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linux/sound/soc/soc-core.c
Takashi Iwai 4efda5f213 ASoC: Fix use-after-free at card unregistration 
soc_cleanup_card_resources() call snd_card_free() at the last of its
procedure.  This turned out to lead to a use-after-free.
PCM runtimes have been already removed via soc_remove_pcm_runtimes(),
while it's dereferenced later in soc_pcm_free() called via
snd_card_free().

The fix is simple: just move the snd_card_free() call to the beginning
of the whole procedure.  This also gives another benefit: it
guarantees that all operations have been shut down before actually
releasing the resources, which was racy until now.

Reported-and-tested-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: <stable@vger.kernel.org>
2017-05-24 18:11:08 +01:00

4215 lines
106 KiB
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/*
* soc-core.c -- ALSA SoC Audio Layer
*
* Copyright 2005 Wolfson Microelectronics PLC.
* Copyright 2005 Openedhand Ltd.
* Copyright (C) 2010 Slimlogic Ltd.
* Copyright (C) 2010 Texas Instruments Inc.
*
* Author: Liam Girdwood <lrg@slimlogic.co.uk>
* with code, comments and ideas from :-
* Richard Purdie <richard@openedhand.com>
*
* 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.
*
* TODO:
* o Add hw rules to enforce rates, etc.
* o More testing with other codecs/machines.
* o Add more codecs and platforms to ensure good API coverage.
* o Support TDM on PCM and I2S
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/bitops.h>
#include <linux/debugfs.h>
#include <linux/platform_device.h>
#include <linux/pinctrl/consumer.h>
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/dmi.h>
#include <sound/core.h>
#include <sound/jack.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dpcm.h>
#include <sound/soc-topology.h>
#include <sound/initval.h>
#define CREATE_TRACE_POINTS
#include <trace/events/asoc.h>
#define NAME_SIZE 32
#ifdef CONFIG_DEBUG_FS
struct dentry *snd_soc_debugfs_root;
EXPORT_SYMBOL_GPL(snd_soc_debugfs_root);
#endif
static DEFINE_MUTEX(client_mutex);
static LIST_HEAD(platform_list);
static LIST_HEAD(codec_list);
static LIST_HEAD(component_list);
/*
* This is a timeout to do a DAPM powerdown after a stream is closed().
* It can be used to eliminate pops between different playback streams, e.g.
* between two audio tracks.
*/
static int pmdown_time = 5000;
module_param(pmdown_time, int, 0);
MODULE_PARM_DESC(pmdown_time, "DAPM stream powerdown time (msecs)");
/* returns the minimum number of bytes needed to represent
* a particular given value */
static int min_bytes_needed(unsigned long val)
{
int c = 0;
int i;
for (i = (sizeof val * 8) - 1; i >= 0; --i, ++c)
if (val & (1UL << i))
break;
c = (sizeof val * 8) - c;
if (!c || (c % 8))
c = (c + 8) / 8;
else
c /= 8;
return c;
}
/* fill buf which is 'len' bytes with a formatted
* string of the form 'reg: value\n' */
static int format_register_str(struct snd_soc_codec *codec,
unsigned int reg, char *buf, size_t len)
{
int wordsize = min_bytes_needed(codec->driver->reg_cache_size) * 2;
int regsize = codec->driver->reg_word_size * 2;
int ret;
/* +2 for ': ' and + 1 for '\n' */
if (wordsize + regsize + 2 + 1 != len)
return -EINVAL;
sprintf(buf, "%.*x: ", wordsize, reg);
buf += wordsize + 2;
ret = snd_soc_read(codec, reg);
if (ret < 0)
memset(buf, 'X', regsize);
else
sprintf(buf, "%.*x", regsize, ret);
buf[regsize] = '\n';
/* no NUL-termination needed */
return 0;
}
/* codec register dump */
static ssize_t soc_codec_reg_show(struct snd_soc_codec *codec, char *buf,
size_t count, loff_t pos)
{
int i, step = 1;
int wordsize, regsize;
int len;
size_t total = 0;
loff_t p = 0;
wordsize = min_bytes_needed(codec->driver->reg_cache_size) * 2;
regsize = codec->driver->reg_word_size * 2;
len = wordsize + regsize + 2 + 1;
if (!codec->driver->reg_cache_size)
return 0;
if (codec->driver->reg_cache_step)
step = codec->driver->reg_cache_step;
for (i = 0; i < codec->driver->reg_cache_size; i += step) {
/* only support larger than PAGE_SIZE bytes debugfs
* entries for the default case */
if (p >= pos) {
if (total + len >= count - 1)
break;
format_register_str(codec, i, buf + total, len);
total += len;
}
p += len;
}
total = min(total, count - 1);
return total;
}
static ssize_t codec_reg_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct snd_soc_pcm_runtime *rtd = dev_get_drvdata(dev);
return soc_codec_reg_show(rtd->codec, buf, PAGE_SIZE, 0);
}
static DEVICE_ATTR(codec_reg, 0444, codec_reg_show, NULL);
static ssize_t pmdown_time_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct snd_soc_pcm_runtime *rtd = dev_get_drvdata(dev);
return sprintf(buf, "%ld\n", rtd->pmdown_time);
}
static ssize_t pmdown_time_set(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct snd_soc_pcm_runtime *rtd = dev_get_drvdata(dev);
int ret;
ret = kstrtol(buf, 10, &rtd->pmdown_time);
if (ret)
return ret;
return count;
}
static DEVICE_ATTR(pmdown_time, 0644, pmdown_time_show, pmdown_time_set);
static struct attribute *soc_dev_attrs[] = {
&dev_attr_codec_reg.attr,
&dev_attr_pmdown_time.attr,
NULL
};
static umode_t soc_dev_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int idx)
{
struct device *dev = kobj_to_dev(kobj);
struct snd_soc_pcm_runtime *rtd = dev_get_drvdata(dev);
if (attr == &dev_attr_pmdown_time.attr)
return attr->mode; /* always visible */
return rtd->codec ? attr->mode : 0; /* enabled only with codec */
}
static const struct attribute_group soc_dapm_dev_group = {
.attrs = soc_dapm_dev_attrs,
.is_visible = soc_dev_attr_is_visible,
};
static const struct attribute_group soc_dev_roup = {
.attrs = soc_dev_attrs,
.is_visible = soc_dev_attr_is_visible,
};
static const struct attribute_group *soc_dev_attr_groups[] = {
&soc_dapm_dev_group,
&soc_dev_roup,
NULL
};
#ifdef CONFIG_DEBUG_FS
static ssize_t codec_reg_read_file(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
ssize_t ret;
struct snd_soc_codec *codec = file->private_data;
char *buf;
if (*ppos < 0 || !count)
return -EINVAL;
buf = kmalloc(count, GFP_KERNEL);
if (!buf)
return -ENOMEM;
ret = soc_codec_reg_show(codec, buf, count, *ppos);
if (ret >= 0) {
if (copy_to_user(user_buf, buf, ret)) {
kfree(buf);
return -EFAULT;
}
*ppos += ret;
}
kfree(buf);
return ret;
}
static ssize_t codec_reg_write_file(struct file *file,
const char __user *user_buf, size_t count, loff_t *ppos)
{
char buf[32];
size_t buf_size;
char *start = buf;
unsigned long reg, value;
struct snd_soc_codec *codec = file->private_data;
int ret;
buf_size = min(count, (sizeof(buf)-1));
if (copy_from_user(buf, user_buf, buf_size))
return -EFAULT;
buf[buf_size] = 0;
while (*start == ' ')
start++;
reg = simple_strtoul(start, &start, 16);
while (*start == ' ')
start++;
ret = kstrtoul(start, 16, &value);
if (ret)
return ret;
/* Userspace has been fiddling around behind the kernel's back */
add_taint(TAINT_USER, LOCKDEP_NOW_UNRELIABLE);
snd_soc_write(codec, reg, value);
return buf_size;
}
static const struct file_operations codec_reg_fops = {
.open = simple_open,
.read = codec_reg_read_file,
.write = codec_reg_write_file,
.llseek = default_llseek,
};
static void soc_init_component_debugfs(struct snd_soc_component *component)
{
if (!component->card->debugfs_card_root)
return;
if (component->debugfs_prefix) {
char *name;
name = kasprintf(GFP_KERNEL, "%s:%s",
component->debugfs_prefix, component->name);
if (name) {
component->debugfs_root = debugfs_create_dir(name,
component->card->debugfs_card_root);
kfree(name);
}
} else {
component->debugfs_root = debugfs_create_dir(component->name,
component->card->debugfs_card_root);
}
if (!component->debugfs_root) {
dev_warn(component->dev,
"ASoC: Failed to create component debugfs directory\n");
return;
}
snd_soc_dapm_debugfs_init(snd_soc_component_get_dapm(component),
component->debugfs_root);
if (component->init_debugfs)
component->init_debugfs(component);
}
static void soc_cleanup_component_debugfs(struct snd_soc_component *component)
{
debugfs_remove_recursive(component->debugfs_root);
}
static void soc_init_codec_debugfs(struct snd_soc_component *component)
{
struct snd_soc_codec *codec = snd_soc_component_to_codec(component);
codec->debugfs_reg = debugfs_create_file("codec_reg", 0644,
codec->component.debugfs_root,
codec, &codec_reg_fops);
if (!codec->debugfs_reg)
dev_warn(codec->dev,
"ASoC: Failed to create codec register debugfs file\n");
}
static ssize_t codec_list_read_file(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
ssize_t len, ret = 0;
struct snd_soc_codec *codec;
if (!buf)
return -ENOMEM;
mutex_lock(&client_mutex);
list_for_each_entry(codec, &codec_list, list) {
len = snprintf(buf + ret, PAGE_SIZE - ret, "%s\n",
codec->component.name);
if (len >= 0)
ret += len;
if (ret > PAGE_SIZE) {
ret = PAGE_SIZE;
break;
}
}
mutex_unlock(&client_mutex);
if (ret >= 0)
ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
kfree(buf);
return ret;
}
static const struct file_operations codec_list_fops = {
.read = codec_list_read_file,
.llseek = default_llseek,/* read accesses f_pos */
};
static ssize_t dai_list_read_file(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
ssize_t len, ret = 0;
struct snd_soc_component *component;
struct snd_soc_dai *dai;
if (!buf)
return -ENOMEM;
mutex_lock(&client_mutex);
list_for_each_entry(component, &component_list, list) {
list_for_each_entry(dai, &component->dai_list, list) {
len = snprintf(buf + ret, PAGE_SIZE - ret, "%s\n",
dai->name);
if (len >= 0)
ret += len;
if (ret > PAGE_SIZE) {
ret = PAGE_SIZE;
break;
}
}
}
mutex_unlock(&client_mutex);
ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
kfree(buf);
return ret;
}
static const struct file_operations dai_list_fops = {
.read = dai_list_read_file,
.llseek = default_llseek,/* read accesses f_pos */
};
static ssize_t platform_list_read_file(struct file *file,
char __user *user_buf,
size_t count, loff_t *ppos)
{
char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
ssize_t len, ret = 0;
struct snd_soc_platform *platform;
if (!buf)
return -ENOMEM;
mutex_lock(&client_mutex);
list_for_each_entry(platform, &platform_list, list) {
len = snprintf(buf + ret, PAGE_SIZE - ret, "%s\n",
platform->component.name);
if (len >= 0)
ret += len;
if (ret > PAGE_SIZE) {
ret = PAGE_SIZE;
break;
}
}
mutex_unlock(&client_mutex);
ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
kfree(buf);
return ret;
}
static const struct file_operations platform_list_fops = {
.read = platform_list_read_file,
.llseek = default_llseek,/* read accesses f_pos */
};
static void soc_init_card_debugfs(struct snd_soc_card *card)
{
if (!snd_soc_debugfs_root)
return;
card->debugfs_card_root = debugfs_create_dir(card->name,
snd_soc_debugfs_root);
if (!card->debugfs_card_root) {
dev_warn(card->dev,
"ASoC: Failed to create card debugfs directory\n");
return;
}
card->debugfs_pop_time = debugfs_create_u32("dapm_pop_time", 0644,
card->debugfs_card_root,
&card->pop_time);
if (!card->debugfs_pop_time)
dev_warn(card->dev,
"ASoC: Failed to create pop time debugfs file\n");
}
static void soc_cleanup_card_debugfs(struct snd_soc_card *card)
{
debugfs_remove_recursive(card->debugfs_card_root);
}
static void snd_soc_debugfs_init(void)
{
snd_soc_debugfs_root = debugfs_create_dir("asoc", NULL);
if (IS_ERR(snd_soc_debugfs_root) || !snd_soc_debugfs_root) {
pr_warn("ASoC: Failed to create debugfs directory\n");
snd_soc_debugfs_root = NULL;
return;
}
if (!debugfs_create_file("codecs", 0444, snd_soc_debugfs_root, NULL,
&codec_list_fops))
pr_warn("ASoC: Failed to create CODEC list debugfs file\n");
if (!debugfs_create_file("dais", 0444, snd_soc_debugfs_root, NULL,
&dai_list_fops))
pr_warn("ASoC: Failed to create DAI list debugfs file\n");
if (!debugfs_create_file("platforms", 0444, snd_soc_debugfs_root, NULL,
&platform_list_fops))
pr_warn("ASoC: Failed to create platform list debugfs file\n");
}
static void snd_soc_debugfs_exit(void)
{
debugfs_remove_recursive(snd_soc_debugfs_root);
}
#else
#define soc_init_codec_debugfs NULL
static inline void soc_init_component_debugfs(
struct snd_soc_component *component)
{
}
static inline void soc_cleanup_component_debugfs(
struct snd_soc_component *component)
{
}
static inline void soc_init_card_debugfs(struct snd_soc_card *card)
{
}
static inline void soc_cleanup_card_debugfs(struct snd_soc_card *card)
{
}
static inline void snd_soc_debugfs_init(void)
{
}
static inline void snd_soc_debugfs_exit(void)
{
}
#endif
struct snd_pcm_substream *snd_soc_get_dai_substream(struct snd_soc_card *card,
const char *dai_link, int stream)
{
struct snd_soc_pcm_runtime *rtd;
list_for_each_entry(rtd, &card->rtd_list, list) {
if (rtd->dai_link->no_pcm &&
!strcmp(rtd->dai_link->name, dai_link))
return rtd->pcm->streams[stream].substream;
}
dev_dbg(card->dev, "ASoC: failed to find dai link %s\n", dai_link);
return NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_get_dai_substream);
static struct snd_soc_pcm_runtime *soc_new_pcm_runtime(
struct snd_soc_card *card, struct snd_soc_dai_link *dai_link)
{
struct snd_soc_pcm_runtime *rtd;
rtd = kzalloc(sizeof(struct snd_soc_pcm_runtime), GFP_KERNEL);
if (!rtd)
return NULL;
rtd->card = card;
rtd->dai_link = dai_link;
rtd->codec_dais = kzalloc(sizeof(struct snd_soc_dai *) *
dai_link->num_codecs,
GFP_KERNEL);
if (!rtd->codec_dais) {
kfree(rtd);
return NULL;
}
return rtd;
}
static void soc_free_pcm_runtime(struct snd_soc_pcm_runtime *rtd)
{
if (rtd && rtd->codec_dais)
kfree(rtd->codec_dais);
kfree(rtd);
}
static void soc_add_pcm_runtime(struct snd_soc_card *card,
struct snd_soc_pcm_runtime *rtd)
{
list_add_tail(&rtd->list, &card->rtd_list);
rtd->num = card->num_rtd;
card->num_rtd++;
}
static void soc_remove_pcm_runtimes(struct snd_soc_card *card)
{
struct snd_soc_pcm_runtime *rtd, *_rtd;
list_for_each_entry_safe(rtd, _rtd, &card->rtd_list, list) {
list_del(&rtd->list);
soc_free_pcm_runtime(rtd);
}
card->num_rtd = 0;
}
struct snd_soc_pcm_runtime *snd_soc_get_pcm_runtime(struct snd_soc_card *card,
const char *dai_link)
{
struct snd_soc_pcm_runtime *rtd;
list_for_each_entry(rtd, &card->rtd_list, list) {
if (!strcmp(rtd->dai_link->name, dai_link))
return rtd;
}
dev_dbg(card->dev, "ASoC: failed to find rtd %s\n", dai_link);
return NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_get_pcm_runtime);
static void codec2codec_close_delayed_work(struct work_struct *work)
{
/* Currently nothing to do for c2c links
* Since c2c links are internal nodes in the DAPM graph and
* don't interface with the outside world or application layer
* we don't have to do any special handling on close.
