2 * videobuf2-core.h - V4L2 driver helper framework
4 * Copyright (C) 2010 Samsung Electronics
6 * Author: Pawel Osciak <pawel@osciak.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation.
12 #ifndef _MEDIA_VIDEOBUF2_CORE_H
13 #define _MEDIA_VIDEOBUF2_CORE_H
15 #include <linux/mm_types.h>
16 #include <linux/mutex.h>
17 #include <linux/poll.h>
18 #include <linux/videodev2.h>
19 #include <linux/dma-buf.h>
22 struct vb2_fileio_data
;
23 struct vb2_threadio_data
;
26 * struct vb2_mem_ops - memory handling/memory allocator operations
27 * @alloc: allocate video memory and, optionally, allocator private data,
28 * return NULL on failure or a pointer to allocator private,
29 * per-buffer data on success; the returned private structure
30 * will then be passed as buf_priv argument to other ops in this
31 * structure. Additional gfp_flags to use when allocating the
32 * are also passed to this operation. These flags are from the
33 * gfp_flags field of vb2_queue.
34 * @put: inform the allocator that the buffer will no longer be used;
35 * usually will result in the allocator freeing the buffer (if
36 * no other users of this buffer are present); the buf_priv
37 * argument is the allocator private per-buffer structure
38 * previously returned from the alloc callback.
39 * @get_userptr: acquire userspace memory for a hardware operation; used for
40 * USERPTR memory types; vaddr is the address passed to the
41 * videobuf layer when queuing a video buffer of USERPTR type;
42 * should return an allocator private per-buffer structure
43 * associated with the buffer on success, NULL on failure;
44 * the returned private structure will then be passed as buf_priv
45 * argument to other ops in this structure.
46 * @put_userptr: inform the allocator that a USERPTR buffer will no longer
48 * @attach_dmabuf: attach a shared struct dma_buf for a hardware operation;
49 * used for DMABUF memory types; alloc_ctx is the alloc context
50 * dbuf is the shared dma_buf; returns NULL on failure;
51 * allocator private per-buffer structure on success;
52 * this needs to be used for further accesses to the buffer.
53 * @detach_dmabuf: inform the exporter of the buffer that the current DMABUF
54 * buffer is no longer used; the buf_priv argument is the
55 * allocator private per-buffer structure previously returned
56 * from the attach_dmabuf callback.
57 * @map_dmabuf: request for access to the dmabuf from allocator; the allocator
58 * of dmabuf is informed that this driver is going to use the
60 * @unmap_dmabuf: releases access control to the dmabuf - allocator is notified
61 * that this driver is done using the dmabuf for now.
62 * @prepare: called every time the buffer is passed from userspace to the
63 * driver, useful for cache synchronisation, optional.
64 * @finish: called every time the buffer is passed back from the driver
65 * to the userspace, also optional.
66 * @vaddr: return a kernel virtual address to a given memory buffer
67 * associated with the passed private structure or NULL if no
68 * such mapping exists.
69 * @cookie: return allocator specific cookie for a given memory buffer
70 * associated with the passed private structure or NULL if not
72 * @num_users: return the current number of users of a memory buffer;
73 * return 1 if the videobuf layer (or actually the driver using
74 * it) is the only user.
75 * @mmap: setup a userspace mapping for a given memory buffer under
76 * the provided virtual memory region.
78 * Required ops for USERPTR types: get_userptr, put_userptr.
79 * Required ops for MMAP types: alloc, put, num_users, mmap.
80 * Required ops for read/write access types: alloc, put, num_users, vaddr.
