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Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6
[deliverable/linux.git] / drivers / media / video / videobuf-core.c
CommitLineData
7a7d9a89
MCC		 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/slab.h>
20#include <linux/interrupt.h>
21
22#include <media/videobuf-core.h>
23
24#define MAGIC_BUFFER 0x20070728
25#define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \
26 { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }
27
28static int debug = 0;
29module_param(debug, int, 0644);
30
31MODULE_DESCRIPTION("helper module to manage video4linux buffers");
32MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
33MODULE_LICENSE("GPL");
34
35#define dprintk(level, fmt, arg...) if (debug >= level) \
36 printk(KERN_DEBUG "vbuf: " fmt , ## arg)
37
38/* --------------------------------------------------------------------- */
39
40#define CALL(q, f, arg...) \
41 ( (q->int_ops->f)? q->int_ops->f(arg) : 0)
42
43void* videobuf_alloc(struct videobuf_queue* q)
44{
45 struct videobuf_buffer *vb;
46
47 BUG_ON (q->msize<sizeof(*vb));
48
49 if (!q->int_ops || !q->int_ops->alloc) {
50 printk(KERN_ERR "No specific ops defined!\n");
51 BUG();
52 }
53
54 vb = q->int_ops->alloc(q->msize);
55
56 if (NULL != vb) {
57 init_waitqueue_head(&vb->done);
58 vb->magic = MAGIC_BUFFER;
59 }
60
61 return vb;
62}
63
64int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr)
65{
66 int retval = 0;
67 DECLARE_WAITQUEUE(wait, current);
68
69 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
70 add_wait_queue(&vb->done, &wait);
71 while (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) {
72 if (non_blocking) {
73 retval = -EAGAIN;
74 break;
75 }
76 set_current_state(intr ? TASK_INTERRUPTIBLE
77 : TASK_UNINTERRUPTIBLE);
78 if (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED)
79 schedule();
80 set_current_state(TASK_RUNNING);
81 if (intr && signal_pending(current)) {
82 dprintk(1,"buffer waiton: -EINTR\n");
83 retval = -EINTR;
84 break;
85 }
86 }
87 remove_wait_queue(&vb->done, &wait);
88 return retval;
89}
90
91int videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb,
92 struct v4l2_framebuffer *fbuf)
93{
94 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
95 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
96
d5f1b016
MCC		 97 /* FIXME: This is required to avoid OOPS on some cases, since mmap_mapper()
98 method should be called before _iolock.
99 On some cases, the mmap_mapper() is called only after scheduling.
100
101 However, this way is just too dirty! Better to wait for some event.
102 */
103 schedule_timeout(HZ);
104
7a7d9a89
MCC		 105 return CALL(q,iolock,q,vb,fbuf);
106}
107
108/* --------------------------------------------------------------------- */
109
110
d4cae5a5 111void videobuf_queue_core_init(struct videobuf_queue* q,
7a7d9a89
MCC		 112 struct videobuf_queue_ops *ops,
113 void *dev,
114 spinlock_t *irqlock,
115 enum v4l2_buf_type type,
116 enum v4l2_field field,
117 unsigned int msize,
d4cae5a5
MCC		 118 void *priv,
119 struct videobuf_qtype_ops *int_ops)
7a7d9a89
MCC		 120{
121 memset(q,0,sizeof(*q));
d4cae5a5
MCC		 122 q->irqlock = irqlock;
123 q->dev = dev;
124 q->type = type;
125 q->field = field;
126 q->msize = msize;
127 q->ops = ops;
7a7d9a89 128 q->priv_data = priv;
d4cae5a5 129 q->int_ops = int_ops;
7a7d9a89
MCC		 130
131 /* All buffer operations are mandatory */
132 BUG_ON (!q->ops->buf_setup);
