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[ALSA] Remove PCM sleep_min and tick
[deliverable/linux.git] / sound / core / pcm_native.c
1 /*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <sound/driver.h>
23 #include <linux/mm.h>
24 #include <linux/file.h>
25 #include <linux/slab.h>
26 #include <linux/time.h>
27 #include <linux/latency.h>
28 #include <linux/uio.h>
29 #include <sound/core.h>
30 #include <sound/control.h>
31 #include <sound/info.h>
32 #include <sound/pcm.h>
33 #include <sound/pcm_params.h>
34 #include <sound/timer.h>
35 #include <sound/minors.h>
36 #include <asm/io.h>
37
38 /*
39 * Compatibility
40 */
41
42 struct snd_pcm_hw_params_old {
43 unsigned int flags;
44 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
45 SNDRV_PCM_HW_PARAM_ACCESS + 1];
46 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
47 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
48 unsigned int rmask;
49 unsigned int cmask;
50 unsigned int info;
51 unsigned int msbits;
52 unsigned int rate_num;
53 unsigned int rate_den;
54 snd_pcm_uframes_t fifo_size;
55 unsigned char reserved[64];
56 };
57
58 #ifdef CONFIG_SND_SUPPORT_OLD_API
59 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
60 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
61
62 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
63 struct snd_pcm_hw_params_old __user * _oparams);
64 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
65 struct snd_pcm_hw_params_old __user * _oparams);
66 #endif
67 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
68
69 /*
70 *
71 */
72
73 DEFINE_RWLOCK(snd_pcm_link_rwlock);
74 EXPORT_SYMBOL(snd_pcm_link_rwlock);
75
76 static DECLARE_RWSEM(snd_pcm_link_rwsem);
77
78 static inline mm_segment_t snd_enter_user(void)
79 {
80 mm_segment_t fs = get_fs();
81 set_fs(get_ds());
82 return fs;
83 }
84
85 static inline void snd_leave_user(mm_segment_t fs)
86 {
87 set_fs(fs);
88 }
89
90
91
92 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
93 {
94 struct snd_pcm_runtime *runtime;
95 struct snd_pcm *pcm = substream->pcm;
96 struct snd_pcm_str *pstr = substream->pstr;
97
98 snd_assert(substream != NULL, return -ENXIO);
99 memset(info, 0, sizeof(*info));
100 info->card = pcm->card->number;
101 info->device = pcm->device;
102 info->stream = substream->stream;
103 info->subdevice = substream->number;
104 strlcpy(info->id, pcm->id, sizeof(info->id));
105 strlcpy(info->name, pcm->name, sizeof(info->name));
106 info->dev_class = pcm->dev_class;
107 info->dev_subclass = pcm->dev_subclass;
108 info->subdevices_count = pstr->substream_count;
109 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
110 strlcpy(info->subname, substream->name, sizeof(info->subname));
111 runtime = substream->runtime;
112 /* AB: FIXME!!! This is definitely nonsense */
113 if (runtime) {
114 info->sync = runtime->sync;
115 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
116 }
117 return 0;
118 }
119
120 int snd_pcm_info_user(struct snd_pcm_substream *substream,
121 struct snd_pcm_info __user * _info)
122 {
123 struct snd_pcm_info *info;
124 int err;
125
126 info = kmalloc(sizeof(*info), GFP_KERNEL);
127 if (! info)
128 return -ENOMEM;
129 err = snd_pcm_info(substream, info);
130 if (err >= 0) {
131 if (copy_to_user(_info, info, sizeof(*info)))
132 err = -EFAULT;
133 }
134 kfree(info);
135 return err;
136 }
137
138 #undef RULES_DEBUG
139
140 #ifdef RULES_DEBUG
141 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
142 char *snd_pcm_hw_param_names[] = {
143 HW_PARAM(ACCESS),
144 HW_PARAM(FORMAT),
145 HW_PARAM(SUBFORMAT),
146 HW_PARAM(SAMPLE_BITS),
147 HW_PARAM(FRAME_BITS),
148 HW_PARAM(CHANNELS),
149 HW_PARAM(RATE),
150 HW_PARAM(PERIOD_TIME),
151 HW_PARAM(PERIOD_SIZE),
152 HW_PARAM(PERIOD_BYTES),
153 HW_PARAM(PERIODS),
154 HW_PARAM(BUFFER_TIME),
155 HW_PARAM(BUFFER_SIZE),
156 HW_PARAM(BUFFER_BYTES),
157 HW_PARAM(TICK_TIME),
158 };
159 #endif
160
161 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
162 struct snd_pcm_hw_params *params)
163 {
164 unsigned int k;
165 struct snd_pcm_hardware *hw;
166 struct snd_interval *i = NULL;
167 struct snd_mask *m = NULL;
168 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
169 unsigned int rstamps[constrs->rules_num];
170 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
171 unsigned int stamp = 2;
172 int changed, again;
173
174 params->info = 0;
175 params->fifo_size = 0;
176 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
177 params->msbits = 0;
178 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
179 params->rate_num = 0;
180 params->rate_den = 0;
181 }
182
183 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
184 m = hw_param_mask(params, k);
185 if (snd_mask_empty(m))
186 return -EINVAL;
187 if (!(params->rmask & (1 << k)))
188 continue;
189 #ifdef RULES_DEBUG
190 printk("%s = ", snd_pcm_hw_param_names[k]);
191 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
192 #endif
193 changed = snd_mask_refine(m, constrs_mask(constrs, k));
194 #ifdef RULES_DEBUG
195 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
196 #endif
197 if (changed)
198 params->cmask |= 1 << k;
199 if (changed < 0)
200 return changed;
201 }
202
203 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
204 i = hw_param_interval(params, k);
205 if (snd_interval_empty(i))
206 return -EINVAL;
207 if (!(params->rmask & (1 << k)))
208 continue;
209 #ifdef RULES_DEBUG
210 printk("%s = ", snd_pcm_hw_param_names[k]);
211 if (i->empty)
212 printk("empty");
213 else
214 printk("%c%u %u%c",
215 i->openmin ? '(' : '[', i->min,
216 i->max, i->openmax ? ')' : ']');
217 printk(" -> ");
218 #endif
219 changed = snd_interval_refine(i, constrs_interval(constrs, k));
220 #ifdef RULES_DEBUG
221 if (i->empty)
222 printk("empty\n");
223 else
224 printk("%c%u %u%c\n",
225 i->openmin ? '(' : '[', i->min,
226 i->max, i->openmax ? ')' : ']');
227 #endif
228 if (changed)
229 params->cmask |= 1 << k;
230 if (changed < 0)
231 return changed;
232 }
233
234 for (k = 0; k < constrs->rules_num; k++)
235 rstamps[k] = 0;
236 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
237 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
238 do {
239 again = 0;
240 for (k = 0; k < constrs->rules_num; k++) {
241 struct snd_pcm_hw_rule *r = &constrs->rules[k];
242 unsigned int d;
243 int doit = 0;
244 if (r->cond && !(r->cond & params->flags))
245 continue;
246 for (d = 0; r->deps[d] >= 0; d++) {
247 if (vstamps[r->deps[d]] > rstamps[k]) {
248 doit = 1;
249 break;
250 }
251 }
252 if (!doit)
253 continue;
254 #ifdef RULES_DEBUG
255 printk("Rule %d [%p]: ", k, r->func);
256 if (r->var >= 0) {
257 printk("%s = ", snd_pcm_hw_param_names[r->var]);
258 if (hw_is_mask(r->var)) {
259 m = hw_param_mask(params, r->var);
260 printk("%x", *m->bits);
261 } else {
262 i = hw_param_interval(params, r->var);
263 if (i->empty)
264 printk("empty");
265 else
266 printk("%c%u %u%c",
267 i->openmin ? '(' : '[', i->min,
268 i->max, i->openmax ? ')' : ']');
269 }
270 }
271 #endif
272 changed = r->func(params, r);
273 #ifdef RULES_DEBUG
274 if (r->var >= 0) {
275 printk(" -> ");
276 if (hw_is_mask(r->var))
277 printk("%x", *m->bits);
278 else {
279 if (i->empty)
280 printk("empty");
281 else
282 printk("%c%u %u%c",
283 i->openmin ? '(' : '[', i->min,
284 i->max, i->openmax ? ')' : ']');
285 }
286 }
287 printk("\n");
288 #endif
289 rstamps[k] = stamp;
290 if (changed && r->var >= 0) {
291 params->cmask |= (1 << r->var);
292 vstamps[r->var] = stamp;
293 again = 1;
294 }
295 if (changed < 0)
296 return changed;
297 stamp++;
298 }
299 } while (again);
300 if (!params->msbits) {
301 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
302 if (snd_interval_single(i))
303 params->msbits = snd_interval_value(i);
304 }
305
306 if (!params->rate_den) {
307 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
308 if (snd_interval_single(i)) {
309 params->rate_num = snd_interval_value(i);
310 params->rate_den = 1;
311 }
312 }
313
314 hw = &substream->runtime->hw;
315 if (!params->info)
316 params->info = hw->info;
317 if (!params->fifo_size)
318 params->fifo_size = hw->fifo_size;
319 params->rmask = 0;
320 return 0;
321 }
322
323 EXPORT_SYMBOL(snd_pcm_hw_refine);
324
325 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
326 struct snd_pcm_hw_params __user * _params)
327 {
328 struct snd_pcm_hw_params *params;
329 int err;
330
331 params = kmalloc(sizeof(*params), GFP_KERNEL);
332 if (!params) {
333 err = -ENOMEM;
334 goto out;
335 }
336 if (copy_from_user(params, _params, sizeof(*params))) {
337 err = -EFAULT;
338 goto out;
339 }
340 err = snd_pcm_hw_refine(substream, params);
341 if (copy_to_user(_params, params, sizeof(*params))) {
342 if (!err)
343 err = -EFAULT;
344 }
345 out:
346 kfree(params);
347 return err;
348 }
349
350 static int period_to_usecs(struct snd_pcm_runtime *runtime)
351 {
352 int usecs;
353
354 if (! runtime->rate)
355 return -1; /* invalid */
356
357 /* take 75% of period time as the deadline */
358 usecs = (750000 / runtime->rate) * runtime->period_size;
359 usecs += ((750000 % runtime->rate) * runtime->period_size) /
360 runtime->rate;
361
362 return usecs;
363 }
364
365 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
366 struct snd_pcm_hw_params *params)
367 {
368 struct snd_pcm_runtime *runtime;
369 int err, usecs;
370 unsigned int bits;
371 snd_pcm_uframes_t frames;
372
373 snd_assert(substream != NULL, return -ENXIO);
374 runtime = substream->runtime;
375 snd_assert(runtime != NULL, return -ENXIO);
376 snd_pcm_stream_lock_irq(substream);
377 switch (runtime->status->state) {
378 case SNDRV_PCM_STATE_OPEN:
379 case SNDRV_PCM_STATE_SETUP:
380 case SNDRV_PCM_STATE_PREPARED:
381 break;
382 default:
383 snd_pcm_stream_unlock_irq(substream);
384 return -EBADFD;
385 }
386 snd_pcm_stream_unlock_irq(substream);
387 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
388 if (!substream->oss.oss)
389 #endif
390 if (atomic_read(&substream->mmap_count))
391 return -EBADFD;
392
393 params->rmask = ~0U;
394 err = snd_pcm_hw_refine(substream, params);
395 if (err < 0)
396 goto _error;
397
398 err = snd_pcm_hw_params_choose(substream, params);
399 if (err < 0)
400 goto _error;
401
402 if (substream->ops->hw_params != NULL) {
403 err = substream->ops->hw_params(substream, params);
404 if (err < 0)
405 goto _error;
406 }
407
408 runtime->access = params_access(params);
409 runtime->format = params_format(params);
410 runtime->subformat = params_subformat(params);
411 runtime->channels = params_channels(params);
412 runtime->rate = params_rate(params);
413 runtime->period_size = params_period_size(params);
414 runtime->periods = params_periods(params);
415 runtime->buffer_size = params_buffer_size(params);
416 runtime->info = params->info;
417 runtime->rate_num = params->rate_num;
418 runtime->rate_den = params->rate_den;
419
420 bits = snd_pcm_format_physical_width(runtime->format);
421 runtime->sample_bits = bits;
422 bits *= runtime->channels;
423 runtime->frame_bits = bits;
424 frames = 1;
425 while (bits % 8 != 0) {
426 bits *= 2;
427 frames *= 2;
428 }
429 runtime->byte_align = bits / 8;
430 runtime->min_align = frames;
431
432 /* Default sw params */
433 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
434 runtime->period_step = 1;
435 runtime->control->avail_min = runtime->period_size;
436 runtime->start_threshold = 1;
437 runtime->stop_threshold = runtime->buffer_size;
438 runtime->silence_threshold = 0;
439 runtime->silence_size = 0;
440 runtime->boundary = runtime->buffer_size;
441 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
442 runtime->boundary *= 2;
443
444 snd_pcm_timer_resolution_change(substream);
445 runtime->status->state = SNDRV_PCM_STATE_SETUP;
446
447 remove_acceptable_latency(substream->latency_id);
448 if ((usecs = period_to_usecs(runtime)) >= 0)
449 set_acceptable_latency(substream->latency_id, usecs);
450 return 0;
451 _error:
452 /* hardware might be unuseable from this time,
453 so we force application to retry to set
454 the correct hardware parameter settings */
455 runtime->status->state = SNDRV_PCM_STATE_OPEN;
456 if (substream->ops->hw_free != NULL)
457 substream->ops->hw_free(substream);
458 return err;
459 }
460
461 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
