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Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / drivers / media / video / ivtv / ivtv-fileops.c
blob2cd6c89b7d917d618de7791bf919bb1015c899b9
1 /*
2 file operation functions
3 Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
4 Copyright (C) 2004 Chris Kennedy <c@groovy.org>
5 Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22 #include "ivtv-driver.h"
23 #include "ivtv-fileops.h"
24 #include "ivtv-i2c.h"
25 #include "ivtv-queue.h"
26 #include "ivtv-udma.h"
27 #include "ivtv-irq.h"
28 #include "ivtv-vbi.h"
29 #include "ivtv-mailbox.h"
30 #include "ivtv-routing.h"
31 #include "ivtv-streams.h"
32 #include "ivtv-yuv.h"
33 #include "ivtv-ioctl.h"
34 #include "ivtv-cards.h"
35 #include "ivtv-firmware.h"
36 #include <media/v4l2-event.h>
37 #include <media/saa7115.h>
38
39 /* This function tries to claim the stream for a specific file descriptor.
40 If no one else is using this stream then the stream is claimed and
41 associated VBI streams are also automatically claimed.
42 Possible error returns: -EBUSY if someone else has claimed
43 the stream or 0 on success. */
44 static int ivtv_claim_stream(struct ivtv_open_id *id, int type)
45 {
46 struct ivtv *itv = id->itv;
47 struct ivtv_stream *s = &itv->streams[type];
48 struct ivtv_stream *s_vbi;
49 int vbi_type;
50
51 if (test_and_set_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
52 /* someone already claimed this stream */
53 if (s->fh == &id->fh) {
54 /* yes, this file descriptor did. So that's OK. */
55 return 0;
56 }
57 if (s->fh == NULL && (type == IVTV_DEC_STREAM_TYPE_VBI ||
58 type == IVTV_ENC_STREAM_TYPE_VBI)) {
59 /* VBI is handled already internally, now also assign
60 the file descriptor to this stream for external
61 reading of the stream. */
62 s->fh = &id->fh;
63 IVTV_DEBUG_INFO("Start Read VBI\n");
64 return 0;
65 }
66 /* someone else is using this stream already */
67 IVTV_DEBUG_INFO("Stream %d is busy\n", type);
68 return -EBUSY;
69 }
70 s->fh = &id->fh;
71 if (type == IVTV_DEC_STREAM_TYPE_VBI) {
72 /* Enable reinsertion interrupt */
73 ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
74 }
75
76 /* IVTV_DEC_STREAM_TYPE_MPG needs to claim IVTV_DEC_STREAM_TYPE_VBI,
77 IVTV_ENC_STREAM_TYPE_MPG needs to claim IVTV_ENC_STREAM_TYPE_VBI
78 (provided VBI insertion is on and sliced VBI is selected), for all
79 other streams we're done */
80 if (type == IVTV_DEC_STREAM_TYPE_MPG) {
81 vbi_type = IVTV_DEC_STREAM_TYPE_VBI;
82 } else if (type == IVTV_ENC_STREAM_TYPE_MPG &&
83 itv->vbi.insert_mpeg && !ivtv_raw_vbi(itv)) {
84 vbi_type = IVTV_ENC_STREAM_TYPE_VBI;
85 } else {
86 return 0;
87 }
88 s_vbi = &itv->streams[vbi_type];
89
90 if (!test_and_set_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags)) {
91 /* Enable reinsertion interrupt */
92 if (vbi_type == IVTV_DEC_STREAM_TYPE_VBI)
93 ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
94 }
95 /* mark that it is used internally */
96 set_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags);
97 return 0;
98 }
99
100 /* This function releases a previously claimed stream. It will take into
101 account associated VBI streams. */
102 void ivtv_release_stream(struct ivtv_stream *s)
103 {
104 struct ivtv *itv = s->itv;
105 struct ivtv_stream *s_vbi;
106
107 s->fh = NULL;
108 if ((s->type == IVTV_DEC_STREAM_TYPE_VBI || s->type == IVTV_ENC_STREAM_TYPE_VBI) &&
109 test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
110 /* this stream is still in use internally */
111 return;
112 }
113 if (!test_and_clear_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
114 IVTV_DEBUG_WARN("Release stream %s not in use!\n", s->name);
115 return;
116 }
117
118 ivtv_flush_queues(s);
119
120 /* disable reinsertion interrupt */
121 if (s->type == IVTV_DEC_STREAM_TYPE_VBI)
122 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
123
124 /* IVTV_DEC_STREAM_TYPE_MPG needs to release IVTV_DEC_STREAM_TYPE_VBI,
125 IVTV_ENC_STREAM_TYPE_MPG needs to release IVTV_ENC_STREAM_TYPE_VBI,
126 for all other streams we're done */
