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ALSA: pcm_lib - return back hw_ptr_interrupt
[mirror_ubuntu-artful-kernel.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/file.h>
24 #include <linux/slab.h>
25 #include <linux/smp_lock.h>
26 #include <linux/time.h>
27 #include <linux/pm_qos_params.h>
28 #include <linux/uio.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
39 /*
40 * Compatibility
41 */
42
43 struct snd_pcm_hw_params_old {
44 unsigned int flags;
45 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
46 SNDRV_PCM_HW_PARAM_ACCESS + 1];
47 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
48 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
49 unsigned int rmask;
50 unsigned int cmask;
51 unsigned int info;
52 unsigned int msbits;
53 unsigned int rate_num;
54 unsigned int rate_den;
55 snd_pcm_uframes_t fifo_size;
56 unsigned char reserved[64];
57 };
58
59 #ifdef CONFIG_SND_SUPPORT_OLD_API
60 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
61 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
62
63 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
64 struct snd_pcm_hw_params_old __user * _oparams);
65 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
66 struct snd_pcm_hw_params_old __user * _oparams);
67 #endif
68 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
69
70 /*
71 *
72 */
73
74 DEFINE_RWLOCK(snd_pcm_link_rwlock);
75 EXPORT_SYMBOL(snd_pcm_link_rwlock);
76
77 static DECLARE_RWSEM(snd_pcm_link_rwsem);
78
79 static inline mm_segment_t snd_enter_user(void)
80 {
81 mm_segment_t fs = get_fs();
82 set_fs(get_ds());
83 return fs;
84 }
85
86 static inline void snd_leave_user(mm_segment_t fs)
87 {
88 set_fs(fs);
89 }
90
91
92
93 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
94 {
95 struct snd_pcm_runtime *runtime;
96 struct snd_pcm *pcm = substream->pcm;
97 struct snd_pcm_str *pstr = substream->pstr;
98
99 memset(info, 0, sizeof(*info));
100 info->card = pcm->card->number;
101 info->device = pcm->device;
102 info->stream = substream->stream;
103 info->subdevice = substream->number;
104 strlcpy(info->id, pcm->id, sizeof(info->id));
105 strlcpy(info->name, pcm->name, sizeof(info->name));
106 info->dev_class = pcm->dev_class;
107 info->dev_subclass = pcm->dev_subclass;
108 info->subdevices_count = pstr->substream_count;
109 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
110 strlcpy(info->subname, substream->name, sizeof(info->subname));
111 runtime = substream->runtime;
112 /* AB: FIXME!!! This is definitely nonsense */
113 if (runtime) {
114 info->sync = runtime->sync;
115 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
116 }
117 return 0;
118 }
119
120 int snd_pcm_info_user(struct snd_pcm_substream *substream,
121 struct snd_pcm_info __user * _info)
122 {
123 struct snd_pcm_info *info;
124 int err;
125
126 info = kmalloc(sizeof(*info), GFP_KERNEL);
127 if (! info)
128 return -ENOMEM;
129 err = snd_pcm_info(substream, info);
130 if (err >= 0) {
131 if (copy_to_user(_info, info, sizeof(*info)))
132 err = -EFAULT;
133 }
134 kfree(info);
135 return err;
136 }
137
138 #undef RULES_DEBUG
139
140 #ifdef RULES_DEBUG
141 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
142 char *snd_pcm_hw_param_names[] = {
143 HW_PARAM(ACCESS),
144 HW_PARAM(FORMAT),
145 HW_PARAM(SUBFORMAT),
146 HW_PARAM(SAMPLE_BITS),
147 HW_PARAM(FRAME_BITS),
148 HW_PARAM(CHANNELS),
149 HW_PARAM(RATE),
150 HW_PARAM(PERIOD_TIME),
151 HW_PARAM(PERIOD_SIZE),
152 HW_PARAM(PERIOD_BYTES),
153 HW_PARAM(PERIODS),
154 HW_PARAM(BUFFER_TIME),
155 HW_PARAM(BUFFER_SIZE),
156 HW_PARAM(BUFFER_BYTES),
157 HW_PARAM(TICK_TIME),
158 };
159 #endif
160
161 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
162 struct snd_pcm_hw_params *params)
163 {
164 unsigned int k;
165 struct snd_pcm_hardware *hw;
166 struct snd_interval *i = NULL;
167 struct snd_mask *m = NULL;
168 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
169 unsigned int rstamps[constrs->rules_num];
170 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
171 unsigned int stamp = 2;
172 int changed, again;
173
174 params->info = 0;
175 params->fifo_size = 0;
176 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
177 params->msbits = 0;
178 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
179 params->rate_num = 0;
180 params->rate_den = 0;
181 }
182
183 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
184 m = hw_param_mask(params, k);
185 if (snd_mask_empty(m))
186 return -EINVAL;
187 if (!(params->rmask & (1 << k)))
188 continue;
189 #ifdef RULES_DEBUG
190 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
191 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
192 #endif
193 changed = snd_mask_refine(m, constrs_mask(constrs, k));
194 #ifdef RULES_DEBUG
195 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
196 #endif
197 if (changed)
198 params->cmask |= 1 << k;
199 if (changed < 0)
200 return changed;
201 }
202
203 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
204 i = hw_param_interval(params, k);
205 if (snd_interval_empty(i))
206 return -EINVAL;
207 if (!(params->rmask & (1 << k)))
208 continue;
209 #ifdef RULES_DEBUG
210 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
211 if (i->empty)
212 printk("empty");
213 else
214 printk("%c%u %u%c",
215 i->openmin ? '(' : '[', i->min,
216 i->max, i->openmax ? ')' : ']');
217 printk(" -> ");
218 #endif
219 changed = snd_interval_refine(i, constrs_interval(constrs, k));
220 #ifdef RULES_DEBUG
221 if (i->empty)
222 printk("empty\n");
223 else
224 printk("%c%u %u%c\n",
225 i->openmin ? '(' : '[', i->min,
226 i->max, i->openmax ? ')' : ']');
227 #endif
228 if (changed)
229 params->cmask |= 1 << k;
230 if (changed < 0)
231 return changed;
232 }
233
234 for (k = 0; k < constrs->rules_num; k++)
235 rstamps[k] = 0;
236 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
237 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
238 do {
239 again = 0;
240 for (k = 0; k < constrs->rules_num; k++) {
241 struct snd_pcm_hw_rule *r = &constrs->rules[k];
242 unsigned int d;
243 int doit = 0;
244 if (r->cond && !(r->cond & params->flags))
245 continue;
246 for (d = 0; r->deps[d] >= 0; d++) {
247 if (vstamps[r->deps[d]] > rstamps[k]) {
248 doit = 1;
249 break;
250 }
251 }
252 if (!doit)
253 continue;
254 #ifdef RULES_DEBUG
255 printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
256 if (r->var >= 0) {
257 printk("%s = ", snd_pcm_hw_param_names[r->var]);
258 if (hw_is_mask(r->var)) {
259 m = hw_param_mask(params, r->var);
260 printk("%x", *m->bits);
261 } else {
262 i = hw_param_interval(params, r->var);
263 if (i->empty)
264 printk("empty");
265 else
266 printk("%c%u %u%c",
267 i->openmin ? '(' : '[', i->min,
268 i->max, i->openmax ? ')' : ']');
269 }
270 }
271 #endif
272 changed = r->func(params, r);
273 #ifdef RULES_DEBUG
274 if (r->var >= 0) {
275 printk(" -> ");
276 if (hw_is_mask(r->var))
277 printk("%x", *m->bits);
278 else {
279 if (i->empty)
280 printk("empty");
281 else
282 printk("%c%u %u%c",
283 i->openmin ? '(' : '[', i->min,
284 i->max, i->openmax ? ')' : ']');
285 }
286 }
287 printk("\n");
288 #endif
289 rstamps[k] = stamp;
290 if (changed && r->var >= 0) {
291 params->cmask |= (1 << r->var);
292 vstamps[r->var] = stamp;
293 again = 1;
294 }
295 if (changed < 0)
296 return changed;
297 stamp++;
298 }
299 } while (again);
300 if (!params->msbits) {
301 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
302 if (snd_interval_single(i))
303 params->msbits = snd_interval_value(i);
304 }
305
306 if (!params->rate_den) {
307 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
308 if (snd_interval_single(i)) {
309 params->rate_num = snd_interval_value(i);
310 params->rate_den = 1;
311 }
312 }
313
314 hw = &substream->runtime->hw;
315 if (!params->info)
316 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
317 if (!params->fifo_size) {
318 if (snd_mask_min(&params->masks[SNDRV_PCM_HW_PARAM_FORMAT]) ==
319 snd_mask_max(&params->masks[SNDRV_PCM_HW_PARAM_FORMAT]) &&
320 snd_mask_min(&params->masks[SNDRV_PCM_HW_PARAM_CHANNELS]) ==
321 snd_mask_max(&params->masks[SNDRV_PCM_HW_PARAM_CHANNELS])) {
322 changed = substream->ops->ioctl(substream,
323 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
324 if (changed < 0)
325 return changed;
326 }
327 }
328 params->rmask = 0;
329 return 0;
330 }
331
332 EXPORT_SYMBOL(snd_pcm_hw_refine);
333
334 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
335 struct snd_pcm_hw_params __user * _params)
336 {
337 struct snd_pcm_hw_params *params;
338 int err;
339
340 params = memdup_user(_params, sizeof(*params));
341 if (IS_ERR(params))
342 return PTR_ERR(params);
343
344 err = snd_pcm_hw_refine(substream, params);
345 if (copy_to_user(_params, params, sizeof(*params))) {
346 if (!err)
347 err = -EFAULT;
348 }
349
350 kfree(params);
351 return err;
352 }
353
354 static int period_to_usecs(struct snd_pcm_runtime *runtime)
355 {
356 int usecs;
357
358 if (! runtime->rate)
359 return -1; /* invalid */
360
361 /* take 75% of period time as the deadline */
362 usecs = (750000 / runtime->rate) * runtime->period_size;
363 usecs += ((750000 % runtime->rate) * runtime->period_size) /
364 runtime->rate;
365
366 return usecs;
367 }
368
369 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
370 struct snd_pcm_hw_params *params)
371 {
372 struct snd_pcm_runtime *runtime;
373 int err, usecs;
374 unsigned int bits;
375 snd_pcm_uframes_t frames;
376
377 if (PCM_RUNTIME_CHECK(substream))
378 return -ENXIO;
379 runtime = substream->runtime;
380 snd_pcm_stream_lock_irq(substream);
381 switch (runtime->status->state) {
382 case SNDRV_PCM_STATE_OPEN:
383 case SNDRV_PCM_STATE_SETUP:
384 case SNDRV_PCM_STATE_PREPARED:
385 break;
386 default:
387 snd_pcm_stream_unlock_irq(substream);
388 return -EBADFD;
389 }
390 snd_pcm_stream_unlock_irq(substream);
391 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
392 if (!substream->oss.oss)
393 #endif
394 if (atomic_read(&substream->mmap_count))
395 return -EBADFD;
396
397 params->rmask = ~0U;
398 err = snd_pcm_hw_refine(substream, params);
399 if (err < 0)
400 goto _error;
401
402 err = snd_pcm_hw_params_choose(substream, params);
403 if (err < 0)
404 goto _error;
405
406 if (substream->ops->hw_params != NULL) {
407 err = substream->ops->hw_params(substream, params);
408 if (err < 0)
409 goto _error;
410 }
411
412 runtime->access = params_access(params);
413 runtime->format = params_format(params);
414 runtime->subformat = params_subformat(params);
415 runtime->channels = params_channels(params);
416 runtime->rate = params_rate(params);
417 runtime->period_size = params_period_size(params);
418 runtime->periods = params_periods(params);
419 runtime->buffer_size = params_buffer_size(params);
420 runtime->info = params->info;
421 runtime->rate_num = params->rate_num;
422 runtime->rate_den = params->rate_den;
423
424 bits = snd_pcm_format_physical_width(runtime->format);
425 runtime->sample_bits = bits;
426 bits *= runtime->channels;
427 runtime->frame_bits = bits;
428 frames = 1;
429 while (bits % 8 != 0) {
430 bits *= 2;
431 frames *= 2;
432 }
433 runtime->byte_align = bits / 8;
434 runtime->min_align = frames;
435
436 /* Default sw params */
437 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
438 runtime->period_step = 1;
439 runtime->control->avail_min = runtime->period_size;
440 runtime->start_threshold = 1;
441 runtime->stop_threshold = runtime->buffer_size;
442 runtime->silence_threshold = 0;
443 runtime->silence_size = 0;
444 runtime->boundary = runtime->buffer_size;
445 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
446 runtime->boundary *= 2;
447
448 snd_pcm_timer_resolution_change(substream);
449 runtime->status->state = SNDRV_PCM_STATE_SETUP;
450
451 pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
452 substream->latency_id);
453 if ((usecs = period_to_usecs(runtime)) >= 0)
454 pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY,
455 substream->latency_id, usecs);
456 return 0;
457 _error:
458 /* hardware might be unuseable from this time,
459 so we force application to retry to set
460 the correct hardware parameter settings */
461 runtime->status->state = SNDRV_PCM_STATE_OPEN;
462 if (substream->ops->hw_free != NULL)
463 substream->ops->hw_free(substream);
464 return err;
465 }
466
467 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
468 struct snd_pcm_hw_params __user * _params)
469 {
470 struct snd_pcm_hw_params *params;
471 int err;
472
473 params = memdup_user(_params, sizeof(*params));
474 if (IS_ERR(params))
475 return PTR_ERR(params);
476
477 err = snd_pcm_hw_params(substream, params);
478 if (copy_to_user(_params, params, sizeof(*params))) {
479 if (!err)
480 err = -EFAULT;
481 }
482
483 kfree(params);
484 return err;
485 }
486
487 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
488 {
489 struct snd_pcm_runtime *runtime;
490 int result = 0;
491
492 if (PCM_RUNTIME_CHECK(substream))
493 return -ENXIO;
494 runtime = substream->runtime;
495 snd_pcm_stream_lock_irq(substream);
496 switch (runtime->status->state) {
497 case SNDRV_PCM_STATE_SETUP:
498 case SNDRV_PCM_STATE_PREPARED:
