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ARM: 7709/1: mcpm: Add explicit AFLAGS to support v6/v7 multiplatform kernels
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / sound / core / pcm_native.c
1 /*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/mm.h>
23 #include <linux/module.h>
24 #include <linux/file.h>
25 #include <linux/slab.h>
26 #include <linux/time.h>
27 #include <linux/pm_qos.h>
28 #include <linux/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 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
39 #include <dma-coherence.h>
40 #endif
41
42 /*
43 * Compatibility
44 */
45
46 struct snd_pcm_hw_params_old {
47 unsigned int flags;
48 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
49 SNDRV_PCM_HW_PARAM_ACCESS + 1];
50 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
51 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
52 unsigned int rmask;
53 unsigned int cmask;
54 unsigned int info;
55 unsigned int msbits;
56 unsigned int rate_num;
57 unsigned int rate_den;
58 snd_pcm_uframes_t fifo_size;
59 unsigned char reserved[64];
60 };
61
62 #ifdef CONFIG_SND_SUPPORT_OLD_API
63 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
64 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
65
66 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
67 struct snd_pcm_hw_params_old __user * _oparams);
68 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
69 struct snd_pcm_hw_params_old __user * _oparams);
70 #endif
71 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
72
73 /*
74 *
75 */
76
77 DEFINE_RWLOCK(snd_pcm_link_rwlock);
78 EXPORT_SYMBOL(snd_pcm_link_rwlock);
79
80 static DECLARE_RWSEM(snd_pcm_link_rwsem);
81
82 static inline mm_segment_t snd_enter_user(void)
83 {
84 mm_segment_t fs = get_fs();
85 set_fs(get_ds());
86 return fs;
87 }
88
89 static inline void snd_leave_user(mm_segment_t fs)
90 {
91 set_fs(fs);
92 }
93
94
95
96 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
97 {
98 struct snd_pcm_runtime *runtime;
99 struct snd_pcm *pcm = substream->pcm;
100 struct snd_pcm_str *pstr = substream->pstr;
101
102 memset(info, 0, sizeof(*info));
103 info->card = pcm->card->number;
104 info->device = pcm->device;
105 info->stream = substream->stream;
106 info->subdevice = substream->number;
107 strlcpy(info->id, pcm->id, sizeof(info->id));
108 strlcpy(info->name, pcm->name, sizeof(info->name));
109 info->dev_class = pcm->dev_class;
110 info->dev_subclass = pcm->dev_subclass;
111 info->subdevices_count = pstr->substream_count;
112 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
113 strlcpy(info->subname, substream->name, sizeof(info->subname));
114 runtime = substream->runtime;
115 /* AB: FIXME!!! This is definitely nonsense */
116 if (runtime) {
117 info->sync = runtime->sync;
118 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
119 }
120 return 0;
121 }
122
123 int snd_pcm_info_user(struct snd_pcm_substream *substream,
124 struct snd_pcm_info __user * _info)
125 {
126 struct snd_pcm_info *info;
127 int err;
128
129 info = kmalloc(sizeof(*info), GFP_KERNEL);
130 if (! info)
131 return -ENOMEM;
132 err = snd_pcm_info(substream, info);
133 if (err >= 0) {
134 if (copy_to_user(_info, info, sizeof(*info)))
135 err = -EFAULT;
136 }
137 kfree(info);
138 return err;
139 }
140
141 #undef RULES_DEBUG
142
143 #ifdef RULES_DEBUG
144 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
145 static const char * const snd_pcm_hw_param_names[] = {
146 HW_PARAM(ACCESS),
147 HW_PARAM(FORMAT),
148 HW_PARAM(SUBFORMAT),
149 HW_PARAM(SAMPLE_BITS),
150 HW_PARAM(FRAME_BITS),
151 HW_PARAM(CHANNELS),
152 HW_PARAM(RATE),
153 HW_PARAM(PERIOD_TIME),
154 HW_PARAM(PERIOD_SIZE),
155 HW_PARAM(PERIOD_BYTES),
156 HW_PARAM(PERIODS),
157 HW_PARAM(BUFFER_TIME),
158 HW_PARAM(BUFFER_SIZE),
159 HW_PARAM(BUFFER_BYTES),
160 HW_PARAM(TICK_TIME),
161 };
162 #endif
163
164 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
165 struct snd_pcm_hw_params *params)
166 {
167 unsigned int k;
168 struct snd_pcm_hardware *hw;
169 struct snd_interval *i = NULL;
170 struct snd_mask *m = NULL;
171 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
172 unsigned int rstamps[constrs->rules_num];
173 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
174 unsigned int stamp = 2;
175 int changed, again;
176
177 params->info = 0;
178 params->fifo_size = 0;
179 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
180 params->msbits = 0;
181 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
182 params->rate_num = 0;
183 params->rate_den = 0;
184 }
185
186 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
187 m = hw_param_mask(params, k);
188 if (snd_mask_empty(m))
189 return -EINVAL;
190 if (!(params->rmask & (1 << k)))
191 continue;
192 #ifdef RULES_DEBUG
193 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
194 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
195 #endif
196 changed = snd_mask_refine(m, constrs_mask(constrs, k));
197 #ifdef RULES_DEBUG
198 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
199 #endif
200 if (changed)
201 params->cmask |= 1 << k;
202 if (changed < 0)
203 return changed;
204 }
205
206 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
207 i = hw_param_interval(params, k);
208 if (snd_interval_empty(i))
209 return -EINVAL;
210 if (!(params->rmask & (1 << k)))
211 continue;
212 #ifdef RULES_DEBUG
213 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
214 if (i->empty)
215 printk("empty");
216 else
217 printk("%c%u %u%c",
218 i->openmin ? '(' : '[', i->min,
219 i->max, i->openmax ? ')' : ']');
220 printk(" -> ");
221 #endif
222 changed = snd_interval_refine(i, constrs_interval(constrs, k));
223 #ifdef RULES_DEBUG
224 if (i->empty)
225 printk("empty\n");
226 else
227 printk("%c%u %u%c\n",
228 i->openmin ? '(' : '[', i->min,
229 i->max, i->openmax ? ')' : ']');
230 #endif
231 if (changed)
232 params->cmask |= 1 << k;
233 if (changed < 0)
234 return changed;
235 }
236
237 for (k = 0; k < constrs->rules_num; k++)
238 rstamps[k] = 0;
239 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
240 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
241 do {
242 again = 0;
243 for (k = 0; k < constrs->rules_num; k++) {
244 struct snd_pcm_hw_rule *r = &constrs->rules[k];
245 unsigned int d;
246 int doit = 0;
247 if (r->cond && !(r->cond & params->flags))
248 continue;
249 for (d = 0; r->deps[d] >= 0; d++) {
250 if (vstamps[r->deps[d]] > rstamps[k]) {
251 doit = 1;
252 break;
253 }
254 }
255 if (!doit)
256 continue;
257 #ifdef RULES_DEBUG
258 printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
259 if (r->var >= 0) {
260 printk("%s = ", snd_pcm_hw_param_names[r->var]);
261 if (hw_is_mask(r->var)) {
262 m = hw_param_mask(params, r->var);
263 printk("%x", *m->bits);
264 } else {
265 i = hw_param_interval(params, r->var);
266 if (i->empty)
267 printk("empty");
268 else
269 printk("%c%u %u%c",
270 i->openmin ? '(' : '[', i->min,
271 i->max, i->openmax ? ')' : ']');
272 }
273 }
274 #endif
275 changed = r->func(params, r);
276 #ifdef RULES_DEBUG
277 if (r->var >= 0) {
278 printk(" -> ");
279 if (hw_is_mask(r->var))
280 printk("%x", *m->bits);
281 else {
282 if (i->empty)
283 printk("empty");
284 else
285 printk("%c%u %u%c",
286 i->openmin ? '(' : '[', i->min,
287 i->max, i->openmax ? ')' : ']');
288 }
289 }
290 printk("\n");
291 #endif
292 rstamps[k] = stamp;
293 if (changed && r->var >= 0) {
294 params->cmask |= (1 << r->var);
295 vstamps[r->var] = stamp;
296 again = 1;
297 }
298 if (changed < 0)
299 return changed;
300 stamp++;
301 }
302 } while (again);
303 if (!params->msbits) {
304 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
305 if (snd_interval_single(i))
306 params->msbits = snd_interval_value(i);
307 }
308
309 if (!params->rate_den) {
310 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
311 if (snd_interval_single(i)) {
312 params->rate_num = snd_interval_value(i);
313 params->rate_den = 1;
314 }
315 }
316
317 hw = &substream->runtime->hw;
318 if (!params->info)
319 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
320 if (!params->fifo_size) {
321 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
322 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
323 if (snd_mask_min(m) == snd_mask_max(m) &&
324 snd_interval_min(i) == snd_interval_max(i)) {
325 changed = substream->ops->ioctl(substream,
326 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
327 if (changed < 0)
328 return changed;
329 }
330 }
331 params->rmask = 0;
332 return 0;
333 }
334
335 EXPORT_SYMBOL(snd_pcm_hw_refine);
336
337 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
338 struct snd_pcm_hw_params __user * _params)
339 {
340 struct snd_pcm_hw_params *params;
341 int err;
342
343 params = memdup_user(_params, sizeof(*params));
344 if (IS_ERR(params))
345 return PTR_ERR(params);
346
347 err = snd_pcm_hw_refine(substream, params);
348 if (copy_to_user(_params, params, sizeof(*params))) {
349 if (!err)
350 err = -EFAULT;
351 }
352
353 kfree(params);
354 return err;
355 }
356
357 static int period_to_usecs(struct snd_pcm_runtime *runtime)
358 {
359 int usecs;
360
361 if (! runtime->rate)
362 return -1; /* invalid */
363
364 /* take 75% of period time as the deadline */
365 usecs = (750000 / runtime->rate) * runtime->period_size;
366 usecs += ((750000 % runtime->rate) * runtime->period_size) /
367 runtime->rate;
368
369 return usecs;
370 }
371
372 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
373 {
374 snd_pcm_stream_lock_irq(substream);
375 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
376 substream->runtime->status->state = state;
377 snd_pcm_stream_unlock_irq(substream);
378 }
379
380 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
381 struct snd_pcm_hw_params *params)
382 {
383 struct snd_pcm_runtime *runtime;
384 int err, usecs;
385 unsigned int bits;
386 snd_pcm_uframes_t frames;
387
388 if (PCM_RUNTIME_CHECK(substream))
389 return -ENXIO;
390 runtime = substream->runtime;
391 snd_pcm_stream_lock_irq(substream);
392 switch (runtime->status->state) {
393 case SNDRV_PCM_STATE_OPEN:
394 case SNDRV_PCM_STATE_SETUP:
395 case SNDRV_PCM_STATE_PREPARED:
396 break;
397 default:
398 snd_pcm_stream_unlock_irq(substream);
399 return -EBADFD;
400 }
401 snd_pcm_stream_unlock_irq(substream);
402 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
403 if (!substream->oss.oss)
404 #endif
405 if (atomic_read(&substream->mmap_count))
406 return -EBADFD;
407
408 params->rmask = ~0U;
409 err = snd_pcm_hw_refine(substream, params);
410 if (err < 0)
411 goto _error;
412
413 err = snd_pcm_hw_params_choose(substream, params);
414 if (err < 0)
415 goto _error;
416
417 if (substream->ops->hw_params != NULL) {
418 err = substream->ops->hw_params(substream, params);
419 if (err < 0)
420 goto _error;
421 }
422
423 runtime->access = params_access(params);
424 runtime->format = params_format(params);
425 runtime->subformat = params_subformat(params);
426 runtime->channels = params_channels(params);
427 runtime->rate = params_rate(params);
428 runtime->period_size = params_period_size(params);
429 runtime->periods = params_periods(params);
430 runtime->buffer_size = params_buffer_size(params);
431 runtime->info = params->info;
432 runtime->rate_num = params->rate_num;
433 runtime->rate_den = params->rate_den;
434 runtime->no_period_wakeup =
435 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
436 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
437
438 bits = snd_pcm_format_physical_width(runtime->format);
439 runtime->sample_bits = bits;
440 bits *= runtime->channels;
441 runtime->frame_bits = bits;
442 frames = 1;
443 while (bits % 8 != 0) {
444 bits *= 2;
445 frames *= 2;
446 }
447 runtime->byte_align = bits / 8;
448 runtime->min_align = frames;
449
450 /* Default sw params */
451 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
452 runtime->period_step = 1;
453 runtime->control->avail_min = runtime->period_size;
454 runtime->start_threshold = 1;
455 runtime->stop_threshold = runtime->buffer_size;
456 runtime->silence_threshold = 0;
457 runtime->silence_size = 0;
458 runtime->boundary = runtime->buffer_size;
459 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
460 runtime->boundary *= 2;
461
462 snd_pcm_timer_resolution_change(substream);
463 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
464
465 if (pm_qos_request_active(&substream->latency_pm_qos_req))
466 pm_qos_remove_request(&substream->latency_pm_qos_req);
467 if ((usecs = period_to_usecs(runtime)) >= 0)
468 pm_qos_add_request(&substream->latency_pm_qos_req,
469 PM_QOS_CPU_DMA_LATENCY, usecs);
470 return 0;
471 _error:
472 /* hardware might be unusable from this time,
473 so we force application to retry to set
474 the correct hardware parameter settings */
475 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
476 if (substream->ops->hw_free != NULL)
477 substream->ops->hw_free(substream);
478 return err;
479 }
480
481 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
482 struct snd_pcm_hw_params __user * _params)
483 {
484 struct snd_pcm_hw_params *params;
485 int err;
486
487 params = memdup_user(_params, sizeof(*params));
488 if (IS_ERR(params))
489 return PTR_ERR(params);
490
491 err = snd_pcm_hw_params(substream, params);
492 if (copy_to_user(_params, params, sizeof(*params))) {
493 if (!err)
494 err = -EFAULT;
495 }
496
497 kfree(params);
498 return err;
499 }
500
501 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
502 {
503 struct snd_pcm_runtime *runtime;
