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-rw-r--r--drivers/media/video/videobuf-core.c976
-rw-r--r--drivers/media/video/videobuf-dma-sg.c772
-rw-r--r--include/media/videobuf-core.h236
-rw-r--r--include/media/videobuf-dma-sg.h142
4 files changed, 2126 insertions, 0 deletions
diff --git a/drivers/media/video/videobuf-core.c b/drivers/media/video/videobuf-core.c
new file mode 100644
index 000000000000..256501384af7
--- /dev/null
+++ b/drivers/media/video/videobuf-core.c
@@ -0,0 +1,976 @@
1/*
2 * generic helper functions for handling video4linux capture buffers
3 *
4 * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
5 *
6 * Highly based on video-buf written originally by:
7 * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
8 * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org>
9 * (c) 2006 Ted Walther and John Sokol
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2
14 */
15
16#include <linux/init.h>
17#include <linux/module.h>
18#include <linux/moduleparam.h>
19#include <linux/slab.h>
20#include <linux/interrupt.h>
21
22#include <media/videobuf-core.h>
23
24#define MAGIC_BUFFER 0x20070728
25#define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \
26 { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }
27
28static int debug = 0;
29module_param(debug, int, 0644);
30
31MODULE_DESCRIPTION("helper module to manage video4linux buffers");
32MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
33MODULE_LICENSE("GPL");
34
35#define dprintk(level, fmt, arg...) if (debug >= level) \
36 printk(KERN_DEBUG "vbuf: " fmt , ## arg)
37
38/* --------------------------------------------------------------------- */
39
40#define CALL(q, f, arg...) \
41 ( (q->int_ops->f)? q->int_ops->f(arg) : 0)
42
43void* videobuf_alloc(struct videobuf_queue* q)
44{
45 struct videobuf_buffer *vb;
46
47 BUG_ON (q->msize<sizeof(*vb));
48
49 if (!q->int_ops || !q->int_ops->alloc) {
50 printk(KERN_ERR "No specific ops defined!\n");
51 BUG();
52 }
53
54 vb = q->int_ops->alloc(q->msize);
55
56 if (NULL != vb) {
57 init_waitqueue_head(&vb->done);
58 vb->magic = MAGIC_BUFFER;
59 }
60
61 return vb;
62}
63
64int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr)
65{
66 int retval = 0;
67 DECLARE_WAITQUEUE(wait, current);
68
69 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
70 add_wait_queue(&vb->done, &wait);
71 while (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) {
72 if (non_blocking) {
73 retval = -EAGAIN;
74 break;
75 }
76 set_current_state(intr ? TASK_INTERRUPTIBLE
77 : TASK_UNINTERRUPTIBLE);
78 if (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED)
79 schedule();
80 set_current_state(TASK_RUNNING);
81 if (intr && signal_pending(current)) {
82 dprintk(1,"buffer waiton: -EINTR\n");
83 retval = -EINTR;
84 break;
85 }
86 }
87 remove_wait_queue(&vb->done, &wait);
88 return retval;
89}
90
91int videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb,
92 struct v4l2_framebuffer *fbuf)
93{
94 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
95 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
96
97 return CALL(q,iolock,q,vb,fbuf);
98}
99
100/* --------------------------------------------------------------------- */
101
102
103void videobuf_queue_init(struct videobuf_queue* q,
104 struct videobuf_queue_ops *ops,
105 void *dev,
106 spinlock_t *irqlock,
107 enum v4l2_buf_type type,
108 enum v4l2_field field,
109 unsigned int msize,
110 void *priv)
111{
112 memset(q,0,sizeof(*q));
113 q->irqlock = irqlock;
114 q->dev = dev;
115 q->type = type;
116 q->field = field;
117 q->msize = msize;
118 q->ops = ops;
119 q->priv_data = priv;
120
121 /* All buffer operations are mandatory */
122 BUG_ON (!q->ops->buf_setup);
123 BUG_ON (!q->ops->buf_prepare);
124 BUG_ON (!q->ops->buf_queue);
125 BUG_ON (!q->ops->buf_release);
126
127 mutex_init(&q->lock);
128 INIT_LIST_HEAD(&q->stream);
129}
130
131int videobuf_queue_is_busy(struct videobuf_queue *q)
132{
133 int i;
134
135 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
136
137 if (q->streaming) {
138 dprintk(1,"busy: streaming active\n");
139 return 1;
140 }
141 if (q->reading) {
142 dprintk(1,"busy: pending read #1\n");
143 return 1;
144 }
145 if (q->read_buf) {
146 dprintk(1,"busy: pending read #2\n");
147 return 1;
148 }
149 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
150 if (NULL == q->bufs[i])
151 continue;
152 if (CALL(q,is_mmapped,q->bufs[i])) {
153 dprintk(1,"busy: buffer #%d mapped\n",i);
154 return 1;
155 }
156 if (q->bufs[i]->state == STATE_QUEUED) {
157 dprintk(1,"busy: buffer #%d queued\n",i);
158 return 1;
159 }
160 if (q->bufs[i]->state == STATE_ACTIVE) {
161 dprintk(1,"busy: buffer #%d avtive\n",i);
162 return 1;
163 }
164 }
165 return 0;
166}
167
168void videobuf_queue_cancel(struct videobuf_queue *q)
169{
170 unsigned long flags=0;
171 int i;
172
173 /* remove queued buffers from list */
174 if (q->irqlock)
175 spin_lock_irqsave(q->irqlock,flags);
176 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
177 if (NULL == q->bufs[i])
178 continue;
179 if (q->bufs[i]->state == STATE_QUEUED) {
180 list_del(&q->bufs[i]->queue);
181 q->bufs[i]->state = STATE_ERROR;
182 }
183 }
184 if (q->irqlock)
185 spin_unlock_irqrestore(q->irqlock,flags);
186
187 /* free all buffers + clear queue */
188 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
189 if (NULL == q->bufs[i])
190 continue;
191 q->ops->buf_release(q,q->bufs[i]);
192 }
193 INIT_LIST_HEAD(&q->stream);
194}
195
196/* --------------------------------------------------------------------- */
197
198enum v4l2_field videobuf_next_field(struct videobuf_queue *q)
199{
200 enum v4l2_field field = q->field;
201
202 BUG_ON(V4L2_FIELD_ANY == field);
203
204 if (V4L2_FIELD_ALTERNATE == field) {
205 if (V4L2_FIELD_TOP == q->last) {
206 field = V4L2_FIELD_BOTTOM;
207 q->last = V4L2_FIELD_BOTTOM;
208 } else {
209 field = V4L2_FIELD_TOP;
210 q->last = V4L2_FIELD_TOP;
211 }
212 }
213 return field;
214}
215
216static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b,
217 struct videobuf_buffer *vb, enum v4l2_buf_type type)
218{
219 MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
220 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
221
222 b->index = vb->i;
223 b->type = type;
224
225 b->memory = vb->memory;
226 switch (b->memory) {
227 case V4L2_MEMORY_MMAP:
228 b->m.offset = vb->boff;
229 b->length = vb->bsize;
230 break;
231 case V4L2_MEMORY_USERPTR:
232 b->m.userptr = vb->baddr;
233 b->length = vb->bsize;
234 break;
235 case V4L2_MEMORY_OVERLAY:
236 b->m.offset = vb->boff;
237 break;
238 }
239
240 b->flags = 0;
241 if (CALL(q,is_mmapped,vb))
242 b->flags |= V4L2_BUF_FLAG_MAPPED;
243
244 switch (vb->state) {
245 case STATE_PREPARED:
246 case STATE_QUEUED:
247 case STATE_ACTIVE:
248 b->flags |= V4L2_BUF_FLAG_QUEUED;
249 break;
250 case STATE_DONE:
251 case STATE_ERROR:
252 b->flags |= V4L2_BUF_FLAG_DONE;
