diff options
Diffstat (limited to 'drivers/media/video/video-buf.c')
-rw-r--r-- | drivers/media/video/video-buf.c | 1290 |
1 files changed, 1290 insertions, 0 deletions
diff --git a/drivers/media/video/video-buf.c b/drivers/media/video/video-buf.c new file mode 100644 index 000000000000..5afdc7852610 --- /dev/null +++ b/drivers/media/video/video-buf.c | |||
@@ -0,0 +1,1290 @@ | |||
1 | /* | ||
2 | * $Id: video-buf.c,v 1.18 2005/02/24 13:32:30 kraxel Exp $ | ||
3 | * | ||
4 | * generic helper functions for video4linux capture buffers, to handle | ||
5 | * memory management and PCI DMA. Right now bttv + saa7134 use it. | ||
6 | * | ||
7 | * The functions expect the hardware being able to scatter gatter | ||
8 | * (i.e. the buffers are not linear in physical memory, but fragmented | ||
9 | * into PAGE_SIZE chunks). They also assume the driver does not need | ||
10 | * to touch the video data (thus it is probably not useful for USB 1.1 | ||
11 | * as data often must be uncompressed by the drivers). | ||
12 | * | ||
13 | * (c) 2001-2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs] | ||
14 | * | ||
15 | * This program is free software; you can redistribute it and/or modify | ||
16 | * it under the terms of the GNU General Public License as published by | ||
17 | * the Free Software Foundation; either version 2 of the License, or | ||
18 | * (at your option) any later version. | ||
19 | */ | ||
20 | |||
21 | #include <linux/init.h> | ||
22 | #include <linux/module.h> | ||
23 | #include <linux/moduleparam.h> | ||
24 | #include <linux/vmalloc.h> | ||
25 | #include <linux/pagemap.h> | ||
26 | #include <linux/slab.h> | ||
27 | #include <linux/pci.h> | ||
28 | #include <linux/interrupt.h> | ||
29 | #include <asm/page.h> | ||
30 | #include <asm/pgtable.h> | ||
31 | |||
32 | #include <media/video-buf.h> | ||
33 | |||
34 | #define MAGIC_DMABUF 0x19721112 | ||
35 | #define MAGIC_BUFFER 0x20040302 | ||
36 | #define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \ | ||
37 | { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); } | ||
38 | |||
39 | static int debug = 0; | ||
40 | module_param(debug, int, 0644); | ||
41 | |||
42 | MODULE_DESCRIPTION("helper module to manage video4linux pci dma buffers"); | ||
43 | MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]"); | ||
44 | MODULE_LICENSE("GPL"); | ||
45 | |||
46 | #define dprintk(level, fmt, arg...) if (debug >= level) \ | ||
47 | printk(KERN_DEBUG "vbuf: " fmt , ## arg) | ||
48 | |||
49 | struct scatterlist* | ||
50 | videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages) | ||
51 | { | ||
52 | struct scatterlist *sglist; | ||
53 | struct page *pg; | ||
54 | int i; | ||
55 | |||
56 | sglist = kmalloc(sizeof(struct scatterlist)*nr_pages, GFP_KERNEL); | ||
57 | if (NULL == sglist) | ||
58 | return NULL; | ||
59 | memset(sglist,0,sizeof(struct scatterlist)*nr_pages); | ||
60 | for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) { | ||
61 | pg = vmalloc_to_page(virt); | ||
62 | if (NULL == pg) | ||
63 | goto err; | ||
64 | if (PageHighMem(pg)) | ||
65 | BUG(); | ||
66 | sglist[i].page = pg; | ||
67 | sglist[i].length = PAGE_SIZE; | ||
68 | } | ||
69 | return sglist; | ||
70 | |||
71 | err: | ||
72 | kfree(sglist); | ||
73 | return NULL; | ||
74 | } | ||
75 | |||
76 | struct scatterlist* | ||
77 | videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset) | ||
78 | { | ||
79 | struct scatterlist *sglist; | ||
80 | int i = 0; | ||
81 | |||
82 | if (NULL == pages[0]) | ||
83 | return NULL; | ||
84 | sglist = kmalloc(sizeof(*sglist) * nr_pages, GFP_KERNEL); | ||
85 | if (NULL == sglist) | ||
86 | return NULL; | ||
87 | memset(sglist, 0, sizeof(*sglist) * nr_pages); | ||
88 | |||
89 | if (NULL == pages[0]) | ||
90 | goto nopage; | ||
91 | if (PageHighMem(pages[0])) | ||
92 | /* DMA to highmem pages might not work */ | ||
93 | goto highmem; | ||
94 | sglist[0].page = pages[0]; | ||
95 | sglist[0].offset = offset; | ||
96 | sglist[0].length = PAGE_SIZE - offset; | ||
97 | for (i = 1; i < nr_pages; i++) { | ||
98 | if (NULL == pages[i]) | ||
99 | goto nopage; | ||
100 | if (PageHighMem(pages[i])) | ||
101 | goto highmem; | ||
102 | sglist[i].page = pages[i]; | ||
103 | sglist[i].length = PAGE_SIZE; | ||
104 | } | ||
105 | return sglist; | ||
106 | |||
107 | nopage: | ||
108 | dprintk(2,"sgl: oops - no page\n"); | ||
109 | kfree(sglist); | ||
110 | return NULL; | ||
111 | |||
112 | highmem: | ||
113 | dprintk(2,"sgl: oops - highmem page\n"); | ||
114 | kfree(sglist); | ||
115 | return NULL; | ||
116 | } | ||
117 | |||
118 | /* --------------------------------------------------------------------- */ | ||
119 | |||
120 | void videobuf_dma_init(struct videobuf_dmabuf *dma) | ||
121 | { | ||
122 | memset(dma,0,sizeof(*dma)); | ||
123 | dma->magic = MAGIC_DMABUF; | ||
124 | } | ||
125 | |||
126 | int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction, | ||
127 | unsigned long data, unsigned long size) | ||
128 | { | ||
129 | unsigned long first,last; | ||
130 | int err, rw = 0; | ||
131 | |||
132 | dma->direction = direction; | ||
133 | switch (dma->direction) { | ||
134 | case PCI_DMA_FROMDEVICE: rw = READ; break; | ||
135 | case PCI_DMA_TODEVICE: rw = WRITE; break; | ||
136 | default: BUG(); | ||
137 | } | ||
138 | |||
139 | first = (data & PAGE_MASK) >> PAGE_SHIFT; | ||
