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Merge remote-tracking branch 'moduleh/module.h-split'
[linux-2.6/next.git] / drivers / media / video / ivtv / ivtv-fileops.c
blob38f052257f4620498d6b23e0bf3b7cfb88aa5ba9
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->id == id->open_id) {
54 /* yes, this file descriptor did. So that's OK. */
55 return 0;
56 }
57 if (s->id == -1 && (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->id = id->open_id;
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->id = id->open_id;
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->id = -1;
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->id != -1) {
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 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
272 /* New buffers might have become available before we were added to the waitqueue */
273 if (!s->q_full.buffers)
274 schedule();
275 finish_wait(&s->waitq, &wait);
276 if (signal_pending(current)) {
277 /* return if a signal was received */
278 IVTV_DEBUG_INFO("User stopped %s\n", s->name);
279 *err = -EINTR;
280 return NULL;
281 }
282 }
283 }
284
285 static void ivtv_setup_sliced_vbi_buf(struct ivtv *itv)
286 {
287 int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
288
289 itv->vbi.sliced_mpeg_buf.buf = itv->vbi.sliced_mpeg_data[idx];
290 itv->vbi.sliced_mpeg_buf.bytesused = itv->vbi.sliced_mpeg_size[idx];
291 itv->vbi.sliced_mpeg_buf.readpos = 0;
292 }
293
294 static size_t ivtv_copy_buf_to_user(struct ivtv_stream *s, struct ivtv_buffer *buf,
295 char __user *ubuf, size_t ucount)
296 {
297 struct ivtv *itv = s->itv;
298 size_t len = buf->bytesused - buf->readpos;
299
300 if (len > ucount) len = ucount;
301 if (itv->vbi.insert_mpeg && s->type == IVTV_ENC_STREAM_TYPE_MPG &&
302 !ivtv_raw_vbi(itv) && buf != &itv->vbi.sliced_mpeg_buf) {
303 const char *start = buf->buf + buf->readpos;
304 const char *p = start + 1;
305 const u8 *q;
306 u8 ch = itv->search_pack_header ? 0xba : 0xe0;
307 int stuffing, i;
308
309 while (start + len > p && (q = memchr(p, 0, start + len - p))) {
310 p = q + 1;
311 if ((char *)q + 15 >= buf->buf + buf->bytesused ||
312 q[1] != 0 || q[2] != 1 || q[3] != ch) {
313 continue;
314 }
315 if (!itv->search_pack_header) {
316 if ((q[6] & 0xc0) != 0x80)
317 continue;
318 if (((q[7] & 0xc0) == 0x80 && (q[9] & 0xf0) == 0x20) ||
319 ((q[7] & 0xc0) == 0xc0 && (q[9] & 0xf0) == 0x30)) {
320 ch = 0xba;
321 itv->search_pack_header = 1;
322 p = q + 9;
323 }
324 continue;
325 }
326 stuffing = q[13] & 7;
327 /* all stuffing bytes must be 0xff */
328 for (i = 0; i < stuffing; i++)
329 if (q[14 + i] != 0xff)
330 break;
331 if (i == stuffing && (q[4] & 0xc4) == 0x44 && (q[12] & 3) == 3 &&
332 q[14 + stuffing] == 0 && q[15 + stuffing] == 0 &&
333 q[16 + stuffing] == 1) {
334 itv->search_pack_header = 0;
335 len = (char *)q - start;
336 ivtv_setup_sliced_vbi_buf(itv);
337 break;
338 }
339 }
340 }
341 if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
342 IVTV_DEBUG_WARN("copy %zd bytes to user failed for %s\n", len, s->name);
343 return -EFAULT;
344 }
345 /*IVTV_INFO("copied %lld %d %d %d %d %d vbi %d\n", itv->mpg_data_received, len, ucount,
346 buf->readpos, buf->bytesused, buf->bytesused - buf->readpos - len,
347 buf == &itv->vbi.sliced_mpeg_buf); */
348 buf->readpos += len;
349 if (s->type == IVTV_ENC_STREAM_TYPE_MPG && buf != &itv->vbi.sliced_mpeg_buf)
350 itv->mpg_data_received += len;
351 return len;
352 }
353
354 static ssize_t ivtv_read(struct ivtv_stream *s, char __user *ubuf, size_t tot_count, int non_block)
