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Revert "[PATCH] paravirt: Add startup infrastructure for paravirtualization"
[pv_ops_mirror.git] / drivers / media / video / video-buf.c
blob459786ff459a97df7bd3c56e3140a29ac0282d96
1 /*
2 *
3 * generic helper functions for video4linux capture buffers, to handle
4 * memory management and PCI DMA.
5 * Right now, bttv, saa7134, saa7146 and cx88 use it.
6 *
7 * The functions expect the hardware being able to scatter gatter
8 * (i.e. the buffers are not linear in physical memory, but fragmented
9 * into PAGE_SIZE chunks). They also assume the driver does not need
10 * to touch the video data.
11 *
12 * device specific map/unmap/sync stuff now are mapped as operations
13 * to allow its usage by USB and virtual devices.
14 *
15 * (c) 2001-2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]
16 * (c) 2006 Mauro Carvalho Chehab <mchehab@infradead.org>
17 * (c) 2006 Ted Walther and John Sokol
18 *
19 * This program is free software; you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License as published by
21 * the Free Software Foundation; either version 2 of the License, or
22 * (at your option) any later version.
23 */
24
25 #include <linux/init.h>
26 #include <linux/module.h>
27 #include <linux/moduleparam.h>
28 #include <linux/vmalloc.h>
29 #include <linux/pagemap.h>
30 #include <linux/slab.h>
31 #include <linux/pci.h>
32 #include <linux/interrupt.h>
33 #include <asm/page.h>
34 #include <asm/pgtable.h>
35
36 #include <media/video-buf.h>
37
38 #define MAGIC_DMABUF 0x19721112
39 #define MAGIC_BUFFER 0x20040302
40 #define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \
41 { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }
42
43 static int debug = 0;
44 module_param(debug, int, 0644);
45
46 MODULE_DESCRIPTION("helper module to manage video4linux pci dma buffers");
47 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
48 MODULE_LICENSE("GPL");
49
50 #define dprintk(level, fmt, arg...) if (debug >= level) \
51 printk(KERN_DEBUG "vbuf: " fmt , ## arg)
52
53 struct scatterlist*
54 videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages)
55 {
56 struct scatterlist *sglist;
57 struct page *pg;
58 int i;
59
60 sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
61 if (NULL == sglist)
62 return NULL;
63 for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
64 pg = vmalloc_to_page(virt);
65 if (NULL == pg)
66 goto err;
67 BUG_ON(PageHighMem(pg));
68 sglist[i].page = pg;
69 sglist[i].length = PAGE_SIZE;
70 }
71 return sglist;
72
73 err:
74 kfree(sglist);
75 return NULL;
76 }
77
78 struct scatterlist*
79 videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset)
80 {
81 struct scatterlist *sglist;
82 int i = 0;
83
84 if (NULL == pages[0])
85 return NULL;
86 sglist = kcalloc(nr_pages, sizeof(*sglist), GFP_KERNEL);
87 if (NULL == sglist)
88 return NULL;
89
90 if (NULL == pages[0])
91 goto nopage;
92 if (PageHighMem(pages[0]))
93 /* DMA to highmem pages might not work */
94 goto highmem;
95 sglist[0].page = pages[0];
96 sglist[0].offset = offset;
97 sglist[0].length = PAGE_SIZE - offset;
98 for (i = 1; i < nr_pages; i++) {
99 if (NULL == pages[i])
100 goto nopage;
101 if (PageHighMem(pages[i]))
102 goto highmem;
103 sglist[i].page = pages[i];
104 sglist[i].length = PAGE_SIZE;
105 }
106 return sglist;
107
108 nopage:
109 dprintk(2,"sgl: oops - no page\n");
110 kfree(sglist);
111 return NULL;
112
113 highmem:
114 dprintk(2,"sgl: oops - highmem page\n");
115 kfree(sglist);
116 return NULL;
117 }
118
119 /* --------------------------------------------------------------------- */
120
121 void videobuf_dma_init(struct videobuf_dmabuf *dma)
122 {
123 memset(dma,0,sizeof(*dma));
124 dma->magic = MAGIC_DMABUF;
125 }
126
127 int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
128 unsigned long data, unsigned long size)
129 {
130 unsigned long first,last;
131 int err, rw = 0;
132
133 dma->direction = direction;
134 switch (dma->direction) {
135 case PCI_DMA_FROMDEVICE: rw = READ; break;
136 case PCI_DMA_TODEVICE: rw = WRITE; break;
137 default: BUG();
138 }
139
140 first = (data & PAGE_MASK) >> PAGE_SHIFT;
141 last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
142 dma->offset = data & ~PAGE_MASK;
143 dma->nr_pages = last-first+1;
144 dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*),
145 GFP_KERNEL);
146 if (NULL == dma->pages)
147 return -ENOMEM;
148 dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n",
149 data,size,dma->nr_pages);
150
151 dma->varea = (void *) data;
152
153 down_read(&current->mm->mmap_sem);
154 err = get_user_pages(current,current->mm,
155 data & PAGE_MASK, dma->nr_pages,
156 rw == READ, 1, /* force */
157 dma->pages, NULL);
158 up_read(&current->mm->mmap_sem);
159 if (err != dma->nr_pages) {
160 dma->nr_pages = (err >= 0) ? err : 0;
161 dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages);
162 return err < 0 ? err : -EINVAL;
163 }
164 return 0;
165 }
166
167 int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
168 int nr_pages)
169 {
170 dprintk(1,"init kernel [%d pages]\n",nr_pages);
171 dma->direction = direction;
172 dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT);
173 if (NULL == dma->vmalloc) {
174 dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages);
