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linux_dsm_epyc7002/drivers/iio/buffer/industrialio-buffer-cb.c

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iio: Move callback buffer to its own module Currently the IIO callback buffer implementation is directly built into the IIO core module when enabled. Given that the callback buffer module is standalone functionallity there is really no reason to do this. So move it to its own module. Also rename the source to follow the standard IIO module naming convention as well as add a license notice to the file. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2015-08-14 21:54:54 +07:00
/* The industrial I/O callback buffer
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*/
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
#include <linux/kernel.h>
iio: Move callback buffer to its own module Currently the IIO callback buffer implementation is directly built into the IIO core module when enabled. Given that the callback buffer module is standalone functionallity there is really no reason to do this. So move it to its own module. Also rename the source to follow the standard IIO module naming convention as well as add a license notice to the file. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2015-08-14 21:54:54 +07:00
#include <linux/module.h>
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/export.h>
iio:buffer.h include pushdown into buffer implementations These were only getting access to the internals of struct iio_dev via the include of iio.h within buffer.h. This should always have been explicitly included by the buffer implementations themselves. Signed-off-by: Jonathan Cameron <jic23@kernel.org> Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
2017-01-03 02:28:31 +07:00
#include <linux/iio/iio.h>
iio:buffer.h - split into buffer.h and buffer_impl.h buffer.h supplies everything needed for devices using buffers. buffer_impl.h supplies access to the internals as needed to write a buffer implementation. This was really motivated by the mess that turned up in the kernel-doc documentation pulled in by the new sphinx docs. It made it clear that our logical separations in headers were generally terrible. The buffer case was easy to sort out without greatly effecting drivers so here it is. Signed-off-by: Jonathan Cameron <jic23@kernel.org> Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
2017-01-03 02:28:34 +07:00
#include <linux/iio/buffer_impl.h>
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
#include <linux/iio/consumer.h>
struct iio_cb_buffer {
struct iio_buffer buffer;
iio: iio_push_to_buffers(): Change type of 'data' to const void * Change the type of the 'data' parameter for iio_push_to_buffers() from 'u8 *' to 'const void *'. Drivers typically use the correct type (e.g. __be16 *) for their data buffer. When passing the buffer to iio_push_to_buffers() it needs to be cast to 'u8 *' for the compiler to not complain (and also having to add __force if we want to keep sparse happy as well). Since the buffer implementation should not care about the data layout (except the size of one sample) using a void pointer is the correct thing to do. Also make it const as the buffer implementations are not supposed to modify it. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2013-09-15 23:50:00 +07:00
int (*cb)(const void *data, void *private);
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
void *private;
struct iio_channel *channels;
iio: buffer-callback: allow getting underlying iio_dev Add iio_channel_cb_get_iio_dev function to allow getting the underlying iio_dev. This is useful for setting the trigger of the consumer ADC device. Signed-off-by: Matt Ranostay <mranostay@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2016-08-20 10:17:02 +07:00
struct iio_dev *indio_dev;
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
};
iio: Add reference counting for buffers Since the buffer is accessed by userspace we can not just free the buffers memory once we are done with it in kernel space. There might still be open file descriptors and userspace still might be accessing the buffer. This patch adds support for reference counting to the IIO buffers. When a buffer is created and initialized its initial reference count is set to 1. Instead of freeing the memory of the buffer the buffer's _free() function will drop that reference again. But only after the last reference to the buffer has been dropped the buffer the buffer's memory will be freed. The IIO device will take a reference to its primary buffer. The patch adds a small helper function for this called iio_device_attach_buffer() which will get a reference to the buffer and assign the buffer to the IIO device. This function must be used instead of assigning the buffer to the device by hand. The reference is only dropped once the IIO device is freed and we can be sure that there are no more open file handles. A reference to a buffer will also be taken whenever the buffer is active to avoid the buffer being freed while data is still being send to it. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2013-10-04 18:06:00 +07:00
static struct iio_cb_buffer *buffer_to_cb_buffer(struct iio_buffer *buffer)
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
{
