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> | |
27ac792c | 19 | #include <linux/mm.h> |
7a7d9a89 MCC |
20 | #include <linux/slab.h> |
21 | #include <linux/interrupt.h> | |
22 | ||
23 | #include <media/videobuf-core.h> | |
24 | ||
25 | #define MAGIC_BUFFER 0x20070728 | |
e2c77314 MCC |
26 | #define MAGIC_CHECK(is, should) do { \ |
27 | if (unlikely((is) != (should))) { \ | |
28 | printk(KERN_ERR "magic mismatch: %x (expected %x)\n", is, should); \ | |
29 | BUG(); } } while (0) | |
7a7d9a89 | 30 | |
e2c77314 | 31 | static int debug; |
7a7d9a89 MCC |
32 | module_param(debug, int, 0644); |
33 | ||
34 | MODULE_DESCRIPTION("helper module to manage video4linux buffers"); | |
35 | MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>"); | |
36 | MODULE_LICENSE("GPL"); | |
37 | ||
e2c77314 MCC |
38 | #define dprintk(level, fmt, arg...) do { \ |
39 | if (debug >= level) \ | |
40 | printk(KERN_DEBUG "vbuf: " fmt , ## arg); } while (0) | |
7a7d9a89 MCC |
41 | |
42 | /* --------------------------------------------------------------------- */ | |
43 | ||
44 | #define CALL(q, f, arg...) \ | |
e2c77314 | 45 | ((q->int_ops->f) ? q->int_ops->f(arg) : 0) |
7a7d9a89 | 46 | |
e2c77314 | 47 | void *videobuf_alloc(struct videobuf_queue *q) |
7a7d9a89 MCC |
48 | { |
49 | struct videobuf_buffer *vb; | |
50 | ||
e2c77314 | 51 | BUG_ON(q->msize < sizeof(*vb)); |
7a7d9a89 MCC |
52 | |
53 | if (!q->int_ops || !q->int_ops->alloc) { | |
54 | printk(KERN_ERR "No specific ops defined!\n"); | |
55 | BUG(); | |
56 | } | |
57 | ||
58 | vb = q->int_ops->alloc(q->msize); | |
59 | ||
60 | if (NULL != vb) { | |
61 | init_waitqueue_head(&vb->done); | |
62 | vb->magic = MAGIC_BUFFER; | |
63 | } | |
64 | ||
65 | return vb; | |
66 | } | |
67 | ||
009a9059 BP |
68 | #define WAITON_CONDITION (vb->state != VIDEOBUF_ACTIVE &&\ |
69 | vb->state != VIDEOBUF_QUEUED) | |
7a7d9a89 MCC |
70 | int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr) |
71 | { | |
e2c77314 | 72 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
009a9059 BP |
73 | |
74 | if (non_blocking) { | |
75 | if (WAITON_CONDITION) | |
76 | return 0; | |
77 | else | |
78 | return -EAGAIN; | |
7a7d9a89 | 79 | } |
009a9059 BP |
80 | |
81 | if (intr) | |
82 | return wait_event_interruptible(vb->done, WAITON_CONDITION); | |
83 | else | |
84 | wait_event(vb->done, WAITON_CONDITION); | |
85 | ||
86 | return 0; | |
7a7d9a89 MCC |
87 | } |
88 | ||
e2c77314 | 89 | int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb, |
7a7d9a89 MCC |
90 | struct v4l2_framebuffer *fbuf) |
91 | { | |
e2c77314 MCC |
92 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
93 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
7a7d9a89 | 94 | |
e2c77314 | 95 | return CALL(q, iolock, q, vb, fbuf); |
7a7d9a89 MCC |
96 | } |
97 | ||
59d34489 MCC |
98 | void *videobuf_queue_to_vmalloc (struct videobuf_queue *q, |
99 | struct videobuf_buffer *buf) | |
100 | { | |
a6a3a17b HH |
101 | if (q->int_ops->vmalloc) |
102 | return q->int_ops->vmalloc(buf); | |
103 | else | |
104 | return NULL; | |
59d34489 MCC |
105 | } |
106 | EXPORT_SYMBOL_GPL(videobuf_queue_to_vmalloc); | |
107 | ||
7a7d9a89 MCC |
108 | /* --------------------------------------------------------------------- */ |
109 | ||
110 | ||
e2c77314 | 111 | void videobuf_queue_core_init(struct videobuf_queue *q, |
7a7d9a89 | 112 | struct videobuf_queue_ops *ops, |
e9bcf667 | 113 | struct device *dev, |
7a7d9a89 MCC |
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 | 120 | { |
e2c77314 | 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 */ | |
e2c77314 MCC |
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); | |
7a7d9a89 | 136 | |
0cf4daee BP |
137 | /* Lock is mandatory for queue_cancel to work */ |
138 | BUG_ON(!irqlock); | |
139 | ||
d4cae5a5 | 140 | /* Having implementations for abstract methods are mandatory */ |
e2c77314 | 141 | BUG_ON(!q->int_ops); |
d4cae5a5 | 142 | |
64f9477f | 143 | mutex_init(&q->vb_lock); |
137d1cb1 | 144 | init_waitqueue_head(&q->wait); |
7a7d9a89 MCC |
145 | INIT_LIST_HEAD(&q->stream); |
146 | } | |
147 | ||
19bc5133 | 148 | /* Locking: Only usage in bttv unsafe find way to remove */ |
7a7d9a89 MCC |
149 | int videobuf_queue_is_busy(struct videobuf_queue *q) |
150 | { | |
151 | int i; | |
152 | ||
e2c77314 | 153 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 MCC |
154 | |
155 | if (q->streaming) { | |
e2c77314 | 156 | dprintk(1, "busy: streaming active\n"); |
7a7d9a89 MCC |
157 | return 1; |
158 | } | |
159 | if (q->reading) { | |
e2c77314 | 160 | dprintk(1, "busy: pending read #1\n"); |
7a7d9a89 MCC |
161 | return 1; |
162 | } | |
163 | if (q->read_buf) { | |
e2c77314 | 164 | dprintk(1, "busy: pending read #2\n"); |
7a7d9a89 MCC |
165 | return 1; |
