Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-2.6
[linux-2.6] / drivers / media / video / cx18 / cx18-fileops.c
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@radix.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 streams are also automatically claimed.
41    Possible error returns: -EBUSY if someone else has claimed
42    the stream or 0 on success. */
43 static int 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_vbi;
48         int vbi_type;
49
50         if (test_and_set_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
51                 /* someone already claimed this stream */
52                 if (s->id == id->open_id) {
53                         /* yes, this file descriptor did. So that's OK. */
54                         return 0;
55                 }
56                 if (s->id == -1 && type == CX18_ENC_STREAM_TYPE_VBI) {
57                         /* VBI is handled already internally, now also assign
58                            the file descriptor to this stream for external
59                            reading of the stream. */
60                         s->id = id->open_id;
61                         CX18_DEBUG_INFO("Start Read VBI\n");
62                         return 0;
63                 }
64                 /* someone else is using this stream already */
65                 CX18_DEBUG_INFO("Stream %d is busy\n", type);
66                 return -EBUSY;
67         }
68         s->id = id->open_id;
69
70         /* CX18_ENC_STREAM_TYPE_MPG needs to claim CX18_ENC_STREAM_TYPE_VBI
71            (provided VBI insertion is on and sliced VBI is selected), for all
72            other streams we're done */
73         if (type == CX18_ENC_STREAM_TYPE_MPG &&
74             cx->vbi.insert_mpeg && !cx18_raw_vbi(cx)) {
75                 vbi_type = CX18_ENC_STREAM_TYPE_VBI;
76         } else {
77                 return 0;
78         }
79         s_vbi = &cx->streams[vbi_type];
80
81         set_bit(CX18_F_S_CLAIMED, &s_vbi->s_flags);
82
83         /* mark that it is used internally */
84         set_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags);
85         return 0;
86 }
87
88 /* This function releases a previously claimed stream. It will take into
89    account associated VBI streams. */
90 static void cx18_release_stream(struct cx18_stream *s)
91 {
92         struct cx18 *cx = s->cx;
93         struct cx18_stream *s_vbi;
94
95         s->id = -1;
96         if (s->type == CX18_ENC_STREAM_TYPE_VBI &&
97                 test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags)) {
98                 /* this stream is still in use internally */
99                 return;
100         }
101         if (!test_and_clear_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
102                 CX18_DEBUG_WARN("Release stream %s not in use!\n", s->name);
103                 return;
104         }
105
106         cx18_flush_queues(s);
107
108         /* CX18_ENC_STREAM_TYPE_MPG needs to release CX18_ENC_STREAM_TYPE_VBI,
109            for all other streams we're done */
110         if (s->type == CX18_ENC_STREAM_TYPE_MPG)
111                 s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
112         else
113                 return;
114
115         /* clear internal use flag */
116         if (!test_and_clear_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
117                 /* was already cleared */
118                 return;
119         }
120         if (s_vbi->id != -1) {
121                 /* VBI stream still claimed by a file descriptor */
122                 return;
123         }
124         clear_bit(CX18_F_S_CLAIMED, &s_vbi->s_flags);
125         cx18_flush_queues(s_vbi);
126 }
127
128 static void cx18_dualwatch(struct cx18 *cx)
129 {
130         struct v4l2_tuner vt;
131         u32 new_bitmap;
132         u32 new_stereo_mode;
133         const u32 stereo_mask = 0x0300;
134         const u32 dual = 0x0200;
135         u32 h;
136
137         new_stereo_mode = cx->params.audio_properties & stereo_mask;
138         memset(&vt, 0, sizeof(vt));
139         cx18_call_all(cx, tuner, g_tuner, &vt);
140         if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 &&
141                         (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
142                 new_stereo_mode = dual;
143
144         if (new_stereo_mode == cx->dualwatch_stereo_mode)
145                 return;
146
147         new_bitmap = new_stereo_mode
148                         | (cx->params.audio_properties & ~stereo_mask);
149
150         CX18_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x. "
151                         "new audio_bitmask=0x%ux\n",
152                         cx->dualwatch_stereo_mode, new_stereo_mode, new_bitmap);
153
154         h = cx18_find_handle(cx);
155         if (h == CX18_INVALID_TASK_HANDLE) {
156                 CX18_DEBUG_INFO("dualwatch: can't find valid task handle\n");
157                 return;
158         }
159
160         if (cx18_vapi(cx,