*/
}
#ifdef CONFIG_PM_SLEEP
/* powers down audio subsystem for suspend */
int snd_soc_suspend(struct device *dev)
{
struct snd_soc_card *card = dev_get_drvdata(dev);
struct snd_soc_component *component;
struct snd_soc_pcm_runtime *rtd;
int i;
/* If the card is not initialized yet there is nothing to do */
if (!card->instantiated)
return 0;
/* Due to the resume being scheduled into a workqueue we could
* suspend before that's finished - wait for it to complete.
*/
snd_power_lock(card->snd_card);
snd_power_wait(card->snd_card, SNDRV_CTL_POWER_D0);
snd_power_unlock(card->snd_card);
/* we're going to block userspace touching us until resume completes */
snd_power_change_state(card->snd_card, SNDRV_CTL_POWER_D3hot);
/* mute any active DACs */
list_for_each_entry(rtd, &card->rtd_list, list) {
if (rtd->dai_link->ignore_suspend)
continue;
for (i = 0; i < rtd->num_codecs; i++) {
struct snd_soc_dai *dai = rtd->codec_dais[i];
struct snd_soc_dai_driver *drv = dai->driver;
if (drv->ops->digital_mute && dai->playback_active)
drv->ops->digital_mute(dai, 1);
}
}
/* suspend all pcms */
list_for_each_entry(rtd, &card->rtd_list, list) {
if (rtd->dai_link->ignore_suspend)
continue;
snd_pcm_suspend_all(rtd->pcm);
}
if (card->suspend_pre)
card->suspend_pre(card);
list_for_each_entry(rtd, &card->rtd_list, list) {
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
if (rtd->dai_link->ignore_suspend)
continue;
if (cpu_dai->driver->suspend && !cpu_dai->driver->bus_control)
cpu_dai->driver->suspend(cpu_dai);
}
/* close any waiting streams */
list_for_each_entry(rtd, &card->rtd_list, list)
flush_delayed_work(&rtd->delayed_work);
list_for_each_entry(rtd, &card->rtd_list, list) {
if (rtd->dai_link->ignore_suspend)
continue;
snd_soc_dapm_stream_event(rtd,
SNDRV_PCM_STREAM_PLAYBACK,
SND_SOC_DAPM_STREAM_SUSPEND);
snd_soc_dapm_stream_event(rtd,
SNDRV_PCM_STREAM_CAPTURE,
SND_SOC_DAPM_STREAM_SUSPEND);
}
/* Recheck all endpoints too, their state is affected by suspend */
dapm_mark_endpoints_dirty(card);
snd_soc_dapm_sync(&card->dapm);
/* suspend all COMPONENTs */
list_for_each_entry(component, &card->component_dev_list, card_list) {
struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(component);
/* If there are paths active then the COMPONENT will be held with
* bias _ON and should not be suspended. */
if (!component->suspended) {
switch (snd_soc_dapm_get_bias_level(dapm)) {
case SND_SOC_BIAS_STANDBY:
/*
* If the COMPONENT is capable of idle
* bias off then being in STANDBY
* means it's doing something,
* otherwise fall through.
*/
if (dapm->idle_bias_off) {
dev_dbg(component->dev,
"ASoC: idle_bias_off CODEC on over suspend\n");
break;
}
case SND_SOC_BIAS_OFF:
if (component->suspend)
component->suspend(component);
component->suspended = 1;
if (component->regmap)
regcache_mark_dirty(component->regmap);
/* deactivate pins to sleep state */
pinctrl_pm_select_sleep_state(component->dev);
break;
default:
dev_dbg(component->dev,
"ASoC: COMPONENT is on over suspend\n");
break;
}
}
}
list_for_each_entry(rtd, &card->rtd_list, list) {
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
if (rtd->dai_link->ignore_suspend)
continue;
if (cpu_dai->driver->suspend && cpu_dai->driver->bus_control)
cpu_dai->driver->suspend(cpu_dai);
/* deactivate pins to sleep state */
pinctrl_pm_select_sleep_state(cpu_dai->dev);
}
if (card->suspend_post)
card->suspend_post(card);
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_suspend);
/* deferred resume work, so resume can complete before we finished
* setting our codec back up, which can be very slow on I2C
*/
static void soc_resume_deferred(struct work_struct *work)
{
struct snd_soc_card *card =
container_of(work, struct snd_soc_card, deferred_resume_work);
struct snd_soc_pcm_runtime *rtd;
struct snd_soc_component *component;
int i;
/* our power state is still SNDRV_CTL_POWER_D3hot from suspend time,
* so userspace apps are blocked from touching us
*/
dev_dbg(card->dev, "ASoC: starting resume work\n");
/* Bring us up into D2 so that DAPM starts enabling things */
snd_power_change_state(card->snd_card, SNDRV_CTL_POWER_D2);
if (card->resume_pre)
card->resume_pre(card);
/* resume control bus DAIs */
list_for_each_entry(rtd, &card->rtd_list, list) {
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
if (rtd->dai_link->ignore_suspend)
continue;
if (cpu_dai->driver->resume && cpu_dai->driver->bus_control)
cpu_dai->driver->resume(cpu_dai);
}
list_for_each_entry(component, &card->component_dev_list, card_list) {
if (component->suspended) {
if (component->resume)
component->resume(component);
component->suspended = 0;
}
}
list_for_each_entry(rtd, &card->rtd_list, list) {
if (rtd->dai_link->ignore_suspend)
continue;
snd_soc_dapm_stream_event(rtd,
SNDRV_PCM_STREAM_PLAYBACK,
SND_SOC_DAPM_STREAM_RESUME);
snd_soc_dapm_stream_event(rtd,
SNDRV_PCM_STREAM_CAPTURE,
SND_SOC_DAPM_STREAM_RESUME);
}
/* unmute any active DACs */
list_for_each_entry(rtd, &card->rtd_list, list) {
if (rtd->dai_link->ignore_suspend)
continue;
for (i = 0; i < rtd->num_codecs; i++) {
struct snd_soc_dai *dai = rtd->codec_dais[i];
struct snd_soc_dai_driver *drv = dai->driver;
if (drv->ops->digital_mute && dai->playback_active)
drv->ops->digital_mute(dai, 0);
}
}
list_for_each_entry(rtd, &card->rtd_list, list) {
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
if (rtd->dai_link->ignore_suspend)
continue;
if (cpu_dai->driver->resume && !cpu_dai->driver->bus_control)
cpu_dai->driver->resume(cpu_dai);
}
if (card->resume_post)
card->resume_post(card);
dev_dbg(card->dev, "ASoC: resume work completed\n");
/* Recheck all endpoints too, their state is affected by suspend */
dapm_mark_endpoints_dirty(card);
snd_soc_dapm_sync(&card->dapm);
/* userspace can access us now we are back as we were before */
snd_power_change_state(card->snd_card, SNDRV_CTL_POWER_D0);
}
/* powers up audio subsystem after a suspend */
int snd_soc_resume(struct device *dev)
{
struct snd_soc_card *card = dev_get_drvdata(dev);
bool bus_control = false;
struct snd_soc_pcm_runtime *rtd;
/* If the card is not initialized yet there is nothing to do */
if (!card->instantiated)
return 0;
/* activate pins from sleep state */
list_for_each_entry(rtd, &card->rtd_list, list) {
struct snd_soc_dai **codec_dais = rtd->codec_dais;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
int j;
if (cpu_dai->active)
pinctrl_pm_select_default_state(cpu_dai->dev);
for (j = 0; j < rtd->num_codecs; j++) {
struct snd_soc_dai *codec_dai = codec_dais[j];
if (codec_dai->active)
pinctrl_pm_select_default_state(codec_dai->dev);
}
}
/*
* DAIs that also act as the control bus master might have other drivers
* hanging off them so need to resume immediately. Other drivers don't
* have that problem and may take a substantial amount of time to resume
* due to I/O costs and anti-pop so handle them out of line.
*/
list_for_each_entry(rtd, &card->rtd_list, list) {
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
bus_control |= cpu_dai->driver->bus_control;
}
if (bus_control) {
dev_dbg(dev, "ASoC: Resuming control bus master immediately\n");
soc_resume_deferred(&card->deferred_resume_work);
} else {
dev_dbg(dev, "ASoC: Scheduling resume work\n");
if (!schedule_work(&card->deferred_resume_work))
dev_err(dev, "ASoC: resume work item may be lost\n");
}
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_resume);
#else
#define snd_soc_suspend NULL
#define snd_soc_resume NULL
#endif
static const struct snd_soc_dai_ops null_dai_ops = {
};
static struct snd_soc_component *soc_find_component(
const struct device_node *of_node, const char *name)
{
struct snd_soc_component *component;
lockdep_assert_held(&client_mutex);
list_for_each_entry(component, &component_list, list) {
if (of_node) {
if (component->dev->of_node == of_node)
return component;
} else if (strcmp(component->name, name) == 0) {
return component;
}
}
return NULL;
}
/**
* snd_soc_find_dai - Find a registered DAI
*
* @dlc: name of the DAI and optional component info to match
*
* This function will search all registered components and their DAIs to
* find the DAI of the same name. The component's of_node and name
* should also match if being specified.
*
* Return: pointer of DAI, or NULL if not found.
*/
struct snd_soc_dai *snd_soc_find_dai(
const struct snd_soc_dai_link_component *dlc)
{
struct snd_soc_component *component;
struct snd_soc_dai *dai;
struct device_node *component_of_node;
lockdep_assert_held(&client_mutex);
/* Find CPU DAI from registered DAIs*/
list_for_each_entry(component, &component_list, list) {
component_of_node = component->dev->of_node;
if (!component_of_node && component->dev->parent)
component_of_node = component->dev->parent->of_node;
if (dlc->of_node && component_of_node != dlc->of_node)
continue;
if (dlc->name && strcmp(component->name, dlc->name))
continue;
list_for_each_entry(dai, &component->dai_list, list) {
if (dlc->dai_name && strcmp(dai->name, dlc->dai_name))
continue;
return dai;
}
}
return NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_find_dai);
/**
* snd_soc_find_dai_link - Find a DAI link
*
* @card: soc card
* @id: DAI link ID to match
* @name: DAI link name to match, optional
* @stream_name: DAI link stream name to match, optional
*
* This function will search all existing DAI links of the soc card to
* find the link of the same ID. Since DAI links may not have their
* unique ID, so name and stream name should also match if being
* specified.
*
* Return: pointer of DAI link, or NULL if not found.
