| /* |
| * Regulator haptic driver |
| * |
| * Copyright (c) 2014 Samsung Electronics Co., Ltd. |
| * Author: Jaewon Kim <jaewon02.kim@samsung.com> |
| * Author: Hyunhee Kim <hyunhee.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 version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/input.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/platform_data/regulator-haptic.h> |
| #include <linux/platform_device.h> |
| #include <linux/regulator/consumer.h> |
| #include <linux/slab.h> |
| |
| #define MAX_MAGNITUDE_SHIFT 16 |
| |
| struct regulator_haptic { |
| struct device *dev; |
| struct input_dev *input_dev; |
| struct regulator *regulator; |
| |
| struct work_struct work; |
| struct mutex mutex; |
| |
| bool active; |
| bool suspended; |
| |
| unsigned int max_volt; |
| unsigned int min_volt; |
| unsigned int magnitude; |
| }; |
| |
| static int regulator_haptic_toggle(struct regulator_haptic *haptic, bool on) |
| { |
| int error; |
| |
| if (haptic->active != on) { |
| |
| error = on ? regulator_enable(haptic->regulator) : |
| regulator_disable(haptic->regulator); |
| if (error) { |
| dev_err(haptic->dev, |
| "failed to switch regulator %s: %d\n", |
| on ? "on" : "off", error); |
| return error; |
| } |
| |
| haptic->active = on; |
| } |
| |
| return 0; |
| } |
| |
| static int regulator_haptic_set_voltage(struct regulator_haptic *haptic, |
| unsigned int magnitude) |
| { |
| u64 volt_mag_multi; |
| unsigned int intensity; |
| int error; |
| |
| volt_mag_multi = (u64)(haptic->max_volt - haptic->min_volt) * magnitude; |
| intensity = (unsigned int)(volt_mag_multi >> MAX_MAGNITUDE_SHIFT); |
| |
| error = regulator_set_voltage(haptic->regulator, |
| intensity + haptic->min_volt, |
| haptic->max_volt); |
| if (error) { |
| dev_err(haptic->dev, "cannot set regulator voltage to %d: %d\n", |
| intensity + haptic->min_volt, error); |
| return error; |
| } |
| |
| regulator_haptic_toggle(haptic, !!magnitude); |
| |
| return 0; |
| } |
| |
| static void regulator_haptic_work(struct work_struct *work) |
| { |
| struct regulator_haptic *haptic = container_of(work, |
| struct regulator_haptic, work); |
| |
| mutex_lock(&haptic->mutex); |
| |
| if (!haptic->suspended) |
| regulator_haptic_set_voltage(haptic, haptic->magnitude); |
| |
| mutex_unlock(&haptic->mutex); |
| } |
| |
| static int regulator_haptic_play_effect(struct input_dev *input, void *data, |
| struct ff_effect *effect) |
| { |
| struct regulator_haptic *haptic = input_get_drvdata(input); |
| |
| haptic->magnitude = effect->u.rumble.strong_magnitude; |
| if (!haptic->magnitude) |
| haptic->magnitude = effect->u.rumble.weak_magnitude; |
| |
| schedule_work(&haptic->work); |
| |
| return 0; |
| } |
| |
| static void regulator_haptic_close(struct input_dev *input) |
| { |
| struct regulator_haptic *haptic = input_get_drvdata(input); |
| |
| cancel_work_sync(&haptic->work); |
| regulator_haptic_set_voltage(haptic, 0); |
| } |
| |
| static int __maybe_unused |
| regulator_haptic_parse_dt(struct device *dev, struct regulator_haptic *haptic) |
| { |
| struct device_node *node; |
| int error; |
| |
| node = dev->of_node; |
| if(!node) { |
| dev_err(dev, "Missing device tree data\n"); |
| return -EINVAL; |
| } |
| |
| error = of_property_read_u32(node, "max-microvolt", &haptic->max_volt); |
| if (error) { |
| dev_err(dev, "cannot parse max-microvolt\n"); |
| return error; |
| } |
| |
| error = of_property_read_u32(node, "min-microvolt", &haptic->min_volt); |
| if (error) { |