253 break;
254 case STATE_NEEDS_INIT:
255 case STATE_IDLE:
256 /* nothing */
257 break;
258 }
259
260 if (vb->input != UNSET) {
261 b->flags |= V4L2_BUF_FLAG_INPUT;
262 b->input = vb->input;
263 }
264
265 b->field = vb->field;
266 b->timestamp = vb->ts;
267 b->bytesused = vb->size;
268 b->sequence = vb->field_count >> 1;
269}
270
271int videobuf_reqbufs(struct videobuf_queue *q,
272 struct v4l2_requestbuffers *req)
273{
274 unsigned int size,count;
275 int retval;
276
277 if (req->type != q->type) {
278 dprintk(1,"reqbufs: queue type invalid\n");
279 return -EINVAL;
280 }
281 if (req->count < 1) {
282 dprintk(1,"reqbufs: count invalid (%d)\n",req->count);
283 return -EINVAL;
284 }
285 if (req->memory != V4L2_MEMORY_MMAP &&
286 req->memory != V4L2_MEMORY_USERPTR &&
287 req->memory != V4L2_MEMORY_OVERLAY) {
288 dprintk(1,"reqbufs: memory type invalid\n");
289 return -EINVAL;
290 }
291
292 if (q->streaming) {
293 dprintk(1,"reqbufs: streaming already exists\n");
294 return -EBUSY;
295 }
296 if (!list_empty(&q->stream)) {
297 dprintk(1,"reqbufs: stream running\n");
298 return -EBUSY;
299 }
300
301 mutex_lock(&q->lock);
302 count = req->count;
303 if (count > VIDEO_MAX_FRAME)
304 count = VIDEO_MAX_FRAME;
305 size = 0;
306 q->ops->buf_setup(q,&count,&size);
307 size = PAGE_ALIGN(size);
308 dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n",
309 count, size, (count*size)>>PAGE_SHIFT);
310
311 retval = videobuf_mmap_setup(q,count,size,req->memory);
312 if (retval < 0) {
313 dprintk(1,"reqbufs: mmap setup returned %d\n",retval);
314 goto done;
315 }
316
317 req->count = count;
318
319 done:
320 mutex_unlock(&q->lock);
321 return retval;
322}
323
324int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
325{
326 if (unlikely(b->type != q->type)) {
327 dprintk(1,"querybuf: Wrong type.\n");
328 return -EINVAL;
329 }
330 if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) {
331 dprintk(1,"querybuf: index out of range.\n");
332 return -EINVAL;
333 }
334 if (unlikely(NULL == q->bufs[b->index])) {
335 dprintk(1,"querybuf: buffer is null.\n");
336 return -EINVAL;
337 }
338 videobuf_status(q,b,q->bufs[b->index],q->type);
339 return 0;
340}
341
342int videobuf_qbuf(struct videobuf_queue *q,
343 struct v4l2_buffer *b)
344{
345 struct videobuf_buffer *buf;
346 enum v4l2_field field;
347 unsigned long flags=0;
348 int retval;
349
350 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
351
352 mutex_lock(&q->lock);
353 retval = -EBUSY;
354 if (q->reading) {
355 dprintk(1,"qbuf: Reading running...\n");
356 goto done;
357 }
358 retval = -EINVAL;
359 if (b->type != q->type) {
360 dprintk(1,"qbuf: Wrong type.\n");
361 goto done;
362 }
363 if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) {
364 dprintk(1,"qbuf: index out of range.\n");
365 goto done;
366 }
367 buf = q->bufs[b->index];
368 if (NULL == buf) {
369 dprintk(1,"qbuf: buffer is null.\n");
370 goto done;
371 }
372 MAGIC_CHECK(buf->magic,MAGIC_BUFFER);
373 if (buf->memory != b->memory) {
374 dprintk(1,"qbuf: memory type is wrong.\n");
375 goto done;
376 }
377 if (buf->state != STATE_NEEDS_INIT && buf->state != STATE_IDLE) {
378 dprintk(1,"qbuf: buffer is already queued or active.\n");
379 goto done;
380 }
381
382 if (b->flags & V4L2_BUF_FLAG_INPUT) {
383 if (b->input >= q->inputs) {
384 dprintk(1,"qbuf: wrong input.\n");
385 goto done;
386 }
387 buf->input = b->input;
388 } else {
389 buf->input = UNSET;
390 }
391
392 switch (b->memory) {
393 case V4L2_MEMORY_MMAP:
394 if (0 == buf->baddr) {
395 dprintk(1,"qbuf: mmap requested but buffer addr is zero!\n");
396 goto done;
397 }
398 break;
399 case V4L2_MEMORY_USERPTR:
400 if (b->length < buf->bsize) {
401 dprintk(1,"qbuf: buffer length is not enough\n");
402 goto done;
403 }
404 if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr)
405 q->ops->buf_release(q,buf);
406 buf->baddr = b->m.userptr;
407 break;
408 case V4L2_MEMORY_OVERLAY:
409 buf->boff = b->m.offset;
410 break;
411 default:
412 dprintk(1,"qbuf: wrong memory type\n");
413 goto done;
414 }
415
416 dprintk(1,"qbuf: requesting next field\n");
417 field = videobuf_next_field(q);
418 retval = q->ops->buf_prepare(q,buf,field);
419 if (0 != retval) {
420 dprintk(1,"qbuf: buffer_prepare returned %d\n",retval);
421 goto done;
422 }
423
424 list_add_tail(&buf->stream,&q->stream);
425 if (q->streaming) {
426 if (q->irqlock)
427 spin_lock_irqsave(q->irqlock,flags);
428 q->ops->buf_queue(q,buf);
429 if (q->irqlock)
430 spin_unlock_irqrestore(q->irqlock,flags);
431 }
432 dprintk(1,"qbuf: succeded\n");
433 retval = 0;
434
435 done:
436 mutex_unlock(&q->lock);
437 return retval;
438}
439
440int videobuf_dqbuf(struct videobuf_queue *q,
441 struct v4l2_buffer *b, int nonblocking)
442{
443 struct videobuf_buffer *buf;
444 int retval;
445
446 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
447
448 mutex_lock(&q->lock);
449 retval = -EBUSY;
450 if (q->reading) {
451 dprintk(1,"dqbuf: Reading running...\n");
452 goto done;
453 }
454 retval = -EINVAL;
455 if (b->type != q->type) {
456 dprintk(1,"dqbuf: Wrong type.\n");
457 goto done;
458 }
459 if (list_empty(&q->stream)) {
460 dprintk(1,"dqbuf: stream running\n");
461 goto done;
462 }
463 buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
464 retval = videobuf_waiton(buf, nonblocking, 1);
465 if (retval < 0) {
466 dprintk(1,"dqbuf: waiton returned %d\n",retval);
467 goto done;
468 }
469 switch (buf->state) {
470 case STATE_ERROR:
471 dprintk(1,"dqbuf: state is error\n");
472 retval = -EIO;
473 CALL(q,sync,q, buf);
474 buf->state = STATE_IDLE;
475 break;
476 case STATE_DONE:
477 dprintk(1,"dqbuf: state is done\n");
478 CALL(q,sync,q, buf);
479 buf->state = STATE_IDLE;
480 break;
481 default:
482 dprintk(1,"dqbuf: state invalid\n");
483 retval = -EINVAL;
484 goto done;
485 }
486 list_del(&buf->stream);
487 memset(b,0,sizeof(*b));
488 videobuf_status(q,b,buf,q->type);
489
490 done:
491 mutex_unlock(&q->lock);
492 return retval;
493}
494
495int videobuf_streamon(struct videobuf_queue *q)
496{
497 struct videobuf_buffer *buf;
498 struct list_head *list;
499 unsigned long flags=0;
500 int retval;
501
502 mutex_lock(&q->lock);
503 retval = -EBUSY;
504 if (q->reading)
505 goto done;
506 retval = 0;
507 if (q->streaming)
508 goto done;
509 q->streaming = 1;
510 if (q->irqlock)
511 spin_lock_irqsave(q->irqlock,flags);
512 list_for_each(list,&q->stream) {
513 buf = list_entry(list, struct videobuf_buffer, stream);
514 if (buf->state == STATE_PREPARED)
515 q->ops->buf_queue(q,buf);
516 }
517 if (q->irqlock)
518 spin_unlock_irqrestore(q->irqlock,flags);
519
520 done:
521 mutex_unlock(&q->lock);
522 return retval;
523}
524
525int videobuf_streamoff(struct videobuf_queue *q)
526{
527 int retval = -EINVAL;
528
529 mutex_lock(&q->lock);
530 if (!q->streaming)
531 goto done;
532 videobuf_queue_cancel(q);
533 q->streaming = 0;
534 retval = 0;
535
