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

Version: ~ [ linux-5.12-rc7 ] ~ [ linux-5.11.13 ] ~ [ linux-5.10.29 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.111 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.186 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.230 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.266 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.266 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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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/time.h>
 27 #include <linux/pm_qos.h>
 28 #include <linux/aio.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 
 39 /*
 40  *  Compatibility
 41  */
 42 
 43 struct snd_pcm_hw_params_old {
 44         unsigned int flags;
 45         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
 46                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
 47         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
 48                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
 49         unsigned int rmask;
 50         unsigned int cmask;
 51         unsigned int info;
 52         unsigned int msbits;
 53         unsigned int rate_num;
 54         unsigned int rate_den;
 55         snd_pcm_uframes_t fifo_size;
 56         unsigned char reserved[64];
 57 };
 58 
 59 #ifdef CONFIG_SND_SUPPORT_OLD_API
 60 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
 61 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
 62 
 63 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
 64                                       struct snd_pcm_hw_params_old __user * _oparams);
 65 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
 66                                       struct snd_pcm_hw_params_old __user * _oparams);
 67 #endif
 68 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
 69 
 70 /*
 71  *
 72  */
 73 
 74 static DEFINE_RWLOCK(snd_pcm_link_rwlock);
 75 static DECLARE_RWSEM(snd_pcm_link_rwsem);
 76 
 77 /**
 78  * snd_pcm_stream_lock - Lock the PCM stream
 79  * @substream: PCM substream
 80  *
 81  * This locks the PCM stream's spinlock or mutex depending on the nonatomic
 82  * flag of the given substream.  This also takes the global link rw lock
 83  * (or rw sem), too, for avoiding the race with linked streams.
 84  */
 85 void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
 86 {
 87         if (substream->pcm->nonatomic) {
 88                 down_read(&snd_pcm_link_rwsem);
 89                 mutex_lock(&substream->self_group.mutex);
 90         } else {
 91                 read_lock(&snd_pcm_link_rwlock);
 92                 spin_lock(&substream->self_group.lock);
 93         }
 94 }
 95 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
 96 
 97 /**
 98  * snd_pcm_stream_lock - Unlock the PCM stream
 99  * @substream: PCM substream
100  *
101  * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
102  */
103 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
104 {
105         if (substream->pcm->nonatomic) {
106                 mutex_unlock(&substream->self_group.mutex);
107                 up_read(&snd_pcm_link_rwsem);
108         } else {
109                 spin_unlock(&substream->self_group.lock);
110                 read_unlock(&snd_pcm_link_rwlock);
111         }
112 }
113 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
114 
115 /**
116  * snd_pcm_stream_lock_irq - Lock the PCM stream
117  * @substream: PCM substream
118  *
119  * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
120  * IRQ (only when nonatomic is false).  In nonatomic case, this is identical
121  * as snd_pcm_stream_lock().
122  */
123 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
124 {
125         if (!substream->pcm->nonatomic)
126                 local_irq_disable();
127         snd_pcm_stream_lock(substream);
128 }
129 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
130 
131 /**
132  * snd_pcm_stream_unlock_irq - Unlock the PCM stream
133  * @substream: PCM substream
134  *
135  * This is a counter-part of snd_pcm_stream_lock_irq().
136  */
137 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
138 {
139         snd_pcm_stream_unlock(substream);
140         if (!substream->pcm->nonatomic)
141                 local_irq_enable();
142 }
143 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
144 
145 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
146 {
147         unsigned long flags = 0;
148         if (!substream->pcm->nonatomic)
149                 local_irq_save(flags);
150         snd_pcm_stream_lock(substream);
151         return flags;
152 }
153 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
154 
155 /**
156  * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
157  * @substream: PCM substream
158  * @flags: irq flags
159  *
160  * This is a counter-part of snd_pcm_stream_lock_irqsave().
161  */
162 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
163                                       unsigned long flags)
164 {
165         snd_pcm_stream_unlock(substream);
166         if (!substream->pcm->nonatomic)
167                 local_irq_restore(flags);
168 }
169 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
170 
171 static inline mm_segment_t snd_enter_user(void)
172 {
173         mm_segment_t fs = get_fs();
174         set_fs(get_ds());
175         return fs;
176 }
177 
178 static inline void snd_leave_user(mm_segment_t fs)
179 {
180         set_fs(fs);
181 }
182 
183 
184 
185 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
186 {
187         struct snd_pcm_runtime *runtime;
188         struct snd_pcm *pcm = substream->pcm;
189         struct snd_pcm_str *pstr = substream->pstr;
190 
191         memset(info, 0, sizeof(*info));
192         info->card = pcm->card->number;
193         info->device = pcm->device;
194         info->stream = substream->stream;
195         info->subdevice = substream->number;
196         strlcpy(info->id, pcm->id, sizeof(info->id));
197         strlcpy(info->name, pcm->name, sizeof(info->name));
198         info->dev_class = pcm->dev_class;
199         info->dev_subclass = pcm->dev_subclass;
200         info->subdevices_count = pstr->substream_count;
201         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
202         strlcpy(info->subname, substream->name, sizeof(info->subname));
203         runtime = substream->runtime;
204         /* AB: FIXME!!! This is definitely nonsense */
205         if (runtime) {
206                 info->sync = runtime->sync;
207                 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
208         }
209         return 0;
210 }
211 
212 int snd_pcm_info_user(struct snd_pcm_substream *substream,
213                       struct snd_pcm_info __user * _info)
214 {
215         struct snd_pcm_info *info;
216         int err;
217 
218         info = kmalloc(sizeof(*info), GFP_KERNEL);
219         if (! info)
220                 return -ENOMEM;
221         err = snd_pcm_info(substream, info);
222         if (err >= 0) {
223                 if (copy_to_user(_info, info, sizeof(*info)))
224                         err = -EFAULT;
225         }
226         kfree(info);
227         return err;
228 }
229 
230 static bool hw_support_mmap(struct snd_pcm_substream *substream)
231 {
232         if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
233                 return false;
234         /* check architectures that return -EINVAL from dma_mmap_coherent() */
235         /* FIXME: this should be some global flag */
236 #if defined(CONFIG_C6X) || defined(CONFIG_FRV) || defined(CONFIG_MN10300) ||\
237         defined(CONFIG_PARISC) || defined(CONFIG_XTENSA)
238         if (!substream->ops->mmap &&
239             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
240                 return false;
241 #endif
242         return true;
243 }
244 
245 #undef RULES_DEBUG
246 
247 #ifdef RULES_DEBUG
248 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
249 static const char * const snd_pcm_hw_param_names[] = {
250         HW_PARAM(ACCESS),
251         HW_PARAM(FORMAT),
252         HW_PARAM(SUBFORMAT),
253         HW_PARAM(SAMPLE_BITS),
254         HW_PARAM(FRAME_BITS),
255         HW_PARAM(CHANNELS),
256         HW_PARAM(RATE),
257         HW_PARAM(PERIOD_TIME),
258         HW_PARAM(PERIOD_SIZE),
259         HW_PARAM(PERIOD_BYTES),
260         HW_PARAM(PERIODS),
261         HW_PARAM(BUFFER_TIME),
262         HW_PARAM(BUFFER_SIZE),
263         HW_PARAM(BUFFER_BYTES),
264         HW_PARAM(TICK_TIME),
265 };
266 #endif
267 
268 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 
269                       struct snd_pcm_hw_params *params)
270 {
271         unsigned int k;
272         struct snd_pcm_hardware *hw;
273         struct snd_interval *i = NULL;
274         struct snd_mask *m = NULL;
275         struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
276         unsigned int rstamps[constrs->rules_num];
277         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
278         unsigned int stamp = 2;
279         int changed, again;
280 
281         params->info = 0;
282         params->fifo_size = 0;
283         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
284                 params->msbits = 0;
285         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
286                 params->rate_num = 0;
287                 params->rate_den = 0;
288         }
289 
290         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
291                 m = hw_param_mask(params, k);
292                 if (snd_mask_empty(m))
293                         return -EINVAL;
294                 if (!(params->rmask & (1 << k)))
295                         continue;
296 #ifdef RULES_DEBUG
297                 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
298                 pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
299 #endif
300                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
301 #ifdef RULES_DEBUG
302                 pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
303 #endif
304                 if (changed)
305                         params->cmask |= 1 << k;
306                 if (changed < 0)
307                         return changed;
308         }
309 
310         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
311                 i = hw_param_interval(params, k);
312                 if (snd_interval_empty(i))
313                         return -EINVAL;
314                 if (!(params->rmask & (1 << k)))
315                         continue;
316 #ifdef RULES_DEBUG
317                 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
318                 if (i->empty)
319                         pr_cont("empty");
320                 else
321                         pr_cont("%c%u %u%c",
322                                i->openmin ? '(' : '[', i->min,
323                                i->max, i->openmax ? ')' : ']');
324                 pr_cont(" -> ");
325 #endif
326                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
327 #ifdef RULES_DEBUG
328                 if (i->empty)
329                         pr_cont("empty\n");
330                 else 
331                         pr_cont("%c%u %u%c\n",
332                                i->openmin ? '(' : '[', i->min,
333                                i->max, i->openmax ? ')' : ']');
334 #endif
335                 if (changed)
336                         params->cmask |= 1 << k;
337                 if (changed < 0)
338                         return changed;
339         }
340 
341         for (k = 0; k < constrs->rules_num; k++)
342                 rstamps[k] = 0;
343         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 
344                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
345         do {
346                 again = 0;
347                 for (k = 0; k < constrs->rules_num; k++) {
348                         struct snd_pcm_hw_rule *r = &constrs->rules[k];
349                         unsigned int d;
350                         int doit = 0;
351                         if (r->cond && !(r->cond & params->flags))
352                                 continue;
353                         for (d = 0; r->deps[d] >= 0; d++) {
354                                 if (vstamps[r->deps[d]] > rstamps[k]) {
355                                         doit = 1;
356                                         break;
357                                 }
358                         }
359                         if (!doit)
360                                 continue;
361 #ifdef RULES_DEBUG
362                         pr_debug("Rule %d [%p]: ", k, r->func);
363                         if (r->var >= 0) {
364                                 pr_cont("%s = ", snd_pcm_hw_param_names[r->var]);
365                                 if (hw_is_mask(r->var)) {
366                                         m = hw_param_mask(params, r->var);
367                                         pr_cont("%x", *m->bits);
368                                 } else {
369                                         i = hw_param_interval(params, r->var);
370                                         if (i->empty)
371                                                 pr_cont("empty");
372                                         else
373                                                 pr_cont("%c%u %u%c",
374                                                        i->openmin ? '(' : '[', i->min,
375                                                        i->max, i->openmax ? ')' : ']');
376                                 }
377                         }
378 #endif
379                         changed = r->func(params, r);
380 #ifdef RULES_DEBUG
381                         if (r->var >= 0) {
382                                 pr_cont(" -> ");
383                                 if (hw_is_mask(r->var))
384                                         pr_cont("%x", *m->bits);
385                                 else {
386                                         if (i->empty)
387                                                 pr_cont("empty");
388                                         else
389                                                 pr_cont("%c%u %u%c",
390                                                        i->openmin ? '(' : '[', i->min,
391                                                        i->max, i->openmax ? ')' : ']');
392                                 }
393                         }
394                         pr_cont("\n");
395 #endif
396                         rstamps[k] = stamp;
397                         if (changed && r->var >= 0) {
398                                 params->cmask |= (1 << r->var);
399                                 vstamps[r->var] = stamp;
400                                 again = 1;
401                         }
402                         if (changed < 0)
403                                 return changed;
404                         stamp++;
405                 }
406         } while (again);
407         if (!params->msbits) {
408                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
409                 if (snd_interval_single(i))
410                         params->msbits = snd_interval_value(i);
411         }
412 
413         if (!params->rate_den) {
414                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
415                 if (snd_interval_single(i)) {
416                         params->rate_num = snd_interval_value(i);
417                         params->rate_den = 1;
418                 }
419         }
420 
421         hw = &substream->runtime->hw;
422         if (!params->info) {
423                 params->info = hw->info & ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
424                                             SNDRV_PCM_INFO_DRAIN_TRIGGER);
425                 if (!hw_support_mmap(substream))
426                         params->info &= ~(SNDRV_PCM_INFO_MMAP |
427                                           SNDRV_PCM_INFO_MMAP_VALID);
428         }
429         if (!params->fifo_size) {
430                 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
431                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
432                 if (snd_mask_min(m) == snd_mask_max(m) &&
433                     snd_interval_min(i) == snd_interval_max(i)) {
434                         changed = substream->ops->ioctl(substream,
435                                         SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
436                         if (changed < 0)
437                                 return changed;
438                 }
439         }
440         params->rmask = 0;
441         return 0;
442 }
443 
444 EXPORT_SYMBOL(snd_pcm_hw_refine);
445 
446 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
447                                   struct snd_pcm_hw_params __user * _params)
448 {
449         struct snd_pcm_hw_params *params;
450         int err;
451 
452         params = memdup_user(_params, sizeof(*params));
453         if (IS_ERR(params))
454                 return PTR_ERR(params);
455 
456         err = snd_pcm_hw_refine(substream, params);
457         if (copy_to_user(_params, params, sizeof(*params))) {
458                 if (!err)
459                         err = -EFAULT;
460         }
461 
462         kfree(params);
463         return err;
464 }
465 
466 static int period_to_usecs(struct snd_pcm_runtime *runtime)
467 {
468         int usecs;
469 
470         if (! runtime->rate)
471                 return -1; /* invalid */
472 
473         /* take 75% of period time as the deadline */
474         usecs = (750000 / runtime->rate) * runtime->period_size;
475         usecs += ((750000 % runtime->rate) * runtime->period_size) /
476                 runtime->rate;
477 
478         return usecs;
479 }
480 
481 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
482 {
483         snd_pcm_stream_lock_irq(substream);
484         if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
485                 substream->runtime->status->state = state;
486         snd_pcm_stream_unlock_irq(substream);
487 }
488 
489 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
490                              struct snd_pcm_hw_params *params)
491 {
492         struct snd_pcm_runtime *runtime;
493         int err, usecs;
494         unsigned int bits;
495         snd_pcm_uframes_t frames;
496 
497         if (PCM_RUNTIME_CHECK(substream))
498                 return -ENXIO;
499         runtime = substream->runtime;
500         snd_pcm_stream_lock_irq(substream);
501         switch (runtime->status->state) {
502         case SNDRV_PCM_STATE_OPEN:
503         case SNDRV_PCM_STATE_SETUP:
504         case SNDRV_PCM_STATE_PREPARED:
505                 break;
506         default:
507                 snd_pcm_stream_unlock_irq(substream);
508                 return -EBADFD;
509         }
510         snd_pcm_stream_unlock_irq(substream);
511 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
512         if (!substream->oss.oss)
513 #endif
514                 if (atomic_read(&substream->mmap_count))
515                         return -EBADFD;
516 
517         params->rmask = ~0U;
518         err = snd_pcm_hw_refine(substream, params);
519         if (err < 0)
520                 goto _error;
521 
522         err = snd_pcm_hw_params_choose(substream, params);
523         if (err < 0)
524                 goto _error;
525 
526         if (substream->ops->hw_params != NULL) {
527                 err = substream->ops->hw_params(substream, params);
528                 if (err < 0)
529                         goto _error;
530         }
531 
532         runtime->access = params_access(params);
533         runtime->format = params_format(params);
534         runtime->subformat = params_subformat(params);
535         runtime->channels = params_channels(params);
536         runtime->rate = params_rate(params);
