ALSA: PCM - Don't check DMA time-out too shortly
[linux-2.6.git] / sound / core / pcm_native.c
1 /*
2  *  Digital Audio (PCM) abstract layer
3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4  *
5  *
6  *   This program is free software; you can redistribute it and/or modify
7  *   it under the terms of the GNU General Public License as published by
8  *   the Free Software Foundation; either version 2 of the License, or
9  *   (at your option) any later version.
10  *
11  *   This program is distributed in the hope that it will be useful,
12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *   GNU General Public License for more details.
15  *
16  *   You should have received a copy of the GNU General Public License
17  *   along with this program; if not, write to the Free Software
18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
19  *
20  */
21
22 #include <linux/mm.h>
23 #include <linux/file.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/pm_qos_params.h>
27 #include <linux/uio.h>
28 #include <linux/dma-mapping.h>
29 #include <sound/core.h>
30 #include <sound/control.h>
31 #include <sound/info.h>
32 #include <sound/pcm.h>
33 #include <sound/pcm_params.h>
34 #include <sound/timer.h>
35 #include <sound/minors.h>
36 #include <asm/io.h>
37 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
38 #include <dma-coherence.h>
39 #endif
40
41 /*
42  *  Compatibility
43  */
44
45 struct snd_pcm_hw_params_old {
46         unsigned int flags;
47         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
48                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
49         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
50                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
51         unsigned int rmask;
52         unsigned int cmask;
53         unsigned int info;
54         unsigned int msbits;
55         unsigned int rate_num;
56         unsigned int rate_den;
57         snd_pcm_uframes_t fifo_size;
58         unsigned char reserved[64];
59 };
60
61 #ifdef CONFIG_SND_SUPPORT_OLD_API
62 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
63 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
64
65 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
66                                       struct snd_pcm_hw_params_old __user * _oparams);
67 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
68                                       struct snd_pcm_hw_params_old __user * _oparams);
69 #endif
70 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
71
72 /*
73  *
74  */
75
76 DEFINE_RWLOCK(snd_pcm_link_rwlock);
77 EXPORT_SYMBOL(snd_pcm_link_rwlock);
78
79 static DECLARE_RWSEM(snd_pcm_link_rwsem);
80
81 static inline mm_segment_t snd_enter_user(void)
82 {
83         mm_segment_t fs = get_fs();
84         set_fs(get_ds());
85         return fs;
86 }
87
88 static inline void snd_leave_user(mm_segment_t fs)
89 {
90         set_fs(fs);
91 }
92
93
94
95 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
96 {
97         struct snd_pcm_runtime *runtime;
98         struct snd_pcm *pcm = substream->pcm;
99         struct snd_pcm_str *pstr = substream->pstr;
100
101         memset(info, 0, sizeof(*info));
102         info->card = pcm->card->number;
103         info->device = pcm->device;
104         info->stream = substream->stream;
105         info->subdevice = substream->number;
106         strlcpy(info->id, pcm->id, sizeof(info->id));
107         strlcpy(info->name, pcm->name, sizeof(info->name));
108         info->dev_class = pcm->dev_class;
109         info->dev_subclass = pcm->dev_subclass;
110         info->subdevices_count = pstr->substream_count;
111         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
112         strlcpy(info->subname, substream->name, sizeof(info->subname));
113         runtime = substream->runtime;
114         /* AB: FIXME!!! This is definitely nonsense */
115         if (runtime) {
116                 info->sync = runtime->sync;
117                 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
118         }
119         return 0;
120 }
121
122 int snd_pcm_info_user(struct snd_pcm_substream *substream,
123                       struct snd_pcm_info __user * _info)
124 {
125         struct snd_pcm_info *info;
126         int err;
127
128         info = kmalloc(sizeof(*info), GFP_KERNEL);
129         if (! info)
130                 return -ENOMEM;
131         err = snd_pcm_info(substream, info);
132         if (err >= 0) {
133                 if (copy_to_user(_info, info, sizeof(*info)))
134                         err = -EFAULT;
135         }
136         kfree(info);
137         return err;
138 }
139
140 #undef RULES_DEBUG
141
142 #ifdef RULES_DEBUG
143 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
144 static const char * const snd_pcm_hw_param_names[] = {
145         HW_PARAM(ACCESS),
146         HW_PARAM(FORMAT),
147         HW_PARAM(SUBFORMAT),
148         HW_PARAM(SAMPLE_BITS),
149         HW_PARAM(FRAME_BITS),
150         HW_PARAM(CHANNELS),
151         HW_PARAM(RATE),
152         HW_PARAM(PERIOD_TIME),
153         HW_PARAM(PERIOD_SIZE),
154         HW_PARAM(PERIOD_BYTES),
155         HW_PARAM(PERIODS),
156         HW_PARAM(BUFFER_TIME),
157         HW_PARAM(BUFFER_SIZE),
158         HW_PARAM(BUFFER_BYTES),
159         HW_PARAM(TICK_TIME),
160 };
161 #endif
162
163 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 
164                       struct snd_pcm_hw_params *params)
165 {
166         unsigned int k;
167         struct snd_pcm_hardware *hw;
168         struct snd_interval *i = NULL;
169         struct snd_mask *m = NULL;
170         struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
171         unsigned int rstamps[constrs->rules_num];
172         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
173         unsigned int stamp = 2;
174         int changed, again;
175
176         params->info = 0;
177         params->fifo_size = 0;
178         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
179                 params->msbits = 0;
180         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
181                 params->rate_num = 0;
182                 params->rate_den = 0;
183         }
184
185         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
186                 m = hw_param_mask(params, k);
187                 if (snd_mask_empty(m))
188                         return -EINVAL;
189                 if (!(params->rmask & (1 << k)))
190                         continue;
191 #ifdef RULES_DEBUG
192                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
193                 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
194 #endif
195                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
196 #ifdef RULES_DEBUG
197                 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
198 #endif
199                 if (changed)
200                         params->cmask |= 1 << k;
201                 if (changed < 0)
202                         return changed;
203         }
204
205         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
206                 i = hw_param_interval(params, k);
207                 if (snd_interval_empty(i))
208                         return -EINVAL;
209                 if (!(params->rmask & (1 << k)))
210                         continue;
211 #ifdef RULES_DEBUG
212                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
213                 if (i->empty)
214                         printk("empty");
215                 else
216                         printk("%c%u %u%c", 
217                                i->openmin ? '(' : '[', i->min,
218                                i->max, i->openmax ? ')' : ']');
219                 printk(" -> ");
220 #endif
221                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
222 #ifdef RULES_DEBUG
223                 if (i->empty)
224                         printk("empty\n");
225                 else 
226                         printk("%c%u %u%c\n", 
227                                i->openmin ? '(' : '[', i->min,
228                                i->max, i->openmax ? ')' : ']');
229 #endif
230                 if (changed)
231                         params->cmask |= 1 << k;
232                 if (changed < 0)
233                         return changed;
234         }
235
236         for (k = 0; k < constrs->rules_num; k++)
237                 rstamps[k] = 0;
238         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 
239                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
240         do {
241                 again = 0;
242                 for (k = 0; k < constrs->rules_num; k++) {
243                         struct snd_pcm_hw_rule *r = &constrs->rules[k];
244                         unsigned int d;
245                         int doit = 0;
246                         if (r->cond && !(r->cond & params->flags))
247                                 continue;
248                         for (d = 0; r->deps[d] >= 0; d++) {
249                                 if (vstamps[r->deps[d]] > rstamps[k]) {
250                                         doit = 1;
251                                         break;
252                                 }
253                         }
254                         if (!doit)
255                                 continue;
256 #ifdef RULES_DEBUG
257                         printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
258                         if (r->var >= 0) {
259                                 printk("%s = ", snd_pcm_hw_param_names[r->var]);
260                                 if (hw_is_mask(r->var)) {
261                                         m = hw_param_mask(params, r->var);
262                                         printk("%x", *m->bits);
263                                 } else {
264                                         i = hw_param_interval(params, r->var);
265                                         if (i->empty)
266                                                 printk("empty");
267                                         else
268                                                 printk("%c%u %u%c", 
269                                                        i->openmin ? '(' : '[', i->min,
270                                                        i->max, i->openmax ? ')' : ']');
271                                 }
272                         }
273 #endif
274                         changed = r->func(params, r);
275 #ifdef RULES_DEBUG
276                         if (r->var >= 0) {
277                                 printk(" -> ");
278                                 if (hw_is_mask(r->var))
279                                         printk("%x", *m->bits);
280                                 else {
281                                         if (i->empty)
282                                                 printk("empty");
283                                         else
284                                                 printk("%c%u %u%c", 
285                                                        i->openmin ? '(' : '[', i->min,
286                                                        i->max, i->openmax ? ')' : ']');
287                                 }
288                         }
289                         printk("\n");
290 #endif
291                         rstamps[k] = stamp;
292                         if (changed && r->var >= 0) {
293                                 params->cmask |= (1 << r->var);
294                                 vstamps[r->var] = stamp;
295                                 again = 1;
296                         }
297                         if (changed < 0)
298                                 return changed;
299                         stamp++;
300                 }
301         } while (again);
302         if (!params->msbits) {
303                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
304                 if (snd_interval_single(i))
305                         params->msbits = snd_interval_value(i);
306         }
307
308         if (!params->rate_den) {
309                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
310                 if (snd_interval_single(i)) {
311                         params->rate_num = snd_interval_value(i);
312                         params->rate_den = 1;
313                 }
314         }
315
316         hw = &substream->runtime->hw;
317         if (!params->info)
318                 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
319         if (!params->fifo_size) {
320                 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
321                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
322                 if (snd_mask_min(m) == snd_mask_max(m) &&
323                     snd_interval_min(i) == snd_interval_max(i)) {
324                         changed = substream->ops->ioctl(substream,
325                                         SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
326                         if (changed < 0)
327                                 return changed;
328                 }
329         }
330         params->rmask = 0;
331         return 0;
332 }
333
334 EXPORT_SYMBOL(snd_pcm_hw_refine);
335
336 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
337                                   struct snd_pcm_hw_params __user * _params)
338 {
339         struct snd_pcm_hw_params *params;
340         int err;
341
342         params = memdup_user(_params, sizeof(*params));
343         if (IS_ERR(params))
344                 return PTR_ERR(params);
345
346         err = snd_pcm_hw_refine(substream, params);
347         if (copy_to_user(_params, params, sizeof(*params))) {
348                 if (!err)
349                         err = -EFAULT;
350         }
351
352         kfree(params);
353         return err;
354 }
355
356 static int period_to_usecs(struct snd_pcm_runtime *runtime)
357 {
358         int usecs;
359
360         if (! runtime->rate)
361                 return -1; /* invalid */
362
363         /* take 75% of period time as the deadline */
364         usecs = (750000 / runtime->rate) * runtime->period_size;
365         usecs += ((750000 % runtime->rate) * runtime->period_size) /
366                 runtime->rate;
367
368         return usecs;
369 }
370
371 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
372                              struct snd_pcm_hw_params *params)
373 {
374         struct snd_pcm_runtime *runtime;
375         int err, usecs;
376         unsigned int bits;
377         snd_pcm_uframes_t frames;
378
379         if (PCM_RUNTIME_CHECK(substream))
380                 return -ENXIO;
381         runtime = substream->runtime;
382         snd_pcm_stream_lock_irq(substream);
383         switch (runtime->status->state) {
384         case SNDRV_PCM_STATE_OPEN:
385         case SNDRV_PCM_STATE_SETUP:
386         case SNDRV_PCM_STATE_PREPARED:
387                 break;
388         default:
389                 snd_pcm_stream_unlock_irq(substream);
390                 return -EBADFD;
391         }
392         snd_pcm_stream_unlock_irq(substream);
393 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
394         if (!substream->oss.oss)
395 #endif
396                 if (atomic_read(&substream->mmap_count))
397                         return -EBADFD;
398
399         params->rmask = ~0U;
400         err = snd_pcm_hw_refine(substream, params);
401         if (err < 0)
402                 goto _error;
403
404         err = snd_pcm_hw_params_choose(substream, params);
405         if (err < 0)
406                 goto _error;
407
408         if (substream->ops->hw_params != NULL) {
409                 err = substream->ops->hw_params(substream, params);
410                 if (err < 0)
411                         goto _error;
412         }
413
414         runtime->access = params_access(params);
415         runtime->format = params_format(params);
416         runtime->subformat = params_subformat(params);
417         runtime->channels = params_channels(params);
418         runtime->rate = params_rate(params);
419         runtime->period_size = params_period_size(params);
420         runtime->periods = params_periods(params);
421         runtime->buffer_size = params_buffer_size(params);
422         runtime->info = params->info;
423         runtime->rate_num = params->rate_num;
424         runtime->rate_den = params->rate_den;
425         runtime->no_period_wakeup =
426                         (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
427                         (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
428
429         bits = snd_pcm_format_physical_width(runtime->format);
430         runtime->sample_bits = bits;
431         bits *= runtime->channels;
432         runtime->frame_bits = bits;
433         frames = 1;
434         while (bits % 8 != 0) {
435                 bits *= 2;
436                 frames *= 2;
437         }
438         runtime->byte_align = bits / 8;
439         runtime->min_align = frames;
440
441         /* Default sw params */
442         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
443         runtime->period_step = 1;
444         runtime->control->avail_min = runtime->period_size;
445         runtime->start_threshold = 1;
446         runtime->stop_threshold = runtime->buffer_size;
447         runtime->silence_threshold = 0;
448         runtime->silence_size = 0;
449         runtime->boundary = runtime->buffer_size;
450         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
451                 runtime->boundary *= 2;
452
453         snd_pcm_timer_resolution_change(substream);
454         runtime->status->state = SNDRV_PCM_STATE_SETUP;
455
456         if (pm_qos_request_active(&substream->latency_pm_qos_req))
457                 pm_qos_remove_request(&substream->latency_pm_qos_req);
458         if ((usecs = period_to_usecs(runtime)) >= 0)
459                 pm_qos_add_request(&substream->latency_pm_qos_req,
460                                    PM_QOS_CPU_DMA_LATENCY, usecs);
461         return 0;
462  _error:
463         /* hardware might be unusable from this time,
464            so we force application to retry to set
465            the correct hardware parameter settings */
