Merge tag 'sound-5.1-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai...
[muen/linux.git] / sound / core / pcm_native.c
1 /*
2  *  Digital Audio (PCM) abstract layer
3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4  *
5  *
6  *   This program is free software; you can redistribute it and/or modify
7  *   it under the terms of the GNU General Public License as published by
8  *   the Free Software Foundation; either version 2 of the License, or
9  *   (at your option) any later version.
10  *
11  *   This program is distributed in the hope that it will be useful,
12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *   GNU General Public License for more details.
15  *
16  *   You should have received a copy of the GNU General Public License
17  *   along with this program; if not, write to the Free Software
18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
19  *
20  */
21
22 #include <linux/mm.h>
23 #include <linux/module.h>
24 #include <linux/file.h>
25 #include <linux/slab.h>
26 #include <linux/sched/signal.h>
27 #include <linux/time.h>
28 #include <linux/pm_qos.h>
29 #include <linux/io.h>
30 #include <linux/dma-mapping.h>
31 #include <sound/core.h>
32 #include <sound/control.h>
33 #include <sound/info.h>
34 #include <sound/pcm.h>
35 #include <sound/pcm_params.h>
36 #include <sound/timer.h>
37 #include <sound/minors.h>
38 #include <linux/uio.h>
39 #include <linux/delay.h>
40
41 #include "pcm_local.h"
42
43 #ifdef CONFIG_SND_DEBUG
44 #define CREATE_TRACE_POINTS
45 #include "pcm_param_trace.h"
46 #else
47 #define trace_hw_mask_param_enabled()           0
48 #define trace_hw_interval_param_enabled()       0
49 #define trace_hw_mask_param(substream, type, index, prev, curr)
50 #define trace_hw_interval_param(substream, type, index, prev, curr)
51 #endif
52
53 /*
54  *  Compatibility
55  */
56
57 struct snd_pcm_hw_params_old {
58         unsigned int flags;
59         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
60                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
61         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
62                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
63         unsigned int rmask;
64         unsigned int cmask;
65         unsigned int info;
66         unsigned int msbits;
67         unsigned int rate_num;
68         unsigned int rate_den;
69         snd_pcm_uframes_t fifo_size;
70         unsigned char reserved[64];
71 };
72
73 #ifdef CONFIG_SND_SUPPORT_OLD_API
74 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
75 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
76
77 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
78                                       struct snd_pcm_hw_params_old __user * _oparams);
79 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
80                                       struct snd_pcm_hw_params_old __user * _oparams);
81 #endif
82 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
83
84 /*
85  *
86  */
87
88 static DECLARE_RWSEM(snd_pcm_link_rwsem);
89
90 void snd_pcm_group_init(struct snd_pcm_group *group)
91 {
92         spin_lock_init(&group->lock);
93         mutex_init(&group->mutex);
94         INIT_LIST_HEAD(&group->substreams);
95         refcount_set(&group->refs, 0);
96 }
97
98 /* define group lock helpers */
99 #define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \
100 static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \
101 { \
102         if (nonatomic) \
103                 mutex_ ## mutex_action(&group->mutex); \
104         else \
105                 spin_ ## action(&group->lock); \
106 }
107
108 DEFINE_PCM_GROUP_LOCK(lock, lock);
109 DEFINE_PCM_GROUP_LOCK(unlock, unlock);
110 DEFINE_PCM_GROUP_LOCK(lock_irq, lock);
111 DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock);
112
113 /**
114  * snd_pcm_stream_lock - Lock the PCM stream
115  * @substream: PCM substream
116  *
117  * This locks the PCM stream's spinlock or mutex depending on the nonatomic
118  * flag of the given substream.  This also takes the global link rw lock
119  * (or rw sem), too, for avoiding the race with linked streams.
120  */
121 void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
122 {
123         snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic);
124 }
125 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
126
127 /**
128  * snd_pcm_stream_lock - Unlock the PCM stream
129  * @substream: PCM substream
130  *
131  * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
132  */
133 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
134 {
135         snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic);
136 }
137 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
138
139 /**
140  * snd_pcm_stream_lock_irq - Lock the PCM stream
141  * @substream: PCM substream
142  *
143  * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
144  * IRQ (only when nonatomic is false).  In nonatomic case, this is identical
145  * as snd_pcm_stream_lock().
146  */
147 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
148 {
149         snd_pcm_group_lock_irq(&substream->self_group,
150                                substream->pcm->nonatomic);
151 }
152 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
153
154 /**
155  * snd_pcm_stream_unlock_irq - Unlock the PCM stream
156  * @substream: PCM substream
157  *
158  * This is a counter-part of snd_pcm_stream_lock_irq().
159  */
160 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
161 {
162         snd_pcm_group_unlock_irq(&substream->self_group,
163                                  substream->pcm->nonatomic);
164 }
165 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
166
167 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
168 {
169         unsigned long flags = 0;
170         if (substream->pcm->nonatomic)
171                 mutex_lock(&substream->self_group.mutex);
172         else
173                 spin_lock_irqsave(&substream->self_group.lock, flags);
174         return flags;
175 }
176 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
177
178 /**
179  * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
180  * @substream: PCM substream
181  * @flags: irq flags
182  *
183  * This is a counter-part of snd_pcm_stream_lock_irqsave().
184  */
185 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
186                                       unsigned long flags)
187 {
188         if (substream->pcm->nonatomic)
189                 mutex_unlock(&substream->self_group.mutex);
190         else
191                 spin_unlock_irqrestore(&substream->self_group.lock, flags);
192 }
193 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
194
195 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
196 {
197         struct snd_pcm *pcm = substream->pcm;
198         struct snd_pcm_str *pstr = substream->pstr;
199
200         memset(info, 0, sizeof(*info));
201         info->card = pcm->card->number;
202         info->device = pcm->device;
203         info->stream = substream->stream;
204         info->subdevice = substream->number;
205         strlcpy(info->id, pcm->id, sizeof(info->id));
206         strlcpy(info->name, pcm->name, sizeof(info->name));
207         info->dev_class = pcm->dev_class;
208         info->dev_subclass = pcm->dev_subclass;
209         info->subdevices_count = pstr->substream_count;
210         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
211         strlcpy(info->subname, substream->name, sizeof(info->subname));
212
213         return 0;
214 }
215
216 int snd_pcm_info_user(struct snd_pcm_substream *substream,
217                       struct snd_pcm_info __user * _info)
218 {
219         struct snd_pcm_info *info;
220         int err;
221
222         info = kmalloc(sizeof(*info), GFP_KERNEL);
223         if (! info)
224                 return -ENOMEM;
225         err = snd_pcm_info(substream, info);
226         if (err >= 0) {
227                 if (copy_to_user(_info, info, sizeof(*info)))
228                         err = -EFAULT;
229         }
230         kfree(info);
231         return err;
232 }
233
234 static bool hw_support_mmap(struct snd_pcm_substream *substream)
235 {
236         if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
237                 return false;
238         /* architecture supports dma_mmap_coherent()? */
239 #if defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) || !defined(CONFIG_HAS_DMA)
240         if (!substream->ops->mmap &&
241             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
242                 return false;
243 #endif
244         return true;
245 }
246
247 static int constrain_mask_params(struct snd_pcm_substream *substream,
248                                  struct snd_pcm_hw_params *params)
249 {
250         struct snd_pcm_hw_constraints *constrs =
251                                         &substream->runtime->hw_constraints;
252         struct snd_mask *m;
253         unsigned int k;
254         struct snd_mask old_mask;
255         int changed;
256
257         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
258                 m = hw_param_mask(params, k);
259                 if (snd_mask_empty(m))
260                         return -EINVAL;
261
262                 /* This parameter is not requested to change by a caller. */
263                 if (!(params->rmask & (1 << k)))
264                         continue;
265
266                 if (trace_hw_mask_param_enabled())
267                         old_mask = *m;
268
269                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
270                 if (changed < 0)
271                         return changed;
272                 if (changed == 0)
273                         continue;
274
275                 /* Set corresponding flag so that the caller gets it. */
276                 trace_hw_mask_param(substream, k, 0, &old_mask, m);
277                 params->cmask |= 1 << k;
278         }
279
280         return 0;
281 }
282
283 static int constrain_interval_params(struct snd_pcm_substream *substream,
284                                      struct snd_pcm_hw_params *params)
285 {
286         struct snd_pcm_hw_constraints *constrs =
287                                         &substream->runtime->hw_constraints;
288         struct snd_interval *i;
289         unsigned int k;
290         struct snd_interval old_interval;
291         int changed;
292
293         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
294                 i = hw_param_interval(params, k);
295                 if (snd_interval_empty(i))
296                         return -EINVAL;
297
298                 /* This parameter is not requested to change by a caller. */
299                 if (!(params->rmask & (1 << k)))
300                         continue;
301
302                 if (trace_hw_interval_param_enabled())
303                         old_interval = *i;
304
305                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
306                 if (changed < 0)
307                         return changed;
308                 if (changed == 0)
309                         continue;
310
311                 /* Set corresponding flag so that the caller gets it. */
312                 trace_hw_interval_param(substream, k, 0, &old_interval, i);
313                 params->cmask |= 1 << k;
314         }
315
316         return 0;
317 }
318
319 static int constrain_params_by_rules(struct snd_pcm_substream *substream,
320                                      struct snd_pcm_hw_params *params)
321 {
322         struct snd_pcm_hw_constraints *constrs =
323                                         &substream->runtime->hw_constraints;
324         unsigned int k;
325         unsigned int *rstamps;
326         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
327         unsigned int stamp;
328         struct snd_pcm_hw_rule *r;
329         unsigned int d;
330         struct snd_mask old_mask;
331         struct snd_interval old_interval;
332         bool again;
333         int changed, err = 0;
334
335         /*
336          * Each application of rule has own sequence number.
337          *
338          * Each member of 'rstamps' array represents the sequence number of
339          * recent application of corresponding rule.
340          */
341         rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
342         if (!rstamps)
343                 return -ENOMEM;
344
345         /*
346          * Each member of 'vstamps' array represents the sequence number of
347          * recent application of rule in which corresponding parameters were
348          * changed.
349          *
350          * In initial state, elements corresponding to parameters requested by
351          * a caller is 1. For unrequested parameters, corresponding members
352          * have 0 so that the parameters are never changed anymore.
353          */
354         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
355                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
356
357         /* Due to the above design, actual sequence number starts at 2. */
358         stamp = 2;
359 retry:
360         /* Apply all rules in order. */
361         again = false;
362         for (k = 0; k < constrs->rules_num; k++) {
363                 r = &constrs->rules[k];
364
365                 /*
366                  * Check condition bits of this rule. When the rule has
367                  * some condition bits, parameter without the bits is
368                  * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
369                  * is an example of the condition bits.
370                  */
371                 if (r->cond && !(r->cond & params->flags))
372                         continue;
373
374                 /*
375                  * The 'deps' array includes maximum three dependencies
376                  * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth
377                  * member of this array is a sentinel and should be
378                  * negative value.
379                  *
380                  * This rule should be processed in this time when dependent
381                  * parameters were changed at former applications of the other
382                  * rules.
383                  */
384                 for (d = 0; r->deps[d] >= 0; d++) {
385                         if (vstamps[r->deps[d]] > rstamps[k])
386                                 break;
387                 }
388                 if (r->deps[d] < 0)
389                         continue;
390
391                 if (trace_hw_mask_param_enabled()) {
392                         if (hw_is_mask(r->var))
393                                 old_mask = *hw_param_mask(params, r->var);
394                 }
395                 if (trace_hw_interval_param_enabled()) {
396                         if (hw_is_interval(r->var))
397                                 old_interval = *hw_param_interval(params, r->var);
398                 }
399
400                 changed = r->func(params, r);
401                 if (changed < 0) {
402                         err = changed;
403                         goto out;
404                 }
405
406                 /*
407                  * When the parameter is changed, notify it to the caller
408                  * by corresponding returned bit, then preparing for next
409                  * iteration.
