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> |
d43c36dc | 20 | #include <linux/sched.h> |
7a7d9a89 MCC |
21 | #include <linux/slab.h> |
22 | #include <linux/interrupt.h> | |
23 | ||
24 | #include <media/videobuf-core.h> | |
25 | ||
26 | #define MAGIC_BUFFER 0x20070728 | |
7a02264c PO |
27 | #define MAGIC_CHECK(is, should) \ |
28 | do { \ | |
29 | if (unlikely((is) != (should))) { \ | |
30 | printk(KERN_ERR \ | |
31 | "magic mismatch: %x (expected %x)\n", \ | |
32 | is, should); \ | |
33 | BUG(); \ | |
34 | } \ | |
35 | } while (0) | |
7a7d9a89 | 36 | |
e2c77314 | 37 | static int debug; |
7a7d9a89 MCC |
38 | module_param(debug, int, 0644); |
39 | ||
40 | MODULE_DESCRIPTION("helper module to manage video4linux buffers"); | |
41 | MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>"); | |
42 | MODULE_LICENSE("GPL"); | |
43 | ||
7a02264c PO |
44 | #define dprintk(level, fmt, arg...) \ |
45 | do { \ | |
46 | if (debug >= level) \ | |
47 | printk(KERN_DEBUG "vbuf: " fmt, ## arg); \ | |
48 | } while (0) | |
7a7d9a89 MCC |
49 | |
50 | /* --------------------------------------------------------------------- */ | |
51 | ||
52 | #define CALL(q, f, arg...) \ | |
e2c77314 | 53 | ((q->int_ops->f) ? q->int_ops->f(arg) : 0) |
7a7d9a89 | 54 | |
a4cf4cac | 55 | struct videobuf_buffer *videobuf_alloc(struct videobuf_queue *q) |
7a7d9a89 MCC |
56 | { |
57 | struct videobuf_buffer *vb; | |
58 | ||
e2c77314 | 59 | BUG_ON(q->msize < sizeof(*vb)); |
7a7d9a89 MCC |
60 | |
61 | if (!q->int_ops || !q->int_ops->alloc) { | |
62 | printk(KERN_ERR "No specific ops defined!\n"); | |
63 | BUG(); | |
64 | } | |
65 | ||
66 | vb = q->int_ops->alloc(q->msize); | |
7a7d9a89 MCC |
67 | if (NULL != vb) { |
68 | init_waitqueue_head(&vb->done); | |
7a02264c | 69 | vb->magic = MAGIC_BUFFER; |
7a7d9a89 MCC |
70 | } |
71 | ||
72 | return vb; | |
73 | } | |
7a02264c | 74 | EXPORT_SYMBOL_GPL(videobuf_alloc); |
7a7d9a89 | 75 | |
009a9059 BP |
76 | #define WAITON_CONDITION (vb->state != VIDEOBUF_ACTIVE &&\ |
77 | vb->state != VIDEOBUF_QUEUED) | |
7a7d9a89 MCC |
78 | int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr) |
79 | { | |
e2c77314 | 80 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
009a9059 BP |
81 | |
82 | if (non_blocking) { | |
83 | if (WAITON_CONDITION) | |
84 | return 0; | |
85 | else | |
86 | return -EAGAIN; | |
7a7d9a89 | 87 | } |
009a9059 BP |
88 | |
89 | if (intr) | |
90 | return wait_event_interruptible(vb->done, WAITON_CONDITION); | |
91 | else | |
92 | wait_event(vb->done, WAITON_CONDITION); | |
93 | ||
94 | return 0; | |
7a7d9a89 | 95 | } |
7a02264c | 96 | EXPORT_SYMBOL_GPL(videobuf_waiton); |
7a7d9a89 | 97 | |
e2c77314 | 98 | int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb, |
7a7d9a89 MCC |
99 | struct v4l2_framebuffer *fbuf) |
100 | { | |
e2c77314 MCC |
101 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
102 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
7a7d9a89 | 103 | |
e2c77314 | 104 | return CALL(q, iolock, q, vb, fbuf); |
7a7d9a89 | 105 | } |
7a02264c | 106 | EXPORT_SYMBOL_GPL(videobuf_iolock); |
7a7d9a89 | 107 | |
7a02264c PO |
108 | void *videobuf_queue_to_vmalloc(struct videobuf_queue *q, |
109 | struct videobuf_buffer *buf) | |
59d34489 | 110 | { |
a6a3a17b HH |
111 | if (q->int_ops->vmalloc) |
112 | return q->int_ops->vmalloc(buf); | |
113 | else | |
114 | return NULL; | |
59d34489 MCC |
115 | } |
116 | EXPORT_SYMBOL_GPL(videobuf_queue_to_vmalloc); | |
117 | ||
7a7d9a89 MCC |
118 | /* --------------------------------------------------------------------- */ |
119 | ||
120 | ||
e2c77314 | 121 | void videobuf_queue_core_init(struct videobuf_queue *q, |
38a54f35 | 122 | const struct videobuf_queue_ops *ops, |
e9bcf667 | 123 | struct device *dev, |
7a7d9a89 MCC |
124 | spinlock_t *irqlock, |
125 | enum v4l2_buf_type type, | |
126 | enum v4l2_field field, | |
127 | unsigned int msize, | |
d4cae5a5 MCC |
128 | void *priv, |
129 | struct videobuf_qtype_ops *int_ops) | |
7a7d9a89 | 130 | { |
96ceea27 | 131 | BUG_ON(!q); |
e2c77314 | 132 | memset(q, 0, sizeof(*q)); |
d4cae5a5 MCC |
133 | q->irqlock = irqlock; |
134 | q->dev = dev; | |
135 | q->type = type; | |
136 | q->field = field; | |
137 | q->msize = msize; | |
138 | q->ops = ops; | |
7a7d9a89 | 139 | q->priv_data = priv; |
d4cae5a5 | 140 | q->int_ops = int_ops; |
7a7d9a89 MCC |
141 | |
142 | /* All buffer operations are mandatory */ | |
e2c77314 MCC |
143 | BUG_ON(!q->ops->buf_setup); |
144 | BUG_ON(!q->ops->buf_prepare); | |
145 | BUG_ON(!q->ops->buf_queue); | |
146 | BUG_ON(!q->ops->buf_release); | |
7a7d9a89 | 147 | |
0cf4daee BP |
148 | /* Lock is mandatory for queue_cancel to work */ |
149 | BUG_ON(!irqlock); | |
150 | ||
d4cae5a5 | 151 | /* Having implementations for abstract methods are mandatory */ |
e2c77314 | 152 | BUG_ON(!q->int_ops); |
d4cae5a5 | 153 | |
64f9477f | 154 | mutex_init(&q->vb_lock); |
