1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 file operation functions
4 Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
5 Copyright (C) 2004 Chris Kennedy <c@groovy.org>
6 Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
7
8 */
9
10 #include "ivtv-driver.h"
11 #include "ivtv-fileops.h"
12 #include "ivtv-i2c.h"
13 #include "ivtv-queue.h"
14 #include "ivtv-udma.h"
15 #include "ivtv-irq.h"
16 #include "ivtv-vbi.h"
17 #include "ivtv-mailbox.h"
18 #include "ivtv-routing.h"
19 #include "ivtv-streams.h"
20 #include "ivtv-yuv.h"
21 #include "ivtv-ioctl.h"
22 #include "ivtv-cards.h"
23 #include "ivtv-firmware.h"
24 #include <linux/lockdep.h>
25 #include <media/v4l2-event.h>
26 #include <media/i2c/saa7115.h>
27
28 /* This function tries to claim the stream for a specific file descriptor.
29 If no one else is using this stream then the stream is claimed and
30 associated VBI streams are also automatically claimed.
31 Possible error returns: -EBUSY if someone else has claimed
32 the stream or 0 on success. */
ivtv_claim_stream(struct ivtv_open_id * id,int type)33 int ivtv_claim_stream(struct ivtv_open_id *id, int type)
34 {
35 struct ivtv *itv = id->itv;
36 struct ivtv_stream *s = &itv->streams[type];
37 struct ivtv_stream *s_vbi;
38 int vbi_type;
39
40 if (test_and_set_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
41 /* someone already claimed this stream */
42 if (s->fh == &id->fh) {
43 /* yes, this file descriptor did. So that's OK. */
44 return 0;
45 }
46 if (s->fh == NULL && (type == IVTV_DEC_STREAM_TYPE_VBI ||
47 type == IVTV_ENC_STREAM_TYPE_VBI)) {
48 /* VBI is handled already internally, now also assign
49 the file descriptor to this stream for external
50 reading of the stream. */
51 s->fh = &id->fh;
52 IVTV_DEBUG_INFO("Start Read VBI\n");
53 return 0;
54 }
55 /* someone else is using this stream already */
56 IVTV_DEBUG_INFO("Stream %d is busy\n", type);
57 return -EBUSY;
58 }
59 s->fh = &id->fh;
60 if (type == IVTV_DEC_STREAM_TYPE_VBI) {
61 /* Enable reinsertion interrupt */
62 ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
63 }
64
65 /* IVTV_DEC_STREAM_TYPE_MPG needs to claim IVTV_DEC_STREAM_TYPE_VBI,
66 IVTV_ENC_STREAM_TYPE_MPG needs to claim IVTV_ENC_STREAM_TYPE_VBI
67 (provided VBI insertion is on and sliced VBI is selected), for all
68 other streams we're done */
69 if (type == IVTV_DEC_STREAM_TYPE_MPG) {
70 vbi_type = IVTV_DEC_STREAM_TYPE_VBI;
71 } else if (type == IVTV_ENC_STREAM_TYPE_MPG &&
72 itv->vbi.insert_mpeg && !ivtv_raw_vbi(itv)) {
73 vbi_type = IVTV_ENC_STREAM_TYPE_VBI;
74 } else {
75 return 0;
76 }
77 s_vbi = &itv->streams[vbi_type];
78
79 if (!test_and_set_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags)) {
80 /* Enable reinsertion interrupt */
81 if (vbi_type == IVTV_DEC_STREAM_TYPE_VBI)
82 ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
83 }
84 /* mark that it is used internally */
85 set_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags);
86 return 0;
87 }
88 EXPORT_SYMBOL(ivtv_claim_stream);
89
90 /* This function releases a previously claimed stream. It will take into
91 account associated VBI streams. */
ivtv_release_stream(struct ivtv_stream * s)92 void ivtv_release_stream(struct ivtv_stream *s)
93 {
94 struct ivtv *itv = s->itv;
95 struct ivtv_stream *s_vbi;
96
97 s->fh = NULL;
98 if ((s->type == IVTV_DEC_STREAM_TYPE_VBI || s->type == IVTV_ENC_STREAM_TYPE_VBI) &&
99 test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
100 /* this stream is still in use internally */
101 return;
102 }
