drivers/input/touchscreen/88pm860x-ts.c - kernel/msm-4.9 - Gitiles

 /*
  * Touchscreen driver for Marvell 88PM860x
  *
  * Copyright (C) 2009 Marvell International Ltd.
  * 	Haojian Zhuang <haojian.zhuang@marvell.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/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/i2c.h>
 #include <linux/input.h>
 #include <linux/mfd/88pm860x.h>
 #include <linux/slab.h>

 #define MEAS_LEN		(8)
 #define ACCURATE_BIT		(12)

 /* touch register */
 #define MEAS_EN3		(0x52)

 #define MEAS_TSIX_1		(0x8D)
 #define MEAS_TSIX_2		(0x8E)
 #define MEAS_TSIY_1		(0x8F)
 #define MEAS_TSIY_2		(0x90)
 #define MEAS_TSIZ1_1		(0x91)
 #define MEAS_TSIZ1_2		(0x92)
 #define MEAS_TSIZ2_1		(0x93)
 #define MEAS_TSIZ2_2		(0x94)

 /* bit definitions of touch */
 #define MEAS_PD_EN		(1 << 3)
 #define MEAS_TSIX_EN		(1 << 4)
 #define MEAS_TSIY_EN		(1 << 5)
 #define MEAS_TSIZ1_EN		(1 << 6)
 #define MEAS_TSIZ2_EN		(1 << 7)

 struct pm860x_touch {
 	struct input_dev *idev;
 	struct i2c_client *i2c;
 	struct pm860x_chip *chip;
 	int irq;
 	int res_x;		/* resistor of Xplate */
 };

 static irqreturn_t pm860x_touch_handler(int irq, void *data)
 {
 	struct pm860x_touch *touch = data;
 	struct pm860x_chip *chip = touch->chip;
 	unsigned char buf[MEAS_LEN];
 	int x, y, pen_down;
 	int z1, z2, rt = 0;
 	int ret;

 	ret = pm860x_bulk_read(touch->i2c, MEAS_TSIX_1, MEAS_LEN, buf);
 	if (ret < 0)
 		goto out;

 	pen_down = buf[1] & (1 << 6);
 	x = ((buf[0] & 0xFF) << 4) | (buf[1] & 0x0F);
 	y = ((buf[2] & 0xFF) << 4) | (buf[3] & 0x0F);
 	z1 = ((buf[4] & 0xFF) << 4) | (buf[5] & 0x0F);
 	z2 = ((buf[6] & 0xFF) << 4) | (buf[7] & 0x0F);

 	if (pen_down) {
 		if ((x != 0) && (z1 != 0) && (touch->res_x != 0)) {
 			rt = z2 / z1 - 1;
 			rt = (rt * touch->res_x * x) >> ACCURATE_BIT;
 			dev_dbg(chip->dev, "z1:%d, z2:%d, rt:%d\n",
 				z1, z2, rt);
 		}
 		input_report_abs(touch->idev, ABS_X, x);
 		input_report_abs(touch->idev, ABS_Y, y);
 		input_report_abs(touch->idev, ABS_PRESSURE, rt);
 		input_report_key(touch->idev, BTN_TOUCH, 1);
 		dev_dbg(chip->dev, "pen down at [%d, %d].\n", x, y);
 	} else {
 		input_report_abs(touch->idev, ABS_PRESSURE, 0);
 		input_report_key(touch->idev, BTN_TOUCH, 0);
 		dev_dbg(chip->dev, "pen release\n");
 	}
 	input_sync(touch->idev);

 out:
 	return IRQ_HANDLED;
 }

 static int pm860x_touch_open(struct input_dev *dev)
 {
 	struct pm860x_touch *touch = input_get_drvdata(dev);
 	int data, ret;

 	data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN
 		| MEAS_TSIZ1_EN | MEAS_TSIZ2_EN;
 	ret = pm860x_set_bits(touch->i2c, MEAS_EN3, data, data);
 	if (ret < 0)
 		goto out;
 	return 0;
 out:
 	return ret;
 }

 static void pm860x_touch_close(struct input_dev *dev)
 {
 	struct pm860x_touch *touch = input_get_drvdata(dev);
 	int data;

 	data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN
 		| MEAS_TSIZ1_EN | MEAS_TSIZ2_EN;
 	pm860x_set_bits(touch->i2c, MEAS_EN3, data, 0);
 }

