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V4L/DVB (6301): pvrusb: Update DEBUGIFC sysfs to kernel 2.6.13+
[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
332 req->count = count;
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;
520 struct list_head *list;
521 unsigned long flags=0;
522 int retval;
523
524 mutex_lock(&q->lock);
525 retval = -EBUSY;
526 if (q->reading)
527 goto done;
528 retval = 0;
529 if (q->streaming)
530 goto done;
531 q->streaming = 1;
532 if (q->irqlock)
533 spin_lock_irqsave(q->irqlock,flags);
534 list_for_each(list,&q->stream) {
535 buf = list_entry(list, struct videobuf_buffer, stream);
536 if (buf->state == STATE_PREPARED)
537 q->ops->buf_queue(q,buf);
538 }
539 if (q->irqlock)
540 spin_unlock_irqrestore(q->irqlock,flags);
541
542 done:
543 mutex_unlock(&q->lock);
544 return retval;
545}
546
547int videobuf_streamoff(struct videobuf_queue *q)
548{
549 int retval = -EINVAL;
550
551 mutex_lock(&q->lock);
552 if (!q->streaming)
553 goto done;
554 videobuf_queue_cancel(q);
555 q->streaming = 0;
556 retval = 0;
557
558 done:
559 mutex_unlock(&q->lock);
560 return retval;
561}
562
563static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q,
564 char __user *data,
565 size_t count, loff_t *ppos)
566{
567 enum v4l2_field field;
568 unsigned long flags=0;
569 int retval;
570
571 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
572
573 /* setup stuff */
574 q->read_buf = videobuf_alloc(q);
575 if (NULL == q->read_buf)
576 return -ENOMEM;
577
578 q->read_buf->memory = V4L2_MEMORY_USERPTR;
579 q->read_buf->baddr = (unsigned long)data;
580 q->read_buf->bsize = count;
581
582 field = videobuf_next_field(q);
583 retval = q->ops->buf_prepare(q,q->read_buf,field);
584 if (0 != retval)
585 goto done;
586
587 /* start capture & wait */
588 if (q->irqlock)
589 spin_lock_irqsave(q->irqlock,flags);
590 q->ops->buf_queue(q,q->read_buf);
591 if (q->irqlock)
592 spin_unlock_irqrestore(q->irqlock,flags);
593 retval = videobuf_waiton(q->read_buf,0,0);
594 if (0 == retval) {
595 CALL(q,sync,q,q->read_buf);
596 if (STATE_ERROR == q->read_buf->state)
597 retval = -EIO;
598 else
599 retval = q->read_buf->size;
600 }
601
602 done:
603 /* cleanup */
604 q->ops->buf_release(q,q->read_buf);
605 kfree(q->read_buf);
606 q->read_buf = NULL;
607 return retval;
608}
609
610ssize_t videobuf_read_one(struct videobuf_queue *q,
611 char __user *data, size_t count, loff_t *ppos,
612 int nonblocking)
613{
614 enum v4l2_field field;
615 unsigned long flags=0;
616 unsigned size, nbufs;
617 int retval;
618
619 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
620
621 mutex_lock(&q->lock);
622
623 nbufs = 1; size = 0;
624 q->ops->buf_setup(q,&nbufs,&size);
625
626 if (NULL == q->read_buf &&
627 count >= size &&
628 !nonblocking) {
629 retval = videobuf_read_zerocopy(q,data,count,ppos);
630 if (retval >= 0 || retval == -EIO)
631 /* ok, all done */
632 goto done;
633 /* fallback to kernel bounce buffer on failures */
634 }
635
636 if (NULL == q->read_buf) {
637 /* need to capture a new frame */
638 retval = -ENOMEM;
639 q->read_buf = videobuf_alloc(q);
640
641 dprintk(1,"video alloc=0x%p\n", q->read_buf);
642 if (NULL == q->read_buf)
643 goto done;
644 q->read_buf->memory = V4L2_MEMORY_USERPTR;
645 q->read_buf->bsize = count; /* preferred size */
646 field = videobuf_next_field(q);
647 retval = q->ops->buf_prepare(q,q->read_buf,field);
648
649 if (0 != retval) {
650 kfree (q->read_buf);
651 q->read_buf = NULL;
652 goto done;
653 }
654 if (q->irqlock)
655 spin_lock_irqsave(q->irqlock,flags);
656
657 q->ops->buf_queue(q,q->read_buf);
658 if (q->irqlock)
659 spin_unlock_irqrestore(q->irqlock,flags);
660 q->read_off = 0;
661 }
662
663 /* wait until capture is done */
664 retval = videobuf_waiton(q->read_buf, nonblocking, 1);
665 if (0 != retval)
666 goto done;
667
668 CALL(q,sync,q,q->read_buf);
669
670 if (STATE_ERROR == q->read_buf->state) {
671 /* catch I/O errors */
