@ static inline int iioutils_check_suffix(const char *str, const char *suffix)
}
int iioutils_break_up_name(const char *full_name, char **generic_name);
-int iioutils_get_type(unsigned *is_signed, unsigned *bytes, unsigned *bits_used,
- unsigned *shift, uint64_t *mask, unsigned *be,
- const char *device_dir, const char *name,
- const char *generic_name);
int iioutils_get_param_float(float *output, const char *param_name,
const char *device_dir, const char *name,
const char *generic_name);
--
2.17.1
Mostly a tidy-up.
But also helps to understand the limits of scope of these functions and
globals.
Signed-off-by: Alexandru Ardelean <[email protected]>
---
tools/iio/iio_generic_buffer.c | 31 +++++++++++++++----------------
1 file changed, 15 insertions(+), 16 deletions(-)
diff --git a/tools/iio/iio_generic_buffer.c b/tools/iio/iio_generic_buffer.c
index 34d63bcebcd2..7c7240553777 100644
--- a/tools/iio/iio_generic_buffer.c
+++ b/tools/iio/iio_generic_buffer.c
@@ -49,7 +49,7 @@ enum autochan {
* Has the side effect of filling the channels[i].location values used
* in processing the buffer output.
**/
-int size_from_channelarray(struct iio_channel_info *channels, int num_channels)
+static int size_from_channelarray(struct iio_channel_info *channels, int num_channels)
{
int bytes = 0;
int i = 0;
@@ -68,7 +68,7 @@ int size_from_channelarray(struct iio_channel_info *channels, int num_channels)
return bytes;
}
-void print1byte(uint8_t input, struct iio_channel_info *info)
+static void print1byte(uint8_t input, struct iio_channel_info *info)
{
/*
* Shift before conversion to avoid sign extension
@@ -85,7 +85,7 @@ void print1byte(uint8_t input, struct iio_channel_info *info)
}
}
-void print2byte(uint16_t input, struct iio_channel_info *info)
+static void print2byte(uint16_t input, struct iio_channel_info *info)
{
/* First swap if incorrect endian */
if (info->be)
@@ -108,7 +108,7 @@ void print2byte(uint16_t input, struct iio_channel_info *info)
}
}
-void print4byte(uint32_t input, struct iio_channel_info *info)
+static void print4byte(uint32_t input, struct iio_channel_info *info)
{
/* First swap if incorrect endian */
if (info->be)
@@ -131,7 +131,7 @@ void print4byte(uint32_t input, struct iio_channel_info *info)
}
}
-void print8byte(uint64_t input, struct iio_channel_info *info)
+static void print8byte(uint64_t input, struct iio_channel_info *info)
{
/* First swap if incorrect endian */
if (info->be)
@@ -167,9 +167,8 @@ void print8byte(uint64_t input, struct iio_channel_info *info)
* to fill the location offsets.
* @num_channels: number of channels
**/
-void process_scan(char *data,
- struct iio_channel_info *channels,
- int num_channels)
+static void process_scan(char *data, struct iio_channel_info *channels,
+ int num_channels)
{
int k;
@@ -238,7 +237,7 @@ static int enable_disable_all_channels(char *dev_dir_name, int enable)
return 0;
}
-void print_usage(void)
+static void print_usage(void)
{
fprintf(stderr, "Usage: generic_buffer [options]...\n"
"Capture, convert and output data from IIO device buffer\n"
@@ -257,12 +256,12 @@ void print_usage(void)
" -w <n> Set delay between reads in us (event-less mode)\n");
}
-enum autochan autochannels = AUTOCHANNELS_DISABLED;
-char *dev_dir_name = NULL;
-char *buf_dir_name = NULL;
-bool current_trigger_set = false;
+static enum autochan autochannels = AUTOCHANNELS_DISABLED;
+static char *dev_dir_name = NULL;
+static char *buf_dir_name = NULL;
+static bool current_trigger_set = false;
-void cleanup(void)
+static void cleanup(void)
{
int ret;
@@ -294,14 +293,14 @@ void cleanup(void)
}
}
-void sig_handler(int signum)
+static void sig_handler(int signum)
{
fprintf(stderr, "Caught signal %d\n", signum);
cleanup();
exit(-signum);
}
-void register_cleanup(void)
+static void register_cleanup(void)
{
struct sigaction sa = { .sa_handler = sig_handler };
const int signums[] = { SIGINT, SIGTERM, SIGABRT };
--
2.17.1
With this change, an ioctl() call is added to open a character device for a
buffer. The ioctl() number is 'i' 0x91, which follows the
IIO_GET_EVENT_FD_IOCTL ioctl.
The ioctl() will return an FD for the requested buffer index. The indexes
are the same from the /sys/iio/devices/iio:deviceX/bufferY (i.e. the Y
variable).
Since there doesn't seem to be a sane way to return the FD for buffer0 to
be the same FD for the /dev/iio:deviceX, this ioctl() will return another
FD for buffer0 (or the first buffer). This duplicate FD will be able to
access the same buffer object (for buffer0) as accessing directly the
/dev/iio:deviceX chardev.
Also, there is no IIO_BUFFER_GET_BUFFER_COUNT ioctl() implemented, as the
index for each buffer (and the count) can be deduced from the
'/sys/bus/iio/devices/iio:deviceX/bufferY' folders (i.e the number of
bufferY folders).
Used following C code to test this:
-------------------------------------------------------------------
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <fcntl.h"
#include <errno.h>
#define IIO_BUFFER_GET_FD_IOCTL _IOWR('i', 0x91, int)
int main(int argc, char *argv[])
{
int fd;
int fd1;
int ret;
if ((fd = open("/dev/iio:device0", O_RDWR))<0) {
fprintf(stderr, "Error open() %d errno %d\n",fd, errno);
return -1;
}
fprintf(stderr, "Using FD %d\n", fd);
fd1 = atoi(argv[1]);
ret = ioctl(fd, IIO_BUFFER_GET_FD_IOCTL, &fd1);
if (ret < 0) {
fprintf(stderr, "Error for buffer %d ioctl() %d errno %d\n", fd1, ret, errno);
close(fd);
return -1;
}
fprintf(stderr, "Got FD %d\n", fd1);
close(fd1);
close(fd);
return 0;
}
-------------------------------------------------------------------
Results are:
-------------------------------------------------------------------
# ./test 0
Using FD 3
Got FD 4
# ./test 1
Using FD 3
Got FD 4
# ./test 2
Using FD 3
Got FD 4
# ./test 3
Using FD 3
Got FD 4
# ls /sys/bus/iio/devices/iio\:device0
buffer buffer0 buffer1 buffer2 buffer3 dev
in_voltage_sampling_frequency in_voltage_scale
in_voltage_scale_available
name of_node power scan_elements subsystem uevent
-------------------------------------------------------------------
iio:device0 has some fake kfifo buffers attached to an IIO device.