410                  */
411                 if (changed && r->var >= 0) {
412                         if (hw_is_mask(r->var)) {
413                                 trace_hw_mask_param(substream, r->var,
414                                         k + 1, &old_mask,
415                                         hw_param_mask(params, r->var));
416                         }
417                         if (hw_is_interval(r->var)) {
418                                 trace_hw_interval_param(substream, r->var,
419                                         k + 1, &old_interval,
420                                         hw_param_interval(params, r->var));
421                         }
422
423                         params->cmask |= (1 << r->var);
424                         vstamps[r->var] = stamp;
425                         again = true;
426                 }
427
428                 rstamps[k] = stamp++;
429         }
430
431         /* Iterate to evaluate all rules till no parameters are changed. */
432         if (again)
433                 goto retry;
434
435  out:
436         kfree(rstamps);
437         return err;
438 }
439
440 static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
441                                      struct snd_pcm_hw_params *params)
442 {
443         const struct snd_interval *i;
444         const struct snd_mask *m;
445         int err;
446
447         if (!params->msbits) {
448                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
449                 if (snd_interval_single(i))
450                         params->msbits = snd_interval_value(i);
451         }
452
453         if (!params->rate_den) {
454                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
455                 if (snd_interval_single(i)) {
456                         params->rate_num = snd_interval_value(i);
457                         params->rate_den = 1;
458                 }
459         }
460
461         if (!params->fifo_size) {
462                 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
463                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
464                 if (snd_mask_single(m) && snd_interval_single(i)) {
465                         err = substream->ops->ioctl(substream,
466                                         SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
467                         if (err < 0)
468                                 return err;
469                 }
470         }
471
472         if (!params->info) {
473                 params->info = substream->runtime->hw.info;
474                 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
475                                   SNDRV_PCM_INFO_DRAIN_TRIGGER);
476                 if (!hw_support_mmap(substream))
477                         params->info &= ~(SNDRV_PCM_INFO_MMAP |
478                                           SNDRV_PCM_INFO_MMAP_VALID);
479         }
480
481         return 0;
482 }
483
484 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
485                       struct snd_pcm_hw_params *params)
486 {
487         int err;
488
489         params->info = 0;
490         params->fifo_size = 0;
491         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
492                 params->msbits = 0;
493         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
494                 params->rate_num = 0;
495                 params->rate_den = 0;
496         }
497
498         err = constrain_mask_params(substream, params);
499         if (err < 0)
500                 return err;
501
502         err = constrain_interval_params(substream, params);
503         if (err < 0)
504                 return err;
505
506         err = constrain_params_by_rules(substream, params);
507         if (err < 0)
508                 return err;
509
510         params->rmask = 0;
511
512         return 0;
513 }
514 EXPORT_SYMBOL(snd_pcm_hw_refine);
515
516 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
517                                   struct snd_pcm_hw_params __user * _params)
518 {
519         struct snd_pcm_hw_params *params;
520         int err;
521
522         params = memdup_user(_params, sizeof(*params));
523         if (IS_ERR(params))
524                 return PTR_ERR(params);
525
526         err = snd_pcm_hw_refine(substream, params);
527         if (err < 0)
528                 goto end;
529
530         err = fixup_unreferenced_params(substream, params);
531         if (err < 0)
532                 goto end;
533
534         if (copy_to_user(_params, params, sizeof(*params)))
535                 err = -EFAULT;
536 end:
537         kfree(params);
538         return err;
539 }
540
541 static int period_to_usecs(struct snd_pcm_runtime *runtime)
542 {
543         int usecs;
544
545         if (! runtime->rate)
546                 return -1; /* invalid */
547
548         /* take 75% of period time as the deadline */
549         usecs = (750000 / runtime->rate) * runtime->period_size;
550         usecs += ((750000 % runtime->rate) * runtime->period_size) /
551                 runtime->rate;
552
553         return usecs;
554 }
555
556 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
557 {
558         snd_pcm_stream_lock_irq(substream);
559         if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
560                 substream->runtime->status->state = state;
561         snd_pcm_stream_unlock_irq(substream);
562 }
563
564 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
565                                         int event)
566 {
567 #ifdef CONFIG_SND_PCM_TIMER
568         if (substream->timer)
569                 snd_timer_notify(substream->timer, event,
570                                         &substream->runtime->trigger_tstamp);
571 #endif
572 }
573
574 /**
575  * snd_pcm_hw_param_choose - choose a configuration defined by @params
576  * @pcm: PCM instance
577  * @params: the hw_params instance
578  *
579  * Choose one configuration from configuration space defined by @params.
580  * The configuration chosen is that obtained fixing in this order:
581  * first access, first format, first subformat, min channels,
582  * min rate, min period time, max buffer size, min tick time
583  *
584  * Return: Zero if successful, or a negative error code on failure.
585  */
586 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
587                                     struct snd_pcm_hw_params *params)
588 {
589         static const int vars[] = {
590                 SNDRV_PCM_HW_PARAM_ACCESS,
591                 SNDRV_PCM_HW_PARAM_FORMAT,
592                 SNDRV_PCM_HW_PARAM_SUBFORMAT,
593                 SNDRV_PCM_HW_PARAM_CHANNELS,
594                 SNDRV_PCM_HW_PARAM_RATE,
595                 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
596                 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
597                 SNDRV_PCM_HW_PARAM_TICK_TIME,
598                 -1
599         };
600         const int *v;
601         struct snd_mask old_mask;
602         struct snd_interval old_interval;
603         int changed;
604
605         for (v = vars; *v != -1; v++) {
606                 /* Keep old parameter to trace. */
607                 if (trace_hw_mask_param_enabled()) {
608                         if (hw_is_mask(*v))
609                                 old_mask = *hw_param_mask(params, *v);
610                 }
611                 if (trace_hw_interval_param_enabled()) {
612                         if (hw_is_interval(*v))
613                                 old_interval = *hw_param_interval(params, *v);
614                 }
615                 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
616                         changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
617                 else
618                         changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
619                 if (changed < 0)
620                         return changed;
621                 if (changed == 0)
622                         continue;
623
624                 /* Trace the changed parameter. */
625                 if (hw_is_mask(*v)) {
626                         trace_hw_mask_param(pcm, *v, 0, &old_mask,
627                                             hw_param_mask(params, *v));
628                 }
629                 if (hw_is_interval(*v)) {
630                         trace_hw_interval_param(pcm, *v, 0, &old_interval,
631                                                 hw_param_interval(params, *v));
632                 }
633         }
634
635         return 0;
636 }
637
638 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
639                              struct snd_pcm_hw_params *params)
640 {
641         struct snd_pcm_runtime *runtime;
642         int err, usecs;
643         unsigned int bits;
644         snd_pcm_uframes_t frames;
645
646         if (PCM_RUNTIME_CHECK(substream))
647                 return -ENXIO;
648         runtime = substream->runtime;
649         snd_pcm_stream_lock_irq(substream);
650         switch (runtime->status->state) {
651         case SNDRV_PCM_STATE_OPEN:
652         case SNDRV_PCM_STATE_SETUP:
653         case SNDRV_PCM_STATE_PREPARED:
654                 break;
655         default:
656                 snd_pcm_stream_unlock_irq(substream);
657                 return -EBADFD;
658         }
659         snd_pcm_stream_unlock_irq(substream);
660 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
661         if (!substream->oss.oss)
662 #endif
663                 if (atomic_read(&substream->mmap_count))
664                         return -EBADFD;
665
666         params->rmask = ~0U;
667         err = snd_pcm_hw_refine(substream, params);
668         if (err < 0)
669                 goto _error;
670
671         err = snd_pcm_hw_params_choose(substream, params);
672         if (err < 0)
673                 goto _error;
674
675         err = fixup_unreferenced_params(substream, params);
676         if (err < 0)
677                 goto _error;
678
679         if (substream->ops->hw_params != NULL) {
680                 err = substream->ops->hw_params(substream, params);
681                 if (err < 0)
682                         goto _error;
683         }
684
685         runtime->access = params_access(params);
686         runtime->format = params_format(params);
687         runtime->subformat = params_subformat(params);
688         runtime->channels = params_channels(params);
689         runtime->rate = params_rate(params);
690         runtime->period_size = params_period_size(params);
691         runtime->periods = params_periods(params);
692         runtime->buffer_size = params_buffer_size(params);
693         runtime->info = params->info;
694         runtime->rate_num = params->rate_num;
695         runtime->rate_den = params->rate_den;
696         runtime->no_period_wakeup =
697                         (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
698                         (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
699
700         bits = snd_pcm_format_physical_width(runtime->format);
701         runtime->sample_bits = bits;
702         bits *= runtime->channels;
703         runtime->frame_bits = bits;
704         frames = 1;
705         while (bits % 8 != 0) {
706                 bits *= 2;
707                 frames *= 2;
708         }
709         runtime->byte_align = bits / 8;
710         runtime->min_align = frames;
711
712         /* Default sw params */
713         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
714         runtime->period_step = 1;
715         runtime->control->avail_min = runtime->period_size;
716         runtime->start_threshold = 1;
717         runtime->stop_threshold = runtime->buffer_size;
718         runtime->silence_threshold = 0;
719         runtime->silence_size = 0;
720         runtime->boundary = runtime->buffer_size;
721         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
722                 runtime->boundary *= 2;
723
724         snd_pcm_timer_resolution_change(substream);
725         snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
726
727         if (pm_qos_request_active(&substream->latency_pm_qos_req))
728                 pm_qos_remove_request(&substream->latency_pm_qos_req);
729         if ((usecs = period_to_usecs(runtime)) >= 0)
730                 pm_qos_add_request(&substream->latency_pm_qos_req,
731                                    PM_QOS_CPU_DMA_LATENCY, usecs);
732         return 0;
733  _error:
734         /* hardware might be unusable from this time,
735            so we force application to retry to set
736            the correct hardware parameter settings */
737         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
738         if (substream->ops->hw_free != NULL)
739                 substream->ops->hw_free(substream);
740         return err;
741 }
742
743 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
744                                   struct snd_pcm_hw_params __user * _params)
745 {
746         struct snd_pcm_hw_params *params;
747         int err;
748
749         params = memdup_user(_params, sizeof(*params));
750         if (IS_ERR(params))
751                 return PTR_ERR(params);
752
753         err = snd_pcm_hw_params(substream, params);
754         if (err < 0)
755                 goto end;
756
757         if (copy_to_user(_params, params, sizeof(*params)))
758                 err = -EFAULT;
759 end:
760         kfree(params);
761         return err;
762 }
763
764 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
765 {
766         struct snd_pcm_runtime *runtime;
767         int result = 0;
768
769         if (PCM_RUNTIME_CHECK(substream))
770                 return -ENXIO;
771         runtime = substream->runtime;
772         snd_pcm_stream_lock_irq(substream);
773         switch (runtime->status->state) {
774         case SNDRV_PCM_STATE_SETUP:
775         case SNDRV_PCM_STATE_PREPARED:
776                 break;
777         default:
778                 snd_pcm_stream_unlock_irq(substream);
779                 return -EBADFD;
780         }
781         snd_pcm_stream_unlock_irq(substream);
782         if (atomic_read(&substream->mmap_count))
783                 return -EBADFD;
784         if (substream->ops->hw_free)
785                 result = substream->ops->hw_free(substream);
786         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
787         pm_qos_remove_request(&substream->latency_pm_qos_req);
788         return result;
789 }
790
791 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
792                              struct snd_pcm_sw_params *params)
793 {
794         struct snd_pcm_runtime *runtime;
795         int err;
796
797         if (PCM_RUNTIME_CHECK(substream))
798                 return -ENXIO;
799         runtime = substream->runtime;
800         snd_pcm_stream_lock_irq(substream);
801         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
802                 snd_pcm_stream_unlock_irq(substream);
803                 return -EBADFD;
804         }
805         snd_pcm_stream_unlock_irq(substream);
806
807         if (params->tstamp_mode < 0 ||
808             params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
809                 return -EINVAL;
810         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
811             params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
812                 return -EINVAL;
813         if (params->avail_min == 0)
814                 return -EINVAL;
815         if (params->silence_size >= runtime->boundary) {
816                 if (params->silence_threshold != 0)
817                         return -EINVAL;
818         } else {
819                 if (params->silence_size > params->silence_threshold)
820                         return -EINVAL;
821                 if (params->silence_threshold > runtime->buffer_size)
822                         return -EINVAL;
823         }
824         err = 0;
825         snd_pcm_stream_lock_irq(substream);
826         runtime->tstamp_mode = params->tstamp_mode;
827         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
828                 runtime->tstamp_type = params->tstamp_type;
829         runtime->period_step = params->period_step;
830         runtime->control->avail_min = params->avail_min;
831         runtime->start_threshold = params->start_threshold;
832         runtime->stop_threshold = params->stop_threshold;
833         runtime->silence_threshold = params->silence_threshold;
834         runtime->silence_size = params->silence_size;
835         params->boundary = runtime->boundary;
836         if (snd_pcm_running(substream)) {
837                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
838                     runtime->silence_size > 0)
839                         snd_pcm_playback_silence(substream, ULONG_MAX);
840                 err = snd_pcm_update_state(substream, runtime);
841         }
842         snd_pcm_stream_unlock_irq(substream);
843         return err;
844 }
845
846 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
847                                   struct snd_pcm_sw_params __user * _params)
848 {
849         struct snd_pcm_sw_params params;
850         int err;
851         if (copy_from_user(&params, _params, sizeof(params)))
852                 return -EFAULT;
853         err = snd_pcm_sw_params(substream, &params);
854         if (copy_to_user(_params, &params, sizeof(params)))
855                 return -EFAULT;
856         return err;
857 }
858
859 static inline snd_pcm_uframes_t
860 snd_pcm_calc_delay(struct snd_pcm_substream *substream)
861 {
862         snd_pcm_uframes_t delay;
863
864         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
865                 delay = snd_pcm_playback_hw_avail(substream->runtime);
866         else
867                 delay = snd_pcm_capture_avail(substream->runtime);
868         return delay + substream->runtime->delay;
869 }
870
871 int snd_pcm_status(struct snd_pcm_substream *substream,
872                    struct snd_pcm_status *status)
873 {
874         struct snd_pcm_runtime *runtime = substream->runtime;
875
876         snd_pcm_stream_lock_irq(substream);
877
878         snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
879                                         &runtime->audio_tstamp_config);
880
881         /* backwards compatible behavior */
882         if (runtime->audio_tstamp_config.type_requested ==
883                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
884                 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
885                         runtime->audio_tstamp_config.type_requested =
886                                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
887                 else
888                         runtime->audio_tstamp_config.type_requested =
889                                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
890                 runtime->audio_tstamp_report.valid = 0;
891         } else
892                 runtime->audio_tstamp_report.valid = 1;
893
894         status->state = runtime->status->state;
895         status->suspended_state = runtime->status->suspended_state;
896         if (status->state == SNDRV_PCM_STATE_OPEN)
897                 goto _end;
898         status->trigger_tstamp = runtime->trigger_tstamp;
899         if (snd_pcm_running(substream)) {
900                 snd_pcm_update_hw_ptr(substream);
901                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
902                         status->tstamp = runtime->status->tstamp;
903                         status->driver_tstamp = runtime->driver_tstamp;
904                         status->audio_tstamp =
905                                 runtime->status->audio_tstamp;
906                         if (runtime->audio_tstamp_report.valid == 1)
907                                 /* backwards compatibility, no report provided in COMPAT mode */
908                                 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
909                                                                 &status->audio_tstamp_accuracy,
910                                                                 &runtime->audio_tstamp_report);
911
912                         goto _tstamp_end;
913                 }
914         } else {
915                 /* get tstamp only in fallback mode and only if enabled */
916                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
917                         snd_pcm_gettime(runtime, &status->tstamp);
918         }
919  _tstamp_end:
920         status->appl_ptr = runtime->control->appl_ptr;
921         status->hw_ptr = runtime->status->hw_ptr;
922         status->avail = snd_pcm_avail(substream);
923         status->delay = snd_pcm_running(substream) ?
