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Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-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
144int videobuf_queue_is_busy(struct videobuf_queue *q)
145{
146 int i;
147
148 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
149
150 if (q->streaming) {
151 dprintk(1,"busy: streaming active\n");
152 return 1;
153 }
154 if (q->reading) {
155 dprintk(1,"busy: pending read #1\n");
156 return 1;
157 }
158 if (q->read_buf) {
159 dprintk(1,"busy: pending read #2\n");
160 return 1;
161 }
162 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
163 if (NULL == q->bufs[i])
164 continue;
851c0c96 165 if (q->bufs[i]->map) {
7a7d9a89
MCC		 166 dprintk(1,"busy: buffer #%d mapped\n",i);
167 return 1;
168 }
169 if (q->bufs[i]->state == STATE_QUEUED) {
170 dprintk(1,"busy: buffer #%d queued\n",i);
171 return 1;
172 }
173 if (q->bufs[i]->state == STATE_ACTIVE) {
174 dprintk(1,"busy: buffer #%d avtive\n",i);
175 return 1;
176 }
177 }
178 return 0;
179}
180
181void videobuf_queue_cancel(struct videobuf_queue *q)
182{
183 unsigned long flags=0;
184 int i;
185
186 /* remove queued buffers from list */
187 if (q->irqlock)
188 spin_lock_irqsave(q->irqlock,flags);
189 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
190 if (NULL == q->bufs[i])
191 continue;
192 if (q->bufs[i]->state == STATE_QUEUED) {
193 list_del(&q->bufs[i]->queue);
194 q->bufs[i]->state = STATE_ERROR;
195 }
196 }
197 if (q->irqlock)
198 spin_unlock_irqrestore(q->irqlock,flags);
199
200 /* free all buffers + clear queue */
201 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
202 if (NULL == q->bufs[i])
203 continue;
204 q->ops->buf_release(q,q->bufs[i]);
205 }
206 INIT_LIST_HEAD(&q->stream);
207}
208
209/* --------------------------------------------------------------------- */
210
211enum v4l2_field videobuf_next_field(struct videobuf_queue *q)
212{
213 enum v4l2_field field = q->field;
214
215 BUG_ON(V4L2_FIELD_ANY == field);
216
217 if (V4L2_FIELD_ALTERNATE == field) {
218 if (V4L2_FIELD_TOP == q->last) {
219 field = V4L2_FIELD_BOTTOM;
220 q->last = V4L2_FIELD_BOTTOM;
221 } else {
222 field = V4L2_FIELD_TOP;
223 q->last = V4L2_FIELD_TOP;
224 }
225 }
226 return field;
227}
228
229static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b,
230 struct videobuf_buffer *vb, enum v4l2_buf_type type)
231{
232 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
233 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
234
235 b->index = vb->i;
236 b->type = type;
237
238 b->memory = vb->memory;
239 switch (b->memory) {
240 case V4L2_MEMORY_MMAP:
241 b->m.offset = vb->boff;
242 b->length = vb->bsize;
243 break;
244 case V4L2_MEMORY_USERPTR:
245 b->m.userptr = vb->baddr;
246 b->length = vb->bsize;
247 break;
248 case V4L2_MEMORY_OVERLAY:
249 b->m.offset = vb->boff;
250 break;
251 }
252
253 b->flags = 0;
851c0c96 254 if (vb->map)
7a7d9a89
MCC		 255 b->flags |= V4L2_BUF_FLAG_MAPPED;
256
257 switch (vb->state) {
258 case STATE_PREPARED:
259 case STATE_QUEUED:
260 case STATE_ACTIVE:
