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/*
* drivers/misc/max1749.c
*
* Driver for MAX1749, vibrator motor driver.
*
* Copyright (c) 2011-2013 NVIDIA Corporation, All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/module.h>
#include <linux/regulator/consumer.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/hrtimer.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include "../staging/android/timed_output.h"
struct vibrator_data {
struct timed_output_dev dev;
struct hrtimer timer;
struct regulator *regulator;
struct work_struct work;
bool vibrator_on;
};
static struct vibrator_data *data;
static void vibrator_start(void)
{
if (!data->vibrator_on) {
regulator_enable(data->regulator);
data->vibrator_on = true;
}
}
static void vibrator_stop(void)
{
int ret;
if (data->vibrator_on) {
ret = regulator_is_enabled(data->regulator);
if (ret > 0) {
regulator_disable(data->regulator);
data->vibrator_on = false;
}
}
}
static void vibrator_work_func(struct work_struct *work)
{
vibrator_stop();
}
static enum hrtimer_restart vibrator_timer_func(struct hrtimer *timer)
{
schedule_work(&data->work);
return HRTIMER_NORESTART;
}
/*
* Timeout value can be changed from sysfs entry
* created by timed_output_dev.
* echo 100 > /sys/class/timed_output/vibrator/enable
*/
static void vibrator_enable(struct timed_output_dev *dev, int value)
{
hrtimer_cancel(&data->timer);
if (value > 0) {
vibrator_start();
hrtimer_start(&data->timer,
ktime_set(value / 1000, (value % 1000) * 1000000),
HRTIMER_MODE_REL);
} else
vibrator_stop();
return;
}
static int vibrator_get_time(struct timed_output_dev *dev)
{
if (hrtimer_active(&data->timer)) {
ktime_t r = hrtimer_get_remaining(&data->timer);
struct timeval t = ktime_to_timeval(r);
return t.tv_sec * 1000 + t.tv_usec / 1000;
} else
return 0;
}
static struct timed_output_dev vibrator_dev = {
.name = "vibrator",
.get_time = vibrator_get_time,
.enable = vibrator_enable,
};
static int vibrator_probe(struct platform_device *pdev)
{
int ret;
data = kzalloc(sizeof(struct vibrator_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->regulator = regulator_get(NULL, "vdd_vbrtr");
if (IS_ERR_OR_NULL(data->regulator)) {
pr_err("vibrator_init:Couldn't get regulator vdd_vbrtr\n");
data->regulator = NULL;
ret = PTR_ERR(data->regulator);
goto err;
}
hrtimer_init(&data->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
/* Intialize the work queue */
INIT_WORK(&data->work, vibrator_work_func);
data->timer.function = vibrator_timer_func;
data->dev = vibrator_dev;
data->vibrator_on = false;
ret = timed_output_dev_register(&data->dev);
if (ret)
goto err2;
return 0;
err2:
regulator_put(data->regulator);
err:
kfree(data);
return ret;
}
static int vibrator_remove(struct platform_device *pdev)
{
timed_output_dev_unregister(&data->dev);
regulator_put(data->regulator);
kfree(data);
return 0;
}
static struct platform_driver vibrator_driver = {
.probe = vibrator_probe,
.remove = vibrator_remove,
.driver = {
.name = "tegra-vibrator",
.owner = THIS_MODULE,
},
};
static int __init vibrator_init(void)
{
return platform_driver_register(&vibrator_driver);
}
static void __exit vibrator_exit(void)
{
platform_driver_unregister(&vibrator_driver);
}
MODULE_DESCRIPTION("timed output vibrator device");
MODULE_AUTHOR("GPL");
module_init(vibrator_init);
module_exit(vibrator_exit);
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