Commit | Line | Data |
---|---|---|
7a7d9a89 MCC |
1 | /* |
2 | * generic helper functions for handling video4linux capture buffers | |
3 | * | |
4 | * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org> | |
5 | * | |
6 | * Highly based on video-buf written originally by: | |
7 | * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> | |
8 | * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org> | |
9 | * (c) 2006 Ted Walther and John Sokol | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 | |
14 | */ | |
15 | ||
16 | #include <linux/init.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/moduleparam.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/interrupt.h> | |
21 | ||
22 | #include <media/videobuf-core.h> | |
23 | ||
24 | #define MAGIC_BUFFER 0x20070728 | |
e2c77314 MCC |
25 | #define MAGIC_CHECK(is, should) do { \ |
26 | if (unlikely((is) != (should))) { \ | |
27 | printk(KERN_ERR "magic mismatch: %x (expected %x)\n", is, should); \ | |
28 | BUG(); } } while (0) | |
7a7d9a89 | 29 | |
e2c77314 | 30 | static int debug; |
7a7d9a89 MCC |
31 | module_param(debug, int, 0644); |
32 | ||
33 | MODULE_DESCRIPTION("helper module to manage video4linux buffers"); | |
34 | MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>"); | |
35 | MODULE_LICENSE("GPL"); | |
36 | ||
e2c77314 MCC |
37 | #define dprintk(level, fmt, arg...) do { \ |
38 | if (debug >= level) \ | |
39 | printk(KERN_DEBUG "vbuf: " fmt , ## arg); } while (0) | |
7a7d9a89 MCC |
40 | |
41 | /* --------------------------------------------------------------------- */ | |
42 | ||
43 | #define CALL(q, f, arg...) \ | |
e2c77314 | 44 | ((q->int_ops->f) ? q->int_ops->f(arg) : 0) |
7a7d9a89 | 45 | |
e2c77314 | 46 | void *videobuf_alloc(struct videobuf_queue *q) |
7a7d9a89 MCC |
47 | { |
48 | struct videobuf_buffer *vb; | |
49 | ||
e2c77314 | 50 | BUG_ON(q->msize < sizeof(*vb)); |
7a7d9a89 MCC |
51 | |
52 | if (!q->int_ops || !q->int_ops->alloc) { | |
53 | printk(KERN_ERR "No specific ops defined!\n"); | |
54 | BUG(); | |
55 | } | |
56 | ||
57 | vb = q->int_ops->alloc(q->msize); | |
58 | ||
59 | if (NULL != vb) { | |
60 | init_waitqueue_head(&vb->done); | |
61 | vb->magic = MAGIC_BUFFER; | |
62 | } | |
63 | ||
64 | return vb; | |
65 | } | |
66 | ||
009a9059 BP |
67 | #define WAITON_CONDITION (vb->state != VIDEOBUF_ACTIVE &&\ |
68 | vb->state != VIDEOBUF_QUEUED) | |
7a7d9a89 MCC |
69 | int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr) |
70 | { | |
e2c77314 | 71 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
009a9059 BP |
72 | |
73 | if (non_blocking) { | |
74 | if (WAITON_CONDITION) | |
75 | return 0; | |
76 | else | |
77 | return -EAGAIN; | |
7a7d9a89 | 78 | } |
009a9059 BP |
79 | |
80 | if (intr) | |
81 | return wait_event_interruptible(vb->done, WAITON_CONDITION); | |
82 | else | |
83 | wait_event(vb->done, WAITON_CONDITION); | |
84 | ||
85 | return 0; | |
7a7d9a89 MCC |
86 | } |
87 | ||
e2c77314 | 88 | int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb, |
7a7d9a89 MCC |
89 | struct v4l2_framebuffer *fbuf) |
90 | { | |
e2c77314 MCC |
91 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
92 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
7a7d9a89 | 93 | |
e2c77314 | 94 | return CALL(q, iolock, q, vb, fbuf); |
7a7d9a89 MCC |
95 | } |
96 | ||
59d34489 MCC |
97 | void *videobuf_queue_to_vmalloc (struct videobuf_queue *q, |
98 | struct videobuf_buffer *buf) | |
99 | { | |
a6a3a17b HH |
100 | if (q->int_ops->vmalloc) |
101 | return q->int_ops->vmalloc(buf); | |
102 | else | |
103 | return NULL; | |
59d34489 MCC |
104 | } |
105 | EXPORT_SYMBOL_GPL(videobuf_queue_to_vmalloc); | |
106 | ||
7a7d9a89 MCC |
107 | /* --------------------------------------------------------------------- */ |
108 | ||
109 | ||
e2c77314 | 110 | void videobuf_queue_core_init(struct videobuf_queue *q, |
7a7d9a89 | 111 | struct videobuf_queue_ops *ops, |
e9bcf667 | 112 | struct device *dev, |
7a7d9a89 MCC |
113 | spinlock_t *irqlock, |
114 | enum v4l2_buf_type type, | |
115 | enum v4l2_field field, | |
116 | unsigned int msize, | |
d4cae5a5 MCC |
117 | void *priv, |
118 | struct videobuf_qtype_ops *int_ops) | |
7a7d9a89 | 119 | { |
e2c77314 | 120 | memset(q, 0, sizeof(*q)); |
d4cae5a5 MCC |
121 | q->irqlock = irqlock; |
122 | q->dev = dev; | |
123 | q->type = type; | |
124 | q->field = field; | |
125 | q->msize = msize; | |
126 | q->ops = ops; | |
7a7d9a89 | 127 | q->priv_data = priv; |
d4cae5a5 | 128 | q->int_ops = int_ops; |
7a7d9a89 MCC |
129 | |
130 | /* All buffer operations are mandatory */ | |
e2c77314 MCC |
131 | BUG_ON(!q->ops->buf_setup); |
132 | BUG_ON(!q->ops->buf_prepare); | |
133 | BUG_ON(!q->ops->buf_queue); | |
134 | BUG_ON(!q->ops->buf_release); | |
7a7d9a89 | 135 | |
0cf4daee BP |
136 | /* Lock is mandatory for queue_cancel to work */ |
137 | BUG_ON(!irqlock); | |
138 | ||
