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Merge tag 'devicetree-for-linus' of git://git.secretlab.ca/git/linux
[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 <linux/mm.h>
23 #include <linux/module.h>
24 #include <linux/file.h>
25 #include <linux/slab.h>
26 #include <linux/time.h>
27 #include <linux/pm_qos.h>
28 #include <linux/aio.h>
29 #include <linux/dma-mapping.h>
30 #include <sound/core.h>
31 #include <sound/control.h>
32 #include <sound/info.h>
33 #include <sound/pcm.h>
34 #include <sound/pcm_params.h>
35 #include <sound/timer.h>
36 #include <sound/minors.h>
37 #include <asm/io.h>
38 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
39 #include <dma-coherence.h>
40 #endif
41
42 /*
43 * Compatibility
44 */
45
46 struct snd_pcm_hw_params_old {
47 unsigned int flags;
48 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
49 SNDRV_PCM_HW_PARAM_ACCESS + 1];
50 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
51 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
52 unsigned int rmask;
53 unsigned int cmask;
54 unsigned int info;
55 unsigned int msbits;
56 unsigned int rate_num;
57 unsigned int rate_den;
58 snd_pcm_uframes_t fifo_size;
59 unsigned char reserved[64];
60 };
61
62 #ifdef CONFIG_SND_SUPPORT_OLD_API
63 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
64 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
65
66 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
67 struct snd_pcm_hw_params_old __user * _oparams);
68 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
69 struct snd_pcm_hw_params_old __user * _oparams);
70 #endif
71 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
72
73 /*
74 *
75 */
76
77 DEFINE_RWLOCK(snd_pcm_link_rwlock);
78 EXPORT_SYMBOL(snd_pcm_link_rwlock);
79
80 static DECLARE_RWSEM(snd_pcm_link_rwsem);
81
82 static inline mm_segment_t snd_enter_user(void)
83 {
84 mm_segment_t fs = get_fs();
85 set_fs(get_ds());
86 return fs;
87 }
88
89 static inline void snd_leave_user(mm_segment_t fs)
90 {
91 set_fs(fs);
92 }
93
94
95
96 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
97 {
98 struct snd_pcm_runtime *runtime;
99 struct snd_pcm *pcm = substream->pcm;
100 struct snd_pcm_str *pstr = substream->pstr;
101
102 memset(info, 0, sizeof(*info));
103 info->card = pcm->card->number;
104 info->device = pcm->device;
105 info->stream = substream->stream;
106 info->subdevice = substream->number;
107 strlcpy(info->id, pcm->id, sizeof(info->id));
108 strlcpy(info->name, pcm->name, sizeof(info->name));
109 info->dev_class = pcm->dev_class;
110 info->dev_subclass = pcm->dev_subclass;
111 info->subdevices_count = pstr->substream_count;
112 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
113 strlcpy(info->subname, substream->name, sizeof(info->subname));
114 runtime = substream->runtime;
115 /* AB: FIXME!!! This is definitely nonsense */
116 if (runtime) {
117 info->sync = runtime->sync;
118 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
119 }
120 return 0;
121 }
122
123 int snd_pcm_info_user(struct snd_pcm_substream *substream,
124 struct snd_pcm_info __user * _info)
125 {
126 struct snd_pcm_info *info;
127 int err;
128
129 info = kmalloc(sizeof(*info), GFP_KERNEL);
130 if (! info)
131 return -ENOMEM;
132 err = snd_pcm_info(substream, info);
133 if (err >= 0) {
134 if (copy_to_user(_info, info, sizeof(*info)))
135 err = -EFAULT;
136 }
137 kfree(info);
138 return err;
139 }
140
141 #undef RULES_DEBUG
142
143 #ifdef RULES_DEBUG
144 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
145 static const char * const snd_pcm_hw_param_names[] = {
146 HW_PARAM(ACCESS),
147 HW_PARAM(FORMAT),
148 HW_PARAM(SUBFORMAT),
149 HW_PARAM(SAMPLE_BITS),
150 HW_PARAM(FRAME_BITS),
151 HW_PARAM(CHANNELS),
152 HW_PARAM(RATE),
153 HW_PARAM(PERIOD_TIME),
154 HW_PARAM(PERIOD_SIZE),
155 HW_PARAM(PERIOD_BYTES),
156 HW_PARAM(PERIODS),
157 HW_PARAM(BUFFER_TIME),
158 HW_PARAM(BUFFER_SIZE),
159 HW_PARAM(BUFFER_BYTES),
160 HW_PARAM(TICK_TIME),
161 };
162 #endif
163
164 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
165 struct snd_pcm_hw_params *params)
166 {
167 unsigned int k;
168 struct snd_pcm_hardware *hw;
169 struct snd_interval *i = NULL;
170 struct snd_mask *m = NULL;
171 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
172 unsigned int rstamps[constrs->rules_num];
173 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
174 unsigned int stamp = 2;
175 int changed, again;
176
177 params->info = 0;
178 params->fifo_size = 0;
179 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
180 params->msbits = 0;
181 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
182 params->rate_num = 0;
183 params->rate_den = 0;
184 }
185
186 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
187 m = hw_param_mask(params, k);
188 if (snd_mask_empty(m))
189 return -EINVAL;
190 if (!(params->rmask & (1 << k)))
191 continue;
192 #ifdef RULES_DEBUG
193 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
194 pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
195 #endif
196 changed = snd_mask_refine(m, constrs_mask(constrs, k));
197 #ifdef RULES_DEBUG
198 pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
199 #endif
200 if (changed)
201 params->cmask |= 1 << k;
202 if (changed < 0)
203 return changed;
204 }
205
206 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
207 i = hw_param_interval(params, k);
208 if (snd_interval_empty(i))
209 return -EINVAL;
210 if (!(params->rmask & (1 << k)))
211 continue;
212 #ifdef RULES_DEBUG
213 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
214 if (i->empty)
215 pr_cont("empty");
216 else
217 pr_cont("%c%u %u%c",
218 i->openmin ? '(' : '[', i->min,
219 i->max, i->openmax ? ')' : ']');
220 pr_cont(" -> ");
221 #endif
222 changed = snd_interval_refine(i, constrs_interval(constrs, k));
223 #ifdef RULES_DEBUG
224 if (i->empty)
225 pr_cont("empty\n");
226 else
227 pr_cont("%c%u %u%c\n",
228 i->openmin ? '(' : '[', i->min,
229 i->max, i->openmax ? ')' : ']');
230 #endif
231 if (changed)
232 params->cmask |= 1 << k;
233 if (changed < 0)
234 return changed;
235 }
236
237 for (k = 0; k < constrs->rules_num; k++)
238 rstamps[k] = 0;
239 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
240 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
241 do {
242 again = 0;
243 for (k = 0; k < constrs->rules_num; k++) {
244 struct snd_pcm_hw_rule *r = &constrs->rules[k];
245 unsigned int d;
246 int doit = 0;
247 if (r->cond && !(r->cond & params->flags))
248 continue;
249 for (d = 0; r->deps[d] >= 0; d++) {
250 if (vstamps[r->deps[d]] > rstamps[k]) {
251 doit = 1;
252 break;
253 }
254 }
255 if (!doit)
256 continue;
257 #ifdef RULES_DEBUG
258 pr_debug("Rule %d [%p]: ", k, r->func);
259 if (r->var >= 0) {
260 pr_cont("%s = ", snd_pcm_hw_param_names[r->var]);
261 if (hw_is_mask(r->var)) {
262 m = hw_param_mask(params, r->var);
263 pr_cont("%x", *m->bits);
264 } else {
265 i = hw_param_interval(params, r->var);
266 if (i->empty)
267 pr_cont("empty");
268 else
269 pr_cont("%c%u %u%c",
270 i->openmin ? '(' : '[', i->min,
271 i->max, i->openmax ? ')' : ']');
272 }
273 }
274 #endif
275 changed = r->func(params, r);
276 #ifdef RULES_DEBUG
277 if (r->var >= 0) {
278 pr_cont(" -> ");
279 if (hw_is_mask(r->var))
280 pr_cont("%x", *m->bits);
281 else {
282 if (i->empty)
283 pr_cont("empty");
284 else
285 pr_cont("%c%u %u%c",
286 i->openmin ? '(' : '[', i->min,
287 i->max, i->openmax ? ')' : ']');
288 }
289 }
290 pr_cont("\n");
291 #endif
292 rstamps[k] = stamp;
293 if (changed && r->var >= 0) {
294 params->cmask |= (1 << r->var);
295 vstamps[r->var] = stamp;
296 again = 1;
297 }
298 if (changed < 0)
299 return changed;
300 stamp++;
301 }
302 } while (again);
303 if (!params->msbits) {
304 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
305 if (snd_interval_single(i))
306 params->msbits = snd_interval_value(i);
307 }
308
309 if (!params->rate_den) {
310 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
311 if (snd_interval_single(i)) {
312 params->rate_num = snd_interval_value(i);
313 params->rate_den = 1;
314 }
315 }
316
317 hw = &substream->runtime->hw;
318 if (!params->info)
319 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
320 if (!params->fifo_size) {
321 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
322 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
323 if (snd_mask_min(m) == snd_mask_max(m) &&
324 snd_interval_min(i) == snd_interval_max(i)) {
325 changed = substream->ops->ioctl(substream,
326 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
327 if (changed < 0)
328 return changed;
329 }
330 }
331 params->rmask = 0;
332 return 0;
333 }
334
335 EXPORT_SYMBOL(snd_pcm_hw_refine);
336
337 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
338 struct snd_pcm_hw_params __user * _params)
339 {
340 struct snd_pcm_hw_params *params;
341 int err;
342
343 params = memdup_user(_params, sizeof(*params));
344 if (IS_ERR(params))
345 return PTR_ERR(params);
346
347 err = snd_pcm_hw_refine(substream, params);
348 if (copy_to_user(_params, params, sizeof(*params))) {
349 if (!err)
350 err = -EFAULT;
351 }
352
353 kfree(params);
354 return err;
355 }
356
357 static int period_to_usecs(struct snd_pcm_runtime *runtime)
358 {
359 int usecs;
360
361 if (! runtime->rate)
362 return -1; /* invalid */
363
364 /* take 75% of period time as the deadline */
365 usecs = (750000 / runtime->rate) * runtime->period_size;
366 usecs += ((750000 % runtime->rate) * runtime->period_size) /
367 runtime->rate;
368
369 return usecs;
370 }
371
372 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
373 {
374 snd_pcm_stream_lock_irq(substream);
375 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
376 substream->runtime->status->state = state;
377 snd_pcm_stream_unlock_irq(substream);
378 }
379
380 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
381 struct snd_pcm_hw_params *params)
382 {
383 struct snd_pcm_runtime *runtime;
384 int err, usecs;
385 unsigned int bits;
386 snd_pcm_uframes_t frames;
387
388 if (PCM_RUNTIME_CHECK(substream))
389 return -ENXIO;
390 runtime = substream->runtime;
391 snd_pcm_stream_lock_irq(substream);
392 switch (runtime->status->state) {
393 case SNDRV_PCM_STATE_OPEN:
394 case SNDRV_PCM_STATE_SETUP:
395 case SNDRV_PCM_STATE_PREPARED:
396 break;
397 default:
398 snd_pcm_stream_unlock_irq(substream);
399 return -EBADFD;
400 }
401 snd_pcm_stream_unlock_irq(substream);
402 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
403 if (!substream->oss.oss)
404 #endif
405 if (atomic_read(&substream->mmap_count))
406 return -EBADFD;
407
408 params->rmask = ~0U;
409 err = snd_pcm_hw_refine(substream, params);
410 if (err < 0)
411 goto _error;
412
413 err = snd_pcm_hw_params_choose(substream, params);
414 if (err < 0)
415 goto _error;
416
417 if (substream->ops->hw_params != NULL) {
418 err = substream->ops->hw_params(substream, params);
419 if (err < 0)
420 goto _error;
421 }
422
423 runtime->access = params_access(params);
424 runtime->format = params_format(params);
425 runtime->subformat = params_subformat(params);
426 runtime->channels = params_channels(params);
427 runtime->rate = params_rate(params);
428 runtime->period_size = params_period_size(params);
429 runtime->periods = params_periods(params);
430 runtime->buffer_size = params_buffer_size(params);
431 runtime->info = params->info;
432 runtime->rate_num = params->rate_num;
433 runtime->rate_den = params->rate_den;
434 runtime->no_period_wakeup =
435 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
436 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
437
438 bits = snd_pcm_format_physical_width(runtime->format);
439 runtime->sample_bits = bits;
440 bits *= runtime->channels;
441 runtime->frame_bits = bits;
442 frames = 1;
443 while (bits % 8 != 0) {
444 bits *= 2;
445 frames *= 2;
446 }
447 runtime->byte_align = bits / 8;
448 runtime->min_align = frames;
449
450 /* Default sw params */
451 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
452 runtime->period_step = 1;
453 runtime->control->avail_min = runtime->period_size;
454 runtime->start_threshold = 1;
455 runtime->stop_threshold = runtime->buffer_size;
456 runtime->silence_threshold = 0;
457 runtime->silence_size = 0;
458 runtime->boundary = runtime->buffer_size;
459 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
460 runtime->boundary *= 2;
461
462 snd_pcm_timer_resolution_change(substream);
463 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
464
465 if (pm_qos_request_active(&substream->latency_pm_qos_req))
466 pm_qos_remove_request(&substream->latency_pm_qos_req);
467 if ((usecs = period_to_usecs(runtime)) >= 0)
468 pm_qos_add_request(&substream->latency_pm_qos_req,
469 PM_QOS_CPU_DMA_LATENCY, usecs);
470 return 0;
471 _error:
472 /* hardware might be unusable from this time,
473 so we force application to retry to set
474 the correct hardware parameter settings */
