drivers/input/touchscreen/tnetv107x-ts.c - kernel/mindspeed - Git at Google

 /*
  * Texas Instruments TNETV107X Touchscreen Driver
  *
  * Copyright (C) 2010 Texas Instruments
  *
  * 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 version 2.
  *
  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  * kind, whether express or implied; without even the implied warranty
  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/err.h>
 #include <linux/errno.h>
 #include <linux/input.h>
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/ctype.h>
 #include <linux/io.h>
 #include <linux/clk.h>

 #include <mach/tnetv107x.h>

 #define TSC_PENUP_POLL		(HZ / 5)
 #define IDLE_TIMEOUT		100 /* msec */

 /*
  * The first and last samples of a touch interval are usually garbage and need
  * to be filtered out with these devices.  The following definitions control
  * the number of samples skipped.
  */
 #define TSC_HEAD_SKIP		1
 #define TSC_TAIL_SKIP		1
 #define TSC_SKIP		(TSC_HEAD_SKIP + TSC_TAIL_SKIP + 1)
 #define TSC_SAMPLES		(TSC_SKIP + 1)

 /* Register Offsets */
 struct tsc_regs {
 	u32	rev;
 	u32	tscm;
 	u32	bwcm;
 	u32	swc;
 	u32	adcchnl;
 	u32	adcdata;
 	u32	chval[4];
 };

 /* TSC Mode Configuration Register (tscm) bits */
 #define WMODE		BIT(0)
 #define TSKIND		BIT(1)
 #define ZMEASURE_EN	BIT(2)
 #define IDLE		BIT(3)
 #define TSC_EN		BIT(4)
 #define STOP		BIT(5)
 #define ONE_SHOT	BIT(6)
 #define SINGLE		BIT(7)
 #define AVG		BIT(8)
 #define AVGNUM(x)	(((x) & 0x03) <<  9)
 #define PVSTC(x)	(((x) & 0x07) << 11)
 #define PON		BIT(14)
 #define PONBG		BIT(15)
 #define AFERST		BIT(16)

 /* ADC DATA Capture Register bits */
 #define DATA_VALID	BIT(16)

 /* Register Access Macros */
 #define tsc_read(ts, reg)		__raw_readl(&(ts)->regs->reg)
 #define tsc_write(ts, reg, val)		__raw_writel(val, &(ts)->regs->reg);
 #define tsc_set_bits(ts, reg, val)	\
 	tsc_write(ts, reg, tsc_read(ts, reg) | (val))
 #define tsc_clr_bits(ts, reg, val)	\
 	tsc_write(ts, reg, tsc_read(ts, reg) & ~(val))

 struct sample {
 	int x, y, p;
 };

 struct tsc_data {
 	struct input_dev		*input_dev;
 	struct resource			*res;
 	struct tsc_regs __iomem		*regs;
 	struct timer_list		timer;
 	spinlock_t			lock;
 	struct clk			*clk;
 	struct device			*dev;
 	int				sample_count;
 	struct sample			samples[TSC_SAMPLES];
 	int				tsc_irq;
 };

 static int tsc_read_sample(struct tsc_data *ts, struct sample* sample)
 {
 	int	x, y, z1, z2, t, p = 0;
 	u32	val;

 	val = tsc_read(ts, chval[0]);
 	if (val & DATA_VALID)
 		x = val & 0xffff;
 	else
 		return -EINVAL;

 	y  = tsc_read(ts, chval[1]) & 0xffff;
 	z1 = tsc_read(ts, chval[2]) & 0xffff;
 	z2 = tsc_read(ts, chval[3]) & 0xffff;

 	if (z1) {
 		t = ((600 * x) * (z2 - z1));
 		p = t / (u32) (z1 << 12);
 		if (p < 0)
 			p = 0;
 	}

 	sample->x  = x;
 	sample->y  = y;
 	sample->p  = p;

 	return 0;
 }

 static void tsc_poll(unsigned long data)
 {
 	struct tsc_data *ts = (struct tsc_data *)data;
 	unsigned long flags;
 	int i, val, x, y, p;

 	spin_lock_irqsave(&ts->lock, flags);

