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 | { |
96ceea27 | 121 | BUG_ON(!q); |
e2c77314 | 122 | memset(q, 0, sizeof(*q)); |
d4cae5a5 MCC |
123 | q->irqlock = irqlock; |
124 | q->dev = dev; | |
125 | q->type = type; | |
126 | q->field = field; | |
127 | q->msize = msize; | |
128 | q->ops = ops; | |
7a7d9a89 | 129 | q->priv_data = priv; |
d4cae5a5 | 130 | q->int_ops = int_ops; |
7a7d9a89 MCC |
131 | |
132 | /* All buffer operations are mandatory */ | |
e2c77314 MCC |
133 | BUG_ON(!q->ops->buf_setup); |
134 | BUG_ON(!q->ops->buf_prepare); | |
135 | BUG_ON(!q->ops->buf_queue); | |
136 | BUG_ON(!q->ops->buf_release); | |
7a7d9a89 | 137 | |
0cf4daee BP |
138 | /* Lock is mandatory for queue_cancel to work */ |
139 | BUG_ON(!irqlock); | |
140 | ||
d4cae5a5 | 141 | /* Having implementations for abstract methods are mandatory */ |
e2c77314 | 142 | BUG_ON(!q->int_ops); |
d4cae5a5 | 143 | |
64f9477f | 144 | mutex_init(&q->vb_lock); |
137d1cb1 | 145 | init_waitqueue_head(&q->wait); |
7a7d9a89 MCC |
146 | INIT_LIST_HEAD(&q->stream); |
147 | } | |
148 | ||
19bc5133 | 149 | /* Locking: Only usage in bttv unsafe find way to remove */ |
7a7d9a89 MCC |
150 | int videobuf_queue_is_busy(struct videobuf_queue *q) |
151 | { | |
152 | int i; | |
153 | ||
e2c77314 | 154 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 MCC |
155 | |
156 | if (q->streaming) { | |
e2c77314 | 157 | dprintk(1, "busy: streaming active\n"); |
7a7d9a89 MCC |
158 | return 1; |
159 | } | |
160 | if (q->reading) { | |
e2c77314 | 161 | dprintk(1, "busy: pending read #1\n"); |
7a7d9a89 MCC |
162 | return 1; |
163 | } | |
164 | if (q->read_buf) { | |
e2c77314 | 165 | dprintk(1, "busy: pending read #2\n"); |
7a7d9a89 MCC |
166 | return 1; |
167 | } | |
168 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
169 | if (NULL == q->bufs[i]) | |
170 | continue; | |
851c0c96 | 171 | if (q->bufs[i]->map) { |
e2c77314 | 172 | dprintk(1, "busy: buffer #%d mapped\n", i); |
7a7d9a89 MCC |
173 | return 1; |
174 | } | |
0fc0686e | 175 | if (q->bufs[i]->state == VIDEOBUF_QUEUED) { |
e2c77314 | 176 | dprintk(1, "busy: buffer #%d queued\n", i); |
7a7d9a89 MCC |
177 | return 1; |
178 | } | |
0fc0686e | 179 | if (q->bufs[i]->state == VIDEOBUF_ACTIVE) { |
e2c77314 | 180 | dprintk(1, "busy: buffer #%d avtive\n", i); |
7a7d9a89 MCC |
181 | return 1; |
182 | } | |
183 | } | |
184 | return 0; | |
185 | } | |
186 | ||
64f9477f | 187 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
188 | void videobuf_queue_cancel(struct videobuf_queue *q) |
189 | { | |
e2c77314 | 190 | unsigned long flags = 0; |
7a7d9a89 MCC |
191 | int i; |
192 | ||
137d1cb1 BP |
193 | q->streaming = 0; |
194 | q->reading = 0; | |
195 | wake_up_interruptible_sync(&q->wait); | |
196 | ||
7a7d9a89 | 197 | /* remove queued buffers from list */ |
0cf4daee | 198 | spin_lock_irqsave(q->irqlock, flags); |
7a7d9a89 MCC |
199 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
200 | if (NULL == q->bufs[i]) | |
201 | continue; | |
0fc0686e | 202 | if (q->bufs[i]->state == VIDEOBUF_QUEUED) { |
7a7d9a89 | 203 | list_del(&q->bufs[i]->queue); |
0fc0686e | 204 | q->bufs[i]->state = VIDEOBUF_ERROR; |
b608f432 | 205 | wake_up_all(&q->bufs[i]->done); |
7a7d9a89 MCC |
206 | } |
207 | } | |
0cf4daee | 208 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
209 | |
210 | /* free all buffers + clear queue */ | |
211 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
212 | if (NULL == q->bufs[i]) | |
213 | continue; | |
e2c77314 | 214 | q->ops->buf_release(q, q->bufs[i]); |
7a7d9a89 MCC |
215 | } |
216 | INIT_LIST_HEAD(&q->stream); | |
217 | } | |
218 | ||
219 | /* --------------------------------------------------------------------- */ | |
220 | ||
64f9477f | 221 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
222 | enum v4l2_field videobuf_next_field(struct videobuf_queue *q) |
223 | { | |
224 | enum v4l2_field field = q->field; | |
225 | ||
226 | BUG_ON(V4L2_FIELD_ANY == field); | |
227 | ||
228 | if (V4L2_FIELD_ALTERNATE == field) { | |
229 | if (V4L2_FIELD_TOP == q->last) { | |
230 | field = V4L2_FIELD_BOTTOM; | |
231 | q->last = V4L2_FIELD_BOTTOM; | |
232 | } else { | |
233 | field = V4L2_FIELD_TOP; | |
234 | q->last = V4L2_FIELD_TOP; | |
235 | } | |
236 | } | |
237 | return field; | |
238 | } | |
239 | ||
64f9477f | 240 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
