cxusb: treat firmware data as const
[linux-2.6] / drivers / media / video / videobuf-dma-sg.c
1 /*
2  * helper functions for SG DMA video4linux capture buffers
3  *
4  * The functions expect the hardware being able to scatter gatter
5  * (i.e. the buffers are not linear in physical memory, but fragmented
6  * into PAGE_SIZE chunks).  They also assume the driver does not need
7  * to touch the video data.
8  *
9  * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
10  *
11  * Highly based on video-buf written originally by:
12  * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
13  * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org>
14  * (c) 2006 Ted Walther and John Sokol
15  *
16  * This program is free software; you can redistribute it and/or modify
17  * it under the terms of the GNU General Public License as published by
18  * the Free Software Foundation; either version 2
19  */
20
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/moduleparam.h>
24 #include <linux/slab.h>
25 #include <linux/interrupt.h>
26
27 #include <linux/dma-mapping.h>
28 #include <linux/vmalloc.h>
29 #include <linux/pagemap.h>
30 #include <linux/scatterlist.h>
31 #include <asm/page.h>
32 #include <asm/pgtable.h>
33
34 #include <media/videobuf-dma-sg.h>
35
36 #define MAGIC_DMABUF 0x19721112
37 #define MAGIC_SG_MEM 0x17890714
38
39 #define MAGIC_CHECK(is,should)  if (unlikely((is) != (should))) \
40         { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }
41
42 static int debug;
43 module_param(debug, int, 0644);
44
45 MODULE_DESCRIPTION("helper module to manage video4linux dma sg buffers");
46 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
47 MODULE_LICENSE("GPL");
48
49 #define dprintk(level, fmt, arg...)     if (debug >= level) \
50         printk(KERN_DEBUG "vbuf-sg: " fmt , ## arg)
51
52 /* --------------------------------------------------------------------- */
53
54 struct scatterlist*
55 videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages)
56 {
57         struct scatterlist *sglist;
58         struct page *pg;
59         int i;
60
61         sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
62         if (NULL == sglist)
63                 return NULL;
64         sg_init_table(sglist, nr_pages);
65         for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
66                 pg = vmalloc_to_page(virt);
67                 if (NULL == pg)
68                         goto err;
69                 BUG_ON(PageHighMem(pg));
70                 sg_set_page(&sglist[i], pg, PAGE_SIZE, 0);
71         }
72         return sglist;
73
74  err:
75         kfree(sglist);
76         return NULL;
77 }
78
79 struct scatterlist*
80 videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset)
81 {
82         struct scatterlist *sglist;
83         int i = 0;
84
85         if (NULL == pages[0])
86                 return NULL;
87         sglist = kcalloc(nr_pages, sizeof(*sglist), GFP_KERNEL);
88         if (NULL == sglist)
89                 return NULL;
90         sg_init_table(sglist, nr_pages);
91
92         if (NULL == pages[0])
93                 goto nopage;
94         if (PageHighMem(pages[0]))
95                 /* DMA to highmem pages might not work */
96                 goto highmem;
97         sg_set_page(&sglist[0], pages[0], PAGE_SIZE - offset, 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                 sg_set_page(&sglist[i], pages[i], PAGE_SIZE, 0);
104         }
105         return sglist;
106
107  nopage:
108         dprintk(2,"sgl: oops - no page\n");
109         kfree(sglist);
110         return NULL;
111
112  highmem:
113         dprintk(2,"sgl: oops - highmem page\n");
114         kfree(sglist);
115         return NULL;
116 }
117
118 /* --------------------------------------------------------------------- */
119
120 struct videobuf_dmabuf *videobuf_to_dma (struct videobuf_buffer *buf)
121 {
122         struct videobuf_dma_sg_memory *mem = buf->priv;
123         BUG_ON(!mem);
124
125         MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
126
127         return &mem->dma;
128 }
129
130 void videobuf_dma_init(struct videobuf_dmabuf *dma)
131 {
132         memset(dma,0,sizeof(*dma));
133         dma->magic = MAGIC_DMABUF;
134 }
135
136 static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma,
137                         int direction, unsigned long data, unsigned long size)
