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V4L/DVB (3344a): Conversions from kmalloc+memset to k(z|c)alloc
[GitHub/mt8127/android_kernel_alcatel_ttab.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. 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 if (PageHighMem(pg))
63 BUG();
64 sglist[i].page = pg;
65 sglist[i].length = PAGE_SIZE;
66 }
67 return sglist;
68
69 err:
70 kfree(sglist);
71 return NULL;
72 }
73
74 struct scatterlist*
75 videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset)
76 {
77 struct scatterlist *sglist;
78 int i = 0;
79
80 if (NULL == pages[0])
81 return NULL;
82 sglist = kcalloc(nr_pages, sizeof(*sglist), GFP_KERNEL);
83 if (NULL == sglist)
84 return NULL;
85
86 if (NULL == pages[0])
87 goto nopage;
88 if (PageHighMem(pages[0]))
89 /* DMA to highmem pages might not work */
90 goto highmem;
91 sglist[0].page = pages[0];
92 sglist[0].offset = offset;
93 sglist[0].length = PAGE_SIZE - offset;
94 for (i = 1; i < nr_pages; i++) {
95 if (NULL == pages[i])
96 goto nopage;
97 if (PageHighMem(pages[i]))
98 goto highmem;
99 sglist[i].page = pages[i];
100 sglist[i].length = PAGE_SIZE;
101 }
102 return sglist;
103
104 nopage:
105 dprintk(2,"sgl: oops - no page\n");
106 kfree(sglist);
107 return NULL;
108
109 highmem:
110 dprintk(2,"sgl: oops - highmem page\n");
111 kfree(sglist);
112 return NULL;
113 }
114
115 /* --------------------------------------------------------------------- */
116
117 void videobuf_dma_init(struct videobuf_dmabuf *dma)
118 {
119 memset(dma,0,sizeof(*dma));
120 dma->magic = MAGIC_DMABUF;
121 }
122
123 int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
124 unsigned long data, unsigned long size)
125 {
126 unsigned long first,last;
127 int err, rw = 0;
128
129 dma->direction = direction;
130 switch (dma->direction) {
131 case PCI_DMA_FROMDEVICE: rw = READ; break;
132 case PCI_DMA_TODEVICE: rw = WRITE; break;
133 default: BUG();
134 }
135
136 first = (data & PAGE_MASK) >> PAGE_SHIFT;
137 last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
138 dma->offset = data & ~PAGE_MASK;
139 dma->nr_pages = last-first+1;
140 dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*),
141 GFP_KERNEL);
142 if (NULL == dma->pages)
143 return -ENOMEM;
144 dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n",
145 data,size,dma->nr_pages);
146
147 down_read(&current->mm->mmap_sem);
148 err = get_user_pages(current,current->mm,
149 data & PAGE_MASK, dma->nr_pages,
150 rw == READ, 1, /* force */
151 dma->pages, NULL);
152 up_read(&current->mm->mmap_sem);
153 if (err != dma->nr_pages) {
154 dma->nr_pages = (err >= 0) ? err : 0;
155 dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages);
156 return err < 0 ? err : -EINVAL;
157 }
158 return 0;
159 }
160
161 int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
162 int nr_pages)
163 {
164 dprintk(1,"init kernel [%d pages]\n",nr_pages);
165 dma->direction = direction;
166 dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT);
167 if (NULL == dma->vmalloc) {
168 dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages);
169 return -ENOMEM;
170 }
171 memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT);
172 dma->nr_pages = nr_pages;
173 return 0;
174 }
175
176 int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
177 dma_addr_t addr, int nr_pages)
178 {
179 dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n",
180 nr_pages,(unsigned long)addr);
181 dma->direction = direction;
182 if (0 == addr)
183 return -EINVAL;
184
185 dma->bus_addr = addr;
186 dma->nr_pages = nr_pages;
187 return 0;
188 }
189
190 int videobuf_dma_pci_map(struct pci_dev *dev, struct videobuf_dmabuf *dma)
191 {
192 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
193 BUG_ON(0 == dma->nr_pages);
194
195 if (dma->pages) {
196 dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
197 dma->offset);
198 }
199 if (dma->vmalloc) {
200 dma->sglist = videobuf_vmalloc_to_sg