462 struct snd_pcm_hw_params __user * _params)
463 {
464 struct snd_pcm_hw_params *params;
465 int err;
466
467 params = kmalloc(sizeof(*params), GFP_KERNEL);
468 if (!params) {
469 err = -ENOMEM;
470 goto out;
471 }
472 if (copy_from_user(params, _params, sizeof(*params))) {
473 err = -EFAULT;
474 goto out;
475 }
476 err = snd_pcm_hw_params(substream, params);
477 if (copy_to_user(_params, params, sizeof(*params))) {
478 if (!err)
479 err = -EFAULT;
480 }
481 out:
482 kfree(params);
483 return err;
484 }
485
486 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
487 {
488 struct snd_pcm_runtime *runtime;
489 int result = 0;
490
491 snd_assert(substream != NULL, return -ENXIO);
492 runtime = substream->runtime;
493 snd_assert(runtime != NULL, return -ENXIO);
494 snd_pcm_stream_lock_irq(substream);
495 switch (runtime->status->state) {
496 case SNDRV_PCM_STATE_SETUP:
497 case SNDRV_PCM_STATE_PREPARED:
498 break;
499 default:
500 snd_pcm_stream_unlock_irq(substream);
501 return -EBADFD;
502 }
503 snd_pcm_stream_unlock_irq(substream);
504 if (atomic_read(&substream->mmap_count))
505 return -EBADFD;
506 if (substream->ops->hw_free)
507 result = substream->ops->hw_free(substream);
508 runtime->status->state = SNDRV_PCM_STATE_OPEN;
509 remove_acceptable_latency(substream->latency_id);
510 return result;
511 }
512
513 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
514 struct snd_pcm_sw_params *params)
515 {
516 struct snd_pcm_runtime *runtime;
517
518 snd_assert(substream != NULL, return -ENXIO);
519 runtime = substream->runtime;
520 snd_assert(runtime != NULL, return -ENXIO);
521 snd_pcm_stream_lock_irq(substream);
522 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
523 snd_pcm_stream_unlock_irq(substream);
524 return -EBADFD;
525 }
526 snd_pcm_stream_unlock_irq(substream);
527
528 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
529 return -EINVAL;
530 if (params->avail_min == 0)
531 return -EINVAL;
532 if (params->silence_size >= runtime->boundary) {
533 if (params->silence_threshold != 0)
534 return -EINVAL;
535 } else {
536 if (params->silence_size > params->silence_threshold)
537 return -EINVAL;
538 if (params->silence_threshold > runtime->buffer_size)
539 return -EINVAL;
540 }
541 snd_pcm_stream_lock_irq(substream);
542 runtime->tstamp_mode = params->tstamp_mode;
543 runtime->period_step = params->period_step;
544 runtime->control->avail_min = params->avail_min;
545 runtime->start_threshold = params->start_threshold;
546 runtime->stop_threshold = params->stop_threshold;
547 runtime->silence_threshold = params->silence_threshold;
548 runtime->silence_size = params->silence_size;
549 params->boundary = runtime->boundary;
550 if (snd_pcm_running(substream)) {
551 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
552 runtime->silence_size > 0)
553 snd_pcm_playback_silence(substream, ULONG_MAX);
554 wake_up(&runtime->sleep);
555 }
556 snd_pcm_stream_unlock_irq(substream);
557 return 0;
558 }
559
560 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
561 struct snd_pcm_sw_params __user * _params)
562 {
563 struct snd_pcm_sw_params params;
564 int err;
565 if (copy_from_user(&params, _params, sizeof(params)))
566 return -EFAULT;
567 err = snd_pcm_sw_params(substream, &params);
568 if (copy_to_user(_params, &params, sizeof(params)))
569 return -EFAULT;
570 return err;
571 }
572
573 int snd_pcm_status(struct snd_pcm_substream *substream,
574 struct snd_pcm_status *status)
575 {
576 struct snd_pcm_runtime *runtime = substream->runtime;
577
578 snd_pcm_stream_lock_irq(substream);
579 status->state = runtime->status->state;
580 status->suspended_state = runtime->status->suspended_state;
581 if (status->state == SNDRV_PCM_STATE_OPEN)
582 goto _end;
583 status->trigger_tstamp = runtime->trigger_tstamp;
584 if (snd_pcm_running(substream))
585 snd_pcm_update_hw_ptr(substream);
586 snd_pcm_gettime(runtime, &status->tstamp);
587 status->appl_ptr = runtime->control->appl_ptr;
588 status->hw_ptr = runtime->status->hw_ptr;
589 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
590 status->avail = snd_pcm_playback_avail(runtime);
591 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
592 runtime->status->state == SNDRV_PCM_STATE_DRAINING)
593 status->delay = runtime->buffer_size - status->avail;
594 else
595 status->delay = 0;
596 } else {
597 status->avail = snd_pcm_capture_avail(runtime);
598 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
599 status->delay = status->avail;
600 else
601 status->delay = 0;
602 }
603 status->avail_max = runtime->avail_max;
604 status->overrange = runtime->overrange;
605 runtime->avail_max = 0;
606 runtime->overrange = 0;
607 _end:
608 snd_pcm_stream_unlock_irq(substream);
609 return 0;
610 }
611
612 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
613 struct snd_pcm_status __user * _status)
614 {
615 struct snd_pcm_status status;
616 struct snd_pcm_runtime *runtime;
617 int res;
618
619 snd_assert(substream != NULL, return -ENXIO);
620 runtime = substream->runtime;
621 memset(&status, 0, sizeof(status));
622 res = snd_pcm_status(substream, &status);
623 if (res < 0)
624 return res;
625 if (copy_to_user(_status, &status, sizeof(status)))
626 return -EFAULT;
627 return 0;
628 }
629
630 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
631 struct snd_pcm_channel_info * info)
632 {
633 struct snd_pcm_runtime *runtime;
634 unsigned int channel;
635
636 snd_assert(substream != NULL, return -ENXIO);
637 channel = info->channel;
638 runtime = substream->runtime;
639 snd_pcm_stream_lock_irq(substream);
640 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
641 snd_pcm_stream_unlock_irq(substream);
642 return -EBADFD;
643 }
644 snd_pcm_stream_unlock_irq(substream);
645 if (channel >= runtime->channels)
646 return -EINVAL;
647 memset(info, 0, sizeof(*info));
648 info->channel = channel;
649 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
650 }
651
652 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
653 struct snd_pcm_channel_info __user * _info)
654 {
655 struct snd_pcm_channel_info info;
656 int res;
657
658 if (copy_from_user(&info, _info, sizeof(info)))
659 return -EFAULT;
660 res = snd_pcm_channel_info(substream, &info);
661 if (res < 0)
662 return res;
663 if (copy_to_user(_info, &info, sizeof(info)))
664 return -EFAULT;
665 return 0;
666 }
667
668 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
669 {
670 struct snd_pcm_runtime *runtime = substream->runtime;
671 if (runtime->trigger_master == NULL)
672 return;
673 if (runtime->trigger_master == substream) {
674 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
675 } else {
676 snd_pcm_trigger_tstamp(runtime->trigger_master);
677 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
678 }
679 runtime->trigger_master = NULL;
680 }
681
682 struct action_ops {
683 int (*pre_action)(struct snd_pcm_substream *substream, int state);
684 int (*do_action)(struct snd_pcm_substream *substream, int state);
685 void (*undo_action)(struct snd_pcm_substream *substream, int state);
686 void (*post_action)(struct snd_pcm_substream *substream, int state);
687 };
688
689 /*
690 * this functions is core for handling of linked stream
691 * Note: the stream state might be changed also on failure
692 * Note2: call with calling stream lock + link lock
693 */
694 static int snd_pcm_action_group(struct action_ops *ops,
695 struct snd_pcm_substream *substream,
696 int state, int do_lock)
697 {
698 struct snd_pcm_substream *s = NULL;
699 struct snd_pcm_substream *s1;
700 int res = 0;
701
702 snd_pcm_group_for_each_entry(s, substream) {
703 if (do_lock && s != substream)
704 spin_lock_nested(&s->self_group.lock,
705 SINGLE_DEPTH_NESTING);
706 res = ops->pre_action(s, state);
707 if (res < 0)
708 goto _unlock;
709 }
710 snd_pcm_group_for_each_entry(s, substream) {
711 res = ops->do_action(s, state);
712 if (res < 0) {
713 if (ops->undo_action) {
714 snd_pcm_group_for_each_entry(s1, substream) {
715 if (s1 == s) /* failed stream */
716 break;
717 ops->undo_action(s1, state);
718 }
719 }
720 s = NULL; /* unlock all */
721 goto _unlock;
722 }
723 }
724 snd_pcm_group_for_each_entry(s, substream) {
725 ops->post_action(s, state);
726 }
727 _unlock:
728 if (do_lock) {
729 /* unlock streams */
730 snd_pcm_group_for_each_entry(s1, substream) {
731 if (s1 != substream)
732 spin_unlock(&s1->self_group.lock);
733 if (s1 == s) /* end */
734 break;
735 }
736 }
737 return res;
738 }
739
740 /*
741 * Note: call with stream lock
742 */
743 static int snd_pcm_action_single(struct action_ops *ops,
744 struct snd_pcm_substream *substream,
745 int state)
746 {
747 int res;
748
749 res = ops->pre_action(substream, state);
750 if (res < 0)
751 return res;
752 res = ops->do_action(substream, state);
753 if (res == 0)
754 ops->post_action(substream, state);
755 else if (ops->undo_action)
756 ops->undo_action(substream, state);
757 return res;
758 }
759
760 /*
761 * Note: call with stream lock
762 */
763 static int snd_pcm_action(struct action_ops *ops,
764 struct snd_pcm_substream *substream,
765 int state)
766 {
767 int res;
768
769 if (snd_pcm_stream_linked(substream)) {
770 if (!spin_trylock(&substream->group->lock)) {
771 spin_unlock(&substream->self_group.lock);
772 spin_lock(&substream->group->lock);
773 spin_lock(&substream->self_group.lock);
774 }
775 res = snd_pcm_action_group(ops, substream, state, 1);
776 spin_unlock(&substream->group->lock);
777 } else {
778 res = snd_pcm_action_single(ops, substream, state);
779 }
780 return res;
781 }
782
783 /*
784 * Note: don't use any locks before
785 */
786 static int snd_pcm_action_lock_irq(struct action_ops *ops,
787 struct snd_pcm_substream *substream,
788 int state)
789 {
790 int res;
791
792 read_lock_irq(&snd_pcm_link_rwlock);
793 if (snd_pcm_stream_linked(substream)) {
794 spin_lock(&substream->group->lock);
795 spin_lock(&substream->self_group.lock);
796 res = snd_pcm_action_group(ops, substream, state, 1);
797 spin_unlock(&substream->self_group.lock);
798 spin_unlock(&substream->group->lock);
799 } else {
800 spin_lock(&substream->self_group.lock);
801 res = snd_pcm_action_single(ops, substream, state);
802 spin_unlock(&substream->self_group.lock);
803 }
804 read_unlock_irq(&snd_pcm_link_rwlock);
805 return res;
806 }
807
808 /*
809 */
810 static int snd_pcm_action_nonatomic(struct action_ops *ops,
811 struct snd_pcm_substream *substream,
812 int state)
813 {
814 int res;
815
816 down_read(&snd_pcm_link_rwsem);
817 if (snd_pcm_stream_linked(substream))
818 res = snd_pcm_action_group(ops, substream, state, 0);
819 else
820 res = snd_pcm_action_single(ops, substream, state);
821 up_read(&snd_pcm_link_rwsem);
822 return res;
823 }
824
825 /*
826 * start callbacks
827 */
828 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
829 {
830 struct snd_pcm_runtime *runtime = substream->runtime;
831 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
832 return -EBADFD;
833 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
834 !snd_pcm_playback_data(substream))
835 return -EPIPE;
836 runtime->trigger_master = substream;
837 return 0;
838 }
839
840 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
841 {
842 if (substream->runtime->trigger_master != substream)
843 return 0;
844 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
845 }
846
847 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
848 {
849 if (substream->runtime->trigger_master == substream)
850 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
851 }
852
853 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
854 {
855 struct snd_pcm_runtime *runtime = substream->runtime;
856 snd_pcm_trigger_tstamp(substream);
857 runtime->status->state = state;
858 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
859 runtime->silence_size > 0)
860 snd_pcm_playback_silence(substream, ULONG_MAX);
861 if (substream->timer)
862 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
863 &runtime->trigger_tstamp);
864 }
865
866 static struct action_ops snd_pcm_action_start = {
867 .pre_action = snd_pcm_pre_start,
868 .do_action = snd_pcm_do_start,
869 .undo_action = snd_pcm_undo_start,
870 .post_action = snd_pcm_post_start
871 };
872
873 /**
874 * snd_pcm_start
875 * @substream: the PCM substream instance
876 *
877 * Start all linked streams.