127 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
128 s_vbi = &itv->streams[IVTV_DEC_STREAM_TYPE_VBI];
129 else if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
130 s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
131 else
132 return;
133
134 /* clear internal use flag */
135 if (!test_and_clear_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
136 /* was already cleared */
137 return;
138 }
139 if (s_vbi->fh) {
140 /* VBI stream still claimed by a file descriptor */
141 return;
142 }
143 /* disable reinsertion interrupt */
144 if (s_vbi->type == IVTV_DEC_STREAM_TYPE_VBI)
145 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
146 clear_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags);
147 ivtv_flush_queues(s_vbi);
148 }
149
150 static void ivtv_dualwatch(struct ivtv *itv)
151 {
152 struct v4l2_tuner vt;
153 u32 new_stereo_mode;
154 const u32 dual = 0x02;
155
156 new_stereo_mode = v4l2_ctrl_g_ctrl(itv->cxhdl.audio_mode);
157 memset(&vt, 0, sizeof(vt));
158 ivtv_call_all(itv, tuner, g_tuner, &vt);
159 if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 && (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
160 new_stereo_mode = dual;
161
162 if (new_stereo_mode == itv->dualwatch_stereo_mode)
163 return;
164
165 IVTV_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x.\n",
166 itv->dualwatch_stereo_mode, new_stereo_mode);
167 if (v4l2_ctrl_s_ctrl(itv->cxhdl.audio_mode, new_stereo_mode))
168 IVTV_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
169 }
170
171 static void ivtv_update_pgm_info(struct ivtv *itv)
172 {
173 u32 wr_idx = (read_enc(itv->pgm_info_offset) - itv->pgm_info_offset - 4) / 24;
174 int cnt;
175 int i = 0;
176
177 if (wr_idx >= itv->pgm_info_num) {
178 IVTV_DEBUG_WARN("Invalid PGM index %d (>= %d)\n", wr_idx, itv->pgm_info_num);
179 return;
180 }
181 cnt = (wr_idx + itv->pgm_info_num - itv->pgm_info_write_idx) % itv->pgm_info_num;
182 while (i < cnt) {
183 int idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
184 struct v4l2_enc_idx_entry *e = itv->pgm_info + idx;
185 u32 addr = itv->pgm_info_offset + 4 + idx * 24;
186 const int mapping[8] = { -1, V4L2_ENC_IDX_FRAME_I, V4L2_ENC_IDX_FRAME_P, -1,
187 V4L2_ENC_IDX_FRAME_B, -1, -1, -1 };
188 // 1=I, 2=P, 4=B
189
190 e->offset = read_enc(addr + 4) + ((u64)read_enc(addr + 8) << 32);
191 if (e->offset > itv->mpg_data_received) {
192 break;
193 }
194 e->offset += itv->vbi_data_inserted;
195 e->length = read_enc(addr);
196 e->pts = read_enc(addr + 16) + ((u64)(read_enc(addr + 20) & 1) << 32);
197 e->flags = mapping[read_enc(addr + 12) & 7];
198 i++;
199 }
200 itv->pgm_info_write_idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
201 }
202
203 static struct ivtv_buffer *ivtv_get_buffer(struct ivtv_stream *s, int non_block, int *err)
204 {
205 struct ivtv *itv = s->itv;
206 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
207 struct ivtv_buffer *buf;
208 DEFINE_WAIT(wait);
209
210 *err = 0;
211 while (1) {
212 if (s->type == IVTV_ENC_STREAM_TYPE_MPG) {
213 /* Process pending program info updates and pending VBI data */
214 ivtv_update_pgm_info(itv);
215
216 if (time_after(jiffies,
217 itv->dualwatch_jiffies +
218 msecs_to_jiffies(1000))) {
219 itv->dualwatch_jiffies = jiffies;
220 ivtv_dualwatch(itv);
221 }
222
223 if (test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
224 !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
225 while ((buf = ivtv_dequeue(s_vbi, &s_vbi->q_full))) {
226 /* byteswap and process VBI data */
227 ivtv_process_vbi_data(itv, buf, s_vbi->dma_pts, s_vbi->type);
228 ivtv_enqueue(s_vbi, buf, &s_vbi->q_free);
229 }
230 }
231 buf = &itv->vbi.sliced_mpeg_buf;
232 if (buf->readpos != buf->bytesused) {
233 return buf;
234 }
235 }
236
237 /* do we have leftover data? */
238 buf = ivtv_dequeue(s, &s->q_io);
239 if (buf)
240 return buf;
241
242 /* do we have new data? */
243 buf = ivtv_dequeue(s, &s->q_full);
244 if (buf) {
245 if ((buf->b_flags & IVTV_F_B_NEED_BUF_SWAP) == 0)
246 return buf;
247 buf->b_flags &= ~IVTV_F_B_NEED_BUF_SWAP;