475 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
476 if (substream->ops->hw_free != NULL)
477 substream->ops->hw_free(substream);
478 return err;
479 }
480
481 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
482 struct snd_pcm_hw_params __user * _params)
483 {
484 struct snd_pcm_hw_params *params;
485 int err;
486
487 params = memdup_user(_params, sizeof(*params));
488 if (IS_ERR(params))
489 return PTR_ERR(params);
490
491 err = snd_pcm_hw_params(substream, params);
492 if (copy_to_user(_params, params, sizeof(*params))) {
493 if (!err)
494 err = -EFAULT;
495 }
496
497 kfree(params);
498 return err;
499 }
500
501 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
502 {
503 struct snd_pcm_runtime *runtime;
504 int result = 0;
505
506 if (PCM_RUNTIME_CHECK(substream))
507 return -ENXIO;
508 runtime = substream->runtime;
509 snd_pcm_stream_lock_irq(substream);
510 switch (runtime->status->state) {
511 case SNDRV_PCM_STATE_SETUP:
512 case SNDRV_PCM_STATE_PREPARED:
513 break;
514 default:
515 snd_pcm_stream_unlock_irq(substream);
516 return -EBADFD;
517 }
518 snd_pcm_stream_unlock_irq(substream);
519 if (atomic_read(&substream->mmap_count))
520 return -EBADFD;
521 if (substream->ops->hw_free)
522 result = substream->ops->hw_free(substream);
523 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
524 pm_qos_remove_request(&substream->latency_pm_qos_req);
525 return result;
526 }
527
528 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
529 struct snd_pcm_sw_params *params)
530 {
531 struct snd_pcm_runtime *runtime;
532 int err;
533
534 if (PCM_RUNTIME_CHECK(substream))
535 return -ENXIO;
536 runtime = substream->runtime;
537 snd_pcm_stream_lock_irq(substream);
538 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
539 snd_pcm_stream_unlock_irq(substream);
540 return -EBADFD;
541 }
542 snd_pcm_stream_unlock_irq(substream);
543
544 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
545 return -EINVAL;
546 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
547 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
548 return -EINVAL;
549 if (params->avail_min == 0)
550 return -EINVAL;
551 if (params->silence_size >= runtime->boundary) {
552 if (params->silence_threshold != 0)
553 return -EINVAL;
554 } else {
555 if (params->silence_size > params->silence_threshold)
556 return -EINVAL;
557 if (params->silence_threshold > runtime->buffer_size)
558 return -EINVAL;
559 }
560 err = 0;
561 snd_pcm_stream_lock_irq(substream);
562 runtime->tstamp_mode = params->tstamp_mode;
563 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
564 runtime->tstamp_type = params->tstamp_type;
565 runtime->period_step = params->period_step;
566 runtime->control->avail_min = params->avail_min;
567 runtime->start_threshold = params->start_threshold;
568 runtime->stop_threshold = params->stop_threshold;
569 runtime->silence_threshold = params->silence_threshold;
570 runtime->silence_size = params->silence_size;
571 params->boundary = runtime->boundary;
572 if (snd_pcm_running(substream)) {
573 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
574 runtime->silence_size > 0)
575 snd_pcm_playback_silence(substream, ULONG_MAX);
576 err = snd_pcm_update_state(substream, runtime);
577 }
578 snd_pcm_stream_unlock_irq(substream);
579 return err;
580 }
581
582 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
583 struct snd_pcm_sw_params __user * _params)
584 {
585 struct snd_pcm_sw_params params;
586 int err;
587 if (copy_from_user(&params, _params, sizeof(params)))
588 return -EFAULT;
589 err = snd_pcm_sw_params(substream, &params);
590 if (copy_to_user(_params, &params, sizeof(params)))
591 return -EFAULT;
592 return err;
593 }
594
595 int snd_pcm_status(struct snd_pcm_substream *substream,
596 struct snd_pcm_status *status)
597 {
598 struct snd_pcm_runtime *runtime = substream->runtime;
599
600 snd_pcm_stream_lock_irq(substream);
601 status->state = runtime->status->state;
602 status->suspended_state = runtime->status->suspended_state;
603 if (status->state == SNDRV_PCM_STATE_OPEN)
604 goto _end;
605 status->trigger_tstamp = runtime->trigger_tstamp;
606 if (snd_pcm_running(substream)) {
607 snd_pcm_update_hw_ptr(substream);
608 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
609 status->tstamp = runtime->status->tstamp;
610 status->audio_tstamp =
611 runtime->status->audio_tstamp;
612 goto _tstamp_end;
613 }
614 }
615 snd_pcm_gettime(runtime, &status->tstamp);
616 _tstamp_end:
617 status->appl_ptr = runtime->control->appl_ptr;
618 status->hw_ptr = runtime->status->hw_ptr;
619 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
620 status->avail = snd_pcm_playback_avail(runtime);
621 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
622 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
623 status->delay = runtime->buffer_size - status->avail;
624 status->delay += runtime->delay;
625 } else
626 status->delay = 0;
627 } else {
628 status->avail = snd_pcm_capture_avail(runtime);
629 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
630 status->delay = status->avail + runtime->delay;
631 else
632 status->delay = 0;
633 }
634 status->avail_max = runtime->avail_max;
635 status->overrange = runtime->overrange;
636 runtime->avail_max = 0;
637 runtime->overrange = 0;
638 _end:
639 snd_pcm_stream_unlock_irq(substream);
640 return 0;
641 }
642
643 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
644 struct snd_pcm_status __user * _status)
645 {
646 struct snd_pcm_status status;
647 int res;
648
649 memset(&status, 0, sizeof(status));
650 res = snd_pcm_status(substream, &status);
651 if (res < 0)
652 return res;
653 if (copy_to_user(_status, &status, sizeof(status)))
654 return -EFAULT;
655 return 0;
656 }
657
658 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
659 struct snd_pcm_channel_info * info)
660 {
661 struct snd_pcm_runtime *runtime;
662 unsigned int channel;
663
664 channel = info->channel;
665 runtime = substream->runtime;
666 snd_pcm_stream_lock_irq(substream);
667 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
668 snd_pcm_stream_unlock_irq(substream);
669 return -EBADFD;
670 }
671 snd_pcm_stream_unlock_irq(substream);
672 if (channel >= runtime->channels)
673 return -EINVAL;
674 memset(info, 0, sizeof(*info));
675 info->channel = channel;
676 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
677 }
678
679 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
680 struct snd_pcm_channel_info __user * _info)
681 {
682 struct snd_pcm_channel_info info;
683 int res;
684
685 if (copy_from_user(&info, _info, sizeof(info)))
686 return -EFAULT;
687 res = snd_pcm_channel_info(substream, &info);
688 if (res < 0)
689 return res;
690 if (copy_to_user(_info, &info, sizeof(info)))
691 return -EFAULT;
692 return 0;
693 }
694
695 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
696 {
697 struct snd_pcm_runtime *runtime = substream->runtime;
698 if (runtime->trigger_master == NULL)
699 return;
700 if (runtime->trigger_master == substream) {
701 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
702 } else {
703 snd_pcm_trigger_tstamp(runtime->trigger_master);
704 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
705 }
706 runtime->trigger_master = NULL;
707 }
708
709 struct action_ops {
710 int (*pre_action)(struct snd_pcm_substream *substream, int state);
711 int (*do_action)(struct snd_pcm_substream *substream, int state);
712 void (*undo_action)(struct snd_pcm_substream *substream, int state);
713 void (*post_action)(struct snd_pcm_substream *substream, int state);
714 };
715
716 /*
717 * this functions is core for handling of linked stream
718 * Note: the stream state might be changed also on failure
719 * Note2: call with calling stream lock + link lock
720 */
721 static int snd_pcm_action_group(struct action_ops *ops,
722 struct snd_pcm_substream *substream,
723 int state, int do_lock)
724 {
725 struct snd_pcm_substream *s = NULL;
726 struct snd_pcm_substream *s1;
727 int res = 0;
728
729 snd_pcm_group_for_each_entry(s, substream) {
730 if (do_lock && s != substream)
731 spin_lock_nested(&s->self_group.lock,
732 SINGLE_DEPTH_NESTING);
733 res = ops->pre_action(s, state);
734 if (res < 0)
735 goto _unlock;
736 }
737 snd_pcm_group_for_each_entry(s, substream) {
738 res = ops->do_action(s, state);
739 if (res < 0) {
740 if (ops->undo_action) {
741 snd_pcm_group_for_each_entry(s1, substream) {
742 if (s1 == s) /* failed stream */
743 break;
744 ops->undo_action(s1, state);
745 }
746 }
747 s = NULL; /* unlock all */
748 goto _unlock;
749 }
750 }
751 snd_pcm_group_for_each_entry(s, substream) {
752 ops->post_action(s, state);
753 }
754 _unlock:
755 if (do_lock) {
756 /* unlock streams */
757 snd_pcm_group_for_each_entry(s1, substream) {
758 if (s1 != substream)
759 spin_unlock(&s1->self_group.lock);
760 if (s1 == s) /* end */
761 break;
762 }
763 }
764 return res;
765 }
766
767 /*
768 * Note: call with stream lock
769 */
770 static int snd_pcm_action_single(struct action_ops *ops,
771 struct snd_pcm_substream *substream,
772 int state)
773 {
774 int res;
775
776 res = ops->pre_action(substream, state);
777 if (res < 0)
778 return res;
779 res = ops->do_action(substream, state);
780 if (res == 0)
781 ops->post_action(substream, state);
782 else if (ops->undo_action)
783 ops->undo_action(substream, state);
784 return res;
785 }
786
787 /*
788 * Note: call with stream lock
789 */
790 static int snd_pcm_action(struct action_ops *ops,
791 struct snd_pcm_substream *substream,
792 int state)
793 {
794 int res;
795
796 if (snd_pcm_stream_linked(substream)) {
797 if (!spin_trylock(&substream->group->lock)) {
798 spin_unlock(&substream->self_group.lock);
799 spin_lock(&substream->group->lock);
800 spin_lock(&substream->self_group.lock);
801 }
802 res = snd_pcm_action_group(ops, substream, state, 1);
803 spin_unlock(&substream->group->lock);
804 } else {
805 res = snd_pcm_action_single(ops, substream, state);
806 }
807 return res;
808 }
809
810 /*
811 * Note: don't use any locks before
812 */
813 static int snd_pcm_action_lock_irq(struct action_ops *ops,
814 struct snd_pcm_substream *substream,
815 int state)
816 {
817 int res;
818
819 read_lock_irq(&snd_pcm_link_rwlock);
820 if (snd_pcm_stream_linked(substream)) {
821 spin_lock(&substream->group->lock);
822 spin_lock(&substream->self_group.lock);
823 res = snd_pcm_action_group(ops, substream, state, 1);
824 spin_unlock(&substream->self_group.lock);
825 spin_unlock(&substream->group->lock);
826 } else {
827 spin_lock(&substream->self_group.lock);
828 res = snd_pcm_action_single(ops, substream, state);
829 spin_unlock(&substream->self_group.lock);
830 }
831 read_unlock_irq(&snd_pcm_link_rwlock);
832 return res;
833 }
834
835 /*
836 */
837 static int snd_pcm_action_nonatomic(struct action_ops *ops,
838 struct snd_pcm_substream *substream,
839 int state)
840 {
841 int res;
842
843 down_read(&snd_pcm_link_rwsem);
844 if (snd_pcm_stream_linked(substream))
845 res = snd_pcm_action_group(ops, substream, state, 0);
846 else
847 res = snd_pcm_action_single(ops, substream, state);
848 up_read(&snd_pcm_link_rwsem);
849 return res;
850 }
851
852 /*
853 * start callbacks
854 */
855 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
856 {
857 struct snd_pcm_runtime *runtime = substream->runtime;
858 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
859 return -EBADFD;
860 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
861 !snd_pcm_playback_data(substream))
862 return -EPIPE;
863 runtime->trigger_master = substream;
864 return 0;
865 }
866
867 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
868 {
869 if (substream->runtime->trigger_master != substream)
870 return 0;
871 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
872 }
873
874 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
875 {
876 if (substream->runtime->trigger_master == substream)
877 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
878 }
879
880 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
881 {
882 struct snd_pcm_runtime *runtime = substream->runtime;
883 snd_pcm_trigger_tstamp(substream);
884 runtime->hw_ptr_jiffies = jiffies;
885 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
886 runtime->rate;
887 runtime->status->state = state;
888 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
889 runtime->silence_size > 0)
890 snd_pcm_playback_silence(substream, ULONG_MAX);
891 if (substream->timer)
892 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
893 &runtime->trigger_tstamp);
894 }
895
896 static struct action_ops snd_pcm_action_start = {
897 .pre_action = snd_pcm_pre_start,
898 .do_action = snd_pcm_do_start,
899 .undo_action = snd_pcm_undo_start,
900 .post_action = snd_pcm_post_start
901 };
902
903 /**
904 * snd_pcm_start - start all linked streams
905 * @substream: the PCM substream instance
906 *
907 * Return: Zero if successful, or a negative error code.