201 (dma->vmalloc,dma->nr_pages);
202 }
203 if (dma->bus_addr) {
204 dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL);
205 if (NULL != dma->sglist) {
206 dma->sglen = 1;
207 sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK;
208 dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK;
209 sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE;
210 }
211 }
212 if (NULL == dma->sglist) {
213 dprintk(1,"scatterlist is NULL\n");
214 return -ENOMEM;
215 }
216
217 if (!dma->bus_addr) {
218 dma->sglen = pci_map_sg(dev,dma->sglist,dma->nr_pages,
219 dma->direction);
220 if (0 == dma->sglen) {
221 printk(KERN_WARNING
222 "%s: pci_map_sg failed\n",__FUNCTION__);
223 kfree(dma->sglist);
224 dma->sglist = NULL;
225 dma->sglen = 0;
226 return -EIO;
227 }
228 }
229 return 0;
230 }
231
232 int videobuf_dma_pci_sync(struct pci_dev *dev, struct videobuf_dmabuf *dma)
233 {
234 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
235 BUG_ON(!dma->sglen);
236
237 if (!dma->bus_addr)
238 pci_dma_sync_sg_for_cpu(dev,dma->sglist,dma->nr_pages,dma->direction);
239 return 0;
240 }
241
242 int videobuf_dma_pci_unmap(struct pci_dev *dev, struct videobuf_dmabuf *dma)
243 {
244 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
245 if (!dma->sglen)
246 return 0;
247
248 if (!dma->bus_addr)
249 pci_unmap_sg(dev,dma->sglist,dma->nr_pages,dma->direction);
250 kfree(dma->sglist);
251 dma->sglist = NULL;
252 dma->sglen = 0;
253 return 0;
254 }
255
256 int videobuf_dma_free(struct videobuf_dmabuf *dma)
257 {
258 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
259 BUG_ON(dma->sglen);
260
261 if (dma->pages) {
262 int i;
263 for (i=0; i < dma->nr_pages; i++)
264 page_cache_release(dma->pages[i]);
265 kfree(dma->pages);
266 dma->pages = NULL;
267 }
268
269 vfree(dma->vmalloc);
270 dma->vmalloc = NULL;
271
272 if (dma->bus_addr) {
273 dma->bus_addr = 0;
274 }
275 dma->direction = PCI_DMA_NONE;
276 return 0;
277 }
278
279 /* --------------------------------------------------------------------- */
280
281 void* videobuf_alloc(unsigned int size)
282 {
283 struct videobuf_buffer *vb;
284
285 vb = kzalloc(size,GFP_KERNEL);
286 if (NULL != vb) {
287 videobuf_dma_init(&vb->dma);
288 init_waitqueue_head(&vb->done);
289 vb->magic = MAGIC_BUFFER;
290 }
291 return vb;
292 }
293
294 int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr)
295 {
296 int retval = 0;
297 DECLARE_WAITQUEUE(wait, current);
298
299 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
300 add_wait_queue(&vb->done, &wait);
301 while (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) {
302 if (non_blocking) {
303 retval = -EAGAIN;
304 break;
305 }
306 set_current_state(intr ? TASK_INTERRUPTIBLE
307 : TASK_UNINTERRUPTIBLE);
308 if (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED)
309 schedule();
310 set_current_state(TASK_RUNNING);
311 if (intr && signal_pending(current)) {
312 dprintk(1,"buffer waiton: -EINTR\n");
313 retval = -EINTR;
314 break;
315 }
316 }
317 remove_wait_queue(&vb->done, &wait);
318 return retval;
319 }
320
321 int
322 videobuf_iolock(struct pci_dev *pci, struct videobuf_buffer *vb,
323 struct v4l2_framebuffer *fbuf)
324 {
325 int err,pages;
326 dma_addr_t bus;
327
328 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
329 switch (vb->memory) {
330 case V4L2_MEMORY_MMAP:
331 case V4L2_MEMORY_USERPTR:
332 if (0 == vb->baddr) {
333 /* no userspace addr -- kernel bounce buffer */
334 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
335 err = videobuf_dma_init_kernel(&vb->dma,PCI_DMA_FROMDEVICE,
336 pages);
337 if (0 != err)
338 return err;
339 } else {
340 /* dma directly to userspace */
341 err = videobuf_dma_init_user(&vb->dma,PCI_DMA_FROMDEVICE,
342 vb->baddr,vb->bsize);
343 if (0 != err)
344 return err;
345 }
346 break;
347 case V4L2_MEMORY_OVERLAY:
348 if (NULL == fbuf)
349 return -EINVAL;
350 /* FIXME: need sanity checks for vb->boff */
351 bus = (dma_addr_t)fbuf->base + vb->boff;