137d1cb1 | 155 | init_waitqueue_head(&q->wait); |
7a7d9a89 MCC |
156 | INIT_LIST_HEAD(&q->stream); |
157 | } | |
7a02264c | 158 | EXPORT_SYMBOL_GPL(videobuf_queue_core_init); |
7a7d9a89 | 159 | |
19bc5133 | 160 | /* Locking: Only usage in bttv unsafe find way to remove */ |
7a7d9a89 MCC |
161 | int videobuf_queue_is_busy(struct videobuf_queue *q) |
162 | { | |
163 | int i; | |
164 | ||
e2c77314 | 165 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 MCC |
166 | |
167 | if (q->streaming) { | |
e2c77314 | 168 | dprintk(1, "busy: streaming active\n"); |
7a7d9a89 MCC |
169 | return 1; |
170 | } | |
171 | if (q->reading) { | |
e2c77314 | 172 | dprintk(1, "busy: pending read #1\n"); |
7a7d9a89 MCC |
173 | return 1; |
174 | } | |
175 | if (q->read_buf) { | |
e2c77314 | 176 | dprintk(1, "busy: pending read #2\n"); |
7a7d9a89 MCC |
177 | return 1; |
178 | } | |
179 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
180 | if (NULL == q->bufs[i]) | |
181 | continue; | |
851c0c96 | 182 | if (q->bufs[i]->map) { |
e2c77314 | 183 | dprintk(1, "busy: buffer #%d mapped\n", i); |
7a7d9a89 MCC |
184 | return 1; |
185 | } | |
0fc0686e | 186 | if (q->bufs[i]->state == VIDEOBUF_QUEUED) { |
e2c77314 | 187 | dprintk(1, "busy: buffer #%d queued\n", i); |
7a7d9a89 MCC |
188 | return 1; |
189 | } | |
0fc0686e | 190 | if (q->bufs[i]->state == VIDEOBUF_ACTIVE) { |
e2c77314 | 191 | dprintk(1, "busy: buffer #%d avtive\n", i); |
7a7d9a89 MCC |
192 | return 1; |
193 | } | |
194 | } | |
195 | return 0; | |
196 | } | |
7a02264c | 197 | EXPORT_SYMBOL_GPL(videobuf_queue_is_busy); |
7a7d9a89 | 198 | |
64f9477f | 199 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
200 | void videobuf_queue_cancel(struct videobuf_queue *q) |
201 | { | |
e2c77314 | 202 | unsigned long flags = 0; |
7a7d9a89 MCC |
203 | int i; |
204 | ||
137d1cb1 BP |
205 | q->streaming = 0; |
206 | q->reading = 0; | |
207 | wake_up_interruptible_sync(&q->wait); | |
208 | ||
7a7d9a89 | 209 | /* remove queued buffers from list */ |
0cf4daee | 210 | spin_lock_irqsave(q->irqlock, flags); |
7a7d9a89 MCC |
211 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
212 | if (NULL == q->bufs[i]) | |
213 | continue; | |
0fc0686e | 214 | if (q->bufs[i]->state == VIDEOBUF_QUEUED) { |
7a7d9a89 | 215 | list_del(&q->bufs[i]->queue); |
0fc0686e | 216 | q->bufs[i]->state = VIDEOBUF_ERROR; |
b608f432 | 217 | wake_up_all(&q->bufs[i]->done); |
7a7d9a89 MCC |
218 | } |
219 | } | |
0cf4daee | 220 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
221 | |
222 | /* free all buffers + clear queue */ | |
223 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
224 | if (NULL == q->bufs[i]) | |
225 | continue; | |
e2c77314 | 226 | q->ops->buf_release(q, q->bufs[i]); |
7a7d9a89 MCC |
227 | } |
228 | INIT_LIST_HEAD(&q->stream); | |
229 | } | |
7a02264c | 230 | EXPORT_SYMBOL_GPL(videobuf_queue_cancel); |
7a7d9a89 MCC |
231 | |
232 | /* --------------------------------------------------------------------- */ | |
233 | ||
64f9477f | 234 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
235 | enum v4l2_field videobuf_next_field(struct videobuf_queue *q) |
236 | { | |
237 | enum v4l2_field field = q->field; | |
238 | ||
239 | BUG_ON(V4L2_FIELD_ANY == field); | |
240 | ||
241 | if (V4L2_FIELD_ALTERNATE == field) { | |
242 | if (V4L2_FIELD_TOP == q->last) { | |
243 | field = V4L2_FIELD_BOTTOM; | |
244 | q->last = V4L2_FIELD_BOTTOM; | |
245 | } else { | |
246 | field = V4L2_FIELD_TOP; | |
247 | q->last = V4L2_FIELD_TOP; | |
248 | } | |
249 | } | |
250 | return field; | |
251 | } | |
7a02264c | 252 | EXPORT_SYMBOL_GPL(videobuf_next_field); |
7a7d9a89 | 253 | |
64f9477f | 254 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
255 | static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b, |
256 | struct videobuf_buffer *vb, enum v4l2_buf_type type) | |
257 | { | |
e2c77314 MCC |
258 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
259 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
7a7d9a89 MCC |
260 | |
261 | b->index = vb->i; | |
262 | b->type = type; | |
263 | ||
264 | b->memory = vb->memory; | |
265 | switch (b->memory) { | |
266 | case V4L2_MEMORY_MMAP: | |
267 | b->m.offset = vb->boff; | |
268 | b->length = vb->bsize; | |
269 | break; | |
270 | case V4L2_MEMORY_USERPTR: | |
271 | b->m.userptr = vb->baddr; | |
272 | b->length = vb->bsize; | |
273 | break; | |
274 | case V4L2_MEMORY_OVERLAY: | |
275 | b->m.offset = vb->boff; | |
276 | break; | |
277 | } | |
278 | ||
279 | b->flags = 0; | |
851c0c96 | 280 | if (vb->map) |
7a7d9a89 MCC |
281 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
282 | ||
283 | switch (vb->state) { | |
0fc0686e BP |
284 | case VIDEOBUF_PREPARED: |
285 | case VIDEOBUF_QUEUED: | |
286 | case VIDEOBUF_ACTIVE: | |
7a7d9a89 MCC |
287 | b->flags |= V4L2_BUF_FLAG_QUEUED; |
288 | break; | |
0fc0686e BP |
