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 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 ssize_t s;
686 ssize_t oss_buffer_size;
687 ssize_t oss_period_size, oss_periods;
688 ssize_t min_period_size, max_period_size;
689 struct snd_pcm_runtime *runtime = substream->runtime;
690 size_t oss_frame_size;
691
692 oss_frame_size = snd_pcm_format_physical_width(params_format(oss_params)) *
693 params_channels(oss_params) / 8;
694
695 oss_buffer_size = snd_pcm_hw_param_value_max(slave_params,
696 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
697 NULL);
698 if (oss_buffer_size <= 0)
699 return -EINVAL;
700 oss_buffer_size = snd_pcm_plug_client_size(substream,
701 oss_buffer_size * oss_frame_size);
702 if (oss_buffer_size <= 0)
703 return -EINVAL;
704 oss_buffer_size = rounddown_pow_of_two(oss_buffer_size);
705 if (atomic_read(&substream->mmap_count)) {
706 if (oss_buffer_size > runtime->oss.mmap_bytes)
707 oss_buffer_size = runtime->oss.mmap_bytes;
708 }
709
710 if (substream->oss.setup.period_size > 16)
711 oss_period_size = substream->oss.setup.period_size;
712 else if (runtime->oss.fragshift) {
713 oss_period_size = 1 << runtime->oss.fragshift;
714 if (oss_period_size > oss_buffer_size / 2)
715 oss_period_size = oss_buffer_size / 2;
716 } else {
717 int sd;
718 size_t bytes_per_sec = params_rate(oss_params) * snd_pcm_format_physical_width(params_format(oss_params)) * params_channels(oss_params) / 8;
719
720 oss_period_size = oss_buffer_size;
721 do {
722 oss_period_size /= 2;
723 } while (oss_period_size > bytes_per_sec);
724 if (runtime->oss.subdivision == 0) {
725 sd = 4;
726 if (oss_period_size / sd > 4096)
727 sd *= 2;
728 if (oss_period_size / sd < 4096)
729 sd = 1;
730 } else
731 sd = runtime->oss.subdivision;
732 oss_period_size /= sd;
733 if (oss_period_size < 16)
734 oss_period_size = 16;
735 }
736
737 min_period_size = snd_pcm_plug_client_size(substream,
738 snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
739 if (min_period_size > 0) {
740 min_period_size *= oss_frame_size;
741 min_period_size = roundup_pow_of_two(min_period_size);
742 if (oss_period_size < min_period_size)
743 oss_period_size = min_period_size;
744 }
745
746 max_period_size = snd_pcm_plug_client_size(substream,
747 snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
748 if (max_period_size > 0) {
749 max_period_size *= oss_frame_size;
750 max_period_size = rounddown_pow_of_two(max_period_size);
751 if (oss_period_size > max_period_size)
752 oss_period_size = max_period_size;
753 }
754
755 oss_periods = oss_buffer_size / oss_period_size;
756
757 if (substream->oss.setup.periods > 1)
758 oss_periods = substream->oss.setup.periods;
759
760 s = snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
761 if (s > 0 && runtime->oss.maxfrags && s > runtime->oss.maxfrags)
762 s = runtime->oss.maxfrags;
763 if (oss_periods > s)
764 oss_periods = s;
765
766 s = snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
767 if (s < 2)
768 s = 2;
769 if (oss_periods < s)
770 oss_periods = s;
771
772 while (oss_period_size * oss_periods > oss_buffer_size)
773 oss_period_size /= 2;
774
775 if (oss_period_size < 16)
776 return -EINVAL;
777
778 /* don't allocate too large period; 1MB period must be enough */
779 if (oss_period_size > 1024 * 1024)
780 return -ENOMEM;
781
782 runtime->oss.period_bytes = oss_period_size;
783 runtime->oss.period_frames = 1;
784 runtime->oss.periods = oss_periods;
785 return 0;
786 }
787
choose_rate(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,unsigned int best_rate)788 static int choose_rate(struct snd_pcm_substream *substream,
789 struct snd_pcm_hw_params *params, unsigned int best_rate)
790 {
791 const struct snd_interval *it;
792 struct snd_pcm_hw_params *save;
793 unsigned int rate, prev;
794
795 save = kmalloc(sizeof(*save), GFP_KERNEL);
796 if (save == NULL)
797 return -ENOMEM;
798 *save = *params;
799 it = hw_param_interval_c(save, SNDRV_PCM_HW_PARAM_RATE);
800
801 /* try multiples of the best rate */
802 rate = best_rate;
803 for (;;) {
804 if (it->max < rate || (it->max == rate && it->openmax))
805 break;
806 if (it->min < rate || (it->min == rate && !it->openmin)) {
807 int ret;
808 ret = snd_pcm_hw_param_set(substream, params,
809 SNDRV_PCM_HW_PARAM_RATE,
810 rate, 0);
811 if (ret == (int)rate) {
812 kfree(save);
813 return rate;
814 }
815 *params = *save;
816 }
817 prev = rate;
818 rate += best_rate;
819 if (rate <= prev)
820 break;
821 }
822
823 /* not found, use the nearest rate */
824 kfree(save);
825 return snd_pcm_hw_param_near(substream, params, SNDRV_PCM_HW_PARAM_RATE, best_rate, NULL);
826 }
827
828 /* parameter locking: returns immediately if tried during streaming */
lock_params(struct snd_pcm_runtime * runtime)829 static int lock_params(struct snd_pcm_runtime *runtime)
830 {
831 if (mutex_lock_interruptible(&runtime->oss.params_lock))
832 return -ERESTARTSYS;
833 if (atomic_read(&runtime->oss.rw_ref)) {
834 mutex_unlock(&runtime->oss.params_lock);
835 return -EBUSY;
836 }
837 return 0;
838 }
839
unlock_params(struct snd_pcm_runtime * runtime)840 static void unlock_params(struct snd_pcm_runtime *runtime)
841 {
842 mutex_unlock(&runtime->oss.params_lock);
843 }
844
snd_pcm_oss_release_buffers(struct snd_pcm_substream * substream)845 static void snd_pcm_oss_release_buffers(struct snd_pcm_substream *substream)
846 {
847 struct snd_pcm_runtime *runtime = substream->runtime;
848
849 kvfree(runtime->oss.buffer);
850 runtime->oss.buffer = NULL;
851 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
852 snd_pcm_oss_plugin_clear(substream);
853 #endif
854 }
855
856 /* call with params_lock held */
snd_pcm_oss_change_params_locked(struct snd_pcm_substream * substream)857 static int snd_pcm_oss_change_params_locked(struct snd_pcm_substream *substream)
858 {
859 struct snd_pcm_runtime *runtime = substream->runtime;
860 struct snd_pcm_hw_params *params, *sparams;
861 struct snd_pcm_sw_params *sw_params;
862 ssize_t oss_buffer_size, oss_period_size;
863 size_t oss_frame_size;
864 int err;
865 int direct;
866 snd_pcm_format_t format, sformat;
867 int n;
868 const struct snd_mask *sformat_mask;
869 struct snd_mask mask;
870
871 if (!runtime->oss.params)
872 return 0;
873 sw_params = kzalloc(sizeof(*sw_params), GFP_KERNEL);
874 params = kmalloc(sizeof(*params), GFP_KERNEL);
875 sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
876 if (!sw_params || !params || !sparams) {
877 err = -ENOMEM;
878 goto failure;
879 }
880
881 if (atomic_read(&substream->mmap_count))
882 direct = 1;
883 else
884 direct = substream->oss.setup.direct;
885
886 _snd_pcm_hw_params_any(sparams);
887 _snd_pcm_hw_param_setinteger(sparams, SNDRV_PCM_HW_PARAM_PERIODS);
888 _snd_pcm_hw_param_min(sparams, SNDRV_PCM_HW_PARAM_PERIODS, 2, 0);
889 snd_mask_none(&mask);
890 if (atomic_read(&substream->mmap_count))
891 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
892 else {
893 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED);
894 if (!direct)
895 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
896 }
897 err = snd_pcm_hw_param_mask(substream, sparams, SNDRV_PCM_HW_PARAM_ACCESS, &mask);
898 if (err < 0) {
899 pcm_dbg(substream->pcm, "No usable accesses\n");
900 err = -EINVAL;
901 goto failure;
902 }
903
904 err = choose_rate(substream, sparams, runtime->oss.rate);
905 if (err < 0)
906 goto failure;
907 err = snd_pcm_hw_param_near(substream, sparams,
908 SNDRV_PCM_HW_PARAM_CHANNELS,
909 runtime->oss.channels, NULL);
910 if (err < 0)
911 goto failure;
912
913 format = snd_pcm_oss_format_from(runtime->oss.format);
914
915 sformat_mask = hw_param_mask_c(sparams, SNDRV_PCM_HW_PARAM_FORMAT);
916 if (direct)
917 sformat = format;
918 else
919 sformat = snd_pcm_plug_slave_format(format, sformat_mask);
920
921 if ((__force int)sformat < 0 ||
922 !snd_mask_test_format(sformat_mask, sformat)) {
923 pcm_for_each_format(sformat) {
924 if (snd_mask_test_format(sformat_mask, sformat) &&
925 snd_pcm_oss_format_to(sformat) >= 0)
926 goto format_found;
927 }
928 pcm_dbg(substream->pcm, "Cannot find a format!!!\n");
929 err = -EINVAL;
930 goto failure;
931 }
932 format_found:
933 err = _snd_pcm_hw_param_set(sparams, SNDRV_PCM_HW_PARAM_FORMAT, (__force int)sformat, 0);
934 if (err < 0)
935 goto failure;
936
937 if (direct) {
938 memcpy(params, sparams, sizeof(*params));
939 } else {
940 _snd_pcm_hw_params_any(params);
941 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
942 (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED, 0);
943 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
944 (__force int)snd_pcm_oss_format_from(runtime->oss.format), 0);
945 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
946 runtime->oss.channels, 0);
947 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
948 runtime->oss.rate, 0);
949 pdprintf("client: access = %i, format = %i, channels = %i, rate = %i\n",
950 params_access(params), params_format(params),
951 params_channels(params), params_rate(params));
952 }
953 pdprintf("slave: access = %i, format = %i, channels = %i, rate = %i\n",
954 params_access(sparams), params_format(sparams),
955 params_channels(sparams), params_rate(sparams));
956
957 oss_frame_size = snd_pcm_format_physical_width(params_format(params)) *
958 params_channels(params) / 8;
959
960 err = snd_pcm_oss_period_size(substream, params, sparams);
961 if (err < 0)
962 goto failure;
963
964 n = snd_pcm_plug_slave_size(substream, runtime->oss.period_bytes / oss_frame_size);
965 err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, n, NULL);
966 if (err < 0)
967 goto failure;
968
969 err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIODS,
970 runtime->oss.periods, NULL);
971 if (err < 0)
972 goto failure;
973
974 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
975
976 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, sparams);
977 if (err < 0) {
978 pcm_dbg(substream->pcm, "HW_PARAMS failed: %i\n", err);
979 goto failure;
980 }
981
982 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
983 snd_pcm_oss_plugin_clear(substream);
984 if (!direct) {
985 /* add necessary plugins */
986 err = snd_pcm_plug_format_plugins(substream, params, sparams);
987 if (err < 0) {
988 pcm_dbg(substream->pcm,
989 "snd_pcm_plug_format_plugins failed: %i\n", err);
990 goto failure;
991 }
992 if (runtime->oss.plugin_first) {
993 struct snd_pcm_plugin *plugin;
994 err = snd_pcm_plugin_build_io(substream, sparams, &plugin);
995 if (err < 0) {
996 pcm_dbg(substream->pcm,
