s3c2410触摸屏驱动

最近时间比较紧，因为板子的LCD驱动出了些问题，未能做完全测试，但保证按下触摸屏时会有调试信息输出，问题应该不大

下面是驱动代码s3c2410_ts.c文件的内容


#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/ts.h> // 自己添加

#include <asm/hardware/clock.h>

#include <asm/arch/regs-clock.h>

MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");

MODULE_DESCRIPTION("s3c2410 touchscreen driver");

MODULE_LICENSE("GPL");

/* 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_INFO

#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG

#define DBG(x...) printk(KERN_INFO x)

#else

#define DBG(x...) do { } while (0)

#endif

/*

* 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_ADCDAT0_UPDOWN));

DBG(" data0 = %x, data1 = %x updown = %d %s : %s : line = %d/n", data0, data1, updown,

__FUNCTION__, __FILE__, __LINE__);

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);

}

#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;

data0 = readl(base_addr+S3C2410_ADCDAT0);

data1 = readl(base_addr+S3C2410_ADCDAT1);

updown = (!(data0 & S3C2410_ADCDAT0_UPDOWN)) && (!(data1 & S3C2410_ADCDAT0_UPDOWN));

DBG("/n data0 = %x, data1 = %x updown = %d %s : %s : line = %d/n", data0, data1, updown,

__FUNCTION__, __FILE__, __LINE__);

/* 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

{

DBG(" data0 = %x, data1 = %x, %s : %s : line = %d/n", data0, data1, __FUNCTION__, __FILE__, __LINE__);

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;

}

s3c2410_ts_connect();

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 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] = 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_updown", &ts.dev))

{

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

disable_irq(IRQ_ADC);

free_irq(IRQ_ADC, &ts.dev);

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);

然后是头文件ts.h

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

*

* Copyright (c) 2005 Arnaud Patard <arnaud.patard@rtp-net.org>

*

*

* 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-2005 RTP Created file

* 03-Aug-2005 RTP Renamed to ts.h

*/

#ifndef __ASM_ARM_TS_H

#define __ASM_ARM_TS_H

struct s3c2410_ts_mach_info {

int delay;

int presc;

int oversampling_shift;

};

void __init set_s3c2410ts_info(struct s3c2410_ts_mach_info *hard_s3c2410ts_info);

#endif /* __ASM_ARM_TS_H */



其他修改无非是在内核中添加配置选项，在平台初始化时加载驱动等，待会儿转贴一篇以作备忘