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c139990e JS |
1 | /* |
2 | * videobuf2-v4l2.c - V4L2 driver helper framework | |
3 | * | |
4 | * Copyright (C) 2010 Samsung Electronics | |
5 | * | |
6 | * Author: Pawel Osciak <pawel@osciak.com> | |
7 | * Marek Szyprowski <m.szyprowski@samsung.com> | |
8 | * | |
9 | * The vb2_thread implementation was based on code from videobuf-dvb.c: | |
10 | * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs] | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation. | |
15 | */ | |
16 | ||
17 | #include <linux/err.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/mm.h> | |
21 | #include <linux/poll.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/sched.h> | |
24 | #include <linux/freezer.h> | |
25 | #include <linux/kthread.h> | |
26 | ||
3c5be988 JS |
27 | #include <media/v4l2-dev.h> |
28 | #include <media/v4l2-fh.h> | |
29 | #include <media/v4l2-event.h> | |
30 | #include <media/v4l2-common.h> | |
31 | ||
c139990e JS |
32 | #include <media/videobuf2-v4l2.h> |
33 | ||
3c5be988 JS |
34 | #include "videobuf2-internal.h" |
35 | ||
36 | /* Flags that are set by the vb2 core */ | |
37 | #define V4L2_BUFFER_MASK_FLAGS (V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_QUEUED | \ | |
38 | V4L2_BUF_FLAG_DONE | V4L2_BUF_FLAG_ERROR | \ | |
39 | V4L2_BUF_FLAG_PREPARED | \ | |
40 | V4L2_BUF_FLAG_TIMESTAMP_MASK) | |
41 | /* Output buffer flags that should be passed on to the driver */ | |
42 | #define V4L2_BUFFER_OUT_FLAGS (V4L2_BUF_FLAG_PFRAME | V4L2_BUF_FLAG_BFRAME | \ | |
43 | V4L2_BUF_FLAG_KEYFRAME | V4L2_BUF_FLAG_TIMECODE) | |
44 | ||
45 | /** | |
46 | * __verify_planes_array() - verify that the planes array passed in struct | |
47 | * v4l2_buffer from userspace can be safely used | |
48 | */ | |
49 | static int __verify_planes_array(struct vb2_buffer *vb, const struct v4l2_buffer *b) | |
50 | { | |
51 | if (!V4L2_TYPE_IS_MULTIPLANAR(b->type)) | |
52 | return 0; | |
53 | ||
54 | /* Is memory for copying plane information present? */ | |
55 | if (NULL == b->m.planes) { | |
56 | dprintk(1, "multi-planar buffer passed but " | |
57 | "planes array not provided\n"); | |
58 | return -EINVAL; | |
59 | } | |
60 | ||
61 | if (b->length < vb->num_planes || b->length > VB2_MAX_PLANES) { | |
62 | dprintk(1, "incorrect planes array length, " | |
63 | "expected %d, got %d\n", vb->num_planes, b->length); | |
64 | return -EINVAL; | |
65 | } | |
66 | ||
67 | return 0; | |
68 | } | |
69 | ||
70 | /** | |
71 | * __verify_length() - Verify that the bytesused value for each plane fits in | |
72 | * the plane length and that the data offset doesn't exceed the bytesused value. | |
73 | */ | |
74 | static int __verify_length(struct vb2_buffer *vb, const struct v4l2_buffer *b) | |
75 | { | |
76 | unsigned int length; | |
77 | unsigned int bytesused; | |
78 | unsigned int plane; | |
79 | ||
80 | if (!V4L2_TYPE_IS_OUTPUT(b->type)) | |
81 | return 0; | |
82 | ||
83 | if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { | |
84 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
85 | length = (b->memory == VB2_MEMORY_USERPTR || | |
86 | b->memory == VB2_MEMORY_DMABUF) | |
87 | ? b->m.planes[plane].length | |
88 | : vb->planes[plane].length; | |
89 | bytesused = b->m.planes[plane].bytesused | |
90 | ? b->m.planes[plane].bytesused : length; | |
91 | ||
92 | if (b->m.planes[plane].bytesused > length) | |
93 | return -EINVAL; | |
94 | ||
95 | if (b->m.planes[plane].data_offset > 0 && | |
96 | b->m.planes[plane].data_offset >= bytesused) | |
97 | return -EINVAL; | |
98 | } | |
99 | } else { | |
100 | length = (b->memory == VB2_MEMORY_USERPTR) | |
101 | ? b->length : vb->planes[0].length; | |
102 | ||
103 | if (b->bytesused > length) | |
104 | return -EINVAL; | |
105 | } | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | static int __set_timestamp(struct vb2_buffer *vb, const void *pb) | |
111 | { | |
112 | const struct v4l2_buffer *b = pb; | |
113 | struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); | |
114 | struct vb2_queue *q = vb->vb2_queue; | |
115 | ||
116 | if (q->is_output) { | |
117 | /* | |
118 | * For output buffers copy the timestamp if needed, | |
119 | * and the timecode field and flag if needed. | |
120 | */ | |
121 | if ((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == | |
122 | V4L2_BUF_FLAG_TIMESTAMP_COPY) | |
123 | vbuf->timestamp = b->timestamp; | |
124 | vbuf->flags |= b->flags & V4L2_BUF_FLAG_TIMECODE; | |
125 | if (b->flags & V4L2_BUF_FLAG_TIMECODE) | |
126 | vbuf->timecode = b->timecode; | |
127 | } | |
128 | return 0; | |
129 | }; | |
130 | ||
131 | static void vb2_warn_zero_bytesused(struct vb2_buffer *vb) | |
132 | { | |
133 | static bool check_once; | |
134 | ||
135 | if (check_once) | |
136 | return; | |
137 | ||
138 | check_once = true; | |
139 | WARN_ON(1); | |
140 | ||
141 | pr_warn("use of bytesused == 0 is deprecated and will be removed in the future,\n"); | |
142 | if (vb->vb2_queue->allow_zero_bytesused) | |
143 | pr_warn("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n"); | |
144 | else | |
145 | pr_warn("use the actual size instead.\n"); | |
146 | } | |
147 | ||
148 | static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b, | |
149 | const char *opname) | |
150 | { | |
151 | if (b->type != q->type) { | |
152 | dprintk(1, "%s: invalid buffer type\n", opname); | |
153 | return -EINVAL; | |
154 | } | |
155 | ||
156 | if (b->index >= q->num_buffers) { | |
157 | dprintk(1, "%s: buffer index out of range\n", opname); | |
158 | return -EINVAL; | |
159 | } | |
160 | ||
161 | if (q->bufs[b->index] == NULL) { | |
162 | /* Should never happen */ | |
163 | dprintk(1, "%s: buffer is NULL\n", opname); | |
164 | return -EINVAL; | |
165 | } | |
166 | ||
167 | if (b->memory != q->memory) { | |
168 | dprintk(1, "%s: invalid memory type\n", opname); | |
169 | return -EINVAL; | |
170 | } | |
171 | ||
172 | return __verify_planes_array(q->bufs[b->index], b); | |
173 | } | |
174 | ||
175 | /** | |
176 | * __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be | |
177 | * returned to userspace | |
178 | */ | |
179 | static int __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb) | |
180 | { | |
181 | struct v4l2_buffer *b = pb; | |
182 | struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); | |
183 | struct vb2_queue *q = vb->vb2_queue; | |
184 | unsigned int plane; | |
185 | ||
186 | /* Copy back data such as timestamp, flags, etc. */ | |
187 | b->index = vb->index; | |
188 | b->type = vb->type; | |
189 | b->memory = vb->memory; | |
190 | b->bytesused = 0; | |
191 | ||
192 | b->flags = vbuf->flags; | |
193 | b->field = vbuf->field; | |
194 | b->timestamp = vbuf->timestamp; | |
195 | b->timecode = vbuf->timecode; | |
196 | b->sequence = vbuf->sequence; | |
197 | b->reserved2 = 0; | |
198 | b->reserved = 0; | |
199 | ||
200 | if (q->is_multiplanar) { | |
201 | /* | |
202 | * Fill in plane-related data if userspace provided an array | |
203 | * for it. The caller has already verified memory and size. | |
204 | */ | |
205 | b->length = vb->num_planes; | |
206 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
207 | struct v4l2_plane *pdst = &b->m.planes[plane]; | |
208 | struct vb2_plane *psrc = &vb->planes[plane]; | |
209 | ||
210 | pdst->bytesused = psrc->bytesused; | |
211 | pdst->length = psrc->length; | |
212 | if (q->memory == VB2_MEMORY_MMAP) | |
213 | pdst->m.mem_offset = psrc->m.offset; | |
214 | else if (q->memory == VB2_MEMORY_USERPTR) | |
215 | pdst->m.userptr = psrc->m.userptr; | |
216 | else if (q->memory == VB2_MEMORY_DMABUF) | |
217 | pdst->m.fd = psrc->m.fd; | |