504 int result = 0;
505
506 if (PCM_RUNTIME_CHECK(substream))
507 return -ENXIO;
508 runtime = substream->runtime;
509 snd_pcm_stream_lock_irq(substream);
510 switch (runtime->status->state) {
511 case SNDRV_PCM_STATE_SETUP:
512 case SNDRV_PCM_STATE_PREPARED:
513 break;
514 default:
515 snd_pcm_stream_unlock_irq(substream);
516 return -EBADFD;
517 }
518 snd_pcm_stream_unlock_irq(substream);
519 if (atomic_read(&substream->mmap_count))
520 return -EBADFD;
521 if (substream->ops->hw_free)
522 result = substream->ops->hw_free(substream);
523 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
524 pm_qos_remove_request(&substream->latency_pm_qos_req);
525 return result;
526 }
527
528 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
529 struct snd_pcm_sw_params *params)
530 {
531 struct snd_pcm_runtime *runtime;
532 int err;
533
534 if (PCM_RUNTIME_CHECK(substream))
535 return -ENXIO;
536 runtime = substream->runtime;
537 snd_pcm_stream_lock_irq(substream);
538 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
539 snd_pcm_stream_unlock_irq(substream);
540 return -EBADFD;
541 }
542 snd_pcm_stream_unlock_irq(substream);
543
544 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
545 return -EINVAL;
546 if (params->avail_min == 0)
547 return -EINVAL;
548 if (params->silence_size >= runtime->boundary) {
549 if (params->silence_threshold != 0)
550 return -EINVAL;
551 } else {
552 if (params->silence_size > params->silence_threshold)
553 return -EINVAL;
554 if (params->silence_threshold > runtime->buffer_size)
555 return -EINVAL;
556 }
557 err = 0;
558 snd_pcm_stream_lock_irq(substream);
559 runtime->tstamp_mode = params->tstamp_mode;
560 runtime->period_step = params->period_step;
561 runtime->control->avail_min = params->avail_min;
562 runtime->start_threshold = params->start_threshold;
563 runtime->stop_threshold = params->stop_threshold;
564 runtime->silence_threshold = params->silence_threshold;
565 runtime->silence_size = params->silence_size;
566 params->boundary = runtime->boundary;
567 if (snd_pcm_running(substream)) {
568 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
569 runtime->silence_size > 0)
570 snd_pcm_playback_silence(substream, ULONG_MAX);
571 err = snd_pcm_update_state(substream, runtime);
572 }
573 snd_pcm_stream_unlock_irq(substream);
574 return err;
575 }
576
577 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
578 struct snd_pcm_sw_params __user * _params)
579 {
580 struct snd_pcm_sw_params params;
581 int err;
582 if (copy_from_user(&params, _params, sizeof(params)))
583 return -EFAULT;
584 err = snd_pcm_sw_params(substream, &params);
585 if (copy_to_user(_params, &params, sizeof(params)))
586 return -EFAULT;
587 return err;
588 }
589
590 int snd_pcm_status(struct snd_pcm_substream *substream,
591 struct snd_pcm_status *status)
592 {
593 struct snd_pcm_runtime *runtime = substream->runtime;
594
595 snd_pcm_stream_lock_irq(substream);
596 status->state = runtime->status->state;
597 status->suspended_state = runtime->status->suspended_state;
598 if (status->state == SNDRV_PCM_STATE_OPEN)
599 goto _end;
600 status->trigger_tstamp = runtime->trigger_tstamp;
601 if (snd_pcm_running(substream)) {
602 snd_pcm_update_hw_ptr(substream);
603 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
604 status->tstamp = runtime->status->tstamp;
605 status->audio_tstamp =
606 runtime->status->audio_tstamp;
607 goto _tstamp_end;
608 }
609 }
610 snd_pcm_gettime(runtime, &status->tstamp);
611 _tstamp_end:
612 status->appl_ptr = runtime->control->appl_ptr;
613 status->hw_ptr = runtime->status->hw_ptr;
614 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
615 status->avail = snd_pcm_playback_avail(runtime);
616 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
617 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
618 status->delay = runtime->buffer_size - status->avail;
619 status->delay += runtime->delay;
620 } else
621 status->delay = 0;
622 } else {
623 status->avail = snd_pcm_capture_avail(runtime);
624 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
625 status->delay = status->avail + runtime->delay;
626 else
627 status->delay = 0;
628 }
629 status->avail_max = runtime->avail_max;
630 status->overrange = runtime->overrange;
631 runtime->avail_max = 0;
632 runtime->overrange = 0;
633 _end:
634 snd_pcm_stream_unlock_irq(substream);
635 return 0;
636 }
637
638 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
639 struct snd_pcm_status __user * _status)
640 {
641 struct snd_pcm_status status;
642 int res;
643
644 memset(&status, 0, sizeof(status));
645 res = snd_pcm_status(substream, &status);
646 if (res < 0)
647 return res;
648 if (copy_to_user(_status, &status, sizeof(status)))
649 return -EFAULT;
650 return 0;
651 }
652
653 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
654 struct snd_pcm_channel_info * info)
655 {
656 struct snd_pcm_runtime *runtime;
657 unsigned int channel;
658
659 channel = info->channel;
660 runtime = substream->runtime;
661 snd_pcm_stream_lock_irq(substream);
662 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
663 snd_pcm_stream_unlock_irq(substream);
664 return -EBADFD;
665 }
666 snd_pcm_stream_unlock_irq(substream);
667 if (channel >= runtime->channels)
668 return -EINVAL;
669 memset(info, 0, sizeof(*info));
670 info->channel = channel;
671 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
672 }
673
674 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
675 struct snd_pcm_channel_info __user * _info)
676 {
677 struct snd_pcm_channel_info info;
678 int res;
679
680 if (copy_from_user(&info, _info, sizeof(info)))
681 return -EFAULT;
682 res = snd_pcm_channel_info(substream, &info);
683 if (res < 0)
684 return res;
685 if (copy_to_user(_info, &info, sizeof(info)))
686 return -EFAULT;
687 return 0;
688 }
689
690 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
691 {
692 struct snd_pcm_runtime *runtime = substream->runtime;
693 if (runtime->trigger_master == NULL)
694 return;
695 if (runtime->trigger_master == substream) {
696 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
697 } else {
698 snd_pcm_trigger_tstamp(runtime->trigger_master);
699 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
700 }
701 runtime->trigger_master = NULL;
702 }
703
704 struct action_ops {
705 int (*pre_action)(struct snd_pcm_substream *substream, int state);
706 int (*do_action)(struct snd_pcm_substream *substream, int state);
707 void (*undo_action)(struct snd_pcm_substream *substream, int state);
708 void (*post_action)(struct snd_pcm_substream *substream, int state);
709 };
710
711 /*
712 * this functions is core for handling of linked stream
713 * Note: the stream state might be changed also on failure
714 * Note2: call with calling stream lock + link lock
715 */
716 static int snd_pcm_action_group(struct action_ops *ops,
717 struct snd_pcm_substream *substream,
718 int state, int do_lock)
719 {
720 struct snd_pcm_substream *s = NULL;
721 struct snd_pcm_substream *s1;
722 int res = 0;
723
724 snd_pcm_group_for_each_entry(s, substream) {
725 if (do_lock && s != substream)
726 spin_lock_nested(&s->self_group.lock,
727 SINGLE_DEPTH_NESTING);
728 res = ops->pre_action(s, state);
729 if (res < 0)
730 goto _unlock;
731 }
732 snd_pcm_group_for_each_entry(s, substream) {
733 res = ops->do_action(s, state);
734 if (res < 0) {
735 if (ops->undo_action) {
736 snd_pcm_group_for_each_entry(s1, substream) {
737 if (s1 == s) /* failed stream */
738 break;
739 ops->undo_action(s1, state);
740 }
741 }
742 s = NULL; /* unlock all */
743 goto _unlock;
744 }
745 }
746 snd_pcm_group_for_each_entry(s, substream) {
747 ops->post_action(s, state);
748 }
749 _unlock:
750 if (do_lock) {
751 /* unlock streams */
752 snd_pcm_group_for_each_entry(s1, substream) {
753 if (s1 != substream)
754 spin_unlock(&s1->self_group.lock);
755 if (s1 == s) /* end */
756 break;
757 }
758 }
759 return res;
760 }
761
762 /*
763 * Note: call with stream lock
764 */
765 static int snd_pcm_action_single(struct action_ops *ops,
766 struct snd_pcm_substream *substream,
767 int state)
768 {
769 int res;
770
771 res = ops->pre_action(substream, state);
772 if (res < 0)
773 return res;
774 res = ops->do_action(substream, state);
775 if (res == 0)
776 ops->post_action(substream, state);
777 else if (ops->undo_action)
778 ops->undo_action(substream, state);
779 return res;
780 }
781
782 /*
783 * Note: call with stream lock
784 */
785 static int snd_pcm_action(struct action_ops *ops,
786 struct snd_pcm_substream *substream,
787 int state)
788 {
789 int res;
790
791 if (snd_pcm_stream_linked(substream)) {
792 if (!spin_trylock(&substream->group->lock)) {
793 spin_unlock(&substream->self_group.lock);
794 spin_lock(&substream->group->lock);
795 spin_lock(&substream->self_group.lock);
796 }
797 res = snd_pcm_action_group(ops, substream, state, 1);
798 spin_unlock(&substream->group->lock);
799 } else {
800 res = snd_pcm_action_single(ops, substream, state);
801 }
802 return res;
803 }
804
805 /*
806 * Note: don't use any locks before
807 */
808 static int snd_pcm_action_lock_irq(struct action_ops *ops,
809 struct snd_pcm_substream *substream,
810 int state)
811 {
812 int res;
813
814 read_lock_irq(&snd_pcm_link_rwlock);
815 if (snd_pcm_stream_linked(substream)) {
816 spin_lock(&substream->group->lock);
817 spin_lock(&substream->self_group.lock);
818 res = snd_pcm_action_group(ops, substream, state, 1);
819 spin_unlock(&substream->self_group.lock);
820 spin_unlock(&substream->group->lock);
821 } else {
822 spin_lock(&substream->self_group.lock);
823 res = snd_pcm_action_single(ops, substream, state);
824 spin_unlock(&substream->self_group.lock);
825 }
826 read_unlock_irq(&snd_pcm_link_rwlock);
827 return res;
828 }
829
830 /*
831 */
832 static int snd_pcm_action_nonatomic(struct action_ops *ops,
833 struct snd_pcm_substream *substream,
834 int state)
835 {
836 int res;
837
838 down_read(&snd_pcm_link_rwsem);
839 if (snd_pcm_stream_linked(substream))
840 res = snd_pcm_action_group(ops, substream, state, 0);
841 else
842 res = snd_pcm_action_single(ops, substream, state);
843 up_read(&snd_pcm_link_rwsem);
844 return res;
845 }
846
847 /*
848 * start callbacks
849 */
850 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
851 {
852 struct snd_pcm_runtime *runtime = substream->runtime;
853 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
854 return -EBADFD;
855 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
856 !snd_pcm_playback_data(substream))
857 return -EPIPE;
858 runtime->trigger_master = substream;
859 return 0;
860 }
861
862 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
863 {
864 if (substream->runtime->trigger_master != substream)
865 return 0;
866 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
867 }
868
869 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
870 {
871 if (substream->runtime->trigger_master == substream)
872 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
873 }
874
875 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
876 {
877 struct snd_pcm_runtime *runtime = substream->runtime;
878 snd_pcm_trigger_tstamp(substream);
879 runtime->hw_ptr_jiffies = jiffies;
880 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
881 runtime->rate;
882 runtime->status->state = state;
883 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
884 runtime->silence_size > 0)
885 snd_pcm_playback_silence(substream, ULONG_MAX);
886 if (substream->timer)
887 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
888 &runtime->trigger_tstamp);
889 }
890
891 static struct action_ops snd_pcm_action_start = {
892 .pre_action = snd_pcm_pre_start,
893 .do_action = snd_pcm_do_start,
894 .undo_action = snd_pcm_undo_start,
895 .post_action = snd_pcm_post_start
896 };
897
898 /**
899 * snd_pcm_start - start all linked streams
900 * @substream: the PCM substream instance
901 */
902 int snd_pcm_start(struct snd_pcm_substream *substream)
903 {
904 return snd_pcm_action(&snd_pcm_action_start, substream,
905 SNDRV_PCM_STATE_RUNNING);
906 }
907
908 /*
909 * stop callbacks
910 */
911 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
912 {
913 struct snd_pcm_runtime *runtime = substream->runtime;
914 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
915 return -EBADFD;
916 runtime->trigger_master = substream;
917 return 0;
918 }
919
920 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
921 {
922 if (substream->runtime->trigger_master == substream &&
923 snd_pcm_running(substream))
924 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
925 return 0; /* unconditonally stop all substreams */
926 }
927
928 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
929 {
930 struct snd_pcm_runtime *runtime = substream->runtime;
931 if (runtime->status->state != state) {
932 snd_pcm_trigger_tstamp(substream);
933 if (substream->timer)
934 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
935 &runtime->trigger_tstamp);
936 runtime->status->state = state;
937 }
938 wake_up(&runtime->sleep);
939 wake_up(&runtime->tsleep);
940 }
941
942 static struct action_ops snd_pcm_action_stop = {
943 .pre_action = snd_pcm_pre_stop,
944 .do_action = snd_pcm_do_stop,
945 .post_action = snd_pcm_post_stop
946 };
947
948 /**
949 * snd_pcm_stop - try to stop all running streams in the substream group
950 * @substream: the PCM substream instance
951 * @state: PCM state after stopping the stream
952 *
953 * The state of each stream is then changed to the given state unconditionally.
