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TOMOYO Linux Cross Reference
Linux/sound/core/oss/pcm_oss.c

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  1 /*
  2  *  Digital Audio (PCM) abstract layer / OSS compatible
  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 #if 0
 23 #define PLUGIN_DEBUG
 24 #endif
 25 #if 0
 26 #define OSS_DEBUG
 27 #endif
 28 
 29 #include <linux/init.h>
 30 #include <linux/slab.h>
 31 #include <linux/sched/signal.h>
 32 #include <linux/time.h>
 33 #include <linux/vmalloc.h>
 34 #include <linux/module.h>
 35 #include <linux/math64.h>
 36 #include <linux/string.h>
 37 #include <linux/compat.h>
 38 #include <sound/core.h>
 39 #include <sound/minors.h>
 40 #include <sound/pcm.h>
 41 #include <sound/pcm_params.h>
 42 #include "pcm_plugin.h"
 43 #include <sound/info.h>
 44 #include <linux/soundcard.h>
 45 #include <sound/initval.h>
 46 #include <sound/mixer_oss.h>
 47 
 48 #define OSS_ALSAEMULVER         _SIOR ('M', 249, int)
 49 
 50 static int dsp_map[SNDRV_CARDS];
 51 static int adsp_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
 52 static bool nonblock_open = 1;
 53 
 54 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
 55 MODULE_DESCRIPTION("PCM OSS emulation for ALSA.");
 56 MODULE_LICENSE("GPL");
 57 module_param_array(dsp_map, int, NULL, 0444);
 58 MODULE_PARM_DESC(dsp_map, "PCM device number assigned to 1st OSS device.");
 59 module_param_array(adsp_map, int, NULL, 0444);
 60 MODULE_PARM_DESC(adsp_map, "PCM device number assigned to 2nd OSS device.");
 61 module_param(nonblock_open, bool, 0644);
 62 MODULE_PARM_DESC(nonblock_open, "Don't block opening busy PCM devices.");
 63 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM);
 64 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM1);
 65 
 66 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file);
 67 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file);
 68 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file);
 69 
 70 /*
 71  * helper functions to process hw_params
 72  */
 73 static int snd_interval_refine_min(struct snd_interval *i, unsigned int min, int openmin)
 74 {
 75         int changed = 0;
 76         if (i->min < min) {
 77                 i->min = min;
 78                 i->openmin = openmin;
 79                 changed = 1;
 80         } else if (i->min == min && !i->openmin && openmin) {
 81                 i->openmin = 1;
 82                 changed = 1;
 83         }
 84         if (i->integer) {
 85                 if (i->openmin) {
 86                         i->min++;
 87                         i->openmin = 0;
 88                 }
 89         }
 90         if (snd_interval_checkempty(i)) {
 91                 snd_interval_none(i);
 92                 return -EINVAL;
 93         }
 94         return changed;
 95 }
 96 
 97 static int snd_interval_refine_max(struct snd_interval *i, unsigned int max, int openmax)
 98 {
 99         int changed = 0;
100         if (i->max > max) {
101                 i->max = max;
102                 i->openmax = openmax;
103                 changed = 1;
104         } else if (i->max == max && !i->openmax && openmax) {
105                 i->openmax = 1;
106                 changed = 1;
107         }
108         if (i->integer) {
109                 if (i->openmax) {
110                         i->max--;
111                         i->openmax = 0;
112                 }
113         }
114         if (snd_interval_checkempty(i)) {
115                 snd_interval_none(i);
116                 return -EINVAL;
117         }
118         return changed;
119 }
120 
121 static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
122 {
123         struct snd_interval t;
124         t.empty = 0;
125         t.min = t.max = val;
126         t.openmin = t.openmax = 0;
127         t.integer = 1;
128         return snd_interval_refine(i, &t);
129 }
130 
131 /**
132  * snd_pcm_hw_param_value_min
133  * @params: the hw_params instance
134  * @var: parameter to retrieve
135  * @dir: pointer to the direction (-1,0,1) or NULL
136  *
137  * Return the minimum value for field PAR.
138  */
139 static unsigned int
140 snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params *params,
141                            snd_pcm_hw_param_t var, int *dir)
142 {
143         if (hw_is_mask(var)) {
144                 if (dir)
145                         *dir = 0;
146                 return snd_mask_min(hw_param_mask_c(params, var));
147         }
148         if (hw_is_interval(var)) {
149                 const struct snd_interval *i = hw_param_interval_c(params, var);
150                 if (dir)
151                         *dir = i->openmin;
152                 return snd_interval_min(i);
153         }
154         return -EINVAL;
155 }
156 
157 /**
158  * snd_pcm_hw_param_value_max
159  * @params: the hw_params instance
160  * @var: parameter to retrieve
161  * @dir: pointer to the direction (-1,0,1) or NULL
162  *
163  * Return the maximum value for field PAR.
164  */
165 static unsigned int
166 snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params *params,
167                            snd_pcm_hw_param_t var, int *dir)
168 {
169         if (hw_is_mask(var)) {
170                 if (dir)
171                         *dir = 0;
172                 return snd_mask_max(hw_param_mask_c(params, var));
173         }
174         if (hw_is_interval(var)) {
175                 const struct snd_interval *i = hw_param_interval_c(params, var);
176                 if (dir)
177                         *dir = - (int) i->openmax;
178                 return snd_interval_max(i);
179         }
180         return -EINVAL;
181 }
182 
183 static int _snd_pcm_hw_param_mask(struct snd_pcm_hw_params *params,
184                                   snd_pcm_hw_param_t var,
185                                   const struct snd_mask *val)
186 {
187         int changed;
188         changed = snd_mask_refine(hw_param_mask(params, var), val);
189         if (changed > 0) {
190                 params->cmask |= 1 << var;
191                 params->rmask |= 1 << var;
192         }
193         return changed;
194 }
195 
196 static int snd_pcm_hw_param_mask(struct snd_pcm_substream *pcm,
197                                  struct snd_pcm_hw_params *params,
198                                  snd_pcm_hw_param_t var,
199                                  const struct snd_mask *val)
200 {
201         int changed = _snd_pcm_hw_param_mask(params, var, val);
202         if (changed < 0)
203                 return changed;
204         if (params->rmask) {
205                 int err = snd_pcm_hw_refine(pcm, params);
206                 if (err < 0)
207                         return err;
208         }
209         return 0;
210 }
211 
212 static int _snd_pcm_hw_param_min(struct snd_pcm_hw_params *params,
213                                  snd_pcm_hw_param_t var, unsigned int val,
214                                  int dir)
215 {
216         int changed;
217         int open = 0;
218         if (dir) {
219                 if (dir > 0) {
220                         open = 1;
221                 } else if (dir < 0) {
222                         if (val > 0) {
223                                 open = 1;
224                                 val--;
225                         }
226                 }
227         }
228         if (hw_is_mask(var))
229                 changed = snd_mask_refine_min(hw_param_mask(params, var),
230                                               val + !!open);
231         else if (hw_is_interval(var))
232                 changed = snd_interval_refine_min(hw_param_interval(params, var),
233                                                   val, open);
234         else
235                 return -EINVAL;
236         if (changed > 0) {
237                 params->cmask |= 1 << var;
238                 params->rmask |= 1 << var;
239         }
240         return changed;
241 }
242 
243 /**
244  * snd_pcm_hw_param_min
245  * @pcm: PCM instance
246  * @params: the hw_params instance
247  * @var: parameter to retrieve
248  * @val: minimal value
249  * @dir: pointer to the direction (-1,0,1) or NULL
250  *
251  * Inside configuration space defined by PARAMS remove from PAR all 
252  * values < VAL. Reduce configuration space accordingly.
253  * Return new minimum or -EINVAL if the configuration space is empty
254  */
255 static int snd_pcm_hw_param_min(struct snd_pcm_substream *pcm,
256                                 struct snd_pcm_hw_params *params,
257                                 snd_pcm_hw_param_t var, unsigned int val,
258                                 int *dir)
259 {
260         int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
261         if (changed < 0)
262                 return changed;
263         if (params->rmask) {
264                 int err = snd_pcm_hw_refine(pcm, params);
265                 if (err < 0)
266                         return err;
267         }
268         return snd_pcm_hw_param_value_min(params, var, dir);
269 }
270 
271 static int _snd_pcm_hw_param_max(struct snd_pcm_hw_params *params,
272                                  snd_pcm_hw_param_t var, unsigned int val,
273                                  int dir)
274 {
275         int changed;
276         int open = 0;
277         if (dir) {
278                 if (dir < 0) {
279                         open = 1;
280                 } else if (dir > 0) {
281                         open = 1;
282                         val++;
283                 }
284         }
285         if (hw_is_mask(var)) {
286                 if (val == 0 && open) {
287                         snd_mask_none(hw_param_mask(params, var));
288                         changed = -EINVAL;
289                 } else
290                         changed = snd_mask_refine_max(hw_param_mask(params, var),
291                                                       val - !!open);
292         } else if (hw_is_interval(var))
293                 changed = snd_interval_refine_max(hw_param_interval(params, var),
294                                                   val, open);
295         else
296                 return -EINVAL;
297         if (changed > 0) {
298                 params->cmask |= 1 << var;
299                 params->rmask |= 1 << var;
300         }
301         return changed;
302 }
303 
304 /**
305  * snd_pcm_hw_param_max
306  * @pcm: PCM instance
307  * @params: the hw_params instance
308  * @var: parameter to retrieve
309  * @val: maximal value
310  * @dir: pointer to the direction (-1,0,1) or NULL
311  *
312  * Inside configuration space defined by PARAMS remove from PAR all 
313  *  values >= VAL + 1. Reduce configuration space accordingly.
314  *  Return new maximum or -EINVAL if the configuration space is empty
315  */
316 static int snd_pcm_hw_param_max(struct snd_pcm_substream *pcm,
317                                 struct snd_pcm_hw_params *params,
318                                 snd_pcm_hw_param_t var, unsigned int val,
319                                 int *dir)
320 {
321         int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
322         if (changed < 0)
323                 return changed;
324         if (params->rmask) {
325                 int err = snd_pcm_hw_refine(pcm, params);
326                 if (err < 0)
327                         return err;
328         }
329         return snd_pcm_hw_param_value_max(params, var, dir);
330 }
331 
332 static int boundary_sub(int a, int adir,
333                         int b, int bdir,
334                         int *c, int *cdir)
335 {
336         adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
337         bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
338         *c = a - b;
339         *cdir = adir - bdir;
340         if (*cdir == -2) {
341                 (*c)--;
342         } else if (*cdir == 2) {
343                 (*c)++;
344         }
345         return 0;
346 }
347 
348 static int boundary_lt(unsigned int a, int adir,
349                        unsigned int b, int bdir)
350 {
351         if (adir < 0) {
352                 a--;
353                 adir = 1;
354         } else if (adir > 0)
355                 adir = 1;
356         if (bdir < 0) {
357                 b--;
358                 bdir = 1;
359         } else if (bdir > 0)
360                 bdir = 1;
361         return a < b || (a == b && adir < bdir);
362 }
363 
364 /* Return 1 if min is nearer to best than max */
365 static int boundary_nearer(int min, int mindir,
366                            int best, int bestdir,
367                            int max, int maxdir)
368 {
369         int dmin, dmindir;
370         int dmax, dmaxdir;
371         boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
372         boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
373         return boundary_lt(dmin, dmindir, dmax, dmaxdir);
374 }
375 
376 /**
377  * snd_pcm_hw_param_near
378  * @pcm: PCM instance
379  * @params: the hw_params instance
380  * @var: parameter to retrieve
381  * @best: value to set
382  * @dir: pointer to the direction (-1,0,1) or NULL
383  *
384  * Inside configuration space defined by PARAMS set PAR to the available value
385  * nearest to VAL. Reduce configuration space accordingly.
386  * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
387  * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
388  * Return the value found.
389   */
390 static int snd_pcm_hw_param_near(struct snd_pcm_substream *pcm,
391                                  struct snd_pcm_hw_params *params,
392                                  snd_pcm_hw_param_t var, unsigned int best,
393                                  int *dir)
394 {
395         struct snd_pcm_hw_params *save = NULL;
396         int v;
397         unsigned int saved_min;
398         int last = 0;
399         int min, max;
400         int mindir, maxdir;
401         int valdir = dir ? *dir : 0;
402         /* FIXME */
403         if (best > INT_MAX)
404                 best = INT_MAX;
405         min = max = best;
406         mindir = maxdir = valdir;
407         if (maxdir > 0)
408                 maxdir = 0;
409         else if (maxdir == 0)
410                 maxdir = -1;
411         else {
412                 maxdir = 1;
413                 max--;
414         }
415         save = kmalloc(sizeof(*save), GFP_KERNEL);
416         if (save == NULL)
417                 return -ENOMEM;
418         *save = *params;
419         saved_min = min;
420         min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
421         if (min >= 0) {
422                 struct snd_pcm_hw_params *params1;
423                 if (max < 0)
424                         goto _end;
425                 if ((unsigned int)min == saved_min && mindir == valdir)
426                         goto _end;
427                 params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
428                 if (params1 == NULL) {
429                         kfree(save);
430                         return -ENOMEM;
431                 }
432                 *params1 = *save;
433                 max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
434                 if (max < 0) {
435                         kfree(params1);
436                         goto _end;
437                 }
438                 if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
439                         *params = *params1;
440                         last = 1;
441                 }
442                 kfree(params1);
443         } else {
444                 *params = *save;
445                 max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
446                 if (max < 0) {
447                         kfree(save);
448                         return max;
449                 }
450                 last = 1;
451         }
452  _end:
453         kfree(save);
454         if (last)
455                 v = snd_pcm_hw_param_last(pcm, params, var, dir);
456         else
457                 v = snd_pcm_hw_param_first(pcm, params, var, dir);
458         return v;
459 }
460 
461 static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
462                                  snd_pcm_hw_param_t var, unsigned int val,
463                                  int dir)
464 {
465         int changed;
466         if (hw_is_mask(var)) {
467                 struct snd_mask *m = hw_param_mask(params, var);
468                 if (val == 0 && dir < 0) {
469                         changed = -EINVAL;
470                         snd_mask_none(m);
471                 } else {
472                         if (dir > 0)
473                                 val++;
474                         else if (dir < 0)
475                                 val--;
476                         changed = snd_mask_refine_set(hw_param_mask(params, var), val);
477                 }
478         } else if (hw_is_interval(var)) {
479                 struct snd_interval *i = hw_param_interval(params, var);
480                 if (val == 0 && dir < 0) {
481                         changed = -EINVAL;
482                         snd_interval_none(i);
483                 } else if (dir == 0)
484                         changed = snd_interval_refine_set(i, val);
485                 else {
486                         struct snd_interval t;
487                         t.openmin = 1;
488                         t.openmax = 1;
489                         t.empty = 0;
490                         t.integer = 0;
491                         if (dir < 0) {
492                                 t.min = val - 1;
493                                 t.max = val;
494                         } else {
495                                 t.min = val;
496                                 t.max = val+1;
497                         }
498                         changed = snd_interval_refine(i, &t);
499                 }
500         } else
501                 return -EINVAL;
502         if (changed > 0) {
503                 params->cmask |= 1 << var;
504                 params->rmask |= 1 << var;
505         }
506         return changed;
507 }
508 
509 /**
510  * snd_pcm_hw_param_set
511  * @pcm: PCM instance
512  * @params: the hw_params instance
513  * @var: parameter to retrieve
514  * @val: value to set
515  * @dir: pointer to the direction (-1,0,1) or NULL
516  *
517  * Inside configuration space defined by PARAMS remove from PAR all 
518  * values != VAL. Reduce configuration space accordingly.