672 q->ops->buf_release(q,q->read_buf);
673 kfree(q->read_buf);
674 q->read_buf = NULL;
675 retval = -EIO;
676 goto done;
677 }
678
679 /* Copy to userspace */
680 retval=CALL(q,copy_to_user,q,data,count,nonblocking);
681 if (retval<0)
682 goto done;
683
684 q->read_off += retval;
685 if (q->read_off == q->read_buf->size) {
686 /* all data copied, cleanup */
687 q->ops->buf_release(q,q->read_buf);
688 kfree(q->read_buf);
689 q->read_buf = NULL;
690 }
691
692 done:
693 mutex_unlock(&q->lock);
694 return retval;
695}
696
697int videobuf_read_start(struct videobuf_queue *q)
698{
699 enum v4l2_field field;
700 unsigned long flags=0;
701 int count = 0, size = 0;
702 int err, i;
703
704 q->ops->buf_setup(q,&count,&size);
705 if (count < 2)
706 count = 2;
707 if (count > VIDEO_MAX_FRAME)
708 count = VIDEO_MAX_FRAME;
709 size = PAGE_ALIGN(size);
710
711 err = videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR);
712 if (err)
713 return err;
714
715 for (i = 0; i < count; i++) {
716 field = videobuf_next_field(q);
717 err = q->ops->buf_prepare(q,q->bufs[i],field);
718 if (err)
719 return err;
720 list_add_tail(&q->bufs[i]->stream, &q->stream);
721 }
722 if (q->irqlock)
723 spin_lock_irqsave(q->irqlock,flags);
724 for (i = 0; i < count; i++)
725 q->ops->buf_queue(q,q->bufs[i]);
726 if (q->irqlock)
727 spin_unlock_irqrestore(q->irqlock,flags);
728 q->reading = 1;
729 return 0;
730}
731
732void videobuf_read_stop(struct videobuf_queue *q)
733{
734 int i;
735
736 videobuf_queue_cancel(q);
737 videobuf_mmap_free(q);
738 INIT_LIST_HEAD(&q->stream);
739 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
740 if (NULL == q->bufs[i])
741 continue;
742 kfree(q->bufs[i]);
743 q->bufs[i] = NULL;
744 }
745 q->read_buf = NULL;
746 q->reading = 0;
747}
748
749ssize_t videobuf_read_stream(struct videobuf_queue *q,
750 char __user *data, size_t count, loff_t *ppos,
751 int vbihack, int nonblocking)
752{
753 int rc, retval;
754 unsigned long flags=0;
755
756 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
757
758 dprintk(2,"%s\n",__FUNCTION__);
759 mutex_lock(&q->lock);
760 retval = -EBUSY;
761 if (q->streaming)
762 goto done;
763 if (!q->reading) {
764 retval = videobuf_read_start(q);
765 if (retval < 0)
766 goto done;
767 }
768
769 retval = 0;
770 while (count > 0) {
771 /* get / wait for data */
772 if (NULL == q->read_buf) {
773 q->read_buf = list_entry(q->stream.next,
774 struct videobuf_buffer,
775 stream);
776 list_del(&q->read_buf->stream);
777 q->read_off = 0;
778 }
779 rc = videobuf_waiton(q->read_buf, nonblocking, 1);
780 if (rc < 0) {
781 if (0 == retval)
782 retval = rc;
783 break;
784 }
785
786 if (q->read_buf->state == STATE_DONE) {
d00cd298 787 rc = CALL (q,copy_stream, q, data + retval, count,
7a7d9a89
MCC		 788 retval, vbihack, nonblocking);
789 if (rc < 0) {
790 retval = rc;
791 break;
792 }
793 retval += rc;
794 count -= rc;
795 q->read_off += rc;
796 } else {
797 /* some error */
798 q->read_off = q->read_buf->size;
799 if (0 == retval)
800 retval = -EIO;
801 }
802
803 /* requeue buffer when done with copying */
804 if (q->read_off == q->read_buf->size) {
805 list_add_tail(&q->read_buf->stream,
806 &q->stream);
807 if (q->irqlock)
808 spin_lock_irqsave(q->irqlock,flags);
809 q->ops->buf_queue(q,q->read_buf);
810 if (q->irqlock)
811 spin_unlock_irqrestore(q->irqlock,flags);
812 q->read_buf = NULL;
813 }
814 if (retval < 0)
815 break;
816 }
817
818 done:
819 mutex_unlock(&q->lock);
820 return retval;
821}
822
823unsigned int videobuf_poll_stream(struct file *file,
824 struct videobuf_queue *q,
825 poll_table *wait)
826{
827 struct videobuf_buffer *buf = NULL;
828 unsigned int rc = 0;
829
830 mutex_lock(&q->lock);
831 if (q->streaming) {
832 if (!list_empty(&q->stream))
833 buf = list_entry(q->stream.next,
834 struct videobuf_buffer, stream);
835 } else {
836 if (!q->reading)
837 videobuf_read_start(q);
838 if (!q->reading) {
839 rc = POLLERR;
840 } else if (NULL == q->read_buf) {