248 if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
249 /* byteswap MPG data */
250 ivtv_buf_swap(buf);
251 else if (s->type != IVTV_DEC_STREAM_TYPE_VBI) {
252 /* byteswap and process VBI data */
253 ivtv_process_vbi_data(itv, buf, s->dma_pts, s->type);
254 }
255 return buf;
256 }
257
258 /* return if end of stream */
259 if (s->type != IVTV_DEC_STREAM_TYPE_VBI && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
260 IVTV_DEBUG_INFO("EOS %s\n", s->name);
261 return NULL;
262 }
263
264 /* return if file was opened with O_NONBLOCK */
265 if (non_block) {
266 *err = -EAGAIN;
267 return NULL;
268 }
269
270 /* wait for more data to arrive */
271 mutex_unlock(&itv->serialize_lock);
272 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
273 /* New buffers might have become available before we were added to the waitqueue */
274 if (!s->q_full.buffers)
275 schedule();
276 finish_wait(&s->waitq, &wait);
277 mutex_lock(&itv->serialize_lock);
278 if (signal_pending(current)) {
279 /* return if a signal was received */
280 IVTV_DEBUG_INFO("User stopped %s\n", s->name);
281 *err = -EINTR;
282 return NULL;
283 }
284 }
285 }
286
287 static void ivtv_setup_sliced_vbi_buf(struct ivtv *itv)
288 {
289 int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
290
291 itv->vbi.sliced_mpeg_buf.buf = itv->vbi.sliced_mpeg_data[idx];
292 itv->vbi.sliced_mpeg_buf.bytesused = itv->vbi.sliced_mpeg_size[idx];
293 itv->vbi.sliced_mpeg_buf.readpos = 0;
294 }
295
296 static size_t ivtv_copy_buf_to_user(struct ivtv_stream *s, struct ivtv_buffer *buf,
297 char __user *ubuf, size_t ucount)
298 {
299 struct ivtv *itv = s->itv;
300 size_t len = buf->bytesused - buf->readpos;
301
302 if (len > ucount) len = ucount;
303 if (itv->vbi.insert_mpeg && s->type == IVTV_ENC_STREAM_TYPE_MPG &&
304 !ivtv_raw_vbi(itv) && buf != &itv->vbi.sliced_mpeg_buf) {
305 const char *start = buf->buf + buf->readpos;
306 const char *p = start + 1;
307 const u8 *q;
308 u8 ch = itv->search_pack_header ? 0xba : 0xe0;
309 int stuffing, i;
310
311 while (start + len > p && (q = memchr(p, 0, start + len - p))) {
312 p = q + 1;
313 if ((char *)q + 15 >= buf->buf + buf->bytesused ||
314 q[1] != 0 || q[2] != 1 || q[3] != ch) {
315 continue;
316 }
317 if (!itv->search_pack_header) {
318 if ((q[6] & 0xc0) != 0x80)
319 continue;
320 if (((q[7] & 0xc0) == 0x80 && (q[9] & 0xf0) == 0x20) ||
321 ((q[7] & 0xc0) == 0xc0 && (q[9] & 0xf0) == 0x30)) {
322 ch = 0xba;
323 itv->search_pack_header = 1;
324 p = q + 9;
325 }
326 continue;
327 }
328 stuffing = q[13] & 7;
329 /* all stuffing bytes must be 0xff */
330 for (i = 0; i < stuffing; i++)
331 if (q[14 + i] != 0xff)
332 break;
333 if (i == stuffing && (q[4] & 0xc4) == 0x44 && (q[12] & 3) == 3 &&
334 q[14 + stuffing] == 0 && q[15 + stuffing] == 0 &&
335 q[16 + stuffing] == 1) {
336 itv->search_pack_header = 0;
337 len = (char *)q - start;
338 ivtv_setup_sliced_vbi_buf(itv);
339 break;
340 }
341 }
342 }
343 if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
344 IVTV_DEBUG_WARN("copy %zd bytes to user failed for %s\n", len, s->name);
345 return -EFAULT;
346 }
347 /*IVTV_INFO("copied %lld %d %d %d %d %d vbi %d\n", itv->mpg_data_received, len, ucount,
348 buf->readpos, buf->bytesused, buf->bytesused - buf->readpos - len,
349 buf == &itv->vbi.sliced_mpeg_buf); */
350 buf->readpos += len;
351 if (s->type == IVTV_ENC_STREAM_TYPE_MPG && buf != &itv->vbi.sliced_mpeg_buf)
352 itv->mpg_data_received += len;
353 return len;
354 }
355
356 static ssize_t ivtv_read(struct ivtv_stream *s, char __user *ubuf, size_t tot_count, int non_block)
357 {
358 struct ivtv *itv = s->itv;
359 size_t tot_written = 0;
360 int single_frame = 0;
361
362 if (atomic_read(&itv->capturing) == 0 && s->fh == NULL) {
363 /* shouldn't happen */
364 IVTV_DEBUG_WARN("Stream %s not initialized before read\n", s->name);
365 return -EIO;
366 }
367
368 /* Each VBI buffer is one frame, the v4l2 API says that for VBI the frames should
369 arrive one-by-one, so make sure we never output more than one VBI frame at a time */