175 return -ENOMEM;
176 }
177 dprintk(1,"vmalloc is at addr 0x%08lx, size=%d\n",
178 (unsigned long)dma->vmalloc,
179 nr_pages << PAGE_SHIFT);
180 memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT);
181 dma->nr_pages = nr_pages;
182 return 0;
183 }
184
185 int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
186 dma_addr_t addr, int nr_pages)
187 {
188 dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n",
189 nr_pages,(unsigned long)addr);
190 dma->direction = direction;
191 if (0 == addr)
192 return -EINVAL;
193
194 dma->bus_addr = addr;
195 dma->nr_pages = nr_pages;
196 return 0;
197 }
198
199 int videobuf_dma_map(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
200 {
201 void *dev=q->dev;
202
203 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
204 BUG_ON(0 == dma->nr_pages);
205
206 if (dma->pages) {
207 dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
208 dma->offset);
209 }
210 if (dma->vmalloc) {
211 dma->sglist = videobuf_vmalloc_to_sg
212 (dma->vmalloc,dma->nr_pages);
213 }
214 if (dma->bus_addr) {
215 dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL);
216 if (NULL != dma->sglist) {
217 dma->sglen = 1;
218 sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK;
219 dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK;
220 sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE;
221 }
222 }
223 if (NULL == dma->sglist) {
224 dprintk(1,"scatterlist is NULL\n");
225 return -ENOMEM;
226 }
227 if (!dma->bus_addr) {
228 if (q->ops->vb_map_sg) {
229 dma->sglen = q->ops->vb_map_sg(dev,dma->sglist,
230 dma->nr_pages, dma->direction);
231 }
232 if (0 == dma->sglen) {
233 printk(KERN_WARNING
234 "%s: videobuf_map_sg failed\n",__FUNCTION__);
235 kfree(dma->sglist);
236 dma->sglist = NULL;
237 dma->sglen = 0;
238 return -EIO;
239 }
240 }
241 return 0;
242 }
243
244 int videobuf_dma_sync(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
245 {
246 void *dev=q->dev;
247
248 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
249 BUG_ON(!dma->sglen);
250
251 if (!dma->bus_addr && q->ops->vb_dma_sync_sg)
252 q->ops->vb_dma_sync_sg(dev,dma->sglist,dma->nr_pages,
253 dma->direction);
254
255 return 0;
256 }
257
258 int videobuf_dma_unmap(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
259 {
260 void *dev=q->dev;
261
262 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
263 if (!dma->sglen)
264 return 0;
265
266 if (!dma->bus_addr && q->ops->vb_unmap_sg)
267 q->ops->vb_unmap_sg(dev,dma->sglist,dma->nr_pages,
268 dma->direction);
269 kfree(dma->sglist);
270 dma->sglist = NULL;
271 dma->sglen = 0;
272 return 0;
273 }
274
275 int videobuf_dma_free(struct videobuf_dmabuf *dma)
276 {
277 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
278 BUG_ON(dma->sglen);
279
280 if (dma->pages) {
281 int i;
282 for (i=0; i < dma->nr_pages; i++)
283 page_cache_release(dma->pages[i]);
284 kfree(dma->pages);
285 dma->pages = NULL;
286 }
287
288 vfree(dma->vmalloc);
289 dma->vmalloc = NULL;
290 dma->varea = NULL;
291
292 if (dma->bus_addr) {
293 dma->bus_addr = 0;
294 }
295 dma->direction = PCI_DMA_NONE;
296 return 0;
297 }
298
299 /* --------------------------------------------------------------------- */
300
301 void* videobuf_alloc(unsigned int size)
302 {
303 struct videobuf_buffer *vb;
304
305 vb = kzalloc(size,GFP_KERNEL);
306 if (NULL != vb) {
307 videobuf_dma_init(&vb->dma);
308 init_waitqueue_head(&vb->done);
309 vb->magic = MAGIC_BUFFER;
310 }
311 return vb;
312 }
313
314 int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr)
315 {
316 int retval = 0;
317 DECLARE_WAITQUEUE(wait, current);
318
319 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
320 add_wait_queue(&vb->done, &wait);
321 while (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) {
322 if (non_blocking) {
323 retval = -EAGAIN;
324 break;
325 }
326 set_current_state(intr ? TASK_INTERRUPTIBLE
327 : TASK_UNINTERRUPTIBLE);
328 if (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED)
329 schedule();
330 set_current_state(TASK_RUNNING);
331 if (intr && signal_pending(current)) {
332 dprintk(1,"buffer waiton: -EINTR\n");
333 retval = -EINTR;
334 break;
335 }
336 }
337 remove_wait_queue(&vb->done, &wait);
338 return retval;
339 }
340
341 int
342 videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb,
343 struct v4l2_framebuffer *fbuf)
344 {
345 int err,pages;
346 dma_addr_t bus;
347
348 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
349 switch (vb->memory) {
350 case V4L2_MEMORY_MMAP:
351 case V4L2_MEMORY_USERPTR:
352 if (0 == vb->baddr) {
353 /* no userspace addr -- kernel bounce buffer */
354 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
355 err = videobuf_dma_init_kernel(&vb->dma,PCI_DMA_FROMDEVICE,
356 pages);
357 if (0 != err)
358 return err;
359 } else {
360 /* dma directly to userspace */
361 err = videobuf_dma_init_user(&vb->dma,PCI_DMA_FROMDEVICE,
362 vb->baddr,vb->bsize);
363 if (0 != err)
364 return err;
365 }
366 break;
367 case V4L2_MEMORY_OVERLAY:
368 if (NULL == fbuf)
369 return -EINVAL;
370 /* FIXME: need sanity checks for vb->boff */
371 /*
372 * Using a double cast to avoid compiler warnings when
373 * building for PAE. Compiler doesn't like direct casting
374 * of a 32 bit ptr to 64 bit integer.