352 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
353 err = videobuf_dma_init_overlay(&vb->dma,PCI_DMA_FROMDEVICE,
354 bus, pages);
355 if (0 != err)
356 return err;
357 break;
358 default:
359 BUG();
360 }
361 err = videobuf_dma_pci_map(pci,&vb->dma);
362 if (0 != err)
363 return err;
364
365 return 0;
366 }
367
368 /* --------------------------------------------------------------------- */
369
370 void videobuf_queue_init(struct videobuf_queue* q,
371 struct videobuf_queue_ops *ops,
372 struct pci_dev *pci,
373 spinlock_t *irqlock,
374 enum v4l2_buf_type type,
375 enum v4l2_field field,
376 unsigned int msize,
377 void *priv)
378 {
379 memset(q,0,sizeof(*q));
380 q->irqlock = irqlock;
381 q->pci = pci;
382 q->type = type;
383 q->field = field;
384 q->msize = msize;
385 q->ops = ops;
386 q->priv_data = priv;
387
388 init_MUTEX(&q->lock);
389 INIT_LIST_HEAD(&q->stream);
390 }
391
392 int
393 videobuf_queue_is_busy(struct videobuf_queue *q)
394 {
395 int i;
396
397 if (q->streaming) {
398 dprintk(1,"busy: streaming active\n");
399 return 1;
400 }
401 if (q->reading) {
402 dprintk(1,"busy: pending read #1\n");
403 return 1;
404 }
405 if (q->read_buf) {
406 dprintk(1,"busy: pending read #2\n");
407 return 1;
408 }
409 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
410 if (NULL == q->bufs[i])
411 continue;
412 if (q->bufs[i]->map) {
413 dprintk(1,"busy: buffer #%d mapped\n",i);
414 return 1;
415 }
416 if (q->bufs[i]->state == STATE_QUEUED) {
417 dprintk(1,"busy: buffer #%d queued\n",i);
418 return 1;
419 }
420 if (q->bufs[i]->state == STATE_ACTIVE) {
421 dprintk(1,"busy: buffer #%d avtive\n",i);
422 return 1;
423 }
424 }
425 return 0;
426 }
427
428 void
429 videobuf_queue_cancel(struct videobuf_queue *q)
430 {
431 unsigned long flags;
432 int i;
433
434 /* remove queued buffers from list */
435 spin_lock_irqsave(q->irqlock,flags);
436 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
437 if (NULL == q->bufs[i])
438 continue;
439 if (q->bufs[i]->state == STATE_QUEUED) {
440 list_del(&q->bufs[i]->queue);
441 q->bufs[i]->state = STATE_ERROR;
442 }
443 }
444 spin_unlock_irqrestore(q->irqlock,flags);
445
446 /* free all buffers + clear queue */
447 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
448 if (NULL == q->bufs[i])
449 continue;
450 q->ops->buf_release(q,q->bufs[i]);
451 }
452 INIT_LIST_HEAD(&q->stream);
453 }
454
455 /* --------------------------------------------------------------------- */
456
457 enum v4l2_field
458 videobuf_next_field(struct videobuf_queue *q)
459 {
460 enum v4l2_field field = q->field;
461
462 BUG_ON(V4L2_FIELD_ANY == field);
463
464 if (V4L2_FIELD_ALTERNATE == field) {
465 if (V4L2_FIELD_TOP == q->last) {
466 field = V4L2_FIELD_BOTTOM;
467 q->last = V4L2_FIELD_BOTTOM;
468 } else {
469 field = V4L2_FIELD_TOP;
470 q->last = V4L2_FIELD_TOP;
471 }
472 }
473 return field;
474 }
475
476 void
477 videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb,
478 enum v4l2_buf_type type)
479 {
480 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
481
482 b->index = vb->i;
483 b->type = type;
484
485 b->memory = vb->memory;
486 switch (b->memory) {
487 case V4L2_MEMORY_MMAP:
488 b->m.offset = vb->boff;
489 b->length = vb->bsize;
490 break;
491 case V4L2_MEMORY_USERPTR:
492 b->m.userptr = vb->baddr;
493 b->length = vb->bsize;
494 break;
495 case V4L2_MEMORY_OVERLAY:
496 b->m.offset = vb->boff;
497 break;
498 }
499
500 b->flags = 0;
501 if (vb->map)
502 b->flags |= V4L2_BUF_FLAG_MAPPED;
503
504 switch (vb->state) {
505 case STATE_PREPARED:
506 case STATE_QUEUED:
507 case STATE_ACTIVE:
508 b->flags |= V4L2_BUF_FLAG_QUEUED;
509 break;
510 case STATE_DONE:
511 case STATE_ERROR:
512 b->flags |= V4L2_BUF_FLAG_DONE;
513 break;
514 case STATE_NEEDS_INIT:
515 case STATE_IDLE:
516 /* nothing */
517 break;
518 }
519
520 if (vb->input != UNSET) {
521 b->flags |= V4L2_BUF_FLAG_INPUT;
522 b->input = vb->input;
523 }
524
525 b->field = vb->field;
