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1 | /* |
2 | * Memory-to-memory device framework for Video for Linux 2 and videobuf. | |
3 | * | |
4 | * Helper functions for devices that use videobuf buffers for both their | |
5 | * source and destination. | |
6 | * | |
7 | * Copyright (c) 2009-2010 Samsung Electronics Co., Ltd. | |
8 | * Pawel Osciak, <p.osciak@samsung.com> | |
9 | * Marek Szyprowski, <m.szyprowski@samsung.com> | |
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 the | |
13 | * Free Software Foundation; either version 2 of the License, or (at your | |
14 | * option) any later version. | |
15 | */ | |
16 | #include <linux/module.h> | |
17 | #include <linux/sched.h> | |
18 | #include <linux/slab.h> | |
19 | ||
20 | #include <media/videobuf-core.h> | |
21 | #include <media/v4l2-mem2mem.h> | |
22 | ||
23 | MODULE_DESCRIPTION("Mem to mem device framework for videobuf"); | |
24 | MODULE_AUTHOR("Pawel Osciak, <p.osciak@samsung.com>"); | |
25 | MODULE_LICENSE("GPL"); | |
26 | ||
27 | static bool debug; | |
28 | module_param(debug, bool, 0644); | |
29 | ||
30 | #define dprintk(fmt, arg...) \ | |
31 | do { \ | |
32 | if (debug) \ | |
33 | printk(KERN_DEBUG "%s: " fmt, __func__, ## arg);\ | |
34 | } while (0) | |
35 | ||
36 | ||
37 | /* Instance is already queued on the job_queue */ | |
38 | #define TRANS_QUEUED (1 << 0) | |
39 | /* Instance is currently running in hardware */ | |
40 | #define TRANS_RUNNING (1 << 1) | |
41 | ||
42 | ||
43 | /* Offset base for buffers on the destination queue - used to distinguish | |
44 | * between source and destination buffers when mmapping - they receive the same | |
45 | * offsets but for different queues */ | |
46 | #define DST_QUEUE_OFF_BASE (1 << 30) | |
47 | ||
48 | ||
49 | /** | |
50 | * struct v4l2_m2m_dev - per-device context | |
51 | * @curr_ctx: currently running instance | |
52 | * @job_queue: instances queued to run | |
53 | * @job_spinlock: protects job_queue | |
54 | * @m2m_ops: driver callbacks | |
55 | */ | |
56 | struct v4l2_m2m_dev { | |
57 | struct v4l2_m2m_ctx *curr_ctx; | |
58 | ||
59 | struct list_head job_queue; | |
60 | spinlock_t job_spinlock; | |
61 | ||
62 | struct v4l2_m2m_ops *m2m_ops; | |
63 | }; | |
64 | ||
65 | static struct v4l2_m2m_queue_ctx *get_queue_ctx(struct v4l2_m2m_ctx *m2m_ctx, | |
66 | enum v4l2_buf_type type) | |
67 | { | |
68 | switch (type) { | |
69 | case V4L2_BUF_TYPE_VIDEO_CAPTURE: | |
70 | return &m2m_ctx->cap_q_ctx; | |
71 | case V4L2_BUF_TYPE_VIDEO_OUTPUT: | |
72 | return &m2m_ctx->out_q_ctx; | |
73 | default: | |
74 | printk(KERN_ERR "Invalid buffer type\n"); | |
75 | return NULL; | |
76 | } | |
77 | } | |
78 | ||
79 | /** | |
80 | * v4l2_m2m_get_vq() - return videobuf_queue for the given type | |
81 | */ | |
82 | struct videobuf_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx, | |
83 | enum v4l2_buf_type type) | |
84 | { | |
85 | struct v4l2_m2m_queue_ctx *q_ctx; | |
86 | ||
87 | q_ctx = get_queue_ctx(m2m_ctx, type); | |
88 | if (!q_ctx) | |
89 | return NULL; | |
90 | ||
91 | return &q_ctx->q; | |
92 | } | |
93 | EXPORT_SYMBOL(v4l2_m2m_get_vq); | |
94 | ||
95 | /** | |
96 | * v4l2_m2m_next_buf() - return next buffer from the list of ready buffers | |
97 | */ | |