878 */
879 int snd_pcm_start(struct snd_pcm_substream *substream)
880 {
881 return snd_pcm_action(&snd_pcm_action_start, substream,
882 SNDRV_PCM_STATE_RUNNING);
883 }
884
885 /*
886 * stop callbacks
887 */
888 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
889 {
890 struct snd_pcm_runtime *runtime = substream->runtime;
891 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
892 return -EBADFD;
893 runtime->trigger_master = substream;
894 return 0;
895 }
896
897 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
898 {
899 if (substream->runtime->trigger_master == substream &&
900 snd_pcm_running(substream))
901 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
902 return 0; /* unconditonally stop all substreams */
903 }
904
905 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
906 {
907 struct snd_pcm_runtime *runtime = substream->runtime;
908 if (runtime->status->state != state) {
909 snd_pcm_trigger_tstamp(substream);
910 if (substream->timer)
911 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
912 &runtime->trigger_tstamp);
913 runtime->status->state = state;
914 }
915 wake_up(&runtime->sleep);
916 }
917
918 static struct action_ops snd_pcm_action_stop = {
919 .pre_action = snd_pcm_pre_stop,
920 .do_action = snd_pcm_do_stop,
921 .post_action = snd_pcm_post_stop
922 };
923
924 /**
925 * snd_pcm_stop
926 * @substream: the PCM substream instance
927 * @state: PCM state after stopping the stream
928 *
929 * Try to stop all running streams in the substream group.
930 * The state of each stream is changed to the given value after that unconditionally.
931 */
932 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
933 {
934 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
935 }
936
937 EXPORT_SYMBOL(snd_pcm_stop);
938
939 /**
940 * snd_pcm_drain_done
941 * @substream: the PCM substream
942 *
943 * Stop the DMA only when the given stream is playback.
944 * The state is changed to SETUP.
945 * Unlike snd_pcm_stop(), this affects only the given stream.
946 */
947 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
948 {
949 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
950 SNDRV_PCM_STATE_SETUP);
951 }
952
953 /*
954 * pause callbacks
955 */
956 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
957 {
958 struct snd_pcm_runtime *runtime = substream->runtime;
959 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
960 return -ENOSYS;
961 if (push) {
962 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
963 return -EBADFD;
964 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
965 return -EBADFD;
966 runtime->trigger_master = substream;
967 return 0;
968 }
969
970 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
971 {
972 if (substream->runtime->trigger_master != substream)
973 return 0;
974 return substream->ops->trigger(substream,
975 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
976 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
977 }
978
979 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
980 {
981 if (substream->runtime->trigger_master == substream)
982 substream->ops->trigger(substream,
983 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
984 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
985 }
986
987 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
988 {
989 struct snd_pcm_runtime *runtime = substream->runtime;
990 snd_pcm_trigger_tstamp(substream);
991 if (push) {
992 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
993 if (substream->timer)
994 snd_timer_notify(substream->timer,
995 SNDRV_TIMER_EVENT_MPAUSE,
996 &runtime->trigger_tstamp);
997 wake_up(&runtime->sleep);
998 } else {
999 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1000 if (substream->timer)
1001 snd_timer_notify(substream->timer,
1002 SNDRV_TIMER_EVENT_MCONTINUE,
1003 &runtime->trigger_tstamp);
1004 }
1005 }
1006
1007 static struct action_ops snd_pcm_action_pause = {
1008 .pre_action = snd_pcm_pre_pause,
1009 .do_action = snd_pcm_do_pause,
1010 .undo_action = snd_pcm_undo_pause,
1011 .post_action = snd_pcm_post_pause
1012 };
1013
1014 /*
1015 * Push/release the pause for all linked streams.
1016 */
1017 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1018 {
1019 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1020 }
1021
1022 #ifdef CONFIG_PM
1023 /* suspend */
1024
1025 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1026 {
1027 struct snd_pcm_runtime *runtime = substream->runtime;
1028 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1029 return -EBUSY;
1030 runtime->trigger_master = substream;
1031 return 0;
1032 }
1033
1034 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1035 {
1036 struct snd_pcm_runtime *runtime = substream->runtime;
1037 if (runtime->trigger_master != substream)
1038 return 0;
1039 if (! snd_pcm_running(substream))
1040 return 0;
1041 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1042 return 0; /* suspend unconditionally */
1043 }
1044
1045 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1046 {
1047 struct snd_pcm_runtime *runtime = substream->runtime;
1048 snd_pcm_trigger_tstamp(substream);
1049 if (substream->timer)
1050 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1051 &runtime->trigger_tstamp);
1052 runtime->status->suspended_state = runtime->status->state;
1053 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1054 wake_up(&runtime->sleep);
1055 }
1056
1057 static struct action_ops snd_pcm_action_suspend = {
1058 .pre_action = snd_pcm_pre_suspend,
1059 .do_action = snd_pcm_do_suspend,
1060 .post_action = snd_pcm_post_suspend
1061 };
1062
1063 /**
1064 * snd_pcm_suspend
1065 * @substream: the PCM substream
1066 *
1067 * Trigger SUSPEND to all linked streams.
1068 * After this call, all streams are changed to SUSPENDED state.
1069 */
1070 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1071 {
1072 int err;
1073 unsigned long flags;
1074
1075 if (! substream)
1076 return 0;
1077
1078 snd_pcm_stream_lock_irqsave(substream, flags);
1079 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1080 snd_pcm_stream_unlock_irqrestore(substream, flags);
1081 return err;
1082 }
1083
1084 EXPORT_SYMBOL(snd_pcm_suspend);
1085
1086 /**
1087 * snd_pcm_suspend_all
1088 * @pcm: the PCM instance
1089 *
1090 * Trigger SUSPEND to all substreams in the given pcm.
1091 * After this call, all streams are changed to SUSPENDED state.
1092 */
1093 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1094 {
1095 struct snd_pcm_substream *substream;
1096 int stream, err = 0;
1097
1098 if (! pcm)
1099 return 0;
1100
1101 for (stream = 0; stream < 2; stream++) {
1102 for (substream = pcm->streams[stream].substream;
1103 substream; substream = substream->next) {
1104 /* FIXME: the open/close code should lock this as well */
1105 if (substream->runtime == NULL)
1106 continue;
1107 err = snd_pcm_suspend(substream);
1108 if (err < 0 && err != -EBUSY)
1109 return err;
1110 }
1111 }
1112 return 0;
1113 }
1114
1115 EXPORT_SYMBOL(snd_pcm_suspend_all);
1116
1117 /* resume */
1118
1119 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1120 {
1121 struct snd_pcm_runtime *runtime = substream->runtime;
1122 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1123 return -ENOSYS;
1124 runtime->trigger_master = substream;
1125 return 0;
1126 }
1127
1128 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1129 {
1130 struct snd_pcm_runtime *runtime = substream->runtime;
1131 if (runtime->trigger_master != substream)
1132 return 0;
1133 /* DMA not running previously? */
1134 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1135 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1136 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1137 return 0;
1138 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1139 }
1140
1141 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1142 {
1143 if (substream->runtime->trigger_master == substream &&
1144 snd_pcm_running(substream))
1145 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1146 }
1147
1148 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1149 {
1150 struct snd_pcm_runtime *runtime = substream->runtime;
1151 snd_pcm_trigger_tstamp(substream);
1152 if (substream->timer)
1153 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1154 &runtime->trigger_tstamp);
1155 runtime->status->state = runtime->status->suspended_state;
1156 }
1157
1158 static struct action_ops snd_pcm_action_resume = {
1159 .pre_action = snd_pcm_pre_resume,
1160 .do_action = snd_pcm_do_resume,
1161 .undo_action = snd_pcm_undo_resume,
1162 .post_action = snd_pcm_post_resume
1163 };
1164
1165 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1166 {
1167 struct snd_card *card = substream->pcm->card;
1168 int res;
1169
1170 snd_power_lock(card);
1171 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1172 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1173 snd_power_unlock(card);
1174 return res;
1175 }
1176
1177 #else
1178
1179 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1180 {
1181 return -ENOSYS;
1182 }
1183
1184 #endif /* CONFIG_PM */
1185
1186 /*
1187 * xrun ioctl
1188 *
1189 * Change the RUNNING stream(s) to XRUN state.
1190 */
1191 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1192 {
1193 struct snd_card *card = substream->pcm->card;
1194 struct snd_pcm_runtime *runtime = substream->runtime;
1195 int result;
1196
1197 snd_power_lock(card);
1198 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1199 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1200 if (result < 0)
1201 goto _unlock;
1202 }
1203
1204 snd_pcm_stream_lock_irq(substream);
1205 switch (runtime->status->state) {
1206 case SNDRV_PCM_STATE_XRUN:
1207 result = 0; /* already there */
1208 break;
1209 case SNDRV_PCM_STATE_RUNNING:
1210 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1211 break;
1212 default:
1213 result = -EBADFD;
1214 }
1215 snd_pcm_stream_unlock_irq(substream);
1216 _unlock:
1217 snd_power_unlock(card);
1218 return result;
1219 }
1220
1221 /*
1222 * reset ioctl
1223 */
1224 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1225 {
1226 struct snd_pcm_runtime *runtime = substream->runtime;
1227 switch (runtime->status->state) {
1228 case SNDRV_PCM_STATE_RUNNING:
1229 case SNDRV_PCM_STATE_PREPARED:
1230 case SNDRV_PCM_STATE_PAUSED:
1231 case SNDRV_PCM_STATE_SUSPENDED:
1232 return 0;
1233 default:
1234 return -EBADFD;
1235 }
1236 }
1237
1238 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1239 {
1240 struct snd_pcm_runtime *runtime = substream->runtime;
1241 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1242 if (err < 0)
1243 return err;
1244 // snd_assert(runtime->status->hw_ptr < runtime->buffer_size, );
1245 runtime->hw_ptr_base = 0;
1246 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1247 runtime->status->hw_ptr % runtime->period_size;
1248 runtime->silence_start = runtime->status->hw_ptr;
1249 runtime->silence_filled = 0;
1250 return 0;
1251 }
1252
1253 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1254 {
1255 struct snd_pcm_runtime *runtime = substream->runtime;
1256 runtime->control->appl_ptr = runtime->status->hw_ptr;
1257 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1258 runtime->silence_size > 0)
1259 snd_pcm_playback_silence(substream, ULONG_MAX);
1260 }
1261
1262 static struct action_ops snd_pcm_action_reset = {
1263 .pre_action = snd_pcm_pre_reset,
1264 .do_action = snd_pcm_do_reset,
1265 .post_action = snd_pcm_post_reset
1266 };
1267
1268 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1269 {
1270 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1271 }
1272
1273 /*
1274 * prepare ioctl
1275 */
1276 /* we use the second argument for updating f_flags */
1277 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1278 int f_flags)
1279 {
1280 struct snd_pcm_runtime *runtime = substream->runtime;
1281 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1282 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1283 return -EBADFD;
1284 if (snd_pcm_running(substream))
1285 return -EBUSY;
1286 substream->f_flags = f_flags;
1287 return 0;
1288 }
1289
1290 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1291 {
1292 int err;
1293 err = substream->ops->prepare(substream);
1294 if (err < 0)
1295 return err;
1296 return snd_pcm_do_reset(substream, 0);
1297 }
1298
1299 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1300 {
1301 struct snd_pcm_runtime *runtime = substream->runtime;
1302 runtime->control->appl_ptr = runtime->status->hw_ptr;
1303 runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1304 }
1305
1306 static struct action_ops snd_pcm_action_prepare = {
1307 .pre_action = snd_pcm_pre_prepare,
1308 .do_action = snd_pcm_do_prepare,
1309 .post_action = snd_pcm_post_prepare
1310 };
1311
1312 /**
1313 * snd_pcm_prepare
1314 * @substream: the PCM substream instance
1315 * @file: file to refer f_flags
1316 *
1317 * Prepare the PCM substream to be triggerable.
