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