// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* MAX8997-haptic controller driver
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*
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* Copyright (C) 2012 Samsung Electronics
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* Donggeun Kim <dg77.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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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/err.h>
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#include <linux/pwm.h>
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#include <linux/input.h>
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#include <linux/mfd/max8997-private.h>
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#include <linux/mfd/max8997.h>
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#include <linux/regulator/consumer.h>
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/* Haptic configuration 2 register */
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#define MAX8997_MOTOR_TYPE_SHIFT 7
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#define MAX8997_ENABLE_SHIFT 6
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#define MAX8997_MODE_SHIFT 5
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/* Haptic driver configuration register */
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#define MAX8997_CYCLE_SHIFT 6
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#define MAX8997_SIG_PERIOD_SHIFT 4
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#define MAX8997_SIG_DUTY_SHIFT 2
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#define MAX8997_PWM_DUTY_SHIFT 0
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struct max8997_haptic {
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struct device *dev;
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struct i2c_client *client;
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struct input_dev *input_dev;
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struct regulator *regulator;
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struct work_struct work;
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struct mutex mutex;
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bool enabled;
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unsigned int level;
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struct pwm_device *pwm;
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unsigned int pwm_period;
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enum max8997_haptic_pwm_divisor pwm_divisor;
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enum max8997_haptic_motor_type type;
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enum max8997_haptic_pulse_mode mode;
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unsigned int internal_mode_pattern;
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unsigned int pattern_cycle;
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unsigned int pattern_signal_period;
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};
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static int max8997_haptic_set_duty_cycle(struct max8997_haptic *chip)
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{
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int ret = 0;
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if (chip->mode == MAX8997_EXTERNAL_MODE) {
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unsigned int duty = chip->pwm_period * chip->level / 100;
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ret = pwm_config(chip->pwm, duty, chip->pwm_period);
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} else {
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int i;
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u8 duty_index = 0;
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for (i = 0; i <= 64; i++) {
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if (chip->level <= i * 100 / 64) {
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duty_index = i;
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break;
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}
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}
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switch (chip->internal_mode_pattern) {
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case 0:
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max8997_write_reg(chip->client,
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MAX8997_HAPTIC_REG_SIGPWMDC1, duty_index);
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break;
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case 1:
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max8997_write_reg(chip->client,
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MAX8997_HAPTIC_REG_SIGPWMDC2, duty_index);
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break;
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case 2:
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max8997_write_reg(chip->client,
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MAX8997_HAPTIC_REG_SIGPWMDC3, duty_index);
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break;
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case 3:
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max8997_write_reg(chip->client,
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MAX8997_HAPTIC_REG_SIGPWMDC4, duty_index);
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break;
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default:
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break;
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}
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}
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return ret;
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}
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static void max8997_haptic_configure(struct max8997_haptic *chip)
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{
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u8 value;
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value = chip->type << MAX8997_MOTOR_TYPE_SHIFT |
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chip->enabled << MAX8997_ENABLE_SHIFT |
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chip->mode << MAX8997_MODE_SHIFT | chip->pwm_divisor;
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max8997_write_reg(chip->client, MAX8997_HAPTIC_REG_CONF2, value);
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if (chip->mode == MAX8997_INTERNAL_MODE && chip->enabled) {
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value = chip->internal_mode_pattern << MAX8997_CYCLE_SHIFT |
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chip->internal_mode_pattern << MAX8997_SIG_PERIOD_SHIFT |
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chip->internal_mode_pattern << MAX8997_SIG_DUTY_SHIFT |
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chip->internal_mode_pattern << MAX8997_PWM_DUTY_SHIFT;
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max8997_write_reg(chip->client,
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MAX8997_HAPTIC_REG_DRVCONF, value);
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switch (chip->internal_mode_pattern) {
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case 0:
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value = chip->pattern_cycle << 4;
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max8997_write_reg(chip->client,
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MAX8997_HAPTIC_REG_CYCLECONF1, value);
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value = chip->pattern_signal_period;
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max8997_write_reg(chip->client,
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MAX8997_HAPTIC_REG_SIGCONF1, value);
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break;
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case 1:
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value = chip->pattern_cycle;
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max8997_write_reg(chip->client,
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MAX8997_HAPTIC_REG_CYCLECONF1, value);
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value = chip->pattern_signal_period;
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max8997_write_reg(chip->client,
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MAX8997_HAPTIC_REG_SIGCONF2, value);
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break;
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case 2:
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value = chip->pattern_cycle << 4;
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max8997_write_reg(chip->client,
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MAX8997_HAPTIC_REG_CYCLECONF2, value);
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value = chip->pattern_signal_period;
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max8997_write_reg(chip->client,
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MAX8997_HAPTIC_REG_SIGCONF3, value);
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break;
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case 3:
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value = chip->pattern_cycle;
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max8997_write_reg(chip->client,
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MAX8997_HAPTIC_REG_CYCLECONF2, value);
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value = chip->pattern_signal_period;