289 | case VIDEOBUF_DONE: |
290 | case VIDEOBUF_ERROR: | |
7a7d9a89 MCC |
291 | b->flags |= V4L2_BUF_FLAG_DONE; |
292 | break; | |
0fc0686e BP |
293 | case VIDEOBUF_NEEDS_INIT: |
294 | case VIDEOBUF_IDLE: | |
7a7d9a89 MCC |
295 | /* nothing */ |
296 | break; | |
297 | } | |
298 | ||
299 | if (vb->input != UNSET) { | |
300 | b->flags |= V4L2_BUF_FLAG_INPUT; | |
301 | b->input = vb->input; | |
302 | } | |
303 | ||
304 | b->field = vb->field; | |
305 | b->timestamp = vb->ts; | |
306 | b->bytesused = vb->size; | |
307 | b->sequence = vb->field_count >> 1; | |
308 | } | |
309 | ||
64f9477f | 310 | /* Locking: Caller holds q->vb_lock */ |
19bc5133 BP |
311 | static int __videobuf_mmap_free(struct videobuf_queue *q) |
312 | { | |
313 | int i; | |
19bc5133 BP |
314 | |
315 | if (!q) | |
316 | return 0; | |
317 | ||
e2c77314 | 318 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
19bc5133 | 319 | |
53aaf076 HV |
320 | for (i = 0; i < VIDEO_MAX_FRAME; i++) |
321 | if (q->bufs[i] && q->bufs[i]->map) | |
322 | return -EBUSY; | |
d05051c8 | 323 | |
19bc5133 BP |
324 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
325 | if (NULL == q->bufs[i]) | |
326 | continue; | |
e2c77314 | 327 | q->ops->buf_release(q, q->bufs[i]); |
19bc5133 BP |
328 | kfree(q->bufs[i]); |
329 | q->bufs[i] = NULL; | |
330 | } | |
331 | ||
53aaf076 | 332 | return 0; |
19bc5133 BP |
333 | } |
334 | ||
335 | int videobuf_mmap_free(struct videobuf_queue *q) | |
336 | { | |
337 | int ret; | |
64f9477f | 338 | mutex_lock(&q->vb_lock); |
19bc5133 | 339 | ret = __videobuf_mmap_free(q); |
64f9477f | 340 | mutex_unlock(&q->vb_lock); |
19bc5133 BP |
341 | return ret; |
342 | } | |
7a02264c | 343 | EXPORT_SYMBOL_GPL(videobuf_mmap_free); |
19bc5133 | 344 | |
64f9477f | 345 | /* Locking: Caller holds q->vb_lock */ |
81b2dbca | 346 | int __videobuf_mmap_setup(struct videobuf_queue *q, |
19bc5133 BP |
347 | unsigned int bcount, unsigned int bsize, |
348 | enum v4l2_memory memory) | |
349 | { | |
350 | unsigned int i; | |
351 | int err; | |
352 | ||
e2c77314 | 353 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
19bc5133 BP |
354 | |
355 | err = __videobuf_mmap_free(q); | |
356 | if (0 != err) | |
357 | return err; | |
358 | ||
359 | /* Allocate and initialize buffers */ | |
360 | for (i = 0; i < bcount; i++) { | |
361 | q->bufs[i] = videobuf_alloc(q); | |
362 | ||
7a02264c | 363 | if (NULL == q->bufs[i]) |
19bc5133 BP |
364 | break; |
365 | ||
366 | q->bufs[i]->i = i; | |
367 | q->bufs[i]->input = UNSET; | |
368 | q->bufs[i]->memory = memory; | |
369 | q->bufs[i]->bsize = bsize; | |
370 | switch (memory) { | |
371 | case V4L2_MEMORY_MMAP: | |
7cbefad0 | 372 | q->bufs[i]->boff = PAGE_ALIGN(bsize) * i; |
19bc5133 BP |
373 | break; |
374 | case V4L2_MEMORY_USERPTR: | |
375 | case V4L2_MEMORY_OVERLAY: | |
376 | /* nothing */ | |
377 | break; | |
378 | } | |
379 | } | |
380 | ||
381 | if (!i) | |
382 | return -ENOMEM; | |
383 | ||
7a02264c | 384 | dprintk(1, "mmap setup: %d buffers, %d bytes each\n", i, bsize); |
19bc5133 BP |
385 | |
386 | return i; | |
387 | } | |
7a02264c | 388 | EXPORT_SYMBOL_GPL(__videobuf_mmap_setup); |
19bc5133 BP |
389 | |
390 | int videobuf_mmap_setup(struct videobuf_queue *q, | |
391 | unsigned int bcount, unsigned int bsize, | |
392 | enum v4l2_memory memory) | |
393 | { | |
394 | int ret; | |
64f9477f | 395 | mutex_lock(&q->vb_lock); |
19bc5133 | 396 | ret = __videobuf_mmap_setup(q, bcount, bsize, memory); |
64f9477f | 397 | mutex_unlock(&q->vb_lock); |
19bc5133 BP |
398 | return ret; |
399 | } | |
7a02264c | 400 | EXPORT_SYMBOL_GPL(videobuf_mmap_setup); |
19bc5133 | 401 | |
7a7d9a89 MCC |
402 | int videobuf_reqbufs(struct videobuf_queue *q, |
403 | struct v4l2_requestbuffers *req) | |
404 | { | |
e2c77314 | 405 | unsigned int size, count; |
7a7d9a89 MCC |
406 | int retval; |
407 | ||
7a7d9a89 | 408 | if (req->count < 1) { |
e2c77314 | 409 | dprintk(1, "reqbufs: count invalid (%d)\n", req->count); |
7a7d9a89 MCC |
410 | return -EINVAL; |
411 | } | |
19bc5133 | 412 | |
7a7d9a89 MCC |
413 | if (req->memory != V4L2_MEMORY_MMAP && |
414 | req->memory != V4L2_MEMORY_USERPTR && | |
415 | req->memory != V4L2_MEMORY_OVERLAY) { | |
e2c77314 | 416 | dprintk(1, "reqbufs: memory type invalid\n"); |
7a7d9a89 MCC |
417 | return -EINVAL; |
418 | } | |
419 | ||
64f9477f | 420 | mutex_lock(&q->vb_lock); |
19bc5133 | 421 | if (req->type != q->type) { |
e2c77314 | 422 | dprintk(1, "reqbufs: queue type invalid\n"); |
19bc5133 BP |
423 | retval = -EINVAL; |
424 | goto done; | |
425 | } | |
426 | ||
7a7d9a89 | 427 | if (q->streaming) { |
e2c77314 | 428 | dprintk(1, "reqbufs: streaming already exists\n"); |
00f98d08 BP |
429 | retval = -EBUSY; |
430 | goto done; | |
7a7d9a89 MCC |
431 | } |
432 | if (!list_empty(&q->stream)) { | |
e2c77314 | 433 | dprintk(1, "reqbufs: stream running\n"); |
00f98d08 BP |