241 | static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b, |
242 | struct videobuf_buffer *vb, enum v4l2_buf_type type) | |
243 | { | |
e2c77314 MCC |
244 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
245 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
7a7d9a89 MCC |
246 | |
247 | b->index = vb->i; | |
248 | b->type = type; | |
249 | ||
250 | b->memory = vb->memory; | |
251 | switch (b->memory) { | |
252 | case V4L2_MEMORY_MMAP: | |
253 | b->m.offset = vb->boff; | |
254 | b->length = vb->bsize; | |
255 | break; | |
256 | case V4L2_MEMORY_USERPTR: | |
257 | b->m.userptr = vb->baddr; | |
258 | b->length = vb->bsize; | |
259 | break; | |
260 | case V4L2_MEMORY_OVERLAY: | |
261 | b->m.offset = vb->boff; | |
262 | break; | |
263 | } | |
264 | ||
265 | b->flags = 0; | |
851c0c96 | 266 | if (vb->map) |
7a7d9a89 MCC |
267 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
268 | ||
269 | switch (vb->state) { | |
0fc0686e BP |
270 | case VIDEOBUF_PREPARED: |
271 | case VIDEOBUF_QUEUED: | |
272 | case VIDEOBUF_ACTIVE: | |
7a7d9a89 MCC |
273 | b->flags |= V4L2_BUF_FLAG_QUEUED; |
274 | break; | |
0fc0686e BP |
275 | case VIDEOBUF_DONE: |
276 | case VIDEOBUF_ERROR: | |
7a7d9a89 MCC |
277 | b->flags |= V4L2_BUF_FLAG_DONE; |
278 | break; | |
0fc0686e BP |
279 | case VIDEOBUF_NEEDS_INIT: |
280 | case VIDEOBUF_IDLE: | |
7a7d9a89 MCC |
281 | /* nothing */ |
282 | break; | |
283 | } | |
284 | ||
285 | if (vb->input != UNSET) { | |
286 | b->flags |= V4L2_BUF_FLAG_INPUT; | |
287 | b->input = vb->input; | |
288 | } | |
289 | ||
290 | b->field = vb->field; | |
291 | b->timestamp = vb->ts; | |
292 | b->bytesused = vb->size; | |
293 | b->sequence = vb->field_count >> 1; | |
294 | } | |
295 | ||
64f9477f | 296 | /* Locking: Caller holds q->vb_lock */ |
19bc5133 BP |
297 | static int __videobuf_mmap_free(struct videobuf_queue *q) |
298 | { | |
299 | int i; | |
300 | int rc; | |
301 | ||
302 | if (!q) | |
303 | return 0; | |
304 | ||
e2c77314 | 305 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
19bc5133 | 306 | |
d05051c8 | 307 | |
e2c77314 | 308 | rc = CALL(q, mmap_free, q); |
d05051c8 MCC |
309 | |
310 | q->is_mmapped = 0; | |
311 | ||
e2c77314 | 312 | if (rc < 0) |
19bc5133 BP |
313 | return rc; |
314 | ||
315 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
316 | if (NULL == q->bufs[i]) | |
317 | continue; | |
e2c77314 | 318 | q->ops->buf_release(q, q->bufs[i]); |
19bc5133 BP |
319 | kfree(q->bufs[i]); |
320 | q->bufs[i] = NULL; | |
321 | } | |
322 | ||
323 | return rc; | |
324 | } | |
325 | ||
326 | int videobuf_mmap_free(struct videobuf_queue *q) | |
327 | { | |
328 | int ret; | |
64f9477f | 329 | mutex_lock(&q->vb_lock); |
19bc5133 | 330 | ret = __videobuf_mmap_free(q); |
64f9477f | 331 | mutex_unlock(&q->vb_lock); |
19bc5133 BP |
332 | return ret; |
333 | } | |
334 | ||
64f9477f | 335 | /* Locking: Caller holds q->vb_lock */ |
81b2dbca | 336 | int __videobuf_mmap_setup(struct videobuf_queue *q, |
19bc5133 BP |
337 | unsigned int bcount, unsigned int bsize, |
338 | enum v4l2_memory memory) | |
339 | { | |
340 | unsigned int i; | |
341 | int err; | |
342 | ||
e2c77314 | 343 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
19bc5133 BP |
344 | |
345 | err = __videobuf_mmap_free(q); | |
346 | if (0 != err) | |
347 | return err; | |
348 | ||
349 | /* Allocate and initialize buffers */ | |
350 | for (i = 0; i < bcount; i++) { | |
351 | q->bufs[i] = videobuf_alloc(q); | |
352 | ||
353 | if (q->bufs[i] == NULL) | |
354 | break; | |
355 | ||
356 | q->bufs[i]->i = i; | |
357 | q->bufs[i]->input = UNSET; | |
358 | q->bufs[i]->memory = memory; | |
359 | q->bufs[i]->bsize = bsize; | |
360 | switch (memory) { | |
361 | case V4L2_MEMORY_MMAP: | |
362 | q->bufs[i]->boff = bsize * i; | |
363 | break; | |
364 | case V4L2_MEMORY_USERPTR: | |
365 | case V4L2_MEMORY_OVERLAY: | |
366 | /* nothing */ | |
367 | break; | |
368 | } | |
369 | } | |
370 | ||
371 | if (!i) | |
372 | return -ENOMEM; | |
373 | ||
e2c77314 | 374 | dprintk(1, "mmap setup: %d buffers, %d bytes each\n", |
19bc5133 BP |
375 | i, bsize); |
376 | ||
377 | return i; | |
378 | } | |
379 | ||
380 | int videobuf_mmap_setup(struct videobuf_queue *q, | |
381 | unsigned int bcount, unsigned int bsize, | |
382 | enum v4l2_memory memory) | |
383 | { | |
384 | int ret; | |
64f9477f | 385 | mutex_lock(&q->vb_lock); |
