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iio: Add buffer enable/disable callbacks

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This patch adds a enable and disable callback that is called when the
buffer is enabled/disabled. This can be used by buffer implementations that
need to do some setup or teardown work. E.g. a DMA based buffer can use
this to start/stop the DMA transfer.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Lars-Peter Clausen 2015-10-13 18:10:27 +02:00 • committed by Jonathan Cameron
parent b440655b89
commit e18a2ad45c
2 changed files with 43 additions and 1 deletions
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8
include/linux/iio/buffer.h
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@ -33,6 +33,11 @@ struct iio_buffer;
* storage.
* @set_bytes_per_datum:set number of bytes per datum
* @set_length: set number of datums in buffer
* @enable: called if the buffer is attached to a device and the
* device starts sampling. Calls are balanced with
* @disable.
* @disable: called if the buffer is attached to a device and the
* device stops sampling. Calles are balanced with @enable.
* @release: called when the last reference to the buffer is dropped,
* should free all resources allocated by the buffer.
* @modes: Supported operating modes by this buffer type
@ -58,6 +63,9 @@ struct iio_buffer_access_funcs {
int (*set_bytes_per_datum)(struct iio_buffer *buffer, size_t bpd);
int (*set_length)(struct iio_buffer *buffer, int length);
int (*enable)(struct iio_buffer *buffer, struct iio_dev *indio_dev);
int (*disable)(struct iio_buffer *buffer, struct iio_dev *indio_dev);
void (*release)(struct iio_buffer *buffer);
unsigned int modes;