*/
struct snd_soc_dai_link *snd_soc_find_dai_link(struct snd_soc_card *card,
int id, const char *name,
const char *stream_name)
{
struct snd_soc_dai_link *link, *_link;
lockdep_assert_held(&client_mutex);
list_for_each_entry_safe(link, _link, &card->dai_link_list, list) {
if (link->id != id)
continue;
if (name && (!link->name || strcmp(name, link->name)))
continue;
if (stream_name && (!link->stream_name
|| strcmp(stream_name, link->stream_name)))
continue;
return link;
}
return NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_find_dai_link);
static bool soc_is_dai_link_bound(struct snd_soc_card *card,
struct snd_soc_dai_link *dai_link)
{
struct snd_soc_pcm_runtime *rtd;
list_for_each_entry(rtd, &card->rtd_list, list) {
if (rtd->dai_link == dai_link)
return true;
}
return false;
}
static int soc_bind_dai_link(struct snd_soc_card *card,
struct snd_soc_dai_link *dai_link)
{
struct snd_soc_pcm_runtime *rtd;
struct snd_soc_dai_link_component *codecs = dai_link->codecs;
struct snd_soc_dai_link_component cpu_dai_component;
struct snd_soc_dai **codec_dais;
struct snd_soc_platform *platform;
struct device_node *platform_of_node;
const char *platform_name;
int i;
dev_dbg(card->dev, "ASoC: binding %s\n", dai_link->name);
if (soc_is_dai_link_bound(card, dai_link)) {
dev_dbg(card->dev, "ASoC: dai link %s already bound\n",
dai_link->name);
return 0;
}
rtd = soc_new_pcm_runtime(card, dai_link);
if (!rtd)
return -ENOMEM;
cpu_dai_component.name = dai_link->cpu_name;
cpu_dai_component.of_node = dai_link->cpu_of_node;
cpu_dai_component.dai_name = dai_link->cpu_dai_name;
rtd->cpu_dai = snd_soc_find_dai(&cpu_dai_component);
if (!rtd->cpu_dai) {
dev_err(card->dev, "ASoC: CPU DAI %s not registered\n",
dai_link->cpu_dai_name);
goto _err_defer;
}
rtd->num_codecs = dai_link->num_codecs;
/* Find CODEC from registered CODECs */
codec_dais = rtd->codec_dais;
for (i = 0; i < rtd->num_codecs; i++) {
codec_dais[i] = snd_soc_find_dai(&codecs[i]);
if (!codec_dais[i]) {
dev_err(card->dev, "ASoC: CODEC DAI %s not registered\n",
codecs[i].dai_name);
goto _err_defer;
}
}
/* Single codec links expect codec and codec_dai in runtime data */
rtd->codec_dai = codec_dais[0];
rtd->codec = rtd->codec_dai->codec;
/* if there's no platform we match on the empty platform */
platform_name = dai_link->platform_name;
if (!platform_name && !dai_link->platform_of_node)
platform_name = "snd-soc-dummy";
/* find one from the set of registered platforms */
list_for_each_entry(platform, &platform_list, list) {
platform_of_node = platform->dev->of_node;
if (!platform_of_node && platform->dev->parent->of_node)
platform_of_node = platform->dev->parent->of_node;
if (dai_link->platform_of_node) {
if (platform_of_node != dai_link->platform_of_node)
continue;
} else {
if (strcmp(platform->component.name, platform_name))
continue;
}
rtd->platform = platform;
}
if (!rtd->platform) {
dev_err(card->dev, "ASoC: platform %s not registered\n",
dai_link->platform_name);
goto _err_defer;
}
soc_add_pcm_runtime(card, rtd);
return 0;
_err_defer:
soc_free_pcm_runtime(rtd);
return -EPROBE_DEFER;
}
static void soc_remove_component(struct snd_soc_component *component)
{
if (!component->card)
return;
list_del(&component->card_list);
if (component->remove)
component->remove(component);
snd_soc_dapm_free(snd_soc_component_get_dapm(component));
soc_cleanup_component_debugfs(component);
component->card = NULL;
module_put(component->dev->driver->owner);
}
static void soc_remove_dai(struct snd_soc_dai *dai, int order)
{
int err;
if (dai && dai->probed &&
dai->driver->remove_order == order) {
if (dai->driver->remove) {
err = dai->driver->remove(dai);
if (err < 0)
dev_err(dai->dev,
"ASoC: failed to remove %s: %d\n",
dai->name, err);
}
dai->probed = 0;
}
}
static void soc_remove_link_dais(struct snd_soc_card *card,
struct snd_soc_pcm_runtime *rtd, int order)
{
int i;
/* unregister the rtd device */
if (rtd->dev_registered) {
device_unregister(rtd->dev);
rtd->dev_registered = 0;
}
/* remove the CODEC DAI */
for (i = 0; i < rtd->num_codecs; i++)
soc_remove_dai(rtd->codec_dais[i], order);
soc_remove_dai(rtd->cpu_dai, order);
}
static void soc_remove_link_components(struct snd_soc_card *card,
struct snd_soc_pcm_runtime *rtd, int order)
{
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
struct snd_soc_platform *platform = rtd->platform;
struct snd_soc_component *component;
int i;
/* remove the platform */
if (platform && platform->component.driver->remove_order == order)
soc_remove_component(&platform->component);
/* remove the CODEC-side CODEC */
for (i = 0; i < rtd->num_codecs; i++) {
component = rtd->codec_dais[i]->component;
if (component->driver->remove_order == order)
soc_remove_component(component);
}
/* remove any CPU-side CODEC */
if (cpu_dai) {
if (cpu_dai->component->driver->remove_order == order)
soc_remove_component(cpu_dai->component);
}
}
static void soc_remove_dai_links(struct snd_soc_card *card)
{
int order;
struct snd_soc_pcm_runtime *rtd;
struct snd_soc_dai_link *link, *_link;
for (order = SND_SOC_COMP_ORDER_FIRST; order <= SND_SOC_COMP_ORDER_LAST;
order++) {
list_for_each_entry(rtd, &card->rtd_list, list)
soc_remove_link_dais(card, rtd, order);
}
for (order = SND_SOC_COMP_ORDER_FIRST; order <= SND_SOC_COMP_ORDER_LAST;
order++) {
list_for_each_entry(rtd, &card->rtd_list, list)
soc_remove_link_components(card, rtd, order);
}
list_for_each_entry_safe(link, _link, &card->dai_link_list, list) {
if (link->dobj.type == SND_SOC_DOBJ_DAI_LINK)
dev_warn(card->dev, "Topology forgot to remove link %s?\n",
link->name);
list_del(&link->list);
card->num_dai_links--;
}
}
static int snd_soc_init_multicodec(struct snd_soc_card *card,
struct snd_soc_dai_link *dai_link)
{
/* Legacy codec/codec_dai link is a single entry in multicodec */
if (dai_link->codec_name || dai_link->codec_of_node ||
dai_link->codec_dai_name) {
dai_link->num_codecs = 1;
dai_link->codecs = devm_kzalloc(card->dev,
sizeof(struct snd_soc_dai_link_component),
GFP_KERNEL);
if (!dai_link->codecs)
return -ENOMEM;
dai_link->codecs[0].name = dai_link->codec_name;
dai_link->codecs[0].of_node = dai_link->codec_of_node;
dai_link->codecs[0].dai_name = dai_link->codec_dai_name;
}
if (!dai_link->codecs) {
dev_err(card->dev, "ASoC: DAI link has no CODECs\n");
return -EINVAL;
}
return 0;
}
static int soc_init_dai_link(struct snd_soc_card *card,
struct snd_soc_dai_link *link)
{
int i, ret;
ret = snd_soc_init_multicodec(card, link);
if (ret) {
dev_err(card->dev, "ASoC: failed to init multicodec\n");
return ret;
}
for (i = 0; i < link->num_codecs; i++) {
/*
* Codec must be specified by 1 of name or OF node,
* not both or neither.
*/
if (!!link->codecs[i].name ==
!!link->codecs[i].of_node) {
dev_err(card->dev, "ASoC: Neither/both codec name/of_node are set for %s\n",
link->name);
return -EINVAL;
}
/* Codec DAI name must be specified */
if (!link->codecs[i].dai_name) {
dev_err(card->dev, "ASoC: codec_dai_name not set for %s\n",
link->name);
return -EINVAL;
}
}
/*
* Platform may be specified by either name or OF node, but
* can be left unspecified, and a dummy platform will be used.
*/
if (link->platform_name && link->platform_of_node) {
dev_err(card->dev,
"ASoC: Both platform name/of_node are set for %s\n",
link->name);
return -EINVAL;
}
/*
* CPU device may be specified by either name or OF node, but
* can be left unspecified, and will be matched based on DAI
* name alone..
*/
if (link->cpu_name && link->cpu_of_node) {
dev_err(card->dev,
"ASoC: Neither/both cpu name/of_node are set for %s\n",
link->name);
return -EINVAL;
}
/*
* At least one of CPU DAI name or CPU device name/node must be
* specified
*/
if (!link->cpu_dai_name &&
!(link->cpu_name || link->cpu_of_node)) {
dev_err(card->dev,
"ASoC: Neither cpu_dai_name nor cpu_name/of_node are set for %s\n",
link->name);
return -EINVAL;
}
return 0;
}
/**
* snd_soc_add_dai_link - Add a DAI link dynamically
* @card: The ASoC card to which the DAI link is added
* @dai_link: The new DAI link to add
*
* This function adds a DAI link to the ASoC card's link list.
*
* Note: Topology can use this API to add DAI links when probing the
* topology component. And machine drivers can still define static
* DAI links in dai_link array.
*/
int snd_soc_add_dai_link(struct snd_soc_card *card,
struct snd_soc_dai_link *dai_link)
{
if (dai_link->dobj.type
&& dai_link->dobj.type != SND_SOC_DOBJ_DAI_LINK) {
dev_err(card->dev, "Invalid dai link type %d\n",
dai_link->dobj.type);
return -EINVAL;
}
lockdep_assert_held(&client_mutex);
/* Notify the machine driver for extra initialization
* on the link created by topology.
*/
if (dai_link->dobj.type && card->add_dai_link)
card->add_dai_link(card, dai_link);
list_add_tail(&dai_link->list, &card->dai_link_list);
card->num_dai_links++;
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_add_dai_link);
/**
* snd_soc_remove_dai_link - Remove a DAI link from the list
* @card: The ASoC card that owns the link
* @dai_link: The DAI link to remove
*
* This function removes a DAI link from the ASoC card's link list.
*
* For DAI links previously added by topology, topology should
* remove them by using the dobj embedded in the link.
*/
void snd_soc_remove_dai_link(struct snd_soc_card *card,
struct snd_soc_dai_link *dai_link)
{
struct snd_soc_dai_link *link, *_link;
if (dai_link->dobj.type
&& dai_link->dobj.type != SND_SOC_DOBJ_DAI_LINK) {
dev_err(card->dev, "Invalid dai link type %d\n",
dai_link->dobj.type);
return;
}
lockdep_assert_held(&client_mutex);
/* Notify the machine driver for extra destruction
* on the link created by topology.
*/
if (dai_link->dobj.type && card->remove_dai_link)
card->remove_dai_link(card, dai_link);
list_for_each_entry_safe(link, _link, &card->dai_link_list, list) {
if (link == dai_link) {
list_del(&link->list);
card->num_dai_links--;
return;
}
}
}
EXPORT_SYMBOL_GPL(snd_soc_remove_dai_link);
static void soc_set_name_prefix(struct snd_soc_card *card,
struct snd_soc_component *component)
{
int i;
if (card->codec_conf == NULL)
return;
for (i = 0; i < card->num_configs; i++) {
struct snd_soc_codec_conf *map = &card->codec_conf[i];
if (map->of_node && component->dev->of_node != map->of_node)
continue;
if (map->dev_name && strcmp(component->name, map->dev_name))
continue;
component->name_prefix = map->name_prefix;
break;
}
}
static int soc_probe_component(struct snd_soc_card *card,
struct snd_soc_component *component)
{
struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(component);
struct snd_soc_dai *dai;
int ret;
if (!strcmp(component->name, "snd-soc-dummy"))
return 0;
if (component->card) {
if (component->card != card) {
dev_err(component->dev,
"Trying to bind component to card \"%s\" but is already bound to card \"%s\"\n",
card->name, component->card->name);
return -ENODEV;
}
return 0;
}
if (!try_module_get(component->dev->driver->owner))
return -ENODEV;
component->card = card;
dapm->card = card;
soc_set_name_prefix(card, component);
soc_init_component_debugfs(component);
if (component->dapm_widgets) {
ret = snd_soc_dapm_new_controls(dapm, component->dapm_widgets,
component->num_dapm_widgets);
if (ret != 0) {
dev_err(component->dev,
"Failed to create new controls %d\n", ret);
goto err_probe;
}
}
list_for_each_entry(dai, &component->dai_list, list) {
ret = snd_soc_dapm_new_dai_widgets(dapm, dai);
if (ret != 0) {
dev_err(component->dev,
"Failed to create DAI widgets %d\n", ret);
goto err_probe;
}
}
if (component->probe) {
ret = component->probe(component);
if (ret < 0) {
dev_err(component->dev,
"ASoC: failed to probe component %d\n", ret);
goto err_probe;
}
WARN(dapm->idle_bias_off &&
dapm->bias_level != SND_SOC_BIAS_OFF,
"codec %s can not start from non-off bias with idle_bias_off==1\n",
component->name);
}
/* machine specific init */
if (component->init) {
ret = component->init(component);
if (ret < 0) {
dev_err(component->dev,
"Failed to do machine specific init %d\n", ret);
goto err_probe;
}
}
if (component->controls)
snd_soc_add_component_controls(component, component->controls,
component->num_controls);
if (component->dapm_routes)
snd_soc_dapm_add_routes(dapm, component->dapm_routes,
component->num_dapm_routes);
list_add(&dapm->list, &card->dapm_list);
list_add(&component->card_list, &card->component_dev_list);
return 0;
err_probe:
soc_cleanup_component_debugfs(component);
component->card = NULL;
module_put(component->dev->driver->owner);
return ret;
}
static void rtd_release(struct device *dev)
{
kfree(dev);
}
static int soc_post_component_init(struct snd_soc_pcm_runtime *rtd,
const char *name)
{
int ret = 0;
/* register the rtd device */
rtd->dev = kzalloc(sizeof(struct device), GFP_KERNEL);
if (!rtd->dev)
return -ENOMEM;
device_initialize(rtd->dev);
rtd->dev->parent = rtd->card->dev;
rtd->dev->release = rtd_release;
rtd->dev->groups = soc_dev_attr_groups;
dev_set_name(rtd->dev, "%s", name);
dev_set_drvdata(rtd->dev, rtd);
mutex_init(&rtd->pcm_mutex);
INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients);
INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_CAPTURE].be_clients);
INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_PLAYBACK].fe_clients);
INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_CAPTURE].fe_clients);
ret = device_add(rtd->dev);
if (ret < 0) {
/* calling put_device() here to free the rtd->dev */
put_device(rtd->dev);
dev_err(rtd->card->dev,
"ASoC: failed to register runtime device: %d\n", ret);
return ret;
}
rtd->dev_registered = 1;
return 0;
}
static int soc_probe_link_components(struct snd_soc_card *card,
struct snd_soc_pcm_runtime *rtd,
int order)
{
struct snd_soc_platform *platform = rtd->platform;
struct snd_soc_component *component;
int i, ret;
/* probe the CPU-side component, if it is a CODEC */
component = rtd->cpu_dai->component;
if (component->driver->probe_order == order) {
ret = soc_probe_component(card, component);
if (ret < 0)
return ret;
}
/* probe the CODEC-side components */
for (i = 0; i < rtd->num_codecs; i++) {
component = rtd->codec_dais[i]->component;
if (component->driver->probe_order == order) {
ret = soc_probe_component(card, component);
if (ret < 0)