 	if (ts->sample_count >= TSC_SKIP) {
 		input_report_abs(ts->input_dev, ABS_PRESSURE, 0);
 		input_report_key(ts->input_dev, BTN_TOUCH, 0);
 		input_sync(ts->input_dev);
 	} else if (ts->sample_count > 0) {
 		/*
 		 * A touch event lasted less than our skip count.  Salvage and
 		 * report anyway.
 		 */
 		for (i = 0, val = 0; i < ts->sample_count; i++)
 			val += ts->samples[i].x;
 		x = val / ts->sample_count;

 		for (i = 0, val = 0; i < ts->sample_count; i++)
 			val += ts->samples[i].y;
 		y = val / ts->sample_count;

 		for (i = 0, val = 0; i < ts->sample_count; i++)
 			val += ts->samples[i].p;
 		p = val / ts->sample_count;

 		input_report_abs(ts->input_dev, ABS_X, x);
 		input_report_abs(ts->input_dev, ABS_Y, y);
 		input_report_abs(ts->input_dev, ABS_PRESSURE, p);
 		input_report_key(ts->input_dev, BTN_TOUCH, 1);
 		input_sync(ts->input_dev);
 	}

 	ts->sample_count = 0;

 	spin_unlock_irqrestore(&ts->lock, flags);
 }

 static irqreturn_t tsc_irq(int irq, void *dev_id)
 {
 	struct tsc_data *ts = (struct tsc_data *)dev_id;
 	struct sample *sample;
 	int index;

 	spin_lock(&ts->lock);

 	index = ts->sample_count % TSC_SAMPLES;
 	sample = &ts->samples[index];
 	if (tsc_read_sample(ts, sample) < 0)
 		goto out;

 	if (++ts->sample_count >= TSC_SKIP) {
 		index = (ts->sample_count - TSC_TAIL_SKIP - 1) % TSC_SAMPLES;
 		sample = &ts->samples[index];

 		input_report_abs(ts->input_dev, ABS_X, sample->x);
 		input_report_abs(ts->input_dev, ABS_Y, sample->y);
 		input_report_abs(ts->input_dev, ABS_PRESSURE, sample->p);
 		if (ts->sample_count == TSC_SKIP)
 			input_report_key(ts->input_dev, BTN_TOUCH, 1);
 		input_sync(ts->input_dev);
 	}
 	mod_timer(&ts->timer, jiffies + TSC_PENUP_POLL);
 out:
 	spin_unlock(&ts->lock);
 	return IRQ_HANDLED;
 }

 static int tsc_start(struct input_dev *dev)
 {
 	struct tsc_data *ts = input_get_drvdata(dev);
 	unsigned long timeout = jiffies + msecs_to_jiffies(IDLE_TIMEOUT);
 	u32 val;

 	clk_enable(ts->clk);

 	/* Go to idle mode, before any initialization */
 	while (time_after(timeout, jiffies)) {
 		if (tsc_read(ts, tscm) & IDLE)
 			break;
 	}

 	if (time_before(timeout, jiffies)) {
 		dev_warn(ts->dev, "timeout waiting for idle\n");
 		clk_disable(ts->clk);
 		return -EIO;
 	}

 	/* Configure TSC Control register*/
 	val = (PONBG | PON | PVSTC(4) | ONE_SHOT | ZMEASURE_EN);
 	tsc_write(ts, tscm, val);

 	/* Bring TSC out of reset: Clear AFE reset bit */
 	val &= ~(AFERST);
 	tsc_write(ts, tscm, val);

 	/* Configure all pins for hardware control*/
 	tsc_write(ts, bwcm, 0);

 	/* Finally enable the TSC */
 	tsc_set_bits(ts, tscm, TSC_EN);

 	return 0;
 }

 static void tsc_stop(struct input_dev *dev)
 {
 	struct tsc_data *ts = input_get_drvdata(dev);

 	tsc_clr_bits(ts, tscm, TSC_EN);
 	synchronize_irq(ts->tsc_irq);
 	del_timer_sync(&ts->timer);
 	clk_disable(ts->clk);
 }

 static int __devinit tsc_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct tsc_data *ts;
 	int error = 0;
 	u32 rev = 0;

 	ts = kzalloc(sizeof(struct tsc_data), GFP_KERNEL);
 	if (!ts) {
 		dev_err(dev, "cannot allocate device info\n");
 		return -ENOMEM;
 	}

 	ts->dev = dev;
 	spin_lock_init(&ts->lock);
 	setup_timer(&ts->timer, tsc_poll, (unsigned long)ts);
 	platform_set_drvdata(pdev, ts);

