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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 static inline mm_segment_t snd_enter_user(void)
 71 {
 72         mm_segment_t fs = get_fs();
 73         set_fs(get_ds());
 74         return fs;
 75 }
 76 
 77 static inline void snd_leave_user(mm_segment_t fs)
 78 {
 79         set_fs(fs);
 80 }
 81 
 82 /*
 83  * helper functions to process hw_params
 84  */
 85 static int snd_interval_refine_min(struct snd_interval *i, unsigned int min, int openmin)
 86 {
 87         int changed = 0;
 88         if (i->min < min) {
 89                 i->min = min;
 90                 i->openmin = openmin;
 91                 changed = 1;
 92         } else if (i->min == min && !i->openmin && openmin) {
 93                 i->openmin = 1;
 94                 changed = 1;
 95         }
 96         if (i->integer) {
 97                 if (i->openmin) {
 98                         i->min++;
 99                         i->openmin = 0;
100                 }
101         }
102         if (snd_interval_checkempty(i)) {
103                 snd_interval_none(i);
104                 return -EINVAL;
105         }
106         return changed;
107 }
108 
109 static int snd_interval_refine_max(struct snd_interval *i, unsigned int max, int openmax)
110 {
111         int changed = 0;
112         if (i->max > max) {
113                 i->max = max;
114                 i->openmax = openmax;
115                 changed = 1;
116         } else if (i->max == max && !i->openmax && openmax) {
117                 i->openmax = 1;
118                 changed = 1;
119         }
120         if (i->integer) {
121                 if (i->openmax) {
122                         i->max--;
123                         i->openmax = 0;
124                 }
125         }
126         if (snd_interval_checkempty(i)) {
127                 snd_interval_none(i);
128                 return -EINVAL;
129         }
130         return changed;
131 }
132 
133 static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
134 {
135         struct snd_interval t;
136         t.empty = 0;
137         t.min = t.max = val;
138         t.openmin = t.openmax = 0;
139         t.integer = 1;
140         return snd_interval_refine(i, &t);
141 }
142 
143 /**
144  * snd_pcm_hw_param_value_min
145  * @params: the hw_params instance
146  * @var: parameter to retrieve
147  * @dir: pointer to the direction (-1,0,1) or NULL
148  *
149  * Return the minimum value for field PAR.
150  */
151 static unsigned int
152 snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params *params,
153                            snd_pcm_hw_param_t var, int *dir)
154 {
155         if (hw_is_mask(var)) {
156                 if (dir)
157                         *dir = 0;
158                 return snd_mask_min(hw_param_mask_c(params, var));
159         }
160         if (hw_is_interval(var)) {
161                 const struct snd_interval *i = hw_param_interval_c(params, var);
162                 if (dir)
163                         *dir = i->openmin;
164                 return snd_interval_min(i);
165         }
166         return -EINVAL;
167 }
168 
169 /**
170  * snd_pcm_hw_param_value_max
171  * @params: the hw_params instance
172  * @var: parameter to retrieve
173  * @dir: pointer to the direction (-1,0,1) or NULL
174  *
175  * Return the maximum value for field PAR.
176  */
177 static unsigned int
178 snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params *params,
179                            snd_pcm_hw_param_t var, int *dir)
180 {
181         if (hw_is_mask(var)) {
182                 if (dir)
183                         *dir = 0;
184                 return snd_mask_max(hw_param_mask_c(params, var));
185         }
186         if (hw_is_interval(var)) {
187                 const struct snd_interval *i = hw_param_interval_c(params, var);
188                 if (dir)
189                         *dir = - (int) i->openmax;
190                 return snd_interval_max(i);
191         }
192         return -EINVAL;
193 }
194 
195 static int _snd_pcm_hw_param_mask(struct snd_pcm_hw_params *params,
196                                   snd_pcm_hw_param_t var,
197                                   const struct snd_mask *val)
198 {
199         int changed;
200         changed = snd_mask_refine(hw_param_mask(params, var), val);
201         if (changed) {
202                 params->cmask |= 1 << var;
203                 params->rmask |= 1 << var;
204         }
205         return changed;
206 }
207 
208 static int snd_pcm_hw_param_mask(struct snd_pcm_substream *pcm,
209                                  struct snd_pcm_hw_params *params,
210                                  snd_pcm_hw_param_t var,
211                                  const struct snd_mask *val)
212 {
213         int changed = _snd_pcm_hw_param_mask(params, var, val);
214         if (changed < 0)
215                 return changed;
216         if (params->rmask) {
217                 int err = snd_pcm_hw_refine(pcm, params);
218                 if (err < 0)
219                         return err;
220         }
221         return 0;
222 }
223 
224 static int _snd_pcm_hw_param_min(struct snd_pcm_hw_params *params,
225                                  snd_pcm_hw_param_t var, unsigned int val,
226                                  int dir)
227 {
228         int changed;
229         int open = 0;
230         if (dir) {
231                 if (dir > 0) {
232                         open = 1;
233                 } else if (dir < 0) {
234                         if (val > 0) {
235                                 open = 1;
236                                 val--;
237                         }
238                 }
239         }
240         if (hw_is_mask(var))
241                 changed = snd_mask_refine_min(hw_param_mask(params, var),
242                                               val + !!open);
243         else if (hw_is_interval(var))
244                 changed = snd_interval_refine_min(hw_param_interval(params, var),
245                                                   val, open);
246         else
247                 return -EINVAL;
248         if (changed) {
249                 params->cmask |= 1 << var;
250                 params->rmask |= 1 << var;
251         }
252         return changed;
253 }
254 
255 /**
256  * snd_pcm_hw_param_min
257  * @pcm: PCM instance
258  * @params: the hw_params instance
259  * @var: parameter to retrieve
260  * @val: minimal value
261  * @dir: pointer to the direction (-1,0,1) or NULL
262  *
263  * Inside configuration space defined by PARAMS remove from PAR all 
264  * values < VAL. Reduce configuration space accordingly.
265  * Return new minimum or -EINVAL if the configuration space is empty
266  */
267 static int snd_pcm_hw_param_min(struct snd_pcm_substream *pcm,
268                                 struct snd_pcm_hw_params *params,
269                                 snd_pcm_hw_param_t var, unsigned int val,
270                                 int *dir)
271 {
272         int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
273         if (changed < 0)
274                 return changed;
275         if (params->rmask) {
276                 int err = snd_pcm_hw_refine(pcm, params);
277                 if (err < 0)
278                         return err;
279         }
280         return snd_pcm_hw_param_value_min(params, var, dir);
281 }
282 
283 static int _snd_pcm_hw_param_max(struct snd_pcm_hw_params *params,
284                                  snd_pcm_hw_param_t var, unsigned int val,
285                                  int dir)
286 {
287         int changed;
288         int open = 0;
289         if (dir) {
290                 if (dir < 0) {
291                         open = 1;
292                 } else if (dir > 0) {
293                         open = 1;
294                         val++;
295                 }
296         }
297         if (hw_is_mask(var)) {
298                 if (val == 0 && open) {
299                         snd_mask_none(hw_param_mask(params, var));
300                         changed = -EINVAL;
301                 } else
302                         changed = snd_mask_refine_max(hw_param_mask(params, var),
303                                                       val - !!open);
304         } else if (hw_is_interval(var))
305                 changed = snd_interval_refine_max(hw_param_interval(params, var),
306                                                   val, open);
307         else
308                 return -EINVAL;
309         if (changed) {
310                 params->cmask |= 1 << var;
311                 params->rmask |= 1 << var;
312         }
313         return changed;
314 }
315 
316 /**
317  * snd_pcm_hw_param_max
318  * @pcm: PCM instance
319  * @params: the hw_params instance
320  * @var: parameter to retrieve
321  * @val: maximal value
322  * @dir: pointer to the direction (-1,0,1) or NULL
323  *
324  * Inside configuration space defined by PARAMS remove from PAR all 
325  *  values >= VAL + 1. Reduce configuration space accordingly.
326  *  Return new maximum or -EINVAL if the configuration space is empty
327  */
328 static int snd_pcm_hw_param_max(struct snd_pcm_substream *pcm,
329                                 struct snd_pcm_hw_params *params,
330                                 snd_pcm_hw_param_t var, unsigned int val,
331                                 int *dir)
332 {
333         int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
334         if (changed < 0)
335                 return changed;
336         if (params->rmask) {
337                 int err = snd_pcm_hw_refine(pcm, params);
338                 if (err < 0)
339                         return err;
340         }
341         return snd_pcm_hw_param_value_max(params, var, dir);
342 }
343 
344 static int boundary_sub(int a, int adir,
345                         int b, int bdir,
346                         int *c, int *cdir)
347 {
348         adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
349         bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
350         *c = a - b;
351         *cdir = adir - bdir;
352         if (*cdir == -2) {
353                 (*c)--;
354         } else if (*cdir == 2) {
355                 (*c)++;
356         }
357         return 0;
358 }
359 
360 static int boundary_lt(unsigned int a, int adir,
361                        unsigned int b, int bdir)
362 {
363         if (adir < 0) {
364                 a--;
365                 adir = 1;
366         } else if (adir > 0)
367                 adir = 1;
368         if (bdir < 0) {
369                 b--;
370                 bdir = 1;
371         } else if (bdir > 0)
372                 bdir = 1;
373         return a < b || (a == b && adir < bdir);
374 }
375 
376 /* Return 1 if min is nearer to best than max */
377 static int boundary_nearer(int min, int mindir,
378                            int best, int bestdir,
379                            int max, int maxdir)
380 {
381         int dmin, dmindir;
382         int dmax, dmaxdir;
383         boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
384         boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
385         return boundary_lt(dmin, dmindir, dmax, dmaxdir);
386 }
387 
388 /**
389  * snd_pcm_hw_param_near
390  * @pcm: PCM instance
391  * @params: the hw_params instance
392  * @var: parameter to retrieve
393  * @best: value to set
394  * @dir: pointer to the direction (-1,0,1) or NULL
395  *
396  * Inside configuration space defined by PARAMS set PAR to the available value
397  * nearest to VAL. Reduce configuration space accordingly.
398  * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
399  * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
400  * Return the value found.
401   */
402 static int snd_pcm_hw_param_near(struct snd_pcm_substream *pcm,
403                                  struct snd_pcm_hw_params *params,
404                                  snd_pcm_hw_param_t var, unsigned int best,
405                                  int *dir)
406 {
407         struct snd_pcm_hw_params *save = NULL;
408         int v;
409         unsigned int saved_min;
410         int last = 0;
411         int min, max;
412         int mindir, maxdir;
413         int valdir = dir ? *dir : 0;
414         /* FIXME */
415         if (best > INT_MAX)
416                 best = INT_MAX;
417         min = max = best;
418         mindir = maxdir = valdir;
419         if (maxdir > 0)
420                 maxdir = 0;
421         else if (maxdir == 0)
422                 maxdir = -1;
423         else {
424                 maxdir = 1;
425                 max--;
426         }
427         save = kmalloc(sizeof(*save), GFP_KERNEL);
428         if (save == NULL)
429                 return -ENOMEM;
430         *save = *params;
431         saved_min = min;
432         min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
433         if (min >= 0) {
434                 struct snd_pcm_hw_params *params1;
435                 if (max < 0)
436                         goto _end;
437                 if ((unsigned int)min == saved_min && mindir == valdir)
438                         goto _end;
439                 params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
440                 if (params1 == NULL) {
441                         kfree(save);
442                         return -ENOMEM;
443                 }
444                 *params1 = *save;
445                 max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
446                 if (max < 0) {
447                         kfree(params1);
448                         goto _end;
449                 }
450                 if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
451                         *params = *params1;
452                         last = 1;
453                 }
454                 kfree(params1);
455         } else {
456                 *params = *save;
457                 max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
458                 if (max < 0) {
459                         kfree(save);
460                         return max;
461                 }
462                 last = 1;
463         }
464  _end:
465         kfree(save);
466         if (last)
467                 v = snd_pcm_hw_param_last(pcm, params, var, dir);
468         else
469                 v = snd_pcm_hw_param_first(pcm, params, var, dir);
470         snd_BUG_ON(v < 0);
471         return v;
472 }
473 
474 static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
475                                  snd_pcm_hw_param_t var, unsigned int val,
476                                  int dir)
477 {
478         int changed;
479         if (hw_is_mask(var)) {
480                 struct snd_mask *m = hw_param_mask(params, var);
481                 if (val == 0 && dir < 0) {
482                         changed = -EINVAL;
483                         snd_mask_none(m);
484                 } else {
485                         if (dir > 0)
486                                 val++;
487                         else if (dir < 0)
488                                 val--;
489                         changed = snd_mask_refine_set(hw_param_mask(params, var), val);
490                 }
491         } else if (hw_is_interval(var)) {
492                 struct snd_interval *i = hw_param_interval(params, var);
493                 if (val == 0 && dir < 0) {
494                         changed = -EINVAL;
495                         snd_interval_none(i);
496                 } else if (dir == 0)
497                         changed = snd_interval_refine_set(i, val);
498                 else {
499                         struct snd_interval t;
500                         t.openmin = 1;
501                         t.openmax = 1;
502                         t.empty = 0;
503                         t.integer = 0;
504                         if (dir < 0) {
505                                 t.min = val - 1;
506                                 t.max = val;
507                         } else {
508                                 t.min = val;
509                                 t.max = val+1;
510                         }
511                         changed = snd_interval_refine(i, &t);
512                 }
513         } else
514                 return -EINVAL;
515         if (changed) {
516                 params->cmask |= 1 << var;
517                 params->rmask |= 1 << var;
518         }
519         return changed;
520 }
521 
522 /**
523  * snd_pcm_hw_param_set
524  * @pcm: PCM instance
525  * @params: the hw_params instance
526  * @var: parameter to retrieve
527  * @val: value to set
528  * @dir: pointer to the direction (-1,0,1) or NULL
529  *
530  * Inside configuration space defined by PARAMS remove from PAR all 
531  * values != VAL. Reduce configuration space accordingly.
