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e23ccc0a PO |
1 | /* |
2 | * videobuf2-core.h - V4L2 driver helper framework | |
3 | * | |
4 | * Copyright (C) 2010 Samsung Electronics | |
5 | * | |
95072084 | 6 | * Author: Pawel Osciak <pawel@osciak.com> |
e23ccc0a PO |
7 | * |
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> | |
c5384048 | 19 | #include <linux/dma-buf.h> |
e23ccc0a PO |
20 | |
21 | struct vb2_alloc_ctx; | |
b25748fe | 22 | struct vb2_fileio_data; |
e23ccc0a PO |
23 | |
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 | |
b6ba2057 HV |
30 | * structure. Additional gfp_flags to use when allocating the |
31 | * are also passed to this operation. These flags are from the | |
32 | * gfp_flags field of vb2_queue. | |
e23ccc0a PO |
33 | * @put: inform the allocator that the buffer will no longer be used; |
34 | * usually will result in the allocator freeing the buffer (if | |
35 | * no other users of this buffer are present); the buf_priv | |
36 | * argument is the allocator private per-buffer structure | |
37 | * previously returned from the alloc callback | |
38 | * @get_userptr: acquire userspace memory for a hardware operation; used for | |
39 | * USERPTR memory types; vaddr is the address passed to the | |
40 | * videobuf layer when queuing a video buffer of USERPTR type; | |
41 | * should return an allocator private per-buffer structure | |
42 | * associated with the buffer on success, NULL on failure; | |
43 | * the returned private structure will then be passed as buf_priv | |
44 | * argument to other ops in this structure | |
45 | * @put_userptr: inform the allocator that a USERPTR buffer will no longer | |
46 | * be used | |
c5384048 SS |
47 | * @attach_dmabuf: attach a shared struct dma_buf for a hardware operation; |
48 | * used for DMABUF memory types; alloc_ctx is the alloc context | |
49 | * dbuf is the shared dma_buf; returns NULL on failure; | |
50 | * allocator private per-buffer structure on success; | |
51 | * this needs to be used for further accesses to the buffer | |
52 | * @detach_dmabuf: inform the exporter of the buffer that the current DMABUF | |
53 | * buffer is no longer used; the buf_priv argument is the | |
54 | * allocator private per-buffer structure previously returned | |
55 | * from the attach_dmabuf callback | |
56 | * @map_dmabuf: request for access to the dmabuf from allocator; the allocator | |
57 | * of dmabuf is informed that this driver is going to use the | |
58 | * dmabuf | |
59 | * @unmap_dmabuf: releases access control to the dmabuf - allocator is notified | |
60 | * that this driver is done using the dmabuf for now | |
3e0c2f20 MS |
61 | * @prepare: called every time the buffer is passed from userspace to the |
62 | * driver, useful for cache synchronisation, optional | |
63 | * @finish: called every time the buffer is passed back from the driver | |
64 | * to the userspace, also optional | |
e23ccc0a PO |
65 | * @vaddr: return a kernel virtual address to a given memory buffer |
66 | * associated with the passed private structure or NULL if no | |
67 | * such mapping exists | |
68 | * @cookie: return allocator specific cookie for a given memory buffer | |
69 | * associated with the passed private structure or NULL if not | |
70 | * available | |
71 | * @num_users: return the current number of users of a memory buffer; | |
72 | * return 1 if the videobuf layer (or actually the driver using | |
73 | * it) is the only user | |
74 | * @mmap: setup a userspace mapping for a given memory buffer under | |
75 | * the provided virtual memory region | |
76 | * | |
77 | * Required ops for USERPTR types: get_userptr, put_userptr. | |
78 | * Required ops for MMAP types: alloc, put, num_users, mmap. | |
b25748fe | 79 | * Required ops for read/write access types: alloc, put, num_users, vaddr |
c5384048 SS |
80 | * Required ops for DMABUF types: attach_dmabuf, detach_dmabuf, map_dmabuf, |
81 | * unmap_dmabuf. | |
e23ccc0a PO |
82 | */ |
83 | struct vb2_mem_ops { | |
