/** 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** Copyright (c) 2004 Arnaud Patard <arnaud.patard@rtp-net.org>* iPAQ H1940 touchscreen support** ChangeLog** 2004-09-05: Herbert P?tzl <herbert@13thfloor.at>*	- added clock (de-)allocation code** 2005-03-06: Arnaud Patard <arnaud.patard@rtp-net.org>*      - h1940_ -> s3c2410 (this driver is now also used on the n30*        machines :P)*      - Debug messages are now enabled with the config option*        TOUCHSCREEN_S3C2410_DEBUG*      - Changed the way the value are read*      - Input subsystem should now work*      - Use ioremap and readl/writel** 2005-03-23: Arnaud Patard <arnaud.patard@rtp-net.org>*      - Make use of some undocumented features of the touchscreen*        controller**/#include <linux/config.h>#include <linux/errno.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/slab.h>#include <linux/input.h>#include <linux/init.h>#include <linux/serio.h>#include <linux/delay.h>#include <asm/io.h>#include <asm/irq.h>#include <asm/arch/regs-adc.h>#include <asm/arch/regs-gpio.h>#include <asm/arch/s3c2410_ts.h>#include <asm/hardware/clock.h>/* For ts.dev.id.version */#define S3C2410TSVERSION	0x0101#define WAIT4INT(x) (((x)<<8) | S3C2410_ADCTSC_YM_SEN | S3C2410_ADCTSC_YP_SEN | S3C2410_ADCTSC_XP_SEN | S3C2410_ADCTSC_XY_PST(3))#define AUTOPST (S3C2410_ADCTSC_YM_SEN | S3C2410_ADCTSC_YP_SEN | S3C2410_ADCTSC_XP_SEN | S3C2410_ADCTSC_AUTO_PST | S3C2410_ADCTSC_XY_PST(0))#define DEBUG_LVL    KERN_DEBUGMODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");MODULE_DESCRIPTION("s3c2410 touchscreen driver");MODULE_LICENSE("GPL");/** Definitions & global arrays.*/static char *s3c2410ts_name = "s3c2410 TouchScreen";/** Per-touchscreen data.*/struct s3c2410ts {	struct input_dev dev;	long xp;	long yp;	int count;	int shift;	char phys[32];};static struct s3c2410ts ts;static void __iomem *base_addr;static inline void s3c2410_ts_connect(void){	s3c2410_gpio_cfgpin(S3C2410_GPG12, S3C2410_GPG12_XMON);	s3c2410_gpio_cfgpin(S3C2410_GPG13, S3C2410_GPG13_nXPON);	s3c2410_gpio_cfgpin(S3C2410_GPG14, S3C2410_GPG14_YMON);	s3c2410_gpio_cfgpin(S3C2410_GPG15, S3C2410_GPG15_nYPON);}static void touch_timer_fire(unsigned long data){	unsigned long data0;	unsigned long data1;	int updown;		data0 = readl(base_addr+S3C2410_ADCDAT0);	data1 = readl(base_addr+S3C2410_ADCDAT1);		updown = (!(data0 & S3C2410_ADCDAT0_UPDOWN)) && (!(data1 & S3C2410_ADCDAT1_UPDOWN));		if (updown) {		if (ts.count != 0) {			ts.xp >>= ts.shift;			ts.yp >>= ts.shift;			#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG			{				struct timeval tv;				do_gettimeofday(&tv);				printk(DEBUG_LVL "T: %06d, X: %03ld, Y: %03ld\n", (int)tv.tv_usec, ts.xp, ts.yp);				printk(KERN_INFO "T: %06d, X: %03ld, Y: %03ld\n", (int)tv.tv_usec, ts.xp, ts.yp);			}#endif						input_report_abs(&ts.dev, ABS_X, ts.xp);			input_report_abs(&ts.dev, ABS_Y, ts.yp);						input_report_key(&ts.dev, BTN_TOUCH, 1);			input_report_abs(&ts.dev, ABS_PRESSURE, 1);			input_sync(&ts.dev);		}				ts.xp = 0;		ts.yp = 0;		ts.count = 0;				writel(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST, base_addr+S3C2410_ADCTSC);		writel(readl(base_addr+S3C2410_ADCCON) | S3C2410_ADCCON_ENABLE_START, base_addr+S3C2410_ADCCON);	} else {		ts.count = 0;				input_report_key(&ts.dev, BTN_TOUCH, 0);		input_report_abs(&ts.dev, ABS_PRESSURE, 0);		input_sync(&ts.dev);				writel(WAIT4INT(0), base_addr+S3C2410_ADCTSC);	}}static struct timer_list touch_timer =TIMER_INITIALIZER(touch_timer_fire, 0, 0);static irqreturn_t stylus_updown(int irq, void *dev_id, struct pt_regs *regs){	unsigned long data0;	unsigned long data1;	int updown;	/********************************debug************************************/	printk(KERN_INFO "You touch the screen\n");	/*************************************************************************/	data0 = readl(base_addr+S3C2410_ADCDAT0);	data1 = readl(base_addr+S3C2410_ADCDAT1);		updown = (!(data0 & S3C2410_ADCDAT0_UPDOWN)) && (!