532  *  Return VAL or -EINVAL if the configuration space is empty
533  */
534 static int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm,
535                                 struct snd_pcm_hw_params *params,
536                                 snd_pcm_hw_param_t var, unsigned int val,
537                                 int dir)
538 {
539         int changed = _snd_pcm_hw_param_set(params, var, val, dir);
540         if (changed < 0)
541                 return changed;
542         if (params->rmask) {
543                 int err = snd_pcm_hw_refine(pcm, params);
544                 if (err < 0)
545                         return err;
546         }
547         return snd_pcm_hw_param_value(params, var, NULL);
548 }
549 
550 static int _snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params *params,
551                                         snd_pcm_hw_param_t var)
552 {
553         int changed;
554         changed = snd_interval_setinteger(hw_param_interval(params, var));
555         if (changed) {
556                 params->cmask |= 1 << var;
557                 params->rmask |= 1 << var;
558         }
559         return changed;
560 }
561         
562 /*
563  * plugin
564  */
565 
566 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
567 static int snd_pcm_oss_plugin_clear(struct snd_pcm_substream *substream)
568 {
569         struct snd_pcm_runtime *runtime = substream->runtime;
570         struct snd_pcm_plugin *plugin, *next;
571         
572         plugin = runtime->oss.plugin_first;
573         while (plugin) {
574                 next = plugin->next;
575                 snd_pcm_plugin_free(plugin);
576                 plugin = next;
577         }
578         runtime->oss.plugin_first = runtime->oss.plugin_last = NULL;
579         return 0;
580 }
581 
582 static int snd_pcm_plugin_insert(struct snd_pcm_plugin *plugin)
583 {
584         struct snd_pcm_runtime *runtime = plugin->plug->runtime;
585         plugin->next = runtime->oss.plugin_first;
586         plugin->prev = NULL;
587         if (runtime->oss.plugin_first) {
588                 runtime->oss.plugin_first->prev = plugin;
589                 runtime->oss.plugin_first = plugin;
590         } else {
591                 runtime->oss.plugin_last =
592                 runtime->oss.plugin_first = plugin;
593         }
594         return 0;
595 }
596 
597 int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin)
598 {
599         struct snd_pcm_runtime *runtime = plugin->plug->runtime;
600         plugin->next = NULL;
601         plugin->prev = runtime->oss.plugin_last;
602         if (runtime->oss.plugin_last) {
603                 runtime->oss.plugin_last->next = plugin;
604                 runtime->oss.plugin_last = plugin;
605         } else {
606                 runtime->oss.plugin_last =
607                 runtime->oss.plugin_first = plugin;
608         }
609         return 0;
610 }
611 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
612 
613 static long snd_pcm_oss_bytes(struct snd_pcm_substream *substream, long frames)
614 {
615         struct snd_pcm_runtime *runtime = substream->runtime;
616         long buffer_size = snd_pcm_lib_buffer_bytes(substream);
617         long bytes = frames_to_bytes(runtime, frames);
618         if (buffer_size == runtime->oss.buffer_bytes)
619                 return bytes;
620 #if BITS_PER_LONG >= 64
621         return runtime->oss.buffer_bytes * bytes / buffer_size;
622 #else
623         {
624                 u64 bsize = (u64)runtime->oss.buffer_bytes * (u64)bytes;
625                 return div_u64(bsize, buffer_size);
626         }
627 #endif
628 }
629 
630 static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes)
631 {
632         struct snd_pcm_runtime *runtime = substream->runtime;
633         long buffer_size = snd_pcm_lib_buffer_bytes(substream);
634         if (buffer_size == runtime->oss.buffer_bytes)
635                 return bytes_to_frames(runtime, bytes);
636         return bytes_to_frames(runtime, (buffer_size * bytes) / runtime->oss.buffer_bytes);
637 }
638 
639 static inline
640 snd_pcm_uframes_t get_hw_ptr_period(struct snd_pcm_runtime *runtime)
641 {
642         return runtime->hw_ptr_interrupt;
643 }
644 
645 /* define extended formats in the recent OSS versions (if any) */
646 /* linear formats */
647 #define AFMT_S32_LE      0x00001000
648 #define AFMT_S32_BE      0x00002000
649 #define AFMT_S24_LE      0x00008000
650 #define AFMT_S24_BE      0x00010000
651 #define AFMT_S24_PACKED  0x00040000
652 
653 /* other supported formats */
654 #define AFMT_FLOAT       0x00004000
655 #define AFMT_SPDIF_RAW   0x00020000
656 
657 /* unsupported formats */
658 #define AFMT_AC3         0x00000400
659 #define AFMT_VORBIS      0x00000800
660 
661 static snd_pcm_format_t snd_pcm_oss_format_from(int format)
662 {
663         switch (format) {
664         case AFMT_MU_LAW:       return SNDRV_PCM_FORMAT_MU_LAW;
665         case AFMT_A_LAW:        return SNDRV_PCM_FORMAT_A_LAW;
666         case AFMT_IMA_ADPCM:    return SNDRV_PCM_FORMAT_IMA_ADPCM;
667         case AFMT_U8:           return SNDRV_PCM_FORMAT_U8;
668         case AFMT_S16_LE:       return SNDRV_PCM_FORMAT_S16_LE;
669         case AFMT_S16_BE:       return SNDRV_PCM_FORMAT_S16_BE;
670         case AFMT_S8:           return SNDRV_PCM_FORMAT_S8;
671         case AFMT_U16_LE:       return SNDRV_PCM_FORMAT_U16_LE;
672         case AFMT_U16_BE:       return SNDRV_PCM_FORMAT_U16_BE;
673         case AFMT_MPEG:         return SNDRV_PCM_FORMAT_MPEG;
674         case AFMT_S32_LE:       return SNDRV_PCM_FORMAT_S32_LE;
675         case AFMT_S32_BE:       return SNDRV_PCM_FORMAT_S32_BE;
676         case AFMT_S24_LE:       return SNDRV_PCM_FORMAT_S24_LE;
677         case AFMT_S24_BE:       return SNDRV_PCM_FORMAT_S24_BE;
678         case AFMT_S24_PACKED:   return SNDRV_PCM_FORMAT_S24_3LE;
679         case AFMT_FLOAT:        return SNDRV_PCM_FORMAT_FLOAT;
680         case AFMT_SPDIF_RAW:    return SNDRV_PCM_FORMAT_IEC958_SUBFRAME;
681         default:                return SNDRV_PCM_FORMAT_U8;
682         }
683 }
684 
685 static int snd_pcm_oss_format_to(snd_pcm_format_t format)
686 {
687         switch (format) {
688         case SNDRV_PCM_FORMAT_MU_LAW:   return AFMT_MU_LAW;
689         case SNDRV_PCM_FORMAT_A_LAW:    return AFMT_A_LAW;
690         case SNDRV_PCM_FORMAT_IMA_ADPCM:        return AFMT_IMA_ADPCM;
691         case SNDRV_PCM_FORMAT_U8:               return AFMT_U8;
692         case SNDRV_PCM_FORMAT_S16_LE:   return AFMT_S16_LE;
693         case SNDRV_PCM_FORMAT_S16_BE:   return AFMT_S16_BE;
694         case SNDRV_PCM_FORMAT_S8:               return AFMT_S8;
695         case SNDRV_PCM_FORMAT_U16_LE:   return AFMT_U16_LE;
696         case SNDRV_PCM_FORMAT_U16_BE:   return AFMT_U16_BE;
697         case SNDRV_PCM_FORMAT_MPEG:             return AFMT_MPEG;
698         case SNDRV_PCM_FORMAT_S32_LE:   return AFMT_S32_LE;
699         case SNDRV_PCM_FORMAT_S32_BE:   return AFMT_S32_BE;
700         case SNDRV_PCM_FORMAT_S24_LE:   return AFMT_S24_LE;
701         case SNDRV_PCM_FORMAT_S24_BE:   return AFMT_S24_BE;
702         case SNDRV_PCM_FORMAT_S24_3LE:  return AFMT_S24_PACKED;
703         case SNDRV_PCM_FORMAT_FLOAT:    return AFMT_FLOAT;
704         case SNDRV_PCM_FORMAT_IEC958_SUBFRAME: return AFMT_SPDIF_RAW;
705         default:                        return -EINVAL;
706         }
707 }
708 
709 static int snd_pcm_oss_period_size(struct snd_pcm_substream *substream, 
710                                    struct snd_pcm_hw_params *oss_params,
711                                    struct snd_pcm_hw_params *slave_params)
712 {
713         size_t s;
714         size_t oss_buffer_size, oss_period_size, oss_periods;
715         size_t min_period_size, max_period_size;
716         struct snd_pcm_runtime *runtime = substream->runtime;
717         size_t oss_frame_size;
718 
719         oss_frame_size = snd_pcm_format_physical_width(params_format(oss_params)) *
720                          params_channels(oss_params) / 8;
721 
722         oss_buffer_size = snd_pcm_plug_client_size(substream,
723                                                    snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, NULL)) * oss_frame_size;
724         oss_buffer_size = rounddown_pow_of_two(oss_buffer_size);
725         if (atomic_read(&substream->mmap_count)) {
726                 if (oss_buffer_size > runtime->oss.mmap_bytes)
727                         oss_buffer_size = runtime->oss.mmap_bytes;
728         }
729 
730         if (substream->oss.setup.period_size > 16)
731                 oss_period_size = substream->oss.setup.period_size;
732         else if (runtime->oss.fragshift) {
733                 oss_period_size = 1 << runtime->oss.fragshift;
734                 if (oss_period_size > oss_buffer_size / 2)
735                         oss_period_size = oss_buffer_size / 2;
736         } else {
737                 int sd;
738                 size_t bytes_per_sec = params_rate(oss_params) * snd_pcm_format_physical_width(params_format(oss_params)) * params_channels(oss_params) / 8;
739 
740                 oss_period_size = oss_buffer_size;
741                 do {
742                         oss_period_size /= 2;
743                 } while (oss_period_size > bytes_per_sec);
744                 if (runtime->oss.subdivision == 0) {
745                         sd = 4;
746                         if (oss_period_size / sd > 4096)
747                                 sd *= 2;
748                         if (oss_period_size / sd < 4096)
749                                 sd = 1;
750                 } else
751                         sd = runtime->oss.subdivision;
752                 oss_period_size /= sd;
753                 if (oss_period_size < 16)
754                         oss_period_size = 16;
755         }
756 
757         min_period_size = snd_pcm_plug_client_size(substream,
758                                                    snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
759         min_period_size *= oss_frame_size;
760         min_period_size = roundup_pow_of_two(min_period_size);
761         if (oss_period_size < min_period_size)
762                 oss_period_size = min_period_size;
763 
764         max_period_size = snd_pcm_plug_client_size(substream,
765                                                    snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
766         max_period_size *= oss_frame_size;
767         max_period_size = rounddown_pow_of_two(max_period_size);
768         if (oss_period_size > max_period_size)
769                 oss_period_size = max_period_size;
770 
771         oss_periods = oss_buffer_size / oss_period_size;
772 
773         if (substream->oss.setup.periods > 1)
774                 oss_periods = substream->oss.setup.periods;
775 
776         s = snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
777         if (runtime->oss.maxfrags && s > runtime->oss.maxfrags)
778                 s = runtime->oss.maxfrags;
779         if (oss_periods > s)
780                 oss_periods = s;
781 
782         s = snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
783         if (s < 2)
784                 s = 2;
785         if (oss_periods < s)
786                 oss_periods = s;
787 
788         while (oss_period_size * oss_periods > oss_buffer_size)
789                 oss_period_size /= 2;
790 
791         if (oss_period_size < 16)
792                 return -EINVAL;
793         runtime->oss.period_bytes = oss_period_size;
794         runtime->oss.period_frames = 1;
795         runtime->oss.periods = oss_periods;
796         return 0;
797 }
798 
799 static int choose_rate(struct snd_pcm_substream *substream,
800                        struct snd_pcm_hw_params *params, unsigned int best_rate)
801 {
802         struct snd_interval *it;
803         struct snd_pcm_hw_params *save;
804         unsigned int rate, prev;
805 
806         save = kmalloc(sizeof(*save), GFP_KERNEL);
807         if (save == NULL)
808                 return -ENOMEM;
809         *save = *params;
810         it = hw_param_interval(save, SNDRV_PCM_HW_PARAM_RATE);
811 
812         /* try multiples of the best rate */
813         rate = best_rate;
814         for (;;) {
815                 if (it->max < rate || (it->max == rate && it->openmax))
816                         break;
817                 if (it->min < rate || (it->min == rate && !it->openmin)) {
818                         int ret;
819                         ret = snd_pcm_hw_param_set(substream, params,
820                                                    SNDRV_PCM_HW_PARAM_RATE,
821                                                    rate, 0);
822                         if (ret == (int)rate) {
823                                 kfree(save);
824                                 return rate;
825                         }
826                         *params = *save;
827                 }
828                 prev = rate;
829                 rate += best_rate;
830                 if (rate <= prev)
831                         break;
832         }
833 
834         /* not found, use the nearest rate */
835         kfree(save);
836         return snd_pcm_hw_param_near(substream, params, SNDRV_PCM_HW_PARAM_RATE, best_rate, NULL);
837 }
838 
839 static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
840                                      bool trylock)
841 {
842         struct snd_pcm_runtime *runtime = substream->runtime;
843         struct snd_pcm_hw_params *params, *sparams;
844         struct snd_pcm_sw_params *sw_params;
845         ssize_t oss_buffer_size, oss_period_size;
846         size_t oss_frame_size;
847         int err;
848         int direct;
849         snd_pcm_format_t format, sformat;
850         int n;
851         struct snd_mask sformat_mask;
852         struct snd_mask mask;
853 
854         if (trylock) {
855                 if (!(mutex_trylock(&runtime->oss.params_lock)))
856                         return -EAGAIN;
857         } else if (mutex_lock_interruptible(&runtime->oss.params_lock))
858                 return -EINTR;
859         sw_params = kzalloc(sizeof(*sw_params), GFP_KERNEL);
860         params = kmalloc(sizeof(*params), GFP_KERNEL);
861         sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
862         if (!sw_params || !params || !sparams) {
863                 err = -ENOMEM;
864                 goto failure;
865         }
866 
867         if (atomic_read(&substream->mmap_count))
868                 direct = 1;
869         else
870                 direct = substream->oss.setup.direct;
871 
872         _snd_pcm_hw_params_any(sparams);
873         _snd_pcm_hw_param_setinteger(sparams, SNDRV_PCM_HW_PARAM_PERIODS);
874         _snd_pcm_hw_param_min(sparams, SNDRV_PCM_HW_PARAM_PERIODS, 2, 0);
875         snd_mask_none(&mask);
876         if (atomic_read(&substream->mmap_count))
877                 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
878         else {
879                 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED);
880                 if (!direct)
881                         snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
882         }
883         err = snd_pcm_hw_param_mask(substream, sparams, SNDRV_PCM_HW_PARAM_ACCESS, &mask);
884         if (err < 0) {
885                 pcm_dbg(substream->pcm, "No usable accesses\n");
886                 err = -EINVAL;
887                 goto failure;
888         }
889         choose_rate(substream, sparams, runtime->oss.rate);
890         snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_CHANNELS, runtime->oss.channels, NULL);
891 
892         format = snd_pcm_oss_format_from(runtime->oss.format);
893 
894         sformat_mask = *hw_param_mask(sparams, SNDRV_PCM_HW_PARAM_FORMAT);
895         if (direct)
896                 sformat = format;
897         else
898                 sformat = snd_pcm_plug_slave_format(format, &sformat_mask);
899 
900         if ((__force int)sformat < 0 ||
901             !snd_mask_test(&sformat_mask, (__force int)sformat)) {
902                 for (sformat = (__force snd_pcm_format_t)0;
903                      (__force int)sformat <= (__force int)SNDRV_PCM_FORMAT_LAST;
904                      sformat = (__force snd_pcm_format_t)((__force int)sformat + 1)) {
905                         if (snd_mask_test(&sformat_mask, (__force int)sformat) &&
906                             snd_pcm_oss_format_to(sformat) >= 0)
907                                 break;
908                 }
909                 if ((__force int)sformat > (__force int)SNDRV_PCM_FORMAT_LAST) {
910                         pcm_dbg(substream->pcm, "Cannot find a format!!!\n");
911                         err = -EINVAL;
912                         goto failure;
913                 }
