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Diffstat (limited to 'drivers/media/video/cx18/cx18-fileops.c')
-rw-r--r--drivers/media/video/cx18/cx18-fileops.c896
1 files changed, 896 insertions, 0 deletions
diff --git a/drivers/media/video/cx18/cx18-fileops.c b/drivers/media/video/cx18/cx18-fileops.c
new file mode 100644
index 00000000000..07411f34885
--- /dev/null
+++ b/drivers/media/video/cx18/cx18-fileops.c
@@ -0,0 +1,896 @@
1/*
2 * cx18 file operation functions
3 *
4 * Derived from ivtv-fileops.c
5 *
6 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
7 * Copyright (C) 2008 Andy Walls <awalls@md.metrocast.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
22 * 02111-1307 USA
23 */
24
25#include "cx18-driver.h"
26#include "cx18-fileops.h"
27#include "cx18-i2c.h"
28#include "cx18-queue.h"
29#include "cx18-vbi.h"
30#include "cx18-audio.h"
31#include "cx18-mailbox.h"
32#include "cx18-scb.h"
33#include "cx18-streams.h"
34#include "cx18-controls.h"
35#include "cx18-ioctl.h"
36#include "cx18-cards.h"
37
38/* This function tries to claim the stream for a specific file descriptor.
39 If no one else is using this stream then the stream is claimed and
40 associated VBI and IDX streams are also automatically claimed.
41 Possible error returns: -EBUSY if someone else has claimed
42 the stream or 0 on success. */
43int cx18_claim_stream(struct cx18_open_id *id, int type)
44{
45 struct cx18 *cx = id->cx;
46 struct cx18_stream *s = &cx->streams[type];
47 struct cx18_stream *s_assoc;
48
49 /* Nothing should ever try to directly claim the IDX stream */
50 if (type == CX18_ENC_STREAM_TYPE_IDX) {
51 CX18_WARN("MPEG Index stream cannot be claimed "
52 "directly, but something tried.\n");
53 return -EINVAL;
54 }
55
56 if (test_and_set_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
57 /* someone already claimed this stream */
58 if (s->id == id->open_id) {
59 /* yes, this file descriptor did. So that's OK. */
60 return 0;
61 }
62 if (s->id == -1 && type == CX18_ENC_STREAM_TYPE_VBI) {
63 /* VBI is handled already internally, now also assign
64 the file descriptor to this stream for external
65 reading of the stream. */
66 s->id = id->open_id;
67 CX18_DEBUG_INFO("Start Read VBI\n");
68 return 0;
69 }
70 /* someone else is using this stream already */
71 CX18_DEBUG_INFO("Stream %d is busy\n", type);
72 return -EBUSY;
73 }
74 s->id = id->open_id;
75
76 /*
77 * CX18_ENC_STREAM_TYPE_MPG needs to claim:
78 * CX18_ENC_STREAM_TYPE_VBI, if VBI insertion is on for sliced VBI, or
79 * CX18_ENC_STREAM_TYPE_IDX, if VBI insertion is off for sliced VBI
80 * (We don't yet fix up MPEG Index entries for our inserted packets).
81 *
82 * For all other streams we're done.
83 */
84 if (type != CX18_ENC_STREAM_TYPE_MPG)
85 return 0;
86
87 s_assoc = &cx->streams[CX18_ENC_STREAM_TYPE_IDX];
88 if (cx->vbi.insert_mpeg && !cx18_raw_vbi(cx))
89 s_assoc = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
90 else if (!cx18_stream_enabled(s_assoc))
91 return 0;
92
93 set_bit(CX18_F_S_CLAIMED, &s_assoc->s_flags);
94
95 /* mark that it is used internally */
96 set_bit(CX18_F_S_INTERNAL_USE, &s_assoc->s_flags);
97 return 0;
98}
99EXPORT_SYMBOL(cx18_claim_stream);
100
101/* This function releases a previously claimed stream. It will take into
102 account associated VBI streams. */
103void cx18_release_stream(struct cx18_stream *s)
104{
105 struct cx18 *cx = s->cx;
106 struct cx18_stream *s_assoc;
107
108 s->id = -1;
109 if (s->type == CX18_ENC_STREAM_TYPE_IDX) {
110 /*
111 * The IDX stream is only used internally, and can
112 * only be indirectly unclaimed by unclaiming the MPG stream.
