blob: 9cfd4ee9e56f1eb7dec09704b15a4fabcbb976a4 [file] [log] [blame]
Pawel Osciake23ccc02010-10-11 10:56:41 -03001/*
2 * videobuf2-core.h - V4L2 driver helper framework
3 *
4 * Copyright (C) 2010 Samsung Electronics
5 *
Pawel Osciak95072082011-03-13 15:23:32 -03006 * Author: Pawel Osciak <pawel@osciak.com>
Pawel Osciake23ccc02010-10-11 10:56:41 -03007 *
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.
11 */
12#ifndef _MEDIA_VIDEOBUF2_CORE_H
13#define _MEDIA_VIDEOBUF2_CORE_H
14
15#include <linux/mm_types.h>
16#include <linux/mutex.h>
17#include <linux/poll.h>
18#include <linux/videodev2.h>
Sumit Semwalc5384042012-06-14 10:37:37 -030019#include <linux/dma-buf.h>
Pawel Osciake23ccc02010-10-11 10:56:41 -030020
21struct vb2_alloc_ctx;
Marek Szyprowskib25748f2010-12-06 05:56:55 -030022struct vb2_fileio_data;
Pawel Osciake23ccc02010-10-11 10:56:41 -030023
24/**
25 * struct vb2_mem_ops - memory handling/memory allocator operations
26 * @alloc: allocate video memory and, optionally, allocator private data,
27 * return NULL on failure or a pointer to allocator private,
28 * per-buffer data on success; the returned private structure
29 * will then be passed as buf_priv argument to other ops in this
30 * structure
31 * @put: inform the allocator that the buffer will no longer be used;
32 * usually will result in the allocator freeing the buffer (if
33 * no other users of this buffer are present); the buf_priv
34 * argument is the allocator private per-buffer structure
35 * previously returned from the alloc callback
36 * @get_userptr: acquire userspace memory for a hardware operation; used for
37 * USERPTR memory types; vaddr is the address passed to the
38 * videobuf layer when queuing a video buffer of USERPTR type;
39 * should return an allocator private per-buffer structure
40 * associated with the buffer on success, NULL on failure;
41 * the returned private structure will then be passed as buf_priv
42 * argument to other ops in this structure
43 * @put_userptr: inform the allocator that a USERPTR buffer will no longer
44 * be used
Sumit Semwalc5384042012-06-14 10:37:37 -030045 * @attach_dmabuf: attach a shared struct dma_buf for a hardware operation;
46 * used for DMABUF memory types; alloc_ctx is the alloc context
47 * dbuf is the shared dma_buf; returns NULL on failure;
48 * allocator private per-buffer structure on success;
49 * this needs to be used for further accesses to the buffer
50 * @detach_dmabuf: inform the exporter of the buffer that the current DMABUF
51 * buffer is no longer used; the buf_priv argument is the
52 * allocator private per-buffer structure previously returned
53 * from the attach_dmabuf callback
54 * @map_dmabuf: request for access to the dmabuf from allocator; the allocator
55 * of dmabuf is informed that this driver is going to use the
56 * dmabuf
57 * @unmap_dmabuf: releases access control to the dmabuf - allocator is notified
58 * that this driver is done using the dmabuf for now
Marek Szyprowski3e0c2f22012-06-14 10:37:43 -030059 * @prepare: called every time the buffer is passed from userspace to the
60 * driver, useful for cache synchronisation, optional
61 * @finish: called every time the buffer is passed back from the driver
62 * to the userspace, also optional
Pawel Osciake23ccc02010-10-11 10:56:41 -030063 * @vaddr: return a kernel virtual address to a given memory buffer
64 * associated with the passed private structure or NULL if no
65 * such mapping exists
66 * @cookie: return allocator specific cookie for a given memory buffer
67 * associated with the passed private structure or NULL if not
68 * available
69 * @num_users: return the current number of users of a memory buffer;
70 * return 1 if the videobuf layer (or actually the driver using
71 * it) is the only user
72 * @mmap: setup a userspace mapping for a given memory buffer under
73 * the provided virtual memory region
74 *
75 * Required ops for USERPTR types: get_userptr, put_userptr.
76 * Required ops for MMAP types: alloc, put, num_users, mmap.