370 if (s->type == IVTV_DEC_STREAM_TYPE_VBI ||
371 (s->type == IVTV_ENC_STREAM_TYPE_VBI && !ivtv_raw_vbi(itv)))
372 single_frame = 1;
373
374 for (;;) {
375 struct ivtv_buffer *buf;
376 int rc;
377
378 buf = ivtv_get_buffer(s, non_block, &rc);
379 /* if there is no data available... */
380 if (buf == NULL) {
381 /* if we got data, then return that regardless */
382 if (tot_written)
383 break;
384 /* EOS condition */
385 if (rc == 0) {
386 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
387 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
388 ivtv_release_stream(s);
389 }
390 /* set errno */
391 return rc;
392 }
393 rc = ivtv_copy_buf_to_user(s, buf, ubuf + tot_written, tot_count - tot_written);
394 if (buf != &itv->vbi.sliced_mpeg_buf) {
395 ivtv_enqueue(s, buf, (buf->readpos == buf->bytesused) ? &s->q_free : &s->q_io);
396 }
397 else if (buf->readpos == buf->bytesused) {
398 int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
399 itv->vbi.sliced_mpeg_size[idx] = 0;
400 itv->vbi.inserted_frame++;
401 itv->vbi_data_inserted += buf->bytesused;
402 }
403 if (rc < 0)
404 return rc;
405 tot_written += rc;
406
407 if (tot_written == tot_count || single_frame)
408 break;
409 }
410 return tot_written;
411 }
412
413 static ssize_t ivtv_read_pos(struct ivtv_stream *s, char __user *ubuf, size_t count,
414 loff_t *pos, int non_block)
415 {
416 ssize_t rc = count ? ivtv_read(s, ubuf, count, non_block) : 0;
417 struct ivtv *itv = s->itv;
418
419 IVTV_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
420 if (rc > 0)
421 pos += rc;
422 return rc;
423 }
424
425 int ivtv_start_capture(struct ivtv_open_id *id)
426 {
427 struct ivtv *itv = id->itv;
428 struct ivtv_stream *s = &itv->streams[id->type];
429 struct ivtv_stream *s_vbi;
430
431 if (s->type == IVTV_ENC_STREAM_TYPE_RAD ||
432 s->type == IVTV_DEC_STREAM_TYPE_MPG ||
433 s->type == IVTV_DEC_STREAM_TYPE_YUV ||
434 s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
435 /* you cannot read from these stream types. */
436 return -EPERM;
437 }
438
439 /* Try to claim this stream. */
440 if (ivtv_claim_stream(id, s->type))
441 return -EBUSY;
442
443 /* This stream does not need to start capturing */
444 if (s->type == IVTV_DEC_STREAM_TYPE_VBI) {
445 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
446 return 0;
447 }
448
449 /* If capture is already in progress, then we also have to
450 do nothing extra. */
451 if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) || test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
452 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
453 return 0;
454 }
455
456 /* Start VBI capture if required */
457 s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
458 if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
459 test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
460 !test_and_set_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
461 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is claimed
462 automatically when the MPG stream is claimed.
463 We only need to start the VBI capturing. */
464 if (ivtv_start_v4l2_encode_stream(s_vbi)) {
465 IVTV_DEBUG_WARN("VBI capture start failed\n");
466
467 /* Failure, clean up and return an error */
468 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
469 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
470 /* also releases the associated VBI stream */
471 ivtv_release_stream(s);
472 return -EIO;
473 }
474 IVTV_DEBUG_INFO("VBI insertion started\n");
475 }
476
477 /* Tell the card to start capturing */
478 if (!ivtv_start_v4l2_encode_stream(s)) {
479 /* We're done */
480 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
481 /* Resume a possibly paused encoder */
482 if (test_and_clear_bit(IVTV_F_I_ENC_PAUSED, &itv->i_flags))
483 ivtv_vapi(itv, CX2341X_ENC_PAUSE_ENCODER, 1, 1);
484 return 0;
485 }
486
487 /* failure, clean up */
488 IVTV_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
489
490 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is released
491 automatically when the MPG stream is released.