 #ifdef CONFIG_OF
 static int pm860x_touch_dt_init(struct platform_device *pdev,
 					  struct pm860x_chip *chip,
 					  int *res_x)
 {
 	struct device_node *np = pdev->dev.parent->of_node;
 	struct i2c_client *i2c = (chip->id == CHIP_PM8607) ? chip->client \
 				 : chip->companion;
 	int data, n, ret;
 	if (!np)
 		return -ENODEV;
 	np = of_find_node_by_name(np, "touch");
 	if (!np) {
 		dev_err(&pdev->dev, "Can't find touch node\n");
 		return -EINVAL;
 	}
 	/* set GPADC MISC1 register */
 	data = 0;
 	if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-prebias", &n))
 		data |= (n << 1) & PM8607_GPADC_PREBIAS_MASK;
 	if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-slot-cycle", &n))
 		data |= (n << 3) & PM8607_GPADC_SLOT_CYCLE_MASK;
 	if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-off-scale", &n))
 		data |= (n << 5) & PM8607_GPADC_OFF_SCALE_MASK;
 	if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-sw-cal", &n))
 		data |= (n << 7) & PM8607_GPADC_SW_CAL_MASK;
 	if (data) {
 		ret = pm860x_reg_write(i2c, PM8607_GPADC_MISC1, data);
 		if (ret < 0)
 			return -EINVAL;
 	}
 	/* set tsi prebias time */
 	if (!of_property_read_u32(np, "marvell,88pm860x-tsi-prebias", &data)) {
 		ret = pm860x_reg_write(i2c, PM8607_TSI_PREBIAS, data);
 		if (ret < 0)
 			return -EINVAL;
 	}
 	/* set prebias & prechg time of pen detect */
 	data = 0;
 	if (!of_property_read_u32(np, "marvell,88pm860x-pen-prebias", &n))
 		data |= n & PM8607_PD_PREBIAS_MASK;
 	if (!of_property_read_u32(np, "marvell,88pm860x-pen-prechg", &n))
 		data |= n & PM8607_PD_PRECHG_MASK;
 	if (data) {
 		ret = pm860x_reg_write(i2c, PM8607_PD_PREBIAS, data);
 		if (ret < 0)
 			return -EINVAL;
 	}
 	of_property_read_u32(np, "marvell,88pm860x-resistor-X", res_x);
 	return 0;
 }
 #else
 #define pm860x_touch_dt_init(x, y, z)	(-1)
 #endif

 static int pm860x_touch_probe(struct platform_device *pdev)
 {
 	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
 	struct pm860x_touch_pdata *pdata = pdev->dev.platform_data;
 	struct pm860x_touch *touch;
 	struct i2c_client *i2c = (chip->id == CHIP_PM8607) ? chip->client \
 				 : chip->companion;
 	int irq, ret, res_x = 0, data = 0;

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
 		dev_err(&pdev->dev, "No IRQ resource!\n");
 		return -EINVAL;
 	}