261 b->flags |= V4L2_BUF_FLAG_QUEUED;
262 break;
263 case STATE_DONE:
264 case STATE_ERROR:
265 b->flags |= V4L2_BUF_FLAG_DONE;
266 break;
267 case STATE_NEEDS_INIT:
268 case STATE_IDLE:
269 /* nothing */
270 break;
271 }
272
273 if (vb->input != UNSET) {
274 b->flags |= V4L2_BUF_FLAG_INPUT;
275 b->input = vb->input;
276 }
277
278 b->field = vb->field;
279 b->timestamp = vb->ts;
280 b->bytesused = vb->size;
281 b->sequence = vb->field_count >> 1;
282}
283
284int videobuf_reqbufs(struct videobuf_queue *q,
285 struct v4l2_requestbuffers *req)
286{
287 unsigned int size,count;
288 int retval;
289
290 if (req->type != q->type) {
291 dprintk(1,"reqbufs: queue type invalid\n");
292 return -EINVAL;
293 }
294 if (req->count < 1) {
295 dprintk(1,"reqbufs: count invalid (%d)\n",req->count);
296 return -EINVAL;
297 }
298 if (req->memory != V4L2_MEMORY_MMAP &&
299 req->memory != V4L2_MEMORY_USERPTR &&
300 req->memory != V4L2_MEMORY_OVERLAY) {
301 dprintk(1,"reqbufs: memory type invalid\n");
302 return -EINVAL;
303 }
304
00f98d08 305 mutex_lock(&q->lock);
7a7d9a89
MCC		 306 if (q->streaming) {
307 dprintk(1,"reqbufs: streaming already exists\n");
00f98d08
BP		 308 retval = -EBUSY;
309 goto done;
7a7d9a89
MCC		 310 }
311 if (!list_empty(&q->stream)) {
312 dprintk(1,"reqbufs: stream running\n");
00f98d08
BP		 313 retval = -EBUSY;
314 goto done;
7a7d9a89
MCC		 315 }
316
7a7d9a89
MCC		 317 count = req->count;
318 if (count > VIDEO_MAX_FRAME)
319 count = VIDEO_MAX_FRAME;
320 size = 0;
321 q->ops->buf_setup(q,&count,&size);
322 size = PAGE_ALIGN(size);
323 dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n",
324 count, size, (count*size)>>PAGE_SHIFT);
325
326 retval = videobuf_mmap_setup(q,count,size,req->memory);
327 if (retval < 0) {
328 dprintk(1,"reqbufs: mmap setup returned %d\n",retval);
329 goto done;
330 }
331
49ee718e 332 req->count = retval;
7a7d9a89
MCC		 333
334 done:
335 mutex_unlock(&q->lock);
336 return retval;
337}
338
339int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
340{
341 if (unlikely(b->type != q->type)) {
342 dprintk(1,"querybuf: Wrong type.\n");
343 return -EINVAL;
344 }
345 if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) {
346 dprintk(1,"querybuf: index out of range.\n");
347 return -EINVAL;
348 }
349 if (unlikely(NULL == q->bufs[b->index])) {
350 dprintk(1,"querybuf: buffer is null.\n");
351 return -EINVAL;
352 }
353 videobuf_status(q,b,q->bufs[b->index],q->type);
354 return 0;
355}
356
357int videobuf_qbuf(struct videobuf_queue *q,
358 struct v4l2_buffer *b)
359{
360 struct videobuf_buffer *buf;
361 enum v4l2_field field;
362 unsigned long flags=0;
363 int retval;
364
365 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
366
9900132f
ML		 367 if (b->memory == V4L2_MEMORY_MMAP)
368 down_read(&current->mm->mmap_sem);
369
7a7d9a89
MCC		 370 mutex_lock(&q->lock);
371 retval = -EBUSY;
372 if (q->reading) {
373 dprintk(1,"qbuf: Reading running...\n");
374 goto done;
375 }
376 retval = -EINVAL;
377 if (b->type != q->type) {
378 dprintk(1,"qbuf: Wrong type.\n");
379 goto done;
380 }
