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V4L/DVB (6291): Fix: avoid oops on some SMP machines
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / media / video / videobuf-core.c
blobaa402abc4b0ced8f9cc3a5f6ddef1f4ac4edb11d
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
28 static int debug = 0;
29 module_param(debug, int, 0644);
30
31 MODULE_DESCRIPTION("helper module to manage video4linux buffers");
32 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
33 MODULE_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
43 void* 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
64 int 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
91 int 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
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
105 return CALL(q,iolock,q,vb,fbuf);
106 }
107
108 /* --------------------------------------------------------------------- */
109
110
111 void videobuf_queue_init(struct videobuf_queue* q,
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,
118 void *priv)
119 {
120 memset(q,0,sizeof(*q));
121 q->irqlock = irqlock;
122 q->dev = dev;
123 q->type = type;
124 q->field = field;
125 q->msize = msize;
126 q->ops = ops;
127 q->priv_data = priv;
128
129 /* All buffer operations are mandatory */
130 BUG_ON (!q->ops->buf_setup);
131 BUG_ON (!q->ops->buf_prepare);
132 BUG_ON (!q->ops->buf_queue);
133 BUG_ON (!q->ops->buf_release);
134
135 mutex_init(&q->lock);
136 INIT_LIST_HEAD(&q->stream);
137 }
138
139 int videobuf_queue_is_busy(struct videobuf_queue *q)
140 {
141 int i;
142
143 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
144
145 if (q->streaming) {
146 dprintk(1,"busy: streaming active\n");
147 return 1;
148 }
149 if (q->reading) {
150 dprintk(1,"busy: pending read #1\n");
151 return 1;
152 }
153 if (q->read_buf) {
154 dprintk(1,"busy: pending read #2\n");
155 return 1;
156 }
157 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
158 if (NULL == q->bufs[i])
159 continue;
160 if (q->bufs[i]->map) {
161 dprintk(1,"busy: buffer #%d mapped\n",i);
162 return 1;
163 }
164 if (q->bufs[i]->state == STATE_QUEUED) {
165 dprintk(1,"busy: buffer #%d queued\n",i);
166 return 1;
167 }
168 if (q->bufs[i]->state == STATE_ACTIVE) {
169 dprintk(1,"busy: buffer #%d avtive\n",i);
170 return 1;
171 }
172 }
173 return 0;
174 }
175
176 void videobuf_queue_cancel(struct videobuf_queue *q)
177 {
178 unsigned long flags=0;
179 int i;
180
181 /* remove queued buffers from list */
182 if (q->irqlock)
183 spin_lock_irqsave(q->irqlock,flags);
184 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
185 if (NULL == q->bufs[i])
186 continue;
187 if (q->bufs[i]->state == STATE_QUEUED) {
188 list_del(&q->bufs[i]->queue);
189 q->bufs[i]->state = STATE_ERROR;
190 }
191 }
192 if (q->irqlock)
193 spin_unlock_irqrestore(q->irqlock,flags);
194
195 /* free all buffers + clear queue */
196 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
197 if (NULL == q->bufs[i])
198 continue;
199 q->ops->buf_release(q,q->bufs[i]);
200 }
201 INIT_LIST_HEAD(&q->stream);
202 }
203
204 /* --------------------------------------------------------------------- */
205
206 enum v4l2_field videobuf_next_field(struct videobuf_queue *q)