98 | void *v4l2_m2m_next_buf(struct v4l2_m2m_ctx *m2m_ctx, enum v4l2_buf_type type) | |
99 | { | |
100 | struct v4l2_m2m_queue_ctx *q_ctx; | |
101 | struct videobuf_buffer *vb = NULL; | |
102 | unsigned long flags; | |
103 | ||
104 | q_ctx = get_queue_ctx(m2m_ctx, type); | |
105 | if (!q_ctx) | |
106 | return NULL; | |
107 | ||
108 | spin_lock_irqsave(q_ctx->q.irqlock, flags); | |
109 | ||
110 | if (list_empty(&q_ctx->rdy_queue)) | |
111 | goto end; | |
112 | ||
113 | vb = list_entry(q_ctx->rdy_queue.next, struct videobuf_buffer, queue); | |
114 | vb->state = VIDEOBUF_ACTIVE; | |
115 | ||
116 | end: | |
117 | spin_unlock_irqrestore(q_ctx->q.irqlock, flags); | |
118 | return vb; | |
119 | } | |
120 | EXPORT_SYMBOL_GPL(v4l2_m2m_next_buf); | |
121 | ||
122 | /** | |
123 | * v4l2_m2m_buf_remove() - take off a buffer from the list of ready buffers and | |
124 | * return it | |
125 | */ | |
126 | void *v4l2_m2m_buf_remove(struct v4l2_m2m_ctx *m2m_ctx, enum v4l2_buf_type type) | |
127 | { | |
128 | struct v4l2_m2m_queue_ctx *q_ctx; | |
129 | struct videobuf_buffer *vb = NULL; | |
130 | unsigned long flags; | |
131 | ||
132 | q_ctx = get_queue_ctx(m2m_ctx, type); | |
133 | if (!q_ctx) | |
134 | return NULL; | |
135 | ||
136 | spin_lock_irqsave(q_ctx->q.irqlock, flags); | |
137 | if (!list_empty(&q_ctx->rdy_queue)) { | |
138 | vb = list_entry(q_ctx->rdy_queue.next, struct videobuf_buffer, | |
139 | queue); | |
140 | list_del(&vb->queue); | |
141 | q_ctx->num_rdy--; | |
142 | } | |
143 | spin_unlock_irqrestore(q_ctx->q.irqlock, flags); | |
144 | ||
145 | return vb; | |
146 | } | |
147 | EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove); | |
148 | ||
149 | /* | |
150 | * Scheduling handlers | |
151 | */ | |
152 | ||
153 | /** | |
154 | * v4l2_m2m_get_curr_priv() - return driver private data for the currently | |
155 | * running instance or NULL if no instance is running | |
156 | */ | |
157 | void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev) | |
158 | { | |
159 | unsigned long flags; | |
160 | void *ret = NULL; | |
161 | ||
162 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags); | |
163 | if (m2m_dev->curr_ctx) | |
164 | ret = m2m_dev->curr_ctx->priv; | |
165 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
166 | ||
167 | return ret; | |
168 | } | |
169 | EXPORT_SYMBOL(v4l2_m2m_get_curr_priv); | |
170 | ||
171 | /** | |
172 | * v4l2_m2m_try_run() - select next job to perform and run it if possible | |
173 | * | |
174 | * Get next transaction (if present) from the waiting jobs list and run it. | |
175 | */ | |
176 | static void v4l2_m2m_try_run(struct v4l2_m2m_dev *m2m_dev) | |
177 | { | |
178 | unsigned long flags; | |
179 | ||
180 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags); | |
181 | if (NULL != m2m_dev->curr_ctx) { | |
182 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
183 | dprintk("Another instance is running, won't run now\n"); | |
184 | return; | |
185 | } | |
186 | ||
187 | if (list_empty(&m2m_dev->job_queue)) { | |
188 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
189 | dprintk("No job pending\n"); | |
190 | return; | |
191 | } | |
192 | ||
193 | m2m_dev->curr_ctx = list_entry(m2m_dev->job_queue.next, | |
194 | struct v4l2_m2m_ctx, queue); | |
195 | m2m_dev->curr_ctx->job_flags |= TRANS_RUNNING; | |