1318 */
1319 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1320 struct file *file)
1321 {
1322 int res;
1323 struct snd_card *card = substream->pcm->card;
1324 int f_flags;
1325
1326 if (file)
1327 f_flags = file->f_flags;
1328 else
1329 f_flags = substream->f_flags;
1330
1331 snd_power_lock(card);
1332 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1333 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1334 substream, f_flags);
1335 snd_power_unlock(card);
1336 return res;
1337 }
1338
1339 /*
1340 * drain ioctl
1341 */
1342
1343 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1344 {
1345 if (substream->f_flags & O_NONBLOCK)
1346 return -EAGAIN;
1347 substream->runtime->trigger_master = substream;
1348 return 0;
1349 }
1350
1351 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1352 {
1353 struct snd_pcm_runtime *runtime = substream->runtime;
1354 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1355 switch (runtime->status->state) {
1356 case SNDRV_PCM_STATE_PREPARED:
1357 /* start playback stream if possible */
1358 if (! snd_pcm_playback_empty(substream)) {
1359 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1360 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1361 }
1362 break;
1363 case SNDRV_PCM_STATE_RUNNING:
1364 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1365 break;
1366 default:
1367 break;
1368 }
1369 } else {
1370 /* stop running stream */
1371 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1372 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1373 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1374 snd_pcm_do_stop(substream, new_state);
1375 snd_pcm_post_stop(substream, new_state);
1376 }
1377 }
1378 return 0;
1379 }
1380
1381 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1382 {
1383 }
1384
1385 static struct action_ops snd_pcm_action_drain_init = {
1386 .pre_action = snd_pcm_pre_drain_init,
1387 .do_action = snd_pcm_do_drain_init,
1388 .post_action = snd_pcm_post_drain_init
1389 };
1390
1391 struct drain_rec {
1392 struct snd_pcm_substream *substream;
1393 wait_queue_t wait;
1394 snd_pcm_uframes_t stop_threshold;
1395 };
1396
1397 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1398
1399 /*
1400 * Drain the stream(s).
1401 * When the substream is linked, sync until the draining of all playback streams
1402 * is finished.
1403 * After this call, all streams are supposed to be either SETUP or DRAINING
1404 * (capture only) state.
1405 */
1406 static int snd_pcm_drain(struct snd_pcm_substream *substream)
1407 {
1408 struct snd_card *card;
1409 struct snd_pcm_runtime *runtime;
1410 struct snd_pcm_substream *s;
1411 int result = 0;
1412 int i, num_drecs;
1413 struct drain_rec *drec, drec_tmp, *d;
1414
1415 snd_assert(substream != NULL, return -ENXIO);
1416 card = substream->pcm->card;
1417 runtime = substream->runtime;
1418
1419 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1420 return -EBADFD;
1421
1422 snd_power_lock(card);
1423 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1424 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1425 if (result < 0) {
1426 snd_power_unlock(card);
1427 return result;
1428 }
1429 }
1430
1431 /* allocate temporary record for drain sync */
1432 down_read(&snd_pcm_link_rwsem);
1433 if (snd_pcm_stream_linked(substream)) {
1434 drec = kmalloc(substream->group->count * sizeof(*drec), GFP_KERNEL);
1435 if (! drec) {
1436 up_read(&snd_pcm_link_rwsem);
1437 snd_power_unlock(card);
1438 return -ENOMEM;
1439 }
1440 } else
1441 drec = &drec_tmp;
1442
1443 /* count only playback streams */
1444 num_drecs = 0;
1445 snd_pcm_group_for_each_entry(s, substream) {
1446 runtime = s->runtime;
1447 if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1448 d = &drec[num_drecs++];
1449 d->substream = s;
1450 init_waitqueue_entry(&d->wait, current);
1451 add_wait_queue(&runtime->sleep, &d->wait);
1452 /* stop_threshold fixup to avoid endless loop when
1453 * stop_threshold > buffer_size
1454 */
1455 d->stop_threshold = runtime->stop_threshold;
1456 if (runtime->stop_threshold > runtime->buffer_size)
1457 runtime->stop_threshold = runtime->buffer_size;
1458 }
1459 }
1460 up_read(&snd_pcm_link_rwsem);
1461
1462 snd_pcm_stream_lock_irq(substream);
1463 /* resume pause */
1464 if (substream->runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1465 snd_pcm_pause(substream, 0);
1466
1467 /* pre-start/stop - all running streams are changed to DRAINING state */
1468 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1469 if (result < 0) {
1470 snd_pcm_stream_unlock_irq(substream);
1471 goto _error;
1472 }
1473
1474 for (;;) {
1475 long tout;
1476 if (signal_pending(current)) {
1477 result = -ERESTARTSYS;
1478 break;
1479 }
1480 /* all finished? */
1481 for (i = 0; i < num_drecs; i++) {
1482 runtime = drec[i].substream->runtime;
1483 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING)
1484 break;
1485 }
1486 if (i == num_drecs)
1487 break; /* yes, all drained */
1488
1489 set_current_state(TASK_INTERRUPTIBLE);
1490 snd_pcm_stream_unlock_irq(substream);
1491 snd_power_unlock(card);
1492 tout = schedule_timeout(10 * HZ);
1493 snd_power_lock(card);
1494 snd_pcm_stream_lock_irq(substream);
1495 if (tout == 0) {
1496 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1497 result = -ESTRPIPE;
1498 else {
1499 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1500 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1501 result = -EIO;
1502 }
1503 break;
1504 }
1505 }
1506
1507 snd_pcm_stream_unlock_irq(substream);
1508
1509 _error:
1510 for (i = 0; i < num_drecs; i++) {
1511 d = &drec[i];
1512 runtime = d->substream->runtime;
1513 remove_wait_queue(&runtime->sleep, &d->wait);
1514 runtime->stop_threshold = d->stop_threshold;
1515 }
1516
1517 if (drec != &drec_tmp)
1518 kfree(drec);
1519 snd_power_unlock(card);
1520
1521 return result;
1522 }
1523
1524 /*
1525 * drop ioctl
1526 *
1527 * Immediately put all linked substreams into SETUP state.
1528 */
1529 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1530 {
1531 struct snd_pcm_runtime *runtime;
1532 struct snd_card *card;
1533 int result = 0;
1534
1535 snd_assert(substream != NULL, return -ENXIO);
1536 runtime = substream->runtime;
1537 card = substream->pcm->card;
1538
1539 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1540 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1541 return -EBADFD;
1542
1543 snd_power_lock(card);
1544 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1545 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1546 if (result < 0)
1547 goto _unlock;
1548 }
1549
1550 snd_pcm_stream_lock_irq(substream);
1551 /* resume pause */
1552 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1553 snd_pcm_pause(substream, 0);
1554
1555 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1556 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1557 snd_pcm_stream_unlock_irq(substream);
1558 _unlock:
1559 snd_power_unlock(card);
1560 return result;
1561 }
1562
1563
1564 /* WARNING: Don't forget to fput back the file */
1565 static struct file *snd_pcm_file_fd(int fd)
1566 {
1567 struct file *file;
1568 struct inode *inode;
1569 unsigned int minor;
1570
1571 file = fget(fd);
1572 if (!file)
1573 return NULL;
1574 inode = file->f_path.dentry->d_inode;
1575 if (!S_ISCHR(inode->i_mode) ||
1576 imajor(inode) != snd_major) {
1577 fput(file);
1578 return NULL;
1579 }
1580 minor = iminor(inode);
1581 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1582 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1583 fput(file);
1584 return NULL;
1585 }
1586 return file;
1587 }
1588
1589 /*
1590 * PCM link handling
1591 */
1592 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1593 {
1594 int res = 0;
1595 struct file *file;
1596 struct snd_pcm_file *pcm_file;
1597 struct snd_pcm_substream *substream1;
1598
1599 file = snd_pcm_file_fd(fd);
1600 if (!file)
1601 return -EBADFD;
1602 pcm_file = file->private_data;
1603 substream1 = pcm_file->substream;
1604 down_write(&snd_pcm_link_rwsem);
1605 write_lock_irq(&snd_pcm_link_rwlock);
1606 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1607 substream->runtime->status->state != substream1->runtime->status->state) {
1608 res = -EBADFD;
1609 goto _end;
1610 }
1611 if (snd_pcm_stream_linked(substream1)) {
1612 res = -EALREADY;
1613 goto _end;
1614 }
1615 if (!snd_pcm_stream_linked(substream)) {
1616 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1617 if (substream->group == NULL) {
1618 res = -ENOMEM;
1619 goto _end;
1620 }
1621 spin_lock_init(&substream->group->lock);
1622 INIT_LIST_HEAD(&substream->group->substreams);
1623 list_add_tail(&substream->link_list, &substream->group->substreams);
1624 substream->group->count = 1;
1625 }
1626 list_add_tail(&substream1->link_list, &substream->group->substreams);
1627 substream->group->count++;
1628 substream1->group = substream->group;
1629 _end:
1630 write_unlock_irq(&snd_pcm_link_rwlock);
1631 up_write(&snd_pcm_link_rwsem);
1632 fput(file);
1633 return res;
1634 }
1635
1636 static void relink_to_local(struct snd_pcm_substream *substream)
1637 {
1638 substream->group = &substream->self_group;
1639 INIT_LIST_HEAD(&substream->self_group.substreams);
1640 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1641 }
1642
1643 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1644 {
1645 struct snd_pcm_substream *s;
1646 int res = 0;
1647
1648 down_write(&snd_pcm_link_rwsem);
1649 write_lock_irq(&snd_pcm_link_rwlock);
1650 if (!snd_pcm_stream_linked(substream)) {
1651 res = -EALREADY;
1652 goto _end;
1653 }
1654 list_del(&substream->link_list);
1655 substream->group->count--;
1656 if (substream->group->count == 1) { /* detach the last stream, too */
1657 snd_pcm_group_for_each_entry(s, substream) {
1658 relink_to_local(s);
1659 break;
1660 }
1661 kfree(substream->group);
1662 }
1663 relink_to_local(substream);
1664 _end:
1665 write_unlock_irq(&snd_pcm_link_rwlock);
1666 up_write(&snd_pcm_link_rwsem);
1667 return res;
1668 }
1669
1670 /*
1671 * hw configurator
1672 */
1673 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1674 struct snd_pcm_hw_rule *rule)
1675 {
1676 struct snd_interval t;
1677 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1678 hw_param_interval_c(params, rule->deps[1]), &t);
1679 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1680 }
1681
1682 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1683 struct snd_pcm_hw_rule *rule)
1684 {
1685 struct snd_interval t;
1686 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1687 hw_param_interval_c(params, rule->deps[1]), &t);
1688 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1689 }
1690
1691 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1692 struct snd_pcm_hw_rule *rule)
1693 {
1694 struct snd_interval t;
1695 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1696 hw_param_interval_c(params, rule->deps[1]),
1697 (unsigned long) rule->private, &t);
1698 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1699 }
1700
1701 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1702 struct snd_pcm_hw_rule *rule)
1703 {
1704 struct snd_interval t;
1705 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1706 (unsigned long) rule->private,
1707 hw_param_interval_c(params, rule->deps[1]), &t);
1708 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1709 }
1710
1711 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1712 struct snd_pcm_hw_rule *rule)
1713 {
1714 unsigned int k;
1715 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1716 struct snd_mask m;
1717 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1718 snd_mask_any(&m);
1719 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1720 int bits;
1721 if (! snd_mask_test(mask, k))
1722 continue;
1723 bits = snd_pcm_format_physical_width(k);
1724 if (bits <= 0)
1725 continue; /* ignore invalid formats */
1726 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1727 snd_mask_reset(&m, k);
1728 }
1729 return snd_mask_refine(mask, &m);
1730 }
1731
1732 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1733 struct snd_pcm_hw_rule *rule)
1734 {
1735 struct snd_interval t;
1736 unsigned int k;
1737 t.min = UINT_MAX;
1738 t.max = 0;
1739 t.openmin = 0;
1740 t.openmax = 0;
1741 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1742 int bits;
1743 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1744 continue;
1745 bits = snd_pcm_format_physical_width(k);
1746 if (bits <= 0)
1747 continue; /* ignore invalid formats */
1748 if (t.min > (unsigned)bits)
1749 t.min = bits;
1750 if (t.max < (unsigned)bits)
1751 t.max = bits;
1752 }
1753 t.integer = 1;
1754 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1755 }
1756
1757 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1758 #error "Change this table"
1759 #endif
1760
1761 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1762 48000, 64000, 88200, 96000, 176400, 192000 };
1763
1764 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1765 .count = ARRAY_SIZE(rates),
1766 .list = rates,
1767 };
1768
1769 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1770 struct snd_pcm_hw_rule *rule)