914         }
915         err = _snd_pcm_hw_param_set(sparams, SNDRV_PCM_HW_PARAM_FORMAT, (__force int)sformat, 0);
916         if (err < 0)
917                 goto failure;
918 
919         if (direct) {
920                 memcpy(params, sparams, sizeof(*params));
921         } else {
922                 _snd_pcm_hw_params_any(params);
923                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
924                                       (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED, 0);
925                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
926                                       (__force int)snd_pcm_oss_format_from(runtime->oss.format), 0);
927                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
928                                       runtime->oss.channels, 0);
929                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
930                                       runtime->oss.rate, 0);
931                 pdprintf("client: access = %i, format = %i, channels = %i, rate = %i\n",
932                          params_access(params), params_format(params),
933                          params_channels(params), params_rate(params));
934         }
935         pdprintf("slave: access = %i, format = %i, channels = %i, rate = %i\n",
936                  params_access(sparams), params_format(sparams),
937                  params_channels(sparams), params_rate(sparams));
938 
939         oss_frame_size = snd_pcm_format_physical_width(params_format(params)) *
940                          params_channels(params) / 8;
941 
942 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
943         snd_pcm_oss_plugin_clear(substream);
944         if (!direct) {
945                 /* add necessary plugins */
946                 snd_pcm_oss_plugin_clear(substream);
947                 if ((err = snd_pcm_plug_format_plugins(substream,
948                                                        params, 
949                                                        sparams)) < 0) {
950                         pcm_dbg(substream->pcm,
951                                 "snd_pcm_plug_format_plugins failed: %i\n", err);
952                         snd_pcm_oss_plugin_clear(substream);
953                         goto failure;
954                 }
955                 if (runtime->oss.plugin_first) {
956                         struct snd_pcm_plugin *plugin;
957                         if ((err = snd_pcm_plugin_build_io(substream, sparams, &plugin)) < 0) {
958                                 pcm_dbg(substream->pcm,
959                                         "snd_pcm_plugin_build_io failed: %i\n", err);
960                                 snd_pcm_oss_plugin_clear(substream);
961                                 goto failure;
962                         }
963                         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
964                                 err = snd_pcm_plugin_append(plugin);
965                         } else {
966                                 err = snd_pcm_plugin_insert(plugin);
967                         }
968                         if (err < 0) {
969                                 snd_pcm_oss_plugin_clear(substream);
970                                 goto failure;
971                         }
972                 }
973         }
974 #endif
975 
976         err = snd_pcm_oss_period_size(substream, params, sparams);
977         if (err < 0)
978                 goto failure;
979 
980         n = snd_pcm_plug_slave_size(substream, runtime->oss.period_bytes / oss_frame_size);
981         err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, n, NULL);
982         if (err < 0)
983                 goto failure;
984 
985         err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIODS,
986                                      runtime->oss.periods, NULL);
987         if (err < 0)
988                 goto failure;
989 
990         snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
991 
992         if ((err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, sparams)) < 0) {
993                 pcm_dbg(substream->pcm, "HW_PARAMS failed: %i\n", err);
994                 goto failure;
995         }
996 
997         if (runtime->oss.trigger) {
998                 sw_params->start_threshold = 1;
999         } else {
1000                 sw_params->start_threshold = runtime->boundary;
1001         }
1002         if (atomic_read(&substream->mmap_count) ||
1003             substream->stream == SNDRV_PCM_STREAM_CAPTURE)
1004                 sw_params->stop_threshold = runtime->boundary;
1005         else
1006                 sw_params->stop_threshold = runtime->buffer_size;
1007         sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
1008         sw_params->period_step = 1;
1009         sw_params->avail_min = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
1010                 1 : runtime->period_size;
1011         if (atomic_read(&substream->mmap_count) ||
1012             substream->oss.setup.nosilence) {
1013                 sw_params->silence_threshold = 0;
1014                 sw_params->silence_size = 0;
1015         } else {
1016                 snd_pcm_uframes_t frames;
1017                 frames = runtime->period_size + 16;
1018                 if (frames > runtime->buffer_size)
1019                         frames = runtime->buffer_size;
1020                 sw_params->silence_threshold = frames;
1021                 sw_params->silence_size = frames;
1022         }
1023 
1024         if ((err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_SW_PARAMS, sw_params)) < 0) {
1025                 pcm_dbg(substream->pcm, "SW_PARAMS failed: %i\n", err);
1026                 goto failure;
1027         }
1028 
1029         runtime->oss.periods = params_periods(sparams);
1030         oss_period_size = snd_pcm_plug_client_size(substream, params_period_size(sparams));
1031         if (oss_period_size < 0) {
1032                 err = -EINVAL;
1033                 goto failure;
1034         }
1035 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1036         if (runtime->oss.plugin_first) {
1037                 err = snd_pcm_plug_alloc(substream, oss_period_size);
1038                 if (err < 0)
1039                         goto failure;
1040         }
1041 #endif
1042         oss_period_size *= oss_frame_size;
1043 
1044         oss_buffer_size = oss_period_size * runtime->oss.periods;
1045         if (oss_buffer_size < 0) {
1046                 err = -EINVAL;
1047                 goto failure;
1048         }
1049 
1050         runtime->oss.period_bytes = oss_period_size;
1051         runtime->oss.buffer_bytes = oss_buffer_size;
1052 
1053         pdprintf("oss: period bytes = %i, buffer bytes = %i\n",
1054                  runtime->oss.period_bytes,
1055                  runtime->oss.buffer_bytes);
1056         pdprintf("slave: period_size = %i, buffer_size = %i\n",
1057                  params_period_size(sparams),
1058                  params_buffer_size(sparams));
1059 
1060         runtime->oss.format = snd_pcm_oss_format_to(params_format(params));
1061         runtime->oss.channels = params_channels(params);
1062         runtime->oss.rate = params_rate(params);
1063 
1064         vfree(runtime->oss.buffer);
1065         runtime->oss.buffer = vmalloc(runtime->oss.period_bytes);
1066         if (!runtime->oss.buffer) {
1067                 err = -ENOMEM;
1068                 goto failure;
1069         }
1070 
1071         runtime->oss.params = 0;
1072         runtime->oss.prepare = 1;
1073         runtime->oss.buffer_used = 0;
1074         if (runtime->dma_area)
1075                 snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes));
1076 
1077         runtime->oss.period_frames = snd_pcm_alsa_frames(substream, oss_period_size);
1078 
1079         err = 0;
1080 failure:
1081         kfree(sw_params);
1082         kfree(params);
1083         kfree(sparams);
1084         mutex_unlock(&runtime->oss.params_lock);
1085         return err;
1086 }
1087 
1088 static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream)
1089 {
1090         int idx, err;
1091         struct snd_pcm_substream *asubstream = NULL, *substream;
1092 
1093         for (idx = 0; idx < 2; idx++) {
1094                 substream = pcm_oss_file->streams[idx];
1095                 if (substream == NULL)
1096                         continue;
1097                 if (asubstream == NULL)
1098                         asubstream = substream;
1099                 if (substream->runtime->oss.params) {
1100                         err = snd_pcm_oss_change_params(substream, false);
1101                         if (err < 0)
1102                                 return err;
1103                 }
1104         }
1105         if (!asubstream)
1106                 return -EIO;
1107         if (r_substream)
1108                 *r_substream = asubstream;
1109         return 0;
1110 }
1111 
1112 static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
1113 {
1114         int err;
1115         struct snd_pcm_runtime *runtime = substream->runtime;
1116 
1117         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
1118         if (err < 0) {
1119                 pcm_dbg(substream->pcm,
1120                         "snd_pcm_oss_prepare: SNDRV_PCM_IOCTL_PREPARE failed\n");
1121                 return err;
1122         }
1123         runtime->oss.prepare = 0;
1124         runtime->oss.prev_hw_ptr_period = 0;
1125         runtime->oss.period_ptr = 0;
1126         runtime->oss.buffer_used = 0;
1127 
1128         return 0;
1129 }
1130 
1131 static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream)
1132 {
1133         struct snd_pcm_runtime *runtime;
1134         int err;
1135 
1136         if (substream == NULL)
1137                 return 0;
1138         runtime = substream->runtime;
1139         if (runtime->oss.params) {
1140                 err = snd_pcm_oss_change_params(substream, false);
1141                 if (err < 0)
1142                         return err;
1143         }
1144         if (runtime->oss.prepare) {
1145                 err = snd_pcm_oss_prepare(substream);
1146                 if (err < 0)
1147                         return err;
1148         }
1149         return 0;
1150 }
1151 
1152 static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay)
1153 {
1154         struct snd_pcm_runtime *runtime;
1155         snd_pcm_uframes_t frames;
1156         int err = 0;
1157 
1158         while (1) {
1159                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, delay);
1160                 if (err < 0)
1161                         break;
1162                 runtime = substream->runtime;
1163                 if (*delay <= (snd_pcm_sframes_t)runtime->buffer_size)
1164                         break;
1165                 /* in case of overrun, skip whole periods like OSS/Linux driver does */
1166                 /* until avail(delay) <= buffer_size */
1167                 frames = (*delay - runtime->buffer_size) + runtime->period_size - 1;
1168                 frames /= runtime->period_size;
1169                 frames *= runtime->period_size;
1170                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_FORWARD, &frames);
1171                 if (err < 0)
1172                         break;
1173         }
1174         return err;
1175 }
1176 
1177 snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1178 {
1179         struct snd_pcm_runtime *runtime = substream->runtime;
1180         int ret;
1181         while (1) {
1182                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1183                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1184 #ifdef OSS_DEBUG
1185                         pcm_dbg(substream->pcm,
1186                                 "pcm_oss: write: recovering from %s\n",
1187                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1188                                 "XRUN" : "SUSPEND");
1189 #endif
1190                         ret = snd_pcm_oss_prepare(substream);
1191                         if (ret < 0)
1192                                 break;
1193                 }
1194                 if (in_kernel) {
1195                         mm_segment_t fs;
1196                         fs = snd_enter_user();
1197                         ret = snd_pcm_lib_write(substream, (void __force __user *)ptr, frames);
1198                         snd_leave_user(fs);
1199                 } else {
1200                         ret = snd_pcm_lib_write(substream, (void __force __user *)ptr, frames);
1201                 }
1202                 if (ret != -EPIPE && ret != -ESTRPIPE)
1203                         break;
1204                 /* test, if we can't store new data, because the stream */
1205                 /* has not been started */
1206                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1207                         return -EAGAIN;
1208         }
1209         return ret;
1210 }
1211 
1212 snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1213 {
1214         struct snd_pcm_runtime *runtime = substream->runtime;
1215         snd_pcm_sframes_t delay;
1216         int ret;
1217         while (1) {
1218                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1219                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1220 #ifdef OSS_DEBUG
1221                         pcm_dbg(substream->pcm,
1222                                 "pcm_oss: read: recovering from %s\n",
1223                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1224                                 "XRUN" : "SUSPEND");
1225 #endif
1226                         ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1227                         if (ret < 0)
1228                                 break;
1229                 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1230                         ret = snd_pcm_oss_prepare(substream);
1231                         if (ret < 0)
1232                                 break;
1233                 }
1234                 ret = snd_pcm_oss_capture_position_fixup(substream, &delay);
1235                 if (ret < 0)
1236                         break;
1237                 if (in_kernel) {
1238                         mm_segment_t fs;
1239                         fs = snd_enter_user();
1240                         ret = snd_pcm_lib_read(substream, (void __force __user *)ptr, frames);
1241                         snd_leave_user(fs);
1242                 } else {
1243                         ret = snd_pcm_lib_read(substream, (void __force __user *)ptr, frames);
1244                 }
1245                 if (ret == -EPIPE) {
1246                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1247                                 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1248                                 if (ret < 0)
1249                                         break;
1250                         }
1251                         continue;
1252                 }
1253                 if (ret != -ESTRPIPE)
1254                         break;
1255         }
1256         return ret;
1257 }
1258 
1259 snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames, int in_kernel)
1260 {
1261         struct snd_pcm_runtime *runtime = substream->runtime;
1262         int ret;
1263         while (1) {
1264                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1265                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1266 #ifdef OSS_DEBUG
1267                         pcm_dbg(substream->pcm,
1268                                 "pcm_oss: writev: recovering from %s\n",
1269                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1270                                 "XRUN" : "SUSPEND");
1271 #endif
1272                         ret = snd_pcm_oss_prepare(substream);
1273                         if (ret < 0)
1274                                 break;
1275                 }
1276                 if (in_kernel) {
1277                         mm_segment_t fs;
1278                         fs = snd_enter_user();
1279                         ret = snd_pcm_lib_writev(substream, (void __user **)bufs, frames);
1280                         snd_leave_user(fs);
1281                 } else {
1282                         ret = snd_pcm_lib_writev(substream, (void __user **)bufs, frames);
1283                 }
1284                 if (ret != -EPIPE && ret != -ESTRPIPE)
1285                         break;
1286 
1287                 /* test, if we can't store new data, because the stream */
1288                 /* has not been started */
1289                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1290                         return -EAGAIN;