b6ba2057 | 84 | void *(*alloc)(void *alloc_ctx, unsigned long size, gfp_t gfp_flags); |
e23ccc0a | 85 | void (*put)(void *buf_priv); |
83ae7c5a | 86 | struct dma_buf *(*get_dmabuf)(void *buf_priv); |
e23ccc0a PO |
87 | |
88 | void *(*get_userptr)(void *alloc_ctx, unsigned long vaddr, | |
89 | unsigned long size, int write); | |
90 | void (*put_userptr)(void *buf_priv); | |
91 | ||
3e0c2f20 MS |
92 | void (*prepare)(void *buf_priv); |
93 | void (*finish)(void *buf_priv); | |
94 | ||
c5384048 SS |
95 | void *(*attach_dmabuf)(void *alloc_ctx, struct dma_buf *dbuf, |
96 | unsigned long size, int write); | |
97 | void (*detach_dmabuf)(void *buf_priv); | |
98 | int (*map_dmabuf)(void *buf_priv); | |
99 | void (*unmap_dmabuf)(void *buf_priv); | |
100 | ||
e23ccc0a PO |
101 | void *(*vaddr)(void *buf_priv); |
102 | void *(*cookie)(void *buf_priv); | |
103 | ||
104 | unsigned int (*num_users)(void *buf_priv); | |
105 | ||
106 | int (*mmap)(void *buf_priv, struct vm_area_struct *vma); | |
107 | }; | |
108 | ||
109 | struct vb2_plane { | |
110 | void *mem_priv; | |
c5384048 SS |
111 | struct dma_buf *dbuf; |
112 | unsigned int dbuf_mapped; | |
e23ccc0a PO |
113 | }; |
114 | ||
115 | /** | |
116 | * enum vb2_io_modes - queue access methods | |
117 | * @VB2_MMAP: driver supports MMAP with streaming API | |
118 | * @VB2_USERPTR: driver supports USERPTR with streaming API | |
119 | * @VB2_READ: driver supports read() style access | |
120 | * @VB2_WRITE: driver supports write() style access | |
c5384048 | 121 | * @VB2_DMABUF: driver supports DMABUF with streaming API |
e23ccc0a PO |
122 | */ |
123 | enum vb2_io_modes { | |
124 | VB2_MMAP = (1 << 0), | |
125 | VB2_USERPTR = (1 << 1), | |
126 | VB2_READ = (1 << 2), | |
127 | VB2_WRITE = (1 << 3), | |
c5384048 | 128 | VB2_DMABUF = (1 << 4), |
e23ccc0a PO |
129 | }; |
130 | ||
131 | /** | |
132 | * enum vb2_fileio_flags - flags for selecting a mode of the file io emulator, | |
133 | * by default the 'streaming' style is used by the file io emulator | |
134 | * @VB2_FILEIO_READ_ONCE: report EOF after reading the first buffer | |
135 | * @VB2_FILEIO_WRITE_IMMEDIATELY: queue buffer after each write() call | |
136 | */ | |
137 | enum vb2_fileio_flags { | |
138 | VB2_FILEIO_READ_ONCE = (1 << 0), | |
139 | VB2_FILEIO_WRITE_IMMEDIATELY = (1 << 1), | |
140 | }; | |
141 | ||
142 | /** | |
143 | * enum vb2_buffer_state - current video buffer state | |
144 | * @VB2_BUF_STATE_DEQUEUED: buffer under userspace control | |
ebc087d0 | 145 | * @VB2_BUF_STATE_PREPARED: buffer prepared in videobuf and by the driver |
e23ccc0a PO |
146 | * @VB2_BUF_STATE_QUEUED: buffer queued in videobuf, but not in driver |
147 | * @VB2_BUF_STATE_ACTIVE: buffer queued in driver and possibly used | |
148 | * in a hardware operation | |
149 | * @VB2_BUF_STATE_DONE: buffer returned from driver to videobuf, but | |
150 | * not yet dequeued to userspace | |
151 | * @VB2_BUF_STATE_ERROR: same as above, but the operation on the buffer | |
152 | * has ended with an error, which will be reported | |
153 | * to the userspace when it is dequeued | |
154 | */ | |
155 | enum vb2_buffer_state { | |
156 | VB2_BUF_STATE_DEQUEUED, | |
ebc087d0 | 157 | VB2_BUF_STATE_PREPARED, |
e23ccc0a PO |
158 | VB2_BUF_STATE_QUEUED, |
159 | VB2_BUF_STATE_ACTIVE, | |
160 | VB2_BUF_STATE_DONE, | |
161 | VB2_BUF_STATE_ERROR, | |
162 | }; | |
163 | ||
164 | struct vb2_queue; | |
165 | ||
166 | /** | |
167 | * struct vb2_buffer - represents a video buffer | |
168 | * @v4l2_buf: struct v4l2_buffer associated with this buffer; can | |
169 | * be read by the driver and relevant entries can be | |
170 | * changed by the driver in case of CAPTURE types | |
171 | * (such as timestamp) | |
172 | * @v4l2_planes: struct v4l2_planes associated with this buffer; can | |
173 | * be read by the driver and relevant entries can be | |
174 | * changed by the driver in case of CAPTURE types | |
175 | * (such as bytesused); NOTE that even for single-planar | |
176 | * types, the v4l2_planes[0] struct should be used | |