Signed-off-by: Alexandru Ardelean <[email protected]>
---
drivers/iio/iio_core.h | 12 +--
drivers/iio/industrialio-buffer.c | 137 ++++++++++++++++++++++++++++--
drivers/iio/industrialio-core.c | 1 +
include/linux/iio/buffer_impl.h | 5 ++
include/linux/iio/iio-opaque.h | 2 +
include/uapi/linux/iio/buffer.h | 10 +++
6 files changed, 156 insertions(+), 11 deletions(-)
create mode 100644 include/uapi/linux/iio/buffer.h
diff --git a/drivers/iio/iio_core.h b/drivers/iio/iio_core.h
index 4690c3240a5d..88db1feb5857 100644
--- a/drivers/iio/iio_core.h
+++ b/drivers/iio/iio_core.h
@@ -64,16 +64,16 @@ ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals);
#ifdef CONFIG_IIO_BUFFER
struct poll_table_struct;
-__poll_t iio_buffer_poll(struct file *filp,
- struct poll_table_struct *wait);
-ssize_t iio_buffer_read_outer(struct file *filp, char __user *buf,
- size_t n, loff_t *f_ps);
+__poll_t iio_buffer_poll_wrapper(struct file *filp,
+ struct poll_table_struct *wait);
+ssize_t iio_buffer_read_wrapper(struct file *filp, char __user *buf,
+ size_t n, loff_t *f_ps);
int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev);
void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev);
-#define iio_buffer_poll_addr (&iio_buffer_poll)
-#define iio_buffer_read_outer_addr (&iio_buffer_read_outer)
+#define iio_buffer_poll_addr (&iio_buffer_poll_wrapper)
+#define iio_buffer_read_outer_addr (&iio_buffer_read_wrapper)
void iio_disable_all_buffers(struct iio_dev *indio_dev);
void iio_buffer_wakeup_poll(struct iio_dev *indio_dev);
diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index 1e8e4c2ff00e..dea37dbf5d28 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -9,6 +9,7 @@
* - Better memory allocation techniques?
* - Alternative access techniques?
*/
+#include <linux/anon_inodes.h>
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/device.h>
@@ -89,7 +90,7 @@ static bool iio_buffer_ready(struct iio_dev *indio_dev, struct iio_buffer *buf,
}
/**
- * iio_buffer_read_outer() - chrdev read for buffer access
+ * iio_buffer_read() - chrdev read for buffer access
* @filp: File structure pointer for the char device
* @buf: Destination buffer for iio buffer read
* @n: First n bytes to read
@@ -101,8 +102,8 @@ static bool iio_buffer_ready(struct iio_dev *indio_dev, struct iio_buffer *buf,
* Return: negative values corresponding to error codes or ret != 0
* for ending the reading activity
**/
-ssize_t iio_buffer_read_outer(struct file *filp, char __user *buf,
- size_t n, loff_t *f_ps)
+static ssize_t iio_buffer_read(struct file *filp, char __user *buf,
+ size_t n, loff_t *f_ps)
{
struct iio_dev_buffer_pair *ib = filp->private_data;
struct iio_buffer *rb = ib->buffer;
@@ -168,8 +169,8 @@ ssize_t iio_buffer_read_outer(struct file *filp, char __user *buf,
* Return: (EPOLLIN | EPOLLRDNORM) if data is available for reading
* or 0 for other cases
*/
-__poll_t iio_buffer_poll(struct file *filp,
- struct poll_table_struct *wait)
+static __poll_t iio_buffer_poll(struct file *filp,
+ struct poll_table_struct *wait)
{
struct iio_dev_buffer_pair *ib = filp->private_data;
struct iio_buffer *rb = ib->buffer;
@@ -184,6 +185,32 @@ __poll_t iio_buffer_poll(struct file *filp,
return 0;
}
+ssize_t iio_buffer_read_wrapper(struct file *filp, char __user *buf,
+ size_t n, loff_t *f_ps)
+{
+ struct iio_dev_buffer_pair *ib = filp->private_data;
+ struct iio_buffer *rb = ib->buffer;
+
+ /* check if buffer was opened through new API */
+ if (test_bit(IIO_BUSY_BIT_POS, &rb->flags))
+ return -EBUSY;
+
+ return iio_buffer_read(filp, buf, n, f_ps);
+}
+
+__poll_t iio_buffer_poll_wrapper(struct file *filp,
+ struct poll_table_struct *wait)
+{
+ struct iio_dev_buffer_pair *ib = filp->private_data;
+ struct iio_buffer *rb = ib->buffer;
+
+ /* check if buffer was opened through new API */
+ if (test_bit(IIO_BUSY_BIT_POS, &rb->flags))
+ return -EBUSY;
+
+ return iio_buffer_poll(filp, wait);
+}
+
/**
* iio_buffer_wakeup_poll - Wakes up the buffer waitqueue
* @indio_dev: The IIO device
@@ -1343,6 +1370,90 @@ static void iio_buffer_unregister_legacy_sysfs_groups(struct iio_dev *indio_dev)
kfree(iio_dev_opaque->legacy_scan_el_group.attrs);
}
+static int iio_buffer_chrdev_release(struct inode *inode, struct file *filep)
+{
+ struct iio_dev_buffer_pair *ib = filep->private_data;
+ struct iio_dev *indio_dev = ib->indio_dev;
+ struct iio_buffer *buffer = ib->buffer;
+
+ clear_bit(IIO_BUSY_BIT_POS, &buffer->flags);
+ iio_device_put(indio_dev);
+ kfree(ib);
+
+ return 0;
+}
+
+static const struct file_operations iio_buffer_chrdev_fileops = {
+ .owner = THIS_MODULE,
+ .llseek = noop_llseek,
+ .read = iio_buffer_read,
+ .poll = iio_buffer_poll,
+ .compat_ioctl = compat_ptr_ioctl,
+ .release = iio_buffer_chrdev_release,
+};
+
+static long iio_device_buffer_getfd(struct iio_dev *indio_dev, unsigned long arg)
+{
+ struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
+ int __user *ival = (int __user *)arg;
+ char buf_name[sizeof("iio:buffer:xxx")];
+ struct iio_dev_buffer_pair *ib;
+ struct iio_buffer *buffer;
+ int fd, idx;
+
+ if (copy_from_user(&idx, ival, sizeof(idx)))
+ return -EFAULT;
+
+ if (idx >= iio_dev_opaque->attached_buffers_cnt)
+ return -ENODEV;
+