103 if (!test_and_clear_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
104 IVTV_DEBUG_WARN("Release stream %s not in use!\n", s->name);
105 return;
106 }
107
108 ivtv_flush_queues(s);
109
110 /* disable reinsertion interrupt */
111 if (s->type == IVTV_DEC_STREAM_TYPE_VBI)
112 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
113
114 /* IVTV_DEC_STREAM_TYPE_MPG needs to release IVTV_DEC_STREAM_TYPE_VBI,
115 IVTV_ENC_STREAM_TYPE_MPG needs to release IVTV_ENC_STREAM_TYPE_VBI,
116 for all other streams we're done */
117 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
118 s_vbi = &itv->streams[IVTV_DEC_STREAM_TYPE_VBI];
119 else if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
120 s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
121 else
122 return;
123
124 /* clear internal use flag */
125 if (!test_and_clear_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
126 /* was already cleared */
127 return;
128 }
129 if (s_vbi->fh) {
130 /* VBI stream still claimed by a file descriptor */
131 return;
132 }
133 /* disable reinsertion interrupt */
134 if (s_vbi->type == IVTV_DEC_STREAM_TYPE_VBI)
135 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
136 clear_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags);
137 ivtv_flush_queues(s_vbi);
138 }
139 EXPORT_SYMBOL(ivtv_release_stream);
140
ivtv_dualwatch(struct ivtv * itv)141 static void ivtv_dualwatch(struct ivtv *itv)
142 {
143 struct v4l2_tuner vt;
144 u32 new_stereo_mode;
145 const u32 dual = 0x02;
146
147 new_stereo_mode = v4l2_ctrl_g_ctrl(itv->cxhdl.audio_mode);
148 memset(&vt, 0, sizeof(vt));
149 ivtv_call_all(itv, tuner, g_tuner, &vt);
150 if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 && (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
151 new_stereo_mode = dual;
152
153 if (new_stereo_mode == itv->dualwatch_stereo_mode)
154 return;
155
156 IVTV_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x.\n",
157 itv->dualwatch_stereo_mode, new_stereo_mode);
158 if (v4l2_ctrl_s_ctrl(itv->cxhdl.audio_mode, new_stereo_mode))
159 IVTV_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
160 }
161
ivtv_update_pgm_info(struct ivtv * itv)162 static void ivtv_update_pgm_info(struct ivtv *itv)
163 {
164 u32 wr_idx = (read_enc(itv->pgm_info_offset) - itv->pgm_info_offset - 4) / 24;
165 int cnt;
166 int i = 0;
167
168 if (wr_idx >= itv->pgm_info_num) {
169 IVTV_DEBUG_WARN("Invalid PGM index %d (>= %d)\n", wr_idx, itv->pgm_info_num);
170 return;
171 }
172 cnt = (wr_idx + itv->pgm_info_num - itv->pgm_info_write_idx) % itv->pgm_info_num;
173 while (i < cnt) {
174 int idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
175 struct v4l2_enc_idx_entry *e = itv->pgm_info + idx;
176 u32 addr = itv->pgm_info_offset + 4 + idx * 24;
177 const int mapping[8] = { -1, V4L2_ENC_IDX_FRAME_I, V4L2_ENC_IDX_FRAME_P, -1,
178 V4L2_ENC_IDX_FRAME_B, -1, -1, -1 };
179 // 1=I, 2=P, 4=B
180
181 e->offset = read_enc(addr + 4) + ((u64)read_enc(addr + 8) << 32);
182 if (e->offset > itv->mpg_data_received) {
183 break;
184 }
185 e->offset += itv->vbi_data_inserted;
186 e->length = read_enc(addr);
187 e->pts = read_enc(addr + 16) + ((u64)(read_enc(addr + 20) & 1) << 32);
188 e->flags = mapping[read_enc(addr + 12) & 7];
189 i++;
190 }
191 itv->pgm_info_write_idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
192 }
193
ivtv_schedule(struct ivtv_stream * s)194 static void ivtv_schedule(struct ivtv_stream *s)
195 {
196 struct ivtv *itv = s->itv;
197 DEFINE_WAIT(wait);
198
199 lockdep_assert_held(&itv->serialize_lock);
200
201 mutex_unlock(&itv->serialize_lock);
