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linux/sound/core/oss/pcm_oss.c
Takashi Iwai b248371628 ALSA: pcm: Fix potential deadlock in OSS emulation 
There are potential deadlocks in PCM OSS emulation code while
accessing read/write and mmap concurrently.  This comes from the
infamous mmap_sem usage in copy_from/to_user().  Namely,

   snd_pcm_oss_write() ->
     &runtime->oss.params_lock ->
        copy_to_user() ->
          &mm->mmap_sem
  mmap() ->
    &mm->mmap_sem ->
      snd_pcm_oss_mmap() ->
        &runtime->oss.params_lock

Since we can't avoid taking params_lock from mmap code path, use
trylock variant and aborts with -EAGAIN as a workaround of this AB/BA
deadlock.

BugLink: http://lkml.kernel.org/r/CACT4Y+bVrBKDG0G2_AcUgUQa+X91VKTeS4v+wN7BSHwHtqn3kQ@mail.gmail.com
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2016-02-01 12:23:29 +01:00

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/*
* Digital Audio (PCM) abstract layer / OSS compatible
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#if 0
#define PLUGIN_DEBUG
#endif
#if 0
#define OSS_DEBUG
#endif
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/math64.h>
#include <linux/string.h>
#include <linux/compat.h>
#include <sound/core.h>
#include <sound/minors.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include "pcm_plugin.h"
#include <sound/info.h>
#include <linux/soundcard.h>
#include <sound/initval.h>
#include <sound/mixer_oss.h>
#define OSS_ALSAEMULVER _SIOR ('M', 249, int)
static int dsp_map[SNDRV_CARDS];
static int adsp_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
static bool nonblock_open = 1;
MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
MODULE_DESCRIPTION("PCM OSS emulation for ALSA.");
MODULE_LICENSE("GPL");
module_param_array(dsp_map, int, NULL, 0444);
MODULE_PARM_DESC(dsp_map, "PCM device number assigned to 1st OSS device.");
module_param_array(adsp_map, int, NULL, 0444);
MODULE_PARM_DESC(adsp_map, "PCM device number assigned to 2nd OSS device.");
module_param(nonblock_open, bool, 0644);
MODULE_PARM_DESC(nonblock_open, "Don't block opening busy PCM devices.");
MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM);
MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM1);
static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file);
static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file);
static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file);
static inline mm_segment_t snd_enter_user(void)
{
mm_segment_t fs = get_fs();
set_fs(get_ds());
return fs;
}
static inline void snd_leave_user(mm_segment_t fs)
{
set_fs(fs);
}
/*
* helper functions to process hw_params
*/
static int snd_interval_refine_min(struct snd_interval *i, unsigned int min, int openmin)
{
int changed = 0;
if (i->min < min) {
i->min = min;
i->openmin = openmin;
changed = 1;
} else if (i->min == min && !i->openmin && openmin) {
i->openmin = 1;
changed = 1;
}
if (i->integer) {
if (i->openmin) {
i->min++;
i->openmin = 0;
}
}
if (snd_interval_checkempty(i)) {
snd_interval_none(i);
return -EINVAL;
}
return changed;
}
static int snd_interval_refine_max(struct snd_interval *i, unsigned int max, int openmax)
{
int changed = 0;
if (i->max > max) {
i->max = max;
i->openmax = openmax;
changed = 1;
} else if (i->max == max && !i->openmax && openmax) {
i->openmax = 1;
changed = 1;
}
if (i->integer) {
if (i->openmax) {
i->max--;
i->openmax = 0;
}
}
if (snd_interval_checkempty(i)) {
snd_interval_none(i);
return -EINVAL;
}
return changed;
}
static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
{
struct snd_interval t;
t.empty = 0;
t.min = t.max = val;
t.openmin = t.openmax = 0;
t.integer = 1;
return snd_interval_refine(i, &t);
}
/**
* snd_pcm_hw_param_value_min
* @params: the hw_params instance
* @var: parameter to retrieve
* @dir: pointer to the direction (-1,0,1) or NULL
*
* Return the minimum value for field PAR.
*/
static unsigned int
snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var, int *dir)
{
if (hw_is_mask(var)) {
if (dir)
*dir = 0;
return snd_mask_min(hw_param_mask_c(params, var));
}
if (hw_is_interval(var)) {
const struct snd_interval *i = hw_param_interval_c(params, var);
if (dir)
*dir = i->openmin;
return snd_interval_min(i);
}
return -EINVAL;
}
/**
* snd_pcm_hw_param_value_max
* @params: the hw_params instance
* @var: parameter to retrieve
* @dir: pointer to the direction (-1,0,1) or NULL
*
* Return the maximum value for field PAR.
*/
static unsigned int
snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var, int *dir)
{
if (hw_is_mask(var)) {
if (dir)
*dir = 0;
return snd_mask_max(hw_param_mask_c(params, var));
}
if (hw_is_interval(var)) {
const struct snd_interval *i = hw_param_interval_c(params, var);
if (dir)
*dir = - (int) i->openmax;
return snd_interval_max(i);
}
return -EINVAL;
}
static int _snd_pcm_hw_param_mask(struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var,
const struct snd_mask *val)
{
int changed;
changed = snd_mask_refine(hw_param_mask(params, var), val);
if (changed) {
params->cmask |= 1 << var;
params->rmask |= 1 << var;
}
return changed;
}
static int snd_pcm_hw_param_mask(struct snd_pcm_substream *pcm,
struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var,
const struct snd_mask *val)
{
int changed = _snd_pcm_hw_param_mask(params, var, val);
if (changed < 0)
return changed;
if (params->rmask) {
int err = snd_pcm_hw_refine(pcm, params);
if (err < 0)
return err;
}
return 0;
}
static int _snd_pcm_hw_param_min(struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var, unsigned int val,
int dir)
{
int changed;
int open = 0;
if (dir) {
if (dir > 0) {
open = 1;
} else if (dir < 0) {
if (val > 0) {
open = 1;
val--;
}
}
}
if (hw_is_mask(var))
changed = snd_mask_refine_min(hw_param_mask(params, var),
val + !!open);
else if (hw_is_interval(var))
changed = snd_interval_refine_min(hw_param_interval(params, var),
val, open);
else
return -EINVAL;
if (changed) {
params->cmask |= 1 << var;
params->rmask |= 1 << var;
}
return changed;
}
/**
* snd_pcm_hw_param_min
* @pcm: PCM instance
* @params: the hw_params instance
* @var: parameter to retrieve
* @val: minimal value
* @dir: pointer to the direction (-1,0,1) or NULL
*
* Inside configuration space defined by PARAMS remove from PAR all
* values < VAL. Reduce configuration space accordingly.
* Return new minimum or -EINVAL if the configuration space is empty
*/
static int snd_pcm_hw_param_min(struct snd_pcm_substream *pcm,
struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var, unsigned int val,
int *dir)
{
int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
if (changed < 0)
return changed;
if (params->rmask) {
int err = snd_pcm_hw_refine(pcm, params);
if (err < 0)
return err;
}
return snd_pcm_hw_param_value_min(params, var, dir);
}
static int _snd_pcm_hw_param_max(struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var, unsigned int val,
int dir)
{
int changed;
int open = 0;
if (dir) {
if (dir < 0) {
open = 1;
} else if (dir > 0) {
open = 1;
val++;
}
}
if (hw_is_mask(var)) {
if (val == 0 && open) {
snd_mask_none(hw_param_mask(params, var));
changed = -EINVAL;
} else
changed = snd_mask_refine_max(hw_param_mask(params, var),
val - !!open);
} else if (hw_is_interval(var))
changed = snd_interval_refine_max(hw_param_interval(params, var),
val, open);
else
return -EINVAL;
if (changed) {
params->cmask |= 1 << var;
params->rmask |= 1 << var;
}
return changed;
}
/**
* snd_pcm_hw_param_max
* @pcm: PCM instance
* @params: the hw_params instance
* @var: parameter to retrieve
* @val: maximal value
* @dir: pointer to the direction (-1,0,1) or NULL
*
* Inside configuration space defined by PARAMS remove from PAR all
* values >= VAL + 1. Reduce configuration space accordingly.
* Return new maximum or -EINVAL if the configuration space is empty
*/
static int snd_pcm_hw_param_max(struct snd_pcm_substream *pcm,
struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var, unsigned int val,
int *dir)
{
int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
if (changed < 0)
return changed;
if (params->rmask) {
int err = snd_pcm_hw_refine(pcm, params);
if (err < 0)
return err;
}
return snd_pcm_hw_param_value_max(params, var, dir);
}
static int boundary_sub(int a, int adir,
int b, int bdir,
int *c, int *cdir)
{
adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
*c = a - b;
*cdir = adir - bdir;
if (*cdir == -2) {
(*c)--;
} else if (*cdir == 2) {
(*c)++;
}
return 0;
}
static int boundary_lt(unsigned int a, int adir,
unsigned int b, int bdir)
{
if (adir < 0) {
a--;
adir = 1;
} else if (adir > 0)
adir = 1;
if (bdir < 0) {
b--;
bdir = 1;
} else if (bdir > 0)
bdir = 1;
return a < b || (a == b && adir < bdir);
}
/* Return 1 if min is nearer to best than max */
static int boundary_nearer(int min, int mindir,
int best, int bestdir,
int max, int maxdir)
{
int dmin, dmindir;
int dmax, dmaxdir;
boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
return boundary_lt(dmin, dmindir, dmax, dmaxdir);
}
/**
* snd_pcm_hw_param_near
* @pcm: PCM instance
* @params: the hw_params instance
* @var: parameter to retrieve
* @best: value to set
* @dir: pointer to the direction (-1,0,1) or NULL
*
* Inside configuration space defined by PARAMS set PAR to the available value
* nearest to VAL. Reduce configuration space accordingly.
* This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
* SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
* Return the value found.