954 */
955 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
956 {
957 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
958 }
959
960 EXPORT_SYMBOL(snd_pcm_stop);
961
962 /**
963 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
964 * @substream: the PCM substream
965 *
966 * After stopping, the state is changed to SETUP.
967 * Unlike snd_pcm_stop(), this affects only the given stream.
968 */
969 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
970 {
971 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
972 SNDRV_PCM_STATE_SETUP);
973 }
974
975 /*
976 * pause callbacks
977 */
978 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
979 {
980 struct snd_pcm_runtime *runtime = substream->runtime;
981 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
982 return -ENOSYS;
983 if (push) {
984 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
985 return -EBADFD;
986 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
987 return -EBADFD;
988 runtime->trigger_master = substream;
989 return 0;
990 }
991
992 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
993 {
994 if (substream->runtime->trigger_master != substream)
995 return 0;
996 /* some drivers might use hw_ptr to recover from the pause -
997 update the hw_ptr now */
998 if (push)
999 snd_pcm_update_hw_ptr(substream);
1000 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1001 * a delta between the current jiffies, this gives a large enough
1002 * delta, effectively to skip the check once.
1003 */
1004 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1005 return substream->ops->trigger(substream,
1006 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1007 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1008 }
1009
1010 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1011 {
1012 if (substream->runtime->trigger_master == substream)
1013 substream->ops->trigger(substream,
1014 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1015 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1016 }
1017
1018 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1019 {
1020 struct snd_pcm_runtime *runtime = substream->runtime;
1021 snd_pcm_trigger_tstamp(substream);
1022 if (push) {
1023 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1024 if (substream->timer)
1025 snd_timer_notify(substream->timer,
1026 SNDRV_TIMER_EVENT_MPAUSE,
1027 &runtime->trigger_tstamp);
1028 wake_up(&runtime->sleep);
1029 wake_up(&runtime->tsleep);
1030 } else {
1031 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1032 if (substream->timer)
1033 snd_timer_notify(substream->timer,
1034 SNDRV_TIMER_EVENT_MCONTINUE,
1035 &runtime->trigger_tstamp);
1036 }
1037 }
1038
1039 static struct action_ops snd_pcm_action_pause = {
1040 .pre_action = snd_pcm_pre_pause,
1041 .do_action = snd_pcm_do_pause,
1042 .undo_action = snd_pcm_undo_pause,
1043 .post_action = snd_pcm_post_pause
1044 };
1045
1046 /*
1047 * Push/release the pause for all linked streams.
1048 */
1049 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1050 {
1051 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1052 }
1053
1054 #ifdef CONFIG_PM
1055 /* suspend */
1056
1057 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1058 {
1059 struct snd_pcm_runtime *runtime = substream->runtime;
1060 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1061 return -EBUSY;
1062 runtime->trigger_master = substream;
1063 return 0;
1064 }
1065
1066 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1067 {
1068 struct snd_pcm_runtime *runtime = substream->runtime;
1069 if (runtime->trigger_master != substream)
1070 return 0;
1071 if (! snd_pcm_running(substream))
1072 return 0;
1073 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1074 return 0; /* suspend unconditionally */
1075 }
1076
1077 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1078 {
1079 struct snd_pcm_runtime *runtime = substream->runtime;
1080 snd_pcm_trigger_tstamp(substream);
1081 if (substream->timer)
1082 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1083 &runtime->trigger_tstamp);
1084 runtime->status->suspended_state = runtime->status->state;
1085 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1086 wake_up(&runtime->sleep);
1087 wake_up(&runtime->tsleep);
1088 }
1089
1090 static struct action_ops snd_pcm_action_suspend = {
1091 .pre_action = snd_pcm_pre_suspend,
1092 .do_action = snd_pcm_do_suspend,
1093 .post_action = snd_pcm_post_suspend
1094 };
1095
1096 /**
1097 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1098 * @substream: the PCM substream
1099 *
1100 * After this call, all streams are changed to SUSPENDED state.
1101 */
1102 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1103 {
1104 int err;
1105 unsigned long flags;
1106
1107 if (! substream)
1108 return 0;
1109
1110 snd_pcm_stream_lock_irqsave(substream, flags);
1111 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1112 snd_pcm_stream_unlock_irqrestore(substream, flags);
1113 return err;
1114 }
1115
1116 EXPORT_SYMBOL(snd_pcm_suspend);
1117
1118 /**
1119 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1120 * @pcm: the PCM instance
1121 *
1122 * After this call, all streams are changed to SUSPENDED state.
1123 */
1124 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1125 {
1126 struct snd_pcm_substream *substream;
1127 int stream, err = 0;
1128
1129 if (! pcm)
1130 return 0;
1131
1132 for (stream = 0; stream < 2; stream++) {
1133 for (substream = pcm->streams[stream].substream;
1134 substream; substream = substream->next) {
1135 /* FIXME: the open/close code should lock this as well */
1136 if (substream->runtime == NULL)
1137 continue;
1138 err = snd_pcm_suspend(substream);
1139 if (err < 0 && err != -EBUSY)
1140 return err;
1141 }
1142 }
1143 return 0;
1144 }
1145
1146 EXPORT_SYMBOL(snd_pcm_suspend_all);
1147
1148 /* resume */
1149
1150 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1151 {
1152 struct snd_pcm_runtime *runtime = substream->runtime;
1153 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1154 return -ENOSYS;
1155 runtime->trigger_master = substream;
1156 return 0;
1157 }
1158
1159 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1160 {
1161 struct snd_pcm_runtime *runtime = substream->runtime;
1162 if (runtime->trigger_master != substream)
1163 return 0;
1164 /* DMA not running previously? */
1165 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1166 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1167 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1168 return 0;
1169 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1170 }
1171
1172 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1173 {
1174 if (substream->runtime->trigger_master == substream &&
1175 snd_pcm_running(substream))
1176 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1177 }
1178
1179 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1180 {
1181 struct snd_pcm_runtime *runtime = substream->runtime;
1182 snd_pcm_trigger_tstamp(substream);
1183 if (substream->timer)
1184 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1185 &runtime->trigger_tstamp);
1186 runtime->status->state = runtime->status->suspended_state;
1187 }
1188
1189 static struct action_ops snd_pcm_action_resume = {
1190 .pre_action = snd_pcm_pre_resume,
1191 .do_action = snd_pcm_do_resume,
1192 .undo_action = snd_pcm_undo_resume,
1193 .post_action = snd_pcm_post_resume
1194 };
1195
1196 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1197 {
1198 struct snd_card *card = substream->pcm->card;
1199 int res;
1200
1201 snd_power_lock(card);
1202 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1203 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1204 snd_power_unlock(card);
1205 return res;
1206 }
1207
1208 #else
1209
1210 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1211 {
1212 return -ENOSYS;
1213 }
1214
1215 #endif /* CONFIG_PM */
1216
1217 /*
1218 * xrun ioctl
1219 *
1220 * Change the RUNNING stream(s) to XRUN state.
1221 */
1222 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1223 {
1224 struct snd_card *card = substream->pcm->card;
1225 struct snd_pcm_runtime *runtime = substream->runtime;
1226 int result;
1227
1228 snd_power_lock(card);
1229 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1230 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1231 if (result < 0)
1232 goto _unlock;
1233 }
1234
1235 snd_pcm_stream_lock_irq(substream);
1236 switch (runtime->status->state) {
1237 case SNDRV_PCM_STATE_XRUN:
1238 result = 0; /* already there */
1239 break;
1240 case SNDRV_PCM_STATE_RUNNING:
1241 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1242 break;
1243 default:
1244 result = -EBADFD;
1245 }
1246 snd_pcm_stream_unlock_irq(substream);
1247 _unlock:
1248 snd_power_unlock(card);
1249 return result;
1250 }
1251
1252 /*
1253 * reset ioctl
1254 */
1255 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1256 {
1257 struct snd_pcm_runtime *runtime = substream->runtime;
1258 switch (runtime->status->state) {
1259 case SNDRV_PCM_STATE_RUNNING:
1260 case SNDRV_PCM_STATE_PREPARED:
1261 case SNDRV_PCM_STATE_PAUSED:
1262 case SNDRV_PCM_STATE_SUSPENDED:
1263 return 0;
1264 default:
1265 return -EBADFD;
1266 }
1267 }
1268
1269 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1270 {
1271 struct snd_pcm_runtime *runtime = substream->runtime;
1272 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1273 if (err < 0)
1274 return err;
1275 runtime->hw_ptr_base = 0;
1276 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1277 runtime->status->hw_ptr % runtime->period_size;
1278 runtime->silence_start = runtime->status->hw_ptr;
1279 runtime->silence_filled = 0;
1280 return 0;
1281 }
1282
1283 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1284 {
1285 struct snd_pcm_runtime *runtime = substream->runtime;
1286 runtime->control->appl_ptr = runtime->status->hw_ptr;
1287 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1288 runtime->silence_size > 0)
1289 snd_pcm_playback_silence(substream, ULONG_MAX);
1290 }
1291
1292 static struct action_ops snd_pcm_action_reset = {
1293 .pre_action = snd_pcm_pre_reset,
1294 .do_action = snd_pcm_do_reset,
1295 .post_action = snd_pcm_post_reset
1296 };
1297
1298 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1299 {
1300 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1301 }
1302
1303 /*
1304 * prepare ioctl
1305 */
1306 /* we use the second argument for updating f_flags */
1307 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1308 int f_flags)
1309 {
1310 struct snd_pcm_runtime *runtime = substream->runtime;
1311 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1312 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1313 return -EBADFD;
1314 if (snd_pcm_running(substream))
1315 return -EBUSY;
1316 substream->f_flags = f_flags;
1317 return 0;
1318 }
1319
1320 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1321 {
1322 int err;
1323 err = substream->ops->prepare(substream);
1324 if (err < 0)
1325 return err;
1326 return snd_pcm_do_reset(substream, 0);
1327 }
1328
1329 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1330 {
1331 struct snd_pcm_runtime *runtime = substream->runtime;
1332 runtime->control->appl_ptr = runtime->status->hw_ptr;
1333 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1334 }
1335
1336 static struct action_ops snd_pcm_action_prepare = {
1337 .pre_action = snd_pcm_pre_prepare,
1338 .do_action = snd_pcm_do_prepare,
1339 .post_action = snd_pcm_post_prepare
1340 };
1341
1342 /**
1343 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1344 * @substream: the PCM substream instance
1345 * @file: file to refer f_flags
1346 */
1347 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1348 struct file *file)
1349 {
1350 int res;
1351 struct snd_card *card = substream->pcm->card;
1352 int f_flags;
1353
1354 if (file)
1355 f_flags = file->f_flags;
1356 else
1357 f_flags = substream->f_flags;
1358
1359 snd_power_lock(card);
1360 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1361 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1362 substream, f_flags);
1363 snd_power_unlock(card);
1364 return res;
1365 }
1366
1367 /*
1368 * drain ioctl
1369 */
1370
1371 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1372 {
1373 struct snd_pcm_runtime *runtime = substream->runtime;
1374 switch (runtime->status->state) {
1375 case SNDRV_PCM_STATE_OPEN:
1376 case SNDRV_PCM_STATE_DISCONNECTED:
1377 case SNDRV_PCM_STATE_SUSPENDED:
1378 return -EBADFD;
1379 }
1380 runtime->trigger_master = substream;
1381 return 0;
1382 }
1383
1384 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1385 {
1386 struct snd_pcm_runtime *runtime = substream->runtime;
1387 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1388 switch (runtime->status->state) {
1389 case SNDRV_PCM_STATE_PREPARED:
1390 /* start playback stream if possible */
1391 if (! snd_pcm_playback_empty(substream)) {
1392 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1393 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1394 }
1395 break;
1396 case SNDRV_PCM_STATE_RUNNING:
1397 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1398 break;
1399 case SNDRV_PCM_STATE_XRUN:
1400 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1401 break;
1402 default:
1403 break;
1404 }
1405 } else {
1406 /* stop running stream */
1407 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1408 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1409 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1410 snd_pcm_do_stop(substream, new_state);
1411 snd_pcm_post_stop(substream, new_state);
1412 }
1413 }
1414 return 0;
1415 }
1416
1417 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1418 {
1419 }
1420
1421 static struct action_ops snd_pcm_action_drain_init = {
1422 .pre_action = snd_pcm_pre_drain_init,
1423 .do_action = snd_pcm_do_drain_init,
1424 .post_action = snd_pcm_post_drain_init
1425 };
1426
1427 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1428
1429 /*
1430 * Drain the stream(s).