19bc5133 | 386 | ret = __videobuf_mmap_setup(q, bcount, bsize, memory); |
64f9477f | 387 | mutex_unlock(&q->vb_lock); |
19bc5133 BP |
388 | return ret; |
389 | } | |
390 | ||
7a7d9a89 MCC |
391 | int videobuf_reqbufs(struct videobuf_queue *q, |
392 | struct v4l2_requestbuffers *req) | |
393 | { | |
e2c77314 | 394 | unsigned int size, count; |
7a7d9a89 MCC |
395 | int retval; |
396 | ||
7a7d9a89 | 397 | if (req->count < 1) { |
e2c77314 | 398 | dprintk(1, "reqbufs: count invalid (%d)\n", req->count); |
7a7d9a89 MCC |
399 | return -EINVAL; |
400 | } | |
19bc5133 | 401 | |
7a7d9a89 MCC |
402 | if (req->memory != V4L2_MEMORY_MMAP && |
403 | req->memory != V4L2_MEMORY_USERPTR && | |
404 | req->memory != V4L2_MEMORY_OVERLAY) { | |
e2c77314 | 405 | dprintk(1, "reqbufs: memory type invalid\n"); |
7a7d9a89 MCC |
406 | return -EINVAL; |
407 | } | |
408 | ||
64f9477f | 409 | mutex_lock(&q->vb_lock); |
19bc5133 | 410 | if (req->type != q->type) { |
e2c77314 | 411 | dprintk(1, "reqbufs: queue type invalid\n"); |
19bc5133 BP |
412 | retval = -EINVAL; |
413 | goto done; | |
414 | } | |
415 | ||
7a7d9a89 | 416 | if (q->streaming) { |
e2c77314 | 417 | dprintk(1, "reqbufs: streaming already exists\n"); |
00f98d08 BP |
418 | retval = -EBUSY; |
419 | goto done; | |
7a7d9a89 MCC |
420 | } |
421 | if (!list_empty(&q->stream)) { | |
e2c77314 | 422 | dprintk(1, "reqbufs: stream running\n"); |
00f98d08 BP |
423 | retval = -EBUSY; |
424 | goto done; | |
7a7d9a89 MCC |
425 | } |
426 | ||
7a7d9a89 MCC |
427 | count = req->count; |
428 | if (count > VIDEO_MAX_FRAME) | |
429 | count = VIDEO_MAX_FRAME; | |
430 | size = 0; | |
e2c77314 | 431 | q->ops->buf_setup(q, &count, &size); |
7a7d9a89 | 432 | size = PAGE_ALIGN(size); |
e2c77314 | 433 | dprintk(1, "reqbufs: bufs=%d, size=0x%x [%d pages total]\n", |
7a7d9a89 MCC |
434 | count, size, (count*size)>>PAGE_SHIFT); |
435 | ||
e2c77314 | 436 | retval = __videobuf_mmap_setup(q, count, size, req->memory); |
7a7d9a89 | 437 | if (retval < 0) { |
e2c77314 | 438 | dprintk(1, "reqbufs: mmap setup returned %d\n", retval); |
7a7d9a89 MCC |
439 | goto done; |
440 | } | |
441 | ||
49ee718e | 442 | req->count = retval; |
925d74ae | 443 | retval = 0; |
7a7d9a89 MCC |
444 | |
445 | done: | |
64f9477f | 446 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
447 | return retval; |
448 | } | |
449 | ||
450 | int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b) | |
451 | { | |
19bc5133 BP |
452 | int ret = -EINVAL; |
453 | ||
64f9477f | 454 | mutex_lock(&q->vb_lock); |
7a7d9a89 | 455 | if (unlikely(b->type != q->type)) { |
e2c77314 | 456 | dprintk(1, "querybuf: Wrong type.\n"); |
19bc5133 | 457 | goto done; |
7a7d9a89 | 458 | } |
223ffe5f | 459 | if (unlikely(b->index >= VIDEO_MAX_FRAME)) { |
e2c77314 | 460 | dprintk(1, "querybuf: index out of range.\n"); |
19bc5133 | 461 | goto done; |
7a7d9a89 MCC |
462 | } |
463 | if (unlikely(NULL == q->bufs[b->index])) { | |
e2c77314 | 464 | dprintk(1, "querybuf: buffer is null.\n"); |
19bc5133 | 465 | goto done; |
7a7d9a89 | 466 | } |
19bc5133 | 467 | |
e2c77314 | 468 | videobuf_status(q, b, q->bufs[b->index], q->type); |
19bc5133 BP |
469 | |
470 | ret = 0; | |
471 | done: | |
64f9477f | 472 | mutex_unlock(&q->vb_lock); |
19bc5133 | 473 | return ret; |
7a7d9a89 MCC |
474 | } |
475 | ||
476 | int videobuf_qbuf(struct videobuf_queue *q, | |
477 | struct v4l2_buffer *b) | |
478 | { | |
479 | struct videobuf_buffer *buf; | |
480 | enum v4l2_field field; | |
e2c77314 | 481 | unsigned long flags = 0; |
7a7d9a89 MCC |
482 | int retval; |
483 | ||
e2c77314 | 484 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 485 | |
9900132f ML |
486 | if (b->memory == V4L2_MEMORY_MMAP) |
487 | down_read(¤t->mm->mmap_sem); | |
488 | ||
64f9477f | 489 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
490 | retval = -EBUSY; |
491 | if (q->reading) { | |
e2c77314 | 492 | dprintk(1, "qbuf: Reading running...\n"); |
7a7d9a89 MCC |
493 | goto done; |
494 | } | |
495 | retval = -EINVAL; | |
496 | if (b->type != q->type) { | |
e2c77314 | 497 | dprintk(1, "qbuf: Wrong type.\n"); |
7a7d9a89 MCC |
498 | goto done; |
499 | } | |
223ffe5f | 500 | if (b->index >= VIDEO_MAX_FRAME) { |
e2c77314 | 501 | dprintk(1, "qbuf: index out of range.\n"); |
7a7d9a89 MCC |
502 | goto done; |
503 | } | |
504 | buf = q->bufs[b->index]; | |
505 | if (NULL == buf) { | |
e2c77314 | 506 | dprintk(1, "qbuf: buffer is null.\n"); |