140 | last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT; | ||
141 | dma->offset = data & ~PAGE_MASK; | ||
142 | dma->nr_pages = last-first+1; | ||
143 | dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*), | ||
144 | GFP_KERNEL); | ||
145 | if (NULL == dma->pages) | ||
146 | return -ENOMEM; | ||
147 | dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n", | ||
148 | data,size,dma->nr_pages); | ||
149 | |||
150 | down_read(¤t->mm->mmap_sem); | ||
151 | err = get_user_pages(current,current->mm, | ||
152 | data & PAGE_MASK, dma->nr_pages, | ||
153 | rw == READ, 1, /* force */ | ||
154 | dma->pages, NULL); | ||
155 | up_read(¤t->mm->mmap_sem); | ||
156 | if (err != dma->nr_pages) { | ||
157 | dma->nr_pages = (err >= 0) ? err : 0; | ||
158 | dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages); | ||
159 | return err < 0 ? err : -EINVAL; | ||
160 | } | ||
161 | return 0; | ||
162 | } | ||
163 | |||
164 | int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction, | ||
165 | int nr_pages) | ||
166 | { | ||
167 | dprintk(1,"init kernel [%d pages]\n",nr_pages); | ||
168 | dma->direction = direction; | ||
169 | dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT); | ||
170 | if (NULL == dma->vmalloc) { | ||
171 | dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages); | ||
172 | return -ENOMEM; | ||
173 | } | ||
174 | memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT); | ||
175 | dma->nr_pages = nr_pages; | ||
176 | return 0; | ||
177 | } | ||
178 | |||
179 | int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction, | ||
180 | dma_addr_t addr, int nr_pages) | ||
181 | { | ||
182 | dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n", | ||
183 | nr_pages,(unsigned long)addr); | ||
184 | dma->direction = direction; | ||
185 | if (0 == addr) | ||
186 | return -EINVAL; | ||
187 | |||
188 | dma->bus_addr = addr; | ||
189 | dma->nr_pages = nr_pages; | ||
190 | return 0; | ||
191 | } | ||
192 | |||
193 | int videobuf_dma_pci_map(struct pci_dev *dev, struct videobuf_dmabuf *dma) | ||
194 | { | ||
195 | MAGIC_CHECK(dma->magic,MAGIC_DMABUF); | ||
196 | BUG_ON(0 == dma->nr_pages); | ||
197 | |||
198 | if (dma->pages) { | ||
199 | dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages, | ||
200 | dma->offset); | ||
201 | } | ||
202 | if (dma->vmalloc) { | ||
203 | dma->sglist = videobuf_vmalloc_to_sg | ||
204 | (dma->vmalloc,dma->nr_pages); | ||
205 | } | ||
206 | if (dma->bus_addr) { | ||
207 | dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL); | ||
208 | if (NULL != dma->sglist) { | ||
209 | dma->sglen = 1; | ||
210 | sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK; | ||
211 | dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK; | ||
212 | sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE; | ||
213 | } | ||
214 | } | ||
215 | if (NULL == dma->sglist) { | ||
216 | dprintk(1,"scatterlist is NULL\n"); | ||
217 | return -ENOMEM; | ||
218 | } | ||
219 | |||
220 | if (!dma->bus_addr) { | ||
221 | dma->sglen = pci_map_sg(dev,dma->sglist,dma->nr_pages, | ||
222 | dma->direction); | ||
223 | if (0 == dma->sglen) { | ||
224 | printk(KERN_WARNING | ||
225 | "%s: pci_map_sg failed\n",__FUNCTION__); | ||
226 | kfree(dma->sglist); | ||
227 | dma->sglist = NULL; | ||
228 | dma->sglen = 0; | ||
229 | return -EIO; | ||
230 | } | ||
231 | } | ||
232 | return 0; | ||
233 | } | ||
234 | |||
235 | int videobuf_dma_pci_sync(struct pci_dev *dev, struct videobuf_dmabuf *dma) | ||
236 | { | ||
237 | MAGIC_CHECK(dma->magic,MAGIC_DMABUF); | ||
238 | BUG_ON(!dma->sglen); | ||
239 | |||
240 | if (!dma->bus_addr) | ||
241 | pci_dma_sync_sg_for_cpu(dev,dma->sglist,dma->nr_pages,dma->direction); | ||
242 | return 0; | ||
243 | } | ||
244 | |||
245 | int videobuf_dma_pci_unmap(struct pci_dev *dev, struct videobuf_dmabuf *dma) | ||
246 | { | ||
247 | MAGIC_CHECK(dma->magic,MAGIC_DMABUF); | ||
248 | if (!dma->sglen) | ||
249 | return 0; | ||
250 | |||
251 | if (!dma->bus_addr) | ||
252 | pci_unmap_sg(dev,dma->sglist,dma->nr_pages,dma->direction); | ||
253 | kfree(dma->sglist); | ||
254 | dma->sglist = NULL; | ||
255 | dma->sglen = 0; | ||
256 | return 0; | ||
257 | } | ||
258 | |||
259 | int videobuf_dma_free(struct videobuf_dmabuf *dma) | ||
260 | { | ||
261 | MAGIC_CHECK(dma->magic,MAGIC_DMABUF); | ||
262 | BUG_ON(dma->sglen); | ||
263 | |||
264 | if (dma->pages) { | ||
265 | int i; | ||
266 | for (i=0; i < dma->nr_pages; i++) | ||
267 | page_cache_release(dma->pages[i]); | ||
268 | kfree(dma->pages); | ||
269 | dma->pages = NULL; | ||
270 | } | ||
271 | if (dma->vmalloc) { | ||
272 | vfree(dma->vmalloc); | ||
273 | dma->vmalloc = NULL; | ||
274 | } | ||
275 | if (dma->bus_addr) { | ||
276 | dma->bus_addr = 0; | ||
277 | } | ||
278 | dma->direction = PCI_DMA_NONE; | ||
279 | return 0; | ||
280 | } | ||
281 | |||
282 | /* --------------------------------------------------------------------- */ | ||
283 | |||
284 | void* videobuf_alloc(unsigned int size) | ||
285 | { | ||
286 | struct videobuf_buffer *vb; | ||
287 | |||
288 | vb = kmalloc(size,GFP_KERNEL); | ||
289 | if (NULL != vb) { | ||
290 | memset(vb,0,size); | ||
291 | videobuf_dma_init(&vb->dma); | ||
292 | init_waitqueue_head(&vb->done); | ||
293 | vb->magic = MAGIC_BUFFER; | ||
294 | } | ||
295 | return vb; | ||
296 | } | ||