519  *  Return VAL or -EINVAL if the configuration space is empty
520  */
521 static int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm,
522                                 struct snd_pcm_hw_params *params,
523                                 snd_pcm_hw_param_t var, unsigned int val,
524                                 int dir)
525 {
526         int changed = _snd_pcm_hw_param_set(params, var, val, dir);
527         if (changed < 0)
528                 return changed;
529         if (params->rmask) {
530                 int err = snd_pcm_hw_refine(pcm, params);
531                 if (err < 0)
532                         return err;
533         }
534         return snd_pcm_hw_param_value(params, var, NULL);
535 }
536 
537 static int _snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params *params,
538                                         snd_pcm_hw_param_t var)
539 {
540         int changed;
541         changed = snd_interval_setinteger(hw_param_interval(params, var));
542         if (changed > 0) {
543                 params->cmask |= 1 << var;
544                 params->rmask |= 1 << var;
545         }
546         return changed;
547 }
548         
549 /*
550  * plugin
551  */
552 
553 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
554 static int snd_pcm_oss_plugin_clear(struct snd_pcm_substream *substream)
555 {
556         struct snd_pcm_runtime *runtime = substream->runtime;
557         struct snd_pcm_plugin *plugin, *next;
558         
559         plugin = runtime->oss.plugin_first;
560         while (plugin) {
561                 next = plugin->next;
562                 snd_pcm_plugin_free(plugin);
563                 plugin = next;
564         }
565         runtime->oss.plugin_first = runtime->oss.plugin_last = NULL;
566         return 0;
567 }
568 
569 static int snd_pcm_plugin_insert(struct snd_pcm_plugin *plugin)
570 {
571         struct snd_pcm_runtime *runtime = plugin->plug->runtime;
572         plugin->next = runtime->oss.plugin_first;
573         plugin->prev = NULL;
574         if (runtime->oss.plugin_first) {
575                 runtime->oss.plugin_first->prev = plugin;
576                 runtime->oss.plugin_first = plugin;
577         } else {
578                 runtime->oss.plugin_last =
579                 runtime->oss.plugin_first = plugin;
580         }
581         return 0;
582 }
583 
584 int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin)
585 {
586         struct snd_pcm_runtime *runtime = plugin->plug->runtime;
587         plugin->next = NULL;
588         plugin->prev = runtime->oss.plugin_last;
589         if (runtime->oss.plugin_last) {
590                 runtime->oss.plugin_last->next = plugin;
591                 runtime->oss.plugin_last = plugin;
592         } else {
593                 runtime->oss.plugin_last =
594                 runtime->oss.plugin_first = plugin;
595         }
596         return 0;
597 }
598 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
599 
600 static long snd_pcm_oss_bytes(struct snd_pcm_substream *substream, long frames)
601 {
602         struct snd_pcm_runtime *runtime = substream->runtime;
603         long buffer_size = snd_pcm_lib_buffer_bytes(substream);
604         long bytes = frames_to_bytes(runtime, frames);
605         if (buffer_size == runtime->oss.buffer_bytes)
606                 return bytes;
607 #if BITS_PER_LONG >= 64
608         return runtime->oss.buffer_bytes * bytes / buffer_size;
609 #else
610         {
611                 u64 bsize = (u64)runtime->oss.buffer_bytes * (u64)bytes;
612                 return div_u64(bsize, buffer_size);
613         }
614 #endif
615 }
616 
617 static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes)
618 {
619         struct snd_pcm_runtime *runtime = substream->runtime;
620         long buffer_size = snd_pcm_lib_buffer_bytes(substream);
621         if (buffer_size == runtime->oss.buffer_bytes)
622                 return bytes_to_frames(runtime, bytes);
623         return bytes_to_frames(runtime, (buffer_size * bytes) / runtime->oss.buffer_bytes);
624 }
625 
626 static inline
627 snd_pcm_uframes_t get_hw_ptr_period(struct snd_pcm_runtime *runtime)
628 {
629         return runtime->hw_ptr_interrupt;
630 }
631 
632 /* define extended formats in the recent OSS versions (if any) */
633 /* linear formats */
634 #define AFMT_S32_LE      0x00001000
635 #define AFMT_S32_BE      0x00002000
636 #define AFMT_S24_LE      0x00008000
637 #define AFMT_S24_BE      0x00010000
638 #define AFMT_S24_PACKED  0x00040000
639 
640 /* other supported formats */
641 #define AFMT_FLOAT       0x00004000
642 #define AFMT_SPDIF_RAW   0x00020000
643 
644 /* unsupported formats */
645 #define AFMT_AC3         0x00000400
646 #define AFMT_VORBIS      0x00000800
647 
648 static snd_pcm_format_t snd_pcm_oss_format_from(int format)
649 {
650         switch (format) {
651         case AFMT_MU_LAW:       return SNDRV_PCM_FORMAT_MU_LAW;
652         case AFMT_A_LAW:        return SNDRV_PCM_FORMAT_A_LAW;
653         case AFMT_IMA_ADPCM:    return SNDRV_PCM_FORMAT_IMA_ADPCM;
654         case AFMT_U8:           return SNDRV_PCM_FORMAT_U8;
655         case AFMT_S16_LE:       return SNDRV_PCM_FORMAT_S16_LE;
656         case AFMT_S16_BE:       return SNDRV_PCM_FORMAT_S16_BE;
657         case AFMT_S8:           return SNDRV_PCM_FORMAT_S8;
658         case AFMT_U16_LE:       return SNDRV_PCM_FORMAT_U16_LE;
659         case AFMT_U16_BE:       return SNDRV_PCM_FORMAT_U16_BE;
660         case AFMT_MPEG:         return SNDRV_PCM_FORMAT_MPEG;
661         case AFMT_S32_LE:       return SNDRV_PCM_FORMAT_S32_LE;
662         case AFMT_S32_BE:       return SNDRV_PCM_FORMAT_S32_BE;
663         case AFMT_S24_LE:       return SNDRV_PCM_FORMAT_S24_LE;
664         case AFMT_S24_BE:       return SNDRV_PCM_FORMAT_S24_BE;
665         case AFMT_S24_PACKED:   return SNDRV_PCM_FORMAT_S24_3LE;
666         case AFMT_FLOAT:        return SNDRV_PCM_FORMAT_FLOAT;
667         case AFMT_SPDIF_RAW:    return SNDRV_PCM_FORMAT_IEC958_SUBFRAME;
668         default:                return SNDRV_PCM_FORMAT_U8;
669         }
670 }
671 
672 static int snd_pcm_oss_format_to(snd_pcm_format_t format)
673 {
674         switch (format) {
675         case SNDRV_PCM_FORMAT_MU_LAW:   return AFMT_MU_LAW;
676         case SNDRV_PCM_FORMAT_A_LAW:    return AFMT_A_LAW;
677         case SNDRV_PCM_FORMAT_IMA_ADPCM:        return AFMT_IMA_ADPCM;
678         case SNDRV_PCM_FORMAT_U8:               return AFMT_U8;
679         case SNDRV_PCM_FORMAT_S16_LE:   return AFMT_S16_LE;
680         case SNDRV_PCM_FORMAT_S16_BE:   return AFMT_S16_BE;
681         case SNDRV_PCM_FORMAT_S8:               return AFMT_S8;
682         case SNDRV_PCM_FORMAT_U16_LE:   return AFMT_U16_LE;
683         case SNDRV_PCM_FORMAT_U16_BE:   return AFMT_U16_BE;
684         case SNDRV_PCM_FORMAT_MPEG:             return AFMT_MPEG;
685         case SNDRV_PCM_FORMAT_S32_LE:   return AFMT_S32_LE;
686         case SNDRV_PCM_FORMAT_S32_BE:   return AFMT_S32_BE;
687         case SNDRV_PCM_FORMAT_S24_LE:   return AFMT_S24_LE;
688         case SNDRV_PCM_FORMAT_S24_BE:   return AFMT_S24_BE;
689         case SNDRV_PCM_FORMAT_S24_3LE:  return AFMT_S24_PACKED;
690         case SNDRV_PCM_FORMAT_FLOAT:    return AFMT_FLOAT;
691         case SNDRV_PCM_FORMAT_IEC958_SUBFRAME: return AFMT_SPDIF_RAW;
692         default:                        return -EINVAL;
693         }
694 }
695 
696 static int snd_pcm_oss_period_size(struct snd_pcm_substream *substream, 
697                                    struct snd_pcm_hw_params *oss_params,
698                                    struct snd_pcm_hw_params *slave_params)
699 {
700         size_t s;
701         size_t oss_buffer_size, oss_period_size, oss_periods;
702         size_t min_period_size, max_period_size;
703         struct snd_pcm_runtime *runtime = substream->runtime;
704         size_t oss_frame_size;
705 
706         oss_frame_size = snd_pcm_format_physical_width(params_format(oss_params)) *
707                          params_channels(oss_params) / 8;
708 
709         oss_buffer_size = snd_pcm_plug_client_size(substream,
710                                                    snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, NULL)) * oss_frame_size;
711         oss_buffer_size = rounddown_pow_of_two(oss_buffer_size);
712         if (atomic_read(&substream->mmap_count)) {
713                 if (oss_buffer_size > runtime->oss.mmap_bytes)
714                         oss_buffer_size = runtime->oss.mmap_bytes;
715         }
716 
717         if (substream->oss.setup.period_size > 16)
718                 oss_period_size = substream->oss.setup.period_size;
719         else if (runtime->oss.fragshift) {
720                 oss_period_size = 1 << runtime->oss.fragshift;
721                 if (oss_period_size > oss_buffer_size / 2)
722                         oss_period_size = oss_buffer_size / 2;
723         } else {
724                 int sd;
725                 size_t bytes_per_sec = params_rate(oss_params) * snd_pcm_format_physical_width(params_format(oss_params)) * params_channels(oss_params) / 8;
726 
727                 oss_period_size = oss_buffer_size;
728                 do {
729                         oss_period_size /= 2;
730                 } while (oss_period_size > bytes_per_sec);
731                 if (runtime->oss.subdivision == 0) {
732                         sd = 4;
733                         if (oss_period_size / sd > 4096)
734                                 sd *= 2;
735                         if (oss_period_size / sd < 4096)
736                                 sd = 1;
737                 } else
738                         sd = runtime->oss.subdivision;
739                 oss_period_size /= sd;
740                 if (oss_period_size < 16)
741                         oss_period_size = 16;
742         }
743 
744         min_period_size = snd_pcm_plug_client_size(substream,
745                                                    snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
746         min_period_size *= oss_frame_size;
747         min_period_size = roundup_pow_of_two(min_period_size);
748         if (oss_period_size < min_period_size)
749                 oss_period_size = min_period_size;
750 
751         max_period_size = snd_pcm_plug_client_size(substream,
752                                                    snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
753         max_period_size *= oss_frame_size;
754         max_period_size = rounddown_pow_of_two(max_period_size);
755         if (oss_period_size > max_period_size)
756                 oss_period_size = max_period_size;
757 
758         oss_periods = oss_buffer_size / oss_period_size;
759 
760         if (substream->oss.setup.periods > 1)
761                 oss_periods = substream->oss.setup.periods;
762 
763         s = snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
764         if (runtime->oss.maxfrags && s > runtime->oss.maxfrags)
765                 s = runtime->oss.maxfrags;
766         if (oss_periods > s)
767                 oss_periods = s;
768 
769         s = snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
770         if (s < 2)
771                 s = 2;
772         if (oss_periods < s)
773                 oss_periods = s;
774 
775         while (oss_period_size * oss_periods > oss_buffer_size)
776                 oss_period_size /= 2;
777 
778         if (oss_period_size < 16)
779                 return -EINVAL;
780         runtime->oss.period_bytes = oss_period_size;
781         runtime->oss.period_frames = 1;
782         runtime->oss.periods = oss_periods;
783         return 0;
784 }
785 
786 static int choose_rate(struct snd_pcm_substream *substream,
787                        struct snd_pcm_hw_params *params, unsigned int best_rate)
788 {
789         const struct snd_interval *it;
790         struct snd_pcm_hw_params *save;
791         unsigned int rate, prev;
792 
793         save = kmalloc(sizeof(*save), GFP_KERNEL);
794         if (save == NULL)
795                 return -ENOMEM;
796         *save = *params;
797         it = hw_param_interval_c(save, SNDRV_PCM_HW_PARAM_RATE);
798 
799         /* try multiples of the best rate */
800         rate = best_rate;
801         for (;;) {
802                 if (it->max < rate || (it->max == rate && it->openmax))
803                         break;
804                 if (it->min < rate || (it->min == rate && !it->openmin)) {
805                         int ret;
806                         ret = snd_pcm_hw_param_set(substream, params,
807                                                    SNDRV_PCM_HW_PARAM_RATE,
808                                                    rate, 0);
809                         if (ret == (int)rate) {
810                                 kfree(save);
811                                 return rate;
812                         }
813                         *params = *save;
814                 }
815                 prev = rate;
816                 rate += best_rate;
817                 if (rate <= prev)
818                         break;
819         }
820 
821         /* not found, use the nearest rate */
822         kfree(save);
823         return snd_pcm_hw_param_near(substream, params, SNDRV_PCM_HW_PARAM_RATE, best_rate, NULL);
824 }
825 
826 /* parameter locking: returns immediately if tried during streaming */
827 static int lock_params(struct snd_pcm_runtime *runtime)
828 {
829         if (mutex_lock_interruptible(&runtime->oss.params_lock))
830                 return -ERESTARTSYS;
831         if (atomic_read(&runtime->oss.rw_ref)) {
832                 mutex_unlock(&runtime->oss.params_lock);
833                 return -EBUSY;
834         }
835         return 0;
836 }
837 
838 static void unlock_params(struct snd_pcm_runtime *runtime)
839 {
840         mutex_unlock(&runtime->oss.params_lock);
841 }
842 
843 /* call with params_lock held */
844 static int snd_pcm_oss_change_params_locked(struct snd_pcm_substream *substream)
845 {
846         struct snd_pcm_runtime *runtime = substream->runtime;
847         struct snd_pcm_hw_params *params, *sparams;
848         struct snd_pcm_sw_params *sw_params;
849         ssize_t oss_buffer_size, oss_period_size;
850         size_t oss_frame_size;
851         int err;
852         int direct;
853         snd_pcm_format_t format, sformat;
854         int n;
855         const struct snd_mask *sformat_mask;
856         struct snd_mask mask;
857 
858         if (!runtime->oss.params)
859                 return 0;
860         sw_params = kzalloc(sizeof(*sw_params), GFP_KERNEL);
861         params = kmalloc(sizeof(*params), GFP_KERNEL);
862         sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
863         if (!sw_params || !params || !sparams) {
864                 err = -ENOMEM;
865                 goto failure;
866         }
867 
868         if (atomic_read(&substream->mmap_count))
869                 direct = 1;
870         else
871                 direct = substream->oss.setup.direct;
872 
873         _snd_pcm_hw_params_any(sparams);
874         _snd_pcm_hw_param_setinteger(sparams, SNDRV_PCM_HW_PARAM_PERIODS);
875         _snd_pcm_hw_param_min(sparams, SNDRV_PCM_HW_PARAM_PERIODS, 2, 0);
876         snd_mask_none(&mask);
877         if (atomic_read(&substream->mmap_count))
878                 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
879         else {
880                 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED);
881                 if (!direct)
882                         snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
883         }
884         err = snd_pcm_hw_param_mask(substream, sparams, SNDRV_PCM_HW_PARAM_ACCESS, &mask);
885         if (err < 0) {
886                 pcm_dbg(substream->pcm, "No usable accesses\n");
887                 err = -EINVAL;
888                 goto failure;
889         }
890         choose_rate(substream, sparams, runtime->oss.rate);
891         snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_CHANNELS, runtime->oss.channels, NULL);
892 
893         format = snd_pcm_oss_format_from(runtime->oss.format);
894 
895         sformat_mask = hw_param_mask_c(sparams, SNDRV_PCM_HW_PARAM_FORMAT);
896         if (direct)
897                 sformat = format;
898         else
899                 sformat = snd_pcm_plug_slave_format(format, sformat_mask);
900 
901         if ((__force int)sformat < 0 ||
902             !snd_mask_test(sformat_mask, (__force int)sformat)) {
903                 for (sformat = (__force snd_pcm_format_t)0;
904                      (__force int)sformat <= (__force int)SNDRV_PCM_FORMAT_LAST;
905                      sformat = (__force snd_pcm_format_t)((__force int)sformat + 1)) {
906                         if (snd_mask_test(sformat_mask, (__force int)sformat) &&
907                             snd_pcm_oss_format_to(sformat) >= 0)
908                                 break;
909                 }
910                 if ((__force int)sformat > (__force int)SNDRV_PCM_FORMAT_LAST) {
911                         pcm_dbg(substream->pcm, "Cannot find a format!!!\n");
912                         err = -EINVAL;
913                         goto failure;
914                 }
915         }
916         err = _snd_pcm_hw_param_set(sparams, SNDRV_PCM_HW_PARAM_FORMAT, (__force int)sformat, 0);
917         if (err < 0)
918                 goto failure;
919 