924                 snd_pcm_calc_delay(substream) : 0;
925         status->avail_max = runtime->avail_max;
926         status->overrange = runtime->overrange;
927         runtime->avail_max = 0;
928         runtime->overrange = 0;
929  _end:
930         snd_pcm_stream_unlock_irq(substream);
931         return 0;
932 }
933
934 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
935                                struct snd_pcm_status __user * _status,
936                                bool ext)
937 {
938         struct snd_pcm_status status;
939         int res;
940
941         memset(&status, 0, sizeof(status));
942         /*
943          * with extension, parameters are read/write,
944          * get audio_tstamp_data from user,
945          * ignore rest of status structure
946          */
947         if (ext && get_user(status.audio_tstamp_data,
948                                 (u32 __user *)(&_status->audio_tstamp_data)))
949                 return -EFAULT;
950         res = snd_pcm_status(substream, &status);
951         if (res < 0)
952                 return res;
953         if (copy_to_user(_status, &status, sizeof(status)))
954                 return -EFAULT;
955         return 0;
956 }
957
958 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
959                                 struct snd_pcm_channel_info * info)
960 {
961         struct snd_pcm_runtime *runtime;
962         unsigned int channel;
963         
964         channel = info->channel;
965         runtime = substream->runtime;
966         snd_pcm_stream_lock_irq(substream);
967         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
968                 snd_pcm_stream_unlock_irq(substream);
969                 return -EBADFD;
970         }
971         snd_pcm_stream_unlock_irq(substream);
972         if (channel >= runtime->channels)
973                 return -EINVAL;
974         memset(info, 0, sizeof(*info));
975         info->channel = channel;
976         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
977 }
978
979 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
980                                      struct snd_pcm_channel_info __user * _info)
981 {
982         struct snd_pcm_channel_info info;
983         int res;
984         
985         if (copy_from_user(&info, _info, sizeof(info)))
986                 return -EFAULT;
987         res = snd_pcm_channel_info(substream, &info);
988         if (res < 0)
989                 return res;
990         if (copy_to_user(_info, &info, sizeof(info)))
991                 return -EFAULT;
992         return 0;
993 }
994
995 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
996 {
997         struct snd_pcm_runtime *runtime = substream->runtime;
998         if (runtime->trigger_master == NULL)
999                 return;
1000         if (runtime->trigger_master == substream) {
1001                 if (!runtime->trigger_tstamp_latched)
1002                         snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1003         } else {
1004                 snd_pcm_trigger_tstamp(runtime->trigger_master);
1005                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
1006         }
1007         runtime->trigger_master = NULL;
1008 }
1009
1010 struct action_ops {
1011         int (*pre_action)(struct snd_pcm_substream *substream, int state);
1012         int (*do_action)(struct snd_pcm_substream *substream, int state);
1013         void (*undo_action)(struct snd_pcm_substream *substream, int state);
1014         void (*post_action)(struct snd_pcm_substream *substream, int state);
1015 };
1016
1017 /*
1018  *  this functions is core for handling of linked stream
1019  *  Note: the stream state might be changed also on failure
1020  *  Note2: call with calling stream lock + link lock
1021  */
1022 static int snd_pcm_action_group(const struct action_ops *ops,
1023                                 struct snd_pcm_substream *substream,
1024                                 int state, int do_lock)
1025 {
1026         struct snd_pcm_substream *s = NULL;
1027         struct snd_pcm_substream *s1;
1028         int res = 0, depth = 1;
1029
1030         snd_pcm_group_for_each_entry(s, substream) {
1031                 if (do_lock && s != substream) {
1032                         if (s->pcm->nonatomic)
1033                                 mutex_lock_nested(&s->self_group.mutex, depth);
1034                         else
1035                                 spin_lock_nested(&s->self_group.lock, depth);
1036                         depth++;
1037                 }
1038                 res = ops->pre_action(s, state);
1039                 if (res < 0)
1040                         goto _unlock;
1041         }
1042         snd_pcm_group_for_each_entry(s, substream) {
1043                 res = ops->do_action(s, state);
1044                 if (res < 0) {
1045                         if (ops->undo_action) {
1046                                 snd_pcm_group_for_each_entry(s1, substream) {
1047                                         if (s1 == s) /* failed stream */
1048                                                 break;
1049                                         ops->undo_action(s1, state);
1050                                 }
1051                         }
1052                         s = NULL; /* unlock all */
1053                         goto _unlock;
1054                 }
1055         }
1056         snd_pcm_group_for_each_entry(s, substream) {
1057                 ops->post_action(s, state);
1058         }
1059  _unlock:
1060         if (do_lock) {
1061                 /* unlock streams */
1062                 snd_pcm_group_for_each_entry(s1, substream) {
1063                         if (s1 != substream) {
1064                                 if (s1->pcm->nonatomic)
1065                                         mutex_unlock(&s1->self_group.mutex);
1066                                 else
1067                                         spin_unlock(&s1->self_group.lock);
1068                         }
1069                         if (s1 == s)    /* end */
1070                                 break;
1071                 }
1072         }
1073         return res;
1074 }
1075
1076 /*
1077  *  Note: call with stream lock
1078  */
1079 static int snd_pcm_action_single(const struct action_ops *ops,
1080                                  struct snd_pcm_substream *substream,
1081                                  int state)
1082 {
1083         int res;
1084         
1085         res = ops->pre_action(substream, state);
1086         if (res < 0)
1087                 return res;
1088         res = ops->do_action(substream, state);
1089         if (res == 0)
1090                 ops->post_action(substream, state);
1091         else if (ops->undo_action)
1092                 ops->undo_action(substream, state);
1093         return res;
1094 }
1095
1096 static void snd_pcm_group_assign(struct snd_pcm_substream *substream,
1097                                  struct snd_pcm_group *new_group)
1098 {
1099         substream->group = new_group;
1100         list_move(&substream->link_list, &new_group->substreams);
1101 }
1102
1103 /*
1104  * Unref and unlock the group, but keep the stream lock;
1105  * when the group becomes empty and no longer referred, destroy itself
1106  */
1107 static void snd_pcm_group_unref(struct snd_pcm_group *group,
1108                                 struct snd_pcm_substream *substream)
1109 {
1110         bool do_free;
1111
1112         if (!group)
1113                 return;
1114         do_free = refcount_dec_and_test(&group->refs) &&
1115                 list_empty(&group->substreams);
1116         snd_pcm_group_unlock(group, substream->pcm->nonatomic);
1117         if (do_free)
1118                 kfree(group);
1119 }
1120
1121 /*
1122  * Lock the group inside a stream lock and reference it;
1123  * return the locked group object, or NULL if not linked
1124  */
1125 static struct snd_pcm_group *
1126 snd_pcm_stream_group_ref(struct snd_pcm_substream *substream)
1127 {
1128         bool nonatomic = substream->pcm->nonatomic;
1129         struct snd_pcm_group *group;
1130         bool trylock;
1131
1132         for (;;) {
1133                 if (!snd_pcm_stream_linked(substream))
1134                         return NULL;
1135                 group = substream->group;
1136                 /* block freeing the group object */
1137                 refcount_inc(&group->refs);
1138
1139                 trylock = nonatomic ? mutex_trylock(&group->mutex) :
1140                         spin_trylock(&group->lock);
1141                 if (trylock)
1142                         break; /* OK */
1143
1144                 /* re-lock for avoiding ABBA deadlock */
1145                 snd_pcm_stream_unlock(substream);
1146                 snd_pcm_group_lock(group, nonatomic);
1147                 snd_pcm_stream_lock(substream);
1148
1149                 /* check the group again; the above opens a small race window */
1150                 if (substream->group == group)
1151                         break; /* OK */
1152                 /* group changed, try again */
1153                 snd_pcm_group_unref(group, substream);
1154         }
1155         return group;
1156 }
1157
1158 /*
1159  *  Note: call with stream lock
1160  */
1161 static int snd_pcm_action(const struct action_ops *ops,
1162                           struct snd_pcm_substream *substream,
1163                           int state)
1164 {
1165         struct snd_pcm_group *group;
1166         int res;
1167
1168         group = snd_pcm_stream_group_ref(substream);
1169         if (group)
1170                 res = snd_pcm_action_group(ops, substream, state, 1);
1171         else
1172                 res = snd_pcm_action_single(ops, substream, state);
1173         snd_pcm_group_unref(group, substream);
1174         return res;
1175 }
1176
1177 /*
1178  *  Note: don't use any locks before
1179  */
1180 static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1181                                    struct snd_pcm_substream *substream,
1182                                    int state)
1183 {
1184         int res;
1185
1186         snd_pcm_stream_lock_irq(substream);
1187         res = snd_pcm_action(ops, substream, state);
1188         snd_pcm_stream_unlock_irq(substream);
1189         return res;
1190 }
1191
1192 /*
1193  */
1194 static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1195                                     struct snd_pcm_substream *substream,
1196                                     int state)
1197 {
1198         int res;
1199
1200         /* Guarantee the group members won't change during non-atomic action */
1201         down_read(&snd_pcm_link_rwsem);
1202         if (snd_pcm_stream_linked(substream))
1203                 res = snd_pcm_action_group(ops, substream, state, 0);
1204         else
1205                 res = snd_pcm_action_single(ops, substream, state);
1206         up_read(&snd_pcm_link_rwsem);
1207         return res;
1208 }
1209
1210 /*
1211  * start callbacks
1212  */
1213 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
1214 {
1215         struct snd_pcm_runtime *runtime = substream->runtime;
1216         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
1217                 return -EBADFD;
1218         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1219             !snd_pcm_playback_data(substream))
1220                 return -EPIPE;
1221         runtime->trigger_tstamp_latched = false;
1222         runtime->trigger_master = substream;
1223         return 0;
1224 }
1225
1226 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
1227 {
1228         if (substream->runtime->trigger_master != substream)
1229                 return 0;
1230         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1231 }
1232
1233 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
1234 {
1235         if (substream->runtime->trigger_master == substream)
1236                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1237 }
1238
1239 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
1240 {
1241         struct snd_pcm_runtime *runtime = substream->runtime;
1242         snd_pcm_trigger_tstamp(substream);
1243         runtime->hw_ptr_jiffies = jiffies;
1244         runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 
1245                                                             runtime->rate;
1246         runtime->status->state = state;
1247         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1248             runtime->silence_size > 0)
1249                 snd_pcm_playback_silence(substream, ULONG_MAX);
1250         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1251 }
1252
1253 static const struct action_ops snd_pcm_action_start = {
1254         .pre_action = snd_pcm_pre_start,
1255         .do_action = snd_pcm_do_start,
1256         .undo_action = snd_pcm_undo_start,
1257         .post_action = snd_pcm_post_start
1258 };
1259
1260 /**
1261  * snd_pcm_start - start all linked streams
1262  * @substream: the PCM substream instance
1263  *
1264  * Return: Zero if successful, or a negative error code.