d4cae5a5 | 139 | /* Having implementations for abstract methods are mandatory */ |
e2c77314 | 140 | BUG_ON(!q->int_ops); |
d4cae5a5 | 141 | |
64f9477f | 142 | mutex_init(&q->vb_lock); |
137d1cb1 | 143 | init_waitqueue_head(&q->wait); |
7a7d9a89 MCC |
144 | INIT_LIST_HEAD(&q->stream); |
145 | } | |
146 | ||
19bc5133 | 147 | /* Locking: Only usage in bttv unsafe find way to remove */ |
7a7d9a89 MCC |
148 | int videobuf_queue_is_busy(struct videobuf_queue *q) |
149 | { | |
150 | int i; | |
151 | ||
e2c77314 | 152 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 MCC |
153 | |
154 | if (q->streaming) { | |
e2c77314 | 155 | dprintk(1, "busy: streaming active\n"); |
7a7d9a89 MCC |
156 | return 1; |
157 | } | |
158 | if (q->reading) { | |
e2c77314 | 159 | dprintk(1, "busy: pending read #1\n"); |
7a7d9a89 MCC |
160 | return 1; |
161 | } | |
162 | if (q->read_buf) { | |
e2c77314 | 163 | dprintk(1, "busy: pending read #2\n"); |
7a7d9a89 MCC |
164 | return 1; |
165 | } | |
166 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
167 | if (NULL == q->bufs[i]) | |
168 | continue; | |
851c0c96 | 169 | if (q->bufs[i]->map) { |
e2c77314 | 170 | dprintk(1, "busy: buffer #%d mapped\n", i); |
7a7d9a89 MCC |
171 | return 1; |
172 | } | |
0fc0686e | 173 | if (q->bufs[i]->state == VIDEOBUF_QUEUED) { |
e2c77314 | 174 | dprintk(1, "busy: buffer #%d queued\n", i); |
7a7d9a89 MCC |
175 | return 1; |
176 | } | |
0fc0686e | 177 | if (q->bufs[i]->state == VIDEOBUF_ACTIVE) { |
e2c77314 | 178 | dprintk(1, "busy: buffer #%d avtive\n", i); |
7a7d9a89 MCC |
179 | return 1; |
180 | } | |
181 | } | |
182 | return 0; | |
183 | } | |
184 | ||
64f9477f | 185 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
186 | void videobuf_queue_cancel(struct videobuf_queue *q) |
187 | { | |
e2c77314 | 188 | unsigned long flags = 0; |
7a7d9a89 MCC |
189 | int i; |
190 | ||
137d1cb1 BP |
191 | q->streaming = 0; |
192 | q->reading = 0; | |
193 | wake_up_interruptible_sync(&q->wait); | |
194 | ||
7a7d9a89 | 195 | /* remove queued buffers from list */ |
0cf4daee | 196 | spin_lock_irqsave(q->irqlock, flags); |
7a7d9a89 MCC |
197 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
198 | if (NULL == q->bufs[i]) | |
199 | continue; | |
0fc0686e | 200 | if (q->bufs[i]->state == VIDEOBUF_QUEUED) { |
7a7d9a89 | 201 | list_del(&q->bufs[i]->queue); |
0fc0686e | 202 | q->bufs[i]->state = VIDEOBUF_ERROR; |
b608f432 | 203 | wake_up_all(&q->bufs[i]->done); |
7a7d9a89 MCC |
204 | } |
205 | } | |
0cf4daee | 206 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
207 | |
208 | /* free all buffers + clear queue */ | |
209 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
210 | if (NULL == q->bufs[i]) | |
211 | continue; | |
e2c77314 | 212 | q->ops->buf_release(q, q->bufs[i]); |
7a7d9a89 MCC |
213 | } |
214 | INIT_LIST_HEAD(&q->stream); | |
215 | } | |
216 | ||
217 | /* --------------------------------------------------------------------- */ | |
218 | ||
64f9477f | 219 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
220 | enum v4l2_field videobuf_next_field(struct videobuf_queue *q) |
221 | { | |
222 | enum v4l2_field field = q->field; | |
223 | ||
224 | BUG_ON(V4L2_FIELD_ANY == field); | |
225 | ||
226 | if (V4L2_FIELD_ALTERNATE == field) { | |
227 | if (V4L2_FIELD_TOP == q->last) { | |
228 | field = V4L2_FIELD_BOTTOM; | |
229 | q->last = V4L2_FIELD_BOTTOM; | |
230 | } else { | |
231 | field = V4L2_FIELD_TOP; | |
232 | q->last = V4L2_FIELD_TOP; | |
233 | } | |
234 | } | |
235 | return field; | |
236 | } | |
237 | ||
64f9477f | 238 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
239 | static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b, |
240 | struct videobuf_buffer *vb, enum v4l2_buf_type type) | |
241 | { | |
e2c77314 MCC |
242 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
243 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
7a7d9a89 MCC |
244 | |
245 | b->index = vb->i; | |
246 | b->type = type; | |
247 | ||
248 | b->memory = vb->memory; | |
249 | switch (b->memory) { | |
250 | case V4L2_MEMORY_MMAP: | |
251 | b->m.offset = vb->boff; | |
252 | b->length = vb->bsize; | |
253 | break; | |
254 | case V4L2_MEMORY_USERPTR: | |
255 | b->m.userptr = vb->baddr; | |
256 | b->length = vb->bsize; | |
257 | break; | |
258 | case V4L2_MEMORY_OVERLAY: | |
259 | b->m.offset = vb->boff; | |
260 | break; | |
261 | } | |
262 | ||
263 | b->flags = 0; | |
851c0c96 | 264 | if (vb->map) |
7a7d9a89 MCC |
265 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
266 | ||
267 | switch (vb->state) { | |
0fc0686e BP |
268 | case VIDEOBUF_PREPARED: |
269 | case VIDEOBUF_QUEUED: | |
270 | case VIDEOBUF_ACTIVE: | |
7a7d9a89 MCC |
271 | b->flags |= V4L2_BUF_FLAG_QUEUED; |
272 | break; | |
0fc0686e BP |
273 | case VIDEOBUF_DONE: |
274 | case VIDEOBUF_ERROR: | |
7a7d9a89 MCC |
275 | b->flags |= V4L2_BUF_FLAG_DONE; |
276 | break; | |
0fc0686e BP |