920         if (direct) {
921                 memcpy(params, sparams, sizeof(*params));
922         } else {
923                 _snd_pcm_hw_params_any(params);
924                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
925                                       (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED, 0);
926                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
927                                       (__force int)snd_pcm_oss_format_from(runtime->oss.format), 0);
928                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
929                                       runtime->oss.channels, 0);
930                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
931                                       runtime->oss.rate, 0);
932                 pdprintf("client: access = %i, format = %i, channels = %i, rate = %i\n",
933                          params_access(params), params_format(params),
934                          params_channels(params), params_rate(params));
935         }
936         pdprintf("slave: access = %i, format = %i, channels = %i, rate = %i\n",
937                  params_access(sparams), params_format(sparams),
938                  params_channels(sparams), params_rate(sparams));
939 
940         oss_frame_size = snd_pcm_format_physical_width(params_format(params)) *
941                          params_channels(params) / 8;
942 
943 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
944         snd_pcm_oss_plugin_clear(substream);
945         if (!direct) {
946                 /* add necessary plugins */
947                 snd_pcm_oss_plugin_clear(substream);
948                 if ((err = snd_pcm_plug_format_plugins(substream,
949                                                        params, 
950                                                        sparams)) < 0) {
951                         pcm_dbg(substream->pcm,
952                                 "snd_pcm_plug_format_plugins failed: %i\n", err);
953                         snd_pcm_oss_plugin_clear(substream);
954                         goto failure;
955                 }
956                 if (runtime->oss.plugin_first) {
957                         struct snd_pcm_plugin *plugin;
958                         if ((err = snd_pcm_plugin_build_io(substream, sparams, &plugin)) < 0) {
959                                 pcm_dbg(substream->pcm,
960                                         "snd_pcm_plugin_build_io failed: %i\n", err);
961                                 snd_pcm_oss_plugin_clear(substream);
962                                 goto failure;
963                         }
964                         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
965                                 err = snd_pcm_plugin_append(plugin);
966                         } else {
967                                 err = snd_pcm_plugin_insert(plugin);
968                         }
969                         if (err < 0) {
970                                 snd_pcm_oss_plugin_clear(substream);
971                                 goto failure;
972                         }
973                 }
974         }
975 #endif
976 
977         err = snd_pcm_oss_period_size(substream, params, sparams);
978         if (err < 0)
979                 goto failure;
980 
981         n = snd_pcm_plug_slave_size(substream, runtime->oss.period_bytes / oss_frame_size);
982         err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, n, NULL);
983         if (err < 0)
984                 goto failure;
985 
986         err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIODS,
987                                      runtime->oss.periods, NULL);
988         if (err < 0)
989                 goto failure;
990 
991         snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
992 
993         if ((err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, sparams)) < 0) {
994                 pcm_dbg(substream->pcm, "HW_PARAMS failed: %i\n", err);
995                 goto failure;
996         }
997 
998         if (runtime->oss.trigger) {
999                 sw_params->start_threshold = 1;
1000         } else {
1001                 sw_params->start_threshold = runtime->boundary;
1002         }
1003         if (atomic_read(&substream->mmap_count) ||
1004             substream->stream == SNDRV_PCM_STREAM_CAPTURE)
1005                 sw_params->stop_threshold = runtime->boundary;
1006         else
1007                 sw_params->stop_threshold = runtime->buffer_size;
1008         sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
1009         sw_params->period_step = 1;
1010         sw_params->avail_min = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
1011                 1 : runtime->period_size;
1012         if (atomic_read(&substream->mmap_count) ||
1013             substream->oss.setup.nosilence) {
1014                 sw_params->silence_threshold = 0;
1015                 sw_params->silence_size = 0;
1016         } else {
1017                 snd_pcm_uframes_t frames;
1018                 frames = runtime->period_size + 16;
1019                 if (frames > runtime->buffer_size)
1020                         frames = runtime->buffer_size;
1021                 sw_params->silence_threshold = frames;
1022                 sw_params->silence_size = frames;
1023         }
1024 
1025         if ((err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_SW_PARAMS, sw_params)) < 0) {
1026                 pcm_dbg(substream->pcm, "SW_PARAMS failed: %i\n", err);
1027                 goto failure;
1028         }
1029 
1030         runtime->oss.periods = params_periods(sparams);
1031         oss_period_size = snd_pcm_plug_client_size(substream, params_period_size(sparams));
1032         if (oss_period_size < 0) {
1033                 err = -EINVAL;
1034                 goto failure;
1035         }
1036 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1037         if (runtime->oss.plugin_first) {
1038                 err = snd_pcm_plug_alloc(substream, oss_period_size);
1039                 if (err < 0)
1040                         goto failure;
1041         }
1042 #endif
1043         oss_period_size *= oss_frame_size;
1044 
1045         oss_buffer_size = oss_period_size * runtime->oss.periods;
1046         if (oss_buffer_size < 0) {
1047                 err = -EINVAL;
1048                 goto failure;
1049         }
1050 
1051         runtime->oss.period_bytes = oss_period_size;
1052         runtime->oss.buffer_bytes = oss_buffer_size;
1053 
1054         pdprintf("oss: period bytes = %i, buffer bytes = %i\n",
1055                  runtime->oss.period_bytes,
1056                  runtime->oss.buffer_bytes);
1057         pdprintf("slave: period_size = %i, buffer_size = %i\n",
1058                  params_period_size(sparams),
1059                  params_buffer_size(sparams));
1060 
1061         runtime->oss.format = snd_pcm_oss_format_to(params_format(params));
1062         runtime->oss.channels = params_channels(params);
1063         runtime->oss.rate = params_rate(params);
1064 
1065         vfree(runtime->oss.buffer);
1066         runtime->oss.buffer = vmalloc(runtime->oss.period_bytes);
1067         if (!runtime->oss.buffer) {
1068                 err = -ENOMEM;
1069                 goto failure;
1070         }
1071 
1072         runtime->oss.params = 0;
1073         runtime->oss.prepare = 1;
1074         runtime->oss.buffer_used = 0;
1075         if (runtime->dma_area)
1076                 snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes));
1077 
1078         runtime->oss.period_frames = snd_pcm_alsa_frames(substream, oss_period_size);
1079 
1080         err = 0;
1081 failure:
1082         kfree(sw_params);
1083         kfree(params);
1084         kfree(sparams);
1085         return err;
1086 }
1087 
1088 /* this one takes the lock by itself */
1089 static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
1090                                      bool trylock)
1091 {
1092         struct snd_pcm_runtime *runtime = substream->runtime;
1093         int err;
1094 
1095         if (trylock) {
1096                 if (!(mutex_trylock(&runtime->oss.params_lock)))
1097                         return -EAGAIN;
1098         } else if (mutex_lock_interruptible(&runtime->oss.params_lock))
1099                 return -ERESTARTSYS;
1100 
1101         err = snd_pcm_oss_change_params_locked(substream);
1102         mutex_unlock(&runtime->oss.params_lock);
1103         return err;
1104 }
1105 
1106 static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream)
1107 {
1108         int idx, err;
1109         struct snd_pcm_substream *asubstream = NULL, *substream;
1110 
1111         for (idx = 0; idx < 2; idx++) {
1112                 substream = pcm_oss_file->streams[idx];
1113                 if (substream == NULL)
1114                         continue;
1115                 if (asubstream == NULL)
1116                         asubstream = substream;
1117                 if (substream->runtime->oss.params) {
1118                         err = snd_pcm_oss_change_params(substream, false);
1119                         if (err < 0)
1120                                 return err;
1121                 }
1122         }
1123         if (!asubstream)
1124                 return -EIO;
1125         if (r_substream)
1126                 *r_substream = asubstream;
1127         return 0;
1128 }
1129 
1130 /* call with params_lock held */
1131 /* NOTE: this always call PREPARE unconditionally no matter whether
1132  * runtime->oss.prepare is set or not
1133  */
1134 static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
1135 {
1136         int err;
1137         struct snd_pcm_runtime *runtime = substream->runtime;
1138 
1139         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
1140         if (err < 0) {
1141                 pcm_dbg(substream->pcm,
1142                         "snd_pcm_oss_prepare: SNDRV_PCM_IOCTL_PREPARE failed\n");
1143                 return err;
1144         }
1145         runtime->oss.prepare = 0;
1146         runtime->oss.prev_hw_ptr_period = 0;
1147         runtime->oss.period_ptr = 0;
1148         runtime->oss.buffer_used = 0;
1149 
1150         return 0;
1151 }
1152 
1153 static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream)
1154 {
1155         struct snd_pcm_runtime *runtime;
1156         int err;
1157 
1158         runtime = substream->runtime;
1159         if (runtime->oss.params) {
1160                 err = snd_pcm_oss_change_params(substream, false);
1161                 if (err < 0)
1162                         return err;
1163         }
1164         if (runtime->oss.prepare) {
1165                 if (mutex_lock_interruptible(&runtime->oss.params_lock))
1166                         return -ERESTARTSYS;
1167                 err = snd_pcm_oss_prepare(substream);
1168                 mutex_unlock(&runtime->oss.params_lock);
1169                 if (err < 0)
1170                         return err;
1171         }
1172         return 0;
1173 }
1174 
1175 /* call with params_lock held */
1176 static int snd_pcm_oss_make_ready_locked(struct snd_pcm_substream *substream)
1177 {
1178         struct snd_pcm_runtime *runtime;
1179         int err;
1180 
1181         runtime = substream->runtime;
1182         if (runtime->oss.params) {
1183                 err = snd_pcm_oss_change_params_locked(substream);
1184                 if (err < 0)
1185                         return err;
1186         }
1187         if (runtime->oss.prepare) {
1188                 err = snd_pcm_oss_prepare(substream);
1189                 if (err < 0)
1190                         return err;
1191         }
1192         return 0;
1193 }
1194 
1195 static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay)
1196 {
1197         struct snd_pcm_runtime *runtime;
1198         snd_pcm_uframes_t frames;
1199         int err = 0;
1200 
1201         while (1) {
1202                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, delay);
1203                 if (err < 0)
1204                         break;
1205                 runtime = substream->runtime;
1206                 if (*delay <= (snd_pcm_sframes_t)runtime->buffer_size)
1207                         break;
1208                 /* in case of overrun, skip whole periods like OSS/Linux driver does */
1209                 /* until avail(delay) <= buffer_size */
1210                 frames = (*delay - runtime->buffer_size) + runtime->period_size - 1;
1211                 frames /= runtime->period_size;
1212                 frames *= runtime->period_size;
1213                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_FORWARD, &frames);
1214                 if (err < 0)
1215                         break;
1216         }
1217         return err;
1218 }
1219 
1220 snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1221 {
1222         struct snd_pcm_runtime *runtime = substream->runtime;
1223         int ret;
1224         while (1) {
1225                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1226                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1227 #ifdef OSS_DEBUG
1228                         pcm_dbg(substream->pcm,
1229                                 "pcm_oss: write: recovering from %s\n",
1230                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1231                                 "XRUN" : "SUSPEND");
1232 #endif
1233                         ret = snd_pcm_oss_prepare(substream);
1234                         if (ret < 0)
1235                                 break;
1236                 }
1237                 ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1238                                          frames, in_kernel);
1239                 if (ret != -EPIPE && ret != -ESTRPIPE)
1240                         break;
1241                 /* test, if we can't store new data, because the stream */
1242                 /* has not been started */
1243                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1244                         return -EAGAIN;
1245         }
1246         return ret;
1247 }
1248 
1249 snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1250 {
1251         struct snd_pcm_runtime *runtime = substream->runtime;
1252         snd_pcm_sframes_t delay;
1253         int ret;
1254         while (1) {
1255                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1256                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1257 #ifdef OSS_DEBUG
1258                         pcm_dbg(substream->pcm,
1259                                 "pcm_oss: read: recovering from %s\n",
1260                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1261                                 "XRUN" : "SUSPEND");
1262 #endif
1263                         ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1264                         if (ret < 0)
1265                                 break;
1266                 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1267                         ret = snd_pcm_oss_prepare(substream);
1268                         if (ret < 0)
1269                                 break;
1270                 }
1271                 ret = snd_pcm_oss_capture_position_fixup(substream, &delay);
1272                 if (ret < 0)
1273                         break;
1274                 ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1275                                          frames, in_kernel);
1276                 if (ret == -EPIPE) {
1277                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1278                                 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1279                                 if (ret < 0)
1280                                         break;
1281                         }
1282                         continue;
1283                 }
1284                 if (ret != -ESTRPIPE)
1285                         break;
1286         }
1287         return ret;
1288 }
1289 
1290 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1291 snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1292 {
1293         struct snd_pcm_runtime *runtime = substream->runtime;
1294         int ret;
1295         while (1) {
1296                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1297                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1298 #ifdef OSS_DEBUG
1299                         pcm_dbg(substream->pcm,
1300                                 "pcm_oss: writev: recovering from %s\n",
1301                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1302                                 "XRUN" : "SUSPEND");
1303 #endif
1304                         ret = snd_pcm_oss_prepare(substream);
1305                         if (ret < 0)
1306                                 break;
1307                 }
1308                 ret = snd_pcm_kernel_writev(substream, bufs, frames);
1309                 if (ret != -EPIPE && ret != -ESTRPIPE)
1310                         break;
1311 
1312                 /* test, if we can't store new data, because the stream */
1313                 /* has not been started */
1314                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1315                         return -EAGAIN;
1316         }
1317         return ret;
1318 }
1319         
