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950720840f
Signed-off-by: Pawel Osciak <pawel@osciak.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
381 lines
13 KiB
C
381 lines
13 KiB
C
/*
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* videobuf2-core.h - V4L2 driver helper framework
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*
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* Copyright (C) 2010 Samsung Electronics
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*
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* Author: Pawel Osciak <pawel@osciak.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation.
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*/
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#ifndef _MEDIA_VIDEOBUF2_CORE_H
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#define _MEDIA_VIDEOBUF2_CORE_H
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#include <linux/mm_types.h>
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#include <linux/mutex.h>
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#include <linux/poll.h>
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#include <linux/videodev2.h>
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struct vb2_alloc_ctx;
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struct vb2_fileio_data;
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/**
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* struct vb2_mem_ops - memory handling/memory allocator operations
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* @alloc: allocate video memory and, optionally, allocator private data,
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* return NULL on failure or a pointer to allocator private,
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* per-buffer data on success; the returned private structure
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* will then be passed as buf_priv argument to other ops in this
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* structure
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* @put: inform the allocator that the buffer will no longer be used;
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* usually will result in the allocator freeing the buffer (if
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* no other users of this buffer are present); the buf_priv
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* argument is the allocator private per-buffer structure
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* previously returned from the alloc callback
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* @get_userptr: acquire userspace memory for a hardware operation; used for
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* USERPTR memory types; vaddr is the address passed to the
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* videobuf layer when queuing a video buffer of USERPTR type;
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* should return an allocator private per-buffer structure
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* associated with the buffer on success, NULL on failure;
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* the returned private structure will then be passed as buf_priv
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* argument to other ops in this structure
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* @put_userptr: inform the allocator that a USERPTR buffer will no longer
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* be used
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* @vaddr: return a kernel virtual address to a given memory buffer
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* associated with the passed private structure or NULL if no
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* such mapping exists
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* @cookie: return allocator specific cookie for a given memory buffer
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* associated with the passed private structure or NULL if not
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* available
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* @num_users: return the current number of users of a memory buffer;
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* return 1 if the videobuf layer (or actually the driver using
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* it) is the only user
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* @mmap: setup a userspace mapping for a given memory buffer under
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* the provided virtual memory region
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*
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* Required ops for USERPTR types: get_userptr, put_userptr.
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* Required ops for MMAP types: alloc, put, num_users, mmap.
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* Required ops for read/write access types: alloc, put, num_users, vaddr
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*/
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struct vb2_mem_ops {
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void *(*alloc)(void *alloc_ctx, unsigned long size);
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void (*put)(void *buf_priv);
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void *(*get_userptr)(void *alloc_ctx, unsigned long vaddr,
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unsigned long size, int write);
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void (*put_userptr)(void *buf_priv);
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void *(*vaddr)(void *buf_priv);
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void *(*cookie)(void *buf_priv);
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unsigned int (*num_users)(void *buf_priv);
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int (*mmap)(void *buf_priv, struct vm_area_struct *vma);
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};
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struct vb2_plane {
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void *mem_priv;
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int mapped:1;
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};
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/**
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* enum vb2_io_modes - queue access methods
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* @VB2_MMAP: driver supports MMAP with streaming API
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* @VB2_USERPTR: driver supports USERPTR with streaming API
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* @VB2_READ: driver supports read() style access
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* @VB2_WRITE: driver supports write() style access
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*/
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enum vb2_io_modes {
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VB2_MMAP = (1 << 0),
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VB2_USERPTR = (1 << 1),
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VB2_READ = (1 << 2),
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VB2_WRITE = (1 << 3),
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};
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/**
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* enum vb2_fileio_flags - flags for selecting a mode of the file io emulator,
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* by default the 'streaming' style is used by the file io emulator
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* @VB2_FILEIO_READ_ONCE: report EOF after reading the first buffer
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* @VB2_FILEIO_WRITE_IMMEDIATELY: queue buffer after each write() call
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*/
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enum vb2_fileio_flags {
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VB2_FILEIO_READ_ONCE = (1 << 0),
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VB2_FILEIO_WRITE_IMMEDIATELY = (1 << 1),
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};
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/**
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* enum vb2_buffer_state - current video buffer state
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* @VB2_BUF_STATE_DEQUEUED: buffer under userspace control
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* @VB2_BUF_STATE_QUEUED: buffer queued in videobuf, but not in driver
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* @VB2_BUF_STATE_ACTIVE: buffer queued in driver and possibly used
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* in a hardware operation
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* @VB2_BUF_STATE_DONE: buffer returned from driver to videobuf, but
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* not yet dequeued to userspace
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* @VB2_BUF_STATE_ERROR: same as above, but the operation on the buffer
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* has ended with an error, which will be reported
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* to the userspace when it is dequeued
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*/
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enum vb2_buffer_state {
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VB2_BUF_STATE_DEQUEUED,
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VB2_BUF_STATE_QUEUED,
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VB2_BUF_STATE_ACTIVE,
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VB2_BUF_STATE_DONE,
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VB2_BUF_STATE_ERROR,
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};
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struct vb2_queue;