997 "snd_pcm_plugin_build_io failed: %i\n", err);
998 goto failure;
999 }
1000 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1001 err = snd_pcm_plugin_append(plugin);
1002 } else {
1003 err = snd_pcm_plugin_insert(plugin);
1004 }
1005 if (err < 0)
1006 goto failure;
1007 }
1008 }
1009 #endif
1010
1011 if (runtime->oss.trigger) {
1012 sw_params->start_threshold = 1;
1013 } else {
1014 sw_params->start_threshold = runtime->boundary;
1015 }
1016 if (atomic_read(&substream->mmap_count) ||
1017 substream->stream == SNDRV_PCM_STREAM_CAPTURE)
1018 sw_params->stop_threshold = runtime->boundary;
1019 else
1020 sw_params->stop_threshold = runtime->buffer_size;
1021 sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
1022 sw_params->period_step = 1;
1023 sw_params->avail_min = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
1024 1 : runtime->period_size;
1025 if (atomic_read(&substream->mmap_count) ||
1026 substream->oss.setup.nosilence) {
1027 sw_params->silence_threshold = 0;
1028 sw_params->silence_size = 0;
1029 } else {
1030 snd_pcm_uframes_t frames;
1031 frames = runtime->period_size + 16;
1032 if (frames > runtime->buffer_size)
1033 frames = runtime->buffer_size;
1034 sw_params->silence_threshold = frames;
1035 sw_params->silence_size = frames;
1036 }
1037
1038 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_SW_PARAMS, sw_params);
1039 if (err < 0) {
1040 pcm_dbg(substream->pcm, "SW_PARAMS failed: %i\n", err);
1041 goto failure;
1042 }
1043
1044 runtime->oss.periods = params_periods(sparams);
1045 oss_period_size = snd_pcm_plug_client_size(substream, params_period_size(sparams));
1046 if (oss_period_size < 0) {
1047 err = -EINVAL;
1048 goto failure;
1049 }
1050 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1051 if (runtime->oss.plugin_first) {
1052 err = snd_pcm_plug_alloc(substream, oss_period_size);
1053 if (err < 0)
1054 goto failure;
1055 }
1056 #endif
1057 oss_period_size = array_size(oss_period_size, oss_frame_size);
1058 oss_buffer_size = array_size(oss_period_size, runtime->oss.periods);
1059 if (oss_buffer_size <= 0) {
1060 err = -EINVAL;
1061 goto failure;
1062 }
1063
1064 runtime->oss.period_bytes = oss_period_size;
1065 runtime->oss.buffer_bytes = oss_buffer_size;
1066
1067 pdprintf("oss: period bytes = %i, buffer bytes = %i\n",
1068 runtime->oss.period_bytes,
1069 runtime->oss.buffer_bytes);
1070 pdprintf("slave: period_size = %i, buffer_size = %i\n",
1071 params_period_size(sparams),
1072 params_buffer_size(sparams));
1073
1074 runtime->oss.format = snd_pcm_oss_format_to(params_format(params));
1075 runtime->oss.channels = params_channels(params);
1076 runtime->oss.rate = params_rate(params);
1077
1078 kvfree(runtime->oss.buffer);
1079 runtime->oss.buffer = kvzalloc(runtime->oss.period_bytes, GFP_KERNEL);
1080 if (!runtime->oss.buffer) {
1081 err = -ENOMEM;
1082 goto failure;
1083 }
1084
1085 runtime->oss.params = 0;
1086 runtime->oss.prepare = 1;
1087 runtime->oss.buffer_used = 0;
1088 if (runtime->dma_area)
1089 snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes));
1090
1091 runtime->oss.period_frames = snd_pcm_alsa_frames(substream, oss_period_size);
1092
1093 err = 0;
1094 failure:
1095 if (err)
1096 snd_pcm_oss_release_buffers(substream);
1097 kfree(sw_params);
1098 kfree(params);
1099 kfree(sparams);
1100 return err;
1101 }
1102
1103 /* this one takes the lock by itself */
snd_pcm_oss_change_params(struct snd_pcm_substream * substream,bool trylock)1104 static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
1105 bool trylock)
1106 {
1107 struct snd_pcm_runtime *runtime = substream->runtime;
1108 int err;
1109
1110 if (trylock) {
1111 if (!(mutex_trylock(&runtime->oss.params_lock)))
1112 return -EAGAIN;
1113 } else if (mutex_lock_interruptible(&runtime->oss.params_lock))
1114 return -ERESTARTSYS;
1115
1116 err = snd_pcm_oss_change_params_locked(substream);
1117 mutex_unlock(&runtime->oss.params_lock);
1118 return err;
1119 }
1120
snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file * pcm_oss_file,struct snd_pcm_substream ** r_substream)1121 static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream)
1122 {
1123 int idx, err;
1124 struct snd_pcm_substream *asubstream = NULL, *substream;
1125
1126 for (idx = 0; idx < 2; idx++) {
1127 substream = pcm_oss_file->streams[idx];
1128 if (substream == NULL)
1129 continue;
1130 if (asubstream == NULL)
1131 asubstream = substream;
1132 if (substream->runtime->oss.params) {
1133 err = snd_pcm_oss_change_params(substream, false);
1134 if (err < 0)
1135 return err;
1136 }
1137 }
1138 if (!asubstream)
1139 return -EIO;
1140 if (r_substream)
1141 *r_substream = asubstream;
1142 return 0;
1143 }
1144
1145 /* call with params_lock held */
1146 /* NOTE: this always call PREPARE unconditionally no matter whether
1147 * runtime->oss.prepare is set or not
1148 */
snd_pcm_oss_prepare(struct snd_pcm_substream * substream)1149 static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
1150 {
1151 int err;
1152 struct snd_pcm_runtime *runtime = substream->runtime;
1153
1154 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
1155 if (err < 0) {
1156 pcm_dbg(substream->pcm,
1157 "snd_pcm_oss_prepare: SNDRV_PCM_IOCTL_PREPARE failed\n");
1158 return err;
1159 }
1160 runtime->oss.prepare = 0;
1161 runtime->oss.prev_hw_ptr_period = 0;
1162 runtime->oss.period_ptr = 0;
1163 runtime->oss.buffer_used = 0;
1164
1165 return 0;
1166 }
1167
snd_pcm_oss_make_ready(struct snd_pcm_substream * substream)1168 static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream)
1169 {
1170 struct snd_pcm_runtime *runtime;
1171 int err;
1172
1173 runtime = substream->runtime;
1174 if (runtime->oss.params) {
1175 err = snd_pcm_oss_change_params(substream, false);
1176 if (err < 0)
1177 return err;
1178 }
1179 if (runtime->oss.prepare) {
1180 if (mutex_lock_interruptible(&runtime->oss.params_lock))
1181 return -ERESTARTSYS;
1182 err = snd_pcm_oss_prepare(substream);
1183 mutex_unlock(&runtime->oss.params_lock);
1184 if (err < 0)
1185 return err;
1186 }
1187 return 0;
1188 }
1189
1190 /* call with params_lock held */
snd_pcm_oss_make_ready_locked(struct snd_pcm_substream * substream)1191 static int snd_pcm_oss_make_ready_locked(struct snd_pcm_substream *substream)
1192 {
1193 struct snd_pcm_runtime *runtime;
1194 int err;
1195
1196 runtime = substream->runtime;
1197 if (runtime->oss.params) {
1198 err = snd_pcm_oss_change_params_locked(substream);
1199 if (err < 0)
1200 return err;
1201 }
1202 if (runtime->oss.prepare) {
1203 err = snd_pcm_oss_prepare(substream);
1204 if (err < 0)
1205 return err;
1206 }
1207 return 0;
1208 }
1209
snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream * substream,snd_pcm_sframes_t * delay)1210 static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay)
1211 {
1212 struct snd_pcm_runtime *runtime;
1213 snd_pcm_uframes_t frames;
1214 int err = 0;
1215
1216 while (1) {
1217 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, delay);
1218 if (err < 0)
1219 break;
1220 runtime = substream->runtime;
1221 if (*delay <= (snd_pcm_sframes_t)runtime->buffer_size)
1222 break;
1223 /* in case of overrun, skip whole periods like OSS/Linux driver does */
1224 /* until avail(delay) <= buffer_size */
1225 frames = (*delay - runtime->buffer_size) + runtime->period_size - 1;
1226 frames /= runtime->period_size;
1227 frames *= runtime->period_size;
1228 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_FORWARD, &frames);
1229 if (err < 0)
1230 break;
1231 }
1232 return err;
1233 }
1234
snd_pcm_oss_write3(struct snd_pcm_substream * substream,const char * ptr,snd_pcm_uframes_t frames,int in_kernel)1235 snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1236 {
1237 struct snd_pcm_runtime *runtime = substream->runtime;
1238 int ret;
1239 while (1) {
1240 if (runtime->state == SNDRV_PCM_STATE_XRUN ||
1241 runtime->state == SNDRV_PCM_STATE_SUSPENDED) {
1242 #ifdef OSS_DEBUG
1243 pcm_dbg(substream->pcm,
1244 "pcm_oss: write: recovering from %s\n",
1245 runtime->state == SNDRV_PCM_STATE_XRUN ?
1246 "XRUN" : "SUSPEND");
1247 #endif
1248 ret = snd_pcm_oss_prepare(substream);
1249 if (ret < 0)
1250 break;
1251 }
1252 mutex_unlock(&runtime->oss.params_lock);
1253 ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1254 frames, in_kernel);
1255 mutex_lock(&runtime->oss.params_lock);
1256 if (ret != -EPIPE && ret != -ESTRPIPE)
1257 break;
1258 /* test, if we can't store new data, because the stream */
1259 /* has not been started */
1260 if (runtime->state == SNDRV_PCM_STATE_PREPARED)
1261 return -EAGAIN;
1262 }
1263 return ret;
1264 }
1265
snd_pcm_oss_read3(struct snd_pcm_substream * substream,char * ptr,snd_pcm_uframes_t frames,int in_kernel)1266 snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1267 {
1268 struct snd_pcm_runtime *runtime = substream->runtime;
1269 snd_pcm_sframes_t delay;
1270 int ret;
1271 while (1) {
1272 if (runtime->state == SNDRV_PCM_STATE_XRUN ||
1273 runtime->state == SNDRV_PCM_STATE_SUSPENDED) {
1274 #ifdef OSS_DEBUG
1275 pcm_dbg(substream->pcm,
1276 "pcm_oss: read: recovering from %s\n",
1277 runtime->state == SNDRV_PCM_STATE_XRUN ?
1278 "XRUN" : "SUSPEND");
1279 #endif
1280 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1281 if (ret < 0)
1282 break;
1283 } else if (runtime->state == SNDRV_PCM_STATE_SETUP) {
1284 ret = snd_pcm_oss_prepare(substream);
1285 if (ret < 0)
1286 break;
1287 }
1288 ret = snd_pcm_oss_capture_position_fixup(substream, &delay);
1289 if (ret < 0)
1290 break;
1291 mutex_unlock(&runtime->oss.params_lock);
1292 ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1293 frames, in_kernel);
1294 mutex_lock(&runtime->oss.params_lock);
1295 if (ret == -EPIPE) {
1296 if (runtime->state == SNDRV_PCM_STATE_DRAINING) {
1297 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1298 if (ret < 0)
1299 break;
1300 }
1301 continue;
1302 }
1303 if (ret != -ESTRPIPE)
1304 break;
1305 }
1306 return ret;
1307 }
1308
1309 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
snd_pcm_oss_writev3(struct snd_pcm_substream * substream,void ** bufs,snd_pcm_uframes_t frames)1310 snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1311 {
1312 struct snd_pcm_runtime *runtime = substream->runtime;
1313 int ret;
1314 while (1) {
1315 if (runtime->state == SNDRV_PCM_STATE_XRUN ||
1316 runtime->state == SNDRV_PCM_STATE_SUSPENDED) {
1317 #ifdef OSS_DEBUG
1318 pcm_dbg(substream->pcm,
1319 "pcm_oss: writev: recovering from %s\n",
1320 runtime->state == SNDRV_PCM_STATE_XRUN ?
