?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[PATCH] vfs: MS_VERBOSE should be MS_SILENT
[linux-2.6/verdex.git] / drivers / media / video / video-buf.c
blob87e937581d5aa679a837cb5ff0ec3deb1d68d070
1 /*
2 *
3 * generic helper functions for video4linux capture buffers, to handle
4 * memory management and PCI DMA. Right now bttv + saa7134 use it.
5 *
6 * The functions expect the hardware being able to scatter gatter
7 * (i.e. the buffers are not linear in physical memory, but fragmented
8 * into PAGE_SIZE chunks). They also assume the driver does not need
9 * to touch the video data (thus it is probably not useful for USB 1.1
10 * as data often must be uncompressed by the drivers).
11 *
12 * (c) 2001-2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 */
19
20 #include <linux/init.h>
21 #include <linux/module.h>
22 #include <linux/moduleparam.h>
23 #include <linux/vmalloc.h>
24 #include <linux/pagemap.h>
25 #include <linux/slab.h>
26 #include <linux/pci.h>
27 #include <linux/interrupt.h>
28 #include <asm/page.h>
29 #include <asm/pgtable.h>
30
31 #include <media/video-buf.h>
32
33 #define MAGIC_DMABUF 0x19721112
34 #define MAGIC_BUFFER 0x20040302
35 #define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \
36 { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }
37
38 static int debug = 0;
39 module_param(debug, int, 0644);
40
41 MODULE_DESCRIPTION("helper module to manage video4linux pci dma buffers");
42 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
43 MODULE_LICENSE("GPL");
44
45 #define dprintk(level, fmt, arg...) if (debug >= level) \
46 printk(KERN_DEBUG "vbuf: " fmt , ## arg)
47
48 struct scatterlist*
49 videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages)
50 {
51 struct scatterlist *sglist;
52 struct page *pg;
53 int i;
54
55 sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
56 if (NULL == sglist)
57 return NULL;
58 for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
59 pg = vmalloc_to_page(virt);
60 if (NULL == pg)
61 goto err;
62 BUG_ON(PageHighMem(pg));
63 sglist[i].page = pg;
64 sglist[i].length = PAGE_SIZE;
65 }
66 return sglist;
67
68 err:
69 kfree(sglist);
70 return NULL;
71 }
72
73 struct scatterlist*
74 videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset)
75 {
76 struct scatterlist *sglist;
77 int i = 0;
78
79 if (NULL == pages[0])
80 return NULL;
81 sglist = kcalloc(nr_pages, sizeof(*sglist), GFP_KERNEL);
82 if (NULL == sglist)
83 return NULL;
84
85 if (NULL == pages[0])
86 goto nopage;
87 if (PageHighMem(pages[0]))
88 /* DMA to highmem pages might not work */
89 goto highmem;
90 sglist[0].page = pages[0];
91 sglist[0].offset = offset;
92 sglist[0].length = PAGE_SIZE - offset;
93 for (i = 1; i < nr_pages; i++) {
94 if (NULL == pages[i])
95 goto nopage;
96 if (PageHighMem(pages[i]))
97 goto highmem;
98 sglist[i].page = pages[i];
99 sglist[i].length = PAGE_SIZE;
100 }
101 return sglist;
102
103 nopage:
104 dprintk(2,"sgl: oops - no page\n");
105 kfree(sglist);
106 return NULL;
107
108 highmem:
109 dprintk(2,"sgl: oops - highmem page\n");
110 kfree(sglist);
111 return NULL;
112 }
113
114 /* --------------------------------------------------------------------- */
115
116 void videobuf_dma_init(struct videobuf_dmabuf *dma)
117 {
118 memset(dma,0,sizeof(*dma));
119 dma->magic = MAGIC_DMABUF;
120 }
121
122 int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
123 unsigned long data, unsigned long size)
124 {
125 unsigned long first,last;
126 int err, rw = 0;
127
128 dma->direction = direction;
129 switch (dma->direction) {
130 case PCI_DMA_FROMDEVICE: rw = READ; break;
131 case PCI_DMA_TODEVICE: rw = WRITE; break;
132 default: BUG();
133 }
134
135 first = (data & PAGE_MASK) >> PAGE_SHIFT;
136 last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
137 dma->offset = data & ~PAGE_MASK;
138 dma->nr_pages = last-first+1;
139 dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*),
140 GFP_KERNEL);
141 if (NULL == dma->pages)
142 return -ENOMEM;