277 | case VIDEOBUF_NEEDS_INIT: |
278 | case VIDEOBUF_IDLE: | |
7a7d9a89 MCC |
279 | /* nothing */ |
280 | break; | |
281 | } | |
282 | ||
283 | if (vb->input != UNSET) { | |
284 | b->flags |= V4L2_BUF_FLAG_INPUT; | |
285 | b->input = vb->input; | |
286 | } | |
287 | ||
288 | b->field = vb->field; | |
289 | b->timestamp = vb->ts; | |
290 | b->bytesused = vb->size; | |
291 | b->sequence = vb->field_count >> 1; | |
292 | } | |
293 | ||
64f9477f | 294 | /* Locking: Caller holds q->vb_lock */ |
19bc5133 BP |
295 | static int __videobuf_mmap_free(struct videobuf_queue *q) |
296 | { | |
297 | int i; | |
298 | int rc; | |
299 | ||
300 | if (!q) | |
301 | return 0; | |
302 | ||
e2c77314 | 303 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
19bc5133 | 304 | |
d05051c8 | 305 | |
e2c77314 | 306 | rc = CALL(q, mmap_free, q); |
d05051c8 MCC |
307 | |
308 | q->is_mmapped = 0; | |
309 | ||
e2c77314 | 310 | if (rc < 0) |
19bc5133 BP |
311 | return rc; |
312 | ||
313 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
314 | if (NULL == q->bufs[i]) | |
315 | continue; | |
e2c77314 | 316 | q->ops->buf_release(q, q->bufs[i]); |
19bc5133 BP |
317 | kfree(q->bufs[i]); |
318 | q->bufs[i] = NULL; | |
319 | } | |
320 | ||
321 | return rc; | |
322 | } | |
323 | ||
324 | int videobuf_mmap_free(struct videobuf_queue *q) | |
325 | { | |
326 | int ret; | |
64f9477f | 327 | mutex_lock(&q->vb_lock); |
19bc5133 | 328 | ret = __videobuf_mmap_free(q); |
64f9477f | 329 | mutex_unlock(&q->vb_lock); |
19bc5133 BP |
330 | return ret; |
331 | } | |
332 | ||
64f9477f | 333 | /* Locking: Caller holds q->vb_lock */ |
81b2dbca | 334 | int __videobuf_mmap_setup(struct videobuf_queue *q, |
19bc5133 BP |
335 | unsigned int bcount, unsigned int bsize, |
336 | enum v4l2_memory memory) | |
337 | { | |
338 | unsigned int i; | |
339 | int err; | |
340 | ||
e2c77314 | 341 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
19bc5133 BP |
342 | |
343 | err = __videobuf_mmap_free(q); | |
344 | if (0 != err) | |
345 | return err; | |
346 | ||
347 | /* Allocate and initialize buffers */ | |
348 | for (i = 0; i < bcount; i++) { | |
349 | q->bufs[i] = videobuf_alloc(q); | |
350 | ||
351 | if (q->bufs[i] == NULL) | |
352 | break; | |
353 | ||
354 | q->bufs[i]->i = i; | |
355 | q->bufs[i]->input = UNSET; | |
356 | q->bufs[i]->memory = memory; | |
357 | q->bufs[i]->bsize = bsize; | |
358 | switch (memory) { | |
359 | case V4L2_MEMORY_MMAP: | |
360 | q->bufs[i]->boff = bsize * i; | |
361 | break; | |
362 | case V4L2_MEMORY_USERPTR: | |
363 | case V4L2_MEMORY_OVERLAY: | |
364 | /* nothing */ | |
365 | break; | |
366 | } | |
367 | } | |
368 | ||
369 | if (!i) | |
370 | return -ENOMEM; | |
371 | ||
e2c77314 | 372 | dprintk(1, "mmap setup: %d buffers, %d bytes each\n", |
19bc5133 BP |
373 | i, bsize); |
374 | ||
375 | return i; | |
376 | } | |
377 | ||
378 | int videobuf_mmap_setup(struct videobuf_queue *q, | |
379 | unsigned int bcount, unsigned int bsize, | |
380 | enum v4l2_memory memory) | |
381 | { | |
382 | int ret; | |
64f9477f | 383 | mutex_lock(&q->vb_lock); |
19bc5133 | 384 | ret = __videobuf_mmap_setup(q, bcount, bsize, memory); |
64f9477f | 385 | mutex_unlock(&q->vb_lock); |
19bc5133 BP |
386 | return ret; |
387 | } | |
388 | ||
7a7d9a89 MCC |
389 | int videobuf_reqbufs(struct videobuf_queue *q, |
390 | struct v4l2_requestbuffers *req) | |
391 | { | |
e2c77314 | 392 | unsigned int size, count; |
7a7d9a89 MCC |
393 | int retval; |
394 | ||
7a7d9a89 | 395 | if (req->count < 1) { |
e2c77314 | 396 | dprintk(1, "reqbufs: count invalid (%d)\n", req->count); |
7a7d9a89 MCC |
397 | return -EINVAL; |
398 | } | |
19bc5133 | 399 | |
7a7d9a89 MCC |
400 | if (req->memory != V4L2_MEMORY_MMAP && |
401 | req->memory != V4L2_MEMORY_USERPTR && | |
402 | req->memory != V4L2_MEMORY_OVERLAY) { | |
e2c77314 | 403 | dprintk(1, "reqbufs: memory type invalid\n"); |
7a7d9a89 MCC |
404 | return -EINVAL; |
405 | } | |
406 | ||
64f9477f | 407 | mutex_lock(&q->vb_lock); |
19bc5133 | 408 | if (req->type != q->type) { |
e2c77314 | 409 | dprintk(1, "reqbufs: queue type invalid\n"); |
19bc5133 BP |
410 | retval = -EINVAL; |
411 | goto done; | |
412 | } | |
413 | ||
7a7d9a89 | 414 | if (q->streaming) { |
e2c77314 | 415 | dprintk(1, "reqbufs: streaming already exists\n"); |
00f98d08 BP |
416 | retval = -EBUSY; |
417 | goto done; | |
7a7d9a89 MCC |
418 | } |
419 | if (!list_empty(&q->stream)) { | |
e2c77314 | 420 | dprintk(1, "reqbufs: stream running\n"); |
00f98d08 BP |
421 | retval = -EBUSY; |
422 | goto done; | |
7a7d9a89 MCC |
423 | } |
424 | ||
7a7d9a89 MCC |
425 | count = req->count; |
426 | if (count > VIDEO_MAX_FRAME) | |
427 | count = VIDEO_MAX_FRAME; | |
428 | size = 0; | |
e2c77314 | 429 | q->ops->buf_setup(q, &count, &size); |
7a7d9a89 | 430 | size = PAGE_ALIGN(size); |
e2c77314 | 431 | dprintk(1, "reqbufs: bufs=%d, size=0x%x [%d pages total]\n", |
7a7d9a89 MCC |
