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
35static int dsp_map[SNDRV_CARDS];
36static int adsp_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
37static bool nonblock_open = 1;
38
39MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
40MODULE_DESCRIPTION("PCM OSS emulation for ALSA.");
41MODULE_LICENSE("GPL");
42module_param_array(dsp_map, int, NULL, 0444);
43MODULE_PARM_DESC(dsp_map, "PCM device number assigned to 1st OSS device.");
44module_param_array(adsp_map, int, NULL, 0444);
45MODULE_PARM_DESC(adsp_map, "PCM device number assigned to 2nd OSS device.");
46module_param(nonblock_open, bool, 0644);
47MODULE_PARM_DESC(nonblock_open, "Don't block opening busy PCM devices.");
48MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM);
49MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM1);
50
51static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file);
52static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file);
53static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file);
54
55/*
56 * helper functions to process hw_params
57 */
58static 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
82static 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
106static 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, v: &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 */
124static unsigned int
125snd_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(mask: 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 */
150static int
151snd_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(mask: 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
168static 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(mask: hw_param_mask(params, var), v: val);
174 if (changed > 0) {
175 params->cmask |= 1 << var;
176 params->rmask |= 1 << var;
177 }
178 return changed;
179}
180
181static 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(substream: pcm, params);
191 if (err < 0)
192 return err;
193 }
194 return 0;
195}
196
197static 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(mask: hw_param_mask(params, var),
215 val: val + !!open);
216 else if (hw_is_interval(var))
217 changed = snd_interval_refine_min(i: hw_param_interval(params, var),
218 min: val, openmin: 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 */
240static 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 ? *dir : 0);
246 if (changed < 0)
247 return changed;
248 if (params->rmask) {
249 int err = snd_pcm_hw_refine(substream: pcm, params);
250 if (err < 0)
251 return err;
252 }
253 return snd_pcm_hw_param_value_min(params, var, dir);
254}
255
256static 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(mask: hw_param_mask(params, var));
273 changed = -EINVAL;
274 } else
275 changed = snd_mask_refine_max(mask: hw_param_mask(params, var),
276 val: val - !!open);
277 } else if (hw_is_interval(var))
278 changed = snd_interval_refine_max(i: hw_param_interval(params, var),
279 max: val, openmax: 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 */
301static 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 ? *dir : 0);
307 if (changed < 0)
308 return changed;
309 if (params->rmask) {
310 int err = snd_pcm_hw_refine(substream: pcm, params);
311 if (err < 0)
312 return err;
313 }
314 return snd_pcm_hw_param_value_max(params, var, dir);
315}
316
317static 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
333static 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 */
350static 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(a: best, adir: bestdir, b: min, bdir: mindir, c: &dmin, cdir: &dmindir);
357 boundary_sub(a: max, adir: maxdir, b: best, bdir: bestdir, c: &dmax, cdir: &dmaxdir);
358 return boundary_lt(a: dmin, adir: dmindir, b: dmax, bdir: 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 */
375static 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, val: min, dir: &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, params: params1, var, val: max, dir: &maxdir);
417 if (max < 0)
418 goto _end;
419 if (boundary_nearer(min: max, mindir: maxdir, best, bestdir: valdir, max: min, maxdir: mindir)) {
420 *params = *params1;
421 last = 1;
422 }
423 } else {
424 *params = *save;
425 max = snd_pcm_hw_param_max(pcm, params, var, val: max, dir: &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
438static 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(mask: m);
448 } else {
449 if (dir > 0)
450 val++;
451 else if (dir < 0)
452 val--;
453 changed = snd_mask_refine_set(mask: 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, v: &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 */
498static 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(substream: pcm, params);
508 if (err < 0)
509 return err;
510 }
511 return snd_pcm_hw_param_value(params, var, NULL);
512}
513
514static 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(i: 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
531static 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
546static 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
561int 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
577static 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, size: 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
594static 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, size: bytes);
600 return bytes_to_frames(runtime, size: (buffer_size * bytes) / runtime->oss.buffer_bytes);
601}
602
603static inline
604snd_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
625static 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
649static 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
673static 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(format: params_format(p: oss_params)) *
685 params_channels(p: oss_params) / 8;
686
687 oss_buffer_size = snd_pcm_hw_param_value_max(params: 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(handle: substream,
693 drv_size: 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(v: &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(p: oss_params) * snd_pcm_format_physical_width(format: params_format(p: oss_params)) * params_channels(p: 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(handle: substream,
730 drv_size: snd_pcm_hw_param_value_min(params: 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(handle: substream,
739 drv_size: snd_pcm_hw_param_value_max(params: 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(params: 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(params: 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
780static 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(params: 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(pcm: substream, params,
801 SNDRV_PCM_HW_PARAM_RATE,
802 val: rate, dir: 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(pcm: substream, params, SNDRV_PCM_HW_PARAM_RATE, best: best_rate, NULL);
815}
816
817/* parameter locking: returns immediately if tried during streaming */
818static 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(v: &runtime->oss.rw_ref)) {
823 mutex_unlock(lock: &runtime->oss.params_lock);
824 return -EBUSY;
825 }
826 return 0;
827}
828
829static void unlock_params(struct snd_pcm_runtime *runtime)
830{
831 mutex_unlock(lock: &runtime->oss.params_lock);
832}
833
834static void snd_pcm_oss_release_buffers(struct snd_pcm_substream *substream)
835{
836 struct snd_pcm_runtime *runtime = substream->runtime;
837
838 kvfree(addr: 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 */
846static 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(v: &substream->mmap_count))
871 direct = 1;
872 else
873 direct = substream->oss.setup.direct;
874
875 _snd_pcm_hw_params_any(params: sparams);
876 _snd_pcm_hw_param_setinteger(params: sparams, SNDRV_PCM_HW_PARAM_PERIODS);
877 _snd_pcm_hw_param_min(params: sparams, SNDRV_PCM_HW_PARAM_PERIODS, val: 2, dir: 0);
878 snd_mask_none(mask: &mask);
879 if (atomic_read(v: &substream->mmap_count))
880 snd_mask_set(mask: &mask, val: (__force int)SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
881 else {
882 snd_mask_set(mask: &mask, val: (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED);
883 if (!direct)
884 snd_mask_set(mask: &mask, val: (__force int)SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
885 }
886 err = snd_pcm_hw_param_mask(pcm: substream, params: sparams, SNDRV_PCM_HW_PARAM_ACCESS, val: &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, params: sparams, best_rate: runtime->oss.rate);
894 if (err < 0)
895 goto failure;
896 err = snd_pcm_hw_param_near(pcm: substream, params: sparams,
897 SNDRV_PCM_HW_PARAM_CHANNELS,
898 best: runtime->oss.channels, NULL);
899 if (err < 0)
900 goto failure;
901
902 format = snd_pcm_oss_format_from(format: runtime->oss.format);
903
904 sformat_mask = hw_param_mask_c(params: sparams, SNDRV_PCM_HW_PARAM_FORMAT);
905 if (direct)
906 sformat = format;
907 else
908 sformat = snd_pcm_plug_slave_format(format, format_mask: sformat_mask);
909
910 if ((__force int)sformat < 0 ||
911 !snd_mask_test_format(mask: sformat_mask, format: sformat)) {
912 pcm_for_each_format(sformat) {
913 if (snd_mask_test_format(mask: sformat_mask, format: sformat) &&
914 snd_pcm_oss_format_to(format: 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(params: sparams, SNDRV_PCM_HW_PARAM_FORMAT, val: (__force int)sformat, dir: 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 val: (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED, dir: 0);
932 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
933 val: (__force int)snd_pcm_oss_format_from(format: runtime->oss.format), dir: 0);
934 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
935 val: runtime->oss.channels, dir: 0);
936 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
937 val: runtime->oss.rate, dir: 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(format: params_format(p: params)) *
947 params_channels(p: params) / 8;
948
949 err = snd_pcm_oss_period_size(substream, oss_params: params, slave_params: sparams);
950 if (err < 0)
951 goto failure;
952
953 n = snd_pcm_plug_slave_size(handle: substream, clt_size: runtime->oss.period_bytes / oss_frame_size);
954 err = snd_pcm_hw_param_near(pcm: substream, params: sparams, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, best: n, NULL);
955 if (err < 0)
956 goto failure;
957
958 err = snd_pcm_hw_param_near(pcm: substream, params: sparams, SNDRV_PCM_HW_PARAM_PERIODS,
959 best: 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, arg: 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, slave_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(handle: substream, params: sparams, r_plugin: &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(v: &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(v: &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, arg: 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(p: sparams);
1034 oss_period_size = snd_pcm_plug_client_size(handle: substream, drv_size: params_period_size(p: 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(plug: substream, frames: 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(format: params_format(p: params));
1064 runtime->oss.channels = params_channels(p: params);
1065 runtime->oss.rate = params_rate(p: params);
1066
1067 kvfree(addr: 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 err = snd_pcm_runtime_buffer_set_silence(runtime);
1078 if (err < 0)
1079 goto failure;
1080
1081 runtime->oss.period_frames = snd_pcm_alsa_frames(substream, bytes: oss_period_size);
1082
1083 err = 0;
1084failure:
1085 if (err)
1086 snd_pcm_oss_release_buffers(substream);
1087 kfree(objp: sw_params);
1088 kfree(objp: params);
1089 kfree(objp: sparams);
1090 return err;
1091}
1092
1093/* this one takes the lock by itself */
1094static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
1095 bool trylock)
1096{
1097 struct snd_pcm_runtime *runtime = substream->runtime;
1098 int err;
1099
1100 if (trylock) {
1101 if (!(mutex_trylock(&runtime->oss.params_lock)))
1102 return -EAGAIN;
1103 } else if (mutex_lock_interruptible(&runtime->oss.params_lock))
1104 return -ERESTARTSYS;
1105
1106 err = snd_pcm_oss_change_params_locked(substream);
1107 mutex_unlock(lock: &runtime->oss.params_lock);
1108 return err;
1109}
1110
1111static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream)
1112{
1113 int idx, err;
1114 struct snd_pcm_substream *asubstream = NULL, *substream;
1115
1116 for (idx = 0; idx < 2; idx++) {
1117 substream = pcm_oss_file->streams[idx];
1118 if (substream == NULL)
1119 continue;
1120 if (asubstream == NULL)
1121 asubstream = substream;
1122 if (substream->runtime->oss.params) {
1123 err = snd_pcm_oss_change_params(substream, trylock: false);
1124 if (err < 0)
1125 return err;
1126 }
1127 }
1128 if (!asubstream)
1129 return -EIO;
1130 if (r_substream)
1131 *r_substream = asubstream;
1132 return 0;
1133}
1134
1135/* call with params_lock held */
1136/* NOTE: this always call PREPARE unconditionally no matter whether
1137 * runtime->oss.prepare is set or not
1138 */
1139static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
1140{
1141 int err;
1142 struct snd_pcm_runtime *runtime = substream->runtime;
1143
1144 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
1145 if (err < 0) {
1146 pcm_dbg(substream->pcm,
1147 "snd_pcm_oss_prepare: SNDRV_PCM_IOCTL_PREPARE failed\n");
1148 return err;
1149 }
1150 runtime->oss.prepare = 0;
1151 runtime->oss.prev_hw_ptr_period = 0;
1152 runtime->oss.period_ptr = 0;
1153 runtime->oss.buffer_used = 0;
1154
1155 return 0;
1156}
1157
1158static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream)
1159{
1160 struct snd_pcm_runtime *runtime;
1161 int err;
1162
1163 runtime = substream->runtime;
1164 if (runtime->oss.params) {
1165 err = snd_pcm_oss_change_params(substream, trylock: false);
1166 if (err < 0)
1167 return err;
1168 }
1169 if (runtime->oss.prepare) {
1170 if (mutex_lock_interruptible(&runtime->oss.params_lock))
1171 return -ERESTARTSYS;
1172 err = snd_pcm_oss_prepare(substream);
1173 mutex_unlock(lock: &runtime->oss.params_lock);
1174 if (err < 0)
1175 return err;
1176 }
1177 return 0;
1178}
1179
1180/* call with params_lock held */
1181static int snd_pcm_oss_make_ready_locked(struct snd_pcm_substream *substream)
1182{
1183 struct snd_pcm_runtime *runtime;
1184 int err;
1185
1186 runtime = substream->runtime;
1187 if (runtime->oss.params) {
1188 err = snd_pcm_oss_change_params_locked(substream);
1189 if (err < 0)
1190 return err;
1191 }
1192 if (runtime->oss.prepare) {
1193 err = snd_pcm_oss_prepare(substream);
1194 if (err < 0)
1195 return err;
1196 }
1197 return 0;
1198}
1199
1200static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay)
1201{
1202 struct snd_pcm_runtime *runtime;
1203 snd_pcm_uframes_t frames;
1204 int err = 0;
1205
1206 while (1) {
1207 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, arg: delay);
1208 if (err < 0)
1209 break;
1210 runtime = substream->runtime;
1211 if (*delay <= (snd_pcm_sframes_t)runtime->buffer_size)
1212 break;
1213 /* in case of overrun, skip whole periods like OSS/Linux driver does */
1214 /* until avail(delay) <= buffer_size */
1215 frames = (*delay - runtime->buffer_size) + runtime->period_size - 1;
1216 frames /= runtime->period_size;
1217 frames *= runtime->period_size;
1218 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_FORWARD, arg: &frames);
1219 if (err < 0)
1220 break;
1221 }
1222 return err;
1223}
1224
1225snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1226{
1227 struct snd_pcm_runtime *runtime = substream->runtime;
1228 int ret;
1229 while (1) {
1230 if (runtime->state == SNDRV_PCM_STATE_XRUN ||
1231 runtime->state == SNDRV_PCM_STATE_SUSPENDED) {
1232#ifdef OSS_DEBUG
1233 pcm_dbg(substream->pcm,
1234 "pcm_oss: write: recovering from %s\n",
1235 runtime->state == SNDRV_PCM_STATE_XRUN ?
