Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * |
3 | * generic helper functions for video4linux capture buffers, to handle | |
4 | * memory management and PCI DMA. Right now bttv + saa7134 use it. | |
5 | * | |
6 | * The functions expect the hardware being able to scatter gatter | |
7 | * (i.e. the buffers are not linear in physical memory, but fragmented | |
8 | * into PAGE_SIZE chunks). They also assume the driver does not need | |
9 | * to touch the video data (thus it is probably not useful for USB 1.1 | |
10 | * as data often must be uncompressed by the drivers). | |
11 | * | |
12 | * (c) 2001-2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs] | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2 of the License, or | |
17 | * (at your option) any later version. | |
18 | */ | |
19 | ||
20 | #include <linux/init.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/moduleparam.h> | |
23 | #include <linux/vmalloc.h> | |
24 | #include <linux/pagemap.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/pci.h> | |
27 | #include <linux/interrupt.h> | |
28 | #include <asm/page.h> | |
29 | #include <asm/pgtable.h> | |
30 | ||
31 | #include <media/video-buf.h> | |
32 | ||
33 | #define MAGIC_DMABUF 0x19721112 | |
34 | #define MAGIC_BUFFER 0x20040302 | |
35 | #define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \ | |
36 | { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); } | |
37 | ||
38 | static int debug = 0; | |
39 | module_param(debug, int, 0644); | |
40 | ||
41 | MODULE_DESCRIPTION("helper module to manage video4linux pci dma buffers"); | |
42 | MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]"); | |
43 | MODULE_LICENSE("GPL"); | |
44 | ||
45 | #define dprintk(level, fmt, arg...) if (debug >= level) \ | |
46 | printk(KERN_DEBUG "vbuf: " fmt , ## arg) | |
47 | ||
48 | struct scatterlist* | |
49 | videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages) | |
50 | { | |
51 | struct scatterlist *sglist; | |
52 | struct page *pg; | |
53 | int i; | |
54 | ||
55 | sglist = kmalloc(sizeof(struct scatterlist)*nr_pages, GFP_KERNEL); | |
56 | if (NULL == sglist) | |
57 | return NULL; | |
58 | memset(sglist,0,sizeof(struct scatterlist)*nr_pages); | |
59 | for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) { | |
60 | pg = vmalloc_to_page(virt); | |
61 | if (NULL == pg) | |
62 | goto err; | |
63 | if (PageHighMem(pg)) | |
64 | BUG(); | |
65 | sglist[i].page = pg; | |
66 | sglist[i].length = PAGE_SIZE; | |
67 | } | |
68 | return sglist; | |
69 | ||
70 | err: | |
71 | kfree(sglist); | |
72 | return NULL; | |
73 | } | |
74 | ||
75 | struct scatterlist* | |
76 | videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset) | |
77 | { | |
78 | struct scatterlist *sglist; | |
79 | int i = 0; | |
80 | ||
81 | if (NULL == pages[0]) | |
82 | return NULL; | |
83 | sglist = kmalloc(sizeof(*sglist) * nr_pages, GFP_KERNEL); | |
84 | if (NULL == sglist) | |
85 | return NULL; | |
86 | memset(sglist, 0, sizeof(*sglist) * nr_pages); | |
87 | ||
88 | if (NULL == pages[0]) | |
89 | goto nopage; | |
90 | if (PageHighMem(pages[0])) | |
91 | /* DMA to highmem pages might not work */ | |
92 | goto highmem; | |
93 | sglist[0].page = pages[0]; | |
94 | sglist[0].offset = offset; | |
95 | sglist[0].length = PAGE_SIZE - offset; | |
96 | for (i = 1; i < nr_pages; i++) { | |
97 | if (NULL == pages[i]) | |
98 | goto nopage; | |
99 | if (PageHighMem(pages[i])) | |
100 | goto highmem; | |
101 | sglist[i].page = pages[i]; | |
102 | sglist[i].length = PAGE_SIZE; | |
103 | } | |
104 | return sglist; | |
105 | ||
106 | nopage: | |
107 | dprintk(2,"sgl: oops - no page\n"); | |
108 | kfree(sglist); | |
109 | return NULL; | |
110 | ||
111 | highmem: | |
112 | dprintk(2,"sgl: oops - highmem page\n"); | |
113 | kfree(sglist); | |
114 | return NULL; | |
115 | } | |
116 | ||
117 | /* --------------------------------------------------------------------- */ | |
118 | ||
119 | void videobuf_dma_init(struct videobuf_dmabuf *dma) | |
120 | { | |
121 | memset(dma,0,sizeof(*dma)); | |
122 | dma->magic = MAGIC_DMABUF; | |
123 | } | |
124 | ||
125 | int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction, | |
126 | unsigned long data, unsigned long size) | |
127 | { | |
128 | unsigned long first,last; | |
129 | int err, rw = 0; | |
130 | ||
131 | dma->direction = direction; | |
132 | switch (dma->direction) { | |
133 | case PCI_DMA_FROMDEVICE: rw = READ; break; | |
134 | case PCI_DMA_TODEVICE: rw = WRITE; break; | |
135 | default: BUG(); | |
136 | } | |
137 | ||
138 | first = (data & PAGE_MASK) >> PAGE_SHIFT; | |
139 | last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT; | |
140 | dma->offset = data & ~PAGE_MASK; | |
141 | dma->nr_pages = last-first+1; | |
142 | dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*), | |
143 | GFP_KERNEL); | |
144 | if (NULL == dma->pages) | |
145 | return -ENOMEM; | |
146 | dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n", | |
147 | data,size,dma->nr_pages); | |
148 | ||
149 | down_read(¤t->mm->mmap_sem); | |
150 | err = get_user_pages(current,current->mm, | |
