一、添加文件

1 、将 s3c2410_ts.c 文件拷贝到 drivers/input/touchscreen/ 目录下，其内容为：

/*

* 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

* iPAQ H1940 touchscreen support

*

* ChangeLog

*

* 2004-09-05: Herbert P????tzl

*- added clock (de-)allocation code

*

* 2005-03-06: Arnaud Patard

*- 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

*- Make use of some undocumented features of the touchscreen

*controller

*

*/

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#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

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#include

#include

#include

#include

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/* For ts.dev.id.version */

#define S3C2410TSVERSION0x0101

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#define WAIT4INT(x)(((x)<<8) | \

S3C2410_ADCTSC_YM_SEN | S3C2410_ADCTSC_YP_SEN | S3C2410_ADCTSC_XP_SEN | \

S3C2410_ADCTSC_XY_PST(3))

<!--[if !supportEmptyParas]--> <!--[endif]-->

#define AUTOPST(S3C2410_ADCTSC_YM_SEN | S3C2410_ADCTSC_YP_SEN | S3C2410_ADCTSC_XP_SEN | \

S3C2410_ADCTSC_AUTO_PST | S3C2410_ADCTSC_XY_PST(0))

<!--[if !supportEmptyParas]--> <!--[endif]-->

//#define DEBUG_LVLKERN_DEBUG

#define DEBUG_LVLKERN_ALERT

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MODULE_AUTHOR("Arnaud Patard ");

MODULE_DESCRIPTION("s3c2410 touchscreen driver");

MODULE_LICENSE("GPL");

<!--[if !supportEmptyParas]--> <!--[endif]-->

/*

* Definitions & global arrays.

*/

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<!--[if !supportEmptyParas]--> <!--[endif]-->

static char *s3c2410ts_name = "s3c2410 TouchScreen";

<!--[if !supportEmptyParas]--> <!--[endif]-->

/*

* Per-touchscreen data.

*/

<!--[if !supportEmptyParas]--> <!--[endif]-->

struct s3c2410ts {

struct input_dev dev;

long xp;

long yp;

int count;

int shift;

char phys[32];

};

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static struct s3c2410ts ts;

static void __iomem *base_addr;

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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);

}

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static void touch_timer_fire(unsigned long data)

{

unsigned long data0;

unsigned long data1;

int updown;

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data0 = readl(base_addr+S3C2410_ADCDAT0);

data1 = readl(base_addr+S3C2410_ADCDAT1);

if (updown) {

if (ts.count != 0) {

ts.xp >>= ts.shift;

ts.yp >>= ts.shift;

<!--[if !supportEmptyParas]--> <!--[endif]-->

#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);

}

#endif

<!--[if !supportEmptyParas]--> <!--[endif]-->

input_report_abs(&ts.dev, ABS_X, ts.xp);

input_report_abs(&ts.dev, ABS_Y, ts.yp);

<!--[if !supportEmptyParas]--> <!--[endif]-->

input_report_key(&ts.dev, BTN_TOUCH, 1);

input_report_abs(&ts.dev, ABS_PRESSURE, 1);

input_sync(&ts.dev);

}

<!--[if !supportEmptyParas]--> <!--[endif]-->

ts.xp = 0;

ts.yp = 0;

ts.count = 0;

<!--[if !supportEmptyParas]--> <!--[endif]-->

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;

<!--[if !supportEmptyParas]--> <!--[endif]-->

input_report_key(&ts.dev, BTN_TOUCH, 0);

input_report_abs(&ts.dev, ABS_PRESSURE, 0);

input_sync(&ts.dev);

<!--[if !supportEmptyParas]--> <!--[endif]-->

writel(WAIT4INT(0), base_addr+S3C2410_ADCTSC);

}

}

<!--[if !supportEmptyParas]--> <!--[endif]-->

static struct timer_list touch_timer =

TIMER_INITIALIZER(touch_timer_fire, 0, 0);

<!--[if !supportEmptyParas]--> <!--[endif]-->

static irqreturn_t stylus_updown(int irq, void *dev_id, struct pt_regs *regs)

{

unsigned long data0;

unsigned long data1;

int updown;

<!--[if !supportEmptyParas]--> <!--[endif]-->

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 !supportEmptyParas]--> <!--[endif]-->

if (updown)

touch_timer_fire(0);

<!--[if !supportEmptyParas]--> <!--[endif]-->

return IRQ_HANDLED;