207 {
208 enum v4l2_field field = q->field;
209
210 BUG_ON(V4L2_FIELD_ANY == field);
211
212 if (V4L2_FIELD_ALTERNATE == field) {
213 if (V4L2_FIELD_TOP == q->last) {
214 field = V4L2_FIELD_BOTTOM;
215 q->last = V4L2_FIELD_BOTTOM;
216 } else {
217 field = V4L2_FIELD_TOP;
218 q->last = V4L2_FIELD_TOP;
219 }
220 }
221 return field;
222 }
223
224 static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b,
225 struct videobuf_buffer *vb, enum v4l2_buf_type type)
226 {
227 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
228 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
229
230 b->index = vb->i;
231 b->type = type;
232
233 b->memory = vb->memory;
234 switch (b->memory) {
235 case V4L2_MEMORY_MMAP:
236 b->m.offset = vb->boff;
237 b->length = vb->bsize;
238 break;
239 case V4L2_MEMORY_USERPTR:
240 b->m.userptr = vb->baddr;
241 b->length = vb->bsize;
242 break;
243 case V4L2_MEMORY_OVERLAY:
244 b->m.offset = vb->boff;
245 break;
246 }
247
248 b->flags = 0;
249 if (vb->map)
250 b->flags |= V4L2_BUF_FLAG_MAPPED;
251
252 switch (vb->state) {
253 case STATE_PREPARED:
254 case STATE_QUEUED:
255 case STATE_ACTIVE:
256 b->flags |= V4L2_BUF_FLAG_QUEUED;
257 break;
258 case STATE_DONE:
259 case STATE_ERROR:
260 b->flags |= V4L2_BUF_FLAG_DONE;
261 break;
262 case STATE_NEEDS_INIT:
263 case STATE_IDLE:
264 /* nothing */
265 break;
266 }
267
268 if (vb->input != UNSET) {
269 b->flags |= V4L2_BUF_FLAG_INPUT;
270 b->input = vb->input;
271 }
272
273 b->field = vb->field;
274 b->timestamp = vb->ts;
275 b->bytesused = vb->size;
276 b->sequence = vb->field_count >> 1;
277 }
278
279 int videobuf_reqbufs(struct videobuf_queue *q,
280 struct v4l2_requestbuffers *req)
281 {
282 unsigned int size,count;
283 int retval;
284
285 if (req->type != q->type) {
286 dprintk(1,"reqbufs: queue type invalid\n");
287 return -EINVAL;
288 }
289 if (req->count < 1) {
290 dprintk(1,"reqbufs: count invalid (%d)\n",req->count);
291 return -EINVAL;
292 }
293 if (req->memory != V4L2_MEMORY_MMAP &&
294 req->memory != V4L2_MEMORY_USERPTR &&
295 req->memory != V4L2_MEMORY_OVERLAY) {
296 dprintk(1,"reqbufs: memory type invalid\n");
297 return -EINVAL;
298 }
299
300 mutex_lock(&q->lock);
301 if (q->streaming) {
302 dprintk(1,"reqbufs: streaming already exists\n");
303 retval = -EBUSY;
304 goto done;
305 }
306 if (!list_empty(&q->stream)) {
307 dprintk(1,"reqbufs: stream running\n");
308 retval = -EBUSY;
309 goto done;
310 }
311
312 count = req->count;
313 if (count > VIDEO_MAX_FRAME)
314 count = VIDEO_MAX_FRAME;
315 size = 0;
316 q->ops->buf_setup(q,&count,&size);
317 size = PAGE_ALIGN(size);
318 dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n",
319 count, size, (count*size)>>PAGE_SHIFT);
320
321 retval = videobuf_mmap_setup(q,count,size,req->memory);
322 if (retval < 0) {
323 dprintk(1,"reqbufs: mmap setup returned %d\n",retval);
324 goto done;
325 }
326
327 req->count = count;
328
329 done:
330 mutex_unlock(&q->lock);
331 return retval;
332 }
333
334 int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
335 {
336 if (unlikely(b->type != q->type)) {
337 dprintk(1,"querybuf: Wrong type.\n");
338 return -EINVAL;
339 }