138 {
139         unsigned long first,last;
140         int err, rw = 0;
141
142         dma->direction = direction;
143         switch (dma->direction) {
144         case DMA_FROM_DEVICE:
145                 rw = READ;
146                 break;
147         case DMA_TO_DEVICE:
148                 rw = WRITE;
149                 break;
150         default:
151                 BUG();
152         }
153
154         first = (data          & PAGE_MASK) >> PAGE_SHIFT;
155         last  = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
156         dma->offset   = data & ~PAGE_MASK;
157         dma->nr_pages = last-first+1;
158         dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*),
159                              GFP_KERNEL);
160         if (NULL == dma->pages)
161                 return -ENOMEM;
162         dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n",
163                 data,size,dma->nr_pages);
164
165         err = get_user_pages(current,current->mm,
166                              data & PAGE_MASK, dma->nr_pages,
167                              rw == READ, 1, /* force */
168                              dma->pages, NULL);
169
170         if (err != dma->nr_pages) {
171                 dma->nr_pages = (err >= 0) ? err : 0;
172                 dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages);
173                 return err < 0 ? err : -EINVAL;
174         }
175         return 0;
176 }
177
178 int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
179                            unsigned long data, unsigned long size)
180 {
181         int ret;
182         down_read(&current->mm->mmap_sem);
183         ret = videobuf_dma_init_user_locked(dma, direction, data, size);
184         up_read(&current->mm->mmap_sem);
185
186         return ret;
187 }
188
189 int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
190                              int nr_pages)
191 {
192         dprintk(1,"init kernel [%d pages]\n",nr_pages);
193         dma->direction = direction;
194         dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT);
195         if (NULL == dma->vmalloc) {
196                 dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages);
197                 return -ENOMEM;
198         }
199         dprintk(1,"vmalloc is at addr 0x%08lx, size=%d\n",
200                                 (unsigned long)dma->vmalloc,
201                                 nr_pages << PAGE_SHIFT);
202         memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT);
203         dma->nr_pages = nr_pages;
204         return 0;
205 }
206
207 int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
208                               dma_addr_t addr, int nr_pages)
209 {
210         dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n",
211                 nr_pages,(unsigned long)addr);
212         dma->direction = direction;
213         if (0 == addr)
214                 return -EINVAL;
215
216         dma->bus_addr = addr;
217         dma->nr_pages = nr_pages;
218         return 0;
219 }
220
221 int videobuf_dma_map(struct videobuf_queue* q, struct videobuf_dmabuf *dma)
222 {
223         MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
224         BUG_ON(0 == dma->nr_pages);
225
226         if (dma->pages) {
227                 dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
228                                                    dma->offset);
229         }
230         if (dma->vmalloc) {
231                 dma->sglist = videobuf_vmalloc_to_sg
232                                                 (dma->vmalloc,dma->nr_pages);
233         }
234         if (dma->bus_addr) {
235                 dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL);
236                 if (NULL != dma->sglist) {
237                         dma->sglen  = 1;
238                         sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK;
239                         dma->sglist[0].offset           = dma->bus_addr & ~PAGE_MASK;
240                         sg_dma_len(&dma->sglist[0])     = dma->nr_pages * PAGE_SIZE;
241                 }
242         }
243         if (NULL == dma->sglist) {
244                 dprintk(1,"scatterlist is NULL\n");
245                 return -ENOMEM;
246         }
247         if (!dma->bus_addr) {
248                 dma->sglen = dma_map_sg(q->dev, dma->sglist,