537         runtime->period_size = params_period_size(params);
538         runtime->periods = params_periods(params);
539         runtime->buffer_size = params_buffer_size(params);
540         runtime->info = params->info;
541         runtime->rate_num = params->rate_num;
542         runtime->rate_den = params->rate_den;
543         runtime->no_period_wakeup =
544                         (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
545                         (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
546 
547         bits = snd_pcm_format_physical_width(runtime->format);
548         runtime->sample_bits = bits;
549         bits *= runtime->channels;
550         runtime->frame_bits = bits;
551         frames = 1;
552         while (bits % 8 != 0) {
553                 bits *= 2;
554                 frames *= 2;
555         }
556         runtime->byte_align = bits / 8;
557         runtime->min_align = frames;
558 
559         /* Default sw params */
560         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
561         runtime->period_step = 1;
562         runtime->control->avail_min = runtime->period_size;
563         runtime->start_threshold = 1;
564         runtime->stop_threshold = runtime->buffer_size;
565         runtime->silence_threshold = 0;
566         runtime->silence_size = 0;
567         runtime->boundary = runtime->buffer_size;
568         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
569                 runtime->boundary *= 2;
570 
571         snd_pcm_timer_resolution_change(substream);
572         snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
573 
574         if (pm_qos_request_active(&substream->latency_pm_qos_req))
575                 pm_qos_remove_request(&substream->latency_pm_qos_req);
576         if ((usecs = period_to_usecs(runtime)) >= 0)
577                 pm_qos_add_request(&substream->latency_pm_qos_req,
578                                    PM_QOS_CPU_DMA_LATENCY, usecs);
579         return 0;
580  _error:
581         /* hardware might be unusable from this time,
582            so we force application to retry to set
583            the correct hardware parameter settings */
584         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
585         if (substream->ops->hw_free != NULL)
586                 substream->ops->hw_free(substream);
587         return err;
588 }
589 
590 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
591                                   struct snd_pcm_hw_params __user * _params)
592 {
593         struct snd_pcm_hw_params *params;
594         int err;
595 
596         params = memdup_user(_params, sizeof(*params));
597         if (IS_ERR(params))
598                 return PTR_ERR(params);
599 
600         err = snd_pcm_hw_params(substream, params);
601         if (copy_to_user(_params, params, sizeof(*params))) {
602                 if (!err)
603                         err = -EFAULT;
604         }
605 
606         kfree(params);
607         return err;
608 }
609 
610 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
611 {
612         struct snd_pcm_runtime *runtime;
613         int result = 0;
614 
615         if (PCM_RUNTIME_CHECK(substream))
616                 return -ENXIO;
617         runtime = substream->runtime;
618         snd_pcm_stream_lock_irq(substream);
619         switch (runtime->status->state) {
620         case SNDRV_PCM_STATE_SETUP:
621         case SNDRV_PCM_STATE_PREPARED:
622                 break;
623         default:
624                 snd_pcm_stream_unlock_irq(substream);
625                 return -EBADFD;
626         }
627         snd_pcm_stream_unlock_irq(substream);
628         if (atomic_read(&substream->mmap_count))
629                 return -EBADFD;
630         if (substream->ops->hw_free)
631                 result = substream->ops->hw_free(substream);
632         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
633         pm_qos_remove_request(&substream->latency_pm_qos_req);
634         return result;
635 }
636 
637 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
638                              struct snd_pcm_sw_params *params)
639 {
640         struct snd_pcm_runtime *runtime;
641         int err;
642 
643         if (PCM_RUNTIME_CHECK(substream))
644                 return -ENXIO;
645         runtime = substream->runtime;
646         snd_pcm_stream_lock_irq(substream);
647         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
648                 snd_pcm_stream_unlock_irq(substream);
649                 return -EBADFD;
650         }
651         snd_pcm_stream_unlock_irq(substream);
652 
653         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
654                 return -EINVAL;
655         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
656             params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
657                 return -EINVAL;
658         if (params->avail_min == 0)
659                 return -EINVAL;
660         if (params->silence_size >= runtime->boundary) {
661                 if (params->silence_threshold != 0)
662                         return -EINVAL;
663         } else {
664                 if (params->silence_size > params->silence_threshold)
665                         return -EINVAL;
666                 if (params->silence_threshold > runtime->buffer_size)
667                         return -EINVAL;
668         }
669         err = 0;
670         snd_pcm_stream_lock_irq(substream);
671         runtime->tstamp_mode = params->tstamp_mode;
672         if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
673                 runtime->tstamp_type = params->tstamp_type;
674         runtime->period_step = params->period_step;
675         runtime->control->avail_min = params->avail_min;
676         runtime->start_threshold = params->start_threshold;
677         runtime->stop_threshold = params->stop_threshold;
678         runtime->silence_threshold = params->silence_threshold;
679         runtime->silence_size = params->silence_size;
680         params->boundary = runtime->boundary;
681         if (snd_pcm_running(substream)) {
682                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
683                     runtime->silence_size > 0)
684                         snd_pcm_playback_silence(substream, ULONG_MAX);
685                 err = snd_pcm_update_state(substream, runtime);
686         }
687         snd_pcm_stream_unlock_irq(substream);
688         return err;
689 }
690 
691 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
692                                   struct snd_pcm_sw_params __user * _params)
693 {
694         struct snd_pcm_sw_params params;
695         int err;
696         if (copy_from_user(&params, _params, sizeof(params)))
697                 return -EFAULT;
698         err = snd_pcm_sw_params(substream, &params);
699         if (copy_to_user(_params, &params, sizeof(params)))
700                 return -EFAULT;
701         return err;
702 }
703 
704 int snd_pcm_status(struct snd_pcm_substream *substream,
705                    struct snd_pcm_status *status)
706 {
707         struct snd_pcm_runtime *runtime = substream->runtime;
708 
709         snd_pcm_stream_lock_irq(substream);
710         status->state = runtime->status->state;
711         status->suspended_state = runtime->status->suspended_state;
712         if (status->state == SNDRV_PCM_STATE_OPEN)
713                 goto _end;
714         status->trigger_tstamp = runtime->trigger_tstamp;
715         if (snd_pcm_running(substream)) {
716                 snd_pcm_update_hw_ptr(substream);
717                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
718                         status->tstamp = runtime->status->tstamp;
719                         status->audio_tstamp =
720                                 runtime->status->audio_tstamp;
721                         goto _tstamp_end;
722                 }
723         } else {
724                 /* get tstamp only in fallback mode and only if enabled */
725                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
726                         snd_pcm_gettime(runtime, &status->tstamp);
727         }
728  _tstamp_end:
729         status->appl_ptr = runtime->control->appl_ptr;
730         status->hw_ptr = runtime->status->hw_ptr;
731         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
732                 status->avail = snd_pcm_playback_avail(runtime);
733                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
734                     runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
735                         status->delay = runtime->buffer_size - status->avail;
736                         status->delay += runtime->delay;
737                 } else
738                         status->delay = 0;
739         } else {
740                 status->avail = snd_pcm_capture_avail(runtime);
741                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
742                         status->delay = status->avail + runtime->delay;
743                 else
744                         status->delay = 0;
745         }
746         status->avail_max = runtime->avail_max;
747         status->overrange = runtime->overrange;
748         runtime->avail_max = 0;
749         runtime->overrange = 0;
750  _end:
751         snd_pcm_stream_unlock_irq(substream);
752         return 0;
753 }
754 
755 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
756                                struct snd_pcm_status __user * _status)
757 {
758         struct snd_pcm_status status;
759         int res;
760         
761         memset(&status, 0, sizeof(status));
762         res = snd_pcm_status(substream, &status);
763         if (res < 0)
764                 return res;
765         if (copy_to_user(_status, &status, sizeof(status)))
766                 return -EFAULT;
767         return 0;
768 }
769 
770 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
771                                 struct snd_pcm_channel_info * info)
772 {
773         struct snd_pcm_runtime *runtime;
774         unsigned int channel;
775         
776         channel = info->channel;
777         runtime = substream->runtime;
778         snd_pcm_stream_lock_irq(substream);
779         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
780                 snd_pcm_stream_unlock_irq(substream);
781                 return -EBADFD;
782         }
783         snd_pcm_stream_unlock_irq(substream);
784         if (channel >= runtime->channels)
785                 return -EINVAL;
786         memset(info, 0, sizeof(*info));
787         info->channel = channel;
788         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
789 }
790 
791 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
792                                      struct snd_pcm_channel_info __user * _info)
793 {
794         struct snd_pcm_channel_info info;
795         int res;
796         
797         if (copy_from_user(&info, _info, sizeof(info)))
798                 return -EFAULT;
799         res = snd_pcm_channel_info(substream, &info);
800         if (res < 0)
801                 return res;
802         if (copy_to_user(_info, &info, sizeof(info)))
803                 return -EFAULT;
804         return 0;
805 }
806 
807 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
808 {
809         struct snd_pcm_runtime *runtime = substream->runtime;
810         if (runtime->trigger_master == NULL)
811                 return;
812         if (runtime->trigger_master == substream) {
813                 if (!runtime->trigger_tstamp_latched)
814                         snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
815         } else {
816                 snd_pcm_trigger_tstamp(runtime->trigger_master);
817                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
818         }
819         runtime->trigger_master = NULL;
820 }
821 
822 struct action_ops {
823         int (*pre_action)(struct snd_pcm_substream *substream, int state);
824         int (*do_action)(struct snd_pcm_substream *substream, int state);
825         void (*undo_action)(struct snd_pcm_substream *substream, int state);
826         void (*post_action)(struct snd_pcm_substream *substream, int state);
827 };
828 
829 /*
830  *  this functions is core for handling of linked stream
831  *  Note: the stream state might be changed also on failure
832  *  Note2: call with calling stream lock + link lock
833  */
834 static int snd_pcm_action_group(struct action_ops *ops,
835                                 struct snd_pcm_substream *substream,
836                                 int state, int do_lock)
837 {
838         struct snd_pcm_substream *s = NULL;
839         struct snd_pcm_substream *s1;
840         int res = 0, depth = 1;
841 
842         snd_pcm_group_for_each_entry(s, substream) {
843                 if (do_lock && s != substream) {
844                         if (s->pcm->nonatomic)
845                                 mutex_lock_nested(&s->self_group.mutex, depth);
846                         else
847                                 spin_lock_nested(&s->self_group.lock, depth);
848                         depth++;
849                 }
850                 res = ops->pre_action(s, state);
851                 if (res < 0)
852                         goto _unlock;
853         }
854         snd_pcm_group_for_each_entry(s, substream) {
855                 res = ops->do_action(s, state);
856                 if (res < 0) {
857                         if (ops->undo_action) {
858                                 snd_pcm_group_for_each_entry(s1, substream) {
859                                         if (s1 == s) /* failed stream */
860                                                 break;
861                                         ops->undo_action(s1, state);
862                                 }
863                         }
864                         s = NULL; /* unlock all */
865                         goto _unlock;
866                 }
867         }
868         snd_pcm_group_for_each_entry(s, substream) {
869                 ops->post_action(s, state);
870         }
871  _unlock:
872         if (do_lock) {
873                 /* unlock streams */
874                 snd_pcm_group_for_each_entry(s1, substream) {
875                         if (s1 != substream) {
876                                 if (s1->pcm->nonatomic)
877                                         mutex_unlock(&s1->self_group.mutex);
878                                 else
879                                         spin_unlock(&s1->self_group.lock);
880                         }
881                         if (s1 == s)    /* end */
882                                 break;
883                 }
884         }
885         return res;
886 }
887 
888 /*
889  *  Note: call with stream lock
890  */
891 static int snd_pcm_action_single(struct action_ops *ops,
892                                  struct snd_pcm_substream *substream,
893                                  int state)
894 {
895         int res;
896         
897         res = ops->pre_action(substream, state);
898         if (res < 0)
899                 return res;
900         res = ops->do_action(substream, state);
901         if (res == 0)
902                 ops->post_action(substream, state);
903         else if (ops->undo_action)
904                 ops->undo_action(substream, state);
905         return res;
906 }
907 
908 /*
909  *  Note: call with stream lock
910  */
911 static int snd_pcm_action(struct action_ops *ops,
912                           struct snd_pcm_substream *substream,
913                           int state)
914 {
915         int res;
916 
917         if (!snd_pcm_stream_linked(substream))
918                 return snd_pcm_action_single(ops, substream, state);
919 
920         if (substream->pcm->nonatomic) {
921                 if (!mutex_trylock(&substream->group->mutex)) {
922                         mutex_unlock(&substream->self_group.mutex);
923                         mutex_lock(&substream->group->mutex);
924                         mutex_lock(&substream->self_group.mutex);
925                 }
926                 res = snd_pcm_action_group(ops, substream, state, 1);
927                 mutex_unlock(&substream->group->mutex);
928         } else {
929                 if (!spin_trylock(&substream->group->lock)) {
930                         spin_unlock(&substream->self_group.lock);
931                         spin_lock(&substream->group->lock);
932                         spin_lock(&substream->self_group.lock);
933                 }
934                 res = snd_pcm_action_group(ops, substream, state, 1);
935                 spin_unlock(&substream->group->lock);
936         }
937         return res;
938 }
939 
940 /*
941  *  Note: don't use any locks before
942  */
943 static int snd_pcm_action_lock_irq(struct action_ops *ops,
944                                    struct snd_pcm_substream *substream,
945                                    int state)
946 {
947         int res;
948 
949         snd_pcm_stream_lock_irq(substream);
950         res = snd_pcm_action(ops, substream, state);
951         snd_pcm_stream_unlock_irq(substream);
952         return res;
953 }
954 
955 /*
956  */
957 static int snd_pcm_action_nonatomic(struct action_ops *ops,
958                                     struct snd_pcm_substream *substream,
959                                     int state)
960 {
961         int res;
962 
963         down_read(&snd_pcm_link_rwsem);
964         if (snd_pcm_stream_linked(substream))
965                 res = snd_pcm_action_group(ops, substream, state, 0);
966         else
967                 res = snd_pcm_action_single(ops, substream, state);
968         up_read(&snd_pcm_link_rwsem);
969         return res;
970 }
971 
972 /*
973  * start callbacks
974  */
975 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
976 {
977         struct snd_pcm_runtime *runtime = substream->runtime;
978         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
979                 return -EBADFD;
980         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
981             !snd_pcm_playback_data(substream))
982                 return -EPIPE;
983         runtime->trigger_tstamp_latched = false;
984         runtime->trigger_master = substream;
985         return 0;
986 }
987 
988 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
989 {
990         if (substream->runtime->trigger_master != substream)
991                 return 0;
992         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
993 }
994 
995 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
996 {
997         if (substream->runtime->trigger_master == substream)
998                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
999 }
1000 
1001 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
1002 {
1003         struct snd_pcm_runtime *runtime = substream->runtime;
1004         snd_pcm_trigger_tstamp(substream);
1005         runtime->hw_ptr_jiffies = jiffies;
1006         runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 
1007                                                             runtime->rate;
1008         runtime->status->state = state;
1009         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1010             runtime->silence_size > 0)
1011                 snd_pcm_playback_silence(substream, ULONG_MAX);
1012         if (substream->timer)
1013                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
1014                                  &runtime->trigger_tstamp);
1015 }
1016 
1017 static struct action_ops snd_pcm_action_start = {
1018         .pre_action = snd_pcm_pre_start,
1019         .do_action = snd_pcm_do_start,
1020         .undo_action = snd_pcm_undo_start,
1021         .post_action = snd_pcm_post_start
1022 };
1023 
1024 /**
1025  * snd_pcm_start - start all linked streams
1026  * @substream: the PCM substream instance
1027  *
1028  * Return: Zero if successful, or a negative error code.