 	ts->tsc_irq = platform_get_irq(pdev, 0);
 	if (ts->tsc_irq < 0) {
 		dev_err(dev, "cannot determine device interrupt\n");
 		error = -ENODEV;
 		goto error_res;
 	}

 	ts->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!ts->res) {
 		dev_err(dev, "cannot determine register area\n");
 		error = -ENODEV;
 		goto error_res;
 	}

 	if (!request_mem_region(ts->res->start, resource_size(ts->res),
 				pdev->name)) {
 		dev_err(dev, "cannot claim register memory\n");
 		ts->res = NULL;
 		error = -EINVAL;
 		goto error_res;
 	}

 	ts->regs = ioremap(ts->res->start, resource_size(ts->res));
 	if (!ts->regs) {
 		dev_err(dev, "cannot map register memory\n");
 		error = -ENOMEM;
 		goto error_map;
 	}

 	ts->clk = clk_get(dev, NULL);
 	if (IS_ERR(ts->clk)) {
 		dev_err(dev, "cannot claim device clock\n");
 		error = PTR_ERR(ts->clk);
 		goto error_clk;
 	}

 	error = request_threaded_irq(ts->tsc_irq, NULL, tsc_irq, 0,
 				     dev_name(dev), ts);
 	if (error < 0) {
 		dev_err(ts->dev, "Could not allocate ts irq\n");
 		goto error_irq;
 	}

 	ts->input_dev = input_allocate_device();
 	if (!ts->input_dev) {
 		dev_err(dev, "cannot allocate input device\n");
 		error = -ENOMEM;
 		goto error_input;
 	}
 	input_set_drvdata(ts->input_dev, ts);

 	ts->input_dev->name       = pdev->name;
 	ts->input_dev->id.bustype = BUS_HOST;
 	ts->input_dev->dev.parent = &pdev->dev;
 	ts->input_dev->open	  = tsc_start;
 	ts->input_dev->close	  = tsc_stop;

 	clk_enable(ts->clk);
 	rev = tsc_read(ts, rev);
 	ts->input_dev->id.product = ((rev >>  8) & 0x07);
 	ts->input_dev->id.version = ((rev >> 16) & 0xfff);
 	clk_disable(ts->clk);

 	__set_bit(EV_KEY,    ts->input_dev->evbit);
 	__set_bit(EV_ABS,    ts->input_dev->evbit);
 	__set_bit(BTN_TOUCH, ts->input_dev->keybit);

 	input_set_abs_params(ts->input_dev, ABS_X, 0, 0xffff, 5, 0);
 	input_set_abs_params(ts->input_dev, ABS_Y, 0, 0xffff, 5, 0);
 	input_set_abs_params(ts->input_dev, ABS_PRESSURE, 0, 4095, 128, 0);

 	error = input_register_device(ts->input_dev);
 	if (error < 0) {
 		dev_err(dev, "failed input device registration\n");
 		goto error_reg;
 	}

 	return 0;

 error_reg:
 	input_free_device(ts->input_dev);
 error_input:
 	free_irq(ts->tsc_irq, ts);
 error_irq:
 	clk_put(ts->clk);
 error_clk:
 	iounmap(ts->regs);
 error_map:
 	release_mem_region(ts->res->start, resource_size(ts->res));
 error_res:
 	platform_set_drvdata(pdev, NULL);
 	kfree(ts);

 	return error;
 }

 static int __devexit tsc_remove(struct platform_device *pdev)
 {
 	struct tsc_data *ts = platform_get_drvdata(pdev);

 	input_unregister_device(ts->input_dev);
 	free_irq(ts->tsc_irq, ts);
 	clk_put(ts->clk);
 	iounmap(ts->regs);
 	release_mem_region(ts->res->start, resource_size(ts->res));
 	platform_set_drvdata(pdev, NULL);
 	kfree(ts);

 	return 0;
 }

 static struct platform_driver tsc_driver = {
 	.probe		= tsc_probe,
 	.remove		= __devexit_p(tsc_remove),
 	.driver.name	= "tnetv107x-ts",
 	.driver.owner	= THIS_MODULE,
 };

 static int __init tsc_init(void)
 {
 	return platform_driver_register(&tsc_driver);
 }

 static void __exit tsc_exit(void)
 {
 	platform_driver_unregister(&tsc_driver);
 }

 module_init(tsc_init);
 module_exit(tsc_exit);

