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authorMauro Carvalho Chehab <mchehab@s-opensource.com>2017-10-09 05:31:49 -0400
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2017-12-18 14:37:02 -0500
commit991232a929c1c93b3443fff2b228863646aae5e6 (patch)
tree6580b38ef7494b87b09804f099aac6fbd193448b /include/media/videobuf2-core.h
parentbb92895a1c68569055106a6d9bf5c330e5e6a371 (diff)
media: vb2-core: fix descriptions for VB2-only functions
When we split VB2 into an independent streaming module and a V4L2 one, some vb2-core functions started to have a wrong description: they're meant to be used only by the API-specific parts of VB2, like vb2-v4l2, as the functions that V4L2 drivers should use are all under videobuf2-v4l2.h. Correct their descriptions. Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'include/media/videobuf2-core.h')
-rw-r--r--include/media/videobuf2-core.h89
1 files changed, 49 insertions, 40 deletions
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index ce795cd0a7cc..f3ee4c7c2fb3 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -651,12 +651,14 @@ int vb2_wait_for_all_buffers(struct vb2_queue *q);
* @index: id number of the buffer.
* @pb: buffer struct passed from userspace.
*
- * Should be called from &v4l2_ioctl_ops->vidioc_querybuf ioctl handler
- * in driver.
+ * Videobuf2 core helper to implement VIDIOC_QUERYBUF() operation. It is called
+ * internally by VB2 by an API-specific handler, like ``videobuf2-v4l2.h``.
*
* The passed buffer should have been verified.
*
* This function fills the relevant information for the userspace.
+ *
+ * Return: returns zero on success; an error code otherwise.
*/
void vb2_core_querybuf(struct vb2_queue *q, unsigned int index, void *pb);
@@ -666,27 +668,26 @@ void vb2_core_querybuf(struct vb2_queue *q, unsigned int index, void *pb);
* @memory: memory type, as defined by &enum vb2_memory.
* @count: requested buffer count.
*
- * Should be called from &v4l2_ioctl_ops->vidioc_reqbufs ioctl
- * handler of a driver.
+ * Videobuf2 core helper to implement VIDIOC_REQBUF() operation. It is called
+ * internally by VB2 by an API-specific handler, like ``videobuf2-v4l2.h``.
*
* This function:
*
- * #) verifies streaming parameters passed from the userspace,
- * #) sets up the queue,
+ * #) verifies streaming parameters passed from the userspace;
+ * #) sets up the queue;
* #) negotiates number of buffers and planes per buffer with the driver
- * to be used during streaming,
+ * to be used during streaming;
* #) allocates internal buffer structures (&struct vb2_buffer), according to
- * the agreed parameters,
+ * the agreed parameters;
* #) for MMAP memory type, allocates actual video memory, using the
- * memory handling/allocation routines provided during queue initialization
+ * memory handling/allocation routines provided during queue initialization.
*
* If req->count is 0, all the memory will be freed instead.
*
* If the queue has been allocated previously by a previous vb2_core_reqbufs()
* call and the queue is not busy, memory will be reallocated.
*
- * The return values from this function are intended to be directly returned
- * from &v4l2_ioctl_ops->vidioc_reqbufs handler in driver.
+ * Return: returns zero on success; an error code otherwise.
*/
int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
unsigned int *count);
@@ -699,17 +700,17 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
* @requested_planes: number of planes requested.
* @requested_sizes: array with the size of the planes.
*
- * Should be called from &v4l2_ioctl_ops->vidioc_create_bufs ioctl handler
- * of a driver.
+ * Videobuf2 core helper to implement VIDIOC_CREATE_BUFS() operation. It is
+ * called internally by VB2 by an API-specific handler, like
+ * ``videobuf2-v4l2.h``.
*
* This function:
*
- * #) verifies parameter sanity
- * #) calls the &vb2_ops->queue_setup queue operation
- * #) performs any necessary memory allocations
+ * #) verifies parameter sanity;
+ * #) calls the &vb2_ops->queue_setup queue operation;
+ * #) performs any necessary memory allocations.
*
- * Return: the return values from this function are intended to be directly
- * returned from &v4l2_ioctl_ops->vidioc_create_bufs handler in driver.
+ * Return: returns zero on success; an error code otherwise.
*/
int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
unsigned int *count, unsigned int requested_planes,
@@ -723,16 +724,17 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
* @pb: buffer structure passed from userspace to
* &v4l2_ioctl_ops->vidioc_prepare_buf handler in driver.
*
- * Should be called from &v4l2_ioctl_ops->vidioc_prepare_buf ioctl handler
- * of a driver.
+ * Videobuf2 core helper to implement VIDIOC_PREPARE_BUF() operation. It is
+ * called internally by VB2 by an API-specific handler, like
+ * ``videobuf2-v4l2.h``.
