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 | |
33c38283 | 55 | struct videobuf_buffer *videobuf_alloc_vb(struct videobuf_queue *q) |
7a7d9a89 MCC |
56 | { |
57 | struct videobuf_buffer *vb; | |
58 | ||
e2c77314 | 59 | BUG_ON(q->msize < sizeof(*vb)); |
7a7d9a89 | 60 | |
33c38283 | 61 | if (!q->int_ops || !q->int_ops->alloc_vb) { |
7a7d9a89 MCC |
62 | printk(KERN_ERR "No specific ops defined!\n"); |
63 | BUG(); | |
64 | } | |
65 | ||
33c38283 | 66 | vb = q->int_ops->alloc_vb(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 | } | |
33c38283 | 74 | EXPORT_SYMBOL_GPL(videobuf_alloc_vb); |
7a7d9a89 | 75 | |
0e0809a5 | 76 | static int is_state_active_or_queued(struct videobuf_queue *q, struct videobuf_buffer *vb) |
7a7d9a89 | 77 | { |
0e0809a5 HV |
78 | unsigned long flags; |
79 | bool rc; | |
80 | ||
81 | spin_lock_irqsave(q->irqlock, flags); | |
82 | rc = vb->state != VIDEOBUF_ACTIVE && vb->state != VIDEOBUF_QUEUED; | |
83 | spin_unlock_irqrestore(q->irqlock, flags); | |
84 | return rc; | |
85 | }; | |
86 | ||
87 | int videobuf_waiton(struct videobuf_queue *q, struct videobuf_buffer *vb, | |
88 | int non_blocking, int intr) | |
89 | { | |
90 | bool is_ext_locked; | |
91 | int ret = 0; | |
92 | ||
e2c77314 | 93 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
009a9059 BP |
94 | |
95 | if (non_blocking) { | |
0e0809a5 | 96 | if (is_state_active_or_queued(q, vb)) |
009a9059 | 97 | return 0; |
0e0809a5 | 98 | return -EAGAIN; |
7a7d9a89 | 99 | } |
009a9059 | 100 | |
0e0809a5 HV |
101 | is_ext_locked = q->ext_lock && mutex_is_locked(q->ext_lock); |
102 | ||
103 | /* Release vdev lock to prevent this wait from blocking outside access to | |
104 | the device. */ | |
105 | if (is_ext_locked) | |
106 | mutex_unlock(q->ext_lock); | |
009a9059 | 107 | if (intr) |
0e0809a5 | 108 | ret = wait_event_interruptible(vb->done, is_state_active_or_queued(q, vb)); |
009a9059 | 109 | else |
0e0809a5 HV |
110 | wait_event(vb->done, is_state_active_or_queued(q, vb)); |
111 | /* Relock */ | |
112 | if (is_ext_locked) | |
113 | mutex_lock(q->ext_lock); | |
009a9059 | 114 | |
0e0809a5 | 115 | return ret; |
7a7d9a89 | 116 | } |
7a02264c | 117 | EXPORT_SYMBOL_GPL(videobuf_waiton); |
7a7d9a89 | 118 | |
e2c77314 | 119 | int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb, |
7a7d9a89 MCC |
120 | struct v4l2_framebuffer *fbuf) |
121 | { | |
e2c77314 MCC |
122 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
123 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
7a7d9a89 | 124 | |
e2c77314 | 125 | return CALL(q, iolock, q, vb, fbuf); |
7a7d9a89 | 126 | } |
7a02264c | 127 | EXPORT_SYMBOL_GPL(videobuf_iolock); |
7a7d9a89 | 128 | |
f4fce60e HV |
129 | void *videobuf_queue_to_vaddr(struct videobuf_queue *q, |
130 | struct videobuf_buffer *buf) | |
59d34489 | 131 | { |
037c75eb HV |
132 | if (q->int_ops->vaddr) |
133 | return q->int_ops->vaddr(buf); | |
f4fce60e | 134 | return NULL; |
59d34489 | 135 | } |
f4fce60e | 136 | EXPORT_SYMBOL_GPL(videobuf_queue_to_vaddr); |
59d34489 | 137 | |
7a7d9a89 MCC |
138 | /* --------------------------------------------------------------------- */ |
139 | ||
140 | ||
e2c77314 | 141 | void videobuf_queue_core_init(struct videobuf_queue *q, |
38a54f35 | 142 | const struct videobuf_queue_ops *ops, |
e9bcf667 | 143 | struct device *dev, |
7a7d9a89 MCC |
144 | spinlock_t *irqlock, |
145 | enum v4l2_buf_type type, | |
146 | enum v4l2_field field, | |
147 | unsigned int msize, | |
d4cae5a5 | 148 | void *priv, |
08bff03e HV |
149 | struct videobuf_qtype_ops *int_ops, |
150 | struct mutex *ext_lock) | |
7a7d9a89 | 151 | { |
96ceea27 | 152 | BUG_ON(!q); |
e2c77314 | 153 | memset(q, 0, sizeof(*q)); |
d4cae5a5 | 154 | q->irqlock = irqlock; |
08bff03e | 155 | q->ext_lock = ext_lock; |
d4cae5a5 MCC |
156 | q->dev = dev; |
157 | q->type = type; | |
158 | q->field = field; | |
159 | q->msize = msize; | |
160 | q->ops = ops; | |
7a7d9a89 | 161 | q->priv_data = priv; |
d4cae5a5 | 162 | q->int_ops = int_ops; |
7a7d9a89 MCC |
163 | |
164 | /* All buffer operations are mandatory */ | |
e2c77314 MCC |
165 | BUG_ON(!q->ops->buf_setup); |
166 | BUG_ON(!q->ops->buf_prepare); | |
167 | BUG_ON(!q->ops->buf_queue); | |
168 | BUG_ON(!q->ops->buf_release); | |
7a7d9a89 | 169 | |
0cf4daee BP |
170 | /* Lock is mandatory for queue_cancel to work */ |
171 | BUG_ON(!irqlock); | |
172 | ||
d4cae5a5 | 173 | /* Having implementations for abstract methods are mandatory */ |
e2c77314 | 174 | BUG_ON(!q->int_ops); |
d4cae5a5 | 175 | |
64f9477f | 176 | mutex_init(&q->vb_lock); |
137d1cb1 | 177 | init_waitqueue_head(&q->wait); |
7a7d9a89 MCC |
178 | INIT_LIST_HEAD(&q->stream); |
179 | } | |
7a02264c | 180 | EXPORT_SYMBOL_GPL(videobuf_queue_core_init); |
7a7d9a89 | 181 | |
19bc5133 | 182 | /* Locking: Only usage in bttv unsafe find way to remove */ |
7a7d9a89 MCC |
183 | int videobuf_queue_is_busy(struct videobuf_queue *q) |
184 | { | |
185 | int i; | |
186 | ||
e2c77314 | 187 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 MCC |
188 | |
189 | if (q->streaming) { | |
e2c77314 | 190 | dprintk(1, "busy: streaming active\n"); |
