Commit d64cb71b authored by Jaewon Kim's avatar Jaewon Kim Committed by Dmitry Torokhov

Input: add regulator haptic driver

This change adds support for haptic driver controlled by voltage of a
regulator. Userspace can control the device via Force Feedback interface
from input framework.
Signed-off-by: default avatarJaewon Kim <jaewon02.kim@samsung.com>
Signed-off-by: default avatarHyunhee Kim <hyunhee.kim@samsung.com>
Acked-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Tested-by: default avatarChanwoo Choi <cw00.choi@samsung.com>
Reviewed-by: default avatarChanwoo Choi <cw00.choi@samsung.com>
Reviewed-by: default avatarPankaj Dubey <pankaj.dubey@samsung.com>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 27a560ba
* Regulator Haptic Device Tree Bindings
Required Properties:
- compatible : Should be "regulator-haptic"
- haptic-supply : Power supply to the haptic motor.
[*] refer Documentation/devicetree/bindings/regulator/regulator.txt
- max-microvolt : The maximum voltage value supplied to the haptic motor.
[The unit of the voltage is a micro]
- min-microvolt : The minimum voltage value supplied to the haptic motor.
[The unit of the voltage is a micro]
Example:
haptics {
compatible = "regulator-haptic";
haptic-supply = <&motor_regulator>;
max-microvolt = <2700000>;
min-microvolt = <1100000>;
};
......@@ -394,6 +394,18 @@ config INPUT_CM109
To compile this driver as a module, choose M here: the module will be
called cm109.
config INPUT_REGULATOR_HAPTIC
tristate "Regulator haptics support"
depends on REGULATOR
select INPUT_FF_MEMLESS
help
This option enables device driver support for the haptic controlled
by a regulator. This driver supports ff-memless interface
from input framework.
To compile this driver as a module, choose M here: the
module will be called regulator-haptic.
config INPUT_RETU_PWRBUTTON
tristate "Retu Power button Driver"
depends on MFD_RETU
......
......@@ -53,6 +53,7 @@ obj-$(CONFIG_INPUT_PMIC8XXX_PWRKEY) += pmic8xxx-pwrkey.o
obj-$(CONFIG_INPUT_POWERMATE) += powermate.o
obj-$(CONFIG_INPUT_PWM_BEEPER) += pwm-beeper.o
obj-$(CONFIG_INPUT_RB532_BUTTON) += rb532_button.o
obj-$(CONFIG_INPUT_REGULATOR_HAPTIC) += regulator-haptic.o
obj-$(CONFIG_INPUT_RETU_PWRBUTTON) += retu-pwrbutton.o
obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER) += rotary_encoder.o
obj-$(CONFIG_INPUT_SGI_BTNS) += sgi_btns.o
......
/*
* 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;
}
return 0;
}
static void regulator_haptic_work(struct work_struct *work)
{
struct regulator_haptic *haptic = container_of(work,
struct regulator_haptic, work);
unsigned int magnitude;
int error;
mutex_lock(&haptic->mutex);
if (haptic->suspended)
goto out;
magnitude = ACCESS_ONCE(haptic->magnitude);
error = regulator_haptic_set_voltage(haptic, magnitude);
if (error)
goto out;
regulator_haptic_toggle(haptic, magnitude != 0);
out:
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);
regulator_haptic_toggle(haptic, false);
}
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 dveice 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);
regulator_haptic_toggle(haptic, false);
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);
regulator_haptic_toggle(haptic, true);
}
mutex_unlock(&haptic->mutex);
return 0;
}
static SIMPLE_DEV_PM_OPS(regulator_haptic_pm_ops,
regulator_haptic_suspend, regulator_haptic_resume);
static struct of_device_id regulator_haptic_dt_match[] = {
{ .compatible = "regulator-haptic" },
{ /* sentinel */ },
};
static struct platform_driver regulator_haptic_driver = {
.probe = regulator_haptic_probe,
.driver = {
.name = "regulator-haptic",
.of_match_table = regulator_haptic_dt_match,
.pm = &regulator_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");
/*
* Regulator Haptic Platform Data
*
* 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.
*/
#ifndef _REGULATOR_HAPTIC_H
#define _REGULATOR_HAPTIC_H
/*
* struct regulator_haptic_data - Platform device data
*
* @max_volt: maximum voltage value supplied to the haptic motor.
* <The unit of the voltage is a micro>
* @min_volt: minimum voltage value supplied to the haptic motor.
* <The unit of the voltage is a micro>
*/
struct regulator_haptic_data {
unsigned int max_volt;
unsigned int min_volt;
};
#endif /* _REGULATOR_HAPTIC_H */
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