218 | pdst->data_offset = psrc->data_offset; | |
219 | memset(pdst->reserved, 0, sizeof(pdst->reserved)); | |
220 | } | |
221 | } else { | |
222 | /* | |
223 | * We use length and offset in v4l2_planes array even for | |
224 | * single-planar buffers, but userspace does not. | |
225 | */ | |
226 | b->length = vb->planes[0].length; | |
227 | b->bytesused = vb->planes[0].bytesused; | |
228 | if (q->memory == VB2_MEMORY_MMAP) | |
229 | b->m.offset = vb->planes[0].m.offset; | |
230 | else if (q->memory == VB2_MEMORY_USERPTR) | |
231 | b->m.userptr = vb->planes[0].m.userptr; | |
232 | else if (q->memory == VB2_MEMORY_DMABUF) | |
233 | b->m.fd = vb->planes[0].m.fd; | |
234 | } | |
235 | ||
236 | /* | |
237 | * Clear any buffer state related flags. | |
238 | */ | |
239 | b->flags &= ~V4L2_BUFFER_MASK_FLAGS; | |
240 | b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK; | |
241 | if ((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) != | |
242 | V4L2_BUF_FLAG_TIMESTAMP_COPY) { | |
243 | /* | |
244 | * For non-COPY timestamps, drop timestamp source bits | |
245 | * and obtain the timestamp source from the queue. | |
246 | */ | |
247 | b->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; | |
248 | b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK; | |
249 | } | |
250 | ||
251 | switch (vb->state) { | |
252 | case VB2_BUF_STATE_QUEUED: | |
253 | case VB2_BUF_STATE_ACTIVE: | |
254 | b->flags |= V4L2_BUF_FLAG_QUEUED; | |
255 | break; | |
256 | case VB2_BUF_STATE_ERROR: | |
257 | b->flags |= V4L2_BUF_FLAG_ERROR; | |
258 | /* fall through */ | |
259 | case VB2_BUF_STATE_DONE: | |
260 | b->flags |= V4L2_BUF_FLAG_DONE; | |
261 | break; | |
262 | case VB2_BUF_STATE_PREPARED: | |
263 | b->flags |= V4L2_BUF_FLAG_PREPARED; | |
264 | break; | |
265 | case VB2_BUF_STATE_PREPARING: | |
266 | case VB2_BUF_STATE_DEQUEUED: | |
267 | case VB2_BUF_STATE_REQUEUEING: | |
268 | /* nothing */ | |
269 | break; | |
270 | } | |
271 | ||
272 | if (vb2_buffer_in_use(q, vb)) | |
273 | b->flags |= V4L2_BUF_FLAG_MAPPED; | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
278 | /** | |
279 | * __fill_vb2_buffer() - fill a vb2_buffer with information provided in a | |
280 | * v4l2_buffer by the userspace. It also verifies that struct | |
281 | * v4l2_buffer has a valid number of planes. | |
282 | */ | |
283 | static int __fill_vb2_buffer(struct vb2_buffer *vb, | |
284 | const void *pb, struct vb2_plane *planes) | |
285 | { | |
286 | struct vb2_queue *q = vb->vb2_queue; | |
287 | const struct v4l2_buffer *b = pb; | |
288 | struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); | |
289 | unsigned int plane; | |
290 | int ret; | |
291 | ||
292 | ret = __verify_length(vb, b); | |
293 | if (ret < 0) { | |
294 | dprintk(1, "plane parameters verification failed: %d\n", ret); | |
295 | return ret; | |
296 | } | |
297 | if (b->field == V4L2_FIELD_ALTERNATE && q->is_output) { | |
298 | /* | |
299 | * If the format's field is ALTERNATE, then the buffer's field | |
300 | * should be either TOP or BOTTOM, not ALTERNATE since that | |
301 | * makes no sense. The driver has to know whether the | |
302 | * buffer represents a top or a bottom field in order to | |
303 | * program any DMA correctly. Using ALTERNATE is wrong, since | |
304 | * that just says that it is either a top or a bottom field, | |
305 | * but not which of the two it is. | |
306 | */ | |
307 | dprintk(1, "the field is incorrectly set to ALTERNATE " | |
308 | "for an output buffer\n"); | |
309 | return -EINVAL; | |
310 | } | |
311 | vbuf->timestamp.tv_sec = 0; | |
312 | vbuf->timestamp.tv_usec = 0; | |
313 | vbuf->sequence = 0; | |
314 | ||
315 | if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { | |
316 | if (b->memory == VB2_MEMORY_USERPTR) { | |
317 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
318 | planes[plane].m.userptr = | |
319 | b->m.planes[plane].m.userptr; | |
320 | planes[plane].length = | |
321 | b->m.planes[plane].length; | |
322 | } | |
323 | } | |
324 | if (b->memory == VB2_MEMORY_DMABUF) { | |
325 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
326 | planes[plane].m.fd = | |
327 | b->m.planes[plane].m.fd; | |
328 | planes[plane].length = | |
329 | b->m.planes[plane].length; | |
330 | } | |
331 | } | |
332 | ||
333 | /* Fill in driver-provided information for OUTPUT types */ | |
334 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { | |
335 | /* | |
336 | * Will have to go up to b->length when API starts | |
337 | * accepting variable number of planes. | |
338 | * | |
339 | * If bytesused == 0 for the output buffer, then fall | |
340 | * back to the full buffer size. In that case | |
341 | * userspace clearly never bothered to set it and | |
342 | * it's a safe assumption that they really meant to | |
343 | * use the full plane sizes. | |
344 | * | |
345 | * Some drivers, e.g. old codec drivers, use bytesused == 0 | |
346 | * as a way to indicate that streaming is finished. | |
347 | * In that case, the driver should use the | |
348 | * allow_zero_bytesused flag to keep old userspace | |
349 | * applications working. | |
350 | */ | |
351 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
352 | struct vb2_plane *pdst = &planes[plane]; | |
353 | struct v4l2_plane *psrc = &b->m.planes[plane]; | |
354 | ||
355 | if (psrc->bytesused == 0) | |
356 | vb2_warn_zero_bytesused(vb); | |
357 | ||
358 | if (vb->vb2_queue->allow_zero_bytesused) | |
359 | pdst->bytesused = psrc->bytesused; | |
360 | else | |
361 | pdst->bytesused = psrc->bytesused ? | |
362 | psrc->bytesused : pdst->length; | |
363 | pdst->data_offset = psrc->data_offset; | |
364 | } | |
365 | } | |
366 | } else { | |
367 | /* | |
368 | * Single-planar buffers do not use planes array, | |
369 | * so fill in relevant v4l2_buffer struct fields instead. | |
370 | * In videobuf we use our internal V4l2_planes struct for | |
371 | * single-planar buffers as well, for simplicity. | |
372 | * | |
373 | * If bytesused == 0 for the output buffer, then fall back | |
374 | * to the full buffer size as that's a sensible default. | |
375 | * | |
376 | * Some drivers, e.g. old codec drivers, use bytesused == 0 as | |
377 | * a way to indicate that streaming is finished. In that case, | |
378 | * the driver should use the allow_zero_bytesused flag to keep | |
379 | * old userspace applications working. | |
380 | */ | |
381 | if (b->memory == VB2_MEMORY_USERPTR) { | |
382 | planes[0].m.userptr = b->m.userptr; | |
383 | planes[0].length = b->length; | |
384 | } | |
385 | ||
386 | if (b->memory == VB2_MEMORY_DMABUF) { | |
387 | planes[0].m.fd = b->m.fd; | |
388 | planes[0].length = b->length; | |
389 | } | |
390 | ||
391 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { | |
392 | if (b->bytesused == 0) | |
393 | vb2_warn_zero_bytesused(vb); | |
394 | ||
395 | if (vb->vb2_queue->allow_zero_bytesused) | |
396 | planes[0].bytesused = b->bytesused; | |
397 | else | |
398 | planes[0].bytesused = b->bytesused ? | |
399 | b->bytesused : planes[0].length; | |
400 | } else | |
401 | planes[0].bytesused = 0; | |
402 | ||
403 | } | |
404 | ||
405 | /* Zero flags that the vb2 core handles */ | |
406 | vbuf->flags = b->flags & ~V4L2_BUFFER_MASK_FLAGS; | |
407 | if ((vb->vb2_queue->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) != | |
408 | V4L2_BUF_FLAG_TIMESTAMP_COPY || !V4L2_TYPE_IS_OUTPUT(b->type)) { | |
409 | /* | |
410 | * Non-COPY timestamps and non-OUTPUT queues will get | |
411 | * their timestamp and timestamp source flags from the | |
412 | * queue. | |
413 | */ | |
414 | vbuf->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; | |
415 | } | |
