1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Digital Audio (PCM) abstract layer / OSS compatible
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5 */
6
7 #if 0
8 #define PLUGIN_DEBUG
9 #endif
10 #if 0
11 #define OSS_DEBUG
12 #endif
13
14 #include <linux/init.h>
15 #include <linux/slab.h>
16 #include <linux/sched/signal.h>
17 #include <linux/time.h>
18 #include <linux/vmalloc.h>
19 #include <linux/module.h>
20 #include <linux/math64.h>
21 #include <linux/string.h>
22 #include <linux/compat.h>
23 #include <sound/core.h>
24 #include <sound/minors.h>
25 #include <sound/pcm.h>
26 #include <sound/pcm_params.h>
27 #include "pcm_plugin.h"
28 #include <sound/info.h>
29 #include <linux/soundcard.h>
30 #include <sound/initval.h>
31 #include <sound/mixer_oss.h>
32
33 #define OSS_ALSAEMULVER _SIOR ('M', 249, int)
34
35 static int dsp_map[SNDRV_CARDS];
36 static int adsp_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
37 static bool nonblock_open = 1;
38
39 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
40 MODULE_DESCRIPTION("PCM OSS emulation for ALSA.");
41 MODULE_LICENSE("GPL");
42 module_param_array(dsp_map, int, NULL, 0444);
43 MODULE_PARM_DESC(dsp_map, "PCM device number assigned to 1st OSS device.");
44 module_param_array(adsp_map, int, NULL, 0444);
45 MODULE_PARM_DESC(adsp_map, "PCM device number assigned to 2nd OSS device.");
46 module_param(nonblock_open, bool, 0644);
47 MODULE_PARM_DESC(nonblock_open, "Don't block opening busy PCM devices.");
48 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM);
49 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM1);
50
51 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file);
52 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file);
53 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file);
54
55 /*
56 * helper functions to process hw_params
57 */
snd_interval_refine_min(struct snd_interval * i,unsigned int min,int openmin)58 static int snd_interval_refine_min(struct snd_interval *i, unsigned int min, int openmin)
59 {
60 int changed = 0;
61 if (i->min < min) {
62 i->min = min;
63 i->openmin = openmin;
64 changed = 1;
65 } else if (i->min == min && !i->openmin && openmin) {
66 i->openmin = 1;
67 changed = 1;
68 }
69 if (i->integer) {
70 if (i->openmin) {
71 i->min++;
72 i->openmin = 0;
73 }
74 }
75 if (snd_interval_checkempty(i)) {
76 snd_interval_none(i);
77 return -EINVAL;
78 }
79 return changed;
80 }
81
snd_interval_refine_max(struct snd_interval * i,unsigned int max,int openmax)82 static int snd_interval_refine_max(struct snd_interval *i, unsigned int max, int openmax)
83 {
84 int changed = 0;
85 if (i->max > max) {
86 i->max = max;
87 i->openmax = openmax;
88 changed = 1;
89 } else if (i->max == max && !i->openmax && openmax) {
90 i->openmax = 1;
91 changed = 1;
92 }
93 if (i->integer) {
94 if (i->openmax) {
95 i->max--;
96 i->openmax = 0;
97 }
98 }
99 if (snd_interval_checkempty(i)) {
100 snd_interval_none(i);
101 return -EINVAL;
102 }
103 return changed;
104 }
105
snd_interval_refine_set(struct snd_interval * i,unsigned int val)106 static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
107 {
108 struct snd_interval t;
109 t.empty = 0;
110 t.min = t.max = val;
111 t.openmin = t.openmax = 0;
112 t.integer = 1;
113 return snd_interval_refine(i, &t);
114 }
115
116 /**
117 * snd_pcm_hw_param_value_min
118 * @params: the hw_params instance
119 * @var: parameter to retrieve
120 * @dir: pointer to the direction (-1,0,1) or NULL
121 *
122 * Return the minimum value for field PAR.
123 */
124 static unsigned int
snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,int * dir)125 snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params *params,
126 snd_pcm_hw_param_t var, int *dir)
127 {
128 if (hw_is_mask(var)) {
129 if (dir)
130 *dir = 0;
131 return snd_mask_min(hw_param_mask_c(params, var));
132 }
133 if (hw_is_interval(var)) {
134 const struct snd_interval *i = hw_param_interval_c(params, var);
135 if (dir)
136 *dir = i->openmin;
137 return snd_interval_min(i);
138 }
139 return -EINVAL;
140 }
141
142 /**
143 * snd_pcm_hw_param_value_max
144 * @params: the hw_params instance
145 * @var: parameter to retrieve
146 * @dir: pointer to the direction (-1,0,1) or NULL
147 *
148 * Return the maximum value for field PAR.
149 */
150 static unsigned int
snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,int * dir)151 snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params *params,
152 snd_pcm_hw_param_t var, int *dir)
153 {
154 if (hw_is_mask(var)) {
155 if (dir)
156 *dir = 0;
157 return snd_mask_max(hw_param_mask_c(params, var));
158 }
159 if (hw_is_interval(var)) {
160 const struct snd_interval *i = hw_param_interval_c(params, var);
161 if (dir)
162 *dir = - (int) i->openmax;
163 return snd_interval_max(i);
164 }
165 return -EINVAL;
166 }
167
_snd_pcm_hw_param_mask(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,const struct snd_mask * val)168 static int _snd_pcm_hw_param_mask(struct snd_pcm_hw_params *params,
169 snd_pcm_hw_param_t var,
170 const struct snd_mask *val)
171 {
172 int changed;
173 changed = snd_mask_refine(hw_param_mask(params, var), val);
174 if (changed > 0) {
175 params->cmask |= 1 << var;
176 params->rmask |= 1 << var;
177 }
178 return changed;
179 }
180
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)181 static int snd_pcm_hw_param_mask(struct snd_pcm_substream *pcm,
182 struct snd_pcm_hw_params *params,
183 snd_pcm_hw_param_t var,
184 const struct snd_mask *val)
185 {
186 int changed = _snd_pcm_hw_param_mask(params, var, val);
187 if (changed < 0)
188 return changed;
189 if (params->rmask) {
190 int err = snd_pcm_hw_refine(pcm, params);
191 if (err < 0)
192 return err;
193 }
194 return 0;
195 }
196
_snd_pcm_hw_param_min(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int val,int dir)197 static int _snd_pcm_hw_param_min(struct snd_pcm_hw_params *params,
198 snd_pcm_hw_param_t var, unsigned int val,
199 int dir)
200 {
201 int changed;
202 int open = 0;
203 if (dir) {
204 if (dir > 0) {
205 open = 1;
206 } else if (dir < 0) {
207 if (val > 0) {
208 open = 1;
209 val--;
210 }
211 }
212 }
213 if (hw_is_mask(var))
214 changed = snd_mask_refine_min(hw_param_mask(params, var),
215 val + !!open);
216 else if (hw_is_interval(var))
217 changed = snd_interval_refine_min(hw_param_interval(params, var),
218 val, open);
219 else
220 return -EINVAL;
221 if (changed > 0) {
222 params->cmask |= 1 << var;
223 params->rmask |= 1 << var;
224 }
225 return changed;
226 }
227
228 /**
229 * snd_pcm_hw_param_min
230 * @pcm: PCM instance
231 * @params: the hw_params instance
232 * @var: parameter to retrieve
233 * @val: minimal value
234 * @dir: pointer to the direction (-1,0,1) or NULL
235 *
236 * Inside configuration space defined by PARAMS remove from PAR all
237 * values < VAL. Reduce configuration space accordingly.
238 * Return new minimum or -EINVAL if the configuration space is empty
239 */
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)240 static int snd_pcm_hw_param_min(struct snd_pcm_substream *pcm,
241 struct snd_pcm_hw_params *params,
242 snd_pcm_hw_param_t var, unsigned int val,
243 int *dir)
244 {
245 int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
246 if (changed < 0)
247 return changed;
248 if (params->rmask) {
249 int err = snd_pcm_hw_refine(pcm, params);
250 if (err < 0)
251 return err;
252 }
253 return snd_pcm_hw_param_value_min(params, var, dir);
254 }
255
_snd_pcm_hw_param_max(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int val,int dir)256 static int _snd_pcm_hw_param_max(struct snd_pcm_hw_params *params,
257 snd_pcm_hw_param_t var, unsigned int val,
258 int dir)
259 {
260 int changed;
261 int open = 0;
262 if (dir) {
263 if (dir < 0) {
264 open = 1;
265 } else if (dir > 0) {
266 open = 1;
267 val++;
268 }
269 }
270 if (hw_is_mask(var)) {
271 if (val == 0 && open) {
272 snd_mask_none(hw_param_mask(params, var));
273 changed = -EINVAL;
274 } else
275 changed = snd_mask_refine_max(hw_param_mask(params, var),
276 val - !!open);
277 } else if (hw_is_interval(var))
278 changed = snd_interval_refine_max(hw_param_interval(params, var),
279 val, open);
280 else
281 return -EINVAL;
282 if (changed > 0) {
283 params->cmask |= 1 << var;
284 params->rmask |= 1 << var;
285 }
286 return changed;
287 }
288
289 /**
290 * snd_pcm_hw_param_max
291 * @pcm: PCM instance
292 * @params: the hw_params instance
293 * @var: parameter to retrieve
294 * @val: maximal value
295 * @dir: pointer to the direction (-1,0,1) or NULL
296 *
297 * Inside configuration space defined by PARAMS remove from PAR all
298 * values >= VAL + 1. Reduce configuration space accordingly.
299 * Return new maximum or -EINVAL if the configuration space is empty
300 */
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)301 static int snd_pcm_hw_param_max(struct snd_pcm_substream *pcm,
302 struct snd_pcm_hw_params *params,
303 snd_pcm_hw_param_t var, unsigned int val,
304 int *dir)
305 {
306 int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
307 if (changed < 0)
308 return changed;
309 if (params->rmask) {
310 int err = snd_pcm_hw_refine(pcm, params);
311 if (err < 0)
312 return err;
313 }
314 return snd_pcm_hw_param_value_max(params, var, dir);
315 }
316
boundary_sub(int a,int adir,int b,int bdir,int * c,int * cdir)317 static int boundary_sub(int a, int adir,
318 int b, int bdir,
319 int *c, int *cdir)
320 {
321 adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
322 bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
323 *c = a - b;
324 *cdir = adir - bdir;
325 if (*cdir == -2) {
326 (*c)--;
327 } else if (*cdir == 2) {
328 (*c)++;
329 }
330 return 0;
331 }
332
boundary_lt(unsigned int a,int adir,unsigned int b,int bdir)333 static int boundary_lt(unsigned int a, int adir,
334 unsigned int b, int bdir)
335 {
336 if (adir < 0) {
337 a--;
338 adir = 1;
339 } else if (adir > 0)
340 adir = 1;
341 if (bdir < 0) {
342 b--;
343 bdir = 1;
344 } else if (bdir > 0)
345 bdir = 1;
346 return a < b || (a == b && adir < bdir);
347 }
348
349 /* Return 1 if min is nearer to best than max */
boundary_nearer(int min,int mindir,int best,int bestdir,int max,int maxdir)350 static int boundary_nearer(int min, int mindir,
351 int best, int bestdir,
352 int max, int maxdir)
353 {
354 int dmin, dmindir;
355 int dmax, dmaxdir;
356 boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
357 boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
358 return boundary_lt(dmin, dmindir, dmax, dmaxdir);
359 }
360
361 /**
362 * snd_pcm_hw_param_near
363 * @pcm: PCM instance
364 * @params: the hw_params instance
365 * @var: parameter to retrieve
366 * @best: value to set
367 * @dir: pointer to the direction (-1,0,1) or NULL
368 *
369 * Inside configuration space defined by PARAMS set PAR to the available value
370 * nearest to VAL. Reduce configuration space accordingly.
371 * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
372 * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
373 * Return the value found.
374 */
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)375 static int snd_pcm_hw_param_near(struct snd_pcm_substream *pcm,
376 struct snd_pcm_hw_params *params,
377 snd_pcm_hw_param_t var, unsigned int best,
378 int *dir)
379 {
380 struct snd_pcm_hw_params *save = NULL;
381 int v;
382 unsigned int saved_min;
383 int last = 0;
384 int min, max;
385 int mindir, maxdir;
386 int valdir = dir ? *dir : 0;
387 /* FIXME */
388 if (best > INT_MAX)
389 best = INT_MAX;
390 min = max = best;
391 mindir = maxdir = valdir;
392 if (maxdir > 0)
393 maxdir = 0;
394 else if (maxdir == 0)
395 maxdir = -1;
396 else {
397 maxdir = 1;
398 max--;
399 }
400 save = kmalloc(sizeof(*save), GFP_KERNEL);
401 if (save == NULL)
402 return -ENOMEM;
403 *save = *params;
404 saved_min = min;
405 min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
406 if (min >= 0) {
407 struct snd_pcm_hw_params *params1;
408 if (max < 0)
409 goto _end;
410 if ((unsigned int)min == saved_min && mindir == valdir)
411 goto _end;
412 params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
413 if (params1 == NULL) {
414 kfree(save);
415 return -ENOMEM;
416 }
417 *params1 = *save;
418 max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
419 if (max < 0) {
420 kfree(params1);
421 goto _end;
422 }
423 if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
424 *params = *params1;
425 last = 1;
426 }
427 kfree(params1);
428 } else {
429 *params = *save;
430 max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
431 if (max < 0) {
432 kfree(save);
433 return max;
434 }
435 last = 1;
436 }
437 _end:
438 kfree(save);
439 if (last)
440 v = snd_pcm_hw_param_last(pcm, params, var, dir);
441 else
442 v = snd_pcm_hw_param_first(pcm, params, var, dir);
443 return v;
444 }
445
_snd_pcm_hw_param_set(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int val,int dir)446 static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
447 snd_pcm_hw_param_t var, unsigned int val,
448 int dir)
449 {
450 int changed;
451 if (hw_is_mask(var)) {
452 struct snd_mask *m = hw_param_mask(params, var);
453 if (val == 0 && dir < 0) {
454 changed = -EINVAL;
455 snd_mask_none(m);
456 } else {
457 if (dir > 0)
458 val++;
459 else if (dir < 0)
460 val--;
461 changed = snd_mask_refine_set(hw_param_mask(params, var), val);
462 }
463 } else if (hw_is_interval(var)) {
464 struct snd_interval *i = hw_param_interval(params, var);
465 if (val == 0 && dir < 0) {
466 changed = -EINVAL;
467 snd_interval_none(i);
468 } else if (dir == 0)
469 changed = snd_interval_refine_set(i, val);
470 else {
471 struct snd_interval t;
472 t.openmin = 1;
473 t.openmax = 1;
474 t.empty = 0;
475 t.integer = 0;
476 if (dir < 0) {
477 t.min = val - 1;
478 t.max = val;
479 } else {
480 t.min = val;
481 t.max = val+1;
482 }
483 changed = snd_interval_refine(i, &t);
484 }
485 } else
486 return -EINVAL;
487 if (changed > 0) {
488 params->cmask |= 1 << var;
489 params->rmask |= 1 << var;
490 }
491 return changed;
492 }
493
494 /**
495 * snd_pcm_hw_param_set
496 * @pcm: PCM instance
497 * @params: the hw_params instance
498 * @var: parameter to retrieve
499 * @val: value to set
500 * @dir: pointer to the direction (-1,0,1) or NULL
501 *
502 * Inside configuration space defined by PARAMS remove from PAR all
503 * values != VAL. Reduce configuration space accordingly.