1321 "XRUN" : "SUSPEND");
1322 #endif
1323 ret = snd_pcm_oss_prepare(substream);
1324 if (ret < 0)
1325 break;
1326 }
1327 ret = snd_pcm_kernel_writev(substream, bufs, frames);
1328 if (ret != -EPIPE && ret != -ESTRPIPE)
1329 break;
1330
1331 /* test, if we can't store new data, because the stream */
1332 /* has not been started */
1333 if (runtime->state == SNDRV_PCM_STATE_PREPARED)
1334 return -EAGAIN;
1335 }
1336 return ret;
1337 }
1338
snd_pcm_oss_readv3(struct snd_pcm_substream * substream,void ** bufs,snd_pcm_uframes_t frames)1339 snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1340 {
1341 struct snd_pcm_runtime *runtime = substream->runtime;
1342 int ret;
1343 while (1) {
1344 if (runtime->state == SNDRV_PCM_STATE_XRUN ||
1345 runtime->state == SNDRV_PCM_STATE_SUSPENDED) {
1346 #ifdef OSS_DEBUG
1347 pcm_dbg(substream->pcm,
1348 "pcm_oss: readv: recovering from %s\n",
1349 runtime->state == SNDRV_PCM_STATE_XRUN ?
1350 "XRUN" : "SUSPEND");
1351 #endif
1352 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1353 if (ret < 0)
1354 break;
1355 } else if (runtime->state == SNDRV_PCM_STATE_SETUP) {
1356 ret = snd_pcm_oss_prepare(substream);
1357 if (ret < 0)
1358 break;
1359 }
1360 ret = snd_pcm_kernel_readv(substream, bufs, frames);
1361 if (ret != -EPIPE && ret != -ESTRPIPE)
1362 break;
1363 }
1364 return ret;
1365 }
1366 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
1367
snd_pcm_oss_write2(struct snd_pcm_substream * substream,const char * buf,size_t bytes,int in_kernel)1368 static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel)
1369 {
1370 struct snd_pcm_runtime *runtime = substream->runtime;
1371 snd_pcm_sframes_t frames, frames1;
1372 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1373 if (runtime->oss.plugin_first) {
1374 struct snd_pcm_plugin_channel *channels;
1375 size_t oss_frame_bytes = (runtime->oss.plugin_first->src_width * runtime->oss.plugin_first->src_format.channels) / 8;
1376 if (!in_kernel) {
1377 if (copy_from_user(runtime->oss.buffer, (const char __force __user *)buf, bytes))
1378 return -EFAULT;
1379 buf = runtime->oss.buffer;
1380 }
1381 frames = bytes / oss_frame_bytes;
1382 frames1 = snd_pcm_plug_client_channels_buf(substream, (char *)buf, frames, &channels);
1383 if (frames1 < 0)
1384 return frames1;
1385 frames1 = snd_pcm_plug_write_transfer(substream, channels, frames1);
1386 if (frames1 <= 0)
1387 return frames1;
1388 bytes = frames1 * oss_frame_bytes;
1389 } else
1390 #endif
1391 {
1392 frames = bytes_to_frames(runtime, bytes);
1393 frames1 = snd_pcm_oss_write3(substream, buf, frames, in_kernel);
1394 if (frames1 <= 0)
1395 return frames1;
1396 bytes = frames_to_bytes(runtime, frames1);
1397 }
1398 return bytes;
1399 }
1400
snd_pcm_oss_write1(struct snd_pcm_substream * substream,const char __user * buf,size_t bytes)1401 static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes)
1402 {
1403 size_t xfer = 0;
1404 ssize_t tmp = 0;
1405 struct snd_pcm_runtime *runtime = substream->runtime;
1406
1407 if (atomic_read(&substream->mmap_count))
1408 return -ENXIO;
1409
1410 atomic_inc(&runtime->oss.rw_ref);
1411 while (bytes > 0) {
1412 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1413 tmp = -ERESTARTSYS;
1414 break;
1415 }
1416 tmp = snd_pcm_oss_make_ready_locked(substream);
1417 if (tmp < 0)
1418 goto err;
1419 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1420 tmp = bytes;
1421 if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
1422 tmp = runtime->oss.period_bytes - runtime->oss.buffer_used;
1423 if (tmp > 0) {
1424 if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp)) {
1425 tmp = -EFAULT;
1426 goto err;
1427 }
1428 }
1429 runtime->oss.buffer_used += tmp;
1430 buf += tmp;
1431 bytes -= tmp;
1432 xfer += tmp;
1433 if (substream->oss.setup.partialfrag ||
1434 runtime->oss.buffer_used == runtime->oss.period_bytes) {
1435 tmp = snd_pcm_oss_write2(substream, runtime->oss.buffer + runtime->oss.period_ptr,
1436 runtime->oss.buffer_used - runtime->oss.period_ptr, 1);
1437 if (tmp <= 0)
1438 goto err;
1439 runtime->oss.bytes += tmp;
1440 runtime->oss.period_ptr += tmp;
1441 runtime->oss.period_ptr %= runtime->oss.period_bytes;
1442 if (runtime->oss.period_ptr == 0 ||
1443 runtime->oss.period_ptr == runtime->oss.buffer_used)
1444 runtime->oss.buffer_used = 0;
1445 else if ((substream->f_flags & O_NONBLOCK) != 0) {
1446 tmp = -EAGAIN;
1447 goto err;
1448 }
1449 }
1450 } else {
1451 tmp = snd_pcm_oss_write2(substream,
1452 (const char __force *)buf,
1453 runtime->oss.period_bytes, 0);
1454 if (tmp <= 0)
1455 goto err;
1456 runtime->oss.bytes += tmp;
1457 buf += tmp;
1458 bytes -= tmp;
1459 xfer += tmp;
1460 if ((substream->f_flags & O_NONBLOCK) != 0 &&
1461 tmp != runtime->oss.period_bytes)
1462 tmp = -EAGAIN;
1463 }
1464 err:
1465 mutex_unlock(&runtime->oss.params_lock);
1466 if (tmp < 0)
1467 break;
1468 if (signal_pending(current)) {
1469 tmp = -ERESTARTSYS;
1470 break;
1471 }
1472 tmp = 0;
1473 }
1474 atomic_dec(&runtime->oss.rw_ref);
1475 return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1476 }
1477
snd_pcm_oss_read2(struct snd_pcm_substream * substream,char * buf,size_t bytes,int in_kernel)1478 static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel)
1479 {
1480 struct snd_pcm_runtime *runtime = substream->runtime;
1481 snd_pcm_sframes_t frames, frames1;
1482 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1483 char __user *final_dst = (char __force __user *)buf;
1484 if (runtime->oss.plugin_first) {
1485 struct snd_pcm_plugin_channel *channels;
1486 size_t oss_frame_bytes = (runtime->oss.plugin_last->dst_width * runtime->oss.plugin_last->dst_format.channels) / 8;
1487 if (!in_kernel)
1488 buf = runtime->oss.buffer;
1489 frames = bytes / oss_frame_bytes;
1490 frames1 = snd_pcm_plug_client_channels_buf(substream, buf, frames, &channels);
1491 if (frames1 < 0)
1492 return frames1;
1493 frames1 = snd_pcm_plug_read_transfer(substream, channels, frames1);
1494 if (frames1 <= 0)
1495 return frames1;
1496 bytes = frames1 * oss_frame_bytes;
1497 if (!in_kernel && copy_to_user(final_dst, buf, bytes))
1498 return -EFAULT;
1499 } else
1500 #endif
1501 {
1502 frames = bytes_to_frames(runtime, bytes);
1503 frames1 = snd_pcm_oss_read3(substream, buf, frames, in_kernel);
1504 if (frames1 <= 0)
1505 return frames1;
1506 bytes = frames_to_bytes(runtime, frames1);
1507 }
1508 return bytes;
1509 }
1510
snd_pcm_oss_read1(struct snd_pcm_substream * substream,char __user * buf,size_t bytes)1511 static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes)
1512 {
1513 size_t xfer = 0;
1514 ssize_t tmp = 0;
1515 struct snd_pcm_runtime *runtime = substream->runtime;
1516
1517 if (atomic_read(&substream->mmap_count))
1518 return -ENXIO;
1519
1520 atomic_inc(&runtime->oss.rw_ref);
1521 while (bytes > 0) {
1522 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1523 tmp = -ERESTARTSYS;
1524 break;
1525 }
1526 tmp = snd_pcm_oss_make_ready_locked(substream);
1527 if (tmp < 0)
1528 goto err;
1529 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1530 if (runtime->oss.buffer_used == 0) {
1531 tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1);
1532 if (tmp <= 0)
1533 goto err;
1534 runtime->oss.bytes += tmp;
1535 runtime->oss.period_ptr = tmp;
1536 runtime->oss.buffer_used = tmp;
1537 }
1538 tmp = bytes;
1539 if ((size_t) tmp > runtime->oss.buffer_used)
1540 tmp = runtime->oss.buffer_used;
1541 if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp)) {
1542 tmp = -EFAULT;
1543 goto err;
1544 }
1545 buf += tmp;
1546 bytes -= tmp;
1547 xfer += tmp;
1548 runtime->oss.buffer_used -= tmp;
1549 } else {
1550 tmp = snd_pcm_oss_read2(substream, (char __force *)buf,
1551 runtime->oss.period_bytes, 0);
1552 if (tmp <= 0)
1553 goto err;
1554 runtime->oss.bytes += tmp;
1555 buf += tmp;
1556 bytes -= tmp;
1557 xfer += tmp;
1558 }
1559 err:
1560 mutex_unlock(&runtime->oss.params_lock);
1561 if (tmp < 0)
1562 break;
1563 if (signal_pending(current)) {
1564 tmp = -ERESTARTSYS;
1565 break;
1566 }
1567 tmp = 0;
1568 }
1569 atomic_dec(&runtime->oss.rw_ref);
1570 return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1571 }
1572
snd_pcm_oss_reset(struct snd_pcm_oss_file * pcm_oss_file)1573 static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
1574 {
1575 struct snd_pcm_substream *substream;
1576 struct snd_pcm_runtime *runtime;
1577 int i;
1578
1579 for (i = 0; i < 2; i++) {
1580 substream = pcm_oss_file->streams[i];
1581 if (!substream)
1582 continue;
1583 runtime = substream->runtime;
1584 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1585 mutex_lock(&runtime->oss.params_lock);
1586 runtime->oss.prepare = 1;
1587 runtime->oss.buffer_used = 0;
1588 runtime->oss.prev_hw_ptr_period = 0;
1589 runtime->oss.period_ptr = 0;
1590 mutex_unlock(&runtime->oss.params_lock);
1591 }
1592 return 0;
1593 }
1594
snd_pcm_oss_post(struct snd_pcm_oss_file * pcm_oss_file)1595 static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file)
1596 {
1597 struct snd_pcm_substream *substream;
1598 int err;
1599
1600 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1601 if (substream != NULL) {
1602 err = snd_pcm_oss_make_ready(substream);
1603 if (err < 0)
1604 return err;
1605 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL);
1606 }
1607 /* note: all errors from the start action are ignored */
1608 /* OSS apps do not know, how to handle them */
1609 return 0;
1610 }
1611
snd_pcm_oss_sync1(struct snd_pcm_substream * substream,size_t size)1612 static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size)
1613 {
1614 struct snd_pcm_runtime *runtime;
1615 ssize_t result = 0;
1616 snd_pcm_state_t state;
1617 long res;
1618 wait_queue_entry_t wait;
1619
1620 runtime = substream->runtime;
1621 init_waitqueue_entry(&wait, current);
1622 add_wait_queue(&runtime->sleep, &wait);
1623 #ifdef OSS_DEBUG
1624 pcm_dbg(substream->pcm, "sync1: size = %li\n", size);
1625 #endif
1626 while (1) {
1627 result = snd_pcm_oss_write2(substream, runtime->oss.buffer, size, 1);
1628 if (result > 0) {
1629 runtime->oss.buffer_used = 0;
1630 result = 0;
1631 break;
1632 }
1633 if (result != 0 && result != -EAGAIN)
1634 break;
1635 result = 0;
1636 set_current_state(TASK_INTERRUPTIBLE);
1637 snd_pcm_stream_lock_irq(substream);
1638 state = runtime->state;
1639 snd_pcm_stream_unlock_irq(substream);
1640 if (state != SNDRV_PCM_STATE_RUNNING) {
1641 set_current_state(TASK_RUNNING);
1642 break;
1643 }
1644 res = schedule_timeout(10 * HZ);
1645 if (signal_pending(current)) {
1646 result = -ERESTARTSYS;
1647 break;
1648 }
1649 if (res == 0) {
1650 pcm_err(substream->pcm,
1651 "OSS sync error - DMA timeout\n");
1652 result = -EIO;
1653 break;
1654 }
1655 }
1656 remove_wait_queue(&runtime->sleep, &wait);
1657 return result;
1658 }
1659
snd_pcm_oss_sync(struct snd_pcm_oss_file * pcm_oss_file)1660 static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
1661 {
1662 int err = 0;
1663 unsigned int saved_f_flags;
1664 struct snd_pcm_substream *substream;
1665 struct snd_pcm_runtime *runtime;
1666 snd_pcm_format_t format;
1667 unsigned long width;
1668 size_t size;
1669
1670 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1671 if (substream != NULL) {
1672 runtime = substream->runtime;
1673 if (atomic_read(&substream->mmap_count))
1674 goto __direct;
1675 atomic_inc(&runtime->oss.rw_ref);
1676 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1677 atomic_dec(&runtime->oss.rw_ref);
1678 return -ERESTARTSYS;
1679 }
1680 err = snd_pcm_oss_make_ready_locked(substream);
1681 if (err < 0)
1682 goto unlock;
1683 format = snd_pcm_oss_format_from(runtime->oss.format);
1684 width = snd_pcm_format_physical_width(format);
1685 if (runtime->oss.buffer_used > 0) {
1686 #ifdef OSS_DEBUG
1687 pcm_dbg(substream->pcm, "sync: buffer_used\n");
1688 #endif
1689 size = (8 * (runtime->oss.period_bytes - runtime->oss.buffer_used) + 7) / width;
1690 snd_pcm_format_set_silence(format,
1691 runtime->oss.buffer + runtime->oss.buffer_used,
1692 size);
1693 err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes);
1694 if (err < 0)
1695 goto unlock;
1696 } else if (runtime->oss.period_ptr > 0) {
1697 #ifdef OSS_DEBUG
1698 pcm_dbg(substream->pcm, "sync: period_ptr\n");
1699 #endif
1700 size = runtime->oss.period_bytes - runtime->oss.period_ptr;
1701 snd_pcm_format_set_silence(format,
1702 runtime->oss.buffer,
1703 size * 8 / width);
1704 err = snd_pcm_oss_sync1(substream, size);
1705 if (err < 0)
1706 goto unlock;
1707 }
1708 /*
1709 * The ALSA's period might be a bit large than OSS one.