161                       CX18_CPU_SET_AUDIO_PARAMETERS, 2, h, new_bitmap) == 0) {
162                 cx->dualwatch_stereo_mode = new_stereo_mode;
163                 return;
164         }
165         CX18_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
166 }
167
168
169 static struct cx18_buffer *cx18_get_buffer(struct cx18_stream *s, int non_block, int *err)
170 {
171         struct cx18 *cx = s->cx;
172         struct cx18_stream *s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
173         struct cx18_buffer *buf;
174         DEFINE_WAIT(wait);
175
176         *err = 0;
177         while (1) {
178                 if (s->type == CX18_ENC_STREAM_TYPE_MPG) {
179                         /* Process pending program info updates and pending
180                            VBI data */
181
182                         if (time_after(jiffies, cx->dualwatch_jiffies + msecs_to_jiffies(1000))) {
183                                 cx->dualwatch_jiffies = jiffies;
184                                 cx18_dualwatch(cx);
185                         }
186                         if (test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
187                             !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
188                                 while ((buf = cx18_dequeue(s_vbi, &s_vbi->q_full))) {
189                                         /* byteswap and process VBI data */
190                                         cx18_process_vbi_data(cx, buf,
191                                                               s_vbi->type);
192                                         cx18_stream_put_buf_fw(s_vbi, buf);
193                                 }
194                         }
195                         buf = &cx->vbi.sliced_mpeg_buf;
196                         if (buf->readpos != buf->bytesused)
197                                 return buf;
198                 }
199
200                 /* do we have new data? */
201                 buf = cx18_dequeue(s, &s->q_full);
202                 if (buf) {
203                         if (!test_and_clear_bit(CX18_F_B_NEED_BUF_SWAP,
204                                                 &buf->b_flags))
205                                 return buf;
206                         if (s->type == CX18_ENC_STREAM_TYPE_MPG)
207                                 /* byteswap MPG data */
208                                 cx18_buf_swap(buf);
209                         else {
210                                 /* byteswap and process VBI data */
211                                 cx18_process_vbi_data(cx, buf, s->type);
212                         }
213                         return buf;
214                 }
215
216                 /* return if end of stream */
217                 if (!test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
218                         CX18_DEBUG_INFO("EOS %s\n", s->name);
219                         return NULL;
220                 }
221
222                 /* return if file was opened with O_NONBLOCK */
223                 if (non_block) {
224                         *err = -EAGAIN;
225                         return NULL;
226                 }
227
228                 /* wait for more data to arrive */
229                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
230                 /* New buffers might have become available before we were added
231                    to the waitqueue */
232                 if (!atomic_read(&s->q_full.buffers))
233                         schedule();
234                 finish_wait(&s->waitq, &wait);
235                 if (signal_pending(current)) {
236                         /* return if a signal was received */
237                         CX18_DEBUG_INFO("User stopped %s\n", s->name);
238                         *err = -EINTR;
239                         return NULL;
240                 }
241         }
242 }
243
244 static void cx18_setup_sliced_vbi_buf(struct cx18 *cx)
245 {
246         int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
247
248         cx->vbi.sliced_mpeg_buf.buf = cx->vbi.sliced_mpeg_data[idx];
249         cx->vbi.sliced_mpeg_buf.bytesused = cx->vbi.sliced_mpeg_size[idx];
250         cx->vbi.sliced_mpeg_buf.readpos = 0;
251 }
252
253 static size_t cx18_copy_buf_to_user(struct cx18_stream *s,
254                 struct cx18_buffer *buf, char __user *ubuf, size_t ucount)
255 {
256         struct cx18 *cx = s->cx;
257         size_t len = buf->bytesused - buf->readpos;
258
259         if (len > ucount)
260                 len = ucount;
261         if (cx->vbi.insert_mpeg && s->type == CX18_ENC_STREAM_TYPE_MPG &&
262             !cx18_raw_vbi(cx) && buf != &cx->vbi.sliced_mpeg_buf) {
263                 /*
264                  * Try to find a good splice point in the PS, just before
265                  * an MPEG-2 Program Pack start code, and provide only
266                  * up to that point to the user, so it's easy to insert VBI data
267                  * the next time around.
