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) |
a8d54e4c HV |
54 | #define CALLPTR(q, f, arg...) \ |
55 | ((q->int_ops->f) ? q->int_ops->f(arg) : NULL) | |
7a7d9a89 | 56 | |
33c38283 | 57 | struct videobuf_buffer *videobuf_alloc_vb(struct videobuf_queue *q) |
7a7d9a89 MCC |
58 | { |
59 | struct videobuf_buffer *vb; | |
60 | ||
e2c77314 | 61 | BUG_ON(q->msize < sizeof(*vb)); |
7a7d9a89 | 62 | |
33c38283 | 63 | if (!q->int_ops || !q->int_ops->alloc_vb) { |
7a7d9a89 MCC |
64 | printk(KERN_ERR "No specific ops defined!\n"); |
65 | BUG(); | |
66 | } | |
67 | ||
33c38283 | 68 | vb = q->int_ops->alloc_vb(q->msize); |
7a7d9a89 MCC |
69 | if (NULL != vb) { |
70 | init_waitqueue_head(&vb->done); | |
7a02264c | 71 | vb->magic = MAGIC_BUFFER; |
7a7d9a89 MCC |
72 | } |
73 | ||
74 | return vb; | |
75 | } | |
33c38283 | 76 | EXPORT_SYMBOL_GPL(videobuf_alloc_vb); |
7a7d9a89 | 77 | |
5eba1726 GL |
78 | static int state_neither_active_nor_queued(struct videobuf_queue *q, |
79 | struct videobuf_buffer *vb) | |
7a7d9a89 | 80 | { |
0e0809a5 HV |
81 | unsigned long flags; |
82 | bool rc; | |
83 | ||
84 | spin_lock_irqsave(q->irqlock, flags); | |
85 | rc = vb->state != VIDEOBUF_ACTIVE && vb->state != VIDEOBUF_QUEUED; | |
86 | spin_unlock_irqrestore(q->irqlock, flags); | |
87 | return rc; | |
88 | }; | |
89 | ||
90 | int videobuf_waiton(struct videobuf_queue *q, struct videobuf_buffer *vb, | |
91 | int non_blocking, int intr) | |
92 | { | |
93 | bool is_ext_locked; | |
94 | int ret = 0; | |
95 | ||
e2c77314 | 96 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
009a9059 BP |
97 | |
98 | if (non_blocking) { | |
5eba1726 | 99 | if (state_neither_active_nor_queued(q, vb)) |
009a9059 | 100 | return 0; |
0e0809a5 | 101 | return -EAGAIN; |
7a7d9a89 | 102 | } |
009a9059 | 103 | |
0e0809a5 HV |
104 | is_ext_locked = q->ext_lock && mutex_is_locked(q->ext_lock); |
105 | ||
106 | /* Release vdev lock to prevent this wait from blocking outside access to | |
107 | the device. */ | |
108 | if (is_ext_locked) | |
109 | mutex_unlock(q->ext_lock); | |
009a9059 | 110 | if (intr) |
5eba1726 GL |
111 | ret = wait_event_interruptible(vb->done, |
112 | state_neither_active_nor_queued(q, vb)); | |
009a9059 | 113 | else |
5eba1726 | 114 | wait_event(vb->done, state_neither_active_nor_queued(q, vb)); |
0e0809a5 HV |
115 | /* Relock */ |
116 | if (is_ext_locked) | |
117 | mutex_lock(q->ext_lock); | |
009a9059 | 118 | |
0e0809a5 | 119 | return ret; |
7a7d9a89 | 120 | } |
7a02264c | 121 | EXPORT_SYMBOL_GPL(videobuf_waiton); |
7a7d9a89 | 122 | |
e2c77314 | 123 | int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb, |
7a7d9a89 MCC |
124 | struct v4l2_framebuffer *fbuf) |
125 | { | |
e2c77314 MCC |
126 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
127 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
7a7d9a89 | 128 | |
e2c77314 | 129 | return CALL(q, iolock, q, vb, fbuf); |
7a7d9a89 | 130 | } |
7a02264c | 131 | EXPORT_SYMBOL_GPL(videobuf_iolock); |
7a7d9a89 | 132 | |
f4fce60e HV |
133 | void *videobuf_queue_to_vaddr(struct videobuf_queue *q, |
134 | struct videobuf_buffer *buf) | |
59d34489 | 135 | { |
037c75eb HV |
136 | if (q->int_ops->vaddr) |
137 | return q->int_ops->vaddr(buf); | |
f4fce60e | 138 | return NULL; |
59d34489 | 139 | } |
f4fce60e | 140 | EXPORT_SYMBOL_GPL(videobuf_queue_to_vaddr); |
59d34489 | 141 | |
7a7d9a89 MCC |
142 | /* --------------------------------------------------------------------- */ |
143 | ||
144 | ||
e2c77314 | 145 | void videobuf_queue_core_init(struct videobuf_queue *q, |
38a54f35 | 146 | const struct videobuf_queue_ops *ops, |
e9bcf667 | 147 | struct device *dev, |
7a7d9a89 MCC |
148 | spinlock_t *irqlock, |
149 | enum v4l2_buf_type type, | |
150 | enum v4l2_field field, | |
151 | unsigned int msize, | |
d4cae5a5 | 152 | void *priv, |
08bff03e HV |
153 | struct videobuf_qtype_ops *int_ops, |
154 | struct mutex *ext_lock) | |
7a7d9a89 | 155 | { |
96ceea27 | 156 | BUG_ON(!q); |
e2c77314 | 157 | memset(q, 0, sizeof(*q)); |
d4cae5a5 | 158 | q->irqlock = irqlock; |
08bff03e | 159 | q->ext_lock = ext_lock; |
d4cae5a5 MCC |
160 | q->dev = dev; |
161 | q->type = type; | |
162 | q->field = field; | |
163 | q->msize = msize; | |
164 | q->ops = ops; | |
7a7d9a89 | 165 | q->priv_data = priv; |
d4cae5a5 | 166 | q->int_ops = int_ops; |
7a7d9a89 MCC |
167 | |
168 | /* All buffer operations are mandatory */ | |
e2c77314 MCC |
169 | BUG_ON(!q->ops->buf_setup); |
170 | BUG_ON(!q->ops->buf_prepare); | |
171 | BUG_ON(!q->ops->buf_queue); | |
172 | BUG_ON(!q->ops->buf_release); | |
7a7d9a89 | 173 | |
0cf4daee BP |
174 | /* Lock is mandatory for queue_cancel to work */ |
175 | BUG_ON(!irqlock); | |
176 | ||
d4cae5a5 | 177 | /* Having implementations for abstract methods are mandatory */ |
e2c77314 | 178 | BUG_ON(!q->int_ops); |
d4cae5a5 | 179 | |
64f9477f | 180 | mutex_init(&q->vb_lock); |
137d1cb1 | 181 | init_waitqueue_head(&q->wait); |
7a7d9a89 MCC |
182 | INIT_LIST_HEAD(&q->stream); |
183 | } | |
7a02264c | 184 | EXPORT_SYMBOL_GPL(videobuf_queue_core_init); |
7a7d9a89 | 185 | |
19bc5133 | 186 | /* Locking: Only usage in bttv unsafe find way to remove */ |
7a7d9a89 MCC |