1710 * Fill the remain portion of ALSA period with zeros.
1711 */
1712 size = runtime->control->appl_ptr % runtime->period_size;
1713 if (size > 0) {
1714 size = runtime->period_size - size;
1715 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED)
1716 snd_pcm_lib_write(substream, NULL, size);
1717 else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1718 snd_pcm_lib_writev(substream, NULL, size);
1719 }
1720 unlock:
1721 mutex_unlock(&runtime->oss.params_lock);
1722 atomic_dec(&runtime->oss.rw_ref);
1723 if (err < 0)
1724 return err;
1725 /*
1726 * finish sync: drain the buffer
1727 */
1728 __direct:
1729 saved_f_flags = substream->f_flags;
1730 substream->f_flags &= ~O_NONBLOCK;
1731 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1732 substream->f_flags = saved_f_flags;
1733 if (err < 0)
1734 return err;
1735 mutex_lock(&runtime->oss.params_lock);
1736 runtime->oss.prepare = 1;
1737 mutex_unlock(&runtime->oss.params_lock);
1738 }
1739
1740 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
1741 if (substream != NULL) {
1742 err = snd_pcm_oss_make_ready(substream);
1743 if (err < 0)
1744 return err;
1745 runtime = substream->runtime;
1746 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1747 if (err < 0)
1748 return err;
1749 mutex_lock(&runtime->oss.params_lock);
1750 runtime->oss.buffer_used = 0;
1751 runtime->oss.prepare = 1;
1752 mutex_unlock(&runtime->oss.params_lock);
1753 }
1754 return 0;
1755 }
1756
snd_pcm_oss_set_rate(struct snd_pcm_oss_file * pcm_oss_file,int rate)1757 static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)
1758 {
1759 int idx;
1760
1761 for (idx = 1; idx >= 0; --idx) {
1762 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1763 struct snd_pcm_runtime *runtime;
1764 int err;
1765
1766 if (substream == NULL)
1767 continue;
1768 runtime = substream->runtime;
1769 if (rate < 1000)
1770 rate = 1000;
1771 else if (rate > 192000)
1772 rate = 192000;
1773 err = lock_params(runtime);
1774 if (err < 0)
1775 return err;
1776 if (runtime->oss.rate != rate) {
1777 runtime->oss.params = 1;
1778 runtime->oss.rate = rate;
1779 }
1780 unlock_params(runtime);
1781 }
1782 return snd_pcm_oss_get_rate(pcm_oss_file);
1783 }
1784
snd_pcm_oss_get_rate(struct snd_pcm_oss_file * pcm_oss_file)1785 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file)
1786 {
1787 struct snd_pcm_substream *substream;
1788 int err;
1789
1790 err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1791 if (err < 0)
1792 return err;
1793 return substream->runtime->oss.rate;
1794 }
1795
snd_pcm_oss_set_channels(struct snd_pcm_oss_file * pcm_oss_file,unsigned int channels)1796 static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels)
1797 {
1798 int idx;
1799 if (channels < 1)
1800 channels = 1;
1801 if (channels > 128)
1802 return -EINVAL;
1803 for (idx = 1; idx >= 0; --idx) {
1804 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1805 struct snd_pcm_runtime *runtime;
1806 int err;
1807
1808 if (substream == NULL)
1809 continue;
1810 runtime = substream->runtime;
1811 err = lock_params(runtime);
1812 if (err < 0)
1813 return err;
1814 if (runtime->oss.channels != channels) {
1815 runtime->oss.params = 1;
1816 runtime->oss.channels = channels;
1817 }
1818 unlock_params(runtime);
1819 }
1820 return snd_pcm_oss_get_channels(pcm_oss_file);
1821 }
1822
snd_pcm_oss_get_channels(struct snd_pcm_oss_file * pcm_oss_file)1823 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file)
1824 {
1825 struct snd_pcm_substream *substream;
1826 int err;
1827
1828 err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1829 if (err < 0)
1830 return err;
1831 return substream->runtime->oss.channels;
1832 }
1833
snd_pcm_oss_get_block_size(struct snd_pcm_oss_file * pcm_oss_file)1834 static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file)
1835 {
1836 struct snd_pcm_substream *substream;
1837 int err;
1838
1839 err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1840 if (err < 0)
1841 return err;
1842 return substream->runtime->oss.period_bytes;
1843 }
1844
snd_pcm_oss_get_formats(struct snd_pcm_oss_file * pcm_oss_file)1845 static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file)
1846 {
1847 struct snd_pcm_substream *substream;
1848 int err;
1849 int direct;
1850 struct snd_pcm_hw_params *params;
1851 unsigned int formats = 0;
1852 const struct snd_mask *format_mask;
1853 int fmt;
1854
1855 err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1856 if (err < 0)
1857 return err;
1858 if (atomic_read(&substream->mmap_count))
1859 direct = 1;
1860 else
1861 direct = substream->oss.setup.direct;
1862 if (!direct)
1863 return AFMT_MU_LAW | AFMT_U8 |
1864 AFMT_S16_LE | AFMT_S16_BE |
1865 AFMT_S8 | AFMT_U16_LE |
1866 AFMT_U16_BE |
1867 AFMT_S32_LE | AFMT_S32_BE |
1868 AFMT_S24_LE | AFMT_S24_BE |
1869 AFMT_S24_PACKED;
1870 params = kmalloc(sizeof(*params), GFP_KERNEL);
1871 if (!params)
1872 return -ENOMEM;
1873 _snd_pcm_hw_params_any(params);
1874 err = snd_pcm_hw_refine(substream, params);
1875 if (err < 0)
1876 goto error;
1877 format_mask = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
1878 for (fmt = 0; fmt < 32; ++fmt) {
1879 if (snd_mask_test(format_mask, fmt)) {
1880 int f = snd_pcm_oss_format_to((__force snd_pcm_format_t)fmt);
1881 if (f >= 0)
1882 formats |= f;
1883 }
1884 }
1885
1886 error:
1887 kfree(params);
1888 return err < 0 ? err : formats;
1889 }
1890
snd_pcm_oss_set_format(struct snd_pcm_oss_file * pcm_oss_file,int format)1891 static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format)
1892 {
1893 int formats, idx;
1894 int err;
1895
1896 if (format != AFMT_QUERY) {
1897 formats = snd_pcm_oss_get_formats(pcm_oss_file);
1898 if (formats < 0)
1899 return formats;
1900 if (!(formats & format))
1901 format = AFMT_U8;
1902 for (idx = 1; idx >= 0; --idx) {
1903 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1904 struct snd_pcm_runtime *runtime;
1905 if (substream == NULL)
1906 continue;
1907 runtime = substream->runtime;
1908 err = lock_params(runtime);
1909 if (err < 0)
1910 return err;
1911 if (runtime->oss.format != format) {
1912 runtime->oss.params = 1;
1913 runtime->oss.format = format;
1914 }
1915 unlock_params(runtime);
1916 }
1917 }
1918 return snd_pcm_oss_get_format(pcm_oss_file);
1919 }
1920
snd_pcm_oss_get_format(struct snd_pcm_oss_file * pcm_oss_file)1921 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file)
1922 {
1923 struct snd_pcm_substream *substream;
1924 int err;
1925
1926 err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1927 if (err < 0)
1928 return err;
1929 return substream->runtime->oss.format;
1930 }
1931
snd_pcm_oss_set_subdivide1(struct snd_pcm_substream * substream,int subdivide)1932 static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide)
1933 {
1934 struct snd_pcm_runtime *runtime;
1935
1936 runtime = substream->runtime;
1937 if (subdivide == 0) {
1938 subdivide = runtime->oss.subdivision;
1939 if (subdivide == 0)
1940 subdivide = 1;
1941 return subdivide;
1942 }
1943 if (runtime->oss.subdivision || runtime->oss.fragshift)
1944 return -EINVAL;
1945 if (subdivide != 1 && subdivide != 2 && subdivide != 4 &&
1946 subdivide != 8 && subdivide != 16)
1947 return -EINVAL;
1948 runtime->oss.subdivision = subdivide;
1949 runtime->oss.params = 1;
1950 return subdivide;
1951 }
1952
snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file * pcm_oss_file,int subdivide)1953 static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide)
1954 {
1955 int err = -EINVAL, idx;
1956
1957 for (idx = 1; idx >= 0; --idx) {
1958 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1959 struct snd_pcm_runtime *runtime;
1960
1961 if (substream == NULL)
1962 continue;
1963 runtime = substream->runtime;
1964 err = lock_params(runtime);
1965 if (err < 0)
1966 return err;
1967 err = snd_pcm_oss_set_subdivide1(substream, subdivide);
1968 unlock_params(runtime);
1969 if (err < 0)
1970 return err;
1971 }
1972 return err;
1973 }
1974
snd_pcm_oss_set_fragment1(struct snd_pcm_substream * substream,unsigned int val)1975 static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val)
1976 {
1977 struct snd_pcm_runtime *runtime;
1978 int fragshift;
1979
1980 runtime = substream->runtime;
1981 if (runtime->oss.subdivision || runtime->oss.fragshift)
1982 return -EINVAL;
1983 fragshift = val & 0xffff;
1984 if (fragshift >= 25) /* should be large enough */
1985 return -EINVAL;
1986 runtime->oss.fragshift = fragshift;
1987 runtime->oss.maxfrags = (val >> 16) & 0xffff;
1988 if (runtime->oss.fragshift < 4) /* < 16 */
1989 runtime->oss.fragshift = 4;
1990 if (runtime->oss.maxfrags < 2)
1991 runtime->oss.maxfrags = 2;
1992 runtime->oss.params = 1;
1993 return 0;
1994 }
1995
snd_pcm_oss_set_fragment(struct snd_pcm_oss_file * pcm_oss_file,unsigned int val)1996 static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val)
1997 {
1998 int err = -EINVAL, idx;
1999
2000 for (idx = 1; idx >= 0; --idx) {
2001 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
2002 struct snd_pcm_runtime *runtime;
2003
2004 if (substream == NULL)
2005 continue;
2006 runtime = substream->runtime;
2007 err = lock_params(runtime);
2008 if (err < 0)
2009 return err;
2010 err = snd_pcm_oss_set_fragment1(substream, val);
2011 unlock_params(runtime);
2012 if (err < 0)
2013 return err;
2014 }
2015 return err;
2016 }
2017
snd_pcm_oss_nonblock(struct file * file)2018 static int snd_pcm_oss_nonblock(struct file * file)
2019 {
2020 spin_lock(&file->f_lock);
2021 file->f_flags |= O_NONBLOCK;
2022 spin_unlock(&file->f_lock);
2023 return 0;
2024 }
2025
snd_pcm_oss_get_caps1(struct snd_pcm_substream * substream,int res)2026 static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res)
2027 {
2028
2029 if (substream == NULL) {
2030 res &= ~DSP_CAP_DUPLEX;
2031 return res;
2032 }
2033 #ifdef DSP_CAP_MULTI
2034 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2035 if (substream->pstr->substream_count > 1)
2036 res |= DSP_CAP_MULTI;
2037 #endif
2038 /* DSP_CAP_REALTIME is set all times: */
2039 /* all ALSA drivers can return actual pointer in ring buffer */
2040 #if defined(DSP_CAP_REALTIME) && 0
2041 {
2042 struct snd_pcm_runtime *runtime = substream->runtime;
2043 if (runtime->info & (SNDRV_PCM_INFO_BLOCK_TRANSFER|SNDRV_PCM_INFO_BATCH))
2044 res &= ~DSP_CAP_REALTIME;
2045 }
2046 #endif
2047 return res;
2048 }
2049