+ buffer = iio_dev_opaque->attached_buffers[idx];
+
+ if (test_and_set_bit(IIO_BUSY_BIT_POS, &buffer->flags))
+ return -EBUSY;
+
+ iio_device_get(indio_dev);
+
+ ib = kzalloc(sizeof(*ib), GFP_KERNEL);
+ if (!ib) {
+ fd = -ENOMEM;
+ goto error_iio_dev_put;
+ }
+
+ ib->indio_dev = indio_dev;
+ ib->buffer = buffer;
+
+ fd = anon_inode_getfd(buf_name, &iio_buffer_chrdev_fileops,
+ ib, O_RDWR | O_CLOEXEC);
+ if (fd < 0)
+ goto error_free_ib;
+
+ if (copy_to_user(ival, &fd, sizeof(fd))) {
+ fd = -EFAULT;
+ goto error_free_ib;
+ }
+
+ return fd;
+
+error_free_ib:
+ kfree(ib);
+error_iio_dev_put:
+ iio_device_put(indio_dev);
+ clear_bit(IIO_BUSY_BIT_POS, &buffer->flags);
+ return fd;
+}
+
+static long iio_device_buffer_ioctl(struct iio_dev *indio_dev, struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ switch (cmd) {
+ case IIO_BUFFER_GET_FD_IOCTL:
+ return iio_device_buffer_getfd(indio_dev, arg);
+ default:
+ return IIO_IOCTL_UNHANDLED;
+ }
+}
+
static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer,
struct iio_dev *indio_dev,
int index)
@@ -1472,6 +1583,7 @@ int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
struct iio_buffer *buffer;
int unwind_idx;
int ret, i;
+ size_t sz;
channels = indio_dev->channels;
if (channels) {
@@ -1493,6 +1605,18 @@ int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
goto error_unwind_sysfs_and_mask;
}
}
+ unwind_idx = iio_dev_opaque->attached_buffers_cnt - 1;
+
+ sz = sizeof(*(iio_dev_opaque->buffer_ioctl_handler));
+ iio_dev_opaque->buffer_ioctl_handler = kzalloc(sz, GFP_KERNEL);
+ if (!iio_dev_opaque->buffer_ioctl_handler) {
+ ret = -ENOMEM;
+ goto error_unwind_sysfs_and_mask;
+ }
+
+ iio_dev_opaque->buffer_ioctl_handler->ioctl = iio_device_buffer_ioctl;
+ iio_device_ioctl_handler_register(indio_dev,
+ iio_dev_opaque->buffer_ioctl_handler);
return 0;
@@ -1514,6 +1638,9 @@ void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev)
if (!iio_dev_opaque->attached_buffers_cnt)
return;
+ iio_device_ioctl_handler_unregister(iio_dev_opaque->buffer_ioctl_handler);
+ kfree(iio_dev_opaque->buffer_ioctl_handler);
+
iio_buffer_unregister_legacy_sysfs_groups(indio_dev);
for (i = iio_dev_opaque->attached_buffers_cnt - 1; i >= 0; i--) {
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 26b05dddfa71..febb3a0d91f3 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -1737,6 +1737,7 @@ static int iio_chrdev_release(struct inode *inode, struct file *filp)
struct iio_dev_buffer_pair *ib = filp->private_data;
struct iio_dev *indio_dev = container_of(inode->i_cdev,
struct iio_dev, chrdev);
+
clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
iio_device_put(indio_dev);
kfree(ib);
diff --git a/include/linux/iio/buffer_impl.h b/include/linux/iio/buffer_impl.h
index 768b90c64412..245b32918ae1 100644
--- a/include/linux/iio/buffer_impl.h
+++ b/include/linux/iio/buffer_impl.h
@@ -6,6 +6,8 @@
#ifdef CONFIG_IIO_BUFFER
+#include <uapi/linux/iio/buffer.h>
+
struct iio_dev;
struct iio_buffer;
@@ -72,6 +74,9 @@ struct iio_buffer {
/** @length: Number of datums in buffer. */
unsigned int length;
+ /** @flags: File ops flags including busy flag. */
+ unsigned long flags;
+
/** @bytes_per_datum: Size of individual datum including timestamp. */
size_t bytes_per_datum;
diff --git a/include/linux/iio/iio-opaque.h b/include/linux/iio/iio-opaque.h
index c909835b6247..2c3374d465da 100644
--- a/include/linux/iio/iio-opaque.h
+++ b/include/linux/iio/iio-opaque.h
@@ -9,6 +9,7 @@
* @event_interface: event chrdevs associated with interrupt lines
* @attached_buffers: array of buffers statically attached by the driver
* @attached_buffers_cnt: number of buffers in the array of statically attached buffers
+ * @buffer_ioctl_handler: ioctl() handler for this IIO device's buffer interface
* @buffer_list: list of all buffers currently attached
* @channel_attr_list: keep track of automatically created channel
* attributes
@@ -28,6 +29,7 @@ struct iio_dev_opaque {
struct iio_event_interface *event_interface;
struct iio_buffer **attached_buffers;
unsigned int attached_buffers_cnt;
+ struct iio_ioctl_handler *buffer_ioctl_handler;
struct list_head buffer_list;
struct list_head channel_attr_list;
struct attribute_group chan_attr_group;
diff --git a/include/uapi/linux/iio/buffer.h b/include/uapi/linux/iio/buffer.h
new file mode 100644
index 000000000000..de571c83c9f2
--- /dev/null
+++ b/include/uapi/linux/iio/buffer.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/* industrial I/O buffer definitions needed both in and out of kernel
+ */
+
+#ifndef _UAPI_IIO_BUFFER_H_
+#define _UAPI_IIO_BUFFER_H_
+
+#define IIO_BUFFER_GET_FD_IOCTL _IOWR('i', 0x91, int)
+
+#endif /* _UAPI_IIO_BUFFER_H_ */
--
2.17.1
In order to keep backwards compatibility with the current chardev
mechanism, and in order to add support for multiple buffers per IIO device,
we need to pass both the IIO device & IIO buffer to the chardev.
This is particularly needed for the iio_buffer_read_outer() function, where
we need to pass another buffer object than 'indio_dev->buffer'.
Since we'll also open some chardevs via anon inodes, we can pass extra
buffers in that function by assigning another object to the
iio_dev_buffer_pair object.