return ret;
}
}
/* probe the platform */
if (platform->component.driver->probe_order == order) {
ret = soc_probe_component(card, &platform->component);
if (ret < 0)
return ret;
}
return 0;
}
static int soc_probe_dai(struct snd_soc_dai *dai, int order)
{
int ret;
if (!dai->probed && dai->driver->probe_order == order) {
if (dai->driver->probe) {
ret = dai->driver->probe(dai);
if (ret < 0) {
dev_err(dai->dev,
"ASoC: failed to probe DAI %s: %d\n",
dai->name, ret);
return ret;
}
}
dai->probed = 1;
}
return 0;
}
static int soc_link_dai_pcm_new(struct snd_soc_dai **dais, int num_dais,
struct snd_soc_pcm_runtime *rtd)
{
int i, ret = 0;
for (i = 0; i < num_dais; ++i) {
struct snd_soc_dai_driver *drv = dais[i]->driver;
if (!rtd->dai_link->no_pcm && drv->pcm_new)
ret = drv->pcm_new(rtd, dais[i]);
if (ret < 0) {
dev_err(dais[i]->dev,
"ASoC: Failed to bind %s with pcm device\n",
dais[i]->name);
return ret;
}
}
return 0;
}
static int soc_link_dai_widgets(struct snd_soc_card *card,
struct snd_soc_dai_link *dai_link,
struct snd_soc_pcm_runtime *rtd)
{
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
struct snd_soc_dai *codec_dai = rtd->codec_dai;
struct snd_soc_dapm_widget *sink, *source;
int ret;
if (rtd->num_codecs > 1)
dev_warn(card->dev, "ASoC: Multiple codecs not supported yet\n");
/* link the DAI widgets */
sink = codec_dai->playback_widget;
source = cpu_dai->capture_widget;
if (sink && source) {
ret = snd_soc_dapm_new_pcm(card, dai_link->params,
dai_link->num_params,
source, sink);
if (ret != 0) {
dev_err(card->dev, "ASoC: Can't link %s to %s: %d\n",
sink->name, source->name, ret);
return ret;
}
}
sink = cpu_dai->playback_widget;
source = codec_dai->capture_widget;
if (sink && source) {
ret = snd_soc_dapm_new_pcm(card, dai_link->params,
dai_link->num_params,
source, sink);
if (ret != 0) {
dev_err(card->dev, "ASoC: Can't link %s to %s: %d\n",
sink->name, source->name, ret);
return ret;
}
}
return 0;
}
static int soc_probe_link_dais(struct snd_soc_card *card,
struct snd_soc_pcm_runtime *rtd, int order)
{
struct snd_soc_dai_link *dai_link = rtd->dai_link;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
int i, ret;
dev_dbg(card->dev, "ASoC: probe %s dai link %d late %d\n",
card->name, rtd->num, order);
/* set default power off timeout */
rtd->pmdown_time = pmdown_time;
ret = soc_probe_dai(cpu_dai, order);
if (ret)
return ret;
/* probe the CODEC DAI */
for (i = 0; i < rtd->num_codecs; i++) {
ret = soc_probe_dai(rtd->codec_dais[i], order);
if (ret)
return ret;
}
/* complete DAI probe during last probe */
if (order != SND_SOC_COMP_ORDER_LAST)
return 0;
/* do machine specific initialization */
if (dai_link->init) {
ret = dai_link->init(rtd);
if (ret < 0) {
dev_err(card->dev, "ASoC: failed to init %s: %d\n",
dai_link->name, ret);
return ret;
}
}
if (dai_link->dai_fmt)
snd_soc_runtime_set_dai_fmt(rtd, dai_link->dai_fmt);
ret = soc_post_component_init(rtd, dai_link->name);
if (ret)
return ret;
#ifdef CONFIG_DEBUG_FS
/* add DPCM sysfs entries */
if (dai_link->dynamic)
soc_dpcm_debugfs_add(rtd);
#endif
if (cpu_dai->driver->compress_new) {
/*create compress_device"*/
ret = cpu_dai->driver->compress_new(rtd, rtd->num);
if (ret < 0) {
dev_err(card->dev, "ASoC: can't create compress %s\n",
dai_link->stream_name);
return ret;
}
} else {
if (!dai_link->params) {
/* create the pcm */
ret = soc_new_pcm(rtd, rtd->num);
if (ret < 0) {
dev_err(card->dev, "ASoC: can't create pcm %s :%d\n",
dai_link->stream_name, ret);
return ret;
}
ret = soc_link_dai_pcm_new(&cpu_dai, 1, rtd);
if (ret < 0)
return ret;
ret = soc_link_dai_pcm_new(rtd->codec_dais,
rtd->num_codecs, rtd);
if (ret < 0)
return ret;
} else {
INIT_DELAYED_WORK(&rtd->delayed_work,
codec2codec_close_delayed_work);
/* link the DAI widgets */
ret = soc_link_dai_widgets(card, dai_link, rtd);
if (ret)
return ret;
}
}
return 0;
}
static int soc_bind_aux_dev(struct snd_soc_card *card, int num)
{
struct snd_soc_aux_dev *aux_dev = &card->aux_dev[num];
struct snd_soc_component *component;
const char *name;
struct device_node *codec_of_node;
if (aux_dev->codec_of_node || aux_dev->codec_name) {
/* codecs, usually analog devices */
name = aux_dev->codec_name;
codec_of_node = aux_dev->codec_of_node;
component = soc_find_component(codec_of_node, name);
if (!component) {
if (codec_of_node)
name = of_node_full_name(codec_of_node);
goto err_defer;
}
} else if (aux_dev->name) {
/* generic components */
name = aux_dev->name;
component = soc_find_component(NULL, name);
if (!component)
goto err_defer;
} else {
dev_err(card->dev, "ASoC: Invalid auxiliary device\n");
return -EINVAL;
}
component->init = aux_dev->init;
list_add(&component->card_aux_list, &card->aux_comp_list);
return 0;
err_defer:
dev_err(card->dev, "ASoC: %s not registered\n", name);
return -EPROBE_DEFER;
}
static int soc_probe_aux_devices(struct snd_soc_card *card)
{
struct snd_soc_component *comp;
int order;
int ret;
for (order = SND_SOC_COMP_ORDER_FIRST; order <= SND_SOC_COMP_ORDER_LAST;
order++) {
list_for_each_entry(comp, &card->aux_comp_list, card_aux_list) {
if (comp->driver->probe_order == order) {
ret = soc_probe_component(card, comp);
if (ret < 0) {
dev_err(card->dev,
"ASoC: failed to probe aux component %s %d\n",
comp->name, ret);
return ret;
}
}
}
}
return 0;
}
static void soc_remove_aux_devices(struct snd_soc_card *card)
{
struct snd_soc_component *comp, *_comp;
int order;
for (order = SND_SOC_COMP_ORDER_FIRST; order <= SND_SOC_COMP_ORDER_LAST;
order++) {
list_for_each_entry_safe(comp, _comp,
&card->aux_comp_list, card_aux_list) {
if (comp->driver->remove_order == order) {
soc_remove_component(comp);
/* remove it from the card's aux_comp_list */
list_del(&comp->card_aux_list);
}
}
}
}
static int snd_soc_init_codec_cache(struct snd_soc_codec *codec)
{
int ret;
if (codec->cache_init)
return 0;
ret = snd_soc_cache_init(codec);
if (ret < 0) {
dev_err(codec->dev,
"ASoC: Failed to set cache compression type: %d\n",
ret);
return ret;
}
codec->cache_init = 1;
return 0;
}
/**
* snd_soc_runtime_set_dai_fmt() - Change DAI link format for a ASoC runtime
* @rtd: The runtime for which the DAI link format should be changed
* @dai_fmt: The new DAI link format
*
* This function updates the DAI link format for all DAIs connected to the DAI
* link for the specified runtime.
*
* Note: For setups with a static format set the dai_fmt field in the
* corresponding snd_dai_link struct instead of using this function.
*
* Returns 0 on success, otherwise a negative error code.
*/
int snd_soc_runtime_set_dai_fmt(struct snd_soc_pcm_runtime *rtd,
unsigned int dai_fmt)
{
struct snd_soc_dai **codec_dais = rtd->codec_dais;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
unsigned int i;
int ret;
for (i = 0; i < rtd->num_codecs; i++) {
struct snd_soc_dai *codec_dai = codec_dais[i];
ret = snd_soc_dai_set_fmt(codec_dai, dai_fmt);
if (ret != 0 && ret != -ENOTSUPP) {
dev_warn(codec_dai->dev,
"ASoC: Failed to set DAI format: %d\n", ret);
return ret;
}
}
/* Flip the polarity for the "CPU" end of a CODEC<->CODEC link */
if (cpu_dai->codec) {
unsigned int inv_dai_fmt;
inv_dai_fmt = dai_fmt & ~SND_SOC_DAIFMT_MASTER_MASK;
switch (dai_fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBM_CFM:
inv_dai_fmt |= SND_SOC_DAIFMT_CBS_CFS;
break;
case SND_SOC_DAIFMT_CBM_CFS:
inv_dai_fmt |= SND_SOC_DAIFMT_CBS_CFM;
break;
case SND_SOC_DAIFMT_CBS_CFM:
inv_dai_fmt |= SND_SOC_DAIFMT_CBM_CFS;
break;
case SND_SOC_DAIFMT_CBS_CFS:
inv_dai_fmt |= SND_SOC_DAIFMT_CBM_CFM;
break;
}
dai_fmt = inv_dai_fmt;
}
ret = snd_soc_dai_set_fmt(cpu_dai, dai_fmt);
if (ret != 0 && ret != -ENOTSUPP) {
dev_warn(cpu_dai->dev,
"ASoC: Failed to set DAI format: %d\n", ret);
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_runtime_set_dai_fmt);
#ifdef CONFIG_DMI
/* Trim special characters, and replace '-' with '_' since '-' is used to
* separate different DMI fields in the card long name. Only number and
* alphabet characters and a few separator characters are kept.
*/
static void cleanup_dmi_name(char *name)
{
int i, j = 0;
for (i = 0; name[i]; i++) {
if (isalnum(name[i]) || (name[i] == '.')
|| (name[i] == '_'))
name[j++] = name[i];
else if (name[i] == '-')
name[j++] = '_';
}
name[j] = '\0';
}
/**
* snd_soc_set_dmi_name() - Register DMI names to card
* @card: The card to register DMI names
* @flavour: The flavour "differentiator" for the card amongst its peers.
*
* An Intel machine driver may be used by many different devices but are
* difficult for userspace to differentiate, since machine drivers ususally
* use their own name as the card short name and leave the card long name
* blank. To differentiate such devices and fix bugs due to lack of
* device-specific configurations, this function allows DMI info to be used
* as the sound card long name, in the format of
* "vendor-product-version-board"
* (Character '-' is used to separate different DMI fields here).
* This will help the user space to load the device-specific Use Case Manager
* (UCM) configurations for the card.
*
* Possible card long names may be:
* DellInc.-XPS139343-01-0310JH
* ASUSTeKCOMPUTERINC.-T100TA-1.0-T100TA
* Circuitco-MinnowboardMaxD0PLATFORM-D0-MinnowBoardMAX
*
* This function also supports flavoring the card longname to provide
* the extra differentiation, like "vendor-product-version-board-flavor".
*
* We only keep number and alphabet characters and a few separator characters
* in the card long name since UCM in the user space uses the card long names
* as card configuration directory names and AudoConf cannot support special
* charactors like SPACE.
*
* Returns 0 on success, otherwise a negative error code.
*/
int snd_soc_set_dmi_name(struct snd_soc_card *card, const char *flavour)
{
const char *vendor, *product, *product_version, *board;
size_t longname_buf_size = sizeof(card->snd_card->longname);
size_t len;
if (card->long_name)
return 0; /* long name already set by driver or from DMI */
/* make up dmi long name as: vendor.product.version.board */
vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
if (!vendor) {
dev_warn(card->dev, "ASoC: no DMI vendor name!\n");
return 0;
}
snprintf(card->dmi_longname, sizeof(card->snd_card->longname),
"%s", vendor);
cleanup_dmi_name(card->dmi_longname);
product = dmi_get_system_info(DMI_PRODUCT_NAME);
if (product) {
len = strlen(card->dmi_longname);
snprintf(card->dmi_longname + len,
longname_buf_size - len,
"-%s", product);
len++; /* skip the separator "-" */
if (len < longname_buf_size)
cleanup_dmi_name(card->dmi_longname + len);
/* some vendors like Lenovo may only put a self-explanatory
* name in the product version field
*/
product_version = dmi_get_system_info(DMI_PRODUCT_VERSION);
if (product_version) {
len = strlen(card->dmi_longname);
snprintf(card->dmi_longname + len,
longname_buf_size - len,
"-%s", product_version);
len++;
if (len < longname_buf_size)
cleanup_dmi_name(card->dmi_longname + len);
}
}
board = dmi_get_system_info(DMI_BOARD_NAME);
if (board) {
len = strlen(card->dmi_longname);
snprintf(card->dmi_longname + len,
longname_buf_size - len,
"-%s", board);
len++;
if (len < longname_buf_size)
cleanup_dmi_name(card->dmi_longname + len);
} else if (!product) {
/* fall back to using legacy name */
dev_warn(card->dev, "ASoC: no DMI board/product name!\n");
return 0;
}
/* Add flavour to dmi long name */
if (flavour) {
len = strlen(card->dmi_longname);
snprintf(card->dmi_longname + len,
longname_buf_size - len,
"-%s", flavour);
len++;
if (len < longname_buf_size)
cleanup_dmi_name(card->dmi_longname + len);
}
/* set the card long name */
card->long_name = card->dmi_longname;
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_set_dmi_name);
#endif /* CONFIG_DMI */
static int snd_soc_instantiate_card(struct snd_soc_card *card)
{
struct snd_soc_codec *codec;
struct snd_soc_pcm_runtime *rtd;
struct snd_soc_dai_link *dai_link;
int ret, i, order;
mutex_lock(&client_mutex);
mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_INIT);
/* bind DAIs */
for (i = 0; i < card->num_links; i++) {
ret = soc_bind_dai_link(card, &card->dai_link[i]);
if (ret != 0)
goto base_error;
}
/* bind aux_devs too */
for (i = 0; i < card->num_aux_devs; i++) {
ret = soc_bind_aux_dev(card, i);
if (ret != 0)
goto base_error;
}
/* add predefined DAI links to the list */
for (i = 0; i < card->num_links; i++)
snd_soc_add_dai_link(card, card->dai_link+i);
/* initialize the register cache for each available codec */
list_for_each_entry(codec, &codec_list, list) {
if (codec->cache_init)
continue;
ret = snd_soc_init_codec_cache(codec);
if (ret < 0)
goto base_error;
}
/* card bind complete so register a sound card */
ret = snd_card_new(card->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
card->owner, 0, &card->snd_card);
if (ret < 0) {
dev_err(card->dev,
"ASoC: can't create sound card for card %s: %d\n",
card->name, ret);
goto base_error;
}
soc_init_card_debugfs(card);
card->dapm.bias_level = SND_SOC_BIAS_OFF;
card->dapm.dev = card->dev;
card->dapm.card = card;
list_add(&card->dapm.list, &card->dapm_list);
#ifdef CONFIG_DEBUG_FS
snd_soc_dapm_debugfs_init(&card->dapm, card->debugfs_card_root);
#endif
#ifdef CONFIG_PM_SLEEP
/* deferred resume work */
INIT_WORK(&card->deferred_resume_work, soc_resume_deferred);
#endif
if (card->dapm_widgets)
snd_soc_dapm_new_controls(&card->dapm, card->dapm_widgets,
card->num_dapm_widgets);
if (card->of_dapm_widgets)
snd_soc_dapm_new_controls(&card->dapm, card->of_dapm_widgets,
card->num_of_dapm_widgets);
/* initialise the sound card only once */
if (card->probe) {
ret = card->probe(card);
if (ret < 0)
goto card_probe_error;
}
/* probe all components used by DAI links on this card */
for (order = SND_SOC_COMP_ORDER_FIRST; order <= SND_SOC_COMP_ORDER_LAST;
order++) {
list_for_each_entry(rtd, &card->rtd_list, list) {
ret = soc_probe_link_components(card, rtd, order);
if (ret < 0) {
dev_err(card->dev,
"ASoC: failed to instantiate card %d\n",
ret);
goto probe_dai_err;
}
}
}
/* probe auxiliary components */
ret = soc_probe_aux_devices(card);
if (ret < 0)
goto probe_dai_err;
/* Find new DAI links added during probing components and bind them.
