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, &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(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(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(hw_param_mask(params, var), val);
174	if (changed > 0) {
175		params->cmask |= 1 << var;
176		params->rmask |= 1 << var;
177	}
178	return changed;
179}
180
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(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(hw_param_mask(params, var),
215					      val + !!open);
216	else if (hw_is_interval(var))
217		changed = snd_interval_refine_min(hw_param_interval(params, var),
218						  val, open);
219	else
220		return -EINVAL;
221	if (changed > 0) {
222		params->cmask |= 1 << var;
223		params->rmask |= 1 << var;
224	}
225	return changed;
226}
227
228/**
229 * snd_pcm_hw_param_min
230 * @pcm: PCM instance
231 * @params: the hw_params instance
232 * @var: parameter to retrieve
233 * @val: minimal value
234 * @dir: pointer to the direction (-1,0,1) or NULL
235 *
236 * Inside configuration space defined by PARAMS remove from PAR all
237 * values < VAL. Reduce configuration space accordingly.
238 * Return new minimum or -EINVAL if the configuration space is empty
239 */
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 : 0);
246	if (changed < 0)
247		return changed;
248	if (params->rmask) {
249		int err = snd_pcm_hw_refine(pcm, params);
250		if (err < 0)
251			return err;
252	}
253	return snd_pcm_hw_param_value_min(params, var, dir);
254}
255
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(hw_param_mask(params, var));
273			changed = -EINVAL;
274		} else
275			changed = snd_mask_refine_max(hw_param_mask(params, var),
276						      val - !!open);
277	} else if (hw_is_interval(var))
278		changed = snd_interval_refine_max(hw_param_interval(params, var),
279						  val, open);
280	else
281		return -EINVAL;
282	if (changed > 0) {
283		params->cmask |= 1 << var;
284		params->rmask |= 1 << var;
285	}
286	return changed;
287}
288
289/**
290 * snd_pcm_hw_param_max
291 * @pcm: PCM instance
292 * @params: the hw_params instance
293 * @var: parameter to retrieve
294 * @val: maximal value
295 * @dir: pointer to the direction (-1,0,1) or NULL
296 *
297 * Inside configuration space defined by PARAMS remove from PAR all
298 *  values >= VAL + 1. Reduce configuration space accordingly.
299 *  Return new maximum or -EINVAL if the configuration space is empty
300 */
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 : 0);
307	if (changed < 0)
308		return changed;
309	if (params->rmask) {
310		int err = snd_pcm_hw_refine(pcm, params);
311		if (err < 0)
312			return err;
313	}
314	return snd_pcm_hw_param_value_max(params, var, dir);
315}
316
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(best, bestdir, min, mindir, &dmin, &dmindir);
357	boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
358	return boundary_lt(dmin, dmindir, dmax, dmaxdir);
359}
360
361/**
362 * snd_pcm_hw_param_near
363 * @pcm: PCM instance
364 * @params: the hw_params instance
365 * @var: parameter to retrieve
366 * @best: value to set
367 * @dir: pointer to the direction (-1,0,1) or NULL
368 *
369 * Inside configuration space defined by PARAMS set PAR to the available value
370 * nearest to VAL. Reduce configuration space accordingly.
371 * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
372 * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
373 * Return the value found.
374  */
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 = NULL;
381	int v;
382	unsigned int saved_min;
383	int last = 0;
384	int min, max;
385	int mindir, maxdir;
386	int valdir = dir ? *dir : 0;
387	/* FIXME */
388	if (best > INT_MAX)
389		best = INT_MAX;
390	min = max = best;
391	mindir = maxdir = valdir;
392	if (maxdir > 0)
393		maxdir = 0;
394	else if (maxdir == 0)
395		maxdir = -1;
396	else {
397		maxdir = 1;
398		max--;
399	}
400	save = kmalloc(sizeof(*save), GFP_KERNEL);
401	if (save == NULL)
402		return -ENOMEM;
403	*save = *params;
404	saved_min = min;
405	min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
406	if (min >= 0) {
407		struct snd_pcm_hw_params *params1;
408		if (max < 0)
409			goto _end;
410		if ((unsigned int)min == saved_min && mindir == valdir)
411			goto _end;
412		params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
413		if (params1 == NULL) {
414			kfree(save);
415			return -ENOMEM;
416		}
417		*params1 = *save;
418		max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
419		if (max < 0) {
420			kfree(params1);
421			goto _end;
422		}
423		if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
424			*params = *params1;
425			last = 1;
426		}
427		kfree(params1);
428	} else {
429		*params = *save;
430		max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
431		if (max < 0) {
432			kfree(save);
433			return max;
434		}
435		last = 1;
436	}
437 _end:
438 	kfree(save);
439	if (last)
440		v = snd_pcm_hw_param_last(pcm, params, var, dir);
441	else
442		v = snd_pcm_hw_param_first(pcm, params, var, dir);
443	return v;
444}
445
446static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
447				 snd_pcm_hw_param_t var, unsigned int val,
448				 int dir)
449{
450	int changed;
451	if (hw_is_mask(var)) {
452		struct snd_mask *m = hw_param_mask(params, var);
453		if (val == 0 && dir < 0) {
454			changed = -EINVAL;
455			snd_mask_none(m);
456		} else {
457			if (dir > 0)
458				val++;
459			else if (dir < 0)
460				val--;
461			changed = snd_mask_refine_set(hw_param_mask(params, var), val);
462		}
463	} else if (hw_is_interval(var)) {
464		struct snd_interval *i = hw_param_interval(params, var);
465		if (val == 0 && dir < 0) {
466			changed = -EINVAL;
467			snd_interval_none(i);
468		} else if (dir == 0)
469			changed = snd_interval_refine_set(i, val);
470		else {
471			struct snd_interval t;
472			t.openmin = 1;
473			t.openmax = 1;
474			t.empty = 0;
475			t.integer = 0;
476			if (dir < 0) {
477				t.min = val - 1;
478				t.max = val;
479			} else {
480				t.min = val;
481				t.max = val+1;
482			}
483			changed = snd_interval_refine(i, &t);
484		}
485	} else
486		return -EINVAL;
487	if (changed > 0) {
488		params->cmask |= 1 << var;
489		params->rmask |= 1 << var;
490	}
491	return changed;
492}
493
494/**
495 * snd_pcm_hw_param_set
496 * @pcm: PCM instance
497 * @params: the hw_params instance
498 * @var: parameter to retrieve
499 * @val: value to set
500 * @dir: pointer to the direction (-1,0,1) or NULL
501 *
502 * Inside configuration space defined by PARAMS remove from PAR all
503 * values != VAL. Reduce configuration space accordingly.
504 *  Return VAL or -EINVAL if the configuration space is empty
505 */
506static int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm,
507				struct snd_pcm_hw_params *params,
508				snd_pcm_hw_param_t var, unsigned int val,
509				int dir)
510{
511	int changed = _snd_pcm_hw_param_set(params, var, val, dir);
512	if (changed < 0)
513		return changed;
514	if (params->rmask) {
515		int err = snd_pcm_hw_refine(pcm, params);
516		if (err < 0)
517			return err;
518	}
519	return snd_pcm_hw_param_value(params, var, NULL);
520}
521
522static int _snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params *params,
523					snd_pcm_hw_param_t var)
524{
525	int changed;
526	changed = snd_interval_setinteger(hw_param_interval(params, var));
527	if (changed > 0) {
528		params->cmask |= 1 << var;
529		params->rmask |= 1 << var;
530	}
531	return changed;
532}
533
534/*
535 * plugin
536 */
537
538#ifdef CONFIG_SND_PCM_OSS_PLUGINS
539static int snd_pcm_oss_plugin_clear(struct snd_pcm_substream *substream)
540{
541	struct snd_pcm_runtime *runtime = substream->runtime;
542	struct snd_pcm_plugin *plugin, *next;
543
544	plugin = runtime->oss.plugin_first;
545	while (plugin) {
546		next = plugin->next;
547		snd_pcm_plugin_free(plugin);
548		plugin = next;
549	}
550	runtime->oss.plugin_first = runtime->oss.plugin_last = NULL;
551	return 0;
552}
553
554static int snd_pcm_plugin_insert(struct snd_pcm_plugin *plugin)
555{
556	struct snd_pcm_runtime *runtime = plugin->plug->runtime;
557	plugin->next = runtime->oss.plugin_first;
558	plugin->prev = NULL;
559	if (runtime->oss.plugin_first) {
560		runtime->oss.plugin_first->prev = plugin;
561		runtime->oss.plugin_first = plugin;
562	} else {
563		runtime->oss.plugin_last =
564		runtime->oss.plugin_first = plugin;
565	}
566	return 0;
567}
568
569int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin)
570{
571	struct snd_pcm_runtime *runtime = plugin->plug->runtime;
572	plugin->next = NULL;
573	plugin->prev = runtime->oss.plugin_last;
574	if (runtime->oss.plugin_last) {
575		runtime->oss.plugin_last->next = plugin;
576		runtime->oss.plugin_last = plugin;
577	} else {
578		runtime->oss.plugin_last =
579		runtime->oss.plugin_first = plugin;
580	}
581	return 0;
582}
583#endif /* CONFIG_SND_PCM_OSS_PLUGINS */
584
585static long snd_pcm_oss_bytes(struct snd_pcm_substream *substream, long frames)
586{
587	struct snd_pcm_runtime *runtime = substream->runtime;
588	long buffer_size = snd_pcm_lib_buffer_bytes(substream);
589	long bytes = frames_to_bytes(runtime, frames);
590	if (buffer_size == runtime->oss.buffer_bytes)
591		return bytes;
592#if BITS_PER_LONG >= 64
593	return runtime->oss.buffer_bytes * bytes / buffer_size;
594#else
595	{
596		u64 bsize = (u64)runtime->oss.buffer_bytes * (u64)bytes;
597		return div_u64(bsize, buffer_size);
598	}
599#endif
600}
601
602static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes)
603{
604	struct snd_pcm_runtime *runtime = substream->runtime;
605	long buffer_size = snd_pcm_lib_buffer_bytes(substream);
606	if (buffer_size == runtime->oss.buffer_bytes)
607		return bytes_to_frames(runtime, bytes);
608	return bytes_to_frames(runtime, (buffer_size * bytes) / runtime->oss.buffer_bytes);
609}
610
611static inline
612snd_pcm_uframes_t get_hw_ptr_period(struct snd_pcm_runtime *runtime)
613{
614	return runtime->hw_ptr_interrupt;
615}
616
617/* define extended formats in the recent OSS versions (if any) */
618/* linear formats */
619#define AFMT_S32_LE      0x00001000
620#define AFMT_S32_BE      0x00002000
621#define AFMT_S24_LE      0x00008000
622#define AFMT_S24_BE      0x00010000
623#define AFMT_S24_PACKED  0x00040000
624
625/* other supported formats */
626#define AFMT_FLOAT       0x00004000
627#define AFMT_SPDIF_RAW   0x00020000
628
629/* unsupported formats */
630#define AFMT_AC3         0x00000400
631#define AFMT_VORBIS      0x00000800
632
633static snd_pcm_format_t snd_pcm_oss_format_from(int format)
634{
635	switch (format) {
636	case AFMT_MU_LAW:	return SNDRV_PCM_FORMAT_MU_LAW;
637	case AFMT_A_LAW:	return SNDRV_PCM_FORMAT_A_LAW;
638	case AFMT_IMA_ADPCM:	return SNDRV_PCM_FORMAT_IMA_ADPCM;
639	case AFMT_U8:		return SNDRV_PCM_FORMAT_U8;
640	case AFMT_S16_LE:	return SNDRV_PCM_FORMAT_S16_LE;
641	case AFMT_S16_BE:	return SNDRV_PCM_FORMAT_S16_BE;
642	case AFMT_S8:		return SNDRV_PCM_FORMAT_S8;
643	case AFMT_U16_LE:	return SNDRV_PCM_FORMAT_U16_LE;
644	case AFMT_U16_BE:	return SNDRV_PCM_FORMAT_U16_BE;
645	case AFMT_MPEG:		return SNDRV_PCM_FORMAT_MPEG;
646	case AFMT_S32_LE:	return SNDRV_PCM_FORMAT_S32_LE;
647	case AFMT_S32_BE:	return SNDRV_PCM_FORMAT_S32_BE;
648	case AFMT_S24_LE:	return SNDRV_PCM_FORMAT_S24_LE;