466         runtime->status->state = SNDRV_PCM_STATE_OPEN;
467         if (substream->ops->hw_free != NULL)
468                 substream->ops->hw_free(substream);
469         return err;
470 }
471
472 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
473                                   struct snd_pcm_hw_params __user * _params)
474 {
475         struct snd_pcm_hw_params *params;
476         int err;
477
478         params = memdup_user(_params, sizeof(*params));
479         if (IS_ERR(params))
480                 return PTR_ERR(params);
481
482         err = snd_pcm_hw_params(substream, params);
483         if (copy_to_user(_params, params, sizeof(*params))) {
484                 if (!err)
485                         err = -EFAULT;
486         }
487
488         kfree(params);
489         return err;
490 }
491
492 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
493 {
494         struct snd_pcm_runtime *runtime;
495         int result = 0;
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_SETUP:
503         case SNDRV_PCM_STATE_PREPARED:
504                 break;
505         default:
506                 snd_pcm_stream_unlock_irq(substream);
507                 return -EBADFD;
508         }
509         snd_pcm_stream_unlock_irq(substream);
510         if (atomic_read(&substream->mmap_count))
511                 return -EBADFD;
512         if (substream->ops->hw_free)
513                 result = substream->ops->hw_free(substream);
514         runtime->status->state = SNDRV_PCM_STATE_OPEN;
515         pm_qos_remove_request(&substream->latency_pm_qos_req);
516         return result;
517 }
518
519 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
520                              struct snd_pcm_sw_params *params)
521 {
522         struct snd_pcm_runtime *runtime;
523         int err;
524
525         if (PCM_RUNTIME_CHECK(substream))
526                 return -ENXIO;
527         runtime = substream->runtime;
528         snd_pcm_stream_lock_irq(substream);
529         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
530                 snd_pcm_stream_unlock_irq(substream);
531                 return -EBADFD;
532         }
533         snd_pcm_stream_unlock_irq(substream);
534
535         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
536                 return -EINVAL;
537         if (params->avail_min == 0)
538                 return -EINVAL;
539         if (params->silence_size >= runtime->boundary) {
540                 if (params->silence_threshold != 0)
541                         return -EINVAL;
542         } else {
543                 if (params->silence_size > params->silence_threshold)
544                         return -EINVAL;
545                 if (params->silence_threshold > runtime->buffer_size)
546                         return -EINVAL;
547         }
548         err = 0;
549         snd_pcm_stream_lock_irq(substream);
550         runtime->tstamp_mode = params->tstamp_mode;
551         runtime->period_step = params->period_step;
552         runtime->control->avail_min = params->avail_min;
553         runtime->start_threshold = params->start_threshold;
554         runtime->stop_threshold = params->stop_threshold;
555         runtime->silence_threshold = params->silence_threshold;
556         runtime->silence_size = params->silence_size;
557         params->boundary = runtime->boundary;
558         if (snd_pcm_running(substream)) {
559                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
560                     runtime->silence_size > 0)
561                         snd_pcm_playback_silence(substream, ULONG_MAX);
562                 err = snd_pcm_update_state(substream, runtime);
563         }
564         snd_pcm_stream_unlock_irq(substream);
565         return err;
566 }
567
568 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
569                                   struct snd_pcm_sw_params __user * _params)
570 {
571         struct snd_pcm_sw_params params;
572         int err;
573         if (copy_from_user(&params, _params, sizeof(params)))
574                 return -EFAULT;
575         err = snd_pcm_sw_params(substream, &params);
576         if (copy_to_user(_params, &params, sizeof(params)))
577                 return -EFAULT;
578         return err;
579 }
580
581 int snd_pcm_status(struct snd_pcm_substream *substream,
582                    struct snd_pcm_status *status)
583 {
584         struct snd_pcm_runtime *runtime = substream->runtime;
585
586         snd_pcm_stream_lock_irq(substream);
587         status->state = runtime->status->state;
588         status->suspended_state = runtime->status->suspended_state;
589         if (status->state == SNDRV_PCM_STATE_OPEN)
590                 goto _end;
591         status->trigger_tstamp = runtime->trigger_tstamp;
592         if (snd_pcm_running(substream)) {
593                 snd_pcm_update_hw_ptr(substream);
594                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
595                         status->tstamp = runtime->status->tstamp;
596                         goto _tstamp_end;
597                 }
598         }
599         snd_pcm_gettime(runtime, &status->tstamp);
600  _tstamp_end:
601         status->appl_ptr = runtime->control->appl_ptr;
602         status->hw_ptr = runtime->status->hw_ptr;
603         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
604                 status->avail = snd_pcm_playback_avail(runtime);
605                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
606                     runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
607                         status->delay = runtime->buffer_size - status->avail;
608                         status->delay += runtime->delay;
609                 } else
610                         status->delay = 0;
611         } else {
612                 status->avail = snd_pcm_capture_avail(runtime);
613                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
614                         status->delay = status->avail + runtime->delay;
615                 else
616                         status->delay = 0;
617         }
618         status->avail_max = runtime->avail_max;
619         status->overrange = runtime->overrange;
620         runtime->avail_max = 0;
621         runtime->overrange = 0;
622  _end:
623         snd_pcm_stream_unlock_irq(substream);
624         return 0;
625 }
626
627 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
628                                struct snd_pcm_status __user * _status)
629 {
630         struct snd_pcm_status status;
631         int res;
632         
633         memset(&status, 0, sizeof(status));
634         res = snd_pcm_status(substream, &status);
635         if (res < 0)
636                 return res;
637         if (copy_to_user(_status, &status, sizeof(status)))
638                 return -EFAULT;
639         return 0;
640 }
641
642 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
643                                 struct snd_pcm_channel_info * info)
644 {
645         struct snd_pcm_runtime *runtime;
646         unsigned int channel;
647         
648         channel = info->channel;
649         runtime = substream->runtime;
650         snd_pcm_stream_lock_irq(substream);
651         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
652                 snd_pcm_stream_unlock_irq(substream);
653                 return -EBADFD;
654         }
655         snd_pcm_stream_unlock_irq(substream);
656         if (channel >= runtime->channels)
657                 return -EINVAL;
658         memset(info, 0, sizeof(*info));
659         info->channel = channel;
660         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
661 }
662
663 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
664                                      struct snd_pcm_channel_info __user * _info)
665 {
666         struct snd_pcm_channel_info info;
667         int res;
668         
669         if (copy_from_user(&info, _info, sizeof(info)))
670                 return -EFAULT;
671         res = snd_pcm_channel_info(substream, &info);
672         if (res < 0)
673                 return res;
674         if (copy_to_user(_info, &info, sizeof(info)))
675                 return -EFAULT;
676         return 0;
677 }
678
679 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
680 {
681         struct snd_pcm_runtime *runtime = substream->runtime;
682         if (runtime->trigger_master == NULL)
683                 return;
684         if (runtime->trigger_master == substream) {
685                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
686         } else {
687                 snd_pcm_trigger_tstamp(runtime->trigger_master);
688                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
689         }
690         runtime->trigger_master = NULL;
691 }
692
693 struct action_ops {
694         int (*pre_action)(struct snd_pcm_substream *substream, int state);
695         int (*do_action)(struct snd_pcm_substream *substream, int state);
696         void (*undo_action)(struct snd_pcm_substream *substream, int state);
697         void (*post_action)(struct snd_pcm_substream *substream, int state);
698 };
699
700 /*
701  *  this functions is core for handling of linked stream
702  *  Note: the stream state might be changed also on failure
703  *  Note2: call with calling stream lock + link lock
704  */
705 static int snd_pcm_action_group(struct action_ops *ops,
706                                 struct snd_pcm_substream *substream,
707                                 int state, int do_lock)
708 {
709         struct snd_pcm_substream *s = NULL;
710         struct snd_pcm_substream *s1;
711         int res = 0;
712
713         snd_pcm_group_for_each_entry(s, substream) {
714                 if (do_lock && s != substream)
715                         spin_lock_nested(&s->self_group.lock,
716                                          SINGLE_DEPTH_NESTING);
717                 res = ops->pre_action(s, state);
718                 if (res < 0)
719                         goto _unlock;
720         }
721         snd_pcm_group_for_each_entry(s, substream) {
722                 res = ops->do_action(s, state);
723                 if (res < 0) {
724                         if (ops->undo_action) {
725                                 snd_pcm_group_for_each_entry(s1, substream) {
726                                         if (s1 == s) /* failed stream */
727                                                 break;
728                                         ops->undo_action(s1, state);
729                                 }
730                         }
731                         s = NULL; /* unlock all */
732                         goto _unlock;
733                 }
734         }
735         snd_pcm_group_for_each_entry(s, substream) {
736                 ops->post_action(s, state);
737         }
738  _unlock:
739         if (do_lock) {
740                 /* unlock streams */
741                 snd_pcm_group_for_each_entry(s1, substream) {
742                         if (s1 != substream)
743                                 spin_unlock(&s1->self_group.lock);
744                         if (s1 == s)    /* end */
745                                 break;
746                 }
747         }
748         return res;
749 }
750
751 /*
752  *  Note: call with stream lock
753  */
754 static int snd_pcm_action_single(struct action_ops *ops,
755                                  struct snd_pcm_substream *substream,
756                                  int state)
757 {
758         int res;
759         
760         res = ops->pre_action(substream, state);
761         if (res < 0)
762                 return res;
763         res = ops->do_action(substream, state);
764         if (res == 0)
765                 ops->post_action(substream, state);
766         else if (ops->undo_action)
767                 ops->undo_action(substream, state);
768         return res;
769 }
770
771 /*
772  *  Note: call with stream lock
773  */
774 static int snd_pcm_action(struct action_ops *ops,
775                           struct snd_pcm_substream *substream,
776                           int state)
777 {
778         int res;
779
780         if (snd_pcm_stream_linked(substream)) {
781                 if (!spin_trylock(&substream->group->lock)) {
782                         spin_unlock(&substream->self_group.lock);
783                         spin_lock(&substream->group->lock);
784                         spin_lock(&substream->self_group.lock);
785                 }
786                 res = snd_pcm_action_group(ops, substream, state, 1);
787                 spin_unlock(&substream->group->lock);
788         } else {
789                 res = snd_pcm_action_single(ops, substream, state);
790         }
791         return res;
792 }
793
794 /*
795  *  Note: don't use any locks before
796  */
797 static int snd_pcm_action_lock_irq(struct action_ops *ops,
798                                    struct snd_pcm_substream *substream,
799                                    int state)
800 {
801         int res;
802
803         read_lock_irq(&snd_pcm_link_rwlock);
804         if (snd_pcm_stream_linked(substream)) {
805                 spin_lock(&substream->group->lock);
806                 spin_lock(&substream->self_group.lock);
807                 res = snd_pcm_action_group(ops, substream, state, 1);
808                 spin_unlock(&substream->self_group.lock);
809                 spin_unlock(&substream->group->lock);
810         } else {
811                 spin_lock(&substream->self_group.lock);
812                 res = snd_pcm_action_single(ops, substream, state);
813                 spin_unlock(&substream->self_group.lock);
814         }
815         read_unlock_irq(&snd_pcm_link_rwlock);
816         return res;
817 }
818
819 /*
820  */
821 static int snd_pcm_action_nonatomic(struct action_ops *ops,
822                                     struct snd_pcm_substream *substream,
823                                     int state)
824 {
825         int res;
826
827         down_read(&snd_pcm_link_rwsem);
828         if (snd_pcm_stream_linked(substream))
829                 res = snd_pcm_action_group(ops, substream, state, 0);
830         else
831                 res = snd_pcm_action_single(ops, substream, state);
832         up_read(&snd_pcm_link_rwsem);
833         return res;
834 }
835
836 /*
837  * start callbacks
838  */
839 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
840 {
841         struct snd_pcm_runtime *runtime = substream->runtime;
842         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
843                 return -EBADFD;
844         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
845             !snd_pcm_playback_data(substream))
846                 return -EPIPE;
847         runtime->trigger_master = substream;
848         return 0;
849 }
850
851 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
852 {
853         if (substream->runtime->trigger_master != substream)
854                 return 0;
855         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
856 }
857
858 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
859 {
860         if (substream->runtime->trigger_master == substream)
861                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
862 }
863
864 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
865 {
866         struct snd_pcm_runtime *runtime = substream->runtime;
867         snd_pcm_trigger_tstamp(substream);
868         runtime->hw_ptr_jiffies = jiffies;
869         runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 
870                                                             runtime->rate;
871         runtime->status->state = state;
872         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
873             runtime->silence_size > 0)
874                 snd_pcm_playback_silence(substream, ULONG_MAX);
875         if (substream->timer)
876                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
877                                  &runtime->trigger_tstamp);
878 }
879
880 static struct action_ops snd_pcm_action_start = {
881         .pre_action = snd_pcm_pre_start,
882         .do_action = snd_pcm_do_start,
883         .undo_action = snd_pcm_undo_start,
884         .post_action = snd_pcm_post_start
885 };
886
887 /**
888  * snd_pcm_start - start all linked streams
889  * @substream: the PCM substream instance
890  */
891 int snd_pcm_start(struct snd_pcm_substream *substream)
892 {
893         return snd_pcm_action(&snd_pcm_action_start, substream,
894                               SNDRV_PCM_STATE_RUNNING);
895 }
896
897 /*
898  * stop callbacks
899  */
900 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
901 {
902         struct snd_pcm_runtime *runtime = substream->runtime;
903         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
904                 return -EBADFD;
905         runtime->trigger_master = substream;
906         return 0;
907 }
908
909 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
910 {
911         if (substream->runtime->trigger_master == substream &&
912             snd_pcm_running(substream))
913                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
914         return 0; /* unconditonally stop all substreams */
915 }
916
917 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
918 {
919         struct snd_pcm_runtime *runtime = substream->runtime;
920         if (runtime->status->state != state) {
921                 snd_pcm_trigger_tstamp(substream);
922                 if (substream->timer)
923                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
924                                          &runtime->trigger_tstamp);
925                 runtime->status->state = state;
926         }
927         wake_up(&runtime->sleep);
928         wake_up(&runtime->tsleep);
929 }
930
931 static struct action_ops snd_pcm_action_stop = {
932         .pre_action = snd_pcm_pre_stop,
933         .do_action = snd_pcm_do_stop,
934         .post_action = snd_pcm_post_stop
935 };
936
937 /**
938  * snd_pcm_stop - try to stop all running streams in the substream group
939  * @substream: the PCM substream instance
940  * @state: PCM state after stopping the stream
941  *
942  * The state of each stream is then changed to the given state unconditionally.
