drivers/input/misc/twl4030-vibra.c - linux - Git at Google

 /*
  * twl4030-vibra.c - TWL4030 Vibrator driver
  *
  * Copyright (C) 2008-2010 Nokia Corporation
  *
  * Written by Henrik Saari <henrik.saari@nokia.com>
  * Updates by Felipe Balbi <felipe.balbi@nokia.com>
  * Input by Jari Vanhala <ext-jari.vanhala@nokia.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.
  *
  * 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., 51 Franklin St, Fifth Floor, Boston, MA
  * 02110-1301 USA
  *
  */

 #include <linux/module.h>
 #include <linux/jiffies.h>
 #include <linux/platform_device.h>
 #include <linux/of.h>
 #include <linux/workqueue.h>
 #include <linux/i2c/twl.h>
 #include <linux/mfd/twl4030-audio.h>
 #include <linux/input.h>
 #include <linux/slab.h>

 /* MODULE ID2 */
 #define LEDEN		0x00

 /* ForceFeedback */
 #define EFFECT_DIR_180_DEG	0x8000 /* range is 0 - 0xFFFF */

 struct vibra_info {
 	struct device		*dev;
 	struct input_dev	*input_dev;

 	struct work_struct	play_work;

 	bool			enabled;
 	int			speed;
 	int			direction;

 	bool			coexist;
 };

 static void vibra_disable_leds(void)
 {
 	u8 reg;

 	/* Disable LEDA & LEDB, cannot be used with vibra (PWM) */
 	twl_i2c_read_u8(TWL4030_MODULE_LED, &reg, LEDEN);
 	reg &= ~0x03;
 	twl_i2c_write_u8(TWL4030_MODULE_LED, LEDEN, reg);
 }

 /* Powers H-Bridge and enables audio clk */
 static void vibra_enable(struct vibra_info *info)
 {
 	u8 reg;

 	twl4030_audio_enable_resource(TWL4030_AUDIO_RES_POWER);

 	/* turn H-Bridge on */
 	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
 			&reg, TWL4030_REG_VIBRA_CTL);
 	twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
 			 (reg | TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL);

 	twl4030_audio_enable_resource(TWL4030_AUDIO_RES_APLL);

 	info->enabled = true;
 }

 static void vibra_disable(struct vibra_info *info)
 {
 	u8 reg;

 	/* Power down H-Bridge */
 	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
 			&reg, TWL4030_REG_VIBRA_CTL);
 	twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
 			 (reg & ~TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL);

 	twl4030_audio_disable_resource(TWL4030_AUDIO_RES_APLL);
 	twl4030_audio_disable_resource(TWL4030_AUDIO_RES_POWER);

 	info->enabled = false;
 }

 static void vibra_play_work(struct work_struct *work)
 {
 	struct vibra_info *info = container_of(work,
 			struct vibra_info, play_work);
 	int dir;
 	int pwm;
 	u8 reg;

 	dir = info->direction;
 	pwm = info->speed;

 	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
 			&reg, TWL4030_REG_VIBRA_CTL);
 	if (pwm && (!info->coexist || !(reg & TWL4030_VIBRA_SEL))) {

 		if (!info->enabled)
 			vibra_enable(info);

 		/* set vibra rotation direction */
 		twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
 				&reg, TWL4030_REG_VIBRA_CTL);
 		reg = (dir) ? (reg | TWL4030_VIBRA_DIR) :
 			(reg & ~TWL4030_VIBRA_DIR);
 		twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
 				 reg, TWL4030_REG_VIBRA_CTL);

 		/* set PWM, 1 = max, 255 = min */
 		twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
 				 256 - pwm, TWL4030_REG_VIBRA_SET);
 	} else {
 		if (info->enabled)
 			vibra_disable(info);
 	}
 }

 /*** Input/ForceFeedback ***/

 static int vibra_play(struct input_dev *input, void *data,
 		      struct ff_effect *effect)
 {
 	struct vibra_info *info = input_get_drvdata(input);

 	info->speed = effect->u.rumble.strong_magnitude >> 8;
 	if (!info->speed)
 		info->speed = effect->u.rumble.weak_magnitude >> 9;
 	info->direction = effect->direction < EFFECT_DIR_180_DEG ? 0 : 1;
 	schedule_work(&info->play_work);
 	return 0;
 }

 static void twl4030_vibra_close(struct input_dev *input)
 {
 	struct vibra_info *info = input_get_drvdata(input);

 	cancel_work_sync(&info->play_work);

 	if (info->enabled)
 		vibra_disable(info);
 }

 /*** Module ***/
 static int __maybe_unused twl4030_vibra_suspend(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct vibra_info *info = platform_get_drvdata(pdev);

 	if (info->enabled)
 		vibra_disable(info);

 	return 0;
 }

 static int __maybe_unused twl4030_vibra_resume(struct device *dev)
 {
 	vibra_disable_leds();
 	return 0;
 }

 static SIMPLE_DEV_PM_OPS(twl4030_vibra_pm_ops,
 			 twl4030_vibra_suspend, twl4030_vibra_resume);

