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/* drivers/misc/bld.c
*
* Copyright 2011 Ezekeel
*
* 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/bld.h>
#include <linux/workqueue.h>
#include <linux/earlysuspend.h>
#include <linux/mutex.h>
static bool bld_enabled = false;
static bool backlight_dimmed = false;
static bool device_suspended = false;
static unsigned int dimmer_delay = 5000;
static void bld_toggle_backlights(struct work_struct * dimmer_work);
static DECLARE_DELAYED_WORK(dimmer_work, bld_toggle_backlights);
static DEFINE_MUTEX(lock);
static struct bld_implementation * bld_imp = NULL;
#define BACKLIGHTDIMMER_VERSION 3
static void bld_early_suspend(struct early_suspend * h)
{
device_suspended = true;
cancel_delayed_work(&dimmer_work);
flush_scheduled_work();
return;
}
static void bld_late_resume(struct early_suspend * h)
{
device_suspended = false;
backlight_dimmed = false;
touchkey_pressed();
return;
}
static struct early_suspend bld_suspend_data =
{
.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN + 1,
.suspend = bld_early_suspend,
.resume = bld_late_resume,
};
static void bld_disable_backlights(void)
{
if (bld_imp)
{
bld_imp->disable();
}
backlight_dimmed = true;
mutex_unlock(&lock);
return;
}
static void bld_enable_backlights(void)
{
if (bld_imp)
{
bld_imp->enable();
}
backlight_dimmed = false;
mutex_unlock(&lock);
touchkey_pressed();
return;
}
static void bld_toggle_backlights(struct work_struct * dimmer_work)
{
if (backlight_dimmed)
{
bld_enable_backlights();
}
else
{
if (mutex_trylock(&lock))
{
bld_disable_backlights();
}
}
return;
}
static ssize_t backlightdimmer_status_read(struct device * dev, struct device_attribute * attr, char * buf)
{
return sprintf(buf, "%u\n", (bld_enabled ? 1 : 0));
}
static ssize_t backlightdimmer_status_write(struct device * dev, struct device_attribute * attr, const char * buf, size_t size)
{
unsigned int data;
if(sscanf(buf, "%u\n", &data) == 1)
{
pr_devel("%s: %u \n", __FUNCTION__, data);
if (data == 1)
{
pr_info("%s: BLD function enabled\n", __FUNCTION__);
bld_enabled = true;
touchkey_pressed();
}
else if (data == 0)
{
pr_info("%s: BLD function disabled\n", __FUNCTION__);
bld_enabled = false;
cancel_delayed_work(&dimmer_work);
flush_scheduled_work();
if (backlight_dimmed)
{
bld_enable_backlights();
}
}
else
{
pr_info("%s: invalid input range %u\n", __FUNCTION__, data);
}
}
else
{
pr_info("%s: invalid input\n", __FUNCTION__);
}
return size;
}
static ssize_t backlightdimmer_delay_read(struct device * dev, struct device_attribute * attr, char * buf)
{
return sprintf(buf, "%u\n", dimmer_delay);
}
static ssize_t backlightdimmer_delay_write(struct device * dev, struct device_attribute * attr, const char * buf, size_t size)
{
unsigned int data;
if(sscanf(buf, "%u\n", &data) == 1)
{
dimmer_delay = data;
pr_info("BLD delay set to %u\n", dimmer_delay);
touchkey_pressed();
}
else
{
pr_info("%s: invalid input\n", __FUNCTION__);
}
return size;
}
static ssize_t backlightdimmer_version(struct device * dev, struct device_attribute * attr, char * buf)
{
return sprintf(buf, "%u\n", BACKLIGHTDIMMER_VERSION);
}
static DEVICE_ATTR(enabled, S_IRUGO | S_IWUGO, backlightdimmer_status_read, backlightdimmer_status_write);
static DEVICE_ATTR(delay, S_IRUGO | S_IWUGO, backlightdimmer_delay_read, backlightdimmer_delay_write);
static DEVICE_ATTR(version, S_IRUGO , backlightdimmer_version, NULL);
static struct attribute *bld_notification_attributes[] =
{
&dev_attr_enabled.attr,
&dev_attr_delay.attr,
&dev_attr_version.attr,
NULL
};
static struct attribute_group bld_notification_group =
{
.attrs = bld_notification_attributes,
};
static struct miscdevice bld_device =
{
.minor = MISC_DYNAMIC_MINOR,
.name = "backlightdimmer",
};
void touchkey_pressed(void)
{
if (!device_suspended && bld_enabled)
{
if (backlight_dimmed)
{
if (mutex_trylock(&lock))
{
cancel_delayed_work(&dimmer_work);
schedule_delayed_work(&dimmer_work, 0);
}
}
else
{
if (!mutex_is_locked(&lock))
{
cancel_delayed_work(&dimmer_work);
schedule_delayed_work(&dimmer_work, msecs_to_jiffies(dimmer_delay));
}
}
}
return;
}
EXPORT_SYMBOL(touchkey_pressed);
void register_bld_implementation(struct bld_implementation * imp)
{
bld_imp = imp;
return;
}
EXPORT_SYMBOL(register_bld_implementation);
static int __init bld_control_init(void)
{
int ret;
pr_info("%s misc_register(%s)\n", __FUNCTION__, bld_device.name);
ret = misc_register(&bld_device);
if (ret)
{
pr_err("%s misc_register(%s) fail\n", __FUNCTION__, bld_device.name);
return 1;
}
if (sysfs_create_group(&bld_device.this_device->kobj, &bld_notification_group) < 0)
{
pr_err("%s sysfs_create_group fail\n", __FUNCTION__);
pr_err("Failed to create sysfs group for device (%s)!\n", bld_device.name);
}
register_early_suspend(&bld_suspend_data);
return 0;
}
device_initcall(bld_control_init);
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