908 */
909 int snd_pcm_start(struct snd_pcm_substream *substream)
910 {
911 return snd_pcm_action(&snd_pcm_action_start, substream,
912 SNDRV_PCM_STATE_RUNNING);
913 }
914
915 /*
916 * stop callbacks
917 */
918 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
919 {
920 struct snd_pcm_runtime *runtime = substream->runtime;
921 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
922 return -EBADFD;
923 runtime->trigger_master = substream;
924 return 0;
925 }
926
927 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
928 {
929 if (substream->runtime->trigger_master == substream &&
930 snd_pcm_running(substream))
931 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
932 return 0; /* unconditonally stop all substreams */
933 }
934
935 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
936 {
937 struct snd_pcm_runtime *runtime = substream->runtime;
938 if (runtime->status->state != state) {
939 snd_pcm_trigger_tstamp(substream);
940 if (substream->timer)
941 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
942 &runtime->trigger_tstamp);
943 runtime->status->state = state;
944 }
945 wake_up(&runtime->sleep);
946 wake_up(&runtime->tsleep);
947 }
948
949 static struct action_ops snd_pcm_action_stop = {
950 .pre_action = snd_pcm_pre_stop,
951 .do_action = snd_pcm_do_stop,
952 .post_action = snd_pcm_post_stop
953 };
954
955 /**
956 * snd_pcm_stop - try to stop all running streams in the substream group
957 * @substream: the PCM substream instance
958 * @state: PCM state after stopping the stream
959 *
960 * The state of each stream is then changed to the given state unconditionally.
961 *
962 * Return: Zero if successful, or a negative error code.
963 */
964 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
965 {
966 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
967 }
968
969 EXPORT_SYMBOL(snd_pcm_stop);
970
971 /**
972 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
973 * @substream: the PCM substream
974 *
975 * After stopping, the state is changed to SETUP.
976 * Unlike snd_pcm_stop(), this affects only the given stream.
977 *
978 * Return: Zero if succesful, or a negative error code.
979 */
980 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
981 {
982 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
983 SNDRV_PCM_STATE_SETUP);
984 }
985
986 /*
987 * pause callbacks
988 */
989 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
990 {
991 struct snd_pcm_runtime *runtime = substream->runtime;
992 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
993 return -ENOSYS;
994 if (push) {
995 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
996 return -EBADFD;
997 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
998 return -EBADFD;
999 runtime->trigger_master = substream;
1000 return 0;
1001 }
1002
1003 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1004 {
1005 if (substream->runtime->trigger_master != substream)
1006 return 0;
1007 /* some drivers might use hw_ptr to recover from the pause -
1008 update the hw_ptr now */
1009 if (push)
1010 snd_pcm_update_hw_ptr(substream);
1011 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1012 * a delta between the current jiffies, this gives a large enough
1013 * delta, effectively to skip the check once.
1014 */
1015 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1016 return substream->ops->trigger(substream,
1017 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1018 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1019 }
1020
1021 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1022 {
1023 if (substream->runtime->trigger_master == substream)
1024 substream->ops->trigger(substream,
1025 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1026 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1027 }
1028
1029 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1030 {
1031 struct snd_pcm_runtime *runtime = substream->runtime;
1032 snd_pcm_trigger_tstamp(substream);
1033 if (push) {
1034 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1035 if (substream->timer)
1036 snd_timer_notify(substream->timer,
1037 SNDRV_TIMER_EVENT_MPAUSE,
1038 &runtime->trigger_tstamp);
1039 wake_up(&runtime->sleep);
1040 wake_up(&runtime->tsleep);
1041 } else {
1042 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1043 if (substream->timer)
1044 snd_timer_notify(substream->timer,
1045 SNDRV_TIMER_EVENT_MCONTINUE,
1046 &runtime->trigger_tstamp);
1047 }
1048 }
1049
1050 static struct action_ops snd_pcm_action_pause = {
1051 .pre_action = snd_pcm_pre_pause,
1052 .do_action = snd_pcm_do_pause,
1053 .undo_action = snd_pcm_undo_pause,
1054 .post_action = snd_pcm_post_pause
1055 };
1056
1057 /*
1058 * Push/release the pause for all linked streams.
1059 */
1060 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1061 {
1062 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1063 }
1064
1065 #ifdef CONFIG_PM
1066 /* suspend */
1067
1068 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1069 {
1070 struct snd_pcm_runtime *runtime = substream->runtime;
1071 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1072 return -EBUSY;
1073 runtime->trigger_master = substream;
1074 return 0;
1075 }
1076
1077 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1078 {
1079 struct snd_pcm_runtime *runtime = substream->runtime;
1080 if (runtime->trigger_master != substream)
1081 return 0;
1082 if (! snd_pcm_running(substream))
1083 return 0;
1084 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1085 return 0; /* suspend unconditionally */
1086 }
1087
1088 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1089 {
1090 struct snd_pcm_runtime *runtime = substream->runtime;
1091 snd_pcm_trigger_tstamp(substream);
1092 if (substream->timer)
1093 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1094 &runtime->trigger_tstamp);
1095 runtime->status->suspended_state = runtime->status->state;
1096 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1097 wake_up(&runtime->sleep);
1098 wake_up(&runtime->tsleep);
1099 }
1100
1101 static struct action_ops snd_pcm_action_suspend = {
1102 .pre_action = snd_pcm_pre_suspend,
1103 .do_action = snd_pcm_do_suspend,
1104 .post_action = snd_pcm_post_suspend
1105 };
1106
1107 /**
1108 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1109 * @substream: the PCM substream
1110 *
1111 * After this call, all streams are changed to SUSPENDED state.
1112 *
1113 * Return: Zero if successful (or @substream is %NULL), or a negative error
1114 * code.
1115 */
1116 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1117 {
1118 int err;
1119 unsigned long flags;
1120
1121 if (! substream)
1122 return 0;
1123
1124 snd_pcm_stream_lock_irqsave(substream, flags);
1125 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1126 snd_pcm_stream_unlock_irqrestore(substream, flags);
1127 return err;
1128 }
1129
1130 EXPORT_SYMBOL(snd_pcm_suspend);
1131
1132 /**
1133 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1134 * @pcm: the PCM instance
1135 *
1136 * After this call, all streams are changed to SUSPENDED state.
1137 *
1138 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1139 */
1140 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1141 {
1142 struct snd_pcm_substream *substream;
1143 int stream, err = 0;
1144
1145 if (! pcm)
1146 return 0;
1147
1148 for (stream = 0; stream < 2; stream++) {
1149 for (substream = pcm->streams[stream].substream;
1150 substream; substream = substream->next) {
1151 /* FIXME: the open/close code should lock this as well */
1152 if (substream->runtime == NULL)
1153 continue;
1154 err = snd_pcm_suspend(substream);
1155 if (err < 0 && err != -EBUSY)
1156 return err;
1157 }
1158 }
1159 return 0;
1160 }
1161
1162 EXPORT_SYMBOL(snd_pcm_suspend_all);
1163
1164 /* resume */
1165
1166 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1167 {
1168 struct snd_pcm_runtime *runtime = substream->runtime;
1169 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1170 return -ENOSYS;
1171 runtime->trigger_master = substream;
1172 return 0;
1173 }
1174
1175 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1176 {
1177 struct snd_pcm_runtime *runtime = substream->runtime;
1178 if (runtime->trigger_master != substream)
1179 return 0;
1180 /* DMA not running previously? */
1181 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1182 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1183 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1184 return 0;
1185 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1186 }
1187
1188 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1189 {
1190 if (substream->runtime->trigger_master == substream &&
1191 snd_pcm_running(substream))
1192 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1193 }
1194
1195 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1196 {
1197 struct snd_pcm_runtime *runtime = substream->runtime;
1198 snd_pcm_trigger_tstamp(substream);
1199 if (substream->timer)
1200 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1201 &runtime->trigger_tstamp);
1202 runtime->status->state = runtime->status->suspended_state;
1203 }
1204
1205 static struct action_ops snd_pcm_action_resume = {
1206 .pre_action = snd_pcm_pre_resume,
1207 .do_action = snd_pcm_do_resume,
1208 .undo_action = snd_pcm_undo_resume,
1209 .post_action = snd_pcm_post_resume
1210 };
1211
1212 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1213 {
1214 struct snd_card *card = substream->pcm->card;
1215 int res;
1216
1217 snd_power_lock(card);
1218 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1219 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1220 snd_power_unlock(card);
1221 return res;
1222 }
1223
1224 #else
1225
1226 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1227 {
1228 return -ENOSYS;
1229 }
1230
1231 #endif /* CONFIG_PM */
1232
1233 /*
1234 * xrun ioctl
1235 *
1236 * Change the RUNNING stream(s) to XRUN state.
1237 */
1238 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1239 {
1240 struct snd_card *card = substream->pcm->card;
1241 struct snd_pcm_runtime *runtime = substream->runtime;
1242 int result;
1243
1244 snd_power_lock(card);
1245 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1246 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1247 if (result < 0)
1248 goto _unlock;
1249 }
1250
1251 snd_pcm_stream_lock_irq(substream);
1252 switch (runtime->status->state) {
1253 case SNDRV_PCM_STATE_XRUN:
1254 result = 0; /* already there */
1255 break;
1256 case SNDRV_PCM_STATE_RUNNING:
1257 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1258 break;
1259 default:
1260 result = -EBADFD;
1261 }
1262 snd_pcm_stream_unlock_irq(substream);
1263 _unlock:
1264 snd_power_unlock(card);
1265 return result;
1266 }
1267
1268 /*
1269 * reset ioctl
1270 */
1271 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1272 {
1273 struct snd_pcm_runtime *runtime = substream->runtime;
1274 switch (runtime->status->state) {
1275 case SNDRV_PCM_STATE_RUNNING:
1276 case SNDRV_PCM_STATE_PREPARED:
1277 case SNDRV_PCM_STATE_PAUSED:
1278 case SNDRV_PCM_STATE_SUSPENDED:
1279 return 0;
1280 default:
1281 return -EBADFD;
1282 }
1283 }
1284
1285 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1286 {
1287 struct snd_pcm_runtime *runtime = substream->runtime;
1288 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1289 if (err < 0)
1290 return err;
1291 runtime->hw_ptr_base = 0;
1292 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1293 runtime->status->hw_ptr % runtime->period_size;
1294 runtime->silence_start = runtime->status->hw_ptr;
1295 runtime->silence_filled = 0;
1296 return 0;
1297 }
1298
1299 static void snd_pcm_post_reset(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 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1304 runtime->silence_size > 0)
1305 snd_pcm_playback_silence(substream, ULONG_MAX);
1306 }
1307
1308 static struct action_ops snd_pcm_action_reset = {
1309 .pre_action = snd_pcm_pre_reset,
1310 .do_action = snd_pcm_do_reset,
1311 .post_action = snd_pcm_post_reset
1312 };
1313
1314 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1315 {
1316 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1317 }
1318
1319 /*
1320 * prepare ioctl
1321 */
1322 /* we use the second argument for updating f_flags */
1323 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1324 int f_flags)
1325 {
1326 struct snd_pcm_runtime *runtime = substream->runtime;
1327 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1328 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1329 return -EBADFD;
1330 if (snd_pcm_running(substream))
1331 return -EBUSY;
1332 substream->f_flags = f_flags;
1333 return 0;
1334 }
1335
1336 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1337 {
1338 int err;
1339 err = substream->ops->prepare(substream);
1340 if (err < 0)
1341 return err;
1342 return snd_pcm_do_reset(substream, 0);
1343 }
1344
1345 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1346 {
1347 struct snd_pcm_runtime *runtime = substream->runtime;
1348 runtime->control->appl_ptr = runtime->status->hw_ptr;
1349 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1350 }
1351
1352 static struct action_ops snd_pcm_action_prepare = {
1353 .pre_action = snd_pcm_pre_prepare,
1354 .do_action = snd_pcm_do_prepare,
1355 .post_action = snd_pcm_post_prepare
1356 };
1357
1358 /**
1359 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1360 * @substream: the PCM substream instance
1361 * @file: file to refer f_flags
1362 *
1363 * Return: Zero if successful, or a negative error code.
