blob: 46b0f48fbf49a3f6feb578e768a336c63f2c9fec [file] [log] [blame]
/*
* MAXIM MAX77693/MAX77843 Haptic device driver
*
* Copyright (C) 2014,2015 Samsung Electronics
* Jaewon Kim <jaewon02.kim@samsung.com>
* Krzysztof Kozlowski <krzk@kernel.org>
*
* This program is not provided / owned by Maxim Integrated Products.
*
* 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/init.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/regulator/consumer.h>
#include <linux/mfd/max77693.h>
#include <linux/mfd/max77693-common.h>
#include <linux/mfd/max77693-private.h>
#include <linux/mfd/max77843-private.h>
#define MAX_MAGNITUDE_SHIFT 16
enum max77693_haptic_motor_type {
MAX77693_HAPTIC_ERM = 0,
MAX77693_HAPTIC_LRA,
};
enum max77693_haptic_pulse_mode {
MAX77693_HAPTIC_EXTERNAL_MODE = 0,
MAX77693_HAPTIC_INTERNAL_MODE,
};
enum max77693_haptic_pwm_divisor {
MAX77693_HAPTIC_PWM_DIVISOR_32 = 0,
MAX77693_HAPTIC_PWM_DIVISOR_64,
MAX77693_HAPTIC_PWM_DIVISOR_128,
MAX77693_HAPTIC_PWM_DIVISOR_256,
};
struct max77693_haptic {
enum max77693_types dev_type;
struct regmap *regmap_pmic;
struct regmap *regmap_haptic;
struct device *dev;
struct input_dev *input_dev;
struct pwm_device *pwm_dev;
struct regulator *motor_reg;
bool enabled;
bool suspend_state;
unsigned int magnitude;
unsigned int pwm_duty;
enum max77693_haptic_motor_type type;
enum max77693_haptic_pulse_mode mode;
struct work_struct work;
};
static int max77693_haptic_set_duty_cycle(struct max77693_haptic *haptic)
{
struct pwm_args pargs;
int delta;
int error;
pwm_get_args(haptic->pwm_dev, &pargs);
delta = (pargs.period + haptic->pwm_duty) / 2;
error = pwm_config(haptic->pwm_dev, delta, pargs.period);
if (error) {
dev_err(haptic->dev, "failed to configure pwm: %d\n", error);
return error;
}
return 0;
}
static int max77843_haptic_bias(struct max77693_haptic *haptic, bool on)
{
int error;
if (haptic->dev_type != TYPE_MAX77843)
return 0;
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 max77693_haptic_configure(struct max77693_haptic *haptic,
bool enable)
{
unsigned int value, config_reg;
int error;
switch (haptic->dev_type) {
case TYPE_MAX77693:
value = ((haptic->type << MAX77693_CONFIG2_MODE) |
(enable << MAX77693_CONFIG2_MEN) |
(haptic->mode << MAX77693_CONFIG2_HTYP) |
MAX77693_HAPTIC_PWM_DIVISOR_128);
config_reg = MAX77693_HAPTIC_REG_CONFIG2;
break;
case TYPE_MAX77843:
value = (haptic->type << MCONFIG_MODE_SHIFT) |
(enable << MCONFIG_MEN_SHIFT) |
MAX77693_HAPTIC_PWM_DIVISOR_128;
config_reg = MAX77843_HAP_REG_MCONFIG;
break;
default:
return -EINVAL;
}
error = regmap_write(haptic->regmap_haptic,
config_reg, value);
if (error) {
dev_err(haptic->dev,
"failed to update haptic config: %d\n", error);
return error;
}
return 0;
}
static int max77693_haptic_lowsys(struct max77693_haptic *haptic, bool enable)
{
int error;
if (haptic->dev_type != TYPE_MAX77693)
return 0;
error = regmap_update_bits(haptic->regmap_pmic,
MAX77693_PMIC_REG_LSCNFG,
MAX77693_PMIC_LOW_SYS_MASK,
enable << MAX77693_PMIC_LOW_SYS_SHIFT);
if (error) {
dev_err(haptic->dev, "cannot update pmic regmap: %d\n", error);
return error;
}
return 0;
}
static void max77693_haptic_enable(struct max77693_haptic *haptic)
{
int error;
if (haptic->enabled)
return;
error = pwm_enable(haptic->pwm_dev);
if (error) {
dev_err(haptic->dev,
"failed to enable haptic pwm device: %d\n", error);
return;
}
error = max77693_haptic_lowsys(haptic, true);
if (error)
goto err_enable_lowsys;
error = max77693_haptic_configure(haptic, true);
if (error)
goto err_enable_config;
haptic->enabled = true;
return;
err_enable_config:
max77693_haptic_lowsys(haptic, false);
err_enable_lowsys:
pwm_disable(haptic->pwm_dev);
}
static void max77693_haptic_disable(struct max77693_haptic *haptic)
{
int error;
if (!haptic->enabled)
return;
error = max77693_haptic_configure(haptic, false);
if (error)
return;
error = max77693_haptic_lowsys(haptic, false);
if (error)
goto err_disable_lowsys;
pwm_disable(haptic->pwm_dev);
haptic->enabled = false;
return;
err_disable_lowsys:
max77693_haptic_configure(haptic, true);
}
static void max77693_haptic_play_work(struct work_struct *work)
{
struct max77693_haptic *haptic =
container_of(work, struct max77693_haptic, work);
int error;
error = max77693_haptic_set_duty_cycle(haptic);
if (error) {
dev_err(haptic->dev, "failed to set duty cycle: %d\n", error);
return;
}
if (haptic->magnitude)
max77693_haptic_enable(haptic);
else
max77693_haptic_disable(haptic);
}
static int max77693_haptic_play_effect(struct input_dev *dev, void *data,
struct ff_effect *effect)
{
struct max77693_haptic *haptic = input_get_drvdata(dev);
struct pwm_args pargs;
u64 period_mag_multi;
haptic->magnitude = effect->u.rumble.strong_magnitude;
if (!haptic->magnitude)
haptic->magnitude = effect->u.rumble.weak_magnitude;
/*
* The magnitude comes from force-feedback interface.
