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TOMOYO Linux Cross Reference
Linux/sound/core/pcm_native.c

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  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 
 40 #include "pcm_local.h"
 41 
 42 #ifdef CONFIG_SND_DEBUG
 43 #define CREATE_TRACE_POINTS
 44 #include "pcm_param_trace.h"
 45 #else
 46 #define trace_hw_mask_param_enabled()           0
 47 #define trace_hw_interval_param_enabled()       0
 48 #define trace_hw_mask_param(substream, type, index, prev, curr)
 49 #define trace_hw_interval_param(substream, type, index, prev, curr)
 50 #endif
 51 
 52 /*
 53  *  Compatibility
 54  */
 55 
 56 struct snd_pcm_hw_params_old {
 57         unsigned int flags;
 58         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
 59                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
 60         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
 61                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
 62         unsigned int rmask;
 63         unsigned int cmask;
 64         unsigned int info;
 65         unsigned int msbits;
 66         unsigned int rate_num;
 67         unsigned int rate_den;
 68         snd_pcm_uframes_t fifo_size;
 69         unsigned char reserved[64];
 70 };
 71 
 72 #ifdef CONFIG_SND_SUPPORT_OLD_API
 73 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
 74 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
 75 
 76 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
 77                                       struct snd_pcm_hw_params_old __user * _oparams);
 78 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
 79                                       struct snd_pcm_hw_params_old __user * _oparams);
 80 #endif
 81 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
 82 
 83 /*
 84  *
 85  */
 86 
 87 static DEFINE_RWLOCK(snd_pcm_link_rwlock);
 88 static DECLARE_RWSEM(snd_pcm_link_rwsem);
 89 
 90 /* Writer in rwsem may block readers even during its waiting in queue,
 91  * and this may lead to a deadlock when the code path takes read sem
 92  * twice (e.g. one in snd_pcm_action_nonatomic() and another in
 93  * snd_pcm_stream_lock()).  As a (suboptimal) workaround, let writer to
 94  * spin until it gets the lock.
 95  */
 96 static inline void down_write_nonblock(struct rw_semaphore *lock)
 97 {
 98         while (!down_write_trylock(lock))
 99                 cond_resched();
100 }
101 
102 #define PCM_LOCK_DEFAULT        0
103 #define PCM_LOCK_IRQ    1
104 #define PCM_LOCK_IRQSAVE        2
105 
106 static unsigned long __snd_pcm_stream_lock_mode(struct snd_pcm_substream *substream,
107                                                 unsigned int mode)
108 {
109         unsigned long flags = 0;
110         if (substream->pcm->nonatomic) {
111                 down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING);
112                 mutex_lock(&substream->self_group.mutex);
113         } else {
114                 switch (mode) {
115                 case PCM_LOCK_DEFAULT:
116                         read_lock(&snd_pcm_link_rwlock);
117                         break;
118                 case PCM_LOCK_IRQ:
119                         read_lock_irq(&snd_pcm_link_rwlock);
120                         break;
121                 case PCM_LOCK_IRQSAVE:
122                         read_lock_irqsave(&snd_pcm_link_rwlock, flags);
123                         break;
124                 }
125                 spin_lock(&substream->self_group.lock);
126         }
127         return flags;
128 }
129 
130 static void __snd_pcm_stream_unlock_mode(struct snd_pcm_substream *substream,
131                                          unsigned int mode, unsigned long flags)
132 {
133         if (substream->pcm->nonatomic) {
134                 mutex_unlock(&substream->self_group.mutex);
135                 up_read(&snd_pcm_link_rwsem);
136         } else {
137                 spin_unlock(&substream->self_group.lock);
138 
139                 switch (mode) {
140                 case PCM_LOCK_DEFAULT:
141                         read_unlock(&snd_pcm_link_rwlock);
142                         break;
143                 case PCM_LOCK_IRQ:
144                         read_unlock_irq(&snd_pcm_link_rwlock);
145                         break;
146                 case PCM_LOCK_IRQSAVE:
147                         read_unlock_irqrestore(&snd_pcm_link_rwlock, flags);
148                         break;
149                 }
150         }
151 }
152 
153 /**
154  * snd_pcm_stream_lock - Lock the PCM stream
155  * @substream: PCM substream
156  *
157  * This locks the PCM stream's spinlock or mutex depending on the nonatomic
158  * flag of the given substream.  This also takes the global link rw lock
159  * (or rw sem), too, for avoiding the race with linked streams.
160  */
161 void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
162 {
163         __snd_pcm_stream_lock_mode(substream, PCM_LOCK_DEFAULT);
164 }
165 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
166 
167 /**
168  * snd_pcm_stream_lock - Unlock the PCM stream
169  * @substream: PCM substream
170  *
171  * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
172  */
173 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
174 {
175         __snd_pcm_stream_unlock_mode(substream, PCM_LOCK_DEFAULT, 0);
176 }
177 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
178 
179 /**
180  * snd_pcm_stream_lock_irq - Lock the PCM stream
181  * @substream: PCM substream
182  *
183  * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
184  * IRQ (only when nonatomic is false).  In nonatomic case, this is identical
185  * as snd_pcm_stream_lock().
186  */
187 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
188 {
189         __snd_pcm_stream_lock_mode(substream, PCM_LOCK_IRQ);
190 }
191 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
192 
193 /**
194  * snd_pcm_stream_unlock_irq - Unlock the PCM stream
195  * @substream: PCM substream
196  *
197  * This is a counter-part of snd_pcm_stream_lock_irq().
198  */
199 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
200 {
201         __snd_pcm_stream_unlock_mode(substream, PCM_LOCK_IRQ, 0);
202 }
203 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
204 
205 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
206 {
207         return __snd_pcm_stream_lock_mode(substream, PCM_LOCK_IRQSAVE);
208 }
209 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
210 
211 /**
212  * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
213  * @substream: PCM substream
214  * @flags: irq flags
215  *
216  * This is a counter-part of snd_pcm_stream_lock_irqsave().
217  */
218 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
219                                       unsigned long flags)
220 {
221         __snd_pcm_stream_unlock_mode(substream, PCM_LOCK_IRQSAVE, flags);
222 }
223 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
224 
225 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
226 {
227         struct snd_pcm *pcm = substream->pcm;
228         struct snd_pcm_str *pstr = substream->pstr;
229 
230         memset(info, 0, sizeof(*info));
231         info->card = pcm->card->number;
232         info->device = pcm->device;
233         info->stream = substream->stream;
234         info->subdevice = substream->number;
235         strlcpy(info->id, pcm->id, sizeof(info->id));
236         strlcpy(info->name, pcm->name, sizeof(info->name));
237         info->dev_class = pcm->dev_class;
238         info->dev_subclass = pcm->dev_subclass;
239         info->subdevices_count = pstr->substream_count;
240         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
241         strlcpy(info->subname, substream->name, sizeof(info->subname));
242 
243         return 0;
244 }
245 
246 int snd_pcm_info_user(struct snd_pcm_substream *substream,
247                       struct snd_pcm_info __user * _info)
248 {
249         struct snd_pcm_info *info;
250         int err;
251 
252         info = kmalloc(sizeof(*info), GFP_KERNEL);
253         if (! info)
254                 return -ENOMEM;
255         err = snd_pcm_info(substream, info);
256         if (err >= 0) {
257                 if (copy_to_user(_info, info, sizeof(*info)))
258                         err = -EFAULT;
259         }
260         kfree(info);
261         return err;
262 }
263 
264 static bool hw_support_mmap(struct snd_pcm_substream *substream)
265 {
266         if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
267                 return false;
268         /* architecture supports dma_mmap_coherent()? */
269 #if defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) || !defined(CONFIG_HAS_DMA)
270         if (!substream->ops->mmap &&
271             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
272                 return false;
273 #endif
274         return true;
275 }
276 
277 static int constrain_mask_params(struct snd_pcm_substream *substream,
278                                  struct snd_pcm_hw_params *params)
279 {
280         struct snd_pcm_hw_constraints *constrs =
281                                         &substream->runtime->hw_constraints;
282         struct snd_mask *m;
283         unsigned int k;
284         struct snd_mask old_mask;
285         int changed;
286 
287         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
288                 m = hw_param_mask(params, k);
289                 if (snd_mask_empty(m))
290                         return -EINVAL;
291 
292                 /* This parameter is not requested to change by a caller. */
293                 if (!(params->rmask & (1 << k)))
294                         continue;
295 
296                 if (trace_hw_mask_param_enabled())
297                         old_mask = *m;
298 
299                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
300                 if (changed < 0)
301                         return changed;
302                 if (changed == 0)
303                         continue;
304 
305                 /* Set corresponding flag so that the caller gets it. */
306                 trace_hw_mask_param(substream, k, 0, &old_mask, m);
307                 params->cmask |= 1 << k;
308         }
309 
310         return 0;
311 }
312 
313 static int constrain_interval_params(struct snd_pcm_substream *substream,
314                                      struct snd_pcm_hw_params *params)
315 {
316         struct snd_pcm_hw_constraints *constrs =
317                                         &substream->runtime->hw_constraints;
318         struct snd_interval *i;
319         unsigned int k;
320         struct snd_interval old_interval;
321         int changed;
322 
323         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
324                 i = hw_param_interval(params, k);
325                 if (snd_interval_empty(i))
326                         return -EINVAL;
327 
328                 /* This parameter is not requested to change by a caller. */
329                 if (!(params->rmask & (1 << k)))
330                         continue;
331 
332                 if (trace_hw_interval_param_enabled())
333                         old_interval = *i;
334 
335                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
336                 if (changed < 0)
337                         return changed;
338                 if (changed == 0)
339                         continue;
340 
341                 /* Set corresponding flag so that the caller gets it. */
342                 trace_hw_interval_param(substream, k, 0, &old_interval, i);
343                 params->cmask |= 1 << k;
344         }
345 
346         return 0;
347 }
348 
349 static int constrain_params_by_rules(struct snd_pcm_substream *substream,
350                                      struct snd_pcm_hw_params *params)
351 {
352         struct snd_pcm_hw_constraints *constrs =
353                                         &substream->runtime->hw_constraints;
354         unsigned int k;
355         unsigned int *rstamps;
356         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
357         unsigned int stamp;
358         struct snd_pcm_hw_rule *r;
359         unsigned int d;
360         struct snd_mask old_mask;
361         struct snd_interval old_interval;
362         bool again;
363         int changed, err = 0;
364 
365         /*
366          * Each application of rule has own sequence number.
367          *
368          * Each member of 'rstamps' array represents the sequence number of
369          * recent application of corresponding rule.
370          */
371         rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
372         if (!rstamps)
373                 return -ENOMEM;
374 
375         /*
376          * Each member of 'vstamps' array represents the sequence number of
377          * recent application of rule in which corresponding parameters were
378          * changed.
379          *
380          * In initial state, elements corresponding to parameters requested by
381          * a caller is 1. For unrequested parameters, corresponding members
382          * have 0 so that the parameters are never changed anymore.
383          */
384         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
385                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
386 
387         /* Due to the above design, actual sequence number starts at 2. */
388         stamp = 2;
389 retry:
390         /* Apply all rules in order. */
391         again = false;
392         for (k = 0; k < constrs->rules_num; k++) {
393                 r = &constrs->rules[k];
394 
395                 /*
396                  * Check condition bits of this rule. When the rule has
397                  * some condition bits, parameter without the bits is
398                  * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
399                  * is an example of the condition bits.
400                  */
401                 if (r->cond && !(r->cond & params->flags))
402                         continue;
403 
404                 /*
405                  * The 'deps' array includes maximum three dependencies
406                  * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth
407                  * member of this array is a sentinel and should be
408                  * negative value.
409                  *
410                  * This rule should be processed in this time when dependent
411                  * parameters were changed at former applications of the other
412                  * rules.
413                  */
414                 for (d = 0; r->deps[d] >= 0; d++) {
415                         if (vstamps[r->deps[d]] > rstamps[k])
416                                 break;
417                 }
418                 if (r->deps[d] < 0)
419                         continue;
420 
421                 if (trace_hw_mask_param_enabled()) {
422                         if (hw_is_mask(r->var))
423                                 old_mask = *hw_param_mask(params, r->var);
424                 }
425                 if (trace_hw_interval_param_enabled()) {
426                         if (hw_is_interval(r->var))
427                                 old_interval = *hw_param_interval(params, r->var);
428                 }
429 
430                 changed = r->func(params, r);
431                 if (changed < 0) {
432                         err = changed;
433                         goto out;
434                 }
435 
436                 /*
437                  * When the parameter is changed, notify it to the caller
438                  * by corresponding returned bit, then preparing for next
439                  * iteration.