536 done:
537 mutex_unlock(&q->lock);
538 return retval;
539}
540
541static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q,
542 char __user *data,
543 size_t count, loff_t *ppos)
544{
545 enum v4l2_field field;
546 unsigned long flags=0;
547 int retval;
548
549 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
550
551 /* setup stuff */
552 q->read_buf = videobuf_alloc(q);
553 if (NULL == q->read_buf)
554 return -ENOMEM;
555
556 q->read_buf->memory = V4L2_MEMORY_USERPTR;
557 q->read_buf->baddr = (unsigned long)data;
558 q->read_buf->bsize = count;
559
560 field = videobuf_next_field(q);
561 retval = q->ops->buf_prepare(q,q->read_buf,field);
562 if (0 != retval)
563 goto done;
564
565 /* start capture & wait */
566 if (q->irqlock)
567 spin_lock_irqsave(q->irqlock,flags);
568 q->ops->buf_queue(q,q->read_buf);
569 if (q->irqlock)
570 spin_unlock_irqrestore(q->irqlock,flags);
571 retval = videobuf_waiton(q->read_buf,0,0);
572 if (0 == retval) {
573 CALL(q,sync,q,q->read_buf);
574 if (STATE_ERROR == q->read_buf->state)
575 retval = -EIO;
576 else
577 retval = q->read_buf->size;
578 }
579
580 done:
581 /* cleanup */
582 q->ops->buf_release(q,q->read_buf);
583 kfree(q->read_buf);
584 q->read_buf = NULL;
585 return retval;
586}
587
588ssize_t videobuf_read_one(struct videobuf_queue *q,
589 char __user *data, size_t count, loff_t *ppos,
590 int nonblocking)
591{
592 enum v4l2_field field;
593 unsigned long flags=0;
594 unsigned size, nbufs;
595 int retval;
596
597 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
598
599 mutex_lock(&q->lock);
600
601 nbufs = 1; size = 0;
602 q->ops->buf_setup(q,&nbufs,&size);
603
604 if (NULL == q->read_buf &&
605 count >= size &&
606 !nonblocking) {
607 retval = videobuf_read_zerocopy(q,data,count,ppos);
608 if (retval >= 0 || retval == -EIO)
609 /* ok, all done */
610 goto done;
611 /* fallback to kernel bounce buffer on failures */
612 }
613
614 if (NULL == q->read_buf) {
615 /* need to capture a new frame */
616 retval = -ENOMEM;
617 q->read_buf = videobuf_alloc(q);
618
619 dprintk(1,"video alloc=0x%p\n", q->read_buf);
620 if (NULL == q->read_buf)
621 goto done;
622 q->read_buf->memory = V4L2_MEMORY_USERPTR;
623 q->read_buf->bsize = count; /* preferred size */
624 field = videobuf_next_field(q);
625 retval = q->ops->buf_prepare(q,q->read_buf,field);
626
627 if (0 != retval) {
628 kfree (q->read_buf);
629 q->read_buf = NULL;
630 goto done;
631 }
632 if (q->irqlock)
633 spin_lock_irqsave(q->irqlock,flags);
634
635 q->ops->buf_queue(q,q->read_buf);
636 if (q->irqlock)
637 spin_unlock_irqrestore(q->irqlock,flags);
638 q->read_off = 0;
639 }
640
641 /* wait until capture is done */
642 retval = videobuf_waiton(q->read_buf, nonblocking, 1);
643 if (0 != retval)
644 goto done;
645
646 CALL(q,sync,q,q->read_buf);
647
648 if (STATE_ERROR == q->read_buf->state) {
649 /* catch I/O errors */
650 q->ops->buf_release(q,q->read_buf);
651 kfree(q->read_buf);
652 q->read_buf = NULL;
653 retval = -EIO;
654 goto done;
655 }
656
657 /* Copy to userspace */
658 retval=CALL(q,copy_to_user,q,data,count,nonblocking);
659 if (retval<0)
660 goto done;
661
662 q->read_off += retval;
663 if (q->read_off == q->read_buf->size) {
664 /* all data copied, cleanup */
665 q->ops->buf_release(q,q->read_buf);
666 kfree(q->read_buf);
667 q->read_buf = NULL;
668 }
669
670 done:
671 mutex_unlock(&q->lock);
672 return retval;
673}
674
675int videobuf_read_start(struct videobuf_queue *q)
676{
677 enum v4l2_field field;
678 unsigned long flags=0;
679 int count = 0, size = 0;
680 int err, i;
681
682 q->ops->buf_setup(q,&count,&size);
683 if (count < 2)
684 count = 2;
685 if (count > VIDEO_MAX_FRAME)
686 count = VIDEO_MAX_FRAME;
687 size = PAGE_ALIGN(size);
688
689 err = videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR);
690 if (err)
691 return err;
692
693 for (i = 0; i < count; i++) {
694 field = videobuf_next_field(q);
695 err = q->ops->buf_prepare(q,q->bufs[i],field);
696 if (err)
697 return err;
698 list_add_tail(&q->bufs[i]->stream, &q->stream);
699 }
700 if (q->irqlock)
701 spin_lock_irqsave(q->irqlock,flags);
702 for (i = 0; i < count; i++)
703 q->ops->buf_queue(q,q->bufs[i]);
704 if (q->irqlock)
705 spin_unlock_irqrestore(q->irqlock,flags);
706 q->reading = 1;
707 return 0;
708}
709
710void videobuf_read_stop(struct videobuf_queue *q)
711{
712 int i;
713
714 videobuf_queue_cancel(q);
715 videobuf_mmap_free(q);
716 INIT_LIST_HEAD(&q->stream);
717 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
718 if (NULL == q->bufs[i])
719 continue;
720 kfree(q->bufs[i]);
721 q->bufs[i] = NULL;
722 }
723 q->read_buf = NULL;
724 q->reading = 0;
725}
726
727ssize_t videobuf_read_stream(struct videobuf_queue *q,
728 char __user *data, size_t count, loff_t *ppos,
729 int vbihack, int nonblocking)
730{
731 int rc, retval;
732 unsigned long flags=0;
733
734 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
735
736 dprintk(2,"%s\n",__FUNCTION__);
737 mutex_lock(&q->lock);
738 retval = -EBUSY;
739 if (q->streaming)
740 goto done;
741 if (!q->reading) {
742 retval = videobuf_read_start(q);
743 if (retval < 0)
744 goto done;
745 }
746
747 retval = 0;
748 while (count > 0) {
749 /* get / wait for data */
750 if (NULL == q->read_buf) {
751 q->read_buf = list_entry(q->stream.next,
752 struct videobuf_buffer,
753 stream);
754 list_del(&q->read_buf->stream);
755 q->read_off = 0;
756 }
757 rc = videobuf_waiton(q->read_buf, nonblocking, 1);
758 if (rc < 0) {
759 if (0 == retval)
760 retval = rc;
761 break;
762 }
763
764 if (q->read_buf->state == STATE_DONE) {
765 rc = CALL (q,copy_stream, q, data, count,
766 retval, vbihack, nonblocking);
767 if (rc < 0) {
768 retval = rc;
769 break;
770 }
771 retval += rc;
772 count -= rc;
773 q->read_off += rc;
774 } else {
775 /* some error */
776 q->read_off = q->read_buf->size;
777 if (0 == retval)
778 retval = -EIO;
779 }
780
781 /* requeue buffer when done with copying */
782 if (q->read_off == q->read_buf->size) {
783 list_add_tail(&q->read_buf->stream,
784 &q->stream);
785 if (q->irqlock)
786 spin_lock_irqsave(q->irqlock,flags);
787 q->ops->buf_queue(q,q->read_buf);
788 if (q->irqlock)
789 spin_unlock_irqrestore(q->irqlock,flags);
790 q->read_buf = NULL;
791 }
792 if (retval < 0)
793 break;
794 }
795
796 done:
797 mutex_unlock(&q->lock);
798 return retval;
799}
800
801unsigned int videobuf_poll_stream(struct file *file,
802 struct videobuf_queue *q,
803 poll_table *wait)
804{
805 struct videobuf_buffer *buf = NULL;
806 unsigned int rc = 0;
807
808 mutex_lock(&q->lock);
809 if (q->streaming) {
810 if (!list_empty(&q->stream))
811 buf = list_entry(q->stream.next,
812 struct videobuf_buffer, stream);
813 } else {
814 if (!q->reading)
815 videobuf_read_start(q);
816 if (!q->reading) {
817 rc = POLLERR;
818 } else if (NULL == q->read_buf) {
819 q->read_buf = list_entry(q->stream.next,
820 struct videobuf_buffer,