649	case AFMT_S24_BE:	return SNDRV_PCM_FORMAT_S24_BE;
650	case AFMT_S24_PACKED:	return SNDRV_PCM_FORMAT_S24_3LE;
651	case AFMT_FLOAT:	return SNDRV_PCM_FORMAT_FLOAT;
652	case AFMT_SPDIF_RAW:	return SNDRV_PCM_FORMAT_IEC958_SUBFRAME;
653	default:		return SNDRV_PCM_FORMAT_U8;
654	}
655}
656
657static int snd_pcm_oss_format_to(snd_pcm_format_t format)
658{
659	switch (format) {
660	case SNDRV_PCM_FORMAT_MU_LAW:	return AFMT_MU_LAW;
661	case SNDRV_PCM_FORMAT_A_LAW:	return AFMT_A_LAW;
662	case SNDRV_PCM_FORMAT_IMA_ADPCM:	return AFMT_IMA_ADPCM;
663	case SNDRV_PCM_FORMAT_U8:		return AFMT_U8;
664	case SNDRV_PCM_FORMAT_S16_LE:	return AFMT_S16_LE;
665	case SNDRV_PCM_FORMAT_S16_BE:	return AFMT_S16_BE;
666	case SNDRV_PCM_FORMAT_S8:		return AFMT_S8;
667	case SNDRV_PCM_FORMAT_U16_LE:	return AFMT_U16_LE;
668	case SNDRV_PCM_FORMAT_U16_BE:	return AFMT_U16_BE;
669	case SNDRV_PCM_FORMAT_MPEG:		return AFMT_MPEG;
670	case SNDRV_PCM_FORMAT_S32_LE:	return AFMT_S32_LE;
671	case SNDRV_PCM_FORMAT_S32_BE:	return AFMT_S32_BE;
672	case SNDRV_PCM_FORMAT_S24_LE:	return AFMT_S24_LE;
673	case SNDRV_PCM_FORMAT_S24_BE:	return AFMT_S24_BE;
674	case SNDRV_PCM_FORMAT_S24_3LE:	return AFMT_S24_PACKED;
675	case SNDRV_PCM_FORMAT_FLOAT:	return AFMT_FLOAT;
676	case SNDRV_PCM_FORMAT_IEC958_SUBFRAME: return AFMT_SPDIF_RAW;
677	default:			return -EINVAL;
678	}
679}
680
681static int snd_pcm_oss_period_size(struct snd_pcm_substream *substream,
682				   struct snd_pcm_hw_params *oss_params,
683				   struct snd_pcm_hw_params *slave_params)
684{
685	ssize_t s;
686	ssize_t oss_buffer_size;
687	ssize_t oss_period_size, oss_periods;
688	ssize_t min_period_size, max_period_size;
689	struct snd_pcm_runtime *runtime = substream->runtime;
690	size_t oss_frame_size;
691
692	oss_frame_size = snd_pcm_format_physical_width(params_format(oss_params)) *
693			 params_channels(oss_params) / 8;
694
695	oss_buffer_size = snd_pcm_hw_param_value_max(slave_params,
696						     SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
697						     NULL);
698	if (oss_buffer_size <= 0)
699		return -EINVAL;
700	oss_buffer_size = snd_pcm_plug_client_size(substream,
701						   oss_buffer_size * oss_frame_size);
702	if (oss_buffer_size <= 0)
703		return -EINVAL;
704	oss_buffer_size = rounddown_pow_of_two(oss_buffer_size);
705	if (atomic_read(&substream->mmap_count)) {
706		if (oss_buffer_size > runtime->oss.mmap_bytes)
707			oss_buffer_size = runtime->oss.mmap_bytes;
708	}
709
710	if (substream->oss.setup.period_size > 16)
711		oss_period_size = substream->oss.setup.period_size;
712	else if (runtime->oss.fragshift) {
713		oss_period_size = 1 << runtime->oss.fragshift;
714		if (oss_period_size > oss_buffer_size / 2)
715			oss_period_size = oss_buffer_size / 2;
716	} else {
717		int sd;
718		size_t bytes_per_sec = params_rate(oss_params) * snd_pcm_format_physical_width(params_format(oss_params)) * params_channels(oss_params) / 8;
719
720		oss_period_size = oss_buffer_size;
721		do {
722			oss_period_size /= 2;
723		} while (oss_period_size > bytes_per_sec);
724		if (runtime->oss.subdivision == 0) {
725			sd = 4;
726			if (oss_period_size / sd > 4096)
727				sd *= 2;
728			if (oss_period_size / sd < 4096)
729				sd = 1;
730		} else
731			sd = runtime->oss.subdivision;
732		oss_period_size /= sd;
733		if (oss_period_size < 16)
734			oss_period_size = 16;
735	}
736
737	min_period_size = snd_pcm_plug_client_size(substream,
738						   snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
739	if (min_period_size > 0) {
740		min_period_size *= oss_frame_size;
741		min_period_size = roundup_pow_of_two(min_period_size);
742		if (oss_period_size < min_period_size)
743			oss_period_size = min_period_size;
744	}
745
746	max_period_size = snd_pcm_plug_client_size(substream,
747						   snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
748	if (max_period_size > 0) {
749		max_period_size *= oss_frame_size;
750		max_period_size = rounddown_pow_of_two(max_period_size);
751		if (oss_period_size > max_period_size)
752			oss_period_size = max_period_size;
753	}
754
755	oss_periods = oss_buffer_size / oss_period_size;
756
757	if (substream->oss.setup.periods > 1)
758		oss_periods = substream->oss.setup.periods;
759
760	s = snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
761	if (s > 0 && runtime->oss.maxfrags && s > runtime->oss.maxfrags)
762		s = runtime->oss.maxfrags;
763	if (oss_periods > s)
764		oss_periods = s;
765
766	s = snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
767	if (s < 2)
768		s = 2;
769	if (oss_periods < s)
770		oss_periods = s;
771
772	while (oss_period_size * oss_periods > oss_buffer_size)
773		oss_period_size /= 2;
774
775	if (oss_period_size < 16)
776		return -EINVAL;
777	runtime->oss.period_bytes = oss_period_size;
778	runtime->oss.period_frames = 1;
779	runtime->oss.periods = oss_periods;
780	return 0;
781}
782
783static int choose_rate(struct snd_pcm_substream *substream,
784		       struct snd_pcm_hw_params *params, unsigned int best_rate)
785{
786	const struct snd_interval *it;
787	struct snd_pcm_hw_params *save;
788	unsigned int rate, prev;
789
790	save = kmalloc(sizeof(*save), GFP_KERNEL);
791	if (save == NULL)
792		return -ENOMEM;
793	*save = *params;
794	it = hw_param_interval_c(save, SNDRV_PCM_HW_PARAM_RATE);
795
796	/* try multiples of the best rate */
797	rate = best_rate;
798	for (;;) {
799		if (it->max < rate || (it->max == rate && it->openmax))
800			break;
801		if (it->min < rate || (it->min == rate && !it->openmin)) {
802			int ret;
803			ret = snd_pcm_hw_param_set(substream, params,
804						   SNDRV_PCM_HW_PARAM_RATE,
805						   rate, 0);
806			if (ret == (int)rate) {
807				kfree(save);
808				return rate;
809			}
810			*params = *save;
811		}
812		prev = rate;
813		rate += best_rate;
814		if (rate <= prev)
815			break;
816	}
817
818	/* not found, use the nearest rate */
819	kfree(save);
820	return snd_pcm_hw_param_near(substream, params, SNDRV_PCM_HW_PARAM_RATE, best_rate, NULL);
821}
822
823/* parameter locking: returns immediately if tried during streaming */
824static int lock_params(struct snd_pcm_runtime *runtime)
825{
826	if (mutex_lock_interruptible(&runtime->oss.params_lock))
827		return -ERESTARTSYS;
828	if (atomic_read(&runtime->oss.rw_ref)) {
829		mutex_unlock(&runtime->oss.params_lock);
830		return -EBUSY;
831	}
832	return 0;
833}
834
835static void unlock_params(struct snd_pcm_runtime *runtime)
836{
837	mutex_unlock(&runtime->oss.params_lock);
838}
839
840/* call with params_lock held */
841static int snd_pcm_oss_change_params_locked(struct snd_pcm_substream *substream)
842{
843	struct snd_pcm_runtime *runtime = substream->runtime;
844	struct snd_pcm_hw_params *params, *sparams;
845	struct snd_pcm_sw_params *sw_params;
846	ssize_t oss_buffer_size, oss_period_size;
847	size_t oss_frame_size;
848	int err;
849	int direct;
850	snd_pcm_format_t format, sformat;
851	int n;
852	const struct snd_mask *sformat_mask;
853	struct snd_mask mask;
854
855	if (!runtime->oss.params)
856		return 0;
857	sw_params = kzalloc(sizeof(*sw_params), GFP_KERNEL);
858	params = kmalloc(sizeof(*params), GFP_KERNEL);
859	sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
860	if (!sw_params || !params || !sparams) {
861		err = -ENOMEM;
862		goto failure;
863	}
864
865	if (atomic_read(&substream->mmap_count))
866		direct = 1;
867	else
868		direct = substream->oss.setup.direct;
869
870	_snd_pcm_hw_params_any(sparams);
871	_snd_pcm_hw_param_setinteger(sparams, SNDRV_PCM_HW_PARAM_PERIODS);
872	_snd_pcm_hw_param_min(sparams, SNDRV_PCM_HW_PARAM_PERIODS, 2, 0);
873	snd_mask_none(&mask);
874	if (atomic_read(&substream->mmap_count))
875		snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
876	else {
877		snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED);
878		if (!direct)
879			snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
880	}
881	err = snd_pcm_hw_param_mask(substream, sparams, SNDRV_PCM_HW_PARAM_ACCESS, &mask);
882	if (err < 0) {
883		pcm_dbg(substream->pcm, "No usable accesses\n");
884		err = -EINVAL;
885		goto failure;
886	}
887
888	err = choose_rate(substream, sparams, runtime->oss.rate);
889	if (err < 0)
890		goto failure;
891	err = snd_pcm_hw_param_near(substream, sparams,
892				    SNDRV_PCM_HW_PARAM_CHANNELS,
893				    runtime->oss.channels, NULL);
894	if (err < 0)
895		goto failure;
896
897	format = snd_pcm_oss_format_from(runtime->oss.format);
898
899	sformat_mask = hw_param_mask_c(sparams, SNDRV_PCM_HW_PARAM_FORMAT);
900	if (direct)
901		sformat = format;
902	else
903		sformat = snd_pcm_plug_slave_format(format, sformat_mask);
904
905	if ((__force int)sformat < 0 ||
906	    !snd_mask_test_format(sformat_mask, sformat)) {
907		pcm_for_each_format(sformat) {
908			if (snd_mask_test_format(sformat_mask, sformat) &&
909			    snd_pcm_oss_format_to(sformat) >= 0)
910				goto format_found;
911		}
912		pcm_dbg(substream->pcm, "Cannot find a format!!!\n");
913		err = -EINVAL;
914		goto failure;
915	}
916 format_found:
917	err = _snd_pcm_hw_param_set(sparams, SNDRV_PCM_HW_PARAM_FORMAT, (__force int)sformat, 0);
918	if (err < 0)
919		goto failure;
920
921	if (direct) {
922		memcpy(params, sparams, sizeof(*params));
923	} else {
924		_snd_pcm_hw_params_any(params);
925		_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
926				      (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED, 0);
927		_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
928				      (__force int)snd_pcm_oss_format_from(runtime->oss.format), 0);
929		_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
930				      runtime->oss.channels, 0);
931		_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
932				      runtime->oss.rate, 0);
933		pdprintf("client: access = %i, format = %i, channels = %i, rate = %i\n",
934			 params_access(params), params_format(params),
935			 params_channels(params), params_rate(params));
936	}
937	pdprintf("slave: access = %i, format = %i, channels = %i, rate = %i\n",
938		 params_access(sparams), params_format(sparams),
939		 params_channels(sparams), params_rate(sparams));
940
941	oss_frame_size = snd_pcm_format_physical_width(params_format(params)) *
942			 params_channels(params) / 8;
943
944	err = snd_pcm_oss_period_size(substream, params, sparams);
945	if (err < 0)
946		goto failure;
947
948	n = snd_pcm_plug_slave_size(substream, runtime->oss.period_bytes / oss_frame_size);
949	err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, n, NULL);
950	if (err < 0)
951		goto failure;
952
953	err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIODS,
954				     runtime->oss.periods, NULL);
955	if (err < 0)
956		goto failure;
957
958	snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
959
960	err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, sparams);
961	if (err < 0) {
962		pcm_dbg(substream->pcm, "HW_PARAMS failed: %i\n", err);
963		goto failure;
964	}
965
966#ifdef CONFIG_SND_PCM_OSS_PLUGINS
967	snd_pcm_oss_plugin_clear(substream);
968	if (!direct) {
969		/* add necessary plugins */
970		snd_pcm_oss_plugin_clear(substream);
971		err = snd_pcm_plug_format_plugins(substream, params, sparams);
972		if (err < 0) {
973			pcm_dbg(substream->pcm,
974				"snd_pcm_plug_format_plugins failed: %i\n", err);
975			snd_pcm_oss_plugin_clear(substream);
976			goto failure;
977		}
