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staging:iio: Add support for multiple buffers

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Route all buffer writes through the demux.
Addition or removal of a buffer results in tear down and
setup of all the buffers for a given device.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Tested-by: srinivas pandruvada <srinivas.pandruvada@intel.com>
This commit is contained in:
Jonathan Cameron
2012-06-30 20:06:00 +01:00
parent 4eb3ccf157
commit 84b36ce5f7
30 changed files with 313 additions and 210 deletions
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24
include/linux/iio/buffer.h
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@@ -66,7 +66,8 @@ struct iio_buffer_access_funcs {
* @stufftoread: [INTERN] flag to indicate new data.
* @demux_list: [INTERN] list of operations required to demux the scan.
* @demux_bounce: [INTERN] buffer for doing gather from incoming scan.
**/
* @buffer_list: [INTERN] entry in the devices list of current buffers.
*/
struct iio_buffer {
int length;
int bytes_per_datum;
@@ -81,8 +82,21 @@ struct iio_buffer {
const struct attribute_group *attrs;
struct list_head demux_list;
unsigned char *demux_bounce;
struct list_head buffer_list;
};
/**
* iio_update_buffers() - add or remove buffer from active list
* @indio_dev: device to add buffer to
* @insert_buffer: buffer to insert
* @remove_buffer: buffer_to_remove
*
* Note this will tear down the all buffering and build it up again
*/
int iio_update_buffers(struct iio_dev *indio_dev,
struct iio_buffer *insert_buffer,
struct iio_buffer *remove_buffer);
/**
* iio_buffer_init() - Initialize the buffer structure
* @buffer: buffer to be initialized
@@ -115,11 +129,11 @@ int iio_scan_mask_set(struct iio_dev *indio_dev,
struct iio_buffer *buffer, int bit);
/**
* iio_push_to_buffer() - push to a registered buffer.
* @buffer: IIO buffer structure for device
* @data: the data to push to the buffer
* iio_push_to_buffers() - push to a registered buffer.
* @indio_dev: iio_dev structure for device.
* @data: Full scan.
*/
int iio_push_to_buffer(struct iio_buffer *buffer, unsigned char *data);
int iio_push_to_buffers(struct iio_dev *indio_dev, unsigned char *data);
int iio_update_demux(struct iio_dev *indio_dev);

2
include/linux/iio/iio.h
View File

@@ -410,6 +410,7 @@ struct iio_buffer_setup_ops {
* and owner
* @event_interface: [INTERN] event chrdevs associated with interrupt lines
* @buffer: [DRIVER] any buffer present
* @buffer_list: [INTERN] list of all buffers currently attached
* @scan_bytes: [INTERN] num bytes captured to be fed to buffer demux
* @mlock: [INTERN] lock used to prevent simultaneous device state
* changes
@@ -448,6 +449,7 @@ struct iio_dev {
struct iio_event_interface *event_interface;
struct iio_buffer *buffer;
struct list_head buffer_list;
int scan_bytes;
struct mutex mlock;