297 | |||
298 | int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr) | ||
299 | { | ||
300 | int retval = 0; | ||
301 | DECLARE_WAITQUEUE(wait, current); | ||
302 | |||
303 | MAGIC_CHECK(vb->magic,MAGIC_BUFFER); | ||
304 | add_wait_queue(&vb->done, &wait); | ||
305 | while (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) { | ||
306 | if (non_blocking) { | ||
307 | retval = -EAGAIN; | ||
308 | break; | ||
309 | } | ||
310 | set_current_state(intr ? TASK_INTERRUPTIBLE | ||
311 | : TASK_UNINTERRUPTIBLE); | ||
312 | if (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) | ||
313 | schedule(); | ||
314 | set_current_state(TASK_RUNNING); | ||
315 | if (intr && signal_pending(current)) { | ||
316 | dprintk(1,"buffer waiton: -EINTR\n"); | ||
317 | retval = -EINTR; | ||
318 | break; | ||
319 | } | ||
320 | } | ||
321 | remove_wait_queue(&vb->done, &wait); | ||
322 | return retval; | ||
323 | } | ||
324 | |||
325 | int | ||
326 | videobuf_iolock(struct pci_dev *pci, struct videobuf_buffer *vb, | ||
327 | struct v4l2_framebuffer *fbuf) | ||
328 | { | ||
329 | int err,pages; | ||
330 | dma_addr_t bus; | ||
331 | |||
332 | MAGIC_CHECK(vb->magic,MAGIC_BUFFER); | ||
333 | switch (vb->memory) { | ||
334 | case V4L2_MEMORY_MMAP: | ||
335 | case V4L2_MEMORY_USERPTR: | ||
336 | if (0 == vb->baddr) { | ||
337 | /* no userspace addr -- kernel bounce buffer */ | ||
338 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | ||
339 | err = videobuf_dma_init_kernel(&vb->dma,PCI_DMA_FROMDEVICE, | ||
340 | pages); | ||
341 | if (0 != err) | ||
342 | return err; | ||
343 | } else { | ||
344 | /* dma directly to userspace */ | ||
345 | err = videobuf_dma_init_user(&vb->dma,PCI_DMA_FROMDEVICE, | ||
346 | vb->baddr,vb->bsize); | ||
347 | if (0 != err) | ||
348 | return err; | ||
349 | } | ||
350 | break; | ||
351 | case V4L2_MEMORY_OVERLAY: | ||
352 | if (NULL == fbuf) | ||
353 | return -EINVAL; | ||
354 | /* FIXME: need sanity checks for vb->boff */ | ||
355 | bus = (dma_addr_t)fbuf->base + vb->boff; | ||
356 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | ||
357 | err = videobuf_dma_init_overlay(&vb->dma,PCI_DMA_FROMDEVICE, | ||
358 | bus, pages); | ||
359 | if (0 != err) | ||
360 | return err; | ||
361 | break; | ||
362 | default: | ||
363 | BUG(); | ||
364 | } | ||
365 | err = videobuf_dma_pci_map(pci,&vb->dma); | ||
366 | if (0 != err) | ||
367 | return err; | ||
368 | |||
369 | return 0; | ||
370 | } | ||
371 | |||
372 | /* --------------------------------------------------------------------- */ | ||
373 | |||
374 | void videobuf_queue_init(struct videobuf_queue* q, | ||
375 | struct videobuf_queue_ops *ops, | ||
376 | struct pci_dev *pci, | ||
377 | spinlock_t *irqlock, | ||
378 | enum v4l2_buf_type type, | ||
379 | enum v4l2_field field, | ||
380 | unsigned int msize, | ||
381 | void *priv) | ||
382 | { | ||
383 | memset(q,0,sizeof(*q)); | ||
384 | q->irqlock = irqlock; | ||
385 | q->pci = pci; | ||
386 | q->type = type; | ||
387 | q->field = field; | ||
388 | q->msize = msize; | ||
389 | q->ops = ops; | ||
390 | q->priv_data = priv; | ||
391 | |||
392 | init_MUTEX(&q->lock); | ||
393 | INIT_LIST_HEAD(&q->stream); | ||
394 | } | ||
395 | |||
396 | int | ||
397 | videobuf_queue_is_busy(struct videobuf_queue *q) | ||
398 | { | ||
399 | int i; | ||
400 | |||
401 | if (q->streaming) { | ||
402 | dprintk(1,"busy: streaming active\n"); | ||
403 | return 1; | ||
404 | } | ||
405 | if (q->reading) { | ||
406 | dprintk(1,"busy: pending read #1\n"); | ||
407 | return 1; | ||
408 | } | ||
409 | if (q->read_buf) { | ||
410 | dprintk(1,"busy: pending read #2\n"); | ||
411 | return 1; | ||
412 | } | ||
413 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | ||
414 | if (NULL == q->bufs[i]) | ||
415 | continue; | ||
416 | if (q->bufs[i]->map) { | ||
417 | dprintk(1,"busy: buffer #%d mapped\n",i); | ||
418 | return 1; | ||
419 | } | ||
420 | if (q->bufs[i]->state == STATE_QUEUED) { | ||
421 | dprintk(1,"busy: buffer #%d queued\n",i); | ||
422 | return 1; | ||
423 | } | ||
424 | if (q->bufs[i]->state == STATE_ACTIVE) { | ||
425 | dprintk(1,"busy: buffer #%d avtive\n",i); | ||
426 | return 1; | ||
427 | } | ||
428 | } | ||
429 | return 0; | ||
430 | } | ||
431 | |||
432 | void | ||
433 | videobuf_queue_cancel(struct videobuf_queue *q) | ||
434 | { | ||
435 | unsigned long flags; | ||
436 | int i; | ||
437 | |||
438 | /* remove queued buffers from list */ | ||
439 | spin_lock_irqsave(q->irqlock,flags); | ||
440 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | ||
441 | if (NULL == q->bufs[i]) | ||
442 | continue; | ||
443 | if (q->bufs[i]->state == STATE_QUEUED) { | ||
444 | list_del(&q->bufs[i]->queue); | ||
445 | q->bufs[i]->state = STATE_ERROR; | ||
446 | } | ||
447 | } | ||
448 | spin_unlock_irqrestore(q->irqlock,flags); | ||
449 | |||
450 | /* free all buffers + clear queue */ | ||
451 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | ||
452 | if (NULL == q->bufs[i]) | ||
453 | continue; | ||
454 | q->ops->buf_release(q,q->bufs[i]); | ||
455 | } | ||
456 | INIT_LIST_HEAD(&q->stream); | ||
457 | } | ||
458 | |||
459 | /* --------------------------------------------------------------------- */ | ||
460 | |||
461 | enum v4l2_field | ||
462 | videobuf_next_field(struct videobuf_queue *q) | ||
463 | { | ||
464 | enum v4l2_field field = q->field; | ||
