iio: Add buffer enable/disable callbacks
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>
diff --git a/include/linux/iio/buffer.h b/include/linux/iio/buffer.h
index 4d99a53..2ec3ad5 100644
--- a/include/linux/iio/buffer.h
+++ b/include/linux/iio/buffer.h
@@ -33,6 +33,11 @@
* 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 @@
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;