151 | data & PAGE_MASK, dma->nr_pages, | |
152 | rw == READ, 1, /* force */ | |
153 | dma->pages, NULL); | |
154 | up_read(¤t->mm->mmap_sem); | |
155 | if (err != dma->nr_pages) { | |
156 | dma->nr_pages = (err >= 0) ? err : 0; | |
157 | dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages); | |
158 | return err < 0 ? err : -EINVAL; | |
159 | } | |
160 | return 0; | |
161 | } | |
162 | ||
163 | int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction, | |
164 | int nr_pages) | |
165 | { | |
166 | dprintk(1,"init kernel [%d pages]\n",nr_pages); | |
167 | dma->direction = direction; | |
168 | dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT); | |
169 | if (NULL == dma->vmalloc) { | |
170 | dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages); | |
171 | return -ENOMEM; | |
172 | } | |
173 | memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT); | |
174 | dma->nr_pages = nr_pages; | |
175 | return 0; | |
176 | } | |
177 | ||
178 | int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction, | |
179 | dma_addr_t addr, int nr_pages) | |
180 | { | |
181 | dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n", | |
182 | nr_pages,(unsigned long)addr); | |
183 | dma->direction = direction; | |
184 | if (0 == addr) | |
185 | return -EINVAL; | |
186 | ||
187 | dma->bus_addr = addr; | |
188 | dma->nr_pages = nr_pages; | |
189 | return 0; | |
190 | } | |
191 | ||
192 | int videobuf_dma_pci_map(struct pci_dev *dev, struct videobuf_dmabuf *dma) | |
193 | { | |
194 | MAGIC_CHECK(dma->magic,MAGIC_DMABUF); | |
195 | BUG_ON(0 == dma->nr_pages); | |
196 | ||
197 | if (dma->pages) { | |
198 | dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages, | |
199 | dma->offset); | |
200 | } | |
201 | if (dma->vmalloc) { | |
202 | dma->sglist = videobuf_vmalloc_to_sg | |
203 | (dma->vmalloc,dma->nr_pages); | |
204 | } | |
205 | if (dma->bus_addr) { | |
206 | dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL); | |
207 | if (NULL != dma->sglist) { | |
208 | dma->sglen = 1; | |
209 | sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK; | |
210 | dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK; | |
211 | sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE; | |
212 | } | |
213 | } | |
214 | if (NULL == dma->sglist) { | |
215 | dprintk(1,"scatterlist is NULL\n"); | |
216 | return -ENOMEM; | |
217 | } | |
218 | ||
219 | if (!dma->bus_addr) { | |
220 | dma->sglen = pci_map_sg(dev,dma->sglist,dma->nr_pages, | |
221 | dma->direction); | |
222 | if (0 == dma->sglen) { | |
223 | printk(KERN_WARNING | |
224 | "%s: pci_map_sg failed\n",__FUNCTION__); | |
225 | kfree(dma->sglist); | |
226 | dma->sglist = NULL; | |
227 | dma->sglen = 0; | |
228 | return -EIO; | |
229 | } | |
230 | } | |
231 | return 0; | |
232 | } | |
233 | ||
234 | int videobuf_dma_pci_sync(struct pci_dev *dev, struct videobuf_dmabuf *dma) | |
235 | { | |
236 | MAGIC_CHECK(dma->magic,MAGIC_DMABUF); | |
237 | BUG_ON(!dma->sglen); | |
238 | ||
239 | if (!dma->bus_addr) | |
240 | pci_dma_sync_sg_for_cpu(dev,dma->sglist,dma->nr_pages,dma->direction); | |
241 | return 0; | |
242 | } | |
243 | ||
244 | int videobuf_dma_pci_unmap(struct pci_dev *dev, struct videobuf_dmabuf *dma) | |
245 | { | |
246 | MAGIC_CHECK(dma->magic,MAGIC_DMABUF); | |
247 | if (!dma->sglen) | |
248 | return 0; | |
249 | ||
250 | if (!dma->bus_addr) | |
251 | pci_unmap_sg(dev,dma->sglist,dma->nr_pages,dma->direction); | |
252 | kfree(dma->sglist); | |
253 | dma->sglist = NULL; | |
254 | dma->sglen = 0; | |
255 | return 0; | |
256 | } | |
257 | ||
258 | int videobuf_dma_free(struct videobuf_dmabuf *dma) | |
259 | { | |
260 | MAGIC_CHECK(dma->magic,MAGIC_DMABUF); | |
261 | BUG_ON(dma->sglen); | |
262 | ||
263 | if (dma->pages) { | |
264 | int i; | |
265 | for (i=0; i < dma->nr_pages; i++) | |
266 | page_cache_release(dma->pages[i]); | |
267 | kfree(dma->pages); | |
268 | dma->pages = NULL; | |
269 | } | |
f9101210 JJ |
270 | |
271 | vfree(dma->vmalloc); | |
272 | dma->vmalloc = NULL; | |
273 | ||
1da177e4 LT |
274 | if (dma->bus_addr) { |
275 | dma->bus_addr = 0; | |
276 | } | |
277 | dma->direction = PCI_DMA_NONE; | |
278 | return 0; | |
279 | } | |
280 | ||
281 | /* --------------------------------------------------------------------- */ | |
282 | ||
283 | void* videobuf_alloc(unsigned int size) | |
284 | { | |
285 | struct videobuf_buffer *vb; | |
286 | ||
287 | vb = kmalloc(size,GFP_KERNEL); | |
288 | if (NULL != vb) { | |
289 | memset(vb,0,size); | |
290 | videobuf_dma_init(&vb->dma); | |
291 | init_waitqueue_head(&vb->done); | |
292 | vb->magic = MAGIC_BUFFER; | |
293 | } | |
294 | return vb; | |
295 | } | |
296 | ||
297 | int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr) | |
298 | { | |
299 | int retval = 0; | |
300 | DECLARE_WAITQUEUE(wait, current); | |
301 | ||
302 | MAGIC_CHECK(vb->magic,MAGIC_BUFFER); | |
303 | add_wait_queue(&vb->done, &wait); | |
304 | while (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) { | |
305 | if (non_blocking) { | |
306 | retval = -EAGAIN; | |
307 | break; | |
308 | } | |