440                  */
441                 if (changed && r->var >= 0) {
442                         if (hw_is_mask(r->var)) {
443                                 trace_hw_mask_param(substream, r->var,
444                                         k + 1, &old_mask,
445                                         hw_param_mask(params, r->var));
446                         }
447                         if (hw_is_interval(r->var)) {
448                                 trace_hw_interval_param(substream, r->var,
449                                         k + 1, &old_interval,
450                                         hw_param_interval(params, r->var));
451                         }
452 
453                         params->cmask |= (1 << r->var);
454                         vstamps[r->var] = stamp;
455                         again = true;
456                 }
457 
458                 rstamps[k] = stamp++;
459         }
460 
461         /* Iterate to evaluate all rules till no parameters are changed. */
462         if (again)
463                 goto retry;
464 
465  out:
466         kfree(rstamps);
467         return err;
468 }
469 
470 static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
471                                      struct snd_pcm_hw_params *params)
472 {
473         const struct snd_interval *i;
474         const struct snd_mask *m;
475         int err;
476 
477         if (!params->msbits) {
478                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
479                 if (snd_interval_single(i))
480                         params->msbits = snd_interval_value(i);
481         }
482 
483         if (!params->rate_den) {
484                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
485                 if (snd_interval_single(i)) {
486                         params->rate_num = snd_interval_value(i);
487                         params->rate_den = 1;
488                 }
489         }
490 
491         if (!params->fifo_size) {
492                 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
493                 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
494                 if (snd_mask_single(m) && snd_interval_single(i)) {
495                         err = substream->ops->ioctl(substream,
496                                         SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
497                         if (err < 0)
498                                 return err;
499                 }
500         }
501 
502         if (!params->info) {
503                 params->info = substream->runtime->hw.info;
504                 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
505                                   SNDRV_PCM_INFO_DRAIN_TRIGGER);
506                 if (!hw_support_mmap(substream))
507                         params->info &= ~(SNDRV_PCM_INFO_MMAP |
508                                           SNDRV_PCM_INFO_MMAP_VALID);
509         }
510 
511         return 0;
512 }
513 
514 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
515                       struct snd_pcm_hw_params *params)
516 {
517         int err;
518 
519         params->info = 0;
520         params->fifo_size = 0;
521         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
522                 params->msbits = 0;
523         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
524                 params->rate_num = 0;
525                 params->rate_den = 0;
526         }
527 
528         err = constrain_mask_params(substream, params);
529         if (err < 0)
530                 return err;
531 
532         err = constrain_interval_params(substream, params);
533         if (err < 0)
534                 return err;
535 
536         err = constrain_params_by_rules(substream, params);
537         if (err < 0)
538                 return err;
539 
540         params->rmask = 0;
541 
542         return 0;
543 }
544 EXPORT_SYMBOL(snd_pcm_hw_refine);
545 
546 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
547                                   struct snd_pcm_hw_params __user * _params)
548 {
549         struct snd_pcm_hw_params *params;
550         int err;
551 
552         params = memdup_user(_params, sizeof(*params));
553         if (IS_ERR(params))
554                 return PTR_ERR(params);
555 
556         err = snd_pcm_hw_refine(substream, params);
557         if (err < 0)
558                 goto end;
559 
560         err = fixup_unreferenced_params(substream, params);
561         if (err < 0)
562                 goto end;
563 
564         if (copy_to_user(_params, params, sizeof(*params)))
565                 err = -EFAULT;
566 end:
567         kfree(params);
568         return err;
569 }
570 
571 static int period_to_usecs(struct snd_pcm_runtime *runtime)
572 {
573         int usecs;
574 
575         if (! runtime->rate)
576                 return -1; /* invalid */
577 
578         /* take 75% of period time as the deadline */
579         usecs = (750000 / runtime->rate) * runtime->period_size;
580         usecs += ((750000 % runtime->rate) * runtime->period_size) /
581                 runtime->rate;
582 
583         return usecs;
584 }
585 
586 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
587 {
588         snd_pcm_stream_lock_irq(substream);
589         if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
590                 substream->runtime->status->state = state;
591         snd_pcm_stream_unlock_irq(substream);
592 }
593 
594 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
595                                         int event)
596 {
597 #ifdef CONFIG_SND_PCM_TIMER
598         if (substream->timer)
599                 snd_timer_notify(substream->timer, event,
600                                         &substream->runtime->trigger_tstamp);
601 #endif
602 }
603 
604 /**
605  * snd_pcm_hw_param_choose - choose a configuration defined by @params
606  * @pcm: PCM instance
607  * @params: the hw_params instance
608  *
609  * Choose one configuration from configuration space defined by @params.
610  * The configuration chosen is that obtained fixing in this order:
611  * first access, first format, first subformat, min channels,
612  * min rate, min period time, max buffer size, min tick time
613  *
614  * Return: Zero if successful, or a negative error code on failure.
615  */
616 static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
617                                     struct snd_pcm_hw_params *params)
618 {
619         static const int vars[] = {
620                 SNDRV_PCM_HW_PARAM_ACCESS,
621                 SNDRV_PCM_HW_PARAM_FORMAT,
622                 SNDRV_PCM_HW_PARAM_SUBFORMAT,
623                 SNDRV_PCM_HW_PARAM_CHANNELS,
624                 SNDRV_PCM_HW_PARAM_RATE,
625                 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
626                 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
627                 SNDRV_PCM_HW_PARAM_TICK_TIME,
628                 -1
629         };
630         const int *v;
631         struct snd_mask old_mask;
632         struct snd_interval old_interval;
633         int changed;
634 
635         for (v = vars; *v != -1; v++) {
636                 /* Keep old parameter to trace. */
637                 if (trace_hw_mask_param_enabled()) {
638                         if (hw_is_mask(*v))
639                                 old_mask = *hw_param_mask(params, *v);
640                 }
641                 if (trace_hw_interval_param_enabled()) {
642                         if (hw_is_interval(*v))
643                                 old_interval = *hw_param_interval(params, *v);
644                 }
645                 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
646                         changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
647                 else
648                         changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
649                 if (changed < 0)
650                         return changed;
651                 if (changed == 0)
652                         continue;
653 
654                 /* Trace the changed parameter. */
655                 if (hw_is_mask(*v)) {
656                         trace_hw_mask_param(pcm, *v, 0, &old_mask,
657                                             hw_param_mask(params, *v));
658                 }
659                 if (hw_is_interval(*v)) {
660                         trace_hw_interval_param(pcm, *v, 0, &old_interval,
661                                                 hw_param_interval(params, *v));
662                 }
663         }
664 
665         return 0;
666 }
667 
668 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
669                              struct snd_pcm_hw_params *params)
670 {
671         struct snd_pcm_runtime *runtime;
672         int err, usecs;
673         unsigned int bits;
674         snd_pcm_uframes_t frames;
675 
676         if (PCM_RUNTIME_CHECK(substream))
677                 return -ENXIO;
678         runtime = substream->runtime;
679         snd_pcm_stream_lock_irq(substream);
680         switch (runtime->status->state) {
681         case SNDRV_PCM_STATE_OPEN:
682         case SNDRV_PCM_STATE_SETUP:
683         case SNDRV_PCM_STATE_PREPARED:
684                 break;
685         default:
686                 snd_pcm_stream_unlock_irq(substream);
687                 return -EBADFD;
688         }
689         snd_pcm_stream_unlock_irq(substream);
690 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
691         if (!substream->oss.oss)
692 #endif
693                 if (atomic_read(&substream->mmap_count))
694                         return -EBADFD;
695 
696         params->rmask = ~0U;
697         err = snd_pcm_hw_refine(substream, params);
698         if (err < 0)
699                 goto _error;
700 
701         err = snd_pcm_hw_params_choose(substream, params);
702         if (err < 0)
703                 goto _error;
704 
705         err = fixup_unreferenced_params(substream, params);
706         if (err < 0)
707                 goto _error;
708 
709         if (substream->ops->hw_params != NULL) {
710                 err = substream->ops->hw_params(substream, params);
711                 if (err < 0)
712                         goto _error;
713         }
714 
715         runtime->access = params_access(params);
716         runtime->format = params_format(params);
717         runtime->subformat = params_subformat(params);
718         runtime->channels = params_channels(params);
719         runtime->rate = params_rate(params);
720         runtime->period_size = params_period_size(params);
721         runtime->periods = params_periods(params);
722         runtime->buffer_size = params_buffer_size(params);
723         runtime->info = params->info;
724         runtime->rate_num = params->rate_num;
725         runtime->rate_den = params->rate_den;
726         runtime->no_period_wakeup =
727                         (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
728                         (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
729 
730         bits = snd_pcm_format_physical_width(runtime->format);
731         runtime->sample_bits = bits;
732         bits *= runtime->channels;
733         runtime->frame_bits = bits;
734         frames = 1;
735         while (bits % 8 != 0) {
736                 bits *= 2;
737                 frames *= 2;
738         }
739         runtime->byte_align = bits / 8;
740         runtime->min_align = frames;
741 
742         /* Default sw params */
743         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
744         runtime->period_step = 1;
745         runtime->control->avail_min = runtime->period_size;
746         runtime->start_threshold = 1;
747         runtime->stop_threshold = runtime->buffer_size;
748         runtime->silence_threshold = 0;
749         runtime->silence_size = 0;
750         runtime->boundary = runtime->buffer_size;
751         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
752                 runtime->boundary *= 2;
753 
754         snd_pcm_timer_resolution_change(substream);
755         snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
756 
757         if (pm_qos_request_active(&substream->latency_pm_qos_req))
758                 pm_qos_remove_request(&substream->latency_pm_qos_req);
759         if ((usecs = period_to_usecs(runtime)) >= 0)
760                 pm_qos_add_request(&substream->latency_pm_qos_req,
761                                    PM_QOS_CPU_DMA_LATENCY, usecs);
762         return 0;
763  _error:
764         /* hardware might be unusable from this time,
765            so we force application to retry to set
766            the correct hardware parameter settings */
767         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
768         if (substream->ops->hw_free != NULL)
769                 substream->ops->hw_free(substream);
770         return err;
771 }
772 
773 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
774                                   struct snd_pcm_hw_params __user * _params)
775 {
776         struct snd_pcm_hw_params *params;
777         int err;
778 
779         params = memdup_user(_params, sizeof(*params));
780         if (IS_ERR(params))
781                 return PTR_ERR(params);
782 
783         err = snd_pcm_hw_params(substream, params);
784         if (err < 0)
785                 goto end;
786 
787         if (copy_to_user(_params, params, sizeof(*params)))
788                 err = -EFAULT;
789 end:
790         kfree(params);
791         return err;
792 }
793 
794 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
795 {
796         struct snd_pcm_runtime *runtime;
797         int result = 0;
798 
799         if (PCM_RUNTIME_CHECK(substream))
800                 return -ENXIO;
801         runtime = substream->runtime;
802         snd_pcm_stream_lock_irq(substream);
803         switch (runtime->status->state) {
804         case SNDRV_PCM_STATE_SETUP:
805         case SNDRV_PCM_STATE_PREPARED:
806                 break;
807         default:
808                 snd_pcm_stream_unlock_irq(substream);
809                 return -EBADFD;
810         }
811         snd_pcm_stream_unlock_irq(substream);
812         if (atomic_read(&substream->mmap_count))
813                 return -EBADFD;
814         if (substream->ops->hw_free)
815                 result = substream->ops->hw_free(substream);
816         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
817         pm_qos_remove_request(&substream->latency_pm_qos_req);
818         return result;
819 }
820 
821 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
822                              struct snd_pcm_sw_params *params)
823 {
824         struct snd_pcm_runtime *runtime;
825         int err;
826 
827         if (PCM_RUNTIME_CHECK(substream))
828                 return -ENXIO;
829         runtime = substream->runtime;
830         snd_pcm_stream_lock_irq(substream);
831         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
832                 snd_pcm_stream_unlock_irq(substream);
833                 return -EBADFD;
834         }
835         snd_pcm_stream_unlock_irq(substream);
836 
837         if (params->tstamp_mode < 0 ||
838             params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
839                 return -EINVAL;
840         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
841             params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
842                 return -EINVAL;
843         if (params->avail_min == 0)
844                 return -EINVAL;
845         if (params->silence_size >= runtime->boundary) {
846                 if (params->silence_threshold != 0)
847                         return -EINVAL;
848         } else {
849                 if (params->silence_size > params->silence_threshold)
850                         return -EINVAL;
851                 if (params->silence_threshold > runtime->buffer_size)
852                         return -EINVAL;
853         }
854         err = 0;
855         snd_pcm_stream_lock_irq(substream);
856         runtime->tstamp_mode = params->tstamp_mode;
857         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
858                 runtime->tstamp_type = params->tstamp_type;
859         runtime->period_step = params->period_step;
860         runtime->control->avail_min = params->avail_min;
861         runtime->start_threshold = params->start_threshold;
862         runtime->stop_threshold = params->stop_threshold;
863         runtime->silence_threshold = params->silence_threshold;
864         runtime->silence_size = params->silence_size;
865         params->boundary = runtime->boundary;
866         if (snd_pcm_running(substream)) {
867                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
868                     runtime->silence_size > 0)
869                         snd_pcm_playback_silence(substream, ULONG_MAX);
870                 err = snd_pcm_update_state(substream, runtime);
871         }
872         snd_pcm_stream_unlock_irq(substream);
873         return err;
874 }
875 
876 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
877                                   struct snd_pcm_sw_params __user * _params)
878 {
879         struct snd_pcm_sw_params params;
880         int err;
881         if (copy_from_user(&params, _params, sizeof(params)))
882                 return -EFAULT;
883         err = snd_pcm_sw_params(substream, &params);
884         if (copy_to_user(_params, &params, sizeof(params)))
885                 return -EFAULT;
886         return err;
887 }
888 
889 static inline snd_pcm_uframes_t
890 snd_pcm_calc_delay(struct snd_pcm_substream *substream)
891 {
892         snd_pcm_uframes_t delay;
893 
894         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
895                 delay = snd_pcm_playback_hw_avail(substream->runtime);
896         else
897                 delay = snd_pcm_capture_avail(substream->runtime);
898         return delay + substream->runtime->delay;
899 }
900 
901 int snd_pcm_status(struct snd_pcm_substream *substream,
902                    struct snd_pcm_status *status)
903 {
904         struct snd_pcm_runtime *runtime = substream->runtime;
905 
906         snd_pcm_stream_lock_irq(substream);
907 
908         snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
909                                         &runtime->audio_tstamp_config);
910 
911         /* backwards compatible behavior */
912         if (runtime->audio_tstamp_config.type_requested ==
913                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
914                 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
915                         runtime->audio_tstamp_config.type_requested =
916                                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
917                 else
918                         runtime->audio_tstamp_config.type_requested =
919                                 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
920                 runtime->audio_tstamp_report.valid = 0;
921         } else
922                 runtime->audio_tstamp_report.valid = 1;
923 
924         status->state = runtime->status->state;
925         status->suspended_state = runtime->status->suspended_state;
926         if (status->state == SNDRV_PCM_STATE_OPEN)
927                 goto _end;
928         status->trigger_tstamp = runtime->trigger_tstamp;
929         if (snd_pcm_running(substream)) {
930                 snd_pcm_update_hw_ptr(substream);
931                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
932                         status->tstamp = runtime->status->tstamp;
933                         status->driver_tstamp = runtime->driver_tstamp;
934                         status->audio_tstamp =
935                                 runtime->status->audio_tstamp;
936                         if (runtime->audio_tstamp_report.valid == 1)
937                                 /* backwards compatibility, no report provided in COMPAT mode */
938                                 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
939                                                                 &status->audio_tstamp_accuracy,
940                                                                 &runtime->audio_tstamp_report);
941 
942                         goto _tstamp_end;
943                 }
944         } else {
945                 /* get tstamp only in fallback mode and only if enabled */
946                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
947                         snd_pcm_gettime(runtime, &status->tstamp);
948         }
949  _tstamp_end:
950         status->appl_ptr = runtime->control->appl_ptr;
951         status->hw_ptr = runtime->status->hw_ptr;
952         status->avail = snd_pcm_avail(substream);
953         status->delay = snd_pcm_running(substream) ?