snd_pcm_oss_get_caps(struct snd_pcm_oss_file * pcm_oss_file)2050 static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)
2051 {
2052 int result, idx;
2053
2054 result = DSP_CAP_TRIGGER | DSP_CAP_MMAP | DSP_CAP_DUPLEX | DSP_CAP_REALTIME;
2055 for (idx = 0; idx < 2; idx++) {
2056 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
2057 result = snd_pcm_oss_get_caps1(substream, result);
2058 }
2059 result |= 0x0001; /* revision - same as SB AWE 64 */
2060 return result;
2061 }
2062
snd_pcm_oss_simulate_fill(struct snd_pcm_substream * substream,snd_pcm_uframes_t hw_ptr)2063 static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
2064 snd_pcm_uframes_t hw_ptr)
2065 {
2066 struct snd_pcm_runtime *runtime = substream->runtime;
2067 snd_pcm_uframes_t appl_ptr;
2068 appl_ptr = hw_ptr + runtime->buffer_size;
2069 appl_ptr %= runtime->boundary;
2070 runtime->control->appl_ptr = appl_ptr;
2071 }
2072
snd_pcm_oss_set_trigger(struct snd_pcm_oss_file * pcm_oss_file,int trigger)2073 static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger)
2074 {
2075 struct snd_pcm_runtime *runtime;
2076 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2077 int err, cmd;
2078
2079 #ifdef OSS_DEBUG
2080 pr_debug("pcm_oss: trigger = 0x%x\n", trigger);
2081 #endif
2082
2083 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2084 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2085
2086 if (psubstream) {
2087 err = snd_pcm_oss_make_ready(psubstream);
2088 if (err < 0)
2089 return err;
2090 }
2091 if (csubstream) {
2092 err = snd_pcm_oss_make_ready(csubstream);
2093 if (err < 0)
2094 return err;
2095 }
2096 if (psubstream) {
2097 runtime = psubstream->runtime;
2098 cmd = 0;
2099 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2100 return -ERESTARTSYS;
2101 if (trigger & PCM_ENABLE_OUTPUT) {
2102 if (runtime->oss.trigger)
2103 goto _skip1;
2104 if (atomic_read(&psubstream->mmap_count))
2105 snd_pcm_oss_simulate_fill(psubstream,
2106 get_hw_ptr_period(runtime));
2107 runtime->oss.trigger = 1;
2108 runtime->start_threshold = 1;
2109 cmd = SNDRV_PCM_IOCTL_START;
2110 } else {
2111 if (!runtime->oss.trigger)
2112 goto _skip1;
2113 runtime->oss.trigger = 0;
2114 runtime->start_threshold = runtime->boundary;
2115 cmd = SNDRV_PCM_IOCTL_DROP;
2116 runtime->oss.prepare = 1;
2117 }
2118 _skip1:
2119 mutex_unlock(&runtime->oss.params_lock);
2120 if (cmd) {
2121 err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL);
2122 if (err < 0)
2123 return err;
2124 }
2125 }
2126 if (csubstream) {
2127 runtime = csubstream->runtime;
2128 cmd = 0;
2129 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2130 return -ERESTARTSYS;
2131 if (trigger & PCM_ENABLE_INPUT) {
2132 if (runtime->oss.trigger)
2133 goto _skip2;
2134 runtime->oss.trigger = 1;
2135 runtime->start_threshold = 1;
2136 cmd = SNDRV_PCM_IOCTL_START;
2137 } else {
2138 if (!runtime->oss.trigger)
2139 goto _skip2;
2140 runtime->oss.trigger = 0;
2141 runtime->start_threshold = runtime->boundary;
2142 cmd = SNDRV_PCM_IOCTL_DROP;
2143 runtime->oss.prepare = 1;
2144 }
2145 _skip2:
2146 mutex_unlock(&runtime->oss.params_lock);
2147 if (cmd) {
2148 err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL);
2149 if (err < 0)
2150 return err;
2151 }
2152 }
2153 return 0;
2154 }
2155
snd_pcm_oss_get_trigger(struct snd_pcm_oss_file * pcm_oss_file)2156 static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file)
2157 {
2158 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2159 int result = 0;
2160
2161 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2162 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2163 if (psubstream && psubstream->runtime && psubstream->runtime->oss.trigger)
2164 result |= PCM_ENABLE_OUTPUT;
2165 if (csubstream && csubstream->runtime && csubstream->runtime->oss.trigger)
2166 result |= PCM_ENABLE_INPUT;
2167 return result;
2168 }
2169
snd_pcm_oss_get_odelay(struct snd_pcm_oss_file * pcm_oss_file)2170 static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file)
2171 {
2172 struct snd_pcm_substream *substream;
2173 struct snd_pcm_runtime *runtime;
2174 snd_pcm_sframes_t delay;
2175 int err;
2176
2177 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2178 if (substream == NULL)
2179 return -EINVAL;
2180 err = snd_pcm_oss_make_ready(substream);
2181 if (err < 0)
2182 return err;
2183 runtime = substream->runtime;
2184 if (runtime->oss.params || runtime->oss.prepare)
2185 return 0;
2186 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2187 if (err == -EPIPE)
2188 delay = 0; /* hack for broken OSS applications */
2189 else if (err < 0)
2190 return err;
2191 return snd_pcm_oss_bytes(substream, delay);
2192 }
2193
snd_pcm_oss_get_ptr(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct count_info __user * _info)2194 static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info)
2195 {
2196 struct snd_pcm_substream *substream;
2197 struct snd_pcm_runtime *runtime;
2198 snd_pcm_sframes_t delay;
2199 int fixup;
2200 struct count_info info;
2201 int err;
2202
2203 if (_info == NULL)
2204 return -EFAULT;
2205 substream = pcm_oss_file->streams[stream];
2206 if (substream == NULL)
2207 return -EINVAL;
2208 err = snd_pcm_oss_make_ready(substream);
2209 if (err < 0)
2210 return err;
2211 runtime = substream->runtime;
2212 if (runtime->oss.params || runtime->oss.prepare) {
2213 memset(&info, 0, sizeof(info));
2214 if (copy_to_user(_info, &info, sizeof(info)))
2215 return -EFAULT;
2216 return 0;
2217 }
2218 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2219 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2220 if (err == -EPIPE || err == -ESTRPIPE || (! err && delay < 0)) {
2221 err = 0;
2222 delay = 0;
2223 fixup = 0;
2224 } else {
2225 fixup = runtime->oss.buffer_used;
2226 }
2227 } else {
2228 err = snd_pcm_oss_capture_position_fixup(substream, &delay);
2229 fixup = -runtime->oss.buffer_used;
2230 }
2231 if (err < 0)
2232 return err;
2233 info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size);
2234 if (atomic_read(&substream->mmap_count)) {
2235 snd_pcm_sframes_t n;
2236 delay = get_hw_ptr_period(runtime);
2237 n = delay - runtime->oss.prev_hw_ptr_period;
2238 if (n < 0)
2239 n += runtime->boundary;
2240 info.blocks = n / runtime->period_size;
2241 runtime->oss.prev_hw_ptr_period = delay;
2242 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2243 snd_pcm_oss_simulate_fill(substream, delay);
2244 info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
2245 } else {
2246 delay = snd_pcm_oss_bytes(substream, delay);
2247 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2248 if (substream->oss.setup.buggyptr)
2249 info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
2250 else
2251 info.blocks = (delay + fixup) / runtime->oss.period_bytes;
2252 info.bytes = (runtime->oss.bytes - delay) & INT_MAX;
2253 } else {
2254 delay += fixup;
2255 info.blocks = delay / runtime->oss.period_bytes;
2256 info.bytes = (runtime->oss.bytes + delay) & INT_MAX;
2257 }
2258 }
2259 if (copy_to_user(_info, &info, sizeof(info)))
2260 return -EFAULT;
2261 return 0;
2262 }
2263
snd_pcm_oss_get_space(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct audio_buf_info __user * _info)2264 static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info)
2265 {
2266 struct snd_pcm_substream *substream;
2267 struct snd_pcm_runtime *runtime;
2268 snd_pcm_sframes_t avail;
2269 int fixup;
2270 struct audio_buf_info info;
2271 int err;
2272
2273 if (_info == NULL)
2274 return -EFAULT;
2275 substream = pcm_oss_file->streams[stream];
2276 if (substream == NULL)
2277 return -EINVAL;
2278 runtime = substream->runtime;
2279
2280 if (runtime->oss.params) {
2281 err = snd_pcm_oss_change_params(substream, false);
2282 if (err < 0)
2283 return err;
2284 }
2285
2286 info.fragsize = runtime->oss.period_bytes;
2287 info.fragstotal = runtime->periods;
2288 if (runtime->oss.prepare) {
2289 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2290 info.bytes = runtime->oss.period_bytes * runtime->oss.periods;
2291 info.fragments = runtime->oss.periods;
2292 } else {
2293 info.bytes = 0;
2294 info.fragments = 0;
2295 }
2296 } else {
2297 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2298 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &avail);
2299 if (err == -EPIPE || err == -ESTRPIPE || (! err && avail < 0)) {
2300 avail = runtime->buffer_size;
2301 err = 0;
2302 fixup = 0;
2303 } else {
2304 avail = runtime->buffer_size - avail;
2305 fixup = -runtime->oss.buffer_used;
2306 }
2307 } else {
2308 err = snd_pcm_oss_capture_position_fixup(substream, &avail);
2309 fixup = runtime->oss.buffer_used;
2310 }
2311 if (err < 0)
2312 return err;
2313 info.bytes = snd_pcm_oss_bytes(substream, avail) + fixup;
2314 info.fragments = info.bytes / runtime->oss.period_bytes;
2315 }
2316
2317 #ifdef OSS_DEBUG
2318 pcm_dbg(substream->pcm,
2319 "pcm_oss: space: bytes = %i, fragments = %i, fragstotal = %i, fragsize = %i\n",
2320 info.bytes, info.fragments, info.fragstotal, info.fragsize);
2321 #endif
2322 if (copy_to_user(_info, &info, sizeof(info)))
2323 return -EFAULT;
2324 return 0;
2325 }
2326
snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct buffmem_desc __user * _info)2327 static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info)
2328 {
2329 // it won't be probably implemented
2330 // pr_debug("TODO: snd_pcm_oss_get_mapbuf\n");
2331 return -EINVAL;
2332 }
2333
strip_task_path(const char * path)2334 static const char *strip_task_path(const char *path)
2335 {
2336 const char *ptr, *ptrl = NULL;
2337 for (ptr = path; *ptr; ptr++) {
2338 if (*ptr == '/')
2339 ptrl = ptr + 1;
2340 }
2341 return ptrl;
2342 }
2343
snd_pcm_oss_look_for_setup(struct snd_pcm * pcm,int stream,const char * task_name,struct snd_pcm_oss_setup * rsetup)2344 static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
2345 const char *task_name,
2346 struct snd_pcm_oss_setup *rsetup)
2347 {
2348 struct snd_pcm_oss_setup *setup;
2349
2350 mutex_lock(&pcm->streams[stream].oss.setup_mutex);
2351 do {
2352 for (setup = pcm->streams[stream].oss.setup_list; setup;
2353 setup = setup->next) {
2354 if (!strcmp(setup->task_name, task_name))
2355 goto out;
2356 }
2357 } while ((task_name = strip_task_path(task_name)) != NULL);
2358 out:
2359 if (setup)
2360 *rsetup = *setup;
2361 mutex_unlock(&pcm->streams[stream].oss.setup_mutex);
2362 }
2363
snd_pcm_oss_release_substream(struct snd_pcm_substream * substream)2364 static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream)