249                                         dma->nr_pages, dma->direction);
250                 if (0 == dma->sglen) {
251                         printk(KERN_WARNING
252                                "%s: videobuf_map_sg failed\n",__func__);
253                         kfree(dma->sglist);
254                         dma->sglist = NULL;
255                         dma->sglen = 0;
256                         return -EIO;
257                 }
258         }
259         return 0;
260 }
261
262 int videobuf_dma_sync(struct videobuf_queue *q, struct videobuf_dmabuf *dma)
263 {
264         MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
265         BUG_ON(!dma->sglen);
266
267         dma_sync_sg_for_cpu(q->dev, dma->sglist, dma->nr_pages, dma->direction);
268         return 0;
269 }
270
271 int videobuf_dma_unmap(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
272 {
273         MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
274         if (!dma->sglen)
275                 return 0;
276
277         dma_unmap_sg(q->dev, dma->sglist, dma->nr_pages, dma->direction);
278
279         kfree(dma->sglist);
280         dma->sglist = NULL;
281         dma->sglen = 0;
282         return 0;
283 }
284
285 int videobuf_dma_free(struct videobuf_dmabuf *dma)
286 {
287         MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
288         BUG_ON(dma->sglen);
289
290         if (dma->pages) {
291                 int i;
292                 for (i=0; i < dma->nr_pages; i++)
293                         page_cache_release(dma->pages[i]);
294                 kfree(dma->pages);
295                 dma->pages = NULL;
296         }
297
298         vfree(dma->vmalloc);
299         dma->vmalloc = NULL;
300
301         if (dma->bus_addr) {
302                 dma->bus_addr = 0;
303         }
304         dma->direction = DMA_NONE;
305         return 0;
306 }
307
308 /* --------------------------------------------------------------------- */
309
310 int videobuf_sg_dma_map(struct device *dev, struct videobuf_dmabuf *dma)
311 {
312         struct videobuf_queue q;
313
314         q.dev = dev;
315
316         return videobuf_dma_map(&q, dma);
317 }
318
319 int videobuf_sg_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma)
320 {
321         struct videobuf_queue q;
322
323         q.dev = dev;
324
325         return videobuf_dma_unmap(&q, dma);
326 }
327
328 /* --------------------------------------------------------------------- */
329
330 static void
331 videobuf_vm_open(struct vm_area_struct *vma)
332 {
333         struct videobuf_mapping *map = vma->vm_private_data;
334
335         dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
336                 map->count,vma->vm_start,vma->vm_end);
337         map->count++;
338 }
339
340 static void
341 videobuf_vm_close(struct vm_area_struct *vma)
342 {
343         struct videobuf_mapping *map = vma->vm_private_data;
344         struct videobuf_queue *q = map->q;
345         struct videobuf_dma_sg_memory *mem;
346         int i;
347
348         dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
349                 map->count,vma->vm_start,vma->vm_end);
350
351         map->count--;
352         if (0 == map->count) {
353                 dprintk(1,"munmap %p q=%p\n",map,q);
354                 mutex_lock(&q->vb_lock);
355                 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
356                         if (NULL == q->bufs[i])
357                                 continue;
358                         mem=q->bufs[i]->priv;
359
360                         if (!mem)
361                                 continue;
362
363                         MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
364
365                         if (q->bufs[i]->map != map)
366                                 continue;
367                         q->bufs[i]->map   = NULL;
368                         q->bufs[i]->baddr = 0;
369                         q->ops->buf_release(q,q->bufs[i]);
370                 }
371                 mutex_unlock(&q->vb_lock);
372                 kfree(map);
373         }
374         return;
375 }
376
377 /*
378  * Get a anonymous page for the mapping.  Make sure we can DMA to that
379  * memory location with 32bit PCI devices (i.e. don't use highmem for
380  * now ...).  Bounce buffers don't work very well for the data rates
381  * video capture has.