954                 snd_pcm_calc_delay(substream) : 0;
955         status->avail_max = runtime->avail_max;
956         status->overrange = runtime->overrange;
957         runtime->avail_max = 0;
958         runtime->overrange = 0;
959  _end:
960         snd_pcm_stream_unlock_irq(substream);
961         return 0;
962 }
963 
964 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
965                                struct snd_pcm_status __user * _status,
966                                bool ext)
967 {
968         struct snd_pcm_status status;
969         int res;
970 
971         memset(&status, 0, sizeof(status));
972         /*
973          * with extension, parameters are read/write,
974          * get audio_tstamp_data from user,
975          * ignore rest of status structure
976          */
977         if (ext && get_user(status.audio_tstamp_data,
978                                 (u32 __user *)(&_status->audio_tstamp_data)))
979                 return -EFAULT;
980         res = snd_pcm_status(substream, &status);
981         if (res < 0)
982                 return res;
983         if (copy_to_user(_status, &status, sizeof(status)))
984                 return -EFAULT;
985         return 0;
986 }
987 
988 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
989                                 struct snd_pcm_channel_info * info)
990 {
991         struct snd_pcm_runtime *runtime;
992         unsigned int channel;
993         
994         channel = info->channel;
995         runtime = substream->runtime;
996         snd_pcm_stream_lock_irq(substream);
997         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
998                 snd_pcm_stream_unlock_irq(substream);
999                 return -EBADFD;
1000         }
1001         snd_pcm_stream_unlock_irq(substream);
1002         if (channel >= runtime->channels)
1003                 return -EINVAL;
1004         memset(info, 0, sizeof(*info));
1005         info->channel = channel;
1006         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
1007 }
1008 
1009 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
1010                                      struct snd_pcm_channel_info __user * _info)
1011 {
1012         struct snd_pcm_channel_info info;
1013         int res;
1014         
1015         if (copy_from_user(&info, _info, sizeof(info)))
1016                 return -EFAULT;
1017         res = snd_pcm_channel_info(substream, &info);
1018         if (res < 0)
1019                 return res;
1020         if (copy_to_user(_info, &info, sizeof(info)))
1021                 return -EFAULT;
1022         return 0;
1023 }
1024 
1025 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
1026 {
1027         struct snd_pcm_runtime *runtime = substream->runtime;
1028         if (runtime->trigger_master == NULL)
1029                 return;
1030         if (runtime->trigger_master == substream) {
1031                 if (!runtime->trigger_tstamp_latched)
1032                         snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1033         } else {
1034                 snd_pcm_trigger_tstamp(runtime->trigger_master);
1035                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
1036         }
1037         runtime->trigger_master = NULL;
1038 }
1039 
1040 struct action_ops {
1041         int (*pre_action)(struct snd_pcm_substream *substream, int state);
1042         int (*do_action)(struct snd_pcm_substream *substream, int state);
1043         void (*undo_action)(struct snd_pcm_substream *substream, int state);
1044         void (*post_action)(struct snd_pcm_substream *substream, int state);
1045 };
1046 
1047 /*
1048  *  this functions is core for handling of linked stream
1049  *  Note: the stream state might be changed also on failure
1050  *  Note2: call with calling stream lock + link lock
1051  */
1052 static int snd_pcm_action_group(const struct action_ops *ops,
1053                                 struct snd_pcm_substream *substream,
1054                                 int state, int do_lock)
1055 {
1056         struct snd_pcm_substream *s = NULL;
1057         struct snd_pcm_substream *s1;
1058         int res = 0, depth = 1;
1059 
1060         snd_pcm_group_for_each_entry(s, substream) {
1061                 if (do_lock && s != substream) {
1062                         if (s->pcm->nonatomic)
1063                                 mutex_lock_nested(&s->self_group.mutex, depth);
1064                         else
1065                                 spin_lock_nested(&s->self_group.lock, depth);
1066                         depth++;
1067                 }
1068                 res = ops->pre_action(s, state);
1069                 if (res < 0)
1070                         goto _unlock;
1071         }
1072         snd_pcm_group_for_each_entry(s, substream) {
1073                 res = ops->do_action(s, state);
1074                 if (res < 0) {
1075                         if (ops->undo_action) {
1076                                 snd_pcm_group_for_each_entry(s1, substream) {
1077                                         if (s1 == s) /* failed stream */
1078                                                 break;
1079                                         ops->undo_action(s1, state);
1080                                 }
1081                         }
1082                         s = NULL; /* unlock all */
1083                         goto _unlock;
1084                 }
1085         }
1086         snd_pcm_group_for_each_entry(s, substream) {
1087                 ops->post_action(s, state);
1088         }
1089  _unlock:
1090         if (do_lock) {
1091                 /* unlock streams */
1092                 snd_pcm_group_for_each_entry(s1, substream) {
1093                         if (s1 != substream) {
1094                                 if (s1->pcm->nonatomic)
1095                                         mutex_unlock(&s1->self_group.mutex);
1096                                 else
1097                                         spin_unlock(&s1->self_group.lock);
1098                         }
1099                         if (s1 == s)    /* end */
1100                                 break;
1101                 }
1102         }
1103         return res;
1104 }
1105 
1106 /*
1107  *  Note: call with stream lock
1108  */
1109 static int snd_pcm_action_single(const struct action_ops *ops,
1110                                  struct snd_pcm_substream *substream,
1111                                  int state)
1112 {
1113         int res;
1114         
1115         res = ops->pre_action(substream, state);
1116         if (res < 0)
1117                 return res;
1118         res = ops->do_action(substream, state);
1119         if (res == 0)
1120                 ops->post_action(substream, state);
1121         else if (ops->undo_action)
1122                 ops->undo_action(substream, state);
1123         return res;
1124 }
1125 
1126 /*
1127  *  Note: call with stream lock
1128  */
1129 static int snd_pcm_action(const struct action_ops *ops,
1130                           struct snd_pcm_substream *substream,
1131                           int state)
1132 {
1133         int res;
1134 
1135         if (!snd_pcm_stream_linked(substream))
1136                 return snd_pcm_action_single(ops, substream, state);
1137 
1138         if (substream->pcm->nonatomic) {
1139                 if (!mutex_trylock(&substream->group->mutex)) {
1140                         mutex_unlock(&substream->self_group.mutex);
1141                         mutex_lock(&substream->group->mutex);
1142                         mutex_lock(&substream->self_group.mutex);
1143                 }
1144                 res = snd_pcm_action_group(ops, substream, state, 1);
1145                 mutex_unlock(&substream->group->mutex);
1146         } else {
1147                 if (!spin_trylock(&substream->group->lock)) {
1148                         spin_unlock(&substream->self_group.lock);
1149                         spin_lock(&substream->group->lock);
1150                         spin_lock(&substream->self_group.lock);
1151                 }
1152                 res = snd_pcm_action_group(ops, substream, state, 1);
1153                 spin_unlock(&substream->group->lock);
1154         }
1155         return res;
1156 }
1157 
1158 /*
1159  *  Note: don't use any locks before
1160  */
1161 static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1162                                    struct snd_pcm_substream *substream,
1163                                    int state)
1164 {
1165         int res;
1166 
1167         snd_pcm_stream_lock_irq(substream);
1168         res = snd_pcm_action(ops, substream, state);
1169         snd_pcm_stream_unlock_irq(substream);
1170         return res;
1171 }
1172 
1173 /*
1174  */
1175 static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1176                                     struct snd_pcm_substream *substream,
1177                                     int state)
1178 {
1179         int res;
1180 
1181         down_read(&snd_pcm_link_rwsem);
1182         if (snd_pcm_stream_linked(substream))
1183                 res = snd_pcm_action_group(ops, substream, state, 0);
1184         else
1185                 res = snd_pcm_action_single(ops, substream, state);
1186         up_read(&snd_pcm_link_rwsem);
1187         return res;
1188 }
1189 
1190 /*
1191  * start callbacks
1192  */
1193 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
1194 {
1195         struct snd_pcm_runtime *runtime = substream->runtime;
1196         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
1197                 return -EBADFD;
1198         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1199             !snd_pcm_playback_data(substream))
1200                 return -EPIPE;
1201         runtime->trigger_tstamp_latched = false;
1202         runtime->trigger_master = substream;
1203         return 0;
1204 }
1205 
1206 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
1207 {
1208         if (substream->runtime->trigger_master != substream)
1209                 return 0;
1210         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1211 }
1212 
1213 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
1214 {
1215         if (substream->runtime->trigger_master == substream)
1216                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1217 }
1218 
1219 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
1220 {
1221         struct snd_pcm_runtime *runtime = substream->runtime;
1222         snd_pcm_trigger_tstamp(substream);
1223         runtime->hw_ptr_jiffies = jiffies;
1224         runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 
1225                                                             runtime->rate;
1226         runtime->status->state = state;
1227         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1228             runtime->silence_size > 0)
1229                 snd_pcm_playback_silence(substream, ULONG_MAX);
1230         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1231 }
1232 
1233 static const struct action_ops snd_pcm_action_start = {
1234         .pre_action = snd_pcm_pre_start,
1235         .do_action = snd_pcm_do_start,
1236         .undo_action = snd_pcm_undo_start,
1237         .post_action = snd_pcm_post_start
1238 };
1239 
1240 /**
1241  * snd_pcm_start - start all linked streams
1242  * @substream: the PCM substream instance
1243  *
1244  * Return: Zero if successful, or a negative error code.
1245  * The stream lock must be acquired before calling this function.
1246  */
1247 int snd_pcm_start(struct snd_pcm_substream *substream)
1248 {
1249         return snd_pcm_action(&snd_pcm_action_start, substream,
1250                               SNDRV_PCM_STATE_RUNNING);
1251 }
1252 
1253 /* take the stream lock and start the streams */
1254 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1255 {
1256         return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1257                                        SNDRV_PCM_STATE_RUNNING);
1258 }
1259 
1260 /*
1261  * stop callbacks
1262  */
1263 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1264 {
1265         struct snd_pcm_runtime *runtime = substream->runtime;
1266         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1267                 return -EBADFD;
1268         runtime->trigger_master = substream;
1269         return 0;
1270 }
1271 
1272 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1273 {
1274         if (substream->runtime->trigger_master == substream &&
1275             snd_pcm_running(substream))
1276                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1277         return 0; /* unconditonally stop all substreams */
1278 }
1279 
1280 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1281 {
1282         struct snd_pcm_runtime *runtime = substream->runtime;
1283         if (runtime->status->state != state) {
1284                 snd_pcm_trigger_tstamp(substream);
1285                 runtime->status->state = state;
1286                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1287         }
1288         wake_up(&runtime->sleep);
1289         wake_up(&runtime->tsleep);
1290 }
1291 
1292 static const struct action_ops snd_pcm_action_stop = {
1293         .pre_action = snd_pcm_pre_stop,
1294         .do_action = snd_pcm_do_stop,
1295         .post_action = snd_pcm_post_stop
1296 };
1297 
1298 /**
1299  * snd_pcm_stop - try to stop all running streams in the substream group
1300  * @substream: the PCM substream instance
1301  * @state: PCM state after stopping the stream
1302  *
1303  * The state of each stream is then changed to the given state unconditionally.
1304  *
1305  * Return: Zero if successful, or a negative error code.
1306  */
1307 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1308 {
1309         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1310 }
1311 EXPORT_SYMBOL(snd_pcm_stop);
1312 
1313 /**
1314  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1315  * @substream: the PCM substream
1316  *
1317  * After stopping, the state is changed to SETUP.
1318  * Unlike snd_pcm_stop(), this affects only the given stream.
1319  *
1320  * Return: Zero if succesful, or a negative error code.
1321  */
1322 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1323 {
1324         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1325                                      SNDRV_PCM_STATE_SETUP);
1326 }
1327 
1328 /**
1329  * snd_pcm_stop_xrun - stop the running streams as XRUN
1330  * @substream: the PCM substream instance
1331  *
1332  * This stops the given running substream (and all linked substreams) as XRUN.
1333  * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1334  *
1335  * Return: Zero if successful, or a negative error code.
1336  */
1337 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1338 {
1339         unsigned long flags;
1340 
1341         snd_pcm_stream_lock_irqsave(substream, flags);
1342         if (substream->runtime && snd_pcm_running(substream))
1343                 __snd_pcm_xrun(substream);
1344         snd_pcm_stream_unlock_irqrestore(substream, flags);
1345         return 0;
1346 }
1347 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1348 
1349 /*
1350  * pause callbacks
1351  */
1352 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1353 {
1354         struct snd_pcm_runtime *runtime = substream->runtime;
1355         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1356                 return -ENOSYS;
1357         if (push) {
1358                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1359                         return -EBADFD;
1360         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1361                 return -EBADFD;
1362         runtime->trigger_master = substream;
1363         return 0;
1364 }
1365 
1366 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1367 {
1368         if (substream->runtime->trigger_master != substream)
1369                 return 0;
1370         /* some drivers might use hw_ptr to recover from the pause -
1371            update the hw_ptr now */
1372         if (push)
1373                 snd_pcm_update_hw_ptr(substream);
1374         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1375          * a delta between the current jiffies, this gives a large enough
1376          * delta, effectively to skip the check once.