187 | int videobuf_queue_is_busy(struct videobuf_queue *q) |
188 | { | |
189 | int i; | |
190 | ||
e2c77314 | 191 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 MCC |
192 | |
193 | if (q->streaming) { | |
e2c77314 | 194 | dprintk(1, "busy: streaming active\n"); |
7a7d9a89 MCC |
195 | return 1; |
196 | } | |
197 | if (q->reading) { | |
e2c77314 | 198 | dprintk(1, "busy: pending read #1\n"); |
7a7d9a89 MCC |
199 | return 1; |
200 | } | |
201 | if (q->read_buf) { | |
e2c77314 | 202 | dprintk(1, "busy: pending read #2\n"); |
7a7d9a89 MCC |
203 | return 1; |
204 | } | |
205 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
206 | if (NULL == q->bufs[i]) | |
207 | continue; | |
851c0c96 | 208 | if (q->bufs[i]->map) { |
e2c77314 | 209 | dprintk(1, "busy: buffer #%d mapped\n", i); |
7a7d9a89 MCC |
210 | return 1; |
211 | } | |
0fc0686e | 212 | if (q->bufs[i]->state == VIDEOBUF_QUEUED) { |
e2c77314 | 213 | dprintk(1, "busy: buffer #%d queued\n", i); |
7a7d9a89 MCC |
214 | return 1; |
215 | } | |
0fc0686e | 216 | if (q->bufs[i]->state == VIDEOBUF_ACTIVE) { |
e2c77314 | 217 | dprintk(1, "busy: buffer #%d avtive\n", i); |
7a7d9a89 MCC |
218 | return 1; |
219 | } | |
220 | } | |
221 | return 0; | |
222 | } | |
7a02264c | 223 | EXPORT_SYMBOL_GPL(videobuf_queue_is_busy); |
7a7d9a89 | 224 | |
a438d6da PO |
225 | /** |
226 | * __videobuf_free() - free all the buffers and their control structures | |
227 | * | |
228 | * This function can only be called if streaming/reading is off, i.e. no buffers | |
229 | * are under control of the driver. | |
230 | */ | |
231 | /* Locking: Caller holds q->vb_lock */ | |
232 | static int __videobuf_free(struct videobuf_queue *q) | |
233 | { | |
234 | int i; | |
235 | ||
236 | dprintk(1, "%s\n", __func__); | |
237 | if (!q) | |
238 | return 0; | |
239 | ||
240 | if (q->streaming || q->reading) { | |
241 | dprintk(1, "Cannot free buffers when streaming or reading\n"); | |
242 | return -EBUSY; | |
243 | } | |
244 | ||
245 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
246 | ||
247 | for (i = 0; i < VIDEO_MAX_FRAME; i++) | |
248 | if (q->bufs[i] && q->bufs[i]->map) { | |
249 | dprintk(1, "Cannot free mmapped buffers\n"); | |
250 | return -EBUSY; | |
251 | } | |
252 | ||
253 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
254 | if (NULL == q->bufs[i]) | |
255 | continue; | |
256 | q->ops->buf_release(q, q->bufs[i]); | |
257 | kfree(q->bufs[i]); | |
258 | q->bufs[i] = NULL; | |
259 | } | |
260 | ||
261 | return 0; | |
262 | } | |
263 | ||
64f9477f | 264 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
265 | void videobuf_queue_cancel(struct videobuf_queue *q) |
266 | { | |
e2c77314 | 267 | unsigned long flags = 0; |
7a7d9a89 MCC |
268 | int i; |
269 | ||
137d1cb1 BP |
270 | q->streaming = 0; |
271 | q->reading = 0; | |
272 | wake_up_interruptible_sync(&q->wait); | |
273 | ||
7a7d9a89 | 274 | /* remove queued buffers from list */ |
0cf4daee | 275 | spin_lock_irqsave(q->irqlock, flags); |
7a7d9a89 MCC |
276 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
277 | if (NULL == q->bufs[i]) | |
278 | continue; | |
0fc0686e | 279 | if (q->bufs[i]->state == VIDEOBUF_QUEUED) { |
7a7d9a89 | 280 | list_del(&q->bufs[i]->queue); |
0fc0686e | 281 | q->bufs[i]->state = VIDEOBUF_ERROR; |
b608f432 | 282 | wake_up_all(&q->bufs[i]->done); |
7a7d9a89 MCC |
283 | } |
284 | } | |
0cf4daee | 285 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
286 | |
287 | /* free all buffers + clear queue */ | |
288 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
289 | if (NULL == q->bufs[i]) | |
290 | continue; | |
e2c77314 | 291 | q->ops->buf_release(q, q->bufs[i]); |
7a7d9a89 MCC |
292 | } |
293 | INIT_LIST_HEAD(&q->stream); | |
294 | } | |
7a02264c | 295 | EXPORT_SYMBOL_GPL(videobuf_queue_cancel); |
7a7d9a89 MCC |
296 | |
297 | /* --------------------------------------------------------------------- */ | |
298 | ||
64f9477f | 299 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
300 | enum v4l2_field videobuf_next_field(struct videobuf_queue *q) |
301 | { | |
302 | enum v4l2_field field = q->field; | |
303 | ||
304 | BUG_ON(V4L2_FIELD_ANY == field); | |
305 | ||
306 | if (V4L2_FIELD_ALTERNATE == field) { | |
307 | if (V4L2_FIELD_TOP == q->last) { | |
308 | field = V4L2_FIELD_BOTTOM; | |
309 | q->last = V4L2_FIELD_BOTTOM; | |
310 | } else { | |
311 | field = V4L2_FIELD_TOP; | |
312 | q->last = V4L2_FIELD_TOP; | |
313 | } | |
314 | } | |
315 | return field; | |
316 | } | |
7a02264c | 317 | EXPORT_SYMBOL_GPL(videobuf_next_field); |
7a7d9a89 | 318 | |
64f9477f | 319 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
320 | static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b, |
321 | struct videobuf_buffer *vb, enum v4l2_buf_type type) | |
322 | { | |
e2c77314 MCC |
323 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
324 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
7a7d9a89 MCC |
325 | |
326 | b->index = vb->i; | |
327 | b->type = type; | |
328 | ||
329 | b->memory = vb->memory; | |
330 | switch (b->memory) { | |
331 | case V4L2_MEMORY_MMAP: | |
332 | b->m.offset = vb->boff; | |
333 | b->length = vb->bsize; | |
334 | break; | |