 	if (pm860x_touch_dt_init(pdev, chip, &res_x)) {
 		if (pdata) {
 			/* set GPADC MISC1 register */
 			data = 0;
 			data |= (pdata->gpadc_prebias << 1)
 				& PM8607_GPADC_PREBIAS_MASK;
 			data |= (pdata->slot_cycle << 3)
 				& PM8607_GPADC_SLOT_CYCLE_MASK;
 			data |= (pdata->off_scale << 5)
 				& PM8607_GPADC_OFF_SCALE_MASK;
 			data |= (pdata->sw_cal << 7)
 				& PM8607_GPADC_SW_CAL_MASK;
 			if (data) {
 				ret = pm860x_reg_write(i2c,
 					PM8607_GPADC_MISC1, data);
 				if (ret < 0)
 					return -EINVAL;
 			}
 			/* set tsi prebias time */
 			if (pdata->tsi_prebias) {
 				data = pdata->tsi_prebias;
 				ret = pm860x_reg_write(i2c,
 					PM8607_TSI_PREBIAS, data);
 				if (ret < 0)
 					return -EINVAL;
 			}
 			/* set prebias & prechg time of pen detect */
 			data = 0;
 			data |= pdata->pen_prebias
 				& PM8607_PD_PREBIAS_MASK;
 			data |= (pdata->pen_prechg << 5)
 				& PM8607_PD_PRECHG_MASK;
 			if (data) {
 				ret = pm860x_reg_write(i2c,
 					PM8607_PD_PREBIAS, data);
 				if (ret < 0)
 					return -EINVAL;
 			}
 			res_x = pdata->res_x;
 		} else {
 			dev_err(&pdev->dev, "failed to get platform data\n");
 			return -EINVAL;
 		}
 	}
 	/* enable GPADC */
 	ret = pm860x_set_bits(i2c, PM8607_GPADC_MISC1, PM8607_GPADC_EN,
 			      PM8607_GPADC_EN);
 	if (ret)
 		return ret;

 	touch = kzalloc(sizeof(struct pm860x_touch), GFP_KERNEL);
 	if (touch == NULL)
 		return -ENOMEM;
 	dev_set_drvdata(&pdev->dev, touch);

 	touch->idev = input_allocate_device();
 	if (touch->idev == NULL) {
 		dev_err(&pdev->dev, "Failed to allocate input device!\n");
 		ret = -ENOMEM;
 		goto out;
 	}

 	touch->idev->name = "88pm860x-touch";
 	touch->idev->phys = "88pm860x/input0";
 	touch->idev->id.bustype = BUS_I2C;
 	touch->idev->dev.parent = &pdev->dev;
 	touch->idev->open = pm860x_touch_open;
 	touch->idev->close = pm860x_touch_close;
 	touch->chip = chip;
 	touch->i2c = i2c;
 	touch->irq = irq;
 	touch->res_x = res_x;
 	input_set_drvdata(touch->idev, touch);

 	ret = request_threaded_irq(touch->irq, NULL, pm860x_touch_handler,
 				   IRQF_ONESHOT, "touch", touch);
 	if (ret < 0)
 		goto out_irq;

 	__set_bit(EV_ABS, touch->idev->evbit);
 	__set_bit(ABS_X, touch->idev->absbit);
 	__set_bit(ABS_Y, touch->idev->absbit);
 	__set_bit(ABS_PRESSURE, touch->idev->absbit);
 	__set_bit(EV_SYN, touch->idev->evbit);
 	__set_bit(EV_KEY, touch->idev->evbit);
 	__set_bit(BTN_TOUCH, touch->idev->keybit);

 	input_set_abs_params(touch->idev, ABS_X, 0, 1 << ACCURATE_BIT, 0, 0);
 	input_set_abs_params(touch->idev, ABS_Y, 0, 1 << ACCURATE_BIT, 0, 0);
 	input_set_abs_params(touch->idev, ABS_PRESSURE, 0, 1 << ACCURATE_BIT,
 				0, 0);

 	ret = input_register_device(touch->idev);
 	if (ret < 0) {
 		dev_err(chip->dev, "Failed to register touch!\n");
 		goto out_rg;
 	}

 	platform_set_drvdata(pdev, touch);
 	return 0;
 out_rg:
 	free_irq(touch->irq, touch);
 out_irq:
 	input_free_device(touch->idev);
 out:
 	kfree(touch);
 	return ret;
 }

 static int pm860x_touch_remove(struct platform_device *pdev)
 {
 	struct pm860x_touch *touch = platform_get_drvdata(pdev);

 	input_unregister_device(touch->idev);
 	free_irq(touch->irq, touch);
 	platform_set_drvdata(pdev, NULL);
 	kfree(touch);
 	return 0;
 }

 static struct platform_driver pm860x_touch_driver = {
 	.driver	= {
 		.name	= "88pm860x-touch",
 		.owner	= THIS_MODULE,
 	},
 	.probe	= pm860x_touch_probe,
 	.remove	= pm860x_touch_remove,
 };
 module_platform_driver(pm860x_touch_driver);