Signed-off-by: Alexandru Ardelean <[email protected]>
---
drivers/iio/iio_core.h | 5 +++++
drivers/iio/industrialio-buffer.c | 10 ++++++----
drivers/iio/industrialio-core.c | 18 ++++++++++++++++--
3 files changed, 27 insertions(+), 6 deletions(-)
diff --git a/drivers/iio/iio_core.h b/drivers/iio/iio_core.h
index 731f5170d5b9..87868fff7d37 100644
--- a/drivers/iio/iio_core.h
+++ b/drivers/iio/iio_core.h
@@ -18,6 +18,11 @@ struct iio_dev;
extern struct device_type iio_device_type;
+struct iio_dev_buffer_pair {
+ struct iio_dev *indio_dev;
+ struct iio_buffer *buffer;
+};
+
#define IIO_IOCTL_UNHANDLED 1
struct iio_ioctl_handler {
struct list_head entry;
diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index d79d81485a3f..a6148ed24e41 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -104,8 +104,9 @@ static bool iio_buffer_ready(struct iio_dev *indio_dev, struct iio_buffer *buf,
ssize_t iio_buffer_read_outer(struct file *filp, char __user *buf,
size_t n, loff_t *f_ps)
{
- struct iio_dev *indio_dev = filp->private_data;
- struct iio_buffer *rb = indio_dev->buffer;
+ struct iio_dev_buffer_pair *ib = filp->private_data;
+ struct iio_buffer *rb = ib->buffer;
+ struct iio_dev *indio_dev = ib->indio_dev;
DEFINE_WAIT_FUNC(wait, woken_wake_function);
size_t datum_size;
size_t to_wait;
@@ -170,8 +171,9 @@ ssize_t iio_buffer_read_outer(struct file *filp, char __user *buf,
__poll_t iio_buffer_poll(struct file *filp,
struct poll_table_struct *wait)
{
- struct iio_dev *indio_dev = filp->private_data;
- struct iio_buffer *rb = indio_dev->buffer;
+ struct iio_dev_buffer_pair *ib = filp->private_data;
+ struct iio_buffer *rb = ib->buffer;
+ struct iio_dev *indio_dev = ib->indio_dev;
if (!indio_dev->info || rb == NULL)
return 0;
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 2e8e656e41dd..1be94df3e591 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -1703,13 +1703,24 @@ static int iio_chrdev_open(struct inode *inode, struct file *filp)
{
struct iio_dev *indio_dev = container_of(inode->i_cdev,
struct iio_dev, chrdev);
+ struct iio_dev_buffer_pair *ib;
if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
return -EBUSY;
iio_device_get(indio_dev);
- filp->private_data = indio_dev;
+ ib = kmalloc(sizeof(*ib), GFP_KERNEL);
+ if (!ib) {
+ iio_device_put(indio_dev);
+ clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
+ return -ENOMEM;
+ }
+
+ ib->indio_dev = indio_dev;
+ ib->buffer = indio_dev->buffer;
+
+ filp->private_data = ib;
return 0;
}
@@ -1723,10 +1734,12 @@ static int iio_chrdev_open(struct inode *inode, struct file *filp)
*/
static int iio_chrdev_release(struct inode *inode, struct file *filp)
{
+ struct iio_dev_buffer_pair *ib = filp->private_data;
struct iio_dev *indio_dev = container_of(inode->i_cdev,
struct iio_dev, chrdev);
clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
iio_device_put(indio_dev);
+ kfree(ib);
return 0;
}
@@ -1746,7 +1759,8 @@ void iio_device_ioctl_handler_unregister(struct iio_ioctl_handler *h)
static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
- struct iio_dev *indio_dev = filp->private_data;
+ struct iio_dev_buffer_pair *ib = filp->private_data;
+ struct iio_dev *indio_dev = ib->indio_dev;
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
struct iio_ioctl_handler *h;
int ret = -ENODEV;
--
2.17.1
The reference to the IIO buffer object is stored on the attribute object.
So we need to unwind it to obtain it.
Signed-off-by: Alexandru Ardelean <[email protected]>
---
drivers/iio/buffer/industrialio-buffer-dmaengine.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/buffer/industrialio-buffer-dmaengine.c b/drivers/iio/buffer/industrialio-buffer-dmaengine.c
index b0cb9a35f5cd..1e9e8fdd0719 100644
--- a/drivers/iio/buffer/industrialio-buffer-dmaengine.c
+++ b/drivers/iio/buffer/industrialio-buffer-dmaengine.c
@@ -133,8 +133,9 @@ static ssize_t iio_dmaengine_buffer_get_length_align(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer;
struct dmaengine_buffer *dmaengine_buffer =
- iio_buffer_to_dmaengine_buffer(indio_dev->buffer);
+ iio_buffer_to_dmaengine_buffer(buffer);
return sprintf(buf, "%zu\n", dmaengine_buffer->align);
}
--
2.17.1
If we want to merge the attributes of the buffer/ and scan_elements/
directories, we'll need to count all attributes first, then (depending on
the attribute group) either allocate 2 attribute groups, or a single one.
Historically an IIO buffer was described by 2 subdirectories under
/sys/bus/iio/iio:devicesX (i.e. buffer/ and scan_elements/); these subdirs
were actually 2 separate attribute groups on the iio_buffer object.
Moving forward, if we want to allow more than one buffer per IIO device,
keeping 2 subdirectories for each IIO buffer is a bit cumbersome
(especially for userpace ABI). So, we will merge the attributes of these 2
subdirs under a /sys/bus/iio/iio:devicesX/bufferY subdirectory. To do this,
we need to count all attributes first, and then distribute them based on
which buffer this is. For the first buffer, we'll need to also allocate the
legacy 2 attribute groups (for buffer/ and scan_elements/), and also a
/sys/bus/iio/iio:devicesX/buffer0 attribute group.
For buffer1 and above, just a single attribute group will be allocated (the
merged one).