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max8997_write_reg(chip->client,
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MAX8997_HAPTIC_REG_SIGCONF4, value);
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break;
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default:
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break;
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}
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}
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}
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static void max8997_haptic_enable(struct max8997_haptic *chip)
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{
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int error;
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mutex_lock(&chip->mutex);
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error = max8997_haptic_set_duty_cycle(chip);
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if (error) {
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dev_err(chip->dev, "set_pwm_cycle failed, error: %d\n", error);
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goto out;
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}
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if (!chip->enabled) {
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error = regulator_enable(chip->regulator);
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if (error) {
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dev_err(chip->dev, "Failed to enable regulator\n");
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goto out;
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}
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max8997_haptic_configure(chip);
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if (chip->mode == MAX8997_EXTERNAL_MODE) {
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error = pwm_enable(chip->pwm);
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if (error) {
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dev_err(chip->dev, "Failed to enable PWM\n");
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regulator_disable(chip->regulator);
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goto out;
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}
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}
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chip->enabled = true;
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}
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out:
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mutex_unlock(&chip->mutex);
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}
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static void max8997_haptic_disable(struct max8997_haptic *chip)
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{
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mutex_lock(&chip->mutex);
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if (chip->enabled) {
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chip->enabled = false;
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max8997_haptic_configure(chip);
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if (chip->mode == MAX8997_EXTERNAL_MODE)
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pwm_disable(chip->pwm);
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regulator_disable(chip->regulator);
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}
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mutex_unlock(&chip->mutex);
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}
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static void max8997_haptic_play_effect_work(struct work_struct *work)
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{
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struct max8997_haptic *chip =
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container_of(work, struct max8997_haptic, work);
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if (chip->level)
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max8997_haptic_enable(chip);
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else
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max8997_haptic_disable(chip);
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}
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static int max8997_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 max8997_haptic *chip = input_get_drvdata(dev);
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chip->level = effect->u.rumble.strong_magnitude;
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if (!chip->level)
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chip->level = effect->u.rumble.weak_magnitude;
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schedule_work(&chip->work);
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return 0;
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}
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static void max8997_haptic_close(struct input_dev *dev)
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{
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struct max8997_haptic *chip = input_get_drvdata(dev);
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cancel_work_sync(&chip->work);
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max8997_haptic_disable(chip);
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}
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static int max8997_haptic_probe(struct platform_device *pdev)
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{
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struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
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const struct max8997_platform_data *pdata =
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dev_get_platdata(iodev->dev);
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const struct max8997_haptic_platform_data *haptic_pdata = NULL;
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struct max8997_haptic *chip;
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struct input_dev *input_dev;
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int error;
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if (pdata)
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haptic_pdata = pdata->haptic_pdata;
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if (!haptic_pdata) {
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dev_err(&pdev->dev, "no haptic platform data\n");
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return -EINVAL;
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}
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chip = kzalloc(sizeof(struct max8997_haptic), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!chip || !input_dev) {
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dev_err(&pdev->dev, "unable to allocate memory\n");
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error = -ENOMEM;
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goto err_free_mem;
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}
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INIT_WORK(&chip->work, max8997_haptic_play_effect_work);
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mutex_init(&chip->mutex);
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chip->client = iodev->haptic;
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chip->dev = &pdev->dev;
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chip->input_dev = input_dev;
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chip->pwm_period = haptic_pdata->pwm_period;
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chip->type = haptic_pdata->type;
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chip->mode = haptic_pdata->mode;
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chip->pwm_divisor = haptic_pdata->pwm_divisor;
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switch (chip->mode) {
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case MAX8997_INTERNAL_MODE:
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chip->internal_mode_pattern =
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haptic_pdata->internal_mode_pattern;
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chip->pattern_cycle = haptic_pdata->pattern_cycle;
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chip->pattern_signal_period =
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haptic_pdata->pattern_signal_period;
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break;
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case MAX8997_EXTERNAL_MODE:
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chip->pwm = pwm_request(haptic_pdata->pwm_channel_id,
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"max8997-haptic");
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if (IS_ERR(chip->pwm)) {
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error = PTR_ERR(chip->pwm);
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dev_err(&pdev->dev,
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"unable to request PWM for haptic, error: %d\n",
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error);
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goto err_free_mem;
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}
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/*
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* FIXME: pwm_apply_args() should be removed when switching to
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* the atomic PWM API.