1236 "XRUN" : "SUSPEND");
1237#endif
1238 ret = snd_pcm_oss_prepare(substream);
1239 if (ret < 0)
1240 break;
1241 }
1242 mutex_unlock(lock: &runtime->oss.params_lock);
1243 ret = __snd_pcm_lib_xfer(substream, buf: (void *)ptr, interleaved: true,
1244 frames, in_kernel);
1245 mutex_lock(&runtime->oss.params_lock);
1246 if (ret != -EPIPE && ret != -ESTRPIPE)
1247 break;
1248 /* test, if we can't store new data, because the stream */
1249 /* has not been started */
1250 if (runtime->state == SNDRV_PCM_STATE_PREPARED)
1251 return -EAGAIN;
1252 }
1253 return ret;
1254}
1255
1256snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1257{
1258 struct snd_pcm_runtime *runtime = substream->runtime;
1259 snd_pcm_sframes_t delay;
1260 int ret;
1261 while (1) {
1262 if (runtime->state == SNDRV_PCM_STATE_XRUN ||
1263 runtime->state == SNDRV_PCM_STATE_SUSPENDED) {
1264#ifdef OSS_DEBUG
1265 pcm_dbg(substream->pcm,
1266 "pcm_oss: read: recovering from %s\n",
1267 runtime->state == SNDRV_PCM_STATE_XRUN ?
1268 "XRUN" : "SUSPEND");
1269#endif
1270 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1271 if (ret < 0)
1272 break;
1273 } else if (runtime->state == SNDRV_PCM_STATE_SETUP) {
1274 ret = snd_pcm_oss_prepare(substream);
1275 if (ret < 0)
1276 break;
1277 }
1278 ret = snd_pcm_oss_capture_position_fixup(substream, delay: &delay);
1279 if (ret < 0)
1280 break;
1281 mutex_unlock(lock: &runtime->oss.params_lock);
1282 ret = __snd_pcm_lib_xfer(substream, buf: (void *)ptr, interleaved: true,
1283 frames, in_kernel);
1284 mutex_lock(&runtime->oss.params_lock);
1285 if (ret == -EPIPE) {
1286 if (runtime->state == SNDRV_PCM_STATE_DRAINING) {
1287 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1288 if (ret < 0)
1289 break;
1290 }
1291 continue;
1292 }
1293 if (ret != -ESTRPIPE)
1294 break;
1295 }
1296 return ret;
1297}
1298
1299#ifdef CONFIG_SND_PCM_OSS_PLUGINS
1300snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1301{
1302 struct snd_pcm_runtime *runtime = substream->runtime;
1303 int ret;
1304 while (1) {
1305 if (runtime->state == SNDRV_PCM_STATE_XRUN ||
1306 runtime->state == SNDRV_PCM_STATE_SUSPENDED) {
1307#ifdef OSS_DEBUG
1308 pcm_dbg(substream->pcm,
1309 "pcm_oss: writev: recovering from %s\n",
1310 runtime->state == SNDRV_PCM_STATE_XRUN ?
1311 "XRUN" : "SUSPEND");
1312#endif
1313 ret = snd_pcm_oss_prepare(substream);
1314 if (ret < 0)
1315 break;
1316 }
1317 ret = snd_pcm_kernel_writev(substream, bufs, frames);
1318 if (ret != -EPIPE && ret != -ESTRPIPE)
1319 break;
1320
1321 /* test, if we can't store new data, because the stream */
1322 /* has not been started */
1323 if (runtime->state == SNDRV_PCM_STATE_PREPARED)
1324 return -EAGAIN;
1325 }
1326 return ret;
1327}
1328
1329snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1330{
1331 struct snd_pcm_runtime *runtime = substream->runtime;
1332 int ret;
1333 while (1) {
1334 if (runtime->state == SNDRV_PCM_STATE_XRUN ||
1335 runtime->state == SNDRV_PCM_STATE_SUSPENDED) {
1336#ifdef OSS_DEBUG
1337 pcm_dbg(substream->pcm,
1338 "pcm_oss: readv: recovering from %s\n",
1339 runtime->state == SNDRV_PCM_STATE_XRUN ?
1340 "XRUN" : "SUSPEND");
1341#endif
1342 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1343 if (ret < 0)
1344 break;
1345 } else if (runtime->state == SNDRV_PCM_STATE_SETUP) {
1346 ret = snd_pcm_oss_prepare(substream);
1347 if (ret < 0)
1348 break;
1349 }
1350 ret = snd_pcm_kernel_readv(substream, bufs, frames);
1351 if (ret != -EPIPE && ret != -ESTRPIPE)
1352 break;
1353 }
1354 return ret;
1355}
1356#endif /* CONFIG_SND_PCM_OSS_PLUGINS */
1357
1358static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel)
1359{
1360 struct snd_pcm_runtime *runtime = substream->runtime;
1361 snd_pcm_sframes_t frames, frames1;
1362#ifdef CONFIG_SND_PCM_OSS_PLUGINS
1363 if (runtime->oss.plugin_first) {
1364 struct snd_pcm_plugin_channel *channels;
1365 size_t oss_frame_bytes = (runtime->oss.plugin_first->src_width * runtime->oss.plugin_first->src_format.channels) / 8;
1366 if (!in_kernel) {
1367 if (copy_from_user(to: runtime->oss.buffer, from: (const char __force __user *)buf, n: bytes))
1368 return -EFAULT;
1369 buf = runtime->oss.buffer;
1370 }
1371 frames = bytes / oss_frame_bytes;
1372 frames1 = snd_pcm_plug_client_channels_buf(handle: substream, buf: (char *)buf, count: frames, channels: &channels);
1373 if (frames1 < 0)
1374 return frames1;
1375 frames1 = snd_pcm_plug_write_transfer(handle: substream, src_channels: channels, size: frames1);
1376 if (frames1 <= 0)
1377 return frames1;
1378 bytes = frames1 * oss_frame_bytes;
1379 } else
1380#endif
1381 {
1382 frames = bytes_to_frames(runtime, size: bytes);
1383 frames1 = snd_pcm_oss_write3(substream, ptr: buf, frames, in_kernel);
1384 if (frames1 <= 0)
1385 return frames1;
1386 bytes = frames_to_bytes(runtime, size: frames1);
1387 }
1388 return bytes;
1389}
1390
1391static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes)
1392{
1393 size_t xfer = 0;
1394 ssize_t tmp = 0;
1395 struct snd_pcm_runtime *runtime = substream->runtime;
1396
1397 if (atomic_read(v: &substream->mmap_count))
1398 return -ENXIO;
1399
1400 atomic_inc(v: &runtime->oss.rw_ref);
1401 while (bytes > 0) {
1402 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1403 tmp = -ERESTARTSYS;
1404 break;
1405 }
1406 tmp = snd_pcm_oss_make_ready_locked(substream);
1407 if (tmp < 0)
1408 goto err;
1409 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1410 tmp = bytes;
1411 if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
1412 tmp = runtime->oss.period_bytes - runtime->oss.buffer_used;
1413 if (tmp > 0) {
1414 if (copy_from_user(to: runtime->oss.buffer + runtime->oss.buffer_used, from: buf, n: tmp)) {
1415 tmp = -EFAULT;
1416 goto err;
1417 }
1418 }
1419 runtime->oss.buffer_used += tmp;
1420 buf += tmp;
1421 bytes -= tmp;
1422 xfer += tmp;
1423 if (substream->oss.setup.partialfrag ||
1424 runtime->oss.buffer_used == runtime->oss.period_bytes) {
1425 tmp = snd_pcm_oss_write2(substream, buf: runtime->oss.buffer + runtime->oss.period_ptr,
1426 bytes: runtime->oss.buffer_used - runtime->oss.period_ptr, in_kernel: 1);
1427 if (tmp <= 0)
1428 goto err;
1429 runtime->oss.bytes += tmp;
1430 runtime->oss.period_ptr += tmp;
1431 runtime->oss.period_ptr %= runtime->oss.period_bytes;
1432 if (runtime->oss.period_ptr == 0 ||
1433 runtime->oss.period_ptr == runtime->oss.buffer_used)
1434 runtime->oss.buffer_used = 0;
1435 else if ((substream->f_flags & O_NONBLOCK) != 0) {
1436 tmp = -EAGAIN;
1437 goto err;
1438 }
1439 }
1440 } else {
1441 tmp = snd_pcm_oss_write2(substream,
1442 buf: (const char __force *)buf,
1443 bytes: runtime->oss.period_bytes, in_kernel: 0);
1444 if (tmp <= 0)
1445 goto err;
1446 runtime->oss.bytes += tmp;
1447 buf += tmp;
1448 bytes -= tmp;
1449 xfer += tmp;
1450 if ((substream->f_flags & O_NONBLOCK) != 0 &&
1451 tmp != runtime->oss.period_bytes)
1452 tmp = -EAGAIN;
1453 }
1454 err:
1455 mutex_unlock(lock: &runtime->oss.params_lock);
1456 if (tmp < 0)
1457 break;
1458 if (signal_pending(current)) {
1459 tmp = -ERESTARTSYS;
1460 break;
1461 }
1462 tmp = 0;
1463 }
1464 atomic_dec(v: &runtime->oss.rw_ref);
1465 return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1466}
1467
1468static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel)
1469{