943  */
944 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
945 {
946         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
947 }
948
949 EXPORT_SYMBOL(snd_pcm_stop);
950
951 /**
952  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
953  * @substream: the PCM substream
954  *
955  * After stopping, the state is changed to SETUP.
956  * Unlike snd_pcm_stop(), this affects only the given stream.
957  */
958 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
959 {
960         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
961                                      SNDRV_PCM_STATE_SETUP);
962 }
963
964 /*
965  * pause callbacks
966  */
967 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
968 {
969         struct snd_pcm_runtime *runtime = substream->runtime;
970         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
971                 return -ENOSYS;
972         if (push) {
973                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
974                         return -EBADFD;
975         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
976                 return -EBADFD;
977         runtime->trigger_master = substream;
978         return 0;
979 }
980
981 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
982 {
983         if (substream->runtime->trigger_master != substream)
984                 return 0;
985         /* some drivers might use hw_ptr to recover from the pause -
986            update the hw_ptr now */
987         if (push)
988                 snd_pcm_update_hw_ptr(substream);
989         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
990          * a delta between the current jiffies, this gives a large enough
991          * delta, effectively to skip the check once.
992          */
993         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
994         return substream->ops->trigger(substream,
995                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
996                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
997 }
998
999 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1000 {
1001         if (substream->runtime->trigger_master == substream)
1002                 substream->ops->trigger(substream,
1003                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1004                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1005 }
1006
1007 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1008 {
1009         struct snd_pcm_runtime *runtime = substream->runtime;
1010         snd_pcm_trigger_tstamp(substream);
1011         if (push) {
1012                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1013                 if (substream->timer)
1014                         snd_timer_notify(substream->timer,
1015                                          SNDRV_TIMER_EVENT_MPAUSE,
1016                                          &runtime->trigger_tstamp);
1017                 wake_up(&runtime->sleep);
1018                 wake_up(&runtime->tsleep);
1019         } else {
1020                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1021                 if (substream->timer)
1022                         snd_timer_notify(substream->timer,
1023                                          SNDRV_TIMER_EVENT_MCONTINUE,
1024                                          &runtime->trigger_tstamp);
1025         }
1026 }
1027
1028 static struct action_ops snd_pcm_action_pause = {
1029         .pre_action = snd_pcm_pre_pause,
1030         .do_action = snd_pcm_do_pause,
1031         .undo_action = snd_pcm_undo_pause,
1032         .post_action = snd_pcm_post_pause
1033 };
1034
1035 /*
1036  * Push/release the pause for all linked streams.
1037  */
1038 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1039 {
1040         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1041 }
1042
1043 #ifdef CONFIG_PM
1044 /* suspend */
1045
1046 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1047 {
1048         struct snd_pcm_runtime *runtime = substream->runtime;
1049         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1050                 return -EBUSY;
1051         runtime->trigger_master = substream;
1052         return 0;
1053 }
1054
1055 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1056 {
1057         struct snd_pcm_runtime *runtime = substream->runtime;
1058         if (runtime->trigger_master != substream)
1059                 return 0;
1060         if (! snd_pcm_running(substream))
1061                 return 0;
1062         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1063         return 0; /* suspend unconditionally */
1064 }
1065
1066 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1067 {
1068         struct snd_pcm_runtime *runtime = substream->runtime;
1069         snd_pcm_trigger_tstamp(substream);
1070         if (substream->timer)
1071                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1072                                  &runtime->trigger_tstamp);
1073         runtime->status->suspended_state = runtime->status->state;
1074         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1075         wake_up(&runtime->sleep);
1076         wake_up(&runtime->tsleep);
1077 }
1078
1079 static struct action_ops snd_pcm_action_suspend = {
1080         .pre_action = snd_pcm_pre_suspend,
1081         .do_action = snd_pcm_do_suspend,
1082         .post_action = snd_pcm_post_suspend
1083 };
1084
1085 /**
1086  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1087  * @substream: the PCM substream
1088  *
1089  * After this call, all streams are changed to SUSPENDED state.
1090  */
1091 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1092 {
1093         int err;
1094         unsigned long flags;
1095
1096         if (! substream)
1097                 return 0;
1098
1099         snd_pcm_stream_lock_irqsave(substream, flags);
1100         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1101         snd_pcm_stream_unlock_irqrestore(substream, flags);
1102         return err;
1103 }
1104
1105 EXPORT_SYMBOL(snd_pcm_suspend);
1106
1107 /**
1108  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1109  * @pcm: the PCM instance
1110  *
1111  * After this call, all streams are changed to SUSPENDED state.
1112  */
1113 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1114 {
1115         struct snd_pcm_substream *substream;
1116         int stream, err = 0;
1117
1118         if (! pcm)
1119                 return 0;
1120
1121         for (stream = 0; stream < 2; stream++) {
1122                 for (substream = pcm->streams[stream].substream;
1123                      substream; substream = substream->next) {
1124                         /* FIXME: the open/close code should lock this as well */
1125                         if (substream->runtime == NULL)
1126                                 continue;
1127                         err = snd_pcm_suspend(substream);
1128                         if (err < 0 && err != -EBUSY)
1129                                 return err;
1130                 }
1131         }
1132         return 0;
1133 }
1134
1135 EXPORT_SYMBOL(snd_pcm_suspend_all);
1136
1137 /* resume */
1138
1139 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1140 {
1141         struct snd_pcm_runtime *runtime = substream->runtime;
1142         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1143                 return -ENOSYS;
1144         runtime->trigger_master = substream;
1145         return 0;
1146 }
1147
1148 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1149 {
1150         struct snd_pcm_runtime *runtime = substream->runtime;
1151         if (runtime->trigger_master != substream)
1152                 return 0;
1153         /* DMA not running previously? */
1154         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1155             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1156              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1157                 return 0;
1158         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1159 }
1160
1161 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1162 {
1163         if (substream->runtime->trigger_master == substream &&
1164             snd_pcm_running(substream))
1165                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1166 }
1167
1168 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1169 {
1170         struct snd_pcm_runtime *runtime = substream->runtime;
1171         snd_pcm_trigger_tstamp(substream);
1172         if (substream->timer)
1173                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1174                                  &runtime->trigger_tstamp);
1175         runtime->status->state = runtime->status->suspended_state;
1176 }
1177
1178 static struct action_ops snd_pcm_action_resume = {
1179         .pre_action = snd_pcm_pre_resume,
1180         .do_action = snd_pcm_do_resume,
1181         .undo_action = snd_pcm_undo_resume,
1182         .post_action = snd_pcm_post_resume
1183 };
1184
1185 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1186 {
1187         struct snd_card *card = substream->pcm->card;
1188         int res;
1189
1190         snd_power_lock(card);
1191         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1192                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1193         snd_power_unlock(card);
1194         return res;
1195 }
1196
1197 #else
1198
1199 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1200 {
1201         return -ENOSYS;
1202 }
1203
1204 #endif /* CONFIG_PM */
1205
1206 /*
1207  * xrun ioctl
1208  *
1209  * Change the RUNNING stream(s) to XRUN state.
1210  */
1211 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1212 {
1213         struct snd_card *card = substream->pcm->card;
1214         struct snd_pcm_runtime *runtime = substream->runtime;
1215         int result;
1216
1217         snd_power_lock(card);
1218         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1219                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1220                 if (result < 0)
1221                         goto _unlock;
1222         }
1223
1224         snd_pcm_stream_lock_irq(substream);
1225         switch (runtime->status->state) {
1226         case SNDRV_PCM_STATE_XRUN:
1227                 result = 0;     /* already there */
1228                 break;
1229         case SNDRV_PCM_STATE_RUNNING:
1230                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1231                 break;
1232         default:
1233                 result = -EBADFD;
1234         }
1235         snd_pcm_stream_unlock_irq(substream);
1236  _unlock:
1237         snd_power_unlock(card);
1238         return result;
1239 }
1240
1241 /*
1242  * reset ioctl
1243  */
1244 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1245 {
1246         struct snd_pcm_runtime *runtime = substream->runtime;
1247         switch (runtime->status->state) {
1248         case SNDRV_PCM_STATE_RUNNING:
1249         case SNDRV_PCM_STATE_PREPARED:
1250         case SNDRV_PCM_STATE_PAUSED:
1251         case SNDRV_PCM_STATE_SUSPENDED:
1252                 return 0;
1253         default:
1254                 return -EBADFD;
1255         }
1256 }
1257
1258 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1259 {
1260         struct snd_pcm_runtime *runtime = substream->runtime;
1261         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1262         if (err < 0)
1263                 return err;
1264         runtime->hw_ptr_base = 0;
1265         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1266                 runtime->status->hw_ptr % runtime->period_size;
1267         runtime->silence_start = runtime->status->hw_ptr;
1268         runtime->silence_filled = 0;
1269         return 0;
1270 }
1271
1272 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1273 {
1274         struct snd_pcm_runtime *runtime = substream->runtime;
1275         runtime->control->appl_ptr = runtime->status->hw_ptr;
1276         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1277             runtime->silence_size > 0)
1278                 snd_pcm_playback_silence(substream, ULONG_MAX);
1279 }
1280
1281 static struct action_ops snd_pcm_action_reset = {
1282         .pre_action = snd_pcm_pre_reset,
1283         .do_action = snd_pcm_do_reset,
1284         .post_action = snd_pcm_post_reset
1285 };
1286
1287 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1288 {
1289         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1290 }
1291
1292 /*
1293  * prepare ioctl
1294  */
1295 /* we use the second argument for updating f_flags */
1296 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1297                                int f_flags)
1298 {
1299         struct snd_pcm_runtime *runtime = substream->runtime;
1300         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1301             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1302                 return -EBADFD;
1303         if (snd_pcm_running(substream))
1304                 return -EBUSY;
1305         substream->f_flags = f_flags;
1306         return 0;
1307 }
1308
1309 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1310 {
1311         int err;
1312         err = substream->ops->prepare(substream);
1313         if (err < 0)
1314                 return err;
1315         return snd_pcm_do_reset(substream, 0);
1316 }
1317
1318 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1319 {
1320         struct snd_pcm_runtime *runtime = substream->runtime;
1321         runtime->control->appl_ptr = runtime->status->hw_ptr;
1322         runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1323 }
1324
1325 static struct action_ops snd_pcm_action_prepare = {
1326         .pre_action = snd_pcm_pre_prepare,
1327         .do_action = snd_pcm_do_prepare,
1328         .post_action = snd_pcm_post_prepare
1329 };
1330
1331 /**
1332  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1333  * @substream: the PCM substream instance
1334  * @file: file to refer f_flags
1335  */
1336 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1337                            struct file *file)
1338 {
1339         int res;
1340         struct snd_card *card = substream->pcm->card;
1341         int f_flags;
1342
1343         if (file)
1344                 f_flags = file->f_flags;
1345         else
1346                 f_flags = substream->f_flags;
1347
1348         snd_power_lock(card);
1349         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1350                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1351                                                substream, f_flags);
1352         snd_power_unlock(card);
1353         return res;
1354 }
1355
1356 /*
1357  * drain ioctl
1358  */
1359
1360 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1361 {
1362         substream->runtime->trigger_master = substream;
1363         return 0;
1364 }
1365
1366 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1367 {
1368         struct snd_pcm_runtime *runtime = substream->runtime;
1369         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1370                 switch (runtime->status->state) {
1371                 case SNDRV_PCM_STATE_PREPARED:
1372                         /* start playback stream if possible */
1373                         if (! snd_pcm_playback_empty(substream)) {
1374                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1375                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1376                         }
1377                         break;
1378                 case SNDRV_PCM_STATE_RUNNING:
1379                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1380                         break;
1381                 default:
1382                         break;
1383                 }
1384         } else {
1385                 /* stop running stream */
1386                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1387                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1388                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1389                         snd_pcm_do_stop(substream, new_state);
1390                         snd_pcm_post_stop(substream, new_state);
1391                 }
1392         }
1393         return 0;
1394 }
1395
1396 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1397 {
1398 }
1399
1400 static struct action_ops snd_pcm_action_drain_init = {
1401         .pre_action = snd_pcm_pre_drain_init,
1402         .do_action = snd_pcm_do_drain_init,
1403         .post_action = snd_pcm_post_drain_init
1404 };
1405
1406 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1407
1408 /*
1409  * Drain the stream(s).