434 | retval = -EBUSY; |
435 | goto done; | |
7a7d9a89 MCC |
436 | } |
437 | ||
7a7d9a89 MCC |
438 | count = req->count; |
439 | if (count > VIDEO_MAX_FRAME) | |
440 | count = VIDEO_MAX_FRAME; | |
441 | size = 0; | |
e2c77314 | 442 | q->ops->buf_setup(q, &count, &size); |
296372e3 MN |
443 | dprintk(1, "reqbufs: bufs=%d, size=0x%x [%u pages total]\n", |
444 | count, size, | |
7a02264c | 445 | (unsigned int)((count * PAGE_ALIGN(size)) >> PAGE_SHIFT)); |
7a7d9a89 | 446 | |
e2c77314 | 447 | retval = __videobuf_mmap_setup(q, count, size, req->memory); |
7a7d9a89 | 448 | if (retval < 0) { |
e2c77314 | 449 | dprintk(1, "reqbufs: mmap setup returned %d\n", retval); |
7a7d9a89 MCC |
450 | goto done; |
451 | } | |
452 | ||
49ee718e | 453 | req->count = retval; |
925d74ae | 454 | retval = 0; |
7a7d9a89 MCC |
455 | |
456 | done: | |
64f9477f | 457 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
458 | return retval; |
459 | } | |
7a02264c | 460 | EXPORT_SYMBOL_GPL(videobuf_reqbufs); |
7a7d9a89 MCC |
461 | |
462 | int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b) | |
463 | { | |
19bc5133 BP |
464 | int ret = -EINVAL; |
465 | ||
64f9477f | 466 | mutex_lock(&q->vb_lock); |
7a7d9a89 | 467 | if (unlikely(b->type != q->type)) { |
e2c77314 | 468 | dprintk(1, "querybuf: Wrong type.\n"); |
19bc5133 | 469 | goto done; |
7a7d9a89 | 470 | } |
223ffe5f | 471 | if (unlikely(b->index >= VIDEO_MAX_FRAME)) { |
e2c77314 | 472 | dprintk(1, "querybuf: index out of range.\n"); |
19bc5133 | 473 | goto done; |
7a7d9a89 MCC |
474 | } |
475 | if (unlikely(NULL == q->bufs[b->index])) { | |
e2c77314 | 476 | dprintk(1, "querybuf: buffer is null.\n"); |
19bc5133 | 477 | goto done; |
7a7d9a89 | 478 | } |
19bc5133 | 479 | |
e2c77314 | 480 | videobuf_status(q, b, q->bufs[b->index], q->type); |
19bc5133 BP |
481 | |
482 | ret = 0; | |
483 | done: | |
64f9477f | 484 | mutex_unlock(&q->vb_lock); |
19bc5133 | 485 | return ret; |
7a7d9a89 | 486 | } |
7a02264c | 487 | EXPORT_SYMBOL_GPL(videobuf_querybuf); |
7a7d9a89 | 488 | |
7a02264c | 489 | int videobuf_qbuf(struct videobuf_queue *q, struct v4l2_buffer *b) |
7a7d9a89 MCC |
490 | { |
491 | struct videobuf_buffer *buf; | |
492 | enum v4l2_field field; | |
e2c77314 | 493 | unsigned long flags = 0; |
7a7d9a89 MCC |
494 | int retval; |
495 | ||
e2c77314 | 496 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 497 | |
9900132f ML |
498 | if (b->memory == V4L2_MEMORY_MMAP) |
499 | down_read(¤t->mm->mmap_sem); | |
500 | ||
64f9477f | 501 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
502 | retval = -EBUSY; |
503 | if (q->reading) { | |
e2c77314 | 504 | dprintk(1, "qbuf: Reading running...\n"); |
7a7d9a89 MCC |
505 | goto done; |
506 | } | |
507 | retval = -EINVAL; | |
508 | if (b->type != q->type) { | |
e2c77314 | 509 | dprintk(1, "qbuf: Wrong type.\n"); |
7a7d9a89 MCC |
510 | goto done; |
511 | } | |
223ffe5f | 512 | if (b->index >= VIDEO_MAX_FRAME) { |
e2c77314 | 513 | dprintk(1, "qbuf: index out of range.\n"); |
7a7d9a89 MCC |
514 | goto done; |
515 | } | |
516 | buf = q->bufs[b->index]; | |
517 | if (NULL == buf) { | |
e2c77314 | 518 | dprintk(1, "qbuf: buffer is null.\n"); |
7a7d9a89 MCC |
519 | goto done; |
520 | } | |
e2c77314 | 521 | MAGIC_CHECK(buf->magic, MAGIC_BUFFER); |
7a7d9a89 | 522 | if (buf->memory != b->memory) { |
e2c77314 | 523 | dprintk(1, "qbuf: memory type is wrong.\n"); |
7a7d9a89 MCC |
524 | goto done; |
525 | } | |
0fc0686e | 526 | if (buf->state != VIDEOBUF_NEEDS_INIT && buf->state != VIDEOBUF_IDLE) { |
e2c77314 | 527 | dprintk(1, "qbuf: buffer is already queued or active.\n"); |
7a7d9a89 MCC |
528 | goto done; |
529 | } | |
530 | ||
531 | if (b->flags & V4L2_BUF_FLAG_INPUT) { | |
532 | if (b->input >= q->inputs) { | |
e2c77314 | 533 | dprintk(1, "qbuf: wrong input.\n"); |
7a7d9a89 MCC |
534 | goto done; |
535 | } | |
536 | buf->input = b->input; | |
537 | } else { | |
538 | buf->input = UNSET; | |
539 | } | |
540 | ||
541 | switch (b->memory) { | |
542 | case V4L2_MEMORY_MMAP: | |
543 | if (0 == buf->baddr) { | |
e2c77314 MCC |
544 | dprintk(1, "qbuf: mmap requested " |
545 | "but buffer addr is zero!\n"); | |
7a7d9a89 MCC |
546 | goto done; |
547 | } | |
548 | break; | |
549 | case V4L2_MEMORY_USERPTR: | |
550 | if (b->length < buf->bsize) { | |
e2c77314 | 551 | dprintk(1, "qbuf: buffer length is not enough\n"); |
7a7d9a89 MCC |
552 | goto done; |
553 | } | |
e2c77314 MCC |
554 | if (VIDEOBUF_NEEDS_INIT != buf->state && |
555 | buf->baddr != b->m.userptr) | |
556 | q->ops->buf_release(q, buf); | |
7a7d9a89 MCC |
557 | buf->baddr = b->m.userptr; |
558 | break; | |
559 | case V4L2_MEMORY_OVERLAY: | |
560 | buf->boff = b->m.offset; | |
561 | break; | |
562 | default: | |
e2c77314 | 563 | dprintk(1, "qbuf: wrong memory type\n"); |
7a7d9a89 MCC |
564 | goto done; |
565 | } | |
566 | ||
e2c77314 | 567 | dprintk(1, "qbuf: requesting next field\n"); |
