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/time.h>
32 #include <linux/vmalloc.h>
33 #include <linux/module.h>
34 #include <linux/math64.h>
35 #include <linux/string.h>
36 #include <sound/core.h>
37 #include <sound/minors.h>
38 #include <sound/pcm.h>
39 #include <sound/pcm_params.h>
40 #include "pcm_plugin.h"
41 #include <sound/info.h>
42 #include <linux/soundcard.h>
43 #include <sound/initval.h>
44 #include <sound/mixer_oss.h>
45
46 #define OSS_ALSAEMULVER _SIOR ('M', 249, int)
47
48 static int dsp_map[SNDRV_CARDS];
49 static int adsp_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
50 static bool nonblock_open = 1;
51
52 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
53 MODULE_DESCRIPTION("PCM OSS emulation for ALSA.");
54 MODULE_LICENSE("GPL");
55 module_param_array(dsp_map, int, NULL, 0444);
56 MODULE_PARM_DESC(dsp_map, "PCM device number assigned to 1st OSS device.");
57 module_param_array(adsp_map, int, NULL, 0444);
58 MODULE_PARM_DESC(adsp_map, "PCM device number assigned to 2nd OSS device.");
59 module_param(nonblock_open, bool, 0644);
60 MODULE_PARM_DESC(nonblock_open, "Don't block opening busy PCM devices.");
61 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM);
62 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM1);
63
64 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file);
65 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file);
66 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file);
67
snd_enter_user(void)68 static inline mm_segment_t snd_enter_user(void)
69 {
70 mm_segment_t fs = get_fs();
71 set_fs(get_ds());
72 return fs;
73 }
74
snd_leave_user(mm_segment_t fs)75 static inline void snd_leave_user(mm_segment_t fs)
76 {
77 set_fs(fs);
78 }
79
80 /*
81 * helper functions to process hw_params
82 */
snd_interval_refine_min(struct snd_interval * i,unsigned int min,int openmin)83 static int snd_interval_refine_min(struct snd_interval *i, unsigned int min, int openmin)
84 {
85 int changed = 0;
86 if (i->min < min) {
87 i->min = min;
88 i->openmin = openmin;
89 changed = 1;
90 } else if (i->min == min && !i->openmin && openmin) {
91 i->openmin = 1;
92 changed = 1;
93 }
94 if (i->integer) {
95 if (i->openmin) {
96 i->min++;
97 i->openmin = 0;
98 }
99 }
100 if (snd_interval_checkempty(i)) {
101 snd_interval_none(i);
102 return -EINVAL;
103 }
104 return changed;
105 }
106
snd_interval_refine_max(struct snd_interval * i,unsigned int max,int openmax)107 static int snd_interval_refine_max(struct snd_interval *i, unsigned int max, int openmax)
108 {
109 int changed = 0;
110 if (i->max > max) {
111 i->max = max;
112 i->openmax = openmax;
113 changed = 1;
114 } else if (i->max == max && !i->openmax && openmax) {
115 i->openmax = 1;
116 changed = 1;
117 }
118 if (i->integer) {
119 if (i->openmax) {
120 i->max--;
121 i->openmax = 0;
122 }
123 }
124 if (snd_interval_checkempty(i)) {
125 snd_interval_none(i);
126 return -EINVAL;
127 }
128 return changed;
129 }
130
snd_interval_refine_set(struct snd_interval * i,unsigned int val)131 static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
132 {
133 struct snd_interval t;
134 t.empty = 0;
135 t.min = t.max = val;
136 t.openmin = t.openmax = 0;
137 t.integer = 1;
138 return snd_interval_refine(i, &t);
139 }
140
141 /**
142 * snd_pcm_hw_param_value_min
143 * @params: the hw_params instance
144 * @var: parameter to retrieve
145 * @dir: pointer to the direction (-1,0,1) or NULL
146 *
147 * Return the minimum value for field PAR.
148 */
149 static unsigned int
snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,int * dir)150 snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params *params,
151 snd_pcm_hw_param_t var, int *dir)
152 {
153 if (hw_is_mask(var)) {
154 if (dir)
155 *dir = 0;
156 return snd_mask_min(hw_param_mask_c(params, var));
157 }
158 if (hw_is_interval(var)) {
159 const struct snd_interval *i = hw_param_interval_c(params, var);
160 if (dir)
161 *dir = i->openmin;
162 return snd_interval_min(i);
163 }
164 return -EINVAL;
165 }
166
167 /**
168 * snd_pcm_hw_param_value_max
169 * @params: the hw_params instance
170 * @var: parameter to retrieve
171 * @dir: pointer to the direction (-1,0,1) or NULL
172 *
173 * Return the maximum value for field PAR.
174 */
175 static unsigned int
snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,int * dir)176 snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params *params,
177 snd_pcm_hw_param_t var, int *dir)
178 {
179 if (hw_is_mask(var)) {
180 if (dir)
181 *dir = 0;
182 return snd_mask_max(hw_param_mask_c(params, var));
183 }
184 if (hw_is_interval(var)) {
185 const struct snd_interval *i = hw_param_interval_c(params, var);
186 if (dir)
187 *dir = - (int) i->openmax;
188 return snd_interval_max(i);
189 }
190 return -EINVAL;
191 }
192
_snd_pcm_hw_param_mask(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,const struct snd_mask * val)193 static int _snd_pcm_hw_param_mask(struct snd_pcm_hw_params *params,
194 snd_pcm_hw_param_t var,
195 const struct snd_mask *val)
196 {
197 int changed;
198 changed = snd_mask_refine(hw_param_mask(params, var), val);
199 if (changed) {
200 params->cmask |= 1 << var;
201 params->rmask |= 1 << var;
202 }
203 return changed;
204 }
205
snd_pcm_hw_param_mask(struct snd_pcm_substream * pcm,struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,const struct snd_mask * val)206 static int snd_pcm_hw_param_mask(struct snd_pcm_substream *pcm,
207 struct snd_pcm_hw_params *params,
208 snd_pcm_hw_param_t var,
209 const struct snd_mask *val)
210 {
211 int changed = _snd_pcm_hw_param_mask(params, var, val);
212 if (changed < 0)
213 return changed;
214 if (params->rmask) {
215 int err = snd_pcm_hw_refine(pcm, params);
216 if (err < 0)
217 return err;
218 }
219 return 0;
220 }
221
_snd_pcm_hw_param_min(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int val,int dir)222 static int _snd_pcm_hw_param_min(struct snd_pcm_hw_params *params,
223 snd_pcm_hw_param_t var, unsigned int val,
224 int dir)
225 {
226 int changed;
227 int open = 0;
228 if (dir) {
229 if (dir > 0) {
230 open = 1;
231 } else if (dir < 0) {
232 if (val > 0) {
233 open = 1;
234 val--;
235 }
236 }
237 }
238 if (hw_is_mask(var))
239 changed = snd_mask_refine_min(hw_param_mask(params, var),
240 val + !!open);
241 else if (hw_is_interval(var))
242 changed = snd_interval_refine_min(hw_param_interval(params, var),
243 val, open);
244 else
245 return -EINVAL;
246 if (changed) {
247 params->cmask |= 1 << var;
248 params->rmask |= 1 << var;
249 }
250 return changed;
251 }
252
253 /**
254 * snd_pcm_hw_param_min
255 * @pcm: PCM instance
256 * @params: the hw_params instance
257 * @var: parameter to retrieve
258 * @val: minimal value
259 * @dir: pointer to the direction (-1,0,1) or NULL
260 *
261 * Inside configuration space defined by PARAMS remove from PAR all
262 * values < VAL. Reduce configuration space accordingly.
263 * Return new minimum or -EINVAL if the configuration space is empty
264 */
snd_pcm_hw_param_min(struct snd_pcm_substream * pcm,struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int val,int * dir)265 static int snd_pcm_hw_param_min(struct snd_pcm_substream *pcm,
266 struct snd_pcm_hw_params *params,
267 snd_pcm_hw_param_t var, unsigned int val,
268 int *dir)
269 {
270 int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
271 if (changed < 0)
272 return changed;
273 if (params->rmask) {
274 int err = snd_pcm_hw_refine(pcm, params);
275 if (err < 0)
276 return err;
277 }
278 return snd_pcm_hw_param_value_min(params, var, dir);
279 }
280
_snd_pcm_hw_param_max(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int val,int dir)281 static int _snd_pcm_hw_param_max(struct snd_pcm_hw_params *params,
282 snd_pcm_hw_param_t var, unsigned int val,
283 int dir)
284 {
285 int changed;
286 int open = 0;
287 if (dir) {
288 if (dir < 0) {
289 open = 1;
290 } else if (dir > 0) {
291 open = 1;
292 val++;
293 }
294 }
295 if (hw_is_mask(var)) {
296 if (val == 0 && open) {
297 snd_mask_none(hw_param_mask(params, var));
298 changed = -EINVAL;
299 } else
300 changed = snd_mask_refine_max(hw_param_mask(params, var),
301 val - !!open);
302 } else if (hw_is_interval(var))
303 changed = snd_interval_refine_max(hw_param_interval(params, var),
304 val, open);
305 else
306 return -EINVAL;
307 if (changed) {
308 params->cmask |= 1 << var;
309 params->rmask |= 1 << var;
310 }
311 return changed;
312 }
313
314 /**
315 * snd_pcm_hw_param_max
316 * @pcm: PCM instance
317 * @params: the hw_params instance
318 * @var: parameter to retrieve
319 * @val: maximal value
320 * @dir: pointer to the direction (-1,0,1) or NULL
321 *
322 * Inside configuration space defined by PARAMS remove from PAR all
323 * values >= VAL + 1. Reduce configuration space accordingly.
324 * Return new maximum or -EINVAL if the configuration space is empty
325 */
snd_pcm_hw_param_max(struct snd_pcm_substream * pcm,struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int val,int * dir)326 static int snd_pcm_hw_param_max(struct snd_pcm_substream *pcm,
327 struct snd_pcm_hw_params *params,
328 snd_pcm_hw_param_t var, unsigned int val,
329 int *dir)
330 {
331 int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
332 if (changed < 0)
333 return changed;
334 if (params->rmask) {
335 int err = snd_pcm_hw_refine(pcm, params);
336 if (err < 0)
337 return err;
338 }
339 return snd_pcm_hw_param_value_max(params, var, dir);
340 }
341
boundary_sub(int a,int adir,int b,int bdir,int * c,int * cdir)342 static int boundary_sub(int a, int adir,
343 int b, int bdir,
344 int *c, int *cdir)
345 {
346 adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
347 bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
348 *c = a - b;
349 *cdir = adir - bdir;
350 if (*cdir == -2) {
351 (*c)--;
352 } else if (*cdir == 2) {
353 (*c)++;
354 }
355 return 0;
356 }
357
boundary_lt(unsigned int a,int adir,unsigned int b,int bdir)358 static int boundary_lt(unsigned int a, int adir,
359 unsigned int b, int bdir)
360 {
361 if (adir < 0) {
362 a--;
363 adir = 1;
364 } else if (adir > 0)
365 adir = 1;
366 if (bdir < 0) {
367 b--;
368 bdir = 1;
369 } else if (bdir > 0)
370 bdir = 1;
371 return a < b || (a == b && adir < bdir);
372 }
373
374 /* Return 1 if min is nearer to best than max */
boundary_nearer(int min,int mindir,int best,int bestdir,int max,int maxdir)375 static int boundary_nearer(int min, int mindir,
376 int best, int bestdir,
377 int max, int maxdir)
378 {
379 int dmin, dmindir;
380 int dmax, dmaxdir;
381 boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
382 boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
383 return boundary_lt(dmin, dmindir, dmax, dmaxdir);
384 }
385
386 /**
387 * snd_pcm_hw_param_near
388 * @pcm: PCM instance
389 * @params: the hw_params instance
390 * @var: parameter to retrieve
391 * @best: value to set
392 * @dir: pointer to the direction (-1,0,1) or NULL
393 *
394 * Inside configuration space defined by PARAMS set PAR to the available value
395 * nearest to VAL. Reduce configuration space accordingly.
396 * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
397 * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
398 * Return the value found.
399 */
snd_pcm_hw_param_near(struct snd_pcm_substream * pcm,struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int best,int * dir)400 static int snd_pcm_hw_param_near(struct snd_pcm_substream *pcm,
401 struct snd_pcm_hw_params *params,
402 snd_pcm_hw_param_t var, unsigned int best,
403 int *dir)
404 {
405 struct snd_pcm_hw_params *save = NULL;
406 int v;
407 unsigned int saved_min;
408 int last = 0;
409 int min, max;
410 int mindir, maxdir;
411 int valdir = dir ? *dir : 0;
412 /* FIXME */
413 if (best > INT_MAX)
414 best = INT_MAX;
415 min = max = best;
416 mindir = maxdir = valdir;
417 if (maxdir > 0)
418 maxdir = 0;
419 else if (maxdir == 0)
420 maxdir = -1;
421 else {
422 maxdir = 1;
423 max--;
424 }
425 save = kmalloc(sizeof(*save), GFP_KERNEL);
426 if (save == NULL)
427 return -ENOMEM;
428 *save = *params;
429 saved_min = min;
430 min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
431 if (min >= 0) {
432 struct snd_pcm_hw_params *params1;
433 if (max < 0)
434 goto _end;
435 if ((unsigned int)min == saved_min && mindir == valdir)
436 goto _end;
437 params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
438 if (params1 == NULL) {
439 kfree(save);
440 return -ENOMEM;
441 }
442 *params1 = *save;
443 max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
444 if (max < 0) {
445 kfree(params1);
446 goto _end;
447 }
448 if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
449 *params = *params1;
450 last = 1;
451 }
452 kfree(params1);
453 } else {
454 *params = *save;
455 max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
456 if (max < 0) {
457 kfree(save);
458 return max;
459 }
460 last = 1;
461 }
462 _end:
463 kfree(save);
464 if (last)
465 v = snd_pcm_hw_param_last(pcm, params, var, dir);
466 else
467 v = snd_pcm_hw_param_first(pcm, params, var, dir);
468 snd_BUG_ON(v < 0);
469 return v;
470 }
471
_snd_pcm_hw_param_set(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int val,int dir)472 static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
473 snd_pcm_hw_param_t var, unsigned int val,
474 int dir)
475 {
476 int changed;
477 if (hw_is_mask(var)) {
478 struct snd_mask *m = hw_param_mask(params, var);
479 if (val == 0 && dir < 0) {
480 changed = -EINVAL;
481 snd_mask_none(m);
482 } else {
483 if (dir > 0)
484 val++;
485 else if (dir < 0)
486 val--;
487 changed = snd_mask_refine_set(hw_param_mask(params, var), val);
488 }
489 } else if (hw_is_interval(var)) {
490 struct snd_interval *i = hw_param_interval(params, var);
491 if (val == 0 && dir < 0) {
492 changed = -EINVAL;
493 snd_interval_none(i);
494 } else if (dir == 0)
495 changed = snd_interval_refine_set(i, val);
496 else {
497 struct snd_interval t;
498 t.openmin = 1;
499 t.openmax = 1;
500 t.empty = 0;
501 t.integer = 0;
502 if (dir < 0) {
503 t.min = val - 1;
504 t.max = val;
505 } else {
506 t.min = val;
507 t.max = val+1;
508 }
509 changed = snd_interval_refine(i, &t);
510 }
511 } else
512 return -EINVAL;
513 if (changed) {
514 params->cmask |= 1 << var;
515 params->rmask |= 1 << var;
516 }
517 return changed;
518 }
519
520 /**
521 * snd_pcm_hw_param_set
522 * @pcm: PCM instance
523 * @params: the hw_params instance
524 * @var: parameter to retrieve
525 * @val: value to set
526 * @dir: pointer to the direction (-1,0,1) or NULL
527 *
528 * Inside configuration space defined by PARAMS remove from PAR all
529 * values != VAL. Reduce configuration space accordingly.