1470 struct snd_pcm_runtime *runtime = substream->runtime;
1471 snd_pcm_sframes_t frames, frames1;
1472#ifdef CONFIG_SND_PCM_OSS_PLUGINS
1473 char __user *final_dst = (char __force __user *)buf;
1474 if (runtime->oss.plugin_first) {
1475 struct snd_pcm_plugin_channel *channels;
1476 size_t oss_frame_bytes = (runtime->oss.plugin_last->dst_width * runtime->oss.plugin_last->dst_format.channels) / 8;
1477 if (!in_kernel)
1478 buf = runtime->oss.buffer;
1479 frames = bytes / oss_frame_bytes;
1480 frames1 = snd_pcm_plug_client_channels_buf(handle: substream, buf, count: frames, channels: &channels);
1481 if (frames1 < 0)
1482 return frames1;
1483 frames1 = snd_pcm_plug_read_transfer(handle: substream, dst_channels_final: channels, size: frames1);
1484 if (frames1 <= 0)
1485 return frames1;
1486 bytes = frames1 * oss_frame_bytes;
1487 if (!in_kernel && copy_to_user(to: final_dst, from: buf, n: bytes))
1488 return -EFAULT;
1489 } else
1490#endif
1491 {
1492 frames = bytes_to_frames(runtime, size: bytes);
1493 frames1 = snd_pcm_oss_read3(substream, ptr: buf, frames, in_kernel);
1494 if (frames1 <= 0)
1495 return frames1;
1496 bytes = frames_to_bytes(runtime, size: frames1);
1497 }
1498 return bytes;
1499}
1500
1501static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes)
1502{
1503 size_t xfer = 0;
1504 ssize_t tmp = 0;
1505 struct snd_pcm_runtime *runtime = substream->runtime;
1506
1507 if (atomic_read(v: &substream->mmap_count))
1508 return -ENXIO;
1509
1510 atomic_inc(v: &runtime->oss.rw_ref);
1511 while (bytes > 0) {
1512 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1513 tmp = -ERESTARTSYS;
1514 break;
1515 }
1516 tmp = snd_pcm_oss_make_ready_locked(substream);
1517 if (tmp < 0)
1518 goto err;
1519 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1520 if (runtime->oss.buffer_used == 0) {
1521 tmp = snd_pcm_oss_read2(substream, buf: runtime->oss.buffer, bytes: runtime->oss.period_bytes, in_kernel: 1);
1522 if (tmp <= 0)
1523 goto err;
1524 runtime->oss.bytes += tmp;
1525 runtime->oss.period_ptr = tmp;
1526 runtime->oss.buffer_used = tmp;
1527 }
1528 tmp = bytes;
1529 if ((size_t) tmp > runtime->oss.buffer_used)
1530 tmp = runtime->oss.buffer_used;
1531 if (copy_to_user(to: buf, from: runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), n: tmp)) {
1532 tmp = -EFAULT;
1533 goto err;
1534 }
1535 buf += tmp;
1536 bytes -= tmp;
1537 xfer += tmp;
1538 runtime->oss.buffer_used -= tmp;
1539 } else {
1540 tmp = snd_pcm_oss_read2(substream, buf: (char __force *)buf,
1541 bytes: runtime->oss.period_bytes, in_kernel: 0);
1542 if (tmp <= 0)
1543 goto err;
1544 runtime->oss.bytes += tmp;
1545 buf += tmp;
1546 bytes -= tmp;
1547 xfer += tmp;
1548 }
1549 err:
1550 mutex_unlock(lock: &runtime->oss.params_lock);
1551 if (tmp < 0)
1552 break;
1553 if (signal_pending(current)) {
1554 tmp = -ERESTARTSYS;
1555 break;
1556 }
1557 tmp = 0;
1558 }
1559 atomic_dec(v: &runtime->oss.rw_ref);
1560 return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1561}
1562
1563static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
1564{
1565 struct snd_pcm_substream *substream;
1566 struct snd_pcm_runtime *runtime;
1567 int i;
1568
1569 for (i = 0; i < 2; i++) {
1570 substream = pcm_oss_file->streams[i];
1571 if (!substream)
1572 continue;
1573 runtime = substream->runtime;
1574 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1575 mutex_lock(&runtime->oss.params_lock);
1576 runtime->oss.prepare = 1;
1577 runtime->oss.buffer_used = 0;
1578 runtime->oss.prev_hw_ptr_period = 0;
1579 runtime->oss.period_ptr = 0;
1580 mutex_unlock(lock: &runtime->oss.params_lock);
1581 }
1582 return 0;
1583}
1584
1585static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file)
1586{
1587 struct snd_pcm_substream *substream;
1588 int err;
1589
1590 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1591 if (substream != NULL) {
1592 err = snd_pcm_oss_make_ready(substream);
1593 if (err < 0)
1594 return err;
1595 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL);
1596 }
1597 /* note: all errors from the start action are ignored */
1598 /* OSS apps do not know, how to handle them */
1599 return 0;
1600}
1601
1602static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size)
1603{
1604 struct snd_pcm_runtime *runtime;
1605 ssize_t result = 0;
1606 snd_pcm_state_t state;
1607 long res;
1608 wait_queue_entry_t wait;
1609
1610 runtime = substream->runtime;
1611 init_waitqueue_entry(wq_entry: &wait, current);
1612 add_wait_queue(wq_head: &runtime->sleep, wq_entry: &wait);
1613#ifdef OSS_DEBUG
1614 pcm_dbg(substream->pcm, "sync1: size = %li\n", size);
1615#endif
1616 while (1) {
1617 result = snd_pcm_oss_write2(substream, buf: runtime->oss.buffer, bytes: size, in_kernel: 1);
1618 if (result > 0) {
1619 runtime->oss.buffer_used = 0;
1620 result = 0;
1621 break;
1622 }
1623 if (result != 0 && result != -EAGAIN)
1624 break;
1625 result = 0;
1626 set_current_state(TASK_INTERRUPTIBLE);
1627 scoped_guard(pcm_stream_lock_irq, substream)
1628 state = runtime->state;
1629 if (state != SNDRV_PCM_STATE_RUNNING) {
1630 set_current_state(TASK_RUNNING);
1631 break;
1632 }
1633 res = schedule_timeout(timeout: 10 * HZ);
1634 if (signal_pending(current)) {
1635 result = -ERESTARTSYS;
1636 break;
1637 }
1638 if (res == 0) {
1639 pcm_err(substream->pcm,
1640 "OSS sync error - DMA timeout\n");
1641 result = -EIO;
1642 break;
1643 }
1644 }
1645 remove_wait_queue(wq_head: &runtime->sleep, wq_entry: &wait);
1646 return result;
1647}
1648
1649static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
1650{
1651 int err = 0;
1652 unsigned int saved_f_flags;
1653 struct snd_pcm_substream *substream;
1654 struct snd_pcm_runtime *runtime;
1655 snd_pcm_format_t format;
1656 unsigned long width;
1657 size_t size;
1658
1659 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1660 if (substream != NULL) {
1661 runtime = substream->runtime;
1662 if (atomic_read(v: &substream->mmap_count))
1663 goto __direct;
1664 atomic_inc(v: &runtime->oss.rw_ref);
1665 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1666 atomic_dec(v: &runtime->oss.rw_ref);
1667 return -ERESTARTSYS;
1668 }
1669 err = snd_pcm_oss_make_ready_locked(substream);
1670 if (err < 0)
1671 goto unlock;
1672 format = snd_pcm_oss_format_from(format: runtime->oss.format);
1673 width = snd_pcm_format_physical_width(format);
1674 if (runtime->oss.buffer_used > 0) {
1675#ifdef OSS_DEBUG
1676 pcm_dbg(substream->pcm, "sync: buffer_used\n");
1677#endif
1678 size = (8 * (runtime->oss.period_bytes - runtime->oss.buffer_used) + 7) / width;
1679 snd_pcm_format_set_silence(format,
1680 buf: runtime->oss.buffer + runtime->oss.buffer_used,
1681 frames: size);
1682 err = snd_pcm_oss_sync1(substream, size: runtime->oss.period_bytes);
1683 if (err < 0)
1684 goto unlock;
1685 } else if (runtime->oss.period_ptr > 0) {
1686#ifdef OSS_DEBUG
1687 pcm_dbg(substream->pcm, "sync: period_ptr\n");
1688#endif
1689 size = runtime->oss.period_bytes - runtime->oss.period_ptr;
1690 snd_pcm_format_set_silence(format,
1691 buf: runtime->oss.buffer,
1692 frames: size * 8 / width);
1693 err = snd_pcm_oss_sync1(substream, size);
1694 if (err < 0)
1695 goto unlock;
1696 }
1697 /*
1698 * The ALSA's period might be a bit large than OSS one.
1699 * Fill the remain portion of ALSA period with zeros.