 static bool twl4030_vibra_check_coexist(struct twl4030_vibra_data *pdata,
 			      struct device_node *node)
 {
 	if (pdata && pdata->coexist)
 		return true;

 	if (of_find_node_by_name(node, "codec")) {
 		of_node_put(node);
 		return true;
 	}

 	return false;
 }

 static int twl4030_vibra_probe(struct platform_device *pdev)
 {
 	struct twl4030_vibra_data *pdata = dev_get_platdata(&pdev->dev);
 	struct device_node *twl4030_core_node = pdev->dev.parent->of_node;
 	struct vibra_info *info;
 	int ret;

 	if (!pdata && !twl4030_core_node) {
 		dev_dbg(&pdev->dev, "platform_data not available\n");
 		return -EINVAL;
 	}

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

 	info->dev = &pdev->dev;
 	info->coexist = twl4030_vibra_check_coexist(pdata, twl4030_core_node);
 	INIT_WORK(&info->play_work, vibra_play_work);

 	info->input_dev = devm_input_allocate_device(&pdev->dev);
 	if (info->input_dev == NULL) {
 		dev_err(&pdev->dev, "couldn't allocate input device\n");
 		return -ENOMEM;
 	}

 	input_set_drvdata(info->input_dev, info);

 	info->input_dev->name = "twl4030:vibrator";
 	info->input_dev->id.version = 1;
 	info->input_dev->dev.parent = pdev->dev.parent;
 	info->input_dev->close = twl4030_vibra_close;
 	__set_bit(FF_RUMBLE, info->input_dev->ffbit);

 	ret = input_ff_create_memless(info->input_dev, NULL, vibra_play);
 	if (ret < 0) {
 		dev_dbg(&pdev->dev, "couldn't register vibrator to FF\n");
 		return ret;
 	}

 	ret = input_register_device(info->input_dev);
 	if (ret < 0) {
 		dev_dbg(&pdev->dev, "couldn't register input device\n");
 		goto err_iff;
 	}

 	vibra_disable_leds();

 	platform_set_drvdata(pdev, info);
 	return 0;

 err_iff:
 	input_ff_destroy(info->input_dev);
 	return ret;
 }

 static struct platform_driver twl4030_vibra_driver = {
 	.probe		= twl4030_vibra_probe,
 	.driver		= {
 		.name	= "twl4030-vibra",
 		.owner	= THIS_MODULE,
 		.pm	= &twl4030_vibra_pm_ops,
 	},
 };
 module_platform_driver(twl4030_vibra_driver);

 MODULE_ALIAS("platform:twl4030-vibra");
 MODULE_DESCRIPTION("TWL4030 Vibra driver");
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Nokia Corporation");
	/*
	* twl4030-vibra.c - TWL4030 Vibrator driver
	*
	* Copyright (C) 2008-2010 Nokia Corporation
	*
	* Written by Henrik Saari <henrik.saari@nokia.com>
	* Updates by Felipe Balbi <felipe.balbi@nokia.com>
	* Input by Jari Vanhala <ext-jari.vanhala@nokia.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.
	*
	* 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., 51 Franklin St, Fifth Floor, Boston, MA
	* 02110-1301 USA
	*
	*/

	#include <linux/module.h>
	#include <linux/jiffies.h>
	#include <linux/platform_device.h>
	#include <linux/of.h>
	#include <linux/workqueue.h>
	#include <linux/i2c/twl.h>
	#include <linux/mfd/twl4030-audio.h>
	#include <linux/input.h>
	#include <linux/slab.h>

	/* MODULE ID2 */
	#define LEDEN 0x00

	/* ForceFeedback */
	#define EFFECT_DIR_180_DEG 0x8000 /* range is 0 - 0xFFFF */

	struct vibra_info {
	struct device *dev;
	struct input_dev *input_dev;

	struct work_struct play_work;

	bool enabled;
	int speed;
	int direction;

	bool coexist;
	};

	static void vibra_disable_leds(void)
	{
	u8 reg;

	/* Disable LEDA & LEDB, cannot be used with vibra (PWM) */
	twl_i2c_read_u8(TWL4030_MODULE_LED, &reg, LEDEN);
	reg &= ~0x03;
	twl_i2c_write_u8(TWL4030_MODULE_LED, LEDEN, reg);
	}

	/* Powers H-Bridge and enables audio clk */
	static void vibra_enable(struct vibra_info *info)
	{
	u8 reg;

	twl4030_audio_enable_resource(TWL4030_AUDIO_RES_POWER);

	/* turn H-Bridge on */
	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
	&reg, TWL4030_REG_VIBRA_CTL);
	twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
	(reg \| TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL);

	twl4030_audio_enable_resource(TWL4030_AUDIO_RES_APLL);

	info->enabled = true;
	}

	static void vibra_disable(struct vibra_info *info)
	{
	u8 reg;