504 * Return VAL or -EINVAL if the configuration space is empty
505 */
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)506 static int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm,
507 struct snd_pcm_hw_params *params,
508 snd_pcm_hw_param_t var, unsigned int val,
509 int dir)
510 {
511 int changed = _snd_pcm_hw_param_set(params, var, val, dir);
512 if (changed < 0)
513 return changed;
514 if (params->rmask) {
515 int err = snd_pcm_hw_refine(pcm, params);
516 if (err < 0)
517 return err;
518 }
519 return snd_pcm_hw_param_value(params, var, NULL);
520 }
521
_snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var)522 static int _snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params *params,
523 snd_pcm_hw_param_t var)
524 {
525 int changed;
526 changed = snd_interval_setinteger(hw_param_interval(params, var));
527 if (changed > 0) {
528 params->cmask |= 1 << var;
529 params->rmask |= 1 << var;
530 }
531 return changed;
532 }
533
534 /*
535 * plugin
536 */
537
538 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
snd_pcm_oss_plugin_clear(struct snd_pcm_substream * substream)539 static int snd_pcm_oss_plugin_clear(struct snd_pcm_substream *substream)
540 {
541 struct snd_pcm_runtime *runtime = substream->runtime;
542 struct snd_pcm_plugin *plugin, *next;
543
544 plugin = runtime->oss.plugin_first;
545 while (plugin) {
546 next = plugin->next;
547 snd_pcm_plugin_free(plugin);
548 plugin = next;
549 }
550 runtime->oss.plugin_first = runtime->oss.plugin_last = NULL;
551 return 0;
552 }
553
snd_pcm_plugin_insert(struct snd_pcm_plugin * plugin)554 static int snd_pcm_plugin_insert(struct snd_pcm_plugin *plugin)
555 {
556 struct snd_pcm_runtime *runtime = plugin->plug->runtime;
557 plugin->next = runtime->oss.plugin_first;
558 plugin->prev = NULL;
559 if (runtime->oss.plugin_first) {
560 runtime->oss.plugin_first->prev = plugin;
561 runtime->oss.plugin_first = plugin;
562 } else {
563 runtime->oss.plugin_last =
564 runtime->oss.plugin_first = plugin;
565 }
566 return 0;
567 }
568
snd_pcm_plugin_append(struct snd_pcm_plugin * plugin)569 int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin)
570 {
571 struct snd_pcm_runtime *runtime = plugin->plug->runtime;
572 plugin->next = NULL;
573 plugin->prev = runtime->oss.plugin_last;
574 if (runtime->oss.plugin_last) {
575 runtime->oss.plugin_last->next = plugin;
576 runtime->oss.plugin_last = plugin;
577 } else {
578 runtime->oss.plugin_last =
579 runtime->oss.plugin_first = plugin;
580 }
581 return 0;
582 }
583 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
584
snd_pcm_oss_bytes(struct snd_pcm_substream * substream,long frames)585 static long snd_pcm_oss_bytes(struct snd_pcm_substream *substream, long frames)
586 {
587 struct snd_pcm_runtime *runtime = substream->runtime;
588 long buffer_size = snd_pcm_lib_buffer_bytes(substream);
589 long bytes = frames_to_bytes(runtime, frames);
590 if (buffer_size == runtime->oss.buffer_bytes)
591 return bytes;
592 #if BITS_PER_LONG >= 64
593 return runtime->oss.buffer_bytes * bytes / buffer_size;
594 #else
595 {
596 u64 bsize = (u64)runtime->oss.buffer_bytes * (u64)bytes;
597 return div_u64(bsize, buffer_size);
598 }
599 #endif
600 }
601
snd_pcm_alsa_frames(struct snd_pcm_substream * substream,long bytes)602 static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes)
603 {
604 struct snd_pcm_runtime *runtime = substream->runtime;
605 long buffer_size = snd_pcm_lib_buffer_bytes(substream);
606 if (buffer_size == runtime->oss.buffer_bytes)
607 return bytes_to_frames(runtime, bytes);
608 return bytes_to_frames(runtime, (buffer_size * bytes) / runtime->oss.buffer_bytes);
609 }
610
611 static inline
get_hw_ptr_period(struct snd_pcm_runtime * runtime)612 snd_pcm_uframes_t get_hw_ptr_period(struct snd_pcm_runtime *runtime)
613 {
614 return runtime->hw_ptr_interrupt;
615 }
616
617 /* define extended formats in the recent OSS versions (if any) */
618 /* linear formats */
619 #define AFMT_S32_LE 0x00001000
620 #define AFMT_S32_BE 0x00002000
621 #define AFMT_S24_LE 0x00008000
622 #define AFMT_S24_BE 0x00010000
623 #define AFMT_S24_PACKED 0x00040000
624
625 /* other supported formats */
626 #define AFMT_FLOAT 0x00004000
627 #define AFMT_SPDIF_RAW 0x00020000
628
629 /* unsupported formats */
630 #define AFMT_AC3 0x00000400
631 #define AFMT_VORBIS 0x00000800
632
snd_pcm_oss_format_from(int format)633 static snd_pcm_format_t snd_pcm_oss_format_from(int format)
634 {
635 switch (format) {
636 case AFMT_MU_LAW: return SNDRV_PCM_FORMAT_MU_LAW;
637 case AFMT_A_LAW: return SNDRV_PCM_FORMAT_A_LAW;
638 case AFMT_IMA_ADPCM: return SNDRV_PCM_FORMAT_IMA_ADPCM;
639 case AFMT_U8: return SNDRV_PCM_FORMAT_U8;
640 case AFMT_S16_LE: return SNDRV_PCM_FORMAT_S16_LE;
641 case AFMT_S16_BE: return SNDRV_PCM_FORMAT_S16_BE;
642 case AFMT_S8: return SNDRV_PCM_FORMAT_S8;
643 case AFMT_U16_LE: return SNDRV_PCM_FORMAT_U16_LE;
644 case AFMT_U16_BE: return SNDRV_PCM_FORMAT_U16_BE;
645 case AFMT_MPEG: return SNDRV_PCM_FORMAT_MPEG;
646 case AFMT_S32_LE: return SNDRV_PCM_FORMAT_S32_LE;
647 case AFMT_S32_BE: return SNDRV_PCM_FORMAT_S32_BE;
648 case AFMT_S24_LE: return SNDRV_PCM_FORMAT_S24_LE;
649 case AFMT_S24_BE: return SNDRV_PCM_FORMAT_S24_BE;
650 case AFMT_S24_PACKED: return SNDRV_PCM_FORMAT_S24_3LE;
651 case AFMT_FLOAT: return SNDRV_PCM_FORMAT_FLOAT;
652 case AFMT_SPDIF_RAW: return SNDRV_PCM_FORMAT_IEC958_SUBFRAME;
653 default: return SNDRV_PCM_FORMAT_U8;
654 }
655 }
656
snd_pcm_oss_format_to(snd_pcm_format_t format)657 static int snd_pcm_oss_format_to(snd_pcm_format_t format)
658 {
659 switch (format) {
660 case SNDRV_PCM_FORMAT_MU_LAW: return AFMT_MU_LAW;
661 case SNDRV_PCM_FORMAT_A_LAW: return AFMT_A_LAW;
662 case SNDRV_PCM_FORMAT_IMA_ADPCM: return AFMT_IMA_ADPCM;
663 case SNDRV_PCM_FORMAT_U8: return AFMT_U8;
664 case SNDRV_PCM_FORMAT_S16_LE: return AFMT_S16_LE;
665 case SNDRV_PCM_FORMAT_S16_BE: return AFMT_S16_BE;
666 case SNDRV_PCM_FORMAT_S8: return AFMT_S8;
667 case SNDRV_PCM_FORMAT_U16_LE: return AFMT_U16_LE;
668 case SNDRV_PCM_FORMAT_U16_BE: return AFMT_U16_BE;
669 case SNDRV_PCM_FORMAT_MPEG: return AFMT_MPEG;
670 case SNDRV_PCM_FORMAT_S32_LE: return AFMT_S32_LE;
671 case SNDRV_PCM_FORMAT_S32_BE: return AFMT_S32_BE;
672 case SNDRV_PCM_FORMAT_S24_LE: return AFMT_S24_LE;
673 case SNDRV_PCM_FORMAT_S24_BE: return AFMT_S24_BE;
674 case SNDRV_PCM_FORMAT_S24_3LE: return AFMT_S24_PACKED;
675 case SNDRV_PCM_FORMAT_FLOAT: return AFMT_FLOAT;
676 case SNDRV_PCM_FORMAT_IEC958_SUBFRAME: return AFMT_SPDIF_RAW;
677 default: return -EINVAL;
678 }
679 }
680
snd_pcm_oss_period_size(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * oss_params,struct snd_pcm_hw_params * slave_params)681 static int snd_pcm_oss_period_size(struct snd_pcm_substream *substream,
682 struct snd_pcm_hw_params *oss_params,
683 struct snd_pcm_hw_params *slave_params)
684 {
685 size_t s;
686 size_t oss_buffer_size, oss_period_size, oss_periods;
687 size_t min_period_size, max_period_size;
688 struct snd_pcm_runtime *runtime = substream->runtime;
689 size_t oss_frame_size;
690
691 oss_frame_size = snd_pcm_format_physical_width(params_format(oss_params)) *
692 params_channels(oss_params) / 8;
693
694 oss_buffer_size = snd_pcm_plug_client_size(substream,
695 snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, NULL)) * oss_frame_size;
696 if (!oss_buffer_size)
697 return -EINVAL;
698 oss_buffer_size = rounddown_pow_of_two(oss_buffer_size);
699 if (atomic_read(&substream->mmap_count)) {
700 if (oss_buffer_size > runtime->oss.mmap_bytes)
701 oss_buffer_size = runtime->oss.mmap_bytes;
702 }
703
704 if (substream->oss.setup.period_size > 16)
705 oss_period_size = substream->oss.setup.period_size;
706 else if (runtime->oss.fragshift) {
707 oss_period_size = 1 << runtime->oss.fragshift;
708 if (oss_period_size > oss_buffer_size / 2)
709 oss_period_size = oss_buffer_size / 2;
710 } else {
711 int sd;
712 size_t bytes_per_sec = params_rate(oss_params) * snd_pcm_format_physical_width(params_format(oss_params)) * params_channels(oss_params) / 8;
713
714 oss_period_size = oss_buffer_size;
715 do {
716 oss_period_size /= 2;
717 } while (oss_period_size > bytes_per_sec);
718 if (runtime->oss.subdivision == 0) {
719 sd = 4;
720 if (oss_period_size / sd > 4096)
721 sd *= 2;
722 if (oss_period_size / sd < 4096)
723 sd = 1;
724 } else
725 sd = runtime->oss.subdivision;
726 oss_period_size /= sd;
727 if (oss_period_size < 16)
728 oss_period_size = 16;
729 }
730
731 min_period_size = snd_pcm_plug_client_size(substream,
732 snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
733 if (min_period_size) {
734 min_period_size *= oss_frame_size;
735 min_period_size = roundup_pow_of_two(min_period_size);
736 if (oss_period_size < min_period_size)
737 oss_period_size = min_period_size;
738 }
739
740 max_period_size = snd_pcm_plug_client_size(substream,
741 snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
742 if (max_period_size) {
743 max_period_size *= oss_frame_size;
744 max_period_size = rounddown_pow_of_two(max_period_size);
745 if (oss_period_size > max_period_size)
746 oss_period_size = max_period_size;
747 }
748
749 oss_periods = oss_buffer_size / oss_period_size;
750
751 if (substream->oss.setup.periods > 1)
752 oss_periods = substream->oss.setup.periods;
753
754 s = snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
755 if (runtime->oss.maxfrags && s > runtime->oss.maxfrags)
756 s = runtime->oss.maxfrags;
757 if (oss_periods > s)
758 oss_periods = s;
759
760 s = snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
761 if (s < 2)
762 s = 2;
763 if (oss_periods < s)
764 oss_periods = s;
765
766 while (oss_period_size * oss_periods > oss_buffer_size)
767 oss_period_size /= 2;
768
769 if (oss_period_size < 16)
770 return -EINVAL;
771 runtime->oss.period_bytes = oss_period_size;
772 runtime->oss.period_frames = 1;
773 runtime->oss.periods = oss_periods;
774 return 0;
775 }
776
choose_rate(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,unsigned int best_rate)777 static int choose_rate(struct snd_pcm_substream *substream,
778 struct snd_pcm_hw_params *params, unsigned int best_rate)
779 {
780 const struct snd_interval *it;
781 struct snd_pcm_hw_params *save;
782 unsigned int rate, prev;
783
784 save = kmalloc(sizeof(*save), GFP_KERNEL);
785 if (save == NULL)
786 return -ENOMEM;
787 *save = *params;
788 it = hw_param_interval_c(save, SNDRV_PCM_HW_PARAM_RATE);
789
790 /* try multiples of the best rate */
791 rate = best_rate;
792 for (;;) {
793 if (it->max < rate || (it->max == rate && it->openmax))
794 break;
795 if (it->min < rate || (it->min == rate && !it->openmin)) {
796 int ret;
797 ret = snd_pcm_hw_param_set(substream, params,
798 SNDRV_PCM_HW_PARAM_RATE,
799 rate, 0);
800 if (ret == (int)rate) {
801 kfree(save);
802 return rate;
803 }
804 *params = *save;
805 }
806 prev = rate;
807 rate += best_rate;
808 if (rate <= prev)
809 break;
810 }
811
812 /* not found, use the nearest rate */
813 kfree(save);
814 return snd_pcm_hw_param_near(substream, params, SNDRV_PCM_HW_PARAM_RATE, best_rate, NULL);
815 }
816
817 /* parameter locking: returns immediately if tried during streaming */
lock_params(struct snd_pcm_runtime * runtime)818 static int lock_params(struct snd_pcm_runtime *runtime)
819 {
820 if (mutex_lock_interruptible(&runtime->oss.params_lock))
821 return -ERESTARTSYS;
822 if (atomic_read(&runtime->oss.rw_ref)) {
823 mutex_unlock(&runtime->oss.params_lock);
824 return -EBUSY;
825 }
826 return 0;
827 }
828
unlock_params(struct snd_pcm_runtime * runtime)829 static void unlock_params(struct snd_pcm_runtime *runtime)
830 {
831 mutex_unlock(&runtime->oss.params_lock);
832 }
833
834 /* call with params_lock held */
snd_pcm_oss_change_params_locked(struct snd_pcm_substream * substream)835 static int snd_pcm_oss_change_params_locked(struct snd_pcm_substream *substream)
836 {
837 struct snd_pcm_runtime *runtime = substream->runtime;
838 struct snd_pcm_hw_params *params, *sparams;
839 struct snd_pcm_sw_params *sw_params;
840 ssize_t oss_buffer_size, oss_period_size;
841 size_t oss_frame_size;
842 int err;
843 int direct;
844 snd_pcm_format_t format, sformat;
845 int n;
846 const struct snd_mask *sformat_mask;
847 struct snd_mask mask;
848
849 if (!runtime->oss.params)
850 return 0;
851 sw_params = kzalloc(sizeof(*sw_params), GFP_KERNEL);
852 params = kmalloc(sizeof(*params), GFP_KERNEL);
853 sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
854 if (!sw_params || !params || !sparams) {
855 err = -ENOMEM;
856 goto failure;
857 }
858
859 if (atomic_read(&substream->mmap_count))
860 direct = 1;
861 else
862 direct = substream->oss.setup.direct;
863
864 _snd_pcm_hw_params_any(sparams);
865 _snd_pcm_hw_param_setinteger(sparams, SNDRV_PCM_HW_PARAM_PERIODS);
866 _snd_pcm_hw_param_min(sparams, SNDRV_PCM_HW_PARAM_PERIODS, 2, 0);
867 snd_mask_none(&mask);
868 if (atomic_read(&substream->mmap_count))
869 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
870 else {
871 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED);
872 if (!direct)
873 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
874 }
875 err = snd_pcm_hw_param_mask(substream, sparams, SNDRV_PCM_HW_PARAM_ACCESS, &mask);
876 if (err < 0) {
