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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / drivers / media / video / videobuf-core.c
blob1258fe15f5cfffe16d6a917413523e650dc0c2cb
1 /*
2 * generic helper functions for handling video4linux capture buffers
3 *
4 * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
5 *
6 * Highly based on video-buf written originally by:
7 * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
8 * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org>
9 * (c) 2006 Ted Walther and John Sokol
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2
14 */
15
16 #include <linux/init.h>
17 #include <linux/module.h>
18 #include <linux/moduleparam.h>
19 #include <linux/mm.h>
20 #include <linux/sched.h>
21 #include <linux/slab.h>
22 #include <linux/interrupt.h>
23
24 #include <media/videobuf-core.h>
25
26 #define MAGIC_BUFFER 0x20070728
27 #define MAGIC_CHECK(is, should) \
28 do { \
29 if (unlikely((is) != (should))) { \
30 printk(KERN_ERR \
31 "magic mismatch: %x (expected %x)\n", \
32 is, should); \
33 BUG(); \
34 } \
35 } while (0)
36
37 static int debug;
38 module_param(debug, int, 0644);
39
40 MODULE_DESCRIPTION("helper module to manage video4linux buffers");
41 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
42 MODULE_LICENSE("GPL");
43
44 #define dprintk(level, fmt, arg...) \
45 do { \
46 if (debug >= level) \
47 printk(KERN_DEBUG "vbuf: " fmt, ## arg); \
48 } while (0)
49
50 /* --------------------------------------------------------------------- */
51
52 #define CALL(q, f, arg...) \
53 ((q->int_ops->f) ? q->int_ops->f(arg) : 0)
54
55 struct videobuf_buffer *videobuf_alloc_vb(struct videobuf_queue *q)
56 {
57 struct videobuf_buffer *vb;
58
59 BUG_ON(q->msize < sizeof(*vb));
60
61 if (!q->int_ops || !q->int_ops->alloc_vb) {
62 printk(KERN_ERR "No specific ops defined!\n");
63 BUG();
64 }
65
66 vb = q->int_ops->alloc_vb(q->msize);
67 if (NULL != vb) {
68 init_waitqueue_head(&vb->done);
69 vb->magic = MAGIC_BUFFER;
70 }
71
72 return vb;
73 }
74 EXPORT_SYMBOL_GPL(videobuf_alloc_vb);
75
76 #define WAITON_CONDITION (vb->state != VIDEOBUF_ACTIVE &&\
77 vb->state != VIDEOBUF_QUEUED)
78 int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr)
79 {
80 MAGIC_CHECK(vb->magic, MAGIC_BUFFER);
81
82 if (non_blocking) {
83 if (WAITON_CONDITION)
84 return 0;
85 else
86 return -EAGAIN;
87 }
88
89 if (intr)
90 return wait_event_interruptible(vb->done, WAITON_CONDITION);
91 else
92 wait_event(vb->done, WAITON_CONDITION);
93
94 return 0;
95 }
96 EXPORT_SYMBOL_GPL(videobuf_waiton);
97
98 int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb,
99 struct v4l2_framebuffer *fbuf)
100 {
101 MAGIC_CHECK(vb->magic, MAGIC_BUFFER);
102 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
103
104 return CALL(q, iolock, q, vb, fbuf);
105 }
106 EXPORT_SYMBOL_GPL(videobuf_iolock);
107
108 void *videobuf_queue_to_vaddr(struct videobuf_queue *q,
109 struct videobuf_buffer *buf)
110 {
111 if (q->int_ops->vaddr)
112 return q->int_ops->vaddr(buf);
113 return NULL;
114 }
115 EXPORT_SYMBOL_GPL(videobuf_queue_to_vaddr);
116
117 /* --------------------------------------------------------------------- */
118
119
120 void videobuf_queue_core_init(struct videobuf_queue *q,
121 const struct videobuf_queue_ops *ops,
122 struct device *dev,
123 spinlock_t *irqlock,
124 enum v4l2_buf_type type,
125 enum v4l2_field field,
126 unsigned int msize,
127 void *priv,
128 struct videobuf_qtype_ops *int_ops)
129 {
130 BUG_ON(!q);
131 memset(q, 0, sizeof(*q));
132 q->irqlock = irqlock;
133 q->dev = dev;
134 q->type = type;
135 q->field = field;
136 q->msize = msize;
137 q->ops = ops;
138 q->priv_data = priv;
139 q->int_ops = int_ops;
140
141 /* All buffer operations are mandatory */
142 BUG_ON(!q->ops->buf_setup);
143 BUG_ON(!q->ops->buf_prepare);
144 BUG_ON(!q->ops->buf_queue);