202 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
203 /* New buffers might have become free before we were added to the waitqueue */
204 if (!s->q_free.buffers)
205 schedule();
206 finish_wait(&s->waitq, &wait);
207 mutex_lock(&itv->serialize_lock);
208 }
209
ivtv_get_buffer(struct ivtv_stream * s,int non_block,int * err)210 static struct ivtv_buffer *ivtv_get_buffer(struct ivtv_stream *s, int non_block, int *err)
211 {
212 struct ivtv *itv = s->itv;
213 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
214 struct ivtv_buffer *buf;
215
216 *err = 0;
217 while (1) {
218 if (s->type == IVTV_ENC_STREAM_TYPE_MPG) {
219 /* Process pending program info updates and pending VBI data */
220 ivtv_update_pgm_info(itv);
221
222 if (time_after(jiffies,
223 itv->dualwatch_jiffies +
224 msecs_to_jiffies(1000))) {
225 itv->dualwatch_jiffies = jiffies;
226 ivtv_dualwatch(itv);
227 }
228
229 if (test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
230 !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
231 while ((buf = ivtv_dequeue(s_vbi, &s_vbi->q_full))) {
232 /* byteswap and process VBI data */
233 ivtv_process_vbi_data(itv, buf, s_vbi->dma_pts, s_vbi->type);
234 ivtv_enqueue(s_vbi, buf, &s_vbi->q_free);
235 }
236 }
237 buf = &itv->vbi.sliced_mpeg_buf;
238 if (buf->readpos != buf->bytesused) {
239 return buf;
240 }
241 }
242
243 /* do we have leftover data? */
244 buf = ivtv_dequeue(s, &s->q_io);
245 if (buf)
246 return buf;
247
248 /* do we have new data? */
249 buf = ivtv_dequeue(s, &s->q_full);
250 if (buf) {
251 if ((buf->b_flags & IVTV_F_B_NEED_BUF_SWAP) == 0)
252 return buf;
253 buf->b_flags &= ~IVTV_F_B_NEED_BUF_SWAP;
254 if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
255 /* byteswap MPG data */
256 ivtv_buf_swap(buf);
257 else if (s->type != IVTV_DEC_STREAM_TYPE_VBI) {
258 /* byteswap and process VBI data */
259 ivtv_process_vbi_data(itv, buf, s->dma_pts, s->type);
260 }
261 return buf;
262 }
263
264 /* return if end of stream */
265 if (s->type != IVTV_DEC_STREAM_TYPE_VBI && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
266 IVTV_DEBUG_INFO("EOS %s\n", s->name);
267 return NULL;
268 }
269
270 /* return if file was opened with O_NONBLOCK */
271 if (non_block) {
272 *err = -EAGAIN;
273 return NULL;
274 }
275
276 /* wait for more data to arrive */
277 ivtv_schedule(s);
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
ivtv_setup_sliced_vbi_buf(struct ivtv * itv)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
ivtv_copy_buf_to_user(struct ivtv_stream * s,struct ivtv_buffer * buf,char __user * ubuf,size_t ucount)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
ivtv_read(struct ivtv_stream * s,char __user * ubuf,size_t tot_count,int non_block)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
ivtv_read_pos(struct ivtv_stream * s,char __user * ubuf,size_t count,loff_t * pos,int non_block)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
ivtv_start_capture(struct ivtv_open_id * id)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 -EINVAL;
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
ivtv_v4l2_read(struct file * filp,char __user * buf,size_t count,loff_t * pos)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 ssize_t rc;
509
510 IVTV_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
511
512 if (mutex_lock_interruptible(&itv->serialize_lock))
513 return -ERESTARTSYS;
514 rc = ivtv_start_capture(id);
515 if (!rc)
516 rc = ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
517 mutex_unlock(&itv->serialize_lock);
518 return rc;
519 }
520