133 BUG_ON (!q->ops->buf_prepare);
134 BUG_ON (!q->ops->buf_queue);
135 BUG_ON (!q->ops->buf_release);
136
d4cae5a5
MCC		 137 /* Having implementations for abstract methods are mandatory */
138 BUG_ON (!q->int_ops);
139
7a7d9a89
MCC		 140 mutex_init(&q->lock);
141 INIT_LIST_HEAD(&q->stream);
142}
143
19bc5133 144/* Locking: Only usage in bttv unsafe find way to remove */
7a7d9a89
MCC		 145int videobuf_queue_is_busy(struct videobuf_queue *q)
146{
147 int i;
148
149 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
150
151 if (q->streaming) {
152 dprintk(1,"busy: streaming active\n");
153 return 1;
154 }
155 if (q->reading) {
156 dprintk(1,"busy: pending read #1\n");
157 return 1;
158 }
159 if (q->read_buf) {
160 dprintk(1,"busy: pending read #2\n");
161 return 1;
162 }
163 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
164 if (NULL == q->bufs[i])
165 continue;
851c0c96 166 if (q->bufs[i]->map) {
7a7d9a89
MCC		 167 dprintk(1,"busy: buffer #%d mapped\n",i);
168 return 1;
169 }
170 if (q->bufs[i]->state == STATE_QUEUED) {
171 dprintk(1,"busy: buffer #%d queued\n",i);
172 return 1;
173 }
174 if (q->bufs[i]->state == STATE_ACTIVE) {
175 dprintk(1,"busy: buffer #%d avtive\n",i);
176 return 1;
177 }
178 }
179 return 0;
180}
181
19bc5133 182/* Locking: Caller holds q->lock */
7a7d9a89
MCC		 183void videobuf_queue_cancel(struct videobuf_queue *q)
184{
185 unsigned long flags=0;
186 int i;
187
188 /* remove queued buffers from list */
189 if (q->irqlock)
190 spin_lock_irqsave(q->irqlock,flags);
191 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
192 if (NULL == q->bufs[i])
193 continue;
194 if (q->bufs[i]->state == STATE_QUEUED) {
195 list_del(&q->bufs[i]->queue);
196 q->bufs[i]->state = STATE_ERROR;
197 }
198 }
199 if (q->irqlock)
200 spin_unlock_irqrestore(q->irqlock,flags);
201
202 /* free all buffers + clear queue */
203 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
204 if (NULL == q->bufs[i])
205 continue;
206 q->ops->buf_release(q,q->bufs[i]);
207 }
208 INIT_LIST_HEAD(&q->stream);
209}
210
211/* --------------------------------------------------------------------- */
212
19bc5133 213/* Locking: Caller holds q->lock */
7a7d9a89
MCC		 214enum v4l2_field videobuf_next_field(struct videobuf_queue *q)
215{
216 enum v4l2_field field = q->field;
217
218 BUG_ON(V4L2_FIELD_ANY == field);
219
220 if (V4L2_FIELD_ALTERNATE == field) {
221 if (V4L2_FIELD_TOP == q->last) {
222 field = V4L2_FIELD_BOTTOM;
223 q->last = V4L2_FIELD_BOTTOM;
224 } else {
225 field = V4L2_FIELD_TOP;
226 q->last = V4L2_FIELD_TOP;
227 }
228 }
229 return field;
230}
231
19bc5133 232/* Locking: Caller holds q->lock */
7a7d9a89
MCC		 233static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b,
234 struct videobuf_buffer *vb, enum v4l2_buf_type type)
235{
236 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
237 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
238
239 b->index = vb->i;
240 b->type = type;
241
242 b->memory = vb->memory;
243 switch (b->memory) {
244 case V4L2_MEMORY_MMAP:
245 b->m.offset = vb->boff;
246 b->length = vb->bsize;
247 break;
248 case V4L2_MEMORY_USERPTR:
249 b->m.userptr = vb->baddr;
250 b->length = vb->bsize;
251 break;
252 case V4L2_MEMORY_OVERLAY:
253 b->m.offset = vb->boff;
254 break;
255 }
256
257 b->flags = 0;
851c0c96 258 if (vb->map)
7a7d9a89
MCC		 259 b->flags |= V4L2_BUF_FLAG_MAPPED;
260
261 switch (vb->state) {
262 case STATE_PREPARED:
263 case STATE_QUEUED:
264 case STATE_ACTIVE:
265 b->flags |= V4L2_BUF_FLAG_QUEUED;
266 break;
267 case STATE_DONE:
268 case STATE_ERROR:
269 b->flags |= V4L2_BUF_FLAG_DONE;
270 break;
271 case STATE_NEEDS_INIT:
272 case STATE_IDLE:
273 /* nothing */
274 break;
275 }
276
277 if (vb->input != UNSET) {
278 b->flags |= V4L2_BUF_FLAG_INPUT;
279 b->input = vb->input;
280 }
281
282 b->field = vb->field;
283 b->timestamp = vb->ts;
284 b->bytesused = vb->size;
285 b->sequence = vb->field_count >> 1;
286}
287
19bc5133
BP		 288/* Locking: Caller holds q->lock */
289static int __videobuf_mmap_free(struct videobuf_queue *q)
290{
291 int i;
292 int rc;
293
294 if (!q)
295 return 0;
296
297 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
298
299 rc = CALL(q,mmap_free,q);
300 if (rc<0)
301 return rc;
302
303 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
304 if (NULL == q->bufs[i])
305 continue;
306 q->ops->buf_release(q,q->bufs[i]);
307 kfree(q->bufs[i]);
308 q->bufs[i] = NULL;
309 }
310
311 return rc;
312}
313
314int videobuf_mmap_free(struct videobuf_queue *q)
315{
316 int ret;
317 mutex_lock(&q->lock);
318 ret = __videobuf_mmap_free(q);
319 mutex_unlock(&q->lock);
320 return ret;
321}
322
323/* Locking: Caller holds q->lock */
324static int __videobuf_mmap_setup(struct videobuf_queue *q,
325 unsigned int bcount, unsigned int bsize,
326 enum v4l2_memory memory)
327{
328 unsigned int i;
329 int err;
330
331 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
332
333 err = __videobuf_mmap_free(q);
334 if (0 != err)
335 return err;
336
337 /* Allocate and initialize buffers */
338 for (i = 0; i < bcount; i++) {
339 q->bufs[i] = videobuf_alloc(q);
340
341 if (q->bufs[i] == NULL)
342 break;
343
344 q->bufs[i]->i = i;
345 q->bufs[i]->input = UNSET;
346 q->bufs[i]->memory = memory;
347 q->bufs[i]->bsize = bsize;
348 switch (memory) {
349 case V4L2_MEMORY_MMAP:
350 q->bufs[i]->boff = bsize * i;
351 break;
352 case V4L2_MEMORY_USERPTR:
353 case V4L2_MEMORY_OVERLAY:
354 /* nothing */
355 break;
356 }
357 }
358
359 if (!i)
360 return -ENOMEM;
361
362 dprintk(1,"mmap setup: %d buffers, %d bytes each\n",
363 i, bsize);
364
365 return i;
366}
367
368int videobuf_mmap_setup(struct videobuf_queue *q,
369 unsigned int bcount, unsigned int bsize,
370 enum v4l2_memory memory)
371{
372 int ret;
373 mutex_lock(&q->lock);
374 ret = __videobuf_mmap_setup(q, bcount, bsize, memory);
375 mutex_unlock(&q->lock);
376 return ret;
377}
378
7a7d9a89
MCC		 379int videobuf_reqbufs(struct videobuf_queue *q,
380 struct v4l2_requestbuffers *req)
381{
382 unsigned int size,count;
383 int retval;
384
7a7d9a89
MCC		 385 if (req->count < 1) {
386 dprintk(1,"reqbufs: count invalid (%d)\n",req->count);
387 return -EINVAL;
388 }
19bc5133 389
7a7d9a89
MCC		 390 if (req->memory != V4L2_MEMORY_MMAP &&
391 req->memory != V4L2_MEMORY_USERPTR &&
392 req->memory != V4L2_MEMORY_OVERLAY) {
393 dprintk(1,"reqbufs: memory type invalid\n");
394 return -EINVAL;
395 }
396
00f98d08 397 mutex_lock(&q->lock);
19bc5133
BP		 398 if (req->type != q->type) {
399 dprintk(1,"reqbufs: queue type invalid\n");
400 retval = -EINVAL;
401 goto done;
402 }
403
7a7d9a89
MCC		 404 if (q->streaming) {
405 dprintk(1,"reqbufs: streaming already exists\n");
00f98d08
BP		 406 retval = -EBUSY;
407 goto done;
7a7d9a89
MCC		 408 }
409 if (!list_empty(&q->stream)) {
410 dprintk(1,"reqbufs: stream running\n");
00f98d08
BP		 411 retval = -EBUSY;
412 goto done;
7a7d9a89