Marek Szyprowskib25748f2010-12-06 05:56:55 -030077 * Required ops for read/write access types: alloc, put, num_users, vaddr
Sumit Semwalc5384042012-06-14 10:37:37 -030078 * Required ops for DMABUF types: attach_dmabuf, detach_dmabuf, map_dmabuf,
79 * unmap_dmabuf.
Pawel Osciake23ccc02010-10-11 10:56:41 -030080 */
81struct vb2_mem_ops {
82 void *(*alloc)(void *alloc_ctx, unsigned long size);
83 void (*put)(void *buf_priv);
Tomasz Stanislawski83ae7c52012-06-14 11:32:24 -030084 struct dma_buf *(*get_dmabuf)(void *buf_priv);
Pawel Osciake23ccc02010-10-11 10:56:41 -030085
86 void *(*get_userptr)(void *alloc_ctx, unsigned long vaddr,
87 unsigned long size, int write);
88 void (*put_userptr)(void *buf_priv);
89
Marek Szyprowski3e0c2f22012-06-14 10:37:43 -030090 void (*prepare)(void *buf_priv);
91 void (*finish)(void *buf_priv);
92
Sumit Semwalc5384042012-06-14 10:37:37 -030093 void *(*attach_dmabuf)(void *alloc_ctx, struct dma_buf *dbuf,
94 unsigned long size, int write);
95 void (*detach_dmabuf)(void *buf_priv);
96 int (*map_dmabuf)(void *buf_priv);
97 void (*unmap_dmabuf)(void *buf_priv);
98
Pawel Osciake23ccc02010-10-11 10:56:41 -030099 void *(*vaddr)(void *buf_priv);
100 void *(*cookie)(void *buf_priv);
101
102 unsigned int (*num_users)(void *buf_priv);
103
104 int (*mmap)(void *buf_priv, struct vm_area_struct *vma);
105};
106
107struct vb2_plane {
108 void *mem_priv;
Sumit Semwalc5384042012-06-14 10:37:37 -0300109 struct dma_buf *dbuf;
110 unsigned int dbuf_mapped;
Pawel Osciake23ccc02010-10-11 10:56:41 -0300111};
112
113/**
114 * enum vb2_io_modes - queue access methods
115 * @VB2_MMAP: driver supports MMAP with streaming API
116 * @VB2_USERPTR: driver supports USERPTR with streaming API
117 * @VB2_READ: driver supports read() style access
118 * @VB2_WRITE: driver supports write() style access
Sumit Semwalc5384042012-06-14 10:37:37 -0300119 * @VB2_DMABUF: driver supports DMABUF with streaming API
Pawel Osciake23ccc02010-10-11 10:56:41 -0300120 */
121enum vb2_io_modes {
122 VB2_MMAP = (1 << 0),
123 VB2_USERPTR = (1 << 1),
124 VB2_READ = (1 << 2),
125 VB2_WRITE = (1 << 3),
Sumit Semwalc5384042012-06-14 10:37:37 -0300126 VB2_DMABUF = (1 << 4),
Pawel Osciake23ccc02010-10-11 10:56:41 -0300127};
128
129/**
130 * enum vb2_fileio_flags - flags for selecting a mode of the file io emulator,
131 * by default the 'streaming' style is used by the file io emulator
132 * @VB2_FILEIO_READ_ONCE: report EOF after reading the first buffer
133 * @VB2_FILEIO_WRITE_IMMEDIATELY: queue buffer after each write() call
134 */
135enum vb2_fileio_flags {
136 VB2_FILEIO_READ_ONCE = (1 << 0),
137 VB2_FILEIO_WRITE_IMMEDIATELY = (1 << 1),
138};
139
140/**
141 * enum vb2_buffer_state - current video buffer state
142 * @VB2_BUF_STATE_DEQUEUED: buffer under userspace control
Guennadi Liakhovetskiebc087d2011-08-31 06:51:10 -0300143 * @VB2_BUF_STATE_PREPARED: buffer prepared in videobuf and by the driver
Pawel Osciake23ccc02010-10-11 10:56:41 -0300144 * @VB2_BUF_STATE_QUEUED: buffer queued in videobuf, but not in driver
145 * @VB2_BUF_STATE_ACTIVE: buffer queued in driver and possibly used
146 * in a hardware operation
147 * @VB2_BUF_STATE_DONE: buffer returned from driver to videobuf, but