499 break;
500 default:
501 snd_pcm_stream_unlock_irq(substream);
502 return -EBADFD;
503 }
504 snd_pcm_stream_unlock_irq(substream);
505 if (atomic_read(&substream->mmap_count))
506 return -EBADFD;
507 if (substream->ops->hw_free)
508 result = substream->ops->hw_free(substream);
509 runtime->status->state = SNDRV_PCM_STATE_OPEN;
510 pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
511 substream->latency_id);
512 return result;
513 }
514
515 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
516 struct snd_pcm_sw_params *params)
517 {
518 struct snd_pcm_runtime *runtime;
519 int err;
520
521 if (PCM_RUNTIME_CHECK(substream))
522 return -ENXIO;
523 runtime = substream->runtime;
524 snd_pcm_stream_lock_irq(substream);
525 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
526 snd_pcm_stream_unlock_irq(substream);
527 return -EBADFD;
528 }
529 snd_pcm_stream_unlock_irq(substream);
530
531 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
532 return -EINVAL;
533 if (params->avail_min == 0)
534 return -EINVAL;
535 if (params->silence_size >= runtime->boundary) {
536 if (params->silence_threshold != 0)
537 return -EINVAL;
538 } else {
539 if (params->silence_size > params->silence_threshold)
540 return -EINVAL;
541 if (params->silence_threshold > runtime->buffer_size)
542 return -EINVAL;
543 }
544 err = 0;
545 snd_pcm_stream_lock_irq(substream);
546 runtime->tstamp_mode = params->tstamp_mode;
547 runtime->period_step = params->period_step;
548 runtime->control->avail_min = params->avail_min;
549 runtime->start_threshold = params->start_threshold;
550 runtime->stop_threshold = params->stop_threshold;
551 runtime->silence_threshold = params->silence_threshold;
552 runtime->silence_size = params->silence_size;
553 params->boundary = runtime->boundary;
554 if (snd_pcm_running(substream)) {
555 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
556 runtime->silence_size > 0)
557 snd_pcm_playback_silence(substream, ULONG_MAX);
558 err = snd_pcm_update_state(substream, runtime);
559 }
560 snd_pcm_stream_unlock_irq(substream);
561 return err;
562 }
563
564 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
565 struct snd_pcm_sw_params __user * _params)
566 {
567 struct snd_pcm_sw_params params;
568 int err;
569 if (copy_from_user(&params, _params, sizeof(params)))
570 return -EFAULT;
571 err = snd_pcm_sw_params(substream, &params);
572 if (copy_to_user(_params, &params, sizeof(params)))
573 return -EFAULT;
574 return err;
575 }
576
577 int snd_pcm_status(struct snd_pcm_substream *substream,
578 struct snd_pcm_status *status)
579 {
580 struct snd_pcm_runtime *runtime = substream->runtime;
581
582 snd_pcm_stream_lock_irq(substream);
583 status->state = runtime->status->state;
584 status->suspended_state = runtime->status->suspended_state;
585 if (status->state == SNDRV_PCM_STATE_OPEN)
586 goto _end;
587 status->trigger_tstamp = runtime->trigger_tstamp;
588 if (snd_pcm_running(substream)) {
589 snd_pcm_update_hw_ptr(substream);
590 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
591 status->tstamp = runtime->status->tstamp;
592 goto _tstamp_end;
593 }
594 }
595 snd_pcm_gettime(runtime, &status->tstamp);
596 _tstamp_end:
597 status->appl_ptr = runtime->control->appl_ptr;
598 status->hw_ptr = runtime->status->hw_ptr;
599 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
600 status->avail = snd_pcm_playback_avail(runtime);
601 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
602 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
603 status->delay = runtime->buffer_size - status->avail;
604 status->delay += runtime->delay;
605 } else
606 status->delay = 0;
607 } else {
608 status->avail = snd_pcm_capture_avail(runtime);
609 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
610 status->delay = status->avail + runtime->delay;
611 else
612 status->delay = 0;
613 }
614 status->avail_max = runtime->avail_max;
615 status->overrange = runtime->overrange;
616 runtime->avail_max = 0;
617 runtime->overrange = 0;
618 _end:
619 snd_pcm_stream_unlock_irq(substream);
620 return 0;
621 }
622
623 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
624 struct snd_pcm_status __user * _status)
625 {
626 struct snd_pcm_status status;
627 int res;
628
629 memset(&status, 0, sizeof(status));
630 res = snd_pcm_status(substream, &status);
631 if (res < 0)
632 return res;
633 if (copy_to_user(_status, &status, sizeof(status)))
634 return -EFAULT;
635 return 0;
636 }
637
638 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
639 struct snd_pcm_channel_info * info)
640 {
641 struct snd_pcm_runtime *runtime;
642 unsigned int channel;
643
644 channel = info->channel;
645 runtime = substream->runtime;
646 snd_pcm_stream_lock_irq(substream);
647 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
648 snd_pcm_stream_unlock_irq(substream);
649 return -EBADFD;
650 }
651 snd_pcm_stream_unlock_irq(substream);
652 if (channel >= runtime->channels)
653 return -EINVAL;
654 memset(info, 0, sizeof(*info));
655 info->channel = channel;
656 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
657 }
658
659 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
660 struct snd_pcm_channel_info __user * _info)
661 {
662 struct snd_pcm_channel_info info;
663 int res;
664
665 if (copy_from_user(&info, _info, sizeof(info)))
666 return -EFAULT;
667 res = snd_pcm_channel_info(substream, &info);
668 if (res < 0)
669 return res;
670 if (copy_to_user(_info, &info, sizeof(info)))
671 return -EFAULT;
672 return 0;
673 }
674
675 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
676 {
677 struct snd_pcm_runtime *runtime = substream->runtime;
678 if (runtime->trigger_master == NULL)
679 return;
680 if (runtime->trigger_master == substream) {
681 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
682 } else {
683 snd_pcm_trigger_tstamp(runtime->trigger_master);
684 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
685 }
686 runtime->trigger_master = NULL;
687 }
688
689 struct action_ops {
690 int (*pre_action)(struct snd_pcm_substream *substream, int state);
691 int (*do_action)(struct snd_pcm_substream *substream, int state);
692 void (*undo_action)(struct snd_pcm_substream *substream, int state);
693 void (*post_action)(struct snd_pcm_substream *substream, int state);
694 };
695
696 /*
697 * this functions is core for handling of linked stream
698 * Note: the stream state might be changed also on failure
699 * Note2: call with calling stream lock + link lock
700 */
701 static int snd_pcm_action_group(struct action_ops *ops,
702 struct snd_pcm_substream *substream,
703 int state, int do_lock)
704 {
705 struct snd_pcm_substream *s = NULL;
706 struct snd_pcm_substream *s1;
707 int res = 0;
708
709 snd_pcm_group_for_each_entry(s, substream) {
710 if (do_lock && s != substream)
711 spin_lock_nested(&s->self_group.lock,
712 SINGLE_DEPTH_NESTING);
713 res = ops->pre_action(s, state);
714 if (res < 0)
715 goto _unlock;
716 }
717 snd_pcm_group_for_each_entry(s, substream) {
718 res = ops->do_action(s, state);
719 if (res < 0) {
720 if (ops->undo_action) {
721 snd_pcm_group_for_each_entry(s1, substream) {
722 if (s1 == s) /* failed stream */
723 break;
724 ops->undo_action(s1, state);
725 }
726 }
727 s = NULL; /* unlock all */
728 goto _unlock;
729 }
730 }
731 snd_pcm_group_for_each_entry(s, substream) {
732 ops->post_action(s, state);
733 }
734 _unlock:
735 if (do_lock) {
736 /* unlock streams */
737 snd_pcm_group_for_each_entry(s1, substream) {
738 if (s1 != substream)
739 spin_unlock(&s1->self_group.lock);
740 if (s1 == s) /* end */
741 break;
742 }
743 }
744 return res;
745 }
746
747 /*
748 * Note: call with stream lock
749 */
750 static int snd_pcm_action_single(struct action_ops *ops,
751 struct snd_pcm_substream *substream,
752 int state)
753 {
754 int res;
755
756 res = ops->pre_action(substream, state);
757 if (res < 0)
758 return res;
759 res = ops->do_action(substream, state);
760 if (res == 0)
761 ops->post_action(substream, state);
762 else if (ops->undo_action)
763 ops->undo_action(substream, state);
764 return res;
765 }
766
767 /*
768 * Note: call with stream lock
769 */
770 static int snd_pcm_action(struct action_ops *ops,
771 struct snd_pcm_substream *substream,
772 int state)
773 {
774 int res;
775
776 if (snd_pcm_stream_linked(substream)) {
777 if (!spin_trylock(&substream->group->lock)) {
778 spin_unlock(&substream->self_group.lock);
779 spin_lock(&substream->group->lock);
780 spin_lock(&substream->self_group.lock);
781 }
782 res = snd_pcm_action_group(ops, substream, state, 1);
783 spin_unlock(&substream->group->lock);
784 } else {
785 res = snd_pcm_action_single(ops, substream, state);
786 }
787 return res;
788 }
789
790 /*
791 * Note: don't use any locks before
792 */
793 static int snd_pcm_action_lock_irq(struct action_ops *ops,
794 struct snd_pcm_substream *substream,
795 int state)
796 {
797 int res;
798
799 read_lock_irq(&snd_pcm_link_rwlock);
800 if (snd_pcm_stream_linked(substream)) {
801 spin_lock(&substream->group->lock);
802 spin_lock(&substream->self_group.lock);
803 res = snd_pcm_action_group(ops, substream, state, 1);
804 spin_unlock(&substream->self_group.lock);
805 spin_unlock(&substream->group->lock);
806 } else {
807 spin_lock(&substream->self_group.lock);
808 res = snd_pcm_action_single(ops, substream, state);
809 spin_unlock(&substream->self_group.lock);
810 }
811 read_unlock_irq(&snd_pcm_link_rwlock);
812 return res;
813 }
814
815 /*
816 */
817 static int snd_pcm_action_nonatomic(struct action_ops *ops,
818 struct snd_pcm_substream *substream,
819 int state)
820 {
821 int res;
822
823 down_read(&snd_pcm_link_rwsem);
824 if (snd_pcm_stream_linked(substream))
825 res = snd_pcm_action_group(ops, substream, state, 0);
826 else
827 res = snd_pcm_action_single(ops, substream, state);
828 up_read(&snd_pcm_link_rwsem);
829 return res;
830 }
831
832 /*
833 * start callbacks
834 */
835 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
836 {
837 struct snd_pcm_runtime *runtime = substream->runtime;
838 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
839 return -EBADFD;
840 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
841 !snd_pcm_playback_data(substream))
842 return -EPIPE;
843 runtime->trigger_master = substream;
844 return 0;
845 }
846
847 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
848 {
849 if (substream->runtime->trigger_master != substream)
850 return 0;
851 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
852 }
853
854 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
855 {
856 if (substream->runtime->trigger_master == substream)
857 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
858 }
859
860 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
861 {
862 struct snd_pcm_runtime *runtime = substream->runtime;
863 snd_pcm_trigger_tstamp(substream);
864 runtime->hw_ptr_jiffies = jiffies;
865 runtime->status->state = state;
866 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
867 runtime->silence_size > 0)
868 snd_pcm_playback_silence(substream, ULONG_MAX);
869 if (substream->timer)
870 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
871 &runtime->trigger_tstamp);
872 }
873
874 static struct action_ops snd_pcm_action_start = {
875 .pre_action = snd_pcm_pre_start,
876 .do_action = snd_pcm_do_start,
877 .undo_action = snd_pcm_undo_start,
878 .post_action = snd_pcm_post_start
879 };
880
881 /**
882 * snd_pcm_start - start all linked streams
883 * @substream: the PCM substream instance
884 */
885 int snd_pcm_start(struct snd_pcm_substream *substream)
886 {
887 return snd_pcm_action(&snd_pcm_action_start, substream,
888 SNDRV_PCM_STATE_RUNNING);
889 }
890
891 /*
892 * stop callbacks
893 */
894 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
895 {
896 struct snd_pcm_runtime *runtime = substream->runtime;
897 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
898 return -EBADFD;
899 runtime->trigger_master = substream;
900 return 0;
901 }
902
903 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
904 {
905 if (substream->runtime->trigger_master == substream &&
906 snd_pcm_running(substream))
907 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
908 return 0; /* unconditonally stop all substreams */
909 }
910
911 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
912 {
913 struct snd_pcm_runtime *runtime = substream->runtime;
914 if (runtime->status->state != state) {
915 snd_pcm_trigger_tstamp(substream);
916 if (substream->timer)
917 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
918 &runtime->trigger_tstamp);
919 runtime->status->state = state;
920 }
921 wake_up(&runtime->sleep);
922 wake_up(&runtime->tsleep);
923 }
924
925 static struct action_ops snd_pcm_action_stop = {
926 .pre_action = snd_pcm_pre_stop,
927 .do_action = snd_pcm_do_stop,
928 .post_action = snd_pcm_post_stop
929 };
930
931 /**
932 * snd_pcm_stop - try to stop all running streams in the substream group
933 * @substream: the PCM substream instance
934 * @state: PCM state after stopping the stream
935 *
936 * The state of each stream is then changed to the given state unconditionally.
