drivers/input/misc/pm8xxx-vibrator.c - linux - Git at Google

 /* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
  * only version 2 as published by the Free Software Foundation.
  *
  * 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.
  */

 #include <linux/errno.h>
 #include <linux/input.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>

 #define VIB_MAX_LEVEL_mV	(3100)
 #define VIB_MIN_LEVEL_mV	(1200)
 #define VIB_MAX_LEVELS		(VIB_MAX_LEVEL_mV - VIB_MIN_LEVEL_mV)

 #define MAX_FF_SPEED		0xff

 struct pm8xxx_regs {
 	unsigned int enable_addr;
 	unsigned int enable_mask;

 	unsigned int drv_addr;
 	unsigned int drv_mask;
 	unsigned int drv_shift;
 	unsigned int drv_en_manual_mask;
 };

 static const struct pm8xxx_regs pm8058_regs = {
 	.drv_addr = 0x4A,
 	.drv_mask = 0xf8,
 	.drv_shift = 3,
 	.drv_en_manual_mask = 0xfc,
 };

 static struct pm8xxx_regs pm8916_regs = {
 	.enable_addr = 0xc046,
 	.enable_mask = BIT(7),
 	.drv_addr = 0xc041,
 	.drv_mask = 0x1F,
 	.drv_shift = 0,
 	.drv_en_manual_mask = 0,
 };

 /**
  * struct pm8xxx_vib - structure to hold vibrator data
  * @vib_input_dev: input device supporting force feedback
  * @work: work structure to set the vibration parameters
  * @regmap: regmap for register read/write
  * @regs: registers' info
  * @speed: speed of vibration set from userland
  * @active: state of vibrator
  * @level: level of vibration to set in the chip
  * @reg_vib_drv: regs->drv_addr register value
  */
 struct pm8xxx_vib {
 	struct input_dev *vib_input_dev;
 	struct work_struct work;
 	struct regmap *regmap;
 	const struct pm8xxx_regs *regs;
 	int speed;
 	int level;
 	bool active;
 	u8  reg_vib_drv;
 };

 /**
  * pm8xxx_vib_set - handler to start/stop vibration
  * @vib: pointer to vibrator structure
  * @on: state to set
  */
 static int pm8xxx_vib_set(struct pm8xxx_vib *vib, bool on)
 {
 	int rc;
 	unsigned int val = vib->reg_vib_drv;
 	const struct pm8xxx_regs *regs = vib->regs;

 	if (on)
 		val |= (vib->level << regs->drv_shift) & regs->drv_mask;
 	else
 		val &= ~regs->drv_mask;

 	rc = regmap_write(vib->regmap, regs->drv_addr, val);
 	if (rc < 0)
 		return rc;

 	vib->reg_vib_drv = val;

 	if (regs->enable_mask)
 		rc = regmap_update_bits(vib->regmap, regs->enable_addr,
 					on ? regs->enable_mask : 0, val);

 	return rc;
 }

 /**
  * pm8xxx_work_handler - worker to set vibration level
  * @work: pointer to work_struct
  */
 static void pm8xxx_work_handler(struct work_struct *work)
 {
 	struct pm8xxx_vib *vib = container_of(work, struct pm8xxx_vib, work);
 	const struct pm8xxx_regs *regs = vib->regs;
 	int rc;
 	unsigned int val;

 	rc = regmap_read(vib->regmap, regs->drv_addr, &val);
 	if (rc < 0)
 		return;

 	/*
 	 * pmic vibrator supports voltage ranges from 1.2 to 3.1V, so
 	 * scale the level to fit into these ranges.
 	 */
 	if (vib->speed) {
 		vib->active = true;
 		vib->level = ((VIB_MAX_LEVELS * vib->speed) / MAX_FF_SPEED) +
 						VIB_MIN_LEVEL_mV;
 		vib->level /= 100;
 	} else {
 		vib->active = false;
 		vib->level = VIB_MIN_LEVEL_mV / 100;
 	}

 	pm8xxx_vib_set(vib, vib->active);
 }

 /**
  * pm8xxx_vib_close - callback of input close callback
  * @dev: input device pointer
  *
  * Turns off the vibrator.
  */
 static void pm8xxx_vib_close(struct input_dev *dev)
 {
 	struct pm8xxx_vib *vib = input_get_drvdata(dev);

 	cancel_work_sync(&vib->work);
 	if (vib->active)
 		pm8xxx_vib_set(vib, false);
 }