7a7d9a89 MCC |
191 | return 1; |
192 | } | |
193 | if (q->reading) { | |
e2c77314 | 194 | dprintk(1, "busy: pending read #1\n"); |
7a7d9a89 MCC |
195 | return 1; |
196 | } | |
197 | if (q->read_buf) { | |
e2c77314 | 198 | dprintk(1, "busy: pending read #2\n"); |
7a7d9a89 MCC |
199 | return 1; |
200 | } | |
201 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
202 | if (NULL == q->bufs[i]) | |
203 | continue; | |
851c0c96 | 204 | if (q->bufs[i]->map) { |
e2c77314 | 205 | dprintk(1, "busy: buffer #%d mapped\n", i); |
7a7d9a89 MCC |
206 | return 1; |
207 | } | |
0fc0686e | 208 | if (q->bufs[i]->state == VIDEOBUF_QUEUED) { |
e2c77314 | 209 | dprintk(1, "busy: buffer #%d queued\n", i); |
7a7d9a89 MCC |
210 | return 1; |
211 | } | |
0fc0686e | 212 | if (q->bufs[i]->state == VIDEOBUF_ACTIVE) { |
e2c77314 | 213 | dprintk(1, "busy: buffer #%d avtive\n", i); |
7a7d9a89 MCC |
214 | return 1; |
215 | } | |
216 | } | |
217 | return 0; | |
218 | } | |
7a02264c | 219 | EXPORT_SYMBOL_GPL(videobuf_queue_is_busy); |
7a7d9a89 | 220 | |
a438d6da PO |
221 | /** |
222 | * __videobuf_free() - free all the buffers and their control structures | |
223 | * | |
224 | * This function can only be called if streaming/reading is off, i.e. no buffers | |
225 | * are under control of the driver. | |
226 | */ | |
227 | /* Locking: Caller holds q->vb_lock */ | |
228 | static int __videobuf_free(struct videobuf_queue *q) | |
229 | { | |
230 | int i; | |
231 | ||
232 | dprintk(1, "%s\n", __func__); | |
233 | if (!q) | |
234 | return 0; | |
235 | ||
236 | if (q->streaming || q->reading) { | |
237 | dprintk(1, "Cannot free buffers when streaming or reading\n"); | |
238 | return -EBUSY; | |
239 | } | |
240 | ||
241 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
242 | ||
243 | for (i = 0; i < VIDEO_MAX_FRAME; i++) | |
244 | if (q->bufs[i] && q->bufs[i]->map) { | |
245 | dprintk(1, "Cannot free mmapped buffers\n"); | |
246 | return -EBUSY; | |
247 | } | |
248 | ||
249 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
250 | if (NULL == q->bufs[i]) | |
251 | continue; | |
252 | q->ops->buf_release(q, q->bufs[i]); | |
253 | kfree(q->bufs[i]); | |
254 | q->bufs[i] = NULL; | |
255 | } | |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
64f9477f | 260 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
261 | void videobuf_queue_cancel(struct videobuf_queue *q) |
262 | { | |
e2c77314 | 263 | unsigned long flags = 0; |
7a7d9a89 MCC |
264 | int i; |
265 | ||
137d1cb1 BP |
266 | q->streaming = 0; |
267 | q->reading = 0; | |
268 | wake_up_interruptible_sync(&q->wait); | |
269 | ||
7a7d9a89 | 270 | /* remove queued buffers from list */ |
0cf4daee | 271 | spin_lock_irqsave(q->irqlock, flags); |
7a7d9a89 MCC |
272 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
273 | if (NULL == q->bufs[i]) | |
274 | continue; | |
0fc0686e | 275 | if (q->bufs[i]->state == VIDEOBUF_QUEUED) { |
7a7d9a89 | 276 | list_del(&q->bufs[i]->queue); |
0fc0686e | 277 | q->bufs[i]->state = VIDEOBUF_ERROR; |
b608f432 | 278 | wake_up_all(&q->bufs[i]->done); |
7a7d9a89 MCC |
279 | } |
280 | } | |
0cf4daee | 281 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
282 | |
283 | /* free all buffers + clear queue */ | |
284 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
285 | if (NULL == q->bufs[i]) | |
286 | continue; | |
e2c77314 | 287 | q->ops->buf_release(q, q->bufs[i]); |
7a7d9a89 MCC |
288 | } |
289 | INIT_LIST_HEAD(&q->stream); | |
290 | } | |
7a02264c | 291 | EXPORT_SYMBOL_GPL(videobuf_queue_cancel); |
7a7d9a89 MCC |
292 | |
293 | /* --------------------------------------------------------------------- */ | |
294 | ||
64f9477f | 295 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
296 | enum v4l2_field videobuf_next_field(struct videobuf_queue *q) |
297 | { | |
298 | enum v4l2_field field = q->field; | |
299 | ||
300 | BUG_ON(V4L2_FIELD_ANY == field); | |
301 | ||
302 | if (V4L2_FIELD_ALTERNATE == field) { | |
303 | if (V4L2_FIELD_TOP == q->last) { | |
304 | field = V4L2_FIELD_BOTTOM; | |
305 | q->last = V4L2_FIELD_BOTTOM; | |
306 | } else { | |
307 | field = V4L2_FIELD_TOP; | |
308 | q->last = V4L2_FIELD_TOP; | |
309 | } | |
310 | } | |
311 | return field; | |
312 | } | |
7a02264c | 313 | EXPORT_SYMBOL_GPL(videobuf_next_field); |
7a7d9a89 | 314 | |
64f9477f | 315 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
316 | static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b, |
317 | struct videobuf_buffer *vb, enum v4l2_buf_type type) | |
318 | { | |
e2c77314 MCC |
319 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
320 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
7a7d9a89 MCC |
321 | |
322 | b->index = vb->i; | |
323 | b->type = type; | |
324 | ||
325 | b->memory = vb->memory; | |
326 | switch (b->memory) { | |
327 | case V4L2_MEMORY_MMAP: | |
328 | b->m.offset = vb->boff; | |
329 | b->length = vb->bsize; | |
330 | break; | |
331 | case V4L2_MEMORY_USERPTR: | |
332 | b->m.userptr = vb->baddr; | |
333 | b->length = vb->bsize; | |
334 | break; | |
335 | case V4L2_MEMORY_OVERLAY: | |
336 | b->m.offset = vb->boff; | |
337 | break; | |