937 */
938 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
939 {
940 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
941 }
942
943 EXPORT_SYMBOL(snd_pcm_stop);
944
945 /**
946 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
947 * @substream: the PCM substream
948 *
949 * After stopping, the state is changed to SETUP.
950 * Unlike snd_pcm_stop(), this affects only the given stream.
951 */
952 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
953 {
954 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
955 SNDRV_PCM_STATE_SETUP);
956 }
957
958 /*
959 * pause callbacks
960 */
961 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
962 {
963 struct snd_pcm_runtime *runtime = substream->runtime;
964 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
965 return -ENOSYS;
966 if (push) {
967 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
968 return -EBADFD;
969 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
970 return -EBADFD;
971 runtime->trigger_master = substream;
972 return 0;
973 }
974
975 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
976 {
977 if (substream->runtime->trigger_master != substream)
978 return 0;
979 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
980 * a delta betwen the current jiffies, this gives a large enough
981 * delta, effectively to skip the check once.
982 */
983 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
984 return substream->ops->trigger(substream,
985 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
986 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
987 }
988
989 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
990 {
991 if (substream->runtime->trigger_master == substream)
992 substream->ops->trigger(substream,
993 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
994 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
995 }
996
997 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
998 {
999 struct snd_pcm_runtime *runtime = substream->runtime;
1000 snd_pcm_trigger_tstamp(substream);
1001 if (push) {
1002 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1003 if (substream->timer)
1004 snd_timer_notify(substream->timer,
1005 SNDRV_TIMER_EVENT_MPAUSE,
1006 &runtime->trigger_tstamp);
1007 wake_up(&runtime->sleep);
1008 wake_up(&runtime->tsleep);
1009 } else {
1010 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1011 if (substream->timer)
1012 snd_timer_notify(substream->timer,
1013 SNDRV_TIMER_EVENT_MCONTINUE,
1014 &runtime->trigger_tstamp);
1015 }
1016 }
1017
1018 static struct action_ops snd_pcm_action_pause = {
1019 .pre_action = snd_pcm_pre_pause,
1020 .do_action = snd_pcm_do_pause,
1021 .undo_action = snd_pcm_undo_pause,
1022 .post_action = snd_pcm_post_pause
1023 };
1024
1025 /*
1026 * Push/release the pause for all linked streams.
1027 */
1028 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1029 {
1030 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1031 }
1032
1033 #ifdef CONFIG_PM
1034 /* suspend */
1035
1036 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1037 {
1038 struct snd_pcm_runtime *runtime = substream->runtime;
1039 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1040 return -EBUSY;
1041 runtime->trigger_master = substream;
1042 return 0;
1043 }
1044
1045 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1046 {
1047 struct snd_pcm_runtime *runtime = substream->runtime;
1048 if (runtime->trigger_master != substream)
1049 return 0;
1050 if (! snd_pcm_running(substream))
1051 return 0;
1052 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1053 return 0; /* suspend unconditionally */
1054 }
1055
1056 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1057 {
1058 struct snd_pcm_runtime *runtime = substream->runtime;
1059 snd_pcm_trigger_tstamp(substream);
1060 if (substream->timer)
1061 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1062 &runtime->trigger_tstamp);
1063 runtime->status->suspended_state = runtime->status->state;
1064 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1065 wake_up(&runtime->sleep);
1066 wake_up(&runtime->tsleep);
1067 }
1068
1069 static struct action_ops snd_pcm_action_suspend = {
1070 .pre_action = snd_pcm_pre_suspend,
1071 .do_action = snd_pcm_do_suspend,
1072 .post_action = snd_pcm_post_suspend
1073 };
1074
1075 /**
1076 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1077 * @substream: the PCM substream
1078 *
1079 * After this call, all streams are changed to SUSPENDED state.
1080 */
1081 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1082 {
1083 int err;
1084 unsigned long flags;
1085
1086 if (! substream)
1087 return 0;
1088
1089 snd_pcm_stream_lock_irqsave(substream, flags);
1090 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1091 snd_pcm_stream_unlock_irqrestore(substream, flags);
1092 return err;
1093 }
1094
1095 EXPORT_SYMBOL(snd_pcm_suspend);
1096
1097 /**
1098 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1099 * @pcm: the PCM instance
1100 *
1101 * After this call, all streams are changed to SUSPENDED state.
1102 */
1103 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1104 {
1105 struct snd_pcm_substream *substream;
1106 int stream, err = 0;
1107
1108 if (! pcm)
1109 return 0;
1110
1111 for (stream = 0; stream < 2; stream++) {
1112 for (substream = pcm->streams[stream].substream;
1113 substream; substream = substream->next) {
1114 /* FIXME: the open/close code should lock this as well */
1115 if (substream->runtime == NULL)
1116 continue;
1117 err = snd_pcm_suspend(substream);
1118 if (err < 0 && err != -EBUSY)
1119 return err;
1120 }
1121 }
1122 return 0;
1123 }
1124
1125 EXPORT_SYMBOL(snd_pcm_suspend_all);
1126
1127 /* resume */
1128
1129 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1130 {
1131 struct snd_pcm_runtime *runtime = substream->runtime;
1132 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1133 return -ENOSYS;
1134 runtime->trigger_master = substream;
1135 return 0;
1136 }
1137
1138 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1139 {
1140 struct snd_pcm_runtime *runtime = substream->runtime;
1141 if (runtime->trigger_master != substream)
1142 return 0;
1143 /* DMA not running previously? */
1144 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1145 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1146 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1147 return 0;
1148 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1149 }
1150
1151 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1152 {
1153 if (substream->runtime->trigger_master == substream &&
1154 snd_pcm_running(substream))
1155 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1156 }
1157
1158 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1159 {
1160 struct snd_pcm_runtime *runtime = substream->runtime;
1161 snd_pcm_trigger_tstamp(substream);
1162 if (substream->timer)
1163 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1164 &runtime->trigger_tstamp);
1165 runtime->status->state = runtime->status->suspended_state;
1166 }
1167
1168 static struct action_ops snd_pcm_action_resume = {
1169 .pre_action = snd_pcm_pre_resume,
1170 .do_action = snd_pcm_do_resume,
1171 .undo_action = snd_pcm_undo_resume,
1172 .post_action = snd_pcm_post_resume
1173 };
1174
1175 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1176 {
1177 struct snd_card *card = substream->pcm->card;
1178 int res;
1179
1180 snd_power_lock(card);
1181 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1182 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1183 snd_power_unlock(card);
1184 return res;
1185 }
1186
1187 #else
1188
1189 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1190 {
1191 return -ENOSYS;
1192 }
1193
1194 #endif /* CONFIG_PM */
1195
1196 /*
1197 * xrun ioctl
1198 *
1199 * Change the RUNNING stream(s) to XRUN state.
1200 */
1201 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1202 {
1203 struct snd_card *card = substream->pcm->card;
1204 struct snd_pcm_runtime *runtime = substream->runtime;
1205 int result;
1206
1207 snd_power_lock(card);
1208 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1209 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1210 if (result < 0)
1211 goto _unlock;
1212 }
1213
1214 snd_pcm_stream_lock_irq(substream);
1215 switch (runtime->status->state) {
1216 case SNDRV_PCM_STATE_XRUN:
1217 result = 0; /* already there */
1218 break;
1219 case SNDRV_PCM_STATE_RUNNING:
1220 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1221 break;
1222 default:
1223 result = -EBADFD;
1224 }
1225 snd_pcm_stream_unlock_irq(substream);
1226 _unlock:
1227 snd_power_unlock(card);
1228 return result;
1229 }
1230
1231 /*
1232 * reset ioctl
1233 */
1234 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1235 {
1236 struct snd_pcm_runtime *runtime = substream->runtime;
1237 switch (runtime->status->state) {
1238 case SNDRV_PCM_STATE_RUNNING:
1239 case SNDRV_PCM_STATE_PREPARED:
1240 case SNDRV_PCM_STATE_PAUSED:
1241 case SNDRV_PCM_STATE_SUSPENDED:
1242 return 0;
1243 default:
1244 return -EBADFD;
1245 }
1246 }
1247
1248 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1249 {
1250 struct snd_pcm_runtime *runtime = substream->runtime;
1251 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1252 if (err < 0)
1253 return err;
1254 runtime->hw_ptr_base = 0;
1255 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1256 runtime->status->hw_ptr % runtime->period_size;
1257 runtime->silence_start = runtime->status->hw_ptr;
1258 runtime->silence_filled = 0;
1259 return 0;
1260 }
1261
1262 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1263 {
1264 struct snd_pcm_runtime *runtime = substream->runtime;
1265 runtime->control->appl_ptr = runtime->status->hw_ptr;
1266 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1267 runtime->silence_size > 0)
1268 snd_pcm_playback_silence(substream, ULONG_MAX);
1269 }
1270
1271 static struct action_ops snd_pcm_action_reset = {
1272 .pre_action = snd_pcm_pre_reset,
1273 .do_action = snd_pcm_do_reset,
1274 .post_action = snd_pcm_post_reset
1275 };
1276
1277 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1278 {
1279 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1280 }
1281
1282 /*
1283 * prepare ioctl
1284 */
1285 /* we use the second argument for updating f_flags */
1286 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1287 int f_flags)
1288 {
1289 struct snd_pcm_runtime *runtime = substream->runtime;
1290 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1291 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1292 return -EBADFD;
1293 if (snd_pcm_running(substream))
1294 return -EBUSY;
1295 substream->f_flags = f_flags;
1296 return 0;
1297 }
1298
1299 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1300 {
1301 int err;
1302 err = substream->ops->prepare(substream);
1303 if (err < 0)
1304 return err;
1305 return snd_pcm_do_reset(substream, 0);
1306 }
1307
1308 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1309 {
1310 struct snd_pcm_runtime *runtime = substream->runtime;
1311 runtime->control->appl_ptr = runtime->status->hw_ptr;
1312 runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1313 }
1314
1315 static struct action_ops snd_pcm_action_prepare = {
1316 .pre_action = snd_pcm_pre_prepare,
1317 .do_action = snd_pcm_do_prepare,
1318 .post_action = snd_pcm_post_prepare
1319 };
1320
1321 /**
1322 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1323 * @substream: the PCM substream instance
1324 * @file: file to refer f_flags
1325 */
1326 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1327 struct file *file)
1328 {
1329 int res;
1330 struct snd_card *card = substream->pcm->card;
1331 int f_flags;
1332
1333 if (file)
1334 f_flags = file->f_flags;
1335 else
1336 f_flags = substream->f_flags;
1337
1338 snd_power_lock(card);
1339 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1340 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1341 substream, f_flags);
1342 snd_power_unlock(card);
1343 return res;
1344 }
1345
1346 /*
1347 * drain ioctl
1348 */
1349
1350 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1351 {
1352 substream->runtime->trigger_master = substream;
1353 return 0;
1354 }
1355
1356 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1357 {
1358 struct snd_pcm_runtime *runtime = substream->runtime;
1359 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1360 switch (runtime->status->state) {
1361 case SNDRV_PCM_STATE_PREPARED:
1362 /* start playback stream if possible */
1363 if (! snd_pcm_playback_empty(substream)) {
1364 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1365 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1366 }
1367 break;
1368 case SNDRV_PCM_STATE_RUNNING:
1369 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1370 break;
1371 default:
1372 break;
1373 }
1374 } else {
1375 /* stop running stream */
1376 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1377 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1378 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1379 snd_pcm_do_stop(substream, new_state);
1380 snd_pcm_post_stop(substream, new_state);
1381 }
1382 }
1383 return 0;
1384 }
1385
1386 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1387 {
1388 }
1389
1390 static struct action_ops snd_pcm_action_drain_init = {
1391 .pre_action = snd_pcm_pre_drain_init,
1392 .do_action = snd_pcm_do_drain_init,
1393 .post_action = snd_pcm_post_drain_init
1394 };
1395
1396 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1397
1398 /*
1399 * Drain the stream(s).