1377          */
1378         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1379         return substream->ops->trigger(substream,
1380                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1381                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1382 }
1383 
1384 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1385 {
1386         if (substream->runtime->trigger_master == substream)
1387                 substream->ops->trigger(substream,
1388                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1389                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1390 }
1391 
1392 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1393 {
1394         struct snd_pcm_runtime *runtime = substream->runtime;
1395         snd_pcm_trigger_tstamp(substream);
1396         if (push) {
1397                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1398                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1399                 wake_up(&runtime->sleep);
1400                 wake_up(&runtime->tsleep);
1401         } else {
1402                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1403                 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1404         }
1405 }
1406 
1407 static const struct action_ops snd_pcm_action_pause = {
1408         .pre_action = snd_pcm_pre_pause,
1409         .do_action = snd_pcm_do_pause,
1410         .undo_action = snd_pcm_undo_pause,
1411         .post_action = snd_pcm_post_pause
1412 };
1413 
1414 /*
1415  * Push/release the pause for all linked streams.
1416  */
1417 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1418 {
1419         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1420 }
1421 
1422 #ifdef CONFIG_PM
1423 /* suspend */
1424 
1425 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1426 {
1427         struct snd_pcm_runtime *runtime = substream->runtime;
1428         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1429                 return -EBUSY;
1430         runtime->trigger_master = substream;
1431         return 0;
1432 }
1433 
1434 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1435 {
1436         struct snd_pcm_runtime *runtime = substream->runtime;
1437         if (runtime->trigger_master != substream)
1438                 return 0;
1439         if (! snd_pcm_running(substream))
1440                 return 0;
1441         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1442         return 0; /* suspend unconditionally */
1443 }
1444 
1445 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1446 {
1447         struct snd_pcm_runtime *runtime = substream->runtime;
1448         snd_pcm_trigger_tstamp(substream);
1449         runtime->status->suspended_state = runtime->status->state;
1450         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1451         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1452         wake_up(&runtime->sleep);
1453         wake_up(&runtime->tsleep);
1454 }
1455 
1456 static const struct action_ops snd_pcm_action_suspend = {
1457         .pre_action = snd_pcm_pre_suspend,
1458         .do_action = snd_pcm_do_suspend,
1459         .post_action = snd_pcm_post_suspend
1460 };
1461 
1462 /**
1463  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1464  * @substream: the PCM substream
1465  *
1466  * After this call, all streams are changed to SUSPENDED state.
1467  *
1468  * Return: Zero if successful (or @substream is %NULL), or a negative error
1469  * code.
1470  */
1471 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1472 {
1473         int err;
1474         unsigned long flags;
1475 
1476         if (! substream)
1477                 return 0;
1478 
1479         snd_pcm_stream_lock_irqsave(substream, flags);
1480         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1481         snd_pcm_stream_unlock_irqrestore(substream, flags);
1482         return err;
1483 }
1484 EXPORT_SYMBOL(snd_pcm_suspend);
1485 
1486 /**
1487  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1488  * @pcm: the PCM instance
1489  *
1490  * After this call, all streams are changed to SUSPENDED state.
1491  *
1492  * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1493  */
1494 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1495 {
1496         struct snd_pcm_substream *substream;
1497         int stream, err = 0;
1498 
1499         if (! pcm)
1500                 return 0;
1501 
1502         for (stream = 0; stream < 2; stream++) {
1503                 for (substream = pcm->streams[stream].substream;
1504                      substream; substream = substream->next) {
1505                         /* FIXME: the open/close code should lock this as well */
1506                         if (substream->runtime == NULL)
1507                                 continue;
1508                         err = snd_pcm_suspend(substream);
1509                         if (err < 0 && err != -EBUSY)
1510                                 return err;
1511                 }
1512         }
1513         return 0;
1514 }
1515 EXPORT_SYMBOL(snd_pcm_suspend_all);
1516 
1517 /* resume */
1518 
1519 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1520 {
1521         struct snd_pcm_runtime *runtime = substream->runtime;
1522         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1523                 return -ENOSYS;
1524         runtime->trigger_master = substream;
1525         return 0;
1526 }
1527 
1528 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1529 {
1530         struct snd_pcm_runtime *runtime = substream->runtime;
1531         if (runtime->trigger_master != substream)
1532                 return 0;
1533         /* DMA not running previously? */
1534         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1535             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1536              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1537                 return 0;
1538         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1539 }
1540 
1541 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1542 {
1543         if (substream->runtime->trigger_master == substream &&
1544             snd_pcm_running(substream))
1545                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1546 }
1547 
1548 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1549 {
1550         struct snd_pcm_runtime *runtime = substream->runtime;
1551         snd_pcm_trigger_tstamp(substream);
1552         runtime->status->state = runtime->status->suspended_state;
1553         snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1554 }
1555 
1556 static const struct action_ops snd_pcm_action_resume = {
1557         .pre_action = snd_pcm_pre_resume,
1558         .do_action = snd_pcm_do_resume,
1559         .undo_action = snd_pcm_undo_resume,
1560         .post_action = snd_pcm_post_resume
1561 };
1562 
1563 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1564 {
1565         return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1566 }
1567 
1568 #else
1569 
1570 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1571 {
1572         return -ENOSYS;
1573 }
1574 
1575 #endif /* CONFIG_PM */
1576 
1577 /*
1578  * xrun ioctl
1579  *
1580  * Change the RUNNING stream(s) to XRUN state.
1581  */
1582 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1583 {
1584         struct snd_pcm_runtime *runtime = substream->runtime;
1585         int result;
1586 
1587         snd_pcm_stream_lock_irq(substream);
1588         switch (runtime->status->state) {
1589         case SNDRV_PCM_STATE_XRUN:
1590                 result = 0;     /* already there */
1591                 break;
1592         case SNDRV_PCM_STATE_RUNNING:
1593                 __snd_pcm_xrun(substream);
1594                 result = 0;
1595                 break;
1596         default:
1597                 result = -EBADFD;
1598         }
1599         snd_pcm_stream_unlock_irq(substream);
1600         return result;
1601 }
1602 
1603 /*
1604  * reset ioctl
1605  */
1606 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1607 {
1608         struct snd_pcm_runtime *runtime = substream->runtime;
1609         switch (runtime->status->state) {
1610         case SNDRV_PCM_STATE_RUNNING:
1611         case SNDRV_PCM_STATE_PREPARED:
1612         case SNDRV_PCM_STATE_PAUSED:
1613         case SNDRV_PCM_STATE_SUSPENDED:
1614                 return 0;
1615         default:
1616                 return -EBADFD;
1617         }
1618 }
1619 
1620 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1621 {
1622         struct snd_pcm_runtime *runtime = substream->runtime;
1623         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1624         if (err < 0)
1625                 return err;
1626         runtime->hw_ptr_base = 0;
1627         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1628                 runtime->status->hw_ptr % runtime->period_size;
1629         runtime->silence_start = runtime->status->hw_ptr;
1630         runtime->silence_filled = 0;
1631         return 0;
1632 }
1633 
1634 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1635 {
1636         struct snd_pcm_runtime *runtime = substream->runtime;
1637         runtime->control->appl_ptr = runtime->status->hw_ptr;
1638         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1639             runtime->silence_size > 0)
1640                 snd_pcm_playback_silence(substream, ULONG_MAX);
1641 }
1642 
1643 static const struct action_ops snd_pcm_action_reset = {
1644         .pre_action = snd_pcm_pre_reset,
1645         .do_action = snd_pcm_do_reset,
1646         .post_action = snd_pcm_post_reset
1647 };
1648 
1649 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1650 {
1651         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1652 }
1653 
1654 /*
1655  * prepare ioctl
1656  */
1657 /* we use the second argument for updating f_flags */
1658 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1659                                int f_flags)
1660 {
1661         struct snd_pcm_runtime *runtime = substream->runtime;
1662         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1663             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1664                 return -EBADFD;
1665         if (snd_pcm_running(substream))
1666                 return -EBUSY;
1667         substream->f_flags = f_flags;
1668         return 0;
1669 }
1670 
1671 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1672 {
1673         int err;
1674         err = substream->ops->prepare(substream);
1675         if (err < 0)
1676                 return err;
1677         return snd_pcm_do_reset(substream, 0);
1678 }
1679 
1680 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1681 {
1682         struct snd_pcm_runtime *runtime = substream->runtime;
1683         runtime->control->appl_ptr = runtime->status->hw_ptr;
1684         snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1685 }
1686 
1687 static const struct action_ops snd_pcm_action_prepare = {
1688         .pre_action = snd_pcm_pre_prepare,
1689         .do_action = snd_pcm_do_prepare,
1690         .post_action = snd_pcm_post_prepare
1691 };
1692 
1693 /**
1694  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1695  * @substream: the PCM substream instance
1696  * @file: file to refer f_flags
1697  *
1698  * Return: Zero if successful, or a negative error code.
1699  */
1700 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1701                            struct file *file)
1702 {
1703         int f_flags;
1704 
1705         if (file)
1706                 f_flags = file->f_flags;
1707         else
1708                 f_flags = substream->f_flags;
1709 
1710         snd_pcm_stream_lock_irq(substream);
1711         switch (substream->runtime->status->state) {
1712         case SNDRV_PCM_STATE_PAUSED:
1713                 snd_pcm_pause(substream, 0);
1714                 /* fallthru */
1715         case SNDRV_PCM_STATE_SUSPENDED:
1716                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1717                 break;
1718         }
1719         snd_pcm_stream_unlock_irq(substream);
1720 
1721         return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1722                                         substream, f_flags);
1723 }
1724 
1725 /*
1726  * drain ioctl
1727  */
1728 
1729 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1730 {
1731         struct snd_pcm_runtime *runtime = substream->runtime;
1732         switch (runtime->status->state) {
1733         case SNDRV_PCM_STATE_OPEN:
1734         case SNDRV_PCM_STATE_DISCONNECTED:
1735         case SNDRV_PCM_STATE_SUSPENDED:
1736                 return -EBADFD;
1737         }
1738         runtime->trigger_master = substream;
1739         return 0;
1740 }
1741 
1742 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1743 {
1744         struct snd_pcm_runtime *runtime = substream->runtime;
1745         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1746                 switch (runtime->status->state) {
1747                 case SNDRV_PCM_STATE_PREPARED:
1748                         /* start playback stream if possible */
1749                         if (! snd_pcm_playback_empty(substream)) {
1750                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1751                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1752                         } else {
1753                                 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1754                         }
1755                         break;
1756                 case SNDRV_PCM_STATE_RUNNING:
1757                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1758                         break;
1759                 case SNDRV_PCM_STATE_XRUN:
1760                         runtime->status->state = SNDRV_PCM_STATE_SETUP;
1761                         break;
1762                 default:
1763                         break;
1764                 }
1765         } else {
1766                 /* stop running stream */
1767                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1768                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1769                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1770                         snd_pcm_do_stop(substream, new_state);
1771                         snd_pcm_post_stop(substream, new_state);
1772                 }
1773         }
1774 
1775         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1776             runtime->trigger_master == substream &&
1777             (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1778                 return substream->ops->trigger(substream,
1779                                                SNDRV_PCM_TRIGGER_DRAIN);
1780 
1781         return 0;
1782 }
1783 
1784 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1785 {
1786 }
1787 
1788 static const struct action_ops snd_pcm_action_drain_init = {
1789         .pre_action = snd_pcm_pre_drain_init,
1790         .do_action = snd_pcm_do_drain_init,
1791         .post_action = snd_pcm_post_drain_init
1792 };
1793 
1794 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1795 
1796 /*
1797  * Drain the stream(s).
1798  * When the substream is linked, sync until the draining of all playback streams
1799  * is finished.
1800  * After this call, all streams are supposed to be either SETUP or DRAINING
1801  * (capture only) state.
1802  */
1803 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1804                          struct file *file)
1805 {
1806         struct snd_card *card;
1807         struct snd_pcm_runtime *runtime;
1808         struct snd_pcm_substream *s;
1809         wait_queue_entry_t wait;
1810         int result = 0;
1811         int nonblock = 0;
1812 
1813         card = substream->pcm->card;
1814         runtime = substream->runtime;
1815 
1816         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1817                 return -EBADFD;
1818 
1819         if (file) {
1820                 if (file->f_flags & O_NONBLOCK)
1821                         nonblock = 1;
1822         } else if (substream->f_flags & O_NONBLOCK)
1823                 nonblock = 1;
1824 
1825         down_read(&snd_pcm_link_rwsem);
1826         snd_pcm_stream_lock_irq(substream);
1827         /* resume pause */
1828         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1829                 snd_pcm_pause(substream, 0);
1830 
1831         /* pre-start/stop - all running streams are changed to DRAINING state */
1832         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1833         if (result < 0)
1834                 goto unlock;
1835         /* in non-blocking, we don't wait in ioctl but let caller poll */
1836         if (nonblock) {
1837                 result = -EAGAIN;
1838                 goto unlock;
1839         }
1840 
1841         for (;;) {
1842                 long tout;
1843                 struct snd_pcm_runtime *to_check;
1844                 if (signal_pending(current)) {
1845                         result = -ERESTARTSYS;
1846                         break;
1847                 }
1848                 /* find a substream to drain */
1849                 to_check = NULL;
1850                 snd_pcm_group_for_each_entry(s, substream) {
1851                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1852                                 continue;
1853                         runtime = s->runtime;
1854                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1855                                 to_check = runtime;
1856                                 break;
1857                         }
1858                 }
1859                 if (!to_check)
1860                         break; /* all drained */
1861                 init_waitqueue_entry(&wait, current);
1862                 add_wait_queue(&to_check->sleep, &wait);
1863                 snd_pcm_stream_unlock_irq(substream);
1864                 up_read(&snd_pcm_link_rwsem);
1865                 if (runtime->no_period_wakeup)
1866                         tout = MAX_SCHEDULE_TIMEOUT;
1867                 else {
1868                         tout = 10;
1869                         if (runtime->rate) {
1870                                 long t = runtime->period_size * 2 / runtime->rate;
1871                                 tout = max(t, tout);
1872                         }
1873                         tout = msecs_to_jiffies(tout * 1000);
1874                 }
1875                 tout = schedule_timeout_interruptible(tout);
1876                 down_read(&snd_pcm_link_rwsem);
1877                 snd_pcm_stream_lock_irq(substream);
1878                 remove_wait_queue(&to_check->sleep, &wait);
1879                 if (card->shutdown) {
1880                         result = -ENODEV;
1881                         break;
1882                 }
1883                 if (tout == 0) {
1884                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1885                                 result = -ESTRPIPE;
1886                         else {
1887                                 dev_dbg(substream->pcm->card->dev,
1888                                         "playback drain error (DMA or IRQ trouble?)\n");
1889                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1890                                 result = -EIO;
1891                         }
1892                         break;
1893                 }
1894         }
1895 
1896  unlock:
1897         snd_pcm_stream_unlock_irq(substream);
1898         up_read(&snd_pcm_link_rwsem);
1899 
1900         return result;
1901 }
1902 
1903 /*
1904  * drop ioctl
1905  *
1906  * Immediately put all linked substreams into SETUP state.