382  */
383 static int
384 videobuf_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
385 {
386         struct page *page;
387
388         dprintk(3,"fault: fault @ %08lx [vma %08lx-%08lx]\n",
389                 (unsigned long)vmf->virtual_address,vma->vm_start,vma->vm_end);
390         page = alloc_page(GFP_USER | __GFP_DMA32);
391         if (!page)
392                 return VM_FAULT_OOM;
393         clear_user_page(page_address(page), (unsigned long)vmf->virtual_address,
394                         page);
395         vmf->page = page;
396         return 0;
397 }
398
399 static struct vm_operations_struct videobuf_vm_ops =
400 {
401         .open     = videobuf_vm_open,
402         .close    = videobuf_vm_close,
403         .fault    = videobuf_vm_fault,
404 };
405
406 /* ---------------------------------------------------------------------
407  * SG handlers for the generic methods
408  */
409
410 /* Allocated area consists on 3 parts:
411         struct video_buffer
412         struct <driver>_buffer (cx88_buffer, saa7134_buf, ...)
413         struct videobuf_dma_sg_memory
414  */
415
416 static void *__videobuf_alloc(size_t size)
417 {
418         struct videobuf_dma_sg_memory *mem;
419         struct videobuf_buffer *vb;
420
421         vb = kzalloc(size+sizeof(*mem),GFP_KERNEL);
422
423         mem = vb->priv = ((char *)vb)+size;
424         mem->magic=MAGIC_SG_MEM;
425
426         videobuf_dma_init(&mem->dma);
427
428         dprintk(1,"%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
429                 __func__,vb,(long)sizeof(*vb),(long)size-sizeof(*vb),
430                 mem,(long)sizeof(*mem));
431
432         return vb;
433 }
434
435 static void *__videobuf_to_vmalloc (struct videobuf_buffer *buf)
436 {
437         struct videobuf_dma_sg_memory *mem = buf->priv;
438         BUG_ON(!mem);
439
440         MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
441
442         return mem->dma.vmalloc;
443 }
444
445 static int __videobuf_iolock (struct videobuf_queue* q,
446                               struct videobuf_buffer *vb,
447                               struct v4l2_framebuffer *fbuf)
448 {
449         int err,pages;
450         dma_addr_t bus;
451         struct videobuf_dma_sg_memory *mem = vb->priv;
452         BUG_ON(!mem);
453
454         MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
455
456         switch (vb->memory) {
457         case V4L2_MEMORY_MMAP:
458         case V4L2_MEMORY_USERPTR:
459                 if (0 == vb->baddr) {
460                         /* no userspace addr -- kernel bounce buffer */
461                         pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
462                         err = videobuf_dma_init_kernel( &mem->dma,
463                                                         DMA_FROM_DEVICE,
464                                                         pages );
465                         if (0 != err)
466                                 return err;
467                 } else if (vb->memory == V4L2_MEMORY_USERPTR) {
468                         /* dma directly to userspace */
469                         err = videobuf_dma_init_user( &mem->dma,
470                                                       DMA_FROM_DEVICE,
471                                                       vb->baddr,vb->bsize );
472                         if (0 != err)
473                                 return err;
474                 } else {
475                         /* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP
476                         buffers can only be called from videobuf_qbuf
477                         we take current->mm->mmap_sem there, to prevent
478                         locking inversion, so don't take it here */
479
480                         err = videobuf_dma_init_user_locked(&mem->dma,
481                                                       DMA_FROM_DEVICE,
482                                                       vb->baddr, vb->bsize);
483                         if (0 != err)
484                                 return err;
485                 }
486                 break;
487         case V4L2_MEMORY_OVERLAY:
488                 if (NULL == fbuf)
489                         return -EINVAL;
490                 /* FIXME: need sanity checks for vb->boff */
491                 /*
492                  * Using a double cast to avoid compiler warnings when
493                  * building for PAE. Compiler doesn't like direct casting
494                  * of a 32 bit ptr to 64 bit integer.
