From 84b36ce5f79c01f792c623f14e92ed86cdccb42f Mon Sep 17 00:00:00 2001 From: Jonathan Cameron Date: Sat, 30 Jun 2012 20:06:00 +0100 Subject: staging:iio: Add support for multiple buffers 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 Tested-by: srinivas pandruvada --- include/linux/iio/buffer.h | 24 +++++++++++++++++++----- include/linux/iio/iio.h | 2 ++ 2 files changed, 21 insertions(+), 5 deletions(-) (limited to 'include/linux/iio') diff --git a/include/linux/iio/buffer.h b/include/linux/iio/buffer.h index c629b3a1d9a9..027040569180 100644 --- a/include/linux/iio/buffer.h +++ b/include/linux/iio/buffer.h @@ -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); diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h index 7806c24e5bc8..adca93a999a7 100644 --- a/include/linux/iio/iio.h +++ b/include/linux/iio/iio.h @@ -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; -- cgit v1.2.3