*/
static int snd_pcm_hw_param_near(struct snd_pcm_substream *pcm,
struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var, unsigned int best,
int *dir)
{
struct snd_pcm_hw_params *save = NULL;
int v;
unsigned int saved_min;
int last = 0;
int min, max;
int mindir, maxdir;
int valdir = dir ? *dir : 0;
/* FIXME */
if (best > INT_MAX)
best = INT_MAX;
min = max = best;
mindir = maxdir = valdir;
if (maxdir > 0)
maxdir = 0;
else if (maxdir == 0)
maxdir = -1;
else {
maxdir = 1;
max--;
}
save = kmalloc(sizeof(*save), GFP_KERNEL);
if (save == NULL)
return -ENOMEM;
*save = *params;
saved_min = min;
min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
if (min >= 0) {
struct snd_pcm_hw_params *params1;
if (max < 0)
goto _end;
if ((unsigned int)min == saved_min && mindir == valdir)
goto _end;
params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
if (params1 == NULL) {
kfree(save);
return -ENOMEM;
}
*params1 = *save;
max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
if (max < 0) {
kfree(params1);
goto _end;
}
if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
*params = *params1;
last = 1;
}
kfree(params1);
} else {
*params = *save;
max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
if (max < 0) {
kfree(save);
return max;
}
last = 1;
}
_end:
kfree(save);
if (last)
v = snd_pcm_hw_param_last(pcm, params, var, dir);
else
v = snd_pcm_hw_param_first(pcm, params, var, dir);
snd_BUG_ON(v < 0);
return v;
}
static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var, unsigned int val,
int dir)
{
int changed;
if (hw_is_mask(var)) {
struct snd_mask *m = hw_param_mask(params, var);
if (val == 0 && dir < 0) {
changed = -EINVAL;
snd_mask_none(m);
} else {
if (dir > 0)
val++;
else if (dir < 0)
val--;
changed = snd_mask_refine_set(hw_param_mask(params, var), val);
}
} else if (hw_is_interval(var)) {
struct snd_interval *i = hw_param_interval(params, var);
if (val == 0 && dir < 0) {
changed = -EINVAL;
snd_interval_none(i);
} else if (dir == 0)
changed = snd_interval_refine_set(i, val);
else {
struct snd_interval t;
t.openmin = 1;
t.openmax = 1;
t.empty = 0;
t.integer = 0;
if (dir < 0) {
t.min = val - 1;
t.max = val;
} else {
t.min = val;
t.max = val+1;
}
changed = snd_interval_refine(i, &t);
}
} else
return -EINVAL;
if (changed) {
params->cmask |= 1 << var;
params->rmask |= 1 << var;
}
return changed;
}
/**
* snd_pcm_hw_param_set
* @pcm: PCM instance
* @params: the hw_params instance
* @var: parameter to retrieve
* @val: value to set
* @dir: pointer to the direction (-1,0,1) or NULL
*
* Inside configuration space defined by PARAMS remove from PAR all
* values != VAL. Reduce configuration space accordingly.
* Return VAL or -EINVAL if the configuration space is empty
*/
static int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm,
struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var, unsigned int val,
int dir)
{
int changed = _snd_pcm_hw_param_set(params, var, val, dir);
if (changed < 0)
return changed;
if (params->rmask) {
int err = snd_pcm_hw_refine(pcm, params);
if (err < 0)
return err;
}
return snd_pcm_hw_param_value(params, var, NULL);
}
static int _snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params *params,
snd_pcm_hw_param_t var)
{
int changed;
changed = snd_interval_setinteger(hw_param_interval(params, var));
if (changed) {
params->cmask |= 1 << var;
params->rmask |= 1 << var;
}
return changed;
}
/*
* plugin
*/
#ifdef CONFIG_SND_PCM_OSS_PLUGINS
static int snd_pcm_oss_plugin_clear(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_pcm_plugin *plugin, *next;
plugin = runtime->oss.plugin_first;
while (plugin) {
next = plugin->next;
snd_pcm_plugin_free(plugin);
plugin = next;
}
runtime->oss.plugin_first = runtime->oss.plugin_last = NULL;
return 0;
}
static int snd_pcm_plugin_insert(struct snd_pcm_plugin *plugin)
{
struct snd_pcm_runtime *runtime = plugin->plug->runtime;
plugin->next = runtime->oss.plugin_first;
plugin->prev = NULL;
if (runtime->oss.plugin_first) {
runtime->oss.plugin_first->prev = plugin;
runtime->oss.plugin_first = plugin;
} else {
runtime->oss.plugin_last =
runtime->oss.plugin_first = plugin;
}
return 0;
}
int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin)
{
struct snd_pcm_runtime *runtime = plugin->plug->runtime;
plugin->next = NULL;
plugin->prev = runtime->oss.plugin_last;
if (runtime->oss.plugin_last) {
runtime->oss.plugin_last->next = plugin;
runtime->oss.plugin_last = plugin;
} else {
runtime->oss.plugin_last =
runtime->oss.plugin_first = plugin;
}
return 0;
}
#endif /* CONFIG_SND_PCM_OSS_PLUGINS */
static long snd_pcm_oss_bytes(struct snd_pcm_substream *substream, long frames)
{
struct snd_pcm_runtime *runtime = substream->runtime;
long buffer_size = snd_pcm_lib_buffer_bytes(substream);
long bytes = frames_to_bytes(runtime, frames);
if (buffer_size == runtime->oss.buffer_bytes)
return bytes;
#if BITS_PER_LONG >= 64
return runtime->oss.buffer_bytes * bytes / buffer_size;
#else
{
u64 bsize = (u64)runtime->oss.buffer_bytes * (u64)bytes;
return div_u64(bsize, buffer_size);
}
#endif
}
static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes)
{
struct snd_pcm_runtime *runtime = substream->runtime;
long buffer_size = snd_pcm_lib_buffer_bytes(substream);
if (buffer_size == runtime->oss.buffer_bytes)
return bytes_to_frames(runtime, bytes);
return bytes_to_frames(runtime, (buffer_size * bytes) / runtime->oss.buffer_bytes);
}
static inline
snd_pcm_uframes_t get_hw_ptr_period(struct snd_pcm_runtime *runtime)
{
return runtime->hw_ptr_interrupt;
}
/* define extended formats in the recent OSS versions (if any) */
/* linear formats */
#define AFMT_S32_LE 0x00001000
#define AFMT_S32_BE 0x00002000
#define AFMT_S24_LE 0x00008000
#define AFMT_S24_BE 0x00010000
#define AFMT_S24_PACKED 0x00040000
/* other supported formats */
#define AFMT_FLOAT 0x00004000
#define AFMT_SPDIF_RAW 0x00020000
/* unsupported formats */
#define AFMT_AC3 0x00000400
#define AFMT_VORBIS 0x00000800
static snd_pcm_format_t snd_pcm_oss_format_from(int format)
{
switch (format) {
case AFMT_MU_LAW: return SNDRV_PCM_FORMAT_MU_LAW;
case AFMT_A_LAW: return SNDRV_PCM_FORMAT_A_LAW;
case AFMT_IMA_ADPCM: return SNDRV_PCM_FORMAT_IMA_ADPCM;
case AFMT_U8: return SNDRV_PCM_FORMAT_U8;
case AFMT_S16_LE: return SNDRV_PCM_FORMAT_S16_LE;
case AFMT_S16_BE: return SNDRV_PCM_FORMAT_S16_BE;
case AFMT_S8: return SNDRV_PCM_FORMAT_S8;
case AFMT_U16_LE: return SNDRV_PCM_FORMAT_U16_LE;
case AFMT_U16_BE: return SNDRV_PCM_FORMAT_U16_BE;
case AFMT_MPEG: return SNDRV_PCM_FORMAT_MPEG;
case AFMT_S32_LE: return SNDRV_PCM_FORMAT_S32_LE;
case AFMT_S32_BE: return SNDRV_PCM_FORMAT_S32_BE;
case AFMT_S24_LE: return SNDRV_PCM_FORMAT_S24_LE;
case AFMT_S24_BE: return SNDRV_PCM_FORMAT_S24_BE;
case AFMT_S24_PACKED: return SNDRV_PCM_FORMAT_S24_3LE;
case AFMT_FLOAT: return SNDRV_PCM_FORMAT_FLOAT;
case AFMT_SPDIF_RAW: return SNDRV_PCM_FORMAT_IEC958_SUBFRAME;
default: return SNDRV_PCM_FORMAT_U8;
}
}
static int snd_pcm_oss_format_to(snd_pcm_format_t format)
{
switch (format) {
case SNDRV_PCM_FORMAT_MU_LAW: return AFMT_MU_LAW;
case SNDRV_PCM_FORMAT_A_LAW: return AFMT_A_LAW;
case SNDRV_PCM_FORMAT_IMA_ADPCM: return AFMT_IMA_ADPCM;
case SNDRV_PCM_FORMAT_U8: return AFMT_U8;
case SNDRV_PCM_FORMAT_S16_LE: return AFMT_S16_LE;
case SNDRV_PCM_FORMAT_S16_BE: return AFMT_S16_BE;
case SNDRV_PCM_FORMAT_S8: return AFMT_S8;
case SNDRV_PCM_FORMAT_U16_LE: return AFMT_U16_LE;
case SNDRV_PCM_FORMAT_U16_BE: return AFMT_U16_BE;
case SNDRV_PCM_FORMAT_MPEG: return AFMT_MPEG;
case SNDRV_PCM_FORMAT_S32_LE: return AFMT_S32_LE;
case SNDRV_PCM_FORMAT_S32_BE: return AFMT_S32_BE;
case SNDRV_PCM_FORMAT_S24_LE: return AFMT_S24_LE;
case SNDRV_PCM_FORMAT_S24_BE: return AFMT_S24_BE;
case SNDRV_PCM_FORMAT_S24_3LE: return AFMT_S24_PACKED;
case SNDRV_PCM_FORMAT_FLOAT: return AFMT_FLOAT;
case SNDRV_PCM_FORMAT_IEC958_SUBFRAME: return AFMT_SPDIF_RAW;
default: return -EINVAL;
}
}
static int snd_pcm_oss_period_size(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *oss_params,
struct snd_pcm_hw_params *slave_params)
{
size_t s;
size_t oss_buffer_size, oss_period_size, oss_periods;
size_t min_period_size, max_period_size;
struct snd_pcm_runtime *runtime = substream->runtime;
size_t oss_frame_size;
oss_frame_size = snd_pcm_format_physical_width(params_format(oss_params)) *
params_channels(oss_params) / 8;
oss_buffer_size = snd_pcm_plug_client_size(substream,
snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, NULL)) * oss_frame_size;
oss_buffer_size = rounddown_pow_of_two(oss_buffer_size);
if (atomic_read(&substream->mmap_count)) {
if (oss_buffer_size > runtime->oss.mmap_bytes)
oss_buffer_size = runtime->oss.mmap_bytes;
}
if (substream->oss.setup.period_size > 16)
oss_period_size = substream->oss.setup.period_size;
else if (runtime->oss.fragshift) {
oss_period_size = 1 << runtime->oss.fragshift;
if (oss_period_size > oss_buffer_size / 2)
oss_period_size = oss_buffer_size / 2;
} else {
int sd;
size_t bytes_per_sec = params_rate(oss_params) * snd_pcm_format_physical_width(params_format(oss_params)) * params_channels(oss_params) / 8;
oss_period_size = oss_buffer_size;
do {
oss_period_size /= 2;
} while (oss_period_size > bytes_per_sec);
if (runtime->oss.subdivision == 0) {
sd = 4;
if (oss_period_size / sd > 4096)
sd *= 2;
if (oss_period_size / sd < 4096)
sd = 1;
} else
sd = runtime->oss.subdivision;
oss_period_size /= sd;
if (oss_period_size < 16)
oss_period_size = 16;
}
min_period_size = snd_pcm_plug_client_size(substream,
snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
min_period_size *= oss_frame_size;
min_period_size = roundup_pow_of_two(min_period_size);
if (oss_period_size < min_period_size)
oss_period_size = min_period_size;
max_period_size = snd_pcm_plug_client_size(substream,
snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
max_period_size *= oss_frame_size;
max_period_size = rounddown_pow_of_two(max_period_size);
if (oss_period_size > max_period_size)
oss_period_size = max_period_size;
oss_periods = oss_buffer_size / oss_period_size;
if (substream->oss.setup.periods > 1)
oss_periods = substream->oss.setup.periods;
s = snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
if (runtime->oss.maxfrags && s > runtime->oss.maxfrags)
s = runtime->oss.maxfrags;
if (oss_periods > s)
oss_periods = s;
s = snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
if (s < 2)
s = 2;
if (oss_periods < s)
oss_periods = s;
while (oss_period_size * oss_periods > oss_buffer_size)
oss_period_size /= 2;
if (oss_period_size < 16)
return -EINVAL;
runtime->oss.period_bytes = oss_period_size;
