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 | ||
7408187d | 55 | sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL); |
1da177e4 LT |
56 | if (NULL == sglist) |
57 | return NULL; | |
1da177e4 LT |
58 | for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) { |
59 | pg = vmalloc_to_page(virt); | |
60 | if (NULL == pg) | |
61 | goto err; | |
62 | if (PageHighMem(pg)) | |
63 | BUG(); | |
64 | sglist[i].page = pg; | |
65 | sglist[i].length = PAGE_SIZE; | |
66 | } | |
67 | return sglist; | |
68 | ||
69 | err: | |
70 | kfree(sglist); | |
71 | return NULL; | |
72 | } | |
73 | ||
74 | struct scatterlist* | |
75 | videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset) | |
76 | { | |
77 | struct scatterlist *sglist; | |
78 | int i = 0; | |
79 | ||
80 | if (NULL == pages[0]) | |
81 | return NULL; | |
7408187d | 82 | sglist = kcalloc(nr_pages, sizeof(*sglist), GFP_KERNEL); |
1da177e4 LT |
83 | if (NULL == sglist) |
84 | return NULL; | |
1da177e4 LT |
85 | |
86 | if (NULL == pages[0]) | |
87 | goto nopage; | |
88 | if (PageHighMem(pages[0])) | |
89 | /* DMA to highmem pages might not work */ | |
90 | goto highmem; | |
91 | sglist[0].page = pages[0]; | |
92 | sglist[0].offset = offset; | |
93 | sglist[0].length = PAGE_SIZE - offset; | |
94 | for (i = 1; i < nr_pages; i++) { | |
95 | if (NULL == pages[i]) | |
96 | goto nopage; | |
97 | if (PageHighMem(pages[i])) | |
98 | goto highmem; | |
99 | sglist[i].page = pages[i]; | |
100 | sglist[i].length = PAGE_SIZE; | |
101 | } | |
102 | return sglist; | |
103 | ||
104 | nopage: | |
105 | dprintk(2,"sgl: oops - no page\n"); | |
106 | kfree(sglist); | |
107 | return NULL; | |
108 | ||
109 | highmem: | |
110 | dprintk(2,"sgl: oops - highmem page\n"); | |
111 | kfree(sglist); | |
112 | return NULL; | |
113 | } | |
114 | ||
115 | /* --------------------------------------------------------------------- */ | |
116 | ||
117 | void videobuf_dma_init(struct videobuf_dmabuf *dma) | |
118 | { | |
119 | memset(dma,0,sizeof(*dma)); | |
120 | dma->magic = MAGIC_DMABUF; | |
121 | } | |
122 | ||
123 | int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction, | |
124 | unsigned long data, unsigned long size) | |
125 | { | |
126 | unsigned long first,last; | |
127 | int err, rw = 0; | |
128 | ||
129 | dma->direction = direction; | |
130 | switch (dma->direction) { | |
131 | case PCI_DMA_FROMDEVICE: rw = READ; break; | |
132 | case PCI_DMA_TODEVICE: rw = WRITE; break; | |
133 | default: BUG(); | |
134 | } | |
135 | ||
136 | first = (data & PAGE_MASK) >> PAGE_SHIFT; | |
137 | last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT; | |
138 | dma->offset = data & ~PAGE_MASK; | |
139 | dma->nr_pages = last-first+1; | |
140 | dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*), | |
141 | GFP_KERNEL); | |
142 | if (NULL == dma->pages) | |
143 | return -ENOMEM; | |
144 | dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n", | |
145 | data,size,dma->nr_pages); | |
146 | ||
147 | down_read(¤t->mm->mmap_sem); | |
4ac97914 | 148 | err = get_user_pages(current,current->mm, |
1da177e4 LT |
149 | data & PAGE_MASK, dma->nr_pages, |
150 | rw == READ, 1, /* force */ | |
151 | dma->pages, NULL); | |
152 | up_read(¤t->mm->mmap_sem); | |
153 | if (err != dma->nr_pages) { | |
154 | dma->nr_pages = (err >= 0) ? err : 0; | |
155 | dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages); | |
156 | return err < 0 ? err : -EINVAL; | |