495                  */
496                 bus   = (dma_addr_t)(unsigned long)fbuf->base + vb->boff;
497                 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
498                 err = videobuf_dma_init_overlay(&mem->dma, DMA_FROM_DEVICE,
499                                                 bus, pages);
500                 if (0 != err)
501                         return err;
502                 break;
503         default:
504                 BUG();
505         }
506         err = videobuf_dma_map(q, &mem->dma);
507         if (0 != err)
508                 return err;
509
510         return 0;
511 }
512
513 static int __videobuf_sync(struct videobuf_queue *q,
514                            struct videobuf_buffer *buf)
515 {
516         struct videobuf_dma_sg_memory *mem = buf->priv;
517         BUG_ON(!mem);
518         MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
519
520         return  videobuf_dma_sync(q,&mem->dma);
521 }
522
523 static int __videobuf_mmap_free(struct videobuf_queue *q)
524 {
525         int i;
526
527         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
528                 if (q->bufs[i]) {
529                         if (q->bufs[i]->map)
530                                 return -EBUSY;
531                 }
532         }
533
534         return 0;
535 }
536
537 static int __videobuf_mmap_mapper(struct videobuf_queue *q,
538                          struct vm_area_struct *vma)
539 {
540         struct videobuf_dma_sg_memory *mem;
541         struct videobuf_mapping *map;
542         unsigned int first,last,size,i;
543         int retval;
544
545         retval = -EINVAL;
546         if (!(vma->vm_flags & VM_WRITE)) {
547                 dprintk(1,"mmap app bug: PROT_WRITE please\n");
548                 goto done;
549         }
550         if (!(vma->vm_flags & VM_SHARED)) {
551                 dprintk(1,"mmap app bug: MAP_SHARED please\n");
552                 goto done;
553         }
554
555         /* This function maintains backwards compatibility with V4L1 and will
556          * map more than one buffer if the vma length is equal to the combined
557          * size of multiple buffers than it will map them together.  See
558          * VIDIOCGMBUF in the v4l spec
559          *
560          * TODO: Allow drivers to specify if they support this mode
561          */
562
563         /* look for first buffer to map */
564         for (first = 0; first < VIDEO_MAX_FRAME; first++) {
565                 if (NULL == q->bufs[first])
566                         continue;
567                 mem=q->bufs[first]->priv;
568                 BUG_ON(!mem);
569                 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
570
571                 if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
572                         continue;
573                 if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
574                         break;
575         }
576         if (VIDEO_MAX_FRAME == first) {
577                 dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
578                         (vma->vm_pgoff << PAGE_SHIFT));
579                 goto done;
580         }
581
582         /* look for last buffer to map */
583         for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
584                 if (NULL == q->bufs[last])
585                         continue;
586                 if (V4L2_MEMORY_MMAP != q->bufs[last]->memory)
587                         continue;
588                 if (q->bufs[last]->map) {
589                         retval = -EBUSY;
590                         goto done;
591                 }
592                 size += q->bufs[last]->bsize;
593                 if (size == (vma->vm_end - vma->vm_start))
594                         break;
595         }
596         if (VIDEO_MAX_FRAME == last) {
597                 dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n",
598                         (vma->vm_end - vma->vm_start));
599                 goto done;
600         }
601
602         /* create mapping + update buffer list */
603         retval = -ENOMEM;
604         map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
605         if (NULL == map)
606                 goto done;
607
608         size = 0;
609         for (i = first; i <= last; i++) {
610                 if (NULL == q->bufs[i])
611                         continue;
612                 q->bufs[i]->map   = map;
613                 q->bufs[i]->baddr = vma->vm_start + size;
614                 size += q->bufs[i]->bsize;
615         }
616
617         map->count    = 1;
618         map->start    = vma->vm_start;
619         map->end      = vma->vm_end;
620         map->q        = q;
621         vma->vm_ops   = &videobuf_vm_ops;
622         vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
623         vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
624         vma->vm_private_data = map;
625         dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n",
626                 map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
627         retval = 0;
628
629  done:
630         return retval;
631 }
632
633 static int __videobuf_copy_to_user ( struct videobuf_queue *q,
634                                 char __user *data, size_t count,
635                                 int nonblocking )
636 {
637         struct videobuf_dma_sg_memory *mem = q->read_buf->priv;
638         BUG_ON(!mem);
639         MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
640
641         /* copy to userspace */
642         if (count > q->read_buf->size - q->read_off)
643                 count = q->read_buf->size - q->read_off;
644
645         if (copy_to_user(data, mem->dma.vmalloc+q->read_off, count))
646                 return -EFAULT;
647
648         return count;
649 }
650
651 static int __videobuf_copy_stream ( struct videobuf_queue *q,
652                                 char __user *data, size_t count, size_t pos,
653                                 int vbihack, int nonblocking )
654 {
655         unsigned int  *fc;
656         struct videobuf_dma_sg_memory *mem = q->read_buf->priv;
657         BUG_ON(!mem);
658         MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
659
660         if (vbihack) {
661                 /* dirty, undocumented hack -- pass the frame counter
662                         * within the last four bytes of each vbi data block.
