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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? */ | |
e88a3f81 | 55 | if (b->m.planes == NULL) { |
3c5be988 JS |
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) | |
d6dd645e | 123 | vb->timestamp = timeval_to_ns(&b->timestamp); |
3c5be988 JS |
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; | |
d6dd645e | 194 | b->timestamp = ns_to_timeval(vb->timestamp); |
3c5be988 JS |
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 | } | |
d6dd645e | 311 | vb->timestamp = 0; |
3c5be988 JS |
312 | vbuf->sequence = 0; |
313 | ||
314 | if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { | |
315 | if (b->memory == VB2_MEMORY_USERPTR) { | |
316 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
317 | planes[plane].m.userptr = | |
318 | b->m.planes[plane].m.userptr; | |
319 | planes[plane].length = | |
320 | b->m.planes[plane].length; | |
321 | } | |
322 | } | |
323 | if (b->memory == VB2_MEMORY_DMABUF) { | |
324 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
325 | planes[plane].m.fd = | |
326 | b->m.planes[plane].m.fd; | |
327 | planes[plane].length = | |
328 | b->m.planes[plane].length; | |
329 | } | |
330 | } | |
331 | ||
332 | /* Fill in driver-provided information for OUTPUT types */ | |
333 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { | |
334 | /* | |
335 | * Will have to go up to b->length when API starts | |
336 | * accepting variable number of planes. | |
337 | * | |
338 | * If bytesused == 0 for the output buffer, then fall | |
339 | * back to the full buffer size. In that case | |
340 | * userspace clearly never bothered to set it and | |
341 | * it's a safe assumption that they really meant to | |
342 | * use the full plane sizes. | |
343 | * | |
344 | * Some drivers, e.g. old codec drivers, use bytesused == 0 | |
345 | * as a way to indicate that streaming is finished. | |
346 | * In that case, the driver should use the | |
347 | * allow_zero_bytesused flag to keep old userspace | |
348 | * applications working. | |
349 | */ | |
350 | for (plane = 0; plane < vb->num_planes; ++plane) { | |
351 | struct vb2_plane *pdst = &planes[plane]; | |
352 | struct v4l2_plane *psrc = &b->m.planes[plane]; | |
353 | ||
354 | if (psrc->bytesused == 0) | |
355 | vb2_warn_zero_bytesused(vb); | |
356 | ||
357 | if (vb->vb2_queue->allow_zero_bytesused) | |
358 | pdst->bytesused = psrc->bytesused; | |
359 | else | |
360 | pdst->bytesused = psrc->bytesused ? | |
361 | psrc->bytesused : pdst->length; | |
362 | pdst->data_offset = psrc->data_offset; | |
363 | } | |
364 | } | |
365 | } else { | |
366 | /* | |
367 | * Single-planar buffers do not use planes array, | |
368 | * so fill in relevant v4l2_buffer struct fields instead. | |
369 | * In videobuf we use our internal V4l2_planes struct for | |
370 | * single-planar buffers as well, for simplicity. | |
371 | * | |
372 | * If bytesused == 0 for the output buffer, then fall back | |
373 | * to the full buffer size as that's a sensible default. | |
374 | * | |
375 | * Some drivers, e.g. old codec drivers, use bytesused == 0 as | |
376 | * a way to indicate that streaming is finished. In that case, | |
377 | * the driver should use the allow_zero_bytesused flag to keep | |
378 | * old userspace applications working. | |
379 | */ | |
380 | if (b->memory == VB2_MEMORY_USERPTR) { | |
381 | planes[0].m.userptr = b->m.userptr; | |
382 | planes[0].length = b->length; | |
383 | } | |
384 | ||
385 | if (b->memory == VB2_MEMORY_DMABUF) { | |
386 | planes[0].m.fd = b->m.fd; | |
387 | planes[0].length = b->length; | |
388 | } | |
389 | ||
390 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { | |
391 | if (b->bytesused == 0) | |
392 | vb2_warn_zero_bytesused(vb); | |
393 | ||
394 | if (vb->vb2_queue->allow_zero_bytesused) | |
395 | planes[0].bytesused = b->bytesused; | |
396 | else | |
397 | planes[0].bytesused = b->bytesused ? | |
398 | b->bytesused : planes[0].length; | |
399 | } else | |
400 | planes[0].bytesused = 0; | |
401 | ||
402 | } | |
403 | ||
404 | /* Zero flags that the vb2 core handles */ | |
405 | vbuf->flags = b->flags & ~V4L2_BUFFER_MASK_FLAGS; | |
406 | if ((vb->vb2_queue->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) != | |
407 | V4L2_BUF_FLAG_TIMESTAMP_COPY || !V4L2_TYPE_IS_OUTPUT(b->type)) { | |
408 | /* | |
409 | * Non-COPY timestamps and non-OUTPUT queues will get | |
410 | * their timestamp and timestamp source flags from the | |
411 | * queue. | |
412 | */ | |
413 | vbuf->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; | |
414 | } | |
415 | ||
416 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { | |
417 | /* | |
418 | * For output buffers mask out the timecode flag: | |
419 | * this will be handled later in vb2_internal_qbuf(). | |
420 | * The 'field' is valid metadata for this output buffer | |
421 | * and so that needs to be copied here. | |
422 | */ | |
423 | vbuf->flags &= ~V4L2_BUF_FLAG_TIMECODE; | |
424 | vbuf->field = b->field; | |
425 | } else { | |
426 | /* Zero any output buffer flags as this is a capture buffer */ | |
427 | vbuf->flags &= ~V4L2_BUFFER_OUT_FLAGS; | |
428 | } | |
429 | ||
430 | return 0; | |
431 | } | |
432 | ||
433 | static const struct vb2_buf_ops v4l2_buf_ops = { | |
434 | .fill_user_buffer = __fill_v4l2_buffer, | |
435 | .fill_vb2_buffer = __fill_vb2_buffer, | |
436 | .set_timestamp = __set_timestamp, | |
437 | }; | |
438 | ||
439 | /** | |
440 | * vb2_querybuf() - query video buffer information | |
441 | * @q: videobuf queue | |
442 | * @b: buffer struct passed from userspace to vidioc_querybuf handler | |
443 | * in driver | |
444 | * | |
445 | * Should be called from vidioc_querybuf ioctl handler in driver. | |
446 | * This function will verify the passed v4l2_buffer structure and fill the | |
447 | * relevant information for the userspace. | |
448 | * | |
449 | * The return values from this function are intended to be directly returned | |
450 | * from vidioc_querybuf handler in driver. | |
451 | */ | |
452 | int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b) | |
453 | { | |
454 | struct vb2_buffer *vb; | |
455 | int ret; | |
456 | ||
457 | if (b->type != q->type) { | |
458 | dprintk(1, "wrong buffer type\n"); | |
459 | return -EINVAL; | |
460 | } | |
461 | ||
462 | if (b->index >= q->num_buffers) { | |
463 | dprintk(1, "buffer index out of range\n"); | |
464 | return -EINVAL; | |
465 | } | |
466 | vb = q->bufs[b->index]; | |
467 | ret = __verify_planes_array(vb, b); | |