 MODULE_AUTHOR("Cyril Chemparathy");
 MODULE_DESCRIPTION("TNETV107X Touchscreen Driver");
 MODULE_ALIAS("platform:tnetv107x-ts");
 MODULE_LICENSE("GPL");
	/*
	* Texas Instruments TNETV107X Touchscreen Driver
	*
	* Copyright (C) 2010 Texas Instruments
	*
	* 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 version 2.
	*
	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	* kind, whether express or implied; without even the implied warranty
	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/err.h>
	#include <linux/errno.h>
	#include <linux/input.h>
	#include <linux/platform_device.h>
	#include <linux/interrupt.h>
	#include <linux/slab.h>
	#include <linux/delay.h>
	#include <linux/ctype.h>
	#include <linux/io.h>
	#include <linux/clk.h>

	#include <mach/tnetv107x.h>

	#define TSC_PENUP_POLL (HZ / 5)
	#define IDLE_TIMEOUT 100 /* msec */

	/*
	* The first and last samples of a touch interval are usually garbage and need
	* to be filtered out with these devices. The following definitions control
	* the number of samples skipped.
	*/
	#define TSC_HEAD_SKIP 1
	#define TSC_TAIL_SKIP 1
	#define TSC_SKIP (TSC_HEAD_SKIP + TSC_TAIL_SKIP + 1)
	#define TSC_SAMPLES (TSC_SKIP + 1)

	/* Register Offsets */
	struct tsc_regs {
	u32 rev;
	u32 tscm;
	u32 bwcm;
	u32 swc;
	u32 adcchnl;
	u32 adcdata;
	u32 chval[4];
	};

	/* TSC Mode Configuration Register (tscm) bits */
	#define WMODE BIT(0)
	#define TSKIND BIT(1)
	#define ZMEASURE_EN BIT(2)
	#define IDLE BIT(3)
	#define TSC_EN BIT(4)
	#define STOP BIT(5)
	#define ONE_SHOT BIT(6)
	#define SINGLE BIT(7)
	#define AVG BIT(8)
	#define AVGNUM(x) (((x) & 0x03) << 9)
	#define PVSTC(x) (((x) & 0x07) << 11)
	#define PON BIT(14)
	#define PONBG BIT(15)
	#define AFERST BIT(16)

	/* ADC DATA Capture Register bits */
	#define DATA_VALID BIT(16)

	/* Register Access Macros */
	#define tsc_read(ts, reg) __raw_readl(&(ts)->regs->reg)
	#define tsc_write(ts, reg, val) __raw_writel(val, &(ts)->regs->reg);
	#define tsc_set_bits(ts, reg, val) \
	tsc_write(ts, reg, tsc_read(ts, reg) \| (val))
	#define tsc_clr_bits(ts, reg, val) \
	tsc_write(ts, reg, tsc_read(ts, reg) & ~(val))

	struct sample {
	int x, y, p;
	};

	struct tsc_data {
	struct input_dev *input_dev;
	struct resource *res;
	struct tsc_regs __iomem *regs;
	struct timer_list timer;
	spinlock_t lock;
	struct clk *clk;
	struct device *dev;
	int sample_count;
	struct sample samples[TSC_SAMPLES];
	int tsc_irq;
	};

	static int tsc_read_sample(struct tsc_data ts, struct sample sample)
	{
	int x, y, z1, z2, t, p = 0;
	u32 val;

	val = tsc_read(ts, chval[0]);
	if (val & DATA_VALID)
	x = val & 0xffff;
	else
	return -EINVAL;

	y = tsc_read(ts, chval[1]) & 0xffff;
	z1 = tsc_read(ts, chval[2]) & 0xffff;
	z2 = tsc_read(ts, chval[3]) & 0xffff;

	if (z1) {
	t = ((600 * x) * (z2 - z1));
	p = t / (u32) (z1 << 12);
	if (p < 0)
	p = 0;
	}

	sample->x = x;
	sample->y = y;
	sample->p = p;

	return 0;
	}

	static void tsc_poll(unsigned long data)
	{
	struct tsc_data ts = (struct tsc_data )data;
	unsigned long flags;
	int i, val, x, y, p;

	spin_lock_irqsave(&ts->lock, flags);

