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Commit | Line | Data |
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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; |
7a7d9a89 MCC |
442 | |
443 | done: | |
64f9477f | 444 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
445 | return retval; |
446 | } | |
447 | ||
448 | int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b) | |
449 | { | |
19bc5133 BP |
450 | int ret = -EINVAL; |
451 | ||
64f9477f | 452 | mutex_lock(&q->vb_lock); |
7a7d9a89 | 453 | if (unlikely(b->type != q->type)) { |
e2c77314 | 454 | dprintk(1, "querybuf: Wrong type.\n"); |
19bc5133 | 455 | goto done; |
7a7d9a89 MCC |
456 | } |
457 | if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) { | |
e2c77314 | 458 | dprintk(1, "querybuf: index out of range.\n"); |
19bc5133 | 459 | goto done; |
7a7d9a89 MCC |
460 | } |
461 | if (unlikely(NULL == q->bufs[b->index])) { | |
e2c77314 | 462 | dprintk(1, "querybuf: buffer is null.\n"); |
19bc5133 | 463 | goto done; |
7a7d9a89 | 464 | } |
19bc5133 | 465 | |
e2c77314 | 466 | videobuf_status(q, b, q->bufs[b->index], q->type); |
19bc5133 BP |
467 | |
468 | ret = 0; | |
469 | done: | |
64f9477f | 470 | mutex_unlock(&q->vb_lock); |
19bc5133 | 471 | return ret; |
7a7d9a89 MCC |
472 | } |
473 | ||
474 | int videobuf_qbuf(struct videobuf_queue *q, | |
475 | struct v4l2_buffer *b) | |
476 | { | |
477 | struct videobuf_buffer *buf; | |
478 | enum v4l2_field field; | |
e2c77314 | 479 | unsigned long flags = 0; |
7a7d9a89 MCC |
480 | int retval; |
481 | ||
e2c77314 | 482 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 483 | |
9900132f ML |
484 | if (b->memory == V4L2_MEMORY_MMAP) |
485 | down_read(¤t->mm->mmap_sem); | |
486 | ||
64f9477f | 487 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
488 | retval = -EBUSY; |
489 | if (q->reading) { | |
e2c77314 | 490 | dprintk(1, "qbuf: Reading running...\n"); |
7a7d9a89 MCC |
491 | goto done; |
492 | } | |
493 | retval = -EINVAL; | |
494 | if (b->type != q->type) { | |
e2c77314 | 495 | dprintk(1, "qbuf: Wrong type.\n"); |
7a7d9a89 MCC |
496 | goto done; |
497 | } | |
498 | if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) { | |
e2c77314 | 499 | dprintk(1, "qbuf: index out of range.\n"); |
7a7d9a89 MCC |
500 | goto done; |
501 | } | |
502 | buf = q->bufs[b->index]; | |
503 | if (NULL == buf) { | |
e2c77314 | 504 | dprintk(1, "qbuf: buffer is null.\n"); |
7a7d9a89 MCC |
505 | goto done; |
506 | } | |
e2c77314 | 507 | MAGIC_CHECK(buf->magic, MAGIC_BUFFER); |
7a7d9a89 | 508 | if (buf->memory != b->memory) { |
e2c77314 | 509 | dprintk(1, "qbuf: memory type is wrong.\n"); |
7a7d9a89 MCC |
510 | goto done; |
511 | } | |
0fc0686e | 512 | if (buf->state != VIDEOBUF_NEEDS_INIT && buf->state != VIDEOBUF_IDLE) { |
e2c77314 | 513 | dprintk(1, "qbuf: buffer is already queued or active.\n"); |
7a7d9a89 MCC |
514 | goto done; |
515 | } | |
516 | ||
517 | if (b->flags & V4L2_BUF_FLAG_INPUT) { | |
518 | if (b->input >= q->inputs) { | |
