diff options
Diffstat (limited to 'include/linux/iio/buffer.h')
| -rw-r--r-- | include/linux/iio/buffer.h | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/include/linux/iio/buffer.h b/include/linux/iio/buffer.h index b65850a41127..1600c55828e0 100644 --- a/include/linux/iio/buffer.h +++ b/include/linux/iio/buffer.h @@ -21,14 +21,15 @@ 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 * @set_length: set number of datums in buffer * @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 * * The purpose of this structure is to make the buffer element * modular as event for a given driver, different usecases may require @@ -43,7 +44,7 @@ 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); @@ -51,6 +52,8 @@ struct iio_buffer_access_funcs { int (*set_length)(struct iio_buffer *buffer, int length); void (*release)(struct iio_buffer *buffer); + + unsigned int modes; }; /** @@ -72,6 +75,7 @@ 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 +94,7 @@ struct iio_buffer { void *demux_bounce; struct list_head buffer_list; struct kref ref; + unsigned int watermark; }; /** |