468 | ||
469 | return ret ? ret : vb2_core_querybuf(q, b->index, b); | |
470 | } | |
471 | EXPORT_SYMBOL(vb2_querybuf); | |
472 | ||
473 | /** | |
474 | * vb2_reqbufs() - Wrapper for vb2_core_reqbufs() that also verifies | |
475 | * the memory and type values. | |
476 | * @q: videobuf2 queue | |
477 | * @req: struct passed from userspace to vidioc_reqbufs handler | |
478 | * in driver | |
479 | */ | |
480 | int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) | |
481 | { | |
482 | int ret = vb2_verify_memory_type(q, req->memory, req->type); | |
483 | ||
484 | return ret ? ret : vb2_core_reqbufs(q, req->memory, &req->count); | |
485 | } | |
486 | EXPORT_SYMBOL_GPL(vb2_reqbufs); | |
487 | ||
488 | /** | |
489 | * vb2_prepare_buf() - Pass ownership of a buffer from userspace to the kernel | |
490 | * @q: videobuf2 queue | |
491 | * @b: buffer structure passed from userspace to vidioc_prepare_buf | |
492 | * handler in driver | |
493 | * | |
494 | * Should be called from vidioc_prepare_buf ioctl handler of a driver. | |
495 | * This function: | |
496 | * 1) verifies the passed buffer, | |
497 | * 2) calls buf_prepare callback in the driver (if provided), in which | |
498 | * driver-specific buffer initialization can be performed, | |
499 | * | |
500 | * The return values from this function are intended to be directly returned | |
501 | * from vidioc_prepare_buf handler in driver. | |
502 | */ | |
503 | int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b) | |
504 | { | |
505 | int ret; | |
506 | ||
507 | if (vb2_fileio_is_active(q)) { | |
508 | dprintk(1, "file io in progress\n"); | |
509 | return -EBUSY; | |
510 | } | |
511 | ||
512 | ret = vb2_queue_or_prepare_buf(q, b, "prepare_buf"); | |
513 | ||
514 | return ret ? ret : vb2_core_prepare_buf(q, b->index, b); | |
515 | } | |
516 | EXPORT_SYMBOL_GPL(vb2_prepare_buf); | |
517 | ||
518 | /** | |
519 | * vb2_create_bufs() - Wrapper for vb2_core_create_bufs() that also verifies | |
520 | * the memory and type values. | |
521 | * @q: videobuf2 queue | |
522 | * @create: creation parameters, passed from userspace to vidioc_create_bufs | |
523 | * handler in driver | |
524 | */ | |
525 | int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) | |
526 | { | |
df9ecb0c HV |
527 | unsigned requested_planes = 1; |
528 | unsigned requested_sizes[VIDEO_MAX_PLANES]; | |
529 | struct v4l2_format *f = &create->format; | |
530 | int ret = vb2_verify_memory_type(q, create->memory, f->type); | |
531 | unsigned i; | |
3c5be988 JS |
532 | |
533 | create->index = q->num_buffers; | |
534 | if (create->count == 0) | |
535 | return ret != -EBUSY ? ret : 0; | |
df9ecb0c HV |
536 | |
537 | switch (f->type) { | |
538 | case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE: | |
539 | case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE: | |
540 | requested_planes = f->fmt.pix_mp.num_planes; | |
541 | if (requested_planes == 0 || | |
542 | requested_planes > VIDEO_MAX_PLANES) | |
543 | return -EINVAL; | |
544 | for (i = 0; i < requested_planes; i++) | |
545 | requested_sizes[i] = | |
546 | f->fmt.pix_mp.plane_fmt[i].sizeimage; | |
547 | break; | |
548 | case V4L2_BUF_TYPE_VIDEO_CAPTURE: | |
549 | case V4L2_BUF_TYPE_VIDEO_OUTPUT: | |
550 | requested_sizes[0] = f->fmt.pix.sizeimage; | |
551 | break; | |
552 | case V4L2_BUF_TYPE_VBI_CAPTURE: | |
553 | case V4L2_BUF_TYPE_VBI_OUTPUT: | |
554 | requested_sizes[0] = f->fmt.vbi.samples_per_line * | |
555 | (f->fmt.vbi.count[0] + f->fmt.vbi.count[1]); | |
556 | break; | |
557 | case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE: | |
558 | case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT: | |
559 | requested_sizes[0] = f->fmt.sliced.io_size; | |
560 | break; | |
561 | case V4L2_BUF_TYPE_SDR_CAPTURE: | |
562 | case V4L2_BUF_TYPE_SDR_OUTPUT: | |
563 | requested_sizes[0] = f->fmt.sdr.buffersize; | |
564 | break; | |
565 | default: | |
566 | return -EINVAL; | |
567 | } | |
568 | for (i = 0; i < requested_planes; i++) | |
569 | if (requested_sizes[i] == 0) | |
570 | return -EINVAL; | |
3c5be988 | 571 | return ret ? ret : vb2_core_create_bufs(q, create->memory, |
df9ecb0c | 572 | &create->count, requested_planes, requested_sizes); |
3c5be988 JS |
573 | } |
574 | EXPORT_SYMBOL_GPL(vb2_create_bufs); | |
575 | ||
576 | static int vb2_internal_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) | |
577 | { | |
578 | int ret = vb2_queue_or_prepare_buf(q, b, "qbuf"); | |
579 | ||
580 | return ret ? ret : vb2_core_qbuf(q, b->index, b); | |
581 | } | |
582 | ||
583 | /** | |
584 | * vb2_qbuf() - Queue a buffer from userspace | |
585 | * @q: videobuf2 queue | |
586 | * @b: buffer structure passed from userspace to vidioc_qbuf handler | |
587 | * in driver | |
588 | * | |
589 | * Should be called from vidioc_qbuf ioctl handler of a driver. | |
590 | * This function: | |
591 | * 1) verifies the passed buffer, | |
592 | * 2) if necessary, calls buf_prepare callback in the driver (if provided), in | |
593 | * which driver-specific buffer initialization can be performed, | |
594 | * 3) if streaming is on, queues the buffer in driver by the means of buf_queue | |
595 | * callback for processing. | |
596 | * | |
597 | * The return values from this function are intended to be directly returned | |
598 | * from vidioc_qbuf handler in driver. | |
599 | */ | |
600 | int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) | |
601 | { | |
602 | if (vb2_fileio_is_active(q)) { | |
603 | dprintk(1, "file io in progress\n"); | |
604 | return -EBUSY; | |
605 | } | |
606 | ||
607 | return vb2_internal_qbuf(q, b); | |
608 | } | |
609 | EXPORT_SYMBOL_GPL(vb2_qbuf); | |
610 | ||
611 | static int vb2_internal_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, | |
612 | bool nonblocking) | |
613 | { | |
614 | int ret; | |
615 | ||
616 | if (b->type != q->type) { | |
617 | dprintk(1, "invalid buffer type\n"); | |
618 | return -EINVAL; | |
619 | } | |
620 | ||
621 | ret = vb2_core_dqbuf(q, b, nonblocking); | |
622 | ||
623 | if (!ret && !q->is_output && | |
624 | b->flags & V4L2_BUF_FLAG_LAST) | |
625 | q->last_buffer_dequeued = true; | |
626 | ||
627 | return ret; | |
628 | } | |
629 | ||
630 | /** | |
631 | * vb2_dqbuf() - Dequeue a buffer to the userspace | |
632 | * @q: videobuf2 queue | |
633 | * @b: buffer structure passed from userspace to vidioc_dqbuf handler | |
634 | * in driver | |
635 | * @nonblocking: if true, this call will not sleep waiting for a buffer if no | |