177 | * instead of v4l2_buf for filling bytesused - drivers | |
178 | * should use the vb2_set_plane_payload() function for that | |
179 | * @vb2_queue: the queue to which this driver belongs | |
180 | * @num_planes: number of planes in the buffer | |
181 | * on an internal driver queue | |
182 | * @state: current buffer state; do not change | |
183 | * @queued_entry: entry on the queued buffers list, which holds all | |
184 | * buffers queued from userspace | |
185 | * @done_entry: entry on the list that stores all buffers ready to | |
186 | * be dequeued to userspace | |
187 | * @planes: private per-plane information; do not change | |
e23ccc0a PO |
188 | */ |
189 | struct vb2_buffer { | |
190 | struct v4l2_buffer v4l2_buf; | |
191 | struct v4l2_plane v4l2_planes[VIDEO_MAX_PLANES]; | |
192 | ||
193 | struct vb2_queue *vb2_queue; | |
194 | ||
195 | unsigned int num_planes; | |
196 | ||
197 | /* Private: internal use only */ | |
198 | enum vb2_buffer_state state; | |
199 | ||
200 | struct list_head queued_entry; | |
201 | struct list_head done_entry; | |
202 | ||
203 | struct vb2_plane planes[VIDEO_MAX_PLANES]; | |
e23ccc0a PO |
204 | }; |
205 | ||
206 | /** | |
207 | * struct vb2_ops - driver-specific callbacks | |
208 | * | |
2d86401c GL |
209 | * @queue_setup: called from VIDIOC_REQBUFS and VIDIOC_CREATE_BUFS |
210 | * handlers before memory allocation, or, if | |
211 | * *num_planes != 0, after the allocation to verify a | |
212 | * smaller number of buffers. Driver should return | |
213 | * the required number of buffers in *num_buffers, the | |
214 | * required number of planes per buffer in *num_planes; the | |
215 | * size of each plane should be set in the sizes[] array | |
216 | * and optional per-plane allocator specific context in the | |
217 | * alloc_ctxs[] array. When called from VIDIOC_REQBUFS, | |
218 | * fmt == NULL, the driver has to use the currently | |
219 | * configured format and *num_buffers is the total number | |
220 | * of buffers, that are being allocated. When called from | |
221 | * VIDIOC_CREATE_BUFS, fmt != NULL and it describes the | |
5548a382 LP |
222 | * target frame format (if the format isn't valid the |
223 | * callback must return -EINVAL). In this case *num_buffers | |
224 | * are being allocated additionally to q->num_buffers. | |
e23ccc0a PO |
225 | * @wait_prepare: release any locks taken while calling vb2 functions; |
226 | * it is called before an ioctl needs to wait for a new | |
227 | * buffer to arrive; required to avoid a deadlock in | |
228 | * blocking access type | |
229 | * @wait_finish: reacquire all locks released in the previous callback; | |
230 | * required to continue operation after sleeping while | |
231 | * waiting for a new buffer to arrive | |
232 | * @buf_init: called once after allocating a buffer (in MMAP case) | |
233 | * or after acquiring a new USERPTR buffer; drivers may | |
234 | * perform additional buffer-related initialization; | |
235 | * initialization failure (return != 0) will prevent | |
236 | * queue setup from completing successfully; optional | |
2d86401c GL |
237 | * @buf_prepare: called every time the buffer is queued from userspace |
238 | * and from the VIDIOC_PREPARE_BUF ioctl; drivers may | |
239 | * perform any initialization required before each hardware | |
5548a382 LP |
240 | * operation in this callback; drivers that support |
241 | * VIDIOC_CREATE_BUFS must also validate the buffer size; | |
242 | * if an error is returned, the buffer will not be queued | |
243 | * in driver; optional | |
e23ccc0a PO |
244 | * @buf_finish: called before every dequeue of the buffer back to |
245 | * userspace; drivers may perform any operations required | |
246 | * before userspace accesses the buffer; optional | |
247 | * @buf_cleanup: called once before the buffer is freed; drivers may | |
248 | * perform any additional cleanup; optional | |
bd323e28 MS |
249 | * @start_streaming: called once to enter 'streaming' state; the driver may |