7a7d9a89 | 568 | field = videobuf_next_field(q); |
e2c77314 | 569 | retval = q->ops->buf_prepare(q, buf, field); |
7a7d9a89 | 570 | if (0 != retval) { |
e2c77314 | 571 | dprintk(1, "qbuf: buffer_prepare returned %d\n", retval); |
7a7d9a89 MCC |
572 | goto done; |
573 | } | |
574 | ||
e2c77314 | 575 | list_add_tail(&buf->stream, &q->stream); |
7a7d9a89 | 576 | if (q->streaming) { |
0cf4daee | 577 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 578 | q->ops->buf_queue(q, buf); |
0cf4daee | 579 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 | 580 | } |
771075bb | 581 | dprintk(1, "qbuf: succeeded\n"); |
7a7d9a89 | 582 | retval = 0; |
137d1cb1 | 583 | wake_up_interruptible_sync(&q->wait); |
7a7d9a89 | 584 | |
7a02264c | 585 | done: |
64f9477f | 586 | mutex_unlock(&q->vb_lock); |
9900132f ML |
587 | |
588 | if (b->memory == V4L2_MEMORY_MMAP) | |
589 | up_read(¤t->mm->mmap_sem); | |
590 | ||
7a7d9a89 MCC |
591 | return retval; |
592 | } | |
7a02264c | 593 | EXPORT_SYMBOL_GPL(videobuf_qbuf); |
137d1cb1 BP |
594 | |
595 | /* Locking: Caller holds q->vb_lock */ | |
596 | static int stream_next_buffer_check_queue(struct videobuf_queue *q, int noblock) | |
7a7d9a89 | 597 | { |
7a7d9a89 MCC |
598 | int retval; |
599 | ||
137d1cb1 BP |
600 | checks: |
601 | if (!q->streaming) { | |
602 | dprintk(1, "next_buffer: Not streaming\n"); | |
603 | retval = -EINVAL; | |
7a7d9a89 MCC |
604 | goto done; |
605 | } | |
137d1cb1 | 606 | |
7a7d9a89 | 607 | if (list_empty(&q->stream)) { |
137d1cb1 BP |
608 | if (noblock) { |
609 | retval = -EAGAIN; | |
610 | dprintk(2, "next_buffer: no buffers to dequeue\n"); | |
611 | goto done; | |
612 | } else { | |
613 | dprintk(2, "next_buffer: waiting on buffer\n"); | |
614 | ||
615 | /* Drop lock to avoid deadlock with qbuf */ | |
616 | mutex_unlock(&q->vb_lock); | |
617 | ||
618 | /* Checking list_empty and streaming is safe without | |
619 | * locks because we goto checks to validate while | |
620 | * holding locks before proceeding */ | |
621 | retval = wait_event_interruptible(q->wait, | |
622 | !list_empty(&q->stream) || !q->streaming); | |
623 | mutex_lock(&q->vb_lock); | |
624 | ||
625 | if (retval) | |
626 | goto done; | |
627 | ||
628 | goto checks; | |
629 | } | |
7a7d9a89 | 630 | } |
137d1cb1 BP |
631 | |
632 | retval = 0; | |
633 | ||
634 | done: | |
635 | return retval; | |
636 | } | |
637 | ||
137d1cb1 BP |
638 | /* Locking: Caller holds q->vb_lock */ |
639 | static int stream_next_buffer(struct videobuf_queue *q, | |
640 | struct videobuf_buffer **vb, int nonblocking) | |
641 | { | |
642 | int retval; | |
643 | struct videobuf_buffer *buf = NULL; | |
644 | ||
645 | retval = stream_next_buffer_check_queue(q, nonblocking); | |
646 | if (retval) | |
647 | goto done; | |
648 | ||
7a7d9a89 MCC |
649 | buf = list_entry(q->stream.next, struct videobuf_buffer, stream); |
650 | retval = videobuf_waiton(buf, nonblocking, 1); | |
137d1cb1 BP |
651 | if (retval < 0) |
652 | goto done; | |
653 | ||
654 | *vb = buf; | |
655 | done: | |
656 | return retval; | |
657 | } | |
658 | ||
659 | int videobuf_dqbuf(struct videobuf_queue *q, | |
7a02264c | 660 | struct v4l2_buffer *b, int nonblocking) |
137d1cb1 BP |
661 | { |
662 | struct videobuf_buffer *buf = NULL; | |
663 | int retval; | |
664 | ||
665 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
666 | ||
e43d76b4 | 667 | mutex_lock(&q->vb_lock); |
137d1cb1 BP |
668 | |
669 | retval = stream_next_buffer(q, &buf, nonblocking); | |
7a7d9a89 | 670 | if (retval < 0) { |
137d1cb1 | 671 | dprintk(1, "dqbuf: next_buffer error: %i\n", retval); |
7a7d9a89 MCC |
672 | goto done; |
673 | } | |
137d1cb1 | 674 | |
7a7d9a89 | 675 | switch (buf->state) { |
0fc0686e | 676 | case VIDEOBUF_ERROR: |
e2c77314 | 677 | dprintk(1, "dqbuf: state is error\n"); |
7a7d9a89 | 678 | retval = -EIO; |
e2c77314 | 679 | CALL(q, sync, q, buf); |
0fc0686e | 680 | buf->state = VIDEOBUF_IDLE; |
7a7d9a89 | 681 | break; |
0fc0686e | 682 | case VIDEOBUF_DONE: |
e2c77314 MCC |
683 | dprintk(1, "dqbuf: state is done\n"); |
684 | CALL(q, sync, q, buf); | |
0fc0686e | 685 | buf->state = VIDEOBUF_IDLE; |
7a7d9a89 MCC |
686 | break; |
687 | default: | |
e2c77314 | 688 | dprintk(1, "dqbuf: state invalid\n"); |
7a7d9a89 MCC |
689 | retval = -EINVAL; |
690 | goto done; | |
691 | } | |
692 | list_del(&buf->stream); | |
e2c77314 MCC |
693 | memset(b, 0, sizeof(*b)); |
694 | videobuf_status(q, b, buf, q->type); | |
7a02264c | 695 | done: |
64f9477f | 696 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
697 | return retval; |
698 | } | |
7a02264c | 699 | EXPORT_SYMBOL_GPL(videobuf_dqbuf); |
7a7d9a89 MCC |
700 | |
701 | int videobuf_streamon(struct videobuf_queue *q) | |
702 | { | |
703 | struct videobuf_buffer *buf; | |
e2c77314 | 704 | unsigned long flags = 0; |
7a7d9a89 MCC |
705 | int retval; |
706 | ||