375 */
376 bus = (dma_addr_t)(unsigned long)fbuf->base + vb->boff;
377 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
378 err = videobuf_dma_init_overlay(&vb->dma,PCI_DMA_FROMDEVICE,
379 bus, pages);
380 if (0 != err)
381 return err;
382 break;
383 default:
384 BUG();
385 }
386 err = videobuf_dma_map(q,&vb->dma);
387 if (0 != err)
388 return err;
389
390 return 0;
391 }
392
393 /* --------------------------------------------------------------------- */
394
395 void videobuf_queue_pci(struct videobuf_queue* q)
396 {
397 /* If not specified, defaults to PCI map sg */
398 if (!q->ops->vb_map_sg)
399 q->ops->vb_map_sg=(vb_map_sg_t *)pci_map_sg;
400
401 if (!q->ops->vb_dma_sync_sg)
402 q->ops->vb_dma_sync_sg=(vb_map_sg_t *)pci_dma_sync_sg_for_cpu;
403 if (!q->ops->vb_unmap_sg)
404 q->ops->vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
405 }
406
407 int videobuf_pci_dma_map(struct pci_dev *pci,struct videobuf_dmabuf *dma)
408 {
409 struct videobuf_queue q;
410 struct videobuf_queue_ops qops;
411
412 q.dev=pci;
413 qops.vb_map_sg=(vb_map_sg_t *)pci_map_sg;
414 qops.vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
415 q.ops = &qops;
416
417 return (videobuf_dma_map(&q,dma));
418 }
419
420 int videobuf_pci_dma_unmap(struct pci_dev *pci,struct videobuf_dmabuf *dma)
421 {
422 struct videobuf_queue q;
423 struct videobuf_queue_ops qops;
424
425 q.dev=pci;
426 qops.vb_map_sg=(vb_map_sg_t *)pci_map_sg;
427 qops.vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
428 q.ops = &qops;
429
430 return (videobuf_dma_unmap(&q,dma));
431 }
432
433 void videobuf_queue_init(struct videobuf_queue* q,
434 struct videobuf_queue_ops *ops,
435 void *dev,
436 spinlock_t *irqlock,
437 enum v4l2_buf_type type,
438 enum v4l2_field field,
439 unsigned int msize,
440 void *priv)
441 {
442 memset(q,0,sizeof(*q));
443 q->irqlock = irqlock;
444 q->dev = dev;
445 q->type = type;
446 q->field = field;
447 q->msize = msize;
448 q->ops = ops;
449 q->priv_data = priv;
450
451 videobuf_queue_pci(q);
452
453 mutex_init(&q->lock);
454 INIT_LIST_HEAD(&q->stream);
455 }
456
457 int
458 videobuf_queue_is_busy(struct videobuf_queue *q)
459 {
460 int i;
461
462 if (q->streaming) {
463 dprintk(1,"busy: streaming active\n");
464 return 1;
465 }
466 if (q->reading) {
467 dprintk(1,"busy: pending read #1\n");
468 return 1;
469 }
470 if (q->read_buf) {
471 dprintk(1,"busy: pending read #2\n");
472 return 1;
473 }
474 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
475 if (NULL == q->bufs[i])
476 continue;
477 if (q->bufs[i]->map) {
478 dprintk(1,"busy: buffer #%d mapped\n",i);
479 return 1;
480 }
481 if (q->bufs[i]->state == STATE_QUEUED) {
482 dprintk(1,"busy: buffer #%d queued\n",i);
483 return 1;
484 }
485 if (q->bufs[i]->state == STATE_ACTIVE) {
486 dprintk(1,"busy: buffer #%d avtive\n",i);
487 return 1;
488 }
489 }
490 return 0;
491 }
492
493 void
494 videobuf_queue_cancel(struct videobuf_queue *q)
495 {
496 unsigned long flags=0;
497 int i;
498
499 /* remove queued buffers from list */
500 if (q->irqlock)
501 spin_lock_irqsave(q->irqlock,flags);
502 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
503 if (NULL == q->bufs[i])
504 continue;
505 if (q->bufs[i]->state == STATE_QUEUED) {
506 list_del(&q->bufs[i]->queue);
507 q->bufs[i]->state = STATE_ERROR;
508 }
509 }
510 if (q->irqlock)
511 spin_unlock_irqrestore(q->irqlock,flags);
512
513 /* free all buffers + clear queue */
514 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
515 if (NULL == q->bufs[i])
516 continue;
517 q->ops->buf_release(q,q->bufs[i]);
518 }
519 INIT_LIST_HEAD(&q->stream);
520 }
521
522 /* --------------------------------------------------------------------- */
523
524 enum v4l2_field
525 videobuf_next_field(struct videobuf_queue *q)
526 {
527 enum v4l2_field field = q->field;
528
529 BUG_ON(V4L2_FIELD_ANY == field);
530
531 if (V4L2_FIELD_ALTERNATE == field) {
532 if (V4L2_FIELD_TOP == q->last) {
533 field = V4L2_FIELD_BOTTOM;
534 q->last = V4L2_FIELD_BOTTOM;
535 } else {
536 field = V4L2_FIELD_TOP;
537 q->last = V4L2_FIELD_TOP;
538 }
539 }
540 return field;
541 }
542
543 void
544 videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb,
545 enum v4l2_buf_type type)
546 {
547 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
548
549 b->index = vb->i;
550 b->type = type;
551
552 b->memory = vb->memory;
553 switch (b->memory) {
554 case V4L2_MEMORY_MMAP:
555 b->m.offset = vb->boff;
556 b->length = vb->bsize;
557 break;
558 case V4L2_MEMORY_USERPTR:
559 b->m.userptr = vb->baddr;
560 b->length = vb->bsize;
561 break;
562 case V4L2_MEMORY_OVERLAY:
563 b->m.offset = vb->boff;
564 break;
565 }
566
567 b->flags = 0;
568 if (vb->map)
569 b->flags |= V4L2_BUF_FLAG_MAPPED;
570
571 switch (vb->state) {
572 case STATE_PREPARED:
573 case STATE_QUEUED:
574 case STATE_ACTIVE:
575 b->flags |= V4L2_BUF_FLAG_QUEUED;
576 break;
577 case STATE_DONE:
578 case STATE_ERROR:
579 b->flags |= V4L2_BUF_FLAG_DONE;
580 break;
581 case STATE_NEEDS_INIT:
582 case STATE_IDLE:
583 /* nothing */
584 break;
585 }
586
587 if (vb->input != UNSET) {
588 b->flags |= V4L2_BUF_FLAG_INPUT;
589 b->input = vb->input;
590 }
591
592 b->field = vb->field;
593 b->timestamp = vb->ts;
594 b->bytesused = vb->size;
595 b->sequence = vb->field_count >> 1;
596 }
597
598 int
599 videobuf_reqbufs(struct videobuf_queue *q,
600 struct v4l2_requestbuffers *req)
601 {
602 unsigned int size,count;
603 int retval;
604
605 if (req->type != q->type) {
606 dprintk(1,"reqbufs: queue type invalid\n");
607 return -EINVAL;
608 }
609 if (req->count < 1) {
610 dprintk(1,"reqbufs: count invalid (%d)\n",req->count);
611 return -EINVAL;
612 }
613 if (req->memory != V4L2_MEMORY_MMAP &&
614 req->memory != V4L2_MEMORY_USERPTR &&
615 req->memory != V4L2_MEMORY_OVERLAY) {
616 dprintk(1,"reqbufs: memory type invalid\n");
617 return -EINVAL;
618 }
619
620 if (q->streaming) {
621 dprintk(1,"reqbufs: streaming already exists\n");
622 return -EBUSY;
623 }
624 if (!list_empty(&q->stream)) {
625 dprintk(1,"reqbufs: stream running\n");
626 return -EBUSY;
627 }
628
629 mutex_lock(&q->lock);
630 count = req->count;
631 if (count > VIDEO_MAX_FRAME)
632 count = VIDEO_MAX_FRAME;
633 size = 0;
634 q->ops->buf_setup(q,&count,&size);
635 size = PAGE_ALIGN(size);
636 dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n",
637 count, size, (count*size)>>PAGE_SHIFT);
638
639 retval = videobuf_mmap_setup(q,count,size,req->memory);
640 if (retval < 0) {
641 dprintk(1,"reqbufs: mmap setup returned %d\n",retval);
642 goto done;
643 }
644
645 req->count = count;
646
647 done:
648 mutex_unlock(&q->lock);
649 return retval;
650 }
651
652 int
653 videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
654 {
655 if (unlikely(b->type != q->type)) {
656 dprintk(1,"querybuf: Wrong type.\n");
657 return -EINVAL;
658 }
659 if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) {
660 dprintk(1,"querybuf: index out of range.\n");
661 return -EINVAL;
662 }
663 if (unlikely(NULL == q->bufs[b->index])) {
664 dprintk(1,"querybuf: buffer is null.\n");
665 return -EINVAL;
666 }
667 videobuf_status(b,q->bufs[b->index],q->type);
668 return 0;
669 }
670
671 int
672 videobuf_qbuf(struct videobuf_queue *q,
673 struct v4l2_buffer *b)
674 {
675 struct videobuf_buffer *buf;
676 enum v4l2_field field;
677 unsigned long flags=0;
678 int retval;
679
680 mutex_lock(&q->lock);
681 retval = -EBUSY;
682 if (q->reading) {
683 dprintk(1,"qbuf: Reading running...\n");
684 goto done;
685 }
686 retval = -EINVAL;
687 if (b->type != q->type) {
688 dprintk(1,"qbuf: Wrong type.\n");
689 goto done;
690 }
691 if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) {
692 dprintk(1,"qbuf: index out of range.\n");
693 goto done;
694 }
695 buf = q->bufs[b->index];
696 if (NULL == buf) {
697 dprintk(1,"qbuf: buffer is null.\n");
698 goto done;
699 }
700 MAGIC_CHECK(buf->magic,MAGIC_BUFFER);
701 if (buf->memory != b->memory) {
702 dprintk(1,"qbuf: memory type is wrong.\n");
703 goto done;
704 }
705 if (buf->state == STATE_QUEUED ||
706 buf->state == STATE_PREPARED ||
707 buf->state == STATE_ACTIVE) {
708 dprintk(1,"qbuf: buffer is already queued or active.\n");
709 goto done;
710 }
711
712 if (b->flags & V4L2_BUF_FLAG_INPUT) {
713 if (b->input >= q->inputs) {
714 dprintk(1,"qbuf: wrong input.\n");
715 goto done;
716 }
717 buf->input = b->input;
718 } else {
719 buf->input = UNSET;
720 }
721
722 switch (b->memory) {
723 case V4L2_MEMORY_MMAP:
724 if (0 == buf->baddr) {
725 dprintk(1,"qbuf: mmap requested but buffer addr is zero!\n");
726 goto done;
727 }
728 break;
729 case V4L2_MEMORY_USERPTR:
730 if (b->length < buf->bsize) {
731 dprintk(1,"qbuf: buffer length is not enough\n");
732 goto done;
733 }
734 if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr)
735 q->ops->buf_release(q,buf);