1431 * When the substream is linked, sync until the draining of all playback streams
1432 * is finished.
1433 * After this call, all streams are supposed to be either SETUP or DRAINING
1434 * (capture only) state.
1435 */
1436 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1437 struct file *file)
1438 {
1439 struct snd_card *card;
1440 struct snd_pcm_runtime *runtime;
1441 struct snd_pcm_substream *s;
1442 wait_queue_t wait;
1443 int result = 0;
1444 int nonblock = 0;
1445
1446 card = substream->pcm->card;
1447 runtime = substream->runtime;
1448
1449 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1450 return -EBADFD;
1451
1452 snd_power_lock(card);
1453 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1454 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1455 if (result < 0) {
1456 snd_power_unlock(card);
1457 return result;
1458 }
1459 }
1460
1461 if (file) {
1462 if (file->f_flags & O_NONBLOCK)
1463 nonblock = 1;
1464 } else if (substream->f_flags & O_NONBLOCK)
1465 nonblock = 1;
1466
1467 down_read(&snd_pcm_link_rwsem);
1468 snd_pcm_stream_lock_irq(substream);
1469 /* resume pause */
1470 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1471 snd_pcm_pause(substream, 0);
1472
1473 /* pre-start/stop - all running streams are changed to DRAINING state */
1474 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1475 if (result < 0)
1476 goto unlock;
1477 /* in non-blocking, we don't wait in ioctl but let caller poll */
1478 if (nonblock) {
1479 result = -EAGAIN;
1480 goto unlock;
1481 }
1482
1483 for (;;) {
1484 long tout;
1485 struct snd_pcm_runtime *to_check;
1486 if (signal_pending(current)) {
1487 result = -ERESTARTSYS;
1488 break;
1489 }
1490 /* find a substream to drain */
1491 to_check = NULL;
1492 snd_pcm_group_for_each_entry(s, substream) {
1493 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1494 continue;
1495 runtime = s->runtime;
1496 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1497 to_check = runtime;
1498 break;
1499 }
1500 }
1501 if (!to_check)
1502 break; /* all drained */
1503 init_waitqueue_entry(&wait, current);
1504 add_wait_queue(&to_check->sleep, &wait);
1505 snd_pcm_stream_unlock_irq(substream);
1506 up_read(&snd_pcm_link_rwsem);
1507 snd_power_unlock(card);
1508 if (runtime->no_period_wakeup)
1509 tout = MAX_SCHEDULE_TIMEOUT;
1510 else {
1511 tout = 10;
1512 if (runtime->rate) {
1513 long t = runtime->period_size * 2 / runtime->rate;
1514 tout = max(t, tout);
1515 }
1516 tout = msecs_to_jiffies(tout * 1000);
1517 }
1518 tout = schedule_timeout_interruptible(tout);
1519 snd_power_lock(card);
1520 down_read(&snd_pcm_link_rwsem);
1521 snd_pcm_stream_lock_irq(substream);
1522 remove_wait_queue(&to_check->sleep, &wait);
1523 if (card->shutdown) {
1524 result = -ENODEV;
1525 break;
1526 }
1527 if (tout == 0) {
1528 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1529 result = -ESTRPIPE;
1530 else {
1531 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1532 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1533 result = -EIO;
1534 }
1535 break;
1536 }
1537 }
1538
1539 unlock:
1540 snd_pcm_stream_unlock_irq(substream);
1541 up_read(&snd_pcm_link_rwsem);
1542 snd_power_unlock(card);
1543
1544 return result;
1545 }
1546
1547 /*
1548 * drop ioctl
1549 *
1550 * Immediately put all linked substreams into SETUP state.
1551 */
1552 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1553 {
1554 struct snd_pcm_runtime *runtime;
1555 int result = 0;
1556
1557 if (PCM_RUNTIME_CHECK(substream))
1558 return -ENXIO;
1559 runtime = substream->runtime;
1560
1561 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1562 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1563 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1564 return -EBADFD;
1565
1566 snd_pcm_stream_lock_irq(substream);
1567 /* resume pause */
1568 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1569 snd_pcm_pause(substream, 0);
1570
1571 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1572 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1573 snd_pcm_stream_unlock_irq(substream);
1574
1575 return result;
1576 }
1577
1578
1579 /* WARNING: Don't forget to fput back the file */
1580 static struct file *snd_pcm_file_fd(int fd, int *fput_needed)
1581 {
1582 struct file *file;
1583 struct inode *inode;
1584 unsigned int minor;
1585
1586 file = fget_light(fd, fput_needed);
1587 if (!file)
1588 return NULL;
1589 inode = file_inode(file);
1590 if (!S_ISCHR(inode->i_mode) ||
1591 imajor(inode) != snd_major) {
1592 fput_light(file, *fput_needed);
1593 return NULL;
1594 }
1595 minor = iminor(inode);
1596 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1597 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1598 fput_light(file, *fput_needed);
1599 return NULL;
1600 }
1601 return file;
1602 }
1603
1604 /*
1605 * PCM link handling
1606 */
1607 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1608 {
1609 int res = 0;
1610 struct file *file;
1611 struct snd_pcm_file *pcm_file;
1612 struct snd_pcm_substream *substream1;
1613 struct snd_pcm_group *group;
1614 int fput_needed;
1615
1616 file = snd_pcm_file_fd(fd, &fput_needed);
1617 if (!file)
1618 return -EBADFD;
1619 pcm_file = file->private_data;
1620 substream1 = pcm_file->substream;
1621 group = kmalloc(sizeof(*group), GFP_KERNEL);
1622 if (!group) {
1623 res = -ENOMEM;
1624 goto _nolock;
1625 }
1626 down_write(&snd_pcm_link_rwsem);
1627 write_lock_irq(&snd_pcm_link_rwlock);
1628 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1629 substream->runtime->status->state != substream1->runtime->status->state) {
1630 res = -EBADFD;
1631 goto _end;
1632 }
1633 if (snd_pcm_stream_linked(substream1)) {
1634 res = -EALREADY;
1635 goto _end;
1636 }
1637 if (!snd_pcm_stream_linked(substream)) {
1638 substream->group = group;
1639 spin_lock_init(&substream->group->lock);
1640 INIT_LIST_HEAD(&substream->group->substreams);
1641 list_add_tail(&substream->link_list, &substream->group->substreams);
1642 substream->group->count = 1;
1643 }
1644 list_add_tail(&substream1->link_list, &substream->group->substreams);
1645 substream->group->count++;
1646 substream1->group = substream->group;
1647 _end:
1648 write_unlock_irq(&snd_pcm_link_rwlock);
1649 up_write(&snd_pcm_link_rwsem);
1650 _nolock:
1651 snd_card_unref(substream1->pcm->card);
1652 fput_light(file, fput_needed);
1653 if (res < 0)
1654 kfree(group);
1655 return res;
1656 }
1657
1658 static void relink_to_local(struct snd_pcm_substream *substream)
1659 {
1660 substream->group = &substream->self_group;
1661 INIT_LIST_HEAD(&substream->self_group.substreams);
1662 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1663 }
1664
1665 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1666 {
1667 struct snd_pcm_substream *s;
1668 int res = 0;
1669
1670 down_write(&snd_pcm_link_rwsem);
1671 write_lock_irq(&snd_pcm_link_rwlock);
1672 if (!snd_pcm_stream_linked(substream)) {
1673 res = -EALREADY;
1674 goto _end;
1675 }
1676 list_del(&substream->link_list);
1677 substream->group->count--;
1678 if (substream->group->count == 1) { /* detach the last stream, too */
1679 snd_pcm_group_for_each_entry(s, substream) {
1680 relink_to_local(s);
1681 break;
1682 }
1683 kfree(substream->group);
1684 }
1685 relink_to_local(substream);
1686 _end:
1687 write_unlock_irq(&snd_pcm_link_rwlock);
1688 up_write(&snd_pcm_link_rwsem);
1689 return res;
1690 }
1691
1692 /*
1693 * hw configurator
1694 */
1695 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1696 struct snd_pcm_hw_rule *rule)
1697 {
1698 struct snd_interval t;
1699 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1700 hw_param_interval_c(params, rule->deps[1]), &t);
1701 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1702 }
1703
1704 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1705 struct snd_pcm_hw_rule *rule)
1706 {
1707 struct snd_interval t;
1708 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1709 hw_param_interval_c(params, rule->deps[1]), &t);
1710 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1711 }
1712
1713 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1714 struct snd_pcm_hw_rule *rule)
1715 {
1716 struct snd_interval t;
1717 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1718 hw_param_interval_c(params, rule->deps[1]),
1719 (unsigned long) rule->private, &t);
1720 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1721 }
1722
1723 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1724 struct snd_pcm_hw_rule *rule)
1725 {
1726 struct snd_interval t;
1727 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1728 (unsigned long) rule->private,
1729 hw_param_interval_c(params, rule->deps[1]), &t);
1730 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1731 }
1732
1733 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1734 struct snd_pcm_hw_rule *rule)
1735 {
1736 unsigned int k;
1737 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1738 struct snd_mask m;
1739 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1740 snd_mask_any(&m);
1741 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1742 int bits;
1743 if (! snd_mask_test(mask, k))
1744 continue;
1745 bits = snd_pcm_format_physical_width(k);
1746 if (bits <= 0)
1747 continue; /* ignore invalid formats */
1748 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1749 snd_mask_reset(&m, k);
1750 }
1751 return snd_mask_refine(mask, &m);
1752 }
1753
1754 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1755 struct snd_pcm_hw_rule *rule)
1756 {
1757 struct snd_interval t;
1758 unsigned int k;
1759 t.min = UINT_MAX;
1760 t.max = 0;
1761 t.openmin = 0;
1762 t.openmax = 0;
1763 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1764 int bits;
1765 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1766 continue;
1767 bits = snd_pcm_format_physical_width(k);
1768 if (bits <= 0)
1769 continue; /* ignore invalid formats */
1770 if (t.min > (unsigned)bits)
1771 t.min = bits;
1772 if (t.max < (unsigned)bits)
1773 t.max = bits;
1774 }
1775 t.integer = 1;
1776 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1777 }
1778
1779 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1780 #error "Change this table"
1781 #endif
1782
1783 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1784 48000, 64000, 88200, 96000, 176400, 192000 };
1785
1786 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1787 .count = ARRAY_SIZE(rates),
1788 .list = rates,
1789 };
1790
1791 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1792 struct snd_pcm_hw_rule *rule)
1793 {
1794 struct snd_pcm_hardware *hw = rule->private;
1795 return snd_interval_list(hw_param_interval(params, rule->var),
1796 snd_pcm_known_rates.count,
1797 snd_pcm_known_rates.list, hw->rates);
1798 }
1799
1800 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1801 struct snd_pcm_hw_rule *rule)
1802 {
1803 struct snd_interval t;
1804 struct snd_pcm_substream *substream = rule->private;
1805 t.min = 0;
1806 t.max = substream->buffer_bytes_max;
1807 t.openmin = 0;
1808 t.openmax = 0;
1809 t.integer = 1;
1810 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1811 }
1812
1813 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1814 {
1815 struct snd_pcm_runtime *runtime = substream->runtime;
1816 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1817 int k, err;
1818
1819 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1820 snd_mask_any(constrs_mask(constrs, k));
1821 }
1822
1823 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1824 snd_interval_any(constrs_interval(constrs, k));
1825 }
1826
1827 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1828 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1829 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1830 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1831 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1832
1833 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1834 snd_pcm_hw_rule_format, NULL,
1835 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1836 if (err < 0)
1837 return err;
1838 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1839 snd_pcm_hw_rule_sample_bits, NULL,
1840 SNDRV_PCM_HW_PARAM_FORMAT,
1841 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1842 if (err < 0)
1843 return err;
1844 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1845 snd_pcm_hw_rule_div, NULL,
1846 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1847 if (err < 0)
1848 return err;