636 | * buffers ready for dequeuing are present. Normally the driver | |
637 | * would be passing (file->f_flags & O_NONBLOCK) here | |
638 | * | |
639 | * Should be called from vidioc_dqbuf ioctl handler of a driver. | |
640 | * This function: | |
641 | * 1) verifies the passed buffer, | |
642 | * 2) calls buf_finish callback in the driver (if provided), in which | |
643 | * driver can perform any additional operations that may be required before | |
644 | * returning the buffer to userspace, such as cache sync, | |
645 | * 3) the buffer struct members are filled with relevant information for | |
646 | * the userspace. | |
647 | * | |
648 | * The return values from this function are intended to be directly returned | |
649 | * from vidioc_dqbuf handler in driver. | |
650 | */ | |
651 | int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) | |
652 | { | |
653 | if (vb2_fileio_is_active(q)) { | |
654 | dprintk(1, "file io in progress\n"); | |
655 | return -EBUSY; | |
656 | } | |
657 | return vb2_internal_dqbuf(q, b, nonblocking); | |
658 | } | |
659 | EXPORT_SYMBOL_GPL(vb2_dqbuf); | |
660 | ||
661 | /** | |
662 | * vb2_streamon - start streaming | |
663 | * @q: videobuf2 queue | |
664 | * @type: type argument passed from userspace to vidioc_streamon handler | |
665 | * | |
666 | * Should be called from vidioc_streamon handler of a driver. | |
667 | * This function: | |
668 | * 1) verifies current state | |
669 | * 2) passes any previously queued buffers to the driver and starts streaming | |
670 | * | |
671 | * The return values from this function are intended to be directly returned | |
672 | * from vidioc_streamon handler in the driver. | |
673 | */ | |
674 | int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type) | |
675 | { | |
676 | if (vb2_fileio_is_active(q)) { | |
677 | dprintk(1, "file io in progress\n"); | |
678 | return -EBUSY; | |
679 | } | |
680 | return vb2_core_streamon(q, type); | |
681 | } | |
682 | EXPORT_SYMBOL_GPL(vb2_streamon); | |
683 | ||
684 | /** | |
685 | * vb2_streamoff - stop streaming | |
686 | * @q: videobuf2 queue | |
687 | * @type: type argument passed from userspace to vidioc_streamoff handler | |
688 | * | |
689 | * Should be called from vidioc_streamoff handler of a driver. | |
690 | * This function: | |
691 | * 1) verifies current state, | |
692 | * 2) stop streaming and dequeues any queued buffers, including those previously | |
693 | * passed to the driver (after waiting for the driver to finish). | |
694 | * | |
695 | * This call can be used for pausing playback. | |
696 | * The return values from this function are intended to be directly returned | |
697 | * from vidioc_streamoff handler in the driver | |
698 | */ | |
699 | int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) | |
700 | { | |
701 | if (vb2_fileio_is_active(q)) { | |
702 | dprintk(1, "file io in progress\n"); | |
703 | return -EBUSY; | |
704 | } | |
705 | return vb2_core_streamoff(q, type); | |
706 | } | |
707 | EXPORT_SYMBOL_GPL(vb2_streamoff); | |
708 | ||
709 | /** | |
710 | * vb2_expbuf() - Export a buffer as a file descriptor | |
711 | * @q: videobuf2 queue | |
712 | * @eb: export buffer structure passed from userspace to vidioc_expbuf | |
713 | * handler in driver | |
714 | * | |
715 | * The return values from this function are intended to be directly returned | |
716 | * from vidioc_expbuf handler in driver. | |
717 | */ | |
718 | int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb) | |
719 | { | |
720 | return vb2_core_expbuf(q, &eb->fd, eb->type, eb->index, | |
721 | eb->plane, eb->flags); | |
722 | } | |
723 | EXPORT_SYMBOL_GPL(vb2_expbuf); | |
724 | ||
725 | /** | |
726 | * vb2_queue_init() - initialize a videobuf2 queue | |
727 | * @q: videobuf2 queue; this structure should be allocated in driver | |
728 | * | |
729 | * The vb2_queue structure should be allocated by the driver. The driver is | |
730 | * responsible of clearing it's content and setting initial values for some | |
731 | * required entries before calling this function. | |
732 | * q->ops, q->mem_ops, q->type and q->io_modes are mandatory. Please refer | |
733 | * to the struct vb2_queue description in include/media/videobuf2-core.h | |
734 | * for more information. | |
735 | */ | |
736 | int vb2_queue_init(struct vb2_queue *q) | |
737 | { | |
738 | /* | |
739 | * Sanity check | |
740 | */ | |
741 | if (WARN_ON(!q) || | |
742 | WARN_ON(q->timestamp_flags & | |
743 | ~(V4L2_BUF_FLAG_TIMESTAMP_MASK | | |
744 | V4L2_BUF_FLAG_TSTAMP_SRC_MASK))) | |
745 | return -EINVAL; | |
746 | ||
747 | /* Warn that the driver should choose an appropriate timestamp type */ | |
748 | WARN_ON((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == | |
749 | V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN); | |
750 | ||
751 | /* Warn that vb2_memory should match with v4l2_memory */ | |
752 | if (WARN_ON(VB2_MEMORY_MMAP != (int)V4L2_MEMORY_MMAP) | |
753 | || WARN_ON(VB2_MEMORY_USERPTR != (int)V4L2_MEMORY_USERPTR) | |
754 | || WARN_ON(VB2_MEMORY_DMABUF != (int)V4L2_MEMORY_DMABUF)) | |
755 | return -EINVAL; | |
756 | ||
757 | if (q->buf_struct_size == 0) | |
758 | q->buf_struct_size = sizeof(struct vb2_v4l2_buffer); | |
759 | ||
760 | q->buf_ops = &v4l2_buf_ops; | |
761 | q->is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type); | |
762 | q->is_output = V4L2_TYPE_IS_OUTPUT(q->type); | |
763 | ||
764 | return vb2_core_queue_init(q); | |
765 | } | |
766 | EXPORT_SYMBOL_GPL(vb2_queue_init); | |
767 | ||
768 | static int __vb2_init_fileio(struct vb2_queue *q, int read); | |
769 | static int __vb2_cleanup_fileio(struct vb2_queue *q); | |
770 | ||
771 | /** | |
772 | * vb2_queue_release() - stop streaming, release the queue and free memory | |
773 | * @q: videobuf2 queue | |
774 | * | |
775 | * This function stops streaming and performs necessary clean ups, including | |
776 | * freeing video buffer memory. The driver is responsible for freeing | |
777 | * the vb2_queue structure itself. | |
778 | */ | |
779 | void vb2_queue_release(struct vb2_queue *q) | |
780 | { | |
781 | __vb2_cleanup_fileio(q); | |
782 | vb2_core_queue_release(q); | |
783 | } | |
784 | EXPORT_SYMBOL_GPL(vb2_queue_release); | |
785 | ||
786 | /** | |
787 | * vb2_poll() - implements poll userspace operation | |
788 | * @q: videobuf2 queue | |
789 | * @file: file argument passed to the poll file operation handler | |
790 | * @wait: wait argument passed to the poll file operation handler | |
791 | * | |