1400 * When the substream is linked, sync until the draining of all playback streams
1401 * is finished.
1402 * After this call, all streams are supposed to be either SETUP or DRAINING
1403 * (capture only) state.
1404 */
1405 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1406 struct file *file)
1407 {
1408 struct snd_card *card;
1409 struct snd_pcm_runtime *runtime;
1410 struct snd_pcm_substream *s;
1411 wait_queue_t wait;
1412 int result = 0;
1413 int nonblock = 0;
1414
1415 card = substream->pcm->card;
1416 runtime = substream->runtime;
1417
1418 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1419 return -EBADFD;
1420
1421 snd_power_lock(card);
1422 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1423 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1424 if (result < 0) {
1425 snd_power_unlock(card);
1426 return result;
1427 }
1428 }
1429
1430 if (file) {
1431 if (file->f_flags & O_NONBLOCK)
1432 nonblock = 1;
1433 } else if (substream->f_flags & O_NONBLOCK)
1434 nonblock = 1;
1435
1436 down_read(&snd_pcm_link_rwsem);
1437 snd_pcm_stream_lock_irq(substream);
1438 /* resume pause */
1439 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1440 snd_pcm_pause(substream, 0);
1441
1442 /* pre-start/stop - all running streams are changed to DRAINING state */
1443 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1444 if (result < 0)
1445 goto unlock;
1446 /* in non-blocking, we don't wait in ioctl but let caller poll */
1447 if (nonblock) {
1448 result = -EAGAIN;
1449 goto unlock;
1450 }
1451
1452 for (;;) {
1453 long tout;
1454 struct snd_pcm_runtime *to_check;
1455 if (signal_pending(current)) {
1456 result = -ERESTARTSYS;
1457 break;
1458 }
1459 /* find a substream to drain */
1460 to_check = NULL;
1461 snd_pcm_group_for_each_entry(s, substream) {
1462 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1463 continue;
1464 runtime = s->runtime;
1465 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1466 to_check = runtime;
1467 break;
1468 }
1469 }
1470 if (!to_check)
1471 break; /* all drained */
1472 init_waitqueue_entry(&wait, current);
1473 add_wait_queue(&to_check->sleep, &wait);
1474 set_current_state(TASK_INTERRUPTIBLE);
1475 snd_pcm_stream_unlock_irq(substream);
1476 up_read(&snd_pcm_link_rwsem);
1477 snd_power_unlock(card);
1478 tout = schedule_timeout(10 * HZ);
1479 snd_power_lock(card);
1480 down_read(&snd_pcm_link_rwsem);
1481 snd_pcm_stream_lock_irq(substream);
1482 remove_wait_queue(&to_check->sleep, &wait);
1483 if (tout == 0) {
1484 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1485 result = -ESTRPIPE;
1486 else {
1487 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1488 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1489 result = -EIO;
1490 }
1491 break;
1492 }
1493 }
1494
1495 unlock:
1496 snd_pcm_stream_unlock_irq(substream);
1497 up_read(&snd_pcm_link_rwsem);
1498 snd_power_unlock(card);
1499
1500 return result;
1501 }
1502
1503 /*
1504 * drop ioctl
1505 *
1506 * Immediately put all linked substreams into SETUP state.
1507 */
1508 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1509 {
1510 struct snd_pcm_runtime *runtime;
1511 struct snd_card *card;
1512 int result = 0;
1513
1514 if (PCM_RUNTIME_CHECK(substream))
1515 return -ENXIO;
1516 runtime = substream->runtime;
1517 card = substream->pcm->card;
1518
1519 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1520 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1521 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1522 return -EBADFD;
1523
1524 snd_pcm_stream_lock_irq(substream);
1525 /* resume pause */
1526 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1527 snd_pcm_pause(substream, 0);
1528
1529 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1530 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1531 snd_pcm_stream_unlock_irq(substream);
1532
1533 return result;
1534 }
1535
1536
1537 /* WARNING: Don't forget to fput back the file */
1538 static struct file *snd_pcm_file_fd(int fd)
1539 {
1540 struct file *file;
1541 struct inode *inode;
1542 unsigned int minor;
1543
1544 file = fget(fd);
1545 if (!file)
1546 return NULL;
1547 inode = file->f_path.dentry->d_inode;
1548 if (!S_ISCHR(inode->i_mode) ||
1549 imajor(inode) != snd_major) {
1550 fput(file);
1551 return NULL;
1552 }
1553 minor = iminor(inode);
1554 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1555 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1556 fput(file);
1557 return NULL;
1558 }
1559 return file;
1560 }
1561
1562 /*
1563 * PCM link handling
1564 */
1565 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1566 {
1567 int res = 0;
1568 struct file *file;
1569 struct snd_pcm_file *pcm_file;
1570 struct snd_pcm_substream *substream1;
1571
1572 file = snd_pcm_file_fd(fd);
1573 if (!file)
1574 return -EBADFD;
1575 pcm_file = file->private_data;
1576 substream1 = pcm_file->substream;
1577 down_write(&snd_pcm_link_rwsem);
1578 write_lock_irq(&snd_pcm_link_rwlock);
1579 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1580 substream->runtime->status->state != substream1->runtime->status->state) {
1581 res = -EBADFD;
1582 goto _end;
1583 }
1584 if (snd_pcm_stream_linked(substream1)) {
1585 res = -EALREADY;
1586 goto _end;
1587 }
1588 if (!snd_pcm_stream_linked(substream)) {
1589 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1590 if (substream->group == NULL) {
1591 res = -ENOMEM;
1592 goto _end;
1593 }
1594 spin_lock_init(&substream->group->lock);
1595 INIT_LIST_HEAD(&substream->group->substreams);
1596 list_add_tail(&substream->link_list, &substream->group->substreams);
1597 substream->group->count = 1;
1598 }
1599 list_add_tail(&substream1->link_list, &substream->group->substreams);
1600 substream->group->count++;
1601 substream1->group = substream->group;
1602 _end:
1603 write_unlock_irq(&snd_pcm_link_rwlock);
1604 up_write(&snd_pcm_link_rwsem);
1605 fput(file);
1606 return res;
1607 }
1608
1609 static void relink_to_local(struct snd_pcm_substream *substream)
1610 {
1611 substream->group = &substream->self_group;
1612 INIT_LIST_HEAD(&substream->self_group.substreams);
1613 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1614 }
1615
1616 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1617 {
1618 struct snd_pcm_substream *s;
1619 int res = 0;
1620
1621 down_write(&snd_pcm_link_rwsem);
1622 write_lock_irq(&snd_pcm_link_rwlock);
1623 if (!snd_pcm_stream_linked(substream)) {
1624 res = -EALREADY;
1625 goto _end;
1626 }
1627 list_del(&substream->link_list);
1628 substream->group->count--;
1629 if (substream->group->count == 1) { /* detach the last stream, too */
1630 snd_pcm_group_for_each_entry(s, substream) {
1631 relink_to_local(s);
1632 break;
1633 }
1634 kfree(substream->group);
1635 }
1636 relink_to_local(substream);
1637 _end:
1638 write_unlock_irq(&snd_pcm_link_rwlock);
1639 up_write(&snd_pcm_link_rwsem);
1640 return res;
1641 }
1642
1643 /*
1644 * hw configurator
1645 */
1646 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1647 struct snd_pcm_hw_rule *rule)
1648 {
1649 struct snd_interval t;
1650 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1651 hw_param_interval_c(params, rule->deps[1]), &t);
1652 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1653 }
1654
1655 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1656 struct snd_pcm_hw_rule *rule)
1657 {
1658 struct snd_interval t;
1659 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1660 hw_param_interval_c(params, rule->deps[1]), &t);
1661 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1662 }
1663
1664 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1665 struct snd_pcm_hw_rule *rule)
1666 {
1667 struct snd_interval t;
1668 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1669 hw_param_interval_c(params, rule->deps[1]),
1670 (unsigned long) rule->private, &t);
1671 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1672 }
1673
1674 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1675 struct snd_pcm_hw_rule *rule)
1676 {
1677 struct snd_interval t;
1678 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1679 (unsigned long) rule->private,
1680 hw_param_interval_c(params, rule->deps[1]), &t);
1681 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1682 }
1683
1684 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1685 struct snd_pcm_hw_rule *rule)
1686 {
1687 unsigned int k;
1688 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1689 struct snd_mask m;
1690 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1691 snd_mask_any(&m);
1692 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1693 int bits;
1694 if (! snd_mask_test(mask, k))
1695 continue;
1696 bits = snd_pcm_format_physical_width(k);
1697 if (bits <= 0)
1698 continue; /* ignore invalid formats */
1699 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1700 snd_mask_reset(&m, k);
1701 }
1702 return snd_mask_refine(mask, &m);
1703 }
1704
1705 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1706 struct snd_pcm_hw_rule *rule)
1707 {
1708 struct snd_interval t;
1709 unsigned int k;
1710 t.min = UINT_MAX;
1711 t.max = 0;
1712 t.openmin = 0;
1713 t.openmax = 0;
1714 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1715 int bits;
1716 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1717 continue;
1718 bits = snd_pcm_format_physical_width(k);
1719 if (bits <= 0)
1720 continue; /* ignore invalid formats */
1721 if (t.min > (unsigned)bits)
1722 t.min = bits;
1723 if (t.max < (unsigned)bits)
1724 t.max = bits;
1725 }
1726 t.integer = 1;
1727 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1728 }
1729
1730 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1731 #error "Change this table"
1732 #endif
1733
1734 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1735 48000, 64000, 88200, 96000, 176400, 192000 };
1736
1737 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1738 .count = ARRAY_SIZE(rates),
1739 .list = rates,
1740 };
1741
1742 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1743 struct snd_pcm_hw_rule *rule)
1744 {
1745 struct snd_pcm_hardware *hw = rule->private;
1746 return snd_interval_list(hw_param_interval(params, rule->var),
1747 snd_pcm_known_rates.count,
1748 snd_pcm_known_rates.list, hw->rates);
1749 }
1750
1751 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1752 struct snd_pcm_hw_rule *rule)
1753 {
1754 struct snd_interval t;
1755 struct snd_pcm_substream *substream = rule->private;
1756 t.min = 0;
1757 t.max = substream->buffer_bytes_max;
1758 t.openmin = 0;
1759 t.openmax = 0;
1760 t.integer = 1;
1761 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1762 }
1763
1764 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1765 {
1766 struct snd_pcm_runtime *runtime = substream->runtime;
1767 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1768 int k, err;
1769
1770 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1771 snd_mask_any(constrs_mask(constrs, k));
1772 }
1773
1774 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1775 snd_interval_any(constrs_interval(constrs, k));
1776 }
1777
1778 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1779 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1780 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1781 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1782 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1783
1784 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1785 snd_pcm_hw_rule_format, NULL,
1786 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1787 if (err < 0)
1788 return err;
1789 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1790 snd_pcm_hw_rule_sample_bits, NULL,
1791 SNDRV_PCM_HW_PARAM_FORMAT,
1792 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1793 if (err < 0)
1794 return err;
1795 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1796 snd_pcm_hw_rule_div, NULL,
1797 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1798 if (err < 0)
1799 return err;
1800 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1801 snd_pcm_hw_rule_mul, NULL,
1802 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1803 if (err < 0)
1804 return err;
1805 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1806 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1807 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1808 if (err < 0)