Signed-off-by: Alexandru Ardelean <[email protected]>
---
drivers/iio/industrialio-buffer.c | 71 ++++++++++++++++---------------
1 file changed, 37 insertions(+), 34 deletions(-)
diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index cc846988fdb9..23f22be62cc7 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -1257,41 +1257,16 @@ static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer,
{
struct iio_dev_attr *p;
struct attribute **attr;
- int ret, i, attrn, attrcount;
+ int ret, i, attrn, scan_el_attrcount, buffer_attrcount;
const struct iio_chan_spec *channels;
- attrcount = 0;
+ buffer_attrcount = 0;
if (buffer->attrs) {
- while (buffer->attrs[attrcount] != NULL)
- attrcount++;
+ while (buffer->attrs[buffer_attrcount] != NULL)
+ buffer_attrcount++;
}
- attr = kcalloc(attrcount + ARRAY_SIZE(iio_buffer_attrs) + 1,
- sizeof(struct attribute *), GFP_KERNEL);
- if (!attr)
- return -ENOMEM;
-
- memcpy(attr, iio_buffer_attrs, sizeof(iio_buffer_attrs));
- if (!buffer->access->set_length)
- attr[0] = &dev_attr_length_ro.attr;
-
- if (buffer->access->flags & INDIO_BUFFER_FLAG_FIXED_WATERMARK)
- attr[2] = &dev_attr_watermark_ro.attr;
-
- if (buffer->attrs)
- memcpy(&attr[ARRAY_SIZE(iio_buffer_attrs)], buffer->attrs,
- sizeof(struct attribute *) * attrcount);
-
- attr[attrcount + ARRAY_SIZE(iio_buffer_attrs)] = NULL;
-
- buffer->buffer_group.name = "buffer";
- buffer->buffer_group.attrs = attr;
-
- ret = iio_device_register_sysfs_group(indio_dev, &buffer->buffer_group);
- if (ret)
- goto error_free_buffer_attrs;
-
- attrcount = 0;
+ scan_el_attrcount = 0;
INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list);
channels = indio_dev->channels;
if (channels) {
@@ -1304,7 +1279,7 @@ static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer,
&channels[i]);
if (ret < 0)
goto error_cleanup_dynamic;
- attrcount += ret;
+ scan_el_attrcount += ret;
if (channels[i].type == IIO_TIMESTAMP)
indio_dev->scan_index_timestamp =
channels[i].scan_index;
@@ -1319,9 +1294,37 @@ static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer,
}
}
+ attr = kcalloc(buffer_attrcount + ARRAY_SIZE(iio_buffer_attrs) + 1,
+ sizeof(struct attribute *), GFP_KERNEL);
+ if (!attr) {
+ ret = -ENOMEM;
+ goto error_free_scan_mask;
+ }
+
+ memcpy(attr, iio_buffer_attrs, sizeof(iio_buffer_attrs));
+ if (!buffer->access->set_length)
+ attr[0] = &dev_attr_length_ro.attr;
+
+ if (buffer->access->flags & INDIO_BUFFER_FLAG_FIXED_WATERMARK)
+ attr[2] = &dev_attr_watermark_ro.attr;
+
+ if (buffer->attrs)
+ memcpy(&attr[ARRAY_SIZE(iio_buffer_attrs)], buffer->attrs,
+ sizeof(struct attribute *) * buffer_attrcount);
+
+ buffer_attrcount += ARRAY_SIZE(iio_buffer_attrs);
+ attr[buffer_attrcount] = NULL;
+
+ buffer->buffer_group.name = "buffer";
+ buffer->buffer_group.attrs = attr;
+
+ ret = iio_device_register_sysfs_group(indio_dev, &buffer->buffer_group);
+ if (ret)
+ goto error_free_buffer_attrs;
+
buffer->scan_el_group.name = iio_scan_elements_group_name;
- buffer->scan_el_group.attrs = kcalloc(attrcount + 1,
+ buffer->scan_el_group.attrs = kcalloc(scan_el_attrcount + 1,
sizeof(buffer->scan_el_group.attrs[0]),
GFP_KERNEL);
if (buffer->scan_el_group.attrs == NULL) {
@@ -1341,12 +1344,12 @@ static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer,
error_free_scan_el_attrs:
kfree(buffer->scan_el_group.attrs);
+error_free_buffer_attrs:
+ kfree(buffer->buffer_group.attrs);
error_free_scan_mask:
bitmap_free(buffer->scan_mask);
error_cleanup_dynamic:
iio_free_chan_devattr_list(&buffer->scan_el_dev_attr_list);
-error_free_buffer_attrs:
- kfree(buffer->buffer_group.attrs);
return ret;
}
--
2.17.1
With this change, calling iio_device_attach_buffer() will actually attach
more buffers.
Right now this doesn't do any validation of whether a buffer is attached
twice; maybe that can be added later (if needed). Attaching a buffer more
than once should yield noticeably bad results.
The first buffer is the legacy buffer, so a reference is kept to it.
At this point, accessing the data for the extra buffers (that are added
after the first one) isn't possible yet.
The iio_device_attach_buffer() is also changed to return an error code,
which for now is -ENOMEM if the array could not be realloc-ed for more
buffers.