166 | } | |
167 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
168 | if (NULL == q->bufs[i]) | |
169 | continue; | |
851c0c96 | 170 | if (q->bufs[i]->map) { |
e2c77314 | 171 | dprintk(1, "busy: buffer #%d mapped\n", i); |
7a7d9a89 MCC |
172 | return 1; |
173 | } | |
0fc0686e | 174 | if (q->bufs[i]->state == VIDEOBUF_QUEUED) { |
e2c77314 | 175 | dprintk(1, "busy: buffer #%d queued\n", i); |
7a7d9a89 MCC |
176 | return 1; |
177 | } | |
0fc0686e | 178 | if (q->bufs[i]->state == VIDEOBUF_ACTIVE) { |
e2c77314 | 179 | dprintk(1, "busy: buffer #%d avtive\n", i); |
7a7d9a89 MCC |
180 | return 1; |
181 | } | |
182 | } | |
183 | return 0; | |
184 | } | |
185 | ||
64f9477f | 186 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
187 | void videobuf_queue_cancel(struct videobuf_queue *q) |
188 | { | |
e2c77314 | 189 | unsigned long flags = 0; |
7a7d9a89 MCC |
190 | int i; |
191 | ||
137d1cb1 BP |
192 | q->streaming = 0; |
193 | q->reading = 0; | |
194 | wake_up_interruptible_sync(&q->wait); | |
195 | ||
7a7d9a89 | 196 | /* remove queued buffers from list */ |
0cf4daee | 197 | spin_lock_irqsave(q->irqlock, flags); |
7a7d9a89 MCC |
198 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
199 | if (NULL == q->bufs[i]) | |
200 | continue; | |
0fc0686e | 201 | if (q->bufs[i]->state == VIDEOBUF_QUEUED) { |
7a7d9a89 | 202 | list_del(&q->bufs[i]->queue); |
0fc0686e | 203 | q->bufs[i]->state = VIDEOBUF_ERROR; |
b608f432 | 204 | wake_up_all(&q->bufs[i]->done); |
7a7d9a89 MCC |
205 | } |
206 | } | |
0cf4daee | 207 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
208 | |
209 | /* free all buffers + clear queue */ | |
210 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
211 | if (NULL == q->bufs[i]) | |
212 | continue; | |
e2c77314 | 213 | q->ops->buf_release(q, q->bufs[i]); |
7a7d9a89 MCC |
214 | } |
215 | INIT_LIST_HEAD(&q->stream); | |
216 | } | |
217 | ||
218 | /* --------------------------------------------------------------------- */ | |
219 | ||
64f9477f | 220 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
221 | enum v4l2_field videobuf_next_field(struct videobuf_queue *q) |
222 | { | |
223 | enum v4l2_field field = q->field; | |
224 | ||
225 | BUG_ON(V4L2_FIELD_ANY == field); | |
226 | ||
227 | if (V4L2_FIELD_ALTERNATE == field) { | |
228 | if (V4L2_FIELD_TOP == q->last) { | |
229 | field = V4L2_FIELD_BOTTOM; | |
230 | q->last = V4L2_FIELD_BOTTOM; | |
231 | } else { | |
232 | field = V4L2_FIELD_TOP; | |
233 | q->last = V4L2_FIELD_TOP; | |
234 | } | |
235 | } | |
236 | return field; | |
237 | } | |
238 | ||
64f9477f | 239 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
240 | static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b, |
241 | struct videobuf_buffer *vb, enum v4l2_buf_type type) | |
242 | { | |
e2c77314 MCC |
243 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
244 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
7a7d9a89 MCC |
245 | |
246 | b->index = vb->i; | |
247 | b->type = type; | |
248 | ||
249 | b->memory = vb->memory; | |
250 | switch (b->memory) { | |
251 | case V4L2_MEMORY_MMAP: | |
252 | b->m.offset = vb->boff; | |
253 | b->length = vb->bsize; | |
254 | break; | |
255 | case V4L2_MEMORY_USERPTR: | |
256 | b->m.userptr = vb->baddr; | |
257 | b->length = vb->bsize; | |
258 | break; | |
259 | case V4L2_MEMORY_OVERLAY: | |
260 | b->m.offset = vb->boff; | |
261 | break; | |
262 | } | |
263 | ||
264 | b->flags = 0; | |
851c0c96 | 265 | if (vb->map) |
7a7d9a89 MCC |
266 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
267 | ||
268 | switch (vb->state) { | |
0fc0686e BP |
269 | case VIDEOBUF_PREPARED: |
270 | case VIDEOBUF_QUEUED: | |
271 | case VIDEOBUF_ACTIVE: | |
7a7d9a89 MCC |
272 | b->flags |= V4L2_BUF_FLAG_QUEUED; |
273 | break; | |
0fc0686e BP |
274 | case VIDEOBUF_DONE: |
275 | case VIDEOBUF_ERROR: | |
7a7d9a89 MCC |
276 | b->flags |= V4L2_BUF_FLAG_DONE; |
277 | break; | |
0fc0686e BP |
278 | case VIDEOBUF_NEEDS_INIT: |
279 | case VIDEOBUF_IDLE: | |
7a7d9a89 MCC |
280 | /* nothing */ |
281 | break; | |
282 | } | |
283 | ||
284 | if (vb->input != UNSET) { | |
285 | b->flags |= V4L2_BUF_FLAG_INPUT; | |
286 | b->input = vb->input; | |
287 | } | |
288 | ||
289 | b->field = vb->field; | |
290 | b->timestamp = vb->ts; | |
291 | b->bytesused = vb->size; | |
292 | b->sequence = vb->field_count >> 1; | |
293 | } | |
294 | ||
64f9477f | 295 | /* Locking: Caller holds q->vb_lock */ |
19bc5133 BP |
296 | static int __videobuf_mmap_free(struct videobuf_queue *q) |
297 | { | |
298 | int i; | |
299 | int rc; | |
300 | ||
301 | if (!q) | |
302 | return 0; | |
303 | ||
e2c77314 | 304 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
19bc5133 | 305 | |
d05051c8 | 306 | |
e2c77314 | 307 | rc = CALL(q, mmap_free, q); |