runtime->oss.period_frames = 1;
runtime->oss.periods = oss_periods;
return 0;
}
static int choose_rate(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params, unsigned int best_rate)
{
struct snd_interval *it;
struct snd_pcm_hw_params *save;
unsigned int rate, prev;
save = kmalloc(sizeof(*save), GFP_KERNEL);
if (save == NULL)
return -ENOMEM;
*save = *params;
it = hw_param_interval(save, SNDRV_PCM_HW_PARAM_RATE);
/* try multiples of the best rate */
rate = best_rate;
for (;;) {
if (it->max < rate || (it->max == rate && it->openmax))
break;
if (it->min < rate || (it->min == rate && !it->openmin)) {
int ret;
ret = snd_pcm_hw_param_set(substream, params,
SNDRV_PCM_HW_PARAM_RATE,
rate, 0);
if (ret == (int)rate) {
kfree(save);
return rate;
}
*params = *save;
}
prev = rate;
rate += best_rate;
if (rate <= prev)
break;
}
/* not found, use the nearest rate */
kfree(save);
return snd_pcm_hw_param_near(substream, params, SNDRV_PCM_HW_PARAM_RATE, best_rate, NULL);
}
static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
bool trylock)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_pcm_hw_params *params, *sparams;
struct snd_pcm_sw_params *sw_params;
ssize_t oss_buffer_size, oss_period_size;
size_t oss_frame_size;
int err;
int direct;
snd_pcm_format_t format, sformat;
int n;
struct snd_mask sformat_mask;
struct snd_mask mask;
if (trylock) {
if (!(mutex_trylock(&runtime->oss.params_lock)))
return -EAGAIN;
} else if (mutex_lock_interruptible(&runtime->oss.params_lock))
return -EINTR;
sw_params = kzalloc(sizeof(*sw_params), GFP_KERNEL);
params = kmalloc(sizeof(*params), GFP_KERNEL);
sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
if (!sw_params || !params || !sparams) {
err = -ENOMEM;
goto failure;
}
if (atomic_read(&substream->mmap_count))
direct = 1;
else
direct = substream->oss.setup.direct;
_snd_pcm_hw_params_any(sparams);
_snd_pcm_hw_param_setinteger(sparams, SNDRV_PCM_HW_PARAM_PERIODS);
_snd_pcm_hw_param_min(sparams, SNDRV_PCM_HW_PARAM_PERIODS, 2, 0);
snd_mask_none(&mask);
if (atomic_read(&substream->mmap_count))
snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
else {
snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED);
if (!direct)
snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
}
err = snd_pcm_hw_param_mask(substream, sparams, SNDRV_PCM_HW_PARAM_ACCESS, &mask);
if (err < 0) {
pcm_dbg(substream->pcm, "No usable accesses\n");
err = -EINVAL;
goto failure;
}
choose_rate(substream, sparams, runtime->oss.rate);
snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_CHANNELS, runtime->oss.channels, NULL);
format = snd_pcm_oss_format_from(runtime->oss.format);
sformat_mask = *hw_param_mask(sparams, SNDRV_PCM_HW_PARAM_FORMAT);
if (direct)
sformat = format;
else
sformat = snd_pcm_plug_slave_format(format, &sformat_mask);
if ((__force int)sformat < 0 ||
!snd_mask_test(&sformat_mask, (__force int)sformat)) {
for (sformat = (__force snd_pcm_format_t)0;
(__force int)sformat <= (__force int)SNDRV_PCM_FORMAT_LAST;
sformat = (__force snd_pcm_format_t)((__force int)sformat + 1)) {
if (snd_mask_test(&sformat_mask, (__force int)sformat) &&
snd_pcm_oss_format_to(sformat) >= 0)
break;
}
if ((__force int)sformat > (__force int)SNDRV_PCM_FORMAT_LAST) {
pcm_dbg(substream->pcm, "Cannot find a format!!!\n");
err = -EINVAL;
goto failure;
}
}
err = _snd_pcm_hw_param_set(sparams, SNDRV_PCM_HW_PARAM_FORMAT, (__force int)sformat, 0);
if (err < 0)
goto failure;
if (direct) {
memcpy(params, sparams, sizeof(*params));
} else {
_snd_pcm_hw_params_any(params);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
(__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED, 0);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
(__force int)snd_pcm_oss_format_from(runtime->oss.format), 0);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
runtime->oss.channels, 0);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
runtime->oss.rate, 0);
pdprintf("client: access = %i, format = %i, channels = %i, rate = %i\n",
params_access(params), params_format(params),
params_channels(params), params_rate(params));
}
pdprintf("slave: access = %i, format = %i, channels = %i, rate = %i\n",
params_access(sparams), params_format(sparams),
params_channels(sparams), params_rate(sparams));
oss_frame_size = snd_pcm_format_physical_width(params_format(params)) *
params_channels(params) / 8;
#ifdef CONFIG_SND_PCM_OSS_PLUGINS
snd_pcm_oss_plugin_clear(substream);
if (!direct) {
/* add necessary plugins */
snd_pcm_oss_plugin_clear(substream);
if ((err = snd_pcm_plug_format_plugins(substream,
params,
sparams)) < 0) {
pcm_dbg(substream->pcm,
"snd_pcm_plug_format_plugins failed: %i\n", err);
snd_pcm_oss_plugin_clear(substream);
goto failure;
}
if (runtime->oss.plugin_first) {
struct snd_pcm_plugin *plugin;
if ((err = snd_pcm_plugin_build_io(substream, sparams, &plugin)) < 0) {
pcm_dbg(substream->pcm,
"snd_pcm_plugin_build_io failed: %i\n", err);
snd_pcm_oss_plugin_clear(substream);
goto failure;
}
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
err = snd_pcm_plugin_append(plugin);
} else {
err = snd_pcm_plugin_insert(plugin);
}
if (err < 0) {
snd_pcm_oss_plugin_clear(substream);
goto failure;
}
}
}
#endif
err = snd_pcm_oss_period_size(substream, params, sparams);
if (err < 0)
goto failure;
n = snd_pcm_plug_slave_size(substream, runtime->oss.period_bytes / oss_frame_size);
err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, n, NULL);
if (err < 0)
goto failure;
err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIODS,
runtime->oss.periods, NULL);
if (err < 0)
goto failure;
snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
if ((err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, sparams)) < 0) {
pcm_dbg(substream->pcm, "HW_PARAMS failed: %i\n", err);
goto failure;
}
if (runtime->oss.trigger) {
sw_params->start_threshold = 1;
} else {
sw_params->start_threshold = runtime->boundary;
}
if (atomic_read(&substream->mmap_count) ||
substream->stream == SNDRV_PCM_STREAM_CAPTURE)
sw_params->stop_threshold = runtime->boundary;
else
sw_params->stop_threshold = runtime->buffer_size;
sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
sw_params->period_step = 1;
sw_params->avail_min = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
1 : runtime->period_size;
if (atomic_read(&substream->mmap_count) ||
substream->oss.setup.nosilence) {
sw_params->silence_threshold = 0;
sw_params->silence_size = 0;
} else {
snd_pcm_uframes_t frames;
frames = runtime->period_size + 16;
if (frames > runtime->buffer_size)
frames = runtime->buffer_size;
sw_params->silence_threshold = frames;
sw_params->silence_size = frames;
}
if ((err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_SW_PARAMS, sw_params)) < 0) {
pcm_dbg(substream->pcm, "SW_PARAMS failed: %i\n", err);
goto failure;
}
runtime->oss.periods = params_periods(sparams);
oss_period_size = snd_pcm_plug_client_size(substream, params_period_size(sparams));
if (oss_period_size < 0) {
err = -EINVAL;
goto failure;
}
#ifdef CONFIG_SND_PCM_OSS_PLUGINS
if (runtime->oss.plugin_first) {
err = snd_pcm_plug_alloc(substream, oss_period_size);
if (err < 0)
goto failure;
}
#endif
oss_period_size *= oss_frame_size;
oss_buffer_size = oss_period_size * runtime->oss.periods;
if (oss_buffer_size < 0) {
err = -EINVAL;
goto failure;
}
runtime->oss.period_bytes = oss_period_size;
runtime->oss.buffer_bytes = oss_buffer_size;
pdprintf("oss: period bytes = %i, buffer bytes = %i\n",
runtime->oss.period_bytes,
runtime->oss.buffer_bytes);
pdprintf("slave: period_size = %i, buffer_size = %i\n",
params_period_size(sparams),
params_buffer_size(sparams));
runtime->oss.format = snd_pcm_oss_format_to(params_format(params));
runtime->oss.channels = params_channels(params);
runtime->oss.rate = params_rate(params);
vfree(runtime->oss.buffer);
runtime->oss.buffer = vmalloc(runtime->oss.period_bytes);
if (!runtime->oss.buffer) {
err = -ENOMEM;
goto failure;
}
runtime->oss.params = 0;
runtime->oss.prepare = 1;
runtime->oss.buffer_used = 0;
if (runtime->dma_area)
snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes));
runtime->oss.period_frames = snd_pcm_alsa_frames(substream, oss_period_size);
err = 0;
failure:
kfree(sw_params);
kfree(params);
kfree(sparams);
mutex_unlock(&runtime->oss.params_lock);
return err;
}
static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream)
{
int idx, err;
struct snd_pcm_substream *asubstream = NULL, *substream;
for (idx = 0; idx < 2; idx++) {
substream = pcm_oss_file->streams[idx];
if (substream == NULL)
continue;
if (asubstream == NULL)
asubstream = substream;
if (substream->runtime->oss.params) {
err = snd_pcm_oss_change_params(substream, false);
if (err < 0)
return err;
}
}
if (!asubstream)
return -EIO;
if (r_substream)
*r_substream = asubstream;
return 0;
}
static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
{
int err;
struct snd_pcm_runtime *runtime = substream->runtime;
err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
if (err < 0) {
pcm_dbg(substream->pcm,
"snd_pcm_oss_prepare: SNDRV_PCM_IOCTL_PREPARE failed\n");
return err;
}
runtime->oss.prepare = 0;
runtime->oss.prev_hw_ptr_period = 0;
runtime->oss.period_ptr = 0;
runtime->oss.buffer_used = 0;
return 0;
}
static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime;
int err;
if (substream == NULL)
return 0;
runtime = substream->runtime;
if (runtime->oss.params) {
err = snd_pcm_oss_change_params(substream, false);
if (err < 0)
return err;
}
if (runtime->oss.prepare) {
err = snd_pcm_oss_prepare(substream);
if (err < 0)
return err;
}
return 0;
}
static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay)
{
struct snd_pcm_runtime *runtime;
snd_pcm_uframes_t frames;
int err = 0;
while (1) {
err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, delay);
if (err < 0)
break;
runtime = substream->runtime;
if (*delay <= (snd_pcm_sframes_t)runtime->buffer_size)
break;
/* in case of overrun, skip whole periods like OSS/Linux driver does */
/* until avail(delay) <= buffer_size */
frames = (*delay - runtime->buffer_size) + runtime->period_size - 1;
frames /= runtime->period_size;
frames *= runtime->period_size;
err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_FORWARD, &frames);
if (err < 0)
break;
}
return err;
}
snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel)
{
struct snd_pcm_runtime *runtime = substream->runtime;
int ret;
while (1) {
if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
#ifdef OSS_DEBUG
pcm_dbg(substream->pcm,
"pcm_oss: write: recovering from %s\n",
runtime->status->state == SNDRV_PCM_STATE_XRUN ?
