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-rw-r--r--drivers/media/video/video-buf.c1424
1 files changed, 0 insertions, 1424 deletions
diff --git a/drivers/media/video/video-buf.c b/drivers/media/video/video-buf.c
deleted file mode 100644
index f6f31e1773d1..000000000000
--- a/drivers/media/video/video-buf.c
+++ /dev/null
@@ -1,1424 +0,0 @@
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/vmalloc.h>
28#include <linux/pagemap.h>
29#include <linux/slab.h>
30#include <linux/pci.h>
31#include <linux/interrupt.h>
32#include <asm/page.h>
33#include <asm/pgtable.h>
34
35#include <media/video-buf.h>
36
37#define MAGIC_DMABUF 0x19721112
38#define MAGIC_BUFFER 0x20040302
39#define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \
40 { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }
41
42static int debug = 0;
43module_param(debug, int, 0644);
44
45MODULE_DESCRIPTION("helper module to manage video4linux pci dma buffers");
46MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
47MODULE_LICENSE("GPL");
48
49#define dprintk(level, fmt, arg...) if (debug >= level) \
50 printk(KERN_DEBUG "vbuf: " fmt , ## arg)
51
52struct scatterlist*
53videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages)
54{
55 struct scatterlist *sglist;
56 struct page *pg;
57 int i;
58
59 sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
60 if (NULL == sglist)
61 return NULL;
62 for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
63 pg = vmalloc_to_page(virt);
64 if (NULL == pg)
65 goto err;
66 BUG_ON(PageHighMem(pg));
67 sglist[i].page = pg;
68 sglist[i].length = PAGE_SIZE;
69 }
70 return sglist;
71
72 err:
73 kfree(sglist);
74 return NULL;
75}
76
77struct scatterlist*
78videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset)
79{
80 struct scatterlist *sglist;
81 int i = 0;
82
83 if (NULL == pages[0])
84 return NULL;
85 sglist = kcalloc(nr_pages, sizeof(*sglist), GFP_KERNEL);
86 if (NULL == sglist)
87 return NULL;
88
89 if (NULL == pages[0])
90 goto nopage;
91 if (PageHighMem(pages[0]))
92 /* DMA to highmem pages might not work */
93 goto highmem;
94 sglist[0].page = pages[0];
95 sglist[0].offset = offset;
96 sglist[0].length = PAGE_SIZE - offset;
97 for (i = 1; i < nr_pages; i++) {
98 if (NULL == pages[i])
99 goto nopage;
100 if (PageHighMem(pages[i]))
101 goto highmem;
102 sglist[i].page = pages[i];
103 sglist[i].length = PAGE_SIZE;
104 }
105 return sglist;
106
107 nopage:
108 dprintk(2,"sgl: oops - no page\n");
109 kfree(sglist);
110 return NULL;
111
112 highmem:
113 dprintk(2,"sgl: oops - highmem page\n");
114 kfree(sglist);
115 return NULL;
116}
117
118/* --------------------------------------------------------------------- */
119
120void videobuf_dma_init(struct videobuf_dmabuf *dma)
121{
122 memset(dma,0,sizeof(*dma));
123 dma->magic = MAGIC_DMABUF;
124}
125
126int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
127 unsigned long data, unsigned long size)
128{
129 unsigned long first,last;
130 int err, rw = 0;
131
132 dma->direction = direction;
133 switch (dma->direction) {
134 case PCI_DMA_FROMDEVICE: rw = READ; break;
135 case PCI_DMA_TODEVICE: rw = WRITE; break;
136 default: BUG();
137 }
138
139 first = (data & PAGE_MASK) >> PAGE_SHIFT;
140 last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
141 dma->offset = data & ~PAGE_MASK;
142 dma->nr_pages = last-first+1;
143 dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*),
144 GFP_KERNEL);
145 if (NULL == dma->pages)
146 return -ENOMEM;
147 dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n",