d05051c8 MCC |
308 | |
309 | q->is_mmapped = 0; | |
310 | ||
e2c77314 | 311 | if (rc < 0) |
19bc5133 BP |
312 | return rc; |
313 | ||
314 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
315 | if (NULL == q->bufs[i]) | |
316 | continue; | |
e2c77314 | 317 | q->ops->buf_release(q, q->bufs[i]); |
19bc5133 BP |
318 | kfree(q->bufs[i]); |
319 | q->bufs[i] = NULL; | |
320 | } | |
321 | ||
322 | return rc; | |
323 | } | |
324 | ||
325 | int videobuf_mmap_free(struct videobuf_queue *q) | |
326 | { | |
327 | int ret; | |
64f9477f | 328 | mutex_lock(&q->vb_lock); |
19bc5133 | 329 | ret = __videobuf_mmap_free(q); |
64f9477f | 330 | mutex_unlock(&q->vb_lock); |
19bc5133 BP |
331 | return ret; |
332 | } | |
333 | ||
64f9477f | 334 | /* Locking: Caller holds q->vb_lock */ |
81b2dbca | 335 | int __videobuf_mmap_setup(struct videobuf_queue *q, |
19bc5133 BP |
336 | unsigned int bcount, unsigned int bsize, |
337 | enum v4l2_memory memory) | |
338 | { | |
339 | unsigned int i; | |
340 | int err; | |
341 | ||
e2c77314 | 342 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
19bc5133 BP |
343 | |
344 | err = __videobuf_mmap_free(q); | |
345 | if (0 != err) | |
346 | return err; | |
347 | ||
348 | /* Allocate and initialize buffers */ | |
349 | for (i = 0; i < bcount; i++) { | |
350 | q->bufs[i] = videobuf_alloc(q); | |
351 | ||
352 | if (q->bufs[i] == NULL) | |
353 | break; | |
354 | ||
355 | q->bufs[i]->i = i; | |
356 | q->bufs[i]->input = UNSET; | |
357 | q->bufs[i]->memory = memory; | |
358 | q->bufs[i]->bsize = bsize; | |
359 | switch (memory) { | |
360 | case V4L2_MEMORY_MMAP: | |
361 | q->bufs[i]->boff = bsize * i; | |
362 | break; | |
363 | case V4L2_MEMORY_USERPTR: | |
364 | case V4L2_MEMORY_OVERLAY: | |
365 | /* nothing */ | |
366 | break; | |
367 | } | |
368 | } | |
369 | ||
370 | if (!i) | |
371 | return -ENOMEM; | |
372 | ||
e2c77314 | 373 | dprintk(1, "mmap setup: %d buffers, %d bytes each\n", |
19bc5133 BP |
374 | i, bsize); |
375 | ||
376 | return i; | |
377 | } | |
378 | ||
379 | int videobuf_mmap_setup(struct videobuf_queue *q, | |
380 | unsigned int bcount, unsigned int bsize, | |
381 | enum v4l2_memory memory) | |
382 | { | |
383 | int ret; | |
64f9477f | 384 | mutex_lock(&q->vb_lock); |
19bc5133 | 385 | ret = __videobuf_mmap_setup(q, bcount, bsize, memory); |
64f9477f | 386 | mutex_unlock(&q->vb_lock); |
19bc5133 BP |
387 | return ret; |
388 | } | |
389 | ||
7a7d9a89 MCC |
390 | int videobuf_reqbufs(struct videobuf_queue *q, |
391 | struct v4l2_requestbuffers *req) | |
392 | { | |
e2c77314 | 393 | unsigned int size, count; |
7a7d9a89 MCC |
394 | int retval; |
395 | ||
7a7d9a89 | 396 | if (req->count < 1) { |
e2c77314 | 397 | dprintk(1, "reqbufs: count invalid (%d)\n", req->count); |
7a7d9a89 MCC |
398 | return -EINVAL; |
399 | } | |
19bc5133 | 400 | |
7a7d9a89 MCC |
401 | if (req->memory != V4L2_MEMORY_MMAP && |
402 | req->memory != V4L2_MEMORY_USERPTR && | |
403 | req->memory != V4L2_MEMORY_OVERLAY) { | |
e2c77314 | 404 | dprintk(1, "reqbufs: memory type invalid\n"); |
7a7d9a89 MCC |
405 | return -EINVAL; |
406 | } | |
407 | ||
64f9477f | 408 | mutex_lock(&q->vb_lock); |
19bc5133 | 409 | if (req->type != q->type) { |
e2c77314 | 410 | dprintk(1, "reqbufs: queue type invalid\n"); |
19bc5133 BP |
411 | retval = -EINVAL; |
412 | goto done; | |
413 | } | |
414 | ||
7a7d9a89 | 415 | if (q->streaming) { |
e2c77314 | 416 | dprintk(1, "reqbufs: streaming already exists\n"); |
00f98d08 BP |
417 | retval = -EBUSY; |
418 | goto done; | |
7a7d9a89 MCC |
419 | } |
420 | if (!list_empty(&q->stream)) { | |
e2c77314 | 421 | dprintk(1, "reqbufs: stream running\n"); |
00f98d08 BP |
422 | retval = -EBUSY; |
423 | goto done; | |
7a7d9a89 MCC |
424 | } |
425 | ||
7a7d9a89 MCC |
426 | count = req->count; |
427 | if (count > VIDEO_MAX_FRAME) | |
428 | count = VIDEO_MAX_FRAME; | |
429 | size = 0; | |
e2c77314 | 430 | q->ops->buf_setup(q, &count, &size); |
7a7d9a89 | 431 | size = PAGE_ALIGN(size); |
e2c77314 | 432 | dprintk(1, "reqbufs: bufs=%d, size=0x%x [%d pages total]\n", |
7a7d9a89 MCC |
433 | count, size, (count*size)>>PAGE_SHIFT); |
434 | ||
e2c77314 | 435 | retval = __videobuf_mmap_setup(q, count, size, req->memory); |
7a7d9a89 | 436 | if (retval < 0) { |
e2c77314 | 437 | dprintk(1, "reqbufs: mmap setup returned %d\n", retval); |
7a7d9a89 MCC |
438 | goto done; |
439 | } | |
440 | ||
49ee718e | 441 | req->count = retval; |
925d74ae | 442 | retval = 0; |
7a7d9a89 MCC |
443 | |
444 | done: | |
64f9477f | 445 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
446 | return retval; |
447 | } | |
448 | ||
449 | int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b) | |
450 | { | |
19bc5133 BP |
451 | int ret = -EINVAL; |
452 | ||
64f9477f | 453 | mutex_lock(&q->vb_lock); |
