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media: vb2-core: document remaining functions

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There are several VB2 core functions that aren't documented.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2017-10-07 05:05:03 -04:00
parent 2b14132455
commit 8dcde47ff8
1 changed files with 53 additions and 1 deletions
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54
include/media/videobuf2-core.h
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@ -786,7 +786,28 @@ int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb);
int vb2_core_dqbuf(struct vb2_queue *q, unsigned int *pindex, void *pb,
bool nonblocking);
/**
* vb2_core_streamon() - Implements VB2 stream ON logic
*
* @q: pointer to &struct vb2_queue with videobuf2 queue
* @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.
*/
int vb2_core_streamon(struct vb2_queue *q, unsigned int type);
/**
* vb2_core_streamoff() - Implements VB2 stream OFF logic
*
* @q: pointer to &struct vb2_queue with videobuf2 queue
* @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.
*/
int vb2_core_streamoff(struct vb2_queue *q, unsigned int type);
/**
@ -874,6 +895,21 @@ void vb2_queue_error(struct vb2_queue *q);
int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma);
#ifndef CONFIG_MMU
/**
* vb2_get_unmapped_area - map video buffers into application address space.
* @q: pointer to &struct vb2_queue with videobuf2 queue.
* @addr: memory address.
* @len: buffer size.
* @pgoff: page offset.
* @flags: memory flags.
*
* This function is used in noMMU platforms to propose address mapping
* for a given buffer. It's intended to be used as a handler for the
* &file_operations->get_unmapped_area operation.
*
* This is called by the mmap() syscall routines will call this
* to get a proposed address for the mapping, when ``!CONFIG_MMU``.
*/
unsigned long vb2_get_unmapped_area(struct vb2_queue *q,
unsigned long addr,
unsigned long len,
@ -882,7 +918,7 @@ unsigned long vb2_get_unmapped_area(struct vb2_queue *q,
#endif
/**
* vb2_core_poll() - implements poll userspace operation.
* vb2_core_poll() - implements poll syscall() logic.
* @q: pointer to &struct vb2_queue with videobuf2 queue.
* @file: &struct file argument passed to the poll
* file operation handler.
@ -902,8 +938,24 @@ unsigned long vb2_get_unmapped_area(struct vb2_queue *q,
unsigned int vb2_core_poll(struct vb2_queue *q, struct file *file,
poll_table *wait);
/**
* vb2_read() - implements read() syscall logic.
* @q: pointer to &struct vb2_queue with videobuf2 queue.
* @data: pointed to target userspace buffer
* @count: number of bytes to read
* @ppos: file handle position tracking pointer
* @nonblock: mode selector (1 means blocking calls, 0 means nonblocking)
*/
size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count,
loff_t *ppos, int nonblock);
/**
* vb2_read() - implements write() syscall logic.
* @q: pointer to &struct vb2_queue with videobuf2 queue.
* @data: pointed to target userspace buffer
* @count: number of bytes to write
* @ppos: file handle position tracking pointer
* @nonblock: mode selector (1 means blocking calls, 0 means nonblocking)
*/
size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count,
loff_t *ppos, int nonblock);