148 * not yet dequeued to userspace
149 * @VB2_BUF_STATE_ERROR: same as above, but the operation on the buffer
150 * has ended with an error, which will be reported
151 * to the userspace when it is dequeued
152 */
153enum vb2_buffer_state {
154 VB2_BUF_STATE_DEQUEUED,
Guennadi Liakhovetskiebc087d2011-08-31 06:51:10 -0300155 VB2_BUF_STATE_PREPARED,
Pawel Osciake23ccc02010-10-11 10:56:41 -0300156 VB2_BUF_STATE_QUEUED,
157 VB2_BUF_STATE_ACTIVE,
158 VB2_BUF_STATE_DONE,
159 VB2_BUF_STATE_ERROR,
160};
161
162struct vb2_queue;
163
164/**
165 * struct vb2_buffer - represents a video buffer
166 * @v4l2_buf: struct v4l2_buffer associated with this buffer; can
167 * be read by the driver and relevant entries can be
168 * changed by the driver in case of CAPTURE types
169 * (such as timestamp)
170 * @v4l2_planes: struct v4l2_planes associated with this buffer; can
171 * be read by the driver and relevant entries can be
172 * changed by the driver in case of CAPTURE types
173 * (such as bytesused); NOTE that even for single-planar
174 * types, the v4l2_planes[0] struct should be used
175 * instead of v4l2_buf for filling bytesused - drivers
176 * should use the vb2_set_plane_payload() function for that
177 * @vb2_queue: the queue to which this driver belongs
178 * @num_planes: number of planes in the buffer
179 * on an internal driver queue
180 * @state: current buffer state; do not change
181 * @queued_entry: entry on the queued buffers list, which holds all
182 * buffers queued from userspace
183 * @done_entry: entry on the list that stores all buffers ready to
184 * be dequeued to userspace
185 * @planes: private per-plane information; do not change
Pawel Osciake23ccc02010-10-11 10:56:41 -0300186 */
187struct vb2_buffer {
188 struct v4l2_buffer v4l2_buf;
189 struct v4l2_plane v4l2_planes[VIDEO_MAX_PLANES];
190
191 struct vb2_queue *vb2_queue;
192
193 unsigned int num_planes;
194
195/* Private: internal use only */
196 enum vb2_buffer_state state;
197
198 struct list_head queued_entry;
199 struct list_head done_entry;
200
201 struct vb2_plane planes[VIDEO_MAX_PLANES];
Pawel Osciake23ccc02010-10-11 10:56:41 -0300202};
203
204/**
205 * struct vb2_ops - driver-specific callbacks
206 *
Guennadi Liakhovetski2d864012011-09-28 09:23:02 -0300207 * @queue_setup: called from VIDIOC_REQBUFS and VIDIOC_CREATE_BUFS
208 * handlers before memory allocation, or, if
209 * *num_planes != 0, after the allocation to verify a
210 * smaller number of buffers. Driver should return
211 * the required number of buffers in *num_buffers, the
212 * required number of planes per buffer in *num_planes; the
213 * size of each plane should be set in the sizes[] array
214 * and optional per-plane allocator specific context in the
215 * alloc_ctxs[] array. When called from VIDIOC_REQBUFS,
216 * fmt == NULL, the driver has to use the currently
217 * configured format and *num_buffers is the total number
218 * of buffers, that are being allocated. When called from
219 * VIDIOC_CREATE_BUFS, fmt != NULL and it describes the
220 * target frame format. In this case *num_buffers are being
221 * allocated additionally to q->num_buffers.