7a7d9a89 | 454 | if (unlikely(b->type != q->type)) { |
e2c77314 | 455 | dprintk(1, "querybuf: Wrong type.\n"); |
19bc5133 | 456 | goto done; |
7a7d9a89 | 457 | } |
223ffe5f | 458 | if (unlikely(b->index >= VIDEO_MAX_FRAME)) { |
e2c77314 | 459 | dprintk(1, "querybuf: index out of range.\n"); |
19bc5133 | 460 | goto done; |
7a7d9a89 MCC |
461 | } |
462 | if (unlikely(NULL == q->bufs[b->index])) { | |
e2c77314 | 463 | dprintk(1, "querybuf: buffer is null.\n"); |
19bc5133 | 464 | goto done; |
7a7d9a89 | 465 | } |
19bc5133 | 466 | |
e2c77314 | 467 | videobuf_status(q, b, q->bufs[b->index], q->type); |
19bc5133 BP |
468 | |
469 | ret = 0; | |
470 | done: | |
64f9477f | 471 | mutex_unlock(&q->vb_lock); |
19bc5133 | 472 | return ret; |
7a7d9a89 MCC |
473 | } |
474 | ||
475 | int videobuf_qbuf(struct videobuf_queue *q, | |
476 | struct v4l2_buffer *b) | |
477 | { | |
478 | struct videobuf_buffer *buf; | |
479 | enum v4l2_field field; | |
e2c77314 | 480 | unsigned long flags = 0; |
7a7d9a89 MCC |
481 | int retval; |
482 | ||
e2c77314 | 483 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 484 | |
9900132f ML |
485 | if (b->memory == V4L2_MEMORY_MMAP) |
486 | down_read(¤t->mm->mmap_sem); | |
487 | ||
64f9477f | 488 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
489 | retval = -EBUSY; |
490 | if (q->reading) { | |
e2c77314 | 491 | dprintk(1, "qbuf: Reading running...\n"); |
7a7d9a89 MCC |
492 | goto done; |
493 | } | |
494 | retval = -EINVAL; | |
495 | if (b->type != q->type) { | |
e2c77314 | 496 | dprintk(1, "qbuf: Wrong type.\n"); |
7a7d9a89 MCC |
497 | goto done; |
498 | } | |
223ffe5f | 499 | if (b->index >= VIDEO_MAX_FRAME) { |
e2c77314 | 500 | dprintk(1, "qbuf: index out of range.\n"); |
7a7d9a89 MCC |
501 | goto done; |
502 | } | |
503 | buf = q->bufs[b->index]; | |
504 | if (NULL == buf) { | |
e2c77314 | 505 | dprintk(1, "qbuf: buffer is null.\n"); |
7a7d9a89 MCC |
506 | goto done; |
507 | } | |
e2c77314 | 508 | MAGIC_CHECK(buf->magic, MAGIC_BUFFER); |
7a7d9a89 | 509 | if (buf->memory != b->memory) { |
e2c77314 | 510 | dprintk(1, "qbuf: memory type is wrong.\n"); |
7a7d9a89 MCC |
511 | goto done; |
512 | } | |
0fc0686e | 513 | if (buf->state != VIDEOBUF_NEEDS_INIT && buf->state != VIDEOBUF_IDLE) { |
e2c77314 | 514 | dprintk(1, "qbuf: buffer is already queued or active.\n"); |
7a7d9a89 MCC |
515 | goto done; |
516 | } | |
517 | ||
518 | if (b->flags & V4L2_BUF_FLAG_INPUT) { | |
519 | if (b->input >= q->inputs) { | |
e2c77314 | 520 | dprintk(1, "qbuf: wrong input.\n"); |
7a7d9a89 MCC |
521 | goto done; |
522 | } | |
523 | buf->input = b->input; | |
524 | } else { | |
525 | buf->input = UNSET; | |
526 | } | |
527 | ||
528 | switch (b->memory) { | |
529 | case V4L2_MEMORY_MMAP: | |
530 | if (0 == buf->baddr) { | |
e2c77314 MCC |
531 | dprintk(1, "qbuf: mmap requested " |
532 | "but buffer addr is zero!\n"); | |
7a7d9a89 MCC |
533 | goto done; |
534 | } | |
535 | break; | |
536 | case V4L2_MEMORY_USERPTR: | |
537 | if (b->length < buf->bsize) { | |
e2c77314 | 538 | dprintk(1, "qbuf: buffer length is not enough\n"); |
7a7d9a89 MCC |
539 | goto done; |
540 | } | |
e2c77314 MCC |
541 | if (VIDEOBUF_NEEDS_INIT != buf->state && |
542 | buf->baddr != b->m.userptr) | |
543 | q->ops->buf_release(q, buf); | |
7a7d9a89 MCC |
544 | buf->baddr = b->m.userptr; |
545 | break; | |
546 | case V4L2_MEMORY_OVERLAY: | |
547 | buf->boff = b->m.offset; | |
548 | break; | |
549 | default: | |
e2c77314 | 550 | dprintk(1, "qbuf: wrong memory type\n"); |
7a7d9a89 MCC |
551 | goto done; |
552 | } | |
553 | ||
e2c77314 | 554 | dprintk(1, "qbuf: requesting next field\n"); |
7a7d9a89 | 555 | field = videobuf_next_field(q); |
e2c77314 | 556 | retval = q->ops->buf_prepare(q, buf, field); |
7a7d9a89 | 557 | if (0 != retval) { |
e2c77314 | 558 | dprintk(1, "qbuf: buffer_prepare returned %d\n", retval); |
7a7d9a89 MCC |
559 | goto done; |
560 | } | |
561 | ||
e2c77314 | 562 | list_add_tail(&buf->stream, &q->stream); |
7a7d9a89 | 563 | if (q->streaming) { |
0cf4daee | 564 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 565 | q->ops->buf_queue(q, buf); |
0cf4daee | 566 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 | 567 | } |
e2c77314 | 568 | dprintk(1, "qbuf: succeded\n"); |
7a7d9a89 | 569 | retval = 0; |
137d1cb1 | 570 | wake_up_interruptible_sync(&q->wait); |
7a7d9a89 MCC |
571 | |
572 | done: | |
64f9477f | 573 | mutex_unlock(&q->vb_lock); |
9900132f ML |
574 | |
575 | if (b->memory == V4L2_MEMORY_MMAP) | |
576 | up_read(¤t->mm->mmap_sem); | |
577 | ||
7a7d9a89 MCC |
578 | return retval; |
579 | } | |
580 | ||
137d1cb1 BP |
581 | |
582 | /* Locking: Caller holds q->vb_lock */ | |
583 | static int stream_next_buffer_check_queue(struct videobuf_queue *q, int noblock) | |