2365 {
2366 snd_pcm_oss_release_buffers(substream);
2367 substream->oss.oss = 0;
2368 }
2369
snd_pcm_oss_init_substream(struct snd_pcm_substream * substream,struct snd_pcm_oss_setup * setup,int minor)2370 static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
2371 struct snd_pcm_oss_setup *setup,
2372 int minor)
2373 {
2374 struct snd_pcm_runtime *runtime;
2375
2376 substream->oss.oss = 1;
2377 substream->oss.setup = *setup;
2378 if (setup->nonblock)
2379 substream->f_flags |= O_NONBLOCK;
2380 else if (setup->block)
2381 substream->f_flags &= ~O_NONBLOCK;
2382 runtime = substream->runtime;
2383 runtime->oss.params = 1;
2384 runtime->oss.trigger = 1;
2385 runtime->oss.rate = 8000;
2386 mutex_init(&runtime->oss.params_lock);
2387 switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
2388 case SNDRV_MINOR_OSS_PCM_8:
2389 runtime->oss.format = AFMT_U8;
2390 break;
2391 case SNDRV_MINOR_OSS_PCM_16:
2392 runtime->oss.format = AFMT_S16_LE;
2393 break;
2394 default:
2395 runtime->oss.format = AFMT_MU_LAW;
2396 }
2397 runtime->oss.channels = 1;
2398 runtime->oss.fragshift = 0;
2399 runtime->oss.maxfrags = 0;
2400 runtime->oss.subdivision = 0;
2401 substream->pcm_release = snd_pcm_oss_release_substream;
2402 atomic_set(&runtime->oss.rw_ref, 0);
2403 }
2404
snd_pcm_oss_release_file(struct snd_pcm_oss_file * pcm_oss_file)2405 static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file)
2406 {
2407 int cidx;
2408 if (!pcm_oss_file)
2409 return 0;
2410 for (cidx = 0; cidx < 2; ++cidx) {
2411 struct snd_pcm_substream *substream = pcm_oss_file->streams[cidx];
2412 if (substream)
2413 snd_pcm_release_substream(substream);
2414 }
2415 kfree(pcm_oss_file);
2416 return 0;
2417 }
2418
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)2419 static int snd_pcm_oss_open_file(struct file *file,
2420 struct snd_pcm *pcm,
2421 struct snd_pcm_oss_file **rpcm_oss_file,
2422 int minor,
2423 struct snd_pcm_oss_setup *setup)
2424 {
2425 int idx, err;
2426 struct snd_pcm_oss_file *pcm_oss_file;
2427 struct snd_pcm_substream *substream;
2428 fmode_t f_mode = file->f_mode;
2429
2430 if (rpcm_oss_file)
2431 *rpcm_oss_file = NULL;
2432
2433 pcm_oss_file = kzalloc(sizeof(*pcm_oss_file), GFP_KERNEL);
2434 if (pcm_oss_file == NULL)
2435 return -ENOMEM;
2436
2437 if ((f_mode & (FMODE_WRITE|FMODE_READ)) == (FMODE_WRITE|FMODE_READ) &&
2438 (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX))
2439 f_mode = FMODE_WRITE;
2440
2441 file->f_flags &= ~O_APPEND;
2442 for (idx = 0; idx < 2; idx++) {
2443 if (setup[idx].disable)
2444 continue;
2445 if (! pcm->streams[idx].substream_count)
2446 continue; /* no matching substream */
2447 if (idx == SNDRV_PCM_STREAM_PLAYBACK) {
2448 if (! (f_mode & FMODE_WRITE))
2449 continue;
2450 } else {
2451 if (! (f_mode & FMODE_READ))
2452 continue;
2453 }
2454 err = snd_pcm_open_substream(pcm, idx, file, &substream);
2455 if (err < 0) {
2456 snd_pcm_oss_release_file(pcm_oss_file);
2457 return err;
2458 }
2459
2460 pcm_oss_file->streams[idx] = substream;
2461 snd_pcm_oss_init_substream(substream, &setup[idx], minor);
2462 }
2463
2464 if (!pcm_oss_file->streams[0] && !pcm_oss_file->streams[1]) {
2465 snd_pcm_oss_release_file(pcm_oss_file);
2466 return -EINVAL;
2467 }
2468
2469 file->private_data = pcm_oss_file;
2470 if (rpcm_oss_file)
2471 *rpcm_oss_file = pcm_oss_file;
2472 return 0;
2473 }
2474
2475
snd_task_name(struct task_struct * task,char * name,size_t size)2476 static int snd_task_name(struct task_struct *task, char *name, size_t size)
2477 {
2478 unsigned int idx;
2479
2480 if (snd_BUG_ON(!task || !name || size < 2))
2481 return -EINVAL;
2482 for (idx = 0; idx < sizeof(task->comm) && idx + 1 < size; idx++)
2483 name[idx] = task->comm[idx];
2484 name[idx] = '\0';
2485 return 0;
2486 }
2487
snd_pcm_oss_open(struct inode * inode,struct file * file)2488 static int snd_pcm_oss_open(struct inode *inode, struct file *file)
2489 {
2490 int err;
2491 char task_name[32];
2492 struct snd_pcm *pcm;
2493 struct snd_pcm_oss_file *pcm_oss_file;
2494 struct snd_pcm_oss_setup setup[2];
2495 int nonblock;
2496 wait_queue_entry_t wait;
2497
2498 err = nonseekable_open(inode, file);
2499 if (err < 0)
2500 return err;
2501
2502 pcm = snd_lookup_oss_minor_data(iminor(inode),
2503 SNDRV_OSS_DEVICE_TYPE_PCM);
2504 if (pcm == NULL) {
2505 err = -ENODEV;
2506 goto __error1;
2507 }
2508 err = snd_card_file_add(pcm->card, file);
2509 if (err < 0)
2510 goto __error1;
2511 if (!try_module_get(pcm->card->module)) {
2512 err = -EFAULT;
2513 goto __error2;
2514 }
2515 if (snd_task_name(current, task_name, sizeof(task_name)) < 0) {
2516 err = -EFAULT;
2517 goto __error;
2518 }
2519 memset(setup, 0, sizeof(setup));
2520 if (file->f_mode & FMODE_WRITE)
2521 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_PLAYBACK,
2522 task_name, &setup[0]);
2523 if (file->f_mode & FMODE_READ)
2524 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_CAPTURE,
2525 task_name, &setup[1]);
2526
2527 nonblock = !!(file->f_flags & O_NONBLOCK);
2528 if (!nonblock)
2529 nonblock = nonblock_open;
2530
2531 init_waitqueue_entry(&wait, current);
2532 add_wait_queue(&pcm->open_wait, &wait);
2533 mutex_lock(&pcm->open_mutex);
2534 while (1) {
2535 err = snd_pcm_oss_open_file(file, pcm, &pcm_oss_file,
2536 iminor(inode), setup);
2537 if (err >= 0)
2538 break;
2539 if (err == -EAGAIN) {
2540 if (nonblock) {
2541 err = -EBUSY;
2542 break;
2543 }
2544 } else
2545 break;
2546 set_current_state(TASK_INTERRUPTIBLE);
2547 mutex_unlock(&pcm->open_mutex);
2548 schedule();
2549 mutex_lock(&pcm->open_mutex);
2550 if (pcm->card->shutdown) {
2551 err = -ENODEV;
2552 break;
2553 }
2554 if (signal_pending(current)) {
2555 err = -ERESTARTSYS;
2556 break;
2557 }
2558 }
2559 remove_wait_queue(&pcm->open_wait, &wait);
2560 mutex_unlock(&pcm->open_mutex);
2561 if (err < 0)
2562 goto __error;
2563 snd_card_unref(pcm->card);
2564 return err;
2565
2566 __error:
2567 module_put(pcm->card->module);
2568 __error2:
2569 snd_card_file_remove(pcm->card, file);
2570 __error1:
2571 if (pcm)
2572 snd_card_unref(pcm->card);
2573 return err;
2574 }
2575
snd_pcm_oss_release(struct inode * inode,struct file * file)2576 static int snd_pcm_oss_release(struct inode *inode, struct file *file)
2577 {
2578 struct snd_pcm *pcm;
2579 struct snd_pcm_substream *substream;
2580 struct snd_pcm_oss_file *pcm_oss_file;
2581
2582 pcm_oss_file = file->private_data;
2583 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2584 if (substream == NULL)
2585 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2586 if (snd_BUG_ON(!substream))
2587 return -ENXIO;
2588 pcm = substream->pcm;
2589 if (!pcm->card->shutdown)
2590 snd_pcm_oss_sync(pcm_oss_file);
2591 mutex_lock(&pcm->open_mutex);
2592 snd_pcm_oss_release_file(pcm_oss_file);
2593 mutex_unlock(&pcm->open_mutex);
2594 wake_up(&pcm->open_wait);
2595 module_put(pcm->card->module);
2596 snd_card_file_remove(pcm->card, file);
2597 return 0;
2598 }
2599
snd_pcm_oss_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2600 static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2601 {
2602 struct snd_pcm_oss_file *pcm_oss_file;
2603 int __user *p = (int __user *)arg;
2604 int res;
2605
2606 pcm_oss_file = file->private_data;
2607 if (cmd == OSS_GETVERSION)
2608 return put_user(SNDRV_OSS_VERSION, p);
2609 if (cmd == OSS_ALSAEMULVER)
2610 return put_user(1, p);
2611 #if IS_REACHABLE(CONFIG_SND_MIXER_OSS)
2612 if (((cmd >> 8) & 0xff) == 'M') { /* mixer ioctl - for OSS compatibility */
2613 struct snd_pcm_substream *substream;
2614 int idx;
2615 for (idx = 0; idx < 2; ++idx) {
2616 substream = pcm_oss_file->streams[idx];
2617 if (substream != NULL)
2618 break;
2619 }
2620 if (snd_BUG_ON(idx >= 2))
2621 return -ENXIO;
2622 return snd_mixer_oss_ioctl_card(substream->pcm->card, cmd, arg);
2623 }
2624 #endif
2625 if (((cmd >> 8) & 0xff) != 'P')
2626 return -EINVAL;
2627 #ifdef OSS_DEBUG
2628 pr_debug("pcm_oss: ioctl = 0x%x\n", cmd);
2629 #endif
2630 switch (cmd) {
2631 case SNDCTL_DSP_RESET:
2632 return snd_pcm_oss_reset(pcm_oss_file);
2633 case SNDCTL_DSP_SYNC:
2634 return snd_pcm_oss_sync(pcm_oss_file);
2635 case SNDCTL_DSP_SPEED:
2636 if (get_user(res, p))
2637 return -EFAULT;
2638 res = snd_pcm_oss_set_rate(pcm_oss_file, res);
2639 if (res < 0)
2640 return res;
2641 return put_user(res, p);
2642 case SOUND_PCM_READ_RATE:
2643 res = snd_pcm_oss_get_rate(pcm_oss_file);
2644 if (res < 0)
2645 return res;
2646 return put_user(res, p);
2647 case SNDCTL_DSP_STEREO:
2648 if (get_user(res, p))
2649 return -EFAULT;
2650 res = res > 0 ? 2 : 1;
2651 res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2652 if (res < 0)
2653 return res;
2654 return put_user(--res, p);
2655 case SNDCTL_DSP_GETBLKSIZE:
2656 res = snd_pcm_oss_get_block_size(pcm_oss_file);
2657 if (res < 0)
2658 return res;
2659 return put_user(res, p);
2660 case SNDCTL_DSP_SETFMT:
2661 if (get_user(res, p))
2662 return -EFAULT;
2663 res = snd_pcm_oss_set_format(pcm_oss_file, res);
2664 if (res < 0)
2665 return res;
2666 return put_user(res, p);
2667 case SOUND_PCM_READ_BITS:
2668 res = snd_pcm_oss_get_format(pcm_oss_file);
2669 if (res < 0)
2670 return res;
2671 return put_user(res, p);
2672 case SNDCTL_DSP_CHANNELS:
2673 if (get_user(res, p))
2674 return -EFAULT;
2675 res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2676 if (res < 0)
2677 return res;
2678 return put_user(res, p);
2679 case SOUND_PCM_READ_CHANNELS:
2680 res = snd_pcm_oss_get_channels(pcm_oss_file);
2681 if (res < 0)
2682 return res;
2683 return put_user(res, p);
2684 case SOUND_PCM_WRITE_FILTER:
2685 case SOUND_PCM_READ_FILTER:
2686 return -EIO;
2687 case SNDCTL_DSP_POST:
2688 return snd_pcm_oss_post(pcm_oss_file);
2689 case SNDCTL_DSP_SUBDIVIDE:
2690 if (get_user(res, p))
2691 return -EFAULT;
2692 res = snd_pcm_oss_set_subdivide(pcm_oss_file, res);
2693 if (res < 0)
2694 return res;
2695 return put_user(res, p);
2696 case SNDCTL_DSP_SETFRAGMENT:
2697 if (get_user(res, p))
2698 return -EFAULT;
2699 return snd_pcm_oss_set_fragment(pcm_oss_file, res);
2700 case SNDCTL_DSP_GETFMTS:
2701 res = snd_pcm_oss_get_formats(pcm_oss_file);
2702 if (res < 0)
2703 return res;
2704 return put_user(res, p);
2705 case SNDCTL_DSP_GETOSPACE:
2706 case SNDCTL_DSP_GETISPACE:
2707 return snd_pcm_oss_get_space(pcm_oss_file,
2708 cmd == SNDCTL_DSP_GETISPACE ?