792 | * This function implements poll file operation handler for a driver. | |
793 | * For CAPTURE queues, if a buffer is ready to be dequeued, the userspace will | |
794 | * be informed that the file descriptor of a video device is available for | |
795 | * reading. | |
796 | * For OUTPUT queues, if a buffer is ready to be dequeued, the file descriptor | |
797 | * will be reported as available for writing. | |
798 | * | |
799 | * If the driver uses struct v4l2_fh, then vb2_poll() will also check for any | |
800 | * pending events. | |
801 | * | |
802 | * The return values from this function are intended to be directly returned | |
803 | * from poll handler in driver. | |
804 | */ | |
805 | unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) | |
806 | { | |
807 | struct video_device *vfd = video_devdata(file); | |
808 | unsigned long req_events = poll_requested_events(wait); | |
809 | struct vb2_buffer *vb = NULL; | |
810 | unsigned int res = 0; | |
811 | unsigned long flags; | |
812 | ||
813 | if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) { | |
814 | struct v4l2_fh *fh = file->private_data; | |
815 | ||
816 | if (v4l2_event_pending(fh)) | |
817 | res = POLLPRI; | |
818 | else if (req_events & POLLPRI) | |
819 | poll_wait(file, &fh->wait, wait); | |
820 | } | |
821 | ||
822 | if (!q->is_output && !(req_events & (POLLIN | POLLRDNORM))) | |
823 | return res; | |
824 | if (q->is_output && !(req_events & (POLLOUT | POLLWRNORM))) | |
825 | return res; | |
826 | ||
827 | /* | |
828 | * Start file I/O emulator only if streaming API has not been used yet. | |
829 | */ | |
830 | if (q->num_buffers == 0 && !vb2_fileio_is_active(q)) { | |
831 | if (!q->is_output && (q->io_modes & VB2_READ) && | |
832 | (req_events & (POLLIN | POLLRDNORM))) { | |
833 | if (__vb2_init_fileio(q, 1)) | |
834 | return res | POLLERR; | |
835 | } | |
836 | if (q->is_output && (q->io_modes & VB2_WRITE) && | |
837 | (req_events & (POLLOUT | POLLWRNORM))) { | |
838 | if (__vb2_init_fileio(q, 0)) | |
839 | return res | POLLERR; | |
840 | /* | |
841 | * Write to OUTPUT queue can be done immediately. | |
842 | */ | |
843 | return res | POLLOUT | POLLWRNORM; | |
844 | } | |
845 | } | |
846 | ||
847 | /* | |
848 | * There is nothing to wait for if the queue isn't streaming, or if the | |
849 | * error flag is set. | |
850 | */ | |
851 | if (!vb2_is_streaming(q) || q->error) | |
852 | return res | POLLERR; | |
853 | /* | |
854 | * For compatibility with vb1: if QBUF hasn't been called yet, then | |
855 | * return POLLERR as well. This only affects capture queues, output | |
856 | * queues will always initialize waiting_for_buffers to false. | |
857 | */ | |
858 | if (q->waiting_for_buffers) | |
859 | return res | POLLERR; | |
860 | ||
861 | /* | |
4623e596 HV |
862 | * For output streams you can call write() as long as there are fewer |
863 | * buffers queued than there are buffers available. | |
3c5be988 | 864 | */ |
4623e596 | 865 | if (q->is_output && q->fileio && q->queued_count < q->num_buffers) |
3c5be988 JS |
866 | return res | POLLOUT | POLLWRNORM; |
867 | ||
868 | if (list_empty(&q->done_list)) { | |
869 | /* | |
870 | * If the last buffer was dequeued from a capture queue, | |
871 | * return immediately. DQBUF will return -EPIPE. | |
872 | */ | |
873 | if (q->last_buffer_dequeued) | |
874 | return res | POLLIN | POLLRDNORM; | |
875 | ||
876 | poll_wait(file, &q->done_wq, wait); | |
877 | } | |
878 | ||
879 | /* | |
880 | * Take first buffer available for dequeuing. | |
881 | */ | |
882 | spin_lock_irqsave(&q->done_lock, flags); | |
883 | if (!list_empty(&q->done_list)) | |
884 | vb = list_first_entry(&q->done_list, struct vb2_buffer, | |
885 | done_entry); | |
886 | spin_unlock_irqrestore(&q->done_lock, flags); | |
887 | ||
888 | if (vb && (vb->state == VB2_BUF_STATE_DONE | |
889 | || vb->state == VB2_BUF_STATE_ERROR)) { | |
890 | return (q->is_output) ? | |
891 | res | POLLOUT | POLLWRNORM : | |
892 | res | POLLIN | POLLRDNORM; | |
893 | } | |
894 | return res; | |
895 | } | |
896 | EXPORT_SYMBOL_GPL(vb2_poll); | |
897 | ||
898 | /** | |
899 | * struct vb2_fileio_buf - buffer context used by file io emulator | |
900 | * | |
901 | * vb2 provides a compatibility layer and emulator of file io (read and | |
902 | * write) calls on top of streaming API. This structure is used for | |
903 | * tracking context related to the buffers. | |
904 | */ | |
905 | struct vb2_fileio_buf { | |
906 | void *vaddr; | |
907 | unsigned int size; | |
908 | unsigned int pos; | |
909 | unsigned int queued:1; | |
910 | }; | |
911 | ||
912 | /** | |
913 | * struct vb2_fileio_data - queue context used by file io emulator | |
914 | * | |
915 | * @cur_index: the index of the buffer currently being read from or | |
916 | * written to. If equal to q->num_buffers then a new buffer | |
917 | * must be dequeued. | |
918 | * @initial_index: in the read() case all buffers are queued up immediately | |
919 | * in __vb2_init_fileio() and __vb2_perform_fileio() just cycles | |
920 | * buffers. However, in the write() case no buffers are initially | |
921 | * queued, instead whenever a buffer is full it is queued up by | |
922 | * __vb2_perform_fileio(). Only once all available buffers have | |
923 | * been queued up will __vb2_perform_fileio() start to dequeue | |
924 | * buffers. This means that initially __vb2_perform_fileio() | |
925 | * needs to know what buffer index to use when it is queuing up | |
926 | * the buffers for the first time. That initial index is stored | |
927 | * in this field. Once it is equal to q->num_buffers all | |
928 | * available buffers have been queued and __vb2_perform_fileio() | |
929 | * should start the normal dequeue/queue cycle. | |
930 | * | |
931 | * vb2 provides a compatibility layer and emulator of file io (read and | |
932 | * write) calls on top of streaming API. For proper operation it required | |
933 | * this structure to save the driver state between each call of the read | |
934 | * or write function. | |
935 | */ | |
936 | struct vb2_fileio_data { | |
937 | struct v4l2_requestbuffers req; | |
938 | struct v4l2_plane p; | |
939 | struct v4l2_buffer b; | |
940 | struct vb2_fileio_buf bufs[VB2_MAX_FRAME]; | |
941 | unsigned int cur_index; | |
942 | unsigned int initial_index; | |
943 | unsigned int q_count; | |
944 | unsigned int dq_count; | |
945 | unsigned read_once:1; | |
946 | unsigned write_immediately:1; | |
947 | }; | |
948 | ||
949 | /** | |
950 | * __vb2_init_fileio() - initialize file io emulator | |