157 | } | |
158 | return 0; | |
159 | } | |
160 | ||
161 | int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction, | |
162 | int nr_pages) | |
163 | { | |
164 | dprintk(1,"init kernel [%d pages]\n",nr_pages); | |
165 | dma->direction = direction; | |
166 | dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT); | |
167 | if (NULL == dma->vmalloc) { | |
168 | dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages); | |
169 | return -ENOMEM; | |
170 | } | |
171 | memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT); | |
172 | dma->nr_pages = nr_pages; | |
173 | return 0; | |
174 | } | |
175 | ||
176 | int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction, | |
177 | dma_addr_t addr, int nr_pages) | |
178 | { | |
179 | dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n", | |
180 | nr_pages,(unsigned long)addr); | |
181 | dma->direction = direction; | |
182 | if (0 == addr) | |
183 | return -EINVAL; | |
184 | ||
185 | dma->bus_addr = addr; | |
186 | dma->nr_pages = nr_pages; | |
187 | return 0; | |
188 | } | |
189 | ||
190 | int videobuf_dma_pci_map(struct pci_dev *dev, struct videobuf_dmabuf *dma) | |
191 | { | |
192 | MAGIC_CHECK(dma->magic,MAGIC_DMABUF); | |
193 | BUG_ON(0 == dma->nr_pages); | |
194 | ||
195 | if (dma->pages) { | |
196 | dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages, | |
197 | dma->offset); | |
198 | } | |
199 | if (dma->vmalloc) { | |
200 | dma->sglist = videobuf_vmalloc_to_sg | |
201 | (dma->vmalloc,dma->nr_pages); | |
202 | } | |
203 | if (dma->bus_addr) { | |
204 | dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL); | |
205 | if (NULL != dma->sglist) { | |
206 | dma->sglen = 1; | |
207 | sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK; | |
208 | dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK; | |
209 | sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE; | |
210 | } | |
211 | } | |
212 | if (NULL == dma->sglist) { | |
213 | dprintk(1,"scatterlist is NULL\n"); | |
214 | return -ENOMEM; | |
215 | } | |
216 | ||
217 | if (!dma->bus_addr) { | |
218 | dma->sglen = pci_map_sg(dev,dma->sglist,dma->nr_pages, | |
219 | dma->direction); | |
220 | if (0 == dma->sglen) { | |
221 | printk(KERN_WARNING | |
222 | "%s: pci_map_sg failed\n",__FUNCTION__); | |
223 | kfree(dma->sglist); | |
224 | dma->sglist = NULL; | |
225 | dma->sglen = 0; | |
226 | return -EIO; | |
227 | } | |
228 | } | |
229 | return 0; | |
230 | } | |
231 | ||
232 | int videobuf_dma_pci_sync(struct pci_dev *dev, struct videobuf_dmabuf *dma) | |
233 | { | |
234 | MAGIC_CHECK(dma->magic,MAGIC_DMABUF); | |
235 | BUG_ON(!dma->sglen); | |
236 | ||
237 | if (!dma->bus_addr) | |
238 | pci_dma_sync_sg_for_cpu(dev,dma->sglist,dma->nr_pages,dma->direction); | |
239 | return 0; | |
240 | } | |
241 | ||
242 | int videobuf_dma_pci_unmap(struct pci_dev *dev, struct videobuf_dmabuf *dma) | |
243 | { | |
244 | MAGIC_CHECK(dma->magic,MAGIC_DMABUF); | |
245 | if (!dma->sglen) | |
246 | return 0; | |
247 | ||
248 | if (!dma->bus_addr) | |
249 | pci_unmap_sg(dev,dma->sglist,dma->nr_pages,dma->direction); | |
250 | kfree(dma->sglist); | |
251 | dma->sglist = NULL; | |
252 | dma->sglen = 0; | |
253 | return 0; | |
254 | } | |
255 | ||
256 | int videobuf_dma_free(struct videobuf_dmabuf *dma) | |
257 | { | |
258 | MAGIC_CHECK(dma->magic,MAGIC_DMABUF); | |
259 | BUG_ON(dma->sglen); | |
260 | ||
261 | if (dma->pages) { | |
262 | int i; | |