143 dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n",
144 data,size,dma->nr_pages);
145
146 down_read(&current->mm->mmap_sem);
147 err = get_user_pages(current,current->mm,
148 data & PAGE_MASK, dma->nr_pages,
149 rw == READ, 1, /* force */
150 dma->pages, NULL);
151 up_read(&current->mm->mmap_sem);
152 if (err != dma->nr_pages) {
153 dma->nr_pages = (err >= 0) ? err : 0;
154 dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages);
155 return err < 0 ? err : -EINVAL;
156 }
157 return 0;
158 }
159
160 int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
161 int nr_pages)
162 {
163 dprintk(1,"init kernel [%d pages]\n",nr_pages);
164 dma->direction = direction;
165 dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT);
166 if (NULL == dma->vmalloc) {
167 dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages);
168 return -ENOMEM;
169 }
170 memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT);
171 dma->nr_pages = nr_pages;
172 return 0;
173 }
174
175 int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
176 dma_addr_t addr, int nr_pages)
177 {
178 dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n",
179 nr_pages,(unsigned long)addr);
180 dma->direction = direction;
181 if (0 == addr)
182 return -EINVAL;
183
184 dma->bus_addr = addr;
185 dma->nr_pages = nr_pages;
186 return 0;
187 }
188
189 int videobuf_dma_pci_map(struct pci_dev *dev, struct videobuf_dmabuf *dma)
190 {
191 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
192 BUG_ON(0 == dma->nr_pages);
193
194 if (dma->pages) {
195 dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
196 dma->offset);
197 }
198 if (dma->vmalloc) {
199 dma->sglist = videobuf_vmalloc_to_sg
200 (dma->vmalloc,dma->nr_pages);
201 }
202 if (dma->bus_addr) {
203 dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL);
204 if (NULL != dma->sglist) {
205 dma->sglen = 1;
206 sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK;
207 dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK;
208 sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE;
209 }
210 }
211 if (NULL == dma->sglist) {
212 dprintk(1,"scatterlist is NULL\n");
213 return -ENOMEM;
214 }
215
216 if (!dma->bus_addr) {
217 dma->sglen = pci_map_sg(dev,dma->sglist,dma->nr_pages,
218 dma->direction);
219 if (0 == dma->sglen) {
220 printk(KERN_WARNING
221 "%s: pci_map_sg failed\n",__FUNCTION__);
222 kfree(dma->sglist);
223 dma->sglist = NULL;
224 dma->sglen = 0;
225 return -EIO;
226 }
227 }
228 return 0;
229 }
230
231 int videobuf_dma_pci_sync(struct pci_dev *dev, struct videobuf_dmabuf *dma)
232 {
233 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
234 BUG_ON(!dma->sglen);
235
236 if (!dma->bus_addr)
237 pci_dma_sync_sg_for_cpu(dev,dma->sglist,dma->nr_pages,dma->direction);
238 return 0;
239 }
240
241 int videobuf_dma_pci_unmap(struct pci_dev *dev, struct videobuf_dmabuf *dma)
242 {
243 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
244 if (!dma->sglen)
245 return 0;
246
247 if (!dma->bus_addr)
248 pci_unmap_sg(dev,dma->sglist,dma->nr_pages,dma->direction);
249 kfree(dma->sglist);
250 dma->sglist = NULL;
251 dma->sglen = 0;
252 return 0;
253 }
254
255 int videobuf_dma_free(struct videobuf_dmabuf *dma)
256 {
257 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
258 BUG_ON(dma->sglen);
259
260 if (dma->pages) {
261 int i;
262 for (i=0; i < dma->nr_pages; i++)
263 page_cache_release(dma->pages[i]);
264 kfree(dma->pages);
265 dma->pages = NULL;
266 }
267
268 vfree(dma->vmalloc);
269 dma->vmalloc = NULL;
270
271 if (dma->bus_addr) {
272 dma->bus_addr = 0;
273 }
274 dma->direction = PCI_DMA_NONE;
275 return 0;
276 }
277
278 /* --------------------------------------------------------------------- */
279
280 void* videobuf_alloc(unsigned int size)
281 {
282 struct videobuf_buffer *vb;
283
284 vb = kzalloc(size,GFP_KERNEL);
285 if (NULL != vb) {
286 videobuf_dma_init(&vb->dma);
287 init_waitqueue_head(&vb->done);
288 vb->magic = MAGIC_BUFFER;
289 }
290 return vb;
291 }
292
293 int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr)