340 if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) {
341 dprintk(1,"querybuf: index out of range.\n");
342 return -EINVAL;
343 }
344 if (unlikely(NULL == q->bufs[b->index])) {
345 dprintk(1,"querybuf: buffer is null.\n");
346 return -EINVAL;
347 }
348 videobuf_status(q,b,q->bufs[b->index],q->type);
349 return 0;
350 }
351
352 int videobuf_qbuf(struct videobuf_queue *q,
353 struct v4l2_buffer *b)
354 {
355 struct videobuf_buffer *buf;
356 enum v4l2_field field;
357 unsigned long flags=0;
358 int retval;
359
360 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
361
362 if (b->memory == V4L2_MEMORY_MMAP)
363 down_read(&current->mm->mmap_sem);
364
365 mutex_lock(&q->lock);
366 retval = -EBUSY;
367 if (q->reading) {
368 dprintk(1,"qbuf: Reading running...\n");
369 goto done;
370 }
371 retval = -EINVAL;
372 if (b->type != q->type) {
373 dprintk(1,"qbuf: Wrong type.\n");
374 goto done;
375 }
376 if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) {
377 dprintk(1,"qbuf: index out of range.\n");
378 goto done;
379 }
380 buf = q->bufs[b->index];
381 if (NULL == buf) {
382 dprintk(1,"qbuf: buffer is null.\n");
383 goto done;
384 }
385 MAGIC_CHECK(buf->magic,MAGIC_BUFFER);
386 if (buf->memory != b->memory) {
387 dprintk(1,"qbuf: memory type is wrong.\n");
388 goto done;
389 }
390 if (buf->state != STATE_NEEDS_INIT && buf->state != STATE_IDLE) {
391 dprintk(1,"qbuf: buffer is already queued or active.\n");
392 goto done;
393 }
394
395 if (b->flags & V4L2_BUF_FLAG_INPUT) {
396 if (b->input >= q->inputs) {
397 dprintk(1,"qbuf: wrong input.\n");
398 goto done;
399 }
400 buf->input = b->input;
401 } else {
402 buf->input = UNSET;
403 }
404
405 switch (b->memory) {
406 case V4L2_MEMORY_MMAP:
407 if (0 == buf->baddr) {
408 dprintk(1,"qbuf: mmap requested but buffer addr is zero!\n");
409 goto done;
410 }
411 break;
412 case V4L2_MEMORY_USERPTR:
413 if (b->length < buf->bsize) {
414 dprintk(1,"qbuf: buffer length is not enough\n");
415 goto done;
416 }
417 if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr)
418 q->ops->buf_release(q,buf);
419 buf->baddr = b->m.userptr;
420 break;
421 case V4L2_MEMORY_OVERLAY:
422 buf->boff = b->m.offset;
423 break;
424 default:
425 dprintk(1,"qbuf: wrong memory type\n");
426 goto done;
427 }
428
429 dprintk(1,"qbuf: requesting next field\n");
430 field = videobuf_next_field(q);
431 retval = q->ops->buf_prepare(q,buf,field);
432 if (0 != retval) {
433 dprintk(1,"qbuf: buffer_prepare returned %d\n",retval);
434 goto done;
435 }
436
437 list_add_tail(&buf->stream,&q->stream);
438 if (q->streaming) {
439 if (q->irqlock)
440 spin_lock_irqsave(q->irqlock,flags);
441 q->ops->buf_queue(q,buf);
442 if (q->irqlock)
443 spin_unlock_irqrestore(q->irqlock,flags);
444 }
445 dprintk(1,"qbuf: succeded\n");
446 retval = 0;
447
448 done:
449 mutex_unlock(&q->lock);
450
451 if (b->memory == V4L2_MEMORY_MMAP)
452 up_read(&current->mm->mmap_sem);
453
454 return retval;
455 }
456
457 int videobuf_dqbuf(struct videobuf_queue *q,
458 struct v4l2_buffer *b, int nonblocking)
459 {
460 struct videobuf_buffer *buf;
461 int retval;
462
463 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
464
465 mutex_lock(&q->lock);
