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