465 | |||
466 | BUG_ON(V4L2_FIELD_ANY == field); | ||
467 | |||
468 | if (V4L2_FIELD_ALTERNATE == field) { | ||
469 | if (V4L2_FIELD_TOP == q->last) { | ||
470 | field = V4L2_FIELD_BOTTOM; | ||
471 | q->last = V4L2_FIELD_BOTTOM; | ||
472 | } else { | ||
473 | field = V4L2_FIELD_TOP; | ||
474 | q->last = V4L2_FIELD_TOP; | ||
475 | } | ||
476 | } | ||
477 | return field; | ||
478 | } | ||
479 | |||
480 | void | ||
481 | videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb, | ||
482 | enum v4l2_buf_type type) | ||
483 | { | ||
484 | MAGIC_CHECK(vb->magic,MAGIC_BUFFER); | ||
485 | |||
486 | b->index = vb->i; | ||
487 | b->type = type; | ||
488 | |||
489 | b->memory = vb->memory; | ||
490 | switch (b->memory) { | ||
491 | case V4L2_MEMORY_MMAP: | ||
492 | b->m.offset = vb->boff; | ||
493 | b->length = vb->bsize; | ||
494 | break; | ||
495 | case V4L2_MEMORY_USERPTR: | ||
496 | b->m.userptr = vb->baddr; | ||
497 | b->length = vb->bsize; | ||
498 | break; | ||
499 | case V4L2_MEMORY_OVERLAY: | ||
500 | b->m.offset = vb->boff; | ||
501 | break; | ||
502 | } | ||
503 | |||
504 | b->flags = 0; | ||
505 | if (vb->map) | ||
506 | b->flags |= V4L2_BUF_FLAG_MAPPED; | ||
507 | |||
508 | switch (vb->state) { | ||
509 | case STATE_PREPARED: | ||
510 | case STATE_QUEUED: | ||
511 | case STATE_ACTIVE: | ||
512 | b->flags |= V4L2_BUF_FLAG_QUEUED; | ||
513 | break; | ||
514 | case STATE_DONE: | ||
515 | case STATE_ERROR: | ||
516 | b->flags |= V4L2_BUF_FLAG_DONE; | ||
517 | break; | ||
518 | case STATE_NEEDS_INIT: | ||
519 | case STATE_IDLE: | ||
520 | /* nothing */ | ||
521 | break; | ||
522 | } | ||
523 | |||
524 | if (vb->input != UNSET) { | ||
525 | b->flags |= V4L2_BUF_FLAG_INPUT; | ||
526 | b->input = vb->input; | ||
527 | } | ||
528 | |||
529 | b->field = vb->field; | ||
530 | b->timestamp = vb->ts; | ||
531 | b->bytesused = vb->size; | ||
532 | b->sequence = vb->field_count >> 1; | ||
533 | } | ||
534 | |||
535 | int | ||
536 | videobuf_reqbufs(struct videobuf_queue *q, | ||
537 | struct v4l2_requestbuffers *req) | ||
538 | { | ||
539 | unsigned int size,count; | ||
540 | int retval; | ||
541 | |||
542 | if (req->type != q->type) | ||
543 | return -EINVAL; | ||
544 | if (req->count < 1) | ||
545 | return -EINVAL; | ||
546 | if (req->memory != V4L2_MEMORY_MMAP && | ||
547 | req->memory != V4L2_MEMORY_USERPTR && | ||
548 | req->memory != V4L2_MEMORY_OVERLAY) | ||
549 | return -EINVAL; | ||
550 | |||
551 | if (q->streaming) | ||
552 | return -EBUSY; | ||
553 | if (!list_empty(&q->stream)) | ||
554 | return -EBUSY; | ||
555 | |||
556 | down(&q->lock); | ||
557 | count = req->count; | ||
558 | if (count > VIDEO_MAX_FRAME) | ||
559 | count = VIDEO_MAX_FRAME; | ||
560 | size = 0; | ||
561 | q->ops->buf_setup(q,&count,&size); | ||
562 | size = PAGE_ALIGN(size); | ||
563 | dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n", | ||
564 | count, size, (count*size)>>PAGE_SHIFT); | ||
565 | |||
566 | retval = videobuf_mmap_setup(q,count,size,req->memory); | ||
567 | if (retval < 0) | ||
568 | goto done; | ||
569 | |||
570 | req->count = count; | ||
571 | |||
572 | done: | ||
573 | up(&q->lock); | ||
574 | return retval; | ||
575 | } | ||
576 | |||
577 | int | ||
578 | videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b) | ||
579 | { | ||
580 | if (unlikely(b->type != q->type)) | ||
581 | return -EINVAL; | ||
582 | if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) | ||
583 | return -EINVAL; | ||
584 | if (unlikely(NULL == q->bufs[b->index])) | ||
585 | return -EINVAL; | ||
586 | videobuf_status(b,q->bufs[b->index],q->type); | ||
587 | return 0; | ||
588 | } | ||
589 | |||
590 | int | ||
591 | videobuf_qbuf(struct videobuf_queue *q, | ||
592 | struct v4l2_buffer *b) | ||
593 | { | ||
594 | struct videobuf_buffer *buf; | ||
595 | enum v4l2_field field; | ||
596 | unsigned long flags; | ||
597 | int retval; | ||
598 | |||
599 | down(&q->lock); | ||
600 | retval = -EBUSY; | ||
601 | if (q->reading) | ||
602 | goto done; | ||
603 | retval = -EINVAL; | ||
604 | if (b->type != q->type) | ||
605 | goto done; | ||
606 | if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) | ||
607 | goto done; | ||
608 | buf = q->bufs[b->index]; | ||
609 | if (NULL == buf) | ||
610 | goto done; | ||
611 | MAGIC_CHECK(buf->magic,MAGIC_BUFFER); | ||
612 | if (buf->memory != b->memory) | ||
613 | goto done; | ||
614 | if (buf->state == STATE_QUEUED || | ||
615 | buf->state == STATE_ACTIVE) | ||
616 | goto done; | ||
617 | |||
618 | if (b->flags & V4L2_BUF_FLAG_INPUT) { | ||
619 | if (b->input >= q->inputs) | ||
620 | goto done; | ||
621 | buf->input = b->input; | ||
622 | } else { | ||
623 | buf->input = UNSET; | ||
624 | } | ||
625 | |||
626 | switch (b->memory) { | ||
627 | case V4L2_MEMORY_MMAP: | ||
628 | if (0 == buf->baddr) | ||
629 | goto done; | ||
630 | break; | ||
631 | case V4L2_MEMORY_USERPTR: | ||
632 | if (b->length < buf->bsize) | ||
633 | goto done; | ||
634 | if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr) | ||
635 | q->ops->buf_release(q,buf); | ||
636 | buf->baddr = b->m.userptr; | ||
637 | break; | ||
638 | case V4L2_MEMORY_OVERLAY: | ||
639 | buf->boff = b->m.offset; | ||
640 | break; | ||
641 | default: | ||
642 | goto done; | ||
643 | } | ||
644 | |||
645 | field = videobuf_next_field(q); | ||