263 | for (i=0; i < dma->nr_pages; i++) | |
264 | page_cache_release(dma->pages[i]); | |
265 | kfree(dma->pages); | |
266 | dma->pages = NULL; | |
267 | } | |
f9101210 JJ |
268 | |
269 | vfree(dma->vmalloc); | |
270 | dma->vmalloc = NULL; | |
271 | ||
1da177e4 LT |
272 | if (dma->bus_addr) { |
273 | dma->bus_addr = 0; | |
274 | } | |
275 | dma->direction = PCI_DMA_NONE; | |
276 | return 0; | |
277 | } | |
278 | ||
279 | /* --------------------------------------------------------------------- */ | |
280 | ||
281 | void* videobuf_alloc(unsigned int size) | |
282 | { | |
283 | struct videobuf_buffer *vb; | |
284 | ||
7408187d | 285 | vb = kzalloc(size,GFP_KERNEL); |
1da177e4 | 286 | if (NULL != vb) { |
1da177e4 LT |
287 | videobuf_dma_init(&vb->dma); |
288 | init_waitqueue_head(&vb->done); | |
289 | vb->magic = MAGIC_BUFFER; | |
290 | } | |
291 | return vb; | |
292 | } | |
293 | ||
294 | int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr) | |
295 | { | |
296 | int retval = 0; | |
297 | DECLARE_WAITQUEUE(wait, current); | |
298 | ||
299 | MAGIC_CHECK(vb->magic,MAGIC_BUFFER); | |
300 | add_wait_queue(&vb->done, &wait); | |
301 | while (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) { | |
302 | if (non_blocking) { | |
303 | retval = -EAGAIN; | |
304 | break; | |
305 | } | |
306 | set_current_state(intr ? TASK_INTERRUPTIBLE | |
307 | : TASK_UNINTERRUPTIBLE); | |
308 | if (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) | |
309 | schedule(); | |
310 | set_current_state(TASK_RUNNING); | |
311 | if (intr && signal_pending(current)) { | |
312 | dprintk(1,"buffer waiton: -EINTR\n"); | |
313 | retval = -EINTR; | |
314 | break; | |
315 | } | |
316 | } | |
317 | remove_wait_queue(&vb->done, &wait); | |
318 | return retval; | |
319 | } | |
320 | ||
321 | int | |
322 | videobuf_iolock(struct pci_dev *pci, struct videobuf_buffer *vb, | |
323 | struct v4l2_framebuffer *fbuf) | |
324 | { | |
325 | int err,pages; | |
326 | dma_addr_t bus; | |
327 | ||
328 | MAGIC_CHECK(vb->magic,MAGIC_BUFFER); | |
329 | switch (vb->memory) { | |
330 | case V4L2_MEMORY_MMAP: | |
331 | case V4L2_MEMORY_USERPTR: | |
332 | if (0 == vb->baddr) { | |
333 | /* no userspace addr -- kernel bounce buffer */ | |
334 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
335 | err = videobuf_dma_init_kernel(&vb->dma,PCI_DMA_FROMDEVICE, | |
336 | pages); | |
337 | if (0 != err) | |
338 | return err; | |
339 | } else { | |
340 | /* dma directly to userspace */ | |
341 | err = videobuf_dma_init_user(&vb->dma,PCI_DMA_FROMDEVICE, | |
342 | vb->baddr,vb->bsize); | |
343 | if (0 != err) | |
344 | return err; | |
345 | } | |
346 | break; | |
347 | case V4L2_MEMORY_OVERLAY: | |
348 | if (NULL == fbuf) | |
349 | return -EINVAL; | |
350 | /* FIXME: need sanity checks for vb->boff */ | |
351 | bus = (dma_addr_t)fbuf->base + vb->boff; | |
352 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
353 | err = videobuf_dma_init_overlay(&vb->dma,PCI_DMA_FROMDEVICE, | |
354 | bus, pages); | |
355 | if (0 != err) | |
356 | return err; | |
357 | break; | |
358 | default: | |
359 | BUG(); | |
360 | } | |
361 | err = videobuf_dma_pci_map(pci,&vb->dma); | |
362 | if (0 != err) | |
363 | return err; | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
368 | /* --------------------------------------------------------------------- */ | |
369 | ||
370 | void videobuf_queue_init(struct videobuf_queue* q, | |
