Commit | Line | Data |
---|---|---|
7a7d9a89 MCC |
1 | /* |
2 | * generic helper functions for handling video4linux capture buffers | |
3 | * | |
4 | * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org> | |
5 | * | |
6 | * Highly based on video-buf written originally by: | |
7 | * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> | |
8 | * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org> | |
9 | * (c) 2006 Ted Walther and John Sokol | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 | |
14 | */ | |
15 | ||
16 | #include <linux/init.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/moduleparam.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/interrupt.h> | |
21 | ||
22 | #include <media/videobuf-core.h> | |
23 | ||
24 | #define MAGIC_BUFFER 0x20070728 | |
25 | #define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \ | |
26 | { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); } | |
27 | ||
28 | static int debug = 0; | |
29 | module_param(debug, int, 0644); | |
30 | ||
31 | MODULE_DESCRIPTION("helper module to manage video4linux buffers"); | |
32 | MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>"); | |
33 | MODULE_LICENSE("GPL"); | |
34 | ||
35 | #define dprintk(level, fmt, arg...) if (debug >= level) \ | |
36 | printk(KERN_DEBUG "vbuf: " fmt , ## arg) | |
37 | ||
38 | /* --------------------------------------------------------------------- */ | |
39 | ||
40 | #define CALL(q, f, arg...) \ | |
41 | ( (q->int_ops->f)? q->int_ops->f(arg) : 0) | |
42 | ||
43 | void* videobuf_alloc(struct videobuf_queue* q) | |
44 | { | |
45 | struct videobuf_buffer *vb; | |
46 | ||
47 | BUG_ON (q->msize<sizeof(*vb)); | |
48 | ||
49 | if (!q->int_ops || !q->int_ops->alloc) { | |
50 | printk(KERN_ERR "No specific ops defined!\n"); | |
51 | BUG(); | |
52 | } | |
53 | ||
54 | vb = q->int_ops->alloc(q->msize); | |
55 | ||
56 | if (NULL != vb) { | |
57 | init_waitqueue_head(&vb->done); | |
58 | vb->magic = MAGIC_BUFFER; | |
59 | } | |
60 | ||
61 | return vb; | |
62 | } | |
63 | ||
64 | int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr) | |
65 | { | |
66 | int retval = 0; | |
67 | DECLARE_WAITQUEUE(wait, current); | |
68 | ||
69 | MAGIC_CHECK(vb->magic,MAGIC_BUFFER); | |
70 | add_wait_queue(&vb->done, &wait); | |
71 | while (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) { | |
72 | if (non_blocking) { | |
73 | retval = -EAGAIN; | |
74 | break; | |
75 | } | |
76 | set_current_state(intr ? TASK_INTERRUPTIBLE | |
77 | : TASK_UNINTERRUPTIBLE); | |
78 | if (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) | |
79 | schedule(); | |
80 | set_current_state(TASK_RUNNING); | |
81 | if (intr && signal_pending(current)) { | |
82 | dprintk(1,"buffer waiton: -EINTR\n"); | |
83 | retval = -EINTR; | |
84 | break; | |
85 | } | |
86 | } | |
87 | remove_wait_queue(&vb->done, &wait); | |
88 | return retval; | |
89 | } | |
90 | ||
91 | int videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb, | |
92 | struct v4l2_framebuffer *fbuf) | |
93 | { | |
94 | MAGIC_CHECK(vb->magic,MAGIC_BUFFER); | |
95 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); | |
96 | ||
d5f1b016 MCC |
97 | /* FIXME: This is required to avoid OOPS on some cases, since mmap_mapper() |
98 | method should be called before _iolock. | |
99 | On some cases, the mmap_mapper() is called only after scheduling. | |
100 | ||
101 | However, this way is just too dirty! Better to wait for some event. | |
102 | */ | |
103 | schedule_timeout(HZ); | |
104 | ||
7a7d9a89 MCC |
105 | return CALL(q,iolock,q,vb,fbuf); |
106 | } | |
107 | ||
108 | /* --------------------------------------------------------------------- */ | |
109 | ||
110 | ||
d4cae5a5 | 111 | void videobuf_queue_core_init(struct videobuf_queue* q, |
7a7d9a89 MCC |
112 | struct videobuf_queue_ops *ops, |
113 | void *dev, | |
114 | spinlock_t *irqlock, | |
115 | enum v4l2_buf_type type, | |
116 | enum v4l2_field field, | |
117 | unsigned int msize, | |
d4cae5a5 MCC |
118 | void *priv, |
119 | struct videobuf_qtype_ops *int_ops) | |
7a7d9a89 MCC |
120 | { |
121 | memset(q,0,sizeof(*q)); | |
d4cae5a5 MCC |
122 | q->irqlock = irqlock; |
123 | q->dev = dev; | |
124 | q->type = type; | |
125 | q->field = field; | |
126 | q->msize = msize; | |