526 b->timestamp = vb->ts;
527 b->bytesused = vb->size;
528 b->sequence = vb->field_count >> 1;
529 }
530
531 int
532 videobuf_reqbufs(struct videobuf_queue *q,
533 struct v4l2_requestbuffers *req)
534 {
535 unsigned int size,count;
536 int retval;
537
538 if (req->type != q->type)
539 return -EINVAL;
540 if (req->count < 1)
541 return -EINVAL;
542 if (req->memory != V4L2_MEMORY_MMAP &&
543 req->memory != V4L2_MEMORY_USERPTR &&
544 req->memory != V4L2_MEMORY_OVERLAY)
545 return -EINVAL;
546
547 if (q->streaming)
548 return -EBUSY;
549 if (!list_empty(&q->stream))
550 return -EBUSY;
551
552 down(&q->lock);
553 count = req->count;
554 if (count > VIDEO_MAX_FRAME)
555 count = VIDEO_MAX_FRAME;
556 size = 0;
557 q->ops->buf_setup(q,&count,&size);
558 size = PAGE_ALIGN(size);
559 dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n",
560 count, size, (count*size)>>PAGE_SHIFT);
561
562 retval = videobuf_mmap_setup(q,count,size,req->memory);
563 if (retval < 0)
564 goto done;
565
566 req->count = count;
567
568 done:
569 up(&q->lock);
570 return retval;
571 }
572
573 int
574 videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
575 {
576 if (unlikely(b->type != q->type))
577 return -EINVAL;
578 if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME))
579 return -EINVAL;
580 if (unlikely(NULL == q->bufs[b->index]))
581 return -EINVAL;
582 videobuf_status(b,q->bufs[b->index],q->type);
583 return 0;
584 }
585
586 int
587 videobuf_qbuf(struct videobuf_queue *q,
588 struct v4l2_buffer *b)
589 {
590 struct videobuf_buffer *buf;
591 enum v4l2_field field;
592 unsigned long flags;
593 int retval;
594
595 down(&q->lock);
596 retval = -EBUSY;
597 if (q->reading)
598 goto done;
599 retval = -EINVAL;
600 if (b->type != q->type)
601 goto done;
602 if (b->index < 0 || b->index >= VIDEO_MAX_FRAME)
603 goto done;
604 buf = q->bufs[b->index];
605 if (NULL == buf)
606 goto done;
607 MAGIC_CHECK(buf->magic,MAGIC_BUFFER);
608 if (buf->memory != b->memory)
609 goto done;
610 if (buf->state == STATE_QUEUED ||
611 buf->state == STATE_ACTIVE)
612 goto done;
613
614 if (b->flags & V4L2_BUF_FLAG_INPUT) {
615 if (b->input >= q->inputs)
616 goto done;
617 buf->input = b->input;
618 } else {
619 buf->input = UNSET;
620 }
621
622 switch (b->memory) {
623 case V4L2_MEMORY_MMAP:
624 if (0 == buf->baddr)
625 goto done;
626 break;
627 case V4L2_MEMORY_USERPTR:
628 if (b->length < buf->bsize)
629 goto done;
630 if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr)
631 q->ops->buf_release(q,buf);
632 buf->baddr = b->m.userptr;
633 break;
634 case V4L2_MEMORY_OVERLAY:
635 buf->boff = b->m.offset;
636 break;
637 default:
638 goto done;
639 }
640
641 field = videobuf_next_field(q);
642 retval = q->ops->buf_prepare(q,buf,field);
643 if (0 != retval)
644 goto done;
645
646 list_add_tail(&buf->stream,&q->stream);
647 if (q->streaming) {
648 spin_lock_irqsave(q->irqlock,flags);
649 q->ops->buf_queue(q,buf);
650 spin_unlock_irqrestore(q->irqlock,flags);
651 }
652 retval = 0;
653
654 done:
655 up(&q->lock);
656 return retval;
657 }
658
659 int
660 videobuf_dqbuf(struct videobuf_queue *q,
661 struct v4l2_buffer *b, int nonblocking)
662 {
663 struct videobuf_buffer *buf;
664 int retval;
665
666 down(&q->lock);
667 retval = -EBUSY;
668 if (q->reading)
669 goto done;
670 retval = -EINVAL;
671 if (b->type != q->type)
672 goto done;
673 if (list_empty(&q->stream))
674 goto done;
675 buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
676 retval = videobuf_waiton(buf, nonblocking, 1);
677 if (retval < 0)
678 goto done;
679 switch (buf->state) {
680 case STATE_ERROR:
681 retval = -EIO;
682 /* fall through */
683 case STATE_DONE:
684 videobuf_dma_pci_sync(q->pci,&buf->dma);
685 buf->state = STATE_IDLE;
686 break;
687 default:
688 retval = -EINVAL;
689 goto done;
690 }
691 list_del(&buf->stream);
692 memset(b,0,sizeof(*b));
693 videobuf_status(b,buf,q->type);
694
695 done:
696 up(&q->lock);
697 return retval;
698 }
