Pull trivial1 into release branch
[linux-2.6] / drivers / media / video / video-buf.c
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         down_read(&current->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(&current->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
165 int 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
183 int 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
197 int 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
242 int 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
256 int 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
273 int 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
298 void* 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
311 int 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
338 int
339 videobuf_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                 bus   = (dma_addr_t)fbuf->base + vb->boff;
369                 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
370                 err = videobuf_dma_init_overlay(&vb->dma,PCI_DMA_FROMDEVICE,
371                                                 bus, pages);
372                 if (0 != err)
373                         return err;
374                 break;
375         default:
376                 BUG();
377         }
378         err = videobuf_dma_map(q,&vb->dma);
379         if (0 != err)
380                 return err;
381
382         return 0;
383 }
384
385 /* --------------------------------------------------------------------- */
386
387 void videobuf_queue_pci(struct videobuf_queue* q)
388 {
389         /* If not specified, defaults to PCI map sg */
390         if (!q->ops->vb_map_sg)
391                 q->ops->vb_map_sg=(vb_map_sg_t *)pci_map_sg;
392
393         if (!q->ops->vb_dma_sync_sg)
394                 q->ops->vb_dma_sync_sg=(vb_map_sg_t *)pci_dma_sync_sg_for_cpu;
395         if (!q->ops->vb_unmap_sg)
396                 q->ops->vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
397 }
398
399 int videobuf_pci_dma_map(struct pci_dev *pci,struct videobuf_dmabuf *dma)
400 {
401         struct videobuf_queue q;
402         struct videobuf_queue_ops qops;
403
404         q.dev=pci;
405         qops.vb_map_sg=(vb_map_sg_t *)pci_map_sg;
406         qops.vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
407         q.ops = &qops;
408
409         return (videobuf_dma_map(&q,dma));
410 }
411
412 int videobuf_pci_dma_unmap(struct pci_dev *pci,struct videobuf_dmabuf *dma)
413 {
414         struct videobuf_queue q;
415         struct videobuf_queue_ops qops;
416
417         q.dev=pci;
418         qops.vb_map_sg=(vb_map_sg_t *)pci_map_sg;
419         qops.vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
420         q.ops = &qops;
421
422         return (videobuf_dma_unmap(&q,dma));
423 }
424
425 void videobuf_queue_init(struct videobuf_queue* q,
426                          struct videobuf_queue_ops *ops,
427                          void *dev,
428                          spinlock_t *irqlock,
429                          enum v4l2_buf_type type,
430                          enum v4l2_field field,
431                          unsigned int msize,
432                          void *priv)
433 {
434         memset(q,0,sizeof(*q));
435         q->irqlock = irqlock;
436         q->dev     = dev;
437         q->type    = type;
438         q->field   = field;
439         q->msize   = msize;
440         q->ops     = ops;
441         q->priv_data = priv;
442
443         videobuf_queue_pci(q);
444
445         mutex_init(&q->lock);
446         INIT_LIST_HEAD(&q->stream);
447 }
448
449 int
450 videobuf_queue_is_busy(struct videobuf_queue *q)
451 {
452         int i;
453
454         if (q->streaming) {
455                 dprintk(1,"busy: streaming active\n");
456                 return 1;
457         }
458         if (q->reading) {
459                 dprintk(1,"busy: pending read #1\n");
460                 return 1;
461         }
462         if (q->read_buf) {
463                 dprintk(1,"busy: pending read #2\n");
464                 return 1;
465         }
466         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
467                 if (NULL == q->bufs[i])
468                         continue;
469                 if (q->bufs[i]->map) {
470                         dprintk(1,"busy: buffer #%d mapped\n",i);
471                         return 1;
472                 }
473                 if (q->bufs[i]->state == STATE_QUEUED) {
474                         dprintk(1,"busy: buffer #%d queued\n",i);
475                         return 1;
476                 }
477                 if (q->bufs[i]->state == STATE_ACTIVE) {
478                         dprintk(1,"busy: buffer #%d avtive\n",i);
479                         return 1;
480                 }
481         }
482         return 0;
483 }
484
485 void
486 videobuf_queue_cancel(struct videobuf_queue *q)
487 {
488         unsigned long flags=0;
489         int i;
490
491         /* remove queued buffers from list */
492         if (q->irqlock)
493                 spin_lock_irqsave(q->irqlock,flags);
494         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
495                 if (NULL == q->bufs[i])
496                         continue;
497                 if (q->bufs[i]->state == STATE_QUEUED) {
498                         list_del(&q->bufs[i]->queue);
499                         q->bufs[i]->state = STATE_ERROR;
500                 }
501         }
502         if (q->irqlock)
503                 spin_unlock_irqrestore(q->irqlock,flags);
504
505         /* free all buffers + clear queue */
506         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
507                 if (NULL == q->bufs[i])
508                         continue;
509                 q->ops->buf_release(q,q->bufs[i]);
510         }
511         INIT_LIST_HEAD(&q->stream);
512 }
513
514 /* --------------------------------------------------------------------- */
515
516 enum v4l2_field
517 videobuf_next_field(struct videobuf_queue *q)
518 {
519         enum v4l2_field field = q->field;
520
521         BUG_ON(V4L2_FIELD_ANY == field);
522
523         if (V4L2_FIELD_ALTERNATE == field) {
524                 if (V4L2_FIELD_TOP == q->last) {
525                         field   = V4L2_FIELD_BOTTOM;
526                         q->last = V4L2_FIELD_BOTTOM;
527                 } else {
528                         field   = V4L2_FIELD_TOP;
529                         q->last = V4L2_FIELD_TOP;
530                 }
531         }
532         return field;
533 }
534
535 void
536 videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb,
537                 enum v4l2_buf_type type)
538 {
539         MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
540
541         b->index    = vb->i;
542         b->type     = type;
543
544         b->memory   = vb->memory;
545         switch (b->memory) {
546         case V4L2_MEMORY_MMAP:
547                 b->m.offset  = vb->boff;
548                 b->length    = vb->bsize;
549                 break;
550         case V4L2_MEMORY_USERPTR:
551                 b->m.userptr = vb->baddr;
552                 b->length    = vb->bsize;
553                 break;
554         case V4L2_MEMORY_OVERLAY:
555                 b->m.offset  = vb->boff;
556                 break;
557         }
558
559         b->flags    = 0;
560         if (vb->map)
561                 b->flags |= V4L2_BUF_FLAG_MAPPED;
562
563         switch (vb->state) {
564         case STATE_PREPARED:
565         case STATE_QUEUED:
566         case STATE_ACTIVE:
567                 b->flags |= V4L2_BUF_FLAG_QUEUED;
568                 break;
569         case STATE_DONE:
570         case STATE_ERROR:
571                 b->flags |= V4L2_BUF_FLAG_DONE;
572                 break;
573         case STATE_NEEDS_INIT:
574         case STATE_IDLE:
575                 /* nothing */
576                 break;
577         }
578
579         if (vb->input != UNSET) {
580                 b->flags |= V4L2_BUF_FLAG_INPUT;
581                 b->input  = vb->input;
582         }
583
584         b->field     = vb->field;
585         b->timestamp = vb->ts;
586         b->bytesused = vb->size;
587         b->sequence  = vb->field_count >> 1;
588 }
589
590 int
591 videobuf_reqbufs(struct videobuf_queue *q,
592                  struct v4l2_requestbuffers *req)
593 {
594         unsigned int size,count;
595         int retval;
596
597         if (req->type != q->type) {
598                 dprintk(1,"reqbufs: queue type invalid\n");
599                 return -EINVAL;
600         }
601         if (req->count < 1) {
602                 dprintk(1,"reqbufs: count invalid (%d)\n",req->count);
603                 return -EINVAL;
604         }
605         if (req->memory != V4L2_MEMORY_MMAP     &&
606             req->memory != V4L2_MEMORY_USERPTR  &&
607             req->memory != V4L2_MEMORY_OVERLAY) {
608                 dprintk(1,"reqbufs: memory type invalid\n");
609                 return -EINVAL;
610         }
611
612         if (q->streaming) {
613                 dprintk(1,"reqbufs: streaming already exists\n");
614                 return -EBUSY;
615         }
616         if (!list_empty(&q->stream)) {
617                 dprintk(1,"reqbufs: stream running\n");
618                 return -EBUSY;
619         }
620
621         mutex_lock(&q->lock);
622         count = req->count;
623         if (count > VIDEO_MAX_FRAME)
624                 count = VIDEO_MAX_FRAME;
625         size = 0;
626         q->ops->buf_setup(q,&count,&size);
627         size = PAGE_ALIGN(size);
628         dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n",
629                 count, size, (count*size)>>PAGE_SHIFT);
630
631         retval = videobuf_mmap_setup(q,count,size,req->memory);
632         if (retval < 0) {
633                 dprintk(1,"reqbufs: mmap setup returned %d\n",retval);
634                 goto done;
635         }
636
637         req->count = count;
638
639  done:
640         mutex_unlock(&q->lock);
641         return retval;
642 }
643
644 int
645 videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
646 {
647         if (unlikely(b->type != q->type)) {
648                 dprintk(1,"querybuf: Wrong type.\n");
649                 return -EINVAL;
650         }
651         if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) {
652                 dprintk(1,"querybuf: index out of range.\n");
653                 return -EINVAL;
654         }
655         if (unlikely(NULL == q->bufs[b->index])) {
656                 dprintk(1,"querybuf: buffer is null.\n");
657                 return -EINVAL;
658         }
659         videobuf_status(b,q->bufs[b->index],q->type);
660         return 0;
661 }
662
663 int
664 videobuf_qbuf(struct videobuf_queue *q,
665               struct v4l2_buffer *b)
666 {
667         struct videobuf_buffer *buf;
668         enum v4l2_field field;
669         unsigned long flags=0;
670         int retval;
671
672         mutex_lock(&q->lock);
673         retval = -EBUSY;
674         if (q->reading) {
675                 dprintk(1,"qbuf: Reading running...\n");
676                 goto done;
677         }
678         retval = -EINVAL;
679         if (b->type != q->type) {
680                 dprintk(1,"qbuf: Wrong type.\n");
681                 goto done;
682         }
683         if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) {
684                 dprintk(1,"qbuf: index out of range.\n");
685                 goto done;
686         }
687         buf = q->bufs[b->index];
688         if (NULL == buf) {
689                 dprintk(1,"qbuf: buffer is null.\n");
690                 goto done;
691         }
692         MAGIC_CHECK(buf->magic,MAGIC_BUFFER);
693         if (buf->memory != b->memory) {
694                 dprintk(1,"qbuf: memory type is wrong.\n");
695                 goto done;
696         }
697         if (buf->state == STATE_QUEUED ||
698             buf->state == STATE_ACTIVE) {
699                 dprintk(1,"qbuf: buffer is already queued or active.\n");
700                 goto done;
701         }
702
703         if (b->flags & V4L2_BUF_FLAG_INPUT) {
704                 if (b->input >= q->inputs) {
705                         dprintk(1,"qbuf: wrong input.\n");
706                         goto done;
707                 }
708                 buf->input = b->input;
709         } else {
710                 buf->input = UNSET;
711         }
712
713         switch (b->memory) {
714         case V4L2_MEMORY_MMAP:
715                 if (0 == buf->baddr) {
716                         dprintk(1,"qbuf: mmap requested but buffer addr is zero!\n");
717                         goto done;
718                 }
719                 break;
720         case V4L2_MEMORY_USERPTR:
721                 if (b->length < buf->bsize) {
722                         dprintk(1,"qbuf: buffer length is not enough\n");
723                         goto done;
724                 }
725                 if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr)
726                         q->ops->buf_release(q,buf);
727                 buf->baddr = b->m.userptr;
728                 break;
729         case V4L2_MEMORY_OVERLAY:
730                 buf->boff = b->m.offset;
731                 break;
732         default:
733                 dprintk(1,"qbuf: wrong memory type\n");
734                 goto done;
735         }
736
737         dprintk(1,"qbuf: requesting next field\n");
738         field = videobuf_next_field(q);
739         retval = q->ops->buf_prepare(q,buf,field);
740         if (0 != retval) {
741                 dprintk(1,"qbuf: buffer_prepare returned %d\n",retval);
742                 goto done;
743         }
744
745         list_add_tail(&buf->stream,&q->stream);
746         if (q->streaming) {
747                 if (q->irqlock)
748                         spin_lock_irqsave(q->irqlock,flags);
749                 q->ops->buf_queue(q,buf);
750                 if (q->irqlock)
751                         spin_unlock_irqrestore(q->irqlock,flags);
752         }
753         dprintk(1,"qbuf: succeded\n");
754         retval = 0;
755
756  done:
757         mutex_unlock(&q->lock);
758         return retval;
759 }
760
761 int
762 videobuf_dqbuf(struct videobuf_queue *q,
763                struct v4l2_buffer *b, int nonblocking)
764 {
765         struct videobuf_buffer *buf;
766         int retval;
767
768         mutex_lock(&q->lock);
769         retval = -EBUSY;
770         if (q->reading) {
771                 dprintk(1,"dqbuf: Reading running...\n");
772                 goto done;
773         }
774         retval = -EINVAL;
775         if (b->type != q->type) {
776                 dprintk(1,"dqbuf: Wrong type.\n");
777                 goto done;
778         }
779         if (list_empty(&q->stream)) {
780                 dprintk(1,"dqbuf: stream running\n");
781                 goto done;
782         }
783         buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
784         retval = videobuf_waiton(buf, nonblocking, 1);
785         if (retval < 0) {
786                 dprintk(1,"dqbuf: waiton returned %d\n",retval);
787                 goto done;
788         }
789         switch (buf->state) {
790         case STATE_ERROR:
791                 dprintk(1,"dqbuf: state is error\n");
792                 retval = -EIO;
793                 videobuf_dma_sync(q,&buf->dma);
794                 buf->state = STATE_IDLE;
795                 break;
796         case STATE_DONE:
797                 dprintk(1,"dqbuf: state is done\n");
798                 videobuf_dma_sync(q,&buf->dma);
799                 buf->state = STATE_IDLE;
800                 break;
801         default:
802                 dprintk(1,"dqbuf: state invalid\n");
803                 retval = -EINVAL;
804                 goto done;
805         }
806         list_del(&buf->stream);
807         memset(b,0,sizeof(*b));
808         videobuf_status(b,buf,q->type);
809
810  done:
811         mutex_unlock(&q->lock);
812         return retval;
813 }
814
815 int videobuf_streamon(struct videobuf_queue *q)
816 {
817         struct videobuf_buffer *buf;
818         struct list_head *list;
819         unsigned long flags=0;
820         int retval;
821
822         mutex_lock(&q->lock);
823         retval = -EBUSY;
824         if (q->reading)
825                 goto done;
826         retval = 0;
827         if (q->streaming)
828                 goto done;
829         q->streaming = 1;
830         if (q->irqlock)
831                 spin_lock_irqsave(q->irqlock,flags);
832         list_for_each(list,&q->stream) {
833                 buf = list_entry(list, struct videobuf_buffer, stream);
834                 if (buf->state == STATE_PREPARED)
835                         q->ops->buf_queue(q,buf);
836         }
837         if (q->irqlock)
838                 spin_unlock_irqrestore(q->irqlock,flags);
839
840  done:
841         mutex_unlock(&q->lock);
842         return retval;
843 }
844
845 int videobuf_streamoff(struct videobuf_queue *q)
846 {
847         int retval = -EINVAL;
848
849         mutex_lock(&q->lock);
850         if (!q->streaming)
851                 goto done;
852         videobuf_queue_cancel(q);
853         q->streaming = 0;
854         retval = 0;
855
856  done:
857         mutex_unlock(&q->lock);
858         return retval;
859 }
860
861 static ssize_t
862 videobuf_read_zerocopy(struct videobuf_queue *q, char __user *data,
863                        size_t count, loff_t *ppos)
864 {
865         enum v4l2_field field;
866         unsigned long flags=0;
867         int retval;
868
869         /* setup stuff */
870         q->read_buf = videobuf_alloc(q->msize);
871         if (NULL == q->read_buf)
872                 return -ENOMEM;
873
874         q->read_buf->memory = V4L2_MEMORY_USERPTR;
875         q->read_buf->baddr  = (unsigned long)data;
876         q->read_buf->bsize  = count;
877         field = videobuf_next_field(q);
878         retval = q->ops->buf_prepare(q,q->read_buf,field);
879         if (0 != retval)
880                 goto done;
881
882         /* start capture & wait */
883         if (q->irqlock)
884                 spin_lock_irqsave(q->irqlock,flags);
885         q->ops->buf_queue(q,q->read_buf);
886         if (q->irqlock)
887                 spin_unlock_irqrestore(q->irqlock,flags);
888         retval = videobuf_waiton(q->read_buf,0,0);
889         if (0 == retval) {
890                 videobuf_dma_sync(q,&q->read_buf->dma);
891                 if (STATE_ERROR == q->read_buf->state)
892                         retval = -EIO;
893                 else
894                         retval = q->read_buf->size;
895         }
896
897  done:
898         /* cleanup */
899         q->ops->buf_release(q,q->read_buf);
900         kfree(q->read_buf);
901         q->read_buf = NULL;
902         return retval;
903 }
904
905 ssize_t videobuf_read_one(struct videobuf_queue *q,
906                           char __user *data, size_t count, loff_t *ppos,
907                           int nonblocking)
908 {
909         enum v4l2_field field;
910         unsigned long flags=0;
911         unsigned size, nbufs, bytes;
912         int retval;
913
914         mutex_lock(&q->lock);
915
916         nbufs = 1; size = 0;
917         q->ops->buf_setup(q,&nbufs,&size);
918         if (NULL == q->read_buf  &&
919             count >= size        &&
920             !nonblocking) {
921                 retval = videobuf_read_zerocopy(q,data,count,ppos);
922                 if (retval >= 0  ||  retval == -EIO)
923                         /* ok, all done */
924                         goto done;
925                 /* fallback to kernel bounce buffer on failures */
926         }
927
928         if (NULL == q->read_buf) {
929                 /* need to capture a new frame */
930                 retval = -ENOMEM;
931                 q->read_buf = videobuf_alloc(q->msize);
932                 dprintk(1,"video alloc=0x%p\n", q->read_buf);
933                 if (NULL == q->read_buf)
934                         goto done;
935                 q->read_buf->memory = V4L2_MEMORY_USERPTR;
936                 q->read_buf->bsize = count; /* preferred size */
937                 field = videobuf_next_field(q);
938                 retval = q->ops->buf_prepare(q,q->read_buf,field);
939                 if (0 != retval) {
940                         kfree (q->read_buf);
941                         q->read_buf = NULL;
942                         goto done;
943                 }
944                 if (q->irqlock)
945                         spin_lock_irqsave(q->irqlock,flags);
946                 q->ops->buf_queue(q,q->read_buf);
947                 if (q->irqlock)
948                         spin_unlock_irqrestore(q->irqlock,flags);
949                 q->read_off = 0;
950         }
951
952         /* wait until capture is done */
953         retval = videobuf_waiton(q->read_buf, nonblocking, 1);
954         if (0 != retval)
955                 goto done;
956         videobuf_dma_sync(q,&q->read_buf->dma);
957
958         if (STATE_ERROR == q->read_buf->state) {
959                 /* catch I/O errors */
960                 q->ops->buf_release(q,q->read_buf);
961                 kfree(q->read_buf);
962                 q->read_buf = NULL;
963                 retval = -EIO;
964                 goto done;
965         }
966
967         /* copy to userspace */
968         bytes = count;
969         if (bytes > q->read_buf->size - q->read_off)
970                 bytes = q->read_buf->size - q->read_off;
971         retval = -EFAULT;
972         if (copy_to_user(data, q->read_buf->dma.vmalloc+q->read_off, bytes))
973                 goto done;
974
975         retval = bytes;
976         q->read_off += bytes;
977         if (q->read_off == q->read_buf->size) {
978                 /* all data copied, cleanup */
979                 q->ops->buf_release(q,q->read_buf);
980                 kfree(q->read_buf);
981                 q->read_buf = NULL;
982         }
983
984  done:
985         mutex_unlock(&q->lock);
986         return retval;
987 }
988
989 int videobuf_read_start(struct videobuf_queue *q)
990 {
991         enum v4l2_field field;
992         unsigned long flags=0;
993         int count = 0, size = 0;
994         int err, i;
995
996         q->ops->buf_setup(q,&count,&size);
997         if (count < 2)
998                 count = 2;
999         if (count > VIDEO_MAX_FRAME)
1000                 count = VIDEO_MAX_FRAME;
1001         size = PAGE_ALIGN(size);
1002
1003         err = videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR);
1004         if (err)
1005                 return err;
1006         for (i = 0; i < count; i++) {
1007                 field = videobuf_next_field(q);
1008                 err = q->ops->buf_prepare(q,q->bufs[i],field);
1009                 if (err)
1010                         return err;
1011                 list_add_tail(&q->bufs[i]->stream, &q->stream);
1012         }
1013         if (q->irqlock)
1014                 spin_lock_irqsave(q->irqlock,flags);
1015         for (i = 0; i < count; i++)
1016                 q->ops->buf_queue(q,q->bufs[i]);
1017         if (q->irqlock)
1018                 spin_unlock_irqrestore(q->irqlock,flags);
1019         q->reading = 1;
1020         return 0;
1021 }
1022
1023 void videobuf_read_stop(struct videobuf_queue *q)
1024 {
1025         int i;
1026
1027         videobuf_queue_cancel(q);
1028         videobuf_mmap_free(q);
1029         INIT_LIST_HEAD(&q->stream);
1030         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1031                 if (NULL == q->bufs[i])
1032                         continue;
1033                 kfree(q->bufs[i]);
1034                 q->bufs[i] = NULL;
1035         }
1036         q->read_buf = NULL;
1037         q->reading  = 0;
1038 }
1039
1040 ssize_t videobuf_read_stream(struct videobuf_queue *q,
1041                              char __user *data, size_t count, loff_t *ppos,
1042                              int vbihack, int nonblocking)
1043 {
1044         unsigned int *fc, bytes;
1045         int err, retval;
1046         unsigned long flags=0;
1047
1048         dprintk(2,"%s\n",__FUNCTION__);
1049         mutex_lock(&q->lock);
1050         retval = -EBUSY;
1051         if (q->streaming)
1052                 goto done;
1053         if (!q->reading) {
1054                 retval = videobuf_read_start(q);
1055                 if (retval < 0)
1056                         goto done;
1057         }
1058
1059         retval = 0;
1060         while (count > 0) {
1061                 /* get / wait for data */
1062                 if (NULL == q->read_buf) {
1063                         q->read_buf = list_entry(q->stream.next,
1064                                                  struct videobuf_buffer,
1065                                                  stream);
1066                         list_del(&q->read_buf->stream);
1067                         q->read_off = 0;
1068                 }
1069                 err = videobuf_waiton(q->read_buf, nonblocking, 1);
1070                 if (err < 0) {
1071                         if (0 == retval)
1072                                 retval = err;
1073                         break;
1074                 }
1075
1076                 if (q->read_buf->state == STATE_DONE) {
1077                         if (vbihack) {
1078                                 /* dirty, undocumented hack -- pass the frame counter
1079                                  * within the last four bytes of each vbi data block.
1080                                  * We need that one to maintain backward compatibility
1081                                  * to all vbi decoding software out there ... */
1082                                 fc  = (unsigned int*)q->read_buf->dma.vmalloc;
1083                                 fc += (q->read_buf->size>>2) -1;
1084                                 *fc = q->read_buf->field_count >> 1;
1085                                 dprintk(1,"vbihack: %d\n",*fc);
1086                         }
1087
1088                         /* copy stuff */
1089                         bytes = count;
1090                         if (bytes > q->read_buf->size - q->read_off)
1091                                 bytes = q->read_buf->size - q->read_off;
1092                         if (copy_to_user(data + retval,
1093                                          q->read_buf->dma.vmalloc + q->read_off,
1094                                          bytes)) {
1095                                 if (0 == retval)
1096                                         retval = -EFAULT;
1097                                 break;
1098                         }
1099                         count       -= bytes;
1100                         retval      += bytes;
1101                         q->read_off += bytes;
1102                 } else {
1103                         /* some error */
1104                         q->read_off = q->read_buf->size;
1105                         if (0 == retval)
1106                                 retval = -EIO;
1107                 }
1108
1109                 /* requeue buffer when done with copying */
1110                 if (q->read_off == q->read_buf->size) {
1111                         list_add_tail(&q->read_buf->stream,
1112                                       &q->stream);
1113                         if (q->irqlock)
1114                                 spin_lock_irqsave(q->irqlock,flags);
1115                         q->ops->buf_queue(q,q->read_buf);
1116                         if (q->irqlock)
1117                                 spin_unlock_irqrestore(q->irqlock,flags);
1118                         q->read_buf = NULL;
1119                 }
1120                 if (retval < 0)
1121                         break;
1122         }
1123
1124  done:
1125         mutex_unlock(&q->lock);
1126         return retval;
1127 }
1128
1129 unsigned int videobuf_poll_stream(struct file *file,
1130                                   struct videobuf_queue *q,
1131                                   poll_table *wait)
1132 {
1133         struct videobuf_buffer *buf = NULL;
1134         unsigned int rc = 0;
1135
1136         mutex_lock(&q->lock);
1137         if (q->streaming) {
1138                 if (!list_empty(&q->stream))
1139                         buf = list_entry(q->stream.next,
1140                                          struct videobuf_buffer, stream);
1141         } else {
1142                 if (!q->reading)
1143                         videobuf_read_start(q);
1144                 if (!q->reading) {
1145                         rc = POLLERR;
1146                 } else if (NULL == q->read_buf) {
1147                         q->read_buf = list_entry(q->stream.next,
1148                                                  struct videobuf_buffer,
1149                                                  stream);
1150                         list_del(&q->read_buf->stream);
1151                         q->read_off = 0;
1152                 }
1153                 buf = q->read_buf;
1154         }
1155         if (!buf)
1156                 rc = POLLERR;
1157
1158         if (0 == rc) {
1159                 poll_wait(file, &buf->done, wait);
1160                 if (buf->state == STATE_DONE ||
1161                     buf->state == STATE_ERROR)
1162                         rc = POLLIN|POLLRDNORM;
1163         }
1164         mutex_unlock(&q->lock);
1165         return rc;
1166 }
1167
1168 /* --------------------------------------------------------------------- */
1169
1170 static void
1171 videobuf_vm_open(struct vm_area_struct *vma)
1172 {
1173         struct videobuf_mapping *map = vma->vm_private_data;
1174
1175         dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
1176                 map->count,vma->vm_start,vma->vm_end);
1177         map->count++;
1178 }
1179
1180 static void
1181 videobuf_vm_close(struct vm_area_struct *vma)
1182 {
1183         struct videobuf_mapping *map = vma->vm_private_data;
1184         struct videobuf_queue *q = map->q;
1185         int i;
1186
1187         dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
1188                 map->count,vma->vm_start,vma->vm_end);
1189
1190         map->count--;
1191         if (0 == map->count) {
1192                 dprintk(1,"munmap %p q=%p\n",map,q);
1193                 mutex_lock(&q->lock);
1194                 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1195                         if (NULL == q->bufs[i])
1196                                 continue;
1197                         if (q->bufs[i])
1198                                 ;
1199                         if (q->bufs[i]->map != map)
1200                                 continue;
1201                         q->bufs[i]->map   = NULL;
1202                         q->bufs[i]->baddr = 0;
1203                         q->ops->buf_release(q,q->bufs[i]);
1204                 }
1205                 mutex_unlock(&q->lock);
1206                 kfree(map);
1207         }
1208         return;
1209 }
1210
1211 /*
1212  * Get a anonymous page for the mapping.  Make sure we can DMA to that
1213  * memory location with 32bit PCI devices (i.e. don't use highmem for
1214  * now ...).  Bounce buffers don't work very well for the data rates
1215  * video capture has.
1216  */
1217 static struct page*
1218 videobuf_vm_nopage(struct vm_area_struct *vma, unsigned long vaddr,
1219                    int *type)
1220 {
1221         struct page *page;
1222
1223         dprintk(3,"nopage: fault @ %08lx [vma %08lx-%08lx]\n",
1224                 vaddr,vma->vm_start,vma->vm_end);
1225         if (vaddr > vma->vm_end)
1226                 return NOPAGE_SIGBUS;
1227         page = alloc_page(GFP_USER);
1228         if (!page)
1229                 return NOPAGE_OOM;
1230         clear_user_page(page_address(page), vaddr, page);
1231         if (type)
1232                 *type = VM_FAULT_MINOR;
1233         return page;
1234 }
1235
1236 static struct vm_operations_struct videobuf_vm_ops =
1237 {
1238         .open     = videobuf_vm_open,
1239         .close    = videobuf_vm_close,
1240         .nopage   = videobuf_vm_nopage,
1241 };
1242
1243 int videobuf_mmap_setup(struct videobuf_queue *q,
1244                         unsigned int bcount, unsigned int bsize,
1245                         enum v4l2_memory memory)
1246 {
1247         unsigned int i;
1248         int err;
1249
1250         err = videobuf_mmap_free(q);
1251         if (0 != err)
1252                 return err;
1253
1254         for (i = 0; i < bcount; i++) {
1255                 q->bufs[i] = videobuf_alloc(q->msize);
1256                 q->bufs[i]->i      = i;
1257                 q->bufs[i]->input  = UNSET;
1258                 q->bufs[i]->memory = memory;
1259                 q->bufs[i]->bsize  = bsize;
1260                 switch (memory) {
1261                 case V4L2_MEMORY_MMAP:
1262                         q->bufs[i]->boff  = bsize * i;
1263                         break;
1264                 case V4L2_MEMORY_USERPTR:
1265                 case V4L2_MEMORY_OVERLAY:
1266                         /* nothing */
1267                         break;
1268                 }
1269         }
1270         dprintk(1,"mmap setup: %d buffers, %d bytes each\n",
1271                 bcount,bsize);
1272         return 0;
1273 }
1274
1275 int videobuf_mmap_free(struct videobuf_queue *q)
1276 {
1277         int i;
1278
1279         for (i = 0; i < VIDEO_MAX_FRAME; i++)
1280                 if (q->bufs[i] && q->bufs[i]->map)
1281                         return -EBUSY;
1282         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1283                 if (NULL == q->bufs[i])
1284                         continue;
1285                 q->ops->buf_release(q,q->bufs[i]);
1286                 kfree(q->bufs[i]);
1287                 q->bufs[i] = NULL;
1288         }
1289         return 0;
1290 }
1291
1292 int videobuf_mmap_mapper(struct videobuf_queue *q,
1293                          struct vm_area_struct *vma)
1294 {
1295         struct videobuf_mapping *map;
1296         unsigned int first,last,size,i;
1297         int retval;
1298
1299         mutex_lock(&q->lock);
1300         retval = -EINVAL;
1301         if (!(vma->vm_flags & VM_WRITE)) {
1302                 dprintk(1,"mmap app bug: PROT_WRITE please\n");
1303                 goto done;
1304         }
1305         if (!(vma->vm_flags & VM_SHARED)) {
1306                 dprintk(1,"mmap app bug: MAP_SHARED please\n");
1307                 goto done;
1308         }
1309
1310         /* look for first buffer to map */
1311         for (first = 0; first < VIDEO_MAX_FRAME; first++) {
1312                 if (NULL == q->bufs[first])
1313                         continue;
1314                 if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
1315                         continue;
1316                 if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
1317                         break;
1318         }
1319         if (VIDEO_MAX_FRAME == first) {
1320                 dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
1321                         (vma->vm_pgoff << PAGE_SHIFT));
1322                 goto done;
1323         }
1324
1325         /* look for last buffer to map */
1326         for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
1327                 if (NULL == q->bufs[last])
1328                         continue;
1329                 if (V4L2_MEMORY_MMAP != q->bufs[last]->memory)
1330                         continue;
1331                 if (q->bufs[last]->map) {
1332                         retval = -EBUSY;
1333                         goto done;
1334                 }
1335                 size += q->bufs[last]->bsize;
1336                 if (size == (vma->vm_end - vma->vm_start))
1337                         break;
1338         }
1339         if (VIDEO_MAX_FRAME == last) {
1340                 dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n",
1341                         (vma->vm_end - vma->vm_start));
1342                 goto done;
1343         }
1344
1345         /* create mapping + update buffer list */
1346         retval = -ENOMEM;
1347         map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
1348         if (NULL == map)
1349                 goto done;
1350         for (size = 0, i = first; i <= last; size += q->bufs[i++]->bsize) {
1351                 q->bufs[i]->map   = map;
1352                 q->bufs[i]->baddr = vma->vm_start + size;
1353         }
1354         map->count    = 1;
1355         map->start    = vma->vm_start;
1356         map->end      = vma->vm_end;
1357         map->q        = q;
1358         vma->vm_ops   = &videobuf_vm_ops;
1359         vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
1360         vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
1361         vma->vm_private_data = map;
1362         dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n",
1363                 map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
1364         retval = 0;
1365
1366  done:
1367         mutex_unlock(&q->lock);
1368         return retval;
1369 }
1370
1371 /* --------------------------------------------------------------------- */
1372
1373 EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
1374
1375 EXPORT_SYMBOL_GPL(videobuf_dma_init);
1376 EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
1377 EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
1378 EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
1379 EXPORT_SYMBOL_GPL(videobuf_dma_map);
1380 EXPORT_SYMBOL_GPL(videobuf_dma_sync);
1381 EXPORT_SYMBOL_GPL(videobuf_dma_unmap);
1382 EXPORT_SYMBOL_GPL(videobuf_dma_free);
1383
1384 EXPORT_SYMBOL_GPL(videobuf_pci_dma_map);
1385 EXPORT_SYMBOL_GPL(videobuf_pci_dma_unmap);
1386
1387 EXPORT_SYMBOL_GPL(videobuf_alloc);
1388 EXPORT_SYMBOL_GPL(videobuf_waiton);
1389 EXPORT_SYMBOL_GPL(videobuf_iolock);
1390
1391 EXPORT_SYMBOL_GPL(videobuf_queue_init);
1392 EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
1393 EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
1394
1395 EXPORT_SYMBOL_GPL(videobuf_next_field);
1396 EXPORT_SYMBOL_GPL(videobuf_status);
1397 EXPORT_SYMBOL_GPL(videobuf_reqbufs);
1398 EXPORT_SYMBOL_GPL(videobuf_querybuf);
1399 EXPORT_SYMBOL_GPL(videobuf_qbuf);
1400 EXPORT_SYMBOL_GPL(videobuf_dqbuf);
1401 EXPORT_SYMBOL_GPL(videobuf_streamon);
1402 EXPORT_SYMBOL_GPL(videobuf_streamoff);
1403
1404 EXPORT_SYMBOL_GPL(videobuf_read_start);
1405 EXPORT_SYMBOL_GPL(videobuf_read_stop);
1406 EXPORT_SYMBOL_GPL(videobuf_read_stream);
1407 EXPORT_SYMBOL_GPL(videobuf_read_one);
1408 EXPORT_SYMBOL_GPL(videobuf_poll_stream);
1409
1410 EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
1411 EXPORT_SYMBOL_GPL(videobuf_mmap_free);
1412 EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);
1413
1414 /*
1415  * Local variables:
1416  * c-basic-offset: 8
1417  * End:
1418  */