355 {
356 struct ivtv *itv = s->itv;
357 size_t tot_written = 0;
358 int single_frame = 0;
359
360 if (atomic_read(&itv->capturing) == 0 && s->id == -1) {
361 /* shouldn't happen */
362 IVTV_DEBUG_WARN("Stream %s not initialized before read\n", s->name);
363 return -EIO;
364 }
365
366 /* Each VBI buffer is one frame, the v4l2 API says that for VBI the frames should
367 arrive one-by-one, so make sure we never output more than one VBI frame at a time */
368 if (s->type == IVTV_DEC_STREAM_TYPE_VBI ||
369 (s->type == IVTV_ENC_STREAM_TYPE_VBI && !ivtv_raw_vbi(itv)))
370 single_frame = 1;
371
372 for (;;) {
373 struct ivtv_buffer *buf;
374 int rc;
375
376 buf = ivtv_get_buffer(s, non_block, &rc);
377 /* if there is no data available... */
378 if (buf == NULL) {
379 /* if we got data, then return that regardless */
380 if (tot_written)
381 break;
382 /* EOS condition */
383 if (rc == 0) {
384 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
385 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
386 ivtv_release_stream(s);
387 }
388 /* set errno */
389 return rc;
390 }
391 rc = ivtv_copy_buf_to_user(s, buf, ubuf + tot_written, tot_count - tot_written);
392 if (buf != &itv->vbi.sliced_mpeg_buf) {
393 ivtv_enqueue(s, buf, (buf->readpos == buf->bytesused) ? &s->q_free : &s->q_io);
394 }
395 else if (buf->readpos == buf->bytesused) {
396 int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
397 itv->vbi.sliced_mpeg_size[idx] = 0;
398 itv->vbi.inserted_frame++;
399 itv->vbi_data_inserted += buf->bytesused;
400 }
401 if (rc < 0)
402 return rc;
403 tot_written += rc;
404
405 if (tot_written == tot_count || single_frame)
406 break;
407 }
408 return tot_written;
409 }
410
411 static ssize_t ivtv_read_pos(struct ivtv_stream *s, char __user *ubuf, size_t count,
412 loff_t *pos, int non_block)
413 {
414 ssize_t rc = count ? ivtv_read(s, ubuf, count, non_block) : 0;
415 struct ivtv *itv = s->itv;
416
417 IVTV_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
418 if (rc > 0)
419 pos += rc;
420 return rc;
421 }
422
423 int ivtv_start_capture(struct ivtv_open_id *id)
424 {
425 struct ivtv *itv = id->itv;
426 struct ivtv_stream *s = &itv->streams[id->type];
427 struct ivtv_stream *s_vbi;
428
429 if (s->type == IVTV_ENC_STREAM_TYPE_RAD ||
430 s->type == IVTV_DEC_STREAM_TYPE_MPG ||
431 s->type == IVTV_DEC_STREAM_TYPE_YUV ||
432 s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
433 /* you cannot read from these stream types. */
434 return -EPERM;
435 }
436
437 /* Try to claim this stream. */
438 if (ivtv_claim_stream(id, s->type))
439 return -EBUSY;
440
441 /* This stream does not need to start capturing */
442 if (s->type == IVTV_DEC_STREAM_TYPE_VBI) {
443 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
444 return 0;
445 }
446
447 /* If capture is already in progress, then we also have to
448 do nothing extra. */
449 if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) || test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
450 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
451 return 0;
452 }
453
454 /* Start VBI capture if required */
455 s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
456 if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
457 test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
458 !test_and_set_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
459 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is claimed
460 automatically when the MPG stream is claimed.