1809 return err;
1810 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1811 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1812 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1813 if (err < 0)
1814 return err;
1815 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1816 snd_pcm_hw_rule_div, NULL,
1817 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1818 if (err < 0)
1819 return err;
1820 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1821 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1822 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1823 if (err < 0)
1824 return err;
1825 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1826 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1827 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1828 if (err < 0)
1829 return err;
1830 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1831 snd_pcm_hw_rule_div, NULL,
1832 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1833 if (err < 0)
1834 return err;
1835 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1836 snd_pcm_hw_rule_div, NULL,
1837 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1838 if (err < 0)
1839 return err;
1840 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1841 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1842 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1843 if (err < 0)
1844 return err;
1845 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1846 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1847 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1848 if (err < 0)
1849 return err;
1850 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1851 snd_pcm_hw_rule_mul, NULL,
1852 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1853 if (err < 0)
1854 return err;
1855 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1856 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1857 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1858 if (err < 0)
1859 return err;
1860 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1861 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1862 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1863 if (err < 0)
1864 return err;
1865 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1866 snd_pcm_hw_rule_muldivk, (void*) 8,
1867 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1868 if (err < 0)
1869 return err;
1870 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1871 snd_pcm_hw_rule_muldivk, (void*) 8,
1872 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1873 if (err < 0)
1874 return err;
1875 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1876 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1877 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1878 if (err < 0)
1879 return err;
1880 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1881 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1882 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1883 if (err < 0)
1884 return err;
1885 return 0;
1886 }
1887
1888 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1889 {
1890 struct snd_pcm_runtime *runtime = substream->runtime;
1891 struct snd_pcm_hardware *hw = &runtime->hw;
1892 int err;
1893 unsigned int mask = 0;
1894
1895 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1896 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1897 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1898 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1899 if (hw->info & SNDRV_PCM_INFO_MMAP) {
1900 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1901 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1902 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1903 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1904 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1905 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1906 }
1907 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1908 if (err < 0)
1909 return err;
1910
1911 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1912 if (err < 0)
1913 return err;
1914
1915 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1916 if (err < 0)
1917 return err;
1918
1919 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1920 hw->channels_min, hw->channels_max);
1921 if (err < 0)
1922 return err;
1923
1924 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1925 hw->rate_min, hw->rate_max);
1926 if (err < 0)
1927 return err;
1928
1929 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1930 hw->period_bytes_min, hw->period_bytes_max);
1931 if (err < 0)
1932 return err;
1933
1934 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1935 hw->periods_min, hw->periods_max);
1936 if (err < 0)
1937 return err;
1938
1939 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1940 hw->period_bytes_min, hw->buffer_bytes_max);
1941 if (err < 0)
1942 return err;
1943
1944 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1945 snd_pcm_hw_rule_buffer_bytes_max, substream,
1946 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1947 if (err < 0)
1948 return err;
1949
1950 /* FIXME: remove */
1951 if (runtime->dma_bytes) {
1952 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1953 if (err < 0)
1954 return -EINVAL;
1955 }
1956
1957 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1958 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1959 snd_pcm_hw_rule_rate, hw,
1960 SNDRV_PCM_HW_PARAM_RATE, -1);
1961 if (err < 0)
1962 return err;
1963 }
1964
1965 /* FIXME: this belong to lowlevel */
1966 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1967
1968 return 0;
1969 }
1970
1971 static void pcm_release_private(struct snd_pcm_substream *substream)
1972 {
1973 snd_pcm_unlink(substream);
1974 }
1975
1976 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
1977 {
1978 substream->ref_count--;
1979 if (substream->ref_count > 0)
1980 return;
1981
1982 snd_pcm_drop(substream);
1983 if (substream->hw_opened) {
1984 if (substream->ops->hw_free != NULL)
1985 substream->ops->hw_free(substream);
1986 substream->ops->close(substream);
1987 substream->hw_opened = 0;
1988 }
1989 if (substream->pcm_release) {
1990 substream->pcm_release(substream);
1991 substream->pcm_release = NULL;
1992 }
1993 snd_pcm_detach_substream(substream);
1994 }
1995
1996 EXPORT_SYMBOL(snd_pcm_release_substream);
1997
1998 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
1999 struct file *file,
2000 struct snd_pcm_substream **rsubstream)
2001 {
2002 struct snd_pcm_substream *substream;
2003 int err;
2004
2005 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2006 if (err < 0)
2007 return err;
2008 if (substream->ref_count > 1) {
2009 *rsubstream = substream;
2010 return 0;
2011 }
2012
2013 err = snd_pcm_hw_constraints_init(substream);
2014 if (err < 0) {
2015 snd_printd("snd_pcm_hw_constraints_init failed\n");
2016 goto error;
2017 }
2018
2019 if ((err = substream->ops->open(substream)) < 0)
2020 goto error;
2021
2022 substream->hw_opened = 1;
2023
2024 err = snd_pcm_hw_constraints_complete(substream);
2025 if (err < 0) {
2026 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2027 goto error;
2028 }
2029
2030 *rsubstream = substream;
2031 return 0;
2032
2033 error:
2034 snd_pcm_release_substream(substream);
2035 return err;
2036 }
2037
2038 EXPORT_SYMBOL(snd_pcm_open_substream);
2039
2040 static int snd_pcm_open_file(struct file *file,
2041 struct snd_pcm *pcm,
2042 int stream,
2043 struct snd_pcm_file **rpcm_file)
2044 {
2045 struct snd_pcm_file *pcm_file;
2046 struct snd_pcm_substream *substream;
2047 struct snd_pcm_str *str;
2048 int err;
2049
2050 if (rpcm_file)
2051 *rpcm_file = NULL;
2052
2053 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2054 if (err < 0)
2055 return err;
2056
2057 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2058 if (pcm_file == NULL) {
2059 snd_pcm_release_substream(substream);
2060 return -ENOMEM;
2061 }
2062 pcm_file->substream = substream;
2063 if (substream->ref_count == 1) {
2064 str = substream->pstr;
2065 substream->file = pcm_file;
2066 substream->pcm_release = pcm_release_private;
2067 }
2068 file->private_data = pcm_file;
2069 if (rpcm_file)
2070 *rpcm_file = pcm_file;
2071 return 0;
2072 }
2073
2074 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2075 {
2076 struct snd_pcm *pcm;
2077
2078 pcm = snd_lookup_minor_data(iminor(inode),
2079 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2080 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2081 }
2082
2083 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2084 {
2085 struct snd_pcm *pcm;
2086
2087 pcm = snd_lookup_minor_data(iminor(inode),
2088 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2089 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2090 }
2091
2092 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2093 {
2094 int err;
2095 struct snd_pcm_file *pcm_file;
2096 wait_queue_t wait;
2097
2098 if (pcm == NULL) {
2099 err = -ENODEV;
2100 goto __error1;
2101 }
2102 err = snd_card_file_add(pcm->card, file);
2103 if (err < 0)
2104 goto __error1;
2105 if (!try_module_get(pcm->card->module)) {
2106 err = -EFAULT;
2107 goto __error2;
2108 }
2109 init_waitqueue_entry(&wait, current);
2110 add_wait_queue(&pcm->open_wait, &wait);
2111 mutex_lock(&pcm->open_mutex);
2112 while (1) {
2113 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2114 if (err >= 0)
2115 break;
2116 if (err == -EAGAIN) {
2117 if (file->f_flags & O_NONBLOCK) {
2118 err = -EBUSY;
2119 break;
2120 }
2121 } else
2122 break;
2123 set_current_state(TASK_INTERRUPTIBLE);
2124 mutex_unlock(&pcm->open_mutex);
2125 schedule();
2126 mutex_lock(&pcm->open_mutex);
2127 if (signal_pending(current)) {
2128 err = -ERESTARTSYS;
2129 break;
2130 }
2131 }
2132 remove_wait_queue(&pcm->open_wait, &wait);
2133 mutex_unlock(&pcm->open_mutex);
2134 if (err < 0)
2135 goto __error;
2136 return err;
2137
2138 __error:
2139 module_put(pcm->card->module);
2140 __error2:
2141 snd_card_file_remove(pcm->card, file);
2142 __error1:
2143 return err;
2144 }
2145
2146 static int snd_pcm_release(struct inode *inode, struct file *file)
2147 {
2148 struct snd_pcm *pcm;
2149 struct snd_pcm_substream *substream;
2150 struct snd_pcm_file *pcm_file;
2151
2152 pcm_file = file->private_data;
2153 substream = pcm_file->substream;
2154 if (snd_BUG_ON(!substream))
2155 return -ENXIO;
2156 pcm = substream->pcm;
2157 mutex_lock(&pcm->open_mutex);
2158 snd_pcm_release_substream(substream);
2159 kfree(pcm_file);
2160 mutex_unlock(&pcm->open_mutex);
2161 wake_up(&pcm->open_wait);
2162 module_put(pcm->card->module);
2163 snd_card_file_remove(pcm->card, file);
2164 return 0;
2165 }
2166
2167 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2168 snd_pcm_uframes_t frames)
2169 {
2170 struct snd_pcm_runtime *runtime = substream->runtime;
2171 snd_pcm_sframes_t appl_ptr;
2172 snd_pcm_sframes_t ret;
2173 snd_pcm_sframes_t hw_avail;
2174
2175 if (frames == 0)
2176 return 0;
2177
2178 snd_pcm_stream_lock_irq(substream);
2179 switch (runtime->status->state) {
2180 case SNDRV_PCM_STATE_PREPARED:
2181 break;
2182 case SNDRV_PCM_STATE_DRAINING:
2183 case SNDRV_PCM_STATE_RUNNING:
2184 if (snd_pcm_update_hw_ptr(substream) >= 0)
2185 break;
2186 /* Fall through */
2187 case SNDRV_PCM_STATE_XRUN:
2188 ret = -EPIPE;
2189 goto __end;
2190 case SNDRV_PCM_STATE_SUSPENDED:
2191 ret = -ESTRPIPE;
2192 goto __end;
2193 default:
2194 ret = -EBADFD;
2195 goto __end;
2196 }
2197
2198 hw_avail = snd_pcm_playback_hw_avail(runtime);
2199 if (hw_avail <= 0) {
2200 ret = 0;
2201 goto __end;
2202 }
2203 if (frames > (snd_pcm_uframes_t)hw_avail)
2204 frames = hw_avail;
2205 appl_ptr = runtime->control->appl_ptr - frames;
2206 if (appl_ptr < 0)
2207 appl_ptr += runtime->boundary;
2208 runtime->control->appl_ptr = appl_ptr;
2209 ret = frames;
2210 __end:
2211 snd_pcm_stream_unlock_irq(substream);
2212 return ret;
2213 }
2214
2215 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2216 snd_pcm_uframes_t frames)
2217 {
2218 struct snd_pcm_runtime *runtime = substream->runtime;
2219 snd_pcm_sframes_t appl_ptr;
2220 snd_pcm_sframes_t ret;
2221 snd_pcm_sframes_t hw_avail;
2222
2223 if (frames == 0)
2224 return 0;
2225
2226 snd_pcm_stream_lock_irq(substream);
2227 switch (runtime->status->state) {
2228 case SNDRV_PCM_STATE_PREPARED:
2229 case SNDRV_PCM_STATE_DRAINING:
2230 break;
2231 case SNDRV_PCM_STATE_RUNNING:
2232 if (snd_pcm_update_hw_ptr(substream) >= 0)
2233 break;
2234 /* Fall through */
2235 case SNDRV_PCM_STATE_XRUN:
2236 ret = -EPIPE;
2237 goto __end;
2238 case SNDRV_PCM_STATE_SUSPENDED:
2239 ret = -ESTRPIPE;
2240 goto __end;
2241 default:
2242 ret = -EBADFD;
2243 goto __end;
2244 }
2245
2246 hw_avail = snd_pcm_capture_hw_avail(runtime);
2247 if (hw_avail <= 0) {
2248 ret = 0;
2249 goto __end;
2250 }
2251 if (frames > (snd_pcm_uframes_t)hw_avail)
2252 frames = hw_avail;
2253 appl_ptr = runtime->control->appl_ptr - frames;
2254 if (appl_ptr < 0)
2255 appl_ptr += runtime->boundary;
2256 runtime->control->appl_ptr = appl_ptr;
2257 ret = frames;
2258 __end:
2259 snd_pcm_stream_unlock_irq(substream);
2260 return ret;
2261 }
2262
2263 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2264 snd_pcm_uframes_t frames)
2265 {
2266 struct snd_pcm_runtime *runtime = substream->runtime;
2267 snd_pcm_sframes_t appl_ptr;
2268 snd_pcm_sframes_t ret;
2269 snd_pcm_sframes_t avail;
2270
2271 if (frames == 0)
2272 return 0;
2273
2274 snd_pcm_stream_lock_irq(substream);
2275 switch (runtime->status->state) {
2276 case SNDRV_PCM_STATE_PREPARED:
2277 case SNDRV_PCM_STATE_PAUSED:
2278 break;
2279 case SNDRV_PCM_STATE_DRAINING:
2280 case SNDRV_PCM_STATE_RUNNING:
2281 if (snd_pcm_update_hw_ptr(substream) >= 0)
2282 break;
2283 /* Fall through */
2284 case SNDRV_PCM_STATE_XRUN:
2285 ret = -EPIPE;
2286 goto __end;
2287 case SNDRV_PCM_STATE_SUSPENDED:
2288 ret = -ESTRPIPE;
2289 goto __end;
2290 default:
2291 ret = -EBADFD;
2292 goto __end;
2293 }
2294
2295 avail = snd_pcm_playback_avail(runtime);
2296 if (avail <= 0) {
2297 ret = 0;
2298 goto __end;
2299 }
2300 if (frames > (snd_pcm_uframes_t)avail)
2301 frames = avail;
2302 appl_ptr = runtime->control->appl_ptr + frames;
2303 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2304 appl_ptr -= runtime->boundary;
2305 runtime->control->appl_ptr = appl_ptr;
2306 ret = frames;
2307 __end:
2308 snd_pcm_stream_unlock_irq(substream);
2309 return ret;
2310 }
2311
2312 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2313 snd_pcm_uframes_t frames)
2314 {
2315 struct snd_pcm_runtime *runtime = substream->runtime;
2316 snd_pcm_sframes_t appl_ptr;
2317 snd_pcm_sframes_t ret;
2318 snd_pcm_sframes_t avail;
2319
2320 if (frames == 0)
2321 return 0;
2322
2323 snd_pcm_stream_lock_irq(substream);
2324 switch (runtime->status->state) {
2325 case SNDRV_PCM_STATE_PREPARED:
2326 case SNDRV_PCM_STATE_DRAINING:
2327 case SNDRV_PCM_STATE_PAUSED:
2328 break;
2329 case SNDRV_PCM_STATE_RUNNING:
2330 if (snd_pcm_update_hw_ptr(substream) >= 0)
2331 break;
2332 /* Fall through */
2333 case SNDRV_PCM_STATE_XRUN:
2334 ret = -EPIPE;
2335 goto __end;
2336 case SNDRV_PCM_STATE_SUSPENDED:
2337 ret = -ESTRPIPE;
2338 goto __end;
2339 default:
2340 ret = -EBADFD;
2341 goto __end;
2342 }
2343
2344 avail = snd_pcm_capture_avail(runtime);
2345 if (avail <= 0) {
2346 ret = 0;
2347 goto __end;
2348 }
2349 if (frames > (snd_pcm_uframes_t)avail)
2350 frames = avail;
2351 appl_ptr = runtime->control->appl_ptr + frames;
2352 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2353 appl_ptr -= runtime->boundary;
2354 runtime->control->appl_ptr = appl_ptr;
2355 ret = frames;
2356 __end:
2357 snd_pcm_stream_unlock_irq(substream);
2358 return ret;
2359 }
2360
2361 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2362 {
2363 struct snd_pcm_runtime *runtime = substream->runtime;
2364 int err;
2365
2366 snd_pcm_stream_lock_irq(substream);
2367 switch (runtime->status->state) {
2368 case SNDRV_PCM_STATE_DRAINING:
2369 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2370 goto __badfd;
2371 case SNDRV_PCM_STATE_RUNNING:
2372 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2373 break;
2374 /* Fall through */
2375 case SNDRV_PCM_STATE_PREPARED:
2376 case SNDRV_PCM_STATE_SUSPENDED:
2377 err = 0;
2378 break;
2379 case SNDRV_PCM_STATE_XRUN:
2380 err = -EPIPE;
2381 break;
2382 default:
2383 __badfd:
2384 err = -EBADFD;
2385 break;
2386 }
2387 snd_pcm_stream_unlock_irq(substream);
2388 return err;
2389 }
2390
2391 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2392 snd_pcm_sframes_t __user *res)
2393 {
2394 struct snd_pcm_runtime *runtime = substream->runtime;
2395 int err;
2396 snd_pcm_sframes_t n = 0;
2397
2398 snd_pcm_stream_lock_irq(substream);
2399 switch (runtime->status->state) {
2400 case SNDRV_PCM_STATE_DRAINING:
2401 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2402 goto __badfd;
2403 case SNDRV_PCM_STATE_RUNNING:
2404 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2405 break;
2406 /* Fall through */
2407 case SNDRV_PCM_STATE_PREPARED:
2408 case SNDRV_PCM_STATE_SUSPENDED:
2409 err = 0;
2410 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2411 n = snd_pcm_playback_hw_avail(runtime);
2412 else
2413 n = snd_pcm_capture_avail(runtime);
2414 n += runtime->delay;
2415 break;
2416 case SNDRV_PCM_STATE_XRUN:
2417 err = -EPIPE;
2418 break;
2419 default:
2420 __badfd:
2421 err = -EBADFD;
2422 break;
2423 }
2424 snd_pcm_stream_unlock_irq(substream);
2425 if (!err)
2426 if (put_user(n, res))
2427 err = -EFAULT;
2428 return err;
2429 }
2430
2431 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2432 struct snd_pcm_sync_ptr __user *_sync_ptr)
2433 {
2434 struct snd_pcm_runtime *runtime = substream->runtime;
2435 struct snd_pcm_sync_ptr sync_ptr;
2436 volatile struct snd_pcm_mmap_status *status;
2437 volatile struct snd_pcm_mmap_control *control;
2438 int err;
2439
2440 memset(&sync_ptr, 0, sizeof(sync_ptr));
2441 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2442 return -EFAULT;
2443 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2444 return -EFAULT;
2445 status = runtime->status;
2446 control = runtime->control;
2447 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2448 err = snd_pcm_hwsync(substream);
2449 if (err < 0)
2450 return err;
2451 }
2452 snd_pcm_stream_lock_irq(substream);
2453 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2454 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2455 else
2456 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2457 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2458 control->avail_min = sync_ptr.c.control.avail_min;
2459 else
2460 sync_ptr.c.control.avail_min = control->avail_min;
2461 sync_ptr.s.status.state = status->state;
2462 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2463 sync_ptr.s.status.tstamp = status->tstamp;
2464 sync_ptr.s.status.suspended_state = status->suspended_state;
2465 snd_pcm_stream_unlock_irq(substream);
2466 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2467 return -EFAULT;
2468 return 0;
2469 }
2470
2471 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2472 {
2473 struct snd_pcm_runtime *runtime = substream->runtime;
2474 int arg;
2475
2476 if (get_user(arg, _arg))
2477 return -EFAULT;
2478 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2479 return -EINVAL;
2480 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2481 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2482 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2483 return 0;
2484 }
2485
2486 static int snd_pcm_common_ioctl1(struct file *file,
2487 struct snd_pcm_substream *substream,
2488 unsigned int cmd, void __user *arg)
2489 {
2490 switch (cmd) {
2491 case SNDRV_PCM_IOCTL_PVERSION:
2492 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2493 case SNDRV_PCM_IOCTL_INFO:
2494 return snd_pcm_info_user(substream, arg);
2495 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2496 return 0;
2497 case SNDRV_PCM_IOCTL_TTSTAMP:
2498 return snd_pcm_tstamp(substream, arg);
2499 case SNDRV_PCM_IOCTL_HW_REFINE:
2500 return snd_pcm_hw_refine_user(substream, arg);
2501 case SNDRV_PCM_IOCTL_HW_PARAMS:
2502 return snd_pcm_hw_params_user(substream, arg);
2503 case SNDRV_PCM_IOCTL_HW_FREE:
2504 return snd_pcm_hw_free(substream);
2505 case SNDRV_PCM_IOCTL_SW_PARAMS:
2506 return snd_pcm_sw_params_user(substream, arg);
2507 case SNDRV_PCM_IOCTL_STATUS:
2508 return snd_pcm_status_user(substream, arg);
2509 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2510 return snd_pcm_channel_info_user(substream, arg);
2511 case SNDRV_PCM_IOCTL_PREPARE:
2512 return snd_pcm_prepare(substream, file);
2513 case SNDRV_PCM_IOCTL_RESET:
2514 return snd_pcm_reset(substream);
2515 case SNDRV_PCM_IOCTL_START:
2516 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2517 case SNDRV_PCM_IOCTL_LINK:
2518 return snd_pcm_link(substream, (int)(unsigned long) arg);
2519 case SNDRV_PCM_IOCTL_UNLINK:
2520 return snd_pcm_unlink(substream);
2521 case SNDRV_PCM_IOCTL_RESUME:
2522 return snd_pcm_resume(substream);
2523 case SNDRV_PCM_IOCTL_XRUN:
2524 return snd_pcm_xrun(substream);
2525 case SNDRV_PCM_IOCTL_HWSYNC:
2526 return snd_pcm_hwsync(substream);
2527 case SNDRV_PCM_IOCTL_DELAY:
2528 return snd_pcm_delay(substream, arg);
2529 case SNDRV_PCM_IOCTL_SYNC_PTR:
2530 return snd_pcm_sync_ptr(substream, arg);
2531 #ifdef CONFIG_SND_SUPPORT_OLD_API
2532 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2533 return snd_pcm_hw_refine_old_user(substream, arg);
2534 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2535 return snd_pcm_hw_params_old_user(substream, arg);
2536 #endif
2537 case SNDRV_PCM_IOCTL_DRAIN:
2538 return snd_pcm_drain(substream, file);
2539 case SNDRV_PCM_IOCTL_DROP:
2540 return snd_pcm_drop(substream);
2541 case SNDRV_PCM_IOCTL_PAUSE:
2542 {
2543 int res;
2544 snd_pcm_stream_lock_irq(substream);
2545 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2546 snd_pcm_stream_unlock_irq(substream);
2547 return res;
2548 }
2549 }
2550 snd_printd("unknown ioctl = 0x%x\n", cmd);
2551 return -ENOTTY;
2552 }
2553
2554 static int snd_pcm_playback_ioctl1(struct file *file,
2555 struct snd_pcm_substream *substream,
2556 unsigned int cmd, void __user *arg)
2557 {
2558 if (snd_BUG_ON(!substream))
2559 return -ENXIO;
2560 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2561 return -EINVAL;
2562 switch (cmd) {
2563 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2564 {
2565 struct snd_xferi xferi;
2566 struct snd_xferi __user *_xferi = arg;
2567 struct snd_pcm_runtime *runtime = substream->runtime;
2568 snd_pcm_sframes_t result;
2569 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2570 return -EBADFD;
2571 if (put_user(0, &_xferi->result))
2572 return -EFAULT;
2573 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2574 return -EFAULT;
2575 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2576 __put_user(result, &_xferi->result);
2577 return result < 0 ? result : 0;
2578 }
2579 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2580 {
2581 struct snd_xfern xfern;
2582 struct snd_xfern __user *_xfern = arg;
2583 struct snd_pcm_runtime *runtime = substream->runtime;
2584 void __user **bufs;
2585 snd_pcm_sframes_t result;
2586 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2587 return -EBADFD;
2588 if (runtime->channels > 128)
2589 return -EINVAL;
2590 if (put_user(0, &_xfern->result))
2591 return -EFAULT;
2592 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2593 return -EFAULT;
2594
2595 bufs = memdup_user(xfern.bufs,
2596 sizeof(void *) * runtime->channels);
2597 if (IS_ERR(bufs))
2598 return PTR_ERR(bufs);
2599 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2600 kfree(bufs);
2601 __put_user(result, &_xfern->result);
2602 return result < 0 ? result : 0;
2603 }
2604 case SNDRV_PCM_IOCTL_REWIND:
2605 {
2606 snd_pcm_uframes_t frames;
2607 snd_pcm_uframes_t __user *_frames = arg;
2608 snd_pcm_sframes_t result;
2609 if (get_user(frames, _frames))
2610 return -EFAULT;
2611 if (put_user(0, _frames))
2612 return -EFAULT;
2613 result = snd_pcm_playback_rewind(substream, frames);
2614 __put_user(result, _frames);
2615 return result < 0 ? result : 0;
2616 }
2617 case SNDRV_PCM_IOCTL_FORWARD:
2618 {
2619 snd_pcm_uframes_t frames;
2620 snd_pcm_uframes_t __user *_frames = arg;
2621 snd_pcm_sframes_t result;
2622 if (get_user(frames, _frames))
2623 return -EFAULT;
2624 if (put_user(0, _frames))
2625 return -EFAULT;
2626 result = snd_pcm_playback_forward(substream, frames);
2627 __put_user(result, _frames);
2628 return result < 0 ? result : 0;
2629 }
2630 }
2631 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2632 }