951 | * @q: videobuf2 queue | |
952 | * @read: mode selector (1 means read, 0 means write) | |
953 | */ | |
954 | static int __vb2_init_fileio(struct vb2_queue *q, int read) | |
955 | { | |
956 | struct vb2_fileio_data *fileio; | |
957 | int i, ret; | |
958 | unsigned int count = 0; | |
959 | ||
960 | /* | |
961 | * Sanity check | |
962 | */ | |
963 | if (WARN_ON((read && !(q->io_modes & VB2_READ)) || | |
964 | (!read && !(q->io_modes & VB2_WRITE)))) | |
965 | return -EINVAL; | |
966 | ||
967 | /* | |
968 | * Check if device supports mapping buffers to kernel virtual space. | |
969 | */ | |
970 | if (!q->mem_ops->vaddr) | |
971 | return -EBUSY; | |
972 | ||
973 | /* | |
974 | * Check if streaming api has not been already activated. | |
975 | */ | |
976 | if (q->streaming || q->num_buffers > 0) | |
977 | return -EBUSY; | |
978 | ||
979 | /* | |
980 | * Start with count 1, driver can increase it in queue_setup() | |
981 | */ | |
982 | count = 1; | |
983 | ||
984 | dprintk(3, "setting up file io: mode %s, count %d, read_once %d, write_immediately %d\n", | |
985 | (read) ? "read" : "write", count, q->fileio_read_once, | |
986 | q->fileio_write_immediately); | |
987 | ||
988 | fileio = kzalloc(sizeof(struct vb2_fileio_data), GFP_KERNEL); | |
989 | if (fileio == NULL) | |
990 | return -ENOMEM; | |
991 | ||
992 | fileio->read_once = q->fileio_read_once; | |
993 | fileio->write_immediately = q->fileio_write_immediately; | |
994 | ||
995 | /* | |
996 | * Request buffers and use MMAP type to force driver | |
997 | * to allocate buffers by itself. | |
998 | */ | |
999 | fileio->req.count = count; | |
1000 | fileio->req.memory = VB2_MEMORY_MMAP; | |
1001 | fileio->req.type = q->type; | |
1002 | q->fileio = fileio; | |
1003 | ret = vb2_core_reqbufs(q, fileio->req.memory, &fileio->req.count); | |
1004 | if (ret) | |
1005 | goto err_kfree; | |
1006 | ||
1007 | /* | |
1008 | * Check if plane_count is correct | |
1009 | * (multiplane buffers are not supported). | |
1010 | */ | |
1011 | if (q->bufs[0]->num_planes != 1) { | |
1012 | ret = -EBUSY; | |
1013 | goto err_reqbufs; | |
1014 | } | |
1015 | ||
1016 | /* | |
1017 | * Get kernel address of each buffer. | |
1018 | */ | |
1019 | for (i = 0; i < q->num_buffers; i++) { | |
1020 | fileio->bufs[i].vaddr = vb2_plane_vaddr(q->bufs[i], 0); | |
1021 | if (fileio->bufs[i].vaddr == NULL) { | |
1022 | ret = -EINVAL; | |
1023 | goto err_reqbufs; | |
1024 | } | |
1025 | fileio->bufs[i].size = vb2_plane_size(q->bufs[i], 0); | |
1026 | } | |
1027 | ||
1028 | /* | |
1029 | * Read mode requires pre queuing of all buffers. | |
1030 | */ | |
1031 | if (read) { | |
1032 | bool is_multiplanar = q->is_multiplanar; | |
1033 | ||
1034 | /* | |
1035 | * Queue all buffers. | |
1036 | */ | |
1037 | for (i = 0; i < q->num_buffers; i++) { | |
1038 | struct v4l2_buffer *b = &fileio->b; | |
1039 | ||
1040 | memset(b, 0, sizeof(*b)); | |
1041 | b->type = q->type; | |
1042 | if (is_multiplanar) { | |
1043 | memset(&fileio->p, 0, sizeof(fileio->p)); | |
1044 | b->m.planes = &fileio->p; | |
1045 | b->length = 1; | |
1046 | } | |
1047 | b->memory = q->memory; | |
1048 | b->index = i; | |
1049 | ret = vb2_internal_qbuf(q, b); | |
1050 | if (ret) | |
1051 | goto err_reqbufs; | |
1052 | fileio->bufs[i].queued = 1; | |
1053 | } | |
1054 | /* | |
1055 | * All buffers have been queued, so mark that by setting | |
1056 | * initial_index to q->num_buffers | |
1057 | */ | |
1058 | fileio->initial_index = q->num_buffers; | |
1059 | fileio->cur_index = q->num_buffers; | |
1060 | } | |
1061 | ||
1062 | /* | |
1063 | * Start streaming. | |
1064 | */ | |
1065 | ret = vb2_core_streamon(q, q->type); | |
1066 | if (ret) | |
1067 | goto err_reqbufs; | |
1068 | ||
1069 | return ret; | |
1070 | ||
1071 | err_reqbufs: | |
1072 | fileio->req.count = 0; | |
1073 | vb2_core_reqbufs(q, fileio->req.memory, &fileio->req.count); | |
1074 | ||
1075 | err_kfree: | |
1076 | q->fileio = NULL; | |
1077 | kfree(fileio); | |
1078 | return ret; | |
1079 | } | |
1080 | ||
1081 | /** | |
1082 | * __vb2_cleanup_fileio() - free resourced used by file io emulator | |
1083 | * @q: videobuf2 queue | |
1084 | */ | |
1085 | static int __vb2_cleanup_fileio(struct vb2_queue *q) | |
1086 | { | |
1087 | struct vb2_fileio_data *fileio = q->fileio; | |
1088 | ||
1089 | if (fileio) { | |
1090 | vb2_core_streamoff(q, q->type); | |
1091 | q->fileio = NULL; | |
1092 | fileio->req.count = 0; | |
1093 | vb2_reqbufs(q, &fileio->req); | |
1094 | kfree(fileio); | |
1095 | dprintk(3, "file io emulator closed\n"); | |
1096 | } | |
1097 | return 0; | |
1098 | } | |
1099 | ||
1100 | /** | |
1101 | * __vb2_perform_fileio() - perform a single file io (read or write) operation | |
1102 | * @q: videobuf2 queue | |
1103 | * @data: pointed to target userspace buffer | |
1104 | * @count: number of bytes to read or write | |
1105 | * @ppos: file handle position tracking pointer | |
1106 | * @nonblock: mode selector (1 means blocking calls, 0 means nonblocking) | |
1107 | * @read: access mode selector (1 means read, 0 means write) | |
1108 | */ | |
1109 | static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_t count, | |
1110 | loff_t *ppos, int nonblock, int read) | |
1111 | { | |
1112 | struct vb2_fileio_data *fileio; | |
1113 | struct vb2_fileio_buf *buf; | |
1114 | bool is_multiplanar = q->is_multiplanar; | |
1115 | /* | |
1116 | * When using write() to write data to an output video node the vb2 core | |
1117 | * should set timestamps if V4L2_BUF_FLAG_TIMESTAMP_COPY is set. Nobody | |
1118 | * else is able to provide this information with the write() operation. | |
1119 | */ | |
1120 | bool set_timestamp = !read && | |
1121 | (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == | |
1122 | V4L2_BUF_FLAG_TIMESTAMP_COPY; | |
1123 | int ret, index; | |
1124 | ||
1125 | dprintk(3, "mode %s, offset %ld, count %zd, %sblocking\n", | |
1126 | read ? "read" : "write", (long)*ppos, count, | |
1127 | nonblock ? "non" : ""); | |
1128 | ||
1129 | if (!data) | |
1130 | return -EINVAL; | |
1131 | ||
1132 | /* | |
1133 | * Initialize emulator on first call. | |
1134 | */ | |
1135 | if (!vb2_fileio_is_active(q)) { | |
1136 | ret = __vb2_init_fileio(q, read); | |
1137 | dprintk(3, "vb2_init_fileio result: %d\n", ret); | |
1138 | if (ret) | |
1139 | return ret; | |
1140 | } | |
1141 | fileio = q->fileio; | |
1142 | ||
1143 | /* | |
1144 | * Check if we need to dequeue the buffer. | |
1145 | */ | |
1146 | index = fileio->cur_index; | |