371 | struct videobuf_queue_ops *ops, | |
372 | struct pci_dev *pci, | |
373 | spinlock_t *irqlock, | |
374 | enum v4l2_buf_type type, | |
375 | enum v4l2_field field, | |
376 | unsigned int msize, | |
377 | void *priv) | |
378 | { | |
379 | memset(q,0,sizeof(*q)); | |
380 | q->irqlock = irqlock; | |
381 | q->pci = pci; | |
382 | q->type = type; | |
383 | q->field = field; | |
384 | q->msize = msize; | |
385 | q->ops = ops; | |
386 | q->priv_data = priv; | |
387 | ||
388 | init_MUTEX(&q->lock); | |
389 | INIT_LIST_HEAD(&q->stream); | |
390 | } | |
391 | ||
392 | int | |
393 | videobuf_queue_is_busy(struct videobuf_queue *q) | |
394 | { | |
395 | int i; | |
396 | ||
397 | if (q->streaming) { | |
398 | dprintk(1,"busy: streaming active\n"); | |
399 | return 1; | |
400 | } | |
401 | if (q->reading) { | |
402 | dprintk(1,"busy: pending read #1\n"); | |
403 | return 1; | |
404 | } | |
405 | if (q->read_buf) { | |
406 | dprintk(1,"busy: pending read #2\n"); | |
407 | return 1; | |
408 | } | |
409 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
410 | if (NULL == q->bufs[i]) | |
411 | continue; | |
412 | if (q->bufs[i]->map) { | |
413 | dprintk(1,"busy: buffer #%d mapped\n",i); | |
414 | return 1; | |
415 | } | |
416 | if (q->bufs[i]->state == STATE_QUEUED) { | |
417 | dprintk(1,"busy: buffer #%d queued\n",i); | |
418 | return 1; | |
419 | } | |
420 | if (q->bufs[i]->state == STATE_ACTIVE) { | |
421 | dprintk(1,"busy: buffer #%d avtive\n",i); | |
422 | return 1; | |
423 | } | |
424 | } | |
425 | return 0; | |
426 | } | |
427 | ||
428 | void | |
429 | videobuf_queue_cancel(struct videobuf_queue *q) | |
430 | { | |
431 | unsigned long flags; | |
432 | int i; | |
433 | ||
434 | /* remove queued buffers from list */ | |
435 | spin_lock_irqsave(q->irqlock,flags); | |
436 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
437 | if (NULL == q->bufs[i]) | |
438 | continue; | |
439 | if (q->bufs[i]->state == STATE_QUEUED) { | |
440 | list_del(&q->bufs[i]->queue); | |
441 | q->bufs[i]->state = STATE_ERROR; | |
442 | } | |
443 | } | |
444 | spin_unlock_irqrestore(q->irqlock,flags); | |
445 | ||
446 | /* free all buffers + clear queue */ | |
447 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
448 | if (NULL == q->bufs[i]) | |
449 | continue; | |
450 | q->ops->buf_release(q,q->bufs[i]); | |
451 | } | |
452 | INIT_LIST_HEAD(&q->stream); | |
453 | } | |
454 | ||
455 | /* --------------------------------------------------------------------- */ | |
456 | ||
457 | enum v4l2_field | |
458 | videobuf_next_field(struct videobuf_queue *q) | |
459 | { | |
460 | enum v4l2_field field = q->field; | |
461 | ||
462 | BUG_ON(V4L2_FIELD_ANY == field); | |
463 | ||
464 | if (V4L2_FIELD_ALTERNATE == field) { | |
465 | if (V4L2_FIELD_TOP == q->last) { | |
466 | field = V4L2_FIELD_BOTTOM; | |
467 | q->last = V4L2_FIELD_BOTTOM; | |
468 | } else { | |
469 | field = V4L2_FIELD_TOP; | |
470 | q->last = V4L2_FIELD_TOP; | |
471 | } | |
472 | } | |
473 | return field; | |
474 | } | |
475 | ||
476 | void | |
477 | videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb, | |
478 | enum v4l2_buf_type type) | |
479 | { | |
480 | MAGIC_CHECK(vb->magic,MAGIC_BUFFER); | |
481 | ||
482 | b->index = vb->i; | |
483 | b->type = type; | |
484 | ||
485 | b->memory = vb->memory; | |
486 | switch (b->memory) { | |
487 | case V4L2_MEMORY_MMAP: | |
488 | b->m.offset = vb->boff; | |
489 | b->length = vb->bsize; | |