1265  * The stream lock must be acquired before calling this function.
1266  */
1267 int snd_pcm_start(struct snd_pcm_substream *substream)
1268 {
1269         return snd_pcm_action(&snd_pcm_action_start, substream,
1270                               SNDRV_PCM_STATE_RUNNING);
1271 }
1272
1273 /* take the stream lock and start the streams */
1274 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1275 {
1276         return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1277                                        SNDRV_PCM_STATE_RUNNING);
1278 }
1279
1280 /*
1281  * stop callbacks
1282  */
1283 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1284 {
1285         struct snd_pcm_runtime *runtime = substream->runtime;
1286         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1287                 return -EBADFD;
1288         runtime->trigger_master = substream;
1289         return 0;
1290 }
1291
1292 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1293 {
1294         if (substream->runtime->trigger_master == substream &&
1295             snd_pcm_running(substream))
1296                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1297         return 0; /* unconditonally stop all substreams */
1298 }
1299
1300 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1301 {
1302         struct snd_pcm_runtime *runtime = substream->runtime;
1303         if (runtime->status->state != state) {
1304                 snd_pcm_trigger_tstamp(substream);
1305                 runtime->status->state = state;
1306                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1307         }
1308         wake_up(&runtime->sleep);
1309         wake_up(&runtime->tsleep);
1310 }
1311
1312 static const struct action_ops snd_pcm_action_stop = {
1313         .pre_action = snd_pcm_pre_stop,
1314         .do_action = snd_pcm_do_stop,
1315         .post_action = snd_pcm_post_stop
1316 };
1317
1318 /**
1319  * snd_pcm_stop - try to stop all running streams in the substream group
1320  * @substream: the PCM substream instance
1321  * @state: PCM state after stopping the stream
1322  *
1323  * The state of each stream is then changed to the given state unconditionally.
1324  *
1325  * Return: Zero if successful, or a negative error code.
1326  */
1327 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1328 {
1329         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1330 }
1331 EXPORT_SYMBOL(snd_pcm_stop);
1332
1333 /**
1334  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1335  * @substream: the PCM substream
1336  *
1337  * After stopping, the state is changed to SETUP.
1338  * Unlike snd_pcm_stop(), this affects only the given stream.
1339  *
1340  * Return: Zero if succesful, or a negative error code.
1341  */
1342 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1343 {
1344         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1345                                      SNDRV_PCM_STATE_SETUP);
1346 }
1347
1348 /**
1349  * snd_pcm_stop_xrun - stop the running streams as XRUN
1350  * @substream: the PCM substream instance
1351  *
1352  * This stops the given running substream (and all linked substreams) as XRUN.
1353  * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1354  *
1355  * Return: Zero if successful, or a negative error code.
1356  */
1357 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1358 {
1359         unsigned long flags;
1360
1361         snd_pcm_stream_lock_irqsave(substream, flags);
1362         if (substream->runtime && snd_pcm_running(substream))
1363                 __snd_pcm_xrun(substream);
1364         snd_pcm_stream_unlock_irqrestore(substream, flags);
1365         return 0;
1366 }
1367 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1368
1369 /*
1370  * pause callbacks
1371  */
1372 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1373 {
1374         struct snd_pcm_runtime *runtime = substream->runtime;
1375         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1376                 return -ENOSYS;
1377         if (push) {
1378                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1379                         return -EBADFD;
1380         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1381                 return -EBADFD;
1382         runtime->trigger_master = substream;
1383         return 0;
1384 }
1385
1386 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1387 {
1388         if (substream->runtime->trigger_master != substream)
1389                 return 0;
1390         /* some drivers might use hw_ptr to recover from the pause -
1391            update the hw_ptr now */
1392         if (push)
1393                 snd_pcm_update_hw_ptr(substream);
1394         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1395          * a delta between the current jiffies, this gives a large enough
1396          * delta, effectively to skip the check once.
1397          */
1398         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1399         return substream->ops->trigger(substream,
1400                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1401                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1402 }
1403
1404 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1405 {
1406         if (substream->runtime->trigger_master == substream)
1407                 substream->ops->trigger(substream,
1408                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1409                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1410 }
1411
1412 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1413 {
1414         struct snd_pcm_runtime *runtime = substream->runtime;
1415         snd_pcm_trigger_tstamp(substream);
1416         if (push) {
1417                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1418                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1419                 wake_up(&runtime->sleep);
1420                 wake_up(&runtime->tsleep);
1421         } else {
1422                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1423                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1424         }
1425 }
1426
1427 static const struct action_ops snd_pcm_action_pause = {
1428         .pre_action = snd_pcm_pre_pause,
1429         .do_action = snd_pcm_do_pause,
1430         .undo_action = snd_pcm_undo_pause,
1431         .post_action = snd_pcm_post_pause
1432 };
1433
1434 /*
1435  * Push/release the pause for all linked streams.
1436  */
1437 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1438 {
1439         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1440 }
1441
1442 #ifdef CONFIG_PM
1443 /* suspend */
1444
1445 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1446 {
1447         struct snd_pcm_runtime *runtime = substream->runtime;
1448         switch (runtime->status->state) {
1449         case SNDRV_PCM_STATE_SUSPENDED:
1450                 return -EBUSY;
1451         /* unresumable PCM state; return -EBUSY for skipping suspend */
1452         case SNDRV_PCM_STATE_OPEN:
1453         case SNDRV_PCM_STATE_SETUP:
1454         case SNDRV_PCM_STATE_DISCONNECTED:
1455                 return -EBUSY;
1456         }
1457         runtime->trigger_master = substream;
1458         return 0;
1459 }
1460
1461 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1462 {
1463         struct snd_pcm_runtime *runtime = substream->runtime;
1464         if (runtime->trigger_master != substream)
1465                 return 0;
1466         if (! snd_pcm_running(substream))
1467                 return 0;
1468         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1469         return 0; /* suspend unconditionally */
1470 }
1471
1472 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1473 {
1474         struct snd_pcm_runtime *runtime = substream->runtime;
1475         snd_pcm_trigger_tstamp(substream);
1476         runtime->status->suspended_state = runtime->status->state;
1477         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1478         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1479         wake_up(&runtime->sleep);
1480         wake_up(&runtime->tsleep);
1481 }
1482
1483 static const struct action_ops snd_pcm_action_suspend = {
1484         .pre_action = snd_pcm_pre_suspend,
1485         .do_action = snd_pcm_do_suspend,
1486         .post_action = snd_pcm_post_suspend
1487 };
1488
1489 /*
1490  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1491  * @substream: the PCM substream
1492  *
1493  * After this call, all streams are changed to SUSPENDED state.
1494  *
1495  * Return: Zero if successful, or a negative error code.
1496  */
1497 static int snd_pcm_suspend(struct snd_pcm_substream *substream)
1498 {
1499         int err;
1500         unsigned long flags;
1501
1502         snd_pcm_stream_lock_irqsave(substream, flags);
1503         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1504         snd_pcm_stream_unlock_irqrestore(substream, flags);
1505         return err;
1506 }
1507
1508 /**
1509  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1510  * @pcm: the PCM instance
1511  *
1512  * After this call, all streams are changed to SUSPENDED state.
1513  *
1514  * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1515  */
1516 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1517 {
1518         struct snd_pcm_substream *substream;
1519         int stream, err = 0;
1520
1521         if (! pcm)
1522                 return 0;
1523
1524         for (stream = 0; stream < 2; stream++) {
1525                 for (substream = pcm->streams[stream].substream;
1526                      substream; substream = substream->next) {
1527                         /* FIXME: the open/close code should lock this as well */
1528                         if (substream->runtime == NULL)
1529                                 continue;
1530
1531                         /*
1532                          * Skip BE dai link PCM's that are internal and may
1533                          * not have their substream ops set.
1534                          */
1535                         if (!substream->ops)
1536                                 continue;
1537
1538                         err = snd_pcm_suspend(substream);
1539                         if (err < 0 && err != -EBUSY)
1540                                 return err;
1541                 }
1542         }
1543         return 0;
1544 }
1545 EXPORT_SYMBOL(snd_pcm_suspend_all);
1546
1547 /* resume */
1548
1549 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1550 {
1551         struct snd_pcm_runtime *runtime = substream->runtime;
1552         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1553                 return -ENOSYS;
1554         runtime->trigger_master = substream;
1555         return 0;
1556 }
1557
1558 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1559 {
1560         struct snd_pcm_runtime *runtime = substream->runtime;
1561         if (runtime->trigger_master != substream)
1562                 return 0;
1563         /* DMA not running previously? */
1564         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1565             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1566              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1567                 return 0;
1568         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1569 }
1570
1571 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1572 {
1573         if (substream->runtime->trigger_master == substream &&
1574             snd_pcm_running(substream))
1575                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1576 }
1577
1578 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1579 {
1580         struct snd_pcm_runtime *runtime = substream->runtime;
1581         snd_pcm_trigger_tstamp(substream);
1582         runtime->status->state = runtime->status->suspended_state;
1583         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1584 }
1585
1586 static const struct action_ops snd_pcm_action_resume = {
1587         .pre_action = snd_pcm_pre_resume,
1588         .do_action = snd_pcm_do_resume,
1589         .undo_action = snd_pcm_undo_resume,
1590         .post_action = snd_pcm_post_resume
1591 };
1592
1593 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1594 {
1595         return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1596 }
1597
1598 #else
1599
1600 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1601 {
1602         return -ENOSYS;
1603 }
1604
1605 #endif /* CONFIG_PM */
1606
1607 /*
1608  * xrun ioctl
1609  *
1610  * Change the RUNNING stream(s) to XRUN state.
1611  */
1612 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1613 {
1614         struct snd_pcm_runtime *runtime = substream->runtime;
1615         int result;
1616
1617         snd_pcm_stream_lock_irq(substream);
1618         switch (runtime->status->state) {
1619         case SNDRV_PCM_STATE_XRUN:
1620                 result = 0;     /* already there */
1621                 break;
1622         case SNDRV_PCM_STATE_RUNNING:
1623                 __snd_pcm_xrun(substream);
1624                 result = 0;
1625                 break;
1626         default:
1627                 result = -EBADFD;
1628         }
1629         snd_pcm_stream_unlock_irq(substream);
1630         return result;
1631 }
1632
1633 /*
1634  * reset ioctl
1635  */
1636 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1637 {
1638         struct snd_pcm_runtime *runtime = substream->runtime;
1639         switch (runtime->status->state) {
1640         case SNDRV_PCM_STATE_RUNNING:
1641         case SNDRV_PCM_STATE_PREPARED:
1642         case SNDRV_PCM_STATE_PAUSED:
1643         case SNDRV_PCM_STATE_SUSPENDED:
1644                 return 0;
1645         default:
1646                 return -EBADFD;
1647         }
1648 }
1649
1650 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1651 {
1652         struct snd_pcm_runtime *runtime = substream->runtime;
1653         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1654         if (err < 0)
1655                 return err;
1656         runtime->hw_ptr_base = 0;
1657         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1658                 runtime->status->hw_ptr % runtime->period_size;
1659         runtime->silence_start = runtime->status->hw_ptr;
1660         runtime->silence_filled = 0;
1661         return 0;
1662 }
1663
1664 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1665 {
1666         struct snd_pcm_runtime *runtime = substream->runtime;
1667         runtime->control->appl_ptr = runtime->status->hw_ptr;
1668         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1669             runtime->silence_size > 0)
1670                 snd_pcm_playback_silence(substream, ULONG_MAX);
1671 }
1672
1673 static const struct action_ops snd_pcm_action_reset = {
1674         .pre_action = snd_pcm_pre_reset,
1675         .do_action = snd_pcm_do_reset,
1676         .post_action = snd_pcm_post_reset
1677 };
1678
1679 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1680 {
1681         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1682 }
1683
1684 /*
1685  * prepare ioctl
1686  */
1687 /* we use the second argument for updating f_flags */
1688 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1689                                int f_flags)
1690 {
1691         struct snd_pcm_runtime *runtime = substream->runtime;
1692         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1693             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1694                 return -EBADFD;
1695         if (snd_pcm_running(substream))
1696                 return -EBUSY;
1697         substream->f_flags = f_flags;
1698         return 0;
1699 }
1700
1701 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1702 {
1703         int err;
1704         err = substream->ops->prepare(substream);
1705         if (err < 0)
1706                 return err;
1707         return snd_pcm_do_reset(substream, 0);
1708 }
1709
1710 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1711 {
1712         struct snd_pcm_runtime *runtime = substream->runtime;
1713         runtime->control->appl_ptr = runtime->status->hw_ptr;
1714         snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1715 }
1716
1717 static const struct action_ops snd_pcm_action_prepare = {
1718         .pre_action = snd_pcm_pre_prepare,
1719         .do_action = snd_pcm_do_prepare,
1720         .post_action = snd_pcm_post_prepare
1721 };
1722
1723 /**
1724  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1725  * @substream: the PCM substream instance
1726  * @file: file to refer f_flags
1727  *
1728  * Return: Zero if successful, or a negative error code.