309 | set_current_state(intr ? TASK_INTERRUPTIBLE | |
310 | : TASK_UNINTERRUPTIBLE); | |
311 | if (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) | |
312 | schedule(); | |
313 | set_current_state(TASK_RUNNING); | |
314 | if (intr && signal_pending(current)) { | |
315 | dprintk(1,"buffer waiton: -EINTR\n"); | |
316 | retval = -EINTR; | |
317 | break; | |
318 | } | |
319 | } | |
320 | remove_wait_queue(&vb->done, &wait); | |
321 | return retval; | |
322 | } | |
323 | ||
324 | int | |
325 | videobuf_iolock(struct pci_dev *pci, struct videobuf_buffer *vb, | |
326 | struct v4l2_framebuffer *fbuf) | |
327 | { | |
328 | int err,pages; | |
329 | dma_addr_t bus; | |
330 | ||
331 | MAGIC_CHECK(vb->magic,MAGIC_BUFFER); | |
332 | switch (vb->memory) { | |
333 | case V4L2_MEMORY_MMAP: | |
334 | case V4L2_MEMORY_USERPTR: | |
335 | if (0 == vb->baddr) { | |
336 | /* no userspace addr -- kernel bounce buffer */ | |
337 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
338 | err = videobuf_dma_init_kernel(&vb->dma,PCI_DMA_FROMDEVICE, | |
339 | pages); | |
340 | if (0 != err) | |
341 | return err; | |
342 | } else { | |
343 | /* dma directly to userspace */ | |
344 | err = videobuf_dma_init_user(&vb->dma,PCI_DMA_FROMDEVICE, | |
345 | vb->baddr,vb->bsize); | |
346 | if (0 != err) | |
347 | return err; | |
348 | } | |
349 | break; | |
350 | case V4L2_MEMORY_OVERLAY: | |
351 | if (NULL == fbuf) | |
352 | return -EINVAL; | |
353 | /* FIXME: need sanity checks for vb->boff */ | |
354 | bus = (dma_addr_t)fbuf->base + vb->boff; | |
355 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
356 | err = videobuf_dma_init_overlay(&vb->dma,PCI_DMA_FROMDEVICE, | |
357 | bus, pages); | |
358 | if (0 != err) | |
359 | return err; | |
360 | break; | |
361 | default: | |
362 | BUG(); | |
363 | } | |
364 | err = videobuf_dma_pci_map(pci,&vb->dma); | |
365 | if (0 != err) | |
366 | return err; | |
367 | ||
368 | return 0; | |
369 | } | |
370 | ||
371 | /* --------------------------------------------------------------------- */ | |
372 | ||
373 | void videobuf_queue_init(struct videobuf_queue* q, | |
374 | struct videobuf_queue_ops *ops, | |
375 | struct pci_dev *pci, | |
376 | spinlock_t *irqlock, | |
377 | enum v4l2_buf_type type, | |
378 | enum v4l2_field field, | |
379 | unsigned int msize, | |
380 | void *priv) | |
381 | { | |
382 | memset(q,0,sizeof(*q)); | |
383 | q->irqlock = irqlock; | |
384 | q->pci = pci; | |
385 | q->type = type; | |
386 | q->field = field; | |
387 | q->msize = msize; | |
388 | q->ops = ops; | |
389 | q->priv_data = priv; | |
390 | ||
391 | init_MUTEX(&q->lock); | |
392 | INIT_LIST_HEAD(&q->stream); | |
393 | } | |
394 | ||
395 | int | |
396 | videobuf_queue_is_busy(struct videobuf_queue *q) | |
397 | { | |
398 | int i; | |
399 | ||
400 | if (q->streaming) { | |
401 | dprintk(1,"busy: streaming active\n"); | |
402 | return 1; | |
403 | } | |
404 | if (q->reading) { | |
405 | dprintk(1,"busy: pending read #1\n"); | |
406 | return 1; | |
407 | } | |
408 | if (q->read_buf) { | |
409 | dprintk(1,"busy: pending read #2\n"); | |
410 | return 1; | |
411 | } | |
412 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
413 | if (NULL == q->bufs[i]) | |
414 | continue; | |
415 | if (q->bufs[i]->map) { | |
416 | dprintk(1,"busy: buffer #%d mapped\n",i); | |
417 | return 1; | |
418 | } | |
419 | if (q->bufs[i]->state == STATE_QUEUED) { | |
420 | dprintk(1,"busy: buffer #%d queued\n",i); | |
421 | return 1; | |
422 | } | |
423 | if (q->bufs[i]->state == STATE_ACTIVE) { | |
424 | dprintk(1,"busy: buffer #%d avtive\n",i); | |
425 | return 1; | |
426 | } | |
427 | } | |
428 | return 0; | |
429 | } | |
430 | ||
431 | void | |
432 | videobuf_queue_cancel(struct videobuf_queue *q) | |
433 | { | |
434 | unsigned long flags; | |
435 | int i; | |
436 | ||
437 | /* remove queued buffers from list */ | |
438 | spin_lock_irqsave(q->irqlock,flags); | |
439 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
440 | if (NULL == q->bufs[i]) | |
441 | continue; | |
442 | if (q->bufs[i]->state == STATE_QUEUED) { | |
443 | list_del(&q->bufs[i]->queue); | |
444 | q->bufs[i]->state = STATE_ERROR; | |
445 | } | |
446 | } | |
447 | spin_unlock_irqrestore(q->irqlock,flags); | |
448 | ||
449 | /* free all buffers + clear queue */ | |
450 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
451 | if (NULL == q->bufs[i]) | |
452 | continue; | |
453 | q->ops->buf_release(q,q->bufs[i]); | |
454 | } | |
455 | INIT_LIST_HEAD(&q->stream); | |
456 | } | |
457 | ||
458 | /* --------------------------------------------------------------------- */ | |
459 | ||
460 | enum v4l2_field | |
461 | videobuf_next_field(struct videobuf_queue *q) | |
462 | { | |
463 | enum v4l2_field field = q->field; | |
464 | ||
465 | BUG_ON(V4L2_FIELD_ANY == field); | |
466 | ||
467 | if (V4L2_FIELD_ALTERNATE == field) { | |
468 | if (V4L2_FIELD_TOP == q->last) { | |
469 | field = V4L2_FIELD_BOTTOM; | |
470 | q->last = V4L2_FIELD_BOTTOM; | |
471 | } else { | |
472 | field = V4L2_FIELD_TOP; | |
473 | q->last = V4L2_FIELD_TOP; | |
474 | } | |
475 | } | |
