Linux26304在2440上的移植之触摸屏驱动.docx
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Linux26304在2440上的移植之触摸屏驱动
嵌入式Linux之我行,主要讲述和总结了本人在学习嵌入式linux中的每个步骤。
一为总结经验,二希望能给想入门嵌入式Linux的朋友提供方便。
如有错误之处,谢请指正。
∙共享资源,欢迎转载:
一、移植环境
∙主 机:
VMWare--Fedora9
∙开发板:
Mini2440--64MBNand
∙编译器:
arm-linux-gcc-4.3.2
二、移植步骤
1.准备驱动源码。
因为linux-2.6.30.4内核中没有提供合适的ADC驱动和触摸屏驱动,所以这里就直接用友善提供的驱动
s3c24xx-adc.h
#ifndef_S3C2410_ADC_H_
#define_S3C2410_ADC_H_
#defineADC_WRITE(ch,prescale) ((ch)<<16|(prescale))
#defineADC_WRITE_GETCH(data) (((data)>>16)&0x7)
#defineADC_WRITE_GETPRE(data) ((data)&0xff)
#endif/*_S3C2410_ADC_H_*/
mini2440_adc.c
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include"s3c24xx-adc.h"
#undefDEBUG
//#defineDEBUG
#ifdefDEBUG
#defineDPRINTK(x...){printk(__FUNCTION__"(%d):
",__LINE__);printk(##x);}
#else
#defineDPRINTK(x...)(void)(0)
#endif
#defineDEVICE_NAME "adc"
staticvoid__iomem*base_addr;
typedefstruct{
wait_queue_head_twait;
intchannel;
intprescale;
}ADC_DEV;
DECLARE_MUTEX(ADC_LOCK);
staticintOwnADC=0;
staticADC_DEVadcdev;
staticvolatileintev_adc=0;
staticintadc_data;
staticstructclk *adc_clock;
#defineADCCON(*(volatileunsignedlong*)(base_addr+S3C2410_ADCCON)) //ADCcontrol
#defineADCTSC(*(volatileunsignedlong*)(base_addr+S3C2410_ADCTSC)) //ADCtouchscreencontrol
#defineADCDLY(*(volatileunsignedlong*)(base_addr+S3C2410_ADCDLY)) //ADCstartorIntervalDelay
#defineADCDAT0(*(volatileunsignedlong*)(base_addr+S3C2410_ADCDAT0)) //ADCconversiondata0
#defineADCDAT1(*(volatileunsignedlong*)(base_addr+S3C2410_ADCDAT1)) //ADCconversiondata1
#defineADCUPDN(*(volatileunsignedlong*)(base_addr+0x14)) //StylusUp/Downinterruptstatus
#definePRESCALE_DIS(0<<14)
#definePRESCALE_EN(1<<14)
#definePRSCVL(x)((x)<<6)
#defineADC_INPUT(x)((x)<<3)
#defineADC_START(1<<0)
#defineADC_ENDCVT(1<<15)
#defineSTART_ADC_AIN(ch,prescale)\
do{\
ADCCON=PRESCALE_EN|PRSCVL(prescale)|ADC_INPUT((ch));\
ADCCON|=ADC_START;\
}while(0)
staticirqreturn_tadcdone_int_handler(intirq,void*dev_id)
{
if(OwnADC){
adc_data=ADCDAT0&0x3ff;
ev_adc=1;
wake_up_interruptible(&adcdev.wait);
}
returnIRQ_HANDLED;
}
staticssize_ts3c2410_adc_read(structfile*filp,char*buffer,size_tcount,loff_t*ppos)
{
charstr[20];
intvalue;
size_tlen;
if(down_trylock(&ADC_LOCK)==0){
OwnADC=1;
START_ADC_AIN(adcdev.channel,adcdev.prescale);
wait_event_interruptible(adcdev.wait,ev_adc);
ev_adc=0;
DPRINTK("AIN[%d]=0x%04x,%d\n",adcdev.channel,adc_data,ADCCON&0x80?