1410  * When the substream is linked, sync until the draining of all playback streams
1411  * is finished.
1412  * After this call, all streams are supposed to be either SETUP or DRAINING
1413  * (capture only) state.
1414  */
1415 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1416                          struct file *file)
1417 {
1418         struct snd_card *card;
1419         struct snd_pcm_runtime *runtime;
1420         struct snd_pcm_substream *s;
1421         wait_queue_t wait;
1422         int result = 0;
1423         int nonblock = 0;
1424
1425         card = substream->pcm->card;
1426         runtime = substream->runtime;
1427
1428         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1429                 return -EBADFD;
1430
1431         snd_power_lock(card);
1432         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1433                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1434                 if (result < 0) {
1435                         snd_power_unlock(card);
1436                         return result;
1437                 }
1438         }
1439
1440         if (file) {
1441                 if (file->f_flags & O_NONBLOCK)
1442                         nonblock = 1;
1443         } else if (substream->f_flags & O_NONBLOCK)
1444                 nonblock = 1;
1445
1446         down_read(&snd_pcm_link_rwsem);
1447         snd_pcm_stream_lock_irq(substream);
1448         /* resume pause */
1449         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1450                 snd_pcm_pause(substream, 0);
1451
1452         /* pre-start/stop - all running streams are changed to DRAINING state */
1453         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1454         if (result < 0)
1455                 goto unlock;
1456         /* in non-blocking, we don't wait in ioctl but let caller poll */
1457         if (nonblock) {
1458                 result = -EAGAIN;
1459                 goto unlock;
1460         }
1461
1462         for (;;) {
1463                 long tout;
1464                 struct snd_pcm_runtime *to_check;
1465                 if (signal_pending(current)) {
1466                         result = -ERESTARTSYS;
1467                         break;
1468                 }
1469                 /* find a substream to drain */
1470                 to_check = NULL;
1471                 snd_pcm_group_for_each_entry(s, substream) {
1472                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1473                                 continue;
1474                         runtime = s->runtime;
1475                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1476                                 to_check = runtime;
1477                                 break;
1478                         }
1479                 }
1480                 if (!to_check)
1481                         break; /* all drained */
1482                 init_waitqueue_entry(&wait, current);
1483                 add_wait_queue(&to_check->sleep, &wait);
1484                 snd_pcm_stream_unlock_irq(substream);
1485                 up_read(&snd_pcm_link_rwsem);
1486                 snd_power_unlock(card);
1487                 if (runtime->no_period_wakeup)
1488                         tout = MAX_SCHEDULE_TIMEOUT;
1489                 else {
1490                         tout = 10;
1491                         if (runtime->rate) {
1492                                 long t = runtime->period_size * 2 / runtime->rate;
1493                                 tout = max(t, tout);
1494                         }
1495                         tout = msecs_to_jiffies(tout * 1000);
1496                 }
1497                 tout = schedule_timeout_interruptible(tout);
1498                 snd_power_lock(card);
1499                 down_read(&snd_pcm_link_rwsem);
1500                 snd_pcm_stream_lock_irq(substream);
1501                 remove_wait_queue(&to_check->sleep, &wait);
1502                 if (tout == 0) {
1503                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1504                                 result = -ESTRPIPE;
1505                         else {
1506                                 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1507                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1508                                 result = -EIO;
1509                         }
1510                         break;
1511                 }
1512         }
1513
1514  unlock:
1515         snd_pcm_stream_unlock_irq(substream);
1516         up_read(&snd_pcm_link_rwsem);
1517         snd_power_unlock(card);
1518
1519         return result;
1520 }
1521
1522 /*
1523  * drop ioctl
1524  *
1525  * Immediately put all linked substreams into SETUP state.
1526  */
1527 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1528 {
1529         struct snd_pcm_runtime *runtime;
1530         struct snd_card *card;
1531         int result = 0;
1532         
1533         if (PCM_RUNTIME_CHECK(substream))
1534                 return -ENXIO;
1535         runtime = substream->runtime;
1536         card = substream->pcm->card;
1537
1538         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1539             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1540             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1541                 return -EBADFD;
1542
1543         snd_pcm_stream_lock_irq(substream);
1544         /* resume pause */
1545         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1546                 snd_pcm_pause(substream, 0);
1547
1548         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1549         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1550         snd_pcm_stream_unlock_irq(substream);
1551
1552         return result;
1553 }
1554
1555
1556 /* WARNING: Don't forget to fput back the file */
1557 static struct file *snd_pcm_file_fd(int fd)
1558 {
1559         struct file *file;
1560         struct inode *inode;
1561         unsigned int minor;
1562
1563         file = fget(fd);
1564         if (!file)
1565                 return NULL;
1566         inode = file->f_path.dentry->d_inode;
1567         if (!S_ISCHR(inode->i_mode) ||
1568             imajor(inode) != snd_major) {
1569                 fput(file);
1570                 return NULL;
1571         }
1572         minor = iminor(inode);
1573         if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1574             !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1575                 fput(file);
1576                 return NULL;
1577         }
1578         return file;
1579 }
1580
1581 /*
1582  * PCM link handling
1583  */
1584 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1585 {
1586         int res = 0;
1587         struct file *file;
1588         struct snd_pcm_file *pcm_file;
1589         struct snd_pcm_substream *substream1;
1590
1591         file = snd_pcm_file_fd(fd);
1592         if (!file)
1593                 return -EBADFD;
1594         pcm_file = file->private_data;
1595         substream1 = pcm_file->substream;
1596         down_write(&snd_pcm_link_rwsem);
1597         write_lock_irq(&snd_pcm_link_rwlock);
1598         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1599             substream->runtime->status->state != substream1->runtime->status->state) {
1600                 res = -EBADFD;
1601                 goto _end;
1602         }
1603         if (snd_pcm_stream_linked(substream1)) {
1604                 res = -EALREADY;
1605                 goto _end;
1606         }
1607         if (!snd_pcm_stream_linked(substream)) {
1608                 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1609                 if (substream->group == NULL) {
1610                         res = -ENOMEM;
1611                         goto _end;
1612                 }
1613                 spin_lock_init(&substream->group->lock);
1614                 INIT_LIST_HEAD(&substream->group->substreams);
1615                 list_add_tail(&substream->link_list, &substream->group->substreams);
1616                 substream->group->count = 1;
1617         }
1618         list_add_tail(&substream1->link_list, &substream->group->substreams);
1619         substream->group->count++;
1620         substream1->group = substream->group;
1621  _end:
1622         write_unlock_irq(&snd_pcm_link_rwlock);
1623         up_write(&snd_pcm_link_rwsem);
1624         fput(file);
1625         return res;
1626 }
1627
1628 static void relink_to_local(struct snd_pcm_substream *substream)
1629 {
1630         substream->group = &substream->self_group;
1631         INIT_LIST_HEAD(&substream->self_group.substreams);
1632         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1633 }
1634
1635 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1636 {
1637         struct snd_pcm_substream *s;
1638         int res = 0;
1639
1640         down_write(&snd_pcm_link_rwsem);
1641         write_lock_irq(&snd_pcm_link_rwlock);
1642         if (!snd_pcm_stream_linked(substream)) {
1643                 res = -EALREADY;
1644                 goto _end;
1645         }
1646         list_del(&substream->link_list);
1647         substream->group->count--;
1648         if (substream->group->count == 1) {     /* detach the last stream, too */
1649                 snd_pcm_group_for_each_entry(s, substream) {
1650                         relink_to_local(s);
1651                         break;
1652                 }
1653                 kfree(substream->group);
1654         }
1655         relink_to_local(substream);
1656        _end:
1657         write_unlock_irq(&snd_pcm_link_rwlock);
1658         up_write(&snd_pcm_link_rwsem);
1659         return res;
1660 }
1661
1662 /*
1663  * hw configurator
1664  */
1665 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1666                                struct snd_pcm_hw_rule *rule)
1667 {
1668         struct snd_interval t;
1669         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1670                      hw_param_interval_c(params, rule->deps[1]), &t);
1671         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1672 }
1673
1674 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1675                                struct snd_pcm_hw_rule *rule)
1676 {
1677         struct snd_interval t;
1678         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1679                      hw_param_interval_c(params, rule->deps[1]), &t);
1680         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1681 }
1682
1683 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1684                                    struct snd_pcm_hw_rule *rule)
1685 {
1686         struct snd_interval t;
1687         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1688                          hw_param_interval_c(params, rule->deps[1]),
1689                          (unsigned long) rule->private, &t);
1690         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1691 }
1692
1693 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1694                                    struct snd_pcm_hw_rule *rule)
1695 {
1696         struct snd_interval t;
1697         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1698                          (unsigned long) rule->private,
1699                          hw_param_interval_c(params, rule->deps[1]), &t);
1700         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1701 }
1702
1703 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1704                                   struct snd_pcm_hw_rule *rule)
1705 {
1706         unsigned int k;
1707         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1708         struct snd_mask m;
1709         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1710         snd_mask_any(&m);
1711         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1712                 int bits;
1713                 if (! snd_mask_test(mask, k))
1714                         continue;
1715                 bits = snd_pcm_format_physical_width(k);
1716                 if (bits <= 0)
1717                         continue; /* ignore invalid formats */
1718                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1719                         snd_mask_reset(&m, k);
1720         }
1721         return snd_mask_refine(mask, &m);
1722 }
1723
1724 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1725                                        struct snd_pcm_hw_rule *rule)
1726 {
1727         struct snd_interval t;
1728         unsigned int k;
1729         t.min = UINT_MAX;
1730         t.max = 0;
1731         t.openmin = 0;
1732         t.openmax = 0;
1733         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1734                 int bits;
1735                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1736                         continue;
1737                 bits = snd_pcm_format_physical_width(k);
1738                 if (bits <= 0)
1739                         continue; /* ignore invalid formats */
1740                 if (t.min > (unsigned)bits)
1741                         t.min = bits;
1742                 if (t.max < (unsigned)bits)
1743                         t.max = bits;
1744         }
1745         t.integer = 1;
1746         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1747 }
1748
1749 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1750 #error "Change this table"
1751 #endif
1752
1753 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1754                                  48000, 64000, 88200, 96000, 176400, 192000 };
1755
1756 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1757         .count = ARRAY_SIZE(rates),
1758         .list = rates,
1759 };
1760
1761 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1762                                 struct snd_pcm_hw_rule *rule)
1763 {
1764         struct snd_pcm_hardware *hw = rule->private;
1765         return snd_interval_list(hw_param_interval(params, rule->var),
1766                                  snd_pcm_known_rates.count,
1767                                  snd_pcm_known_rates.list, hw->rates);
1768 }               
1769
1770 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1771                                             struct snd_pcm_hw_rule *rule)
1772 {
1773         struct snd_interval t;
1774         struct snd_pcm_substream *substream = rule->private;
1775         t.min = 0;
1776         t.max = substream->buffer_bytes_max;
1777         t.openmin = 0;
1778         t.openmax = 0;
1779         t.integer = 1;
1780         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1781 }               
1782
1783 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1784 {
1785         struct snd_pcm_runtime *runtime = substream->runtime;
1786         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1787         int k, err;
1788
1789         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1790                 snd_mask_any(constrs_mask(constrs, k));
1791         }
1792
1793         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1794                 snd_interval_any(constrs_interval(constrs, k));
1795         }
1796
1797         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1798         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1799         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1800         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1801         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1802
1803         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1804                                    snd_pcm_hw_rule_format, NULL,
1805                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1806         if (err < 0)
1807                 return err;
1808         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 
1809                                   snd_pcm_hw_rule_sample_bits, NULL,
1810                                   SNDRV_PCM_HW_PARAM_FORMAT, 
1811                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1812         if (err < 0)
1813                 return err;
1814         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 
1815                                   snd_pcm_hw_rule_div, NULL,
1816                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1817         if (err < 0)
1818                 return err;
1819         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
1820                                   snd_pcm_hw_rule_mul, NULL,
1821                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1822         if (err < 0)
1823                 return err;
1824         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