148 data,size,dma->nr_pages);
149
150 dma->varea = (void *) data;
151
152 down_read(&current->mm->mmap_sem);
153 err = get_user_pages(current,current->mm,
154 data & PAGE_MASK, dma->nr_pages,
155 rw == READ, 1, /* force */
156 dma->pages, NULL);
157 up_read(&current->mm->mmap_sem);
158 if (err != dma->nr_pages) {
159 dma->nr_pages = (err >= 0) ? err : 0;
160 dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages);
161 return err < 0 ? err : -EINVAL;
162 }
163 return 0;
164}
165
166int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
167 int nr_pages)
168{
169 dprintk(1,"init kernel [%d pages]\n",nr_pages);
170 dma->direction = direction;
171 dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT);
172 if (NULL == dma->vmalloc) {
173 dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages);
174 return -ENOMEM;
175 }
176 dprintk(1,"vmalloc is at addr 0x%08lx, size=%d\n",
177 (unsigned long)dma->vmalloc,
178 nr_pages << PAGE_SHIFT);
179 memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT);
180 dma->nr_pages = nr_pages;
181 return 0;
182}
183
184int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
185 dma_addr_t addr, int nr_pages)
186{
187 dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n",
188 nr_pages,(unsigned long)addr);
189 dma->direction = direction;
190 if (0 == addr)
191 return -EINVAL;
192
193 dma->bus_addr = addr;
194 dma->nr_pages = nr_pages;
195 return 0;
196}
197
198int videobuf_dma_map(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
199{
200 void *dev=q->dev;
201
202 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
203 BUG_ON(0 == dma->nr_pages);
204
205 if (dma->pages) {
206 dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
207 dma->offset);
208 }
209 if (dma->vmalloc) {
210 dma->sglist = videobuf_vmalloc_to_sg
211 (dma->vmalloc,dma->nr_pages);
212 }
213 if (dma->bus_addr) {
214 dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL);
215 if (NULL != dma->sglist) {
216 dma->sglen = 1;
217 sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK;
218 dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK;
219 sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE;
220 }
221 }
222 if (NULL == dma->sglist) {
223 dprintk(1,"scatterlist is NULL\n");
224 return -ENOMEM;
225 }
226 if (!dma->bus_addr) {
227 if (q->ops->vb_map_sg) {
228 dma->sglen = q->ops->vb_map_sg(dev,dma->sglist,
229 dma->nr_pages, dma->direction);
230 }
231 if (0 == dma->sglen) {
232 printk(KERN_WARNING
233 "%s: videobuf_map_sg failed\n",__FUNCTION__);
234 kfree(dma->sglist);
235 dma->sglist = NULL;
236 dma->sglen = 0;
237 return -EIO;
238 }
239 }
240 return 0;
241}
242
243int videobuf_dma_sync(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
244{
245 void *dev=q->dev;
246
247 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
248 BUG_ON(!dma->sglen);
249
250 if (!dma->bus_addr && q->ops->vb_dma_sync_sg)
251 q->ops->vb_dma_sync_sg(dev,dma->sglist,dma->nr_pages,
252 dma->direction);
253
254 return 0;
255}
256
257int videobuf_dma_unmap(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
258{
259 void *dev=q->dev;
260
261 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
262 if (!dma->sglen)
263 return 0;
264
265 if (!dma->bus_addr && q->ops->vb_unmap_sg)
266 q->ops->vb_unmap_sg(dev,dma->sglist,dma->nr_pages,
267 dma->direction);
268 kfree(dma->sglist);
269 dma->sglist = NULL;
270 dma->sglen = 0;
271 return 0;
272}
273
274int videobuf_dma_free(struct videobuf_dmabuf *dma)
275{
276 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