530 * Return VAL or -EINVAL if the configuration space is empty
531 */
snd_pcm_hw_param_set(struct snd_pcm_substream * pcm,struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int val,int dir)532 static int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm,
533 struct snd_pcm_hw_params *params,
534 snd_pcm_hw_param_t var, unsigned int val,
535 int dir)
536 {
537 int changed = _snd_pcm_hw_param_set(params, var, val, dir);
538 if (changed < 0)
539 return changed;
540 if (params->rmask) {
541 int err = snd_pcm_hw_refine(pcm, params);
542 if (err < 0)
543 return err;
544 }
545 return snd_pcm_hw_param_value(params, var, NULL);
546 }
547
_snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var)548 static int _snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params *params,
549 snd_pcm_hw_param_t var)
550 {
551 int changed;
552 changed = snd_interval_setinteger(hw_param_interval(params, var));
553 if (changed) {
554 params->cmask |= 1 << var;
555 params->rmask |= 1 << var;
556 }
557 return changed;
558 }
559
560 /*
561 * plugin
562 */
563
564 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
snd_pcm_oss_plugin_clear(struct snd_pcm_substream * substream)565 static int snd_pcm_oss_plugin_clear(struct snd_pcm_substream *substream)
566 {
567 struct snd_pcm_runtime *runtime = substream->runtime;
568 struct snd_pcm_plugin *plugin, *next;
569
570 plugin = runtime->oss.plugin_first;
571 while (plugin) {
572 next = plugin->next;
573 snd_pcm_plugin_free(plugin);
574 plugin = next;
575 }
576 runtime->oss.plugin_first = runtime->oss.plugin_last = NULL;
577 return 0;
578 }
579
snd_pcm_plugin_insert(struct snd_pcm_plugin * plugin)580 static int snd_pcm_plugin_insert(struct snd_pcm_plugin *plugin)
581 {
582 struct snd_pcm_runtime *runtime = plugin->plug->runtime;
583 plugin->next = runtime->oss.plugin_first;
584 plugin->prev = NULL;
585 if (runtime->oss.plugin_first) {
586 runtime->oss.plugin_first->prev = plugin;
587 runtime->oss.plugin_first = plugin;
588 } else {
589 runtime->oss.plugin_last =
590 runtime->oss.plugin_first = plugin;
591 }
592 return 0;
593 }
594
snd_pcm_plugin_append(struct snd_pcm_plugin * plugin)595 int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin)
596 {
597 struct snd_pcm_runtime *runtime = plugin->plug->runtime;
598 plugin->next = NULL;
599 plugin->prev = runtime->oss.plugin_last;
600 if (runtime->oss.plugin_last) {
601 runtime->oss.plugin_last->next = plugin;
602 runtime->oss.plugin_last = plugin;
603 } else {
604 runtime->oss.plugin_last =
605 runtime->oss.plugin_first = plugin;
606 }
607 return 0;
608 }
609 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
610
snd_pcm_oss_bytes(struct snd_pcm_substream * substream,long frames)611 static long snd_pcm_oss_bytes(struct snd_pcm_substream *substream, long frames)
612 {
613 struct snd_pcm_runtime *runtime = substream->runtime;
614 long buffer_size = snd_pcm_lib_buffer_bytes(substream);
615 long bytes = frames_to_bytes(runtime, frames);
616 if (buffer_size == runtime->oss.buffer_bytes)
617 return bytes;
618 #if BITS_PER_LONG >= 64
619 return runtime->oss.buffer_bytes * bytes / buffer_size;
620 #else
621 {
622 u64 bsize = (u64)runtime->oss.buffer_bytes * (u64)bytes;
623 return div_u64(bsize, buffer_size);
624 }
625 #endif
626 }
627
snd_pcm_alsa_frames(struct snd_pcm_substream * substream,long bytes)628 static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes)
629 {
630 struct snd_pcm_runtime *runtime = substream->runtime;
631 long buffer_size = snd_pcm_lib_buffer_bytes(substream);
632 if (buffer_size == runtime->oss.buffer_bytes)
633 return bytes_to_frames(runtime, bytes);
634 return bytes_to_frames(runtime, (buffer_size * bytes) / runtime->oss.buffer_bytes);
635 }
636
637 static inline
get_hw_ptr_period(struct snd_pcm_runtime * runtime)638 snd_pcm_uframes_t get_hw_ptr_period(struct snd_pcm_runtime *runtime)
639 {
640 return runtime->hw_ptr_interrupt;
641 }
642
643 /* define extended formats in the recent OSS versions (if any) */
644 /* linear formats */
645 #define AFMT_S32_LE 0x00001000
646 #define AFMT_S32_BE 0x00002000
647 #define AFMT_S24_LE 0x00008000
648 #define AFMT_S24_BE 0x00010000
649 #define AFMT_S24_PACKED 0x00040000
650
651 /* other supported formats */
652 #define AFMT_FLOAT 0x00004000
653 #define AFMT_SPDIF_RAW 0x00020000
654
655 /* unsupported formats */
656 #define AFMT_AC3 0x00000400
657 #define AFMT_VORBIS 0x00000800
658
snd_pcm_oss_format_from(int format)659 static snd_pcm_format_t snd_pcm_oss_format_from(int format)
660 {
661 switch (format) {
662 case AFMT_MU_LAW: return SNDRV_PCM_FORMAT_MU_LAW;
663 case AFMT_A_LAW: return SNDRV_PCM_FORMAT_A_LAW;
664 case AFMT_IMA_ADPCM: return SNDRV_PCM_FORMAT_IMA_ADPCM;
665 case AFMT_U8: return SNDRV_PCM_FORMAT_U8;
666 case AFMT_S16_LE: return SNDRV_PCM_FORMAT_S16_LE;
667 case AFMT_S16_BE: return SNDRV_PCM_FORMAT_S16_BE;
668 case AFMT_S8: return SNDRV_PCM_FORMAT_S8;
669 case AFMT_U16_LE: return SNDRV_PCM_FORMAT_U16_LE;
670 case AFMT_U16_BE: return SNDRV_PCM_FORMAT_U16_BE;
671 case AFMT_MPEG: return SNDRV_PCM_FORMAT_MPEG;
672 case AFMT_S32_LE: return SNDRV_PCM_FORMAT_S32_LE;
673 case AFMT_S32_BE: return SNDRV_PCM_FORMAT_S32_BE;
674 case AFMT_S24_LE: return SNDRV_PCM_FORMAT_S24_LE;
675 case AFMT_S24_BE: return SNDRV_PCM_FORMAT_S24_BE;
676 case AFMT_S24_PACKED: return SNDRV_PCM_FORMAT_S24_3LE;
677 case AFMT_FLOAT: return SNDRV_PCM_FORMAT_FLOAT;
678 case AFMT_SPDIF_RAW: return SNDRV_PCM_FORMAT_IEC958_SUBFRAME;
679 default: return SNDRV_PCM_FORMAT_U8;
680 }
681 }
682
snd_pcm_oss_format_to(snd_pcm_format_t format)683 static int snd_pcm_oss_format_to(snd_pcm_format_t format)
684 {
685 switch (format) {
686 case SNDRV_PCM_FORMAT_MU_LAW: return AFMT_MU_LAW;
687 case SNDRV_PCM_FORMAT_A_LAW: return AFMT_A_LAW;
688 case SNDRV_PCM_FORMAT_IMA_ADPCM: return AFMT_IMA_ADPCM;
689 case SNDRV_PCM_FORMAT_U8: return AFMT_U8;
690 case SNDRV_PCM_FORMAT_S16_LE: return AFMT_S16_LE;
691 case SNDRV_PCM_FORMAT_S16_BE: return AFMT_S16_BE;
692 case SNDRV_PCM_FORMAT_S8: return AFMT_S8;
693 case SNDRV_PCM_FORMAT_U16_LE: return AFMT_U16_LE;
694 case SNDRV_PCM_FORMAT_U16_BE: return AFMT_U16_BE;
695 case SNDRV_PCM_FORMAT_MPEG: return AFMT_MPEG;
696 case SNDRV_PCM_FORMAT_S32_LE: return AFMT_S32_LE;
697 case SNDRV_PCM_FORMAT_S32_BE: return AFMT_S32_BE;
698 case SNDRV_PCM_FORMAT_S24_LE: return AFMT_S24_LE;
699 case SNDRV_PCM_FORMAT_S24_BE: return AFMT_S24_BE;
700 case SNDRV_PCM_FORMAT_S24_3LE: return AFMT_S24_PACKED;
701 case SNDRV_PCM_FORMAT_FLOAT: return AFMT_FLOAT;
702 case SNDRV_PCM_FORMAT_IEC958_SUBFRAME: return AFMT_SPDIF_RAW;
703 default: return -EINVAL;
704 }
705 }
706
snd_pcm_oss_period_size(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * oss_params,struct snd_pcm_hw_params * slave_params)707 static int snd_pcm_oss_period_size(struct snd_pcm_substream *substream,
708 struct snd_pcm_hw_params *oss_params,
709 struct snd_pcm_hw_params *slave_params)
710 {
711 size_t s;
712 size_t oss_buffer_size, oss_period_size, oss_periods;
713 size_t min_period_size, max_period_size;
714 struct snd_pcm_runtime *runtime = substream->runtime;
715 size_t oss_frame_size;
716
717 oss_frame_size = snd_pcm_format_physical_width(params_format(oss_params)) *
718 params_channels(oss_params) / 8;
719
720 oss_buffer_size = snd_pcm_plug_client_size(substream,
721 snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, NULL)) * oss_frame_size;
722 oss_buffer_size = rounddown_pow_of_two(oss_buffer_size);
723 if (atomic_read(&substream->mmap_count)) {
724 if (oss_buffer_size > runtime->oss.mmap_bytes)
725 oss_buffer_size = runtime->oss.mmap_bytes;
726 }
727
728 if (substream->oss.setup.period_size > 16)
729 oss_period_size = substream->oss.setup.period_size;
730 else if (runtime->oss.fragshift) {
731 oss_period_size = 1 << runtime->oss.fragshift;
732 if (oss_period_size > oss_buffer_size / 2)
733 oss_period_size = oss_buffer_size / 2;
734 } else {
735 int sd;
736 size_t bytes_per_sec = params_rate(oss_params) * snd_pcm_format_physical_width(params_format(oss_params)) * params_channels(oss_params) / 8;
737
738 oss_period_size = oss_buffer_size;
739 do {
740 oss_period_size /= 2;
741 } while (oss_period_size > bytes_per_sec);
742 if (runtime->oss.subdivision == 0) {
743 sd = 4;
744 if (oss_period_size / sd > 4096)
745 sd *= 2;
746 if (oss_period_size / sd < 4096)
747 sd = 1;
748 } else
749 sd = runtime->oss.subdivision;
750 oss_period_size /= sd;
751 if (oss_period_size < 16)
752 oss_period_size = 16;
753 }
754
755 min_period_size = snd_pcm_plug_client_size(substream,
756 snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
757 min_period_size *= oss_frame_size;
758 min_period_size = roundup_pow_of_two(min_period_size);
759 if (oss_period_size < min_period_size)
760 oss_period_size = min_period_size;
761
762 max_period_size = snd_pcm_plug_client_size(substream,
763 snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
764 max_period_size *= oss_frame_size;
765 max_period_size = rounddown_pow_of_two(max_period_size);
766 if (oss_period_size > max_period_size)
767 oss_period_size = max_period_size;
768
769 oss_periods = oss_buffer_size / oss_period_size;
770
771 if (substream->oss.setup.periods > 1)
772 oss_periods = substream->oss.setup.periods;
773
774 s = snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
775 if (runtime->oss.maxfrags && s > runtime->oss.maxfrags)
776 s = runtime->oss.maxfrags;
777 if (oss_periods > s)
778 oss_periods = s;
779
780 s = snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
781 if (s < 2)
782 s = 2;
783 if (oss_periods < s)
784 oss_periods = s;
785
786 while (oss_period_size * oss_periods > oss_buffer_size)
787 oss_period_size /= 2;
788
789 if (oss_period_size < 16)
790 return -EINVAL;
791 runtime->oss.period_bytes = oss_period_size;
792 runtime->oss.period_frames = 1;
793 runtime->oss.periods = oss_periods;
794 return 0;
795 }
796
choose_rate(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,unsigned int best_rate)797 static int choose_rate(struct snd_pcm_substream *substream,
798 struct snd_pcm_hw_params *params, unsigned int best_rate)
799 {
800 struct snd_interval *it;
801 struct snd_pcm_hw_params *save;
802 unsigned int rate, prev;
803
804 save = kmalloc(sizeof(*save), GFP_KERNEL);
805 if (save == NULL)
806 return -ENOMEM;
807 *save = *params;
808 it = hw_param_interval(save, SNDRV_PCM_HW_PARAM_RATE);
809
810 /* try multiples of the best rate */
811 rate = best_rate;
812 for (;;) {
813 if (it->max < rate || (it->max == rate && it->openmax))
814 break;
815 if (it->min < rate || (it->min == rate && !it->openmin)) {
816 int ret;
817 ret = snd_pcm_hw_param_set(substream, params,
818 SNDRV_PCM_HW_PARAM_RATE,
819 rate, 0);
820 if (ret == (int)rate) {
821 kfree(save);
822 return rate;
823 }
824 *params = *save;
825 }
826 prev = rate;
827 rate += best_rate;
828 if (rate <= prev)
829 break;
830 }
831
832 /* not found, use the nearest rate */
833 kfree(save);
834 return snd_pcm_hw_param_near(substream, params, SNDRV_PCM_HW_PARAM_RATE, best_rate, NULL);
835 }
836
snd_pcm_oss_change_params(struct snd_pcm_substream * substream,bool trylock)837 static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
838 bool trylock)
839 {
840 struct snd_pcm_runtime *runtime = substream->runtime;
841 struct snd_pcm_hw_params *params, *sparams;
842 struct snd_pcm_sw_params *sw_params;
843 ssize_t oss_buffer_size, oss_period_size;
844 size_t oss_frame_size;
845 int err;
846 int direct;
847 snd_pcm_format_t format, sformat;
848 int n;
849 struct snd_mask sformat_mask;
850 struct snd_mask mask;
851
852 if (trylock) {
853 if (!(mutex_trylock(&runtime->oss.params_lock)))
854 return -EAGAIN;
855 } else if (mutex_lock_interruptible(&runtime->oss.params_lock))
856 return -EINTR;
857 sw_params = kmalloc(sizeof(*sw_params), GFP_KERNEL);
858 params = kmalloc(sizeof(*params), GFP_KERNEL);
859 sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
860 if (!sw_params || !params || !sparams) {
861 err = -ENOMEM;
862 goto failure;
863 }
864
865 if (atomic_read(&substream->mmap_count))
866 direct = 1;
867 else
868 direct = substream->oss.setup.direct;
869
870 _snd_pcm_hw_params_any(sparams);
871 _snd_pcm_hw_param_setinteger(sparams, SNDRV_PCM_HW_PARAM_PERIODS);
872 _snd_pcm_hw_param_min(sparams, SNDRV_PCM_HW_PARAM_PERIODS, 2, 0);
873 snd_mask_none(&mask);
874 if (atomic_read(&substream->mmap_count))
875 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
876 else {
877 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED);
878 if (!direct)
879 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
880 }
881 err = snd_pcm_hw_param_mask(substream, sparams, SNDRV_PCM_HW_PARAM_ACCESS, &mask);