127 | q->ops = ops; | |
7a7d9a89 | 128 | q->priv_data = priv; |
d4cae5a5 | 129 | q->int_ops = int_ops; |
7a7d9a89 MCC |
130 | |
131 | /* All buffer operations are mandatory */ | |
132 | BUG_ON (!q->ops->buf_setup); | |
133 | BUG_ON (!q->ops->buf_prepare); | |
134 | BUG_ON (!q->ops->buf_queue); | |
135 | BUG_ON (!q->ops->buf_release); | |
136 | ||
d4cae5a5 MCC |
137 | /* Having implementations for abstract methods are mandatory */ |
138 | BUG_ON (!q->int_ops); | |
139 | ||
7a7d9a89 MCC |
140 | mutex_init(&q->lock); |
141 | INIT_LIST_HEAD(&q->stream); | |
142 | } | |
143 | ||
19bc5133 | 144 | /* Locking: Only usage in bttv unsafe find way to remove */ |
7a7d9a89 MCC |
145 | int videobuf_queue_is_busy(struct videobuf_queue *q) |
146 | { | |
147 | int i; | |
148 | ||
149 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); | |
150 | ||
151 | if (q->streaming) { | |
152 | dprintk(1,"busy: streaming active\n"); | |
153 | return 1; | |
154 | } | |
155 | if (q->reading) { | |
156 | dprintk(1,"busy: pending read #1\n"); | |
157 | return 1; | |
158 | } | |
159 | if (q->read_buf) { | |
160 | dprintk(1,"busy: pending read #2\n"); | |
161 | return 1; | |
162 | } | |
163 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
164 | if (NULL == q->bufs[i]) | |
165 | continue; | |
851c0c96 | 166 | if (q->bufs[i]->map) { |
7a7d9a89 MCC |
167 | dprintk(1,"busy: buffer #%d mapped\n",i); |
168 | return 1; | |
169 | } | |
170 | if (q->bufs[i]->state == STATE_QUEUED) { | |
171 | dprintk(1,"busy: buffer #%d queued\n",i); | |
172 | return 1; | |
173 | } | |
174 | if (q->bufs[i]->state == STATE_ACTIVE) { | |
175 | dprintk(1,"busy: buffer #%d avtive\n",i); | |
176 | return 1; | |
177 | } | |
178 | } | |
179 | return 0; | |
180 | } | |
181 | ||
19bc5133 | 182 | /* Locking: Caller holds q->lock */ |
7a7d9a89 MCC |
183 | void videobuf_queue_cancel(struct videobuf_queue *q) |
184 | { | |
185 | unsigned long flags=0; | |
186 | int i; | |
187 | ||
188 | /* remove queued buffers from list */ | |
189 | if (q->irqlock) | |
190 | spin_lock_irqsave(q->irqlock,flags); | |
191 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
192 | if (NULL == q->bufs[i]) | |
193 | continue; | |
194 | if (q->bufs[i]->state == STATE_QUEUED) { | |
195 | list_del(&q->bufs[i]->queue); | |
196 | q->bufs[i]->state = STATE_ERROR; | |
197 | } | |
198 | } | |
199 | if (q->irqlock) | |
200 | spin_unlock_irqrestore(q->irqlock,flags); | |
201 | ||
202 | /* free all buffers + clear queue */ | |
203 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
204 | if (NULL == q->bufs[i]) | |
205 | continue; | |
206 | q->ops->buf_release(q,q->bufs[i]); | |
207 | } | |
208 | INIT_LIST_HEAD(&q->stream); | |
209 | } | |
210 | ||
211 | /* --------------------------------------------------------------------- */ | |
212 | ||
19bc5133 | 213 | /* Locking: Caller holds q->lock */ |
7a7d9a89 MCC |
214 | enum v4l2_field videobuf_next_field(struct videobuf_queue *q) |
215 | { | |
216 | enum v4l2_field field = q->field; | |
217 | ||
218 | BUG_ON(V4L2_FIELD_ANY == field); | |
219 | ||
220 | if (V4L2_FIELD_ALTERNATE == field) { | |
221 | if (V4L2_FIELD_TOP == q->last) { | |
222 | field = V4L2_FIELD_BOTTOM; | |
223 | q->last = V4L2_FIELD_BOTTOM; | |
224 | } else { | |
225 | field = V4L2_FIELD_TOP; | |
226 | q->last = V4L2_FIELD_TOP; | |
227 | } | |
228 | } | |
229 | return field; | |
230 | } | |
231 | ||
19bc5133 | 232 | /* Locking: Caller holds q->lock */ |
7a7d9a89 MCC |
233 | static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b, |
234 | struct videobuf_buffer *vb, enum v4l2_buf_type type) | |
235 | { | |
236 | MAGIC_CHECK(vb->magic,MAGIC_BUFFER); | |
237 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); | |
238 | ||
239 | b->index = vb->i; | |
240 | b->type = type; | |
241 | ||
242 | b->memory = vb->memory; | |
243 | switch (b->memory) { | |
244 | case V4L2_MEMORY_MMAP: | |
245 | b->m.offset = vb->boff; | |
246 | b->length = vb->bsize; | |
247 | break; | |
248 | case V4L2_MEMORY_USERPTR: | |
249 | b->m.userptr = vb->baddr; | |
250 | b->length = vb->bsize; | |
251 | break; | |
252 | case V4L2_MEMORY_OVERLAY: | |
253 | b->m.offset = vb->boff; | |
254 | break; | |
255 | } | |
256 | ||
257 | b->flags = 0; | |
851c0c96 | 258 | if (vb->map) |
