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264 lines
6.3 KiB
264 lines
6.3 KiB
// 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 <[email protected]> |
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* Author: Hyunhee Kim <[email protected]> |
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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 <[email protected]>"); |
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MODULE_AUTHOR("Hyunhee Kim <[email protected]>"); |
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MODULE_DESCRIPTION("Regulator haptic driver"); |
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MODULE_LICENSE("GPL");
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