}

<!--[if !supportEmptyParas]--> <!--[endif]-->

<!--[if !supportEmptyParas]--> <!--[endif]-->

static irqreturn_t stylus_action(int irq, void *dev_id, struct pt_regs *regs)

{

unsigned long data0;

unsigned long data1;

<!--[if !supportEmptyParas]--> <!--[endif]-->

data0 = readl(base_addr+S3C2410_ADCDAT0);

data1 = readl(base_addr+S3C2410_ADCDAT1);

<!--[if !supportEmptyParas]--> <!--[endif]-->

ts.xp += data0 & S3C2410_ADCDAT0_XPDATA_MASK;

ts.yp += data1 & S3C2410_ADCDAT1_YPDATA_MASK;

ts.count++;

if (ts.count < (1<

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);

}

<!--[if !supportEmptyParas]--> <!--[endif]-->

return IRQ_HANDLED;

}

<!--[if !supportEmptyParas]--> <!--[endif]-->

static struct clk*adc_clock;

<!--[if !supportEmptyParas]--> <!--[endif]-->

/*

* The functions for inserting/removing us as a module.

*/

<!--[if !supportEmptyParas]--> <!--[endif]-->

static int __init s3c2410ts_probe(struct device *dev)

{

struct s3c2410_ts_mach_info *info;

<!--[if !supportEmptyParas]--> <!--[endif]-->

info = ( struct s3c2410_ts_mach_info *)dev->platform_data;

<!--[if !supportEmptyParas]--> <!--[endif]-->

if (!info)

{

printk(KERN_ERR "Hm... too bad : no platform data for ts\n");

return -EINVAL;

}

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#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG

printk(DEBUG_LVL "Entering s3c2410ts_init\n");

#endif

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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);

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#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG

printk(DEBUG_LVL "got and enabled clock\n");

#endif

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base_addr=ioremap(S3C2410_PA_ADC,0x20);

if (base_addr == NULL) {

printk(KERN_ERR "Failed to remap register block\n");

return -ENOMEM;

}

<!--[if !supportEmptyParas]--> <!--[endif]-->

<!--[if !supportEmptyParas]--> <!--[endif]-->

/* Configure GPIOs */

s3c2410_ts_connect();

<!--[if !supportEmptyParas]--> <!--[endif]-->

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);

<!--[if !supportEmptyParas]--> <!--[endif]-->

<!--[if !supportEmptyParas]--> <!--[endif]-->

/* Initialise registers */

if ((info->delay&0xffff) > 0)

writel(info->delay & 0xffff,base_addr+S3C2410_ADCDLY);

<!--[if !supportEmptyParas]--> <!--[endif]-->

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);

<!--[if !supportEmptyParas]--> <!--[endif]-->

sprintf(ts.phys, "ts0");

<!--[if !supportEmptyParas]--> <!--[endif]-->

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;

<!--[if !supportEmptyParas]--> <!--[endif]-->

ts.shift = info->oversampling_shift;

<!--[if !supportEmptyParas]--> <!--[endif]-->

/* 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_updown", &ts.dev)) {

printk(KERN_ERR "s3c2410_ts.c: Could not allocate ts IRQ_TC !\n");

iounmap(base_addr);

return -EIO;

}

<!--[if !supportEmptyParas]--> <!--[endif]-->

printk(KERN_INFO "%s successfully loaded\n", s3c2410ts_name);

<!--[if !supportEmptyParas]--> <!--[endif]-->

/* All went ok, so register to the input system */

input_register_device(&ts.dev);

<!--[if !supportEmptyParas]--> <!--[endif]-->

return 0;

}

<!--[if !supportEmptyParas]--> <!--[endif]-->

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 !supportEmptyParas]--> <!--[endif]-->

if (adc_clock) {

clk_disable(adc_clock);

clk_unuse(adc_clock);

clk_put(adc_clock);

adc_clock = NULL;

}

<!--[if !supportEmptyParas]--> <!--[endif]-->

input_unregister_device(&ts.dev);

iounmap(base_addr);

<!--[if !supportEmptyParas]--> <!--[endif]-->

return 0;

}

<!--[if !supportEmptyParas]--> <!--[endif]-->

static struct device_driver s3c2410ts_driver = {

.name= "s3c2410-ts",

.bus= &platform_bus_type,

.probe= s3c2410ts_probe,

.remove= s3c2410ts_remove,

};