1291         }
1292         return ret;
1293 }
1294         
1295 snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames, int in_kernel)
1296 {
1297         struct snd_pcm_runtime *runtime = substream->runtime;
1298         int ret;
1299         while (1) {
1300                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1301                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1302 #ifdef OSS_DEBUG
1303                         pcm_dbg(substream->pcm,
1304                                 "pcm_oss: readv: recovering from %s\n",
1305                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1306                                 "XRUN" : "SUSPEND");
1307 #endif
1308                         ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1309                         if (ret < 0)
1310                                 break;
1311                 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1312                         ret = snd_pcm_oss_prepare(substream);
1313                         if (ret < 0)
1314                                 break;
1315                 }
1316                 if (in_kernel) {
1317                         mm_segment_t fs;
1318                         fs = snd_enter_user();
1319                         ret = snd_pcm_lib_readv(substream, (void __user **)bufs, frames);
1320                         snd_leave_user(fs);
1321                 } else {
1322                         ret = snd_pcm_lib_readv(substream, (void __user **)bufs, frames);
1323                 }
1324                 if (ret != -EPIPE && ret != -ESTRPIPE)
1325                         break;
1326         }
1327         return ret;
1328 }
1329 
1330 static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel)
1331 {
1332         struct snd_pcm_runtime *runtime = substream->runtime;
1333         snd_pcm_sframes_t frames, frames1;
1334 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1335         if (runtime->oss.plugin_first) {
1336                 struct snd_pcm_plugin_channel *channels;
1337                 size_t oss_frame_bytes = (runtime->oss.plugin_first->src_width * runtime->oss.plugin_first->src_format.channels) / 8;
1338                 if (!in_kernel) {
1339                         if (copy_from_user(runtime->oss.buffer, (const char __force __user *)buf, bytes))
1340                                 return -EFAULT;
1341                         buf = runtime->oss.buffer;
1342                 }
1343                 frames = bytes / oss_frame_bytes;
1344                 frames1 = snd_pcm_plug_client_channels_buf(substream, (char *)buf, frames, &channels);
1345                 if (frames1 < 0)
1346                         return frames1;
1347                 frames1 = snd_pcm_plug_write_transfer(substream, channels, frames1);
1348                 if (frames1 <= 0)
1349                         return frames1;
1350                 bytes = frames1 * oss_frame_bytes;
1351         } else
1352 #endif
1353         {
1354                 frames = bytes_to_frames(runtime, bytes);
1355                 frames1 = snd_pcm_oss_write3(substream, buf, frames, in_kernel);
1356                 if (frames1 <= 0)
1357                         return frames1;
1358                 bytes = frames_to_bytes(runtime, frames1);
1359         }
1360         return bytes;
1361 }
1362 
1363 static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes)
1364 {
1365         size_t xfer = 0;
1366         ssize_t tmp;
1367         struct snd_pcm_runtime *runtime = substream->runtime;
1368 
1369         if (atomic_read(&substream->mmap_count))
1370                 return -ENXIO;
1371 
1372         if ((tmp = snd_pcm_oss_make_ready(substream)) < 0)
1373                 return tmp;
1374         mutex_lock(&runtime->oss.params_lock);
1375         while (bytes > 0) {
1376                 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1377                         tmp = bytes;
1378                         if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
1379                                 tmp = runtime->oss.period_bytes - runtime->oss.buffer_used;
1380                         if (tmp > 0) {
1381                                 if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp)) {
1382                                         tmp = -EFAULT;
1383                                         goto err;
1384                                 }
1385                         }
1386                         runtime->oss.buffer_used += tmp;
1387                         buf += tmp;
1388                         bytes -= tmp;
1389                         xfer += tmp;
1390                         if (substream->oss.setup.partialfrag ||
1391                             runtime->oss.buffer_used == runtime->oss.period_bytes) {
1392                                 tmp = snd_pcm_oss_write2(substream, runtime->oss.buffer + runtime->oss.period_ptr, 
1393                                                          runtime->oss.buffer_used - runtime->oss.period_ptr, 1);
1394                                 if (tmp <= 0)
1395                                         goto err;
1396                                 runtime->oss.bytes += tmp;
1397                                 runtime->oss.period_ptr += tmp;
1398                                 runtime->oss.period_ptr %= runtime->oss.period_bytes;
1399                                 if (runtime->oss.period_ptr == 0 ||
1400                                     runtime->oss.period_ptr == runtime->oss.buffer_used)
1401                                         runtime->oss.buffer_used = 0;
1402                                 else if ((substream->f_flags & O_NONBLOCK) != 0) {
1403                                         tmp = -EAGAIN;
1404                                         goto err;
1405                                 }
1406                         }
1407                 } else {
1408                         tmp = snd_pcm_oss_write2(substream,
1409                                                  (const char __force *)buf,
1410                                                  runtime->oss.period_bytes, 0);
1411                         if (tmp <= 0)
1412                                 goto err;
1413                         runtime->oss.bytes += tmp;
1414                         buf += tmp;
1415                         bytes -= tmp;
1416                         xfer += tmp;
1417                         if ((substream->f_flags & O_NONBLOCK) != 0 &&
1418                             tmp != runtime->oss.period_bytes)
1419                                 break;
1420                 }
1421         }
1422         mutex_unlock(&runtime->oss.params_lock);
1423         return xfer;
1424 
1425  err:
1426         mutex_unlock(&runtime->oss.params_lock);
1427         return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1428 }
1429 
1430 static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel)
1431 {
1432         struct snd_pcm_runtime *runtime = substream->runtime;
1433         snd_pcm_sframes_t frames, frames1;
1434 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1435         char __user *final_dst = (char __force __user *)buf;
1436         if (runtime->oss.plugin_first) {
1437                 struct snd_pcm_plugin_channel *channels;
1438                 size_t oss_frame_bytes = (runtime->oss.plugin_last->dst_width * runtime->oss.plugin_last->dst_format.channels) / 8;
1439                 if (!in_kernel)
1440                         buf = runtime->oss.buffer;
1441                 frames = bytes / oss_frame_bytes;
1442                 frames1 = snd_pcm_plug_client_channels_buf(substream, buf, frames, &channels);
1443                 if (frames1 < 0)
1444                         return frames1;
1445                 frames1 = snd_pcm_plug_read_transfer(substream, channels, frames1);
1446                 if (frames1 <= 0)
1447                         return frames1;
1448                 bytes = frames1 * oss_frame_bytes;
1449                 if (!in_kernel && copy_to_user(final_dst, buf, bytes))
1450                         return -EFAULT;
1451         } else
1452 #endif
1453         {
1454                 frames = bytes_to_frames(runtime, bytes);
1455                 frames1 = snd_pcm_oss_read3(substream, buf, frames, in_kernel);
1456                 if (frames1 <= 0)
1457                         return frames1;
1458                 bytes = frames_to_bytes(runtime, frames1);
1459         }
1460         return bytes;
1461 }
1462 
1463 static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes)
1464 {
1465         size_t xfer = 0;
1466         ssize_t tmp;
1467         struct snd_pcm_runtime *runtime = substream->runtime;
1468 
1469         if (atomic_read(&substream->mmap_count))
1470                 return -ENXIO;
1471 
1472         if ((tmp = snd_pcm_oss_make_ready(substream)) < 0)
1473                 return tmp;
1474         mutex_lock(&runtime->oss.params_lock);
1475         while (bytes > 0) {
1476                 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1477                         if (runtime->oss.buffer_used == 0) {
1478                                 tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1);
1479                                 if (tmp <= 0)
1480                                         goto err;
1481                                 runtime->oss.bytes += tmp;
1482                                 runtime->oss.period_ptr = tmp;
1483                                 runtime->oss.buffer_used = tmp;
1484                         }
1485                         tmp = bytes;
1486                         if ((size_t) tmp > runtime->oss.buffer_used)
1487                                 tmp = runtime->oss.buffer_used;
1488                         if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp)) {
1489                                 tmp = -EFAULT;
1490                                 goto err;
1491                         }
1492                         buf += tmp;
1493                         bytes -= tmp;
1494                         xfer += tmp;
1495                         runtime->oss.buffer_used -= tmp;
1496                 } else {
1497                         tmp = snd_pcm_oss_read2(substream, (char __force *)buf,
1498                                                 runtime->oss.period_bytes, 0);
1499                         if (tmp <= 0)
1500                                 goto err;
1501                         runtime->oss.bytes += tmp;
1502                         buf += tmp;
1503                         bytes -= tmp;
1504                         xfer += tmp;
1505                 }
1506         }
1507         mutex_unlock(&runtime->oss.params_lock);
1508         return xfer;
1509 
1510  err:
1511         mutex_unlock(&runtime->oss.params_lock);
1512         return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1513 }
1514 
1515 static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
1516 {
1517         struct snd_pcm_substream *substream;
1518         struct snd_pcm_runtime *runtime;
1519         int i;
1520 
1521         for (i = 0; i < 2; i++) { 
1522                 substream = pcm_oss_file->streams[i];
1523                 if (!substream)
1524                         continue;
1525                 runtime = substream->runtime;
1526                 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1527                 runtime->oss.prepare = 1;
1528                 runtime->oss.buffer_used = 0;
1529                 runtime->oss.prev_hw_ptr_period = 0;
1530                 runtime->oss.period_ptr = 0;
1531         }
1532         return 0;
1533 }
1534 
1535 static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file)
1536 {
1537         struct snd_pcm_substream *substream;
1538         int err;
1539 
1540         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1541         if (substream != NULL) {
1542                 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1543                         return err;
1544                 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL);
1545         }
1546         /* note: all errors from the start action are ignored */
1547         /* OSS apps do not know, how to handle them */
1548         return 0;
1549 }
1550 
1551 static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size)
1552 {
1553         struct snd_pcm_runtime *runtime;
1554         ssize_t result = 0;
1555         snd_pcm_state_t state;
1556         long res;
1557         wait_queue_t wait;
1558 
1559         runtime = substream->runtime;
1560         init_waitqueue_entry(&wait, current);
1561         add_wait_queue(&runtime->sleep, &wait);
1562 #ifdef OSS_DEBUG
1563         pcm_dbg(substream->pcm, "sync1: size = %li\n", size);
1564 #endif
1565         while (1) {
1566                 result = snd_pcm_oss_write2(substream, runtime->oss.buffer, size, 1);
1567                 if (result > 0) {
1568                         runtime->oss.buffer_used = 0;
1569                         result = 0;
1570                         break;
1571                 }
1572                 if (result != 0 && result != -EAGAIN)
1573                         break;
1574                 result = 0;
1575                 set_current_state(TASK_INTERRUPTIBLE);
1576                 snd_pcm_stream_lock_irq(substream);
1577                 state = runtime->status->state;
1578                 snd_pcm_stream_unlock_irq(substream);
1579                 if (state != SNDRV_PCM_STATE_RUNNING) {
1580                         set_current_state(TASK_RUNNING);
1581                         break;
1582                 }
1583                 res = schedule_timeout(10 * HZ);
1584                 if (signal_pending(current)) {
1585                         result = -ERESTARTSYS;
1586                         break;
1587                 }
1588                 if (res == 0) {
1589                         pcm_err(substream->pcm,
1590                                 "OSS sync error - DMA timeout\n");
1591                         result = -EIO;
1592                         break;
1593                 }
1594         }
1595         remove_wait_queue(&runtime->sleep, &wait);
1596         return result;
1597 }
1598 
1599 static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
1600 {
1601         int err = 0;
1602         unsigned int saved_f_flags;
1603         struct snd_pcm_substream *substream;
1604         struct snd_pcm_runtime *runtime;
1605         snd_pcm_format_t format;
1606         unsigned long width;
1607         size_t size;
1608 
1609         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1610         if (substream != NULL) {
1611                 runtime = substream->runtime;
1612                 if (atomic_read(&substream->mmap_count))
1613                         goto __direct;
1614                 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1615                         return err;
1616                 format = snd_pcm_oss_format_from(runtime->oss.format);
1617                 width = snd_pcm_format_physical_width(format);
1618                 mutex_lock(&runtime->oss.params_lock);
1619                 if (runtime->oss.buffer_used > 0) {
1620 #ifdef OSS_DEBUG
1621                         pcm_dbg(substream->pcm, "sync: buffer_used\n");
1622 #endif
1623                         size = (8 * (runtime->oss.period_bytes - runtime->oss.buffer_used) + 7) / width;
1624                         snd_pcm_format_set_silence(format,
1625                                                    runtime->oss.buffer + runtime->oss.buffer_used,
1626                                                    size);
1627                         err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes);
1628                         if (err < 0) {
1629                                 mutex_unlock(&runtime->oss.params_lock);
1630                                 return err;
1631                         }
1632                 } else if (runtime->oss.period_ptr > 0) {
1633 #ifdef OSS_DEBUG
1634                         pcm_dbg(substream->pcm, "sync: period_ptr\n");
1635 #endif
1636                         size = runtime->oss.period_bytes - runtime->oss.period_ptr;
1637                         snd_pcm_format_set_silence(format,
1638                                                    runtime->oss.buffer,
1639                                                    size * 8 / width);
1640                         err = snd_pcm_oss_sync1(substream, size);
1641                         if (err < 0) {
1642                                 mutex_unlock(&runtime->oss.params_lock);
1643                                 return err;
1644                         }
1645                 }
1646                 /*
1647                  * The ALSA's period might be a bit large than OSS one.