338 | } | |
339 | ||
340 | b->flags = 0; | |
851c0c96 | 341 | if (vb->map) |
7a7d9a89 MCC |
342 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
343 | ||
344 | switch (vb->state) { | |
0fc0686e BP |
345 | case VIDEOBUF_PREPARED: |
346 | case VIDEOBUF_QUEUED: | |
347 | case VIDEOBUF_ACTIVE: | |
7a7d9a89 MCC |
348 | b->flags |= V4L2_BUF_FLAG_QUEUED; |
349 | break; | |
0fc0686e | 350 | case VIDEOBUF_ERROR: |
b2dfd1a4 HV |
351 | b->flags |= V4L2_BUF_FLAG_ERROR; |
352 | /* fall through */ | |
353 | case VIDEOBUF_DONE: | |
7a7d9a89 MCC |
354 | b->flags |= V4L2_BUF_FLAG_DONE; |
355 | break; | |
0fc0686e BP |
356 | case VIDEOBUF_NEEDS_INIT: |
357 | case VIDEOBUF_IDLE: | |
7a7d9a89 MCC |
358 | /* nothing */ |
359 | break; | |
360 | } | |
361 | ||
362 | if (vb->input != UNSET) { | |
363 | b->flags |= V4L2_BUF_FLAG_INPUT; | |
364 | b->input = vb->input; | |
365 | } | |
366 | ||
367 | b->field = vb->field; | |
368 | b->timestamp = vb->ts; | |
369 | b->bytesused = vb->size; | |
370 | b->sequence = vb->field_count >> 1; | |
371 | } | |
372 | ||
19bc5133 BP |
373 | int videobuf_mmap_free(struct videobuf_queue *q) |
374 | { | |
375 | int ret; | |
97397687 | 376 | videobuf_queue_lock(q); |
a438d6da | 377 | ret = __videobuf_free(q); |
97397687 | 378 | videobuf_queue_unlock(q); |
19bc5133 BP |
379 | return ret; |
380 | } | |
7a02264c | 381 | EXPORT_SYMBOL_GPL(videobuf_mmap_free); |
19bc5133 | 382 | |
64f9477f | 383 | /* Locking: Caller holds q->vb_lock */ |
81b2dbca | 384 | int __videobuf_mmap_setup(struct videobuf_queue *q, |
19bc5133 BP |
385 | unsigned int bcount, unsigned int bsize, |
386 | enum v4l2_memory memory) | |
387 | { | |
388 | unsigned int i; | |
389 | int err; | |
390 | ||
e2c77314 | 391 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
19bc5133 | 392 | |
a438d6da | 393 | err = __videobuf_free(q); |
19bc5133 BP |
394 | if (0 != err) |
395 | return err; | |
396 | ||
397 | /* Allocate and initialize buffers */ | |
398 | for (i = 0; i < bcount; i++) { | |
33c38283 | 399 | q->bufs[i] = videobuf_alloc_vb(q); |
19bc5133 | 400 | |
7a02264c | 401 | if (NULL == q->bufs[i]) |
19bc5133 BP |
402 | break; |
403 | ||
404 | q->bufs[i]->i = i; | |
405 | q->bufs[i]->input = UNSET; | |
406 | q->bufs[i]->memory = memory; | |
407 | q->bufs[i]->bsize = bsize; | |
408 | switch (memory) { | |
409 | case V4L2_MEMORY_MMAP: | |
7cbefad0 | 410 | q->bufs[i]->boff = PAGE_ALIGN(bsize) * i; |
19bc5133 BP |
411 | break; |
412 | case V4L2_MEMORY_USERPTR: | |
413 | case V4L2_MEMORY_OVERLAY: | |
414 | /* nothing */ | |
415 | break; | |
416 | } | |
417 | } | |
418 | ||
419 | if (!i) | |
420 | return -ENOMEM; | |
421 | ||
7a02264c | 422 | dprintk(1, "mmap setup: %d buffers, %d bytes each\n", i, bsize); |
19bc5133 BP |
423 | |
424 | return i; | |
425 | } | |
7a02264c | 426 | EXPORT_SYMBOL_GPL(__videobuf_mmap_setup); |
19bc5133 BP |
427 | |
428 | int videobuf_mmap_setup(struct videobuf_queue *q, | |
429 | unsigned int bcount, unsigned int bsize, | |
430 | enum v4l2_memory memory) | |
431 | { | |
432 | int ret; | |
97397687 | 433 | videobuf_queue_lock(q); |
19bc5133 | 434 | ret = __videobuf_mmap_setup(q, bcount, bsize, memory); |
97397687 | 435 | videobuf_queue_unlock(q); |
19bc5133 BP |
436 | return ret; |
437 | } | |
7a02264c | 438 | EXPORT_SYMBOL_GPL(videobuf_mmap_setup); |
19bc5133 | 439 | |
7a7d9a89 MCC |
440 | int videobuf_reqbufs(struct videobuf_queue *q, |
441 | struct v4l2_requestbuffers *req) | |
442 | { | |
e2c77314 | 443 | unsigned int size, count; |
7a7d9a89 MCC |
444 | int retval; |
445 | ||
7a7d9a89 | 446 | if (req->count < 1) { |
e2c77314 | 447 | dprintk(1, "reqbufs: count invalid (%d)\n", req->count); |
7a7d9a89 MCC |
448 | return -EINVAL; |
449 | } | |
19bc5133 | 450 | |
7a7d9a89 MCC |
451 | if (req->memory != V4L2_MEMORY_MMAP && |
452 | req->memory != V4L2_MEMORY_USERPTR && | |
453 | req->memory != V4L2_MEMORY_OVERLAY) { | |
e2c77314 | 454 | dprintk(1, "reqbufs: memory type invalid\n"); |
7a7d9a89 MCC |
455 | return -EINVAL; |
456 | } | |
457 | ||
97397687 | 458 | videobuf_queue_lock(q); |
19bc5133 | 459 | if (req->type != q->type) { |
e2c77314 | 460 | dprintk(1, "reqbufs: queue type invalid\n"); |
19bc5133 BP |
461 | retval = -EINVAL; |
462 | goto done; | |
463 | } | |
464 | ||
7a7d9a89 | 465 | if (q->streaming) { |
e2c77314 | 466 | dprintk(1, "reqbufs: streaming already exists\n"); |
00f98d08 BP |
467 | retval = -EBUSY; |
468 | goto done; | |
7a7d9a89 MCC |
469 | } |
470 | if (!list_empty(&q->stream)) { | |
e2c77314 | 471 | dprintk(1, "reqbufs: stream running\n"); |
00f98d08 BP |
472 | retval = -EBUSY; |
473 | goto done; | |
7a7d9a89 MCC |
474 | } |
475 | ||
7a7d9a89 MCC |
476 | count = req->count; |
477 | if (count > VIDEO_MAX_FRAME) | |
478 | count = VIDEO_MAX_FRAME; | |
479 | size = 0; | |
e2c77314 | 480 | q->ops->buf_setup(q, &count, &size); |
296372e3 MN |
481 | dprintk(1, "reqbufs: bufs=%d, size=0x%x [%u pages total]\n", |
482 | count, size, | |
7a02264c | 483 | (unsigned int)((count * PAGE_ALIGN(size)) >> PAGE_SHIFT)); |
7a7d9a89 | 484 | |
e2c77314 | 485 | retval = __videobuf_mmap_setup(q, count, size, req->memory); |