ivtv_start_decoding(struct ivtv_open_id * id,int speed)521 int ivtv_start_decoding(struct ivtv_open_id *id, int speed)
522 {
523 struct ivtv *itv = id->itv;
524 struct ivtv_stream *s = &itv->streams[id->type];
525 int rc;
526
527 if (atomic_read(&itv->decoding) == 0) {
528 if (ivtv_claim_stream(id, s->type)) {
529 /* someone else is using this stream already */
530 IVTV_DEBUG_WARN("start decode, stream already claimed\n");
531 return -EBUSY;
532 }
533 rc = ivtv_start_v4l2_decode_stream(s, 0);
534 if (rc < 0) {
535 if (rc == -EAGAIN)
536 rc = ivtv_start_v4l2_decode_stream(s, 0);
537 if (rc < 0)
538 return rc;
539 }
540 }
541 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
542 return ivtv_set_speed(itv, speed);
543 return 0;
544 }
545
ivtv_schedule_dma(struct ivtv_stream * s)546 static int ivtv_schedule_dma(struct ivtv_stream *s)
547 {
548 struct ivtv *itv = s->itv;
549 int got_sig;
550 DEFINE_WAIT(wait);
551
552 lockdep_assert_held(&itv->serialize_lock);
553
554 mutex_unlock(&itv->serialize_lock);
555 prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
556 while (!(got_sig = signal_pending(current)) &&
557 test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags))
558 schedule();
559 finish_wait(&itv->dma_waitq, &wait);
560 mutex_lock(&itv->serialize_lock);
561
562 return got_sig;
563 }
564
ivtv_write(struct file * filp,const char __user * user_buf,size_t count,loff_t * pos)565 static ssize_t ivtv_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
566 {
567 struct ivtv_open_id *id = fh2id(filp->private_data);
568 struct ivtv *itv = id->itv;
569 struct ivtv_stream *s = &itv->streams[id->type];
570 struct yuv_playback_info *yi = &itv->yuv_info;
571 struct ivtv_buffer *buf;
572 struct ivtv_queue q;
573 int bytes_written = 0;
574 int mode;
575 int rc;
576
577 IVTV_DEBUG_HI_FILE("write %zd bytes to %s\n", count, s->name);
578
579 if (s->type != IVTV_DEC_STREAM_TYPE_MPG &&
580 s->type != IVTV_DEC_STREAM_TYPE_YUV &&
581 s->type != IVTV_DEC_STREAM_TYPE_VOUT)
582 /* not decoder streams */
583 return -EINVAL;
584
585 /* Try to claim this stream */
586 if (ivtv_claim_stream(id, s->type))
587 return -EBUSY;
588
589 /* This stream does not need to start any decoding */
590 if (s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
591 int elems = count / sizeof(struct v4l2_sliced_vbi_data);
592
593 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
594 return ivtv_write_vbi_from_user(itv,
595 (const struct v4l2_sliced_vbi_data __user *)user_buf, elems);
596 }
597
598 mode = s->type == IVTV_DEC_STREAM_TYPE_MPG ? OUT_MPG : OUT_YUV;
599
600 if (ivtv_set_output_mode(itv, mode) != mode) {
601 ivtv_release_stream(s);
602 return -EBUSY;
603 }
604 ivtv_queue_init(&q);
605 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
606
607 /* Start decoder (returns 0 if already started) */
608 rc = ivtv_start_decoding(id, itv->speed);
609 if (rc) {
610 IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);
611
612 /* failure, clean up */
613 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
614 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
615 return rc;
616 }
617
618 retry:
619 /* If possible, just DMA the entire frame - Check the data transfer size
620 since we may get here before the stream has been fully set-up */
621 if (mode == OUT_YUV && s->q_full.length == 0 && itv->dma_data_req_size) {
622 while (count >= itv->dma_data_req_size) {
623 rc = ivtv_yuv_udma_stream_frame(itv, (void __user *)user_buf);
624
625 if (rc < 0)
626 return rc;
627
628 bytes_written += itv->dma_data_req_size;