MCC		 413 }
414
7a7d9a89
MCC		 415 count = req->count;
416 if (count > VIDEO_MAX_FRAME)
417 count = VIDEO_MAX_FRAME;
418 size = 0;
419 q->ops->buf_setup(q,&count,&size);
420 size = PAGE_ALIGN(size);
421 dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n",
422 count, size, (count*size)>>PAGE_SHIFT);
423
19bc5133 424 retval = __videobuf_mmap_setup(q,count,size,req->memory);
7a7d9a89
MCC		 425 if (retval < 0) {
426 dprintk(1,"reqbufs: mmap setup returned %d\n",retval);
427 goto done;
428 }
429
49ee718e 430 req->count = retval;
7a7d9a89
MCC		 431
432 done:
433 mutex_unlock(&q->lock);
434 return retval;
435}
436
437int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
438{
19bc5133
BP		 439 int ret = -EINVAL;
440
441 mutex_lock(&q->lock);
7a7d9a89
MCC		 442 if (unlikely(b->type != q->type)) {
443 dprintk(1,"querybuf: Wrong type.\n");
19bc5133 444 goto done;
7a7d9a89
MCC		 445 }
446 if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) {
447 dprintk(1,"querybuf: index out of range.\n");
19bc5133 448 goto done;
7a7d9a89
MCC		 449 }
450 if (unlikely(NULL == q->bufs[b->index])) {
451 dprintk(1,"querybuf: buffer is null.\n");
19bc5133 452 goto done;
7a7d9a89 453 }
19bc5133 454
7a7d9a89 455 videobuf_status(q,b,q->bufs[b->index],q->type);
19bc5133
BP		 456
457 ret = 0;
458done:
459 mutex_unlock(&q->lock);
460 return ret;
7a7d9a89
MCC		 461}
462
463int videobuf_qbuf(struct videobuf_queue *q,
464 struct v4l2_buffer *b)
465{
466 struct videobuf_buffer *buf;
467 enum v4l2_field field;
468 unsigned long flags=0;
469 int retval;
470
471 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
472
9900132f
ML		 473 if (b->memory == V4L2_MEMORY_MMAP)
474 down_read(&current->mm->mmap_sem);
475
7a7d9a89
MCC		 476 mutex_lock(&q->lock);
477 retval = -EBUSY;
478 if (q->reading) {
479 dprintk(1,"qbuf: Reading running...\n");
480 goto done;
481 }
482 retval = -EINVAL;
483 if (b->type != q->type) {
484 dprintk(1,"qbuf: Wrong type.\n");
485 goto done;
486 }
487 if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) {
488 dprintk(1,"qbuf: index out of range.\n");
489 goto done;
490 }
491 buf = q->bufs[b->index];
492 if (NULL == buf) {
493 dprintk(1,"qbuf: buffer is null.\n");
494 goto done;
495 }
496 MAGIC_CHECK(buf->magic,MAGIC_BUFFER);
497 if (buf->memory != b->memory) {
498 dprintk(1,"qbuf: memory type is wrong.\n");
499 goto done;
500 }
501 if (buf->state != STATE_NEEDS_INIT && buf->state != STATE_IDLE) {
502 dprintk(1,"qbuf: buffer is already queued or active.\n");
503 goto done;
504 }
505
506 if (b->flags & V4L2_BUF_FLAG_INPUT) {
507 if (b->input >= q->inputs) {
508 dprintk(1,"qbuf: wrong input.\n");
509 goto done;
510 }
511 buf->input = b->input;
512 } else {
513 buf->input = UNSET;
514 }
515
516 switch (b->memory) {
517 case V4L2_MEMORY_MMAP:
518 if (0 == buf->baddr) {
519 dprintk(1,"qbuf: mmap requested but buffer addr is zero!\n");
520 goto done;
521 }
522 break;
523 case V4L2_MEMORY_USERPTR:
524 if (b->length < buf->bsize) {
525 dprintk(1,"qbuf: buffer length is not enough\n");
526 goto done;
527 }
528 if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr)
529 q->ops->buf_release(q,buf);
530 buf->baddr = b->m.userptr;
531 break;
532 case V4L2_MEMORY_OVERLAY:
533 buf->boff = b->m.offset;
534 break;
535 default:
536 dprintk(1,"qbuf: wrong memory type\n");
537 goto done;
538 }
539
540 dprintk(1,"qbuf: requesting next field\n");
541 field = videobuf_next_field(q);
542 retval = q->ops->buf_prepare(q,buf,field);