1364 */
1365 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1366 struct file *file)
1367 {
1368 int res;
1369 struct snd_card *card = substream->pcm->card;
1370 int f_flags;
1371
1372 if (file)
1373 f_flags = file->f_flags;
1374 else
1375 f_flags = substream->f_flags;
1376
1377 snd_power_lock(card);
1378 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1379 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1380 substream, f_flags);
1381 snd_power_unlock(card);
1382 return res;
1383 }
1384
1385 /*
1386 * drain ioctl
1387 */
1388
1389 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1390 {
1391 struct snd_pcm_runtime *runtime = substream->runtime;
1392 switch (runtime->status->state) {
1393 case SNDRV_PCM_STATE_OPEN:
1394 case SNDRV_PCM_STATE_DISCONNECTED:
1395 case SNDRV_PCM_STATE_SUSPENDED:
1396 return -EBADFD;
1397 }
1398 runtime->trigger_master = substream;
1399 return 0;
1400 }
1401
1402 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1403 {
1404 struct snd_pcm_runtime *runtime = substream->runtime;
1405 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1406 switch (runtime->status->state) {
1407 case SNDRV_PCM_STATE_PREPARED:
1408 /* start playback stream if possible */
1409 if (! snd_pcm_playback_empty(substream)) {
1410 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1411 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1412 }
1413 break;
1414 case SNDRV_PCM_STATE_RUNNING:
1415 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1416 break;
1417 case SNDRV_PCM_STATE_XRUN:
1418 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1419 break;
1420 default:
1421 break;
1422 }
1423 } else {
1424 /* stop running stream */
1425 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1426 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1427 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1428 snd_pcm_do_stop(substream, new_state);
1429 snd_pcm_post_stop(substream, new_state);
1430 }
1431 }
1432 return 0;
1433 }
1434
1435 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1436 {
1437 }
1438
1439 static struct action_ops snd_pcm_action_drain_init = {
1440 .pre_action = snd_pcm_pre_drain_init,
1441 .do_action = snd_pcm_do_drain_init,
1442 .post_action = snd_pcm_post_drain_init
1443 };
1444
1445 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1446
1447 /*
1448 * Drain the stream(s).
1449 * When the substream is linked, sync until the draining of all playback streams
1450 * is finished.
1451 * After this call, all streams are supposed to be either SETUP or DRAINING
1452 * (capture only) state.
1453 */
1454 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1455 struct file *file)
1456 {
1457 struct snd_card *card;
1458 struct snd_pcm_runtime *runtime;
1459 struct snd_pcm_substream *s;
1460 wait_queue_t wait;
1461 int result = 0;
1462 int nonblock = 0;
1463
1464 card = substream->pcm->card;
1465 runtime = substream->runtime;
1466
1467 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1468 return -EBADFD;
1469
1470 snd_power_lock(card);
1471 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1472 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1473 if (result < 0) {
1474 snd_power_unlock(card);
1475 return result;
1476 }
1477 }
1478
1479 if (file) {
1480 if (file->f_flags & O_NONBLOCK)
1481 nonblock = 1;
1482 } else if (substream->f_flags & O_NONBLOCK)
1483 nonblock = 1;
1484
1485 down_read(&snd_pcm_link_rwsem);
1486 snd_pcm_stream_lock_irq(substream);
1487 /* resume pause */
1488 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1489 snd_pcm_pause(substream, 0);
1490
1491 /* pre-start/stop - all running streams are changed to DRAINING state */
1492 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1493 if (result < 0)
1494 goto unlock;
1495 /* in non-blocking, we don't wait in ioctl but let caller poll */
1496 if (nonblock) {
1497 result = -EAGAIN;
1498 goto unlock;
1499 }
1500
1501 for (;;) {
1502 long tout;
1503 struct snd_pcm_runtime *to_check;
1504 if (signal_pending(current)) {
1505 result = -ERESTARTSYS;
1506 break;
1507 }
1508 /* find a substream to drain */
1509 to_check = NULL;
1510 snd_pcm_group_for_each_entry(s, substream) {
1511 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1512 continue;
1513 runtime = s->runtime;
1514 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1515 to_check = runtime;
1516 break;
1517 }
1518 }
1519 if (!to_check)
1520 break; /* all drained */
1521 init_waitqueue_entry(&wait, current);
1522 add_wait_queue(&to_check->sleep, &wait);
1523 snd_pcm_stream_unlock_irq(substream);
1524 up_read(&snd_pcm_link_rwsem);
1525 snd_power_unlock(card);
1526 if (runtime->no_period_wakeup)
1527 tout = MAX_SCHEDULE_TIMEOUT;
1528 else {
1529 tout = 10;
1530 if (runtime->rate) {
1531 long t = runtime->period_size * 2 / runtime->rate;
1532 tout = max(t, tout);
1533 }
1534 tout = msecs_to_jiffies(tout * 1000);
1535 }
1536 tout = schedule_timeout_interruptible(tout);
1537 snd_power_lock(card);
1538 down_read(&snd_pcm_link_rwsem);
1539 snd_pcm_stream_lock_irq(substream);
1540 remove_wait_queue(&to_check->sleep, &wait);
1541 if (card->shutdown) {
1542 result = -ENODEV;
1543 break;
1544 }
1545 if (tout == 0) {
1546 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1547 result = -ESTRPIPE;
1548 else {
1549 dev_dbg(substream->pcm->card->dev,
1550 "playback drain error (DMA or IRQ trouble?)\n");
1551 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1552 result = -EIO;
1553 }
1554 break;
1555 }
1556 }
1557
1558 unlock:
1559 snd_pcm_stream_unlock_irq(substream);
1560 up_read(&snd_pcm_link_rwsem);
1561 snd_power_unlock(card);
1562
1563 return result;
1564 }
1565
1566 /*
1567 * drop ioctl
1568 *
1569 * Immediately put all linked substreams into SETUP state.
1570 */
1571 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1572 {
1573 struct snd_pcm_runtime *runtime;
1574 int result = 0;
1575
1576 if (PCM_RUNTIME_CHECK(substream))
1577 return -ENXIO;
1578 runtime = substream->runtime;
1579
1580 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1581 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1582 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1583 return -EBADFD;
1584
1585 snd_pcm_stream_lock_irq(substream);
1586 /* resume pause */
1587 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1588 snd_pcm_pause(substream, 0);
1589
1590 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1591 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1592 snd_pcm_stream_unlock_irq(substream);
1593
1594 return result;
1595 }
1596
1597
1598 static bool is_pcm_file(struct file *file)
1599 {
1600 struct inode *inode = file_inode(file);
1601 unsigned int minor;
1602
1603 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1604 return false;
1605 minor = iminor(inode);
1606 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1607 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1608 }
1609
1610 /*
1611 * PCM link handling
1612 */
1613 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1614 {
1615 int res = 0;
1616 struct snd_pcm_file *pcm_file;
1617 struct snd_pcm_substream *substream1;
1618 struct snd_pcm_group *group;
1619 struct fd f = fdget(fd);
1620
1621 if (!f.file)
1622 return -EBADFD;
1623 if (!is_pcm_file(f.file)) {
1624 res = -EBADFD;
1625 goto _badf;
1626 }
1627 pcm_file = f.file->private_data;
1628 substream1 = pcm_file->substream;
1629 group = kmalloc(sizeof(*group), GFP_KERNEL);
1630 if (!group) {
1631 res = -ENOMEM;
1632 goto _nolock;
1633 }
1634 down_write(&snd_pcm_link_rwsem);
1635 write_lock_irq(&snd_pcm_link_rwlock);
1636 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1637 substream->runtime->status->state != substream1->runtime->status->state) {
1638 res = -EBADFD;
1639 goto _end;
1640 }
1641 if (snd_pcm_stream_linked(substream1)) {
1642 res = -EALREADY;
1643 goto _end;
1644 }
1645 if (!snd_pcm_stream_linked(substream)) {
1646 substream->group = group;
1647 group = NULL;
1648 spin_lock_init(&substream->group->lock);
1649 INIT_LIST_HEAD(&substream->group->substreams);
1650 list_add_tail(&substream->link_list, &substream->group->substreams);
1651 substream->group->count = 1;
1652 }
1653 list_add_tail(&substream1->link_list, &substream->group->substreams);
1654 substream->group->count++;
1655 substream1->group = substream->group;
1656 _end:
1657 write_unlock_irq(&snd_pcm_link_rwlock);
1658 up_write(&snd_pcm_link_rwsem);
1659 _nolock:
1660 snd_card_unref(substream1->pcm->card);
1661 kfree(group);
1662 _badf:
1663 fdput(f);
1664 return res;
1665 }
1666
1667 static void relink_to_local(struct snd_pcm_substream *substream)
1668 {
1669 substream->group = &substream->self_group;
1670 INIT_LIST_HEAD(&substream->self_group.substreams);
1671 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1672 }
1673
1674 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1675 {
1676 struct snd_pcm_substream *s;
1677 int res = 0;
1678
1679 down_write(&snd_pcm_link_rwsem);
1680 write_lock_irq(&snd_pcm_link_rwlock);
1681 if (!snd_pcm_stream_linked(substream)) {
1682 res = -EALREADY;
1683 goto _end;
1684 }
1685 list_del(&substream->link_list);
1686 substream->group->count--;
1687 if (substream->group->count == 1) { /* detach the last stream, too */
1688 snd_pcm_group_for_each_entry(s, substream) {
1689 relink_to_local(s);
1690 break;
1691 }
1692 kfree(substream->group);
1693 }
1694 relink_to_local(substream);
1695 _end:
1696 write_unlock_irq(&snd_pcm_link_rwlock);
1697 up_write(&snd_pcm_link_rwsem);
1698 return res;
1699 }
1700
1701 /*
1702 * hw configurator
1703 */
1704 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1705 struct snd_pcm_hw_rule *rule)
1706 {
1707 struct snd_interval t;
1708 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1709 hw_param_interval_c(params, rule->deps[1]), &t);
1710 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1711 }
1712
1713 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1714 struct snd_pcm_hw_rule *rule)
1715 {
1716 struct snd_interval t;
1717 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1718 hw_param_interval_c(params, rule->deps[1]), &t);
1719 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1720 }
1721
1722 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1723 struct snd_pcm_hw_rule *rule)
1724 {
1725 struct snd_interval t;
1726 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1727 hw_param_interval_c(params, rule->deps[1]),
1728 (unsigned long) rule->private, &t);
1729 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1730 }
1731
1732 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1733 struct snd_pcm_hw_rule *rule)
1734 {
1735 struct snd_interval t;
1736 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1737 (unsigned long) rule->private,
1738 hw_param_interval_c(params, rule->deps[1]), &t);
1739 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1740 }
1741
1742 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1743 struct snd_pcm_hw_rule *rule)
1744 {
1745 unsigned int k;
1746 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1747 struct snd_mask m;
1748 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1749 snd_mask_any(&m);
1750 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1751 int bits;
1752 if (! snd_mask_test(mask, k))
1753 continue;
1754 bits = snd_pcm_format_physical_width(k);
1755 if (bits <= 0)
1756 continue; /* ignore invalid formats */
1757 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1758 snd_mask_reset(&m, k);
1759 }
1760 return snd_mask_refine(mask, &m);
1761 }
1762
1763 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1764 struct snd_pcm_hw_rule *rule)
1765 {
1766 struct snd_interval t;
1767 unsigned int k;
1768 t.min = UINT_MAX;
1769 t.max = 0;
1770 t.openmin = 0;
1771 t.openmax = 0;
1772 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1773 int bits;
1774 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1775 continue;
1776 bits = snd_pcm_format_physical_width(k);
1777 if (bits <= 0)
1778 continue; /* ignore invalid formats */
1779 if (t.min > (unsigned)bits)
1780 t.min = bits;
1781 if (t.max < (unsigned)bits)
1782 t.max = bits;
1783 }
1784 t.integer = 1;
1785 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1786 }
1787
1788 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1789 #error "Change this table"
1790 #endif
1791
1792 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1793 48000, 64000, 88200, 96000, 176400, 192000 };
1794
1795 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1796 .count = ARRAY_SIZE(rates),
1797 .list = rates,
1798 };
1799
1800 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1801 struct snd_pcm_hw_rule *rule)
1802 {
1803 struct snd_pcm_hardware *hw = rule->private;
1804 return snd_interval_list(hw_param_interval(params, rule->var),
1805 snd_pcm_known_rates.count,
1806 snd_pcm_known_rates.list, hw->rates);
1807 }
1808
1809 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1810 struct snd_pcm_hw_rule *rule)
1811 {