196 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
197 | ||
198 | m2m_dev->m2m_ops->device_run(m2m_dev->curr_ctx->priv); | |
199 | } | |
200 | ||
201 | /** | |
202 | * v4l2_m2m_try_schedule() - check whether an instance is ready to be added to | |
203 | * the pending job queue and add it if so. | |
204 | * @m2m_ctx: m2m context assigned to the instance to be checked | |
205 | * | |
206 | * There are three basic requirements an instance has to meet to be able to run: | |
207 | * 1) at least one source buffer has to be queued, | |
208 | * 2) at least one destination buffer has to be queued, | |
209 | * 3) streaming has to be on. | |
210 | * | |
211 | * There may also be additional, custom requirements. In such case the driver | |
212 | * should supply a custom callback (job_ready in v4l2_m2m_ops) that should | |
213 | * return 1 if the instance is ready. | |
214 | * An example of the above could be an instance that requires more than one | |
215 | * src/dst buffer per transaction. | |
216 | */ | |
217 | static void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx) | |
218 | { | |
219 | struct v4l2_m2m_dev *m2m_dev; | |
220 | unsigned long flags_job, flags; | |
221 | ||
222 | m2m_dev = m2m_ctx->m2m_dev; | |
223 | dprintk("Trying to schedule a job for m2m_ctx: %p\n", m2m_ctx); | |
224 | ||
225 | if (!m2m_ctx->out_q_ctx.q.streaming | |
226 | || !m2m_ctx->cap_q_ctx.q.streaming) { | |
227 | dprintk("Streaming needs to be on for both queues\n"); | |
228 | return; | |
229 | } | |
230 | ||
231 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job); | |
232 | if (m2m_ctx->job_flags & TRANS_QUEUED) { | |
233 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); | |
234 | dprintk("On job queue already\n"); | |
235 | return; | |
236 | } | |
237 | ||
238 | spin_lock_irqsave(m2m_ctx->out_q_ctx.q.irqlock, flags); | |
239 | if (list_empty(&m2m_ctx->out_q_ctx.rdy_queue)) { | |
240 | spin_unlock_irqrestore(m2m_ctx->out_q_ctx.q.irqlock, flags); | |
241 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); | |
242 | dprintk("No input buffers available\n"); | |
243 | return; | |
244 | } | |
245 | if (list_empty(&m2m_ctx->cap_q_ctx.rdy_queue)) { | |
246 | spin_unlock_irqrestore(m2m_ctx->out_q_ctx.q.irqlock, flags); | |
247 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); | |
248 | dprintk("No output buffers available\n"); | |
249 | return; | |
250 | } | |
251 | spin_unlock_irqrestore(m2m_ctx->out_q_ctx.q.irqlock, flags); | |
252 | ||
253 | if (m2m_dev->m2m_ops->job_ready | |
254 | && (!m2m_dev->m2m_ops->job_ready(m2m_ctx->priv))) { | |
255 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); | |
256 | dprintk("Driver not ready\n"); | |
257 | return; | |
258 | } | |
259 | ||
260 | list_add_tail(&m2m_ctx->queue, &m2m_dev->job_queue); | |
261 | m2m_ctx->job_flags |= TRANS_QUEUED; | |
262 | ||
263 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job); | |
264 | ||
265 | v4l2_m2m_try_run(m2m_dev); | |
266 | } | |
267 | ||
268 | /** | |
269 | * v4l2_m2m_job_finish() - inform the framework that a job has been finished | |
270 | * and have it clean up | |
271 | * | |
272 | * Called by a driver to yield back the device after it has finished with it. | |
273 | * Should be called as soon as possible after reaching a state which allows | |