978		if (runtime->oss.plugin_first) {
979			struct snd_pcm_plugin *plugin;
980			err = snd_pcm_plugin_build_io(substream, sparams, &plugin);
981			if (err < 0) {
982				pcm_dbg(substream->pcm,
983					"snd_pcm_plugin_build_io failed: %i\n", err);
984				snd_pcm_oss_plugin_clear(substream);
985				goto failure;
986			}
987			if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
988				err = snd_pcm_plugin_append(plugin);
989			} else {
990				err = snd_pcm_plugin_insert(plugin);
991			}
992			if (err < 0) {
993				snd_pcm_oss_plugin_clear(substream);
994				goto failure;
995			}
996		}
997	}
998#endif
999
1000	if (runtime->oss.trigger) {
1001		sw_params->start_threshold = 1;
1002	} else {
1003		sw_params->start_threshold = runtime->boundary;
1004	}
1005	if (atomic_read(&substream->mmap_count) ||
1006	    substream->stream == SNDRV_PCM_STREAM_CAPTURE)
1007		sw_params->stop_threshold = runtime->boundary;
1008	else
1009		sw_params->stop_threshold = runtime->buffer_size;
1010	sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
1011	sw_params->period_step = 1;
1012	sw_params->avail_min = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
1013		1 : runtime->period_size;
1014	if (atomic_read(&substream->mmap_count) ||
1015	    substream->oss.setup.nosilence) {
1016		sw_params->silence_threshold = 0;
1017		sw_params->silence_size = 0;
1018	} else {
1019		snd_pcm_uframes_t frames;
1020		frames = runtime->period_size + 16;
1021		if (frames > runtime->buffer_size)
1022			frames = runtime->buffer_size;
1023		sw_params->silence_threshold = frames;
1024		sw_params->silence_size = frames;
1025	}
1026
1027	err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_SW_PARAMS, sw_params);
1028	if (err < 0) {
1029		pcm_dbg(substream->pcm, "SW_PARAMS failed: %i\n", err);
1030		goto failure;
1031	}
1032
1033	runtime->oss.periods = params_periods(sparams);
1034	oss_period_size = snd_pcm_plug_client_size(substream, params_period_size(sparams));
1035	if (oss_period_size < 0) {
1036		err = -EINVAL;
1037		goto failure;
1038	}
1039#ifdef CONFIG_SND_PCM_OSS_PLUGINS
1040	if (runtime->oss.plugin_first) {
1041		err = snd_pcm_plug_alloc(substream, oss_period_size);
1042		if (err < 0)
1043			goto failure;
1044	}
1045#endif
1046	oss_period_size *= oss_frame_size;
1047
1048	oss_buffer_size = oss_period_size * runtime->oss.periods;
1049	if (oss_buffer_size < 0) {
1050		err = -EINVAL;
1051		goto failure;
1052	}
1053
1054	runtime->oss.period_bytes = oss_period_size;
1055	runtime->oss.buffer_bytes = oss_buffer_size;
1056
1057	pdprintf("oss: period bytes = %i, buffer bytes = %i\n",
1058		 runtime->oss.period_bytes,
1059		 runtime->oss.buffer_bytes);
1060	pdprintf("slave: period_size = %i, buffer_size = %i\n",
1061		 params_period_size(sparams),
1062		 params_buffer_size(sparams));
1063
1064	runtime->oss.format = snd_pcm_oss_format_to(params_format(params));
1065	runtime->oss.channels = params_channels(params);
1066	runtime->oss.rate = params_rate(params);
1067
1068	kvfree(runtime->oss.buffer);
1069	runtime->oss.buffer = kvzalloc(runtime->oss.period_bytes, GFP_KERNEL);
1070	if (!runtime->oss.buffer) {
1071		err = -ENOMEM;
1072		goto failure;
1073	}
1074
1075	runtime->oss.params = 0;
1076	runtime->oss.prepare = 1;
1077	runtime->oss.buffer_used = 0;
1078	if (runtime->dma_area)
1079		snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes));
1080
1081	runtime->oss.period_frames = snd_pcm_alsa_frames(substream, oss_period_size);
1082
1083	err = 0;
1084failure:
1085	kfree(sw_params);
1086	kfree(params);
1087	kfree(sparams);
1088	return err;
1089}
1090
1091/* this one takes the lock by itself */
1092static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
1093				     bool trylock)
1094{
1095	struct snd_pcm_runtime *runtime = substream->runtime;
1096	int err;
1097
1098	if (trylock) {
1099		if (!(mutex_trylock(&runtime->oss.params_lock)))
1100			return -EAGAIN;
1101	} else if (mutex_lock_interruptible(&runtime->oss.params_lock))
1102		return -ERESTARTSYS;
1103
1104	err = snd_pcm_oss_change_params_locked(substream);
1105	mutex_unlock(&runtime->oss.params_lock);
1106	return err;
1107}
1108
1109static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream)
1110{
1111	int idx, err;
1112	struct snd_pcm_substream *asubstream = NULL, *substream;
1113
1114	for (idx = 0; idx < 2; idx++) {
1115		substream = pcm_oss_file->streams[idx];
1116		if (substream == NULL)
1117			continue;
1118		if (asubstream == NULL)
1119			asubstream = substream;
1120		if (substream->runtime->oss.params) {
1121			err = snd_pcm_oss_change_params(substream, false);
1122			if (err < 0)
1123				return err;
1124		}
1125	}
1126	if (!asubstream)
1127		return -EIO;
1128	if (r_substream)
1129		*r_substream = asubstream;
1130	return 0;
1131}
1132
1133/* call with params_lock held */
1134/* NOTE: this always call PREPARE unconditionally no matter whether
1135 * runtime->oss.prepare is set or not
1136 */
1137static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
1138{
1139	int err;
1140	struct snd_pcm_runtime *runtime = substream->runtime;
1141
1142	err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
1143	if (err < 0) {
1144		pcm_dbg(substream->pcm,
1145			"snd_pcm_oss_prepare: SNDRV_PCM_IOCTL_PREPARE failed\n");
1146		return err;
1147	}
1148	runtime->oss.prepare = 0;
1149	runtime->oss.prev_hw_ptr_period = 0;
1150	runtime->oss.period_ptr = 0;
1151	runtime->oss.buffer_used = 0;
1152
1153	return 0;
1154}
1155
1156static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream)
1157{
1158	struct snd_pcm_runtime *runtime;
1159	int err;
1160
1161	runtime = substream->runtime;
1162	if (runtime->oss.params) {
1163		err = snd_pcm_oss_change_params(substream, false);
1164		if (err < 0)
1165			return err;
1166	}
1167	if (runtime->oss.prepare) {
1168		if (mutex_lock_interruptible(&runtime->oss.params_lock))
1169			return -ERESTARTSYS;
1170		err = snd_pcm_oss_prepare(substream);
1171		mutex_unlock(&runtime->oss.params_lock);
1172		if (err < 0)
1173			return err;
1174	}
1175	return 0;
1176}
1177
1178/* call with params_lock held */
1179static int snd_pcm_oss_make_ready_locked(struct snd_pcm_substream *substream)
1180{
1181	struct snd_pcm_runtime *runtime;
1182	int err;
1183
1184	runtime = substream->runtime;
1185	if (runtime->oss.params) {
1186		err = snd_pcm_oss_change_params_locked(substream);
1187		if (err < 0)
1188			return err;
1189	}
1190	if (runtime->oss.prepare) {
1191		err = snd_pcm_oss_prepare(substream);
1192		if (err < 0)
1193			return err;
1194	}
1195	return 0;
1196}
1197
1198static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay)
1199{
1200	struct snd_pcm_runtime *runtime;
1201	snd_pcm_uframes_t frames;
1202	int err = 0;
1203
1204	while (1) {
1205		err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, delay);
1206		if (err < 0)
1207			break;
1208		runtime = substream->runtime;
1209		if (*delay <= (snd_pcm_sframes_t)runtime->buffer_size)
1210			break;
1211		/* in case of overrun, skip whole periods like OSS/Linux driver does */
1212		/* until avail(delay) <= buffer_size */
1213		frames = (*delay - runtime->buffer_size) + runtime->period_size - 1;
1214		frames /= runtime->period_size;
1215		frames *= runtime->period_size;
1216		err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_FORWARD, &frames);
1217		if (err < 0)
1218			break;
1219	}
1220	return err;
1221}
1222
1223snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1224{
1225	struct snd_pcm_runtime *runtime = substream->runtime;
1226	int ret;
1227	while (1) {
1228		if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1229		    runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1230#ifdef OSS_DEBUG
1231			pcm_dbg(substream->pcm,
1232				"pcm_oss: write: recovering from %s\n",
1233				runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1234				"XRUN" : "SUSPEND");
1235#endif
1236			ret = snd_pcm_oss_prepare(substream);
1237			if (ret < 0)
1238				break;
1239		}
1240		mutex_unlock(&runtime->oss.params_lock);
1241		ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1242					 frames, in_kernel);
1243		mutex_lock(&runtime->oss.params_lock);
1244		if (ret != -EPIPE && ret != -ESTRPIPE)
1245			break;
1246		/* test, if we can't store new data, because the stream */
1247		/* has not been started */
1248		if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1249			return -EAGAIN;
1250	}
1251	return ret;
1252}
1253
1254snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1255{
1256	struct snd_pcm_runtime *runtime = substream->runtime;
1257	snd_pcm_sframes_t delay;
1258	int ret;
1259	while (1) {
1260		if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1261		    runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1262#ifdef OSS_DEBUG
1263			pcm_dbg(substream->pcm,
1264				"pcm_oss: read: recovering from %s\n",
1265				runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1266				"XRUN" : "SUSPEND");
1267#endif
1268			ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1269			if (ret < 0)
1270				break;
1271		} else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1272			ret = snd_pcm_oss_prepare(substream);
1273			if (ret < 0)
1274				break;
1275		}
1276		ret = snd_pcm_oss_capture_position_fixup(substream, &delay);
1277		if (ret < 0)
1278			break;
1279		mutex_unlock(&runtime->oss.params_lock);
1280		ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1281					 frames, in_kernel);
1282		mutex_lock(&runtime->oss.params_lock);
1283		if (ret == -EPIPE) {
1284			if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1285				ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1286				if (ret < 0)
1287					break;
1288			}
1289			continue;
1290		}
1291		if (ret != -ESTRPIPE)
1292			break;
1293	}
1294	return ret;
1295}
1296
1297#ifdef CONFIG_SND_PCM_OSS_PLUGINS
1298snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1299{
1300	struct snd_pcm_runtime *runtime = substream->runtime;
1301	int ret;
1302	while (1) {
1303		if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1304		    runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1305#ifdef OSS_DEBUG
1306			pcm_dbg(substream->pcm,
1307				"pcm_oss: writev: recovering from %s\n",
1308				runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1309				"XRUN" : "SUSPEND");
1310#endif
1311			ret = snd_pcm_oss_prepare(substream);
1312			if (ret < 0)
1313				break;
1314		}
1315		ret = snd_pcm_kernel_writev(substream, bufs, frames);
1316		if (ret != -EPIPE && ret != -ESTRPIPE)
1317			break;
1318
1319		/* test, if we can't store new data, because the stream */
1320		/* has not been started */
1321		if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1322			return -EAGAIN;
1323	}
1324	return ret;
1325}
1326
1327snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1328{
1329	struct snd_pcm_runtime *runtime = substream->runtime;
1330	int ret;
1331	while (1) {
1332		if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1333		    runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1334#ifdef OSS_DEBUG
1335			pcm_dbg(substream->pcm,
1336				"pcm_oss: readv: recovering from %s\n",
1337				runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1338				"XRUN" : "SUSPEND");
1339#endif
1340			ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1341			if (ret < 0)
1342				break;