736 buf->baddr = b->m.userptr;
737 break;
738 case V4L2_MEMORY_OVERLAY:
739 buf->boff = b->m.offset;
740 break;
741 default:
742 dprintk(1,"qbuf: wrong memory type\n");
743 goto done;
744 }
745
746 dprintk(1,"qbuf: requesting next field\n");
747 field = videobuf_next_field(q);
748 retval = q->ops->buf_prepare(q,buf,field);
749 if (0 != retval) {
750 dprintk(1,"qbuf: buffer_prepare returned %d\n",retval);
751 goto done;
752 }
753
754 list_add_tail(&buf->stream,&q->stream);
755 if (q->streaming) {
756 if (q->irqlock)
757 spin_lock_irqsave(q->irqlock,flags);
758 q->ops->buf_queue(q,buf);
759 if (q->irqlock)
760 spin_unlock_irqrestore(q->irqlock,flags);
761 }
762 dprintk(1,"qbuf: succeded\n");
763 retval = 0;
764
765 done:
766 mutex_unlock(&q->lock);
767 return retval;
768 }
769
770 int
771 videobuf_dqbuf(struct videobuf_queue *q,
772 struct v4l2_buffer *b, int nonblocking)
773 {
774 struct videobuf_buffer *buf;
775 int retval;
776
777 mutex_lock(&q->lock);
778 retval = -EBUSY;
779 if (q->reading) {
780 dprintk(1,"dqbuf: Reading running...\n");
781 goto done;
782 }
783 retval = -EINVAL;
784 if (b->type != q->type) {
785 dprintk(1,"dqbuf: Wrong type.\n");
786 goto done;
787 }
788 if (list_empty(&q->stream)) {
789 dprintk(1,"dqbuf: stream running\n");
790 goto done;
791 }
792 buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
793 retval = videobuf_waiton(buf, nonblocking, 1);
794 if (retval < 0) {
795 dprintk(1,"dqbuf: waiton returned %d\n",retval);
796 goto done;
797 }
798 switch (buf->state) {
799 case STATE_ERROR:
800 dprintk(1,"dqbuf: state is error\n");
801 retval = -EIO;
802 videobuf_dma_sync(q,&buf->dma);
803 buf->state = STATE_IDLE;
804 break;
805 case STATE_DONE:
806 dprintk(1,"dqbuf: state is done\n");
807 videobuf_dma_sync(q,&buf->dma);
808 buf->state = STATE_IDLE;
809 break;
810 default:
811 dprintk(1,"dqbuf: state invalid\n");
812 retval = -EINVAL;
813 goto done;
814 }
815 list_del(&buf->stream);
816 memset(b,0,sizeof(*b));
817 videobuf_status(b,buf,q->type);
818
819 done:
820 mutex_unlock(&q->lock);
821 return retval;
822 }
823
824 int videobuf_streamon(struct videobuf_queue *q)
825 {
826 struct videobuf_buffer *buf;
827 struct list_head *list;
828 unsigned long flags=0;
829 int retval;
830
831 mutex_lock(&q->lock);
832 retval = -EBUSY;
833 if (q->reading)
834 goto done;
835 retval = 0;
836 if (q->streaming)
837 goto done;
838 q->streaming = 1;
839 if (q->irqlock)
840 spin_lock_irqsave(q->irqlock,flags);
841 list_for_each(list,&q->stream) {
842 buf = list_entry(list, struct videobuf_buffer, stream);
843 if (buf->state == STATE_PREPARED)
844 q->ops->buf_queue(q,buf);
845 }
846 if (q->irqlock)
847 spin_unlock_irqrestore(q->irqlock,flags);
848
849 done:
850 mutex_unlock(&q->lock);
851 return retval;
852 }
853
854 int videobuf_streamoff(struct videobuf_queue *q)
855 {
856 int retval = -EINVAL;
857
858 mutex_lock(&q->lock);
859 if (!q->streaming)
860 goto done;
861 videobuf_queue_cancel(q);
862 q->streaming = 0;
863 retval = 0;
864
865 done:
866 mutex_unlock(&q->lock);
867 return retval;
868 }
869
870 static ssize_t
871 videobuf_read_zerocopy(struct videobuf_queue *q, char __user *data,
872 size_t count, loff_t *ppos)
873 {
874 enum v4l2_field field;
875 unsigned long flags=0;
876 int retval;
877
878 /* setup stuff */
879 q->read_buf = videobuf_alloc(q->msize);
880 if (NULL == q->read_buf)
881 return -ENOMEM;
882
883 q->read_buf->memory = V4L2_MEMORY_USERPTR;
884 q->read_buf->baddr = (unsigned long)data;
885 q->read_buf->bsize = count;
886 field = videobuf_next_field(q);
887 retval = q->ops->buf_prepare(q,q->read_buf,field);
888 if (0 != retval)
889 goto done;
890
891 /* start capture & wait */
892 if (q->irqlock)
893 spin_lock_irqsave(q->irqlock,flags);
894 q->ops->buf_queue(q,q->read_buf);
895 if (q->irqlock)
896 spin_unlock_irqrestore(q->irqlock,flags);
897 retval = videobuf_waiton(q->read_buf,0,0);
898 if (0 == retval) {
899 videobuf_dma_sync(q,&q->read_buf->dma);
900 if (STATE_ERROR == q->read_buf->state)
901 retval = -EIO;
902 else
903 retval = q->read_buf->size;
904 }
905
906 done:
907 /* cleanup */
908 q->ops->buf_release(q,q->read_buf);
909 kfree(q->read_buf);
910 q->read_buf = NULL;
911 return retval;
912 }
913
914 ssize_t videobuf_read_one(struct videobuf_queue *q,
915 char __user *data, size_t count, loff_t *ppos,
916 int nonblocking)
917 {
918 enum v4l2_field field;
919 unsigned long flags=0;