490 | break; | |
491 | case V4L2_MEMORY_USERPTR: | |
492 | b->m.userptr = vb->baddr; | |
493 | b->length = vb->bsize; | |
494 | break; | |
495 | case V4L2_MEMORY_OVERLAY: | |
496 | b->m.offset = vb->boff; | |
497 | break; | |
498 | } | |
499 | ||
500 | b->flags = 0; | |
501 | if (vb->map) | |
502 | b->flags |= V4L2_BUF_FLAG_MAPPED; | |
503 | ||
504 | switch (vb->state) { | |
505 | case STATE_PREPARED: | |
506 | case STATE_QUEUED: | |
507 | case STATE_ACTIVE: | |
508 | b->flags |= V4L2_BUF_FLAG_QUEUED; | |
509 | break; | |
510 | case STATE_DONE: | |
511 | case STATE_ERROR: | |
512 | b->flags |= V4L2_BUF_FLAG_DONE; | |
513 | break; | |
514 | case STATE_NEEDS_INIT: | |
515 | case STATE_IDLE: | |
516 | /* nothing */ | |
517 | break; | |
518 | } | |
519 | ||
520 | if (vb->input != UNSET) { | |
521 | b->flags |= V4L2_BUF_FLAG_INPUT; | |
522 | b->input = vb->input; | |
523 | } | |
524 | ||
525 | b->field = vb->field; | |
526 | b->timestamp = vb->ts; | |
527 | b->bytesused = vb->size; | |
528 | b->sequence = vb->field_count >> 1; | |
529 | } | |
530 | ||
531 | int | |
532 | videobuf_reqbufs(struct videobuf_queue *q, | |
533 | struct v4l2_requestbuffers *req) | |
534 | { | |
535 | unsigned int size,count; | |
536 | int retval; | |
537 | ||
538 | if (req->type != q->type) | |
539 | return -EINVAL; | |
540 | if (req->count < 1) | |
541 | return -EINVAL; | |
542 | if (req->memory != V4L2_MEMORY_MMAP && | |
543 | req->memory != V4L2_MEMORY_USERPTR && | |
544 | req->memory != V4L2_MEMORY_OVERLAY) | |
545 | return -EINVAL; | |
546 | ||
547 | if (q->streaming) | |
548 | return -EBUSY; | |
549 | if (!list_empty(&q->stream)) | |
550 | return -EBUSY; | |
551 | ||
552 | down(&q->lock); | |
553 | count = req->count; | |
554 | if (count > VIDEO_MAX_FRAME) | |
555 | count = VIDEO_MAX_FRAME; | |
556 | size = 0; | |
557 | q->ops->buf_setup(q,&count,&size); | |
558 | size = PAGE_ALIGN(size); | |
559 | dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n", | |
560 | count, size, (count*size)>>PAGE_SHIFT); | |
561 | ||
562 | retval = videobuf_mmap_setup(q,count,size,req->memory); | |
563 | if (retval < 0) | |
564 | goto done; | |
565 | ||
566 | req->count = count; | |
567 | ||
568 | done: | |
569 | up(&q->lock); | |
570 | return retval; | |
571 | } | |
572 | ||
573 | int | |
574 | videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b) | |
575 | { | |
576 | if (unlikely(b->type != q->type)) | |
577 | return -EINVAL; | |
578 | if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) | |
579 | return -EINVAL; | |
580 | if (unlikely(NULL == q->bufs[b->index])) | |
581 | return -EINVAL; | |
582 | videobuf_status(b,q->bufs[b->index],q->type); | |
583 | return 0; | |
584 | } | |
585 | ||
586 | int | |
587 | videobuf_qbuf(struct videobuf_queue *q, | |
588 | struct v4l2_buffer *b) | |
589 | { | |
590 | struct videobuf_buffer *buf; | |
591 | enum v4l2_field field; | |
592 | unsigned long flags; | |
593 | int retval; | |
594 | ||
595 | down(&q->lock); | |
596 | retval = -EBUSY; | |
597 | if (q->reading) | |
598 | goto done; | |
599 | retval = -EINVAL; | |
600 | if (b->type != q->type) | |
601 | goto done; | |
602 | if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) | |
603 | goto done; | |
604 | buf = q->bufs[b->index]; | |
605 | if (NULL == buf) | |
606 | goto done; | |
607 | MAGIC_CHECK(buf->magic,MAGIC_BUFFER); | |
608 | if (buf->memory != b->memory) | |
609 | goto done; | |