7a7d9a89 MCC |
507 | goto done; |
508 | } | |
e2c77314 | 509 | MAGIC_CHECK(buf->magic, MAGIC_BUFFER); |
7a7d9a89 | 510 | if (buf->memory != b->memory) { |
e2c77314 | 511 | dprintk(1, "qbuf: memory type is wrong.\n"); |
7a7d9a89 MCC |
512 | goto done; |
513 | } | |
0fc0686e | 514 | if (buf->state != VIDEOBUF_NEEDS_INIT && buf->state != VIDEOBUF_IDLE) { |
e2c77314 | 515 | dprintk(1, "qbuf: buffer is already queued or active.\n"); |
7a7d9a89 MCC |
516 | goto done; |
517 | } | |
518 | ||
519 | if (b->flags & V4L2_BUF_FLAG_INPUT) { | |
520 | if (b->input >= q->inputs) { | |
e2c77314 | 521 | dprintk(1, "qbuf: wrong input.\n"); |
7a7d9a89 MCC |
522 | goto done; |
523 | } | |
524 | buf->input = b->input; | |
525 | } else { | |
526 | buf->input = UNSET; | |
527 | } | |
528 | ||
529 | switch (b->memory) { | |
530 | case V4L2_MEMORY_MMAP: | |
531 | if (0 == buf->baddr) { | |
e2c77314 MCC |
532 | dprintk(1, "qbuf: mmap requested " |
533 | "but buffer addr is zero!\n"); | |
7a7d9a89 MCC |
534 | goto done; |
535 | } | |
536 | break; | |
537 | case V4L2_MEMORY_USERPTR: | |
538 | if (b->length < buf->bsize) { | |
e2c77314 | 539 | dprintk(1, "qbuf: buffer length is not enough\n"); |
7a7d9a89 MCC |
540 | goto done; |
541 | } | |
e2c77314 MCC |
542 | if (VIDEOBUF_NEEDS_INIT != buf->state && |
543 | buf->baddr != b->m.userptr) | |
544 | q->ops->buf_release(q, buf); | |
7a7d9a89 MCC |
545 | buf->baddr = b->m.userptr; |
546 | break; | |
547 | case V4L2_MEMORY_OVERLAY: | |
548 | buf->boff = b->m.offset; | |
549 | break; | |
550 | default: | |
e2c77314 | 551 | dprintk(1, "qbuf: wrong memory type\n"); |
7a7d9a89 MCC |
552 | goto done; |
553 | } | |
554 | ||
e2c77314 | 555 | dprintk(1, "qbuf: requesting next field\n"); |
7a7d9a89 | 556 | field = videobuf_next_field(q); |
e2c77314 | 557 | retval = q->ops->buf_prepare(q, buf, field); |
7a7d9a89 | 558 | if (0 != retval) { |
e2c77314 | 559 | dprintk(1, "qbuf: buffer_prepare returned %d\n", retval); |
7a7d9a89 MCC |
560 | goto done; |
561 | } | |
562 | ||
e2c77314 | 563 | list_add_tail(&buf->stream, &q->stream); |
7a7d9a89 | 564 | if (q->streaming) { |
0cf4daee | 565 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 566 | q->ops->buf_queue(q, buf); |
0cf4daee | 567 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 | 568 | } |
e2c77314 | 569 | dprintk(1, "qbuf: succeded\n"); |
7a7d9a89 | 570 | retval = 0; |
137d1cb1 | 571 | wake_up_interruptible_sync(&q->wait); |
7a7d9a89 MCC |
572 | |
573 | done: | |
64f9477f | 574 | mutex_unlock(&q->vb_lock); |
9900132f ML |
575 | |
576 | if (b->memory == V4L2_MEMORY_MMAP) | |
577 | up_read(¤t->mm->mmap_sem); | |
578 | ||
7a7d9a89 MCC |
579 | return retval; |
580 | } | |
581 | ||
137d1cb1 BP |
582 | |
583 | /* Locking: Caller holds q->vb_lock */ | |
584 | static int stream_next_buffer_check_queue(struct videobuf_queue *q, int noblock) | |
7a7d9a89 | 585 | { |
7a7d9a89 MCC |
586 | int retval; |
587 | ||
137d1cb1 BP |
588 | checks: |
589 | if (!q->streaming) { | |
590 | dprintk(1, "next_buffer: Not streaming\n"); | |
591 | retval = -EINVAL; | |
7a7d9a89 MCC |
592 | goto done; |
593 | } | |
137d1cb1 | 594 | |
7a7d9a89 | 595 | if (list_empty(&q->stream)) { |
137d1cb1 BP |
596 | if (noblock) { |
597 | retval = -EAGAIN; | |
598 | dprintk(2, "next_buffer: no buffers to dequeue\n"); | |
599 | goto done; | |
600 | } else { | |
601 | dprintk(2, "next_buffer: waiting on buffer\n"); | |
602 | ||
603 | /* Drop lock to avoid deadlock with qbuf */ | |
604 | mutex_unlock(&q->vb_lock); | |
605 | ||
606 | /* Checking list_empty and streaming is safe without | |
607 | * locks because we goto checks to validate while | |
608 | * holding locks before proceeding */ | |
609 | retval = wait_event_interruptible(q->wait, | |
610 | !list_empty(&q->stream) || !q->streaming); | |
611 | mutex_lock(&q->vb_lock); | |
612 | ||
613 | if (retval) | |
614 | goto done; | |
615 | ||
616 | goto checks; | |
617 | } | |
7a7d9a89 | 618 | } |
137d1cb1 BP |
619 | |
620 | retval = 0; | |
621 | ||
622 | done: | |
623 | return retval; | |
624 | } | |
625 | ||
626 | ||
627 | /* Locking: Caller holds q->vb_lock */ | |
628 | static int stream_next_buffer(struct videobuf_queue *q, | |
629 | struct videobuf_buffer **vb, int nonblocking) | |
630 | { | |
631 | int retval; | |
632 | struct videobuf_buffer *buf = NULL; | |
633 | ||