	if (ts->sample_count >= TSC_SKIP) {
	input_report_abs(ts->input_dev, ABS_PRESSURE, 0);
	input_report_key(ts->input_dev, BTN_TOUCH, 0);
	input_sync(ts->input_dev);
	} else if (ts->sample_count > 0) {
	/*
	* A touch event lasted less than our skip count. Salvage and
	* report anyway.
	*/
	for (i = 0, val = 0; i < ts->sample_count; i++)
	val += ts->samples[i].x;
	x = val / ts->sample_count;

	for (i = 0, val = 0; i < ts->sample_count; i++)
	val += ts->samples[i].y;
	y = val / ts->sample_count;

	for (i = 0, val = 0; i < ts->sample_count; i++)
	val += ts->samples[i].p;
	p = val / ts->sample_count;

	input_report_abs(ts->input_dev, ABS_X, x);
	input_report_abs(ts->input_dev, ABS_Y, y);
	input_report_abs(ts->input_dev, ABS_PRESSURE, p);
	input_report_key(ts->input_dev, BTN_TOUCH, 1);
	input_sync(ts->input_dev);
	}

	ts->sample_count = 0;

	spin_unlock_irqrestore(&ts->lock, flags);
	}

	static irqreturn_t tsc_irq(int irq, void *dev_id)
	{
	struct tsc_data ts = (struct tsc_data )dev_id;
	struct sample *sample;
	int index;

	spin_lock(&ts->lock);

	index = ts->sample_count % TSC_SAMPLES;
	sample = &ts->samples[index];
	if (tsc_read_sample(ts, sample) < 0)
	goto out;

	if (++ts->sample_count >= TSC_SKIP) {
	index = (ts->sample_count - TSC_TAIL_SKIP - 1) % TSC_SAMPLES;
	sample = &ts->samples[index];

	input_report_abs(ts->input_dev, ABS_X, sample->x);
	input_report_abs(ts->input_dev, ABS_Y, sample->y);
	input_report_abs(ts->input_dev, ABS_PRESSURE, sample->p);
	if (ts->sample_count == TSC_SKIP)
	input_report_key(ts->input_dev, BTN_TOUCH, 1);
	input_sync(ts->input_dev);
	}
	mod_timer(&ts->timer, jiffies + TSC_PENUP_POLL);
	out:
	spin_unlock(&ts->lock);
	return IRQ_HANDLED;
	}

	static int tsc_start(struct input_dev *dev)
	{
	struct tsc_data *ts = input_get_drvdata(dev);
	unsigned long timeout = jiffies + msecs_to_jiffies(IDLE_TIMEOUT);
	u32 val;

	clk_enable(ts->clk);

	/* Go to idle mode, before any initialization */
	while (time_after(timeout, jiffies)) {
	if (tsc_read(ts, tscm) & IDLE)
	break;
	}

	if (time_before(timeout, jiffies)) {
	dev_warn(ts->dev, "timeout waiting for idle\n");
	clk_disable(ts->clk);
	return -EIO;
	}

	/* Configure TSC Control register*/
	val = (PONBG \| PON \| PVSTC(4) \| ONE_SHOT \| ZMEASURE_EN);
	tsc_write(ts, tscm, val);

	/* Bring TSC out of reset: Clear AFE reset bit */
	val &= ~(AFERST);
	tsc_write(ts, tscm, val);

	/* Configure all pins for hardware control*/
	tsc_write(ts, bwcm, 0);

	/* Finally enable the TSC */
	tsc_set_bits(ts, tscm, TSC_EN);

	return 0;
	}

	static void tsc_stop(struct input_dev *dev)
	{
	struct tsc_data *ts = input_get_drvdata(dev);

	tsc_clr_bits(ts, tscm, TSC_EN);
	synchronize_irq(ts->tsc_irq);
	del_timer_sync(&ts->timer);
	clk_disable(ts->clk);
	}

	static int __devinit tsc_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct tsc_data *ts;
	int error = 0;
	u32 rev = 0;

	ts = kzalloc(sizeof(struct tsc_data), GFP_KERNEL);
	if (!ts) {
	dev_err(dev, "cannot allocate device info\n");
	return -ENOMEM;
	}

	ts->dev = dev;
	spin_lock_init(&ts->lock);
	setup_timer(&ts->timer, tsc_poll, (unsigned long)ts);
	platform_set_drvdata(pdev, ts);