476 | return field; | |
477 | } | |
478 | ||
479 | void | |
480 | videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb, | |
481 | enum v4l2_buf_type type) | |
482 | { | |
483 | MAGIC_CHECK(vb->magic,MAGIC_BUFFER); | |
484 | ||
485 | b->index = vb->i; | |
486 | b->type = type; | |
487 | ||
488 | b->memory = vb->memory; | |
489 | switch (b->memory) { | |
490 | case V4L2_MEMORY_MMAP: | |
491 | b->m.offset = vb->boff; | |
492 | b->length = vb->bsize; | |
493 | break; | |
494 | case V4L2_MEMORY_USERPTR: | |
495 | b->m.userptr = vb->baddr; | |
496 | b->length = vb->bsize; | |
497 | break; | |
498 | case V4L2_MEMORY_OVERLAY: | |
499 | b->m.offset = vb->boff; | |
500 | break; | |
501 | } | |
502 | ||
503 | b->flags = 0; | |
504 | if (vb->map) | |
505 | b->flags |= V4L2_BUF_FLAG_MAPPED; | |
506 | ||
507 | switch (vb->state) { | |
508 | case STATE_PREPARED: | |
509 | case STATE_QUEUED: | |
510 | case STATE_ACTIVE: | |
511 | b->flags |= V4L2_BUF_FLAG_QUEUED; | |
512 | break; | |
513 | case STATE_DONE: | |
514 | case STATE_ERROR: | |
515 | b->flags |= V4L2_BUF_FLAG_DONE; | |
516 | break; | |
517 | case STATE_NEEDS_INIT: | |
518 | case STATE_IDLE: | |
519 | /* nothing */ | |
520 | break; | |
521 | } | |
522 | ||
523 | if (vb->input != UNSET) { | |
524 | b->flags |= V4L2_BUF_FLAG_INPUT; | |
525 | b->input = vb->input; | |
526 | } | |
527 | ||
528 | b->field = vb->field; | |
529 | b->timestamp = vb->ts; | |
530 | b->bytesused = vb->size; | |
531 | b->sequence = vb->field_count >> 1; | |
532 | } | |
533 | ||
534 | int | |
535 | videobuf_reqbufs(struct videobuf_queue *q, | |
536 | struct v4l2_requestbuffers *req) | |
537 | { | |
538 | unsigned int size,count; | |
539 | int retval; | |
540 | ||
541 | if (req->type != q->type) | |
542 | return -EINVAL; | |
543 | if (req->count < 1) | |
544 | return -EINVAL; | |
545 | if (req->memory != V4L2_MEMORY_MMAP && | |
546 | req->memory != V4L2_MEMORY_USERPTR && | |
547 | req->memory != V4L2_MEMORY_OVERLAY) | |
548 | return -EINVAL; | |
549 | ||
550 | if (q->streaming) | |
551 | return -EBUSY; | |
552 | if (!list_empty(&q->stream)) | |
553 | return -EBUSY; | |
554 | ||
555 | down(&q->lock); | |
556 | count = req->count; | |
557 | if (count > VIDEO_MAX_FRAME) | |
558 | count = VIDEO_MAX_FRAME; | |
559 | size = 0; | |
560 | q->ops->buf_setup(q,&count,&size); | |
561 | size = PAGE_ALIGN(size); | |
562 | dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n", | |
563 | count, size, (count*size)>>PAGE_SHIFT); | |
564 | ||
565 | retval = videobuf_mmap_setup(q,count,size,req->memory); | |
566 | if (retval < 0) | |
567 | goto done; | |
568 | ||
569 | req->count = count; | |
570 | ||
571 | done: | |
572 | up(&q->lock); | |
573 | return retval; | |
574 | } | |
575 | ||
576 | int | |
577 | videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b) | |
578 | { | |
579 | if (unlikely(b->type != q->type)) | |
580 | return -EINVAL; | |
581 | if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) | |
582 | return -EINVAL; | |
583 | if (unlikely(NULL == q->bufs[b->index])) | |
584 | return -EINVAL; | |
585 | videobuf_status(b,q->bufs[b->index],q->type); | |
586 | return 0; | |
587 | } | |
588 | ||
589 | int | |
590 | videobuf_qbuf(struct videobuf_queue *q, | |
591 | struct v4l2_buffer *b) | |
592 | { | |
593 | struct videobuf_buffer *buf; | |
594 | enum v4l2_field field; | |
595 | unsigned long flags; | |
596 | int retval; | |
597 | ||
598 | down(&q->lock); | |
599 | retval = -EBUSY; | |
600 | if (q->reading) | |
601 | goto done; | |
602 | retval = -EINVAL; | |
603 | if (b->type != q->type) | |
604 | goto done; | |
605 | if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) | |
606 | goto done; | |
607 | buf = q->bufs[b->index]; | |
608 | if (NULL == buf) | |
609 | goto done; | |
610 | MAGIC_CHECK(buf->magic,MAGIC_BUFFER); | |
611 | if (buf->memory != b->memory) | |
612 | goto done; | |
613 | if (buf->state == STATE_QUEUED || | |
614 | buf->state == STATE_ACTIVE) | |
615 | goto done; | |
616 | ||
617 | if (b->flags & V4L2_BUF_FLAG_INPUT) { | |
618 | if (b->input >= q->inputs) | |
619 | goto done; | |
620 | buf->input = b->input; | |
621 | } else { | |
622 | buf->input = UNSET; | |
623 | } | |
624 | ||
625 | switch (b->memory) { | |
626 | case V4L2_MEMORY_MMAP: | |
627 | if (0 == buf->baddr) | |
628 | goto done; | |
629 | break; | |
630 | case V4L2_MEMORY_USERPTR: | |
631 | if (b->length < buf->bsize) | |
632 | goto done; | |
633 | if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr) | |
634 | q->ops->buf_release(q,buf); | |
635 | buf->baddr = b->m.userptr; | |
636 | break; | |
637 | case V4L2_MEMORY_OVERLAY: | |
638 | buf->boff = b->m.offset; | |
639 | break; | |
640 | default: | |
641 | goto done; | |
642 | } | |
643 | ||
644 | field = videobuf_next_field(q); | |
645 | retval = q->ops->buf_prepare(q,buf,field); | |
646 | if (0 != retval) | |
647 | goto done; | |
648 | ||
649 | list_add_tail(&buf->stream,&q->stream); | |
650 | if (q->streaming) { | |
651 | spin_lock_irqsave(q->irqlock,flags); | |
652 | q->ops->buf_queue(q,buf); | |
653 | spin_unlock_irqrestore(q->irqlock,flags); | |