1343		} else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1344			ret = snd_pcm_oss_prepare(substream);
1345			if (ret < 0)
1346				break;
1347		}
1348		ret = snd_pcm_kernel_readv(substream, bufs, frames);
1349		if (ret != -EPIPE && ret != -ESTRPIPE)
1350			break;
1351	}
1352	return ret;
1353}
1354#endif /* CONFIG_SND_PCM_OSS_PLUGINS */
1355
1356static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel)
1357{
1358	struct snd_pcm_runtime *runtime = substream->runtime;
1359	snd_pcm_sframes_t frames, frames1;
1360#ifdef CONFIG_SND_PCM_OSS_PLUGINS
1361	if (runtime->oss.plugin_first) {
1362		struct snd_pcm_plugin_channel *channels;
1363		size_t oss_frame_bytes = (runtime->oss.plugin_first->src_width * runtime->oss.plugin_first->src_format.channels) / 8;
1364		if (!in_kernel) {
1365			if (copy_from_user(runtime->oss.buffer, (const char __force __user *)buf, bytes))
1366				return -EFAULT;
1367			buf = runtime->oss.buffer;
1368		}
1369		frames = bytes / oss_frame_bytes;
1370		frames1 = snd_pcm_plug_client_channels_buf(substream, (char *)buf, frames, &channels);
1371		if (frames1 < 0)
1372			return frames1;
1373		frames1 = snd_pcm_plug_write_transfer(substream, channels, frames1);
1374		if (frames1 <= 0)
1375			return frames1;
1376		bytes = frames1 * oss_frame_bytes;
1377	} else
1378#endif
1379	{
1380		frames = bytes_to_frames(runtime, bytes);
1381		frames1 = snd_pcm_oss_write3(substream, buf, frames, in_kernel);
1382		if (frames1 <= 0)
1383			return frames1;
1384		bytes = frames_to_bytes(runtime, frames1);
1385	}
1386	return bytes;
1387}
1388
1389static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes)
1390{
1391	size_t xfer = 0;
1392	ssize_t tmp = 0;
1393	struct snd_pcm_runtime *runtime = substream->runtime;
1394
1395	if (atomic_read(&substream->mmap_count))
1396		return -ENXIO;
1397
1398	atomic_inc(&runtime->oss.rw_ref);
1399	while (bytes > 0) {
1400		if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1401			tmp = -ERESTARTSYS;
1402			break;
1403		}
1404		tmp = snd_pcm_oss_make_ready_locked(substream);
1405		if (tmp < 0)
1406			goto err;
1407		if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1408			tmp = bytes;
1409			if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
1410				tmp = runtime->oss.period_bytes - runtime->oss.buffer_used;
1411			if (tmp > 0) {
1412				if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp)) {
1413					tmp = -EFAULT;
1414					goto err;
1415				}
1416			}
1417			runtime->oss.buffer_used += tmp;
1418			buf += tmp;
1419			bytes -= tmp;
1420			xfer += tmp;
1421			if (substream->oss.setup.partialfrag ||
1422			    runtime->oss.buffer_used == runtime->oss.period_bytes) {
1423				tmp = snd_pcm_oss_write2(substream, runtime->oss.buffer + runtime->oss.period_ptr,
1424							 runtime->oss.buffer_used - runtime->oss.period_ptr, 1);
1425				if (tmp <= 0)
1426					goto err;
1427				runtime->oss.bytes += tmp;
1428				runtime->oss.period_ptr += tmp;
1429				runtime->oss.period_ptr %= runtime->oss.period_bytes;
1430				if (runtime->oss.period_ptr == 0 ||
1431				    runtime->oss.period_ptr == runtime->oss.buffer_used)
1432					runtime->oss.buffer_used = 0;
1433				else if ((substream->f_flags & O_NONBLOCK) != 0) {
1434					tmp = -EAGAIN;
1435					goto err;
1436				}
1437			}
1438		} else {
1439			tmp = snd_pcm_oss_write2(substream,
1440						 (const char __force *)buf,
1441						 runtime->oss.period_bytes, 0);
1442			if (tmp <= 0)
1443				goto err;
1444			runtime->oss.bytes += tmp;
1445			buf += tmp;
1446			bytes -= tmp;
1447			xfer += tmp;
1448			if ((substream->f_flags & O_NONBLOCK) != 0 &&
1449			    tmp != runtime->oss.period_bytes)
1450				tmp = -EAGAIN;
1451		}
1452 err:
1453		mutex_unlock(&runtime->oss.params_lock);
1454		if (tmp < 0)
1455			break;
1456		if (signal_pending(current)) {
1457			tmp = -ERESTARTSYS;
1458			break;
1459		}
1460		tmp = 0;
1461	}
1462	atomic_dec(&runtime->oss.rw_ref);
1463	return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1464}
1465
1466static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel)
1467{
1468	struct snd_pcm_runtime *runtime = substream->runtime;
1469	snd_pcm_sframes_t frames, frames1;
1470#ifdef CONFIG_SND_PCM_OSS_PLUGINS
1471	char __user *final_dst = (char __force __user *)buf;
1472	if (runtime->oss.plugin_first) {
1473		struct snd_pcm_plugin_channel *channels;
1474		size_t oss_frame_bytes = (runtime->oss.plugin_last->dst_width * runtime->oss.plugin_last->dst_format.channels) / 8;
1475		if (!in_kernel)
1476			buf = runtime->oss.buffer;
1477		frames = bytes / oss_frame_bytes;
1478		frames1 = snd_pcm_plug_client_channels_buf(substream, buf, frames, &channels);
1479		if (frames1 < 0)
1480			return frames1;
1481		frames1 = snd_pcm_plug_read_transfer(substream, channels, frames1);
1482		if (frames1 <= 0)
1483			return frames1;
1484		bytes = frames1 * oss_frame_bytes;
1485		if (!in_kernel && copy_to_user(final_dst, buf, bytes))
1486			return -EFAULT;
1487	} else
1488#endif
1489	{
1490		frames = bytes_to_frames(runtime, bytes);
1491		frames1 = snd_pcm_oss_read3(substream, buf, frames, in_kernel);
1492		if (frames1 <= 0)
1493			return frames1;
1494		bytes = frames_to_bytes(runtime, frames1);
1495	}
1496	return bytes;
1497}
1498
1499static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes)
1500{
1501	size_t xfer = 0;
1502	ssize_t tmp = 0;
1503	struct snd_pcm_runtime *runtime = substream->runtime;
1504
1505	if (atomic_read(&substream->mmap_count))
1506		return -ENXIO;
1507
1508	atomic_inc(&runtime->oss.rw_ref);
1509	while (bytes > 0) {
1510		if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1511			tmp = -ERESTARTSYS;
1512			break;
1513		}
1514		tmp = snd_pcm_oss_make_ready_locked(substream);
1515		if (tmp < 0)
1516			goto err;
1517		if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1518			if (runtime->oss.buffer_used == 0) {
1519				tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1);
1520				if (tmp <= 0)
1521					goto err;
1522				runtime->oss.bytes += tmp;
1523				runtime->oss.period_ptr = tmp;
1524				runtime->oss.buffer_used = tmp;
1525			}
1526			tmp = bytes;
1527			if ((size_t) tmp > runtime->oss.buffer_used)
1528				tmp = runtime->oss.buffer_used;
1529			if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp)) {
1530				tmp = -EFAULT;
1531				goto err;
1532			}
1533			buf += tmp;
1534			bytes -= tmp;
1535			xfer += tmp;
1536			runtime->oss.buffer_used -= tmp;
1537		} else {
1538			tmp = snd_pcm_oss_read2(substream, (char __force *)buf,
1539						runtime->oss.period_bytes, 0);
1540			if (tmp <= 0)
1541				goto err;
1542			runtime->oss.bytes += tmp;
1543			buf += tmp;
1544			bytes -= tmp;
1545			xfer += tmp;
1546		}
1547 err:
1548		mutex_unlock(&runtime->oss.params_lock);
1549		if (tmp < 0)
1550			break;
1551		if (signal_pending(current)) {
1552			tmp = -ERESTARTSYS;
1553			break;
1554		}
1555		tmp = 0;
1556	}
1557	atomic_dec(&runtime->oss.rw_ref);
1558	return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1559}
1560
1561static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
1562{
1563	struct snd_pcm_substream *substream;
1564	struct snd_pcm_runtime *runtime;
1565	int i;
1566
1567	for (i = 0; i < 2; i++) {
1568		substream = pcm_oss_file->streams[i];
1569		if (!substream)
1570			continue;
1571		runtime = substream->runtime;
1572		snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1573		mutex_lock(&runtime->oss.params_lock);
1574		runtime->oss.prepare = 1;
1575		runtime->oss.buffer_used = 0;
1576		runtime->oss.prev_hw_ptr_period = 0;
1577		runtime->oss.period_ptr = 0;
1578		mutex_unlock(&runtime->oss.params_lock);
1579	}
1580	return 0;
1581}
1582
1583static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file)
1584{
1585	struct snd_pcm_substream *substream;
1586	int err;
1587
1588	substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1589	if (substream != NULL) {
1590		err = snd_pcm_oss_make_ready(substream);
1591		if (err < 0)
1592			return err;
1593		snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL);
1594	}
1595	/* note: all errors from the start action are ignored */
1596	/* OSS apps do not know, how to handle them */
1597	return 0;
1598}
1599
1600static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size)
1601{
1602	struct snd_pcm_runtime *runtime;
1603	ssize_t result = 0;
1604	snd_pcm_state_t state;
1605	long res;
1606	wait_queue_entry_t wait;
1607
1608	runtime = substream->runtime;
1609	init_waitqueue_entry(&wait, current);
1610	add_wait_queue(&runtime->sleep, &wait);
1611#ifdef OSS_DEBUG
1612	pcm_dbg(substream->pcm, "sync1: size = %li\n", size);
1613#endif
1614	while (1) {
1615		result = snd_pcm_oss_write2(substream, runtime->oss.buffer, size, 1);
1616		if (result > 0) {
1617			runtime->oss.buffer_used = 0;
1618			result = 0;
1619			break;
1620		}
1621		if (result != 0 && result != -EAGAIN)
1622			break;
1623		result = 0;
1624		set_current_state(TASK_INTERRUPTIBLE);
1625		snd_pcm_stream_lock_irq(substream);
1626		state = runtime->status->state;
1627		snd_pcm_stream_unlock_irq(substream);
1628		if (state != SNDRV_PCM_STATE_RUNNING) {
1629			set_current_state(TASK_RUNNING);
1630			break;
1631		}
1632		res = schedule_timeout(10 * HZ);
1633		if (signal_pending(current)) {
1634			result = -ERESTARTSYS;
1635			break;
1636		}
1637		if (res == 0) {
1638			pcm_err(substream->pcm,
1639				"OSS sync error - DMA timeout\n");
1640			result = -EIO;
1641			break;
1642		}
1643	}
1644	remove_wait_queue(&runtime->sleep, &wait);
1645	return result;
1646}
1647
1648static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
1649{
1650	int err = 0;
1651	unsigned int saved_f_flags;
1652	struct snd_pcm_substream *substream;
1653	struct snd_pcm_runtime *runtime;
1654	snd_pcm_format_t format;
1655	unsigned long width;
1656	size_t size;
1657
1658	substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1659	if (substream != NULL) {
1660		runtime = substream->runtime;
1661		if (atomic_read(&substream->mmap_count))
1662			goto __direct;
1663		err = snd_pcm_oss_make_ready(substream);
1664		if (err < 0)
1665			return err;
1666		atomic_inc(&runtime->oss.rw_ref);
1667		if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1668			atomic_dec(&runtime->oss.rw_ref);
1669			return -ERESTARTSYS;
1670		}
1671		format = snd_pcm_oss_format_from(runtime->oss.format);
1672		width = snd_pcm_format_physical_width(format);
1673		if (runtime->oss.buffer_used > 0) {
1674#ifdef OSS_DEBUG
1675			pcm_dbg(substream->pcm, "sync: buffer_used\n");
1676#endif
1677			size = (8 * (runtime->oss.period_bytes - runtime->oss.buffer_used) + 7) / width;
1678			snd_pcm_format_set_silence(format,
1679						   runtime->oss.buffer + runtime->oss.buffer_used,
1680						   size);
1681			err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes);
1682			if (err < 0)
1683				goto unlock;
1684		} else if (runtime->oss.period_ptr > 0) {
1685#ifdef OSS_DEBUG
1686			pcm_dbg(substream->pcm, "sync: period_ptr\n");
1687#endif
1688			size = runtime->oss.period_bytes - runtime->oss.period_ptr;
1689			snd_pcm_format_set_silence(format,
1690						   runtime->oss.buffer,
1691						   size * 8 / width);
1692			err = snd_pcm_oss_sync1(substream, size);
1693			if (err < 0)
1694				goto unlock;
1695		}
1696		/*
1697		 * The ALSA's period might be a bit large than OSS one.
1698		 * Fill the remain portion of ALSA period with zeros.
