drivers/input/misc/max8997_haptic.c - maze/linux - Git at Google

 /*
  * MAX8997-haptic controller driver
  *
  * Copyright (C) 2012 Samsung Electronics
  * Donggeun Kim <dg77.kim@samsung.com>
  *
  * This program is not provided / owned by Maxim Integrated Products.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
  */

 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/platform_device.h>
 #include <linux/err.h>
 #include <linux/pwm.h>
 #include <linux/input.h>
 #include <linux/mfd/max8997-private.h>
 #include <linux/mfd/max8997.h>
 #include <linux/regulator/consumer.h>

 /* Haptic configuration 2 register */
 #define MAX8997_MOTOR_TYPE_SHIFT	7
 #define MAX8997_ENABLE_SHIFT		6
 #define MAX8997_MODE_SHIFT		5

 /* Haptic driver configuration register */
 #define MAX8997_CYCLE_SHIFT		6
 #define MAX8997_SIG_PERIOD_SHIFT	4
 #define MAX8997_SIG_DUTY_SHIFT		2
 #define MAX8997_PWM_DUTY_SHIFT		0

 struct max8997_haptic {
 	struct device *dev;
 	struct i2c_client *client;
 	struct input_dev *input_dev;
 	struct regulator *regulator;

 	struct work_struct work;
 	struct mutex mutex;

 	bool enabled;
 	unsigned int level;

 	struct pwm_device *pwm;
 	unsigned int pwm_period;
 	enum max8997_haptic_pwm_divisor pwm_divisor;

 	enum max8997_haptic_motor_type type;
 	enum max8997_haptic_pulse_mode mode;

 	unsigned int internal_mode_pattern;
 	unsigned int pattern_cycle;
 	unsigned int pattern_signal_period;
 };

 static int max8997_haptic_set_duty_cycle(struct max8997_haptic *chip)
 {
 	int ret = 0;

 	if (chip->mode == MAX8997_EXTERNAL_MODE) {
 		unsigned int duty = chip->pwm_period * chip->level / 100;
 		ret = pwm_config(chip->pwm, duty, chip->pwm_period);
 	} else {
 		int i;
 		u8 duty_index = 0;

 		for (i = 0; i <= 64; i++) {
 			if (chip->level <= i * 100 / 64) {
 				duty_index = i;
 				break;
 			}
 		}
 		switch (chip->internal_mode_pattern) {
 		case 0:
 			max8997_write_reg(chip->client,
 				MAX8997_HAPTIC_REG_SIGPWMDC1, duty_index);
 			break;
 		case 1:
 			max8997_write_reg(chip->client,
 				MAX8997_HAPTIC_REG_SIGPWMDC2, duty_index);
 			break;
 		case 2:
 			max8997_write_reg(chip->client,
 				MAX8997_HAPTIC_REG_SIGPWMDC3, duty_index);
 			break;
 		case 3:
 			max8997_write_reg(chip->client,
 				MAX8997_HAPTIC_REG_SIGPWMDC4, duty_index);
 			break;
 		default:
 			break;
 		}
 	}
 	return ret;
 }

 static void max8997_haptic_configure(struct max8997_haptic *chip)
 {
 	u8 value;

 	value = chip->type << MAX8997_MOTOR_TYPE_SHIFT |
 		chip->enabled << MAX8997_ENABLE_SHIFT |
 		chip->mode << MAX8997_MODE_SHIFT | chip->pwm_divisor;
 	max8997_write_reg(chip->client, MAX8997_HAPTIC_REG_CONF2, value);

 	if (chip->mode == MAX8997_INTERNAL_MODE && chip->enabled) {
 		value = chip->internal_mode_pattern << MAX8997_CYCLE_SHIFT |
 			chip->internal_mode_pattern << MAX8997_SIG_PERIOD_SHIFT |
 			chip->internal_mode_pattern << MAX8997_SIG_DUTY_SHIFT |
 			chip->internal_mode_pattern << MAX8997_PWM_DUTY_SHIFT;
 		max8997_write_reg(chip->client,
 			MAX8997_HAPTIC_REG_DRVCONF, value);