1812 struct snd_interval t;
1813 struct snd_pcm_substream *substream = rule->private;
1814 t.min = 0;
1815 t.max = substream->buffer_bytes_max;
1816 t.openmin = 0;
1817 t.openmax = 0;
1818 t.integer = 1;
1819 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1820 }
1821
1822 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1823 {
1824 struct snd_pcm_runtime *runtime = substream->runtime;
1825 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1826 int k, err;
1827
1828 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1829 snd_mask_any(constrs_mask(constrs, k));
1830 }
1831
1832 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1833 snd_interval_any(constrs_interval(constrs, k));
1834 }
1835
1836 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1837 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1838 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1839 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1840 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1841
1842 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1843 snd_pcm_hw_rule_format, NULL,
1844 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_SAMPLE_BITS,
1848 snd_pcm_hw_rule_sample_bits, NULL,
1849 SNDRV_PCM_HW_PARAM_FORMAT,
1850 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1851 if (err < 0)
1852 return err;
1853 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1854 snd_pcm_hw_rule_div, NULL,
1855 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1856 if (err < 0)
1857 return err;
1858 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1859 snd_pcm_hw_rule_mul, NULL,
1860 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1861 if (err < 0)
1862 return err;
1863 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1864 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1865 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1866 if (err < 0)
1867 return err;
1868 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1869 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1870 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1871 if (err < 0)
1872 return err;
1873 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1874 snd_pcm_hw_rule_div, NULL,
1875 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1876 if (err < 0)
1877 return err;
1878 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1879 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1880 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1881 if (err < 0)
1882 return err;
1883 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1884 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1885 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1886 if (err < 0)
1887 return err;
1888 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1889 snd_pcm_hw_rule_div, NULL,
1890 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1891 if (err < 0)
1892 return err;
1893 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1894 snd_pcm_hw_rule_div, NULL,
1895 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1896 if (err < 0)
1897 return err;
1898 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1899 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1900 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1901 if (err < 0)
1902 return err;
1903 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1904 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1905 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1906 if (err < 0)
1907 return err;
1908 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1909 snd_pcm_hw_rule_mul, NULL,
1910 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1911 if (err < 0)
1912 return err;
1913 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1914 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1915 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1916 if (err < 0)
1917 return err;
1918 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1919 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1920 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1921 if (err < 0)
1922 return err;
1923 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1924 snd_pcm_hw_rule_muldivk, (void*) 8,
1925 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1926 if (err < 0)
1927 return err;
1928 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1929 snd_pcm_hw_rule_muldivk, (void*) 8,
1930 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1931 if (err < 0)
1932 return err;
1933 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1934 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1935 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1936 if (err < 0)
1937 return err;
1938 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1939 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1940 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1941 if (err < 0)
1942 return err;
1943 return 0;
1944 }
1945
1946 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1947 {
1948 struct snd_pcm_runtime *runtime = substream->runtime;
1949 struct snd_pcm_hardware *hw = &runtime->hw;
1950 int err;
1951 unsigned int mask = 0;
1952
1953 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1954 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1955 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1956 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1957 if (hw->info & SNDRV_PCM_INFO_MMAP) {
1958 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1959 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1960 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1961 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1962 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1963 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1964 }
1965 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1966 if (err < 0)
1967 return err;
1968
1969 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1970 if (err < 0)
1971 return err;
1972
1973 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1974 if (err < 0)
1975 return err;
1976
1977 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1978 hw->channels_min, hw->channels_max);
1979 if (err < 0)
1980 return err;
1981
1982 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1983 hw->rate_min, hw->rate_max);
1984 if (err < 0)
1985 return err;
1986
1987 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1988 hw->period_bytes_min, hw->period_bytes_max);
1989 if (err < 0)
1990 return err;
1991
1992 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1993 hw->periods_min, hw->periods_max);
1994 if (err < 0)
1995 return err;
1996
1997 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1998 hw->period_bytes_min, hw->buffer_bytes_max);
1999 if (err < 0)
2000 return err;
2001
2002 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2003 snd_pcm_hw_rule_buffer_bytes_max, substream,
2004 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2005 if (err < 0)
2006 return err;
2007
2008 /* FIXME: remove */
2009 if (runtime->dma_bytes) {
2010 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2011 if (err < 0)
2012 return err;
2013 }
2014
2015 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2016 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2017 snd_pcm_hw_rule_rate, hw,
2018 SNDRV_PCM_HW_PARAM_RATE, -1);
2019 if (err < 0)
2020 return err;
2021 }
2022
2023 /* FIXME: this belong to lowlevel */
2024 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2025
2026 return 0;
2027 }
2028
2029 static void pcm_release_private(struct snd_pcm_substream *substream)
2030 {
2031 snd_pcm_unlink(substream);
2032 }
2033
2034 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2035 {
2036 substream->ref_count--;
2037 if (substream->ref_count > 0)
2038 return;
2039
2040 snd_pcm_drop(substream);
2041 if (substream->hw_opened) {
2042 if (substream->ops->hw_free != NULL)
2043 substream->ops->hw_free(substream);
2044 substream->ops->close(substream);
2045 substream->hw_opened = 0;
2046 }
2047 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2048 pm_qos_remove_request(&substream->latency_pm_qos_req);
2049 if (substream->pcm_release) {
2050 substream->pcm_release(substream);
2051 substream->pcm_release = NULL;
2052 }
2053 snd_pcm_detach_substream(substream);
2054 }
2055
2056 EXPORT_SYMBOL(snd_pcm_release_substream);
2057
2058 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2059 struct file *file,
2060 struct snd_pcm_substream **rsubstream)
2061 {
2062 struct snd_pcm_substream *substream;
2063 int err;
2064
2065 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2066 if (err < 0)
2067 return err;
2068 if (substream->ref_count > 1) {
2069 *rsubstream = substream;
2070 return 0;
2071 }
2072
2073 err = snd_pcm_hw_constraints_init(substream);
2074 if (err < 0) {
2075 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2076 goto error;
2077 }
2078
2079 if ((err = substream->ops->open(substream)) < 0)
2080 goto error;
2081
2082 substream->hw_opened = 1;
2083
2084 err = snd_pcm_hw_constraints_complete(substream);
2085 if (err < 0) {
2086 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2087 goto error;
2088 }
2089
2090 *rsubstream = substream;
2091 return 0;
2092
2093 error:
2094 snd_pcm_release_substream(substream);
2095 return err;
2096 }
2097
2098 EXPORT_SYMBOL(snd_pcm_open_substream);
2099
2100 static int snd_pcm_open_file(struct file *file,
2101 struct snd_pcm *pcm,
2102 int stream)
2103 {
2104 struct snd_pcm_file *pcm_file;
2105 struct snd_pcm_substream *substream;
2106 int err;
2107
2108 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2109 if (err < 0)
2110 return err;
2111
2112 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2113 if (pcm_file == NULL) {
2114 snd_pcm_release_substream(substream);
2115 return -ENOMEM;
2116 }
2117 pcm_file->substream = substream;
2118 if (substream->ref_count == 1) {
2119 substream->file = pcm_file;
2120 substream->pcm_release = pcm_release_private;
2121 }
2122 file->private_data = pcm_file;
2123
2124 return 0;
2125 }
2126
2127 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2128 {
2129 struct snd_pcm *pcm;
2130 int err = nonseekable_open(inode, file);
2131 if (err < 0)
2132 return err;
2133 pcm = snd_lookup_minor_data(iminor(inode),
2134 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2135 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2136 if (pcm)
2137 snd_card_unref(pcm->card);
2138 return err;
2139 }
2140
2141 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2142 {
2143 struct snd_pcm *pcm;
2144 int err = nonseekable_open(inode, file);
2145 if (err < 0)
2146 return err;
2147 pcm = snd_lookup_minor_data(iminor(inode),
2148 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2149 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2150 if (pcm)
2151 snd_card_unref(pcm->card);
2152 return err;
2153 }
2154
2155 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2156 {
2157 int err;
2158 wait_queue_t wait;
2159
2160 if (pcm == NULL) {
2161 err = -ENODEV;
2162 goto __error1;
2163 }
2164 err = snd_card_file_add(pcm->card, file);
2165 if (err < 0)
2166 goto __error1;
2167 if (!try_module_get(pcm->card->module)) {
2168 err = -EFAULT;
2169 goto __error2;
2170 }
2171 init_waitqueue_entry(&wait, current);
2172 add_wait_queue(&pcm->open_wait, &wait);
2173 mutex_lock(&pcm->open_mutex);
2174 while (1) {
2175 err = snd_pcm_open_file(file, pcm, stream);
2176 if (err >= 0)
2177 break;
2178 if (err == -EAGAIN) {
2179 if (file->f_flags & O_NONBLOCK) {
2180 err = -EBUSY;
2181 break;
2182 }
2183 } else
2184 break;
2185 set_current_state(TASK_INTERRUPTIBLE);
2186 mutex_unlock(&pcm->open_mutex);
2187 schedule();
2188 mutex_lock(&pcm->open_mutex);
2189 if (pcm->card->shutdown) {
2190 err = -ENODEV;
2191 break;
2192 }
2193 if (signal_pending(current)) {
2194 err = -ERESTARTSYS;
2195 break;
2196 }
2197 }
2198 remove_wait_queue(&pcm->open_wait, &wait);
2199 mutex_unlock(&pcm->open_mutex);
2200 if (err < 0)
2201 goto __error;
2202 return err;
2203
2204 __error:
2205 module_put(pcm->card->module);
2206 __error2:
2207 snd_card_file_remove(pcm->card, file);
2208 __error1:
2209 return err;
2210 }
2211
2212 static int snd_pcm_release(struct inode *inode, struct file *file)
2213 {
2214 struct snd_pcm *pcm;
2215 struct snd_pcm_substream *substream;
2216 struct snd_pcm_file *pcm_file;
2217
2218 pcm_file = file->private_data;
2219 substream = pcm_file->substream;
2220 if (snd_BUG_ON(!substream))
2221 return -ENXIO;
2222 pcm = substream->pcm;
2223 mutex_lock(&pcm->open_mutex);
2224 snd_pcm_release_substream(substream);
2225 kfree(pcm_file);
2226 mutex_unlock(&pcm->open_mutex);
2227 wake_up(&pcm->open_wait);
2228 module_put(pcm->card->module);
2229 snd_card_file_remove(pcm->card, file);
2230 return 0;
2231 }
2232
2233 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2234 snd_pcm_uframes_t frames)
2235 {
2236 struct snd_pcm_runtime *runtime = substream->runtime;