2633
2634 static int snd_pcm_capture_ioctl1(struct file *file,
2635 struct snd_pcm_substream *substream,
2636 unsigned int cmd, void __user *arg)
2637 {
2638 if (snd_BUG_ON(!substream))
2639 return -ENXIO;
2640 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2641 return -EINVAL;
2642 switch (cmd) {
2643 case SNDRV_PCM_IOCTL_READI_FRAMES:
2644 {
2645 struct snd_xferi xferi;
2646 struct snd_xferi __user *_xferi = arg;
2647 struct snd_pcm_runtime *runtime = substream->runtime;
2648 snd_pcm_sframes_t result;
2649 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2650 return -EBADFD;
2651 if (put_user(0, &_xferi->result))
2652 return -EFAULT;
2653 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2654 return -EFAULT;
2655 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2656 __put_user(result, &_xferi->result);
2657 return result < 0 ? result : 0;
2658 }
2659 case SNDRV_PCM_IOCTL_READN_FRAMES:
2660 {
2661 struct snd_xfern xfern;
2662 struct snd_xfern __user *_xfern = arg;
2663 struct snd_pcm_runtime *runtime = substream->runtime;
2664 void *bufs;
2665 snd_pcm_sframes_t result;
2666 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2667 return -EBADFD;
2668 if (runtime->channels > 128)
2669 return -EINVAL;
2670 if (put_user(0, &_xfern->result))
2671 return -EFAULT;
2672 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2673 return -EFAULT;
2674
2675 bufs = memdup_user(xfern.bufs,
2676 sizeof(void *) * runtime->channels);
2677 if (IS_ERR(bufs))
2678 return PTR_ERR(bufs);
2679 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2680 kfree(bufs);
2681 __put_user(result, &_xfern->result);
2682 return result < 0 ? result : 0;
2683 }
2684 case SNDRV_PCM_IOCTL_REWIND:
2685 {
2686 snd_pcm_uframes_t frames;
2687 snd_pcm_uframes_t __user *_frames = arg;
2688 snd_pcm_sframes_t result;
2689 if (get_user(frames, _frames))
2690 return -EFAULT;
2691 if (put_user(0, _frames))
2692 return -EFAULT;
2693 result = snd_pcm_capture_rewind(substream, frames);
2694 __put_user(result, _frames);
2695 return result < 0 ? result : 0;
2696 }
2697 case SNDRV_PCM_IOCTL_FORWARD:
2698 {
2699 snd_pcm_uframes_t frames;
2700 snd_pcm_uframes_t __user *_frames = arg;
2701 snd_pcm_sframes_t result;
2702 if (get_user(frames, _frames))
2703 return -EFAULT;
2704 if (put_user(0, _frames))
2705 return -EFAULT;
2706 result = snd_pcm_capture_forward(substream, frames);
2707 __put_user(result, _frames);
2708 return result < 0 ? result : 0;
2709 }
2710 }
2711 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2712 }
2713
2714 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2715 unsigned long arg)
2716 {
2717 struct snd_pcm_file *pcm_file;
2718
2719 pcm_file = file->private_data;
2720
2721 if (((cmd >> 8) & 0xff) != 'A')
2722 return -ENOTTY;
2723
2724 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2725 (void __user *)arg);
2726 }
2727
2728 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2729 unsigned long arg)
2730 {
2731 struct snd_pcm_file *pcm_file;
2732
2733 pcm_file = file->private_data;
2734
2735 if (((cmd >> 8) & 0xff) != 'A')
2736 return -ENOTTY;
2737
2738 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2739 (void __user *)arg);
2740 }
2741
2742 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2743 unsigned int cmd, void *arg)
2744 {
2745 mm_segment_t fs;
2746 int result;
2747
2748 fs = snd_enter_user();
2749 switch (substream->stream) {
2750 case SNDRV_PCM_STREAM_PLAYBACK:
2751 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2752 (void __user *)arg);
2753 break;
2754 case SNDRV_PCM_STREAM_CAPTURE:
2755 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2756 (void __user *)arg);
2757 break;
2758 default:
2759 result = -EINVAL;
2760 break;
2761 }
2762 snd_leave_user(fs);
2763 return result;
2764 }
2765
2766 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2767
2768 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2769 loff_t * offset)
2770 {
2771 struct snd_pcm_file *pcm_file;
2772 struct snd_pcm_substream *substream;
2773 struct snd_pcm_runtime *runtime;
2774 snd_pcm_sframes_t result;
2775
2776 pcm_file = file->private_data;
2777 substream = pcm_file->substream;
2778 if (PCM_RUNTIME_CHECK(substream))
2779 return -ENXIO;
2780 runtime = substream->runtime;
2781 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2782 return -EBADFD;
2783 if (!frame_aligned(runtime, count))
2784 return -EINVAL;
2785 count = bytes_to_frames(runtime, count);
2786 result = snd_pcm_lib_read(substream, buf, count);
2787 if (result > 0)
2788 result = frames_to_bytes(runtime, result);
2789 return result;
2790 }
2791
2792 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2793 size_t count, loff_t * offset)
2794 {
2795 struct snd_pcm_file *pcm_file;
2796 struct snd_pcm_substream *substream;
2797 struct snd_pcm_runtime *runtime;
2798 snd_pcm_sframes_t result;
2799
2800 pcm_file = file->private_data;
2801 substream = pcm_file->substream;
2802 if (PCM_RUNTIME_CHECK(substream))
2803 return -ENXIO;
2804 runtime = substream->runtime;
2805 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2806 return -EBADFD;
2807 if (!frame_aligned(runtime, count))
2808 return -EINVAL;
2809 count = bytes_to_frames(runtime, count);
2810 result = snd_pcm_lib_write(substream, buf, count);
2811 if (result > 0)
2812 result = frames_to_bytes(runtime, result);
2813 return result;
2814 }
2815
2816 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2817 unsigned long nr_segs, loff_t pos)
2818
2819 {
2820 struct snd_pcm_file *pcm_file;
2821 struct snd_pcm_substream *substream;
2822 struct snd_pcm_runtime *runtime;
2823 snd_pcm_sframes_t result;
2824 unsigned long i;
2825 void __user **bufs;
2826 snd_pcm_uframes_t frames;
2827
2828 pcm_file = iocb->ki_filp->private_data;
2829 substream = pcm_file->substream;
2830 if (PCM_RUNTIME_CHECK(substream))
2831 return -ENXIO;
2832 runtime = substream->runtime;
2833 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2834 return -EBADFD;
2835 if (nr_segs > 1024 || nr_segs != runtime->channels)
2836 return -EINVAL;
2837 if (!frame_aligned(runtime, iov->iov_len))
2838 return -EINVAL;
2839 frames = bytes_to_samples(runtime, iov->iov_len);
2840 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2841 if (bufs == NULL)
2842 return -ENOMEM;
2843 for (i = 0; i < nr_segs; ++i)
2844 bufs[i] = iov[i].iov_base;
2845 result = snd_pcm_lib_readv(substream, bufs, frames);
2846 if (result > 0)
2847 result = frames_to_bytes(runtime, result);
2848 kfree(bufs);
2849 return result;
2850 }
2851
2852 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2853 unsigned long nr_segs, loff_t pos)
2854 {
2855 struct snd_pcm_file *pcm_file;
2856 struct snd_pcm_substream *substream;
2857 struct snd_pcm_runtime *runtime;
2858 snd_pcm_sframes_t result;
2859 unsigned long i;
2860 void __user **bufs;
2861 snd_pcm_uframes_t frames;
2862
2863 pcm_file = iocb->ki_filp->private_data;
2864 substream = pcm_file->substream;
2865 if (PCM_RUNTIME_CHECK(substream))
2866 return -ENXIO;
2867 runtime = substream->runtime;
2868 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2869 return -EBADFD;
2870 if (nr_segs > 128 || nr_segs != runtime->channels ||
2871 !frame_aligned(runtime, iov->iov_len))
2872 return -EINVAL;
2873 frames = bytes_to_samples(runtime, iov->iov_len);
2874 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2875 if (bufs == NULL)
2876 return -ENOMEM;
2877 for (i = 0; i < nr_segs; ++i)
2878 bufs[i] = iov[i].iov_base;
2879 result = snd_pcm_lib_writev(substream, bufs, frames);
2880 if (result > 0)
2881 result = frames_to_bytes(runtime, result);
2882 kfree(bufs);
2883 return result;
2884 }
2885
2886 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2887 {
2888 struct snd_pcm_file *pcm_file;
2889 struct snd_pcm_substream *substream;
2890 struct snd_pcm_runtime *runtime;
2891 unsigned int mask;
2892 snd_pcm_uframes_t avail;
2893
2894 pcm_file = file->private_data;
2895
2896 substream = pcm_file->substream;
2897 if (PCM_RUNTIME_CHECK(substream))
2898 return -ENXIO;
2899 runtime = substream->runtime;
2900
2901 poll_wait(file, &runtime->sleep, wait);
2902
2903 snd_pcm_stream_lock_irq(substream);
2904 avail = snd_pcm_playback_avail(runtime);
2905 switch (runtime->status->state) {
2906 case SNDRV_PCM_STATE_RUNNING:
2907 case SNDRV_PCM_STATE_PREPARED:
2908 case SNDRV_PCM_STATE_PAUSED:
2909 if (avail >= runtime->control->avail_min) {
2910 mask = POLLOUT | POLLWRNORM;
2911 break;
2912 }
2913 /* Fall through */
2914 case SNDRV_PCM_STATE_DRAINING:
2915 mask = 0;
2916 break;
2917 default:
2918 mask = POLLOUT | POLLWRNORM | POLLERR;
2919 break;
2920 }
2921 snd_pcm_stream_unlock_irq(substream);
2922 return mask;
2923 }
2924
2925 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2926 {
2927 struct snd_pcm_file *pcm_file;
2928 struct snd_pcm_substream *substream;
2929 struct snd_pcm_runtime *runtime;
2930 unsigned int mask;
2931 snd_pcm_uframes_t avail;
2932
2933 pcm_file = file->private_data;
2934
2935 substream = pcm_file->substream;
2936 if (PCM_RUNTIME_CHECK(substream))
2937 return -ENXIO;
2938 runtime = substream->runtime;
2939
2940 poll_wait(file, &runtime->sleep, wait);
2941
2942 snd_pcm_stream_lock_irq(substream);
2943 avail = snd_pcm_capture_avail(runtime);
2944 switch (runtime->status->state) {
2945 case SNDRV_PCM_STATE_RUNNING:
2946 case SNDRV_PCM_STATE_PREPARED:
2947 case SNDRV_PCM_STATE_PAUSED:
2948 if (avail >= runtime->control->avail_min) {
2949 mask = POLLIN | POLLRDNORM;
2950 break;
2951 }
2952 mask = 0;
2953 break;
2954 case SNDRV_PCM_STATE_DRAINING:
2955 if (avail > 0) {
2956 mask = POLLIN | POLLRDNORM;
2957 break;
2958 }
2959 /* Fall through */
2960 default:
2961 mask = POLLIN | POLLRDNORM | POLLERR;
2962 break;
2963 }
2964 snd_pcm_stream_unlock_irq(substream);
2965 return mask;
2966 }
2967
2968 /*
2969 * mmap support
2970 */
2971
2972 /*
2973 * Only on coherent architectures, we can mmap the status and the control records
2974 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
2975 */
2976 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
2977 /*
2978 * mmap status record
2979 */
2980 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
2981 struct vm_fault *vmf)
2982 {
2983 struct snd_pcm_substream *substream = area->vm_private_data;
2984 struct snd_pcm_runtime *runtime;
2985
2986 if (substream == NULL)
2987 return VM_FAULT_SIGBUS;
2988 runtime = substream->runtime;
2989 vmf->page = virt_to_page(runtime->status);
2990 get_page(vmf->page);
2991 return 0;
2992 }
2993
2994 static const struct vm_operations_struct snd_pcm_vm_ops_status =
2995 {
2996 .fault = snd_pcm_mmap_status_fault,
2997 };
2998
2999 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3000 struct vm_area_struct *area)
3001 {
3002 struct snd_pcm_runtime *runtime;
3003 long size;
3004 if (!(area->vm_flags & VM_READ))
3005 return -EINVAL;
3006 runtime = substream->runtime;
3007 size = area->vm_end - area->vm_start;
3008 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3009 return -EINVAL;
3010 area->vm_ops = &snd_pcm_vm_ops_status;
3011 area->vm_private_data = substream;
3012 area->vm_flags |= VM_RESERVED;
3013 return 0;
3014 }
3015
3016 /*
3017 * mmap control record
3018 */
3019 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3020 struct vm_fault *vmf)
3021 {
3022 struct snd_pcm_substream *substream = area->vm_private_data;
3023 struct snd_pcm_runtime *runtime;
3024
3025 if (substream == NULL)
3026 return VM_FAULT_SIGBUS;
3027 runtime = substream->runtime;
3028 vmf->page = virt_to_page(runtime->control);
3029 get_page(vmf->page);
3030 return 0;
3031 }
3032
3033 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3034 {
3035 .fault = snd_pcm_mmap_control_fault,
3036 };
3037
3038 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3039 struct vm_area_struct *area)
3040 {
3041 struct snd_pcm_runtime *runtime;
3042 long size;
3043 if (!(area->vm_flags & VM_READ))
3044 return -EINVAL;
3045 runtime = substream->runtime;
3046 size = area->vm_end - area->vm_start;
3047 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3048 return -EINVAL;
3049 area->vm_ops = &snd_pcm_vm_ops_control;
3050 area->vm_private_data = substream;
3051 area->vm_flags |= VM_RESERVED;
3052 return 0;
3053 }
3054 #else /* ! coherent mmap */
3055 /*
3056 * don't support mmap for status and control records.