iio: Add reference counting for buffers Since the buffer is accessed by userspace we can not just free the buffers memory once we are done with it in kernel space. There might still be open file descriptors and userspace still might be accessing the buffer. This patch adds support for reference counting to the IIO buffers. When a buffer is created and initialized its initial reference count is set to 1. Instead of freeing the memory of the buffer the buffer's _free() function will drop that reference again. But only after the last reference to the buffer has been dropped the buffer the buffer's memory will be freed. The IIO device will take a reference to its primary buffer. The patch adds a small helper function for this called iio_device_attach_buffer() which will get a reference to the buffer and assign the buffer to the IIO device. This function must be used instead of assigning the buffer to the device by hand. The reference is only dropped once the IIO device is freed and we can be sure that there are no more open file handles. A reference to a buffer will also be taken whenever the buffer is active to avoid the buffer being freed while data is still being send to it. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2013-10-04 18:06:00 +07:00
return container_of(buffer, struct iio_cb_buffer, buffer);
}
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
iio: Add reference counting for buffers Since the buffer is accessed by userspace we can not just free the buffers memory once we are done with it in kernel space. There might still be open file descriptors and userspace still might be accessing the buffer. This patch adds support for reference counting to the IIO buffers. When a buffer is created and initialized its initial reference count is set to 1. Instead of freeing the memory of the buffer the buffer's _free() function will drop that reference again. But only after the last reference to the buffer has been dropped the buffer the buffer's memory will be freed. The IIO device will take a reference to its primary buffer. The patch adds a small helper function for this called iio_device_attach_buffer() which will get a reference to the buffer and assign the buffer to the IIO device. This function must be used instead of assigning the buffer to the device by hand. The reference is only dropped once the IIO device is freed and we can be sure that there are no more open file handles. A reference to a buffer will also be taken whenever the buffer is active to avoid the buffer being freed while data is still being send to it. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2013-10-04 18:06:00 +07:00
static int iio_buffer_cb_store_to(struct iio_buffer *buffer, const void *data)
{
struct iio_cb_buffer *cb_buff = buffer_to_cb_buffer(buffer);
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
return cb_buff->cb(data, cb_buff->private);
}
iio: Add reference counting for buffers Since the buffer is accessed by userspace we can not just free the buffers memory once we are done with it in kernel space. There might still be open file descriptors and userspace still might be accessing the buffer. This patch adds support for reference counting to the IIO buffers. When a buffer is created and initialized its initial reference count is set to 1. Instead of freeing the memory of the buffer the buffer's _free() function will drop that reference again. But only after the last reference to the buffer has been dropped the buffer the buffer's memory will be freed. The IIO device will take a reference to its primary buffer. The patch adds a small helper function for this called iio_device_attach_buffer() which will get a reference to the buffer and assign the buffer to the IIO device. This function must be used instead of assigning the buffer to the device by hand. The reference is only dropped once the IIO device is freed and we can be sure that there are no more open file handles. A reference to a buffer will also be taken whenever the buffer is active to avoid the buffer being freed while data is still being send to it. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2013-10-04 18:06:00 +07:00
static void iio_buffer_cb_release(struct iio_buffer *buffer)
{
struct iio_cb_buffer *cb_buff = buffer_to_cb_buffer(buffer);
kfree(cb_buff->buffer.scan_mask);
kfree(cb_buff);
}
iio:buffer_cb: Constify iio_cb_access The iio_cb_access struct is never modified so we can mark it as const. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2013-09-15 23:09:00 +07:00
static const struct iio_buffer_access_funcs iio_cb_access = {
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
.store_to = &iio_buffer_cb_store_to,
iio: Add reference counting for buffers Since the buffer is accessed by userspace we can not just free the buffers memory once we are done with it in kernel space. There might still be open file descriptors and userspace still might be accessing the buffer. This patch adds support for reference counting to the IIO buffers. When a buffer is created and initialized its initial reference count is set to 1. Instead of freeing the memory of the buffer the buffer's _free() function will drop that reference again. But only after the last reference to the buffer has been dropped the buffer the buffer's memory will be freed. The IIO device will take a reference to its primary buffer. The patch adds a small helper function for this called iio_device_attach_buffer() which will get a reference to the buffer and assign the buffer to the IIO device. This function must be used instead of assigning the buffer to the device by hand. The reference is only dropped once the IIO device is freed and we can be sure that there are no more open file handles. A reference to a buffer will also be taken whenever the buffer is active to avoid the buffer being freed while data is still being send to it. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2013-10-04 18:06:00 +07:00