877 pcm_dbg(substream->pcm, "No usable accesses\n");
878 err = -EINVAL;
879 goto failure;
880 }
881 choose_rate(substream, sparams, runtime->oss.rate);
882 snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_CHANNELS, runtime->oss.channels, NULL);
883
884 format = snd_pcm_oss_format_from(runtime->oss.format);
885
886 sformat_mask = hw_param_mask_c(sparams, SNDRV_PCM_HW_PARAM_FORMAT);
887 if (direct)
888 sformat = format;
889 else
890 sformat = snd_pcm_plug_slave_format(format, sformat_mask);
891
892 if ((__force int)sformat < 0 ||
893 !snd_mask_test_format(sformat_mask, sformat)) {
894 pcm_for_each_format(sformat) {
895 if (snd_mask_test_format(sformat_mask, sformat) &&
896 snd_pcm_oss_format_to(sformat) >= 0)
897 goto format_found;
898 }
899 pcm_dbg(substream->pcm, "Cannot find a format!!!\n");
900 err = -EINVAL;
901 goto failure;
902 }
903 format_found:
904 err = _snd_pcm_hw_param_set(sparams, SNDRV_PCM_HW_PARAM_FORMAT, (__force int)sformat, 0);
905 if (err < 0)
906 goto failure;
907
908 if (direct) {
909 memcpy(params, sparams, sizeof(*params));
910 } else {
911 _snd_pcm_hw_params_any(params);
912 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
913 (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED, 0);
914 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
915 (__force int)snd_pcm_oss_format_from(runtime->oss.format), 0);
916 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
917 runtime->oss.channels, 0);
918 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
919 runtime->oss.rate, 0);
920 pdprintf("client: access = %i, format = %i, channels = %i, rate = %i\n",
921 params_access(params), params_format(params),
922 params_channels(params), params_rate(params));
923 }
924 pdprintf("slave: access = %i, format = %i, channels = %i, rate = %i\n",
925 params_access(sparams), params_format(sparams),
926 params_channels(sparams), params_rate(sparams));
927
928 oss_frame_size = snd_pcm_format_physical_width(params_format(params)) *
929 params_channels(params) / 8;
930
931 err = snd_pcm_oss_period_size(substream, params, sparams);
932 if (err < 0)
933 goto failure;
934
935 n = snd_pcm_plug_slave_size(substream, runtime->oss.period_bytes / oss_frame_size);
936 err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, n, NULL);
937 if (err < 0)
938 goto failure;
939
940 err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIODS,
941 runtime->oss.periods, NULL);
942 if (err < 0)
943 goto failure;
944
945 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
946
947 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, sparams);
948 if (err < 0) {
949 pcm_dbg(substream->pcm, "HW_PARAMS failed: %i\n", err);
950 goto failure;
951 }
952
953 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
954 snd_pcm_oss_plugin_clear(substream);
955 if (!direct) {
956 /* add necessary plugins */
957 snd_pcm_oss_plugin_clear(substream);
958 err = snd_pcm_plug_format_plugins(substream, params, sparams);
959 if (err < 0) {
960 pcm_dbg(substream->pcm,
961 "snd_pcm_plug_format_plugins failed: %i\n", err);
962 snd_pcm_oss_plugin_clear(substream);
963 goto failure;
964 }
965 if (runtime->oss.plugin_first) {
966 struct snd_pcm_plugin *plugin;
967 err = snd_pcm_plugin_build_io(substream, sparams, &plugin);
968 if (err < 0) {
969 pcm_dbg(substream->pcm,
970 "snd_pcm_plugin_build_io failed: %i\n", err);
971 snd_pcm_oss_plugin_clear(substream);
972 goto failure;
973 }
974 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
975 err = snd_pcm_plugin_append(plugin);
976 } else {
977 err = snd_pcm_plugin_insert(plugin);
978 }
979 if (err < 0) {
980 snd_pcm_oss_plugin_clear(substream);
981 goto failure;
982 }
983 }
984 }
985 #endif
986
987 if (runtime->oss.trigger) {
988 sw_params->start_threshold = 1;
989 } else {
990 sw_params->start_threshold = runtime->boundary;
991 }
992 if (atomic_read(&substream->mmap_count) ||
993 substream->stream == SNDRV_PCM_STREAM_CAPTURE)
994 sw_params->stop_threshold = runtime->boundary;
995 else
996 sw_params->stop_threshold = runtime->buffer_size;
997 sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
998 sw_params->period_step = 1;
999 sw_params->avail_min = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
1000 1 : runtime->period_size;
1001 if (atomic_read(&substream->mmap_count) ||
1002 substream->oss.setup.nosilence) {
1003 sw_params->silence_threshold = 0;
1004 sw_params->silence_size = 0;
1005 } else {
1006 snd_pcm_uframes_t frames;
1007 frames = runtime->period_size + 16;
1008 if (frames > runtime->buffer_size)
1009 frames = runtime->buffer_size;
1010 sw_params->silence_threshold = frames;
1011 sw_params->silence_size = frames;
1012 }
1013
1014 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_SW_PARAMS, sw_params);
1015 if (err < 0) {
1016 pcm_dbg(substream->pcm, "SW_PARAMS failed: %i\n", err);
1017 goto failure;
1018 }
1019
1020 runtime->oss.periods = params_periods(sparams);
1021 oss_period_size = snd_pcm_plug_client_size(substream, params_period_size(sparams));
1022 if (oss_period_size < 0) {
1023 err = -EINVAL;
1024 goto failure;
1025 }
1026 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1027 if (runtime->oss.plugin_first) {
1028 err = snd_pcm_plug_alloc(substream, oss_period_size);
1029 if (err < 0)
1030 goto failure;
1031 }
1032 #endif
1033 oss_period_size *= oss_frame_size;
1034
1035 oss_buffer_size = oss_period_size * runtime->oss.periods;
1036 if (oss_buffer_size < 0) {
1037 err = -EINVAL;
1038 goto failure;
1039 }
1040
1041 runtime->oss.period_bytes = oss_period_size;
1042 runtime->oss.buffer_bytes = oss_buffer_size;
1043
1044 pdprintf("oss: period bytes = %i, buffer bytes = %i\n",
1045 runtime->oss.period_bytes,
1046 runtime->oss.buffer_bytes);
1047 pdprintf("slave: period_size = %i, buffer_size = %i\n",
1048 params_period_size(sparams),
1049 params_buffer_size(sparams));
1050
1051 runtime->oss.format = snd_pcm_oss_format_to(params_format(params));
1052 runtime->oss.channels = params_channels(params);
1053 runtime->oss.rate = params_rate(params);
1054
1055 kvfree(runtime->oss.buffer);
1056 runtime->oss.buffer = kvzalloc(runtime->oss.period_bytes, GFP_KERNEL);
1057 if (!runtime->oss.buffer) {
1058 err = -ENOMEM;
1059 goto failure;
1060 }
1061
1062 runtime->oss.params = 0;
1063 runtime->oss.prepare = 1;
1064 runtime->oss.buffer_used = 0;
1065 if (runtime->dma_area)
1066 snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes));
1067
1068 runtime->oss.period_frames = snd_pcm_alsa_frames(substream, oss_period_size);
1069
1070 err = 0;
1071 failure:
1072 kfree(sw_params);
1073 kfree(params);
1074 kfree(sparams);
1075 return err;
1076 }
1077
1078 /* this one takes the lock by itself */
snd_pcm_oss_change_params(struct snd_pcm_substream * substream,bool trylock)1079 static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
1080 bool trylock)
1081 {
1082 struct snd_pcm_runtime *runtime = substream->runtime;
1083 int err;
1084
1085 if (trylock) {
1086 if (!(mutex_trylock(&runtime->oss.params_lock)))
1087 return -EAGAIN;
1088 } else if (mutex_lock_interruptible(&runtime->oss.params_lock))
1089 return -ERESTARTSYS;
1090
1091 err = snd_pcm_oss_change_params_locked(substream);
1092 mutex_unlock(&runtime->oss.params_lock);
1093 return err;
1094 }
1095
snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file * pcm_oss_file,struct snd_pcm_substream ** r_substream)1096 static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream)
1097 {
1098 int idx, err;
1099 struct snd_pcm_substream *asubstream = NULL, *substream;
1100
1101 for (idx = 0; idx < 2; idx++) {
1102 substream = pcm_oss_file->streams[idx];
1103 if (substream == NULL)
1104 continue;
1105 if (asubstream == NULL)
1106 asubstream = substream;
1107 if (substream->runtime->oss.params) {
1108 err = snd_pcm_oss_change_params(substream, false);
1109 if (err < 0)
1110 return err;
1111 }
1112 }
1113 if (!asubstream)
1114 return -EIO;
1115 if (r_substream)
1116 *r_substream = asubstream;
1117 return 0;
1118 }
1119
1120 /* call with params_lock held */
1121 /* NOTE: this always call PREPARE unconditionally no matter whether
1122 * runtime->oss.prepare is set or not
1123 */
snd_pcm_oss_prepare(struct snd_pcm_substream * substream)1124 static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
1125 {
1126 int err;
1127 struct snd_pcm_runtime *runtime = substream->runtime;
1128
1129 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
1130 if (err < 0) {
1131 pcm_dbg(substream->pcm,
1132 "snd_pcm_oss_prepare: SNDRV_PCM_IOCTL_PREPARE failed\n");
1133 return err;
1134 }
1135 runtime->oss.prepare = 0;
1136 runtime->oss.prev_hw_ptr_period = 0;
1137 runtime->oss.period_ptr = 0;
1138 runtime->oss.buffer_used = 0;
1139
1140 return 0;
1141 }
1142
snd_pcm_oss_make_ready(struct snd_pcm_substream * substream)1143 static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream)
1144 {
1145 struct snd_pcm_runtime *runtime;
1146 int err;
1147
1148 runtime = substream->runtime;
1149 if (runtime->oss.params) {
1150 err = snd_pcm_oss_change_params(substream, false);
1151 if (err < 0)
1152 return err;
1153 }
1154 if (runtime->oss.prepare) {
1155 if (mutex_lock_interruptible(&runtime->oss.params_lock))
1156 return -ERESTARTSYS;
1157 err = snd_pcm_oss_prepare(substream);
1158 mutex_unlock(&runtime->oss.params_lock);
1159 if (err < 0)
1160 return err;
1161 }
1162 return 0;
1163 }
1164
1165 /* call with params_lock held */
snd_pcm_oss_make_ready_locked(struct snd_pcm_substream * substream)1166 static int snd_pcm_oss_make_ready_locked(struct snd_pcm_substream *substream)
1167 {
1168 struct snd_pcm_runtime *runtime;
1169 int err;
1170
1171 runtime = substream->runtime;
1172 if (runtime->oss.params) {
1173 err = snd_pcm_oss_change_params_locked(substream);
1174 if (err < 0)
1175 return err;
1176 }
1177 if (runtime->oss.prepare) {
1178 err = snd_pcm_oss_prepare(substream);
1179 if (err < 0)
1180 return err;
1181 }
1182 return 0;
1183 }
1184
snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream * substream,snd_pcm_sframes_t * delay)1185 static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay)
1186 {
1187 struct snd_pcm_runtime *runtime;
1188 snd_pcm_uframes_t frames;
1189 int err = 0;
1190
1191 while (1) {
1192 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, delay);
1193 if (err < 0)
1194 break;
1195 runtime = substream->runtime;
1196 if (*delay <= (snd_pcm_sframes_t)runtime->buffer_size)
1197 break;
1198 /* in case of overrun, skip whole periods like OSS/Linux driver does */
1199 /* until avail(delay) <= buffer_size */
1200 frames = (*delay - runtime->buffer_size) + runtime->period_size - 1;
1201 frames /= runtime->period_size;
1202 frames *= runtime->period_size;
1203 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_FORWARD, &frames);
1204 if (err < 0)
1205 break;
1206 }
1207 return err;
1208 }
1209
snd_pcm_oss_write3(struct snd_pcm_substream * substream,const char * ptr,snd_pcm_uframes_t frames,int in_kernel)1210 snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1211 {
1212 struct snd_pcm_runtime *runtime = substream->runtime;
1213 int ret;
1214 while (1) {
1215 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1216 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1217 #ifdef OSS_DEBUG
1218 pcm_dbg(substream->pcm,
1219 "pcm_oss: write: recovering from %s\n",
1220 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1221 "XRUN" : "SUSPEND");
1222 #endif
1223 ret = snd_pcm_oss_prepare(substream);
1224 if (ret < 0)
1225 break;
1226 }
1227 mutex_unlock(&runtime->oss.params_lock);
1228 ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1229 frames, in_kernel);
1230 mutex_lock(&runtime->oss.params_lock);
1231 if (ret != -EPIPE && ret != -ESTRPIPE)
1232 break;
1233 /* test, if we can't store new data, because the stream */
1234 /* has not been started */
1235 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1236 return -EAGAIN;
1237 }
1238 return ret;
1239 }
1240
snd_pcm_oss_read3(struct snd_pcm_substream * substream,char * ptr,snd_pcm_uframes_t frames,int in_kernel)1241 snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1242 {
1243 struct snd_pcm_runtime *runtime = substream->runtime;
1244 snd_pcm_sframes_t delay;
1245 int ret;
1246 while (1) {
1247 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1248 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1249 #ifdef OSS_DEBUG
1250 pcm_dbg(substream->pcm,
1251 "pcm_oss: read: recovering from %s\n",
1252 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1253 "XRUN" : "SUSPEND");
1254 #endif
1255 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1256 if (ret < 0)
1257 break;
1258 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1259 ret = snd_pcm_oss_prepare(substream);
1260 if (ret < 0)
1261 break;
1262 }
1263 ret = snd_pcm_oss_capture_position_fixup(substream, &delay);
1264 if (ret < 0)
1265 break;
1266 mutex_unlock(&runtime->oss.params_lock);
1267 ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1268 frames, in_kernel);
1269 mutex_lock(&runtime->oss.params_lock);
1270 if (ret == -EPIPE) {
1271 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1272 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1273 if (ret < 0)
1274 break;
1275 }
1276 continue;
1277 }
1278 if (ret != -ESTRPIPE)