268                  */
269                 /* FIXME - This only works for an MPEG-2 PS, not a TS */
270                 /*
271                  * An MPEG-2 Program Stream (PS) is a series of
272                  * MPEG-2 Program Packs terminated by an
273                  * MPEG Program End Code after the last Program Pack.
274                  * A Program Pack may hold a PS System Header packet and any
275                  * number of Program Elementary Stream (PES) Packets
276                  */
277                 const char *start = buf->buf + buf->readpos;
278                 const char *p = start + 1;
279                 const u8 *q;
280                 u8 ch = cx->search_pack_header ? 0xba : 0xe0;
281                 int stuffing, i;
282
283                 while (start + len > p) {
284                         /* Scan for a 0 to find a potential MPEG-2 start code */
285                         q = memchr(p, 0, start + len - p);
286                         if (q == NULL)
287                                 break;
288                         p = q + 1;
289                         /*
290                          * Keep looking if not a
291                          * MPEG-2 Pack header start code:  0x00 0x00 0x01 0xba
292                          * or MPEG-2 video PES start code: 0x00 0x00 0x01 0xe0
293                          */
294                         if ((char *)q + 15 >= buf->buf + buf->bytesused ||
295                             q[1] != 0 || q[2] != 1 || q[3] != ch)
296                                 continue;
297
298                         /* If expecting the primary video PES */
299                         if (!cx->search_pack_header) {
300                                 /* Continue if it couldn't be a PES packet */
301                                 if ((q[6] & 0xc0) != 0x80)
302                                         continue;
303                                 /* Check if a PTS or PTS & DTS follow */
304                                 if (((q[7] & 0xc0) == 0x80 &&  /* PTS only */
305                                      (q[9] & 0xf0) == 0x20) || /* PTS only */
306                                     ((q[7] & 0xc0) == 0xc0 &&  /* PTS & DTS */
307                                      (q[9] & 0xf0) == 0x30)) { /* DTS follows */
308                                         /* Assume we found the video PES hdr */
309                                         ch = 0xba; /* next want a Program Pack*/
310                                         cx->search_pack_header = 1;
311                                         p = q + 9; /* Skip this video PES hdr */
312                                 }
313                                 continue;
314                         }
315
316                         /* We may have found a Program Pack start code */
317
318                         /* Get the count of stuffing bytes & verify them */
319                         stuffing = q[13] & 7;
320                         /* all stuffing bytes must be 0xff */
321                         for (i = 0; i < stuffing; i++)
322                                 if (q[14 + i] != 0xff)
323                                         break;
324                         if (i == stuffing && /* right number of stuffing bytes*/
325                             (q[4] & 0xc4) == 0x44 && /* marker check */
326                             (q[12] & 3) == 3 &&  /* marker check */
327                             q[14 + stuffing] == 0 && /* PES Pack or Sys Hdr */
328                             q[15 + stuffing] == 0 &&
329                             q[16 + stuffing] == 1) {
330                                 /* We declare we actually found a Program Pack*/
331                                 cx->search_pack_header = 0; /* expect vid PES */
332                                 len = (char *)q - start;
333                                 cx18_setup_sliced_vbi_buf(cx);
334                                 break;
335                         }
336                 }
337         }
338         if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
339                 CX18_DEBUG_WARN("copy %zd bytes to user failed for %s\n",
340                                 len, s->name);
341                 return -EFAULT;
342         }
343         buf->readpos += len;
344         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
345             buf != &cx->vbi.sliced_mpeg_buf)
346                 cx->mpg_data_received += len;
347         return len;
348 }
349
350 static ssize_t cx18_read(struct cx18_stream *s, char __user *ubuf,
351                 size_t tot_count, int non_block)
352 {
353         struct cx18 *cx = s->cx;
354         size_t tot_written = 0;
355         int single_frame = 0;
356
357         if (atomic_read(&cx->ana_capturing) == 0 && s->id == -1) {
358                 /* shouldn't happen */
359                 CX18_DEBUG_WARN("Stream %s not initialized before read\n",
360                                 s->name);
361                 return -EIO;
362         }
363
364         /* Each VBI buffer is one frame, the v4l2 API says that for VBI the
365            frames should arrive one-by-one, so make sure we never output more
366            than one VBI frame at a time */