277 BUG_ON(dma->sglen);
278
279 if (dma->pages) {
280 int i;
281 for (i=0; i < dma->nr_pages; i++)
282 page_cache_release(dma->pages[i]);
283 kfree(dma->pages);
284 dma->pages = NULL;
285 }
286
287 vfree(dma->vmalloc);
288 dma->vmalloc = NULL;
289 dma->varea = NULL;
290
291 if (dma->bus_addr) {
292 dma->bus_addr = 0;
293 }
294 dma->direction = PCI_DMA_NONE;
295 return 0;
296}
297
298/* --------------------------------------------------------------------- */
299
300void* videobuf_alloc(unsigned int size)
301{
302 struct videobuf_buffer *vb;
303
304 vb = kzalloc(size,GFP_KERNEL);
305 if (NULL != vb) {
306 videobuf_dma_init(&vb->dma);
307 init_waitqueue_head(&vb->done);
308 vb->magic = MAGIC_BUFFER;
309 }
310 return vb;
311}
312
313int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr)
314{
315 int retval = 0;
316 DECLARE_WAITQUEUE(wait, current);
317
318 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
319 add_wait_queue(&vb->done, &wait);
320 while (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) {
321 if (non_blocking) {
322 retval = -EAGAIN;
323 break;
324 }
325 set_current_state(intr ? TASK_INTERRUPTIBLE
326 : TASK_UNINTERRUPTIBLE);
327 if (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED)
328 schedule();
329 set_current_state(TASK_RUNNING);
330 if (intr && signal_pending(current)) {
331 dprintk(1,"buffer waiton: -EINTR\n");
332 retval = -EINTR;
333 break;
334 }
335 }
336 remove_wait_queue(&vb->done, &wait);
337 return retval;
338}
339
340int
341videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb,
342 struct v4l2_framebuffer *fbuf)
343{
344 int err,pages;
345 dma_addr_t bus;
346
347 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
348 switch (vb->memory) {
349 case V4L2_MEMORY_MMAP:
350 case V4L2_MEMORY_USERPTR:
351 if (0 == vb->baddr) {
352 /* no userspace addr -- kernel bounce buffer */
353 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
354 err = videobuf_dma_init_kernel(&vb->dma,PCI_DMA_FROMDEVICE,
355 pages);
356 if (0 != err)
357 return err;
358 } else {
359 /* dma directly to userspace */
360 err = videobuf_dma_init_user(&vb->dma,PCI_DMA_FROMDEVICE,
361 vb->baddr,vb->bsize);
362 if (0 != err)
363 return err;
364 }
365 break;
366 case V4L2_MEMORY_OVERLAY:
367 if (NULL == fbuf)
368 return -EINVAL;
369 /* FIXME: need sanity checks for vb->boff */
370 /*
371 * Using a double cast to avoid compiler warnings when
372 * building for PAE. Compiler doesn't like direct casting
373 * of a 32 bit ptr to 64 bit integer.
374 */
375 bus = (dma_addr_t)(unsigned long)fbuf->base + vb->boff;
376 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
377 err = videobuf_dma_init_overlay(&vb->dma,PCI_DMA_FROMDEVICE,
378 bus, pages);
379 if (0 != err)
380 return err;
381 break;
382 default:
383 BUG();
384 }
385 err = videobuf_dma_map(q,&vb->dma);
386 if (0 != err)
387 return err;
388
389 return 0;
390}
391
392/* --------------------------------------------------------------------- */
393
394void videobuf_queue_pci(struct videobuf_queue* q)
395{
396 /* If not specified, defaults to PCI map sg */
397 if (!q->ops->vb_map_sg)
398 q->ops->vb_map_sg=(vb_map_sg_t *)pci_map_sg;
399
400 if (!q->ops->vb_dma_sync_sg)
401 q->ops->vb_dma_sync_sg=(vb_map_sg_t *)pci_dma_sync_sg_for_cpu;
402 if (!q->ops->vb_unmap_sg)
403 q->ops->vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
404}
405
406int videobuf_pci_dma_map(struct pci_dev *pci,struct videobuf_dmabuf *dma)
407{
408 struct videobuf_queue q;
409 struct videobuf_queue_ops qops;
410
411 q.dev=pci;