Signed-off-by: Alexandru Ardelean <[email protected]>
---
drivers/iio/iio_core.h | 2 +
drivers/iio/industrialio-buffer.c | 96 +++++++++++++++++++++++++------
drivers/iio/industrialio-core.c | 6 +-
include/linux/iio/buffer.h | 4 +-
include/linux/iio/buffer_impl.h | 3 +
include/linux/iio/iio-opaque.h | 4 ++
6 files changed, 93 insertions(+), 22 deletions(-)
diff --git a/drivers/iio/iio_core.h b/drivers/iio/iio_core.h
index 87868fff7d37..4690c3240a5d 100644
--- a/drivers/iio/iio_core.h
+++ b/drivers/iio/iio_core.h
@@ -77,6 +77,7 @@ void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev);
void iio_disable_all_buffers(struct iio_dev *indio_dev);
void iio_buffer_wakeup_poll(struct iio_dev *indio_dev);
+void iio_buffers_put(struct iio_dev *indio_dev);
#else
@@ -92,6 +93,7 @@ static inline void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev) {}
static inline void iio_disable_all_buffers(struct iio_dev *indio_dev) {}
static inline void iio_buffer_wakeup_poll(struct iio_dev *indio_dev) {}
+static inline void iio_buffers_put(struct iio_dev *indio_dev) {}
#endif
diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index 209b3a32bdbb..1e8e4c2ff00e 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -193,12 +193,14 @@ __poll_t iio_buffer_poll(struct file *filp,
*/
void iio_buffer_wakeup_poll(struct iio_dev *indio_dev)
{
- struct iio_buffer *buffer = indio_dev->buffer;
-
- if (!buffer)
- return;
+ struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
+ struct iio_buffer *buffer;
+ unsigned int i;
- wake_up(&buffer->pollq);
+ for (i = 0; i < iio_dev_opaque->attached_buffers_cnt; i++) {
+ buffer = iio_dev_opaque->attached_buffers[i];
+ wake_up(&buffer->pollq);
+ }
}
void iio_buffer_init(struct iio_buffer *buffer)
@@ -212,6 +214,18 @@ void iio_buffer_init(struct iio_buffer *buffer)
}
EXPORT_SYMBOL(iio_buffer_init);
+void iio_buffers_put(struct iio_dev *indio_dev)
+{
+ struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
+ struct iio_buffer *buffer;
+ unsigned int i;
+
+ for (i = 0; i < iio_dev_opaque->attached_buffers_cnt; i++) {
+ buffer = iio_dev_opaque->attached_buffers[i];
+ iio_buffer_put(buffer);
+ }
+}
+
static ssize_t iio_show_scan_index(struct device *dev,
struct device_attribute *attr,
char *buf)
@@ -1453,9 +1467,11 @@ static void __iio_buffer_free_sysfs_and_mask(struct iio_buffer *buffer)
int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
{
- struct iio_buffer *buffer = indio_dev->buffer;
+ struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
const struct iio_chan_spec *channels;
- int i;
+ struct iio_buffer *buffer;
+ int unwind_idx;
+ int ret, i;
channels = indio_dev->channels;
if (channels) {
@@ -1466,22 +1482,46 @@ int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
indio_dev->masklength = ml;
}
- if (!buffer)
+ if (!iio_dev_opaque->attached_buffers_cnt)
return 0;
- return __iio_buffer_alloc_sysfs_and_mask(buffer, indio_dev, 0);
+ for (i = 0; i < iio_dev_opaque->attached_buffers_cnt; i++) {
+ buffer = iio_dev_opaque->attached_buffers[i];
+ ret = __iio_buffer_alloc_sysfs_and_mask(buffer, indio_dev, i);
+ if (ret) {
+ unwind_idx = i;
+ goto error_unwind_sysfs_and_mask;
+ }
+ }
+
+ return 0;
+
+error_unwind_sysfs_and_mask:
+ for (; unwind_idx >= 0; unwind_idx--) {
+ buffer = iio_dev_opaque->attached_buffers[unwind_idx];
+ __iio_buffer_free_sysfs_and_mask(buffer);
+ }
+ kfree(iio_dev_opaque->attached_buffers);
+ return ret;
}
void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev)
{
- struct iio_buffer *buffer = indio_dev->buffer;
+ struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
+ struct iio_buffer *buffer;
+ int i;
- if (!buffer)
+ if (!iio_dev_opaque->attached_buffers_cnt)
return;
iio_buffer_unregister_legacy_sysfs_groups(indio_dev);
- __iio_buffer_free_sysfs_and_mask(buffer);
+ for (i = iio_dev_opaque->attached_buffers_cnt - 1; i >= 0; i--) {
+ buffer = iio_dev_opaque->attached_buffers[i];
+ __iio_buffer_free_sysfs_and_mask(buffer);
+ }
+
+ kfree(iio_dev_opaque->attached_buffers);
}
/**
@@ -1599,13 +1639,35 @@ EXPORT_SYMBOL_GPL(iio_buffer_put);
* @indio_dev: The device the buffer should be attached to
* @buffer: The buffer to attach to the device
*
+ * Return 0 if successful, negative if error.
+ *
* This function attaches a buffer to a IIO device. The buffer stays attached to
- * the device until the device is freed. The function should only be called at
- * most once per device.
+ * the device until the device is freed. For legacy reasons, the first attached
+ * buffer will also be assigned to 'indio_dev->buffer'.
*/
-void iio_device_attach_buffer(struct iio_dev *indio_dev,
- struct iio_buffer *buffer)
+int iio_device_attach_buffer(struct iio_dev *indio_dev,
+ struct iio_buffer *buffer)
{
- indio_dev->buffer = iio_buffer_get(buffer);
+ struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
+ struct iio_buffer **new, **old = iio_dev_opaque->attached_buffers;
+ unsigned int cnt = iio_dev_opaque->attached_buffers_cnt;
+
+ cnt++;
+
+ new = krealloc(old, sizeof(*new) * cnt, GFP_KERNEL);
+ if (!new)
+ return -ENOMEM;
+ iio_dev_opaque->attached_buffers = new;
+
+ buffer = iio_buffer_get(buffer);
+
+ /* first buffer is legacy; attach it to the IIO device directly */
+ if (!indio_dev->buffer)
+ indio_dev->buffer = buffer;
+
+ iio_dev_opaque->attached_buffers[cnt - 1] = buffer;
+ iio_dev_opaque->attached_buffers_cnt = cnt;
+
+ return 0;
}
EXPORT_SYMBOL_GPL(iio_device_attach_buffer);
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 1be94df3e591..26b05dddfa71 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -1583,7 +1583,7 @@ static void iio_dev_release(struct device *device)
iio_device_unregister_eventset(indio_dev);
iio_device_unregister_sysfs(indio_dev);
- iio_buffer_put(indio_dev->buffer);
+ iio_buffers_put(indio_dev);
ida_simple_remove(&iio_ida, indio_dev->id);
kfree(iio_dev_opaque);
@@ -1884,12 +1884,12 @@ int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
indio_dev->setup_ops == NULL)
indio_dev->setup_ops = &noop_ring_setup_ops;
- if (indio_dev->buffer)
+ if (iio_dev_opaque->attached_buffers_cnt)
cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
else if (iio_dev_opaque->event_interface)
cdev_init(&indio_dev->chrdev, &iio_event_fileops);
- if (indio_dev->buffer || iio_dev_opaque->event_interface) {
+ if (iio_dev_opaque->attached_buffers_cnt || iio_dev_opaque->event_interface) {
indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
indio_dev->chrdev.owner = this_mod;
}
diff --git a/include/linux/iio/buffer.h b/include/linux/iio/buffer.h
index 8febc23f5f26..b6928ac5c63d 100644
--- a/include/linux/iio/buffer.h
+++ b/include/linux/iio/buffer.h
@@ -41,7 +41,7 @@ static inline int iio_push_to_buffers_with_timestamp(struct iio_dev *indio_dev,
bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev,
const unsigned long *mask);
-void iio_device_attach_buffer(struct iio_dev *indio_dev,
- struct iio_buffer *buffer);
+int iio_device_attach_buffer(struct iio_dev *indio_dev,
+ struct iio_buffer *buffer);
#endif /* _IIO_BUFFER_GENERIC_H_ */
diff --git a/include/linux/iio/buffer_impl.h b/include/linux/iio/buffer_impl.h
index 41044320e581..768b90c64412 100644
--- a/include/linux/iio/buffer_impl.h
+++ b/include/linux/iio/buffer_impl.h
@@ -112,6 +112,9 @@ struct iio_buffer {
/* @demux_bounce: Buffer for doing gather from incoming scan. */
void *demux_bounce;
+ /* @attached_entry: Entry in the devices list of buffers attached by the driver. */
+ struct list_head attached_entry;
+
/* @buffer_list: Entry in the devices list of current buffers. */
struct list_head buffer_list;
diff --git a/include/linux/iio/iio-opaque.h b/include/linux/iio/iio-opaque.h
index 3e4c3cd248fd..c909835b6247 100644
--- a/include/linux/iio/iio-opaque.h
+++ b/include/linux/iio/iio-opaque.h
@@ -7,6 +7,8 @@
* struct iio_dev_opaque - industrial I/O device opaque information
* @indio_dev: public industrial I/O device information
* @event_interface: event chrdevs associated with interrupt lines
+ * @attached_buffers: array of buffers statically attached by the driver
+ * @attached_buffers_cnt: number of buffers in the array of statically attached buffers
* @buffer_list: list of all buffers currently attached
* @channel_attr_list: keep track of automatically created channel
* attributes
@@ -24,6 +26,8 @@
struct iio_dev_opaque {
struct iio_dev indio_dev;
struct iio_event_interface *event_interface;
+ struct iio_buffer **attached_buffers;
+ unsigned int attached_buffers_cnt;
struct list_head buffer_list;
struct list_head channel_attr_list;
struct attribute_group chan_attr_group;
--
2.17.1
With this change, we create a new directory for the IIO device called
buffer0, under which both the old buffer/ and scan_elements/ are stored.
