From 92d1079b281f89f1c65c6aece3cfab4fb422c797 Mon Sep 17 00:00:00 2001 From: Jonathan Cameron Date: Sat, 30 Jun 2012 20:06:00 +0100 Subject: 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 --- include/linux/iio/consumer.h | 46 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) (limited to 'include/linux') diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h index 57efee63a6da..126c0a9375f2 100644 --- a/include/linux/iio/consumer.h +++ b/include/linux/iio/consumer.h @@ -61,6 +61,52 @@ struct iio_channel *iio_channel_get_all(const char *name); */ void iio_channel_release_all(struct iio_channel *chan); +struct iio_cb_buffer; +/** + * iio_channel_get_all_cb() - register callback for triggered capture + * @name: Name of client device. + * @cb: Callback function. + * @private: Private data passed to callback. + * + * NB right now we have no ability to mux data from multiple devices. + * So if the channels requested come from different devices this will + * fail. + */ +struct iio_cb_buffer *iio_channel_get_all_cb(const char *name, + int (*cb)(u8 *data, + void *private), + void *private); +/** + * iio_channel_release_all_cb() - release and unregister the callback. + * @cb_buffer: The callback buffer that was allocated. + */ +void iio_channel_release_all_cb(struct iio_cb_buffer *cb_buffer); + +/** + * iio_channel_start_all_cb() - start the flow of data through callback. + * @cb_buff: The callback buffer we are starting. + */ +int iio_channel_start_all_cb(struct iio_cb_buffer *cb_buff); + +/** + * iio_channel_stop_all_cb() - stop the flow of data through the callback. + * @cb_buff: The callback buffer we are stopping. + */ +void iio_channel_stop_all_cb(struct iio_cb_buffer *cb_buff); + +/** + * iio_channel_cb_get_channels() - get access to the underlying channels. + * @cb_buff: The callback buffer from whom we want the channel + * information. + * + * This function allows one to obtain information about the channels. + * Whilst this may allow direct reading if all buffers are disabled, the + * primary aim is to allow drivers that are consuming a channel to query + * things like scaling of the channel. + */ +struct iio_channel +*iio_channel_cb_get_channels(const struct iio_cb_buffer *cb_buffer); + /** * iio_read_channel_raw() - read from a given channel * @chan: The channel being queried. -- cgit v1.2.3