113 */
114 return;
115 }
116
117 if (s->type == CX18_ENC_STREAM_TYPE_VBI &&
118 test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags)) {
119 /* this stream is still in use internally */
120 return;
121 }
122 if (!test_and_clear_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
123 CX18_DEBUG_WARN("Release stream %s not in use!\n", s->name);
124 return;
125 }
126
127 cx18_flush_queues(s);
128
129 /*
130 * CX18_ENC_STREAM_TYPE_MPG needs to release the
131 * CX18_ENC_STREAM_TYPE_VBI and/or CX18_ENC_STREAM_TYPE_IDX streams.
132 *
133 * For all other streams we're done.
134 */
135 if (s->type != CX18_ENC_STREAM_TYPE_MPG)
136 return;
137
138 /* Unclaim the associated MPEG Index stream */
139 s_assoc = &cx->streams[CX18_ENC_STREAM_TYPE_IDX];
140 if (test_and_clear_bit(CX18_F_S_INTERNAL_USE, &s_assoc->s_flags)) {
141 clear_bit(CX18_F_S_CLAIMED, &s_assoc->s_flags);
142 cx18_flush_queues(s_assoc);
143 }
144
145 /* Unclaim the associated VBI stream */
146 s_assoc = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
147 if (test_and_clear_bit(CX18_F_S_INTERNAL_USE, &s_assoc->s_flags)) {
148 if (s_assoc->id == -1) {
149 /*
150 * The VBI stream is not still claimed by a file
151 * descriptor, so completely unclaim it.
152 */
153 clear_bit(CX18_F_S_CLAIMED, &s_assoc->s_flags);
154 cx18_flush_queues(s_assoc);
155 }
156 }
157}
158EXPORT_SYMBOL(cx18_release_stream);
159
160static void cx18_dualwatch(struct cx18 *cx)
161{
162 struct v4l2_tuner vt;
163 u32 new_stereo_mode;
164 const u32 dual = 0x0200;
165
166 new_stereo_mode = v4l2_ctrl_g_ctrl(cx->cxhdl.audio_mode);
167 memset(&vt, 0, sizeof(vt));
168 cx18_call_all(cx, tuner, g_tuner, &vt);
169 if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 &&
170 (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
171 new_stereo_mode = dual;
172
173 if (new_stereo_mode == cx->dualwatch_stereo_mode)
174 return;
175
176 CX18_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x.\n",
177 cx->dualwatch_stereo_mode, new_stereo_mode);
178 if (v4l2_ctrl_s_ctrl(cx->cxhdl.audio_mode, new_stereo_mode))
179 CX18_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
180}
181
182
183static struct cx18_mdl *cx18_get_mdl(struct cx18_stream *s, int non_block,
184 int *err)
185{
186 struct cx18 *cx = s->cx;
187 struct cx18_stream *s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
188 struct cx18_mdl *mdl;
189 DEFINE_WAIT(wait);
190
191 *err = 0;
192 while (1) {
193 if (s->type == CX18_ENC_STREAM_TYPE_MPG) {
194 /* Process pending program updates and VBI data */
195 if (time_after(jiffies, cx->dualwatch_jiffies + msecs_to_jiffies(1000))) {
196 cx->dualwatch_jiffies = jiffies;
197 cx18_dualwatch(cx);
198 }
199 if (test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
200 !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
201 while ((mdl = cx18_dequeue(s_vbi,
202 &s_vbi->q_full))) {
203 /* byteswap and process VBI data */