1825                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1826                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1827         if (err < 0)
1828                 return err;
1829         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
1830                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1831                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1832         if (err < 0)
1833                 return err;
1834         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 
1835                                   snd_pcm_hw_rule_div, NULL,
1836                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1837         if (err < 0)
1838                 return err;
1839         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
1840                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1841                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1842         if (err < 0)
1843                 return err;
1844         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
1845                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1846                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1847         if (err < 0)
1848                 return err;
1849         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 
1850                                   snd_pcm_hw_rule_div, NULL,
1851                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1852         if (err < 0)
1853                 return err;
1854         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
1855                                   snd_pcm_hw_rule_div, NULL,
1856                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1857         if (err < 0)
1858                 return err;
1859         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
1860                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1861                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1862         if (err < 0)
1863                 return err;
1864         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
1865                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1866                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1867         if (err < 0)
1868                 return err;
1869         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
1870                                   snd_pcm_hw_rule_mul, NULL,
1871                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1872         if (err < 0)
1873                 return err;
1874         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
1875                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1876                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1877         if (err < 0)
1878                 return err;
1879         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
1880                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1881                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1882         if (err < 0)
1883                 return err;
1884         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 
1885                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1886                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1887         if (err < 0)
1888                 return err;
1889         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 
1890                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1891                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1892         if (err < 0)
1893                 return err;
1894         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 
1895                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1896                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1897         if (err < 0)
1898                 return err;
1899         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 
1900                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1901                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1902         if (err < 0)
1903                 return err;
1904         return 0;
1905 }
1906
1907 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1908 {
1909         struct snd_pcm_runtime *runtime = substream->runtime;
1910         struct snd_pcm_hardware *hw = &runtime->hw;
1911         int err;
1912         unsigned int mask = 0;
1913
1914         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1915                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1916         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1917                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1918         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1919                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1920                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1921                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1922                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1923                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1924                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1925         }
1926         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1927         if (err < 0)
1928                 return err;
1929
1930         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1931         if (err < 0)
1932                 return err;
1933
1934         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1935         if (err < 0)
1936                 return err;
1937
1938         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1939                                            hw->channels_min, hw->channels_max);
1940         if (err < 0)
1941                 return err;
1942
1943         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1944                                            hw->rate_min, hw->rate_max);
1945         if (err < 0)
1946                 return err;
1947
1948         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1949                                            hw->period_bytes_min, hw->period_bytes_max);
1950         if (err < 0)
1951                 return err;
1952
1953         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1954                                            hw->periods_min, hw->periods_max);
1955         if (err < 0)
1956                 return err;
1957
1958         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1959                                            hw->period_bytes_min, hw->buffer_bytes_max);
1960         if (err < 0)
1961                 return err;
1962
1963         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 
1964                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
1965                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1966         if (err < 0)
1967                 return err;
1968
1969         /* FIXME: remove */
1970         if (runtime->dma_bytes) {
1971                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1972                 if (err < 0)
1973                         return -EINVAL;
1974         }
1975
1976         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1977                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
1978                                           snd_pcm_hw_rule_rate, hw,
1979                                           SNDRV_PCM_HW_PARAM_RATE, -1);
1980                 if (err < 0)
1981                         return err;
1982         }
1983
1984         /* FIXME: this belong to lowlevel */
1985         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1986
1987         return 0;
1988 }
1989
1990 static void pcm_release_private(struct snd_pcm_substream *substream)
1991 {
1992         snd_pcm_unlink(substream);
1993 }
1994
1995 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
1996 {
1997         substream->ref_count--;
1998         if (substream->ref_count > 0)
1999                 return;
2000
2001         snd_pcm_drop(substream);
2002         if (substream->hw_opened) {
2003                 if (substream->ops->hw_free != NULL)
2004                         substream->ops->hw_free(substream);
2005                 substream->ops->close(substream);
2006                 substream->hw_opened = 0;
2007         }
2008         if (pm_qos_request_active(&substream->latency_pm_qos_req))
2009                 pm_qos_remove_request(&substream->latency_pm_qos_req);
2010         if (substream->pcm_release) {
2011                 substream->pcm_release(substream);
2012                 substream->pcm_release = NULL;
2013         }
2014         snd_pcm_detach_substream(substream);
2015 }
2016
2017 EXPORT_SYMBOL(snd_pcm_release_substream);
2018
2019 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2020                            struct file *file,
2021                            struct snd_pcm_substream **rsubstream)
2022 {
2023         struct snd_pcm_substream *substream;
2024         int err;
2025
2026         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2027         if (err < 0)
2028                 return err;
2029         if (substream->ref_count > 1) {
2030                 *rsubstream = substream;
2031                 return 0;
2032         }
2033
2034         err = snd_pcm_hw_constraints_init(substream);
2035         if (err < 0) {
2036                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2037                 goto error;
2038         }
2039
2040         if ((err = substream->ops->open(substream)) < 0)
2041                 goto error;
2042
2043         substream->hw_opened = 1;
2044
2045         err = snd_pcm_hw_constraints_complete(substream);
2046         if (err < 0) {
2047                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2048                 goto error;
2049         }
2050
2051         *rsubstream = substream;
2052         return 0;
2053
2054  error:
2055         snd_pcm_release_substream(substream);
2056         return err;
2057 }
2058
2059 EXPORT_SYMBOL(snd_pcm_open_substream);
2060
2061 static int snd_pcm_open_file(struct file *file,
2062                              struct snd_pcm *pcm,
2063                              int stream,
2064                              struct snd_pcm_file **rpcm_file)
2065 {
2066         struct snd_pcm_file *pcm_file;
2067         struct snd_pcm_substream *substream;
2068         struct snd_pcm_str *str;
2069         int err;
2070
2071         if (rpcm_file)
2072                 *rpcm_file = NULL;
2073
2074         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2075         if (err < 0)
2076                 return err;
2077
2078         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2079         if (pcm_file == NULL) {
2080                 snd_pcm_release_substream(substream);
2081                 return -ENOMEM;
2082         }
2083         pcm_file->substream = substream;
2084         if (substream->ref_count == 1) {
2085                 str = substream->pstr;
2086                 substream->file = pcm_file;
2087                 substream->pcm_release = pcm_release_private;
2088         }
2089         file->private_data = pcm_file;
2090         if (rpcm_file)
2091                 *rpcm_file = pcm_file;
2092         return 0;
2093 }
2094
2095 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2096 {
2097         struct snd_pcm *pcm;
2098         int err = nonseekable_open(inode, file);
2099         if (err < 0)
2100                 return err;
2101         pcm = snd_lookup_minor_data(iminor(inode),
2102                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2103         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2104 }
2105
2106 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2107 {
2108         struct snd_pcm *pcm;
2109         int err = nonseekable_open(inode, file);
2110         if (err < 0)
2111                 return err;
2112         pcm = snd_lookup_minor_data(iminor(inode),
2113                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2114         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2115 }
2116
2117 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2118 {
2119         int err;
2120         struct snd_pcm_file *pcm_file;
2121         wait_queue_t wait;
2122
2123         if (pcm == NULL) {
2124                 err = -ENODEV;
2125                 goto __error1;
2126         }
2127         err = snd_card_file_add(pcm->card, file);
2128         if (err < 0)
2129                 goto __error1;
2130         if (!try_module_get(pcm->card->module)) {
2131                 err = -EFAULT;
2132                 goto __error2;
2133         }
2134         init_waitqueue_entry(&wait, current);
2135         add_wait_queue(&pcm->open_wait, &wait);
2136         mutex_lock(&pcm->open_mutex);
2137         while (1) {
2138                 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2139                 if (err >= 0)
2140                         break;
2141                 if (err == -EAGAIN) {
2142                         if (file->f_flags & O_NONBLOCK) {
2143                                 err = -EBUSY;
2144                                 break;
2145                         }
2146                 } else
2147                         break;
2148                 set_current_state(TASK_INTERRUPTIBLE);
2149                 mutex_unlock(&pcm->open_mutex);
2150                 schedule();
2151                 mutex_lock(&pcm->open_mutex);
2152                 if (signal_pending(current)) {
2153                         err = -ERESTARTSYS;
2154                         break;
2155                 }
2156         }
2157         remove_wait_queue(&pcm->open_wait, &wait);
2158         mutex_unlock(&pcm->open_mutex);
2159         if (err < 0)
2160                 goto __error;
2161         return err;
2162
2163       __error:
2164         module_put(pcm->card->module);
2165       __error2:
2166         snd_card_file_remove(pcm->card, file);
2167       __error1:
2168         return err;
2169 }
2170
2171 static int snd_pcm_release(struct inode *inode, struct file *file)
2172 {
2173         struct snd_pcm *pcm;
2174         struct snd_pcm_substream *substream;
2175         struct snd_pcm_file *pcm_file;
2176
2177         pcm_file = file->private_data;
2178         substream = pcm_file->substream;
2179         if (snd_BUG_ON(!substream))
2180                 return -ENXIO;
2181         pcm = substream->pcm;
2182         mutex_lock(&pcm->open_mutex);
2183         snd_pcm_release_substream(substream);
2184         kfree(pcm_file);
2185         mutex_unlock(&pcm->open_mutex);
2186         wake_up(&pcm->open_wait);
2187         module_put(pcm->card->module);
2188         snd_card_file_remove(pcm->card, file);
2189         return 0;
2190 }
2191
2192 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2193                                                  snd_pcm_uframes_t frames)
2194 {
2195         struct snd_pcm_runtime *runtime = substream->runtime;
2196         snd_pcm_sframes_t appl_ptr;
2197         snd_pcm_sframes_t ret;
2198         snd_pcm_sframes_t hw_avail;
2199
2200         if (frames == 0)
2201                 return 0;
2202
2203         snd_pcm_stream_lock_irq(substream);
2204         switch (runtime->status->state) {
2205         case SNDRV_PCM_STATE_PREPARED:
2206                 break;
2207         case SNDRV_PCM_STATE_DRAINING:
2208         case SNDRV_PCM_STATE_RUNNING:
2209                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2210                         break;
2211                 /* Fall through */
2212         case SNDRV_PCM_STATE_XRUN:
2213                 ret = -EPIPE;
2214                 goto __end;
2215         case SNDRV_PCM_STATE_SUSPENDED:
2216                 ret = -ESTRPIPE;
2217                 goto __end;
2218         default:
2219                 ret = -EBADFD;
2220                 goto __end;
2221         }
2222
2223         hw_avail = snd_pcm_playback_hw_avail(runtime);
2224         if (hw_avail <= 0) {
2225                 ret = 0;
2226                 goto __end;
2227         }
2228         if (frames > (snd_pcm_uframes_t)hw_avail)
2229                 frames = hw_avail;
2230         appl_ptr = runtime->control->appl_ptr - frames;
2231         if (appl_ptr < 0)
2232                 appl_ptr += runtime->boundary;
2233         runtime->control->appl_ptr = appl_ptr;
2234         ret = frames;
2235  __end:
2236         snd_pcm_stream_unlock_irq(substream);
2237         return ret;
2238 }
2239
2240 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2241                                                 snd_pcm_uframes_t frames)
2242 {
2243         struct snd_pcm_runtime *runtime = substream->runtime;
2244         snd_pcm_sframes_t appl_ptr;