882 if (err < 0) {
883 pcm_dbg(substream->pcm, "No usable accesses\n");
884 err = -EINVAL;
885 goto failure;
886 }
887 choose_rate(substream, sparams, runtime->oss.rate);
888 snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_CHANNELS, runtime->oss.channels, NULL);
889
890 format = snd_pcm_oss_format_from(runtime->oss.format);
891
892 sformat_mask = *hw_param_mask(sparams, SNDRV_PCM_HW_PARAM_FORMAT);
893 if (direct)
894 sformat = format;
895 else
896 sformat = snd_pcm_plug_slave_format(format, &sformat_mask);
897
898 if ((__force int)sformat < 0 ||
899 !snd_mask_test(&sformat_mask, (__force int)sformat)) {
900 for (sformat = (__force snd_pcm_format_t)0;
901 (__force int)sformat <= (__force int)SNDRV_PCM_FORMAT_LAST;
902 sformat = (__force snd_pcm_format_t)((__force int)sformat + 1)) {
903 if (snd_mask_test(&sformat_mask, (__force int)sformat) &&
904 snd_pcm_oss_format_to(sformat) >= 0)
905 break;
906 }
907 if ((__force int)sformat > (__force int)SNDRV_PCM_FORMAT_LAST) {
908 pcm_dbg(substream->pcm, "Cannot find a format!!!\n");
909 err = -EINVAL;
910 goto failure;
911 }
912 }
913 err = _snd_pcm_hw_param_set(sparams, SNDRV_PCM_HW_PARAM_FORMAT, (__force int)sformat, 0);
914 if (err < 0)
915 goto failure;
916
917 if (direct) {
918 memcpy(params, sparams, sizeof(*params));
919 } else {
920 _snd_pcm_hw_params_any(params);
921 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
922 (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED, 0);
923 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
924 (__force int)snd_pcm_oss_format_from(runtime->oss.format), 0);
925 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
926 runtime->oss.channels, 0);
927 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
928 runtime->oss.rate, 0);
929 pdprintf("client: access = %i, format = %i, channels = %i, rate = %i\n",
930 params_access(params), params_format(params),
931 params_channels(params), params_rate(params));
932 }
933 pdprintf("slave: access = %i, format = %i, channels = %i, rate = %i\n",
934 params_access(sparams), params_format(sparams),
935 params_channels(sparams), params_rate(sparams));
936
937 oss_frame_size = snd_pcm_format_physical_width(params_format(params)) *
938 params_channels(params) / 8;
939
940 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
941 snd_pcm_oss_plugin_clear(substream);
942 if (!direct) {
943 /* add necessary plugins */
944 snd_pcm_oss_plugin_clear(substream);
945 if ((err = snd_pcm_plug_format_plugins(substream,
946 params,
947 sparams)) < 0) {
948 pcm_dbg(substream->pcm,
949 "snd_pcm_plug_format_plugins failed: %i\n", err);
950 snd_pcm_oss_plugin_clear(substream);
951 goto failure;
952 }
953 if (runtime->oss.plugin_first) {
954 struct snd_pcm_plugin *plugin;
955 if ((err = snd_pcm_plugin_build_io(substream, sparams, &plugin)) < 0) {
956 pcm_dbg(substream->pcm,
957 "snd_pcm_plugin_build_io failed: %i\n", err);
958 snd_pcm_oss_plugin_clear(substream);
959 goto failure;
960 }
961 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
962 err = snd_pcm_plugin_append(plugin);
963 } else {
964 err = snd_pcm_plugin_insert(plugin);
965 }
966 if (err < 0) {
967 snd_pcm_oss_plugin_clear(substream);
968 goto failure;
969 }
970 }
971 }
972 #endif
973
974 err = snd_pcm_oss_period_size(substream, params, sparams);
975 if (err < 0)
976 goto failure;
977
978 n = snd_pcm_plug_slave_size(substream, runtime->oss.period_bytes / oss_frame_size);
979 err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, n, NULL);
980 if (err < 0)
981 goto failure;
982
983 err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIODS,
984 runtime->oss.periods, NULL);
985 if (err < 0)
986 goto failure;
987
988 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
989
990 if ((err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, sparams)) < 0) {
991 pcm_dbg(substream->pcm, "HW_PARAMS failed: %i\n", err);
992 goto failure;
993 }
994
995 memset(sw_params, 0, sizeof(*sw_params));
996 if (runtime->oss.trigger) {
997 sw_params->start_threshold = 1;
998 } else {
999 sw_params->start_threshold = runtime->boundary;
1000 }
1001 if (atomic_read(&substream->mmap_count) ||
1002 substream->stream == SNDRV_PCM_STREAM_CAPTURE)
1003 sw_params->stop_threshold = runtime->boundary;
1004 else
1005 sw_params->stop_threshold = runtime->buffer_size;
1006 sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
1007 sw_params->period_step = 1;
1008 sw_params->avail_min = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
1009 1 : runtime->period_size;
1010 if (atomic_read(&substream->mmap_count) ||
1011 substream->oss.setup.nosilence) {
1012 sw_params->silence_threshold = 0;
1013 sw_params->silence_size = 0;
1014 } else {
1015 snd_pcm_uframes_t frames;
1016 frames = runtime->period_size + 16;
1017 if (frames > runtime->buffer_size)
1018 frames = runtime->buffer_size;
1019 sw_params->silence_threshold = frames;
1020 sw_params->silence_size = frames;
1021 }
1022
1023 if ((err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_SW_PARAMS, sw_params)) < 0) {
1024 pcm_dbg(substream->pcm, "SW_PARAMS failed: %i\n", err);
1025 goto failure;
1026 }
1027
1028 runtime->oss.periods = params_periods(sparams);
1029 oss_period_size = snd_pcm_plug_client_size(substream, params_period_size(sparams));
1030 if (oss_period_size < 0) {
1031 err = -EINVAL;
1032 goto failure;
1033 }
1034 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1035 if (runtime->oss.plugin_first) {
1036 err = snd_pcm_plug_alloc(substream, oss_period_size);
1037 if (err < 0)
1038 goto failure;
1039 }
1040 #endif
1041 oss_period_size *= oss_frame_size;
1042
1043 oss_buffer_size = oss_period_size * runtime->oss.periods;
1044 if (oss_buffer_size < 0) {
1045 err = -EINVAL;
1046 goto failure;
1047 }
1048
1049 runtime->oss.period_bytes = oss_period_size;
1050 runtime->oss.buffer_bytes = oss_buffer_size;
1051
1052 pdprintf("oss: period bytes = %i, buffer bytes = %i\n",
1053 runtime->oss.period_bytes,
1054 runtime->oss.buffer_bytes);
1055 pdprintf("slave: period_size = %i, buffer_size = %i\n",
1056 params_period_size(sparams),
1057 params_buffer_size(sparams));
1058
1059 runtime->oss.format = snd_pcm_oss_format_to(params_format(params));
1060 runtime->oss.channels = params_channels(params);
1061 runtime->oss.rate = params_rate(params);
1062
1063 vfree(runtime->oss.buffer);
1064 runtime->oss.buffer = vmalloc(runtime->oss.period_bytes);
1065 if (!runtime->oss.buffer) {
1066 err = -ENOMEM;
1067 goto failure;
1068 }
1069
1070 runtime->oss.params = 0;
1071 runtime->oss.prepare = 1;
1072 runtime->oss.buffer_used = 0;
1073 if (runtime->dma_area)
1074 snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes));
1075
1076 runtime->oss.period_frames = snd_pcm_alsa_frames(substream, oss_period_size);
1077
1078 err = 0;
1079 failure:
1080 kfree(sw_params);
1081 kfree(params);
1082 kfree(sparams);
1083 mutex_unlock(&runtime->oss.params_lock);
1084 return err;
1085 }
1086
snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file * pcm_oss_file,struct snd_pcm_substream ** r_substream)1087 static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream)
1088 {
1089 int idx, err;
1090 struct snd_pcm_substream *asubstream = NULL, *substream;
1091
1092 for (idx = 0; idx < 2; idx++) {
1093 substream = pcm_oss_file->streams[idx];
1094 if (substream == NULL)
1095 continue;
1096 if (asubstream == NULL)
1097 asubstream = substream;
1098 if (substream->runtime->oss.params) {
1099 err = snd_pcm_oss_change_params(substream, false);
1100 if (err < 0)
1101 return err;
1102 }
1103 }
1104 if (!asubstream)
1105 return -EIO;
1106 if (r_substream)
1107 *r_substream = asubstream;
1108 return 0;
1109 }
1110
snd_pcm_oss_prepare(struct snd_pcm_substream * substream)1111 static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
1112 {
1113 int err;
1114 struct snd_pcm_runtime *runtime = substream->runtime;
1115
1116 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
1117 if (err < 0) {
1118 pcm_dbg(substream->pcm,
1119 "snd_pcm_oss_prepare: SNDRV_PCM_IOCTL_PREPARE failed\n");
1120 return err;
1121 }
1122 runtime->oss.prepare = 0;
1123 runtime->oss.prev_hw_ptr_period = 0;
1124 runtime->oss.period_ptr = 0;
1125 runtime->oss.buffer_used = 0;
1126
1127 return 0;
1128 }
1129
snd_pcm_oss_make_ready(struct snd_pcm_substream * substream)1130 static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream)
1131 {
1132 struct snd_pcm_runtime *runtime;
1133 int err;
1134
1135 if (substream == NULL)
1136 return 0;
1137 runtime = substream->runtime;
1138 if (runtime->oss.params) {
1139 err = snd_pcm_oss_change_params(substream, false);
1140 if (err < 0)
1141 return err;
1142 }
1143 if (runtime->oss.prepare) {
1144 err = snd_pcm_oss_prepare(substream);
1145 if (err < 0)
1146 return err;
1147 }
1148 return 0;
1149 }
1150
snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream * substream,snd_pcm_sframes_t * delay)1151 static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay)
1152 {
1153 struct snd_pcm_runtime *runtime;
1154 snd_pcm_uframes_t frames;
1155 int err = 0;
1156
1157 while (1) {
1158 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, delay);
1159 if (err < 0)
1160 break;
1161 runtime = substream->runtime;
1162 if (*delay <= (snd_pcm_sframes_t)runtime->buffer_size)
1163 break;
1164 /* in case of overrun, skip whole periods like OSS/Linux driver does */
1165 /* until avail(delay) <= buffer_size */
1166 frames = (*delay - runtime->buffer_size) + runtime->period_size - 1;
1167 frames /= runtime->period_size;
1168 frames *= runtime->period_size;
1169 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_FORWARD, &frames);
1170 if (err < 0)
1171 break;
1172 }
1173 return err;
1174 }
1175
snd_pcm_oss_write3(struct snd_pcm_substream * substream,const char * ptr,snd_pcm_uframes_t frames,int in_kernel)1176 snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1177 {
1178 struct snd_pcm_runtime *runtime = substream->runtime;
1179 int ret;
1180 while (1) {
1181 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1182 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1183 #ifdef OSS_DEBUG
1184 pcm_dbg(substream->pcm,
1185 "pcm_oss: write: recovering from %s\n",
1186 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1187 "XRUN" : "SUSPEND");
1188 #endif
1189 ret = snd_pcm_oss_prepare(substream);
1190 if (ret < 0)
1191 break;
1192 }
1193 if (in_kernel) {
1194 mm_segment_t fs;
1195 fs = snd_enter_user();
1196 ret = snd_pcm_lib_write(substream, (void __force __user *)ptr, frames);
1197 snd_leave_user(fs);
1198 } else {
1199 ret = snd_pcm_lib_write(substream, (void __force __user *)ptr, frames);
1200 }
1201 if (ret != -EPIPE && ret != -ESTRPIPE)
1202 break;
1203 /* test, if we can't store new data, because the stream */
1204 /* has not been started */
1205 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1206 return -EAGAIN;
1207 }
1208 return ret;
1209 }
1210
snd_pcm_oss_read3(struct snd_pcm_substream * substream,char * ptr,snd_pcm_uframes_t frames,int in_kernel)1211 snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1212 {
1213 struct snd_pcm_runtime *runtime = substream->runtime;
1214 snd_pcm_sframes_t delay;
1215 int ret;
1216 while (1) {
1217 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1218 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1219 #ifdef OSS_DEBUG
1220 pcm_dbg(substream->pcm,
1221 "pcm_oss: read: recovering from %s\n",
1222 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1223 "XRUN" : "SUSPEND");
1224 #endif
1225 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1226 if (ret < 0)
1227 break;
1228 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1229 ret = snd_pcm_oss_prepare(substream);
1230 if (ret < 0)
1231 break;
1232 }
1233 ret = snd_pcm_oss_capture_position_fixup(substream, &delay);
1234 if (ret < 0)
1235 break;
1236 if (in_kernel) {
1237 mm_segment_t fs;
1238 fs = snd_enter_user();
1239 ret = snd_pcm_lib_read(substream, (void __force __user *)ptr, frames);
1240 snd_leave_user(fs);
1241 } else {
1242 ret = snd_pcm_lib_read(substream, (void __force __user *)ptr, frames);
1243 }
1244 if (ret == -EPIPE) {
1245 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1246 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1247 if (ret < 0)
1248 break;
1249 }
1250 continue;
1251 }
1252 if (ret != -ESTRPIPE)
1253 break;
1254 }
1255 return ret;
1256 }
1257
snd_pcm_oss_writev3(struct snd_pcm_substream * substream,void ** bufs,snd_pcm_uframes_t frames,int in_kernel)1258 snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames, int in_kernel)
1259 {
1260 struct snd_pcm_runtime *runtime = substream->runtime;
1261 int ret;
1262 while (1) {