294 {
295 int retval = 0;
296 DECLARE_WAITQUEUE(wait, current);
297
298 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
299 add_wait_queue(&vb->done, &wait);
300 while (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) {
301 if (non_blocking) {
302 retval = -EAGAIN;
303 break;
304 }
305 set_current_state(intr ? TASK_INTERRUPTIBLE
306 : TASK_UNINTERRUPTIBLE);
307 if (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED)
308 schedule();
309 set_current_state(TASK_RUNNING);
310 if (intr && signal_pending(current)) {
311 dprintk(1,"buffer waiton: -EINTR\n");
312 retval = -EINTR;
313 break;
314 }
315 }
316 remove_wait_queue(&vb->done, &wait);
317 return retval;
318 }
319
320 int
321 videobuf_iolock(struct pci_dev *pci, struct videobuf_buffer *vb,
322 struct v4l2_framebuffer *fbuf)
323 {
324 int err,pages;
325 dma_addr_t bus;
326
327 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
328 switch (vb->memory) {
329 case V4L2_MEMORY_MMAP:
330 case V4L2_MEMORY_USERPTR:
331 if (0 == vb->baddr) {
332 /* no userspace addr -- kernel bounce buffer */
333 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
334 err = videobuf_dma_init_kernel(&vb->dma,PCI_DMA_FROMDEVICE,
335 pages);
336 if (0 != err)
337 return err;
338 } else {
339 /* dma directly to userspace */
340 err = videobuf_dma_init_user(&vb->dma,PCI_DMA_FROMDEVICE,
341 vb->baddr,vb->bsize);
342 if (0 != err)
343 return err;
344 }
345 break;
346 case V4L2_MEMORY_OVERLAY:
347 if (NULL == fbuf)
348 return -EINVAL;
349 /* FIXME: need sanity checks for vb->boff */
350 bus = (dma_addr_t)fbuf->base + vb->boff;
351 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
352 err = videobuf_dma_init_overlay(&vb->dma,PCI_DMA_FROMDEVICE,
353 bus, pages);
354 if (0 != err)
355 return err;
356 break;
357 default:
358 BUG();
359 }
360 err = videobuf_dma_pci_map(pci,&vb->dma);
361 if (0 != err)
362 return err;
363
364 return 0;
365 }
366
367 /* --------------------------------------------------------------------- */
368
369 void videobuf_queue_init(struct videobuf_queue* q,
370 struct videobuf_queue_ops *ops,
371 struct pci_dev *pci,
372 spinlock_t *irqlock,
373 enum v4l2_buf_type type,
374 enum v4l2_field field,
375 unsigned int msize,
376 void *priv)
377 {
378 memset(q,0,sizeof(*q));
379 q->irqlock = irqlock;
380 q->pci = pci;
381 q->type = type;
382 q->field = field;
383 q->msize = msize;
384 q->ops = ops;
385 q->priv_data = priv;
386
387 mutex_init(&q->lock);
388 INIT_LIST_HEAD(&q->stream);
389 }
390
391 int
392 videobuf_queue_is_busy(struct videobuf_queue *q)
393 {
394 int i;
395
396 if (q->streaming) {
397 dprintk(1,"busy: streaming active\n");
398 return 1;
399 }
400 if (q->reading) {
401 dprintk(1,"busy: pending read #1\n");
402 return 1;
403 }
404 if (q->read_buf) {
405 dprintk(1,"busy: pending read #2\n");
406 return 1;
407 }
408 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
409 if (NULL == q->bufs[i])
410 continue;
411 if (q->bufs[i]->map) {
412 dprintk(1,"busy: buffer #%d mapped\n",i);
413 return 1;
414 }
415 if (q->bufs[i]->state == STATE_QUEUED) {
416 dprintk(1,"busy: buffer #%d queued\n",i);
417 return 1;
418 }
419 if (q->bufs[i]->state == STATE_ACTIVE) {
420 dprintk(1,"busy: buffer #%d avtive\n",i);
421 return 1;
422 }
423 }
424 return 0;
425 }
426
427 void
428 videobuf_queue_cancel(struct videobuf_queue *q)
429 {
430 unsigned long flags=0;
431 int i;
432
433 /* remove queued buffers from list */
434 spin_lock_irqsave(q->irqlock,flags);
435 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
436 if (NULL == q->bufs[i])
437 continue;
438 if (q->bufs[i]->state == STATE_QUEUED) {
439 list_del(&q->bufs[i]->queue);
440 q->bufs[i]->state = STATE_ERROR;
441 }
442 }
443 spin_unlock_irqrestore(q->irqlock,flags);
444
445 /* free all buffers + clear queue */
446 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
447 if (NULL == q->bufs[i])
448 continue;
449 q->ops->buf_release(q,q->bufs[i]);
450 }
451 INIT_LIST_HEAD(&q->stream);
452 }
453