274 | * other instances to take control of the device. | |
275 | * | |
276 | * This function has to be called only after device_run() callback has been | |
277 | * called on the driver. To prevent recursion, it should not be called directly | |
278 | * from the device_run() callback though. | |
279 | */ | |
280 | void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev, | |
281 | struct v4l2_m2m_ctx *m2m_ctx) | |
282 | { | |
283 | unsigned long flags; | |
284 | ||
285 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags); | |
286 | if (!m2m_dev->curr_ctx || m2m_dev->curr_ctx != m2m_ctx) { | |
287 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
288 | dprintk("Called by an instance not currently running\n"); | |
289 | return; | |
290 | } | |
291 | ||
292 | list_del(&m2m_dev->curr_ctx->queue); | |
293 | m2m_dev->curr_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING); | |
294 | m2m_dev->curr_ctx = NULL; | |
295 | ||
296 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
297 | ||
298 | /* This instance might have more buffers ready, but since we do not | |
299 | * allow more than one job on the job_queue per instance, each has | |
300 | * to be scheduled separately after the previous one finishes. */ | |
301 | v4l2_m2m_try_schedule(m2m_ctx); | |
302 | v4l2_m2m_try_run(m2m_dev); | |
303 | } | |
304 | EXPORT_SYMBOL(v4l2_m2m_job_finish); | |
305 | ||
306 | /** | |
307 | * v4l2_m2m_reqbufs() - multi-queue-aware REQBUFS multiplexer | |
308 | */ | |
309 | int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
310 | struct v4l2_requestbuffers *reqbufs) | |
311 | { | |
312 | struct videobuf_queue *vq; | |
313 | ||
314 | vq = v4l2_m2m_get_vq(m2m_ctx, reqbufs->type); | |
315 | return videobuf_reqbufs(vq, reqbufs); | |
316 | } | |
317 | EXPORT_SYMBOL_GPL(v4l2_m2m_reqbufs); | |
318 | ||
319 | /** | |
320 | * v4l2_m2m_querybuf() - multi-queue-aware QUERYBUF multiplexer | |
321 | * | |
322 | * See v4l2_m2m_mmap() documentation for details. | |
323 | */ | |
324 | int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
325 | struct v4l2_buffer *buf) | |
326 | { | |
327 | struct videobuf_queue *vq; | |
328 | int ret; | |
329 | ||
330 | vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); | |
331 | ret = videobuf_querybuf(vq, buf); | |
332 | ||
333 | if (buf->memory == V4L2_MEMORY_MMAP | |
334 | && vq->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) { | |
335 | buf->m.offset += DST_QUEUE_OFF_BASE; | |
336 | } | |
337 | ||
338 | return ret; | |
339 | } | |
340 | EXPORT_SYMBOL_GPL(v4l2_m2m_querybuf); | |
341 | ||
342 | /** | |
343 | * v4l2_m2m_qbuf() - enqueue a source or destination buffer, depending on | |
344 | * the type | |
345 | */ | |
346 | int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
347 | struct v4l2_buffer *buf) | |
348 | { | |
349 | struct videobuf_queue *vq; | |
350 | int ret; | |
351 | ||
352 | vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); | |
353 | ret = videobuf_qbuf(vq, buf); | |
354 | if (!ret) | |
355 | v4l2_m2m_try_schedule(m2m_ctx); | |
356 | ||
357 | return ret; | |
358 | } | |
359 | EXPORT_SYMBOL_GPL(v4l2_m2m_qbuf); | |
360 | ||
361 | /** | |
362 | * v4l2_m2m_dqbuf() - dequeue a source or destination buffer, depending on | |
363 | * the type | |