466 retval = -EBUSY;
467 if (q->reading) {
468 dprintk(1,"dqbuf: Reading running...\n");
469 goto done;
470 }
471 retval = -EINVAL;
472 if (b->type != q->type) {
473 dprintk(1,"dqbuf: Wrong type.\n");
474 goto done;
475 }
476 if (list_empty(&q->stream)) {
477 dprintk(1,"dqbuf: stream running\n");
478 goto done;
479 }
480 buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
481 retval = videobuf_waiton(buf, nonblocking, 1);
482 if (retval < 0) {
483 dprintk(1,"dqbuf: waiton returned %d\n",retval);
484 goto done;
485 }
486 switch (buf->state) {
487 case STATE_ERROR:
488 dprintk(1,"dqbuf: state is error\n");
489 retval = -EIO;
490 CALL(q,sync,q, buf);
491 buf->state = STATE_IDLE;
492 break;
493 case STATE_DONE:
494 dprintk(1,"dqbuf: state is done\n");
495 CALL(q,sync,q, buf);
496 buf->state = STATE_IDLE;
497 break;
498 default:
499 dprintk(1,"dqbuf: state invalid\n");
500 retval = -EINVAL;
501 goto done;
502 }
503 list_del(&buf->stream);
504 memset(b,0,sizeof(*b));
505 videobuf_status(q,b,buf,q->type);
506
507 done:
508 mutex_unlock(&q->lock);
509 return retval;
510 }
511
512 int videobuf_streamon(struct videobuf_queue *q)
513 {
514 struct videobuf_buffer *buf;
515 struct list_head *list;
516 unsigned long flags=0;
517 int retval;
518
519 mutex_lock(&q->lock);
520 retval = -EBUSY;
521 if (q->reading)
522 goto done;
523 retval = 0;
524 if (q->streaming)
525 goto done;
526 q->streaming = 1;
527 if (q->irqlock)
528 spin_lock_irqsave(q->irqlock,flags);
529 list_for_each(list,&q->stream) {
530 buf = list_entry(list, struct videobuf_buffer, stream);
531 if (buf->state == STATE_PREPARED)
532 q->ops->buf_queue(q,buf);
533 }
534 if (q->irqlock)
535 spin_unlock_irqrestore(q->irqlock,flags);
536
537 done:
538 mutex_unlock(&q->lock);
539 return retval;
540 }
541
542 int videobuf_streamoff(struct videobuf_queue *q)
543 {
544 int retval = -EINVAL;
545
546 mutex_lock(&q->lock);
547 if (!q->streaming)
548 goto done;
549 videobuf_queue_cancel(q);
550 q->streaming = 0;
551 retval = 0;
552
553 done:
554 mutex_unlock(&q->lock);
555 return retval;
556 }
557
558 static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q,
559 char __user *data,
560 size_t count, loff_t *ppos)
561 {
562 enum v4l2_field field;
563 unsigned long flags=0;
564 int retval;
565
566 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
567
568 /* setup stuff */
569 q->read_buf = videobuf_alloc(q);
570 if (NULL == q->read_buf)
571 return -ENOMEM;
572
573 q->read_buf->memory = V4L2_MEMORY_USERPTR;
574 q->read_buf->baddr = (unsigned long)data;
575 q->read_buf->bsize = count;
576
577 field = videobuf_next_field(q);
578 retval = q->ops->buf_prepare(q,q->read_buf,field);
579 if (0 != retval)
580 goto done;
581
582 /* start capture & wait */
583 if (q->irqlock)
584 spin_lock_irqsave(q->irqlock,flags);
585 q->ops->buf_queue(q,q->read_buf);
586 if (q->irqlock)
587 spin_unlock_irqrestore(q->irqlock,flags);
588 retval = videobuf_waiton(q->read_buf,0,0);
589 if (0 == retval) {
590 CALL(q,sync,q,q->read_buf);
591 if (STATE_ERROR == q->read_buf->state)
592 retval = -EIO;
593 else
594 retval = q->read_buf->size;
595 }
596
597 done:
598 /* cleanup */
599 q->ops->buf_release(q,q->read_buf);