1320 snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1321 {
1322         struct snd_pcm_runtime *runtime = substream->runtime;
1323         int ret;
1324         while (1) {
1325                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1326                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1327 #ifdef OSS_DEBUG
1328                         pcm_dbg(substream->pcm,
1329                                 "pcm_oss: readv: recovering from %s\n",
1330                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1331                                 "XRUN" : "SUSPEND");
1332 #endif
1333                         ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1334                         if (ret < 0)
1335                                 break;
1336                 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1337                         ret = snd_pcm_oss_prepare(substream);
1338                         if (ret < 0)
1339                                 break;
1340                 }
1341                 ret = snd_pcm_kernel_readv(substream, bufs, frames);
1342                 if (ret != -EPIPE && ret != -ESTRPIPE)
1343                         break;
1344         }
1345         return ret;
1346 }
1347 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
1348 
1349 static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel)
1350 {
1351         struct snd_pcm_runtime *runtime = substream->runtime;
1352         snd_pcm_sframes_t frames, frames1;
1353 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1354         if (runtime->oss.plugin_first) {
1355                 struct snd_pcm_plugin_channel *channels;
1356                 size_t oss_frame_bytes = (runtime->oss.plugin_first->src_width * runtime->oss.plugin_first->src_format.channels) / 8;
1357                 if (!in_kernel) {
1358                         if (copy_from_user(runtime->oss.buffer, (const char __force __user *)buf, bytes))
1359                                 return -EFAULT;
1360                         buf = runtime->oss.buffer;
1361                 }
1362                 frames = bytes / oss_frame_bytes;
1363                 frames1 = snd_pcm_plug_client_channels_buf(substream, (char *)buf, frames, &channels);
1364                 if (frames1 < 0)
1365                         return frames1;
1366                 frames1 = snd_pcm_plug_write_transfer(substream, channels, frames1);
1367                 if (frames1 <= 0)
1368                         return frames1;
1369                 bytes = frames1 * oss_frame_bytes;
1370         } else
1371 #endif
1372         {
1373                 frames = bytes_to_frames(runtime, bytes);
1374                 frames1 = snd_pcm_oss_write3(substream, buf, frames, in_kernel);
1375                 if (frames1 <= 0)
1376                         return frames1;
1377                 bytes = frames_to_bytes(runtime, frames1);
1378         }
1379         return bytes;
1380 }
1381 
1382 static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes)
1383 {
1384         size_t xfer = 0;
1385         ssize_t tmp = 0;
1386         struct snd_pcm_runtime *runtime = substream->runtime;
1387 
1388         if (atomic_read(&substream->mmap_count))
1389                 return -ENXIO;
1390 
1391         atomic_inc(&runtime->oss.rw_ref);
1392         while (bytes > 0) {
1393                 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1394                         tmp = -ERESTARTSYS;
1395                         break;
1396                 }
1397                 tmp = snd_pcm_oss_make_ready_locked(substream);
1398                 if (tmp < 0)
1399                         goto err;
1400                 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1401                         tmp = bytes;
1402                         if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
1403                                 tmp = runtime->oss.period_bytes - runtime->oss.buffer_used;
1404                         if (tmp > 0) {
1405                                 if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp)) {
1406                                         tmp = -EFAULT;
1407                                         goto err;
1408                                 }
1409                         }
1410                         runtime->oss.buffer_used += tmp;
1411                         buf += tmp;
1412                         bytes -= tmp;
1413                         xfer += tmp;
1414                         if (substream->oss.setup.partialfrag ||
1415                             runtime->oss.buffer_used == runtime->oss.period_bytes) {
1416                                 tmp = snd_pcm_oss_write2(substream, runtime->oss.buffer + runtime->oss.period_ptr, 
1417                                                          runtime->oss.buffer_used - runtime->oss.period_ptr, 1);
1418                                 if (tmp <= 0)
1419                                         goto err;
1420                                 runtime->oss.bytes += tmp;
1421                                 runtime->oss.period_ptr += tmp;
1422                                 runtime->oss.period_ptr %= runtime->oss.period_bytes;
1423                                 if (runtime->oss.period_ptr == 0 ||
1424                                     runtime->oss.period_ptr == runtime->oss.buffer_used)
1425                                         runtime->oss.buffer_used = 0;
1426                                 else if ((substream->f_flags & O_NONBLOCK) != 0) {
1427                                         tmp = -EAGAIN;
1428                                         goto err;
1429                                 }
1430                         }
1431                 } else {
1432                         tmp = snd_pcm_oss_write2(substream,
1433                                                  (const char __force *)buf,
1434                                                  runtime->oss.period_bytes, 0);
1435                         if (tmp <= 0)
1436                                 goto err;
1437                         runtime->oss.bytes += tmp;
1438                         buf += tmp;
1439                         bytes -= tmp;
1440                         xfer += tmp;
1441                         if ((substream->f_flags & O_NONBLOCK) != 0 &&
1442                             tmp != runtime->oss.period_bytes)
1443                                 tmp = -EAGAIN;
1444                 }
1445  err:
1446                 mutex_unlock(&runtime->oss.params_lock);
1447                 if (tmp < 0)
1448                         break;
1449                 if (signal_pending(current)) {
1450                         tmp = -ERESTARTSYS;
1451                         break;
1452                 }
1453                 tmp = 0;
1454         }
1455         atomic_dec(&runtime->oss.rw_ref);
1456         return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1457 }
1458 
1459 static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel)
1460 {
1461         struct snd_pcm_runtime *runtime = substream->runtime;
1462         snd_pcm_sframes_t frames, frames1;
1463 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1464         char __user *final_dst = (char __force __user *)buf;
1465         if (runtime->oss.plugin_first) {
1466                 struct snd_pcm_plugin_channel *channels;
1467                 size_t oss_frame_bytes = (runtime->oss.plugin_last->dst_width * runtime->oss.plugin_last->dst_format.channels) / 8;
1468                 if (!in_kernel)
1469                         buf = runtime->oss.buffer;
1470                 frames = bytes / oss_frame_bytes;
1471                 frames1 = snd_pcm_plug_client_channels_buf(substream, buf, frames, &channels);
1472                 if (frames1 < 0)
1473                         return frames1;
1474                 frames1 = snd_pcm_plug_read_transfer(substream, channels, frames1);
1475                 if (frames1 <= 0)
1476                         return frames1;
1477                 bytes = frames1 * oss_frame_bytes;
1478                 if (!in_kernel && copy_to_user(final_dst, buf, bytes))
1479                         return -EFAULT;
1480         } else
1481 #endif
1482         {
1483                 frames = bytes_to_frames(runtime, bytes);
1484                 frames1 = snd_pcm_oss_read3(substream, buf, frames, in_kernel);
1485                 if (frames1 <= 0)
1486                         return frames1;
1487                 bytes = frames_to_bytes(runtime, frames1);
1488         }
1489         return bytes;
1490 }
1491 
1492 static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes)
1493 {
1494         size_t xfer = 0;
1495         ssize_t tmp = 0;
1496         struct snd_pcm_runtime *runtime = substream->runtime;
1497 
1498         if (atomic_read(&substream->mmap_count))
1499                 return -ENXIO;
1500 
1501         atomic_inc(&runtime->oss.rw_ref);
1502         while (bytes > 0) {
1503                 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1504                         tmp = -ERESTARTSYS;
1505                         break;
1506                 }
1507                 tmp = snd_pcm_oss_make_ready_locked(substream);
1508                 if (tmp < 0)
1509                         goto err;
1510                 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1511                         if (runtime->oss.buffer_used == 0) {
1512                                 tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1);
1513                                 if (tmp <= 0)
1514                                         goto err;
1515                                 runtime->oss.bytes += tmp;
1516                                 runtime->oss.period_ptr = tmp;
1517                                 runtime->oss.buffer_used = tmp;
1518                         }
1519                         tmp = bytes;
1520                         if ((size_t) tmp > runtime->oss.buffer_used)
1521                                 tmp = runtime->oss.buffer_used;
1522                         if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp)) {
1523                                 tmp = -EFAULT;
1524                                 goto err;
1525                         }
1526                         buf += tmp;
1527                         bytes -= tmp;
1528                         xfer += tmp;
1529                         runtime->oss.buffer_used -= tmp;
1530                 } else {
1531                         tmp = snd_pcm_oss_read2(substream, (char __force *)buf,
1532                                                 runtime->oss.period_bytes, 0);
1533                         if (tmp <= 0)
1534                                 goto err;
1535                         runtime->oss.bytes += tmp;
1536                         buf += tmp;
1537                         bytes -= tmp;
1538                         xfer += tmp;
1539                 }
1540  err:
1541                 mutex_unlock(&runtime->oss.params_lock);
1542                 if (tmp < 0)
1543                         break;
1544                 if (signal_pending(current)) {
1545                         tmp = -ERESTARTSYS;
1546                         break;
1547                 }
1548                 tmp = 0;
1549         }
1550         atomic_dec(&runtime->oss.rw_ref);
1551         return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1552 }
1553 
1554 static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
1555 {
1556         struct snd_pcm_substream *substream;
1557         struct snd_pcm_runtime *runtime;
1558         int i;
1559 
1560         for (i = 0; i < 2; i++) { 
1561                 substream = pcm_oss_file->streams[i];
1562                 if (!substream)
1563                         continue;
1564                 runtime = substream->runtime;
1565                 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1566                 mutex_lock(&runtime->oss.params_lock);
1567                 runtime->oss.prepare = 1;
1568                 runtime->oss.buffer_used = 0;
1569                 runtime->oss.prev_hw_ptr_period = 0;
1570                 runtime->oss.period_ptr = 0;
1571                 mutex_unlock(&runtime->oss.params_lock);
1572         }
1573         return 0;
1574 }
1575 
1576 static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file)
1577 {
1578         struct snd_pcm_substream *substream;
1579         int err;
1580 
1581         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1582         if (substream != NULL) {
1583                 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1584                         return err;
1585                 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL);
1586         }
1587         /* note: all errors from the start action are ignored */
1588         /* OSS apps do not know, how to handle them */
1589         return 0;
1590 }
1591 
1592 static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size)
1593 {
1594         struct snd_pcm_runtime *runtime;
1595         ssize_t result = 0;
1596         snd_pcm_state_t state;
1597         long res;
1598         wait_queue_entry_t wait;
1599 
1600         runtime = substream->runtime;
1601         init_waitqueue_entry(&wait, current);
1602         add_wait_queue(&runtime->sleep, &wait);
1603 #ifdef OSS_DEBUG
1604         pcm_dbg(substream->pcm, "sync1: size = %li\n", size);
1605 #endif
1606         while (1) {
1607                 result = snd_pcm_oss_write2(substream, runtime->oss.buffer, size, 1);
1608                 if (result > 0) {
1609                         runtime->oss.buffer_used = 0;
1610                         result = 0;
1611                         break;
1612                 }
1613                 if (result != 0 && result != -EAGAIN)
1614                         break;
1615                 result = 0;
1616                 set_current_state(TASK_INTERRUPTIBLE);
1617                 snd_pcm_stream_lock_irq(substream);
1618                 state = runtime->status->state;
1619                 snd_pcm_stream_unlock_irq(substream);
1620                 if (state != SNDRV_PCM_STATE_RUNNING) {
1621                         set_current_state(TASK_RUNNING);
1622                         break;
1623                 }
1624                 res = schedule_timeout(10 * HZ);
1625                 if (signal_pending(current)) {
1626                         result = -ERESTARTSYS;
1627                         break;
1628                 }
1629                 if (res == 0) {
1630                         pcm_err(substream->pcm,
1631                                 "OSS sync error - DMA timeout\n");
1632                         result = -EIO;
1633                         break;
1634                 }
1635         }
1636         remove_wait_queue(&runtime->sleep, &wait);
1637         return result;
1638 }
1639 
1640 static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
1641 {
1642         int err = 0;
1643         unsigned int saved_f_flags;
1644         struct snd_pcm_substream *substream;
1645         struct snd_pcm_runtime *runtime;
1646         snd_pcm_format_t format;
1647         unsigned long width;
1648         size_t size;
1649 
1650         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1651         if (substream != NULL) {
1652                 runtime = substream->runtime;
1653                 if (atomic_read(&substream->mmap_count))
1654                         goto __direct;
1655                 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1656                         return err;
1657                 atomic_inc(&runtime->oss.rw_ref);
1658                 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1659                         atomic_dec(&runtime->oss.rw_ref);
1660                         return -ERESTARTSYS;
1661                 }
1662                 format = snd_pcm_oss_format_from(runtime->oss.format);
1663                 width = snd_pcm_format_physical_width(format);
1664                 if (runtime->oss.buffer_used > 0) {
1665 #ifdef OSS_DEBUG
1666                         pcm_dbg(substream->pcm, "sync: buffer_used\n");
1667 #endif
1668                         size = (8 * (runtime->oss.period_bytes - runtime->oss.buffer_used) + 7) / width;
1669                         snd_pcm_format_set_silence(format,
1670                                                    runtime->oss.buffer + runtime->oss.buffer_used,
1671                                                    size);
1672                         err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes);
1673                         if (err < 0)
1674                                 goto unlock;
1675                 } else if (runtime->oss.period_ptr > 0) {
1676 #ifdef OSS_DEBUG
1677                         pcm_dbg(substream->pcm, "sync: period_ptr\n");
1678 #endif
1679                         size = runtime->oss.period_bytes - runtime->oss.period_ptr;
1680                         snd_pcm_format_set_silence(format,
1681                                                    runtime->oss.buffer,
1682                                                    size * 8 / width);
1683                         err = snd_pcm_oss_sync1(substream, size);
1684                         if (err < 0)
1685                                 goto unlock;
1686                 }
1687                 /*
1688                  * The ALSA's period might be a bit large than OSS one.