381 if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) {
382 dprintk(1,"qbuf: index out of range.\n");
383 goto done;
384 }
385 buf = q->bufs[b->index];
386 if (NULL == buf) {
387 dprintk(1,"qbuf: buffer is null.\n");
388 goto done;
389 }
390 MAGIC_CHECK(buf->magic,MAGIC_BUFFER);
391 if (buf->memory != b->memory) {
392 dprintk(1,"qbuf: memory type is wrong.\n");
393 goto done;
394 }
395 if (buf->state != STATE_NEEDS_INIT && buf->state != STATE_IDLE) {
396 dprintk(1,"qbuf: buffer is already queued or active.\n");
397 goto done;
398 }
399
400 if (b->flags & V4L2_BUF_FLAG_INPUT) {
401 if (b->input >= q->inputs) {
402 dprintk(1,"qbuf: wrong input.\n");
403 goto done;
404 }
405 buf->input = b->input;
406 } else {
407 buf->input = UNSET;
408 }
409
410 switch (b->memory) {
411 case V4L2_MEMORY_MMAP:
412 if (0 == buf->baddr) {
413 dprintk(1,"qbuf: mmap requested but buffer addr is zero!\n");
414 goto done;
415 }
416 break;
417 case V4L2_MEMORY_USERPTR:
418 if (b->length < buf->bsize) {
419 dprintk(1,"qbuf: buffer length is not enough\n");
420 goto done;
421 }
422 if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr)
423 q->ops->buf_release(q,buf);
424 buf->baddr = b->m.userptr;
425 break;
426 case V4L2_MEMORY_OVERLAY:
427 buf->boff = b->m.offset;
428 break;
429 default:
430 dprintk(1,"qbuf: wrong memory type\n");
431 goto done;
432 }
433
434 dprintk(1,"qbuf: requesting next field\n");
435 field = videobuf_next_field(q);
436 retval = q->ops->buf_prepare(q,buf,field);
437 if (0 != retval) {
438 dprintk(1,"qbuf: buffer_prepare returned %d\n",retval);
439 goto done;
440 }
441
442 list_add_tail(&buf->stream,&q->stream);
443 if (q->streaming) {
444 if (q->irqlock)
445 spin_lock_irqsave(q->irqlock,flags);
446 q->ops->buf_queue(q,buf);
447 if (q->irqlock)
448 spin_unlock_irqrestore(q->irqlock,flags);
449 }
450 dprintk(1,"qbuf: succeded\n");
451 retval = 0;
452
453 done:
454 mutex_unlock(&q->lock);
9900132f
ML		 455
456 if (b->memory == V4L2_MEMORY_MMAP)
457 up_read(&current->mm->mmap_sem);
458
7a7d9a89
MCC		 459 return retval;
460}
461
462int videobuf_dqbuf(struct videobuf_queue *q,
463 struct v4l2_buffer *b, int nonblocking)
464{
465 struct videobuf_buffer *buf;
466 int retval;
467
468 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
469
470 mutex_lock(&q->lock);
471 retval = -EBUSY;
472 if (q->reading) {
473 dprintk(1,"dqbuf: Reading running...\n");
474 goto done;
475 }
476 retval = -EINVAL;
477 if (b->type != q->type) {
478 dprintk(1,"dqbuf: Wrong type.\n");
479 goto done;
480 }
481 if (list_empty(&q->stream)) {
482 dprintk(1,"dqbuf: stream running\n");
483 goto done;
484 }
485 buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
486 retval = videobuf_waiton(buf, nonblocking, 1);
487 if (retval < 0) {
488 dprintk(1,"dqbuf: waiton returned %d\n",retval);
489 goto done;
490 }
491 switch (buf->state) {
492 case STATE_ERROR:
493 dprintk(1,"dqbuf: state is error\n");
494 retval = -EIO;
495 CALL(q,sync,q, buf);
496 buf->state = STATE_IDLE;
497 break;
498 case STATE_DONE:
499 dprintk(1,"dqbuf: state is done\n");
500 CALL(q,sync,q, buf);