1263 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1264 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1265 #ifdef OSS_DEBUG
1266 pcm_dbg(substream->pcm,
1267 "pcm_oss: writev: recovering from %s\n",
1268 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1269 "XRUN" : "SUSPEND");
1270 #endif
1271 ret = snd_pcm_oss_prepare(substream);
1272 if (ret < 0)
1273 break;
1274 }
1275 if (in_kernel) {
1276 mm_segment_t fs;
1277 fs = snd_enter_user();
1278 ret = snd_pcm_lib_writev(substream, (void __user **)bufs, frames);
1279 snd_leave_user(fs);
1280 } else {
1281 ret = snd_pcm_lib_writev(substream, (void __user **)bufs, frames);
1282 }
1283 if (ret != -EPIPE && ret != -ESTRPIPE)
1284 break;
1285
1286 /* test, if we can't store new data, because the stream */
1287 /* has not been started */
1288 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1289 return -EAGAIN;
1290 }
1291 return ret;
1292 }
1293
snd_pcm_oss_readv3(struct snd_pcm_substream * substream,void ** bufs,snd_pcm_uframes_t frames,int in_kernel)1294 snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames, int in_kernel)
1295 {
1296 struct snd_pcm_runtime *runtime = substream->runtime;
1297 int ret;
1298 while (1) {
1299 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1300 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1301 #ifdef OSS_DEBUG
1302 pcm_dbg(substream->pcm,
1303 "pcm_oss: readv: recovering from %s\n",
1304 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1305 "XRUN" : "SUSPEND");
1306 #endif
1307 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1308 if (ret < 0)
1309 break;
1310 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1311 ret = snd_pcm_oss_prepare(substream);
1312 if (ret < 0)
1313 break;
1314 }
1315 if (in_kernel) {
1316 mm_segment_t fs;
1317 fs = snd_enter_user();
1318 ret = snd_pcm_lib_readv(substream, (void __user **)bufs, frames);
1319 snd_leave_user(fs);
1320 } else {
1321 ret = snd_pcm_lib_readv(substream, (void __user **)bufs, frames);
1322 }
1323 if (ret != -EPIPE && ret != -ESTRPIPE)
1324 break;
1325 }
1326 return ret;
1327 }
1328
snd_pcm_oss_write2(struct snd_pcm_substream * substream,const char * buf,size_t bytes,int in_kernel)1329 static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel)
1330 {
1331 struct snd_pcm_runtime *runtime = substream->runtime;
1332 snd_pcm_sframes_t frames, frames1;
1333 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1334 if (runtime->oss.plugin_first) {
1335 struct snd_pcm_plugin_channel *channels;
1336 size_t oss_frame_bytes = (runtime->oss.plugin_first->src_width * runtime->oss.plugin_first->src_format.channels) / 8;
1337 if (!in_kernel) {
1338 if (copy_from_user(runtime->oss.buffer, (const char __force __user *)buf, bytes))
1339 return -EFAULT;
1340 buf = runtime->oss.buffer;
1341 }
1342 frames = bytes / oss_frame_bytes;
1343 frames1 = snd_pcm_plug_client_channels_buf(substream, (char *)buf, frames, &channels);
1344 if (frames1 < 0)
1345 return frames1;
1346 frames1 = snd_pcm_plug_write_transfer(substream, channels, frames1);
1347 if (frames1 <= 0)
1348 return frames1;
1349 bytes = frames1 * oss_frame_bytes;
1350 } else
1351 #endif
1352 {
1353 frames = bytes_to_frames(runtime, bytes);
1354 frames1 = snd_pcm_oss_write3(substream, buf, frames, in_kernel);
1355 if (frames1 <= 0)
1356 return frames1;
1357 bytes = frames_to_bytes(runtime, frames1);
1358 }
1359 return bytes;
1360 }
1361
snd_pcm_oss_write1(struct snd_pcm_substream * substream,const char __user * buf,size_t bytes)1362 static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes)
1363 {
1364 size_t xfer = 0;
1365 ssize_t tmp;
1366 struct snd_pcm_runtime *runtime = substream->runtime;
1367
1368 if (atomic_read(&substream->mmap_count))
1369 return -ENXIO;
1370
1371 if ((tmp = snd_pcm_oss_make_ready(substream)) < 0)
1372 return tmp;
1373 mutex_lock(&runtime->oss.params_lock);
1374 while (bytes > 0) {
1375 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1376 tmp = bytes;
1377 if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
1378 tmp = runtime->oss.period_bytes - runtime->oss.buffer_used;
1379 if (tmp > 0) {
1380 if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp)) {
1381 tmp = -EFAULT;
1382 goto err;
1383 }
1384 }
1385 runtime->oss.buffer_used += tmp;
1386 buf += tmp;
1387 bytes -= tmp;
1388 xfer += tmp;
1389 if (substream->oss.setup.partialfrag ||
1390 runtime->oss.buffer_used == runtime->oss.period_bytes) {
1391 tmp = snd_pcm_oss_write2(substream, runtime->oss.buffer + runtime->oss.period_ptr,
1392 runtime->oss.buffer_used - runtime->oss.period_ptr, 1);
1393 if (tmp <= 0)
1394 goto err;
1395 runtime->oss.bytes += tmp;
1396 runtime->oss.period_ptr += tmp;
1397 runtime->oss.period_ptr %= runtime->oss.period_bytes;
1398 if (runtime->oss.period_ptr == 0 ||
1399 runtime->oss.period_ptr == runtime->oss.buffer_used)
1400 runtime->oss.buffer_used = 0;
1401 else if ((substream->f_flags & O_NONBLOCK) != 0) {
1402 tmp = -EAGAIN;
1403 goto err;
1404 }
1405 }
1406 } else {
1407 tmp = snd_pcm_oss_write2(substream,
1408 (const char __force *)buf,
1409 runtime->oss.period_bytes, 0);
1410 if (tmp <= 0)
1411 goto err;
1412 runtime->oss.bytes += tmp;
1413 buf += tmp;
1414 bytes -= tmp;
1415 xfer += tmp;
1416 if ((substream->f_flags & O_NONBLOCK) != 0 &&
1417 tmp != runtime->oss.period_bytes)
1418 break;
1419 }
1420 }
1421 mutex_unlock(&runtime->oss.params_lock);
1422 return xfer;
1423
1424 err:
1425 mutex_unlock(&runtime->oss.params_lock);
1426 return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1427 }
1428
snd_pcm_oss_read2(struct snd_pcm_substream * substream,char * buf,size_t bytes,int in_kernel)1429 static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel)
1430 {
1431 struct snd_pcm_runtime *runtime = substream->runtime;
1432 snd_pcm_sframes_t frames, frames1;
1433 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1434 char __user *final_dst = (char __force __user *)buf;
1435 if (runtime->oss.plugin_first) {
1436 struct snd_pcm_plugin_channel *channels;
1437 size_t oss_frame_bytes = (runtime->oss.plugin_last->dst_width * runtime->oss.plugin_last->dst_format.channels) / 8;
1438 if (!in_kernel)
1439 buf = runtime->oss.buffer;
1440 frames = bytes / oss_frame_bytes;
1441 frames1 = snd_pcm_plug_client_channels_buf(substream, buf, frames, &channels);
1442 if (frames1 < 0)
1443 return frames1;
1444 frames1 = snd_pcm_plug_read_transfer(substream, channels, frames1);
1445 if (frames1 <= 0)
1446 return frames1;
1447 bytes = frames1 * oss_frame_bytes;
1448 if (!in_kernel && copy_to_user(final_dst, buf, bytes))
1449 return -EFAULT;
1450 } else
1451 #endif
1452 {
1453 frames = bytes_to_frames(runtime, bytes);
1454 frames1 = snd_pcm_oss_read3(substream, buf, frames, in_kernel);
1455 if (frames1 <= 0)
1456 return frames1;
1457 bytes = frames_to_bytes(runtime, frames1);
1458 }
1459 return bytes;
1460 }
1461
snd_pcm_oss_read1(struct snd_pcm_substream * substream,char __user * buf,size_t bytes)1462 static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes)
1463 {
1464 size_t xfer = 0;
1465 ssize_t tmp;
1466 struct snd_pcm_runtime *runtime = substream->runtime;
1467
1468 if (atomic_read(&substream->mmap_count))
1469 return -ENXIO;
1470
1471 if ((tmp = snd_pcm_oss_make_ready(substream)) < 0)
1472 return tmp;
1473 mutex_lock(&runtime->oss.params_lock);
1474 while (bytes > 0) {
1475 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1476 if (runtime->oss.buffer_used == 0) {
1477 tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1);
1478 if (tmp <= 0)
1479 goto err;
1480 runtime->oss.bytes += tmp;
1481 runtime->oss.period_ptr = tmp;
1482 runtime->oss.buffer_used = tmp;
1483 }
1484 tmp = bytes;
1485 if ((size_t) tmp > runtime->oss.buffer_used)
1486 tmp = runtime->oss.buffer_used;
1487 if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp)) {
1488 tmp = -EFAULT;
1489 goto err;
1490 }
1491 buf += tmp;
1492 bytes -= tmp;
1493 xfer += tmp;
1494 runtime->oss.buffer_used -= tmp;
1495 } else {
1496 tmp = snd_pcm_oss_read2(substream, (char __force *)buf,
1497 runtime->oss.period_bytes, 0);
1498 if (tmp <= 0)
1499 goto err;
1500 runtime->oss.bytes += tmp;
1501 buf += tmp;
1502 bytes -= tmp;
1503 xfer += tmp;
1504 }
1505 }
1506 mutex_unlock(&runtime->oss.params_lock);
1507 return xfer;
1508
1509 err:
1510 mutex_unlock(&runtime->oss.params_lock);
1511 return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1512 }
1513
snd_pcm_oss_reset(struct snd_pcm_oss_file * pcm_oss_file)1514 static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
1515 {
1516 struct snd_pcm_substream *substream;
1517 struct snd_pcm_runtime *runtime;
1518 int i;
1519
1520 for (i = 0; i < 2; i++) {
1521 substream = pcm_oss_file->streams[i];
1522 if (!substream)
1523 continue;
1524 runtime = substream->runtime;
1525 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1526 runtime->oss.prepare = 1;
1527 runtime->oss.buffer_used = 0;
1528 runtime->oss.prev_hw_ptr_period = 0;
1529 runtime->oss.period_ptr = 0;
1530 }
1531 return 0;
1532 }
1533
snd_pcm_oss_post(struct snd_pcm_oss_file * pcm_oss_file)1534 static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file)
1535 {
1536 struct snd_pcm_substream *substream;
1537 int err;
1538
1539 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1540 if (substream != NULL) {
1541 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1542 return err;
1543 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL);
1544 }
1545 /* note: all errors from the start action are ignored */
1546 /* OSS apps do not know, how to handle them */
1547 return 0;
1548 }
1549
snd_pcm_oss_sync1(struct snd_pcm_substream * substream,size_t size)1550 static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size)
1551 {
1552 struct snd_pcm_runtime *runtime;
1553 ssize_t result = 0;
1554 snd_pcm_state_t state;
1555 long res;
1556 wait_queue_t wait;
1557
1558 runtime = substream->runtime;
1559 init_waitqueue_entry(&wait, current);
1560 add_wait_queue(&runtime->sleep, &wait);
1561 #ifdef OSS_DEBUG
1562 pcm_dbg(substream->pcm, "sync1: size = %li\n", size);
1563 #endif
1564 while (1) {
1565 result = snd_pcm_oss_write2(substream, runtime->oss.buffer, size, 1);
1566 if (result > 0) {
1567 runtime->oss.buffer_used = 0;
1568 result = 0;
1569 break;
1570 }
1571 if (result != 0 && result != -EAGAIN)
1572 break;
1573 result = 0;
1574 set_current_state(TASK_INTERRUPTIBLE);
1575 snd_pcm_stream_lock_irq(substream);
1576 state = runtime->status->state;
1577 snd_pcm_stream_unlock_irq(substream);
1578 if (state != SNDRV_PCM_STATE_RUNNING) {
1579 set_current_state(TASK_RUNNING);
1580 break;
1581 }
1582 res = schedule_timeout(10 * HZ);
1583 if (signal_pending(current)) {
1584 result = -ERESTARTSYS;
1585 break;
1586 }
1587 if (res == 0) {
1588 pcm_err(substream->pcm,
1589 "OSS sync error - DMA timeout\n");
1590 result = -EIO;
1591 break;
1592 }
1593 }
1594 remove_wait_queue(&runtime->sleep, &wait);
1595 return result;
1596 }
1597
snd_pcm_oss_sync(struct snd_pcm_oss_file * pcm_oss_file)1598 static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
1599 {
1600 int err = 0;
1601 unsigned int saved_f_flags;
1602 struct snd_pcm_substream *substream;
1603 struct snd_pcm_runtime *runtime;
1604 snd_pcm_format_t format;
1605 unsigned long width;
1606 size_t size;
1607
1608 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1609 if (substream != NULL) {
1610 runtime = substream->runtime;
1611 if (atomic_read(&substream->mmap_count))
1612 goto __direct;
1613 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1614 return err;
1615 format = snd_pcm_oss_format_from(runtime->oss.format);
1616 width = snd_pcm_format_physical_width(format);
1617 mutex_lock(&runtime->oss.params_lock);
1618 if (runtime->oss.buffer_used > 0) {
1619 #ifdef OSS_DEBUG
1620 pcm_dbg(substream->pcm, "sync: buffer_used\n");
1621 #endif
1622 size = (8 * (runtime->oss.period_bytes - runtime->oss.buffer_used) + 7) / width;
1623 snd_pcm_format_set_silence(format,
1624 runtime->oss.buffer + runtime->oss.buffer_used,
1625 size);
1626 err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes);
1627 if (err < 0) {
1628 mutex_unlock(&runtime->oss.params_lock);
1629 return err;
1630 }
1631 } else if (runtime->oss.period_ptr > 0) {
1632 #ifdef OSS_DEBUG
1633 pcm_dbg(substream->pcm, "sync: period_ptr\n");
1634 #endif
1635 size = runtime->oss.period_bytes - runtime->oss.period_ptr;
1636 snd_pcm_format_set_silence(format,
1637 runtime->oss.buffer,
1638 size * 8 / width);
1639 err = snd_pcm_oss_sync1(substream, size);
1640 if (err < 0) {
1641 mutex_unlock(&runtime->oss.params_lock);
1642 return err;
1643 }
1644 }
1645 /*
1646 * The ALSA's period might be a bit large than OSS one.