920 unsigned size, nbufs, bytes;
921 int retval;
922
923 mutex_lock(&q->lock);
924
925 nbufs = 1; size = 0;
926 q->ops->buf_setup(q,&nbufs,&size);
927 if (NULL == q->read_buf &&
928 count >= size &&
929 !nonblocking) {
930 retval = videobuf_read_zerocopy(q,data,count,ppos);
931 if (retval >= 0 || retval == -EIO)
932 /* ok, all done */
933 goto done;
934 /* fallback to kernel bounce buffer on failures */
935 }
936
937 if (NULL == q->read_buf) {
938 /* need to capture a new frame */
939 retval = -ENOMEM;
940 q->read_buf = videobuf_alloc(q->msize);
941 dprintk(1,"video alloc=0x%p\n", q->read_buf);
942 if (NULL == q->read_buf)
943 goto done;
944 q->read_buf->memory = V4L2_MEMORY_USERPTR;
945 q->read_buf->bsize = count; /* preferred size */
946 field = videobuf_next_field(q);
947 retval = q->ops->buf_prepare(q,q->read_buf,field);
948 if (0 != retval) {
949 kfree (q->read_buf);
950 q->read_buf = NULL;
951 goto done;
952 }
953 if (q->irqlock)
954 spin_lock_irqsave(q->irqlock,flags);
955 q->ops->buf_queue(q,q->read_buf);
956 if (q->irqlock)
957 spin_unlock_irqrestore(q->irqlock,flags);
958 q->read_off = 0;
959 }
960
961 /* wait until capture is done */
962 retval = videobuf_waiton(q->read_buf, nonblocking, 1);
963 if (0 != retval)
964 goto done;
965 videobuf_dma_sync(q,&q->read_buf->dma);
966
967 if (STATE_ERROR == q->read_buf->state) {
968 /* catch I/O errors */
969 q->ops->buf_release(q,q->read_buf);
970 kfree(q->read_buf);
971 q->read_buf = NULL;
972 retval = -EIO;
973 goto done;
974 }
975
976 /* copy to userspace */
977 bytes = count;
978 if (bytes > q->read_buf->size - q->read_off)
979 bytes = q->read_buf->size - q->read_off;
980 retval = -EFAULT;
981 if (copy_to_user(data, q->read_buf->dma.vmalloc+q->read_off, bytes))
982 goto done;
983
984 retval = bytes;
985 q->read_off += bytes;
986 if (q->read_off == q->read_buf->size) {
987 /* all data copied, cleanup */
988 q->ops->buf_release(q,q->read_buf);
989 kfree(q->read_buf);
990 q->read_buf = NULL;
991 }
992
993 done:
994 mutex_unlock(&q->lock);
995 return retval;
996 }
997
998 int videobuf_read_start(struct videobuf_queue *q)
999 {
1000 enum v4l2_field field;
1001 unsigned long flags=0;
1002 int count = 0, size = 0;
1003 int err, i;
1004
1005 q->ops->buf_setup(q,&count,&size);
1006 if (count < 2)
1007 count = 2;
1008 if (count > VIDEO_MAX_FRAME)
1009 count = VIDEO_MAX_FRAME;
1010 size = PAGE_ALIGN(size);
1011
1012 err = videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR);
1013 if (err)
1014 return err;
1015 for (i = 0; i < count; i++) {
1016 field = videobuf_next_field(q);
1017 err = q->ops->buf_prepare(q,q->bufs[i],field);
1018 if (err)
1019 return err;
1020 list_add_tail(&q->bufs[i]->stream, &q->stream);
1021 }
1022 if (q->irqlock)
1023 spin_lock_irqsave(q->irqlock,flags);
1024 for (i = 0; i < count; i++)
1025 q->ops->buf_queue(q,q->bufs[i]);
1026 if (q->irqlock)
1027 spin_unlock_irqrestore(q->irqlock,flags);
1028 q->reading = 1;
1029 return 0;
1030 }
1031
1032 void videobuf_read_stop(struct videobuf_queue *q)
1033 {
1034 int i;
1035
1036 videobuf_queue_cancel(q);
1037 videobuf_mmap_free(q);
1038 INIT_LIST_HEAD(&q->stream);
1039 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1040 if (NULL == q->bufs[i])
1041 continue;
1042 kfree(q->bufs[i]);
1043 q->bufs[i] = NULL;
1044 }
1045 q->read_buf = NULL;
1046 q->reading = 0;
1047 }
1048
1049 ssize_t videobuf_read_stream(struct videobuf_queue *q,
1050 char __user *data, size_t count, loff_t *ppos,
1051 int vbihack, int nonblocking)
1052 {
1053 unsigned int *fc, bytes;
1054 int err, retval;
1055 unsigned long flags=0;
1056
1057 dprintk(2,"%s\n",__FUNCTION__);
1058 mutex_lock(&q->lock);
1059 retval = -EBUSY;
1060 if (q->streaming)
1061 goto done;
1062 if (!q->reading) {
1063 retval = videobuf_read_start(q);
1064 if (retval < 0)
1065 goto done;
1066 }
1067
1068 retval = 0;
1069 while (count > 0) {
1070 /* get / wait for data */
1071 if (NULL == q->read_buf) {
1072 q->read_buf = list_entry(q->stream.next,
1073 struct videobuf_buffer,
1074 stream);
1075 list_del(&q->read_buf->stream);
1076 q->read_off = 0;
1077 }
1078 err = videobuf_waiton(q->read_buf, nonblocking, 1);
1079 if (err < 0) {
1080 if (0 == retval)
1081 retval = err;
1082 break;
1083 }
1084
1085 if (q->read_buf->state == STATE_DONE) {
1086 if (vbihack) {
1087 /* dirty, undocumented hack -- pass the frame counter
1088 * within the last four bytes of each vbi data block.