416 | ||
417 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { | |
418 | /* | |
419 | * For output buffers mask out the timecode flag: | |
420 | * this will be handled later in vb2_internal_qbuf(). | |
421 | * The 'field' is valid metadata for this output buffer | |
422 | * and so that needs to be copied here. | |
423 | */ | |
424 | vbuf->flags &= ~V4L2_BUF_FLAG_TIMECODE; | |
425 | vbuf->field = b->field; | |
426 | } else { | |
427 | /* Zero any output buffer flags as this is a capture buffer */ | |
428 | vbuf->flags &= ~V4L2_BUFFER_OUT_FLAGS; | |
429 | } | |
430 | ||
431 | return 0; | |
432 | } | |
433 | ||
434 | static const struct vb2_buf_ops v4l2_buf_ops = { | |
435 | .fill_user_buffer = __fill_v4l2_buffer, | |
436 | .fill_vb2_buffer = __fill_vb2_buffer, | |
437 | .set_timestamp = __set_timestamp, | |
438 | }; | |
439 | ||
440 | /** | |
441 | * vb2_querybuf() - query video buffer information | |
442 | * @q: videobuf queue | |
443 | * @b: buffer struct passed from userspace to vidioc_querybuf handler | |
444 | * in driver | |
445 | * | |
446 | * Should be called from vidioc_querybuf ioctl handler in driver. | |
447 | * This function will verify the passed v4l2_buffer structure and fill the | |
448 | * relevant information for the userspace. | |
449 | * | |
450 | * The return values from this function are intended to be directly returned | |
451 | * from vidioc_querybuf handler in driver. | |
452 | */ | |
453 | int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b) | |
454 | { | |
455 | struct vb2_buffer *vb; | |
456 | int ret; | |
457 | ||
458 | if (b->type != q->type) { | |
459 | dprintk(1, "wrong buffer type\n"); | |
460 | return -EINVAL; | |
461 | } | |
462 | ||
463 | if (b->index >= q->num_buffers) { | |
464 | dprintk(1, "buffer index out of range\n"); | |
465 | return -EINVAL; | |
466 | } | |
467 | vb = q->bufs[b->index]; | |
468 | ret = __verify_planes_array(vb, b); | |
469 | ||
470 | return ret ? ret : vb2_core_querybuf(q, b->index, b); | |
471 | } | |
472 | EXPORT_SYMBOL(vb2_querybuf); | |
473 | ||
474 | /** | |
475 | * vb2_reqbufs() - Wrapper for vb2_core_reqbufs() that also verifies | |
476 | * the memory and type values. | |
477 | * @q: videobuf2 queue | |
478 | * @req: struct passed from userspace to vidioc_reqbufs handler | |
479 | * in driver | |
480 | */ | |
481 | int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) | |
482 | { | |
483 | int ret = vb2_verify_memory_type(q, req->memory, req->type); | |
484 | ||
485 | return ret ? ret : vb2_core_reqbufs(q, req->memory, &req->count); | |
486 | } | |
487 | EXPORT_SYMBOL_GPL(vb2_reqbufs); | |
488 | ||
489 | /** | |
490 | * vb2_prepare_buf() - Pass ownership of a buffer from userspace to the kernel | |
491 | * @q: videobuf2 queue | |
492 | * @b: buffer structure passed from userspace to vidioc_prepare_buf | |
493 | * handler in driver | |
494 | * | |
495 | * Should be called from vidioc_prepare_buf ioctl handler of a driver. | |
496 | * This function: | |
497 | * 1) verifies the passed buffer, | |
498 | * 2) calls buf_prepare callback in the driver (if provided), in which | |
499 | * driver-specific buffer initialization can be performed, | |
500 | * | |
501 | * The return values from this function are intended to be directly returned | |
502 | * from vidioc_prepare_buf handler in driver. | |
503 | */ | |
504 | int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b) | |
505 | { | |
506 | int ret; | |
507 | ||
508 | if (vb2_fileio_is_active(q)) { | |
509 | dprintk(1, "file io in progress\n"); | |
510 | return -EBUSY; | |
511 | } | |
512 | ||
513 | ret = vb2_queue_or_prepare_buf(q, b, "prepare_buf"); | |
514 | ||
515 | return ret ? ret : vb2_core_prepare_buf(q, b->index, b); | |
516 | } | |
517 | EXPORT_SYMBOL_GPL(vb2_prepare_buf); | |
518 | ||
519 | /** | |
520 | * vb2_create_bufs() - Wrapper for vb2_core_create_bufs() that also verifies | |
521 | * the memory and type values. | |
522 | * @q: videobuf2 queue | |
523 | * @create: creation parameters, passed from userspace to vidioc_create_bufs | |
524 | * handler in driver | |
525 | */ | |
526 | int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) | |
527 | { | |
528 | int ret = vb2_verify_memory_type(q, create->memory, | |
529 | create->format.type); | |
530 | ||
531 | create->index = q->num_buffers; | |
532 | if (create->count == 0) | |
533 | return ret != -EBUSY ? ret : 0; | |
534 | return ret ? ret : vb2_core_create_bufs(q, create->memory, | |
535 | &create->count, &create->format); | |
536 | } | |
537 | EXPORT_SYMBOL_GPL(vb2_create_bufs); | |
538 | ||
539 | static int vb2_internal_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) | |
540 | { | |
541 | int ret = vb2_queue_or_prepare_buf(q, b, "qbuf"); | |
542 | ||
543 | return ret ? ret : vb2_core_qbuf(q, b->index, b); | |
544 | } | |
545 | ||
546 | /** | |
547 | * vb2_qbuf() - Queue a buffer from userspace | |
548 | * @q: videobuf2 queue | |
549 | * @b: buffer structure passed from userspace to vidioc_qbuf handler | |
550 | * in driver | |
551 | * | |
552 | * Should be called from vidioc_qbuf ioctl handler of a driver. | |
553 | * This function: | |
554 | * 1) verifies the passed buffer, | |
555 | * 2) if necessary, calls buf_prepare callback in the driver (if provided), in | |
556 | * which driver-specific buffer initialization can be performed, | |
557 | * 3) if streaming is on, queues the buffer in driver by the means of buf_queue | |
558 | * callback for processing. | |
559 | * | |
560 | * The return values from this function are intended to be directly returned | |
561 | * from vidioc_qbuf handler in driver. | |
562 | */ | |
563 | int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) | |
564 | { | |
565 | if (vb2_fileio_is_active(q)) { | |
566 | dprintk(1, "file io in progress\n"); | |
567 | return -EBUSY; | |
568 | } | |
569 | ||
570 | return vb2_internal_qbuf(q, b); | |
571 | } | |
572 | EXPORT_SYMBOL_GPL(vb2_qbuf); | |
573 | ||
574 | static int vb2_internal_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, | |
575 | bool nonblocking) | |
576 | { | |
577 | int ret; | |
578 | ||
579 | if (b->type != q->type) { | |
580 | dprintk(1, "invalid buffer type\n"); | |
581 | return -EINVAL; | |
582 | } | |
583 | ||
584 | ret = vb2_core_dqbuf(q, b, nonblocking); | |
585 | ||
586 | if (!ret && !q->is_output && | |
587 | b->flags & V4L2_BUF_FLAG_LAST) | |
588 | q->last_buffer_dequeued = true; | |
589 | ||
590 | return ret; | |
591 | } | |
592 | ||
593 | /** | |
594 | * vb2_dqbuf() - Dequeue a buffer to the userspace | |
595 | * @q: videobuf2 queue | |
596 | * @b: buffer structure passed from userspace to vidioc_dqbuf handler | |
597 | * in driver | |
598 | * @nonblocking: if true, this call will not sleep waiting for a buffer if no | |
599 | * buffers ready for dequeuing are present. Normally the driver | |
600 | * would be passing (file->f_flags & O_NONBLOCK) here | |
601 | * | |
602 | * Should be called from vidioc_dqbuf ioctl handler of a driver. | |
603 | * This function: | |
604 | * 1) verifies the passed buffer, | |
605 | * 2) calls buf_finish callback in the driver (if provided), in which | |
606 | * driver can perform any additional operations that may be required before | |
607 | * returning the buffer to userspace, such as cache sync, | |
608 | * 3) the buffer struct members are filled with relevant information for | |
609 | * the userspace. | |
610 | * | |
611 | * The return values from this function are intended to be directly returned | |
612 | * from vidioc_dqbuf handler in driver. | |
613 | */ | |
614 | int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) | |
