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added 2.6.29.6 aldebaran kernel
[nao-ulib.git] / kernel / 2.6.29.6-aldebaran-rt / drivers / media / video / videobuf-dma-sg.c
blobda1790e57a86c87b03c530deb58435cab036b80d
1 /*
2 * helper functions for SG DMA video4linux capture buffers
3 *
4 * The functions expect the hardware being able to scatter gather
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;
84
85 if (NULL == pages[0])
86 return NULL;
87 sglist = kmalloc(nr_pages * sizeof(*sglist), GFP_KERNEL);
88 if (NULL == sglist)
89 return NULL;
90 sg_init_table(sglist, nr_pages);
91
92 if (PageHighMem(pages[0]))
93 /* DMA to highmem pages might not work */
94 goto highmem;
95 sg_set_page(&sglist[0], pages[0], PAGE_SIZE - offset, offset);
96 for (i = 1; i < nr_pages; i++) {
97 if (NULL == pages[i])
98 goto nopage;
99 if (PageHighMem(pages[i]))
100 goto highmem;
101 sg_set_page(&sglist[i], pages[i], PAGE_SIZE, 0);
102 }
103 return sglist;
104
105 nopage:
106 dprintk(2,"sgl: oops - no page\n");
107 kfree(sglist);
108 return NULL;
109
110 highmem:
111 dprintk(2,"sgl: oops - highmem page\n");
112 kfree(sglist);
113 return NULL;
114 }
115
116 /* --------------------------------------------------------------------- */
117
118 struct videobuf_dmabuf *videobuf_to_dma (struct videobuf_buffer *buf)
119 {
120 struct videobuf_dma_sg_memory *mem = buf->priv;
121 BUG_ON(!mem);
122
123 MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
124
125 return &mem->dma;
126 }
127
128 void videobuf_dma_init(struct videobuf_dmabuf *dma)
129 {
130 memset(dma,0,sizeof(*dma));
131 dma->magic = MAGIC_DMABUF;
132 }
133
134 static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma,
135 int direction, unsigned long data, unsigned long size)
136 {
137 unsigned long first,last;
138 int err, rw = 0;
139
140 dma->direction = direction;
141 switch (dma->direction) {
142 case DMA_FROM_DEVICE:
143 rw = READ;
144 break;
145 case DMA_TO_DEVICE:
146 rw = WRITE;
147 break;
148 default:
149 BUG();
150 }
151
152 first = (data & PAGE_MASK) >> PAGE_SHIFT;
153 last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
154 dma->offset = data & ~PAGE_MASK;
155 dma->nr_pages = last-first+1;
156 dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*),
157 GFP_KERNEL);
158 if (NULL == dma->pages)
159 return -ENOMEM;
160 dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n",
161 data,size,dma->nr_pages);
162
163 err = get_user_pages(current,current->mm,
164 data & PAGE_MASK, dma->nr_pages,
165 rw == READ, 1, /* force */
166 dma->pages, NULL);
167
168 if (err != dma->nr_pages) {
169 dma->nr_pages = (err >= 0) ? err : 0;
170 dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages);
171 return err < 0 ? err : -EINVAL;
172 }
173 return 0;
174 }
175
176 int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
177 unsigned long data, unsigned long size)
178 {
179 int ret;
180 down_read(&current->mm->mmap_sem);
181 ret = videobuf_dma_init_user_locked(dma, direction, data, size);
182 up_read(&current->mm->mmap_sem);
183
184 return ret;
185 }
186
187 int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
188 int nr_pages)
189 {
190 dprintk(1,"init kernel [%d pages]\n",nr_pages);
191 dma->direction = direction;
192 dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT);
193 if (NULL == dma->vmalloc) {
194 dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages);
195 return -ENOMEM;
196 }
197 dprintk(1,"vmalloc is at addr 0x%08lx, size=%d\n",
198 (unsigned long)dma->vmalloc,
199 nr_pages << PAGE_SHIFT);
200 memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT);
201 dma->nr_pages = nr_pages;
202 return 0;
203 }
204
205 int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
206 dma_addr_t addr, int nr_pages)
207 {
208 dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n",
209 nr_pages,(unsigned long)addr);
210 dma->direction = direction;
211 if (0 == addr)
212 return -EINVAL;
213
214 dma->bus_addr = addr;
215 dma->nr_pages = nr_pages;
216 return 0;
217 }
218
219 int videobuf_dma_map(struct videobuf_queue* q, struct videobuf_dmabuf *dma)
220 {