1647 * Fill the remain portion of ALSA period with zeros.
1648 */
1649 size = runtime->control->appl_ptr % runtime->period_size;
1650 if (size > 0) {
1651 size = runtime->period_size - size;
1652 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
1653 size = (runtime->frame_bits * size) / 8;
1654 while (size > 0) {
1655 mm_segment_t fs;
1656 size_t size1 = size < runtime->oss.period_bytes ? size : runtime->oss.period_bytes;
1657 size -= size1;
1658 size1 *= 8;
1659 size1 /= runtime->sample_bits;
1660 snd_pcm_format_set_silence(runtime->format,
1661 runtime->oss.buffer,
1662 size1);
1663 size1 /= runtime->channels; /* frames */
1664 fs = snd_enter_user();
1665 snd_pcm_lib_write(substream, (void __force __user *)runtime->oss.buffer, size1);
1666 snd_leave_user(fs);
1667 }
1668 } else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) {
1669 void __user *buffers[runtime->channels];
1670 memset(buffers, 0, runtime->channels * sizeof(void *));
1671 snd_pcm_lib_writev(substream, buffers, size);
1672 }
1673 }
1674 mutex_unlock(&runtime->oss.params_lock);
1675 /*
1676 * finish sync: drain the buffer
1677 */
1678 __direct:
1679 saved_f_flags = substream->f_flags;
1680 substream->f_flags &= ~O_NONBLOCK;
1681 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1682 substream->f_flags = saved_f_flags;
1683 if (err < 0)
1684 return err;
1685 runtime->oss.prepare = 1;
1686 }
1687
1688 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
1689 if (substream != NULL) {
1690 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1691 return err;
1692 runtime = substream->runtime;
1693 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1694 if (err < 0)
1695 return err;
1696 runtime->oss.buffer_used = 0;
1697 runtime->oss.prepare = 1;
1698 }
1699 return 0;
1700 }
1701
snd_pcm_oss_set_rate(struct snd_pcm_oss_file * pcm_oss_file,int rate)1702 static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)
1703 {
1704 int idx;
1705
1706 for (idx = 1; idx >= 0; --idx) {
1707 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1708 struct snd_pcm_runtime *runtime;
1709 if (substream == NULL)
1710 continue;
1711 runtime = substream->runtime;
1712 if (rate < 1000)
1713 rate = 1000;
1714 else if (rate > 192000)
1715 rate = 192000;
1716 if (runtime->oss.rate != rate) {
1717 runtime->oss.params = 1;
1718 runtime->oss.rate = rate;
1719 }
1720 }
1721 return snd_pcm_oss_get_rate(pcm_oss_file);
1722 }
1723
snd_pcm_oss_get_rate(struct snd_pcm_oss_file * pcm_oss_file)1724 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file)
1725 {
1726 struct snd_pcm_substream *substream;
1727 int err;
1728
1729 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1730 return err;
1731 return substream->runtime->oss.rate;
1732 }
1733
snd_pcm_oss_set_channels(struct snd_pcm_oss_file * pcm_oss_file,unsigned int channels)1734 static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels)
1735 {
1736 int idx;
1737 if (channels < 1)
1738 channels = 1;
1739 if (channels > 128)
1740 return -EINVAL;
1741 for (idx = 1; idx >= 0; --idx) {
1742 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1743 struct snd_pcm_runtime *runtime;
1744 if (substream == NULL)
1745 continue;
1746 runtime = substream->runtime;
1747 if (runtime->oss.channels != channels) {
1748 runtime->oss.params = 1;
1749 runtime->oss.channels = channels;
1750 }
1751 }
1752 return snd_pcm_oss_get_channels(pcm_oss_file);
1753 }
1754
snd_pcm_oss_get_channels(struct snd_pcm_oss_file * pcm_oss_file)1755 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file)
1756 {
1757 struct snd_pcm_substream *substream;
1758 int err;
1759
1760 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1761 return err;
1762 return substream->runtime->oss.channels;
1763 }
1764
snd_pcm_oss_get_block_size(struct snd_pcm_oss_file * pcm_oss_file)1765 static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file)
1766 {
1767 struct snd_pcm_substream *substream;
1768 int err;
1769
1770 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1771 return err;
1772 return substream->runtime->oss.period_bytes;
1773 }
1774
snd_pcm_oss_get_formats(struct snd_pcm_oss_file * pcm_oss_file)1775 static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file)
1776 {
1777 struct snd_pcm_substream *substream;
1778 int err;
1779 int direct;
1780 struct snd_pcm_hw_params *params;
1781 unsigned int formats = 0;
1782 struct snd_mask format_mask;
1783 int fmt;
1784
1785 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1786 return err;
1787 if (atomic_read(&substream->mmap_count))
1788 direct = 1;
1789 else
1790 direct = substream->oss.setup.direct;
1791 if (!direct)
1792 return AFMT_MU_LAW | AFMT_U8 |
1793 AFMT_S16_LE | AFMT_S16_BE |
1794 AFMT_S8 | AFMT_U16_LE |
1795 AFMT_U16_BE |
1796 AFMT_S32_LE | AFMT_S32_BE |
1797 AFMT_S24_LE | AFMT_S24_BE |
1798 AFMT_S24_PACKED;
1799 params = kmalloc(sizeof(*params), GFP_KERNEL);
1800 if (!params)
1801 return -ENOMEM;
1802 _snd_pcm_hw_params_any(params);
1803 err = snd_pcm_hw_refine(substream, params);
1804 format_mask = *hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1805 kfree(params);
1806 if (err < 0)
1807 return err;
1808 for (fmt = 0; fmt < 32; ++fmt) {
1809 if (snd_mask_test(&format_mask, fmt)) {
1810 int f = snd_pcm_oss_format_to(fmt);
1811 if (f >= 0)
1812 formats |= f;
1813 }
1814 }
1815 return formats;
1816 }
1817
snd_pcm_oss_set_format(struct snd_pcm_oss_file * pcm_oss_file,int format)1818 static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format)
1819 {
1820 int formats, idx;
1821
1822 if (format != AFMT_QUERY) {
1823 formats = snd_pcm_oss_get_formats(pcm_oss_file);
1824 if (formats < 0)
1825 return formats;
1826 if (!(formats & format))
1827 format = AFMT_U8;
1828 for (idx = 1; idx >= 0; --idx) {
1829 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1830 struct snd_pcm_runtime *runtime;
1831 if (substream == NULL)
1832 continue;
1833 runtime = substream->runtime;
1834 if (runtime->oss.format != format) {
1835 runtime->oss.params = 1;
1836 runtime->oss.format = format;
1837 }
1838 }
1839 }
1840 return snd_pcm_oss_get_format(pcm_oss_file);
1841 }
1842
snd_pcm_oss_get_format(struct snd_pcm_oss_file * pcm_oss_file)1843 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file)
1844 {
1845 struct snd_pcm_substream *substream;
1846 int err;
1847
1848 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1849 return err;
1850 return substream->runtime->oss.format;
1851 }
1852
snd_pcm_oss_set_subdivide1(struct snd_pcm_substream * substream,int subdivide)1853 static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide)
1854 {
1855 struct snd_pcm_runtime *runtime;
1856
1857 if (substream == NULL)
1858 return 0;
1859 runtime = substream->runtime;
1860 if (subdivide == 0) {
1861 subdivide = runtime->oss.subdivision;
1862 if (subdivide == 0)
1863 subdivide = 1;
1864 return subdivide;
1865 }
1866 if (runtime->oss.subdivision || runtime->oss.fragshift)
1867 return -EINVAL;
1868 if (subdivide != 1 && subdivide != 2 && subdivide != 4 &&
1869 subdivide != 8 && subdivide != 16)
1870 return -EINVAL;
1871 runtime->oss.subdivision = subdivide;
1872 runtime->oss.params = 1;
1873 return subdivide;
1874 }
1875
snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file * pcm_oss_file,int subdivide)1876 static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide)
1877 {
1878 int err = -EINVAL, idx;
1879
1880 for (idx = 1; idx >= 0; --idx) {
1881 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1882 if (substream == NULL)
1883 continue;
1884 if ((err = snd_pcm_oss_set_subdivide1(substream, subdivide)) < 0)
1885 return err;
1886 }
1887 return err;
1888 }
1889
snd_pcm_oss_set_fragment1(struct snd_pcm_substream * substream,unsigned int val)1890 static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val)
1891 {
1892 struct snd_pcm_runtime *runtime;
1893
1894 if (substream == NULL)
1895 return 0;
1896 runtime = substream->runtime;
1897 if (runtime->oss.subdivision || runtime->oss.fragshift)
1898 return -EINVAL;
1899 runtime->oss.fragshift = val & 0xffff;
1900 runtime->oss.maxfrags = (val >> 16) & 0xffff;
1901 if (runtime->oss.fragshift < 4) /* < 16 */
1902 runtime->oss.fragshift = 4;
1903 if (runtime->oss.maxfrags < 2)
1904 runtime->oss.maxfrags = 2;
1905 runtime->oss.params = 1;
1906 return 0;
1907 }
1908
snd_pcm_oss_set_fragment(struct snd_pcm_oss_file * pcm_oss_file,unsigned int val)1909 static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val)
1910 {
1911 int err = -EINVAL, idx;
1912
1913 for (idx = 1; idx >= 0; --idx) {
1914 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1915 if (substream == NULL)
1916 continue;
1917 if ((err = snd_pcm_oss_set_fragment1(substream, val)) < 0)
1918 return err;
1919 }
1920 return err;
1921 }
1922
snd_pcm_oss_nonblock(struct file * file)1923 static int snd_pcm_oss_nonblock(struct file * file)
1924 {
1925 spin_lock(&file->f_lock);
1926 file->f_flags |= O_NONBLOCK;
1927 spin_unlock(&file->f_lock);
1928 return 0;
1929 }
1930
snd_pcm_oss_get_caps1(struct snd_pcm_substream * substream,int res)1931 static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res)
1932 {
1933
1934 if (substream == NULL) {
1935 res &= ~DSP_CAP_DUPLEX;
1936 return res;
1937 }
1938 #ifdef DSP_CAP_MULTI
1939 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1940 if (substream->pstr->substream_count > 1)
1941 res |= DSP_CAP_MULTI;
1942 #endif
1943 /* DSP_CAP_REALTIME is set all times: */
1944 /* all ALSA drivers can return actual pointer in ring buffer */
1945 #if defined(DSP_CAP_REALTIME) && 0
1946 {
1947 struct snd_pcm_runtime *runtime = substream->runtime;
1948 if (runtime->info & (SNDRV_PCM_INFO_BLOCK_TRANSFER|SNDRV_PCM_INFO_BATCH))
1949 res &= ~DSP_CAP_REALTIME;
1950 }
1951 #endif
1952 return res;
1953 }
1954
snd_pcm_oss_get_caps(struct snd_pcm_oss_file * pcm_oss_file)1955 static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)
1956 {
1957 int result, idx;
1958
1959 result = DSP_CAP_TRIGGER | DSP_CAP_MMAP | DSP_CAP_DUPLEX | DSP_CAP_REALTIME;
1960 for (idx = 0; idx < 2; idx++) {
1961 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1962 result = snd_pcm_oss_get_caps1(substream, result);
1963 }
1964 result |= 0x0001; /* revision - same as SB AWE 64 */
1965 return result;
1966 }
1967
snd_pcm_oss_simulate_fill(struct snd_pcm_substream * substream,snd_pcm_uframes_t hw_ptr)1968 static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
1969 snd_pcm_uframes_t hw_ptr)
1970 {
1971 struct snd_pcm_runtime *runtime = substream->runtime;
1972 snd_pcm_uframes_t appl_ptr;
1973 appl_ptr = hw_ptr + runtime->buffer_size;
1974 appl_ptr %= runtime->boundary;
1975 runtime->control->appl_ptr = appl_ptr;
1976 }
1977
snd_pcm_oss_set_trigger(struct snd_pcm_oss_file * pcm_oss_file,int trigger)1978 static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger)
1979 {
1980 struct snd_pcm_runtime *runtime;
1981 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
1982 int err, cmd;
1983
1984 #ifdef OSS_DEBUG
1985 pcm_dbg(substream->pcm, "pcm_oss: trigger = 0x%x\n", trigger);
1986 #endif
1987
1988 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1989 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
1990
1991 if (psubstream) {
1992 if ((err = snd_pcm_oss_make_ready(psubstream)) < 0)
1993 return err;
1994 }
1995 if (csubstream) {
1996 if ((err = snd_pcm_oss_make_ready(csubstream)) < 0)
1997 return err;
1998 }
1999 if (psubstream) {
2000 runtime = psubstream->runtime;
2001 if (trigger & PCM_ENABLE_OUTPUT) {
2002 if (runtime->oss.trigger)
2003 goto _skip1;
2004 if (atomic_read(&psubstream->mmap_count))
2005 snd_pcm_oss_simulate_fill(psubstream,
2006 get_hw_ptr_period(runtime));
2007 runtime->oss.trigger = 1;
2008 runtime->start_threshold = 1;
2009 cmd = SNDRV_PCM_IOCTL_START;
2010 } else {
2011 if (!runtime->oss.trigger)
2012 goto _skip1;
2013 runtime->oss.trigger = 0;
2014 runtime->start_threshold = runtime->boundary;
2015 cmd = SNDRV_PCM_IOCTL_DROP;
2016 runtime->oss.prepare = 1;