1700 */
1701 size = runtime->control->appl_ptr % runtime->period_size;
1702 if (size > 0) {
1703 size = runtime->period_size - size;
1704 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED)
1705 snd_pcm_lib_write(substream, NULL, frames: size);
1706 else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1707 snd_pcm_lib_writev(substream, NULL, frames: size);
1708 }
1709unlock:
1710 mutex_unlock(lock: &runtime->oss.params_lock);
1711 atomic_dec(v: &runtime->oss.rw_ref);
1712 if (err < 0)
1713 return err;
1714 /*
1715 * finish sync: drain the buffer
1716 */
1717 __direct:
1718 saved_f_flags = substream->f_flags;
1719 substream->f_flags &= ~O_NONBLOCK;
1720 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1721 substream->f_flags = saved_f_flags;
1722 if (err < 0)
1723 return err;
1724 mutex_lock(&runtime->oss.params_lock);
1725 runtime->oss.prepare = 1;
1726 mutex_unlock(lock: &runtime->oss.params_lock);
1727 }
1728
1729 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
1730 if (substream != NULL) {
1731 err = snd_pcm_oss_make_ready(substream);
1732 if (err < 0)
1733 return err;
1734 runtime = substream->runtime;
1735 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1736 if (err < 0)
1737 return err;
1738 mutex_lock(&runtime->oss.params_lock);
1739 runtime->oss.buffer_used = 0;
1740 runtime->oss.prepare = 1;
1741 mutex_unlock(lock: &runtime->oss.params_lock);
1742 }
1743 return 0;
1744}
1745
1746static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)
1747{
1748 int idx;
1749
1750 for (idx = 1; idx >= 0; --idx) {
1751 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1752 struct snd_pcm_runtime *runtime;
1753 int err;
1754
1755 if (substream == NULL)
1756 continue;
1757 runtime = substream->runtime;
1758 if (rate < 1000)
1759 rate = 1000;
1760 else if (rate > 192000)
1761 rate = 192000;
1762 err = lock_params(runtime);
1763 if (err < 0)
1764 return err;
1765 if (runtime->oss.rate != rate) {
1766 runtime->oss.params = 1;
1767 runtime->oss.rate = rate;
1768 }
1769 unlock_params(runtime);
1770 }
1771 return snd_pcm_oss_get_rate(pcm_oss_file);
1772}
1773
1774static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file)
1775{
1776 struct snd_pcm_substream *substream;
1777 int err;
1778
1779 err = snd_pcm_oss_get_active_substream(pcm_oss_file, r_substream: &substream);
1780 if (err < 0)
1781 return err;
1782 return substream->runtime->oss.rate;
1783}
1784
1785static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels)
1786{
1787 int idx;
1788 if (channels < 1)
1789 channels = 1;
1790 if (channels > 128)
1791 return -EINVAL;
1792 for (idx = 1; idx >= 0; --idx) {
1793 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1794 struct snd_pcm_runtime *runtime;
1795 int err;
1796
1797 if (substream == NULL)
1798 continue;
1799 runtime = substream->runtime;
1800 err = lock_params(runtime);
1801 if (err < 0)
1802 return err;
1803 if (runtime->oss.channels != channels) {
1804 runtime->oss.params = 1;
1805 runtime->oss.channels = channels;
1806 }
1807 unlock_params(runtime);
1808 }
1809 return snd_pcm_oss_get_channels(pcm_oss_file);
1810}
1811
1812static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file)
1813{
1814 struct snd_pcm_substream *substream;
1815 int err;
1816
1817 err = snd_pcm_oss_get_active_substream(pcm_oss_file, r_substream: &substream);
1818 if (err < 0)
1819 return err;
1820 return substream->runtime->oss.channels;
1821}
1822
1823static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file)
1824{
1825 struct snd_pcm_substream *substream;
1826 int err;
1827
1828 err = snd_pcm_oss_get_active_substream(pcm_oss_file, r_substream: &substream);
1829 if (err < 0)
1830 return err;
1831 return substream->runtime->oss.period_bytes;
1832}
1833
1834static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file)
1835{
1836 struct snd_pcm_substream *substream;
1837 int err;
1838 int direct;
1839 struct snd_pcm_hw_params *params __free(kfree) = NULL;
1840 unsigned int formats = 0;
1841 const struct snd_mask *format_mask;
1842 int fmt;
1843
1844 err = snd_pcm_oss_get_active_substream(pcm_oss_file, r_substream: &substream);
1845 if (err < 0)
1846 return err;
1847 if (atomic_read(v: &substream->mmap_count))
1848 direct = 1;
1849 else
1850 direct = substream->oss.setup.direct;
1851 if (!direct)
1852 return AFMT_MU_LAW | AFMT_U8 |
1853 AFMT_S16_LE | AFMT_S16_BE |
1854 AFMT_S8 | AFMT_U16_LE |
1855 AFMT_U16_BE |
1856 AFMT_S32_LE | AFMT_S32_BE |
1857 AFMT_S24_LE | AFMT_S24_BE |
1858 AFMT_S24_PACKED;
1859 params = kmalloc(sizeof(*params), GFP_KERNEL);
1860 if (!params)
1861 return -ENOMEM;
1862 _snd_pcm_hw_params_any(params);
1863 err = snd_pcm_hw_refine(substream, params);
1864 if (err < 0)
1865 return err;
1866 format_mask = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
1867 for (fmt = 0; fmt < 32; ++fmt) {
1868 if (snd_mask_test(mask: format_mask, val: fmt)) {
1869 int f = snd_pcm_oss_format_to(format: (__force snd_pcm_format_t)fmt);
1870 if (f >= 0)
1871 formats |= f;
1872 }
1873 }
1874
1875 return formats;
1876}
1877
1878static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format)
1879{
1880 int formats, idx;
1881 int err;
1882
1883 if (format != AFMT_QUERY) {
1884 formats = snd_pcm_oss_get_formats(pcm_oss_file);
1885 if (formats < 0)
1886 return formats;
1887 if (!(formats & format))
1888 format = AFMT_U8;
1889 for (idx = 1; idx >= 0; --idx) {
1890 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1891 struct snd_pcm_runtime *runtime;
1892 if (substream == NULL)
1893 continue;
1894 runtime = substream->runtime;
1895 err = lock_params(runtime);
1896 if (err < 0)
1897 return err;
1898 if (runtime->oss.format != format) {
1899 runtime->oss.params = 1;
1900 runtime->oss.format = format;
1901 }
1902 unlock_params(runtime);
1903 }
1904 }
1905 return snd_pcm_oss_get_format(pcm_oss_file);
1906}
1907
1908static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file)
1909{
1910 struct snd_pcm_substream *substream;
1911 int err;
1912
1913 err = snd_pcm_oss_get_active_substream(pcm_oss_file, r_substream: &substream);
1914 if (err < 0)
1915 return err;
1916 return substream->runtime->oss.format;
1917}
1918
1919static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide)
1920{
1921 struct snd_pcm_runtime *runtime;
1922
1923 runtime = substream->runtime;
1924 if (subdivide == 0) {
1925 subdivide = runtime->oss.subdivision;
1926 if (subdivide == 0)
1927 subdivide = 1;
1928 return subdivide;
1929 }
1930 if (runtime->oss.subdivision || runtime->oss.fragshift)
1931 return -EINVAL;
1932 if (subdivide != 1 && subdivide != 2 && subdivide != 4 &&
1933 subdivide != 8 && subdivide != 16)
1934 return -EINVAL;
1935 runtime->oss.subdivision = subdivide;
1936 runtime->oss.params = 1;
1937 return subdivide;
1938}
1939
1940static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide)
1941{
1942 int err = -EINVAL, idx;
1943
1944 for (idx = 1; idx >= 0; --idx) {
1945 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1946 struct snd_pcm_runtime *runtime;
1947
1948 if (substream == NULL)
1949 continue;
1950 runtime = substream->runtime;
1951 err = lock_params(runtime);
1952 if (err < 0)
1953 return err;
1954 err = snd_pcm_oss_set_subdivide1(substream, subdivide);
1955 unlock_params(runtime);
1956 if (err < 0)
1957 return err;
1958 }
1959 return err;
1960}
1961
1962static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val)
1963{
1964 struct snd_pcm_runtime *runtime;
1965 int fragshift;
1966
1967 runtime = substream->runtime;
1968 if (runtime->oss.subdivision || runtime->oss.fragshift)
1969 return -EINVAL;
1970 fragshift = val & 0xffff;
1971 if (fragshift >= 25) /* should be large enough */
1972 return -EINVAL;
1973 runtime->oss.fragshift = fragshift;
1974 runtime->oss.maxfrags = (val >> 16) & 0xffff;
1975 if (runtime->oss.fragshift < 4) /* < 16 */
1976 runtime->oss.fragshift = 4;
1977 if (runtime->oss.maxfrags < 2)
1978 runtime->oss.maxfrags = 2;
1979 runtime->oss.params = 1;
1980 return 0;
1981}
1982
1983static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val)
1984{
1985 int err = -EINVAL, idx;
1986
1987 for (idx = 1; idx >= 0; --idx) {
1988 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1989 struct snd_pcm_runtime *runtime;
1990
1991 if (substream == NULL)
1992 continue;
1993 runtime = substream->runtime;
1994 err = lock_params(runtime);
1995 if (err < 0)
1996 return err;
1997 err = snd_pcm_oss_set_fragment1(substream, val);
1998 unlock_params(runtime);
1999 if (err < 0)
2000 return err;
2001 }
2002 return err;
2003}
2004
2005static int snd_pcm_oss_nonblock(struct file * file)
2006{
2007 guard(spinlock)(l: &file->f_lock);
2008 file->f_flags |= O_NONBLOCK;
2009 return 0;
2010}
2011
2012static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res)
2013{
2014
2015 if (substream == NULL) {
2016 res &= ~DSP_CAP_DUPLEX;
2017 return res;
2018 }
2019#ifdef DSP_CAP_MULTI
2020 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2021 if (substream->pstr->substream_count > 1)
2022 res |= DSP_CAP_MULTI;
2023#endif
2024 /* DSP_CAP_REALTIME is set all times: */
2025 /* all ALSA drivers can return actual pointer in ring buffer */
2026#if defined(DSP_CAP_REALTIME) && 0
2027 {
2028 struct snd_pcm_runtime *runtime = substream->runtime;
2029 if (runtime->info & (SNDRV_PCM_INFO_BLOCK_TRANSFER|SNDRV_PCM_INFO_BATCH))
2030 res &= ~DSP_CAP_REALTIME;
2031 }
2032#endif
2033 return res;
2034}
2035
2036static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)
2037{
2038 int result, idx;
2039
2040 result = DSP_CAP_TRIGGER | DSP_CAP_MMAP | DSP_CAP_DUPLEX | DSP_CAP_REALTIME;
2041 for (idx = 0; idx < 2; idx++) {
2042 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
2043 result = snd_pcm_oss_get_caps1(substream, res: result);
2044 }
2045 result |= 0x0001; /* revision - same as SB AWE 64 */