610 | if (buf->state == STATE_QUEUED || | |
611 | buf->state == STATE_ACTIVE) | |
612 | goto done; | |
613 | ||
614 | if (b->flags & V4L2_BUF_FLAG_INPUT) { | |
615 | if (b->input >= q->inputs) | |
616 | goto done; | |
617 | buf->input = b->input; | |
618 | } else { | |
619 | buf->input = UNSET; | |
620 | } | |
621 | ||
622 | switch (b->memory) { | |
623 | case V4L2_MEMORY_MMAP: | |
624 | if (0 == buf->baddr) | |
625 | goto done; | |
626 | break; | |
627 | case V4L2_MEMORY_USERPTR: | |
628 | if (b->length < buf->bsize) | |
629 | goto done; | |
630 | if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr) | |
631 | q->ops->buf_release(q,buf); | |
632 | buf->baddr = b->m.userptr; | |
633 | break; | |
634 | case V4L2_MEMORY_OVERLAY: | |
635 | buf->boff = b->m.offset; | |
636 | break; | |
637 | default: | |
638 | goto done; | |
639 | } | |
640 | ||
641 | field = videobuf_next_field(q); | |
642 | retval = q->ops->buf_prepare(q,buf,field); | |
643 | if (0 != retval) | |
644 | goto done; | |
645 | ||
646 | list_add_tail(&buf->stream,&q->stream); | |
647 | if (q->streaming) { | |
648 | spin_lock_irqsave(q->irqlock,flags); | |
649 | q->ops->buf_queue(q,buf); | |
650 | spin_unlock_irqrestore(q->irqlock,flags); | |
651 | } | |
652 | retval = 0; | |
653 | ||
654 | done: | |
655 | up(&q->lock); | |
656 | return retval; | |
657 | } | |
658 | ||
659 | int | |
660 | videobuf_dqbuf(struct videobuf_queue *q, | |
661 | struct v4l2_buffer *b, int nonblocking) | |
662 | { | |
663 | struct videobuf_buffer *buf; | |
664 | int retval; | |
665 | ||
666 | down(&q->lock); | |
667 | retval = -EBUSY; | |
668 | if (q->reading) | |
669 | goto done; | |
670 | retval = -EINVAL; | |
671 | if (b->type != q->type) | |
672 | goto done; | |
673 | if (list_empty(&q->stream)) | |
674 | goto done; | |
675 | buf = list_entry(q->stream.next, struct videobuf_buffer, stream); | |
676 | retval = videobuf_waiton(buf, nonblocking, 1); | |
677 | if (retval < 0) | |
678 | goto done; | |
679 | switch (buf->state) { | |
680 | case STATE_ERROR: | |
681 | retval = -EIO; | |
682 | /* fall through */ | |
683 | case STATE_DONE: | |
684 | videobuf_dma_pci_sync(q->pci,&buf->dma); | |
685 | buf->state = STATE_IDLE; | |
686 | break; | |
687 | default: | |
688 | retval = -EINVAL; | |
689 | goto done; | |
690 | } | |
691 | list_del(&buf->stream); | |
692 | memset(b,0,sizeof(*b)); | |
693 | videobuf_status(b,buf,q->type); | |
694 | ||
695 | done: | |
696 | up(&q->lock); | |
697 | return retval; | |
698 | } | |
699 | ||
700 | int videobuf_streamon(struct videobuf_queue *q) | |
701 | { | |
702 | struct videobuf_buffer *buf; | |
703 | struct list_head *list; | |
704 | unsigned long flags; | |
705 | int retval; | |
706 | ||
707 | down(&q->lock); | |
708 | retval = -EBUSY; | |
709 | if (q->reading) | |
710 | goto done; | |
711 | retval = 0; | |
712 | if (q->streaming) | |
713 | goto done; | |
714 | q->streaming = 1; | |
715 | spin_lock_irqsave(q->irqlock,flags); | |
716 | list_for_each(list,&q->stream) { | |
717 | buf = list_entry(list, struct videobuf_buffer, stream); | |
718 | if (buf->state == STATE_PREPARED) | |
719 | q->ops->buf_queue(q,buf); | |
720 | } | |
721 | spin_unlock_irqrestore(q->irqlock,flags); | |
722 | ||
723 | done: | |
724 | up(&q->lock); | |
725 | return retval; | |
726 | } | |
727 | ||
728 | int videobuf_streamoff(struct videobuf_queue *q) | |
729 | { | |
730 | int retval = -EINVAL; | |
731 | ||
