268 строки
6.5 KiB
C
268 строки
6.5 KiB
C
/*
|
|
* Regulator haptic driver
|
|
*
|
|
* Copyright (c) 2014 Samsung Electronics Co., Ltd.
|
|
* Author: Jaewon Kim <jaewon02.kim@samsung.com>
|
|
* Author: Hyunhee Kim <hyunhee.kim@samsung.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/input.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/platform_data/regulator-haptic.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regulator/consumer.h>
|
|
#include <linux/slab.h>
|
|
|
|
#define MAX_MAGNITUDE_SHIFT 16
|
|
|
|
struct regulator_haptic {
|
|
struct device *dev;
|
|
struct input_dev *input_dev;
|
|
struct regulator *regulator;
|
|
|
|
struct work_struct work;
|
|
struct mutex mutex;
|
|
|
|
bool active;
|
|
bool suspended;
|
|
|
|
unsigned int max_volt;
|
|
unsigned int min_volt;
|
|
unsigned int magnitude;
|
|
};
|
|
|
|
static int regulator_haptic_toggle(struct regulator_haptic *haptic, bool on)
|
|
{
|
|
int error;
|
|
|
|
if (haptic->active != on) {
|
|
|
|
error = on ? regulator_enable(haptic->regulator) :
|
|
regulator_disable(haptic->regulator);
|
|
if (error) {
|
|
dev_err(haptic->dev,
|
|
"failed to switch regulator %s: %d\n",
|
|
on ? "on" : "off", error);
|
|
return error;
|
|
}
|
|
|
|
haptic->active = on;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int regulator_haptic_set_voltage(struct regulator_haptic *haptic,
|
|
unsigned int magnitude)
|
|
{
|
|
u64 volt_mag_multi;
|
|
unsigned int intensity;
|
|
int error;
|
|
|
|
volt_mag_multi = (u64)(haptic->max_volt - haptic->min_volt) * magnitude;
|
|
intensity = (unsigned int)(volt_mag_multi >> MAX_MAGNITUDE_SHIFT);
|
|
|
|
error = regulator_set_voltage(haptic->regulator,
|
|
intensity + haptic->min_volt,
|
|
haptic->max_volt);
|
|
if (error) {
|
|
dev_err(haptic->dev, "cannot set regulator voltage to %d: %d\n",
|
|
intensity + haptic->min_volt, error);
|
|
return error;
|
|
}
|
|
|
|
regulator_haptic_toggle(haptic, !!magnitude);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void regulator_haptic_work(struct work_struct *work)
|
|
{
|
|
struct regulator_haptic *haptic = container_of(work,
|
|
struct regulator_haptic, work);
|
|
|
|
mutex_lock(&haptic->mutex);
|
|
|
|
if (!haptic->suspended)
|
|
regulator_haptic_set_voltage(haptic, haptic->magnitude);
|
|
|
|
mutex_unlock(&haptic->mutex);
|
|
}
|
|
|
|
static int regulator_haptic_play_effect(struct input_dev *input, void *data,
|
|
struct ff_effect *effect)
|
|
{
|
|
struct regulator_haptic *haptic = input_get_drvdata(input);
|
|
|
|
haptic->magnitude = effect->u.rumble.strong_magnitude;
|
|
if (!haptic->magnitude)
|
|
haptic->magnitude = effect->u.rumble.weak_magnitude;
|
|
|
|
schedule_work(&haptic->work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void regulator_haptic_close(struct input_dev *input)
|
|
{
|
|
struct regulator_haptic *haptic = input_get_drvdata(input);
|
|
|
|
cancel_work_sync(&haptic->work);
|
|
regulator_haptic_set_voltage(haptic, 0);
|
|
}
|
|
|
|
static int __maybe_unused
|
|
regulator_haptic_parse_dt(struct device *dev, struct regulator_haptic *haptic)
|
|
{
|
|
struct device_node *node;
|
|
int error;
|
|
|
|
node = dev->of_node;
|
|
if(!node) {
|
|
dev_err(dev, "Missing device tree data\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
error = of_property_read_u32(node, "max-microvolt", &haptic->max_volt);
|
|
if (error) {
|
|
dev_err(dev, "cannot parse max-microvolt\n");
|
|
return error;
|
|
}
|
|
|
|
error = of_property_read_u32(node, "min-microvolt", &haptic->min_volt);
|
|
if (error) {
|
|
dev_err(dev, "cannot parse min-microvolt\n");