364 | */ | |
365 | int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
366 | struct v4l2_buffer *buf) | |
367 | { | |
368 | struct videobuf_queue *vq; | |
369 | ||
370 | vq = v4l2_m2m_get_vq(m2m_ctx, buf->type); | |
371 | return videobuf_dqbuf(vq, buf, file->f_flags & O_NONBLOCK); | |
372 | } | |
373 | EXPORT_SYMBOL_GPL(v4l2_m2m_dqbuf); | |
374 | ||
375 | /** | |
376 | * v4l2_m2m_streamon() - turn on streaming for a video queue | |
377 | */ | |
378 | int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
379 | enum v4l2_buf_type type) | |
380 | { | |
381 | struct videobuf_queue *vq; | |
382 | int ret; | |
383 | ||
384 | vq = v4l2_m2m_get_vq(m2m_ctx, type); | |
385 | ret = videobuf_streamon(vq); | |
386 | if (!ret) | |
387 | v4l2_m2m_try_schedule(m2m_ctx); | |
388 | ||
389 | return ret; | |
390 | } | |
391 | EXPORT_SYMBOL_GPL(v4l2_m2m_streamon); | |
392 | ||
393 | /** | |
394 | * v4l2_m2m_streamoff() - turn off streaming for a video queue | |
395 | */ | |
396 | int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
397 | enum v4l2_buf_type type) | |
398 | { | |
399 | struct videobuf_queue *vq; | |
400 | ||
401 | vq = v4l2_m2m_get_vq(m2m_ctx, type); | |
402 | return videobuf_streamoff(vq); | |
403 | } | |
404 | EXPORT_SYMBOL_GPL(v4l2_m2m_streamoff); | |
405 | ||
406 | /** | |
407 | * v4l2_m2m_poll() - poll replacement, for destination buffers only | |
408 | * | |
409 | * Call from the driver's poll() function. Will poll both queues. If a buffer | |
410 | * is available to dequeue (with dqbuf) from the source queue, this will | |
411 | * indicate that a non-blocking write can be performed, while read will be | |
412 | * returned in case of the destination queue. | |
413 | */ | |
414 | unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
415 | struct poll_table_struct *wait) | |
416 | { | |
417 | struct videobuf_queue *src_q, *dst_q; | |
418 | struct videobuf_buffer *src_vb = NULL, *dst_vb = NULL; | |
419 | unsigned int rc = 0; | |
420 | ||
421 | src_q = v4l2_m2m_get_src_vq(m2m_ctx); | |
422 | dst_q = v4l2_m2m_get_dst_vq(m2m_ctx); | |
423 | ||
424 | mutex_lock(&src_q->vb_lock); | |
425 | mutex_lock(&dst_q->vb_lock); | |
426 | ||
427 | if (src_q->streaming && !list_empty(&src_q->stream)) | |
428 | src_vb = list_first_entry(&src_q->stream, | |
429 | struct videobuf_buffer, stream); | |
430 | if (dst_q->streaming && !list_empty(&dst_q->stream)) | |
431 | dst_vb = list_first_entry(&dst_q->stream, | |
432 | struct videobuf_buffer, stream); | |
433 | ||
434 | if (!src_vb && !dst_vb) { | |
435 | rc = POLLERR; | |
436 | goto end; | |
437 | } | |
438 | ||
439 | if (src_vb) { | |
440 | poll_wait(file, &src_vb->done, wait); | |
441 | if (src_vb->state == VIDEOBUF_DONE | |
442 | || src_vb->state == VIDEOBUF_ERROR) | |
443 | rc |= POLLOUT | POLLWRNORM; | |
444 | } | |
445 | if (dst_vb) { | |
446 | poll_wait(file, &dst_vb->done, wait); | |
447 | if (dst_vb->state == VIDEOBUF_DONE | |
448 | || dst_vb->state == VIDEOBUF_ERROR) | |
449 | rc |= POLLIN | POLLRDNORM; | |
450 | } | |
451 | ||
452 | end: | |
453 | mutex_unlock(&dst_q->vb_lock); | |
454 | mutex_unlock(&src_q->vb_lock); | |
455 | return rc; | |
456 | } | |
457 | EXPORT_SYMBOL_GPL(v4l2_m2m_poll); | |
458 | ||
459 | /** | |