1648                  * Fill the remain portion of ALSA period with zeros.
1649                  */
1650                 size = runtime->control->appl_ptr % runtime->period_size;
1651                 if (size > 0) {
1652                         size = runtime->period_size - size;
1653                         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
1654                                 size = (runtime->frame_bits * size) / 8;
1655                                 while (size > 0) {
1656                                         mm_segment_t fs;
1657                                         size_t size1 = size < runtime->oss.period_bytes ? size : runtime->oss.period_bytes;
1658                                         size -= size1;
1659                                         size1 *= 8;
1660                                         size1 /= runtime->sample_bits;
1661                                         snd_pcm_format_set_silence(runtime->format,
1662                                                                    runtime->oss.buffer,
1663                                                                    size1);
1664                                         size1 /= runtime->channels; /* frames */
1665                                         fs = snd_enter_user();
1666                                         snd_pcm_lib_write(substream, (void __force __user *)runtime->oss.buffer, size1);
1667                                         snd_leave_user(fs);
1668                                 }
1669                         } else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) {
1670                                 void __user *buffers[runtime->channels];
1671                                 memset(buffers, 0, runtime->channels * sizeof(void *));
1672                                 snd_pcm_lib_writev(substream, buffers, size);
1673                         }
1674                 }
1675                 mutex_unlock(&runtime->oss.params_lock);
1676                 /*
1677                  * finish sync: drain the buffer
1678                  */
1679               __direct:
1680                 saved_f_flags = substream->f_flags;
1681                 substream->f_flags &= ~O_NONBLOCK;
1682                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1683                 substream->f_flags = saved_f_flags;
1684                 if (err < 0)
1685                         return err;
1686                 runtime->oss.prepare = 1;
1687         }
1688 
1689         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
1690         if (substream != NULL) {
1691                 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1692                         return err;
1693                 runtime = substream->runtime;
1694                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1695                 if (err < 0)
1696                         return err;
1697                 runtime->oss.buffer_used = 0;
1698                 runtime->oss.prepare = 1;
1699         }
1700         return 0;
1701 }
1702 
1703 static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)
1704 {
1705         int idx;
1706 
1707         for (idx = 1; idx >= 0; --idx) {
1708                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1709                 struct snd_pcm_runtime *runtime;
1710                 if (substream == NULL)
1711                         continue;
1712                 runtime = substream->runtime;
1713                 if (rate < 1000)
1714                         rate = 1000;
1715                 else if (rate > 192000)
1716                         rate = 192000;
1717                 if (runtime->oss.rate != rate) {
1718                         runtime->oss.params = 1;
1719                         runtime->oss.rate = rate;
1720                 }
1721         }
1722         return snd_pcm_oss_get_rate(pcm_oss_file);
1723 }
1724 
1725 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file)
1726 {
1727         struct snd_pcm_substream *substream;
1728         int err;
1729         
1730         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1731                 return err;
1732         return substream->runtime->oss.rate;
1733 }
1734 
1735 static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels)
1736 {
1737         int idx;
1738         if (channels < 1)
1739                 channels = 1;
1740         if (channels > 128)
1741                 return -EINVAL;
1742         for (idx = 1; idx >= 0; --idx) {
1743                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1744                 struct snd_pcm_runtime *runtime;
1745                 if (substream == NULL)
1746                         continue;
1747                 runtime = substream->runtime;
1748                 if (runtime->oss.channels != channels) {
1749                         runtime->oss.params = 1;
1750                         runtime->oss.channels = channels;
1751                 }
1752         }
1753         return snd_pcm_oss_get_channels(pcm_oss_file);
1754 }
1755 
1756 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file)
1757 {
1758         struct snd_pcm_substream *substream;
1759         int err;
1760         
1761         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1762                 return err;
1763         return substream->runtime->oss.channels;
1764 }
1765 
1766 static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file)
1767 {
1768         struct snd_pcm_substream *substream;
1769         int err;
1770         
1771         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1772                 return err;
1773         return substream->runtime->oss.period_bytes;
1774 }
1775 
1776 static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file)
1777 {
1778         struct snd_pcm_substream *substream;
1779         int err;
1780         int direct;
1781         struct snd_pcm_hw_params *params;
1782         unsigned int formats = 0;
1783         struct snd_mask format_mask;
1784         int fmt;
1785 
1786         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1787                 return err;
1788         if (atomic_read(&substream->mmap_count))
1789                 direct = 1;
1790         else
1791                 direct = substream->oss.setup.direct;
1792         if (!direct)
1793                 return AFMT_MU_LAW | AFMT_U8 |
1794                        AFMT_S16_LE | AFMT_S16_BE |
1795                        AFMT_S8 | AFMT_U16_LE |
1796                        AFMT_U16_BE |
1797                         AFMT_S32_LE | AFMT_S32_BE |
1798                         AFMT_S24_LE | AFMT_S24_BE |
1799                         AFMT_S24_PACKED;
1800         params = kmalloc(sizeof(*params), GFP_KERNEL);
1801         if (!params)
1802                 return -ENOMEM;
1803         _snd_pcm_hw_params_any(params);
1804         err = snd_pcm_hw_refine(substream, params);
1805         format_mask = *hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 
1806         kfree(params);
1807         if (err < 0)
1808                 return err;
1809         for (fmt = 0; fmt < 32; ++fmt) {
1810                 if (snd_mask_test(&format_mask, fmt)) {
1811                         int f = snd_pcm_oss_format_to(fmt);
1812                         if (f >= 0)
1813                                 formats |= f;
1814                 }
1815         }
1816         return formats;
1817 }
1818 
1819 static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format)
1820 {
1821         int formats, idx;
1822         
1823         if (format != AFMT_QUERY) {
1824                 formats = snd_pcm_oss_get_formats(pcm_oss_file);
1825                 if (formats < 0)
1826                         return formats;
1827                 if (!(formats & format))
1828                         format = AFMT_U8;
1829                 for (idx = 1; idx >= 0; --idx) {
1830                         struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1831                         struct snd_pcm_runtime *runtime;
1832                         if (substream == NULL)
1833                                 continue;
1834                         runtime = substream->runtime;
1835                         if (runtime->oss.format != format) {
1836                                 runtime->oss.params = 1;
1837                                 runtime->oss.format = format;
1838                         }
1839                 }
1840         }
1841         return snd_pcm_oss_get_format(pcm_oss_file);
1842 }
1843 
1844 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file)
1845 {
1846         struct snd_pcm_substream *substream;
1847         int err;
1848         
1849         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1850                 return err;
1851         return substream->runtime->oss.format;
1852 }
1853 
1854 static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide)
1855 {
1856         struct snd_pcm_runtime *runtime;
1857 
1858         if (substream == NULL)
1859                 return 0;
1860         runtime = substream->runtime;
1861         if (subdivide == 0) {
1862                 subdivide = runtime->oss.subdivision;
1863                 if (subdivide == 0)
1864                         subdivide = 1;
1865                 return subdivide;
1866         }
1867         if (runtime->oss.subdivision || runtime->oss.fragshift)
1868                 return -EINVAL;
1869         if (subdivide != 1 && subdivide != 2 && subdivide != 4 &&
1870             subdivide != 8 && subdivide != 16)
1871                 return -EINVAL;
1872         runtime->oss.subdivision = subdivide;
1873         runtime->oss.params = 1;
1874         return subdivide;
1875 }
1876 
1877 static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide)
1878 {
1879         int err = -EINVAL, idx;
1880 
1881         for (idx = 1; idx >= 0; --idx) {
1882                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1883                 if (substream == NULL)
1884                         continue;
1885                 if ((err = snd_pcm_oss_set_subdivide1(substream, subdivide)) < 0)
1886                         return err;
1887         }
1888         return err;
1889 }
1890 
1891 static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val)
1892 {
1893         struct snd_pcm_runtime *runtime;
1894 
1895         if (substream == NULL)
1896                 return 0;
1897         runtime = substream->runtime;
1898         if (runtime->oss.subdivision || runtime->oss.fragshift)
1899                 return -EINVAL;
1900         runtime->oss.fragshift = val & 0xffff;
1901         runtime->oss.maxfrags = (val >> 16) & 0xffff;
1902         if (runtime->oss.fragshift < 4)         /* < 16 */
1903                 runtime->oss.fragshift = 4;
1904         if (runtime->oss.maxfrags < 2)
1905                 runtime->oss.maxfrags = 2;
1906         runtime->oss.params = 1;
1907         return 0;
1908 }
1909 
1910 static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val)
1911 {
1912         int err = -EINVAL, idx;
1913 
1914         for (idx = 1; idx >= 0; --idx) {
1915                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1916                 if (substream == NULL)
1917                         continue;
1918                 if ((err = snd_pcm_oss_set_fragment1(substream, val)) < 0)
1919                         return err;
1920         }
1921         return err;
1922 }
1923 
1924 static int snd_pcm_oss_nonblock(struct file * file)
1925 {
1926         spin_lock(&file->f_lock);
1927         file->f_flags |= O_NONBLOCK;
1928         spin_unlock(&file->f_lock);
1929         return 0;
1930 }
1931 
1932 static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res)
1933 {
1934 
1935         if (substream == NULL) {
1936                 res &= ~DSP_CAP_DUPLEX;
1937                 return res;
1938         }
1939 #ifdef DSP_CAP_MULTI
1940         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1941                 if (substream->pstr->substream_count > 1)
1942                         res |= DSP_CAP_MULTI;
1943 #endif
1944         /* DSP_CAP_REALTIME is set all times: */
1945         /* all ALSA drivers can return actual pointer in ring buffer */
1946 #if defined(DSP_CAP_REALTIME) && 0
1947         {
1948                 struct snd_pcm_runtime *runtime = substream->runtime;
1949                 if (runtime->info & (SNDRV_PCM_INFO_BLOCK_TRANSFER|SNDRV_PCM_INFO_BATCH))
1950                         res &= ~DSP_CAP_REALTIME;
1951         }
1952 #endif
1953         return res;
1954 }
1955 
1956 static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)
1957 {
1958         int result, idx;
1959         
1960         result = DSP_CAP_TRIGGER | DSP_CAP_MMAP | DSP_CAP_DUPLEX | DSP_CAP_REALTIME;
1961         for (idx = 0; idx < 2; idx++) {
1962                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1963                 result = snd_pcm_oss_get_caps1(substream, result);
1964         }
1965         result |= 0x0001;       /* revision - same as SB AWE 64 */
1966         return result;
1967 }
1968 
1969 static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
1970                                       snd_pcm_uframes_t hw_ptr)
1971 {
1972         struct snd_pcm_runtime *runtime = substream->runtime;
1973         snd_pcm_uframes_t appl_ptr;
1974         appl_ptr = hw_ptr + runtime->buffer_size;
1975         appl_ptr %= runtime->boundary;
1976         runtime->control->appl_ptr = appl_ptr;
1977 }
1978 
1979 static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger)
1980 {
1981         struct snd_pcm_runtime *runtime;
1982         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
1983         int err, cmd;
1984 
1985 #ifdef OSS_DEBUG
1986         pcm_dbg(substream->pcm, "pcm_oss: trigger = 0x%x\n", trigger);
1987 #endif
1988         
1989         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1990         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
1991 
1992         if (psubstream) {
1993                 if ((err = snd_pcm_oss_make_ready(psubstream)) < 0)
1994                         return err;
1995         }
1996         if (csubstream) {
1997                 if ((err = snd_pcm_oss_make_ready(csubstream)) < 0)
1998                         return err;
1999         }
2000         if (psubstream) {
2001                 runtime = psubstream->runtime;
2002                 if (trigger & PCM_ENABLE_OUTPUT) {
2003                         if (runtime->oss.trigger)
2004                                 goto _skip1;
2005                         if (atomic_read(&psubstream->mmap_count))
2006                                 snd_pcm_oss_simulate_fill(psubstream,
2007                                                 get_hw_ptr_period(runtime));
2008                         runtime->oss.trigger = 1;
2009                         runtime->start_threshold = 1;
2010                         cmd = SNDRV_PCM_IOCTL_START;
2011                 } else {
2012                         if (!runtime->oss.trigger)
2013                                 goto _skip1;
2014                         runtime->oss.trigger = 0;
2015                         runtime->start_threshold = runtime->boundary;
2016                         cmd = SNDRV_PCM_IOCTL_DROP;
2017                         runtime->oss.prepare = 1;
2018                 }
2019                 err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL);
2020                 if (err < 0)
2021                         return err;
2022         }
2023  _skip1:
2024         if (csubstream) {
2025                 runtime = csubstream->runtime;
2026                 if (trigger & PCM_ENABLE_INPUT) {
2027                         if (runtime->oss.trigger)
