media: videodev2.h: add new capabilities for buffer types

VIDIOC_REQBUFS and VIDIOC_CREATE_BUFFERS will return capabilities
telling userspace what the given buffer type is capable of.

Signed-off-by: Hans Verkuil <hansverk@cisco.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

1 files changed, 11 insertions, 2 deletions

diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 2350151ce4ea..55d45a387dd2 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -856,9 +856,16 @@ struct v4l2_requestbuffers {
         __u32                   count;
         __u32                   type;           /* enum v4l2_buf_type */
         __u32                   memory;         /* enum v4l2_memory */
-        __u32                   reserved[2];
+        __u32                   capabilities;
+        __u32                   reserved[1];
 };
 
+/* capabilities for struct v4l2_requestbuffers and v4l2_create_buffers */
+#define V4L2_BUF_CAP_SUPPORTS_MMAP      (1 << 0)
+#define V4L2_BUF_CAP_SUPPORTS_USERPTR   (1 << 1)
+#define V4L2_BUF_CAP_SUPPORTS_DMABUF    (1 << 2)
+#define V4L2_BUF_CAP_SUPPORTS_REQUESTS  (1 << 3)
+
 /**
  * struct v4l2_plane - plane info for multi-planar buffers
  * @bytesused:          number of bytes occupied by data in the plane (payload)
@@ -2319,6 +2326,7 @@ struct v4l2_dbg_chip_info {
  *              return: number of created buffers
  * @memory:     enum v4l2_memory; buffer memory type
  * @format:     frame format, for which buffers are requested
+ * @capabilities: capabilities of this buffer type.
  * @reserved:   future extensions
  */
 struct v4l2_create_buffers {
@@ -2326,7 +2334,8 @@ struct v4l2_create_buffers {
         __u32                   count;
         __u32                   memory;
         struct v4l2_format      format;
-        __u32                   reserved[8];
+        __u32                   capabilities;
+        __u32                   reserved[7];
 };
 
 /*