1849 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1850 snd_pcm_hw_rule_mul, NULL,
1851 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1852 if (err < 0)
1853 return err;
1854 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1855 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1856 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1857 if (err < 0)
1858 return err;
1859 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1860 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1861 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1862 if (err < 0)
1863 return err;
1864 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1865 snd_pcm_hw_rule_div, NULL,
1866 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1867 if (err < 0)
1868 return err;
1869 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1870 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1871 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1872 if (err < 0)
1873 return err;
1874 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1875 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1876 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1877 if (err < 0)
1878 return err;
1879 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1880 snd_pcm_hw_rule_div, NULL,
1881 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1882 if (err < 0)
1883 return err;
1884 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1885 snd_pcm_hw_rule_div, NULL,
1886 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1887 if (err < 0)
1888 return err;
1889 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1890 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1891 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1892 if (err < 0)
1893 return err;
1894 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1895 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1896 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1897 if (err < 0)
1898 return err;
1899 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1900 snd_pcm_hw_rule_mul, NULL,
1901 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1902 if (err < 0)
1903 return err;
1904 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1905 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1906 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1907 if (err < 0)
1908 return err;
1909 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1910 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1911 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1912 if (err < 0)
1913 return err;
1914 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1915 snd_pcm_hw_rule_muldivk, (void*) 8,
1916 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1917 if (err < 0)
1918 return err;
1919 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1920 snd_pcm_hw_rule_muldivk, (void*) 8,
1921 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1922 if (err < 0)
1923 return err;
1924 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1925 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1926 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1927 if (err < 0)
1928 return err;
1929 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1930 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1931 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1932 if (err < 0)
1933 return err;
1934 return 0;
1935 }
1936
1937 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1938 {
1939 struct snd_pcm_runtime *runtime = substream->runtime;
1940 struct snd_pcm_hardware *hw = &runtime->hw;
1941 int err;
1942 unsigned int mask = 0;
1943
1944 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1945 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1946 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1947 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1948 if (hw->info & SNDRV_PCM_INFO_MMAP) {
1949 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1950 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1951 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1952 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1953 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1954 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1955 }
1956 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1957 if (err < 0)
1958 return err;
1959
1960 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1961 if (err < 0)
1962 return err;
1963
1964 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1965 if (err < 0)
1966 return err;
1967
1968 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1969 hw->channels_min, hw->channels_max);
1970 if (err < 0)
1971 return err;
1972
1973 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1974 hw->rate_min, hw->rate_max);
1975 if (err < 0)
1976 return err;
1977
1978 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1979 hw->period_bytes_min, hw->period_bytes_max);
1980 if (err < 0)
1981 return err;
1982
1983 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1984 hw->periods_min, hw->periods_max);
1985 if (err < 0)
1986 return err;
1987
1988 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1989 hw->period_bytes_min, hw->buffer_bytes_max);
1990 if (err < 0)
1991 return err;
1992
1993 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1994 snd_pcm_hw_rule_buffer_bytes_max, substream,
1995 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1996 if (err < 0)
1997 return err;
1998
1999 /* FIXME: remove */
2000 if (runtime->dma_bytes) {
2001 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2002 if (err < 0)
2003 return err;
2004 }
2005
2006 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2007 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2008 snd_pcm_hw_rule_rate, hw,
2009 SNDRV_PCM_HW_PARAM_RATE, -1);
2010 if (err < 0)
2011 return err;
2012 }
2013
2014 /* FIXME: this belong to lowlevel */
2015 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2016
2017 return 0;
2018 }
2019
2020 static void pcm_release_private(struct snd_pcm_substream *substream)
2021 {
2022 snd_pcm_unlink(substream);
2023 }
2024
2025 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2026 {
2027 substream->ref_count--;
2028 if (substream->ref_count > 0)
2029 return;
2030
2031 snd_pcm_drop(substream);
2032 if (substream->hw_opened) {
2033 if (substream->ops->hw_free != NULL)
2034 substream->ops->hw_free(substream);
2035 substream->ops->close(substream);
2036 substream->hw_opened = 0;
2037 }
2038 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2039 pm_qos_remove_request(&substream->latency_pm_qos_req);
2040 if (substream->pcm_release) {
2041 substream->pcm_release(substream);
2042 substream->pcm_release = NULL;
2043 }
2044 snd_pcm_detach_substream(substream);
2045 }
2046
2047 EXPORT_SYMBOL(snd_pcm_release_substream);
2048
2049 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2050 struct file *file,
2051 struct snd_pcm_substream **rsubstream)
2052 {
2053 struct snd_pcm_substream *substream;
2054 int err;
2055
2056 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2057 if (err < 0)
2058 return err;
2059 if (substream->ref_count > 1) {
2060 *rsubstream = substream;
2061 return 0;
2062 }
2063
2064 err = snd_pcm_hw_constraints_init(substream);
2065 if (err < 0) {
2066 snd_printd("snd_pcm_hw_constraints_init failed\n");
2067 goto error;
2068 }
2069
2070 if ((err = substream->ops->open(substream)) < 0)
2071 goto error;
2072
2073 substream->hw_opened = 1;
2074
2075 err = snd_pcm_hw_constraints_complete(substream);
2076 if (err < 0) {
2077 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2078 goto error;
2079 }
2080
2081 *rsubstream = substream;
2082 return 0;
2083
2084 error:
2085 snd_pcm_release_substream(substream);
2086 return err;
2087 }
2088
2089 EXPORT_SYMBOL(snd_pcm_open_substream);
2090
2091 static int snd_pcm_open_file(struct file *file,
2092 struct snd_pcm *pcm,
2093 int stream)
2094 {
2095 struct snd_pcm_file *pcm_file;
2096 struct snd_pcm_substream *substream;
2097 int err;
2098
2099 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2100 if (err < 0)
2101 return err;
2102
2103 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2104 if (pcm_file == NULL) {
2105 snd_pcm_release_substream(substream);
2106 return -ENOMEM;
2107 }
2108 pcm_file->substream = substream;
2109 if (substream->ref_count == 1) {
2110 substream->file = pcm_file;
2111 substream->pcm_release = pcm_release_private;
2112 }
2113 file->private_data = pcm_file;
2114
2115 return 0;
2116 }
2117
2118 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2119 {
2120 struct snd_pcm *pcm;
2121 int err = nonseekable_open(inode, file);
2122 if (err < 0)
2123 return err;
2124 pcm = snd_lookup_minor_data(iminor(inode),
2125 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2126 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2127 if (pcm)
2128 snd_card_unref(pcm->card);
2129 return err;
2130 }
2131
2132 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2133 {
2134 struct snd_pcm *pcm;
2135 int err = nonseekable_open(inode, file);
2136 if (err < 0)
2137 return err;
2138 pcm = snd_lookup_minor_data(iminor(inode),
2139 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2140 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2141 if (pcm)
2142 snd_card_unref(pcm->card);
2143 return err;
2144 }
2145
2146 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2147 {
2148 int err;
2149 wait_queue_t wait;
2150
2151 if (pcm == NULL) {
2152 err = -ENODEV;
2153 goto __error1;
2154 }
2155 err = snd_card_file_add(pcm->card, file);
2156 if (err < 0)
2157 goto __error1;
2158 if (!try_module_get(pcm->card->module)) {
2159 err = -EFAULT;
2160 goto __error2;
2161 }
2162 init_waitqueue_entry(&wait, current);
2163 add_wait_queue(&pcm->open_wait, &wait);
2164 mutex_lock(&pcm->open_mutex);
2165 while (1) {
2166 err = snd_pcm_open_file(file, pcm, stream);
2167 if (err >= 0)
2168 break;
2169 if (err == -EAGAIN) {
2170 if (file->f_flags & O_NONBLOCK) {
2171 err = -EBUSY;
2172 break;
2173 }
2174 } else
2175 break;
2176 set_current_state(TASK_INTERRUPTIBLE);
2177 mutex_unlock(&pcm->open_mutex);
2178 schedule();
2179 mutex_lock(&pcm->open_mutex);
2180 if (pcm->card->shutdown) {
2181 err = -ENODEV;
2182 break;
2183 }
2184 if (signal_pending(current)) {
2185 err = -ERESTARTSYS;
2186 break;
2187 }
2188 }
2189 remove_wait_queue(&pcm->open_wait, &wait);
2190 mutex_unlock(&pcm->open_mutex);
2191 if (err < 0)
2192 goto __error;
2193 return err;
2194
2195 __error:
2196 module_put(pcm->card->module);
2197 __error2:
2198 snd_card_file_remove(pcm->card, file);
2199 __error1:
2200 return err;
2201 }
2202
2203 static int snd_pcm_release(struct inode *inode, struct file *file)
2204 {
2205 struct snd_pcm *pcm;
2206 struct snd_pcm_substream *substream;
2207 struct snd_pcm_file *pcm_file;
2208
2209 pcm_file = file->private_data;
2210 substream = pcm_file->substream;
2211 if (snd_BUG_ON(!substream))
2212 return -ENXIO;
2213 pcm = substream->pcm;
2214 mutex_lock(&pcm->open_mutex);
2215 snd_pcm_release_substream(substream);
2216 kfree(pcm_file);
2217 mutex_unlock(&pcm->open_mutex);
2218 wake_up(&pcm->open_wait);
2219 module_put(pcm->card->module);
2220 snd_card_file_remove(pcm->card, file);
2221 return 0;
2222 }
2223
2224 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2225 snd_pcm_uframes_t frames)
2226 {
2227 struct snd_pcm_runtime *runtime = substream->runtime;
2228 snd_pcm_sframes_t appl_ptr;
2229 snd_pcm_sframes_t ret;
2230 snd_pcm_sframes_t hw_avail;
2231
2232 if (frames == 0)
2233 return 0;
2234
2235 snd_pcm_stream_lock_irq(substream);
2236 switch (runtime->status->state) {
2237 case SNDRV_PCM_STATE_PREPARED:
2238 break;
2239 case SNDRV_PCM_STATE_DRAINING:
2240 case SNDRV_PCM_STATE_RUNNING:
2241 if (snd_pcm_update_hw_ptr(substream) >= 0)
2242 break;
2243 /* Fall through */
2244 case SNDRV_PCM_STATE_XRUN:
2245 ret = -EPIPE;
2246 goto __end;
2247 case SNDRV_PCM_STATE_SUSPENDED:
2248 ret = -ESTRPIPE;
2249 goto __end;
2250 default:
2251 ret = -EBADFD;
2252 goto __end;
2253 }
2254
2255 hw_avail = snd_pcm_playback_hw_avail(runtime);
2256 if (hw_avail <= 0) {
2257 ret = 0;
2258 goto __end;
2259 }
2260 if (frames > (snd_pcm_uframes_t)hw_avail)
2261 frames = hw_avail;
2262 appl_ptr = runtime->control->appl_ptr - frames;
2263 if (appl_ptr < 0)
2264 appl_ptr += runtime->boundary;
2265 runtime->control->appl_ptr = appl_ptr;
2266 ret = frames;
2267 __end:
2268 snd_pcm_stream_unlock_irq(substream);
2269 return ret;