1907  */
1908 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1909 {
1910         struct snd_pcm_runtime *runtime;
1911         int result = 0;
1912         
1913         if (PCM_RUNTIME_CHECK(substream))
1914                 return -ENXIO;
1915         runtime = substream->runtime;
1916 
1917         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1918             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1919                 return -EBADFD;
1920 
1921         snd_pcm_stream_lock_irq(substream);
1922         /* resume pause */
1923         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1924                 snd_pcm_pause(substream, 0);
1925 
1926         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1927         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1928         snd_pcm_stream_unlock_irq(substream);
1929 
1930         return result;
1931 }
1932 
1933 
1934 static bool is_pcm_file(struct file *file)
1935 {
1936         struct inode *inode = file_inode(file);
1937         unsigned int minor;
1938 
1939         if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1940                 return false;
1941         minor = iminor(inode);
1942         return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1943                 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1944 }
1945 
1946 /*
1947  * PCM link handling
1948  */
1949 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1950 {
1951         int res = 0;
1952         struct snd_pcm_file *pcm_file;
1953         struct snd_pcm_substream *substream1;
1954         struct snd_pcm_group *group;
1955         struct fd f = fdget(fd);
1956 
1957         if (!f.file)
1958                 return -EBADFD;
1959         if (!is_pcm_file(f.file)) {
1960                 res = -EBADFD;
1961                 goto _badf;
1962         }
1963         pcm_file = f.file->private_data;
1964         substream1 = pcm_file->substream;
1965         group = kmalloc(sizeof(*group), GFP_KERNEL);
1966         if (!group) {
1967                 res = -ENOMEM;
1968                 goto _nolock;
1969         }
1970         down_write_nonblock(&snd_pcm_link_rwsem);
1971         write_lock_irq(&snd_pcm_link_rwlock);
1972         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1973             substream->runtime->status->state != substream1->runtime->status->state ||
1974             substream->pcm->nonatomic != substream1->pcm->nonatomic) {
1975                 res = -EBADFD;
1976                 goto _end;
1977         }
1978         if (snd_pcm_stream_linked(substream1)) {
1979                 res = -EALREADY;
1980                 goto _end;
1981         }
1982         if (!snd_pcm_stream_linked(substream)) {
1983                 substream->group = group;
1984                 group = NULL;
1985                 spin_lock_init(&substream->group->lock);
1986                 mutex_init(&substream->group->mutex);
1987                 INIT_LIST_HEAD(&substream->group->substreams);
1988                 list_add_tail(&substream->link_list, &substream->group->substreams);
1989                 substream->group->count = 1;
1990         }
1991         list_add_tail(&substream1->link_list, &substream->group->substreams);
1992         substream->group->count++;
1993         substream1->group = substream->group;
1994  _end:
1995         write_unlock_irq(&snd_pcm_link_rwlock);
1996         up_write(&snd_pcm_link_rwsem);
1997  _nolock:
1998         snd_card_unref(substream1->pcm->card);
1999         kfree(group);
2000  _badf:
2001         fdput(f);
2002         return res;
2003 }
2004 
2005 static void relink_to_local(struct snd_pcm_substream *substream)
2006 {
2007         substream->group = &substream->self_group;
2008         INIT_LIST_HEAD(&substream->self_group.substreams);
2009         list_add_tail(&substream->link_list, &substream->self_group.substreams);
2010 }
2011 
2012 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
2013 {
2014         struct snd_pcm_substream *s;
2015         int res = 0;
2016 
2017         down_write_nonblock(&snd_pcm_link_rwsem);
2018         write_lock_irq(&snd_pcm_link_rwlock);
2019         if (!snd_pcm_stream_linked(substream)) {
2020                 res = -EALREADY;
2021                 goto _end;
2022         }
2023         list_del(&substream->link_list);
2024         substream->group->count--;
2025         if (substream->group->count == 1) {     /* detach the last stream, too */
2026                 snd_pcm_group_for_each_entry(s, substream) {
2027                         relink_to_local(s);
2028                         break;
2029                 }
2030                 kfree(substream->group);
2031         }
2032         relink_to_local(substream);
2033        _end:
2034         write_unlock_irq(&snd_pcm_link_rwlock);
2035         up_write(&snd_pcm_link_rwsem);
2036         return res;
2037 }
2038 
2039 /*
2040  * hw configurator
2041  */
2042 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2043                                struct snd_pcm_hw_rule *rule)
2044 {
2045         struct snd_interval t;
2046         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2047                      hw_param_interval_c(params, rule->deps[1]), &t);
2048         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2049 }
2050 
2051 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2052                                struct snd_pcm_hw_rule *rule)
2053 {
2054         struct snd_interval t;
2055         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2056                      hw_param_interval_c(params, rule->deps[1]), &t);
2057         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2058 }
2059 
2060 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2061                                    struct snd_pcm_hw_rule *rule)
2062 {
2063         struct snd_interval t;
2064         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2065                          hw_param_interval_c(params, rule->deps[1]),
2066                          (unsigned long) rule->private, &t);
2067         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2068 }
2069 
2070 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2071                                    struct snd_pcm_hw_rule *rule)
2072 {
2073         struct snd_interval t;
2074         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2075                          (unsigned long) rule->private,
2076                          hw_param_interval_c(params, rule->deps[1]), &t);
2077         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2078 }
2079 
2080 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2081                                   struct snd_pcm_hw_rule *rule)
2082 {
2083         unsigned int k;
2084         const struct snd_interval *i =
2085                                 hw_param_interval_c(params, rule->deps[0]);
2086         struct snd_mask m;
2087         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2088         snd_mask_any(&m);
2089         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2090                 int bits;
2091                 if (! snd_mask_test(mask, k))
2092                         continue;
2093                 bits = snd_pcm_format_physical_width(k);
2094                 if (bits <= 0)
2095                         continue; /* ignore invalid formats */
2096                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2097                         snd_mask_reset(&m, k);
2098         }
2099         return snd_mask_refine(mask, &m);
2100 }
2101 
2102 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2103                                        struct snd_pcm_hw_rule *rule)
2104 {
2105         struct snd_interval t;
2106         unsigned int k;
2107         t.min = UINT_MAX;
2108         t.max = 0;
2109         t.openmin = 0;
2110         t.openmax = 0;
2111         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
2112                 int bits;
2113                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2114                         continue;
2115                 bits = snd_pcm_format_physical_width(k);
2116                 if (bits <= 0)
2117                         continue; /* ignore invalid formats */
2118                 if (t.min > (unsigned)bits)
2119                         t.min = bits;
2120                 if (t.max < (unsigned)bits)
2121                         t.max = bits;
2122         }
2123         t.integer = 1;
2124         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2125 }
2126 
2127 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2128 #error "Change this table"
2129 #endif
2130 
2131 static const unsigned int rates[] = {
2132         5512, 8000, 11025, 16000, 22050, 32000, 44100,
2133         48000, 64000, 88200, 96000, 176400, 192000
2134 };
2135 
2136 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2137         .count = ARRAY_SIZE(rates),
2138         .list = rates,
2139 };
2140 
2141 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2142                                 struct snd_pcm_hw_rule *rule)
2143 {
2144         struct snd_pcm_hardware *hw = rule->private;
2145         return snd_interval_list(hw_param_interval(params, rule->var),
2146                                  snd_pcm_known_rates.count,
2147                                  snd_pcm_known_rates.list, hw->rates);
2148 }               
2149 
2150 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2151                                             struct snd_pcm_hw_rule *rule)
2152 {
2153         struct snd_interval t;
2154         struct snd_pcm_substream *substream = rule->private;
2155         t.min = 0;
2156         t.max = substream->buffer_bytes_max;
2157         t.openmin = 0;
2158         t.openmax = 0;
2159         t.integer = 1;
2160         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2161 }               
2162 
2163 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2164 {
2165         struct snd_pcm_runtime *runtime = substream->runtime;
2166         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2167         int k, err;
2168 
2169         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2170                 snd_mask_any(constrs_mask(constrs, k));
2171         }
2172 
2173         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2174                 snd_interval_any(constrs_interval(constrs, k));
2175         }
2176 
2177         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2178         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2179         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2180         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2181         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2182 
2183         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2184                                    snd_pcm_hw_rule_format, NULL,
2185                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2186         if (err < 0)
2187                 return err;
2188         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 
2189                                   snd_pcm_hw_rule_sample_bits, NULL,
2190                                   SNDRV_PCM_HW_PARAM_FORMAT, 
2191                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2192         if (err < 0)
2193                 return err;
2194         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 
2195                                   snd_pcm_hw_rule_div, NULL,
2196                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2197         if (err < 0)
2198                 return err;
2199         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
2200                                   snd_pcm_hw_rule_mul, NULL,
2201                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2202         if (err < 0)
2203                 return err;
2204         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
2205                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2206                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2207         if (err < 0)
2208                 return err;
2209         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
2210                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2211                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2212         if (err < 0)
2213                 return err;
2214         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 
2215                                   snd_pcm_hw_rule_div, NULL,
2216                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2217         if (err < 0)
2218                 return err;
2219         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
2220                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2221                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2222         if (err < 0)
2223                 return err;
2224         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
2225                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2226                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2227         if (err < 0)
2228                 return err;
2229         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 
2230                                   snd_pcm_hw_rule_div, NULL,
2231                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2232         if (err < 0)
2233                 return err;
2234         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
2235                                   snd_pcm_hw_rule_div, NULL,
2236                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2237         if (err < 0)
2238                 return err;
2239         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
2240                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2241                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2242         if (err < 0)
2243                 return err;
2244         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
2245                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2246                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2247         if (err < 0)
2248                 return err;
2249         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
2250                                   snd_pcm_hw_rule_mul, NULL,
2251                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2252         if (err < 0)
2253                 return err;
2254         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
2255                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2256                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2257         if (err < 0)
2258                 return err;
2259         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
2260                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2261                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2262         if (err < 0)
2263                 return err;
2264         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 
2265                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2266                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2267         if (err < 0)
2268                 return err;
2269         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 
2270                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2271                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2272         if (err < 0)
2273                 return err;
2274         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 
2275                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2276                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2277         if (err < 0)
2278                 return err;
2279         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 
2280                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2281                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2282         if (err < 0)
2283                 return err;
2284         return 0;
2285 }
2286 
2287 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2288 {
2289         struct snd_pcm_runtime *runtime = substream->runtime;
2290         struct snd_pcm_hardware *hw = &runtime->hw;
2291         int err;
2292         unsigned int mask = 0;
2293 
2294         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2295                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2296         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2297                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2298         if (hw_support_mmap(substream)) {
2299                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2300                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2301                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2302                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2303                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2304                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2305         }
2306         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2307         if (err < 0)
2308                 return err;
2309 
2310         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2311         if (err < 0)
2312                 return err;
2313 
2314         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2315         if (err < 0)
2316                 return err;
2317 
2318         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2319                                            hw->channels_min, hw->channels_max);
2320         if (err < 0)
2321                 return err;
2322 
2323         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2324                                            hw->rate_min, hw->rate_max);
2325         if (err < 0)
2326                 return err;
2327 