1771 {
1772 struct snd_pcm_hardware *hw = rule->private;
1773 return snd_interval_list(hw_param_interval(params, rule->var),
1774 snd_pcm_known_rates.count,
1775 snd_pcm_known_rates.list, hw->rates);
1776 }
1777
1778 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1779 struct snd_pcm_hw_rule *rule)
1780 {
1781 struct snd_interval t;
1782 struct snd_pcm_substream *substream = rule->private;
1783 t.min = 0;
1784 t.max = substream->buffer_bytes_max;
1785 t.openmin = 0;
1786 t.openmax = 0;
1787 t.integer = 1;
1788 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1789 }
1790
1791 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1792 {
1793 struct snd_pcm_runtime *runtime = substream->runtime;
1794 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1795 int k, err;
1796
1797 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1798 snd_mask_any(constrs_mask(constrs, k));
1799 }
1800
1801 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1802 snd_interval_any(constrs_interval(constrs, k));
1803 }
1804
1805 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1806 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1807 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1808 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1809 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1810
1811 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1812 snd_pcm_hw_rule_format, NULL,
1813 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1814 if (err < 0)
1815 return err;
1816 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1817 snd_pcm_hw_rule_sample_bits, NULL,
1818 SNDRV_PCM_HW_PARAM_FORMAT,
1819 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1820 if (err < 0)
1821 return err;
1822 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1823 snd_pcm_hw_rule_div, NULL,
1824 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1825 if (err < 0)
1826 return err;
1827 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1828 snd_pcm_hw_rule_mul, NULL,
1829 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1830 if (err < 0)
1831 return err;
1832 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1833 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1834 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1835 if (err < 0)
1836 return err;
1837 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1838 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1839 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1840 if (err < 0)
1841 return err;
1842 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1843 snd_pcm_hw_rule_div, NULL,
1844 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1845 if (err < 0)
1846 return err;
1847 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1848 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1849 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1850 if (err < 0)
1851 return err;
1852 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1853 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1854 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1855 if (err < 0)
1856 return err;
1857 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1858 snd_pcm_hw_rule_div, NULL,
1859 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1860 if (err < 0)
1861 return err;
1862 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1863 snd_pcm_hw_rule_div, NULL,
1864 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1865 if (err < 0)
1866 return err;
1867 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1868 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1869 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1870 if (err < 0)
1871 return err;
1872 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1873 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1874 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1875 if (err < 0)
1876 return err;
1877 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1878 snd_pcm_hw_rule_mul, NULL,
1879 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1880 if (err < 0)
1881 return err;
1882 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1883 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1884 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1885 if (err < 0)
1886 return err;
1887 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1888 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1889 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1890 if (err < 0)
1891 return err;
1892 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1893 snd_pcm_hw_rule_muldivk, (void*) 8,
1894 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1895 if (err < 0)
1896 return err;
1897 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1898 snd_pcm_hw_rule_muldivk, (void*) 8,
1899 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1900 if (err < 0)
1901 return err;
1902 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1903 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1904 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1905 if (err < 0)
1906 return err;
1907 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1908 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1909 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1910 if (err < 0)
1911 return err;
1912 return 0;
1913 }
1914
1915 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1916 {
1917 struct snd_pcm_runtime *runtime = substream->runtime;
1918 struct snd_pcm_hardware *hw = &runtime->hw;
1919 int err;
1920 unsigned int mask = 0;
1921
1922 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1923 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1924 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1925 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1926 if (hw->info & SNDRV_PCM_INFO_MMAP) {
1927 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1928 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1929 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1930 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1931 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1932 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1933 }
1934 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1935 snd_assert(err >= 0, return -EINVAL);
1936
1937 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1938 snd_assert(err >= 0, return -EINVAL);
1939
1940 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1941 snd_assert(err >= 0, return -EINVAL);
1942
1943 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1944 hw->channels_min, hw->channels_max);
1945 snd_assert(err >= 0, return -EINVAL);
1946
1947 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1948 hw->rate_min, hw->rate_max);
1949 snd_assert(err >= 0, return -EINVAL);
1950
1951 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1952 hw->period_bytes_min, hw->period_bytes_max);
1953 snd_assert(err >= 0, return -EINVAL);
1954
1955 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1956 hw->periods_min, hw->periods_max);
1957 snd_assert(err >= 0, return -EINVAL);
1958
1959 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1960 hw->period_bytes_min, hw->buffer_bytes_max);
1961 snd_assert(err >= 0, return -EINVAL);
1962
1963 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1964 snd_pcm_hw_rule_buffer_bytes_max, substream,
1965 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1966 if (err < 0)
1967 return err;
1968
1969 /* FIXME: remove */
1970 if (runtime->dma_bytes) {
1971 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1972 snd_assert(err >= 0, return -EINVAL);
1973 }
1974
1975 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1976 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1977 snd_pcm_hw_rule_rate, hw,
1978 SNDRV_PCM_HW_PARAM_RATE, -1);
1979 if (err < 0)
1980 return err;
1981 }
1982
1983 /* FIXME: this belong to lowlevel */
1984 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1985
1986 return 0;
1987 }
1988
1989 static void pcm_release_private(struct snd_pcm_substream *substream)
1990 {
1991 snd_pcm_unlink(substream);
1992 }
1993
1994 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
1995 {
1996 substream->ref_count--;
1997 if (substream->ref_count > 0)
1998 return;
1999
2000 snd_pcm_drop(substream);
2001 if (substream->hw_opened) {
2002 if (substream->ops->hw_free != NULL)
2003 substream->ops->hw_free(substream);
2004 substream->ops->close(substream);
2005 substream->hw_opened = 0;
2006 }
2007 if (substream->pcm_release) {
2008 substream->pcm_release(substream);
2009 substream->pcm_release = NULL;
2010 }
2011 snd_pcm_detach_substream(substream);
2012 }
2013
2014 EXPORT_SYMBOL(snd_pcm_release_substream);
2015
2016 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2017 struct file *file,
2018 struct snd_pcm_substream **rsubstream)
2019 {
2020 struct snd_pcm_substream *substream;
2021 int err;
2022
2023 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2024 if (err < 0)
2025 return err;
2026 if (substream->ref_count > 1) {
2027 *rsubstream = substream;
2028 return 0;
2029 }
2030
2031 err = snd_pcm_hw_constraints_init(substream);
2032 if (err < 0) {
2033 snd_printd("snd_pcm_hw_constraints_init failed\n");
2034 goto error;
2035 }
2036
2037 if ((err = substream->ops->open(substream)) < 0)
2038 goto error;
2039
2040 substream->hw_opened = 1;
2041
2042 err = snd_pcm_hw_constraints_complete(substream);
2043 if (err < 0) {
2044 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2045 goto error;
2046 }
2047
2048 *rsubstream = substream;
2049 return 0;
2050
2051 error:
2052 snd_pcm_release_substream(substream);
2053 return err;
2054 }
2055
2056 EXPORT_SYMBOL(snd_pcm_open_substream);
2057
2058 static int snd_pcm_open_file(struct file *file,
2059 struct snd_pcm *pcm,
2060 int stream,
2061 struct snd_pcm_file **rpcm_file)
2062 {
2063 struct snd_pcm_file *pcm_file;
2064 struct snd_pcm_substream *substream;
2065 struct snd_pcm_str *str;
2066 int err;
2067
2068 snd_assert(rpcm_file != NULL, return -EINVAL);
2069 *rpcm_file = NULL;
2070
2071 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2072 if (err < 0)
2073 return err;
2074
2075 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2076 if (pcm_file == NULL) {
2077 snd_pcm_release_substream(substream);
2078 return -ENOMEM;
2079 }
2080 pcm_file->substream = substream;
2081 if (substream->ref_count == 1) {
2082 str = substream->pstr;
2083 substream->file = pcm_file;
2084 substream->pcm_release = pcm_release_private;
2085 }
2086 file->private_data = pcm_file;
2087 *rpcm_file = pcm_file;
2088 return 0;
2089 }
2090
2091 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2092 {
2093 struct snd_pcm *pcm;
2094
2095 pcm = snd_lookup_minor_data(iminor(inode),
2096 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2097 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2098 }
2099
2100 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2101 {
2102 struct snd_pcm *pcm;
2103
2104 pcm = snd_lookup_minor_data(iminor(inode),
2105 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2106 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2107 }
2108
2109 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2110 {
2111 int err;
2112 struct snd_pcm_file *pcm_file;
2113 wait_queue_t wait;
2114
2115 if (pcm == NULL) {
2116 err = -ENODEV;
2117 goto __error1;
2118 }
2119 err = snd_card_file_add(pcm->card, file);
2120 if (err < 0)
2121 goto __error1;
2122 if (!try_module_get(pcm->card->module)) {
2123 err = -EFAULT;
2124 goto __error2;
2125 }
2126 init_waitqueue_entry(&wait, current);
2127 add_wait_queue(&pcm->open_wait, &wait);
2128 mutex_lock(&pcm->open_mutex);
2129 while (1) {
2130 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2131 if (err >= 0)
2132 break;
2133 if (err == -EAGAIN) {
2134 if (file->f_flags & O_NONBLOCK) {
2135 err = -EBUSY;
2136 break;
2137 }
2138 } else
2139 break;
2140 set_current_state(TASK_INTERRUPTIBLE);
2141 mutex_unlock(&pcm->open_mutex);
2142 schedule();
2143 mutex_lock(&pcm->open_mutex);
2144 if (signal_pending(current)) {
2145 err = -ERESTARTSYS;
2146 break;
2147 }
2148 }
2149 remove_wait_queue(&pcm->open_wait, &wait);
2150 mutex_unlock(&pcm->open_mutex);
2151 if (err < 0)
2152 goto __error;
2153 return err;
2154
2155 __error:
2156 module_put(pcm->card->module);
2157 __error2:
2158 snd_card_file_remove(pcm->card, file);
2159 __error1:
2160 return err;
2161 }
2162
2163 static int snd_pcm_release(struct inode *inode, struct file *file)
2164 {
2165 struct snd_pcm *pcm;
2166 struct snd_pcm_substream *substream;
2167 struct snd_pcm_file *pcm_file;
2168
2169 pcm_file = file->private_data;
2170 substream = pcm_file->substream;
2171 snd_assert(substream != NULL, return -ENXIO);
2172 pcm = substream->pcm;
2173 fasync_helper(-1, file, 0, &substream->runtime->fasync);
2174 mutex_lock(&pcm->open_mutex);
2175 snd_pcm_release_substream(substream);
2176 kfree(pcm_file);
2177 mutex_unlock(&pcm->open_mutex);
2178 wake_up(&pcm->open_wait);
2179 module_put(pcm->card->module);
2180 snd_card_file_remove(pcm->card, file);
2181 return 0;
2182 }
2183
2184 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2185 snd_pcm_uframes_t frames)