543 if (0 != retval) {
544 dprintk(1,"qbuf: buffer_prepare returned %d\n",retval);
545 goto done;
546 }
547
548 list_add_tail(&buf->stream,&q->stream);
549 if (q->streaming) {
550 if (q->irqlock)
551 spin_lock_irqsave(q->irqlock,flags);
552 q->ops->buf_queue(q,buf);
553 if (q->irqlock)
554 spin_unlock_irqrestore(q->irqlock,flags);
555 }
556 dprintk(1,"qbuf: succeded\n");
557 retval = 0;
558
559 done:
560 mutex_unlock(&q->lock);
9900132f
ML		 561
562 if (b->memory == V4L2_MEMORY_MMAP)
563 up_read(&current->mm->mmap_sem);
564
7a7d9a89
MCC		 565 return retval;
566}
567
568int videobuf_dqbuf(struct videobuf_queue *q,
569 struct v4l2_buffer *b, int nonblocking)
570{
571 struct videobuf_buffer *buf;
572 int retval;
573
574 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
575
576 mutex_lock(&q->lock);
577 retval = -EBUSY;
578 if (q->reading) {
579 dprintk(1,"dqbuf: Reading running...\n");
580 goto done;
581 }
582 retval = -EINVAL;
583 if (b->type != q->type) {
584 dprintk(1,"dqbuf: Wrong type.\n");
585 goto done;
586 }
587 if (list_empty(&q->stream)) {
588 dprintk(1,"dqbuf: stream running\n");
589 goto done;
590 }
591 buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
592 retval = videobuf_waiton(buf, nonblocking, 1);
593 if (retval < 0) {
594 dprintk(1,"dqbuf: waiton returned %d\n",retval);
595 goto done;
596 }
597 switch (buf->state) {
598 case STATE_ERROR:
599 dprintk(1,"dqbuf: state is error\n");
600 retval = -EIO;
601 CALL(q,sync,q, buf);
602 buf->state = STATE_IDLE;
603 break;
604 case STATE_DONE:
605 dprintk(1,"dqbuf: state is done\n");
606 CALL(q,sync,q, buf);
607 buf->state = STATE_IDLE;
608 break;
609 default:
610 dprintk(1,"dqbuf: state invalid\n");
611 retval = -EINVAL;
612 goto done;
613 }
614 list_del(&buf->stream);
615 memset(b,0,sizeof(*b));
616 videobuf_status(q,b,buf,q->type);
617
618 done:
619 mutex_unlock(&q->lock);
620 return retval;
621}
622
623int videobuf_streamon(struct videobuf_queue *q)
624{
625 struct videobuf_buffer *buf;
7a7d9a89
MCC		 626 unsigned long flags=0;
627 int retval;
628
629 mutex_lock(&q->lock);
630 retval = -EBUSY;
631 if (q->reading)
632 goto done;
633 retval = 0;
634 if (q->streaming)
635 goto done;
636 q->streaming = 1;
637 if (q->irqlock)
638 spin_lock_irqsave(q->irqlock,flags);
a991f44b 639 list_for_each_entry(buf, &q->stream, stream)
7a7d9a89
MCC		 640 if (buf->state == STATE_PREPARED)
641 q->ops->buf_queue(q,buf);
7a7d9a89
MCC		 642 if (q->irqlock)
643 spin_unlock_irqrestore(q->irqlock,flags);
644
645 done:
646 mutex_unlock(&q->lock);
647 return retval;
648}
649
19bc5133
BP		 650/* Locking: Caller holds q->lock */
651static int __videobuf_streamoff(struct videobuf_queue *q)
7a7d9a89 652{
7a7d9a89 653 if (!q->streaming)
19bc5133
BP		 654 return -EINVAL;
655
7a7d9a89
MCC		 656 videobuf_queue_cancel(q);
657 q->streaming = 0;
7a7d9a89 658
19bc5133
BP		 659 return 0;
660}
661
662int videobuf_streamoff(struct videobuf_queue *q)
663{
664 int retval;
665
666 mutex_lock(&q->lock);
667 retval = __videobuf_streamoff(q);
7a7d9a89 668 mutex_unlock(&q->lock);
19bc5133 669
7a7d9a89
MCC		 670 return retval;
671}
672
19bc5133 673/* Locking: Caller holds q->lock */
7a7d9a89
MCC		 674static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q,
675 char __user *data,
676 size_t count, loff_t *ppos)
677{
678 enum v4l2_field field;
679 unsigned long flags=0;
680 int retval;
681
682 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