821 stream);
822 list_del(&q->read_buf->stream);
823 q->read_off = 0;
824 }
825 buf = q->read_buf;
826 }
827 if (!buf)
828 rc = POLLERR;
829
830 if (0 == rc) {
831 poll_wait(file, &buf->done, wait);
832 if (buf->state == STATE_DONE ||
833 buf->state == STATE_ERROR)
834 rc = POLLIN|POLLRDNORM;
835 }
836 mutex_unlock(&q->lock);
837 return rc;
838}
839
840int videobuf_mmap_setup(struct videobuf_queue *q,
841 unsigned int bcount, unsigned int bsize,
842 enum v4l2_memory memory)
843{
844 unsigned int i;
845 int err;
846
847 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
848
849 err = videobuf_mmap_free(q);
850 if (0 != err)
851 return err;
852
853 /* Allocate and initialize buffers */
854 for (i = 0; i < bcount; i++) {
855 q->bufs[i] = videobuf_alloc(q);
856
857 q->bufs[i]->i = i;
858 q->bufs[i]->input = UNSET;
859 q->bufs[i]->memory = memory;
860 q->bufs[i]->bsize = bsize;
861 switch (memory) {
862 case V4L2_MEMORY_MMAP:
863 q->bufs[i]->boff = bsize * i;
864 break;
865 case V4L2_MEMORY_USERPTR:
866 case V4L2_MEMORY_OVERLAY:
867 /* nothing */
868 break;
869 }
870 }
871
872 dprintk(1,"mmap setup: %d buffers, %d bytes each\n",
873 bcount,bsize);
874
875 return 0;
876}
877
878int videobuf_mmap_free(struct videobuf_queue *q)
879{
880 int i;
881 int rc;
882
883 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
884
885 rc = CALL(q,mmap_free,q);
886 if (rc<0)
887 return rc;
888
889 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
890 if (NULL == q->bufs[i])
891 continue;
892 q->ops->buf_release(q,q->bufs[i]);
893 kfree(q->bufs[i]);
894 q->bufs[i] = NULL;
895 }
896
897 return rc;
898}
899
900int videobuf_mmap_mapper(struct videobuf_queue *q,
901 struct vm_area_struct *vma)
902{
903 int retval;
904
905 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
906
907 mutex_lock(&q->lock);
908 retval=CALL(q,mmap_mapper,q,vma);
909 mutex_unlock(&q->lock);
910
911 return retval;
912}
913
914#ifdef CONFIG_VIDEO_V4L1_COMPAT
915int videobuf_cgmbuf(struct videobuf_queue *q,
916 struct video_mbuf *mbuf, int count)
917{
918 struct v4l2_requestbuffers req;
919 int rc,i;
920
921 MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
922
923 memset(&req,0,sizeof(req));
924 req.type = q->type;
925 req.count = count;
926 req.memory = V4L2_MEMORY_MMAP;
927 rc = videobuf_reqbufs(q,&req);
928 if (rc < 0)
929 return rc;
930
931 mbuf->frames = req.count;
932 mbuf->size = 0;
933 for (i = 0; i < mbuf->frames; i++) {
934 mbuf->offsets[i] = q->bufs[i]->boff;
935 mbuf->size += q->bufs[i]->bsize;
936 }
937
938 return 0;
939}
940#endif
941
942/* --------------------------------------------------------------------- */
943
944EXPORT_SYMBOL_GPL(videobuf_waiton);
945EXPORT_SYMBOL_GPL(videobuf_iolock);
946
947EXPORT_SYMBOL_GPL(videobuf_alloc);
948
949EXPORT_SYMBOL_GPL(videobuf_queue_init);
950EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
951EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
952
953EXPORT_SYMBOL_GPL(videobuf_next_field);
954EXPORT_SYMBOL_GPL(videobuf_reqbufs);
955EXPORT_SYMBOL_GPL(videobuf_querybuf);
956EXPORT_SYMBOL_GPL(videobuf_qbuf);
957EXPORT_SYMBOL_GPL(videobuf_dqbuf);
958EXPORT_SYMBOL_GPL(videobuf_cgmbuf);
959EXPORT_SYMBOL_GPL(videobuf_streamon);
960EXPORT_SYMBOL_GPL(videobuf_streamoff);
961
962EXPORT_SYMBOL_GPL(videobuf_read_start);
963EXPORT_SYMBOL_GPL(videobuf_read_stop);
964EXPORT_SYMBOL_GPL(videobuf_read_stream);
965EXPORT_SYMBOL_GPL(videobuf_read_one);
966EXPORT_SYMBOL_GPL(videobuf_poll_stream);
967
968EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
969EXPORT_SYMBOL_GPL(videobuf_mmap_free);
970EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);
971
972/*
973 * Local variables:
974 * c-basic-offset: 8
975 * End:
976 */
diff --git a/drivers/media/video/videobuf-dma-sg.c b/drivers/media/video/videobuf-dma-sg.c
new file mode 100644
index 000000000000..3345877c47d4
--- /dev/null
+++ b/drivers/media/video/videobuf-dma-sg.c
@@ -0,0 +1,772 @@
1/*
2 * helper functions for PCI 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/pci.h>
28#include <linux/vmalloc.h>
29#include <linux/pagemap.h>
30#include <asm/page.h>
31#include <asm/pgtable.h>
32
33#include <media/videobuf-dma-sg.h>
34
35#define MAGIC_DMABUF 0x19721112
36#define MAGIC_SG_MEM 0x17890714
37
38#define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \
39 { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }
40
41static int debug = 0;
42module_param(debug, int, 0644);
43
44MODULE_DESCRIPTION("helper module to manage video4linux pci dma sg buffers");
45MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
46MODULE_LICENSE("GPL");
47
48#define dprintk(level, fmt, arg...) if (debug >= level) \
49 printk(KERN_DEBUG "vbuf-sg: " fmt , ## arg)
50
51/* --------------------------------------------------------------------- */
52
53struct scatterlist*
54videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages)
55{
56 struct scatterlist *sglist;
57 struct page *pg;
58 int i;
59
60 sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
61 if (NULL == sglist)
62 return NULL;
63 for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
64 pg = vmalloc_to_page(virt);
65 if (NULL == pg)
66 goto err;
67 BUG_ON(PageHighMem(pg));
68 sglist[i].page = pg;
69 sglist[i].length = PAGE_SIZE;
70 }
71 return sglist;
72
73 err:
74 kfree(sglist);
75 return NULL;
76}
77
78struct scatterlist*
79videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset)
80{
81 struct scatterlist *sglist;
82 int i = 0;
83
84 if (NULL == pages[0])
85 return NULL;
86 sglist = kcalloc(nr_pages, sizeof(*sglist), GFP_KERNEL);
87 if (NULL == sglist)
88 return NULL;
89
90 if (NULL == pages[0])
91 goto nopage;
92 if (PageHighMem(pages[0]))
93 /* DMA to highmem pages might not work */
94 goto highmem;
95 sglist[0].page = pages[0];
96 sglist[0].offset = offset;
97 sglist[0].length = PAGE_SIZE - offset;
98 for (i = 1; i < nr_pages; i++) {
99 if (NULL == pages[i])
100 goto nopage;
101 if (PageHighMem(pages[i]))
102 goto highmem;
103 sglist[i].page = pages[i];
104 sglist[i].length = PAGE_SIZE;
105 }
106 return sglist;
107
108 nopage:
109 dprintk(2,"sgl: oops - no page\n");
110 kfree(sglist);
111 return NULL;
112
113 highmem:
114 dprintk(2,"sgl: oops - highmem page\n");
115 kfree(sglist);
116 return NULL;
117}
118
119/* --------------------------------------------------------------------- */
120
121struct videobuf_dmabuf *videobuf_to_dma (struct videobuf_buffer *buf)
122{
123 struct videbuf_pci_sg_memory *mem=buf->priv;
124 BUG_ON (!mem);
125
126 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
127
128 return &mem->dma;
129}
130
131void videobuf_dma_init(struct videobuf_dmabuf *dma)
132{
133 memset(dma,0,sizeof(*dma));
134 dma->magic = MAGIC_DMABUF;
135}
136
137int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
138 unsigned long data, unsigned long size)
139{
140 unsigned long first,last;
141 int err, rw = 0;