 MODULE_DESCRIPTION("Touchscreen driver for Marvell Semiconductor 88PM860x");
 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:88pm860x-touch");
	/*
	* Touchscreen driver for Marvell 88PM860x
	*
	* Copyright (C) 2009 Marvell International Ltd.
	* Haojian Zhuang <haojian.zhuang@marvell.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/kernel.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/platform_device.h>
	#include <linux/i2c.h>
	#include <linux/input.h>
	#include <linux/mfd/88pm860x.h>
	#include <linux/slab.h>

	#define MEAS_LEN (8)
	#define ACCURATE_BIT (12)

	/* touch register */
	#define MEAS_EN3 (0x52)

	#define MEAS_TSIX_1 (0x8D)
	#define MEAS_TSIX_2 (0x8E)
	#define MEAS_TSIY_1 (0x8F)
	#define MEAS_TSIY_2 (0x90)
	#define MEAS_TSIZ1_1 (0x91)
	#define MEAS_TSIZ1_2 (0x92)
	#define MEAS_TSIZ2_1 (0x93)
	#define MEAS_TSIZ2_2 (0x94)

	/* bit definitions of touch */
	#define MEAS_PD_EN (1 << 3)
	#define MEAS_TSIX_EN (1 << 4)
	#define MEAS_TSIY_EN (1 << 5)
	#define MEAS_TSIZ1_EN (1 << 6)
	#define MEAS_TSIZ2_EN (1 << 7)

	struct pm860x_touch {
	struct input_dev *idev;
	struct i2c_client *i2c;
	struct pm860x_chip *chip;
	int irq;
	int res_x; /* resistor of Xplate */
	};

	static irqreturn_t pm860x_touch_handler(int irq, void *data)
	{
	struct pm860x_touch *touch = data;
	struct pm860x_chip *chip = touch->chip;
	unsigned char buf[MEAS_LEN];
	int x, y, pen_down;
	int z1, z2, rt = 0;
	int ret;

	ret = pm860x_bulk_read(touch->i2c, MEAS_TSIX_1, MEAS_LEN, buf);
	if (ret < 0)
	goto out;

	pen_down = buf[1] & (1 << 6);
	x = ((buf[0] & 0xFF) << 4) \| (buf[1] & 0x0F);
	y = ((buf[2] & 0xFF) << 4) \| (buf[3] & 0x0F);
	z1 = ((buf[4] & 0xFF) << 4) \| (buf[5] & 0x0F);
	z2 = ((buf[6] & 0xFF) << 4) \| (buf[7] & 0x0F);

	if (pen_down) {
	if ((x != 0) && (z1 != 0) && (touch->res_x != 0)) {
	rt = z2 / z1 - 1;
	rt = (rt * touch->res_x * x) >> ACCURATE_BIT;
	dev_dbg(chip->dev, "z1:%d, z2:%d, rt:%d\n",
	z1, z2, rt);
	}
	input_report_abs(touch->idev, ABS_X, x);
	input_report_abs(touch->idev, ABS_Y, y);
	input_report_abs(touch->idev, ABS_PRESSURE, rt);
	input_report_key(touch->idev, BTN_TOUCH, 1);
	dev_dbg(chip->dev, "pen down at [%d, %d].\n", x, y);
	} else {
	input_report_abs(touch->idev, ABS_PRESSURE, 0);
	input_report_key(touch->idev, BTN_TOUCH, 0);
	dev_dbg(chip->dev, "pen release\n");
	}
	input_sync(touch->idev);

	out:
	return IRQ_HANDLED;
	}

	static int pm860x_touch_open(struct input_dev *dev)
	{
	struct pm860x_touch *touch = input_get_drvdata(dev);
	int data, ret;

	data = MEAS_PD_EN \| MEAS_TSIX_EN \| MEAS_TSIY_EN
	\| MEAS_TSIZ1_EN \| MEAS_TSIZ2_EN;
	ret = pm860x_set_bits(touch->i2c, MEAS_EN3, data, data);
	if (ret < 0)
	goto out;
	return 0;
	out:
	return ret;
	}

	static void pm860x_touch_close(struct input_dev *dev)
	{
	struct pm860x_touch *touch = input_get_drvdata(dev);
	int data;

	data = MEAS_PD_EN \| MEAS_TSIX_EN \| MEAS_TSIY_EN
	\| MEAS_TSIZ1_EN \| MEAS_TSIZ2_EN;
	pm860x_set_bits(touch->i2c, MEAS_EN3, data, 0);
	}