654 | } | |
655 | retval = 0; | |
656 | ||
657 | done: | |
658 | up(&q->lock); | |
659 | return retval; | |
660 | } | |
661 | ||
662 | int | |
663 | videobuf_dqbuf(struct videobuf_queue *q, | |
664 | struct v4l2_buffer *b, int nonblocking) | |
665 | { | |
666 | struct videobuf_buffer *buf; | |
667 | int retval; | |
668 | ||
669 | down(&q->lock); | |
670 | retval = -EBUSY; | |
671 | if (q->reading) | |
672 | goto done; | |
673 | retval = -EINVAL; | |
674 | if (b->type != q->type) | |
675 | goto done; | |
676 | if (list_empty(&q->stream)) | |
677 | goto done; | |
678 | buf = list_entry(q->stream.next, struct videobuf_buffer, stream); | |
679 | retval = videobuf_waiton(buf, nonblocking, 1); | |
680 | if (retval < 0) | |
681 | goto done; | |
682 | switch (buf->state) { | |
683 | case STATE_ERROR: | |
684 | retval = -EIO; | |
685 | /* fall through */ | |
686 | case STATE_DONE: | |
687 | videobuf_dma_pci_sync(q->pci,&buf->dma); | |
688 | buf->state = STATE_IDLE; | |
689 | break; | |
690 | default: | |
691 | retval = -EINVAL; | |
692 | goto done; | |
693 | } | |
694 | list_del(&buf->stream); | |
695 | memset(b,0,sizeof(*b)); | |
696 | videobuf_status(b,buf,q->type); | |
697 | ||
698 | done: | |
699 | up(&q->lock); | |
700 | return retval; | |
701 | } | |
702 | ||
703 | int videobuf_streamon(struct videobuf_queue *q) | |
704 | { | |
705 | struct videobuf_buffer *buf; | |
706 | struct list_head *list; | |
707 | unsigned long flags; | |
708 | int retval; | |
709 | ||
710 | down(&q->lock); | |
711 | retval = -EBUSY; | |
712 | if (q->reading) | |
713 | goto done; | |
714 | retval = 0; | |
715 | if (q->streaming) | |
716 | goto done; | |
717 | q->streaming = 1; | |
718 | spin_lock_irqsave(q->irqlock,flags); | |
719 | list_for_each(list,&q->stream) { | |
720 | buf = list_entry(list, struct videobuf_buffer, stream); | |
721 | if (buf->state == STATE_PREPARED) | |
722 | q->ops->buf_queue(q,buf); | |
723 | } | |
724 | spin_unlock_irqrestore(q->irqlock,flags); | |
725 | ||
726 | done: | |
727 | up(&q->lock); | |
728 | return retval; | |
729 | } | |
730 | ||
731 | int videobuf_streamoff(struct videobuf_queue *q) | |
732 | { | |
733 | int retval = -EINVAL; | |
734 | ||
735 | down(&q->lock); | |
736 | if (!q->streaming) | |
737 | goto done; | |
738 | videobuf_queue_cancel(q); | |
739 | q->streaming = 0; | |
740 | retval = 0; | |
741 | ||
742 | done: | |
743 | up(&q->lock); | |
744 | return retval; | |
745 | } | |
746 | ||
747 | static ssize_t | |
748 | videobuf_read_zerocopy(struct videobuf_queue *q, char __user *data, | |
749 | size_t count, loff_t *ppos) | |
750 | { | |
751 | enum v4l2_field field; | |
752 | unsigned long flags; | |
753 | int retval; | |
754 | ||
755 | /* setup stuff */ | |
756 | retval = -ENOMEM; | |
757 | q->read_buf = videobuf_alloc(q->msize); | |
758 | if (NULL == q->read_buf) | |
759 | goto done; | |
760 | ||
761 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
762 | q->read_buf->baddr = (unsigned long)data; | |
763 | q->read_buf->bsize = count; | |
764 | field = videobuf_next_field(q); | |
765 | retval = q->ops->buf_prepare(q,q->read_buf,field); | |
766 | if (0 != retval) | |
767 | goto done; | |
768 | ||
769 | /* start capture & wait */ | |
770 | spin_lock_irqsave(q->irqlock,flags); | |
771 | q->ops->buf_queue(q,q->read_buf); | |
772 | spin_unlock_irqrestore(q->irqlock,flags); | |
773 | retval = videobuf_waiton(q->read_buf,0,0); | |
774 | if (0 == retval) { | |
775 | videobuf_dma_pci_sync(q->pci,&q->read_buf->dma); | |
776 | if (STATE_ERROR == q->read_buf->state) | |
777 | retval = -EIO; | |
778 | else | |
779 | retval = q->read_buf->size; | |
780 | } | |
781 | ||
782 | done: | |
783 | /* cleanup */ | |
784 | q->ops->buf_release(q,q->read_buf); | |
785 | kfree(q->read_buf); | |
786 | q->read_buf = NULL; | |
787 | return retval; | |
788 | } | |
789 | ||
790 | ssize_t videobuf_read_one(struct videobuf_queue *q, | |
791 | char __user *data, size_t count, loff_t *ppos, | |
792 | int nonblocking) | |
793 | { | |
794 | enum v4l2_field field; | |
795 | unsigned long flags; | |
796 | unsigned size, nbufs, bytes; | |
797 | int retval; | |
798 | ||
799 | down(&q->lock); | |
800 | ||
801 | nbufs = 1; size = 0; | |
802 | q->ops->buf_setup(q,&nbufs,&size); | |
803 | if (NULL == q->read_buf && | |
804 | count >= size && | |
805 | !nonblocking) { | |
806 | retval = videobuf_read_zerocopy(q,data,count,ppos); | |
807 | if (retval >= 0 || retval == -EIO) | |
808 | /* ok, all done */ | |
809 | goto done; | |
810 | /* fallback to kernel bounce buffer on failures */ | |
811 | } | |
812 | ||
813 | if (NULL == q->read_buf) { | |
814 | /* need to capture a new frame */ | |
815 | retval = -ENOMEM; | |
816 | q->read_buf = videobuf_alloc(q->msize); | |
817 | if (NULL == q->read_buf) | |
818 | goto done; | |
819 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
820 | field = videobuf_next_field(q); | |
821 | retval = q->ops->buf_prepare(q,q->read_buf,field); | |
822 | if (0 != retval) | |
823 | goto done; | |
824 | spin_lock_irqsave(q->irqlock,flags); | |
825 | q->ops->buf_queue(q,q->read_buf); | |