646 | retval = q->ops->buf_prepare(q,buf,field); | ||
647 | if (0 != retval) | ||
648 | goto done; | ||
649 | |||
650 | list_add_tail(&buf->stream,&q->stream); | ||
651 | if (q->streaming) { | ||
652 | spin_lock_irqsave(q->irqlock,flags); | ||
653 | q->ops->buf_queue(q,buf); | ||
654 | spin_unlock_irqrestore(q->irqlock,flags); | ||
655 | } | ||
656 | retval = 0; | ||
657 | |||
658 | done: | ||
659 | up(&q->lock); | ||
660 | return retval; | ||
661 | } | ||
662 | |||
663 | int | ||
664 | videobuf_dqbuf(struct videobuf_queue *q, | ||
665 | struct v4l2_buffer *b, int nonblocking) | ||
666 | { | ||
667 | struct videobuf_buffer *buf; | ||
668 | int retval; | ||
669 | |||
670 | down(&q->lock); | ||
671 | retval = -EBUSY; | ||
672 | if (q->reading) | ||
673 | goto done; | ||
674 | retval = -EINVAL; | ||
675 | if (b->type != q->type) | ||
676 | goto done; | ||
677 | if (list_empty(&q->stream)) | ||
678 | goto done; | ||
679 | buf = list_entry(q->stream.next, struct videobuf_buffer, stream); | ||
680 | retval = videobuf_waiton(buf, nonblocking, 1); | ||
681 | if (retval < 0) | ||
682 | goto done; | ||
683 | switch (buf->state) { | ||
684 | case STATE_ERROR: | ||
685 | retval = -EIO; | ||
686 | /* fall through */ | ||
687 | case STATE_DONE: | ||
688 | videobuf_dma_pci_sync(q->pci,&buf->dma); | ||
689 | buf->state = STATE_IDLE; | ||
690 | break; | ||
691 | default: | ||
692 | retval = -EINVAL; | ||
693 | goto done; | ||
694 | } | ||
695 | list_del(&buf->stream); | ||
696 | memset(b,0,sizeof(*b)); | ||
697 | videobuf_status(b,buf,q->type); | ||
698 | |||
699 | done: | ||
700 | up(&q->lock); | ||
701 | return retval; | ||
702 | } | ||
703 | |||
704 | int videobuf_streamon(struct videobuf_queue *q) | ||
705 | { | ||
706 | struct videobuf_buffer *buf; | ||
707 | struct list_head *list; | ||
708 | unsigned long flags; | ||
709 | int retval; | ||
710 | |||
711 | down(&q->lock); | ||
712 | retval = -EBUSY; | ||
713 | if (q->reading) | ||
714 | goto done; | ||
715 | retval = 0; | ||
716 | if (q->streaming) | ||
717 | goto done; | ||
718 | q->streaming = 1; | ||
719 | spin_lock_irqsave(q->irqlock,flags); | ||
720 | list_for_each(list,&q->stream) { | ||
721 | buf = list_entry(list, struct videobuf_buffer, stream); | ||
722 | if (buf->state == STATE_PREPARED) | ||
723 | q->ops->buf_queue(q,buf); | ||
724 | } | ||
725 | spin_unlock_irqrestore(q->irqlock,flags); | ||
726 | |||
727 | done: | ||
728 | up(&q->lock); | ||
729 | return retval; | ||
730 | } | ||
731 | |||
732 | int videobuf_streamoff(struct videobuf_queue *q) | ||
733 | { | ||
734 | int retval = -EINVAL; | ||
735 | |||
736 | down(&q->lock); | ||
737 | if (!q->streaming) | ||
738 | goto done; | ||
739 | videobuf_queue_cancel(q); | ||
740 | q->streaming = 0; | ||
741 | retval = 0; | ||
742 | |||
743 | done: | ||
744 | up(&q->lock); | ||
745 | return retval; | ||
746 | } | ||
747 | |||
748 | static ssize_t | ||
749 | videobuf_read_zerocopy(struct videobuf_queue *q, char __user *data, | ||
750 | size_t count, loff_t *ppos) | ||
751 | { | ||
752 | enum v4l2_field field; | ||
753 | unsigned long flags; | ||
754 | int retval; | ||
755 | |||
756 | /* setup stuff */ | ||
757 | retval = -ENOMEM; | ||
758 | q->read_buf = videobuf_alloc(q->msize); | ||
759 | if (NULL == q->read_buf) | ||
760 | goto done; | ||
761 | |||
762 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | ||
763 | q->read_buf->baddr = (unsigned long)data; | ||
764 | q->read_buf->bsize = count; | ||
765 | field = videobuf_next_field(q); | ||
766 | retval = q->ops->buf_prepare(q,q->read_buf,field); | ||
767 | if (0 != retval) | ||
768 | goto done; | ||
769 | |||
770 | /* start capture & wait */ | ||
771 | spin_lock_irqsave(q->irqlock,flags); | ||
772 | q->ops->buf_queue(q,q->read_buf); | ||
773 | spin_unlock_irqrestore(q->irqlock,flags); | ||
774 | retval = videobuf_waiton(q->read_buf,0,0); | ||
775 | if (0 == retval) { | ||
776 | videobuf_dma_pci_sync(q->pci,&q->read_buf->dma); | ||
777 | if (STATE_ERROR == q->read_buf->state) | ||
778 | retval = -EIO; | ||
779 | else | ||
780 | retval = q->read_buf->size; | ||
781 | } | ||
782 | |||
783 | done: | ||
784 | /* cleanup */ | ||
785 | q->ops->buf_release(q,q->read_buf); | ||
786 | kfree(q->read_buf); | ||
787 | q->read_buf = NULL; | ||
788 | return retval; | ||
789 | } | ||
790 | |||
791 | ssize_t videobuf_read_one(struct videobuf_queue *q, | ||
792 | char __user *data, size_t count, loff_t *ppos, | ||
793 | int nonblocking) | ||
794 | { | ||
795 | enum v4l2_field field; | ||
796 | unsigned long flags; | ||
797 | unsigned size, nbufs, bytes; | ||
798 | int retval; | ||
799 | |||
800 | down(&q->lock); | ||
801 | |||
802 | nbufs = 1; size = 0; | ||
803 | q->ops->buf_setup(q,&nbufs,&size); | ||
804 | if (NULL == q->read_buf && | ||
805 | count >= size && | ||
806 | !nonblocking) { | ||
807 | retval = videobuf_read_zerocopy(q,data,count,ppos); | ||
808 | if (retval >= 0 || retval == -EIO) | ||
809 | /* ok, all done */ | ||
810 | goto done; | ||
811 | /* fallback to kernel bounce buffer on failures */ | ||
812 | } | ||
813 | |||
814 | if (NULL == q->read_buf) { | ||
815 | /* need to capture a new frame */ | ||
816 | retval = -ENOMEM; | ||
817 | q->read_buf = videobuf_alloc(q->msize); | ||
818 | if (NULL == q->read_buf) | ||
819 | goto done; | ||
820 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | ||