683
684 /* setup stuff */
685 q->read_buf = videobuf_alloc(q);
686 if (NULL == q->read_buf)
687 return -ENOMEM;
688
689 q->read_buf->memory = V4L2_MEMORY_USERPTR;
690 q->read_buf->baddr = (unsigned long)data;
691 q->read_buf->bsize = count;
692
693 field = videobuf_next_field(q);
694 retval = q->ops->buf_prepare(q,q->read_buf,field);
695 if (0 != retval)
696 goto done;
697
698 /* start capture & wait */
699 if (q->irqlock)
700 spin_lock_irqsave(q->irqlock,flags);
701 q->ops->buf_queue(q,q->read_buf);
702 if (q->irqlock)
703 spin_unlock_irqrestore(q->irqlock,flags);
704 retval = videobuf_waiton(q->read_buf,0,0);
705 if (0 == retval) {
706 CALL(q,sync,q,q->read_buf);
707 if (STATE_ERROR == q->read_buf->state)
708 retval = -EIO;
709 else
710 retval = q->read_buf->size;
711 }
712
713 done:
714 /* cleanup */
715 q->ops->buf_release(q,q->read_buf);
716 kfree(q->read_buf);
717 q->read_buf = NULL;
718 return retval;
719}
720
721ssize_t videobuf_read_one(struct videobuf_queue *q,
722 char __user *data, size_t count, loff_t *ppos,
723 int nonblocking)
724{
725 enum v4l2_field field;
726 unsigned long flags=0;
727 unsigned size, nbufs;
728 int retval;
729
730 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
731
732 mutex_lock(&q->lock);
733
734 nbufs = 1; size = 0;
735 q->ops->buf_setup(q,&nbufs,&size);
736
737 if (NULL == q->read_buf &&
738 count >= size &&
739 !nonblocking) {
740 retval = videobuf_read_zerocopy(q,data,count,ppos);
741 if (retval >= 0 || retval == -EIO)
742 /* ok, all done */
743 goto done;
744 /* fallback to kernel bounce buffer on failures */
745 }
746
747 if (NULL == q->read_buf) {
748 /* need to capture a new frame */
749 retval = -ENOMEM;
750 q->read_buf = videobuf_alloc(q);
751
752 dprintk(1,"video alloc=0x%p\n", q->read_buf);
753 if (NULL == q->read_buf)
754 goto done;
755 q->read_buf->memory = V4L2_MEMORY_USERPTR;
756 q->read_buf->bsize = count; /* preferred size */
757 field = videobuf_next_field(q);
758 retval = q->ops->buf_prepare(q,q->read_buf,field);
759
760 if (0 != retval) {
761 kfree (q->read_buf);
762 q->read_buf = NULL;
763 goto done;
764 }
765 if (q->irqlock)
766 spin_lock_irqsave(q->irqlock,flags);
767
768 q->ops->buf_queue(q,q->read_buf);
769 if (q->irqlock)
770 spin_unlock_irqrestore(q->irqlock,flags);
771 q->read_off = 0;
772 }
773
774 /* wait until capture is done */
775 retval = videobuf_waiton(q->read_buf, nonblocking, 1);
776 if (0 != retval)
777 goto done;
778
779 CALL(q,sync,q,q->read_buf);
780
781 if (STATE_ERROR == q->read_buf->state) {
782 /* catch I/O errors */
783 q->ops->buf_release(q,q->read_buf);
784 kfree(q->read_buf);
785 q->read_buf = NULL;
786 retval = -EIO;
787 goto done;
788 }
789
790 /* Copy to userspace */
13bcd5d0 791 retval=CALL(q,video_copy_to_user,q,data,count,nonblocking);
7a7d9a89
MCC		 792 if (retval<0)
793 goto done;
794
795 q->read_off += retval;
796 if (q->read_off == q->read_buf->size) {
797 /* all data copied, cleanup */
798 q->ops->buf_release(q,q->read_buf);
799 kfree(q->read_buf);
800 q->read_buf = NULL;
801 }
802
803 done:
804 mutex_unlock(&q->lock);
805 return retval;
806}
807
19bc5133 808/* Locking: Caller holds q->lock */
19fb1457 809int __videobuf_read_start(struct videobuf_queue *q)
7a7d9a89
MCC		 810{
811 enum v4l2_field field;
812 unsigned long flags=0;
49ee718e 813 unsigned int count = 0, size = 0;
7a7d9a89
MCC		 814 int err, i;
815
816 q->ops->buf_setup(q,&count,&size);
817 if (count < 2)