367         if (s->type == CX18_ENC_STREAM_TYPE_VBI && !cx18_raw_vbi(cx))
368                 single_frame = 1;
369
370         for (;;) {
371                 struct cx18_buffer *buf;
372                 int rc;
373
374                 buf = cx18_get_buffer(s, non_block, &rc);
375                 /* if there is no data available... */
376                 if (buf == NULL) {
377                         /* if we got data, then return that regardless */
378                         if (tot_written)
379                                 break;
380                         /* EOS condition */
381                         if (rc == 0) {
382                                 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
383                                 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
384                                 cx18_release_stream(s);
385                         }
386                         /* set errno */
387                         return rc;
388                 }
389
390                 rc = cx18_copy_buf_to_user(s, buf, ubuf + tot_written,
391                                 tot_count - tot_written);
392
393                 if (buf != &cx->vbi.sliced_mpeg_buf) {
394                         if (buf->readpos == buf->bytesused)
395                                 cx18_stream_put_buf_fw(s, buf);
396                         else
397                                 cx18_push(s, buf, &s->q_full);
398                 } else if (buf->readpos == buf->bytesused) {
399                         int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
400
401                         cx->vbi.sliced_mpeg_size[idx] = 0;
402                         cx->vbi.inserted_frame++;
403                         cx->vbi_data_inserted += buf->bytesused;
404                 }
405                 if (rc < 0)
406                         return rc;
407                 tot_written += rc;
408
409                 if (tot_written == tot_count || single_frame)
410                         break;
411         }
412         return tot_written;
413 }
414
415 static ssize_t cx18_read_pos(struct cx18_stream *s, char __user *ubuf,
416                 size_t count, loff_t *pos, int non_block)
417 {
418         ssize_t rc = count ? cx18_read(s, ubuf, count, non_block) : 0;
419         struct cx18 *cx = s->cx;
420
421         CX18_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
422         if (rc > 0)
423                 pos += rc;
424         return rc;
425 }
426
427 int cx18_start_capture(struct cx18_open_id *id)
428 {
429         struct cx18 *cx = id->cx;
430         struct cx18_stream *s = &cx->streams[id->type];
431         struct cx18_stream *s_vbi;
432
433         if (s->type == CX18_ENC_STREAM_TYPE_RAD) {
434                 /* you cannot read from these stream types. */
435                 return -EPERM;
436         }
437
438         /* Try to claim this stream. */
439         if (cx18_claim_stream(id, s->type))
440                 return -EBUSY;
441
442         /* If capture is already in progress, then we also have to
443            do nothing extra. */
444         if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) ||
445             test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
446                 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
447                 return 0;
448         }
449
450         /* Start VBI capture if required */
451         s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
452         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
453             test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
454             !test_and_set_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
455                 /* Note: the CX18_ENC_STREAM_TYPE_VBI is claimed
456                    automatically when the MPG stream is claimed.
457                    We only need to start the VBI capturing. */
458                 if (cx18_start_v4l2_encode_stream(s_vbi)) {
459                         CX18_DEBUG_WARN("VBI capture start failed\n");
460
461                         /* Failure, clean up and return an error */
462                         clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
463                         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
464                         /* also releases the associated VBI stream */
465                         cx18_release_stream(s);
466                         return -EIO;
467                 }
468                 CX18_DEBUG_INFO("VBI insertion started\n");
469         }
470
471         /* Tell the card to start capturing */
472         if (!cx18_start_v4l2_encode_stream(s)) {
473                 /* We're done */
474                 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
475                 /* Resume a possibly paused encoder */
476                 if (test_and_clear_bit(CX18_F_I_ENC_PAUSED, &cx->i_flags))
477                         cx18_vapi(cx, CX18_CPU_CAPTURE_PAUSE, 1, s->handle);
478                 return 0;
479         }
480
481         /* failure, clean up */
482         CX18_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
483
484         /* Note: the CX18_ENC_STREAM_TYPE_VBI is released
485            automatically when the MPG stream is released.