204 cx18_process_vbi_data(cx, mdl,
205 s_vbi->type);
206 cx18_stream_put_mdl_fw(s_vbi, mdl);
207 }
208 }
209 mdl = &cx->vbi.sliced_mpeg_mdl;
210 if (mdl->readpos != mdl->bytesused)
211 return mdl;
212 }
213
214 /* do we have new data? */
215 mdl = cx18_dequeue(s, &s->q_full);
216 if (mdl) {
217 if (!test_and_clear_bit(CX18_F_M_NEED_SWAP,
218 &mdl->m_flags))
219 return mdl;
220 if (s->type == CX18_ENC_STREAM_TYPE_MPG)
221 /* byteswap MPG data */
222 cx18_mdl_swap(mdl);
223 else {
224 /* byteswap and process VBI data */
225 cx18_process_vbi_data(cx, mdl, s->type);
226 }
227 return mdl;
228 }
229
230 /* return if end of stream */
231 if (!test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
232 CX18_DEBUG_INFO("EOS %s\n", s->name);
233 return NULL;
234 }
235
236 /* return if file was opened with O_NONBLOCK */
237 if (non_block) {
238 *err = -EAGAIN;
239 return NULL;
240 }
241
242 /* wait for more data to arrive */
243 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
244 /* New buffers might have become available before we were added
245 to the waitqueue */
246 if (!atomic_read(&s->q_full.depth))
247 schedule();
248 finish_wait(&s->waitq, &wait);
249 if (signal_pending(current)) {
250 /* return if a signal was received */
251 CX18_DEBUG_INFO("User stopped %s\n", s->name);
252 *err = -EINTR;
253 return NULL;
254 }
255 }
256}
257
258static void cx18_setup_sliced_vbi_mdl(struct cx18 *cx)
259{
260 struct cx18_mdl *mdl = &cx->vbi.sliced_mpeg_mdl;
261 struct cx18_buffer *buf = &cx->vbi.sliced_mpeg_buf;
262 int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
263
264 buf->buf = cx->vbi.sliced_mpeg_data[idx];
265 buf->bytesused = cx->vbi.sliced_mpeg_size[idx];
266 buf->readpos = 0;
267
268 mdl->curr_buf = NULL;
269 mdl->bytesused = cx->vbi.sliced_mpeg_size[idx];
270 mdl->readpos = 0;
271}
272
273static size_t cx18_copy_buf_to_user(struct cx18_stream *s,
274 struct cx18_buffer *buf, char __user *ubuf, size_t ucount, bool *stop)
275{
276 struct cx18 *cx = s->cx;
277 size_t len = buf->bytesused - buf->readpos;
278
279 *stop = false;
280 if (len > ucount)
281 len = ucount;
282 if (cx->vbi.insert_mpeg && s->type == CX18_ENC_STREAM_TYPE_MPG &&
283 !cx18_raw_vbi(cx) && buf != &cx->vbi.sliced_mpeg_buf) {
284 /*
285 * Try to find a good splice point in the PS, just before
286 * an MPEG-2 Program Pack start code, and provide only
287 * up to that point to the user, so it's easy to insert VBI data
288 * the next time around.
289 *
290 * This will not work for an MPEG-2 TS and has only been
291 * verified by analysis to work for an MPEG-2 PS. Helen Buus
292 * pointed out this works for the CX23416 MPEG-2 DVD compatible
293 * stream, and research indicates both the MPEG 2 SVCD and DVD
294 * stream types use an MPEG-2 PS container.
295 */
296 /*
297 * An MPEG-2 Program Stream (PS) is a series of
298 * MPEG-2 Program Packs terminated by an
299 * MPEG Program End Code after the last Program Pack.