2709 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2710 (struct audio_buf_info __user *) arg);
2711 case SNDCTL_DSP_NONBLOCK:
2712 return snd_pcm_oss_nonblock(file);
2713 case SNDCTL_DSP_GETCAPS:
2714 res = snd_pcm_oss_get_caps(pcm_oss_file);
2715 if (res < 0)
2716 return res;
2717 return put_user(res, p);
2718 case SNDCTL_DSP_GETTRIGGER:
2719 res = snd_pcm_oss_get_trigger(pcm_oss_file);
2720 if (res < 0)
2721 return res;
2722 return put_user(res, p);
2723 case SNDCTL_DSP_SETTRIGGER:
2724 if (get_user(res, p))
2725 return -EFAULT;
2726 return snd_pcm_oss_set_trigger(pcm_oss_file, res);
2727 case SNDCTL_DSP_GETIPTR:
2728 case SNDCTL_DSP_GETOPTR:
2729 return snd_pcm_oss_get_ptr(pcm_oss_file,
2730 cmd == SNDCTL_DSP_GETIPTR ?
2731 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2732 (struct count_info __user *) arg);
2733 case SNDCTL_DSP_MAPINBUF:
2734 case SNDCTL_DSP_MAPOUTBUF:
2735 return snd_pcm_oss_get_mapbuf(pcm_oss_file,
2736 cmd == SNDCTL_DSP_MAPINBUF ?
2737 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2738 (struct buffmem_desc __user *) arg);
2739 case SNDCTL_DSP_SETSYNCRO:
2740 /* stop DMA now.. */
2741 return 0;
2742 case SNDCTL_DSP_SETDUPLEX:
2743 if (snd_pcm_oss_get_caps(pcm_oss_file) & DSP_CAP_DUPLEX)
2744 return 0;
2745 return -EIO;
2746 case SNDCTL_DSP_GETODELAY:
2747 res = snd_pcm_oss_get_odelay(pcm_oss_file);
2748 if (res < 0) {
2749 /* it's for sure, some broken apps don't check for error codes */
2750 put_user(0, p);
2751 return res;
2752 }
2753 return put_user(res, p);
2754 case SNDCTL_DSP_PROFILE:
2755 return 0; /* silently ignore */
2756 default:
2757 pr_debug("pcm_oss: unknown command = 0x%x\n", cmd);
2758 }
2759 return -EINVAL;
2760 }
2761
2762 #ifdef CONFIG_COMPAT
2763 /* all compatible */
snd_pcm_oss_ioctl_compat(struct file * file,unsigned int cmd,unsigned long arg)2764 static long snd_pcm_oss_ioctl_compat(struct file *file, unsigned int cmd,
2765 unsigned long arg)
2766 {
2767 /*
2768 * Everything is compatbile except SNDCTL_DSP_MAPINBUF/SNDCTL_DSP_MAPOUTBUF,
2769 * which are not implemented for the native case either
2770 */
2771 return snd_pcm_oss_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2772 }
2773 #else
2774 #define snd_pcm_oss_ioctl_compat NULL
2775 #endif
2776
snd_pcm_oss_read(struct file * file,char __user * buf,size_t count,loff_t * offset)2777 static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
2778 {
2779 struct snd_pcm_oss_file *pcm_oss_file;
2780 struct snd_pcm_substream *substream;
2781
2782 pcm_oss_file = file->private_data;
2783 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2784 if (substream == NULL)
2785 return -ENXIO;
2786 substream->f_flags = file->f_flags & O_NONBLOCK;
2787 #ifndef OSS_DEBUG
2788 return snd_pcm_oss_read1(substream, buf, count);
2789 #else
2790 {
2791 ssize_t res = snd_pcm_oss_read1(substream, buf, count);
2792 pcm_dbg(substream->pcm,
2793 "pcm_oss: read %li bytes (returned %li bytes)\n",
2794 (long)count, (long)res);
2795 return res;
2796 }
2797 #endif
2798 }
2799
snd_pcm_oss_write(struct file * file,const char __user * buf,size_t count,loff_t * offset)2800 static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
2801 {
2802 struct snd_pcm_oss_file *pcm_oss_file;
2803 struct snd_pcm_substream *substream;
2804 long result;
2805
2806 pcm_oss_file = file->private_data;
2807 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2808 if (substream == NULL)
2809 return -ENXIO;
2810 substream->f_flags = file->f_flags & O_NONBLOCK;
2811 result = snd_pcm_oss_write1(substream, buf, count);
2812 #ifdef OSS_DEBUG
2813 pcm_dbg(substream->pcm, "pcm_oss: write %li bytes (wrote %li bytes)\n",
2814 (long)count, (long)result);
2815 #endif
2816 return result;
2817 }
2818
snd_pcm_oss_playback_ready(struct snd_pcm_substream * substream)2819 static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)
2820 {
2821 struct snd_pcm_runtime *runtime = substream->runtime;
2822 if (atomic_read(&substream->mmap_count))
2823 return runtime->oss.prev_hw_ptr_period !=
2824 get_hw_ptr_period(runtime);
2825 else
2826 return snd_pcm_playback_avail(runtime) >=
2827 runtime->oss.period_frames;
2828 }
2829
snd_pcm_oss_capture_ready(struct snd_pcm_substream * substream)2830 static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)
2831 {
2832 struct snd_pcm_runtime *runtime = substream->runtime;
2833 if (atomic_read(&substream->mmap_count))
2834 return runtime->oss.prev_hw_ptr_period !=
2835 get_hw_ptr_period(runtime);
2836 else
2837 return snd_pcm_capture_avail(runtime) >=
2838 runtime->oss.period_frames;
2839 }
2840
snd_pcm_oss_poll(struct file * file,poll_table * wait)2841 static __poll_t snd_pcm_oss_poll(struct file *file, poll_table * wait)
2842 {
2843 struct snd_pcm_oss_file *pcm_oss_file;
2844 __poll_t mask;
2845 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2846
2847 pcm_oss_file = file->private_data;
2848
2849 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2850 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2851
2852 mask = 0;
2853 if (psubstream != NULL) {
2854 struct snd_pcm_runtime *runtime = psubstream->runtime;
2855 poll_wait(file, &runtime->sleep, wait);
2856 snd_pcm_stream_lock_irq(psubstream);
2857 if (runtime->state != SNDRV_PCM_STATE_DRAINING &&
2858 (runtime->state != SNDRV_PCM_STATE_RUNNING ||
2859 snd_pcm_oss_playback_ready(psubstream)))
2860 mask |= EPOLLOUT | EPOLLWRNORM;
2861 snd_pcm_stream_unlock_irq(psubstream);
2862 }
2863 if (csubstream != NULL) {
2864 struct snd_pcm_runtime *runtime = csubstream->runtime;
2865 snd_pcm_state_t ostate;
2866 poll_wait(file, &runtime->sleep, wait);
2867 snd_pcm_stream_lock_irq(csubstream);
2868 ostate = runtime->state;
2869 if (ostate != SNDRV_PCM_STATE_RUNNING ||
2870 snd_pcm_oss_capture_ready(csubstream))
2871 mask |= EPOLLIN | EPOLLRDNORM;
2872 snd_pcm_stream_unlock_irq(csubstream);
2873 if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) {
2874 struct snd_pcm_oss_file ofile;
2875 memset(&ofile, 0, sizeof(ofile));
2876 ofile.streams[SNDRV_PCM_STREAM_CAPTURE] = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2877 runtime->oss.trigger = 0;
2878 snd_pcm_oss_set_trigger(&ofile, PCM_ENABLE_INPUT);
2879 }
2880 }
2881
2882 return mask;
2883 }
2884
snd_pcm_oss_mmap(struct file * file,struct vm_area_struct * area)2885 static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area)
2886 {
2887 struct snd_pcm_oss_file *pcm_oss_file;
2888 struct snd_pcm_substream *substream = NULL;
2889 struct snd_pcm_runtime *runtime;
2890 int err;
2891
2892 #ifdef OSS_DEBUG
2893 pr_debug("pcm_oss: mmap begin\n");
2894 #endif
2895 pcm_oss_file = file->private_data;
2896 switch ((area->vm_flags & (VM_READ | VM_WRITE))) {
2897 case VM_READ | VM_WRITE:
2898 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2899 if (substream)
2900 break;
2901 fallthrough;
2902 case VM_READ:
2903 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2904 break;
2905 case VM_WRITE:
2906 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2907 break;
2908 default:
2909 return -EINVAL;
2910 }
2911 /* set VM_READ access as well to fix memset() routines that do
2912 reads before writes (to improve performance) */
2913 area->vm_flags |= VM_READ;
2914 if (substream == NULL)
2915 return -ENXIO;
2916 runtime = substream->runtime;
2917 if (!(runtime->info & SNDRV_PCM_INFO_MMAP_VALID))
2918 return -EIO;
2919 if (runtime->info & SNDRV_PCM_INFO_INTERLEAVED)
2920 runtime->access = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2921 else
2922 return -EIO;
2923
2924 if (runtime->oss.params) {
2925 /* use mutex_trylock() for params_lock for avoiding a deadlock
2926 * between mmap_lock and params_lock taken by
2927 * copy_from/to_user() in snd_pcm_oss_write/read()
2928 */
2929 err = snd_pcm_oss_change_params(substream, true);
2930 if (err < 0)
2931 return err;
2932 }
2933 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2934 if (runtime->oss.plugin_first != NULL)
2935 return -EIO;
2936 #endif
2937
2938 if (area->vm_pgoff != 0)
2939 return -EINVAL;
2940
2941 err = snd_pcm_mmap_data(substream, file, area);
2942 if (err < 0)
2943 return err;
2944 runtime->oss.mmap_bytes = area->vm_end - area->vm_start;
2945 runtime->silence_threshold = 0;
2946 runtime->silence_size = 0;
2947 #ifdef OSS_DEBUG
2948 pr_debug("pcm_oss: mmap ok, bytes = 0x%x\n",
2949 runtime->oss.mmap_bytes);
2950 #endif
2951 /* In mmap mode we never stop */
2952 runtime->stop_threshold = runtime->boundary;
2953
2954 return 0;
2955 }
2956
2957 #ifdef CONFIG_SND_VERBOSE_PROCFS
2958 /*
2959 * /proc interface
2960 */
2961
snd_pcm_oss_proc_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)2962 static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
2963 struct snd_info_buffer *buffer)
2964 {
2965 struct snd_pcm_str *pstr = entry->private_data;
2966 struct snd_pcm_oss_setup *setup = pstr->oss.setup_list;
2967 mutex_lock(&pstr->oss.setup_mutex);