600 kfree(q->read_buf);
601 q->read_buf = NULL;
602 return retval;
603 }
604
605 ssize_t videobuf_read_one(struct videobuf_queue *q,
606 char __user *data, size_t count, loff_t *ppos,
607 int nonblocking)
608 {
609 enum v4l2_field field;
610 unsigned long flags=0;
611 unsigned size, nbufs;
612 int retval;
613
614 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
615
616 mutex_lock(&q->lock);
617
618 nbufs = 1; size = 0;
619 q->ops->buf_setup(q,&nbufs,&size);
620
621 if (NULL == q->read_buf &&
622 count >= size &&
623 !nonblocking) {
624 retval = videobuf_read_zerocopy(q,data,count,ppos);
625 if (retval >= 0 || retval == -EIO)
626 /* ok, all done */
627 goto done;
628 /* fallback to kernel bounce buffer on failures */
629 }
630
631 if (NULL == q->read_buf) {
632 /* need to capture a new frame */
633 retval = -ENOMEM;
634 q->read_buf = videobuf_alloc(q);
635
636 dprintk(1,"video alloc=0x%p\n", q->read_buf);
637 if (NULL == q->read_buf)
638 goto done;
639 q->read_buf->memory = V4L2_MEMORY_USERPTR;
640 q->read_buf->bsize = count; /* preferred size */
641 field = videobuf_next_field(q);
642 retval = q->ops->buf_prepare(q,q->read_buf,field);
643
644 if (0 != retval) {
645 kfree (q->read_buf);
646 q->read_buf = NULL;
647 goto done;
648 }
649 if (q->irqlock)
650 spin_lock_irqsave(q->irqlock,flags);
651
652 q->ops->buf_queue(q,q->read_buf);
653 if (q->irqlock)
654 spin_unlock_irqrestore(q->irqlock,flags);
655 q->read_off = 0;
656 }
657
658 /* wait until capture is done */
659 retval = videobuf_waiton(q->read_buf, nonblocking, 1);
660 if (0 != retval)
661 goto done;
662
663 CALL(q,sync,q,q->read_buf);
664
665 if (STATE_ERROR == q->read_buf->state) {
666 /* catch I/O errors */
667 q->ops->buf_release(q,q->read_buf);
668 kfree(q->read_buf);
669 q->read_buf = NULL;
670 retval = -EIO;
671 goto done;
672 }
673
674 /* Copy to userspace */
675 retval=CALL(q,copy_to_user,q,data,count,nonblocking);
676 if (retval<0)
677 goto done;
678
679 q->read_off += retval;
680 if (q->read_off == q->read_buf->size) {
681 /* all data copied, cleanup */
682 q->ops->buf_release(q,q->read_buf);
683 kfree(q->read_buf);
684 q->read_buf = NULL;
685 }
686
687 done:
688 mutex_unlock(&q->lock);
689 return retval;
690 }
691
692 int videobuf_read_start(struct videobuf_queue *q)
693 {
694 enum v4l2_field field;
695 unsigned long flags=0;
696 int count = 0, size = 0;
697 int err, i;
698
699 q->ops->buf_setup(q,&count,&size);
700 if (count < 2)
701 count = 2;
702 if (count > VIDEO_MAX_FRAME)
703 count = VIDEO_MAX_FRAME;
704 size = PAGE_ALIGN(size);
705
706 err = videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR);
707 if (err)
708 return err;
709
710 for (i = 0; i < count; i++) {
711 field = videobuf_next_field(q);
712 err = q->ops->buf_prepare(q,q->bufs[i],field);
713 if (err)
714 return err;
715 list_add_tail(&q->bufs[i]->stream, &q->stream);
716 }
717 if (q->irqlock)
718 spin_lock_irqsave(q->irqlock,flags);
719 for (i = 0; i < count; i++)
720 q->ops->buf_queue(q,q->bufs[i]);
721 if (q->irqlock)
722 spin_unlock_irqrestore(q->irqlock,flags);
723 q->reading = 1;
724 return 0;
725 }
726
727 void videobuf_read_stop(struct videobuf_queue *q)
728 {
729 int i;
730