454 /* --------------------------------------------------------------------- */
455
456 enum v4l2_field
457 videobuf_next_field(struct videobuf_queue *q)
458 {
459 enum v4l2_field field = q->field;
460
461 BUG_ON(V4L2_FIELD_ANY == field);
462
463 if (V4L2_FIELD_ALTERNATE == field) {
464 if (V4L2_FIELD_TOP == q->last) {
465 field = V4L2_FIELD_BOTTOM;
466 q->last = V4L2_FIELD_BOTTOM;
467 } else {
468 field = V4L2_FIELD_TOP;
469 q->last = V4L2_FIELD_TOP;
470 }
471 }
472 return field;
473 }
474
475 void
476 videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb,
477 enum v4l2_buf_type type)
478 {
479 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
480
481 b->index = vb->i;
482 b->type = type;
483
484 b->memory = vb->memory;
485 switch (b->memory) {
486 case V4L2_MEMORY_MMAP:
487 b->m.offset = vb->boff;
488 b->length = vb->bsize;
489 break;
490 case V4L2_MEMORY_USERPTR:
491 b->m.userptr = vb->baddr;
492 b->length = vb->bsize;
493 break;
494 case V4L2_MEMORY_OVERLAY:
495 b->m.offset = vb->boff;
496 break;
497 }
498
499 b->flags = 0;
500 if (vb->map)
501 b->flags |= V4L2_BUF_FLAG_MAPPED;
502
503 switch (vb->state) {
504 case STATE_PREPARED:
505 case STATE_QUEUED:
506 case STATE_ACTIVE:
507 b->flags |= V4L2_BUF_FLAG_QUEUED;
508 break;
509 case STATE_DONE:
510 case STATE_ERROR:
511 b->flags |= V4L2_BUF_FLAG_DONE;
512 break;
513 case STATE_NEEDS_INIT:
514 case STATE_IDLE:
515 /* nothing */
516 break;
517 }
518
519 if (vb->input != UNSET) {
520 b->flags |= V4L2_BUF_FLAG_INPUT;
521 b->input = vb->input;
522 }
523
524 b->field = vb->field;
525 b->timestamp = vb->ts;
526 b->bytesused = vb->size;
527 b->sequence = vb->field_count >> 1;
528 }
529
530 int
531 videobuf_reqbufs(struct videobuf_queue *q,
532 struct v4l2_requestbuffers *req)
533 {
534 unsigned int size,count;
535 int retval;
536
537 if (req->type != q->type)
538 return -EINVAL;
539 if (req->count < 1)
540 return -EINVAL;
541 if (req->memory != V4L2_MEMORY_MMAP &&
542 req->memory != V4L2_MEMORY_USERPTR &&
543 req->memory != V4L2_MEMORY_OVERLAY)
544 return -EINVAL;
545
546 if (q->streaming)
547 return -EBUSY;
548 if (!list_empty(&q->stream))
549 return -EBUSY;
550
551 mutex_lock(&q->lock);
552 count = req->count;
553 if (count > VIDEO_MAX_FRAME)
554 count = VIDEO_MAX_FRAME;
555 size = 0;
556 q->ops->buf_setup(q,&count,&size);
557 size = PAGE_ALIGN(size);
558 dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n",
559 count, size, (count*size)>>PAGE_SHIFT);
560
561 retval = videobuf_mmap_setup(q,count,size,req->memory);
562 if (retval < 0)
563 goto done;
564
565 req->count = count;
566
567 done:
568 mutex_unlock(&q->lock);
569 return retval;
570 }
571
572 int
573 videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
574 {
575 if (unlikely(b->type != q->type))
576 return -EINVAL;
577 if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME))
578 return -EINVAL;
579 if (unlikely(NULL == q->bufs[b->index]))
580 return -EINVAL;
581 videobuf_status(b,q->bufs[b->index],q->type);
582 return 0;
583 }
584
585 int
586 videobuf_qbuf(struct videobuf_queue *q,
587 struct v4l2_buffer *b)
588 {
589 struct videobuf_buffer *buf;
590 enum v4l2_field field;
591 unsigned long flags=0;
592 int retval;
593
594 mutex_lock(&q->lock);
595 retval = -EBUSY;
596 if (q->reading)
597 goto done;
598 retval = -EINVAL;
599 if (b->type != q->type)
600 goto done;
601 if (b->index < 0 || b->index >= VIDEO_MAX_FRAME)
602 goto done;
603 buf = q->bufs[b->index];
604 if (NULL == buf)
605 goto done;
606 MAGIC_CHECK(buf->magic,MAGIC_BUFFER);
607 if (buf->memory != b->memory)
608 goto done;
609 if (buf->state == STATE_QUEUED ||
610 buf->state == STATE_ACTIVE)
611 goto done;
612
613 if (b->flags & V4L2_BUF_FLAG_INPUT) {
614 if (b->input >= q->inputs)
615 goto done;
616 buf->input = b->input;
617 } else {
618 buf->input = UNSET;
619 }
620
621 switch (b->memory) {
622 case V4L2_MEMORY_MMAP:
623 if (0 == buf->baddr)
624 goto done;
625 break;
626 case V4L2_MEMORY_USERPTR:
627 if (b->length < buf->bsize)
628 goto done;