2968 while (setup) {
2969 snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s\n",
2970 setup->task_name,
2971 setup->periods,
2972 setup->period_size,
2973 setup->disable ? " disable" : "",
2974 setup->direct ? " direct" : "",
2975 setup->block ? " block" : "",
2976 setup->nonblock ? " non-block" : "",
2977 setup->partialfrag ? " partial-frag" : "",
2978 setup->nosilence ? " no-silence" : "");
2979 setup = setup->next;
2980 }
2981 mutex_unlock(&pstr->oss.setup_mutex);
2982 }
2983
snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)2984 static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)
2985 {
2986 struct snd_pcm_oss_setup *setup, *setupn;
2987
2988 for (setup = pstr->oss.setup_list, pstr->oss.setup_list = NULL;
2989 setup; setup = setupn) {
2990 setupn = setup->next;
2991 kfree(setup->task_name);
2992 kfree(setup);
2993 }
2994 pstr->oss.setup_list = NULL;
2995 }
2996
snd_pcm_oss_proc_write(struct snd_info_entry * entry,struct snd_info_buffer * buffer)2997 static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
2998 struct snd_info_buffer *buffer)
2999 {
3000 struct snd_pcm_str *pstr = entry->private_data;
3001 char line[128], str[32], task_name[32];
3002 const char *ptr;
3003 int idx1;
3004 struct snd_pcm_oss_setup *setup, *setup1, template;
3005
3006 while (!snd_info_get_line(buffer, line, sizeof(line))) {
3007 mutex_lock(&pstr->oss.setup_mutex);
3008 memset(&template, 0, sizeof(template));
3009 ptr = snd_info_get_str(task_name, line, sizeof(task_name));
3010 if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) {
3011 snd_pcm_oss_proc_free_setup_list(pstr);
3012 mutex_unlock(&pstr->oss.setup_mutex);
3013 continue;
3014 }
3015 for (setup = pstr->oss.setup_list; setup; setup = setup->next) {
3016 if (!strcmp(setup->task_name, task_name)) {
3017 template = *setup;
3018 break;
3019 }
3020 }
3021 ptr = snd_info_get_str(str, ptr, sizeof(str));
3022 template.periods = simple_strtoul(str, NULL, 10);
3023 ptr = snd_info_get_str(str, ptr, sizeof(str));
3024 template.period_size = simple_strtoul(str, NULL, 10);
3025 for (idx1 = 31; idx1 >= 0; idx1--)
3026 if (template.period_size & (1 << idx1))
3027 break;
3028 for (idx1--; idx1 >= 0; idx1--)
3029 template.period_size &= ~(1 << idx1);
3030 do {
3031 ptr = snd_info_get_str(str, ptr, sizeof(str));
3032 if (!strcmp(str, "disable")) {
3033 template.disable = 1;
3034 } else if (!strcmp(str, "direct")) {
3035 template.direct = 1;
3036 } else if (!strcmp(str, "block")) {
3037 template.block = 1;
3038 } else if (!strcmp(str, "non-block")) {
3039 template.nonblock = 1;
3040 } else if (!strcmp(str, "partial-frag")) {
3041 template.partialfrag = 1;
3042 } else if (!strcmp(str, "no-silence")) {
3043 template.nosilence = 1;
3044 } else if (!strcmp(str, "buggy-ptr")) {
3045 template.buggyptr = 1;
3046 }
3047 } while (*str);
3048 if (setup == NULL) {
3049 setup = kmalloc(sizeof(*setup), GFP_KERNEL);
3050 if (! setup) {
3051 buffer->error = -ENOMEM;
3052 mutex_unlock(&pstr->oss.setup_mutex);
3053 return;
3054 }
3055 if (pstr->oss.setup_list == NULL)
3056 pstr->oss.setup_list = setup;
3057 else {
3058 for (setup1 = pstr->oss.setup_list;
3059 setup1->next; setup1 = setup1->next);
3060 setup1->next = setup;
3061 }
3062 template.task_name = kstrdup(task_name, GFP_KERNEL);
3063 if (! template.task_name) {
3064 kfree(setup);
3065 buffer->error = -ENOMEM;
3066 mutex_unlock(&pstr->oss.setup_mutex);
3067 return;
3068 }
3069 }
3070 *setup = template;
3071 mutex_unlock(&pstr->oss.setup_mutex);
3072 }
3073 }
3074
snd_pcm_oss_proc_init(struct snd_pcm * pcm)3075 static void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3076 {
3077 int stream;
3078 for (stream = 0; stream < 2; ++stream) {
3079 struct snd_info_entry *entry;
3080 struct snd_pcm_str *pstr = &pcm->streams[stream];
3081 if (pstr->substream_count == 0)
3082 continue;
3083 entry = snd_info_create_card_entry(pcm->card, "oss", pstr->proc_root);
3084 if (entry) {
3085 entry->content = SNDRV_INFO_CONTENT_TEXT;
3086 entry->mode = S_IFREG | 0644;
3087 entry->c.text.read = snd_pcm_oss_proc_read;
3088 entry->c.text.write = snd_pcm_oss_proc_write;
3089 entry->private_data = pstr;
3090 if (snd_info_register(entry) < 0) {
3091 snd_info_free_entry(entry);
3092 entry = NULL;
3093 }
3094 }
3095 pstr->oss.proc_entry = entry;
3096 }
3097 }
3098
snd_pcm_oss_proc_done(struct snd_pcm * pcm)3099 static void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3100 {
3101 int stream;
3102 for (stream = 0; stream < 2; ++stream) {
3103 struct snd_pcm_str *pstr = &pcm->streams[stream];
3104 snd_info_free_entry(pstr->oss.proc_entry);
3105 pstr->oss.proc_entry = NULL;
3106 snd_pcm_oss_proc_free_setup_list(pstr);
3107 }
3108 }
3109 #else /* !CONFIG_SND_VERBOSE_PROCFS */
snd_pcm_oss_proc_init(struct snd_pcm * pcm)3110 static inline void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3111 {
3112 }
snd_pcm_oss_proc_done(struct snd_pcm * pcm)3113 static inline void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3114 {
3115 }
3116 #endif /* CONFIG_SND_VERBOSE_PROCFS */
3117
3118 /*
3119 * ENTRY functions
3120 */
3121
3122 static const struct file_operations snd_pcm_oss_f_reg =
3123 {
3124 .owner = THIS_MODULE,
3125 .read = snd_pcm_oss_read,
3126 .write = snd_pcm_oss_write,
3127 .open = snd_pcm_oss_open,
3128 .release = snd_pcm_oss_release,
3129 .llseek = no_llseek,
3130 .poll = snd_pcm_oss_poll,
3131 .unlocked_ioctl = snd_pcm_oss_ioctl,
3132 .compat_ioctl = snd_pcm_oss_ioctl_compat,
3133 .mmap = snd_pcm_oss_mmap,
3134 };
3135
register_oss_dsp(struct snd_pcm * pcm,int index)3136 static void register_oss_dsp(struct snd_pcm *pcm, int index)
3137 {
3138 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3139 pcm->card, index, &snd_pcm_oss_f_reg,
3140 pcm) < 0) {
3141 pcm_err(pcm, "unable to register OSS PCM device %i:%i\n",
3142 pcm->card->number, pcm->device);
3143 }
3144 }
3145
snd_pcm_oss_register_minor(struct snd_pcm * pcm)3146 static int snd_pcm_oss_register_minor(struct snd_pcm *pcm)
3147 {
3148 pcm->oss.reg = 0;
3149 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3150 char name[128];
3151 int duplex;
3152 register_oss_dsp(pcm, 0);
3153 duplex = (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count > 0 &&
3154 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count &&
3155 !(pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX));
3156 sprintf(name, "%s%s", pcm->name, duplex ? " (DUPLEX)" : "");
3157 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3158 snd_oss_info_register(SNDRV_OSS_INFO_DEV_AUDIO,
3159 pcm->card->number,
3160 name);
3161 #endif
3162 pcm->oss.reg++;
3163 pcm->oss.reg_mask |= 1;
3164 }
3165 if (adsp_map[pcm->card->number] == (int)pcm->device) {
3166 register_oss_dsp(pcm, 1);
3167 pcm->oss.reg++;
3168 pcm->oss.reg_mask |= 2;
3169 }
3170
3171 if (pcm->oss.reg)
3172 snd_pcm_oss_proc_init(pcm);
3173
3174 return 0;
3175 }
3176
snd_pcm_oss_disconnect_minor(struct snd_pcm * pcm)3177 static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm)
3178 {
3179 if (pcm->oss.reg) {
3180 if (pcm->oss.reg_mask & 1) {
3181 pcm->oss.reg_mask &= ~1;
3182 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3183 pcm->card, 0);
3184 }
3185 if (pcm->oss.reg_mask & 2) {
3186 pcm->oss.reg_mask &= ~2;
3187 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3188 pcm->card, 1);
3189 }
3190 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3191 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3192 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number);
3193 #endif
3194 }
3195 pcm->oss.reg = 0;
3196 }
3197 return 0;
3198 }
3199
snd_pcm_oss_unregister_minor(struct snd_pcm * pcm)3200 static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm)
3201 {
3202 snd_pcm_oss_disconnect_minor(pcm);
3203 snd_pcm_oss_proc_done(pcm);
3204 return 0;
3205 }
3206
3207 static struct snd_pcm_notify snd_pcm_oss_notify =
3208 {
3209 .n_register = snd_pcm_oss_register_minor,
3210 .n_disconnect = snd_pcm_oss_disconnect_minor,
3211 .n_unregister = snd_pcm_oss_unregister_minor,
3212 };
3213
alsa_pcm_oss_init(void)3214 static int __init alsa_pcm_oss_init(void)
3215 {
3216 int i;
3217 int err;
3218
3219 /* check device map table */
3220 for (i = 0; i < SNDRV_CARDS; i++) {
3221 if (dsp_map[i] < 0 || dsp_map[i] >= SNDRV_PCM_DEVICES) {
3222 pr_err("ALSA: pcm_oss: invalid dsp_map[%d] = %d\n",
3223 i, dsp_map[i]);
3224 dsp_map[i] = 0;
3225 }
3226 if (adsp_map[i] < 0 || adsp_map[i] >= SNDRV_PCM_DEVICES) {
3227 pr_err("ALSA: pcm_oss: invalid adsp_map[%d] = %d\n",
3228 i, adsp_map[i]);
3229 adsp_map[i] = 1;
3230 }
3231 }
3232 err = snd_pcm_notify(&snd_pcm_oss_notify, 0);
3233 if (err < 0)
3234 return err;
3235 return 0;
3236 }
3237
alsa_pcm_oss_exit(void)3238 static void __exit alsa_pcm_oss_exit(void)
3239 {
3240 snd_pcm_notify(&snd_pcm_oss_notify, 1);
3241 }
3242
3243 module_init(alsa_pcm_oss_init)
3244 module_exit(alsa_pcm_oss_exit)
3245