e2c77314 | 519 | dprintk(1, "qbuf: wrong input.\n"); |
7a7d9a89 MCC |
520 | goto done; |
521 | } | |
522 | buf->input = b->input; | |
523 | } else { | |
524 | buf->input = UNSET; | |
525 | } | |
526 | ||
527 | switch (b->memory) { | |
528 | case V4L2_MEMORY_MMAP: | |
529 | if (0 == buf->baddr) { | |
e2c77314 MCC |
530 | dprintk(1, "qbuf: mmap requested " |
531 | "but buffer addr is zero!\n"); | |
7a7d9a89 MCC |
532 | goto done; |
533 | } | |
534 | break; | |
535 | case V4L2_MEMORY_USERPTR: | |
536 | if (b->length < buf->bsize) { | |
e2c77314 | 537 | dprintk(1, "qbuf: buffer length is not enough\n"); |
7a7d9a89 MCC |
538 | goto done; |
539 | } | |
e2c77314 MCC |
540 | if (VIDEOBUF_NEEDS_INIT != buf->state && |
541 | buf->baddr != b->m.userptr) | |
542 | q->ops->buf_release(q, buf); | |
7a7d9a89 MCC |
543 | buf->baddr = b->m.userptr; |
544 | break; | |
545 | case V4L2_MEMORY_OVERLAY: | |
546 | buf->boff = b->m.offset; | |
547 | break; | |
548 | default: | |
e2c77314 | 549 | dprintk(1, "qbuf: wrong memory type\n"); |
7a7d9a89 MCC |
550 | goto done; |
551 | } | |
552 | ||
e2c77314 | 553 | dprintk(1, "qbuf: requesting next field\n"); |
7a7d9a89 | 554 | field = videobuf_next_field(q); |
e2c77314 | 555 | retval = q->ops->buf_prepare(q, buf, field); |
7a7d9a89 | 556 | if (0 != retval) { |
e2c77314 | 557 | dprintk(1, "qbuf: buffer_prepare returned %d\n", retval); |
7a7d9a89 MCC |
558 | goto done; |
559 | } | |
560 | ||
e2c77314 | 561 | list_add_tail(&buf->stream, &q->stream); |
7a7d9a89 | 562 | if (q->streaming) { |
0cf4daee | 563 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 564 | q->ops->buf_queue(q, buf); |
0cf4daee | 565 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 | 566 | } |
e2c77314 | 567 | dprintk(1, "qbuf: succeded\n"); |
7a7d9a89 | 568 | retval = 0; |
137d1cb1 | 569 | wake_up_interruptible_sync(&q->wait); |
7a7d9a89 MCC |
570 | |
571 | done: | |
64f9477f | 572 | mutex_unlock(&q->vb_lock); |
9900132f ML |
573 | |
574 | if (b->memory == V4L2_MEMORY_MMAP) | |
575 | up_read(¤t->mm->mmap_sem); | |
576 | ||
7a7d9a89 MCC |
577 | return retval; |
578 | } | |
579 | ||
137d1cb1 BP |
580 | |
581 | /* Locking: Caller holds q->vb_lock */ | |
582 | static int stream_next_buffer_check_queue(struct videobuf_queue *q, int noblock) | |
7a7d9a89 | 583 | { |
7a7d9a89 MCC |
584 | int retval; |
585 | ||
137d1cb1 BP |
586 | checks: |
587 | if (!q->streaming) { | |
588 | dprintk(1, "next_buffer: Not streaming\n"); | |
589 | retval = -EINVAL; | |
7a7d9a89 MCC |
590 | goto done; |
591 | } | |
137d1cb1 | 592 | |
7a7d9a89 | 593 | if (list_empty(&q->stream)) { |
137d1cb1 BP |
594 | if (noblock) { |
595 | retval = -EAGAIN; | |
596 | dprintk(2, "next_buffer: no buffers to dequeue\n"); | |
597 | goto done; | |
598 | } else { | |
599 | dprintk(2, "next_buffer: waiting on buffer\n"); | |
600 | ||
601 | /* Drop lock to avoid deadlock with qbuf */ | |
602 | mutex_unlock(&q->vb_lock); | |
603 | ||
604 | /* Checking list_empty and streaming is safe without | |
605 | * locks because we goto checks to validate while | |