7a7d9a89 MCC |
259 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
260 | ||
261 | switch (vb->state) { | |
262 | case STATE_PREPARED: | |
263 | case STATE_QUEUED: | |
264 | case STATE_ACTIVE: | |
265 | b->flags |= V4L2_BUF_FLAG_QUEUED; | |
266 | break; | |
267 | case STATE_DONE: | |
268 | case STATE_ERROR: | |
269 | b->flags |= V4L2_BUF_FLAG_DONE; | |
270 | break; | |
271 | case STATE_NEEDS_INIT: | |
272 | case STATE_IDLE: | |
273 | /* nothing */ | |
274 | break; | |
275 | } | |
276 | ||
277 | if (vb->input != UNSET) { | |
278 | b->flags |= V4L2_BUF_FLAG_INPUT; | |
279 | b->input = vb->input; | |
280 | } | |
281 | ||
282 | b->field = vb->field; | |
283 | b->timestamp = vb->ts; | |
284 | b->bytesused = vb->size; | |
285 | b->sequence = vb->field_count >> 1; | |
286 | } | |
287 | ||
19bc5133 BP |
288 | /* Locking: Caller holds q->lock */ |
289 | static int __videobuf_mmap_free(struct videobuf_queue *q) | |
290 | { | |
291 | int i; | |
292 | int rc; | |
293 | ||
294 | if (!q) | |
295 | return 0; | |
296 | ||
297 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); | |
298 | ||
299 | rc = CALL(q,mmap_free,q); | |
300 | if (rc<0) | |
301 | return rc; | |
302 | ||
303 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
304 | if (NULL == q->bufs[i]) | |
305 | continue; | |
306 | q->ops->buf_release(q,q->bufs[i]); | |
307 | kfree(q->bufs[i]); | |
308 | q->bufs[i] = NULL; | |
309 | } | |
310 | ||
311 | return rc; | |
312 | } | |
313 | ||
314 | int videobuf_mmap_free(struct videobuf_queue *q) | |
315 | { | |
316 | int ret; | |
317 | mutex_lock(&q->lock); | |
318 | ret = __videobuf_mmap_free(q); | |
319 | mutex_unlock(&q->lock); | |
320 | return ret; | |
321 | } | |
322 | ||
323 | /* Locking: Caller holds q->lock */ | |
324 | static int __videobuf_mmap_setup(struct videobuf_queue *q, | |
325 | unsigned int bcount, unsigned int bsize, | |
326 | enum v4l2_memory memory) | |
327 | { | |
328 | unsigned int i; | |
329 | int err; | |
330 | ||
331 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); | |
332 | ||
333 | err = __videobuf_mmap_free(q); | |
334 | if (0 != err) | |
335 | return err; | |
336 | ||
337 | /* Allocate and initialize buffers */ | |
338 | for (i = 0; i < bcount; i++) { | |
339 | q->bufs[i] = videobuf_alloc(q); | |
340 | ||
341 | if (q->bufs[i] == NULL) | |
342 | break; | |
343 | ||
344 | q->bufs[i]->i = i; | |
345 | q->bufs[i]->input = UNSET; | |
346 | q->bufs[i]->memory = memory; | |
347 | q->bufs[i]->bsize = bsize; | |
348 | switch (memory) { | |
349 | case V4L2_MEMORY_MMAP: | |
350 | q->bufs[i]->boff = bsize * i; | |
351 | break; | |
352 | case V4L2_MEMORY_USERPTR: | |
353 | case V4L2_MEMORY_OVERLAY: | |
354 | /* nothing */ | |
355 | break; | |
356 | } | |
357 | } | |
358 | ||
359 | if (!i) | |
360 | return -ENOMEM; | |
361 | ||
362 | dprintk(1,"mmap setup: %d buffers, %d bytes each\n", | |
363 | i, bsize); | |
364 | ||
365 | return i; | |
366 | } | |
367 | ||
368 | int videobuf_mmap_setup(struct videobuf_queue *q, | |
369 | unsigned int bcount, unsigned int bsize, | |
370 | enum v4l2_memory memory) | |
371 | { | |
372 | int ret; | |
373 | mutex_lock(&q->lock); | |
374 | ret = __videobuf_mmap_setup(q, bcount, bsize, memory); | |
375 | mutex_unlock(&q->lock); | |
376 | return ret; | |
377 | } | |
378 | ||
7a7d9a89 MCC |
379 | int videobuf_reqbufs(struct videobuf_queue *q, |
380 | struct v4l2_requestbuffers *req) | |
381 | { | |
382 | unsigned int size,count; | |
383 | int retval; | |
384 | ||
7a7d9a89 MCC |
385 | if (req->count < 1) { |
386 | dprintk(1,"reqbufs: count invalid (%d)\n",req->count); | |
387 | return -EINVAL; | |
388 | } | |
19bc5133 | 389 | |
7a7d9a89 MCC |
390 | if (req->memory != V4L2_MEMORY_MMAP && |
391 | req->memory != V4L2_MEMORY_USERPTR && | |
392 | req->memory != V4L2_MEMORY_OVERLAY) { | |
393 | dprintk(1,"reqbufs: memory type invalid\n"); | |
394 | return -EINVAL; | |
395 | } | |
396 | ||
00f98d08 | 397 | mutex_lock(&q->lock); |
19bc5133 BP |
398 | if (req->type != q->type) { |
399 | dprintk(1,"reqbufs: queue type invalid\n"); | |
400 | retval = -EINVAL; | |
401 | goto done; | |
402 | } | |
403 | ||
7a7d9a89 MCC |
404 | if (q->streaming) { |
405 | dprintk(1,"reqbufs: streaming already exists\n"); | |
00f98d08 BP |
406 | retval = -EBUSY; |