145 BUG_ON(!q->ops->buf_release);
146
147 /* Lock is mandatory for queue_cancel to work */
148 BUG_ON(!irqlock);
149
150 /* Having implementations for abstract methods are mandatory */
151 BUG_ON(!q->int_ops);
152
153 mutex_init(&q->vb_lock);
154 init_waitqueue_head(&q->wait);
155 INIT_LIST_HEAD(&q->stream);
156 }
157 EXPORT_SYMBOL_GPL(videobuf_queue_core_init);
158
159 /* Locking: Only usage in bttv unsafe find way to remove */
160 int videobuf_queue_is_busy(struct videobuf_queue *q)
161 {
162 int i;
163
164 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
165
166 if (q->streaming) {
167 dprintk(1, "busy: streaming active\n");
168 return 1;
169 }
170 if (q->reading) {
171 dprintk(1, "busy: pending read #1\n");
172 return 1;
173 }
174 if (q->read_buf) {
175 dprintk(1, "busy: pending read #2\n");
176 return 1;
177 }
178 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
179 if (NULL == q->bufs[i])
180 continue;
181 if (q->bufs[i]->map) {
182 dprintk(1, "busy: buffer #%d mapped\n", i);
183 return 1;
184 }
185 if (q->bufs[i]->state == VIDEOBUF_QUEUED) {
186 dprintk(1, "busy: buffer #%d queued\n", i);
187 return 1;
188 }
189 if (q->bufs[i]->state == VIDEOBUF_ACTIVE) {
190 dprintk(1, "busy: buffer #%d avtive\n", i);
191 return 1;
192 }
193 }
194 return 0;
195 }
196 EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
197
198 /**
199 * __videobuf_free() - free all the buffers and their control structures
200 *
201 * This function can only be called if streaming/reading is off, i.e. no buffers
202 * are under control of the driver.
203 */
204 /* Locking: Caller holds q->vb_lock */
205 static int __videobuf_free(struct videobuf_queue *q)
206 {
207 int i;
208
209 dprintk(1, "%s\n", __func__);
210 if (!q)
211 return 0;
212
213 if (q->streaming || q->reading) {
214 dprintk(1, "Cannot free buffers when streaming or reading\n");
215 return -EBUSY;
216 }
217
218 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
219
220 for (i = 0; i < VIDEO_MAX_FRAME; i++)
221 if (q->bufs[i] && q->bufs[i]->map) {
222 dprintk(1, "Cannot free mmapped buffers\n");
223 return -EBUSY;
224 }
225
226 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
227 if (NULL == q->bufs[i])
228 continue;
229 q->ops->buf_release(q, q->bufs[i]);
230 kfree(q->bufs[i]);
231 q->bufs[i] = NULL;
232 }
233
234 return 0;
235 }
236
237 /* Locking: Caller holds q->vb_lock */
238 void videobuf_queue_cancel(struct videobuf_queue *q)
239 {
240 unsigned long flags = 0;
241 int i;
242
243 q->streaming = 0;
244 q->reading = 0;
245 wake_up_interruptible_sync(&q->wait);
246
247 /* remove queued buffers from list */
248 spin_lock_irqsave(q->irqlock, flags);
249 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
250 if (NULL == q->bufs[i])
251 continue;
252 if (q->bufs[i]->state == VIDEOBUF_QUEUED) {
253 list_del(&q->bufs[i]->queue);
254 q->bufs[i]->state = VIDEOBUF_ERROR;
255 wake_up_all(&q->bufs[i]->done);
256 }
257 }
258 spin_unlock_irqrestore(q->irqlock, flags);
259
260 /* free all buffers + clear queue */
261 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
262 if (NULL == q->bufs[i])
263 continue;
264 q->ops->buf_release(q, q->bufs[i]);
265 }
266 INIT_LIST_HEAD(&q->stream);
267 }
268 EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
269
270 /* --------------------------------------------------------------------- */
271
272 /* Locking: Caller holds q->vb_lock */
273 enum v4l2_field videobuf_next_field(struct videobuf_queue *q)
274 {
275 enum v4l2_field field = q->field;
276
277 BUG_ON(V4L2_FIELD_ANY == field);
278
279 if (V4L2_FIELD_ALTERNATE == field) {
280 if (V4L2_FIELD_TOP == q->last) {
281 field = V4L2_FIELD_BOTTOM;
282 q->last = V4L2_FIELD_BOTTOM;
283 } else {
284 field = V4L2_FIELD_TOP;
285 q->last = V4L2_FIELD_TOP;
286 }
287 }
288 return field;
289 }
290 EXPORT_SYMBOL_GPL(videobuf_next_field);
