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