461 We only need to start the VBI capturing. */
462 if (ivtv_start_v4l2_encode_stream(s_vbi)) {
463 IVTV_DEBUG_WARN("VBI capture start failed\n");
464
465 /* Failure, clean up and return an error */
466 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
467 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
468 /* also releases the associated VBI stream */
469 ivtv_release_stream(s);
470 return -EIO;
471 }
472 IVTV_DEBUG_INFO("VBI insertion started\n");
473 }
474
475 /* Tell the card to start capturing */
476 if (!ivtv_start_v4l2_encode_stream(s)) {
477 /* We're done */
478 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
479 /* Resume a possibly paused encoder */
480 if (test_and_clear_bit(IVTV_F_I_ENC_PAUSED, &itv->i_flags))
481 ivtv_vapi(itv, CX2341X_ENC_PAUSE_ENCODER, 1, 1);
482 return 0;
483 }
484
485 /* failure, clean up */
486 IVTV_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
487
488 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is released
489 automatically when the MPG stream is released.
490 We only need to stop the VBI capturing. */
491 if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
492 test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
493 ivtv_stop_v4l2_encode_stream(s_vbi, 0);
494 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
495 }
496 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
497 ivtv_release_stream(s);
498 return -EIO;
499 }
500
501 ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos)
502 {
503 struct ivtv_open_id *id = fh2id(filp->private_data);
504 struct ivtv *itv = id->itv;
505 struct ivtv_stream *s = &itv->streams[id->type];
506 int rc;
507
508 IVTV_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
509
510 mutex_lock(&itv->serialize_lock);
511 rc = ivtv_start_capture(id);
512 mutex_unlock(&itv->serialize_lock);
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 mutex_lock(&itv->serialize_lock);
588 rc = ivtv_start_decoding(id, itv->speed);
589 mutex_unlock(&itv->serialize_lock);
590 if (rc) {
591 IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);
592
593 /* failure, clean up */
594 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
595 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
596 return rc;
597 }
598
599 retry:
600 /* If possible, just DMA the entire frame - Check the data transfer size
601 since we may get here before the stream has been fully set-up */
602 if (mode == OUT_YUV && s->q_full.length == 0 && itv->dma_data_req_size) {
603 while (count >= itv->dma_data_req_size) {
604 rc = ivtv_yuv_udma_stream_frame(itv, (void __user *)user_buf);
605
606 if (rc < 0)
607 return rc;
608
609 bytes_written += itv->dma_data_req_size;
610 user_buf += itv->dma_data_req_size;
611 count -= itv->dma_data_req_size;
612 }
613 if (count == 0) {
614 IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
615 return bytes_written;
616 }
617 }
618
619 for (;;) {
620 /* Gather buffers */
621 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
622 ivtv_enqueue(s, buf, &q);
623 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) {
624 ivtv_enqueue(s, buf, &q);
625 }
626 if (q.buffers)
627 break;
628 if (filp->f_flags & O_NONBLOCK)
629 return -EAGAIN;
630 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
631 /* New buffers might have become free before we were added to the waitqueue */
632 if (!s->q_free.buffers)
633 schedule();
634 finish_wait(&s->waitq, &wait);
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 prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
690 while (!(got_sig = signal_pending(current)) &&
691 test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) {
692 schedule();
693 }
694 finish_wait(&itv->dma_waitq, &wait);
695 if (got_sig) {
696 IVTV_DEBUG_INFO("User interrupted %s\n", s->name);
697 return -EINTR;
698 }
699
700 clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
701 ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
702 ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1);
703 }
704 }
705 /* more user data is available, wait until buffers become free
706 to transfer the rest. */