731 videobuf_queue_cancel(q);
732 videobuf_mmap_free(q);
733 INIT_LIST_HEAD(&q->stream);
734 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
735 if (NULL == q->bufs[i])
736 continue;
737 kfree(q->bufs[i]);
738 q->bufs[i] = NULL;
739 }
740 q->read_buf = NULL;
741 q->reading = 0;
742 }
743
744 ssize_t videobuf_read_stream(struct videobuf_queue *q,
745 char __user *data, size_t count, loff_t *ppos,
746 int vbihack, int nonblocking)
747 {
748 int rc, retval;
749 unsigned long flags=0;
750
751 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
752
753 dprintk(2,"%s\n",__FUNCTION__);
754 mutex_lock(&q->lock);
755 retval = -EBUSY;
756 if (q->streaming)
757 goto done;
758 if (!q->reading) {
759 retval = videobuf_read_start(q);
760 if (retval < 0)
761 goto done;
762 }
763
764 retval = 0;
765 while (count > 0) {
766 /* get / wait for data */
767 if (NULL == q->read_buf) {
768 q->read_buf = list_entry(q->stream.next,
769 struct videobuf_buffer,
770 stream);
771 list_del(&q->read_buf->stream);
772 q->read_off = 0;
773 }
774 rc = videobuf_waiton(q->read_buf, nonblocking, 1);
775 if (rc < 0) {
776 if (0 == retval)
777 retval = rc;
778 break;
779 }
780
781 if (q->read_buf->state == STATE_DONE) {
782 rc = CALL (q,copy_stream, q, data + retval, count,
783 retval, vbihack, nonblocking);
784 if (rc < 0) {
785 retval = rc;
786 break;
787 }
788 retval += rc;
789 count -= rc;
790 q->read_off += rc;
791 } else {
792 /* some error */
793 q->read_off = q->read_buf->size;
794 if (0 == retval)
795 retval = -EIO;
796 }
797
798 /* requeue buffer when done with copying */
799 if (q->read_off == q->read_buf->size) {
800 list_add_tail(&q->read_buf->stream,
801 &q->stream);
802 if (q->irqlock)
803 spin_lock_irqsave(q->irqlock,flags);
804 q->ops->buf_queue(q,q->read_buf);
805 if (q->irqlock)
806 spin_unlock_irqrestore(q->irqlock,flags);
807 q->read_buf = NULL;
808 }
809 if (retval < 0)
810 break;
811 }
812
813 done:
814 mutex_unlock(&q->lock);
815 return retval;
816 }
817
818 unsigned int videobuf_poll_stream(struct file *file,
819 struct videobuf_queue *q,
820 poll_table *wait)
821 {
822 struct videobuf_buffer *buf = NULL;
823 unsigned int rc = 0;
824
825 mutex_lock(&q->lock);
826 if (q->streaming) {
827 if (!list_empty(&q->stream))
828 buf = list_entry(q->stream.next,
829 struct videobuf_buffer, stream);
830 } else {
831 if (!q->reading)
832 videobuf_read_start(q);
833 if (!q->reading) {
834 rc = POLLERR;
835 } else if (NULL == q->read_buf) {
836 q->read_buf = list_entry(q->stream.next,
837 struct videobuf_buffer,
838 stream);
839 list_del(&q->read_buf->stream);
840 q->read_off = 0;
841 }
842 buf = q->read_buf;
843 }
844 if (!buf)
845 rc = POLLERR;
846
847 if (0 == rc) {
848 poll_wait(file, &buf->done, wait);
849 if (buf->state == STATE_DONE ||
850 buf->state == STATE_ERROR)
851 rc = POLLIN|POLLRDNORM;
852 }
853 mutex_unlock(&q->lock);
854 return rc;
855 }
856
857 int videobuf_mmap_setup(struct videobuf_queue *q,
858 unsigned int bcount, unsigned int bsize,
859 enum v4l2_memory memory)
860 {
861 unsigned int i;
862 int err;
863
864 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
865
866 err = videobuf_mmap_free(q);
867 if (0 != err)
868 return err;