142
143 dma->direction = direction;
144 switch (dma->direction) {
145 case PCI_DMA_FROMDEVICE: rw = READ; break;
146 case PCI_DMA_TODEVICE: rw = WRITE; break;
147 default: BUG();
148 }
149
150 first = (data & PAGE_MASK) >> PAGE_SHIFT;
151 last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
152 dma->offset = data & ~PAGE_MASK;
153 dma->nr_pages = last-first+1;
154 dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*),
155 GFP_KERNEL);
156 if (NULL == dma->pages)
157 return -ENOMEM;
158 dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n",
159 data,size,dma->nr_pages);
160
161 dma->varea = (void *) data;
162
163 down_read(&current->mm->mmap_sem);
164 err = get_user_pages(current,current->mm,
165 data & PAGE_MASK, dma->nr_pages,
166 rw == READ, 1, /* force */
167 dma->pages, NULL);
168 up_read(&current->mm->mmap_sem);
169 if (err != dma->nr_pages) {
170 dma->nr_pages = (err >= 0) ? err : 0;
171 dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages);
172 return err < 0 ? err : -EINVAL;
173 }
174 return 0;
175}
176
177int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
178 int nr_pages)
179{
180 dprintk(1,"init kernel [%d pages]\n",nr_pages);
181 dma->direction = direction;
182 dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT);
183 if (NULL == dma->vmalloc) {
184 dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages);
185 return -ENOMEM;
186 }
187 dprintk(1,"vmalloc is at addr 0x%08lx, size=%d\n",
188 (unsigned long)dma->vmalloc,
189 nr_pages << PAGE_SHIFT);
190 memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT);
191 dma->nr_pages = nr_pages;
192 return 0;
193}
194
195int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
196 dma_addr_t addr, int nr_pages)
197{
198 dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n",
199 nr_pages,(unsigned long)addr);
200 dma->direction = direction;
201 if (0 == addr)
202 return -EINVAL;
203
204 dma->bus_addr = addr;
205 dma->nr_pages = nr_pages;
206 return 0;
207}
208
209int videobuf_dma_map(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
210{
211 void *dev=q->dev;
212 struct videobuf_dma_sg_ops *ops=q->priv_ops;
213
214 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
215 BUG_ON(0 == dma->nr_pages);
216
217 if (dma->pages) {
218 dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
219 dma->offset);
220 }
221 if (dma->vmalloc) {
222 dma->sglist = videobuf_vmalloc_to_sg
223 (dma->vmalloc,dma->nr_pages);
224 }
225 if (dma->bus_addr) {
226 dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL);
227 if (NULL != dma->sglist) {
228 dma->sglen = 1;
229 sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK;
230 dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK;
231 sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE;
232 }
233 }
234 if (NULL == dma->sglist) {
235 dprintk(1,"scatterlist is NULL\n");
236 return -ENOMEM;
237 }
238 if (!dma->bus_addr) {
239 if (ops && ops->vb_map_sg) {
240 dma->sglen = ops->vb_map_sg(dev,dma->sglist,
241 dma->nr_pages, dma->direction);
242 }
243 if (0 == dma->sglen) {
244 printk(KERN_WARNING
245 "%s: videobuf_map_sg failed\n",__FUNCTION__);
246 kfree(dma->sglist);
247 dma->sglist = NULL;
248 dma->sglen = 0;
249 return -EIO;
250 }
251 }
252 return 0;
253}
254
255int videobuf_dma_sync(struct videobuf_queue *q,struct videobuf_dmabuf *dma)
256{
257 void *dev=q->dev;
258 struct videobuf_dma_sg_ops *ops=q->priv_ops;
259
260 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
261 BUG_ON(!dma->sglen);
262
263 if (!dma->bus_addr && ops && ops->vb_dma_sync_sg)
264 ops->vb_dma_sync_sg(dev,dma->sglist,dma->nr_pages,
265 dma->direction);
266
267 return 0;
268}
269
270int videobuf_dma_unmap(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
271{
272 void *dev=q->dev;
273 struct videobuf_dma_sg_ops *ops=q->priv_ops;
274
275 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
276 if (!dma->sglen)
277 return 0;
278
279 if (!dma->bus_addr && ops && ops->vb_unmap_sg)
280 ops->vb_unmap_sg(dev,dma->sglist,dma->nr_pages,
281 dma->direction);
282 kfree(dma->sglist);
283 dma->sglist = NULL;
284 dma->sglen = 0;
285 return 0;
286}
287
288int videobuf_dma_free(struct videobuf_dmabuf *dma)
289{
290 MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
291 BUG_ON(dma->sglen);
292
293 if (dma->pages) {
294 int i;
295 for (i=0; i < dma->nr_pages; i++)
296 page_cache_release(dma->pages[i]);
297 kfree(dma->pages);
298 dma->pages = NULL;
299 }
300
301 vfree(dma->vmalloc);
302 dma->vmalloc = NULL;
303 dma->varea = NULL;
304
305 if (dma->bus_addr) {
306 dma->bus_addr = 0;
307 }
308 dma->direction = PCI_DMA_NONE;
309 return 0;
310}
311
312/* --------------------------------------------------------------------- */
313
314int videobuf_pci_dma_map(struct pci_dev *pci,struct videobuf_dmabuf *dma)
315{
316 struct videobuf_queue q;
317 struct videobuf_dma_sg_ops qops;
318
319 q.dev=pci;
320 qops.vb_map_sg=(vb_map_sg_t *)pci_map_sg;
321 qops.vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
322 q.priv_ops = &qops;
323
324 return (videobuf_dma_map(&q,dma));
325}
326
327int videobuf_pci_dma_unmap(struct pci_dev *pci,struct videobuf_dmabuf *dma)
328{
329 struct videobuf_queue q;
330 struct videobuf_dma_sg_ops qops;
331
332 q.dev=pci;
333 qops.vb_map_sg=(vb_map_sg_t *)pci_map_sg;
334 qops.vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
335 q.priv_ops = &qops;
336
337 return (videobuf_dma_unmap(&q,dma));
338}
339
340/* --------------------------------------------------------------------- */
341
342static void
343videobuf_vm_open(struct vm_area_struct *vma)
344{
345 struct videobuf_mapping *map = vma->vm_private_data;
346
347 dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
348 map->count,vma->vm_start,vma->vm_end);
349 map->count++;
350}
351
352static void
353videobuf_vm_close(struct vm_area_struct *vma)
354{
355 struct videobuf_mapping *map = vma->vm_private_data;
356 struct videobuf_queue *q = map->q;
357 struct videbuf_pci_sg_memory *mem;
358 int i;
359
360 dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
361 map->count,vma->vm_start,vma->vm_end);
362
363 map->count--;
364 if (0 == map->count) {
365 dprintk(1,"munmap %p q=%p\n",map,q);
366 mutex_lock(&q->lock);
367 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
368 if (NULL == q->bufs[i])
369 continue;
370 mem=q->bufs[i]->priv;
371
372 if (!mem)
373 continue;
374
375 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
376
377 if (mem->map != map)
378 continue;
379 mem->map = NULL;
380 q->bufs[i]->baddr = 0;
381 q->ops->buf_release(q,q->bufs[i]);
382 }
383 mutex_unlock(&q->lock);
384 kfree(map);
385 }
386 return;
387}
388
389/*
390 * Get a anonymous page for the mapping. Make sure we can DMA to that
391 * memory location with 32bit PCI devices (i.e. don't use highmem for
392 * now ...). Bounce buffers don't work very well for the data rates
393 * video capture has.