2017 }
2018 err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL);
2019 if (err < 0)
2020 return err;
2021 }
2022 _skip1:
2023 if (csubstream) {
2024 runtime = csubstream->runtime;
2025 if (trigger & PCM_ENABLE_INPUT) {
2026 if (runtime->oss.trigger)
2027 goto _skip2;
2028 runtime->oss.trigger = 1;
2029 runtime->start_threshold = 1;
2030 cmd = SNDRV_PCM_IOCTL_START;
2031 } else {
2032 if (!runtime->oss.trigger)
2033 goto _skip2;
2034 runtime->oss.trigger = 0;
2035 runtime->start_threshold = runtime->boundary;
2036 cmd = SNDRV_PCM_IOCTL_DROP;
2037 runtime->oss.prepare = 1;
2038 }
2039 err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL);
2040 if (err < 0)
2041 return err;
2042 }
2043 _skip2:
2044 return 0;
2045 }
2046
snd_pcm_oss_get_trigger(struct snd_pcm_oss_file * pcm_oss_file)2047 static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file)
2048 {
2049 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2050 int result = 0;
2051
2052 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2053 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2054 if (psubstream && psubstream->runtime && psubstream->runtime->oss.trigger)
2055 result |= PCM_ENABLE_OUTPUT;
2056 if (csubstream && csubstream->runtime && csubstream->runtime->oss.trigger)
2057 result |= PCM_ENABLE_INPUT;
2058 return result;
2059 }
2060
snd_pcm_oss_get_odelay(struct snd_pcm_oss_file * pcm_oss_file)2061 static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file)
2062 {
2063 struct snd_pcm_substream *substream;
2064 struct snd_pcm_runtime *runtime;
2065 snd_pcm_sframes_t delay;
2066 int err;
2067
2068 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2069 if (substream == NULL)
2070 return -EINVAL;
2071 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
2072 return err;
2073 runtime = substream->runtime;
2074 if (runtime->oss.params || runtime->oss.prepare)
2075 return 0;
2076 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2077 if (err == -EPIPE)
2078 delay = 0; /* hack for broken OSS applications */
2079 else if (err < 0)
2080 return err;
2081 return snd_pcm_oss_bytes(substream, delay);
2082 }
2083
snd_pcm_oss_get_ptr(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct count_info __user * _info)2084 static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info)
2085 {
2086 struct snd_pcm_substream *substream;
2087 struct snd_pcm_runtime *runtime;
2088 snd_pcm_sframes_t delay;
2089 int fixup;
2090 struct count_info info;
2091 int err;
2092
2093 if (_info == NULL)
2094 return -EFAULT;
2095 substream = pcm_oss_file->streams[stream];
2096 if (substream == NULL)
2097 return -EINVAL;
2098 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
2099 return err;
2100 runtime = substream->runtime;
2101 if (runtime->oss.params || runtime->oss.prepare) {
2102 memset(&info, 0, sizeof(info));
2103 if (copy_to_user(_info, &info, sizeof(info)))
2104 return -EFAULT;
2105 return 0;
2106 }
2107 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2108 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2109 if (err == -EPIPE || err == -ESTRPIPE || (! err && delay < 0)) {
2110 err = 0;
2111 delay = 0;
2112 fixup = 0;
2113 } else {
2114 fixup = runtime->oss.buffer_used;
2115 }
2116 } else {
2117 err = snd_pcm_oss_capture_position_fixup(substream, &delay);
2118 fixup = -runtime->oss.buffer_used;
2119 }
2120 if (err < 0)
2121 return err;
2122 info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size);
2123 if (atomic_read(&substream->mmap_count)) {
2124 snd_pcm_sframes_t n;
2125 delay = get_hw_ptr_period(runtime);
2126 n = delay - runtime->oss.prev_hw_ptr_period;
2127 if (n < 0)
2128 n += runtime->boundary;
2129 info.blocks = n / runtime->period_size;
2130 runtime->oss.prev_hw_ptr_period = delay;
2131 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2132 snd_pcm_oss_simulate_fill(substream, delay);
2133 info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
2134 } else {
2135 delay = snd_pcm_oss_bytes(substream, delay);
2136 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2137 if (substream->oss.setup.buggyptr)
2138 info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
2139 else
2140 info.blocks = (delay + fixup) / runtime->oss.period_bytes;
2141 info.bytes = (runtime->oss.bytes - delay) & INT_MAX;
2142 } else {
2143 delay += fixup;
2144 info.blocks = delay / runtime->oss.period_bytes;
2145 info.bytes = (runtime->oss.bytes + delay) & INT_MAX;
2146 }
2147 }
2148 if (copy_to_user(_info, &info, sizeof(info)))
2149 return -EFAULT;
2150 return 0;
2151 }
2152
snd_pcm_oss_get_space(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct audio_buf_info __user * _info)2153 static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info)
2154 {
2155 struct snd_pcm_substream *substream;
2156 struct snd_pcm_runtime *runtime;
2157 snd_pcm_sframes_t avail;
2158 int fixup;
2159 struct audio_buf_info info;
2160 int err;
2161
2162 if (_info == NULL)
2163 return -EFAULT;
2164 substream = pcm_oss_file->streams[stream];
2165 if (substream == NULL)
2166 return -EINVAL;
2167 runtime = substream->runtime;
2168
2169 if (runtime->oss.params &&
2170 (err = snd_pcm_oss_change_params(substream, false)) < 0)
2171 return err;
2172
2173 info.fragsize = runtime->oss.period_bytes;
2174 info.fragstotal = runtime->periods;
2175 if (runtime->oss.prepare) {
2176 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2177 info.bytes = runtime->oss.period_bytes * runtime->oss.periods;
2178 info.fragments = runtime->oss.periods;
2179 } else {
2180 info.bytes = 0;
2181 info.fragments = 0;
2182 }
2183 } else {
2184 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2185 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &avail);
2186 if (err == -EPIPE || err == -ESTRPIPE || (! err && avail < 0)) {
2187 avail = runtime->buffer_size;
2188 err = 0;
2189 fixup = 0;
2190 } else {
2191 avail = runtime->buffer_size - avail;
2192 fixup = -runtime->oss.buffer_used;
2193 }
2194 } else {
2195 err = snd_pcm_oss_capture_position_fixup(substream, &avail);
2196 fixup = runtime->oss.buffer_used;
2197 }
2198 if (err < 0)
2199 return err;
2200 info.bytes = snd_pcm_oss_bytes(substream, avail) + fixup;
2201 info.fragments = info.bytes / runtime->oss.period_bytes;
2202 }
2203
2204 #ifdef OSS_DEBUG
2205 pcm_dbg(substream->pcm,
2206 "pcm_oss: space: bytes = %i, fragments = %i, fragstotal = %i, fragsize = %i\n",
2207 info.bytes, info.fragments, info.fragstotal, info.fragsize);
2208 #endif
2209 if (copy_to_user(_info, &info, sizeof(info)))
2210 return -EFAULT;
2211 return 0;
2212 }
2213
snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct buffmem_desc __user * _info)2214 static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info)
2215 {
2216 // it won't be probably implemented
2217 // pr_debug("TODO: snd_pcm_oss_get_mapbuf\n");
2218 return -EINVAL;
2219 }
2220
strip_task_path(const char * path)2221 static const char *strip_task_path(const char *path)
2222 {
2223 const char *ptr, *ptrl = NULL;
2224 for (ptr = path; *ptr; ptr++) {
2225 if (*ptr == '/')
2226 ptrl = ptr + 1;
2227 }
2228 return ptrl;
2229 }
2230
snd_pcm_oss_look_for_setup(struct snd_pcm * pcm,int stream,const char * task_name,struct snd_pcm_oss_setup * rsetup)2231 static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
2232 const char *task_name,
2233 struct snd_pcm_oss_setup *rsetup)
2234 {
2235 struct snd_pcm_oss_setup *setup;
2236
2237 mutex_lock(&pcm->streams[stream].oss.setup_mutex);
2238 do {
2239 for (setup = pcm->streams[stream].oss.setup_list; setup;
2240 setup = setup->next) {
2241 if (!strcmp(setup->task_name, task_name))
2242 goto out;
2243 }
2244 } while ((task_name = strip_task_path(task_name)) != NULL);
2245 out:
2246 if (setup)
2247 *rsetup = *setup;
2248 mutex_unlock(&pcm->streams[stream].oss.setup_mutex);
2249 }
2250
snd_pcm_oss_release_substream(struct snd_pcm_substream * substream)2251 static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream)
2252 {
2253 struct snd_pcm_runtime *runtime;
2254 runtime = substream->runtime;
2255 vfree(runtime->oss.buffer);
2256 runtime->oss.buffer = NULL;
2257 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2258 snd_pcm_oss_plugin_clear(substream);
2259 #endif
2260 substream->oss.oss = 0;
2261 }
2262
snd_pcm_oss_init_substream(struct snd_pcm_substream * substream,struct snd_pcm_oss_setup * setup,int minor)2263 static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
2264 struct snd_pcm_oss_setup *setup,
2265 int minor)
2266 {
2267 struct snd_pcm_runtime *runtime;
2268
2269 substream->oss.oss = 1;
2270 substream->oss.setup = *setup;
2271 if (setup->nonblock)
2272 substream->f_flags |= O_NONBLOCK;
2273 else if (setup->block)
2274 substream->f_flags &= ~O_NONBLOCK;
2275 runtime = substream->runtime;
2276 runtime->oss.params = 1;
2277 runtime->oss.trigger = 1;
2278 runtime->oss.rate = 8000;
2279 mutex_init(&runtime->oss.params_lock);
2280 switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
2281 case SNDRV_MINOR_OSS_PCM_8:
2282 runtime->oss.format = AFMT_U8;
2283 break;
2284 case SNDRV_MINOR_OSS_PCM_16:
2285 runtime->oss.format = AFMT_S16_LE;
2286 break;
2287 default:
2288 runtime->oss.format = AFMT_MU_LAW;
2289 }
2290 runtime->oss.channels = 1;
2291 runtime->oss.fragshift = 0;
2292 runtime->oss.maxfrags = 0;
2293 runtime->oss.subdivision = 0;
2294 substream->pcm_release = snd_pcm_oss_release_substream;
2295 }
2296
snd_pcm_oss_release_file(struct snd_pcm_oss_file * pcm_oss_file)2297 static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file)
2298 {
2299 int cidx;
2300 if (!pcm_oss_file)
2301 return 0;
2302 for (cidx = 0; cidx < 2; ++cidx) {
2303 struct snd_pcm_substream *substream = pcm_oss_file->streams[cidx];
2304 if (substream)
2305 snd_pcm_release_substream(substream);
2306 }
2307 kfree(pcm_oss_file);
2308 return 0;
2309 }
2310
snd_pcm_oss_open_file(struct file * file,struct snd_pcm * pcm,struct snd_pcm_oss_file ** rpcm_oss_file,int minor,struct snd_pcm_oss_setup * setup)2311 static int snd_pcm_oss_open_file(struct file *file,
2312 struct snd_pcm *pcm,
2313 struct snd_pcm_oss_file **rpcm_oss_file,
2314 int minor,
2315 struct snd_pcm_oss_setup *setup)
2316 {
2317 int idx, err;
2318 struct snd_pcm_oss_file *pcm_oss_file;
2319 struct snd_pcm_substream *substream;
2320 fmode_t f_mode = file->f_mode;
2321
2322 if (rpcm_oss_file)
2323 *rpcm_oss_file = NULL;
2324
2325 pcm_oss_file = kzalloc(sizeof(*pcm_oss_file), GFP_KERNEL);
2326 if (pcm_oss_file == NULL)
2327 return -ENOMEM;
2328
2329 if ((f_mode & (FMODE_WRITE|FMODE_READ)) == (FMODE_WRITE|FMODE_READ) &&
2330 (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX))
2331 f_mode = FMODE_WRITE;
2332
2333 file->f_flags &= ~O_APPEND;
2334 for (idx = 0; idx < 2; idx++) {
2335 if (setup[idx].disable)
2336 continue;
2337 if (! pcm->streams[idx].substream_count)
2338 continue; /* no matching substream */
2339 if (idx == SNDRV_PCM_STREAM_PLAYBACK) {
2340 if (! (f_mode & FMODE_WRITE))
2341 continue;
2342 } else {
2343 if (! (f_mode & FMODE_READ))
2344 continue;
2345 }
2346 err = snd_pcm_open_substream(pcm, idx, file, &substream);
2347 if (err < 0) {
2348 snd_pcm_oss_release_file(pcm_oss_file);
2349 return err;
2350 }
2351
2352 pcm_oss_file->streams[idx] = substream;
2353 substream->file = pcm_oss_file;
2354 snd_pcm_oss_init_substream(substream, &setup[idx], minor);
2355 }
2356
2357 if (!pcm_oss_file->streams[0] && !pcm_oss_file->streams[1]) {
2358 snd_pcm_oss_release_file(pcm_oss_file);
2359 return -EINVAL;
2360 }
2361
2362 file->private_data = pcm_oss_file;
2363 if (rpcm_oss_file)
2364 *rpcm_oss_file = pcm_oss_file;
2365 return 0;
2366 }
2367
2368
snd_task_name(struct task_struct * task,char * name,size_t size)2369 static int snd_task_name(struct task_struct *task, char *name, size_t size)
2370 {
2371 unsigned int idx;
2372
2373 if (snd_BUG_ON(!task || !name || size < 2))
2374 return -EINVAL;
2375 for (idx = 0; idx < sizeof(task->comm) && idx + 1 < size; idx++)