* Components with topology may bring new DAIs and DAI links.
*/
list_for_each_entry(dai_link, &card->dai_link_list, list) {
if (soc_is_dai_link_bound(card, dai_link))
continue;
ret = soc_init_dai_link(card, dai_link);
if (ret)
goto probe_dai_err;
ret = soc_bind_dai_link(card, dai_link);
if (ret)
goto probe_dai_err;
}
/* probe all DAI links on this card */
for (order = SND_SOC_COMP_ORDER_FIRST; order <= SND_SOC_COMP_ORDER_LAST;
order++) {
list_for_each_entry(rtd, &card->rtd_list, list) {
ret = soc_probe_link_dais(card, rtd, order);
if (ret < 0) {
dev_err(card->dev,
"ASoC: failed to instantiate card %d\n",
ret);
goto probe_dai_err;
}
}
}
snd_soc_dapm_link_dai_widgets(card);
snd_soc_dapm_connect_dai_link_widgets(card);
if (card->controls)
snd_soc_add_card_controls(card, card->controls, card->num_controls);
if (card->dapm_routes)
snd_soc_dapm_add_routes(&card->dapm, card->dapm_routes,
card->num_dapm_routes);
if (card->of_dapm_routes)
snd_soc_dapm_add_routes(&card->dapm, card->of_dapm_routes,
card->num_of_dapm_routes);
/* try to set some sane longname if DMI is available */
snd_soc_set_dmi_name(card, NULL);
snprintf(card->snd_card->shortname, sizeof(card->snd_card->shortname),
"%s", card->name);
snprintf(card->snd_card->longname, sizeof(card->snd_card->longname),
"%s", card->long_name ? card->long_name : card->name);
snprintf(card->snd_card->driver, sizeof(card->snd_card->driver),
"%s", card->driver_name ? card->driver_name : card->name);
for (i = 0; i < ARRAY_SIZE(card->snd_card->driver); i++) {
switch (card->snd_card->driver[i]) {
case '_':
case '-':
case '\0':
break;
default:
if (!isalnum(card->snd_card->driver[i]))
card->snd_card->driver[i] = '_';
break;
}
}
if (card->late_probe) {
ret = card->late_probe(card);
if (ret < 0) {
dev_err(card->dev, "ASoC: %s late_probe() failed: %d\n",
card->name, ret);
goto probe_aux_dev_err;
}
}
snd_soc_dapm_new_widgets(card);
ret = snd_card_register(card->snd_card);
if (ret < 0) {
dev_err(card->dev, "ASoC: failed to register soundcard %d\n",
ret);
goto probe_aux_dev_err;
}
card->instantiated = 1;
snd_soc_dapm_sync(&card->dapm);
mutex_unlock(&card->mutex);
mutex_unlock(&client_mutex);
return 0;
probe_aux_dev_err:
soc_remove_aux_devices(card);
probe_dai_err:
soc_remove_dai_links(card);
card_probe_error:
if (card->remove)
card->remove(card);
snd_soc_dapm_free(&card->dapm);
soc_cleanup_card_debugfs(card);
snd_card_free(card->snd_card);
base_error:
soc_remove_pcm_runtimes(card);
mutex_unlock(&card->mutex);
mutex_unlock(&client_mutex);
return ret;
}
/* probes a new socdev */
static int soc_probe(struct platform_device *pdev)
{
struct snd_soc_card *card = platform_get_drvdata(pdev);
/*
* no card, so machine driver should be registering card
* we should not be here in that case so ret error
*/
if (!card)
return -EINVAL;
dev_warn(&pdev->dev,
"ASoC: machine %s should use snd_soc_register_card()\n",
card->name);
/* Bodge while we unpick instantiation */
card->dev = &pdev->dev;
return snd_soc_register_card(card);
}
static int soc_cleanup_card_resources(struct snd_soc_card *card)
{
struct snd_soc_pcm_runtime *rtd;
/* make sure any delayed work runs */
list_for_each_entry(rtd, &card->rtd_list, list)
flush_delayed_work(&rtd->delayed_work);
/* free the ALSA card at first; this syncs with pending operations */
snd_card_free(card->snd_card);
/* remove and free each DAI */
soc_remove_dai_links(card);
soc_remove_pcm_runtimes(card);
/* remove auxiliary devices */
soc_remove_aux_devices(card);
snd_soc_dapm_free(&card->dapm);
soc_cleanup_card_debugfs(card);
/* remove the card */
if (card->remove)
card->remove(card);
return 0;
}
/* removes a socdev */
static int soc_remove(struct platform_device *pdev)
{
struct snd_soc_card *card = platform_get_drvdata(pdev);
snd_soc_unregister_card(card);
return 0;
}
int snd_soc_poweroff(struct device *dev)
{
struct snd_soc_card *card = dev_get_drvdata(dev);
struct snd_soc_pcm_runtime *rtd;
if (!card->instantiated)
return 0;
/* Flush out pmdown_time work - we actually do want to run it
* now, we're shutting down so no imminent restart. */
list_for_each_entry(rtd, &card->rtd_list, list)
flush_delayed_work(&rtd->delayed_work);
snd_soc_dapm_shutdown(card);
/* deactivate pins to sleep state */
list_for_each_entry(rtd, &card->rtd_list, list) {
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
int i;
pinctrl_pm_select_sleep_state(cpu_dai->dev);
for (i = 0; i < rtd->num_codecs; i++) {
struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
pinctrl_pm_select_sleep_state(codec_dai->dev);
}
}
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_poweroff);
const struct dev_pm_ops snd_soc_pm_ops = {
.suspend = snd_soc_suspend,
.resume = snd_soc_resume,
.freeze = snd_soc_suspend,
.thaw = snd_soc_resume,
.poweroff = snd_soc_poweroff,
.restore = snd_soc_resume,
};
EXPORT_SYMBOL_GPL(snd_soc_pm_ops);
/* ASoC platform driver */
static struct platform_driver soc_driver = {
.driver = {
.name = "soc-audio",
.pm = &snd_soc_pm_ops,
},
.probe = soc_probe,
.remove = soc_remove,
};
/**
* snd_soc_cnew - create new control
* @_template: control template
* @data: control private data
* @long_name: control long name
* @prefix: control name prefix
*
* Create a new mixer control from a template control.
*
* Returns 0 for success, else error.
*/
struct snd_kcontrol *snd_soc_cnew(const struct snd_kcontrol_new *_template,
void *data, const char *long_name,
const char *prefix)
{
struct snd_kcontrol_new template;
struct snd_kcontrol *kcontrol;
char *name = NULL;
memcpy(&template, _template, sizeof(template));
template.index = 0;
if (!long_name)
long_name = template.name;
if (prefix) {
name = kasprintf(GFP_KERNEL, "%s %s", prefix, long_name);
if (!name)
return NULL;
template.name = name;
} else {
template.name = long_name;
}
kcontrol = snd_ctl_new1(&template, data);
kfree(name);
return kcontrol;
}
EXPORT_SYMBOL_GPL(snd_soc_cnew);
static int snd_soc_add_controls(struct snd_card *card, struct device *dev,
const struct snd_kcontrol_new *controls, int num_controls,
const char *prefix, void *data)
{
int err, i;
for (i = 0; i < num_controls; i++) {
const struct snd_kcontrol_new *control = &controls[i];
err = snd_ctl_add(card, snd_soc_cnew(control, data,
control->name, prefix));
if (err < 0) {
dev_err(dev, "ASoC: Failed to add %s: %d\n",
control->name, err);
return err;
}
}
return 0;
}
struct snd_kcontrol *snd_soc_card_get_kcontrol(struct snd_soc_card *soc_card,
const char *name)
{
struct snd_card *card = soc_card->snd_card;
struct snd_kcontrol *kctl;
if (unlikely(!name))
return NULL;
list_for_each_entry(kctl, &card->controls, list)
if (!strncmp(kctl->id.name, name, sizeof(kctl->id.name)))
return kctl;
return NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_card_get_kcontrol);
/**
* snd_soc_add_component_controls - Add an array of controls to a component.
*
* @component: Component to add controls to
* @controls: Array of controls to add
* @num_controls: Number of elements in the array
*
* Return: 0 for success, else error.
*/
int snd_soc_add_component_controls(struct snd_soc_component *component,
const struct snd_kcontrol_new *controls, unsigned int num_controls)
{
struct snd_card *card = component->card->snd_card;
return snd_soc_add_controls(card, component->dev, controls,
num_controls, component->name_prefix, component);
}
EXPORT_SYMBOL_GPL(snd_soc_add_component_controls);
/**
* snd_soc_add_codec_controls - add an array of controls to a codec.
* Convenience function to add a list of controls. Many codecs were
* duplicating this code.
*
* @codec: codec to add controls to
* @controls: array of controls to add
* @num_controls: number of elements in the array
*
* Return 0 for success, else error.
*/
int snd_soc_add_codec_controls(struct snd_soc_codec *codec,
const struct snd_kcontrol_new *controls, unsigned int num_controls)
{
return snd_soc_add_component_controls(&codec->component, controls,
num_controls);
}
EXPORT_SYMBOL_GPL(snd_soc_add_codec_controls);
/**
* snd_soc_add_platform_controls - add an array of controls to a platform.
* Convenience function to add a list of controls.
*
* @platform: platform to add controls to
* @controls: array of controls to add
* @num_controls: number of elements in the array
*
* Return 0 for success, else error.
*/
int snd_soc_add_platform_controls(struct snd_soc_platform *platform,
const struct snd_kcontrol_new *controls, unsigned int num_controls)
{
return snd_soc_add_component_controls(&platform->component, controls,
num_controls);
}
EXPORT_SYMBOL_GPL(snd_soc_add_platform_controls);
/**
* snd_soc_add_card_controls - add an array of controls to a SoC card.
* Convenience function to add a list of controls.
*
* @soc_card: SoC card to add controls to
* @controls: array of controls to add
* @num_controls: number of elements in the array
*
* Return 0 for success, else error.
*/
int snd_soc_add_card_controls(struct snd_soc_card *soc_card,
const struct snd_kcontrol_new *controls, int num_controls)
{
struct snd_card *card = soc_card->snd_card;
return snd_soc_add_controls(card, soc_card->dev, controls, num_controls,
NULL, soc_card);
}
EXPORT_SYMBOL_GPL(snd_soc_add_card_controls);
/**
* snd_soc_add_dai_controls - add an array of controls to a DAI.
* Convienience function to add a list of controls.
*
* @dai: DAI to add controls to
* @controls: array of controls to add
* @num_controls: number of elements in the array
*
* Return 0 for success, else error.
*/
int snd_soc_add_dai_controls(struct snd_soc_dai *dai,
const struct snd_kcontrol_new *controls, int num_controls)
{
struct snd_card *card = dai->component->card->snd_card;
return snd_soc_add_controls(card, dai->dev, controls, num_controls,
NULL, dai);
}
EXPORT_SYMBOL_GPL(snd_soc_add_dai_controls);
/**
* snd_soc_dai_set_sysclk - configure DAI system or master clock.
* @dai: DAI
* @clk_id: DAI specific clock ID
* @freq: new clock frequency in Hz
* @dir: new clock direction - input/output.
*
* Configures the DAI master (MCLK) or system (SYSCLK) clocking.
*/
int snd_soc_dai_set_sysclk(struct snd_soc_dai *dai, int clk_id,
unsigned int freq, int dir)
{
if (dai->driver && dai->driver->ops->set_sysclk)
return dai->driver->ops->set_sysclk(dai, clk_id, freq, dir);
else if (dai->codec && dai->codec->driver->set_sysclk)
return dai->codec->driver->set_sysclk(dai->codec, clk_id, 0,
freq, dir);
else
return -ENOTSUPP;
}
EXPORT_SYMBOL_GPL(snd_soc_dai_set_sysclk);
/**
* snd_soc_codec_set_sysclk - configure CODEC system or master clock.
* @codec: CODEC
* @clk_id: DAI specific clock ID
* @source: Source for the clock
* @freq: new clock frequency in Hz
* @dir: new clock direction - input/output.
*
* Configures the CODEC master (MCLK) or system (SYSCLK) clocking.
*/
int snd_soc_codec_set_sysclk(struct snd_soc_codec *codec, int clk_id,
int source, unsigned int freq, int dir)
{
if (codec->driver->set_sysclk)
return codec->driver->set_sysclk(codec, clk_id, source,
freq, dir);
else
return -ENOTSUPP;
}
EXPORT_SYMBOL_GPL(snd_soc_codec_set_sysclk);
/**
* snd_soc_dai_set_clkdiv - configure DAI clock dividers.
* @dai: DAI
* @div_id: DAI specific clock divider ID
* @div: new clock divisor.
*
* Configures the clock dividers. This is used to derive the best DAI bit and
* frame clocks from the system or master clock. It's best to set the DAI bit
* and frame clocks as low as possible to save system power.
*/
int snd_soc_dai_set_clkdiv(struct snd_soc_dai *dai,
int div_id, int div)
{
if (dai->driver && dai->driver->ops->set_clkdiv)
return dai->driver->ops->set_clkdiv(dai, div_id, div);
else
return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_dai_set_clkdiv);
/**
* snd_soc_dai_set_pll - configure DAI PLL.
* @dai: DAI
* @pll_id: DAI specific PLL ID
* @source: DAI specific source for the PLL
* @freq_in: PLL input clock frequency in Hz
* @freq_out: requested PLL output clock frequency in Hz
*
* Configures and enables PLL to generate output clock based on input clock.
*/
int snd_soc_dai_set_pll(struct snd_soc_dai *dai, int pll_id, int source,
unsigned int freq_in, unsigned int freq_out)
{
if (dai->driver && dai->driver->ops->set_pll)
return dai->driver->ops->set_pll(dai, pll_id, source,
freq_in, freq_out);
else if (dai->codec && dai->codec->driver->set_pll)
return dai->codec->driver->set_pll(dai->codec, pll_id, source,
freq_in, freq_out);
else
return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_dai_set_pll);
/*
* snd_soc_codec_set_pll - configure codec PLL.
* @codec: CODEC
* @pll_id: DAI specific PLL ID
* @source: DAI specific source for the PLL
* @freq_in: PLL input clock frequency in Hz
* @freq_out: requested PLL output clock frequency in Hz
*
* Configures and enables PLL to generate output clock based on input clock.
*/
int snd_soc_codec_set_pll(struct snd_soc_codec *codec, int pll_id, int source,
unsigned int freq_in, unsigned int freq_out)
{
if (codec->driver->set_pll)
return codec->driver->set_pll(codec, pll_id, source,
freq_in, freq_out);
else
return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_codec_set_pll);
/**
* snd_soc_dai_set_bclk_ratio - configure BCLK to sample rate ratio.