 		switch (chip->internal_mode_pattern) {
 		case 0:
 			value = chip->pattern_cycle << 4;
 			max8997_write_reg(chip->client,
 				MAX8997_HAPTIC_REG_CYCLECONF1, value);
 			value = chip->pattern_signal_period;
 			max8997_write_reg(chip->client,
 				MAX8997_HAPTIC_REG_SIGCONF1, value);
 			break;

 		case 1:
 			value = chip->pattern_cycle;
 			max8997_write_reg(chip->client,
 				MAX8997_HAPTIC_REG_CYCLECONF1, value);
 			value = chip->pattern_signal_period;
 			max8997_write_reg(chip->client,
 				MAX8997_HAPTIC_REG_SIGCONF2, value);
 			break;

 		case 2:
 			value = chip->pattern_cycle << 4;
 			max8997_write_reg(chip->client,
 				MAX8997_HAPTIC_REG_CYCLECONF2, value);
 			value = chip->pattern_signal_period;
 			max8997_write_reg(chip->client,
 				MAX8997_HAPTIC_REG_SIGCONF3, value);
 			break;

 		case 3:
 			value = chip->pattern_cycle;
 			max8997_write_reg(chip->client,
 				MAX8997_HAPTIC_REG_CYCLECONF2, value);
 			value = chip->pattern_signal_period;
 			max8997_write_reg(chip->client,
 				MAX8997_HAPTIC_REG_SIGCONF4, value);
 			break;

 		default:
 			break;
 		}
 	}
 }

 static void max8997_haptic_enable(struct max8997_haptic *chip)
 {
 	int error;

 	mutex_lock(&chip->mutex);

 	error = max8997_haptic_set_duty_cycle(chip);
 	if (error) {
 		dev_err(chip->dev, "set_pwm_cycle failed, error: %d\n", error);
 		goto out;
 	}

 	if (!chip->enabled) {
 		chip->enabled = true;
 		regulator_enable(chip->regulator);
 		max8997_haptic_configure(chip);
 		if (chip->mode == MAX8997_EXTERNAL_MODE)
 			pwm_enable(chip->pwm);
 	}

 out:
 	mutex_unlock(&chip->mutex);
 }

 static void max8997_haptic_disable(struct max8997_haptic *chip)
 {
 	mutex_lock(&chip->mutex);

 	if (chip->enabled) {
 		chip->enabled = false;
 		max8997_haptic_configure(chip);
 		if (chip->mode == MAX8997_EXTERNAL_MODE)
 			pwm_disable(chip->pwm);
 		regulator_disable(chip->regulator);
 	}

 	mutex_unlock(&chip->mutex);
 }

 static void max8997_haptic_play_effect_work(struct work_struct *work)
 {
 	struct max8997_haptic *chip =
 			container_of(work, struct max8997_haptic, work);

 	if (chip->level)
 		max8997_haptic_enable(chip);
 	else
 		max8997_haptic_disable(chip);
 }

 static int max8997_haptic_play_effect(struct input_dev *dev, void *data,
 				  struct ff_effect *effect)
 {
 	struct max8997_haptic *chip = input_get_drvdata(dev);

 	chip->level = effect->u.rumble.strong_magnitude;
 	if (!chip->level)
 		chip->level = effect->u.rumble.weak_magnitude;

 	schedule_work(&chip->work);

 	return 0;
 }

 static void max8997_haptic_close(struct input_dev *dev)
 {
 	struct max8997_haptic *chip = input_get_drvdata(dev);

 	cancel_work_sync(&chip->work);
 	max8997_haptic_disable(chip);
 }

 static int max8997_haptic_probe(struct platform_device *pdev)
 {
 	struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 	const struct max8997_platform_data *pdata =
 					dev_get_platdata(iodev->dev);
 	const struct max8997_haptic_platform_data *haptic_pdata =
 					pdata->haptic_pdata;
 	struct max8997_haptic *chip;
 	struct input_dev *input_dev;
 	int error;

 	if (!haptic_pdata) {
 		dev_err(&pdev->dev, "no haptic platform data\n");
 		return -EINVAL;
 	}

 	chip = kzalloc(sizeof(struct max8997_haptic), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!chip || !input_dev) {
 		dev_err(&pdev->dev, "unable to allocate memory\n");
 		error = -ENOMEM;
 		goto err_free_mem;
 	}