394 */
395static struct page*
396videobuf_vm_nopage(struct vm_area_struct *vma, unsigned long vaddr,
397 int *type)
398{
399 struct page *page;
400
401 dprintk(3,"nopage: fault @ %08lx [vma %08lx-%08lx]\n",
402 vaddr,vma->vm_start,vma->vm_end);
403 if (vaddr > vma->vm_end)
404 return NOPAGE_SIGBUS;
405 page = alloc_page(GFP_USER | __GFP_DMA32);
406 if (!page)
407 return NOPAGE_OOM;
408 clear_user_page(page_address(page), vaddr, page);
409 if (type)
410 *type = VM_FAULT_MINOR;
411 return page;
412}
413
414static struct vm_operations_struct videobuf_vm_ops =
415{
416 .open = videobuf_vm_open,
417 .close = videobuf_vm_close,
418 .nopage = videobuf_vm_nopage,
419};
420
421/* ---------------------------------------------------------------------
422 * PCI handlers for the generic methods
423 */
424
425/* Allocated area consists on 3 parts:
426 struct video_buffer
427 struct <driver>_buffer (cx88_buffer, saa7134_buf, ...)
428 struct videobuf_pci_sg_memory
429 */
430
431static void *__videobuf_alloc(size_t size)
432{
433 struct videbuf_pci_sg_memory *mem;
434 struct videobuf_buffer *vb;
435
436 vb = kzalloc(size+sizeof(*mem),GFP_KERNEL);
437
438 mem = vb->priv = ((char *)vb)+size;
439 mem->magic=MAGIC_SG_MEM;
440
441 videobuf_dma_init(&mem->dma);
442
443 dprintk(1,"%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
444 __FUNCTION__,vb,(long)sizeof(*vb),(long)size-sizeof(*vb),
445 mem,(long)sizeof(*mem));
446
447 return vb;
448}
449
450static int __videobuf_iolock (struct videobuf_queue* q,
451 struct videobuf_buffer *vb,
452 struct v4l2_framebuffer *fbuf)
453{
454 int err,pages;
455 dma_addr_t bus;
456 struct videbuf_pci_sg_memory *mem=vb->priv;
457 BUG_ON(!mem);
458
459 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
460
461 switch (vb->memory) {
462 case V4L2_MEMORY_MMAP:
463 case V4L2_MEMORY_USERPTR:
464 if (0 == vb->baddr) {
465 /* no userspace addr -- kernel bounce buffer */
466 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
467 err = videobuf_dma_init_kernel( &mem->dma,
468 PCI_DMA_FROMDEVICE,
469 pages );
470 if (0 != err)
471 return err;
472 } else {
473 /* dma directly to userspace */
474 err = videobuf_dma_init_user( &mem->dma,
475 PCI_DMA_FROMDEVICE,
476 vb->baddr,vb->bsize );
477 if (0 != err)
478 return err;
479 }
480 break;
481 case V4L2_MEMORY_OVERLAY:
482 if (NULL == fbuf)
483 return -EINVAL;
484 /* FIXME: need sanity checks for vb->boff */
485 /*
486 * Using a double cast to avoid compiler warnings when
487 * building for PAE. Compiler doesn't like direct casting
488 * of a 32 bit ptr to 64 bit integer.
489 */
490 bus = (dma_addr_t)(unsigned long)fbuf->base + vb->boff;
491 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
492 err = videobuf_dma_init_overlay(&mem->dma,PCI_DMA_FROMDEVICE,
493 bus, pages);
494 if (0 != err)
495 return err;
496 break;
497 default:
498 BUG();
499 }
500 err = videobuf_dma_map(q,&mem->dma);
501 if (0 != err)
502 return err;
503
504 return 0;
505}
506
507static int __videobuf_sync(struct videobuf_queue *q,
508 struct videobuf_buffer *buf)
509{
510 struct videbuf_pci_sg_memory *mem=buf->priv;
511 BUG_ON (!mem);
512 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
513
514 return videobuf_dma_sync(q,&mem->dma);
515}
516
517static int __videobuf_mmap_free(struct videobuf_queue *q)
518{
519 int i;
520
521 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
522 if (q->bufs[i]) {
523 struct videbuf_pci_sg_memory *mem=q->bufs[i]->priv;
524 if (mem && mem->map)
525 return -EBUSY;
526 }
527 }
528
529 return 0;
530}
531
532static int __videobuf_mmap_mapper(struct videobuf_queue *q,
533 struct vm_area_struct *vma)
534{
535 struct videbuf_pci_sg_memory *mem;
536 struct videobuf_mapping *map;
537 unsigned int first,last,size,i;
538 int retval;
539
540 retval = -EINVAL;
541 if (!(vma->vm_flags & VM_WRITE)) {
542 dprintk(1,"mmap app bug: PROT_WRITE please\n");
543 goto done;
544 }
545 if (!(vma->vm_flags & VM_SHARED)) {
546 dprintk(1,"mmap app bug: MAP_SHARED please\n");
547 goto done;
548 }
549
550 /* look for first buffer to map */
551 for (first = 0; first < VIDEO_MAX_FRAME; first++) {
552 if (NULL == q->bufs[first])
553 continue;
554 mem=q->bufs[first]->priv;
555 BUG_ON (!mem);
556 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
557
558 if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
559 continue;
560 if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
561 break;
562 }
563 if (VIDEO_MAX_FRAME == first) {
564 dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
565 (vma->vm_pgoff << PAGE_SHIFT));
566 goto done;
567 }
568
569 /* look for last buffer to map */
570 for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
571 if (NULL == q->bufs[last])
572 continue;
573 if (V4L2_MEMORY_MMAP != q->bufs[last]->memory)
574 continue;
575 mem=q->bufs[last]->priv;
576 if (mem->map) {
577 retval = -EBUSY;
578 goto done;
579 }
580 size += q->bufs[last]->bsize;
581 if (size == (vma->vm_end - vma->vm_start))
582 break;
583 }
584 if (VIDEO_MAX_FRAME == last) {
585 dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n",
586 (vma->vm_end - vma->vm_start));
587 goto done;
588 }
589
590 /* create mapping + update buffer list */
591 retval = -ENOMEM;
592 map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
593 if (NULL == map)
594 goto done;
595 for (size = 0, i = first; i <= last; size += q->bufs[i++]->bsize) {
596 mem=q->bufs[i]->priv;
597 mem->map = map;
598 q->bufs[i]->baddr = vma->vm_start + size;
599 }
600 map->count = 1;
601 map->start = vma->vm_start;
602 map->end = vma->vm_end;
603 map->q = q;
604 vma->vm_ops = &videobuf_vm_ops;
605 vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
606 vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
607 vma->vm_private_data = map;
608 dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n",
609 map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
610 retval = 0;
611
612 done:
613 return retval;
614}
615
616static int __videobuf_is_mmapped (struct videobuf_buffer *buf)
617{
618 struct videbuf_pci_sg_memory *mem=buf->priv;
619
620 BUG_ON (!mem);
621 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
622
623 return (mem->map)?1:0;
624}
625
626static int __videobuf_copy_to_user ( struct videobuf_queue *q,
627 char __user *data, size_t count,
628 int nonblocking )
629{
630 struct videbuf_pci_sg_memory *mem=q->read_buf->priv;
631 BUG_ON (!mem);
632 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
633
634 /* copy to userspace */
635 if (count > q->read_buf->size - q->read_off)
636 count = q->read_buf->size - q->read_off;
637
638 if (copy_to_user(data, mem->dma.vmalloc+q->read_off, count))
639 return -EFAULT;
640
641 return count;
642}
643
644static int __videobuf_copy_stream ( struct videobuf_queue *q,
645 char __user *data, size_t count, size_t pos,
646 int vbihack, int nonblocking )
647{
648 unsigned int *fc;
649 struct videbuf_pci_sg_memory *mem=q->read_buf->priv;
650 BUG_ON (!mem);
651 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
652
653 if (vbihack) {
654 /* dirty, undocumented hack -- pass the frame counter
655 * within the last four bytes of each vbi data block.