81 * Required ops for DMABUF types: attach_dmabuf, detach_dmabuf, map_dmabuf,
85 void *(*alloc
)(void *alloc_ctx
, unsigned long size
,
86 enum dma_data_direction dma_dir
,
88 void (*put
)(void *buf_priv
);
89 struct dma_buf
*(*get_dmabuf
)(void *buf_priv
, unsigned long flags
);
91 void *(*get_userptr
)(void *alloc_ctx
, unsigned long vaddr
,
93 enum dma_data_direction dma_dir
);
94 void (*put_userptr
)(void *buf_priv
);
96 void (*prepare
)(void *buf_priv
);
97 void (*finish
)(void *buf_priv
);
99 void *(*attach_dmabuf
)(void *alloc_ctx
, struct dma_buf
*dbuf
,
101 enum dma_data_direction dma_dir
);
102 void (*detach_dmabuf
)(void *buf_priv
);
103 int (*map_dmabuf
)(void *buf_priv
);
104 void (*unmap_dmabuf
)(void *buf_priv
);
106 void *(*vaddr
)(void *buf_priv
);
107 void *(*cookie
)(void *buf_priv
);
109 unsigned int (*num_users
)(void *buf_priv
);
111 int (*mmap
)(void *buf_priv
, struct vm_area_struct
*vma
);
116 struct dma_buf
*dbuf
;
117 unsigned int dbuf_mapped
;
121 * enum vb2_io_modes - queue access methods
122 * @VB2_MMAP: driver supports MMAP with streaming API
123 * @VB2_USERPTR: driver supports USERPTR with streaming API
124 * @VB2_READ: driver supports read() style access
125 * @VB2_WRITE: driver supports write() style access
126 * @VB2_DMABUF: driver supports DMABUF with streaming API
130 VB2_USERPTR
= (1 << 1),
132 VB2_WRITE
= (1 << 3),
133 VB2_DMABUF
= (1 << 4),
137 * enum vb2_fileio_flags - flags for selecting a mode of the file io emulator,
138 * by default the 'streaming' style is used by the file io emulator
139 * @VB2_FILEIO_READ_ONCE: report EOF after reading the first buffer
140 * @VB2_FILEIO_WRITE_IMMEDIATELY: queue buffer after each write() call
142 enum vb2_fileio_flags
{
143 VB2_FILEIO_READ_ONCE
= (1 << 0),
144 VB2_FILEIO_WRITE_IMMEDIATELY
= (1 << 1),
148 * enum vb2_buffer_state - current video buffer state
149 * @VB2_BUF_STATE_DEQUEUED: buffer under userspace control
150 * @VB2_BUF_STATE_PREPARING: buffer is being prepared in videobuf
151 * @VB2_BUF_STATE_PREPARED: buffer prepared in videobuf and by the driver
152 * @VB2_BUF_STATE_QUEUED: buffer queued in videobuf, but not in driver
153 * @VB2_BUF_STATE_ACTIVE: buffer queued in driver and possibly used
154 * in a hardware operation
155 * @VB2_BUF_STATE_DONE: buffer returned from driver to videobuf, but
156 * not yet dequeued to userspace
157 * @VB2_BUF_STATE_ERROR: same as above, but the operation on the buffer
158 * has ended with an error, which will be reported
159 * to the userspace when it is dequeued
161 enum vb2_buffer_state
{
162 VB2_BUF_STATE_DEQUEUED
,
163 VB2_BUF_STATE_PREPARING
,
164 VB2_BUF_STATE_PREPARED
,
165 VB2_BUF_STATE_QUEUED
,
166 VB2_BUF_STATE_ACTIVE
,
174 * struct vb2_buffer - represents a video buffer
175 * @v4l2_buf: struct v4l2_buffer associated with this buffer; can
176 * be read by the driver and relevant entries can be
177 * changed by the driver in case of CAPTURE types
178 * (such as timestamp)
179 * @v4l2_planes: struct v4l2_planes associated with this buffer; can
180 * be read by the driver and relevant entries can be
181 * changed by the driver in case of CAPTURE types
182 * (such as bytesused); NOTE that even for single-planar
183 * types, the v4l2_planes[0] struct should be used
184 * instead of v4l2_buf for filling bytesused - drivers
185 * should use the vb2_set_plane_payload() function for that
186 * @vb2_queue: the queue to which this driver belongs
187 * @num_planes: number of planes in the buffer
188 * on an internal driver queue
189 * @state: current buffer state; do not change
190 * @queued_entry: entry on the queued buffers list, which holds all
191 * buffers queued from userspace
192 * @done_entry: entry on the list that stores all buffers ready to
193 * be dequeued to userspace
194 * @planes: private per-plane information; do not change
197 struct v4l2_buffer v4l2_buf
;
198 struct v4l2_plane v4l2_planes
[VIDEO_MAX_PLANES
];
200 struct vb2_queue
*vb2_queue
;
202 unsigned int num_planes
;
204 /* Private: internal use only */
205 enum vb2_buffer_state state
;
207 struct list_head queued_entry
;
208 struct list_head done_entry
;
210 struct vb2_plane planes
[VIDEO_MAX_PLANES
];
212 #ifdef CONFIG_VIDEO_ADV_DEBUG
214 * Counters for how often these buffer-related ops are
215 * called. Used to check for unbalanced ops.