"XRUN" : "SUSPEND");
#endif
ret = snd_pcm_oss_prepare(substream);
if (ret < 0)
break;
}
if (in_kernel) {
mm_segment_t fs;
fs = snd_enter_user();
ret = snd_pcm_lib_write(substream, (void __force __user *)ptr, frames);
snd_leave_user(fs);
} else {
ret = snd_pcm_lib_write(substream, (void __force __user *)ptr, frames);
}
if (ret != -EPIPE && ret != -ESTRPIPE)
break;
/* test, if we can't store new data, because the stream */
/* has not been started */
if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
return -EAGAIN;
}
return ret;
}
snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_sframes_t delay;
int ret;
while (1) {
if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
#ifdef OSS_DEBUG
pcm_dbg(substream->pcm,
"pcm_oss: read: recovering from %s\n",
runtime->status->state == SNDRV_PCM_STATE_XRUN ?
"XRUN" : "SUSPEND");
#endif
ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
if (ret < 0)
break;
} else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
ret = snd_pcm_oss_prepare(substream);
if (ret < 0)
break;
}
ret = snd_pcm_oss_capture_position_fixup(substream, &delay);
if (ret < 0)
break;
if (in_kernel) {
mm_segment_t fs;
fs = snd_enter_user();
ret = snd_pcm_lib_read(substream, (void __force __user *)ptr, frames);
snd_leave_user(fs);
} else {
ret = snd_pcm_lib_read(substream, (void __force __user *)ptr, frames);
}
if (ret == -EPIPE) {
if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
if (ret < 0)
break;
}
continue;
}
if (ret != -ESTRPIPE)
break;
}
return ret;
}
snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames, int in_kernel)
{
struct snd_pcm_runtime *runtime = substream->runtime;
int ret;
while (1) {
if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
#ifdef OSS_DEBUG
pcm_dbg(substream->pcm,
"pcm_oss: writev: recovering from %s\n",
runtime->status->state == SNDRV_PCM_STATE_XRUN ?
"XRUN" : "SUSPEND");
#endif
ret = snd_pcm_oss_prepare(substream);
if (ret < 0)
break;
}
if (in_kernel) {
mm_segment_t fs;
fs = snd_enter_user();
ret = snd_pcm_lib_writev(substream, (void __user **)bufs, frames);
snd_leave_user(fs);
} else {
ret = snd_pcm_lib_writev(substream, (void __user **)bufs, frames);
}
if (ret != -EPIPE && ret != -ESTRPIPE)
break;
/* test, if we can't store new data, because the stream */
/* has not been started */
if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
return -EAGAIN;
}
return ret;
}
snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames, int in_kernel)
{
struct snd_pcm_runtime *runtime = substream->runtime;
int ret;
while (1) {
if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
#ifdef OSS_DEBUG
pcm_dbg(substream->pcm,
"pcm_oss: readv: recovering from %s\n",
runtime->status->state == SNDRV_PCM_STATE_XRUN ?
"XRUN" : "SUSPEND");
#endif
ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
if (ret < 0)
break;
} else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
ret = snd_pcm_oss_prepare(substream);
if (ret < 0)
break;
}
if (in_kernel) {
mm_segment_t fs;
fs = snd_enter_user();
ret = snd_pcm_lib_readv(substream, (void __user **)bufs, frames);
snd_leave_user(fs);
} else {
ret = snd_pcm_lib_readv(substream, (void __user **)bufs, frames);
}
if (ret != -EPIPE && ret != -ESTRPIPE)
break;
}
return ret;
}
static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_sframes_t frames, frames1;
#ifdef CONFIG_SND_PCM_OSS_PLUGINS
if (runtime->oss.plugin_first) {
struct snd_pcm_plugin_channel *channels;
size_t oss_frame_bytes = (runtime->oss.plugin_first->src_width * runtime->oss.plugin_first->src_format.channels) / 8;
if (!in_kernel) {
if (copy_from_user(runtime->oss.buffer, (const char __force __user *)buf, bytes))
return -EFAULT;
buf = runtime->oss.buffer;
}
frames = bytes / oss_frame_bytes;
frames1 = snd_pcm_plug_client_channels_buf(substream, (char *)buf, frames, &channels);
if (frames1 < 0)
return frames1;
frames1 = snd_pcm_plug_write_transfer(substream, channels, frames1);
if (frames1 <= 0)
return frames1;
bytes = frames1 * oss_frame_bytes;
} else
#endif
{
frames = bytes_to_frames(runtime, bytes);
frames1 = snd_pcm_oss_write3(substream, buf, frames, in_kernel);
if (frames1 <= 0)
return frames1;
bytes = frames_to_bytes(runtime, frames1);
}
return bytes;
}
static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes)
{
size_t xfer = 0;
ssize_t tmp;
struct snd_pcm_runtime *runtime = substream->runtime;
if (atomic_read(&substream->mmap_count))
return -ENXIO;
if ((tmp = snd_pcm_oss_make_ready(substream)) < 0)
return tmp;
mutex_lock(&runtime->oss.params_lock);
while (bytes > 0) {
if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
tmp = bytes;
if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
tmp = runtime->oss.period_bytes - runtime->oss.buffer_used;
if (tmp > 0) {
if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp)) {
tmp = -EFAULT;
goto err;
}
}
runtime->oss.buffer_used += tmp;
buf += tmp;
bytes -= tmp;
xfer += tmp;
if (substream->oss.setup.partialfrag ||
runtime->oss.buffer_used == runtime->oss.period_bytes) {
tmp = snd_pcm_oss_write2(substream, runtime->oss.buffer + runtime->oss.period_ptr,
runtime->oss.buffer_used - runtime->oss.period_ptr, 1);
if (tmp <= 0)
goto err;
runtime->oss.bytes += tmp;
runtime->oss.period_ptr += tmp;
runtime->oss.period_ptr %= runtime->oss.period_bytes;
if (runtime->oss.period_ptr == 0 ||
runtime->oss.period_ptr == runtime->oss.buffer_used)
runtime->oss.buffer_used = 0;
else if ((substream->f_flags & O_NONBLOCK) != 0) {
tmp = -EAGAIN;
goto err;
}
}
} else {
tmp = snd_pcm_oss_write2(substream,
(const char __force *)buf,
runtime->oss.period_bytes, 0);
if (tmp <= 0)
goto err;
runtime->oss.bytes += tmp;
buf += tmp;
bytes -= tmp;
xfer += tmp;
if ((substream->f_flags & O_NONBLOCK) != 0 &&
tmp != runtime->oss.period_bytes)
break;
}
}
mutex_unlock(&runtime->oss.params_lock);
return xfer;
err:
mutex_unlock(&runtime->oss.params_lock);
return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
}
static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_sframes_t frames, frames1;
#ifdef CONFIG_SND_PCM_OSS_PLUGINS
char __user *final_dst = (char __force __user *)buf;
if (runtime->oss.plugin_first) {
struct snd_pcm_plugin_channel *channels;
size_t oss_frame_bytes = (runtime->oss.plugin_last->dst_width * runtime->oss.plugin_last->dst_format.channels) / 8;
if (!in_kernel)
buf = runtime->oss.buffer;
frames = bytes / oss_frame_bytes;
frames1 = snd_pcm_plug_client_channels_buf(substream, buf, frames, &channels);
if (frames1 < 0)
return frames1;
frames1 = snd_pcm_plug_read_transfer(substream, channels, frames1);
if (frames1 <= 0)
return frames1;
bytes = frames1 * oss_frame_bytes;
if (!in_kernel && copy_to_user(final_dst, buf, bytes))
return -EFAULT;
} else
#endif
{
frames = bytes_to_frames(runtime, bytes);
frames1 = snd_pcm_oss_read3(substream, buf, frames, in_kernel);
if (frames1 <= 0)
return frames1;
bytes = frames_to_bytes(runtime, frames1);
}
return bytes;
}
static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes)
{
size_t xfer = 0;
ssize_t tmp;
struct snd_pcm_runtime *runtime = substream->runtime;
if (atomic_read(&substream->mmap_count))
return -ENXIO;
if ((tmp = snd_pcm_oss_make_ready(substream)) < 0)
return tmp;
mutex_lock(&runtime->oss.params_lock);
while (bytes > 0) {
if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
if (runtime->oss.buffer_used == 0) {
tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1);
if (tmp <= 0)
goto err;
runtime->oss.bytes += tmp;
runtime->oss.period_ptr = tmp;
runtime->oss.buffer_used = tmp;
}
tmp = bytes;
if ((size_t) tmp > runtime->oss.buffer_used)
tmp = runtime->oss.buffer_used;
if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp)) {
tmp = -EFAULT;
goto err;
}
buf += tmp;
bytes -= tmp;
xfer += tmp;
runtime->oss.buffer_used -= tmp;
} else {
tmp = snd_pcm_oss_read2(substream, (char __force *)buf,
runtime->oss.period_bytes, 0);
if (tmp <= 0)
goto err;
runtime->oss.bytes += tmp;
buf += tmp;
bytes -= tmp;
xfer += tmp;
}
}
mutex_unlock(&runtime->oss.params_lock);
return xfer;
err:
mutex_unlock(&runtime->oss.params_lock);
return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
}
static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
{
struct snd_pcm_substream *substream;
struct snd_pcm_runtime *runtime;
int i;
for (i = 0; i < 2; i++) {
substream = pcm_oss_file->streams[i];
if (!substream)
continue;
runtime = substream->runtime;
snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
runtime->oss.prepare = 1;
runtime->oss.buffer_used = 0;
runtime->oss.prev_hw_ptr_period = 0;
runtime->oss.period_ptr = 0;
}
return 0;
}
static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file)
{
struct snd_pcm_substream *substream;
int err;
substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
if (substream != NULL) {
if ((err = snd_pcm_oss_make_ready(substream)) < 0)
return err;
snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL);
}
/* note: all errors from the start action are ignored */
/* OSS apps do not know, how to handle them */
return 0;
}
static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size)
{
struct snd_pcm_runtime *runtime;
ssize_t result = 0;
snd_pcm_state_t state;
long res;
wait_queue_t wait;
runtime = substream->runtime;
init_waitqueue_entry(&wait, current);
add_wait_queue(&runtime->sleep, &wait);
#ifdef OSS_DEBUG
pcm_dbg(substream->pcm, "sync1: size = %li\n", size);
#endif
while (1) {
result = snd_pcm_oss_write2(substream, runtime->oss.buffer, size, 1);
if (result > 0) {
runtime->oss.buffer_used = 0;
result = 0;
break;
}
if (result != 0 && result != -EAGAIN)
break;
result = 0;
set_current_state(TASK_INTERRUPTIBLE);
snd_pcm_stream_lock_irq(substream);
state = runtime->status->state;
snd_pcm_stream_unlock_irq(substream);
if (state != SNDRV_PCM_STATE_RUNNING) {
set_current_state(TASK_RUNNING);
break;
}
res = schedule_timeout(10 * HZ);
if (signal_pending(current)) {
result = -ERESTARTSYS;
break;
}
if (res == 0) {
pcm_err(substream->pcm,
"OSS sync error - DMA timeout\n");
result = -EIO;
break;
}
}
remove_wait_queue(&runtime->sleep, &wait);
return result;
}
static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
{
int err = 0;
unsigned int saved_f_flags;
struct snd_pcm_substream *substream;
struct snd_pcm_runtime *runtime;
snd_pcm_format_t format;
unsigned long width;
size_t size;
substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
if (substream != NULL) {
runtime = substream->runtime;
if (atomic_read(&substream->mmap_count))
goto __direct;
if ((err = snd_pcm_oss_make_ready(substream)) < 0)
return err;
format = snd_pcm_oss_format_from(runtime->oss.format);
width = snd_pcm_format_physical_width(format);
mutex_lock(&runtime->oss.params_lock);
if (runtime->oss.buffer_used > 0) {
#ifdef OSS_DEBUG
pcm_dbg(substream->pcm, "sync: buffer_used\n");
#endif
size = (8 * (runtime->oss.period_bytes - runtime->oss.buffer_used) + 7) / width;
snd_pcm_format_set_silence(format,
runtime->oss.buffer + runtime->oss.buffer_used,
size);
err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes);
if (err < 0) {
mutex_unlock(&runtime->oss.params_lock);
return err;
}
} else if (runtime->oss.period_ptr > 0) {
#ifdef OSS_DEBUG
pcm_dbg(substream->pcm, "sync: period_ptr\n");
#endif
size = runtime->oss.period_bytes - runtime->oss.period_ptr;
snd_pcm_format_set_silence(format,
runtime->oss.buffer,
size * 8 / width);
err = snd_pcm_oss_sync1(substream, size);
if (err < 0) {
mutex_unlock(&runtime->oss.params_lock);
return err;
}
}
/*
* The ALSA's period might be a bit large than OSS one.