2046 return result;
2047}
2048
2049static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
2050 snd_pcm_uframes_t hw_ptr)
2051{
2052 struct snd_pcm_runtime *runtime = substream->runtime;
2053 snd_pcm_uframes_t appl_ptr;
2054 appl_ptr = hw_ptr + runtime->buffer_size;
2055 appl_ptr %= runtime->boundary;
2056 runtime->control->appl_ptr = appl_ptr;
2057}
2058
2059static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger)
2060{
2061 struct snd_pcm_runtime *runtime;
2062 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2063 int err, cmd;
2064
2065#ifdef OSS_DEBUG
2066 pr_debug("pcm_oss: trigger = 0x%x\n", trigger);
2067#endif
2068
2069 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2070 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2071
2072 if (psubstream) {
2073 err = snd_pcm_oss_make_ready(substream: psubstream);
2074 if (err < 0)
2075 return err;
2076 }
2077 if (csubstream) {
2078 err = snd_pcm_oss_make_ready(substream: csubstream);
2079 if (err < 0)
2080 return err;
2081 }
2082 if (psubstream) {
2083 runtime = psubstream->runtime;
2084 cmd = 0;
2085 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2086 return -ERESTARTSYS;
2087 if (trigger & PCM_ENABLE_OUTPUT) {
2088 if (runtime->oss.trigger)
2089 goto _skip1;
2090 if (atomic_read(v: &psubstream->mmap_count))
2091 snd_pcm_oss_simulate_fill(substream: psubstream,
2092 hw_ptr: get_hw_ptr_period(runtime));
2093 runtime->oss.trigger = 1;
2094 runtime->start_threshold = 1;
2095 cmd = SNDRV_PCM_IOCTL_START;
2096 } else {
2097 if (!runtime->oss.trigger)
2098 goto _skip1;
2099 runtime->oss.trigger = 0;
2100 runtime->start_threshold = runtime->boundary;
2101 cmd = SNDRV_PCM_IOCTL_DROP;
2102 runtime->oss.prepare = 1;
2103 }
2104 _skip1:
2105 mutex_unlock(lock: &runtime->oss.params_lock);
2106 if (cmd) {
2107 err = snd_pcm_kernel_ioctl(substream: psubstream, cmd, NULL);
2108 if (err < 0)
2109 return err;
2110 }
2111 }
2112 if (csubstream) {
2113 runtime = csubstream->runtime;
2114 cmd = 0;
2115 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2116 return -ERESTARTSYS;
2117 if (trigger & PCM_ENABLE_INPUT) {
2118 if (runtime->oss.trigger)
2119 goto _skip2;
2120 runtime->oss.trigger = 1;
2121 runtime->start_threshold = 1;
2122 cmd = SNDRV_PCM_IOCTL_START;
2123 } else {
2124 if (!runtime->oss.trigger)
2125 goto _skip2;
2126 runtime->oss.trigger = 0;
2127 runtime->start_threshold = runtime->boundary;
2128 cmd = SNDRV_PCM_IOCTL_DROP;
2129 runtime->oss.prepare = 1;
2130 }
2131 _skip2:
2132 mutex_unlock(lock: &runtime->oss.params_lock);
2133 if (cmd) {
2134 err = snd_pcm_kernel_ioctl(substream: csubstream, cmd, NULL);
2135 if (err < 0)
2136 return err;
2137 }
2138 }
2139 return 0;
2140}
2141
2142static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file)
2143{
2144 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2145 int result = 0;
2146
2147 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2148 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2149 if (psubstream && psubstream->runtime && psubstream->runtime->oss.trigger)
2150 result |= PCM_ENABLE_OUTPUT;
2151 if (csubstream && csubstream->runtime && csubstream->runtime->oss.trigger)
2152 result |= PCM_ENABLE_INPUT;
2153 return result;
2154}
2155
2156static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file)
2157{
2158 struct snd_pcm_substream *substream;
2159 struct snd_pcm_runtime *runtime;
2160 snd_pcm_sframes_t delay;
2161 int err;
2162
2163 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2164 if (substream == NULL)
2165 return -EINVAL;
2166 err = snd_pcm_oss_make_ready(substream);
2167 if (err < 0)
2168 return err;
2169 runtime = substream->runtime;
2170 if (runtime->oss.params || runtime->oss.prepare)
2171 return 0;
2172 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, arg: &delay);
2173 if (err == -EPIPE)
2174 delay = 0; /* hack for broken OSS applications */
2175 else if (err < 0)
2176 return err;
2177 return snd_pcm_oss_bytes(substream, frames: delay);
2178}
2179
2180static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info)
2181{
2182 struct snd_pcm_substream *substream;
2183 struct snd_pcm_runtime *runtime;
2184 snd_pcm_sframes_t delay;
2185 int fixup;
2186 struct count_info info;
2187 int err;
2188
2189 if (_info == NULL)
2190 return -EFAULT;
2191 substream = pcm_oss_file->streams[stream];
2192 if (substream == NULL)
2193 return -EINVAL;
2194 err = snd_pcm_oss_make_ready(substream);
2195 if (err < 0)
2196 return err;
2197 runtime = substream->runtime;
2198 if (runtime->oss.params || runtime->oss.prepare) {
2199 memset(&info, 0, sizeof(info));
2200 if (copy_to_user(to: _info, from: &info, n: sizeof(info)))
2201 return -EFAULT;
2202 return 0;
2203 }
2204 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2205 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, arg: &delay);
2206 if (err == -EPIPE || err == -ESTRPIPE || (! err && delay < 0)) {
2207 err = 0;
2208 delay = 0;
2209 fixup = 0;
2210 } else {
2211 fixup = runtime->oss.buffer_used;
2212 }
2213 } else {
2214 err = snd_pcm_oss_capture_position_fixup(substream, delay: &delay);
2215 fixup = -runtime->oss.buffer_used;
2216 }
2217 if (err < 0)
2218 return err;
2219 info.ptr = snd_pcm_oss_bytes(substream, frames: runtime->status->hw_ptr % runtime->buffer_size);
2220 if (atomic_read(v: &substream->mmap_count)) {
2221 snd_pcm_sframes_t n;
2222 delay = get_hw_ptr_period(runtime);
2223 n = delay - runtime->oss.prev_hw_ptr_period;
2224 if (n < 0)
2225 n += runtime->boundary;
2226 info.blocks = n / runtime->period_size;
2227 runtime->oss.prev_hw_ptr_period = delay;
2228 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2229 snd_pcm_oss_simulate_fill(substream, hw_ptr: delay);
2230 info.bytes = snd_pcm_oss_bytes(substream, frames: runtime->status->hw_ptr) & INT_MAX;
2231 } else {
2232 delay = snd_pcm_oss_bytes(substream, frames: delay);
2233 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2234 if (substream->oss.setup.buggyptr)
2235 info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
2236 else
2237 info.blocks = (delay + fixup) / runtime->oss.period_bytes;
2238 info.bytes = (runtime->oss.bytes - delay) & INT_MAX;
2239 } else {
2240 delay += fixup;
2241 info.blocks = delay / runtime->oss.period_bytes;
2242 info.bytes = (runtime->oss.bytes + delay) & INT_MAX;
2243 }
2244 }
2245 if (copy_to_user(to: _info, from: &info, n: sizeof(info)))
2246 return -EFAULT;
2247 return 0;
2248}
2249
2250static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info)
2251{
2252 struct snd_pcm_substream *substream;
2253 struct snd_pcm_runtime *runtime;
2254 snd_pcm_sframes_t avail;
2255 int fixup;
2256 struct audio_buf_info info;
2257 int err;
2258
2259 if (_info == NULL)
2260 return -EFAULT;
2261 substream = pcm_oss_file->streams[stream];
2262 if (substream == NULL)
2263 return -EINVAL;
2264 runtime = substream->runtime;
2265
2266 if (runtime->oss.params) {
2267 err = snd_pcm_oss_change_params(substream, trylock: false);
2268 if (err < 0)
2269 return err;
2270 }
2271
2272 info.fragsize = runtime->oss.period_bytes;
2273 info.fragstotal = runtime->periods;
2274 if (runtime->oss.prepare) {
2275 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2276 info.bytes = runtime->oss.period_bytes * runtime->oss.periods;
2277 info.fragments = runtime->oss.periods;
2278 } else {
2279 info.bytes = 0;
2280 info.fragments = 0;
2281 }
2282 } else {
2283 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2284 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, arg: &avail);
2285 if (err == -EPIPE || err == -ESTRPIPE || (! err && avail < 0)) {
2286 avail = runtime->buffer_size;
2287 err = 0;
2288 fixup = 0;
2289 } else {
2290 avail = runtime->buffer_size - avail;
2291 fixup = -runtime->oss.buffer_used;
2292 }
2293 } else {
2294 err = snd_pcm_oss_capture_position_fixup(substream, delay: &avail);
2295 fixup = runtime->oss.buffer_used;
2296 }
2297 if (err < 0)
2298 return err;
2299 info.bytes = snd_pcm_oss_bytes(substream, frames: avail) + fixup;
2300 info.fragments = info.bytes / runtime->oss.period_bytes;
2301 }
2302
2303#ifdef OSS_DEBUG
2304 pcm_dbg(substream->pcm,
2305 "pcm_oss: space: bytes = %i, fragments = %i, fragstotal = %i, fragsize = %i\n",
2306 info.bytes, info.fragments, info.fragstotal, info.fragsize);
2307#endif
2308 if (copy_to_user(to: _info, from: &info, n: sizeof(info)))
2309 return -EFAULT;
2310 return 0;
2311}
2312
2313static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info)
2314{
2315 // it won't be probably implemented
2316 // pr_debug("TODO: snd_pcm_oss_get_mapbuf\n");
2317 return -EINVAL;
2318}
2319
2320static const char *strip_task_path(const char *path)
2321{
2322 const char *ptr, *ptrl = NULL;
2323 for (ptr = path; *ptr; ptr++) {
2324 if (*ptr == '/')
2325 ptrl = ptr + 1;
2326 }
2327 return ptrl;
2328}
2329
2330static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
2331 const char *task_name,
2332 struct snd_pcm_oss_setup *rsetup)
2333{
2334 struct snd_pcm_oss_setup *setup;
2335
2336 guard(mutex)(T: &pcm->streams[stream].oss.setup_mutex);
2337 do {
2338 for (setup = pcm->streams[stream].oss.setup_list; setup;
2339 setup = setup->next) {
2340 if (!strcmp(setup->task_name, task_name))
2341 goto out;
2342 }
2343 } while ((task_name = strip_task_path(path: task_name)) != NULL);
2344 out:
2345 if (setup)
2346 *rsetup = *setup;
2347}
2348
2349static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream)
2350{
2351 snd_pcm_oss_release_buffers(substream);
2352 substream->oss.oss = 0;
2353}
2354
2355static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
2356 struct snd_pcm_oss_setup *setup,
2357 int minor)
2358{
2359 struct snd_pcm_runtime *runtime;
2360
2361 substream->oss.oss = 1;
2362 substream->oss.setup = *setup;