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/**
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* struct vb2_buffer - represents a video buffer
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* @v4l2_buf: struct v4l2_buffer associated with this buffer; can
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* be read by the driver and relevant entries can be
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* changed by the driver in case of CAPTURE types
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* (such as timestamp)
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* @v4l2_planes: struct v4l2_planes associated with this buffer; can
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* be read by the driver and relevant entries can be
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* changed by the driver in case of CAPTURE types
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* (such as bytesused); NOTE that even for single-planar
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* types, the v4l2_planes[0] struct should be used
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* instead of v4l2_buf for filling bytesused - drivers
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* should use the vb2_set_plane_payload() function for that
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* @vb2_queue: the queue to which this driver belongs
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* @num_planes: number of planes in the buffer
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* on an internal driver queue
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* @state: current buffer state; do not change
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* @queued_entry: entry on the queued buffers list, which holds all
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* buffers queued from userspace
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* @done_entry: entry on the list that stores all buffers ready to
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* be dequeued to userspace
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* @planes: private per-plane information; do not change
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* @num_planes_mapped: number of mapped planes; do not change
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*/
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struct vb2_buffer {
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struct v4l2_buffer v4l2_buf;
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struct v4l2_plane v4l2_planes[VIDEO_MAX_PLANES];
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struct vb2_queue *vb2_queue;
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unsigned int num_planes;
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/* Private: internal use only */
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enum vb2_buffer_state state;
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struct list_head queued_entry;
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struct list_head done_entry;
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struct vb2_plane planes[VIDEO_MAX_PLANES];
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unsigned int num_planes_mapped;
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};
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/**
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* struct vb2_ops - driver-specific callbacks
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*
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* @queue_setup: called from a VIDIOC_REQBUFS handler, before
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* memory allocation; driver should return the required
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* number of buffers in num_buffers, the required number
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* of planes per buffer in num_planes; the size of each
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* plane should be set in the sizes[] array and optional
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* per-plane allocator specific context in alloc_ctxs[]
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* array
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* @wait_prepare: release any locks taken while calling vb2 functions;
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* it is called before an ioctl needs to wait for a new
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* buffer to arrive; required to avoid a deadlock in
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* blocking access type
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* @wait_finish: reacquire all locks released in the previous callback;
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* required to continue operation after sleeping while
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* waiting for a new buffer to arrive
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* @buf_init: called once after allocating a buffer (in MMAP case)
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* or after acquiring a new USERPTR buffer; drivers may
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* perform additional buffer-related initialization;
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* initialization failure (return != 0) will prevent
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* queue setup from completing successfully; optional
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* @buf_prepare: called every time the buffer is queued from userspace;
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* drivers may perform any initialization required before
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* each hardware operation in this callback;
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* if an error is returned, the buffer will not be queued
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* in driver; optional
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* @buf_finish: called before every dequeue of the buffer back to
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* userspace; drivers may perform any operations required
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* before userspace accesses the buffer; optional
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* @buf_cleanup: called once before the buffer is freed; drivers may
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* perform any additional cleanup; optional
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* @start_streaming: called once before entering 'streaming' state; enables
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* driver to receive buffers over buf_queue() callback
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* @stop_streaming: called when 'streaming' state must be disabled; driver
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* should stop any DMA transactions or wait until they
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* finish and give back all buffers it got from buf_queue()
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* callback; may use vb2_wait_for_all_buffers() function
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* @buf_queue: passes buffer vb to the driver; driver may start
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* hardware operation on this buffer; driver should give
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* the buffer back by calling vb2_buffer_done() function
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*/
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struct vb2_ops {
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int (*queue_setup)(struct vb2_queue *q, unsigned int *num_buffers,
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unsigned int *num_planes, unsigned long sizes[],
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void *alloc_ctxs[]);
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void (*wait_prepare)(struct vb2_queue *q);
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void (*wait_finish)(struct vb2_queue *q);
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int (*buf_init)(struct vb2_buffer *vb);
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int (*buf_prepare)(struct vb2_buffer *vb);
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int (*buf_finish)(struct vb2_buffer *vb);
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void (*buf_cleanup)(struct vb2_buffer *vb);
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int (*start_streaming)(struct vb2_queue *q);
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int (*stop_streaming)(struct vb2_queue *q);
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void (*buf_queue)(struct vb2_buffer *vb);
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};
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/**
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* struct vb2_queue - a videobuf queue
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*
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* @type: queue type (see V4L2_BUF_TYPE_* in linux/videodev2.h
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* @io_modes: supported io methods (see vb2_io_modes enum)
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* @io_flags: additional io flags (see vb2_fileio_flags enum)
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* @ops: driver-specific callbacks
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* @mem_ops: memory allocator specific callbacks
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* @drv_priv: driver private data
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* @buf_struct_size: size of the driver-specific buffer structure;
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* "0" indicates the driver doesn't want to use a custom buffer
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* structure type, so sizeof(struct vb2_buffer) will is used