* @dai: DAI
* @ratio: Ratio of BCLK to Sample rate.
*
* Configures the DAI for a preset BCLK to sample rate ratio.
*/
int snd_soc_dai_set_bclk_ratio(struct snd_soc_dai *dai, unsigned int ratio)
{
if (dai->driver && dai->driver->ops->set_bclk_ratio)
return dai->driver->ops->set_bclk_ratio(dai, ratio);
else
return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_dai_set_bclk_ratio);
/**
* snd_soc_dai_set_fmt - configure DAI hardware audio format.
* @dai: DAI
* @fmt: SND_SOC_DAIFMT_ format value.
*
* Configures the DAI hardware format and clocking.
*/
int snd_soc_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
if (dai->driver == NULL)
return -EINVAL;
if (dai->driver->ops->set_fmt == NULL)
return -ENOTSUPP;
return dai->driver->ops->set_fmt(dai, fmt);
}
EXPORT_SYMBOL_GPL(snd_soc_dai_set_fmt);
/**
* snd_soc_xlate_tdm_slot - generate tx/rx slot mask.
* @slots: Number of slots in use.
* @tx_mask: bitmask representing active TX slots.
* @rx_mask: bitmask representing active RX slots.
*
* Generates the TDM tx and rx slot default masks for DAI.
*/
static int snd_soc_xlate_tdm_slot_mask(unsigned int slots,
unsigned int *tx_mask,
unsigned int *rx_mask)
{
if (*tx_mask || *rx_mask)
return 0;
if (!slots)
return -EINVAL;
*tx_mask = (1 << slots) - 1;
*rx_mask = (1 << slots) - 1;
return 0;
}
/**
* snd_soc_dai_set_tdm_slot() - Configures a DAI for TDM operation
* @dai: The DAI to configure
* @tx_mask: bitmask representing active TX slots.
* @rx_mask: bitmask representing active RX slots.
* @slots: Number of slots in use.
* @slot_width: Width in bits for each slot.
*
* This function configures the specified DAI for TDM operation. @slot contains
* the total number of slots of the TDM stream and @slot_with the width of each
* slot in bit clock cycles. @tx_mask and @rx_mask are bitmasks specifying the
* active slots of the TDM stream for the specified DAI, i.e. which slots the
* DAI should write to or read from. If a bit is set the corresponding slot is
* active, if a bit is cleared the corresponding slot is inactive. Bit 0 maps to
* the first slot, bit 1 to the second slot and so on. The first active slot
* maps to the first channel of the DAI, the second active slot to the second
* channel and so on.
*
* TDM mode can be disabled by passing 0 for @slots. In this case @tx_mask,
* @rx_mask and @slot_width will be ignored.
*
* Returns 0 on success, a negative error code otherwise.
*/
int snd_soc_dai_set_tdm_slot(struct snd_soc_dai *dai,
unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width)
{
if (dai->driver && dai->driver->ops->xlate_tdm_slot_mask)
dai->driver->ops->xlate_tdm_slot_mask(slots,
&tx_mask, &rx_mask);
else
snd_soc_xlate_tdm_slot_mask(slots, &tx_mask, &rx_mask);
dai->tx_mask = tx_mask;
dai->rx_mask = rx_mask;
if (dai->driver && dai->driver->ops->set_tdm_slot)
return dai->driver->ops->set_tdm_slot(dai, tx_mask, rx_mask,
slots, slot_width);
else
return -ENOTSUPP;
}
EXPORT_SYMBOL_GPL(snd_soc_dai_set_tdm_slot);
/**
* snd_soc_dai_set_channel_map - configure DAI audio channel map
* @dai: DAI
* @tx_num: how many TX channels
* @tx_slot: pointer to an array which imply the TX slot number channel
* 0~num-1 uses
* @rx_num: how many RX channels
* @rx_slot: pointer to an array which imply the RX slot number channel
* 0~num-1 uses
*
* configure the relationship between channel number and TDM slot number.
*/
int snd_soc_dai_set_channel_map(struct snd_soc_dai *dai,
unsigned int tx_num, unsigned int *tx_slot,
unsigned int rx_num, unsigned int *rx_slot)
{
if (dai->driver && dai->driver->ops->set_channel_map)
return dai->driver->ops->set_channel_map(dai, tx_num, tx_slot,
rx_num, rx_slot);
else
return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_dai_set_channel_map);
/**
* snd_soc_dai_set_tristate - configure DAI system or master clock.
* @dai: DAI
* @tristate: tristate enable
*
* Tristates the DAI so that others can use it.
*/
int snd_soc_dai_set_tristate(struct snd_soc_dai *dai, int tristate)
{
if (dai->driver && dai->driver->ops->set_tristate)
return dai->driver->ops->set_tristate(dai, tristate);
else
return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_dai_set_tristate);
/**
* snd_soc_dai_digital_mute - configure DAI system or master clock.
* @dai: DAI
* @mute: mute enable
* @direction: stream to mute
*
* Mutes the DAI DAC.
*/
int snd_soc_dai_digital_mute(struct snd_soc_dai *dai, int mute,
int direction)
{
if (!dai->driver)
return -ENOTSUPP;
if (dai->driver->ops->mute_stream)
return dai->driver->ops->mute_stream(dai, mute, direction);
else if (direction == SNDRV_PCM_STREAM_PLAYBACK &&
dai->driver->ops->digital_mute)
return dai->driver->ops->digital_mute(dai, mute);
else
return -ENOTSUPP;
}
EXPORT_SYMBOL_GPL(snd_soc_dai_digital_mute);
/**
* snd_soc_register_card - Register a card with the ASoC core
*
* @card: Card to register
*
*/
int snd_soc_register_card(struct snd_soc_card *card)
{
int i, ret;
struct snd_soc_pcm_runtime *rtd;
if (!card->name || !card->dev)
return -EINVAL;
for (i = 0; i < card->num_links; i++) {
struct snd_soc_dai_link *link = &card->dai_link[i];
ret = soc_init_dai_link(card, link);
if (ret) {
dev_err(card->dev, "ASoC: failed to init link %s\n",
link->name);
return ret;
}
}
dev_set_drvdata(card->dev, card);
snd_soc_initialize_card_lists(card);
INIT_LIST_HEAD(&card->dai_link_list);
card->num_dai_links = 0;
INIT_LIST_HEAD(&card->rtd_list);
card->num_rtd = 0;
INIT_LIST_HEAD(&card->dapm_dirty);
INIT_LIST_HEAD(&card->dobj_list);
card->instantiated = 0;
mutex_init(&card->mutex);
mutex_init(&card->dapm_mutex);
ret = snd_soc_instantiate_card(card);
if (ret != 0)
return ret;
/* deactivate pins to sleep state */
list_for_each_entry(rtd, &card->rtd_list, list) {
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
int j;
for (j = 0; j < rtd->num_codecs; j++) {
struct snd_soc_dai *codec_dai = rtd->codec_dais[j];
if (!codec_dai->active)
pinctrl_pm_select_sleep_state(codec_dai->dev);
}
if (!cpu_dai->active)
pinctrl_pm_select_sleep_state(cpu_dai->dev);
}
return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_register_card);
/**
* snd_soc_unregister_card - Unregister a card with the ASoC core
*
* @card: Card to unregister
*
*/
int snd_soc_unregister_card(struct snd_soc_card *card)
{
if (card->instantiated) {
card->instantiated = false;
snd_soc_dapm_shutdown(card);
soc_cleanup_card_resources(card);
dev_dbg(card->dev, "ASoC: Unregistered card '%s'\n", card->name);
}
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_unregister_card);
/*
* Simplify DAI link configuration by removing ".-1" from device names
* and sanitizing names.
*/
static char *fmt_single_name(struct device *dev, int *id)
{
char *found, name[NAME_SIZE];
int id1, id2;
if (dev_name(dev) == NULL)
return NULL;
strlcpy(name, dev_name(dev), NAME_SIZE);
/* are we a "%s.%d" name (platform and SPI components) */
found = strstr(name, dev->driver->name);
if (found) {
/* get ID */
if (sscanf(&found[strlen(dev->driver->name)], ".%d", id) == 1) {
/* discard ID from name if ID == -1 */
if (*id == -1)
found[strlen(dev->driver->name)] = '\0';
}
} else {
/* I2C component devices are named "bus-addr" */
if (sscanf(name, "%x-%x", &id1, &id2) == 2) {
char tmp[NAME_SIZE];
/* create unique ID number from I2C addr and bus */
*id = ((id1 & 0xffff) << 16) + id2;
/* sanitize component name for DAI link creation */
snprintf(tmp, NAME_SIZE, "%s.%s", dev->driver->name, name);
strlcpy(name, tmp, NAME_SIZE);
} else
*id = 0;
}
return kstrdup(name, GFP_KERNEL);
}
/*
* Simplify DAI link naming for single devices with multiple DAIs by removing
* any ".-1" and using the DAI name (instead of device name).
*/
static inline char *fmt_multiple_name(struct device *dev,
struct snd_soc_dai_driver *dai_drv)
{
if (dai_drv->name == NULL) {
dev_err(dev,
"ASoC: error - multiple DAI %s registered with no name\n",
dev_name(dev));
return NULL;
}
return kstrdup(dai_drv->name, GFP_KERNEL);
}
/**
* snd_soc_unregister_dai - Unregister DAIs from the ASoC core
*
* @component: The component for which the DAIs should be unregistered
*/
static void snd_soc_unregister_dais(struct snd_soc_component *component)
{
struct snd_soc_dai *dai, *_dai;
list_for_each_entry_safe(dai, _dai, &component->dai_list, list) {
dev_dbg(component->dev, "ASoC: Unregistered DAI '%s'\n",
dai->name);
list_del(&dai->list);
kfree(dai->name);
kfree(dai);
}
}
/* Create a DAI and add it to the component's DAI list */
static struct snd_soc_dai *soc_add_dai(struct snd_soc_component *component,
struct snd_soc_dai_driver *dai_drv,
bool legacy_dai_naming)
{
struct device *dev = component->dev;
struct snd_soc_dai *dai;
dev_dbg(dev, "ASoC: dynamically register DAI %s\n", dev_name(dev));
dai = kzalloc(sizeof(struct snd_soc_dai), GFP_KERNEL);
if (dai == NULL)
return NULL;
/*
* Back in the old days when we still had component-less DAIs,
* instead of having a static name, component-less DAIs would
* inherit the name of the parent device so it is possible to
* register multiple instances of the DAI. We still need to keep
* the same naming style even though those DAIs are not
* component-less anymore.
*/
if (legacy_dai_naming &&
(dai_drv->id == 0 || dai_drv->name == NULL)) {
dai->name = fmt_single_name(dev, &dai->id);
} else {
dai->name = fmt_multiple_name(dev, dai_drv);
if (dai_drv->id)
dai->id = dai_drv->id;
else
dai->id = component->num_dai;
}
if (dai->name == NULL) {
kfree(dai);
return NULL;
}
dai->component = component;
dai->dev = dev;
dai->driver = dai_drv;
if (!dai->driver->ops)
dai->driver->ops = &null_dai_ops;
list_add(&dai->list, &component->dai_list);
component->num_dai++;
dev_dbg(dev, "ASoC: Registered DAI '%s'\n", dai->name);
return dai;
}
/**
* snd_soc_register_dais - Register a DAI with the ASoC core
*
* @component: The component the DAIs are registered for
* @dai_drv: DAI driver to use for the DAIs
* @count: Number of DAIs
* @legacy_dai_naming: Use the legacy naming scheme and let the DAI inherit the
* parent's name.
*/
static int snd_soc_register_dais(struct snd_soc_component *component,
struct snd_soc_dai_driver *dai_drv, size_t count,
bool legacy_dai_naming)
{
struct device *dev = component->dev;
struct snd_soc_dai *dai;
unsigned int i;
int ret;
dev_dbg(dev, "ASoC: dai register %s #%zu\n", dev_name(dev), count);
component->dai_drv = dai_drv;
for (i = 0; i < count; i++) {
dai = soc_add_dai(component, dai_drv + i,
count == 1 && legacy_dai_naming);
if (dai == NULL) {
ret = -ENOMEM;
goto err;
}
}
return 0;
err:
snd_soc_unregister_dais(component);
return ret;
}
/**
* snd_soc_register_dai - Register a DAI dynamically & create its widgets
*
* @component: The component the DAIs are registered for
* @dai_drv: DAI driver to use for the DAI
*
* Topology can use this API to register DAIs when probing a component.
* These DAIs's widgets will be freed in the card cleanup and the DAIs
* will be freed in the component cleanup.
*/
int snd_soc_register_dai(struct snd_soc_component *component,
struct snd_soc_dai_driver *dai_drv)
{
struct snd_soc_dapm_context *dapm =
snd_soc_component_get_dapm(component);
struct snd_soc_dai *dai;
int ret;
if (dai_drv->dobj.type != SND_SOC_DOBJ_PCM) {
dev_err(component->dev, "Invalid dai type %d\n",
dai_drv->dobj.type);
return -EINVAL;
}
lockdep_assert_held(&client_mutex);
dai = soc_add_dai(component, dai_drv, false);
if (!dai)
return -ENOMEM;
/* Create the DAI widgets here. After adding DAIs, topology may
* also add routes that need these widgets as source or sink.
*/
ret = snd_soc_dapm_new_dai_widgets(dapm, dai);
if (ret != 0) {
dev_err(component->dev,
"Failed to create DAI widgets %d\n", ret);
}
return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_register_dai);
static void snd_soc_component_seq_notifier(struct snd_soc_dapm_context *dapm,
enum snd_soc_dapm_type type, int subseq)
{
struct snd_soc_component *component = dapm->component;
component->driver->seq_notifier(component, type, subseq);
}
static int snd_soc_component_stream_event(struct snd_soc_dapm_context *dapm,
int event)
{
struct snd_soc_component *component = dapm->component;
return component->driver->stream_event(component, event);
}
static int snd_soc_component_initialize(struct snd_soc_component *component,
const struct snd_soc_component_driver *driver, struct device *dev)
{
struct snd_soc_dapm_context *dapm;
component->name = fmt_single_name(dev, &component->id);
if (!component->name) {
dev_err(dev, "ASoC: Failed to allocate name\n");
return -ENOMEM;
}
component->dev = dev;
component->driver = driver;
component->probe = component->driver->probe;
component->remove = component->driver->remove;
component->suspend = component->driver->suspend;
component->resume = component->driver->resume;
component->pcm_new = component->driver->pcm_new;
component->pcm_free = component->driver->pcm_free;
dapm = &component->dapm;
dapm->dev = dev;
dapm->component = component;
dapm->bias_level = SND_SOC_BIAS_OFF;
dapm->idle_bias_off = true;
if (driver->seq_notifier)
dapm->seq_notifier = snd_soc_component_seq_notifier;
if (driver->stream_event)
dapm->stream_event = snd_soc_component_stream_event;
component->controls = driver->controls;
component->num_controls = driver->num_controls;
component->dapm_widgets = driver->dapm_widgets;
component->num_dapm_widgets = driver->num_dapm_widgets;
component->dapm_routes = driver->dapm_routes;
component->num_dapm_routes = driver->num_dapm_routes;
INIT_LIST_HEAD(&component->dai_list);
mutex_init(&component->io_mutex);
return 0;
}
static void snd_soc_component_setup_regmap(struct snd_soc_component *component)
{
int val_bytes = regmap_get_val_bytes(component->regmap);
/* Errors are legitimate for non-integer byte multiples */
if (val_bytes > 0)
component->val_bytes = val_bytes;
}
#ifdef CONFIG_REGMAP
/**
* snd_soc_component_init_regmap() - Initialize regmap instance for the component
* @component: The component for which to initialize the regmap instance
* @regmap: The regmap instance that should be used by the component
*
* This function allows deferred assignment of the regmap instance that is
* associated with the component. Only use this if the regmap instance is not
* yet ready when the component is registered. The function must also be called
* before the first IO attempt of the component.