699
700 int videobuf_streamon(struct videobuf_queue *q)
701 {
702 struct videobuf_buffer *buf;
703 struct list_head *list;
704 unsigned long flags;
705 int retval;
706
707 down(&q->lock);
708 retval = -EBUSY;
709 if (q->reading)
710 goto done;
711 retval = 0;
712 if (q->streaming)
713 goto done;
714 q->streaming = 1;
715 spin_lock_irqsave(q->irqlock,flags);
716 list_for_each(list,&q->stream) {
717 buf = list_entry(list, struct videobuf_buffer, stream);
718 if (buf->state == STATE_PREPARED)
719 q->ops->buf_queue(q,buf);
720 }
721 spin_unlock_irqrestore(q->irqlock,flags);
722
723 done:
724 up(&q->lock);
725 return retval;
726 }
727
728 int videobuf_streamoff(struct videobuf_queue *q)
729 {
730 int retval = -EINVAL;
731
732 down(&q->lock);
733 if (!q->streaming)
734 goto done;
735 videobuf_queue_cancel(q);
736 q->streaming = 0;
737 retval = 0;
738
739 done:
740 up(&q->lock);
741 return retval;
742 }
743
744 static ssize_t
745 videobuf_read_zerocopy(struct videobuf_queue *q, char __user *data,
746 size_t count, loff_t *ppos)
747 {
748 enum v4l2_field field;
749 unsigned long flags;
750 int retval;
751
752 /* setup stuff */
753 q->read_buf = videobuf_alloc(q->msize);
754 if (NULL == q->read_buf)
755 return -ENOMEM;
756
757 q->read_buf->memory = V4L2_MEMORY_USERPTR;
758 q->read_buf->baddr = (unsigned long)data;
759 q->read_buf->bsize = count;
760 field = videobuf_next_field(q);
761 retval = q->ops->buf_prepare(q,q->read_buf,field);
762 if (0 != retval)
763 goto done;
764
765 /* start capture & wait */
766 spin_lock_irqsave(q->irqlock,flags);
767 q->ops->buf_queue(q,q->read_buf);
768 spin_unlock_irqrestore(q->irqlock,flags);
769 retval = videobuf_waiton(q->read_buf,0,0);
770 if (0 == retval) {
771 videobuf_dma_pci_sync(q->pci,&q->read_buf->dma);
772 if (STATE_ERROR == q->read_buf->state)
773 retval = -EIO;
774 else
775 retval = q->read_buf->size;
776 }
777
778 done:
779 /* cleanup */
780 q->ops->buf_release(q,q->read_buf);
781 kfree(q->read_buf);
782 q->read_buf = NULL;
783 return retval;
784 }
785
786 ssize_t videobuf_read_one(struct videobuf_queue *q,
787 char __user *data, size_t count, loff_t *ppos,
788 int nonblocking)
789 {
790 enum v4l2_field field;
791 unsigned long flags;
792 unsigned size, nbufs, bytes;
793 int retval;
794
795 down(&q->lock);
796
797 nbufs = 1; size = 0;
798 q->ops->buf_setup(q,&nbufs,&size);
799 if (NULL == q->read_buf &&
800 count >= size &&
801 !nonblocking) {
802 retval = videobuf_read_zerocopy(q,data,count,ppos);
803 if (retval >= 0 || retval == -EIO)
804 /* ok, all done */
805 goto done;
806 /* fallback to kernel bounce buffer on failures */
807 }
808
809 if (NULL == q->read_buf) {
810 /* need to capture a new frame */
811 retval = -ENOMEM;
812 q->read_buf = videobuf_alloc(q->msize);
813 if (NULL == q->read_buf)
814 goto done;
815 q->read_buf->memory = V4L2_MEMORY_USERPTR;
816 q->read_buf->bsize = count; /* preferred size */
817 field = videobuf_next_field(q);
818 retval = q->ops->buf_prepare(q,q->read_buf,field);
819 if (0 != retval) {
820 kfree (q->read_buf);
821 q->read_buf = NULL;
822 goto done;
823 }
824 spin_lock_irqsave(q->irqlock,flags);
825 q->ops->buf_queue(q,q->read_buf);
826 spin_unlock_irqrestore(q->irqlock,flags);
827 q->read_off = 0;
828 }
829
830 /* wait until capture is done */
831 retval = videobuf_waiton(q->read_buf, nonblocking, 1);
832 if (0 != retval)
833 goto done;
834 videobuf_dma_pci_sync(q->pci,&q->read_buf->dma);
835
836 if (STATE_ERROR == q->read_buf->state) {
837 /* catch I/O errors */
838 q->ops->buf_release(q,q->read_buf);
839 kfree(q->read_buf);
840 q->read_buf = NULL;
841 retval = -EIO;
842 goto done;
843 }
844
845 /* copy to userspace */
846 bytes = count;
847 if (bytes > q->read_buf->size - q->read_off)
848 bytes = q->read_buf->size - q->read_off;
849 retval = -EFAULT;
850 if (copy_to_user(data, q->read_buf->dma.vmalloc+q->read_off, bytes))
851 goto done;
852
853 retval = bytes;
854 q->read_off += bytes;