821 | field = videobuf_next_field(q); | ||
822 | retval = q->ops->buf_prepare(q,q->read_buf,field); | ||
823 | if (0 != retval) | ||
824 | goto done; | ||
825 | spin_lock_irqsave(q->irqlock,flags); | ||
826 | q->ops->buf_queue(q,q->read_buf); | ||
827 | spin_unlock_irqrestore(q->irqlock,flags); | ||
828 | q->read_off = 0; | ||
829 | } | ||
830 | |||
831 | /* wait until capture is done */ | ||
832 | retval = videobuf_waiton(q->read_buf, nonblocking, 1); | ||
833 | if (0 != retval) | ||
834 | goto done; | ||
835 | videobuf_dma_pci_sync(q->pci,&q->read_buf->dma); | ||
836 | |||
837 | if (STATE_ERROR == q->read_buf->state) { | ||
838 | /* catch I/O errors */ | ||
839 | q->ops->buf_release(q,q->read_buf); | ||
840 | kfree(q->read_buf); | ||
841 | q->read_buf = NULL; | ||
842 | retval = -EIO; | ||
843 | goto done; | ||
844 | } | ||
845 | |||
846 | /* copy to userspace */ | ||
847 | bytes = count; | ||
848 | if (bytes > q->read_buf->size - q->read_off) | ||
849 | bytes = q->read_buf->size - q->read_off; | ||
850 | retval = -EFAULT; | ||
851 | if (copy_to_user(data, q->read_buf->dma.vmalloc+q->read_off, bytes)) | ||
852 | goto done; | ||
853 | |||
854 | retval = bytes; | ||
855 | q->read_off += bytes; | ||
856 | if (q->read_off == q->read_buf->size) { | ||
857 | /* all data copied, cleanup */ | ||
858 | q->ops->buf_release(q,q->read_buf); | ||
859 | kfree(q->read_buf); | ||
860 | q->read_buf = NULL; | ||
861 | } | ||
862 | |||
863 | done: | ||
864 | up(&q->lock); | ||
865 | return retval; | ||
866 | } | ||
867 | |||
868 | int videobuf_read_start(struct videobuf_queue *q) | ||
869 | { | ||
870 | enum v4l2_field field; | ||
871 | unsigned long flags; | ||
872 | int count = 0, size = 0; | ||
873 | int err, i; | ||
874 | |||
875 | q->ops->buf_setup(q,&count,&size); | ||
876 | if (count < 2) | ||
877 | count = 2; | ||
878 | if (count > VIDEO_MAX_FRAME) | ||
879 | count = VIDEO_MAX_FRAME; | ||
880 | size = PAGE_ALIGN(size); | ||
881 | |||
882 | err = videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR); | ||
883 | if (err) | ||
884 | return err; | ||
885 | for (i = 0; i < count; i++) { | ||
886 | field = videobuf_next_field(q); | ||
887 | err = q->ops->buf_prepare(q,q->bufs[i],field); | ||
888 | if (err) | ||
889 | return err; | ||
890 | list_add_tail(&q->bufs[i]->stream, &q->stream); | ||
891 | } | ||
892 | spin_lock_irqsave(q->irqlock,flags); | ||
893 | for (i = 0; i < count; i++) | ||
894 | q->ops->buf_queue(q,q->bufs[i]); | ||
895 | spin_unlock_irqrestore(q->irqlock,flags); | ||
896 | q->reading = 1; | ||
897 | return 0; | ||
898 | } | ||
899 | |||
900 | void videobuf_read_stop(struct videobuf_queue *q) | ||
901 | { | ||
902 | int i; | ||
903 | |||
904 | videobuf_queue_cancel(q); | ||
905 | videobuf_mmap_free(q); | ||
906 | INIT_LIST_HEAD(&q->stream); | ||
907 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | ||
908 | if (NULL == q->bufs[i]) | ||
909 | continue; | ||
910 | kfree(q->bufs[i]); | ||
911 | q->bufs[i] = NULL; | ||
912 | } | ||
913 | q->read_buf = NULL; | ||
914 | q->reading = 0; | ||
915 | } | ||
916 | |||
917 | ssize_t videobuf_read_stream(struct videobuf_queue *q, | ||
918 | char __user *data, size_t count, loff_t *ppos, | ||
919 | int vbihack, int nonblocking) | ||
920 | { | ||
921 | unsigned int *fc, bytes; | ||
922 | int err, retval; | ||
923 | unsigned long flags; | ||
924 | |||
925 | dprintk(2,"%s\n",__FUNCTION__); | ||
926 | down(&q->lock); | ||
927 | retval = -EBUSY; | ||
928 | if (q->streaming) | ||
929 | goto done; | ||
930 | if (!q->reading) { | ||
931 | retval = videobuf_read_start(q); | ||
932 | if (retval < 0) | ||
933 | goto done; | ||
934 | } | ||
935 | |||
936 | retval = 0; | ||
937 | while (count > 0) { | ||
938 | /* get / wait for data */ | ||
939 | if (NULL == q->read_buf) { | ||
940 | q->read_buf = list_entry(q->stream.next, | ||
941 | struct videobuf_buffer, | ||
942 | stream); | ||
943 | list_del(&q->read_buf->stream); | ||
944 | q->read_off = 0; | ||
945 | } | ||
946 | err = videobuf_waiton(q->read_buf, nonblocking, 1); | ||
947 | if (err < 0) { | ||
948 | if (0 == retval) | ||
949 | retval = err; | ||
950 | break; | ||
951 | } | ||
952 | |||
953 | if (q->read_buf->state == STATE_DONE) { | ||
954 | if (vbihack) { | ||
955 | /* dirty, undocumented hack -- pass the frame counter | ||
956 | * within the last four bytes of each vbi data block. | ||
957 | * We need that one to maintain backward compatibility | ||
958 | * to all vbi decoding software out there ... */ | ||
959 | fc = (unsigned int*)q->read_buf->dma.vmalloc; | ||
960 | fc += (q->read_buf->size>>2) -1; | ||
961 | *fc = q->read_buf->field_count >> 1; | ||
962 | dprintk(1,"vbihack: %d\n",*fc); | ||
963 | } | ||
964 | |||
965 | /* copy stuff */ | ||
966 | bytes = count; | ||
967 | if (bytes > q->read_buf->size - q->read_off) | ||
968 | bytes = q->read_buf->size - q->read_off; | ||
969 | if (copy_to_user(data + retval, | ||
970 | q->read_buf->dma.vmalloc + q->read_off, | ||
971 | bytes)) { | ||
972 | if (0 == retval) | ||
973 | retval = -EFAULT; | ||
974 | break; | ||
975 | } | ||
976 | count -= bytes; | ||
977 | retval += bytes; | ||
978 | q->read_off += bytes; | ||
979 | } else { | ||
980 | /* some error */ | ||
981 | q->read_off = q->read_buf->size; | ||
982 | if (0 == retval) | ||
983 | retval = -EIO; | ||