826 | spin_unlock_irqrestore(q->irqlock,flags); | |
827 | q->read_off = 0; | |
828 | } | |
829 | ||
830 | /* wait until capture is done */ | |
831 | retval = videobuf_waiton(q->read_buf, nonblocking, 1); | |
832 | if (0 != retval) | |
833 | goto done; | |
834 | videobuf_dma_pci_sync(q->pci,&q->read_buf->dma); | |
835 | ||
836 | if (STATE_ERROR == q->read_buf->state) { | |
837 | /* catch I/O errors */ | |
838 | q->ops->buf_release(q,q->read_buf); | |
839 | kfree(q->read_buf); | |
840 | q->read_buf = NULL; | |
841 | retval = -EIO; | |
842 | goto done; | |
843 | } | |
844 | ||
845 | /* copy to userspace */ | |
846 | bytes = count; | |
847 | if (bytes > q->read_buf->size - q->read_off) | |
848 | bytes = q->read_buf->size - q->read_off; | |
849 | retval = -EFAULT; | |
850 | if (copy_to_user(data, q->read_buf->dma.vmalloc+q->read_off, bytes)) | |
851 | goto done; | |
852 | ||
853 | retval = bytes; | |
854 | q->read_off += bytes; | |
855 | if (q->read_off == q->read_buf->size) { | |
856 | /* all data copied, cleanup */ | |
857 | q->ops->buf_release(q,q->read_buf); | |
858 | kfree(q->read_buf); | |
859 | q->read_buf = NULL; | |
860 | } | |
861 | ||
862 | done: | |
863 | up(&q->lock); | |
864 | return retval; | |
865 | } | |
866 | ||
867 | int videobuf_read_start(struct videobuf_queue *q) | |
868 | { | |
869 | enum v4l2_field field; | |
870 | unsigned long flags; | |
871 | int count = 0, size = 0; | |
872 | int err, i; | |
873 | ||
874 | q->ops->buf_setup(q,&count,&size); | |
875 | if (count < 2) | |
876 | count = 2; | |
877 | if (count > VIDEO_MAX_FRAME) | |
878 | count = VIDEO_MAX_FRAME; | |
879 | size = PAGE_ALIGN(size); | |
880 | ||
881 | err = videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR); | |
882 | if (err) | |
883 | return err; | |
884 | for (i = 0; i < count; i++) { | |
885 | field = videobuf_next_field(q); | |
886 | err = q->ops->buf_prepare(q,q->bufs[i],field); | |
887 | if (err) | |
888 | return err; | |
889 | list_add_tail(&q->bufs[i]->stream, &q->stream); | |
890 | } | |
891 | spin_lock_irqsave(q->irqlock,flags); | |
892 | for (i = 0; i < count; i++) | |
893 | q->ops->buf_queue(q,q->bufs[i]); | |
894 | spin_unlock_irqrestore(q->irqlock,flags); | |
895 | q->reading = 1; | |
896 | return 0; | |
897 | } | |
898 | ||
899 | void videobuf_read_stop(struct videobuf_queue *q) | |
900 | { | |
901 | int i; | |
902 | ||
903 | videobuf_queue_cancel(q); | |
904 | videobuf_mmap_free(q); | |
905 | INIT_LIST_HEAD(&q->stream); | |
906 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
907 | if (NULL == q->bufs[i]) | |
908 | continue; | |
909 | kfree(q->bufs[i]); | |
910 | q->bufs[i] = NULL; | |
911 | } | |
912 | q->read_buf = NULL; | |
913 | q->reading = 0; | |
914 | } | |
915 | ||
916 | ssize_t videobuf_read_stream(struct videobuf_queue *q, | |
917 | char __user *data, size_t count, loff_t *ppos, | |
918 | int vbihack, int nonblocking) | |
919 | { | |
920 | unsigned int *fc, bytes; | |
921 | int err, retval; | |
922 | unsigned long flags; | |
923 | ||
924 | dprintk(2,"%s\n",__FUNCTION__); | |
925 | down(&q->lock); | |
926 | retval = -EBUSY; | |
927 | if (q->streaming) | |
928 | goto done; | |
929 | if (!q->reading) { | |
930 | retval = videobuf_read_start(q); | |
931 | if (retval < 0) | |
932 | goto done; | |
933 | } | |
934 | ||
935 | retval = 0; | |
936 | while (count > 0) { | |
937 | /* get / wait for data */ | |
938 | if (NULL == q->read_buf) { | |
939 | q->read_buf = list_entry(q->stream.next, | |
940 | struct videobuf_buffer, | |
941 | stream); | |
942 | list_del(&q->read_buf->stream); | |
943 | q->read_off = 0; | |
944 | } | |
945 | err = videobuf_waiton(q->read_buf, nonblocking, 1); | |
946 | if (err < 0) { | |
947 | if (0 == retval) | |
948 | retval = err; | |
949 | break; | |
950 | } | |
951 | ||
952 | if (q->read_buf->state == STATE_DONE) { | |
953 | if (vbihack) { | |
954 | /* dirty, undocumented hack -- pass the frame counter | |
955 | * within the last four bytes of each vbi data block. | |
956 | * We need that one to maintain backward compatibility | |
957 | * to all vbi decoding software out there ... */ | |
958 | fc = (unsigned int*)q->read_buf->dma.vmalloc; | |
959 | fc += (q->read_buf->size>>2) -1; | |
960 | *fc = q->read_buf->field_count >> 1; | |
961 | dprintk(1,"vbihack: %d\n",*fc); | |
962 | } | |
963 | ||
964 | /* copy stuff */ | |
965 | bytes = count; | |
966 | if (bytes > q->read_buf->size - q->read_off) | |
967 | bytes = q->read_buf->size - q->read_off; | |
968 | if (copy_to_user(data + retval, | |
969 | q->read_buf->dma.vmalloc + q->read_off, | |
970 | bytes)) { | |
971 | if (0 == retval) | |
972 | retval = -EFAULT; | |
973 | break; | |
974 | } | |
975 | count -= bytes; | |
976 | retval += bytes; | |
977 | q->read_off += bytes; | |
978 | } else { | |
979 | /* some error */ | |
980 | q->read_off = q->read_buf->size; | |
981 | if (0 == retval) | |
982 | retval = -EIO; | |
983 | } | |
984 | ||
985 | /* requeue buffer when done with copying */ | |
986 | if (q->read_off == q->read_buf->size) { | |
987 | list_add_tail(&q->read_buf->stream, | |