1147 | if (index >= q->num_buffers) { | |
1148 | /* | |
1149 | * Call vb2_dqbuf to get buffer back. | |
1150 | */ | |
1151 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
1152 | fileio->b.type = q->type; | |
1153 | fileio->b.memory = q->memory; | |
1154 | if (is_multiplanar) { | |
1155 | memset(&fileio->p, 0, sizeof(fileio->p)); | |
1156 | fileio->b.m.planes = &fileio->p; | |
1157 | fileio->b.length = 1; | |
1158 | } | |
1159 | ret = vb2_internal_dqbuf(q, &fileio->b, nonblock); | |
1160 | dprintk(5, "vb2_dqbuf result: %d\n", ret); | |
1161 | if (ret) | |
1162 | return ret; | |
1163 | fileio->dq_count += 1; | |
1164 | ||
1165 | fileio->cur_index = index = fileio->b.index; | |
1166 | buf = &fileio->bufs[index]; | |
1167 | ||
1168 | /* | |
1169 | * Get number of bytes filled by the driver | |
1170 | */ | |
1171 | buf->pos = 0; | |
1172 | buf->queued = 0; | |
1173 | buf->size = read ? vb2_get_plane_payload(q->bufs[index], 0) | |
1174 | : vb2_plane_size(q->bufs[index], 0); | |
1175 | /* Compensate for data_offset on read in the multiplanar case. */ | |
1176 | if (is_multiplanar && read && | |
1177 | fileio->b.m.planes[0].data_offset < buf->size) { | |
1178 | buf->pos = fileio->b.m.planes[0].data_offset; | |
1179 | buf->size -= buf->pos; | |
1180 | } | |
1181 | } else { | |
1182 | buf = &fileio->bufs[index]; | |
1183 | } | |
1184 | ||
1185 | /* | |
1186 | * Limit count on last few bytes of the buffer. | |
1187 | */ | |
1188 | if (buf->pos + count > buf->size) { | |
1189 | count = buf->size - buf->pos; | |
1190 | dprintk(5, "reducing read count: %zd\n", count); | |
1191 | } | |
1192 | ||
1193 | /* | |
1194 | * Transfer data to userspace. | |
1195 | */ | |
1196 | dprintk(3, "copying %zd bytes - buffer %d, offset %u\n", | |
1197 | count, index, buf->pos); | |
1198 | if (read) | |
1199 | ret = copy_to_user(data, buf->vaddr + buf->pos, count); | |
1200 | else | |
1201 | ret = copy_from_user(buf->vaddr + buf->pos, data, count); | |
1202 | if (ret) { | |
1203 | dprintk(3, "error copying data\n"); | |
1204 | return -EFAULT; | |
1205 | } | |
1206 | ||
1207 | /* | |
1208 | * Update counters. | |
1209 | */ | |
1210 | buf->pos += count; | |
1211 | *ppos += count; | |
1212 | ||
1213 | /* | |
1214 | * Queue next buffer if required. | |
1215 | */ | |
1216 | if (buf->pos == buf->size || (!read && fileio->write_immediately)) { | |
1217 | /* | |
1218 | * Check if this is the last buffer to read. | |
1219 | */ | |
1220 | if (read && fileio->read_once && fileio->dq_count == 1) { | |
1221 | dprintk(3, "read limit reached\n"); | |
1222 | return __vb2_cleanup_fileio(q); | |
1223 | } | |
1224 | ||
1225 | /* | |
1226 | * Call vb2_qbuf and give buffer to the driver. | |
1227 | */ | |
1228 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
1229 | fileio->b.type = q->type; | |
1230 | fileio->b.memory = q->memory; | |
1231 | fileio->b.index = index; | |
1232 | fileio->b.bytesused = buf->pos; | |
1233 | if (is_multiplanar) { | |
1234 | memset(&fileio->p, 0, sizeof(fileio->p)); | |
1235 | fileio->p.bytesused = buf->pos; | |
1236 | fileio->b.m.planes = &fileio->p; | |
1237 | fileio->b.length = 1; | |
1238 | } | |
1239 | if (set_timestamp) | |
1240 | v4l2_get_timestamp(&fileio->b.timestamp); | |
1241 | ret = vb2_internal_qbuf(q, &fileio->b); | |
1242 | dprintk(5, "vb2_dbuf result: %d\n", ret); | |
1243 | if (ret) | |
1244 | return ret; | |
1245 | ||
1246 | /* | |
1247 | * Buffer has been queued, update the status | |
1248 | */ | |
1249 | buf->pos = 0; | |
1250 | buf->queued = 1; | |
1251 | buf->size = vb2_plane_size(q->bufs[index], 0); | |
1252 | fileio->q_count += 1; | |
1253 | /* | |
1254 | * If we are queuing up buffers for the first time, then | |
1255 | * increase initial_index by one. | |
1256 | */ | |
1257 | if (fileio->initial_index < q->num_buffers) | |
1258 | fileio->initial_index++; | |
1259 | /* | |
1260 | * The next buffer to use is either a buffer that's going to be | |
1261 | * queued for the first time (initial_index < q->num_buffers) | |
1262 | * or it is equal to q->num_buffers, meaning that the next | |
1263 | * time we need to dequeue a buffer since we've now queued up | |
1264 | * all the 'first time' buffers. | |
1265 | */ | |
1266 | fileio->cur_index = fileio->initial_index; | |
1267 | } | |
1268 | ||
1269 | /* | |
1270 | * Return proper number of bytes processed. | |
1271 | */ | |
1272 | if (ret == 0) | |
1273 | ret = count; | |
1274 | return ret; | |
1275 | } | |
1276 | ||
1277 | size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count, | |
1278 | loff_t *ppos, int nonblocking) | |
1279 | { | |
1280 | return __vb2_perform_fileio(q, data, count, ppos, nonblocking, 1); | |
1281 | } | |
1282 | EXPORT_SYMBOL_GPL(vb2_read); | |
1283 | ||
1284 | size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count, | |
1285 | loff_t *ppos, int nonblocking) | |
1286 | { | |
1287 | return __vb2_perform_fileio(q, (char __user *) data, count, | |
1288 | ppos, nonblocking, 0); | |
1289 | } | |
1290 | EXPORT_SYMBOL_GPL(vb2_write); | |
1291 | ||
1292 | struct vb2_threadio_data { | |
1293 | struct task_struct *thread; | |
1294 | vb2_thread_fnc fnc; | |
1295 | void *priv; | |
1296 | bool stop; | |
1297 | }; | |
1298 | ||
1299 | static int vb2_thread(void *data) | |
1300 | { | |
1301 | struct vb2_queue *q = data; | |
1302 | struct vb2_threadio_data *threadio = q->threadio; | |
1303 | struct vb2_fileio_data *fileio = q->fileio; | |
1304 | bool set_timestamp = false; | |
1305 | int prequeue = 0; | |
1306 | int index = 0; | |
1307 | int ret = 0; | |
1308 | ||
1309 | if (q->is_output) { | |
1310 | prequeue = q->num_buffers; | |
1311 | set_timestamp = | |
1312 | (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == | |
1313 | V4L2_BUF_FLAG_TIMESTAMP_COPY; | |
1314 | } | |
1315 | ||
1316 | set_freezable(); | |
1317 | ||
1318 | for (;;) { | |
1319 | struct vb2_buffer *vb; | |
1320 | ||
1321 | /* | |
1322 | * Call vb2_dqbuf to get buffer back. | |
1323 | */ | |
1324 | memset(&fileio->b, 0, sizeof(fileio->b)); | |
1325 | fileio->b.type = q->type; | |
1326 | fileio->b.memory = q->memory; | |
1327 | if (prequeue) { | |
1328 | fileio->b.index = index++; | |
1329 | prequeue--; | |
1330 | } else { | |
1331 | call_void_qop(q, wait_finish, q); | |
1332 | if (!threadio->stop) | |
1333 | ret = vb2_internal_dqbuf(q, &fileio->b, 0); | |
1334 | call_void_qop(q, wait_prepare, q); | |
1335 | dprintk(5, "file io: vb2_dqbuf result: %d\n", ret); | |
1336 | } | |
1337 | if (ret || threadio->stop) | |
1338 | break; | |