1029  */
1030 int snd_pcm_start(struct snd_pcm_substream *substream)
1031 {
1032         return snd_pcm_action(&snd_pcm_action_start, substream,
1033                               SNDRV_PCM_STATE_RUNNING);
1034 }
1035 
1036 /*
1037  * stop callbacks
1038  */
1039 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1040 {
1041         struct snd_pcm_runtime *runtime = substream->runtime;
1042         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1043                 return -EBADFD;
1044         runtime->trigger_master = substream;
1045         return 0;
1046 }
1047 
1048 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1049 {
1050         if (substream->runtime->trigger_master == substream &&
1051             snd_pcm_running(substream))
1052                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1053         return 0; /* unconditonally stop all substreams */
1054 }
1055 
1056 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1057 {
1058         struct snd_pcm_runtime *runtime = substream->runtime;
1059         if (runtime->status->state != state) {
1060                 snd_pcm_trigger_tstamp(substream);
1061                 runtime->status->state = state;
1062                 if (substream->timer)
1063                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
1064                                          &runtime->trigger_tstamp);
1065         }
1066         wake_up(&runtime->sleep);
1067         wake_up(&runtime->tsleep);
1068 }
1069 
1070 static struct action_ops snd_pcm_action_stop = {
1071         .pre_action = snd_pcm_pre_stop,
1072         .do_action = snd_pcm_do_stop,
1073         .post_action = snd_pcm_post_stop
1074 };
1075 
1076 /**
1077  * snd_pcm_stop - try to stop all running streams in the substream group
1078  * @substream: the PCM substream instance
1079  * @state: PCM state after stopping the stream
1080  *
1081  * The state of each stream is then changed to the given state unconditionally.
1082  *
1083  * Return: Zero if successful, or a negative error code.
1084  */
1085 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1086 {
1087         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1088 }
1089 
1090 EXPORT_SYMBOL(snd_pcm_stop);
1091 
1092 /**
1093  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1094  * @substream: the PCM substream
1095  *
1096  * After stopping, the state is changed to SETUP.
1097  * Unlike snd_pcm_stop(), this affects only the given stream.
1098  *
1099  * Return: Zero if succesful, or a negative error code.
1100  */
1101 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1102 {
1103         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1104                                      SNDRV_PCM_STATE_SETUP);
1105 }
1106 
1107 /**
1108  * snd_pcm_stop_xrun - stop the running streams as XRUN
1109  * @substream: the PCM substream instance
1110  *
1111  * This stops the given running substream (and all linked substreams) as XRUN.
1112  * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1113  *
1114  * Return: Zero if successful, or a negative error code.
1115  */
1116 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1117 {
1118         unsigned long flags;
1119         int ret = 0;
1120 
1121         snd_pcm_stream_lock_irqsave(substream, flags);
1122         if (snd_pcm_running(substream))
1123                 ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1124         snd_pcm_stream_unlock_irqrestore(substream, flags);
1125         return ret;
1126 }
1127 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1128 
1129 /*
1130  * pause callbacks
1131  */
1132 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1133 {
1134         struct snd_pcm_runtime *runtime = substream->runtime;
1135         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1136                 return -ENOSYS;
1137         if (push) {
1138                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1139                         return -EBADFD;
1140         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1141                 return -EBADFD;
1142         runtime->trigger_master = substream;
1143         return 0;
1144 }
1145 
1146 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1147 {
1148         if (substream->runtime->trigger_master != substream)
1149                 return 0;
1150         /* some drivers might use hw_ptr to recover from the pause -
1151            update the hw_ptr now */
1152         if (push)
1153                 snd_pcm_update_hw_ptr(substream);
1154         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1155          * a delta between the current jiffies, this gives a large enough
1156          * delta, effectively to skip the check once.
1157          */
1158         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1159         return substream->ops->trigger(substream,
1160                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1161                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1162 }
1163 
1164 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1165 {
1166         if (substream->runtime->trigger_master == substream)
1167                 substream->ops->trigger(substream,
1168                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1169                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1170 }
1171 
1172 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1173 {
1174         struct snd_pcm_runtime *runtime = substream->runtime;
1175         snd_pcm_trigger_tstamp(substream);
1176         if (push) {
1177                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1178                 if (substream->timer)
1179                         snd_timer_notify(substream->timer,
1180                                          SNDRV_TIMER_EVENT_MPAUSE,
1181                                          &runtime->trigger_tstamp);
1182                 wake_up(&runtime->sleep);
1183                 wake_up(&runtime->tsleep);
1184         } else {
1185                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1186                 if (substream->timer)
1187                         snd_timer_notify(substream->timer,
1188                                          SNDRV_TIMER_EVENT_MCONTINUE,
1189                                          &runtime->trigger_tstamp);
1190         }
1191 }
1192 
1193 static struct action_ops snd_pcm_action_pause = {
1194         .pre_action = snd_pcm_pre_pause,
1195         .do_action = snd_pcm_do_pause,
1196         .undo_action = snd_pcm_undo_pause,
1197         .post_action = snd_pcm_post_pause
1198 };
1199 
1200 /*
1201  * Push/release the pause for all linked streams.
1202  */
1203 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1204 {
1205         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1206 }
1207 
1208 #ifdef CONFIG_PM
1209 /* suspend */
1210 
1211 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1212 {
1213         struct snd_pcm_runtime *runtime = substream->runtime;
1214         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1215                 return -EBUSY;
1216         runtime->trigger_master = substream;
1217         return 0;
1218 }
1219 
1220 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1221 {
1222         struct snd_pcm_runtime *runtime = substream->runtime;
1223         if (runtime->trigger_master != substream)
1224                 return 0;
1225         if (! snd_pcm_running(substream))
1226                 return 0;
1227         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1228         return 0; /* suspend unconditionally */
1229 }
1230 
1231 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1232 {
1233         struct snd_pcm_runtime *runtime = substream->runtime;
1234         snd_pcm_trigger_tstamp(substream);
1235         runtime->status->suspended_state = runtime->status->state;
1236         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1237         if (substream->timer)
1238                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1239                                  &runtime->trigger_tstamp);
1240         wake_up(&runtime->sleep);
1241         wake_up(&runtime->tsleep);
1242 }
1243 
1244 static struct action_ops snd_pcm_action_suspend = {
1245         .pre_action = snd_pcm_pre_suspend,
1246         .do_action = snd_pcm_do_suspend,
1247         .post_action = snd_pcm_post_suspend
1248 };
1249 
1250 /**
1251  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1252  * @substream: the PCM substream
1253  *
1254  * After this call, all streams are changed to SUSPENDED state.
1255  *
1256  * Return: Zero if successful (or @substream is %NULL), or a negative error
1257  * code.
1258  */
1259 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1260 {
1261         int err;
1262         unsigned long flags;
1263 
1264         if (! substream)
1265                 return 0;
1266 
1267         snd_pcm_stream_lock_irqsave(substream, flags);
1268         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1269         snd_pcm_stream_unlock_irqrestore(substream, flags);
1270         return err;
1271 }
1272 
1273 EXPORT_SYMBOL(snd_pcm_suspend);
1274 
1275 /**
1276  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1277  * @pcm: the PCM instance
1278  *
1279  * After this call, all streams are changed to SUSPENDED state.
1280  *
1281  * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1282  */
1283 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1284 {
1285         struct snd_pcm_substream *substream;
1286         int stream, err = 0;
1287 
1288         if (! pcm)
1289                 return 0;
1290 
1291         for (stream = 0; stream < 2; stream++) {
1292                 for (substream = pcm->streams[stream].substream;
1293                      substream; substream = substream->next) {
1294                         /* FIXME: the open/close code should lock this as well */
1295                         if (substream->runtime == NULL)
1296                                 continue;
1297                         err = snd_pcm_suspend(substream);
1298                         if (err < 0 && err != -EBUSY)
1299                                 return err;
1300                 }
1301         }
1302         return 0;
1303 }
1304 
1305 EXPORT_SYMBOL(snd_pcm_suspend_all);
1306 
1307 /* resume */
1308 
1309 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1310 {
1311         struct snd_pcm_runtime *runtime = substream->runtime;
1312         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1313                 return -ENOSYS;
1314         runtime->trigger_master = substream;
1315         return 0;
1316 }
1317 
1318 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1319 {
1320         struct snd_pcm_runtime *runtime = substream->runtime;
1321         if (runtime->trigger_master != substream)
1322                 return 0;
1323         /* DMA not running previously? */
1324         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1325             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1326              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1327                 return 0;
1328         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1329 }
1330 
1331 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1332 {
1333         if (substream->runtime->trigger_master == substream &&
1334             snd_pcm_running(substream))
1335                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1336 }
1337 
1338 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1339 {
1340         struct snd_pcm_runtime *runtime = substream->runtime;
1341         snd_pcm_trigger_tstamp(substream);
1342         runtime->status->state = runtime->status->suspended_state;
1343         if (substream->timer)
1344                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1345                                  &runtime->trigger_tstamp);
1346 }
1347 
1348 static struct action_ops snd_pcm_action_resume = {
1349         .pre_action = snd_pcm_pre_resume,
1350         .do_action = snd_pcm_do_resume,
1351         .undo_action = snd_pcm_undo_resume,
1352         .post_action = snd_pcm_post_resume
1353 };
1354 
1355 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1356 {
1357         struct snd_card *card = substream->pcm->card;
1358         int res;
1359 
1360         snd_power_lock(card);
1361         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1362                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1363         snd_power_unlock(card);
1364         return res;
1365 }
1366 
1367 #else
1368 
1369 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1370 {
1371         return -ENOSYS;
1372 }
1373 
1374 #endif /* CONFIG_PM */
1375 
1376 /*
1377  * xrun ioctl
1378  *
1379  * Change the RUNNING stream(s) to XRUN state.