606 | * holding locks before proceeding */ | |
607 | retval = wait_event_interruptible(q->wait, | |
608 | !list_empty(&q->stream) || !q->streaming); | |
609 | mutex_lock(&q->vb_lock); | |
610 | ||
611 | if (retval) | |
612 | goto done; | |
613 | ||
614 | goto checks; | |
615 | } | |
7a7d9a89 | 616 | } |
137d1cb1 BP |
617 | |
618 | retval = 0; | |
619 | ||
620 | done: | |
621 | return retval; | |
622 | } | |
623 | ||
624 | ||
625 | /* Locking: Caller holds q->vb_lock */ | |
626 | static int stream_next_buffer(struct videobuf_queue *q, | |
627 | struct videobuf_buffer **vb, int nonblocking) | |
628 | { | |
629 | int retval; | |
630 | struct videobuf_buffer *buf = NULL; | |
631 | ||
632 | retval = stream_next_buffer_check_queue(q, nonblocking); | |
633 | if (retval) | |
634 | goto done; | |
635 | ||
7a7d9a89 MCC |
636 | buf = list_entry(q->stream.next, struct videobuf_buffer, stream); |
637 | retval = videobuf_waiton(buf, nonblocking, 1); | |
137d1cb1 BP |
638 | if (retval < 0) |
639 | goto done; | |
640 | ||
641 | *vb = buf; | |
642 | done: | |
643 | return retval; | |
644 | } | |
645 | ||
646 | int videobuf_dqbuf(struct videobuf_queue *q, | |
647 | struct v4l2_buffer *b, int nonblocking) | |
648 | { | |
649 | struct videobuf_buffer *buf = NULL; | |
650 | int retval; | |
651 | ||
652 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
653 | ||
e43d76b4 | 654 | mutex_lock(&q->vb_lock); |
137d1cb1 BP |
655 | |
656 | retval = stream_next_buffer(q, &buf, nonblocking); | |
7a7d9a89 | 657 | if (retval < 0) { |
137d1cb1 | 658 | dprintk(1, "dqbuf: next_buffer error: %i\n", retval); |
7a7d9a89 MCC |
659 | goto done; |
660 | } | |
137d1cb1 | 661 | |
7a7d9a89 | 662 | switch (buf->state) { |
0fc0686e | 663 | case VIDEOBUF_ERROR: |
e2c77314 | 664 | dprintk(1, "dqbuf: state is error\n"); |
7a7d9a89 | 665 | retval = -EIO; |
e2c77314 | 666 | CALL(q, sync, q, buf); |
0fc0686e | 667 | buf->state = VIDEOBUF_IDLE; |
7a7d9a89 | 668 | break; |
0fc0686e | 669 | case VIDEOBUF_DONE: |
e2c77314 MCC |
670 | dprintk(1, "dqbuf: state is done\n"); |
671 | CALL(q, sync, q, buf); | |
0fc0686e | 672 | buf->state = VIDEOBUF_IDLE; |
7a7d9a89 MCC |
673 | break; |
674 | default: | |
e2c77314 | 675 | dprintk(1, "dqbuf: state invalid\n"); |
7a7d9a89 MCC |
676 | retval = -EINVAL; |
677 | goto done; | |
678 | } | |
679 | list_del(&buf->stream); | |
e2c77314 MCC |
680 | memset(b, 0, sizeof(*b)); |
681 | videobuf_status(q, b, buf, q->type); | |
7a7d9a89 MCC |
682 | |
683 | done: | |
64f9477f | 684 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
685 | return retval; |
686 | } | |
687 | ||
688 | int videobuf_streamon(struct videobuf_queue *q) | |
689 | { | |
690 | struct videobuf_buffer *buf; | |
e2c77314 | 691 | unsigned long flags = 0; |
7a7d9a89 MCC |
692 | int retval; |
693 | ||
64f9477f | 694 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
695 | retval = -EBUSY; |
696 | if (q->reading) | |
697 | goto done; | |
698 | retval = 0; | |
699 | if (q->streaming) | |
700 | goto done; | |
701 | q->streaming = 1; | |