855 if (q->read_off == q->read_buf->size) {
856 /* all data copied, cleanup */
857 q->ops->buf_release(q,q->read_buf);
858 kfree(q->read_buf);
859 q->read_buf = NULL;
860 }
861
862 done:
863 up(&q->lock);
864 return retval;
865 }
866
867 int videobuf_read_start(struct videobuf_queue *q)
868 {
869 enum v4l2_field field;
870 unsigned long flags;
871 int count = 0, size = 0;
872 int err, i;
873
874 q->ops->buf_setup(q,&count,&size);
875 if (count < 2)
876 count = 2;
877 if (count > VIDEO_MAX_FRAME)
878 count = VIDEO_MAX_FRAME;
879 size = PAGE_ALIGN(size);
880
881 err = videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR);
882 if (err)
883 return err;
884 for (i = 0; i < count; i++) {
885 field = videobuf_next_field(q);
886 err = q->ops->buf_prepare(q,q->bufs[i],field);
887 if (err)
888 return err;
889 list_add_tail(&q->bufs[i]->stream, &q->stream);
890 }
891 spin_lock_irqsave(q->irqlock,flags);
892 for (i = 0; i < count; i++)
893 q->ops->buf_queue(q,q->bufs[i]);
894 spin_unlock_irqrestore(q->irqlock,flags);
895 q->reading = 1;
896 return 0;
897 }
898
899 void videobuf_read_stop(struct videobuf_queue *q)
900 {
901 int i;
902
903 videobuf_queue_cancel(q);
904 videobuf_mmap_free(q);
905 INIT_LIST_HEAD(&q->stream);
906 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
907 if (NULL == q->bufs[i])
908 continue;
909 kfree(q->bufs[i]);
910 q->bufs[i] = NULL;
911 }
912 q->read_buf = NULL;
913 q->reading = 0;
914 }
915
916 ssize_t videobuf_read_stream(struct videobuf_queue *q,
917 char __user *data, size_t count, loff_t *ppos,
918 int vbihack, int nonblocking)
919 {
920 unsigned int *fc, bytes;
921 int err, retval;
922 unsigned long flags;
923
924 dprintk(2,"%s\n",__FUNCTION__);
925 down(&q->lock);
926 retval = -EBUSY;
927 if (q->streaming)
928 goto done;
929 if (!q->reading) {
930 retval = videobuf_read_start(q);
931 if (retval < 0)
932 goto done;
933 }
934
935 retval = 0;
936 while (count > 0) {
937 /* get / wait for data */
938 if (NULL == q->read_buf) {
939 q->read_buf = list_entry(q->stream.next,
940 struct videobuf_buffer,
941 stream);
942 list_del(&q->read_buf->stream);
943 q->read_off = 0;
944 }
945 err = videobuf_waiton(q->read_buf, nonblocking, 1);
946 if (err < 0) {
947 if (0 == retval)
948 retval = err;
949 break;
950 }
951
952 if (q->read_buf->state == STATE_DONE) {
953 if (vbihack) {
954 /* dirty, undocumented hack -- pass the frame counter
955 * within the last four bytes of each vbi data block.
956 * We need that one to maintain backward compatibility
957 * to all vbi decoding software out there ... */
958 fc = (unsigned int*)q->read_buf->dma.vmalloc;
959 fc += (q->read_buf->size>>2) -1;
960 *fc = q->read_buf->field_count >> 1;
961 dprintk(1,"vbihack: %d\n",*fc);
962 }
963
964 /* copy stuff */
965 bytes = count;
966 if (bytes > q->read_buf->size - q->read_off)
967 bytes = q->read_buf->size - q->read_off;
968 if (copy_to_user(data + retval,
969 q->read_buf->dma.vmalloc + q->read_off,
970 bytes)) {
971 if (0 == retval)
972 retval = -EFAULT;
973 break;
974 }
975 count -= bytes;
976 retval += bytes;
977 q->read_off += bytes;
978 } else {
979 /* some error */
980 q->read_off = q->read_buf->size;
981 if (0 == retval)
982 retval = -EIO;
983 }
984
985 /* requeue buffer when done with copying */
986 if (q->read_off == q->read_buf->size) {
987 list_add_tail(&q->read_buf->stream,
988 &q->stream);
989 spin_lock_irqsave(q->irqlock,flags);
990 q->ops->buf_queue(q,q->read_buf);
991 spin_unlock_irqrestore(q->irqlock,flags);
992 q->read_buf = NULL;
993 }
994 if (retval < 0)
995 break;
996 }
997
998 done:
999 up(&q->lock);
1000 return retval;
1001 }
1002
1003 unsigned int videobuf_poll_stream(struct file *file,
1004 struct videobuf_queue *q,
1005 poll_table *wait)
1006 {
1007 struct videobuf_buffer *buf = NULL;
1008 unsigned int rc = 0;
1009
1010 down(&q->lock);
1011 if (q->streaming) {
1012 if (!list_empty(&q->stream))
1013 buf = list_entry(q->stream.next,