1279 break;
1280 }
1281 return ret;
1282 }
1283
1284 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
snd_pcm_oss_writev3(struct snd_pcm_substream * substream,void ** bufs,snd_pcm_uframes_t frames)1285 snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1286 {
1287 struct snd_pcm_runtime *runtime = substream->runtime;
1288 int ret;
1289 while (1) {
1290 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1291 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1292 #ifdef OSS_DEBUG
1293 pcm_dbg(substream->pcm,
1294 "pcm_oss: writev: recovering from %s\n",
1295 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1296 "XRUN" : "SUSPEND");
1297 #endif
1298 ret = snd_pcm_oss_prepare(substream);
1299 if (ret < 0)
1300 break;
1301 }
1302 ret = snd_pcm_kernel_writev(substream, bufs, frames);
1303 if (ret != -EPIPE && ret != -ESTRPIPE)
1304 break;
1305
1306 /* test, if we can't store new data, because the stream */
1307 /* has not been started */
1308 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1309 return -EAGAIN;
1310 }
1311 return ret;
1312 }
1313
snd_pcm_oss_readv3(struct snd_pcm_substream * substream,void ** bufs,snd_pcm_uframes_t frames)1314 snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1315 {
1316 struct snd_pcm_runtime *runtime = substream->runtime;
1317 int ret;
1318 while (1) {
1319 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1320 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1321 #ifdef OSS_DEBUG
1322 pcm_dbg(substream->pcm,
1323 "pcm_oss: readv: recovering from %s\n",
1324 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1325 "XRUN" : "SUSPEND");
1326 #endif
1327 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1328 if (ret < 0)
1329 break;
1330 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1331 ret = snd_pcm_oss_prepare(substream);
1332 if (ret < 0)
1333 break;
1334 }
1335 ret = snd_pcm_kernel_readv(substream, bufs, frames);
1336 if (ret != -EPIPE && ret != -ESTRPIPE)
1337 break;
1338 }
1339 return ret;
1340 }
1341 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
1342
snd_pcm_oss_write2(struct snd_pcm_substream * substream,const char * buf,size_t bytes,int in_kernel)1343 static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel)
1344 {
1345 struct snd_pcm_runtime *runtime = substream->runtime;
1346 snd_pcm_sframes_t frames, frames1;
1347 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1348 if (runtime->oss.plugin_first) {
1349 struct snd_pcm_plugin_channel *channels;
1350 size_t oss_frame_bytes = (runtime->oss.plugin_first->src_width * runtime->oss.plugin_first->src_format.channels) / 8;
1351 if (!in_kernel) {
1352 if (copy_from_user(runtime->oss.buffer, (const char __force __user *)buf, bytes))
1353 return -EFAULT;
1354 buf = runtime->oss.buffer;
1355 }
1356 frames = bytes / oss_frame_bytes;
1357 frames1 = snd_pcm_plug_client_channels_buf(substream, (char *)buf, frames, &channels);
1358 if (frames1 < 0)
1359 return frames1;
1360 frames1 = snd_pcm_plug_write_transfer(substream, channels, frames1);
1361 if (frames1 <= 0)
1362 return frames1;
1363 bytes = frames1 * oss_frame_bytes;
1364 } else
1365 #endif
1366 {
1367 frames = bytes_to_frames(runtime, bytes);
1368 frames1 = snd_pcm_oss_write3(substream, buf, frames, in_kernel);
1369 if (frames1 <= 0)
1370 return frames1;
1371 bytes = frames_to_bytes(runtime, frames1);
1372 }
1373 return bytes;
1374 }
1375
snd_pcm_oss_write1(struct snd_pcm_substream * substream,const char __user * buf,size_t bytes)1376 static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes)
1377 {
1378 size_t xfer = 0;
1379 ssize_t tmp = 0;
1380 struct snd_pcm_runtime *runtime = substream->runtime;
1381
1382 if (atomic_read(&substream->mmap_count))
1383 return -ENXIO;
1384
1385 atomic_inc(&runtime->oss.rw_ref);
1386 while (bytes > 0) {
1387 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1388 tmp = -ERESTARTSYS;
1389 break;
1390 }
1391 tmp = snd_pcm_oss_make_ready_locked(substream);
1392 if (tmp < 0)
1393 goto err;
1394 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1395 tmp = bytes;
1396 if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
1397 tmp = runtime->oss.period_bytes - runtime->oss.buffer_used;
1398 if (tmp > 0) {
1399 if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp)) {
1400 tmp = -EFAULT;
1401 goto err;
1402 }
1403 }
1404 runtime->oss.buffer_used += tmp;
1405 buf += tmp;
1406 bytes -= tmp;
1407 xfer += tmp;
1408 if (substream->oss.setup.partialfrag ||
1409 runtime->oss.buffer_used == runtime->oss.period_bytes) {
1410 tmp = snd_pcm_oss_write2(substream, runtime->oss.buffer + runtime->oss.period_ptr,
1411 runtime->oss.buffer_used - runtime->oss.period_ptr, 1);
1412 if (tmp <= 0)
1413 goto err;
1414 runtime->oss.bytes += tmp;
1415 runtime->oss.period_ptr += tmp;
1416 runtime->oss.period_ptr %= runtime->oss.period_bytes;
1417 if (runtime->oss.period_ptr == 0 ||
1418 runtime->oss.period_ptr == runtime->oss.buffer_used)
1419 runtime->oss.buffer_used = 0;
1420 else if ((substream->f_flags & O_NONBLOCK) != 0) {
1421 tmp = -EAGAIN;
1422 goto err;
1423 }
1424 }
1425 } else {
1426 tmp = snd_pcm_oss_write2(substream,
1427 (const char __force *)buf,
1428 runtime->oss.period_bytes, 0);
1429 if (tmp <= 0)
1430 goto err;
1431 runtime->oss.bytes += tmp;
1432 buf += tmp;
1433 bytes -= tmp;
1434 xfer += tmp;
1435 if ((substream->f_flags & O_NONBLOCK) != 0 &&
1436 tmp != runtime->oss.period_bytes)
1437 tmp = -EAGAIN;
1438 }
1439 err:
1440 mutex_unlock(&runtime->oss.params_lock);
1441 if (tmp < 0)
1442 break;
1443 if (signal_pending(current)) {
1444 tmp = -ERESTARTSYS;
1445 break;
1446 }
1447 tmp = 0;
1448 }
1449 atomic_dec(&runtime->oss.rw_ref);
1450 return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1451 }
1452
snd_pcm_oss_read2(struct snd_pcm_substream * substream,char * buf,size_t bytes,int in_kernel)1453 static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel)
1454 {
1455 struct snd_pcm_runtime *runtime = substream->runtime;
1456 snd_pcm_sframes_t frames, frames1;
1457 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1458 char __user *final_dst = (char __force __user *)buf;
1459 if (runtime->oss.plugin_first) {
1460 struct snd_pcm_plugin_channel *channels;
1461 size_t oss_frame_bytes = (runtime->oss.plugin_last->dst_width * runtime->oss.plugin_last->dst_format.channels) / 8;
1462 if (!in_kernel)
1463 buf = runtime->oss.buffer;
1464 frames = bytes / oss_frame_bytes;
1465 frames1 = snd_pcm_plug_client_channels_buf(substream, buf, frames, &channels);
1466 if (frames1 < 0)
1467 return frames1;
1468 frames1 = snd_pcm_plug_read_transfer(substream, channels, frames1);
1469 if (frames1 <= 0)
1470 return frames1;
1471 bytes = frames1 * oss_frame_bytes;
1472 if (!in_kernel && copy_to_user(final_dst, buf, bytes))
1473 return -EFAULT;
1474 } else
1475 #endif
1476 {
1477 frames = bytes_to_frames(runtime, bytes);
1478 frames1 = snd_pcm_oss_read3(substream, buf, frames, in_kernel);
1479 if (frames1 <= 0)
1480 return frames1;
1481 bytes = frames_to_bytes(runtime, frames1);
1482 }
1483 return bytes;
1484 }
1485
snd_pcm_oss_read1(struct snd_pcm_substream * substream,char __user * buf,size_t bytes)1486 static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes)
1487 {
1488 size_t xfer = 0;
1489 ssize_t tmp = 0;
1490 struct snd_pcm_runtime *runtime = substream->runtime;
1491
1492 if (atomic_read(&substream->mmap_count))
1493 return -ENXIO;
1494
1495 atomic_inc(&runtime->oss.rw_ref);
1496 while (bytes > 0) {
1497 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1498 tmp = -ERESTARTSYS;
1499 break;
1500 }
1501 tmp = snd_pcm_oss_make_ready_locked(substream);
1502 if (tmp < 0)
1503 goto err;
1504 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1505 if (runtime->oss.buffer_used == 0) {
1506 tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1);
1507 if (tmp <= 0)
1508 goto err;
1509 runtime->oss.bytes += tmp;
1510 runtime->oss.period_ptr = tmp;
1511 runtime->oss.buffer_used = tmp;
1512 }
1513 tmp = bytes;
1514 if ((size_t) tmp > runtime->oss.buffer_used)
1515 tmp = runtime->oss.buffer_used;
1516 if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp)) {
1517 tmp = -EFAULT;
1518 goto err;
1519 }
1520 buf += tmp;
1521 bytes -= tmp;
1522 xfer += tmp;
1523 runtime->oss.buffer_used -= tmp;
1524 } else {
1525 tmp = snd_pcm_oss_read2(substream, (char __force *)buf,
1526 runtime->oss.period_bytes, 0);
1527 if (tmp <= 0)
1528 goto err;
1529 runtime->oss.bytes += tmp;
1530 buf += tmp;
1531 bytes -= tmp;
1532 xfer += tmp;
1533 }
1534 err:
1535 mutex_unlock(&runtime->oss.params_lock);
1536 if (tmp < 0)
1537 break;
1538 if (signal_pending(current)) {
1539 tmp = -ERESTARTSYS;
1540 break;
1541 }
1542 tmp = 0;
1543 }
1544 atomic_dec(&runtime->oss.rw_ref);
1545 return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1546 }
1547
snd_pcm_oss_reset(struct snd_pcm_oss_file * pcm_oss_file)1548 static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
1549 {
1550 struct snd_pcm_substream *substream;
1551 struct snd_pcm_runtime *runtime;
1552 int i;
1553
1554 for (i = 0; i < 2; i++) {
1555 substream = pcm_oss_file->streams[i];
1556 if (!substream)
1557 continue;
1558 runtime = substream->runtime;
1559 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1560 mutex_lock(&runtime->oss.params_lock);
1561 runtime->oss.prepare = 1;
1562 runtime->oss.buffer_used = 0;
1563 runtime->oss.prev_hw_ptr_period = 0;
1564 runtime->oss.period_ptr = 0;
1565 mutex_unlock(&runtime->oss.params_lock);
1566 }
1567 return 0;
1568 }
1569
snd_pcm_oss_post(struct snd_pcm_oss_file * pcm_oss_file)1570 static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file)
1571 {
1572 struct snd_pcm_substream *substream;
1573 int err;
1574
1575 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1576 if (substream != NULL) {
1577 err = snd_pcm_oss_make_ready(substream);
1578 if (err < 0)
1579 return err;
1580 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL);
1581 }
1582 /* note: all errors from the start action are ignored */
1583 /* OSS apps do not know, how to handle them */
1584 return 0;
1585 }
1586
snd_pcm_oss_sync1(struct snd_pcm_substream * substream,size_t size)1587 static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size)
1588 {
1589 struct snd_pcm_runtime *runtime;
1590 ssize_t result = 0;
1591 snd_pcm_state_t state;
1592 long res;
1593 wait_queue_entry_t wait;
1594
1595 runtime = substream->runtime;
1596 init_waitqueue_entry(&wait, current);
1597 add_wait_queue(&runtime->sleep, &wait);
1598 #ifdef OSS_DEBUG
1599 pcm_dbg(substream->pcm, "sync1: size = %li\n", size);
1600 #endif
1601 while (1) {
1602 result = snd_pcm_oss_write2(substream, runtime->oss.buffer, size, 1);
1603 if (result > 0) {
1604 runtime->oss.buffer_used = 0;
1605 result = 0;
1606 break;
1607 }
1608 if (result != 0 && result != -EAGAIN)
1609 break;
1610 result = 0;
1611 set_current_state(TASK_INTERRUPTIBLE);
1612 snd_pcm_stream_lock_irq(substream);
1613 state = runtime->status->state;
1614 snd_pcm_stream_unlock_irq(substream);
1615 if (state != SNDRV_PCM_STATE_RUNNING) {
1616 set_current_state(TASK_RUNNING);
1617 break;
1618 }
1619 res = schedule_timeout(10 * HZ);
1620 if (signal_pending(current)) {
1621 result = -ERESTARTSYS;
1622 break;
1623 }
1624 if (res == 0) {
1625 pcm_err(substream->pcm,
1626 "OSS sync error - DMA timeout\n");
1627 result = -EIO;
1628 break;
1629 }
1630 }
1631 remove_wait_queue(&runtime->sleep, &wait);
1632 return result;
1633 }
1634
snd_pcm_oss_sync(struct snd_pcm_oss_file * pcm_oss_file)1635 static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
1636 {
1637 int err = 0;
1638 unsigned int saved_f_flags;
1639 struct snd_pcm_substream *substream;
1640 struct snd_pcm_runtime *runtime;
1641 snd_pcm_format_t format;
1642 unsigned long width;
1643 size_t size;
1644
1645 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1646 if (substream != NULL) {
1647 runtime = substream->runtime;
1648 if (atomic_read(&substream->mmap_count))
1649 goto __direct;
1650 err = snd_pcm_oss_make_ready(substream);
1651 if (err < 0)
1652 return err;
1653 atomic_inc(&runtime->oss.rw_ref);
1654 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1655 atomic_dec(&runtime->oss.rw_ref);
1656 return -ERESTARTSYS;
1657 }
1658 format = snd_pcm_oss_format_from(runtime->oss.format);
1659 width = snd_pcm_format_physical_width(format);
1660 if (runtime->oss.buffer_used > 0) {
1661 #ifdef OSS_DEBUG
1662 pcm_dbg(substream->pcm, "sync: buffer_used\n");
1663 #endif
1664 size = (8 * (runtime->oss.period_bytes - runtime->oss.buffer_used) + 7) / width;
1665 snd_pcm_format_set_silence(format,
1666 runtime->oss.buffer + runtime->oss.buffer_used,
1667 size);
1668 err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes);
1669 if (err < 0)
1670 goto unlock;
1671 } else if (runtime->oss.period_ptr > 0) {
1672 #ifdef OSS_DEBUG
1673 pcm_dbg(substream->pcm, "sync: period_ptr\n");
1674 #endif
1675 size = runtime->oss.period_bytes - runtime->oss.period_ptr;
1676 snd_pcm_format_set_silence(format,
1677 runtime->oss.buffer,
1678 size * 8 / width);
1679 err = snd_pcm_oss_sync1(substream, size);
1680 if (err < 0)
1681 goto unlock;
1682 }
1683 /*
1684 * The ALSA's period might be a bit large than OSS one.