2237 snd_pcm_sframes_t appl_ptr;
2238 snd_pcm_sframes_t ret;
2239 snd_pcm_sframes_t hw_avail;
2240
2241 if (frames == 0)
2242 return 0;
2243
2244 snd_pcm_stream_lock_irq(substream);
2245 switch (runtime->status->state) {
2246 case SNDRV_PCM_STATE_PREPARED:
2247 break;
2248 case SNDRV_PCM_STATE_DRAINING:
2249 case SNDRV_PCM_STATE_RUNNING:
2250 if (snd_pcm_update_hw_ptr(substream) >= 0)
2251 break;
2252 /* Fall through */
2253 case SNDRV_PCM_STATE_XRUN:
2254 ret = -EPIPE;
2255 goto __end;
2256 case SNDRV_PCM_STATE_SUSPENDED:
2257 ret = -ESTRPIPE;
2258 goto __end;
2259 default:
2260 ret = -EBADFD;
2261 goto __end;
2262 }
2263
2264 hw_avail = snd_pcm_playback_hw_avail(runtime);
2265 if (hw_avail <= 0) {
2266 ret = 0;
2267 goto __end;
2268 }
2269 if (frames > (snd_pcm_uframes_t)hw_avail)
2270 frames = hw_avail;
2271 appl_ptr = runtime->control->appl_ptr - frames;
2272 if (appl_ptr < 0)
2273 appl_ptr += runtime->boundary;
2274 runtime->control->appl_ptr = appl_ptr;
2275 ret = frames;
2276 __end:
2277 snd_pcm_stream_unlock_irq(substream);
2278 return ret;
2279 }
2280
2281 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2282 snd_pcm_uframes_t frames)
2283 {
2284 struct snd_pcm_runtime *runtime = substream->runtime;
2285 snd_pcm_sframes_t appl_ptr;
2286 snd_pcm_sframes_t ret;
2287 snd_pcm_sframes_t hw_avail;
2288
2289 if (frames == 0)
2290 return 0;
2291
2292 snd_pcm_stream_lock_irq(substream);
2293 switch (runtime->status->state) {
2294 case SNDRV_PCM_STATE_PREPARED:
2295 case SNDRV_PCM_STATE_DRAINING:
2296 break;
2297 case SNDRV_PCM_STATE_RUNNING:
2298 if (snd_pcm_update_hw_ptr(substream) >= 0)
2299 break;
2300 /* Fall through */
2301 case SNDRV_PCM_STATE_XRUN:
2302 ret = -EPIPE;
2303 goto __end;
2304 case SNDRV_PCM_STATE_SUSPENDED:
2305 ret = -ESTRPIPE;
2306 goto __end;
2307 default:
2308 ret = -EBADFD;
2309 goto __end;
2310 }
2311
2312 hw_avail = snd_pcm_capture_hw_avail(runtime);
2313 if (hw_avail <= 0) {
2314 ret = 0;
2315 goto __end;
2316 }
2317 if (frames > (snd_pcm_uframes_t)hw_avail)
2318 frames = hw_avail;
2319 appl_ptr = runtime->control->appl_ptr - frames;
2320 if (appl_ptr < 0)
2321 appl_ptr += runtime->boundary;
2322 runtime->control->appl_ptr = appl_ptr;
2323 ret = frames;
2324 __end:
2325 snd_pcm_stream_unlock_irq(substream);
2326 return ret;
2327 }
2328
2329 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2330 snd_pcm_uframes_t frames)
2331 {
2332 struct snd_pcm_runtime *runtime = substream->runtime;
2333 snd_pcm_sframes_t appl_ptr;
2334 snd_pcm_sframes_t ret;
2335 snd_pcm_sframes_t avail;
2336
2337 if (frames == 0)
2338 return 0;
2339
2340 snd_pcm_stream_lock_irq(substream);
2341 switch (runtime->status->state) {
2342 case SNDRV_PCM_STATE_PREPARED:
2343 case SNDRV_PCM_STATE_PAUSED:
2344 break;
2345 case SNDRV_PCM_STATE_DRAINING:
2346 case SNDRV_PCM_STATE_RUNNING:
2347 if (snd_pcm_update_hw_ptr(substream) >= 0)
2348 break;
2349 /* Fall through */
2350 case SNDRV_PCM_STATE_XRUN:
2351 ret = -EPIPE;
2352 goto __end;
2353 case SNDRV_PCM_STATE_SUSPENDED:
2354 ret = -ESTRPIPE;
2355 goto __end;
2356 default:
2357 ret = -EBADFD;
2358 goto __end;
2359 }
2360
2361 avail = snd_pcm_playback_avail(runtime);
2362 if (avail <= 0) {
2363 ret = 0;
2364 goto __end;
2365 }
2366 if (frames > (snd_pcm_uframes_t)avail)
2367 frames = avail;
2368 appl_ptr = runtime->control->appl_ptr + frames;
2369 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2370 appl_ptr -= runtime->boundary;
2371 runtime->control->appl_ptr = appl_ptr;
2372 ret = frames;
2373 __end:
2374 snd_pcm_stream_unlock_irq(substream);
2375 return ret;
2376 }
2377
2378 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2379 snd_pcm_uframes_t frames)
2380 {
2381 struct snd_pcm_runtime *runtime = substream->runtime;
2382 snd_pcm_sframes_t appl_ptr;
2383 snd_pcm_sframes_t ret;
2384 snd_pcm_sframes_t avail;
2385
2386 if (frames == 0)
2387 return 0;
2388
2389 snd_pcm_stream_lock_irq(substream);
2390 switch (runtime->status->state) {
2391 case SNDRV_PCM_STATE_PREPARED:
2392 case SNDRV_PCM_STATE_DRAINING:
2393 case SNDRV_PCM_STATE_PAUSED:
2394 break;
2395 case SNDRV_PCM_STATE_RUNNING:
2396 if (snd_pcm_update_hw_ptr(substream) >= 0)
2397 break;
2398 /* Fall through */
2399 case SNDRV_PCM_STATE_XRUN:
2400 ret = -EPIPE;
2401 goto __end;
2402 case SNDRV_PCM_STATE_SUSPENDED:
2403 ret = -ESTRPIPE;
2404 goto __end;
2405 default:
2406 ret = -EBADFD;
2407 goto __end;
2408 }
2409
2410 avail = snd_pcm_capture_avail(runtime);
2411 if (avail <= 0) {
2412 ret = 0;
2413 goto __end;
2414 }
2415 if (frames > (snd_pcm_uframes_t)avail)
2416 frames = avail;
2417 appl_ptr = runtime->control->appl_ptr + frames;
2418 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2419 appl_ptr -= runtime->boundary;
2420 runtime->control->appl_ptr = appl_ptr;
2421 ret = frames;
2422 __end:
2423 snd_pcm_stream_unlock_irq(substream);
2424 return ret;
2425 }
2426
2427 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2428 {
2429 struct snd_pcm_runtime *runtime = substream->runtime;
2430 int err;
2431
2432 snd_pcm_stream_lock_irq(substream);
2433 switch (runtime->status->state) {
2434 case SNDRV_PCM_STATE_DRAINING:
2435 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2436 goto __badfd;
2437 /* Fall through */
2438 case SNDRV_PCM_STATE_RUNNING:
2439 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2440 break;
2441 /* Fall through */
2442 case SNDRV_PCM_STATE_PREPARED:
2443 case SNDRV_PCM_STATE_SUSPENDED:
2444 err = 0;
2445 break;
2446 case SNDRV_PCM_STATE_XRUN:
2447 err = -EPIPE;
2448 break;
2449 default:
2450 __badfd:
2451 err = -EBADFD;
2452 break;
2453 }
2454 snd_pcm_stream_unlock_irq(substream);
2455 return err;
2456 }
2457
2458 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2459 snd_pcm_sframes_t __user *res)
2460 {
2461 struct snd_pcm_runtime *runtime = substream->runtime;
2462 int err;
2463 snd_pcm_sframes_t n = 0;
2464
2465 snd_pcm_stream_lock_irq(substream);
2466 switch (runtime->status->state) {
2467 case SNDRV_PCM_STATE_DRAINING:
2468 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2469 goto __badfd;
2470 /* Fall through */
2471 case SNDRV_PCM_STATE_RUNNING:
2472 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2473 break;
2474 /* Fall through */
2475 case SNDRV_PCM_STATE_PREPARED:
2476 case SNDRV_PCM_STATE_SUSPENDED:
2477 err = 0;
2478 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2479 n = snd_pcm_playback_hw_avail(runtime);
2480 else
2481 n = snd_pcm_capture_avail(runtime);
2482 n += runtime->delay;
2483 break;
2484 case SNDRV_PCM_STATE_XRUN:
2485 err = -EPIPE;
2486 break;
2487 default:
2488 __badfd:
2489 err = -EBADFD;
2490 break;
2491 }
2492 snd_pcm_stream_unlock_irq(substream);
2493 if (!err)
2494 if (put_user(n, res))
2495 err = -EFAULT;
2496 return err;
2497 }
2498
2499 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2500 struct snd_pcm_sync_ptr __user *_sync_ptr)
2501 {
2502 struct snd_pcm_runtime *runtime = substream->runtime;
2503 struct snd_pcm_sync_ptr sync_ptr;
2504 volatile struct snd_pcm_mmap_status *status;
2505 volatile struct snd_pcm_mmap_control *control;
2506 int err;
2507
2508 memset(&sync_ptr, 0, sizeof(sync_ptr));
2509 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2510 return -EFAULT;
2511 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2512 return -EFAULT;
2513 status = runtime->status;
2514 control = runtime->control;
2515 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2516 err = snd_pcm_hwsync(substream);
2517 if (err < 0)
2518 return err;
2519 }
2520 snd_pcm_stream_lock_irq(substream);
2521 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2522 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2523 else
2524 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2525 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2526 control->avail_min = sync_ptr.c.control.avail_min;
2527 else
2528 sync_ptr.c.control.avail_min = control->avail_min;
2529 sync_ptr.s.status.state = status->state;
2530 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2531 sync_ptr.s.status.tstamp = status->tstamp;
2532 sync_ptr.s.status.suspended_state = status->suspended_state;
2533 snd_pcm_stream_unlock_irq(substream);
2534 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2535 return -EFAULT;
2536 return 0;
2537 }
2538
2539 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2540 {
2541 struct snd_pcm_runtime *runtime = substream->runtime;
2542 int arg;
2543
2544 if (get_user(arg, _arg))
2545 return -EFAULT;
2546 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2547 return -EINVAL;
2548 runtime->tstamp_type = arg;
2549 return 0;
2550 }
2551
2552 static int snd_pcm_common_ioctl1(struct file *file,
2553 struct snd_pcm_substream *substream,
2554 unsigned int cmd, void __user *arg)
2555 {
2556 switch (cmd) {
2557 case SNDRV_PCM_IOCTL_PVERSION:
2558 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2559 case SNDRV_PCM_IOCTL_INFO:
2560 return snd_pcm_info_user(substream, arg);
2561 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2562 return 0;
2563 case SNDRV_PCM_IOCTL_TTSTAMP:
2564 return snd_pcm_tstamp(substream, arg);
2565 case SNDRV_PCM_IOCTL_HW_REFINE:
2566 return snd_pcm_hw_refine_user(substream, arg);
2567 case SNDRV_PCM_IOCTL_HW_PARAMS:
2568 return snd_pcm_hw_params_user(substream, arg);
2569 case SNDRV_PCM_IOCTL_HW_FREE:
2570 return snd_pcm_hw_free(substream);
2571 case SNDRV_PCM_IOCTL_SW_PARAMS:
2572 return snd_pcm_sw_params_user(substream, arg);
2573 case SNDRV_PCM_IOCTL_STATUS:
2574 return snd_pcm_status_user(substream, arg);
2575 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2576 return snd_pcm_channel_info_user(substream, arg);
2577 case SNDRV_PCM_IOCTL_PREPARE:
2578 return snd_pcm_prepare(substream, file);
2579 case SNDRV_PCM_IOCTL_RESET:
2580 return snd_pcm_reset(substream);
2581 case SNDRV_PCM_IOCTL_START:
2582 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2583 case SNDRV_PCM_IOCTL_LINK:
2584 return snd_pcm_link(substream, (int)(unsigned long) arg);
2585 case SNDRV_PCM_IOCTL_UNLINK:
2586 return snd_pcm_unlink(substream);
2587 case SNDRV_PCM_IOCTL_RESUME:
2588 return snd_pcm_resume(substream);
2589 case SNDRV_PCM_IOCTL_XRUN:
2590 return snd_pcm_xrun(substream);
2591 case SNDRV_PCM_IOCTL_HWSYNC:
2592 return snd_pcm_hwsync(substream);
2593 case SNDRV_PCM_IOCTL_DELAY:
2594 return snd_pcm_delay(substream, arg);
2595 case SNDRV_PCM_IOCTL_SYNC_PTR:
2596 return snd_pcm_sync_ptr(substream, arg);
2597 #ifdef CONFIG_SND_SUPPORT_OLD_API
2598 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2599 return snd_pcm_hw_refine_old_user(substream, arg);
2600 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2601 return snd_pcm_hw_params_old_user(substream, arg);
2602 #endif
2603 case SNDRV_PCM_IOCTL_DRAIN:
2604 return snd_pcm_drain(substream, file);
2605 case SNDRV_PCM_IOCTL_DROP:
2606 return snd_pcm_drop(substream);
2607 case SNDRV_PCM_IOCTL_PAUSE:
2608 {
2609 int res;
2610 snd_pcm_stream_lock_irq(substream);
2611 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2612 snd_pcm_stream_unlock_irq(substream);
2613 return res;
2614 }
2615 }
2616 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2617 return -ENOTTY;
2618 }
2619
2620 static int snd_pcm_playback_ioctl1(struct file *file,
2621 struct snd_pcm_substream *substream,
2622 unsigned int cmd, void __user *arg)
2623 {
2624 if (snd_BUG_ON(!substream))
2625 return -ENXIO;
2626 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2627 return -EINVAL;
2628 switch (cmd) {
2629 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2630 {
2631 struct snd_xferi xferi;
2632 struct snd_xferi __user *_xferi = arg;
2633 struct snd_pcm_runtime *runtime = substream->runtime;
2634 snd_pcm_sframes_t result;
2635 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2636 return -EBADFD;
2637 if (put_user(0, &_xferi->result))
2638 return -EFAULT;
2639 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2640 return -EFAULT;
2641 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2642 __put_user(result, &_xferi->result);
2643 return result < 0 ? result : 0;
2644 }
2645 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2646 {
2647 struct snd_xfern xfern;
2648 struct snd_xfern __user *_xfern = arg;
2649 struct snd_pcm_runtime *runtime = substream->runtime;
2650 void __user **bufs;
2651 snd_pcm_sframes_t result;
2652 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2653 return -EBADFD;
2654 if (runtime->channels > 128)
2655 return -EINVAL;
2656 if (put_user(0, &_xfern->result))
2657 return -EFAULT;
2658 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2659 return -EFAULT;
2660
2661 bufs = memdup_user(xfern.bufs,
2662 sizeof(void *) * runtime->channels);
2663 if (IS_ERR(bufs))
2664 return PTR_ERR(bufs);
2665 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2666 kfree(bufs);
2667 __put_user(result, &_xfern->result);
2668 return result < 0 ? result : 0;
2669 }
2670 case SNDRV_PCM_IOCTL_REWIND:
2671 {
2672 snd_pcm_uframes_t frames;