219 u32 cnt_mem_get_dmabuf
;
220 u32 cnt_mem_get_userptr
;
221 u32 cnt_mem_put_userptr
;
224 u32 cnt_mem_attach_dmabuf
;
225 u32 cnt_mem_detach_dmabuf
;
226 u32 cnt_mem_map_dmabuf
;
227 u32 cnt_mem_unmap_dmabuf
;
230 u32 cnt_mem_num_users
;
239 /* This counts the number of calls to vb2_buffer_done() */
245 * struct vb2_ops - driver-specific callbacks
247 * @queue_setup: called from VIDIOC_REQBUFS and VIDIOC_CREATE_BUFS
248 * handlers before memory allocation, or, if
249 * *num_planes != 0, after the allocation to verify a
250 * smaller number of buffers. Driver should return
251 * the required number of buffers in *num_buffers, the
252 * required number of planes per buffer in *num_planes; the
253 * size of each plane should be set in the sizes[] array
254 * and optional per-plane allocator specific context in the
255 * alloc_ctxs[] array. When called from VIDIOC_REQBUFS,
256 * fmt == NULL, the driver has to use the currently
257 * configured format and *num_buffers is the total number
258 * of buffers, that are being allocated. When called from
259 * VIDIOC_CREATE_BUFS, fmt != NULL and it describes the
260 * target frame format (if the format isn't valid the
261 * callback must return -EINVAL). In this case *num_buffers
262 * are being allocated additionally to q->num_buffers.
263 * @wait_prepare: release any locks taken while calling vb2 functions;
264 * it is called before an ioctl needs to wait for a new
265 * buffer to arrive; required to avoid a deadlock in
266 * blocking access type.
267 * @wait_finish: reacquire all locks released in the previous callback;
268 * required to continue operation after sleeping while
269 * waiting for a new buffer to arrive.
270 * @buf_init: called once after allocating a buffer (in MMAP case)
271 * or after acquiring a new USERPTR buffer; drivers may
272 * perform additional buffer-related initialization;
273 * initialization failure (return != 0) will prevent
274 * queue setup from completing successfully; optional.
275 * @buf_prepare: called every time the buffer is queued from userspace
276 * and from the VIDIOC_PREPARE_BUF ioctl; drivers may
277 * perform any initialization required before each
278 * hardware operation in this callback; drivers can
279 * access/modify the buffer here as it is still synced for
280 * the CPU; drivers that support VIDIOC_CREATE_BUFS must
281 * also validate the buffer size; if an error is returned,
282 * the buffer will not be queued in driver; optional.
283 * @buf_finish: called before every dequeue of the buffer back to
284 * userspace; the buffer is synced for the CPU, so drivers
285 * can access/modify the buffer contents; drivers may
286 * perform any operations required before userspace
287 * accesses the buffer; optional. The buffer state can be
288 * one of the following: DONE and ERROR occur while
289 * streaming is in progress, and the PREPARED state occurs
290 * when the queue has been canceled and all pending
291 * buffers are being returned to their default DEQUEUED
292 * state. Typically you only have to do something if the
293 * state is VB2_BUF_STATE_DONE, since in all other cases
294 * the buffer contents will be ignored anyway.