732 | down(&q->lock); | |
733 | if (!q->streaming) | |
734 | goto done; | |
735 | videobuf_queue_cancel(q); | |
736 | q->streaming = 0; | |
737 | retval = 0; | |
738 | ||
739 | done: | |
740 | up(&q->lock); | |
741 | return retval; | |
742 | } | |
743 | ||
744 | static ssize_t | |
745 | videobuf_read_zerocopy(struct videobuf_queue *q, char __user *data, | |
746 | size_t count, loff_t *ppos) | |
747 | { | |
748 | enum v4l2_field field; | |
749 | unsigned long flags; | |
4ac97914 | 750 | int retval; |
1da177e4 | 751 | |
4ac97914 | 752 | /* setup stuff */ |
1da177e4 LT |
753 | q->read_buf = videobuf_alloc(q->msize); |
754 | if (NULL == q->read_buf) | |
50ab5edc | 755 | return -ENOMEM; |
1da177e4 LT |
756 | |
757 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
758 | q->read_buf->baddr = (unsigned long)data; | |
4ac97914 | 759 | q->read_buf->bsize = count; |
1da177e4 LT |
760 | field = videobuf_next_field(q); |
761 | retval = q->ops->buf_prepare(q,q->read_buf,field); | |
762 | if (0 != retval) | |
763 | goto done; | |
764 | ||
4ac97914 | 765 | /* start capture & wait */ |
1da177e4 LT |
766 | spin_lock_irqsave(q->irqlock,flags); |
767 | q->ops->buf_queue(q,q->read_buf); | |
768 | spin_unlock_irqrestore(q->irqlock,flags); | |
4ac97914 MCC |
769 | retval = videobuf_waiton(q->read_buf,0,0); |
770 | if (0 == retval) { | |
1da177e4 LT |
771 | videobuf_dma_pci_sync(q->pci,&q->read_buf->dma); |
772 | if (STATE_ERROR == q->read_buf->state) | |
773 | retval = -EIO; | |
774 | else | |
775 | retval = q->read_buf->size; | |
776 | } | |
777 | ||
778 | done: | |
779 | /* cleanup */ | |
780 | q->ops->buf_release(q,q->read_buf); | |
781 | kfree(q->read_buf); | |
782 | q->read_buf = NULL; | |
783 | return retval; | |
784 | } | |
785 | ||
786 | ssize_t videobuf_read_one(struct videobuf_queue *q, | |
787 | char __user *data, size_t count, loff_t *ppos, | |
788 | int nonblocking) | |
789 | { | |
790 | enum v4l2_field field; | |
791 | unsigned long flags; | |
792 | unsigned size, nbufs, bytes; | |
793 | int retval; | |
794 | ||
795 | down(&q->lock); | |
796 | ||
797 | nbufs = 1; size = 0; | |
798 | q->ops->buf_setup(q,&nbufs,&size); | |
799 | if (NULL == q->read_buf && | |
800 | count >= size && | |
801 | !nonblocking) { | |
802 | retval = videobuf_read_zerocopy(q,data,count,ppos); | |
803 | if (retval >= 0 || retval == -EIO) | |
804 | /* ok, all done */ | |
805 | goto done; | |
806 | /* fallback to kernel bounce buffer on failures */ | |
807 | } | |
808 | ||
809 | if (NULL == q->read_buf) { | |
810 | /* need to capture a new frame */ | |
811 | retval = -ENOMEM; | |
812 | q->read_buf = videobuf_alloc(q->msize); | |
813 | if (NULL == q->read_buf) | |
814 | goto done; | |
815 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
13c72805 | 816 | q->read_buf->bsize = count; /* preferred size */ |
1da177e4 LT |
817 | field = videobuf_next_field(q); |
818 | retval = q->ops->buf_prepare(q,q->read_buf,field); | |
50ab5edc NS |
819 | if (0 != retval) { |
820 | kfree (q->read_buf); | |
821 | q->read_buf = NULL; | |
1da177e4 | 822 | goto done; |
50ab5edc | 823 | } |
1da177e4 LT |
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 */ | |
4ac97914 | 831 | retval = videobuf_waiton(q->read_buf, nonblocking, 1); |
1da177e4 LT |
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); | |
4ac97914 | 1099 | if (vaddr > vma->vm_end) |
1da177e4 LT |
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 | */ |