407 | goto done; | |
7a7d9a89 MCC |
408 | } |
409 | if (!list_empty(&q->stream)) { | |
410 | dprintk(1,"reqbufs: stream running\n"); | |
00f98d08 BP |
411 | retval = -EBUSY; |
412 | goto done; | |
7a7d9a89 MCC |
413 | } |
414 | ||
7a7d9a89 MCC |
415 | count = req->count; |
416 | if (count > VIDEO_MAX_FRAME) | |
417 | count = VIDEO_MAX_FRAME; | |
418 | size = 0; | |
419 | q->ops->buf_setup(q,&count,&size); | |
420 | size = PAGE_ALIGN(size); | |
421 | dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n", | |
422 | count, size, (count*size)>>PAGE_SHIFT); | |
423 | ||
19bc5133 | 424 | retval = __videobuf_mmap_setup(q,count,size,req->memory); |
7a7d9a89 MCC |
425 | if (retval < 0) { |
426 | dprintk(1,"reqbufs: mmap setup returned %d\n",retval); | |
427 | goto done; | |
428 | } | |
429 | ||
49ee718e | 430 | req->count = retval; |
7a7d9a89 MCC |
431 | |
432 | done: | |
433 | mutex_unlock(&q->lock); | |
434 | return retval; | |
435 | } | |
436 | ||
437 | int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b) | |
438 | { | |
19bc5133 BP |
439 | int ret = -EINVAL; |
440 | ||
441 | mutex_lock(&q->lock); | |
7a7d9a89 MCC |
442 | if (unlikely(b->type != q->type)) { |
443 | dprintk(1,"querybuf: Wrong type.\n"); | |
19bc5133 | 444 | goto done; |
7a7d9a89 MCC |
445 | } |
446 | if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) { | |
447 | dprintk(1,"querybuf: index out of range.\n"); | |
19bc5133 | 448 | goto done; |
7a7d9a89 MCC |
449 | } |
450 | if (unlikely(NULL == q->bufs[b->index])) { | |
451 | dprintk(1,"querybuf: buffer is null.\n"); | |
19bc5133 | 452 | goto done; |
7a7d9a89 | 453 | } |
19bc5133 | 454 | |
7a7d9a89 | 455 | videobuf_status(q,b,q->bufs[b->index],q->type); |
19bc5133 BP |
456 | |
457 | ret = 0; | |
458 | done: | |
459 | mutex_unlock(&q->lock); | |
460 | return ret; | |
7a7d9a89 MCC |
461 | } |
462 | ||
463 | int videobuf_qbuf(struct videobuf_queue *q, | |
464 | struct v4l2_buffer *b) | |
465 | { | |
466 | struct videobuf_buffer *buf; | |
467 | enum v4l2_field field; | |
468 | unsigned long flags=0; | |
469 | int retval; | |
470 | ||
471 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); | |
472 | ||
9900132f ML |
473 | if (b->memory == V4L2_MEMORY_MMAP) |
474 | down_read(¤t->mm->mmap_sem); | |
475 | ||
7a7d9a89 MCC |
476 | mutex_lock(&q->lock); |
477 | retval = -EBUSY; | |
478 | if (q->reading) { | |
479 | dprintk(1,"qbuf: Reading running...\n"); | |
480 | goto done; | |
481 | } | |
482 | retval = -EINVAL; | |
483 | if (b->type != q->type) { | |
484 | dprintk(1,"qbuf: Wrong type.\n"); | |
485 | goto done; | |
486 | } | |
487 | if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) { | |
488 | dprintk(1,"qbuf: index out of range.\n"); | |
489 | goto done; | |
490 | } | |
491 | buf = q->bufs[b->index]; | |
492 | if (NULL == buf) { | |
493 | dprintk(1,"qbuf: buffer is null.\n"); | |
494 | goto done; | |
495 | } | |
496 | MAGIC_CHECK(buf->magic,MAGIC_BUFFER); | |
497 | if (buf->memory != b->memory) { | |
498 | dprintk(1,"qbuf: memory type is wrong.\n"); | |
499 | goto done; | |
500 | } | |
501 | if (buf->state != STATE_NEEDS_INIT && buf->state != STATE_IDLE) { | |
502 | dprintk(1,"qbuf: buffer is already queued or active.\n"); | |
503 | goto done; | |
504 | } | |
505 | ||
506 | if (b->flags & V4L2_BUF_FLAG_INPUT) { | |
507 | if (b->input >= q->inputs) { | |
508 | dprintk(1,"qbuf: wrong input.\n"); | |
509 | goto done; | |
510 | } | |
511 | buf->input = b->input; | |
512 | } else { | |
513 | buf->input = UNSET; | |
514 | } | |
515 | ||
516 | switch (b->memory) { | |
517 | case V4L2_MEMORY_MMAP: | |
518 | if (0 == buf->baddr) { | |
519 | dprintk(1,"qbuf: mmap requested but buffer addr is zero!\n"); | |
520 | goto done; | |
521 | } | |
522 | break; | |
523 | case V4L2_MEMORY_USERPTR: | |
524 | if (b->length < buf->bsize) { | |
525 | dprintk(1,"qbuf: buffer length is not enough\n"); | |
526 | goto done; | |
527 | } | |
528 | if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr) | |
529 | q->ops->buf_release(q,buf); | |
530 | buf->baddr = b->m.userptr; | |
531 | break; | |
532 | case V4L2_MEMORY_OVERLAY: | |
533 | buf->boff = b->m.offset; | |
534 | break; | |
535 | default: | |
536 | dprintk(1,"qbuf: wrong memory type\n"); | |
537 | goto done; | |
