按照天嵌官方的《Linux移植之step by step》手册上的方法，做linux2.6.30.4触摸屏驱动程序的移植没有成功，经过一番摸索发现是2.6.30.4没有合适的ADC驱动，所以就着手自己做ADC和触摸屏驱动的移植。
Linux移植之step by step PDF 版下载：http://pan.baidu.com/s/1mgFUvg8
或者
------------------------------------------分割线------------------------------------------
具体下载目录在 /2014年资料/10月/13日/TQ2440触摸屏驱动程序的移植
------------------------------------------分割线------------------------------------------
下面是我解决问题的详细过程：
1.找到天嵌给的linux2.6.30.4的源码，进入drivers/char 目录，把ADC驱动程序的源码抠出来，注意还有那个ADC驱动程序要调用的头文件，我的是直接把头文件加到ADC驱动程序的源码里面，下面是加入头文件修改后的ADC驱动程序的源代码（我把他命名为my_adc.c）：
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#ifndef _S3C2410_ADC_H_
#define _S3C2410_ADC_H_
#define ADC_WRITE(ch, prescale) ((ch)<<16|(prescale))
#define ADC_WRITE_GETCH(data) (((data)>>16)&0x7)
#define ADC_WRITE_GETPRE(data) ((data)&0xff)
#endif /* _S3C2410_ADC_H_ */
#undef DEBUG
//#define DEBUG
#ifdef DEBUG
#define DPRINTK(x...) {printk("EmbedSky_adc: " x);}
#else
#define DPRINTK(x...) (void)(0)
#endif
#define DEVICE_NAME "adc"
#define ch_0 0
#define ch_1 1
#define ch_2 2
#define ch_3 3
static void __iomem *base_addr;
typedef struct
{
wait_queue_head_t wait;
int channel;
int prescale;
}ADC_DEV;
DECLARE_MUTEX(ADC_LOCK);
static int ADC_enable = 0;
static ADC_DEV adcdev;
static volatile int ev_adc = 0;
static int adc_data;
static struct clk *adc_clock;
#define ADCCON (*(volatile unsigned long *)(base_addr + S3C2410_ADCCON)) //ADC control
#define ADCTSC (*(volatile unsigned long *)(base_addr + S3C2410_ADCTSC)) //ADC touch screen control
#define ADCDLY (*(volatile unsigned long *)(base_addr + S3C2410_ADCDLY)) //ADC start or Interval Delay
#define ADCDAT0 (*(volatile unsigned long *)(base_addr + S3C2410_ADCDAT0)) //ADC conversion data 0
#define ADCDAT1 (*(volatile unsigned long *)(base_addr + S3C2410_ADCDAT1)) //ADC conversion data 1
#define ADCUPDN (*(volatile unsigned long *)(base_addr + 0x14)) //Stylus Up/Down interrupt status
#define PRESCALE_DIS (0 << 14)
#define PRESCALE_EN (1 << 14)
#define PRSCVL(x) ((x) << 6)
#define ADC_INPUT(x) ((x) << 3)
#define ADC_START (1 << 0)
#define ADC_ENDCVT (1 << 15)
#define START_ADC_AIN(ch, prescale) \
do{ ADCCON = PRESCALE_EN | PRSCVL(prescale) | ADC_INPUT((ch)) ; \
ADCCON |= ADC_START; \
}while(0)
int iSaveADCTSC=0;
static int tq2440_adc_ioctl(
struct inode *inode,
struct file *file,
unsigned int cmd,
unsigned long arg)
{
if (arg > 4)
{
return -EINVAL;
}
switch(cmd)
{
case ch_0:
adcdev.channel=0;
return 0;
case ch_1:
adcdev.channel=1;
return 0;
case ch_2:
adcdev.channel=2;
return 0;
case ch_3:
adcdev.channel=3;
return 0;
default:
return -EINVAL;
}
}
static ssize_t tq2440_adc_read(struct file *filp, char *buffer, size_t count, loff_t *ppos)
{
char str[20];
int value;
size_t len;
if (down_trylock(&ADC_LOCK) == 0)
{
ADC_enable = 1;
START_ADC_AIN(adcdev.channel, adcdev.prescale);
iSaveADCTSC=ADCTSC;
ADCTSC=ADCTSC&(~0x1<<2);
ADCCON|=0x01;
while(ADCCON&0x1);
while(!ADCCON&(0x1<<15));
adc_data = ADCDAT0 & 0x3ff;
ADCTSC=iSaveADCTSC;
ev_adc = 0;
DPRINTK("AIN[%d] = 0x%04x, %d\n",