0cf4daee | 702 | spin_lock_irqsave(q->irqlock, flags); |
a991f44b | 703 | list_for_each_entry(buf, &q->stream, stream) |
0fc0686e | 704 | if (buf->state == VIDEOBUF_PREPARED) |
e2c77314 | 705 | q->ops->buf_queue(q, buf); |
0cf4daee | 706 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 | 707 | |
137d1cb1 | 708 | wake_up_interruptible_sync(&q->wait); |
7a7d9a89 | 709 | done: |
64f9477f | 710 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
711 | return retval; |
712 | } | |
713 | ||
64f9477f | 714 | /* Locking: Caller holds q->vb_lock */ |
19bc5133 | 715 | static int __videobuf_streamoff(struct videobuf_queue *q) |
7a7d9a89 | 716 | { |
7a7d9a89 | 717 | if (!q->streaming) |
19bc5133 BP |
718 | return -EINVAL; |
719 | ||
7a7d9a89 | 720 | videobuf_queue_cancel(q); |
7a7d9a89 | 721 | |
19bc5133 BP |
722 | return 0; |
723 | } | |
724 | ||
725 | int videobuf_streamoff(struct videobuf_queue *q) | |
726 | { | |
727 | int retval; | |
728 | ||
64f9477f | 729 | mutex_lock(&q->vb_lock); |
19bc5133 | 730 | retval = __videobuf_streamoff(q); |
64f9477f | 731 | mutex_unlock(&q->vb_lock); |
19bc5133 | 732 | |
7a7d9a89 MCC |
733 | return retval; |
734 | } | |
735 | ||
64f9477f | 736 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
737 | static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q, |
738 | char __user *data, | |
739 | size_t count, loff_t *ppos) | |
740 | { | |
741 | enum v4l2_field field; | |
e2c77314 | 742 | unsigned long flags = 0; |
7a7d9a89 MCC |
743 | int retval; |
744 | ||
e2c77314 | 745 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 MCC |
746 | |
747 | /* setup stuff */ | |
748 | q->read_buf = videobuf_alloc(q); | |
749 | if (NULL == q->read_buf) | |
750 | return -ENOMEM; | |
751 | ||
752 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
753 | q->read_buf->baddr = (unsigned long)data; | |
754 | q->read_buf->bsize = count; | |
755 | ||
756 | field = videobuf_next_field(q); | |
e2c77314 | 757 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
7a7d9a89 MCC |
758 | if (0 != retval) |
759 | goto done; | |
760 | ||
761 | /* start capture & wait */ | |
0cf4daee | 762 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 763 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee | 764 | spin_unlock_irqrestore(q->irqlock, flags); |
e2c77314 | 765 | retval = videobuf_waiton(q->read_buf, 0, 0); |
7a7d9a89 | 766 | if (0 == retval) { |
e2c77314 | 767 | CALL(q, sync, q, q->read_buf); |
0fc0686e | 768 | if (VIDEOBUF_ERROR == q->read_buf->state) |
7a7d9a89 MCC |
769 | retval = -EIO; |
770 | else | |
771 | retval = q->read_buf->size; | |
772 | } | |
773 | ||
774 | done: | |
775 | /* cleanup */ | |
e2c77314 | 776 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
777 | kfree(q->read_buf); |
778 | q->read_buf = NULL; | |
779 | return retval; | |
780 | } | |
781 | ||
782 | ssize_t videobuf_read_one(struct videobuf_queue *q, | |
783 | char __user *data, size_t count, loff_t *ppos, | |
784 | int nonblocking) | |
785 | { | |
786 | enum v4l2_field field; | |