335 | case V4L2_MEMORY_USERPTR: | |
336 | b->m.userptr = vb->baddr; | |
337 | b->length = vb->bsize; | |
338 | break; | |
339 | case V4L2_MEMORY_OVERLAY: | |
340 | b->m.offset = vb->boff; | |
341 | break; | |
3c3016ba SS |
342 | case V4L2_MEMORY_DMABUF: |
343 | /* DMABUF is not handled in videobuf framework */ | |
344 | break; | |
7a7d9a89 MCC |
345 | } |
346 | ||
1b18e7a0 | 347 | b->flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; |
851c0c96 | 348 | if (vb->map) |
7a7d9a89 MCC |
349 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
350 | ||
351 | switch (vb->state) { | |
0fc0686e BP |
352 | case VIDEOBUF_PREPARED: |
353 | case VIDEOBUF_QUEUED: | |
354 | case VIDEOBUF_ACTIVE: | |
7a7d9a89 MCC |
355 | b->flags |= V4L2_BUF_FLAG_QUEUED; |
356 | break; | |
0fc0686e | 357 | case VIDEOBUF_ERROR: |
b2dfd1a4 HV |
358 | b->flags |= V4L2_BUF_FLAG_ERROR; |
359 | /* fall through */ | |
360 | case VIDEOBUF_DONE: | |
7a7d9a89 MCC |
361 | b->flags |= V4L2_BUF_FLAG_DONE; |
362 | break; | |
0fc0686e BP |
363 | case VIDEOBUF_NEEDS_INIT: |
364 | case VIDEOBUF_IDLE: | |
7a7d9a89 MCC |
365 | /* nothing */ |
366 | break; | |
367 | } | |
368 | ||
7a7d9a89 MCC |
369 | b->field = vb->field; |
370 | b->timestamp = vb->ts; | |
371 | b->bytesused = vb->size; | |
372 | b->sequence = vb->field_count >> 1; | |
373 | } | |
374 | ||
19bc5133 BP |
375 | int videobuf_mmap_free(struct videobuf_queue *q) |
376 | { | |
377 | int ret; | |
97397687 | 378 | videobuf_queue_lock(q); |
a438d6da | 379 | ret = __videobuf_free(q); |
97397687 | 380 | videobuf_queue_unlock(q); |
19bc5133 BP |
381 | return ret; |
382 | } | |
7a02264c | 383 | EXPORT_SYMBOL_GPL(videobuf_mmap_free); |
19bc5133 | 384 | |
64f9477f | 385 | /* Locking: Caller holds q->vb_lock */ |
81b2dbca | 386 | int __videobuf_mmap_setup(struct videobuf_queue *q, |
19bc5133 BP |
387 | unsigned int bcount, unsigned int bsize, |
388 | enum v4l2_memory memory) | |
389 | { | |
390 | unsigned int i; | |
391 | int err; | |
392 | ||
e2c77314 | 393 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
19bc5133 | 394 | |
a438d6da | 395 | err = __videobuf_free(q); |
19bc5133 BP |
396 | if (0 != err) |
397 | return err; | |
398 | ||
399 | /* Allocate and initialize buffers */ | |
400 | for (i = 0; i < bcount; i++) { | |
33c38283 | 401 | q->bufs[i] = videobuf_alloc_vb(q); |
19bc5133 | 402 | |
7a02264c | 403 | if (NULL == q->bufs[i]) |
19bc5133 BP |
404 | break; |
405 | ||
406 | q->bufs[i]->i = i; | |
19bc5133 BP |
407 | q->bufs[i]->memory = memory; |
408 | q->bufs[i]->bsize = bsize; | |
409 | switch (memory) { | |
410 | case V4L2_MEMORY_MMAP: | |
7cbefad0 | 411 | q->bufs[i]->boff = PAGE_ALIGN(bsize) * i; |
19bc5133 BP |
412 | break; |
413 | case V4L2_MEMORY_USERPTR: | |
414 | case V4L2_MEMORY_OVERLAY: | |
3c3016ba | 415 | case V4L2_MEMORY_DMABUF: |
19bc5133 BP |
416 | /* nothing */ |
417 | break; | |
418 | } | |
419 | } | |
420 | ||
421 | if (!i) | |
422 | return -ENOMEM; | |
423 | ||
7a02264c | 424 | dprintk(1, "mmap setup: %d buffers, %d bytes each\n", i, bsize); |
19bc5133 BP |
425 | |
426 | return i; | |
427 | } | |
7a02264c | 428 | EXPORT_SYMBOL_GPL(__videobuf_mmap_setup); |
19bc5133 BP |
429 | |
430 | int videobuf_mmap_setup(struct videobuf_queue *q, | |
431 | unsigned int bcount, unsigned int bsize, | |
432 | enum v4l2_memory memory) | |
433 | { | |
434 | int ret; | |
97397687 | 435 | videobuf_queue_lock(q); |
19bc5133 | 436 | ret = __videobuf_mmap_setup(q, bcount, bsize, memory); |
97397687 | 437 | videobuf_queue_unlock(q); |
19bc5133 BP |
438 | return ret; |
439 | } | |
7a02264c | 440 | EXPORT_SYMBOL_GPL(videobuf_mmap_setup); |
19bc5133 | 441 | |
7a7d9a89 MCC |
442 | int videobuf_reqbufs(struct videobuf_queue *q, |
443 | struct v4l2_requestbuffers *req) | |
444 | { | |
e2c77314 | 445 | unsigned int size, count; |
7a7d9a89 MCC |
446 | int retval; |
447 | ||
7a7d9a89 MCC |
448 | if (req->memory != V4L2_MEMORY_MMAP && |
449 | req->memory != V4L2_MEMORY_USERPTR && | |
450 | req->memory != V4L2_MEMORY_OVERLAY) { | |
e2c77314 | 451 | dprintk(1, "reqbufs: memory type invalid\n"); |
7a7d9a89 MCC |
452 | return -EINVAL; |
453 | } | |
454 | ||
97397687 | 455 | videobuf_queue_lock(q); |
19bc5133 | 456 | if (req->type != q->type) { |
e2c77314 | 457 | dprintk(1, "reqbufs: queue type invalid\n"); |
19bc5133 BP |
458 | retval = -EINVAL; |
459 | goto done; | |
460 | } | |
461 | ||
7a7d9a89 | 462 | if (q->streaming) { |
e2c77314 | 463 | dprintk(1, "reqbufs: streaming already exists\n"); |
00f98d08 BP |
464 | retval = -EBUSY; |
465 | goto done; | |
7a7d9a89 MCC |
466 | } |
467 | if (!list_empty(&q->stream)) { | |
e2c77314 | 468 | dprintk(1, "reqbufs: stream running\n"); |
00f98d08 BP |
469 | retval = -EBUSY; |
470 | goto done; | |
7a7d9a89 MCC |
471 | } |
472 | ||
b7900eed HG |
473 | if (req->count == 0) { |
474 | dprintk(1, "reqbufs: count invalid (%d)\n", req->count); | |
475 | retval = __videobuf_free(q); | |
476 | goto done; | |
477 | } | |
478 | ||
7a7d9a89 MCC |
479 | count = req->count; |
480 | if (count > VIDEO_MAX_FRAME) | |
481 | count = VIDEO_MAX_FRAME; | |
482 | size = 0; | |
e2c77314 | 483 | q->ops->buf_setup(q, &count, &size); |
296372e3 MN |