Pawel Osciake23ccc02010-10-11 10:56:41 -0300222 * @wait_prepare: release any locks taken while calling vb2 functions;
223 * it is called before an ioctl needs to wait for a new
224 * buffer to arrive; required to avoid a deadlock in
225 * blocking access type
226 * @wait_finish: reacquire all locks released in the previous callback;
227 * required to continue operation after sleeping while
228 * waiting for a new buffer to arrive
229 * @buf_init: called once after allocating a buffer (in MMAP case)
230 * or after acquiring a new USERPTR buffer; drivers may
231 * perform additional buffer-related initialization;
232 * initialization failure (return != 0) will prevent
233 * queue setup from completing successfully; optional
Guennadi Liakhovetski2d864012011-09-28 09:23:02 -0300234 * @buf_prepare: called every time the buffer is queued from userspace
235 * and from the VIDIOC_PREPARE_BUF ioctl; drivers may
236 * perform any initialization required before each hardware
237 * operation in this callback; if an error is returned, the
238 * buffer will not be queued in driver; optional
Pawel Osciake23ccc02010-10-11 10:56:41 -0300239 * @buf_finish: called before every dequeue of the buffer back to
240 * userspace; drivers may perform any operations required
241 * before userspace accesses the buffer; optional
242 * @buf_cleanup: called once before the buffer is freed; drivers may
243 * perform any additional cleanup; optional
Marek Szyprowskibd323e22011-08-29 08:51:49 -0300244 * @start_streaming: called once to enter 'streaming' state; the driver may
245 * receive buffers with @buf_queue callback before
246 * @start_streaming is called; the driver gets the number
247 * of already queued buffers in count parameter; driver
248 * can return an error if hardware fails or not enough
249 * buffers has been queued, in such case all buffers that
250 * have been already given by the @buf_queue callback are
251 * invalidated.
Pawel Osciake23ccc02010-10-11 10:56:41 -0300252 * @stop_streaming: called when 'streaming' state must be disabled; driver
253 * should stop any DMA transactions or wait until they
254 * finish and give back all buffers it got from buf_queue()
255 * callback; may use vb2_wait_for_all_buffers() function
256 * @buf_queue: passes buffer vb to the driver; driver may start
257 * hardware operation on this buffer; driver should give
Marek Szyprowskibd323e22011-08-29 08:51:49 -0300258 * the buffer back by calling vb2_buffer_done() function;
259 * it is allways called after calling STREAMON ioctl;
260 * might be called before start_streaming callback if user
261 * pre-queued buffers before calling STREAMON
Pawel Osciake23ccc02010-10-11 10:56:41 -0300262 */
263struct vb2_ops {
Guennadi Liakhovetskifc714e72011-08-24 10:30:21 -0300264 int (*queue_setup)(struct vb2_queue *q, const struct v4l2_format *fmt,
265 unsigned int *num_buffers, unsigned int *num_planes,
266 unsigned int sizes[], void *alloc_ctxs[]);
Pawel Osciake23ccc02010-10-11 10:56:41 -0300267
268 void (*wait_prepare)(struct vb2_queue *q);
269 void (*wait_finish)(struct vb2_queue *q);
270
271 int (*buf_init)(struct vb2_buffer *vb);
272 int (*buf_prepare)(struct vb2_buffer *vb);
273 int (*buf_finish)(struct vb2_buffer *vb);
274 void (*buf_cleanup)(struct vb2_buffer *vb);
275
Marek Szyprowskibd323e22011-08-29 08:51:49 -0300276 int (*start_streaming)(struct vb2_queue *q, unsigned int count);
Pawel Osciake23ccc02010-10-11 10:56:41 -0300277 int (*stop_streaming)(struct vb2_queue *q);
278
279 void (*buf_queue)(struct vb2_buffer *vb);
280};
281
Hans Verkuil5a5adf62012-06-22 07:29:35 -0300282struct v4l2_fh;
283
Pawel Osciake23ccc02010-10-11 10:56:41 -0300284/**
285 * struct vb2_queue - a videobuf queue
286 *
287 * @type: queue type (see V4L2_BUF_TYPE_* in linux/videodev2.h
288 * @io_modes: supported io methods (see vb2_io_modes enum)
289 * @io_flags: additional io flags (see vb2_fileio_flags enum)
Hans Verkuil5a5adf62012-06-22 07:29:35 -0300290 * @lock: pointer to a mutex that protects the vb2_queue struct. The
291 * driver can set this to a mutex to let the v4l2 core serialize
292 * the queuing ioctls. If the driver wants to handle locking
293 * itself, then this should be set to NULL. This lock is not used
294 * by the videobuf2 core API.
295 * @owner: The filehandle that 'owns' the buffers, i.e. the filehandle
296 * that called reqbufs, create_buffers or started fileio.
297 * This field is not used by the videobuf2 core API, but it allows
298 * drivers to easily associate an owner filehandle with the queue.