e2c77314 | 787 | unsigned long flags = 0; |
7daa4a88 | 788 | unsigned size = 0, nbufs = 1; |
7a7d9a89 MCC |
789 | int retval; |
790 | ||
e2c77314 | 791 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 792 | |
64f9477f | 793 | mutex_lock(&q->vb_lock); |
7a7d9a89 | 794 | |
e2c77314 | 795 | q->ops->buf_setup(q, &nbufs, &size); |
7a7d9a89 MCC |
796 | |
797 | if (NULL == q->read_buf && | |
798 | count >= size && | |
799 | !nonblocking) { | |
e2c77314 | 800 | retval = videobuf_read_zerocopy(q, data, count, ppos); |
7a7d9a89 MCC |
801 | if (retval >= 0 || retval == -EIO) |
802 | /* ok, all done */ | |
803 | goto done; | |
804 | /* fallback to kernel bounce buffer on failures */ | |
805 | } | |
806 | ||
807 | if (NULL == q->read_buf) { | |
808 | /* need to capture a new frame */ | |
809 | retval = -ENOMEM; | |
810 | q->read_buf = videobuf_alloc(q); | |
811 | ||
e2c77314 | 812 | dprintk(1, "video alloc=0x%p\n", q->read_buf); |
7a7d9a89 MCC |
813 | if (NULL == q->read_buf) |
814 | goto done; | |
815 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
816 | q->read_buf->bsize = count; /* preferred size */ | |
817 | field = videobuf_next_field(q); | |
e2c77314 | 818 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
7a7d9a89 MCC |
819 | |
820 | if (0 != retval) { | |
e2c77314 | 821 | kfree(q->read_buf); |
7a7d9a89 MCC |
822 | q->read_buf = NULL; |
823 | goto done; | |
824 | } | |
7a7d9a89 | 825 | |
0cf4daee | 826 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 827 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee BP |
828 | spin_unlock_irqrestore(q->irqlock, flags); |
829 | ||
7a7d9a89 MCC |
830 | q->read_off = 0; |
831 | } | |
832 | ||
833 | /* wait until capture is done */ | |
834 | retval = videobuf_waiton(q->read_buf, nonblocking, 1); | |
835 | if (0 != retval) | |
836 | goto done; | |
837 | ||
e2c77314 | 838 | CALL(q, sync, q, q->read_buf); |
7a7d9a89 | 839 | |
0fc0686e | 840 | if (VIDEOBUF_ERROR == q->read_buf->state) { |
7a7d9a89 | 841 | /* catch I/O errors */ |
e2c77314 | 842 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
843 | kfree(q->read_buf); |
844 | q->read_buf = NULL; | |
845 | retval = -EIO; | |
846 | goto done; | |
847 | } | |
848 | ||
849 | /* Copy to userspace */ | |
e2c77314 MCC |
850 | retval = CALL(q, video_copy_to_user, q, data, count, nonblocking); |
851 | if (retval < 0) | |
7a7d9a89 MCC |
852 | goto done; |
853 | ||
854 | q->read_off += retval; | |
855 | if (q->read_off == q->read_buf->size) { | |
856 | /* all data copied, cleanup */ | |
e2c77314 | 857 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
858 | kfree(q->read_buf); |
859 | q->read_buf = NULL; | |
860 | } | |
861 | ||
862 | done: | |
64f9477f | 863 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
864 | return retval; |
865 | } | |
866 | ||
64f9477f | 867 | /* Locking: Caller holds q->vb_lock */ |
225ba900 | 868 | static int __videobuf_read_start(struct videobuf_queue *q) |
7a7d9a89 MCC |
869 | { |
870 | enum v4l2_field field; | |
e2c77314 | 871 | unsigned long flags = 0; |