64f9477f | 707 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
708 | retval = -EBUSY; |
709 | if (q->reading) | |
710 | goto done; | |
711 | retval = 0; | |
712 | if (q->streaming) | |
713 | goto done; | |
714 | q->streaming = 1; | |
0cf4daee | 715 | spin_lock_irqsave(q->irqlock, flags); |
a991f44b | 716 | list_for_each_entry(buf, &q->stream, stream) |
0fc0686e | 717 | if (buf->state == VIDEOBUF_PREPARED) |
e2c77314 | 718 | q->ops->buf_queue(q, buf); |
0cf4daee | 719 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 | 720 | |
137d1cb1 | 721 | wake_up_interruptible_sync(&q->wait); |
7a02264c | 722 | done: |
64f9477f | 723 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
724 | return retval; |
725 | } | |
7a02264c | 726 | EXPORT_SYMBOL_GPL(videobuf_streamon); |
7a7d9a89 | 727 | |
64f9477f | 728 | /* Locking: Caller holds q->vb_lock */ |
19bc5133 | 729 | static int __videobuf_streamoff(struct videobuf_queue *q) |
7a7d9a89 | 730 | { |
7a7d9a89 | 731 | if (!q->streaming) |
19bc5133 BP |
732 | return -EINVAL; |
733 | ||
7a7d9a89 | 734 | videobuf_queue_cancel(q); |
7a7d9a89 | 735 | |
19bc5133 BP |
736 | return 0; |
737 | } | |
738 | ||
739 | int videobuf_streamoff(struct videobuf_queue *q) | |
740 | { | |
741 | int retval; | |
742 | ||
64f9477f | 743 | mutex_lock(&q->vb_lock); |
19bc5133 | 744 | retval = __videobuf_streamoff(q); |
64f9477f | 745 | mutex_unlock(&q->vb_lock); |
19bc5133 | 746 | |
7a7d9a89 MCC |
747 | return retval; |
748 | } | |
7a02264c | 749 | EXPORT_SYMBOL_GPL(videobuf_streamoff); |
7a7d9a89 | 750 | |
64f9477f | 751 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
752 | static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q, |
753 | char __user *data, | |
754 | size_t count, loff_t *ppos) | |
755 | { | |
756 | enum v4l2_field field; | |
e2c77314 | 757 | unsigned long flags = 0; |
7a7d9a89 MCC |
758 | int retval; |
759 | ||
e2c77314 | 760 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 MCC |
761 | |
762 | /* setup stuff */ | |
763 | q->read_buf = videobuf_alloc(q); | |
764 | if (NULL == q->read_buf) | |
765 | return -ENOMEM; | |
766 | ||
767 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
768 | q->read_buf->baddr = (unsigned long)data; | |
769 | q->read_buf->bsize = count; | |
770 | ||
771 | field = videobuf_next_field(q); | |
e2c77314 | 772 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
7a7d9a89 MCC |
773 | if (0 != retval) |
774 | goto done; | |
775 | ||
776 | /* start capture & wait */ | |
0cf4daee | 777 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 778 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee | 779 | spin_unlock_irqrestore(q->irqlock, flags); |
e2c77314 | 780 | retval = videobuf_waiton(q->read_buf, 0, 0); |
7a7d9a89 | 781 | if (0 == retval) { |
e2c77314 | 782 | CALL(q, sync, q, q->read_buf); |
0fc0686e | 783 | if (VIDEOBUF_ERROR == q->read_buf->state) |
7a7d9a89 MCC |
784 | retval = -EIO; |
785 | else | |
786 | retval = q->read_buf->size; | |
787 | } | |
788 | ||
7a02264c | 789 | done: |
7a7d9a89 | 790 | /* cleanup */ |
e2c77314 | 791 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
792 | kfree(q->read_buf); |
793 | q->read_buf = NULL; | |
794 | return retval; | |
795 | } | |
796 | ||
797 | ssize_t videobuf_read_one(struct videobuf_queue *q, | |
798 | char __user *data, size_t count, loff_t *ppos, | |
799 | int nonblocking) | |
800 | { | |
801 | enum v4l2_field field; | |
e2c77314 | 802 | unsigned long flags = 0; |
7daa4a88 | 803 | unsigned size = 0, nbufs = 1; |
7a7d9a89 MCC |
804 | int retval; |
805 | ||
e2c77314 | 806 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 807 | |
64f9477f | 808 | mutex_lock(&q->vb_lock); |
7a7d9a89 | 809 | |
e2c77314 | 810 | q->ops->buf_setup(q, &nbufs, &size); |
7a7d9a89 MCC |
811 | |
812 | if (NULL == q->read_buf && | |
813 | count >= size && | |
814 | !nonblocking) { | |
e2c77314 | 815 | retval = videobuf_read_zerocopy(q, data, count, ppos); |
7a7d9a89 MCC |
816 | if (retval >= 0 || retval == -EIO) |
817 | /* ok, all done */ | |
818 | goto done; | |
819 | /* fallback to kernel bounce buffer on failures */ | |
820 | } | |
821 | ||
822 | if (NULL == q->read_buf) { | |
823 | /* need to capture a new frame */ | |
824 | retval = -ENOMEM; | |
825 | q->read_buf = videobuf_alloc(q); | |
826 | ||
e2c77314 | 827 | dprintk(1, "video alloc=0x%p\n", q->read_buf); |
7a7d9a89 MCC |
828 | if (NULL == q->read_buf) |
829 | goto done; | |
830 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
831 | q->read_buf->bsize = count; /* preferred size */ | |
832 | field = videobuf_next_field(q); | |
e2c77314 | 833 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
7a7d9a89 MCC |
834 | |
835 | if (0 != retval) { | |
e2c77314 | 836 | kfree(q->read_buf); |
7a7d9a89 MCC |
837 | q->read_buf = NULL; |
838 | goto done; | |
839 | } | |
7a7d9a89 | 840 | |