2270 }
2271
2272 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2273 snd_pcm_uframes_t frames)
2274 {
2275 struct snd_pcm_runtime *runtime = substream->runtime;
2276 snd_pcm_sframes_t appl_ptr;
2277 snd_pcm_sframes_t ret;
2278 snd_pcm_sframes_t hw_avail;
2279
2280 if (frames == 0)
2281 return 0;
2282
2283 snd_pcm_stream_lock_irq(substream);
2284 switch (runtime->status->state) {
2285 case SNDRV_PCM_STATE_PREPARED:
2286 case SNDRV_PCM_STATE_DRAINING:
2287 break;
2288 case SNDRV_PCM_STATE_RUNNING:
2289 if (snd_pcm_update_hw_ptr(substream) >= 0)
2290 break;
2291 /* Fall through */
2292 case SNDRV_PCM_STATE_XRUN:
2293 ret = -EPIPE;
2294 goto __end;
2295 case SNDRV_PCM_STATE_SUSPENDED:
2296 ret = -ESTRPIPE;
2297 goto __end;
2298 default:
2299 ret = -EBADFD;
2300 goto __end;
2301 }
2302
2303 hw_avail = snd_pcm_capture_hw_avail(runtime);
2304 if (hw_avail <= 0) {
2305 ret = 0;
2306 goto __end;
2307 }
2308 if (frames > (snd_pcm_uframes_t)hw_avail)
2309 frames = hw_avail;
2310 appl_ptr = runtime->control->appl_ptr - frames;
2311 if (appl_ptr < 0)
2312 appl_ptr += runtime->boundary;
2313 runtime->control->appl_ptr = appl_ptr;
2314 ret = frames;
2315 __end:
2316 snd_pcm_stream_unlock_irq(substream);
2317 return ret;
2318 }
2319
2320 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2321 snd_pcm_uframes_t frames)
2322 {
2323 struct snd_pcm_runtime *runtime = substream->runtime;
2324 snd_pcm_sframes_t appl_ptr;
2325 snd_pcm_sframes_t ret;
2326 snd_pcm_sframes_t avail;
2327
2328 if (frames == 0)
2329 return 0;
2330
2331 snd_pcm_stream_lock_irq(substream);
2332 switch (runtime->status->state) {
2333 case SNDRV_PCM_STATE_PREPARED:
2334 case SNDRV_PCM_STATE_PAUSED:
2335 break;
2336 case SNDRV_PCM_STATE_DRAINING:
2337 case SNDRV_PCM_STATE_RUNNING:
2338 if (snd_pcm_update_hw_ptr(substream) >= 0)
2339 break;
2340 /* Fall through */
2341 case SNDRV_PCM_STATE_XRUN:
2342 ret = -EPIPE;
2343 goto __end;
2344 case SNDRV_PCM_STATE_SUSPENDED:
2345 ret = -ESTRPIPE;
2346 goto __end;
2347 default:
2348 ret = -EBADFD;
2349 goto __end;
2350 }
2351
2352 avail = snd_pcm_playback_avail(runtime);
2353 if (avail <= 0) {
2354 ret = 0;
2355 goto __end;
2356 }
2357 if (frames > (snd_pcm_uframes_t)avail)
2358 frames = avail;
2359 appl_ptr = runtime->control->appl_ptr + frames;
2360 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2361 appl_ptr -= runtime->boundary;
2362 runtime->control->appl_ptr = appl_ptr;
2363 ret = frames;
2364 __end:
2365 snd_pcm_stream_unlock_irq(substream);
2366 return ret;
2367 }
2368
2369 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2370 snd_pcm_uframes_t frames)
2371 {
2372 struct snd_pcm_runtime *runtime = substream->runtime;
2373 snd_pcm_sframes_t appl_ptr;
2374 snd_pcm_sframes_t ret;
2375 snd_pcm_sframes_t avail;
2376
2377 if (frames == 0)
2378 return 0;
2379
2380 snd_pcm_stream_lock_irq(substream);
2381 switch (runtime->status->state) {
2382 case SNDRV_PCM_STATE_PREPARED:
2383 case SNDRV_PCM_STATE_DRAINING:
2384 case SNDRV_PCM_STATE_PAUSED:
2385 break;
2386 case SNDRV_PCM_STATE_RUNNING:
2387 if (snd_pcm_update_hw_ptr(substream) >= 0)
2388 break;
2389 /* Fall through */
2390 case SNDRV_PCM_STATE_XRUN:
2391 ret = -EPIPE;
2392 goto __end;
2393 case SNDRV_PCM_STATE_SUSPENDED:
2394 ret = -ESTRPIPE;
2395 goto __end;
2396 default:
2397 ret = -EBADFD;
2398 goto __end;
2399 }
2400
2401 avail = snd_pcm_capture_avail(runtime);
2402 if (avail <= 0) {
2403 ret = 0;
2404 goto __end;
2405 }
2406 if (frames > (snd_pcm_uframes_t)avail)
2407 frames = avail;
2408 appl_ptr = runtime->control->appl_ptr + frames;
2409 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2410 appl_ptr -= runtime->boundary;
2411 runtime->control->appl_ptr = appl_ptr;
2412 ret = frames;
2413 __end:
2414 snd_pcm_stream_unlock_irq(substream);
2415 return ret;
2416 }
2417
2418 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2419 {
2420 struct snd_pcm_runtime *runtime = substream->runtime;
2421 int err;
2422
2423 snd_pcm_stream_lock_irq(substream);
2424 switch (runtime->status->state) {
2425 case SNDRV_PCM_STATE_DRAINING:
2426 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2427 goto __badfd;
2428 case SNDRV_PCM_STATE_RUNNING:
2429 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2430 break;
2431 /* Fall through */
2432 case SNDRV_PCM_STATE_PREPARED:
2433 case SNDRV_PCM_STATE_SUSPENDED:
2434 err = 0;
2435 break;
2436 case SNDRV_PCM_STATE_XRUN:
2437 err = -EPIPE;
2438 break;
2439 default:
2440 __badfd:
2441 err = -EBADFD;
2442 break;
2443 }
2444 snd_pcm_stream_unlock_irq(substream);
2445 return err;
2446 }
2447
2448 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2449 snd_pcm_sframes_t __user *res)
2450 {
2451 struct snd_pcm_runtime *runtime = substream->runtime;
2452 int err;
2453 snd_pcm_sframes_t n = 0;
2454
2455 snd_pcm_stream_lock_irq(substream);
2456 switch (runtime->status->state) {
2457 case SNDRV_PCM_STATE_DRAINING:
2458 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2459 goto __badfd;
2460 case SNDRV_PCM_STATE_RUNNING:
2461 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2462 break;
2463 /* Fall through */
2464 case SNDRV_PCM_STATE_PREPARED:
2465 case SNDRV_PCM_STATE_SUSPENDED:
2466 err = 0;
2467 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2468 n = snd_pcm_playback_hw_avail(runtime);
2469 else
2470 n = snd_pcm_capture_avail(runtime);
2471 n += runtime->delay;
2472 break;
2473 case SNDRV_PCM_STATE_XRUN:
2474 err = -EPIPE;
2475 break;
2476 default:
2477 __badfd:
2478 err = -EBADFD;
2479 break;
2480 }
2481 snd_pcm_stream_unlock_irq(substream);
2482 if (!err)
2483 if (put_user(n, res))
2484 err = -EFAULT;
2485 return err;
2486 }
2487
2488 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2489 struct snd_pcm_sync_ptr __user *_sync_ptr)
2490 {
2491 struct snd_pcm_runtime *runtime = substream->runtime;
2492 struct snd_pcm_sync_ptr sync_ptr;
2493 volatile struct snd_pcm_mmap_status *status;
2494 volatile struct snd_pcm_mmap_control *control;
2495 int err;
2496
2497 memset(&sync_ptr, 0, sizeof(sync_ptr));
2498 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2499 return -EFAULT;
2500 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2501 return -EFAULT;
2502 status = runtime->status;
2503 control = runtime->control;
2504 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2505 err = snd_pcm_hwsync(substream);
2506 if (err < 0)
2507 return err;
2508 }
2509 snd_pcm_stream_lock_irq(substream);
2510 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2511 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2512 else
2513 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2514 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2515 control->avail_min = sync_ptr.c.control.avail_min;
2516 else
2517 sync_ptr.c.control.avail_min = control->avail_min;
2518 sync_ptr.s.status.state = status->state;
2519 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2520 sync_ptr.s.status.tstamp = status->tstamp;
2521 sync_ptr.s.status.suspended_state = status->suspended_state;
2522 snd_pcm_stream_unlock_irq(substream);
2523 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2524 return -EFAULT;
2525 return 0;
2526 }
2527
2528 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2529 {
2530 struct snd_pcm_runtime *runtime = substream->runtime;
2531 int arg;
2532
2533 if (get_user(arg, _arg))
2534 return -EFAULT;
2535 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2536 return -EINVAL;
2537 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2538 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2539 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2540 return 0;
2541 }
2542
2543 static int snd_pcm_common_ioctl1(struct file *file,
2544 struct snd_pcm_substream *substream,
2545 unsigned int cmd, void __user *arg)
2546 {
2547 switch (cmd) {
2548 case SNDRV_PCM_IOCTL_PVERSION:
2549 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2550 case SNDRV_PCM_IOCTL_INFO:
2551 return snd_pcm_info_user(substream, arg);
2552 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2553 return 0;
2554 case SNDRV_PCM_IOCTL_TTSTAMP:
2555 return snd_pcm_tstamp(substream, arg);
2556 case SNDRV_PCM_IOCTL_HW_REFINE:
2557 return snd_pcm_hw_refine_user(substream, arg);
2558 case SNDRV_PCM_IOCTL_HW_PARAMS:
2559 return snd_pcm_hw_params_user(substream, arg);
2560 case SNDRV_PCM_IOCTL_HW_FREE:
2561 return snd_pcm_hw_free(substream);
2562 case SNDRV_PCM_IOCTL_SW_PARAMS:
2563 return snd_pcm_sw_params_user(substream, arg);
2564 case SNDRV_PCM_IOCTL_STATUS:
2565 return snd_pcm_status_user(substream, arg);
2566 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2567 return snd_pcm_channel_info_user(substream, arg);
2568 case SNDRV_PCM_IOCTL_PREPARE:
2569 return snd_pcm_prepare(substream, file);
2570 case SNDRV_PCM_IOCTL_RESET:
2571 return snd_pcm_reset(substream);
2572 case SNDRV_PCM_IOCTL_START:
2573 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2574 case SNDRV_PCM_IOCTL_LINK:
2575 return snd_pcm_link(substream, (int)(unsigned long) arg);
2576 case SNDRV_PCM_IOCTL_UNLINK:
2577 return snd_pcm_unlink(substream);
2578 case SNDRV_PCM_IOCTL_RESUME:
2579 return snd_pcm_resume(substream);
2580 case SNDRV_PCM_IOCTL_XRUN:
2581 return snd_pcm_xrun(substream);
2582 case SNDRV_PCM_IOCTL_HWSYNC:
2583 return snd_pcm_hwsync(substream);
2584 case SNDRV_PCM_IOCTL_DELAY:
2585 return snd_pcm_delay(substream, arg);
2586 case SNDRV_PCM_IOCTL_SYNC_PTR:
2587 return snd_pcm_sync_ptr(substream, arg);
2588 #ifdef CONFIG_SND_SUPPORT_OLD_API
2589 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2590 return snd_pcm_hw_refine_old_user(substream, arg);
2591 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2592 return snd_pcm_hw_params_old_user(substream, arg);
2593 #endif
2594 case SNDRV_PCM_IOCTL_DRAIN:
2595 return snd_pcm_drain(substream, file);
2596 case SNDRV_PCM_IOCTL_DROP:
2597 return snd_pcm_drop(substream);
2598 case SNDRV_PCM_IOCTL_PAUSE:
2599 {
2600 int res;
2601 snd_pcm_stream_lock_irq(substream);
2602 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2603 snd_pcm_stream_unlock_irq(substream);
2604 return res;
2605 }
2606 }
2607 snd_printd("unknown ioctl = 0x%x\n", cmd);
2608 return -ENOTTY;
2609 }
2610
2611 static int snd_pcm_playback_ioctl1(struct file *file,
2612 struct snd_pcm_substream *substream,
2613 unsigned int cmd, void __user *arg)
2614 {
2615 if (snd_BUG_ON(!substream))
2616 return -ENXIO;
2617 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2618 return -EINVAL;
2619 switch (cmd) {
2620 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2621 {
2622 struct snd_xferi xferi;
2623 struct snd_xferi __user *_xferi = arg;
2624 struct snd_pcm_runtime *runtime = substream->runtime;
2625 snd_pcm_sframes_t result;
2626 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2627 return -EBADFD;
2628 if (put_user(0, &_xferi->result))
2629 return -EFAULT;
2630 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2631 return -EFAULT;
2632 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2633 __put_user(result, &_xferi->result);
2634 return result < 0 ? result : 0;
2635 }
2636 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2637 {
2638 struct snd_xfern xfern;
2639 struct snd_xfern __user *_xfern = arg;
2640 struct snd_pcm_runtime *runtime = substream->runtime;
2641 void __user **bufs;
2642 snd_pcm_sframes_t result;
2643 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2644 return -EBADFD;
2645 if (runtime->channels > 128)
2646 return -EINVAL;
2647 if (put_user(0, &_xfern->result))
2648 return -EFAULT;
2649 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2650 return -EFAULT;
2651
2652 bufs = memdup_user(xfern.bufs,
2653 sizeof(void *) * runtime->channels);
2654 if (IS_ERR(bufs))
2655 return PTR_ERR(bufs);
2656 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2657 kfree(bufs);
2658 __put_user(result, &_xfern->result);
2659 return result < 0 ? result : 0;
2660 }
2661 case SNDRV_PCM_IOCTL_REWIND:
2662 {
2663 snd_pcm_uframes_t frames;
2664 snd_pcm_uframes_t __user *_frames = arg;
2665 snd_pcm_sframes_t result;
2666 if (get_user(frames, _frames))
2667 return -EFAULT;
2668 if (put_user(0, _frames))
2669 return -EFAULT;
2670 result = snd_pcm_playback_rewind(substream, frames);
2671 __put_user(result, _frames);
2672 return result < 0 ? result : 0;
2673 }
2674 case SNDRV_PCM_IOCTL_FORWARD:
2675 {
2676 snd_pcm_uframes_t frames;
2677 snd_pcm_uframes_t __user *_frames = arg;
2678 snd_pcm_sframes_t result;
2679 if (get_user(frames, _frames))