629 user_buf += itv->dma_data_req_size;
630 count -= itv->dma_data_req_size;
631 }
632 if (count == 0) {
633 IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
634 return bytes_written;
635 }
636 }
637
638 for (;;) {
639 /* Gather buffers */
640 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
641 ivtv_enqueue(s, buf, &q);
642 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) {
643 ivtv_enqueue(s, buf, &q);
644 }
645 if (q.buffers)
646 break;
647 if (filp->f_flags & O_NONBLOCK)
648 return -EAGAIN;
649 ivtv_schedule(s);
650 if (signal_pending(current)) {
651 IVTV_DEBUG_INFO("User stopped %s\n", s->name);
652 return -EINTR;
653 }
654 }
655
656 /* copy user data into buffers */
657 while ((buf = ivtv_dequeue(s, &q))) {
658 /* yuv is a pain. Don't copy more data than needed for a single
659 frame, otherwise we lose sync with the incoming stream */
660 if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
661 yi->stream_size + count > itv->dma_data_req_size)
662 rc = ivtv_buf_copy_from_user(s, buf, user_buf,
663 itv->dma_data_req_size - yi->stream_size);
664 else
665 rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
666
667 /* Make sure we really got all the user data */
668 if (rc < 0) {
669 ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
670 return rc;
671 }
672 user_buf += rc;
673 count -= rc;
674 bytes_written += rc;
675
676 if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
677 yi->stream_size += rc;
678 /* If we have a complete yuv frame, break loop now */
679 if (yi->stream_size == itv->dma_data_req_size) {
680 ivtv_enqueue(s, buf, &s->q_full);
681 yi->stream_size = 0;
682 break;
683 }
684 }
685
686 if (buf->bytesused != s->buf_size) {
687 /* incomplete, leave in q_io for next time */
688 ivtv_enqueue(s, buf, &s->q_io);
689 break;
690 }
691 /* Byteswap MPEG buffer */
692 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
693 ivtv_buf_swap(buf);
694 ivtv_enqueue(s, buf, &s->q_full);
695 }
696
697 if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) {
698 if (s->q_full.length >= itv->dma_data_req_size) {
699 if (mode == OUT_YUV)
700 ivtv_yuv_setup_stream_frame(itv);
701
702 if (ivtv_schedule_dma(s)) {
703 IVTV_DEBUG_INFO("User interrupted %s\n", s->name);
704 return -EINTR;
705 }
706
707 clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
708 ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
709 ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1);
710 }
711 }
712 /* more user data is available, wait until buffers become free
713 to transfer the rest. */
714 if (count && !(filp->f_flags & O_NONBLOCK))
715 goto retry;
716 IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
717 return bytes_written;
718 }
719
ivtv_v4l2_write(struct file * filp,const char __user * user_buf,size_t count,loff_t * pos)720 ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
721 {
722 struct ivtv_open_id *id = fh2id(filp->private_data);
723 struct ivtv *itv = id->itv;
724 ssize_t res;
725
726 if (mutex_lock_interruptible(&itv->serialize_lock))
727 return -ERESTARTSYS;
728 res = ivtv_write(filp, user_buf, count, pos);
729 mutex_unlock(&itv->serialize_lock);
730 return res;
731 }
732
ivtv_v4l2_dec_poll(struct file * filp,poll_table * wait)733 __poll_t ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait)
734 {
735 struct ivtv_open_id *id = fh2id(filp->private_data);
736 struct ivtv *itv = id->itv;
737 struct ivtv_stream *s = &itv->streams[id->type];
738 __poll_t res = 0;
739
740 /* add stream's waitq to the poll list */
741 IVTV_DEBUG_HI_FILE("Decoder poll\n");
742
