OpenCloudOS-Kernel/drivers/input/misc/max77843-haptic.c

360 lines
8.2 KiB
C

/*
* MAXIM MAX77693 Haptic device driver
*
* Copyright (C) 2015 Samsung Electronics
* Author: Jaewon Kim <jaewon02.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 as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/mfd/max77693-common.h>
#include <linux/mfd/max77843-private.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#define MAX_MAGNITUDE_SHIFT 16
enum max77843_haptic_motor_type {
MAX77843_HAPTIC_ERM = 0,
MAX77843_HAPTIC_LRA,
};
enum max77843_haptic_pwm_divisor {
MAX77843_HAPTIC_PWM_DIVISOR_32 = 0,
MAX77843_HAPTIC_PWM_DIVISOR_64,
MAX77843_HAPTIC_PWM_DIVISOR_128,
MAX77843_HAPTIC_PWM_DIVISOR_256,
};
struct max77843_haptic {
struct regmap *regmap_haptic;
struct device *dev;
struct input_dev *input_dev;
struct pwm_device *pwm_dev;
struct regulator *motor_reg;
struct work_struct work;
struct mutex mutex;
unsigned int magnitude;
unsigned int pwm_duty;
bool active;
bool suspended;
enum max77843_haptic_motor_type type;
enum max77843_haptic_pwm_divisor pwm_divisor;
};
static int max77843_haptic_set_duty_cycle(struct max77843_haptic *haptic)
{
int delta = (haptic->pwm_dev->period + haptic->pwm_duty) / 2;
int error;
error = pwm_config(haptic->pwm_dev, delta, haptic->pwm_dev->period);
if (error) {
dev_err(haptic->dev, "failed to configure pwm: %d\n", error);
return error;
}
return 0;
}
static int max77843_haptic_bias(struct max77843_haptic *haptic, bool on)
{
int error;
error = regmap_update_bits(haptic->regmap_haptic,
MAX77843_SYS_REG_MAINCTRL1,
MAX77843_MAINCTRL1_BIASEN_MASK,
on << MAINCTRL1_BIASEN_SHIFT);
if (error) {
dev_err(haptic->dev, "failed to %s bias: %d\n",
on ? "enable" : "disable", error);
return error;
}
return 0;
}
static int max77843_haptic_config(struct max77843_haptic *haptic, bool enable)
{
unsigned int value;
int error;
value = (haptic->type << MCONFIG_MODE_SHIFT) |
(enable << MCONFIG_MEN_SHIFT) |
(haptic->pwm_divisor << MCONFIG_PDIV_SHIFT);
error = regmap_write(haptic->regmap_haptic,
MAX77843_HAP_REG_MCONFIG, value);
if (error) {
dev_err(haptic->dev,
"failed to update haptic config: %d\n", error);
return error;
}
return 0;
}
static int max77843_haptic_enable(struct max77843_haptic *haptic)
{
int error;
if (haptic->active)
return 0;
error = pwm_enable(haptic->pwm_dev);
if (error) {
dev_err(haptic->dev,
"failed to enable pwm device: %d\n", error);
return error;
}
error = max77843_haptic_config(haptic, true);
if (error)
goto err_config;
haptic->active = true;
return 0;
err_config:
pwm_disable(haptic->pwm_dev);
return error;
}
static int max77843_haptic_disable(struct max77843_haptic *haptic)
{
int error;
if (!haptic->active)
return 0;
error = max77843_haptic_config(haptic, false);
if (error)
return error;
pwm_disable(haptic->pwm_dev);
haptic->active = false;
return 0;
}
static void max77843_haptic_play_work(struct work_struct *work)
{
struct max77843_haptic *haptic =
container_of(work, struct max77843_haptic, work);
int error;
mutex_lock(&haptic->mutex);
if (haptic->suspended)
goto out_unlock;
if (haptic->magnitude) {
error = max77843_haptic_set_duty_cycle(haptic);
if (error) {
dev_err(haptic->dev,
"failed to set duty cycle: %d\n", error);
goto out_unlock;
}
error = max77843_haptic_enable(haptic);
if (error)
dev_err(haptic->dev,
"cannot enable haptic: %d\n", error);
} else {
error = max77843_haptic_disable(haptic);
if (error)
dev_err(haptic->dev,
"cannot disable haptic: %d\n", error);
}
out_unlock:
mutex_unlock(&haptic->mutex);
}
static int max77843_haptic_play_effect(struct input_dev *dev, void *data,
struct ff_effect *effect)
{
struct max77843_haptic *haptic = input_get_drvdata(dev);
u64 period_mag_multi;