221 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
222 BUG_ON(0 == dma->nr_pages);
223
224 if (dma->pages) {
225 dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
226 dma->offset);
227 }
228 if (dma->vmalloc) {
229 dma->sglist = videobuf_vmalloc_to_sg
230 (dma->vmalloc,dma->nr_pages);
231 }
232 if (dma->bus_addr) {
233 dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL);
234 if (NULL != dma->sglist) {
235 dma->sglen = 1;
236 sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK;
237 dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK;
238 sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE;
239 }
240 }
241 if (NULL == dma->sglist) {
242 dprintk(1,"scatterlist is NULL\n");
243 return -ENOMEM;
244 }
245 if (!dma->bus_addr) {
246 dma->sglen = dma_map_sg(q->dev, dma->sglist,
247 dma->nr_pages, dma->direction);
248 if (0 == dma->sglen) {
249 printk(KERN_WARNING
250 "%s: videobuf_map_sg failed\n",__func__);
251 kfree(dma->sglist);
252 dma->sglist = NULL;
253 dma->sglen = 0;
254 return -EIO;
255 }
256 }
257 return 0;
258 }
259
260 int videobuf_dma_sync(struct videobuf_queue *q, struct videobuf_dmabuf *dma)
261 {
262 MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
263 BUG_ON(!dma->sglen);
264
265 dma_sync_sg_for_cpu(q->dev, dma->sglist, dma->nr_pages, dma->direction);
266 return 0;
267 }
268
269 int videobuf_dma_unmap(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
270 {
271 MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
272 if (!dma->sglen)
273 return 0;
274
275 dma_unmap_sg(q->dev, dma->sglist, dma->nr_pages, dma->direction);
276
277 kfree(dma->sglist);
278 dma->sglist = NULL;
279 dma->sglen = 0;
280 return 0;
281 }
282
283 int videobuf_dma_free(struct videobuf_dmabuf *dma)
284 {
285 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
286 BUG_ON(dma->sglen);
287
288 if (dma->pages) {
289 int i;
290 for (i=0; i < dma->nr_pages; i++)
291 page_cache_release(dma->pages[i]);
292 kfree(dma->pages);
293 dma->pages = NULL;
294 }
295
296 vfree(dma->vmalloc);
297 dma->vmalloc = NULL;
298
299 if (dma->bus_addr) {
300 dma->bus_addr = 0;
301 }
302 dma->direction = DMA_NONE;
303 return 0;
304 }
305
306 /* --------------------------------------------------------------------- */
307
308 int videobuf_sg_dma_map(struct device *dev, struct videobuf_dmabuf *dma)
309 {
310 struct videobuf_queue q;
311
312 q.dev = dev;
313
314 return videobuf_dma_map(&q, dma);
315 }
316
317 int videobuf_sg_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma)
318 {
319 struct videobuf_queue q;
320
321 q.dev = dev;
322
323 return videobuf_dma_unmap(&q, dma);
324 }
325
326 /* --------------------------------------------------------------------- */
327
328 static void
329 videobuf_vm_open(struct vm_area_struct *vma)
330 {
331 struct videobuf_mapping *map = vma->vm_private_data;
332
333 dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
334 map->count,vma->vm_start,vma->vm_end);
335 map->count++;
336 }
337
338 static void
339 videobuf_vm_close(struct vm_area_struct *vma)
340 {
341 struct videobuf_mapping *map = vma->vm_private_data;
342 struct videobuf_queue *q = map->q;
343 struct videobuf_dma_sg_memory *mem;
344 int i;
345
346 dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
347 map->count,vma->vm_start,vma->vm_end);
348
349 map->count--;
350 if (0 == map->count) {
351 dprintk(1,"munmap %p q=%p\n",map,q);
352 mutex_lock(&q->vb_lock);
353 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
354 if (NULL == q->bufs[i])
355 continue;
356 mem=q->bufs[i]->priv;
357
358 if (!mem)
359 continue;
360
361 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
362
363 if (q->bufs[i]->map != map)
364 continue;
365 q->bufs[i]->map = NULL;
366 q->bufs[i]->baddr = 0;
367 q->ops->buf_release(q,q->bufs[i]);
368 }
369 mutex_unlock(&q->vb_lock);
370 kfree(map);
371 }
372 return;
373 }
374
375 /*
376 * Get a anonymous page for the mapping. Make sure we can DMA to that
377 * memory location with 32bit PCI devices (i.e. don't use highmem for
378 * now ...). Bounce buffers don't work very well for the data rates
379 * video capture has.