7a7d9a89 | 486 | if (retval < 0) { |
e2c77314 | 487 | dprintk(1, "reqbufs: mmap setup returned %d\n", retval); |
7a7d9a89 MCC |
488 | goto done; |
489 | } | |
490 | ||
49ee718e | 491 | req->count = retval; |
925d74ae | 492 | retval = 0; |
7a7d9a89 MCC |
493 | |
494 | done: | |
97397687 | 495 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
496 | return retval; |
497 | } | |
7a02264c | 498 | EXPORT_SYMBOL_GPL(videobuf_reqbufs); |
7a7d9a89 MCC |
499 | |
500 | int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b) | |
501 | { | |
19bc5133 BP |
502 | int ret = -EINVAL; |
503 | ||
97397687 | 504 | videobuf_queue_lock(q); |
7a7d9a89 | 505 | if (unlikely(b->type != q->type)) { |
e2c77314 | 506 | dprintk(1, "querybuf: Wrong type.\n"); |
19bc5133 | 507 | goto done; |
7a7d9a89 | 508 | } |
223ffe5f | 509 | if (unlikely(b->index >= VIDEO_MAX_FRAME)) { |
e2c77314 | 510 | dprintk(1, "querybuf: index out of range.\n"); |
19bc5133 | 511 | goto done; |
7a7d9a89 MCC |
512 | } |
513 | if (unlikely(NULL == q->bufs[b->index])) { | |
e2c77314 | 514 | dprintk(1, "querybuf: buffer is null.\n"); |
19bc5133 | 515 | goto done; |
7a7d9a89 | 516 | } |
19bc5133 | 517 | |
e2c77314 | 518 | videobuf_status(q, b, q->bufs[b->index], q->type); |
19bc5133 BP |
519 | |
520 | ret = 0; | |
521 | done: | |
97397687 | 522 | videobuf_queue_unlock(q); |
19bc5133 | 523 | return ret; |
7a7d9a89 | 524 | } |
7a02264c | 525 | EXPORT_SYMBOL_GPL(videobuf_querybuf); |
7a7d9a89 | 526 | |
7a02264c | 527 | int videobuf_qbuf(struct videobuf_queue *q, struct v4l2_buffer *b) |
7a7d9a89 MCC |
528 | { |
529 | struct videobuf_buffer *buf; | |
530 | enum v4l2_field field; | |
e2c77314 | 531 | unsigned long flags = 0; |
7a7d9a89 MCC |
532 | int retval; |
533 | ||
e2c77314 | 534 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 535 | |
9900132f ML |
536 | if (b->memory == V4L2_MEMORY_MMAP) |
537 | down_read(¤t->mm->mmap_sem); | |
538 | ||
97397687 | 539 | videobuf_queue_lock(q); |
7a7d9a89 MCC |
540 | retval = -EBUSY; |
541 | if (q->reading) { | |
e2c77314 | 542 | dprintk(1, "qbuf: Reading running...\n"); |
7a7d9a89 MCC |
543 | goto done; |
544 | } | |
545 | retval = -EINVAL; | |
546 | if (b->type != q->type) { | |
e2c77314 | 547 | dprintk(1, "qbuf: Wrong type.\n"); |
7a7d9a89 MCC |
548 | goto done; |
549 | } | |
223ffe5f | 550 | if (b->index >= VIDEO_MAX_FRAME) { |
e2c77314 | 551 | dprintk(1, "qbuf: index out of range.\n"); |
7a7d9a89 MCC |
552 | goto done; |
553 | } | |
554 | buf = q->bufs[b->index]; | |
555 | if (NULL == buf) { | |
e2c77314 | 556 | dprintk(1, "qbuf: buffer is null.\n"); |
7a7d9a89 MCC |
557 | goto done; |
558 | } | |
e2c77314 | 559 | MAGIC_CHECK(buf->magic, MAGIC_BUFFER); |
7a7d9a89 | 560 | if (buf->memory != b->memory) { |
e2c77314 | 561 | dprintk(1, "qbuf: memory type is wrong.\n"); |
7a7d9a89 MCC |
562 | goto done; |
563 | } | |
0fc0686e | 564 | if (buf->state != VIDEOBUF_NEEDS_INIT && buf->state != VIDEOBUF_IDLE) { |
e2c77314 | 565 | dprintk(1, "qbuf: buffer is already queued or active.\n"); |
7a7d9a89 MCC |
566 | goto done; |
567 | } | |
568 | ||
569 | if (b->flags & V4L2_BUF_FLAG_INPUT) { | |
570 | if (b->input >= q->inputs) { | |
e2c77314 | 571 | dprintk(1, "qbuf: wrong input.\n"); |
7a7d9a89 MCC |
572 | goto done; |
573 | } | |
574 | buf->input = b->input; | |
575 | } else { | |
576 | buf->input = UNSET; | |
577 | } | |
578 | ||
579 | switch (b->memory) { | |
580 | case V4L2_MEMORY_MMAP: | |
581 | if (0 == buf->baddr) { | |
e2c77314 MCC |
582 | dprintk(1, "qbuf: mmap requested " |
583 | "but buffer addr is zero!\n"); | |
7a7d9a89 MCC |
584 | goto done; |
585 | } | |
96f2ec67 PO |
586 | if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT |
587 | || q->type == V4L2_BUF_TYPE_VBI_OUTPUT | |
588 | || q->type == V4L2_BUF_TYPE_SLICED_VBI_OUTPUT) { | |
589 | buf->size = b->bytesused; | |
590 | buf->field = b->field; | |
591 | buf->ts = b->timestamp; | |
592 | } | |
7a7d9a89 MCC |
593 | break; |
594 | case V4L2_MEMORY_USERPTR: | |
595 | if (b->length < buf->bsize) { | |
e2c77314 | 596 | dprintk(1, "qbuf: buffer length is not enough\n"); |
7a7d9a89 MCC |
597 | goto done; |
598 | } | |
e2c77314 MCC |
599 | if (VIDEOBUF_NEEDS_INIT != buf->state && |
600 | buf->baddr != b->m.userptr) | |
601 | q->ops->buf_release(q, buf); | |
7a7d9a89 MCC |
602 | buf->baddr = b->m.userptr; |
603 | break; | |
604 | case V4L2_MEMORY_OVERLAY: | |
605 | buf->boff = b->m.offset; | |
606 | break; | |
607 | default: | |
e2c77314 | 608 | dprintk(1, "qbuf: wrong memory type\n"); |
7a7d9a89 MCC |
609 | goto done; |
610 | } | |
611 | ||
e2c77314 | 612 | dprintk(1, "qbuf: requesting next field\n"); |
7a7d9a89 | 613 | field = videobuf_next_field(q); |
e2c77314 | 614 | retval = q->ops->buf_prepare(q, buf, field); |
7a7d9a89 | 615 | if (0 != retval) { |
e2c77314 | 616 | dprintk(1, "qbuf: buffer_prepare returned %d\n", retval); |
7a7d9a89 MCC |
617 | goto done; |
618 | } | |
619 | ||
e2c77314 | 620 | list_add_tail(&buf->stream, &q->stream); |
7a7d9a89 | 621 | if (q->streaming) { |
0cf4daee | 622 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 623 | q->ops->buf_queue(q, buf); |