2245         snd_pcm_sframes_t ret;
2246         snd_pcm_sframes_t hw_avail;
2247
2248         if (frames == 0)
2249                 return 0;
2250
2251         snd_pcm_stream_lock_irq(substream);
2252         switch (runtime->status->state) {
2253         case SNDRV_PCM_STATE_PREPARED:
2254         case SNDRV_PCM_STATE_DRAINING:
2255                 break;
2256         case SNDRV_PCM_STATE_RUNNING:
2257                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2258                         break;
2259                 /* Fall through */
2260         case SNDRV_PCM_STATE_XRUN:
2261                 ret = -EPIPE;
2262                 goto __end;
2263         case SNDRV_PCM_STATE_SUSPENDED:
2264                 ret = -ESTRPIPE;
2265                 goto __end;
2266         default:
2267                 ret = -EBADFD;
2268                 goto __end;
2269         }
2270
2271         hw_avail = snd_pcm_capture_hw_avail(runtime);
2272         if (hw_avail <= 0) {
2273                 ret = 0;
2274                 goto __end;
2275         }
2276         if (frames > (snd_pcm_uframes_t)hw_avail)
2277                 frames = hw_avail;
2278         appl_ptr = runtime->control->appl_ptr - frames;
2279         if (appl_ptr < 0)
2280                 appl_ptr += runtime->boundary;
2281         runtime->control->appl_ptr = appl_ptr;
2282         ret = frames;
2283  __end:
2284         snd_pcm_stream_unlock_irq(substream);
2285         return ret;
2286 }
2287
2288 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2289                                                   snd_pcm_uframes_t frames)
2290 {
2291         struct snd_pcm_runtime *runtime = substream->runtime;
2292         snd_pcm_sframes_t appl_ptr;
2293         snd_pcm_sframes_t ret;
2294         snd_pcm_sframes_t avail;
2295
2296         if (frames == 0)
2297                 return 0;
2298
2299         snd_pcm_stream_lock_irq(substream);
2300         switch (runtime->status->state) {
2301         case SNDRV_PCM_STATE_PREPARED:
2302         case SNDRV_PCM_STATE_PAUSED:
2303                 break;
2304         case SNDRV_PCM_STATE_DRAINING:
2305         case SNDRV_PCM_STATE_RUNNING:
2306                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2307                         break;
2308                 /* Fall through */
2309         case SNDRV_PCM_STATE_XRUN:
2310                 ret = -EPIPE;
2311                 goto __end;
2312         case SNDRV_PCM_STATE_SUSPENDED:
2313                 ret = -ESTRPIPE;
2314                 goto __end;
2315         default:
2316                 ret = -EBADFD;
2317                 goto __end;
2318         }
2319
2320         avail = snd_pcm_playback_avail(runtime);
2321         if (avail <= 0) {
2322                 ret = 0;
2323                 goto __end;
2324         }
2325         if (frames > (snd_pcm_uframes_t)avail)
2326                 frames = avail;
2327         appl_ptr = runtime->control->appl_ptr + frames;
2328         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2329                 appl_ptr -= runtime->boundary;
2330         runtime->control->appl_ptr = appl_ptr;
2331         ret = frames;
2332  __end:
2333         snd_pcm_stream_unlock_irq(substream);
2334         return ret;
2335 }
2336
2337 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2338                                                  snd_pcm_uframes_t frames)
2339 {
2340         struct snd_pcm_runtime *runtime = substream->runtime;
2341         snd_pcm_sframes_t appl_ptr;
2342         snd_pcm_sframes_t ret;
2343         snd_pcm_sframes_t avail;
2344
2345         if (frames == 0)
2346                 return 0;
2347
2348         snd_pcm_stream_lock_irq(substream);
2349         switch (runtime->status->state) {
2350         case SNDRV_PCM_STATE_PREPARED:
2351         case SNDRV_PCM_STATE_DRAINING:
2352         case SNDRV_PCM_STATE_PAUSED:
2353                 break;
2354         case SNDRV_PCM_STATE_RUNNING:
2355                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2356                         break;
2357                 /* Fall through */
2358         case SNDRV_PCM_STATE_XRUN:
2359                 ret = -EPIPE;
2360                 goto __end;
2361         case SNDRV_PCM_STATE_SUSPENDED:
2362                 ret = -ESTRPIPE;
2363                 goto __end;
2364         default:
2365                 ret = -EBADFD;
2366                 goto __end;
2367         }
2368
2369         avail = snd_pcm_capture_avail(runtime);
2370         if (avail <= 0) {
2371                 ret = 0;
2372                 goto __end;
2373         }
2374         if (frames > (snd_pcm_uframes_t)avail)
2375                 frames = avail;
2376         appl_ptr = runtime->control->appl_ptr + frames;
2377         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2378                 appl_ptr -= runtime->boundary;
2379         runtime->control->appl_ptr = appl_ptr;
2380         ret = frames;
2381  __end:
2382         snd_pcm_stream_unlock_irq(substream);
2383         return ret;
2384 }
2385
2386 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2387 {
2388         struct snd_pcm_runtime *runtime = substream->runtime;
2389         int err;
2390
2391         snd_pcm_stream_lock_irq(substream);
2392         switch (runtime->status->state) {
2393         case SNDRV_PCM_STATE_DRAINING:
2394                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2395                         goto __badfd;
2396         case SNDRV_PCM_STATE_RUNNING:
2397                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2398                         break;
2399                 /* Fall through */
2400         case SNDRV_PCM_STATE_PREPARED:
2401         case SNDRV_PCM_STATE_SUSPENDED:
2402                 err = 0;
2403                 break;
2404         case SNDRV_PCM_STATE_XRUN:
2405                 err = -EPIPE;
2406                 break;
2407         default:
2408               __badfd:
2409                 err = -EBADFD;
2410                 break;
2411         }
2412         snd_pcm_stream_unlock_irq(substream);
2413         return err;
2414 }
2415                 
2416 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2417                          snd_pcm_sframes_t __user *res)
2418 {
2419         struct snd_pcm_runtime *runtime = substream->runtime;
2420         int err;
2421         snd_pcm_sframes_t n = 0;
2422
2423         snd_pcm_stream_lock_irq(substream);
2424         switch (runtime->status->state) {
2425         case SNDRV_PCM_STATE_DRAINING:
2426                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2427                         goto __badfd;
2428         case SNDRV_PCM_STATE_RUNNING:
2429                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2430                         break;
2431                 /* Fall through */
2432         case SNDRV_PCM_STATE_PREPARED:
2433         case SNDRV_PCM_STATE_SUSPENDED:
2434                 err = 0;
2435                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2436                         n = snd_pcm_playback_hw_avail(runtime);
2437                 else
2438                         n = snd_pcm_capture_avail(runtime);
2439                 n += runtime->delay;
2440                 break;
2441         case SNDRV_PCM_STATE_XRUN:
2442                 err = -EPIPE;
2443                 break;
2444         default:
2445               __badfd:
2446                 err = -EBADFD;
2447                 break;
2448         }
2449         snd_pcm_stream_unlock_irq(substream);
2450         if (!err)
2451                 if (put_user(n, res))
2452                         err = -EFAULT;
2453         return err;
2454 }
2455                 
2456 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2457                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2458 {
2459         struct snd_pcm_runtime *runtime = substream->runtime;
2460         struct snd_pcm_sync_ptr sync_ptr;
2461         volatile struct snd_pcm_mmap_status *status;
2462         volatile struct snd_pcm_mmap_control *control;
2463         int err;
2464
2465         memset(&sync_ptr, 0, sizeof(sync_ptr));
2466         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2467                 return -EFAULT;
2468         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2469                 return -EFAULT; 
2470         status = runtime->status;
2471         control = runtime->control;
2472         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2473                 err = snd_pcm_hwsync(substream);
2474                 if (err < 0)
2475                         return err;
2476         }
2477         snd_pcm_stream_lock_irq(substream);
2478         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2479                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2480         else
2481                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2482         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2483                 control->avail_min = sync_ptr.c.control.avail_min;
2484         else
2485                 sync_ptr.c.control.avail_min = control->avail_min;
2486         sync_ptr.s.status.state = status->state;
2487         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2488         sync_ptr.s.status.tstamp = status->tstamp;
2489         sync_ptr.s.status.suspended_state = status->suspended_state;
2490         snd_pcm_stream_unlock_irq(substream);
2491         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2492                 return -EFAULT;
2493         return 0;
2494 }
2495
2496 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2497 {
2498         struct snd_pcm_runtime *runtime = substream->runtime;
2499         int arg;
2500         
2501         if (get_user(arg, _arg))
2502                 return -EFAULT;
2503         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2504                 return -EINVAL;
2505         runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2506         if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2507                 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2508         return 0;
2509 }
2510                 
2511 static int snd_pcm_common_ioctl1(struct file *file,
2512                                  struct snd_pcm_substream *substream,
2513                                  unsigned int cmd, void __user *arg)
2514 {
2515         switch (cmd) {
2516         case SNDRV_PCM_IOCTL_PVERSION:
2517                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2518         case SNDRV_PCM_IOCTL_INFO:
2519                 return snd_pcm_info_user(substream, arg);
2520         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2521                 return 0;
2522         case SNDRV_PCM_IOCTL_TTSTAMP:
2523                 return snd_pcm_tstamp(substream, arg);
2524         case SNDRV_PCM_IOCTL_HW_REFINE:
2525                 return snd_pcm_hw_refine_user(substream, arg);
2526         case SNDRV_PCM_IOCTL_HW_PARAMS:
2527                 return snd_pcm_hw_params_user(substream, arg);
2528         case SNDRV_PCM_IOCTL_HW_FREE:
2529                 return snd_pcm_hw_free(substream);
2530         case SNDRV_PCM_IOCTL_SW_PARAMS:
2531                 return snd_pcm_sw_params_user(substream, arg);
2532         case SNDRV_PCM_IOCTL_STATUS:
2533                 return snd_pcm_status_user(substream, arg);
2534         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2535                 return snd_pcm_channel_info_user(substream, arg);
2536         case SNDRV_PCM_IOCTL_PREPARE:
2537                 return snd_pcm_prepare(substream, file);
2538         case SNDRV_PCM_IOCTL_RESET:
2539                 return snd_pcm_reset(substream);
2540         case SNDRV_PCM_IOCTL_START:
2541                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2542         case SNDRV_PCM_IOCTL_LINK:
2543                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2544         case SNDRV_PCM_IOCTL_UNLINK:
2545                 return snd_pcm_unlink(substream);
2546         case SNDRV_PCM_IOCTL_RESUME:
2547                 return snd_pcm_resume(substream);
2548         case SNDRV_PCM_IOCTL_XRUN:
2549                 return snd_pcm_xrun(substream);
2550         case SNDRV_PCM_IOCTL_HWSYNC:
2551                 return snd_pcm_hwsync(substream);
2552         case SNDRV_PCM_IOCTL_DELAY:
2553                 return snd_pcm_delay(substream, arg);
2554         case SNDRV_PCM_IOCTL_SYNC_PTR:
2555                 return snd_pcm_sync_ptr(substream, arg);
2556 #ifdef CONFIG_SND_SUPPORT_OLD_API
2557         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2558                 return snd_pcm_hw_refine_old_user(substream, arg);
2559         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2560                 return snd_pcm_hw_params_old_user(substream, arg);
2561 #endif
2562         case SNDRV_PCM_IOCTL_DRAIN:
2563                 return snd_pcm_drain(substream, file);
2564         case SNDRV_PCM_IOCTL_DROP:
2565                 return snd_pcm_drop(substream);
2566         case SNDRV_PCM_IOCTL_PAUSE:
2567         {
2568                 int res;
2569                 snd_pcm_stream_lock_irq(substream);
2570                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2571                 snd_pcm_stream_unlock_irq(substream);
2572                 return res;
2573         }
2574         }
2575         snd_printd("unknown ioctl = 0x%x\n", cmd);
2576         return -ENOTTY;
2577 }
2578
2579 static int snd_pcm_playback_ioctl1(struct file *file,
2580                                    struct snd_pcm_substream *substream,
2581                                    unsigned int cmd, void __user *arg)
2582 {
2583         if (snd_BUG_ON(!substream))
2584                 return -ENXIO;
2585         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2586                 return -EINVAL;
2587         switch (cmd) {
2588         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2589         {
2590                 struct snd_xferi xferi;
2591                 struct snd_xferi __user *_xferi = arg;
2592                 struct snd_pcm_runtime *runtime = substream->runtime;
2593                 snd_pcm_sframes_t result;
2594                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2595                         return -EBADFD;
2596                 if (put_user(0, &_xferi->result))
2597                         return -EFAULT;
2598                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2599                         return -EFAULT;
2600                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2601                 __put_user(result, &_xferi->result);
2602                 return result < 0 ? result : 0;
2603         }
2604         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2605         {
2606                 struct snd_xfern xfern;
2607                 struct snd_xfern __user *_xfern = arg;
2608                 struct snd_pcm_runtime *runtime = substream->runtime;
2609                 void __user **bufs;
2610                 snd_pcm_sframes_t result;
2611                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2612                         return -EBADFD;
2613                 if (runtime->channels > 128)
2614                         return -EINVAL;
2615                 if (put_user(0, &_xfern->result))
2616                         return -EFAULT;
2617                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2618                         return -EFAULT;
2619
2620                 bufs = memdup_user(xfern.bufs,
2621                                    sizeof(void *) * runtime->channels);
2622                 if (IS_ERR(bufs))
2623                         return PTR_ERR(bufs);
2624                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2625                 kfree(bufs);
2626                 __put_user(result, &_xfern->result);
2627                 return result < 0 ? result : 0;
2628         }
2629         case SNDRV_PCM_IOCTL_REWIND:
2630         {
2631                 snd_pcm_uframes_t frames;
2632                 snd_pcm_uframes_t __user *_frames = arg;
2633                 snd_pcm_sframes_t result;
2634                 if (get_user(frames, _frames))
2635                         return -EFAULT;
2636                 if (put_user(0, _frames))
2637                         return -EFAULT;
2638                 result = snd_pcm_playback_rewind(substream, frames);
2639                 __put_user(result, _frames);
2640                 return result < 0 ? result : 0;
2641         }
2642         case SNDRV_PCM_IOCTL_FORWARD:
2643         {
2644                 snd_pcm_uframes_t frames;
2645                 snd_pcm_uframes_t __user *_frames = arg;
2646                 snd_pcm_sframes_t result;