*/
void snd_soc_component_init_regmap(struct snd_soc_component *component,
struct regmap *regmap)
{
component->regmap = regmap;
snd_soc_component_setup_regmap(component);
}
EXPORT_SYMBOL_GPL(snd_soc_component_init_regmap);
/**
* snd_soc_component_exit_regmap() - De-initialize regmap instance for the component
* @component: The component for which to de-initialize the regmap instance
*
* Calls regmap_exit() on the regmap instance associated to the component and
* removes the regmap instance from the component.
*
* This function should only be used if snd_soc_component_init_regmap() was used
* to initialize the regmap instance.
*/
void snd_soc_component_exit_regmap(struct snd_soc_component *component)
{
regmap_exit(component->regmap);
component->regmap = NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_component_exit_regmap);
#endif
static void snd_soc_component_add_unlocked(struct snd_soc_component *component)
{
if (!component->write && !component->read) {
if (!component->regmap)
component->regmap = dev_get_regmap(component->dev, NULL);
if (component->regmap)
snd_soc_component_setup_regmap(component);
}
list_add(&component->list, &component_list);
INIT_LIST_HEAD(&component->dobj_list);
}
static void snd_soc_component_add(struct snd_soc_component *component)
{
mutex_lock(&client_mutex);
snd_soc_component_add_unlocked(component);
mutex_unlock(&client_mutex);
}
static void snd_soc_component_cleanup(struct snd_soc_component *component)
{
snd_soc_unregister_dais(component);
kfree(component->name);
}
static void snd_soc_component_del_unlocked(struct snd_soc_component *component)
{
struct snd_soc_card *card = component->card;
if (card)
snd_soc_unregister_card(card);
list_del(&component->list);
}
int snd_soc_register_component(struct device *dev,
const struct snd_soc_component_driver *cmpnt_drv,
struct snd_soc_dai_driver *dai_drv,
int num_dai)
{
struct snd_soc_component *cmpnt;
int ret;
cmpnt = kzalloc(sizeof(*cmpnt), GFP_KERNEL);
if (!cmpnt) {
dev_err(dev, "ASoC: Failed to allocate memory\n");
return -ENOMEM;
}
ret = snd_soc_component_initialize(cmpnt, cmpnt_drv, dev);
if (ret)
goto err_free;
cmpnt->ignore_pmdown_time = true;
cmpnt->registered_as_component = true;
ret = snd_soc_register_dais(cmpnt, dai_drv, num_dai, true);
if (ret < 0) {
dev_err(dev, "ASoC: Failed to register DAIs: %d\n", ret);
goto err_cleanup;
}
snd_soc_component_add(cmpnt);
return 0;
err_cleanup:
snd_soc_component_cleanup(cmpnt);
err_free:
kfree(cmpnt);
return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_register_component);
/**
* snd_soc_unregister_component - Unregister a component from the ASoC core
*
* @dev: The device to unregister
*/
void snd_soc_unregister_component(struct device *dev)
{
struct snd_soc_component *cmpnt;
mutex_lock(&client_mutex);
list_for_each_entry(cmpnt, &component_list, list) {
if (dev == cmpnt->dev && cmpnt->registered_as_component)
goto found;
}
mutex_unlock(&client_mutex);
return;
found:
snd_soc_tplg_component_remove(cmpnt, SND_SOC_TPLG_INDEX_ALL);
snd_soc_component_del_unlocked(cmpnt);
mutex_unlock(&client_mutex);
snd_soc_component_cleanup(cmpnt);
kfree(cmpnt);
}
EXPORT_SYMBOL_GPL(snd_soc_unregister_component);
static int snd_soc_platform_drv_probe(struct snd_soc_component *component)
{
struct snd_soc_platform *platform = snd_soc_component_to_platform(component);
return platform->driver->probe(platform);
}
static void snd_soc_platform_drv_remove(struct snd_soc_component *component)
{
struct snd_soc_platform *platform = snd_soc_component_to_platform(component);
platform->driver->remove(platform);
}
static int snd_soc_platform_drv_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
struct snd_soc_platform *platform = rtd->platform;
if (platform->driver->pcm_new)
return platform->driver->pcm_new(rtd);
else
return 0;
}
static void snd_soc_platform_drv_pcm_free(struct snd_pcm *pcm)
{
struct snd_soc_pcm_runtime *rtd = pcm->private_data;
struct snd_soc_platform *platform = rtd->platform;
if (platform->driver->pcm_free)
platform->driver->pcm_free(pcm);
}
/**
* snd_soc_add_platform - Add a platform to the ASoC core
* @dev: The parent device for the platform
* @platform: The platform to add
* @platform_drv: The driver for the platform
*/
int snd_soc_add_platform(struct device *dev, struct snd_soc_platform *platform,
const struct snd_soc_platform_driver *platform_drv)
{
int ret;
ret = snd_soc_component_initialize(&platform->component,
&platform_drv->component_driver, dev);
if (ret)
return ret;
platform->dev = dev;
platform->driver = platform_drv;
if (platform_drv->probe)
platform->component.probe = snd_soc_platform_drv_probe;
if (platform_drv->remove)
platform->component.remove = snd_soc_platform_drv_remove;
if (platform_drv->pcm_new)
platform->component.pcm_new = snd_soc_platform_drv_pcm_new;
if (platform_drv->pcm_free)
platform->component.pcm_free = snd_soc_platform_drv_pcm_free;
#ifdef CONFIG_DEBUG_FS
platform->component.debugfs_prefix = "platform";
#endif
mutex_lock(&client_mutex);
snd_soc_component_add_unlocked(&platform->component);
list_add(&platform->list, &platform_list);
mutex_unlock(&client_mutex);
dev_dbg(dev, "ASoC: Registered platform '%s'\n",
platform->component.name);
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_add_platform);
/**
* snd_soc_register_platform - Register a platform with the ASoC core
*
* @dev: The device for the platform
* @platform_drv: The driver for the platform
*/
int snd_soc_register_platform(struct device *dev,
const struct snd_soc_platform_driver *platform_drv)
{
struct snd_soc_platform *platform;
int ret;
dev_dbg(dev, "ASoC: platform register %s\n", dev_name(dev));
platform = kzalloc(sizeof(struct snd_soc_platform), GFP_KERNEL);
if (platform == NULL)
return -ENOMEM;
ret = snd_soc_add_platform(dev, platform, platform_drv);
if (ret)
kfree(platform);
return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_register_platform);
/**
* snd_soc_remove_platform - Remove a platform from the ASoC core
* @platform: the platform to remove
*/
void snd_soc_remove_platform(struct snd_soc_platform *platform)
{
mutex_lock(&client_mutex);
list_del(&platform->list);
snd_soc_component_del_unlocked(&platform->component);
mutex_unlock(&client_mutex);
dev_dbg(platform->dev, "ASoC: Unregistered platform '%s'\n",
platform->component.name);
snd_soc_component_cleanup(&platform->component);
}
EXPORT_SYMBOL_GPL(snd_soc_remove_platform);
struct snd_soc_platform *snd_soc_lookup_platform(struct device *dev)
{
struct snd_soc_platform *platform;
mutex_lock(&client_mutex);
list_for_each_entry(platform, &platform_list, list) {
if (dev == platform->dev) {
mutex_unlock(&client_mutex);
return platform;
}
}
mutex_unlock(&client_mutex);
return NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_lookup_platform);
/**
* snd_soc_unregister_platform - Unregister a platform from the ASoC core
*
* @dev: platform to unregister
*/
void snd_soc_unregister_platform(struct device *dev)
{
struct snd_soc_platform *platform;
platform = snd_soc_lookup_platform(dev);
if (!platform)
return;
snd_soc_remove_platform(platform);
kfree(platform);
}
EXPORT_SYMBOL_GPL(snd_soc_unregister_platform);
static u64 codec_format_map[] = {
SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE,
SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE,
SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE,
SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_U24_BE,
SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE,
SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_U32_BE,
SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_U24_3BE,
SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_U24_3BE,
SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE,
SNDRV_PCM_FMTBIT_U20_3LE | SNDRV_PCM_FMTBIT_U20_3BE,
SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_S18_3BE,
SNDRV_PCM_FMTBIT_U18_3LE | SNDRV_PCM_FMTBIT_U18_3BE,
SNDRV_PCM_FMTBIT_FLOAT_LE | SNDRV_PCM_FMTBIT_FLOAT_BE,
SNDRV_PCM_FMTBIT_FLOAT64_LE | SNDRV_PCM_FMTBIT_FLOAT64_BE,
SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
| SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE,
};
/* Fix up the DAI formats for endianness: codecs don't actually see
* the endianness of the data but we're using the CPU format
* definitions which do need to include endianness so we ensure that
* codec DAIs always have both big and little endian variants set.
*/
static void fixup_codec_formats(struct snd_soc_pcm_stream *stream)
{
int i;
for (i = 0; i < ARRAY_SIZE(codec_format_map); i++)
if (stream->formats & codec_format_map[i])
stream->formats |= codec_format_map[i];
}
static int snd_soc_codec_drv_probe(struct snd_soc_component *component)
{
struct snd_soc_codec *codec = snd_soc_component_to_codec(component);
return codec->driver->probe(codec);
}
static void snd_soc_codec_drv_remove(struct snd_soc_component *component)
{
struct snd_soc_codec *codec = snd_soc_component_to_codec(component);
codec->driver->remove(codec);
}
static int snd_soc_codec_drv_suspend(struct snd_soc_component *component)
{
struct snd_soc_codec *codec = snd_soc_component_to_codec(component);
return codec->driver->suspend(codec);
}
static int snd_soc_codec_drv_resume(struct snd_soc_component *component)
{
struct snd_soc_codec *codec = snd_soc_component_to_codec(component);
return codec->driver->resume(codec);
}
static int snd_soc_codec_drv_write(struct snd_soc_component *component,
unsigned int reg, unsigned int val)
{
struct snd_soc_codec *codec = snd_soc_component_to_codec(component);
return codec->driver->write(codec, reg, val);
}
static int snd_soc_codec_drv_read(struct snd_soc_component *component,
unsigned int reg, unsigned int *val)
{
struct snd_soc_codec *codec = snd_soc_component_to_codec(component);
*val = codec->driver->read(codec, reg);
return 0;
}
static int snd_soc_codec_set_bias_level(struct snd_soc_dapm_context *dapm,
enum snd_soc_bias_level level)
{
struct snd_soc_codec *codec = snd_soc_dapm_to_codec(dapm);
return codec->driver->set_bias_level(codec, level);
}
/**
* snd_soc_register_codec - Register a codec with the ASoC core
*
* @dev: The parent device for this codec
* @codec_drv: Codec driver
* @dai_drv: The associated DAI driver
* @num_dai: Number of DAIs
*/
int snd_soc_register_codec(struct device *dev,
const struct snd_soc_codec_driver *codec_drv,
struct snd_soc_dai_driver *dai_drv,
int num_dai)
{
struct snd_soc_dapm_context *dapm;
struct snd_soc_codec *codec;
struct snd_soc_dai *dai;
int ret, i;
dev_dbg(dev, "codec register %s\n", dev_name(dev));
codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
if (codec == NULL)
return -ENOMEM;
codec->component.codec = codec;
ret = snd_soc_component_initialize(&codec->component,
&codec_drv->component_driver, dev);
if (ret)
goto err_free;
if (codec_drv->probe)
codec->component.probe = snd_soc_codec_drv_probe;
if (codec_drv->remove)
codec->component.remove = snd_soc_codec_drv_remove;
if (codec_drv->suspend)
codec->component.suspend = snd_soc_codec_drv_suspend;
if (codec_drv->resume)
codec->component.resume = snd_soc_codec_drv_resume;
if (codec_drv->write)
codec->component.write = snd_soc_codec_drv_write;
if (codec_drv->read)
codec->component.read = snd_soc_codec_drv_read;
codec->component.ignore_pmdown_time = codec_drv->ignore_pmdown_time;
dapm = snd_soc_codec_get_dapm(codec);
dapm->idle_bias_off = codec_drv->idle_bias_off;
dapm->suspend_bias_off = codec_drv->suspend_bias_off;
if (codec_drv->seq_notifier)
dapm->seq_notifier = codec_drv->seq_notifier;
if (codec_drv->set_bias_level)
dapm->set_bias_level = snd_soc_codec_set_bias_level;
codec->dev = dev;
codec->driver = codec_drv;
codec->component.val_bytes = codec_drv->reg_word_size;
#ifdef CONFIG_DEBUG_FS
codec->component.init_debugfs = soc_init_codec_debugfs;
codec->component.debugfs_prefix = "codec";
#endif
if (codec_drv->get_regmap)
codec->component.regmap = codec_drv->get_regmap(dev);
for (i = 0; i < num_dai; i++) {
fixup_codec_formats(&dai_drv[i].playback);
fixup_codec_formats(&dai_drv[i].capture);
}
ret = snd_soc_register_dais(&codec->component, dai_drv, num_dai, false);
if (ret < 0) {
dev_err(dev, "ASoC: Failed to register DAIs: %d\n", ret);
goto err_cleanup;
}
list_for_each_entry(dai, &codec->component.dai_list, list)
dai->codec = codec;
mutex_lock(&client_mutex);
snd_soc_component_add_unlocked(&codec->component);
list_add(&codec->list, &codec_list);
mutex_unlock(&client_mutex);
dev_dbg(codec->dev, "ASoC: Registered codec '%s'\n",
codec->component.name);
return 0;
err_cleanup:
snd_soc_component_cleanup(&codec->component);
err_free:
kfree(codec);
return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_register_codec);
/**
* snd_soc_unregister_codec - Unregister a codec from the ASoC core
*
* @dev: codec to unregister
*/
void snd_soc_unregister_codec(struct device *dev)
{
struct snd_soc_codec *codec;
mutex_lock(&client_mutex);
list_for_each_entry(codec, &codec_list, list) {
if (dev == codec->dev)
goto found;
}
mutex_unlock(&client_mutex);
return;
found:
list_del(&codec->list);
snd_soc_component_del_unlocked(&codec->component);
mutex_unlock(&client_mutex);
dev_dbg(codec->dev, "ASoC: Unregistered codec '%s'\n",
codec->component.name);
snd_soc_component_cleanup(&codec->component);
snd_soc_cache_exit(codec);
kfree(codec);
}
EXPORT_SYMBOL_GPL(snd_soc_unregister_codec);
/* Retrieve a card's name from device tree */
int snd_soc_of_parse_card_name(struct snd_soc_card *card,
const char *propname)
{
struct device_node *np;
int ret;
if (!card->dev) {
pr_err("card->dev is not set before calling %s\n", __func__);
return -EINVAL;
}
np = card->dev->of_node;
ret = of_property_read_string_index(np, propname, 0, &card->name);
/*
* EINVAL means the property does not exist. This is fine providing
* card->name was previously set, which is checked later in
* snd_soc_register_card.