2028                                 goto _skip2;
2029                         runtime->oss.trigger = 1;
2030                         runtime->start_threshold = 1;
2031                         cmd = SNDRV_PCM_IOCTL_START;
2032                 } else {
2033                         if (!runtime->oss.trigger)
2034                                 goto _skip2;
2035                         runtime->oss.trigger = 0;
2036                         runtime->start_threshold = runtime->boundary;
2037                         cmd = SNDRV_PCM_IOCTL_DROP;
2038                         runtime->oss.prepare = 1;
2039                 }
2040                 err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL);
2041                 if (err < 0)
2042                         return err;
2043         }
2044  _skip2:
2045         return 0;
2046 }
2047 
2048 static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file)
2049 {
2050         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2051         int result = 0;
2052 
2053         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2054         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2055         if (psubstream && psubstream->runtime && psubstream->runtime->oss.trigger)
2056                 result |= PCM_ENABLE_OUTPUT;
2057         if (csubstream && csubstream->runtime && csubstream->runtime->oss.trigger)
2058                 result |= PCM_ENABLE_INPUT;
2059         return result;
2060 }
2061 
2062 static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file)
2063 {
2064         struct snd_pcm_substream *substream;
2065         struct snd_pcm_runtime *runtime;
2066         snd_pcm_sframes_t delay;
2067         int err;
2068 
2069         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2070         if (substream == NULL)
2071                 return -EINVAL;
2072         if ((err = snd_pcm_oss_make_ready(substream)) < 0)
2073                 return err;
2074         runtime = substream->runtime;
2075         if (runtime->oss.params || runtime->oss.prepare)
2076                 return 0;
2077         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2078         if (err == -EPIPE)
2079                 delay = 0;      /* hack for broken OSS applications */
2080         else if (err < 0)
2081                 return err;
2082         return snd_pcm_oss_bytes(substream, delay);
2083 }
2084 
2085 static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info)
2086 {       
2087         struct snd_pcm_substream *substream;
2088         struct snd_pcm_runtime *runtime;
2089         snd_pcm_sframes_t delay;
2090         int fixup;
2091         struct count_info info;
2092         int err;
2093 
2094         if (_info == NULL)
2095                 return -EFAULT;
2096         substream = pcm_oss_file->streams[stream];
2097         if (substream == NULL)
2098                 return -EINVAL;
2099         if ((err = snd_pcm_oss_make_ready(substream)) < 0)
2100                 return err;
2101         runtime = substream->runtime;
2102         if (runtime->oss.params || runtime->oss.prepare) {
2103                 memset(&info, 0, sizeof(info));
2104                 if (copy_to_user(_info, &info, sizeof(info)))
2105                         return -EFAULT;
2106                 return 0;
2107         }
2108         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2109                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2110                 if (err == -EPIPE || err == -ESTRPIPE || (! err && delay < 0)) {
2111                         err = 0;
2112                         delay = 0;
2113                         fixup = 0;
2114                 } else {
2115                         fixup = runtime->oss.buffer_used;
2116                 }
2117         } else {
2118                 err = snd_pcm_oss_capture_position_fixup(substream, &delay);
2119                 fixup = -runtime->oss.buffer_used;
2120         }
2121         if (err < 0)
2122                 return err;
2123         info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size);
2124         if (atomic_read(&substream->mmap_count)) {
2125                 snd_pcm_sframes_t n;
2126                 delay = get_hw_ptr_period(runtime);
2127                 n = delay - runtime->oss.prev_hw_ptr_period;
2128                 if (n < 0)
2129                         n += runtime->boundary;
2130                 info.blocks = n / runtime->period_size;
2131                 runtime->oss.prev_hw_ptr_period = delay;
2132                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2133                         snd_pcm_oss_simulate_fill(substream, delay);
2134                 info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
2135         } else {
2136                 delay = snd_pcm_oss_bytes(substream, delay);
2137                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2138                         if (substream->oss.setup.buggyptr)
2139                                 info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
2140                         else
2141                                 info.blocks = (delay + fixup) / runtime->oss.period_bytes;
2142                         info.bytes = (runtime->oss.bytes - delay) & INT_MAX;
2143                 } else {
2144                         delay += fixup;
2145                         info.blocks = delay / runtime->oss.period_bytes;
2146                         info.bytes = (runtime->oss.bytes + delay) & INT_MAX;
2147                 }
2148         }
2149         if (copy_to_user(_info, &info, sizeof(info)))
2150                 return -EFAULT;
2151         return 0;
2152 }
2153 
2154 static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info)
2155 {
2156         struct snd_pcm_substream *substream;
2157         struct snd_pcm_runtime *runtime;
2158         snd_pcm_sframes_t avail;
2159         int fixup;
2160         struct audio_buf_info info;
2161         int err;
2162 
2163         if (_info == NULL)
2164                 return -EFAULT;
2165         substream = pcm_oss_file->streams[stream];
2166         if (substream == NULL)
2167                 return -EINVAL;
2168         runtime = substream->runtime;
2169 
2170         if (runtime->oss.params &&
2171             (err = snd_pcm_oss_change_params(substream, false)) < 0)
2172                 return err;
2173 
2174         info.fragsize = runtime->oss.period_bytes;
2175         info.fragstotal = runtime->periods;
2176         if (runtime->oss.prepare) {
2177                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2178                         info.bytes = runtime->oss.period_bytes * runtime->oss.periods;
2179                         info.fragments = runtime->oss.periods;
2180                 } else {
2181                         info.bytes = 0;
2182                         info.fragments = 0;
2183                 }
2184         } else {
2185                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2186                         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &avail);
2187                         if (err == -EPIPE || err == -ESTRPIPE || (! err && avail < 0)) {
2188                                 avail = runtime->buffer_size;
2189                                 err = 0;
2190                                 fixup = 0;
2191                         } else {
2192                                 avail = runtime->buffer_size - avail;
2193                                 fixup = -runtime->oss.buffer_used;
2194                         }
2195                 } else {
2196                         err = snd_pcm_oss_capture_position_fixup(substream, &avail);
2197                         fixup = runtime->oss.buffer_used;
2198                 }
2199                 if (err < 0)
2200                         return err;
2201                 info.bytes = snd_pcm_oss_bytes(substream, avail) + fixup;
2202                 info.fragments = info.bytes / runtime->oss.period_bytes;
2203         }
2204 
2205 #ifdef OSS_DEBUG
2206         pcm_dbg(substream->pcm,
2207                 "pcm_oss: space: bytes = %i, fragments = %i, fragstotal = %i, fragsize = %i\n",
2208                 info.bytes, info.fragments, info.fragstotal, info.fragsize);
2209 #endif
2210         if (copy_to_user(_info, &info, sizeof(info)))
2211                 return -EFAULT;
2212         return 0;
2213 }
2214 
2215 static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info)
2216 {
2217         // it won't be probably implemented
2218         // pr_debug("TODO: snd_pcm_oss_get_mapbuf\n");
2219         return -EINVAL;
2220 }
2221 
2222 static const char *strip_task_path(const char *path)
2223 {
2224         const char *ptr, *ptrl = NULL;
2225         for (ptr = path; *ptr; ptr++) {
2226                 if (*ptr == '/')
2227                         ptrl = ptr + 1;
2228         }
2229         return ptrl;
2230 }
2231 
2232 static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
2233                                       const char *task_name,
2234                                       struct snd_pcm_oss_setup *rsetup)
2235 {
2236         struct snd_pcm_oss_setup *setup;
2237 
2238         mutex_lock(&pcm->streams[stream].oss.setup_mutex);
2239         do {
2240                 for (setup = pcm->streams[stream].oss.setup_list; setup;
2241                      setup = setup->next) {
2242                         if (!strcmp(setup->task_name, task_name))
2243                                 goto out;
2244                 }
2245         } while ((task_name = strip_task_path(task_name)) != NULL);
2246  out:
2247         if (setup)
2248                 *rsetup = *setup;
2249         mutex_unlock(&pcm->streams[stream].oss.setup_mutex);
2250 }
2251 
2252 static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream)
2253 {
2254         struct snd_pcm_runtime *runtime;
2255         runtime = substream->runtime;
2256         vfree(runtime->oss.buffer);
2257         runtime->oss.buffer = NULL;
2258 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2259         snd_pcm_oss_plugin_clear(substream);
2260 #endif
2261         substream->oss.oss = 0;
2262 }
2263 
2264 static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
2265                                        struct snd_pcm_oss_setup *setup,
2266                                        int minor)
2267 {
2268         struct snd_pcm_runtime *runtime;
2269 
2270         substream->oss.oss = 1;
2271         substream->oss.setup = *setup;
2272         if (setup->nonblock)
2273                 substream->f_flags |= O_NONBLOCK;
2274         else if (setup->block)
2275                 substream->f_flags &= ~O_NONBLOCK;
2276         runtime = substream->runtime;
2277         runtime->oss.params = 1;
2278         runtime->oss.trigger = 1;
2279         runtime->oss.rate = 8000;
2280         mutex_init(&runtime->oss.params_lock);
2281         switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
2282         case SNDRV_MINOR_OSS_PCM_8:
2283                 runtime->oss.format = AFMT_U8;
2284                 break;
2285         case SNDRV_MINOR_OSS_PCM_16:
2286                 runtime->oss.format = AFMT_S16_LE;
2287                 break;
2288         default:
2289                 runtime->oss.format = AFMT_MU_LAW;
2290         }
2291         runtime->oss.channels = 1;
2292         runtime->oss.fragshift = 0;
2293         runtime->oss.maxfrags = 0;
2294         runtime->oss.subdivision = 0;
2295         substream->pcm_release = snd_pcm_oss_release_substream;
2296 }
2297 
2298 static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file)
2299 {
2300         int cidx;
2301         if (!pcm_oss_file)
2302                 return 0;
2303         for (cidx = 0; cidx < 2; ++cidx) {
2304                 struct snd_pcm_substream *substream = pcm_oss_file->streams[cidx];
2305                 if (substream)
2306                         snd_pcm_release_substream(substream);
2307         }
2308         kfree(pcm_oss_file);
2309         return 0;
2310 }
2311 
2312 static int snd_pcm_oss_open_file(struct file *file,
2313                                  struct snd_pcm *pcm,
2314                                  struct snd_pcm_oss_file **rpcm_oss_file,
2315                                  int minor,
2316                                  struct snd_pcm_oss_setup *setup)
2317 {
2318         int idx, err;
2319         struct snd_pcm_oss_file *pcm_oss_file;
2320         struct snd_pcm_substream *substream;
2321         fmode_t f_mode = file->f_mode;
2322 
2323         if (rpcm_oss_file)
2324                 *rpcm_oss_file = NULL;
2325 
2326         pcm_oss_file = kzalloc(sizeof(*pcm_oss_file), GFP_KERNEL);
2327         if (pcm_oss_file == NULL)
2328                 return -ENOMEM;
2329 
2330         if ((f_mode & (FMODE_WRITE|FMODE_READ)) == (FMODE_WRITE|FMODE_READ) &&
2331             (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX))
2332                 f_mode = FMODE_WRITE;
2333 
2334         file->f_flags &= ~O_APPEND;
2335         for (idx = 0; idx < 2; idx++) {
2336                 if (setup[idx].disable)
2337                         continue;
2338                 if (! pcm->streams[idx].substream_count)
2339                         continue; /* no matching substream */
2340                 if (idx == SNDRV_PCM_STREAM_PLAYBACK) {
2341                         if (! (f_mode & FMODE_WRITE))
2342                                 continue;
2343                 } else {
2344                         if (! (f_mode & FMODE_READ))
2345                                 continue;
2346                 }
2347                 err = snd_pcm_open_substream(pcm, idx, file, &substream);
2348                 if (err < 0) {
2349                         snd_pcm_oss_release_file(pcm_oss_file);
2350                         return err;
2351                 }
2352 
2353                 pcm_oss_file->streams[idx] = substream;
2354                 substream->file = pcm_oss_file;
2355                 snd_pcm_oss_init_substream(substream, &setup[idx], minor);
2356         }
2357         
2358         if (!pcm_oss_file->streams[0] && !pcm_oss_file->streams[1]) {
2359                 snd_pcm_oss_release_file(pcm_oss_file);
2360                 return -EINVAL;
2361         }
2362 
2363         file->private_data = pcm_oss_file;
2364         if (rpcm_oss_file)
2365                 *rpcm_oss_file = pcm_oss_file;
2366         return 0;
2367 }
2368 
2369 
2370 static int snd_task_name(struct task_struct *task, char *name, size_t size)
2371 {
2372         unsigned int idx;
2373 
2374         if (snd_BUG_ON(!task || !name || size < 2))
2375                 return -EINVAL;
2376         for (idx = 0; idx < sizeof(task->comm) && idx + 1 < size; idx++)
2377                 name[idx] = task->comm[idx];
2378         name[idx] = '\0';
2379         return 0;
2380 }
2381 
2382 static int snd_pcm_oss_open(struct inode *inode, struct file *file)
2383 {
2384         int err;
2385         char task_name[32];
2386         struct snd_pcm *pcm;
2387         struct snd_pcm_oss_file *pcm_oss_file;
2388         struct snd_pcm_oss_setup setup[2];
2389         int nonblock;
2390         wait_queue_t wait;
2391 
2392         err = nonseekable_open(inode, file);
2393         if (err < 0)
2394                 return err;
2395 
2396         pcm = snd_lookup_oss_minor_data(iminor(inode),
2397                                         SNDRV_OSS_DEVICE_TYPE_PCM);
2398         if (pcm == NULL) {
2399                 err = -ENODEV;
2400                 goto __error1;
2401         }
2402         err = snd_card_file_add(pcm->card, file);
2403         if (err < 0)
2404                 goto __error1;
