356 lines
8.5 KiB
C
356 lines
8.5 KiB
C
/*
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* MAXIM MAX77693 Haptic device driver
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*
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* Copyright (C) 2014 Samsung Electronics
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* Jaewon Kim <jaewon02.kim@samsung.com>
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*
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* This program is not provided / owned by Maxim Integrated Products.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/regmap.h>
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#include <linux/input.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/pwm.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include <linux/regulator/consumer.h>
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#include <linux/mfd/max77693.h>
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#include <linux/mfd/max77693-private.h>
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#define MAX_MAGNITUDE_SHIFT 16
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enum max77693_haptic_motor_type {
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MAX77693_HAPTIC_ERM = 0,
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MAX77693_HAPTIC_LRA,
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};
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enum max77693_haptic_pulse_mode {
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MAX77693_HAPTIC_EXTERNAL_MODE = 0,
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MAX77693_HAPTIC_INTERNAL_MODE,
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};
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enum max77693_haptic_pwm_divisor {
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MAX77693_HAPTIC_PWM_DIVISOR_32 = 0,
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MAX77693_HAPTIC_PWM_DIVISOR_64,
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MAX77693_HAPTIC_PWM_DIVISOR_128,
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MAX77693_HAPTIC_PWM_DIVISOR_256,
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};
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struct max77693_haptic {
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struct regmap *regmap_pmic;
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struct regmap *regmap_haptic;
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struct device *dev;
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struct input_dev *input_dev;
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struct pwm_device *pwm_dev;
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struct regulator *motor_reg;
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bool enabled;
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bool suspend_state;
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unsigned int magnitude;
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unsigned int pwm_duty;
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enum max77693_haptic_motor_type type;
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enum max77693_haptic_pulse_mode mode;
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enum max77693_haptic_pwm_divisor pwm_divisor;
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struct work_struct work;
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};
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static int max77693_haptic_set_duty_cycle(struct max77693_haptic *haptic)
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{
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int delta = (haptic->pwm_dev->period + haptic->pwm_duty) / 2;
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int error;
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error = pwm_config(haptic->pwm_dev, delta, haptic->pwm_dev->period);
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if (error) {
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dev_err(haptic->dev, "failed to configure pwm: %d\n", error);
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return error;
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}
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return 0;
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}
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static int max77693_haptic_configure(struct max77693_haptic *haptic,
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bool enable)
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{
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unsigned int value;
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int error;
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value = ((haptic->type << MAX77693_CONFIG2_MODE) |
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(enable << MAX77693_CONFIG2_MEN) |
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(haptic->mode << MAX77693_CONFIG2_HTYP) |
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(haptic->pwm_divisor));
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error = regmap_write(haptic->regmap_haptic,
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MAX77693_HAPTIC_REG_CONFIG2, value);
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if (error) {
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dev_err(haptic->dev,
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"failed to update haptic config: %d\n", error);
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return error;
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}
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return 0;
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}
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static int max77693_haptic_lowsys(struct max77693_haptic *haptic, bool enable)
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{
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int error;
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error = regmap_update_bits(haptic->regmap_pmic,
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MAX77693_PMIC_REG_LSCNFG,
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MAX77693_PMIC_LOW_SYS_MASK,
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enable << MAX77693_PMIC_LOW_SYS_SHIFT);
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if (error) {
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dev_err(haptic->dev, "cannot update pmic regmap: %d\n", error);
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return error;
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}
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return 0;
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}
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static void max77693_haptic_enable(struct max77693_haptic *haptic)
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{
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int error;
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if (haptic->enabled)
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return;
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error = pwm_enable(haptic->pwm_dev);
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if (error) {
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dev_err(haptic->dev,
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"failed to enable haptic pwm device: %d\n", error);
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return;
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}
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error = max77693_haptic_lowsys(haptic, true);
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if (error)
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goto err_enable_lowsys;
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error = max77693_haptic_configure(haptic, true);
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if (error)
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goto err_enable_config;
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haptic->enabled = true;
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return;
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err_enable_config:
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max77693_haptic_lowsys(haptic, false);
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err_enable_lowsys:
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pwm_disable(haptic->pwm_dev);
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}
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static void max77693_haptic_disable(struct max77693_haptic *haptic)
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{
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int error;
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if (!haptic->enabled)
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return;
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error = max77693_haptic_configure(haptic, false);
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if (error)
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return;
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error = max77693_haptic_lowsys(haptic, false);
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if (error)
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goto err_disable_lowsys;
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pwm_disable(haptic->pwm_dev);
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haptic->enabled = false;
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return;
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err_disable_lowsys:
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max77693_haptic_configure(haptic, true);
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}
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static void max77693_haptic_play_work(struct work_struct *work)
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{
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struct max77693_haptic *haptic =
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container_of(work, struct max77693_haptic, work);
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int error;
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error = max77693_haptic_set_duty_cycle(haptic);
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if (error) {
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dev_err(haptic->dev, "failed to set duty cycle: %d\n", error);
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return;
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}
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if (haptic->magnitude)
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max77693_haptic_enable(haptic);
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else
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max77693_haptic_disable(haptic);
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}
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static int max77693_haptic_play_effect(struct input_dev *dev, void *data,
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struct ff_effect *effect)
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{
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struct max77693_haptic *haptic = input_get_drvdata(dev);
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u64 period_mag_multi;
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haptic->magnitude = effect->u.rumble.strong_magnitude;
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if (!haptic->magnitude)
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haptic->magnitude = effect->u.rumble.weak_magnitude;
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/*
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* The magnitude comes from force-feedback interface.