656 * We need that one to maintain backward compatibility
657 * to all vbi decoding software out there ... */
658 fc = (unsigned int*)mem->dma.vmalloc;
659 fc += (q->read_buf->size>>2) -1;
660 *fc = q->read_buf->field_count >> 1;
661 dprintk(1,"vbihack: %d\n",*fc);
662 }
663
664 /* copy stuff using the common method */
665 count = __videobuf_copy_to_user (q,data,count,nonblocking);
666
667 if ( (count==-EFAULT) && (0 == pos) )
668 return -EFAULT;
669
670 return count;
671}
672
673static struct videobuf_qtype_ops pci_ops = {
674 .magic = MAGIC_QTYPE_OPS,
675
676 .alloc = __videobuf_alloc,
677 .iolock = __videobuf_iolock,
678 .sync = __videobuf_sync,
679 .mmap_free = __videobuf_mmap_free,
680 .mmap_mapper = __videobuf_mmap_mapper,
681 .is_mmapped = __videobuf_is_mmapped,
682 .copy_to_user = __videobuf_copy_to_user,
683 .copy_stream = __videobuf_copy_stream,
684};
685
686void *videobuf_pci_alloc (size_t size)
687{
688 struct videobuf_queue q;
689
690 /* Required to make generic handler to call __videobuf_alloc */
691 q.int_ops=&pci_ops;
692
693 q.msize=size;
694
695 return videobuf_alloc (&q);
696}
697
698void videobuf_queue_pci_init(struct videobuf_queue* q,
699 struct videobuf_queue_ops *ops,
700 void *dev,
701 spinlock_t *irqlock,
702 enum v4l2_buf_type type,
703 enum v4l2_field field,
704 unsigned int msize,
705 void *priv)
706{
707 struct videobuf_dma_sg_ops *priv_ops;
708
709 videobuf_queue_init(q, ops, dev, irqlock, type, field, msize, priv);
710 q->int_ops=&pci_ops;
711
712 /* FIXME: the code bellow should be removed after having a proper
713 * memory allocation method for vivi and tm6000
714 */
715 q->priv_ops= kzalloc(sizeof(struct videobuf_dma_sg_ops), GFP_KERNEL);
716 BUG_ON (!q->priv_ops);
717
718 priv_ops=q->priv_ops;
719
720 /* Sets default methods for handling Scatter Gather mapping */
721 priv_ops->vb_map_sg=(vb_map_sg_t *)pci_map_sg;
722 priv_ops->vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
723 priv_ops->vb_dma_sync_sg=(vb_map_sg_t *)pci_dma_sync_sg_for_cpu;
724}
725
726void videobuf_set_pci_ops (struct videobuf_queue* q,
727 struct videobuf_dma_sg_ops *ops)
728{
729 kfree (q->priv_ops);
730
731 q->priv_ops=ops;
732
733 if (!ops)
734 return;
735
736 /* If not specified, defaults to PCI map sg */
737 if (!ops->vb_map_sg)
738 ops->vb_map_sg=(vb_map_sg_t *)pci_map_sg;
739
740 if (!ops->vb_dma_sync_sg)
741 ops->vb_dma_sync_sg=(vb_map_sg_t *)pci_dma_sync_sg_for_cpu;
742 if (!ops->vb_unmap_sg)
743 ops->vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
744}
745
746
747/* --------------------------------------------------------------------- */
748
749EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
750
751EXPORT_SYMBOL_GPL(videobuf_to_dma);
752EXPORT_SYMBOL_GPL(videobuf_dma_init);
753EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
754EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
755EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
756EXPORT_SYMBOL_GPL(videobuf_dma_map);
757EXPORT_SYMBOL_GPL(videobuf_dma_sync);
758EXPORT_SYMBOL_GPL(videobuf_dma_unmap);
759EXPORT_SYMBOL_GPL(videobuf_dma_free);
760
761EXPORT_SYMBOL_GPL(videobuf_pci_dma_map);
762EXPORT_SYMBOL_GPL(videobuf_pci_dma_unmap);
763EXPORT_SYMBOL_GPL(videobuf_pci_alloc);
764
765EXPORT_SYMBOL_GPL(videobuf_queue_pci_init);
766EXPORT_SYMBOL_GPL(videobuf_set_pci_ops);
767
768/*
769 * Local variables:
770 * c-basic-offset: 8
771 * End:
772 */
diff --git a/include/media/videobuf-core.h b/include/media/videobuf-core.h
new file mode 100644
index 000000000000..0ac21ae44f69
--- /dev/null
+++ b/include/media/videobuf-core.h
@@ -0,0 +1,236 @@
1/*
2 * generic helper functions for handling video4linux capture buffers
3 *
4 * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
5 *
6 * Highly based on video-buf written originally by:
7 * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
8 * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org>
9 * (c) 2006 Ted Walther and John Sokol
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2
14 */
15
16#include <linux/poll.h>
17#ifdef CONFIG_VIDEO_V4L1_COMPAT
18#include <linux/videodev.h>
19#endif
20#include <linux/videodev2.h>
21
22#define UNSET (-1U)
23
24
25struct videobuf_buffer;
26struct videobuf_queue;
27
28/* --------------------------------------------------------------------- */
29
30/*
31 * A small set of helper functions to manage video4linux buffers.
32 *
33 * struct videobuf_buffer holds the data structures used by the helper
34 * functions, additionally some commonly used fields for v4l buffers
35 * (width, height, lists, waitqueue) are in there. That struct should
36 * be used as first element in the drivers buffer struct.
37 *
38 * about the mmap helpers (videobuf_mmap_*):
39 *
40 * The mmaper function allows to map any subset of contingous buffers.
41 * This includes one mmap() call for all buffers (which the original
42 * video4linux API uses) as well as one mmap() for every single buffer
43 * (which v4l2 uses).
44 *
45 * If there is a valid mapping for a buffer, buffer->baddr/bsize holds
46 * userspace address + size which can be feeded into the
47 * videobuf_dma_init_user function listed above.
48 *
49 */
50
51struct videobuf_mapping {
52 unsigned int count;
53 unsigned long start;
54 unsigned long end;
55 struct videobuf_queue *q;
56};
57
58enum videobuf_state {
59 STATE_NEEDS_INIT = 0,
60 STATE_PREPARED = 1,
61 STATE_QUEUED = 2,
62 STATE_ACTIVE = 3,
63 STATE_DONE = 4,
64 STATE_ERROR = 5,
65 STATE_IDLE = 6,
66};
67
68struct videobuf_buffer {
69 unsigned int i;
70 u32 magic;
71
72 /* info about the buffer */
73 unsigned int width;
74 unsigned int height;
75 unsigned int bytesperline; /* use only if != 0 */
76 unsigned long size;
77 unsigned int input;
78 enum v4l2_field field;
79 enum videobuf_state state;
80 struct list_head stream; /* QBUF/DQBUF list */
81
82 /* touched by irq handler */
83 struct list_head queue;
84 wait_queue_head_t done;
85 unsigned int field_count;
86 struct timeval ts;
87
88 /* Memory type */
89 enum v4l2_memory memory;
90
91 /* buffer size */
92 size_t bsize;
93
94 /* buffer offset (mmap + overlay) */
95 size_t boff;
96
97 /* buffer addr (userland ptr!) */
98 unsigned long baddr;
99
100 /* Private pointer to allow specific methods to store their data */
101 int privsize;
102 void *priv;
103};
104
105struct videobuf_queue_ops {
106 int (*buf_setup)(struct videobuf_queue *q,
107 unsigned int *count, unsigned int *size);
108 int (*buf_prepare)(struct videobuf_queue *q,
109 struct videobuf_buffer *vb,
110 enum v4l2_field field);
111 void (*buf_queue)(struct videobuf_queue *q,
112 struct videobuf_buffer *vb);
113 void (*buf_release)(struct videobuf_queue *q,
114 struct videobuf_buffer *vb);
115};
116
117#define MAGIC_QTYPE_OPS 0x12261003
118
119/* Helper operations - device type dependent */
120struct videobuf_qtype_ops {
121 u32 magic;
122
123 void* (*alloc) (size_t size);
124 int (*iolock) (struct videobuf_queue* q,
125 struct videobuf_buffer *vb,
126 struct v4l2_framebuffer *fbuf);
127 int (*mmap) (struct videobuf_queue *q,
128 unsigned int *count,
129 unsigned int *size,
130 enum v4l2_memory memory);
131 int (*sync) (struct videobuf_queue* q,
132 struct videobuf_buffer *buf);
133 int (*copy_to_user) (struct videobuf_queue *q,
134 char __user *data,
135 size_t count,
136 int nonblocking);