250 | * receive buffers with @buf_queue callback before | |
251 | * @start_streaming is called; the driver gets the number | |
252 | * of already queued buffers in count parameter; driver | |
253 | * can return an error if hardware fails or not enough | |
254 | * buffers has been queued, in such case all buffers that | |
255 | * have been already given by the @buf_queue callback are | |
256 | * invalidated. | |
e23ccc0a PO |
257 | * @stop_streaming: called when 'streaming' state must be disabled; driver |
258 | * should stop any DMA transactions or wait until they | |
259 | * finish and give back all buffers it got from buf_queue() | |
260 | * callback; may use vb2_wait_for_all_buffers() function | |
261 | * @buf_queue: passes buffer vb to the driver; driver may start | |
262 | * hardware operation on this buffer; driver should give | |
bd323e28 MS |
263 | * the buffer back by calling vb2_buffer_done() function; |
264 | * it is allways called after calling STREAMON ioctl; | |
265 | * might be called before start_streaming callback if user | |
266 | * pre-queued buffers before calling STREAMON | |
e23ccc0a PO |
267 | */ |
268 | struct vb2_ops { | |
fc714e70 GL |
269 | int (*queue_setup)(struct vb2_queue *q, const struct v4l2_format *fmt, |
270 | unsigned int *num_buffers, unsigned int *num_planes, | |
271 | unsigned int sizes[], void *alloc_ctxs[]); | |
e23ccc0a PO |
272 | |
273 | void (*wait_prepare)(struct vb2_queue *q); | |
274 | void (*wait_finish)(struct vb2_queue *q); | |
275 | ||
276 | int (*buf_init)(struct vb2_buffer *vb); | |
277 | int (*buf_prepare)(struct vb2_buffer *vb); | |
278 | int (*buf_finish)(struct vb2_buffer *vb); | |
279 | void (*buf_cleanup)(struct vb2_buffer *vb); | |
280 | ||
bd323e28 | 281 | int (*start_streaming)(struct vb2_queue *q, unsigned int count); |
e23ccc0a PO |
282 | int (*stop_streaming)(struct vb2_queue *q); |
283 | ||
284 | void (*buf_queue)(struct vb2_buffer *vb); | |
285 | }; | |
286 | ||
5a5adf6b HV |
287 | struct v4l2_fh; |
288 | ||
e23ccc0a PO |
289 | /** |
290 | * struct vb2_queue - a videobuf queue | |
291 | * | |
292 | * @type: queue type (see V4L2_BUF_TYPE_* in linux/videodev2.h | |
293 | * @io_modes: supported io methods (see vb2_io_modes enum) | |
294 | * @io_flags: additional io flags (see vb2_fileio_flags enum) | |
5a5adf6b HV |
295 | * @lock: pointer to a mutex that protects the vb2_queue struct. The |
296 | * driver can set this to a mutex to let the v4l2 core serialize | |
297 | * the queuing ioctls. If the driver wants to handle locking | |
298 | * itself, then this should be set to NULL. This lock is not used | |
299 | * by the videobuf2 core API. | |
300 | * @owner: The filehandle that 'owns' the buffers, i.e. the filehandle | |
301 | * that called reqbufs, create_buffers or started fileio. | |
302 | * This field is not used by the videobuf2 core API, but it allows | |
303 | * drivers to easily associate an owner filehandle with the queue. | |
e23ccc0a PO |
304 | * @ops: driver-specific callbacks |
305 | * @mem_ops: memory allocator specific callbacks | |
306 | * @drv_priv: driver private data | |
307 | * @buf_struct_size: size of the driver-specific buffer structure; | |
308 | * "0" indicates the driver doesn't want to use a custom buffer | |
309 | * structure type, so sizeof(struct vb2_buffer) will is used | |
b6ba2057 HV |
310 | * @gfp_flags: additional gfp flags used when allocating the buffers. |
311 | * Typically this is 0, but it may be e.g. GFP_DMA or __GFP_DMA32 | |
312 | * to force the buffer allocation to a specific memory zone. | |
e23ccc0a PO |
313 | * |
314 | * @memory: current memory type used | |
315 | * @bufs: videobuf buffer structures | |
316 | * @num_buffers: number of allocated/used buffers | |
317 | * @queued_list: list of buffers currently queued from userspace | |
318 | * @queued_count: number of buffers owned by the driver | |
319 | * @done_list: list of buffers ready to be dequeued to userspace | |
320 | * @done_lock: lock to protect done_list list | |