1380  */
1381 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1382 {
1383         struct snd_card *card = substream->pcm->card;
1384         struct snd_pcm_runtime *runtime = substream->runtime;
1385         int result;
1386 
1387         snd_power_lock(card);
1388         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1389                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1390                 if (result < 0)
1391                         goto _unlock;
1392         }
1393 
1394         snd_pcm_stream_lock_irq(substream);
1395         switch (runtime->status->state) {
1396         case SNDRV_PCM_STATE_XRUN:
1397                 result = 0;     /* already there */
1398                 break;
1399         case SNDRV_PCM_STATE_RUNNING:
1400                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1401                 break;
1402         default:
1403                 result = -EBADFD;
1404         }
1405         snd_pcm_stream_unlock_irq(substream);
1406  _unlock:
1407         snd_power_unlock(card);
1408         return result;
1409 }
1410 
1411 /*
1412  * reset ioctl
1413  */
1414 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1415 {
1416         struct snd_pcm_runtime *runtime = substream->runtime;
1417         switch (runtime->status->state) {
1418         case SNDRV_PCM_STATE_RUNNING:
1419         case SNDRV_PCM_STATE_PREPARED:
1420         case SNDRV_PCM_STATE_PAUSED:
1421         case SNDRV_PCM_STATE_SUSPENDED:
1422                 return 0;
1423         default:
1424                 return -EBADFD;
1425         }
1426 }
1427 
1428 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1429 {
1430         struct snd_pcm_runtime *runtime = substream->runtime;
1431         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1432         if (err < 0)
1433                 return err;
1434         runtime->hw_ptr_base = 0;
1435         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1436                 runtime->status->hw_ptr % runtime->period_size;
1437         runtime->silence_start = runtime->status->hw_ptr;
1438         runtime->silence_filled = 0;
1439         return 0;
1440 }
1441 
1442 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1443 {
1444         struct snd_pcm_runtime *runtime = substream->runtime;
1445         runtime->control->appl_ptr = runtime->status->hw_ptr;
1446         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1447             runtime->silence_size > 0)
1448                 snd_pcm_playback_silence(substream, ULONG_MAX);
1449 }
1450 
1451 static struct action_ops snd_pcm_action_reset = {
1452         .pre_action = snd_pcm_pre_reset,
1453         .do_action = snd_pcm_do_reset,
1454         .post_action = snd_pcm_post_reset
1455 };
1456 
1457 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1458 {
1459         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1460 }
1461 
1462 /*
1463  * prepare ioctl
1464  */
1465 /* we use the second argument for updating f_flags */
1466 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1467                                int f_flags)
1468 {
1469         struct snd_pcm_runtime *runtime = substream->runtime;
1470         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1471             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1472                 return -EBADFD;
1473         if (snd_pcm_running(substream))
1474                 return -EBUSY;
1475         substream->f_flags = f_flags;
1476         return 0;
1477 }
1478 
1479 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1480 {
1481         int err;
1482         err = substream->ops->prepare(substream);
1483         if (err < 0)
1484                 return err;
1485         return snd_pcm_do_reset(substream, 0);
1486 }
1487 
1488 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1489 {
1490         struct snd_pcm_runtime *runtime = substream->runtime;
1491         runtime->control->appl_ptr = runtime->status->hw_ptr;
1492         snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1493 }
1494 
1495 static struct action_ops snd_pcm_action_prepare = {
1496         .pre_action = snd_pcm_pre_prepare,
1497         .do_action = snd_pcm_do_prepare,
1498         .post_action = snd_pcm_post_prepare
1499 };
1500 
1501 /**
1502  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1503  * @substream: the PCM substream instance
1504  * @file: file to refer f_flags
1505  *
1506  * Return: Zero if successful, or a negative error code.
1507  */
1508 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1509                            struct file *file)
1510 {
1511         int res;
1512         struct snd_card *card = substream->pcm->card;
1513         int f_flags;
1514 
1515         if (file)
1516                 f_flags = file->f_flags;
1517         else
1518                 f_flags = substream->f_flags;
1519 
1520         snd_power_lock(card);
1521         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1522                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1523                                                substream, f_flags);
1524         snd_power_unlock(card);
1525         return res;
1526 }
1527 
1528 /*
1529  * drain ioctl
1530  */
1531 
1532 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1533 {
1534         struct snd_pcm_runtime *runtime = substream->runtime;
1535         switch (runtime->status->state) {
1536         case SNDRV_PCM_STATE_OPEN:
1537         case SNDRV_PCM_STATE_DISCONNECTED:
1538         case SNDRV_PCM_STATE_SUSPENDED:
1539                 return -EBADFD;
1540         }
1541         runtime->trigger_master = substream;
1542         return 0;
1543 }
1544 
1545 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1546 {
1547         struct snd_pcm_runtime *runtime = substream->runtime;
1548         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1549                 switch (runtime->status->state) {
1550                 case SNDRV_PCM_STATE_PREPARED:
1551                         /* start playback stream if possible */
1552                         if (! snd_pcm_playback_empty(substream)) {
1553                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1554                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1555                         } else {
1556                                 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1557                         }
1558                         break;
1559                 case SNDRV_PCM_STATE_RUNNING:
1560                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1561                         break;
1562                 case SNDRV_PCM_STATE_XRUN:
1563                         runtime->status->state = SNDRV_PCM_STATE_SETUP;
1564                         break;
1565                 default:
1566                         break;
1567                 }
1568         } else {
1569                 /* stop running stream */
1570                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1571                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1572                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1573                         snd_pcm_do_stop(substream, new_state);
1574                         snd_pcm_post_stop(substream, new_state);
1575                 }
1576         }
1577 
1578         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1579             runtime->trigger_master == substream &&
1580             (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1581                 return substream->ops->trigger(substream,
1582                                                SNDRV_PCM_TRIGGER_DRAIN);
1583 
1584         return 0;
1585 }
1586 
1587 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1588 {
1589 }
1590 
1591 static struct action_ops snd_pcm_action_drain_init = {
1592         .pre_action = snd_pcm_pre_drain_init,
1593         .do_action = snd_pcm_do_drain_init,
1594         .post_action = snd_pcm_post_drain_init
1595 };
1596 
1597 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1598 
1599 /*
1600  * Drain the stream(s).
1601  * When the substream is linked, sync until the draining of all playback streams
1602  * is finished.
1603  * After this call, all streams are supposed to be either SETUP or DRAINING
1604  * (capture only) state.
1605  */
1606 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1607                          struct file *file)
1608 {
1609         struct snd_card *card;
1610         struct snd_pcm_runtime *runtime;
1611         struct snd_pcm_substream *s;
1612         wait_queue_t wait;
1613         int result = 0;
1614         int nonblock = 0;
1615 
1616         card = substream->pcm->card;
1617         runtime = substream->runtime;
1618 
1619         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1620                 return -EBADFD;
1621 
1622         snd_power_lock(card);
1623         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1624                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1625                 if (result < 0) {
1626                         snd_power_unlock(card);
1627                         return result;
1628                 }
1629         }
1630 
1631         if (file) {
1632                 if (file->f_flags & O_NONBLOCK)
1633                         nonblock = 1;
1634         } else if (substream->f_flags & O_NONBLOCK)
1635                 nonblock = 1;
1636 
1637         down_read(&snd_pcm_link_rwsem);
1638         snd_pcm_stream_lock_irq(substream);
1639         /* resume pause */
1640         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1641                 snd_pcm_pause(substream, 0);
1642 
1643         /* pre-start/stop - all running streams are changed to DRAINING state */
1644         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1645         if (result < 0)
1646                 goto unlock;
1647         /* in non-blocking, we don't wait in ioctl but let caller poll */
1648         if (nonblock) {
1649                 result = -EAGAIN;
1650                 goto unlock;
1651         }
1652 
1653         for (;;) {
1654                 long tout;
1655                 struct snd_pcm_runtime *to_check;
1656                 if (signal_pending(current)) {
1657                         result = -ERESTARTSYS;
1658                         break;
1659                 }
1660                 /* find a substream to drain */
1661                 to_check = NULL;
1662                 snd_pcm_group_for_each_entry(s, substream) {
1663                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1664                                 continue;
1665                         runtime = s->runtime;
1666                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1667                                 to_check = runtime;
1668                                 break;
1669                         }
1670                 }
1671                 if (!to_check)
1672                         break; /* all drained */
1673                 init_waitqueue_entry(&wait, current);
1674                 add_wait_queue(&to_check->sleep, &wait);
1675                 snd_pcm_stream_unlock_irq(substream);
1676                 up_read(&snd_pcm_link_rwsem);
1677                 snd_power_unlock(card);
1678                 if (runtime->no_period_wakeup)
1679                         tout = MAX_SCHEDULE_TIMEOUT;
1680                 else {
1681                         tout = 10;
1682                         if (runtime->rate) {
1683                                 long t = runtime->period_size * 2 / runtime->rate;
1684                                 tout = max(t, tout);
1685                         }
1686                         tout = msecs_to_jiffies(tout * 1000);
1687                 }
1688                 tout = schedule_timeout_interruptible(tout);
1689                 snd_power_lock(card);
1690                 down_read(&snd_pcm_link_rwsem);
1691                 snd_pcm_stream_lock_irq(substream);
1692                 remove_wait_queue(&to_check->sleep, &wait);
1693                 if (card->shutdown) {
1694                         result = -ENODEV;
1695                         break;
1696                 }
1697                 if (tout == 0) {
1698                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1699                                 result = -ESTRPIPE;
1700                         else {
1701                                 dev_dbg(substream->pcm->card->dev,
1702                                         "playback drain error (DMA or IRQ trouble?)\n");
1703                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1704                                 result = -EIO;
1705                         }
1706                         break;
1707                 }
1708         }
1709 
1710  unlock:
1711         snd_pcm_stream_unlock_irq(substream);
1712         up_read(&snd_pcm_link_rwsem);
1713         snd_power_unlock(card);
1714 
1715         return result;
1716 }
1717 
1718 /*
1719  * drop ioctl
1720  *
1721  * Immediately put all linked substreams into SETUP state.
1722  */
1723 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1724 {
1725         struct snd_pcm_runtime *runtime;
1726         int result = 0;
1727         
1728         if (PCM_RUNTIME_CHECK(substream))
1729                 return -ENXIO;
1730         runtime = substream->runtime;
1731 
1732         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1733             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1734             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1735                 return -EBADFD;
1736 
1737         snd_pcm_stream_lock_irq(substream);
1738         /* resume pause */
1739         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1740                 snd_pcm_pause(substream, 0);
1741 
1742         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1743         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1744         snd_pcm_stream_unlock_irq(substream);
1745 
1746         return result;
1747 }
1748 
1749 
1750 static bool is_pcm_file(struct file *file)
1751 {
1752         struct inode *inode = file_inode(file);
1753         unsigned int minor;
1754 
1755         if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1756                 return false;
1757         minor = iminor(inode);
1758         return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1759                 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1760 }
1761 
1762 /*
1763  * PCM link handling
1764  */
1765 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1766 {
1767         int res = 0;
1768         struct snd_pcm_file *pcm_file;
1769         struct snd_pcm_substream *substream1;
1770         struct snd_pcm_group *group;
1771         struct fd f = fdget(fd);
1772 
1773         if (!f.file)
1774                 return -EBADFD;
1775         if (!is_pcm_file(f.file)) {
1776                 res = -EBADFD;
1777                 goto _badf;
1778         }
1779         pcm_file = f.file->private_data;
1780         substream1 = pcm_file->substream;
1781         group = kmalloc(sizeof(*group), GFP_KERNEL);
1782         if (!group) {
1783                 res = -ENOMEM;
1784                 goto _nolock;
1785         }
1786         down_write(&snd_pcm_link_rwsem);
1787         write_lock_irq(&snd_pcm_link_rwlock);
1788         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1789             substream->runtime->status->state != substream1->runtime->status->state ||
1790             substream->pcm->nonatomic != substream1->pcm->nonatomic) {
1791                 res = -EBADFD;
1792                 goto _end;
1793         }
1794         if (snd_pcm_stream_linked(substream1)) {
1795                 res = -EALREADY;
1796                 goto _end;
1797         }
1798         if (!snd_pcm_stream_linked(substream)) {
1799                 substream->group = group;
1800                 group = NULL;
1801                 spin_lock_init(&substream->group->lock);
1802                 mutex_init(&substream->group->mutex);
1803                 INIT_LIST_HEAD(&substream->group->substreams);
1804                 list_add_tail(&substream->link_list, &substream->group->substreams);
1805                 substream->group->count = 1;
1806         }
1807         list_add_tail(&substream1->link_list, &substream->group->substreams);
1808         substream->group->count++;
1809         substream1->group = substream->group;
1810  _end:
1811         write_unlock_irq(&snd_pcm_link_rwlock);
1812         up_write(&snd_pcm_link_rwsem);
1813  _nolock:
1814         snd_card_unref(substream1->pcm->card);
1815         kfree(group);
1816  _badf:
1817         fdput(f);
1818         return res;
1819 }
1820 
1821 static void relink_to_local(struct snd_pcm_substream *substream)
1822 {
1823         substream->group = &substream->self_group;
1824         INIT_LIST_HEAD(&substream->self_group.substreams);
1825         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1826 }
1827 
1828 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1829 {
1830         struct snd_pcm_substream *s;
1831         int res = 0;
1832 
1833         down_write(&snd_pcm_link_rwsem);
1834         write_lock_irq(&snd_pcm_link_rwlock);
1835         if (!snd_pcm_stream_linked(substream)) {
1836                 res = -EALREADY;
1837                 goto _end;
1838         }
1839         list_del(&substream->link_list);
1840         substream->group->count--;
1841         if (substream->group->count == 1) {     /* detach the last stream, too */
1842                 snd_pcm_group_for_each_entry(s, substream) {
1843                         relink_to_local(s);
1844                         break;
1845                 }
1846                 kfree(substream->group);
1847         }
1848         relink_to_local(substream);
1849        _end:
1850         write_unlock_irq(&snd_pcm_link_rwlock);
1851         up_write(&snd_pcm_link_rwsem);
1852         return res;
1853 }
1854 
1855 /*
1856  * hw configurator
1857  */
1858 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1859                                struct snd_pcm_hw_rule *rule)
1860 {
1861         struct snd_interval t;
1862         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1863                      hw_param_interval_c(params, rule->deps[1]), &t);
1864         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1865 }
1866 
1867 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1868                                struct snd_pcm_hw_rule *rule)
1869 {
1870         struct snd_interval t;
1871         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1872                      hw_param_interval_c(params, rule->deps[1]), &t);
1873         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1874 }
1875 