538 | } | |
539 | ||
540 | dprintk(1,"qbuf: requesting next field\n"); | |
541 | field = videobuf_next_field(q); | |
542 | retval = q->ops->buf_prepare(q,buf,field); | |
543 | if (0 != retval) { | |
544 | dprintk(1,"qbuf: buffer_prepare returned %d\n",retval); | |
545 | goto done; | |
546 | } | |
547 | ||
548 | list_add_tail(&buf->stream,&q->stream); | |
549 | if (q->streaming) { | |
550 | if (q->irqlock) | |
551 | spin_lock_irqsave(q->irqlock,flags); | |
552 | q->ops->buf_queue(q,buf); | |
553 | if (q->irqlock) | |
554 | spin_unlock_irqrestore(q->irqlock,flags); | |
555 | } | |
556 | dprintk(1,"qbuf: succeded\n"); | |
557 | retval = 0; | |
558 | ||
559 | done: | |
560 | mutex_unlock(&q->lock); | |
9900132f ML |
561 | |
562 | if (b->memory == V4L2_MEMORY_MMAP) | |
563 | up_read(¤t->mm->mmap_sem); | |
564 | ||
7a7d9a89 MCC |
565 | return retval; |
566 | } | |
567 | ||
568 | int videobuf_dqbuf(struct videobuf_queue *q, | |
569 | struct v4l2_buffer *b, int nonblocking) | |
570 | { | |
571 | struct videobuf_buffer *buf; | |
572 | int retval; | |
573 | ||
574 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); | |
575 | ||
576 | mutex_lock(&q->lock); | |
577 | retval = -EBUSY; | |
578 | if (q->reading) { | |
579 | dprintk(1,"dqbuf: Reading running...\n"); | |
580 | goto done; | |
581 | } | |
582 | retval = -EINVAL; | |
583 | if (b->type != q->type) { | |
584 | dprintk(1,"dqbuf: Wrong type.\n"); | |
585 | goto done; | |
586 | } | |
587 | if (list_empty(&q->stream)) { | |
588 | dprintk(1,"dqbuf: stream running\n"); | |
589 | goto done; | |
590 | } | |
591 | buf = list_entry(q->stream.next, struct videobuf_buffer, stream); | |
592 | retval = videobuf_waiton(buf, nonblocking, 1); | |
593 | if (retval < 0) { | |
594 | dprintk(1,"dqbuf: waiton returned %d\n",retval); | |
595 | goto done; | |
596 | } | |
597 | switch (buf->state) { | |
598 | case STATE_ERROR: | |
599 | dprintk(1,"dqbuf: state is error\n"); | |
600 | retval = -EIO; | |
601 | CALL(q,sync,q, buf); | |
602 | buf->state = STATE_IDLE; | |
603 | break; | |
604 | case STATE_DONE: | |
605 | dprintk(1,"dqbuf: state is done\n"); | |
606 | CALL(q,sync,q, buf); | |
607 | buf->state = STATE_IDLE; | |
608 | break; | |
609 | default: | |
610 | dprintk(1,"dqbuf: state invalid\n"); | |
611 | retval = -EINVAL; | |
612 | goto done; | |
613 | } | |
614 | list_del(&buf->stream); | |
615 | memset(b,0,sizeof(*b)); | |
616 | videobuf_status(q,b,buf,q->type); | |
617 | ||
618 | done: | |
619 | mutex_unlock(&q->lock); | |
620 | return retval; | |
621 | } | |
622 | ||
623 | int videobuf_streamon(struct videobuf_queue *q) | |
624 | { | |
625 | struct videobuf_buffer *buf; | |
7a7d9a89 MCC |
626 | unsigned long flags=0; |
627 | int retval; | |
628 | ||
629 | mutex_lock(&q->lock); | |
630 | retval = -EBUSY; | |
631 | if (q->reading) | |
632 | goto done; | |
633 | retval = 0; | |
634 | if (q->streaming) | |
635 | goto done; | |
636 | q->streaming = 1; | |
637 | if (q->irqlock) | |
638 | spin_lock_irqsave(q->irqlock,flags); | |
a991f44b | 639 | list_for_each_entry(buf, &q->stream, stream) |
7a7d9a89 MCC |
640 | if (buf->state == STATE_PREPARED) |
641 | q->ops->buf_queue(q,buf); | |
7a7d9a89 MCC |
642 | if (q->irqlock) |
643 | spin_unlock_irqrestore(q->irqlock,flags); | |
644 | ||
645 | done: | |
646 | mutex_unlock(&q->lock); | |
647 | return retval; | |
648 | } | |
649 | ||
19bc5133 BP |
650 | /* Locking: Caller holds q->lock */ |
651 | static int __videobuf_streamoff(struct videobuf_queue *q) | |
7a7d9a89 | 652 | { |
7a7d9a89 | 653 | if (!q->streaming) |
19bc5133 BP |
654 | return -EINVAL; |
655 | ||
7a7d9a89 MCC |
656 | videobuf_queue_cancel(q); |
657 | q->streaming = 0; | |
7a7d9a89 | 658 | |
19bc5133 BP |
659 | return 0; |
660 | } | |
661 | ||
662 | int videobuf_streamoff(struct videobuf_queue *q) | |
663 | { | |
664 | int retval; | |
665 | ||
666 | mutex_lock(&q->lock); | |
667 | retval = __videobuf_streamoff(q); | |
7a7d9a89 | 668 | mutex_unlock(&q->lock); |
19bc5133 | 669 | |
7a7d9a89 MCC |
670 | return retval; |
671 | } | |
672 | ||
19bc5133 | 673 | /* Locking: Caller holds q->lock */ |
7a7d9a89 MCC |
674 | static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q, |
675 | char __user *data, | |
676 | size_t count, loff_t *ppos) | |