1689                  * Fill the remain portion of ALSA period with zeros.
1690                  */
1691                 size = runtime->control->appl_ptr % runtime->period_size;
1692                 if (size > 0) {
1693                         size = runtime->period_size - size;
1694                         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED)
1695                                 snd_pcm_lib_write(substream, NULL, size);
1696                         else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1697                                 snd_pcm_lib_writev(substream, NULL, size);
1698                 }
1699 unlock:
1700                 mutex_unlock(&runtime->oss.params_lock);
1701                 atomic_dec(&runtime->oss.rw_ref);
1702                 if (err < 0)
1703                         return err;
1704                 /*
1705                  * finish sync: drain the buffer
1706                  */
1707               __direct:
1708                 saved_f_flags = substream->f_flags;
1709                 substream->f_flags &= ~O_NONBLOCK;
1710                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1711                 substream->f_flags = saved_f_flags;
1712                 if (err < 0)
1713                         return err;
1714                 mutex_lock(&runtime->oss.params_lock);
1715                 runtime->oss.prepare = 1;
1716                 mutex_unlock(&runtime->oss.params_lock);
1717         }
1718 
1719         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
1720         if (substream != NULL) {
1721                 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1722                         return err;
1723                 runtime = substream->runtime;
1724                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1725                 if (err < 0)
1726                         return err;
1727                 mutex_lock(&runtime->oss.params_lock);
1728                 runtime->oss.buffer_used = 0;
1729                 runtime->oss.prepare = 1;
1730                 mutex_unlock(&runtime->oss.params_lock);
1731         }
1732         return 0;
1733 }
1734 
1735 static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)
1736 {
1737         int idx;
1738 
1739         for (idx = 1; idx >= 0; --idx) {
1740                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1741                 struct snd_pcm_runtime *runtime;
1742                 int err;
1743 
1744                 if (substream == NULL)
1745                         continue;
1746                 runtime = substream->runtime;
1747                 if (rate < 1000)
1748                         rate = 1000;
1749                 else if (rate > 192000)
1750                         rate = 192000;
1751                 err = lock_params(runtime);
1752                 if (err < 0)
1753                         return err;
1754                 if (runtime->oss.rate != rate) {
1755                         runtime->oss.params = 1;
1756                         runtime->oss.rate = rate;
1757                 }
1758                 unlock_params(runtime);
1759         }
1760         return snd_pcm_oss_get_rate(pcm_oss_file);
1761 }
1762 
1763 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file)
1764 {
1765         struct snd_pcm_substream *substream;
1766         int err;
1767         
1768         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1769                 return err;
1770         return substream->runtime->oss.rate;
1771 }
1772 
1773 static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels)
1774 {
1775         int idx;
1776         if (channels < 1)
1777                 channels = 1;
1778         if (channels > 128)
1779                 return -EINVAL;
1780         for (idx = 1; idx >= 0; --idx) {
1781                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1782                 struct snd_pcm_runtime *runtime;
1783                 int err;
1784 
1785                 if (substream == NULL)
1786                         continue;
1787                 runtime = substream->runtime;
1788                 err = lock_params(runtime);
1789                 if (err < 0)
1790                         return err;
1791                 if (runtime->oss.channels != channels) {
1792                         runtime->oss.params = 1;
1793                         runtime->oss.channels = channels;
1794                 }
1795                 unlock_params(runtime);
1796         }
1797         return snd_pcm_oss_get_channels(pcm_oss_file);
1798 }
1799 
1800 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file)
1801 {
1802         struct snd_pcm_substream *substream;
1803         int err;
1804         
1805         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1806                 return err;
1807         return substream->runtime->oss.channels;
1808 }
1809 
1810 static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file)
1811 {
1812         struct snd_pcm_substream *substream;
1813         int err;
1814         
1815         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1816                 return err;
1817         return substream->runtime->oss.period_bytes;
1818 }
1819 
1820 static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file)
1821 {
1822         struct snd_pcm_substream *substream;
1823         int err;
1824         int direct;
1825         struct snd_pcm_hw_params *params;
1826         unsigned int formats = 0;
1827         const struct snd_mask *format_mask;
1828         int fmt;
1829 
1830         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1831                 return err;
1832         if (atomic_read(&substream->mmap_count))
1833                 direct = 1;
1834         else
1835                 direct = substream->oss.setup.direct;
1836         if (!direct)
1837                 return AFMT_MU_LAW | AFMT_U8 |
1838                        AFMT_S16_LE | AFMT_S16_BE |
1839                        AFMT_S8 | AFMT_U16_LE |
1840                        AFMT_U16_BE |
1841                         AFMT_S32_LE | AFMT_S32_BE |
1842                         AFMT_S24_LE | AFMT_S24_BE |
1843                         AFMT_S24_PACKED;
1844         params = kmalloc(sizeof(*params), GFP_KERNEL);
1845         if (!params)
1846                 return -ENOMEM;
1847         _snd_pcm_hw_params_any(params);
1848         err = snd_pcm_hw_refine(substream, params);
1849         if (err < 0)
1850                 goto error;
1851         format_mask = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
1852         for (fmt = 0; fmt < 32; ++fmt) {
1853                 if (snd_mask_test(format_mask, fmt)) {
1854                         int f = snd_pcm_oss_format_to(fmt);
1855                         if (f >= 0)
1856                                 formats |= f;
1857                 }
1858         }
1859 
1860  error:
1861         kfree(params);
1862         return err < 0 ? err : formats;
1863 }
1864 
1865 static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format)
1866 {
1867         int formats, idx;
1868         int err;
1869         
1870         if (format != AFMT_QUERY) {
1871                 formats = snd_pcm_oss_get_formats(pcm_oss_file);
1872                 if (formats < 0)
1873                         return formats;
1874                 if (!(formats & format))
1875                         format = AFMT_U8;
1876                 for (idx = 1; idx >= 0; --idx) {
1877                         struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1878                         struct snd_pcm_runtime *runtime;
1879                         if (substream == NULL)
1880                                 continue;
1881                         runtime = substream->runtime;
1882                         err = lock_params(runtime);
1883                         if (err < 0)
1884                                 return err;
1885                         if (runtime->oss.format != format) {
1886                                 runtime->oss.params = 1;
1887                                 runtime->oss.format = format;
1888                         }
1889                         unlock_params(runtime);
1890                 }
1891         }
1892         return snd_pcm_oss_get_format(pcm_oss_file);
1893 }
1894 
1895 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file)
1896 {
1897         struct snd_pcm_substream *substream;
1898         int err;
1899         
1900         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1901                 return err;
1902         return substream->runtime->oss.format;
1903 }
1904 
1905 static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide)
1906 {
1907         struct snd_pcm_runtime *runtime;
1908 
1909         runtime = substream->runtime;
1910         if (subdivide == 0) {
1911                 subdivide = runtime->oss.subdivision;
1912                 if (subdivide == 0)
1913                         subdivide = 1;
1914                 return subdivide;
1915         }
1916         if (runtime->oss.subdivision || runtime->oss.fragshift)
1917                 return -EINVAL;
1918         if (subdivide != 1 && subdivide != 2 && subdivide != 4 &&
1919             subdivide != 8 && subdivide != 16)
1920                 return -EINVAL;
1921         runtime->oss.subdivision = subdivide;
1922         runtime->oss.params = 1;
1923         return subdivide;
1924 }
1925 
1926 static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide)
1927 {
1928         int err = -EINVAL, idx;
1929 
1930         for (idx = 1; idx >= 0; --idx) {
1931                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1932                 struct snd_pcm_runtime *runtime;
1933 
1934                 if (substream == NULL)
1935                         continue;
1936                 runtime = substream->runtime;
1937                 err = lock_params(runtime);
1938                 if (err < 0)
1939                         return err;
1940                 err = snd_pcm_oss_set_subdivide1(substream, subdivide);
1941                 unlock_params(runtime);
1942                 if (err < 0)
1943                         return err;
1944         }
1945         return err;
1946 }
1947 
1948 static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val)
1949 {
1950         struct snd_pcm_runtime *runtime;
1951 
1952         runtime = substream->runtime;
1953         if (runtime->oss.subdivision || runtime->oss.fragshift)
1954                 return -EINVAL;
1955         runtime->oss.fragshift = val & 0xffff;
1956         runtime->oss.maxfrags = (val >> 16) & 0xffff;
1957         if (runtime->oss.fragshift < 4)         /* < 16 */
1958                 runtime->oss.fragshift = 4;
1959         if (runtime->oss.maxfrags < 2)
1960                 runtime->oss.maxfrags = 2;
1961         runtime->oss.params = 1;
1962         return 0;
1963 }
1964 
1965 static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val)
1966 {
1967         int err = -EINVAL, idx;
1968 
1969         for (idx = 1; idx >= 0; --idx) {
1970                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1971                 struct snd_pcm_runtime *runtime;
1972 
1973                 if (substream == NULL)
1974                         continue;
1975                 runtime = substream->runtime;
1976                 err = lock_params(runtime);
1977                 if (err < 0)
1978                         return err;
1979                 err = snd_pcm_oss_set_fragment1(substream, val);
1980                 unlock_params(runtime);
1981                 if (err < 0)
1982                         return err;
1983         }
1984         return err;
1985 }
1986 
1987 static int snd_pcm_oss_nonblock(struct file * file)
1988 {
1989         spin_lock(&file->f_lock);
1990         file->f_flags |= O_NONBLOCK;
1991         spin_unlock(&file->f_lock);
1992         return 0;
1993 }
1994 
1995 static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res)
1996 {
1997 
1998         if (substream == NULL) {
1999                 res &= ~DSP_CAP_DUPLEX;
2000                 return res;
2001         }
2002 #ifdef DSP_CAP_MULTI
2003         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2004                 if (substream->pstr->substream_count > 1)
2005                         res |= DSP_CAP_MULTI;
2006 #endif
2007         /* DSP_CAP_REALTIME is set all times: */
2008         /* all ALSA drivers can return actual pointer in ring buffer */
2009 #if defined(DSP_CAP_REALTIME) && 0
2010         {
2011                 struct snd_pcm_runtime *runtime = substream->runtime;
2012                 if (runtime->info & (SNDRV_PCM_INFO_BLOCK_TRANSFER|SNDRV_PCM_INFO_BATCH))
2013                         res &= ~DSP_CAP_REALTIME;
2014         }
2015 #endif
2016         return res;
2017 }
2018 
2019 static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)
2020 {
2021         int result, idx;
2022         
2023         result = DSP_CAP_TRIGGER | DSP_CAP_MMAP | DSP_CAP_DUPLEX | DSP_CAP_REALTIME;
2024         for (idx = 0; idx < 2; idx++) {
2025                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
2026                 result = snd_pcm_oss_get_caps1(substream, result);
2027         }
2028         result |= 0x0001;       /* revision - same as SB AWE 64 */
2029         return result;
2030 }
2031 
2032 static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
2033                                       snd_pcm_uframes_t hw_ptr)
2034 {
2035         struct snd_pcm_runtime *runtime = substream->runtime;
2036         snd_pcm_uframes_t appl_ptr;
2037         appl_ptr = hw_ptr + runtime->buffer_size;
2038         appl_ptr %= runtime->boundary;
2039         runtime->control->appl_ptr = appl_ptr;
2040 }
2041 
2042 static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger)
2043 {
2044         struct snd_pcm_runtime *runtime;
2045         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2046         int err, cmd;
2047 
2048 #ifdef OSS_DEBUG
2049         pcm_dbg(substream->pcm, "pcm_oss: trigger = 0x%x\n", trigger);
2050 #endif
2051         
2052         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2053         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2054 
2055         if (psubstream) {
2056                 if ((err = snd_pcm_oss_make_ready(psubstream)) < 0)
2057                         return err;
2058         }
2059         if (csubstream) {
2060                 if ((err = snd_pcm_oss_make_ready(csubstream)) < 0)
2061                         return err;
2062         }
2063         if (psubstream) {
2064                 runtime = psubstream->runtime;
2065                 cmd = 0;
2066                 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2067                         return -ERESTARTSYS;
2068                 if (trigger & PCM_ENABLE_OUTPUT) {
2069                         if (runtime->oss.trigger)
2070                                 goto _skip1;
2071                         if (atomic_read(&psubstream->mmap_count))
2072                                 snd_pcm_oss_simulate_fill(psubstream,
2073                                                 get_hw_ptr_period(runtime));
2074                         runtime->oss.trigger = 1;
2075                         runtime->start_threshold = 1;
2076                         cmd = SNDRV_PCM_IOCTL_START;
2077                 } else {
2078                         if (!runtime->oss.trigger)
2079                                 goto _skip1;
2080                         runtime->oss.trigger = 0;
2081                         runtime->start_threshold = runtime->boundary;
2082                         cmd = SNDRV_PCM_IOCTL_DROP;
2083                         runtime->oss.prepare = 1;
2084                 }
2085  _skip1:
2086                 mutex_unlock(&runtime->oss.params_lock);
2087                 if (cmd) {
2088                         err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL);