haptic->magnitude = effect->u.rumble.strong_magnitude;
if (!haptic->magnitude)
haptic->magnitude = effect->u.rumble.weak_magnitude;
period_mag_multi = (u64)haptic->pwm_dev->period * haptic->magnitude;
haptic->pwm_duty = (unsigned int)(period_mag_multi >>
MAX_MAGNITUDE_SHIFT);
schedule_work(&haptic->work);
return 0;
}
static int max77843_haptic_open(struct input_dev *dev)
{
struct max77843_haptic *haptic = input_get_drvdata(dev);
int error;
error = max77843_haptic_bias(haptic, true);
if (error)
return error;
error = regulator_enable(haptic->motor_reg);
if (error) {
dev_err(haptic->dev,
"failed to enable regulator: %d\n", error);
return error;
}
return 0;
}
static void max77843_haptic_close(struct input_dev *dev)
{
struct max77843_haptic *haptic = input_get_drvdata(dev);
int error;
cancel_work_sync(&haptic->work);
max77843_haptic_disable(haptic);
error = regulator_disable(haptic->motor_reg);
if (error)
dev_err(haptic->dev,
"failed to disable regulator: %d\n", error);
max77843_haptic_bias(haptic, false);
}
static int max77843_haptic_probe(struct platform_device *pdev)
{
struct max77693_dev *max77843 = dev_get_drvdata(pdev->dev.parent);
struct max77843_haptic *haptic;
int error;
haptic = devm_kzalloc(&pdev->dev, sizeof(*haptic), GFP_KERNEL);
if (!haptic)
return -ENOMEM;
haptic->regmap_haptic = max77843->regmap;
haptic->dev = &pdev->dev;
haptic->type = MAX77843_HAPTIC_LRA;
haptic->pwm_divisor = MAX77843_HAPTIC_PWM_DIVISOR_128;
INIT_WORK(&haptic->work, max77843_haptic_play_work);
mutex_init(&haptic->mutex);
haptic->pwm_dev = devm_pwm_get(&pdev->dev, NULL);
if (IS_ERR(haptic->pwm_dev)) {
dev_err(&pdev->dev, "failed to get pwm device\n");
return PTR_ERR(haptic->pwm_dev);
}
haptic->motor_reg = devm_regulator_get_exclusive(&pdev->dev, "haptic");
if (IS_ERR(haptic->motor_reg)) {
dev_err(&pdev->dev, "failed to get regulator\n");
return PTR_ERR(haptic->motor_reg);
}
haptic->input_dev = devm_input_allocate_device(&pdev->dev);
if (!haptic->input_dev) {
dev_err(&pdev->dev, "failed to allocate input device\n");
return -ENOMEM;
}
haptic->input_dev->name = "max77843-haptic";
haptic->input_dev->id.version = 1;
haptic->input_dev->dev.parent = &pdev->dev;
haptic->input_dev->open = max77843_haptic_open;
haptic->input_dev->close = max77843_haptic_close;
input_set_drvdata(haptic->input_dev, haptic);
input_set_capability(haptic->input_dev, EV_FF, FF_RUMBLE);
error = input_ff_create_memless(haptic->input_dev, NULL,
max77843_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;
}
platform_set_drvdata(pdev, haptic);
return 0;
}
static int __maybe_unused max77843_haptic_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct max77843_haptic *haptic = platform_get_drvdata(pdev);
int error;
error = mutex_lock_interruptible(&haptic->mutex);
if (error)
return error;
max77843_haptic_disable(haptic);
haptic->suspended = true;
mutex_unlock(&haptic->mutex);
return 0;
}
static int __maybe_unused max77843_haptic_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct max77843_haptic *haptic = platform_get_drvdata(pdev);
unsigned int magnitude;
mutex_lock(&haptic->mutex);
haptic->suspended = false;
magnitude = ACCESS_ONCE(haptic->magnitude);
if (magnitude)
max77843_haptic_enable(haptic);
mutex_unlock(&haptic->mutex);
return 0;
}
static SIMPLE_DEV_PM_OPS(max77843_haptic_pm_ops,
max77843_haptic_suspend, max77843_haptic_resume);
static struct platform_driver max77843_haptic_driver = {
.driver = {
.name = "max77843-haptic",
.pm = &max77843_haptic_pm_ops,
},
.probe = max77843_haptic_probe,
};
module_platform_driver(max77843_haptic_driver);
MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
MODULE_DESCRIPTION("MAXIM MAX77843 Haptic driver");
MODULE_LICENSE("GPL");