1089 * We need that one to maintain backward compatibility
1090 * to all vbi decoding software out there ... */
1091 fc = (unsigned int*)q->read_buf->dma.vmalloc;
1092 fc += (q->read_buf->size>>2) -1;
1093 *fc = q->read_buf->field_count >> 1;
1094 dprintk(1,"vbihack: %d\n",*fc);
1095 }
1096
1097 /* copy stuff */
1098 bytes = count;
1099 if (bytes > q->read_buf->size - q->read_off)
1100 bytes = q->read_buf->size - q->read_off;
1101 if (copy_to_user(data + retval,
1102 q->read_buf->dma.vmalloc + q->read_off,
1103 bytes)) {
1104 if (0 == retval)
1105 retval = -EFAULT;
1106 break;
1107 }
1108 count -= bytes;
1109 retval += bytes;
1110 q->read_off += bytes;
1111 } else {
1112 /* some error */
1113 q->read_off = q->read_buf->size;
1114 if (0 == retval)
1115 retval = -EIO;
1116 }
1117
1118 /* requeue buffer when done with copying */
1119 if (q->read_off == q->read_buf->size) {
1120 list_add_tail(&q->read_buf->stream,
1121 &q->stream);
1122 if (q->irqlock)
1123 spin_lock_irqsave(q->irqlock,flags);
1124 q->ops->buf_queue(q,q->read_buf);
1125 if (q->irqlock)
1126 spin_unlock_irqrestore(q->irqlock,flags);
1127 q->read_buf = NULL;
1128 }
1129 if (retval < 0)
1130 break;
1131 }
1132
1133 done:
1134 mutex_unlock(&q->lock);
1135 return retval;
1136 }
1137
1138 unsigned int videobuf_poll_stream(struct file *file,
1139 struct videobuf_queue *q,
1140 poll_table *wait)
1141 {
1142 struct videobuf_buffer *buf = NULL;
1143 unsigned int rc = 0;
1144
1145 mutex_lock(&q->lock);
1146 if (q->streaming) {
1147 if (!list_empty(&q->stream))
1148 buf = list_entry(q->stream.next,
1149 struct videobuf_buffer, stream);
1150 } else {
1151 if (!q->reading)
1152 videobuf_read_start(q);
1153 if (!q->reading) {
1154 rc = POLLERR;
1155 } else if (NULL == q->read_buf) {
1156 q->read_buf = list_entry(q->stream.next,
1157 struct videobuf_buffer,
1158 stream);
1159 list_del(&q->read_buf->stream);
1160 q->read_off = 0;
1161 }
1162 buf = q->read_buf;
1163 }
1164 if (!buf)
1165 rc = POLLERR;
1166
1167 if (0 == rc) {
1168 poll_wait(file, &buf->done, wait);
1169 if (buf->state == STATE_DONE ||
1170 buf->state == STATE_ERROR)
1171 rc = POLLIN|POLLRDNORM;
1172 }
1173 mutex_unlock(&q->lock);
1174 return rc;
1175 }
1176
1177 /* --------------------------------------------------------------------- */
1178
1179 static void
1180 videobuf_vm_open(struct vm_area_struct *vma)
1181 {
1182 struct videobuf_mapping *map = vma->vm_private_data;
1183
1184 dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
1185 map->count,vma->vm_start,vma->vm_end);
1186 map->count++;
1187 }
1188
1189 static void
1190 videobuf_vm_close(struct vm_area_struct *vma)
1191 {
1192 struct videobuf_mapping *map = vma->vm_private_data;
1193 struct videobuf_queue *q = map->q;
1194 int i;
1195
1196 dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
1197 map->count,vma->vm_start,vma->vm_end);
1198
1199 map->count--;
1200 if (0 == map->count) {
1201 dprintk(1,"munmap %p q=%p\n",map,q);
1202 mutex_lock(&q->lock);
1203 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1204 if (NULL == q->bufs[i])
1205 continue;
1206 if (q->bufs[i])
1207 ;
1208 if (q->bufs[i]->map != map)
1209 continue;
1210 q->bufs[i]->map = NULL;
1211 q->bufs[i]->baddr = 0;
1212 q->ops->buf_release(q,q->bufs[i]);
1213 }
1214 mutex_unlock(&q->lock);
1215 kfree(map);
1216 }
1217 return;
1218 }
1219
1220 /*
1221 * Get a anonymous page for the mapping. Make sure we can DMA to that
1222 * memory location with 32bit PCI devices (i.e. don't use highmem for
1223 * now ...). Bounce buffers don't work very well for the data rates
1224 * video capture has.