2680 return -EFAULT;
2681 if (put_user(0, _frames))
2682 return -EFAULT;
2683 result = snd_pcm_playback_forward(substream, frames);
2684 __put_user(result, _frames);
2685 return result < 0 ? result : 0;
2686 }
2687 }
2688 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2689 }
2690
2691 static int snd_pcm_capture_ioctl1(struct file *file,
2692 struct snd_pcm_substream *substream,
2693 unsigned int cmd, void __user *arg)
2694 {
2695 if (snd_BUG_ON(!substream))
2696 return -ENXIO;
2697 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2698 return -EINVAL;
2699 switch (cmd) {
2700 case SNDRV_PCM_IOCTL_READI_FRAMES:
2701 {
2702 struct snd_xferi xferi;
2703 struct snd_xferi __user *_xferi = arg;
2704 struct snd_pcm_runtime *runtime = substream->runtime;
2705 snd_pcm_sframes_t result;
2706 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2707 return -EBADFD;
2708 if (put_user(0, &_xferi->result))
2709 return -EFAULT;
2710 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2711 return -EFAULT;
2712 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2713 __put_user(result, &_xferi->result);
2714 return result < 0 ? result : 0;
2715 }
2716 case SNDRV_PCM_IOCTL_READN_FRAMES:
2717 {
2718 struct snd_xfern xfern;
2719 struct snd_xfern __user *_xfern = arg;
2720 struct snd_pcm_runtime *runtime = substream->runtime;
2721 void *bufs;
2722 snd_pcm_sframes_t result;
2723 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2724 return -EBADFD;
2725 if (runtime->channels > 128)
2726 return -EINVAL;
2727 if (put_user(0, &_xfern->result))
2728 return -EFAULT;
2729 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2730 return -EFAULT;
2731
2732 bufs = memdup_user(xfern.bufs,
2733 sizeof(void *) * runtime->channels);
2734 if (IS_ERR(bufs))
2735 return PTR_ERR(bufs);
2736 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2737 kfree(bufs);
2738 __put_user(result, &_xfern->result);
2739 return result < 0 ? result : 0;
2740 }
2741 case SNDRV_PCM_IOCTL_REWIND:
2742 {
2743 snd_pcm_uframes_t frames;
2744 snd_pcm_uframes_t __user *_frames = arg;
2745 snd_pcm_sframes_t result;
2746 if (get_user(frames, _frames))
2747 return -EFAULT;
2748 if (put_user(0, _frames))
2749 return -EFAULT;
2750 result = snd_pcm_capture_rewind(substream, frames);
2751 __put_user(result, _frames);
2752 return result < 0 ? result : 0;
2753 }
2754 case SNDRV_PCM_IOCTL_FORWARD:
2755 {
2756 snd_pcm_uframes_t frames;
2757 snd_pcm_uframes_t __user *_frames = arg;
2758 snd_pcm_sframes_t result;
2759 if (get_user(frames, _frames))
2760 return -EFAULT;
2761 if (put_user(0, _frames))
2762 return -EFAULT;
2763 result = snd_pcm_capture_forward(substream, frames);
2764 __put_user(result, _frames);
2765 return result < 0 ? result : 0;
2766 }
2767 }
2768 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2769 }
2770
2771 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2772 unsigned long arg)
2773 {
2774 struct snd_pcm_file *pcm_file;
2775
2776 pcm_file = file->private_data;
2777
2778 if (((cmd >> 8) & 0xff) != 'A')
2779 return -ENOTTY;
2780
2781 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2782 (void __user *)arg);
2783 }
2784
2785 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2786 unsigned long arg)
2787 {
2788 struct snd_pcm_file *pcm_file;
2789
2790 pcm_file = file->private_data;
2791
2792 if (((cmd >> 8) & 0xff) != 'A')
2793 return -ENOTTY;
2794
2795 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2796 (void __user *)arg);
2797 }
2798
2799 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2800 unsigned int cmd, void *arg)
2801 {
2802 mm_segment_t fs;
2803 int result;
2804
2805 fs = snd_enter_user();
2806 switch (substream->stream) {
2807 case SNDRV_PCM_STREAM_PLAYBACK:
2808 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2809 (void __user *)arg);
2810 break;
2811 case SNDRV_PCM_STREAM_CAPTURE:
2812 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2813 (void __user *)arg);
2814 break;
2815 default:
2816 result = -EINVAL;
2817 break;
2818 }
2819 snd_leave_user(fs);
2820 return result;
2821 }
2822
2823 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2824
2825 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2826 loff_t * offset)
2827 {
2828 struct snd_pcm_file *pcm_file;
2829 struct snd_pcm_substream *substream;
2830 struct snd_pcm_runtime *runtime;
2831 snd_pcm_sframes_t result;
2832
2833 pcm_file = file->private_data;
2834 substream = pcm_file->substream;
2835 if (PCM_RUNTIME_CHECK(substream))
2836 return -ENXIO;
2837 runtime = substream->runtime;
2838 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2839 return -EBADFD;
2840 if (!frame_aligned(runtime, count))
2841 return -EINVAL;
2842 count = bytes_to_frames(runtime, count);
2843 result = snd_pcm_lib_read(substream, buf, count);
2844 if (result > 0)
2845 result = frames_to_bytes(runtime, result);
2846 return result;
2847 }
2848
2849 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2850 size_t count, loff_t * offset)
2851 {
2852 struct snd_pcm_file *pcm_file;
2853 struct snd_pcm_substream *substream;
2854 struct snd_pcm_runtime *runtime;
2855 snd_pcm_sframes_t result;
2856
2857 pcm_file = file->private_data;
2858 substream = pcm_file->substream;
2859 if (PCM_RUNTIME_CHECK(substream))
2860 return -ENXIO;
2861 runtime = substream->runtime;
2862 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2863 return -EBADFD;
2864 if (!frame_aligned(runtime, count))
2865 return -EINVAL;
2866 count = bytes_to_frames(runtime, count);
2867 result = snd_pcm_lib_write(substream, buf, count);
2868 if (result > 0)
2869 result = frames_to_bytes(runtime, result);
2870 return result;
2871 }
2872
2873 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2874 unsigned long nr_segs, loff_t pos)
2875
2876 {
2877 struct snd_pcm_file *pcm_file;
2878 struct snd_pcm_substream *substream;
2879 struct snd_pcm_runtime *runtime;
2880 snd_pcm_sframes_t result;
2881 unsigned long i;
2882 void __user **bufs;
2883 snd_pcm_uframes_t frames;
2884
2885 pcm_file = iocb->ki_filp->private_data;
2886 substream = pcm_file->substream;
2887 if (PCM_RUNTIME_CHECK(substream))
2888 return -ENXIO;
2889 runtime = substream->runtime;
2890 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2891 return -EBADFD;
2892 if (nr_segs > 1024 || nr_segs != runtime->channels)
2893 return -EINVAL;
2894 if (!frame_aligned(runtime, iov->iov_len))
2895 return -EINVAL;
2896 frames = bytes_to_samples(runtime, iov->iov_len);
2897 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2898 if (bufs == NULL)
2899 return -ENOMEM;
2900 for (i = 0; i < nr_segs; ++i)
2901 bufs[i] = iov[i].iov_base;
2902 result = snd_pcm_lib_readv(substream, bufs, frames);
2903 if (result > 0)
2904 result = frames_to_bytes(runtime, result);
2905 kfree(bufs);
2906 return result;
2907 }
2908
2909 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2910 unsigned long nr_segs, loff_t pos)
2911 {
2912 struct snd_pcm_file *pcm_file;
2913 struct snd_pcm_substream *substream;
2914 struct snd_pcm_runtime *runtime;
2915 snd_pcm_sframes_t result;
2916 unsigned long i;
2917 void __user **bufs;
2918 snd_pcm_uframes_t frames;
2919
2920 pcm_file = iocb->ki_filp->private_data;
2921 substream = pcm_file->substream;
2922 if (PCM_RUNTIME_CHECK(substream))
2923 return -ENXIO;
2924 runtime = substream->runtime;
2925 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2926 return -EBADFD;
2927 if (nr_segs > 128 || nr_segs != runtime->channels ||
2928 !frame_aligned(runtime, iov->iov_len))
2929 return -EINVAL;
2930 frames = bytes_to_samples(runtime, iov->iov_len);
2931 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2932 if (bufs == NULL)
2933 return -ENOMEM;
2934 for (i = 0; i < nr_segs; ++i)
2935 bufs[i] = iov[i].iov_base;
2936 result = snd_pcm_lib_writev(substream, bufs, frames);
2937 if (result > 0)
2938 result = frames_to_bytes(runtime, result);
2939 kfree(bufs);
2940 return result;
2941 }
2942
2943 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2944 {
2945 struct snd_pcm_file *pcm_file;
2946 struct snd_pcm_substream *substream;
2947 struct snd_pcm_runtime *runtime;
2948 unsigned int mask;
2949 snd_pcm_uframes_t avail;
2950
2951 pcm_file = file->private_data;
2952
2953 substream = pcm_file->substream;
2954 if (PCM_RUNTIME_CHECK(substream))
2955 return -ENXIO;
2956 runtime = substream->runtime;
2957
2958 poll_wait(file, &runtime->sleep, wait);
2959
2960 snd_pcm_stream_lock_irq(substream);
2961 avail = snd_pcm_playback_avail(runtime);
2962 switch (runtime->status->state) {
2963 case SNDRV_PCM_STATE_RUNNING:
2964 case SNDRV_PCM_STATE_PREPARED:
2965 case SNDRV_PCM_STATE_PAUSED:
2966 if (avail >= runtime->control->avail_min) {
2967 mask = POLLOUT | POLLWRNORM;
2968 break;
2969 }
2970 /* Fall through */
2971 case SNDRV_PCM_STATE_DRAINING:
2972 mask = 0;
2973 break;
2974 default:
2975 mask = POLLOUT | POLLWRNORM | POLLERR;
2976 break;
2977 }
2978 snd_pcm_stream_unlock_irq(substream);
2979 return mask;
2980 }
2981
2982 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2983 {
2984 struct snd_pcm_file *pcm_file;
2985 struct snd_pcm_substream *substream;
2986 struct snd_pcm_runtime *runtime;
2987 unsigned int mask;
2988 snd_pcm_uframes_t avail;
2989
2990 pcm_file = file->private_data;
2991
2992 substream = pcm_file->substream;
2993 if (PCM_RUNTIME_CHECK(substream))
2994 return -ENXIO;
2995 runtime = substream->runtime;
2996
2997 poll_wait(file, &runtime->sleep, wait);
2998
2999 snd_pcm_stream_lock_irq(substream);
3000 avail = snd_pcm_capture_avail(runtime);
3001 switch (runtime->status->state) {
3002 case SNDRV_PCM_STATE_RUNNING:
3003 case SNDRV_PCM_STATE_PREPARED:
3004 case SNDRV_PCM_STATE_PAUSED:
3005 if (avail >= runtime->control->avail_min) {
3006 mask = POLLIN | POLLRDNORM;
3007 break;
3008 }
3009 mask = 0;
3010 break;
3011 case SNDRV_PCM_STATE_DRAINING:
3012 if (avail > 0) {
3013 mask = POLLIN | POLLRDNORM;
3014 break;
3015 }
3016 /* Fall through */
3017 default:
3018 mask = POLLIN | POLLRDNORM | POLLERR;
3019 break;
3020 }
3021 snd_pcm_stream_unlock_irq(substream);
3022 return mask;
3023 }
3024
3025 /*
3026 * mmap support
3027 */
3028
3029 /*
3030 * Only on coherent architectures, we can mmap the status and the control records
3031 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3032 */
3033 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3034 /*
3035 * mmap status record
3036 */
3037 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3038 struct vm_fault *vmf)
3039 {
3040 struct snd_pcm_substream *substream = area->vm_private_data;
3041 struct snd_pcm_runtime *runtime;
3042
3043 if (substream == NULL)
3044 return VM_FAULT_SIGBUS;
3045 runtime = substream->runtime;
3046 vmf->page = virt_to_page(runtime->status);
3047 get_page(vmf->page);
3048 return 0;
3049 }
3050
3051 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3052 {
3053 .fault = snd_pcm_mmap_status_fault,
3054 };
3055
3056 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3057 struct vm_area_struct *area)
3058 {
3059 long size;
3060 if (!(area->vm_flags & VM_READ))
3061 return -EINVAL;
3062 size = area->vm_end - area->vm_start;
3063 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3064 return -EINVAL;
3065 area->vm_ops = &snd_pcm_vm_ops_status;
3066 area->vm_private_data = substream;
3067 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3068 return 0;
3069 }
3070
3071 /*
3072 * mmap control record
3073 */
3074 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3075 struct vm_fault *vmf)
3076 {
3077 struct snd_pcm_substream *substream = area->vm_private_data;
3078 struct snd_pcm_runtime *runtime;
3079
3080 if (substream == NULL)
3081 return VM_FAULT_SIGBUS;
3082 runtime = substream->runtime;
3083 vmf->page = virt_to_page(runtime->control);
3084 get_page(vmf->page);
3085 return 0;
3086 }
3087
3088 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3089 {
3090 .fault = snd_pcm_mmap_control_fault,
3091 };
3092
3093 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3094 struct vm_area_struct *area)
3095 {
3096 long size;
3097 if (!(area->vm_flags & VM_READ))
3098 return -EINVAL;
3099 size = area->vm_end - area->vm_start;
3100 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3101 return -EINVAL;
3102 area->vm_ops = &snd_pcm_vm_ops_control;
3103 area->vm_private_data = substream;
3104 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3105 return 0;
3106 }
3107 #else /* ! coherent mmap */
3108 /*
3109 * don't support mmap for status and control records.