432 | count, size, (count*size)>>PAGE_SHIFT); |
433 | ||
e2c77314 | 434 | retval = __videobuf_mmap_setup(q, count, size, req->memory); |
7a7d9a89 | 435 | if (retval < 0) { |
e2c77314 | 436 | dprintk(1, "reqbufs: mmap setup returned %d\n", retval); |
7a7d9a89 MCC |
437 | goto done; |
438 | } | |
439 | ||
49ee718e | 440 | req->count = retval; |
7a7d9a89 MCC |
441 | |
442 | done: | |
64f9477f | 443 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
444 | return retval; |
445 | } | |
446 | ||
447 | int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b) | |
448 | { | |
19bc5133 BP |
449 | int ret = -EINVAL; |
450 | ||
64f9477f | 451 | mutex_lock(&q->vb_lock); |
7a7d9a89 | 452 | if (unlikely(b->type != q->type)) { |
e2c77314 | 453 | dprintk(1, "querybuf: Wrong type.\n"); |
19bc5133 | 454 | goto done; |
7a7d9a89 MCC |
455 | } |
456 | if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) { | |
e2c77314 | 457 | dprintk(1, "querybuf: index out of range.\n"); |
19bc5133 | 458 | goto done; |
7a7d9a89 MCC |
459 | } |
460 | if (unlikely(NULL == q->bufs[b->index])) { | |
e2c77314 | 461 | dprintk(1, "querybuf: buffer is null.\n"); |
19bc5133 | 462 | goto done; |
7a7d9a89 | 463 | } |
19bc5133 | 464 | |
e2c77314 | 465 | videobuf_status(q, b, q->bufs[b->index], q->type); |
19bc5133 BP |
466 | |
467 | ret = 0; | |
468 | done: | |
64f9477f | 469 | mutex_unlock(&q->vb_lock); |
19bc5133 | 470 | return ret; |
7a7d9a89 MCC |
471 | } |
472 | ||
473 | int videobuf_qbuf(struct videobuf_queue *q, | |
474 | struct v4l2_buffer *b) | |
475 | { | |
476 | struct videobuf_buffer *buf; | |
477 | enum v4l2_field field; | |
e2c77314 | 478 | unsigned long flags = 0; |
7a7d9a89 MCC |
479 | int retval; |
480 | ||
e2c77314 | 481 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 482 | |
9900132f ML |
483 | if (b->memory == V4L2_MEMORY_MMAP) |
484 | down_read(¤t->mm->mmap_sem); | |
485 | ||
64f9477f | 486 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
487 | retval = -EBUSY; |
488 | if (q->reading) { | |
e2c77314 | 489 | dprintk(1, "qbuf: Reading running...\n"); |
7a7d9a89 MCC |
490 | goto done; |
491 | } | |
492 | retval = -EINVAL; | |
493 | if (b->type != q->type) { | |
e2c77314 | 494 | dprintk(1, "qbuf: Wrong type.\n"); |
7a7d9a89 MCC |
495 | goto done; |
496 | } | |
497 | if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) { | |
e2c77314 | 498 | dprintk(1, "qbuf: index out of range.\n"); |
7a7d9a89 MCC |
499 | goto done; |
500 | } | |
501 | buf = q->bufs[b->index]; | |
502 | if (NULL == buf) { | |
e2c77314 | 503 | dprintk(1, "qbuf: buffer is null.\n"); |
7a7d9a89 MCC |
504 | goto done; |
505 | } | |
e2c77314 | 506 | MAGIC_CHECK(buf->magic, MAGIC_BUFFER); |
7a7d9a89 | 507 | if (buf->memory != b->memory) { |
e2c77314 | 508 | dprintk(1, "qbuf: memory type is wrong.\n"); |
7a7d9a89 MCC |
509 | goto done; |
510 | } | |
0fc0686e | 511 | if (buf->state != VIDEOBUF_NEEDS_INIT && buf->state != VIDEOBUF_IDLE) { |
e2c77314 | 512 | dprintk(1, "qbuf: buffer is already queued or active.\n"); |
7a7d9a89 MCC |
513 | goto done; |
514 | } | |
515 | ||
516 | if (b->flags & V4L2_BUF_FLAG_INPUT) { | |
517 | if (b->input >= q->inputs) { | |
e2c77314 | 518 | dprintk(1, "qbuf: wrong input.\n"); |
7a7d9a89 MCC |
519 | goto done; |
520 | } | |
521 | buf->input = b->input; | |
522 | } else { | |
523 | buf->input = UNSET; | |
524 | } | |
525 | ||
526 | switch (b->memory) { | |
527 | case V4L2_MEMORY_MMAP: | |
528 | if (0 == buf->baddr) { | |
e2c77314 MCC |
529 | dprintk(1, "qbuf: mmap requested " |
530 | "but buffer addr is zero!\n"); | |
7a7d9a89 MCC |
531 | goto done; |
532 | } | |
533 | break; | |
534 | case V4L2_MEMORY_USERPTR: | |
535 | if (b->length < buf->bsize) { | |
e2c77314 | 536 | dprintk(1, "qbuf: buffer length is not enough\n"); |
7a7d9a89 MCC |
537 | goto done; |
538 | } | |
e2c77314 MCC |
539 | if (VIDEOBUF_NEEDS_INIT != buf->state && |
540 | buf->baddr != b->m.userptr) | |
541 | q->ops->buf_release(q, buf); | |
7a7d9a89 MCC |
542 | buf->baddr = b->m.userptr; |
543 | break; | |
544 | case V4L2_MEMORY_OVERLAY: | |
545 | buf->boff = b->m.offset; | |
546 | break; | |
547 | default: | |
e2c77314 | 548 | dprintk(1, "qbuf: wrong memory type\n"); |
7a7d9a89 MCC |
549 | goto done; |
550 | } | |
551 | ||
e2c77314 | 552 | dprintk(1, "qbuf: requesting next field\n"); |
7a7d9a89 | 553 | field = videobuf_next_field(q); |
e2c77314 | 554 | retval = q->ops->buf_prepare(q, buf, field); |
7a7d9a89 | 555 | if (0 != retval) { |
e2c77314 | 556 | dprintk(1, "qbuf: buffer_prepare returned %d\n", retval); |
7a7d9a89 MCC |
557 | goto done; |
558 | } | |
559 | ||
e2c77314 | 560 | list_add_tail(&buf->stream, &q->stream); |
7a7d9a89 | 561 | if (q->streaming) { |
0cf4daee | 562 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 563 | q->ops->buf_queue(q, buf); |
0cf4daee | 564 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 | 565 | } |