295 * @buf_cleanup: called once before the buffer is freed; drivers may
296 * perform any additional cleanup; optional.
297 * @start_streaming: called once to enter 'streaming' state; the driver may
298 * receive buffers with @buf_queue callback before
299 * @start_streaming is called; the driver gets the number
300 * of already queued buffers in count parameter; driver
301 * can return an error if hardware fails, in that case all
302 * buffers that have been already given by the @buf_queue
303 * callback are to be returned by the driver by calling
304 * @vb2_buffer_done(VB2_BUF_STATE_QUEUED).
305 * If you need a minimum number of buffers before you can
306 * start streaming, then set @min_buffers_needed in the
307 * vb2_queue structure. If that is non-zero then
308 * start_streaming won't be called until at least that
309 * many buffers have been queued up by userspace.
310 * @stop_streaming: called when 'streaming' state must be disabled; driver
311 * should stop any DMA transactions or wait until they
312 * finish and give back all buffers it got from buf_queue()
313 * callback by calling @vb2_buffer_done() with either
314 * VB2_BUF_STATE_DONE or VB2_BUF_STATE_ERROR; may use
315 * vb2_wait_for_all_buffers() function
316 * @buf_queue: passes buffer vb to the driver; driver may start
317 * hardware operation on this buffer; driver should give
318 * the buffer back by calling vb2_buffer_done() function;
319 * it is allways called after calling STREAMON ioctl;
320 * might be called before start_streaming callback if user
321 * pre-queued buffers before calling STREAMON.
324 int (*queue_setup
)(struct vb2_queue
*q
, const struct v4l2_format
*fmt
,
325 unsigned int *num_buffers
, unsigned int *num_planes
,
326 unsigned int sizes
[], void *alloc_ctxs
[]);
328 void (*wait_prepare
)(struct vb2_queue
*q
);
329 void (*wait_finish
)(struct vb2_queue
*q
);
331 int (*buf_init
)(struct vb2_buffer
*vb
);
332 int (*buf_prepare
)(struct vb2_buffer
*vb
);
333 void (*buf_finish
)(struct vb2_buffer
*vb
);
334 void (*buf_cleanup
)(struct vb2_buffer
*vb
);
336 int (*start_streaming
)(struct vb2_queue
*q
, unsigned int count
);
337 void (*stop_streaming
)(struct vb2_queue
*q
);
339 void (*buf_queue
)(struct vb2_buffer
*vb
);
345 * struct vb2_queue - a videobuf queue
347 * @type: queue type (see V4L2_BUF_TYPE_* in linux/videodev2.h
348 * @io_modes: supported io methods (see vb2_io_modes enum)
349 * @io_flags: additional io flags (see vb2_fileio_flags enum)
350 * @lock: pointer to a mutex that protects the vb2_queue struct. The
351 * driver can set this to a mutex to let the v4l2 core serialize
352 * the queuing ioctls. If the driver wants to handle locking
353 * itself, then this should be set to NULL. This lock is not used
354 * by the videobuf2 core API.
355 * @owner: The filehandle that 'owns' the buffers, i.e. the filehandle
356 * that called reqbufs, create_buffers or started fileio.
357 * This field is not used by the videobuf2 core API, but it allows
358 * drivers to easily associate an owner filehandle with the queue.
359 * @ops: driver-specific callbacks
360 * @mem_ops: memory allocator specific callbacks
361 * @drv_priv: driver private data
362 * @buf_struct_size: size of the driver-specific buffer structure;
363 * "0" indicates the driver doesn't want to use a custom buffer
364 * structure type, so sizeof(struct vb2_buffer) will is used
365 * @timestamp_flags: Timestamp flags; V4L2_BUF_FLAG_TIMESTAMP_* and
366 * V4L2_BUF_FLAG_TSTAMP_SRC_*
367 * @gfp_flags: additional gfp flags used when allocating the buffers.