460 | * v4l2_m2m_mmap() - source and destination queues-aware mmap multiplexer | |
461 | * | |
462 | * Call from driver's mmap() function. Will handle mmap() for both queues | |
463 | * seamlessly for videobuffer, which will receive normal per-queue offsets and | |
464 | * proper videobuf queue pointers. The differentiation is made outside videobuf | |
465 | * by adding a predefined offset to buffers from one of the queues and | |
466 | * subtracting it before passing it back to videobuf. Only drivers (and | |
467 | * thus applications) receive modified offsets. | |
468 | */ | |
469 | int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, | |
470 | struct vm_area_struct *vma) | |
471 | { | |
472 | unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; | |
473 | struct videobuf_queue *vq; | |
474 | ||
475 | if (offset < DST_QUEUE_OFF_BASE) { | |
476 | vq = v4l2_m2m_get_src_vq(m2m_ctx); | |
477 | } else { | |
478 | vq = v4l2_m2m_get_dst_vq(m2m_ctx); | |
479 | vma->vm_pgoff -= (DST_QUEUE_OFF_BASE >> PAGE_SHIFT); | |
480 | } | |
481 | ||
482 | return videobuf_mmap_mapper(vq, vma); | |
483 | } | |
484 | EXPORT_SYMBOL(v4l2_m2m_mmap); | |
485 | ||
486 | /** | |
487 | * v4l2_m2m_init() - initialize per-driver m2m data | |
488 | * | |
489 | * Usually called from driver's probe() function. | |
490 | */ | |
491 | struct v4l2_m2m_dev *v4l2_m2m_init(struct v4l2_m2m_ops *m2m_ops) | |
492 | { | |
493 | struct v4l2_m2m_dev *m2m_dev; | |
494 | ||
495 | if (!m2m_ops) | |
496 | return ERR_PTR(-EINVAL); | |
497 | ||
498 | BUG_ON(!m2m_ops->device_run); | |
499 | BUG_ON(!m2m_ops->job_abort); | |
500 | ||
501 | m2m_dev = kzalloc(sizeof *m2m_dev, GFP_KERNEL); | |
502 | if (!m2m_dev) | |
503 | return ERR_PTR(-ENOMEM); | |
504 | ||
505 | m2m_dev->curr_ctx = NULL; | |
506 | m2m_dev->m2m_ops = m2m_ops; | |
507 | INIT_LIST_HEAD(&m2m_dev->job_queue); | |
508 | spin_lock_init(&m2m_dev->job_spinlock); | |
509 | ||
510 | return m2m_dev; | |
511 | } | |
512 | EXPORT_SYMBOL_GPL(v4l2_m2m_init); | |
513 | ||
514 | /** | |
515 | * v4l2_m2m_release() - cleans up and frees a m2m_dev structure | |
516 | * | |
517 | * Usually called from driver's remove() function. | |
518 | */ | |
519 | void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev) | |
520 | { | |
521 | kfree(m2m_dev); | |
522 | } | |
523 | EXPORT_SYMBOL_GPL(v4l2_m2m_release); | |
524 | ||
525 | /** | |
526 | * v4l2_m2m_ctx_init() - allocate and initialize a m2m context | |
527 | * @priv - driver's instance private data | |
528 | * @m2m_dev - a previously initialized m2m_dev struct | |
529 | * @vq_init - a callback for queue type-specific initialization function to be | |
530 | * used for initializing videobuf_queues | |
531 | * | |
532 | * Usually called from driver's open() function. | |
533 | */ | |
534 | struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(void *priv, struct v4l2_m2m_dev *m2m_dev, | |
535 | void (*vq_init)(void *priv, struct videobuf_queue *, | |
536 | enum v4l2_buf_type)) | |
537 | { | |
538 | struct v4l2_m2m_ctx *m2m_ctx; | |
539 | struct v4l2_m2m_queue_ctx *out_q_ctx, *cap_q_ctx; | |
540 | ||
541 | if (!vq_init) | |
542 | return ERR_PTR(-EINVAL); | |
543 | ||
544 | m2m_ctx = kzalloc(sizeof *m2m_ctx, GFP_KERNEL); | |
545 | if (!m2m_ctx) | |
546 | return ERR_PTR(-ENOMEM); | |
547 | ||
548 | m2m_ctx->priv = priv; | |