 	INIT_WORK(&chip->work, max8997_haptic_play_effect_work);
 	mutex_init(&chip->mutex);

 	chip->client = iodev->haptic;
 	chip->dev = &pdev->dev;
 	chip->input_dev = input_dev;
 	chip->pwm_period = haptic_pdata->pwm_period;
 	chip->type = haptic_pdata->type;
 	chip->mode = haptic_pdata->mode;
 	chip->pwm_divisor = haptic_pdata->pwm_divisor;

 	switch (chip->mode) {
 	case MAX8997_INTERNAL_MODE:
 		chip->internal_mode_pattern =
 				haptic_pdata->internal_mode_pattern;
 		chip->pattern_cycle = haptic_pdata->pattern_cycle;
 		chip->pattern_signal_period =
 				haptic_pdata->pattern_signal_period;
 		break;

 	case MAX8997_EXTERNAL_MODE:
 		chip->pwm = pwm_request(haptic_pdata->pwm_channel_id,
 					"max8997-haptic");
 		if (IS_ERR(chip->pwm)) {
 			error = PTR_ERR(chip->pwm);
 			dev_err(&pdev->dev,
 				"unable to request PWM for haptic, error: %d\n",
 				error);
 			goto err_free_mem;
 		}
 		break;

 	default:
 		dev_err(&pdev->dev,
 			"Invalid chip mode specified (%d)\n", chip->mode);
 		error = -EINVAL;
 		goto err_free_mem;
 	}

 	chip->regulator = regulator_get(&pdev->dev, "inmotor");
 	if (IS_ERR(chip->regulator)) {
 		error = PTR_ERR(chip->regulator);
 		dev_err(&pdev->dev,
 			"unable to get regulator, error: %d\n",
 			error);
 		goto err_free_pwm;
 	}

 	input_dev->name = "max8997-haptic";
 	input_dev->id.version = 1;
 	input_dev->dev.parent = &pdev->dev;
 	input_dev->close = max8997_haptic_close;
 	input_set_drvdata(input_dev, chip);
 	input_set_capability(input_dev, EV_FF, FF_RUMBLE);

 	error = input_ff_create_memless(input_dev, NULL,
 				max8997_haptic_play_effect);
 	if (error) {
 		dev_err(&pdev->dev,
 			"unable to create FF device, error: %d\n",
 			error);
 		goto err_put_regulator;
 	}

 	error = input_register_device(input_dev);
 	if (error) {
 		dev_err(&pdev->dev,
 			"unable to register input device, error: %d\n",
 			error);
 		goto err_destroy_ff;
 	}

 	platform_set_drvdata(pdev, chip);
 	return 0;

 err_destroy_ff:
 	input_ff_destroy(input_dev);
 err_put_regulator:
 	regulator_put(chip->regulator);
 err_free_pwm:
 	if (chip->mode == MAX8997_EXTERNAL_MODE)
 		pwm_free(chip->pwm);
 err_free_mem:
 	input_free_device(input_dev);
 	kfree(chip);

 	return error;
 }

 static int max8997_haptic_remove(struct platform_device *pdev)
 {
 	struct max8997_haptic *chip = platform_get_drvdata(pdev);

 	input_unregister_device(chip->input_dev);
 	regulator_put(chip->regulator);

 	if (chip->mode == MAX8997_EXTERNAL_MODE)
 		pwm_free(chip->pwm);

 	kfree(chip);

 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static int max8997_haptic_suspend(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct max8997_haptic *chip = platform_get_drvdata(pdev);

 	max8997_haptic_disable(chip);

 	return 0;
 }
 #endif

 static SIMPLE_DEV_PM_OPS(max8997_haptic_pm_ops, max8997_haptic_suspend, NULL);

 static const struct platform_device_id max8997_haptic_id[] = {
 	{ "max8997-haptic", 0 },
 	{ },
 };
 MODULE_DEVICE_TABLE(i2c, max8997_haptic_id);

 static struct platform_driver max8997_haptic_driver = {
 	.driver	= {
 		.name	= "max8997-haptic",
 		.owner	= THIS_MODULE,
 		.pm	= &max8997_haptic_pm_ops,
 	},
 	.probe		= max8997_haptic_probe,
 	.remove		= max8997_haptic_remove,
 	.id_table	= max8997_haptic_id,
 };
 module_platform_driver(max8997_haptic_driver);