	ts->tsc_irq = platform_get_irq(pdev, 0);
	if (ts->tsc_irq < 0) {
	dev_err(dev, "cannot determine device interrupt\n");
	error = -ENODEV;
	goto error_res;
	}

	ts->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!ts->res) {
	dev_err(dev, "cannot determine register area\n");
	error = -ENODEV;
	goto error_res;
	}

	if (!request_mem_region(ts->res->start, resource_size(ts->res),
	pdev->name)) {
	dev_err(dev, "cannot claim register memory\n");
	ts->res = NULL;
	error = -EINVAL;
	goto error_res;
	}

	ts->regs = ioremap(ts->res->start, resource_size(ts->res));
	if (!ts->regs) {
	dev_err(dev, "cannot map register memory\n");
	error = -ENOMEM;
	goto error_map;
	}

	ts->clk = clk_get(dev, NULL);
	if (IS_ERR(ts->clk)) {
	dev_err(dev, "cannot claim device clock\n");
	error = PTR_ERR(ts->clk);
	goto error_clk;
	}

	error = request_threaded_irq(ts->tsc_irq, NULL, tsc_irq, 0,
	dev_name(dev), ts);
	if (error < 0) {
	dev_err(ts->dev, "Could not allocate ts irq\n");
	goto error_irq;
	}

	ts->input_dev = input_allocate_device();
	if (!ts->input_dev) {
	dev_err(dev, "cannot allocate input device\n");
	error = -ENOMEM;
	goto error_input;
	}
	input_set_drvdata(ts->input_dev, ts);

	ts->input_dev->name = pdev->name;
	ts->input_dev->id.bustype = BUS_HOST;
	ts->input_dev->dev.parent = &pdev->dev;
	ts->input_dev->open = tsc_start;
	ts->input_dev->close = tsc_stop;

	clk_enable(ts->clk);
	rev = tsc_read(ts, rev);
	ts->input_dev->id.product = ((rev >> 8) & 0x07);
	ts->input_dev->id.version = ((rev >> 16) & 0xfff);
	clk_disable(ts->clk);

	__set_bit(EV_KEY, ts->input_dev->evbit);
	__set_bit(EV_ABS, ts->input_dev->evbit);
	__set_bit(BTN_TOUCH, ts->input_dev->keybit);

	input_set_abs_params(ts->input_dev, ABS_X, 0, 0xffff, 5, 0);
	input_set_abs_params(ts->input_dev, ABS_Y, 0, 0xffff, 5, 0);
	input_set_abs_params(ts->input_dev, ABS_PRESSURE, 0, 4095, 128, 0);

	error = input_register_device(ts->input_dev);
	if (error < 0) {
	dev_err(dev, "failed input device registration\n");
	goto error_reg;
	}

	return 0;

	error_reg:
	input_free_device(ts->input_dev);
	error_input:
	free_irq(ts->tsc_irq, ts);
	error_irq:
	clk_put(ts->clk);
	error_clk:
	iounmap(ts->regs);
	error_map:
	release_mem_region(ts->res->start, resource_size(ts->res));
	error_res:
	platform_set_drvdata(pdev, NULL);
	kfree(ts);

	return error;
	}

	static int __devexit tsc_remove(struct platform_device *pdev)
	{
	struct tsc_data *ts = platform_get_drvdata(pdev);

	input_unregister_device(ts->input_dev);
	free_irq(ts->tsc_irq, ts);
	clk_put(ts->clk);
	iounmap(ts->regs);
	release_mem_region(ts->res->start, resource_size(ts->res));
	platform_set_drvdata(pdev, NULL);
	kfree(ts);

	return 0;
	}

	static struct platform_driver tsc_driver = {
	.probe = tsc_probe,
	.remove = __devexit_p(tsc_remove),
	.driver.name = "tnetv107x-ts",
	.driver.owner = THIS_MODULE,
	};

	static int __init tsc_init(void)
	{
	return platform_driver_register(&tsc_driver);
	}

	static void __exit tsc_exit(void)
	{
	platform_driver_unregister(&tsc_driver);
	}

	module_init(tsc_init);
	module_exit(tsc_exit);

	MODULE_AUTHOR("Cyril Chemparathy");
	MODULE_DESCRIPTION("TNETV107X Touchscreen Driver");
	MODULE_ALIAS("platform:tnetv107x-ts");
	MODULE_LICENSE("GPL");