2363 if (setup->nonblock)
2364 substream->f_flags |= O_NONBLOCK;
2365 else if (setup->block)
2366 substream->f_flags &= ~O_NONBLOCK;
2367 runtime = substream->runtime;
2368 runtime->oss.params = 1;
2369 runtime->oss.trigger = 1;
2370 runtime->oss.rate = 8000;
2371 mutex_init(&runtime->oss.params_lock);
2372 switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
2373 case SNDRV_MINOR_OSS_PCM_8:
2374 runtime->oss.format = AFMT_U8;
2375 break;
2376 case SNDRV_MINOR_OSS_PCM_16:
2377 runtime->oss.format = AFMT_S16_LE;
2378 break;
2379 default:
2380 runtime->oss.format = AFMT_MU_LAW;
2381 }
2382 runtime->oss.channels = 1;
2383 runtime->oss.fragshift = 0;
2384 runtime->oss.maxfrags = 0;
2385 runtime->oss.subdivision = 0;
2386 substream->pcm_release = snd_pcm_oss_release_substream;
2387 atomic_set(v: &runtime->oss.rw_ref, i: 0);
2388}
2389
2390static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file)
2391{
2392 int cidx;
2393 if (!pcm_oss_file)
2394 return 0;
2395 for (cidx = 0; cidx < 2; ++cidx) {
2396 struct snd_pcm_substream *substream = pcm_oss_file->streams[cidx];
2397 if (substream)
2398 snd_pcm_release_substream(substream);
2399 }
2400 kfree(objp: pcm_oss_file);
2401 return 0;
2402}
2403
2404static int snd_pcm_oss_open_file(struct file *file,
2405 struct snd_pcm *pcm,
2406 struct snd_pcm_oss_file **rpcm_oss_file,
2407 int minor,
2408 struct snd_pcm_oss_setup *setup)
2409{
2410 int idx, err;
2411 struct snd_pcm_oss_file *pcm_oss_file;
2412 struct snd_pcm_substream *substream;
2413 fmode_t f_mode = file->f_mode;
2414
2415 if (rpcm_oss_file)
2416 *rpcm_oss_file = NULL;
2417
2418 pcm_oss_file = kzalloc(sizeof(*pcm_oss_file), GFP_KERNEL);
2419 if (pcm_oss_file == NULL)
2420 return -ENOMEM;
2421
2422 if ((f_mode & (FMODE_WRITE|FMODE_READ)) == (FMODE_WRITE|FMODE_READ) &&
2423 (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX))
2424 f_mode = FMODE_WRITE;
2425
2426 file->f_flags &= ~O_APPEND;
2427 for (idx = 0; idx < 2; idx++) {
2428 if (setup[idx].disable)
2429 continue;
2430 if (! pcm->streams[idx].substream_count)
2431 continue; /* no matching substream */
2432 if (idx == SNDRV_PCM_STREAM_PLAYBACK) {
2433 if (! (f_mode & FMODE_WRITE))
2434 continue;
2435 } else {
2436 if (! (f_mode & FMODE_READ))
2437 continue;
2438 }
2439 err = snd_pcm_open_substream(pcm, stream: idx, file, rsubstream: &substream);
2440 if (err < 0) {
2441 snd_pcm_oss_release_file(pcm_oss_file);
2442 return err;
2443 }
2444
2445 pcm_oss_file->streams[idx] = substream;
2446 snd_pcm_oss_init_substream(substream, setup: &setup[idx], minor);
2447 }
2448
2449 if (!pcm_oss_file->streams[0] && !pcm_oss_file->streams[1]) {
2450 snd_pcm_oss_release_file(pcm_oss_file);
2451 return -EINVAL;
2452 }
2453
2454 file->private_data = pcm_oss_file;
2455 if (rpcm_oss_file)
2456 *rpcm_oss_file = pcm_oss_file;
2457 return 0;
2458}
2459
2460
2461static int snd_task_name(struct task_struct *task, char *name, size_t size)
2462{
2463 unsigned int idx;
2464
2465 if (snd_BUG_ON(!task || !name || size < 2))
2466 return -EINVAL;
2467 for (idx = 0; idx < sizeof(task->comm) && idx + 1 < size; idx++)
2468 name[idx] = task->comm[idx];
2469 name[idx] = '\0';
2470 return 0;
2471}
2472
2473static int snd_pcm_oss_open(struct inode *inode, struct file *file)
2474{
2475 int err;
2476 char task_name[32];
2477 struct snd_pcm *pcm;
2478 struct snd_pcm_oss_file *pcm_oss_file;
2479 struct snd_pcm_oss_setup setup[2];
2480 int nonblock;
2481 wait_queue_entry_t wait;
2482
2483 err = nonseekable_open(inode, filp: file);
2484 if (err < 0)
2485 return err;
2486
2487 pcm = snd_lookup_oss_minor_data(minor: iminor(inode),
2488 SNDRV_OSS_DEVICE_TYPE_PCM);
2489 if (pcm == NULL) {
2490 err = -ENODEV;
2491 goto __error1;
2492 }
2493 err = snd_card_file_add(card: pcm->card, file);
2494 if (err < 0)
2495 goto __error1;
2496 if (!try_module_get(module: pcm->card->module)) {
2497 err = -EFAULT;
2498 goto __error2;
2499 }
2500 if (snd_task_name(current, name: task_name, size: sizeof(task_name)) < 0) {
2501 err = -EFAULT;
2502 goto __error;
2503 }
2504 memset(setup, 0, sizeof(setup));
2505 if (file->f_mode & FMODE_WRITE)
2506 snd_pcm_oss_look_for_setup(pcm, stream: SNDRV_PCM_STREAM_PLAYBACK,
2507 task_name, rsetup: &setup[0]);
2508 if (file->f_mode & FMODE_READ)
2509 snd_pcm_oss_look_for_setup(pcm, stream: SNDRV_PCM_STREAM_CAPTURE,
2510 task_name, rsetup: &setup[1]);
2511
2512 nonblock = !!(file->f_flags & O_NONBLOCK);
2513 if (!nonblock)
2514 nonblock = nonblock_open;
2515
2516 init_waitqueue_entry(wq_entry: &wait, current);
2517 add_wait_queue(wq_head: &pcm->open_wait, wq_entry: &wait);
2518 mutex_lock(&pcm->open_mutex);
2519 while (1) {
2520 err = snd_pcm_oss_open_file(file, pcm, rpcm_oss_file: &pcm_oss_file,
2521 minor: iminor(inode), setup);
2522 if (err >= 0)
2523 break;
2524 if (err == -EAGAIN) {
2525 if (nonblock) {
2526 err = -EBUSY;
2527 break;
2528 }
2529 } else
2530 break;
2531 set_current_state(TASK_INTERRUPTIBLE);
2532 mutex_unlock(lock: &pcm->open_mutex);
2533 schedule();
2534 mutex_lock(&pcm->open_mutex);
2535 if (pcm->card->shutdown) {
2536 err = -ENODEV;
2537 break;
2538 }
2539 if (signal_pending(current)) {
2540 err = -ERESTARTSYS;
2541 break;
2542 }
2543 }
2544 remove_wait_queue(wq_head: &pcm->open_wait, wq_entry: &wait);
2545 mutex_unlock(lock: &pcm->open_mutex);
2546 if (err < 0)
2547 goto __error;
2548 snd_card_unref(card: pcm->card);
2549 return err;
2550
2551 __error:
2552 module_put(module: pcm->card->module);
2553 __error2:
2554 snd_card_file_remove(card: pcm->card, file);
2555 __error1:
2556 if (pcm)
2557 snd_card_unref(card: pcm->card);
2558 return err;
2559}
2560
2561static int snd_pcm_oss_release(struct inode *inode, struct file *file)
2562{
2563 struct snd_pcm *pcm;
2564 struct snd_pcm_substream *substream;
2565 struct snd_pcm_oss_file *pcm_oss_file;
2566
2567 pcm_oss_file = file->private_data;
2568 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2569 if (substream == NULL)
2570 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2571 if (snd_BUG_ON(!substream))
2572 return -ENXIO;
2573 pcm = substream->pcm;
2574 if (!pcm->card->shutdown)
2575 snd_pcm_oss_sync(pcm_oss_file);
2576 mutex_lock(&pcm->open_mutex);
2577 snd_pcm_oss_release_file(pcm_oss_file);
2578 mutex_unlock(lock: &pcm->open_mutex);
2579 wake_up(&pcm->open_wait);
2580 module_put(module: pcm->card->module);
2581 snd_card_file_remove(card: pcm->card, file);
2582 return 0;
2583}
2584
2585static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2586{
2587 struct snd_pcm_oss_file *pcm_oss_file;
2588 int __user *p = (int __user *)arg;
2589 int res;
2590
2591 pcm_oss_file = file->private_data;
2592 if (cmd == OSS_GETVERSION)
2593 return put_user(SNDRV_OSS_VERSION, p);
2594 if (cmd == OSS_ALSAEMULVER)
2595 return put_user(1, p);
2596#if IS_REACHABLE(CONFIG_SND_MIXER_OSS)
2597 if (((cmd >> 8) & 0xff) == 'M') { /* mixer ioctl - for OSS compatibility */
2598 struct snd_pcm_substream *substream;
2599 int idx;
2600 for (idx = 0; idx < 2; ++idx) {
2601 substream = pcm_oss_file->streams[idx];
2602 if (substream != NULL)
2603 break;
2604 }
2605 if (snd_BUG_ON(idx >= 2))
2606 return -ENXIO;
2607 return snd_mixer_oss_ioctl_card(card: substream->pcm->card, cmd, arg);
2608 }
2609#endif
2610 if (((cmd >> 8) & 0xff) != 'P')
2611 return -EINVAL;
2612#ifdef OSS_DEBUG
2613 pr_debug("pcm_oss: ioctl = 0x%x\n", cmd);
2614#endif
2615 switch (cmd) {
2616 case SNDCTL_DSP_RESET:
2617 return snd_pcm_oss_reset(pcm_oss_file);
2618 case SNDCTL_DSP_SYNC:
2619 return snd_pcm_oss_sync(pcm_oss_file);
2620 case SNDCTL_DSP_SPEED:
2621 if (get_user(res, p))
2622 return -EFAULT;
2623 res = snd_pcm_oss_set_rate(pcm_oss_file, rate: res);
2624 if (res < 0)
2625 return res;
2626 return put_user(res, p);
2627 case SOUND_PCM_READ_RATE:
2628 res = snd_pcm_oss_get_rate(pcm_oss_file);
2629 if (res < 0)
2630 return res;
2631 return put_user(res, p);
2632 case SNDCTL_DSP_STEREO:
2633 if (get_user(res, p))
2634 return -EFAULT;
2635 res = res > 0 ? 2 : 1;
2636 res = snd_pcm_oss_set_channels(pcm_oss_file, channels: res);
2637 if (res < 0)
2638 return res;
2639 return put_user(--res, p);
2640 case SNDCTL_DSP_GETBLKSIZE:
2641 res = snd_pcm_oss_get_block_size(pcm_oss_file);
2642 if (res < 0)
2643 return res;
2644 return put_user(res, p);
2645 case SNDCTL_DSP_SETFMT:
2646 if (get_user(res, p))
2647 return -EFAULT;
2648 res = snd_pcm_oss_set_format(pcm_oss_file, format: res);
2649 if (res < 0)
2650 return res;
2651 return put_user(res, p);
2652 case SOUND_PCM_READ_BITS:
2653 res = snd_pcm_oss_get_format(pcm_oss_file);
2654 if (res < 0)
2655 return res;
2656 return put_user(res, p);
2657 case SNDCTL_DSP_CHANNELS:
2658 if (get_user(res, p))
2659 return -EFAULT;
2660 res = snd_pcm_oss_set_channels(pcm_oss_file, channels: res);
2661 if (res < 0)
2662 return res;
2663 return put_user(res, p);
2664 case SOUND_PCM_READ_CHANNELS:
2665 res = snd_pcm_oss_get_channels(pcm_oss_file);
2666 if (res < 0)
2667 return res;
2668 return put_user(res, p);
2669 case SOUND_PCM_WRITE_FILTER:
2670 case SOUND_PCM_READ_FILTER:
2671 return -EIO;
2672 case SNDCTL_DSP_POST:
2673 return snd_pcm_oss_post(pcm_oss_file);
2674 case SNDCTL_DSP_SUBDIVIDE:
2675 if (get_user(res, p))
2676 return -EFAULT;
2677 res = snd_pcm_oss_set_subdivide(pcm_oss_file, subdivide: res);
2678 if (res < 0)
2679 return res;
2680 return put_user(res, p);
2681 case SNDCTL_DSP_SETFRAGMENT:
2682 if (get_user(res, p))
2683 return -EFAULT;
2684 return snd_pcm_oss_set_fragment(pcm_oss_file, val: res);
2685 case SNDCTL_DSP_GETFMTS:
2686 res = snd_pcm_oss_get_formats(pcm_oss_file);
2687 if (res < 0)
2688 return res;
2689 return put_user(res, p);
2690 case SNDCTL_DSP_GETOSPACE:
2691 case SNDCTL_DSP_GETISPACE:
2692 return snd_pcm_oss_get_space(pcm_oss_file,
2693 stream: cmd == SNDCTL_DSP_GETISPACE ?