2647                 if (get_user(frames, _frames))
2648                         return -EFAULT;
2649                 if (put_user(0, _frames))
2650                         return -EFAULT;
2651                 result = snd_pcm_playback_forward(substream, frames);
2652                 __put_user(result, _frames);
2653                 return result < 0 ? result : 0;
2654         }
2655         }
2656         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2657 }
2658
2659 static int snd_pcm_capture_ioctl1(struct file *file,
2660                                   struct snd_pcm_substream *substream,
2661                                   unsigned int cmd, void __user *arg)
2662 {
2663         if (snd_BUG_ON(!substream))
2664                 return -ENXIO;
2665         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2666                 return -EINVAL;
2667         switch (cmd) {
2668         case SNDRV_PCM_IOCTL_READI_FRAMES:
2669         {
2670                 struct snd_xferi xferi;
2671                 struct snd_xferi __user *_xferi = arg;
2672                 struct snd_pcm_runtime *runtime = substream->runtime;
2673                 snd_pcm_sframes_t result;
2674                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2675                         return -EBADFD;
2676                 if (put_user(0, &_xferi->result))
2677                         return -EFAULT;
2678                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2679                         return -EFAULT;
2680                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2681                 __put_user(result, &_xferi->result);
2682                 return result < 0 ? result : 0;
2683         }
2684         case SNDRV_PCM_IOCTL_READN_FRAMES:
2685         {
2686                 struct snd_xfern xfern;
2687                 struct snd_xfern __user *_xfern = arg;
2688                 struct snd_pcm_runtime *runtime = substream->runtime;
2689                 void *bufs;
2690                 snd_pcm_sframes_t result;
2691                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2692                         return -EBADFD;
2693                 if (runtime->channels > 128)
2694                         return -EINVAL;
2695                 if (put_user(0, &_xfern->result))
2696                         return -EFAULT;
2697                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2698                         return -EFAULT;
2699
2700                 bufs = memdup_user(xfern.bufs,
2701                                    sizeof(void *) * runtime->channels);
2702                 if (IS_ERR(bufs))
2703                         return PTR_ERR(bufs);
2704                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2705                 kfree(bufs);
2706                 __put_user(result, &_xfern->result);
2707                 return result < 0 ? result : 0;
2708         }
2709         case SNDRV_PCM_IOCTL_REWIND:
2710         {
2711                 snd_pcm_uframes_t frames;
2712                 snd_pcm_uframes_t __user *_frames = arg;
2713                 snd_pcm_sframes_t result;
2714                 if (get_user(frames, _frames))
2715                         return -EFAULT;
2716                 if (put_user(0, _frames))
2717                         return -EFAULT;
2718                 result = snd_pcm_capture_rewind(substream, frames);
2719                 __put_user(result, _frames);
2720                 return result < 0 ? result : 0;
2721         }
2722         case SNDRV_PCM_IOCTL_FORWARD:
2723         {
2724                 snd_pcm_uframes_t frames;
2725                 snd_pcm_uframes_t __user *_frames = arg;
2726                 snd_pcm_sframes_t result;
2727                 if (get_user(frames, _frames))
2728                         return -EFAULT;
2729                 if (put_user(0, _frames))
2730                         return -EFAULT;
2731                 result = snd_pcm_capture_forward(substream, frames);
2732                 __put_user(result, _frames);
2733                 return result < 0 ? result : 0;
2734         }
2735         }
2736         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2737 }
2738
2739 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2740                                    unsigned long arg)
2741 {
2742         struct snd_pcm_file *pcm_file;
2743
2744         pcm_file = file->private_data;
2745
2746         if (((cmd >> 8) & 0xff) != 'A')
2747                 return -ENOTTY;
2748
2749         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2750                                        (void __user *)arg);
2751 }
2752
2753 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2754                                   unsigned long arg)
2755 {
2756         struct snd_pcm_file *pcm_file;
2757
2758         pcm_file = file->private_data;
2759
2760         if (((cmd >> 8) & 0xff) != 'A')
2761                 return -ENOTTY;
2762
2763         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2764                                       (void __user *)arg);
2765 }
2766
2767 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2768                          unsigned int cmd, void *arg)
2769 {
2770         mm_segment_t fs;
2771         int result;
2772         
2773         fs = snd_enter_user();
2774         switch (substream->stream) {
2775         case SNDRV_PCM_STREAM_PLAYBACK:
2776                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2777                                                  (void __user *)arg);
2778                 break;
2779         case SNDRV_PCM_STREAM_CAPTURE:
2780                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2781                                                 (void __user *)arg);
2782                 break;
2783         default:
2784                 result = -EINVAL;
2785                 break;
2786         }
2787         snd_leave_user(fs);
2788         return result;
2789 }
2790
2791 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2792
2793 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2794                             loff_t * offset)
2795 {
2796         struct snd_pcm_file *pcm_file;
2797         struct snd_pcm_substream *substream;
2798         struct snd_pcm_runtime *runtime;
2799         snd_pcm_sframes_t result;
2800
2801         pcm_file = file->private_data;
2802         substream = pcm_file->substream;
2803         if (PCM_RUNTIME_CHECK(substream))
2804                 return -ENXIO;
2805         runtime = substream->runtime;
2806         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2807                 return -EBADFD;
2808         if (!frame_aligned(runtime, count))
2809                 return -EINVAL;
2810         count = bytes_to_frames(runtime, count);
2811         result = snd_pcm_lib_read(substream, buf, count);
2812         if (result > 0)
2813                 result = frames_to_bytes(runtime, result);
2814         return result;
2815 }
2816
2817 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2818                              size_t count, loff_t * offset)
2819 {
2820         struct snd_pcm_file *pcm_file;
2821         struct snd_pcm_substream *substream;
2822         struct snd_pcm_runtime *runtime;
2823         snd_pcm_sframes_t result;
2824
2825         pcm_file = file->private_data;
2826         substream = pcm_file->substream;
2827         if (PCM_RUNTIME_CHECK(substream))
2828                 return -ENXIO;
2829         runtime = substream->runtime;
2830         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2831                 return -EBADFD;
2832         if (!frame_aligned(runtime, count))
2833                 return -EINVAL;
2834         count = bytes_to_frames(runtime, count);
2835         result = snd_pcm_lib_write(substream, buf, count);
2836         if (result > 0)
2837                 result = frames_to_bytes(runtime, result);
2838         return result;
2839 }
2840
2841 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2842                              unsigned long nr_segs, loff_t pos)
2843
2844 {
2845         struct snd_pcm_file *pcm_file;
2846         struct snd_pcm_substream *substream;
2847         struct snd_pcm_runtime *runtime;
2848         snd_pcm_sframes_t result;
2849         unsigned long i;
2850         void __user **bufs;
2851         snd_pcm_uframes_t frames;
2852
2853         pcm_file = iocb->ki_filp->private_data;
2854         substream = pcm_file->substream;
2855         if (PCM_RUNTIME_CHECK(substream))
2856                 return -ENXIO;
2857         runtime = substream->runtime;
2858         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2859                 return -EBADFD;
2860         if (nr_segs > 1024 || nr_segs != runtime->channels)
2861                 return -EINVAL;
2862         if (!frame_aligned(runtime, iov->iov_len))
2863                 return -EINVAL;
2864         frames = bytes_to_samples(runtime, iov->iov_len);
2865         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2866         if (bufs == NULL)
2867                 return -ENOMEM;
2868         for (i = 0; i < nr_segs; ++i)
2869                 bufs[i] = iov[i].iov_base;
2870         result = snd_pcm_lib_readv(substream, bufs, frames);
2871         if (result > 0)
2872                 result = frames_to_bytes(runtime, result);
2873         kfree(bufs);
2874         return result;
2875 }
2876
2877 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2878                               unsigned long nr_segs, loff_t pos)
2879 {
2880         struct snd_pcm_file *pcm_file;
2881         struct snd_pcm_substream *substream;
2882         struct snd_pcm_runtime *runtime;
2883         snd_pcm_sframes_t result;
2884         unsigned long i;
2885         void __user **bufs;
2886         snd_pcm_uframes_t frames;
2887
2888         pcm_file = iocb->ki_filp->private_data;
2889         substream = pcm_file->substream;
2890         if (PCM_RUNTIME_CHECK(substream))
2891                 return -ENXIO;
2892         runtime = substream->runtime;
2893         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2894                 return -EBADFD;
2895         if (nr_segs > 128 || nr_segs != runtime->channels ||
2896             !frame_aligned(runtime, iov->iov_len))
2897                 return -EINVAL;
2898         frames = bytes_to_samples(runtime, iov->iov_len);
2899         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2900         if (bufs == NULL)
2901                 return -ENOMEM;
2902         for (i = 0; i < nr_segs; ++i)
2903                 bufs[i] = iov[i].iov_base;
2904         result = snd_pcm_lib_writev(substream, bufs, frames);
2905         if (result > 0)
2906                 result = frames_to_bytes(runtime, result);
2907         kfree(bufs);
2908         return result;
2909 }
2910
2911 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2912 {
2913         struct snd_pcm_file *pcm_file;
2914         struct snd_pcm_substream *substream;
2915         struct snd_pcm_runtime *runtime;
2916         unsigned int mask;
2917         snd_pcm_uframes_t avail;
2918
2919         pcm_file = file->private_data;
2920
2921         substream = pcm_file->substream;
2922         if (PCM_RUNTIME_CHECK(substream))
2923                 return -ENXIO;
2924         runtime = substream->runtime;
2925
2926         poll_wait(file, &runtime->sleep, wait);
2927
2928         snd_pcm_stream_lock_irq(substream);
2929         avail = snd_pcm_playback_avail(runtime);
2930         switch (runtime->status->state) {
2931         case SNDRV_PCM_STATE_RUNNING:
2932         case SNDRV_PCM_STATE_PREPARED:
2933         case SNDRV_PCM_STATE_PAUSED:
2934                 if (avail >= runtime->control->avail_min) {
2935                         mask = POLLOUT | POLLWRNORM;
2936                         break;
2937                 }
2938                 /* Fall through */
2939         case SNDRV_PCM_STATE_DRAINING:
2940                 mask = 0;
2941                 break;
2942         default:
2943                 mask = POLLOUT | POLLWRNORM | POLLERR;
2944                 break;
2945         }
2946         snd_pcm_stream_unlock_irq(substream);
2947         return mask;
2948 }
2949
2950 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2951 {
2952         struct snd_pcm_file *pcm_file;
2953         struct snd_pcm_substream *substream;
2954         struct snd_pcm_runtime *runtime;
2955         unsigned int mask;
2956         snd_pcm_uframes_t avail;
2957
2958         pcm_file = file->private_data;
2959
2960         substream = pcm_file->substream;
2961         if (PCM_RUNTIME_CHECK(substream))
2962                 return -ENXIO;
2963         runtime = substream->runtime;
2964
2965         poll_wait(file, &runtime->sleep, wait);
2966
2967         snd_pcm_stream_lock_irq(substream);
2968         avail = snd_pcm_capture_avail(runtime);
2969         switch (runtime->status->state) {
2970         case SNDRV_PCM_STATE_RUNNING:
2971         case SNDRV_PCM_STATE_PREPARED:
2972         case SNDRV_PCM_STATE_PAUSED:
2973                 if (avail >= runtime->control->avail_min) {
2974                         mask = POLLIN | POLLRDNORM;
2975                         break;
2976                 }
2977                 mask = 0;
2978                 break;
2979         case SNDRV_PCM_STATE_DRAINING:
2980                 if (avail > 0) {
2981                         mask = POLLIN | POLLRDNORM;
2982                         break;
2983                 }
2984                 /* Fall through */
2985         default:
2986                 mask = POLLIN | POLLRDNORM | POLLERR;
2987                 break;
2988         }
2989         snd_pcm_stream_unlock_irq(substream);
2990         return mask;
2991 }
2992
2993 /*
2994  * mmap support
2995  */
2996
2997 /*
2998  * Only on coherent architectures, we can mmap the status and the control records
2999  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3000  */
3001 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3002 /*
3003  * mmap status record
3004  */
3005 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3006                                                 struct vm_fault *vmf)
3007 {
3008         struct snd_pcm_substream *substream = area->vm_private_data;
3009         struct snd_pcm_runtime *runtime;
3010         
3011         if (substream == NULL)
3012                 return VM_FAULT_SIGBUS;
3013         runtime = substream->runtime;
3014         vmf->page = virt_to_page(runtime->status);
3015         get_page(vmf->page);
3016         return 0;
3017 }
3018
3019 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3020 {
3021         .fault =        snd_pcm_mmap_status_fault,
3022 };
3023
3024 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3025                                struct vm_area_struct *area)
3026 {
3027         struct snd_pcm_runtime *runtime;
3028         long size;
3029         if (!(area->vm_flags & VM_READ))
3030                 return -EINVAL;
3031         runtime = substream->runtime;
3032         size = area->vm_end - area->vm_start;
3033         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3034                 return -EINVAL;
3035         area->vm_ops = &snd_pcm_vm_ops_status;
3036         area->vm_private_data = substream;
3037         area->vm_flags |= VM_RESERVED;
3038         return 0;
3039 }
3040
3041 /*
3042  * mmap control record
3043  */
3044 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3045                                                 struct vm_fault *vmf)
3046 {
3047         struct snd_pcm_substream *substream = area->vm_private_data;
3048         struct snd_pcm_runtime *runtime;
3049         
3050         if (substream == NULL)
3051                 return VM_FAULT_SIGBUS;
3052         runtime = substream->runtime;
3053         vmf->page = virt_to_page(runtime->control);
3054         get_page(vmf->page);
3055         return 0;
3056 }
3057
3058 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3059 {
3060         .fault =        snd_pcm_mmap_control_fault,
3061 };
3062
3063 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3064                                 struct vm_area_struct *area)
3065 {
3066         struct snd_pcm_runtime *runtime;
3067         long size;
3068         if (!(area->vm_flags & VM_READ))
3069                 return -EINVAL;
3070         runtime = substream->runtime;
3071         size = area->vm_end - area->vm_start;
3072         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3073                 return -EINVAL;
3074         area->vm_ops = &snd_pcm_vm_ops_control;
3075         area->vm_private_data = substream;
3076         area->vm_flags |= VM_RESERVED;
3077         return 0;
3078 }
3079 #else /* ! coherent mmap */
3080 /*
3081  * don't support mmap for status and control records.