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* The formula to convert magnitude to pwm_duty as follows:
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* - pwm_duty = (magnitude * pwm_period) / MAX_MAGNITUDE(0xFFFF)
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*/
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period_mag_multi = (u64)haptic->pwm_dev->period * haptic->magnitude;
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haptic->pwm_duty = (unsigned int)(period_mag_multi >>
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MAX_MAGNITUDE_SHIFT);
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schedule_work(&haptic->work);
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return 0;
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}
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static int max77693_haptic_open(struct input_dev *dev)
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{
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struct max77693_haptic *haptic = input_get_drvdata(dev);
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int error;
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error = regulator_enable(haptic->motor_reg);
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if (error) {
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dev_err(haptic->dev,
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"failed to enable regulator: %d\n", error);
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return error;
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}
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return 0;
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}
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static void max77693_haptic_close(struct input_dev *dev)
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{
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struct max77693_haptic *haptic = input_get_drvdata(dev);
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int error;
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cancel_work_sync(&haptic->work);
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max77693_haptic_disable(haptic);
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error = regulator_disable(haptic->motor_reg);
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if (error)
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dev_err(haptic->dev,
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"failed to disable regulator: %d\n", error);
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}
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static int max77693_haptic_probe(struct platform_device *pdev)
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{
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struct max77693_dev *max77693 = dev_get_drvdata(pdev->dev.parent);
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struct max77693_haptic *haptic;
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int error;
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haptic = devm_kzalloc(&pdev->dev, sizeof(*haptic), GFP_KERNEL);
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if (!haptic)
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return -ENOMEM;
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haptic->regmap_pmic = max77693->regmap;
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haptic->regmap_haptic = max77693->regmap_haptic;
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haptic->dev = &pdev->dev;
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haptic->type = MAX77693_HAPTIC_LRA;
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haptic->mode = MAX77693_HAPTIC_EXTERNAL_MODE;
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haptic->pwm_divisor = MAX77693_HAPTIC_PWM_DIVISOR_128;
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haptic->suspend_state = false;
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INIT_WORK(&haptic->work, max77693_haptic_play_work);
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/* Get pwm and regulatot for haptic device */
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haptic->pwm_dev = devm_pwm_get(&pdev->dev, NULL);
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if (IS_ERR(haptic->pwm_dev)) {
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dev_err(&pdev->dev, "failed to get pwm device\n");
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return PTR_ERR(haptic->pwm_dev);
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}
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haptic->motor_reg = devm_regulator_get(&pdev->dev, "haptic");
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if (IS_ERR(haptic->motor_reg)) {
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dev_err(&pdev->dev, "failed to get regulator\n");
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return PTR_ERR(haptic->motor_reg);
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}
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/* Initialize input device for haptic device */
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haptic->input_dev = devm_input_allocate_device(&pdev->dev);
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if (!haptic->input_dev) {
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dev_err(&pdev->dev, "failed to allocate input device\n");
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return -ENOMEM;
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}
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haptic->input_dev->name = "max77693-haptic";
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haptic->input_dev->id.version = 1;
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haptic->input_dev->dev.parent = &pdev->dev;
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haptic->input_dev->open = max77693_haptic_open;
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haptic->input_dev->close = max77693_haptic_close;
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input_set_drvdata(haptic->input_dev, haptic);
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input_set_capability(haptic->input_dev, EV_FF, FF_RUMBLE);
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error = input_ff_create_memless(haptic->input_dev, NULL,
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max77693_haptic_play_effect);
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if (error) {
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dev_err(&pdev->dev, "failed to create force-feedback\n");
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return error;
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}
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error = input_register_device(haptic->input_dev);
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if (error) {
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dev_err(&pdev->dev, "failed to register input device\n");
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return error;
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}
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platform_set_drvdata(pdev, haptic);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int max77693_haptic_suspend(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct max77693_haptic *haptic = platform_get_drvdata(pdev);
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if (haptic->enabled) {
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max77693_haptic_disable(haptic);
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haptic->suspend_state = true;
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}
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return 0;
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}
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static int max77693_haptic_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct max77693_haptic *haptic = platform_get_drvdata(pdev);
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if (haptic->suspend_state) {
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max77693_haptic_enable(haptic);
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haptic->suspend_state = false;
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}
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(max77693_haptic_pm_ops,
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max77693_haptic_suspend, max77693_haptic_resume);
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static struct platform_driver max77693_haptic_driver = {
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.driver = {
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.name = "max77693-haptic",
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.owner = THIS_MODULE,
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.pm = &max77693_haptic_pm_ops,
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},
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.probe = max77693_haptic_probe,
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};
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module_platform_driver(max77693_haptic_driver);
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MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
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MODULE_DESCRIPTION("MAXIM MAX77693 Haptic driver");
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MODULE_ALIAS("platform:max77693-haptic");
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MODULE_LICENSE("GPL");
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