	#ifdef CONFIG_OF
	static int pm860x_touch_dt_init(struct platform_device *pdev,
	struct pm860x_chip *chip,
	int *res_x)
	{
	struct device_node *np = pdev->dev.parent->of_node;
	struct i2c_client *i2c = (chip->id == CHIP_PM8607) ? chip->client \
	: chip->companion;
	int data, n, ret;
	if (!np)
	return -ENODEV;
	np = of_find_node_by_name(np, "touch");
	if (!np) {
	dev_err(&pdev->dev, "Can't find touch node\n");
	return -EINVAL;
	}
	/* set GPADC MISC1 register */
	data = 0;
	if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-prebias", &n))
	data \|= (n << 1) & PM8607_GPADC_PREBIAS_MASK;
	if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-slot-cycle", &n))
	data \|= (n << 3) & PM8607_GPADC_SLOT_CYCLE_MASK;
	if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-off-scale", &n))
	data \|= (n << 5) & PM8607_GPADC_OFF_SCALE_MASK;
	if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-sw-cal", &n))
	data \|= (n << 7) & PM8607_GPADC_SW_CAL_MASK;
	if (data) {
	ret = pm860x_reg_write(i2c, PM8607_GPADC_MISC1, data);
	if (ret < 0)
	return -EINVAL;
	}
	/* set tsi prebias time */
	if (!of_property_read_u32(np, "marvell,88pm860x-tsi-prebias", &data)) {
	ret = pm860x_reg_write(i2c, PM8607_TSI_PREBIAS, data);
	if (ret < 0)
	return -EINVAL;
	}
	/* set prebias & prechg time of pen detect */
	data = 0;
	if (!of_property_read_u32(np, "marvell,88pm860x-pen-prebias", &n))
	data \|= n & PM8607_PD_PREBIAS_MASK;
	if (!of_property_read_u32(np, "marvell,88pm860x-pen-prechg", &n))
	data \|= n & PM8607_PD_PRECHG_MASK;
	if (data) {
	ret = pm860x_reg_write(i2c, PM8607_PD_PREBIAS, data);
	if (ret < 0)
	return -EINVAL;
	}
	of_property_read_u32(np, "marvell,88pm860x-resistor-X", res_x);
	return 0;
	}
	#else
	#define pm860x_touch_dt_init(x, y, z) (-1)
	#endif

	static int pm860x_touch_probe(struct platform_device *pdev)
	{
	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
	struct pm860x_touch_pdata *pdata = pdev->dev.platform_data;
	struct pm860x_touch *touch;
	struct i2c_client *i2c = (chip->id == CHIP_PM8607) ? chip->client \
	: chip->companion;
	int irq, ret, res_x = 0, data = 0;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
	dev_err(&pdev->dev, "No IRQ resource!\n");
	return -EINVAL;
	}