49ee718e | 872 | unsigned int count = 0, size = 0; |
7a7d9a89 MCC |
873 | int err, i; |
874 | ||
e2c77314 | 875 | q->ops->buf_setup(q, &count, &size); |
7a7d9a89 MCC |
876 | if (count < 2) |
877 | count = 2; | |
878 | if (count > VIDEO_MAX_FRAME) | |
879 | count = VIDEO_MAX_FRAME; | |
880 | size = PAGE_ALIGN(size); | |
881 | ||
19bc5133 | 882 | err = __videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR); |
49ee718e | 883 | if (err < 0) |
7a7d9a89 MCC |
884 | return err; |
885 | ||
49ee718e BP |
886 | count = err; |
887 | ||
7a7d9a89 MCC |
888 | for (i = 0; i < count; i++) { |
889 | field = videobuf_next_field(q); | |
e2c77314 | 890 | err = q->ops->buf_prepare(q, q->bufs[i], field); |
7a7d9a89 MCC |
891 | if (err) |
892 | return err; | |
893 | list_add_tail(&q->bufs[i]->stream, &q->stream); | |
894 | } | |
0cf4daee | 895 | spin_lock_irqsave(q->irqlock, flags); |
7a7d9a89 | 896 | for (i = 0; i < count; i++) |
e2c77314 | 897 | q->ops->buf_queue(q, q->bufs[i]); |
0cf4daee | 898 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
899 | q->reading = 1; |
900 | return 0; | |
901 | } | |
902 | ||
19bc5133 | 903 | static void __videobuf_read_stop(struct videobuf_queue *q) |
7a7d9a89 MCC |
904 | { |
905 | int i; | |
906 | ||
907 | videobuf_queue_cancel(q); | |
19bc5133 | 908 | __videobuf_mmap_free(q); |
7a7d9a89 MCC |
909 | INIT_LIST_HEAD(&q->stream); |
910 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
911 | if (NULL == q->bufs[i]) | |
912 | continue; | |
913 | kfree(q->bufs[i]); | |
914 | q->bufs[i] = NULL; | |
915 | } | |
916 | q->read_buf = NULL; | |
e2c77314 | 917 | |
19bc5133 BP |
918 | } |
919 | ||
19fb1457 MCC |
920 | int videobuf_read_start(struct videobuf_queue *q) |
921 | { | |
922 | int rc; | |
923 | ||
64f9477f | 924 | mutex_lock(&q->vb_lock); |
19fb1457 | 925 | rc = __videobuf_read_start(q); |
64f9477f | 926 | mutex_unlock(&q->vb_lock); |
19fb1457 MCC |
927 | |
928 | return rc; | |
929 | } | |
930 | ||
19bc5133 BP |
931 | void videobuf_read_stop(struct videobuf_queue *q) |
932 | { | |
64f9477f | 933 | mutex_lock(&q->vb_lock); |
19bc5133 | 934 | __videobuf_read_stop(q); |
64f9477f | 935 | mutex_unlock(&q->vb_lock); |
19bc5133 BP |
936 | } |
937 | ||
938 | void videobuf_stop(struct videobuf_queue *q) | |
939 | { | |
64f9477f | 940 | mutex_lock(&q->vb_lock); |
19bc5133 BP |
941 | |
942 | if (q->streaming) | |
943 | __videobuf_streamoff(q); | |
944 | ||
945 | if (q->reading) | |
946 | __videobuf_read_stop(q); | |
947 | ||
64f9477f | 948 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
949 | } |
950 | ||
19bc5133 | 951 | |
7a7d9a89 MCC |
952 | ssize_t videobuf_read_stream(struct videobuf_queue *q, |
953 | char __user *data, size_t count, loff_t *ppos, | |
954 | int vbihack, int nonblocking) | |
955 | { | |
956 | int rc, retval; | |
e2c77314 | 957 | unsigned long flags = 0; |
7a7d9a89 | 958 | |
e2c77314 | 959 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 960 | |
7e28adb2 | 961 | dprintk(2, "%s\n", __func__); |