This is done to simplify the addition of multiple IIO buffers per IIO
device. Otherwise we would need to add a bufferX/ and scan_elementsX/
directory for each IIO buffer.
With the current way of storing attribute groups, we can't have directories
stored under each other (i.e. scan_elements/ under buffer/), so the best
approach moving forward is to merge their attributes.
The old/legacy buffer/ & scan_elements/ groups are not stored on the opaque
IIO device object. This way the IIO buffer can have just a single
attribute_group object, saving a bit of memory when adding multiple IIO
buffers.
Signed-off-by: Alexandru Ardelean <[email protected]>
---
drivers/iio/industrialio-buffer.c | 115 +++++++++++++++++++++++-------
include/linux/iio/buffer_impl.h | 9 +--
include/linux/iio/iio-opaque.h | 4 ++
3 files changed, 95 insertions(+), 33 deletions(-)
diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index 23f22be62cc7..fcbbffb904bf 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -1175,8 +1175,6 @@ static ssize_t iio_buffer_store_enable(struct device *dev,
return (ret < 0) ? ret : len;
}
-static const char * const iio_scan_elements_group_name = "scan_elements";
-
static ssize_t iio_buffer_show_watermark(struct device *dev,
struct device_attribute *attr,
char *buf)
@@ -1252,8 +1250,68 @@ static struct attribute *iio_buffer_attrs[] = {
&dev_attr_data_available.attr,
};
+static int iio_buffer_register_legacy_sysfs_groups(struct iio_dev *indio_dev,
+ struct attribute **buffer_attrs,
+ int buffer_attrcount,
+ int scan_el_attrcount)
+{
+ struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
+ struct attribute_group *group;
+ int ret;
+
+ group = &iio_dev_opaque->legacy_buffer_group;
+
+ group->attrs = kcalloc(buffer_attrcount + 1,
+ sizeof(struct attribute *), GFP_KERNEL);
+ if (!group->attrs)
+ return -ENOMEM;
+
+ memcpy(group->attrs, buffer_attrs,
+ buffer_attrcount * sizeof(struct attribute *));
+ group->name = "buffer";
+
+ ret = iio_device_register_sysfs_group(indio_dev, group);
+ if (ret)
+ goto error_free_buffer_attrs;
+
+ group = &iio_dev_opaque->legacy_scan_el_group;
+
+ group->attrs = kcalloc(scan_el_attrcount + 1,
+ sizeof(struct attribute *), GFP_KERNEL);
+ if (!group->attrs) {
+ ret = -ENOMEM;
+ goto error_free_buffer_attrs;
+ }
+
+ memcpy(group->attrs, &buffer_attrs[buffer_attrcount],
+ scan_el_attrcount * sizeof(struct attribute *));
+ group->name = "scan_elements";
+
+ ret = iio_device_register_sysfs_group(indio_dev, group);
+ if (ret)
+ goto error_free_scan_el_attrs;
+
+ return 0;
+
+error_free_buffer_attrs:
+ kfree(iio_dev_opaque->legacy_buffer_group.attrs);
+error_free_scan_el_attrs:
+ kfree(iio_dev_opaque->legacy_scan_el_group.attrs);
+
+ return ret;
+}
+
+static void iio_buffer_unregister_legacy_sysfs_groups(struct iio_dev *indio_dev)
+{
+ struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
+
+ kfree(iio_dev_opaque->legacy_buffer_group.attrs);
+ kfree(iio_dev_opaque->legacy_scan_el_group.attrs);
+}
+
static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer,
- struct iio_dev *indio_dev)
+ struct iio_dev *indio_dev,
+ int index)
{
struct iio_dev_attr *p;
struct attribute **attr;
@@ -1294,8 +1352,8 @@ static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer,
}
}
- attr = kcalloc(buffer_attrcount + ARRAY_SIZE(iio_buffer_attrs) + 1,
- sizeof(struct attribute *), GFP_KERNEL);
+ attrn = buffer_attrcount + scan_el_attrcount + ARRAY_SIZE(iio_buffer_attrs);
+ attr = kcalloc(attrn + 1, sizeof(struct attribute *), GFP_KERNEL);
if (!attr) {
ret = -ENOMEM;
goto error_free_scan_mask;
@@ -1313,37 +1371,38 @@ static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer,
sizeof(struct attribute *) * buffer_attrcount);
buffer_attrcount += ARRAY_SIZE(iio_buffer_attrs);
- attr[buffer_attrcount] = NULL;
-
- buffer->buffer_group.name = "buffer";
- buffer->buffer_group.attrs = attr;
- ret = iio_device_register_sysfs_group(indio_dev, &buffer->buffer_group);
- if (ret)
- goto error_free_buffer_attrs;
+ attrn = buffer_attrcount;
- buffer->scan_el_group.name = iio_scan_elements_group_name;
+ list_for_each_entry(p, &buffer->scan_el_dev_attr_list, l)
+ attr[attrn++] = &p->dev_attr.attr;
- buffer->scan_el_group.attrs = kcalloc(scan_el_attrcount + 1,
- sizeof(buffer->scan_el_group.attrs[0]),
- GFP_KERNEL);
- if (buffer->scan_el_group.attrs == NULL) {
+ buffer->buffer_group.name = kasprintf(GFP_KERNEL, "buffer%d", index);
+ if (!buffer->buffer_group.name) {
ret = -ENOMEM;
- goto error_free_scan_mask;
+ goto error_free_buffer_attrs;
}
- attrn = 0;
- list_for_each_entry(p, &buffer->scan_el_dev_attr_list, l)
- buffer->scan_el_group.attrs[attrn++] = &p->dev_attr.attr;
+ buffer->buffer_group.attrs = attr;
- ret = iio_device_register_sysfs_group(indio_dev, &buffer->scan_el_group);
+ ret = iio_device_register_sysfs_group(indio_dev, &buffer->buffer_group);
if (ret)
- goto error_free_scan_el_attrs;