1729  */
1730 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1731                            struct file *file)
1732 {
1733         int f_flags;
1734
1735         if (file)
1736                 f_flags = file->f_flags;
1737         else
1738                 f_flags = substream->f_flags;
1739
1740         snd_pcm_stream_lock_irq(substream);
1741         switch (substream->runtime->status->state) {
1742         case SNDRV_PCM_STATE_PAUSED:
1743                 snd_pcm_pause(substream, 0);
1744                 /* fallthru */
1745         case SNDRV_PCM_STATE_SUSPENDED:
1746                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1747                 break;
1748         }
1749         snd_pcm_stream_unlock_irq(substream);
1750
1751         return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1752                                         substream, f_flags);
1753 }
1754
1755 /*
1756  * drain ioctl
1757  */
1758
1759 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1760 {
1761         struct snd_pcm_runtime *runtime = substream->runtime;
1762         switch (runtime->status->state) {
1763         case SNDRV_PCM_STATE_OPEN:
1764         case SNDRV_PCM_STATE_DISCONNECTED:
1765         case SNDRV_PCM_STATE_SUSPENDED:
1766                 return -EBADFD;
1767         }
1768         runtime->trigger_master = substream;
1769         return 0;
1770 }
1771
1772 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1773 {
1774         struct snd_pcm_runtime *runtime = substream->runtime;
1775         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1776                 switch (runtime->status->state) {
1777                 case SNDRV_PCM_STATE_PREPARED:
1778                         /* start playback stream if possible */
1779                         if (! snd_pcm_playback_empty(substream)) {
1780                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1781                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1782                         } else {
1783                                 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1784                         }
1785                         break;
1786                 case SNDRV_PCM_STATE_RUNNING:
1787                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1788                         break;
1789                 case SNDRV_PCM_STATE_XRUN:
1790                         runtime->status->state = SNDRV_PCM_STATE_SETUP;
1791                         break;
1792                 default:
1793                         break;
1794                 }
1795         } else {
1796                 /* stop running stream */
1797                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1798                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1799                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1800                         snd_pcm_do_stop(substream, new_state);
1801                         snd_pcm_post_stop(substream, new_state);
1802                 }
1803         }
1804
1805         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1806             runtime->trigger_master == substream &&
1807             (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1808                 return substream->ops->trigger(substream,
1809                                                SNDRV_PCM_TRIGGER_DRAIN);
1810
1811         return 0;
1812 }
1813
1814 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1815 {
1816 }
1817
1818 static const struct action_ops snd_pcm_action_drain_init = {
1819         .pre_action = snd_pcm_pre_drain_init,
1820         .do_action = snd_pcm_do_drain_init,
1821         .post_action = snd_pcm_post_drain_init
1822 };
1823
1824 /*
1825  * Drain the stream(s).
1826  * When the substream is linked, sync until the draining of all playback streams
1827  * is finished.
1828  * After this call, all streams are supposed to be either SETUP or DRAINING
1829  * (capture only) state.
1830  */
1831 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1832                          struct file *file)
1833 {
1834         struct snd_card *card;
1835         struct snd_pcm_runtime *runtime;
1836         struct snd_pcm_substream *s;
1837         struct snd_pcm_group *group;
1838         wait_queue_entry_t wait;
1839         int result = 0;
1840         int nonblock = 0;
1841
1842         card = substream->pcm->card;
1843         runtime = substream->runtime;
1844
1845         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1846                 return -EBADFD;
1847
1848         if (file) {
1849                 if (file->f_flags & O_NONBLOCK)
1850                         nonblock = 1;
1851         } else if (substream->f_flags & O_NONBLOCK)
1852                 nonblock = 1;
1853
1854         snd_pcm_stream_lock_irq(substream);
1855         /* resume pause */
1856         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1857                 snd_pcm_pause(substream, 0);
1858
1859         /* pre-start/stop - all running streams are changed to DRAINING state */
1860         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1861         if (result < 0)
1862                 goto unlock;
1863         /* in non-blocking, we don't wait in ioctl but let caller poll */
1864         if (nonblock) {
1865                 result = -EAGAIN;
1866                 goto unlock;
1867         }
1868
1869         for (;;) {
1870                 long tout;
1871                 struct snd_pcm_runtime *to_check;
1872                 if (signal_pending(current)) {
1873                         result = -ERESTARTSYS;
1874                         break;
1875                 }
1876                 /* find a substream to drain */
1877                 to_check = NULL;
1878                 group = snd_pcm_stream_group_ref(substream);
1879                 snd_pcm_group_for_each_entry(s, substream) {
1880                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1881                                 continue;
1882                         runtime = s->runtime;
1883                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1884                                 to_check = runtime;
1885                                 break;
1886                         }
1887                 }
1888                 snd_pcm_group_unref(group, substream);
1889                 if (!to_check)
1890                         break; /* all drained */
1891                 init_waitqueue_entry(&wait, current);
1892                 add_wait_queue(&to_check->sleep, &wait);
1893                 snd_pcm_stream_unlock_irq(substream);
1894                 if (runtime->no_period_wakeup)
1895                         tout = MAX_SCHEDULE_TIMEOUT;
1896                 else {
1897                         tout = 10;
1898                         if (runtime->rate) {
1899                                 long t = runtime->period_size * 2 / runtime->rate;
1900                                 tout = max(t, tout);
1901                         }
1902                         tout = msecs_to_jiffies(tout * 1000);
1903                 }
1904                 tout = schedule_timeout_interruptible(tout);
1905
1906                 snd_pcm_stream_lock_irq(substream);
1907                 group = snd_pcm_stream_group_ref(substream);
1908                 snd_pcm_group_for_each_entry(s, substream) {
1909                         if (s->runtime == to_check) {
1910                                 remove_wait_queue(&to_check->sleep, &wait);
1911                                 break;
1912                         }
1913                 }
1914                 snd_pcm_group_unref(group, substream);
1915
1916                 if (card->shutdown) {
1917                         result = -ENODEV;
1918                         break;
1919                 }
1920                 if (tout == 0) {
1921                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1922                                 result = -ESTRPIPE;
1923                         else {
1924                                 dev_dbg(substream->pcm->card->dev,
1925                                         "playback drain error (DMA or IRQ trouble?)\n");
1926                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1927                                 result = -EIO;
1928                         }
1929                         break;
1930                 }
1931         }
1932
1933  unlock:
1934         snd_pcm_stream_unlock_irq(substream);
1935
1936         return result;
1937 }
1938
1939 /*
1940  * drop ioctl
1941  *
1942  * Immediately put all linked substreams into SETUP state.
1943  */
1944 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1945 {
1946         struct snd_pcm_runtime *runtime;
1947         int result = 0;
1948         
1949         if (PCM_RUNTIME_CHECK(substream))
1950                 return -ENXIO;
1951         runtime = substream->runtime;
1952
1953         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1954             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1955                 return -EBADFD;
1956
1957         snd_pcm_stream_lock_irq(substream);
1958         /* resume pause */
1959         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1960                 snd_pcm_pause(substream, 0);
1961
1962         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1963         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1964         snd_pcm_stream_unlock_irq(substream);
1965
1966         return result;
1967 }
1968
1969
1970 static bool is_pcm_file(struct file *file)
1971 {
1972         struct inode *inode = file_inode(file);
1973         struct snd_pcm *pcm;
1974         unsigned int minor;
1975
1976         if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1977                 return false;
1978         minor = iminor(inode);
1979         pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
1980         if (!pcm)
1981                 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1982         if (!pcm)
1983                 return false;
1984         snd_card_unref(pcm->card);
1985         return true;
1986 }
1987
1988 /*
1989  * PCM link handling
1990  */
1991 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1992 {
1993         int res = 0;
1994         struct snd_pcm_file *pcm_file;
1995         struct snd_pcm_substream *substream1;
1996         struct snd_pcm_group *group, *target_group;
1997         bool nonatomic = substream->pcm->nonatomic;
1998         struct fd f = fdget(fd);
1999
2000         if (!f.file)
2001                 return -EBADFD;
2002         if (!is_pcm_file(f.file)) {
2003                 res = -EBADFD;
2004                 goto _badf;
2005         }
2006         pcm_file = f.file->private_data;
2007         substream1 = pcm_file->substream;
2008         group = kzalloc(sizeof(*group), GFP_KERNEL);
2009         if (!group) {
2010                 res = -ENOMEM;
2011                 goto _nolock;
2012         }
2013         snd_pcm_group_init(group);
2014
2015         down_write(&snd_pcm_link_rwsem);
2016         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
2017             substream->runtime->status->state != substream1->runtime->status->state ||
2018             substream->pcm->nonatomic != substream1->pcm->nonatomic) {
2019                 res = -EBADFD;
2020                 goto _end;
2021         }
2022         if (snd_pcm_stream_linked(substream1)) {
2023                 res = -EALREADY;
2024                 goto _end;
2025         }
2026
2027         snd_pcm_stream_lock_irq(substream);
2028         if (!snd_pcm_stream_linked(substream)) {
2029                 snd_pcm_group_assign(substream, group);
2030                 group = NULL; /* assigned, don't free this one below */
2031         }
2032         target_group = substream->group;
2033         snd_pcm_stream_unlock_irq(substream);
2034
2035         snd_pcm_group_lock_irq(target_group, nonatomic);
2036         snd_pcm_stream_lock(substream1);
2037         snd_pcm_group_assign(substream1, target_group);
2038         snd_pcm_stream_unlock(substream1);
2039         snd_pcm_group_unlock_irq(target_group, nonatomic);
2040  _end:
2041         up_write(&snd_pcm_link_rwsem);
2042  _nolock:
2043         kfree(group);
2044  _badf:
2045         fdput(f);
2046         return res;
2047 }
2048
2049 static void relink_to_local(struct snd_pcm_substream *substream)
2050 {
2051         snd_pcm_stream_lock(substream);
2052         snd_pcm_group_assign(substream, &substream->self_group);
2053         snd_pcm_stream_unlock(substream);
2054 }
2055
2056 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
2057 {
2058         struct snd_pcm_group *group;
2059         bool nonatomic = substream->pcm->nonatomic;
2060         bool do_free = false;
2061         int res = 0;
2062
2063         down_write(&snd_pcm_link_rwsem);
2064
2065         if (!snd_pcm_stream_linked(substream)) {
2066                 res = -EALREADY;
2067                 goto _end;
2068         }
2069
2070         group = substream->group;
2071         snd_pcm_group_lock_irq(group, nonatomic);
2072
2073         relink_to_local(substream);
2074
2075         /* detach the last stream, too */
2076         if (list_is_singular(&group->substreams)) {
2077                 relink_to_local(list_first_entry(&group->substreams,
2078                                                  struct snd_pcm_substream,
2079                                                  link_list));
2080                 do_free = !refcount_read(&group->refs);
2081         }
2082
2083         snd_pcm_group_unlock_irq(group, nonatomic);
2084         if (do_free)
2085                 kfree(group);
2086
2087        _end:
2088         up_write(&snd_pcm_link_rwsem);
2089         return res;
2090 }
2091
2092 /*
2093  * hw configurator
2094  */
2095 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2096                                struct snd_pcm_hw_rule *rule)
2097 {
2098         struct snd_interval t;
2099         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2100                      hw_param_interval_c(params, rule->deps[1]), &t);
2101         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2102 }
2103
2104 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2105                                struct snd_pcm_hw_rule *rule)
2106 {
2107         struct snd_interval t;
2108         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2109                      hw_param_interval_c(params, rule->deps[1]), &t);
2110         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2111 }
2112
2113 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2114                                    struct snd_pcm_hw_rule *rule)
2115 {
2116         struct snd_interval t;
2117         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2118                          hw_param_interval_c(params, rule->deps[1]),
2119                          (unsigned long) rule->private, &t);
2120         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2121 }
2122
2123 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2124                                    struct snd_pcm_hw_rule *rule)
2125 {
2126         struct snd_interval t;
2127         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2128                          (unsigned long) rule->private,
2129                          hw_param_interval_c(params, rule->deps[1]), &t);
2130         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2131 }
2132
2133 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2134                                   struct snd_pcm_hw_rule *rule)
2135 {
2136         unsigned int k;
2137         const struct snd_interval *i =
2138                                 hw_param_interval_c(params, rule->deps[0]);
2139         struct snd_mask m;
2140         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2141         snd_mask_any(&m);
2142         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2143                 int bits;
2144                 if (! snd_mask_test(mask, k))
2145                         continue;
2146                 bits = snd_pcm_format_physical_width(k);
2147                 if (bits <= 0)
2148                         continue; /* ignore invalid formats */
2149                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2150                         snd_mask_reset(&m, k);
2151         }
2152         return snd_mask_refine(mask, &m);
2153 }
2154
2155 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2156                                        struct snd_pcm_hw_rule *rule)
2157 {
2158         struct snd_interval t;
2159         unsigned int k;
2160         t.min = UINT_MAX;
2161         t.max = 0;
2162         t.openmin = 0;
2163         t.openmax = 0;
2164         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2165                 int bits;
2166                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2167                         continue;
2168                 bits = snd_pcm_format_physical_width(k);
2169                 if (bits <= 0)
2170                         continue; /* ignore invalid formats */
2171                 if (t.min > (unsigned)bits)
2172                         t.min = bits;
2173                 if (t.max < (unsigned)bits)
2174                         t.max = bits;
2175         }
2176         t.integer = 1;
2177         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2178 }
2179
2180 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2181 #error "Change this table"
2182 #endif
2183
2184 static const unsigned int rates[] = {
2185         5512, 8000, 11025, 16000, 22050, 32000, 44100,
2186         48000, 64000, 88200, 96000, 176400, 192000
2187 };
2188
2189 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2190         .count = ARRAY_SIZE(rates),
2191         .list = rates,
2192 };
2193
2194 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2195                                 struct snd_pcm_hw_rule *rule)
2196 {
2197         struct snd_pcm_hardware *hw = rule->private;
2198         return snd_interval_list(hw_param_interval(params, rule->var),
2199                                  snd_pcm_known_rates.count,
2200                                  snd_pcm_known_rates.list, hw->rates);
2201 }               
2202
2203 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2204                                             struct snd_pcm_hw_rule *rule)
2205 {
2206         struct snd_interval t;
2207         struct snd_pcm_substream *substream = rule->private;
2208         t.min = 0;
2209         t.max = substream->buffer_bytes_max;
2210         t.openmin = 0;
2211         t.openmax = 0;
2212         t.integer = 1;
2213         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2214 }               
2215
2216 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2217 {
2218         struct snd_pcm_runtime *runtime = substream->runtime;
2219         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2220         int k, err;
2221
2222         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2223                 snd_mask_any(constrs_mask(constrs, k));
2224         }
2225
2226         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2227                 snd_interval_any(constrs_interval(constrs, k));
2228         }
2229