1339 | try_to_freeze(); | |
1340 | ||
1341 | vb = q->bufs[fileio->b.index]; | |
1342 | if (!(fileio->b.flags & V4L2_BUF_FLAG_ERROR)) | |
1343 | if (threadio->fnc(vb, threadio->priv)) | |
1344 | break; | |
1345 | call_void_qop(q, wait_finish, q); | |
1346 | if (set_timestamp) | |
1347 | v4l2_get_timestamp(&fileio->b.timestamp); | |
1348 | if (!threadio->stop) | |
1349 | ret = vb2_internal_qbuf(q, &fileio->b); | |
1350 | call_void_qop(q, wait_prepare, q); | |
1351 | if (ret || threadio->stop) | |
1352 | break; | |
1353 | } | |
1354 | ||
1355 | /* Hmm, linux becomes *very* unhappy without this ... */ | |
1356 | while (!kthread_should_stop()) { | |
1357 | set_current_state(TASK_INTERRUPTIBLE); | |
1358 | schedule(); | |
1359 | } | |
1360 | return 0; | |
1361 | } | |
1362 | ||
1363 | /* | |
1364 | * This function should not be used for anything else but the videobuf2-dvb | |
1365 | * support. If you think you have another good use-case for this, then please | |
1366 | * contact the linux-media mailinglist first. | |
1367 | */ | |
1368 | int vb2_thread_start(struct vb2_queue *q, vb2_thread_fnc fnc, void *priv, | |
1369 | const char *thread_name) | |
1370 | { | |
1371 | struct vb2_threadio_data *threadio; | |
1372 | int ret = 0; | |
1373 | ||
1374 | if (q->threadio) | |
1375 | return -EBUSY; | |
1376 | if (vb2_is_busy(q)) | |
1377 | return -EBUSY; | |
1378 | if (WARN_ON(q->fileio)) | |
1379 | return -EBUSY; | |
1380 | ||
1381 | threadio = kzalloc(sizeof(*threadio), GFP_KERNEL); | |
1382 | if (threadio == NULL) | |
1383 | return -ENOMEM; | |
1384 | threadio->fnc = fnc; | |
1385 | threadio->priv = priv; | |
1386 | ||
1387 | ret = __vb2_init_fileio(q, !q->is_output); | |
1388 | dprintk(3, "file io: vb2_init_fileio result: %d\n", ret); | |
1389 | if (ret) | |
1390 | goto nomem; | |
1391 | q->threadio = threadio; | |
1392 | threadio->thread = kthread_run(vb2_thread, q, "vb2-%s", thread_name); | |
1393 | if (IS_ERR(threadio->thread)) { | |
1394 | ret = PTR_ERR(threadio->thread); | |
1395 | threadio->thread = NULL; | |
1396 | goto nothread; | |
1397 | } | |
1398 | return 0; | |
1399 | ||
1400 | nothread: | |
1401 | __vb2_cleanup_fileio(q); | |
1402 | nomem: | |
1403 | kfree(threadio); | |
1404 | return ret; | |
1405 | } | |
1406 | EXPORT_SYMBOL_GPL(vb2_thread_start); | |
1407 | ||
1408 | int vb2_thread_stop(struct vb2_queue *q) | |
1409 | { | |
1410 | struct vb2_threadio_data *threadio = q->threadio; | |
1411 | int err; | |
1412 | ||
1413 | if (threadio == NULL) | |
1414 | return 0; | |
1415 | threadio->stop = true; | |
1416 | /* Wake up all pending sleeps in the thread */ | |
1417 | vb2_queue_error(q); | |
1418 | err = kthread_stop(threadio->thread); | |
1419 | __vb2_cleanup_fileio(q); | |
1420 | threadio->thread = NULL; | |
1421 | kfree(threadio); | |
1422 | q->threadio = NULL; | |
1423 | return err; | |
1424 | } | |
1425 | EXPORT_SYMBOL_GPL(vb2_thread_stop); | |
1426 | ||
1427 | /* | |
1428 | * The following functions are not part of the vb2 core API, but are helper | |
1429 | * functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations | |
1430 | * and struct vb2_ops. | |
1431 | * They contain boilerplate code that most if not all drivers have to do | |
1432 | * and so they simplify the driver code. | |
1433 | */ | |
1434 | ||
1435 | /* The queue is busy if there is a owner and you are not that owner. */ | |
1436 | static inline bool vb2_queue_is_busy(struct video_device *vdev, struct file *file) | |
1437 | { | |
1438 | return vdev->queue->owner && vdev->queue->owner != file->private_data; | |
1439 | } | |
1440 | ||
1441 | /* vb2 ioctl helpers */ | |
1442 | ||
1443 | int vb2_ioctl_reqbufs(struct file *file, void *priv, | |
1444 | struct v4l2_requestbuffers *p) | |
1445 | { | |
1446 | struct video_device *vdev = video_devdata(file); | |
1447 | int res = vb2_verify_memory_type(vdev->queue, p->memory, p->type); | |
1448 | ||
1449 | if (res) | |
1450 | return res; | |
1451 | if (vb2_queue_is_busy(vdev, file)) | |
1452 | return -EBUSY; | |
1453 | res = vb2_core_reqbufs(vdev->queue, p->memory, &p->count); | |
1454 | /* If count == 0, then the owner has released all buffers and he | |
1455 | is no longer owner of the queue. Otherwise we have a new owner. */ | |
1456 | if (res == 0) | |
1457 | vdev->queue->owner = p->count ? file->private_data : NULL; | |
1458 | return res; | |
1459 | } | |
1460 | EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs); | |
1461 | ||
1462 | int vb2_ioctl_create_bufs(struct file *file, void *priv, | |
1463 | struct v4l2_create_buffers *p) | |
1464 | { | |
1465 | struct video_device *vdev = video_devdata(file); | |
1466 | int res = vb2_verify_memory_type(vdev->queue, p->memory, | |
1467 | p->format.type); | |
1468 | ||
1469 | p->index = vdev->queue->num_buffers; | |
1470 | /* | |
1471 | * If count == 0, then just check if memory and type are valid. | |
1472 | * Any -EBUSY result from vb2_verify_memory_type can be mapped to 0. | |
1473 | */ | |
1474 | if (p->count == 0) | |
1475 | return res != -EBUSY ? res : 0; | |
1476 | if (res) | |
1477 | return res; | |
1478 | if (vb2_queue_is_busy(vdev, file)) | |
1479 | return -EBUSY; | |
df9ecb0c HV |
1480 | |
1481 | res = vb2_create_bufs(vdev->queue, p); | |
3c5be988 JS |
1482 | if (res == 0) |
1483 | vdev->queue->owner = file->private_data; | |
1484 | return res; | |
1485 | } | |
1486 | EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs); | |
1487 | ||
1488 | int vb2_ioctl_prepare_buf(struct file *file, void *priv, | |
1489 | struct v4l2_buffer *p) | |
1490 | { | |
1491 | struct video_device *vdev = video_devdata(file); | |
1492 | ||
1493 | if (vb2_queue_is_busy(vdev, file)) | |
1494 | return -EBUSY; | |
1495 | return vb2_prepare_buf(vdev->queue, p); | |
1496 | } | |
1497 | EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf); | |
1498 | ||
1499 | int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
1500 | { | |
1501 | struct video_device *vdev = video_devdata(file); | |
1502 | ||
1503 | /* No need to call vb2_queue_is_busy(), anyone can query buffers. */ | |
1504 | return vb2_querybuf(vdev->queue, p); | |
1505 | } | |
1506 | EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf); | |
1507 | ||
1508 | int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
1509 | { | |
1510 | struct video_device *vdev = video_devdata(file); | |
1511 | ||
1512 | if (vb2_queue_is_busy(vdev, file)) | |
1513 | return -EBUSY; | |
1514 | return vb2_qbuf(vdev->queue, p); | |
1515 | } | |
1516 | EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf); | |
1517 | ||
1518 | int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p) | |
1519 | { | |
1520 | struct video_device *vdev = video_devdata(file); | |
1521 | ||
1522 | if (vb2_queue_is_busy(vdev, file)) | |
1523 | return -EBUSY; | |
1524 | return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK); | |
1525 | } | |
1526 | EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf); | |
1527 | ||
1528 | int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i) | |
1529 | { | |
1530 | struct video_device *vdev = video_devdata(file); | |
1531 | ||
1532 | if (vb2_queue_is_busy(vdev, file)) | |
1533 | return -EBUSY; | |
1534 | return vb2_streamon(vdev->queue, i); | |
1535 | } | |
1536 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamon); | |
1537 | ||
1538 | int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i) | |
1539 | { | |
1540 | struct video_device *vdev = video_devdata(file); | |
1541 | ||
1542 | if (vb2_queue_is_busy(vdev, file)) | |
1543 | return -EBUSY; | |
1544 | return vb2_streamoff(vdev->queue, i); | |
1545 | } | |
1546 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff); | |
1547 | ||
1548 | int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p) | |
1549 | { | |
1550 | struct video_device *vdev = video_devdata(file); | |
1551 | ||
1552 | if (vb2_queue_is_busy(vdev, file)) | |
1553 | return -EBUSY; | |
1554 | return vb2_expbuf(vdev->queue, p); | |
1555 | } | |
1556 | EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf); | |
1557 | ||
1558 | /* v4l2_file_operations helpers */ | |
1559 | ||
1560 | int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma) | |
1561 | { | |
1562 | struct video_device *vdev = video_devdata(file); | |
1563 | ||
1564 | return vb2_mmap(vdev->queue, vma); | |
1565 | } | |
1566 | EXPORT_SYMBOL_GPL(vb2_fop_mmap); | |
1567 | ||
1568 | int _vb2_fop_release(struct file *file, struct mutex *lock) | |
1569 | { | |
1570 | struct video_device *vdev = video_devdata(file); | |
1571 | ||
1572 | if (lock) | |
1573 | mutex_lock(lock); | |
1574 | if (file->private_data == vdev->queue->owner) { | |
1575 | vb2_queue_release(vdev->queue); | |
1576 | vdev->queue->owner = NULL; | |
1577 | } | |
1578 | if (lock) | |
1579 | mutex_unlock(lock); | |
1580 | return v4l2_fh_release(file); | |
1581 | } | |
1582 | EXPORT_SYMBOL_GPL(_vb2_fop_release); | |
1583 | ||
1584 | int vb2_fop_release(struct file *file) | |
1585 | { | |
1586 | struct video_device *vdev = video_devdata(file); | |
1587 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
1588 | ||
1589 | return _vb2_fop_release(file, lock); | |
1590 | } | |
1591 | EXPORT_SYMBOL_GPL(vb2_fop_release); | |
1592 | ||
1593 | ssize_t vb2_fop_write(struct file *file, const char __user *buf, | |
1594 | size_t count, loff_t *ppos) | |
1595 | { | |
1596 | struct video_device *vdev = video_devdata(file); | |
1597 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
1598 | int err = -EBUSY; | |
1599 | ||
1600 | if (!(vdev->queue->io_modes & VB2_WRITE)) | |
1601 | return -EINVAL; | |
1602 | if (lock && mutex_lock_interruptible(lock)) | |
1603 | return -ERESTARTSYS; | |
1604 | if (vb2_queue_is_busy(vdev, file)) | |
1605 | goto exit; | |
1606 | err = vb2_write(vdev->queue, buf, count, ppos, | |
1607 | file->f_flags & O_NONBLOCK); | |
1608 | if (vdev->queue->fileio) | |
1609 | vdev->queue->owner = file->private_data; | |
1610 | exit: | |
1611 | if (lock) | |
1612 | mutex_unlock(lock); | |
1613 | return err; | |
1614 | } | |
1615 | EXPORT_SYMBOL_GPL(vb2_fop_write); | |
1616 | ||
1617 | ssize_t vb2_fop_read(struct file *file, char __user *buf, | |
1618 | size_t count, loff_t *ppos) | |
1619 | { | |
1620 | struct video_device *vdev = video_devdata(file); | |
1621 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; | |
1622 | int err = -EBUSY; | |
1623 | ||
1624 | if (!(vdev->queue->io_modes & VB2_READ)) | |
1625 | return -EINVAL; | |
1626 | if (lock && mutex_lock_interruptible(lock)) | |
1627 | return -ERESTARTSYS; | |
1628 | if (vb2_queue_is_busy(vdev, file)) | |
1629 | goto exit; | |
1630 | err = vb2_read(vdev->queue, buf, count, ppos, | |
1631 | file->f_flags & O_NONBLOCK); | |
1632 | if (vdev->queue->fileio) | |
1633 | vdev->queue->owner = file->private_data; | |
1634 | exit: | |
1635 | if (lock) | |
1636 | mutex_unlock(lock); | |
1637 | return err; | |
1638 | } | |
1639 | EXPORT_SYMBOL_GPL(vb2_fop_read); | |
1640 | ||
1641 | unsigned int vb2_fop_poll(struct file *file, poll_table *wait) | |
1642 | { | |
1643 | struct video_device *vdev = video_devdata(file); | |
1644 | struct vb2_queue *q = vdev->queue; | |
1645 | struct mutex *lock = q->lock ? q->lock : vdev->lock; | |
1646 | unsigned res; | |
1647 | void *fileio; | |
1648 | ||
1649 | /* | |
1650 | * If this helper doesn't know how to lock, then you shouldn't be using | |
1651 | * it but you should write your own. | |
1652 | */ | |
1653 | WARN_ON(!lock); | |
1654 | ||
1655 | if (lock && mutex_lock_interruptible(lock)) | |
1656 | return POLLERR; | |
1657 | ||
1658 | fileio = q->fileio; | |
1659 | ||
1660 | res = vb2_poll(vdev->queue, file, wait); | |
1661 | ||
1662 | /* If fileio was started, then we have a new queue owner. */ | |
1663 | if (!fileio && q->fileio) | |
1664 | q->owner = file->private_data; | |
1665 | if (lock) | |
1666 | mutex_unlock(lock); | |
1667 | return res; | |
1668 | } | |
1669 | EXPORT_SYMBOL_GPL(vb2_fop_poll); | |
1670 | ||
1671 | #ifndef CONFIG_MMU | |
1672 | unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr, | |
1673 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
1674 | { | |
1675 | struct video_device *vdev = video_devdata(file); | |
1676 | ||
1677 | return vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags); | |
1678 | } | |
1679 | EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area); | |
1680 | #endif | |
1681 | ||
1682 | /* vb2_ops helpers. Only use if vq->lock is non-NULL. */ | |
1683 | ||
1684 | void vb2_ops_wait_prepare(struct vb2_queue *vq) | |
1685 | { | |
1686 | mutex_unlock(vq->lock); | |
1687 | } | |
1688 | EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare); | |
1689 | ||
1690 | void vb2_ops_wait_finish(struct vb2_queue *vq) | |
1691 | { | |
1692 | mutex_lock(vq->lock); | |
1693 | } | |
1694 | EXPORT_SYMBOL_GPL(vb2_ops_wait_finish); | |
1695 | ||
c139990e JS |
1696 | MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2"); |
1697 | MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski"); | |
1698 | MODULE_LICENSE("GPL"); |