501 buf->state = STATE_IDLE;
502 break;
503 default:
504 dprintk(1,"dqbuf: state invalid\n");
505 retval = -EINVAL;
506 goto done;
507 }
508 list_del(&buf->stream);
509 memset(b,0,sizeof(*b));
510 videobuf_status(q,b,buf,q->type);
511
512 done:
513 mutex_unlock(&q->lock);
514 return retval;
515}
516
517int videobuf_streamon(struct videobuf_queue *q)
518{
519 struct videobuf_buffer *buf;
7a7d9a89
MCC		 520 unsigned long flags=0;
521 int retval;
522
523 mutex_lock(&q->lock);
524 retval = -EBUSY;
525 if (q->reading)
526 goto done;
527 retval = 0;
528 if (q->streaming)
529 goto done;
530 q->streaming = 1;
531 if (q->irqlock)
532 spin_lock_irqsave(q->irqlock,flags);
a991f44b 533 list_for_each_entry(buf, &q->stream, stream)
7a7d9a89
MCC		 534 if (buf->state == STATE_PREPARED)
535 q->ops->buf_queue(q,buf);
7a7d9a89
MCC		 536 if (q->irqlock)
537 spin_unlock_irqrestore(q->irqlock,flags);
538
539 done:
540 mutex_unlock(&q->lock);
541 return retval;
542}
543
544int videobuf_streamoff(struct videobuf_queue *q)
545{
546 int retval = -EINVAL;
547
548 mutex_lock(&q->lock);
549 if (!q->streaming)
550 goto done;
551 videobuf_queue_cancel(q);
552 q->streaming = 0;
553 retval = 0;
554
555 done:
556 mutex_unlock(&q->lock);
557 return retval;
558}
559
560static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q,
561 char __user *data,
562 size_t count, loff_t *ppos)
563{
564 enum v4l2_field field;
565 unsigned long flags=0;
566 int retval;
567
568 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
569
570 /* setup stuff */
571 q->read_buf = videobuf_alloc(q);
572 if (NULL == q->read_buf)
573 return -ENOMEM;
574
575 q->read_buf->memory = V4L2_MEMORY_USERPTR;
576 q->read_buf->baddr = (unsigned long)data;
577 q->read_buf->bsize = count;
578
579 field = videobuf_next_field(q);
580 retval = q->ops->buf_prepare(q,q->read_buf,field);
581 if (0 != retval)
582 goto done;
583
584 /* start capture & wait */
585 if (q->irqlock)
586 spin_lock_irqsave(q->irqlock,flags);
587 q->ops->buf_queue(q,q->read_buf);
588 if (q->irqlock)
589 spin_unlock_irqrestore(q->irqlock,flags);
590 retval = videobuf_waiton(q->read_buf,0,0);
591 if (0 == retval) {
592 CALL(q,sync,q,q->read_buf);
593 if (STATE_ERROR == q->read_buf->state)
594 retval = -EIO;
595 else
596 retval = q->read_buf->size;
597 }
598
599 done:
600 /* cleanup */
601 q->ops->buf_release(q,q->read_buf);
602 kfree(q->read_buf);
603 q->read_buf = NULL;
604 return retval;
605}
606
607ssize_t videobuf_read_one(struct videobuf_queue *q,
608 char __user *data, size_t count, loff_t *ppos,
609 int nonblocking)
610{
611 enum v4l2_field field;
612 unsigned long flags=0;
613 unsigned size, nbufs;
614 int retval;
615
616 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
617
618 mutex_lock(&q->lock);
619
620 nbufs = 1; size = 0;
621 q->ops->buf_setup(q,&nbufs,&size);
622
623 if (NULL == q->read_buf &&
624 count >= size &&
625 !nonblocking) {
626 retval = videobuf_read_zerocopy(q,data,count,ppos);
627 if (retval >= 0 || retval == -EIO)
628 /* ok, all done */
629 goto done;
630 /* fallback to kernel bounce buffer on failures */