1014 struct videobuf_buffer, stream);
1015 } else {
1016 if (!q->reading)
1017 videobuf_read_start(q);
1018 if (!q->reading) {
1019 rc = POLLERR;
1020 } else if (NULL == q->read_buf) {
1021 q->read_buf = list_entry(q->stream.next,
1022 struct videobuf_buffer,
1023 stream);
1024 list_del(&q->read_buf->stream);
1025 q->read_off = 0;
1026 }
1027 buf = q->read_buf;
1028 }
1029 if (!buf)
1030 rc = POLLERR;
1031
1032 if (0 == rc) {
1033 poll_wait(file, &buf->done, wait);
1034 if (buf->state == STATE_DONE ||
1035 buf->state == STATE_ERROR)
1036 rc = POLLIN|POLLRDNORM;
1037 }
1038 up(&q->lock);
1039 return rc;
1040 }
1041
1042 /* --------------------------------------------------------------------- */
1043
1044 static void
1045 videobuf_vm_open(struct vm_area_struct *vma)
1046 {
1047 struct videobuf_mapping *map = vma->vm_private_data;
1048
1049 dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
1050 map->count,vma->vm_start,vma->vm_end);
1051 map->count++;
1052 }
1053
1054 static void
1055 videobuf_vm_close(struct vm_area_struct *vma)
1056 {
1057 struct videobuf_mapping *map = vma->vm_private_data;
1058 struct videobuf_queue *q = map->q;
1059 int i;
1060
1061 dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
1062 map->count,vma->vm_start,vma->vm_end);
1063
1064 map->count--;
1065 if (0 == map->count) {
1066 dprintk(1,"munmap %p q=%p\n",map,q);
1067 down(&q->lock);
1068 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1069 if (NULL == q->bufs[i])
1070 continue;
1071 if (q->bufs[i])
1072 ;
1073 if (q->bufs[i]->map != map)
1074 continue;
1075 q->bufs[i]->map = NULL;
1076 q->bufs[i]->baddr = 0;
1077 q->ops->buf_release(q,q->bufs[i]);
1078 }
1079 up(&q->lock);
1080 kfree(map);
1081 }
1082 return;
1083 }
1084
1085 /*
1086 * Get a anonymous page for the mapping. Make sure we can DMA to that
1087 * memory location with 32bit PCI devices (i.e. don't use highmem for
1088 * now ...). Bounce buffers don't work very well for the data rates
1089 * video capture has.
1090 */
1091 static struct page*
1092 videobuf_vm_nopage(struct vm_area_struct *vma, unsigned long vaddr,
1093 int *type)
1094 {
1095 struct page *page;
1096
1097 dprintk(3,"nopage: fault @ %08lx [vma %08lx-%08lx]\n",
1098 vaddr,vma->vm_start,vma->vm_end);
1099 if (vaddr > vma->vm_end)
1100 return NOPAGE_SIGBUS;
1101 page = alloc_page(GFP_USER);
1102 if (!page)
1103 return NOPAGE_OOM;
1104 clear_user_page(page_address(page), vaddr, page);
1105 if (type)
1106 *type = VM_FAULT_MINOR;
1107 return page;
1108 }
1109
1110 static struct vm_operations_struct videobuf_vm_ops =
1111 {
1112 .open = videobuf_vm_open,
1113 .close = videobuf_vm_close,
1114 .nopage = videobuf_vm_nopage,
1115 };
1116
1117 int videobuf_mmap_setup(struct videobuf_queue *q,
1118 unsigned int bcount, unsigned int bsize,
1119 enum v4l2_memory memory)
1120 {
1121 unsigned int i;
1122 int err;
1123
1124 err = videobuf_mmap_free(q);
1125 if (0 != err)
1126 return err;
1127
1128 for (i = 0; i < bcount; i++) {
1129 q->bufs[i] = videobuf_alloc(q->msize);
1130 q->bufs[i]->i = i;
1131 q->bufs[i]->input = UNSET;
1132 q->bufs[i]->memory = memory;
1133 q->bufs[i]->bsize = bsize;
1134 switch (memory) {
1135 case V4L2_MEMORY_MMAP:
1136 q->bufs[i]->boff = bsize * i;
1137 break;
1138 case V4L2_MEMORY_USERPTR:
1139 case V4L2_MEMORY_OVERLAY:
1140 /* nothing */
1141 break;
1142 }
1143 }
1144 dprintk(1,"mmap setup: %d buffers, %d bytes each\n",
1145 bcount,bsize);
1146 return 0;
1147 }
1148
1149 int videobuf_mmap_free(struct videobuf_queue *q)
1150 {
1151 int i;
1152
1153 for (i = 0; i < VIDEO_MAX_FRAME; i++)
1154 if (q->bufs[i] && q->bufs[i]->map)
1155 return -EBUSY;
1156 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1157 if (NULL == q->bufs[i])
1158 continue;
1159 q->ops->buf_release(q,q->bufs[i]);
1160 kfree(q->bufs[i]);
1161 q->bufs[i] = NULL;
1162 }
1163 return 0;
1164 }
1165
1166 int videobuf_mmap_mapper(struct videobuf_queue *q,
1167 struct vm_area_struct *vma)
1168 {