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*
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* @memory: current memory type used
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* @bufs: videobuf buffer structures
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* @num_buffers: number of allocated/used buffers
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* @queued_list: list of buffers currently queued from userspace
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* @queued_count: number of buffers owned by the driver
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* @done_list: list of buffers ready to be dequeued to userspace
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* @done_lock: lock to protect done_list list
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* @done_wq: waitqueue for processes waiting for buffers ready to be dequeued
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* @alloc_ctx: memory type/allocator-specific contexts for each plane
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* @streaming: current streaming state
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* @fileio: file io emulator internal data, used only if emulator is active
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*/
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struct vb2_queue {
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enum v4l2_buf_type type;
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unsigned int io_modes;
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unsigned int io_flags;
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const struct vb2_ops *ops;
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const struct vb2_mem_ops *mem_ops;
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void *drv_priv;
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unsigned int buf_struct_size;
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/* private: internal use only */
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enum v4l2_memory memory;
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struct vb2_buffer *bufs[VIDEO_MAX_FRAME];
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unsigned int num_buffers;
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struct list_head queued_list;
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atomic_t queued_count;
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struct list_head done_list;
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spinlock_t done_lock;
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wait_queue_head_t done_wq;
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void *alloc_ctx[VIDEO_MAX_PLANES];
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unsigned int streaming:1;
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struct vb2_fileio_data *fileio;
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};
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void *vb2_plane_vaddr(struct vb2_buffer *vb, unsigned int plane_no);
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void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no);
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void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state);
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int vb2_wait_for_all_buffers(struct vb2_queue *q);
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int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b);
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int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req);
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int vb2_queue_init(struct vb2_queue *q);
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void vb2_queue_release(struct vb2_queue *q);
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int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b);
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int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking);
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int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type);
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int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type);
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int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma);
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unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait);
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size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count,
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loff_t *ppos, int nonblock);
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size_t vb2_write(struct vb2_queue *q, char __user *data, size_t count,
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loff_t *ppos, int nonblock);
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/**
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* vb2_is_streaming() - return streaming status of the queue
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* @q: videobuf queue
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*/
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static inline bool vb2_is_streaming(struct vb2_queue *q)
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{
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return q->streaming;
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}
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/**
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* vb2_is_busy() - return busy status of the queue
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* @q: videobuf queue
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*
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* This function checks if queue has any buffers allocated.
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*/
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static inline bool vb2_is_busy(struct vb2_queue *q)
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{
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return (q->num_buffers > 0);
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}
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/**
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* vb2_get_drv_priv() - return driver private data associated with the queue
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* @q: videobuf queue
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*/
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static inline void *vb2_get_drv_priv(struct vb2_queue *q)
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{
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return q->drv_priv;
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}
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/**
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* vb2_set_plane_payload() - set bytesused for the plane plane_no
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* @vb: buffer for which plane payload should be set
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* @plane_no: plane number for which payload should be set
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* @size: payload in bytes
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*/
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static inline void vb2_set_plane_payload(struct vb2_buffer *vb,
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unsigned int plane_no, unsigned long size)
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{
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if (plane_no < vb->num_planes)
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vb->v4l2_planes[plane_no].bytesused = size;
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}
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/**
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* vb2_get_plane_payload() - get bytesused for the plane plane_no
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* @vb: buffer for which plane payload should be set
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* @plane_no: plane number for which payload should be set
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* @size: payload in bytes
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*/
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static inline unsigned long vb2_get_plane_payload(struct vb2_buffer *vb,
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unsigned int plane_no)
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{
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if (plane_no < vb->num_planes)
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return vb->v4l2_planes[plane_no].bytesused;
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return 0;
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}
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/**
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* vb2_plane_size() - return plane size in bytes
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* @vb: buffer for which plane size should be returned
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* @plane_no: plane number for which size should be returned
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*/
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static inline unsigned long
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vb2_plane_size(struct vb2_buffer *vb, unsigned int plane_no)
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{
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if (plane_no < vb->num_planes)
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return vb->v4l2_planes[plane_no].length;
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return 0;
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}
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#endif /* _MEDIA_VIDEOBUF2_CORE_H */
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