300 * A Program Pack may hold a PS System Header packet and any
301 * number of Program Elementary Stream (PES) Packets
302 */
303 const char *start = buf->buf + buf->readpos;
304 const char *p = start + 1;
305 const u8 *q;
306 u8 ch = cx->search_pack_header ? 0xba : 0xe0;
307 int stuffing, i;
308
309 while (start + len > p) {
310 /* Scan for a 0 to find a potential MPEG-2 start code */
311 q = memchr(p, 0, start + len - p);
312 if (q == NULL)
313 break;
314 p = q + 1;
315 /*
316 * Keep looking if not a
317 * MPEG-2 Pack header start code: 0x00 0x00 0x01 0xba
318 * or MPEG-2 video PES start code: 0x00 0x00 0x01 0xe0
319 */
320 if ((char *)q + 15 >= buf->buf + buf->bytesused ||
321 q[1] != 0 || q[2] != 1 || q[3] != ch)
322 continue;
323
324 /* If expecting the primary video PES */
325 if (!cx->search_pack_header) {
326 /* Continue if it couldn't be a PES packet */
327 if ((q[6] & 0xc0) != 0x80)
328 continue;
329 /* Check if a PTS or PTS & DTS follow */
330 if (((q[7] & 0xc0) == 0x80 && /* PTS only */
331 (q[9] & 0xf0) == 0x20) || /* PTS only */
332 ((q[7] & 0xc0) == 0xc0 && /* PTS & DTS */
333 (q[9] & 0xf0) == 0x30)) { /* DTS follows */
334 /* Assume we found the video PES hdr */
335 ch = 0xba; /* next want a Program Pack*/
336 cx->search_pack_header = 1;
337 p = q + 9; /* Skip this video PES hdr */
338 }
339 continue;
340 }
341
342 /* We may have found a Program Pack start code */
343
344 /* Get the count of stuffing bytes & verify them */
345 stuffing = q[13] & 7;
346 /* all stuffing bytes must be 0xff */
347 for (i = 0; i < stuffing; i++)
348 if (q[14 + i] != 0xff)
349 break;
350 if (i == stuffing && /* right number of stuffing bytes*/
351 (q[4] & 0xc4) == 0x44 && /* marker check */
352 (q[12] & 3) == 3 && /* marker check */
353 q[14 + stuffing] == 0 && /* PES Pack or Sys Hdr */
354 q[15 + stuffing] == 0 &&
355 q[16 + stuffing] == 1) {
356 /* We declare we actually found a Program Pack*/
357 cx->search_pack_header = 0; /* expect vid PES */
358 len = (char *)q - start;
359 cx18_setup_sliced_vbi_mdl(cx);
360 *stop = true;
361 break;
362 }
363 }
364 }
365 if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
366 CX18_DEBUG_WARN("copy %zd bytes to user failed for %s\n",
367 len, s->name);
368 return -EFAULT;
369 }
370 buf->readpos += len;
371 if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
372 buf != &cx->vbi.sliced_mpeg_buf)
373 cx->mpg_data_received += len;
374 return len;
375}
376
377static size_t cx18_copy_mdl_to_user(struct cx18_stream *s,
378 struct cx18_mdl *mdl, char __user *ubuf, size_t ucount)
379{
380 size_t tot_written = 0;
381 int rc;
382 bool stop = false;
383
384 if (mdl->curr_buf == NULL)
385 mdl->curr_buf = list_first_entry(&mdl->buf_list,
386 struct cx18_buffer, list);
387
388 if (list_entry_is_past_end(mdl->curr_buf, &mdl->buf_list, list)) {
389 /*
390 * For some reason we've exhausted the buffers, but the MDL
391 * object still said some data was unread.
392 * Fix that and bail out.
393 */
394 mdl->readpos = mdl->bytesused;
395 return 0;
396 }
397
398 list_for_each_entry_from(mdl->curr_buf, &mdl->buf_list, list) {
399
400 if (mdl->curr_buf->readpos >= mdl->curr_buf->bytesused)
401 continue;
402
403 rc = cx18_copy_buf_to_user(s, mdl->curr_buf, ubuf + tot_written,
404 ucount - tot_written, &stop);
405 if (rc < 0)
406 return rc;
407 mdl->readpos += rc;
408 tot_written += rc;
409
410 if (stop || /* Forced stopping point for VBI insertion */
411 tot_written >= ucount || /* Reader request statisfied */
412 mdl->curr_buf->readpos < mdl->curr_buf->bytesused ||
413 mdl->readpos >= mdl->bytesused) /* MDL buffers drained */
414 break;
415 }
416 return tot_written;
417}
418
419static ssize_t cx18_read(struct cx18_stream *s, char __user *ubuf,
420 size_t tot_count, int non_block)
421{
422 struct cx18 *cx = s->cx;
423 size_t tot_written = 0;
424 int single_frame = 0;
425
426 if (atomic_read(&cx->ana_capturing) == 0 && s->id == -1) {
427 /* shouldn't happen */
428 CX18_DEBUG_WARN("Stream %s not initialized before read\n",
429 s->name);
430 return -EIO;
431 }
432
433 /* Each VBI buffer is one frame, the v4l2 API says that for VBI the