.release = &iio_buffer_cb_release,
iio: Specify supported modes for buffers For each buffer type specify the supported device modes for this buffer. This allows us for devices which support multiple different operating modes to pick the correct operating mode based on the modes supported by the attached buffers. It also prevents that buffers with conflicting modes are attached to a device at the same time or that a buffer with a non-supported mode is attached to a device (e.g. in-kernel callback buffer to a device only supporting hardware mode). Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2015-05-29 23:14:21 +07:00
.modes = INDIO_BUFFER_SOFTWARE | INDIO_BUFFER_TRIGGERED,
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
};
iio: Update iio_channel_get_all and iio_channel_get_all_cb API Pass device pointer instead of device name as parameter to iio_channel_get_all and iio_channel_get_all_cb. This will enable us to use OF information to retrieve consumer channel information. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2013-02-01 04:43:00 +07:00
struct iio_cb_buffer *iio_channel_get_all_cb(struct device *dev,
iio: iio_push_to_buffers(): Change type of 'data' to const void * Change the type of the 'data' parameter for iio_push_to_buffers() from 'u8 *' to 'const void *'. Drivers typically use the correct type (e.g. __be16 *) for their data buffer. When passing the buffer to iio_push_to_buffers() it needs to be cast to 'u8 *' for the compiler to not complain (and also having to add __force if we want to keep sparse happy as well). Since the buffer implementation should not care about the data layout (except the size of one sample) using a void pointer is the correct thing to do. Also make it const as the buffer implementations are not supposed to modify it. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2013-09-15 23:50:00 +07:00
int (*cb)(const void *data,
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
void *private),
void *private)
{
int ret;
struct iio_cb_buffer *cb_buff;
struct iio_channel *chan;
cb_buff = kzalloc(sizeof(*cb_buff), GFP_KERNEL);
iio get rid of unneccessary error_ret Get rid of obsolete uses of goto error_ret and some empty lines. Signed-off-by: Hartmut Knaack <knaack.h@gmx.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2014-02-16 18:53:00 +07:00
if (cb_buff == NULL)
return ERR_PTR(-ENOMEM);
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
iio:buffer_cb: Add missing iio_buffer_init() Make sure to properly initialize the IIO buffer data structure. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2013-09-19 03:02:00 +07:00
iio_buffer_init(&cb_buff->buffer);
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
cb_buff->private = private;
cb_buff->cb = cb;
cb_buff->buffer.access = &iio_cb_access;
INIT_LIST_HEAD(&cb_buff->buffer.demux_list);
iio: Update iio_channel_get_all and iio_channel_get_all_cb API Pass device pointer instead of device name as parameter to iio_channel_get_all and iio_channel_get_all_cb. This will enable us to use OF information to retrieve consumer channel information. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2013-02-01 04:43:00 +07:00
cb_buff->channels = iio_channel_get_all(dev);
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
if (IS_ERR(cb_buff->channels)) {
ret = PTR_ERR(cb_buff->channels);
goto error_free_cb_buff;
}
iio: buffer-callback: allow getting underlying iio_dev Add iio_channel_cb_get_iio_dev function to allow getting the underlying iio_dev. This is useful for setting the trigger of the consumer ADC device. Signed-off-by: Matt Ranostay <mranostay@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2016-08-20 10:17:02 +07:00
cb_buff->indio_dev = cb_buff->channels[0].indio_dev;
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
cb_buff->buffer.scan_mask
iio: buffer-callback: allow getting underlying iio_dev Add iio_channel_cb_get_iio_dev function to allow getting the underlying iio_dev. This is useful for setting the trigger of the consumer ADC device. Signed-off-by: Matt Ranostay <mranostay@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2016-08-20 10:17:02 +07:00
= kcalloc(BITS_TO_LONGS(cb_buff->indio_dev->masklength),
sizeof(long), GFP_KERNEL);
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
if (cb_buff->buffer.scan_mask == NULL) {
ret = -ENOMEM;
goto error_release_channels;
}
chan = &cb_buff->channels[0];
while (chan->indio_dev) {
iio: buffer-callback: allow getting underlying iio_dev Add iio_channel_cb_get_iio_dev function to allow getting the underlying iio_dev. This is useful for setting the trigger of the consumer ADC device. Signed-off-by: Matt Ranostay <mranostay@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2016-08-20 10:17:02 +07:00
if (chan->indio_dev != cb_buff->indio_dev) {
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
ret = -EINVAL;
iio:callback buffer: free the scan_mask Reported-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2013-05-23 04:41:00 +07:00
goto error_free_scan_mask;
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
}
set_bit(chan->channel->scan_index,
cb_buff->buffer.scan_mask);