2405         if (!try_module_get(pcm->card->module)) {
2406                 err = -EFAULT;
2407                 goto __error2;
2408         }
2409         if (snd_task_name(current, task_name, sizeof(task_name)) < 0) {
2410                 err = -EFAULT;
2411                 goto __error;
2412         }
2413         memset(setup, 0, sizeof(setup));
2414         if (file->f_mode & FMODE_WRITE)
2415                 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_PLAYBACK,
2416                                            task_name, &setup[0]);
2417         if (file->f_mode & FMODE_READ)
2418                 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_CAPTURE,
2419                                            task_name, &setup[1]);
2420 
2421         nonblock = !!(file->f_flags & O_NONBLOCK);
2422         if (!nonblock)
2423                 nonblock = nonblock_open;
2424 
2425         init_waitqueue_entry(&wait, current);
2426         add_wait_queue(&pcm->open_wait, &wait);
2427         mutex_lock(&pcm->open_mutex);
2428         while (1) {
2429                 err = snd_pcm_oss_open_file(file, pcm, &pcm_oss_file,
2430                                             iminor(inode), setup);
2431                 if (err >= 0)
2432                         break;
2433                 if (err == -EAGAIN) {
2434                         if (nonblock) {
2435                                 err = -EBUSY;
2436                                 break;
2437                         }
2438                 } else
2439                         break;
2440                 set_current_state(TASK_INTERRUPTIBLE);
2441                 mutex_unlock(&pcm->open_mutex);
2442                 schedule();
2443                 mutex_lock(&pcm->open_mutex);
2444                 if (pcm->card->shutdown) {
2445                         err = -ENODEV;
2446                         break;
2447                 }
2448                 if (signal_pending(current)) {
2449                         err = -ERESTARTSYS;
2450                         break;
2451                 }
2452         }
2453         remove_wait_queue(&pcm->open_wait, &wait);
2454         mutex_unlock(&pcm->open_mutex);
2455         if (err < 0)
2456                 goto __error;
2457         snd_card_unref(pcm->card);
2458         return err;
2459 
2460       __error:
2461         module_put(pcm->card->module);
2462       __error2:
2463         snd_card_file_remove(pcm->card, file);
2464       __error1:
2465         if (pcm)
2466                 snd_card_unref(pcm->card);
2467         return err;
2468 }
2469 
2470 static int snd_pcm_oss_release(struct inode *inode, struct file *file)
2471 {
2472         struct snd_pcm *pcm;
2473         struct snd_pcm_substream *substream;
2474         struct snd_pcm_oss_file *pcm_oss_file;
2475 
2476         pcm_oss_file = file->private_data;
2477         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2478         if (substream == NULL)
2479                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2480         if (snd_BUG_ON(!substream))
2481                 return -ENXIO;
2482         pcm = substream->pcm;
2483         if (!pcm->card->shutdown)
2484                 snd_pcm_oss_sync(pcm_oss_file);
2485         mutex_lock(&pcm->open_mutex);
2486         snd_pcm_oss_release_file(pcm_oss_file);
2487         mutex_unlock(&pcm->open_mutex);
2488         wake_up(&pcm->open_wait);
2489         module_put(pcm->card->module);
2490         snd_card_file_remove(pcm->card, file);
2491         return 0;
2492 }
2493 
2494 static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2495 {
2496         struct snd_pcm_oss_file *pcm_oss_file;
2497         int __user *p = (int __user *)arg;
2498         int res;
2499 
2500         pcm_oss_file = file->private_data;
2501         if (cmd == OSS_GETVERSION)
2502                 return put_user(SNDRV_OSS_VERSION, p);
2503         if (cmd == OSS_ALSAEMULVER)
2504                 return put_user(1, p);
2505 #if IS_REACHABLE(CONFIG_SND_MIXER_OSS)
2506         if (((cmd >> 8) & 0xff) == 'M') {       /* mixer ioctl - for OSS compatibility */
2507                 struct snd_pcm_substream *substream;
2508                 int idx;
2509                 for (idx = 0; idx < 2; ++idx) {
2510                         substream = pcm_oss_file->streams[idx];
2511                         if (substream != NULL)
2512                                 break;
2513                 }
2514                 if (snd_BUG_ON(idx >= 2))
2515                         return -ENXIO;
2516                 return snd_mixer_oss_ioctl_card(substream->pcm->card, cmd, arg);
2517         }
2518 #endif
2519         if (((cmd >> 8) & 0xff) != 'P')
2520                 return -EINVAL;
2521 #ifdef OSS_DEBUG
2522         pr_debug("pcm_oss: ioctl = 0x%x\n", cmd);
2523 #endif
2524         switch (cmd) {
2525         case SNDCTL_DSP_RESET:
2526                 return snd_pcm_oss_reset(pcm_oss_file);
2527         case SNDCTL_DSP_SYNC:
2528                 return snd_pcm_oss_sync(pcm_oss_file);
2529         case SNDCTL_DSP_SPEED:
2530                 if (get_user(res, p))
2531                         return -EFAULT;
2532                 if ((res = snd_pcm_oss_set_rate(pcm_oss_file, res))<0)
2533                         return res;
2534                 return put_user(res, p);
2535         case SOUND_PCM_READ_RATE:
2536                 res = snd_pcm_oss_get_rate(pcm_oss_file);
2537                 if (res < 0)
2538                         return res;
2539                 return put_user(res, p);
2540         case SNDCTL_DSP_STEREO:
2541                 if (get_user(res, p))
2542                         return -EFAULT;
2543                 res = res > 0 ? 2 : 1;
2544                 if ((res = snd_pcm_oss_set_channels(pcm_oss_file, res)) < 0)
2545                         return res;
2546                 return put_user(--res, p);
2547         case SNDCTL_DSP_GETBLKSIZE:
2548                 res = snd_pcm_oss_get_block_size(pcm_oss_file);
2549                 if (res < 0)
2550                         return res;
2551                 return put_user(res, p);
2552         case SNDCTL_DSP_SETFMT:
2553                 if (get_user(res, p))
2554                         return -EFAULT;
2555                 res = snd_pcm_oss_set_format(pcm_oss_file, res);
2556                 if (res < 0)
2557                         return res;
2558                 return put_user(res, p);
2559         case SOUND_PCM_READ_BITS:
2560                 res = snd_pcm_oss_get_format(pcm_oss_file);
2561                 if (res < 0)
2562                         return res;
2563                 return put_user(res, p);
2564         case SNDCTL_DSP_CHANNELS:
2565                 if (get_user(res, p))
2566                         return -EFAULT;
2567                 res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2568                 if (res < 0)
2569                         return res;
2570                 return put_user(res, p);
2571         case SOUND_PCM_READ_CHANNELS:
2572                 res = snd_pcm_oss_get_channels(pcm_oss_file);
2573                 if (res < 0)
2574                         return res;
2575                 return put_user(res, p);
2576         case SOUND_PCM_WRITE_FILTER:
2577         case SOUND_PCM_READ_FILTER:
2578                 return -EIO;
2579         case SNDCTL_DSP_POST:
2580                 return snd_pcm_oss_post(pcm_oss_file);
2581         case SNDCTL_DSP_SUBDIVIDE:
2582                 if (get_user(res, p))
2583                         return -EFAULT;
2584                 res = snd_pcm_oss_set_subdivide(pcm_oss_file, res);
2585                 if (res < 0)
2586                         return res;
2587                 return put_user(res, p);
2588         case SNDCTL_DSP_SETFRAGMENT:
2589                 if (get_user(res, p))
2590                         return -EFAULT;
2591                 return snd_pcm_oss_set_fragment(pcm_oss_file, res);
2592         case SNDCTL_DSP_GETFMTS:
2593                 res = snd_pcm_oss_get_formats(pcm_oss_file);
2594                 if (res < 0)
2595                         return res;
2596                 return put_user(res, p);
2597         case SNDCTL_DSP_GETOSPACE:
2598         case SNDCTL_DSP_GETISPACE:
2599                 return snd_pcm_oss_get_space(pcm_oss_file,
2600                         cmd == SNDCTL_DSP_GETISPACE ?
2601                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2602                         (struct audio_buf_info __user *) arg);
2603         case SNDCTL_DSP_NONBLOCK:
2604                 return snd_pcm_oss_nonblock(file);
2605         case SNDCTL_DSP_GETCAPS:
2606                 res = snd_pcm_oss_get_caps(pcm_oss_file);
2607                 if (res < 0)
2608                         return res;
2609                 return put_user(res, p);
2610         case SNDCTL_DSP_GETTRIGGER:
2611                 res = snd_pcm_oss_get_trigger(pcm_oss_file);
2612                 if (res < 0)
2613                         return res;
2614                 return put_user(res, p);
2615         case SNDCTL_DSP_SETTRIGGER:
2616                 if (get_user(res, p))
2617                         return -EFAULT;
2618                 return snd_pcm_oss_set_trigger(pcm_oss_file, res);
2619         case SNDCTL_DSP_GETIPTR:
2620         case SNDCTL_DSP_GETOPTR:
2621                 return snd_pcm_oss_get_ptr(pcm_oss_file,
2622                         cmd == SNDCTL_DSP_GETIPTR ?
2623                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2624                         (struct count_info __user *) arg);
2625         case SNDCTL_DSP_MAPINBUF:
2626         case SNDCTL_DSP_MAPOUTBUF:
2627                 return snd_pcm_oss_get_mapbuf(pcm_oss_file,
2628                         cmd == SNDCTL_DSP_MAPINBUF ?
2629                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2630                         (struct buffmem_desc __user *) arg);
2631         case SNDCTL_DSP_SETSYNCRO:
2632                 /* stop DMA now.. */
2633                 return 0;
2634         case SNDCTL_DSP_SETDUPLEX:
2635                 if (snd_pcm_oss_get_caps(pcm_oss_file) & DSP_CAP_DUPLEX)
2636                         return 0;
2637                 return -EIO;
2638         case SNDCTL_DSP_GETODELAY:
2639                 res = snd_pcm_oss_get_odelay(pcm_oss_file);
2640                 if (res < 0) {
2641                         /* it's for sure, some broken apps don't check for error codes */
2642                         put_user(0, p);
2643                         return res;
2644                 }
2645                 return put_user(res, p);
2646         case SNDCTL_DSP_PROFILE:
2647                 return 0;       /* silently ignore */
2648         default:
2649                 pr_debug("pcm_oss: unknown command = 0x%x\n", cmd);
2650         }
2651         return -EINVAL;
2652 }
2653 
2654 #ifdef CONFIG_COMPAT
2655 /* all compatible */
2656 static long snd_pcm_oss_ioctl_compat(struct file *file, unsigned int cmd,
2657                                      unsigned long arg)
2658 {
2659         return snd_pcm_oss_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2660 }
2661 #else
2662 #define snd_pcm_oss_ioctl_compat        NULL
2663 #endif
2664 
2665 static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
2666 {
2667         struct snd_pcm_oss_file *pcm_oss_file;
2668         struct snd_pcm_substream *substream;
2669 
2670         pcm_oss_file = file->private_data;
2671         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2672         if (substream == NULL)
2673                 return -ENXIO;
2674         substream->f_flags = file->f_flags & O_NONBLOCK;
2675 #ifndef OSS_DEBUG
2676         return snd_pcm_oss_read1(substream, buf, count);
2677 #else
2678         {
2679                 ssize_t res = snd_pcm_oss_read1(substream, buf, count);
2680                 pcm_dbg(substream->pcm,
2681                         "pcm_oss: read %li bytes (returned %li bytes)\n",
2682                         (long)count, (long)res);
2683                 return res;
2684         }
2685 #endif
2686 }
2687 
2688 static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
2689 {
2690         struct snd_pcm_oss_file *pcm_oss_file;
2691         struct snd_pcm_substream *substream;
2692         long result;
2693 
2694         pcm_oss_file = file->private_data;
2695         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2696         if (substream == NULL)
2697                 return -ENXIO;
2698         substream->f_flags = file->f_flags & O_NONBLOCK;
2699         result = snd_pcm_oss_write1(substream, buf, count);
2700 #ifdef OSS_DEBUG
2701         pcm_dbg(substream->pcm, "pcm_oss: write %li bytes (wrote %li bytes)\n",
2702                (long)count, (long)result);
2703 #endif
2704         return result;
2705 }
2706 
2707 static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)
2708 {
2709         struct snd_pcm_runtime *runtime = substream->runtime;
2710         if (atomic_read(&substream->mmap_count))
2711                 return runtime->oss.prev_hw_ptr_period !=
2712                                                 get_hw_ptr_period(runtime);
2713         else
2714                 return snd_pcm_playback_avail(runtime) >=
2715                                                 runtime->oss.period_frames;
2716 }
2717 
2718 static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)
2719 {
2720         struct snd_pcm_runtime *runtime = substream->runtime;
2721         if (atomic_read(&substream->mmap_count))
2722                 return runtime->oss.prev_hw_ptr_period !=
2723                                                 get_hw_ptr_period(runtime);
2724         else
2725                 return snd_pcm_capture_avail(runtime) >=
2726                                                 runtime->oss.period_frames;
2727 }
2728 
2729 static unsigned int snd_pcm_oss_poll(struct file *file, poll_table * wait)
2730 {
2731         struct snd_pcm_oss_file *pcm_oss_file;
2732         unsigned int mask;
2733         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2734         
2735         pcm_oss_file = file->private_data;
2736 
2737         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2738         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2739 
2740         mask = 0;
2741         if (psubstream != NULL) {
2742                 struct snd_pcm_runtime *runtime = psubstream->runtime;
2743                 poll_wait(file, &runtime->sleep, wait);
2744                 snd_pcm_stream_lock_irq(psubstream);
2745                 if (runtime->status->state != SNDRV_PCM_STATE_DRAINING &&
2746                     (runtime->status->state != SNDRV_PCM_STATE_RUNNING ||
2747                      snd_pcm_oss_playback_ready(psubstream)))
2748                         mask |= POLLOUT | POLLWRNORM;
2749                 snd_pcm_stream_unlock_irq(psubstream);
2750         }
2751         if (csubstream != NULL) {
2752                 struct snd_pcm_runtime *runtime = csubstream->runtime;
2753                 snd_pcm_state_t ostate;
2754                 poll_wait(file, &runtime->sleep, wait);
2755                 snd_pcm_stream_lock_irq(csubstream);
2756                 if ((ostate = runtime->status->state) != SNDRV_PCM_STATE_RUNNING ||
2757                     snd_pcm_oss_capture_ready(csubstream))
2758                         mask |= POLLIN | POLLRDNORM;
2759                 snd_pcm_stream_unlock_irq(csubstream);
2760                 if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) {
2761                         struct snd_pcm_oss_file ofile;
2762                         memset(&ofile, 0, sizeof(ofile));