629 if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr)
630 q->ops->buf_release(q,buf);
631 buf->baddr = b->m.userptr;
632 break;
633 case V4L2_MEMORY_OVERLAY:
634 buf->boff = b->m.offset;
635 break;
636 default:
637 goto done;
638 }
639
640 field = videobuf_next_field(q);
641 retval = q->ops->buf_prepare(q,buf,field);
642 if (0 != retval)
643 goto done;
644
645 list_add_tail(&buf->stream,&q->stream);
646 if (q->streaming) {
647 spin_lock_irqsave(q->irqlock,flags);
648 q->ops->buf_queue(q,buf);
649 spin_unlock_irqrestore(q->irqlock,flags);
650 }
651 retval = 0;
652
653 done:
654 mutex_unlock(&q->lock);
655 return retval;
656 }
657
658 int
659 videobuf_dqbuf(struct videobuf_queue *q,
660 struct v4l2_buffer *b, int nonblocking)
661 {
662 struct videobuf_buffer *buf;
663 int retval;
664
665 mutex_lock(&q->lock);
666 retval = -EBUSY;
667 if (q->reading)
668 goto done;
669 retval = -EINVAL;
670 if (b->type != q->type)
671 goto done;
672 if (list_empty(&q->stream))
673 goto done;
674 buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
675 retval = videobuf_waiton(buf, nonblocking, 1);
676 if (retval < 0)
677 goto done;
678 switch (buf->state) {
679 case STATE_ERROR:
680 retval = -EIO;
681 /* fall through */
682 case STATE_DONE:
683 videobuf_dma_pci_sync(q->pci,&buf->dma);
684 buf->state = STATE_IDLE;
685 break;
686 default:
687 retval = -EINVAL;
688 goto done;
689 }
690 list_del(&buf->stream);
691 memset(b,0,sizeof(*b));
692 videobuf_status(b,buf,q->type);
693
694 done:
695 mutex_unlock(&q->lock);
696 return retval;
697 }
698
699 int videobuf_streamon(struct videobuf_queue *q)
700 {
701 struct videobuf_buffer *buf;
702 struct list_head *list;
703 unsigned long flags=0;
704 int retval;
705
706 mutex_lock(&q->lock);
707 retval = -EBUSY;
708 if (q->reading)
709 goto done;
710 retval = 0;
711 if (q->streaming)
712 goto done;
713 q->streaming = 1;
714 spin_lock_irqsave(q->irqlock,flags);
715 list_for_each(list,&q->stream) {
716 buf = list_entry(list, struct videobuf_buffer, stream);
717 if (buf->state == STATE_PREPARED)
718 q->ops->buf_queue(q,buf);
719 }
720 spin_unlock_irqrestore(q->irqlock,flags);
721
722 done:
723 mutex_unlock(&q->lock);
724 return retval;
725 }
726
727 int videobuf_streamoff(struct videobuf_queue *q)
728 {
729 int retval = -EINVAL;
730
731 mutex_lock(&q->lock);
732 if (!q->streaming)
733 goto done;
734 videobuf_queue_cancel(q);
735 q->streaming = 0;
736 retval = 0;
737
738 done:
739 mutex_unlock(&q->lock);
740 return retval;
741 }
742
743 static ssize_t
744 videobuf_read_zerocopy(struct videobuf_queue *q, char __user *data,
745 size_t count, loff_t *ppos)
746 {
747 enum v4l2_field field;
748 unsigned long flags=0;
749 int retval;
750
751 /* setup stuff */
752 q->read_buf = videobuf_alloc(q->msize);
753 if (NULL == q->read_buf)
754 return -ENOMEM;
755
756 q->read_buf->memory = V4L2_MEMORY_USERPTR;
757 q->read_buf->baddr = (unsigned long)data;
758 q->read_buf->bsize = count;
759 field = videobuf_next_field(q);
760 retval = q->ops->buf_prepare(q,q->read_buf,field);
761 if (0 != retval)
762 goto done;
763
764 /* start capture & wait */
765 spin_lock_irqsave(q->irqlock,flags);
766 q->ops->buf_queue(q,q->read_buf);
767 spin_unlock_irqrestore(q->irqlock,flags);
768 retval = videobuf_waiton(q->read_buf,0,0);
769 if (0 == retval) {
770 videobuf_dma_pci_sync(q->pci,&q->read_buf->dma);
771 if (STATE_ERROR == q->read_buf->state)
772 retval = -EIO;
773 else
774 retval = q->read_buf->size;
775 }
776
777 done:
778 /* cleanup */
779 q->ops->buf_release(q,q->read_buf);
780 kfree(q->read_buf);
781 q->read_buf = NULL;
782 return retval;
783 }
784
785 ssize_t videobuf_read_one(struct videobuf_queue *q,
786 char __user *data, size_t count, loff_t *ppos,
787 int nonblocking)
788 {
789 enum v4l2_field field;
790 unsigned long flags=0;
791 unsigned size, nbufs, bytes;
792 int retval;
793
794 mutex_lock(&q->lock);
795
796 nbufs = 1; size = 0;
797 q->ops->buf_setup(q,&nbufs,&size);
798 if (NULL == q->read_buf &&
799 count >= size &&