615 | { | |
616 | if (vb2_fileio_is_active(q)) { | |
617 | dprintk(1, "file io in progress\n"); | |
618 | return -EBUSY; | |
619 | } | |
620 | return vb2_internal_dqbuf(q, b, nonblocking); | |
621 | } | |
622 | EXPORT_SYMBOL_GPL(vb2_dqbuf); | |
623 | ||
624 | /** | |
625 | * vb2_streamon - start streaming | |
626 | * @q: videobuf2 queue | |
627 | * @type: type argument passed from userspace to vidioc_streamon handler | |
628 | * | |
629 | * Should be called from vidioc_streamon handler of a driver. | |
630 | * This function: | |
631 | * 1) verifies current state | |
632 | * 2) passes any previously queued buffers to the driver and starts streaming | |
633 | * | |
634 | * The return values from this function are intended to be directly returned | |
635 | * from vidioc_streamon handler in the driver. | |
636 | */ | |
637 | int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type) | |
638 | { | |
639 | if (vb2_fileio_is_active(q)) { | |
640 | dprintk(1, "file io in progress\n"); | |
641 | return -EBUSY; | |
642 | } | |
643 | return vb2_core_streamon(q, type); | |
644 | } | |
645 | EXPORT_SYMBOL_GPL(vb2_streamon); | |
646 | ||
647 | /** | |
648 | * vb2_streamoff - stop streaming | |
649 | * @q: videobuf2 queue | |
650 | * @type: type argument passed from userspace to vidioc_streamoff handler | |
651 | * | |
652 | * Should be called from vidioc_streamoff handler of a driver. | |
653 | * This function: | |
654 | * 1) verifies current state, | |
655 | * 2) stop streaming and dequeues any queued buffers, including those previously | |
656 | * passed to the driver (after waiting for the driver to finish). | |
657 | * | |
658 | * This call can be used for pausing playback. | |
659 | * The return values from this function are intended to be directly returned | |
660 | * from vidioc_streamoff handler in the driver | |
661 | */ | |
662 | int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) | |
663 | { | |
664 | if (vb2_fileio_is_active(q)) { | |
665 | dprintk(1, "file io in progress\n"); | |
666 | return -EBUSY; | |
667 | } | |
668 | return vb2_core_streamoff(q, type); | |
669 | } | |
670 | EXPORT_SYMBOL_GPL(vb2_streamoff); | |
671 | ||
672 | /** | |
673 | * vb2_expbuf() - Export a buffer as a file descriptor | |
674 | * @q: videobuf2 queue | |
675 | * @eb: export buffer structure passed from userspace to vidioc_expbuf | |
676 | * handler in driver | |
677 | * | |
678 | * The return values from this function are intended to be directly returned | |
679 | * from vidioc_expbuf handler in driver. | |
680 | */ | |
681 | int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb) | |
682 | { | |
683 | return vb2_core_expbuf(q, &eb->fd, eb->type, eb->index, | |
684 | eb->plane, eb->flags); | |
685 | } | |
686 | EXPORT_SYMBOL_GPL(vb2_expbuf); | |
687 | ||
688 | /** | |
689 | * vb2_queue_init() - initialize a videobuf2 queue | |
690 | * @q: videobuf2 queue; this structure should be allocated in driver | |
691 | * | |
692 | * The vb2_queue structure should be allocated by the driver. The driver is | |
693 | * responsible of clearing it's content and setting initial values for some | |
694 | * required entries before calling this function. | |
695 | * q->ops, q->mem_ops, q->type and q->io_modes are mandatory. Please refer | |
696 | * to the struct vb2_queue description in include/media/videobuf2-core.h | |
697 | * for more information. | |
698 | */ | |
699 | int vb2_queue_init(struct vb2_queue *q) | |
700 | { | |
701 | /* | |
702 | * Sanity check | |
703 | */ | |
704 | if (WARN_ON(!q) || | |
705 | WARN_ON(q->timestamp_flags & | |
706 | ~(V4L2_BUF_FLAG_TIMESTAMP_MASK | | |
707 | V4L2_BUF_FLAG_TSTAMP_SRC_MASK))) | |
708 | return -EINVAL; | |
709 | ||
710 | /* Warn that the driver should choose an appropriate timestamp type */ | |
711 | WARN_ON((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == | |
712 | V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN); | |
713 | ||
714 | /* Warn that vb2_memory should match with v4l2_memory */ | |
715 | if (WARN_ON(VB2_MEMORY_MMAP != (int)V4L2_MEMORY_MMAP) | |
716 | || WARN_ON(VB2_MEMORY_USERPTR != (int)V4L2_MEMORY_USERPTR) | |
717 | || WARN_ON(VB2_MEMORY_DMABUF != (int)V4L2_MEMORY_DMABUF)) | |
718 | return -EINVAL; | |
719 | ||
720 | if (q->buf_struct_size == 0) | |
721 | q->buf_struct_size = sizeof(struct vb2_v4l2_buffer); | |
722 | ||
723 | q->buf_ops = &v4l2_buf_ops; | |
724 | q->is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type); | |
725 | q->is_output = V4L2_TYPE_IS_OUTPUT(q->type); | |
726 | ||
727 | return vb2_core_queue_init(q); | |
728 | } | |
729 | EXPORT_SYMBOL_GPL(vb2_queue_init); | |
730 | ||
731 | static int __vb2_init_fileio(struct vb2_queue *q, int read); | |
732 | static int __vb2_cleanup_fileio(struct vb2_queue *q); | |
733 | ||
734 | /** | |
735 | * vb2_queue_release() - stop streaming, release the queue and free memory | |
736 | * @q: videobuf2 queue | |
737 | * | |
738 | * This function stops streaming and performs necessary clean ups, including | |
739 | * freeing video buffer memory. The driver is responsible for freeing | |
740 | * the vb2_queue structure itself. | |
741 | */ | |
742 | void vb2_queue_release(struct vb2_queue *q) | |
743 | { | |
744 | __vb2_cleanup_fileio(q); | |
745 | vb2_core_queue_release(q); | |
746 | } | |
747 | EXPORT_SYMBOL_GPL(vb2_queue_release); | |
748 | ||
749 | /** | |
750 | * vb2_poll() - implements poll userspace operation | |
751 | * @q: videobuf2 queue | |
752 | * @file: file argument passed to the poll file operation handler | |
753 | * @wait: wait argument passed to the poll file operation handler | |
754 | * | |
755 | * This function implements poll file operation handler for a driver. | |
756 | * For CAPTURE queues, if a buffer is ready to be dequeued, the userspace will | |
757 | * be informed that the file descriptor of a video device is available for | |
758 | * reading. | |
759 | * For OUTPUT queues, if a buffer is ready to be dequeued, the file descriptor | |
760 | * will be reported as available for writing. | |
761 | * | |
762 | * If the driver uses struct v4l2_fh, then vb2_poll() will also check for any | |
763 | * pending events. | |
764 | * | |
765 | * The return values from this function are intended to be directly returned | |
766 | * from poll handler in driver. | |
767 | */ | |
768 | unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) | |
769 | { | |
770 | struct video_device *vfd = video_devdata(file); | |
771 | unsigned long req_events = poll_requested_events(wait); | |
772 | struct vb2_buffer *vb = NULL; | |
773 | unsigned int res = 0; | |
774 | unsigned long flags; | |
775 | ||
776 | if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) { | |
777 | struct v4l2_fh *fh = file->private_data; | |
778 | ||
779 | if (v4l2_event_pending(fh)) | |
780 | res = POLLPRI; | |
781 | else if (req_events & POLLPRI) | |
782 | poll_wait(file, &fh->wait, wait); | |
783 | } | |
784 | ||
785 | if (!q->is_output && !(req_events & (POLLIN | POLLRDNORM))) | |
786 | return res; | |
787 | if (q->is_output && !(req_events & (POLLOUT | POLLWRNORM))) | |
788 | return res; | |
789 | ||
790 | /* | |
791 | * Start file I/O emulator only if streaming API has not been used yet. | |
792 | */ | |
793 | if (q->num_buffers == 0 && !vb2_fileio_is_active(q)) { | |
794 | if (!q->is_output && (q->io_modes & VB2_READ) && | |
795 | (req_events & (POLLIN | POLLRDNORM))) { | |
796 | if (__vb2_init_fileio(q, 1)) | |
797 | return res | POLLERR; | |
798 | } | |
799 | if (q->is_output && (q->io_modes & VB2_WRITE) && | |
800 | (req_events & (POLLOUT | POLLWRNORM))) { | |
801 | if (__vb2_init_fileio(q, 0)) | |