1225 */
1226 static struct page*
1227 videobuf_vm_nopage(struct vm_area_struct *vma, unsigned long vaddr,
1228 int *type)
1229 {
1230 struct page *page;
1231
1232 dprintk(3,"nopage: fault @ %08lx [vma %08lx-%08lx]\n",
1233 vaddr,vma->vm_start,vma->vm_end);
1234 if (vaddr > vma->vm_end)
1235 return NOPAGE_SIGBUS;
1236 page = alloc_page(GFP_USER | __GFP_DMA32);
1237 if (!page)
1238 return NOPAGE_OOM;
1239 clear_user_page(page_address(page), vaddr, page);
1240 if (type)
1241 *type = VM_FAULT_MINOR;
1242 return page;
1243 }
1244
1245 static struct vm_operations_struct videobuf_vm_ops =
1246 {
1247 .open = videobuf_vm_open,
1248 .close = videobuf_vm_close,
1249 .nopage = videobuf_vm_nopage,
1250 };
1251
1252 int videobuf_mmap_setup(struct videobuf_queue *q,
1253 unsigned int bcount, unsigned int bsize,
1254 enum v4l2_memory memory)
1255 {
1256 unsigned int i;
1257 int err;
1258
1259 err = videobuf_mmap_free(q);
1260 if (0 != err)
1261 return err;
1262
1263 for (i = 0; i < bcount; i++) {
1264 q->bufs[i] = videobuf_alloc(q->msize);
1265 q->bufs[i]->i = i;
1266 q->bufs[i]->input = UNSET;
1267 q->bufs[i]->memory = memory;
1268 q->bufs[i]->bsize = bsize;
1269 switch (memory) {
1270 case V4L2_MEMORY_MMAP:
1271 q->bufs[i]->boff = bsize * i;
1272 break;
1273 case V4L2_MEMORY_USERPTR:
1274 case V4L2_MEMORY_OVERLAY:
1275 /* nothing */
1276 break;
1277 }
1278 }
1279 dprintk(1,"mmap setup: %d buffers, %d bytes each\n",
1280 bcount,bsize);
1281 return 0;
1282 }
1283
1284 int videobuf_mmap_free(struct videobuf_queue *q)
1285 {
1286 int i;
1287
1288 for (i = 0; i < VIDEO_MAX_FRAME; i++)
1289 if (q->bufs[i] && q->bufs[i]->map)
1290 return -EBUSY;
1291 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1292 if (NULL == q->bufs[i])
1293 continue;
1294 q->ops->buf_release(q,q->bufs[i]);
1295 kfree(q->bufs[i]);
1296 q->bufs[i] = NULL;
1297 }
1298 return 0;
1299 }
1300
1301 int videobuf_mmap_mapper(struct videobuf_queue *q,
1302 struct vm_area_struct *vma)
1303 {
1304 struct videobuf_mapping *map;
1305 unsigned int first,last,size,i;
1306 int retval;
1307
1308 mutex_lock(&q->lock);
1309 retval = -EINVAL;
1310 if (!(vma->vm_flags & VM_WRITE)) {
1311 dprintk(1,"mmap app bug: PROT_WRITE please\n");
1312 goto done;
1313 }
1314 if (!(vma->vm_flags & VM_SHARED)) {
1315 dprintk(1,"mmap app bug: MAP_SHARED please\n");
1316 goto done;
1317 }
1318
1319 /* look for first buffer to map */
1320 for (first = 0; first < VIDEO_MAX_FRAME; first++) {
1321 if (NULL == q->bufs[first])
1322 continue;
1323 if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
1324 continue;
1325 if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
1326 break;
1327 }
1328 if (VIDEO_MAX_FRAME == first) {
1329 dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
1330 (vma->vm_pgoff << PAGE_SHIFT));
1331 goto done;
1332 }
1333
1334 /* look for last buffer to map */
1335 for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
1336 if (NULL == q->bufs[last])
1337 continue;
1338 if (V4L2_MEMORY_MMAP != q->bufs[last]->memory)
1339 continue;
1340 if (q->bufs[last]->map) {
1341 retval = -EBUSY;
1342 goto done;
1343 }
1344 size += q->bufs[last]->bsize;
1345 if (size == (vma->vm_end - vma->vm_start))
1346 break;
1347 }
1348 if (VIDEO_MAX_FRAME == last) {
1349 dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n",
1350 (vma->vm_end - vma->vm_start));
1351 goto done;
1352 }
1353
1354 /* create mapping + update buffer list */
1355 retval = -ENOMEM;
1356 map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
1357 if (NULL == map)
1358 goto done;
1359 for (size = 0, i = first; i <= last; size += q->bufs[i++]->bsize) {
1360 q->bufs[i]->map = map;
1361 q->bufs[i]->baddr = vma->vm_start + size;
1362 }
1363 map->count = 1;
1364 map->start = vma->vm_start;
1365 map->end = vma->vm_end;
1366 map->q = q;
1367 vma->vm_ops = &videobuf_vm_ops;
1368 vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
1369 vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
1370 vma->vm_private_data = map;
1371 dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n",
1372 map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
1373 retval = 0;
1374
1375 done:
1376 mutex_unlock(&q->lock);
1377 return retval;
1378 }
1379
1380 /* --------------------------------------------------------------------- */
1381
1382 EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
1383
1384 EXPORT_SYMBOL_GPL(videobuf_dma_init);
1385 EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
1386 EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
1387 EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
1388 EXPORT_SYMBOL_GPL(videobuf_dma_map);
1389 EXPORT_SYMBOL_GPL(videobuf_dma_sync);
1390 EXPORT_SYMBOL_GPL(videobuf_dma_unmap);
1391 EXPORT_SYMBOL_GPL(videobuf_dma_free);
1392
1393 EXPORT_SYMBOL_GPL(videobuf_pci_dma_map);
1394 EXPORT_SYMBOL_GPL(videobuf_pci_dma_unmap);
1395
1396 EXPORT_SYMBOL_GPL(videobuf_alloc);
1397 EXPORT_SYMBOL_GPL(videobuf_waiton);
1398 EXPORT_SYMBOL_GPL(videobuf_iolock);
1399
1400 EXPORT_SYMBOL_GPL(videobuf_queue_init);
1401 EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
1402 EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
1403
1404 EXPORT_SYMBOL_GPL(videobuf_next_field);
1405 EXPORT_SYMBOL_GPL(videobuf_status);
1406 EXPORT_SYMBOL_GPL(videobuf_reqbufs);
1407 EXPORT_SYMBOL_GPL(videobuf_querybuf);
1408 EXPORT_SYMBOL_GPL(videobuf_qbuf);
1409 EXPORT_SYMBOL_GPL(videobuf_dqbuf);
1410 EXPORT_SYMBOL_GPL(videobuf_streamon);
1411 EXPORT_SYMBOL_GPL(videobuf_streamoff);
1412
1413 EXPORT_SYMBOL_GPL(videobuf_read_start);
1414 EXPORT_SYMBOL_GPL(videobuf_read_stop);
1415 EXPORT_SYMBOL_GPL(videobuf_read_stream);
1416 EXPORT_SYMBOL_GPL(videobuf_read_one);
1417 EXPORT_SYMBOL_GPL(videobuf_poll_stream);
1418
1419 EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
1420 EXPORT_SYMBOL_GPL(videobuf_mmap_free);
1421 EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);
1422
1423 /*
1424 * Local variables:
1425 * c-basic-offset: 8
1426 * End:
1427 */
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