291
292 /* Locking: Caller holds q->vb_lock */
293 static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b,
294 struct videobuf_buffer *vb, enum v4l2_buf_type type)
295 {
296 MAGIC_CHECK(vb->magic, MAGIC_BUFFER);
297 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
298
299 b->index = vb->i;
300 b->type = type;
301
302 b->memory = vb->memory;
303 switch (b->memory) {
304 case V4L2_MEMORY_MMAP:
305 b->m.offset = vb->boff;
306 b->length = vb->bsize;
307 break;
308 case V4L2_MEMORY_USERPTR:
309 b->m.userptr = vb->baddr;
310 b->length = vb->bsize;
311 break;
312 case V4L2_MEMORY_OVERLAY:
313 b->m.offset = vb->boff;
314 break;
315 }
316
317 b->flags = 0;
318 if (vb->map)
319 b->flags |= V4L2_BUF_FLAG_MAPPED;
320
321 switch (vb->state) {
322 case VIDEOBUF_PREPARED:
323 case VIDEOBUF_QUEUED:
324 case VIDEOBUF_ACTIVE:
325 b->flags |= V4L2_BUF_FLAG_QUEUED;
326 break;
327 case VIDEOBUF_ERROR:
328 b->flags |= V4L2_BUF_FLAG_ERROR;
329 /* fall through */
330 case VIDEOBUF_DONE:
331 b->flags |= V4L2_BUF_FLAG_DONE;
332 break;
333 case VIDEOBUF_NEEDS_INIT:
334 case VIDEOBUF_IDLE:
335 /* nothing */
336 break;
337 }
338
339 if (vb->input != UNSET) {
340 b->flags |= V4L2_BUF_FLAG_INPUT;
341 b->input = vb->input;
342 }
343
344 b->field = vb->field;
345 b->timestamp = vb->ts;
346 b->bytesused = vb->size;
347 b->sequence = vb->field_count >> 1;
348 }
349
350 int videobuf_mmap_free(struct videobuf_queue *q)
351 {
352 int ret;
353 mutex_lock(&q->vb_lock);
354 ret = __videobuf_free(q);
355 mutex_unlock(&q->vb_lock);
356 return ret;
357 }
358 EXPORT_SYMBOL_GPL(videobuf_mmap_free);
359
360 /* Locking: Caller holds q->vb_lock */
361 int __videobuf_mmap_setup(struct videobuf_queue *q,
362 unsigned int bcount, unsigned int bsize,
363 enum v4l2_memory memory)
364 {
365 unsigned int i;
366 int err;
367
368 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
369
370 err = __videobuf_free(q);
371 if (0 != err)
372 return err;
373
374 /* Allocate and initialize buffers */
375 for (i = 0; i < bcount; i++) {
376 q->bufs[i] = videobuf_alloc_vb(q);
377
378 if (NULL == q->bufs[i])
379 break;
380
381 q->bufs[i]->i = i;
382 q->bufs[i]->input = UNSET;
383 q->bufs[i]->memory = memory;
384 q->bufs[i]->bsize = bsize;
385 switch (memory) {
386 case V4L2_MEMORY_MMAP:
387 q->bufs[i]->boff = PAGE_ALIGN(bsize) * i;
388 break;
389 case V4L2_MEMORY_USERPTR:
390 case V4L2_MEMORY_OVERLAY:
391 /* nothing */
392 break;
393 }
394 }
395
396 if (!i)
397 return -ENOMEM;
398
399 dprintk(1, "mmap setup: %d buffers, %d bytes each\n", i, bsize);
400
401 return i;
402 }
403 EXPORT_SYMBOL_GPL(__videobuf_mmap_setup);
404
405 int videobuf_mmap_setup(struct videobuf_queue *q,
406 unsigned int bcount, unsigned int bsize,
407 enum v4l2_memory memory)
408 {
409 int ret;
410 mutex_lock(&q->vb_lock);
411 ret = __videobuf_mmap_setup(q, bcount, bsize, memory);
412 mutex_unlock(&q->vb_lock);
413 return ret;
414 }
415 EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
416
417 int videobuf_reqbufs(struct videobuf_queue *q,
418 struct v4l2_requestbuffers *req)
419 {
420 unsigned int size, count;
421 int retval;
422
423 if (req->count < 1) {
424 dprintk(1, "reqbufs: count invalid (%d)\n", req->count);
425 return -EINVAL;
426 }
427
428 if (req->memory != V4L2_MEMORY_MMAP &&
429 req->memory != V4L2_MEMORY_USERPTR &&
430 req->memory != V4L2_MEMORY_OVERLAY) {
431 dprintk(1, "reqbufs: memory type invalid\n");
432 return -EINVAL;
433 }
434
435 mutex_lock(&q->vb_lock);
436 if (req->type != q->type) {
437 dprintk(1, "reqbufs: queue type invalid\n");
438 retval = -EINVAL;
439 goto done;
440 }
441
442 if (q->streaming) {
443 dprintk(1, "reqbufs: streaming already exists\n");
444 retval = -EBUSY;
445 goto done;
446 }
447 if (!list_empty(&q->stream)) {
448 dprintk(1, "reqbufs: stream running\n");
449 retval = -EBUSY;
450 goto done;
451 }
452
453 count = req->count;
454 if (count > VIDEO_MAX_FRAME)
455 count = VIDEO_MAX_FRAME;
456 size = 0;
457 q->ops->buf_setup(q, &count, &size);
458 dprintk(1, "reqbufs: bufs=%d, size=0x%x [%u pages total]\n",
459 count, size,
460 (unsigned int)((count * PAGE_ALIGN(size)) >> PAGE_SHIFT));
461
462 retval = __videobuf_mmap_setup(q, count, size, req->memory);
463 if (retval < 0) {
464 dprintk(1, "reqbufs: mmap setup returned %d\n", retval);
465 goto done;
466 }
467
468 req->count = retval;
469 retval = 0;
470
471 done:
472 mutex_unlock(&q->vb_lock);
473 return retval;
474 }
475 EXPORT_SYMBOL_GPL(videobuf_reqbufs);
476
477 int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
478 {
479 int ret = -EINVAL;
480
481 mutex_lock(&q->vb_lock);
482 if (unlikely(b->type != q->type)) {
483 dprintk(1, "querybuf: Wrong type.\n");
484 goto done;
485 }
486 if (unlikely(b->index >= VIDEO_MAX_FRAME)) {
487 dprintk(1, "querybuf: index out of range.\n");
488 goto done;
489 }
490 if (unlikely(NULL == q->bufs[b->index])) {
491 dprintk(1, "querybuf: buffer is null.\n");
492 goto done;
493 }
494
495 videobuf_status(q, b, q->bufs[b->index], q->type);
496
497 ret = 0;
498 done:
499 mutex_unlock(&q->vb_lock);
500 return ret;
501 }
502 EXPORT_SYMBOL_GPL(videobuf_querybuf);
503
504 int videobuf_qbuf(struct videobuf_queue *q, struct v4l2_buffer *b)
505 {
506 struct videobuf_buffer *buf;
507 enum v4l2_field field;
508 unsigned long flags = 0;
509 int retval;
510
511 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
512
513 if (b->memory == V4L2_MEMORY_MMAP)
514 down_read(&current->mm->mmap_sem);
515
516 mutex_lock(&q->vb_lock);
517 retval = -EBUSY;
518 if (q->reading) {
519 dprintk(1, "qbuf: Reading running...\n");
520 goto done;
521 }
522 retval = -EINVAL;
523 if (b->type != q->type) {
524 dprintk(1, "qbuf: Wrong type.\n");
525 goto done;
526 }
527 if (b->index >= VIDEO_MAX_FRAME) {
528 dprintk(1, "qbuf: index out of range.\n");
529 goto done;
530 }
531 buf = q->bufs[b->index];
532 if (NULL == buf) {
533 dprintk(1, "qbuf: buffer is null.\n");
534 goto done;
535 }
536 MAGIC_CHECK(buf->magic, MAGIC_BUFFER);
537 if (buf->memory != b->memory) {
538 dprintk(1, "qbuf: memory type is wrong.\n");
539 goto done;
540 }
541 if (buf->state != VIDEOBUF_NEEDS_INIT && buf->state != VIDEOBUF_IDLE) {
542 dprintk(1, "qbuf: buffer is already queued or active.\n");
543 goto done;
544 }
545
546 if (b->flags & V4L2_BUF_FLAG_INPUT) {
547 if (b->input >= q->inputs) {
548 dprintk(1, "qbuf: wrong input.\n");
549 goto done;
550 }
551 buf->input = b->input;
552 } else {
553 buf->input = UNSET;
554 }
555
556 switch (b->memory) {
557 case V4L2_MEMORY_MMAP:
558 if (0 == buf->baddr) {
559 dprintk(1, "qbuf: mmap requested "
560 "but buffer addr is zero!\n");
561 goto done;
562 }
563 if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT
564 || q->type == V4L2_BUF_TYPE_VBI_OUTPUT
565 || q->type == V4L2_BUF_TYPE_SLICED_VBI_OUTPUT) {
566 buf->size = b->bytesused;
567 buf->field = b->field;
568 buf->ts = b->timestamp;
569 }
570 break;
571 case V4L2_MEMORY_USERPTR:
572 if (b->length < buf->bsize) {
573 dprintk(1, "qbuf: buffer length is not enough\n");
574 goto done;
575 }
576 if (VIDEOBUF_NEEDS_INIT != buf->state &&
577 buf->baddr != b->m.userptr)
578 q->ops->buf_release(q, buf);
579 buf->baddr = b->m.userptr;
580 break;
581 case V4L2_MEMORY_OVERLAY:
582 buf->boff = b->m.offset;
583 break;
584 default:
585 dprintk(1, "qbuf: wrong memory type\n");
586 goto done;
587 }
588
589 dprintk(1, "qbuf: requesting next field\n");
590 field = videobuf_next_field(q);
591 retval = q->ops->buf_prepare(q, buf, field);
592 if (0 != retval) {
593 dprintk(1, "qbuf: buffer_prepare returned %d\n", retval);
594 goto done;
595 }
596
597 list_add_tail(&buf->stream, &q->stream);
598 if (q->streaming) {
599 spin_lock_irqsave(q->irqlock, flags);
600 q->ops->buf_queue(q, buf);
601 spin_unlock_irqrestore(q->irqlock, flags);
602 }
603 dprintk(1, "qbuf: succeeded\n");
604 retval = 0;
605 wake_up_interruptible_sync(&q->wait);
606
607 done:
608 mutex_unlock(&q->vb_lock);
609
610 if (b->memory == V4L2_MEMORY_MMAP)
611 up_read(&current->mm->mmap_sem);
612
613 return retval;
614 }
615 EXPORT_SYMBOL_GPL(videobuf_qbuf);
616
617 /* Locking: Caller holds q->vb_lock */
618 static int stream_next_buffer_check_queue(struct videobuf_queue *q, int noblock)
619 {
620 int retval;
621
622 checks:
623 if (!q->streaming) {
624 dprintk(1, "next_buffer: Not streaming\n");
625 retval = -EINVAL;
626 goto done;
627 }
628
629 if (list_empty(&q->stream)) {
630 if (noblock) {
631 retval = -EAGAIN;
632 dprintk(2, "next_buffer: no buffers to dequeue\n");
633 goto done;
634 } else {
635 dprintk(2, "next_buffer: waiting on buffer\n");
636
637 /* Drop lock to avoid deadlock with qbuf */
638 mutex_unlock(&q->vb_lock);
639
640 /* Checking list_empty and streaming is safe without
641 * locks because we goto checks to validate while
642 * holding locks before proceeding */
643 retval = wait_event_interruptible(q->wait,
644 !list_empty(&q->stream) || !q->streaming);
645 mutex_lock(&q->vb_lock);
646
647 if (retval)
648 goto done;
649
650 goto checks;
651 }
652 }
653
654 retval = 0;
655
656 done:
657 return retval;
658 }
659
660 /* Locking: Caller holds q->vb_lock */
661 static int stream_next_buffer(struct videobuf_queue *q,
662 struct videobuf_buffer **vb, int nonblocking)
663 {
664 int retval;
665 struct videobuf_buffer *buf = NULL;
666
667 retval = stream_next_buffer_check_queue(q, nonblocking);
668 if (retval)
669 goto done;
670
671 buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
672 retval = videobuf_waiton(buf, nonblocking, 1);
673 if (retval < 0)
674 goto done;
675
676 *vb = buf;
677 done:
678 return retval;
679 }
680
681 int videobuf_dqbuf(struct videobuf_queue *q,
682 struct v4l2_buffer *b, int nonblocking)
683 {
684 struct videobuf_buffer *buf = NULL;
685 int retval;
686
687 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
688
689 memset(b, 0, sizeof(*b));
690 mutex_lock(&q->vb_lock);
691
692 retval = stream_next_buffer(q, &buf, nonblocking);
693 if (retval < 0) {
694 dprintk(1, "dqbuf: next_buffer error: %i\n", retval);
695 goto done;
696 }
697
698 switch (buf->state) {
699 case VIDEOBUF_ERROR:
700 dprintk(1, "dqbuf: state is error\n");
701 break;
702 case VIDEOBUF_DONE:
703 dprintk(1, "dqbuf: state is done\n");
704 break;
705 default:
706 dprintk(1, "dqbuf: state invalid\n");
707 retval = -EINVAL;
708 goto done;
709 }
710 CALL(q, sync, q, buf);
711 videobuf_status(q, b, buf, q->type);
712 list_del(&buf->stream);
713 buf->state = VIDEOBUF_IDLE;
714 b->flags &= ~V4L2_BUF_FLAG_DONE;
715 done:
716 mutex_unlock(&q->vb_lock);
717 return retval;
718 }
719 EXPORT_SYMBOL_GPL(videobuf_dqbuf);
720
721 int videobuf_streamon(struct videobuf_queue *q)
722 {
723 struct videobuf_buffer *buf;
724 unsigned long flags = 0;
725 int retval;
726
727 mutex_lock(&q->vb_lock);
728 retval = -EBUSY;
729 if (q->reading)
730 goto done;
731 retval = 0;
732 if (q->streaming)
733 goto done;
734 q->streaming = 1;
735 spin_lock_irqsave(q->irqlock, flags);
736 list_for_each_entry(buf, &q->stream, stream)
737 if (buf->state == VIDEOBUF_PREPARED)
738 q->ops->buf_queue(q, buf);
739 spin_unlock_irqrestore(q->irqlock, flags);
740
741 wake_up_interruptible_sync(&q->wait);
742 done:
743 mutex_unlock(&q->vb_lock);
744 return retval;
745 }
746 EXPORT_SYMBOL_GPL(videobuf_streamon);
747
748 /* Locking: Caller holds q->vb_lock */
749 static int __videobuf_streamoff(struct videobuf_queue *q)
750 {
751 if (!q->streaming)
752 return -EINVAL;
753
754 videobuf_queue_cancel(q);
755
756 return 0;
757 }
758
759 int videobuf_streamoff(struct videobuf_queue *q)
760 {
761 int retval;
762
763 mutex_lock(&q->vb_lock);
764 retval = __videobuf_streamoff(q);
765 mutex_unlock(&q->vb_lock);
766
767 return retval;
768 }
769 EXPORT_SYMBOL_GPL(videobuf_streamoff);
770
771 /* Locking: Caller holds q->vb_lock */
772 static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q,
773 char __user *data,
774 size_t count, loff_t *ppos)
775 {
776 enum v4l2_field field;
777 unsigned long flags = 0;
778 int retval;
779
780 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
781
782 /* setup stuff */
783 q->read_buf = videobuf_alloc_vb(q);
784 if (NULL == q->read_buf)
785 return -ENOMEM;
786
787 q->read_buf->memory = V4L2_MEMORY_USERPTR;
788 q->read_buf->baddr = (unsigned long)data;
789 q->read_buf->bsize = count;
790
791 field = videobuf_next_field(q);
792 retval = q->ops->buf_prepare(q, q->read_buf, field);
793 if (0 != retval)
794 goto done;
795
796 /* start capture & wait */
797 spin_lock_irqsave(q->irqlock, flags);
798 q->ops->buf_queue(q, q->read_buf);
799 spin_unlock_irqrestore(q->irqlock, flags);
800 retval = videobuf_waiton(q->read_buf, 0, 0);
801 if (0 == retval) {
802 CALL(q, sync, q, q->read_buf);
803 if (VIDEOBUF_ERROR == q->read_buf->state)
804 retval = -EIO;
805 else
806 retval = q->read_buf->size;
807 }
808
809 done:
810 /* cleanup */
811 q->ops->buf_release(q, q->read_buf);
812 kfree(q->read_buf);
813 q->read_buf = NULL;
814 return retval;
815 }
816
817 static int __videobuf_copy_to_user(struct videobuf_queue *q,
818 struct videobuf_buffer *buf,
819 char __user *data, size_t count,
820 int nonblocking)
821 {
822 void *vaddr = CALL(q, vaddr, buf);
823
824 /* copy to userspace */
825 if (count > buf->size - q->read_off)
826 count = buf->size - q->read_off;
827
828 if (copy_to_user(data, vaddr + q->read_off, count))
829 return -EFAULT;
830
831 return count;
832 }
833
834 static int __videobuf_copy_stream(struct videobuf_queue *q,
835 struct videobuf_buffer *buf,
836 char __user *data, size_t count, size_t pos,
837 int vbihack, int nonblocking)
838 {
839 unsigned int *fc = CALL(q, vaddr, buf);
840
841 if (vbihack) {
842 /* dirty, undocumented hack -- pass the frame counter
843 * within the last four bytes of each vbi data block.
844 * We need that one to maintain backward compatibility
845 * to all vbi decoding software out there ... */
846 fc += (buf->size >> 2) - 1;
847 *fc = buf->field_count >> 1;
848 dprintk(1, "vbihack: %d\n", *fc);
849 }
850
851 /* copy stuff using the common method */
852 count = __videobuf_copy_to_user(q, buf, data, count, nonblocking);
853
854 if ((count == -EFAULT) && (pos == 0))
855 return -EFAULT;
856
857 return count;
858 }
859
860 ssize_t videobuf_read_one(struct videobuf_queue *q,
861 char __user *data, size_t count, loff_t *ppos,
862 int nonblocking)
863 {
864 enum v4l2_field field;
865 unsigned long flags = 0;
866 unsigned size = 0, nbufs = 1;
867 int retval;
868
869 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
870
871 mutex_lock(&q->vb_lock);
872
873 q->ops->buf_setup(q, &nbufs, &size);
874
875 if (NULL == q->read_buf &&
876 count >= size &&
877 !nonblocking) {
878 retval = videobuf_read_zerocopy(q, data, count, ppos);
879 if (retval >= 0 || retval == -EIO)
880 /* ok, all done */
881 goto done;
882 /* fallback to kernel bounce buffer on failures */
883 }
884
885 if (NULL == q->read_buf) {
886 /* need to capture a new frame */
887 retval = -ENOMEM;
888 q->read_buf = videobuf_alloc_vb(q);
889
890 dprintk(1, "video alloc=0x%p\n", q->read_buf);
891 if (NULL == q->read_buf)
892 goto done;
893 q->read_buf->memory = V4L2_MEMORY_USERPTR;
894 q->read_buf->bsize = count; /* preferred size */
895 field = videobuf_next_field(q);
896 retval = q->ops->buf_prepare(q, q->read_buf, field);
897
898 if (0 != retval) {
899 kfree(q->read_buf);
900 q->read_buf = NULL;
901 goto done;
902 }
903
904 spin_lock_irqsave(q->irqlock, flags);
905 q->ops->buf_queue(q, q->read_buf);
906 spin_unlock_irqrestore(q->irqlock, flags);
907
908 q->read_off = 0;
909 }
910
911 /* wait until capture is done */
912 retval = videobuf_waiton(q->read_buf, nonblocking, 1);
913 if (0 != retval)
914 goto done;
915
916 CALL(q, sync, q, q->read_buf);
917
918 if (VIDEOBUF_ERROR == q->read_buf->state) {
919 /* catch I/O errors */
920 q->ops->buf_release(q, q->read_buf);
921 kfree(q->read_buf);
922 q->read_buf = NULL;
923 retval = -EIO;
924 goto done;
925 }
926
927 /* Copy to userspace */
928 retval = __videobuf_copy_to_user(q, q->read_buf, data, count, nonblocking);
929 if (retval < 0)
930 goto done;
931
932 q->read_off += retval;
933 if (q->read_off == q->read_buf->size) {
934 /* all data copied, cleanup */
935 q->ops->buf_release(q, q->read_buf);
936 kfree(q->read_buf);
937 q->read_buf = NULL;
938 }
939
940 done:
941 mutex_unlock(&q->vb_lock);
942 return retval;
943 }
944 EXPORT_SYMBOL_GPL(videobuf_read_one);
945
946 /* Locking: Caller holds q->vb_lock */
947 static int __videobuf_read_start(struct videobuf_queue *q)
948 {
949 enum v4l2_field field;
950 unsigned long flags = 0;
951 unsigned int count = 0, size = 0;
952 int err, i;
953
954 q->ops->buf_setup(q, &count, &size);
955 if (count < 2)
956 count = 2;
957 if (count > VIDEO_MAX_FRAME)
958 count = VIDEO_MAX_FRAME;
959 size = PAGE_ALIGN(size);
960
961 err = __videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR);
962 if (err < 0)
963 return err;
964
965 count = err;
966
967 for (i = 0; i < count; i++) {
968 field = videobuf_next_field(q);
969 err = q->ops->buf_prepare(q, q->bufs[i], field);
970 if (err)
971 return err;
972 list_add_tail(&q->bufs[i]->stream, &q->stream);
973 }
974 spin_lock_irqsave(q->irqlock, flags);
975 for (i = 0; i < count; i++)
976 q->ops->buf_queue(q, q->bufs[i]);
977 spin_unlock_irqrestore(q->irqlock, flags);
978 q->reading = 1;
979 return 0;
980 }
981
982 static void __videobuf_read_stop(struct videobuf_queue *q)
983 {
984 int i;
985
986 videobuf_queue_cancel(q);
987 __videobuf_free(q);
988 INIT_LIST_HEAD(&q->stream);
989 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
990 if (NULL == q->bufs[i])
991 continue;
992 kfree(q->bufs[i]);
993 q->bufs[i] = NULL;
994 }
995 q->read_buf = NULL;
996 }
997
998 int videobuf_read_start(struct videobuf_queue *q)
999 {
1000 int rc;
1001
1002 mutex_lock(&q->vb_lock);
1003 rc = __videobuf_read_start(q);
1004 mutex_unlock(&q->vb_lock);
1005
1006 return rc;
1007 }
1008 EXPORT_SYMBOL_GPL(videobuf_read_start);
1009
1010 void videobuf_read_stop(struct videobuf_queue *q)
1011 {
1012 mutex_lock(&q->vb_lock);
1013 __videobuf_read_stop(q);
1014 mutex_unlock(&q->vb_lock);
1015 }
1016 EXPORT_SYMBOL_GPL(videobuf_read_stop);
1017
1018 void videobuf_stop(struct videobuf_queue *q)
1019 {
1020 mutex_lock(&q->vb_lock);
1021
1022 if (q->streaming)
1023 __videobuf_streamoff(q);
1024
1025 if (q->reading)
1026 __videobuf_read_stop(q);
1027
1028 mutex_unlock(&q->vb_lock);
1029 }
1030 EXPORT_SYMBOL_GPL(videobuf_stop);
1031
1032 ssize_t videobuf_read_stream(struct videobuf_queue *q,
1033 char __user *data, size_t count, loff_t *ppos,
1034 int vbihack, int nonblocking)
1035 {
1036 int rc, retval;
1037 unsigned long flags = 0;
1038
1039 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
1040
1041 dprintk(2, "%s\n", __func__);
1042 mutex_lock(&q->vb_lock);
1043 retval = -EBUSY;
1044 if (q->streaming)
1045 goto done;
1046 if (!q->reading) {
1047 retval = __videobuf_read_start(q);
1048 if (retval < 0)
1049 goto done;
1050 }
1051
1052 retval = 0;
1053 while (count > 0) {
1054 /* get / wait for data */
1055 if (NULL == q->read_buf) {
1056 q->read_buf = list_entry(q->stream.next,
1057 struct videobuf_buffer,
1058 stream);
1059 list_del(&q->read_buf->stream);
1060 q->read_off = 0;
1061 }
1062 rc = videobuf_waiton(q->read_buf, nonblocking, 1);