7a7d9a89 | 584 | { |
7a7d9a89 MCC |
585 | int retval; |
586 | ||
137d1cb1 BP |
587 | checks: |
588 | if (!q->streaming) { | |
589 | dprintk(1, "next_buffer: Not streaming\n"); | |
590 | retval = -EINVAL; | |
7a7d9a89 MCC |
591 | goto done; |
592 | } | |
137d1cb1 | 593 | |
7a7d9a89 | 594 | if (list_empty(&q->stream)) { |
137d1cb1 BP |
595 | if (noblock) { |
596 | retval = -EAGAIN; | |
597 | dprintk(2, "next_buffer: no buffers to dequeue\n"); | |
598 | goto done; | |
599 | } else { | |
600 | dprintk(2, "next_buffer: waiting on buffer\n"); | |
601 | ||
602 | /* Drop lock to avoid deadlock with qbuf */ | |
603 | mutex_unlock(&q->vb_lock); | |
604 | ||
605 | /* Checking list_empty and streaming is safe without | |
606 | * locks because we goto checks to validate while | |
607 | * holding locks before proceeding */ | |
608 | retval = wait_event_interruptible(q->wait, | |
609 | !list_empty(&q->stream) || !q->streaming); | |
610 | mutex_lock(&q->vb_lock); | |
611 | ||
612 | if (retval) | |
613 | goto done; | |
614 | ||
615 | goto checks; | |
616 | } | |
7a7d9a89 | 617 | } |
137d1cb1 BP |
618 | |
619 | retval = 0; | |
620 | ||
621 | done: | |
622 | return retval; | |
623 | } | |
624 | ||
625 | ||
626 | /* Locking: Caller holds q->vb_lock */ | |
627 | static int stream_next_buffer(struct videobuf_queue *q, | |
628 | struct videobuf_buffer **vb, int nonblocking) | |
629 | { | |
630 | int retval; | |
631 | struct videobuf_buffer *buf = NULL; | |
632 | ||
633 | retval = stream_next_buffer_check_queue(q, nonblocking); | |
634 | if (retval) | |
635 | goto done; | |
636 | ||
7a7d9a89 MCC |
637 | buf = list_entry(q->stream.next, struct videobuf_buffer, stream); |
638 | retval = videobuf_waiton(buf, nonblocking, 1); | |
137d1cb1 BP |
639 | if (retval < 0) |
640 | goto done; | |
641 | ||
642 | *vb = buf; | |
643 | done: | |
644 | return retval; | |
645 | } | |
646 | ||
647 | int videobuf_dqbuf(struct videobuf_queue *q, | |
648 | struct v4l2_buffer *b, int nonblocking) | |
649 | { | |
650 | struct videobuf_buffer *buf = NULL; | |
651 | int retval; | |
652 | ||
653 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
654 | ||
e43d76b4 | 655 | mutex_lock(&q->vb_lock); |
137d1cb1 BP |
656 | |
657 | retval = stream_next_buffer(q, &buf, nonblocking); | |
7a7d9a89 | 658 | if (retval < 0) { |
137d1cb1 | 659 | dprintk(1, "dqbuf: next_buffer error: %i\n", retval); |
7a7d9a89 MCC |
660 | goto done; |
661 | } | |
137d1cb1 | 662 | |
7a7d9a89 | 663 | switch (buf->state) { |
0fc0686e | 664 | case VIDEOBUF_ERROR: |
e2c77314 | 665 | dprintk(1, "dqbuf: state is error\n"); |
7a7d9a89 | 666 | retval = -EIO; |
e2c77314 | 667 | CALL(q, sync, q, buf); |
0fc0686e | 668 | buf->state = VIDEOBUF_IDLE; |
7a7d9a89 | 669 | break; |
0fc0686e | 670 | case VIDEOBUF_DONE: |
e2c77314 MCC |
671 | dprintk(1, "dqbuf: state is done\n"); |
672 | CALL(q, sync, q, buf); | |
0fc0686e | 673 | buf->state = VIDEOBUF_IDLE; |
7a7d9a89 MCC |
674 | break; |
675 | default: | |
e2c77314 | 676 | dprintk(1, "dqbuf: state invalid\n"); |
7a7d9a89 MCC |
677 | retval = -EINVAL; |
678 | goto done; | |
679 | } | |
680 | list_del(&buf->stream); | |
e2c77314 MCC |
681 | memset(b, 0, sizeof(*b)); |
682 | videobuf_status(q, b, buf, q->type); | |
7a7d9a89 MCC |
683 | |
684 | done: | |
64f9477f | 685 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
686 | return retval; |
687 | } | |
688 | ||
689 | int videobuf_streamon(struct videobuf_queue *q) | |
690 | { | |
691 | struct videobuf_buffer *buf; | |
e2c77314 | 692 | unsigned long flags = 0; |
7a7d9a89 MCC |
693 | int retval; |
694 | ||
64f9477f | 695 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
696 | retval = -EBUSY; |
697 | if (q->reading) | |
698 | goto done; | |
699 | retval = 0; | |
700 | if (q->streaming) | |
701 | goto done; | |
702 | q->streaming = 1; | |
0cf4daee | 703 | spin_lock_irqsave(q->irqlock, flags); |
a991f44b | 704 | list_for_each_entry(buf, &q->stream, stream) |
0fc0686e | 705 | if (buf->state == VIDEOBUF_PREPARED) |
e2c77314 | 706 | q->ops->buf_queue(q, buf); |
0cf4daee | 707 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 | 708 | |
137d1cb1 | 709 | wake_up_interruptible_sync(&q->wait); |
7a7d9a89 | 710 | done: |
64f9477f | 711 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
712 | return retval; |
713 | } | |
714 | ||
64f9477f | 715 | /* Locking: Caller holds q->vb_lock */ |
19bc5133 | 716 | static int __videobuf_streamoff(struct videobuf_queue *q) |
7a7d9a89 | 717 | { |
7a7d9a89 | 718 | if (!q->streaming) |
19bc5133 BP |
719 | return -EINVAL; |
720 | ||
7a7d9a89 | 721 | videobuf_queue_cancel(q); |
7a7d9a89 | 722 | |
19bc5133 BP |
723 | return 0; |
724 | } | |
725 | ||
726 | int videobuf_streamoff(struct videobuf_queue *q) | |