 /**
  * pm8xxx_vib_play_effect - function to handle vib effects.
  * @dev: input device pointer
  * @data: data of effect
  * @effect: effect to play
  *
  * Currently this driver supports only rumble effects.
  */
 static int pm8xxx_vib_play_effect(struct input_dev *dev, void *data,
 				  struct ff_effect *effect)
 {
 	struct pm8xxx_vib *vib = input_get_drvdata(dev);

 	vib->speed = effect->u.rumble.strong_magnitude >> 8;
 	if (!vib->speed)
 		vib->speed = effect->u.rumble.weak_magnitude >> 9;

 	schedule_work(&vib->work);

 	return 0;
 }

 static int pm8xxx_vib_probe(struct platform_device *pdev)
 {
 	struct pm8xxx_vib *vib;
 	struct input_dev *input_dev;
 	int error;
 	unsigned int val;
 	const struct pm8xxx_regs *regs;

 	vib = devm_kzalloc(&pdev->dev, sizeof(*vib), GFP_KERNEL);
 	if (!vib)
 		return -ENOMEM;

 	vib->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 	if (!vib->regmap)
 		return -ENODEV;

 	input_dev = devm_input_allocate_device(&pdev->dev);
 	if (!input_dev)
 		return -ENOMEM;

 	INIT_WORK(&vib->work, pm8xxx_work_handler);
 	vib->vib_input_dev = input_dev;

 	regs = of_device_get_match_data(&pdev->dev);

 	/* operate in manual mode */
 	error = regmap_read(vib->regmap, regs->drv_addr, &val);
 	if (error < 0)
 		return error;

 	val &= regs->drv_en_manual_mask;
 	error = regmap_write(vib->regmap, regs->drv_addr, val);
 	if (error < 0)
 		return error;

 	vib->regs = regs;
 	vib->reg_vib_drv = val;

 	input_dev->name = "pm8xxx_vib_ffmemless";
 	input_dev->id.version = 1;
 	input_dev->close = pm8xxx_vib_close;
 	input_set_drvdata(input_dev, vib);
 	input_set_capability(vib->vib_input_dev, EV_FF, FF_RUMBLE);

 	error = input_ff_create_memless(input_dev, NULL,
 					pm8xxx_vib_play_effect);
 	if (error) {
 		dev_err(&pdev->dev,
 			"couldn't register vibrator as FF device\n");
 		return error;
 	}

 	error = input_register_device(input_dev);
 	if (error) {
 		dev_err(&pdev->dev, "couldn't register input device\n");
 		return error;
 	}

 	platform_set_drvdata(pdev, vib);
 	return 0;
 }

 static int __maybe_unused pm8xxx_vib_suspend(struct device *dev)
 {
 	struct pm8xxx_vib *vib = dev_get_drvdata(dev);

 	/* Turn off the vibrator */
 	pm8xxx_vib_set(vib, false);

 	return 0;
 }

 static SIMPLE_DEV_PM_OPS(pm8xxx_vib_pm_ops, pm8xxx_vib_suspend, NULL);

 static const struct of_device_id pm8xxx_vib_id_table[] = {
 	{ .compatible = "qcom,pm8058-vib", .data = &pm8058_regs },
 	{ .compatible = "qcom,pm8921-vib", .data = &pm8058_regs },
 	{ .compatible = "qcom,pm8916-vib", .data = &pm8916_regs },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, pm8xxx_vib_id_table);

 static struct platform_driver pm8xxx_vib_driver = {
 	.probe		= pm8xxx_vib_probe,
 	.driver		= {
 		.name	= "pm8xxx-vib",
 		.pm	= &pm8xxx_vib_pm_ops,
 		.of_match_table = pm8xxx_vib_id_table,
 	},
 };
 module_platform_driver(pm8xxx_vib_driver);

 MODULE_ALIAS("platform:pm8xxx_vib");
 MODULE_DESCRIPTION("PMIC8xxx vibrator driver based on ff-memless framework");
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Amy Maloche <amaloche@codeaurora.org>");
	/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 and
	* only version 2 as published by the Free Software Foundation.
	*
	* 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.
	*/