0cf4daee | 841 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 842 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee BP |
843 | spin_unlock_irqrestore(q->irqlock, flags); |
844 | ||
7a7d9a89 MCC |
845 | q->read_off = 0; |
846 | } | |
847 | ||
848 | /* wait until capture is done */ | |
849 | retval = videobuf_waiton(q->read_buf, nonblocking, 1); | |
850 | if (0 != retval) | |
851 | goto done; | |
852 | ||
e2c77314 | 853 | CALL(q, sync, q, q->read_buf); |
7a7d9a89 | 854 | |
0fc0686e | 855 | if (VIDEOBUF_ERROR == q->read_buf->state) { |
7a7d9a89 | 856 | /* catch I/O errors */ |
e2c77314 | 857 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
858 | kfree(q->read_buf); |
859 | q->read_buf = NULL; | |
860 | retval = -EIO; | |
861 | goto done; | |
862 | } | |
863 | ||
864 | /* Copy to userspace */ | |
e2c77314 MCC |
865 | retval = CALL(q, video_copy_to_user, q, data, count, nonblocking); |
866 | if (retval < 0) | |
7a7d9a89 MCC |
867 | goto done; |
868 | ||
869 | q->read_off += retval; | |
870 | if (q->read_off == q->read_buf->size) { | |
871 | /* all data copied, cleanup */ | |
e2c77314 | 872 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
873 | kfree(q->read_buf); |
874 | q->read_buf = NULL; | |
875 | } | |
876 | ||
7a02264c | 877 | done: |
64f9477f | 878 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
879 | return retval; |
880 | } | |
7a02264c | 881 | EXPORT_SYMBOL_GPL(videobuf_read_one); |
7a7d9a89 | 882 | |
64f9477f | 883 | /* Locking: Caller holds q->vb_lock */ |
225ba900 | 884 | static int __videobuf_read_start(struct videobuf_queue *q) |
7a7d9a89 MCC |
885 | { |
886 | enum v4l2_field field; | |
e2c77314 | 887 | unsigned long flags = 0; |
49ee718e | 888 | unsigned int count = 0, size = 0; |
7a7d9a89 MCC |
889 | int err, i; |
890 | ||
e2c77314 | 891 | q->ops->buf_setup(q, &count, &size); |
7a7d9a89 MCC |
892 | if (count < 2) |
893 | count = 2; | |
894 | if (count > VIDEO_MAX_FRAME) | |
895 | count = VIDEO_MAX_FRAME; | |
896 | size = PAGE_ALIGN(size); | |
897 | ||
19bc5133 | 898 | err = __videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR); |
49ee718e | 899 | if (err < 0) |
7a7d9a89 MCC |
900 | return err; |
901 | ||
49ee718e BP |
902 | count = err; |
903 | ||
7a7d9a89 MCC |
904 | for (i = 0; i < count; i++) { |
905 | field = videobuf_next_field(q); | |
e2c77314 | 906 | err = q->ops->buf_prepare(q, q->bufs[i], field); |
7a7d9a89 MCC |
907 | if (err) |
908 | return err; | |
909 | list_add_tail(&q->bufs[i]->stream, &q->stream); | |
910 | } | |
0cf4daee | 911 | spin_lock_irqsave(q->irqlock, flags); |
7a7d9a89 | 912 | for (i = 0; i < count; i++) |
e2c77314 | 913 | q->ops->buf_queue(q, q->bufs[i]); |
0cf4daee | 914 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
915 | q->reading = 1; |
916 | return 0; | |
917 | } | |
918 | ||
19bc5133 | 919 | static void __videobuf_read_stop(struct videobuf_queue *q) |
7a7d9a89 MCC |
920 | { |
921 | int i; | |
922 | ||
923 | videobuf_queue_cancel(q); | |
19bc5133 | 924 | __videobuf_mmap_free(q); |
7a7d9a89 MCC |
925 | INIT_LIST_HEAD(&q->stream); |
926 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
927 | if (NULL == q->bufs[i]) | |
928 | continue; | |
929 | kfree(q->bufs[i]); | |
930 | q->bufs[i] = NULL; | |
931 | } | |
932 | q->read_buf = NULL; | |
19bc5133 BP |
933 | } |
934 | ||
19fb1457 MCC |
935 | int videobuf_read_start(struct videobuf_queue *q) |
936 | { | |
937 | int rc; | |
938 | ||
64f9477f | 939 | mutex_lock(&q->vb_lock); |
19fb1457 | 940 | rc = __videobuf_read_start(q); |
64f9477f | 941 | mutex_unlock(&q->vb_lock); |
19fb1457 MCC |
942 | |
943 | return rc; | |
944 | } | |
7a02264c | 945 | EXPORT_SYMBOL_GPL(videobuf_read_start); |
19fb1457 | 946 | |
19bc5133 BP |
947 | void videobuf_read_stop(struct videobuf_queue *q) |
948 | { | |
64f9477f | 949 | mutex_lock(&q->vb_lock); |
19bc5133 | 950 | __videobuf_read_stop(q); |
64f9477f | 951 | mutex_unlock(&q->vb_lock); |
19bc5133 | 952 | } |
7a02264c | 953 | EXPORT_SYMBOL_GPL(videobuf_read_stop); |
19bc5133 BP |
954 | |
955 | void videobuf_stop(struct videobuf_queue *q) | |
956 | { | |
64f9477f | 957 | mutex_lock(&q->vb_lock); |
19bc5133 BP |
958 | |
959 | if (q->streaming) | |
960 | __videobuf_streamoff(q); | |
961 | ||
962 | if (q->reading) | |
963 | __videobuf_read_stop(q); | |
964 | ||
64f9477f | 965 | mutex_unlock(&q->vb_lock); |
7a7d9a89 | 966 | } |
7a02264c | 967 | EXPORT_SYMBOL_GPL(videobuf_stop); |
19bc5133 | 968 | |
7a7d9a89 MCC |
969 | ssize_t videobuf_read_stream(struct videobuf_queue *q, |
970 | char __user *data, size_t count, loff_t *ppos, | |
971 | int vbihack, int nonblocking) | |
972 | { | |
973 | int rc, retval; | |
e2c77314 | 974 | unsigned long flags = 0; |
7a7d9a89 | 975 | |
e2c77314 | 976 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 977 | |
7e28adb2 | 978 | dprintk(2, "%s\n", __func__); |
64f9477f | 979 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