549 | m2m_ctx->m2m_dev = m2m_dev; | |
550 | ||
551 | out_q_ctx = get_queue_ctx(m2m_ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT); | |
552 | cap_q_ctx = get_queue_ctx(m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE); | |
553 | ||
554 | INIT_LIST_HEAD(&out_q_ctx->rdy_queue); | |
555 | INIT_LIST_HEAD(&cap_q_ctx->rdy_queue); | |
556 | ||
557 | INIT_LIST_HEAD(&m2m_ctx->queue); | |
558 | ||
559 | vq_init(priv, &out_q_ctx->q, V4L2_BUF_TYPE_VIDEO_OUTPUT); | |
560 | vq_init(priv, &cap_q_ctx->q, V4L2_BUF_TYPE_VIDEO_CAPTURE); | |
561 | out_q_ctx->q.priv_data = cap_q_ctx->q.priv_data = priv; | |
562 | ||
563 | return m2m_ctx; | |
564 | } | |
565 | EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_init); | |
566 | ||
567 | /** | |
568 | * v4l2_m2m_ctx_release() - release m2m context | |
569 | * | |
570 | * Usually called from driver's release() function. | |
571 | */ | |
572 | void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx) | |
573 | { | |
574 | struct v4l2_m2m_dev *m2m_dev; | |
575 | struct videobuf_buffer *vb; | |
576 | unsigned long flags; | |
577 | ||
578 | m2m_dev = m2m_ctx->m2m_dev; | |
579 | ||
580 | spin_lock_irqsave(&m2m_dev->job_spinlock, flags); | |
581 | if (m2m_ctx->job_flags & TRANS_RUNNING) { | |
582 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
583 | m2m_dev->m2m_ops->job_abort(m2m_ctx->priv); | |
584 | dprintk("m2m_ctx %p running, will wait to complete", m2m_ctx); | |
585 | vb = v4l2_m2m_next_dst_buf(m2m_ctx); | |
586 | BUG_ON(NULL == vb); | |
587 | wait_event(vb->done, vb->state != VIDEOBUF_ACTIVE | |
588 | && vb->state != VIDEOBUF_QUEUED); | |
589 | } else if (m2m_ctx->job_flags & TRANS_QUEUED) { | |
590 | list_del(&m2m_ctx->queue); | |
591 | m2m_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING); | |
592 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
593 | dprintk("m2m_ctx: %p had been on queue and was removed\n", | |
594 | m2m_ctx); | |
595 | } else { | |
596 | /* Do nothing, was not on queue/running */ | |
597 | spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags); | |
598 | } | |
599 | ||
600 | videobuf_stop(&m2m_ctx->cap_q_ctx.q); | |
601 | videobuf_stop(&m2m_ctx->out_q_ctx.q); | |
602 | ||
603 | videobuf_mmap_free(&m2m_ctx->cap_q_ctx.q); | |
604 | videobuf_mmap_free(&m2m_ctx->out_q_ctx.q); | |
605 | ||
606 | kfree(m2m_ctx); | |
607 | } | |
608 | EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_release); | |
609 | ||
610 | /** | |
611 | * v4l2_m2m_buf_queue() - add a buffer to the proper ready buffers list. | |
612 | * | |
613 | * Call from buf_queue(), videobuf_queue_ops callback. | |
614 | * | |
615 | * Locking: Caller holds q->irqlock (taken by videobuf before calling buf_queue | |
616 | * callback in the driver). | |
617 | */ | |
618 | void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx, struct videobuf_queue *vq, | |
619 | struct videobuf_buffer *vb) | |
620 | { | |
621 | struct v4l2_m2m_queue_ctx *q_ctx; | |
622 | ||
623 | q_ctx = get_queue_ctx(m2m_ctx, vq->type); | |
624 | if (!q_ctx) | |
625 | return; | |
626 | ||
627 | list_add_tail(&vb->queue, &q_ctx->rdy_queue); | |
628 | q_ctx->num_rdy++; | |
629 | ||
630 | vb->state = VIDEOBUF_QUEUED; | |
631 | } | |
632 | EXPORT_SYMBOL_GPL(v4l2_m2m_buf_queue); | |
633 |