3110 */
3111 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3112 struct vm_area_struct *area)
3113 {
3114 return -ENXIO;
3115 }
3116 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3117 struct vm_area_struct *area)
3118 {
3119 return -ENXIO;
3120 }
3121 #endif /* coherent mmap */
3122
3123 static inline struct page *
3124 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3125 {
3126 void *vaddr = substream->runtime->dma_area + ofs;
3127 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3128 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3129 return virt_to_page(CAC_ADDR(vaddr));
3130 #endif
3131 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3132 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3133 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3134 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3135 /* assume dma_handle set via pfn_to_phys() in
3136 * mm/dma-noncoherent.c
3137 */
3138 return pfn_to_page(addr >> PAGE_SHIFT);
3139 }
3140 #endif
3141 return virt_to_page(vaddr);
3142 }
3143
3144 /*
3145 * fault callback for mmapping a RAM page
3146 */
3147 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3148 struct vm_fault *vmf)
3149 {
3150 struct snd_pcm_substream *substream = area->vm_private_data;
3151 struct snd_pcm_runtime *runtime;
3152 unsigned long offset;
3153 struct page * page;
3154 size_t dma_bytes;
3155
3156 if (substream == NULL)
3157 return VM_FAULT_SIGBUS;
3158 runtime = substream->runtime;
3159 offset = vmf->pgoff << PAGE_SHIFT;
3160 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3161 if (offset > dma_bytes - PAGE_SIZE)
3162 return VM_FAULT_SIGBUS;
3163 if (substream->ops->page)
3164 page = substream->ops->page(substream, offset);
3165 else
3166 page = snd_pcm_default_page_ops(substream, offset);
3167 if (!page)
3168 return VM_FAULT_SIGBUS;
3169 get_page(page);
3170 vmf->page = page;
3171 return 0;
3172 }
3173
3174 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3175 .open = snd_pcm_mmap_data_open,
3176 .close = snd_pcm_mmap_data_close,
3177 };
3178
3179 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3180 .open = snd_pcm_mmap_data_open,
3181 .close = snd_pcm_mmap_data_close,
3182 .fault = snd_pcm_mmap_data_fault,
3183 };
3184
3185 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3186 /* This should be defined / handled globally! */
3187 #ifdef CONFIG_ARM
3188 #define ARCH_HAS_DMA_MMAP_COHERENT
3189 #endif
3190 #endif
3191
3192 /*
3193 * mmap the DMA buffer on RAM
3194 */
3195 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3196 struct vm_area_struct *area)
3197 {
3198 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3199 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3200 if (!substream->ops->page &&
3201 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3202 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3203 area,
3204 substream->runtime->dma_area,
3205 substream->runtime->dma_addr,
3206 area->vm_end - area->vm_start);
3207 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3208 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3209 !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3210 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3211 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3212 /* mmap with fault handler */
3213 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3214 return 0;
3215 }
3216 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3217
3218 /*
3219 * mmap the DMA buffer on I/O memory area
3220 */
3221 #if SNDRV_PCM_INFO_MMAP_IOMEM
3222 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3223 struct vm_area_struct *area)
3224 {
3225 long size;
3226 unsigned long offset;
3227
3228 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3229 area->vm_flags |= VM_IO;
3230 size = area->vm_end - area->vm_start;
3231 offset = area->vm_pgoff << PAGE_SHIFT;
3232 if (io_remap_pfn_range(area, area->vm_start,
3233 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3234 size, area->vm_page_prot))
3235 return -EAGAIN;
3236 return 0;
3237 }
3238
3239 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3240 #endif /* SNDRV_PCM_INFO_MMAP */
3241
3242 /*
3243 * mmap DMA buffer
3244 */
3245 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3246 struct vm_area_struct *area)
3247 {
3248 struct snd_pcm_runtime *runtime;
3249 long size;
3250 unsigned long offset;
3251 size_t dma_bytes;
3252 int err;
3253
3254 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3255 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3256 return -EINVAL;
3257 } else {
3258 if (!(area->vm_flags & VM_READ))
3259 return -EINVAL;
3260 }
3261 runtime = substream->runtime;
3262 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3263 return -EBADFD;
3264 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3265 return -ENXIO;
3266 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3267 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3268 return -EINVAL;
3269 size = area->vm_end - area->vm_start;
3270 offset = area->vm_pgoff << PAGE_SHIFT;
3271 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3272 if ((size_t)size > dma_bytes)
3273 return -EINVAL;
3274 if (offset > dma_bytes - size)
3275 return -EINVAL;
3276
3277 area->vm_ops = &snd_pcm_vm_ops_data;
3278 area->vm_private_data = substream;
3279 if (substream->ops->mmap)
3280 err = substream->ops->mmap(substream, area);
3281 else
3282 err = snd_pcm_lib_default_mmap(substream, area);
3283 if (!err)
3284 atomic_inc(&substream->mmap_count);
3285 return err;
3286 }
3287
3288 EXPORT_SYMBOL(snd_pcm_mmap_data);
3289
3290 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3291 {
3292 struct snd_pcm_file * pcm_file;
3293 struct snd_pcm_substream *substream;
3294 unsigned long offset;
3295
3296 pcm_file = file->private_data;
3297 substream = pcm_file->substream;
3298 if (PCM_RUNTIME_CHECK(substream))
3299 return -ENXIO;
3300
3301 offset = area->vm_pgoff << PAGE_SHIFT;
3302 switch (offset) {
3303 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3304 if (pcm_file->no_compat_mmap)
3305 return -ENXIO;
3306 return snd_pcm_mmap_status(substream, file, area);
3307 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3308 if (pcm_file->no_compat_mmap)
3309 return -ENXIO;
3310 return snd_pcm_mmap_control(substream, file, area);
3311 default:
3312 return snd_pcm_mmap_data(substream, file, area);
3313 }
3314 return 0;
3315 }
3316
3317 static int snd_pcm_fasync(int fd, struct file * file, int on)
3318 {
3319 struct snd_pcm_file * pcm_file;
3320 struct snd_pcm_substream *substream;
3321 struct snd_pcm_runtime *runtime;
3322
3323 pcm_file = file->private_data;
3324 substream = pcm_file->substream;
3325 if (PCM_RUNTIME_CHECK(substream))
3326 return -ENXIO;
3327 runtime = substream->runtime;
3328 return fasync_helper(fd, file, on, &runtime->fasync);
3329 }
3330
3331 /*
3332 * ioctl32 compat
3333 */
3334 #ifdef CONFIG_COMPAT
3335 #include "pcm_compat.c"
3336 #else
3337 #define snd_pcm_ioctl_compat NULL
3338 #endif
3339
3340 /*
3341 * To be removed helpers to keep binary compatibility
3342 */
3343
3344 #ifdef CONFIG_SND_SUPPORT_OLD_API
3345 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3346 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3347
3348 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3349 struct snd_pcm_hw_params_old *oparams)
3350 {
3351 unsigned int i;
3352
3353 memset(params, 0, sizeof(*params));
3354 params->flags = oparams->flags;
3355 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3356 params->masks[i].bits[0] = oparams->masks[i];
3357 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3358 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3359 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3360 params->info = oparams->info;
3361 params->msbits = oparams->msbits;
3362 params->rate_num = oparams->rate_num;
3363 params->rate_den = oparams->rate_den;
3364 params->fifo_size = oparams->fifo_size;
3365 }
3366
3367 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3368 struct snd_pcm_hw_params *params)
3369 {
3370 unsigned int i;
3371
3372 memset(oparams, 0, sizeof(*oparams));
3373 oparams->flags = params->flags;
3374 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3375 oparams->masks[i] = params->masks[i].bits[0];
3376 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3377 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3378 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3379 oparams->info = params->info;
3380 oparams->msbits = params->msbits;
3381 oparams->rate_num = params->rate_num;
3382 oparams->rate_den = params->rate_den;
3383 oparams->fifo_size = params->fifo_size;
3384 }
3385
3386 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3387 struct snd_pcm_hw_params_old __user * _oparams)
3388 {
3389 struct snd_pcm_hw_params *params;
3390 struct snd_pcm_hw_params_old *oparams = NULL;
3391 int err;
3392
3393 params = kmalloc(sizeof(*params), GFP_KERNEL);
3394 if (!params)
3395 return -ENOMEM;
3396
3397 oparams = memdup_user(_oparams, sizeof(*oparams));
3398 if (IS_ERR(oparams)) {
3399 err = PTR_ERR(oparams);
3400 goto out;
3401 }
3402 snd_pcm_hw_convert_from_old_params(params, oparams);
3403 err = snd_pcm_hw_refine(substream, params);
3404 snd_pcm_hw_convert_to_old_params(oparams, params);
3405 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3406 if (!err)
3407 err = -EFAULT;
3408 }
3409
3410 kfree(oparams);
3411 out:
3412 kfree(params);
3413 return err;
3414 }
3415
3416 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3417 struct snd_pcm_hw_params_old __user * _oparams)
3418 {
3419 struct snd_pcm_hw_params *params;
3420 struct snd_pcm_hw_params_old *oparams = NULL;
3421 int err;
3422
3423 params = kmalloc(sizeof(*params), GFP_KERNEL);
3424 if (!params)
3425 return -ENOMEM;
3426
3427 oparams = memdup_user(_oparams, sizeof(*oparams));
3428 if (IS_ERR(oparams)) {
3429 err = PTR_ERR(oparams);
3430 goto out;
3431 }
3432 snd_pcm_hw_convert_from_old_params(params, oparams);
3433 err = snd_pcm_hw_params(substream, params);
3434 snd_pcm_hw_convert_to_old_params(oparams, params);
3435 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3436 if (!err)
3437 err = -EFAULT;
3438 }
3439
3440 kfree(oparams);
3441 out:
3442 kfree(params);
3443 return err;
3444 }
3445 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3446
3447 #ifndef CONFIG_MMU
3448 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3449 unsigned long addr,
3450 unsigned long len,
3451 unsigned long pgoff,
3452 unsigned long flags)
3453 {
3454 struct snd_pcm_file *pcm_file = file->private_data;
3455 struct snd_pcm_substream *substream = pcm_file->substream;
3456 struct snd_pcm_runtime *runtime = substream->runtime;
3457 unsigned long offset = pgoff << PAGE_SHIFT;
3458
3459 switch (offset) {
3460 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3461 return (unsigned long)runtime->status;
3462 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3463 return (unsigned long)runtime->control;
3464 default:
3465 return (unsigned long)runtime->dma_area + offset;
3466 }
3467 }
3468 #else
3469 # define snd_pcm_get_unmapped_area NULL
3470 #endif
3471
3472 /*
3473 * Register section
3474 */
3475
3476 const struct file_operations snd_pcm_f_ops[2] = {
3477 {
3478 .owner = THIS_MODULE,
3479 .write = snd_pcm_write,
3480 .aio_write = snd_pcm_aio_write,
3481 .open = snd_pcm_playback_open,
3482 .release = snd_pcm_release,
3483 .llseek = no_llseek,
3484 .poll = snd_pcm_playback_poll,
3485 .unlocked_ioctl = snd_pcm_playback_ioctl,
3486 .compat_ioctl = snd_pcm_ioctl_compat,
3487 .mmap = snd_pcm_mmap,
3488 .fasync = snd_pcm_fasync,
3489 .get_unmapped_area = snd_pcm_get_unmapped_area,
3490 },
3491 {
3492 .owner = THIS_MODULE,
3493 .read = snd_pcm_read,
3494 .aio_read = snd_pcm_aio_read,
3495 .open = snd_pcm_capture_open,
3496 .release = snd_pcm_release,
3497 .llseek = no_llseek,
3498 .poll = snd_pcm_capture_poll,
3499 .unlocked_ioctl = snd_pcm_capture_ioctl,
3500 .compat_ioctl = snd_pcm_ioctl_compat,
3501 .mmap = snd_pcm_mmap,
3502 .fasync = snd_pcm_fasync,
3503 .get_unmapped_area = snd_pcm_get_unmapped_area,
3504 }
3505 };
kernel source for telekom puls (alcatel/mediatek)