2186 {
2187 struct snd_pcm_runtime *runtime = substream->runtime;
2188 snd_pcm_sframes_t appl_ptr;
2189 snd_pcm_sframes_t ret;
2190 snd_pcm_sframes_t hw_avail;
2191
2192 if (frames == 0)
2193 return 0;
2194
2195 snd_pcm_stream_lock_irq(substream);
2196 switch (runtime->status->state) {
2197 case SNDRV_PCM_STATE_PREPARED:
2198 break;
2199 case SNDRV_PCM_STATE_DRAINING:
2200 case SNDRV_PCM_STATE_RUNNING:
2201 if (snd_pcm_update_hw_ptr(substream) >= 0)
2202 break;
2203 /* Fall through */
2204 case SNDRV_PCM_STATE_XRUN:
2205 ret = -EPIPE;
2206 goto __end;
2207 default:
2208 ret = -EBADFD;
2209 goto __end;
2210 }
2211
2212 hw_avail = snd_pcm_playback_hw_avail(runtime);
2213 if (hw_avail <= 0) {
2214 ret = 0;
2215 goto __end;
2216 }
2217 if (frames > (snd_pcm_uframes_t)hw_avail)
2218 frames = hw_avail;
2219 appl_ptr = runtime->control->appl_ptr - frames;
2220 if (appl_ptr < 0)
2221 appl_ptr += runtime->boundary;
2222 runtime->control->appl_ptr = appl_ptr;
2223 ret = frames;
2224 __end:
2225 snd_pcm_stream_unlock_irq(substream);
2226 return ret;
2227 }
2228
2229 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2230 snd_pcm_uframes_t frames)
2231 {
2232 struct snd_pcm_runtime *runtime = substream->runtime;
2233 snd_pcm_sframes_t appl_ptr;
2234 snd_pcm_sframes_t ret;
2235 snd_pcm_sframes_t hw_avail;
2236
2237 if (frames == 0)
2238 return 0;
2239
2240 snd_pcm_stream_lock_irq(substream);
2241 switch (runtime->status->state) {
2242 case SNDRV_PCM_STATE_PREPARED:
2243 case SNDRV_PCM_STATE_DRAINING:
2244 break;
2245 case SNDRV_PCM_STATE_RUNNING:
2246 if (snd_pcm_update_hw_ptr(substream) >= 0)
2247 break;
2248 /* Fall through */
2249 case SNDRV_PCM_STATE_XRUN:
2250 ret = -EPIPE;
2251 goto __end;
2252 default:
2253 ret = -EBADFD;
2254 goto __end;
2255 }
2256
2257 hw_avail = snd_pcm_capture_hw_avail(runtime);
2258 if (hw_avail <= 0) {
2259 ret = 0;
2260 goto __end;
2261 }
2262 if (frames > (snd_pcm_uframes_t)hw_avail)
2263 frames = hw_avail;
2264 appl_ptr = runtime->control->appl_ptr - frames;
2265 if (appl_ptr < 0)
2266 appl_ptr += runtime->boundary;
2267 runtime->control->appl_ptr = appl_ptr;
2268 ret = frames;
2269 __end:
2270 snd_pcm_stream_unlock_irq(substream);
2271 return ret;
2272 }
2273
2274 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2275 snd_pcm_uframes_t frames)
2276 {
2277 struct snd_pcm_runtime *runtime = substream->runtime;
2278 snd_pcm_sframes_t appl_ptr;
2279 snd_pcm_sframes_t ret;
2280 snd_pcm_sframes_t avail;
2281
2282 if (frames == 0)
2283 return 0;
2284
2285 snd_pcm_stream_lock_irq(substream);
2286 switch (runtime->status->state) {
2287 case SNDRV_PCM_STATE_PREPARED:
2288 case SNDRV_PCM_STATE_PAUSED:
2289 break;
2290 case SNDRV_PCM_STATE_DRAINING:
2291 case SNDRV_PCM_STATE_RUNNING:
2292 if (snd_pcm_update_hw_ptr(substream) >= 0)
2293 break;
2294 /* Fall through */
2295 case SNDRV_PCM_STATE_XRUN:
2296 ret = -EPIPE;
2297 goto __end;
2298 default:
2299 ret = -EBADFD;
2300 goto __end;
2301 }
2302
2303 avail = snd_pcm_playback_avail(runtime);
2304 if (avail <= 0) {
2305 ret = 0;
2306 goto __end;
2307 }
2308 if (frames > (snd_pcm_uframes_t)avail)
2309 frames = avail;
2310 appl_ptr = runtime->control->appl_ptr + frames;
2311 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2312 appl_ptr -= runtime->boundary;
2313 runtime->control->appl_ptr = appl_ptr;
2314 ret = frames;
2315 __end:
2316 snd_pcm_stream_unlock_irq(substream);
2317 return ret;
2318 }
2319
2320 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2321 snd_pcm_uframes_t frames)
2322 {
2323 struct snd_pcm_runtime *runtime = substream->runtime;
2324 snd_pcm_sframes_t appl_ptr;
2325 snd_pcm_sframes_t ret;
2326 snd_pcm_sframes_t avail;
2327
2328 if (frames == 0)
2329 return 0;
2330
2331 snd_pcm_stream_lock_irq(substream);
2332 switch (runtime->status->state) {
2333 case SNDRV_PCM_STATE_PREPARED:
2334 case SNDRV_PCM_STATE_DRAINING:
2335 case SNDRV_PCM_STATE_PAUSED:
2336 break;
2337 case SNDRV_PCM_STATE_RUNNING:
2338 if (snd_pcm_update_hw_ptr(substream) >= 0)
2339 break;
2340 /* Fall through */
2341 case SNDRV_PCM_STATE_XRUN:
2342 ret = -EPIPE;
2343 goto __end;
2344 default:
2345 ret = -EBADFD;
2346 goto __end;
2347 }
2348
2349 avail = snd_pcm_capture_avail(runtime);
2350 if (avail <= 0) {
2351 ret = 0;
2352 goto __end;
2353 }
2354 if (frames > (snd_pcm_uframes_t)avail)
2355 frames = avail;
2356 appl_ptr = runtime->control->appl_ptr + frames;
2357 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2358 appl_ptr -= runtime->boundary;
2359 runtime->control->appl_ptr = appl_ptr;
2360 ret = frames;
2361 __end:
2362 snd_pcm_stream_unlock_irq(substream);
2363 return ret;
2364 }
2365
2366 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2367 {
2368 struct snd_pcm_runtime *runtime = substream->runtime;
2369 int err;
2370
2371 snd_pcm_stream_lock_irq(substream);
2372 switch (runtime->status->state) {
2373 case SNDRV_PCM_STATE_DRAINING:
2374 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2375 goto __badfd;
2376 case SNDRV_PCM_STATE_RUNNING:
2377 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2378 break;
2379 /* Fall through */
2380 case SNDRV_PCM_STATE_PREPARED:
2381 case SNDRV_PCM_STATE_SUSPENDED:
2382 err = 0;
2383 break;
2384 case SNDRV_PCM_STATE_XRUN:
2385 err = -EPIPE;
2386 break;
2387 default:
2388 __badfd:
2389 err = -EBADFD;
2390 break;
2391 }
2392 snd_pcm_stream_unlock_irq(substream);
2393 return err;
2394 }
2395
2396 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2397 snd_pcm_sframes_t __user *res)
2398 {
2399 struct snd_pcm_runtime *runtime = substream->runtime;
2400 int err;
2401 snd_pcm_sframes_t n = 0;
2402
2403 snd_pcm_stream_lock_irq(substream);
2404 switch (runtime->status->state) {
2405 case SNDRV_PCM_STATE_DRAINING:
2406 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2407 goto __badfd;
2408 case SNDRV_PCM_STATE_RUNNING:
2409 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2410 break;
2411 /* Fall through */
2412 case SNDRV_PCM_STATE_PREPARED:
2413 case SNDRV_PCM_STATE_SUSPENDED:
2414 err = 0;
2415 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2416 n = snd_pcm_playback_hw_avail(runtime);
2417 else
2418 n = snd_pcm_capture_avail(runtime);
2419 break;
2420 case SNDRV_PCM_STATE_XRUN:
2421 err = -EPIPE;
2422 break;
2423 default:
2424 __badfd:
2425 err = -EBADFD;
2426 break;
2427 }
2428 snd_pcm_stream_unlock_irq(substream);
2429 if (!err)
2430 if (put_user(n, res))
2431 err = -EFAULT;
2432 return err;
2433 }
2434
2435 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2436 struct snd_pcm_sync_ptr __user *_sync_ptr)
2437 {
2438 struct snd_pcm_runtime *runtime = substream->runtime;
2439 struct snd_pcm_sync_ptr sync_ptr;
2440 volatile struct snd_pcm_mmap_status *status;
2441 volatile struct snd_pcm_mmap_control *control;
2442 int err;
2443
2444 memset(&sync_ptr, 0, sizeof(sync_ptr));
2445 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2446 return -EFAULT;
2447 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2448 return -EFAULT;
2449 status = runtime->status;
2450 control = runtime->control;
2451 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2452 err = snd_pcm_hwsync(substream);
2453 if (err < 0)
2454 return err;
2455 }
2456 snd_pcm_stream_lock_irq(substream);
2457 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2458 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2459 else
2460 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2461 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2462 control->avail_min = sync_ptr.c.control.avail_min;
2463 else
2464 sync_ptr.c.control.avail_min = control->avail_min;
2465 sync_ptr.s.status.state = status->state;
2466 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2467 sync_ptr.s.status.tstamp = status->tstamp;
2468 sync_ptr.s.status.suspended_state = status->suspended_state;
2469 snd_pcm_stream_unlock_irq(substream);
2470 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2471 return -EFAULT;
2472 return 0;
2473 }
2474
2475 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2476 {
2477 struct snd_pcm_runtime *runtime = substream->runtime;
2478 int arg;
2479
2480 if (get_user(arg, _arg))
2481 return -EFAULT;
2482 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2483 return -EINVAL;
2484 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2485 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2486 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2487 return 0;
2488 }
2489
2490 static int snd_pcm_common_ioctl1(struct file *file,
2491 struct snd_pcm_substream *substream,
2492 unsigned int cmd, void __user *arg)
2493 {
2494 snd_assert(substream != NULL, return -ENXIO);
2495
2496 switch (cmd) {
2497 case SNDRV_PCM_IOCTL_PVERSION:
2498 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2499 case SNDRV_PCM_IOCTL_INFO:
2500 return snd_pcm_info_user(substream, arg);
2501 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2502 return 0;
2503 case SNDRV_PCM_IOCTL_TTSTAMP:
2504 return snd_pcm_tstamp(substream, arg);
2505 case SNDRV_PCM_IOCTL_HW_REFINE:
2506 return snd_pcm_hw_refine_user(substream, arg);
2507 case SNDRV_PCM_IOCTL_HW_PARAMS:
2508 return snd_pcm_hw_params_user(substream, arg);
2509 case SNDRV_PCM_IOCTL_HW_FREE:
2510 return snd_pcm_hw_free(substream);
2511 case SNDRV_PCM_IOCTL_SW_PARAMS:
2512 return snd_pcm_sw_params_user(substream, arg);
2513 case SNDRV_PCM_IOCTL_STATUS:
2514 return snd_pcm_status_user(substream, arg);
2515 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2516 return snd_pcm_channel_info_user(substream, arg);
2517 case SNDRV_PCM_IOCTL_PREPARE:
2518 return snd_pcm_prepare(substream, file);
2519 case SNDRV_PCM_IOCTL_RESET:
2520 return snd_pcm_reset(substream);
2521 case SNDRV_PCM_IOCTL_START:
2522 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2523 case SNDRV_PCM_IOCTL_LINK:
2524 return snd_pcm_link(substream, (int)(unsigned long) arg);
2525 case SNDRV_PCM_IOCTL_UNLINK:
2526 return snd_pcm_unlink(substream);
2527 case SNDRV_PCM_IOCTL_RESUME:
2528 return snd_pcm_resume(substream);
2529 case SNDRV_PCM_IOCTL_XRUN:
2530 return snd_pcm_xrun(substream);
2531 case SNDRV_PCM_IOCTL_HWSYNC:
2532 return snd_pcm_hwsync(substream);
2533 case SNDRV_PCM_IOCTL_DELAY:
2534 return snd_pcm_delay(substream, arg);
2535 case SNDRV_PCM_IOCTL_SYNC_PTR:
2536 return snd_pcm_sync_ptr(substream, arg);
2537 #ifdef CONFIG_SND_SUPPORT_OLD_API
2538 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2539 return snd_pcm_hw_refine_old_user(substream, arg);
2540 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2541 return snd_pcm_hw_params_old_user(substream, arg);
2542 #endif
2543 case SNDRV_PCM_IOCTL_DRAIN:
2544 return snd_pcm_drain(substream);
2545 case SNDRV_PCM_IOCTL_DROP:
2546 return snd_pcm_drop(substream);
2547 case SNDRV_PCM_IOCTL_PAUSE:
2548 {
2549 int res;
2550 snd_pcm_stream_lock_irq(substream);
2551 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2552 snd_pcm_stream_unlock_irq(substream);
2553 return res;
2554 }
2555 }
2556 snd_printd("unknown ioctl = 0x%x\n", cmd);
2557 return -ENOTTY;
2558 }
2559
2560 static int snd_pcm_playback_ioctl1(struct file *file,
2561 struct snd_pcm_substream *substream,
2562 unsigned int cmd, void __user *arg)
2563 {
2564 snd_assert(substream != NULL, return -ENXIO);
2565 snd_assert(substream->stream == SNDRV_PCM_STREAM_PLAYBACK, return -EINVAL);
2566 switch (cmd) {
2567 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2568 {
2569 struct snd_xferi xferi;
2570 struct snd_xferi __user *_xferi = arg;
2571 struct snd_pcm_runtime *runtime = substream->runtime;
2572 snd_pcm_sframes_t result;
2573 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2574 return -EBADFD;
2575 if (put_user(0, &_xferi->result))
2576 return -EFAULT;
2577 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2578 return -EFAULT;
2579 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2580 __put_user(result, &_xferi->result);
2581 return result < 0 ? result : 0;
2582 }
2583 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2584 {
2585 struct snd_xfern xfern;
2586 struct snd_xfern __user *_xfern = arg;
2587 struct snd_pcm_runtime *runtime = substream->runtime;
2588 void __user **bufs;
2589 snd_pcm_sframes_t result;
2590 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2591 return -EBADFD;
2592 if (runtime->channels > 128)
2593 return -EINVAL;
2594 if (put_user(0, &_xfern->result))
2595 return -EFAULT;
2596 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2597 return -EFAULT;
2598 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
2599 if (bufs == NULL)
2600 return -ENOMEM;
2601 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
2602 kfree(bufs);
2603 return -EFAULT;
2604 }
2605 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2606 kfree(bufs);
2607 __put_user(result, &_xfern->result);
2608 return result < 0 ? result : 0;
2609 }
2610 case SNDRV_PCM_IOCTL_REWIND:
2611 {
2612 snd_pcm_uframes_t frames;
2613 snd_pcm_uframes_t __user *_frames = arg;
2614 snd_pcm_sframes_t result;
2615 if (get_user(frames, _frames))
2616 return -EFAULT;
2617 if (put_user(0, _frames))
2618 return -EFAULT;