<!--[if !supportEmptyParas]--> <!--[endif]-->

<!--[if !supportEmptyParas]--> <!--[endif]-->

int __init s3c2410ts_init(void)

{

return driver_register(&s3c2410ts_driver);

}

<!--[if !supportEmptyParas]--> <!--[endif]-->

void __exit s3c2410ts_exit(void)

{

driver_unregister(&s3c2410ts_driver);

}

<!--[if !supportEmptyParas]--> <!--[endif]-->

module_init(s3c2410ts_init);

module_exit(s3c2410ts_exit);

<!--[if !supportEmptyParas]--> <!--[endif]-->

/*

Local variables:

compile-command: "make ARCH=arm CROSS_COMPILE=/usr/local/arm/3.3.2/bin/arm-linux- -k -C ../../.."

c-basic-offset: 8

End:

*/

2 、将 s3c2410_ts.h 文件拷贝到 include/asm/arch-s3c2410/ 目录下，其内容为：

<!--[if !supportEmptyParas]--> <!--[endif]-->

/* linux/include/asm/arch-s3c2410/s3c2410_ts.h

*

* Copyright (c) 2005 Arnaud Patard

*

*

* 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.

*

*

*Changelog:

*24-Mar-2005RTPCreated file

*/

<!--[if !supportEmptyParas]--> <!--[endif]-->

#ifndef __ASM_ARM_S3C2410_TS_H

#define __ASM_ARM_S3C2410_TS_H

<!--[if !supportEmptyParas]--> <!--[endif]-->

struct s3c2410_ts_mach_info {

intdelay;

intpresc;

intoversampling_shift;

};

<!--[if !supportEmptyParas]--> <!--[endif]-->

void __init set_s3c2410ts_info(struct s3c2410_ts_mach_info *hard_s3c2410ts_info);

<!--[if !supportEmptyParas]--> <!--[endif]-->

#endif /* __ASM_ARM_S3C2410_TS_H */

3 、添加 include/asm-arm/arch-s3c2410/regs-adc.h 文件，其内容为：

/* linux/include/asm/arch-s3c2410/regs-adc.h

*

* Copyright (c) 2004 Shannon Holland

*

* This program is free software; yosu 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.

*

* S3C2410 ADC registers

*

*Changelog:

*27-09-2004SAHCreated file

*/

<!--[if !supportEmptyParas]--> <!--[endif]-->

#ifndef __ASM_ARCH_REGS_ADC_H

#define __ASM_ARCH_REGS_ADC_H "regs-adc.h"

<!--[if !supportEmptyParas]--> <!--[endif]-->

#define S3C2410_ADCREG(x) (x)

<!--[if !supportEmptyParas]--> <!--[endif]-->

#define S3C2410_ADCCONS3C2410_ADCREG(0x00)

#define S3C2410_ADCTSCS3C2410_ADCREG(0x04)

#define S3C2410_ADCDLYS3C2410_ADCREG(0x08)

#define S3C2410_ADCDAT0S3C2410_ADCREG(0x0C)

#define S3C2410_ADCDAT1S3C2410_ADCREG(0x10)

<!--[if !supportEmptyParas]--> <!--[endif]-->

<!--[if !supportEmptyParas]--> <!--[endif]-->

/* ADCCON Register Bits */

#define S3C2410_ADCCON_ECFLG(1<<15)

#define S3C2410_ADCCON_PRSCEN(1<<14)

#define S3C2410_ADCCON_PRSCVL(x)(((x)&0xFF)<<6)

#define S3C2410_ADCCON_PRSCVLMASK(0xFF<<6)

#define S3C2410_ADCCON_SELMUX(x)(((x)&0x7)<<3)

#define S3C2410_ADCCON_MUXMASK(0x7<<3)

#define S3C2410_ADCCON_STDBM(1<<2)

#define S3C2410_ADCCON_READ_START(1<<1)

#define S3C2410_ADCCON_ENABLE_START(1<<0)

#define S3C2410_ADCCON_STARTMASK(0x3<<0)

<!--[if !supportEmptyParas]--> <!--[endif]-->

<!--[if !supportEmptyParas]--> <!--[endif]-->

/* ADCTSC Register Bits */

#define S3C2410_ADCTSC_YM_SEN(1<<7)

#define S3C2410_ADCTSC_YP_SEN(1<<6)

#define S3C2410_ADCTSC_XM_SEN(1<<5)