1685 * Fill the remain portion of ALSA period with zeros.
1686 */
1687 size = runtime->control->appl_ptr % runtime->period_size;
1688 if (size > 0) {
1689 size = runtime->period_size - size;
1690 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED)
1691 snd_pcm_lib_write(substream, NULL, size);
1692 else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1693 snd_pcm_lib_writev(substream, NULL, size);
1694 }
1695 unlock:
1696 mutex_unlock(&runtime->oss.params_lock);
1697 atomic_dec(&runtime->oss.rw_ref);
1698 if (err < 0)
1699 return err;
1700 /*
1701 * finish sync: drain the buffer
1702 */
1703 __direct:
1704 saved_f_flags = substream->f_flags;
1705 substream->f_flags &= ~O_NONBLOCK;
1706 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1707 substream->f_flags = saved_f_flags;
1708 if (err < 0)
1709 return err;
1710 mutex_lock(&runtime->oss.params_lock);
1711 runtime->oss.prepare = 1;
1712 mutex_unlock(&runtime->oss.params_lock);
1713 }
1714
1715 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
1716 if (substream != NULL) {
1717 err = snd_pcm_oss_make_ready(substream);
1718 if (err < 0)
1719 return err;
1720 runtime = substream->runtime;
1721 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1722 if (err < 0)
1723 return err;
1724 mutex_lock(&runtime->oss.params_lock);
1725 runtime->oss.buffer_used = 0;
1726 runtime->oss.prepare = 1;
1727 mutex_unlock(&runtime->oss.params_lock);
1728 }
1729 return 0;
1730 }
1731
snd_pcm_oss_set_rate(struct snd_pcm_oss_file * pcm_oss_file,int rate)1732 static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)
1733 {
1734 int idx;
1735
1736 for (idx = 1; idx >= 0; --idx) {
1737 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1738 struct snd_pcm_runtime *runtime;
1739 int err;
1740
1741 if (substream == NULL)
1742 continue;
1743 runtime = substream->runtime;
1744 if (rate < 1000)
1745 rate = 1000;
1746 else if (rate > 192000)
1747 rate = 192000;
1748 err = lock_params(runtime);
1749 if (err < 0)
1750 return err;
1751 if (runtime->oss.rate != rate) {
1752 runtime->oss.params = 1;
1753 runtime->oss.rate = rate;
1754 }
1755 unlock_params(runtime);
1756 }
1757 return snd_pcm_oss_get_rate(pcm_oss_file);
1758 }
1759
snd_pcm_oss_get_rate(struct snd_pcm_oss_file * pcm_oss_file)1760 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file)
1761 {
1762 struct snd_pcm_substream *substream;
1763 int err;
1764
1765 err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1766 if (err < 0)
1767 return err;
1768 return substream->runtime->oss.rate;
1769 }
1770
snd_pcm_oss_set_channels(struct snd_pcm_oss_file * pcm_oss_file,unsigned int channels)1771 static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels)
1772 {
1773 int idx;
1774 if (channels < 1)
1775 channels = 1;
1776 if (channels > 128)
1777 return -EINVAL;
1778 for (idx = 1; idx >= 0; --idx) {
1779 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1780 struct snd_pcm_runtime *runtime;
1781 int err;
1782
1783 if (substream == NULL)
1784 continue;
1785 runtime = substream->runtime;
1786 err = lock_params(runtime);
1787 if (err < 0)
1788 return err;
1789 if (runtime->oss.channels != channels) {
1790 runtime->oss.params = 1;
1791 runtime->oss.channels = channels;
1792 }
1793 unlock_params(runtime);
1794 }
1795 return snd_pcm_oss_get_channels(pcm_oss_file);
1796 }
1797
snd_pcm_oss_get_channels(struct snd_pcm_oss_file * pcm_oss_file)1798 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file)
1799 {
1800 struct snd_pcm_substream *substream;
1801 int err;
1802
1803 err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1804 if (err < 0)
1805 return err;
1806 return substream->runtime->oss.channels;
1807 }
1808
snd_pcm_oss_get_block_size(struct snd_pcm_oss_file * pcm_oss_file)1809 static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file)
1810 {
1811 struct snd_pcm_substream *substream;
1812 int err;
1813
1814 err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1815 if (err < 0)
1816 return err;
1817 return substream->runtime->oss.period_bytes;
1818 }
1819
snd_pcm_oss_get_formats(struct snd_pcm_oss_file * pcm_oss_file)1820 static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file)
1821 {
1822 struct snd_pcm_substream *substream;
1823 int err;
1824 int direct;
1825 struct snd_pcm_hw_params *params;
1826 unsigned int formats = 0;
1827 const struct snd_mask *format_mask;
1828 int fmt;
1829
1830 err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1831 if (err < 0)
1832 return err;
1833 if (atomic_read(&substream->mmap_count))
1834 direct = 1;
1835 else
1836 direct = substream->oss.setup.direct;
1837 if (!direct)
1838 return AFMT_MU_LAW | AFMT_U8 |
1839 AFMT_S16_LE | AFMT_S16_BE |
1840 AFMT_S8 | AFMT_U16_LE |
1841 AFMT_U16_BE |
1842 AFMT_S32_LE | AFMT_S32_BE |
1843 AFMT_S24_LE | AFMT_S24_BE |
1844 AFMT_S24_PACKED;
1845 params = kmalloc(sizeof(*params), GFP_KERNEL);
1846 if (!params)
1847 return -ENOMEM;
1848 _snd_pcm_hw_params_any(params);
1849 err = snd_pcm_hw_refine(substream, params);
1850 if (err < 0)
1851 goto error;
1852 format_mask = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
1853 for (fmt = 0; fmt < 32; ++fmt) {
1854 if (snd_mask_test(format_mask, fmt)) {
1855 int f = snd_pcm_oss_format_to((__force snd_pcm_format_t)fmt);
1856 if (f >= 0)
1857 formats |= f;
1858 }
1859 }
1860
1861 error:
1862 kfree(params);
1863 return err < 0 ? err : formats;
1864 }
1865
snd_pcm_oss_set_format(struct snd_pcm_oss_file * pcm_oss_file,int format)1866 static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format)
1867 {
1868 int formats, idx;
1869 int err;
1870
1871 if (format != AFMT_QUERY) {
1872 formats = snd_pcm_oss_get_formats(pcm_oss_file);
1873 if (formats < 0)
1874 return formats;
1875 if (!(formats & format))
1876 format = AFMT_U8;
1877 for (idx = 1; idx >= 0; --idx) {
1878 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1879 struct snd_pcm_runtime *runtime;
1880 if (substream == NULL)
1881 continue;
1882 runtime = substream->runtime;
1883 err = lock_params(runtime);
1884 if (err < 0)
1885 return err;
1886 if (runtime->oss.format != format) {
1887 runtime->oss.params = 1;
1888 runtime->oss.format = format;
1889 }
1890 unlock_params(runtime);
1891 }
1892 }
1893 return snd_pcm_oss_get_format(pcm_oss_file);
1894 }
1895
snd_pcm_oss_get_format(struct snd_pcm_oss_file * pcm_oss_file)1896 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file)
1897 {
1898 struct snd_pcm_substream *substream;
1899 int err;
1900
1901 err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1902 if (err < 0)
1903 return err;
1904 return substream->runtime->oss.format;
1905 }
1906
snd_pcm_oss_set_subdivide1(struct snd_pcm_substream * substream,int subdivide)1907 static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide)
1908 {
1909 struct snd_pcm_runtime *runtime;
1910
1911 runtime = substream->runtime;
1912 if (subdivide == 0) {
1913 subdivide = runtime->oss.subdivision;
1914 if (subdivide == 0)
1915 subdivide = 1;
1916 return subdivide;
1917 }
1918 if (runtime->oss.subdivision || runtime->oss.fragshift)
1919 return -EINVAL;
1920 if (subdivide != 1 && subdivide != 2 && subdivide != 4 &&
1921 subdivide != 8 && subdivide != 16)
1922 return -EINVAL;
1923 runtime->oss.subdivision = subdivide;
1924 runtime->oss.params = 1;
1925 return subdivide;
1926 }
1927
snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file * pcm_oss_file,int subdivide)1928 static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide)
1929 {
1930 int err = -EINVAL, idx;
1931
1932 for (idx = 1; idx >= 0; --idx) {
1933 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1934 struct snd_pcm_runtime *runtime;
1935
1936 if (substream == NULL)
1937 continue;
1938 runtime = substream->runtime;
1939 err = lock_params(runtime);
1940 if (err < 0)
1941 return err;
1942 err = snd_pcm_oss_set_subdivide1(substream, subdivide);
1943 unlock_params(runtime);
1944 if (err < 0)
1945 return err;
1946 }
1947 return err;
1948 }
1949
snd_pcm_oss_set_fragment1(struct snd_pcm_substream * substream,unsigned int val)1950 static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val)
1951 {
1952 struct snd_pcm_runtime *runtime;
1953 int fragshift;
1954
1955 runtime = substream->runtime;
1956 if (runtime->oss.subdivision || runtime->oss.fragshift)
1957 return -EINVAL;
1958 fragshift = val & 0xffff;
1959 if (fragshift >= 31)
1960 return -EINVAL;
1961 runtime->oss.fragshift = fragshift;
1962 runtime->oss.maxfrags = (val >> 16) & 0xffff;
1963 if (runtime->oss.fragshift < 4) /* < 16 */
1964 runtime->oss.fragshift = 4;
1965 if (runtime->oss.maxfrags < 2)
1966 runtime->oss.maxfrags = 2;
1967 runtime->oss.params = 1;
1968 return 0;
1969 }
1970
snd_pcm_oss_set_fragment(struct snd_pcm_oss_file * pcm_oss_file,unsigned int val)1971 static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val)
1972 {
1973 int err = -EINVAL, idx;
1974
1975 for (idx = 1; idx >= 0; --idx) {
1976 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1977 struct snd_pcm_runtime *runtime;
1978
1979 if (substream == NULL)
1980 continue;
1981 runtime = substream->runtime;
1982 err = lock_params(runtime);
1983 if (err < 0)
1984 return err;
1985 err = snd_pcm_oss_set_fragment1(substream, val);
1986 unlock_params(runtime);
1987 if (err < 0)
1988 return err;
1989 }
1990 return err;
1991 }
1992
snd_pcm_oss_nonblock(struct file * file)1993 static int snd_pcm_oss_nonblock(struct file * file)
1994 {
1995 spin_lock(&file->f_lock);
1996 file->f_flags |= O_NONBLOCK;
1997 spin_unlock(&file->f_lock);
1998 return 0;
1999 }
2000
snd_pcm_oss_get_caps1(struct snd_pcm_substream * substream,int res)2001 static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res)
2002 {
2003
2004 if (substream == NULL) {
2005 res &= ~DSP_CAP_DUPLEX;
2006 return res;
2007 }
2008 #ifdef DSP_CAP_MULTI
2009 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2010 if (substream->pstr->substream_count > 1)
2011 res |= DSP_CAP_MULTI;
2012 #endif
2013 /* DSP_CAP_REALTIME is set all times: */
2014 /* all ALSA drivers can return actual pointer in ring buffer */
2015 #if defined(DSP_CAP_REALTIME) && 0
2016 {
2017 struct snd_pcm_runtime *runtime = substream->runtime;
2018 if (runtime->info & (SNDRV_PCM_INFO_BLOCK_TRANSFER|SNDRV_PCM_INFO_BATCH))
2019 res &= ~DSP_CAP_REALTIME;
2020 }
2021 #endif
2022 return res;
2023 }
2024
snd_pcm_oss_get_caps(struct snd_pcm_oss_file * pcm_oss_file)2025 static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)
2026 {
2027 int result, idx;
2028
2029 result = DSP_CAP_TRIGGER | DSP_CAP_MMAP | DSP_CAP_DUPLEX | DSP_CAP_REALTIME;
2030 for (idx = 0; idx < 2; idx++) {
2031 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
2032 result = snd_pcm_oss_get_caps1(substream, result);
2033 }
2034 result |= 0x0001; /* revision - same as SB AWE 64 */
2035 return result;
2036 }
2037
snd_pcm_oss_simulate_fill(struct snd_pcm_substream * substream,snd_pcm_uframes_t hw_ptr)2038 static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
2039 snd_pcm_uframes_t hw_ptr)
2040 {
2041 struct snd_pcm_runtime *runtime = substream->runtime;
2042 snd_pcm_uframes_t appl_ptr;
2043 appl_ptr = hw_ptr + runtime->buffer_size;
2044 appl_ptr %= runtime->boundary;
2045 runtime->control->appl_ptr = appl_ptr;
2046 }
2047
snd_pcm_oss_set_trigger(struct snd_pcm_oss_file * pcm_oss_file,int trigger)2048 static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger)
2049 {
2050 struct snd_pcm_runtime *runtime;
2051 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2052 int err, cmd;
2053
2054 #ifdef OSS_DEBUG
2055 pcm_dbg(substream->pcm, "pcm_oss: trigger = 0x%x\n", trigger);
2056 #endif
2057
2058 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2059 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2060
2061 if (psubstream) {
2062 err = snd_pcm_oss_make_ready(psubstream);
2063 if (err < 0)
2064 return err;
2065 }
2066 if (csubstream) {
2067 err = snd_pcm_oss_make_ready(csubstream);
2068 if (err < 0)
2069 return err;
2070 }
2071 if (psubstream) {
2072 runtime = psubstream->runtime;
2073 cmd = 0;
2074 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2075 return -ERESTARTSYS;
2076 if (trigger & PCM_ENABLE_OUTPUT) {
2077 if (runtime->oss.trigger)
2078 goto _skip1;
2079 if (atomic_read(&psubstream->mmap_count))
2080 snd_pcm_oss_simulate_fill(psubstream,