1699		 */
1700		size = runtime->control->appl_ptr % runtime->period_size;
1701		if (size > 0) {
1702			size = runtime->period_size - size;
1703			if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED)
1704				snd_pcm_lib_write(substream, NULL, size);
1705			else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1706				snd_pcm_lib_writev(substream, NULL, size);
1707		}
1708unlock:
1709		mutex_unlock(&runtime->oss.params_lock);
1710		atomic_dec(&runtime->oss.rw_ref);
1711		if (err < 0)
1712			return err;
1713		/*
1714		 * finish sync: drain the buffer
1715		 */
1716	      __direct:
1717		saved_f_flags = substream->f_flags;
1718		substream->f_flags &= ~O_NONBLOCK;
1719		err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1720		substream->f_flags = saved_f_flags;
1721		if (err < 0)
1722			return err;
1723		mutex_lock(&runtime->oss.params_lock);
1724		runtime->oss.prepare = 1;
1725		mutex_unlock(&runtime->oss.params_lock);
1726	}
1727
1728	substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
1729	if (substream != NULL) {
1730		err = snd_pcm_oss_make_ready(substream);
1731		if (err < 0)
1732			return err;
1733		runtime = substream->runtime;
1734		err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1735		if (err < 0)
1736			return err;
1737		mutex_lock(&runtime->oss.params_lock);
1738		runtime->oss.buffer_used = 0;
1739		runtime->oss.prepare = 1;
1740		mutex_unlock(&runtime->oss.params_lock);
1741	}
1742	return 0;
1743}
1744
1745static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)
1746{
1747	int idx;
1748
1749	for (idx = 1; idx >= 0; --idx) {
1750		struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1751		struct snd_pcm_runtime *runtime;
1752		int err;
1753
1754		if (substream == NULL)
1755			continue;
1756		runtime = substream->runtime;
1757		if (rate < 1000)
1758			rate = 1000;
1759		else if (rate > 192000)
1760			rate = 192000;
1761		err = lock_params(runtime);
1762		if (err < 0)
1763			return err;
1764		if (runtime->oss.rate != rate) {
1765			runtime->oss.params = 1;
1766			runtime->oss.rate = rate;
1767		}
1768		unlock_params(runtime);
1769	}
1770	return snd_pcm_oss_get_rate(pcm_oss_file);
1771}
1772
1773static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file)
1774{
1775	struct snd_pcm_substream *substream;
1776	int err;
1777
1778	err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1779	if (err < 0)
1780		return err;
1781	return substream->runtime->oss.rate;
1782}
1783
1784static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels)
1785{
1786	int idx;
1787	if (channels < 1)
1788		channels = 1;
1789	if (channels > 128)
1790		return -EINVAL;
1791	for (idx = 1; idx >= 0; --idx) {
1792		struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1793		struct snd_pcm_runtime *runtime;
1794		int err;
1795
1796		if (substream == NULL)
1797			continue;
1798		runtime = substream->runtime;
1799		err = lock_params(runtime);
1800		if (err < 0)
1801			return err;
1802		if (runtime->oss.channels != channels) {
1803			runtime->oss.params = 1;
1804			runtime->oss.channels = channels;
1805		}
1806		unlock_params(runtime);
1807	}
1808	return snd_pcm_oss_get_channels(pcm_oss_file);
1809}
1810
1811static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file)
1812{
1813	struct snd_pcm_substream *substream;
1814	int err;
1815
1816	err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1817	if (err < 0)
1818		return err;
1819	return substream->runtime->oss.channels;
1820}
1821
1822static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file)
1823{
1824	struct snd_pcm_substream *substream;
1825	int err;
1826
1827	err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1828	if (err < 0)
1829		return err;
1830	return substream->runtime->oss.period_bytes;
1831}
1832
1833static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file)
1834{
1835	struct snd_pcm_substream *substream;
1836	int err;
1837	int direct;
1838	struct snd_pcm_hw_params *params;
1839	unsigned int formats = 0;
1840	const struct snd_mask *format_mask;
1841	int fmt;
1842
1843	err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1844	if (err < 0)
1845		return err;
1846	if (atomic_read(&substream->mmap_count))
1847		direct = 1;
1848	else
1849		direct = substream->oss.setup.direct;
1850	if (!direct)
1851		return AFMT_MU_LAW | AFMT_U8 |
1852		       AFMT_S16_LE | AFMT_S16_BE |
1853		       AFMT_S8 | AFMT_U16_LE |
1854		       AFMT_U16_BE |
1855			AFMT_S32_LE | AFMT_S32_BE |
1856			AFMT_S24_LE | AFMT_S24_BE |
1857			AFMT_S24_PACKED;
1858	params = kmalloc(sizeof(*params), GFP_KERNEL);
1859	if (!params)
1860		return -ENOMEM;
1861	_snd_pcm_hw_params_any(params);
1862	err = snd_pcm_hw_refine(substream, params);
1863	if (err < 0)
1864		goto error;
1865	format_mask = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
1866	for (fmt = 0; fmt < 32; ++fmt) {
1867		if (snd_mask_test(format_mask, fmt)) {
1868			int f = snd_pcm_oss_format_to((__force snd_pcm_format_t)fmt);
1869			if (f >= 0)
1870				formats |= f;
1871		}
1872	}
1873
1874 error:
1875	kfree(params);
1876	return err < 0 ? err : formats;
1877}
1878
1879static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format)
1880{
1881	int formats, idx;
1882	int err;
1883
1884	if (format != AFMT_QUERY) {
1885		formats = snd_pcm_oss_get_formats(pcm_oss_file);
1886		if (formats < 0)
1887			return formats;
1888		if (!(formats & format))
1889			format = AFMT_U8;
1890		for (idx = 1; idx >= 0; --idx) {
1891			struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1892			struct snd_pcm_runtime *runtime;
1893			if (substream == NULL)
1894				continue;
1895			runtime = substream->runtime;
1896			err = lock_params(runtime);
1897			if (err < 0)
1898				return err;
1899			if (runtime->oss.format != format) {
1900				runtime->oss.params = 1;
1901				runtime->oss.format = format;
1902			}
1903			unlock_params(runtime);
1904		}
1905	}
1906	return snd_pcm_oss_get_format(pcm_oss_file);
1907}
1908
1909static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file)
1910{
1911	struct snd_pcm_substream *substream;
1912	int err;
1913
1914	err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1915	if (err < 0)
1916		return err;
1917	return substream->runtime->oss.format;
1918}
1919
1920static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide)
1921{
1922	struct snd_pcm_runtime *runtime;
1923
1924	runtime = substream->runtime;
1925	if (subdivide == 0) {
1926		subdivide = runtime->oss.subdivision;
1927		if (subdivide == 0)
1928			subdivide = 1;
1929		return subdivide;
1930	}
1931	if (runtime->oss.subdivision || runtime->oss.fragshift)
1932		return -EINVAL;
1933	if (subdivide != 1 && subdivide != 2 && subdivide != 4 &&
1934	    subdivide != 8 && subdivide != 16)
1935		return -EINVAL;
1936	runtime->oss.subdivision = subdivide;
1937	runtime->oss.params = 1;
1938	return subdivide;
1939}
1940
1941static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide)
1942{
1943	int err = -EINVAL, idx;
1944
1945	for (idx = 1; idx >= 0; --idx) {
1946		struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1947		struct snd_pcm_runtime *runtime;
1948
1949		if (substream == NULL)
1950			continue;
1951		runtime = substream->runtime;
1952		err = lock_params(runtime);
1953		if (err < 0)
1954			return err;
1955		err = snd_pcm_oss_set_subdivide1(substream, subdivide);
1956		unlock_params(runtime);
1957		if (err < 0)
1958			return err;
1959	}
1960	return err;
1961}
1962
1963static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val)
1964{
1965	struct snd_pcm_runtime *runtime;
1966	int fragshift;
1967
1968	runtime = substream->runtime;
1969	if (runtime->oss.subdivision || runtime->oss.fragshift)
1970		return -EINVAL;
1971	fragshift = val & 0xffff;
1972	if (fragshift >= 25) /* should be large enough */
1973		return -EINVAL;
1974	runtime->oss.fragshift = fragshift;
1975	runtime->oss.maxfrags = (val >> 16) & 0xffff;
1976	if (runtime->oss.fragshift < 4)		/* < 16 */
1977		runtime->oss.fragshift = 4;
1978	if (runtime->oss.maxfrags < 2)
1979		runtime->oss.maxfrags = 2;
1980	runtime->oss.params = 1;
1981	return 0;
1982}
1983
1984static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val)
1985{
1986	int err = -EINVAL, idx;
1987
1988	for (idx = 1; idx >= 0; --idx) {
1989		struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1990		struct snd_pcm_runtime *runtime;
1991
1992		if (substream == NULL)
1993			continue;
1994		runtime = substream->runtime;
1995		err = lock_params(runtime);
1996		if (err < 0)
1997			return err;
1998		err = snd_pcm_oss_set_fragment1(substream, val);
1999		unlock_params(runtime);
2000		if (err < 0)
2001			return err;
2002	}
2003	return err;
2004}
2005
2006static int snd_pcm_oss_nonblock(struct file * file)
2007{
2008	spin_lock(&file->f_lock);
2009	file->f_flags |= O_NONBLOCK;
2010	spin_unlock(&file->f_lock);
2011	return 0;
2012}
2013
2014static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res)
2015{
2016
2017	if (substream == NULL) {
2018		res &= ~DSP_CAP_DUPLEX;
2019		return res;
2020	}
2021#ifdef DSP_CAP_MULTI
2022	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2023		if (substream->pstr->substream_count > 1)
2024			res |= DSP_CAP_MULTI;
2025#endif
2026	/* DSP_CAP_REALTIME is set all times: */
2027	/* all ALSA drivers can return actual pointer in ring buffer */
2028#if defined(DSP_CAP_REALTIME) && 0
2029	{
2030		struct snd_pcm_runtime *runtime = substream->runtime;
2031		if (runtime->info & (SNDRV_PCM_INFO_BLOCK_TRANSFER|SNDRV_PCM_INFO_BATCH))
2032			res &= ~DSP_CAP_REALTIME;
2033	}
2034#endif
2035	return res;
2036}
2037
2038static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)
2039{
2040	int result, idx;
2041
2042	result = DSP_CAP_TRIGGER | DSP_CAP_MMAP	| DSP_CAP_DUPLEX | DSP_CAP_REALTIME;
2043	for (idx = 0; idx < 2; idx++) {
2044		struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
2045		result = snd_pcm_oss_get_caps1(substream, result);
2046	}
2047	result |= 0x0001;	/* revision - same as SB AWE 64 */
2048	return result;
2049}
2050
2051static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
2052				      snd_pcm_uframes_t hw_ptr)
2053{
2054	struct snd_pcm_runtime *runtime = substream->runtime;
2055	snd_pcm_uframes_t appl_ptr;
2056	appl_ptr = hw_ptr + runtime->buffer_size;
2057	appl_ptr %= runtime->boundary;
2058	runtime->control->appl_ptr = appl_ptr;
2059}
2060
2061static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger)
2062{
2063	struct snd_pcm_runtime *runtime;
2064	struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2065	int err, cmd;
2066
2067#ifdef OSS_DEBUG
2068	pr_debug("pcm_oss: trigger = 0x%x\n", trigger);
2069#endif
2070
2071	psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2072	csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2073
2074	if (psubstream) {
2075		err = snd_pcm_oss_make_ready(psubstream);
2076		if (err < 0)
2077			return err;
2078	}
2079	if (csubstream) {
2080		err = snd_pcm_oss_make_ready(csubstream);
2081		if (err < 0)
2082			return err;
2083	}
2084      	if (psubstream) {
2085      		runtime = psubstream->runtime;
2086		cmd = 0;
2087		if (mutex_lock_interruptible(&runtime->oss.params_lock))
2088			return -ERESTARTSYS;
2089		if (trigger & PCM_ENABLE_OUTPUT) {
2090			if (runtime->oss.trigger)
2091				goto _skip1;
2092			if (atomic_read(&psubstream->mmap_count))
2093				snd_pcm_oss_simulate_fill(psubstream,
2094						get_hw_ptr_period(runtime));
2095			runtime->oss.trigger = 1;
2096			runtime->start_threshold = 1;
2097			cmd = SNDRV_PCM_IOCTL_START;
2098		} else {
2099			if (!runtime->oss.trigger)
2100				goto _skip1;
2101			runtime->oss.trigger = 0;
2102			runtime->start_threshold = runtime->boundary;
2103			cmd = SNDRV_PCM_IOCTL_DROP;
2104			runtime->oss.prepare = 1;
2105		}
2106 _skip1:
2107		mutex_unlock(&runtime->oss.params_lock);
2108		if (cmd) {
2109			err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL);
2110			if (err < 0)
2111				return err;
2112		}
2113	}
2114	if (csubstream) {
2115      		runtime = csubstream->runtime;
2116		cmd = 0;
2117		if (mutex_lock_interruptible(&runtime->oss.params_lock))
2118			return -ERESTARTSYS;
2119		if (trigger & PCM_ENABLE_INPUT) {
2120			if (runtime->oss.trigger)
2121				goto _skip2;
2122			runtime->oss.trigger = 1;
2123			runtime->start_threshold = 1;
2124			cmd = SNDRV_PCM_IOCTL_START;
2125		} else {
2126			if (!runtime->oss.trigger)
2127				goto _skip2;
2128			runtime->oss.trigger = 0;
2129			runtime->start_threshold = runtime->boundary;
2130			cmd = SNDRV_PCM_IOCTL_DROP;
2131			runtime->oss.prepare = 1;
2132		}
2133 _skip2:
2134		mutex_unlock(&runtime->oss.params_lock);
2135		if (cmd) {
2136			err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL);
2137			if (err < 0)
2138				return err;
2139		}
2140	}
2141	return 0;
2142}
2143
2144static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file)
2145{
2146	struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2147	int result = 0;
2148
2149	psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2150	csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2151	if (psubstream && psubstream->runtime && psubstream->runtime->oss.trigger)
2152		result |= PCM_ENABLE_OUTPUT;
2153	if (csubstream && csubstream->runtime && csubstream->runtime->oss.trigger)
2154		result |= PCM_ENABLE_INPUT;
2155	return result;
2156}
2157
2158static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file)
2159{
2160	struct snd_pcm_substream *substream;
2161	struct snd_pcm_runtime *runtime;
2162	snd_pcm_sframes_t delay;
2163	int err;
2164
2165	substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2166	if (substream == NULL)
2167		return -EINVAL;
2168	err = snd_pcm_oss_make_ready(substream);
2169	if (err < 0)
2170		return err;
2171	runtime = substream->runtime;
2172	if (runtime->oss.params || runtime->oss.prepare)
2173		return 0;
2174	err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2175	if (err == -EPIPE)
2176		delay = 0;	/* hack for broken OSS applications */
2177	else if (err < 0)
2178		return err;
2179	return snd_pcm_oss_bytes(substream, delay);
2180}
2181
2182static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info)
2183{
2184	struct snd_pcm_substream *substream;
2185	struct snd_pcm_runtime *runtime;
2186	snd_pcm_sframes_t delay;
2187	int fixup;
2188	struct count_info info;
2189	int err;
2190
2191	if (_info == NULL)
2192		return -EFAULT;
2193	substream = pcm_oss_file->streams[stream];
2194	if (substream == NULL)
2195		return -EINVAL;
2196	err = snd_pcm_oss_make_ready(substream);
2197	if (err < 0)
2198		return err;
2199	runtime = substream->runtime;
2200	if (runtime->oss.params || runtime->oss.prepare) {
2201		memset(&info, 0, sizeof(info));
2202		if (copy_to_user(_info, &info, sizeof(info)))
2203			return -EFAULT;
2204		return 0;
2205	}
2206	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2207		err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2208		if (err == -EPIPE || err == -ESTRPIPE || (! err && delay < 0)) {
2209			err = 0;
2210			delay = 0;
2211			fixup = 0;
2212		} else {
2213			fixup = runtime->oss.buffer_used;
2214		}
2215	} else {
2216		err = snd_pcm_oss_capture_position_fixup(substream, &delay);
2217		fixup = -runtime->oss.buffer_used;
2218	}
2219	if (err < 0)
2220		return err;
2221	info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size);
2222	if (atomic_read(&substream->mmap_count)) {
2223		snd_pcm_sframes_t n;
2224		delay = get_hw_ptr_period(runtime);
2225		n = delay - runtime->oss.prev_hw_ptr_period;
2226		if (n < 0)
2227			n += runtime->boundary;
2228		info.blocks = n / runtime->period_size;
2229		runtime->oss.prev_hw_ptr_period = delay;
2230		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2231			snd_pcm_oss_simulate_fill(substream, delay);
2232		info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
2233	} else {
2234		delay = snd_pcm_oss_bytes(substream, delay);
2235		if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2236			if (substream->oss.setup.buggyptr)
2237				info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
2238			else
2239				info.blocks = (delay + fixup) / runtime->oss.period_bytes;
2240			info.bytes = (runtime->oss.bytes - delay) & INT_MAX;
2241		} else {
2242			delay += fixup;
2243			info.blocks = delay / runtime->oss.period_bytes;
2244			info.bytes = (runtime->oss.bytes + delay) & INT_MAX;
2245		}
2246	}
2247	if (copy_to_user(_info, &info, sizeof(info)))
2248		return -EFAULT;
2249	return 0;
2250}
2251
2252static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info)
2253{
2254	struct snd_pcm_substream *substream;
2255	struct snd_pcm_runtime *runtime;
2256	snd_pcm_sframes_t avail;
2257	int fixup;
2258	struct audio_buf_info info;
2259	int err;
2260
2261	if (_info == NULL)
2262		return -EFAULT;
2263	substream = pcm_oss_file->streams[stream];
2264	if (substream == NULL)
2265		return -EINVAL;
2266	runtime = substream->runtime;
2267
2268	if (runtime->oss.params) {
2269		err = snd_pcm_oss_change_params(substream, false);
2270		if (err < 0)
2271			return err;
2272	}
2273
2274	info.fragsize = runtime->oss.period_bytes;
2275	info.fragstotal = runtime->periods;
2276	if (runtime->oss.prepare) {
2277		if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2278			info.bytes = runtime->oss.period_bytes * runtime->oss.periods;
2279			info.fragments = runtime->oss.periods;
2280		} else {
2281			info.bytes = 0;
2282			info.fragments = 0;
2283		}
2284	} else {
2285		if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2286			err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &avail);
2287			if (err == -EPIPE || err == -ESTRPIPE || (! err && avail < 0)) {
2288				avail = runtime->buffer_size;
2289				err = 0;
2290				fixup = 0;
2291			} else {
2292				avail = runtime->buffer_size - avail;
2293				fixup = -runtime->oss.buffer_used;
2294			}
2295		} else {
2296			err = snd_pcm_oss_capture_position_fixup(substream, &avail);
2297			fixup = runtime->oss.buffer_used;
2298		}
2299		if (err < 0)
2300			return err;
2301		info.bytes = snd_pcm_oss_bytes(substream, avail) + fixup;
2302		info.fragments = info.bytes / runtime->oss.period_bytes;
2303	}
2304
2305#ifdef OSS_DEBUG
2306	pcm_dbg(substream->pcm,
2307		"pcm_oss: space: bytes = %i, fragments = %i, fragstotal = %i, fragsize = %i\n",
2308		info.bytes, info.fragments, info.fragstotal, info.fragsize);
2309#endif
2310	if (copy_to_user(_info, &info, sizeof(info)))
2311		return -EFAULT;
2312	return 0;
2313}
2314
2315static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info)
2316{
2317	// it won't be probably implemented
2318	// pr_debug("TODO: snd_pcm_oss_get_mapbuf\n");
2319	return -EINVAL;
2320}
2321
2322static const char *strip_task_path(const char *path)
2323{
2324	const char *ptr, *ptrl = NULL;
2325	for (ptr = path; *ptr; ptr++) {
2326		if (*ptr == '/')
2327			ptrl = ptr + 1;
2328	}
2329	return ptrl;
2330}
2331
2332static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
2333				      const char *task_name,
2334				      struct snd_pcm_oss_setup *rsetup)
2335{
2336	struct snd_pcm_oss_setup *setup;
2337
2338	mutex_lock(&pcm->streams[stream].oss.setup_mutex);
2339	do {
2340		for (setup = pcm->streams[stream].oss.setup_list; setup;
2341		     setup = setup->next) {
2342			if (!strcmp(setup->task_name, task_name))
2343				goto out;
2344		}
2345	} while ((task_name = strip_task_path(task_name)) != NULL);
2346 out:
2347	if (setup)
2348		*rsetup = *setup;
2349	mutex_unlock(&pcm->streams[stream].oss.setup_mutex);
2350}
2351
2352static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream)
2353{
2354	struct snd_pcm_runtime *runtime;
2355	runtime = substream->runtime;
2356	kvfree(runtime->oss.buffer);
2357	runtime->oss.buffer = NULL;
2358#ifdef CONFIG_SND_PCM_OSS_PLUGINS
2359	snd_pcm_oss_plugin_clear(substream);
2360#endif
2361	substream->oss.oss = 0;
2362}
2363
2364static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
2365				       struct snd_pcm_oss_setup *setup,
2366				       int minor)
2367{
2368	struct snd_pcm_runtime *runtime;
2369
2370	substream->oss.oss = 1;
2371	substream->oss.setup = *setup;
2372	if (setup->nonblock)
2373		substream->f_flags |= O_NONBLOCK;
2374	else if (setup->block)
2375		substream->f_flags &= ~O_NONBLOCK;
2376	runtime = substream->runtime;
2377	runtime->oss.params = 1;
2378	runtime->oss.trigger = 1;
2379	runtime->oss.rate = 8000;
2380	mutex_init(&runtime->oss.params_lock);
2381	switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
2382	case SNDRV_MINOR_OSS_PCM_8:
2383		runtime->oss.format = AFMT_U8;
2384		break;
2385	case SNDRV_MINOR_OSS_PCM_16:
2386		runtime->oss.format = AFMT_S16_LE;
2387		break;
2388	default:
2389		runtime->oss.format = AFMT_MU_LAW;
2390	}
2391	runtime->oss.channels = 1;
2392	runtime->oss.fragshift = 0;
2393	runtime->oss.maxfrags = 0;
2394	runtime->oss.subdivision = 0;
2395	substream->pcm_release = snd_pcm_oss_release_substream;
2396	atomic_set(&runtime->oss.rw_ref, 0);
2397}
2398
2399static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file)
2400{
2401	int cidx;
2402	if (!pcm_oss_file)
2403		return 0;
2404	for (cidx = 0; cidx < 2; ++cidx) {
2405		struct snd_pcm_substream *substream = pcm_oss_file->streams[cidx];
2406		if (substream)
2407			snd_pcm_release_substream(substream);
2408	}
2409	kfree(pcm_oss_file);
2410	return 0;
2411}
2412
2413static int snd_pcm_oss_open_file(struct file *file,
2414				 struct snd_pcm *pcm,
2415				 struct snd_pcm_oss_file **rpcm_oss_file,
2416				 int minor,
2417				 struct snd_pcm_oss_setup *setup)
2418{
2419	int idx, err;
2420	struct snd_pcm_oss_file *pcm_oss_file;
2421	struct snd_pcm_substream *substream;
2422	fmode_t f_mode = file->f_mode;
2423
2424	if (rpcm_oss_file)
2425		*rpcm_oss_file = NULL;
2426
2427	pcm_oss_file = kzalloc(sizeof(*pcm_oss_file), GFP_KERNEL);
2428	if (pcm_oss_file == NULL)
2429		return -ENOMEM;
2430
2431	if ((f_mode & (FMODE_WRITE|FMODE_READ)) == (FMODE_WRITE|FMODE_READ) &&
2432	    (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX))
2433		f_mode = FMODE_WRITE;
2434
2435	file->f_flags &= ~O_APPEND;
2436	for (idx = 0; idx < 2; idx++) {
2437		if (setup[idx].disable)
2438			continue;
2439		if (! pcm->streams[idx].substream_count)
2440			continue; /* no matching substream */
2441		if (idx == SNDRV_PCM_STREAM_PLAYBACK) {
2442			if (! (f_mode & FMODE_WRITE))
2443				continue;
2444		} else {
2445			if (! (f_mode & FMODE_READ))
2446				continue;
2447		}
2448		err = snd_pcm_open_substream(pcm, idx, file, &substream);
2449		if (err < 0) {
2450			snd_pcm_oss_release_file(pcm_oss_file);
2451			return err;
2452		}
2453
2454		pcm_oss_file->streams[idx] = substream;
2455		snd_pcm_oss_init_substream(substream, &setup[idx], minor);
2456	}
2457
2458	if (!pcm_oss_file->streams[0] && !pcm_oss_file->streams[1]) {
2459		snd_pcm_oss_release_file(pcm_oss_file);
2460		return -EINVAL;
2461	}
2462
2463	file->private_data = pcm_oss_file;
2464	if (rpcm_oss_file)
2465		*rpcm_oss_file = pcm_oss_file;
2466	return 0;
2467}
2468
2469
2470static int snd_task_name(struct task_struct *task, char *name, size_t size)
2471{
2472	unsigned int idx;
2473
2474	if (snd_BUG_ON(!task || !name || size < 2))
2475		return -EINVAL;
2476	for (idx = 0; idx < sizeof(task->comm) && idx + 1 < size; idx++)
2477		name[idx] = task->comm[idx];
2478	name[idx] = '\0';
2479	return 0;
2480}
2481
2482static int snd_pcm_oss_open(struct inode *inode, struct file *file)
2483{
2484	int err;
2485	char task_name[32];
2486	struct snd_pcm *pcm;
2487	struct snd_pcm_oss_file *pcm_oss_file;
2488	struct snd_pcm_oss_setup setup[2];
