+++ /dev/null
-/*
- * 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");
projects / firefly-linux-kernel-4.4.55.git / commitdiff