2376 name[idx] = task->comm[idx];
2377 name[idx] = '\0';
2378 return 0;
2379 }
2380
snd_pcm_oss_open(struct inode * inode,struct file * file)2381 static int snd_pcm_oss_open(struct inode *inode, struct file *file)
2382 {
2383 int err;
2384 char task_name[32];
2385 struct snd_pcm *pcm;
2386 struct snd_pcm_oss_file *pcm_oss_file;
2387 struct snd_pcm_oss_setup setup[2];
2388 int nonblock;
2389 wait_queue_t wait;
2390
2391 err = nonseekable_open(inode, file);
2392 if (err < 0)
2393 return err;
2394
2395 pcm = snd_lookup_oss_minor_data(iminor(inode),
2396 SNDRV_OSS_DEVICE_TYPE_PCM);
2397 if (pcm == NULL) {
2398 err = -ENODEV;
2399 goto __error1;
2400 }
2401 err = snd_card_file_add(pcm->card, file);
2402 if (err < 0)
2403 goto __error1;
2404 if (!try_module_get(pcm->card->module)) {
2405 err = -EFAULT;
2406 goto __error2;
2407 }
2408 if (snd_task_name(current, task_name, sizeof(task_name)) < 0) {
2409 err = -EFAULT;
2410 goto __error;
2411 }
2412 memset(setup, 0, sizeof(setup));
2413 if (file->f_mode & FMODE_WRITE)
2414 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_PLAYBACK,
2415 task_name, &setup[0]);
2416 if (file->f_mode & FMODE_READ)
2417 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_CAPTURE,
2418 task_name, &setup[1]);
2419
2420 nonblock = !!(file->f_flags & O_NONBLOCK);
2421 if (!nonblock)
2422 nonblock = nonblock_open;
2423
2424 init_waitqueue_entry(&wait, current);
2425 add_wait_queue(&pcm->open_wait, &wait);
2426 mutex_lock(&pcm->open_mutex);
2427 while (1) {
2428 err = snd_pcm_oss_open_file(file, pcm, &pcm_oss_file,
2429 iminor(inode), setup);
2430 if (err >= 0)
2431 break;
2432 if (err == -EAGAIN) {
2433 if (nonblock) {
2434 err = -EBUSY;
2435 break;
2436 }
2437 } else
2438 break;
2439 set_current_state(TASK_INTERRUPTIBLE);
2440 mutex_unlock(&pcm->open_mutex);
2441 schedule();
2442 mutex_lock(&pcm->open_mutex);
2443 if (pcm->card->shutdown) {
2444 err = -ENODEV;
2445 break;
2446 }
2447 if (signal_pending(current)) {
2448 err = -ERESTARTSYS;
2449 break;
2450 }
2451 }
2452 remove_wait_queue(&pcm->open_wait, &wait);
2453 mutex_unlock(&pcm->open_mutex);
2454 if (err < 0)
2455 goto __error;
2456 snd_card_unref(pcm->card);
2457 return err;
2458
2459 __error:
2460 module_put(pcm->card->module);
2461 __error2:
2462 snd_card_file_remove(pcm->card, file);
2463 __error1:
2464 if (pcm)
2465 snd_card_unref(pcm->card);
2466 return err;
2467 }
2468
snd_pcm_oss_release(struct inode * inode,struct file * file)2469 static int snd_pcm_oss_release(struct inode *inode, struct file *file)
2470 {
2471 struct snd_pcm *pcm;
2472 struct snd_pcm_substream *substream;
2473 struct snd_pcm_oss_file *pcm_oss_file;
2474
2475 pcm_oss_file = file->private_data;
2476 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2477 if (substream == NULL)
2478 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2479 if (snd_BUG_ON(!substream))
2480 return -ENXIO;
2481 pcm = substream->pcm;
2482 if (!pcm->card->shutdown)
2483 snd_pcm_oss_sync(pcm_oss_file);
2484 mutex_lock(&pcm->open_mutex);
2485 snd_pcm_oss_release_file(pcm_oss_file);
2486 mutex_unlock(&pcm->open_mutex);
2487 wake_up(&pcm->open_wait);
2488 module_put(pcm->card->module);
2489 snd_card_file_remove(pcm->card, file);
2490 return 0;
2491 }
2492
snd_pcm_oss_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2493 static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2494 {
2495 struct snd_pcm_oss_file *pcm_oss_file;
2496 int __user *p = (int __user *)arg;
2497 int res;
2498
2499 pcm_oss_file = file->private_data;
2500 if (cmd == OSS_GETVERSION)
2501 return put_user(SNDRV_OSS_VERSION, p);
2502 if (cmd == OSS_ALSAEMULVER)
2503 return put_user(1, p);
2504 #if defined(CONFIG_SND_MIXER_OSS) || (defined(MODULE) && defined(CONFIG_SND_MIXER_OSS_MODULE))
2505 if (((cmd >> 8) & 0xff) == 'M') { /* mixer ioctl - for OSS compatibility */
2506 struct snd_pcm_substream *substream;
2507 int idx;
2508 for (idx = 0; idx < 2; ++idx) {
2509 substream = pcm_oss_file->streams[idx];
2510 if (substream != NULL)
2511 break;
2512 }
2513 if (snd_BUG_ON(idx >= 2))
2514 return -ENXIO;
2515 return snd_mixer_oss_ioctl_card(substream->pcm->card, cmd, arg);
2516 }
2517 #endif
2518 if (((cmd >> 8) & 0xff) != 'P')
2519 return -EINVAL;
2520 #ifdef OSS_DEBUG
2521 pr_debug("pcm_oss: ioctl = 0x%x\n", cmd);
2522 #endif
2523 switch (cmd) {
2524 case SNDCTL_DSP_RESET:
2525 return snd_pcm_oss_reset(pcm_oss_file);
2526 case SNDCTL_DSP_SYNC:
2527 return snd_pcm_oss_sync(pcm_oss_file);
2528 case SNDCTL_DSP_SPEED:
2529 if (get_user(res, p))
2530 return -EFAULT;
2531 if ((res = snd_pcm_oss_set_rate(pcm_oss_file, res))<0)
2532 return res;
2533 return put_user(res, p);
2534 case SOUND_PCM_READ_RATE:
2535 res = snd_pcm_oss_get_rate(pcm_oss_file);
2536 if (res < 0)
2537 return res;
2538 return put_user(res, p);
2539 case SNDCTL_DSP_STEREO:
2540 if (get_user(res, p))
2541 return -EFAULT;
2542 res = res > 0 ? 2 : 1;
2543 if ((res = snd_pcm_oss_set_channels(pcm_oss_file, res)) < 0)
2544 return res;
2545 return put_user(--res, p);
2546 case SNDCTL_DSP_GETBLKSIZE:
2547 res = snd_pcm_oss_get_block_size(pcm_oss_file);
2548 if (res < 0)
2549 return res;
2550 return put_user(res, p);
2551 case SNDCTL_DSP_SETFMT:
2552 if (get_user(res, p))
2553 return -EFAULT;
2554 res = snd_pcm_oss_set_format(pcm_oss_file, res);
2555 if (res < 0)
2556 return res;
2557 return put_user(res, p);
2558 case SOUND_PCM_READ_BITS:
2559 res = snd_pcm_oss_get_format(pcm_oss_file);
2560 if (res < 0)
2561 return res;
2562 return put_user(res, p);
2563 case SNDCTL_DSP_CHANNELS:
2564 if (get_user(res, p))
2565 return -EFAULT;
2566 res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2567 if (res < 0)
2568 return res;
2569 return put_user(res, p);
2570 case SOUND_PCM_READ_CHANNELS:
2571 res = snd_pcm_oss_get_channels(pcm_oss_file);
2572 if (res < 0)
2573 return res;
2574 return put_user(res, p);
2575 case SOUND_PCM_WRITE_FILTER:
2576 case SOUND_PCM_READ_FILTER:
2577 return -EIO;
2578 case SNDCTL_DSP_POST:
2579 return snd_pcm_oss_post(pcm_oss_file);
2580 case SNDCTL_DSP_SUBDIVIDE:
2581 if (get_user(res, p))
2582 return -EFAULT;
2583 res = snd_pcm_oss_set_subdivide(pcm_oss_file, res);
2584 if (res < 0)
2585 return res;
2586 return put_user(res, p);
2587 case SNDCTL_DSP_SETFRAGMENT:
2588 if (get_user(res, p))
2589 return -EFAULT;
2590 return snd_pcm_oss_set_fragment(pcm_oss_file, res);
2591 case SNDCTL_DSP_GETFMTS:
2592 res = snd_pcm_oss_get_formats(pcm_oss_file);
2593 if (res < 0)
2594 return res;
2595 return put_user(res, p);
2596 case SNDCTL_DSP_GETOSPACE:
2597 case SNDCTL_DSP_GETISPACE:
2598 return snd_pcm_oss_get_space(pcm_oss_file,
2599 cmd == SNDCTL_DSP_GETISPACE ?
2600 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2601 (struct audio_buf_info __user *) arg);
2602 case SNDCTL_DSP_NONBLOCK:
2603 return snd_pcm_oss_nonblock(file);
2604 case SNDCTL_DSP_GETCAPS:
2605 res = snd_pcm_oss_get_caps(pcm_oss_file);
2606 if (res < 0)
2607 return res;
2608 return put_user(res, p);
2609 case SNDCTL_DSP_GETTRIGGER:
2610 res = snd_pcm_oss_get_trigger(pcm_oss_file);
2611 if (res < 0)
2612 return res;
2613 return put_user(res, p);
2614 case SNDCTL_DSP_SETTRIGGER:
2615 if (get_user(res, p))
2616 return -EFAULT;
2617 return snd_pcm_oss_set_trigger(pcm_oss_file, res);
2618 case SNDCTL_DSP_GETIPTR:
2619 case SNDCTL_DSP_GETOPTR:
2620 return snd_pcm_oss_get_ptr(pcm_oss_file,
2621 cmd == SNDCTL_DSP_GETIPTR ?
2622 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2623 (struct count_info __user *) arg);
2624 case SNDCTL_DSP_MAPINBUF:
2625 case SNDCTL_DSP_MAPOUTBUF:
2626 return snd_pcm_oss_get_mapbuf(pcm_oss_file,
2627 cmd == SNDCTL_DSP_MAPINBUF ?
2628 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2629 (struct buffmem_desc __user *) arg);
2630 case SNDCTL_DSP_SETSYNCRO:
2631 /* stop DMA now.. */
2632 return 0;
2633 case SNDCTL_DSP_SETDUPLEX:
2634 if (snd_pcm_oss_get_caps(pcm_oss_file) & DSP_CAP_DUPLEX)
2635 return 0;
2636 return -EIO;
2637 case SNDCTL_DSP_GETODELAY:
2638 res = snd_pcm_oss_get_odelay(pcm_oss_file);
2639 if (res < 0) {
2640 /* it's for sure, some broken apps don't check for error codes */
2641 put_user(0, p);
2642 return res;
2643 }
2644 return put_user(res, p);
2645 case SNDCTL_DSP_PROFILE:
2646 return 0; /* silently ignore */
2647 default:
2648 pr_debug("pcm_oss: unknown command = 0x%x\n", cmd);
2649 }
2650 return -EINVAL;
2651 }
2652
2653 #ifdef CONFIG_COMPAT
2654 /* all compatible */
2655 #define snd_pcm_oss_ioctl_compat snd_pcm_oss_ioctl
2656 #else
2657 #define snd_pcm_oss_ioctl_compat NULL
2658 #endif
2659
snd_pcm_oss_read(struct file * file,char __user * buf,size_t count,loff_t * offset)2660 static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
2661 {
2662 struct snd_pcm_oss_file *pcm_oss_file;
2663 struct snd_pcm_substream *substream;
2664
2665 pcm_oss_file = file->private_data;
2666 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2667 if (substream == NULL)
2668 return -ENXIO;
2669 substream->f_flags = file->f_flags & O_NONBLOCK;
2670 #ifndef OSS_DEBUG
2671 return snd_pcm_oss_read1(substream, buf, count);
2672 #else
2673 {
2674 ssize_t res = snd_pcm_oss_read1(substream, buf, count);
2675 pcm_dbg(substream->pcm,
2676 "pcm_oss: read %li bytes (returned %li bytes)\n",
2677 (long)count, (long)res);
2678 return res;
2679 }
2680 #endif
2681 }
2682
snd_pcm_oss_write(struct file * file,const char __user * buf,size_t count,loff_t * offset)2683 static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
2684 {
2685 struct snd_pcm_oss_file *pcm_oss_file;
2686 struct snd_pcm_substream *substream;
2687 long result;
2688
2689 pcm_oss_file = file->private_data;
2690 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2691 if (substream == NULL)
2692 return -ENXIO;
2693 substream->f_flags = file->f_flags & O_NONBLOCK;
2694 result = snd_pcm_oss_write1(substream, buf, count);
2695 #ifdef OSS_DEBUG
2696 pcm_dbg(substream->pcm, "pcm_oss: write %li bytes (wrote %li bytes)\n",
2697 (long)count, (long)result);
2698 #endif
2699 return result;
2700 }
2701
snd_pcm_oss_playback_ready(struct snd_pcm_substream * substream)2702 static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)
2703 {
2704 struct snd_pcm_runtime *runtime = substream->runtime;
2705 if (atomic_read(&substream->mmap_count))
2706 return runtime->oss.prev_hw_ptr_period !=
2707 get_hw_ptr_period(runtime);
2708 else
2709 return snd_pcm_playback_avail(runtime) >=
2710 runtime->oss.period_frames;
2711 }
2712
snd_pcm_oss_capture_ready(struct snd_pcm_substream * substream)2713 static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)
2714 {
2715 struct snd_pcm_runtime *runtime = substream->runtime;
2716 if (atomic_read(&substream->mmap_count))
2717 return runtime->oss.prev_hw_ptr_period !=
2718 get_hw_ptr_period(runtime);
2719 else
2720 return snd_pcm_capture_avail(runtime) >=
2721 runtime->oss.period_frames;
2722 }
2723
snd_pcm_oss_poll(struct file * file,poll_table * wait)2724 static unsigned int snd_pcm_oss_poll(struct file *file, poll_table * wait)
2725 {
2726 struct snd_pcm_oss_file *pcm_oss_file;
2727 unsigned int mask;
2728 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2729
2730 pcm_oss_file = file->private_data;
2731
2732 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2733 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2734
2735 mask = 0;
2736 if (psubstream != NULL) {
2737 struct snd_pcm_runtime *runtime = psubstream->runtime;
2738 poll_wait(file, &runtime->sleep, wait);
2739 snd_pcm_stream_lock_irq(psubstream);
2740 if (runtime->status->state != SNDRV_PCM_STATE_DRAINING &&
2741 (runtime->status->state != SNDRV_PCM_STATE_RUNNING ||
2742 snd_pcm_oss_playback_ready(psubstream)))
2743 mask |= POLLOUT | POLLWRNORM;
2744 snd_pcm_stream_unlock_irq(psubstream);
2745 }
2746 if (csubstream != NULL) {
2747 struct snd_pcm_runtime *runtime = csubstream->runtime;
2748 snd_pcm_state_t ostate;
2749 poll_wait(file, &runtime->sleep, wait);
2750 snd_pcm_stream_lock_irq(csubstream);