634 | retval = stream_next_buffer_check_queue(q, nonblocking); | |
635 | if (retval) | |
636 | goto done; | |
637 | ||
7a7d9a89 MCC |
638 | buf = list_entry(q->stream.next, struct videobuf_buffer, stream); |
639 | retval = videobuf_waiton(buf, nonblocking, 1); | |
137d1cb1 BP |
640 | if (retval < 0) |
641 | goto done; | |
642 | ||
643 | *vb = buf; | |
644 | done: | |
645 | return retval; | |
646 | } | |
647 | ||
648 | int videobuf_dqbuf(struct videobuf_queue *q, | |
649 | struct v4l2_buffer *b, int nonblocking) | |
650 | { | |
651 | struct videobuf_buffer *buf = NULL; | |
652 | int retval; | |
653 | ||
654 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
655 | ||
e43d76b4 | 656 | mutex_lock(&q->vb_lock); |
137d1cb1 BP |
657 | |
658 | retval = stream_next_buffer(q, &buf, nonblocking); | |
7a7d9a89 | 659 | if (retval < 0) { |
137d1cb1 | 660 | dprintk(1, "dqbuf: next_buffer error: %i\n", retval); |
7a7d9a89 MCC |
661 | goto done; |
662 | } | |
137d1cb1 | 663 | |
7a7d9a89 | 664 | switch (buf->state) { |
0fc0686e | 665 | case VIDEOBUF_ERROR: |
e2c77314 | 666 | dprintk(1, "dqbuf: state is error\n"); |
7a7d9a89 | 667 | retval = -EIO; |
e2c77314 | 668 | CALL(q, sync, q, buf); |
0fc0686e | 669 | buf->state = VIDEOBUF_IDLE; |
7a7d9a89 | 670 | break; |
0fc0686e | 671 | case VIDEOBUF_DONE: |
e2c77314 MCC |
672 | dprintk(1, "dqbuf: state is done\n"); |
673 | CALL(q, sync, q, buf); | |
0fc0686e | 674 | buf->state = VIDEOBUF_IDLE; |
7a7d9a89 MCC |
675 | break; |
676 | default: | |
e2c77314 | 677 | dprintk(1, "dqbuf: state invalid\n"); |
7a7d9a89 MCC |
678 | retval = -EINVAL; |
679 | goto done; | |
680 | } | |
681 | list_del(&buf->stream); | |
e2c77314 MCC |
682 | memset(b, 0, sizeof(*b)); |
683 | videobuf_status(q, b, buf, q->type); | |
7a7d9a89 MCC |
684 | |
685 | done: | |
64f9477f | 686 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
687 | return retval; |
688 | } | |
689 | ||
690 | int videobuf_streamon(struct videobuf_queue *q) | |
691 | { | |
692 | struct videobuf_buffer *buf; | |
e2c77314 | 693 | unsigned long flags = 0; |
7a7d9a89 MCC |
694 | int retval; |
695 | ||
64f9477f | 696 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
697 | retval = -EBUSY; |
698 | if (q->reading) | |
699 | goto done; | |
700 | retval = 0; | |
701 | if (q->streaming) | |
702 | goto done; | |
703 | q->streaming = 1; | |
0cf4daee | 704 | spin_lock_irqsave(q->irqlock, flags); |
a991f44b | 705 | list_for_each_entry(buf, &q->stream, stream) |
0fc0686e | 706 | if (buf->state == VIDEOBUF_PREPARED) |
e2c77314 | 707 | q->ops->buf_queue(q, buf); |
0cf4daee | 708 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 | 709 | |
137d1cb1 | 710 | wake_up_interruptible_sync(&q->wait); |
7a7d9a89 | 711 | done: |
64f9477f | 712 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
713 | return retval; |
714 | } | |
715 | ||
64f9477f | 716 | /* Locking: Caller holds q->vb_lock */ |
19bc5133 | 717 | static int __videobuf_streamoff(struct videobuf_queue *q) |
7a7d9a89 | 718 | { |
7a7d9a89 | 719 | if (!q->streaming) |
19bc5133 BP |
720 | return -EINVAL; |
721 | ||
7a7d9a89 | 722 | videobuf_queue_cancel(q); |
7a7d9a89 | 723 | |
19bc5133 BP |
724 | return 0; |
725 | } | |
726 | ||
727 | int videobuf_streamoff(struct videobuf_queue *q) | |
728 | { | |
729 | int retval; | |
730 | ||
64f9477f | 731 | mutex_lock(&q->vb_lock); |
19bc5133 | 732 | retval = __videobuf_streamoff(q); |
64f9477f | 733 | mutex_unlock(&q->vb_lock); |
19bc5133 | 734 | |
7a7d9a89 MCC |
735 | return retval; |
736 | } | |
737 | ||
64f9477f | 738 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
739 | static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q, |
740 | char __user *data, | |
741 | size_t count, loff_t *ppos) | |
742 | { | |
743 | enum v4l2_field field; | |
e2c77314 | 744 | unsigned long flags = 0; |
7a7d9a89 MCC |
745 | int retval; |
746 | ||
e2c77314 | 747 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 MCC |
748 | |
749 | /* setup stuff */ | |
750 | q->read_buf = videobuf_alloc(q); | |
751 | if (NULL == q->read_buf) | |
752 | return -ENOMEM; | |
753 | ||
754 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
755 | q->read_buf->baddr = (unsigned long)data; | |
756 | q->read_buf->bsize = count; | |
757 | ||
758 | field = videobuf_next_field(q); | |
e2c77314 | 759 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
7a7d9a89 MCC |
760 | if (0 != retval) |