1876 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1877                                    struct snd_pcm_hw_rule *rule)
1878 {
1879         struct snd_interval t;
1880         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1881                          hw_param_interval_c(params, rule->deps[1]),
1882                          (unsigned long) rule->private, &t);
1883         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1884 }
1885 
1886 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1887                                    struct snd_pcm_hw_rule *rule)
1888 {
1889         struct snd_interval t;
1890         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1891                          (unsigned long) rule->private,
1892                          hw_param_interval_c(params, rule->deps[1]), &t);
1893         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1894 }
1895 
1896 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1897                                   struct snd_pcm_hw_rule *rule)
1898 {
1899         unsigned int k;
1900         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1901         struct snd_mask m;
1902         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1903         snd_mask_any(&m);
1904         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1905                 int bits;
1906                 if (! snd_mask_test(mask, k))
1907                         continue;
1908                 bits = snd_pcm_format_physical_width(k);
1909                 if (bits <= 0)
1910                         continue; /* ignore invalid formats */
1911                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1912                         snd_mask_reset(&m, k);
1913         }
1914         return snd_mask_refine(mask, &m);
1915 }
1916 
1917 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1918                                        struct snd_pcm_hw_rule *rule)
1919 {
1920         struct snd_interval t;
1921         unsigned int k;
1922         t.min = UINT_MAX;
1923         t.max = 0;
1924         t.openmin = 0;
1925         t.openmax = 0;
1926         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1927                 int bits;
1928                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1929                         continue;
1930                 bits = snd_pcm_format_physical_width(k);
1931                 if (bits <= 0)
1932                         continue; /* ignore invalid formats */
1933                 if (t.min > (unsigned)bits)
1934                         t.min = bits;
1935                 if (t.max < (unsigned)bits)
1936                         t.max = bits;
1937         }
1938         t.integer = 1;
1939         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1940 }
1941 
1942 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1943 #error "Change this table"
1944 #endif
1945 
1946 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1947                                  48000, 64000, 88200, 96000, 176400, 192000 };
1948 
1949 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1950         .count = ARRAY_SIZE(rates),
1951         .list = rates,
1952 };
1953 
1954 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1955                                 struct snd_pcm_hw_rule *rule)
1956 {
1957         struct snd_pcm_hardware *hw = rule->private;
1958         return snd_interval_list(hw_param_interval(params, rule->var),
1959                                  snd_pcm_known_rates.count,
1960                                  snd_pcm_known_rates.list, hw->rates);
1961 }               
1962 
1963 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1964                                             struct snd_pcm_hw_rule *rule)
1965 {
1966         struct snd_interval t;
1967         struct snd_pcm_substream *substream = rule->private;
1968         t.min = 0;
1969         t.max = substream->buffer_bytes_max;
1970         t.openmin = 0;
1971         t.openmax = 0;
1972         t.integer = 1;
1973         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1974 }               
1975 
1976 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1977 {
1978         struct snd_pcm_runtime *runtime = substream->runtime;
1979         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1980         int k, err;
1981 
1982         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1983                 snd_mask_any(constrs_mask(constrs, k));
1984         }
1985 
1986         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1987                 snd_interval_any(constrs_interval(constrs, k));
1988         }
1989 
1990         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1991         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1992         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1993         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1994         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1995 
1996         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1997                                    snd_pcm_hw_rule_format, NULL,
1998                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1999         if (err < 0)
2000                 return err;
2001         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 
2002                                   snd_pcm_hw_rule_sample_bits, NULL,
2003                                   SNDRV_PCM_HW_PARAM_FORMAT, 
2004                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2005         if (err < 0)
2006                 return err;
2007         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 
2008                                   snd_pcm_hw_rule_div, NULL,
2009                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2010         if (err < 0)
2011                 return err;
2012         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
2013                                   snd_pcm_hw_rule_mul, NULL,
2014                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2015         if (err < 0)
2016                 return err;
2017         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
2018                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2019                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2020         if (err < 0)
2021                 return err;
2022         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
2023                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2024                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2025         if (err < 0)
2026                 return err;
2027         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 
2028                                   snd_pcm_hw_rule_div, NULL,
2029                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2030         if (err < 0)
2031                 return err;
2032         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
2033                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2034                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2035         if (err < 0)
2036                 return err;
2037         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
2038                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2039                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2040         if (err < 0)
2041                 return err;
2042         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 
2043                                   snd_pcm_hw_rule_div, NULL,
2044                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2045         if (err < 0)
2046                 return err;
2047         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
2048                                   snd_pcm_hw_rule_div, NULL,
2049                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2050         if (err < 0)
2051                 return err;
2052         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
2053                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2054                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2055         if (err < 0)
2056                 return err;
2057         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
2058                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2059                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2060         if (err < 0)
2061                 return err;
2062         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
2063                                   snd_pcm_hw_rule_mul, NULL,
2064                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2065         if (err < 0)
2066                 return err;
2067         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
2068                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
2069                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2070         if (err < 0)
2071                 return err;
2072         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
2073                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
2074                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2075         if (err < 0)
2076                 return err;
2077         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 
2078                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2079                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2080         if (err < 0)
2081                 return err;
2082         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 
2083                                   snd_pcm_hw_rule_muldivk, (void*) 8,
2084                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2085         if (err < 0)
2086                 return err;
2087         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 
2088                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2089                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2090         if (err < 0)
2091                 return err;
2092         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 
2093                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2094                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2095         if (err < 0)
2096                 return err;
2097         return 0;
2098 }
2099 
2100 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2101 {
2102         struct snd_pcm_runtime *runtime = substream->runtime;
2103         struct snd_pcm_hardware *hw = &runtime->hw;
2104         int err;
2105         unsigned int mask = 0;
2106 
2107         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2108                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2109         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2110                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2111         if (hw_support_mmap(substream)) {
2112                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2113                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2114                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2115                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2116                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2117                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2118         }
2119         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2120         if (err < 0)
2121                 return err;
2122 
2123         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2124         if (err < 0)
2125                 return err;
2126 
2127         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2128         if (err < 0)
2129                 return err;
2130 
2131         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2132                                            hw->channels_min, hw->channels_max);
2133         if (err < 0)
2134                 return err;
2135 
2136         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2137                                            hw->rate_min, hw->rate_max);
2138         if (err < 0)
2139                 return err;
2140 
2141         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2142                                            hw->period_bytes_min, hw->period_bytes_max);
2143         if (err < 0)
2144                 return err;
2145 
2146         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2147                                            hw->periods_min, hw->periods_max);
2148         if (err < 0)
2149                 return err;
2150 
2151         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2152                                            hw->period_bytes_min, hw->buffer_bytes_max);
2153         if (err < 0)
2154                 return err;
2155 
2156         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 
2157                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
2158                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2159         if (err < 0)
2160                 return err;
2161 
2162         /* FIXME: remove */
2163         if (runtime->dma_bytes) {
2164                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2165                 if (err < 0)
2166                         return err;
2167         }
2168 
2169         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2170                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
2171                                           snd_pcm_hw_rule_rate, hw,
2172                                           SNDRV_PCM_HW_PARAM_RATE, -1);
2173                 if (err < 0)
2174                         return err;
2175         }
2176 
2177         /* FIXME: this belong to lowlevel */
2178         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2179 
2180         return 0;
2181 }
2182 
2183 static void pcm_release_private(struct snd_pcm_substream *substream)
2184 {
2185         snd_pcm_unlink(substream);
2186 }
2187 
2188 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2189 {
2190         substream->ref_count--;
2191         if (substream->ref_count > 0)
2192                 return;
2193 
2194         snd_pcm_drop(substream);
2195         if (substream->hw_opened) {
2196                 if (substream->ops->hw_free != NULL)
2197                         substream->ops->hw_free(substream);
2198                 substream->ops->close(substream);
2199                 substream->hw_opened = 0;
2200         }
2201         if (pm_qos_request_active(&substream->latency_pm_qos_req))
2202                 pm_qos_remove_request(&substream->latency_pm_qos_req);
2203         if (substream->pcm_release) {
2204                 substream->pcm_release(substream);
2205                 substream->pcm_release = NULL;
2206         }
2207         snd_pcm_detach_substream(substream);
2208 }
2209 
2210 EXPORT_SYMBOL(snd_pcm_release_substream);
2211 
2212 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2213                            struct file *file,
2214                            struct snd_pcm_substream **rsubstream)
2215 {
2216         struct snd_pcm_substream *substream;
2217         int err;
2218 
2219         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2220         if (err < 0)
2221                 return err;
2222         if (substream->ref_count > 1) {
2223                 *rsubstream = substream;
2224                 return 0;
2225         }
2226 
2227         err = snd_pcm_hw_constraints_init(substream);
2228         if (err < 0) {
2229                 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2230                 goto error;
2231         }
2232 
2233         if ((err = substream->ops->open(substream)) < 0)
2234                 goto error;
2235 
2236         substream->hw_opened = 1;
2237 
2238         err = snd_pcm_hw_constraints_complete(substream);
2239         if (err < 0) {
2240                 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2241                 goto error;
2242         }
2243 
2244         *rsubstream = substream;
2245         return 0;
2246 
2247  error:
2248         snd_pcm_release_substream(substream);
2249         return err;
2250 }
2251 
2252 EXPORT_SYMBOL(snd_pcm_open_substream);
2253 
2254 static int snd_pcm_open_file(struct file *file,
2255                              struct snd_pcm *pcm,
2256                              int stream)
2257 {
2258         struct snd_pcm_file *pcm_file;
2259         struct snd_pcm_substream *substream;
2260         int err;
2261 
2262         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2263         if (err < 0)
2264                 return err;
2265 
2266         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2267         if (pcm_file == NULL) {
2268                 snd_pcm_release_substream(substream);
2269                 return -ENOMEM;
2270         }
2271         pcm_file->substream = substream;
2272         if (substream->ref_count == 1) {
2273                 substream->file = pcm_file;
2274                 substream->pcm_release = pcm_release_private;
2275         }
2276         file->private_data = pcm_file;
2277 
2278         return 0;
2279 }
2280 
2281 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2282 {
2283         struct snd_pcm *pcm;
2284         int err = nonseekable_open(inode, file);
2285         if (err < 0)
2286                 return err;
2287         pcm = snd_lookup_minor_data(iminor(inode),
2288                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2289         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2290         if (pcm)
2291                 snd_card_unref(pcm->card);
2292         return err;
2293 }
2294 
2295 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2296 {
2297         struct snd_pcm *pcm;
2298         int err = nonseekable_open(inode, file);
2299         if (err < 0)
2300                 return err;
2301         pcm = snd_lookup_minor_data(iminor(inode),
2302                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2303         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2304         if (pcm)
2305                 snd_card_unref(pcm->card);
2306         return err;
2307 }
2308 
2309 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2310 {
2311         int err;
2312         wait_queue_t wait;
2313 
2314         if (pcm == NULL) {
2315                 err = -ENODEV;
2316                 goto __error1;
2317         }
2318         err = snd_card_file_add(pcm->card, file);
2319         if (err < 0)
2320                 goto __error1;
2321         if (!try_module_get(pcm->card->module)) {
2322                 err = -EFAULT;
2323                 goto __error2;