743 /* If there are subscribed events, then only use the new event
744 API instead of the old video.h based API. */
745 if (!list_empty(&id->fh.subscribed)) {
746 poll_wait(filp, &id->fh.wait, wait);
747 /* Turn off the old-style vsync events */
748 clear_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
749 if (v4l2_event_pending(&id->fh))
750 res = EPOLLPRI;
751 } else {
752 /* This is the old-style API which is here only for backwards
753 compatibility. */
754 poll_wait(filp, &s->waitq, wait);
755 set_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
756 if (test_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags) ||
757 test_bit(IVTV_F_I_EV_DEC_STOPPED, &itv->i_flags))
758 res = EPOLLPRI;
759 }
760
761 /* Allow write if buffers are available for writing */
762 if (s->q_free.buffers)
763 res |= EPOLLOUT | EPOLLWRNORM;
764 return res;
765 }
766
ivtv_v4l2_enc_poll(struct file * filp,poll_table * wait)767 __poll_t ivtv_v4l2_enc_poll(struct file *filp, poll_table *wait)
768 {
769 __poll_t req_events = poll_requested_events(wait);
770 struct ivtv_open_id *id = fh2id(filp->private_data);
771 struct ivtv *itv = id->itv;
772 struct ivtv_stream *s = &itv->streams[id->type];
773 int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
774 __poll_t res = 0;
775
776 /* Start a capture if there is none */
777 if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags) &&
778 s->type != IVTV_ENC_STREAM_TYPE_RAD &&
779 (req_events & (EPOLLIN | EPOLLRDNORM))) {
780 int rc;
781
782 mutex_lock(&itv->serialize_lock);
783 rc = ivtv_start_capture(id);
784 mutex_unlock(&itv->serialize_lock);
785 if (rc) {
786 IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
787 s->name, rc);
788 return EPOLLERR;
789 }
790 IVTV_DEBUG_FILE("Encoder poll started capture\n");
791 }
792
793 /* add stream's waitq to the poll list */
794 IVTV_DEBUG_HI_FILE("Encoder poll\n");
795 poll_wait(filp, &s->waitq, wait);
796 if (v4l2_event_pending(&id->fh))
797 res |= EPOLLPRI;
798 else
799 poll_wait(filp, &id->fh.wait, wait);
800
801 if (s->q_full.length || s->q_io.length)
802 return res | EPOLLIN | EPOLLRDNORM;
803 if (eof)
804 return res | EPOLLHUP;
805 return res;
806 }
807
ivtv_stop_capture(struct ivtv_open_id * id,int gop_end)808 void ivtv_stop_capture(struct ivtv_open_id *id, int gop_end)
809 {
810 struct ivtv *itv = id->itv;
811 struct ivtv_stream *s = &itv->streams[id->type];
812
813 IVTV_DEBUG_FILE("close() of %s\n", s->name);
814
815 /* 'Unclaim' this stream */
816
817 /* Stop capturing */
818 if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
819 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
820
821 IVTV_DEBUG_INFO("close stopping capture\n");
822 /* Special case: a running VBI capture for VBI insertion
823 in the mpeg stream. Need to stop that too. */
824 if (id->type == IVTV_ENC_STREAM_TYPE_MPG &&
825 test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags) &&
826 !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
827 IVTV_DEBUG_INFO("close stopping embedded VBI capture\n");
828 ivtv_stop_v4l2_encode_stream(s_vbi, 0);
829 }
830 if ((id->type == IVTV_DEC_STREAM_TYPE_VBI ||
831 id->type == IVTV_ENC_STREAM_TYPE_VBI) &&
832 test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
833 /* Also used internally, don't stop capturing */
834 s->fh = NULL;
835 }
836 else {
837 ivtv_stop_v4l2_encode_stream(s, gop_end);
838 }
839 }
840 if (!gop_end) {
841 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
842 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
843 ivtv_release_stream(s);
844 }
845 }
846