2694 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2695 info: (struct audio_buf_info __user *) arg);
2696 case SNDCTL_DSP_NONBLOCK:
2697 return snd_pcm_oss_nonblock(file);
2698 case SNDCTL_DSP_GETCAPS:
2699 res = snd_pcm_oss_get_caps(pcm_oss_file);
2700 if (res < 0)
2701 return res;
2702 return put_user(res, p);
2703 case SNDCTL_DSP_GETTRIGGER:
2704 res = snd_pcm_oss_get_trigger(pcm_oss_file);
2705 if (res < 0)
2706 return res;
2707 return put_user(res, p);
2708 case SNDCTL_DSP_SETTRIGGER:
2709 if (get_user(res, p))
2710 return -EFAULT;
2711 return snd_pcm_oss_set_trigger(pcm_oss_file, trigger: res);
2712 case SNDCTL_DSP_GETIPTR:
2713 case SNDCTL_DSP_GETOPTR:
2714 return snd_pcm_oss_get_ptr(pcm_oss_file,
2715 stream: cmd == SNDCTL_DSP_GETIPTR ?
2716 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2717 info: (struct count_info __user *) arg);
2718 case SNDCTL_DSP_MAPINBUF:
2719 case SNDCTL_DSP_MAPOUTBUF:
2720 return snd_pcm_oss_get_mapbuf(pcm_oss_file,
2721 stream: cmd == SNDCTL_DSP_MAPINBUF ?
2722 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2723 info: (struct buffmem_desc __user *) arg);
2724 case SNDCTL_DSP_SETSYNCRO:
2725 /* stop DMA now.. */
2726 return 0;
2727 case SNDCTL_DSP_SETDUPLEX:
2728 if (snd_pcm_oss_get_caps(pcm_oss_file) & DSP_CAP_DUPLEX)
2729 return 0;
2730 return -EIO;
2731 case SNDCTL_DSP_GETODELAY:
2732 res = snd_pcm_oss_get_odelay(pcm_oss_file);
2733 if (res < 0) {
2734 /* it's for sure, some broken apps don't check for error codes */
2735 put_user(0, p);
2736 return res;
2737 }
2738 return put_user(res, p);
2739 case SNDCTL_DSP_PROFILE:
2740 return 0; /* silently ignore */
2741 default:
2742 pr_debug("pcm_oss: unknown command = 0x%x\n", cmd);
2743 }
2744 return -EINVAL;
2745}
2746
2747#ifdef CONFIG_COMPAT
2748/* all compatible */
2749static long snd_pcm_oss_ioctl_compat(struct file *file, unsigned int cmd,
2750 unsigned long arg)
2751{
2752 /*
2753 * Everything is compatbile except SNDCTL_DSP_MAPINBUF/SNDCTL_DSP_MAPOUTBUF,
2754 * which are not implemented for the native case either
2755 */
2756 return snd_pcm_oss_ioctl(file, cmd, arg: (unsigned long)compat_ptr(uptr: arg));
2757}
2758#else
2759#define snd_pcm_oss_ioctl_compat NULL
2760#endif
2761
2762static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
2763{
2764 struct snd_pcm_oss_file *pcm_oss_file;
2765 struct snd_pcm_substream *substream;
2766
2767 pcm_oss_file = file->private_data;
2768 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2769 if (substream == NULL)
2770 return -ENXIO;
2771 substream->f_flags = file->f_flags & O_NONBLOCK;
2772#ifndef OSS_DEBUG
2773 return snd_pcm_oss_read1(substream, buf, bytes: count);
2774#else
2775 {
2776 ssize_t res = snd_pcm_oss_read1(substream, buf, count);
2777 pcm_dbg(substream->pcm,
2778 "pcm_oss: read %li bytes (returned %li bytes)\n",
2779 (long)count, (long)res);
2780 return res;
2781 }
2782#endif
2783}
2784
2785static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
2786{
2787 struct snd_pcm_oss_file *pcm_oss_file;
2788 struct snd_pcm_substream *substream;
2789 long result;
2790
2791 pcm_oss_file = file->private_data;
2792 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2793 if (substream == NULL)
2794 return -ENXIO;
2795 substream->f_flags = file->f_flags & O_NONBLOCK;
2796 result = snd_pcm_oss_write1(substream, buf, bytes: count);
2797#ifdef OSS_DEBUG
2798 pcm_dbg(substream->pcm, "pcm_oss: write %li bytes (wrote %li bytes)\n",
2799 (long)count, (long)result);
2800#endif
2801 return result;
2802}
2803
2804static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)
2805{
2806 struct snd_pcm_runtime *runtime = substream->runtime;
2807 if (atomic_read(v: &substream->mmap_count))
2808 return runtime->oss.prev_hw_ptr_period !=
2809 get_hw_ptr_period(runtime);
2810 else
2811 return snd_pcm_playback_avail(runtime) >=
2812 runtime->oss.period_frames;
2813}
2814
2815static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)
2816{
2817 struct snd_pcm_runtime *runtime = substream->runtime;
2818 if (atomic_read(v: &substream->mmap_count))
2819 return runtime->oss.prev_hw_ptr_period !=
2820 get_hw_ptr_period(runtime);
2821 else
2822 return snd_pcm_capture_avail(runtime) >=
2823 runtime->oss.period_frames;
2824}
2825
2826static __poll_t snd_pcm_oss_poll(struct file *file, poll_table * wait)
2827{
2828 struct snd_pcm_oss_file *pcm_oss_file;
2829 __poll_t mask;
2830 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2831
2832 pcm_oss_file = file->private_data;
2833
2834 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2835 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2836
2837 mask = 0;
2838 if (psubstream != NULL) {
2839 struct snd_pcm_runtime *runtime = psubstream->runtime;
2840 poll_wait(filp: file, wait_address: &runtime->sleep, p: wait);
2841 scoped_guard(pcm_stream_lock_irq, psubstream) {
2842 if (runtime->state != SNDRV_PCM_STATE_DRAINING &&
2843 (runtime->state != SNDRV_PCM_STATE_RUNNING ||
2844 snd_pcm_oss_playback_ready(substream: psubstream)))
2845 mask |= EPOLLOUT | EPOLLWRNORM;
2846 }
2847 }
2848 if (csubstream != NULL) {
2849 struct snd_pcm_runtime *runtime = csubstream->runtime;
2850 snd_pcm_state_t ostate;
2851 poll_wait(filp: file, wait_address: &runtime->sleep, p: wait);
2852 scoped_guard(pcm_stream_lock_irq, csubstream) {
2853 ostate = runtime->state;
2854 if (ostate != SNDRV_PCM_STATE_RUNNING ||
2855 snd_pcm_oss_capture_ready(substream: csubstream))
2856 mask |= EPOLLIN | EPOLLRDNORM;
2857 }
2858 if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) {
2859 struct snd_pcm_oss_file ofile;
2860 memset(&ofile, 0, sizeof(ofile));
2861 ofile.streams[SNDRV_PCM_STREAM_CAPTURE] = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2862 runtime->oss.trigger = 0;
2863 snd_pcm_oss_set_trigger(pcm_oss_file: &ofile, PCM_ENABLE_INPUT);
2864 }
2865 }
2866
2867 return mask;
2868}
2869
2870static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area)
2871{
2872 struct snd_pcm_oss_file *pcm_oss_file;
2873 struct snd_pcm_substream *substream = NULL;
2874 struct snd_pcm_runtime *runtime;
2875 int err;
2876
2877#ifdef OSS_DEBUG
2878 pr_debug("pcm_oss: mmap begin\n");
2879#endif
2880 pcm_oss_file = file->private_data;
2881 switch ((area->vm_flags & (VM_READ | VM_WRITE))) {
2882 case VM_READ | VM_WRITE:
2883 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2884 if (substream)
2885 break;
2886 fallthrough;
2887 case VM_READ:
2888 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2889 break;
2890 case VM_WRITE:
2891 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2892 break;
2893 default:
2894 return -EINVAL;
2895 }
2896 /* set VM_READ access as well to fix memset() routines that do
2897 reads before writes (to improve performance) */
2898 vm_flags_set(vma: area, VM_READ);
2899 if (substream == NULL)
2900 return -ENXIO;
2901 runtime = substream->runtime;
2902 if (!(runtime->info & SNDRV_PCM_INFO_MMAP_VALID))
2903 return -EIO;
2904 if (runtime->info & SNDRV_PCM_INFO_INTERLEAVED)
2905 runtime->access = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2906 else
2907 return -EIO;
2908
2909 if (runtime->oss.params) {
2910 /* use mutex_trylock() for params_lock for avoiding a deadlock
2911 * between mmap_lock and params_lock taken by
2912 * copy_from/to_user() in snd_pcm_oss_write/read()
2913 */
2914 err = snd_pcm_oss_change_params(substream, trylock: true);
2915 if (err < 0)
2916 return err;
2917 }
2918#ifdef CONFIG_SND_PCM_OSS_PLUGINS
2919 if (runtime->oss.plugin_first != NULL)
2920 return -EIO;
2921#endif
2922
2923 if (area->vm_pgoff != 0)
2924 return -EINVAL;
2925
2926 err = snd_pcm_mmap_data(substream, file, area);
2927 if (err < 0)
2928 return err;
2929 runtime->oss.mmap_bytes = area->vm_end - area->vm_start;
2930 runtime->silence_threshold = 0;
2931 runtime->silence_size = 0;
2932#ifdef OSS_DEBUG
2933 pr_debug("pcm_oss: mmap ok, bytes = 0x%x\n",
2934 runtime->oss.mmap_bytes);
2935#endif
2936 /* In mmap mode we never stop */
2937 runtime->stop_threshold = runtime->boundary;
2938
2939 return 0;
2940}
2941
2942#ifdef CONFIG_SND_VERBOSE_PROCFS
2943/*
2944 * /proc interface
2945 */
2946
2947static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
2948 struct snd_info_buffer *buffer)
2949{
2950 struct snd_pcm_str *pstr = entry->private_data;
2951 struct snd_pcm_oss_setup *setup = pstr->oss.setup_list;