492 We only need to stop the VBI capturing. */
493 if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
494 test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
495 ivtv_stop_v4l2_encode_stream(s_vbi, 0);
496 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
497 }
498 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
499 ivtv_release_stream(s);
500 return -EIO;
501 }
502
503 ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos)
504 {
505 struct ivtv_open_id *id = fh2id(filp->private_data);
506 struct ivtv *itv = id->itv;
507 struct ivtv_stream *s = &itv->streams[id->type];
508 int rc;
509
510 IVTV_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
511
512 rc = ivtv_start_capture(id);
513 if (rc)
514 return rc;
515 return ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
516 }
517
518 int ivtv_start_decoding(struct ivtv_open_id *id, int speed)
519 {
520 struct ivtv *itv = id->itv;
521 struct ivtv_stream *s = &itv->streams[id->type];
522 int rc;
523
524 if (atomic_read(&itv->decoding) == 0) {
525 if (ivtv_claim_stream(id, s->type)) {
526 /* someone else is using this stream already */
527 IVTV_DEBUG_WARN("start decode, stream already claimed\n");
528 return -EBUSY;
529 }
530 rc = ivtv_start_v4l2_decode_stream(s, 0);
531 if (rc < 0) {
532 if (rc == -EAGAIN)
533 rc = ivtv_start_v4l2_decode_stream(s, 0);
534 if (rc < 0)
535 return rc;
536 }
537 }
538 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
539 return ivtv_set_speed(itv, speed);
540 return 0;
541 }
542
543 ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
544 {
545 struct ivtv_open_id *id = fh2id(filp->private_data);
546 struct ivtv *itv = id->itv;
547 struct ivtv_stream *s = &itv->streams[id->type];
548 struct yuv_playback_info *yi = &itv->yuv_info;
549 struct ivtv_buffer *buf;
550 struct ivtv_queue q;
551 int bytes_written = 0;
552 int mode;
553 int rc;
554 DEFINE_WAIT(wait);
555
556 IVTV_DEBUG_HI_FILE("write %zd bytes to %s\n", count, s->name);
557
558 if (s->type != IVTV_DEC_STREAM_TYPE_MPG &&
559 s->type != IVTV_DEC_STREAM_TYPE_YUV &&
560 s->type != IVTV_DEC_STREAM_TYPE_VOUT)
561 /* not decoder streams */
562 return -EPERM;
563
564 /* Try to claim this stream */
565 if (ivtv_claim_stream(id, s->type))
566 return -EBUSY;
567
568 /* This stream does not need to start any decoding */
569 if (s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
570 int elems = count / sizeof(struct v4l2_sliced_vbi_data);
571
572 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
573 return ivtv_write_vbi_from_user(itv,
574 (const struct v4l2_sliced_vbi_data __user *)user_buf, elems);
575 }
576
577 mode = s->type == IVTV_DEC_STREAM_TYPE_MPG ? OUT_MPG : OUT_YUV;
578
579 if (ivtv_set_output_mode(itv, mode) != mode) {
580 ivtv_release_stream(s);
581 return -EBUSY;
582 }
583 ivtv_queue_init(&q);
584 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
585
586 /* Start decoder (returns 0 if already started) */
587 rc = ivtv_start_decoding(id, itv->speed);
588 if (rc) {
589 IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);
590
591 /* failure, clean up */
592 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
593 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
594 return rc;
595 }
596
597 retry:
598 /* If possible, just DMA the entire frame - Check the data transfer size
599 since we may get here before the stream has been fully set-up */
600 if (mode == OUT_YUV && s->q_full.length == 0 && itv->dma_data_req_size) {
601 while (count >= itv->dma_data_req_size) {
602 rc = ivtv_yuv_udma_stream_frame(itv, (void __user *)user_buf);
603
604 if (rc < 0)
605 return rc;
606
607 bytes_written += itv->dma_data_req_size;
608 user_buf += itv->dma_data_req_size;
609 count -= itv->dma_data_req_size;
610 }
611 if (count == 0) {
612 IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
613 return bytes_written;
614 }
615 }
616
617 for (;;) {
618 /* Gather buffers */
619 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
620 ivtv_enqueue(s, buf, &q);
621 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) {
622 ivtv_enqueue(s, buf, &q);
623 }
624 if (q.buffers)
625 break;
626 if (filp->f_flags & O_NONBLOCK)
627 return -EAGAIN;
628 mutex_unlock(&itv->serialize_lock);
629 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