631 }
632
633 if (NULL == q->read_buf) {
634 /* need to capture a new frame */
635 retval = -ENOMEM;
636 q->read_buf = videobuf_alloc(q);
637
638 dprintk(1,"video alloc=0x%p\n", q->read_buf);
639 if (NULL == q->read_buf)
640 goto done;
641 q->read_buf->memory = V4L2_MEMORY_USERPTR;
642 q->read_buf->bsize = count; /* preferred size */
643 field = videobuf_next_field(q);
644 retval = q->ops->buf_prepare(q,q->read_buf,field);
645
646 if (0 != retval) {
647 kfree (q->read_buf);
648 q->read_buf = NULL;
649 goto done;
650 }
651 if (q->irqlock)
652 spin_lock_irqsave(q->irqlock,flags);
653
654 q->ops->buf_queue(q,q->read_buf);
655 if (q->irqlock)
656 spin_unlock_irqrestore(q->irqlock,flags);
657 q->read_off = 0;
658 }
659
660 /* wait until capture is done */
661 retval = videobuf_waiton(q->read_buf, nonblocking, 1);
662 if (0 != retval)
663 goto done;
664
665 CALL(q,sync,q,q->read_buf);
666
667 if (STATE_ERROR == q->read_buf->state) {
668 /* catch I/O errors */
669 q->ops->buf_release(q,q->read_buf);
670 kfree(q->read_buf);
671 q->read_buf = NULL;
672 retval = -EIO;
673 goto done;
674 }
675
676 /* Copy to userspace */
13bcd5d0 677 retval=CALL(q,video_copy_to_user,q,data,count,nonblocking);
7a7d9a89
MCC		 678 if (retval<0)
679 goto done;
680
681 q->read_off += retval;
682 if (q->read_off == q->read_buf->size) {
683 /* all data copied, cleanup */
684 q->ops->buf_release(q,q->read_buf);
685 kfree(q->read_buf);
686 q->read_buf = NULL;
687 }
688
689 done:
690 mutex_unlock(&q->lock);
691 return retval;
692}
693
694int videobuf_read_start(struct videobuf_queue *q)
695{
696 enum v4l2_field field;
697 unsigned long flags=0;
49ee718e 698 unsigned int count = 0, size = 0;
7a7d9a89
MCC		 699 int err, i;
700
701 q->ops->buf_setup(q,&count,&size);
702 if (count < 2)
703 count = 2;
704 if (count > VIDEO_MAX_FRAME)
705 count = VIDEO_MAX_FRAME;
706 size = PAGE_ALIGN(size);
707
708 err = videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR);
49ee718e 709 if (err < 0)
7a7d9a89
MCC		 710 return err;
711
49ee718e
BP		 712 count = err;
713
7a7d9a89
MCC		 714 for (i = 0; i < count; i++) {
715 field = videobuf_next_field(q);
716 err = q->ops->buf_prepare(q,q->bufs[i],field);
717 if (err)
718 return err;
719 list_add_tail(&q->bufs[i]->stream, &q->stream);
720 }
721 if (q->irqlock)
722 spin_lock_irqsave(q->irqlock,flags);
723 for (i = 0; i < count; i++)
724 q->ops->buf_queue(q,q->bufs[i]);
725 if (q->irqlock)
726 spin_unlock_irqrestore(q->irqlock,flags);
727 q->reading = 1;
728 return 0;
729}
730
731void videobuf_read_stop(struct videobuf_queue *q)
732{
733 int i;
734
735 videobuf_queue_cancel(q);
736 videobuf_mmap_free(q);
737 INIT_LIST_HEAD(&q->stream);
738 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
739 if (NULL == q->bufs[i])
740 continue;
741 kfree(q->bufs[i]);
742 q->bufs[i] = NULL;
743 }
744 q->read_buf = NULL;
745 q->reading = 0;
746}
747
748ssize_t videobuf_read_stream(struct videobuf_queue *q,
749 char __user *data, size_t count, loff_t *ppos,
750 int vbihack, int nonblocking)
751{
752 int rc, retval;