2324         }
2325         init_waitqueue_entry(&wait, current);
2326         add_wait_queue(&pcm->open_wait, &wait);
2327         mutex_lock(&pcm->open_mutex);
2328         while (1) {
2329                 err = snd_pcm_open_file(file, pcm, stream);
2330                 if (err >= 0)
2331                         break;
2332                 if (err == -EAGAIN) {
2333                         if (file->f_flags & O_NONBLOCK) {
2334                                 err = -EBUSY;
2335                                 break;
2336                         }
2337                 } else
2338                         break;
2339                 set_current_state(TASK_INTERRUPTIBLE);
2340                 mutex_unlock(&pcm->open_mutex);
2341                 schedule();
2342                 mutex_lock(&pcm->open_mutex);
2343                 if (pcm->card->shutdown) {
2344                         err = -ENODEV;
2345                         break;
2346                 }
2347                 if (signal_pending(current)) {
2348                         err = -ERESTARTSYS;
2349                         break;
2350                 }
2351         }
2352         remove_wait_queue(&pcm->open_wait, &wait);
2353         mutex_unlock(&pcm->open_mutex);
2354         if (err < 0)
2355                 goto __error;
2356         return err;
2357 
2358       __error:
2359         module_put(pcm->card->module);
2360       __error2:
2361         snd_card_file_remove(pcm->card, file);
2362       __error1:
2363         return err;
2364 }
2365 
2366 static int snd_pcm_release(struct inode *inode, struct file *file)
2367 {
2368         struct snd_pcm *pcm;
2369         struct snd_pcm_substream *substream;
2370         struct snd_pcm_file *pcm_file;
2371 
2372         pcm_file = file->private_data;
2373         substream = pcm_file->substream;
2374         if (snd_BUG_ON(!substream))
2375                 return -ENXIO;
2376         pcm = substream->pcm;
2377         mutex_lock(&pcm->open_mutex);
2378         snd_pcm_release_substream(substream);
2379         kfree(pcm_file);
2380         mutex_unlock(&pcm->open_mutex);
2381         wake_up(&pcm->open_wait);
2382         module_put(pcm->card->module);
2383         snd_card_file_remove(pcm->card, file);
2384         return 0;
2385 }
2386 
2387 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2388                                                  snd_pcm_uframes_t frames)
2389 {
2390         struct snd_pcm_runtime *runtime = substream->runtime;
2391         snd_pcm_sframes_t appl_ptr;
2392         snd_pcm_sframes_t ret;
2393         snd_pcm_sframes_t hw_avail;
2394 
2395         if (frames == 0)
2396                 return 0;
2397 
2398         snd_pcm_stream_lock_irq(substream);
2399         switch (runtime->status->state) {
2400         case SNDRV_PCM_STATE_PREPARED:
2401                 break;
2402         case SNDRV_PCM_STATE_DRAINING:
2403         case SNDRV_PCM_STATE_RUNNING:
2404                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2405                         break;
2406                 /* Fall through */
2407         case SNDRV_PCM_STATE_XRUN:
2408                 ret = -EPIPE;
2409                 goto __end;
2410         case SNDRV_PCM_STATE_SUSPENDED:
2411                 ret = -ESTRPIPE;
2412                 goto __end;
2413         default:
2414                 ret = -EBADFD;
2415                 goto __end;
2416         }
2417 
2418         hw_avail = snd_pcm_playback_hw_avail(runtime);
2419         if (hw_avail <= 0) {
2420                 ret = 0;
2421                 goto __end;
2422         }
2423         if (frames > (snd_pcm_uframes_t)hw_avail)
2424                 frames = hw_avail;
2425         appl_ptr = runtime->control->appl_ptr - frames;
2426         if (appl_ptr < 0)
2427                 appl_ptr += runtime->boundary;
2428         runtime->control->appl_ptr = appl_ptr;
2429         ret = frames;
2430  __end:
2431         snd_pcm_stream_unlock_irq(substream);
2432         return ret;
2433 }
2434 
2435 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2436                                                 snd_pcm_uframes_t frames)
2437 {
2438         struct snd_pcm_runtime *runtime = substream->runtime;
2439         snd_pcm_sframes_t appl_ptr;
2440         snd_pcm_sframes_t ret;
2441         snd_pcm_sframes_t hw_avail;
2442 
2443         if (frames == 0)
2444                 return 0;
2445 
2446         snd_pcm_stream_lock_irq(substream);
2447         switch (runtime->status->state) {
2448         case SNDRV_PCM_STATE_PREPARED:
2449         case SNDRV_PCM_STATE_DRAINING:
2450                 break;
2451         case SNDRV_PCM_STATE_RUNNING:
2452                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2453                         break;
2454                 /* Fall through */
2455         case SNDRV_PCM_STATE_XRUN:
2456                 ret = -EPIPE;
2457                 goto __end;
2458         case SNDRV_PCM_STATE_SUSPENDED:
2459                 ret = -ESTRPIPE;
2460                 goto __end;
2461         default:
2462                 ret = -EBADFD;
2463                 goto __end;
2464         }
2465 
2466         hw_avail = snd_pcm_capture_hw_avail(runtime);
2467         if (hw_avail <= 0) {
2468                 ret = 0;
2469                 goto __end;
2470         }
2471         if (frames > (snd_pcm_uframes_t)hw_avail)
2472                 frames = hw_avail;
2473         appl_ptr = runtime->control->appl_ptr - frames;
2474         if (appl_ptr < 0)
2475                 appl_ptr += runtime->boundary;
2476         runtime->control->appl_ptr = appl_ptr;
2477         ret = frames;
2478  __end:
2479         snd_pcm_stream_unlock_irq(substream);
2480         return ret;
2481 }
2482 
2483 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2484                                                   snd_pcm_uframes_t frames)
2485 {
2486         struct snd_pcm_runtime *runtime = substream->runtime;
2487         snd_pcm_sframes_t appl_ptr;
2488         snd_pcm_sframes_t ret;
2489         snd_pcm_sframes_t avail;
2490 
2491         if (frames == 0)
2492                 return 0;
2493 
2494         snd_pcm_stream_lock_irq(substream);
2495         switch (runtime->status->state) {
2496         case SNDRV_PCM_STATE_PREPARED:
2497         case SNDRV_PCM_STATE_PAUSED:
2498                 break;
2499         case SNDRV_PCM_STATE_DRAINING:
2500         case SNDRV_PCM_STATE_RUNNING:
2501                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2502                         break;
2503                 /* Fall through */
2504         case SNDRV_PCM_STATE_XRUN:
2505                 ret = -EPIPE;
2506                 goto __end;
2507         case SNDRV_PCM_STATE_SUSPENDED:
2508                 ret = -ESTRPIPE;
2509                 goto __end;
2510         default:
2511                 ret = -EBADFD;
2512                 goto __end;
2513         }
2514 
2515         avail = snd_pcm_playback_avail(runtime);
2516         if (avail <= 0) {
2517                 ret = 0;
2518                 goto __end;
2519         }
2520         if (frames > (snd_pcm_uframes_t)avail)
2521                 frames = avail;
2522         appl_ptr = runtime->control->appl_ptr + frames;
2523         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2524                 appl_ptr -= runtime->boundary;
2525         runtime->control->appl_ptr = appl_ptr;
2526         ret = frames;
2527  __end:
2528         snd_pcm_stream_unlock_irq(substream);
2529         return ret;
2530 }
2531 
2532 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2533                                                  snd_pcm_uframes_t frames)
2534 {
2535         struct snd_pcm_runtime *runtime = substream->runtime;
2536         snd_pcm_sframes_t appl_ptr;
2537         snd_pcm_sframes_t ret;
2538         snd_pcm_sframes_t avail;
2539 
2540         if (frames == 0)
2541                 return 0;
2542 
2543         snd_pcm_stream_lock_irq(substream);
2544         switch (runtime->status->state) {
2545         case SNDRV_PCM_STATE_PREPARED:
2546         case SNDRV_PCM_STATE_DRAINING:
2547         case SNDRV_PCM_STATE_PAUSED:
2548                 break;
2549         case SNDRV_PCM_STATE_RUNNING:
2550                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2551                         break;
2552                 /* Fall through */
2553         case SNDRV_PCM_STATE_XRUN:
2554                 ret = -EPIPE;
2555                 goto __end;
2556         case SNDRV_PCM_STATE_SUSPENDED:
2557                 ret = -ESTRPIPE;
2558                 goto __end;
2559         default:
2560                 ret = -EBADFD;
2561                 goto __end;
2562         }
2563 
2564         avail = snd_pcm_capture_avail(runtime);
2565         if (avail <= 0) {
2566                 ret = 0;
2567                 goto __end;
2568         }
2569         if (frames > (snd_pcm_uframes_t)avail)
2570                 frames = avail;
2571         appl_ptr = runtime->control->appl_ptr + frames;
2572         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2573                 appl_ptr -= runtime->boundary;
2574         runtime->control->appl_ptr = appl_ptr;
2575         ret = frames;
2576  __end:
2577         snd_pcm_stream_unlock_irq(substream);
2578         return ret;
2579 }
2580 
2581 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2582 {
2583         struct snd_pcm_runtime *runtime = substream->runtime;
2584         int err;
2585 
2586         snd_pcm_stream_lock_irq(substream);
2587         switch (runtime->status->state) {
2588         case SNDRV_PCM_STATE_DRAINING:
2589                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2590                         goto __badfd;
2591                 /* Fall through */
2592         case SNDRV_PCM_STATE_RUNNING:
2593                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2594                         break;
2595                 /* Fall through */
2596         case SNDRV_PCM_STATE_PREPARED:
2597         case SNDRV_PCM_STATE_SUSPENDED:
2598                 err = 0;
2599                 break;
2600         case SNDRV_PCM_STATE_XRUN:
2601                 err = -EPIPE;
2602                 break;
2603         default:
2604               __badfd:
2605                 err = -EBADFD;
2606                 break;
2607         }
2608         snd_pcm_stream_unlock_irq(substream);
2609         return err;
2610 }
2611                 
2612 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2613                          snd_pcm_sframes_t __user *res)
2614 {
2615         struct snd_pcm_runtime *runtime = substream->runtime;
2616         int err;
2617         snd_pcm_sframes_t n = 0;
2618 
2619         snd_pcm_stream_lock_irq(substream);
2620         switch (runtime->status->state) {
2621         case SNDRV_PCM_STATE_DRAINING:
2622                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2623                         goto __badfd;
2624                 /* Fall through */
2625         case SNDRV_PCM_STATE_RUNNING:
2626                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2627                         break;
2628                 /* Fall through */
2629         case SNDRV_PCM_STATE_PREPARED:
2630         case SNDRV_PCM_STATE_SUSPENDED:
2631                 err = 0;
2632                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2633                         n = snd_pcm_playback_hw_avail(runtime);
2634                 else
2635                         n = snd_pcm_capture_avail(runtime);
2636                 n += runtime->delay;
2637                 break;
2638         case SNDRV_PCM_STATE_XRUN:
2639                 err = -EPIPE;
2640                 break;
2641         default:
2642               __badfd:
2643                 err = -EBADFD;
2644                 break;
2645         }
2646         snd_pcm_stream_unlock_irq(substream);
2647         if (!err)
2648                 if (put_user(n, res))
2649                         err = -EFAULT;
2650         return err;
2651 }
2652                 
2653 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2654                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2655 {
2656         struct snd_pcm_runtime *runtime = substream->runtime;
2657         struct snd_pcm_sync_ptr sync_ptr;
2658         volatile struct snd_pcm_mmap_status *status;
2659         volatile struct snd_pcm_mmap_control *control;
2660         int err;
2661 
2662         memset(&sync_ptr, 0, sizeof(sync_ptr));
2663         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2664                 return -EFAULT;
2665         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2666                 return -EFAULT; 
2667         status = runtime->status;
2668         control = runtime->control;
2669         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2670                 err = snd_pcm_hwsync(substream);
2671                 if (err < 0)
2672                         return err;
2673         }
2674         snd_pcm_stream_lock_irq(substream);
2675         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2676                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2677         else
2678                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2679         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2680                 control->avail_min = sync_ptr.c.control.avail_min;
2681         else
2682                 sync_ptr.c.control.avail_min = control->avail_min;
2683         sync_ptr.s.status.state = status->state;
2684         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2685         sync_ptr.s.status.tstamp = status->tstamp;
2686         sync_ptr.s.status.suspended_state = status->suspended_state;
2687         snd_pcm_stream_unlock_irq(substream);
2688         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2689                 return -EFAULT;
2690         return 0;
2691 }
2692 
2693 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2694 {
2695         struct snd_pcm_runtime *runtime = substream->runtime;
2696         int arg;
2697         
2698         if (get_user(arg, _arg))
2699                 return -EFAULT;
2700         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2701                 return -EINVAL;
2702         runtime->tstamp_type = arg;
2703         return 0;
2704 }
2705                 
2706 static int snd_pcm_common_ioctl1(struct file *file,
2707                                  struct snd_pcm_substream *substream,
2708                                  unsigned int cmd, void __user *arg)
2709 {
2710         switch (cmd) {
2711         case SNDRV_PCM_IOCTL_PVERSION:
2712                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2713         case SNDRV_PCM_IOCTL_INFO:
2714                 return snd_pcm_info_user(substream, arg);
2715         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2716                 return 0;
2717         case SNDRV_PCM_IOCTL_TTSTAMP:
2718                 return snd_pcm_tstamp(substream, arg);
2719         case SNDRV_PCM_IOCTL_HW_REFINE:
2720                 return snd_pcm_hw_refine_user(substream, arg);
2721         case SNDRV_PCM_IOCTL_HW_PARAMS:
2722                 return snd_pcm_hw_params_user(substream, arg);
2723         case SNDRV_PCM_IOCTL_HW_FREE:
2724                 return snd_pcm_hw_free(substream);
2725         case SNDRV_PCM_IOCTL_SW_PARAMS:
2726                 return snd_pcm_sw_params_user(substream, arg);
2727         case SNDRV_PCM_IOCTL_STATUS:
2728                 return snd_pcm_status_user(substream, arg);
2729         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2730                 return snd_pcm_channel_info_user(substream, arg);
2731         case SNDRV_PCM_IOCTL_PREPARE:
2732                 return snd_pcm_prepare(substream, file);
2733         case SNDRV_PCM_IOCTL_RESET:
2734                 return snd_pcm_reset(substream);
2735         case SNDRV_PCM_IOCTL_START:
2736                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2737         case SNDRV_PCM_IOCTL_LINK:
2738                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2739         case SNDRV_PCM_IOCTL_UNLINK:
2740                 return snd_pcm_unlink(substream);
2741         case SNDRV_PCM_IOCTL_RESUME:
2742                 return snd_pcm_resume(substream);
2743         case SNDRV_PCM_IOCTL_XRUN:
2744                 return snd_pcm_xrun(substream);
2745         case SNDRV_PCM_IOCTL_HWSYNC:
2746                 return snd_pcm_hwsync(substream);
2747         case SNDRV_PCM_IOCTL_DELAY:
2748                 return snd_pcm_delay(substream, arg);
2749         case SNDRV_PCM_IOCTL_SYNC_PTR:
2750                 return snd_pcm_sync_ptr(substream, arg);
2751 #ifdef CONFIG_SND_SUPPORT_OLD_API
2752         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2753                 return snd_pcm_hw_refine_old_user(substream, arg);
2754         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2755                 return snd_pcm_hw_params_old_user(substream, arg);
2756 #endif
2757         case SNDRV_PCM_IOCTL_DRAIN:
2758                 return snd_pcm_drain(substream, file);
2759         case SNDRV_PCM_IOCTL_DROP:
2760                 return snd_pcm_drop(substream);
2761         case SNDRV_PCM_IOCTL_PAUSE:
2762         {
2763                 int res;
2764                 snd_pcm_stream_lock_irq(substream);
2765                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2766                 snd_pcm_stream_unlock_irq(substream);
2767                 return res;
2768         }
2769         }
2770         pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2771         return -ENOTTY;
2772 }
2773 
2774 static int snd_pcm_playback_ioctl1(struct file *file,
2775                                    struct snd_pcm_substream *substream,
2776                                    unsigned int cmd, void __user *arg)
2777 {
2778         if (snd_BUG_ON(!substream))
2779                 return -ENXIO;
2780         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2781                 return -EINVAL;
2782         switch (cmd) {
2783         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2784         {
2785                 struct snd_xferi xferi;
2786                 struct snd_xferi __user *_xferi = arg;
2787                 struct snd_pcm_runtime *runtime = substream->runtime;
2788                 snd_pcm_sframes_t result;
2789                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2790                         return -EBADFD;
2791                 if (put_user(0, &_xferi->result))
2792                         return -EFAULT;
2793                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2794                         return -EFAULT;
2795                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2796                 __put_user(result, &_xferi->result);