802 | return res | POLLERR; | |
803 | /* | |
804 | * Write to OUTPUT queue can be done immediately. | |
805 | */ | |
806 | return res | POLLOUT | POLLWRNORM; | |
807 | } | |
808 | } | |
809 | ||
810 | /* | |
811 | * There is nothing to wait for if the queue isn't streaming, or if the | |
812 | * error flag is set. | |
813 | */ | |
814 | if (!vb2_is_streaming(q) || q->error) | |
815 | return res | POLLERR; | |
816 | /* | |
817 | * For compatibility with vb1: if QBUF hasn't been called yet, then | |
818 | * return POLLERR as well. This only affects capture queues, output | |
819 | * queues will always initialize waiting_for_buffers to false. | |
820 | */ | |
821 | if (q->waiting_for_buffers) | |
822 | return res | POLLERR; | |
823 | ||
824 | /* | |
4623e596 HV |
825 | * For output streams you can call write() as long as there are fewer |
826 | * buffers queued than there are buffers available. | |
3c5be988 | 827 | */ |
4623e596 | 828 | if (q->is_output && q->fileio && q->queued_count < q->num_buffers) |
3c5be988 JS |
829 | return res | POLLOUT | POLLWRNORM; |
830 | ||
831 | if (list_empty(&q->done_list)) { | |
832 | /* | |
833 | * If the last buffer was dequeued from a capture queue, | |
834 | * return immediately. DQBUF will return -EPIPE. | |
835 | */ | |
836 | if (q->last_buffer_dequeued) | |
837 | return res | POLLIN | POLLRDNORM; | |
838 | ||
839 | poll_wait(file, &q->done_wq, wait); | |
840 | } | |
841 | ||
842 | /* | |
843 | * Take first buffer available for dequeuing. | |
844 | */ | |
845 | spin_lock_irqsave(&q->done_lock, flags); | |
846 | if (!list_empty(&q->done_list)) | |
847 | vb = list_first_entry(&q->done_list, struct vb2_buffer, | |
848 | done_entry); | |
849 | spin_unlock_irqrestore(&q->done_lock, flags); | |
850 | ||
851 | if (vb && (vb->state == VB2_BUF_STATE_DONE | |
852 | || vb->state == VB2_BUF_STATE_ERROR)) { | |
853 | return (q->is_output) ? | |
854 | res | POLLOUT | POLLWRNORM : | |
855 | res | POLLIN | POLLRDNORM; | |
856 | } | |
857 | return res; | |
858 | } | |
859 | EXPORT_SYMBOL_GPL(vb2_poll); | |
860 | ||
861 | /** | |
862 | * struct vb2_fileio_buf - buffer context used by file io emulator | |
863 | * | |
864 | * vb2 provides a compatibility layer and emulator of file io (read and | |
865 | * write) calls on top of streaming API. This structure is used for | |
866 | * tracking context related to the buffers. | |
867 | */ | |
868 | struct vb2_fileio_buf { | |
869 | void *vaddr; | |
870 | unsigned int size; | |
871 | unsigned int pos; | |
872 | unsigned int queued:1; | |
873 | }; | |
874 | ||
875 | /** | |
876 | * struct vb2_fileio_data - queue context used by file io emulator | |
877 | * | |
878 | * @cur_index: the index of the buffer currently being read from or | |
879 | * written to. If equal to q->num_buffers then a new buffer | |
880 | * must be dequeued. | |
881 | * @initial_index: in the read() case all buffers are queued up immediately | |
882 | * in __vb2_init_fileio() and __vb2_perform_fileio() just cycles | |
883 | * buffers. However, in the write() case no buffers are initially | |
884 | * queued, instead whenever a buffer is full it is queued up by | |
885 | * __vb2_perform_fileio(). Only once all available buffers have | |
886 | * been queued up will __vb2_perform_fileio() start to dequeue | |
887 | * buffers. This means that initially __vb2_perform_fileio() | |
888 | * needs to know what buffer index to use when it is queuing up | |
889 | * the buffers for the first time. That initial index is stored | |
890 | * in this field. Once it is equal to q->num_buffers all | |
891 | * available buffers have been queued and __vb2_perform_fileio() | |
892 | * should start the normal dequeue/queue cycle. | |
893 | * | |
894 | * vb2 provides a compatibility layer and emulator of file io (read and | |
895 | * write) calls on top of streaming API. For proper operation it required | |
896 | * this structure to save the driver state between each call of the read | |
897 | * or write function. | |
898 | */ | |
899 | struct vb2_fileio_data { | |
900 | struct v4l2_requestbuffers req; | |
901 | struct v4l2_plane p; | |
902 | struct v4l2_buffer b; | |
903 | struct vb2_fileio_buf bufs[VB2_MAX_FRAME]; | |
904 | unsigned int cur_index; | |
905 | unsigned int initial_index; | |
906 | unsigned int q_count; | |
907 | unsigned int dq_count; | |
908 | unsigned read_once:1; | |
909 | unsigned write_immediately:1; | |
910 | }; | |
911 | ||
912 | /** | |
913 | * __vb2_init_fileio() - initialize file io emulator | |
914 | * @q: videobuf2 queue | |
915 | * @read: mode selector (1 means read, 0 means write) | |
916 | */ | |
917 | static int __vb2_init_fileio(struct vb2_queue *q, int read) | |
918 | { | |
919 | struct vb2_fileio_data *fileio; | |
920 | int i, ret; | |
921 | unsigned int count = 0; | |
922 | ||
923 | /* | |
924 | * Sanity check | |
925 | */ | |
926 | if (WARN_ON((read && !(q->io_modes & VB2_READ)) || | |
927 | (!read && !(q->io_modes & VB2_WRITE)))) | |
928 | return -EINVAL; | |
929 | ||
930 | /* | |
931 | * Check if device supports mapping buffers to kernel virtual space. | |
932 | */ | |
933 | if (!q->mem_ops->vaddr) | |
934 | return -EBUSY; | |
935 | ||
936 | /* | |
937 | * Check if streaming api has not been already activated. | |
938 | */ | |
939 | if (q->streaming || q->num_buffers > 0) | |
940 | return -EBUSY; | |
941 | ||
942 | /* | |
943 | * Start with count 1, driver can increase it in queue_setup() | |
944 | */ | |
945 | count = 1; | |
946 | ||
947 | dprintk(3, "setting up file io: mode %s, count %d, read_once %d, write_immediately %d\n", | |
948 | (read) ? "read" : "write", count, q->fileio_read_once, | |
949 | q->fileio_write_immediately); | |
950 | ||
951 | fileio = kzalloc(sizeof(struct vb2_fileio_data), GFP_KERNEL); | |
952 | if (fileio == NULL) | |
953 | return -ENOMEM; | |
954 | ||
955 | fileio->read_once = q->fileio_read_once; | |
956 | fileio->write_immediately = q->fileio_write_immediately; | |
957 | ||
958 | /* | |
959 | * Request buffers and use MMAP type to force driver | |
960 | * to allocate buffers by itself. | |
961 | */ | |
962 | fileio->req.count = count; | |
963 | fileio->req.memory = VB2_MEMORY_MMAP; | |
964 | fileio->req.type = q->type; | |
965 | q->fileio = fileio; | |
966 | ret = vb2_core_reqbufs(q, fileio->req.memory, &fileio->req.count); | |
967 | if (ret) | |
968 | goto err_kfree; | |
969 | ||
970 | /* | |
971 | * Check if plane_count is correct | |
972 | * (multiplane buffers are not supported). | |
973 | */ | |
974 | if (q->bufs[0]->num_planes != 1) { | |
975 | ret = -EBUSY; | |
976 | goto err_reqbufs; | |
977 | } | |
978 | ||
979 | /* | |
980 | * Get kernel address of each buffer. | |
981 | */ | |
982 | for (i = 0; i < q->num_buffers; i++) { | |
983 | fileio->bufs[i].vaddr = vb2_plane_vaddr(q->bufs[i], 0); | |
984 | if (fileio->bufs[i].vaddr == NULL) { | |
985 | ret = -EINVAL; | |
986 | goto err_reqbufs; | |
987 | } | |
988 | fileio->bufs[i].size = vb2_plane_size(q->bufs[i], 0); | |
989 | } | |
990 | ||
991 | /* | |
992 | * Read mode requires pre queuing of all buffers. | |
993 | */ | |
994 | if (read) { | |
995 | bool is_multiplanar = q->is_multiplanar; | |
996 | ||
997 | /* | |
998 | * Queue all buffers. | |
999 | */ | |
1000 | for (i = 0; i < q->num_buffers; i++) { | |
1001 | struct v4l2_buffer *b = &fileio->b; | |
1002 | ||
1003 | memset(b, 0, sizeof(*b)); | |
1004 | b->type = q->type; | |
1005 | if (is_multiplanar) { | |
1006 | memset(&fileio->p, 0, sizeof(fileio->p)); | |
1007 | b->m.planes = &fileio->p; | |
1008 | b->length = 1; | |
1009 | } | |
1010 | b->memory = q->memory; | |