2673 snd_pcm_uframes_t __user *_frames = arg;
2674 snd_pcm_sframes_t result;
2675 if (get_user(frames, _frames))
2676 return -EFAULT;
2677 if (put_user(0, _frames))
2678 return -EFAULT;
2679 result = snd_pcm_playback_rewind(substream, frames);
2680 __put_user(result, _frames);
2681 return result < 0 ? result : 0;
2682 }
2683 case SNDRV_PCM_IOCTL_FORWARD:
2684 {
2685 snd_pcm_uframes_t frames;
2686 snd_pcm_uframes_t __user *_frames = arg;
2687 snd_pcm_sframes_t result;
2688 if (get_user(frames, _frames))
2689 return -EFAULT;
2690 if (put_user(0, _frames))
2691 return -EFAULT;
2692 result = snd_pcm_playback_forward(substream, frames);
2693 __put_user(result, _frames);
2694 return result < 0 ? result : 0;
2695 }
2696 }
2697 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2698 }
2699
2700 static int snd_pcm_capture_ioctl1(struct file *file,
2701 struct snd_pcm_substream *substream,
2702 unsigned int cmd, void __user *arg)
2703 {
2704 if (snd_BUG_ON(!substream))
2705 return -ENXIO;
2706 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2707 return -EINVAL;
2708 switch (cmd) {
2709 case SNDRV_PCM_IOCTL_READI_FRAMES:
2710 {
2711 struct snd_xferi xferi;
2712 struct snd_xferi __user *_xferi = arg;
2713 struct snd_pcm_runtime *runtime = substream->runtime;
2714 snd_pcm_sframes_t result;
2715 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2716 return -EBADFD;
2717 if (put_user(0, &_xferi->result))
2718 return -EFAULT;
2719 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2720 return -EFAULT;
2721 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2722 __put_user(result, &_xferi->result);
2723 return result < 0 ? result : 0;
2724 }
2725 case SNDRV_PCM_IOCTL_READN_FRAMES:
2726 {
2727 struct snd_xfern xfern;
2728 struct snd_xfern __user *_xfern = arg;
2729 struct snd_pcm_runtime *runtime = substream->runtime;
2730 void *bufs;
2731 snd_pcm_sframes_t result;
2732 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2733 return -EBADFD;
2734 if (runtime->channels > 128)
2735 return -EINVAL;
2736 if (put_user(0, &_xfern->result))
2737 return -EFAULT;
2738 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2739 return -EFAULT;
2740
2741 bufs = memdup_user(xfern.bufs,
2742 sizeof(void *) * runtime->channels);
2743 if (IS_ERR(bufs))
2744 return PTR_ERR(bufs);
2745 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2746 kfree(bufs);
2747 __put_user(result, &_xfern->result);
2748 return result < 0 ? result : 0;
2749 }
2750 case SNDRV_PCM_IOCTL_REWIND:
2751 {
2752 snd_pcm_uframes_t frames;
2753 snd_pcm_uframes_t __user *_frames = arg;
2754 snd_pcm_sframes_t result;
2755 if (get_user(frames, _frames))
2756 return -EFAULT;
2757 if (put_user(0, _frames))
2758 return -EFAULT;
2759 result = snd_pcm_capture_rewind(substream, frames);
2760 __put_user(result, _frames);
2761 return result < 0 ? result : 0;
2762 }
2763 case SNDRV_PCM_IOCTL_FORWARD:
2764 {
2765 snd_pcm_uframes_t frames;
2766 snd_pcm_uframes_t __user *_frames = arg;
2767 snd_pcm_sframes_t result;
2768 if (get_user(frames, _frames))
2769 return -EFAULT;
2770 if (put_user(0, _frames))
2771 return -EFAULT;
2772 result = snd_pcm_capture_forward(substream, frames);
2773 __put_user(result, _frames);
2774 return result < 0 ? result : 0;
2775 }
2776 }
2777 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2778 }
2779
2780 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2781 unsigned long arg)
2782 {
2783 struct snd_pcm_file *pcm_file;
2784
2785 pcm_file = file->private_data;
2786
2787 if (((cmd >> 8) & 0xff) != 'A')
2788 return -ENOTTY;
2789
2790 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2791 (void __user *)arg);
2792 }
2793
2794 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2795 unsigned long arg)
2796 {
2797 struct snd_pcm_file *pcm_file;
2798
2799 pcm_file = file->private_data;
2800
2801 if (((cmd >> 8) & 0xff) != 'A')
2802 return -ENOTTY;
2803
2804 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2805 (void __user *)arg);
2806 }
2807
2808 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2809 unsigned int cmd, void *arg)
2810 {
2811 mm_segment_t fs;
2812 int result;
2813
2814 fs = snd_enter_user();
2815 switch (substream->stream) {
2816 case SNDRV_PCM_STREAM_PLAYBACK:
2817 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2818 (void __user *)arg);
2819 break;
2820 case SNDRV_PCM_STREAM_CAPTURE:
2821 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2822 (void __user *)arg);
2823 break;
2824 default:
2825 result = -EINVAL;
2826 break;
2827 }
2828 snd_leave_user(fs);
2829 return result;
2830 }
2831
2832 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2833
2834 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2835 loff_t * offset)
2836 {
2837 struct snd_pcm_file *pcm_file;
2838 struct snd_pcm_substream *substream;
2839 struct snd_pcm_runtime *runtime;
2840 snd_pcm_sframes_t result;
2841
2842 pcm_file = file->private_data;
2843 substream = pcm_file->substream;
2844 if (PCM_RUNTIME_CHECK(substream))
2845 return -ENXIO;
2846 runtime = substream->runtime;
2847 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2848 return -EBADFD;
2849 if (!frame_aligned(runtime, count))
2850 return -EINVAL;
2851 count = bytes_to_frames(runtime, count);
2852 result = snd_pcm_lib_read(substream, buf, count);
2853 if (result > 0)
2854 result = frames_to_bytes(runtime, result);
2855 return result;
2856 }
2857
2858 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2859 size_t count, loff_t * offset)
2860 {
2861 struct snd_pcm_file *pcm_file;
2862 struct snd_pcm_substream *substream;
2863 struct snd_pcm_runtime *runtime;
2864 snd_pcm_sframes_t result;
2865
2866 pcm_file = file->private_data;
2867 substream = pcm_file->substream;
2868 if (PCM_RUNTIME_CHECK(substream))
2869 return -ENXIO;
2870 runtime = substream->runtime;
2871 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2872 return -EBADFD;
2873 if (!frame_aligned(runtime, count))
2874 return -EINVAL;
2875 count = bytes_to_frames(runtime, count);
2876 result = snd_pcm_lib_write(substream, buf, count);
2877 if (result > 0)
2878 result = frames_to_bytes(runtime, result);
2879 return result;
2880 }
2881
2882 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2883 unsigned long nr_segs, loff_t pos)
2884
2885 {
2886 struct snd_pcm_file *pcm_file;
2887 struct snd_pcm_substream *substream;
2888 struct snd_pcm_runtime *runtime;
2889 snd_pcm_sframes_t result;
2890 unsigned long i;
2891 void __user **bufs;
2892 snd_pcm_uframes_t frames;
2893
2894 pcm_file = iocb->ki_filp->private_data;
2895 substream = pcm_file->substream;
2896 if (PCM_RUNTIME_CHECK(substream))
2897 return -ENXIO;
2898 runtime = substream->runtime;
2899 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2900 return -EBADFD;
2901 if (nr_segs > 1024 || nr_segs != runtime->channels)
2902 return -EINVAL;
2903 if (!frame_aligned(runtime, iov->iov_len))
2904 return -EINVAL;
2905 frames = bytes_to_samples(runtime, iov->iov_len);
2906 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2907 if (bufs == NULL)
2908 return -ENOMEM;
2909 for (i = 0; i < nr_segs; ++i)
2910 bufs[i] = iov[i].iov_base;
2911 result = snd_pcm_lib_readv(substream, bufs, frames);
2912 if (result > 0)
2913 result = frames_to_bytes(runtime, result);
2914 kfree(bufs);
2915 return result;
2916 }
2917
2918 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2919 unsigned long nr_segs, loff_t pos)
2920 {
2921 struct snd_pcm_file *pcm_file;
2922 struct snd_pcm_substream *substream;
2923 struct snd_pcm_runtime *runtime;
2924 snd_pcm_sframes_t result;
2925 unsigned long i;
2926 void __user **bufs;
2927 snd_pcm_uframes_t frames;
2928
2929 pcm_file = iocb->ki_filp->private_data;
2930 substream = pcm_file->substream;
2931 if (PCM_RUNTIME_CHECK(substream))
2932 return -ENXIO;
2933 runtime = substream->runtime;
2934 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2935 return -EBADFD;
2936 if (nr_segs > 128 || nr_segs != runtime->channels ||
2937 !frame_aligned(runtime, iov->iov_len))
2938 return -EINVAL;
2939 frames = bytes_to_samples(runtime, iov->iov_len);
2940 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2941 if (bufs == NULL)
2942 return -ENOMEM;
2943 for (i = 0; i < nr_segs; ++i)
2944 bufs[i] = iov[i].iov_base;
2945 result = snd_pcm_lib_writev(substream, bufs, frames);
2946 if (result > 0)
2947 result = frames_to_bytes(runtime, result);
2948 kfree(bufs);
2949 return result;
2950 }
2951
2952 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2953 {
2954 struct snd_pcm_file *pcm_file;
2955 struct snd_pcm_substream *substream;
2956 struct snd_pcm_runtime *runtime;
2957 unsigned int mask;
2958 snd_pcm_uframes_t avail;
2959
2960 pcm_file = file->private_data;
2961
2962 substream = pcm_file->substream;
2963 if (PCM_RUNTIME_CHECK(substream))
2964 return -ENXIO;
2965 runtime = substream->runtime;
2966
2967 poll_wait(file, &runtime->sleep, wait);
2968
2969 snd_pcm_stream_lock_irq(substream);
2970 avail = snd_pcm_playback_avail(runtime);
2971 switch (runtime->status->state) {
2972 case SNDRV_PCM_STATE_RUNNING:
2973 case SNDRV_PCM_STATE_PREPARED:
2974 case SNDRV_PCM_STATE_PAUSED:
2975 if (avail >= runtime->control->avail_min) {
2976 mask = POLLOUT | POLLWRNORM;
2977 break;
2978 }
2979 /* Fall through */
2980 case SNDRV_PCM_STATE_DRAINING:
2981 mask = 0;
2982 break;
2983 default:
2984 mask = POLLOUT | POLLWRNORM | POLLERR;
2985 break;
2986 }
2987 snd_pcm_stream_unlock_irq(substream);
2988 return mask;
2989 }
2990
2991 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2992 {
2993 struct snd_pcm_file *pcm_file;
2994 struct snd_pcm_substream *substream;
2995 struct snd_pcm_runtime *runtime;
2996 unsigned int mask;
2997 snd_pcm_uframes_t avail;
2998
2999 pcm_file = file->private_data;
3000
3001 substream = pcm_file->substream;
3002 if (PCM_RUNTIME_CHECK(substream))
3003 return -ENXIO;
3004 runtime = substream->runtime;
3005
3006 poll_wait(file, &runtime->sleep, wait);
3007
3008 snd_pcm_stream_lock_irq(substream);
3009 avail = snd_pcm_capture_avail(runtime);
3010 switch (runtime->status->state) {
3011 case SNDRV_PCM_STATE_RUNNING:
3012 case SNDRV_PCM_STATE_PREPARED:
3013 case SNDRV_PCM_STATE_PAUSED:
3014 if (avail >= runtime->control->avail_min) {
3015 mask = POLLIN | POLLRDNORM;
3016 break;
3017 }
3018 mask = 0;
3019 break;
3020 case SNDRV_PCM_STATE_DRAINING:
3021 if (avail > 0) {
3022 mask = POLLIN | POLLRDNORM;
3023 break;
3024 }
3025 /* Fall through */
3026 default:
3027 mask = POLLIN | POLLRDNORM | POLLERR;
3028 break;
3029 }
3030 snd_pcm_stream_unlock_irq(substream);
3031 return mask;
3032 }
3033
3034 /*
3035 * mmap support
3036 */
3037
3038 /*
3039 * Only on coherent architectures, we can mmap the status and the control records
3040 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3041 */
3042 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3043 /*
3044 * mmap status record
3045 */
3046 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3047 struct vm_fault *vmf)
3048 {
3049 struct snd_pcm_substream *substream = area->vm_private_data;
3050 struct snd_pcm_runtime *runtime;
3051
3052 if (substream == NULL)
3053 return VM_FAULT_SIGBUS;
3054 runtime = substream->runtime;
3055 vmf->page = virt_to_page(runtime->status);
3056 get_page(vmf->page);
3057 return 0;
3058 }
3059
3060 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3061 {
3062 .fault = snd_pcm_mmap_status_fault,
3063 };
3064
3065 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3066 struct vm_area_struct *area)
3067 {
3068 long size;
3069 if (!(area->vm_flags & VM_READ))
3070 return -EINVAL;
3071 size = area->vm_end - area->vm_start;
3072 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3073 return -EINVAL;
3074 area->vm_ops = &snd_pcm_vm_ops_status;
3075 area->vm_private_data = substream;
3076 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3077 return 0;
3078 }
3079
3080 /*
3081 * mmap control record
3082 */
3083 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3084 struct vm_fault *vmf)
3085 {
3086 struct snd_pcm_substream *substream = area->vm_private_data;
3087 struct snd_pcm_runtime *runtime;
3088
3089 if (substream == NULL)
3090 return VM_FAULT_SIGBUS;
3091 runtime = substream->runtime;
3092 vmf->page = virt_to_page(runtime->control);
3093 get_page(vmf->page);
3094 return 0;
3095 }
3096
3097 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3098 {
3099 .fault = snd_pcm_mmap_control_fault,
3100 };
3101
3102 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3103 struct vm_area_struct *area)
3104 {
3105 long size;
3106 if (!(area->vm_flags & VM_READ))
3107 return -EINVAL;
3108 size = area->vm_end - area->vm_start;
3109 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3110 return -EINVAL;
3111 area->vm_ops = &snd_pcm_vm_ops_control;
3112 area->vm_private_data = substream;
3113 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3114 return 0;
3115 }
3116 #else /* ! coherent mmap */
3117 /*
3118 * don't support mmap for status and control records.