ivtv_stop_decoding(struct ivtv_open_id * id,int flags,u64 pts)847 static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
848 {
849 struct ivtv *itv = id->itv;
850 struct ivtv_stream *s = &itv->streams[id->type];
851
852 IVTV_DEBUG_FILE("close() of %s\n", s->name);
853
854 if (id->type == IVTV_DEC_STREAM_TYPE_YUV &&
855 test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) {
856 /* Restore registers we've changed & clean up any mess */
857 ivtv_yuv_close(itv);
858 }
859
860 /* Stop decoding */
861 if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
862 IVTV_DEBUG_INFO("close stopping decode\n");
863
864 ivtv_stop_v4l2_decode_stream(s, flags, pts);
865 itv->output_mode = OUT_NONE;
866 }
867 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
868 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
869
870 if (itv->output_mode == OUT_UDMA_YUV && id->yuv_frames)
871 itv->output_mode = OUT_NONE;
872
873 itv->speed = 0;
874 clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags);
875 ivtv_release_stream(s);
876 }
877
ivtv_v4l2_close(struct file * filp)878 int ivtv_v4l2_close(struct file *filp)
879 {
880 struct v4l2_fh *fh = filp->private_data;
881 struct ivtv_open_id *id = fh2id(fh);
882 struct ivtv *itv = id->itv;
883 struct ivtv_stream *s = &itv->streams[id->type];
884
885 IVTV_DEBUG_FILE("close %s\n", s->name);
886
887 mutex_lock(&itv->serialize_lock);
888
889 /* Stop radio */
890 if (id->type == IVTV_ENC_STREAM_TYPE_RAD &&
891 v4l2_fh_is_singular_file(filp)) {
892 /* Closing radio device, return to TV mode */
893 ivtv_mute(itv);
894 /* Mark that the radio is no longer in use */
895 clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
896 /* Switch tuner to TV */
897 ivtv_call_all(itv, video, s_std, itv->std);
898 /* Select correct audio input (i.e. TV tuner or Line in) */
899 ivtv_audio_set_io(itv);
900 if (itv->hw_flags & IVTV_HW_SAA711X) {
901 ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
902 SAA7115_FREQ_32_11_MHZ, 0);
903 }
904 if (atomic_read(&itv->capturing) > 0) {
905 /* Undo video mute */
906 ivtv_vapi(itv, CX2341X_ENC_MUTE_VIDEO, 1,
907 v4l2_ctrl_g_ctrl(itv->cxhdl.video_mute) |
908 (v4l2_ctrl_g_ctrl(itv->cxhdl.video_mute_yuv) << 8));
909 }
910 /* Done! Unmute and continue. */
911 ivtv_unmute(itv);
912 }
913
914 v4l2_fh_del(fh);
915 v4l2_fh_exit(fh);
916
917 /* Easy case first: this stream was never claimed by us */
918 if (s->fh != &id->fh)
919 goto close_done;
920
921 /* 'Unclaim' this stream */
922
923 if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
924 struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT];
925
926 ivtv_stop_decoding(id, V4L2_DEC_CMD_STOP_TO_BLACK | V4L2_DEC_CMD_STOP_IMMEDIATELY, 0);
927
928 /* If all output streams are closed, and if the user doesn't have
929 IVTV_DEC_STREAM_TYPE_VOUT open, then disable CC on TV-out. */
930 if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) {
931 /* disable CC on TV-out */
932 ivtv_disable_cc(itv);
933 }
934 } else {
935 ivtv_stop_capture(id, 0);
936 }
937 close_done:
938 kfree(id);
939 mutex_unlock(&itv->serialize_lock);
940 return 0;
941 }
942
ivtv_open(struct file * filp)943 static int ivtv_open(struct file *filp)
944 {
945 struct video_device *vdev = video_devdata(filp);
946 struct ivtv_stream *s = video_get_drvdata(vdev);
947 struct ivtv *itv = s->itv;
948 struct ivtv_open_id *item;
949 int res = 0;
950
951 IVTV_DEBUG_FILE("open %s\n", s->name);
952
953 if (ivtv_init_on_first_open(itv)) {
954 IVTV_ERR("Failed to initialize on device %s\n",
955 video_device_node_name(vdev));
956 return -ENXIO;
957 }
958