368 * Typically this is 0, but it may be e.g. GFP_DMA or __GFP_DMA32
369 * to force the buffer allocation to a specific memory zone.
370 * @min_buffers_needed: the minimum number of buffers needed before
371 * start_streaming() can be called. Used when a DMA engine
372 * cannot be started unless at least this number of buffers
373 * have been queued into the driver.
375 * @mmap_lock: private mutex used when buffers are allocated/freed/mmapped
376 * @memory: current memory type used
377 * @bufs: videobuf buffer structures
378 * @num_buffers: number of allocated/used buffers
379 * @queued_list: list of buffers currently queued from userspace
380 * @queued_count: number of buffers queued and ready for streaming.
381 * @owned_by_drv_count: number of buffers owned by the driver
382 * @done_list: list of buffers ready to be dequeued to userspace
383 * @done_lock: lock to protect done_list list
384 * @done_wq: waitqueue for processes waiting for buffers ready to be dequeued
385 * @alloc_ctx: memory type/allocator-specific contexts for each plane
386 * @streaming: current streaming state
387 * @start_streaming_called: start_streaming() was called successfully and we
389 * @error: a fatal error occurred on the queue
390 * @waiting_for_buffers: used in poll() to check if vb2 is still waiting for
391 * buffers. Only set for capture queues if qbuf has not yet been
392 * called since poll() needs to return POLLERR in that situation.
393 * @fileio: file io emulator internal data, used only if emulator is active
394 * @threadio: thread io internal data, used only if thread is active
397 enum v4l2_buf_type type
;
398 unsigned int io_modes
;
399 unsigned int io_flags
;
401 struct v4l2_fh
*owner
;
403 const struct vb2_ops
*ops
;
404 const struct vb2_mem_ops
*mem_ops
;
406 unsigned int buf_struct_size
;
409 u32 min_buffers_needed
;
411 /* private: internal use only */
412 struct mutex mmap_lock
;
413 enum v4l2_memory memory
;
414 struct vb2_buffer
*bufs
[VIDEO_MAX_FRAME
];
415 unsigned int num_buffers
;
417 struct list_head queued_list
;
418 unsigned int queued_count
;
420 atomic_t owned_by_drv_count
;
421 struct list_head done_list
;
422 spinlock_t done_lock
;
423 wait_queue_head_t done_wq
;
425 void *alloc_ctx
[VIDEO_MAX_PLANES
];
426 unsigned int plane_sizes
[VIDEO_MAX_PLANES
];
428 unsigned int streaming
:1;
429 unsigned int start_streaming_called
:1;
430 unsigned int error
:1;
431 unsigned int waiting_for_buffers
:1;
433 struct vb2_fileio_data
*fileio
;
434 struct vb2_threadio_data
*threadio
;
436 #ifdef CONFIG_VIDEO_ADV_DEBUG
438 * Counters for how often these queue-related ops are
439 * called. Used to check for unbalanced ops.