2081 get_hw_ptr_period(runtime));
2082 runtime->oss.trigger = 1;
2083 runtime->start_threshold = 1;
2084 cmd = SNDRV_PCM_IOCTL_START;
2085 } else {
2086 if (!runtime->oss.trigger)
2087 goto _skip1;
2088 runtime->oss.trigger = 0;
2089 runtime->start_threshold = runtime->boundary;
2090 cmd = SNDRV_PCM_IOCTL_DROP;
2091 runtime->oss.prepare = 1;
2092 }
2093 _skip1:
2094 mutex_unlock(&runtime->oss.params_lock);
2095 if (cmd) {
2096 err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL);
2097 if (err < 0)
2098 return err;
2099 }
2100 }
2101 if (csubstream) {
2102 runtime = csubstream->runtime;
2103 cmd = 0;
2104 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2105 return -ERESTARTSYS;
2106 if (trigger & PCM_ENABLE_INPUT) {
2107 if (runtime->oss.trigger)
2108 goto _skip2;
2109 runtime->oss.trigger = 1;
2110 runtime->start_threshold = 1;
2111 cmd = SNDRV_PCM_IOCTL_START;
2112 } else {
2113 if (!runtime->oss.trigger)
2114 goto _skip2;
2115 runtime->oss.trigger = 0;
2116 runtime->start_threshold = runtime->boundary;
2117 cmd = SNDRV_PCM_IOCTL_DROP;
2118 runtime->oss.prepare = 1;
2119 }
2120 _skip2:
2121 mutex_unlock(&runtime->oss.params_lock);
2122 if (cmd) {
2123 err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL);
2124 if (err < 0)
2125 return err;
2126 }
2127 }
2128 return 0;
2129 }
2130
snd_pcm_oss_get_trigger(struct snd_pcm_oss_file * pcm_oss_file)2131 static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file)
2132 {
2133 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2134 int result = 0;
2135
2136 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2137 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2138 if (psubstream && psubstream->runtime && psubstream->runtime->oss.trigger)
2139 result |= PCM_ENABLE_OUTPUT;
2140 if (csubstream && csubstream->runtime && csubstream->runtime->oss.trigger)
2141 result |= PCM_ENABLE_INPUT;
2142 return result;
2143 }
2144
snd_pcm_oss_get_odelay(struct snd_pcm_oss_file * pcm_oss_file)2145 static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file)
2146 {
2147 struct snd_pcm_substream *substream;
2148 struct snd_pcm_runtime *runtime;
2149 snd_pcm_sframes_t delay;
2150 int err;
2151
2152 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2153 if (substream == NULL)
2154 return -EINVAL;
2155 err = snd_pcm_oss_make_ready(substream);
2156 if (err < 0)
2157 return err;
2158 runtime = substream->runtime;
2159 if (runtime->oss.params || runtime->oss.prepare)
2160 return 0;
2161 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2162 if (err == -EPIPE)
2163 delay = 0; /* hack for broken OSS applications */
2164 else if (err < 0)
2165 return err;
2166 return snd_pcm_oss_bytes(substream, delay);
2167 }
2168
snd_pcm_oss_get_ptr(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct count_info __user * _info)2169 static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info)
2170 {
2171 struct snd_pcm_substream *substream;
2172 struct snd_pcm_runtime *runtime;
2173 snd_pcm_sframes_t delay;
2174 int fixup;
2175 struct count_info info;
2176 int err;
2177
2178 if (_info == NULL)
2179 return -EFAULT;
2180 substream = pcm_oss_file->streams[stream];
2181 if (substream == NULL)
2182 return -EINVAL;
2183 err = snd_pcm_oss_make_ready(substream);
2184 if (err < 0)
2185 return err;
2186 runtime = substream->runtime;
2187 if (runtime->oss.params || runtime->oss.prepare) {
2188 memset(&info, 0, sizeof(info));
2189 if (copy_to_user(_info, &info, sizeof(info)))
2190 return -EFAULT;
2191 return 0;
2192 }
2193 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2194 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2195 if (err == -EPIPE || err == -ESTRPIPE || (! err && delay < 0)) {
2196 err = 0;
2197 delay = 0;
2198 fixup = 0;
2199 } else {
2200 fixup = runtime->oss.buffer_used;
2201 }
2202 } else {
2203 err = snd_pcm_oss_capture_position_fixup(substream, &delay);
2204 fixup = -runtime->oss.buffer_used;
2205 }
2206 if (err < 0)
2207 return err;
2208 info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size);
2209 if (atomic_read(&substream->mmap_count)) {
2210 snd_pcm_sframes_t n;
2211 delay = get_hw_ptr_period(runtime);
2212 n = delay - runtime->oss.prev_hw_ptr_period;
2213 if (n < 0)
2214 n += runtime->boundary;
2215 info.blocks = n / runtime->period_size;
2216 runtime->oss.prev_hw_ptr_period = delay;
2217 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2218 snd_pcm_oss_simulate_fill(substream, delay);
2219 info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
2220 } else {
2221 delay = snd_pcm_oss_bytes(substream, delay);
2222 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2223 if (substream->oss.setup.buggyptr)
2224 info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
2225 else
2226 info.blocks = (delay + fixup) / runtime->oss.period_bytes;
2227 info.bytes = (runtime->oss.bytes - delay) & INT_MAX;
2228 } else {
2229 delay += fixup;
2230 info.blocks = delay / runtime->oss.period_bytes;
2231 info.bytes = (runtime->oss.bytes + delay) & INT_MAX;
2232 }
2233 }
2234 if (copy_to_user(_info, &info, sizeof(info)))
2235 return -EFAULT;
2236 return 0;
2237 }
2238
snd_pcm_oss_get_space(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct audio_buf_info __user * _info)2239 static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info)
2240 {
2241 struct snd_pcm_substream *substream;
2242 struct snd_pcm_runtime *runtime;
2243 snd_pcm_sframes_t avail;
2244 int fixup;
2245 struct audio_buf_info info;
2246 int err;
2247
2248 if (_info == NULL)
2249 return -EFAULT;
2250 substream = pcm_oss_file->streams[stream];
2251 if (substream == NULL)
2252 return -EINVAL;
2253 runtime = substream->runtime;
2254
2255 if (runtime->oss.params) {
2256 err = snd_pcm_oss_change_params(substream, false);
2257 if (err < 0)
2258 return err;
2259 }
2260
2261 info.fragsize = runtime->oss.period_bytes;
2262 info.fragstotal = runtime->periods;
2263 if (runtime->oss.prepare) {
2264 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2265 info.bytes = runtime->oss.period_bytes * runtime->oss.periods;
2266 info.fragments = runtime->oss.periods;
2267 } else {
2268 info.bytes = 0;
2269 info.fragments = 0;
2270 }
2271 } else {
2272 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2273 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &avail);
2274 if (err == -EPIPE || err == -ESTRPIPE || (! err && avail < 0)) {
2275 avail = runtime->buffer_size;
2276 err = 0;
2277 fixup = 0;
2278 } else {
2279 avail = runtime->buffer_size - avail;
2280 fixup = -runtime->oss.buffer_used;
2281 }
2282 } else {
2283 err = snd_pcm_oss_capture_position_fixup(substream, &avail);
2284 fixup = runtime->oss.buffer_used;
2285 }
2286 if (err < 0)
2287 return err;
2288 info.bytes = snd_pcm_oss_bytes(substream, avail) + fixup;
2289 info.fragments = info.bytes / runtime->oss.period_bytes;
2290 }
2291
2292 #ifdef OSS_DEBUG
2293 pcm_dbg(substream->pcm,
2294 "pcm_oss: space: bytes = %i, fragments = %i, fragstotal = %i, fragsize = %i\n",
2295 info.bytes, info.fragments, info.fragstotal, info.fragsize);
2296 #endif
2297 if (copy_to_user(_info, &info, sizeof(info)))
2298 return -EFAULT;
2299 return 0;
2300 }
2301
snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct buffmem_desc __user * _info)2302 static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info)
2303 {
2304 // it won't be probably implemented
2305 // pr_debug("TODO: snd_pcm_oss_get_mapbuf\n");
2306 return -EINVAL;
2307 }
2308
strip_task_path(const char * path)2309 static const char *strip_task_path(const char *path)
2310 {
2311 const char *ptr, *ptrl = NULL;
2312 for (ptr = path; *ptr; ptr++) {
2313 if (*ptr == '/')
2314 ptrl = ptr + 1;
2315 }
2316 return ptrl;
2317 }
2318
snd_pcm_oss_look_for_setup(struct snd_pcm * pcm,int stream,const char * task_name,struct snd_pcm_oss_setup * rsetup)2319 static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
2320 const char *task_name,
2321 struct snd_pcm_oss_setup *rsetup)
2322 {
2323 struct snd_pcm_oss_setup *setup;
2324
2325 mutex_lock(&pcm->streams[stream].oss.setup_mutex);
2326 do {
2327 for (setup = pcm->streams[stream].oss.setup_list; setup;
2328 setup = setup->next) {
2329 if (!strcmp(setup->task_name, task_name))
2330 goto out;
2331 }
2332 } while ((task_name = strip_task_path(task_name)) != NULL);
2333 out:
2334 if (setup)
2335 *rsetup = *setup;
2336 mutex_unlock(&pcm->streams[stream].oss.setup_mutex);
2337 }
2338
snd_pcm_oss_release_substream(struct snd_pcm_substream * substream)2339 static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream)
2340 {
2341 struct snd_pcm_runtime *runtime;
2342 runtime = substream->runtime;
2343 kvfree(runtime->oss.buffer);
2344 runtime->oss.buffer = NULL;
2345 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2346 snd_pcm_oss_plugin_clear(substream);
2347 #endif
2348 substream->oss.oss = 0;
2349 }
2350
snd_pcm_oss_init_substream(struct snd_pcm_substream * substream,struct snd_pcm_oss_setup * setup,int minor)2351 static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
2352 struct snd_pcm_oss_setup *setup,
2353 int minor)
2354 {
2355 struct snd_pcm_runtime *runtime;
2356
2357 substream->oss.oss = 1;
2358 substream->oss.setup = *setup;
2359 if (setup->nonblock)
2360 substream->f_flags |= O_NONBLOCK;
2361 else if (setup->block)
2362 substream->f_flags &= ~O_NONBLOCK;
2363 runtime = substream->runtime;
2364 runtime->oss.params = 1;
2365 runtime->oss.trigger = 1;
2366 runtime->oss.rate = 8000;
2367 mutex_init(&runtime->oss.params_lock);
2368 switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
2369 case SNDRV_MINOR_OSS_PCM_8:
2370 runtime->oss.format = AFMT_U8;
2371 break;
2372 case SNDRV_MINOR_OSS_PCM_16:
2373 runtime->oss.format = AFMT_S16_LE;
2374 break;
2375 default:
2376 runtime->oss.format = AFMT_MU_LAW;
2377 }
2378 runtime->oss.channels = 1;
2379 runtime->oss.fragshift = 0;
2380 runtime->oss.maxfrags = 0;
2381 runtime->oss.subdivision = 0;
2382 substream->pcm_release = snd_pcm_oss_release_substream;
2383 atomic_set(&runtime->oss.rw_ref, 0);
2384 }
2385
snd_pcm_oss_release_file(struct snd_pcm_oss_file * pcm_oss_file)2386 static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file)
2387 {
2388 int cidx;
2389 if (!pcm_oss_file)
2390 return 0;
2391 for (cidx = 0; cidx < 2; ++cidx) {
2392 struct snd_pcm_substream *substream = pcm_oss_file->streams[cidx];
2393 if (substream)
2394 snd_pcm_release_substream(substream);
2395 }
2396 kfree(pcm_oss_file);
2397 return 0;
2398 }
2399
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)2400 static int snd_pcm_oss_open_file(struct file *file,
2401 struct snd_pcm *pcm,
2402 struct snd_pcm_oss_file **rpcm_oss_file,
2403 int minor,
2404 struct snd_pcm_oss_setup *setup)
2405 {
2406 int idx, err;
2407 struct snd_pcm_oss_file *pcm_oss_file;
2408 struct snd_pcm_substream *substream;
2409 fmode_t f_mode = file->f_mode;
2410
2411 if (rpcm_oss_file)
2412 *rpcm_oss_file = NULL;
2413
2414 pcm_oss_file = kzalloc(sizeof(*pcm_oss_file), GFP_KERNEL);
2415 if (pcm_oss_file == NULL)
2416 return -ENOMEM;
2417
2418 if ((f_mode & (FMODE_WRITE|FMODE_READ)) == (FMODE_WRITE|FMODE_READ) &&
2419 (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX))
2420 f_mode = FMODE_WRITE;
2421
2422 file->f_flags &= ~O_APPEND;
2423 for (idx = 0; idx < 2; idx++) {
2424 if (setup[idx].disable)
2425 continue;
2426 if (! pcm->streams[idx].substream_count)
2427 continue; /* no matching substream */
2428 if (idx == SNDRV_PCM_STREAM_PLAYBACK) {
2429 if (! (f_mode & FMODE_WRITE))
2430 continue;
2431 } else {
2432 if (! (f_mode & FMODE_READ))
2433 continue;
2434 }
2435 err = snd_pcm_open_substream(pcm, idx, file, &substream);
2436 if (err < 0) {
2437 snd_pcm_oss_release_file(pcm_oss_file);
2438 return err;
2439 }
2440
2441 pcm_oss_file->streams[idx] = substream;
2442 snd_pcm_oss_init_substream(substream, &setup[idx], minor);
2443 }
2444
2445 if (!pcm_oss_file->streams[0] && !pcm_oss_file->streams[1]) {
2446 snd_pcm_oss_release_file(pcm_oss_file);
2447 return -EINVAL;
2448 }
2449
2450 file->private_data = pcm_oss_file;
2451 if (rpcm_oss_file)
2452 *rpcm_oss_file = pcm_oss_file;
2453 return 0;
2454 }
2455
2456
snd_task_name(struct task_struct * task,char * name,size_t size)2457 static int snd_task_name(struct task_struct *task, char *name, size_t size)
2458 {
2459 unsigned int idx;