2328         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2329                                            hw->period_bytes_min, hw->period_bytes_max);
2330         if (err < 0)
2331                 return err;
2332 
2333         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2334                                            hw->periods_min, hw->periods_max);
2335         if (err < 0)
2336                 return err;
2337 
2338         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2339                                            hw->period_bytes_min, hw->buffer_bytes_max);
2340         if (err < 0)
2341                 return err;
2342 
2343         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 
2344                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
2345                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2346         if (err < 0)
2347                 return err;
2348 
2349         /* FIXME: remove */
2350         if (runtime->dma_bytes) {
2351                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2352                 if (err < 0)
2353                         return err;
2354         }
2355 
2356         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2357                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
2358                                           snd_pcm_hw_rule_rate, hw,
2359                                           SNDRV_PCM_HW_PARAM_RATE, -1);
2360                 if (err < 0)
2361                         return err;
2362         }
2363 
2364         /* FIXME: this belong to lowlevel */
2365         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2366 
2367         return 0;
2368 }
2369 
2370 static void pcm_release_private(struct snd_pcm_substream *substream)
2371 {
2372         snd_pcm_unlink(substream);
2373 }
2374 
2375 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2376 {
2377         substream->ref_count--;
2378         if (substream->ref_count > 0)
2379                 return;
2380 
2381         snd_pcm_drop(substream);
2382         if (substream->hw_opened) {
2383                 if (substream->ops->hw_free &&
2384                     substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
2385                         substream->ops->hw_free(substream);
2386                 substream->ops->close(substream);
2387                 substream->hw_opened = 0;
2388         }
2389         if (pm_qos_request_active(&substream->latency_pm_qos_req))
2390                 pm_qos_remove_request(&substream->latency_pm_qos_req);
2391         if (substream->pcm_release) {
2392                 substream->pcm_release(substream);
2393                 substream->pcm_release = NULL;
2394         }
2395         snd_pcm_detach_substream(substream);
2396 }
2397 EXPORT_SYMBOL(snd_pcm_release_substream);
2398 
2399 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2400                            struct file *file,
2401                            struct snd_pcm_substream **rsubstream)
2402 {
2403         struct snd_pcm_substream *substream;
2404         int err;
2405 
2406         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2407         if (err < 0)
2408                 return err;
2409         if (substream->ref_count > 1) {
2410                 *rsubstream = substream;
2411                 return 0;
2412         }
2413 
2414         err = snd_pcm_hw_constraints_init(substream);
2415         if (err < 0) {
2416                 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2417                 goto error;
2418         }
2419 
2420         if ((err = substream->ops->open(substream)) < 0)
2421                 goto error;
2422 
2423         substream->hw_opened = 1;
2424 
2425         err = snd_pcm_hw_constraints_complete(substream);
2426         if (err < 0) {
2427                 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2428                 goto error;
2429         }
2430 
2431         *rsubstream = substream;
2432         return 0;
2433 
2434  error:
2435         snd_pcm_release_substream(substream);
2436         return err;
2437 }
2438 EXPORT_SYMBOL(snd_pcm_open_substream);
2439 
2440 static int snd_pcm_open_file(struct file *file,
2441                              struct snd_pcm *pcm,
2442                              int stream)
2443 {
2444         struct snd_pcm_file *pcm_file;
2445         struct snd_pcm_substream *substream;
2446         int err;
2447 
2448         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2449         if (err < 0)
2450                 return err;
2451 
2452         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2453         if (pcm_file == NULL) {
2454                 snd_pcm_release_substream(substream);
2455                 return -ENOMEM;
2456         }
2457         pcm_file->substream = substream;
2458         if (substream->ref_count == 1) {
2459                 substream->file = pcm_file;
2460                 substream->pcm_release = pcm_release_private;
2461         }
2462         file->private_data = pcm_file;
2463 
2464         return 0;
2465 }
2466 
2467 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2468 {
2469         struct snd_pcm *pcm;
2470         int err = nonseekable_open(inode, file);
2471         if (err < 0)
2472                 return err;
2473         pcm = snd_lookup_minor_data(iminor(inode),
2474                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2475         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2476         if (pcm)
2477                 snd_card_unref(pcm->card);
2478         return err;
2479 }
2480 
2481 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2482 {
2483         struct snd_pcm *pcm;
2484         int err = nonseekable_open(inode, file);
2485         if (err < 0)
2486                 return err;
2487         pcm = snd_lookup_minor_data(iminor(inode),
2488                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2489         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2490         if (pcm)
2491                 snd_card_unref(pcm->card);
2492         return err;
2493 }
2494 
2495 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2496 {
2497         int err;
2498         wait_queue_entry_t wait;
2499 
2500         if (pcm == NULL) {
2501                 err = -ENODEV;
2502                 goto __error1;
2503         }
2504         err = snd_card_file_add(pcm->card, file);
2505         if (err < 0)
2506                 goto __error1;
2507         if (!try_module_get(pcm->card->module)) {
2508                 err = -EFAULT;
2509                 goto __error2;
2510         }
2511         init_waitqueue_entry(&wait, current);
2512         add_wait_queue(&pcm->open_wait, &wait);
2513         mutex_lock(&pcm->open_mutex);
2514         while (1) {
2515                 err = snd_pcm_open_file(file, pcm, stream);
2516                 if (err >= 0)
2517                         break;
2518                 if (err == -EAGAIN) {
2519                         if (file->f_flags & O_NONBLOCK) {
2520                                 err = -EBUSY;
2521                                 break;
2522                         }
2523                 } else
2524                         break;
2525                 set_current_state(TASK_INTERRUPTIBLE);
2526                 mutex_unlock(&pcm->open_mutex);
2527                 schedule();
2528                 mutex_lock(&pcm->open_mutex);
2529                 if (pcm->card->shutdown) {
2530                         err = -ENODEV;
2531                         break;
2532                 }
2533                 if (signal_pending(current)) {
2534                         err = -ERESTARTSYS;
2535                         break;
2536                 }
2537         }
2538         remove_wait_queue(&pcm->open_wait, &wait);
2539         mutex_unlock(&pcm->open_mutex);
2540         if (err < 0)
2541                 goto __error;
2542         return err;
2543 
2544       __error:
2545         module_put(pcm->card->module);
2546       __error2:
2547         snd_card_file_remove(pcm->card, file);
2548       __error1:
2549         return err;
2550 }
2551 
2552 static int snd_pcm_release(struct inode *inode, struct file *file)
2553 {
2554         struct snd_pcm *pcm;
2555         struct snd_pcm_substream *substream;
2556         struct snd_pcm_file *pcm_file;
2557 
2558         pcm_file = file->private_data;
2559         substream = pcm_file->substream;
2560         if (snd_BUG_ON(!substream))
2561                 return -ENXIO;
2562         pcm = substream->pcm;
2563         mutex_lock(&pcm->open_mutex);
2564         snd_pcm_release_substream(substream);
2565         kfree(pcm_file);
2566         mutex_unlock(&pcm->open_mutex);
2567         wake_up(&pcm->open_wait);
2568         module_put(pcm->card->module);
2569         snd_card_file_remove(pcm->card, file);
2570         return 0;
2571 }
2572 
2573 /* check and update PCM state; return 0 or a negative error
2574  * call this inside PCM lock
2575  */
2576 static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2577 {
2578         switch (substream->runtime->status->state) {
2579         case SNDRV_PCM_STATE_DRAINING:
2580                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2581                         return -EBADFD;
2582                 /* Fall through */
2583         case SNDRV_PCM_STATE_RUNNING:
2584                 return snd_pcm_update_hw_ptr(substream);
2585         case SNDRV_PCM_STATE_PREPARED:
2586         case SNDRV_PCM_STATE_PAUSED:
2587                 return 0;
2588         case SNDRV_PCM_STATE_SUSPENDED:
2589                 return -ESTRPIPE;
2590         case SNDRV_PCM_STATE_XRUN:
2591                 return -EPIPE;
2592         default:
2593                 return -EBADFD;
2594         }
2595 }
2596 
2597 /* increase the appl_ptr; returns the processed frames or a negative error */
2598 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2599                                           snd_pcm_uframes_t frames,
2600                                            snd_pcm_sframes_t avail)
2601 {
2602         struct snd_pcm_runtime *runtime = substream->runtime;
2603         snd_pcm_sframes_t appl_ptr;
2604         int ret;
2605 
2606         if (avail <= 0)
2607                 return 0;
2608         if (frames > (snd_pcm_uframes_t)avail)
2609                 frames = avail;
2610         appl_ptr = runtime->control->appl_ptr + frames;
2611         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2612                 appl_ptr -= runtime->boundary;
2613         ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2614         return ret < 0 ? ret : frames;
2615 }
2616 
2617 /* decrease the appl_ptr; returns the processed frames or zero for error */
2618 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2619                                          snd_pcm_uframes_t frames,
2620                                          snd_pcm_sframes_t avail)
2621 {
2622         struct snd_pcm_runtime *runtime = substream->runtime;
2623         snd_pcm_sframes_t appl_ptr;
2624         int ret;
2625 
2626         if (avail <= 0)
2627                 return 0;
2628         if (frames > (snd_pcm_uframes_t)avail)
2629                 frames = avail;
2630         appl_ptr = runtime->control->appl_ptr - frames;
2631         if (appl_ptr < 0)
2632                 appl_ptr += runtime->boundary;
2633         ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2634         /* NOTE: we return zero for errors because PulseAudio gets depressed
2635          * upon receiving an error from rewind ioctl and stops processing
2636          * any longer.  Returning zero means that no rewind is done, so
2637          * it's not absolutely wrong to answer like that.
2638          */
2639         return ret < 0 ? 0 : frames;
2640 }
2641 
2642 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
2643                                         snd_pcm_uframes_t frames)
2644 {
2645         snd_pcm_sframes_t ret;
2646 
2647         if (frames == 0)
2648                 return 0;
2649 
2650         snd_pcm_stream_lock_irq(substream);
2651         ret = do_pcm_hwsync(substream);
2652         if (!ret)
2653                 ret = rewind_appl_ptr(substream, frames,
2654                                       snd_pcm_hw_avail(substream));
2655         snd_pcm_stream_unlock_irq(substream);
2656         return ret;
2657 }
2658 
2659 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
2660                                          snd_pcm_uframes_t frames)
2661 {
2662         snd_pcm_sframes_t ret;
2663 
2664         if (frames == 0)
2665                 return 0;
2666 
2667         snd_pcm_stream_lock_irq(substream);
2668         ret = do_pcm_hwsync(substream);
2669         if (!ret)
2670                 ret = forward_appl_ptr(substream, frames,
2671                                        snd_pcm_avail(substream));
2672         snd_pcm_stream_unlock_irq(substream);
2673         return ret;
2674 }
2675 
2676 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2677 {
2678         int err;
2679 
2680         snd_pcm_stream_lock_irq(substream);
2681         err = do_pcm_hwsync(substream);
2682         snd_pcm_stream_unlock_irq(substream);
2683         return err;
2684 }
2685                 
2686 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2687                          snd_pcm_sframes_t *delay)
2688 {
2689         int err;
2690         snd_pcm_sframes_t n = 0;
2691 
2692         snd_pcm_stream_lock_irq(substream);
2693         err = do_pcm_hwsync(substream);
2694         if (!err)
2695                 n = snd_pcm_calc_delay(substream);
2696         snd_pcm_stream_unlock_irq(substream);
2697         if (!err)
2698                 *delay = n;
2699         return err;
2700 }
2701                 
2702 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2703                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2704 {
2705         struct snd_pcm_runtime *runtime = substream->runtime;
2706         struct snd_pcm_sync_ptr sync_ptr;
2707         volatile struct snd_pcm_mmap_status *status;
2708         volatile struct snd_pcm_mmap_control *control;
2709         int err;
2710 
2711         memset(&sync_ptr, 0, sizeof(sync_ptr));
2712         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2713                 return -EFAULT;
2714         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2715                 return -EFAULT; 
2716         status = runtime->status;
2717         control = runtime->control;
2718         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2719                 err = snd_pcm_hwsync(substream);
2720                 if (err < 0)
2721                         return err;
2722         }
2723         snd_pcm_stream_lock_irq(substream);
2724         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
2725                 err = pcm_lib_apply_appl_ptr(substream,
2726                                              sync_ptr.c.control.appl_ptr);
2727                 if (err < 0) {
2728                         snd_pcm_stream_unlock_irq(substream);
2729                         return err;
2730                 }
2731         } else {
2732                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2733         }
2734         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2735                 control->avail_min = sync_ptr.c.control.avail_min;
2736         else
2737                 sync_ptr.c.control.avail_min = control->avail_min;
2738         sync_ptr.s.status.state = status->state;
2739         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2740         sync_ptr.s.status.tstamp = status->tstamp;
2741         sync_ptr.s.status.suspended_state = status->suspended_state;
2742         sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
2743         snd_pcm_stream_unlock_irq(substream);
2744         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2745                 return -EFAULT;
2746         return 0;
2747 }
2748 
2749 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2750 {
2751         struct snd_pcm_runtime *runtime = substream->runtime;
2752         int arg;
2753         
2754         if (get_user(arg, _arg))
2755                 return -EFAULT;
2756         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2757                 return -EINVAL;
2758         runtime->tstamp_type = arg;
2759         return 0;
2760 }
2761 
2762 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
2763                                       struct snd_xferi __user *_xferi)
2764 {
2765         struct snd_xferi xferi;
2766         struct snd_pcm_runtime *runtime = substream->runtime;
2767         snd_pcm_sframes_t result;
2768 
2769         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2770                 return -EBADFD;
2771         if (put_user(0, &_xferi->result))
2772                 return -EFAULT;
2773         if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2774                 return -EFAULT;
2775         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2776                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2777         else
2778                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2779         __put_user(result, &_xferi->result);
2780         return result < 0 ? result : 0;
2781 }
2782 
2783 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
2784                                       struct snd_xfern __user *_xfern)
2785 {
2786         struct snd_xfern xfern;
2787         struct snd_pcm_runtime *runtime = substream->runtime;
2788         void *bufs;
2789         snd_pcm_sframes_t result;
2790 
2791         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2792                 return -EBADFD;
2793         if (runtime->channels > 128)
2794                 return -EINVAL;
2795         if (put_user(0, &_xfern->result))
2796                 return -EFAULT;
2797         if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2798                 return -EFAULT;
2799 
2800         bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
2801         if (IS_ERR(bufs))