 MODULE_ALIAS("platform:max8997-haptic");
 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
 MODULE_DESCRIPTION("max8997_haptic driver");
 MODULE_LICENSE("GPL");
	/*
	* MAX8997-haptic controller driver
	*
	* Copyright (C) 2012 Samsung Electronics
	* Donggeun Kim <dg77.kim@samsung.com>
	*
	* This program is not provided / owned by Maxim Integrated Products.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*
	*/

	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/platform_device.h>
	#include <linux/err.h>
	#include <linux/pwm.h>
	#include <linux/input.h>
	#include <linux/mfd/max8997-private.h>
	#include <linux/mfd/max8997.h>
	#include <linux/regulator/consumer.h>

	/* Haptic configuration 2 register */
	#define MAX8997_MOTOR_TYPE_SHIFT 7
	#define MAX8997_ENABLE_SHIFT 6
	#define MAX8997_MODE_SHIFT 5

	/* Haptic driver configuration register */
	#define MAX8997_CYCLE_SHIFT 6
	#define MAX8997_SIG_PERIOD_SHIFT 4
	#define MAX8997_SIG_DUTY_SHIFT 2
	#define MAX8997_PWM_DUTY_SHIFT 0

	struct max8997_haptic {
	struct device *dev;
	struct i2c_client *client;
	struct input_dev *input_dev;
	struct regulator *regulator;

	struct work_struct work;
	struct mutex mutex;

	bool enabled;
	unsigned int level;

	struct pwm_device *pwm;
	unsigned int pwm_period;
	enum max8997_haptic_pwm_divisor pwm_divisor;

	enum max8997_haptic_motor_type type;
	enum max8997_haptic_pulse_mode mode;

	unsigned int internal_mode_pattern;
	unsigned int pattern_cycle;
	unsigned int pattern_signal_period;
	};

	static int max8997_haptic_set_duty_cycle(struct max8997_haptic *chip)
	{
	int ret = 0;

	if (chip->mode == MAX8997_EXTERNAL_MODE) {
	unsigned int duty = chip->pwm_period * chip->level / 100;
	ret = pwm_config(chip->pwm, duty, chip->pwm_period);
	} else {
	int i;
	u8 duty_index = 0;

	for (i = 0; i <= 64; i++) {
	if (chip->level <= i * 100 / 64) {
	duty_index = i;
	break;
	}
	}
	switch (chip->internal_mode_pattern) {
	case 0:
	max8997_write_reg(chip->client,
	MAX8997_HAPTIC_REG_SIGPWMDC1, duty_index);
	break;
	case 1:
	max8997_write_reg(chip->client,
	MAX8997_HAPTIC_REG_SIGPWMDC2, duty_index);
	break;
	case 2:
	max8997_write_reg(chip->client,
	MAX8997_HAPTIC_REG_SIGPWMDC3, duty_index);
	break;
	case 3:
	max8997_write_reg(chip->client,
	MAX8997_HAPTIC_REG_SIGPWMDC4, duty_index);
	break;
	default:
	break;
	}
	}
	return ret;
	}

	static void max8997_haptic_configure(struct max8997_haptic *chip)
	{
	u8 value;

	value = chip->type << MAX8997_MOTOR_TYPE_SHIFT \|
	chip->enabled << MAX8997_ENABLE_SHIFT \|
	chip->mode << MAX8997_MODE_SHIFT \| chip->pwm_divisor;
	max8997_write_reg(chip->client, MAX8997_HAPTIC_REG_CONF2, value);

	if (chip->mode == MAX8997_INTERNAL_MODE && chip->enabled) {
	value = chip->internal_mode_pattern << MAX8997_CYCLE_SHIFT \|
	chip->internal_mode_pattern << MAX8997_SIG_PERIOD_SHIFT \|
	chip->internal_mode_pattern << MAX8997_SIG_DUTY_SHIFT \|
	chip->internal_mode_pattern << MAX8997_PWM_DUTY_SHIFT;
	max8997_write_reg(chip->client,
	MAX8997_HAPTIC_REG_DRVCONF, value);