663                         * We need that one to maintain backward compatibility
664                         * to all vbi decoding software out there ... */
665                 fc  = (unsigned int*)mem->dma.vmalloc;
666                 fc += (q->read_buf->size>>2) -1;
667                 *fc = q->read_buf->field_count >> 1;
668                 dprintk(1,"vbihack: %d\n",*fc);
669         }
670
671         /* copy stuff using the common method */
672         count = __videobuf_copy_to_user (q,data,count,nonblocking);
673
674         if ( (count==-EFAULT) && (0 == pos) )
675                 return -EFAULT;
676
677         return count;
678 }
679
680 static struct videobuf_qtype_ops sg_ops = {
681         .magic        = MAGIC_QTYPE_OPS,
682
683         .alloc        = __videobuf_alloc,
684         .iolock       = __videobuf_iolock,
685         .sync         = __videobuf_sync,
686         .mmap_free    = __videobuf_mmap_free,
687         .mmap_mapper  = __videobuf_mmap_mapper,
688         .video_copy_to_user = __videobuf_copy_to_user,
689         .copy_stream  = __videobuf_copy_stream,
690         .vmalloc      = __videobuf_to_vmalloc,
691 };
692
693 void *videobuf_sg_alloc(size_t size)
694 {
695         struct videobuf_queue q;
696
697         /* Required to make generic handler to call __videobuf_alloc */
698         q.int_ops = &sg_ops;
699
700         q.msize = size;
701
702         return videobuf_alloc(&q);
703 }
704
705 void videobuf_queue_sg_init(struct videobuf_queue* q,
706                          struct videobuf_queue_ops *ops,
707                          struct device *dev,
708                          spinlock_t *irqlock,
709                          enum v4l2_buf_type type,
710                          enum v4l2_field field,
711                          unsigned int msize,
712                          void *priv)
713 {
714         videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize,
715                                  priv, &sg_ops);
716 }
717
718 /* --------------------------------------------------------------------- */
719
720 EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
721
722 EXPORT_SYMBOL_GPL(videobuf_to_dma);
723 EXPORT_SYMBOL_GPL(videobuf_dma_init);
724 EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
725 EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
726 EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
727 EXPORT_SYMBOL_GPL(videobuf_dma_map);
728 EXPORT_SYMBOL_GPL(videobuf_dma_sync);
729 EXPORT_SYMBOL_GPL(videobuf_dma_unmap);
730 EXPORT_SYMBOL_GPL(videobuf_dma_free);
731
732 EXPORT_SYMBOL_GPL(videobuf_sg_dma_map);
733 EXPORT_SYMBOL_GPL(videobuf_sg_dma_unmap);
734 EXPORT_SYMBOL_GPL(videobuf_sg_alloc);
735
736 EXPORT_SYMBOL_GPL(videobuf_queue_sg_init);
737
738 /*
739  * Local variables:
740  * c-basic-offset: 8
741  * End:
742  */