2797                 return result < 0 ? result : 0;
2798         }
2799         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2800         {
2801                 struct snd_xfern xfern;
2802                 struct snd_xfern __user *_xfern = arg;
2803                 struct snd_pcm_runtime *runtime = substream->runtime;
2804                 void __user **bufs;
2805                 snd_pcm_sframes_t result;
2806                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2807                         return -EBADFD;
2808                 if (runtime->channels > 128)
2809                         return -EINVAL;
2810                 if (put_user(0, &_xfern->result))
2811                         return -EFAULT;
2812                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2813                         return -EFAULT;
2814 
2815                 bufs = memdup_user(xfern.bufs,
2816                                    sizeof(void *) * runtime->channels);
2817                 if (IS_ERR(bufs))
2818                         return PTR_ERR(bufs);
2819                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2820                 kfree(bufs);
2821                 __put_user(result, &_xfern->result);
2822                 return result < 0 ? result : 0;
2823         }
2824         case SNDRV_PCM_IOCTL_REWIND:
2825         {
2826                 snd_pcm_uframes_t frames;
2827                 snd_pcm_uframes_t __user *_frames = arg;
2828                 snd_pcm_sframes_t result;
2829                 if (get_user(frames, _frames))
2830                         return -EFAULT;
2831                 if (put_user(0, _frames))
2832                         return -EFAULT;
2833                 result = snd_pcm_playback_rewind(substream, frames);
2834                 __put_user(result, _frames);
2835                 return result < 0 ? result : 0;
2836         }
2837         case SNDRV_PCM_IOCTL_FORWARD:
2838         {
2839                 snd_pcm_uframes_t frames;
2840                 snd_pcm_uframes_t __user *_frames = arg;
2841                 snd_pcm_sframes_t result;
2842                 if (get_user(frames, _frames))
2843                         return -EFAULT;
2844                 if (put_user(0, _frames))
2845                         return -EFAULT;
2846                 result = snd_pcm_playback_forward(substream, frames);
2847                 __put_user(result, _frames);
2848                 return result < 0 ? result : 0;
2849         }
2850         }
2851         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2852 }
2853 
2854 static int snd_pcm_capture_ioctl1(struct file *file,
2855                                   struct snd_pcm_substream *substream,
2856                                   unsigned int cmd, void __user *arg)
2857 {
2858         if (snd_BUG_ON(!substream))
2859                 return -ENXIO;
2860         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2861                 return -EINVAL;
2862         switch (cmd) {
2863         case SNDRV_PCM_IOCTL_READI_FRAMES:
2864         {
2865                 struct snd_xferi xferi;
2866                 struct snd_xferi __user *_xferi = arg;
2867                 struct snd_pcm_runtime *runtime = substream->runtime;
2868                 snd_pcm_sframes_t result;
2869                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2870                         return -EBADFD;
2871                 if (put_user(0, &_xferi->result))
2872                         return -EFAULT;
2873                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2874                         return -EFAULT;
2875                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2876                 __put_user(result, &_xferi->result);
2877                 return result < 0 ? result : 0;
2878         }
2879         case SNDRV_PCM_IOCTL_READN_FRAMES:
2880         {
2881                 struct snd_xfern xfern;
2882                 struct snd_xfern __user *_xfern = arg;
2883                 struct snd_pcm_runtime *runtime = substream->runtime;
2884                 void *bufs;
2885                 snd_pcm_sframes_t result;
2886                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2887                         return -EBADFD;
2888                 if (runtime->channels > 128)
2889                         return -EINVAL;
2890                 if (put_user(0, &_xfern->result))
2891                         return -EFAULT;
2892                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2893                         return -EFAULT;
2894 
2895                 bufs = memdup_user(xfern.bufs,
2896                                    sizeof(void *) * runtime->channels);
2897                 if (IS_ERR(bufs))
2898                         return PTR_ERR(bufs);
2899                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2900                 kfree(bufs);
2901                 __put_user(result, &_xfern->result);
2902                 return result < 0 ? result : 0;
2903         }
2904         case SNDRV_PCM_IOCTL_REWIND:
2905         {
2906                 snd_pcm_uframes_t frames;
2907                 snd_pcm_uframes_t __user *_frames = arg;
2908                 snd_pcm_sframes_t result;
2909                 if (get_user(frames, _frames))
2910                         return -EFAULT;
2911                 if (put_user(0, _frames))
2912                         return -EFAULT;
2913                 result = snd_pcm_capture_rewind(substream, frames);
2914                 __put_user(result, _frames);
2915                 return result < 0 ? result : 0;
2916         }
2917         case SNDRV_PCM_IOCTL_FORWARD:
2918         {
2919                 snd_pcm_uframes_t frames;
2920                 snd_pcm_uframes_t __user *_frames = arg;
2921                 snd_pcm_sframes_t result;
2922                 if (get_user(frames, _frames))
2923                         return -EFAULT;
2924                 if (put_user(0, _frames))
2925                         return -EFAULT;
2926                 result = snd_pcm_capture_forward(substream, frames);
2927                 __put_user(result, _frames);
2928                 return result < 0 ? result : 0;
2929         }
2930         }
2931         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2932 }
2933 
2934 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2935                                    unsigned long arg)
2936 {
2937         struct snd_pcm_file *pcm_file;
2938 
2939         pcm_file = file->private_data;
2940 
2941         if (((cmd >> 8) & 0xff) != 'A')
2942                 return -ENOTTY;
2943 
2944         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2945                                        (void __user *)arg);
2946 }
2947 
2948 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2949                                   unsigned long arg)
2950 {
2951         struct snd_pcm_file *pcm_file;
2952 
2953         pcm_file = file->private_data;
2954 
2955         if (((cmd >> 8) & 0xff) != 'A')
2956                 return -ENOTTY;
2957 
2958         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2959                                       (void __user *)arg);
2960 }
2961 
2962 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2963                          unsigned int cmd, void *arg)
2964 {
2965         mm_segment_t fs;
2966         int result;
2967         
2968         fs = snd_enter_user();
2969         switch (substream->stream) {
2970         case SNDRV_PCM_STREAM_PLAYBACK:
2971                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2972                                                  (void __user *)arg);
2973                 break;
2974         case SNDRV_PCM_STREAM_CAPTURE:
2975                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2976                                                 (void __user *)arg);
2977                 break;
2978         default:
2979                 result = -EINVAL;
2980                 break;
2981         }
2982         snd_leave_user(fs);
2983         return result;
2984 }
2985 
2986 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2987 
2988 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2989                             loff_t * offset)
2990 {
2991         struct snd_pcm_file *pcm_file;
2992         struct snd_pcm_substream *substream;
2993         struct snd_pcm_runtime *runtime;
2994         snd_pcm_sframes_t result;
2995 
2996         pcm_file = file->private_data;
2997         substream = pcm_file->substream;
2998         if (PCM_RUNTIME_CHECK(substream))
2999                 return -ENXIO;
3000         runtime = substream->runtime;
3001         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3002                 return -EBADFD;
3003         if (!frame_aligned(runtime, count))
3004                 return -EINVAL;
3005         count = bytes_to_frames(runtime, count);
3006         result = snd_pcm_lib_read(substream, buf, count);
3007         if (result > 0)
3008                 result = frames_to_bytes(runtime, result);
3009         return result;
3010 }
3011 
3012 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3013                              size_t count, loff_t * offset)
3014 {
3015         struct snd_pcm_file *pcm_file;
3016         struct snd_pcm_substream *substream;
3017         struct snd_pcm_runtime *runtime;
3018         snd_pcm_sframes_t result;
3019 
3020         pcm_file = file->private_data;
3021         substream = pcm_file->substream;
3022         if (PCM_RUNTIME_CHECK(substream))
3023                 return -ENXIO;
3024         runtime = substream->runtime;
3025         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3026                 return -EBADFD;
3027         if (!frame_aligned(runtime, count))
3028                 return -EINVAL;
3029         count = bytes_to_frames(runtime, count);
3030         result = snd_pcm_lib_write(substream, buf, count);
3031         if (result > 0)
3032                 result = frames_to_bytes(runtime, result);
3033         return result;
3034 }
3035 
3036 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
3037                              unsigned long nr_segs, loff_t pos)
3038 
3039 {
3040         struct snd_pcm_file *pcm_file;
3041         struct snd_pcm_substream *substream;
3042         struct snd_pcm_runtime *runtime;
3043         snd_pcm_sframes_t result;
3044         unsigned long i;
3045         void __user **bufs;
3046         snd_pcm_uframes_t frames;
3047 
3048         pcm_file = iocb->ki_filp->private_data;
3049         substream = pcm_file->substream;
3050         if (PCM_RUNTIME_CHECK(substream))
3051                 return -ENXIO;
3052         runtime = substream->runtime;
3053         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3054                 return -EBADFD;
3055         if (nr_segs > 1024 || nr_segs != runtime->channels)
3056                 return -EINVAL;
3057         if (!frame_aligned(runtime, iov->iov_len))
3058                 return -EINVAL;
3059         frames = bytes_to_samples(runtime, iov->iov_len);
3060         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
3061         if (bufs == NULL)
3062                 return -ENOMEM;
3063         for (i = 0; i < nr_segs; ++i)
3064                 bufs[i] = iov[i].iov_base;
3065         result = snd_pcm_lib_readv(substream, bufs, frames);
3066         if (result > 0)
3067                 result = frames_to_bytes(runtime, result);
3068         kfree(bufs);
3069         return result;
3070 }
3071 
3072 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
3073                               unsigned long nr_segs, loff_t pos)
3074 {
3075         struct snd_pcm_file *pcm_file;
3076         struct snd_pcm_substream *substream;
3077         struct snd_pcm_runtime *runtime;
3078         snd_pcm_sframes_t result;
3079         unsigned long i;
3080         void __user **bufs;
3081         snd_pcm_uframes_t frames;
3082 
3083         pcm_file = iocb->ki_filp->private_data;
3084         substream = pcm_file->substream;
3085         if (PCM_RUNTIME_CHECK(substream))
3086                 return -ENXIO;
3087         runtime = substream->runtime;
3088         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3089                 return -EBADFD;
3090         if (nr_segs > 128 || nr_segs != runtime->channels ||
3091             !frame_aligned(runtime, iov->iov_len))
3092                 return -EINVAL;
3093         frames = bytes_to_samples(runtime, iov->iov_len);
3094         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
3095         if (bufs == NULL)
3096                 return -ENOMEM;
3097         for (i = 0; i < nr_segs; ++i)
3098                 bufs[i] = iov[i].iov_base;
3099         result = snd_pcm_lib_writev(substream, bufs, frames);
3100         if (result > 0)
3101                 result = frames_to_bytes(runtime, result);
3102         kfree(bufs);
3103         return result;
3104 }
3105 
3106 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
3107 {
3108         struct snd_pcm_file *pcm_file;
3109         struct snd_pcm_substream *substream;
3110         struct snd_pcm_runtime *runtime;
3111         unsigned int mask;
3112         snd_pcm_uframes_t avail;
3113 
3114         pcm_file = file->private_data;
3115 
3116         substream = pcm_file->substream;
3117         if (PCM_RUNTIME_CHECK(substream))
3118                 return -ENXIO;
3119         runtime = substream->runtime;
3120 
3121         poll_wait(file, &runtime->sleep, wait);
3122 
3123         snd_pcm_stream_lock_irq(substream);
3124         avail = snd_pcm_playback_avail(runtime);
3125         switch (runtime->status->state) {
3126         case SNDRV_PCM_STATE_RUNNING:
3127         case SNDRV_PCM_STATE_PREPARED:
3128         case SNDRV_PCM_STATE_PAUSED:
3129                 if (avail >= runtime->control->avail_min) {
3130                         mask = POLLOUT | POLLWRNORM;
3131                         break;
3132                 }
3133                 /* Fall through */
3134         case SNDRV_PCM_STATE_DRAINING:
3135                 mask = 0;
3136                 break;
3137         default:
3138                 mask = POLLOUT | POLLWRNORM | POLLERR;
3139                 break;
3140         }
3141         snd_pcm_stream_unlock_irq(substream);
3142         return mask;
3143 }
3144 
3145 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
3146 {
3147         struct snd_pcm_file *pcm_file;
3148         struct snd_pcm_substream *substream;
3149         struct snd_pcm_runtime *runtime;
3150         unsigned int mask;
3151         snd_pcm_uframes_t avail;
3152 
3153         pcm_file = file->private_data;
3154 
3155         substream = pcm_file->substream;
3156         if (PCM_RUNTIME_CHECK(substream))
3157                 return -ENXIO;
3158         runtime = substream->runtime;
3159 
3160         poll_wait(file, &runtime->sleep, wait);
3161 
3162         snd_pcm_stream_lock_irq(substream);
3163         avail = snd_pcm_capture_avail(runtime);
3164         switch (runtime->status->state) {
3165         case SNDRV_PCM_STATE_RUNNING:
3166         case SNDRV_PCM_STATE_PREPARED:
3167         case SNDRV_PCM_STATE_PAUSED:
3168                 if (avail >= runtime->control->avail_min) {
3169                         mask = POLLIN | POLLRDNORM;
3170                         break;
3171                 }
3172                 mask = 0;
3173                 break;
3174         case SNDRV_PCM_STATE_DRAINING:
3175                 if (avail > 0) {
3176                         mask = POLLIN | POLLRDNORM;
3177                         break;
3178                 }
3179                 /* Fall through */
3180         default:
3181                 mask = POLLIN | POLLRDNORM | POLLERR;
3182                 break;
3183         }
3184         snd_pcm_stream_unlock_irq(substream);
3185         return mask;
3186 }
3187 
3188 /*
3189  * mmap support
3190  */
3191 
3192 /*
3193  * Only on coherent architectures, we can mmap the status and the control records
3194  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3195  */
3196 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3197 /*
3198  * mmap status record
3199  */
3200 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3201                                                 struct vm_fault *vmf)
3202 {
3203         struct snd_pcm_substream *substream = area->vm_private_data;
3204         struct snd_pcm_runtime *runtime;
3205         
3206         if (substream == NULL)
3207                 return VM_FAULT_SIGBUS;
3208         runtime = substream->runtime;
3209         vmf->page = virt_to_page(runtime->status);
3210         get_page(vmf->page);
3211         return 0;
3212 }
3213 
3214 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3215 {
3216         .fault =        snd_pcm_mmap_status_fault,
3217 };
3218 
3219 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3220                                struct vm_area_struct *area)
3221 {
3222         long size;
3223         if (!(area->vm_flags & VM_READ))
3224                 return -EINVAL;
3225         size = area->vm_end - area->vm_start;
3226         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3227                 return -EINVAL;
3228         area->vm_ops = &snd_pcm_vm_ops_status;
3229         area->vm_private_data = substream;
3230         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3231         return 0;
3232 }
3233 
3234 /*
3235  * mmap control record
3236  */
3237 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3238                                                 struct vm_fault *vmf)
3239 {
3240         struct snd_pcm_substream *substream = area->vm_private_data;
3241         struct snd_pcm_runtime *runtime;
3242         
3243         if (substream == NULL)
3244                 return VM_FAULT_SIGBUS;
3245         runtime = substream->runtime;
3246         vmf->page = virt_to_page(runtime->control);
3247         get_page(vmf->page);
3248         return 0;
3249 }
3250 
3251 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3252 {
3253         .fault =        snd_pcm_mmap_control_fault,
3254 };
3255 
3256 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3257                                 struct vm_area_struct *area)
3258 {
3259         long size;
3260         if (!(area->vm_flags & VM_READ))
3261                 return -EINVAL;
3262         size = area->vm_end - area->vm_start;
3263         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3264                 return -EINVAL;
3265         area->vm_ops = &snd_pcm_vm_ops_control;
3266         area->vm_private_data = substream;
3267         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3268         return 0;
3269 }
3270 #else /* ! coherent mmap */
3271 /*
3272  * don't support mmap for status and control records.