2619 result = snd_pcm_playback_rewind(substream, frames);
2620 __put_user(result, _frames);
2621 return result < 0 ? result : 0;
2622 }
2623 case SNDRV_PCM_IOCTL_FORWARD:
2624 {
2625 snd_pcm_uframes_t frames;
2626 snd_pcm_uframes_t __user *_frames = arg;
2627 snd_pcm_sframes_t result;
2628 if (get_user(frames, _frames))
2629 return -EFAULT;
2630 if (put_user(0, _frames))
2631 return -EFAULT;
2632 result = snd_pcm_playback_forward(substream, frames);
2633 __put_user(result, _frames);
2634 return result < 0 ? result : 0;
2635 }
2636 }
2637 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2638 }
2639
2640 static int snd_pcm_capture_ioctl1(struct file *file,
2641 struct snd_pcm_substream *substream,
2642 unsigned int cmd, void __user *arg)
2643 {
2644 snd_assert(substream != NULL, return -ENXIO);
2645 snd_assert(substream->stream == SNDRV_PCM_STREAM_CAPTURE, return -EINVAL);
2646 switch (cmd) {
2647 case SNDRV_PCM_IOCTL_READI_FRAMES:
2648 {
2649 struct snd_xferi xferi;
2650 struct snd_xferi __user *_xferi = arg;
2651 struct snd_pcm_runtime *runtime = substream->runtime;
2652 snd_pcm_sframes_t result;
2653 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2654 return -EBADFD;
2655 if (put_user(0, &_xferi->result))
2656 return -EFAULT;
2657 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2658 return -EFAULT;
2659 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2660 __put_user(result, &_xferi->result);
2661 return result < 0 ? result : 0;
2662 }
2663 case SNDRV_PCM_IOCTL_READN_FRAMES:
2664 {
2665 struct snd_xfern xfern;
2666 struct snd_xfern __user *_xfern = arg;
2667 struct snd_pcm_runtime *runtime = substream->runtime;
2668 void *bufs;
2669 snd_pcm_sframes_t result;
2670 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2671 return -EBADFD;
2672 if (runtime->channels > 128)
2673 return -EINVAL;
2674 if (put_user(0, &_xfern->result))
2675 return -EFAULT;
2676 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2677 return -EFAULT;
2678 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
2679 if (bufs == NULL)
2680 return -ENOMEM;
2681 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
2682 kfree(bufs);
2683 return -EFAULT;
2684 }
2685 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2686 kfree(bufs);
2687 __put_user(result, &_xfern->result);
2688 return result < 0 ? result : 0;
2689 }
2690 case SNDRV_PCM_IOCTL_REWIND:
2691 {
2692 snd_pcm_uframes_t frames;
2693 snd_pcm_uframes_t __user *_frames = arg;
2694 snd_pcm_sframes_t result;
2695 if (get_user(frames, _frames))
2696 return -EFAULT;
2697 if (put_user(0, _frames))
2698 return -EFAULT;
2699 result = snd_pcm_capture_rewind(substream, frames);
2700 __put_user(result, _frames);
2701 return result < 0 ? result : 0;
2702 }
2703 case SNDRV_PCM_IOCTL_FORWARD:
2704 {
2705 snd_pcm_uframes_t frames;
2706 snd_pcm_uframes_t __user *_frames = arg;
2707 snd_pcm_sframes_t result;
2708 if (get_user(frames, _frames))
2709 return -EFAULT;
2710 if (put_user(0, _frames))
2711 return -EFAULT;
2712 result = snd_pcm_capture_forward(substream, frames);
2713 __put_user(result, _frames);
2714 return result < 0 ? result : 0;
2715 }
2716 }
2717 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2718 }
2719
2720 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2721 unsigned long arg)
2722 {
2723 struct snd_pcm_file *pcm_file;
2724
2725 pcm_file = file->private_data;
2726
2727 if (((cmd >> 8) & 0xff) != 'A')
2728 return -ENOTTY;
2729
2730 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2731 (void __user *)arg);
2732 }
2733
2734 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2735 unsigned long arg)
2736 {
2737 struct snd_pcm_file *pcm_file;
2738
2739 pcm_file = file->private_data;
2740
2741 if (((cmd >> 8) & 0xff) != 'A')
2742 return -ENOTTY;
2743
2744 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2745 (void __user *)arg);
2746 }
2747
2748 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2749 unsigned int cmd, void *arg)
2750 {
2751 mm_segment_t fs;
2752 int result;
2753
2754 fs = snd_enter_user();
2755 switch (substream->stream) {
2756 case SNDRV_PCM_STREAM_PLAYBACK:
2757 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2758 (void __user *)arg);
2759 break;
2760 case SNDRV_PCM_STREAM_CAPTURE:
2761 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2762 (void __user *)arg);
2763 break;
2764 default:
2765 result = -EINVAL;
2766 break;
2767 }
2768 snd_leave_user(fs);
2769 return result;
2770 }
2771
2772 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2773
2774 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2775 loff_t * offset)
2776 {
2777 struct snd_pcm_file *pcm_file;
2778 struct snd_pcm_substream *substream;
2779 struct snd_pcm_runtime *runtime;
2780 snd_pcm_sframes_t result;
2781
2782 pcm_file = file->private_data;
2783 substream = pcm_file->substream;
2784 snd_assert(substream != NULL, return -ENXIO);
2785 runtime = substream->runtime;
2786 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2787 return -EBADFD;
2788 if (!frame_aligned(runtime, count))
2789 return -EINVAL;
2790 count = bytes_to_frames(runtime, count);
2791 result = snd_pcm_lib_read(substream, buf, count);
2792 if (result > 0)
2793 result = frames_to_bytes(runtime, result);
2794 return result;
2795 }
2796
2797 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2798 size_t count, loff_t * offset)
2799 {
2800 struct snd_pcm_file *pcm_file;
2801 struct snd_pcm_substream *substream;
2802 struct snd_pcm_runtime *runtime;
2803 snd_pcm_sframes_t result;
2804
2805 pcm_file = file->private_data;
2806 substream = pcm_file->substream;
2807 snd_assert(substream != NULL, result = -ENXIO; goto end);
2808 runtime = substream->runtime;
2809 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
2810 result = -EBADFD;
2811 goto end;
2812 }
2813 if (!frame_aligned(runtime, count)) {
2814 result = -EINVAL;
2815 goto end;
2816 }
2817 count = bytes_to_frames(runtime, count);
2818 result = snd_pcm_lib_write(substream, buf, count);
2819 if (result > 0)
2820 result = frames_to_bytes(runtime, result);
2821 end:
2822 return result;
2823 }
2824
2825 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2826 unsigned long nr_segs, loff_t pos)
2827
2828 {
2829 struct snd_pcm_file *pcm_file;
2830 struct snd_pcm_substream *substream;
2831 struct snd_pcm_runtime *runtime;
2832 snd_pcm_sframes_t result;
2833 unsigned long i;
2834 void __user **bufs;
2835 snd_pcm_uframes_t frames;
2836
2837 pcm_file = iocb->ki_filp->private_data;
2838 substream = pcm_file->substream;
2839 snd_assert(substream != NULL, return -ENXIO);
2840 runtime = substream->runtime;
2841 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2842 return -EBADFD;
2843 if (nr_segs > 1024 || nr_segs != runtime->channels)
2844 return -EINVAL;
2845 if (!frame_aligned(runtime, iov->iov_len))
2846 return -EINVAL;
2847 frames = bytes_to_samples(runtime, iov->iov_len);
2848 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2849 if (bufs == NULL)
2850 return -ENOMEM;
2851 for (i = 0; i < nr_segs; ++i)
2852 bufs[i] = iov[i].iov_base;
2853 result = snd_pcm_lib_readv(substream, bufs, frames);
2854 if (result > 0)
2855 result = frames_to_bytes(runtime, result);
2856 kfree(bufs);
2857 return result;
2858 }
2859
2860 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2861 unsigned long nr_segs, loff_t pos)
2862 {
2863 struct snd_pcm_file *pcm_file;
2864 struct snd_pcm_substream *substream;
2865 struct snd_pcm_runtime *runtime;
2866 snd_pcm_sframes_t result;
2867 unsigned long i;
2868 void __user **bufs;
2869 snd_pcm_uframes_t frames;
2870
2871 pcm_file = iocb->ki_filp->private_data;
2872 substream = pcm_file->substream;
2873 snd_assert(substream != NULL, result = -ENXIO; goto end);
2874 runtime = substream->runtime;
2875 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
2876 result = -EBADFD;
2877 goto end;
2878 }
2879 if (nr_segs > 128 || nr_segs != runtime->channels ||
2880 !frame_aligned(runtime, iov->iov_len)) {
2881 result = -EINVAL;
2882 goto end;
2883 }
2884 frames = bytes_to_samples(runtime, iov->iov_len);
2885 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2886 if (bufs == NULL)
2887 return -ENOMEM;
2888 for (i = 0; i < nr_segs; ++i)
2889 bufs[i] = iov[i].iov_base;
2890 result = snd_pcm_lib_writev(substream, bufs, frames);
2891 if (result > 0)
2892 result = frames_to_bytes(runtime, result);
2893 kfree(bufs);
2894 end:
2895 return result;
2896 }
2897
2898 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2899 {
2900 struct snd_pcm_file *pcm_file;
2901 struct snd_pcm_substream *substream;
2902 struct snd_pcm_runtime *runtime;
2903 unsigned int mask;
2904 snd_pcm_uframes_t avail;
2905
2906 pcm_file = file->private_data;
2907
2908 substream = pcm_file->substream;
2909 snd_assert(substream != NULL, return -ENXIO);
2910 runtime = substream->runtime;
2911
2912 poll_wait(file, &runtime->sleep, wait);
2913
2914 snd_pcm_stream_lock_irq(substream);
2915 avail = snd_pcm_playback_avail(runtime);
2916 switch (runtime->status->state) {
2917 case SNDRV_PCM_STATE_RUNNING:
2918 case SNDRV_PCM_STATE_PREPARED:
2919 case SNDRV_PCM_STATE_PAUSED:
2920 if (avail >= runtime->control->avail_min) {
2921 mask = POLLOUT | POLLWRNORM;
2922 break;
2923 }
2924 /* Fall through */
2925 case SNDRV_PCM_STATE_DRAINING:
2926 mask = 0;
2927 break;
2928 default:
2929 mask = POLLOUT | POLLWRNORM | POLLERR;
2930 break;
2931 }
2932 snd_pcm_stream_unlock_irq(substream);
2933 return mask;
2934 }
2935
2936 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2937 {
2938 struct snd_pcm_file *pcm_file;
2939 struct snd_pcm_substream *substream;
2940 struct snd_pcm_runtime *runtime;
2941 unsigned int mask;
2942 snd_pcm_uframes_t avail;
2943
2944 pcm_file = file->private_data;
2945
2946 substream = pcm_file->substream;
2947 snd_assert(substream != NULL, return -ENXIO);
2948 runtime = substream->runtime;
2949
2950 poll_wait(file, &runtime->sleep, wait);
2951
2952 snd_pcm_stream_lock_irq(substream);
2953 avail = snd_pcm_capture_avail(runtime);
2954 switch (runtime->status->state) {
2955 case SNDRV_PCM_STATE_RUNNING:
2956 case SNDRV_PCM_STATE_PREPARED:
2957 case SNDRV_PCM_STATE_PAUSED:
2958 if (avail >= runtime->control->avail_min) {
2959 mask = POLLIN | POLLRDNORM;
2960 break;
2961 }
2962 mask = 0;
2963 break;
2964 case SNDRV_PCM_STATE_DRAINING:
2965 if (avail > 0) {
2966 mask = POLLIN | POLLRDNORM;
2967 break;
2968 }
2969 /* Fall through */
2970 default:
2971 mask = POLLIN | POLLRDNORM | POLLERR;
2972 break;
2973 }
2974 snd_pcm_stream_unlock_irq(substream);
2975 return mask;
2976 }
2977
2978 /*
2979 * mmap support
2980 */
2981
2982 /*
2983 * Only on coherent architectures, we can mmap the status and the control records
2984 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
2985 */
2986 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
2987 /*
2988 * mmap status record
2989 */
2990 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
2991 struct vm_fault *vmf)
2992 {
2993 struct snd_pcm_substream *substream = area->vm_private_data;
2994 struct snd_pcm_runtime *runtime;
2995
2996 if (substream == NULL)
2997 return VM_FAULT_SIGBUS;
2998 runtime = substream->runtime;
2999 vmf->page = virt_to_page(runtime->status);
3000 get_page(vmf->page);
3001 return 0;
3002 }
3003
3004 static struct vm_operations_struct snd_pcm_vm_ops_status =
3005 {
3006 .fault = snd_pcm_mmap_status_fault,
3007 };
3008
3009 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3010 struct vm_area_struct *area)
3011 {
3012 struct snd_pcm_runtime *runtime;
3013 long size;
3014 if (!(area->vm_flags & VM_READ))
3015 return -EINVAL;
3016 runtime = substream->runtime;
3017 snd_assert(runtime != NULL, return -EAGAIN);
3018 size = area->vm_end - area->vm_start;
3019 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3020 return -EINVAL;
3021 area->vm_ops = &snd_pcm_vm_ops_status;
3022 area->vm_private_data = substream;
3023 area->vm_flags |= VM_RESERVED;
3024 return 0;
3025 }
3026
3027 /*
3028 * mmap control record
3029 */
3030 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3031 struct vm_fault *vmf)
3032 {
3033 struct snd_pcm_substream *substream = area->vm_private_data;
3034 struct snd_pcm_runtime *runtime;
3035
3036 if (substream == NULL)
3037 return VM_FAULT_SIGBUS;
3038 runtime = substream->runtime;
3039 vmf->page = virt_to_page(runtime->control);
3040 get_page(vmf->page);
3041 return 0;
3042 }
3043
3044 static struct vm_operations_struct snd_pcm_vm_ops_control =
3045 {
3046 .fault = snd_pcm_mmap_control_fault,
3047 };
3048
3049 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3050 struct vm_area_struct *area)
3051 {
3052 struct snd_pcm_runtime *runtime;
3053 long size;
3054 if (!(area->vm_flags & VM_READ))
3055 return -EINVAL;
3056 runtime = substream->runtime;
3057 snd_assert(runtime != NULL, return -EAGAIN);
3058 size = area->vm_end - area->vm_start;
3059 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3060 return -EINVAL;
3061 area->vm_ops = &snd_pcm_vm_ops_control;
3062 area->vm_private_data = substream;
3063 area->vm_flags |= VM_RESERVED;
3064 return 0;
3065 }
3066 #else /* ! coherent mmap */
3067 /*
3068 * don't support mmap for status and control records.