0cf4daee | 624 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 | 625 | } |
771075bb | 626 | dprintk(1, "qbuf: succeeded\n"); |
7a7d9a89 | 627 | retval = 0; |
137d1cb1 | 628 | wake_up_interruptible_sync(&q->wait); |
7a7d9a89 | 629 | |
7a02264c | 630 | done: |
97397687 | 631 | videobuf_queue_unlock(q); |
9900132f ML |
632 | |
633 | if (b->memory == V4L2_MEMORY_MMAP) | |
634 | up_read(¤t->mm->mmap_sem); | |
635 | ||
7a7d9a89 MCC |
636 | return retval; |
637 | } | |
7a02264c | 638 | EXPORT_SYMBOL_GPL(videobuf_qbuf); |
137d1cb1 BP |
639 | |
640 | /* Locking: Caller holds q->vb_lock */ | |
641 | static int stream_next_buffer_check_queue(struct videobuf_queue *q, int noblock) | |
7a7d9a89 | 642 | { |
7a7d9a89 MCC |
643 | int retval; |
644 | ||
137d1cb1 BP |
645 | checks: |
646 | if (!q->streaming) { | |
647 | dprintk(1, "next_buffer: Not streaming\n"); | |
648 | retval = -EINVAL; | |
7a7d9a89 MCC |
649 | goto done; |
650 | } | |
137d1cb1 | 651 | |
7a7d9a89 | 652 | if (list_empty(&q->stream)) { |
137d1cb1 BP |
653 | if (noblock) { |
654 | retval = -EAGAIN; | |
655 | dprintk(2, "next_buffer: no buffers to dequeue\n"); | |
656 | goto done; | |
657 | } else { | |
658 | dprintk(2, "next_buffer: waiting on buffer\n"); | |
659 | ||
660 | /* Drop lock to avoid deadlock with qbuf */ | |
97397687 | 661 | videobuf_queue_unlock(q); |
137d1cb1 BP |
662 | |
663 | /* Checking list_empty and streaming is safe without | |
664 | * locks because we goto checks to validate while | |
665 | * holding locks before proceeding */ | |
666 | retval = wait_event_interruptible(q->wait, | |
667 | !list_empty(&q->stream) || !q->streaming); | |
97397687 | 668 | videobuf_queue_lock(q); |
137d1cb1 BP |
669 | |
670 | if (retval) | |
671 | goto done; | |
672 | ||
673 | goto checks; | |
674 | } | |
7a7d9a89 | 675 | } |
137d1cb1 BP |
676 | |
677 | retval = 0; | |
678 | ||
679 | done: | |
680 | return retval; | |
681 | } | |
682 | ||
137d1cb1 BP |
683 | /* Locking: Caller holds q->vb_lock */ |
684 | static int stream_next_buffer(struct videobuf_queue *q, | |
685 | struct videobuf_buffer **vb, int nonblocking) | |
686 | { | |
687 | int retval; | |
688 | struct videobuf_buffer *buf = NULL; | |
689 | ||
690 | retval = stream_next_buffer_check_queue(q, nonblocking); | |
691 | if (retval) | |
692 | goto done; | |
693 | ||
7a7d9a89 | 694 | buf = list_entry(q->stream.next, struct videobuf_buffer, stream); |
0e0809a5 | 695 | retval = videobuf_waiton(q, buf, nonblocking, 1); |
137d1cb1 BP |
696 | if (retval < 0) |
697 | goto done; | |
698 | ||
699 | *vb = buf; | |
700 | done: | |
701 | return retval; | |
702 | } | |
703 | ||
704 | int videobuf_dqbuf(struct videobuf_queue *q, | |
7a02264c | 705 | struct v4l2_buffer *b, int nonblocking) |
137d1cb1 BP |
706 | { |
707 | struct videobuf_buffer *buf = NULL; | |
708 | int retval; | |
709 | ||
710 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
711 | ||
b2dfd1a4 | 712 | memset(b, 0, sizeof(*b)); |
97397687 | 713 | videobuf_queue_lock(q); |
137d1cb1 BP |
714 | |
715 | retval = stream_next_buffer(q, &buf, nonblocking); | |
7a7d9a89 | 716 | if (retval < 0) { |
137d1cb1 | 717 | dprintk(1, "dqbuf: next_buffer error: %i\n", retval); |
7a7d9a89 MCC |
718 | goto done; |
719 | } | |
137d1cb1 | 720 | |
7a7d9a89 | 721 | switch (buf->state) { |
0fc0686e | 722 | case VIDEOBUF_ERROR: |
e2c77314 | 723 | dprintk(1, "dqbuf: state is error\n"); |
7a7d9a89 | 724 | break; |
0fc0686e | 725 | case VIDEOBUF_DONE: |
e2c77314 | 726 | dprintk(1, "dqbuf: state is done\n"); |
7a7d9a89 MCC |
727 | break; |
728 | default: | |
e2c77314 | 729 | dprintk(1, "dqbuf: state invalid\n"); |
7a7d9a89 MCC |
730 | retval = -EINVAL; |
731 | goto done; | |
732 | } | |
b2dfd1a4 | 733 | CALL(q, sync, q, buf); |
e2c77314 | 734 | videobuf_status(q, b, buf, q->type); |
b2dfd1a4 HV |
735 | list_del(&buf->stream); |
736 | buf->state = VIDEOBUF_IDLE; | |
737 | b->flags &= ~V4L2_BUF_FLAG_DONE; | |
7a02264c | 738 | done: |
97397687 | 739 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
740 | return retval; |
741 | } | |
7a02264c | 742 | EXPORT_SYMBOL_GPL(videobuf_dqbuf); |
7a7d9a89 MCC |
743 | |
744 | int videobuf_streamon(struct videobuf_queue *q) | |
745 | { | |
746 | struct videobuf_buffer *buf; | |
e2c77314 | 747 | unsigned long flags = 0; |
7a7d9a89 MCC |
748 | int retval; |
749 | ||
97397687 | 750 | videobuf_queue_lock(q); |
7a7d9a89 MCC |
751 | retval = -EBUSY; |
752 | if (q->reading) | |
753 | goto done; | |
754 | retval = 0; | |
755 | if (q->streaming) | |
756 | goto done; | |
757 | q->streaming = 1; | |
0cf4daee | 758 | spin_lock_irqsave(q->irqlock, flags); |
a991f44b | 759 | list_for_each_entry(buf, &q->stream, stream) |
0fc0686e | 760 | if (buf->state == VIDEOBUF_PREPARED) |
e2c77314 | 761 | q->ops->buf_queue(q, buf); |
0cf4daee | 762 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 | 763 | |
137d1cb1 | 764 | wake_up_interruptible_sync(&q->wait); |
7a02264c | 765 | done: |
97397687 | 766 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
767 | return retval; |
768 | } | |
7a02264c | 769 | EXPORT_SYMBOL_GPL(videobuf_streamon); |