	#include <linux/errno.h>
	#include <linux/input.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_device.h>
	#include <linux/platform_device.h>
	#include <linux/regmap.h>
	#include <linux/slab.h>

	#define VIB_MAX_LEVEL_mV (3100)
	#define VIB_MIN_LEVEL_mV (1200)
	#define VIB_MAX_LEVELS (VIB_MAX_LEVEL_mV - VIB_MIN_LEVEL_mV)

	#define MAX_FF_SPEED 0xff

	struct pm8xxx_regs {
	unsigned int enable_addr;
	unsigned int enable_mask;

	unsigned int drv_addr;
	unsigned int drv_mask;
	unsigned int drv_shift;
	unsigned int drv_en_manual_mask;
	};

	static const struct pm8xxx_regs pm8058_regs = {
	.drv_addr = 0x4A,
	.drv_mask = 0xf8,
	.drv_shift = 3,
	.drv_en_manual_mask = 0xfc,
	};

	static struct pm8xxx_regs pm8916_regs = {
	.enable_addr = 0xc046,
	.enable_mask = BIT(7),
	.drv_addr = 0xc041,
	.drv_mask = 0x1F,
	.drv_shift = 0,
	.drv_en_manual_mask = 0,
	};

	/**
	* struct pm8xxx_vib - structure to hold vibrator data
	* @vib_input_dev: input device supporting force feedback
	* @work: work structure to set the vibration parameters
	* @regmap: regmap for register read/write
	* @regs: registers' info
	* @speed: speed of vibration set from userland
	* @active: state of vibrator
	* @level: level of vibration to set in the chip
	* @reg_vib_drv: regs->drv_addr register value
	*/
	struct pm8xxx_vib {
	struct input_dev *vib_input_dev;
	struct work_struct work;
	struct regmap *regmap;
	const struct pm8xxx_regs *regs;
	int speed;
	int level;
	bool active;
	u8 reg_vib_drv;
	};

	/**
	* pm8xxx_vib_set - handler to start/stop vibration
	* @vib: pointer to vibrator structure
	* @on: state to set
	*/
	static int pm8xxx_vib_set(struct pm8xxx_vib *vib, bool on)
	{
	int rc;
	unsigned int val = vib->reg_vib_drv;
	const struct pm8xxx_regs *regs = vib->regs;

	if (on)
	val \|= (vib->level << regs->drv_shift) & regs->drv_mask;
	else
	val &= ~regs->drv_mask;

	rc = regmap_write(vib->regmap, regs->drv_addr, val);
	if (rc < 0)
	return rc;

	vib->reg_vib_drv = val;

	if (regs->enable_mask)
	rc = regmap_update_bits(vib->regmap, regs->enable_addr,
	on ? regs->enable_mask : 0, val);

	return rc;
	}

	/**
	* pm8xxx_work_handler - worker to set vibration level
	* @work: pointer to work_struct
	*/
	static void pm8xxx_work_handler(struct work_struct *work)
	{
	struct pm8xxx_vib *vib = container_of(work, struct pm8xxx_vib, work);
	const struct pm8xxx_regs *regs = vib->regs;
	int rc;
	unsigned int val;

	rc = regmap_read(vib->regmap, regs->drv_addr, &val);
	if (rc < 0)
	return;

	/*
	* pmic vibrator supports voltage ranges from 1.2 to 3.1V, so
	* scale the level to fit into these ranges.
	*/
	if (vib->speed) {
	vib->active = true;
	vib->level = ((VIB_MAX_LEVELS * vib->speed) / MAX_FF_SPEED) +
	VIB_MIN_LEVEL_mV;
	vib->level /= 100;
	} else {
	vib->active = false;
	vib->level = VIB_MIN_LEVEL_mV / 100;
	}

	pm8xxx_vib_set(vib, vib->active);
	}

	/**
	* pm8xxx_vib_close - callback of input close callback
	* @dev: input device pointer
	*
	* Turns off the vibrator.
	*/
	static void pm8xxx_vib_close(struct input_dev *dev)
	{
	struct pm8xxx_vib *vib = input_get_drvdata(dev);