2089                         if (err < 0)
2090                                 return err;
2091                 }
2092         }
2093         if (csubstream) {
2094                 runtime = csubstream->runtime;
2095                 cmd = 0;
2096                 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2097                         return -ERESTARTSYS;
2098                 if (trigger & PCM_ENABLE_INPUT) {
2099                         if (runtime->oss.trigger)
2100                                 goto _skip2;
2101                         runtime->oss.trigger = 1;
2102                         runtime->start_threshold = 1;
2103                         cmd = SNDRV_PCM_IOCTL_START;
2104                 } else {
2105                         if (!runtime->oss.trigger)
2106                                 goto _skip2;
2107                         runtime->oss.trigger = 0;
2108                         runtime->start_threshold = runtime->boundary;
2109                         cmd = SNDRV_PCM_IOCTL_DROP;
2110                         runtime->oss.prepare = 1;
2111                 }
2112  _skip2:
2113                 mutex_unlock(&runtime->oss.params_lock);
2114                 if (cmd) {
2115                         err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL);
2116                         if (err < 0)
2117                                 return err;
2118                 }
2119         }
2120         return 0;
2121 }
2122 
2123 static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file)
2124 {
2125         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2126         int result = 0;
2127 
2128         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2129         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2130         if (psubstream && psubstream->runtime && psubstream->runtime->oss.trigger)
2131                 result |= PCM_ENABLE_OUTPUT;
2132         if (csubstream && csubstream->runtime && csubstream->runtime->oss.trigger)
2133                 result |= PCM_ENABLE_INPUT;
2134         return result;
2135 }
2136 
2137 static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file)
2138 {
2139         struct snd_pcm_substream *substream;
2140         struct snd_pcm_runtime *runtime;
2141         snd_pcm_sframes_t delay;
2142         int err;
2143 
2144         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2145         if (substream == NULL)
2146                 return -EINVAL;
2147         if ((err = snd_pcm_oss_make_ready(substream)) < 0)
2148                 return err;
2149         runtime = substream->runtime;
2150         if (runtime->oss.params || runtime->oss.prepare)
2151                 return 0;
2152         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2153         if (err == -EPIPE)
2154                 delay = 0;      /* hack for broken OSS applications */
2155         else if (err < 0)
2156                 return err;
2157         return snd_pcm_oss_bytes(substream, delay);
2158 }
2159 
2160 static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info)
2161 {       
2162         struct snd_pcm_substream *substream;
2163         struct snd_pcm_runtime *runtime;
2164         snd_pcm_sframes_t delay;
2165         int fixup;
2166         struct count_info info;
2167         int err;
2168 
2169         if (_info == NULL)
2170                 return -EFAULT;
2171         substream = pcm_oss_file->streams[stream];
2172         if (substream == NULL)
2173                 return -EINVAL;
2174         if ((err = snd_pcm_oss_make_ready(substream)) < 0)
2175                 return err;
2176         runtime = substream->runtime;
2177         if (runtime->oss.params || runtime->oss.prepare) {
2178                 memset(&info, 0, sizeof(info));
2179                 if (copy_to_user(_info, &info, sizeof(info)))
2180                         return -EFAULT;
2181                 return 0;
2182         }
2183         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2184                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2185                 if (err == -EPIPE || err == -ESTRPIPE || (! err && delay < 0)) {
2186                         err = 0;
2187                         delay = 0;
2188                         fixup = 0;
2189                 } else {
2190                         fixup = runtime->oss.buffer_used;
2191                 }
2192         } else {
2193                 err = snd_pcm_oss_capture_position_fixup(substream, &delay);
2194                 fixup = -runtime->oss.buffer_used;
2195         }
2196         if (err < 0)
2197                 return err;
2198         info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size);
2199         if (atomic_read(&substream->mmap_count)) {
2200                 snd_pcm_sframes_t n;
2201                 delay = get_hw_ptr_period(runtime);
2202                 n = delay - runtime->oss.prev_hw_ptr_period;
2203                 if (n < 0)
2204                         n += runtime->boundary;
2205                 info.blocks = n / runtime->period_size;
2206                 runtime->oss.prev_hw_ptr_period = delay;
2207                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2208                         snd_pcm_oss_simulate_fill(substream, delay);
2209                 info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
2210         } else {
2211                 delay = snd_pcm_oss_bytes(substream, delay);
2212                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2213                         if (substream->oss.setup.buggyptr)
2214                                 info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
2215                         else
2216                                 info.blocks = (delay + fixup) / runtime->oss.period_bytes;
2217                         info.bytes = (runtime->oss.bytes - delay) & INT_MAX;
2218                 } else {
2219                         delay += fixup;
2220                         info.blocks = delay / runtime->oss.period_bytes;
2221                         info.bytes = (runtime->oss.bytes + delay) & INT_MAX;
2222                 }
2223         }
2224         if (copy_to_user(_info, &info, sizeof(info)))
2225                 return -EFAULT;
2226         return 0;
2227 }
2228 
2229 static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info)
2230 {
2231         struct snd_pcm_substream *substream;
2232         struct snd_pcm_runtime *runtime;
2233         snd_pcm_sframes_t avail;
2234         int fixup;
2235         struct audio_buf_info info;
2236         int err;
2237 
2238         if (_info == NULL)
2239                 return -EFAULT;
2240         substream = pcm_oss_file->streams[stream];
2241         if (substream == NULL)
2242                 return -EINVAL;
2243         runtime = substream->runtime;
2244 
2245         if (runtime->oss.params &&
2246             (err = snd_pcm_oss_change_params(substream, false)) < 0)
2247                 return err;
2248 
2249         info.fragsize = runtime->oss.period_bytes;
2250         info.fragstotal = runtime->periods;
2251         if (runtime->oss.prepare) {
2252                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2253                         info.bytes = runtime->oss.period_bytes * runtime->oss.periods;
2254                         info.fragments = runtime->oss.periods;
2255                 } else {
2256                         info.bytes = 0;
2257                         info.fragments = 0;
2258                 }
2259         } else {
2260                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2261                         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &avail);
2262                         if (err == -EPIPE || err == -ESTRPIPE || (! err && avail < 0)) {
2263                                 avail = runtime->buffer_size;
2264                                 err = 0;
2265                                 fixup = 0;
2266                         } else {
2267                                 avail = runtime->buffer_size - avail;
2268                                 fixup = -runtime->oss.buffer_used;
2269                         }
2270                 } else {
2271                         err = snd_pcm_oss_capture_position_fixup(substream, &avail);
2272                         fixup = runtime->oss.buffer_used;
2273                 }
2274                 if (err < 0)
2275                         return err;
2276                 info.bytes = snd_pcm_oss_bytes(substream, avail) + fixup;
2277                 info.fragments = info.bytes / runtime->oss.period_bytes;
2278         }
2279 
2280 #ifdef OSS_DEBUG
2281         pcm_dbg(substream->pcm,
2282                 "pcm_oss: space: bytes = %i, fragments = %i, fragstotal = %i, fragsize = %i\n",
2283                 info.bytes, info.fragments, info.fragstotal, info.fragsize);
2284 #endif
2285         if (copy_to_user(_info, &info, sizeof(info)))
2286                 return -EFAULT;
2287         return 0;
2288 }
2289 
2290 static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info)
2291 {
2292         // it won't be probably implemented
2293         // pr_debug("TODO: snd_pcm_oss_get_mapbuf\n");
2294         return -EINVAL;
2295 }
2296 
2297 static const char *strip_task_path(const char *path)
2298 {
2299         const char *ptr, *ptrl = NULL;
2300         for (ptr = path; *ptr; ptr++) {
2301                 if (*ptr == '/')
2302                         ptrl = ptr + 1;
2303         }
2304         return ptrl;
2305 }
2306 
2307 static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
2308                                       const char *task_name,
2309                                       struct snd_pcm_oss_setup *rsetup)
2310 {
2311         struct snd_pcm_oss_setup *setup;
2312 
2313         mutex_lock(&pcm->streams[stream].oss.setup_mutex);
2314         do {
2315                 for (setup = pcm->streams[stream].oss.setup_list; setup;
2316                      setup = setup->next) {
2317                         if (!strcmp(setup->task_name, task_name))
2318                                 goto out;
2319                 }
2320         } while ((task_name = strip_task_path(task_name)) != NULL);
2321  out:
2322         if (setup)
2323                 *rsetup = *setup;
2324         mutex_unlock(&pcm->streams[stream].oss.setup_mutex);
2325 }
2326 
2327 static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream)
2328 {
2329         struct snd_pcm_runtime *runtime;
2330         runtime = substream->runtime;
2331         vfree(runtime->oss.buffer);
2332         runtime->oss.buffer = NULL;
2333 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2334         snd_pcm_oss_plugin_clear(substream);
2335 #endif
2336         substream->oss.oss = 0;
2337 }
2338 
2339 static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
2340                                        struct snd_pcm_oss_setup *setup,
2341                                        int minor)
2342 {
2343         struct snd_pcm_runtime *runtime;
2344 
2345         substream->oss.oss = 1;
2346         substream->oss.setup = *setup;
2347         if (setup->nonblock)
2348                 substream->f_flags |= O_NONBLOCK;
2349         else if (setup->block)
2350                 substream->f_flags &= ~O_NONBLOCK;
2351         runtime = substream->runtime;
2352         runtime->oss.params = 1;
2353         runtime->oss.trigger = 1;
2354         runtime->oss.rate = 8000;
2355         mutex_init(&runtime->oss.params_lock);
2356         switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
2357         case SNDRV_MINOR_OSS_PCM_8:
2358                 runtime->oss.format = AFMT_U8;
2359                 break;
2360         case SNDRV_MINOR_OSS_PCM_16:
2361                 runtime->oss.format = AFMT_S16_LE;
2362                 break;
2363         default:
2364                 runtime->oss.format = AFMT_MU_LAW;
2365         }
2366         runtime->oss.channels = 1;
2367         runtime->oss.fragshift = 0;
2368         runtime->oss.maxfrags = 0;
2369         runtime->oss.subdivision = 0;
2370         substream->pcm_release = snd_pcm_oss_release_substream;
2371         atomic_set(&runtime->oss.rw_ref, 0);
2372 }
2373 
2374 static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file)
2375 {
2376         int cidx;
2377         if (!pcm_oss_file)
2378                 return 0;
2379         for (cidx = 0; cidx < 2; ++cidx) {
2380                 struct snd_pcm_substream *substream = pcm_oss_file->streams[cidx];
2381                 if (substream)
2382                         snd_pcm_release_substream(substream);
2383         }
2384         kfree(pcm_oss_file);
2385         return 0;
2386 }
2387 
2388 static int snd_pcm_oss_open_file(struct file *file,
2389                                  struct snd_pcm *pcm,
2390                                  struct snd_pcm_oss_file **rpcm_oss_file,
2391                                  int minor,
2392                                  struct snd_pcm_oss_setup *setup)
2393 {
2394         int idx, err;
2395         struct snd_pcm_oss_file *pcm_oss_file;
2396         struct snd_pcm_substream *substream;
2397         fmode_t f_mode = file->f_mode;
2398 
2399         if (rpcm_oss_file)
2400                 *rpcm_oss_file = NULL;
2401 
2402         pcm_oss_file = kzalloc(sizeof(*pcm_oss_file), GFP_KERNEL);
2403         if (pcm_oss_file == NULL)
2404                 return -ENOMEM;
2405 
2406         if ((f_mode & (FMODE_WRITE|FMODE_READ)) == (FMODE_WRITE|FMODE_READ) &&
2407             (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX))
2408                 f_mode = FMODE_WRITE;
2409 
2410         file->f_flags &= ~O_APPEND;
2411         for (idx = 0; idx < 2; idx++) {
2412                 if (setup[idx].disable)
2413                         continue;
2414                 if (! pcm->streams[idx].substream_count)
2415                         continue; /* no matching substream */
2416                 if (idx == SNDRV_PCM_STREAM_PLAYBACK) {
2417                         if (! (f_mode & FMODE_WRITE))
2418                                 continue;
2419                 } else {
2420                         if (! (f_mode & FMODE_READ))
2421                                 continue;
2422                 }
2423                 err = snd_pcm_open_substream(pcm, idx, file, &substream);
2424                 if (err < 0) {
2425                         snd_pcm_oss_release_file(pcm_oss_file);
2426                         return err;
2427                 }
2428 
2429                 pcm_oss_file->streams[idx] = substream;
2430                 substream->file = pcm_oss_file;
2431                 snd_pcm_oss_init_substream(substream, &setup[idx], minor);
2432         }
2433         
2434         if (!pcm_oss_file->streams[0] && !pcm_oss_file->streams[1]) {
2435                 snd_pcm_oss_release_file(pcm_oss_file);
2436                 return -EINVAL;
2437         }
2438 
2439         file->private_data = pcm_oss_file;
2440         if (rpcm_oss_file)
2441                 *rpcm_oss_file = pcm_oss_file;
2442         return 0;
2443 }
2444 
2445 
2446 static int snd_task_name(struct task_struct *task, char *name, size_t size)
2447 {
2448         unsigned int idx;
2449 
2450         if (snd_BUG_ON(!task || !name || size < 2))
2451                 return -EINVAL;
2452         for (idx = 0; idx < sizeof(task->comm) && idx + 1 < size; idx++)
2453                 name[idx] = task->comm[idx];
2454         name[idx] = '\0';
2455         return 0;
2456 }
2457 
2458 static int snd_pcm_oss_open(struct inode *inode, struct file *file)
2459 {
2460         int err;
2461         char task_name[32];
2462         struct snd_pcm *pcm;
2463         struct snd_pcm_oss_file *pcm_oss_file;
2464         struct snd_pcm_oss_setup setup[2];
2465         int nonblock;
2466         wait_queue_entry_t wait;
2467 
2468         err = nonseekable_open(inode, file);