761 | goto done; | |
762 | ||
763 | /* start capture & wait */ | |
0cf4daee | 764 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 765 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee | 766 | spin_unlock_irqrestore(q->irqlock, flags); |
e2c77314 | 767 | retval = videobuf_waiton(q->read_buf, 0, 0); |
7a7d9a89 | 768 | if (0 == retval) { |
e2c77314 | 769 | CALL(q, sync, q, q->read_buf); |
0fc0686e | 770 | if (VIDEOBUF_ERROR == q->read_buf->state) |
7a7d9a89 MCC |
771 | retval = -EIO; |
772 | else | |
773 | retval = q->read_buf->size; | |
774 | } | |
775 | ||
776 | done: | |
777 | /* cleanup */ | |
e2c77314 | 778 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
779 | kfree(q->read_buf); |
780 | q->read_buf = NULL; | |
781 | return retval; | |
782 | } | |
783 | ||
784 | ssize_t videobuf_read_one(struct videobuf_queue *q, | |
785 | char __user *data, size_t count, loff_t *ppos, | |
786 | int nonblocking) | |
787 | { | |
788 | enum v4l2_field field; | |
e2c77314 | 789 | unsigned long flags = 0; |
7daa4a88 | 790 | unsigned size = 0, nbufs = 1; |
7a7d9a89 MCC |
791 | int retval; |
792 | ||
e2c77314 | 793 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 794 | |
64f9477f | 795 | mutex_lock(&q->vb_lock); |
7a7d9a89 | 796 | |
e2c77314 | 797 | q->ops->buf_setup(q, &nbufs, &size); |
7a7d9a89 MCC |
798 | |
799 | if (NULL == q->read_buf && | |
800 | count >= size && | |
801 | !nonblocking) { | |
e2c77314 | 802 | retval = videobuf_read_zerocopy(q, data, count, ppos); |
7a7d9a89 MCC |
803 | if (retval >= 0 || retval == -EIO) |
804 | /* ok, all done */ | |
805 | goto done; | |
806 | /* fallback to kernel bounce buffer on failures */ | |
807 | } | |
808 | ||
809 | if (NULL == q->read_buf) { | |
810 | /* need to capture a new frame */ | |
811 | retval = -ENOMEM; | |
812 | q->read_buf = videobuf_alloc(q); | |
813 | ||
e2c77314 | 814 | dprintk(1, "video alloc=0x%p\n", q->read_buf); |
7a7d9a89 MCC |
815 | if (NULL == q->read_buf) |
816 | goto done; | |
817 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
818 | q->read_buf->bsize = count; /* preferred size */ | |
819 | field = videobuf_next_field(q); | |
e2c77314 | 820 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
7a7d9a89 MCC |
821 | |
822 | if (0 != retval) { | |
e2c77314 | 823 | kfree(q->read_buf); |
7a7d9a89 MCC |
824 | q->read_buf = NULL; |
825 | goto done; | |
826 | } | |
7a7d9a89 | 827 | |
0cf4daee | 828 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 829 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee BP |
830 | spin_unlock_irqrestore(q->irqlock, flags); |
831 | ||
7a7d9a89 MCC |
832 | q->read_off = 0; |
833 | } | |
834 | ||
835 | /* wait until capture is done */ | |
836 | retval = videobuf_waiton(q->read_buf, nonblocking, 1); | |
837 | if (0 != retval) | |
838 | goto done; | |
839 | ||
e2c77314 | 840 | CALL(q, sync, q, q->read_buf); |
7a7d9a89 | 841 | |
0fc0686e | 842 | if (VIDEOBUF_ERROR == q->read_buf->state) { |
7a7d9a89 | 843 | /* catch I/O errors */ |
e2c77314 | 844 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
845 | kfree(q->read_buf); |
846 | q->read_buf = NULL; | |
847 | retval = -EIO; | |
848 | goto done; | |
849 | } | |
850 | ||
851 | /* Copy to userspace */ | |
e2c77314 MCC |
852 | retval = CALL(q, video_copy_to_user, q, data, count, nonblocking); |
853 | if (retval < 0) | |
7a7d9a89 MCC |
854 | goto done; |
855 | ||
856 | q->read_off += retval; | |
857 | if (q->read_off == q->read_buf->size) { | |
858 | /* all data copied, cleanup */ | |
e2c77314 | 859 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
860 | kfree(q->read_buf); |
861 | q->read_buf = NULL; | |
862 | } | |
863 | ||
864 | done: | |
64f9477f | 865 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
866 | return retval; |
867 | } | |
868 | ||
64f9477f | 869 | /* Locking: Caller holds q->vb_lock */ |
225ba900 | 870 | static int __videobuf_read_start(struct videobuf_queue *q) |
7a7d9a89 MCC |
871 | { |
872 | enum v4l2_field field; | |
e2c77314 | 873 | unsigned long flags = 0; |
49ee718e | 874 | unsigned int count = 0, size = 0; |
7a7d9a89 MCC |
875 | int err, i; |
876 | ||
e2c77314 | 877 | q->ops->buf_setup(q, &count, &size); |
7a7d9a89 MCC |
878 | if (count < 2) |
879 | count = 2; | |
880 | if (count > VIDEO_MAX_FRAME) | |
881 | count = VIDEO_MAX_FRAME; | |
882 | size = PAGE_ALIGN(size); | |
883 | ||
