// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Regulator haptic driver
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*
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* Copyright (c) 2014 Samsung Electronics Co., Ltd.
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* Author: Jaewon Kim <jaewon02.kim@samsung.com>
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* Author: Hyunhee Kim <hyunhee.kim@samsung.com>
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*/
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#include <linux/input.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_data/regulator-haptic.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/consumer.h>
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#include <linux/slab.h>
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#define MAX_MAGNITUDE_SHIFT 16
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struct regulator_haptic {
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struct device *dev;
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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 active;
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bool suspended;
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unsigned int max_volt;
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unsigned int min_volt;
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unsigned int magnitude;
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};
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static int regulator_haptic_toggle(struct regulator_haptic *haptic, bool on)
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{
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int error;
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if (haptic->active != on) {
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error = on ? regulator_enable(haptic->regulator) :
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regulator_disable(haptic->regulator);
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if (error) {
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dev_err(haptic->dev,
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"failed to switch regulator %s: %d\n",
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on ? "on" : "off", error);
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return error;
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}
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haptic->active = on;
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}
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return 0;
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}
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static int regulator_haptic_set_voltage(struct regulator_haptic *haptic,
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unsigned int magnitude)
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{
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u64 volt_mag_multi;
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unsigned int intensity;
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int error;
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volt_mag_multi = (u64)(haptic->max_volt - haptic->min_volt) * magnitude;
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intensity = (unsigned int)(volt_mag_multi >> MAX_MAGNITUDE_SHIFT);
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error = regulator_set_voltage(haptic->regulator,
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intensity + haptic->min_volt,
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haptic->max_volt);
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if (error) {
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dev_err(haptic->dev, "cannot set regulator voltage to %d: %d\n",
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intensity + haptic->min_volt, error);
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return error;
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}
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regulator_haptic_toggle(haptic, !!magnitude);
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return 0;
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}
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static void regulator_haptic_work(struct work_struct *work)
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{
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struct regulator_haptic *haptic = container_of(work,
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struct regulator_haptic, work);
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mutex_lock(&haptic->mutex);
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if (!haptic->suspended)
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regulator_haptic_set_voltage(haptic, haptic->magnitude);
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mutex_unlock(&haptic->mutex);
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}
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static int regulator_haptic_play_effect(struct input_dev *input, void *data,
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struct ff_effect *effect)
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{
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struct regulator_haptic *haptic = input_get_drvdata(input);
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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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schedule_work(&haptic->work);
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return 0;
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}
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static void regulator_haptic_close(struct input_dev *input)
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{
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struct regulator_haptic *haptic = input_get_drvdata(input);
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cancel_work_sync(&haptic->work);
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regulator_haptic_set_voltage(haptic, 0);
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}
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static int __maybe_unused
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regulator_haptic_parse_dt(struct device *dev, struct regulator_haptic *haptic)
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{
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struct device_node *node;
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int error;
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node = dev->of_node;
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if(!node) {
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dev_err(dev, "Missing device tree data\n");
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return -EINVAL;
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}
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error = of_property_read_u32(node, "max-microvolt", &haptic->max_volt);
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if (error) {
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dev_err(dev, "cannot parse max-microvolt\n");
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return error;
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}
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error = of_property_read_u32(node, "min-microvolt", &haptic->min_volt);
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if (error) {
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dev_err(dev, "cannot parse min-microvolt\n");
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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 regulator_haptic_probe(struct platform_device *pdev)
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{
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const struct regulator_haptic_data *pdata = dev_get_platdata(&pdev->dev);
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struct regulator_haptic *haptic;
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struct input_dev *input_dev;
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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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platform_set_drvdata(pdev, haptic);
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haptic->dev = &pdev->dev;
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mutex_init(&haptic->mutex);
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INIT_WORK(&haptic->work, regulator_haptic_work);
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if (pdata) {
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haptic->max_volt = pdata->max_volt;
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haptic->min_volt = pdata->min_volt;
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} else if (IS_ENABLED(CONFIG_OF)) {
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error = regulator_haptic_parse_dt(&pdev->dev, haptic);
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if (error)
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return error;
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} else {
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dev_err(&pdev->dev, "Missing platform data\n");
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return -EINVAL;
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}
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haptic->regulator = devm_regulator_get_exclusive(&pdev->dev, "haptic");
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if (IS_ERR(haptic->regulator)) {
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dev_err(&pdev->dev, "failed to get regulator\n");
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return PTR_ERR(haptic->regulator);
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}
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input_dev = devm_input_allocate_device(&pdev->dev);
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if (!input_dev)
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return -ENOMEM;
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haptic->input_dev = input_dev;
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haptic->input_dev->name = "regulator-haptic";
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haptic->input_dev->dev.parent = &pdev->dev;
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haptic->input_dev->close = regulator_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(input_dev, NULL,
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regulator_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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return 0;
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}
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static int __maybe_unused regulator_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 regulator_haptic *haptic = platform_get_drvdata(pdev);
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int error;
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error = mutex_lock_interruptible(&haptic->mutex);
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if (error)
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return error;
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regulator_haptic_set_voltage(haptic, 0);
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haptic->suspended = true;
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mutex_unlock(&haptic->mutex);
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return 0;
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}
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static int __maybe_unused regulator_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 regulator_haptic *haptic = platform_get_drvdata(pdev);
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unsigned int magnitude;
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mutex_lock(&haptic->mutex);
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haptic->suspended = false;
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magnitude = READ_ONCE(haptic->magnitude);
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if (magnitude)
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regulator_haptic_set_voltage(haptic, magnitude);
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mutex_unlock(&haptic->mutex);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(regulator_haptic_pm_ops,
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regulator_haptic_suspend, regulator_haptic_resume);
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static const struct of_device_id regulator_haptic_dt_match[] = {
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{ .compatible = "regulator-haptic" },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, regulator_haptic_dt_match);
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static struct platform_driver regulator_haptic_driver = {
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.probe = regulator_haptic_probe,
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.driver = {
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.name = "regulator-haptic",
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.of_match_table = regulator_haptic_dt_match,
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.pm = ®ulator_haptic_pm_ops,
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},
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};
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module_platform_driver(regulator_haptic_driver);
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MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
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MODULE_AUTHOR("Hyunhee Kim <hyunhee.kim@samsung.com>");
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MODULE_DESCRIPTION("Regulator haptic driver");
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MODULE_LICENSE("GPL");
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