Pawel Osciake23ccc02010-10-11 10:56:41 -0300299 * @ops: driver-specific callbacks
300 * @mem_ops: memory allocator specific callbacks
301 * @drv_priv: driver private data
302 * @buf_struct_size: size of the driver-specific buffer structure;
303 * "0" indicates the driver doesn't want to use a custom buffer
304 * structure type, so sizeof(struct vb2_buffer) will is used
305 *
306 * @memory: current memory type used
307 * @bufs: videobuf buffer structures
308 * @num_buffers: number of allocated/used buffers
309 * @queued_list: list of buffers currently queued from userspace
310 * @queued_count: number of buffers owned by the driver
311 * @done_list: list of buffers ready to be dequeued to userspace
312 * @done_lock: lock to protect done_list list
313 * @done_wq: waitqueue for processes waiting for buffers ready to be dequeued
314 * @alloc_ctx: memory type/allocator-specific contexts for each plane
315 * @streaming: current streaming state
Marek Szyprowskib25748f2010-12-06 05:56:55 -0300316 * @fileio: file io emulator internal data, used only if emulator is active
Pawel Osciake23ccc02010-10-11 10:56:41 -0300317 */
318struct vb2_queue {
319 enum v4l2_buf_type type;
320 unsigned int io_modes;
321 unsigned int io_flags;
Hans Verkuil5a5adf62012-06-22 07:29:35 -0300322 struct mutex *lock;
323 struct v4l2_fh *owner;
Pawel Osciake23ccc02010-10-11 10:56:41 -0300324
325 const struct vb2_ops *ops;
326 const struct vb2_mem_ops *mem_ops;
327 void *drv_priv;
328 unsigned int buf_struct_size;
329
330/* private: internal use only */
331 enum v4l2_memory memory;
332 struct vb2_buffer *bufs[VIDEO_MAX_FRAME];
333 unsigned int num_buffers;
334
335 struct list_head queued_list;
336
337 atomic_t queued_count;
338 struct list_head done_list;
339 spinlock_t done_lock;
340 wait_queue_head_t done_wq;
341
342 void *alloc_ctx[VIDEO_MAX_PLANES];
Marek Szyprowski035aa142011-08-24 06:43:36 -0300343 unsigned int plane_sizes[VIDEO_MAX_PLANES];
Pawel Osciake23ccc02010-10-11 10:56:41 -0300344
345 unsigned int streaming:1;
Marek Szyprowskib25748f2010-12-06 05:56:55 -0300346
347 struct vb2_fileio_data *fileio;
Pawel Osciake23ccc02010-10-11 10:56:41 -0300348};
349
350void *vb2_plane_vaddr(struct vb2_buffer *vb, unsigned int plane_no);
351void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no);
352
353void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state);
354int vb2_wait_for_all_buffers(struct vb2_queue *q);
355
356int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b);
357int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req);
358
Guennadi Liakhovetski2d864012011-09-28 09:23:02 -0300359int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create);
360int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b);
361
Ezequiel Garcia896f38f2012-09-17 14:59:30 -0300362int __must_check vb2_queue_init(struct vb2_queue *q);
Pawel Osciake23ccc02010-10-11 10:56:41 -0300363
364void vb2_queue_release(struct vb2_queue *q);
365
366int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b);
Tomasz Stanislawski83ae7c52012-06-14 11:32:24 -0300367int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb);
Pawel Osciake23ccc02010-10-11 10:56:41 -0300368int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking);
369
370int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type);
371int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type);
372
373int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma);
Scott Jiang6f524ec2011-09-21 09:25:23 -0300374#ifndef CONFIG_MMU
375unsigned long vb2_get_unmapped_area(struct vb2_queue *q,
376 unsigned long addr,
377 unsigned long len,
378 unsigned long pgoff,
379 unsigned long flags);
380#endif
Pawel Osciake23ccc02010-10-11 10:56:41 -0300381unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait);
Marek Szyprowskib25748f2010-12-06 05:56:55 -0300382size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count,
383 loff_t *ppos, int nonblock);
384size_t vb2_write(struct vb2_queue *q, char __user *data, size_t count,
385 loff_t *ppos, int nonblock);
Pawel Osciake23ccc02010-10-11 10:56:41 -0300386
387/**
388 * vb2_is_streaming() - return streaming status of the queue
389 * @q: videobuf queue
390 */
391static inline bool vb2_is_streaming(struct vb2_queue *q)
392{
393 return q->streaming;
394}
395
396/**
397 * vb2_is_busy() - return busy status of the queue
398 * @q: videobuf queue
399 *
400 * This function checks if queue has any buffers allocated.