984 | } | ||
985 | |||
986 | /* requeue buffer when done with copying */ | ||
987 | if (q->read_off == q->read_buf->size) { | ||
988 | list_add_tail(&q->read_buf->stream, | ||
989 | &q->stream); | ||
990 | spin_lock_irqsave(q->irqlock,flags); | ||
991 | q->ops->buf_queue(q,q->read_buf); | ||
992 | spin_unlock_irqrestore(q->irqlock,flags); | ||
993 | q->read_buf = NULL; | ||
994 | } | ||
995 | if (retval < 0) | ||
996 | break; | ||
997 | } | ||
998 | |||
999 | done: | ||
1000 | up(&q->lock); | ||
1001 | return retval; | ||
1002 | } | ||
1003 | |||
1004 | unsigned int videobuf_poll_stream(struct file *file, | ||
1005 | struct videobuf_queue *q, | ||
1006 | poll_table *wait) | ||
1007 | { | ||
1008 | struct videobuf_buffer *buf = NULL; | ||
1009 | unsigned int rc = 0; | ||
1010 | |||
1011 | down(&q->lock); | ||
1012 | if (q->streaming) { | ||
1013 | if (!list_empty(&q->stream)) | ||
1014 | buf = list_entry(q->stream.next, | ||
1015 | struct videobuf_buffer, stream); | ||
1016 | } else { | ||
1017 | if (!q->reading) | ||
1018 | videobuf_read_start(q); | ||
1019 | if (!q->reading) { | ||
1020 | rc = POLLERR; | ||
1021 | } else if (NULL == q->read_buf) { | ||
1022 | q->read_buf = list_entry(q->stream.next, | ||
1023 | struct videobuf_buffer, | ||
1024 | stream); | ||
1025 | list_del(&q->read_buf->stream); | ||
1026 | q->read_off = 0; | ||
1027 | } | ||
1028 | buf = q->read_buf; | ||
1029 | } | ||
1030 | if (!buf) | ||
1031 | rc = POLLERR; | ||
1032 | |||
1033 | if (0 == rc) { | ||
1034 | poll_wait(file, &buf->done, wait); | ||
1035 | if (buf->state == STATE_DONE || | ||
1036 | buf->state == STATE_ERROR) | ||
1037 | rc = POLLIN|POLLRDNORM; | ||
1038 | } | ||
1039 | up(&q->lock); | ||
1040 | return rc; | ||
1041 | } | ||
1042 | |||
1043 | /* --------------------------------------------------------------------- */ | ||
1044 | |||
1045 | static void | ||
1046 | videobuf_vm_open(struct vm_area_struct *vma) | ||
1047 | { | ||
1048 | struct videobuf_mapping *map = vma->vm_private_data; | ||
1049 | |||
1050 | dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map, | ||
1051 | map->count,vma->vm_start,vma->vm_end); | ||
1052 | map->count++; | ||
1053 | } | ||
1054 | |||
1055 | static void | ||
1056 | videobuf_vm_close(struct vm_area_struct *vma) | ||
1057 | { | ||
1058 | struct videobuf_mapping *map = vma->vm_private_data; | ||
1059 | struct videobuf_queue *q = map->q; | ||
1060 | int i; | ||
1061 | |||
1062 | dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map, | ||
1063 | map->count,vma->vm_start,vma->vm_end); | ||
1064 | |||
1065 | map->count--; | ||
1066 | if (0 == map->count) { | ||
1067 | dprintk(1,"munmap %p q=%p\n",map,q); | ||
1068 | down(&q->lock); | ||
1069 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | ||
1070 | if (NULL == q->bufs[i]) | ||
1071 | continue; | ||
1072 | if (q->bufs[i]) | ||
1073 | ; | ||
1074 | if (q->bufs[i]->map != map) | ||
1075 | continue; | ||
1076 | q->bufs[i]->map = NULL; | ||
1077 | q->bufs[i]->baddr = 0; | ||
1078 | q->ops->buf_release(q,q->bufs[i]); | ||
1079 | } | ||
1080 | up(&q->lock); | ||
1081 | kfree(map); | ||
1082 | } | ||
1083 | return; | ||
1084 | } | ||
1085 | |||
1086 | /* | ||
1087 | * Get a anonymous page for the mapping. Make sure we can DMA to that | ||
1088 | * memory location with 32bit PCI devices (i.e. don't use highmem for | ||
1089 | * now ...). Bounce buffers don't work very well for the data rates | ||
1090 | * video capture has. | ||
1091 | */ | ||
1092 | static struct page* | ||
1093 | videobuf_vm_nopage(struct vm_area_struct *vma, unsigned long vaddr, | ||
1094 | int *type) | ||
1095 | { | ||
1096 | struct page *page; | ||
1097 | |||
1098 | dprintk(3,"nopage: fault @ %08lx [vma %08lx-%08lx]\n", | ||
1099 | vaddr,vma->vm_start,vma->vm_end); | ||
1100 | if (vaddr > vma->vm_end) | ||
1101 | return NOPAGE_SIGBUS; | ||
1102 | page = alloc_page(GFP_USER); | ||
1103 | if (!page) | ||
1104 | return NOPAGE_OOM; | ||
1105 | clear_user_page(page_address(page), vaddr, page); | ||
1106 | if (type) | ||
1107 | *type = VM_FAULT_MINOR; | ||
1108 | return page; | ||
1109 | } | ||
1110 | |||
1111 | static struct vm_operations_struct videobuf_vm_ops = | ||
1112 | { | ||
1113 | .open = videobuf_vm_open, | ||
1114 | .close = videobuf_vm_close, | ||
1115 | .nopage = videobuf_vm_nopage, | ||
1116 | }; | ||
1117 | |||
1118 | int videobuf_mmap_setup(struct videobuf_queue *q, | ||
1119 | unsigned int bcount, unsigned int bsize, | ||
1120 | enum v4l2_memory memory) | ||
1121 | { | ||
1122 | unsigned int i; | ||
1123 | int err; | ||
1124 | |||
1125 | err = videobuf_mmap_free(q); | ||
1126 | if (0 != err) | ||
1127 | return err; | ||
1128 | |||
1129 | for (i = 0; i < bcount; i++) { | ||
1130 | q->bufs[i] = videobuf_alloc(q->msize); | ||
1131 | q->bufs[i]->i = i; | ||
1132 | q->bufs[i]->input = UNSET; | ||
1133 | q->bufs[i]->memory = memory; | ||
1134 | q->bufs[i]->bsize = bsize; | ||
1135 | switch (memory) { | ||
1136 | case V4L2_MEMORY_MMAP: | ||
1137 | q->bufs[i]->boff = bsize * i; | ||
1138 | break; | ||
1139 | case V4L2_MEMORY_USERPTR: | ||
1140 | case V4L2_MEMORY_OVERLAY: | ||
1141 | /* nothing */ | ||
1142 | break; | ||
1143 | } | ||
1144 | } | ||
1145 | dprintk(1,"mmap setup: %d buffers, %d bytes each\n", | ||
1146 | bcount,bsize); | ||
1147 | return 0; | ||
1148 | } | ||
1149 | |||