e2c77314 | 566 | dprintk(1, "qbuf: succeded\n"); |
7a7d9a89 | 567 | retval = 0; |
137d1cb1 | 568 | wake_up_interruptible_sync(&q->wait); |
7a7d9a89 MCC |
569 | |
570 | done: | |
64f9477f | 571 | mutex_unlock(&q->vb_lock); |
9900132f ML |
572 | |
573 | if (b->memory == V4L2_MEMORY_MMAP) | |
574 | up_read(¤t->mm->mmap_sem); | |
575 | ||
7a7d9a89 MCC |
576 | return retval; |
577 | } | |
578 | ||
137d1cb1 BP |
579 | |
580 | /* Locking: Caller holds q->vb_lock */ | |
581 | static int stream_next_buffer_check_queue(struct videobuf_queue *q, int noblock) | |
7a7d9a89 | 582 | { |
7a7d9a89 MCC |
583 | int retval; |
584 | ||
137d1cb1 BP |
585 | checks: |
586 | if (!q->streaming) { | |
587 | dprintk(1, "next_buffer: Not streaming\n"); | |
588 | retval = -EINVAL; | |
7a7d9a89 MCC |
589 | goto done; |
590 | } | |
137d1cb1 | 591 | |
7a7d9a89 | 592 | if (list_empty(&q->stream)) { |
137d1cb1 BP |
593 | if (noblock) { |
594 | retval = -EAGAIN; | |
595 | dprintk(2, "next_buffer: no buffers to dequeue\n"); | |
596 | goto done; | |
597 | } else { | |
598 | dprintk(2, "next_buffer: waiting on buffer\n"); | |
599 | ||
600 | /* Drop lock to avoid deadlock with qbuf */ | |
601 | mutex_unlock(&q->vb_lock); | |
602 | ||
603 | /* Checking list_empty and streaming is safe without | |
604 | * locks because we goto checks to validate while | |
605 | * holding locks before proceeding */ | |
606 | retval = wait_event_interruptible(q->wait, | |
607 | !list_empty(&q->stream) || !q->streaming); | |
608 | mutex_lock(&q->vb_lock); | |
609 | ||
610 | if (retval) | |
611 | goto done; | |
612 | ||
613 | goto checks; | |
614 | } | |
7a7d9a89 | 615 | } |
137d1cb1 BP |
616 | |
617 | retval = 0; | |
618 | ||
619 | done: | |
620 | return retval; | |
621 | } | |
622 | ||
623 | ||
624 | /* Locking: Caller holds q->vb_lock */ | |
625 | static int stream_next_buffer(struct videobuf_queue *q, | |
626 | struct videobuf_buffer **vb, int nonblocking) | |
627 | { | |
628 | int retval; | |
629 | struct videobuf_buffer *buf = NULL; | |
630 | ||
631 | retval = stream_next_buffer_check_queue(q, nonblocking); | |
632 | if (retval) | |
633 | goto done; | |
634 | ||
7a7d9a89 MCC |
635 | buf = list_entry(q->stream.next, struct videobuf_buffer, stream); |
636 | retval = videobuf_waiton(buf, nonblocking, 1); | |
137d1cb1 BP |
637 | if (retval < 0) |
638 | goto done; | |
639 | ||
640 | *vb = buf; | |
641 | done: | |
642 | return retval; | |
643 | } | |
644 | ||
645 | int videobuf_dqbuf(struct videobuf_queue *q, | |
646 | struct v4l2_buffer *b, int nonblocking) | |
647 | { | |
648 | struct videobuf_buffer *buf = NULL; | |
649 | int retval; | |
650 | ||
651 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
652 | ||
e43d76b4 | 653 | mutex_lock(&q->vb_lock); |
137d1cb1 BP |
654 | |
655 | retval = stream_next_buffer(q, &buf, nonblocking); | |
7a7d9a89 | 656 | if (retval < 0) { |
137d1cb1 | 657 | dprintk(1, "dqbuf: next_buffer error: %i\n", retval); |
7a7d9a89 MCC |
658 | goto done; |
659 | } | |
137d1cb1 | 660 | |
7a7d9a89 | 661 | switch (buf->state) { |
0fc0686e | 662 | case VIDEOBUF_ERROR: |
e2c77314 | 663 | dprintk(1, "dqbuf: state is error\n"); |
7a7d9a89 | 664 | retval = -EIO; |
e2c77314 | 665 | CALL(q, sync, q, buf); |
0fc0686e | 666 | buf->state = VIDEOBUF_IDLE; |
7a7d9a89 | 667 | break; |
0fc0686e | 668 | case VIDEOBUF_DONE: |
e2c77314 MCC |
669 | dprintk(1, "dqbuf: state is done\n"); |
670 | CALL(q, sync, q, buf); | |
0fc0686e | 671 | buf->state = VIDEOBUF_IDLE; |
7a7d9a89 MCC |
672 | break; |
673 | default: | |
e2c77314 | 674 | dprintk(1, "dqbuf: state invalid\n"); |
7a7d9a89 MCC |
675 | retval = -EINVAL; |
676 | goto done; | |
677 | } | |
678 | list_del(&buf->stream); | |
e2c77314 MCC |
679 | memset(b, 0, sizeof(*b)); |
680 | videobuf_status(q, b, buf, q->type); | |
7a7d9a89 MCC |
681 | |
682 | done: | |
64f9477f | 683 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
684 | return retval; |
685 | } | |
686 | ||
687 | int videobuf_streamon(struct videobuf_queue *q) | |
688 | { | |
689 | struct videobuf_buffer *buf; | |
e2c77314 | 690 | unsigned long flags = 0; |
7a7d9a89 MCC |
691 | int retval; |
692 | ||
64f9477f | 693 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
694 | retval = -EBUSY; |
695 | if (q->reading) | |
696 | goto done; | |
697 | retval = 0; | |
698 | if (q->streaming) | |
699 | goto done; | |
700 | q->streaming = 1; | |
0cf4daee | 701 | spin_lock_irqsave(q->irqlock, flags); |
a991f44b | 702 | list_for_each_entry(buf, &q->stream, stream) |
0fc0686e | 703 | if (buf->state == VIDEOBUF_PREPARED) |
e2c77314 | 704 | q->ops->buf_queue(q, buf); |
0cf4daee | 705 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 | 706 | |
137d1cb1 | 707 | wake_up_interruptible_sync(&q->wait); |
7a7d9a89 | 708 | done: |
64f9477f | 709 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
710 | return retval; |
711 | } | |
712 | ||