380 */
381 static int
382 videobuf_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
383 {
384 struct page *page;
385
386 dprintk(3,"fault: fault @ %08lx [vma %08lx-%08lx]\n",
387 (unsigned long)vmf->virtual_address,vma->vm_start,vma->vm_end);
388 page = alloc_page(GFP_USER | __GFP_DMA32);
389 if (!page)
390 return VM_FAULT_OOM;
391 clear_user_highpage(page, (unsigned long)vmf->virtual_address);
392 vmf->page = page;
393 return 0;
394 }
395
396 static struct vm_operations_struct videobuf_vm_ops =
397 {
398 .open = videobuf_vm_open,
399 .close = videobuf_vm_close,
400 .fault = videobuf_vm_fault,
401 };
402
403 /* ---------------------------------------------------------------------
404 * SG handlers for the generic methods
405 */
406
407 /* Allocated area consists on 3 parts:
408 struct video_buffer
409 struct <driver>_buffer (cx88_buffer, saa7134_buf, ...)
410 struct videobuf_dma_sg_memory
411 */
412
413 static void *__videobuf_alloc(size_t size)
414 {
415 struct videobuf_dma_sg_memory *mem;
416 struct videobuf_buffer *vb;
417
418 vb = kzalloc(size+sizeof(*mem),GFP_KERNEL);
419
420 mem = vb->priv = ((char *)vb)+size;
421 mem->magic=MAGIC_SG_MEM;
422
423 videobuf_dma_init(&mem->dma);
424
425 dprintk(1,"%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
426 __func__,vb,(long)sizeof(*vb),(long)size-sizeof(*vb),
427 mem,(long)sizeof(*mem));
428
429 return vb;
430 }
431
432 static void *__videobuf_to_vmalloc (struct videobuf_buffer *buf)
433 {
434 struct videobuf_dma_sg_memory *mem = buf->priv;
435 BUG_ON(!mem);
436
437 MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
438
439 return mem->dma.vmalloc;
440 }
441
442 static int __videobuf_iolock (struct videobuf_queue* q,
443 struct videobuf_buffer *vb,
444 struct v4l2_framebuffer *fbuf)
445 {
446 int err,pages;
447 dma_addr_t bus;
448 struct videobuf_dma_sg_memory *mem = vb->priv;
449 BUG_ON(!mem);
450
451 MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
452
453 switch (vb->memory) {
454 case V4L2_MEMORY_MMAP:
455 case V4L2_MEMORY_USERPTR:
456 if (0 == vb->baddr) {
457 /* no userspace addr -- kernel bounce buffer */
458 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
459 err = videobuf_dma_init_kernel( &mem->dma,
460 DMA_FROM_DEVICE,
461 pages );
462 if (0 != err)
463 return err;
464 } else if (vb->memory == V4L2_MEMORY_USERPTR) {
465 /* dma directly to userspace */
466 err = videobuf_dma_init_user( &mem->dma,
467 DMA_FROM_DEVICE,
468 vb->baddr,vb->bsize );
469 if (0 != err)
470 return err;
471 } else {
472 /* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP
473 buffers can only be called from videobuf_qbuf
474 we take current->mm->mmap_sem there, to prevent
475 locking inversion, so don't take it here */
476
477 err = videobuf_dma_init_user_locked(&mem->dma,
478 DMA_FROM_DEVICE,
479 vb->baddr, vb->bsize);
480 if (0 != err)
481 return err;
482 }
483 break;
484 case V4L2_MEMORY_OVERLAY:
485 if (NULL == fbuf)
486 return -EINVAL;
487 /* FIXME: need sanity checks for vb->boff */
488 /*
489 * Using a double cast to avoid compiler warnings when
490 * building for PAE. Compiler doesn't like direct casting
491 * of a 32 bit ptr to 64 bit integer.