412 qops.vb_map_sg=(vb_map_sg_t *)pci_map_sg;
413 qops.vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
414 q.ops = &qops;
415
416 return (videobuf_dma_map(&q,dma));
417}
418
419int videobuf_pci_dma_unmap(struct pci_dev *pci,struct videobuf_dmabuf *dma)
420{
421 struct videobuf_queue q;
422 struct videobuf_queue_ops qops;
423
424 q.dev=pci;
425 qops.vb_map_sg=(vb_map_sg_t *)pci_map_sg;
426 qops.vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
427 q.ops = &qops;
428
429 return (videobuf_dma_unmap(&q,dma));
430}
431
432void videobuf_queue_init(struct videobuf_queue* q,
433 struct videobuf_queue_ops *ops,
434 void *dev,
435 spinlock_t *irqlock,
436 enum v4l2_buf_type type,
437 enum v4l2_field field,
438 unsigned int msize,
439 void *priv)
440{
441 memset(q,0,sizeof(*q));
442 q->irqlock = irqlock;
443 q->dev = dev;
444 q->type = type;
445 q->field = field;
446 q->msize = msize;
447 q->ops = ops;
448 q->priv_data = priv;
449
450 videobuf_queue_pci(q);
451
452 mutex_init(&q->lock);
453 INIT_LIST_HEAD(&q->stream);
454}
455
456int
457videobuf_queue_is_busy(struct videobuf_queue *q)
458{
459 int i;
460
461 if (q->streaming) {
462 dprintk(1,"busy: streaming active\n");
463 return 1;
464 }
465 if (q->reading) {
466 dprintk(1,"busy: pending read #1\n");
467 return 1;
468 }
469 if (q->read_buf) {
470 dprintk(1,"busy: pending read #2\n");
471 return 1;
472 }
473 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
474 if (NULL == q->bufs[i])
475 continue;
476 if (q->bufs[i]->map) {
477 dprintk(1,"busy: buffer #%d mapped\n",i);
478 return 1;
479 }
480 if (q->bufs[i]->state == STATE_QUEUED) {
481 dprintk(1,"busy: buffer #%d queued\n",i);
482 return 1;
483 }
484 if (q->bufs[i]->state == STATE_ACTIVE) {
485 dprintk(1,"busy: buffer #%d avtive\n",i);
486 return 1;
487 }
488 }
489 return 0;
490}
491
492void
493videobuf_queue_cancel(struct videobuf_queue *q)
494{
495 unsigned long flags=0;
496 int i;
497
498 /* remove queued buffers from list */
499 if (q->irqlock)
500 spin_lock_irqsave(q->irqlock,flags);
501 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
502 if (NULL == q->bufs[i])
503 continue;
504 if (q->bufs[i]->state == STATE_QUEUED) {
505 list_del(&q->bufs[i]->queue);
506 q->bufs[i]->state = STATE_ERROR;
507 }
508 }
509 if (q->irqlock)
510 spin_unlock_irqrestore(q->irqlock,flags);
511
512 /* free all buffers + clear queue */
513 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
514 if (NULL == q->bufs[i])
515 continue;
516 q->ops->buf_release(q,q->bufs[i]);
517 }
518 INIT_LIST_HEAD(&q->stream);
519}
520
521/* --------------------------------------------------------------------- */
522
523enum v4l2_field
524videobuf_next_field(struct videobuf_queue *q)
525{
526 enum v4l2_field field = q->field;
527
528 BUG_ON(V4L2_FIELD_ANY == field);
529
530 if (V4L2_FIELD_ALTERNATE == field) {
531 if (V4L2_FIELD_TOP == q->last) {
532 field = V4L2_FIELD_BOTTOM;
533 q->last = V4L2_FIELD_BOTTOM;
534 } else {
535 field = V4L2_FIELD_TOP;
536 q->last = V4L2_FIELD_TOP;
537 }
538 }
539 return field;
540}
541
542void
543videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb,
544 enum v4l2_buf_type type)
545{
546 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
547
548 b->index = vb->i;
549 b->type = type;
550
551 b->memory = vb->memory;
552 switch (b->memory) {
553 case V4L2_MEMORY_MMAP:
554 b->m.offset = vb->boff;
555 b->length = vb->bsize;
556 break;
557 case V4L2_MEMORY_USERPTR:
558 b->m.userptr = vb->baddr;
559 b->length = vb->bsize;
560 break;
561 case V4L2_MEMORY_OVERLAY:
562 b->m.offset = vb->boff;