484 | dprintk(1, "reqbufs: bufs=%d, size=0x%x [%u pages total]\n", |
485 | count, size, | |
7a02264c | 486 | (unsigned int)((count * PAGE_ALIGN(size)) >> PAGE_SHIFT)); |
7a7d9a89 | 487 | |
e2c77314 | 488 | retval = __videobuf_mmap_setup(q, count, size, req->memory); |
7a7d9a89 | 489 | if (retval < 0) { |
e2c77314 | 490 | dprintk(1, "reqbufs: mmap setup returned %d\n", retval); |
7a7d9a89 MCC |
491 | goto done; |
492 | } | |
493 | ||
49ee718e | 494 | req->count = retval; |
925d74ae | 495 | retval = 0; |
7a7d9a89 MCC |
496 | |
497 | done: | |
97397687 | 498 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
499 | return retval; |
500 | } | |
7a02264c | 501 | EXPORT_SYMBOL_GPL(videobuf_reqbufs); |
7a7d9a89 MCC |
502 | |
503 | int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b) | |
504 | { | |
19bc5133 BP |
505 | int ret = -EINVAL; |
506 | ||
97397687 | 507 | videobuf_queue_lock(q); |
7a7d9a89 | 508 | if (unlikely(b->type != q->type)) { |
e2c77314 | 509 | dprintk(1, "querybuf: Wrong type.\n"); |
19bc5133 | 510 | goto done; |
7a7d9a89 | 511 | } |
223ffe5f | 512 | if (unlikely(b->index >= VIDEO_MAX_FRAME)) { |
e2c77314 | 513 | dprintk(1, "querybuf: index out of range.\n"); |
19bc5133 | 514 | goto done; |
7a7d9a89 MCC |
515 | } |
516 | if (unlikely(NULL == q->bufs[b->index])) { | |
e2c77314 | 517 | dprintk(1, "querybuf: buffer is null.\n"); |
19bc5133 | 518 | goto done; |
7a7d9a89 | 519 | } |
19bc5133 | 520 | |
e2c77314 | 521 | videobuf_status(q, b, q->bufs[b->index], q->type); |
19bc5133 BP |
522 | |
523 | ret = 0; | |
524 | done: | |
97397687 | 525 | videobuf_queue_unlock(q); |
19bc5133 | 526 | return ret; |
7a7d9a89 | 527 | } |
7a02264c | 528 | EXPORT_SYMBOL_GPL(videobuf_querybuf); |
7a7d9a89 | 529 | |
7a02264c | 530 | int videobuf_qbuf(struct videobuf_queue *q, struct v4l2_buffer *b) |
7a7d9a89 MCC |
531 | { |
532 | struct videobuf_buffer *buf; | |
533 | enum v4l2_field field; | |
e2c77314 | 534 | unsigned long flags = 0; |
7a7d9a89 MCC |
535 | int retval; |
536 | ||
e2c77314 | 537 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 538 | |
9900132f ML |
539 | if (b->memory == V4L2_MEMORY_MMAP) |
540 | down_read(¤t->mm->mmap_sem); | |
541 | ||
97397687 | 542 | videobuf_queue_lock(q); |
7a7d9a89 MCC |
543 | retval = -EBUSY; |
544 | if (q->reading) { | |
e2c77314 | 545 | dprintk(1, "qbuf: Reading running...\n"); |
7a7d9a89 MCC |
546 | goto done; |
547 | } | |
548 | retval = -EINVAL; | |
549 | if (b->type != q->type) { | |
e2c77314 | 550 | dprintk(1, "qbuf: Wrong type.\n"); |
7a7d9a89 MCC |
551 | goto done; |
552 | } | |
223ffe5f | 553 | if (b->index >= VIDEO_MAX_FRAME) { |
e2c77314 | 554 | dprintk(1, "qbuf: index out of range.\n"); |
7a7d9a89 MCC |
555 | goto done; |
556 | } | |
557 | buf = q->bufs[b->index]; | |
558 | if (NULL == buf) { | |
e2c77314 | 559 | dprintk(1, "qbuf: buffer is null.\n"); |
7a7d9a89 MCC |
560 | goto done; |
561 | } | |
e2c77314 | 562 | MAGIC_CHECK(buf->magic, MAGIC_BUFFER); |
7a7d9a89 | 563 | if (buf->memory != b->memory) { |
e2c77314 | 564 | dprintk(1, "qbuf: memory type is wrong.\n"); |
7a7d9a89 MCC |
565 | goto done; |
566 | } | |
0fc0686e | 567 | if (buf->state != VIDEOBUF_NEEDS_INIT && buf->state != VIDEOBUF_IDLE) { |
e2c77314 | 568 | dprintk(1, "qbuf: buffer is already queued or active.\n"); |
7a7d9a89 MCC |
569 | goto done; |
570 | } | |
571 | ||
7a7d9a89 MCC |
572 | switch (b->memory) { |
573 | case V4L2_MEMORY_MMAP: | |
574 | if (0 == buf->baddr) { | |
e2c77314 MCC |
575 | dprintk(1, "qbuf: mmap requested " |
576 | "but buffer addr is zero!\n"); | |
7a7d9a89 MCC |
577 | goto done; |
578 | } | |
96f2ec67 PO |
579 | if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT |
580 | || q->type == V4L2_BUF_TYPE_VBI_OUTPUT | |
9effc72f AP |
581 | || q->type == V4L2_BUF_TYPE_SLICED_VBI_OUTPUT |
582 | || q->type == V4L2_BUF_TYPE_SDR_OUTPUT) { | |
96f2ec67 PO |
583 | buf->size = b->bytesused; |
584 | buf->field = b->field; | |
585 | buf->ts = b->timestamp; | |
586 | } | |
7a7d9a89 MCC |
587 | break; |
588 | case V4L2_MEMORY_USERPTR: | |
589 | if (b->length < buf->bsize) { | |
e2c77314 | 590 | dprintk(1, "qbuf: buffer length is not enough\n"); |
7a7d9a89 MCC |
591 | goto done; |
592 | } | |
e2c77314 MCC |
593 | if (VIDEOBUF_NEEDS_INIT != buf->state && |
594 | buf->baddr != b->m.userptr) | |
595 | q->ops->buf_release(q, buf); | |
7a7d9a89 MCC |
596 | buf->baddr = b->m.userptr; |
597 | break; | |
598 | case V4L2_MEMORY_OVERLAY: | |
599 | buf->boff = b->m.offset; | |
600 | break; | |
601 | default: | |
e2c77314 | 602 | dprintk(1, "qbuf: wrong memory type\n"); |
7a7d9a89 MCC |
603 | goto done; |
604 | } | |
605 | ||
e2c77314 | 606 | dprintk(1, "qbuf: requesting next field\n"); |
7a7d9a89 | 607 | field = videobuf_next_field(q); |
e2c77314 | 608 | retval = q->ops->buf_prepare(q, buf, field); |
7a7d9a89 | 609 | if (0 != retval) { |
e2c77314 | 610 | dprintk(1, "qbuf: buffer_prepare returned %d\n", retval); |
7a7d9a89 MCC |
611 | goto done; |
612 | } | |
613 | ||
e2c77314 | 614 | list_add_tail(&buf->stream, &q->stream); |
7a7d9a89 | 615 | if (q->streaming) { |
0cf4daee | 616 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 617 | q->ops->buf_queue(q, buf); |