492 */
493 bus = (dma_addr_t)(unsigned long)fbuf->base + vb->boff;
494 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
495 err = videobuf_dma_init_overlay(&mem->dma, DMA_FROM_DEVICE,
496 bus, pages);
497 if (0 != err)
498 return err;
499 break;
500 default:
501 BUG();
502 }
503 err = videobuf_dma_map(q, &mem->dma);
504 if (0 != err)
505 return err;
506
507 return 0;
508 }
509
510 static int __videobuf_sync(struct videobuf_queue *q,
511 struct videobuf_buffer *buf)
512 {
513 struct videobuf_dma_sg_memory *mem = buf->priv;
514 BUG_ON(!mem);
515 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
516
517 return videobuf_dma_sync(q,&mem->dma);
518 }
519
520 static int __videobuf_mmap_free(struct videobuf_queue *q)
521 {
522 int i;
523
524 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
525 if (q->bufs[i]) {
526 if (q->bufs[i]->map)
527 return -EBUSY;
528 }
529 }
530
531 return 0;
532 }
533
534 static int __videobuf_mmap_mapper(struct videobuf_queue *q,
535 struct vm_area_struct *vma)
536 {
537 struct videobuf_dma_sg_memory *mem;
538 struct videobuf_mapping *map;
539 unsigned int first,last,size,i;
540 int retval;
541
542 retval = -EINVAL;
543 if (!(vma->vm_flags & VM_WRITE)) {
544 dprintk(1,"mmap app bug: PROT_WRITE please\n");
545 goto done;
546 }
547 if (!(vma->vm_flags & VM_SHARED)) {
548 dprintk(1,"mmap app bug: MAP_SHARED please\n");
549 goto done;
550 }
551
552 /* This function maintains backwards compatibility with V4L1 and will
553 * map more than one buffer if the vma length is equal to the combined
554 * size of multiple buffers than it will map them together. See
555 * VIDIOCGMBUF in the v4l spec
556 *
557 * TODO: Allow drivers to specify if they support this mode
558 */
559
560 /* look for first buffer to map */
561 for (first = 0; first < VIDEO_MAX_FRAME; first++) {
562 if (NULL == q->bufs[first])
563 continue;
564 mem=q->bufs[first]->priv;
565 BUG_ON(!mem);
566 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
567
568 if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
569 continue;
570 if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
571 break;
572 }
573 if (VIDEO_MAX_FRAME == first) {
574 dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
575 (vma->vm_pgoff << PAGE_SHIFT));
576 goto done;
577 }
578
579 /* look for last buffer to map */
580 for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
581 if (NULL == q->bufs[last])
582 continue;
583 if (V4L2_MEMORY_MMAP != q->bufs[last]->memory)
584 continue;
585 if (q->bufs[last]->map) {
586 retval = -EBUSY;
587 goto done;
588 }
589 size += q->bufs[last]->bsize;
590 if (size == (vma->vm_end - vma->vm_start))
591 break;
592 }
593 if (VIDEO_MAX_FRAME == last) {
594 dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n",
595 (vma->vm_end - vma->vm_start));
596 goto done;
597 }
598
599 /* create mapping + update buffer list */
600 retval = -ENOMEM;
601 map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
602 if (NULL == map)
603 goto done;
604
605 size = 0;
606 for (i = first; i <= last; i++) {
607 if (NULL == q->bufs[i])
608 continue;
609 q->bufs[i]->map = map;
610 q->bufs[i]->baddr = vma->vm_start + size;
611 size += q->bufs[i]->bsize;
612 }
613
614 map->count = 1;
615 map->start = vma->vm_start;
616 map->end = vma->vm_end;
617 map->q = q;
618 vma->vm_ops = &videobuf_vm_ops;
619 vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
620 vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
621 vma->vm_private_data = map;
622 dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n",
623 map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
624 retval = 0;
625
626 done:
627 return retval;
628 }
629
630 static int __videobuf_copy_to_user ( struct videobuf_queue *q,
631 char __user *data, size_t count,
632 int nonblocking )
633 {
634 struct videobuf_dma_sg_memory *mem = q->read_buf->priv;
635 BUG_ON(!mem);
636 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
637
638 /* copy to userspace */
639 if (count > q->read_buf->size - q->read_off)
640 count = q->read_buf->size - q->read_off;
641
642 if (copy_to_user(data, mem->dma.vmalloc+q->read_off, count))
643 return -EFAULT;
644
645 return count;
646 }
647
648 static int __videobuf_copy_stream ( struct videobuf_queue *q,
649 char __user *data, size_t count, size_t pos,
650 int vbihack, int nonblocking )
651 {
652 unsigned int *fc;
653 struct videobuf_dma_sg_memory *mem = q->read_buf->priv;
654 BUG_ON(!mem);
655 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
656
657 if (vbihack) {
658 /* dirty, undocumented hack -- pass the frame counter
659 * within the last four bytes of each vbi data block.