2489	int nonblock;
2490	wait_queue_entry_t wait;
2491
2492	err = nonseekable_open(inode, file);
2493	if (err < 0)
2494		return err;
2495
2496	pcm = snd_lookup_oss_minor_data(iminor(inode),
2497					SNDRV_OSS_DEVICE_TYPE_PCM);
2498	if (pcm == NULL) {
2499		err = -ENODEV;
2500		goto __error1;
2501	}
2502	err = snd_card_file_add(pcm->card, file);
2503	if (err < 0)
2504		goto __error1;
2505	if (!try_module_get(pcm->card->module)) {
2506		err = -EFAULT;
2507		goto __error2;
2508	}
2509	if (snd_task_name(current, task_name, sizeof(task_name)) < 0) {
2510		err = -EFAULT;
2511		goto __error;
2512	}
2513	memset(setup, 0, sizeof(setup));
2514	if (file->f_mode & FMODE_WRITE)
2515		snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_PLAYBACK,
2516					   task_name, &setup[0]);
2517	if (file->f_mode & FMODE_READ)
2518		snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_CAPTURE,
2519					   task_name, &setup[1]);
2520
2521	nonblock = !!(file->f_flags & O_NONBLOCK);
2522	if (!nonblock)
2523		nonblock = nonblock_open;
2524
2525	init_waitqueue_entry(&wait, current);
2526	add_wait_queue(&pcm->open_wait, &wait);
2527	mutex_lock(&pcm->open_mutex);
2528	while (1) {
2529		err = snd_pcm_oss_open_file(file, pcm, &pcm_oss_file,
2530					    iminor(inode), setup);
2531		if (err >= 0)
2532			break;
2533		if (err == -EAGAIN) {
2534			if (nonblock) {
2535				err = -EBUSY;
2536				break;
2537			}
2538		} else
2539			break;
2540		set_current_state(TASK_INTERRUPTIBLE);
2541		mutex_unlock(&pcm->open_mutex);
2542		schedule();
2543		mutex_lock(&pcm->open_mutex);
2544		if (pcm->card->shutdown) {
2545			err = -ENODEV;
2546			break;
2547		}
2548		if (signal_pending(current)) {
2549			err = -ERESTARTSYS;
2550			break;
2551		}
2552	}
2553	remove_wait_queue(&pcm->open_wait, &wait);
2554	mutex_unlock(&pcm->open_mutex);
2555	if (err < 0)
2556		goto __error;
2557	snd_card_unref(pcm->card);
2558	return err;
2559
2560      __error:
2561     	module_put(pcm->card->module);
2562      __error2:
2563      	snd_card_file_remove(pcm->card, file);
2564      __error1:
2565	if (pcm)
2566		snd_card_unref(pcm->card);
2567	return err;
2568}
2569
2570static int snd_pcm_oss_release(struct inode *inode, struct file *file)
2571{
2572	struct snd_pcm *pcm;
2573	struct snd_pcm_substream *substream;
2574	struct snd_pcm_oss_file *pcm_oss_file;
2575
2576	pcm_oss_file = file->private_data;
2577	substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2578	if (substream == NULL)
2579		substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2580	if (snd_BUG_ON(!substream))
2581		return -ENXIO;
2582	pcm = substream->pcm;
2583	if (!pcm->card->shutdown)
2584		snd_pcm_oss_sync(pcm_oss_file);
2585	mutex_lock(&pcm->open_mutex);
2586	snd_pcm_oss_release_file(pcm_oss_file);
2587	mutex_unlock(&pcm->open_mutex);
2588	wake_up(&pcm->open_wait);
2589	module_put(pcm->card->module);
2590	snd_card_file_remove(pcm->card, file);
2591	return 0;
2592}
2593
2594static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2595{
2596	struct snd_pcm_oss_file *pcm_oss_file;
2597	int __user *p = (int __user *)arg;
2598	int res;
2599
2600	pcm_oss_file = file->private_data;
2601	if (cmd == OSS_GETVERSION)
2602		return put_user(SNDRV_OSS_VERSION, p);
2603	if (cmd == OSS_ALSAEMULVER)
2604		return put_user(1, p);
2605#if IS_REACHABLE(CONFIG_SND_MIXER_OSS)
2606	if (((cmd >> 8) & 0xff) == 'M')	{	/* mixer ioctl - for OSS compatibility */
2607		struct snd_pcm_substream *substream;
2608		int idx;
2609		for (idx = 0; idx < 2; ++idx) {
2610			substream = pcm_oss_file->streams[idx];
2611			if (substream != NULL)
2612				break;
2613		}
2614		if (snd_BUG_ON(idx >= 2))
2615			return -ENXIO;
2616		return snd_mixer_oss_ioctl_card(substream->pcm->card, cmd, arg);
2617	}
2618#endif
2619	if (((cmd >> 8) & 0xff) != 'P')
2620		return -EINVAL;
2621#ifdef OSS_DEBUG
2622	pr_debug("pcm_oss: ioctl = 0x%x\n", cmd);
2623#endif
2624	switch (cmd) {
2625	case SNDCTL_DSP_RESET:
2626		return snd_pcm_oss_reset(pcm_oss_file);
2627	case SNDCTL_DSP_SYNC:
2628		return snd_pcm_oss_sync(pcm_oss_file);
2629	case SNDCTL_DSP_SPEED:
2630		if (get_user(res, p))
2631			return -EFAULT;
2632		res = snd_pcm_oss_set_rate(pcm_oss_file, res);
2633		if (res < 0)
2634			return res;
2635		return put_user(res, p);
2636	case SOUND_PCM_READ_RATE:
2637		res = snd_pcm_oss_get_rate(pcm_oss_file);
2638		if (res < 0)
2639			return res;
2640		return put_user(res, p);
2641	case SNDCTL_DSP_STEREO:
2642		if (get_user(res, p))
2643			return -EFAULT;
2644		res = res > 0 ? 2 : 1;
2645		res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2646		if (res < 0)
2647			return res;
2648		return put_user(--res, p);
2649	case SNDCTL_DSP_GETBLKSIZE:
2650		res = snd_pcm_oss_get_block_size(pcm_oss_file);
2651		if (res < 0)
2652			return res;
2653		return put_user(res, p);
2654	case SNDCTL_DSP_SETFMT:
2655		if (get_user(res, p))
2656			return -EFAULT;
2657		res = snd_pcm_oss_set_format(pcm_oss_file, res);
2658		if (res < 0)
2659			return res;
2660		return put_user(res, p);
2661	case SOUND_PCM_READ_BITS:
2662		res = snd_pcm_oss_get_format(pcm_oss_file);
2663		if (res < 0)
2664			return res;
2665		return put_user(res, p);
2666	case SNDCTL_DSP_CHANNELS:
2667		if (get_user(res, p))
2668			return -EFAULT;
2669		res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2670		if (res < 0)
2671			return res;
2672		return put_user(res, p);
2673	case SOUND_PCM_READ_CHANNELS:
2674		res = snd_pcm_oss_get_channels(pcm_oss_file);
2675		if (res < 0)
2676			return res;
2677		return put_user(res, p);
2678	case SOUND_PCM_WRITE_FILTER:
2679	case SOUND_PCM_READ_FILTER:
2680		return -EIO;
2681	case SNDCTL_DSP_POST:
2682		return snd_pcm_oss_post(pcm_oss_file);
2683	case SNDCTL_DSP_SUBDIVIDE:
2684		if (get_user(res, p))
2685			return -EFAULT;
2686		res = snd_pcm_oss_set_subdivide(pcm_oss_file, res);
2687		if (res < 0)
2688			return res;
2689		return put_user(res, p);
2690	case SNDCTL_DSP_SETFRAGMENT:
2691		if (get_user(res, p))
2692			return -EFAULT;
2693		return snd_pcm_oss_set_fragment(pcm_oss_file, res);
2694	case SNDCTL_DSP_GETFMTS:
2695		res = snd_pcm_oss_get_formats(pcm_oss_file);
2696		if (res < 0)
2697			return res;
2698		return put_user(res, p);
2699	case SNDCTL_DSP_GETOSPACE:
2700	case SNDCTL_DSP_GETISPACE:
2701		return snd_pcm_oss_get_space(pcm_oss_file,
2702			cmd == SNDCTL_DSP_GETISPACE ?
2703				SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2704			(struct audio_buf_info __user *) arg);
2705	case SNDCTL_DSP_NONBLOCK:
2706		return snd_pcm_oss_nonblock(file);
2707	case SNDCTL_DSP_GETCAPS:
2708		res = snd_pcm_oss_get_caps(pcm_oss_file);
2709		if (res < 0)
2710			return res;
2711		return put_user(res, p);
2712	case SNDCTL_DSP_GETTRIGGER:
2713		res = snd_pcm_oss_get_trigger(pcm_oss_file);
2714		if (res < 0)
2715			return res;
2716		return put_user(res, p);
2717	case SNDCTL_DSP_SETTRIGGER:
2718		if (get_user(res, p))
2719			return -EFAULT;
2720		return snd_pcm_oss_set_trigger(pcm_oss_file, res);
2721	case SNDCTL_DSP_GETIPTR:
2722	case SNDCTL_DSP_GETOPTR:
2723		return snd_pcm_oss_get_ptr(pcm_oss_file,
2724			cmd == SNDCTL_DSP_GETIPTR ?
2725				SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2726			(struct count_info __user *) arg);
2727	case SNDCTL_DSP_MAPINBUF:
2728	case SNDCTL_DSP_MAPOUTBUF:
2729		return snd_pcm_oss_get_mapbuf(pcm_oss_file,
2730			cmd == SNDCTL_DSP_MAPINBUF ?
2731				SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2732			(struct buffmem_desc __user *) arg);
2733	case SNDCTL_DSP_SETSYNCRO:
2734		/* stop DMA now.. */
2735		return 0;
2736	case SNDCTL_DSP_SETDUPLEX:
2737		if (snd_pcm_oss_get_caps(pcm_oss_file) & DSP_CAP_DUPLEX)
2738			return 0;
2739		return -EIO;
2740	case SNDCTL_DSP_GETODELAY:
2741		res = snd_pcm_oss_get_odelay(pcm_oss_file);
2742		if (res < 0) {
2743			/* it's for sure, some broken apps don't check for error codes */
2744			put_user(0, p);
2745			return res;
2746		}
2747		return put_user(res, p);
2748	case SNDCTL_DSP_PROFILE:
2749		return 0;	/* silently ignore */
2750	default:
2751		pr_debug("pcm_oss: unknown command = 0x%x\n", cmd);
2752	}
2753	return -EINVAL;
2754}
2755
2756#ifdef CONFIG_COMPAT
2757/* all compatible */
2758static long snd_pcm_oss_ioctl_compat(struct file *file, unsigned int cmd,
2759				     unsigned long arg)
2760{
2761	/*
2762	 * Everything is compatbile except SNDCTL_DSP_MAPINBUF/SNDCTL_DSP_MAPOUTBUF,
2763	 * which are not implemented for the native case either
2764	 */
2765	return snd_pcm_oss_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2766}
2767#else
2768#define snd_pcm_oss_ioctl_compat	NULL
2769#endif
2770
2771static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
2772{
2773	struct snd_pcm_oss_file *pcm_oss_file;
2774	struct snd_pcm_substream *substream;
2775
2776	pcm_oss_file = file->private_data;
2777	substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2778	if (substream == NULL)
2779		return -ENXIO;
2780	substream->f_flags = file->f_flags & O_NONBLOCK;
2781#ifndef OSS_DEBUG
2782	return snd_pcm_oss_read1(substream, buf, count);
2783#else
2784	{
2785		ssize_t res = snd_pcm_oss_read1(substream, buf, count);
2786		pcm_dbg(substream->pcm,
2787			"pcm_oss: read %li bytes (returned %li bytes)\n",
2788			(long)count, (long)res);
2789		return res;
2790	}
2791#endif
2792}
2793
2794static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
2795{
2796	struct snd_pcm_oss_file *pcm_oss_file;
2797	struct snd_pcm_substream *substream;
2798	long result;
2799
2800	pcm_oss_file = file->private_data;
2801	substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2802	if (substream == NULL)
2803		return -ENXIO;
2804	substream->f_flags = file->f_flags & O_NONBLOCK;
2805	result = snd_pcm_oss_write1(substream, buf, count);
2806#ifdef OSS_DEBUG
2807	pcm_dbg(substream->pcm, "pcm_oss: write %li bytes (wrote %li bytes)\n",
2808	       (long)count, (long)result);
2809#endif
2810	return result;
2811}
2812
2813static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)
2814{
2815	struct snd_pcm_runtime *runtime = substream->runtime;
2816	if (atomic_read(&substream->mmap_count))
2817		return runtime->oss.prev_hw_ptr_period !=
2818						get_hw_ptr_period(runtime);
2819	else
2820		return snd_pcm_playback_avail(runtime) >=
2821						runtime->oss.period_frames;
2822}
2823
2824static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)
2825{
2826	struct snd_pcm_runtime *runtime = substream->runtime;
2827	if (atomic_read(&substream->mmap_count))
2828		return runtime->oss.prev_hw_ptr_period !=
2829						get_hw_ptr_period(runtime);
2830	else
2831		return snd_pcm_capture_avail(runtime) >=
2832						runtime->oss.period_frames;
2833}
2834
2835static __poll_t snd_pcm_oss_poll(struct file *file, poll_table * wait)
2836{
2837	struct snd_pcm_oss_file *pcm_oss_file;
2838	__poll_t mask;
2839	struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2840
2841	pcm_oss_file = file->private_data;
2842
2843	psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2844	csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2845
2846	mask = 0;
2847	if (psubstream != NULL) {
2848		struct snd_pcm_runtime *runtime = psubstream->runtime;
2849		poll_wait(file, &runtime->sleep, wait);
2850		snd_pcm_stream_lock_irq(psubstream);
2851		if (runtime->status->state != SNDRV_PCM_STATE_DRAINING &&
2852		    (runtime->status->state != SNDRV_PCM_STATE_RUNNING ||
2853		     snd_pcm_oss_playback_ready(psubstream)))
2854			mask |= EPOLLOUT | EPOLLWRNORM;
2855		snd_pcm_stream_unlock_irq(psubstream);
2856	}
2857	if (csubstream != NULL) {
2858		struct snd_pcm_runtime *runtime = csubstream->runtime;
2859		snd_pcm_state_t ostate;
2860		poll_wait(file, &runtime->sleep, wait);
2861		snd_pcm_stream_lock_irq(csubstream);
2862		ostate = runtime->status->state;