* The formula to convert magnitude to pwm_duty as follows:
* - pwm_duty = (magnitude * pwm_period) / MAX_MAGNITUDE(0xFFFF)
*/
pwm_get_args(haptic->pwm_dev, &pargs);
period_mag_multi = (u64)pargs.period * haptic->magnitude;
haptic->pwm_duty = (unsigned int)(period_mag_multi >>
MAX_MAGNITUDE_SHIFT);
schedule_work(&haptic->work);
return 0;
}
static int max77693_haptic_open(struct input_dev *dev)
{
struct max77693_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 max77693_haptic_close(struct input_dev *dev)
{
struct max77693_haptic *haptic = input_get_drvdata(dev);
int error;
cancel_work_sync(&haptic->work);
max77693_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 max77693_haptic_probe(struct platform_device *pdev)
{
struct max77693_dev *max77693 = dev_get_drvdata(pdev->dev.parent);
struct max77693_haptic *haptic;
int error;
haptic = devm_kzalloc(&pdev->dev, sizeof(*haptic), GFP_KERNEL);
if (!haptic)
return -ENOMEM;
haptic->regmap_pmic = max77693->regmap;
haptic->dev = &pdev->dev;
haptic->type = MAX77693_HAPTIC_LRA;
haptic->mode = MAX77693_HAPTIC_EXTERNAL_MODE;
haptic->suspend_state = false;
/* Variant-specific init */
haptic->dev_type = platform_get_device_id(pdev)->driver_data;
switch (haptic->dev_type) {
case TYPE_MAX77693:
haptic->regmap_haptic = max77693->regmap_haptic;
break;
case TYPE_MAX77843:
haptic->regmap_haptic = max77693->regmap;
break;
default:
dev_err(&pdev->dev, "unsupported device type: %u\n",
haptic->dev_type);
return -EINVAL;
}
INIT_WORK(&haptic->work, max77693_haptic_play_work);
/* Get pwm and regulatot for haptic device */
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);
}
/*
* FIXME: pwm_apply_args() should be removed when switching to the
* atomic PWM API.
*/
pwm_apply_args(haptic->pwm_dev);
haptic->motor_reg = devm_regulator_get(&pdev->dev, "haptic");
if (IS_ERR(haptic->motor_reg)) {
dev_err(&pdev->dev, "failed to get regulator\n");
return PTR_ERR(haptic->motor_reg);
}
/* Initialize input device for haptic device */
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 = "max77693-haptic";
haptic->input_dev->id.version = 1;
haptic->input_dev->dev.parent = &pdev->dev;
haptic->input_dev->open = max77693_haptic_open;
haptic->input_dev->close = max77693_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,
max77693_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 max77693_haptic_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct max77693_haptic *haptic = platform_get_drvdata(pdev);
if (haptic->enabled) {
max77693_haptic_disable(haptic);
haptic->suspend_state = true;
}
return 0;
}
static int __maybe_unused max77693_haptic_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct max77693_haptic *haptic = platform_get_drvdata(pdev);
if (haptic->suspend_state) {
max77693_haptic_enable(haptic);
haptic->suspend_state = false;
}
return 0;
}
static SIMPLE_DEV_PM_OPS(max77693_haptic_pm_ops,
max77693_haptic_suspend, max77693_haptic_resume);
static const struct platform_device_id max77693_haptic_id[] = {
{ "max77693-haptic", TYPE_MAX77693 },
{ "max77843-haptic", TYPE_MAX77843 },
{},
};
MODULE_DEVICE_TABLE(platform, max77693_haptic_id);
static struct platform_driver max77693_haptic_driver = {
.driver = {
.name = "max77693-haptic",
.pm = &max77693_haptic_pm_ops,
},
.probe = max77693_haptic_probe,
.id_table = max77693_haptic_id,
};
module_platform_driver(max77693_haptic_driver);
MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
MODULE_DESCRIPTION("MAXIM 77693/77843 Haptic driver");
MODULE_ALIAS("platform:max77693-haptic");
MODULE_LICENSE("GPL");