563 break;
564 }
565
566 b->flags = 0;
567 if (vb->map)
568 b->flags |= V4L2_BUF_FLAG_MAPPED;
569
570 switch (vb->state) {
571 case STATE_PREPARED:
572 case STATE_QUEUED:
573 case STATE_ACTIVE:
574 b->flags |= V4L2_BUF_FLAG_QUEUED;
575 break;
576 case STATE_DONE:
577 case STATE_ERROR:
578 b->flags |= V4L2_BUF_FLAG_DONE;
579 break;
580 case STATE_NEEDS_INIT:
581 case STATE_IDLE:
582 /* nothing */
583 break;
584 }
585
586 if (vb->input != UNSET) {
587 b->flags |= V4L2_BUF_FLAG_INPUT;
588 b->input = vb->input;
589 }
590
591 b->field = vb->field;
592 b->timestamp = vb->ts;
593 b->bytesused = vb->size;
594 b->sequence = vb->field_count >> 1;
595}
596
597int
598videobuf_reqbufs(struct videobuf_queue *q,
599 struct v4l2_requestbuffers *req)
600{
601 unsigned int size,count;
602 int retval;
603
604 if (req->type != q->type) {
605 dprintk(1,"reqbufs: queue type invalid\n");
606 return -EINVAL;
607 }
608 if (req->count < 1) {
609 dprintk(1,"reqbufs: count invalid (%d)\n",req->count);
610 return -EINVAL;
611 }
612 if (req->memory != V4L2_MEMORY_MMAP &&
613 req->memory != V4L2_MEMORY_USERPTR &&
614 req->memory != V4L2_MEMORY_OVERLAY) {
615 dprintk(1,"reqbufs: memory type invalid\n");
616 return -EINVAL;
617 }
618
619 if (q->streaming) {
620 dprintk(1,"reqbufs: streaming already exists\n");
621 return -EBUSY;
622 }
623 if (!list_empty(&q->stream)) {
624 dprintk(1,"reqbufs: stream running\n");
625 return -EBUSY;
626 }
627
628 mutex_lock(&q->lock);
629 count = req->count;
630 if (count > VIDEO_MAX_FRAME)
631 count = VIDEO_MAX_FRAME;
632 size = 0;
633 q->ops->buf_setup(q,&count,&size);
634 size = PAGE_ALIGN(size);
635 dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n",
636 count, size, (count*size)>>PAGE_SHIFT);
637
638 retval = videobuf_mmap_setup(q,count,size,req->memory);
639 if (retval < 0) {
640 dprintk(1,"reqbufs: mmap setup returned %d\n",retval);
641 goto done;
642 }
643
644 req->count = count;
645
646 done:
647 mutex_unlock(&q->lock);
648 return retval;
649}
650
651int
652videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
653{
654 if (unlikely(b->type != q->type)) {
655 dprintk(1,"querybuf: Wrong type.\n");
656 return -EINVAL;
657 }
658 if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) {
659 dprintk(1,"querybuf: index out of range.\n");
660 return -EINVAL;
661 }
662 if (unlikely(NULL == q->bufs[b->index])) {
663 dprintk(1,"querybuf: buffer is null.\n");
664 return -EINVAL;
665 }
666 videobuf_status(b,q->bufs[b->index],q->type);
667 return 0;
668}
669
670int
671videobuf_qbuf(struct videobuf_queue *q,
672 struct v4l2_buffer *b)
673{
674 struct videobuf_buffer *buf;
675 enum v4l2_field field;
676 unsigned long flags=0;
677 int retval;
678
679 mutex_lock(&q->lock);
680 retval = -EBUSY;
681 if (q->reading) {
682 dprintk(1,"qbuf: Reading running...\n");
683 goto done;
684 }
685 retval = -EINVAL;
686 if (b->type != q->type) {
687 dprintk(1,"qbuf: Wrong type.\n");
688 goto done;
689 }
690 if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) {
691 dprintk(1,"qbuf: index out of range.\n");
692 goto done;
693 }
694 buf = q->bufs[b->index];
695 if (NULL == buf) {
696 dprintk(1,"qbuf: buffer is null.\n");
697 goto done;
698 }
699 MAGIC_CHECK(buf->magic,MAGIC_BUFFER);
700 if (buf->memory != b->memory) {
701 dprintk(1,"qbuf: memory type is wrong.\n");
702 goto done;
703 }
704 if (buf->state != STATE_NEEDS_INIT && buf->state != STATE_IDLE) {
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 */
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-15 10:43:25 -0500