630 /* New buffers might have become free before we were added to the waitqueue */
631 if (!s->q_free.buffers)
632 schedule();
633 finish_wait(&s->waitq, &wait);
634 mutex_lock(&itv->serialize_lock);
635 if (signal_pending(current)) {
636 IVTV_DEBUG_INFO("User stopped %s\n", s->name);
637 return -EINTR;
638 }
639 }
640
641 /* copy user data into buffers */
642 while ((buf = ivtv_dequeue(s, &q))) {
643 /* yuv is a pain. Don't copy more data than needed for a single
644 frame, otherwise we lose sync with the incoming stream */
645 if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
646 yi->stream_size + count > itv->dma_data_req_size)
647 rc = ivtv_buf_copy_from_user(s, buf, user_buf,
648 itv->dma_data_req_size - yi->stream_size);
649 else
650 rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
651
652 /* Make sure we really got all the user data */
653 if (rc < 0) {
654 ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
655 return rc;
656 }
657 user_buf += rc;
658 count -= rc;
659 bytes_written += rc;
660
661 if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
662 yi->stream_size += rc;
663 /* If we have a complete yuv frame, break loop now */
664 if (yi->stream_size == itv->dma_data_req_size) {
665 ivtv_enqueue(s, buf, &s->q_full);
666 yi->stream_size = 0;
667 break;
668 }
669 }
670
671 if (buf->bytesused != s->buf_size) {
672 /* incomplete, leave in q_io for next time */
673 ivtv_enqueue(s, buf, &s->q_io);
674 break;
675 }
676 /* Byteswap MPEG buffer */
677 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
678 ivtv_buf_swap(buf);
679 ivtv_enqueue(s, buf, &s->q_full);
680 }
681
682 if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) {
683 if (s->q_full.length >= itv->dma_data_req_size) {
684 int got_sig;
685
686 if (mode == OUT_YUV)
687 ivtv_yuv_setup_stream_frame(itv);
688
689 mutex_unlock(&itv->serialize_lock);
690 prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
691 while (!(got_sig = signal_pending(current)) &&
692 test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) {
693 schedule();
694 }
695 finish_wait(&itv->dma_waitq, &wait);
696 mutex_lock(&itv->serialize_lock);
697 if (got_sig) {
698 IVTV_DEBUG_INFO("User interrupted %s\n", s->name);
699 return -EINTR;
700 }
701
702 clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
703 ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
704 ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1);
705 }
706 }
707 /* more user data is available, wait until buffers become free
708 to transfer the rest. */
709 if (count && !(filp->f_flags & O_NONBLOCK))
710 goto retry;
711 IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
712 return bytes_written;
713 }
714
715 unsigned int ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait)
716 {
717 struct ivtv_open_id *id = fh2id(filp->private_data);
718 struct ivtv *itv = id->itv;
719 struct ivtv_stream *s = &itv->streams[id->type];
720 int res = 0;
721
722 /* add stream's waitq to the poll list */
723 IVTV_DEBUG_HI_FILE("Decoder poll\n");
724
725 /* If there are subscribed events, then only use the new event
726 API instead of the old video.h based API. */
727 if (!list_empty(&id->fh.subscribed)) {
728 poll_wait(filp, &id->fh.wait, wait);
729 /* Turn off the old-style vsync events */
730 clear_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
731 if (v4l2_event_pending(&id->fh))
732 res = POLLPRI;
733 } else {
734 /* This is the old-style API which is here only for backwards
735 compatibility. */
736 poll_wait(filp, &s->waitq, wait);
737 set_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
738 if (test_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags) ||
739 test_bit(IVTV_F_I_EV_DEC_STOPPED, &itv->i_flags))
740 res = POLLPRI;
741 }
742
743 /* Allow write if buffers are available for writing */
744 if (s->q_free.buffers)
745 res |= POLLOUT | POLLWRNORM;
746 return res;
747 }
748
749 unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait)
750 {
751 struct ivtv_open_id *id = fh2id(filp->private_data);
752 struct ivtv *itv = id->itv;
753 struct ivtv_stream *s = &itv->streams[id->type];
754 int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
755 unsigned res = 0;
756
757 /* Start a capture if there is none */
758 if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