	switch (chip->internal_mode_pattern) {
	case 0:
	value = chip->pattern_cycle << 4;
	max8997_write_reg(chip->client,
	MAX8997_HAPTIC_REG_CYCLECONF1, value);
	value = chip->pattern_signal_period;
	max8997_write_reg(chip->client,
	MAX8997_HAPTIC_REG_SIGCONF1, value);
	break;

	case 1:
	value = chip->pattern_cycle;
	max8997_write_reg(chip->client,
	MAX8997_HAPTIC_REG_CYCLECONF1, value);
	value = chip->pattern_signal_period;
	max8997_write_reg(chip->client,
	MAX8997_HAPTIC_REG_SIGCONF2, value);
	break;

	case 2:
	value = chip->pattern_cycle << 4;
	max8997_write_reg(chip->client,
	MAX8997_HAPTIC_REG_CYCLECONF2, value);
	value = chip->pattern_signal_period;
	max8997_write_reg(chip->client,
	MAX8997_HAPTIC_REG_SIGCONF3, value);
	break;

	case 3:
	value = chip->pattern_cycle;
	max8997_write_reg(chip->client,
	MAX8997_HAPTIC_REG_CYCLECONF2, value);
	value = chip->pattern_signal_period;
	max8997_write_reg(chip->client,
	MAX8997_HAPTIC_REG_SIGCONF4, value);
	break;

	default:
	break;
	}
	}
	}

	static void max8997_haptic_enable(struct max8997_haptic *chip)
	{
	int error;

	mutex_lock(&chip->mutex);

	error = max8997_haptic_set_duty_cycle(chip);
	if (error) {
	dev_err(chip->dev, "set_pwm_cycle failed, error: %d\n", error);
	goto out;
	}

	if (!chip->enabled) {
	chip->enabled = true;
	regulator_enable(chip->regulator);
	max8997_haptic_configure(chip);
	if (chip->mode == MAX8997_EXTERNAL_MODE)
	pwm_enable(chip->pwm);
	}

	out:
	mutex_unlock(&chip->mutex);
	}

	static void max8997_haptic_disable(struct max8997_haptic *chip)
	{
	mutex_lock(&chip->mutex);

	if (chip->enabled) {
	chip->enabled = false;
	max8997_haptic_configure(chip);
	if (chip->mode == MAX8997_EXTERNAL_MODE)
	pwm_disable(chip->pwm);
	regulator_disable(chip->regulator);
	}

	mutex_unlock(&chip->mutex);
	}

	static void max8997_haptic_play_effect_work(struct work_struct *work)
	{
	struct max8997_haptic *chip =
	container_of(work, struct max8997_haptic, work);

	if (chip->level)
	max8997_haptic_enable(chip);
	else
	max8997_haptic_disable(chip);
	}

	static int max8997_haptic_play_effect(struct input_dev dev, void data,
	struct ff_effect *effect)
	{
	struct max8997_haptic *chip = input_get_drvdata(dev);

	chip->level = effect->u.rumble.strong_magnitude;
	if (!chip->level)
	chip->level = effect->u.rumble.weak_magnitude;

	schedule_work(&chip->work);

	return 0;
	}

	static void max8997_haptic_close(struct input_dev *dev)
	{
	struct max8997_haptic *chip = input_get_drvdata(dev);

	cancel_work_sync(&chip->work);
	max8997_haptic_disable(chip);
	}

	static int max8997_haptic_probe(struct platform_device *pdev)
	{
	struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	const struct max8997_platform_data *pdata =
	dev_get_platdata(iodev->dev);
	const struct max8997_haptic_platform_data *haptic_pdata =
	pdata->haptic_pdata;
	struct max8997_haptic *chip;
	struct input_dev *input_dev;
	int error;

	if (!haptic_pdata) {
	dev_err(&pdev->dev, "no haptic platform data\n");
	return -EINVAL;
	}

	chip = kzalloc(sizeof(struct max8997_haptic), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!chip \|\| !input_dev) {
	dev_err(&pdev->dev, "unable to allocate memory\n");
	error = -ENOMEM;
	goto err_free_mem;
	}