1063 if (rc < 0) {
1064 if (0 == retval)
1065 retval = rc;
1066 break;
1067 }
1068
1069 if (q->read_buf->state == VIDEOBUF_DONE) {
1070 rc = __videobuf_copy_stream(q, q->read_buf, data + retval, count,
1071 retval, vbihack, nonblocking);
1072 if (rc < 0) {
1073 retval = rc;
1074 break;
1075 }
1076 retval += rc;
1077 count -= rc;
1078 q->read_off += rc;
1079 } else {
1080 /* some error */
1081 q->read_off = q->read_buf->size;
1082 if (0 == retval)
1083 retval = -EIO;
1084 }
1085
1086 /* requeue buffer when done with copying */
1087 if (q->read_off == q->read_buf->size) {
1088 list_add_tail(&q->read_buf->stream,
1089 &q->stream);
1090 spin_lock_irqsave(q->irqlock, flags);
1091 q->ops->buf_queue(q, q->read_buf);
1092 spin_unlock_irqrestore(q->irqlock, flags);
1093 q->read_buf = NULL;
1094 }
1095 if (retval < 0)
1096 break;
1097 }
1098
1099 done:
1100 mutex_unlock(&q->vb_lock);
1101 return retval;
1102 }
1103 EXPORT_SYMBOL_GPL(videobuf_read_stream);
1104
1105 unsigned int videobuf_poll_stream(struct file *file,
1106 struct videobuf_queue *q,
1107 poll_table *wait)
1108 {
1109 struct videobuf_buffer *buf = NULL;
1110 unsigned int rc = 0;
1111
1112 mutex_lock(&q->vb_lock);
1113 if (q->streaming) {
1114 if (!list_empty(&q->stream))
1115 buf = list_entry(q->stream.next,
1116 struct videobuf_buffer, stream);
1117 } else {
1118 if (!q->reading)
1119 __videobuf_read_start(q);
1120 if (!q->reading) {
1121 rc = POLLERR;
1122 } else if (NULL == q->read_buf) {
1123 q->read_buf = list_entry(q->stream.next,
1124 struct videobuf_buffer,
1125 stream);
1126 list_del(&q->read_buf->stream);
1127 q->read_off = 0;
1128 }
1129 buf = q->read_buf;
1130 }
1131 if (!buf)
1132 rc = POLLERR;
1133
1134 if (0 == rc) {
1135 poll_wait(file, &buf->done, wait);
1136 if (buf->state == VIDEOBUF_DONE ||
1137 buf->state == VIDEOBUF_ERROR) {
1138 switch (q->type) {
1139 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1140 case V4L2_BUF_TYPE_VBI_OUTPUT:
1141 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
1142 rc = POLLOUT | POLLWRNORM;
1143 break;
1144 default:
1145 rc = POLLIN | POLLRDNORM;
1146 break;
1147 }
1148 }
1149 }
1150 mutex_unlock(&q->vb_lock);
1151 return rc;
1152 }
1153 EXPORT_SYMBOL_GPL(videobuf_poll_stream);
1154
1155 int videobuf_mmap_mapper(struct videobuf_queue *q, struct vm_area_struct *vma)
1156 {
1157 int rc = -EINVAL;
1158 int i;
1159
1160 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
1161
1162 if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED)) {
1163 dprintk(1, "mmap appl bug: PROT_WRITE and MAP_SHARED are required\n");
1164 return -EINVAL;
1165 }
1166
1167 mutex_lock(&q->vb_lock);
1168 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1169 struct videobuf_buffer *buf = q->bufs[i];
1170
1171 if (buf && buf->memory == V4L2_MEMORY_MMAP &&
1172 buf->boff == (vma->vm_pgoff << PAGE_SHIFT)) {
1173 rc = CALL(q, mmap_mapper, q, buf, vma);
1174 break;
1175 }
1176 }
1177 mutex_unlock(&q->vb_lock);
1178
1179 return rc;
1180 }
1181 EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);
1182
1183 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1184 int videobuf_cgmbuf(struct videobuf_queue *q,
1185 struct video_mbuf *mbuf, int count)
1186 {
1187 struct v4l2_requestbuffers req;
1188 int rc, i;
1189
1190 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
1191
1192 memset(&req, 0, sizeof(req));
1193 req.type = q->type;
1194 req.count = count;
1195 req.memory = V4L2_MEMORY_MMAP;
1196 rc = videobuf_reqbufs(q, &req);
1197 if (rc < 0)
1198 return rc;
1199
1200 mbuf->frames = req.count;
1201 mbuf->size = 0;
1202 for (i = 0; i < mbuf->frames; i++) {
1203 mbuf->offsets[i] = q->bufs[i]->boff;
1204 mbuf->size += PAGE_ALIGN(q->bufs[i]->bsize);
1205 }
1206
1207 return 0;
1208 }
1209 EXPORT_SYMBOL_GPL(videobuf_cgmbuf);
1210 #endif
Tomato firmware and modifications.