759 int rc;
760
761 rc = ivtv_start_capture(id);
762 if (rc) {
763 IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
764 s->name, rc);
765 return POLLERR;
766 }
767 IVTV_DEBUG_FILE("Encoder poll started capture\n");
768 }
769
770 /* add stream's waitq to the poll list */
771 IVTV_DEBUG_HI_FILE("Encoder poll\n");
772 poll_wait(filp, &s->waitq, wait);
773 if (v4l2_event_pending(&id->fh))
774 res |= POLLPRI;
775 else
776 poll_wait(filp, &id->fh.wait, wait);
777
778 if (s->q_full.length || s->q_io.length)
779 return res | POLLIN | POLLRDNORM;
780 if (eof)
781 return res | POLLHUP;
782 return res;
783 }
784
785 void ivtv_stop_capture(struct ivtv_open_id *id, int gop_end)
786 {
787 struct ivtv *itv = id->itv;
788 struct ivtv_stream *s = &itv->streams[id->type];
789
790 IVTV_DEBUG_FILE("close() of %s\n", s->name);
791
792 /* 'Unclaim' this stream */
793
794 /* Stop capturing */
795 if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
796 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
797
798 IVTV_DEBUG_INFO("close stopping capture\n");
799 /* Special case: a running VBI capture for VBI insertion
800 in the mpeg stream. Need to stop that too. */
801 if (id->type == IVTV_ENC_STREAM_TYPE_MPG &&
802 test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags) &&
803 !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
804 IVTV_DEBUG_INFO("close stopping embedded VBI capture\n");
805 ivtv_stop_v4l2_encode_stream(s_vbi, 0);
806 }
807 if ((id->type == IVTV_DEC_STREAM_TYPE_VBI ||
808 id->type == IVTV_ENC_STREAM_TYPE_VBI) &&
809 test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
810 /* Also used internally, don't stop capturing */
811 s->fh = NULL;
812 }
813 else {
814 ivtv_stop_v4l2_encode_stream(s, gop_end);
815 }
816 }
817 if (!gop_end) {
818 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
819 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
820 ivtv_release_stream(s);
821 }
822 }
823
824 static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
825 {
826 struct ivtv *itv = id->itv;
827 struct ivtv_stream *s = &itv->streams[id->type];
828
829 IVTV_DEBUG_FILE("close() of %s\n", s->name);
830
831 if (id->type == IVTV_DEC_STREAM_TYPE_YUV &&
832 test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) {
833 /* Restore registers we've changed & clean up any mess */
834 ivtv_yuv_close(itv);
835 }
836
837 /* Stop decoding */
838 if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
839 IVTV_DEBUG_INFO("close stopping decode\n");
840
841 ivtv_stop_v4l2_decode_stream(s, flags, pts);
842 itv->output_mode = OUT_NONE;
843 }
844 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
845 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
846
847 if (itv->output_mode == OUT_UDMA_YUV && id->yuv_frames)
848 itv->output_mode = OUT_NONE;
849
850 itv->speed = 0;
851 clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags);
852 ivtv_release_stream(s);
853 }
854
855 int ivtv_v4l2_close(struct file *filp)
856 {
857 struct v4l2_fh *fh = filp->private_data;
858 struct ivtv_open_id *id = fh2id(fh);
859 struct ivtv *itv = id->itv;
860 struct ivtv_stream *s = &itv->streams[id->type];
861
862 IVTV_DEBUG_FILE("close %s\n", s->name);
863
864 /* Stop radio */
865 if (id->type == IVTV_ENC_STREAM_TYPE_RAD &&
866 v4l2_fh_is_singular_file(filp)) {
867 /* Closing radio device, return to TV mode */
868 ivtv_mute(itv);
869 /* Mark that the radio is no longer in use */
870 clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
871 /* Switch tuner to TV */
872 ivtv_call_all(itv, core, s_std, itv->std);
873 /* Select correct audio input (i.e. TV tuner or Line in) */
874 ivtv_audio_set_io(itv);
875 if (itv->hw_flags & IVTV_HW_SAA711X) {
876 ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
877 SAA7115_FREQ_32_11_MHZ, 0);
878 }
879 if (atomic_read(&itv->capturing) > 0) {
880 /* Undo video mute */
881 ivtv_vapi(itv, CX2341X_ENC_MUTE_VIDEO, 1,
882 v4l2_ctrl_g_ctrl(itv->cxhdl.video_mute) |
883 (v4l2_ctrl_g_ctrl(itv->cxhdl.video_mute_yuv) << 8));
884 }
885 /* Done! Unmute and continue. */
886 ivtv_unmute(itv);
887 }
888
889 v4l2_fh_del(fh);
890 v4l2_fh_exit(fh);
891
892 /* Easy case first: this stream was never claimed by us */
893 if (s->fh != &id->fh) {
894 kfree(id);
895 return 0;
896 }
897
898 /* 'Unclaim' this stream */