2763                         ofile.streams[SNDRV_PCM_STREAM_CAPTURE] = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2764                         runtime->oss.trigger = 0;
2765                         snd_pcm_oss_set_trigger(&ofile, PCM_ENABLE_INPUT);
2766                 }
2767         }
2768 
2769         return mask;
2770 }
2771 
2772 static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area)
2773 {
2774         struct snd_pcm_oss_file *pcm_oss_file;
2775         struct snd_pcm_substream *substream = NULL;
2776         struct snd_pcm_runtime *runtime;
2777         int err;
2778 
2779 #ifdef OSS_DEBUG
2780         pr_debug("pcm_oss: mmap begin\n");
2781 #endif
2782         pcm_oss_file = file->private_data;
2783         switch ((area->vm_flags & (VM_READ | VM_WRITE))) {
2784         case VM_READ | VM_WRITE:
2785                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2786                 if (substream)
2787                         break;
2788                 /* Fall through */
2789         case VM_READ:
2790                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2791                 break;
2792         case VM_WRITE:
2793                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2794                 break;
2795         default:
2796                 return -EINVAL;
2797         }
2798         /* set VM_READ access as well to fix memset() routines that do
2799            reads before writes (to improve performance) */
2800         area->vm_flags |= VM_READ;
2801         if (substream == NULL)
2802                 return -ENXIO;
2803         runtime = substream->runtime;
2804         if (!(runtime->info & SNDRV_PCM_INFO_MMAP_VALID))
2805                 return -EIO;
2806         if (runtime->info & SNDRV_PCM_INFO_INTERLEAVED)
2807                 runtime->access = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2808         else
2809                 return -EIO;
2810         
2811         if (runtime->oss.params) {
2812                 /* use mutex_trylock() for params_lock for avoiding a deadlock
2813                  * between mmap_sem and params_lock taken by
2814                  * copy_from/to_user() in snd_pcm_oss_write/read()
2815                  */
2816                 err = snd_pcm_oss_change_params(substream, true);
2817                 if (err < 0)
2818                         return err;
2819         }
2820 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2821         if (runtime->oss.plugin_first != NULL)
2822                 return -EIO;
2823 #endif
2824 
2825         if (area->vm_pgoff != 0)
2826                 return -EINVAL;
2827 
2828         err = snd_pcm_mmap_data(substream, file, area);
2829         if (err < 0)
2830                 return err;
2831         runtime->oss.mmap_bytes = area->vm_end - area->vm_start;
2832         runtime->silence_threshold = 0;
2833         runtime->silence_size = 0;
2834 #ifdef OSS_DEBUG
2835         pr_debug("pcm_oss: mmap ok, bytes = 0x%x\n",
2836                runtime->oss.mmap_bytes);
2837 #endif
2838         /* In mmap mode we never stop */
2839         runtime->stop_threshold = runtime->boundary;
2840 
2841         return 0;
2842 }
2843 
2844 #ifdef CONFIG_SND_VERBOSE_PROCFS
2845 /*
2846  *  /proc interface
2847  */
2848 
2849 static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
2850                                   struct snd_info_buffer *buffer)
2851 {
2852         struct snd_pcm_str *pstr = entry->private_data;
2853         struct snd_pcm_oss_setup *setup = pstr->oss.setup_list;
2854         mutex_lock(&pstr->oss.setup_mutex);
2855         while (setup) {
2856                 snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s\n",
2857                             setup->task_name,
2858                             setup->periods,
2859                             setup->period_size,
2860                             setup->disable ? " disable" : "",
2861                             setup->direct ? " direct" : "",
2862                             setup->block ? " block" : "",
2863                             setup->nonblock ? " non-block" : "",
2864                             setup->partialfrag ? " partial-frag" : "",
2865                             setup->nosilence ? " no-silence" : "");
2866                 setup = setup->next;
2867         }
2868         mutex_unlock(&pstr->oss.setup_mutex);
2869 }
2870 
2871 static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)
2872 {
2873         struct snd_pcm_oss_setup *setup, *setupn;
2874 
2875         for (setup = pstr->oss.setup_list, pstr->oss.setup_list = NULL;
2876              setup; setup = setupn) {
2877                 setupn = setup->next;
2878                 kfree(setup->task_name);
2879                 kfree(setup);
2880         }
2881         pstr->oss.setup_list = NULL;
2882 }
2883 
2884 static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
2885                                    struct snd_info_buffer *buffer)
2886 {
2887         struct snd_pcm_str *pstr = entry->private_data;
2888         char line[128], str[32], task_name[32];
2889         const char *ptr;
2890         int idx1;
2891         struct snd_pcm_oss_setup *setup, *setup1, template;
2892 
2893         while (!snd_info_get_line(buffer, line, sizeof(line))) {
2894                 mutex_lock(&pstr->oss.setup_mutex);
2895                 memset(&template, 0, sizeof(template));
2896                 ptr = snd_info_get_str(task_name, line, sizeof(task_name));
2897                 if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) {
2898                         snd_pcm_oss_proc_free_setup_list(pstr);
2899                         mutex_unlock(&pstr->oss.setup_mutex);
2900                         continue;
2901                 }
2902                 for (setup = pstr->oss.setup_list; setup; setup = setup->next) {
2903                         if (!strcmp(setup->task_name, task_name)) {
2904                                 template = *setup;
2905                                 break;
2906                         }
2907                 }
2908                 ptr = snd_info_get_str(str, ptr, sizeof(str));
2909                 template.periods = simple_strtoul(str, NULL, 10);
2910                 ptr = snd_info_get_str(str, ptr, sizeof(str));
2911                 template.period_size = simple_strtoul(str, NULL, 10);
2912                 for (idx1 = 31; idx1 >= 0; idx1--)
2913                         if (template.period_size & (1 << idx1))
2914                                 break;
2915                 for (idx1--; idx1 >= 0; idx1--)
2916                         template.period_size &= ~(1 << idx1);
2917                 do {
2918                         ptr = snd_info_get_str(str, ptr, sizeof(str));
2919                         if (!strcmp(str, "disable")) {
2920                                 template.disable = 1;
2921                         } else if (!strcmp(str, "direct")) {
2922                                 template.direct = 1;
2923                         } else if (!strcmp(str, "block")) {
2924                                 template.block = 1;
2925                         } else if (!strcmp(str, "non-block")) {
2926                                 template.nonblock = 1;
2927                         } else if (!strcmp(str, "partial-frag")) {
2928                                 template.partialfrag = 1;
2929                         } else if (!strcmp(str, "no-silence")) {
2930                                 template.nosilence = 1;
2931                         } else if (!strcmp(str, "buggy-ptr")) {
2932                                 template.buggyptr = 1;
2933                         }
2934                 } while (*str);
2935                 if (setup == NULL) {
2936                         setup = kmalloc(sizeof(*setup), GFP_KERNEL);
2937                         if (! setup) {
2938                                 buffer->error = -ENOMEM;
2939                                 mutex_unlock(&pstr->oss.setup_mutex);
2940                                 return;
2941                         }
2942                         if (pstr->oss.setup_list == NULL)
2943                                 pstr->oss.setup_list = setup;
2944                         else {
2945                                 for (setup1 = pstr->oss.setup_list;
2946                                      setup1->next; setup1 = setup1->next);
2947                                 setup1->next = setup;
2948                         }
2949                         template.task_name = kstrdup(task_name, GFP_KERNEL);
2950                         if (! template.task_name) {
2951                                 kfree(setup);
2952                                 buffer->error = -ENOMEM;
2953                                 mutex_unlock(&pstr->oss.setup_mutex);
2954                                 return;
2955                         }
2956                 }
2957                 *setup = template;
2958                 mutex_unlock(&pstr->oss.setup_mutex);
2959         }
2960 }
2961 
2962 static void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
2963 {
2964         int stream;
2965         for (stream = 0; stream < 2; ++stream) {
2966                 struct snd_info_entry *entry;
2967                 struct snd_pcm_str *pstr = &pcm->streams[stream];
2968                 if (pstr->substream_count == 0)
2969                         continue;
2970                 if ((entry = snd_info_create_card_entry(pcm->card, "oss", pstr->proc_root)) != NULL) {
2971                         entry->content = SNDRV_INFO_CONTENT_TEXT;
2972                         entry->mode = S_IFREG | S_IRUGO | S_IWUSR;
2973                         entry->c.text.read = snd_pcm_oss_proc_read;
2974                         entry->c.text.write = snd_pcm_oss_proc_write;
2975                         entry->private_data = pstr;
2976                         if (snd_info_register(entry) < 0) {
2977                                 snd_info_free_entry(entry);
2978                                 entry = NULL;
2979                         }
2980                 }
2981                 pstr->oss.proc_entry = entry;
2982         }
2983 }
2984 
2985 static void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
2986 {
2987         int stream;
2988         for (stream = 0; stream < 2; ++stream) {
2989                 struct snd_pcm_str *pstr = &pcm->streams[stream];
2990                 snd_info_free_entry(pstr->oss.proc_entry);
2991                 pstr->oss.proc_entry = NULL;
2992                 snd_pcm_oss_proc_free_setup_list(pstr);
2993         }
2994 }
2995 #else /* !CONFIG_SND_VERBOSE_PROCFS */
2996 #define snd_pcm_oss_proc_init(pcm)
2997 #define snd_pcm_oss_proc_done(pcm)
2998 #endif /* CONFIG_SND_VERBOSE_PROCFS */
2999 
3000 /*
3001  *  ENTRY functions
3002  */
3003 
3004 static const struct file_operations snd_pcm_oss_f_reg =
3005 {
3006         .owner =        THIS_MODULE,
3007         .read =         snd_pcm_oss_read,
3008         .write =        snd_pcm_oss_write,
3009         .open =         snd_pcm_oss_open,
3010         .release =      snd_pcm_oss_release,
3011         .llseek =       no_llseek,
3012         .poll =         snd_pcm_oss_poll,
3013         .unlocked_ioctl =       snd_pcm_oss_ioctl,
3014         .compat_ioctl = snd_pcm_oss_ioctl_compat,
3015         .mmap =         snd_pcm_oss_mmap,
3016 };
3017 
3018 static void register_oss_dsp(struct snd_pcm *pcm, int index)
3019 {
3020         if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3021                                     pcm->card, index, &snd_pcm_oss_f_reg,
3022                                     pcm) < 0) {
3023                 pcm_err(pcm, "unable to register OSS PCM device %i:%i\n",
3024                            pcm->card->number, pcm->device);
3025         }
3026 }
3027 
3028 static int snd_pcm_oss_register_minor(struct snd_pcm *pcm)
3029 {
3030         pcm->oss.reg = 0;
3031         if (dsp_map[pcm->card->number] == (int)pcm->device) {
3032                 char name[128];
3033                 int duplex;
3034                 register_oss_dsp(pcm, 0);
3035                 duplex = (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count > 0 && 
3036                               pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count && 
3037                               !(pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX));
3038                 sprintf(name, "%s%s", pcm->name, duplex ? " (DUPLEX)" : "");
3039 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3040                 snd_oss_info_register(SNDRV_OSS_INFO_DEV_AUDIO,
3041                                       pcm->card->number,
3042                                       name);
3043 #endif
3044                 pcm->oss.reg++;
3045                 pcm->oss.reg_mask |= 1;
3046         }
3047         if (adsp_map[pcm->card->number] == (int)pcm->device) {
3048                 register_oss_dsp(pcm, 1);
3049                 pcm->oss.reg++;
3050                 pcm->oss.reg_mask |= 2;
3051         }
3052 
3053         if (pcm->oss.reg)
3054                 snd_pcm_oss_proc_init(pcm);
3055 
3056         return 0;
3057 }
3058 
3059 static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm)
3060 {
3061         if (pcm->oss.reg) {
3062                 if (pcm->oss.reg_mask & 1) {
3063                         pcm->oss.reg_mask &= ~1;
3064                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3065                                                   pcm->card, 0);
3066                 }
3067                 if (pcm->oss.reg_mask & 2) {
3068                         pcm->oss.reg_mask &= ~2;
3069                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3070                                                   pcm->card, 1);
3071                 }
3072                 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3073 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3074                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number);
3075 #endif
3076                 }
3077                 pcm->oss.reg = 0;
3078         }
3079         return 0;
3080 }
3081 
3082 static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm)
3083 {
3084         snd_pcm_oss_disconnect_minor(pcm);
3085         snd_pcm_oss_proc_done(pcm);
3086         return 0;
3087 }
3088 
3089 static struct snd_pcm_notify snd_pcm_oss_notify =
3090 {
3091         .n_register =   snd_pcm_oss_register_minor,
3092         .n_disconnect = snd_pcm_oss_disconnect_minor,
3093         .n_unregister = snd_pcm_oss_unregister_minor,
3094 };
3095 
3096 static int __init alsa_pcm_oss_init(void)
3097 {
3098         int i;
3099         int err;
3100 
3101         /* check device map table */
3102         for (i = 0; i < SNDRV_CARDS; i++) {
3103                 if (dsp_map[i] < 0 || dsp_map[i] >= SNDRV_PCM_DEVICES) {
3104                         pr_err("ALSA: pcm_oss: invalid dsp_map[%d] = %d\n",
3105                                    i, dsp_map[i]);
3106                         dsp_map[i] = 0;
3107                 }
3108                 if (adsp_map[i] < 0 || adsp_map[i] >= SNDRV_PCM_DEVICES) {
3109                         pr_err("ALSA: pcm_oss: invalid adsp_map[%d] = %d\n",
3110                                    i, adsp_map[i]);
3111                         adsp_map[i] = 1;
3112                 }
3113         }
3114         if ((err = snd_pcm_notify(&snd_pcm_oss_notify, 0)) < 0)
3115                 return err;
3116         return 0;
3117 }
3118 
3119 static void __exit alsa_pcm_oss_exit(void)
3120 {
3121         snd_pcm_notify(&snd_pcm_oss_notify, 1);
3122 }
3123 
3124 module_init(alsa_pcm_oss_init)
3125 module_exit(alsa_pcm_oss_exit)
3126 

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