434 frames should arrive one-by-one, so make sure we never output more
435 than one VBI frame at a time */
436 if (s->type == CX18_ENC_STREAM_TYPE_VBI && !cx18_raw_vbi(cx))
437 single_frame = 1;
438
439 for (;;) {
440 struct cx18_mdl *mdl;
441 int rc;
442
443 mdl = cx18_get_mdl(s, non_block, &rc);
444 /* if there is no data available... */
445 if (mdl == NULL) {
446 /* if we got data, then return that regardless */
447 if (tot_written)
448 break;
449 /* EOS condition */
450 if (rc == 0) {
451 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
452 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
453 cx18_release_stream(s);
454 }
455 /* set errno */
456 return rc;
457 }
458
459 rc = cx18_copy_mdl_to_user(s, mdl, ubuf + tot_written,
460 tot_count - tot_written);
461
462 if (mdl != &cx->vbi.sliced_mpeg_mdl) {
463 if (mdl->readpos == mdl->bytesused)
464 cx18_stream_put_mdl_fw(s, mdl);
465 else
466 cx18_push(s, mdl, &s->q_full);
467 } else if (mdl->readpos == mdl->bytesused) {
468 int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
469
470 cx->vbi.sliced_mpeg_size[idx] = 0;
471 cx->vbi.inserted_frame++;
472 cx->vbi_data_inserted += mdl->bytesused;
473 }
474 if (rc < 0)
475 return rc;
476 tot_written += rc;
477
478 if (tot_written == tot_count || single_frame)
479 break;
480 }
481 return tot_written;
482}
483
484static ssize_t cx18_read_pos(struct cx18_stream *s, char __user *ubuf,
485 size_t count, loff_t *pos, int non_block)
486{
487 ssize_t rc = count ? cx18_read(s, ubuf, count, non_block) : 0;
488 struct cx18 *cx = s->cx;
489
490 CX18_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
491 if (rc > 0)
492 pos += rc;
493 return rc;
494}
495
496int cx18_start_capture(struct cx18_open_id *id)
497{
498 struct cx18 *cx = id->cx;
499 struct cx18_stream *s = &cx->streams[id->type];
500 struct cx18_stream *s_vbi;
501 struct cx18_stream *s_idx;
502
503 if (s->type == CX18_ENC_STREAM_TYPE_RAD) {
504 /* you cannot read from these stream types. */
505 return -EPERM;
506 }
507
508 /* Try to claim this stream. */
509 if (cx18_claim_stream(id, s->type))
510 return -EBUSY;
511
512 /* If capture is already in progress, then we also have to
513 do nothing extra. */
514 if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) ||
515 test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
516 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
517 return 0;
518 }
519
520 /* Start associated VBI or IDX stream capture if required */
521 s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
522 s_idx = &cx->streams[CX18_ENC_STREAM_TYPE_IDX];
523 if (s->type == CX18_ENC_STREAM_TYPE_MPG) {
524 /*
525 * The VBI and IDX streams should have been claimed
526 * automatically, if for internal use, when the MPG stream was
527 * claimed. We only need to start these streams capturing.
528 */
529 if (test_bit(CX18_F_S_INTERNAL_USE, &s_idx->s_flags) &&
530 !test_and_set_bit(CX18_F_S_STREAMING, &s_idx->s_flags)) {
531 if (cx18_start_v4l2_encode_stream(s_idx)) {
532 CX18_DEBUG_WARN("IDX capture start failed\n");
533 clear_bit(CX18_F_S_STREAMING, &s_idx->s_flags);
534 goto start_failed;
535 }
536 CX18_DEBUG_INFO("IDX capture started\n");
537 }
538 if (test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
539 !test_and_set_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
540 if (cx18_start_v4l2_encode_stream(s_vbi)) {
541 CX18_DEBUG_WARN("VBI capture start failed\n");
542 clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
543 goto start_failed;
544 }
545 CX18_DEBUG_INFO("VBI insertion started\n");
546 }
547 }
548
549 /* Tell the card to start capturing */
550 if (!cx18_start_v4l2_encode_stream(s)) {
551 /* We're done */
552 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
553 /* Resume a possibly paused encoder */
554 if (test_and_clear_bit(CX18_F_I_ENC_PAUSED, &cx->i_flags))
555 cx18_vapi(cx, CX18_CPU_CAPTURE_PAUSE, 1, s->handle);
556 return 0;
557 }
558
559start_failed:
560 CX18_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
561
562 /*
563 * The associated VBI and IDX streams for internal use are released
564 * automatically when the MPG stream is released. We only need to stop
565 * the associated stream.