321 | * @done_wq: waitqueue for processes waiting for buffers ready to be dequeued | |
322 | * @alloc_ctx: memory type/allocator-specific contexts for each plane | |
323 | * @streaming: current streaming state | |
b25748fe | 324 | * @fileio: file io emulator internal data, used only if emulator is active |
e23ccc0a PO |
325 | */ |
326 | struct vb2_queue { | |
327 | enum v4l2_buf_type type; | |
328 | unsigned int io_modes; | |
329 | unsigned int io_flags; | |
5a5adf6b HV |
330 | struct mutex *lock; |
331 | struct v4l2_fh *owner; | |
e23ccc0a PO |
332 | |
333 | const struct vb2_ops *ops; | |
334 | const struct vb2_mem_ops *mem_ops; | |
335 | void *drv_priv; | |
336 | unsigned int buf_struct_size; | |
6aa69f99 | 337 | u32 timestamp_type; |
b6ba2057 | 338 | gfp_t gfp_flags; |
e23ccc0a PO |
339 | |
340 | /* private: internal use only */ | |
341 | enum v4l2_memory memory; | |
342 | struct vb2_buffer *bufs[VIDEO_MAX_FRAME]; | |
343 | unsigned int num_buffers; | |
344 | ||
345 | struct list_head queued_list; | |
346 | ||
347 | atomic_t queued_count; | |
348 | struct list_head done_list; | |
349 | spinlock_t done_lock; | |
350 | wait_queue_head_t done_wq; | |
351 | ||
352 | void *alloc_ctx[VIDEO_MAX_PLANES]; | |
035aa147 | 353 | unsigned int plane_sizes[VIDEO_MAX_PLANES]; |
e23ccc0a PO |
354 | |
355 | unsigned int streaming:1; | |
b25748fe MS |
356 | |
357 | struct vb2_fileio_data *fileio; | |
e23ccc0a PO |
358 | }; |
359 | ||
360 | void *vb2_plane_vaddr(struct vb2_buffer *vb, unsigned int plane_no); | |
361 | void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no); | |
362 | ||
363 | void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state); | |
364 | int vb2_wait_for_all_buffers(struct vb2_queue *q); | |
365 | ||
366 | int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b); | |
367 | int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req); | |
368 | ||
2d86401c GL |
369 | int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create); |
370 | int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b); | |
371 | ||
896f38f5 | 372 | int __must_check vb2_queue_init(struct vb2_queue *q); |
e23ccc0a PO |
373 | |
374 | void vb2_queue_release(struct vb2_queue *q); | |
375 | ||
376 | int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b); | |
83ae7c5a | 377 | int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb); |
e23ccc0a PO |
378 | int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking); |
379 | ||
380 | int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type); | |
381 | int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type); | |
382 | ||
383 | int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma); | |
6f524ec1 SJ |
384 | #ifndef CONFIG_MMU |
385 | unsigned long vb2_get_unmapped_area(struct vb2_queue *q, | |
386 | unsigned long addr, | |
387 | unsigned long len, | |
388 | unsigned long pgoff, | |
389 | unsigned long flags); | |
390 | #endif | |
e23ccc0a | 391 | unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait); |
b25748fe MS |
392 | size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count, |
393 | loff_t *ppos, int nonblock); | |
819585bc | 394 | size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count, |
b25748fe | 395 | loff_t *ppos, int nonblock); |
e23ccc0a PO |
396 | |
397 | /** | |
398 | * vb2_is_streaming() - return streaming status of the queue | |
399 | * @q: videobuf queue | |
400 | */ | |
401 | static inline bool vb2_is_streaming(struct vb2_queue *q) | |
402 | { | |
403 | return q->streaming; | |
404 | } | |
405 | ||
406 | /** | |
407 | * vb2_is_busy() - return busy status of the queue | |
408 | * @q: videobuf queue | |
409 | * | |
410 | * This function checks if queue has any buffers allocated. | |
411 | */ | |
412 | static inline bool vb2_is_busy(struct vb2_queue *q) | |
413 | { | |
414 | return (q->num_buffers > 0); | |
415 | } | |
416 | ||
417 | /** | |
418 | * vb2_get_drv_priv() - return driver private data associated with the queue | |