2460
2461 if (snd_BUG_ON(!task || !name || size < 2))
2462 return -EINVAL;
2463 for (idx = 0; idx < sizeof(task->comm) && idx + 1 < size; idx++)
2464 name[idx] = task->comm[idx];
2465 name[idx] = '\0';
2466 return 0;
2467 }
2468
snd_pcm_oss_open(struct inode * inode,struct file * file)2469 static int snd_pcm_oss_open(struct inode *inode, struct file *file)
2470 {
2471 int err;
2472 char task_name[32];
2473 struct snd_pcm *pcm;
2474 struct snd_pcm_oss_file *pcm_oss_file;
2475 struct snd_pcm_oss_setup setup[2];
2476 int nonblock;
2477 wait_queue_entry_t wait;
2478
2479 err = nonseekable_open(inode, file);
2480 if (err < 0)
2481 return err;
2482
2483 pcm = snd_lookup_oss_minor_data(iminor(inode),
2484 SNDRV_OSS_DEVICE_TYPE_PCM);
2485 if (pcm == NULL) {
2486 err = -ENODEV;
2487 goto __error1;
2488 }
2489 err = snd_card_file_add(pcm->card, file);
2490 if (err < 0)
2491 goto __error1;
2492 if (!try_module_get(pcm->card->module)) {
2493 err = -EFAULT;
2494 goto __error2;
2495 }
2496 if (snd_task_name(current, task_name, sizeof(task_name)) < 0) {
2497 err = -EFAULT;
2498 goto __error;
2499 }
2500 memset(setup, 0, sizeof(setup));
2501 if (file->f_mode & FMODE_WRITE)
2502 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_PLAYBACK,
2503 task_name, &setup[0]);
2504 if (file->f_mode & FMODE_READ)
2505 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_CAPTURE,
2506 task_name, &setup[1]);
2507
2508 nonblock = !!(file->f_flags & O_NONBLOCK);
2509 if (!nonblock)
2510 nonblock = nonblock_open;
2511
2512 init_waitqueue_entry(&wait, current);
2513 add_wait_queue(&pcm->open_wait, &wait);
2514 mutex_lock(&pcm->open_mutex);
2515 while (1) {
2516 err = snd_pcm_oss_open_file(file, pcm, &pcm_oss_file,
2517 iminor(inode), setup);
2518 if (err >= 0)
2519 break;
2520 if (err == -EAGAIN) {
2521 if (nonblock) {
2522 err = -EBUSY;
2523 break;
2524 }
2525 } else
2526 break;
2527 set_current_state(TASK_INTERRUPTIBLE);
2528 mutex_unlock(&pcm->open_mutex);
2529 schedule();
2530 mutex_lock(&pcm->open_mutex);
2531 if (pcm->card->shutdown) {
2532 err = -ENODEV;
2533 break;
2534 }
2535 if (signal_pending(current)) {
2536 err = -ERESTARTSYS;
2537 break;
2538 }
2539 }
2540 remove_wait_queue(&pcm->open_wait, &wait);
2541 mutex_unlock(&pcm->open_mutex);
2542 if (err < 0)
2543 goto __error;
2544 snd_card_unref(pcm->card);
2545 return err;
2546
2547 __error:
2548 module_put(pcm->card->module);
2549 __error2:
2550 snd_card_file_remove(pcm->card, file);
2551 __error1:
2552 if (pcm)
2553 snd_card_unref(pcm->card);
2554 return err;
2555 }
2556
snd_pcm_oss_release(struct inode * inode,struct file * file)2557 static int snd_pcm_oss_release(struct inode *inode, struct file *file)
2558 {
2559 struct snd_pcm *pcm;
2560 struct snd_pcm_substream *substream;
2561 struct snd_pcm_oss_file *pcm_oss_file;
2562
2563 pcm_oss_file = file->private_data;
2564 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2565 if (substream == NULL)
2566 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2567 if (snd_BUG_ON(!substream))
2568 return -ENXIO;
2569 pcm = substream->pcm;
2570 if (!pcm->card->shutdown)
2571 snd_pcm_oss_sync(pcm_oss_file);
2572 mutex_lock(&pcm->open_mutex);
2573 snd_pcm_oss_release_file(pcm_oss_file);
2574 mutex_unlock(&pcm->open_mutex);
2575 wake_up(&pcm->open_wait);
2576 module_put(pcm->card->module);
2577 snd_card_file_remove(pcm->card, file);
2578 return 0;
2579 }
2580
snd_pcm_oss_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2581 static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2582 {
2583 struct snd_pcm_oss_file *pcm_oss_file;
2584 int __user *p = (int __user *)arg;
2585 int res;
2586
2587 pcm_oss_file = file->private_data;
2588 if (cmd == OSS_GETVERSION)
2589 return put_user(SNDRV_OSS_VERSION, p);
2590 if (cmd == OSS_ALSAEMULVER)
2591 return put_user(1, p);
2592 #if IS_REACHABLE(CONFIG_SND_MIXER_OSS)
2593 if (((cmd >> 8) & 0xff) == 'M') { /* mixer ioctl - for OSS compatibility */
2594 struct snd_pcm_substream *substream;
2595 int idx;
2596 for (idx = 0; idx < 2; ++idx) {
2597 substream = pcm_oss_file->streams[idx];
2598 if (substream != NULL)
2599 break;
2600 }
2601 if (snd_BUG_ON(idx >= 2))
2602 return -ENXIO;
2603 return snd_mixer_oss_ioctl_card(substream->pcm->card, cmd, arg);
2604 }
2605 #endif
2606 if (((cmd >> 8) & 0xff) != 'P')
2607 return -EINVAL;
2608 #ifdef OSS_DEBUG
2609 pr_debug("pcm_oss: ioctl = 0x%x\n", cmd);
2610 #endif
2611 switch (cmd) {
2612 case SNDCTL_DSP_RESET:
2613 return snd_pcm_oss_reset(pcm_oss_file);
2614 case SNDCTL_DSP_SYNC:
2615 return snd_pcm_oss_sync(pcm_oss_file);
2616 case SNDCTL_DSP_SPEED:
2617 if (get_user(res, p))
2618 return -EFAULT;
2619 res = snd_pcm_oss_set_rate(pcm_oss_file, res);
2620 if (res < 0)
2621 return res;
2622 return put_user(res, p);
2623 case SOUND_PCM_READ_RATE:
2624 res = snd_pcm_oss_get_rate(pcm_oss_file);
2625 if (res < 0)
2626 return res;
2627 return put_user(res, p);
2628 case SNDCTL_DSP_STEREO:
2629 if (get_user(res, p))
2630 return -EFAULT;
2631 res = res > 0 ? 2 : 1;
2632 res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2633 if (res < 0)
2634 return res;
2635 return put_user(--res, p);
2636 case SNDCTL_DSP_GETBLKSIZE:
2637 res = snd_pcm_oss_get_block_size(pcm_oss_file);
2638 if (res < 0)
2639 return res;
2640 return put_user(res, p);
2641 case SNDCTL_DSP_SETFMT:
2642 if (get_user(res, p))
2643 return -EFAULT;
2644 res = snd_pcm_oss_set_format(pcm_oss_file, res);
2645 if (res < 0)
2646 return res;
2647 return put_user(res, p);
2648 case SOUND_PCM_READ_BITS:
2649 res = snd_pcm_oss_get_format(pcm_oss_file);
2650 if (res < 0)
2651 return res;
2652 return put_user(res, p);
2653 case SNDCTL_DSP_CHANNELS:
2654 if (get_user(res, p))
2655 return -EFAULT;
2656 res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2657 if (res < 0)
2658 return res;
2659 return put_user(res, p);
2660 case SOUND_PCM_READ_CHANNELS:
2661 res = snd_pcm_oss_get_channels(pcm_oss_file);
2662 if (res < 0)
2663 return res;
2664 return put_user(res, p);
2665 case SOUND_PCM_WRITE_FILTER:
2666 case SOUND_PCM_READ_FILTER:
2667 return -EIO;
2668 case SNDCTL_DSP_POST:
2669 return snd_pcm_oss_post(pcm_oss_file);
2670 case SNDCTL_DSP_SUBDIVIDE:
2671 if (get_user(res, p))
2672 return -EFAULT;
2673 res = snd_pcm_oss_set_subdivide(pcm_oss_file, res);
2674 if (res < 0)
2675 return res;
2676 return put_user(res, p);
2677 case SNDCTL_DSP_SETFRAGMENT:
2678 if (get_user(res, p))
2679 return -EFAULT;
2680 return snd_pcm_oss_set_fragment(pcm_oss_file, res);
2681 case SNDCTL_DSP_GETFMTS:
2682 res = snd_pcm_oss_get_formats(pcm_oss_file);
2683 if (res < 0)
2684 return res;
2685 return put_user(res, p);
2686 case SNDCTL_DSP_GETOSPACE:
2687 case SNDCTL_DSP_GETISPACE:
2688 return snd_pcm_oss_get_space(pcm_oss_file,
2689 cmd == SNDCTL_DSP_GETISPACE ?
2690 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2691 (struct audio_buf_info __user *) arg);
2692 case SNDCTL_DSP_NONBLOCK:
2693 return snd_pcm_oss_nonblock(file);
2694 case SNDCTL_DSP_GETCAPS:
2695 res = snd_pcm_oss_get_caps(pcm_oss_file);
2696 if (res < 0)
2697 return res;
2698 return put_user(res, p);
2699 case SNDCTL_DSP_GETTRIGGER:
2700 res = snd_pcm_oss_get_trigger(pcm_oss_file);
2701 if (res < 0)
2702 return res;
2703 return put_user(res, p);
2704 case SNDCTL_DSP_SETTRIGGER:
2705 if (get_user(res, p))
2706 return -EFAULT;
2707 return snd_pcm_oss_set_trigger(pcm_oss_file, res);
2708 case SNDCTL_DSP_GETIPTR:
2709 case SNDCTL_DSP_GETOPTR:
2710 return snd_pcm_oss_get_ptr(pcm_oss_file,
2711 cmd == SNDCTL_DSP_GETIPTR ?
2712 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2713 (struct count_info __user *) arg);
2714 case SNDCTL_DSP_MAPINBUF:
2715 case SNDCTL_DSP_MAPOUTBUF:
2716 return snd_pcm_oss_get_mapbuf(pcm_oss_file,
2717 cmd == SNDCTL_DSP_MAPINBUF ?
2718 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2719 (struct buffmem_desc __user *) arg);
2720 case SNDCTL_DSP_SETSYNCRO:
2721 /* stop DMA now.. */
2722 return 0;
2723 case SNDCTL_DSP_SETDUPLEX:
2724 if (snd_pcm_oss_get_caps(pcm_oss_file) & DSP_CAP_DUPLEX)
2725 return 0;
2726 return -EIO;
2727 case SNDCTL_DSP_GETODELAY:
2728 res = snd_pcm_oss_get_odelay(pcm_oss_file);
2729 if (res < 0) {
2730 /* it's for sure, some broken apps don't check for error codes */
2731 put_user(0, p);
2732 return res;
2733 }
2734 return put_user(res, p);
2735 case SNDCTL_DSP_PROFILE:
2736 return 0; /* silently ignore */
2737 default:
2738 pr_debug("pcm_oss: unknown command = 0x%x\n", cmd);
2739 }
2740 return -EINVAL;
2741 }
2742
2743 #ifdef CONFIG_COMPAT
2744 /* all compatible */
snd_pcm_oss_ioctl_compat(struct file * file,unsigned int cmd,unsigned long arg)2745 static long snd_pcm_oss_ioctl_compat(struct file *file, unsigned int cmd,
2746 unsigned long arg)
2747 {
2748 /*
2749 * Everything is compatbile except SNDCTL_DSP_MAPINBUF/SNDCTL_DSP_MAPOUTBUF,
2750 * which are not implemented for the native case either
2751 */
2752 return snd_pcm_oss_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2753 }
2754 #else
2755 #define snd_pcm_oss_ioctl_compat NULL
2756 #endif
2757
snd_pcm_oss_read(struct file * file,char __user * buf,size_t count,loff_t * offset)2758 static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
2759 {
2760 struct snd_pcm_oss_file *pcm_oss_file;
2761 struct snd_pcm_substream *substream;
2762
2763 pcm_oss_file = file->private_data;
2764 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2765 if (substream == NULL)
2766 return -ENXIO;
2767 substream->f_flags = file->f_flags & O_NONBLOCK;
2768 #ifndef OSS_DEBUG
2769 return snd_pcm_oss_read1(substream, buf, count);
2770 #else
2771 {
2772 ssize_t res = snd_pcm_oss_read1(substream, buf, count);
2773 pcm_dbg(substream->pcm,
2774 "pcm_oss: read %li bytes (returned %li bytes)\n",
2775 (long)count, (long)res);
2776 return res;
2777 }
2778 #endif
2779 }
2780
snd_pcm_oss_write(struct file * file,const char __user * buf,size_t count,loff_t * offset)2781 static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
2782 {
2783 struct snd_pcm_oss_file *pcm_oss_file;
2784 struct snd_pcm_substream *substream;
2785 long result;
2786
2787 pcm_oss_file = file->private_data;
2788 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2789 if (substream == NULL)
2790 return -ENXIO;
2791 substream->f_flags = file->f_flags & O_NONBLOCK;
2792 result = snd_pcm_oss_write1(substream, buf, count);
2793 #ifdef OSS_DEBUG
2794 pcm_dbg(substream->pcm, "pcm_oss: write %li bytes (wrote %li bytes)\n",
2795 (long)count, (long)result);
2796 #endif
2797 return result;
2798 }
2799
snd_pcm_oss_playback_ready(struct snd_pcm_substream * substream)2800 static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)
2801 {
2802 struct snd_pcm_runtime *runtime = substream->runtime;
2803 if (atomic_read(&substream->mmap_count))
2804 return runtime->oss.prev_hw_ptr_period !=
2805 get_hw_ptr_period(runtime);
2806 else
2807 return snd_pcm_playback_avail(runtime) >=
2808 runtime->oss.period_frames;
2809 }
2810
snd_pcm_oss_capture_ready(struct snd_pcm_substream * substream)2811 static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)
2812 {
2813 struct snd_pcm_runtime *runtime = substream->runtime;
2814 if (atomic_read(&substream->mmap_count))
2815 return runtime->oss.prev_hw_ptr_period !=
2816 get_hw_ptr_period(runtime);
2817 else
2818 return snd_pcm_capture_avail(runtime) >=
2819 runtime->oss.period_frames;
2820 }
2821
snd_pcm_oss_poll(struct file * file,poll_table * wait)2822 static __poll_t snd_pcm_oss_poll(struct file *file, poll_table * wait)
2823 {
2824 struct snd_pcm_oss_file *pcm_oss_file;
2825 __poll_t mask;
2826 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2827
2828 pcm_oss_file = file->private_data;
2829
2830 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2831 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2832
2833 mask = 0;
2834 if (psubstream != NULL) {
2835 struct snd_pcm_runtime *runtime = psubstream->runtime;
2836 poll_wait(file, &runtime->sleep, wait);
2837 snd_pcm_stream_lock_irq(psubstream);
2838 if (runtime->status->state != SNDRV_PCM_STATE_DRAINING &&
2839 (runtime->status->state != SNDRV_PCM_STATE_RUNNING ||
2840 snd_pcm_oss_playback_ready(psubstream)))
2841 mask |= EPOLLOUT | EPOLLWRNORM;
2842 snd_pcm_stream_unlock_irq(psubstream);
2843 }
2844 if (csubstream != NULL) {