19bc5133 | 884 | err = __videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR); |
49ee718e | 885 | if (err < 0) |
7a7d9a89 MCC |
886 | return err; |
887 | ||
49ee718e BP |
888 | count = err; |
889 | ||
7a7d9a89 MCC |
890 | for (i = 0; i < count; i++) { |
891 | field = videobuf_next_field(q); | |
e2c77314 | 892 | err = q->ops->buf_prepare(q, q->bufs[i], field); |
7a7d9a89 MCC |
893 | if (err) |
894 | return err; | |
895 | list_add_tail(&q->bufs[i]->stream, &q->stream); | |
896 | } | |
0cf4daee | 897 | spin_lock_irqsave(q->irqlock, flags); |
7a7d9a89 | 898 | for (i = 0; i < count; i++) |
e2c77314 | 899 | q->ops->buf_queue(q, q->bufs[i]); |
0cf4daee | 900 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
901 | q->reading = 1; |
902 | return 0; | |
903 | } | |
904 | ||
19bc5133 | 905 | static void __videobuf_read_stop(struct videobuf_queue *q) |
7a7d9a89 MCC |
906 | { |
907 | int i; | |
908 | ||
909 | videobuf_queue_cancel(q); | |
19bc5133 | 910 | __videobuf_mmap_free(q); |
7a7d9a89 MCC |
911 | INIT_LIST_HEAD(&q->stream); |
912 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
913 | if (NULL == q->bufs[i]) | |
914 | continue; | |
915 | kfree(q->bufs[i]); | |
916 | q->bufs[i] = NULL; | |
917 | } | |
918 | q->read_buf = NULL; | |
e2c77314 | 919 | |
19bc5133 BP |
920 | } |
921 | ||
19fb1457 MCC |
922 | int videobuf_read_start(struct videobuf_queue *q) |
923 | { | |
924 | int rc; | |
925 | ||
64f9477f | 926 | mutex_lock(&q->vb_lock); |
19fb1457 | 927 | rc = __videobuf_read_start(q); |
64f9477f | 928 | mutex_unlock(&q->vb_lock); |
19fb1457 MCC |
929 | |
930 | return rc; | |
931 | } | |
932 | ||
19bc5133 BP |
933 | void videobuf_read_stop(struct videobuf_queue *q) |
934 | { | |
64f9477f | 935 | mutex_lock(&q->vb_lock); |
19bc5133 | 936 | __videobuf_read_stop(q); |
64f9477f | 937 | mutex_unlock(&q->vb_lock); |
19bc5133 BP |
938 | } |
939 | ||
940 | void videobuf_stop(struct videobuf_queue *q) | |
941 | { | |
64f9477f | 942 | mutex_lock(&q->vb_lock); |
19bc5133 BP |
943 | |
944 | if (q->streaming) | |
945 | __videobuf_streamoff(q); | |
946 | ||
947 | if (q->reading) | |
948 | __videobuf_read_stop(q); | |
949 | ||
64f9477f | 950 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
951 | } |
952 | ||
19bc5133 | 953 | |
7a7d9a89 MCC |
954 | ssize_t videobuf_read_stream(struct videobuf_queue *q, |
955 | char __user *data, size_t count, loff_t *ppos, | |
956 | int vbihack, int nonblocking) | |
957 | { | |
958 | int rc, retval; | |
e2c77314 | 959 | unsigned long flags = 0; |
7a7d9a89 | 960 | |
e2c77314 | 961 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 962 | |
7e28adb2 | 963 | dprintk(2, "%s\n", __func__); |
64f9477f | 964 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
965 | retval = -EBUSY; |
966 | if (q->streaming) | |
967 | goto done; | |
968 | if (!q->reading) { | |
3f84307a | 969 | retval = __videobuf_read_start(q); |
7a7d9a89 MCC |
970 | if (retval < 0) |
971 | goto done; | |
972 | } | |
973 | ||
974 | retval = 0; | |
975 | while (count > 0) { | |
976 | /* get / wait for data */ | |
977 | if (NULL == q->read_buf) { | |
978 | q->read_buf = list_entry(q->stream.next, | |
979 | struct videobuf_buffer, | |
980 | stream); | |
981 | list_del(&q->read_buf->stream); | |
982 | q->read_off = 0; | |
983 | } | |
984 | rc = videobuf_waiton(q->read_buf, nonblocking, 1); | |
985 | if (rc < 0) { | |
986 | if (0 == retval) | |
987 | retval = rc; | |
988 | break; | |
989 | } | |
990 | ||
0fc0686e | 991 | if (q->read_buf->state == VIDEOBUF_DONE) { |
e2c77314 | 992 | rc = CALL(q, copy_stream, q, data + retval, count, |
7a7d9a89 MCC |
993 | retval, vbihack, nonblocking); |
994 | if (rc < 0) { | |
995 | retval = rc; | |
996 | break; | |
997 | } | |
998 | retval += rc; | |
999 | count -= rc; | |
1000 | q->read_off += rc; | |
1001 | } else { | |
1002 | /* some error */ | |
1003 | q->read_off = q->read_buf->size; | |
1004 | if (0 == retval) | |
1005 | retval = -EIO; | |
1006 | } | |
1007 | ||
1008 | /* requeue buffer when done with copying */ | |
1009 | if (q->read_off == q->read_buf->size) { | |
1010 | list_add_tail(&q->read_buf->stream, | |
1011 | &q->stream); | |
0cf4daee | 1012 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 1013 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee | 1014 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
1015 | q->read_buf = NULL; |
1016 | } | |