1011 | b->index = i; | |
1012 | ret = vb2_internal_qbuf(q, b); | |
1013 | if (ret) | |
1014 | goto err_reqbufs; | |
1015 | fileio->bufs[i].queued = 1; | |
1016 | } | |
1017 | /* | |
1018 | * All buffers have been queued, so mark that by setting | |
1019 | * initial_index to q->num_buffers | |
1020 | */ | |
1021 | fileio->initial_index = q->num_buffers; | |
1022 | fileio->cur_index = q->num_buffers; | |
1023 | } | |
1024 | ||
1025 | /* | |
1026 | * Start streaming. | |
1027 | */ | |
1028 | ret = vb2_core_streamon(q, q->type); | |
1029 | if (ret) | |
1030 | goto err_reqbufs; | |
1031 | ||
1032 | return ret; | |
1033 | ||
1034 | err_reqbufs: | |
1035 | fileio->req.count = 0; | |
1036 | vb2_core_reqbufs(q, fileio->req.memory, &fileio->req.count); | |
1037 | ||
1038 | err_kfree: | |
1039 | q->fileio = NULL; | |
1040 | kfree(fileio); | |
1041 | return ret; | |
1042 | } | |
1043 | ||
1044 | /** | |
1045 | * __vb2_cleanup_fileio() - free resourced used by file io emulator | |
1046 | * @q: videobuf2 queue | |
1047 | */ | |
1048 | static int __vb2_cleanup_fileio(struct vb2_queue *q) | |
1049 | { | |
1050 | struct vb2_fileio_data *fileio = q->fileio; | |
1051 | ||
1052 | if (fileio) { | |
1053 | vb2_core_streamoff(q, q->type); | |
1054 | q->fileio = NULL; | |
1055 | fileio->req.count = 0; | |
1056 | vb2_reqbufs(q, &fileio->req); | |
1057 | kfree(fileio); | |
1058 | dprintk(3, "file io emulator closed\n"); | |
1059 | } | |
1060 | return 0; | |
1061 | } | |
1062 | ||
1063 | /** | |
1064 | * __vb2_perform_fileio() - perform a single file io (read or write) operation | |
1065 | * @q: videobuf2 queue | |
1066 | * @data: pointed to target userspace buffer | |
1067 | * @count: number of bytes to read or write | |
1068 | * @ppos: file handle position tracking pointer | |
1069 | * @nonblock: mode selector (1 means blocking calls, 0 means nonblocking) | |
1070 | * @read: access mode selector (1 means read, 0 means write) | |
1071 | */ | |
1072 | static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_t count, | |
1073 | loff_t *ppos, int nonblock, int read) | |
1074 | { | |
1075 | struct vb2_fileio_data *fileio; | |
1076 | struct vb2_fileio_buf *buf; | |
1077 | bool is_multiplanar = q->is_multiplanar; | |
1078 | /* | |
1079 | * When using write() to write data to an output video node the vb2 core | |
1080 | * should set timestamps if V4L2_BUF_FLAG_TIMESTAMP_COPY is set. Nobody | |
1081 | * else is able to provide this information with the write() operation. | |
1082 | */ | |
1083 | bool set_timestamp = !read && | |
1084 | (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == | |
1085 | V4L2_BUF_FLAG_TIMESTAMP_COPY; | |
1086 | int ret, index; | |
1087 | ||
1088 | dprintk(3, "mode %s, offset %ld, count %zd, %sblocking\n", | |
1089 | read ? "read" : "write", (long)*ppos, count, | |
1090 | nonblock ? "non" : ""); | |
1091 | ||
1092 | if (!data) | |
1093 | return -EINVAL; | |
1094 | ||
1095 | /* | |
1096 | * Initialize emulator on first call. | |
1097 | */ | |
1098 | if (!vb2_fileio_is_active(q)) { | |
1099 | ret = __vb2_init_fileio(q, read); | |
1100 | dprintk(3, "vb2_init_fileio result: %d\n", ret); | |
1101 | if (ret) | |
1102 | return ret; | |
1103 | } | |
1104 | fileio = q->fileio; | |
1105 | ||
1106 | /* | |
1107 | * Check if we need to dequeue the buffer. | |
1108 | */ | |
1109 | index = fileio->cur_index; | |
1110 | if (index >= q->num_buffers) { | |
1111 | /* | |
1112 | * Call vb2_dqbuf to get buffer back. | |
1113 | */ | |
1114 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
1115 | fileio->b.type = q->type; | |
1116 | fileio->b.memory = q->memory; | |
1117 | if (is_multiplanar) { | |
1118 | memset(&fileio->p, 0, sizeof(fileio->p)); | |
1119 | fileio->b.m.planes = &fileio->p; | |
1120 | fileio->b.length = 1; | |
1121 | } | |
1122 | ret = vb2_internal_dqbuf(q, &fileio->b, nonblock); | |
1123 | dprintk(5, "vb2_dqbuf result: %d\n", ret); | |
1124 | if (ret) | |
1125 | return ret; | |
1126 | fileio->dq_count += 1; | |
1127 | ||
1128 | fileio->cur_index = index = fileio->b.index; | |
1129 | buf = &fileio->bufs[index]; | |
1130 | ||
1131 | /* | |
1132 | * Get number of bytes filled by the driver | |
1133 | */ | |
1134 | buf->pos = 0; | |
1135 | buf->queued = 0; | |
1136 | buf->size = read ? vb2_get_plane_payload(q->bufs[index], 0) | |
1137 | : vb2_plane_size(q->bufs[index], 0); | |
1138 | /* Compensate for data_offset on read in the multiplanar case. */ | |
1139 | if (is_multiplanar && read && | |
1140 | fileio->b.m.planes[0].data_offset < buf->size) { | |
1141 | buf->pos = fileio->b.m.planes[0].data_offset; | |
1142 | buf->size -= buf->pos; | |
1143 | } | |
1144 | } else { | |
1145 | buf = &fileio->bufs[index]; | |
1146 | } | |
1147 | ||
1148 | /* | |
1149 | * Limit count on last few bytes of the buffer. | |
1150 | */ | |
1151 | if (buf->pos + count > buf->size) { | |
1152 | count = buf->size - buf->pos; | |
1153 | dprintk(5, "reducing read count: %zd\n", count); | |
1154 | } | |
1155 | ||
1156 | /* | |
1157 | * Transfer data to userspace. | |
1158 | */ | |
1159 | dprintk(3, "copying %zd bytes - buffer %d, offset %u\n", | |
1160 | count, index, buf->pos); | |
1161 | if (read) | |
1162 | ret = copy_to_user(data, buf->vaddr + buf->pos, count); | |
1163 | else | |
1164 | ret = copy_from_user(buf->vaddr + buf->pos, data, count); | |
1165 | if (ret) { | |
1166 | dprintk(3, "error copying data\n"); | |
1167 | return -EFAULT; | |
1168 | } | |
1169 | ||
1170 | /* | |
1171 | * Update counters. | |
1172 | */ | |
1173 | buf->pos += count; | |
1174 | *ppos += count; | |
1175 | ||
1176 | /* | |
1177 | * Queue next buffer if required. | |
1178 | */ | |
1179 | if (buf->pos == buf->size || (!read && fileio->write_immediately)) { | |
1180 | /* | |
1181 | * Check if this is the last buffer to read. | |
1182 | */ | |
1183 | if (read && fileio->read_once && fileio->dq_count == 1) { | |
1184 | dprintk(3, "read limit reached\n"); | |
1185 | return __vb2_cleanup_fileio(q); | |
1186 | } | |
1187 | ||
1188 | /* | |
1189 | * Call vb2_qbuf and give buffer to the driver. | |
1190 | */ | |
1191 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
1192 | fileio->b.type = q->type; | |
1193 | fileio->b.memory = q->memory; | |
1194 | fileio->b.index = index; | |
1195 | fileio->b.bytesused = buf->pos; | |
1196 | if (is_multiplanar) { | |
1197 | memset(&fileio->p, 0, sizeof(fileio->p)); | |
1198 | fileio->p.bytesused = buf->pos; | |
1199 | fileio->b.m.planes = &fileio->p; | |
1200 | fileio->b.length = 1; | |
1201 | } | |
1202 | if (set_timestamp) | |
1203 | v4l2_get_timestamp(&fileio->b.timestamp); | |
1204 | ret = vb2_internal_qbuf(q, &fileio->b); | |
1205 | dprintk(5, "vb2_dbuf result: %d\n", ret); | |
1206 | if (ret) | |
1207 | return ret; | |
1208 | ||
1209 | /* | |
1210 | * Buffer has been queued, update the status | |
1211 | */ | |
1212 | buf->pos = 0; | |
1213 | buf->queued = 1; | |
1214 | buf->size = vb2_plane_size(q->bufs[index], 0); | |
1215 | fileio->q_count += 1; | |
1216 | /* | |
1217 | * If we are queuing up buffers for the first time, then | |
1218 | * increase initial_index by one. | |
1219 | */ | |
1220 | if (fileio->initial_index < q->num_buffers) | |
1221 | fileio->initial_index++; | |
1222 | /* | |
1223 | * The next buffer to use is either a buffer that's going to be | |
1224 | * queued for the first time (initial_index < q->num_buffers) | |
1225 | * or it is equal to q->num_buffers, meaning that the next | |
1226 | * time we need to dequeue a buffer since we've now queued up | |
1227 | * all the 'first time' buffers. | |
1228 | */ | |
1229 | fileio->cur_index = fileio->initial_index; | |