818 count = 2;
819 if (count > VIDEO_MAX_FRAME)
820 count = VIDEO_MAX_FRAME;
821 size = PAGE_ALIGN(size);
822
19bc5133 823 err = __videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR);
49ee718e 824 if (err < 0)
7a7d9a89
MCC		 825 return err;
826
49ee718e
BP		 827 count = err;
828
7a7d9a89
MCC		 829 for (i = 0; i < count; i++) {
830 field = videobuf_next_field(q);
831 err = q->ops->buf_prepare(q,q->bufs[i],field);
832 if (err)
833 return err;
834 list_add_tail(&q->bufs[i]->stream, &q->stream);
835 }
836 if (q->irqlock)
837 spin_lock_irqsave(q->irqlock,flags);
838 for (i = 0; i < count; i++)
839 q->ops->buf_queue(q,q->bufs[i]);
840 if (q->irqlock)
841 spin_unlock_irqrestore(q->irqlock,flags);
842 q->reading = 1;
843 return 0;
844}
845
19bc5133 846static void __videobuf_read_stop(struct videobuf_queue *q)
7a7d9a89
MCC		 847{
848 int i;
849
19bc5133 850
7a7d9a89 851 videobuf_queue_cancel(q);
19bc5133 852 __videobuf_mmap_free(q);
7a7d9a89
MCC		 853 INIT_LIST_HEAD(&q->stream);
854 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
855 if (NULL == q->bufs[i])
856 continue;
857 kfree(q->bufs[i]);
858 q->bufs[i] = NULL;
859 }
860 q->read_buf = NULL;
861 q->reading = 0;
19bc5133
BP		 862
863}
864
19fb1457
MCC		 865int videobuf_read_start(struct videobuf_queue *q)
866{
867 int rc;
868
869 mutex_lock(&q->lock);
870 rc = __videobuf_read_start(q);
871 mutex_unlock(&q->lock);
872
873 return rc;
874}
875
19bc5133
BP		 876void videobuf_read_stop(struct videobuf_queue *q)
877{
878 mutex_lock(&q->lock);
879 __videobuf_read_stop(q);
880 mutex_unlock(&q->lock);
881}
882
883void videobuf_stop(struct videobuf_queue *q)
884{
885 mutex_lock(&q->lock);
886
887 if (q->streaming)
888 __videobuf_streamoff(q);
889
890 if (q->reading)
891 __videobuf_read_stop(q);
892
893 mutex_unlock(&q->lock);
7a7d9a89
MCC		 894}
895
19bc5133 896
7a7d9a89
MCC		 897ssize_t videobuf_read_stream(struct videobuf_queue *q,
898 char __user *data, size_t count, loff_t *ppos,
899 int vbihack, int nonblocking)
900{
901 int rc, retval;
902 unsigned long flags=0;
903
904 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
905
906 dprintk(2,"%s\n",__FUNCTION__);
907 mutex_lock(&q->lock);
908 retval = -EBUSY;
909 if (q->streaming)
910 goto done;
911 if (!q->reading) {
912 retval = videobuf_read_start(q);
913 if (retval < 0)
914 goto done;
915 }
916
917 retval = 0;
918 while (count > 0) {
919 /* get / wait for data */
920 if (NULL == q->read_buf) {
921 q->read_buf = list_entry(q->stream.next,
922 struct videobuf_buffer,
923 stream);
924 list_del(&q->read_buf->stream);
925 q->read_off = 0;
926 }
927 rc = videobuf_waiton(q->read_buf, nonblocking, 1);
928 if (rc < 0) {
929 if (0 == retval)
930 retval = rc;
931 break;
932 }
933
934 if (q->read_buf->state == STATE_DONE) {
d00cd298 935 rc = CALL (q,copy_stream, q, data + retval, count,
7a7d9a89
MCC		 936 retval, vbihack, nonblocking);
937 if (rc < 0) {
938 retval = rc;
939 break;
940 }
941 retval += rc;
942 count -= rc;
943 q->read_off += rc;
944 } else {
945 /* some error */
946 q->read_off = q->read_buf->size;
947 if (0 == retval)
948 retval = -EIO;
949 }
950
951 /* requeue buffer when done with copying */
952 if (q->read_off == q->read_buf->size) {
953 list_add_tail(&q->read_buf->stream,
954 &q->stream);
955 if (q->irqlock)
956 spin_lock_irqsave(q->irqlock,flags);
957 q->ops->buf_queue(q,q->read_buf);
958 if (q->irqlock)
959 spin_unlock_irqrestore(q->irqlock,flags);
960 q->read_buf = NULL;