486            We only need to stop the VBI capturing. */
487         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
488             test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
489                 cx18_stop_v4l2_encode_stream(s_vbi, 0);
490                 clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
491         }
492         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
493         cx18_release_stream(s);
494         return -EIO;
495 }
496
497 ssize_t cx18_v4l2_read(struct file *filp, char __user *buf, size_t count,
498                 loff_t *pos)
499 {
500         struct cx18_open_id *id = filp->private_data;
501         struct cx18 *cx = id->cx;
502         struct cx18_stream *s = &cx->streams[id->type];
503         int rc;
504
505         CX18_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
506
507         mutex_lock(&cx->serialize_lock);
508         rc = cx18_start_capture(id);
509         mutex_unlock(&cx->serialize_lock);
510         if (rc)
511                 return rc;
512         return cx18_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
513 }
514
515 unsigned int cx18_v4l2_enc_poll(struct file *filp, poll_table *wait)
516 {
517         struct cx18_open_id *id = filp->private_data;
518         struct cx18 *cx = id->cx;
519         struct cx18_stream *s = &cx->streams[id->type];
520         int eof = test_bit(CX18_F_S_STREAMOFF, &s->s_flags);
521
522         /* Start a capture if there is none */
523         if (!eof && !test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
524                 int rc;
525
526                 mutex_lock(&cx->serialize_lock);
527                 rc = cx18_start_capture(id);
528                 mutex_unlock(&cx->serialize_lock);
529                 if (rc) {
530                         CX18_DEBUG_INFO("Could not start capture for %s (%d)\n",
531                                         s->name, rc);
532                         return POLLERR;
533                 }
534                 CX18_DEBUG_FILE("Encoder poll started capture\n");
535         }
536
537         /* add stream's waitq to the poll list */
538         CX18_DEBUG_HI_FILE("Encoder poll\n");
539         poll_wait(filp, &s->waitq, wait);
540
541         if (atomic_read(&s->q_full.buffers))
542                 return POLLIN | POLLRDNORM;
543         if (eof)
544                 return POLLHUP;
545         return 0;
546 }
547
548 void cx18_stop_capture(struct cx18_open_id *id, int gop_end)
549 {
550         struct cx18 *cx = id->cx;
551         struct cx18_stream *s = &cx->streams[id->type];
552
553         CX18_DEBUG_IOCTL("close() of %s\n", s->name);
554
555         /* 'Unclaim' this stream */
556
557         /* Stop capturing */
558         if (test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
559                 struct cx18_stream *s_vbi =
560                         &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
561
562                 CX18_DEBUG_INFO("close stopping capture\n");
563                 /* Special case: a running VBI capture for VBI insertion
564                    in the mpeg stream. Need to stop that too. */
565                 if (id->type == CX18_ENC_STREAM_TYPE_MPG &&
566                     test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags) &&
567                     !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
568                         CX18_DEBUG_INFO("close stopping embedded VBI capture\n");
569                         cx18_stop_v4l2_encode_stream(s_vbi, 0);
570                 }
571                 if (id->type == CX18_ENC_STREAM_TYPE_VBI &&
572                     test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags))
573                         /* Also used internally, don't stop capturing */
574                         s->id = -1;
575                 else
576                         cx18_stop_v4l2_encode_stream(s, gop_end);
577         }
578         if (!gop_end) {
579                 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
580                 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
581                 cx18_release_stream(s);
582         }
583 }
584
585 int cx18_v4l2_close(struct file *filp)
586 {
587         struct cx18_open_id *id = filp->private_data;
588         struct cx18 *cx = id->cx;
589         struct cx18_stream *s = &cx->streams[id->type];
590
591         CX18_DEBUG_IOCTL("close() of %s\n", s->name);
592
593         v4l2_prio_close(&cx->prio, &id->prio);
594
595         /* Easy case first: this stream was never claimed by us */
596         if (s->id != id->open_id) {
597                 kfree(id);
598                 return 0;
599         }
600
601         /* 'Unclaim' this stream */
602
603         /* Stop radio */
604         mutex_lock(&cx->serialize_lock);
605         if (id->type == CX18_ENC_STREAM_TYPE_RAD) {
606                 /* Closing radio device, return to TV mode */