#define S3C2410_ADCTSC_XP_SEN(1<<4)

#define S3C2410_ADCTSC_PULL_UP_DISABLE(1<<3)

#define S3C2410_ADCTSC_AUTO_PST(1<<2)

#define S3C2410_ADCTSC_XY_PST(x)(((x)&0x3)<<0)

<!--[if !supportEmptyParas]--> <!--[endif]-->

/* ADCDAT0 Bits */

#define S3C2410_ADCDAT0_UPDOWN(1<<15)

#define S3C2410_ADCDAT0_AUTO_PST(1<<14)

#define S3C2410_ADCDAT0_XY_PST(0x3<<12)

#define S3C2410_ADCDAT0_XPDATA_MASK(0x03FF)

<!--[if !supportEmptyParas]--> <!--[endif]-->

/* ADCDAT1 Bits */

#define S3C2410_ADCDAT1_UPDOWN(1<<15)

#define S3C2410_ADCDAT1_AUTO_PST(1<<14)

#define S3C2410_ADCDAT1_XY_PST(0x3<<12)

#define S3C2410_ADCDAT1_YPDATA_MASK(0x03FF)

<!--[if !supportEmptyParas]--> <!--[endif]-->

#endif /* __ASM_ARCH_REGS_ADC_H */

二、修改内核其他文件

1 、在 arch/arm/mach-s3c2410/devs.c 文件中添加如下几行：

#include

<!--[if !supportEmptyParas]--> <!--[endif]-->

/* Touchscreen */

static struct s3c2410_ts_mach_info s3c2410ts_info;

<!--[if !supportEmptyParas]--> <!--[endif]-->

void __init set_s3c2410ts_info(struct s3c2410_ts_mach_info *hard_s3c2410ts_info)
{

memcpy(&s3c2410ts_info,hard_s3c2410ts_info,sizeof(struct s3c2410_ts_mach_info));

}

EXPORT_SYMBOL(set_s3c2410ts_info);

<!--[if !supportEmptyParas]--> <!--[endif]-->

struct platform_device s3c_device_ts = {

.name = "s3c2410-ts",

.id = -1,

.dev = {

.platform_data = &s3c2410ts_info,

}

};

EXPORT_SYMBOL(s3c_device_ts);

2 、在 arch/arm/mach-s3c2410/devs.h 文件中添加：

extern struct platform_device s3c_device_ts;

3 、在 arch/arm/mach-s3c2410/mach-smdk2410.c 中添加：

#include

<!--[if !supportEmptyParas]--> <!--[endif]-->

<!--[if !supportEmptyParas]--> <!--[endif]-->

static struct s3c2410_ts_mach_info sbc2410_ts_cfg __initdata = {

.delay = 10000,

.presc = 49,

.oversampling_shift = 2,

};

<!--[if !supportEmptyParas]--> <!--[endif]-->

在 smdk2410_devices 结构中，添加：

&s3c_device_ts,

<!--[if !supportEmptyParas]--> <!--[endif]-->

在 smdk2410_map_io 函数中添加：

set_s3c2410ts_info(&sbc2410_ts_cfg);

4 、在 drivers/input/touchscreen/Kconfig 中添加：

config TOUCHSCREEN_S3C2410

tristate "Samsung S3C2410 touchscreen input driver"

depends on ARCH_S3C2410 && INPUT && INPUT_TOUCHSCREEN

select SERIO

help

Say Y here if you have the s3c2410 touchscreen.

<!--[if !supportEmptyParas]--> <!--[endif]-->

If unsure, say N.

<!--[if !supportEmptyParas]--> <!--[endif]-->

To compile this driver as a module, choose M here: the

module will be called s3c2410_ts.

<!--[if !supportEmptyParas]--> <!--[endif]-->

config TOUCHSCREEN_S3C2410_DEBUG

boolean "Samsung S3C2410 touchscreen debug messages"

depends on TOUCHSCREEN_S3C2410

help

Select this if you want debug messages

5 、在 drivers/input/touchscreen/Makefile 中添加：

obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o

注：这个驱动在内核注册为/dev/input/mouse0
准备用QT来测试，未加载QT之前，系统启动完后，按触摸屏，能, 够响应中断，并且能看到坐标，但是之后再去按，就没反应了。运行QT的hello程序后，按触摸屏也是没反应。下一步就是该测试了。
还是用QT去测试吧，用QT去测试要改QT的驱动接口。