419 | * @q: videobuf queue | |
420 | */ | |
421 | static inline void *vb2_get_drv_priv(struct vb2_queue *q) | |
422 | { | |
423 | return q->drv_priv; | |
424 | } | |
425 | ||
426 | /** | |
427 | * vb2_set_plane_payload() - set bytesused for the plane plane_no | |
428 | * @vb: buffer for which plane payload should be set | |
429 | * @plane_no: plane number for which payload should be set | |
430 | * @size: payload in bytes | |
431 | */ | |
432 | static inline void vb2_set_plane_payload(struct vb2_buffer *vb, | |
433 | unsigned int plane_no, unsigned long size) | |
434 | { | |
435 | if (plane_no < vb->num_planes) | |
436 | vb->v4l2_planes[plane_no].bytesused = size; | |
437 | } | |
438 | ||
439 | /** | |
9f00edae | 440 | * vb2_get_plane_payload() - get bytesused for the plane plane_no |
e23ccc0a PO |
441 | * @vb: buffer for which plane payload should be set |
442 | * @plane_no: plane number for which payload should be set | |
443 | * @size: payload in bytes | |
444 | */ | |
445 | static inline unsigned long vb2_get_plane_payload(struct vb2_buffer *vb, | |
446 | unsigned int plane_no) | |
447 | { | |
448 | if (plane_no < vb->num_planes) | |
449 | return vb->v4l2_planes[plane_no].bytesused; | |
450 | return 0; | |
451 | } | |
452 | ||
453 | /** | |
454 | * vb2_plane_size() - return plane size in bytes | |
455 | * @vb: buffer for which plane size should be returned | |
456 | * @plane_no: plane number for which size should be returned | |
457 | */ | |
458 | static inline unsigned long | |
459 | vb2_plane_size(struct vb2_buffer *vb, unsigned int plane_no) | |
460 | { | |
461 | if (plane_no < vb->num_planes) | |
462 | return vb->v4l2_planes[plane_no].length; | |
463 | return 0; | |
464 | } | |
465 | ||
4c1ffcaa HV |
466 | /* |
467 | * The following functions are not part of the vb2 core API, but are simple | |
468 | * helper functions that you can use in your struct v4l2_file_operations, | |
469 | * struct v4l2_ioctl_ops and struct vb2_ops. They will serialize if vb2_queue->lock | |
470 | * or video_device->lock is set, and they will set and test vb2_queue->owner | |
471 | * to check if the calling filehandle is permitted to do the queuing operation. | |
472 | */ | |
473 | ||
474 | /* struct v4l2_ioctl_ops helpers */ | |
475 | ||
476 | int vb2_ioctl_reqbufs(struct file *file, void *priv, | |
477 | struct v4l2_requestbuffers *p); | |
478 | int vb2_ioctl_create_bufs(struct file *file, void *priv, | |
479 | struct v4l2_create_buffers *p); | |
480 | int vb2_ioctl_prepare_buf(struct file *file, void *priv, | |
481 | struct v4l2_buffer *p); | |
482 | int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p); | |
483 | int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p); | |
484 | int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p); | |
485 | int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i); | |
486 | int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i); | |
83ae7c5a TS |
487 | int vb2_ioctl_expbuf(struct file *file, void *priv, |
488 | struct v4l2_exportbuffer *p); | |
4c1ffcaa HV |
489 | |
490 | /* struct v4l2_file_operations helpers */ | |
491 | ||
492 | int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma); | |
493 | int vb2_fop_release(struct file *file); | |
819585bc | 494 | ssize_t vb2_fop_write(struct file *file, const char __user *buf, |
4c1ffcaa HV |
495 | size_t count, loff_t *ppos); |
496 | ssize_t vb2_fop_read(struct file *file, char __user *buf, | |
497 | size_t count, loff_t *ppos); | |
498 | unsigned int vb2_fop_poll(struct file *file, poll_table *wait); | |
499 | #ifndef CONFIG_MMU | |
500 | unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr, | |
501 | unsigned long len, unsigned long pgoff, unsigned long flags); | |
502 | #endif | |
503 | ||
504 | /* struct vb2_ops helpers, only use if vq->lock is non-NULL. */ | |
505 | ||
506 | void vb2_ops_wait_prepare(struct vb2_queue *vq); | |
507 | void vb2_ops_wait_finish(struct vb2_queue *vq); | |
508 | ||
e23ccc0a | 509 | #endif /* _MEDIA_VIDEOBUF2_CORE_H */ |