7a7d9a89 | 770 | |
64f9477f | 771 | /* Locking: Caller holds q->vb_lock */ |
19bc5133 | 772 | static int __videobuf_streamoff(struct videobuf_queue *q) |
7a7d9a89 | 773 | { |
7a7d9a89 | 774 | if (!q->streaming) |
19bc5133 BP |
775 | return -EINVAL; |
776 | ||
7a7d9a89 | 777 | videobuf_queue_cancel(q); |
7a7d9a89 | 778 | |
19bc5133 BP |
779 | return 0; |
780 | } | |
781 | ||
782 | int videobuf_streamoff(struct videobuf_queue *q) | |
783 | { | |
784 | int retval; | |
785 | ||
97397687 | 786 | videobuf_queue_lock(q); |
19bc5133 | 787 | retval = __videobuf_streamoff(q); |
97397687 | 788 | videobuf_queue_unlock(q); |
19bc5133 | 789 | |
7a7d9a89 MCC |
790 | return retval; |
791 | } | |
7a02264c | 792 | EXPORT_SYMBOL_GPL(videobuf_streamoff); |
7a7d9a89 | 793 | |
64f9477f | 794 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
795 | static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q, |
796 | char __user *data, | |
797 | size_t count, loff_t *ppos) | |
798 | { | |
799 | enum v4l2_field field; | |
e2c77314 | 800 | unsigned long flags = 0; |
7a7d9a89 MCC |
801 | int retval; |
802 | ||
e2c77314 | 803 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 MCC |
804 | |
805 | /* setup stuff */ | |
33c38283 | 806 | q->read_buf = videobuf_alloc_vb(q); |
7a7d9a89 MCC |
807 | if (NULL == q->read_buf) |
808 | return -ENOMEM; | |
809 | ||
810 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
811 | q->read_buf->baddr = (unsigned long)data; | |
812 | q->read_buf->bsize = count; | |
813 | ||
814 | field = videobuf_next_field(q); | |
e2c77314 | 815 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
7a7d9a89 MCC |
816 | if (0 != retval) |
817 | goto done; | |
818 | ||
819 | /* start capture & wait */ | |
0cf4daee | 820 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 821 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee | 822 | spin_unlock_irqrestore(q->irqlock, flags); |
0e0809a5 | 823 | retval = videobuf_waiton(q, q->read_buf, 0, 0); |
7a7d9a89 | 824 | if (0 == retval) { |
e2c77314 | 825 | CALL(q, sync, q, q->read_buf); |
0fc0686e | 826 | if (VIDEOBUF_ERROR == q->read_buf->state) |
7a7d9a89 MCC |
827 | retval = -EIO; |
828 | else | |
829 | retval = q->read_buf->size; | |
830 | } | |
831 | ||
7a02264c | 832 | done: |
7a7d9a89 | 833 | /* cleanup */ |
e2c77314 | 834 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
835 | kfree(q->read_buf); |
836 | q->read_buf = NULL; | |
837 | return retval; | |
838 | } | |
839 | ||
37111039 HV |
840 | static int __videobuf_copy_to_user(struct videobuf_queue *q, |
841 | struct videobuf_buffer *buf, | |
842 | char __user *data, size_t count, | |
843 | int nonblocking) | |
844 | { | |
845 | void *vaddr = CALL(q, vaddr, buf); | |
846 | ||
847 | /* copy to userspace */ | |
848 | if (count > buf->size - q->read_off) | |
849 | count = buf->size - q->read_off; | |
850 | ||
851 | if (copy_to_user(data, vaddr + q->read_off, count)) | |
852 | return -EFAULT; | |
853 | ||
854 | return count; | |
855 | } | |
856 | ||
857 | static int __videobuf_copy_stream(struct videobuf_queue *q, | |
858 | struct videobuf_buffer *buf, | |
859 | char __user *data, size_t count, size_t pos, | |
860 | int vbihack, int nonblocking) | |
861 | { | |
862 | unsigned int *fc = CALL(q, vaddr, buf); | |
863 | ||
864 | if (vbihack) { | |
865 | /* dirty, undocumented hack -- pass the frame counter | |
866 | * within the last four bytes of each vbi data block. | |
867 | * We need that one to maintain backward compatibility | |
868 | * to all vbi decoding software out there ... */ | |
869 | fc += (buf->size >> 2) - 1; | |
870 | *fc = buf->field_count >> 1; | |
871 | dprintk(1, "vbihack: %d\n", *fc); | |
872 | } | |
873 | ||
874 | /* copy stuff using the common method */ | |
875 | count = __videobuf_copy_to_user(q, buf, data, count, nonblocking); | |
876 | ||
877 | if ((count == -EFAULT) && (pos == 0)) | |
878 | return -EFAULT; | |
879 | ||
880 | return count; | |
881 | } | |
882 | ||
7a7d9a89 MCC |
883 | ssize_t videobuf_read_one(struct videobuf_queue *q, |
884 | char __user *data, size_t count, loff_t *ppos, | |
885 | int nonblocking) | |
886 | { | |
887 | enum v4l2_field field; | |
e2c77314 | 888 | unsigned long flags = 0; |
7daa4a88 | 889 | unsigned size = 0, nbufs = 1; |
7a7d9a89 MCC |
890 | int retval; |
891 | ||
e2c77314 | 892 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 893 | |
97397687 | 894 | videobuf_queue_lock(q); |
7a7d9a89 | 895 | |
e2c77314 | 896 | q->ops->buf_setup(q, &nbufs, &size); |
7a7d9a89 MCC |
897 | |
898 | if (NULL == q->read_buf && | |
899 | count >= size && | |
900 | !nonblocking) { | |
e2c77314 | 901 | retval = videobuf_read_zerocopy(q, data, count, ppos); |
7a7d9a89 MCC |
902 | if (retval >= 0 || retval == -EIO) |
903 | /* ok, all done */ | |
904 | goto done; | |
905 | /* fallback to kernel bounce buffer on failures */ | |
906 | } | |
907 | ||
908 | if (NULL == q->read_buf) { | |
909 | /* need to capture a new frame */ | |
910 | retval = -ENOMEM; | |
33c38283 | 911 | q->read_buf = videobuf_alloc_vb(q); |
7a7d9a89 | 912 | |
e2c77314 | 913 | dprintk(1, "video alloc=0x%p\n", q->read_buf); |