chan++;
}
return cb_buff;
iio:callback buffer: free the scan_mask Reported-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2013-05-23 04:41:00 +07:00
error_free_scan_mask:
kfree(cb_buff->buffer.scan_mask);
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
error_release_channels:
iio_channel_release_all(cb_buff->channels);
error_free_cb_buff:
kfree(cb_buff);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(iio_channel_get_all_cb);
IIO: consumer: allow to set buffer sizes Add iio consumer API to set buffer size and watermark according to sysfs API. Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2018-01-10 17:13:13 +07:00
int iio_channel_cb_set_buffer_watermark(struct iio_cb_buffer *cb_buff,
size_t watermark)
{
if (!watermark)
return -EINVAL;
cb_buff->buffer.watermark = watermark;
return 0;
}
EXPORT_SYMBOL_GPL(iio_channel_cb_set_buffer_watermark);
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
int iio_channel_start_all_cb(struct iio_cb_buffer *cb_buff)
{
iio: buffer-callback: allow getting underlying iio_dev Add iio_channel_cb_get_iio_dev function to allow getting the underlying iio_dev. This is useful for setting the trigger of the consumer ADC device. Signed-off-by: Matt Ranostay <mranostay@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2016-08-20 10:17:02 +07:00
return iio_update_buffers(cb_buff->indio_dev, &cb_buff->buffer,
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
NULL);
}
EXPORT_SYMBOL_GPL(iio_channel_start_all_cb);
void iio_channel_stop_all_cb(struct iio_cb_buffer *cb_buff)
{
iio: buffer-callback: allow getting underlying iio_dev Add iio_channel_cb_get_iio_dev function to allow getting the underlying iio_dev. This is useful for setting the trigger of the consumer ADC device. Signed-off-by: Matt Ranostay <mranostay@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2016-08-20 10:17:02 +07:00
iio_update_buffers(cb_buff->indio_dev, NULL, &cb_buff->buffer);
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
}
EXPORT_SYMBOL_GPL(iio_channel_stop_all_cb);
void iio_channel_release_all_cb(struct iio_cb_buffer *cb_buff)
{
iio_channel_release_all(cb_buff->channels);
iio: Add reference counting for buffers Since the buffer is accessed by userspace we can not just free the buffers memory once we are done with it in kernel space. There might still be open file descriptors and userspace still might be accessing the buffer. This patch adds support for reference counting to the IIO buffers. When a buffer is created and initialized its initial reference count is set to 1. Instead of freeing the memory of the buffer the buffer's _free() function will drop that reference again. But only after the last reference to the buffer has been dropped the buffer the buffer's memory will be freed. The IIO device will take a reference to its primary buffer. The patch adds a small helper function for this called iio_device_attach_buffer() which will get a reference to the buffer and assign the buffer to the IIO device. This function must be used instead of assigning the buffer to the device by hand. The reference is only dropped once the IIO device is freed and we can be sure that there are no more open file handles. A reference to a buffer will also be taken whenever the buffer is active to avoid the buffer being freed while data is still being send to it. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2013-10-04 18:06:00 +07:00
iio_buffer_put(&cb_buff->buffer);
staging:iio: add a callback buffer for in kernel push interface This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2012-07-01 02:06:00 +07:00
}
EXPORT_SYMBOL_GPL(iio_channel_release_all_cb);
struct iio_channel
*iio_channel_cb_get_channels(const struct iio_cb_buffer *cb_buffer)
{
return cb_buffer->channels;
}
EXPORT_SYMBOL_GPL(iio_channel_cb_get_channels);
iio: Move callback buffer to its own module Currently the IIO callback buffer implementation is directly built into the IIO core module when enabled. Given that the callback buffer module is standalone functionallity there is really no reason to do this. So move it to its own module. Also rename the source to follow the standard IIO module naming convention as well as add a license notice to the file. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2015-08-14 21:54:54 +07:00
iio: buffer-callback: allow getting underlying iio_dev Add iio_channel_cb_get_iio_dev function to allow getting the underlying iio_dev. This is useful for setting the trigger of the consumer ADC device. Signed-off-by: Matt Ranostay <mranostay@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2016-08-20 10:17:02 +07:00
struct iio_dev
*iio_channel_cb_get_iio_dev(const struct iio_cb_buffer *cb_buffer)
{
return cb_buffer->indio_dev;
}
EXPORT_SYMBOL_GPL(iio_channel_cb_get_iio_dev);
iio: Move callback buffer to its own module Currently the IIO callback buffer implementation is directly built into the IIO core module when enabled. Given that the callback buffer module is standalone functionallity there is really no reason to do this. So move it to its own module. Also rename the source to follow the standard IIO module naming convention as well as add a license notice to the file. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2015-08-14 21:54:54 +07:00
MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
MODULE_DESCRIPTION("Industrial I/O callback buffer");
MODULE_LICENSE("GPL");
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