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1da177e4 LT |
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 | */ |