0cf4daee | 618 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 | 619 | } |
771075bb | 620 | dprintk(1, "qbuf: succeeded\n"); |
7a7d9a89 | 621 | retval = 0; |
137d1cb1 | 622 | wake_up_interruptible_sync(&q->wait); |
7a7d9a89 | 623 | |
7a02264c | 624 | done: |
97397687 | 625 | videobuf_queue_unlock(q); |
9900132f ML |
626 | |
627 | if (b->memory == V4L2_MEMORY_MMAP) | |
628 | up_read(¤t->mm->mmap_sem); | |
629 | ||
7a7d9a89 MCC |
630 | return retval; |
631 | } | |
7a02264c | 632 | EXPORT_SYMBOL_GPL(videobuf_qbuf); |
137d1cb1 BP |
633 | |
634 | /* Locking: Caller holds q->vb_lock */ | |
635 | static int stream_next_buffer_check_queue(struct videobuf_queue *q, int noblock) | |
7a7d9a89 | 636 | { |
7a7d9a89 MCC |
637 | int retval; |
638 | ||
137d1cb1 BP |
639 | checks: |
640 | if (!q->streaming) { | |
641 | dprintk(1, "next_buffer: Not streaming\n"); | |
642 | retval = -EINVAL; | |
7a7d9a89 MCC |
643 | goto done; |
644 | } | |
137d1cb1 | 645 | |
7a7d9a89 | 646 | if (list_empty(&q->stream)) { |
137d1cb1 BP |
647 | if (noblock) { |
648 | retval = -EAGAIN; | |
649 | dprintk(2, "next_buffer: no buffers to dequeue\n"); | |
650 | goto done; | |
651 | } else { | |
652 | dprintk(2, "next_buffer: waiting on buffer\n"); | |
653 | ||
654 | /* Drop lock to avoid deadlock with qbuf */ | |
97397687 | 655 | videobuf_queue_unlock(q); |
137d1cb1 BP |
656 | |
657 | /* Checking list_empty and streaming is safe without | |
658 | * locks because we goto checks to validate while | |
659 | * holding locks before proceeding */ | |
660 | retval = wait_event_interruptible(q->wait, | |
661 | !list_empty(&q->stream) || !q->streaming); | |
97397687 | 662 | videobuf_queue_lock(q); |
137d1cb1 BP |
663 | |
664 | if (retval) | |
665 | goto done; | |
666 | ||
667 | goto checks; | |
668 | } | |
7a7d9a89 | 669 | } |
137d1cb1 BP |
670 | |
671 | retval = 0; | |
672 | ||
673 | done: | |
674 | return retval; | |
675 | } | |
676 | ||
137d1cb1 BP |
677 | /* Locking: Caller holds q->vb_lock */ |
678 | static int stream_next_buffer(struct videobuf_queue *q, | |
679 | struct videobuf_buffer **vb, int nonblocking) | |
680 | { | |
681 | int retval; | |
682 | struct videobuf_buffer *buf = NULL; | |
683 | ||
684 | retval = stream_next_buffer_check_queue(q, nonblocking); | |
685 | if (retval) | |
686 | goto done; | |
687 | ||
7a7d9a89 | 688 | buf = list_entry(q->stream.next, struct videobuf_buffer, stream); |
0e0809a5 | 689 | retval = videobuf_waiton(q, buf, nonblocking, 1); |
137d1cb1 BP |
690 | if (retval < 0) |
691 | goto done; | |
692 | ||
693 | *vb = buf; | |
694 | done: | |
695 | return retval; | |
696 | } | |
697 | ||
698 | int videobuf_dqbuf(struct videobuf_queue *q, | |
7a02264c | 699 | struct v4l2_buffer *b, int nonblocking) |
137d1cb1 BP |
700 | { |
701 | struct videobuf_buffer *buf = NULL; | |
702 | int retval; | |
703 | ||
704 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
705 | ||
b2dfd1a4 | 706 | memset(b, 0, sizeof(*b)); |
97397687 | 707 | videobuf_queue_lock(q); |
137d1cb1 BP |
708 | |
709 | retval = stream_next_buffer(q, &buf, nonblocking); | |
7a7d9a89 | 710 | if (retval < 0) { |
137d1cb1 | 711 | dprintk(1, "dqbuf: next_buffer error: %i\n", retval); |
7a7d9a89 MCC |
712 | goto done; |
713 | } | |
137d1cb1 | 714 | |
7a7d9a89 | 715 | switch (buf->state) { |
0fc0686e | 716 | case VIDEOBUF_ERROR: |
e2c77314 | 717 | dprintk(1, "dqbuf: state is error\n"); |
7a7d9a89 | 718 | break; |
0fc0686e | 719 | case VIDEOBUF_DONE: |
e2c77314 | 720 | dprintk(1, "dqbuf: state is done\n"); |
7a7d9a89 MCC |
721 | break; |
722 | default: | |
e2c77314 | 723 | dprintk(1, "dqbuf: state invalid\n"); |
7a7d9a89 MCC |
724 | retval = -EINVAL; |
725 | goto done; | |
726 | } | |
b2dfd1a4 | 727 | CALL(q, sync, q, buf); |
e2c77314 | 728 | videobuf_status(q, b, buf, q->type); |
b2dfd1a4 HV |
729 | list_del(&buf->stream); |
730 | buf->state = VIDEOBUF_IDLE; | |
731 | b->flags &= ~V4L2_BUF_FLAG_DONE; | |
7a02264c | 732 | done: |
97397687 | 733 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
734 | return retval; |
735 | } | |
7a02264c | 736 | EXPORT_SYMBOL_GPL(videobuf_dqbuf); |
7a7d9a89 MCC |
737 | |
738 | int videobuf_streamon(struct videobuf_queue *q) | |
739 | { | |
740 | struct videobuf_buffer *buf; | |
e2c77314 | 741 | unsigned long flags = 0; |
7a7d9a89 MCC |
742 | int retval; |
743 | ||
97397687 | 744 | videobuf_queue_lock(q); |
7a7d9a89 MCC |
745 | retval = -EBUSY; |
746 | if (q->reading) | |
747 | goto done; | |
748 | retval = 0; | |
749 | if (q->streaming) | |
750 | goto done; | |
751 | q->streaming = 1; | |
0cf4daee | 752 | spin_lock_irqsave(q->irqlock, flags); |
a991f44b | 753 | list_for_each_entry(buf, &q->stream, stream) |
0fc0686e | 754 | if (buf->state == VIDEOBUF_PREPARED) |
e2c77314 | 755 | q->ops->buf_queue(q, buf); |
0cf4daee | 756 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 | 757 | |
137d1cb1 | 758 | wake_up_interruptible_sync(&q->wait); |
7a02264c | 759 | done: |
97397687 | 760 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
761 | return retval; |
762 | } | |
7a02264c | 763 | EXPORT_SYMBOL_GPL(videobuf_streamon); |
7a7d9a89 | 764 | |
64f9477f | 765 | /* Locking: Caller holds q->vb_lock */ |