3057 */
3058 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3059 struct vm_area_struct *area)
3060 {
3061 return -ENXIO;
3062 }
3063 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3064 struct vm_area_struct *area)
3065 {
3066 return -ENXIO;
3067 }
3068 #endif /* coherent mmap */
3069
3070 static inline struct page *
3071 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3072 {
3073 void *vaddr = substream->runtime->dma_area + ofs;
3074 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3075 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3076 return virt_to_page(CAC_ADDR(vaddr));
3077 #endif
3078 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3079 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3080 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3081 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3082 /* assume dma_handle set via pfn_to_phys() in
3083 * mm/dma-noncoherent.c
3084 */
3085 return pfn_to_page(addr >> PAGE_SHIFT);
3086 }
3087 #endif
3088 return virt_to_page(vaddr);
3089 }
3090
3091 /*
3092 * fault callback for mmapping a RAM page
3093 */
3094 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3095 struct vm_fault *vmf)
3096 {
3097 struct snd_pcm_substream *substream = area->vm_private_data;
3098 struct snd_pcm_runtime *runtime;
3099 unsigned long offset;
3100 struct page * page;
3101 size_t dma_bytes;
3102
3103 if (substream == NULL)
3104 return VM_FAULT_SIGBUS;
3105 runtime = substream->runtime;
3106 offset = vmf->pgoff << PAGE_SHIFT;
3107 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3108 if (offset > dma_bytes - PAGE_SIZE)
3109 return VM_FAULT_SIGBUS;
3110 if (substream->ops->page)
3111 page = substream->ops->page(substream, offset);
3112 else
3113 page = snd_pcm_default_page_ops(substream, offset);
3114 if (!page)
3115 return VM_FAULT_SIGBUS;
3116 get_page(page);
3117 vmf->page = page;
3118 return 0;
3119 }
3120
3121 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3122 .open = snd_pcm_mmap_data_open,
3123 .close = snd_pcm_mmap_data_close,
3124 };
3125
3126 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3127 .open = snd_pcm_mmap_data_open,
3128 .close = snd_pcm_mmap_data_close,
3129 .fault = snd_pcm_mmap_data_fault,
3130 };
3131
3132 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3133 /* This should be defined / handled globally! */
3134 #ifdef CONFIG_ARM
3135 #define ARCH_HAS_DMA_MMAP_COHERENT
3136 #endif
3137 #endif
3138
3139 /*
3140 * mmap the DMA buffer on RAM
3141 */
3142 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3143 struct vm_area_struct *area)
3144 {
3145 area->vm_flags |= VM_RESERVED;
3146 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3147 if (!substream->ops->page &&
3148 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3149 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3150 area,
3151 substream->runtime->dma_area,
3152 substream->runtime->dma_addr,
3153 area->vm_end - area->vm_start);
3154 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3155 /* mmap with fault handler */
3156 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3157 return 0;
3158 }
3159
3160 /*
3161 * mmap the DMA buffer on I/O memory area
3162 */
3163 #if SNDRV_PCM_INFO_MMAP_IOMEM
3164 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3165 struct vm_area_struct *area)
3166 {
3167 long size;
3168 unsigned long offset;
3169
3170 #ifdef pgprot_noncached
3171 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3172 #endif
3173 area->vm_flags |= VM_IO;
3174 size = area->vm_end - area->vm_start;
3175 offset = area->vm_pgoff << PAGE_SHIFT;
3176 if (io_remap_pfn_range(area, area->vm_start,
3177 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3178 size, area->vm_page_prot))
3179 return -EAGAIN;
3180 return 0;
3181 }
3182
3183 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3184 #endif /* SNDRV_PCM_INFO_MMAP */
3185
3186 /*
3187 * mmap DMA buffer
3188 */
3189 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3190 struct vm_area_struct *area)
3191 {
3192 struct snd_pcm_runtime *runtime;
3193 long size;
3194 unsigned long offset;
3195 size_t dma_bytes;
3196 int err;
3197
3198 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3199 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3200 return -EINVAL;
3201 } else {
3202 if (!(area->vm_flags & VM_READ))
3203 return -EINVAL;
3204 }
3205 runtime = substream->runtime;
3206 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3207 return -EBADFD;
3208 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3209 return -ENXIO;
3210 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3211 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3212 return -EINVAL;
3213 size = area->vm_end - area->vm_start;
3214 offset = area->vm_pgoff << PAGE_SHIFT;
3215 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3216 if ((size_t)size > dma_bytes)
3217 return -EINVAL;
3218 if (offset > dma_bytes - size)
3219 return -EINVAL;
3220
3221 area->vm_ops = &snd_pcm_vm_ops_data;
3222 area->vm_private_data = substream;
3223 if (substream->ops->mmap)
3224 err = substream->ops->mmap(substream, area);
3225 else
3226 err = snd_pcm_default_mmap(substream, area);
3227 if (!err)
3228 atomic_inc(&substream->mmap_count);
3229 return err;
3230 }
3231
3232 EXPORT_SYMBOL(snd_pcm_mmap_data);
3233
3234 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3235 {
3236 struct snd_pcm_file * pcm_file;
3237 struct snd_pcm_substream *substream;
3238 unsigned long offset;
3239
3240 pcm_file = file->private_data;
3241 substream = pcm_file->substream;
3242 if (PCM_RUNTIME_CHECK(substream))
3243 return -ENXIO;
3244
3245 offset = area->vm_pgoff << PAGE_SHIFT;
3246 switch (offset) {
3247 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3248 if (pcm_file->no_compat_mmap)
3249 return -ENXIO;
3250 return snd_pcm_mmap_status(substream, file, area);
3251 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3252 if (pcm_file->no_compat_mmap)
3253 return -ENXIO;
3254 return snd_pcm_mmap_control(substream, file, area);
3255 default:
3256 return snd_pcm_mmap_data(substream, file, area);
3257 }
3258 return 0;
3259 }
3260
3261 static int snd_pcm_fasync(int fd, struct file * file, int on)
3262 {
3263 struct snd_pcm_file * pcm_file;
3264 struct snd_pcm_substream *substream;
3265 struct snd_pcm_runtime *runtime;
3266 int err = -ENXIO;
3267
3268 lock_kernel();
3269 pcm_file = file->private_data;
3270 substream = pcm_file->substream;
3271 if (PCM_RUNTIME_CHECK(substream))
3272 goto out;
3273 runtime = substream->runtime;
3274 err = fasync_helper(fd, file, on, &runtime->fasync);
3275 out:
3276 unlock_kernel();
3277 return err;
3278 }
3279
3280 /*
3281 * ioctl32 compat
3282 */
3283 #ifdef CONFIG_COMPAT
3284 #include "pcm_compat.c"
3285 #else
3286 #define snd_pcm_ioctl_compat NULL
3287 #endif
3288
3289 /*
3290 * To be removed helpers to keep binary compatibility
3291 */
3292
3293 #ifdef CONFIG_SND_SUPPORT_OLD_API
3294 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3295 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3296
3297 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3298 struct snd_pcm_hw_params_old *oparams)
3299 {
3300 unsigned int i;
3301
3302 memset(params, 0, sizeof(*params));
3303 params->flags = oparams->flags;
3304 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3305 params->masks[i].bits[0] = oparams->masks[i];
3306 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3307 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3308 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3309 params->info = oparams->info;
3310 params->msbits = oparams->msbits;
3311 params->rate_num = oparams->rate_num;
3312 params->rate_den = oparams->rate_den;
3313 params->fifo_size = oparams->fifo_size;
3314 }
3315
3316 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3317 struct snd_pcm_hw_params *params)
3318 {
3319 unsigned int i;
3320
3321 memset(oparams, 0, sizeof(*oparams));
3322 oparams->flags = params->flags;
3323 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3324 oparams->masks[i] = params->masks[i].bits[0];
3325 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3326 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3327 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3328 oparams->info = params->info;
3329 oparams->msbits = params->msbits;
3330 oparams->rate_num = params->rate_num;
3331 oparams->rate_den = params->rate_den;
3332 oparams->fifo_size = params->fifo_size;
3333 }
3334
3335 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3336 struct snd_pcm_hw_params_old __user * _oparams)
3337 {
3338 struct snd_pcm_hw_params *params;
3339 struct snd_pcm_hw_params_old *oparams = NULL;
3340 int err;
3341
3342 params = kmalloc(sizeof(*params), GFP_KERNEL);
3343 if (!params)
3344 return -ENOMEM;
3345
3346 oparams = memdup_user(_oparams, sizeof(*oparams));
3347 if (IS_ERR(oparams)) {
3348 err = PTR_ERR(oparams);
3349 goto out;
3350 }
3351 snd_pcm_hw_convert_from_old_params(params, oparams);
3352 err = snd_pcm_hw_refine(substream, params);
3353 snd_pcm_hw_convert_to_old_params(oparams, params);
3354 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3355 if (!err)
3356 err = -EFAULT;
3357 }
3358
3359 kfree(oparams);
3360 out:
3361 kfree(params);
3362 return err;
3363 }
3364
3365 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3366 struct snd_pcm_hw_params_old __user * _oparams)
3367 {
3368 struct snd_pcm_hw_params *params;
3369 struct snd_pcm_hw_params_old *oparams = NULL;
3370 int err;
3371
3372 params = kmalloc(sizeof(*params), GFP_KERNEL);
3373 if (!params)
3374 return -ENOMEM;
3375
3376 oparams = memdup_user(_oparams, sizeof(*oparams));
3377 if (IS_ERR(oparams)) {
3378 err = PTR_ERR(oparams);
3379 goto out;
3380 }
3381 snd_pcm_hw_convert_from_old_params(params, oparams);
3382 err = snd_pcm_hw_params(substream, params);
3383 snd_pcm_hw_convert_to_old_params(oparams, params);
3384 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3385 if (!err)
3386 err = -EFAULT;
3387 }
3388
3389 kfree(oparams);
3390 out:
3391 kfree(params);
3392 return err;
3393 }
3394 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3395
3396 #ifndef CONFIG_MMU
3397 unsigned long dummy_get_unmapped_area(struct file *file, unsigned long addr,
3398 unsigned long len, unsigned long pgoff,
3399 unsigned long flags)
3400 {
3401 return 0;
3402 }
3403 #else
3404 # define dummy_get_unmapped_area NULL
3405 #endif
3406
3407 /*
3408 * Register section
3409 */
3410
3411 const struct file_operations snd_pcm_f_ops[2] = {
3412 {
3413 .owner = THIS_MODULE,
3414 .write = snd_pcm_write,
3415 .aio_write = snd_pcm_aio_write,
3416 .open = snd_pcm_playback_open,
3417 .release = snd_pcm_release,
3418 .poll = snd_pcm_playback_poll,
3419 .unlocked_ioctl = snd_pcm_playback_ioctl,
3420 .compat_ioctl = snd_pcm_ioctl_compat,
3421 .mmap = snd_pcm_mmap,
3422 .fasync = snd_pcm_fasync,
3423 .get_unmapped_area = dummy_get_unmapped_area,
3424 },
3425 {
3426 .owner = THIS_MODULE,
3427 .read = snd_pcm_read,
3428 .aio_read = snd_pcm_aio_read,
3429 .open = snd_pcm_capture_open,
3430 .release = snd_pcm_release,
3431 .poll = snd_pcm_capture_poll,
3432 .unlocked_ioctl = snd_pcm_capture_ioctl,
3433 .compat_ioctl = snd_pcm_ioctl_compat,
3434 .mmap = snd_pcm_mmap,
3435 .fasync = snd_pcm_fasync,
3436 .get_unmapped_area = dummy_get_unmapped_area,
3437 }
3438 };
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