(data1 & S3C2410_ADCDAT1_UPDOWN));		/* TODO we should never get an interrupt with updown set while	* the timer is running, but maybe we ought to verify that the	* timer isn't running anyways. */		if (updown)		touch_timer_fire(0);		return IRQ_HANDLED;}static irqreturn_t stylus_action(int irq, void *dev_id, struct pt_regs *regs){	unsigned long data0;	unsigned long data1;	data0 = readl(base_addr+S3C2410_ADCDAT0);	data1 = readl(base_addr+S3C2410_ADCDAT1);		ts.xp += data0 & S3C2410_ADCDAT0_XPDATA_MASK;	ts.yp += data1 & S3C2410_ADCDAT1_YPDATA_MASK;	ts.count++;		if (ts.count < (1<<ts.shift)) {		writel(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST, base_addr+S3C2410_ADCTSC);		writel(readl(base_addr+S3C2410_ADCCON) | S3C2410_ADCCON_ENABLE_START, base_addr+S3C2410_ADCCON);	} else {		mod_timer(&touch_timer, jiffies+1);		writel(WAIT4INT(1), base_addr+S3C2410_ADCTSC);	}		return IRQ_HANDLED;}static struct clk	*adc_clock;/** The functions for inserting/removing us as a module.*/static int __init s3c2410ts_probe(struct device *dev){	struct s3c2410_ts_mach_info *info;		info = ( struct s3c2410_ts_mach_info *)dev->platform_data;		if (!info)	{		printk(KERN_ERR "Hm... too bad : no platform data for ts\n");		return -EINVAL;	}	#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG	printk(DEBUG_LVL "Entering s3c2410ts_init\n");#endif		adc_clock = clk_get(NULL, "adc");	if (!adc_clock) {		printk(KERN_ERR "failed to get adc clock source\n");		return -ENOENT;	}	clk_use(adc_clock);	clk_enable(adc_clock);	#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG	printk(DEBUG_LVL "got and enabled clock\n");#endif		base_addr=ioremap(S3C2410_PA_ADC,0x20);	if (base_addr == NULL) {		printk(KERN_ERR "Failed to remap register block\n");		return -ENOMEM;	}			/* Configure GPIOs */	s3c2410_ts_connect();	/* Set the prscvl*/	if ((info->presc&0xff) > 0)		writel(S3C2410_ADCCON_PRSCEN | S3C2410_ADCCON_PRSCVL(info->presc&0xFF),\			     base_addr+S3C2410_ADCCON);	else		writel(0,base_addr+S3C2410_ADCCON);			/* Initialise the adcdly registers */	if ((info->delay&0xffff) > 0)		writel(info->delay & 0xffff,  base_addr+S3C2410_ADCDLY);		writel(WAIT4INT(0), base_addr+S3C2410_ADCTSC);		/* Initialise input stuff */	memset(&ts, 0, sizeof(struct s3c2410ts));	init_input_dev(&ts.dev);	ts.dev.evbit[0] = ts.dev.evbit[0] = BIT(EV_SYN) | BIT(EV_KEY) | BIT(EV_ABS);	ts.dev.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);	input_set_abs_params(&ts.dev, ABS_X, 0, 0x3FF, 0, 0);	input_set_abs_params(&ts.dev, ABS_Y, 0, 0x3FF, 0, 0);	input_set_abs_params(&ts.dev, ABS_PRESSURE, 0, 1, 0, 0);		sprintf(ts.phys, "ts0");		ts.dev.private = &ts;	ts.dev.name = s3c2410ts_name;	ts.dev.phys = ts.phys;	ts.dev.id.bustype = BUS_RS232;	ts.dev.id.vendor = 0xDEAD;	ts.dev.id.product = 0xBEEF;	ts.dev.id.version = S3C2410TSVERSION;		ts.shift = info->oversampling_shift;		/* Get irqs */	if (request_irq(IRQ_ADC, stylus_action, SA_SAMPLE_RANDOM,		"s3c2410_action", &ts.dev)) {		printk(KERN_ERR "s3c2410_ts.c: Could not allocate ts IRQ_ADC !\n");		iounmap(base_addr);		return -EIO;	}	if (request_irq(IRQ_TC, stylus_updown, SA_SAMPLE_RANDOM,		"s3c2410_action", &ts.dev)) {		printk(KERN_ERR "s3c2410_ts.c: Could not allocate ts IRQ_TC !\n");		iounmap(base_addr);		return -EIO;	}		printk(KERN_INFO "%s successfully loaded\n", s3c2410ts_name);		/* All went ok, so register to the input system */	input_register_device(&ts.dev);		return 0;}static int s3c2410ts_remove(struct device *dev){	disable_irq(IRQ_ADC);	disable_irq(IRQ_TC);	free_irq(IRQ_TC,&ts.dev);	free_irq(IRQ_ADC,&ts.dev);		if (adc_clock) {		clk_disable(adc_clock);		clk_unuse(adc_clock);		clk_put(adc_clock);		adc_clock = NULL;	}		input_unregister_device(&ts.dev);	iounmap(base_addr);		return 0;}static struct device_driver s3c2410ts_driver = {	.name           = "s3c2410-ts",	.bus            = &platform_bus_type,	.probe          = s3c2410ts_probe,	.remove         = s3c2410ts_remove,};int __init s3c2410ts_init(void){	return driver_register(&s3c2410ts_driver);}void __exit s3c2410ts_exit(void){	driver_unregister(&s3c2410ts_driver);}module_init(s3c2410ts_init);module_exit(s3c2410ts_exit);