961 }
962 if (retval < 0)
963 break;
964 }
965
966 done:
967 mutex_unlock(&q->lock);
968 return retval;
969}
970
971unsigned int videobuf_poll_stream(struct file *file,
972 struct videobuf_queue *q,
973 poll_table *wait)
974{
975 struct videobuf_buffer *buf = NULL;
976 unsigned int rc = 0;
977
978 mutex_lock(&q->lock);
979 if (q->streaming) {
980 if (!list_empty(&q->stream))
981 buf = list_entry(q->stream.next,
982 struct videobuf_buffer, stream);
983 } else {
984 if (!q->reading)
985 videobuf_read_start(q);
986 if (!q->reading) {
987 rc = POLLERR;
988 } else if (NULL == q->read_buf) {
989 q->read_buf = list_entry(q->stream.next,
990 struct videobuf_buffer,
991 stream);
992 list_del(&q->read_buf->stream);
993 q->read_off = 0;
994 }
995 buf = q->read_buf;
996 }
997 if (!buf)
998 rc = POLLERR;
999
1000 if (0 == rc) {
1001 poll_wait(file, &buf->done, wait);
1002 if (buf->state == STATE_DONE ||
1003 buf->state == STATE_ERROR)
1004 rc = POLLIN|POLLRDNORM;
1005 }
1006 mutex_unlock(&q->lock);
1007 return rc;
1008}
1009
7a7d9a89
MCC		 1010int videobuf_mmap_mapper(struct videobuf_queue *q,
1011 struct vm_area_struct *vma)
1012{
1013 int retval;
1014
1015 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
1016
1017 mutex_lock(&q->lock);
1018 retval=CALL(q,mmap_mapper,q,vma);
1019 mutex_unlock(&q->lock);
1020
1021 return retval;
1022}
1023
1024#ifdef CONFIG_VIDEO_V4L1_COMPAT
1025int videobuf_cgmbuf(struct videobuf_queue *q,
1026 struct video_mbuf *mbuf, int count)
1027{
1028 struct v4l2_requestbuffers req;
1029 int rc,i;
1030
1031 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
1032
1033 memset(&req,0,sizeof(req));
1034 req.type = q->type;
1035 req.count = count;
1036 req.memory = V4L2_MEMORY_MMAP;
1037 rc = videobuf_reqbufs(q,&req);
1038 if (rc < 0)
1039 return rc;
1040
1041 mbuf->frames = req.count;
1042 mbuf->size = 0;
1043 for (i = 0; i < mbuf->frames; i++) {
1044 mbuf->offsets[i] = q->bufs[i]->boff;
1045 mbuf->size += q->bufs[i]->bsize;
1046 }
1047
1048 return 0;
1049}
a13625c5 1050EXPORT_SYMBOL_GPL(videobuf_cgmbuf);
7a7d9a89
MCC		 1051#endif
1052
1053/* --------------------------------------------------------------------- */
1054
1055EXPORT_SYMBOL_GPL(videobuf_waiton);
1056EXPORT_SYMBOL_GPL(videobuf_iolock);
1057
1058EXPORT_SYMBOL_GPL(videobuf_alloc);
1059
d4cae5a5 1060EXPORT_SYMBOL_GPL(videobuf_queue_core_init);
7a7d9a89
MCC		 1061EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
1062EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
1063
1064EXPORT_SYMBOL_GPL(videobuf_next_field);
1065EXPORT_SYMBOL_GPL(videobuf_reqbufs);
1066EXPORT_SYMBOL_GPL(videobuf_querybuf);
1067EXPORT_SYMBOL_GPL(videobuf_qbuf);
1068EXPORT_SYMBOL_GPL(videobuf_dqbuf);
7a7d9a89
MCC		 1069EXPORT_SYMBOL_GPL(videobuf_streamon);
1070EXPORT_SYMBOL_GPL(videobuf_streamoff);
1071
19fb1457 1072EXPORT_SYMBOL_GPL(videobuf_read_start);
7a7d9a89 1073EXPORT_SYMBOL_GPL(videobuf_read_stop);
19bc5133 1074EXPORT_SYMBOL_GPL(videobuf_stop);
7a7d9a89
MCC		 1075EXPORT_SYMBOL_GPL(videobuf_read_stream);
1076EXPORT_SYMBOL_GPL(videobuf_read_one);
1077EXPORT_SYMBOL_GPL(videobuf_poll_stream);
1078
1079EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
1080EXPORT_SYMBOL_GPL(videobuf_mmap_free);
1081EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);
1082
1083/*
1084 * Local variables:
1085 * c-basic-offset: 8
1086 * End:
1087 */
Linux kernel - Deliverables
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