+ goto error_free_buffer_attr_group_name;
+
+ /* we only need to link the legacy buffer groups for the first buffer */
+ if (index > 0)
+ return 0;
+
+ ret = iio_buffer_register_legacy_sysfs_groups(indio_dev, attr,
+ buffer_attrcount,
+ scan_el_attrcount);
+ if (ret)
+ goto error_free_buffer_attr_group_name;
return 0;
-error_free_scan_el_attrs:
- kfree(buffer->scan_el_group.attrs);
+error_free_buffer_attr_group_name:
+ kfree(buffer->buffer_group.name);
error_free_buffer_attrs:
kfree(buffer->buffer_group.attrs);
error_free_scan_mask:
@@ -1372,14 +1431,14 @@ int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
if (!buffer)
return 0;
- return __iio_buffer_alloc_sysfs_and_mask(buffer, indio_dev);
+ return __iio_buffer_alloc_sysfs_and_mask(buffer, indio_dev, 0);
}
static void __iio_buffer_free_sysfs_and_mask(struct iio_buffer *buffer)
{
bitmap_free(buffer->scan_mask);
+ kfree(buffer->buffer_group.name);
kfree(buffer->buffer_group.attrs);
- kfree(buffer->scan_el_group.attrs);
iio_free_chan_devattr_list(&buffer->scan_el_dev_attr_list);
}
@@ -1390,6 +1449,8 @@ void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev)
if (!buffer)
return;
+ iio_buffer_unregister_legacy_sysfs_groups(indio_dev);
+
__iio_buffer_free_sysfs_and_mask(buffer);
}
diff --git a/include/linux/iio/buffer_impl.h b/include/linux/iio/buffer_impl.h
index a63dc07b7350..3e555e58475b 100644
--- a/include/linux/iio/buffer_impl.h
+++ b/include/linux/iio/buffer_impl.h
@@ -100,14 +100,11 @@ struct iio_buffer {
/* @scan_el_dev_attr_list: List of scan element related attributes. */
struct list_head scan_el_dev_attr_list;
- /* @buffer_group: Attributes of the buffer group. */
- struct attribute_group buffer_group;
-
/*
- * @scan_el_group: Attribute group for those attributes not
- * created from the iio_chan_info array.
+ * @buffer_group: Attributes of the new buffer group.
+ * Includes scan elements attributes.
*/
- struct attribute_group scan_el_group;
+ struct attribute_group buffer_group;
/* @attrs: Standard attributes of the buffer. */
const struct attribute **attrs;
diff --git a/include/linux/iio/iio-opaque.h b/include/linux/iio/iio-opaque.h
index 8ba13a5c7af6..3e4c3cd248fd 100644
--- a/include/linux/iio/iio-opaque.h
+++ b/include/linux/iio/iio-opaque.h
@@ -14,6 +14,8 @@
* @ioctl_handlers: ioctl handlers registered with the core handler
* @groups: attribute groups
* @groupcounter: index of next attribute group
+ * @legacy_scan_el_group: attribute group for legacy scan elements attribute group
+ * @legacy_buffer_el_group: attribute group for legacy buffer attributes group
* @debugfs_dentry: device specific debugfs dentry
* @cached_reg_addr: cached register address for debugfs reads
* @read_buf: read buffer to be used for the initial reg read
@@ -28,6 +30,8 @@ struct iio_dev_opaque {
struct list_head ioctl_handlers;
const struct attribute_group **groups;
int groupcounter;
+ struct attribute_group legacy_scan_el_group;
+ struct attribute_group legacy_buffer_group;
#if defined(CONFIG_DEBUG_FS)
struct dentry *debugfs_dentry;
unsigned cached_reg_addr;
--
2.17.1
Hi Alexandru,
I love your patch! Perhaps something to improve:
[auto build test WARNING on iio/togreg]
[also build test WARNING on linux/master linus/master v5.11-rc7 next-20210125]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Alexandru-Ardelean/iio-core-buffer-add-support-for-multiple-IIO-buffers-per-IIO-device/20210210-182500
base: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg
config: h8300-randconfig-s031-20210209 (attached as .config)
compiler: h8300-linux-gcc (GCC) 9.3.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.3-215-g0fb77bb6-dirty
# https://github.com/0day-ci/linux/commit/9240fca112896274a76973066ca456b5b87eeb8c
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Alexandru-Ardelean/iio-core-buffer-add-support-for-multiple-IIO-buffers-per-IIO-device/20210210-182500
git checkout 9240fca112896274a76973066ca456b5b87eeb8c
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=h8300
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <[email protected]>
"sparse warnings: (new ones prefixed by >>)"
>> drivers/iio/industrialio-buffer.c:209:24: sparse: sparse: incorrect type in return expression (different base types) @@ expected restricted __poll_t @@ got int @@
drivers/iio/industrialio-buffer.c:209:24: sparse: expected restricted __poll_t
drivers/iio/industrialio-buffer.c:209:24: sparse: got int
vim +209 drivers/iio/industrialio-buffer.c
200
201 __poll_t iio_buffer_poll_wrapper(struct file *filp,
202 struct poll_table_struct *wait)
203 {
204 struct iio_dev_buffer_pair *ib = filp->private_data;
205 struct iio_buffer *rb = ib->buffer;
206
207 /* check if buffer was opened through new API */
208 if (test_bit(IIO_BUSY_BIT_POS, &rb->flags))
> 209 return -EBUSY;
210
211 return iio_buffer_poll(filp, wait);
212 }
213
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/[email protected]