7a7d9a89 MCC |
914 | if (NULL == q->read_buf) |
915 | goto done; | |
916 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
917 | q->read_buf->bsize = count; /* preferred size */ | |
918 | field = videobuf_next_field(q); | |
e2c77314 | 919 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
7a7d9a89 MCC |
920 | |
921 | if (0 != retval) { | |
e2c77314 | 922 | kfree(q->read_buf); |
7a7d9a89 MCC |
923 | q->read_buf = NULL; |
924 | goto done; | |
925 | } | |
7a7d9a89 | 926 | |
0cf4daee | 927 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 928 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee BP |
929 | spin_unlock_irqrestore(q->irqlock, flags); |
930 | ||
7a7d9a89 MCC |
931 | q->read_off = 0; |
932 | } | |
933 | ||
934 | /* wait until capture is done */ | |
0e0809a5 | 935 | retval = videobuf_waiton(q, q->read_buf, nonblocking, 1); |
7a7d9a89 MCC |
936 | if (0 != retval) |
937 | goto done; | |
938 | ||
e2c77314 | 939 | CALL(q, sync, q, q->read_buf); |
7a7d9a89 | 940 | |
0fc0686e | 941 | if (VIDEOBUF_ERROR == q->read_buf->state) { |
7a7d9a89 | 942 | /* catch I/O errors */ |
e2c77314 | 943 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
944 | kfree(q->read_buf); |
945 | q->read_buf = NULL; | |
946 | retval = -EIO; | |
947 | goto done; | |
948 | } | |
949 | ||
950 | /* Copy to userspace */ | |
37111039 | 951 | retval = __videobuf_copy_to_user(q, q->read_buf, data, count, nonblocking); |
e2c77314 | 952 | if (retval < 0) |
7a7d9a89 MCC |
953 | goto done; |
954 | ||
955 | q->read_off += retval; | |
956 | if (q->read_off == q->read_buf->size) { | |
957 | /* all data copied, cleanup */ | |
e2c77314 | 958 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
959 | kfree(q->read_buf); |
960 | q->read_buf = NULL; | |
961 | } | |
962 | ||
7a02264c | 963 | done: |
97397687 | 964 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
965 | return retval; |
966 | } | |
7a02264c | 967 | EXPORT_SYMBOL_GPL(videobuf_read_one); |
7a7d9a89 | 968 | |
64f9477f | 969 | /* Locking: Caller holds q->vb_lock */ |
225ba900 | 970 | static int __videobuf_read_start(struct videobuf_queue *q) |
7a7d9a89 MCC |
971 | { |
972 | enum v4l2_field field; | |
e2c77314 | 973 | unsigned long flags = 0; |
49ee718e | 974 | unsigned int count = 0, size = 0; |
7a7d9a89 MCC |
975 | int err, i; |
976 | ||
e2c77314 | 977 | q->ops->buf_setup(q, &count, &size); |
7a7d9a89 MCC |
978 | if (count < 2) |
979 | count = 2; | |
980 | if (count > VIDEO_MAX_FRAME) | |
981 | count = VIDEO_MAX_FRAME; | |
982 | size = PAGE_ALIGN(size); | |
983 | ||
19bc5133 | 984 | err = __videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR); |
49ee718e | 985 | if (err < 0) |
7a7d9a89 MCC |
986 | return err; |
987 | ||
49ee718e BP |
988 | count = err; |
989 | ||
7a7d9a89 MCC |
990 | for (i = 0; i < count; i++) { |
991 | field = videobuf_next_field(q); | |
e2c77314 | 992 | err = q->ops->buf_prepare(q, q->bufs[i], field); |
7a7d9a89 MCC |
993 | if (err) |
994 | return err; | |
995 | list_add_tail(&q->bufs[i]->stream, &q->stream); | |
996 | } | |
0cf4daee | 997 | spin_lock_irqsave(q->irqlock, flags); |
7a7d9a89 | 998 | for (i = 0; i < count; i++) |
e2c77314 | 999 | q->ops->buf_queue(q, q->bufs[i]); |
0cf4daee | 1000 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
1001 | q->reading = 1; |
1002 | return 0; | |
1003 | } | |
1004 | ||
19bc5133 | 1005 | static void __videobuf_read_stop(struct videobuf_queue *q) |
7a7d9a89 MCC |
1006 | { |
1007 | int i; | |
1008 | ||
1009 | videobuf_queue_cancel(q); | |
a438d6da | 1010 | __videobuf_free(q); |
7a7d9a89 MCC |
1011 | INIT_LIST_HEAD(&q->stream); |
1012 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
1013 | if (NULL == q->bufs[i]) | |
1014 | continue; | |
1015 | kfree(q->bufs[i]); | |
1016 | q->bufs[i] = NULL; | |
1017 | } | |
1018 | q->read_buf = NULL; | |
19bc5133 BP |
1019 | } |
1020 | ||
19fb1457 MCC |
1021 | int videobuf_read_start(struct videobuf_queue *q) |
1022 | { | |
1023 | int rc; | |
1024 | ||
97397687 | 1025 | videobuf_queue_lock(q); |
19fb1457 | 1026 | rc = __videobuf_read_start(q); |
97397687 | 1027 | videobuf_queue_unlock(q); |
19fb1457 MCC |
1028 | |
1029 | return rc; | |
1030 | } | |
7a02264c | 1031 | EXPORT_SYMBOL_GPL(videobuf_read_start); |
19fb1457 | 1032 | |
19bc5133 BP |
1033 | void videobuf_read_stop(struct videobuf_queue *q) |
1034 | { | |
97397687 | 1035 | videobuf_queue_lock(q); |
19bc5133 | 1036 | __videobuf_read_stop(q); |
97397687 | 1037 | videobuf_queue_unlock(q); |
19bc5133 | 1038 | } |
7a02264c | 1039 | EXPORT_SYMBOL_GPL(videobuf_read_stop); |
19bc5133 BP |
1040 | |
1041 | void videobuf_stop(struct videobuf_queue *q) | |
1042 | { | |
97397687 | 1043 | videobuf_queue_lock(q); |
19bc5133 BP |
1044 | |
1045 | if (q->streaming) | |
1046 | __videobuf_streamoff(q); | |
1047 | ||
1048 | if (q->reading) | |
1049 | __videobuf_read_stop(q); | |
1050 | ||
97397687 | 1051 | videobuf_queue_unlock(q); |
7a7d9a89 | 1052 | } |
7a02264c | 1053 | EXPORT_SYMBOL_GPL(videobuf_stop); |
19bc5133 | 1054 | |
7a7d9a89 MCC |
1055 | ssize_t videobuf_read_stream(struct videobuf_queue *q, |