727 | { | |
728 | int retval; | |
729 | ||
64f9477f | 730 | mutex_lock(&q->vb_lock); |
19bc5133 | 731 | retval = __videobuf_streamoff(q); |
64f9477f | 732 | mutex_unlock(&q->vb_lock); |
19bc5133 | 733 | |
7a7d9a89 MCC |
734 | return retval; |
735 | } | |
736 | ||
64f9477f | 737 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
738 | static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q, |
739 | char __user *data, | |
740 | size_t count, loff_t *ppos) | |
741 | { | |
742 | enum v4l2_field field; | |
e2c77314 | 743 | unsigned long flags = 0; |
7a7d9a89 MCC |
744 | int retval; |
745 | ||
e2c77314 | 746 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 MCC |
747 | |
748 | /* setup stuff */ | |
749 | q->read_buf = videobuf_alloc(q); | |
750 | if (NULL == q->read_buf) | |
751 | return -ENOMEM; | |
752 | ||
753 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
754 | q->read_buf->baddr = (unsigned long)data; | |
755 | q->read_buf->bsize = count; | |
756 | ||
757 | field = videobuf_next_field(q); | |
e2c77314 | 758 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
7a7d9a89 MCC |
759 | if (0 != retval) |
760 | goto done; | |
761 | ||
762 | /* start capture & wait */ | |
0cf4daee | 763 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 764 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee | 765 | spin_unlock_irqrestore(q->irqlock, flags); |
e2c77314 | 766 | retval = videobuf_waiton(q->read_buf, 0, 0); |
7a7d9a89 | 767 | if (0 == retval) { |
e2c77314 | 768 | CALL(q, sync, q, q->read_buf); |
0fc0686e | 769 | if (VIDEOBUF_ERROR == q->read_buf->state) |
7a7d9a89 MCC |
770 | retval = -EIO; |
771 | else | |
772 | retval = q->read_buf->size; | |
773 | } | |
774 | ||
775 | done: | |
776 | /* cleanup */ | |
e2c77314 | 777 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
778 | kfree(q->read_buf); |
779 | q->read_buf = NULL; | |
780 | return retval; | |
781 | } | |
782 | ||
783 | ssize_t videobuf_read_one(struct videobuf_queue *q, | |
784 | char __user *data, size_t count, loff_t *ppos, | |
785 | int nonblocking) | |
786 | { | |
787 | enum v4l2_field field; | |
e2c77314 | 788 | unsigned long flags = 0; |
7daa4a88 | 789 | unsigned size = 0, nbufs = 1; |
7a7d9a89 MCC |
790 | int retval; |
791 | ||
e2c77314 | 792 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 793 | |
64f9477f | 794 | mutex_lock(&q->vb_lock); |
7a7d9a89 | 795 | |
e2c77314 | 796 | q->ops->buf_setup(q, &nbufs, &size); |
7a7d9a89 MCC |
797 | |
798 | if (NULL == q->read_buf && | |
799 | count >= size && | |
800 | !nonblocking) { | |
e2c77314 | 801 | retval = videobuf_read_zerocopy(q, data, count, ppos); |
7a7d9a89 MCC |
802 | if (retval >= 0 || retval == -EIO) |
803 | /* ok, all done */ | |
804 | goto done; | |
805 | /* fallback to kernel bounce buffer on failures */ | |
806 | } | |
807 | ||
808 | if (NULL == q->read_buf) { | |
809 | /* need to capture a new frame */ | |
810 | retval = -ENOMEM; | |
811 | q->read_buf = videobuf_alloc(q); | |
812 | ||
e2c77314 | 813 | dprintk(1, "video alloc=0x%p\n", q->read_buf); |
7a7d9a89 MCC |
814 | if (NULL == q->read_buf) |
815 | goto done; | |
816 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
817 | q->read_buf->bsize = count; /* preferred size */ | |
818 | field = videobuf_next_field(q); | |
e2c77314 | 819 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
7a7d9a89 MCC |
820 | |
821 | if (0 != retval) { | |
e2c77314 | 822 | kfree(q->read_buf); |
7a7d9a89 MCC |
823 | q->read_buf = NULL; |
824 | goto done; | |
825 | } | |
7a7d9a89 | 826 | |
0cf4daee | 827 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 828 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee BP |
829 | spin_unlock_irqrestore(q->irqlock, flags); |
830 | ||
7a7d9a89 MCC |
831 | q->read_off = 0; |
832 | } | |
833 | ||
834 | /* wait until capture is done */ | |
835 | retval = videobuf_waiton(q->read_buf, nonblocking, 1); | |
836 | if (0 != retval) | |
837 | goto done; | |
838 | ||
e2c77314 | 839 | CALL(q, sync, q, q->read_buf); |
7a7d9a89 | 840 | |
0fc0686e | 841 | if (VIDEOBUF_ERROR == q->read_buf->state) { |
7a7d9a89 | 842 | /* catch I/O errors */ |
e2c77314 | 843 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
844 | kfree(q->read_buf); |
845 | q->read_buf = NULL; | |
846 | retval = -EIO; | |
847 | goto done; | |
848 | } | |
849 | ||
850 | /* Copy to userspace */ | |
e2c77314 MCC |
851 | retval = CALL(q, video_copy_to_user, q, data, count, nonblocking); |
852 | if (retval < 0) | |
7a7d9a89 MCC |
853 | goto done; |
854 | ||
855 | q->read_off += retval; | |
856 | if (q->read_off == q->read_buf->size) { | |
857 | /* all data copied, cleanup */ | |
e2c77314 | 858 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
859 | kfree(q->read_buf); |