64f9477f | 713 | /* Locking: Caller holds q->vb_lock */ |
19bc5133 | 714 | static int __videobuf_streamoff(struct videobuf_queue *q) |
7a7d9a89 | 715 | { |
7a7d9a89 | 716 | if (!q->streaming) |
19bc5133 BP |
717 | return -EINVAL; |
718 | ||
7a7d9a89 | 719 | videobuf_queue_cancel(q); |
7a7d9a89 | 720 | |
19bc5133 BP |
721 | return 0; |
722 | } | |
723 | ||
724 | int videobuf_streamoff(struct videobuf_queue *q) | |
725 | { | |
726 | int retval; | |
727 | ||
64f9477f | 728 | mutex_lock(&q->vb_lock); |
19bc5133 | 729 | retval = __videobuf_streamoff(q); |
64f9477f | 730 | mutex_unlock(&q->vb_lock); |
19bc5133 | 731 | |
7a7d9a89 MCC |
732 | return retval; |
733 | } | |
734 | ||
64f9477f | 735 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
736 | static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q, |
737 | char __user *data, | |
738 | size_t count, loff_t *ppos) | |
739 | { | |
740 | enum v4l2_field field; | |
e2c77314 | 741 | unsigned long flags = 0; |
7a7d9a89 MCC |
742 | int retval; |
743 | ||
e2c77314 | 744 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 MCC |
745 | |
746 | /* setup stuff */ | |
747 | q->read_buf = videobuf_alloc(q); | |
748 | if (NULL == q->read_buf) | |
749 | return -ENOMEM; | |
750 | ||
751 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
752 | q->read_buf->baddr = (unsigned long)data; | |
753 | q->read_buf->bsize = count; | |
754 | ||
755 | field = videobuf_next_field(q); | |
e2c77314 | 756 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
7a7d9a89 MCC |
757 | if (0 != retval) |
758 | goto done; | |
759 | ||
760 | /* start capture & wait */ | |
0cf4daee | 761 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 762 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee | 763 | spin_unlock_irqrestore(q->irqlock, flags); |
e2c77314 | 764 | retval = videobuf_waiton(q->read_buf, 0, 0); |
7a7d9a89 | 765 | if (0 == retval) { |
e2c77314 | 766 | CALL(q, sync, q, q->read_buf); |
0fc0686e | 767 | if (VIDEOBUF_ERROR == q->read_buf->state) |
7a7d9a89 MCC |
768 | retval = -EIO; |
769 | else | |
770 | retval = q->read_buf->size; | |
771 | } | |
772 | ||
773 | done: | |
774 | /* cleanup */ | |
e2c77314 | 775 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
776 | kfree(q->read_buf); |
777 | q->read_buf = NULL; | |
778 | return retval; | |
779 | } | |
780 | ||
781 | ssize_t videobuf_read_one(struct videobuf_queue *q, | |
782 | char __user *data, size_t count, loff_t *ppos, | |
783 | int nonblocking) | |
784 | { | |
785 | enum v4l2_field field; | |
e2c77314 | 786 | unsigned long flags = 0; |
7daa4a88 | 787 | unsigned size = 0, nbufs = 1; |
7a7d9a89 MCC |
788 | int retval; |
789 | ||
e2c77314 | 790 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 791 | |
64f9477f | 792 | mutex_lock(&q->vb_lock); |
7a7d9a89 | 793 | |
e2c77314 | 794 | q->ops->buf_setup(q, &nbufs, &size); |
7a7d9a89 MCC |
795 | |
796 | if (NULL == q->read_buf && | |
797 | count >= size && | |
798 | !nonblocking) { | |
e2c77314 | 799 | retval = videobuf_read_zerocopy(q, data, count, ppos); |
7a7d9a89 MCC |
800 | if (retval >= 0 || retval == -EIO) |
801 | /* ok, all done */ | |
802 | goto done; | |
803 | /* fallback to kernel bounce buffer on failures */ | |
804 | } | |
805 | ||
806 | if (NULL == q->read_buf) { | |
807 | /* need to capture a new frame */ | |
808 | retval = -ENOMEM; | |
809 | q->read_buf = videobuf_alloc(q); | |
810 | ||
e2c77314 | 811 | dprintk(1, "video alloc=0x%p\n", q->read_buf); |
7a7d9a89 MCC |
812 | if (NULL == q->read_buf) |
813 | goto done; | |
814 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
815 | q->read_buf->bsize = count; /* preferred size */ | |
816 | field = videobuf_next_field(q); | |
e2c77314 | 817 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
7a7d9a89 MCC |
818 | |
819 | if (0 != retval) { | |
e2c77314 | 820 | kfree(q->read_buf); |
7a7d9a89 MCC |
821 | q->read_buf = NULL; |
822 | goto done; | |
823 | } | |
7a7d9a89 | 824 | |
0cf4daee | 825 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 826 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee BP |
827 | spin_unlock_irqrestore(q->irqlock, flags); |
828 | ||
7a7d9a89 MCC |
829 | q->read_off = 0; |
830 | } | |
831 | ||
832 | /* wait until capture is done */ | |
833 | retval = videobuf_waiton(q->read_buf, nonblocking, 1); | |
834 | if (0 != retval) | |
835 | goto done; | |
836 | ||
e2c77314 | 837 | CALL(q, sync, q, q->read_buf); |
7a7d9a89 | 838 | |
0fc0686e | 839 | if (VIDEOBUF_ERROR == q->read_buf->state) { |
7a7d9a89 | 840 | /* catch I/O errors */ |
e2c77314 | 841 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
842 | kfree(q->read_buf); |
843 | q->read_buf = NULL; | |
844 | retval = -EIO; | |
845 | goto done; | |
846 | } | |
847 | ||
848 | /* Copy to userspace */ | |
e2c77314 MCC |
849 | retval = CALL(q, video_copy_to_user, q, data, count, nonblocking); |
850 | if (retval < 0) | |