800 !nonblocking) {
801 retval = videobuf_read_zerocopy(q,data,count,ppos);
802 if (retval >= 0 || retval == -EIO)
803 /* ok, all done */
804 goto done;
805 /* fallback to kernel bounce buffer on failures */
806 }
807
808 if (NULL == q->read_buf) {
809 /* need to capture a new frame */
810 retval = -ENOMEM;
811 q->read_buf = videobuf_alloc(q->msize);
812 if (NULL == q->read_buf)
813 goto done;
814 q->read_buf->memory = V4L2_MEMORY_USERPTR;
815 q->read_buf->bsize = count; /* preferred size */
816 field = videobuf_next_field(q);
817 retval = q->ops->buf_prepare(q,q->read_buf,field);
818 if (0 != retval) {
819 kfree (q->read_buf);
820 q->read_buf = NULL;
821 goto done;
822 }
823 spin_lock_irqsave(q->irqlock,flags);
824 q->ops->buf_queue(q,q->read_buf);
825 spin_unlock_irqrestore(q->irqlock,flags);
826 q->read_off = 0;
827 }
828
829 /* wait until capture is done */
830 retval = videobuf_waiton(q->read_buf, nonblocking, 1);
831 if (0 != retval)
832 goto done;
833 videobuf_dma_pci_sync(q->pci,&q->read_buf->dma);
834
835 if (STATE_ERROR == q->read_buf->state) {
836 /* catch I/O errors */
837 q->ops->buf_release(q,q->read_buf);
838 kfree(q->read_buf);
839 q->read_buf = NULL;
840 retval = -EIO;
841 goto done;
842 }
843
844 /* copy to userspace */
845 bytes = count;
846 if (bytes > q->read_buf->size - q->read_off)
847 bytes = q->read_buf->size - q->read_off;
848 retval = -EFAULT;
849 if (copy_to_user(data, q->read_buf->dma.vmalloc+q->read_off, bytes))
850 goto done;
851
852 retval = bytes;
853 q->read_off += bytes;
854 if (q->read_off == q->read_buf->size) {
855 /* all data copied, cleanup */
856 q->ops->buf_release(q,q->read_buf);
857 kfree(q->read_buf);
858 q->read_buf = NULL;
859 }
860
861 done:
862 mutex_unlock(&q->lock);
863 return retval;
864 }
865
866 int videobuf_read_start(struct videobuf_queue *q)
867 {
868 enum v4l2_field field;
869 unsigned long flags=0;
870 int count = 0, size = 0;
871 int err, i;
872
873 q->ops->buf_setup(q,&count,&size);
874 if (count < 2)
875 count = 2;
876 if (count > VIDEO_MAX_FRAME)
877 count = VIDEO_MAX_FRAME;
878 size = PAGE_ALIGN(size);
879
880 err = videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR);
881 if (err)
882 return err;
883 for (i = 0; i < count; i++) {
884 field = videobuf_next_field(q);
885 err = q->ops->buf_prepare(q,q->bufs[i],field);
886 if (err)
887 return err;
888 list_add_tail(&q->bufs[i]->stream, &q->stream);
889 }
890 spin_lock_irqsave(q->irqlock,flags);
891 for (i = 0; i < count; i++)
892 q->ops->buf_queue(q,q->bufs[i]);
893 spin_unlock_irqrestore(q->irqlock,flags);
894 q->reading = 1;
895 return 0;
896 }
897
898 void videobuf_read_stop(struct videobuf_queue *q)
899 {
900 int i;
901
902 videobuf_queue_cancel(q);
903 videobuf_mmap_free(q);
904 INIT_LIST_HEAD(&q->stream);
905 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
906 if (NULL == q->bufs[i])
907 continue;
908 kfree(q->bufs[i]);
909 q->bufs[i] = NULL;
910 }
911 q->read_buf = NULL;
912 q->reading = 0;
913 }
914
915 ssize_t videobuf_read_stream(struct videobuf_queue *q,
916 char __user *data, size_t count, loff_t *ppos,
917 int vbihack, int nonblocking)
918 {
919 unsigned int *fc, bytes;
920 int err, retval;
921 unsigned long flags=0;
922
923 dprintk(2,"%s\n",__FUNCTION__);
924 mutex_lock(&q->lock);
925 retval = -EBUSY;
926 if (q->streaming)
927 goto done;
928 if (!q->reading) {
929 retval = videobuf_read_start(q);
930 if (retval < 0)
931 goto done;
932 }
933
934 retval = 0;
935 while (count > 0) {
936 /* get / wait for data */
937 if (NULL == q->read_buf) {
938 q->read_buf = list_entry(q->stream.next,
939 struct videobuf_buffer,
940 stream);
941 list_del(&q->read_buf->stream);
942 q->read_off = 0;
943 }
944 err = videobuf_waiton(q->read_buf, nonblocking, 1);
945 if (err < 0) {
946 if (0 == retval)
947 retval = err;
948 break;
949 }
950
951 if (q->read_buf->state == STATE_DONE) {
952 if (vbihack) {
953 /* dirty, undocumented hack -- pass the frame counter
954 * within the last four bytes of each vbi data block.