2469         if (err < 0)
2470                 return err;
2471 
2472         pcm = snd_lookup_oss_minor_data(iminor(inode),
2473                                         SNDRV_OSS_DEVICE_TYPE_PCM);
2474         if (pcm == NULL) {
2475                 err = -ENODEV;
2476                 goto __error1;
2477         }
2478         err = snd_card_file_add(pcm->card, file);
2479         if (err < 0)
2480                 goto __error1;
2481         if (!try_module_get(pcm->card->module)) {
2482                 err = -EFAULT;
2483                 goto __error2;
2484         }
2485         if (snd_task_name(current, task_name, sizeof(task_name)) < 0) {
2486                 err = -EFAULT;
2487                 goto __error;
2488         }
2489         memset(setup, 0, sizeof(setup));
2490         if (file->f_mode & FMODE_WRITE)
2491                 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_PLAYBACK,
2492                                            task_name, &setup[0]);
2493         if (file->f_mode & FMODE_READ)
2494                 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_CAPTURE,
2495                                            task_name, &setup[1]);
2496 
2497         nonblock = !!(file->f_flags & O_NONBLOCK);
2498         if (!nonblock)
2499                 nonblock = nonblock_open;
2500 
2501         init_waitqueue_entry(&wait, current);
2502         add_wait_queue(&pcm->open_wait, &wait);
2503         mutex_lock(&pcm->open_mutex);
2504         while (1) {
2505                 err = snd_pcm_oss_open_file(file, pcm, &pcm_oss_file,
2506                                             iminor(inode), setup);
2507                 if (err >= 0)
2508                         break;
2509                 if (err == -EAGAIN) {
2510                         if (nonblock) {
2511                                 err = -EBUSY;
2512                                 break;
2513                         }
2514                 } else
2515                         break;
2516                 set_current_state(TASK_INTERRUPTIBLE);
2517                 mutex_unlock(&pcm->open_mutex);
2518                 schedule();
2519                 mutex_lock(&pcm->open_mutex);
2520                 if (pcm->card->shutdown) {
2521                         err = -ENODEV;
2522                         break;
2523                 }
2524                 if (signal_pending(current)) {
2525                         err = -ERESTARTSYS;
2526                         break;
2527                 }
2528         }
2529         remove_wait_queue(&pcm->open_wait, &wait);
2530         mutex_unlock(&pcm->open_mutex);
2531         if (err < 0)
2532                 goto __error;
2533         snd_card_unref(pcm->card);
2534         return err;
2535 
2536       __error:
2537         module_put(pcm->card->module);
2538       __error2:
2539         snd_card_file_remove(pcm->card, file);
2540       __error1:
2541         if (pcm)
2542                 snd_card_unref(pcm->card);
2543         return err;
2544 }
2545 
2546 static int snd_pcm_oss_release(struct inode *inode, struct file *file)
2547 {
2548         struct snd_pcm *pcm;
2549         struct snd_pcm_substream *substream;
2550         struct snd_pcm_oss_file *pcm_oss_file;
2551 
2552         pcm_oss_file = file->private_data;
2553         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2554         if (substream == NULL)
2555                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2556         if (snd_BUG_ON(!substream))
2557                 return -ENXIO;
2558         pcm = substream->pcm;
2559         if (!pcm->card->shutdown)
2560                 snd_pcm_oss_sync(pcm_oss_file);
2561         mutex_lock(&pcm->open_mutex);
2562         snd_pcm_oss_release_file(pcm_oss_file);
2563         mutex_unlock(&pcm->open_mutex);
2564         wake_up(&pcm->open_wait);
2565         module_put(pcm->card->module);
2566         snd_card_file_remove(pcm->card, file);
2567         return 0;
2568 }
2569 
2570 static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2571 {
2572         struct snd_pcm_oss_file *pcm_oss_file;
2573         int __user *p = (int __user *)arg;
2574         int res;
2575 
2576         pcm_oss_file = file->private_data;
2577         if (cmd == OSS_GETVERSION)
2578                 return put_user(SNDRV_OSS_VERSION, p);
2579         if (cmd == OSS_ALSAEMULVER)
2580                 return put_user(1, p);
2581 #if IS_REACHABLE(CONFIG_SND_MIXER_OSS)
2582         if (((cmd >> 8) & 0xff) == 'M') {       /* mixer ioctl - for OSS compatibility */
2583                 struct snd_pcm_substream *substream;
2584                 int idx;
2585                 for (idx = 0; idx < 2; ++idx) {
2586                         substream = pcm_oss_file->streams[idx];
2587                         if (substream != NULL)
2588                                 break;
2589                 }
2590                 if (snd_BUG_ON(idx >= 2))
2591                         return -ENXIO;
2592                 return snd_mixer_oss_ioctl_card(substream->pcm->card, cmd, arg);
2593         }
2594 #endif
2595         if (((cmd >> 8) & 0xff) != 'P')
2596                 return -EINVAL;
2597 #ifdef OSS_DEBUG
2598         pr_debug("pcm_oss: ioctl = 0x%x\n", cmd);
2599 #endif
2600         switch (cmd) {
2601         case SNDCTL_DSP_RESET:
2602                 return snd_pcm_oss_reset(pcm_oss_file);
2603         case SNDCTL_DSP_SYNC:
2604                 return snd_pcm_oss_sync(pcm_oss_file);
2605         case SNDCTL_DSP_SPEED:
2606                 if (get_user(res, p))
2607                         return -EFAULT;
2608                 if ((res = snd_pcm_oss_set_rate(pcm_oss_file, res))<0)
2609                         return res;
2610                 return put_user(res, p);
2611         case SOUND_PCM_READ_RATE:
2612                 res = snd_pcm_oss_get_rate(pcm_oss_file);
2613                 if (res < 0)
2614                         return res;
2615                 return put_user(res, p);
2616         case SNDCTL_DSP_STEREO:
2617                 if (get_user(res, p))
2618                         return -EFAULT;
2619                 res = res > 0 ? 2 : 1;
2620                 if ((res = snd_pcm_oss_set_channels(pcm_oss_file, res)) < 0)
2621                         return res;
2622                 return put_user(--res, p);
2623         case SNDCTL_DSP_GETBLKSIZE:
2624                 res = snd_pcm_oss_get_block_size(pcm_oss_file);
2625                 if (res < 0)
2626                         return res;
2627                 return put_user(res, p);
2628         case SNDCTL_DSP_SETFMT:
2629                 if (get_user(res, p))
2630                         return -EFAULT;
2631                 res = snd_pcm_oss_set_format(pcm_oss_file, res);
2632                 if (res < 0)
2633                         return res;
2634                 return put_user(res, p);
2635         case SOUND_PCM_READ_BITS:
2636                 res = snd_pcm_oss_get_format(pcm_oss_file);
2637                 if (res < 0)
2638                         return res;
2639                 return put_user(res, p);
2640         case SNDCTL_DSP_CHANNELS:
2641                 if (get_user(res, p))
2642                         return -EFAULT;
2643                 res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2644                 if (res < 0)
2645                         return res;
2646                 return put_user(res, p);
2647         case SOUND_PCM_READ_CHANNELS:
2648                 res = snd_pcm_oss_get_channels(pcm_oss_file);
2649                 if (res < 0)
2650                         return res;
2651                 return put_user(res, p);
2652         case SOUND_PCM_WRITE_FILTER:
2653         case SOUND_PCM_READ_FILTER:
2654                 return -EIO;
2655         case SNDCTL_DSP_POST:
2656                 return snd_pcm_oss_post(pcm_oss_file);
2657         case SNDCTL_DSP_SUBDIVIDE:
2658                 if (get_user(res, p))
2659                         return -EFAULT;
2660                 res = snd_pcm_oss_set_subdivide(pcm_oss_file, res);
2661                 if (res < 0)
2662                         return res;
2663                 return put_user(res, p);
2664         case SNDCTL_DSP_SETFRAGMENT:
2665                 if (get_user(res, p))
2666                         return -EFAULT;
2667                 return snd_pcm_oss_set_fragment(pcm_oss_file, res);
2668         case SNDCTL_DSP_GETFMTS:
2669                 res = snd_pcm_oss_get_formats(pcm_oss_file);
2670                 if (res < 0)
2671                         return res;
2672                 return put_user(res, p);
2673         case SNDCTL_DSP_GETOSPACE:
2674         case SNDCTL_DSP_GETISPACE:
2675                 return snd_pcm_oss_get_space(pcm_oss_file,
2676                         cmd == SNDCTL_DSP_GETISPACE ?
2677                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2678                         (struct audio_buf_info __user *) arg);
2679         case SNDCTL_DSP_NONBLOCK:
2680                 return snd_pcm_oss_nonblock(file);
2681         case SNDCTL_DSP_GETCAPS:
2682                 res = snd_pcm_oss_get_caps(pcm_oss_file);
2683                 if (res < 0)
2684                         return res;
2685                 return put_user(res, p);
2686         case SNDCTL_DSP_GETTRIGGER:
2687                 res = snd_pcm_oss_get_trigger(pcm_oss_file);
2688                 if (res < 0)
2689                         return res;
2690                 return put_user(res, p);
2691         case SNDCTL_DSP_SETTRIGGER:
2692                 if (get_user(res, p))
2693                         return -EFAULT;
2694                 return snd_pcm_oss_set_trigger(pcm_oss_file, res);
2695         case SNDCTL_DSP_GETIPTR:
2696         case SNDCTL_DSP_GETOPTR:
2697                 return snd_pcm_oss_get_ptr(pcm_oss_file,
2698                         cmd == SNDCTL_DSP_GETIPTR ?
2699                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2700                         (struct count_info __user *) arg);
2701         case SNDCTL_DSP_MAPINBUF:
2702         case SNDCTL_DSP_MAPOUTBUF:
2703                 return snd_pcm_oss_get_mapbuf(pcm_oss_file,
2704                         cmd == SNDCTL_DSP_MAPINBUF ?
2705                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2706                         (struct buffmem_desc __user *) arg);
2707         case SNDCTL_DSP_SETSYNCRO:
2708                 /* stop DMA now.. */
2709                 return 0;
2710         case SNDCTL_DSP_SETDUPLEX:
2711                 if (snd_pcm_oss_get_caps(pcm_oss_file) & DSP_CAP_DUPLEX)
2712                         return 0;
2713                 return -EIO;
2714         case SNDCTL_DSP_GETODELAY:
2715                 res = snd_pcm_oss_get_odelay(pcm_oss_file);
2716                 if (res < 0) {
2717                         /* it's for sure, some broken apps don't check for error codes */
2718                         put_user(0, p);
2719                         return res;
2720                 }
2721                 return put_user(res, p);
2722         case SNDCTL_DSP_PROFILE:
2723                 return 0;       /* silently ignore */
2724         default:
2725                 pr_debug("pcm_oss: unknown command = 0x%x\n", cmd);
2726         }
2727         return -EINVAL;
2728 }
2729 
2730 #ifdef CONFIG_COMPAT
2731 /* all compatible */
2732 static long snd_pcm_oss_ioctl_compat(struct file *file, unsigned int cmd,
2733                                      unsigned long arg)
2734 {
2735         return snd_pcm_oss_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2736 }
2737 #else
2738 #define snd_pcm_oss_ioctl_compat        NULL
2739 #endif
2740 
2741 static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
2742 {
2743         struct snd_pcm_oss_file *pcm_oss_file;
2744         struct snd_pcm_substream *substream;
2745 
2746         pcm_oss_file = file->private_data;
2747         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2748         if (substream == NULL)
2749                 return -ENXIO;
2750         substream->f_flags = file->f_flags & O_NONBLOCK;
2751 #ifndef OSS_DEBUG
2752         return snd_pcm_oss_read1(substream, buf, count);
2753 #else
2754         {
2755                 ssize_t res = snd_pcm_oss_read1(substream, buf, count);
2756                 pcm_dbg(substream->pcm,
2757                         "pcm_oss: read %li bytes (returned %li bytes)\n",
2758                         (long)count, (long)res);
2759                 return res;
2760         }
2761 #endif
2762 }
2763 
2764 static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
2765 {
2766         struct snd_pcm_oss_file *pcm_oss_file;
2767         struct snd_pcm_substream *substream;
2768         long result;
2769 
2770         pcm_oss_file = file->private_data;
2771         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2772         if (substream == NULL)
2773                 return -ENXIO;
2774         substream->f_flags = file->f_flags & O_NONBLOCK;
2775         result = snd_pcm_oss_write1(substream, buf, count);
2776 #ifdef OSS_DEBUG
2777         pcm_dbg(substream->pcm, "pcm_oss: write %li bytes (wrote %li bytes)\n",
2778                (long)count, (long)result);
2779 #endif
2780         return result;
2781 }
2782 
2783 static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)
2784 {
2785         struct snd_pcm_runtime *runtime = substream->runtime;
2786         if (atomic_read(&substream->mmap_count))
2787                 return runtime->oss.prev_hw_ptr_period !=
2788                                                 get_hw_ptr_period(runtime);
2789         else
2790                 return snd_pcm_playback_avail(runtime) >=
2791                                                 runtime->oss.period_frames;
2792 }
2793 
2794 static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)
2795 {
2796         struct snd_pcm_runtime *runtime = substream->runtime;
2797         if (atomic_read(&substream->mmap_count))
2798                 return runtime->oss.prev_hw_ptr_period !=
2799                                                 get_hw_ptr_period(runtime);
2800         else
2801                 return snd_pcm_capture_avail(runtime) >=
2802                                                 runtime->oss.period_frames;
2803 }
2804 
2805 static __poll_t snd_pcm_oss_poll(struct file *file, poll_table * wait)
2806 {
2807         struct snd_pcm_oss_file *pcm_oss_file;
2808         __poll_t mask;
2809         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2810         
2811         pcm_oss_file = file->private_data;
2812 
2813         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2814         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2815 
2816         mask = 0;
2817         if (psubstream != NULL) {
2818                 struct snd_pcm_runtime *runtime = psubstream->runtime;
2819                 poll_wait(file, &runtime->sleep, wait);
2820                 snd_pcm_stream_lock_irq(psubstream);
2821                 if (runtime->status->state != SNDRV_PCM_STATE_DRAINING &&
2822                     (runtime->status->state != SNDRV_PCM_STATE_RUNNING ||
2823                      snd_pcm_oss_playback_ready(psubstream)))
2824                         mask |= EPOLLOUT | EPOLLWRNORM;
2825                 snd_pcm_stream_unlock_irq(psubstream);
2826         }
2827         if (csubstream != NULL) {
2828                 struct snd_pcm_runtime *runtime = csubstream->runtime;
2829                 snd_pcm_state_t ostate;
2830                 poll_wait(file, &runtime->sleep, wait);
2831                 snd_pcm_stream_lock_irq(csubstream);
2832                 if ((ostate = runtime->status->state) != SNDRV_PCM_STATE_RUNNING ||
2833                     snd_pcm_oss_capture_ready(csubstream))
2834                         mask |= EPOLLIN | EPOLLRDNORM;
2835                 snd_pcm_stream_unlock_irq(csubstream);
2836                 if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) {
