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/*
* Copyright 2013-2014 Francisco Franco
* franciscofranco.1990@gmail.com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/init.h>
#include <linux/device.h>
#include <linux/miscdevice.h>
#include <linux/sound_control.h>
#define MAX_VALUE 20
/*
* Volume boost value
*/
unsigned int headphones_boost = 0;
/*
* Headset boost value
*/
unsigned int headset_boost = 0;
/*
* Speaker boost value
*/
unsigned int speaker_boost = 0;
/*
* Mic boost value
*/
unsigned int mic_boost = 0;
/*
* Sysfs get/set entries
*/
static ssize_t headphones_boost_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", headphones_boost);
}
static ssize_t headphones_boost_store(struct device * dev,
struct device_attribute * attr, const char * buf, size_t size)
{
int ret;
unsigned long val;
ret = kstrtoul(buf, 0, &val);
if (ret < 0)
return ret;
headphones_boost = val > MAX_VALUE ? MAX_VALUE : val;
update_headphones_volume_boost(headphones_boost);
pr_info("%s: %d\n", __func__, headphones_boost);
return size;
}
static ssize_t headset_boost_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", headset_boost);
}
static ssize_t headset_boost_store(struct device * dev,
struct device_attribute * attr, const char * buf, size_t size)
{
int ret;
unsigned long val;
ret = kstrtoul(buf, 0, &val);
if (ret < 0)
return ret;
headset_boost = val > MAX_VALUE ? MAX_VALUE : val;
update_headset_boost(headphones_boost);
pr_info("%s: %d\n", __func__, headset_boost);
return size;
}
static ssize_t speaker_boost_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", speaker_boost);
}
static ssize_t speaker_boost_store(struct device * dev,
struct device_attribute * attr, const char * buf, size_t size)
{
int ret;
unsigned long val;
ret = kstrtoul(buf, 0, &val);
if (ret < 0)
return ret;
speaker_boost = val > MAX_VALUE ? MAX_VALUE : val;
update_speaker_gain(speaker_boost);
pr_info("%s: %d\n", __func__, speaker_boost);
return size;
}
static ssize_t mic_boost_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", mic_boost);
}
static ssize_t mic_boost_store(struct device * dev,
struct device_attribute * attr, const char * buf, size_t size)
{
int ret;
unsigned long val;
ret = kstrtoul(buf, 0, &val);
if (ret < 0)
return ret;
mic_boost = val > MAX_VALUE ? MAX_VALUE : val;
update_mic_gain(mic_boost);
pr_info("%s: %d\n", __func__, mic_boost);
return size;
}
static DEVICE_ATTR(volume_boost, 0664, headphones_boost_show,
headphones_boost_store);
static DEVICE_ATTR(headset_boost, 0664, headset_boost_show,
headset_boost_store);
static DEVICE_ATTR(speaker_boost, 0664, speaker_boost_show,
speaker_boost_store);
static DEVICE_ATTR(mic_boost, 0664, mic_boost_show, mic_boost_store);
static struct attribute *soundcontrol_attributes[] =
{
&dev_attr_volume_boost.attr,
&dev_attr_headset_boost.attr,
&dev_attr_speaker_boost.attr,
&dev_attr_mic_boost.attr,
NULL
};
static struct attribute_group soundcontrol_group =
{
.attrs = soundcontrol_attributes,
};
static struct miscdevice soundcontrol_device =
{
.minor = MISC_DYNAMIC_MINOR,
.name = "soundcontrol",
};
static void __exit soundcontrol_exit(void)
{
misc_deregister(&soundcontrol_device);
}
static int __init soundcontrol_init(void)
{
int ret;
pr_info("%s misc_register(%s)\n", __FUNCTION__, soundcontrol_device.name);
ret = misc_register(&soundcontrol_device);
if (ret) {
pr_err("%s misc_register(%s) fail\n", __FUNCTION__,
soundcontrol_device.name);
return 1;
}
if (sysfs_create_group(&soundcontrol_device.this_device->kobj,
&soundcontrol_group) < 0) {
pr_err("%s sysfs_create_group fail\n", __FUNCTION__);
pr_err("Failed to create sysfs group for device (%s)!\n",
soundcontrol_device.name);
}
return 0;
}
late_initcall(soundcontrol_init);
module_exit(soundcontrol_exit);
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