442 u32 cnt_wait_prepare
;
444 u32 cnt_start_streaming
;
445 u32 cnt_stop_streaming
;
449 void *vb2_plane_vaddr(struct vb2_buffer
*vb
, unsigned int plane_no
);
450 void *vb2_plane_cookie(struct vb2_buffer
*vb
, unsigned int plane_no
);
452 void vb2_buffer_done(struct vb2_buffer
*vb
, enum vb2_buffer_state state
);
453 void vb2_discard_done(struct vb2_queue
*q
);
454 int vb2_wait_for_all_buffers(struct vb2_queue
*q
);
456 int vb2_querybuf(struct vb2_queue
*q
, struct v4l2_buffer
*b
);
457 int vb2_reqbufs(struct vb2_queue
*q
, struct v4l2_requestbuffers
*req
);
459 int vb2_create_bufs(struct vb2_queue
*q
, struct v4l2_create_buffers
*create
);
460 int vb2_prepare_buf(struct vb2_queue
*q
, struct v4l2_buffer
*b
);
462 int __must_check
vb2_queue_init(struct vb2_queue
*q
);
464 void vb2_queue_release(struct vb2_queue
*q
);
465 void vb2_queue_error(struct vb2_queue
*q
);
467 int vb2_qbuf(struct vb2_queue
*q
, struct v4l2_buffer
*b
);
468 int vb2_expbuf(struct vb2_queue
*q
, struct v4l2_exportbuffer
*eb
);
469 int vb2_dqbuf(struct vb2_queue
*q
, struct v4l2_buffer
*b
, bool nonblocking
);
471 int vb2_streamon(struct vb2_queue
*q
, enum v4l2_buf_type type
);
472 int vb2_streamoff(struct vb2_queue
*q
, enum v4l2_buf_type type
);
474 int vb2_mmap(struct vb2_queue
*q
, struct vm_area_struct
*vma
);
476 unsigned long vb2_get_unmapped_area(struct vb2_queue
*q
,
480 unsigned long flags
);
482 unsigned int vb2_poll(struct vb2_queue
*q
, struct file
*file
, poll_table
*wait
);
483 size_t vb2_read(struct vb2_queue
*q
, char __user
*data
, size_t count
,
484 loff_t
*ppos
, int nonblock
);
485 size_t vb2_write(struct vb2_queue
*q
, const char __user
*data
, size_t count
,
486 loff_t
*ppos
, int nonblock
);
488 * vb2_thread_fnc - callback function for use with vb2_thread
490 * This is called whenever a buffer is dequeued in the thread.
492 typedef int (*vb2_thread_fnc
)(struct vb2_buffer
*vb
, void *priv
);
495 * vb2_thread_start() - start a thread for the given queue.
497 * @fnc: callback function
498 * @priv: priv pointer passed to the callback function
499 * @thread_name:the name of the thread. This will be prefixed with "vb2-".
501 * This starts a thread that will queue and dequeue until an error occurs
502 * or @vb2_thread_stop is called.
504 * This function should not be used for anything else but the videobuf2-dvb
505 * support. If you think you have another good use-case for this, then please
506 * contact the linux-media mailinglist first.
508 int vb2_thread_start(struct vb2_queue
*q
, vb2_thread_fnc fnc
, void *priv
,
509 const char *thread_name
);
512 * vb2_thread_stop() - stop the thread for the given queue.
515 int vb2_thread_stop(struct vb2_queue
*q
);
518 * vb2_is_streaming() - return streaming status of the queue
521 static inline bool vb2_is_streaming(struct vb2_queue
*q
)
527 * vb2_fileio_is_active() - return true if fileio is active.
530 * This returns true if read() or write() is used to stream the data
531 * as opposed to stream I/O. This is almost never an important distinction,
532 * except in rare cases. One such case is that using read() or write() to
533 * stream a format using V4L2_FIELD_ALTERNATE is not allowed since there
534 * is no way you can pass the field information of each buffer to/from
535 * userspace. A driver that supports this field format should check for
536 * this in the queue_setup op and reject it if this function returns true.
538 static inline bool vb2_fileio_is_active(struct vb2_queue
*q
)
544 * vb2_is_busy() - return busy status of the queue
547 * This function checks if queue has any buffers allocated.