2230         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2231         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2232         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2233         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2234         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2235
2236         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2237                                    snd_pcm_hw_rule_format, NULL,
2238                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2239         if (err < 0)
2240                 return err;
2241         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 
2242                                   snd_pcm_hw_rule_sample_bits, NULL,
2243                                   SNDRV_PCM_HW_PARAM_FORMAT, 
2244                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2245         if (err < 0)
2246                 return err;
2247         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 
2248                                   snd_pcm_hw_rule_div, NULL,
2249                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2250         if (err < 0)
2251                 return err;
2252         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
2253                                   snd_pcm_hw_rule_mul, NULL,
2254                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2255         if (err < 0)
2256                 return err;
2257         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
2258                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2259                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2260         if (err < 0)
2261                 return err;
2262         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
2263                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2264                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2265         if (err < 0)
2266                 return err;
2267         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 
2268                                   snd_pcm_hw_rule_div, NULL,
2269                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2270         if (err < 0)
2271                 return err;
2272         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
2273                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2274                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2275         if (err < 0)
2276                 return err;
2277         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
2278                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2279                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2280         if (err < 0)
2281                 return err;
2282         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 
2283                                   snd_pcm_hw_rule_div, NULL,
2284                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2285         if (err < 0)
2286                 return err;
2287         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
2288                                   snd_pcm_hw_rule_div, NULL,
2289                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2290         if (err < 0)
2291                 return err;
2292         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
2293                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2294                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2295         if (err < 0)
2296                 return err;
2297         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
2298                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2299                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2300         if (err < 0)
2301                 return err;
2302         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
2303                                   snd_pcm_hw_rule_mul, NULL,
2304                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2305         if (err < 0)
2306                 return err;
2307         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
2308                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2309                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2310         if (err < 0)
2311                 return err;
2312         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
2313                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2314                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2315         if (err < 0)
2316                 return err;
2317         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 
2318                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2319                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2320         if (err < 0)
2321                 return err;
2322         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 
2323                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2324                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2325         if (err < 0)
2326                 return err;
2327         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 
2328                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2329                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2330         if (err < 0)
2331                 return err;
2332         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 
2333                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2334                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2335         if (err < 0)
2336                 return err;
2337         return 0;
2338 }
2339
2340 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2341 {
2342         struct snd_pcm_runtime *runtime = substream->runtime;
2343         struct snd_pcm_hardware *hw = &runtime->hw;
2344         int err;
2345         unsigned int mask = 0;
2346
2347         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2348                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2349         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2350                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2351         if (hw_support_mmap(substream)) {
2352                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2353                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2354                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2355                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2356                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2357                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2358         }
2359         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2360         if (err < 0)
2361                 return err;
2362
2363         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2364         if (err < 0)
2365                 return err;
2366
2367         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2368         if (err < 0)
2369                 return err;
2370
2371         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2372                                            hw->channels_min, hw->channels_max);
2373         if (err < 0)
2374                 return err;
2375
2376         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2377                                            hw->rate_min, hw->rate_max);
2378         if (err < 0)
2379                 return err;
2380
2381         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2382                                            hw->period_bytes_min, hw->period_bytes_max);
2383         if (err < 0)
2384                 return err;
2385
2386         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2387                                            hw->periods_min, hw->periods_max);
2388         if (err < 0)
2389                 return err;
2390
2391         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2392                                            hw->period_bytes_min, hw->buffer_bytes_max);
2393         if (err < 0)
2394                 return err;
2395
2396         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 
2397                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
2398                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2399         if (err < 0)
2400                 return err;
2401
2402         /* FIXME: remove */
2403         if (runtime->dma_bytes) {
2404                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2405                 if (err < 0)
2406                         return err;
2407         }
2408
2409         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2410                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
2411                                           snd_pcm_hw_rule_rate, hw,
2412                                           SNDRV_PCM_HW_PARAM_RATE, -1);
2413                 if (err < 0)
2414                         return err;
2415         }
2416
2417         /* FIXME: this belong to lowlevel */
2418         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2419
2420         return 0;
2421 }
2422
2423 static void pcm_release_private(struct snd_pcm_substream *substream)
2424 {
2425         if (snd_pcm_stream_linked(substream))
2426                 snd_pcm_unlink(substream);
2427 }
2428
2429 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2430 {
2431         substream->ref_count--;
2432         if (substream->ref_count > 0)
2433                 return;
2434
2435         snd_pcm_drop(substream);
2436         if (substream->hw_opened) {
2437                 if (substream->ops->hw_free &&
2438                     substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
2439                         substream->ops->hw_free(substream);
2440                 substream->ops->close(substream);
2441                 substream->hw_opened = 0;
2442         }
2443         if (pm_qos_request_active(&substream->latency_pm_qos_req))
2444                 pm_qos_remove_request(&substream->latency_pm_qos_req);
2445         if (substream->pcm_release) {
2446                 substream->pcm_release(substream);
2447                 substream->pcm_release = NULL;
2448         }
2449         snd_pcm_detach_substream(substream);
2450 }
2451 EXPORT_SYMBOL(snd_pcm_release_substream);
2452
2453 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2454                            struct file *file,
2455                            struct snd_pcm_substream **rsubstream)
2456 {
2457         struct snd_pcm_substream *substream;
2458         int err;
2459
2460         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2461         if (err < 0)
2462                 return err;
2463         if (substream->ref_count > 1) {
2464                 *rsubstream = substream;
2465                 return 0;
2466         }
2467
2468         err = snd_pcm_hw_constraints_init(substream);
2469         if (err < 0) {
2470                 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2471                 goto error;
2472         }
2473
2474         if ((err = substream->ops->open(substream)) < 0)
2475                 goto error;
2476
2477         substream->hw_opened = 1;
2478
2479         err = snd_pcm_hw_constraints_complete(substream);
2480         if (err < 0) {
2481                 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2482                 goto error;
2483         }
2484
2485         *rsubstream = substream;
2486         return 0;
2487
2488  error:
2489         snd_pcm_release_substream(substream);
2490         return err;
2491 }
2492 EXPORT_SYMBOL(snd_pcm_open_substream);
2493
2494 static int snd_pcm_open_file(struct file *file,
2495                              struct snd_pcm *pcm,
2496                              int stream)
2497 {
2498         struct snd_pcm_file *pcm_file;
2499         struct snd_pcm_substream *substream;
2500         int err;
2501
2502         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2503         if (err < 0)
2504                 return err;
2505
2506         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2507         if (pcm_file == NULL) {
2508                 snd_pcm_release_substream(substream);
2509                 return -ENOMEM;
2510         }
2511         pcm_file->substream = substream;
2512         if (substream->ref_count == 1)
2513                 substream->pcm_release = pcm_release_private;
2514         file->private_data = pcm_file;
2515
2516         return 0;
2517 }
2518
2519 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2520 {
2521         struct snd_pcm *pcm;
2522         int err = nonseekable_open(inode, file);
2523         if (err < 0)
2524                 return err;
2525         pcm = snd_lookup_minor_data(iminor(inode),
2526                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2527         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2528         if (pcm)
2529                 snd_card_unref(pcm->card);
2530         return err;
2531 }
2532
2533 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2534 {
2535         struct snd_pcm *pcm;
2536         int err = nonseekable_open(inode, file);
2537         if (err < 0)
2538                 return err;
2539         pcm = snd_lookup_minor_data(iminor(inode),
2540                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2541         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2542         if (pcm)
2543                 snd_card_unref(pcm->card);
2544         return err;
2545 }
2546
2547 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2548 {
2549         int err;
2550         wait_queue_entry_t wait;
2551
2552         if (pcm == NULL) {
2553                 err = -ENODEV;
2554                 goto __error1;
2555         }
2556         err = snd_card_file_add(pcm->card, file);
2557         if (err < 0)
2558                 goto __error1;
2559         if (!try_module_get(pcm->card->module)) {
2560                 err = -EFAULT;
2561                 goto __error2;
2562         }
2563         init_waitqueue_entry(&wait, current);
2564         add_wait_queue(&pcm->open_wait, &wait);
2565         mutex_lock(&pcm->open_mutex);
2566         while (1) {
2567                 err = snd_pcm_open_file(file, pcm, stream);
2568                 if (err >= 0)
2569                         break;
2570                 if (err == -EAGAIN) {
2571                         if (file->f_flags & O_NONBLOCK) {
2572                                 err = -EBUSY;
2573                                 break;
2574                         }
2575                 } else
2576                         break;
2577                 set_current_state(TASK_INTERRUPTIBLE);
2578                 mutex_unlock(&pcm->open_mutex);
2579                 schedule();
2580                 mutex_lock(&pcm->open_mutex);
2581                 if (pcm->card->shutdown) {
2582                         err = -ENODEV;
2583                         break;
2584                 }
2585                 if (signal_pending(current)) {
2586                         err = -ERESTARTSYS;
2587                         break;
2588                 }
2589         }
2590         remove_wait_queue(&pcm->open_wait, &wait);
2591         mutex_unlock(&pcm->open_mutex);
2592         if (err < 0)
2593                 goto __error;
2594         return err;
2595
2596       __error:
2597         module_put(pcm->card->module);
2598       __error2:
2599         snd_card_file_remove(pcm->card, file);
2600       __error1:
2601         return err;
2602 }
2603
2604 static int snd_pcm_release(struct inode *inode, struct file *file)
2605 {
2606         struct snd_pcm *pcm;
2607         struct snd_pcm_substream *substream;
2608         struct snd_pcm_file *pcm_file;
2609
2610         pcm_file = file->private_data;
2611         substream = pcm_file->substream;
2612         if (snd_BUG_ON(!substream))
2613                 return -ENXIO;
2614         pcm = substream->pcm;
2615         mutex_lock(&pcm->open_mutex);
2616         snd_pcm_release_substream(substream);
2617         kfree(pcm_file);
2618         mutex_unlock(&pcm->open_mutex);
2619         wake_up(&pcm->open_wait);
2620         module_put(pcm->card->module);
2621         snd_card_file_remove(pcm->card, file);
2622         return 0;
2623 }
2624
2625 /* check and update PCM state; return 0 or a negative error
2626  * call this inside PCM lock
2627  */
2628 static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2629 {
2630         switch (substream->runtime->status->state) {
2631         case SNDRV_PCM_STATE_DRAINING:
2632                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2633                         return -EBADFD;
2634                 /* Fall through */
2635         case SNDRV_PCM_STATE_RUNNING:
2636                 return snd_pcm_update_hw_ptr(substream);
2637         case SNDRV_PCM_STATE_PREPARED:
2638         case SNDRV_PCM_STATE_PAUSED:
2639                 return 0;
2640         case SNDRV_PCM_STATE_SUSPENDED:
2641                 return -ESTRPIPE;
2642         case SNDRV_PCM_STATE_XRUN:
2643                 return -EPIPE;
2644         default:
2645                 return -EBADFD;
2646         }
2647 }
2648
2649 /* increase the appl_ptr; returns the processed frames or a negative error */
2650 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2651                                           snd_pcm_uframes_t frames,
2652                                            snd_pcm_sframes_t avail)
2653 {
2654         struct snd_pcm_runtime *runtime = substream->runtime;
2655         snd_pcm_sframes_t appl_ptr;
2656         int ret;
2657
2658         if (avail <= 0)
2659                 return 0;
2660         if (frames > (snd_pcm_uframes_t)avail)
2661                 frames = avail;
2662         appl_ptr = runtime->control->appl_ptr + frames;
2663         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2664                 appl_ptr -= runtime->boundary;
2665         ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2666         return ret < 0 ? ret : frames;
2667 }
2668
2669 /* decrease the appl_ptr; returns the processed frames or zero for error */
2670 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2671                                          snd_pcm_uframes_t frames,
2672                                          snd_pcm_sframes_t avail)
2673 {
2674         struct snd_pcm_runtime *runtime = substream->runtime;
2675         snd_pcm_sframes_t appl_ptr;
2676         int ret;
2677
2678         if (avail <= 0)
2679                 return 0;
2680         if (frames > (snd_pcm_uframes_t)avail)
2681                 frames = avail;
2682         appl_ptr = runtime->control->appl_ptr - frames;
2683         if (appl_ptr < 0)
2684                 appl_ptr += runtime->boundary;
2685         ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2686         /* NOTE: we return zero for errors because PulseAudio gets depressed
2687          * upon receiving an error from rewind ioctl and stops processing
2688          * any longer.  Returning zero means that no rewind is done, so
2689          * it's not absolutely wrong to answer like that.