707 if (count && !(filp->f_flags & O_NONBLOCK))
708 goto retry;
709 IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
710 return bytes_written;
711 }
712
713 unsigned int ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait)
714 {
715 struct ivtv_open_id *id = fh2id(filp->private_data);
716 struct ivtv *itv = id->itv;
717 struct ivtv_stream *s = &itv->streams[id->type];
718 int res = 0;
719
720 /* add stream's waitq to the poll list */
721 IVTV_DEBUG_HI_FILE("Decoder poll\n");
722
723 /* If there are subscribed events, then only use the new event
724 API instead of the old video.h based API. */
725 if (!list_empty(&id->fh.subscribed)) {
726 poll_wait(filp, &id->fh.wait, wait);
727 /* Turn off the old-style vsync events */
728 clear_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
729 if (v4l2_event_pending(&id->fh))
730 res = POLLPRI;
731 } else {
732 /* This is the old-style API which is here only for backwards
733 compatibility. */
734 poll_wait(filp, &s->waitq, wait);
735 set_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
736 if (test_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags) ||
737 test_bit(IVTV_F_I_EV_DEC_STOPPED, &itv->i_flags))
738 res = POLLPRI;
739 }
740
741 /* Allow write if buffers are available for writing */
742 if (s->q_free.buffers)
743 res |= POLLOUT | POLLWRNORM;
744 return res;
745 }
746
747 unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait)
748 {
749 struct ivtv_open_id *id = fh2id(filp->private_data);
750 struct ivtv *itv = id->itv;
751 struct ivtv_stream *s = &itv->streams[id->type];
752 int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
753 unsigned res = 0;
754
755 /* Start a capture if there is none */
756 if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
757 int rc;
758
759 mutex_lock(&itv->serialize_lock);
760 rc = ivtv_start_capture(id);
761 mutex_unlock(&itv->serialize_lock);
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->id = -1;
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 v4l2_fh_del(fh);
865 v4l2_fh_exit(fh);
866
867 /* Easy case first: this stream was never claimed by us */
868 if (s->id != id->open_id) {
869 kfree(id);
870 return 0;
871 }
872
873 /* 'Unclaim' this stream */
874
875 /* Stop radio */
876 mutex_lock(&itv->serialize_lock);
877 if (id->type == IVTV_ENC_STREAM_TYPE_RAD) {
878 /* Closing radio device, return to TV mode */
879 ivtv_mute(itv);
880 /* Mark that the radio is no longer in use */
881 clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
882 /* Switch tuner to TV */
883 ivtv_call_all(itv, core, s_std, itv->std);
884 /* Select correct audio input (i.e. TV tuner or Line in) */
885 ivtv_audio_set_io(itv);
886 if (itv->hw_flags & IVTV_HW_SAA711X) {
887 ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
888 SAA7115_FREQ_32_11_MHZ, 0);
889 }
890 if (atomic_read(&itv->capturing) > 0) {
891 /* Undo video mute */
892 ivtv_vapi(itv, CX2341X_ENC_MUTE_VIDEO, 1,
893 v4l2_ctrl_g_ctrl(itv->cxhdl.video_mute) |
894 (v4l2_ctrl_g_ctrl(itv->cxhdl.video_mute_yuv) << 8));
895 }
896 /* Done! Unmute and continue. */
897 ivtv_unmute(itv);
898 ivtv_release_stream(s);
899 } else if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
900 struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT];
901
902 ivtv_stop_decoding(id, VIDEO_CMD_STOP_TO_BLACK | VIDEO_CMD_STOP_IMMEDIATELY, 0);
903
904 /* If all output streams are closed, and if the user doesn't have
905 IVTV_DEC_STREAM_TYPE_VOUT open, then disable CC on TV-out. */
906 if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) {
907 /* disable CC on TV-out */
908 ivtv_disable_cc(itv);
909 }
910 } else {
911 ivtv_stop_capture(id, 0);
912 }
913 kfree(id);
914 mutex_unlock(&itv->serialize_lock);
915 return 0;
916 }
917
918 static int ivtv_serialized_open(struct ivtv_stream *s, struct file *filp)
919 {
920 #ifdef CONFIG_VIDEO_ADV_DEBUG
921 struct video_device *vdev = video_devdata(filp);
922 #endif
923 struct ivtv *itv = s->itv;
924 struct ivtv_open_id *item;
925 int res = 0;
926
927 IVTV_DEBUG_FILE("open %s\n", s->name);
928
929 #ifdef CONFIG_VIDEO_ADV_DEBUG