2802                 return PTR_ERR(bufs);
2803         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2804                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2805         else
2806                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2807         kfree(bufs);
2808         __put_user(result, &_xfern->result);
2809         return result < 0 ? result : 0;
2810 }
2811 
2812 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
2813                                 snd_pcm_uframes_t __user *_frames)
2814 {
2815         snd_pcm_uframes_t frames;
2816         snd_pcm_sframes_t result;
2817 
2818         if (get_user(frames, _frames))
2819                 return -EFAULT;
2820         if (put_user(0, _frames))
2821                 return -EFAULT;
2822         result = snd_pcm_rewind(substream, frames);
2823         __put_user(result, _frames);
2824         return result < 0 ? result : 0;
2825 }
2826 
2827 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
2828                                  snd_pcm_uframes_t __user *_frames)
2829 {
2830         snd_pcm_uframes_t frames;
2831         snd_pcm_sframes_t result;
2832 
2833         if (get_user(frames, _frames))
2834                 return -EFAULT;
2835         if (put_user(0, _frames))
2836                 return -EFAULT;
2837         result = snd_pcm_forward(substream, frames);
2838         __put_user(result, _frames);
2839         return result < 0 ? result : 0;
2840 }
2841 
2842 static int snd_pcm_common_ioctl(struct file *file,
2843                                  struct snd_pcm_substream *substream,
2844                                  unsigned int cmd, void __user *arg)
2845 {
2846         struct snd_pcm_file *pcm_file = file->private_data;
2847         int res;
2848 
2849         if (PCM_RUNTIME_CHECK(substream))
2850                 return -ENXIO;
2851 
2852         res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0);
2853         if (res < 0)
2854                 return res;
2855 
2856         switch (cmd) {
2857         case SNDRV_PCM_IOCTL_PVERSION:
2858                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2859         case SNDRV_PCM_IOCTL_INFO:
2860                 return snd_pcm_info_user(substream, arg);
2861         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2862                 return 0;
2863         case SNDRV_PCM_IOCTL_TTSTAMP:
2864                 return snd_pcm_tstamp(substream, arg);
2865         case SNDRV_PCM_IOCTL_USER_PVERSION:
2866                 if (get_user(pcm_file->user_pversion,
2867                              (unsigned int __user *)arg))
2868                         return -EFAULT;
2869                 return 0;
2870         case SNDRV_PCM_IOCTL_HW_REFINE:
2871                 return snd_pcm_hw_refine_user(substream, arg);
2872         case SNDRV_PCM_IOCTL_HW_PARAMS:
2873                 return snd_pcm_hw_params_user(substream, arg);
2874         case SNDRV_PCM_IOCTL_HW_FREE:
2875                 return snd_pcm_hw_free(substream);
2876         case SNDRV_PCM_IOCTL_SW_PARAMS:
2877                 return snd_pcm_sw_params_user(substream, arg);
2878         case SNDRV_PCM_IOCTL_STATUS:
2879                 return snd_pcm_status_user(substream, arg, false);
2880         case SNDRV_PCM_IOCTL_STATUS_EXT:
2881                 return snd_pcm_status_user(substream, arg, true);
2882         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2883                 return snd_pcm_channel_info_user(substream, arg);
2884         case SNDRV_PCM_IOCTL_PREPARE:
2885                 return snd_pcm_prepare(substream, file);
2886         case SNDRV_PCM_IOCTL_RESET:
2887                 return snd_pcm_reset(substream);
2888         case SNDRV_PCM_IOCTL_START:
2889                 return snd_pcm_start_lock_irq(substream);
2890         case SNDRV_PCM_IOCTL_LINK:
2891                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2892         case SNDRV_PCM_IOCTL_UNLINK:
2893                 return snd_pcm_unlink(substream);
2894         case SNDRV_PCM_IOCTL_RESUME:
2895                 return snd_pcm_resume(substream);
2896         case SNDRV_PCM_IOCTL_XRUN:
2897                 return snd_pcm_xrun(substream);
2898         case SNDRV_PCM_IOCTL_HWSYNC:
2899                 return snd_pcm_hwsync(substream);
2900         case SNDRV_PCM_IOCTL_DELAY:
2901         {
2902                 snd_pcm_sframes_t delay;
2903                 snd_pcm_sframes_t __user *res = arg;
2904                 int err;
2905 
2906                 err = snd_pcm_delay(substream, &delay);
2907                 if (err)
2908                         return err;
2909                 if (put_user(delay, res))
2910                         return -EFAULT;
2911                 return 0;
2912         }
2913         case SNDRV_PCM_IOCTL_SYNC_PTR:
2914                 return snd_pcm_sync_ptr(substream, arg);
2915 #ifdef CONFIG_SND_SUPPORT_OLD_API
2916         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2917                 return snd_pcm_hw_refine_old_user(substream, arg);
2918         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2919                 return snd_pcm_hw_params_old_user(substream, arg);
2920 #endif
2921         case SNDRV_PCM_IOCTL_DRAIN:
2922                 return snd_pcm_drain(substream, file);
2923         case SNDRV_PCM_IOCTL_DROP:
2924                 return snd_pcm_drop(substream);
2925         case SNDRV_PCM_IOCTL_PAUSE:
2926                 return snd_pcm_action_lock_irq(&snd_pcm_action_pause,
2927                                                substream,
2928                                                (int)(unsigned long)arg);
2929         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2930         case SNDRV_PCM_IOCTL_READI_FRAMES:
2931                 return snd_pcm_xferi_frames_ioctl(substream, arg);
2932         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2933         case SNDRV_PCM_IOCTL_READN_FRAMES:
2934                 return snd_pcm_xfern_frames_ioctl(substream, arg);
2935         case SNDRV_PCM_IOCTL_REWIND:
2936                 return snd_pcm_rewind_ioctl(substream, arg);
2937         case SNDRV_PCM_IOCTL_FORWARD:
2938                 return snd_pcm_forward_ioctl(substream, arg);
2939         }
2940         pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2941         return -ENOTTY;
2942 }
2943 
2944 static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
2945                           unsigned long arg)
2946 {
2947         struct snd_pcm_file *pcm_file;
2948 
2949         pcm_file = file->private_data;
2950 
2951         if (((cmd >> 8) & 0xff) != 'A')
2952                 return -ENOTTY;
2953 
2954         return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
2955                                      (void __user *)arg);
2956 }
2957 
2958 /**
2959  * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
2960  * @substream: PCM substream
2961  * @cmd: IOCTL cmd
2962  * @arg: IOCTL argument
2963  *
2964  * The function is provided primarily for OSS layer and USB gadget drivers,
2965  * and it allows only the limited set of ioctls (hw_params, sw_params,
2966  * prepare, start, drain, drop, forward).
2967  */
2968 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2969                          unsigned int cmd, void *arg)
2970 {
2971         snd_pcm_uframes_t *frames = arg;
2972         snd_pcm_sframes_t result;
2973         
2974         switch (cmd) {
2975         case SNDRV_PCM_IOCTL_FORWARD:
2976         {
2977                 /* provided only for OSS; capture-only and no value returned */
2978                 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
2979                         return -EINVAL;
2980                 result = snd_pcm_forward(substream, *frames);
2981                 return result < 0 ? result : 0;
2982         }
2983         case SNDRV_PCM_IOCTL_HW_PARAMS:
2984                 return snd_pcm_hw_params(substream, arg);
2985         case SNDRV_PCM_IOCTL_SW_PARAMS:
2986                 return snd_pcm_sw_params(substream, arg);
2987         case SNDRV_PCM_IOCTL_PREPARE:
2988                 return snd_pcm_prepare(substream, NULL);
2989         case SNDRV_PCM_IOCTL_START:
2990                 return snd_pcm_start_lock_irq(substream);
2991         case SNDRV_PCM_IOCTL_DRAIN:
2992                 return snd_pcm_drain(substream, NULL);
2993         case SNDRV_PCM_IOCTL_DROP:
2994                 return snd_pcm_drop(substream);
2995         case SNDRV_PCM_IOCTL_DELAY:
2996                 return snd_pcm_delay(substream, frames);
2997         default:
2998                 return -EINVAL;
2999         }
3000 }
3001 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3002 
3003 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3004                             loff_t * offset)
3005 {
3006         struct snd_pcm_file *pcm_file;
3007         struct snd_pcm_substream *substream;
3008         struct snd_pcm_runtime *runtime;
3009         snd_pcm_sframes_t result;
3010 
3011         pcm_file = file->private_data;
3012         substream = pcm_file->substream;
3013         if (PCM_RUNTIME_CHECK(substream))
3014                 return -ENXIO;
3015         runtime = substream->runtime;
3016         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3017                 return -EBADFD;
3018         if (!frame_aligned(runtime, count))
3019                 return -EINVAL;
3020         count = bytes_to_frames(runtime, count);
3021         result = snd_pcm_lib_read(substream, buf, count);
3022         if (result > 0)
3023                 result = frames_to_bytes(runtime, result);
3024         return result;
3025 }
3026 
3027 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3028                              size_t count, loff_t * offset)
3029 {
3030         struct snd_pcm_file *pcm_file;
3031         struct snd_pcm_substream *substream;
3032         struct snd_pcm_runtime *runtime;
3033         snd_pcm_sframes_t result;
3034 
3035         pcm_file = file->private_data;
3036         substream = pcm_file->substream;
3037         if (PCM_RUNTIME_CHECK(substream))
3038                 return -ENXIO;
3039         runtime = substream->runtime;
3040         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3041                 return -EBADFD;
3042         if (!frame_aligned(runtime, count))
3043                 return -EINVAL;
3044         count = bytes_to_frames(runtime, count);
3045         result = snd_pcm_lib_write(substream, buf, count);
3046         if (result > 0)
3047                 result = frames_to_bytes(runtime, result);
3048         return result;
3049 }
3050 
3051 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3052 {
3053         struct snd_pcm_file *pcm_file;
3054         struct snd_pcm_substream *substream;
3055         struct snd_pcm_runtime *runtime;
3056         snd_pcm_sframes_t result;
3057         unsigned long i;
3058         void __user **bufs;
3059         snd_pcm_uframes_t frames;
3060 
3061         pcm_file = iocb->ki_filp->private_data;
3062         substream = pcm_file->substream;
3063         if (PCM_RUNTIME_CHECK(substream))
3064                 return -ENXIO;
3065         runtime = substream->runtime;
3066         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3067                 return -EBADFD;
3068         if (!iter_is_iovec(to))
3069                 return -EINVAL;
3070         if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3071                 return -EINVAL;
3072         if (!frame_aligned(runtime, to->iov->iov_len))
3073                 return -EINVAL;
3074         frames = bytes_to_samples(runtime, to->iov->iov_len);
3075         bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL);
3076         if (bufs == NULL)
3077                 return -ENOMEM;
3078         for (i = 0; i < to->nr_segs; ++i)
3079                 bufs[i] = to->iov[i].iov_base;
3080         result = snd_pcm_lib_readv(substream, bufs, frames);
3081         if (result > 0)
3082                 result = frames_to_bytes(runtime, result);
3083         kfree(bufs);
3084         return result;
3085 }
3086 
3087 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3088 {
3089         struct snd_pcm_file *pcm_file;
3090         struct snd_pcm_substream *substream;
3091         struct snd_pcm_runtime *runtime;
3092         snd_pcm_sframes_t result;
3093         unsigned long i;
3094         void __user **bufs;
3095         snd_pcm_uframes_t frames;
3096 
3097         pcm_file = iocb->ki_filp->private_data;
3098         substream = pcm_file->substream;
3099         if (PCM_RUNTIME_CHECK(substream))
3100                 return -ENXIO;
3101         runtime = substream->runtime;
3102         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3103                 return -EBADFD;
3104         if (!iter_is_iovec(from))
3105                 return -EINVAL;
3106         if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3107             !frame_aligned(runtime, from->iov->iov_len))
3108                 return -EINVAL;
3109         frames = bytes_to_samples(runtime, from->iov->iov_len);
3110         bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL);
3111         if (bufs == NULL)
3112                 return -ENOMEM;
3113         for (i = 0; i < from->nr_segs; ++i)
3114                 bufs[i] = from->iov[i].iov_base;
3115         result = snd_pcm_lib_writev(substream, bufs, frames);
3116         if (result > 0)
3117                 result = frames_to_bytes(runtime, result);
3118         kfree(bufs);
3119         return result;
3120 }
3121 
3122 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
3123 {
3124         struct snd_pcm_file *pcm_file;
3125         struct snd_pcm_substream *substream;
3126         struct snd_pcm_runtime *runtime;
3127         __poll_t mask, ok;
3128         snd_pcm_uframes_t avail;
3129 
3130         pcm_file = file->private_data;
3131 
3132         substream = pcm_file->substream;
3133         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3134                 ok = EPOLLOUT | EPOLLWRNORM;
3135         else
3136                 ok = EPOLLIN | EPOLLRDNORM;
3137         if (PCM_RUNTIME_CHECK(substream))
3138                 return ok | EPOLLERR;
3139 
3140         runtime = substream->runtime;
3141         poll_wait(file, &runtime->sleep, wait);
3142 
3143         mask = 0;
3144         snd_pcm_stream_lock_irq(substream);
3145         avail = snd_pcm_avail(substream);
3146         switch (runtime->status->state) {
3147         case SNDRV_PCM_STATE_RUNNING:
3148         case SNDRV_PCM_STATE_PREPARED:
3149         case SNDRV_PCM_STATE_PAUSED:
3150                 if (avail >= runtime->control->avail_min)
3151                         mask = ok;
3152                 break;
3153         case SNDRV_PCM_STATE_DRAINING:
3154                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
3155                         mask = ok;
3156                         if (!avail)
3157                                 mask |= EPOLLERR;
3158                 }
3159                 break;
3160         default:
3161                 mask = ok | EPOLLERR;
3162                 break;
3163         }
3164         snd_pcm_stream_unlock_irq(substream);
3165         return mask;
3166 }
3167 
3168 /*
3169  * mmap support
3170  */
3171 
3172 /*
3173  * Only on coherent architectures, we can mmap the status and the control records
3174  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3175  */
3176 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3177 /*
3178  * mmap status record
3179  */
3180 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3181 {
3182         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3183         struct snd_pcm_runtime *runtime;
3184         
3185         if (substream == NULL)
3186                 return VM_FAULT_SIGBUS;
3187         runtime = substream->runtime;
3188         vmf->page = virt_to_page(runtime->status);
3189         get_page(vmf->page);
3190         return 0;
3191 }
3192 
3193 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3194 {
3195         .fault =        snd_pcm_mmap_status_fault,
3196 };
3197 
3198 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3199                                struct vm_area_struct *area)
3200 {
3201         long size;
3202         if (!(area->vm_flags & VM_READ))
3203                 return -EINVAL;
3204         size = area->vm_end - area->vm_start;
3205         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3206                 return -EINVAL;
3207         area->vm_ops = &snd_pcm_vm_ops_status;
3208         area->vm_private_data = substream;
3209         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3210         return 0;
3211 }
3212 
3213 /*
3214  * mmap control record
3215  */
3216 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3217 {
3218         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3219         struct snd_pcm_runtime *runtime;
3220         
3221         if (substream == NULL)
3222                 return VM_FAULT_SIGBUS;
3223         runtime = substream->runtime;
3224         vmf->page = virt_to_page(runtime->control);
3225         get_page(vmf->page);
3226         return 0;
3227 }
3228 
3229 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3230 {
3231         .fault =        snd_pcm_mmap_control_fault,
3232 };
3233 
3234 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3235                                 struct vm_area_struct *area)
3236 {
3237         long size;
3238         if (!(area->vm_flags & VM_READ))
3239                 return -EINVAL;
3240         size = area->vm_end - area->vm_start;
3241         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3242                 return -EINVAL;
3243         area->vm_ops = &snd_pcm_vm_ops_control;
3244         area->vm_private_data = substream;
3245         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3246         return 0;
3247 }
3248 
3249 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3250 {
3251         if (pcm_file->no_compat_mmap)
3252                 return false;
3253         /* See pcm_control_mmap_allowed() below.