7a7d9a89 MCC |
851 | goto done; |
852 | ||
853 | q->read_off += retval; | |
854 | if (q->read_off == q->read_buf->size) { | |
855 | /* all data copied, cleanup */ | |
e2c77314 | 856 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
857 | kfree(q->read_buf); |
858 | q->read_buf = NULL; | |
859 | } | |
860 | ||
861 | done: | |
64f9477f | 862 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
863 | return retval; |
864 | } | |
865 | ||
64f9477f | 866 | /* Locking: Caller holds q->vb_lock */ |
225ba900 | 867 | static int __videobuf_read_start(struct videobuf_queue *q) |
7a7d9a89 MCC |
868 | { |
869 | enum v4l2_field field; | |
e2c77314 | 870 | unsigned long flags = 0; |
49ee718e | 871 | unsigned int count = 0, size = 0; |
7a7d9a89 MCC |
872 | int err, i; |
873 | ||
e2c77314 | 874 | q->ops->buf_setup(q, &count, &size); |
7a7d9a89 MCC |
875 | if (count < 2) |
876 | count = 2; | |
877 | if (count > VIDEO_MAX_FRAME) | |
878 | count = VIDEO_MAX_FRAME; | |
879 | size = PAGE_ALIGN(size); | |
880 | ||
19bc5133 | 881 | err = __videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR); |
49ee718e | 882 | if (err < 0) |
7a7d9a89 MCC |
883 | return err; |
884 | ||
49ee718e BP |
885 | count = err; |
886 | ||
7a7d9a89 MCC |
887 | for (i = 0; i < count; i++) { |
888 | field = videobuf_next_field(q); | |
e2c77314 | 889 | err = q->ops->buf_prepare(q, q->bufs[i], field); |
7a7d9a89 MCC |
890 | if (err) |
891 | return err; | |
892 | list_add_tail(&q->bufs[i]->stream, &q->stream); | |
893 | } | |
0cf4daee | 894 | spin_lock_irqsave(q->irqlock, flags); |
7a7d9a89 | 895 | for (i = 0; i < count; i++) |
e2c77314 | 896 | q->ops->buf_queue(q, q->bufs[i]); |
0cf4daee | 897 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
898 | q->reading = 1; |
899 | return 0; | |
900 | } | |
901 | ||
19bc5133 | 902 | static void __videobuf_read_stop(struct videobuf_queue *q) |
7a7d9a89 MCC |
903 | { |
904 | int i; | |
905 | ||
906 | videobuf_queue_cancel(q); | |
19bc5133 | 907 | __videobuf_mmap_free(q); |
7a7d9a89 MCC |
908 | INIT_LIST_HEAD(&q->stream); |
909 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
910 | if (NULL == q->bufs[i]) | |
911 | continue; | |
912 | kfree(q->bufs[i]); | |
913 | q->bufs[i] = NULL; | |
914 | } | |
915 | q->read_buf = NULL; | |
e2c77314 | 916 | |
19bc5133 BP |
917 | } |
918 | ||
19fb1457 MCC |
919 | int videobuf_read_start(struct videobuf_queue *q) |
920 | { | |
921 | int rc; | |
922 | ||
64f9477f | 923 | mutex_lock(&q->vb_lock); |
19fb1457 | 924 | rc = __videobuf_read_start(q); |
64f9477f | 925 | mutex_unlock(&q->vb_lock); |
19fb1457 MCC |
926 | |
927 | return rc; | |
928 | } | |
929 | ||
19bc5133 BP |
930 | void videobuf_read_stop(struct videobuf_queue *q) |
931 | { | |
64f9477f | 932 | mutex_lock(&q->vb_lock); |
19bc5133 | 933 | __videobuf_read_stop(q); |
64f9477f | 934 | mutex_unlock(&q->vb_lock); |
19bc5133 BP |
935 | } |
936 | ||
937 | void videobuf_stop(struct videobuf_queue *q) | |
938 | { | |
64f9477f | 939 | mutex_lock(&q->vb_lock); |
19bc5133 BP |
940 | |
941 | if (q->streaming) | |
942 | __videobuf_streamoff(q); | |
943 | ||
944 | if (q->reading) | |
945 | __videobuf_read_stop(q); | |
946 | ||
64f9477f | 947 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
948 | } |
949 | ||
19bc5133 | 950 | |
7a7d9a89 MCC |
951 | ssize_t videobuf_read_stream(struct videobuf_queue *q, |
952 | char __user *data, size_t count, loff_t *ppos, | |
953 | int vbihack, int nonblocking) | |
954 | { | |
955 | int rc, retval; | |
e2c77314 | 956 | unsigned long flags = 0; |
7a7d9a89 | 957 | |
e2c77314 | 958 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 959 | |
7e28adb2 | 960 | dprintk(2, "%s\n", __func__); |
64f9477f | 961 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
962 | retval = -EBUSY; |
963 | if (q->streaming) | |
964 | goto done; | |
965 | if (!q->reading) { | |
3f84307a | 966 | retval = __videobuf_read_start(q); |
7a7d9a89 MCC |
967 | if (retval < 0) |
968 | goto done; | |
969 | } | |
970 | ||
971 | retval = 0; | |
972 | while (count > 0) { | |
973 | /* get / wait for data */ | |
974 | if (NULL == q->read_buf) { | |
975 | q->read_buf = list_entry(q->stream.next, | |
976 | struct videobuf_buffer, | |
977 | stream); | |
978 | list_del(&q->read_buf->stream); | |
979 | q->read_off = 0; | |
980 | } | |
981 | rc = videobuf_waiton(q->read_buf, nonblocking, 1); | |
982 | if (rc < 0) { | |
983 | if (0 == retval) | |
984 | retval = rc; | |
985 | break; | |
986 | } | |
987 | ||
0fc0686e | 988 | if (q->read_buf->state == VIDEOBUF_DONE) { |
e2c77314 | 989 | rc = CALL(q, copy_stream, q, data + retval, count, |
7a7d9a89 MCC |
990 | retval, vbihack, nonblocking); |
991 | if (rc < 0) { | |
992 | retval = rc; | |
993 | break; | |
994 | } | |
995 | retval += rc; | |
996 | count -= rc; | |
997 | q->read_off += rc; | |
998 | } else { | |
999 | /* some error */ | |
1000 | q->read_off = q->read_buf->size; | |