2837                         struct snd_pcm_oss_file ofile;
2838                         memset(&ofile, 0, sizeof(ofile));
2839                         ofile.streams[SNDRV_PCM_STREAM_CAPTURE] = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2840                         runtime->oss.trigger = 0;
2841                         snd_pcm_oss_set_trigger(&ofile, PCM_ENABLE_INPUT);
2842                 }
2843         }
2844 
2845         return mask;
2846 }
2847 
2848 static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area)
2849 {
2850         struct snd_pcm_oss_file *pcm_oss_file;
2851         struct snd_pcm_substream *substream = NULL;
2852         struct snd_pcm_runtime *runtime;
2853         int err;
2854 
2855 #ifdef OSS_DEBUG
2856         pr_debug("pcm_oss: mmap begin\n");
2857 #endif
2858         pcm_oss_file = file->private_data;
2859         switch ((area->vm_flags & (VM_READ | VM_WRITE))) {
2860         case VM_READ | VM_WRITE:
2861                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2862                 if (substream)
2863                         break;
2864                 /* Fall through */
2865         case VM_READ:
2866                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2867                 break;
2868         case VM_WRITE:
2869                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2870                 break;
2871         default:
2872                 return -EINVAL;
2873         }
2874         /* set VM_READ access as well to fix memset() routines that do
2875            reads before writes (to improve performance) */
2876         area->vm_flags |= VM_READ;
2877         if (substream == NULL)
2878                 return -ENXIO;
2879         runtime = substream->runtime;
2880         if (!(runtime->info & SNDRV_PCM_INFO_MMAP_VALID))
2881                 return -EIO;
2882         if (runtime->info & SNDRV_PCM_INFO_INTERLEAVED)
2883                 runtime->access = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2884         else
2885                 return -EIO;
2886         
2887         if (runtime->oss.params) {
2888                 /* use mutex_trylock() for params_lock for avoiding a deadlock
2889                  * between mmap_sem and params_lock taken by
2890                  * copy_from/to_user() in snd_pcm_oss_write/read()
2891                  */
2892                 err = snd_pcm_oss_change_params(substream, true);
2893                 if (err < 0)
2894                         return err;
2895         }
2896 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2897         if (runtime->oss.plugin_first != NULL)
2898                 return -EIO;
2899 #endif
2900 
2901         if (area->vm_pgoff != 0)
2902                 return -EINVAL;
2903 
2904         err = snd_pcm_mmap_data(substream, file, area);
2905         if (err < 0)
2906                 return err;
2907         runtime->oss.mmap_bytes = area->vm_end - area->vm_start;
2908         runtime->silence_threshold = 0;
2909         runtime->silence_size = 0;
2910 #ifdef OSS_DEBUG
2911         pr_debug("pcm_oss: mmap ok, bytes = 0x%x\n",
2912                runtime->oss.mmap_bytes);
2913 #endif
2914         /* In mmap mode we never stop */
2915         runtime->stop_threshold = runtime->boundary;
2916 
2917         return 0;
2918 }
2919 
2920 #ifdef CONFIG_SND_VERBOSE_PROCFS
2921 /*
2922  *  /proc interface
2923  */
2924 
2925 static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
2926                                   struct snd_info_buffer *buffer)
2927 {
2928         struct snd_pcm_str *pstr = entry->private_data;
2929         struct snd_pcm_oss_setup *setup = pstr->oss.setup_list;
2930         mutex_lock(&pstr->oss.setup_mutex);
2931         while (setup) {
2932                 snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s\n",
2933                             setup->task_name,
2934                             setup->periods,
2935                             setup->period_size,
2936                             setup->disable ? " disable" : "",
2937                             setup->direct ? " direct" : "",
2938                             setup->block ? " block" : "",
2939                             setup->nonblock ? " non-block" : "",
2940                             setup->partialfrag ? " partial-frag" : "",
2941                             setup->nosilence ? " no-silence" : "");
2942                 setup = setup->next;
2943         }
2944         mutex_unlock(&pstr->oss.setup_mutex);
2945 }
2946 
2947 static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)
2948 {
2949         struct snd_pcm_oss_setup *setup, *setupn;
2950 
2951         for (setup = pstr->oss.setup_list, pstr->oss.setup_list = NULL;
2952              setup; setup = setupn) {
2953                 setupn = setup->next;
2954                 kfree(setup->task_name);
2955                 kfree(setup);
2956         }
2957         pstr->oss.setup_list = NULL;
2958 }
2959 
2960 static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
2961                                    struct snd_info_buffer *buffer)
2962 {
2963         struct snd_pcm_str *pstr = entry->private_data;
2964         char line[128], str[32], task_name[32];
2965         const char *ptr;
2966         int idx1;
2967         struct snd_pcm_oss_setup *setup, *setup1, template;
2968 
2969         while (!snd_info_get_line(buffer, line, sizeof(line))) {
2970                 mutex_lock(&pstr->oss.setup_mutex);
2971                 memset(&template, 0, sizeof(template));
2972                 ptr = snd_info_get_str(task_name, line, sizeof(task_name));
2973                 if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) {
2974                         snd_pcm_oss_proc_free_setup_list(pstr);
2975                         mutex_unlock(&pstr->oss.setup_mutex);
2976                         continue;
2977                 }
2978                 for (setup = pstr->oss.setup_list; setup; setup = setup->next) {
2979                         if (!strcmp(setup->task_name, task_name)) {
2980                                 template = *setup;
2981                                 break;
2982                         }
2983                 }
2984                 ptr = snd_info_get_str(str, ptr, sizeof(str));
2985                 template.periods = simple_strtoul(str, NULL, 10);
2986                 ptr = snd_info_get_str(str, ptr, sizeof(str));
2987                 template.period_size = simple_strtoul(str, NULL, 10);
2988                 for (idx1 = 31; idx1 >= 0; idx1--)
2989                         if (template.period_size & (1 << idx1))
2990                                 break;
2991                 for (idx1--; idx1 >= 0; idx1--)
2992                         template.period_size &= ~(1 << idx1);
2993                 do {
2994                         ptr = snd_info_get_str(str, ptr, sizeof(str));
2995                         if (!strcmp(str, "disable")) {
2996                                 template.disable = 1;
2997                         } else if (!strcmp(str, "direct")) {
2998                                 template.direct = 1;
2999                         } else if (!strcmp(str, "block")) {
3000                                 template.block = 1;
3001                         } else if (!strcmp(str, "non-block")) {
3002                                 template.nonblock = 1;
3003                         } else if (!strcmp(str, "partial-frag")) {
3004                                 template.partialfrag = 1;
3005                         } else if (!strcmp(str, "no-silence")) {
3006                                 template.nosilence = 1;
3007                         } else if (!strcmp(str, "buggy-ptr")) {
3008                                 template.buggyptr = 1;
3009                         }
3010                 } while (*str);
3011                 if (setup == NULL) {
3012                         setup = kmalloc(sizeof(*setup), GFP_KERNEL);
3013                         if (! setup) {
3014                                 buffer->error = -ENOMEM;
3015                                 mutex_unlock(&pstr->oss.setup_mutex);
3016                                 return;
3017                         }
3018                         if (pstr->oss.setup_list == NULL)
3019                                 pstr->oss.setup_list = setup;
3020                         else {
3021                                 for (setup1 = pstr->oss.setup_list;
3022                                      setup1->next; setup1 = setup1->next);
3023                                 setup1->next = setup;
3024                         }
3025                         template.task_name = kstrdup(task_name, GFP_KERNEL);
3026                         if (! template.task_name) {
3027                                 kfree(setup);
3028                                 buffer->error = -ENOMEM;
3029                                 mutex_unlock(&pstr->oss.setup_mutex);
3030                                 return;
3031                         }
3032                 }
3033                 *setup = template;
3034                 mutex_unlock(&pstr->oss.setup_mutex);
3035         }
3036 }
3037 
3038 static void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3039 {
3040         int stream;
3041         for (stream = 0; stream < 2; ++stream) {
3042                 struct snd_info_entry *entry;
3043                 struct snd_pcm_str *pstr = &pcm->streams[stream];
3044                 if (pstr->substream_count == 0)
3045                         continue;
3046                 if ((entry = snd_info_create_card_entry(pcm->card, "oss", pstr->proc_root)) != NULL) {
3047                         entry->content = SNDRV_INFO_CONTENT_TEXT;
3048                         entry->mode = S_IFREG | S_IRUGO | S_IWUSR;
3049                         entry->c.text.read = snd_pcm_oss_proc_read;
3050                         entry->c.text.write = snd_pcm_oss_proc_write;
3051                         entry->private_data = pstr;
3052                         if (snd_info_register(entry) < 0) {
3053                                 snd_info_free_entry(entry);
3054                                 entry = NULL;
3055                         }
3056                 }
3057                 pstr->oss.proc_entry = entry;
3058         }
3059 }
3060 
3061 static void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3062 {
3063         int stream;
3064         for (stream = 0; stream < 2; ++stream) {
3065                 struct snd_pcm_str *pstr = &pcm->streams[stream];
3066                 snd_info_free_entry(pstr->oss.proc_entry);
3067                 pstr->oss.proc_entry = NULL;
3068                 snd_pcm_oss_proc_free_setup_list(pstr);
3069         }
3070 }
3071 #else /* !CONFIG_SND_VERBOSE_PROCFS */
3072 #define snd_pcm_oss_proc_init(pcm)
3073 #define snd_pcm_oss_proc_done(pcm)
3074 #endif /* CONFIG_SND_VERBOSE_PROCFS */
3075 
3076 /*
3077  *  ENTRY functions
3078  */
3079 
3080 static const struct file_operations snd_pcm_oss_f_reg =
3081 {
3082         .owner =        THIS_MODULE,
3083         .read =         snd_pcm_oss_read,
3084         .write =        snd_pcm_oss_write,
3085         .open =         snd_pcm_oss_open,
3086         .release =      snd_pcm_oss_release,
3087         .llseek =       no_llseek,
3088         .poll =         snd_pcm_oss_poll,
3089         .unlocked_ioctl =       snd_pcm_oss_ioctl,
3090         .compat_ioctl = snd_pcm_oss_ioctl_compat,
3091         .mmap =         snd_pcm_oss_mmap,
3092 };
3093 
3094 static void register_oss_dsp(struct snd_pcm *pcm, int index)
3095 {
3096         if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3097                                     pcm->card, index, &snd_pcm_oss_f_reg,
3098                                     pcm) < 0) {
3099                 pcm_err(pcm, "unable to register OSS PCM device %i:%i\n",
3100                            pcm->card->number, pcm->device);
3101         }
3102 }
3103 
3104 static int snd_pcm_oss_register_minor(struct snd_pcm *pcm)
3105 {
3106         pcm->oss.reg = 0;
3107         if (dsp_map[pcm->card->number] == (int)pcm->device) {
3108                 char name[128];
3109                 int duplex;
3110                 register_oss_dsp(pcm, 0);
3111                 duplex = (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count > 0 && 
3112                               pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count && 
3113                               !(pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX));
3114                 sprintf(name, "%s%s", pcm->name, duplex ? " (DUPLEX)" : "");
3115 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3116                 snd_oss_info_register(SNDRV_OSS_INFO_DEV_AUDIO,
3117                                       pcm->card->number,
3118                                       name);
3119 #endif
3120                 pcm->oss.reg++;
3121                 pcm->oss.reg_mask |= 1;
3122         }
3123         if (adsp_map[pcm->card->number] == (int)pcm->device) {
3124                 register_oss_dsp(pcm, 1);
3125                 pcm->oss.reg++;
3126                 pcm->oss.reg_mask |= 2;
3127         }
3128 
3129         if (pcm->oss.reg)
3130                 snd_pcm_oss_proc_init(pcm);
3131 
3132         return 0;
3133 }
3134 
3135 static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm)
3136 {
3137         if (pcm->oss.reg) {
3138                 if (pcm->oss.reg_mask & 1) {
3139                         pcm->oss.reg_mask &= ~1;
3140                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3141                                                   pcm->card, 0);
3142                 }
3143                 if (pcm->oss.reg_mask & 2) {
3144                         pcm->oss.reg_mask &= ~2;
3145                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3146                                                   pcm->card, 1);
3147                 }
3148                 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3149 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3150                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number);
3151 #endif
3152                 }
3153                 pcm->oss.reg = 0;
3154         }
3155         return 0;
3156 }
3157 
3158 static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm)
3159 {
3160         snd_pcm_oss_disconnect_minor(pcm);
3161         snd_pcm_oss_proc_done(pcm);
3162         return 0;
3163 }
3164 
3165 static struct snd_pcm_notify snd_pcm_oss_notify =
3166 {
3167         .n_register =   snd_pcm_oss_register_minor,
3168         .n_disconnect = snd_pcm_oss_disconnect_minor,
3169         .n_unregister = snd_pcm_oss_unregister_minor,
3170 };
3171 
3172 static int __init alsa_pcm_oss_init(void)
3173 {
3174         int i;
3175         int err;
3176 
3177         /* check device map table */
3178         for (i = 0; i < SNDRV_CARDS; i++) {
3179                 if (dsp_map[i] < 0 || dsp_map[i] >= SNDRV_PCM_DEVICES) {
3180                         pr_err("ALSA: pcm_oss: invalid dsp_map[%d] = %d\n",
3181                                    i, dsp_map[i]);
3182                         dsp_map[i] = 0;
3183                 }
3184                 if (adsp_map[i] < 0 || adsp_map[i] >= SNDRV_PCM_DEVICES) {
3185                         pr_err("ALSA: pcm_oss: invalid adsp_map[%d] = %d\n",
3186                                    i, adsp_map[i]);
3187                         adsp_map[i] = 1;
3188                 }
3189         }
3190         if ((err = snd_pcm_notify(&snd_pcm_oss_notify, 0)) < 0)
3191                 return err;
3192         return 0;
3193 }
3194 
3195 static void __exit alsa_pcm_oss_exit(void)
3196 {
3197         snd_pcm_notify(&snd_pcm_oss_notify, 1);
3198 }
3199 
3200 module_init(alsa_pcm_oss_init)
3201 module_exit(alsa_pcm_oss_exit)
3202 

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