677 | { | |
678 | enum v4l2_field field; | |
679 | unsigned long flags=0; | |
680 | int retval; | |
681 | ||
682 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); | |
683 | ||
684 | /* setup stuff */ | |
685 | q->read_buf = videobuf_alloc(q); | |
686 | if (NULL == q->read_buf) | |
687 | return -ENOMEM; | |
688 | ||
689 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
690 | q->read_buf->baddr = (unsigned long)data; | |
691 | q->read_buf->bsize = count; | |
692 | ||
693 | field = videobuf_next_field(q); | |
694 | retval = q->ops->buf_prepare(q,q->read_buf,field); | |
695 | if (0 != retval) | |
696 | goto done; | |
697 | ||
698 | /* start capture & wait */ | |
699 | if (q->irqlock) | |
700 | spin_lock_irqsave(q->irqlock,flags); | |
701 | q->ops->buf_queue(q,q->read_buf); | |
702 | if (q->irqlock) | |
703 | spin_unlock_irqrestore(q->irqlock,flags); | |
704 | retval = videobuf_waiton(q->read_buf,0,0); | |
705 | if (0 == retval) { | |
706 | CALL(q,sync,q,q->read_buf); | |
707 | if (STATE_ERROR == q->read_buf->state) | |
708 | retval = -EIO; | |
709 | else | |
710 | retval = q->read_buf->size; | |
711 | } | |
712 | ||
713 | done: | |
714 | /* cleanup */ | |
715 | q->ops->buf_release(q,q->read_buf); | |
716 | kfree(q->read_buf); | |
717 | q->read_buf = NULL; | |
718 | return retval; | |
719 | } | |
720 | ||
721 | ssize_t videobuf_read_one(struct videobuf_queue *q, | |
722 | char __user *data, size_t count, loff_t *ppos, | |
723 | int nonblocking) | |
724 | { | |
725 | enum v4l2_field field; | |
726 | unsigned long flags=0; | |
727 | unsigned size, nbufs; | |
728 | int retval; | |
729 | ||
730 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); | |
731 | ||
732 | mutex_lock(&q->lock); | |
733 | ||
734 | nbufs = 1; size = 0; | |
735 | q->ops->buf_setup(q,&nbufs,&size); | |
736 | ||
737 | if (NULL == q->read_buf && | |
738 | count >= size && | |
739 | !nonblocking) { | |
740 | retval = videobuf_read_zerocopy(q,data,count,ppos); | |
741 | if (retval >= 0 || retval == -EIO) | |
742 | /* ok, all done */ | |
743 | goto done; | |
744 | /* fallback to kernel bounce buffer on failures */ | |
745 | } | |
746 | ||
747 | if (NULL == q->read_buf) { | |
748 | /* need to capture a new frame */ | |
749 | retval = -ENOMEM; | |
750 | q->read_buf = videobuf_alloc(q); | |
751 | ||
752 | dprintk(1,"video alloc=0x%p\n", q->read_buf); | |
753 | if (NULL == q->read_buf) | |
754 | goto done; | |
755 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
756 | q->read_buf->bsize = count; /* preferred size */ | |
757 | field = videobuf_next_field(q); | |
758 | retval = q->ops->buf_prepare(q,q->read_buf,field); | |
759 | ||
760 | if (0 != retval) { | |
761 | kfree (q->read_buf); | |
762 | q->read_buf = NULL; | |
763 | goto done; | |
764 | } | |
765 | if (q->irqlock) | |
766 | spin_lock_irqsave(q->irqlock,flags); | |
767 | ||
768 | q->ops->buf_queue(q,q->read_buf); | |
769 | if (q->irqlock) | |
770 | spin_unlock_irqrestore(q->irqlock,flags); | |
771 | q->read_off = 0; | |
772 | } | |
773 | ||
774 | /* wait until capture is done */ | |
775 | retval = videobuf_waiton(q->read_buf, nonblocking, 1); | |
776 | if (0 != retval) | |
777 | goto done; | |
778 | ||
779 | CALL(q,sync,q,q->read_buf); | |
780 | ||
781 | if (STATE_ERROR == q->read_buf->state) { | |
782 | /* catch I/O errors */ | |
783 | q->ops->buf_release(q,q->read_buf); | |
784 | kfree(q->read_buf); | |
785 | q->read_buf = NULL; | |
786 | retval = -EIO; | |
787 | goto done; | |
788 | } | |
789 | ||
790 | /* Copy to userspace */ | |
13bcd5d0 | 791 | retval=CALL(q,video_copy_to_user,q,data,count,nonblocking); |
7a7d9a89 MCC |
792 | if (retval<0) |
793 | goto done; | |
794 | ||
795 | q->read_off += retval; | |
796 | if (q->read_off == q->read_buf->size) { | |
797 | /* all data copied, cleanup */ | |
798 | q->ops->buf_release(q,q->read_buf); | |
799 | kfree(q->read_buf); | |
800 | q->read_buf = NULL; | |
801 | } | |
802 | ||
803 | done: | |
804 | mutex_unlock(&q->lock); | |
805 | return retval; | |
806 | } | |
807 | ||
19bc5133 | 808 | /* Locking: Caller holds q->lock */ |
19fb1457 | 809 | int __videobuf_read_start(struct videobuf_queue *q) |
7a7d9a89 MCC |
810 | { |
811 | enum v4l2_field field; | |
812 | unsigned long flags=0; | |