549 static inline bool vb2_is_busy(struct vb2_queue
*q
)
551 return (q
->num_buffers
> 0);
555 * vb2_get_drv_priv() - return driver private data associated with the queue
558 static inline void *vb2_get_drv_priv(struct vb2_queue
*q
)
564 * vb2_set_plane_payload() - set bytesused for the plane plane_no
565 * @vb: buffer for which plane payload should be set
566 * @plane_no: plane number for which payload should be set
567 * @size: payload in bytes
569 static inline void vb2_set_plane_payload(struct vb2_buffer
*vb
,
570 unsigned int plane_no
, unsigned long size
)
572 if (plane_no
< vb
->num_planes
)
573 vb
->v4l2_planes
[plane_no
].bytesused
= size
;
577 * vb2_get_plane_payload() - get bytesused for the plane plane_no
578 * @vb: buffer for which plane payload should be set
579 * @plane_no: plane number for which payload should be set
580 * @size: payload in bytes
582 static inline unsigned long vb2_get_plane_payload(struct vb2_buffer
*vb
,
583 unsigned int plane_no
)
585 if (plane_no
< vb
->num_planes
)
586 return vb
->v4l2_planes
[plane_no
].bytesused
;
591 * vb2_plane_size() - return plane size in bytes
592 * @vb: buffer for which plane size should be returned
593 * @plane_no: plane number for which size should be returned
595 static inline unsigned long
596 vb2_plane_size(struct vb2_buffer
*vb
, unsigned int plane_no
)
598 if (plane_no
< vb
->num_planes
)
599 return vb
->v4l2_planes
[plane_no
].length
;
604 * vb2_start_streaming_called() - return streaming status of driver
607 static inline bool vb2_start_streaming_called(struct vb2_queue
*q
)
609 return q
->start_streaming_called
;
613 * The following functions are not part of the vb2 core API, but are simple
614 * helper functions that you can use in your struct v4l2_file_operations,
615 * struct v4l2_ioctl_ops and struct vb2_ops. They will serialize if vb2_queue->lock
616 * or video_device->lock is set, and they will set and test vb2_queue->owner
617 * to check if the calling filehandle is permitted to do the queuing operation.
620 /* struct v4l2_ioctl_ops helpers */
622 int vb2_ioctl_reqbufs(struct file
*file
, void *priv
,
623 struct v4l2_requestbuffers
*p
);
624 int vb2_ioctl_create_bufs(struct file
*file
, void *priv
,
625 struct v4l2_create_buffers
*p
);
626 int vb2_ioctl_prepare_buf(struct file
*file
, void *priv
,
627 struct v4l2_buffer
*p
);
628 int vb2_ioctl_querybuf(struct file
*file
, void *priv
, struct v4l2_buffer
*p
);
629 int vb2_ioctl_qbuf(struct file
*file
, void *priv
, struct v4l2_buffer
*p
);
630 int vb2_ioctl_dqbuf(struct file
*file
, void *priv
, struct v4l2_buffer
*p
);
631 int vb2_ioctl_streamon(struct file
*file
, void *priv
, enum v4l2_buf_type i
);
632 int vb2_ioctl_streamoff(struct file
*file
, void *priv
, enum v4l2_buf_type i
);
633 int vb2_ioctl_expbuf(struct file
*file
, void *priv
,
634 struct v4l2_exportbuffer
*p
);
636 /* struct v4l2_file_operations helpers */
638 int vb2_fop_mmap(struct file
*file
, struct vm_area_struct
*vma
);
639 int vb2_fop_release(struct file
*file
);
640 int _vb2_fop_release(struct file
*file
, struct mutex
*lock
);
641 ssize_t
vb2_fop_write(struct file
*file
, const char __user
*buf
,
642 size_t count
, loff_t
*ppos
);
643 ssize_t
vb2_fop_read(struct file
*file
, char __user
*buf
,
644 size_t count
, loff_t
*ppos
);
645 unsigned int vb2_fop_poll(struct file
*file
, poll_table
*wait
);
647 unsigned long vb2_fop_get_unmapped_area(struct file
*file
, unsigned long addr
,
648 unsigned long len
, unsigned long pgoff
, unsigned long flags
);
651 /* struct vb2_ops helpers, only use if vq->lock is non-NULL. */
653 void vb2_ops_wait_prepare(struct vb2_queue
*vq
);
654 void vb2_ops_wait_finish(struct vb2_queue
*vq
);
656 #endif /* _MEDIA_VIDEOBUF2_CORE_H */