1230 | } | |
1231 | ||
1232 | /* | |
1233 | * Return proper number of bytes processed. | |
1234 | */ | |
1235 | if (ret == 0) | |
1236 | ret = count; | |
1237 | return ret; | |
1238 | } | |
1239 | ||
1240 | size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count, | |
1241 | loff_t *ppos, int nonblocking) | |
1242 | { | |
1243 | return __vb2_perform_fileio(q, data, count, ppos, nonblocking, 1); | |
1244 | } | |
1245 | EXPORT_SYMBOL_GPL(vb2_read); | |
1246 | ||
1247 | size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count, | |
1248 | loff_t *ppos, int nonblocking) | |
1249 | { | |
1250 | return __vb2_perform_fileio(q, (char __user *) data, count, | |
1251 | ppos, nonblocking, 0); | |
1252 | } | |
1253 | EXPORT_SYMBOL_GPL(vb2_write); | |
1254 | ||
1255 | struct vb2_threadio_data { | |
1256 | struct task_struct *thread; | |
1257 | vb2_thread_fnc fnc; | |
1258 | void *priv; | |
1259 | bool stop; | |
1260 | }; | |
1261 | ||
1262 | static int vb2_thread(void *data) | |
1263 | { | |
1264 | struct vb2_queue *q = data; | |
1265 | struct vb2_threadio_data *threadio = q->threadio; | |
1266 | struct vb2_fileio_data *fileio = q->fileio; | |
1267 | bool set_timestamp = false; | |
1268 | int prequeue = 0; | |
1269 | int index = 0; | |
1270 | int ret = 0; | |
1271 | ||
1272 | if (q->is_output) { | |
1273 | prequeue = q->num_buffers; | |
1274 | set_timestamp = | |
1275 | (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == | |
1276 | V4L2_BUF_FLAG_TIMESTAMP_COPY; | |
1277 | } | |
1278 | ||
1279 | set_freezable(); | |
1280 | ||
1281 | for (;;) { | |
1282 | struct vb2_buffer *vb; | |
1283 | ||
1284 | /* | |
1285 | * Call vb2_dqbuf to get buffer back. | |
1286 | */ | |
1287 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
1288 | fileio->b.type = q->type; | |
1289 | fileio->b.memory = q->memory; | |
1290 | if (prequeue) { | |
1291 | fileio->b.index = index++; | |
1292 | prequeue--; | |
1293 | } else { | |
1294 | call_void_qop(q, wait_finish, q); | |
1295 | if (!threadio->stop) | |
1296 | ret = vb2_internal_dqbuf(q, &fileio->b, 0); | |
1297 | call_void_qop(q, wait_prepare, q); | |
1298 | dprintk(5, "file io: vb2_dqbuf result: %d\n", ret); | |
1299 | } | |
1300 | if (ret || threadio->stop) | |
1301 | break; | |
1302 | try_to_freeze(); | |
1303 | ||
1304 | vb = q->bufs[fileio->b.index]; | |
1305 | if (!(fileio->b.flags & V4L2_BUF_FLAG_ERROR)) | |
1306 | if (threadio->fnc(vb, threadio->priv)) | |
1307 | break; | |
1308 | call_void_qop(q, wait_finish, q); | |
1309 | if (set_timestamp) | |
1310 | v4l2_get_timestamp(&fileio->b.timestamp); | |
1311 | if (!threadio->stop) | |
1312 | ret = vb2_internal_qbuf(q, &fileio->b); | |
1313 | call_void_qop(q, wait_prepare, q); | |
1314 | if (ret || threadio->stop) | |
1315 | break; | |
1316 | } | |
1317 | ||
1318 | /* Hmm, linux becomes *very* unhappy without this ... */ | |
1319 | while (!kthread_should_stop()) { | |
1320 | set_current_state(TASK_INTERRUPTIBLE); | |
1321 | schedule(); | |
1322 | } | |
1323 | return 0; | |
1324 | } | |
1325 | ||
1326 | /* | |
1327 | * This function should not be used for anything else but the videobuf2-dvb | |
1328 | * support. If you think you have another good use-case for this, then please | |
1329 | * contact the linux-media mailinglist first. | |
1330 | */ | |
1331 | int vb2_thread_start(struct vb2_queue *q, vb2_thread_fnc fnc, void *priv, | |
1332 | const char *thread_name) | |
1333 | { | |
1334 | struct vb2_threadio_data *threadio; | |
1335 | int ret = 0; | |
1336 | ||
1337 | if (q->threadio) | |
1338 | return -EBUSY; | |
1339 | if (vb2_is_busy(q)) | |
1340 | return -EBUSY; | |
1341 | if (WARN_ON(q->fileio)) | |
1342 | return -EBUSY; | |
1343 | ||
1344 | threadio = kzalloc(sizeof(*threadio), GFP_KERNEL); | |
1345 | if (threadio == NULL) | |
1346 | return -ENOMEM; | |
1347 | threadio->fnc = fnc; | |
1348 | threadio->priv = priv; | |
1349 | ||
1350 | ret = __vb2_init_fileio(q, !q->is_output); | |
1351 | dprintk(3, "file io: vb2_init_fileio result: %d\n", ret); | |
1352 | if (ret) | |
1353 | goto nomem; | |
1354 | q->threadio = threadio; | |
1355 | threadio->thread = kthread_run(vb2_thread, q, "vb2-%s", thread_name); | |
1356 | if (IS_ERR(threadio->thread)) { | |
1357 | ret = PTR_ERR(threadio->thread); | |
1358 | threadio->thread = NULL; | |
1359 | goto nothread; | |
1360 | } | |
1361 | return 0; | |
1362 | ||
1363 | nothread: | |
1364 | __vb2_cleanup_fileio(q); | |
1365 | nomem: | |
1366 | kfree(threadio); | |
1367 | return ret; | |
1368 | } | |
1369 | EXPORT_SYMBOL_GPL(vb2_thread_start); | |
1370 | ||
1371 | int vb2_thread_stop(struct vb2_queue *q) | |
1372 | { | |
1373 | struct vb2_threadio_data *threadio = q->threadio; | |
1374 | int err; | |
1375 | ||
1376 | if (threadio == NULL) | |
1377 | return 0; | |
1378 | threadio->stop = true; | |
1379 | /* Wake up all pending sleeps in the thread */ | |
1380 | vb2_queue_error(q); | |
1381 | err = kthread_stop(threadio->thread); | |
1382 | __vb2_cleanup_fileio(q); | |
1383 | threadio->thread = NULL; | |
1384 | kfree(threadio); | |
1385 | q->threadio = NULL; | |
1386 | return err; | |
1387 | } | |
1388 | EXPORT_SYMBOL_GPL(vb2_thread_stop); | |
1389 | ||
1390 | /* | |
1391 | * The following functions are not part of the vb2 core API, but are helper | |
1392 | * functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations | |
1393 | * and struct vb2_ops. | |
1394 | * They contain boilerplate code that most if not all drivers have to do | |
1395 | * and so they simplify the driver code. | |
1396 | */ | |
1397 | ||
1398 | /* The queue is busy if there is a owner and you are not that owner. */ | |
1399 | static inline bool vb2_queue_is_busy(struct video_device *vdev, struct file *file) | |
1400 | { | |
1401 | return vdev->queue->owner && vdev->queue->owner != file->private_data; | |
1402 | } | |
1403 | ||
1404 | /* vb2 ioctl helpers */ | |
1405 | ||
1406 | int vb2_ioctl_reqbufs(struct file *file, void *priv, | |
1407 | struct v4l2_requestbuffers *p) | |
1408 | { | |
1409 | struct video_device *vdev = video_devdata(file); | |
1410 | int res = vb2_verify_memory_type(vdev->queue, p->memory, p->type); | |
1411 | ||
1412 | if (res) | |
1413 | return res; | |
1414 | if (vb2_queue_is_busy(vdev, file)) | |
1415 | return -EBUSY; | |
1416 | res = vb2_core_reqbufs(vdev->queue, p->memory, &p->count); | |
1417 | /* If count == 0, then the owner has released all buffers and he | |
1418 | is no longer owner of the queue. Otherwise we have a new owner. */ | |
1419 | if (res == 0) | |
1420 | vdev->queue->owner = p->count ? file->private_data : NULL; | |
1421 | return res; | |
1422 | } | |
1423 | EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs); | |
1424 | ||
1425 | int vb2_ioctl_create_bufs(struct file *file, void *priv, | |
1426 | struct v4l2_create_buffers *p) | |
1427 | { | |
1428 | struct video_device *vdev = video_devdata(file); | |
1429 | int res = vb2_verify_memory_type(vdev->queue, p->memory, | |
1430 | p->format.type); | |
1431 | ||
1432 | p->index = vdev->queue->num_buffers; | |
1433 | /* | |
1434 | * If count == 0, then just check if memory and type are valid. | |
1435 | * Any -EBUSY result from vb2_verify_memory_type can be mapped to 0. | |
1436 | */ | |
1437 | if (p->count == 0) | |
1438 | return res != -EBUSY ? res : 0; | |
1439 | if (res) | |
1440 | return res; | |
1441 | if (vb2_queue_is_busy(vdev, file)) | |
1442 | return -EBUSY; | |
1443 | res = vb2_core_create_bufs(vdev->queue, p->memory, &p->count, | |
1444 | &p->format); | |
1445 | if (res == 0) | |
1446 | vdev->queue->owner = file->private_data; | |
1447 | return res; | |
1448 | } | |