1150 | int videobuf_mmap_free(struct videobuf_queue *q) | ||
1151 | { | ||
1152 | int i; | ||
1153 | |||
1154 | for (i = 0; i < VIDEO_MAX_FRAME; i++) | ||
1155 | if (q->bufs[i] && q->bufs[i]->map) | ||
1156 | return -EBUSY; | ||
1157 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | ||
1158 | if (NULL == q->bufs[i]) | ||
1159 | continue; | ||
1160 | q->ops->buf_release(q,q->bufs[i]); | ||
1161 | kfree(q->bufs[i]); | ||
1162 | q->bufs[i] = NULL; | ||
1163 | } | ||
1164 | return 0; | ||
1165 | } | ||
1166 | |||
1167 | int videobuf_mmap_mapper(struct videobuf_queue *q, | ||
1168 | struct vm_area_struct *vma) | ||
1169 | { | ||
1170 | struct videobuf_mapping *map; | ||
1171 | unsigned int first,last,size,i; | ||
1172 | int retval; | ||
1173 | |||
1174 | down(&q->lock); | ||
1175 | retval = -EINVAL; | ||
1176 | if (!(vma->vm_flags & VM_WRITE)) { | ||
1177 | dprintk(1,"mmap app bug: PROT_WRITE please\n"); | ||
1178 | goto done; | ||
1179 | } | ||
1180 | if (!(vma->vm_flags & VM_SHARED)) { | ||
1181 | dprintk(1,"mmap app bug: MAP_SHARED please\n"); | ||
1182 | goto done; | ||
1183 | } | ||
1184 | |||
1185 | /* look for first buffer to map */ | ||
1186 | for (first = 0; first < VIDEO_MAX_FRAME; first++) { | ||
1187 | if (NULL == q->bufs[first]) | ||
1188 | continue; | ||
1189 | if (V4L2_MEMORY_MMAP != q->bufs[first]->memory) | ||
1190 | continue; | ||
1191 | if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT)) | ||
1192 | break; | ||
1193 | } | ||
1194 | if (VIDEO_MAX_FRAME == first) { | ||
1195 | dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n", | ||
1196 | (vma->vm_pgoff << PAGE_SHIFT)); | ||
1197 | goto done; | ||
1198 | } | ||
1199 | |||
1200 | /* look for last buffer to map */ | ||
1201 | for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) { | ||
1202 | if (NULL == q->bufs[last]) | ||
1203 | continue; | ||
1204 | if (V4L2_MEMORY_MMAP != q->bufs[last]->memory) | ||
1205 | continue; | ||
1206 | if (q->bufs[last]->map) { | ||
1207 | retval = -EBUSY; | ||
1208 | goto done; | ||
1209 | } | ||
1210 | size += q->bufs[last]->bsize; | ||
1211 | if (size == (vma->vm_end - vma->vm_start)) | ||
1212 | break; | ||
1213 | } | ||
1214 | if (VIDEO_MAX_FRAME == last) { | ||
1215 | dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n", | ||
1216 | (vma->vm_end - vma->vm_start)); | ||
1217 | goto done; | ||
1218 | } | ||
1219 | |||
1220 | /* create mapping + update buffer list */ | ||
1221 | retval = -ENOMEM; | ||
1222 | map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL); | ||
1223 | if (NULL == map) | ||
1224 | goto done; | ||
1225 | for (size = 0, i = first; i <= last; size += q->bufs[i++]->bsize) { | ||
1226 | q->bufs[i]->map = map; | ||
1227 | q->bufs[i]->baddr = vma->vm_start + size; | ||
1228 | } | ||
1229 | map->count = 1; | ||
1230 | map->start = vma->vm_start; | ||
1231 | map->end = vma->vm_end; | ||
1232 | map->q = q; | ||
1233 | vma->vm_ops = &videobuf_vm_ops; | ||
1234 | vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED; | ||
1235 | vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */ | ||
1236 | vma->vm_private_data = map; | ||
1237 | dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n", | ||
1238 | map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last); | ||
1239 | retval = 0; | ||
1240 | |||
1241 | done: | ||
1242 | up(&q->lock); | ||
1243 | return retval; | ||
1244 | } | ||
1245 | |||
1246 | /* --------------------------------------------------------------------- */ | ||
1247 | |||
1248 | EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg); | ||
1249 | |||
1250 | EXPORT_SYMBOL_GPL(videobuf_dma_init); | ||
1251 | EXPORT_SYMBOL_GPL(videobuf_dma_init_user); | ||
1252 | EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel); | ||
1253 | EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay); | ||
1254 | EXPORT_SYMBOL_GPL(videobuf_dma_pci_map); | ||
1255 | EXPORT_SYMBOL_GPL(videobuf_dma_pci_sync); | ||
1256 | EXPORT_SYMBOL_GPL(videobuf_dma_pci_unmap); | ||
1257 | EXPORT_SYMBOL_GPL(videobuf_dma_free); | ||
1258 | |||
1259 | EXPORT_SYMBOL_GPL(videobuf_alloc); | ||
1260 | EXPORT_SYMBOL_GPL(videobuf_waiton); | ||
1261 | EXPORT_SYMBOL_GPL(videobuf_iolock); | ||
1262 | |||
1263 | EXPORT_SYMBOL_GPL(videobuf_queue_init); | ||
1264 | EXPORT_SYMBOL_GPL(videobuf_queue_cancel); | ||
1265 | EXPORT_SYMBOL_GPL(videobuf_queue_is_busy); | ||
1266 | |||
1267 | EXPORT_SYMBOL_GPL(videobuf_next_field); | ||
1268 | EXPORT_SYMBOL_GPL(videobuf_status); | ||
1269 | EXPORT_SYMBOL_GPL(videobuf_reqbufs); | ||
1270 | EXPORT_SYMBOL_GPL(videobuf_querybuf); | ||
1271 | EXPORT_SYMBOL_GPL(videobuf_qbuf); | ||
1272 | EXPORT_SYMBOL_GPL(videobuf_dqbuf); | ||
1273 | EXPORT_SYMBOL_GPL(videobuf_streamon); | ||
1274 | EXPORT_SYMBOL_GPL(videobuf_streamoff); | ||
1275 | |||
1276 | EXPORT_SYMBOL_GPL(videobuf_read_start); | ||
1277 | EXPORT_SYMBOL_GPL(videobuf_read_stop); | ||
1278 | EXPORT_SYMBOL_GPL(videobuf_read_stream); | ||
1279 | EXPORT_SYMBOL_GPL(videobuf_read_one); | ||
1280 | EXPORT_SYMBOL_GPL(videobuf_poll_stream); | ||
1281 | |||
1282 | EXPORT_SYMBOL_GPL(videobuf_mmap_setup); | ||
1283 | EXPORT_SYMBOL_GPL(videobuf_mmap_free); | ||
1284 | EXPORT_SYMBOL_GPL(videobuf_mmap_mapper); | ||
1285 | |||
1286 | /* | ||
1287 | * Local variables: | ||
1288 | * c-basic-offset: 8 | ||
1289 | * End: | ||
1290 | */ | ||