660 * We need that one to maintain backward compatibility
661 * to all vbi decoding software out there ... */
662 fc = (unsigned int*)mem->dma.vmalloc;
663 fc += (q->read_buf->size>>2) -1;
664 *fc = q->read_buf->field_count >> 1;
665 dprintk(1,"vbihack: %d\n",*fc);
666 }
667
668 /* copy stuff using the common method */
669 count = __videobuf_copy_to_user (q,data,count,nonblocking);
670
671 if ( (count==-EFAULT) && (0 == pos) )
672 return -EFAULT;
673
674 return count;
675 }
676
677 static struct videobuf_qtype_ops sg_ops = {
678 .magic = MAGIC_QTYPE_OPS,
679
680 .alloc = __videobuf_alloc,
681 .iolock = __videobuf_iolock,
682 .sync = __videobuf_sync,
683 .mmap_free = __videobuf_mmap_free,
684 .mmap_mapper = __videobuf_mmap_mapper,
685 .video_copy_to_user = __videobuf_copy_to_user,
686 .copy_stream = __videobuf_copy_stream,
687 .vmalloc = __videobuf_to_vmalloc,
688 };
689
690 void *videobuf_sg_alloc(size_t size)
691 {
692 struct videobuf_queue q;
693
694 /* Required to make generic handler to call __videobuf_alloc */
695 q.int_ops = &sg_ops;
696
697 q.msize = size;
698
699 return videobuf_alloc(&q);
700 }
701
702 void videobuf_queue_sg_init(struct videobuf_queue* q,
703 struct videobuf_queue_ops *ops,
704 struct device *dev,
705 spinlock_t *irqlock,
706 enum v4l2_buf_type type,
707 enum v4l2_field field,
708 unsigned int msize,
709 void *priv)
710 {
711 videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize,
712 priv, &sg_ops);
713 }
714
715 /* --------------------------------------------------------------------- */
716
717 EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
718
719 EXPORT_SYMBOL_GPL(videobuf_to_dma);
720 EXPORT_SYMBOL_GPL(videobuf_dma_init);
721 EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
722 EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
723 EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
724 EXPORT_SYMBOL_GPL(videobuf_dma_map);
725 EXPORT_SYMBOL_GPL(videobuf_dma_sync);
726 EXPORT_SYMBOL_GPL(videobuf_dma_unmap);
727 EXPORT_SYMBOL_GPL(videobuf_dma_free);
728
729 EXPORT_SYMBOL_GPL(videobuf_sg_dma_map);
730 EXPORT_SYMBOL_GPL(videobuf_sg_dma_unmap);
731 EXPORT_SYMBOL_GPL(videobuf_sg_alloc);
732
733 EXPORT_SYMBOL_GPL(videobuf_queue_sg_init);
734
735 /*
736 * Local variables:
737 * c-basic-offset: 8
738 * End:
739 */
Nao low-level kernelspace/userspace library that runs on our robots, Nao-Team HTWK