	INIT_WORK(&chip->work, max8997_haptic_play_effect_work);
	mutex_init(&chip->mutex);

	chip->client = iodev->haptic;
	chip->dev = &pdev->dev;
	chip->input_dev = input_dev;
	chip->pwm_period = haptic_pdata->pwm_period;
	chip->type = haptic_pdata->type;
	chip->mode = haptic_pdata->mode;
	chip->pwm_divisor = haptic_pdata->pwm_divisor;

	switch (chip->mode) {
	case MAX8997_INTERNAL_MODE:
	chip->internal_mode_pattern =
	haptic_pdata->internal_mode_pattern;
	chip->pattern_cycle = haptic_pdata->pattern_cycle;
	chip->pattern_signal_period =
	haptic_pdata->pattern_signal_period;
	break;

	case MAX8997_EXTERNAL_MODE:
	chip->pwm = pwm_request(haptic_pdata->pwm_channel_id,
	"max8997-haptic");
	if (IS_ERR(chip->pwm)) {
	error = PTR_ERR(chip->pwm);
	dev_err(&pdev->dev,
	"unable to request PWM for haptic, error: %d\n",
	error);
	goto err_free_mem;
	}
	break;

	default:
	dev_err(&pdev->dev,
	"Invalid chip mode specified (%d)\n", chip->mode);
	error = -EINVAL;
	goto err_free_mem;
	}

	chip->regulator = regulator_get(&pdev->dev, "inmotor");
	if (IS_ERR(chip->regulator)) {
	error = PTR_ERR(chip->regulator);
	dev_err(&pdev->dev,
	"unable to get regulator, error: %d\n",
	error);
	goto err_free_pwm;
	}

	input_dev->name = "max8997-haptic";
	input_dev->id.version = 1;
	input_dev->dev.parent = &pdev->dev;
	input_dev->close = max8997_haptic_close;
	input_set_drvdata(input_dev, chip);
	input_set_capability(input_dev, EV_FF, FF_RUMBLE);

	error = input_ff_create_memless(input_dev, NULL,
	max8997_haptic_play_effect);
	if (error) {
	dev_err(&pdev->dev,
	"unable to create FF device, error: %d\n",
	error);
	goto err_put_regulator;
	}

	error = input_register_device(input_dev);
	if (error) {
	dev_err(&pdev->dev,
	"unable to register input device, error: %d\n",
	error);
	goto err_destroy_ff;
	}

	platform_set_drvdata(pdev, chip);
	return 0;

	err_destroy_ff:
	input_ff_destroy(input_dev);
	err_put_regulator:
	regulator_put(chip->regulator);
	err_free_pwm:
	if (chip->mode == MAX8997_EXTERNAL_MODE)
	pwm_free(chip->pwm);
	err_free_mem:
	input_free_device(input_dev);
	kfree(chip);

	return error;
	}

	static int max8997_haptic_remove(struct platform_device *pdev)
	{
	struct max8997_haptic *chip = platform_get_drvdata(pdev);

	input_unregister_device(chip->input_dev);
	regulator_put(chip->regulator);

	if (chip->mode == MAX8997_EXTERNAL_MODE)
	pwm_free(chip->pwm);

	kfree(chip);

	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static int max8997_haptic_suspend(struct device *dev)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct max8997_haptic *chip = platform_get_drvdata(pdev);

	max8997_haptic_disable(chip);

	return 0;
	}
	#endif

	static SIMPLE_DEV_PM_OPS(max8997_haptic_pm_ops, max8997_haptic_suspend, NULL);

	static const struct platform_device_id max8997_haptic_id[] = {
	{ "max8997-haptic", 0 },
	{ },
	};
	MODULE_DEVICE_TABLE(i2c, max8997_haptic_id);

	static struct platform_driver max8997_haptic_driver = {
	.driver = {
	.name = "max8997-haptic",
	.owner = THIS_MODULE,
	.pm = &max8997_haptic_pm_ops,
	},
	.probe = max8997_haptic_probe,
	.remove = max8997_haptic_remove,
	.id_table = max8997_haptic_id,
	};
	module_platform_driver(max8997_haptic_driver);

	MODULE_ALIAS("platform:max8997-haptic");
	MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
	MODULE_DESCRIPTION("max8997_haptic driver");
	MODULE_LICENSE("GPL");