566 */
567 if (s->type == CX18_ENC_STREAM_TYPE_MPG) {
568 /* Stop the IDX stream which is always for internal use */
569 if (test_bit(CX18_F_S_STREAMING, &s_idx->s_flags)) {
570 cx18_stop_v4l2_encode_stream(s_idx, 0);
571 clear_bit(CX18_F_S_STREAMING, &s_idx->s_flags);
572 }
573 /* Stop the VBI stream, if only running for internal use */
574 if (test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags) &&
575 !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
576 cx18_stop_v4l2_encode_stream(s_vbi, 0);
577 clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
578 }
579 }
580 clear_bit(CX18_F_S_STREAMING, &s->s_flags);
581 cx18_release_stream(s); /* Also releases associated streams */
582 return -EIO;
583}
584
585ssize_t cx18_v4l2_read(struct file *filp, char __user *buf, size_t count,
586 loff_t *pos)
587{
588 struct cx18_open_id *id = file2id(filp);
589 struct cx18 *cx = id->cx;
590 struct cx18_stream *s = &cx->streams[id->type];
591 int rc;
592
593 CX18_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
594
595 mutex_lock(&cx->serialize_lock);
596 rc = cx18_start_capture(id);
597 mutex_unlock(&cx->serialize_lock);
598 if (rc)
599 return rc;
600
601 if ((s->vb_type == V4L2_BUF_TYPE_VIDEO_CAPTURE) &&
602 (id->type == CX18_ENC_STREAM_TYPE_YUV)) {
603 return videobuf_read_stream(&s->vbuf_q, buf, count, pos, 0,
604 filp->f_flags & O_NONBLOCK);
605 }
606
607 return cx18_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
608}
609
610unsigned int cx18_v4l2_enc_poll(struct file *filp, poll_table *wait)
611{
612 struct cx18_open_id *id = file2id(filp);
613 struct cx18 *cx = id->cx;
614 struct cx18_stream *s = &cx->streams[id->type];
615 int eof = test_bit(CX18_F_S_STREAMOFF, &s->s_flags);
616
617 /* Start a capture if there is none */
618 if (!eof && !test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
619 int rc;
620
621 mutex_lock(&cx->serialize_lock);
622 rc = cx18_start_capture(id);
623 mutex_unlock(&cx->serialize_lock);
624 if (rc) {
625 CX18_DEBUG_INFO("Could not start capture for %s (%d)\n",
626 s->name, rc);
627 return POLLERR;
628 }
629 CX18_DEBUG_FILE("Encoder poll started capture\n");
630 }
631
632 if ((s->vb_type == V4L2_BUF_TYPE_VIDEO_CAPTURE) &&
633 (id->type == CX18_ENC_STREAM_TYPE_YUV)) {
634 int videobuf_poll = videobuf_poll_stream(filp, &s->vbuf_q, wait);
635 if (eof && videobuf_poll == POLLERR)
636 return POLLHUP;
637 else
638 return videobuf_poll;
639 }
640
641 /* add stream's waitq to the poll list */
642 CX18_DEBUG_HI_FILE("Encoder poll\n");
643 poll_wait(filp, &s->waitq, wait);
644
645 if (atomic_read(&s->q_full.depth))
646 return POLLIN | POLLRDNORM;
647 if (eof)
648 return POLLHUP;
649 return 0;
650}
651
652int cx18_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
653{
654 struct cx18_open_id *id = file->private_data;
655 struct cx18 *cx = id->cx;
656 struct cx18_stream *s = &cx->streams[id->type];
657 int eof = test_bit(CX18_F_S_STREAMOFF, &s->s_flags);
658
659 if ((s->vb_type == V4L2_BUF_TYPE_VIDEO_CAPTURE) &&
660 (id->type == CX18_ENC_STREAM_TYPE_YUV)) {
661
662 /* Start a capture if there is none */
663 if (!eof && !test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
664 int rc;
665
666 mutex_lock(&cx->serialize_lock);
667 rc = cx18_start_capture(id);
668 mutex_unlock(&cx->serialize_lock);
669 if (rc) {
670 CX18_DEBUG_INFO(
671 "Could not start capture for %s (%d)\n",
672 s->name, rc);
673 return -EINVAL;
674 }
675 CX18_DEBUG_FILE("Encoder mmap started capture\n");
676 }
677
678 return videobuf_mmap_mapper(&s->vbuf_q, vma);
679 }
680
681 return -EINVAL;
682}
683
684void cx18_vb_timeout(unsigned long data)
685{
686 struct cx18_stream *s = (struct cx18_stream *)data;
687 struct cx18_videobuf_buffer *buf;
688 unsigned long flags;
689
690 /* Return all of the buffers in error state, so the vbi/vid inode
691 * can return from blocking.