49ee718e | 813 | unsigned int count = 0, size = 0; |
7a7d9a89 MCC |
814 | int err, i; |
815 | ||
816 | q->ops->buf_setup(q,&count,&size); | |
817 | if (count < 2) | |
818 | count = 2; | |
819 | if (count > VIDEO_MAX_FRAME) | |
820 | count = VIDEO_MAX_FRAME; | |
821 | size = PAGE_ALIGN(size); | |
822 | ||
19bc5133 | 823 | err = __videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR); |
49ee718e | 824 | if (err < 0) |
7a7d9a89 MCC |
825 | return err; |
826 | ||
49ee718e BP |
827 | count = err; |
828 | ||
7a7d9a89 MCC |
829 | for (i = 0; i < count; i++) { |
830 | field = videobuf_next_field(q); | |
831 | err = q->ops->buf_prepare(q,q->bufs[i],field); | |
832 | if (err) | |
833 | return err; | |
834 | list_add_tail(&q->bufs[i]->stream, &q->stream); | |
835 | } | |
836 | if (q->irqlock) | |
837 | spin_lock_irqsave(q->irqlock,flags); | |
838 | for (i = 0; i < count; i++) | |
839 | q->ops->buf_queue(q,q->bufs[i]); | |
840 | if (q->irqlock) | |
841 | spin_unlock_irqrestore(q->irqlock,flags); | |
842 | q->reading = 1; | |
843 | return 0; | |
844 | } | |
845 | ||
19bc5133 | 846 | static void __videobuf_read_stop(struct videobuf_queue *q) |
7a7d9a89 MCC |
847 | { |
848 | int i; | |
849 | ||
19bc5133 | 850 | |
7a7d9a89 | 851 | videobuf_queue_cancel(q); |
19bc5133 | 852 | __videobuf_mmap_free(q); |
7a7d9a89 MCC |
853 | INIT_LIST_HEAD(&q->stream); |
854 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
855 | if (NULL == q->bufs[i]) | |
856 | continue; | |
857 | kfree(q->bufs[i]); | |
858 | q->bufs[i] = NULL; | |
859 | } | |
860 | q->read_buf = NULL; | |
861 | q->reading = 0; | |
19bc5133 BP |
862 | |
863 | } | |
864 | ||
19fb1457 MCC |
865 | int videobuf_read_start(struct videobuf_queue *q) |
866 | { | |
867 | int rc; | |
868 | ||
869 | mutex_lock(&q->lock); | |
870 | rc = __videobuf_read_start(q); | |
871 | mutex_unlock(&q->lock); | |
872 | ||
873 | return rc; | |
874 | } | |
875 | ||
19bc5133 BP |
876 | void videobuf_read_stop(struct videobuf_queue *q) |
877 | { | |
878 | mutex_lock(&q->lock); | |
879 | __videobuf_read_stop(q); | |
880 | mutex_unlock(&q->lock); | |
881 | } | |
882 | ||
883 | void videobuf_stop(struct videobuf_queue *q) | |
884 | { | |
885 | mutex_lock(&q->lock); | |
886 | ||
887 | if (q->streaming) | |
888 | __videobuf_streamoff(q); | |
889 | ||
890 | if (q->reading) | |
891 | __videobuf_read_stop(q); | |
892 | ||
893 | mutex_unlock(&q->lock); | |
7a7d9a89 MCC |
894 | } |
895 | ||
19bc5133 | 896 | |
7a7d9a89 MCC |
897 | ssize_t videobuf_read_stream(struct videobuf_queue *q, |
898 | char __user *data, size_t count, loff_t *ppos, | |
899 | int vbihack, int nonblocking) | |
900 | { | |
901 | int rc, retval; | |
902 | unsigned long flags=0; | |
903 | ||
904 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); | |
905 | ||
906 | dprintk(2,"%s\n",__FUNCTION__); | |
907 | mutex_lock(&q->lock); | |
908 | retval = -EBUSY; | |
909 | if (q->streaming) | |
910 | goto done; | |
911 | if (!q->reading) { | |
912 | retval = videobuf_read_start(q); | |
913 | if (retval < 0) | |
914 | goto done; | |
915 | } | |
916 | ||
917 | retval = 0; | |
918 | while (count > 0) { | |
919 | /* get / wait for data */ | |
920 | if (NULL == q->read_buf) { | |
921 | q->read_buf = list_entry(q->stream.next, | |
922 | struct videobuf_buffer, | |
923 | stream); | |
924 | list_del(&q->read_buf->stream); | |
925 | q->read_off = 0; | |
926 | } | |
927 | rc = videobuf_waiton(q->read_buf, nonblocking, 1); | |
928 | if (rc < 0) { | |
929 | if (0 == retval) | |
930 | retval = rc; | |
931 | break; | |
932 | } | |
933 | ||
934 | if (q->read_buf->state == STATE_DONE) { | |
d00cd298 | 935 | rc = CALL (q,copy_stream, q, data + retval, count, |
7a7d9a89 MCC |
936 | retval, vbihack, nonblocking); |
937 | if (rc < 0) { | |
938 | retval = rc; | |
939 | break; | |
940 | } | |
941 | retval += rc; | |
942 | count -= rc; | |
943 | q->read_off += rc; | |
944 | } else { | |
945 | /* some error */ | |
946 | q->read_off = q->read_buf->size; | |
947 | if (0 == retval) | |
948 | retval = -EIO; | |
949 | } | |
950 | ||
951 | /* requeue buffer when done with copying */ | |
952 | if (q->read_off == q->read_buf->size) { | |
953 | list_add_tail(&q->read_buf->stream, | |
954 | &q->stream); | |
955 | if (q->irqlock) | |