3082  */
3083 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3084                                struct vm_area_struct *area)
3085 {
3086         return -ENXIO;
3087 }
3088 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3089                                 struct vm_area_struct *area)
3090 {
3091         return -ENXIO;
3092 }
3093 #endif /* coherent mmap */
3094
3095 static inline struct page *
3096 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3097 {
3098         void *vaddr = substream->runtime->dma_area + ofs;
3099 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3100         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3101                 return virt_to_page(CAC_ADDR(vaddr));
3102 #endif
3103 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3104         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3105                 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3106                 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3107                 /* assume dma_handle set via pfn_to_phys() in
3108                  * mm/dma-noncoherent.c
3109                  */
3110                 return pfn_to_page(addr >> PAGE_SHIFT);
3111         }
3112 #endif
3113         return virt_to_page(vaddr);
3114 }
3115
3116 /*
3117  * fault callback for mmapping a RAM page
3118  */
3119 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3120                                                 struct vm_fault *vmf)
3121 {
3122         struct snd_pcm_substream *substream = area->vm_private_data;
3123         struct snd_pcm_runtime *runtime;
3124         unsigned long offset;
3125         struct page * page;
3126         size_t dma_bytes;
3127         
3128         if (substream == NULL)
3129                 return VM_FAULT_SIGBUS;
3130         runtime = substream->runtime;
3131         offset = vmf->pgoff << PAGE_SHIFT;
3132         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3133         if (offset > dma_bytes - PAGE_SIZE)
3134                 return VM_FAULT_SIGBUS;
3135         if (substream->ops->page)
3136                 page = substream->ops->page(substream, offset);
3137         else
3138                 page = snd_pcm_default_page_ops(substream, offset);
3139         if (!page)
3140                 return VM_FAULT_SIGBUS;
3141         get_page(page);
3142         vmf->page = page;
3143         return 0;
3144 }
3145
3146 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3147         .open =         snd_pcm_mmap_data_open,
3148         .close =        snd_pcm_mmap_data_close,
3149 };
3150
3151 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3152         .open =         snd_pcm_mmap_data_open,
3153         .close =        snd_pcm_mmap_data_close,
3154         .fault =        snd_pcm_mmap_data_fault,
3155 };
3156
3157 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3158 /* This should be defined / handled globally! */
3159 #ifdef CONFIG_ARM
3160 #define ARCH_HAS_DMA_MMAP_COHERENT
3161 #endif
3162 #endif
3163
3164 /*
3165  * mmap the DMA buffer on RAM
3166  */
3167 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3168                                 struct vm_area_struct *area)
3169 {
3170         area->vm_flags |= VM_RESERVED;
3171 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3172         if (!substream->ops->page &&
3173             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3174                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3175                                          area,
3176                                          substream->runtime->dma_area,
3177                                          substream->runtime->dma_addr,
3178                                          area->vm_end - area->vm_start);
3179 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3180         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3181             !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3182                 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3183 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3184         /* mmap with fault handler */
3185         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3186         return 0;
3187 }
3188
3189 /*
3190  * mmap the DMA buffer on I/O memory area
3191  */
3192 #if SNDRV_PCM_INFO_MMAP_IOMEM
3193 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3194                            struct vm_area_struct *area)
3195 {
3196         long size;
3197         unsigned long offset;
3198
3199         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3200         area->vm_flags |= VM_IO;
3201         size = area->vm_end - area->vm_start;
3202         offset = area->vm_pgoff << PAGE_SHIFT;
3203         if (io_remap_pfn_range(area, area->vm_start,
3204                                 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3205                                 size, area->vm_page_prot))
3206                 return -EAGAIN;
3207         return 0;
3208 }
3209
3210 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3211 #endif /* SNDRV_PCM_INFO_MMAP */
3212
3213 /*
3214  * mmap DMA buffer
3215  */
3216 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3217                       struct vm_area_struct *area)
3218 {
3219         struct snd_pcm_runtime *runtime;
3220         long size;
3221         unsigned long offset;
3222         size_t dma_bytes;
3223         int err;
3224
3225         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3226                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3227                         return -EINVAL;
3228         } else {
3229                 if (!(area->vm_flags & VM_READ))
3230                         return -EINVAL;
3231         }
3232         runtime = substream->runtime;
3233         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3234                 return -EBADFD;
3235         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3236                 return -ENXIO;
3237         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3238             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3239                 return -EINVAL;
3240         size = area->vm_end - area->vm_start;
3241         offset = area->vm_pgoff << PAGE_SHIFT;
3242         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3243         if ((size_t)size > dma_bytes)
3244                 return -EINVAL;
3245         if (offset > dma_bytes - size)
3246                 return -EINVAL;
3247
3248         area->vm_ops = &snd_pcm_vm_ops_data;
3249         area->vm_private_data = substream;
3250         if (substream->ops->mmap)
3251                 err = substream->ops->mmap(substream, area);
3252         else
3253                 err = snd_pcm_default_mmap(substream, area);
3254         if (!err)
3255                 atomic_inc(&substream->mmap_count);
3256         return err;
3257 }
3258
3259 EXPORT_SYMBOL(snd_pcm_mmap_data);
3260
3261 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3262 {
3263         struct snd_pcm_file * pcm_file;
3264         struct snd_pcm_substream *substream;    
3265         unsigned long offset;
3266         
3267         pcm_file = file->private_data;
3268         substream = pcm_file->substream;
3269         if (PCM_RUNTIME_CHECK(substream))
3270                 return -ENXIO;
3271
3272         offset = area->vm_pgoff << PAGE_SHIFT;
3273         switch (offset) {
3274         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3275                 if (pcm_file->no_compat_mmap)
3276                         return -ENXIO;
3277                 return snd_pcm_mmap_status(substream, file, area);
3278         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3279                 if (pcm_file->no_compat_mmap)
3280                         return -ENXIO;
3281                 return snd_pcm_mmap_control(substream, file, area);
3282         default:
3283                 return snd_pcm_mmap_data(substream, file, area);
3284         }
3285         return 0;
3286 }
3287
3288 static int snd_pcm_fasync(int fd, struct file * file, int on)
3289 {
3290         struct snd_pcm_file * pcm_file;
3291         struct snd_pcm_substream *substream;
3292         struct snd_pcm_runtime *runtime;
3293
3294         pcm_file = file->private_data;
3295         substream = pcm_file->substream;
3296         if (PCM_RUNTIME_CHECK(substream))
3297                 return -ENXIO;
3298         runtime = substream->runtime;
3299         return fasync_helper(fd, file, on, &runtime->fasync);
3300 }
3301
3302 /*
3303  * ioctl32 compat
3304  */
3305 #ifdef CONFIG_COMPAT
3306 #include "pcm_compat.c"
3307 #else
3308 #define snd_pcm_ioctl_compat    NULL
3309 #endif
3310
3311 /*
3312  *  To be removed helpers to keep binary compatibility
3313  */
3314
3315 #ifdef CONFIG_SND_SUPPORT_OLD_API
3316 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3317 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3318
3319 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3320                                                struct snd_pcm_hw_params_old *oparams)
3321 {
3322         unsigned int i;
3323
3324         memset(params, 0, sizeof(*params));
3325         params->flags = oparams->flags;
3326         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3327                 params->masks[i].bits[0] = oparams->masks[i];
3328         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3329         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3330         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3331         params->info = oparams->info;
3332         params->msbits = oparams->msbits;
3333         params->rate_num = oparams->rate_num;
3334         params->rate_den = oparams->rate_den;
3335         params->fifo_size = oparams->fifo_size;
3336 }
3337
3338 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3339                                              struct snd_pcm_hw_params *params)
3340 {
3341         unsigned int i;
3342
3343         memset(oparams, 0, sizeof(*oparams));
3344         oparams->flags = params->flags;
3345         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3346                 oparams->masks[i] = params->masks[i].bits[0];
3347         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3348         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3349         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3350         oparams->info = params->info;
3351         oparams->msbits = params->msbits;
3352         oparams->rate_num = params->rate_num;
3353         oparams->rate_den = params->rate_den;
3354         oparams->fifo_size = params->fifo_size;
3355 }
3356
3357 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3358                                       struct snd_pcm_hw_params_old __user * _oparams)
3359 {
3360         struct snd_pcm_hw_params *params;
3361         struct snd_pcm_hw_params_old *oparams = NULL;
3362         int err;
3363
3364         params = kmalloc(sizeof(*params), GFP_KERNEL);
3365         if (!params)
3366                 return -ENOMEM;
3367
3368         oparams = memdup_user(_oparams, sizeof(*oparams));
3369         if (IS_ERR(oparams)) {
3370                 err = PTR_ERR(oparams);
3371                 goto out;
3372         }
3373         snd_pcm_hw_convert_from_old_params(params, oparams);
3374         err = snd_pcm_hw_refine(substream, params);
3375         snd_pcm_hw_convert_to_old_params(oparams, params);
3376         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3377                 if (!err)
3378                         err = -EFAULT;
3379         }
3380
3381         kfree(oparams);
3382 out:
3383         kfree(params);
3384         return err;
3385 }
3386
3387 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3388                                       struct snd_pcm_hw_params_old __user * _oparams)
3389 {
3390         struct snd_pcm_hw_params *params;
3391         struct snd_pcm_hw_params_old *oparams = NULL;
3392         int err;
3393
3394         params = kmalloc(sizeof(*params), GFP_KERNEL);
3395         if (!params)
3396                 return -ENOMEM;
3397
3398         oparams = memdup_user(_oparams, sizeof(*oparams));
3399         if (IS_ERR(oparams)) {
3400                 err = PTR_ERR(oparams);
3401                 goto out;
3402         }
3403         snd_pcm_hw_convert_from_old_params(params, oparams);
3404         err = snd_pcm_hw_params(substream, params);
3405         snd_pcm_hw_convert_to_old_params(oparams, params);
3406         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3407                 if (!err)
3408                         err = -EFAULT;
3409         }
3410
3411         kfree(oparams);
3412 out:
3413         kfree(params);
3414         return err;
3415 }
3416 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3417
3418 #ifndef CONFIG_MMU
3419 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3420                                                unsigned long addr,
3421                                                unsigned long len,
3422                                                unsigned long pgoff,
3423                                                unsigned long flags)
3424 {
3425         struct snd_pcm_file *pcm_file = file->private_data;
3426         struct snd_pcm_substream *substream = pcm_file->substream;
3427         struct snd_pcm_runtime *runtime = substream->runtime;
3428         unsigned long offset = pgoff << PAGE_SHIFT;
3429
3430         switch (offset) {
3431         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3432                 return (unsigned long)runtime->status;
3433         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3434                 return (unsigned long)runtime->control;
3435         default:
3436                 return (unsigned long)runtime->dma_area + offset;
3437         }
3438 }
3439 #else
3440 # define snd_pcm_get_unmapped_area NULL
3441 #endif
3442
3443 /*
3444  *  Register section
3445  */
3446
3447 const struct file_operations snd_pcm_f_ops[2] = {
3448         {
3449                 .owner =                THIS_MODULE,
3450                 .write =                snd_pcm_write,
3451                 .aio_write =            snd_pcm_aio_write,
3452                 .open =                 snd_pcm_playback_open,
3453                 .release =              snd_pcm_release,
3454                 .llseek =               no_llseek,
3455                 .poll =                 snd_pcm_playback_poll,
3456                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3457                 .compat_ioctl =         snd_pcm_ioctl_compat,
3458                 .mmap =                 snd_pcm_mmap,
3459                 .fasync =               snd_pcm_fasync,
3460                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3461         },
3462         {
3463                 .owner =                THIS_MODULE,
3464                 .read =                 snd_pcm_read,
3465                 .aio_read =             snd_pcm_aio_read,
3466                 .open =                 snd_pcm_capture_open,
3467                 .release =              snd_pcm_release,
3468                 .llseek =               no_llseek,
3469                 .poll =                 snd_pcm_capture_poll,
3470                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3471                 .compat_ioctl =         snd_pcm_ioctl_compat,
3472                 .mmap =                 snd_pcm_mmap,
3473                 .fasync =               snd_pcm_fasync,
3474                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3475         }
3476 };