* Fill the remain portion of ALSA period with zeros.
*/
size = runtime->control->appl_ptr % runtime->period_size;
if (size > 0) {
size = runtime->period_size - size;
if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
size = (runtime->frame_bits * size) / 8;
while (size > 0) {
mm_segment_t fs;
size_t size1 = size < runtime->oss.period_bytes ? size : runtime->oss.period_bytes;
size -= size1;
size1 *= 8;
size1 /= runtime->sample_bits;
snd_pcm_format_set_silence(runtime->format,
runtime->oss.buffer,
size1);
size1 /= runtime->channels; /* frames */
fs = snd_enter_user();
snd_pcm_lib_write(substream, (void __force __user *)runtime->oss.buffer, size1);
snd_leave_user(fs);
}
} else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) {
void __user *buffers[runtime->channels];
memset(buffers, 0, runtime->channels * sizeof(void *));
snd_pcm_lib_writev(substream, buffers, size);
}
}
mutex_unlock(&runtime->oss.params_lock);
/*
* finish sync: drain the buffer
*/
__direct:
saved_f_flags = substream->f_flags;
substream->f_flags &= ~O_NONBLOCK;
err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
substream->f_flags = saved_f_flags;
if (err < 0)
return err;
runtime->oss.prepare = 1;
}
substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
if (substream != NULL) {
if ((err = snd_pcm_oss_make_ready(substream)) < 0)
return err;
runtime = substream->runtime;
err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
if (err < 0)
return err;
runtime->oss.buffer_used = 0;
runtime->oss.prepare = 1;
}
return 0;
}
static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)
{
int idx;
for (idx = 1; idx >= 0; --idx) {
struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
struct snd_pcm_runtime *runtime;
if (substream == NULL)
continue;
runtime = substream->runtime;
if (rate < 1000)
rate = 1000;
else if (rate > 192000)
rate = 192000;
if (runtime->oss.rate != rate) {
runtime->oss.params = 1;
runtime->oss.rate = rate;
}
}
return snd_pcm_oss_get_rate(pcm_oss_file);
}
static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file)
{
struct snd_pcm_substream *substream;
int err;
if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
return err;
return substream->runtime->oss.rate;
}
static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels)
{
int idx;
if (channels < 1)
channels = 1;
if (channels > 128)
return -EINVAL;
for (idx = 1; idx >= 0; --idx) {
struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
struct snd_pcm_runtime *runtime;
if (substream == NULL)
continue;
runtime = substream->runtime;
if (runtime->oss.channels != channels) {
runtime->oss.params = 1;
runtime->oss.channels = channels;
}
}
return snd_pcm_oss_get_channels(pcm_oss_file);
}
static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file)
{
struct snd_pcm_substream *substream;
int err;
if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
return err;
return substream->runtime->oss.channels;
}
static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file)
{
struct snd_pcm_substream *substream;
int err;
if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
return err;
return substream->runtime->oss.period_bytes;
}
static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file)
{
struct snd_pcm_substream *substream;
int err;
int direct;
struct snd_pcm_hw_params *params;
unsigned int formats = 0;
struct snd_mask format_mask;
int fmt;
if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
return err;
if (atomic_read(&substream->mmap_count))
direct = 1;
else
direct = substream->oss.setup.direct;
if (!direct)
return AFMT_MU_LAW | AFMT_U8 |
AFMT_S16_LE | AFMT_S16_BE |
AFMT_S8 | AFMT_U16_LE |
AFMT_U16_BE |
AFMT_S32_LE | AFMT_S32_BE |
AFMT_S24_LE | AFMT_S24_BE |
AFMT_S24_PACKED;
params = kmalloc(sizeof(*params), GFP_KERNEL);
if (!params)
return -ENOMEM;
_snd_pcm_hw_params_any(params);
err = snd_pcm_hw_refine(substream, params);
format_mask = *hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
kfree(params);
if (err < 0)
return err;
for (fmt = 0; fmt < 32; ++fmt) {
if (snd_mask_test(&format_mask, fmt)) {
int f = snd_pcm_oss_format_to(fmt);
if (f >= 0)
formats |= f;
}
}
return formats;
}
static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format)
{
int formats, idx;
if (format != AFMT_QUERY) {
formats = snd_pcm_oss_get_formats(pcm_oss_file);
if (formats < 0)
return formats;
if (!(formats & format))
format = AFMT_U8;
for (idx = 1; idx >= 0; --idx) {
struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
struct snd_pcm_runtime *runtime;
if (substream == NULL)
continue;
runtime = substream->runtime;
if (runtime->oss.format != format) {
runtime->oss.params = 1;
runtime->oss.format = format;
}
}
}
return snd_pcm_oss_get_format(pcm_oss_file);
}
static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file)
{
struct snd_pcm_substream *substream;
int err;
if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
return err;
return substream->runtime->oss.format;
}
static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide)
{
struct snd_pcm_runtime *runtime;
if (substream == NULL)
return 0;
runtime = substream->runtime;
if (subdivide == 0) {
subdivide = runtime->oss.subdivision;
if (subdivide == 0)
subdivide = 1;
return subdivide;
}
if (runtime->oss.subdivision || runtime->oss.fragshift)
return -EINVAL;
if (subdivide != 1 && subdivide != 2 && subdivide != 4 &&
subdivide != 8 && subdivide != 16)
return -EINVAL;
runtime->oss.subdivision = subdivide;
runtime->oss.params = 1;
return subdivide;
}
static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide)
{
int err = -EINVAL, idx;
for (idx = 1; idx >= 0; --idx) {
struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
if (substream == NULL)
continue;
if ((err = snd_pcm_oss_set_subdivide1(substream, subdivide)) < 0)
return err;
}
return err;
}
static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val)
{
struct snd_pcm_runtime *runtime;
if (substream == NULL)
return 0;
runtime = substream->runtime;
if (runtime->oss.subdivision || runtime->oss.fragshift)
return -EINVAL;
runtime->oss.fragshift = val & 0xffff;
runtime->oss.maxfrags = (val >> 16) & 0xffff;
if (runtime->oss.fragshift < 4) /* < 16 */
runtime->oss.fragshift = 4;
if (runtime->oss.maxfrags < 2)
runtime->oss.maxfrags = 2;
runtime->oss.params = 1;
return 0;
}
static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val)
{
int err = -EINVAL, idx;
for (idx = 1; idx >= 0; --idx) {
struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
if (substream == NULL)
continue;
if ((err = snd_pcm_oss_set_fragment1(substream, val)) < 0)
return err;
}
return err;
}
static int snd_pcm_oss_nonblock(struct file * file)
{
spin_lock(&file->f_lock);
file->f_flags |= O_NONBLOCK;
spin_unlock(&file->f_lock);
return 0;
}
static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res)
{
if (substream == NULL) {
res &= ~DSP_CAP_DUPLEX;
return res;
}
#ifdef DSP_CAP_MULTI
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
if (substream->pstr->substream_count > 1)
res |= DSP_CAP_MULTI;
#endif
/* DSP_CAP_REALTIME is set all times: */
/* all ALSA drivers can return actual pointer in ring buffer */
#if defined(DSP_CAP_REALTIME) && 0
{
struct snd_pcm_runtime *runtime = substream->runtime;
if (runtime->info & (SNDRV_PCM_INFO_BLOCK_TRANSFER|SNDRV_PCM_INFO_BATCH))
res &= ~DSP_CAP_REALTIME;
}
#endif
return res;
}
static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)
{
int result, idx;
result = DSP_CAP_TRIGGER | DSP_CAP_MMAP | DSP_CAP_DUPLEX | DSP_CAP_REALTIME;
for (idx = 0; idx < 2; idx++) {
struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
result = snd_pcm_oss_get_caps1(substream, result);
}
result |= 0x0001; /* revision - same as SB AWE 64 */
return result;
}
static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
snd_pcm_uframes_t hw_ptr)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_uframes_t appl_ptr;
appl_ptr = hw_ptr + runtime->buffer_size;
appl_ptr %= runtime->boundary;
runtime->control->appl_ptr = appl_ptr;
}
static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger)
{
struct snd_pcm_runtime *runtime;
struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
int err, cmd;
#ifdef OSS_DEBUG
pcm_dbg(substream->pcm, "pcm_oss: trigger = 0x%x\n", trigger);
#endif
psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
if (psubstream) {
if ((err = snd_pcm_oss_make_ready(psubstream)) < 0)
return err;
}
if (csubstream) {
if ((err = snd_pcm_oss_make_ready(csubstream)) < 0)
return err;
}
if (psubstream) {
runtime = psubstream->runtime;
if (trigger & PCM_ENABLE_OUTPUT) {
if (runtime->oss.trigger)
goto _skip1;
if (atomic_read(&psubstream->mmap_count))
snd_pcm_oss_simulate_fill(psubstream,
get_hw_ptr_period(runtime));
runtime->oss.trigger = 1;
runtime->start_threshold = 1;
cmd = SNDRV_PCM_IOCTL_START;
} else {
if (!runtime->oss.trigger)
goto _skip1;
runtime->oss.trigger = 0;
runtime->start_threshold = runtime->boundary;
cmd = SNDRV_PCM_IOCTL_DROP;
runtime->oss.prepare = 1;
}
err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL);
if (err < 0)
return err;
}
_skip1:
if (csubstream) {
runtime = csubstream->runtime;
if (trigger & PCM_ENABLE_INPUT) {
if (runtime->oss.trigger)
goto _skip2;
runtime->oss.trigger = 1;
runtime->start_threshold = 1;
cmd = SNDRV_PCM_IOCTL_START;
