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/* arch/arm/mach-s5pv210/herring-vibrator.c
*
* Copyright (C) 2010 Samsung Electronics Co. Ltd. All Rights Reserved.
* Author: Rom Lemarchand <rlemarchand@sta.samsung.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*/
#include <linux/hrtimer.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/pwm.h>
#include <linux/wakelock.h>
#include <linux/mutex.h>
#include <linux/clk.h>
#include <linux/workqueue.h>
#include <asm/mach-types.h>
#include <../../../drivers/staging/android/timed_output.h>
#include <mach/gpio-herring.h>
#define GPD0_TOUT_1 2 << 4
#define PWM_PERIOD (89284 / 2)
#define PWM_DUTY (87280 / 2)
#define MAX_TIMEOUT 10000 /* 10s */
static struct vibrator {
struct wake_lock wklock;
struct pwm_device *pwm_dev;
struct hrtimer timer;
struct mutex lock;
struct work_struct work;
} vibdata;
static void herring_vibrator_off(void)
{
pwm_disable(vibdata.pwm_dev);
gpio_direction_output(GPIO_VIBTONE_EN1, GPIO_LEVEL_LOW);
wake_unlock(&vibdata.wklock);
}
static int herring_vibrator_get_time(struct timed_output_dev *dev)
{
if (hrtimer_active(&vibdata.timer)) {
ktime_t r = hrtimer_get_remaining(&vibdata.timer);
return ktime_to_ms(r);
}
return 0;
}
static void herring_vibrator_enable(struct timed_output_dev *dev, int value)
{
mutex_lock(&vibdata.lock);
/* cancel previous timer and set GPIO according to value */
hrtimer_cancel(&vibdata.timer);
cancel_work_sync(&vibdata.work);
if (value) {
wake_lock(&vibdata.wklock);
pwm_config(vibdata.pwm_dev, PWM_DUTY, PWM_PERIOD);
pwm_enable(vibdata.pwm_dev);
gpio_direction_output(GPIO_VIBTONE_EN1, GPIO_LEVEL_HIGH);
if (value > 0) {
if (value > MAX_TIMEOUT)
value = MAX_TIMEOUT;
hrtimer_start(&vibdata.timer,
ns_to_ktime((u64)value * NSEC_PER_MSEC),
HRTIMER_MODE_REL);
}
} else
herring_vibrator_off();
mutex_unlock(&vibdata.lock);
}
static struct timed_output_dev to_dev = {
.name = "vibrator",
.get_time = herring_vibrator_get_time,
.enable = herring_vibrator_enable,
};
static enum hrtimer_restart herring_vibrator_timer_func(struct hrtimer *timer)
{
schedule_work(&vibdata.work);
return HRTIMER_NORESTART;
}
static void herring_vibrator_work(struct work_struct *work)
{
herring_vibrator_off();
}
static int __init herring_init_vibrator(void)
{
int ret = 0;
#ifdef CONFIG_MACH_HERRING
if (!machine_is_herring())
return 0;
#endif
hrtimer_init(&vibdata.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
vibdata.timer.function = herring_vibrator_timer_func;
INIT_WORK(&vibdata.work, herring_vibrator_work);
ret = gpio_request(GPIO_VIBTONE_EN1, "vibrator-en");
if (ret < 0)
return ret;
s3c_gpio_cfgpin(GPIO_VIBTONE_PWM, GPD0_TOUT_1);
vibdata.pwm_dev = pwm_request(1, "vibrator-pwm");
if (IS_ERR(vibdata.pwm_dev)) {
ret = PTR_ERR(vibdata.pwm_dev);
goto err_pwm_req;
}
wake_lock_init(&vibdata.wklock, WAKE_LOCK_SUSPEND, "vibrator");
mutex_init(&vibdata.lock);
ret = timed_output_dev_register(&to_dev);
if (ret < 0)
goto err_to_dev_reg;
return 0;
err_to_dev_reg:
mutex_destroy(&vibdata.lock);
wake_lock_destroy(&vibdata.wklock);
pwm_free(vibdata.pwm_dev);
err_pwm_req:
gpio_free(GPIO_VIBTONE_EN1);
return ret;
}
device_initcall(herring_init_vibrator);
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