2690          */
2691         return ret < 0 ? 0 : frames;
2692 }
2693
2694 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
2695                                         snd_pcm_uframes_t frames)
2696 {
2697         snd_pcm_sframes_t ret;
2698
2699         if (frames == 0)
2700                 return 0;
2701
2702         snd_pcm_stream_lock_irq(substream);
2703         ret = do_pcm_hwsync(substream);
2704         if (!ret)
2705                 ret = rewind_appl_ptr(substream, frames,
2706                                       snd_pcm_hw_avail(substream));
2707         snd_pcm_stream_unlock_irq(substream);
2708         return ret;
2709 }
2710
2711 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
2712                                          snd_pcm_uframes_t frames)
2713 {
2714         snd_pcm_sframes_t ret;
2715
2716         if (frames == 0)
2717                 return 0;
2718
2719         snd_pcm_stream_lock_irq(substream);
2720         ret = do_pcm_hwsync(substream);
2721         if (!ret)
2722                 ret = forward_appl_ptr(substream, frames,
2723                                        snd_pcm_avail(substream));
2724         snd_pcm_stream_unlock_irq(substream);
2725         return ret;
2726 }
2727
2728 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2729 {
2730         int err;
2731
2732         snd_pcm_stream_lock_irq(substream);
2733         err = do_pcm_hwsync(substream);
2734         snd_pcm_stream_unlock_irq(substream);
2735         return err;
2736 }
2737                 
2738 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2739                          snd_pcm_sframes_t *delay)
2740 {
2741         int err;
2742         snd_pcm_sframes_t n = 0;
2743
2744         snd_pcm_stream_lock_irq(substream);
2745         err = do_pcm_hwsync(substream);
2746         if (!err)
2747                 n = snd_pcm_calc_delay(substream);
2748         snd_pcm_stream_unlock_irq(substream);
2749         if (!err)
2750                 *delay = n;
2751         return err;
2752 }
2753                 
2754 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2755                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2756 {
2757         struct snd_pcm_runtime *runtime = substream->runtime;
2758         struct snd_pcm_sync_ptr sync_ptr;
2759         volatile struct snd_pcm_mmap_status *status;
2760         volatile struct snd_pcm_mmap_control *control;
2761         int err;
2762
2763         memset(&sync_ptr, 0, sizeof(sync_ptr));
2764         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2765                 return -EFAULT;
2766         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2767                 return -EFAULT; 
2768         status = runtime->status;
2769         control = runtime->control;
2770         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2771                 err = snd_pcm_hwsync(substream);
2772                 if (err < 0)
2773                         return err;
2774         }
2775         snd_pcm_stream_lock_irq(substream);
2776         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
2777                 err = pcm_lib_apply_appl_ptr(substream,
2778                                              sync_ptr.c.control.appl_ptr);
2779                 if (err < 0) {
2780                         snd_pcm_stream_unlock_irq(substream);
2781                         return err;
2782                 }
2783         } else {
2784                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2785         }
2786         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2787                 control->avail_min = sync_ptr.c.control.avail_min;
2788         else
2789                 sync_ptr.c.control.avail_min = control->avail_min;
2790         sync_ptr.s.status.state = status->state;
2791         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2792         sync_ptr.s.status.tstamp = status->tstamp;
2793         sync_ptr.s.status.suspended_state = status->suspended_state;
2794         sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
2795         snd_pcm_stream_unlock_irq(substream);
2796         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2797                 return -EFAULT;
2798         return 0;
2799 }
2800
2801 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2802 {
2803         struct snd_pcm_runtime *runtime = substream->runtime;
2804         int arg;
2805         
2806         if (get_user(arg, _arg))
2807                 return -EFAULT;
2808         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2809                 return -EINVAL;
2810         runtime->tstamp_type = arg;
2811         return 0;
2812 }
2813
2814 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
2815                                       struct snd_xferi __user *_xferi)
2816 {
2817         struct snd_xferi xferi;
2818         struct snd_pcm_runtime *runtime = substream->runtime;
2819         snd_pcm_sframes_t result;
2820
2821         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2822                 return -EBADFD;
2823         if (put_user(0, &_xferi->result))
2824                 return -EFAULT;
2825         if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2826                 return -EFAULT;
2827         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2828                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2829         else
2830                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2831         __put_user(result, &_xferi->result);
2832         return result < 0 ? result : 0;
2833 }
2834
2835 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
2836                                       struct snd_xfern __user *_xfern)
2837 {
2838         struct snd_xfern xfern;
2839         struct snd_pcm_runtime *runtime = substream->runtime;
2840         void *bufs;
2841         snd_pcm_sframes_t result;
2842
2843         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2844                 return -EBADFD;
2845         if (runtime->channels > 128)
2846                 return -EINVAL;
2847         if (put_user(0, &_xfern->result))
2848                 return -EFAULT;
2849         if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2850                 return -EFAULT;
2851
2852         bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
2853         if (IS_ERR(bufs))
2854                 return PTR_ERR(bufs);
2855         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2856                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2857         else
2858                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2859         kfree(bufs);
2860         __put_user(result, &_xfern->result);
2861         return result < 0 ? result : 0;
2862 }
2863
2864 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
2865                                 snd_pcm_uframes_t __user *_frames)
2866 {
2867         snd_pcm_uframes_t frames;
2868         snd_pcm_sframes_t result;
2869
2870         if (get_user(frames, _frames))
2871                 return -EFAULT;
2872         if (put_user(0, _frames))
2873                 return -EFAULT;
2874         result = snd_pcm_rewind(substream, frames);
2875         __put_user(result, _frames);
2876         return result < 0 ? result : 0;
2877 }
2878
2879 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
2880                                  snd_pcm_uframes_t __user *_frames)
2881 {
2882         snd_pcm_uframes_t frames;
2883         snd_pcm_sframes_t result;
2884
2885         if (get_user(frames, _frames))
2886                 return -EFAULT;
2887         if (put_user(0, _frames))
2888                 return -EFAULT;
2889         result = snd_pcm_forward(substream, frames);
2890         __put_user(result, _frames);
2891         return result < 0 ? result : 0;
2892 }
2893
2894 static int snd_pcm_common_ioctl(struct file *file,
2895                                  struct snd_pcm_substream *substream,
2896                                  unsigned int cmd, void __user *arg)
2897 {
2898         struct snd_pcm_file *pcm_file = file->private_data;
2899         int res;
2900
2901         if (PCM_RUNTIME_CHECK(substream))
2902                 return -ENXIO;
2903
2904         res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0);
2905         if (res < 0)
2906                 return res;
2907
2908         switch (cmd) {
2909         case SNDRV_PCM_IOCTL_PVERSION:
2910                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2911         case SNDRV_PCM_IOCTL_INFO:
2912                 return snd_pcm_info_user(substream, arg);
2913         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2914                 return 0;
2915         case SNDRV_PCM_IOCTL_TTSTAMP:
2916                 return snd_pcm_tstamp(substream, arg);
2917         case SNDRV_PCM_IOCTL_USER_PVERSION:
2918                 if (get_user(pcm_file->user_pversion,
2919                              (unsigned int __user *)arg))
2920                         return -EFAULT;
2921                 return 0;
2922         case SNDRV_PCM_IOCTL_HW_REFINE:
2923                 return snd_pcm_hw_refine_user(substream, arg);
2924         case SNDRV_PCM_IOCTL_HW_PARAMS:
2925                 return snd_pcm_hw_params_user(substream, arg);
2926         case SNDRV_PCM_IOCTL_HW_FREE:
2927                 return snd_pcm_hw_free(substream);
2928         case SNDRV_PCM_IOCTL_SW_PARAMS:
2929                 return snd_pcm_sw_params_user(substream, arg);
2930         case SNDRV_PCM_IOCTL_STATUS:
2931                 return snd_pcm_status_user(substream, arg, false);
2932         case SNDRV_PCM_IOCTL_STATUS_EXT:
2933                 return snd_pcm_status_user(substream, arg, true);
2934         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2935                 return snd_pcm_channel_info_user(substream, arg);
2936         case SNDRV_PCM_IOCTL_PREPARE:
2937                 return snd_pcm_prepare(substream, file);
2938         case SNDRV_PCM_IOCTL_RESET:
2939                 return snd_pcm_reset(substream);
2940         case SNDRV_PCM_IOCTL_START:
2941                 return snd_pcm_start_lock_irq(substream);
2942         case SNDRV_PCM_IOCTL_LINK:
2943                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2944         case SNDRV_PCM_IOCTL_UNLINK:
2945                 return snd_pcm_unlink(substream);
2946         case SNDRV_PCM_IOCTL_RESUME:
2947                 return snd_pcm_resume(substream);
2948         case SNDRV_PCM_IOCTL_XRUN:
2949                 return snd_pcm_xrun(substream);
2950         case SNDRV_PCM_IOCTL_HWSYNC:
2951                 return snd_pcm_hwsync(substream);
2952         case SNDRV_PCM_IOCTL_DELAY:
2953         {
2954                 snd_pcm_sframes_t delay;
2955                 snd_pcm_sframes_t __user *res = arg;
2956                 int err;
2957
2958                 err = snd_pcm_delay(substream, &delay);
2959                 if (err)
2960                         return err;
2961                 if (put_user(delay, res))
2962                         return -EFAULT;
2963                 return 0;
2964         }
2965         case SNDRV_PCM_IOCTL_SYNC_PTR:
2966                 return snd_pcm_sync_ptr(substream, arg);
2967 #ifdef CONFIG_SND_SUPPORT_OLD_API
2968         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2969                 return snd_pcm_hw_refine_old_user(substream, arg);
2970         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2971                 return snd_pcm_hw_params_old_user(substream, arg);
2972 #endif
2973         case SNDRV_PCM_IOCTL_DRAIN:
2974                 return snd_pcm_drain(substream, file);
2975         case SNDRV_PCM_IOCTL_DROP:
2976                 return snd_pcm_drop(substream);
2977         case SNDRV_PCM_IOCTL_PAUSE:
2978                 return snd_pcm_action_lock_irq(&snd_pcm_action_pause,
2979                                                substream,
2980                                                (int)(unsigned long)arg);
2981         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2982         case SNDRV_PCM_IOCTL_READI_FRAMES:
2983                 return snd_pcm_xferi_frames_ioctl(substream, arg);
2984         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2985         case SNDRV_PCM_IOCTL_READN_FRAMES:
2986                 return snd_pcm_xfern_frames_ioctl(substream, arg);
2987         case SNDRV_PCM_IOCTL_REWIND:
2988                 return snd_pcm_rewind_ioctl(substream, arg);
2989         case SNDRV_PCM_IOCTL_FORWARD:
2990                 return snd_pcm_forward_ioctl(substream, arg);
2991         }
2992         pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2993         return -ENOTTY;
2994 }
2995
2996 static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
2997                           unsigned long arg)
2998 {
2999         struct snd_pcm_file *pcm_file;
3000
3001         pcm_file = file->private_data;
3002
3003         if (((cmd >> 8) & 0xff) != 'A')
3004                 return -ENOTTY;
3005
3006         return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
3007                                      (void __user *)arg);
3008 }
3009
3010 /**
3011  * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
3012  * @substream: PCM substream
3013  * @cmd: IOCTL cmd
3014  * @arg: IOCTL argument
3015  *
3016  * The function is provided primarily for OSS layer and USB gadget drivers,
3017  * and it allows only the limited set of ioctls (hw_params, sw_params,
3018  * prepare, start, drain, drop, forward).