	cancel_work_sync(&vib->work);
	if (vib->active)
	pm8xxx_vib_set(vib, false);
	}

	/**
	* pm8xxx_vib_play_effect - function to handle vib effects.
	* @dev: input device pointer
	* @data: data of effect
	* @effect: effect to play
	*
	* Currently this driver supports only rumble effects.
	*/
	static int pm8xxx_vib_play_effect(struct input_dev dev, void data,
	struct ff_effect *effect)
	{
	struct pm8xxx_vib *vib = input_get_drvdata(dev);

	vib->speed = effect->u.rumble.strong_magnitude >> 8;
	if (!vib->speed)
	vib->speed = effect->u.rumble.weak_magnitude >> 9;

	schedule_work(&vib->work);

	return 0;
	}

	static int pm8xxx_vib_probe(struct platform_device *pdev)
	{
	struct pm8xxx_vib *vib;
	struct input_dev *input_dev;
	int error;
	unsigned int val;
	const struct pm8xxx_regs *regs;

	vib = devm_kzalloc(&pdev->dev, sizeof(*vib), GFP_KERNEL);
	if (!vib)
	return -ENOMEM;

	vib->regmap = dev_get_regmap(pdev->dev.parent, NULL);
	if (!vib->regmap)
	return -ENODEV;

	input_dev = devm_input_allocate_device(&pdev->dev);
	if (!input_dev)
	return -ENOMEM;

	INIT_WORK(&vib->work, pm8xxx_work_handler);
	vib->vib_input_dev = input_dev;

	regs = of_device_get_match_data(&pdev->dev);

	/* operate in manual mode */
	error = regmap_read(vib->regmap, regs->drv_addr, &val);
	if (error < 0)
	return error;

	val &= regs->drv_en_manual_mask;
	error = regmap_write(vib->regmap, regs->drv_addr, val);
	if (error < 0)
	return error;

	vib->regs = regs;
	vib->reg_vib_drv = val;

	input_dev->name = "pm8xxx_vib_ffmemless";
	input_dev->id.version = 1;
	input_dev->close = pm8xxx_vib_close;
	input_set_drvdata(input_dev, vib);
	input_set_capability(vib->vib_input_dev, EV_FF, FF_RUMBLE);

	error = input_ff_create_memless(input_dev, NULL,
	pm8xxx_vib_play_effect);
	if (error) {
	dev_err(&pdev->dev,
	"couldn't register vibrator as FF device\n");
	return error;
	}

	error = input_register_device(input_dev);
	if (error) {
	dev_err(&pdev->dev, "couldn't register input device\n");
	return error;
	}

	platform_set_drvdata(pdev, vib);
	return 0;
	}

	static int __maybe_unused pm8xxx_vib_suspend(struct device *dev)
	{
	struct pm8xxx_vib *vib = dev_get_drvdata(dev);

	/* Turn off the vibrator */
	pm8xxx_vib_set(vib, false);

	return 0;
	}

	static SIMPLE_DEV_PM_OPS(pm8xxx_vib_pm_ops, pm8xxx_vib_suspend, NULL);

	static const struct of_device_id pm8xxx_vib_id_table[] = {
	{ .compatible = "qcom,pm8058-vib", .data = &pm8058_regs },
	{ .compatible = "qcom,pm8921-vib", .data = &pm8058_regs },
	{ .compatible = "qcom,pm8916-vib", .data = &pm8916_regs },
	{ }
	};
	MODULE_DEVICE_TABLE(of, pm8xxx_vib_id_table);

	static struct platform_driver pm8xxx_vib_driver = {
	.probe = pm8xxx_vib_probe,
	.driver = {
	.name = "pm8xxx-vib",
	.pm = &pm8xxx_vib_pm_ops,
	.of_match_table = pm8xxx_vib_id_table,
	},
	};
	module_platform_driver(pm8xxx_vib_driver);

	MODULE_ALIAS("platform:pm8xxx_vib");
	MODULE_DESCRIPTION("PMIC8xxx vibrator driver based on ff-memless framework");
	MODULE_LICENSE("GPL v2");
	MODULE_AUTHOR("Amy Maloche <amaloche@codeaurora.org>");