2845 struct snd_pcm_runtime *runtime = csubstream->runtime;
2846 snd_pcm_state_t ostate;
2847 poll_wait(file, &runtime->sleep, wait);
2848 snd_pcm_stream_lock_irq(csubstream);
2849 ostate = runtime->status->state;
2850 if (ostate != SNDRV_PCM_STATE_RUNNING ||
2851 snd_pcm_oss_capture_ready(csubstream))
2852 mask |= EPOLLIN | EPOLLRDNORM;
2853 snd_pcm_stream_unlock_irq(csubstream);
2854 if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) {
2855 struct snd_pcm_oss_file ofile;
2856 memset(&ofile, 0, sizeof(ofile));
2857 ofile.streams[SNDRV_PCM_STREAM_CAPTURE] = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2858 runtime->oss.trigger = 0;
2859 snd_pcm_oss_set_trigger(&ofile, PCM_ENABLE_INPUT);
2860 }
2861 }
2862
2863 return mask;
2864 }
2865
snd_pcm_oss_mmap(struct file * file,struct vm_area_struct * area)2866 static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area)
2867 {
2868 struct snd_pcm_oss_file *pcm_oss_file;
2869 struct snd_pcm_substream *substream = NULL;
2870 struct snd_pcm_runtime *runtime;
2871 int err;
2872
2873 #ifdef OSS_DEBUG
2874 pr_debug("pcm_oss: mmap begin\n");
2875 #endif
2876 pcm_oss_file = file->private_data;
2877 switch ((area->vm_flags & (VM_READ | VM_WRITE))) {
2878 case VM_READ | VM_WRITE:
2879 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2880 if (substream)
2881 break;
2882 fallthrough;
2883 case VM_READ:
2884 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2885 break;
2886 case VM_WRITE:
2887 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2888 break;
2889 default:
2890 return -EINVAL;
2891 }
2892 /* set VM_READ access as well to fix memset() routines that do
2893 reads before writes (to improve performance) */
2894 area->vm_flags |= VM_READ;
2895 if (substream == NULL)
2896 return -ENXIO;
2897 runtime = substream->runtime;
2898 if (!(runtime->info & SNDRV_PCM_INFO_MMAP_VALID))
2899 return -EIO;
2900 if (runtime->info & SNDRV_PCM_INFO_INTERLEAVED)
2901 runtime->access = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2902 else
2903 return -EIO;
2904
2905 if (runtime->oss.params) {
2906 /* use mutex_trylock() for params_lock for avoiding a deadlock
2907 * between mmap_lock and params_lock taken by
2908 * copy_from/to_user() in snd_pcm_oss_write/read()
2909 */
2910 err = snd_pcm_oss_change_params(substream, true);
2911 if (err < 0)
2912 return err;
2913 }
2914 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2915 if (runtime->oss.plugin_first != NULL)
2916 return -EIO;
2917 #endif
2918
2919 if (area->vm_pgoff != 0)
2920 return -EINVAL;
2921
2922 err = snd_pcm_mmap_data(substream, file, area);
2923 if (err < 0)
2924 return err;
2925 runtime->oss.mmap_bytes = area->vm_end - area->vm_start;
2926 runtime->silence_threshold = 0;
2927 runtime->silence_size = 0;
2928 #ifdef OSS_DEBUG
2929 pr_debug("pcm_oss: mmap ok, bytes = 0x%x\n",
2930 runtime->oss.mmap_bytes);
2931 #endif
2932 /* In mmap mode we never stop */
2933 runtime->stop_threshold = runtime->boundary;
2934
2935 return 0;
2936 }
2937
2938 #ifdef CONFIG_SND_VERBOSE_PROCFS
2939 /*
2940 * /proc interface
2941 */
2942
snd_pcm_oss_proc_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)2943 static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
2944 struct snd_info_buffer *buffer)
2945 {
2946 struct snd_pcm_str *pstr = entry->private_data;
2947 struct snd_pcm_oss_setup *setup = pstr->oss.setup_list;
2948 mutex_lock(&pstr->oss.setup_mutex);
2949 while (setup) {
2950 snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s\n",
2951 setup->task_name,
2952 setup->periods,
2953 setup->period_size,
2954 setup->disable ? " disable" : "",
2955 setup->direct ? " direct" : "",
2956 setup->block ? " block" : "",
2957 setup->nonblock ? " non-block" : "",
2958 setup->partialfrag ? " partial-frag" : "",
2959 setup->nosilence ? " no-silence" : "");
2960 setup = setup->next;
2961 }
2962 mutex_unlock(&pstr->oss.setup_mutex);
2963 }
2964
snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)2965 static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)
2966 {
2967 struct snd_pcm_oss_setup *setup, *setupn;
2968
2969 for (setup = pstr->oss.setup_list, pstr->oss.setup_list = NULL;
2970 setup; setup = setupn) {
2971 setupn = setup->next;
2972 kfree(setup->task_name);
2973 kfree(setup);
2974 }
2975 pstr->oss.setup_list = NULL;
2976 }
2977
snd_pcm_oss_proc_write(struct snd_info_entry * entry,struct snd_info_buffer * buffer)2978 static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
2979 struct snd_info_buffer *buffer)
2980 {
2981 struct snd_pcm_str *pstr = entry->private_data;
2982 char line[128], str[32], task_name[32];
2983 const char *ptr;
2984 int idx1;
2985 struct snd_pcm_oss_setup *setup, *setup1, template;
2986
2987 while (!snd_info_get_line(buffer, line, sizeof(line))) {
2988 mutex_lock(&pstr->oss.setup_mutex);
2989 memset(&template, 0, sizeof(template));
2990 ptr = snd_info_get_str(task_name, line, sizeof(task_name));
2991 if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) {
2992 snd_pcm_oss_proc_free_setup_list(pstr);
2993 mutex_unlock(&pstr->oss.setup_mutex);
2994 continue;
2995 }
2996 for (setup = pstr->oss.setup_list; setup; setup = setup->next) {
2997 if (!strcmp(setup->task_name, task_name)) {
2998 template = *setup;
2999 break;
3000 }
3001 }
3002 ptr = snd_info_get_str(str, ptr, sizeof(str));
3003 template.periods = simple_strtoul(str, NULL, 10);
3004 ptr = snd_info_get_str(str, ptr, sizeof(str));
3005 template.period_size = simple_strtoul(str, NULL, 10);
3006 for (idx1 = 31; idx1 >= 0; idx1--)
3007 if (template.period_size & (1 << idx1))
3008 break;
3009 for (idx1--; idx1 >= 0; idx1--)
3010 template.period_size &= ~(1 << idx1);
3011 do {
3012 ptr = snd_info_get_str(str, ptr, sizeof(str));
3013 if (!strcmp(str, "disable")) {
3014 template.disable = 1;
3015 } else if (!strcmp(str, "direct")) {
3016 template.direct = 1;
3017 } else if (!strcmp(str, "block")) {
3018 template.block = 1;
3019 } else if (!strcmp(str, "non-block")) {
3020 template.nonblock = 1;
3021 } else if (!strcmp(str, "partial-frag")) {
3022 template.partialfrag = 1;
3023 } else if (!strcmp(str, "no-silence")) {
3024 template.nosilence = 1;
3025 } else if (!strcmp(str, "buggy-ptr")) {
3026 template.buggyptr = 1;
3027 }
3028 } while (*str);
3029 if (setup == NULL) {
3030 setup = kmalloc(sizeof(*setup), GFP_KERNEL);
3031 if (! setup) {
3032 buffer->error = -ENOMEM;
3033 mutex_unlock(&pstr->oss.setup_mutex);
3034 return;
3035 }
3036 if (pstr->oss.setup_list == NULL)
3037 pstr->oss.setup_list = setup;
3038 else {
3039 for (setup1 = pstr->oss.setup_list;
3040 setup1->next; setup1 = setup1->next);
3041 setup1->next = setup;
3042 }
3043 template.task_name = kstrdup(task_name, GFP_KERNEL);
3044 if (! template.task_name) {
3045 kfree(setup);
3046 buffer->error = -ENOMEM;
3047 mutex_unlock(&pstr->oss.setup_mutex);
3048 return;
3049 }
3050 }
3051 *setup = template;
3052 mutex_unlock(&pstr->oss.setup_mutex);
3053 }
3054 }
3055
snd_pcm_oss_proc_init(struct snd_pcm * pcm)3056 static void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3057 {
3058 int stream;
3059 for (stream = 0; stream < 2; ++stream) {
3060 struct snd_info_entry *entry;
3061 struct snd_pcm_str *pstr = &pcm->streams[stream];
3062 if (pstr->substream_count == 0)
3063 continue;
3064 entry = snd_info_create_card_entry(pcm->card, "oss", pstr->proc_root);
3065 if (entry) {
3066 entry->content = SNDRV_INFO_CONTENT_TEXT;
3067 entry->mode = S_IFREG | 0644;
3068 entry->c.text.read = snd_pcm_oss_proc_read;
3069 entry->c.text.write = snd_pcm_oss_proc_write;
3070 entry->private_data = pstr;
3071 if (snd_info_register(entry) < 0) {
3072 snd_info_free_entry(entry);
3073 entry = NULL;
3074 }
3075 }
3076 pstr->oss.proc_entry = entry;
3077 }
3078 }
3079
snd_pcm_oss_proc_done(struct snd_pcm * pcm)3080 static void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3081 {
3082 int stream;
3083 for (stream = 0; stream < 2; ++stream) {
3084 struct snd_pcm_str *pstr = &pcm->streams[stream];
3085 snd_info_free_entry(pstr->oss.proc_entry);
3086 pstr->oss.proc_entry = NULL;
3087 snd_pcm_oss_proc_free_setup_list(pstr);
3088 }
3089 }
3090 #else /* !CONFIG_SND_VERBOSE_PROCFS */
snd_pcm_oss_proc_init(struct snd_pcm * pcm)3091 static inline void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3092 {
3093 }
snd_pcm_oss_proc_done(struct snd_pcm * pcm)3094 static inline void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3095 {
3096 }
3097 #endif /* CONFIG_SND_VERBOSE_PROCFS */
3098
3099 /*
3100 * ENTRY functions
3101 */
3102
3103 static const struct file_operations snd_pcm_oss_f_reg =
3104 {
3105 .owner = THIS_MODULE,
3106 .read = snd_pcm_oss_read,
3107 .write = snd_pcm_oss_write,
3108 .open = snd_pcm_oss_open,
3109 .release = snd_pcm_oss_release,
3110 .llseek = no_llseek,
3111 .poll = snd_pcm_oss_poll,
3112 .unlocked_ioctl = snd_pcm_oss_ioctl,
3113 .compat_ioctl = snd_pcm_oss_ioctl_compat,
3114 .mmap = snd_pcm_oss_mmap,
3115 };
3116
register_oss_dsp(struct snd_pcm * pcm,int index)3117 static void register_oss_dsp(struct snd_pcm *pcm, int index)
3118 {
3119 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3120 pcm->card, index, &snd_pcm_oss_f_reg,
3121 pcm) < 0) {
3122 pcm_err(pcm, "unable to register OSS PCM device %i:%i\n",
3123 pcm->card->number, pcm->device);
3124 }
3125 }
3126
snd_pcm_oss_register_minor(struct snd_pcm * pcm)3127 static int snd_pcm_oss_register_minor(struct snd_pcm *pcm)
3128 {
3129 pcm->oss.reg = 0;
3130 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3131 char name[128];
3132 int duplex;
3133 register_oss_dsp(pcm, 0);
3134 duplex = (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count > 0 &&
3135 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count &&
3136 !(pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX));
3137 sprintf(name, "%s%s", pcm->name, duplex ? " (DUPLEX)" : "");
3138 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3139 snd_oss_info_register(SNDRV_OSS_INFO_DEV_AUDIO,
3140 pcm->card->number,
3141 name);
3142 #endif
3143 pcm->oss.reg++;
3144 pcm->oss.reg_mask |= 1;
3145 }
3146 if (adsp_map[pcm->card->number] == (int)pcm->device) {
3147 register_oss_dsp(pcm, 1);
3148 pcm->oss.reg++;
3149 pcm->oss.reg_mask |= 2;
3150 }
3151
3152 if (pcm->oss.reg)
3153 snd_pcm_oss_proc_init(pcm);
3154
3155 return 0;
3156 }
3157
snd_pcm_oss_disconnect_minor(struct snd_pcm * pcm)3158 static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm)
3159 {
3160 if (pcm->oss.reg) {
3161 if (pcm->oss.reg_mask & 1) {
3162 pcm->oss.reg_mask &= ~1;
3163 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3164 pcm->card, 0);
3165 }
3166 if (pcm->oss.reg_mask & 2) {
3167 pcm->oss.reg_mask &= ~2;
3168 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3169 pcm->card, 1);
3170 }
3171 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3172 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3173 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number);
3174 #endif
3175 }
3176 pcm->oss.reg = 0;
3177 }
3178 return 0;
3179 }
3180
snd_pcm_oss_unregister_minor(struct snd_pcm * pcm)3181 static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm)
3182 {
3183 snd_pcm_oss_disconnect_minor(pcm);
3184 snd_pcm_oss_proc_done(pcm);
3185 return 0;
3186 }
3187
3188 static struct snd_pcm_notify snd_pcm_oss_notify =
3189 {
3190 .n_register = snd_pcm_oss_register_minor,
3191 .n_disconnect = snd_pcm_oss_disconnect_minor,
3192 .n_unregister = snd_pcm_oss_unregister_minor,
3193 };
3194
alsa_pcm_oss_init(void)3195 static int __init alsa_pcm_oss_init(void)
3196 {
3197 int i;
3198 int err;
3199
3200 /* check device map table */
3201 for (i = 0; i < SNDRV_CARDS; i++) {
3202 if (dsp_map[i] < 0 || dsp_map[i] >= SNDRV_PCM_DEVICES) {
3203 pr_err("ALSA: pcm_oss: invalid dsp_map[%d] = %d\n",
3204 i, dsp_map[i]);
3205 dsp_map[i] = 0;
3206 }
3207 if (adsp_map[i] < 0 || adsp_map[i] >= SNDRV_PCM_DEVICES) {
3208 pr_err("ALSA: pcm_oss: invalid adsp_map[%d] = %d\n",
3209 i, adsp_map[i]);
3210 adsp_map[i] = 1;
3211 }
3212 }
3213 err = snd_pcm_notify(&snd_pcm_oss_notify, 0);
3214 if (err < 0)
3215 return err;
3216 return 0;
3217 }
3218
alsa_pcm_oss_exit(void)3219 static void __exit alsa_pcm_oss_exit(void)
3220 {
3221 snd_pcm_notify(&snd_pcm_oss_notify, 1);
3222 }
3223
3224 module_init(alsa_pcm_oss_init)
3225 module_exit(alsa_pcm_oss_exit)
3226