692 */
693 spin_lock_irqsave(&s->vb_lock, flags);
694 while (!list_empty(&s->vb_capture)) {
695 buf = list_entry(s->vb_capture.next,
696 struct cx18_videobuf_buffer, vb.queue);
697 list_del(&buf->vb.queue);
698 buf->vb.state = VIDEOBUF_ERROR;
699 wake_up(&buf->vb.done);
700 }
701 spin_unlock_irqrestore(&s->vb_lock, flags);
702}
703
704void cx18_stop_capture(struct cx18_open_id *id, int gop_end)
705{
706 struct cx18 *cx = id->cx;
707 struct cx18_stream *s = &cx->streams[id->type];
708 struct cx18_stream *s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
709 struct cx18_stream *s_idx = &cx->streams[CX18_ENC_STREAM_TYPE_IDX];
710
711 CX18_DEBUG_IOCTL("close() of %s\n", s->name);
712
713 /* 'Unclaim' this stream */
714
715 /* Stop capturing */
716 if (test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
717 CX18_DEBUG_INFO("close stopping capture\n");
718 if (id->type == CX18_ENC_STREAM_TYPE_MPG) {
719 /* Stop internal use associated VBI and IDX streams */
720 if (test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags) &&
721 !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
722 CX18_DEBUG_INFO("close stopping embedded VBI "
723 "capture\n");
724 cx18_stop_v4l2_encode_stream(s_vbi, 0);
725 }
726 if (test_bit(CX18_F_S_STREAMING, &s_idx->s_flags)) {
727 CX18_DEBUG_INFO("close stopping IDX capture\n");
728 cx18_stop_v4l2_encode_stream(s_idx, 0);
729 }
730 }
731 if (id->type == CX18_ENC_STREAM_TYPE_VBI &&
732 test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags))
733 /* Also used internally, don't stop capturing */
734 s->id = -1;
735 else
736 cx18_stop_v4l2_encode_stream(s, gop_end);
737 }
738 if (!gop_end) {
739 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
740 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
741 cx18_release_stream(s);
742 }
743}
744
745int cx18_v4l2_close(struct file *filp)
746{
747 struct v4l2_fh *fh = filp->private_data;
748 struct cx18_open_id *id = fh2id(fh);
749 struct cx18 *cx = id->cx;
750 struct cx18_stream *s = &cx->streams[id->type];
751
752 CX18_DEBUG_IOCTL("close() of %s\n", s->name);
753
754 v4l2_fh_del(fh);
755 v4l2_fh_exit(fh);
756
757 /* Easy case first: this stream was never claimed by us */
758 if (s->id != id->open_id) {
759 kfree(id);
760 return 0;
761 }
762
763 /* 'Unclaim' this stream */
764
765 /* Stop radio */
766 mutex_lock(&cx->serialize_lock);
767 if (id->type == CX18_ENC_STREAM_TYPE_RAD) {
768 /* Closing radio device, return to TV mode */
769 cx18_mute(cx);
770 /* Mark that the radio is no longer in use */
771 clear_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
772 /* Switch tuner to TV */
773 cx18_call_all(cx, core, s_std, cx->std);
774 /* Select correct audio input (i.e. TV tuner or Line in) */
775 cx18_audio_set_io(cx);
776 if (atomic_read(&cx->ana_capturing) > 0) {
777 /* Undo video mute */
778 cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2, s->handle,
779 (v4l2_ctrl_g_ctrl(cx->cxhdl.video_mute) |
780 (v4l2_ctrl_g_ctrl(cx->cxhdl.video_mute_yuv) << 8)));
781 }
782 /* Done! Unmute and continue. */
783 cx18_unmute(cx);
784 cx18_release_stream(s);