} else {
if (!runtime->oss.trigger)
goto _skip2;
runtime->oss.trigger = 0;
runtime->start_threshold = runtime->boundary;
cmd = SNDRV_PCM_IOCTL_DROP;
runtime->oss.prepare = 1;
}
err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL);
if (err < 0)
return err;
}
_skip2:
return 0;
}
static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file)
{
struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
int result = 0;
psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
if (psubstream && psubstream->runtime && psubstream->runtime->oss.trigger)
result |= PCM_ENABLE_OUTPUT;
if (csubstream && csubstream->runtime && csubstream->runtime->oss.trigger)
result |= PCM_ENABLE_INPUT;
return result;
}
static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file)
{
struct snd_pcm_substream *substream;
struct snd_pcm_runtime *runtime;
snd_pcm_sframes_t delay;
int err;
substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
if (substream == NULL)
return -EINVAL;
if ((err = snd_pcm_oss_make_ready(substream)) < 0)
return err;
runtime = substream->runtime;
if (runtime->oss.params || runtime->oss.prepare)
return 0;
err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
if (err == -EPIPE)
delay = 0; /* hack for broken OSS applications */
else if (err < 0)
return err;
return snd_pcm_oss_bytes(substream, delay);
}
static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info)
{
struct snd_pcm_substream *substream;
struct snd_pcm_runtime *runtime;
snd_pcm_sframes_t delay;
int fixup;
struct count_info info;
int err;
if (_info == NULL)
return -EFAULT;
substream = pcm_oss_file->streams[stream];
if (substream == NULL)
return -EINVAL;
if ((err = snd_pcm_oss_make_ready(substream)) < 0)
return err;
runtime = substream->runtime;
if (runtime->oss.params || runtime->oss.prepare) {
memset(&info, 0, sizeof(info));
if (copy_to_user(_info, &info, sizeof(info)))
return -EFAULT;
return 0;
}
if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
if (err == -EPIPE || err == -ESTRPIPE || (! err && delay < 0)) {
err = 0;
delay = 0;
fixup = 0;
} else {
fixup = runtime->oss.buffer_used;
}
} else {
err = snd_pcm_oss_capture_position_fixup(substream, &delay);
fixup = -runtime->oss.buffer_used;
}
if (err < 0)
return err;
info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size);
if (atomic_read(&substream->mmap_count)) {
snd_pcm_sframes_t n;
delay = get_hw_ptr_period(runtime);
n = delay - runtime->oss.prev_hw_ptr_period;
if (n < 0)
n += runtime->boundary;
info.blocks = n / runtime->period_size;
runtime->oss.prev_hw_ptr_period = delay;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
snd_pcm_oss_simulate_fill(substream, delay);
info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
} else {
delay = snd_pcm_oss_bytes(substream, delay);
if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
if (substream->oss.setup.buggyptr)
info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
else
info.blocks = (delay + fixup) / runtime->oss.period_bytes;
info.bytes = (runtime->oss.bytes - delay) & INT_MAX;
} else {
delay += fixup;
info.blocks = delay / runtime->oss.period_bytes;
info.bytes = (runtime->oss.bytes + delay) & INT_MAX;
}
}
if (copy_to_user(_info, &info, sizeof(info)))
return -EFAULT;
return 0;
}
static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info)
{
struct snd_pcm_substream *substream;
struct snd_pcm_runtime *runtime;
snd_pcm_sframes_t avail;
int fixup;
struct audio_buf_info info;
int err;
if (_info == NULL)
return -EFAULT;
substream = pcm_oss_file->streams[stream];
if (substream == NULL)
return -EINVAL;
runtime = substream->runtime;
if (runtime->oss.params &&
(err = snd_pcm_oss_change_params(substream, false)) < 0)
return err;
info.fragsize = runtime->oss.period_bytes;
info.fragstotal = runtime->periods;
if (runtime->oss.prepare) {
if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
info.bytes = runtime->oss.period_bytes * runtime->oss.periods;
info.fragments = runtime->oss.periods;
} else {
info.bytes = 0;
info.fragments = 0;
}
} else {
if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &avail);
if (err == -EPIPE || err == -ESTRPIPE || (! err && avail < 0)) {
avail = runtime->buffer_size;
err = 0;
fixup = 0;
} else {
avail = runtime->buffer_size - avail;
fixup = -runtime->oss.buffer_used;
}
} else {
err = snd_pcm_oss_capture_position_fixup(substream, &avail);
fixup = runtime->oss.buffer_used;
}
if (err < 0)
return err;
info.bytes = snd_pcm_oss_bytes(substream, avail) + fixup;
info.fragments = info.bytes / runtime->oss.period_bytes;
}
#ifdef OSS_DEBUG
pcm_dbg(substream->pcm,
"pcm_oss: space: bytes = %i, fragments = %i, fragstotal = %i, fragsize = %i\n",
info.bytes, info.fragments, info.fragstotal, info.fragsize);
#endif
if (copy_to_user(_info, &info, sizeof(info)))
return -EFAULT;
return 0;
}
static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info)
{
// it won't be probably implemented
// pr_debug("TODO: snd_pcm_oss_get_mapbuf\n");
return -EINVAL;
}
static const char *strip_task_path(const char *path)
{
const char *ptr, *ptrl = NULL;
for (ptr = path; *ptr; ptr++) {
if (*ptr == '/')
ptrl = ptr + 1;
}
return ptrl;
}
static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
const char *task_name,
struct snd_pcm_oss_setup *rsetup)
{
struct snd_pcm_oss_setup *setup;
mutex_lock(&pcm->streams[stream].oss.setup_mutex);
do {
for (setup = pcm->streams[stream].oss.setup_list; setup;
setup = setup->next) {
if (!strcmp(setup->task_name, task_name))
goto out;
}
} while ((task_name = strip_task_path(task_name)) != NULL);
out:
if (setup)
*rsetup = *setup;
mutex_unlock(&pcm->streams[stream].oss.setup_mutex);
}
static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime;
runtime = substream->runtime;
vfree(runtime->oss.buffer);
runtime->oss.buffer = NULL;
#ifdef CONFIG_SND_PCM_OSS_PLUGINS
snd_pcm_oss_plugin_clear(substream);
#endif
substream->oss.oss = 0;
}
static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
struct snd_pcm_oss_setup *setup,
int minor)
{
struct snd_pcm_runtime *runtime;
substream->oss.oss = 1;
substream->oss.setup = *setup;
if (setup->nonblock)
substream->f_flags |= O_NONBLOCK;
else if (setup->block)
substream->f_flags &= ~O_NONBLOCK;
runtime = substream->runtime;
runtime->oss.params = 1;
runtime->oss.trigger = 1;
runtime->oss.rate = 8000;
mutex_init(&runtime->oss.params_lock);
switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
case SNDRV_MINOR_OSS_PCM_8:
runtime->oss.format = AFMT_U8;
break;
case SNDRV_MINOR_OSS_PCM_16:
runtime->oss.format = AFMT_S16_LE;
break;
default:
runtime->oss.format = AFMT_MU_LAW;
}
runtime->oss.channels = 1;
runtime->oss.fragshift = 0;
runtime->oss.maxfrags = 0;
runtime->oss.subdivision = 0;
substream->pcm_release = snd_pcm_oss_release_substream;
}
static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file)
{
int cidx;
if (!pcm_oss_file)
return 0;
for (cidx = 0; cidx < 2; ++cidx) {
struct snd_pcm_substream *substream = pcm_oss_file->streams[cidx];
if (substream)
snd_pcm_release_substream(substream);
}
kfree(pcm_oss_file);
return 0;
}
static int snd_pcm_oss_open_file(struct file *file,
struct snd_pcm *pcm,
struct snd_pcm_oss_file **rpcm_oss_file,
int minor,
struct snd_pcm_oss_setup *setup)
{
int idx, err;
struct snd_pcm_oss_file *pcm_oss_file;
struct snd_pcm_substream *substream;
fmode_t f_mode = file->f_mode;
if (rpcm_oss_file)
*rpcm_oss_file = NULL;
pcm_oss_file = kzalloc(sizeof(*pcm_oss_file), GFP_KERNEL);
if (pcm_oss_file == NULL)
return -ENOMEM;
if ((f_mode & (FMODE_WRITE|FMODE_READ)) == (FMODE_WRITE|FMODE_READ) &&
(pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX))
f_mode = FMODE_WRITE;
file->f_flags &= ~O_APPEND;
for (idx = 0; idx < 2; idx++) {
if (setup[idx].disable)
continue;
if (! pcm->streams[idx].substream_count)
continue; /* no matching substream */
if (idx == SNDRV_PCM_STREAM_PLAYBACK) {
if (! (f_mode & FMODE_WRITE))
continue;
} else {
if (! (f_mode & FMODE_READ))
continue;
}
err = snd_pcm_open_substream(pcm, idx, file, &substream);
if (err < 0) {
snd_pcm_oss_release_file(pcm_oss_file);
return err;
}
pcm_oss_file->streams[idx] = substream;
substream->file = pcm_oss_file;
snd_pcm_oss_init_substream(substream, &setup[idx], minor);
}
if (!pcm_oss_file->streams[0] && !pcm_oss_file->streams[1]) {
snd_pcm_oss_release_file(pcm_oss_file);
return -EINVAL;
}
file->private_data = pcm_oss_file;
if (rpcm_oss_file)
*rpcm_oss_file = pcm_oss_file;
return 0;
}
static int snd_task_name(struct task_struct *task, char *name, size_t size)
{
unsigned int idx;
if (snd_BUG_ON(!task || !name || size < 2))
return -EINVAL;
for (idx = 0; idx < sizeof(task->comm) && idx + 1 < size; idx++)
name[idx] = task->comm[idx];
name[idx] = '\0';
return 0;
}
static int snd_pcm_oss_open(struct inode *inode, struct file *file)
{
int err;
char task_name[32];
struct snd_pcm *pcm;
struct snd_pcm_oss_file *pcm_oss_file;
struct snd_pcm_oss_setup setup[2];
int nonblock;
wait_queue_t wait;
err = nonseekable_open(inode, file);
if (err < 0)
return err;
pcm = snd_lookup_oss_minor_data(iminor(inode),
SNDRV_OSS_DEVICE_TYPE_PCM);
if (pcm == NULL) {
err = -ENODEV;
goto __error1;
}
err = snd_card_file_add(pcm->card, file);
if (err < 0)
goto __error1;
if (!try_module_get(pcm->card->module)) {
err = -EFAULT;