	if (pm860x_touch_dt_init(pdev, chip, &res_x)) {
	if (pdata) {
	/* set GPADC MISC1 register */
	data = 0;
	data \|= (pdata->gpadc_prebias << 1)
	& PM8607_GPADC_PREBIAS_MASK;
	data \|= (pdata->slot_cycle << 3)
	& PM8607_GPADC_SLOT_CYCLE_MASK;
	data \|= (pdata->off_scale << 5)
	& PM8607_GPADC_OFF_SCALE_MASK;
	data \|= (pdata->sw_cal << 7)
	& PM8607_GPADC_SW_CAL_MASK;
	if (data) {
	ret = pm860x_reg_write(i2c,
	PM8607_GPADC_MISC1, data);
	if (ret < 0)
	return -EINVAL;
	}
	/* set tsi prebias time */
	if (pdata->tsi_prebias) {
	data = pdata->tsi_prebias;
	ret = pm860x_reg_write(i2c,
	PM8607_TSI_PREBIAS, data);
	if (ret < 0)
	return -EINVAL;
	}
	/* set prebias & prechg time of pen detect */
	data = 0;
	data \|= pdata->pen_prebias
	& PM8607_PD_PREBIAS_MASK;
	data \|= (pdata->pen_prechg << 5)
	& PM8607_PD_PRECHG_MASK;
	if (data) {
	ret = pm860x_reg_write(i2c,
	PM8607_PD_PREBIAS, data);
	if (ret < 0)
	return -EINVAL;
	}
	res_x = pdata->res_x;
	} else {
	dev_err(&pdev->dev, "failed to get platform data\n");
	return -EINVAL;
	}
	}
	/* enable GPADC */
	ret = pm860x_set_bits(i2c, PM8607_GPADC_MISC1, PM8607_GPADC_EN,
	PM8607_GPADC_EN);
	if (ret)
	return ret;

	touch = kzalloc(sizeof(struct pm860x_touch), GFP_KERNEL);
	if (touch == NULL)
	return -ENOMEM;
	dev_set_drvdata(&pdev->dev, touch);

	touch->idev = input_allocate_device();
	if (touch->idev == NULL) {
	dev_err(&pdev->dev, "Failed to allocate input device!\n");
	ret = -ENOMEM;
	goto out;
	}

	touch->idev->name = "88pm860x-touch";
	touch->idev->phys = "88pm860x/input0";
	touch->idev->id.bustype = BUS_I2C;
	touch->idev->dev.parent = &pdev->dev;
	touch->idev->open = pm860x_touch_open;
	touch->idev->close = pm860x_touch_close;
	touch->chip = chip;
	touch->i2c = i2c;
	touch->irq = irq;
	touch->res_x = res_x;
	input_set_drvdata(touch->idev, touch);

	ret = request_threaded_irq(touch->irq, NULL, pm860x_touch_handler,
	IRQF_ONESHOT, "touch", touch);
	if (ret < 0)
	goto out_irq;

	__set_bit(EV_ABS, touch->idev->evbit);
	__set_bit(ABS_X, touch->idev->absbit);
	__set_bit(ABS_Y, touch->idev->absbit);
	__set_bit(ABS_PRESSURE, touch->idev->absbit);
	__set_bit(EV_SYN, touch->idev->evbit);
	__set_bit(EV_KEY, touch->idev->evbit);
	__set_bit(BTN_TOUCH, touch->idev->keybit);

	input_set_abs_params(touch->idev, ABS_X, 0, 1 << ACCURATE_BIT, 0, 0);
	input_set_abs_params(touch->idev, ABS_Y, 0, 1 << ACCURATE_BIT, 0, 0);
	input_set_abs_params(touch->idev, ABS_PRESSURE, 0, 1 << ACCURATE_BIT,
	0, 0);

	ret = input_register_device(touch->idev);
	if (ret < 0) {
	dev_err(chip->dev, "Failed to register touch!\n");
	goto out_rg;
	}

	platform_set_drvdata(pdev, touch);
	return 0;
	out_rg:
	free_irq(touch->irq, touch);
	out_irq:
	input_free_device(touch->idev);
	out:
	kfree(touch);
	return ret;
	}

	static int pm860x_touch_remove(struct platform_device *pdev)
	{
	struct pm860x_touch *touch = platform_get_drvdata(pdev);

	input_unregister_device(touch->idev);
	free_irq(touch->irq, touch);
	platform_set_drvdata(pdev, NULL);
	kfree(touch);
	return 0;
	}

	static struct platform_driver pm860x_touch_driver = {
	.driver = {
	.name = "88pm860x-touch",
	.owner = THIS_MODULE,
	},
	.probe = pm860x_touch_probe,
	.remove = pm860x_touch_remove,
	};
	module_platform_driver(pm860x_touch_driver);

	MODULE_DESCRIPTION("Touchscreen driver for Marvell Semiconductor 88PM860x");
	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:88pm860x-touch");