19bc5133 | 766 | static int __videobuf_streamoff(struct videobuf_queue *q) |
7a7d9a89 | 767 | { |
7a7d9a89 | 768 | if (!q->streaming) |
19bc5133 BP |
769 | return -EINVAL; |
770 | ||
7a7d9a89 | 771 | videobuf_queue_cancel(q); |
7a7d9a89 | 772 | |
19bc5133 BP |
773 | return 0; |
774 | } | |
775 | ||
776 | int videobuf_streamoff(struct videobuf_queue *q) | |
777 | { | |
778 | int retval; | |
779 | ||
97397687 | 780 | videobuf_queue_lock(q); |
19bc5133 | 781 | retval = __videobuf_streamoff(q); |
97397687 | 782 | videobuf_queue_unlock(q); |
19bc5133 | 783 | |
7a7d9a89 MCC |
784 | return retval; |
785 | } | |
7a02264c | 786 | EXPORT_SYMBOL_GPL(videobuf_streamoff); |
7a7d9a89 | 787 | |
64f9477f | 788 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
789 | static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q, |
790 | char __user *data, | |
791 | size_t count, loff_t *ppos) | |
792 | { | |
793 | enum v4l2_field field; | |
e2c77314 | 794 | unsigned long flags = 0; |
7a7d9a89 MCC |
795 | int retval; |
796 | ||
e2c77314 | 797 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 MCC |
798 | |
799 | /* setup stuff */ | |
33c38283 | 800 | q->read_buf = videobuf_alloc_vb(q); |
7a7d9a89 MCC |
801 | if (NULL == q->read_buf) |
802 | return -ENOMEM; | |
803 | ||
804 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
805 | q->read_buf->baddr = (unsigned long)data; | |
806 | q->read_buf->bsize = count; | |
807 | ||
808 | field = videobuf_next_field(q); | |
e2c77314 | 809 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
7a7d9a89 MCC |
810 | if (0 != retval) |
811 | goto done; | |
812 | ||
813 | /* start capture & wait */ | |
0cf4daee | 814 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 815 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee | 816 | spin_unlock_irqrestore(q->irqlock, flags); |
0e0809a5 | 817 | retval = videobuf_waiton(q, q->read_buf, 0, 0); |
7a7d9a89 | 818 | if (0 == retval) { |
e2c77314 | 819 | CALL(q, sync, q, q->read_buf); |
0fc0686e | 820 | if (VIDEOBUF_ERROR == q->read_buf->state) |
7a7d9a89 MCC |
821 | retval = -EIO; |
822 | else | |
823 | retval = q->read_buf->size; | |
824 | } | |
825 | ||
7a02264c | 826 | done: |
7a7d9a89 | 827 | /* cleanup */ |
e2c77314 | 828 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
829 | kfree(q->read_buf); |
830 | q->read_buf = NULL; | |
831 | return retval; | |
832 | } | |
833 | ||
37111039 HV |
834 | static int __videobuf_copy_to_user(struct videobuf_queue *q, |
835 | struct videobuf_buffer *buf, | |
836 | char __user *data, size_t count, | |
837 | int nonblocking) | |
838 | { | |
a8d54e4c | 839 | void *vaddr = CALLPTR(q, vaddr, buf); |
37111039 HV |
840 | |
841 | /* copy to userspace */ | |
842 | if (count > buf->size - q->read_off) | |
843 | count = buf->size - q->read_off; | |
844 | ||
845 | if (copy_to_user(data, vaddr + q->read_off, count)) | |
846 | return -EFAULT; | |
847 | ||
848 | return count; | |
849 | } | |
850 | ||
851 | static int __videobuf_copy_stream(struct videobuf_queue *q, | |
852 | struct videobuf_buffer *buf, | |
853 | char __user *data, size_t count, size_t pos, | |
854 | int vbihack, int nonblocking) | |
855 | { | |
a8d54e4c | 856 | unsigned int *fc = CALLPTR(q, vaddr, buf); |
37111039 HV |
857 | |
858 | if (vbihack) { | |
859 | /* dirty, undocumented hack -- pass the frame counter | |
860 | * within the last four bytes of each vbi data block. | |
861 | * We need that one to maintain backward compatibility | |
862 | * to all vbi decoding software out there ... */ | |
863 | fc += (buf->size >> 2) - 1; | |
864 | *fc = buf->field_count >> 1; | |
865 | dprintk(1, "vbihack: %d\n", *fc); | |
866 | } | |
867 | ||
868 | /* copy stuff using the common method */ | |
869 | count = __videobuf_copy_to_user(q, buf, data, count, nonblocking); | |
870 | ||
871 | if ((count == -EFAULT) && (pos == 0)) | |
872 | return -EFAULT; | |
873 | ||
874 | return count; | |
875 | } | |
876 | ||
7a7d9a89 MCC |
877 | ssize_t videobuf_read_one(struct videobuf_queue *q, |
878 | char __user *data, size_t count, loff_t *ppos, | |
879 | int nonblocking) | |
880 | { | |
881 | enum v4l2_field field; | |
e2c77314 | 882 | unsigned long flags = 0; |
7daa4a88 | 883 | unsigned size = 0, nbufs = 1; |
7a7d9a89 MCC |
884 | int retval; |
885 | ||
e2c77314 | 886 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 887 | |
97397687 | 888 | videobuf_queue_lock(q); |
7a7d9a89 | 889 | |
e2c77314 | 890 | q->ops->buf_setup(q, &nbufs, &size); |
7a7d9a89 MCC |
891 | |
892 | if (NULL == q->read_buf && | |
893 | count >= size && | |
894 | !nonblocking) { | |
e2c77314 | 895 | retval = videobuf_read_zerocopy(q, data, count, ppos); |
7a7d9a89 MCC |
896 | if (retval >= 0 || retval == -EIO) |
897 | /* ok, all done */ | |
898 | goto done; | |
899 | /* fallback to kernel bounce buffer on failures */ | |
900 | } | |
901 | ||
902 | if (NULL == q->read_buf) { | |
903 | /* need to capture a new frame */ | |
904 | retval = -ENOMEM; | |
33c38283 | 905 | q->read_buf = videobuf_alloc_vb(q); |
7a7d9a89 | 906 | |
e2c77314 | 907 | dprintk(1, "video alloc=0x%p\n", q->read_buf); |
7a7d9a89 MCC |
908 | if (NULL == q->read_buf) |
909 | goto done; | |