goto __error2;
}
if (snd_task_name(current, task_name, sizeof(task_name)) < 0) {
err = -EFAULT;
goto __error;
}
memset(setup, 0, sizeof(setup));
if (file->f_mode & FMODE_WRITE)
snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_PLAYBACK,
task_name, &setup[0]);
if (file->f_mode & FMODE_READ)
snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_CAPTURE,
task_name, &setup[1]);
nonblock = !!(file->f_flags & O_NONBLOCK);
if (!nonblock)
nonblock = nonblock_open;
init_waitqueue_entry(&wait, current);
add_wait_queue(&pcm->open_wait, &wait);
mutex_lock(&pcm->open_mutex);
while (1) {
err = snd_pcm_oss_open_file(file, pcm, &pcm_oss_file,
iminor(inode), setup);
if (err >= 0)
break;
if (err == -EAGAIN) {
if (nonblock) {
err = -EBUSY;
break;
}
} else
break;
set_current_state(TASK_INTERRUPTIBLE);
mutex_unlock(&pcm->open_mutex);
schedule();
mutex_lock(&pcm->open_mutex);
if (pcm->card->shutdown) {
err = -ENODEV;
break;
}
if (signal_pending(current)) {
err = -ERESTARTSYS;
break;
}
}
remove_wait_queue(&pcm->open_wait, &wait);
mutex_unlock(&pcm->open_mutex);
if (err < 0)
goto __error;
snd_card_unref(pcm->card);
return err;
__error:
module_put(pcm->card->module);
__error2:
snd_card_file_remove(pcm->card, file);
__error1:
if (pcm)
snd_card_unref(pcm->card);
return err;
}
static int snd_pcm_oss_release(struct inode *inode, struct file *file)
{
struct snd_pcm *pcm;
struct snd_pcm_substream *substream;
struct snd_pcm_oss_file *pcm_oss_file;
pcm_oss_file = file->private_data;
substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
if (substream == NULL)
substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
if (snd_BUG_ON(!substream))
return -ENXIO;
pcm = substream->pcm;
if (!pcm->card->shutdown)
snd_pcm_oss_sync(pcm_oss_file);
mutex_lock(&pcm->open_mutex);
snd_pcm_oss_release_file(pcm_oss_file);
mutex_unlock(&pcm->open_mutex);
wake_up(&pcm->open_wait);
module_put(pcm->card->module);
snd_card_file_remove(pcm->card, file);
return 0;
}
static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct snd_pcm_oss_file *pcm_oss_file;
int __user *p = (int __user *)arg;
int res;
pcm_oss_file = file->private_data;
if (cmd == OSS_GETVERSION)
return put_user(SNDRV_OSS_VERSION, p);
if (cmd == OSS_ALSAEMULVER)
return put_user(1, p);
#if defined(CONFIG_SND_MIXER_OSS) || (defined(MODULE) && defined(CONFIG_SND_MIXER_OSS_MODULE))
if (((cmd >> 8) & 0xff) == 'M') { /* mixer ioctl - for OSS compatibility */
struct snd_pcm_substream *substream;
int idx;
for (idx = 0; idx < 2; ++idx) {
substream = pcm_oss_file->streams[idx];
if (substream != NULL)
break;
}
if (snd_BUG_ON(idx >= 2))
return -ENXIO;
return snd_mixer_oss_ioctl_card(substream->pcm->card, cmd, arg);
}
#endif
if (((cmd >> 8) & 0xff) != 'P')
return -EINVAL;
#ifdef OSS_DEBUG
pr_debug("pcm_oss: ioctl = 0x%x\n", cmd);
#endif
switch (cmd) {
case SNDCTL_DSP_RESET:
return snd_pcm_oss_reset(pcm_oss_file);
case SNDCTL_DSP_SYNC:
return snd_pcm_oss_sync(pcm_oss_file);
case SNDCTL_DSP_SPEED:
if (get_user(res, p))
return -EFAULT;
if ((res = snd_pcm_oss_set_rate(pcm_oss_file, res))<0)
return res;
return put_user(res, p);
case SOUND_PCM_READ_RATE:
res = snd_pcm_oss_get_rate(pcm_oss_file);
if (res < 0)
return res;
return put_user(res, p);
case SNDCTL_DSP_STEREO:
if (get_user(res, p))
return -EFAULT;
res = res > 0 ? 2 : 1;
if ((res = snd_pcm_oss_set_channels(pcm_oss_file, res)) < 0)
return res;
return put_user(--res, p);
case SNDCTL_DSP_GETBLKSIZE:
res = snd_pcm_oss_get_block_size(pcm_oss_file);
if (res < 0)
return res;
return put_user(res, p);
case SNDCTL_DSP_SETFMT:
if (get_user(res, p))
return -EFAULT;
res = snd_pcm_oss_set_format(pcm_oss_file, res);
if (res < 0)
return res;
return put_user(res, p);
case SOUND_PCM_READ_BITS:
res = snd_pcm_oss_get_format(pcm_oss_file);
if (res < 0)
return res;
return put_user(res, p);
case SNDCTL_DSP_CHANNELS:
if (get_user(res, p))
return -EFAULT;
res = snd_pcm_oss_set_channels(pcm_oss_file, res);
if (res < 0)
return res;
return put_user(res, p);
case SOUND_PCM_READ_CHANNELS:
res = snd_pcm_oss_get_channels(pcm_oss_file);
if (res < 0)
return res;
return put_user(res, p);
case SOUND_PCM_WRITE_FILTER:
case SOUND_PCM_READ_FILTER:
return -EIO;
case SNDCTL_DSP_POST:
return snd_pcm_oss_post(pcm_oss_file);
case SNDCTL_DSP_SUBDIVIDE:
if (get_user(res, p))
return -EFAULT;
res = snd_pcm_oss_set_subdivide(pcm_oss_file, res);
if (res < 0)
return res;
return put_user(res, p);
case SNDCTL_DSP_SETFRAGMENT:
if (get_user(res, p))
return -EFAULT;
return snd_pcm_oss_set_fragment(pcm_oss_file, res);
case SNDCTL_DSP_GETFMTS:
res = snd_pcm_oss_get_formats(pcm_oss_file);
if (res < 0)
return res;
return put_user(res, p);
case SNDCTL_DSP_GETOSPACE:
case SNDCTL_DSP_GETISPACE:
return snd_pcm_oss_get_space(pcm_oss_file,
cmd == SNDCTL_DSP_GETISPACE ?
SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
(struct audio_buf_info __user *) arg);
case SNDCTL_DSP_NONBLOCK:
return snd_pcm_oss_nonblock(file);
case SNDCTL_DSP_GETCAPS:
res = snd_pcm_oss_get_caps(pcm_oss_file);
if (res < 0)
return res;
return put_user(res, p);
case SNDCTL_DSP_GETTRIGGER:
res = snd_pcm_oss_get_trigger(pcm_oss_file);
if (res < 0)
return res;
return put_user(res, p);
case SNDCTL_DSP_SETTRIGGER:
if (get_user(res, p))
return -EFAULT;
return snd_pcm_oss_set_trigger(pcm_oss_file, res);
case SNDCTL_DSP_GETIPTR:
case SNDCTL_DSP_GETOPTR:
return snd_pcm_oss_get_ptr(pcm_oss_file,
cmd == SNDCTL_DSP_GETIPTR ?
SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
(struct count_info __user *) arg);
case SNDCTL_DSP_MAPINBUF:
case SNDCTL_DSP_MAPOUTBUF:
return snd_pcm_oss_get_mapbuf(pcm_oss_file,
cmd == SNDCTL_DSP_MAPINBUF ?
SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
(struct buffmem_desc __user *) arg);
case SNDCTL_DSP_SETSYNCRO:
/* stop DMA now.. */
return 0;
case SNDCTL_DSP_SETDUPLEX:
if (snd_pcm_oss_get_caps(pcm_oss_file) & DSP_CAP_DUPLEX)
return 0;
return -EIO;
case SNDCTL_DSP_GETODELAY:
res = snd_pcm_oss_get_odelay(pcm_oss_file);
if (res < 0) {
/* it's for sure, some broken apps don't check for error codes */
put_user(0, p);
return res;
}
return put_user(res, p);
case SNDCTL_DSP_PROFILE:
return 0; /* silently ignore */
default:
pr_debug("pcm_oss: unknown command = 0x%x\n", cmd);
}
return -EINVAL;
}
#ifdef CONFIG_COMPAT
/* all compatible */
static long snd_pcm_oss_ioctl_compat(struct file *file, unsigned int cmd,
unsigned long arg)
{
return snd_pcm_oss_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
}
#else
#define snd_pcm_oss_ioctl_compat NULL
#endif
static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
{
struct snd_pcm_oss_file *pcm_oss_file;
struct snd_pcm_substream *substream;
pcm_oss_file = file->private_data;
substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
if (substream == NULL)
return -ENXIO;
substream->f_flags = file->f_flags & O_NONBLOCK;
#ifndef OSS_DEBUG
return snd_pcm_oss_read1(substream, buf, count);
#else
{
ssize_t res = snd_pcm_oss_read1(substream, buf, count);
pcm_dbg(substream->pcm,
"pcm_oss: read %li bytes (returned %li bytes)\n",
(long)count, (long)res);
return res;
}
#endif
}
static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
{
struct snd_pcm_oss_file *pcm_oss_file;
struct snd_pcm_substream *substream;
long result;
pcm_oss_file = file->private_data;
substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
if (substream == NULL)
return -ENXIO;
substream->f_flags = file->f_flags & O_NONBLOCK;
result = snd_pcm_oss_write1(substream, buf, count);
#ifdef OSS_DEBUG
pcm_dbg(substream->pcm, "pcm_oss: write %li bytes (wrote %li bytes)\n",
(long)count, (long)result);
#endif
return result;
}
static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
if (atomic_read(&substream->mmap_count))
return runtime->oss.prev_hw_ptr_period !=
get_hw_ptr_period(runtime);
else
return snd_pcm_playback_avail(runtime) >=
runtime->oss.period_frames;
}
static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
if (atomic_read(&substream->mmap_count))
return runtime->oss.prev_hw_ptr_period !=
get_hw_ptr_period(runtime);
else
return snd_pcm_capture_avail(runtime) >=
runtime->oss.period_frames;
}
static unsigned int snd_pcm_oss_poll(struct file *file, poll_table * wait)
{
struct snd_pcm_oss_file *pcm_oss_file;
unsigned int mask;
struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
pcm_oss_file = file->private_data;
psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
mask = 0;
if (psubstream != NULL) {
struct snd_pcm_runtime *runtime = psubstream->runtime;
poll_wait(file, &runtime->sleep, wait);
snd_pcm_stream_lock_irq(psubstream);
if (runtime->status->state != SNDRV_PCM_STATE_DRAINING &&
(runtime->status->state != SNDRV_PCM_STATE_RUNNING ||
snd_pcm_oss_playback_ready(psubstream)))
mask |= POLLOUT | POLLWRNORM;
snd_pcm_stream_unlock_irq(psubstream);
}
if (csubstream != NULL) {
struct snd_pcm_runtime *runtime = csubstream->runtime;
snd_pcm_state_t ostate;
poll_wait(file, &runtime->sleep, wait);
snd_pcm_stream_lock_irq(csubstream);
if ((ostate = runtime->status->state) != SNDRV_PCM_STATE_RUNNING ||
snd_pcm_oss_capture_ready(csubstream))
mask |= POLLIN | POLLRDNORM;
snd_pcm_stream_unlock_irq(csubstream);
if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) {
struct snd_pcm_oss_file ofile;
memset(&ofile, 0, sizeof(ofile));