959 #ifdef CONFIG_VIDEO_ADV_DEBUG
960 /* Unless ivtv_fw_debug is set, error out if firmware dead. */
961 if (ivtv_fw_debug) {
962 IVTV_WARN("Opening %s with dead firmware lockout disabled\n",
963 video_device_node_name(vdev));
964 IVTV_WARN("Selected firmware errors will be ignored\n");
965 } else {
966 #else
967 if (1) {
968 #endif
969 res = ivtv_firmware_check(itv, "ivtv_serialized_open");
970 if (res == -EAGAIN)
971 res = ivtv_firmware_check(itv, "ivtv_serialized_open");
972 if (res < 0)
973 return -EIO;
974 }
975
976 if (s->type == IVTV_DEC_STREAM_TYPE_MPG &&
977 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags))
978 return -EBUSY;
979
980 if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
981 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags))
982 return -EBUSY;
983
984 if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
985 if (read_reg(0x82c) == 0) {
986 IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n");
987 /* return -ENODEV; */
988 }
989 ivtv_udma_alloc(itv);
990 }
991
992 /* Allocate memory */
993 item = kzalloc(sizeof(struct ivtv_open_id), GFP_KERNEL);
994 if (NULL == item) {
995 IVTV_DEBUG_WARN("nomem on v4l2 open\n");
996 return -ENOMEM;
997 }
998 v4l2_fh_init(&item->fh, &s->vdev);
999 item->itv = itv;
1000 item->type = s->type;
1001
1002 filp->private_data = &item->fh;
1003 v4l2_fh_add(&item->fh);
1004
1005 if (item->type == IVTV_ENC_STREAM_TYPE_RAD &&
1006 v4l2_fh_is_singular_file(filp)) {
1007 if (!test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) {
1008 if (atomic_read(&itv->capturing) > 0) {
1009 /* switching to radio while capture is
1010 in progress is not polite */
1011 v4l2_fh_del(&item->fh);
1012 v4l2_fh_exit(&item->fh);
1013 kfree(item);
1014 return -EBUSY;
1015 }
1016 }
1017 /* Mark that the radio is being used. */
1018 set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
1019 /* We have the radio */
1020 ivtv_mute(itv);
1021 /* Switch tuner to radio */
1022 ivtv_call_all(itv, tuner, s_radio);
1023 /* Select the correct audio input (i.e. radio tuner) */
1024 ivtv_audio_set_io(itv);
1025 if (itv->hw_flags & IVTV_HW_SAA711X) {
1026 ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
1027 SAA7115_FREQ_32_11_MHZ, SAA7115_FREQ_FL_APLL);
1028 }
1029 /* Done! Unmute and continue. */
1030 ivtv_unmute(itv);
1031 }
1032
1033 /* YUV or MPG Decoding Mode? */
1034 if (s->type == IVTV_DEC_STREAM_TYPE_MPG) {
1035 clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
1036 } else if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
1037 set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
1038 /* For yuv, we need to know the dma size before we start */
1039 itv->dma_data_req_size =
1040 1080 * ((itv->yuv_info.v4l2_src_h + 31) & ~31);
1041 itv->yuv_info.stream_size = 0;
1042 }
1043 return 0;
1044 }
1045
1046 int ivtv_v4l2_open(struct file *filp)
1047 {
1048 struct video_device *vdev = video_devdata(filp);
1049 int res;
1050
1051 if (mutex_lock_interruptible(vdev->lock))
1052 return -ERESTARTSYS;
1053 res = ivtv_open(filp);
1054 mutex_unlock(vdev->lock);
1055 return res;
1056 }
1057
1058 void ivtv_mute(struct ivtv *itv)
1059 {
1060 if (atomic_read(&itv->capturing))
1061 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 1);
1062 IVTV_DEBUG_INFO("Mute\n");
1063 }
1064
1065 void ivtv_unmute(struct ivtv *itv)
1066 {
1067 if (atomic_read(&itv->capturing)) {
1068 ivtv_msleep_timeout(100, 0);
1069 ivtv_vapi(itv, CX2341X_ENC_MISC, 1, 12);
1070 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 0);
1071 }
1072 IVTV_DEBUG_INFO("Unmute\n");
1073 }
1074