910 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
911 | q->read_buf->bsize = count; /* preferred size */ | |
912 | field = videobuf_next_field(q); | |
e2c77314 | 913 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
7a7d9a89 MCC |
914 | |
915 | if (0 != retval) { | |
e2c77314 | 916 | kfree(q->read_buf); |
7a7d9a89 MCC |
917 | q->read_buf = NULL; |
918 | goto done; | |
919 | } | |
7a7d9a89 | 920 | |
0cf4daee | 921 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 922 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee BP |
923 | spin_unlock_irqrestore(q->irqlock, flags); |
924 | ||
7a7d9a89 MCC |
925 | q->read_off = 0; |
926 | } | |
927 | ||
928 | /* wait until capture is done */ | |
0e0809a5 | 929 | retval = videobuf_waiton(q, q->read_buf, nonblocking, 1); |
7a7d9a89 MCC |
930 | if (0 != retval) |
931 | goto done; | |
932 | ||
e2c77314 | 933 | CALL(q, sync, q, q->read_buf); |
7a7d9a89 | 934 | |
0fc0686e | 935 | if (VIDEOBUF_ERROR == q->read_buf->state) { |
7a7d9a89 | 936 | /* catch I/O errors */ |
e2c77314 | 937 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
938 | kfree(q->read_buf); |
939 | q->read_buf = NULL; | |
940 | retval = -EIO; | |
941 | goto done; | |
942 | } | |
943 | ||
944 | /* Copy to userspace */ | |
37111039 | 945 | retval = __videobuf_copy_to_user(q, q->read_buf, data, count, nonblocking); |
e2c77314 | 946 | if (retval < 0) |
7a7d9a89 MCC |
947 | goto done; |
948 | ||
949 | q->read_off += retval; | |
950 | if (q->read_off == q->read_buf->size) { | |
951 | /* all data copied, cleanup */ | |
e2c77314 | 952 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
953 | kfree(q->read_buf); |
954 | q->read_buf = NULL; | |
955 | } | |
956 | ||
7a02264c | 957 | done: |
97397687 | 958 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
959 | return retval; |
960 | } | |
7a02264c | 961 | EXPORT_SYMBOL_GPL(videobuf_read_one); |
7a7d9a89 | 962 | |
64f9477f | 963 | /* Locking: Caller holds q->vb_lock */ |
225ba900 | 964 | static int __videobuf_read_start(struct videobuf_queue *q) |
7a7d9a89 MCC |
965 | { |
966 | enum v4l2_field field; | |
e2c77314 | 967 | unsigned long flags = 0; |
49ee718e | 968 | unsigned int count = 0, size = 0; |
7a7d9a89 MCC |
969 | int err, i; |
970 | ||
e2c77314 | 971 | q->ops->buf_setup(q, &count, &size); |
7a7d9a89 MCC |
972 | if (count < 2) |
973 | count = 2; | |
974 | if (count > VIDEO_MAX_FRAME) | |
975 | count = VIDEO_MAX_FRAME; | |
976 | size = PAGE_ALIGN(size); | |
977 | ||
19bc5133 | 978 | err = __videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR); |
49ee718e | 979 | if (err < 0) |
7a7d9a89 MCC |
980 | return err; |
981 | ||
49ee718e BP |
982 | count = err; |
983 | ||
7a7d9a89 MCC |
984 | for (i = 0; i < count; i++) { |
985 | field = videobuf_next_field(q); | |
e2c77314 | 986 | err = q->ops->buf_prepare(q, q->bufs[i], field); |
7a7d9a89 MCC |
987 | if (err) |
988 | return err; | |
989 | list_add_tail(&q->bufs[i]->stream, &q->stream); | |
990 | } | |
0cf4daee | 991 | spin_lock_irqsave(q->irqlock, flags); |
7a7d9a89 | 992 | for (i = 0; i < count; i++) |
e2c77314 | 993 | q->ops->buf_queue(q, q->bufs[i]); |
0cf4daee | 994 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
995 | q->reading = 1; |
996 | return 0; | |
997 | } | |
998 | ||
19bc5133 | 999 | static void __videobuf_read_stop(struct videobuf_queue *q) |
7a7d9a89 MCC |
1000 | { |
1001 | int i; | |
1002 | ||
1003 | videobuf_queue_cancel(q); | |
a438d6da | 1004 | __videobuf_free(q); |
7a7d9a89 MCC |
1005 | INIT_LIST_HEAD(&q->stream); |
1006 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
1007 | if (NULL == q->bufs[i]) | |
1008 | continue; | |
1009 | kfree(q->bufs[i]); | |
1010 | q->bufs[i] = NULL; | |
1011 | } | |
1012 | q->read_buf = NULL; | |
19bc5133 BP |
1013 | } |
1014 | ||
19fb1457 MCC |
1015 | int videobuf_read_start(struct videobuf_queue *q) |
1016 | { | |
1017 | int rc; | |
1018 | ||
97397687 | 1019 | videobuf_queue_lock(q); |
19fb1457 | 1020 | rc = __videobuf_read_start(q); |
97397687 | 1021 | videobuf_queue_unlock(q); |
19fb1457 MCC |
1022 | |
1023 | return rc; | |
1024 | } | |
7a02264c | 1025 | EXPORT_SYMBOL_GPL(videobuf_read_start); |
19fb1457 | 1026 | |
19bc5133 BP |
1027 | void videobuf_read_stop(struct videobuf_queue *q) |
1028 | { | |
97397687 | 1029 | videobuf_queue_lock(q); |
19bc5133 | 1030 | __videobuf_read_stop(q); |
97397687 | 1031 | videobuf_queue_unlock(q); |
19bc5133 | 1032 | } |
7a02264c | 1033 | EXPORT_SYMBOL_GPL(videobuf_read_stop); |
19bc5133 BP |
1034 | |
1035 | void videobuf_stop(struct videobuf_queue *q) | |
1036 | { | |
97397687 | 1037 | videobuf_queue_lock(q); |
19bc5133 BP |
1038 | |
1039 | if (q->streaming) | |
1040 | __videobuf_streamoff(q); | |
1041 | ||
1042 | if (q->reading) | |
1043 | __videobuf_read_stop(q); | |
1044 | ||
97397687 | 1045 | videobuf_queue_unlock(q); |
7a7d9a89 | 1046 | } |
7a02264c | 1047 | EXPORT_SYMBOL_GPL(videobuf_stop); |
19bc5133 | 1048 | |
7a7d9a89 MCC |
1049 | ssize_t videobuf_read_stream(struct videobuf_queue *q, |
1050 | char __user *data, size_t count, loff_t *ppos, | |
1051 | int vbihack, int nonblocking) | |
1052 | { | |
1053 | int rc, retval; | |
e2c77314 | 1054 | unsigned long flags = 0; |