2863		if (ostate != SNDRV_PCM_STATE_RUNNING ||
2864		    snd_pcm_oss_capture_ready(csubstream))
2865			mask |= EPOLLIN | EPOLLRDNORM;
2866		snd_pcm_stream_unlock_irq(csubstream);
2867		if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) {
2868			struct snd_pcm_oss_file ofile;
2869			memset(&ofile, 0, sizeof(ofile));
2870			ofile.streams[SNDRV_PCM_STREAM_CAPTURE] = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2871			runtime->oss.trigger = 0;
2872			snd_pcm_oss_set_trigger(&ofile, PCM_ENABLE_INPUT);
2873		}
2874	}
2875
2876	return mask;
2877}
2878
2879static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area)
2880{
2881	struct snd_pcm_oss_file *pcm_oss_file;
2882	struct snd_pcm_substream *substream = NULL;
2883	struct snd_pcm_runtime *runtime;
2884	int err;
2885
2886#ifdef OSS_DEBUG
2887	pr_debug("pcm_oss: mmap begin\n");
2888#endif
2889	pcm_oss_file = file->private_data;
2890	switch ((area->vm_flags & (VM_READ | VM_WRITE))) {
2891	case VM_READ | VM_WRITE:
2892		substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2893		if (substream)
2894			break;
2895		fallthrough;
2896	case VM_READ:
2897		substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2898		break;
2899	case VM_WRITE:
2900		substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2901		break;
2902	default:
2903		return -EINVAL;
2904	}
2905	/* set VM_READ access as well to fix memset() routines that do
2906	   reads before writes (to improve performance) */
2907	area->vm_flags |= VM_READ;
2908	if (substream == NULL)
2909		return -ENXIO;
2910	runtime = substream->runtime;
2911	if (!(runtime->info & SNDRV_PCM_INFO_MMAP_VALID))
2912		return -EIO;
2913	if (runtime->info & SNDRV_PCM_INFO_INTERLEAVED)
2914		runtime->access = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2915	else
2916		return -EIO;
2917
2918	if (runtime->oss.params) {
2919		/* use mutex_trylock() for params_lock for avoiding a deadlock
2920		 * between mmap_lock and params_lock taken by
2921		 * copy_from/to_user() in snd_pcm_oss_write/read()
2922		 */
2923		err = snd_pcm_oss_change_params(substream, true);
2924		if (err < 0)
2925			return err;
2926	}
2927#ifdef CONFIG_SND_PCM_OSS_PLUGINS
2928	if (runtime->oss.plugin_first != NULL)
2929		return -EIO;
2930#endif
2931
2932	if (area->vm_pgoff != 0)
2933		return -EINVAL;
2934
2935	err = snd_pcm_mmap_data(substream, file, area);
2936	if (err < 0)
2937		return err;
2938	runtime->oss.mmap_bytes = area->vm_end - area->vm_start;
2939	runtime->silence_threshold = 0;
2940	runtime->silence_size = 0;
2941#ifdef OSS_DEBUG
2942	pr_debug("pcm_oss: mmap ok, bytes = 0x%x\n",
2943	       runtime->oss.mmap_bytes);
2944#endif
2945	/* In mmap mode we never stop */
2946	runtime->stop_threshold = runtime->boundary;
2947
2948	return 0;
2949}
2950
2951#ifdef CONFIG_SND_VERBOSE_PROCFS
2952/*
2953 *  /proc interface
2954 */
2955
2956static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
2957				  struct snd_info_buffer *buffer)
2958{
2959	struct snd_pcm_str *pstr = entry->private_data;
2960	struct snd_pcm_oss_setup *setup = pstr->oss.setup_list;
2961	mutex_lock(&pstr->oss.setup_mutex);
2962	while (setup) {
2963		snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s\n",
2964			    setup->task_name,
2965			    setup->periods,
2966			    setup->period_size,
2967			    setup->disable ? " disable" : "",
2968			    setup->direct ? " direct" : "",
2969			    setup->block ? " block" : "",
2970			    setup->nonblock ? " non-block" : "",
2971			    setup->partialfrag ? " partial-frag" : "",
2972			    setup->nosilence ? " no-silence" : "");
2973		setup = setup->next;
2974	}
2975	mutex_unlock(&pstr->oss.setup_mutex);
2976}
2977
2978static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)
2979{
2980	struct snd_pcm_oss_setup *setup, *setupn;
2981
2982	for (setup = pstr->oss.setup_list, pstr->oss.setup_list = NULL;
2983	     setup; setup = setupn) {
2984		setupn = setup->next;
2985		kfree(setup->task_name);
2986		kfree(setup);
2987	}
2988	pstr->oss.setup_list = NULL;
2989}
2990
2991static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
2992				   struct snd_info_buffer *buffer)
2993{
2994	struct snd_pcm_str *pstr = entry->private_data;
2995	char line[128], str[32], task_name[32];
2996	const char *ptr;
2997	int idx1;
2998	struct snd_pcm_oss_setup *setup, *setup1, template;
2999
3000	while (!snd_info_get_line(buffer, line, sizeof(line))) {
3001		mutex_lock(&pstr->oss.setup_mutex);
3002		memset(&template, 0, sizeof(template));
3003		ptr = snd_info_get_str(task_name, line, sizeof(task_name));
3004		if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) {
3005			snd_pcm_oss_proc_free_setup_list(pstr);
3006			mutex_unlock(&pstr->oss.setup_mutex);
3007			continue;
3008		}
3009		for (setup = pstr->oss.setup_list; setup; setup = setup->next) {
3010			if (!strcmp(setup->task_name, task_name)) {
3011				template = *setup;
3012				break;
3013			}
3014		}
3015		ptr = snd_info_get_str(str, ptr, sizeof(str));
3016		template.periods = simple_strtoul(str, NULL, 10);
3017		ptr = snd_info_get_str(str, ptr, sizeof(str));
3018		template.period_size = simple_strtoul(str, NULL, 10);
3019		for (idx1 = 31; idx1 >= 0; idx1--)
3020			if (template.period_size & (1 << idx1))
3021				break;
3022		for (idx1--; idx1 >= 0; idx1--)
3023			template.period_size &= ~(1 << idx1);
3024		do {
3025			ptr = snd_info_get_str(str, ptr, sizeof(str));
3026			if (!strcmp(str, "disable")) {
3027				template.disable = 1;
3028			} else if (!strcmp(str, "direct")) {
3029				template.direct = 1;
3030			} else if (!strcmp(str, "block")) {
3031				template.block = 1;
3032			} else if (!strcmp(str, "non-block")) {
3033				template.nonblock = 1;
3034			} else if (!strcmp(str, "partial-frag")) {
3035				template.partialfrag = 1;
3036			} else if (!strcmp(str, "no-silence")) {
3037				template.nosilence = 1;
3038			} else if (!strcmp(str, "buggy-ptr")) {
3039				template.buggyptr = 1;
3040			}
3041		} while (*str);
3042		if (setup == NULL) {
3043			setup = kmalloc(sizeof(*setup), GFP_KERNEL);
3044			if (! setup) {
3045				buffer->error = -ENOMEM;
3046				mutex_unlock(&pstr->oss.setup_mutex);
3047				return;
3048			}
3049			if (pstr->oss.setup_list == NULL)
3050				pstr->oss.setup_list = setup;
3051			else {
3052				for (setup1 = pstr->oss.setup_list;
3053				     setup1->next; setup1 = setup1->next);
3054				setup1->next = setup;
3055			}
3056			template.task_name = kstrdup(task_name, GFP_KERNEL);
3057			if (! template.task_name) {
3058				kfree(setup);
3059				buffer->error = -ENOMEM;
3060				mutex_unlock(&pstr->oss.setup_mutex);
3061				return;
3062			}
3063		}
3064		*setup = template;
3065		mutex_unlock(&pstr->oss.setup_mutex);
3066	}
3067}
3068
3069static void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3070{
3071	int stream;
3072	for (stream = 0; stream < 2; ++stream) {
3073		struct snd_info_entry *entry;
3074		struct snd_pcm_str *pstr = &pcm->streams[stream];
3075		if (pstr->substream_count == 0)
3076			continue;
3077		entry = snd_info_create_card_entry(pcm->card, "oss", pstr->proc_root);
3078		if (entry) {
3079			entry->content = SNDRV_INFO_CONTENT_TEXT;
3080			entry->mode = S_IFREG | 0644;
3081			entry->c.text.read = snd_pcm_oss_proc_read;
3082			entry->c.text.write = snd_pcm_oss_proc_write;
3083			entry->private_data = pstr;
3084			if (snd_info_register(entry) < 0) {
3085				snd_info_free_entry(entry);
3086				entry = NULL;
3087			}
3088		}
3089		pstr->oss.proc_entry = entry;
3090	}
3091}
3092
3093static void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3094{
3095	int stream;
3096	for (stream = 0; stream < 2; ++stream) {
3097		struct snd_pcm_str *pstr = &pcm->streams[stream];
3098		snd_info_free_entry(pstr->oss.proc_entry);
3099		pstr->oss.proc_entry = NULL;
3100		snd_pcm_oss_proc_free_setup_list(pstr);
3101	}
3102}
3103#else /* !CONFIG_SND_VERBOSE_PROCFS */
3104static inline void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3105{
3106}
3107static inline void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3108{
3109}
3110#endif /* CONFIG_SND_VERBOSE_PROCFS */
3111
3112/*
3113 *  ENTRY functions
3114 */
3115
3116static const struct file_operations snd_pcm_oss_f_reg =
3117{
3118	.owner =	THIS_MODULE,
3119	.read =		snd_pcm_oss_read,
3120	.write =	snd_pcm_oss_write,
3121	.open =		snd_pcm_oss_open,
3122	.release =	snd_pcm_oss_release,
3123	.llseek =	no_llseek,
3124	.poll =		snd_pcm_oss_poll,
3125	.unlocked_ioctl =	snd_pcm_oss_ioctl,
3126	.compat_ioctl =	snd_pcm_oss_ioctl_compat,
3127	.mmap =		snd_pcm_oss_mmap,
3128};
3129
3130static void register_oss_dsp(struct snd_pcm *pcm, int index)
3131{
3132	if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3133				    pcm->card, index, &snd_pcm_oss_f_reg,
3134				    pcm) < 0) {
3135		pcm_err(pcm, "unable to register OSS PCM device %i:%i\n",
3136			   pcm->card->number, pcm->device);
3137	}
3138}
3139
3140static int snd_pcm_oss_register_minor(struct snd_pcm *pcm)
3141{
3142	pcm->oss.reg = 0;
3143	if (dsp_map[pcm->card->number] == (int)pcm->device) {
3144		char name[128];
3145		int duplex;
3146		register_oss_dsp(pcm, 0);
3147		duplex = (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count > 0 &&
3148			      pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count &&
3149			      !(pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX));
3150		sprintf(name, "%s%s", pcm->name, duplex ? " (DUPLEX)" : "");
3151#ifdef SNDRV_OSS_INFO_DEV_AUDIO
3152		snd_oss_info_register(SNDRV_OSS_INFO_DEV_AUDIO,
3153				      pcm->card->number,
3154				      name);
3155#endif
3156		pcm->oss.reg++;
3157		pcm->oss.reg_mask |= 1;
3158	}
3159	if (adsp_map[pcm->card->number] == (int)pcm->device) {
3160		register_oss_dsp(pcm, 1);
3161		pcm->oss.reg++;
3162		pcm->oss.reg_mask |= 2;
3163	}
3164
3165	if (pcm->oss.reg)
3166		snd_pcm_oss_proc_init(pcm);
3167
3168	return 0;
3169}
3170
3171static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm)
3172{
3173	if (pcm->oss.reg) {
3174		if (pcm->oss.reg_mask & 1) {
3175			pcm->oss.reg_mask &= ~1;
3176			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3177						  pcm->card, 0);
3178		}
3179		if (pcm->oss.reg_mask & 2) {
3180			pcm->oss.reg_mask &= ~2;
3181			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3182						  pcm->card, 1);
3183		}
3184		if (dsp_map[pcm->card->number] == (int)pcm->device) {
3185#ifdef SNDRV_OSS_INFO_DEV_AUDIO
3186			snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number);
3187#endif
3188		}
3189		pcm->oss.reg = 0;
3190	}
3191	return 0;
3192}
3193
3194static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm)
3195{
3196	snd_pcm_oss_disconnect_minor(pcm);
3197	snd_pcm_oss_proc_done(pcm);
3198	return 0;
3199}
3200
3201static struct snd_pcm_notify snd_pcm_oss_notify =
3202{
3203	.n_register =	snd_pcm_oss_register_minor,
3204	.n_disconnect = snd_pcm_oss_disconnect_minor,
3205	.n_unregister =	snd_pcm_oss_unregister_minor,
3206};
3207
3208static int __init alsa_pcm_oss_init(void)
3209{
3210	int i;
3211	int err;
3212
3213	/* check device map table */
3214	for (i = 0; i < SNDRV_CARDS; i++) {
3215		if (dsp_map[i] < 0 || dsp_map[i] >= SNDRV_PCM_DEVICES) {
3216			pr_err("ALSA: pcm_oss: invalid dsp_map[%d] = %d\n",
3217				   i, dsp_map[i]);
3218			dsp_map[i] = 0;
3219		}
3220		if (adsp_map[i] < 0 || adsp_map[i] >= SNDRV_PCM_DEVICES) {
3221			pr_err("ALSA: pcm_oss: invalid adsp_map[%d] = %d\n",
3222				   i, adsp_map[i]);
3223			adsp_map[i] = 1;
3224		}
3225	}
3226	err = snd_pcm_notify(&snd_pcm_oss_notify, 0);
3227	if (err < 0)
3228		return err;
3229	return 0;
3230}
3231
3232static void __exit alsa_pcm_oss_exit(void)
3233{
3234	snd_pcm_notify(&snd_pcm_oss_notify, 1);
3235}
3236
3237module_init(alsa_pcm_oss_init)
3238module_exit(alsa_pcm_oss_exit)
3239