988 | &q->stream); | |
989 | spin_lock_irqsave(q->irqlock,flags); | |
990 | q->ops->buf_queue(q,q->read_buf); | |
991 | spin_unlock_irqrestore(q->irqlock,flags); | |
992 | q->read_buf = NULL; | |
993 | } | |
994 | if (retval < 0) | |
995 | break; | |
996 | } | |
997 | ||
998 | done: | |
999 | up(&q->lock); | |
1000 | return retval; | |
1001 | } | |
1002 | ||
1003 | unsigned int videobuf_poll_stream(struct file *file, | |
1004 | struct videobuf_queue *q, | |
1005 | poll_table *wait) | |
1006 | { | |
1007 | struct videobuf_buffer *buf = NULL; | |
1008 | unsigned int rc = 0; | |
1009 | ||
1010 | down(&q->lock); | |
1011 | if (q->streaming) { | |
1012 | if (!list_empty(&q->stream)) | |
1013 | buf = list_entry(q->stream.next, | |
1014 | struct videobuf_buffer, stream); | |
1015 | } else { | |
1016 | if (!q->reading) | |
1017 | videobuf_read_start(q); | |
1018 | if (!q->reading) { | |
1019 | rc = POLLERR; | |
1020 | } else if (NULL == q->read_buf) { | |
1021 | q->read_buf = list_entry(q->stream.next, | |
1022 | struct videobuf_buffer, | |
1023 | stream); | |
1024 | list_del(&q->read_buf->stream); | |
1025 | q->read_off = 0; | |
1026 | } | |
1027 | buf = q->read_buf; | |
1028 | } | |
1029 | if (!buf) | |
1030 | rc = POLLERR; | |
1031 | ||
1032 | if (0 == rc) { | |
1033 | poll_wait(file, &buf->done, wait); | |
1034 | if (buf->state == STATE_DONE || | |
1035 | buf->state == STATE_ERROR) | |
1036 | rc = POLLIN|POLLRDNORM; | |
1037 | } | |
1038 | up(&q->lock); | |
1039 | return rc; | |
1040 | } | |
1041 | ||
1042 | /* --------------------------------------------------------------------- */ | |
1043 | ||
1044 | static void | |
1045 | videobuf_vm_open(struct vm_area_struct *vma) | |
1046 | { | |
1047 | struct videobuf_mapping *map = vma->vm_private_data; | |
1048 | ||
1049 | dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map, | |
1050 | map->count,vma->vm_start,vma->vm_end); | |
1051 | map->count++; | |
1052 | } | |
1053 | ||
1054 | static void | |
1055 | videobuf_vm_close(struct vm_area_struct *vma) | |
1056 | { | |
1057 | struct videobuf_mapping *map = vma->vm_private_data; | |
1058 | struct videobuf_queue *q = map->q; | |
1059 | int i; | |
1060 | ||
1061 | dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map, | |
1062 | map->count,vma->vm_start,vma->vm_end); | |
1063 | ||
1064 | map->count--; | |
1065 | if (0 == map->count) { | |
1066 | dprintk(1,"munmap %p q=%p\n",map,q); | |
1067 | down(&q->lock); | |
1068 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
1069 | if (NULL == q->bufs[i]) | |
1070 | continue; | |
1071 | if (q->bufs[i]) | |
1072 | ; | |
1073 | if (q->bufs[i]->map != map) | |
1074 | continue; | |
1075 | q->bufs[i]->map = NULL; | |
1076 | q->bufs[i]->baddr = 0; | |
1077 | q->ops->buf_release(q,q->bufs[i]); | |
1078 | } | |
1079 | up(&q->lock); | |
1080 | kfree(map); | |
1081 | } | |
1082 | return; | |
1083 | } | |
1084 | ||
1085 | /* | |
1086 | * Get a anonymous page for the mapping. Make sure we can DMA to that | |
1087 | * memory location with 32bit PCI devices (i.e. don't use highmem for | |
1088 | * now ...). Bounce buffers don't work very well for the data rates | |
1089 | * video capture has. | |
1090 | */ | |
1091 | static struct page* | |
1092 | videobuf_vm_nopage(struct vm_area_struct *vma, unsigned long vaddr, | |
1093 | int *type) | |
1094 | { | |
1095 | struct page *page; | |
1096 | ||
1097 | dprintk(3,"nopage: fault @ %08lx [vma %08lx-%08lx]\n", | |
1098 | vaddr,vma->vm_start,vma->vm_end); | |
1099 | if (vaddr > vma->vm_end) | |
1100 | return NOPAGE_SIGBUS; | |
1101 | page = alloc_page(GFP_USER); | |
1102 | if (!page) | |
1103 | return NOPAGE_OOM; | |
1104 | clear_user_page(page_address(page), vaddr, page); | |
1105 | if (type) | |
1106 | *type = VM_FAULT_MINOR; | |
1107 | return page; | |
1108 | } | |
1109 | ||
1110 | static struct vm_operations_struct videobuf_vm_ops = | |
1111 | { | |
1112 | .open = videobuf_vm_open, | |
1113 | .close = videobuf_vm_close, | |
1114 | .nopage = videobuf_vm_nopage, | |
1115 | }; | |
1116 | ||
1117 | int videobuf_mmap_setup(struct videobuf_queue *q, | |
1118 | unsigned int bcount, unsigned int bsize, | |
1119 | enum v4l2_memory memory) | |
1120 | { | |
1121 | unsigned int i; | |
1122 | int err; | |
1123 | ||
1124 | err = videobuf_mmap_free(q); | |
1125 | if (0 != err) | |
1126 | return err; | |
1127 | ||
1128 | for (i = 0; i < bcount; i++) { | |
1129 | q->bufs[i] = videobuf_alloc(q->msize); | |
1130 | q->bufs[i]->i = i; | |
1131 | q->bufs[i]->input = UNSET; | |
1132 | q->bufs[i]->memory = memory; | |
1133 | q->bufs[i]->bsize = bsize; | |
1134 | switch (memory) { | |
1135 | case V4L2_MEMORY_MMAP: | |
1136 | q->bufs[i]->boff = bsize * i; | |
1137 | break; | |
1138 | case V4L2_MEMORY_USERPTR: | |
1139 | case V4L2_MEMORY_OVERLAY: | |
1140 | /* nothing */ | |
1141 | break; | |
1142 | } | |
1143 | } | |
1144 | dprintk(1,"mmap setup: %d buffers, %d bytes each\n", | |
1145 | bcount,bsize); | |
1146 | return 0; | |
1147 | } | |
1148 | ||
1149 | int videobuf_mmap_free(struct videobuf_queue *q) | |
1150 | { | |
1151 | int i; | |
1152 | ||