2952 guard(mutex)(T: &pstr->oss.setup_mutex);
2953 while (setup) {
2954 snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s\n",
2955 setup->task_name,
2956 setup->periods,
2957 setup->period_size,
2958 setup->disable ? " disable" : "",
2959 setup->direct ? " direct" : "",
2960 setup->block ? " block" : "",
2961 setup->nonblock ? " non-block" : "",
2962 setup->partialfrag ? " partial-frag" : "",
2963 setup->nosilence ? " no-silence" : "");
2964 setup = setup->next;
2965 }
2966}
2967
2968static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)
2969{
2970 struct snd_pcm_oss_setup *setup, *setupn;
2971
2972 for (setup = pstr->oss.setup_list, pstr->oss.setup_list = NULL;
2973 setup; setup = setupn) {
2974 setupn = setup->next;
2975 kfree(objp: setup->task_name);
2976 kfree(objp: setup);
2977 }
2978 pstr->oss.setup_list = NULL;
2979}
2980
2981static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
2982 struct snd_info_buffer *buffer)
2983{
2984 struct snd_pcm_str *pstr = entry->private_data;
2985 char line[128], str[32], task_name[32];
2986 const char *ptr;
2987 int idx1;
2988 struct snd_pcm_oss_setup *setup, *setup1, template;
2989
2990 while (!snd_info_get_line(buffer, line, len: sizeof(line))) {
2991 guard(mutex)(T: &pstr->oss.setup_mutex);
2992 memset(&template, 0, sizeof(template));
2993 ptr = snd_info_get_str(dest: task_name, src: line, len: sizeof(task_name));
2994 if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) {
2995 snd_pcm_oss_proc_free_setup_list(pstr);
2996 continue;
2997 }
2998 for (setup = pstr->oss.setup_list; setup; setup = setup->next) {
2999 if (!strcmp(setup->task_name, task_name)) {
3000 template = *setup;
3001 break;
3002 }
3003 }
3004 ptr = snd_info_get_str(dest: str, src: ptr, len: sizeof(str));
3005 template.periods = simple_strtoul(str, NULL, 10);
3006 ptr = snd_info_get_str(dest: str, src: ptr, len: sizeof(str));
3007 template.period_size = simple_strtoul(str, NULL, 10);
3008 for (idx1 = 31; idx1 >= 0; idx1--)
3009 if (template.period_size & (1 << idx1))
3010 break;
3011 for (idx1--; idx1 >= 0; idx1--)
3012 template.period_size &= ~(1 << idx1);
3013 do {
3014 ptr = snd_info_get_str(dest: str, src: ptr, len: sizeof(str));
3015 if (!strcmp(str, "disable")) {
3016 template.disable = 1;
3017 } else if (!strcmp(str, "direct")) {
3018 template.direct = 1;
3019 } else if (!strcmp(str, "block")) {
3020 template.block = 1;
3021 } else if (!strcmp(str, "non-block")) {
3022 template.nonblock = 1;
3023 } else if (!strcmp(str, "partial-frag")) {
3024 template.partialfrag = 1;
3025 } else if (!strcmp(str, "no-silence")) {
3026 template.nosilence = 1;
3027 } else if (!strcmp(str, "buggy-ptr")) {
3028 template.buggyptr = 1;
3029 }
3030 } while (*str);
3031 if (setup == NULL) {
3032 setup = kmalloc(sizeof(*setup), GFP_KERNEL);
3033 if (! setup) {
3034 buffer->error = -ENOMEM;
3035 return;
3036 }
3037 if (pstr->oss.setup_list == NULL)
3038 pstr->oss.setup_list = setup;
3039 else {
3040 for (setup1 = pstr->oss.setup_list;
3041 setup1->next; setup1 = setup1->next);
3042 setup1->next = setup;
3043 }
3044 template.task_name = kstrdup(s: task_name, GFP_KERNEL);
3045 if (! template.task_name) {
3046 kfree(objp: setup);
3047 buffer->error = -ENOMEM;
3048 return;
3049 }
3050 }
3051 *setup = template;
3052 }
3053}
3054
3055static void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3056{
3057 int stream;
3058 for (stream = 0; stream < 2; ++stream) {
3059 struct snd_info_entry *entry;
3060 struct snd_pcm_str *pstr = &pcm->streams[stream];
3061 if (pstr->substream_count == 0)
3062 continue;
3063 entry = snd_info_create_card_entry(card: pcm->card, name: "oss", parent: pstr->proc_root);
3064 if (entry) {
3065 entry->content = SNDRV_INFO_CONTENT_TEXT;
3066 entry->mode = S_IFREG | 0644;
3067 entry->c.text.read = snd_pcm_oss_proc_read;
3068 entry->c.text.write = snd_pcm_oss_proc_write;
3069 entry->private_data = pstr;
3070 if (snd_info_register(entry) < 0) {
3071 snd_info_free_entry(entry);
3072 entry = NULL;
3073 }
3074 }
3075 pstr->oss.proc_entry = entry;
3076 }
3077}
3078
3079static void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3080{
3081 int stream;
3082 for (stream = 0; stream < 2; ++stream) {
3083 struct snd_pcm_str *pstr = &pcm->streams[stream];
3084 snd_info_free_entry(entry: pstr->oss.proc_entry);
3085 pstr->oss.proc_entry = NULL;
3086 snd_pcm_oss_proc_free_setup_list(pstr);
3087 }
3088}
3089#else /* !CONFIG_SND_VERBOSE_PROCFS */
3090static inline void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3091{
3092}
3093static inline void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3094{
3095}
3096#endif /* CONFIG_SND_VERBOSE_PROCFS */
3097
3098/*
3099 * ENTRY functions
3100 */
3101
3102static const struct file_operations snd_pcm_oss_f_reg =
3103{
3104 .owner = THIS_MODULE,
3105 .read = snd_pcm_oss_read,
3106 .write = snd_pcm_oss_write,
3107 .open = snd_pcm_oss_open,
3108 .release = snd_pcm_oss_release,
3109 .poll = snd_pcm_oss_poll,
3110 .unlocked_ioctl = snd_pcm_oss_ioctl,
3111 .compat_ioctl = snd_pcm_oss_ioctl_compat,
3112 .mmap = snd_pcm_oss_mmap,
3113};
3114
3115static void register_oss_dsp(struct snd_pcm *pcm, int index)
3116{
3117 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3118 card: pcm->card, dev: index, f_ops: &snd_pcm_oss_f_reg,
3119 private_data: pcm) < 0) {
3120 pcm_err(pcm, "unable to register OSS PCM device %i:%i\n",
3121 pcm->card->number, pcm->device);
3122 }
3123}
3124
3125static int snd_pcm_oss_register_minor(struct snd_pcm *pcm)
3126{
3127 pcm->oss.reg = 0;
3128 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3129 char name[128];
3130 int duplex;
3131 register_oss_dsp(pcm, index: 0);
3132 duplex = (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count > 0 &&
3133 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count &&
3134 !(pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX));
3135 sprintf(buf: name, fmt: "%s%s", pcm->name, duplex ? " (DUPLEX)" : "");
3136#ifdef SNDRV_OSS_INFO_DEV_AUDIO
3137 snd_oss_info_register(SNDRV_OSS_INFO_DEV_AUDIO,
3138 num: pcm->card->number,
3139 string: name);
3140#endif
3141 pcm->oss.reg++;
3142 pcm->oss.reg_mask |= 1;
3143 }
3144 if (adsp_map[pcm->card->number] == (int)pcm->device) {
3145 register_oss_dsp(pcm, index: 1);
3146 pcm->oss.reg++;
3147 pcm->oss.reg_mask |= 2;
3148 }
3149
3150 if (pcm->oss.reg)
3151 snd_pcm_oss_proc_init(pcm);
3152
3153 return 0;
3154}
3155
3156static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm)
3157{
3158 if (pcm->oss.reg) {
3159 if (pcm->oss.reg_mask & 1) {
3160 pcm->oss.reg_mask &= ~1;
3161 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3162 card: pcm->card, dev: 0);
3163 }
3164 if (pcm->oss.reg_mask & 2) {
3165 pcm->oss.reg_mask &= ~2;
3166 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3167 card: pcm->card, dev: 1);
3168 }
3169 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3170#ifdef SNDRV_OSS_INFO_DEV_AUDIO
3171 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number);
3172#endif
3173 }
3174 pcm->oss.reg = 0;
3175 }
3176 return 0;
3177}
3178
3179static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm)
3180{
3181 snd_pcm_oss_disconnect_minor(pcm);
3182 snd_pcm_oss_proc_done(pcm);
3183 return 0;
3184}
3185
3186static struct snd_pcm_notify snd_pcm_oss_notify =
3187{
3188 .n_register = snd_pcm_oss_register_minor,
3189 .n_disconnect = snd_pcm_oss_disconnect_minor,
3190 .n_unregister = snd_pcm_oss_unregister_minor,
3191};
3192
3193static int __init alsa_pcm_oss_init(void)
3194{
3195 int i;
3196 int err;
3197
3198 /* check device map table */
3199 for (i = 0; i < SNDRV_CARDS; i++) {
3200 if (dsp_map[i] < 0 || dsp_map[i] >= SNDRV_PCM_DEVICES) {
3201 pr_err("ALSA: pcm_oss: invalid dsp_map[%d] = %d\n",
3202 i, dsp_map[i]);
3203 dsp_map[i] = 0;
3204 }
3205 if (adsp_map[i] < 0 || adsp_map[i] >= SNDRV_PCM_DEVICES) {
3206 pr_err("ALSA: pcm_oss: invalid adsp_map[%d] = %d\n",
3207 i, adsp_map[i]);
3208 adsp_map[i] = 1;
3209 }
3210 }
3211 err = snd_pcm_notify(notify: &snd_pcm_oss_notify, nfree: 0);
3212 if (err < 0)
3213 return err;
3214 return 0;
3215}
3216
3217static void __exit alsa_pcm_oss_exit(void)
3218{
3219 snd_pcm_notify(notify: &snd_pcm_oss_notify, nfree: 1);
3220}
3221
3222module_init(alsa_pcm_oss_init)
3223module_exit(alsa_pcm_oss_exit)
3224

source code of linux/sound/core/oss/pcm_oss.c