Touch Screen 移植

luohuan123

内核： 2.6.14
chip: s3c2440
LCD: NEC3.5

1.加入触摸屏S3c2440的驱动
加入目录：
（1）drivers\input\touchscreen\s3c2410_ts.c
#include
#include
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#include
#include
#include
#include
/* For ts.dev.id.version */
#define S3C2410TSVERSION 0x0101
#define WAIT4INT(x)  (((x)
#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_DEBUG
MODULE_AUTHOR("Arnaud Patard ");
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_ADCDAT0_UPDOWN));
  if (updown) {
   if (ts.count != 0) {
   long tmp;
   tmp = ts.xp;
   ts.xp = ts.yp;
   ts.yp = tmp;
    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));
/* 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
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();
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] = 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, 0x3E8, 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 | SA_SHIRQ,
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);

（2）include/asm/arch-s3c2410/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 */

2.修改Makefile文件, 目的编译s3c2410_ts.c文件
目录：drivers\input\touchscreen\Makefile
加入：
obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o

3.修改Kconfig文件， 建立选项编入内核
目录：drivers\input\touchscreen\Kconfig
加入：
config TOUCHSCREEN_S3C2410
tristate "S3C2410 Touchscreens"
depends on ARCH_SMDK2410 && INPUT && INPUT_TOUCHSCREEN  
help
   Say Y here If you have S3C2410 TouchScreen

/*是否可以不要？？*/
config TOUCHSCREEN_DEBUG
bool "Samgsung S3C2410 touchscreen debug messages"
depends on TOUCHSCREEN_S3C2410
help
   select it if you want debug message

4.添加驱动的配置参数
目录：arch\arm\mach_s3c2410\mach_smdk2410.c
加入：
/*touch panel */
#include

static struct s3c2410_ts_mach_info smdk2410_ts_cfg __initdata={
.delay = 20000,
.presc = 55,
.oversampling_shift = 2,
};
/*end touch panel*/

在static struct platform_device *smdk2410_devices[] __initdata 中添加 &s3c_device_ts,
在static void __init smdk2410_init(void)中添加
set_s3c2410ts_info(&smdk2410_ts_cfg) ;
//注smdk2410_init是在lcd移植的时候自行添加上去的

5.添加s3c_device_ts的声明
目录：arch\arm\mach_s3c2410\devs.h
加入
extern struct platform_device s3c_device_ts;

6.添加设备结构体的定义和set_s3c2410ts_info的定义
目录：arch\arm\mach_s3c2410\devs.h
加入代码：
/*touch screen*/
#include
/*#include */
struct platform_device s3c_device_ts = {
.name = "s3c2410-ts" ,
.id = -1 ,
};
EXPORT_SYMBOL(s3c_device_ts);

static struct s3c2410_ts_mach_info s3c2410ts_info ;
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) );
s3c_device_ts.dev.platform_data=&s3c2410ts_info ;
};
EXPORT_SYMBOL(set_s3c2410ts_info);
/*end here touch screen*/

7.驱动需要是使用AD转换 设置AD转换相关文件
目录：include\asm-arm\arch-s3c2410\regs-adc.h
修改
#define S3C2410_ADCTSC_XY_PST(x) (((x)&0x3)

8.make menuconfig 配置内核
Device drivers –>
Input device support –>
   Touchscreen interface      
(240) Horizontal screen resolution
(360) Vertical screen resolution
   Event interface            
   Event debugging
Touchscreens –>
Samsung S3C2410 touchscreen input driver

Samsung s3c2410 touchscreen debug message

9.make zImage
下载到内核 看到结果:
ts: Compaq touchscreen protocol output
s3c2410 TouchScreen successfully loaded

在/dev/input/ 目录下有设备文件
event0 ts0 tsraw0


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