401 */
402static inline bool vb2_is_busy(struct vb2_queue *q)
403{
404 return (q->num_buffers > 0);
405}
406
407/**
408 * vb2_get_drv_priv() - return driver private data associated with the queue
409 * @q: videobuf queue
410 */
411static inline void *vb2_get_drv_priv(struct vb2_queue *q)
412{
413 return q->drv_priv;
414}
415
416/**
417 * vb2_set_plane_payload() - set bytesused for the plane plane_no
418 * @vb: buffer for which plane payload should be set
419 * @plane_no: plane number for which payload should be set
420 * @size: payload in bytes
421 */
422static inline void vb2_set_plane_payload(struct vb2_buffer *vb,
423 unsigned int plane_no, unsigned long size)
424{
425 if (plane_no < vb->num_planes)
426 vb->v4l2_planes[plane_no].bytesused = size;
427}
428
429/**
Laurent Pinchart9f00eda2011-02-27 14:38:19 -0300430 * vb2_get_plane_payload() - get bytesused for the plane plane_no
Pawel Osciake23ccc02010-10-11 10:56:41 -0300431 * @vb: buffer for which plane payload should be set
432 * @plane_no: plane number for which payload should be set
433 * @size: payload in bytes
434 */
435static inline unsigned long vb2_get_plane_payload(struct vb2_buffer *vb,
436 unsigned int plane_no)
437{
438 if (plane_no < vb->num_planes)
439 return vb->v4l2_planes[plane_no].bytesused;
440 return 0;
441}
442
443/**
444 * vb2_plane_size() - return plane size in bytes
445 * @vb: buffer for which plane size should be returned
446 * @plane_no: plane number for which size should be returned
447 */
448static inline unsigned long
449vb2_plane_size(struct vb2_buffer *vb, unsigned int plane_no)
450{
451 if (plane_no < vb->num_planes)
452 return vb->v4l2_planes[plane_no].length;
453 return 0;
454}
455
Hans Verkuil4c1ffca2012-07-02 05:59:18 -0300456/*
457 * The following functions are not part of the vb2 core API, but are simple
458 * helper functions that you can use in your struct v4l2_file_operations,
459 * struct v4l2_ioctl_ops and struct vb2_ops. They will serialize if vb2_queue->lock
460 * or video_device->lock is set, and they will set and test vb2_queue->owner
461 * to check if the calling filehandle is permitted to do the queuing operation.
462 */
463
464/* struct v4l2_ioctl_ops helpers */
465
466int vb2_ioctl_reqbufs(struct file *file, void *priv,
467 struct v4l2_requestbuffers *p);
468int vb2_ioctl_create_bufs(struct file *file, void *priv,
469 struct v4l2_create_buffers *p);
470int vb2_ioctl_prepare_buf(struct file *file, void *priv,
471 struct v4l2_buffer *p);
472int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p);
473int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p);
474int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p);
475int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i);
476int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i);
Tomasz Stanislawski83ae7c52012-06-14 11:32:24 -0300477int vb2_ioctl_expbuf(struct file *file, void *priv,
478 struct v4l2_exportbuffer *p);
Hans Verkuil4c1ffca2012-07-02 05:59:18 -0300479
480/* struct v4l2_file_operations helpers */
481
482int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma);
483int vb2_fop_release(struct file *file);
484ssize_t vb2_fop_write(struct file *file, char __user *buf,
485 size_t count, loff_t *ppos);
486ssize_t vb2_fop_read(struct file *file, char __user *buf,
487 size_t count, loff_t *ppos);
488unsigned int vb2_fop_poll(struct file *file, poll_table *wait);
489#ifndef CONFIG_MMU
490unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr,
491 unsigned long len, unsigned long pgoff, unsigned long flags);
492#endif
493
494/* struct vb2_ops helpers, only use if vq->lock is non-NULL. */
495
496void vb2_ops_wait_prepare(struct vb2_queue *vq);
497void vb2_ops_wait_finish(struct vb2_queue *vq);
498
Pawel Osciake23ccc02010-10-11 10:56:41 -0300499#endif /* _MEDIA_VIDEOBUF2_CORE_H */