1001 | if (0 == retval) | |
1002 | retval = -EIO; | |
1003 | } | |
1004 | ||
1005 | /* requeue buffer when done with copying */ | |
1006 | if (q->read_off == q->read_buf->size) { | |
1007 | list_add_tail(&q->read_buf->stream, | |
1008 | &q->stream); | |
0cf4daee | 1009 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 1010 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee | 1011 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
1012 | q->read_buf = NULL; |
1013 | } | |
1014 | if (retval < 0) | |
1015 | break; | |
1016 | } | |
1017 | ||
1018 | done: | |
64f9477f | 1019 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
1020 | return retval; |
1021 | } | |
1022 | ||
1023 | unsigned int videobuf_poll_stream(struct file *file, | |
1024 | struct videobuf_queue *q, | |
1025 | poll_table *wait) | |
1026 | { | |
1027 | struct videobuf_buffer *buf = NULL; | |
1028 | unsigned int rc = 0; | |
1029 | ||
64f9477f | 1030 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
1031 | if (q->streaming) { |
1032 | if (!list_empty(&q->stream)) | |
1033 | buf = list_entry(q->stream.next, | |
1034 | struct videobuf_buffer, stream); | |
1035 | } else { | |
1036 | if (!q->reading) | |
3f84307a | 1037 | __videobuf_read_start(q); |
7a7d9a89 MCC |
1038 | if (!q->reading) { |
1039 | rc = POLLERR; | |
1040 | } else if (NULL == q->read_buf) { | |
1041 | q->read_buf = list_entry(q->stream.next, | |
1042 | struct videobuf_buffer, | |
1043 | stream); | |
1044 | list_del(&q->read_buf->stream); | |
1045 | q->read_off = 0; | |
1046 | } | |
1047 | buf = q->read_buf; | |
1048 | } | |
1049 | if (!buf) | |
1050 | rc = POLLERR; | |
1051 | ||
1052 | if (0 == rc) { | |
1053 | poll_wait(file, &buf->done, wait); | |
0fc0686e BP |
1054 | if (buf->state == VIDEOBUF_DONE || |
1055 | buf->state == VIDEOBUF_ERROR) | |
7a7d9a89 MCC |
1056 | rc = POLLIN|POLLRDNORM; |
1057 | } | |
64f9477f | 1058 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
1059 | return rc; |
1060 | } | |
1061 | ||
7a7d9a89 MCC |
1062 | int videobuf_mmap_mapper(struct videobuf_queue *q, |
1063 | struct vm_area_struct *vma) | |
1064 | { | |
1065 | int retval; | |
1066 | ||
e2c77314 | 1067 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1068 | |
64f9477f | 1069 | mutex_lock(&q->vb_lock); |
e2c77314 | 1070 | retval = CALL(q, mmap_mapper, q, vma); |
d05051c8 | 1071 | q->is_mmapped = 1; |
64f9477f | 1072 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
1073 | |
1074 | return retval; | |
1075 | } | |
1076 | ||
1077 | #ifdef CONFIG_VIDEO_V4L1_COMPAT | |
1078 | int videobuf_cgmbuf(struct videobuf_queue *q, | |
1079 | struct video_mbuf *mbuf, int count) | |
1080 | { | |
1081 | struct v4l2_requestbuffers req; | |
e2c77314 | 1082 | int rc, i; |
7a7d9a89 | 1083 | |
e2c77314 | 1084 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1085 | |
e2c77314 | 1086 | memset(&req, 0, sizeof(req)); |
7a7d9a89 MCC |
1087 | req.type = q->type; |
1088 | req.count = count; | |
1089 | req.memory = V4L2_MEMORY_MMAP; | |
e2c77314 | 1090 | rc = videobuf_reqbufs(q, &req); |
7a7d9a89 MCC |
1091 | if (rc < 0) |
1092 | return rc; | |
1093 | ||
1094 | mbuf->frames = req.count; | |
1095 | mbuf->size = 0; | |
1096 | for (i = 0; i < mbuf->frames; i++) { | |
1097 | mbuf->offsets[i] = q->bufs[i]->boff; | |
1098 | mbuf->size += q->bufs[i]->bsize; | |
1099 | } | |
1100 | ||
1101 | return 0; | |
1102 | } | |
a13625c5 | 1103 | EXPORT_SYMBOL_GPL(videobuf_cgmbuf); |
7a7d9a89 MCC |
1104 | #endif |
1105 | ||
1106 | /* --------------------------------------------------------------------- */ | |
1107 | ||
1108 | EXPORT_SYMBOL_GPL(videobuf_waiton); | |
1109 | EXPORT_SYMBOL_GPL(videobuf_iolock); | |
1110 | ||
1111 | EXPORT_SYMBOL_GPL(videobuf_alloc); | |
1112 | ||
d4cae5a5 | 1113 | EXPORT_SYMBOL_GPL(videobuf_queue_core_init); |
7a7d9a89 MCC |
1114 | EXPORT_SYMBOL_GPL(videobuf_queue_cancel); |
1115 | EXPORT_SYMBOL_GPL(videobuf_queue_is_busy); | |
1116 | ||
1117 | EXPORT_SYMBOL_GPL(videobuf_next_field); | |
1118 | EXPORT_SYMBOL_GPL(videobuf_reqbufs); | |
1119 | EXPORT_SYMBOL_GPL(videobuf_querybuf); | |
1120 | EXPORT_SYMBOL_GPL(videobuf_qbuf); | |
1121 | EXPORT_SYMBOL_GPL(videobuf_dqbuf); | |
7a7d9a89 MCC |
1122 | EXPORT_SYMBOL_GPL(videobuf_streamon); |
1123 | EXPORT_SYMBOL_GPL(videobuf_streamoff); | |
1124 | ||
19fb1457 | 1125 | EXPORT_SYMBOL_GPL(videobuf_read_start); |
7a7d9a89 | 1126 | EXPORT_SYMBOL_GPL(videobuf_read_stop); |
19bc5133 | 1127 | EXPORT_SYMBOL_GPL(videobuf_stop); |
7a7d9a89 MCC |
1128 | EXPORT_SYMBOL_GPL(videobuf_read_stream); |
1129 | EXPORT_SYMBOL_GPL(videobuf_read_one); | |
1130 | EXPORT_SYMBOL_GPL(videobuf_poll_stream); | |
1131 | ||
81b2dbca | 1132 | EXPORT_SYMBOL_GPL(__videobuf_mmap_setup); |
7a7d9a89 MCC |
1133 | EXPORT_SYMBOL_GPL(videobuf_mmap_setup); |
1134 | EXPORT_SYMBOL_GPL(videobuf_mmap_free); | |
1135 | EXPORT_SYMBOL_GPL(videobuf_mmap_mapper); |