607                 cx18_mute(cx);
608                 /* Mark that the radio is no longer in use */
609                 clear_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
610                 /* Switch tuner to TV */
611                 cx18_call_all(cx, core, s_std, cx->std);
612                 /* Select correct audio input (i.e. TV tuner or Line in) */
613                 cx18_audio_set_io(cx);
614                 if (atomic_read(&cx->ana_capturing) > 0) {
615                         /* Undo video mute */
616                         cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2, s->handle,
617                                 cx->params.video_mute |
618                                         (cx->params.video_mute_yuv << 8));
619                 }
620                 /* Done! Unmute and continue. */
621                 cx18_unmute(cx);
622                 cx18_release_stream(s);
623         } else {
624                 cx18_stop_capture(id, 0);
625         }
626         kfree(id);
627         mutex_unlock(&cx->serialize_lock);
628         return 0;
629 }
630
631 static int cx18_serialized_open(struct cx18_stream *s, struct file *filp)
632 {
633         struct cx18 *cx = s->cx;
634         struct cx18_open_id *item;
635
636         CX18_DEBUG_FILE("open %s\n", s->name);
637
638         /* Allocate memory */
639         item = kmalloc(sizeof(struct cx18_open_id), GFP_KERNEL);
640         if (NULL == item) {
641                 CX18_DEBUG_WARN("nomem on v4l2 open\n");
642                 return -ENOMEM;
643         }
644         item->cx = cx;
645         item->type = s->type;
646         v4l2_prio_open(&cx->prio, &item->prio);
647
648         item->open_id = cx->open_id++;
649         filp->private_data = item;
650
651         if (item->type == CX18_ENC_STREAM_TYPE_RAD) {
652                 /* Try to claim this stream */
653                 if (cx18_claim_stream(item, item->type)) {
654                         /* No, it's already in use */
655                         kfree(item);
656                         return -EBUSY;
657                 }
658
659                 if (!test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) {
660                         if (atomic_read(&cx->ana_capturing) > 0) {
661                                 /* switching to radio while capture is
662                                    in progress is not polite */
663                                 cx18_release_stream(s);
664                                 kfree(item);
665                                 return -EBUSY;
666                         }
667                 }
668
669                 /* Mark that the radio is being used. */
670                 set_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
671                 /* We have the radio */
672                 cx18_mute(cx);
673                 /* Switch tuner to radio */
674                 cx18_call_all(cx, tuner, s_radio);
675                 /* Select the correct audio input (i.e. radio tuner) */
676                 cx18_audio_set_io(cx);
677                 /* Done! Unmute and continue. */
678                 cx18_unmute(cx);
679         }
680         return 0;
681 }
682
683 int cx18_v4l2_open(struct file *filp)
684 {
685         int res;
686         struct video_device *video_dev = video_devdata(filp);
687         struct cx18_stream *s = video_get_drvdata(video_dev);
688         struct cx18 *cx = s->cx;;
689
690         mutex_lock(&cx->serialize_lock);
691         if (cx18_init_on_first_open(cx)) {
692                 CX18_ERR("Failed to initialize on minor %d\n",
693                          video_dev->minor);
694                 mutex_unlock(&cx->serialize_lock);
695                 return -ENXIO;
696         }
697         res = cx18_serialized_open(s, filp);
698         mutex_unlock(&cx->serialize_lock);
699         return res;
700 }
701
702 void cx18_mute(struct cx18 *cx)
703 {
704         u32 h;
705         if (atomic_read(&cx->ana_capturing)) {
706                 h = cx18_find_handle(cx);
707                 if (h != CX18_INVALID_TASK_HANDLE)
708                         cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 1);
709                 else
710                         CX18_ERR("Can't find valid task handle for mute\n");
711         }
712         CX18_DEBUG_INFO("Mute\n");
713 }
714
715 void cx18_unmute(struct cx18 *cx)
716 {
717         u32 h;
718         if (atomic_read(&cx->ana_capturing)) {
719                 h = cx18_find_handle(cx);
720                 if (h != CX18_INVALID_TASK_HANDLE) {
721                         cx18_msleep_timeout(100, 0);
722                         cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2, h, 12);
723                         cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 0);
724                 } else
725                         CX18_ERR("Can't find valid task handle for unmute\n");
726         }
727         CX18_DEBUG_INFO("Unmute\n");
728 }