753 unsigned long flags=0;
754
755 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
756
757 dprintk(2,"%s\n",__FUNCTION__);
758 mutex_lock(&q->lock);
759 retval = -EBUSY;
760 if (q->streaming)
761 goto done;
762 if (!q->reading) {
763 retval = videobuf_read_start(q);
764 if (retval < 0)
765 goto done;
766 }
767
768 retval = 0;
769 while (count > 0) {
770 /* get / wait for data */
771 if (NULL == q->read_buf) {
772 q->read_buf = list_entry(q->stream.next,
773 struct videobuf_buffer,
774 stream);
775 list_del(&q->read_buf->stream);
776 q->read_off = 0;
777 }
778 rc = videobuf_waiton(q->read_buf, nonblocking, 1);
779 if (rc < 0) {
780 if (0 == retval)
781 retval = rc;
782 break;
783 }
784
785 if (q->read_buf->state == STATE_DONE) {
d00cd298 786 rc = CALL (q,copy_stream, q, data + retval, count,
7a7d9a89
MCC		 787 retval, vbihack, nonblocking);
788 if (rc < 0) {
789 retval = rc;
790 break;
791 }
792 retval += rc;
793 count -= rc;
794 q->read_off += rc;
795 } else {
796 /* some error */
797 q->read_off = q->read_buf->size;
798 if (0 == retval)
799 retval = -EIO;
800 }
801
802 /* requeue buffer when done with copying */
803 if (q->read_off == q->read_buf->size) {
804 list_add_tail(&q->read_buf->stream,
805 &q->stream);
806 if (q->irqlock)
807 spin_lock_irqsave(q->irqlock,flags);
808 q->ops->buf_queue(q,q->read_buf);
809 if (q->irqlock)
810 spin_unlock_irqrestore(q->irqlock,flags);
811 q->read_buf = NULL;
812 }
813 if (retval < 0)
814 break;
815 }
816
817 done:
818 mutex_unlock(&q->lock);
819 return retval;
820}
821
822unsigned int videobuf_poll_stream(struct file *file,
823 struct videobuf_queue *q,
824 poll_table *wait)
825{
826 struct videobuf_buffer *buf = NULL;
827 unsigned int rc = 0;
828
829 mutex_lock(&q->lock);
830 if (q->streaming) {
831 if (!list_empty(&q->stream))
832 buf = list_entry(q->stream.next,
833 struct videobuf_buffer, stream);
834 } else {
835 if (!q->reading)
836 videobuf_read_start(q);
837 if (!q->reading) {
838 rc = POLLERR;
839 } else if (NULL == q->read_buf) {
840 q->read_buf = list_entry(q->stream.next,
841 struct videobuf_buffer,
842 stream);
843 list_del(&q->read_buf->stream);
844 q->read_off = 0;
845 }
846 buf = q->read_buf;
847 }
848 if (!buf)
849 rc = POLLERR;
850
851 if (0 == rc) {
852 poll_wait(file, &buf->done, wait);
853 if (buf->state == STATE_DONE ||
854 buf->state == STATE_ERROR)
855 rc = POLLIN|POLLRDNORM;
856 }
857 mutex_unlock(&q->lock);
858 return rc;
859}
860
861int videobuf_mmap_setup(struct videobuf_queue *q,
862 unsigned int bcount, unsigned int bsize,
863 enum v4l2_memory memory)
864{
865 unsigned int i;
866 int err;
867
868 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
869
870 err = videobuf_mmap_free(q);
871 if (0 != err)
872 return err;
873
874 /* Allocate and initialize buffers */
875 for (i = 0; i < bcount; i++) {
876 q->bufs[i] = videobuf_alloc(q);
877
49ee718e
BP		 878 if (q->bufs[i] == NULL)
879 break;
880
7a7d9a89
MCC		 881 q->bufs[i]->i = i;
882 q->bufs[i]->input = UNSET;
883 q->bufs[i]->memory = memory;
884 q->bufs[i]->bsize = bsize;
885 switch (memory) {