3254          * Since older alsa-lib requires both status and control mmaps to be
3255          * coupled, we have to disable the status mmap for old alsa-lib, too.
3256          */
3257         if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3258             (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3259                 return false;
3260         return true;
3261 }
3262 
3263 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3264 {
3265         if (pcm_file->no_compat_mmap)
3266                 return false;
3267         /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3268          * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3269          * thus it effectively assures the manual update of appl_ptr.
3270          */
3271         if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3272                 return false;
3273         return true;
3274 }
3275 
3276 #else /* ! coherent mmap */
3277 /*
3278  * don't support mmap for status and control records.
3279  */
3280 #define pcm_status_mmap_allowed(pcm_file)       false
3281 #define pcm_control_mmap_allowed(pcm_file)      false
3282 
3283 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3284                                struct vm_area_struct *area)
3285 {
3286         return -ENXIO;
3287 }
3288 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3289                                 struct vm_area_struct *area)
3290 {
3291         return -ENXIO;
3292 }
3293 #endif /* coherent mmap */
3294 
3295 static inline struct page *
3296 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3297 {
3298         void *vaddr = substream->runtime->dma_area + ofs;
3299         return virt_to_page(vaddr);
3300 }
3301 
3302 /*
3303  * fault callback for mmapping a RAM page
3304  */
3305 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3306 {
3307         struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3308         struct snd_pcm_runtime *runtime;
3309         unsigned long offset;
3310         struct page * page;
3311         size_t dma_bytes;
3312         
3313         if (substream == NULL)
3314                 return VM_FAULT_SIGBUS;
3315         runtime = substream->runtime;
3316         offset = vmf->pgoff << PAGE_SHIFT;
3317         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3318         if (offset > dma_bytes - PAGE_SIZE)
3319                 return VM_FAULT_SIGBUS;
3320         if (substream->ops->page)
3321                 page = substream->ops->page(substream, offset);
3322         else
3323                 page = snd_pcm_default_page_ops(substream, offset);
3324         if (!page)
3325                 return VM_FAULT_SIGBUS;
3326         get_page(page);
3327         vmf->page = page;
3328         return 0;
3329 }
3330 
3331 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3332         .open =         snd_pcm_mmap_data_open,
3333         .close =        snd_pcm_mmap_data_close,
3334 };
3335 
3336 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3337         .open =         snd_pcm_mmap_data_open,
3338         .close =        snd_pcm_mmap_data_close,
3339         .fault =        snd_pcm_mmap_data_fault,
3340 };
3341 
3342 /*
3343  * mmap the DMA buffer on RAM
3344  */
3345 
3346 /**
3347  * snd_pcm_lib_default_mmap - Default PCM data mmap function
3348  * @substream: PCM substream
3349  * @area: VMA
3350  *
3351  * This is the default mmap handler for PCM data.  When mmap pcm_ops is NULL,
3352  * this function is invoked implicitly.
3353  */
3354 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3355                              struct vm_area_struct *area)
3356 {
3357         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3358 #ifdef CONFIG_GENERIC_ALLOCATOR
3359         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3360                 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3361                 return remap_pfn_range(area, area->vm_start,
3362                                 substream->dma_buffer.addr >> PAGE_SHIFT,
3363                                 area->vm_end - area->vm_start, area->vm_page_prot);
3364         }
3365 #endif /* CONFIG_GENERIC_ALLOCATOR */
3366 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
3367         if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page &&
3368             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3369                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3370                                          area,
3371                                          substream->runtime->dma_area,
3372                                          substream->runtime->dma_addr,
3373                                          substream->runtime->dma_bytes);
3374 #endif /* CONFIG_X86 */
3375         /* mmap with fault handler */
3376         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3377         return 0;
3378 }
3379 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3380 
3381 /*
3382  * mmap the DMA buffer on I/O memory area
3383  */
3384 #if SNDRV_PCM_INFO_MMAP_IOMEM
3385 /**
3386  * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3387  * @substream: PCM substream
3388  * @area: VMA
3389  *
3390  * When your hardware uses the iomapped pages as the hardware buffer and
3391  * wants to mmap it, pass this function as mmap pcm_ops.  Note that this
3392  * is supposed to work only on limited architectures.
3393  */
3394 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3395                            struct vm_area_struct *area)
3396 {
3397         struct snd_pcm_runtime *runtime = substream->runtime;
3398 
3399         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3400         return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3401 }
3402 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3403 #endif /* SNDRV_PCM_INFO_MMAP */
3404 
3405 /*
3406  * mmap DMA buffer
3407  */
3408 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3409                       struct vm_area_struct *area)
3410 {
3411         struct snd_pcm_runtime *runtime;
3412         long size;
3413         unsigned long offset;
3414         size_t dma_bytes;
3415         int err;
3416 
3417         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3418                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3419                         return -EINVAL;
3420         } else {
3421                 if (!(area->vm_flags & VM_READ))
3422                         return -EINVAL;
3423         }
3424         runtime = substream->runtime;
3425         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3426                 return -EBADFD;
3427         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3428                 return -ENXIO;
3429         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3430             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3431                 return -EINVAL;
3432         size = area->vm_end - area->vm_start;
3433         offset = area->vm_pgoff << PAGE_SHIFT;
3434         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3435         if ((size_t)size > dma_bytes)
3436                 return -EINVAL;
3437         if (offset > dma_bytes - size)
3438                 return -EINVAL;
3439 
3440         area->vm_ops = &snd_pcm_vm_ops_data;
3441         area->vm_private_data = substream;
3442         if (substream->ops->mmap)
3443                 err = substream->ops->mmap(substream, area);
3444         else
3445                 err = snd_pcm_lib_default_mmap(substream, area);
3446         if (!err)
3447                 atomic_inc(&substream->mmap_count);
3448         return err;
3449 }
3450 EXPORT_SYMBOL(snd_pcm_mmap_data);
3451 
3452 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3453 {
3454         struct snd_pcm_file * pcm_file;
3455         struct snd_pcm_substream *substream;    
3456         unsigned long offset;
3457         
3458         pcm_file = file->private_data;
3459         substream = pcm_file->substream;
3460         if (PCM_RUNTIME_CHECK(substream))
3461                 return -ENXIO;
3462 
3463         offset = area->vm_pgoff << PAGE_SHIFT;
3464         switch (offset) {
3465         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3466                 if (!pcm_status_mmap_allowed(pcm_file))
3467                         return -ENXIO;
3468                 return snd_pcm_mmap_status(substream, file, area);
3469         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3470                 if (!pcm_control_mmap_allowed(pcm_file))
3471                         return -ENXIO;
3472                 return snd_pcm_mmap_control(substream, file, area);
3473         default:
3474                 return snd_pcm_mmap_data(substream, file, area);
3475         }
3476         return 0;
3477 }
3478 
3479 static int snd_pcm_fasync(int fd, struct file * file, int on)
3480 {
3481         struct snd_pcm_file * pcm_file;
3482         struct snd_pcm_substream *substream;
3483         struct snd_pcm_runtime *runtime;
3484 
3485         pcm_file = file->private_data;
3486         substream = pcm_file->substream;
3487         if (PCM_RUNTIME_CHECK(substream))
3488                 return -ENXIO;
3489         runtime = substream->runtime;
3490         return fasync_helper(fd, file, on, &runtime->fasync);
3491 }
3492 
3493 /*
3494  * ioctl32 compat
3495  */
3496 #ifdef CONFIG_COMPAT
3497 #include "pcm_compat.c"
3498 #else
3499 #define snd_pcm_ioctl_compat    NULL
3500 #endif
3501 
3502 /*
3503  *  To be removed helpers to keep binary compatibility
3504  */
3505 
3506 #ifdef CONFIG_SND_SUPPORT_OLD_API
3507 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3508 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3509 
3510 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3511                                                struct snd_pcm_hw_params_old *oparams)
3512 {
3513         unsigned int i;
3514 
3515         memset(params, 0, sizeof(*params));
3516         params->flags = oparams->flags;
3517         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3518                 params->masks[i].bits[0] = oparams->masks[i];
3519         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3520         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3521         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3522         params->info = oparams->info;
3523         params->msbits = oparams->msbits;
3524         params->rate_num = oparams->rate_num;
3525         params->rate_den = oparams->rate_den;
3526         params->fifo_size = oparams->fifo_size;
3527 }
3528 
3529 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3530                                              struct snd_pcm_hw_params *params)
3531 {
3532         unsigned int i;
3533 
3534         memset(oparams, 0, sizeof(*oparams));
3535         oparams->flags = params->flags;
3536         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3537                 oparams->masks[i] = params->masks[i].bits[0];
3538         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3539         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3540         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3541         oparams->info = params->info;
3542         oparams->msbits = params->msbits;
3543         oparams->rate_num = params->rate_num;
3544         oparams->rate_den = params->rate_den;
3545         oparams->fifo_size = params->fifo_size;
3546 }
3547 
3548 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3549                                       struct snd_pcm_hw_params_old __user * _oparams)
3550 {
3551         struct snd_pcm_hw_params *params;
3552         struct snd_pcm_hw_params_old *oparams = NULL;
3553         int err;
3554 
3555         params = kmalloc(sizeof(*params), GFP_KERNEL);
3556         if (!params)
3557                 return -ENOMEM;
3558 
3559         oparams = memdup_user(_oparams, sizeof(*oparams));
3560         if (IS_ERR(oparams)) {
3561                 err = PTR_ERR(oparams);
3562                 goto out;
3563         }
3564         snd_pcm_hw_convert_from_old_params(params, oparams);
3565         err = snd_pcm_hw_refine(substream, params);
3566         if (err < 0)
3567                 goto out_old;
3568 
3569         err = fixup_unreferenced_params(substream, params);
3570         if (err < 0)
3571                 goto out_old;
3572 
3573         snd_pcm_hw_convert_to_old_params(oparams, params);
3574         if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3575                 err = -EFAULT;
3576 out_old:
3577         kfree(oparams);
3578 out:
3579         kfree(params);
3580         return err;
3581 }
3582 
3583 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3584                                       struct snd_pcm_hw_params_old __user * _oparams)
3585 {
3586         struct snd_pcm_hw_params *params;
3587         struct snd_pcm_hw_params_old *oparams = NULL;
3588         int err;
3589 
3590         params = kmalloc(sizeof(*params), GFP_KERNEL);
3591         if (!params)
3592                 return -ENOMEM;
3593 
3594         oparams = memdup_user(_oparams, sizeof(*oparams));
3595         if (IS_ERR(oparams)) {
3596                 err = PTR_ERR(oparams);
3597                 goto out;
3598         }
3599 
3600         snd_pcm_hw_convert_from_old_params(params, oparams);
3601         err = snd_pcm_hw_params(substream, params);
3602         if (err < 0)
3603                 goto out_old;
3604 
3605         snd_pcm_hw_convert_to_old_params(oparams, params);
3606         if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3607                 err = -EFAULT;
3608 out_old:
3609         kfree(oparams);
3610 out:
3611         kfree(params);
3612         return err;
3613 }
3614 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3615 
3616 #ifndef CONFIG_MMU
3617 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3618                                                unsigned long addr,
3619                                                unsigned long len,
3620                                                unsigned long pgoff,
3621                                                unsigned long flags)
3622 {
3623         struct snd_pcm_file *pcm_file = file->private_data;
3624         struct snd_pcm_substream *substream = pcm_file->substream;
3625         struct snd_pcm_runtime *runtime = substream->runtime;
3626         unsigned long offset = pgoff << PAGE_SHIFT;
3627 
3628         switch (offset) {
3629         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3630                 return (unsigned long)runtime->status;
3631         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3632                 return (unsigned long)runtime->control;
3633         default:
3634                 return (unsigned long)runtime->dma_area + offset;
3635         }
3636 }
3637 #else
3638 # define snd_pcm_get_unmapped_area NULL
3639 #endif
3640 
3641 /*
3642  *  Register section
3643  */
3644 
3645 const struct file_operations snd_pcm_f_ops[2] = {
3646         {
3647                 .owner =                THIS_MODULE,
3648                 .write =                snd_pcm_write,
3649                 .write_iter =           snd_pcm_writev,
3650                 .open =                 snd_pcm_playback_open,
3651                 .release =              snd_pcm_release,
3652                 .llseek =               no_llseek,
3653                 .poll =                 snd_pcm_poll,
3654                 .unlocked_ioctl =       snd_pcm_ioctl,
3655                 .compat_ioctl =         snd_pcm_ioctl_compat,
3656                 .mmap =                 snd_pcm_mmap,
3657                 .fasync =               snd_pcm_fasync,
3658                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3659         },
3660         {
3661                 .owner =                THIS_MODULE,
3662                 .read =                 snd_pcm_read,
3663                 .read_iter =            snd_pcm_readv,
3664                 .open =                 snd_pcm_capture_open,
3665                 .release =              snd_pcm_release,
3666                 .llseek =               no_llseek,
3667                 .poll =                 snd_pcm_poll,
3668                 .unlocked_ioctl =       snd_pcm_ioctl,
3669                 .compat_ioctl =         snd_pcm_ioctl_compat,
3670                 .mmap =                 snd_pcm_mmap,
3671                 .fasync =               snd_pcm_fasync,
3672                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3673         }
3674 };
3675 

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