860 | q->read_buf = NULL; | |
861 | } | |
862 | ||
863 | done: | |
64f9477f | 864 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
865 | return retval; |
866 | } | |
867 | ||
64f9477f | 868 | /* Locking: Caller holds q->vb_lock */ |
225ba900 | 869 | static int __videobuf_read_start(struct videobuf_queue *q) |
7a7d9a89 MCC |
870 | { |
871 | enum v4l2_field field; | |
e2c77314 | 872 | unsigned long flags = 0; |
49ee718e | 873 | unsigned int count = 0, size = 0; |
7a7d9a89 MCC |
874 | int err, i; |
875 | ||
e2c77314 | 876 | q->ops->buf_setup(q, &count, &size); |
7a7d9a89 MCC |
877 | if (count < 2) |
878 | count = 2; | |
879 | if (count > VIDEO_MAX_FRAME) | |
880 | count = VIDEO_MAX_FRAME; | |
881 | size = PAGE_ALIGN(size); | |
882 | ||
19bc5133 | 883 | err = __videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR); |
49ee718e | 884 | if (err < 0) |
7a7d9a89 MCC |
885 | return err; |
886 | ||
49ee718e BP |
887 | count = err; |
888 | ||
7a7d9a89 MCC |
889 | for (i = 0; i < count; i++) { |
890 | field = videobuf_next_field(q); | |
e2c77314 | 891 | err = q->ops->buf_prepare(q, q->bufs[i], field); |
7a7d9a89 MCC |
892 | if (err) |
893 | return err; | |
894 | list_add_tail(&q->bufs[i]->stream, &q->stream); | |
895 | } | |
0cf4daee | 896 | spin_lock_irqsave(q->irqlock, flags); |
7a7d9a89 | 897 | for (i = 0; i < count; i++) |
e2c77314 | 898 | q->ops->buf_queue(q, q->bufs[i]); |
0cf4daee | 899 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
900 | q->reading = 1; |
901 | return 0; | |
902 | } | |
903 | ||
19bc5133 | 904 | static void __videobuf_read_stop(struct videobuf_queue *q) |
7a7d9a89 MCC |
905 | { |
906 | int i; | |
907 | ||
908 | videobuf_queue_cancel(q); | |
19bc5133 | 909 | __videobuf_mmap_free(q); |
7a7d9a89 MCC |
910 | INIT_LIST_HEAD(&q->stream); |
911 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
912 | if (NULL == q->bufs[i]) | |
913 | continue; | |
914 | kfree(q->bufs[i]); | |
915 | q->bufs[i] = NULL; | |
916 | } | |
917 | q->read_buf = NULL; | |
e2c77314 | 918 | |
19bc5133 BP |
919 | } |
920 | ||
19fb1457 MCC |
921 | int videobuf_read_start(struct videobuf_queue *q) |
922 | { | |
923 | int rc; | |
924 | ||
64f9477f | 925 | mutex_lock(&q->vb_lock); |
19fb1457 | 926 | rc = __videobuf_read_start(q); |
64f9477f | 927 | mutex_unlock(&q->vb_lock); |
19fb1457 MCC |
928 | |
929 | return rc; | |
930 | } | |
931 | ||
19bc5133 BP |
932 | void videobuf_read_stop(struct videobuf_queue *q) |
933 | { | |
64f9477f | 934 | mutex_lock(&q->vb_lock); |
19bc5133 | 935 | __videobuf_read_stop(q); |
64f9477f | 936 | mutex_unlock(&q->vb_lock); |
19bc5133 BP |
937 | } |
938 | ||
939 | void videobuf_stop(struct videobuf_queue *q) | |
940 | { | |
64f9477f | 941 | mutex_lock(&q->vb_lock); |
19bc5133 BP |
942 | |
943 | if (q->streaming) | |
944 | __videobuf_streamoff(q); | |
945 | ||
946 | if (q->reading) | |
947 | __videobuf_read_stop(q); | |
948 | ||
64f9477f | 949 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
950 | } |
951 | ||
19bc5133 | 952 | |
7a7d9a89 MCC |
953 | ssize_t videobuf_read_stream(struct videobuf_queue *q, |
954 | char __user *data, size_t count, loff_t *ppos, | |
955 | int vbihack, int nonblocking) | |
956 | { | |
957 | int rc, retval; | |
e2c77314 | 958 | unsigned long flags = 0; |
7a7d9a89 | 959 | |
e2c77314 | 960 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 961 | |
7e28adb2 | 962 | dprintk(2, "%s\n", __func__); |
64f9477f | 963 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
964 | retval = -EBUSY; |
965 | if (q->streaming) | |
966 | goto done; | |
967 | if (!q->reading) { | |
3f84307a | 968 | retval = __videobuf_read_start(q); |
7a7d9a89 MCC |
969 | if (retval < 0) |
970 | goto done; | |
971 | } | |
972 | ||
973 | retval = 0; | |
974 | while (count > 0) { | |
975 | /* get / wait for data */ | |
976 | if (NULL == q->read_buf) { | |
977 | q->read_buf = list_entry(q->stream.next, | |
978 | struct videobuf_buffer, | |
979 | stream); | |
980 | list_del(&q->read_buf->stream); | |
981 | q->read_off = 0; | |
982 | } | |
983 | rc = videobuf_waiton(q->read_buf, nonblocking, 1); | |
984 | if (rc < 0) { | |
985 | if (0 == retval) | |
986 | retval = rc; | |
987 | break; | |
988 | } | |
989 | ||
0fc0686e | 990 | if (q->read_buf->state == VIDEOBUF_DONE) { |
e2c77314 | 991 | rc = CALL(q, copy_stream, q, data + retval, count, |
7a7d9a89 MCC |
992 | retval, vbihack, nonblocking); |
993 | if (rc < 0) { | |
994 | retval = rc; | |
995 | break; | |
996 | } | |
997 | retval += rc; | |
998 | count -= rc; | |
999 | q->read_off += rc; | |
1000 | } else { | |
1001 | /* some error */ | |
1002 | q->read_off = q->read_buf->size; | |
1003 | if (0 == retval) | |
1004 | retval = -EIO; | |
1005 | } | |
1006 | ||
1007 | /* requeue buffer when done with copying */ | |