7a7d9a89 | 1055 | |
e2c77314 | 1056 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1057 | |
7e28adb2 | 1058 | dprintk(2, "%s\n", __func__); |
97397687 | 1059 | videobuf_queue_lock(q); |
7a7d9a89 MCC |
1060 | retval = -EBUSY; |
1061 | if (q->streaming) | |
1062 | goto done; | |
1063 | if (!q->reading) { | |
3f84307a | 1064 | retval = __videobuf_read_start(q); |
7a7d9a89 MCC |
1065 | if (retval < 0) |
1066 | goto done; | |
1067 | } | |
1068 | ||
1069 | retval = 0; | |
1070 | while (count > 0) { | |
1071 | /* get / wait for data */ | |
1072 | if (NULL == q->read_buf) { | |
1073 | q->read_buf = list_entry(q->stream.next, | |
1074 | struct videobuf_buffer, | |
1075 | stream); | |
1076 | list_del(&q->read_buf->stream); | |
1077 | q->read_off = 0; | |
1078 | } | |
0e0809a5 | 1079 | rc = videobuf_waiton(q, q->read_buf, nonblocking, 1); |
7a7d9a89 MCC |
1080 | if (rc < 0) { |
1081 | if (0 == retval) | |
1082 | retval = rc; | |
1083 | break; | |
1084 | } | |
1085 | ||
0fc0686e | 1086 | if (q->read_buf->state == VIDEOBUF_DONE) { |
37111039 | 1087 | rc = __videobuf_copy_stream(q, q->read_buf, data + retval, count, |
7a7d9a89 MCC |
1088 | retval, vbihack, nonblocking); |
1089 | if (rc < 0) { | |
1090 | retval = rc; | |
1091 | break; | |
1092 | } | |
1093 | retval += rc; | |
1094 | count -= rc; | |
1095 | q->read_off += rc; | |
1096 | } else { | |
1097 | /* some error */ | |
1098 | q->read_off = q->read_buf->size; | |
1099 | if (0 == retval) | |
1100 | retval = -EIO; | |
1101 | } | |
1102 | ||
1103 | /* requeue buffer when done with copying */ | |
1104 | if (q->read_off == q->read_buf->size) { | |
1105 | list_add_tail(&q->read_buf->stream, | |
1106 | &q->stream); | |
0cf4daee | 1107 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 1108 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee | 1109 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
1110 | q->read_buf = NULL; |
1111 | } | |
1112 | if (retval < 0) | |
1113 | break; | |
1114 | } | |
1115 | ||
7a02264c | 1116 | done: |
97397687 | 1117 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
1118 | return retval; |
1119 | } | |
7a02264c | 1120 | EXPORT_SYMBOL_GPL(videobuf_read_stream); |
7a7d9a89 MCC |
1121 | |
1122 | unsigned int videobuf_poll_stream(struct file *file, | |
1123 | struct videobuf_queue *q, | |
1124 | poll_table *wait) | |
1125 | { | |
0e17e9a9 | 1126 | unsigned long req_events = poll_requested_events(wait); |
7a7d9a89 MCC |
1127 | struct videobuf_buffer *buf = NULL; |
1128 | unsigned int rc = 0; | |
1129 | ||
97397687 | 1130 | videobuf_queue_lock(q); |
7a7d9a89 MCC |
1131 | if (q->streaming) { |
1132 | if (!list_empty(&q->stream)) | |
1133 | buf = list_entry(q->stream.next, | |
1134 | struct videobuf_buffer, stream); | |
0e17e9a9 | 1135 | } else if (req_events & (POLLIN | POLLRDNORM)) { |
7a7d9a89 | 1136 | if (!q->reading) |
3f84307a | 1137 | __videobuf_read_start(q); |
7a7d9a89 MCC |
1138 | if (!q->reading) { |
1139 | rc = POLLERR; | |
1140 | } else if (NULL == q->read_buf) { | |
1141 | q->read_buf = list_entry(q->stream.next, | |
1142 | struct videobuf_buffer, | |
1143 | stream); | |
1144 | list_del(&q->read_buf->stream); | |
1145 | q->read_off = 0; | |
1146 | } | |
1147 | buf = q->read_buf; | |
1148 | } | |
1149 | if (!buf) | |
1150 | rc = POLLERR; | |
1151 | ||
1152 | if (0 == rc) { | |
1153 | poll_wait(file, &buf->done, wait); | |
0fc0686e | 1154 | if (buf->state == VIDEOBUF_DONE || |
9b558434 PO |
1155 | buf->state == VIDEOBUF_ERROR) { |
1156 | switch (q->type) { | |
1157 | case V4L2_BUF_TYPE_VIDEO_OUTPUT: | |
1158 | case V4L2_BUF_TYPE_VBI_OUTPUT: | |
1159 | case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT: | |
9effc72f | 1160 | case V4L2_BUF_TYPE_SDR_OUTPUT: |
9b558434 PO |
1161 | rc = POLLOUT | POLLWRNORM; |
1162 | break; | |
1163 | default: | |
1164 | rc = POLLIN | POLLRDNORM; | |
1165 | break; | |
1166 | } | |
1167 | } | |
7a7d9a89 | 1168 | } |
97397687 | 1169 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
1170 | return rc; |
1171 | } | |
7a02264c | 1172 | EXPORT_SYMBOL_GPL(videobuf_poll_stream); |
7a7d9a89 | 1173 | |
7a02264c | 1174 | int videobuf_mmap_mapper(struct videobuf_queue *q, struct vm_area_struct *vma) |
7a7d9a89 | 1175 | { |
0b62b737 HV |
1176 | int rc = -EINVAL; |
1177 | int i; | |
7a7d9a89 | 1178 | |
e2c77314 | 1179 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1180 | |
0b62b737 HV |
1181 | if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED)) { |
1182 | dprintk(1, "mmap appl bug: PROT_WRITE and MAP_SHARED are required\n"); | |
1183 | return -EINVAL; | |
1184 | } | |
1185 | ||
97397687 | 1186 | videobuf_queue_lock(q); |
0b62b737 HV |
1187 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
1188 | struct videobuf_buffer *buf = q->bufs[i]; | |
1189 | ||
1190 | if (buf && buf->memory == V4L2_MEMORY_MMAP && | |
1191 | buf->boff == (vma->vm_pgoff << PAGE_SHIFT)) { | |
1192 | rc = CALL(q, mmap_mapper, q, buf, vma); | |
1193 | break; | |
1194 | } | |
1195 | } | |
97397687 | 1196 | videobuf_queue_unlock(q); |
7a7d9a89 | 1197 | |
0b62b737 | 1198 | return rc; |
7a7d9a89 | 1199 | } |
7a02264c | 1200 | EXPORT_SYMBOL_GPL(videobuf_mmap_mapper); |