1153 | for (i = 0; i < VIDEO_MAX_FRAME; i++) | |
1154 | if (q->bufs[i] && q->bufs[i]->map) | |
1155 | return -EBUSY; | |
1156 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
1157 | if (NULL == q->bufs[i]) | |
1158 | continue; | |
1159 | q->ops->buf_release(q,q->bufs[i]); | |
1160 | kfree(q->bufs[i]); | |
1161 | q->bufs[i] = NULL; | |
1162 | } | |
1163 | return 0; | |
1164 | } | |
1165 | ||
1166 | int videobuf_mmap_mapper(struct videobuf_queue *q, | |
1167 | struct vm_area_struct *vma) | |
1168 | { | |
1169 | struct videobuf_mapping *map; | |
1170 | unsigned int first,last,size,i; | |
1171 | int retval; | |
1172 | ||
1173 | down(&q->lock); | |
1174 | retval = -EINVAL; | |
1175 | if (!(vma->vm_flags & VM_WRITE)) { | |
1176 | dprintk(1,"mmap app bug: PROT_WRITE please\n"); | |
1177 | goto done; | |
1178 | } | |
1179 | if (!(vma->vm_flags & VM_SHARED)) { | |
1180 | dprintk(1,"mmap app bug: MAP_SHARED please\n"); | |
1181 | goto done; | |
1182 | } | |
1183 | ||
1184 | /* look for first buffer to map */ | |
1185 | for (first = 0; first < VIDEO_MAX_FRAME; first++) { | |
1186 | if (NULL == q->bufs[first]) | |
1187 | continue; | |
1188 | if (V4L2_MEMORY_MMAP != q->bufs[first]->memory) | |
1189 | continue; | |
1190 | if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT)) | |
1191 | break; | |
1192 | } | |
1193 | if (VIDEO_MAX_FRAME == first) { | |
1194 | dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n", | |
1195 | (vma->vm_pgoff << PAGE_SHIFT)); | |
1196 | goto done; | |
1197 | } | |
1198 | ||
1199 | /* look for last buffer to map */ | |
1200 | for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) { | |
1201 | if (NULL == q->bufs[last]) | |
1202 | continue; | |
1203 | if (V4L2_MEMORY_MMAP != q->bufs[last]->memory) | |
1204 | continue; | |
1205 | if (q->bufs[last]->map) { | |
1206 | retval = -EBUSY; | |
1207 | goto done; | |
1208 | } | |
1209 | size += q->bufs[last]->bsize; | |
1210 | if (size == (vma->vm_end - vma->vm_start)) | |
1211 | break; | |
1212 | } | |
1213 | if (VIDEO_MAX_FRAME == last) { | |
1214 | dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n", | |
1215 | (vma->vm_end - vma->vm_start)); | |
1216 | goto done; | |
1217 | } | |
1218 | ||
1219 | /* create mapping + update buffer list */ | |
1220 | retval = -ENOMEM; | |
1221 | map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL); | |
1222 | if (NULL == map) | |
1223 | goto done; | |
1224 | for (size = 0, i = first; i <= last; size += q->bufs[i++]->bsize) { | |
1225 | q->bufs[i]->map = map; | |
1226 | q->bufs[i]->baddr = vma->vm_start + size; | |
1227 | } | |
1228 | map->count = 1; | |
1229 | map->start = vma->vm_start; | |
1230 | map->end = vma->vm_end; | |
1231 | map->q = q; | |
1232 | vma->vm_ops = &videobuf_vm_ops; | |
1233 | vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED; | |
1234 | vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */ | |
1235 | vma->vm_private_data = map; | |
1236 | dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n", | |
1237 | map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last); | |
1238 | retval = 0; | |
1239 | ||
1240 | done: | |
1241 | up(&q->lock); | |
1242 | return retval; | |
1243 | } | |
1244 | ||
1245 | /* --------------------------------------------------------------------- */ | |
1246 | ||
1247 | EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg); | |
1248 | ||
1249 | EXPORT_SYMBOL_GPL(videobuf_dma_init); | |
1250 | EXPORT_SYMBOL_GPL(videobuf_dma_init_user); | |
1251 | EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel); | |
1252 | EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay); | |
1253 | EXPORT_SYMBOL_GPL(videobuf_dma_pci_map); | |
1254 | EXPORT_SYMBOL_GPL(videobuf_dma_pci_sync); | |
1255 | EXPORT_SYMBOL_GPL(videobuf_dma_pci_unmap); | |
1256 | EXPORT_SYMBOL_GPL(videobuf_dma_free); | |
1257 | ||
1258 | EXPORT_SYMBOL_GPL(videobuf_alloc); | |
1259 | EXPORT_SYMBOL_GPL(videobuf_waiton); | |
1260 | EXPORT_SYMBOL_GPL(videobuf_iolock); | |
1261 | ||
1262 | EXPORT_SYMBOL_GPL(videobuf_queue_init); | |
1263 | EXPORT_SYMBOL_GPL(videobuf_queue_cancel); | |
1264 | EXPORT_SYMBOL_GPL(videobuf_queue_is_busy); | |
1265 | ||
1266 | EXPORT_SYMBOL_GPL(videobuf_next_field); | |
1267 | EXPORT_SYMBOL_GPL(videobuf_status); | |
1268 | EXPORT_SYMBOL_GPL(videobuf_reqbufs); | |
1269 | EXPORT_SYMBOL_GPL(videobuf_querybuf); | |
1270 | EXPORT_SYMBOL_GPL(videobuf_qbuf); | |
1271 | EXPORT_SYMBOL_GPL(videobuf_dqbuf); | |
1272 | EXPORT_SYMBOL_GPL(videobuf_streamon); | |
1273 | EXPORT_SYMBOL_GPL(videobuf_streamoff); | |
1274 | ||
1275 | EXPORT_SYMBOL_GPL(videobuf_read_start); | |
1276 | EXPORT_SYMBOL_GPL(videobuf_read_stop); | |
1277 | EXPORT_SYMBOL_GPL(videobuf_read_stream); | |
1278 | EXPORT_SYMBOL_GPL(videobuf_read_one); | |
1279 | EXPORT_SYMBOL_GPL(videobuf_poll_stream); | |
1280 | ||
1281 | EXPORT_SYMBOL_GPL(videobuf_mmap_setup); | |
1282 | EXPORT_SYMBOL_GPL(videobuf_mmap_free); | |
1283 | EXPORT_SYMBOL_GPL(videobuf_mmap_mapper); | |
1284 | ||
1285 | /* | |
1286 | * Local variables: | |
1287 | * c-basic-offset: 8 | |
1288 | * End: | |
1289 | */ |