1056 | char __user *data, size_t count, loff_t *ppos, | |
1057 | int vbihack, int nonblocking) | |
1058 | { | |
1059 | int rc, retval; | |
e2c77314 | 1060 | unsigned long flags = 0; |
7a7d9a89 | 1061 | |
e2c77314 | 1062 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1063 | |
7e28adb2 | 1064 | dprintk(2, "%s\n", __func__); |
97397687 | 1065 | videobuf_queue_lock(q); |
7a7d9a89 MCC |
1066 | retval = -EBUSY; |
1067 | if (q->streaming) | |
1068 | goto done; | |
1069 | if (!q->reading) { | |
3f84307a | 1070 | retval = __videobuf_read_start(q); |
7a7d9a89 MCC |
1071 | if (retval < 0) |
1072 | goto done; | |
1073 | } | |
1074 | ||
1075 | retval = 0; | |
1076 | while (count > 0) { | |
1077 | /* get / wait for data */ | |
1078 | if (NULL == q->read_buf) { | |
1079 | q->read_buf = list_entry(q->stream.next, | |
1080 | struct videobuf_buffer, | |
1081 | stream); | |
1082 | list_del(&q->read_buf->stream); | |
1083 | q->read_off = 0; | |
1084 | } | |
0e0809a5 | 1085 | rc = videobuf_waiton(q, q->read_buf, nonblocking, 1); |
7a7d9a89 MCC |
1086 | if (rc < 0) { |
1087 | if (0 == retval) | |
1088 | retval = rc; | |
1089 | break; | |
1090 | } | |
1091 | ||
0fc0686e | 1092 | if (q->read_buf->state == VIDEOBUF_DONE) { |
37111039 | 1093 | rc = __videobuf_copy_stream(q, q->read_buf, data + retval, count, |
7a7d9a89 MCC |
1094 | retval, vbihack, nonblocking); |
1095 | if (rc < 0) { | |
1096 | retval = rc; | |
1097 | break; | |
1098 | } | |
1099 | retval += rc; | |
1100 | count -= rc; | |
1101 | q->read_off += rc; | |
1102 | } else { | |
1103 | /* some error */ | |
1104 | q->read_off = q->read_buf->size; | |
1105 | if (0 == retval) | |
1106 | retval = -EIO; | |
1107 | } | |
1108 | ||
1109 | /* requeue buffer when done with copying */ | |
1110 | if (q->read_off == q->read_buf->size) { | |
1111 | list_add_tail(&q->read_buf->stream, | |
1112 | &q->stream); | |
0cf4daee | 1113 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 1114 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee | 1115 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
1116 | q->read_buf = NULL; |
1117 | } | |
1118 | if (retval < 0) | |
1119 | break; | |
1120 | } | |
1121 | ||
7a02264c | 1122 | done: |
97397687 | 1123 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
1124 | return retval; |
1125 | } | |
7a02264c | 1126 | EXPORT_SYMBOL_GPL(videobuf_read_stream); |
7a7d9a89 MCC |
1127 | |
1128 | unsigned int videobuf_poll_stream(struct file *file, | |
1129 | struct videobuf_queue *q, | |
1130 | poll_table *wait) | |
1131 | { | |
1132 | struct videobuf_buffer *buf = NULL; | |
1133 | unsigned int rc = 0; | |
1134 | ||
97397687 | 1135 | videobuf_queue_lock(q); |
7a7d9a89 MCC |
1136 | if (q->streaming) { |
1137 | if (!list_empty(&q->stream)) | |
1138 | buf = list_entry(q->stream.next, | |
1139 | struct videobuf_buffer, stream); | |
1140 | } else { | |
1141 | if (!q->reading) | |
3f84307a | 1142 | __videobuf_read_start(q); |
7a7d9a89 MCC |
1143 | if (!q->reading) { |
1144 | rc = POLLERR; | |
1145 | } else if (NULL == q->read_buf) { | |
1146 | q->read_buf = list_entry(q->stream.next, | |
1147 | struct videobuf_buffer, | |
1148 | stream); | |
1149 | list_del(&q->read_buf->stream); | |
1150 | q->read_off = 0; | |
1151 | } | |
1152 | buf = q->read_buf; | |
1153 | } | |
1154 | if (!buf) | |
1155 | rc = POLLERR; | |
1156 | ||
1157 | if (0 == rc) { | |
1158 | poll_wait(file, &buf->done, wait); | |
0fc0686e | 1159 | if (buf->state == VIDEOBUF_DONE || |
9b558434 PO |
1160 | buf->state == VIDEOBUF_ERROR) { |
1161 | switch (q->type) { | |
1162 | case V4L2_BUF_TYPE_VIDEO_OUTPUT: | |
1163 | case V4L2_BUF_TYPE_VBI_OUTPUT: | |
1164 | case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT: | |
1165 | rc = POLLOUT | POLLWRNORM; | |
1166 | break; | |
1167 | default: | |
1168 | rc = POLLIN | POLLRDNORM; | |
1169 | break; | |
1170 | } | |
1171 | } | |
7a7d9a89 | 1172 | } |
97397687 | 1173 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
1174 | return rc; |
1175 | } | |
7a02264c | 1176 | EXPORT_SYMBOL_GPL(videobuf_poll_stream); |
7a7d9a89 | 1177 | |
7a02264c | 1178 | int videobuf_mmap_mapper(struct videobuf_queue *q, struct vm_area_struct *vma) |
7a7d9a89 | 1179 | { |
0b62b737 HV |
1180 | int rc = -EINVAL; |
1181 | int i; | |
7a7d9a89 | 1182 | |
e2c77314 | 1183 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1184 | |
0b62b737 HV |
1185 | if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED)) { |
1186 | dprintk(1, "mmap appl bug: PROT_WRITE and MAP_SHARED are required\n"); | |
1187 | return -EINVAL; | |
1188 | } | |
1189 | ||
97397687 | 1190 | videobuf_queue_lock(q); |
0b62b737 HV |
1191 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
1192 | struct videobuf_buffer *buf = q->bufs[i]; | |
1193 | ||
1194 | if (buf && buf->memory == V4L2_MEMORY_MMAP && | |
1195 | buf->boff == (vma->vm_pgoff << PAGE_SHIFT)) { | |
1196 | rc = CALL(q, mmap_mapper, q, buf, vma); | |
1197 | break; | |
1198 | } | |
1199 | } | |
97397687 | 1200 | videobuf_queue_unlock(q); |
7a7d9a89 | 1201 | |
0b62b737 | 1202 | return rc; |
7a7d9a89 | 1203 | } |
7a02264c | 1204 | EXPORT_SYMBOL_GPL(videobuf_mmap_mapper); |