3119 */
3120 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3121 struct vm_area_struct *area)
3122 {
3123 return -ENXIO;
3124 }
3125 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3126 struct vm_area_struct *area)
3127 {
3128 return -ENXIO;
3129 }
3130 #endif /* coherent mmap */
3131
3132 static inline struct page *
3133 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3134 {
3135 void *vaddr = substream->runtime->dma_area + ofs;
3136 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3137 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3138 return virt_to_page(CAC_ADDR(vaddr));
3139 #endif
3140 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3141 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3142 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3143 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3144 /* assume dma_handle set via pfn_to_phys() in
3145 * mm/dma-noncoherent.c
3146 */
3147 return pfn_to_page(addr >> PAGE_SHIFT);
3148 }
3149 #endif
3150 return virt_to_page(vaddr);
3151 }
3152
3153 /*
3154 * fault callback for mmapping a RAM page
3155 */
3156 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3157 struct vm_fault *vmf)
3158 {
3159 struct snd_pcm_substream *substream = area->vm_private_data;
3160 struct snd_pcm_runtime *runtime;
3161 unsigned long offset;
3162 struct page * page;
3163 size_t dma_bytes;
3164
3165 if (substream == NULL)
3166 return VM_FAULT_SIGBUS;
3167 runtime = substream->runtime;
3168 offset = vmf->pgoff << PAGE_SHIFT;
3169 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3170 if (offset > dma_bytes - PAGE_SIZE)
3171 return VM_FAULT_SIGBUS;
3172 if (substream->ops->page)
3173 page = substream->ops->page(substream, offset);
3174 else
3175 page = snd_pcm_default_page_ops(substream, offset);
3176 if (!page)
3177 return VM_FAULT_SIGBUS;
3178 get_page(page);
3179 vmf->page = page;
3180 return 0;
3181 }
3182
3183 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3184 .open = snd_pcm_mmap_data_open,
3185 .close = snd_pcm_mmap_data_close,
3186 };
3187
3188 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3189 .open = snd_pcm_mmap_data_open,
3190 .close = snd_pcm_mmap_data_close,
3191 .fault = snd_pcm_mmap_data_fault,
3192 };
3193
3194 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3195 /* This should be defined / handled globally! */
3196 #ifdef CONFIG_ARM
3197 #define ARCH_HAS_DMA_MMAP_COHERENT
3198 #endif
3199 #endif
3200
3201 /*
3202 * mmap the DMA buffer on RAM
3203 */
3204 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3205 struct vm_area_struct *area)
3206 {
3207 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3208 #ifdef CONFIG_GENERIC_ALLOCATOR
3209 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3210 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3211 return remap_pfn_range(area, area->vm_start,
3212 substream->dma_buffer.addr >> PAGE_SHIFT,
3213 area->vm_end - area->vm_start, area->vm_page_prot);
3214 }
3215 #endif /* CONFIG_GENERIC_ALLOCATOR */
3216 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3217 if (!substream->ops->page &&
3218 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3219 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3220 area,
3221 substream->runtime->dma_area,
3222 substream->runtime->dma_addr,
3223 area->vm_end - area->vm_start);
3224 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3225 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3226 !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3227 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3228 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3229 /* mmap with fault handler */
3230 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3231 return 0;
3232 }
3233 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3234
3235 /*
3236 * mmap the DMA buffer on I/O memory area
3237 */
3238 #if SNDRV_PCM_INFO_MMAP_IOMEM
3239 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3240 struct vm_area_struct *area)
3241 {
3242 struct snd_pcm_runtime *runtime = substream->runtime;;
3243
3244 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3245 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3246 }
3247
3248 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3249 #endif /* SNDRV_PCM_INFO_MMAP */
3250
3251 /*
3252 * mmap DMA buffer
3253 */
3254 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3255 struct vm_area_struct *area)
3256 {
3257 struct snd_pcm_runtime *runtime;
3258 long size;
3259 unsigned long offset;
3260 size_t dma_bytes;
3261 int err;
3262
3263 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3264 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3265 return -EINVAL;
3266 } else {
3267 if (!(area->vm_flags & VM_READ))
3268 return -EINVAL;
3269 }
3270 runtime = substream->runtime;
3271 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3272 return -EBADFD;
3273 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3274 return -ENXIO;
3275 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3276 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3277 return -EINVAL;
3278 size = area->vm_end - area->vm_start;
3279 offset = area->vm_pgoff << PAGE_SHIFT;
3280 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3281 if ((size_t)size > dma_bytes)
3282 return -EINVAL;
3283 if (offset > dma_bytes - size)
3284 return -EINVAL;
3285
3286 area->vm_ops = &snd_pcm_vm_ops_data;
3287 area->vm_private_data = substream;
3288 if (substream->ops->mmap)
3289 err = substream->ops->mmap(substream, area);
3290 else
3291 err = snd_pcm_lib_default_mmap(substream, area);
3292 if (!err)
3293 atomic_inc(&substream->mmap_count);
3294 return err;
3295 }
3296
3297 EXPORT_SYMBOL(snd_pcm_mmap_data);
3298
3299 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3300 {
3301 struct snd_pcm_file * pcm_file;
3302 struct snd_pcm_substream *substream;
3303 unsigned long offset;
3304
3305 pcm_file = file->private_data;
3306 substream = pcm_file->substream;
3307 if (PCM_RUNTIME_CHECK(substream))
3308 return -ENXIO;
3309
3310 offset = area->vm_pgoff << PAGE_SHIFT;
3311 switch (offset) {
3312 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3313 if (pcm_file->no_compat_mmap)
3314 return -ENXIO;
3315 return snd_pcm_mmap_status(substream, file, area);
3316 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3317 if (pcm_file->no_compat_mmap)
3318 return -ENXIO;
3319 return snd_pcm_mmap_control(substream, file, area);
3320 default:
3321 return snd_pcm_mmap_data(substream, file, area);
3322 }
3323 return 0;
3324 }
3325
3326 static int snd_pcm_fasync(int fd, struct file * file, int on)
3327 {
3328 struct snd_pcm_file * pcm_file;
3329 struct snd_pcm_substream *substream;
3330 struct snd_pcm_runtime *runtime;
3331
3332 pcm_file = file->private_data;
3333 substream = pcm_file->substream;
3334 if (PCM_RUNTIME_CHECK(substream))
3335 return -ENXIO;
3336 runtime = substream->runtime;
3337 return fasync_helper(fd, file, on, &runtime->fasync);
3338 }
3339
3340 /*
3341 * ioctl32 compat
3342 */
3343 #ifdef CONFIG_COMPAT
3344 #include "pcm_compat.c"
3345 #else
3346 #define snd_pcm_ioctl_compat NULL
3347 #endif
3348
3349 /*
3350 * To be removed helpers to keep binary compatibility
3351 */
3352
3353 #ifdef CONFIG_SND_SUPPORT_OLD_API
3354 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3355 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3356
3357 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3358 struct snd_pcm_hw_params_old *oparams)
3359 {
3360 unsigned int i;
3361
3362 memset(params, 0, sizeof(*params));
3363 params->flags = oparams->flags;
3364 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3365 params->masks[i].bits[0] = oparams->masks[i];
3366 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3367 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3368 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3369 params->info = oparams->info;
3370 params->msbits = oparams->msbits;
3371 params->rate_num = oparams->rate_num;
3372 params->rate_den = oparams->rate_den;
3373 params->fifo_size = oparams->fifo_size;
3374 }
3375
3376 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3377 struct snd_pcm_hw_params *params)
3378 {
3379 unsigned int i;
3380
3381 memset(oparams, 0, sizeof(*oparams));
3382 oparams->flags = params->flags;
3383 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3384 oparams->masks[i] = params->masks[i].bits[0];
3385 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3386 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3387 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3388 oparams->info = params->info;
3389 oparams->msbits = params->msbits;
3390 oparams->rate_num = params->rate_num;
3391 oparams->rate_den = params->rate_den;
3392 oparams->fifo_size = params->fifo_size;
3393 }
3394
3395 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3396 struct snd_pcm_hw_params_old __user * _oparams)
3397 {
3398 struct snd_pcm_hw_params *params;
3399 struct snd_pcm_hw_params_old *oparams = NULL;
3400 int err;
3401
3402 params = kmalloc(sizeof(*params), GFP_KERNEL);
3403 if (!params)
3404 return -ENOMEM;
3405
3406 oparams = memdup_user(_oparams, sizeof(*oparams));
3407 if (IS_ERR(oparams)) {
3408 err = PTR_ERR(oparams);
3409 goto out;
3410 }
3411 snd_pcm_hw_convert_from_old_params(params, oparams);
3412 err = snd_pcm_hw_refine(substream, params);
3413 snd_pcm_hw_convert_to_old_params(oparams, params);
3414 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3415 if (!err)
3416 err = -EFAULT;
3417 }
3418
3419 kfree(oparams);
3420 out:
3421 kfree(params);
3422 return err;
3423 }
3424
3425 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3426 struct snd_pcm_hw_params_old __user * _oparams)
3427 {
3428 struct snd_pcm_hw_params *params;
3429 struct snd_pcm_hw_params_old *oparams = NULL;
3430 int err;
3431
3432 params = kmalloc(sizeof(*params), GFP_KERNEL);
3433 if (!params)
3434 return -ENOMEM;
3435
3436 oparams = memdup_user(_oparams, sizeof(*oparams));
3437 if (IS_ERR(oparams)) {
3438 err = PTR_ERR(oparams);
3439 goto out;
3440 }
3441 snd_pcm_hw_convert_from_old_params(params, oparams);
3442 err = snd_pcm_hw_params(substream, params);
3443 snd_pcm_hw_convert_to_old_params(oparams, params);
3444 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3445 if (!err)
3446 err = -EFAULT;
3447 }
3448
3449 kfree(oparams);
3450 out:
3451 kfree(params);
3452 return err;
3453 }
3454 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3455
3456 #ifndef CONFIG_MMU
3457 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3458 unsigned long addr,
3459 unsigned long len,
3460 unsigned long pgoff,
3461 unsigned long flags)
3462 {
3463 struct snd_pcm_file *pcm_file = file->private_data;
3464 struct snd_pcm_substream *substream = pcm_file->substream;
3465 struct snd_pcm_runtime *runtime = substream->runtime;
3466 unsigned long offset = pgoff << PAGE_SHIFT;
3467
3468 switch (offset) {
3469 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3470 return (unsigned long)runtime->status;
3471 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3472 return (unsigned long)runtime->control;
3473 default:
3474 return (unsigned long)runtime->dma_area + offset;
3475 }
3476 }
3477 #else
3478 # define snd_pcm_get_unmapped_area NULL
3479 #endif
3480
3481 /*
3482 * Register section
3483 */
3484
3485 const struct file_operations snd_pcm_f_ops[2] = {
3486 {
3487 .owner = THIS_MODULE,
3488 .write = snd_pcm_write,
3489 .aio_write = snd_pcm_aio_write,
3490 .open = snd_pcm_playback_open,
3491 .release = snd_pcm_release,
3492 .llseek = no_llseek,
3493 .poll = snd_pcm_playback_poll,
3494 .unlocked_ioctl = snd_pcm_playback_ioctl,
3495 .compat_ioctl = snd_pcm_ioctl_compat,
3496 .mmap = snd_pcm_mmap,
3497 .fasync = snd_pcm_fasync,
3498 .get_unmapped_area = snd_pcm_get_unmapped_area,
3499 },
3500 {
3501 .owner = THIS_MODULE,
3502 .read = snd_pcm_read,
3503 .aio_read = snd_pcm_aio_read,
3504 .open = snd_pcm_capture_open,
3505 .release = snd_pcm_release,
3506 .llseek = no_llseek,
3507 .poll = snd_pcm_capture_poll,
3508 .unlocked_ioctl = snd_pcm_capture_ioctl,
3509 .compat_ioctl = snd_pcm_ioctl_compat,
3510 .mmap = snd_pcm_mmap,
3511 .fasync = snd_pcm_fasync,
3512 .get_unmapped_area = snd_pcm_get_unmapped_area,
3513 }
3514 };
Linux kernel - Deliverables
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