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Diffstat (limited to 'include/linux/iio/buffer.h')
-rw-r--r--include/linux/iio/buffer.h8
1 files changed, 5 insertions, 3 deletions
diff --git a/include/linux/iio/buffer.h b/include/linux/iio/buffer.h
index b65850a41127..eb8622b78ec9 100644
--- a/include/linux/iio/buffer.h
+++ b/include/linux/iio/buffer.h
@@ -21,8 +21,8 @@ struct iio_buffer;
* struct iio_buffer_access_funcs - access functions for buffers.
* @store_to: actually store stuff to the buffer
* @read_first_n: try to get a specified number of bytes (must exist)
- * @data_available: indicates whether data for reading from the buffer is
- * available.
+ * @data_available: indicates how much data is available for reading from
+ * the buffer.
* @request_update: if a parameter change has been marked, update underlying
* storage.
* @set_bytes_per_datum:set number of bytes per datum
@@ -43,7 +43,7 @@ struct iio_buffer_access_funcs {
int (*read_first_n)(struct iio_buffer *buffer,
size_t n,
char __user *buf);
- bool (*data_available)(struct iio_buffer *buffer);
+ size_t (*data_available)(struct iio_buffer *buffer);
int (*request_update)(struct iio_buffer *buffer);
@@ -72,6 +72,7 @@ struct iio_buffer_access_funcs {
* @demux_bounce: [INTERN] buffer for doing gather from incoming scan.
* @buffer_list: [INTERN] entry in the devices list of current buffers.
* @ref: [INTERN] reference count of the buffer.
+ * @watermark: [INTERN] number of datums to wait for poll/read.
*/
struct iio_buffer {
int length;
@@ -90,6 +91,7 @@ struct iio_buffer {
void *demux_bounce;
struct list_head buffer_list;
struct kref ref;
+ unsigned int watermark;
};
/**