*/
if (ret < 0 && ret != -EINVAL) {
dev_err(card->dev,
"ASoC: Property '%s' could not be read: %d\n",
propname, ret);
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_of_parse_card_name);
static const struct snd_soc_dapm_widget simple_widgets[] = {
SND_SOC_DAPM_MIC("Microphone", NULL),
SND_SOC_DAPM_LINE("Line", NULL),
SND_SOC_DAPM_HP("Headphone", NULL),
SND_SOC_DAPM_SPK("Speaker", NULL),
};
int snd_soc_of_parse_audio_simple_widgets(struct snd_soc_card *card,
const char *propname)
{
struct device_node *np = card->dev->of_node;
struct snd_soc_dapm_widget *widgets;
const char *template, *wname;
int i, j, num_widgets, ret;
num_widgets = of_property_count_strings(np, propname);
if (num_widgets < 0) {
dev_err(card->dev,
"ASoC: Property '%s' does not exist\n", propname);
return -EINVAL;
}
if (num_widgets & 1) {
dev_err(card->dev,
"ASoC: Property '%s' length is not even\n", propname);
return -EINVAL;
}
num_widgets /= 2;
if (!num_widgets) {
dev_err(card->dev, "ASoC: Property '%s's length is zero\n",
propname);
return -EINVAL;
}
widgets = devm_kcalloc(card->dev, num_widgets, sizeof(*widgets),
GFP_KERNEL);
if (!widgets) {
dev_err(card->dev,
"ASoC: Could not allocate memory for widgets\n");
return -ENOMEM;
}
for (i = 0; i < num_widgets; i++) {
ret = of_property_read_string_index(np, propname,
2 * i, &template);
if (ret) {
dev_err(card->dev,
"ASoC: Property '%s' index %d read error:%d\n",
propname, 2 * i, ret);
return -EINVAL;
}
for (j = 0; j < ARRAY_SIZE(simple_widgets); j++) {
if (!strncmp(template, simple_widgets[j].name,
strlen(simple_widgets[j].name))) {
widgets[i] = simple_widgets[j];
break;
}
}
if (j >= ARRAY_SIZE(simple_widgets)) {
dev_err(card->dev,
"ASoC: DAPM widget '%s' is not supported\n",
template);
return -EINVAL;
}
ret = of_property_read_string_index(np, propname,
(2 * i) + 1,
&wname);
if (ret) {
dev_err(card->dev,
"ASoC: Property '%s' index %d read error:%d\n",
propname, (2 * i) + 1, ret);
return -EINVAL;
}
widgets[i].name = wname;
}
card->of_dapm_widgets = widgets;
card->num_of_dapm_widgets = num_widgets;
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_of_parse_audio_simple_widgets);
static int snd_soc_of_get_slot_mask(struct device_node *np,
const char *prop_name,
unsigned int *mask)
{
u32 val;
const __be32 *of_slot_mask = of_get_property(np, prop_name, &val);
int i;
if (!of_slot_mask)
return 0;
val /= sizeof(u32);
for (i = 0; i < val; i++)
if (be32_to_cpup(&of_slot_mask[i]))
*mask |= (1 << i);
return val;
}
int snd_soc_of_parse_tdm_slot(struct device_node *np,
unsigned int *tx_mask,
unsigned int *rx_mask,
unsigned int *slots,
unsigned int *slot_width)
{
u32 val;
int ret;
if (tx_mask)
snd_soc_of_get_slot_mask(np, "dai-tdm-slot-tx-mask", tx_mask);
if (rx_mask)
snd_soc_of_get_slot_mask(np, "dai-tdm-slot-rx-mask", rx_mask);
if (of_property_read_bool(np, "dai-tdm-slot-num")) {
ret = of_property_read_u32(np, "dai-tdm-slot-num", &val);
if (ret)
return ret;
if (slots)
*slots = val;
}
if (of_property_read_bool(np, "dai-tdm-slot-width")) {
ret = of_property_read_u32(np, "dai-tdm-slot-width", &val);
if (ret)
return ret;
if (slot_width)
*slot_width = val;
}
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_of_parse_tdm_slot);
void snd_soc_of_parse_audio_prefix(struct snd_soc_card *card,
struct snd_soc_codec_conf *codec_conf,
struct device_node *of_node,
const char *propname)
{
struct device_node *np = card->dev->of_node;
const char *str;
int ret;
ret = of_property_read_string(np, propname, &str);
if (ret < 0) {
/* no prefix is not error */
return;
}
codec_conf->of_node = of_node;
codec_conf->name_prefix = str;
}
EXPORT_SYMBOL_GPL(snd_soc_of_parse_audio_prefix);
int snd_soc_of_parse_audio_routing(struct snd_soc_card *card,
const char *propname)
{
struct device_node *np = card->dev->of_node;
int num_routes;
struct snd_soc_dapm_route *routes;
int i, ret;
num_routes = of_property_count_strings(np, propname);
if (num_routes < 0 || num_routes & 1) {
dev_err(card->dev,
"ASoC: Property '%s' does not exist or its length is not even\n",
propname);
return -EINVAL;
}
num_routes /= 2;
if (!num_routes) {
dev_err(card->dev, "ASoC: Property '%s's length is zero\n",
propname);
return -EINVAL;
}
routes = devm_kzalloc(card->dev, num_routes * sizeof(*routes),
GFP_KERNEL);
if (!routes) {
dev_err(card->dev,
"ASoC: Could not allocate DAPM route table\n");
return -EINVAL;
}
for (i = 0; i < num_routes; i++) {
ret = of_property_read_string_index(np, propname,
2 * i, &routes[i].sink);
if (ret) {
dev_err(card->dev,
"ASoC: Property '%s' index %d could not be read: %d\n",
propname, 2 * i, ret);
return -EINVAL;
}
ret = of_property_read_string_index(np, propname,
(2 * i) + 1, &routes[i].source);
if (ret) {
dev_err(card->dev,
"ASoC: Property '%s' index %d could not be read: %d\n",
propname, (2 * i) + 1, ret);
return -EINVAL;
}
}
card->num_of_dapm_routes = num_routes;
card->of_dapm_routes = routes;
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_of_parse_audio_routing);
unsigned int snd_soc_of_parse_daifmt(struct device_node *np,
const char *prefix,
struct device_node **bitclkmaster,
struct device_node **framemaster)
{
int ret, i;
char prop[128];
unsigned int format = 0;
int bit, frame;
const char *str;
struct {
char *name;
unsigned int val;
} of_fmt_table[] = {
{ "i2s", SND_SOC_DAIFMT_I2S },
{ "right_j", SND_SOC_DAIFMT_RIGHT_J },
{ "left_j", SND_SOC_DAIFMT_LEFT_J },
{ "dsp_a", SND_SOC_DAIFMT_DSP_A },
{ "dsp_b", SND_SOC_DAIFMT_DSP_B },
{ "ac97", SND_SOC_DAIFMT_AC97 },
{ "pdm", SND_SOC_DAIFMT_PDM},
{ "msb", SND_SOC_DAIFMT_MSB },
{ "lsb", SND_SOC_DAIFMT_LSB },
};
if (!prefix)
prefix = "";
/*
* check "[prefix]format = xxx"
* SND_SOC_DAIFMT_FORMAT_MASK area
*/
snprintf(prop, sizeof(prop), "%sformat", prefix);
ret = of_property_read_string(np, prop, &str);
if (ret == 0) {
for (i = 0; i < ARRAY_SIZE(of_fmt_table); i++) {
if (strcmp(str, of_fmt_table[i].name) == 0) {
format |= of_fmt_table[i].val;
break;
}
}
}
/*
* check "[prefix]continuous-clock"
* SND_SOC_DAIFMT_CLOCK_MASK area
*/
snprintf(prop, sizeof(prop), "%scontinuous-clock", prefix);
if (of_property_read_bool(np, prop))
format |= SND_SOC_DAIFMT_CONT;
else
format |= SND_SOC_DAIFMT_GATED;
/*
* check "[prefix]bitclock-inversion"
* check "[prefix]frame-inversion"
* SND_SOC_DAIFMT_INV_MASK area
*/
snprintf(prop, sizeof(prop), "%sbitclock-inversion", prefix);
bit = !!of_get_property(np, prop, NULL);
snprintf(prop, sizeof(prop), "%sframe-inversion", prefix);
frame = !!of_get_property(np, prop, NULL);
switch ((bit << 4) + frame) {
case 0x11:
format |= SND_SOC_DAIFMT_IB_IF;
break;
case 0x10:
format |= SND_SOC_DAIFMT_IB_NF;
break;
case 0x01:
format |= SND_SOC_DAIFMT_NB_IF;
break;
default:
/* SND_SOC_DAIFMT_NB_NF is default */
break;
}
/*
* check "[prefix]bitclock-master"
* check "[prefix]frame-master"
* SND_SOC_DAIFMT_MASTER_MASK area
*/
snprintf(prop, sizeof(prop), "%sbitclock-master", prefix);
bit = !!of_get_property(np, prop, NULL);
if (bit && bitclkmaster)
*bitclkmaster = of_parse_phandle(np, prop, 0);
snprintf(prop, sizeof(prop), "%sframe-master", prefix);
frame = !!of_get_property(np, prop, NULL);
if (frame && framemaster)
*framemaster = of_parse_phandle(np, prop, 0);
switch ((bit << 4) + frame) {
case 0x11:
format |= SND_SOC_DAIFMT_CBM_CFM;
break;
case 0x10:
format |= SND_SOC_DAIFMT_CBM_CFS;
break;
case 0x01:
format |= SND_SOC_DAIFMT_CBS_CFM;
break;
default:
format |= SND_SOC_DAIFMT_CBS_CFS;
break;
}
return format;
}
EXPORT_SYMBOL_GPL(snd_soc_of_parse_daifmt);
int snd_soc_get_dai_name(struct of_phandle_args *args,
const char **dai_name)
{
struct snd_soc_component *pos;
struct device_node *component_of_node;
int ret = -EPROBE_DEFER;
mutex_lock(&client_mutex);
list_for_each_entry(pos, &component_list, list) {
component_of_node = pos->dev->of_node;
if (!component_of_node && pos->dev->parent)
component_of_node = pos->dev->parent->of_node;
if (component_of_node != args->np)
continue;
if (pos->driver->of_xlate_dai_name) {
ret = pos->driver->of_xlate_dai_name(pos,
args,
dai_name);
} else {
int id = -1;
switch (args->args_count) {
case 0:
id = 0; /* same as dai_drv[0] */
break;
case 1:
id = args->args[0];
break;
default:
/* not supported */
break;
}
if (id < 0 || id >= pos->num_dai) {
ret = -EINVAL;
continue;
}
ret = 0;
*dai_name = pos->dai_drv[id].name;
if (!*dai_name)
*dai_name = pos->name;
}
break;
}
mutex_unlock(&client_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_get_dai_name);
int snd_soc_of_get_dai_name(struct device_node *of_node,
const char **dai_name)
{
struct of_phandle_args args;
int ret;
ret = of_parse_phandle_with_args(of_node, "sound-dai",
"#sound-dai-cells", 0, &args);
if (ret)
return ret;
ret = snd_soc_get_dai_name(&args, dai_name);
of_node_put(args.np);
return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_of_get_dai_name);
/*
* snd_soc_of_get_dai_link_codecs - Parse a list of CODECs in the devicetree
* @dev: Card device
* @of_node: Device node
* @dai_link: DAI link
*
* Builds an array of CODEC DAI components from the DAI link property
* 'sound-dai'.
* The array is set in the DAI link and the number of DAIs is set accordingly.
* The device nodes in the array (of_node) must be dereferenced by the caller.
*
* Returns 0 for success
*/
int snd_soc_of_get_dai_link_codecs(struct device *dev,
struct device_node *of_node,
struct snd_soc_dai_link *dai_link)
{
struct of_phandle_args args;
struct snd_soc_dai_link_component *component;
char *name;
int index, num_codecs, ret;
/* Count the number of CODECs */
name = "sound-dai";
num_codecs = of_count_phandle_with_args(of_node, name,
"#sound-dai-cells");
if (num_codecs <= 0) {
if (num_codecs == -ENOENT)
dev_err(dev, "No 'sound-dai' property\n");
else
dev_err(dev, "Bad phandle in 'sound-dai'\n");
return num_codecs;
}
component = devm_kzalloc(dev,
sizeof *component * num_codecs,
GFP_KERNEL);
if (!component)
return -ENOMEM;
dai_link->codecs = component;
dai_link->num_codecs = num_codecs;
/* Parse the list */
for (index = 0, component = dai_link->codecs;
index < dai_link->num_codecs;
index++, component++) {
ret = of_parse_phandle_with_args(of_node, name,
"#sound-dai-cells",
index, &args);
if (ret)
goto err;
component->of_node = args.np;
ret = snd_soc_get_dai_name(&args, &component->dai_name);
if (ret < 0)
goto err;
}
return 0;
err:
for (index = 0, component = dai_link->codecs;
index < dai_link->num_codecs;
index++, component++) {
if (!component->of_node)
break;
of_node_put(component->of_node);
component->of_node = NULL;
}
dai_link->codecs = NULL;
dai_link->num_codecs = 0;
return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_of_get_dai_link_codecs);
static int __init snd_soc_init(void)
{
snd_soc_debugfs_init();
snd_soc_util_init();
return platform_driver_register(&soc_driver);
}
module_init(snd_soc_init);
static void __exit snd_soc_exit(void)
{
snd_soc_util_exit();
snd_soc_debugfs_exit();
platform_driver_unregister(&soc_driver);
}
module_exit(snd_soc_exit);
/* Module information */
MODULE_AUTHOR("Liam Girdwood, lrg@slimlogic.co.uk");
MODULE_DESCRIPTION("ALSA SoC Core");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:soc-audio");
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