955 * We need that one to maintain backward compatibility
956 * to all vbi decoding software out there ... */
957 fc = (unsigned int*)q->read_buf->dma.vmalloc;
958 fc += (q->read_buf->size>>2) -1;
959 *fc = q->read_buf->field_count >> 1;
960 dprintk(1,"vbihack: %d\n",*fc);
961 }
962
963 /* copy stuff */
964 bytes = count;
965 if (bytes > q->read_buf->size - q->read_off)
966 bytes = q->read_buf->size - q->read_off;
967 if (copy_to_user(data + retval,
968 q->read_buf->dma.vmalloc + q->read_off,
969 bytes)) {
970 if (0 == retval)
971 retval = -EFAULT;
972 break;
973 }
974 count -= bytes;
975 retval += bytes;
976 q->read_off += bytes;
977 } else {
978 /* some error */
979 q->read_off = q->read_buf->size;
980 if (0 == retval)
981 retval = -EIO;
982 }
983
984 /* requeue buffer when done with copying */
985 if (q->read_off == q->read_buf->size) {
986 list_add_tail(&q->read_buf->stream,
987 &q->stream);
988 spin_lock_irqsave(q->irqlock,flags);
989 q->ops->buf_queue(q,q->read_buf);
990 spin_unlock_irqrestore(q->irqlock,flags);
991 q->read_buf = NULL;
992 }
993 if (retval < 0)
994 break;
995 }
996
997 done:
998 mutex_unlock(&q->lock);
999 return retval;
1000 }
1001
1002 unsigned int videobuf_poll_stream(struct file *file,
1003 struct videobuf_queue *q,
1004 poll_table *wait)
1005 {
1006 struct videobuf_buffer *buf = NULL;
1007 unsigned int rc = 0;
1008
1009 mutex_lock(&q->lock);
1010 if (q->streaming) {
1011 if (!list_empty(&q->stream))
1012 buf = list_entry(q->stream.next,
1013 struct videobuf_buffer, stream);
1014 } else {
1015 if (!q->reading)
1016 videobuf_read_start(q);
1017 if (!q->reading) {
1018 rc = POLLERR;
1019 } else if (NULL == q->read_buf) {
1020 q->read_buf = list_entry(q->stream.next,
1021 struct videobuf_buffer,
1022 stream);
1023 list_del(&q->read_buf->stream);
1024 q->read_off = 0;
1025 }
1026 buf = q->read_buf;
1027 }
1028 if (!buf)
1029 rc = POLLERR;
1030
1031 if (0 == rc) {
1032 poll_wait(file, &buf->done, wait);
1033 if (buf->state == STATE_DONE ||
1034 buf->state == STATE_ERROR)
1035 rc = POLLIN|POLLRDNORM;
1036 }
1037 mutex_unlock(&q->lock);
1038 return rc;
1039 }
1040
1041 /* --------------------------------------------------------------------- */
1042
1043 static void
1044 videobuf_vm_open(struct vm_area_struct *vma)
1045 {
1046 struct videobuf_mapping *map = vma->vm_private_data;
1047
1048 dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
1049 map->count,vma->vm_start,vma->vm_end);
1050 map->count++;
1051 }
1052
1053 static void
1054 videobuf_vm_close(struct vm_area_struct *vma)
1055 {
1056 struct videobuf_mapping *map = vma->vm_private_data;
1057 struct videobuf_queue *q = map->q;
1058 int i;
1059
1060 dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
1061 map->count,vma->vm_start,vma->vm_end);
1062
1063 map->count--;
1064 if (0 == map->count) {
1065 dprintk(1,"munmap %p q=%p\n",map,q);
1066 mutex_lock(&q->lock);
1067 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1068 if (NULL == q->bufs[i])
1069 continue;
1070 if (q->bufs[i])
1071 ;
1072 if (q->bufs[i]->map != map)
1073 continue;
1074 q->bufs[i]->map = NULL;
1075 q->bufs[i]->baddr = 0;
1076 q->ops->buf_release(q,q->bufs[i]);
1077 }
1078 mutex_unlock(&q->lock);
1079 kfree(map);
1080 }
1081 return;
1082 }
1083
1084 /*
1085 * Get a anonymous page for the mapping. Make sure we can DMA to that
1086 * memory location with 32bit PCI devices (i.e. don't use highmem for
1087 * now ...). Bounce buffers don't work very well for the data rates
1088 * video capture has.
1089 */
1090 static struct page*
1091 videobuf_vm_nopage(struct vm_area_struct *vma, unsigned long vaddr,
1092 int *type)
1093 {
1094 struct page *page;
1095
1096 dprintk(3,"nopage: fault @ %08lx [vma %08lx-%08lx]\n",
1097 vaddr,vma->vm_start,vma->vm_end);
1098 if (vaddr > vma->vm_end)
1099 return NOPAGE_SIGBUS;
1100 page = alloc_page(GFP_USER);
1101 if (!page)
1102 return NOPAGE_OOM;
1103 clear_user_page(page_address(page), vaddr, page);
1104 if (type)
1105 *type = VM_FAULT_MINOR;
1106 return page;
1107 }
1108
1109 static struct vm_operations_struct videobuf_vm_ops =
1110 {
1111 .open = videobuf_vm_open,
1112 .close = videobuf_vm_close,
1113 .nopage = videobuf_vm_nopage,
1114 };
1115
1116 int videobuf_mmap_setup(struct videobuf_queue *q,
1117 unsigned int bcount, unsigned int bsize,
1118 enum v4l2_memory memory)
1119 {
1120 unsigned int i;
1121 int err;
1122
1123 err = videobuf_mmap_free(q);
1124 if (0 != err)
1125 return err;
1126
1127 for (i = 0; i < bcount; i++) {
1128 q->bufs[i] = videobuf_alloc(q->msize);
1129 q->bufs[i]->i = i;
1130 q->bufs[i]->input = UNSET;
1131 q->bufs[i]->memory = memory;
1132 q->bufs[i]->bsize = bsize;
1133 switch (memory) {
1134 case V4L2_MEMORY_MMAP:
1135 q->bufs[i]->boff = bsize * i;
1136 break;
1137 case V4L2_MEMORY_USERPTR:
1138 case V4L2_MEMORY_OVERLAY:
1139 /* nothing */
1140 break;
1141 }
1142 }
1143 dprintk(1,"mmap setup: %d buffers, %d bytes each\n",
1144 bcount,bsize);
1145 return 0;
1146 }
1147
1148 int videobuf_mmap_free(struct videobuf_queue *q)
1149 {
1150 int i;
1151
1152 for (i = 0; i < VIDEO_MAX_FRAME; i++)
1153 if (q->bufs[i] && q->bufs[i]->map)
1154 return -EBUSY;
1155 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1156 if (NULL == q->bufs[i])
1157 continue;
1158 q->ops->buf_release(q,q->bufs[i]);
1159 kfree(q->bufs[i]);
1160 q->bufs[i] = NULL;
1161 }
1162 return 0;
1163 }
1164
1165 int videobuf_mmap_mapper(struct videobuf_queue *q,
1166 struct vm_area_struct *vma)
1167 {
1168 struct videobuf_mapping *map;
1169 unsigned int first,last,size,i;
1170 int retval;
1171
1172 mutex_lock(&q->lock);
1173 retval = -EINVAL;
1174 if (!(vma->vm_flags & VM_WRITE)) {
1175 dprintk(1,"mmap app bug: PROT_WRITE please\n");
1176 goto done;
1177 }
1178 if (!(vma->vm_flags & VM_SHARED)) {
1179 dprintk(1,"mmap app bug: MAP_SHARED please\n");
1180 goto done;
1181 }
1182
1183 /* look for first buffer to map */
1184 for (first = 0; first < VIDEO_MAX_FRAME; first++) {
1185 if (NULL == q->bufs[first])
1186 continue;
1187 if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
1188 continue;
1189 if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
1190 break;
1191 }
1192 if (VIDEO_MAX_FRAME == first) {
1193 dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
1194 (vma->vm_pgoff << PAGE_SHIFT));
1195 goto done;
1196 }
1197
1198 /* look for last buffer to map */
1199 for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
1200 if (NULL == q->bufs[last])
1201 continue;
1202 if (V4L2_MEMORY_MMAP != q->bufs[last]->memory)
1203 continue;
1204 if (q->bufs[last]->map) {
1205 retval = -EBUSY;
1206 goto done;
1207 }
1208 size += q->bufs[last]->bsize;
1209 if (size == (vma->vm_end - vma->vm_start))
1210 break;
1211 }
1212 if (VIDEO_MAX_FRAME == last) {
1213 dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n",
1214 (vma->vm_end - vma->vm_start));
1215 goto done;
1216 }
1217
1218 /* create mapping + update buffer list */
1219 retval = -ENOMEM;
1220 map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
1221 if (NULL == map)
1222 goto done;
1223 for (size = 0, i = first; i <= last; size += q->bufs[i++]->bsize) {
1224 q->bufs[i]->map = map;
1225 q->bufs[i]->baddr = vma->vm_start + size;
1226 }
1227 map->count = 1;
1228 map->start = vma->vm_start;
1229 map->end = vma->vm_end;
1230 map->q = q;
1231 vma->vm_ops = &videobuf_vm_ops;
1232 vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
1233 vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
1234 vma->vm_private_data = map;
1235 dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n",
1236 map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
1237 retval = 0;
1238
1239 done:
1240 mutex_unlock(&q->lock);
1241 return retval;
1242 }
1243
1244 /* --------------------------------------------------------------------- */
1245
1246 EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
1247
1248 EXPORT_SYMBOL_GPL(videobuf_dma_init);
1249 EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
1250 EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
1251 EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
1252 EXPORT_SYMBOL_GPL(videobuf_dma_pci_map);
1253 EXPORT_SYMBOL_GPL(videobuf_dma_pci_sync);
1254 EXPORT_SYMBOL_GPL(videobuf_dma_pci_unmap);
1255 EXPORT_SYMBOL_GPL(videobuf_dma_free);
1256
1257 EXPORT_SYMBOL_GPL(videobuf_alloc);
1258 EXPORT_SYMBOL_GPL(videobuf_waiton);
1259 EXPORT_SYMBOL_GPL(videobuf_iolock);
1260
1261 EXPORT_SYMBOL_GPL(videobuf_queue_init);
1262 EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
1263 EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
1264
1265 EXPORT_SYMBOL_GPL(videobuf_next_field);
1266 EXPORT_SYMBOL_GPL(videobuf_status);
1267 EXPORT_SYMBOL_GPL(videobuf_reqbufs);
1268 EXPORT_SYMBOL_GPL(videobuf_querybuf);
1269 EXPORT_SYMBOL_GPL(videobuf_qbuf);
1270 EXPORT_SYMBOL_GPL(videobuf_dqbuf);
1271 EXPORT_SYMBOL_GPL(videobuf_streamon);
1272 EXPORT_SYMBOL_GPL(videobuf_streamoff);
1273
1274 EXPORT_SYMBOL_GPL(videobuf_read_start);
1275 EXPORT_SYMBOL_GPL(videobuf_read_stop);
1276 EXPORT_SYMBOL_GPL(videobuf_read_stream);
1277 EXPORT_SYMBOL_GPL(videobuf_read_one);
1278 EXPORT_SYMBOL_GPL(videobuf_poll_stream);
1279
1280 EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
1281 EXPORT_SYMBOL_GPL(videobuf_mmap_free);
1282 EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);
1283
1284 /*
1285 * Local variables:
1286 * c-basic-offset: 8
1287 * End:
1288 */
Verdex Pro support