899
900 if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
901 struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT];
902
903 ivtv_stop_decoding(id, VIDEO_CMD_STOP_TO_BLACK | VIDEO_CMD_STOP_IMMEDIATELY, 0);
904
905 /* If all output streams are closed, and if the user doesn't have
906 IVTV_DEC_STREAM_TYPE_VOUT open, then disable CC on TV-out. */
907 if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) {
908 /* disable CC on TV-out */
909 ivtv_disable_cc(itv);
910 }
911 } else {
912 ivtv_stop_capture(id, 0);
913 }
914 kfree(id);
915 return 0;
916 }
917
918 int ivtv_v4l2_open(struct file *filp)
919 {
920 struct video_device *vdev = video_devdata(filp);
921 struct ivtv_stream *s = video_get_drvdata(vdev);
922 struct ivtv *itv = s->itv;
923 struct ivtv_open_id *item;
924 int res = 0;
925
926 IVTV_DEBUG_FILE("open %s\n", s->name);
927
928 if (ivtv_init_on_first_open(itv)) {
929 IVTV_ERR("Failed to initialize on device %s\n",
930 video_device_node_name(vdev));
931 return -ENXIO;
932 }
933
934 #ifdef CONFIG_VIDEO_ADV_DEBUG
935 /* Unless ivtv_fw_debug is set, error out if firmware dead. */
936 if (ivtv_fw_debug) {
937 IVTV_WARN("Opening %s with dead firmware lockout disabled\n",
938 video_device_node_name(vdev));
939 IVTV_WARN("Selected firmware errors will be ignored\n");
940 } else {
941 #else
942 if (1) {
943 #endif
944 res = ivtv_firmware_check(itv, "ivtv_serialized_open");
945 if (res == -EAGAIN)
946 res = ivtv_firmware_check(itv, "ivtv_serialized_open");
947 if (res < 0)
948 return -EIO;
949 }
950
951 if (s->type == IVTV_DEC_STREAM_TYPE_MPG &&
952 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags))
953 return -EBUSY;
954
955 if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
956 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags))
957 return -EBUSY;
958
959 if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
960 if (read_reg(0x82c) == 0) {
961 IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n");
962 /* return -ENODEV; */
963 }
964 ivtv_udma_alloc(itv);
965 }
966
967 /* Allocate memory */
968 item = kzalloc(sizeof(struct ivtv_open_id), GFP_KERNEL);
969 if (NULL == item) {
970 IVTV_DEBUG_WARN("nomem on v4l2 open\n");
971 return -ENOMEM;
972 }
973 v4l2_fh_init(&item->fh, s->vdev);
974 item->itv = itv;
975 item->type = s->type;
976
977 filp->private_data = &item->fh;
978 v4l2_fh_add(&item->fh);
979
980 if (item->type == IVTV_ENC_STREAM_TYPE_RAD &&
981 v4l2_fh_is_singular_file(filp)) {
982 if (!test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) {
983 if (atomic_read(&itv->capturing) > 0) {
984 /* switching to radio while capture is
985 in progress is not polite */
986 v4l2_fh_del(&item->fh);
987 v4l2_fh_exit(&item->fh);
988 kfree(item);
989 return -EBUSY;
990 }
991 }
992 /* Mark that the radio is being used. */
993 set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
994 /* We have the radio */
995 ivtv_mute(itv);
996 /* Switch tuner to radio */
997 ivtv_call_all(itv, tuner, s_radio);
998 /* Select the correct audio input (i.e. radio tuner) */
999 ivtv_audio_set_io(itv);
1000 if (itv->hw_flags & IVTV_HW_SAA711X) {
1001 ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
1002 SAA7115_FREQ_32_11_MHZ, SAA7115_FREQ_FL_APLL);
1003 }
1004 /* Done! Unmute and continue. */
1005 ivtv_unmute(itv);
1006 }
1007
1008 /* YUV or MPG Decoding Mode? */
1009 if (s->type == IVTV_DEC_STREAM_TYPE_MPG) {
1010 clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
1011 } else if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
1012 set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
1013 /* For yuv, we need to know the dma size before we start */
1014 itv->dma_data_req_size =
1015 1080 * ((itv->yuv_info.v4l2_src_h + 31) & ~31);
1016 itv->yuv_info.stream_size = 0;
1017 }
1018 return 0;
1019 }
1020
1021 void ivtv_mute(struct ivtv *itv)
1022 {
1023 if (atomic_read(&itv->capturing))
1024 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 1);
1025 IVTV_DEBUG_INFO("Mute\n");
1026 }
1027
1028 void ivtv_unmute(struct ivtv *itv)
1029 {
1030 if (atomic_read(&itv->capturing)) {
1031 ivtv_msleep_timeout(100, 0);
1032 ivtv_vapi(itv, CX2341X_ENC_MISC, 1, 12);
1033 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 0);
1034 }
1035 IVTV_DEBUG_INFO("Unmute\n");
1036 }