*
* The passed buffer should have been verified.
*
- * This function calls buf_prepare callback in the driver (if provided),
- * in which driver-specific buffer initialization can be performed,
+ * This function calls vb2_ops->buf_prepare callback in the driver
+ * (if provided), in which driver-specific buffer initialization can
+ * be performed.
*
- * The return values from this function are intended to be directly returned
- * from v4l2_ioctl_ops->vidioc_prepare_buf handler in driver.
+ * Return: returns zero on success; an error code otherwise.
*/
int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb);
@@ -744,18 +746,18 @@ int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb);
* @pb: buffer structure passed from userspace to
* v4l2_ioctl_ops->vidioc_qbuf handler in driver
*
- * Should be called from v4l2_ioctl_ops->vidioc_qbuf ioctl handler of a driver.
- * The passed buffer should have been verified.
+ * Videobuf2 core helper to implement VIDIOC_QBUF() operation. It is called
+ * internally by VB2 by an API-specific handler, like ``videobuf2-v4l2.h``.
*
* This function:
*
- * #) if necessary, calls buf_prepare callback in the driver (if provided), in
- * which driver-specific buffer initialization can be performed,
+ * #) if necessary, calls &vb2_ops->buf_prepare callback in the driver
+ * (if provided), in which driver-specific buffer initialization can
+ * be performed;
* #) if streaming is on, queues the buffer in driver by the means of
* &vb2_ops->buf_queue callback for processing.
*
- * The return values from this function are intended to be directly returned
- * from v4l2_ioctl_ops->vidioc_qbuf handler in driver.
+ * Return: returns zero on success; an error code otherwise.
*/
int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb);
@@ -769,8 +771,8 @@ int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb);
* buffers ready for dequeuing are present. Normally the driver
* would be passing (file->f_flags & O_NONBLOCK) here.
*
- * Should be called from v4l2_ioctl_ops->vidioc_dqbuf ioctl handler of a driver.
- * The passed buffer should have been verified.
+ * Videobuf2 core helper to implement VIDIOC_DQBUF() operation. It is called
+ * internally by VB2 by an API-specific handler, like ``videobuf2-v4l2.h``.
*
* This function:
*
@@ -780,8 +782,7 @@ int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb);
* #) the buffer struct members are filled with relevant information for
* the userspace.
*
- * The return values from this function are intended to be directly returned
- * from v4l2_ioctl_ops->vidioc_dqbuf handler in driver.
+ * Return: returns zero on success; an error code otherwise.
*/
int vb2_core_dqbuf(struct vb2_queue *q, unsigned int *pindex, void *pb,
bool nonblocking);
@@ -793,8 +794,10 @@ int vb2_core_dqbuf(struct vb2_queue *q, unsigned int *pindex, void *pb,
* @type: type of the queue to be started.
* For V4L2, this is defined by &enum v4l2_buf_type type.
*
- * Should be called from &v4l2_ioctl_ops->vidioc_streamon ioctl handler of
- * a driver.
+ * Videobuf2 core helper to implement VIDIOC_STREAMON() operation. It is called
+ * internally by VB2 by an API-specific handler, like ``videobuf2-v4l2.h``.
+ *
+ * Return: returns zero on success; an error code otherwise.
*/
int vb2_core_streamon(struct vb2_queue *q, unsigned int type);
@@ -805,8 +808,11 @@ int vb2_core_streamon(struct vb2_queue *q, unsigned int type);
* @type: type of the queue to be started.
* For V4L2, this is defined by &enum v4l2_buf_type type.
*
- * Should be called from &v4l2_ioctl_ops->vidioc_streamon ioctl handler of
- * a driver.
+ * Videobuf2 core helper to implement VIDIOC_STREAMOFF() operation. It is
+ * called internally by VB2 by an API-specific handler, like
+ * ``videobuf2-v4l2.h``.
+ *
+ * Return: returns zero on success; an error code otherwise.
*/
int vb2_core_streamoff(struct vb2_queue *q, unsigned int type);
@@ -823,8 +829,11 @@ int vb2_core_streamoff(struct vb2_queue *q, unsigned int type);
* Currently, the only used flag is %O_CLOEXEC.
* is supported, refer to manual of open syscall for more details.
*
- * The return values from this function are intended to be directly returned
- * from v4l2_ioctl_ops->vidioc_expbuf handler in driver.
+ *
+ * Videobuf2 core helper to implement VIDIOC_EXPBUF() operation. It is called
+ * internally by VB2 by an API-specific handler, like ``videobuf2-v4l2.h``.
+ *
+ * Return: returns zero on success; an error code otherwise.
*/
int vb2_core_expbuf(struct vb2_queue *q, int *fd, unsigned int type,
unsigned int index, unsigned int plane, unsigned int flags);

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