3273  */
3274 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3275                                struct vm_area_struct *area)
3276 {
3277         return -ENXIO;
3278 }
3279 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3280                                 struct vm_area_struct *area)
3281 {
3282         return -ENXIO;
3283 }
3284 #endif /* coherent mmap */
3285 
3286 static inline struct page *
3287 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3288 {
3289         void *vaddr = substream->runtime->dma_area + ofs;
3290         return virt_to_page(vaddr);
3291 }
3292 
3293 /*
3294  * fault callback for mmapping a RAM page
3295  */
3296 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3297                                                 struct vm_fault *vmf)
3298 {
3299         struct snd_pcm_substream *substream = area->vm_private_data;
3300         struct snd_pcm_runtime *runtime;
3301         unsigned long offset;
3302         struct page * page;
3303         size_t dma_bytes;
3304         
3305         if (substream == NULL)
3306                 return VM_FAULT_SIGBUS;
3307         runtime = substream->runtime;
3308         offset = vmf->pgoff << PAGE_SHIFT;
3309         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3310         if (offset > dma_bytes - PAGE_SIZE)
3311                 return VM_FAULT_SIGBUS;
3312         if (substream->ops->page)
3313                 page = substream->ops->page(substream, offset);
3314         else
3315                 page = snd_pcm_default_page_ops(substream, offset);
3316         if (!page)
3317                 return VM_FAULT_SIGBUS;
3318         get_page(page);
3319         vmf->page = page;
3320         return 0;
3321 }
3322 
3323 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3324         .open =         snd_pcm_mmap_data_open,
3325         .close =        snd_pcm_mmap_data_close,
3326 };
3327 
3328 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3329         .open =         snd_pcm_mmap_data_open,
3330         .close =        snd_pcm_mmap_data_close,
3331         .fault =        snd_pcm_mmap_data_fault,
3332 };
3333 
3334 /*
3335  * mmap the DMA buffer on RAM
3336  */
3337 
3338 /**
3339  * snd_pcm_lib_default_mmap - Default PCM data mmap function
3340  * @substream: PCM substream
3341  * @area: VMA
3342  *
3343  * This is the default mmap handler for PCM data.  When mmap pcm_ops is NULL,
3344  * this function is invoked implicitly.
3345  */
3346 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3347                              struct vm_area_struct *area)
3348 {
3349         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3350 #ifdef CONFIG_GENERIC_ALLOCATOR
3351         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3352                 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3353                 return remap_pfn_range(area, area->vm_start,
3354                                 substream->dma_buffer.addr >> PAGE_SHIFT,
3355                                 area->vm_end - area->vm_start, area->vm_page_prot);
3356         }
3357 #endif /* CONFIG_GENERIC_ALLOCATOR */
3358 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
3359         if (!substream->ops->page &&
3360             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3361                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3362                                          area,
3363                                          substream->runtime->dma_area,
3364                                          substream->runtime->dma_addr,
3365                                          area->vm_end - area->vm_start);
3366 #endif /* CONFIG_X86 */
3367         /* mmap with fault handler */
3368         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3369         return 0;
3370 }
3371 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3372 
3373 /*
3374  * mmap the DMA buffer on I/O memory area
3375  */
3376 #if SNDRV_PCM_INFO_MMAP_IOMEM
3377 /**
3378  * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3379  * @substream: PCM substream
3380  * @area: VMA
3381  *
3382  * When your hardware uses the iomapped pages as the hardware buffer and
3383  * wants to mmap it, pass this function as mmap pcm_ops.  Note that this
3384  * is supposed to work only on limited architectures.
3385  */
3386 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3387                            struct vm_area_struct *area)
3388 {
3389         struct snd_pcm_runtime *runtime = substream->runtime;;
3390 
3391         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3392         return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3393 }
3394 
3395 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3396 #endif /* SNDRV_PCM_INFO_MMAP */
3397 
3398 /*
3399  * mmap DMA buffer
3400  */
3401 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3402                       struct vm_area_struct *area)
3403 {
3404         struct snd_pcm_runtime *runtime;
3405         long size;
3406         unsigned long offset;
3407         size_t dma_bytes;
3408         int err;
3409 
3410         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3411                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3412                         return -EINVAL;
3413         } else {
3414                 if (!(area->vm_flags & VM_READ))
3415                         return -EINVAL;
3416         }
3417         runtime = substream->runtime;
3418         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3419                 return -EBADFD;
3420         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3421                 return -ENXIO;
3422         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3423             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3424                 return -EINVAL;
3425         size = area->vm_end - area->vm_start;
3426         offset = area->vm_pgoff << PAGE_SHIFT;
3427         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3428         if ((size_t)size > dma_bytes)
3429                 return -EINVAL;
3430         if (offset > dma_bytes - size)
3431                 return -EINVAL;
3432 
3433         area->vm_ops = &snd_pcm_vm_ops_data;
3434         area->vm_private_data = substream;
3435         if (substream->ops->mmap)
3436                 err = substream->ops->mmap(substream, area);
3437         else
3438                 err = snd_pcm_lib_default_mmap(substream, area);
3439         if (!err)
3440                 atomic_inc(&substream->mmap_count);
3441         return err;
3442 }
3443 
3444 EXPORT_SYMBOL(snd_pcm_mmap_data);
3445 
3446 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3447 {
3448         struct snd_pcm_file * pcm_file;
3449         struct snd_pcm_substream *substream;    
3450         unsigned long offset;
3451         
3452         pcm_file = file->private_data;
3453         substream = pcm_file->substream;
3454         if (PCM_RUNTIME_CHECK(substream))
3455                 return -ENXIO;
3456 
3457         offset = area->vm_pgoff << PAGE_SHIFT;
3458         switch (offset) {
3459         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3460                 if (pcm_file->no_compat_mmap)
3461                         return -ENXIO;
3462                 return snd_pcm_mmap_status(substream, file, area);
3463         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3464                 if (pcm_file->no_compat_mmap)
3465                         return -ENXIO;
3466                 return snd_pcm_mmap_control(substream, file, area);
3467         default:
3468                 return snd_pcm_mmap_data(substream, file, area);
3469         }
3470         return 0;
3471 }
3472 
3473 static int snd_pcm_fasync(int fd, struct file * file, int on)
3474 {
3475         struct snd_pcm_file * pcm_file;
3476         struct snd_pcm_substream *substream;
3477         struct snd_pcm_runtime *runtime;
3478 
3479         pcm_file = file->private_data;
3480         substream = pcm_file->substream;
3481         if (PCM_RUNTIME_CHECK(substream))
3482                 return -ENXIO;
3483         runtime = substream->runtime;
3484         return fasync_helper(fd, file, on, &runtime->fasync);
3485 }
3486 
3487 /*
3488  * ioctl32 compat
3489  */
3490 #ifdef CONFIG_COMPAT
3491 #include "pcm_compat.c"
3492 #else
3493 #define snd_pcm_ioctl_compat    NULL
3494 #endif
3495 
3496 /*
3497  *  To be removed helpers to keep binary compatibility
3498  */
3499 
3500 #ifdef CONFIG_SND_SUPPORT_OLD_API
3501 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3502 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3503 
3504 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3505                                                struct snd_pcm_hw_params_old *oparams)
3506 {
3507         unsigned int i;
3508 
3509         memset(params, 0, sizeof(*params));
3510         params->flags = oparams->flags;
3511         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3512                 params->masks[i].bits[0] = oparams->masks[i];
3513         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3514         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3515         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3516         params->info = oparams->info;
3517         params->msbits = oparams->msbits;
3518         params->rate_num = oparams->rate_num;
3519         params->rate_den = oparams->rate_den;
3520         params->fifo_size = oparams->fifo_size;
3521 }
3522 
3523 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3524                                              struct snd_pcm_hw_params *params)
3525 {
3526         unsigned int i;
3527 
3528         memset(oparams, 0, sizeof(*oparams));
3529         oparams->flags = params->flags;
3530         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3531                 oparams->masks[i] = params->masks[i].bits[0];
3532         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3533         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3534         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3535         oparams->info = params->info;
3536         oparams->msbits = params->msbits;
3537         oparams->rate_num = params->rate_num;
3538         oparams->rate_den = params->rate_den;
3539         oparams->fifo_size = params->fifo_size;
3540 }
3541 
3542 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3543                                       struct snd_pcm_hw_params_old __user * _oparams)
3544 {
3545         struct snd_pcm_hw_params *params;
3546         struct snd_pcm_hw_params_old *oparams = NULL;
3547         int err;
3548 
3549         params = kmalloc(sizeof(*params), GFP_KERNEL);
3550         if (!params)
3551                 return -ENOMEM;
3552 
3553         oparams = memdup_user(_oparams, sizeof(*oparams));
3554         if (IS_ERR(oparams)) {
3555                 err = PTR_ERR(oparams);
3556                 goto out;
3557         }
3558         snd_pcm_hw_convert_from_old_params(params, oparams);
3559         err = snd_pcm_hw_refine(substream, params);
3560         snd_pcm_hw_convert_to_old_params(oparams, params);
3561         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3562                 if (!err)
3563                         err = -EFAULT;
3564         }
3565 
3566         kfree(oparams);
3567 out:
3568         kfree(params);
3569         return err;
3570 }
3571 
3572 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3573                                       struct snd_pcm_hw_params_old __user * _oparams)
3574 {
3575         struct snd_pcm_hw_params *params;
3576         struct snd_pcm_hw_params_old *oparams = NULL;
3577         int err;
3578 
3579         params = kmalloc(sizeof(*params), GFP_KERNEL);
3580         if (!params)
3581                 return -ENOMEM;
3582 
3583         oparams = memdup_user(_oparams, sizeof(*oparams));
3584         if (IS_ERR(oparams)) {
3585                 err = PTR_ERR(oparams);
3586                 goto out;
3587         }
3588         snd_pcm_hw_convert_from_old_params(params, oparams);
3589         err = snd_pcm_hw_params(substream, params);
3590         snd_pcm_hw_convert_to_old_params(oparams, params);
3591         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3592                 if (!err)
3593                         err = -EFAULT;
3594         }
3595 
3596         kfree(oparams);
3597 out:
3598         kfree(params);
3599         return err;
3600 }
3601 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3602 
3603 #ifndef CONFIG_MMU
3604 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3605                                                unsigned long addr,
3606                                                unsigned long len,
3607                                                unsigned long pgoff,
3608                                                unsigned long flags)
3609 {
3610         struct snd_pcm_file *pcm_file = file->private_data;
3611         struct snd_pcm_substream *substream = pcm_file->substream;
3612         struct snd_pcm_runtime *runtime = substream->runtime;
3613         unsigned long offset = pgoff << PAGE_SHIFT;
3614 
3615         switch (offset) {
3616         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3617                 return (unsigned long)runtime->status;
3618         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3619                 return (unsigned long)runtime->control;
3620         default:
3621                 return (unsigned long)runtime->dma_area + offset;
3622         }
3623 }
3624 #else
3625 # define snd_pcm_get_unmapped_area NULL
3626 #endif
3627 
3628 /*
3629  *  Register section
3630  */
3631 
3632 const struct file_operations snd_pcm_f_ops[2] = {
3633         {
3634                 .owner =                THIS_MODULE,
3635                 .write =                snd_pcm_write,
3636                 .aio_write =            snd_pcm_aio_write,
3637                 .open =                 snd_pcm_playback_open,
3638                 .release =              snd_pcm_release,
3639                 .llseek =               no_llseek,
3640                 .poll =                 snd_pcm_playback_poll,
3641                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3642                 .compat_ioctl =         snd_pcm_ioctl_compat,
3643                 .mmap =                 snd_pcm_mmap,
3644                 .fasync =               snd_pcm_fasync,
3645                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3646         },
3647         {
3648                 .owner =                THIS_MODULE,
3649                 .read =                 snd_pcm_read,
3650                 .aio_read =             snd_pcm_aio_read,
3651                 .open =                 snd_pcm_capture_open,
3652                 .release =              snd_pcm_release,
3653                 .llseek =               no_llseek,
3654                 .poll =                 snd_pcm_capture_poll,
3655                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3656                 .compat_ioctl =         snd_pcm_ioctl_compat,
3657                 .mmap =                 snd_pcm_mmap,
3658                 .fasync =               snd_pcm_fasync,
3659                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3660         }
3661 };
3662 

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