1008 | if (q->read_off == q->read_buf->size) { | |
1009 | list_add_tail(&q->read_buf->stream, | |
1010 | &q->stream); | |
0cf4daee | 1011 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 1012 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee | 1013 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
1014 | q->read_buf = NULL; |
1015 | } | |
1016 | if (retval < 0) | |
1017 | break; | |
1018 | } | |
1019 | ||
1020 | done: | |
64f9477f | 1021 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
1022 | return retval; |
1023 | } | |
1024 | ||
1025 | unsigned int videobuf_poll_stream(struct file *file, | |
1026 | struct videobuf_queue *q, | |
1027 | poll_table *wait) | |
1028 | { | |
1029 | struct videobuf_buffer *buf = NULL; | |
1030 | unsigned int rc = 0; | |
1031 | ||
64f9477f | 1032 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
1033 | if (q->streaming) { |
1034 | if (!list_empty(&q->stream)) | |
1035 | buf = list_entry(q->stream.next, | |
1036 | struct videobuf_buffer, stream); | |
1037 | } else { | |
1038 | if (!q->reading) | |
3f84307a | 1039 | __videobuf_read_start(q); |
7a7d9a89 MCC |
1040 | if (!q->reading) { |
1041 | rc = POLLERR; | |
1042 | } else if (NULL == q->read_buf) { | |
1043 | q->read_buf = list_entry(q->stream.next, | |
1044 | struct videobuf_buffer, | |
1045 | stream); | |
1046 | list_del(&q->read_buf->stream); | |
1047 | q->read_off = 0; | |
1048 | } | |
1049 | buf = q->read_buf; | |
1050 | } | |
1051 | if (!buf) | |
1052 | rc = POLLERR; | |
1053 | ||
1054 | if (0 == rc) { | |
1055 | poll_wait(file, &buf->done, wait); | |
0fc0686e BP |
1056 | if (buf->state == VIDEOBUF_DONE || |
1057 | buf->state == VIDEOBUF_ERROR) | |
7a7d9a89 MCC |
1058 | rc = POLLIN|POLLRDNORM; |
1059 | } | |
64f9477f | 1060 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
1061 | return rc; |
1062 | } | |
1063 | ||
7a7d9a89 MCC |
1064 | int videobuf_mmap_mapper(struct videobuf_queue *q, |
1065 | struct vm_area_struct *vma) | |
1066 | { | |
1067 | int retval; | |
1068 | ||
e2c77314 | 1069 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1070 | |
64f9477f | 1071 | mutex_lock(&q->vb_lock); |
e2c77314 | 1072 | retval = CALL(q, mmap_mapper, q, vma); |
d05051c8 | 1073 | q->is_mmapped = 1; |
64f9477f | 1074 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
1075 | |
1076 | return retval; | |
1077 | } | |
1078 | ||
1079 | #ifdef CONFIG_VIDEO_V4L1_COMPAT | |
1080 | int videobuf_cgmbuf(struct videobuf_queue *q, | |
1081 | struct video_mbuf *mbuf, int count) | |
1082 | { | |
1083 | struct v4l2_requestbuffers req; | |
e2c77314 | 1084 | int rc, i; |
7a7d9a89 | 1085 | |
e2c77314 | 1086 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1087 | |
e2c77314 | 1088 | memset(&req, 0, sizeof(req)); |
7a7d9a89 MCC |
1089 | req.type = q->type; |
1090 | req.count = count; | |
1091 | req.memory = V4L2_MEMORY_MMAP; | |
e2c77314 | 1092 | rc = videobuf_reqbufs(q, &req); |
7a7d9a89 MCC |
1093 | if (rc < 0) |
1094 | return rc; | |
1095 | ||
1096 | mbuf->frames = req.count; | |
1097 | mbuf->size = 0; | |
1098 | for (i = 0; i < mbuf->frames; i++) { | |
1099 | mbuf->offsets[i] = q->bufs[i]->boff; | |
1100 | mbuf->size += q->bufs[i]->bsize; | |
1101 | } | |
1102 | ||
1103 | return 0; | |
1104 | } | |
a13625c5 | 1105 | EXPORT_SYMBOL_GPL(videobuf_cgmbuf); |
7a7d9a89 MCC |
1106 | #endif |
1107 | ||
1108 | /* --------------------------------------------------------------------- */ | |
1109 | ||
1110 | EXPORT_SYMBOL_GPL(videobuf_waiton); | |
1111 | EXPORT_SYMBOL_GPL(videobuf_iolock); | |
1112 | ||
1113 | EXPORT_SYMBOL_GPL(videobuf_alloc); | |
1114 | ||
d4cae5a5 | 1115 | EXPORT_SYMBOL_GPL(videobuf_queue_core_init); |
7a7d9a89 MCC |
1116 | EXPORT_SYMBOL_GPL(videobuf_queue_cancel); |
1117 | EXPORT_SYMBOL_GPL(videobuf_queue_is_busy); | |
1118 | ||
1119 | EXPORT_SYMBOL_GPL(videobuf_next_field); | |
1120 | EXPORT_SYMBOL_GPL(videobuf_reqbufs); | |
1121 | EXPORT_SYMBOL_GPL(videobuf_querybuf); | |
1122 | EXPORT_SYMBOL_GPL(videobuf_qbuf); | |
1123 | EXPORT_SYMBOL_GPL(videobuf_dqbuf); | |
7a7d9a89 MCC |
1124 | EXPORT_SYMBOL_GPL(videobuf_streamon); |
1125 | EXPORT_SYMBOL_GPL(videobuf_streamoff); | |
1126 | ||
19fb1457 | 1127 | EXPORT_SYMBOL_GPL(videobuf_read_start); |
7a7d9a89 | 1128 | EXPORT_SYMBOL_GPL(videobuf_read_stop); |
19bc5133 | 1129 | EXPORT_SYMBOL_GPL(videobuf_stop); |
7a7d9a89 MCC |
1130 | EXPORT_SYMBOL_GPL(videobuf_read_stream); |
1131 | EXPORT_SYMBOL_GPL(videobuf_read_one); | |
1132 | EXPORT_SYMBOL_GPL(videobuf_poll_stream); | |
1133 | ||
81b2dbca | 1134 | EXPORT_SYMBOL_GPL(__videobuf_mmap_setup); |
7a7d9a89 MCC |
1135 | EXPORT_SYMBOL_GPL(videobuf_mmap_setup); |
1136 | EXPORT_SYMBOL_GPL(videobuf_mmap_free); | |
1137 | EXPORT_SYMBOL_GPL(videobuf_mmap_mapper); |