1169 struct videobuf_mapping *map;
1170 unsigned int first,last,size,i;
1171 int retval;
1172
1173 down(&q->lock);
1174 retval = -EINVAL;
1175 if (!(vma->vm_flags & VM_WRITE)) {
1176 dprintk(1,"mmap app bug: PROT_WRITE please\n");
1177 goto done;
1178 }
1179 if (!(vma->vm_flags & VM_SHARED)) {
1180 dprintk(1,"mmap app bug: MAP_SHARED please\n");
1181 goto done;
1182 }
1183
1184 /* look for first buffer to map */
1185 for (first = 0; first < VIDEO_MAX_FRAME; first++) {
1186 if (NULL == q->bufs[first])
1187 continue;
1188 if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
1189 continue;
1190 if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
1191 break;
1192 }
1193 if (VIDEO_MAX_FRAME == first) {
1194 dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
1195 (vma->vm_pgoff << PAGE_SHIFT));
1196 goto done;
1197 }
1198
1199 /* look for last buffer to map */
1200 for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
1201 if (NULL == q->bufs[last])
1202 continue;
1203 if (V4L2_MEMORY_MMAP != q->bufs[last]->memory)
1204 continue;
1205 if (q->bufs[last]->map) {
1206 retval = -EBUSY;
1207 goto done;
1208 }
1209 size += q->bufs[last]->bsize;
1210 if (size == (vma->vm_end - vma->vm_start))
1211 break;
1212 }
1213 if (VIDEO_MAX_FRAME == last) {
1214 dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n",
1215 (vma->vm_end - vma->vm_start));
1216 goto done;
1217 }
1218
1219 /* create mapping + update buffer list */
1220 retval = -ENOMEM;
1221 map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
1222 if (NULL == map)
1223 goto done;
1224 for (size = 0, i = first; i <= last; size += q->bufs[i++]->bsize) {
1225 q->bufs[i]->map = map;
1226 q->bufs[i]->baddr = vma->vm_start + size;
1227 }
1228 map->count = 1;
1229 map->start = vma->vm_start;
1230 map->end = vma->vm_end;
1231 map->q = q;
1232 vma->vm_ops = &videobuf_vm_ops;
1233 vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
1234 vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
1235 vma->vm_private_data = map;
1236 dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n",
1237 map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
1238 retval = 0;
1239
1240 done:
1241 up(&q->lock);
1242 return retval;
1243 }
1244
1245 /* --------------------------------------------------------------------- */
1246
1247 EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
1248
1249 EXPORT_SYMBOL_GPL(videobuf_dma_init);
1250 EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
1251 EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
1252 EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
1253 EXPORT_SYMBOL_GPL(videobuf_dma_pci_map);
1254 EXPORT_SYMBOL_GPL(videobuf_dma_pci_sync);
1255 EXPORT_SYMBOL_GPL(videobuf_dma_pci_unmap);
1256 EXPORT_SYMBOL_GPL(videobuf_dma_free);
1257
1258 EXPORT_SYMBOL_GPL(videobuf_alloc);
1259 EXPORT_SYMBOL_GPL(videobuf_waiton);
1260 EXPORT_SYMBOL_GPL(videobuf_iolock);
1261
1262 EXPORT_SYMBOL_GPL(videobuf_queue_init);
1263 EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
1264 EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
1265
1266 EXPORT_SYMBOL_GPL(videobuf_next_field);
1267 EXPORT_SYMBOL_GPL(videobuf_status);
1268 EXPORT_SYMBOL_GPL(videobuf_reqbufs);
1269 EXPORT_SYMBOL_GPL(videobuf_querybuf);
1270 EXPORT_SYMBOL_GPL(videobuf_qbuf);
1271 EXPORT_SYMBOL_GPL(videobuf_dqbuf);
1272 EXPORT_SYMBOL_GPL(videobuf_streamon);
1273 EXPORT_SYMBOL_GPL(videobuf_streamoff);
1274
1275 EXPORT_SYMBOL_GPL(videobuf_read_start);
1276 EXPORT_SYMBOL_GPL(videobuf_read_stop);
1277 EXPORT_SYMBOL_GPL(videobuf_read_stream);
1278 EXPORT_SYMBOL_GPL(videobuf_read_one);
1279 EXPORT_SYMBOL_GPL(videobuf_poll_stream);
1280
1281 EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
1282 EXPORT_SYMBOL_GPL(videobuf_mmap_free);
1283 EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);
1284
1285 /*
1286 * Local variables:
1287 * c-basic-offset: 8
1288 * End:
1289 */
kernel source for telekom puls (alcatel/mediatek)