785 } else {
786 cx18_stop_capture(id, 0);
787 if (id->type == CX18_ENC_STREAM_TYPE_YUV)
788 videobuf_mmap_free(&id->vbuf_q);
789 }
790 kfree(id);
791 mutex_unlock(&cx->serialize_lock);
792 return 0;
793}
794
795static int cx18_serialized_open(struct cx18_stream *s, struct file *filp)
796{
797 struct cx18 *cx = s->cx;
798 struct cx18_open_id *item;
799
800 CX18_DEBUG_FILE("open %s\n", s->name);
801
802 /* Allocate memory */
803 item = kzalloc(sizeof(struct cx18_open_id), GFP_KERNEL);
804 if (NULL == item) {
805 CX18_DEBUG_WARN("nomem on v4l2 open\n");
806 return -ENOMEM;
807 }
808 v4l2_fh_init(&item->fh, s->video_dev);
809
810 item->cx = cx;
811 item->type = s->type;
812
813 item->open_id = cx->open_id++;
814 filp->private_data = &item->fh;
815
816 if (item->type == CX18_ENC_STREAM_TYPE_RAD) {
817 /* Try to claim this stream */
818 if (cx18_claim_stream(item, item->type)) {
819 /* No, it's already in use */
820 v4l2_fh_exit(&item->fh);
821 kfree(item);
822 return -EBUSY;
823 }
824
825 if (!test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) {
826 if (atomic_read(&cx->ana_capturing) > 0) {
827 /* switching to radio while capture is
828 in progress is not polite */
829 cx18_release_stream(s);
830 v4l2_fh_exit(&item->fh);
831 kfree(item);
832 return -EBUSY;
833 }
834 }
835
836 /* Mark that the radio is being used. */
837 set_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
838 /* We have the radio */
839 cx18_mute(cx);
840 /* Switch tuner to radio */
841 cx18_call_all(cx, tuner, s_radio);
842 /* Select the correct audio input (i.e. radio tuner) */
843 cx18_audio_set_io(cx);
844 /* Done! Unmute and continue. */
845 cx18_unmute(cx);
846 }
847 v4l2_fh_add(&item->fh);
848 return 0;
849}
850
851int cx18_v4l2_open(struct file *filp)
852{
853 int res;
854 struct video_device *video_dev = video_devdata(filp);
855 struct cx18_stream *s = video_get_drvdata(video_dev);
856 struct cx18 *cx = s->cx;
857
858 mutex_lock(&cx->serialize_lock);
859 if (cx18_init_on_first_open(cx)) {
860 CX18_ERR("Failed to initialize on %s\n",
861 video_device_node_name(video_dev));
862 mutex_unlock(&cx->serialize_lock);
863 return -ENXIO;
864 }
865 res = cx18_serialized_open(s, filp);
866 mutex_unlock(&cx->serialize_lock);
867 return res;
868}
869
870void cx18_mute(struct cx18 *cx)
871{
872 u32 h;
873 if (atomic_read(&cx->ana_capturing)) {
874 h = cx18_find_handle(cx);
875 if (h != CX18_INVALID_TASK_HANDLE)
876 cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 1);
877 else
878 CX18_ERR("Can't find valid task handle for mute\n");
879 }
880 CX18_DEBUG_INFO("Mute\n");
881}
882
883void cx18_unmute(struct cx18 *cx)
884{
885 u32 h;
886 if (atomic_read(&cx->ana_capturing)) {
887 h = cx18_find_handle(cx);
888 if (h != CX18_INVALID_TASK_HANDLE) {
889 cx18_msleep_timeout(100, 0);
890 cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2, h, 12);
891 cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 0);
892 } else
893 CX18_ERR("Can't find valid task handle for unmute\n");
894 }
895 CX18_DEBUG_INFO("Unmute\n");
896}
generated by cgit v1.2.2 (git 2.25.0) at 2025-03-20 22:47:34 -0400