64f9477f | 962 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
963 | retval = -EBUSY; |
964 | if (q->streaming) | |
965 | goto done; | |
966 | if (!q->reading) { | |
3f84307a | 967 | retval = __videobuf_read_start(q); |
7a7d9a89 MCC |
968 | if (retval < 0) |
969 | goto done; | |
970 | } | |
971 | ||
972 | retval = 0; | |
973 | while (count > 0) { | |
974 | /* get / wait for data */ | |
975 | if (NULL == q->read_buf) { | |
976 | q->read_buf = list_entry(q->stream.next, | |
977 | struct videobuf_buffer, | |
978 | stream); | |
979 | list_del(&q->read_buf->stream); | |
980 | q->read_off = 0; | |
981 | } | |
982 | rc = videobuf_waiton(q->read_buf, nonblocking, 1); | |
983 | if (rc < 0) { | |
984 | if (0 == retval) | |
985 | retval = rc; | |
986 | break; | |
987 | } | |
988 | ||
0fc0686e | 989 | if (q->read_buf->state == VIDEOBUF_DONE) { |
e2c77314 | 990 | rc = CALL(q, copy_stream, q, data + retval, count, |
7a7d9a89 MCC |
991 | retval, vbihack, nonblocking); |
992 | if (rc < 0) { | |
993 | retval = rc; | |
994 | break; | |
995 | } | |
996 | retval += rc; | |
997 | count -= rc; | |
998 | q->read_off += rc; | |
999 | } else { | |
1000 | /* some error */ | |
1001 | q->read_off = q->read_buf->size; | |
1002 | if (0 == retval) | |
1003 | retval = -EIO; | |
1004 | } | |
1005 | ||
1006 | /* requeue buffer when done with copying */ | |
1007 | if (q->read_off == q->read_buf->size) { | |
1008 | list_add_tail(&q->read_buf->stream, | |
1009 | &q->stream); | |
0cf4daee | 1010 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 1011 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee | 1012 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
1013 | q->read_buf = NULL; |
1014 | } | |
1015 | if (retval < 0) | |
1016 | break; | |
1017 | } | |
1018 | ||
1019 | done: | |
64f9477f | 1020 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
1021 | return retval; |
1022 | } | |
1023 | ||
1024 | unsigned int videobuf_poll_stream(struct file *file, | |
1025 | struct videobuf_queue *q, | |
1026 | poll_table *wait) | |
1027 | { | |
1028 | struct videobuf_buffer *buf = NULL; | |
1029 | unsigned int rc = 0; | |
1030 | ||
64f9477f | 1031 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
1032 | if (q->streaming) { |
1033 | if (!list_empty(&q->stream)) | |
1034 | buf = list_entry(q->stream.next, | |
1035 | struct videobuf_buffer, stream); | |
1036 | } else { | |
1037 | if (!q->reading) | |
3f84307a | 1038 | __videobuf_read_start(q); |
7a7d9a89 MCC |
1039 | if (!q->reading) { |
1040 | rc = POLLERR; | |
1041 | } else if (NULL == q->read_buf) { | |
1042 | q->read_buf = list_entry(q->stream.next, | |
1043 | struct videobuf_buffer, | |
1044 | stream); | |
1045 | list_del(&q->read_buf->stream); | |
1046 | q->read_off = 0; | |
1047 | } | |
1048 | buf = q->read_buf; | |
1049 | } | |
1050 | if (!buf) | |
1051 | rc = POLLERR; | |
1052 | ||
1053 | if (0 == rc) { | |
1054 | poll_wait(file, &buf->done, wait); | |
0fc0686e BP |
1055 | if (buf->state == VIDEOBUF_DONE || |
1056 | buf->state == VIDEOBUF_ERROR) | |
7a7d9a89 MCC |