886 case V4L2_MEMORY_MMAP:
887 q->bufs[i]->boff = bsize * i;
888 break;
889 case V4L2_MEMORY_USERPTR:
890 case V4L2_MEMORY_OVERLAY:
891 /* nothing */
892 break;
893 }
894 }
895
49ee718e
BP		 896 if (!i)
897 return -ENOMEM;
898
7a7d9a89 899 dprintk(1,"mmap setup: %d buffers, %d bytes each\n",
49ee718e 900 i, bsize);
7a7d9a89 901
49ee718e 902 return i;
7a7d9a89
MCC		 903}
904
905int videobuf_mmap_free(struct videobuf_queue *q)
906{
907 int i;
908 int rc;
909
cd4765ef
MCC		 910 if (!q)
911 return 0;
912
7a7d9a89
MCC		 913 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
914
915 rc = CALL(q,mmap_free,q);
916 if (rc<0)
917 return rc;
918
919 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
920 if (NULL == q->bufs[i])
921 continue;
922 q->ops->buf_release(q,q->bufs[i]);
923 kfree(q->bufs[i]);
924 q->bufs[i] = NULL;
925 }
926
927 return rc;
928}
929
930int videobuf_mmap_mapper(struct videobuf_queue *q,
931 struct vm_area_struct *vma)
932{
933 int retval;
934
935 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
936
937 mutex_lock(&q->lock);
938 retval=CALL(q,mmap_mapper,q,vma);
939 mutex_unlock(&q->lock);
940
941 return retval;
942}
943
944#ifdef CONFIG_VIDEO_V4L1_COMPAT
945int videobuf_cgmbuf(struct videobuf_queue *q,
946 struct video_mbuf *mbuf, int count)
947{
948 struct v4l2_requestbuffers req;
949 int rc,i;
950
951 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
952
953 memset(&req,0,sizeof(req));
954 req.type = q->type;
955 req.count = count;
956 req.memory = V4L2_MEMORY_MMAP;
957 rc = videobuf_reqbufs(q,&req);
958 if (rc < 0)
959 return rc;
960
961 mbuf->frames = req.count;
962 mbuf->size = 0;
963 for (i = 0; i < mbuf->frames; i++) {
964 mbuf->offsets[i] = q->bufs[i]->boff;
965 mbuf->size += q->bufs[i]->bsize;
966 }
967
968 return 0;
969}
970#endif
971
972/* --------------------------------------------------------------------- */
973
974EXPORT_SYMBOL_GPL(videobuf_waiton);
975EXPORT_SYMBOL_GPL(videobuf_iolock);
976
977EXPORT_SYMBOL_GPL(videobuf_alloc);
978
d4cae5a5 979EXPORT_SYMBOL_GPL(videobuf_queue_core_init);
7a7d9a89
MCC		 980EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
981EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
982
983EXPORT_SYMBOL_GPL(videobuf_next_field);
984EXPORT_SYMBOL_GPL(videobuf_reqbufs);
985EXPORT_SYMBOL_GPL(videobuf_querybuf);
986EXPORT_SYMBOL_GPL(videobuf_qbuf);
987EXPORT_SYMBOL_GPL(videobuf_dqbuf);
988EXPORT_SYMBOL_GPL(videobuf_cgmbuf);
989EXPORT_SYMBOL_GPL(videobuf_streamon);
990EXPORT_SYMBOL_GPL(videobuf_streamoff);
991
992EXPORT_SYMBOL_GPL(videobuf_read_start);
993EXPORT_SYMBOL_GPL(videobuf_read_stop);
994EXPORT_SYMBOL_GPL(videobuf_read_stream);
995EXPORT_SYMBOL_GPL(videobuf_read_one);
996EXPORT_SYMBOL_GPL(videobuf_poll_stream);
997
998EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
999EXPORT_SYMBOL_GPL(videobuf_mmap_free);
1000EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);
1001
1002/*
1003 * Local variables:
1004 * c-basic-offset: 8
1005 * End:
1006 */
Linux kernel - Deliverables
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