869
870 /* Allocate and initialize buffers */
871 for (i = 0; i < bcount; i++) {
872 q->bufs[i] = videobuf_alloc(q);
873
874 q->bufs[i]->i = i;
875 q->bufs[i]->input = UNSET;
876 q->bufs[i]->memory = memory;
877 q->bufs[i]->bsize = bsize;
878 switch (memory) {
879 case V4L2_MEMORY_MMAP:
880 q->bufs[i]->boff = bsize * i;
881 break;
882 case V4L2_MEMORY_USERPTR:
883 case V4L2_MEMORY_OVERLAY:
884 /* nothing */
885 break;
886 }
887 }
888
889 dprintk(1,"mmap setup: %d buffers, %d bytes each\n",
890 bcount,bsize);
891
892 return 0;
893 }
894
895 int videobuf_mmap_free(struct videobuf_queue *q)
896 {
897 int i;
898 int rc;
899
900 if (!q)
901 return 0;
902
903 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
904
905 rc = CALL(q,mmap_free,q);
906 if (rc<0)
907 return rc;
908
909 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
910 if (NULL == q->bufs[i])
911 continue;
912 q->ops->buf_release(q,q->bufs[i]);
913 kfree(q->bufs[i]);
914 q->bufs[i] = NULL;
915 }
916
917 return rc;
918 }
919
920 int videobuf_mmap_mapper(struct videobuf_queue *q,
921 struct vm_area_struct *vma)
922 {
923 int retval;
924
925 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
926
927 mutex_lock(&q->lock);
928 retval=CALL(q,mmap_mapper,q,vma);
929 mutex_unlock(&q->lock);
930
931 return retval;
932 }
933
934 #ifdef CONFIG_VIDEO_V4L1_COMPAT
935 int videobuf_cgmbuf(struct videobuf_queue *q,
936 struct video_mbuf *mbuf, int count)
937 {
938 struct v4l2_requestbuffers req;
939 int rc,i;
940
941 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
942
943 memset(&req,0,sizeof(req));
944 req.type = q->type;
945 req.count = count;
946 req.memory = V4L2_MEMORY_MMAP;
947 rc = videobuf_reqbufs(q,&req);
948 if (rc < 0)
949 return rc;
950
951 mbuf->frames = req.count;
952 mbuf->size = 0;
953 for (i = 0; i < mbuf->frames; i++) {
954 mbuf->offsets[i] = q->bufs[i]->boff;
955 mbuf->size += q->bufs[i]->bsize;
956 }
957
958 return 0;
959 }
960 #endif
961
962 /* --------------------------------------------------------------------- */
963
964 EXPORT_SYMBOL_GPL(videobuf_waiton);
965 EXPORT_SYMBOL_GPL(videobuf_iolock);
966
967 EXPORT_SYMBOL_GPL(videobuf_alloc);
968
969 EXPORT_SYMBOL_GPL(videobuf_queue_init);
970 EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
971 EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
972
973 EXPORT_SYMBOL_GPL(videobuf_next_field);
974 EXPORT_SYMBOL_GPL(videobuf_reqbufs);
975 EXPORT_SYMBOL_GPL(videobuf_querybuf);
976 EXPORT_SYMBOL_GPL(videobuf_qbuf);
977 EXPORT_SYMBOL_GPL(videobuf_dqbuf);
978 EXPORT_SYMBOL_GPL(videobuf_cgmbuf);
979 EXPORT_SYMBOL_GPL(videobuf_streamon);
980 EXPORT_SYMBOL_GPL(videobuf_streamoff);
981
982 EXPORT_SYMBOL_GPL(videobuf_read_start);
983 EXPORT_SYMBOL_GPL(videobuf_read_stop);
984 EXPORT_SYMBOL_GPL(videobuf_read_stream);
985 EXPORT_SYMBOL_GPL(videobuf_read_one);
986 EXPORT_SYMBOL_GPL(videobuf_poll_stream);
987
988 EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
989 EXPORT_SYMBOL_GPL(videobuf_mmap_free);
990 EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);
991
992 /*
993 * Local variables:
994 * c-basic-offset: 8
995 * End:
996 */
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree