V4L/DVB (5123): Buf_qbuf: fix: videobuf_queue->stream corruption and lockup
[sfrench/cifs-2.6.git] / 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                 /*
369                  * Using a double cast to avoid compiler warnings when
370                  * building for PAE. Compiler doesn't like direct casting
371                  * of a 32 bit ptr to 64 bit integer.
372                  */
373                 bus   = (dma_addr_t)(unsigned long)fbuf->base + vb->boff;
374                 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
375                 err = videobuf_dma_init_overlay(&vb->dma,PCI_DMA_FROMDEVICE,
376                                                 bus, pages);
377                 if (0 != err)
378                         return err;
379                 break;
380         default:
381                 BUG();
382         }
383         err = videobuf_dma_map(q,&vb->dma);
384         if (0 != err)
385                 return err;
386
387         return 0;
388 }
389
390 /* --------------------------------------------------------------------- */
391
392 void videobuf_queue_pci(struct videobuf_queue* q)
393 {
394         /* If not specified, defaults to PCI map sg */
395         if (!q->ops->vb_map_sg)
396                 q->ops->vb_map_sg=(vb_map_sg_t *)pci_map_sg;
397
398         if (!q->ops->vb_dma_sync_sg)
399                 q->ops->vb_dma_sync_sg=(vb_map_sg_t *)pci_dma_sync_sg_for_cpu;
400         if (!q->ops->vb_unmap_sg)
401                 q->ops->vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
402 }
403
404 int videobuf_pci_dma_map(struct pci_dev *pci,struct videobuf_dmabuf *dma)
405 {
406         struct videobuf_queue q;
407         struct videobuf_queue_ops qops;
408
409         q.dev=pci;
410         qops.vb_map_sg=(vb_map_sg_t *)pci_map_sg;
411         qops.vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
412         q.ops = &qops;
413
414         return (videobuf_dma_map(&q,dma));
415 }
416
417 int videobuf_pci_dma_unmap(struct pci_dev *pci,struct videobuf_dmabuf *dma)
418 {
419         struct videobuf_queue q;
420         struct videobuf_queue_ops qops;
421
422         q.dev=pci;
423         qops.vb_map_sg=(vb_map_sg_t *)pci_map_sg;
424         qops.vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
425         q.ops = &qops;
426
427         return (videobuf_dma_unmap(&q,dma));
428 }
429
430 void videobuf_queue_init(struct videobuf_queue* q,
431                          struct videobuf_queue_ops *ops,
432                          void *dev,
433                          spinlock_t *irqlock,
434                          enum v4l2_buf_type type,
435                          enum v4l2_field field,
436                          unsigned int msize,
437                          void *priv)
438 {
439         memset(q,0,sizeof(*q));
440         q->irqlock = irqlock;
441         q->dev     = dev;
442         q->type    = type;
443         q->field   = field;
444         q->msize   = msize;
445         q->ops     = ops;
446         q->priv_data = priv;
447
448         videobuf_queue_pci(q);
449
450         mutex_init(&q->lock);
451         INIT_LIST_HEAD(&q->stream);
452 }
453
454 int
455 videobuf_queue_is_busy(struct videobuf_queue *q)
456 {
457         int i;
458
459         if (q->streaming) {
460                 dprintk(1,"busy: streaming active\n");
461                 return 1;
462         }
463         if (q->reading) {
464                 dprintk(1,"busy: pending read #1\n");
465                 return 1;
466         }
467         if (q->read_buf) {
468                 dprintk(1,"busy: pending read #2\n");
469                 return 1;
470         }
471         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
472                 if (NULL == q->bufs[i])
473                         continue;
474                 if (q->bufs[i]->map) {
475                         dprintk(1,"busy: buffer #%d mapped\n",i);
476                         return 1;
477                 }
478                 if (q->bufs[i]->state == STATE_QUEUED) {
479                         dprintk(1,"busy: buffer #%d queued\n",i);
480                         return 1;
481                 }
482                 if (q->bufs[i]->state == STATE_ACTIVE) {
483                         dprintk(1,"busy: buffer #%d avtive\n",i);
484                         return 1;
485                 }
486         }
487         return 0;
488 }
489
490 void
491 videobuf_queue_cancel(struct videobuf_queue *q)
492 {
493         unsigned long flags=0;
494         int i;
495
496         /* remove queued buffers from list */
497         if (q->irqlock)
498                 spin_lock_irqsave(q->irqlock,flags);
499         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
500                 if (NULL == q->bufs[i])
501                         continue;
502                 if (q->bufs[i]->state == STATE_QUEUED) {
503                         list_del(&q->bufs[i]->queue);
504                         q->bufs[i]->state = STATE_ERROR;
505                 }
506         }
507         if (q->irqlock)
508                 spin_unlock_irqrestore(q->irqlock,flags);
509
510         /* free all buffers + clear queue */
511         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
512                 if (NULL == q->bufs[i])
513                         continue;
514                 q->ops->buf_release(q,q->bufs[i]);
515         }
516         INIT_LIST_HEAD(&q->stream);
517 }
518
519 /* --------------------------------------------------------------------- */
520
521 enum v4l2_field
522 videobuf_next_field(struct videobuf_queue *q)
523 {
524         enum v4l2_field field = q->field;
525
526         BUG_ON(V4L2_FIELD_ANY == field);
527
528         if (V4L2_FIELD_ALTERNATE == field) {
529                 if (V4L2_FIELD_TOP == q->last) {
530                         field   = V4L2_FIELD_BOTTOM;
531                         q->last = V4L2_FIELD_BOTTOM;
532                 } else {
533                         field   = V4L2_FIELD_TOP;
534                         q->last = V4L2_FIELD_TOP;
535                 }
536         }
537         return field;
538 }
539
540 void
541 videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb,
542                 enum v4l2_buf_type type)
543 {
544         MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
545
546         b->index    = vb->i;
547         b->type     = type;
548
549         b->memory   = vb->memory;
550         switch (b->memory) {
551         case V4L2_MEMORY_MMAP:
552                 b->m.offset  = vb->boff;
553                 b->length    = vb->bsize;
554                 break;
555         case V4L2_MEMORY_USERPTR:
556                 b->m.userptr = vb->baddr;
557                 b->length    = vb->bsize;
558                 break;
559         case V4L2_MEMORY_OVERLAY:
560                 b->m.offset  = vb->boff;
561                 break;
562         }
563
564         b->flags    = 0;
565         if (vb->map)
566                 b->flags |= V4L2_BUF_FLAG_MAPPED;
567
568         switch (vb->state) {
569         case STATE_PREPARED:
570         case STATE_QUEUED:
571         case STATE_ACTIVE:
572                 b->flags |= V4L2_BUF_FLAG_QUEUED;
573                 break;
574         case STATE_DONE:
575         case STATE_ERROR:
576                 b->flags |= V4L2_BUF_FLAG_DONE;
577                 break;
578         case STATE_NEEDS_INIT:
579         case STATE_IDLE:
580                 /* nothing */
581                 break;
582         }
583
584         if (vb->input != UNSET) {
585                 b->flags |= V4L2_BUF_FLAG_INPUT;
586                 b->input  = vb->input;
587         }
588
589         b->field     = vb->field;
590         b->timestamp = vb->ts;
591         b->bytesused = vb->size;
592         b->sequence  = vb->field_count >> 1;
593 }
594
595 int
596 videobuf_reqbufs(struct videobuf_queue *q,
597                  struct v4l2_requestbuffers *req)
598 {
599         unsigned int size,count;
600         int retval;
601
602         if (req->type != q->type) {
603                 dprintk(1,"reqbufs: queue type invalid\n");
604                 return -EINVAL;
605         }
606         if (req->count < 1) {
607                 dprintk(1,"reqbufs: count invalid (%d)\n",req->count);
608                 return -EINVAL;
609         }
610         if (req->memory != V4L2_MEMORY_MMAP     &&
611             req->memory != V4L2_MEMORY_USERPTR  &&
612             req->memory != V4L2_MEMORY_OVERLAY) {
613                 dprintk(1,"reqbufs: memory type invalid\n");
614                 return -EINVAL;
615         }
616
617         if (q->streaming) {
618                 dprintk(1,"reqbufs: streaming already exists\n");
619                 return -EBUSY;
620         }
621         if (!list_empty(&q->stream)) {
622                 dprintk(1,"reqbufs: stream running\n");
623                 return -EBUSY;
624         }
625
626         mutex_lock(&q->lock);
627         count = req->count;
628         if (count > VIDEO_MAX_FRAME)
629                 count = VIDEO_MAX_FRAME;
630         size = 0;
631         q->ops->buf_setup(q,&count,&size);
632         size = PAGE_ALIGN(size);
633         dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n",
634                 count, size, (count*size)>>PAGE_SHIFT);
635
636         retval = videobuf_mmap_setup(q,count,size,req->memory);
637         if (retval < 0) {
638                 dprintk(1,"reqbufs: mmap setup returned %d\n",retval);
639                 goto done;
640         }
641
642         req->count = count;
643
644  done:
645         mutex_unlock(&q->lock);
646         return retval;
647 }
648
649 int
650 videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
651 {
652         if (unlikely(b->type != q->type)) {
653                 dprintk(1,"querybuf: Wrong type.\n");
654                 return -EINVAL;
655         }
656         if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) {
657                 dprintk(1,"querybuf: index out of range.\n");
658                 return -EINVAL;
659         }
660         if (unlikely(NULL == q->bufs[b->index])) {
661                 dprintk(1,"querybuf: buffer is null.\n");
662                 return -EINVAL;
663         }
664         videobuf_status(b,q->bufs[b->index],q->type);
665         return 0;
666 }
667
668 int
669 videobuf_qbuf(struct videobuf_queue *q,
670               struct v4l2_buffer *b)
671 {
672         struct videobuf_buffer *buf;
673         enum v4l2_field field;
674         unsigned long flags=0;
675         int retval;
676
677         mutex_lock(&q->lock);
678         retval = -EBUSY;
679         if (q->reading) {
680                 dprintk(1,"qbuf: Reading running...\n");
681                 goto done;
682         }
683         retval = -EINVAL;
684         if (b->type != q->type) {
685                 dprintk(1,"qbuf: Wrong type.\n");
686                 goto done;
687         }
688         if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) {
689                 dprintk(1,"qbuf: index out of range.\n");
690                 goto done;
691         }
692         buf = q->bufs[b->index];
693         if (NULL == buf) {
694                 dprintk(1,"qbuf: buffer is null.\n");
695                 goto done;
696         }
697         MAGIC_CHECK(buf->magic,MAGIC_BUFFER);
698         if (buf->memory != b->memory) {
699                 dprintk(1,"qbuf: memory type is wrong.\n");
700                 goto done;
701         }
702         if (buf->state == STATE_QUEUED ||
703             buf->state == STATE_PREPARED ||
704             buf->state == STATE_ACTIVE) {
705                 dprintk(1,"qbuf: buffer is already queued or active.\n");
706                 goto done;
707         }
708
709         if (b->flags & V4L2_BUF_FLAG_INPUT) {
710                 if (b->input >= q->inputs) {
711                         dprintk(1,"qbuf: wrong input.\n");
712                         goto done;
713                 }
714                 buf->input = b->input;
715         } else {
716                 buf->input = UNSET;
717         }
718
719         switch (b->memory) {
720         case V4L2_MEMORY_MMAP:
721                 if (0 == buf->baddr) {
722                         dprintk(1,"qbuf: mmap requested but buffer addr is zero!\n");
723                         goto done;
724                 }
725                 break;
726         case V4L2_MEMORY_USERPTR:
727                 if (b->length < buf->bsize) {
728                         dprintk(1,"qbuf: buffer length is not enough\n");
729                         goto done;
730                 }
731                 if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr)
732                         q->ops->buf_release(q,buf);
733                 buf->baddr = b->m.userptr;
734                 break;
735         case V4L2_MEMORY_OVERLAY:
736                 buf->boff = b->m.offset;
737                 break;
738         default:
739                 dprintk(1,"qbuf: wrong memory type\n");
740                 goto done;
741         }
742
743         dprintk(1,"qbuf: requesting next field\n");
744         field = videobuf_next_field(q);
745         retval = q->ops->buf_prepare(q,buf,field);
746         if (0 != retval) {
747                 dprintk(1,"qbuf: buffer_prepare returned %d\n",retval);
748                 goto done;
749         }
750
751         list_add_tail(&buf->stream,&q->stream);
752         if (q->streaming) {
753                 if (q->irqlock)
754                         spin_lock_irqsave(q->irqlock,flags);
755                 q->ops->buf_queue(q,buf);
756                 if (q->irqlock)
757                         spin_unlock_irqrestore(q->irqlock,flags);
758         }
759         dprintk(1,"qbuf: succeded\n");
760         retval = 0;
761
762  done:
763         mutex_unlock(&q->lock);
764         return retval;
765 }
766
767 int
768 videobuf_dqbuf(struct videobuf_queue *q,
769                struct v4l2_buffer *b, int nonblocking)
770 {
771         struct videobuf_buffer *buf;
772         int retval;
773
774         mutex_lock(&q->lock);
775         retval = -EBUSY;
776         if (q->reading) {
777                 dprintk(1,"dqbuf: Reading running...\n");
778                 goto done;
779         }
780         retval = -EINVAL;
781         if (b->type != q->type) {
782                 dprintk(1,"dqbuf: Wrong type.\n");
783                 goto done;
784         }
785         if (list_empty(&q->stream)) {
786                 dprintk(1,"dqbuf: stream running\n");
787                 goto done;
788         }
789         buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
790         retval = videobuf_waiton(buf, nonblocking, 1);
791         if (retval < 0) {
792                 dprintk(1,"dqbuf: waiton returned %d\n",retval);
793                 goto done;
794         }
795         switch (buf->state) {
796         case STATE_ERROR:
797                 dprintk(1,"dqbuf: state is error\n");
798                 retval = -EIO;
799                 videobuf_dma_sync(q,&buf->dma);
800                 buf->state = STATE_IDLE;
801                 break;
802         case STATE_DONE:
803                 dprintk(1,"dqbuf: state is done\n");
804                 videobuf_dma_sync(q,&buf->dma);
805                 buf->state = STATE_IDLE;
806                 break;
807         default:
808                 dprintk(1,"dqbuf: state invalid\n");
809                 retval = -EINVAL;
810                 goto done;
811         }
812         list_del(&buf->stream);
813         memset(b,0,sizeof(*b));
814         videobuf_status(b,buf,q->type);
815
816  done:
817         mutex_unlock(&q->lock);
818         return retval;
819 }
820
821 int videobuf_streamon(struct videobuf_queue *q)
822 {
823         struct videobuf_buffer *buf;
824         struct list_head *list;
825         unsigned long flags=0;
826         int retval;
827
828         mutex_lock(&q->lock);
829         retval = -EBUSY;
830         if (q->reading)
831                 goto done;
832         retval = 0;
833         if (q->streaming)
834                 goto done;
835         q->streaming = 1;
836         if (q->irqlock)
837                 spin_lock_irqsave(q->irqlock,flags);
838         list_for_each(list,&q->stream) {
839                 buf = list_entry(list, struct videobuf_buffer, stream);
840                 if (buf->state == STATE_PREPARED)
841                         q->ops->buf_queue(q,buf);
842         }
843         if (q->irqlock)
844                 spin_unlock_irqrestore(q->irqlock,flags);
845
846  done:
847         mutex_unlock(&q->lock);
848         return retval;
849 }
850
851 int videobuf_streamoff(struct videobuf_queue *q)
852 {
853         int retval = -EINVAL;
854
855         mutex_lock(&q->lock);
856         if (!q->streaming)
857                 goto done;
858         videobuf_queue_cancel(q);
859         q->streaming = 0;
860         retval = 0;
861
862  done:
863         mutex_unlock(&q->lock);
864         return retval;
865 }
866
867 static ssize_t
868 videobuf_read_zerocopy(struct videobuf_queue *q, char __user *data,
869                        size_t count, loff_t *ppos)
870 {
871         enum v4l2_field field;
872         unsigned long flags=0;
873         int retval;
874
875         /* setup stuff */
876         q->read_buf = videobuf_alloc(q->msize);
877         if (NULL == q->read_buf)
878                 return -ENOMEM;
879
880         q->read_buf->memory = V4L2_MEMORY_USERPTR;
881         q->read_buf->baddr  = (unsigned long)data;
882         q->read_buf->bsize  = count;
883         field = videobuf_next_field(q);
884         retval = q->ops->buf_prepare(q,q->read_buf,field);
885         if (0 != retval)
886                 goto done;
887
888         /* start capture & wait */
889         if (q->irqlock)
890                 spin_lock_irqsave(q->irqlock,flags);
891         q->ops->buf_queue(q,q->read_buf);
892         if (q->irqlock)
893                 spin_unlock_irqrestore(q->irqlock,flags);
894         retval = videobuf_waiton(q->read_buf,0,0);
895         if (0 == retval) {
896                 videobuf_dma_sync(q,&q->read_buf->dma);
897                 if (STATE_ERROR == q->read_buf->state)
898                         retval = -EIO;
899                 else
900                         retval = q->read_buf->size;
901         }
902
903  done:
904         /* cleanup */
905         q->ops->buf_release(q,q->read_buf);
906         kfree(q->read_buf);
907         q->read_buf = NULL;
908         return retval;
909 }
910
911 ssize_t videobuf_read_one(struct videobuf_queue *q,
912                           char __user *data, size_t count, loff_t *ppos,
913                           int nonblocking)
914 {
915         enum v4l2_field field;
916         unsigned long flags=0;
917         unsigned size, nbufs, bytes;
918         int retval;
919
920         mutex_lock(&q->lock);
921
922         nbufs = 1; size = 0;
923         q->ops->buf_setup(q,&nbufs,&size);
924         if (NULL == q->read_buf  &&
925             count >= size        &&
926             !nonblocking) {
927                 retval = videobuf_read_zerocopy(q,data,count,ppos);
928                 if (retval >= 0  ||  retval == -EIO)
929                         /* ok, all done */
930                         goto done;
931                 /* fallback to kernel bounce buffer on failures */
932         }
933
934         if (NULL == q->read_buf) {
935                 /* need to capture a new frame */
936                 retval = -ENOMEM;
937                 q->read_buf = videobuf_alloc(q->msize);
938                 dprintk(1,"video alloc=0x%p\n", q->read_buf);
939                 if (NULL == q->read_buf)
940                         goto done;
941                 q->read_buf->memory = V4L2_MEMORY_USERPTR;
942                 q->read_buf->bsize = count; /* preferred size */
943                 field = videobuf_next_field(q);
944                 retval = q->ops->buf_prepare(q,q->read_buf,field);
945                 if (0 != retval) {
946                         kfree (q->read_buf);
947                         q->read_buf = NULL;
948                         goto done;
949                 }
950                 if (q->irqlock)
951                         spin_lock_irqsave(q->irqlock,flags);
952                 q->ops->buf_queue(q,q->read_buf);
953                 if (q->irqlock)
954                         spin_unlock_irqrestore(q->irqlock,flags);
955                 q->read_off = 0;
956         }
957
958         /* wait until capture is done */
959         retval = videobuf_waiton(q->read_buf, nonblocking, 1);
960         if (0 != retval)
961                 goto done;
962         videobuf_dma_sync(q,&q->read_buf->dma);
963
964         if (STATE_ERROR == q->read_buf->state) {
965                 /* catch I/O errors */
966                 q->ops->buf_release(q,q->read_buf);
967                 kfree(q->read_buf);
968                 q->read_buf = NULL;
969                 retval = -EIO;
970                 goto done;
971         }
972
973         /* copy to userspace */
974         bytes = count;
975         if (bytes > q->read_buf->size - q->read_off)
976                 bytes = q->read_buf->size - q->read_off;
977         retval = -EFAULT;
978         if (copy_to_user(data, q->read_buf->dma.vmalloc+q->read_off, bytes))
979                 goto done;
980
981         retval = bytes;
982         q->read_off += bytes;
983         if (q->read_off == q->read_buf->size) {
984                 /* all data copied, cleanup */
985                 q->ops->buf_release(q,q->read_buf);
986                 kfree(q->read_buf);
987                 q->read_buf = NULL;
988         }
989
990  done:
991         mutex_unlock(&q->lock);
992         return retval;
993 }
994
995 int videobuf_read_start(struct videobuf_queue *q)
996 {
997         enum v4l2_field field;
998         unsigned long flags=0;
999         int count = 0, size = 0;
1000         int err, i;
1001
1002         q->ops->buf_setup(q,&count,&size);
1003         if (count < 2)
1004                 count = 2;
1005         if (count > VIDEO_MAX_FRAME)
1006                 count = VIDEO_MAX_FRAME;
1007         size = PAGE_ALIGN(size);
1008
1009         err = videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR);
1010         if (err)
1011                 return err;
1012         for (i = 0; i < count; i++) {
1013                 field = videobuf_next_field(q);
1014                 err = q->ops->buf_prepare(q,q->bufs[i],field);
1015                 if (err)
1016                         return err;
1017                 list_add_tail(&q->bufs[i]->stream, &q->stream);
1018         }
1019         if (q->irqlock)
1020                 spin_lock_irqsave(q->irqlock,flags);
1021         for (i = 0; i < count; i++)
1022                 q->ops->buf_queue(q,q->bufs[i]);
1023         if (q->irqlock)
1024                 spin_unlock_irqrestore(q->irqlock,flags);
1025         q->reading = 1;
1026         return 0;
1027 }
1028
1029 void videobuf_read_stop(struct videobuf_queue *q)
1030 {
1031         int i;
1032
1033         videobuf_queue_cancel(q);
1034         videobuf_mmap_free(q);
1035         INIT_LIST_HEAD(&q->stream);
1036         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1037                 if (NULL == q->bufs[i])
1038                         continue;
1039                 kfree(q->bufs[i]);
1040                 q->bufs[i] = NULL;
1041         }
1042         q->read_buf = NULL;
1043         q->reading  = 0;
1044 }
1045
1046 ssize_t videobuf_read_stream(struct videobuf_queue *q,
1047                              char __user *data, size_t count, loff_t *ppos,
1048                              int vbihack, int nonblocking)
1049 {
1050         unsigned int *fc, bytes;
1051         int err, retval;
1052         unsigned long flags=0;
1053
1054         dprintk(2,"%s\n",__FUNCTION__);
1055         mutex_lock(&q->lock);
1056         retval = -EBUSY;
1057         if (q->streaming)
1058                 goto done;
1059         if (!q->reading) {
1060                 retval = videobuf_read_start(q);
1061                 if (retval < 0)
1062                         goto done;
1063         }
1064
1065         retval = 0;
1066         while (count > 0) {
1067                 /* get / wait for data */
1068                 if (NULL == q->read_buf) {
1069                         q->read_buf = list_entry(q->stream.next,
1070                                                  struct videobuf_buffer,
1071                                                  stream);
1072                         list_del(&q->read_buf->stream);
1073                         q->read_off = 0;
1074                 }
1075                 err = videobuf_waiton(q->read_buf, nonblocking, 1);
1076                 if (err < 0) {
1077                         if (0 == retval)
1078                                 retval = err;
1079                         break;
1080                 }
1081
1082                 if (q->read_buf->state == STATE_DONE) {
1083                         if (vbihack) {
1084                                 /* dirty, undocumented hack -- pass the frame counter
1085                                  * within the last four bytes of each vbi data block.
1086                                  * We need that one to maintain backward compatibility
1087                                  * to all vbi decoding software out there ... */
1088                                 fc  = (unsigned int*)q->read_buf->dma.vmalloc;
1089                                 fc += (q->read_buf->size>>2) -1;
1090                                 *fc = q->read_buf->field_count >> 1;
1091                                 dprintk(1,"vbihack: %d\n",*fc);
1092                         }
1093
1094                         /* copy stuff */
1095                         bytes = count;
1096                         if (bytes > q->read_buf->size - q->read_off)
1097                                 bytes = q->read_buf->size - q->read_off;
1098                         if (copy_to_user(data + retval,
1099                                          q->read_buf->dma.vmalloc + q->read_off,
1100                                          bytes)) {
1101                                 if (0 == retval)
1102                                         retval = -EFAULT;
1103                                 break;
1104                         }
1105                         count       -= bytes;
1106                         retval      += bytes;
1107                         q->read_off += bytes;
1108                 } else {
1109                         /* some error */
1110                         q->read_off = q->read_buf->size;
1111                         if (0 == retval)
1112                                 retval = -EIO;
1113                 }
1114
1115                 /* requeue buffer when done with copying */
1116                 if (q->read_off == q->read_buf->size) {
1117                         list_add_tail(&q->read_buf->stream,
1118                                       &q->stream);
1119                         if (q->irqlock)
1120                                 spin_lock_irqsave(q->irqlock,flags);
1121                         q->ops->buf_queue(q,q->read_buf);
1122                         if (q->irqlock)
1123                                 spin_unlock_irqrestore(q->irqlock,flags);
1124                         q->read_buf = NULL;
1125                 }
1126                 if (retval < 0)
1127                         break;
1128         }
1129
1130  done:
1131         mutex_unlock(&q->lock);
1132         return retval;
1133 }
1134
1135 unsigned int videobuf_poll_stream(struct file *file,
1136                                   struct videobuf_queue *q,
1137                                   poll_table *wait)
1138 {
1139         struct videobuf_buffer *buf = NULL;
1140         unsigned int rc = 0;
1141
1142         mutex_lock(&q->lock);
1143         if (q->streaming) {
1144                 if (!list_empty(&q->stream))
1145                         buf = list_entry(q->stream.next,
1146                                          struct videobuf_buffer, stream);
1147         } else {
1148                 if (!q->reading)
1149                         videobuf_read_start(q);
1150                 if (!q->reading) {
1151                         rc = POLLERR;
1152                 } else if (NULL == q->read_buf) {
1153                         q->read_buf = list_entry(q->stream.next,
1154                                                  struct videobuf_buffer,
1155                                                  stream);
1156                         list_del(&q->read_buf->stream);
1157                         q->read_off = 0;
1158                 }
1159                 buf = q->read_buf;
1160         }
1161         if (!buf)
1162                 rc = POLLERR;
1163
1164         if (0 == rc) {
1165                 poll_wait(file, &buf->done, wait);
1166                 if (buf->state == STATE_DONE ||
1167                     buf->state == STATE_ERROR)
1168                         rc = POLLIN|POLLRDNORM;
1169         }
1170         mutex_unlock(&q->lock);
1171         return rc;
1172 }
1173
1174 /* --------------------------------------------------------------------- */
1175
1176 static void
1177 videobuf_vm_open(struct vm_area_struct *vma)
1178 {
1179         struct videobuf_mapping *map = vma->vm_private_data;
1180
1181         dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
1182                 map->count,vma->vm_start,vma->vm_end);
1183         map->count++;
1184 }
1185
1186 static void
1187 videobuf_vm_close(struct vm_area_struct *vma)
1188 {
1189         struct videobuf_mapping *map = vma->vm_private_data;
1190         struct videobuf_queue *q = map->q;
1191         int i;
1192
1193         dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
1194                 map->count,vma->vm_start,vma->vm_end);
1195
1196         map->count--;
1197         if (0 == map->count) {
1198                 dprintk(1,"munmap %p q=%p\n",map,q);
1199                 mutex_lock(&q->lock);
1200                 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1201                         if (NULL == q->bufs[i])
1202                                 continue;
1203                         if (q->bufs[i])
1204                                 ;
1205                         if (q->bufs[i]->map != map)
1206                                 continue;
1207                         q->bufs[i]->map   = NULL;
1208                         q->bufs[i]->baddr = 0;
1209                         q->ops->buf_release(q,q->bufs[i]);
1210                 }
1211                 mutex_unlock(&q->lock);
1212                 kfree(map);
1213         }
1214         return;
1215 }
1216
1217 /*
1218  * Get a anonymous page for the mapping.  Make sure we can DMA to that
1219  * memory location with 32bit PCI devices (i.e. don't use highmem for
1220  * now ...).  Bounce buffers don't work very well for the data rates
1221  * video capture has.
1222  */
1223 static struct page*
1224 videobuf_vm_nopage(struct vm_area_struct *vma, unsigned long vaddr,
1225                    int *type)
1226 {
1227         struct page *page;
1228
1229         dprintk(3,"nopage: fault @ %08lx [vma %08lx-%08lx]\n",
1230                 vaddr,vma->vm_start,vma->vm_end);
1231         if (vaddr > vma->vm_end)
1232                 return NOPAGE_SIGBUS;
1233         page = alloc_page(GFP_USER | __GFP_DMA32);
1234         if (!page)
1235                 return NOPAGE_OOM;
1236         clear_user_page(page_address(page), vaddr, page);
1237         if (type)
1238                 *type = VM_FAULT_MINOR;
1239         return page;
1240 }
1241
1242 static struct vm_operations_struct videobuf_vm_ops =
1243 {
1244         .open     = videobuf_vm_open,
1245         .close    = videobuf_vm_close,
1246         .nopage   = videobuf_vm_nopage,
1247 };
1248
1249 int videobuf_mmap_setup(struct videobuf_queue *q,
1250                         unsigned int bcount, unsigned int bsize,
1251                         enum v4l2_memory memory)
1252 {
1253         unsigned int i;
1254         int err;
1255
1256         err = videobuf_mmap_free(q);
1257         if (0 != err)
1258                 return err;
1259
1260         for (i = 0; i < bcount; i++) {
1261                 q->bufs[i] = videobuf_alloc(q->msize);
1262                 q->bufs[i]->i      = i;
1263                 q->bufs[i]->input  = UNSET;
1264                 q->bufs[i]->memory = memory;
1265                 q->bufs[i]->bsize  = bsize;
1266                 switch (memory) {
1267                 case V4L2_MEMORY_MMAP:
1268                         q->bufs[i]->boff  = bsize * i;
1269                         break;
1270                 case V4L2_MEMORY_USERPTR:
1271                 case V4L2_MEMORY_OVERLAY:
1272                         /* nothing */
1273                         break;
1274                 }
1275         }
1276         dprintk(1,"mmap setup: %d buffers, %d bytes each\n",
1277                 bcount,bsize);
1278         return 0;
1279 }
1280
1281 int videobuf_mmap_free(struct videobuf_queue *q)
1282 {
1283         int i;
1284
1285         for (i = 0; i < VIDEO_MAX_FRAME; i++)
1286                 if (q->bufs[i] && q->bufs[i]->map)
1287                         return -EBUSY;
1288         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1289                 if (NULL == q->bufs[i])
1290                         continue;
1291                 q->ops->buf_release(q,q->bufs[i]);
1292                 kfree(q->bufs[i]);
1293                 q->bufs[i] = NULL;
1294         }
1295         return 0;
1296 }
1297
1298 int videobuf_mmap_mapper(struct videobuf_queue *q,
1299                          struct vm_area_struct *vma)
1300 {
1301         struct videobuf_mapping *map;
1302         unsigned int first,last,size,i;
1303         int retval;
1304
1305         mutex_lock(&q->lock);
1306         retval = -EINVAL;
1307         if (!(vma->vm_flags & VM_WRITE)) {
1308                 dprintk(1,"mmap app bug: PROT_WRITE please\n");
1309                 goto done;
1310         }
1311         if (!(vma->vm_flags & VM_SHARED)) {
1312                 dprintk(1,"mmap app bug: MAP_SHARED please\n");
1313                 goto done;
1314         }
1315
1316         /* look for first buffer to map */
1317         for (first = 0; first < VIDEO_MAX_FRAME; first++) {
1318                 if (NULL == q->bufs[first])
1319                         continue;
1320                 if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
1321                         continue;
1322                 if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
1323                         break;
1324         }
1325         if (VIDEO_MAX_FRAME == first) {
1326                 dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
1327                         (vma->vm_pgoff << PAGE_SHIFT));
1328                 goto done;
1329         }
1330
1331         /* look for last buffer to map */
1332         for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
1333                 if (NULL == q->bufs[last])
1334                         continue;
1335                 if (V4L2_MEMORY_MMAP != q->bufs[last]->memory)
1336                         continue;
1337                 if (q->bufs[last]->map) {
1338                         retval = -EBUSY;
1339                         goto done;
1340                 }
1341                 size += q->bufs[last]->bsize;
1342                 if (size == (vma->vm_end - vma->vm_start))
1343                         break;
1344         }
1345         if (VIDEO_MAX_FRAME == last) {
1346                 dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n",
1347                         (vma->vm_end - vma->vm_start));
1348                 goto done;
1349         }
1350
1351         /* create mapping + update buffer list */
1352         retval = -ENOMEM;
1353         map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
1354         if (NULL == map)
1355                 goto done;
1356         for (size = 0, i = first; i <= last; size += q->bufs[i++]->bsize) {
1357                 q->bufs[i]->map   = map;
1358                 q->bufs[i]->baddr = vma->vm_start + size;
1359         }
1360         map->count    = 1;
1361         map->start    = vma->vm_start;
1362         map->end      = vma->vm_end;
1363         map->q        = q;
1364         vma->vm_ops   = &videobuf_vm_ops;
1365         vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
1366         vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
1367         vma->vm_private_data = map;
1368         dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n",
1369                 map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
1370         retval = 0;
1371
1372  done:
1373         mutex_unlock(&q->lock);
1374         return retval;
1375 }
1376
1377 /* --------------------------------------------------------------------- */
1378
1379 EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
1380
1381 EXPORT_SYMBOL_GPL(videobuf_dma_init);
1382 EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
1383 EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
1384 EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
1385 EXPORT_SYMBOL_GPL(videobuf_dma_map);
1386 EXPORT_SYMBOL_GPL(videobuf_dma_sync);
1387 EXPORT_SYMBOL_GPL(videobuf_dma_unmap);
1388 EXPORT_SYMBOL_GPL(videobuf_dma_free);
1389
1390 EXPORT_SYMBOL_GPL(videobuf_pci_dma_map);
1391 EXPORT_SYMBOL_GPL(videobuf_pci_dma_unmap);
1392
1393 EXPORT_SYMBOL_GPL(videobuf_alloc);
1394 EXPORT_SYMBOL_GPL(videobuf_waiton);
1395 EXPORT_SYMBOL_GPL(videobuf_iolock);
1396
1397 EXPORT_SYMBOL_GPL(videobuf_queue_init);
1398 EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
1399 EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
1400
1401 EXPORT_SYMBOL_GPL(videobuf_next_field);
1402 EXPORT_SYMBOL_GPL(videobuf_status);
1403 EXPORT_SYMBOL_GPL(videobuf_reqbufs);
1404 EXPORT_SYMBOL_GPL(videobuf_querybuf);
1405 EXPORT_SYMBOL_GPL(videobuf_qbuf);
1406 EXPORT_SYMBOL_GPL(videobuf_dqbuf);
1407 EXPORT_SYMBOL_GPL(videobuf_streamon);
1408 EXPORT_SYMBOL_GPL(videobuf_streamoff);
1409
1410 EXPORT_SYMBOL_GPL(videobuf_read_start);
1411 EXPORT_SYMBOL_GPL(videobuf_read_stop);
1412 EXPORT_SYMBOL_GPL(videobuf_read_stream);
1413 EXPORT_SYMBOL_GPL(videobuf_read_one);
1414 EXPORT_SYMBOL_GPL(videobuf_poll_stream);
1415
1416 EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
1417 EXPORT_SYMBOL_GPL(videobuf_mmap_free);
1418 EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);
1419
1420 /*
1421  * Local variables:
1422  * c-basic-offset: 8
1423  * End:
1424  */