3019  */
3020 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3021                          unsigned int cmd, void *arg)
3022 {
3023         snd_pcm_uframes_t *frames = arg;
3024         snd_pcm_sframes_t result;
3025         
3026         switch (cmd) {
3027         case SNDRV_PCM_IOCTL_FORWARD:
3028         {
3029                 /* provided only for OSS; capture-only and no value returned */
3030                 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
3031                         return -EINVAL;
3032                 result = snd_pcm_forward(substream, *frames);
3033                 return result < 0 ? result : 0;
3034         }
3035         case SNDRV_PCM_IOCTL_HW_PARAMS:
3036                 return snd_pcm_hw_params(substream, arg);
3037         case SNDRV_PCM_IOCTL_SW_PARAMS:
3038                 return snd_pcm_sw_params(substream, arg);
3039         case SNDRV_PCM_IOCTL_PREPARE:
3040                 return snd_pcm_prepare(substream, NULL);
3041         case SNDRV_PCM_IOCTL_START:
3042                 return snd_pcm_start_lock_irq(substream);
3043         case SNDRV_PCM_IOCTL_DRAIN:
3044                 return snd_pcm_drain(substream, NULL);
3045         case SNDRV_PCM_IOCTL_DROP:
3046                 return snd_pcm_drop(substream);
3047         case SNDRV_PCM_IOCTL_DELAY:
3048                 return snd_pcm_delay(substream, frames);
3049         default:
3050                 return -EINVAL;
3051         }
3052 }
3053 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3054
3055 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3056                             loff_t * offset)
3057 {
3058         struct snd_pcm_file *pcm_file;
3059         struct snd_pcm_substream *substream;
3060         struct snd_pcm_runtime *runtime;
3061         snd_pcm_sframes_t result;
3062
3063         pcm_file = file->private_data;
3064         substream = pcm_file->substream;
3065         if (PCM_RUNTIME_CHECK(substream))
3066                 return -ENXIO;
3067         runtime = substream->runtime;
3068         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3069                 return -EBADFD;
3070         if (!frame_aligned(runtime, count))
3071                 return -EINVAL;
3072         count = bytes_to_frames(runtime, count);
3073         result = snd_pcm_lib_read(substream, buf, count);
3074         if (result > 0)
3075                 result = frames_to_bytes(runtime, result);
3076         return result;
3077 }
3078
3079 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3080                              size_t count, loff_t * offset)
3081 {
3082         struct snd_pcm_file *pcm_file;
3083         struct snd_pcm_substream *substream;
3084         struct snd_pcm_runtime *runtime;
3085         snd_pcm_sframes_t result;
3086
3087         pcm_file = file->private_data;
3088         substream = pcm_file->substream;
3089         if (PCM_RUNTIME_CHECK(substream))
3090                 return -ENXIO;
3091         runtime = substream->runtime;
3092         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3093                 return -EBADFD;
3094         if (!frame_aligned(runtime, count))
3095                 return -EINVAL;
3096         count = bytes_to_frames(runtime, count);
3097         result = snd_pcm_lib_write(substream, buf, count);
3098         if (result > 0)
3099                 result = frames_to_bytes(runtime, result);
3100         return result;
3101 }
3102
3103 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3104 {
3105         struct snd_pcm_file *pcm_file;
3106         struct snd_pcm_substream *substream;
3107         struct snd_pcm_runtime *runtime;
3108         snd_pcm_sframes_t result;
3109         unsigned long i;
3110         void __user **bufs;
3111         snd_pcm_uframes_t frames;
3112
3113         pcm_file = iocb->ki_filp->private_data;
3114         substream = pcm_file->substream;
3115         if (PCM_RUNTIME_CHECK(substream))
3116                 return -ENXIO;
3117         runtime = substream->runtime;
3118         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3119                 return -EBADFD;
3120         if (!iter_is_iovec(to))
3121                 return -EINVAL;
3122         if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3123                 return -EINVAL;
3124         if (!frame_aligned(runtime, to->iov->iov_len))
3125                 return -EINVAL;
3126         frames = bytes_to_samples(runtime, to->iov->iov_len);
3127         bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL);
3128         if (bufs == NULL)
3129                 return -ENOMEM;
3130         for (i = 0; i < to->nr_segs; ++i)
3131                 bufs[i] = to->iov[i].iov_base;
3132         result = snd_pcm_lib_readv(substream, bufs, frames);
3133         if (result > 0)
3134                 result = frames_to_bytes(runtime, result);
3135         kfree(bufs);
3136         return result;
3137 }
3138
3139 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3140 {
3141         struct snd_pcm_file *pcm_file;
3142         struct snd_pcm_substream *substream;
3143         struct snd_pcm_runtime *runtime;
3144         snd_pcm_sframes_t result;
3145         unsigned long i;
3146         void __user **bufs;
3147         snd_pcm_uframes_t frames;
3148
3149         pcm_file = iocb->ki_filp->private_data;
3150         substream = pcm_file->substream;
3151         if (PCM_RUNTIME_CHECK(substream))
3152                 return -ENXIO;
3153         runtime = substream->runtime;
3154         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3155                 return -EBADFD;
3156         if (!iter_is_iovec(from))
3157                 return -EINVAL;
3158         if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3159             !frame_aligned(runtime, from->iov->iov_len))
3160                 return -EINVAL;
3161         frames = bytes_to_samples(runtime, from->iov->iov_len);
3162         bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL);
3163         if (bufs == NULL)
3164                 return -ENOMEM;
3165         for (i = 0; i < from->nr_segs; ++i)
3166                 bufs[i] = from->iov[i].iov_base;
3167         result = snd_pcm_lib_writev(substream, bufs, frames);
3168         if (result > 0)
3169                 result = frames_to_bytes(runtime, result);
3170         kfree(bufs);
3171         return result;
3172 }
3173
3174 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
3175 {
3176         struct snd_pcm_file *pcm_file;
3177         struct snd_pcm_substream *substream;
3178         struct snd_pcm_runtime *runtime;
3179         __poll_t mask, ok;
3180         snd_pcm_uframes_t avail;
3181
3182         pcm_file = file->private_data;
3183
3184         substream = pcm_file->substream;
3185         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3186                 ok = EPOLLOUT | EPOLLWRNORM;
3187         else
3188                 ok = EPOLLIN | EPOLLRDNORM;
3189         if (PCM_RUNTIME_CHECK(substream))
3190                 return ok | EPOLLERR;
3191
3192         runtime = substream->runtime;
3193         poll_wait(file, &runtime->sleep, wait);
3194
3195         mask = 0;
3196         snd_pcm_stream_lock_irq(substream);
3197         avail = snd_pcm_avail(substream);
3198         switch (runtime->status->state) {
3199         case SNDRV_PCM_STATE_RUNNING:
3200         case SNDRV_PCM_STATE_PREPARED:
3201         case SNDRV_PCM_STATE_PAUSED:
3202                 if (avail >= runtime->control->avail_min)
3203                         mask = ok;
3204                 break;
3205         case SNDRV_PCM_STATE_DRAINING:
3206                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
3207                         mask = ok;
3208                         if (!avail)
3209                                 mask |= EPOLLERR;
3210                 }
3211                 break;
3212         default:
3213                 mask = ok | EPOLLERR;
3214                 break;
3215         }
3216         snd_pcm_stream_unlock_irq(substream);
3217         return mask;
3218 }
3219
3220 /*
3221  * mmap support
3222  */
3223
3224 /*
3225  * Only on coherent architectures, we can mmap the status and the control records
3226  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3227  */
3228 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3229 /*
3230  * mmap status record
3231  */
3232 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3233 {
3234         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3235         struct snd_pcm_runtime *runtime;
3236         
3237         if (substream == NULL)
3238                 return VM_FAULT_SIGBUS;
3239         runtime = substream->runtime;
3240         vmf->page = virt_to_page(runtime->status);
3241         get_page(vmf->page);
3242         return 0;
3243 }
3244
3245 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3246 {
3247         .fault =        snd_pcm_mmap_status_fault,
3248 };
3249
3250 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3251                                struct vm_area_struct *area)
3252 {
3253         long size;
3254         if (!(area->vm_flags & VM_READ))
3255                 return -EINVAL;
3256         size = area->vm_end - area->vm_start;
3257         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3258                 return -EINVAL;
3259         area->vm_ops = &snd_pcm_vm_ops_status;
3260         area->vm_private_data = substream;
3261         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3262         return 0;
3263 }
3264
3265 /*
3266  * mmap control record
3267  */
3268 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3269 {
3270         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3271         struct snd_pcm_runtime *runtime;
3272         
3273         if (substream == NULL)
3274                 return VM_FAULT_SIGBUS;
3275         runtime = substream->runtime;
3276         vmf->page = virt_to_page(runtime->control);
3277         get_page(vmf->page);
3278         return 0;
3279 }
3280
3281 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3282 {
3283         .fault =        snd_pcm_mmap_control_fault,
3284 };
3285
3286 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3287                                 struct vm_area_struct *area)
3288 {
3289         long size;
3290         if (!(area->vm_flags & VM_READ))
3291                 return -EINVAL;
3292         size = area->vm_end - area->vm_start;
3293         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3294                 return -EINVAL;
3295         area->vm_ops = &snd_pcm_vm_ops_control;
3296         area->vm_private_data = substream;
3297         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3298         return 0;
3299 }
3300
3301 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3302 {
3303         if (pcm_file->no_compat_mmap)
3304                 return false;
3305         /* See pcm_control_mmap_allowed() below.
3306          * Since older alsa-lib requires both status and control mmaps to be
3307          * coupled, we have to disable the status mmap for old alsa-lib, too.
3308          */
3309         if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3310             (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3311                 return false;
3312         return true;
3313 }
3314
3315 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3316 {
3317         if (pcm_file->no_compat_mmap)
3318                 return false;
3319         /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3320          * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3321          * thus it effectively assures the manual update of appl_ptr.
3322          */
3323         if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3324                 return false;
3325         return true;
3326 }
3327
3328 #else /* ! coherent mmap */
3329 /*
3330  * don't support mmap for status and control records.
3331  */
3332 #define pcm_status_mmap_allowed(pcm_file)       false
3333 #define pcm_control_mmap_allowed(pcm_file)      false
3334
3335 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3336                                struct vm_area_struct *area)
3337 {
3338         return -ENXIO;
3339 }
3340 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3341                                 struct vm_area_struct *area)
3342 {
3343         return -ENXIO;
3344 }
3345 #endif /* coherent mmap */
3346
3347 static inline struct page *
3348 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3349 {
3350         void *vaddr = substream->runtime->dma_area + ofs;
3351         return virt_to_page(vaddr);
3352 }
3353
3354 /*
3355  * fault callback for mmapping a RAM page
3356  */
3357 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3358 {
3359         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3360         struct snd_pcm_runtime *runtime;
3361         unsigned long offset;
3362         struct page * page;
3363         size_t dma_bytes;
3364         
3365         if (substream == NULL)
3366                 return VM_FAULT_SIGBUS;
3367         runtime = substream->runtime;
3368         offset = vmf->pgoff << PAGE_SHIFT;
3369         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3370         if (offset > dma_bytes - PAGE_SIZE)
3371                 return VM_FAULT_SIGBUS;
3372         if (substream->ops->page)
3373                 page = substream->ops->page(substream, offset);
3374         else
3375                 page = snd_pcm_default_page_ops(substream, offset);
3376         if (!page)
3377                 return VM_FAULT_SIGBUS;
3378         get_page(page);
3379         vmf->page = page;
3380         return 0;
3381 }
3382
3383 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3384         .open =         snd_pcm_mmap_data_open,
3385         .close =        snd_pcm_mmap_data_close,
3386 };
3387
3388 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3389         .open =         snd_pcm_mmap_data_open,
3390         .close =        snd_pcm_mmap_data_close,
3391         .fault =        snd_pcm_mmap_data_fault,
3392 };
3393
3394 /*
3395  * mmap the DMA buffer on RAM
3396  */
3397
3398 /**
3399  * snd_pcm_lib_default_mmap - Default PCM data mmap function
3400  * @substream: PCM substream
3401  * @area: VMA
3402  *
3403  * This is the default mmap handler for PCM data.  When mmap pcm_ops is NULL,
3404  * this function is invoked implicitly.
3405  */
3406 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3407                              struct vm_area_struct *area)
3408 {
3409         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3410 #ifdef CONFIG_GENERIC_ALLOCATOR
3411         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3412                 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3413                 return remap_pfn_range(area, area->vm_start,
3414                                 substream->dma_buffer.addr >> PAGE_SHIFT,
3415                                 area->vm_end - area->vm_start, area->vm_page_prot);
3416         }