1017 | if (retval < 0) | |
1018 | break; | |
1019 | } | |
1020 | ||
1021 | done: | |
64f9477f | 1022 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
1023 | return retval; |
1024 | } | |
1025 | ||
1026 | unsigned int videobuf_poll_stream(struct file *file, | |
1027 | struct videobuf_queue *q, | |
1028 | poll_table *wait) | |
1029 | { | |
1030 | struct videobuf_buffer *buf = NULL; | |
1031 | unsigned int rc = 0; | |
1032 | ||
64f9477f | 1033 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
1034 | if (q->streaming) { |
1035 | if (!list_empty(&q->stream)) | |
1036 | buf = list_entry(q->stream.next, | |
1037 | struct videobuf_buffer, stream); | |
1038 | } else { | |
1039 | if (!q->reading) | |
3f84307a | 1040 | __videobuf_read_start(q); |
7a7d9a89 MCC |
1041 | if (!q->reading) { |
1042 | rc = POLLERR; | |
1043 | } else if (NULL == q->read_buf) { | |
1044 | q->read_buf = list_entry(q->stream.next, | |
1045 | struct videobuf_buffer, | |
1046 | stream); | |
1047 | list_del(&q->read_buf->stream); | |
1048 | q->read_off = 0; | |
1049 | } | |
1050 | buf = q->read_buf; | |
1051 | } | |
1052 | if (!buf) | |
1053 | rc = POLLERR; | |
1054 | ||
1055 | if (0 == rc) { | |
1056 | poll_wait(file, &buf->done, wait); | |
0fc0686e BP |
1057 | if (buf->state == VIDEOBUF_DONE || |
1058 | buf->state == VIDEOBUF_ERROR) | |
7a7d9a89 MCC |
1059 | rc = POLLIN|POLLRDNORM; |
1060 | } | |
64f9477f | 1061 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
1062 | return rc; |
1063 | } | |
1064 | ||
7a7d9a89 MCC |
1065 | int videobuf_mmap_mapper(struct videobuf_queue *q, |
1066 | struct vm_area_struct *vma) | |
1067 | { | |
1068 | int retval; | |
1069 | ||
e2c77314 | 1070 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1071 | |
64f9477f | 1072 | mutex_lock(&q->vb_lock); |
e2c77314 | 1073 | retval = CALL(q, mmap_mapper, q, vma); |
d05051c8 | 1074 | q->is_mmapped = 1; |
64f9477f | 1075 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
1076 | |
1077 | return retval; | |
1078 | } | |
1079 | ||
1080 | #ifdef CONFIG_VIDEO_V4L1_COMPAT | |
1081 | int videobuf_cgmbuf(struct videobuf_queue *q, | |
1082 | struct video_mbuf *mbuf, int count) | |
1083 | { | |
1084 | struct v4l2_requestbuffers req; | |
e2c77314 | 1085 | int rc, i; |
7a7d9a89 | 1086 | |
e2c77314 | 1087 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1088 | |
e2c77314 | 1089 | memset(&req, 0, sizeof(req)); |
7a7d9a89 MCC |
1090 | req.type = q->type; |
1091 | req.count = count; | |
1092 | req.memory = V4L2_MEMORY_MMAP; | |
e2c77314 | 1093 | rc = videobuf_reqbufs(q, &req); |
7a7d9a89 MCC |
1094 | if (rc < 0) |
1095 | return rc; | |
1096 | ||
1097 | mbuf->frames = req.count; | |
1098 | mbuf->size = 0; | |
1099 | for (i = 0; i < mbuf->frames; i++) { | |
1100 | mbuf->offsets[i] = q->bufs[i]->boff; | |
1101 | mbuf->size += q->bufs[i]->bsize; | |
1102 | } | |
1103 | ||
1104 | return 0; | |
1105 | } | |
a13625c5 | 1106 | EXPORT_SYMBOL_GPL(videobuf_cgmbuf); |
7a7d9a89 MCC |
1107 | #endif |
1108 | ||
1109 | /* --------------------------------------------------------------------- */ | |
1110 | ||
1111 | EXPORT_SYMBOL_GPL(videobuf_waiton); | |
1112 | EXPORT_SYMBOL_GPL(videobuf_iolock); | |
1113 | ||
1114 | EXPORT_SYMBOL_GPL(videobuf_alloc); | |
1115 | ||
d4cae5a5 | 1116 | EXPORT_SYMBOL_GPL(videobuf_queue_core_init); |
7a7d9a89 MCC |
1117 | EXPORT_SYMBOL_GPL(videobuf_queue_cancel); |
1118 | EXPORT_SYMBOL_GPL(videobuf_queue_is_busy); | |
1119 | ||
1120 | EXPORT_SYMBOL_GPL(videobuf_next_field); | |
1121 | EXPORT_SYMBOL_GPL(videobuf_reqbufs); | |
1122 | EXPORT_SYMBOL_GPL(videobuf_querybuf); | |
1123 | EXPORT_SYMBOL_GPL(videobuf_qbuf); | |
1124 | EXPORT_SYMBOL_GPL(videobuf_dqbuf); | |
7a7d9a89 MCC |
1125 | EXPORT_SYMBOL_GPL(videobuf_streamon); |
1126 | EXPORT_SYMBOL_GPL(videobuf_streamoff); | |
1127 | ||
19fb1457 | 1128 | EXPORT_SYMBOL_GPL(videobuf_read_start); |
7a7d9a89 | 1129 | EXPORT_SYMBOL_GPL(videobuf_read_stop); |
19bc5133 | 1130 | EXPORT_SYMBOL_GPL(videobuf_stop); |
7a7d9a89 MCC |
1131 | EXPORT_SYMBOL_GPL(videobuf_read_stream); |
1132 | EXPORT_SYMBOL_GPL(videobuf_read_one); | |
1133 | EXPORT_SYMBOL_GPL(videobuf_poll_stream); | |
1134 | ||
81b2dbca | 1135 | EXPORT_SYMBOL_GPL(__videobuf_mmap_setup); |
7a7d9a89 MCC |
1136 | EXPORT_SYMBOL_GPL(videobuf_mmap_setup); |
1137 | EXPORT_SYMBOL_GPL(videobuf_mmap_free); | |
1138 | EXPORT_SYMBOL_GPL(videobuf_mmap_mapper); |