ofile.streams[SNDRV_PCM_STREAM_CAPTURE] = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
runtime->oss.trigger = 0;
snd_pcm_oss_set_trigger(&ofile, PCM_ENABLE_INPUT);
}
}
return mask;
}
static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area)
{
struct snd_pcm_oss_file *pcm_oss_file;
struct snd_pcm_substream *substream = NULL;
struct snd_pcm_runtime *runtime;
int err;
#ifdef OSS_DEBUG
pr_debug("pcm_oss: mmap begin\n");
#endif
pcm_oss_file = file->private_data;
switch ((area->vm_flags & (VM_READ | VM_WRITE))) {
case VM_READ | VM_WRITE:
substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
if (substream)
break;
/* Fall through */
case VM_READ:
substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
break;
case VM_WRITE:
substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
break;
default:
return -EINVAL;
}
/* set VM_READ access as well to fix memset() routines that do
reads before writes (to improve performance) */
area->vm_flags |= VM_READ;
if (substream == NULL)
return -ENXIO;
runtime = substream->runtime;
if (!(runtime->info & SNDRV_PCM_INFO_MMAP_VALID))
return -EIO;
if (runtime->info & SNDRV_PCM_INFO_INTERLEAVED)
runtime->access = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
else
return -EIO;
if (runtime->oss.params) {
/* use mutex_trylock() for params_lock for avoiding a deadlock
* between mmap_sem and params_lock taken by
* copy_from/to_user() in snd_pcm_oss_write/read()
*/
err = snd_pcm_oss_change_params(substream, true);
if (err < 0)
return err;
}
#ifdef CONFIG_SND_PCM_OSS_PLUGINS
if (runtime->oss.plugin_first != NULL)
return -EIO;
#endif
if (area->vm_pgoff != 0)
return -EINVAL;
err = snd_pcm_mmap_data(substream, file, area);
if (err < 0)
return err;
runtime->oss.mmap_bytes = area->vm_end - area->vm_start;
runtime->silence_threshold = 0;
runtime->silence_size = 0;
#ifdef OSS_DEBUG
pr_debug("pcm_oss: mmap ok, bytes = 0x%x\n",
runtime->oss.mmap_bytes);
#endif
/* In mmap mode we never stop */
runtime->stop_threshold = runtime->boundary;
return 0;
}
#ifdef CONFIG_SND_VERBOSE_PROCFS
/*
* /proc interface
*/
static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
struct snd_info_buffer *buffer)
{
struct snd_pcm_str *pstr = entry->private_data;
struct snd_pcm_oss_setup *setup = pstr->oss.setup_list;
mutex_lock(&pstr->oss.setup_mutex);
while (setup) {
snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s\n",
setup->task_name,
setup->periods,
setup->period_size,
setup->disable ? " disable" : "",
setup->direct ? " direct" : "",
setup->block ? " block" : "",
setup->nonblock ? " non-block" : "",
setup->partialfrag ? " partial-frag" : "",
setup->nosilence ? " no-silence" : "");
setup = setup->next;
}
mutex_unlock(&pstr->oss.setup_mutex);
}
static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)
{
struct snd_pcm_oss_setup *setup, *setupn;
for (setup = pstr->oss.setup_list, pstr->oss.setup_list = NULL;
setup; setup = setupn) {
setupn = setup->next;
kfree(setup->task_name);
kfree(setup);
}
pstr->oss.setup_list = NULL;
}
static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
struct snd_info_buffer *buffer)
{
struct snd_pcm_str *pstr = entry->private_data;
char line[128], str[32], task_name[32];
const char *ptr;
int idx1;
struct snd_pcm_oss_setup *setup, *setup1, template;
while (!snd_info_get_line(buffer, line, sizeof(line))) {
mutex_lock(&pstr->oss.setup_mutex);
memset(&template, 0, sizeof(template));
ptr = snd_info_get_str(task_name, line, sizeof(task_name));
if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) {
snd_pcm_oss_proc_free_setup_list(pstr);
mutex_unlock(&pstr->oss.setup_mutex);
continue;
}
for (setup = pstr->oss.setup_list; setup; setup = setup->next) {
if (!strcmp(setup->task_name, task_name)) {
template = *setup;
break;
}
}
ptr = snd_info_get_str(str, ptr, sizeof(str));
template.periods = simple_strtoul(str, NULL, 10);
ptr = snd_info_get_str(str, ptr, sizeof(str));
template.period_size = simple_strtoul(str, NULL, 10);
for (idx1 = 31; idx1 >= 0; idx1--)
if (template.period_size & (1 << idx1))
break;
for (idx1--; idx1 >= 0; idx1--)
template.period_size &= ~(1 << idx1);
do {
ptr = snd_info_get_str(str, ptr, sizeof(str));
if (!strcmp(str, "disable")) {
template.disable = 1;
} else if (!strcmp(str, "direct")) {
template.direct = 1;
} else if (!strcmp(str, "block")) {
template.block = 1;
} else if (!strcmp(str, "non-block")) {
template.nonblock = 1;
} else if (!strcmp(str, "partial-frag")) {
template.partialfrag = 1;
} else if (!strcmp(str, "no-silence")) {
template.nosilence = 1;
} else if (!strcmp(str, "buggy-ptr")) {
template.buggyptr = 1;
}
} while (*str);
if (setup == NULL) {
setup = kmalloc(sizeof(*setup), GFP_KERNEL);
if (! setup) {
buffer->error = -ENOMEM;
mutex_unlock(&pstr->oss.setup_mutex);
return;
}
if (pstr->oss.setup_list == NULL)
pstr->oss.setup_list = setup;
else {
for (setup1 = pstr->oss.setup_list;
setup1->next; setup1 = setup1->next);
setup1->next = setup;
}
template.task_name = kstrdup(task_name, GFP_KERNEL);
if (! template.task_name) {
kfree(setup);
buffer->error = -ENOMEM;
mutex_unlock(&pstr->oss.setup_mutex);
return;
}
}
*setup = template;
mutex_unlock(&pstr->oss.setup_mutex);
}
}
static void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
{
int stream;
for (stream = 0; stream < 2; ++stream) {
struct snd_info_entry *entry;
struct snd_pcm_str *pstr = &pcm->streams[stream];
if (pstr->substream_count == 0)
continue;
if ((entry = snd_info_create_card_entry(pcm->card, "oss", pstr->proc_root)) != NULL) {
entry->content = SNDRV_INFO_CONTENT_TEXT;
entry->mode = S_IFREG | S_IRUGO | S_IWUSR;
entry->c.text.read = snd_pcm_oss_proc_read;
entry->c.text.write = snd_pcm_oss_proc_write;
entry->private_data = pstr;
if (snd_info_register(entry) < 0) {
snd_info_free_entry(entry);
entry = NULL;
}
}
pstr->oss.proc_entry = entry;
}
}
static void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
{
int stream;
for (stream = 0; stream < 2; ++stream) {
struct snd_pcm_str *pstr = &pcm->streams[stream];
snd_info_free_entry(pstr->oss.proc_entry);
pstr->oss.proc_entry = NULL;
snd_pcm_oss_proc_free_setup_list(pstr);
}
}
#else /* !CONFIG_SND_VERBOSE_PROCFS */
#define snd_pcm_oss_proc_init(pcm)
#define snd_pcm_oss_proc_done(pcm)
#endif /* CONFIG_SND_VERBOSE_PROCFS */
/*
* ENTRY functions
*/
static const struct file_operations snd_pcm_oss_f_reg =
{
.owner = THIS_MODULE,
.read = snd_pcm_oss_read,
.write = snd_pcm_oss_write,
.open = snd_pcm_oss_open,
.release = snd_pcm_oss_release,
.llseek = no_llseek,
.poll = snd_pcm_oss_poll,
.unlocked_ioctl = snd_pcm_oss_ioctl,
.compat_ioctl = snd_pcm_oss_ioctl_compat,
.mmap = snd_pcm_oss_mmap,
};
static void register_oss_dsp(struct snd_pcm *pcm, int index)
{
if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
pcm->card, index, &snd_pcm_oss_f_reg,
pcm) < 0) {
pcm_err(pcm, "unable to register OSS PCM device %i:%i\n",
pcm->card->number, pcm->device);
}
}
static int snd_pcm_oss_register_minor(struct snd_pcm *pcm)
{
pcm->oss.reg = 0;
if (dsp_map[pcm->card->number] == (int)pcm->device) {
char name[128];
int duplex;
register_oss_dsp(pcm, 0);
duplex = (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count > 0 &&
pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count &&
!(pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX));
sprintf(name, "%s%s", pcm->name, duplex ? " (DUPLEX)" : "");
#ifdef SNDRV_OSS_INFO_DEV_AUDIO
snd_oss_info_register(SNDRV_OSS_INFO_DEV_AUDIO,
pcm->card->number,
name);
#endif
pcm->oss.reg++;
pcm->oss.reg_mask |= 1;
}
if (adsp_map[pcm->card->number] == (int)pcm->device) {
register_oss_dsp(pcm, 1);
pcm->oss.reg++;
pcm->oss.reg_mask |= 2;
}
if (pcm->oss.reg)
snd_pcm_oss_proc_init(pcm);
return 0;
}
static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm)
{
if (pcm->oss.reg) {
if (pcm->oss.reg_mask & 1) {
pcm->oss.reg_mask &= ~1;
snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
pcm->card, 0);
}
if (pcm->oss.reg_mask & 2) {
pcm->oss.reg_mask &= ~2;
snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
pcm->card, 1);
}
if (dsp_map[pcm->card->number] == (int)pcm->device) {
#ifdef SNDRV_OSS_INFO_DEV_AUDIO
snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number);
#endif
}
pcm->oss.reg = 0;
}
return 0;
}
static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm)
{
snd_pcm_oss_disconnect_minor(pcm);
snd_pcm_oss_proc_done(pcm);
return 0;
}
static struct snd_pcm_notify snd_pcm_oss_notify =
{
.n_register = snd_pcm_oss_register_minor,
.n_disconnect = snd_pcm_oss_disconnect_minor,
.n_unregister = snd_pcm_oss_unregister_minor,
};
static int __init alsa_pcm_oss_init(void)
{
int i;
int err;
/* check device map table */
for (i = 0; i < SNDRV_CARDS; i++) {
if (dsp_map[i] < 0 || dsp_map[i] >= SNDRV_PCM_DEVICES) {
pr_err("ALSA: pcm_oss: invalid dsp_map[%d] = %d\n",
i, dsp_map[i]);
dsp_map[i] = 0;
}
if (adsp_map[i] < 0 || adsp_map[i] >= SNDRV_PCM_DEVICES) {
pr_err("ALSA: pcm_oss: invalid adsp_map[%d] = %d\n",
i, adsp_map[i]);
adsp_map[i] = 1;
}
}
if ((err = snd_pcm_notify(&snd_pcm_oss_notify, 0)) < 0)
return err;
return 0;
}
static void __exit alsa_pcm_oss_exit(void)
{
snd_pcm_notify(&snd_pcm_oss_notify, 1);
}
module_init(alsa_pcm_oss_init)
module_exit(alsa_pcm_oss_exit)
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