| dev_err(dev, "cannot parse min-microvolt\n"); |
| return error; |
| } |
| |
| return 0; |
| } |
| |
| static int regulator_haptic_probe(struct platform_device *pdev) |
| { |
| const struct regulator_haptic_data *pdata = dev_get_platdata(&pdev->dev); |
| struct regulator_haptic *haptic; |
| struct input_dev *input_dev; |
| int error; |
| |
| haptic = devm_kzalloc(&pdev->dev, sizeof(*haptic), GFP_KERNEL); |
| if (!haptic) |
| return -ENOMEM; |
| |
| platform_set_drvdata(pdev, haptic); |
| haptic->dev = &pdev->dev; |
| mutex_init(&haptic->mutex); |
| INIT_WORK(&haptic->work, regulator_haptic_work); |
| |
| if (pdata) { |
| haptic->max_volt = pdata->max_volt; |
| haptic->min_volt = pdata->min_volt; |
| } else if (IS_ENABLED(CONFIG_OF)) { |
| error = regulator_haptic_parse_dt(&pdev->dev, haptic); |
| if (error) |
| return error; |
| } else { |
| dev_err(&pdev->dev, "Missing platform data\n"); |
| return -EINVAL; |
| } |
| |
| haptic->regulator = devm_regulator_get_exclusive(&pdev->dev, "haptic"); |
| if (IS_ERR(haptic->regulator)) { |
| dev_err(&pdev->dev, "failed to get regulator\n"); |
| return PTR_ERR(haptic->regulator); |
| } |
| |
| input_dev = devm_input_allocate_device(&pdev->dev); |
| if (!input_dev) |
| return -ENOMEM; |
| |
| haptic->input_dev = input_dev; |
| haptic->input_dev->name = "regulator-haptic"; |
| haptic->input_dev->dev.parent = &pdev->dev; |
| haptic->input_dev->close = regulator_haptic_close; |
| input_set_drvdata(haptic->input_dev, haptic); |
| input_set_capability(haptic->input_dev, EV_FF, FF_RUMBLE); |
| |
| error = input_ff_create_memless(input_dev, NULL, |
| regulator_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; |
| } |
| |
| return 0; |
| } |
| |
| static int __maybe_unused regulator_haptic_suspend(struct device *dev) |
| { |
| struct platform_device *pdev = to_platform_device(dev); |
| struct regulator_haptic *haptic = platform_get_drvdata(pdev); |
| int error; |
| |
| error = mutex_lock_interruptible(&haptic->mutex); |
| if (error) |
| return error; |
| |
| regulator_haptic_set_voltage(haptic, 0); |
| |
| haptic->suspended = true; |
| |
| mutex_unlock(&haptic->mutex); |
| |
| return 0; |
| } |
| |
| static int __maybe_unused regulator_haptic_resume(struct device *dev) |
| { |
| struct platform_device *pdev = to_platform_device(dev); |
| struct regulator_haptic *haptic = platform_get_drvdata(pdev); |
| unsigned int magnitude; |
| |
| mutex_lock(&haptic->mutex); |
| |
| haptic->suspended = false; |
| |
| magnitude = READ_ONCE(haptic->magnitude); |
| if (magnitude) |
| regulator_haptic_set_voltage(haptic, magnitude); |
| |
| mutex_unlock(&haptic->mutex); |
| |
| return 0; |
| } |
| |
| static SIMPLE_DEV_PM_OPS(regulator_haptic_pm_ops, |
| regulator_haptic_suspend, regulator_haptic_resume); |
| |
| static const struct of_device_id regulator_haptic_dt_match[] = { |
| { .compatible = "regulator-haptic" }, |
| { /* sentinel */ }, |
| }; |
| MODULE_DEVICE_TABLE(of, regulator_haptic_dt_match); |
| |
| static struct platform_driver regulator_haptic_driver = { |
| .probe = regulator_haptic_probe, |
| .driver = { |
| .name = "regulator-haptic", |
| .of_match_table = regulator_haptic_dt_match, |
| .pm = ®ulator_haptic_pm_ops, |
| }, |
| }; |
| module_platform_driver(regulator_haptic_driver); |
| |
| MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>"); |
| MODULE_AUTHOR("Hyunhee Kim <hyunhee.kim@samsung.com>"); |
| MODULE_DESCRIPTION("Regulator haptic driver"); |
| MODULE_LICENSE("GPL"); |