3069 */
3070 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3071 struct vm_area_struct *area)
3072 {
3073 return -ENXIO;
3074 }
3075 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3076 struct vm_area_struct *area)
3077 {
3078 return -ENXIO;
3079 }
3080 #endif /* coherent mmap */
3081
3082 /*
3083 * fault callback for mmapping a RAM page
3084 */
3085 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3086 struct vm_fault *vmf)
3087 {
3088 struct snd_pcm_substream *substream = area->vm_private_data;
3089 struct snd_pcm_runtime *runtime;
3090 unsigned long offset;
3091 struct page * page;
3092 void *vaddr;
3093 size_t dma_bytes;
3094
3095 if (substream == NULL)
3096 return VM_FAULT_SIGBUS;
3097 runtime = substream->runtime;
3098 offset = vmf->pgoff << PAGE_SHIFT;
3099 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3100 if (offset > dma_bytes - PAGE_SIZE)
3101 return VM_FAULT_SIGBUS;
3102 if (substream->ops->page) {
3103 page = substream->ops->page(substream, offset);
3104 if (!page)
3105 return VM_FAULT_SIGBUS;
3106 } else {
3107 vaddr = runtime->dma_area + offset;
3108 page = virt_to_page(vaddr);
3109 }
3110 get_page(page);
3111 vmf->page = page;
3112 return 0;
3113 }
3114
3115 static struct vm_operations_struct snd_pcm_vm_ops_data =
3116 {
3117 .open = snd_pcm_mmap_data_open,
3118 .close = snd_pcm_mmap_data_close,
3119 .fault = snd_pcm_mmap_data_fault,
3120 };
3121
3122 /*
3123 * mmap the DMA buffer on RAM
3124 */
3125 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3126 struct vm_area_struct *area)
3127 {
3128 area->vm_ops = &snd_pcm_vm_ops_data;
3129 area->vm_private_data = substream;
3130 area->vm_flags |= VM_RESERVED;
3131 atomic_inc(&substream->mmap_count);
3132 return 0;
3133 }
3134
3135 /*
3136 * mmap the DMA buffer on I/O memory area
3137 */
3138 #if SNDRV_PCM_INFO_MMAP_IOMEM
3139 static struct vm_operations_struct snd_pcm_vm_ops_data_mmio =
3140 {
3141 .open = snd_pcm_mmap_data_open,
3142 .close = snd_pcm_mmap_data_close,
3143 };
3144
3145 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3146 struct vm_area_struct *area)
3147 {
3148 long size;
3149 unsigned long offset;
3150
3151 #ifdef pgprot_noncached
3152 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3153 #endif
3154 area->vm_ops = &snd_pcm_vm_ops_data_mmio;
3155 area->vm_private_data = substream;
3156 area->vm_flags |= VM_IO;
3157 size = area->vm_end - area->vm_start;
3158 offset = area->vm_pgoff << PAGE_SHIFT;
3159 if (io_remap_pfn_range(area, area->vm_start,
3160 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3161 size, area->vm_page_prot))
3162 return -EAGAIN;
3163 atomic_inc(&substream->mmap_count);
3164 return 0;
3165 }
3166
3167 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3168 #endif /* SNDRV_PCM_INFO_MMAP */
3169
3170 /*
3171 * mmap DMA buffer
3172 */
3173 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3174 struct vm_area_struct *area)
3175 {
3176 struct snd_pcm_runtime *runtime;
3177 long size;
3178 unsigned long offset;
3179 size_t dma_bytes;
3180
3181 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3182 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3183 return -EINVAL;
3184 } else {
3185 if (!(area->vm_flags & VM_READ))
3186 return -EINVAL;
3187 }
3188 runtime = substream->runtime;
3189 snd_assert(runtime != NULL, return -EAGAIN);
3190 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3191 return -EBADFD;
3192 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3193 return -ENXIO;
3194 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3195 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3196 return -EINVAL;
3197 size = area->vm_end - area->vm_start;
3198 offset = area->vm_pgoff << PAGE_SHIFT;
3199 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3200 if ((size_t)size > dma_bytes)
3201 return -EINVAL;
3202 if (offset > dma_bytes - size)
3203 return -EINVAL;
3204
3205 if (substream->ops->mmap)
3206 return substream->ops->mmap(substream, area);
3207 else
3208 return snd_pcm_default_mmap(substream, area);
3209 }
3210
3211 EXPORT_SYMBOL(snd_pcm_mmap_data);
3212
3213 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3214 {
3215 struct snd_pcm_file * pcm_file;
3216 struct snd_pcm_substream *substream;
3217 unsigned long offset;
3218
3219 pcm_file = file->private_data;
3220 substream = pcm_file->substream;
3221 snd_assert(substream != NULL, return -ENXIO);
3222
3223 offset = area->vm_pgoff << PAGE_SHIFT;
3224 switch (offset) {
3225 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3226 if (pcm_file->no_compat_mmap)
3227 return -ENXIO;
3228 return snd_pcm_mmap_status(substream, file, area);
3229 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3230 if (pcm_file->no_compat_mmap)
3231 return -ENXIO;
3232 return snd_pcm_mmap_control(substream, file, area);
3233 default:
3234 return snd_pcm_mmap_data(substream, file, area);
3235 }
3236 return 0;
3237 }
3238
3239 static int snd_pcm_fasync(int fd, struct file * file, int on)
3240 {
3241 struct snd_pcm_file * pcm_file;
3242 struct snd_pcm_substream *substream;
3243 struct snd_pcm_runtime *runtime;
3244 int err;
3245
3246 pcm_file = file->private_data;
3247 substream = pcm_file->substream;
3248 snd_assert(substream != NULL, return -ENXIO);
3249 runtime = substream->runtime;
3250
3251 err = fasync_helper(fd, file, on, &runtime->fasync);
3252 if (err < 0)
3253 return err;
3254 return 0;
3255 }
3256
3257 /*
3258 * ioctl32 compat
3259 */
3260 #ifdef CONFIG_COMPAT
3261 #include "pcm_compat.c"
3262 #else
3263 #define snd_pcm_ioctl_compat NULL
3264 #endif
3265
3266 /*
3267 * To be removed helpers to keep binary compatibility
3268 */
3269
3270 #ifdef CONFIG_SND_SUPPORT_OLD_API
3271 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3272 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3273
3274 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3275 struct snd_pcm_hw_params_old *oparams)
3276 {
3277 unsigned int i;
3278
3279 memset(params, 0, sizeof(*params));
3280 params->flags = oparams->flags;
3281 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3282 params->masks[i].bits[0] = oparams->masks[i];
3283 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3284 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3285 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3286 params->info = oparams->info;
3287 params->msbits = oparams->msbits;
3288 params->rate_num = oparams->rate_num;
3289 params->rate_den = oparams->rate_den;
3290 params->fifo_size = oparams->fifo_size;
3291 }
3292
3293 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3294 struct snd_pcm_hw_params *params)
3295 {
3296 unsigned int i;
3297
3298 memset(oparams, 0, sizeof(*oparams));
3299 oparams->flags = params->flags;
3300 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3301 oparams->masks[i] = params->masks[i].bits[0];
3302 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3303 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3304 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3305 oparams->info = params->info;
3306 oparams->msbits = params->msbits;
3307 oparams->rate_num = params->rate_num;
3308 oparams->rate_den = params->rate_den;
3309 oparams->fifo_size = params->fifo_size;
3310 }
3311
3312 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3313 struct snd_pcm_hw_params_old __user * _oparams)
3314 {
3315 struct snd_pcm_hw_params *params;
3316 struct snd_pcm_hw_params_old *oparams = NULL;
3317 int err;
3318
3319 params = kmalloc(sizeof(*params), GFP_KERNEL);
3320 if (!params) {
3321 err = -ENOMEM;
3322 goto out;
3323 }
3324 oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
3325 if (!oparams) {
3326 err = -ENOMEM;
3327 goto out;
3328 }
3329
3330 if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
3331 err = -EFAULT;
3332 goto out;
3333 }
3334 snd_pcm_hw_convert_from_old_params(params, oparams);
3335 err = snd_pcm_hw_refine(substream, params);
3336 snd_pcm_hw_convert_to_old_params(oparams, params);
3337 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3338 if (!err)
3339 err = -EFAULT;
3340 }
3341 out:
3342 kfree(params);
3343 kfree(oparams);
3344 return err;
3345 }
3346
3347 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3348 struct snd_pcm_hw_params_old __user * _oparams)
3349 {
3350 struct snd_pcm_hw_params *params;
3351 struct snd_pcm_hw_params_old *oparams = NULL;
3352 int err;
3353
3354 params = kmalloc(sizeof(*params), GFP_KERNEL);
3355 if (!params) {
3356 err = -ENOMEM;
3357 goto out;
3358 }
3359 oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
3360 if (!oparams) {
3361 err = -ENOMEM;
3362 goto out;
3363 }
3364 if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
3365 err = -EFAULT;
3366 goto out;
3367 }
3368 snd_pcm_hw_convert_from_old_params(params, oparams);
3369 err = snd_pcm_hw_params(substream, params);
3370 snd_pcm_hw_convert_to_old_params(oparams, params);
3371 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3372 if (!err)
3373 err = -EFAULT;
3374 }
3375 out:
3376 kfree(params);
3377 kfree(oparams);
3378 return err;
3379 }
3380 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3381
3382 /*
3383 * Register section
3384 */
3385
3386 const struct file_operations snd_pcm_f_ops[2] = {
3387 {
3388 .owner = THIS_MODULE,
3389 .write = snd_pcm_write,
3390 .aio_write = snd_pcm_aio_write,
3391 .open = snd_pcm_playback_open,
3392 .release = snd_pcm_release,
3393 .poll = snd_pcm_playback_poll,
3394 .unlocked_ioctl = snd_pcm_playback_ioctl,
3395 .compat_ioctl = snd_pcm_ioctl_compat,
3396 .mmap = snd_pcm_mmap,
3397 .fasync = snd_pcm_fasync,
3398 },
3399 {
3400 .owner = THIS_MODULE,
3401 .read = snd_pcm_read,
3402 .aio_read = snd_pcm_aio_read,
3403 .open = snd_pcm_capture_open,
3404 .release = snd_pcm_release,
3405 .poll = snd_pcm_capture_poll,
3406 .unlocked_ioctl = snd_pcm_capture_ioctl,
3407 .compat_ioctl = snd_pcm_ioctl_compat,
3408 .mmap = snd_pcm_mmap,
3409 .fasync = snd_pcm_fasync,
3410 }
3411 };
Linux kernel - Deliverables
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