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int regulator_haptic_probe(struct platform_device *pdev)
|
|
{
|
|
const struct regulator_haptic_data *pdata = dev_get_platdata(&pdev->dev);
|
|
struct regulator_haptic *haptic;
|
|
struct input_dev *input_dev;
|
|
int error;
|
|
|
|
haptic = devm_kzalloc(&pdev->dev, sizeof(*haptic), GFP_KERNEL);
|
|
if (!haptic)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(pdev, haptic);
|
|
haptic->dev = &pdev->dev;
|
|
mutex_init(&haptic->mutex);
|
|
INIT_WORK(&haptic->work, regulator_haptic_work);
|
|
|
|
if (pdata) {
|
|
haptic->max_volt = pdata->max_volt;
|
|
haptic->min_volt = pdata->min_volt;
|
|
} else if (IS_ENABLED(CONFIG_OF)) {
|
|
error = regulator_haptic_parse_dt(&pdev->dev, haptic);
|
|
if (error)
|
|
return error;
|
|
} else {
|
|
dev_err(&pdev->dev, "Missing platform data\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
haptic->regulator = devm_regulator_get_exclusive(&pdev->dev, "haptic");
|
|
if (IS_ERR(haptic->regulator)) {
|
|
dev_err(&pdev->dev, "failed to get regulator\n");
|
|
return PTR_ERR(haptic->regulator);
|
|
}
|
|
|
|
input_dev = devm_input_allocate_device(&pdev->dev);
|
|
if (!input_dev)
|
|
return -ENOMEM;
|
|
|
|
haptic->input_dev = input_dev;
|
|
haptic->input_dev->name = "regulator-haptic";
|
|
haptic->input_dev->dev.parent = &pdev->dev;
|
|
haptic->input_dev->close = regulator_haptic_close;
|
|
input_set_drvdata(haptic->input_dev, haptic);
|
|
input_set_capability(haptic->input_dev, EV_FF, FF_RUMBLE);
|
|
|
|
error = input_ff_create_memless(input_dev, NULL,
|
|
regulator_haptic_play_effect);
|
|
if (error) {
|
|
dev_err(&pdev->dev, "failed to create force-feedback\n");
|
|
return error;
|
|
}
|
|
|
|
error = input_register_device(haptic->input_dev);
|
|
if (error) {
|
|
dev_err(&pdev->dev, "failed to register input device\n");
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused regulator_haptic_suspend(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct regulator_haptic *haptic = platform_get_drvdata(pdev);
|
|
int error;
|
|
|
|
error = mutex_lock_interruptible(&haptic->mutex);
|
|
if (error)
|
|
return error;
|
|
|
|
regulator_haptic_set_voltage(haptic, 0);
|
|
|
|
haptic->suspended = true;
|
|
|
|
mutex_unlock(&haptic->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused regulator_haptic_resume(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct regulator_haptic *haptic = platform_get_drvdata(pdev);
|
|
unsigned int magnitude;
|
|
|
|
mutex_lock(&haptic->mutex);
|
|
|
|
haptic->suspended = false;
|
|
|
|
magnitude = ACCESS_ONCE(haptic->magnitude);
|
|
if (magnitude)
|
|
regulator_haptic_set_voltage(haptic, magnitude);
|
|
|
|
mutex_unlock(&haptic->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(regulator_haptic_pm_ops,
|
|
regulator_haptic_suspend, regulator_haptic_resume);
|
|
|
|
static const struct of_device_id regulator_haptic_dt_match[] = {
|
|
{ .compatible = "regulator-haptic" },
|
|
{ /* sentinel */ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, regulator_haptic_dt_match);
|
|
|
|
static struct platform_driver regulator_haptic_driver = {
|
|
.probe = regulator_haptic_probe,
|
|
.driver = {
|
|
.name = "regulator-haptic",
|
|
.of_match_table = regulator_haptic_dt_match,
|
|
.pm = ®ulator_haptic_pm_ops,
|
|
},
|
|
};
|
|
module_platform_driver(regulator_haptic_driver);
|
|
|
|
MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
|
|
MODULE_AUTHOR("Hyunhee Kim <hyunhee.kim@samsung.com>");
|
|
MODULE_DESCRIPTION("Regulator haptic driver");
|
|
MODULE_LICENSE("GPL");
|