956 | spin_lock_irqsave(q->irqlock,flags); | |
957 | q->ops->buf_queue(q,q->read_buf); | |
958 | if (q->irqlock) | |
959 | spin_unlock_irqrestore(q->irqlock,flags); | |
960 | q->read_buf = NULL; | |
961 | } | |
962 | if (retval < 0) | |
963 | break; | |
964 | } | |
965 | ||
966 | done: | |
967 | mutex_unlock(&q->lock); | |
968 | return retval; | |
969 | } | |
970 | ||
971 | unsigned int videobuf_poll_stream(struct file *file, | |
972 | struct videobuf_queue *q, | |
973 | poll_table *wait) | |
974 | { | |
975 | struct videobuf_buffer *buf = NULL; | |
976 | unsigned int rc = 0; | |
977 | ||
978 | mutex_lock(&q->lock); | |
979 | if (q->streaming) { | |
980 | if (!list_empty(&q->stream)) | |
981 | buf = list_entry(q->stream.next, | |
982 | struct videobuf_buffer, stream); | |
983 | } else { | |
984 | if (!q->reading) | |
985 | videobuf_read_start(q); | |
986 | if (!q->reading) { | |
987 | rc = POLLERR; | |
988 | } else if (NULL == q->read_buf) { | |
989 | q->read_buf = list_entry(q->stream.next, | |
990 | struct videobuf_buffer, | |
991 | stream); | |
992 | list_del(&q->read_buf->stream); | |
993 | q->read_off = 0; | |
994 | } | |
995 | buf = q->read_buf; | |
996 | } | |
997 | if (!buf) | |
998 | rc = POLLERR; | |
999 | ||
1000 | if (0 == rc) { | |
1001 | poll_wait(file, &buf->done, wait); | |
1002 | if (buf->state == STATE_DONE || | |
1003 | buf->state == STATE_ERROR) | |
1004 | rc = POLLIN|POLLRDNORM; | |
1005 | } | |
1006 | mutex_unlock(&q->lock); | |
1007 | return rc; | |
1008 | } | |
1009 | ||
7a7d9a89 MCC |
1010 | int videobuf_mmap_mapper(struct videobuf_queue *q, |
1011 | struct vm_area_struct *vma) | |
1012 | { | |
1013 | int retval; | |
1014 | ||
1015 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); | |
1016 | ||
1017 | mutex_lock(&q->lock); | |
1018 | retval=CALL(q,mmap_mapper,q,vma); | |
1019 | mutex_unlock(&q->lock); | |
1020 | ||
1021 | return retval; | |
1022 | } | |
1023 | ||
1024 | #ifdef CONFIG_VIDEO_V4L1_COMPAT | |
1025 | int videobuf_cgmbuf(struct videobuf_queue *q, | |
1026 | struct video_mbuf *mbuf, int count) | |
1027 | { | |
1028 | struct v4l2_requestbuffers req; | |
1029 | int rc,i; | |
1030 | ||
1031 | MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); | |
1032 | ||
1033 | memset(&req,0,sizeof(req)); | |
1034 | req.type = q->type; | |
1035 | req.count = count; | |
1036 | req.memory = V4L2_MEMORY_MMAP; | |
1037 | rc = videobuf_reqbufs(q,&req); | |
1038 | if (rc < 0) | |
1039 | return rc; | |
1040 | ||
1041 | mbuf->frames = req.count; | |
1042 | mbuf->size = 0; | |
1043 | for (i = 0; i < mbuf->frames; i++) { | |
1044 | mbuf->offsets[i] = q->bufs[i]->boff; | |
1045 | mbuf->size += q->bufs[i]->bsize; | |
1046 | } | |
1047 | ||
1048 | return 0; | |
1049 | } | |
a13625c5 | 1050 | EXPORT_SYMBOL_GPL(videobuf_cgmbuf); |
7a7d9a89 MCC |
1051 | #endif |
1052 | ||
1053 | /* --------------------------------------------------------------------- */ | |
1054 | ||
1055 | EXPORT_SYMBOL_GPL(videobuf_waiton); | |
1056 | EXPORT_SYMBOL_GPL(videobuf_iolock); | |
1057 | ||
1058 | EXPORT_SYMBOL_GPL(videobuf_alloc); | |
1059 | ||
d4cae5a5 | 1060 | EXPORT_SYMBOL_GPL(videobuf_queue_core_init); |
7a7d9a89 MCC |
1061 | EXPORT_SYMBOL_GPL(videobuf_queue_cancel); |
1062 | EXPORT_SYMBOL_GPL(videobuf_queue_is_busy); | |
1063 | ||
1064 | EXPORT_SYMBOL_GPL(videobuf_next_field); | |
1065 | EXPORT_SYMBOL_GPL(videobuf_reqbufs); | |
1066 | EXPORT_SYMBOL_GPL(videobuf_querybuf); | |
1067 | EXPORT_SYMBOL_GPL(videobuf_qbuf); | |
1068 | EXPORT_SYMBOL_GPL(videobuf_dqbuf); | |
7a7d9a89 MCC |
1069 | EXPORT_SYMBOL_GPL(videobuf_streamon); |
1070 | EXPORT_SYMBOL_GPL(videobuf_streamoff); | |
1071 | ||
19fb1457 | 1072 | EXPORT_SYMBOL_GPL(videobuf_read_start); |
7a7d9a89 | 1073 | EXPORT_SYMBOL_GPL(videobuf_read_stop); |
19bc5133 | 1074 | EXPORT_SYMBOL_GPL(videobuf_stop); |
7a7d9a89 MCC |
1075 | EXPORT_SYMBOL_GPL(videobuf_read_stream); |
1076 | EXPORT_SYMBOL_GPL(videobuf_read_one); | |
1077 | EXPORT_SYMBOL_GPL(videobuf_poll_stream); | |
1078 | ||
1079 | EXPORT_SYMBOL_GPL(videobuf_mmap_setup); | |
1080 | EXPORT_SYMBOL_GPL(videobuf_mmap_free); | |
1081 | EXPORT_SYMBOL_GPL(videobuf_mmap_mapper); | |
1082 | ||
1083 | /* | |
1084 | * Local variables: | |
1085 | * c-basic-offset: 8 | |
1086 | * End: | |
1087 | */ |