980 | retval = -EBUSY; |
981 | if (q->streaming) | |
982 | goto done; | |
983 | if (!q->reading) { | |
3f84307a | 984 | retval = __videobuf_read_start(q); |
7a7d9a89 MCC |
985 | if (retval < 0) |
986 | goto done; | |
987 | } | |
988 | ||
989 | retval = 0; | |
990 | while (count > 0) { | |
991 | /* get / wait for data */ | |
992 | if (NULL == q->read_buf) { | |
993 | q->read_buf = list_entry(q->stream.next, | |
994 | struct videobuf_buffer, | |
995 | stream); | |
996 | list_del(&q->read_buf->stream); | |
997 | q->read_off = 0; | |
998 | } | |
999 | rc = videobuf_waiton(q->read_buf, nonblocking, 1); | |
1000 | if (rc < 0) { | |
1001 | if (0 == retval) | |
1002 | retval = rc; | |
1003 | break; | |
1004 | } | |
1005 | ||
0fc0686e | 1006 | if (q->read_buf->state == VIDEOBUF_DONE) { |
e2c77314 | 1007 | rc = CALL(q, copy_stream, q, data + retval, count, |
7a7d9a89 MCC |
1008 | retval, vbihack, nonblocking); |
1009 | if (rc < 0) { | |
1010 | retval = rc; | |
1011 | break; | |
1012 | } | |
1013 | retval += rc; | |
1014 | count -= rc; | |
1015 | q->read_off += rc; | |
1016 | } else { | |
1017 | /* some error */ | |
1018 | q->read_off = q->read_buf->size; | |
1019 | if (0 == retval) | |
1020 | retval = -EIO; | |
1021 | } | |
1022 | ||
1023 | /* requeue buffer when done with copying */ | |
1024 | if (q->read_off == q->read_buf->size) { | |
1025 | list_add_tail(&q->read_buf->stream, | |
1026 | &q->stream); | |
0cf4daee | 1027 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 1028 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee | 1029 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
1030 | q->read_buf = NULL; |
1031 | } | |
1032 | if (retval < 0) | |
1033 | break; | |
1034 | } | |
1035 | ||
7a02264c | 1036 | done: |
64f9477f | 1037 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
1038 | return retval; |
1039 | } | |
7a02264c | 1040 | EXPORT_SYMBOL_GPL(videobuf_read_stream); |
7a7d9a89 MCC |
1041 | |
1042 | unsigned int videobuf_poll_stream(struct file *file, | |
1043 | struct videobuf_queue *q, | |
1044 | poll_table *wait) | |
1045 | { | |
1046 | struct videobuf_buffer *buf = NULL; | |
1047 | unsigned int rc = 0; | |
1048 | ||
64f9477f | 1049 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
1050 | if (q->streaming) { |
1051 | if (!list_empty(&q->stream)) | |
1052 | buf = list_entry(q->stream.next, | |
1053 | struct videobuf_buffer, stream); | |
1054 | } else { | |
1055 | if (!q->reading) | |
3f84307a | 1056 | __videobuf_read_start(q); |
7a7d9a89 MCC |
1057 | if (!q->reading) { |
1058 | rc = POLLERR; | |
1059 | } else if (NULL == q->read_buf) { | |
1060 | q->read_buf = list_entry(q->stream.next, | |
1061 | struct videobuf_buffer, | |
1062 | stream); | |
1063 | list_del(&q->read_buf->stream); | |
1064 | q->read_off = 0; | |
1065 | } | |
1066 | buf = q->read_buf; | |
1067 | } | |
1068 | if (!buf) | |
1069 | rc = POLLERR; | |
1070 | ||
1071 | if (0 == rc) { | |
1072 | poll_wait(file, &buf->done, wait); | |
0fc0686e BP |
1073 | if (buf->state == VIDEOBUF_DONE || |
1074 | buf->state == VIDEOBUF_ERROR) | |
7a7d9a89 MCC |
1075 | rc = POLLIN|POLLRDNORM; |
1076 | } | |
64f9477f | 1077 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
1078 | return rc; |
1079 | } | |
7a02264c | 1080 | EXPORT_SYMBOL_GPL(videobuf_poll_stream); |
7a7d9a89 | 1081 | |
7a02264c | 1082 | int videobuf_mmap_mapper(struct videobuf_queue *q, struct vm_area_struct *vma) |
7a7d9a89 MCC |
1083 | { |
1084 | int retval; | |
1085 | ||
e2c77314 | 1086 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1087 | |
64f9477f | 1088 | mutex_lock(&q->vb_lock); |
e2c77314 | 1089 | retval = CALL(q, mmap_mapper, q, vma); |
64f9477f | 1090 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
1091 | |
1092 | return retval; | |
1093 | } | |
7a02264c | 1094 | EXPORT_SYMBOL_GPL(videobuf_mmap_mapper); |
7a7d9a89 MCC |
1095 | |
1096 | #ifdef CONFIG_VIDEO_V4L1_COMPAT | |
1097 | int videobuf_cgmbuf(struct videobuf_queue *q, | |
1098 | struct video_mbuf *mbuf, int count) | |
1099 | { | |
1100 | struct v4l2_requestbuffers req; | |
e2c77314 | 1101 | int rc, i; |
7a7d9a89 | 1102 | |
e2c77314 | 1103 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1104 | |
e2c77314 | 1105 | memset(&req, 0, sizeof(req)); |
7a7d9a89 MCC |
1106 | req.type = q->type; |
1107 | req.count = count; | |
1108 | req.memory = V4L2_MEMORY_MMAP; | |
e2c77314 | 1109 | rc = videobuf_reqbufs(q, &req); |
7a7d9a89 MCC |
1110 | if (rc < 0) |
1111 | return rc; | |
1112 | ||
1113 | mbuf->frames = req.count; | |
1114 | mbuf->size = 0; | |
1115 | for (i = 0; i < mbuf->frames; i++) { | |
1116 | mbuf->offsets[i] = q->bufs[i]->boff; | |
7cbefad0 | 1117 | mbuf->size += PAGE_ALIGN(q->bufs[i]->bsize); |
7a7d9a89 MCC |
1118 | } |
1119 | ||
1120 | return 0; | |
1121 | } | |
a13625c5 | 1122 | EXPORT_SYMBOL_GPL(videobuf_cgmbuf); |
7a7d9a89 MCC |
1123 | #endif |
1124 |