841 q->read_buf = list_entry(q->stream.next,
842 struct videobuf_buffer,
843 stream);
844 list_del(&q->read_buf->stream);
845 q->read_off = 0;
846 }
847 buf = q->read_buf;
848 }
849 if (!buf)
850 rc = POLLERR;
851
852 if (0 == rc) {
853 poll_wait(file, &buf->done, wait);
854 if (buf->state == STATE_DONE ||
855 buf->state == STATE_ERROR)
856 rc = POLLIN|POLLRDNORM;
857 }
858 mutex_unlock(&q->lock);
859 return rc;
860}
861
862int videobuf_mmap_setup(struct videobuf_queue *q,
863 unsigned int bcount, unsigned int bsize,
864 enum v4l2_memory memory)
865{
866 unsigned int i;
867 int err;
868
869 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
870
871 err = videobuf_mmap_free(q);
872 if (0 != err)
873 return err;
874
875 /* Allocate and initialize buffers */
876 for (i = 0; i < bcount; i++) {
877 q->bufs[i] = videobuf_alloc(q);
878
879 q->bufs[i]->i = i;
880 q->bufs[i]->input = UNSET;
881 q->bufs[i]->memory = memory;
882 q->bufs[i]->bsize = bsize;
883 switch (memory) {
884 case V4L2_MEMORY_MMAP:
885 q->bufs[i]->boff = bsize * i;
886 break;
887 case V4L2_MEMORY_USERPTR:
888 case V4L2_MEMORY_OVERLAY:
889 /* nothing */
890 break;
891 }
892 }
893
894 dprintk(1,"mmap setup: %d buffers, %d bytes each\n",
895 bcount,bsize);
896
897 return 0;
898}
899
900int videobuf_mmap_free(struct videobuf_queue *q)
901{
902 int i;
903 int rc;
904
cd4765ef
MCC		 905 if (!q)
906 return 0;
907
7a7d9a89
MCC		 908 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
909
910 rc = CALL(q,mmap_free,q);
911 if (rc<0)
912 return rc;
913
914 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
915 if (NULL == q->bufs[i])
916 continue;
917 q->ops->buf_release(q,q->bufs[i]);
918 kfree(q->bufs[i]);
919 q->bufs[i] = NULL;
920 }
921
922 return rc;
923}
924
925int videobuf_mmap_mapper(struct videobuf_queue *q,
926 struct vm_area_struct *vma)
927{
928 int retval;
929
930 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
931
932 mutex_lock(&q->lock);
933 retval=CALL(q,mmap_mapper,q,vma);
934 mutex_unlock(&q->lock);
935
936 return retval;
937}
938
939#ifdef CONFIG_VIDEO_V4L1_COMPAT
940int videobuf_cgmbuf(struct videobuf_queue *q,
941 struct video_mbuf *mbuf, int count)
942{
943 struct v4l2_requestbuffers req;
944 int rc,i;
945
946 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
947
948 memset(&req,0,sizeof(req));
949 req.type = q->type;
950 req.count = count;
951 req.memory = V4L2_MEMORY_MMAP;
952 rc = videobuf_reqbufs(q,&req);
953 if (rc < 0)
954 return rc;
955
956 mbuf->frames = req.count;
957 mbuf->size = 0;
958 for (i = 0; i < mbuf->frames; i++) {
959 mbuf->offsets[i] = q->bufs[i]->boff;
960 mbuf->size += q->bufs[i]->bsize;
961 }
962
963 return 0;
964}
965#endif
966
967/* --------------------------------------------------------------------- */
968
969EXPORT_SYMBOL_GPL(videobuf_waiton);
970EXPORT_SYMBOL_GPL(videobuf_iolock);
971
972EXPORT_SYMBOL_GPL(videobuf_alloc);
973
d4cae5a5 974EXPORT_SYMBOL_GPL(videobuf_queue_core_init);
7a7d9a89
MCC		 975EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
976EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
977
978EXPORT_SYMBOL_GPL(videobuf_next_field);
979EXPORT_SYMBOL_GPL(videobuf_reqbufs);
980EXPORT_SYMBOL_GPL(videobuf_querybuf);
981EXPORT_SYMBOL_GPL(videobuf_qbuf);
982EXPORT_SYMBOL_GPL(videobuf_dqbuf);
983EXPORT_SYMBOL_GPL(videobuf_cgmbuf);
984EXPORT_SYMBOL_GPL(videobuf_streamon);
985EXPORT_SYMBOL_GPL(videobuf_streamoff);
986
987EXPORT_SYMBOL_GPL(videobuf_read_start);
988EXPORT_SYMBOL_GPL(videobuf_read_stop);
989EXPORT_SYMBOL_GPL(videobuf_read_stream);
990EXPORT_SYMBOL_GPL(videobuf_read_one);
991EXPORT_SYMBOL_GPL(videobuf_poll_stream);
992
993EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
994EXPORT_SYMBOL_GPL(videobuf_mmap_free);
995EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);
996
997/*
998 * Local variables:
999 * c-basic-offset: 8
1000 * End:
1001 */
Linux kernel - Deliverables
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