1057 | rc = POLLIN|POLLRDNORM; |
1058 | } | |
64f9477f | 1059 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
1060 | return rc; |
1061 | } | |
1062 | ||
7a7d9a89 MCC |
1063 | int videobuf_mmap_mapper(struct videobuf_queue *q, |
1064 | struct vm_area_struct *vma) | |
1065 | { | |
1066 | int retval; | |
1067 | ||
e2c77314 | 1068 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1069 | |
64f9477f | 1070 | mutex_lock(&q->vb_lock); |
e2c77314 | 1071 | retval = CALL(q, mmap_mapper, q, vma); |
d05051c8 | 1072 | q->is_mmapped = 1; |
64f9477f | 1073 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
1074 | |
1075 | return retval; | |
1076 | } | |
1077 | ||
1078 | #ifdef CONFIG_VIDEO_V4L1_COMPAT | |
1079 | int videobuf_cgmbuf(struct videobuf_queue *q, | |
1080 | struct video_mbuf *mbuf, int count) | |
1081 | { | |
1082 | struct v4l2_requestbuffers req; | |
e2c77314 | 1083 | int rc, i; |
7a7d9a89 | 1084 | |
e2c77314 | 1085 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1086 | |
e2c77314 | 1087 | memset(&req, 0, sizeof(req)); |
7a7d9a89 MCC |
1088 | req.type = q->type; |
1089 | req.count = count; | |
1090 | req.memory = V4L2_MEMORY_MMAP; | |
e2c77314 | 1091 | rc = videobuf_reqbufs(q, &req); |
7a7d9a89 MCC |
1092 | if (rc < 0) |
1093 | return rc; | |
1094 | ||
1095 | mbuf->frames = req.count; | |
1096 | mbuf->size = 0; | |
1097 | for (i = 0; i < mbuf->frames; i++) { | |
1098 | mbuf->offsets[i] = q->bufs[i]->boff; | |
1099 | mbuf->size += q->bufs[i]->bsize; | |
1100 | } | |
1101 | ||
1102 | return 0; | |
1103 | } | |
a13625c5 | 1104 | EXPORT_SYMBOL_GPL(videobuf_cgmbuf); |
7a7d9a89 MCC |
1105 | #endif |
1106 | ||
1107 | /* --------------------------------------------------------------------- */ | |
1108 | ||
1109 | EXPORT_SYMBOL_GPL(videobuf_waiton); | |
1110 | EXPORT_SYMBOL_GPL(videobuf_iolock); | |
1111 | ||
1112 | EXPORT_SYMBOL_GPL(videobuf_alloc); | |
1113 | ||
d4cae5a5 | 1114 | EXPORT_SYMBOL_GPL(videobuf_queue_core_init); |
7a7d9a89 MCC |
1115 | EXPORT_SYMBOL_GPL(videobuf_queue_cancel); |
1116 | EXPORT_SYMBOL_GPL(videobuf_queue_is_busy); | |
1117 | ||
1118 | EXPORT_SYMBOL_GPL(videobuf_next_field); | |
1119 | EXPORT_SYMBOL_GPL(videobuf_reqbufs); | |
1120 | EXPORT_SYMBOL_GPL(videobuf_querybuf); | |
1121 | EXPORT_SYMBOL_GPL(videobuf_qbuf); | |
1122 | EXPORT_SYMBOL_GPL(videobuf_dqbuf); | |
7a7d9a89 MCC |
1123 | EXPORT_SYMBOL_GPL(videobuf_streamon); |
1124 | EXPORT_SYMBOL_GPL(videobuf_streamoff); | |
1125 | ||
19fb1457 | 1126 | EXPORT_SYMBOL_GPL(videobuf_read_start); |
7a7d9a89 | 1127 | EXPORT_SYMBOL_GPL(videobuf_read_stop); |
19bc5133 | 1128 | EXPORT_SYMBOL_GPL(videobuf_stop); |
7a7d9a89 MCC |
1129 | EXPORT_SYMBOL_GPL(videobuf_read_stream); |
1130 | EXPORT_SYMBOL_GPL(videobuf_read_one); | |
1131 | EXPORT_SYMBOL_GPL(videobuf_poll_stream); | |
1132 | ||
81b2dbca | 1133 | EXPORT_SYMBOL_GPL(__videobuf_mmap_setup); |
7a7d9a89 MCC |
1134 | EXPORT_SYMBOL_GPL(videobuf_mmap_setup); |
1135 | EXPORT_SYMBOL_GPL(videobuf_mmap_free); | |
1136 | EXPORT_SYMBOL_GPL(videobuf_mmap_mapper); |