930 /* Unless ivtv_fw_debug is set, error out if firmware dead. */
931 if (ivtv_fw_debug) {
932 IVTV_WARN("Opening %s with dead firmware lockout disabled\n",
933 video_device_node_name(vdev));
934 IVTV_WARN("Selected firmware errors will be ignored\n");
935 } else {
936 #else
937 if (1) {
938 #endif
939 res = ivtv_firmware_check(itv, "ivtv_serialized_open");
940 if (res == -EAGAIN)
941 res = ivtv_firmware_check(itv, "ivtv_serialized_open");
942 if (res < 0)
943 return -EIO;
944 }
945
946 if (s->type == IVTV_DEC_STREAM_TYPE_MPG &&
947 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags))
948 return -EBUSY;
949
950 if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
951 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags))
952 return -EBUSY;
953
954 if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
955 if (read_reg(0x82c) == 0) {
956 IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n");
957 /* return -ENODEV; */
958 }
959 ivtv_udma_alloc(itv);
960 }
961
962 /* Allocate memory */
963 item = kzalloc(sizeof(struct ivtv_open_id), GFP_KERNEL);
964 if (NULL == item) {
965 IVTV_DEBUG_WARN("nomem on v4l2 open\n");
966 return -ENOMEM;
967 }
968 v4l2_fh_init(&item->fh, s->vdev);
969 if (res < 0) {
970 v4l2_fh_exit(&item->fh);
971 kfree(item);
972 return res;
973 }
974 item->itv = itv;
975 item->type = s->type;
976
977 item->open_id = itv->open_id++;
978 filp->private_data = &item->fh;
979
980 if (item->type == IVTV_ENC_STREAM_TYPE_RAD) {
981 /* Try to claim this stream */
982 if (ivtv_claim_stream(item, item->type)) {
983 /* No, it's already in use */
984 v4l2_fh_exit(&item->fh);
985 kfree(item);
986 return -EBUSY;
987 }
988
989 if (!test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) {
990 if (atomic_read(&itv->capturing) > 0) {
991 /* switching to radio while capture is
992 in progress is not polite */
993 ivtv_release_stream(s);
994 v4l2_fh_exit(&item->fh);
995 kfree(item);
996 return -EBUSY;
997 }
998 }
999 /* Mark that the radio is being used. */
1000 set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
1001 /* We have the radio */
1002 ivtv_mute(itv);
1003 /* Switch tuner to radio */
1004 ivtv_call_all(itv, tuner, s_radio);
1005 /* Select the correct audio input (i.e. radio tuner) */
1006 ivtv_audio_set_io(itv);
1007 if (itv->hw_flags & IVTV_HW_SAA711X) {
1008 ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
1009 SAA7115_FREQ_32_11_MHZ, SAA7115_FREQ_FL_APLL);
1010 }
1011 /* Done! Unmute and continue. */
1012 ivtv_unmute(itv);
1013 }
1014
1015 /* YUV or MPG Decoding Mode? */
1016 if (s->type == IVTV_DEC_STREAM_TYPE_MPG) {
1017 clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
1018 } else if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
1019 set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
1020 /* For yuv, we need to know the dma size before we start */
1021 itv->dma_data_req_size =
1022 1080 * ((itv->yuv_info.v4l2_src_h + 31) & ~31);
1023 itv->yuv_info.stream_size = 0;
1024 }
1025 v4l2_fh_add(&item->fh);
1026 return 0;
1027 }
1028
1029 int ivtv_v4l2_open(struct file *filp)
1030 {
1031 int res;
1032 struct ivtv *itv = NULL;
1033 struct ivtv_stream *s = NULL;
1034 struct video_device *vdev = video_devdata(filp);
1035
1036 s = video_get_drvdata(vdev);
1037 itv = s->itv;
1038
1039 mutex_lock(&itv->serialize_lock);
1040 if (ivtv_init_on_first_open(itv)) {
1041 IVTV_ERR("Failed to initialize on device %s\n",
1042 video_device_node_name(vdev));
1043 mutex_unlock(&itv->serialize_lock);
1044 return -ENXIO;
1045 }
1046 res = ivtv_serialized_open(s, filp);
1047 mutex_unlock(&itv->serialize_lock);
1048 return res;
1049 }
1050
1051 void ivtv_mute(struct ivtv *itv)
1052 {
1053 if (atomic_read(&itv->capturing))
1054 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 1);
1055 IVTV_DEBUG_INFO("Mute\n");
1056 }
1057
1058 void ivtv_unmute(struct ivtv *itv)
1059 {
1060 if (atomic_read(&itv->capturing)) {
1061 ivtv_msleep_timeout(100, 0);
1062 ivtv_vapi(itv, CX2341X_ENC_MISC, 1, 12);
1063 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 0);
1064 }
1065 IVTV_DEBUG_INFO("Unmute\n");
1066 }
linux-next