Input: add regulator haptic driver (d64cb71b) · Commits · e / devices / android_kernel_teracube_emerald

Documentation/devicetree/bindings/input/regulator-haptic.txt

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			* Regulator Haptic Device Tree Bindings

			Required Properties:
			- compatible : Should be "regulator-haptic"
			- haptic-supply : Power supply to the haptic motor.
			[*] refer Documentation/devicetree/bindings/regulator/regulator.txt

			- max-microvolt : The maximum voltage value supplied to the haptic motor.
			[The unit of the voltage is a micro]

			- min-microvolt : The minimum voltage value supplied to the haptic motor.
			[The unit of the voltage is a micro]

			Example:

			haptics {
			compatible = "regulator-haptic";
			haptic-supply = <&motor_regulator>;
			max-microvolt = <2700000>;
			min-microvolt = <1100000>;
			};

drivers/input/misc/Kconfig

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	@@ -394,6 +394,18 @@ config INPUT_CM109
	To compile this driver as a module, choose M here: the module will be		To compile this driver as a module, choose M here: the module will be
	called cm109.		called cm109.

			config INPUT_REGULATOR_HAPTIC
			tristate "Regulator haptics support"
			depends on REGULATOR
			select INPUT_FF_MEMLESS
			help
			This option enables device driver support for the haptic controlled
			by a regulator. This driver supports ff-memless interface
			from input framework.

			To compile this driver as a module, choose M here: the
			module will be called regulator-haptic.

	config INPUT_RETU_PWRBUTTON		config INPUT_RETU_PWRBUTTON
	tristate "Retu Power button Driver"		tristate "Retu Power button Driver"
	depends on MFD_RETU		depends on MFD_RETU

drivers/input/misc/Makefile

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	@@ -53,6 +53,7 @@ obj-$(CONFIG_INPUT_PMIC8XXX_PWRKEY) += pmic8xxx-pwrkey.o
	obj-$(CONFIG_INPUT_POWERMATE) += powermate.o		obj-$(CONFIG_INPUT_POWERMATE) += powermate.o
	obj-$(CONFIG_INPUT_PWM_BEEPER) += pwm-beeper.o		obj-$(CONFIG_INPUT_PWM_BEEPER) += pwm-beeper.o
	obj-$(CONFIG_INPUT_RB532_BUTTON) += rb532_button.o		obj-$(CONFIG_INPUT_RB532_BUTTON) += rb532_button.o
			obj-$(CONFIG_INPUT_REGULATOR_HAPTIC) += regulator-haptic.o
	obj-$(CONFIG_INPUT_RETU_PWRBUTTON) += retu-pwrbutton.o		obj-$(CONFIG_INPUT_RETU_PWRBUTTON) += retu-pwrbutton.o
	obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER) += rotary_encoder.o		obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER) += rotary_encoder.o
	obj-$(CONFIG_INPUT_SGI_BTNS) += sgi_btns.o		obj-$(CONFIG_INPUT_SGI_BTNS) += sgi_btns.o

drivers/input/misc/regulator-haptic.c

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			/*
			* 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;
			}

			return 0;
			}

			static void regulator_haptic_work(struct work_struct *work)
			{
			struct regulator_haptic *haptic = container_of(work,
			struct regulator_haptic, work);
			unsigned int magnitude;
			int error;

			mutex_lock(&haptic->mutex);

			if (haptic->suspended)
			goto out;

			magnitude = ACCESS_ONCE(haptic->magnitude);

			error = regulator_haptic_set_voltage(haptic, magnitude);
			if (error)
			goto out;

			regulator_haptic_toggle(haptic, magnitude != 0);

			out:
			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);
			regulator_haptic_toggle(haptic, false);
			}

			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 dveice 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);
			regulator_haptic_toggle(haptic, false);

			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 = ACCESS_ONCE(haptic->magnitude);
			if (magnitude) {
			regulator_haptic_set_voltage(haptic, magnitude);
			regulator_haptic_toggle(haptic, true);
			}

			mutex_unlock(&haptic->mutex);

			return 0;
			}

			static SIMPLE_DEV_PM_OPS(regulator_haptic_pm_ops,
			regulator_haptic_suspend, regulator_haptic_resume);

			static struct of_device_id regulator_haptic_dt_match[] = {
			{ .compatible = "regulator-haptic" },
			{ /* sentinel */ },
			};

			static struct platform_driver regulator_haptic_driver = {
			.probe = regulator_haptic_probe,
			.driver = {
			.name = "regulator-haptic",
			.of_match_table = regulator_haptic_dt_match,
			.pm = &regulator_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");

include/linux/platform_data/regulator-haptic.h

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			/*
			* Regulator Haptic Platform Data
			*
			* 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.
			*/

			#ifndef _REGULATOR_HAPTIC_H
			#define _REGULATOR_HAPTIC_H

			/*
			* struct regulator_haptic_data - Platform device data
			*
			* @max_volt: maximum voltage value supplied to the haptic motor.
			* <The unit of the voltage is a micro>
			* @min_volt: minimum voltage value supplied to the haptic motor.
			* <The unit of the voltage is a micro>
			*/
			struct regulator_haptic_data {
			unsigned int max_volt;
			unsigned int min_volt;
			};

			#endif /* _REGULATOR_HAPTIC_H */