137 int (*copy_stream) (struct videobuf_queue *q,
138 char __user *data,
139 size_t count,
140 size_t pos,
141 int vbihack,
142 int nonblocking);
143 int (*mmap_free) (struct videobuf_queue *q);
144 int (*mmap_mapper) (struct videobuf_queue *q,
145 struct vm_area_struct *vma);
146 int (*is_mmapped) (struct videobuf_buffer *buf);
147};
148
149struct videobuf_queue {
150 struct mutex lock;
151 spinlock_t *irqlock;
152 void *dev; /* on pci, points to struct pci_dev */
153
154 enum v4l2_buf_type type;
155 unsigned int inputs; /* for V4L2_BUF_FLAG_INPUT */
156 unsigned int msize;
157 enum v4l2_field field;
158 enum v4l2_field last; /* for field=V4L2_FIELD_ALTERNATE */
159 struct videobuf_buffer *bufs[VIDEO_MAX_FRAME];
160 struct videobuf_queue_ops *ops;
161 struct videobuf_qtype_ops *int_ops;
162
163 /* capture via mmap() + ioctl(QBUF/DQBUF) */
164 unsigned int streaming;
165 struct list_head stream;
166
167 /* capture via read() */
168 unsigned int reading;
169 unsigned int read_off;
170 struct videobuf_buffer *read_buf;
171
172 /* driver private data */
173 void *priv_data;
174
175 /*FIXME: should be removed after completing the vb conversion */
176 void *priv_ops;
177};
178
179int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr);
180int videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb,
181 struct v4l2_framebuffer *fbuf);
182
183void *videobuf_alloc(struct videobuf_queue* q);
184
185void videobuf_queue_init(struct videobuf_queue *q,
186 struct videobuf_queue_ops *ops,
187 void *dev,
188 spinlock_t *irqlock,
189 enum v4l2_buf_type type,
190 enum v4l2_field field,
191 unsigned int msize,
192 void *priv);
193int videobuf_queue_is_busy(struct videobuf_queue *q);
194void videobuf_queue_cancel(struct videobuf_queue *q);
195
196enum v4l2_field videobuf_next_field(struct videobuf_queue *q);
197int videobuf_reqbufs(struct videobuf_queue *q,
198 struct v4l2_requestbuffers *req);
199int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b);
200int videobuf_qbuf(struct videobuf_queue *q,
201 struct v4l2_buffer *b);
202int videobuf_dqbuf(struct videobuf_queue *q,
203 struct v4l2_buffer *b, int nonblocking);
204#ifdef CONFIG_VIDEO_V4L1_COMPAT
205int videobuf_cgmbuf(struct videobuf_queue *q,
206 struct video_mbuf *mbuf, int count);
207#endif
208int videobuf_streamon(struct videobuf_queue *q);
209int videobuf_streamoff(struct videobuf_queue *q);
210
211int videobuf_read_start(struct videobuf_queue *q);
212void videobuf_read_stop(struct videobuf_queue *q);
213ssize_t videobuf_read_stream(struct videobuf_queue *q,
214 char __user *data, size_t count, loff_t *ppos,
215 int vbihack, int nonblocking);
216ssize_t videobuf_read_one(struct videobuf_queue *q,
217 char __user *data, size_t count, loff_t *ppos,
218 int nonblocking);
219unsigned int videobuf_poll_stream(struct file *file,
220 struct videobuf_queue *q,
221 poll_table *wait);
222
223int videobuf_mmap_setup(struct videobuf_queue *q,
224 unsigned int bcount, unsigned int bsize,
225 enum v4l2_memory memory);
226int videobuf_mmap_free(struct videobuf_queue *q);
227int videobuf_mmap_mapper(struct videobuf_queue *q,
228 struct vm_area_struct *vma);
229
230/* --------------------------------------------------------------------- */
231
232/*
233 * Local variables:
234 * c-basic-offset: 8
235 * End:
236 */
diff --git a/include/media/videobuf-dma-sg.h b/include/media/videobuf-dma-sg.h
new file mode 100644
index 000000000000..62a3709905f3
--- /dev/null
+++ b/include/media/videobuf-dma-sg.h
@@ -0,0 +1,142 @@
1/*
2 * helper functions for PCI 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 <media/videobuf-core.h>
22
23/* --------------------------------------------------------------------- */
24
25/*
26 * Return a scatterlist for some page-aligned vmalloc()'ed memory
27 * block (NULL on errors). Memory for the scatterlist is allocated
28 * using kmalloc. The caller must free the memory.
29 */
30struct scatterlist* videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages);
31
32/*
33 * Return a scatterlist for a an array of userpages (NULL on errors).
34 * Memory for the scatterlist is allocated using kmalloc. The caller
35 * must free the memory.
36 */
37struct scatterlist* videobuf_pages_to_sg(struct page **pages, int nr_pages,
38 int offset);
39
40/* --------------------------------------------------------------------- */
41
42/*
43 * A small set of helper functions to manage buffers (both userland
44 * and kernel) for DMA.
45 *
46 * videobuf_dma_init_*()
47 * creates a buffer. The userland version takes a userspace
48 * pointer + length. The kernel version just wants the size and
49 * does memory allocation too using vmalloc_32().
50 *
51 * videobuf_dma_*()
52 * see Documentation/DMA-mapping.txt, these functions to
53 * basically the same. The map function does also build a
54 * scatterlist for the buffer (and unmap frees it ...)
55 *
56 * videobuf_dma_free()
57 * no comment ...
58 *
59 */
60
61struct videobuf_dmabuf {
62 u32 magic;
63
64 /* for userland buffer */
65 int offset;
66 struct page **pages;
67
68 /* for kernel buffers */
69 void *vmalloc;
70
71 /* Stores the userspace pointer to vmalloc area */
72 void *varea;
73
74 /* for overlay buffers (pci-pci dma) */
75 dma_addr_t bus_addr;
76
77 /* common */
78 struct scatterlist *sglist;
79 int sglen;
80 int nr_pages;
81 int direction;
82};
83
84struct videbuf_pci_sg_memory
85{
86 u32 magic;
87
88 /* for mmap'ed buffers */
89 struct videobuf_mapping *map;
90 struct videobuf_dmabuf dma;
91};
92
93/* FIXME: To be removed soon */
94typedef int (vb_map_sg_t)(void *dev, struct scatterlist *sglist, int nr_pages,
95 int direction);
96
97/* FIXME: To be removed soon */
98struct videobuf_dma_sg_ops
99{
100 vb_map_sg_t *vb_map_sg;
101 vb_map_sg_t *vb_dma_sync_sg;
102 vb_map_sg_t *vb_unmap_sg;
103
104};
105
106void videobuf_dma_init(struct videobuf_dmabuf *dma);
107int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
108 unsigned long data, unsigned long size);
109int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
110 int nr_pages);
111int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
112 dma_addr_t addr, int nr_pages);
113int videobuf_dma_free(struct videobuf_dmabuf *dma);
114
115int videobuf_dma_map(struct videobuf_queue* q,struct videobuf_dmabuf *dma);
116int videobuf_dma_sync(struct videobuf_queue* q,struct videobuf_dmabuf *dma);
117int videobuf_dma_unmap(struct videobuf_queue* q,struct videobuf_dmabuf *dma);
118struct videobuf_dmabuf *videobuf_to_dma (struct videobuf_buffer *buf);
119
120void *videobuf_pci_alloc (size_t size);
121
122void videobuf_queue_pci_init(struct videobuf_queue* q,
123 struct videobuf_queue_ops *ops,
124 void *dev,
125 spinlock_t *irqlock,
126 enum v4l2_buf_type type,
127 enum v4l2_field field,
128 unsigned int msize,
129 void *priv);
130
131 /*FIXME: these variants are used only on *-alsa code, where videobuf is
132 * used without queue
133 */
134int videobuf_pci_dma_map(struct pci_dev *pci,struct videobuf_dmabuf *dma);
135int videobuf_pci_dma_unmap(struct pci_dev *pci,struct videobuf_dmabuf *dma);
136
137/* FIXME: temporary routine for vivi and tm6000, while lacking implementation
138 * of videobuf-vmalloc
139 */
140void videobuf_set_pci_ops (struct videobuf_queue* q,
141 struct videobuf_dma_sg_ops *ops);
142
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-24 05:12:36 -0500