2751 if ((ostate = runtime->status->state) != SNDRV_PCM_STATE_RUNNING ||
2752 snd_pcm_oss_capture_ready(csubstream))
2753 mask |= POLLIN | POLLRDNORM;
2754 snd_pcm_stream_unlock_irq(csubstream);
2755 if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) {
2756 struct snd_pcm_oss_file ofile;
2757 memset(&ofile, 0, sizeof(ofile));
2758 ofile.streams[SNDRV_PCM_STREAM_CAPTURE] = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2759 runtime->oss.trigger = 0;
2760 snd_pcm_oss_set_trigger(&ofile, PCM_ENABLE_INPUT);
2761 }
2762 }
2763
2764 return mask;
2765 }
2766
snd_pcm_oss_mmap(struct file * file,struct vm_area_struct * area)2767 static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area)
2768 {
2769 struct snd_pcm_oss_file *pcm_oss_file;
2770 struct snd_pcm_substream *substream = NULL;
2771 struct snd_pcm_runtime *runtime;
2772 int err;
2773
2774 #ifdef OSS_DEBUG
2775 pr_debug("pcm_oss: mmap begin\n");
2776 #endif
2777 pcm_oss_file = file->private_data;
2778 switch ((area->vm_flags & (VM_READ | VM_WRITE))) {
2779 case VM_READ | VM_WRITE:
2780 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2781 if (substream)
2782 break;
2783 /* Fall through */
2784 case VM_READ:
2785 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2786 break;
2787 case VM_WRITE:
2788 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2789 break;
2790 default:
2791 return -EINVAL;
2792 }
2793 /* set VM_READ access as well to fix memset() routines that do
2794 reads before writes (to improve performance) */
2795 area->vm_flags |= VM_READ;
2796 if (substream == NULL)
2797 return -ENXIO;
2798 runtime = substream->runtime;
2799 if (!(runtime->info & SNDRV_PCM_INFO_MMAP_VALID))
2800 return -EIO;
2801 if (runtime->info & SNDRV_PCM_INFO_INTERLEAVED)
2802 runtime->access = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2803 else
2804 return -EIO;
2805
2806 if (runtime->oss.params) {
2807 /* use mutex_trylock() for params_lock for avoiding a deadlock
2808 * between mmap_sem and params_lock taken by
2809 * copy_from/to_user() in snd_pcm_oss_write/read()
2810 */
2811 err = snd_pcm_oss_change_params(substream, true);
2812 if (err < 0)
2813 return err;
2814 }
2815 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2816 if (runtime->oss.plugin_first != NULL)
2817 return -EIO;
2818 #endif
2819
2820 if (area->vm_pgoff != 0)
2821 return -EINVAL;
2822
2823 err = snd_pcm_mmap_data(substream, file, area);
2824 if (err < 0)
2825 return err;
2826 runtime->oss.mmap_bytes = area->vm_end - area->vm_start;
2827 runtime->silence_threshold = 0;
2828 runtime->silence_size = 0;
2829 #ifdef OSS_DEBUG
2830 pr_debug("pcm_oss: mmap ok, bytes = 0x%x\n",
2831 runtime->oss.mmap_bytes);
2832 #endif
2833 /* In mmap mode we never stop */
2834 runtime->stop_threshold = runtime->boundary;
2835
2836 return 0;
2837 }
2838
2839 #ifdef CONFIG_SND_VERBOSE_PROCFS
2840 /*
2841 * /proc interface
2842 */
2843
snd_pcm_oss_proc_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)2844 static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
2845 struct snd_info_buffer *buffer)
2846 {
2847 struct snd_pcm_str *pstr = entry->private_data;
2848 struct snd_pcm_oss_setup *setup = pstr->oss.setup_list;
2849 mutex_lock(&pstr->oss.setup_mutex);
2850 while (setup) {
2851 snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s\n",
2852 setup->task_name,
2853 setup->periods,
2854 setup->period_size,
2855 setup->disable ? " disable" : "",
2856 setup->direct ? " direct" : "",
2857 setup->block ? " block" : "",
2858 setup->nonblock ? " non-block" : "",
2859 setup->partialfrag ? " partial-frag" : "",
2860 setup->nosilence ? " no-silence" : "");
2861 setup = setup->next;
2862 }
2863 mutex_unlock(&pstr->oss.setup_mutex);
2864 }
2865
snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)2866 static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)
2867 {
2868 struct snd_pcm_oss_setup *setup, *setupn;
2869
2870 for (setup = pstr->oss.setup_list, pstr->oss.setup_list = NULL;
2871 setup; setup = setupn) {
2872 setupn = setup->next;
2873 kfree(setup->task_name);
2874 kfree(setup);
2875 }
2876 pstr->oss.setup_list = NULL;
2877 }
2878
snd_pcm_oss_proc_write(struct snd_info_entry * entry,struct snd_info_buffer * buffer)2879 static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
2880 struct snd_info_buffer *buffer)
2881 {
2882 struct snd_pcm_str *pstr = entry->private_data;
2883 char line[128], str[32], task_name[32];
2884 const char *ptr;
2885 int idx1;
2886 struct snd_pcm_oss_setup *setup, *setup1, template;
2887
2888 while (!snd_info_get_line(buffer, line, sizeof(line))) {
2889 mutex_lock(&pstr->oss.setup_mutex);
2890 memset(&template, 0, sizeof(template));
2891 ptr = snd_info_get_str(task_name, line, sizeof(task_name));
2892 if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) {
2893 snd_pcm_oss_proc_free_setup_list(pstr);
2894 mutex_unlock(&pstr->oss.setup_mutex);
2895 continue;
2896 }
2897 for (setup = pstr->oss.setup_list; setup; setup = setup->next) {
2898 if (!strcmp(setup->task_name, task_name)) {
2899 template = *setup;
2900 break;
2901 }
2902 }
2903 ptr = snd_info_get_str(str, ptr, sizeof(str));
2904 template.periods = simple_strtoul(str, NULL, 10);
2905 ptr = snd_info_get_str(str, ptr, sizeof(str));
2906 template.period_size = simple_strtoul(str, NULL, 10);
2907 for (idx1 = 31; idx1 >= 0; idx1--)
2908 if (template.period_size & (1 << idx1))
2909 break;
2910 for (idx1--; idx1 >= 0; idx1--)
2911 template.period_size &= ~(1 << idx1);
2912 do {
2913 ptr = snd_info_get_str(str, ptr, sizeof(str));
2914 if (!strcmp(str, "disable")) {
2915 template.disable = 1;
2916 } else if (!strcmp(str, "direct")) {
2917 template.direct = 1;
2918 } else if (!strcmp(str, "block")) {
2919 template.block = 1;
2920 } else if (!strcmp(str, "non-block")) {
2921 template.nonblock = 1;
2922 } else if (!strcmp(str, "partial-frag")) {
2923 template.partialfrag = 1;
2924 } else if (!strcmp(str, "no-silence")) {
2925 template.nosilence = 1;
2926 } else if (!strcmp(str, "buggy-ptr")) {
2927 template.buggyptr = 1;
2928 }
2929 } while (*str);
2930 if (setup == NULL) {
2931 setup = kmalloc(sizeof(*setup), GFP_KERNEL);
2932 if (! setup) {
2933 buffer->error = -ENOMEM;
2934 mutex_unlock(&pstr->oss.setup_mutex);
2935 return;
2936 }
2937 if (pstr->oss.setup_list == NULL)
2938 pstr->oss.setup_list = setup;
2939 else {
2940 for (setup1 = pstr->oss.setup_list;
2941 setup1->next; setup1 = setup1->next);
2942 setup1->next = setup;
2943 }
2944 template.task_name = kstrdup(task_name, GFP_KERNEL);
2945 if (! template.task_name) {
2946 kfree(setup);
2947 buffer->error = -ENOMEM;
2948 mutex_unlock(&pstr->oss.setup_mutex);
2949 return;
2950 }
2951 }
2952 *setup = template;
2953 mutex_unlock(&pstr->oss.setup_mutex);
2954 }
2955 }
2956
snd_pcm_oss_proc_init(struct snd_pcm * pcm)2957 static void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
2958 {
2959 int stream;
2960 for (stream = 0; stream < 2; ++stream) {
2961 struct snd_info_entry *entry;
2962 struct snd_pcm_str *pstr = &pcm->streams[stream];
2963 if (pstr->substream_count == 0)
2964 continue;
2965 if ((entry = snd_info_create_card_entry(pcm->card, "oss", pstr->proc_root)) != NULL) {
2966 entry->content = SNDRV_INFO_CONTENT_TEXT;
2967 entry->mode = S_IFREG | S_IRUGO | S_IWUSR;
2968 entry->c.text.read = snd_pcm_oss_proc_read;
2969 entry->c.text.write = snd_pcm_oss_proc_write;
2970 entry->private_data = pstr;
2971 if (snd_info_register(entry) < 0) {
2972 snd_info_free_entry(entry);
2973 entry = NULL;
2974 }
2975 }
2976 pstr->oss.proc_entry = entry;
2977 }
2978 }
2979
snd_pcm_oss_proc_done(struct snd_pcm * pcm)2980 static void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
2981 {
2982 int stream;
2983 for (stream = 0; stream < 2; ++stream) {
2984 struct snd_pcm_str *pstr = &pcm->streams[stream];
2985 snd_info_free_entry(pstr->oss.proc_entry);
2986 pstr->oss.proc_entry = NULL;
2987 snd_pcm_oss_proc_free_setup_list(pstr);
2988 }
2989 }
2990 #else /* !CONFIG_SND_VERBOSE_PROCFS */
2991 #define snd_pcm_oss_proc_init(pcm)
2992 #define snd_pcm_oss_proc_done(pcm)
2993 #endif /* CONFIG_SND_VERBOSE_PROCFS */
2994
2995 /*
2996 * ENTRY functions
2997 */
2998
2999 static const struct file_operations snd_pcm_oss_f_reg =
3000 {
3001 .owner = THIS_MODULE,
3002 .read = snd_pcm_oss_read,
3003 .write = snd_pcm_oss_write,
3004 .open = snd_pcm_oss_open,
3005 .release = snd_pcm_oss_release,
3006 .llseek = no_llseek,
3007 .poll = snd_pcm_oss_poll,
3008 .unlocked_ioctl = snd_pcm_oss_ioctl,
3009 .compat_ioctl = snd_pcm_oss_ioctl_compat,
3010 .mmap = snd_pcm_oss_mmap,
3011 };
3012
register_oss_dsp(struct snd_pcm * pcm,int index)3013 static void register_oss_dsp(struct snd_pcm *pcm, int index)
3014 {
3015 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3016 pcm->card, index, &snd_pcm_oss_f_reg,
3017 pcm) < 0) {
3018 pcm_err(pcm, "unable to register OSS PCM device %i:%i\n",
3019 pcm->card->number, pcm->device);
3020 }
3021 }
3022
snd_pcm_oss_register_minor(struct snd_pcm * pcm)3023 static int snd_pcm_oss_register_minor(struct snd_pcm *pcm)
3024 {
3025 pcm->oss.reg = 0;
3026 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3027 char name[128];
3028 int duplex;
3029 register_oss_dsp(pcm, 0);
3030 duplex = (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count > 0 &&
3031 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count &&
3032 !(pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX));
3033 sprintf(name, "%s%s", pcm->name, duplex ? " (DUPLEX)" : "");
3034 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3035 snd_oss_info_register(SNDRV_OSS_INFO_DEV_AUDIO,
3036 pcm->card->number,
3037 name);
3038 #endif
3039 pcm->oss.reg++;
3040 pcm->oss.reg_mask |= 1;
3041 }
3042 if (adsp_map[pcm->card->number] == (int)pcm->device) {
3043 register_oss_dsp(pcm, 1);
3044 pcm->oss.reg++;
3045 pcm->oss.reg_mask |= 2;
3046 }
3047
3048 if (pcm->oss.reg)
3049 snd_pcm_oss_proc_init(pcm);
3050
3051 return 0;
3052 }
3053
snd_pcm_oss_disconnect_minor(struct snd_pcm * pcm)3054 static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm)
3055 {
3056 if (pcm->oss.reg) {
3057 if (pcm->oss.reg_mask & 1) {
3058 pcm->oss.reg_mask &= ~1;
3059 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3060 pcm->card, 0);
3061 }
3062 if (pcm->oss.reg_mask & 2) {
3063 pcm->oss.reg_mask &= ~2;
3064 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3065 pcm->card, 1);
3066 }
3067 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3068 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3069 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number);
3070 #endif
3071 }
3072 pcm->oss.reg = 0;
3073 }
3074 return 0;
3075 }
3076
snd_pcm_oss_unregister_minor(struct snd_pcm * pcm)3077 static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm)
3078 {
3079 snd_pcm_oss_disconnect_minor(pcm);
3080 snd_pcm_oss_proc_done(pcm);
3081 return 0;
3082 }
3083
3084 static struct snd_pcm_notify snd_pcm_oss_notify =
3085 {
3086 .n_register = snd_pcm_oss_register_minor,
3087 .n_disconnect = snd_pcm_oss_disconnect_minor,
3088 .n_unregister = snd_pcm_oss_unregister_minor,
3089 };
3090
alsa_pcm_oss_init(void)3091 static int __init alsa_pcm_oss_init(void)
3092 {
3093 int i;
3094 int err;
3095
3096 /* check device map table */
3097 for (i = 0; i < SNDRV_CARDS; i++) {
3098 if (dsp_map[i] < 0 || dsp_map[i] >= SNDRV_PCM_DEVICES) {
3099 pr_err("ALSA: pcm_oss: invalid dsp_map[%d] = %d\n",
3100 i, dsp_map[i]);
3101 dsp_map[i] = 0;
3102 }
3103 if (adsp_map[i] < 0 || adsp_map[i] >= SNDRV_PCM_DEVICES) {
3104 pr_err("ALSA: pcm_oss: invalid adsp_map[%d] = %d\n",
3105 i, adsp_map[i]);
3106 adsp_map[i] = 1;
3107 }
3108 }
3109 if ((err = snd_pcm_notify(&snd_pcm_oss_notify, 0)) < 0)
3110 return err;
3111 return 0;
3112 }
3113
alsa_pcm_oss_exit(void)3114 static void __exit alsa_pcm_oss_exit(void)
3115 {
3116 snd_pcm_notify(&snd_pcm_oss_notify, 1);
3117 }
3118
3119 module_init(alsa_pcm_oss_init)
3120 module_exit(alsa_pcm_oss_exit)
3121