1449 | EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs); | |
1450 | ||
1451 | int vb2_ioctl_prepare_buf(struct file *file, void *priv, | |
1452 | struct v4l2_buffer *p) | |
1453 | { | |
1454 | struct video_device *vdev = video_devdata(file); | |
1455 | ||
1456 | if (vb2_queue_is_busy(vdev, file)) | |
1457 | return -EBUSY; | |
1458 | return vb2_prepare_buf(vdev->queue, p); | |
1459 | } | |
1460 | EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf); | |
1461 | ||
1462 | int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
1463 | { | |
1464 | struct video_device *vdev = video_devdata(file); | |
1465 | ||
1466 | /* No need to call vb2_queue_is_busy(), anyone can query buffers. */ | |
1467 | return vb2_querybuf(vdev->queue, p); | |
1468 | } | |
1469 | EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf); | |
1470 | ||
1471 | int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
1472 | { | |
1473 | struct video_device *vdev = video_devdata(file); | |
1474 | ||
1475 | if (vb2_queue_is_busy(vdev, file)) | |
1476 | return -EBUSY; | |
1477 | return vb2_qbuf(vdev->queue, p); | |
1478 | } | |
1479 | EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf); | |
1480 | ||
1481 | int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
1482 | { | |
1483 | struct video_device *vdev = video_devdata(file); | |
1484 | ||
1485 | if (vb2_queue_is_busy(vdev, file)) | |
1486 | return -EBUSY; | |
1487 | return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK); | |
1488 | } | |
1489 | EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf); | |
1490 | ||
1491 | int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i) | |
1492 | { | |
1493 | struct video_device *vdev = video_devdata(file); | |
1494 | ||
1495 | if (vb2_queue_is_busy(vdev, file)) | |
1496 | return -EBUSY; | |
1497 | return vb2_streamon(vdev->queue, i); | |
1498 | } | |
1499 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamon); | |
1500 | ||
1501 | int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i) | |
1502 | { | |
1503 | struct video_device *vdev = video_devdata(file); | |
1504 | ||
1505 | if (vb2_queue_is_busy(vdev, file)) | |
1506 | return -EBUSY; | |
1507 | return vb2_streamoff(vdev->queue, i); | |
1508 | } | |
1509 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff); | |
1510 | ||
1511 | int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p) | |
1512 | { | |
1513 | struct video_device *vdev = video_devdata(file); | |
1514 | ||
1515 | if (vb2_queue_is_busy(vdev, file)) | |
1516 | return -EBUSY; | |
1517 | return vb2_expbuf(vdev->queue, p); | |
1518 | } | |
1519 | EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf); | |
1520 | ||
1521 | /* v4l2_file_operations helpers */ | |
1522 | ||
1523 | int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma) | |
1524 | { | |
1525 | struct video_device *vdev = video_devdata(file); | |
1526 | ||
1527 | return vb2_mmap(vdev->queue, vma); | |
1528 | } | |
1529 | EXPORT_SYMBOL_GPL(vb2_fop_mmap); | |
1530 | ||
1531 | int _vb2_fop_release(struct file *file, struct mutex *lock) | |
1532 | { | |
1533 | struct video_device *vdev = video_devdata(file); | |
1534 | ||
1535 | if (lock) | |
1536 | mutex_lock(lock); | |
1537 | if (file->private_data == vdev->queue->owner) { | |
1538 | vb2_queue_release(vdev->queue); | |
1539 | vdev->queue->owner = NULL; | |
1540 | } | |
1541 | if (lock) | |
1542 | mutex_unlock(lock); | |
1543 | return v4l2_fh_release(file); | |
1544 | } | |
1545 | EXPORT_SYMBOL_GPL(_vb2_fop_release); | |
1546 | ||
1547 | int vb2_fop_release(struct file *file) | |
1548 | { | |
1549 | struct video_device *vdev = video_devdata(file); | |
1550 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
1551 | ||
1552 | return _vb2_fop_release(file, lock); | |
1553 | } | |
1554 | EXPORT_SYMBOL_GPL(vb2_fop_release); | |
1555 | ||
1556 | ssize_t vb2_fop_write(struct file *file, const char __user *buf, | |
1557 | size_t count, loff_t *ppos) | |
1558 | { | |
1559 | struct video_device *vdev = video_devdata(file); | |
1560 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
1561 | int err = -EBUSY; | |
1562 | ||
1563 | if (!(vdev->queue->io_modes & VB2_WRITE)) | |
1564 | return -EINVAL; | |
1565 | if (lock && mutex_lock_interruptible(lock)) | |
1566 | return -ERESTARTSYS; | |
1567 | if (vb2_queue_is_busy(vdev, file)) | |
1568 | goto exit; | |
1569 | err = vb2_write(vdev->queue, buf, count, ppos, | |
1570 | file->f_flags & O_NONBLOCK); | |
1571 | if (vdev->queue->fileio) | |
1572 | vdev->queue->owner = file->private_data; | |
1573 | exit: | |
1574 | if (lock) | |
1575 | mutex_unlock(lock); | |
1576 | return err; | |
1577 | } | |
1578 | EXPORT_SYMBOL_GPL(vb2_fop_write); | |
1579 | ||
1580 | ssize_t vb2_fop_read(struct file *file, char __user *buf, | |
1581 | size_t count, loff_t *ppos) | |
1582 | { | |
1583 | struct video_device *vdev = video_devdata(file); | |
1584 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
1585 | int err = -EBUSY; | |
1586 | ||
1587 | if (!(vdev->queue->io_modes & VB2_READ)) | |
1588 | return -EINVAL; | |
1589 | if (lock && mutex_lock_interruptible(lock)) | |
1590 | return -ERESTARTSYS; | |
1591 | if (vb2_queue_is_busy(vdev, file)) | |
1592 | goto exit; | |
1593 | err = vb2_read(vdev->queue, buf, count, ppos, | |
1594 | file->f_flags & O_NONBLOCK); | |
1595 | if (vdev->queue->fileio) | |
1596 | vdev->queue->owner = file->private_data; | |
1597 | exit: | |
1598 | if (lock) | |
1599 | mutex_unlock(lock); | |
1600 | return err; | |
1601 | } | |
1602 | EXPORT_SYMBOL_GPL(vb2_fop_read); | |
1603 | ||
1604 | unsigned int vb2_fop_poll(struct file *file, poll_table *wait) | |
1605 | { | |
1606 | struct video_device *vdev = video_devdata(file); | |
1607 | struct vb2_queue *q = vdev->queue; | |
1608 | struct mutex *lock = q->lock ? q->lock : vdev->lock; | |
1609 | unsigned res; | |
1610 | void *fileio; | |
1611 | ||
1612 | /* | |
1613 | * If this helper doesn't know how to lock, then you shouldn't be using | |
1614 | * it but you should write your own. | |
1615 | */ | |
1616 | WARN_ON(!lock); | |
1617 | ||
1618 | if (lock && mutex_lock_interruptible(lock)) | |
1619 | return POLLERR; | |
1620 | ||
1621 | fileio = q->fileio; | |
1622 | ||
1623 | res = vb2_poll(vdev->queue, file, wait); | |
1624 | ||
1625 | /* If fileio was started, then we have a new queue owner. */ | |
1626 | if (!fileio && q->fileio) | |
1627 | q->owner = file->private_data; | |
1628 | if (lock) | |
1629 | mutex_unlock(lock); | |
1630 | return res; | |
1631 | } | |
1632 | EXPORT_SYMBOL_GPL(vb2_fop_poll); | |
1633 | ||
1634 | #ifndef CONFIG_MMU | |
1635 | unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr, | |
1636 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
1637 | { | |
1638 | struct video_device *vdev = video_devdata(file); | |
1639 | ||
1640 | return vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags); | |
1641 | } | |
1642 | EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area); | |
1643 | #endif | |
1644 | ||
1645 | /* vb2_ops helpers. Only use if vq->lock is non-NULL. */ | |
1646 | ||
1647 | void vb2_ops_wait_prepare(struct vb2_queue *vq) | |
1648 | { | |
1649 | mutex_unlock(vq->lock); | |
1650 | } | |
1651 | EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare); | |
1652 | ||
1653 | void vb2_ops_wait_finish(struct vb2_queue *vq) | |
1654 | { | |
1655 | mutex_lock(vq->lock); | |
1656 | } | |
1657 | EXPORT_SYMBOL_GPL(vb2_ops_wait_finish); | |
1658 | ||
c139990e JS |
1659 | MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2"); |
1660 | MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski"); | |
1661 | MODULE_LICENSE("GPL"); |