	/* Power down H-Bridge */
	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
	&reg, TWL4030_REG_VIBRA_CTL);
	twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
	(reg & ~TWL4030_VIBRA_EN), TWL4030_REG_VIBRA_CTL);

	twl4030_audio_disable_resource(TWL4030_AUDIO_RES_APLL);
	twl4030_audio_disable_resource(TWL4030_AUDIO_RES_POWER);

	info->enabled = false;
	}

	static void vibra_play_work(struct work_struct *work)
	{
	struct vibra_info *info = container_of(work,
	struct vibra_info, play_work);
	int dir;
	int pwm;
	u8 reg;

	dir = info->direction;
	pwm = info->speed;

	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
	&reg, TWL4030_REG_VIBRA_CTL);
	if (pwm && (!info->coexist \|\| !(reg & TWL4030_VIBRA_SEL))) {

	if (!info->enabled)
	vibra_enable(info);

	/* set vibra rotation direction */
	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE,
	&reg, TWL4030_REG_VIBRA_CTL);
	reg = (dir) ? (reg \| TWL4030_VIBRA_DIR) :
	(reg & ~TWL4030_VIBRA_DIR);
	twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
	reg, TWL4030_REG_VIBRA_CTL);

	/* set PWM, 1 = max, 255 = min */
	twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
	256 - pwm, TWL4030_REG_VIBRA_SET);
	} else {
	if (info->enabled)
	vibra_disable(info);
	}
	}

	/* Input/ForceFeedback */

	static int vibra_play(struct input_dev input, void data,
	struct ff_effect *effect)
	{
	struct vibra_info *info = input_get_drvdata(input);

	info->speed = effect->u.rumble.strong_magnitude >> 8;
	if (!info->speed)
	info->speed = effect->u.rumble.weak_magnitude >> 9;
	info->direction = effect->direction < EFFECT_DIR_180_DEG ? 0 : 1;
	schedule_work(&info->play_work);
	return 0;
	}

	static void twl4030_vibra_close(struct input_dev *input)
	{
	struct vibra_info *info = input_get_drvdata(input);

	cancel_work_sync(&info->play_work);

	if (info->enabled)
	vibra_disable(info);
	}

	/* Module */
	static int __maybe_unused twl4030_vibra_suspend(struct device *dev)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct vibra_info *info = platform_get_drvdata(pdev);

	if (info->enabled)
	vibra_disable(info);

	return 0;
	}

	static int __maybe_unused twl4030_vibra_resume(struct device *dev)
	{
	vibra_disable_leds();
	return 0;
	}

	static SIMPLE_DEV_PM_OPS(twl4030_vibra_pm_ops,
	twl4030_vibra_suspend, twl4030_vibra_resume);

	static bool twl4030_vibra_check_coexist(struct twl4030_vibra_data *pdata,
	struct device_node *node)
	{
	if (pdata && pdata->coexist)
	return true;

	if (of_find_node_by_name(node, "codec")) {
	of_node_put(node);
	return true;
	}

	return false;
	}

	static int twl4030_vibra_probe(struct platform_device *pdev)
	{
	struct twl4030_vibra_data *pdata = dev_get_platdata(&pdev->dev);
	struct device_node *twl4030_core_node = pdev->dev.parent->of_node;
	struct vibra_info *info;
	int ret;

	if (!pdata && !twl4030_core_node) {
	dev_dbg(&pdev->dev, "platform_data not available\n");
	return -EINVAL;
	}

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

	info->dev = &pdev->dev;
	info->coexist = twl4030_vibra_check_coexist(pdata, twl4030_core_node);
	INIT_WORK(&info->play_work, vibra_play_work);

	info->input_dev = devm_input_allocate_device(&pdev->dev);
	if (info->input_dev == NULL) {
	dev_err(&pdev->dev, "couldn't allocate input device\n");
	return -ENOMEM;
	}

	input_set_drvdata(info->input_dev, info);

	info->input_dev->name = "twl4030:vibrator";
	info->input_dev->id.version = 1;
	info->input_dev->dev.parent = pdev->dev.parent;
	info->input_dev->close = twl4030_vibra_close;
	__set_bit(FF_RUMBLE, info->input_dev->ffbit);

	ret = input_ff_create_memless(info->input_dev, NULL, vibra_play);
	if (ret < 0) {
	dev_dbg(&pdev->dev, "couldn't register vibrator to FF\n");
	return ret;
	}

	ret = input_register_device(info->input_dev);
	if (ret < 0) {
	dev_dbg(&pdev->dev, "couldn't register input device\n");
	goto err_iff;
	}

	vibra_disable_leds();

	platform_set_drvdata(pdev, info);
	return 0;

	err_iff:
	input_ff_destroy(info->input_dev);
	return ret;
	}

	static struct platform_driver twl4030_vibra_driver = {
	.probe = twl4030_vibra_probe,
	.driver = {
	.name = "twl4030-vibra",
	.owner = THIS_MODULE,
	.pm = &twl4030_vibra_pm_ops,
	},
	};
	module_platform_driver(twl4030_vibra_driver);

	MODULE_ALIAS("platform:twl4030-vibra");
	MODULE_DESCRIPTION("TWL4030 Vibra driver");
	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Nokia Corporation");