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*/
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pwm_apply_args(chip->pwm);
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break;
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default:
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dev_err(&pdev->dev,
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"Invalid chip mode specified (%d)\n", chip->mode);
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error = -EINVAL;
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goto err_free_mem;
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}
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chip->regulator = regulator_get(&pdev->dev, "inmotor");
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if (IS_ERR(chip->regulator)) {
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error = PTR_ERR(chip->regulator);
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dev_err(&pdev->dev,
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"unable to get regulator, error: %d\n",
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error);
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goto err_free_pwm;
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}
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input_dev->name = "max8997-haptic";
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input_dev->id.version = 1;
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input_dev->dev.parent = &pdev->dev;
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input_dev->close = max8997_haptic_close;
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input_set_drvdata(input_dev, chip);
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input_set_capability(input_dev, EV_FF, FF_RUMBLE);
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error = input_ff_create_memless(input_dev, NULL,
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max8997_haptic_play_effect);
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if (error) {
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dev_err(&pdev->dev,
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"unable to create FF device, error: %d\n",
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error);
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goto err_put_regulator;
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}
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error = input_register_device(input_dev);
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if (error) {
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dev_err(&pdev->dev,
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"unable to register input device, error: %d\n",
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error);
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goto err_destroy_ff;
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}
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platform_set_drvdata(pdev, chip);
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return 0;
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err_destroy_ff:
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input_ff_destroy(input_dev);
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err_put_regulator:
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regulator_put(chip->regulator);
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err_free_pwm:
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if (chip->mode == MAX8997_EXTERNAL_MODE)
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pwm_free(chip->pwm);
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err_free_mem:
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input_free_device(input_dev);
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kfree(chip);
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return error;
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}
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static int max8997_haptic_remove(struct platform_device *pdev)
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{
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struct max8997_haptic *chip = platform_get_drvdata(pdev);
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input_unregister_device(chip->input_dev);
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regulator_put(chip->regulator);
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if (chip->mode == MAX8997_EXTERNAL_MODE)
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pwm_free(chip->pwm);
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kfree(chip);
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return 0;
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}
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static int __maybe_unused max8997_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 max8997_haptic *chip = platform_get_drvdata(pdev);
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max8997_haptic_disable(chip);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(max8997_haptic_pm_ops, max8997_haptic_suspend, NULL);
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static const struct platform_device_id max8997_haptic_id[] = {
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{ "max8997-haptic", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(platform, max8997_haptic_id);
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static struct platform_driver max8997_haptic_driver = {
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.driver = {
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.name = "max8997-haptic",
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.pm = &max8997_haptic_pm_ops,
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},
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.probe = max8997_haptic_probe,
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.remove = max8997_haptic_remove,
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.id_table = max8997_haptic_id,
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};
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module_platform_driver(max8997_haptic_driver);
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MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
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MODULE_DESCRIPTION("max8997_haptic driver");
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MODULE_LICENSE("GPL");
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