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/*
* Power consumption test module
*
* Author: Dmitrij Frasenyak <sed@embeddedalley.com>
*
* Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/sched.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
static struct regulator *reg;
static struct regulator *freg;
static struct timer_list pt_timer;
static int timer_delay = 5*60*1000; /* 5min */
static DEFINE_MUTEX(run_mutex);
#define REG_GET() do {\
if (!reg) {\
reg = regulator_get(NULL, "power-test-1");\
if (!reg || IS_ERR(reg)) {\
reg = NULL ; return -ENODEV;\
} \
} \
} while (0);
static void timer_func(unsigned long data)
{
regulator_set_current_limit(reg, 0, 0);
mutex_unlock(&run_mutex);
}
static ssize_t pt_mode_set(struct device *d, struct device_attribute *attr,
const char *buf, size_t size)
{
REG_GET();
if (buf[0] == 'f')
regulator_set_mode(reg, REGULATOR_MODE_FAST);
else
regulator_set_mode(reg, REGULATOR_MODE_NORMAL);
return size;
}
static ssize_t pt_mode_show(struct device *d, struct device_attribute *attr,
char *buf)
{
REG_GET();
if (regulator_get_mode(reg) == REGULATOR_MODE_FAST)
return snprintf(buf, 5, "fast\n");
else
return snprintf(buf, 7, "normal\n");
}
static ssize_t pt_val_fset(struct device *d, struct device_attribute *attr,
const char *buf, size_t size)
{
int i, ret;
ret = sscanf(buf, "%u", &i);
if (ret != 1)
return -EINVAL;
if (!freg) {
freg = regulator_get(NULL, "stmp3xxx-bl-1");
if (!freg || IS_ERR(freg)) {
freg = NULL ; return -ENODEV;
}
}
regulator_set_mode(freg, REGULATOR_MODE_NORMAL);
if (!regulator_set_current_limit(freg, i, i))
printk(KERN_ERR "got backlight reg\n");
else
printk(KERN_ERR "failed to get backlight reg");
return size;
}
static ssize_t pt_val_set(struct device *d, struct device_attribute *attr,
const char *buf, size_t size)
{
int i, ret;
REG_GET();
ret = sscanf(buf, "%u", &i);
if (ret != 1)
return -EINVAL;
mutex_lock(&run_mutex);
if (!regulator_set_current_limit(reg, i, i)) {
mod_timer(&pt_timer,
jiffies + msecs_to_jiffies(timer_delay));
return size;
} else {
mutex_unlock(&run_mutex);
return -EPERM;
}
}
static ssize_t pt_val_show(struct device *d, struct device_attribute *attr,
char *buf)
{
REG_GET();
return sprintf(buf, "%d\n", regulator_get_current_limit(reg));
}
static ssize_t pt_timeout_set(struct device *d, struct device_attribute *attr,
const char *buf, size_t size)
{
int i, ret;
REG_GET();
ret = sscanf(buf, "%u", &i);
if (ret != 1)
return -EINVAL;
mutex_lock(&run_mutex);
timer_delay = 1000*i ;
mutex_unlock(&run_mutex);
return size;
}
static ssize_t pt_timeout_show(struct device *d, struct device_attribute *attr,
char *buf)
{
REG_GET();
return sprintf(buf, "%d\n", timer_delay);
}
static DEVICE_ATTR(mode, 0644, pt_mode_show, pt_mode_set);
static DEVICE_ATTR(val, 0644, pt_val_show, pt_val_set);
static DEVICE_ATTR(fval, 0644, pt_val_show, pt_val_fset);
static DEVICE_ATTR(timeout, 0644, pt_timeout_show, pt_timeout_set);
static int stmp3xxx_power_test_remove(struct platform_device *pdev)
{
if (reg)
regulator_put(reg);
device_remove_file(&pdev->dev, &dev_attr_mode);
device_remove_file(&pdev->dev, &dev_attr_val);
device_remove_file(&pdev->dev, &dev_attr_timeout);
device_remove_file(&pdev->dev, &dev_attr_fval);
return 0;
}
static int stmp3xxx_power_test_probe(struct platform_device *pdev)
{
init_timer(&pt_timer);
pt_timer.data = 0;
pt_timer.function = timer_func;
device_create_file(&pdev->dev, &dev_attr_mode);
device_create_file(&pdev->dev, &dev_attr_val);
device_create_file(&pdev->dev, &dev_attr_fval);
device_create_file(&pdev->dev, &dev_attr_timeout);
return 0;
}
static struct platform_driver stmp3xxx_power_test_driver = {
.probe = stmp3xxx_power_test_probe,
.remove = stmp3xxx_power_test_remove,
.driver = {
.name = "stmp3xxx-power-test",
.owner = THIS_MODULE,
},
};
struct platform_device stmp3xxx_pt = {
.name = "stmp3xxx-power-test",
.id = -1,
};
static int __init stmp3xxx_power_test_init(void)
{
platform_device_register(&stmp3xxx_pt);
return platform_driver_register(&stmp3xxx_power_test_driver);
}
static void __exit stmp3xxx_power_test_exit(void)
{
platform_driver_unregister(&stmp3xxx_power_test_driver);
platform_device_unregister(&stmp3xxx_pt);
}
MODULE_AUTHOR("<sed@embeddedalley.com>");
MODULE_DESCRIPTION("Power test driver");
MODULE_LICENSE("GPL");
module_init(stmp3xxx_power_test_init);
module_exit(stmp3xxx_power_test_exit);
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