1:
0);
value=adc_data;
sprintf(str,"%5d",adc_data);
copy_to_user(buffer,(char*)&adc_data,sizeof(adc_data));
OwnADC=0;
up(&ADC_LOCK);
}else{
value=-1;
}
len=sprintf(str,"%d\n",value);
if(count>=len){
intr=copy_to_user(buffer,str,len);
returnr?
r:
len;
}else{
return-EINVAL;
}
}
staticints3c2410_adc_open(structinode*inode,structfile*filp)
{
init_waitqueue_head(&(adcdev.wait));
adcdev.channel=0;
adcdev.prescale=0xff;
DPRINTK("adcopened\n");
return0;
}
staticints3c2410_adc_release(structinode*inode,structfile*filp)
{
DPRINTK("adcclosed\n");
return0;
}
staticstructfile_operationsdev_fops={
owner:
THIS_MODULE,
open:
s3c2410_adc_open,
read:
s3c2410_adc_read,
release:
s3c2410_adc_release,
};
staticstructmiscdevicemisc={
.minor=MISC_DYNAMIC_MINOR,
.name=DEVICE_NAME,
.fops=&dev_fops,
};
staticint__initdev_init(void)
{
intret;
base_addr=ioremap(S3C2410_PA_ADC,0x20);
if(base_addr==NULL){
printk(KERN_ERR"Failedtoremapregisterblock\n");
return-ENOMEM;
}
adc_clock=clk_get(NULL,"adc");
if(!
adc_clock){
printk(KERN_ERR"failedtogetadcclocksource\n");
return-ENOENT;
}
clk_enable(adc_clock);
/*normalADC*/
ADCTSC=0;
ret=request_irq(IRQ_ADC,adcdone_int_handler,IRQF_SHARED,DEVICE_NAME,&adcdev);
if(ret){
iounmap(base_addr);
returnret;
}
ret=misc_register(&misc);
printk(DEVICE_NAME"\tinitialized\n");
returnret;
}
staticvoid__exitdev_exit(void)
{
free_irq(IRQ_ADC,&adcdev);
iounmap(base_addr);
if(adc_clock){
clk_disable(adc_clock);
clk_put(adc_clock);
adc_clock=NULL;
}
misc_deregister(&misc);
}
EXPORT_SYMBOL(ADC_LOCK);
module_init(dev_init);
module_exit(dev_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("FriendlyARMInc.");
s3c2410_ts.c
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
/*Forts.dev.id.version*/
#defineS3C2410TSVERSION 0x0101
#defineWAIT4INT(x)(((x)<<8)|\
S3C2410_ADCTSC_YM_SEN|S3C2410_ADCTSC_YP_SEN|S3C2410_ADCTSC_XP_SEN|\
S3C2410_ADCTSC_XY_PST(3))
#defineAUTOPST (S3C2410_ADCTSC_YM_SEN|S3C2410_ADCTSC_YP_SEN|S3C2410_ADCTSC_XP_SEN|\
S3C2410_ADCTSC_AUTO_PST|S3C2410_ADCTSC_XY_PST(0))
staticchar*s3c2410ts_name="s3c2410TouchScreen";
static structinput_dev*dev;
static longxp;
static longyp;
static intcount;
externstructsemaphoreADC_LOCK;
staticintOwnADC=0;
staticvoid__iomem*base_addr;
staticinlinevoids3c2410_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);
}
staticvoidtouch_timer_fire(unsignedlongdata)
{
unsignedlongdata0;
unsignedlongdata1;
intupdown;
data0=ioread32(base_addr+S3C2410_ADCDAT0);
data1=ioread32(base_addr+S3C2410_ADCDAT1);
updown=(!
(data0&S3C2410_ADCDAT0_UPDOWN))&&(!
(data1&S3C2410_ADCDAT0_UPDOWN));
if(updown){
if(count!
=0){
longtmp;
tmp=xp;
xp=yp;
yp=tmp;
xp>>=2;
yp>>=2;
#ifdefCONFIG_TOUCHSCREEN_MY2440_DEBUG
structtimevaltv;
do_gettimeofday(&tv);
printk(KERN_DEBUG"T:
%06d,X:
%03ld,Y:
%03ld\n",(int)tv.tv_usec,xp,yp);
#endif
input_report_abs(dev,ABS_X,xp);
input_report_abs(dev,ABS_Y,yp);
input_report_key(dev,BTN_TOUCH,1);
input_report_abs(dev,ABS_PRESSURE,1);
input_sync(dev);
}
xp=0;
yp=0;
count=0;
iowrite32(S3C2410_ADCTSC_PULL_UP_DISABLE|AUTOPST,base_addr+S3C2410_ADCTSC);
iowrite32(ioread32(base_addr+S3C2410_ADCCON)|S3C2410_ADCCON_ENABLE_START,base_addr+S3C2410_ADCCON);
}else{
count=0;
input_report_key(dev,BTN_TOUCH,0);
input_report_abs(dev,ABS_PRESSURE,0);
input_sync(dev);
iowrite32(WAIT4INT(0),base_addr+S3C2410_ADCTSC);
if(OwnADC){
OwnADC=0;
up(&ADC_LOCK);
}
}
}
staticstructtimer_listtouch_timer=
TIMER_INITIALIZER(touch_timer_fire,0,0);
staticirqreturn_tstylus_updown(intirq,void*dev_id)
{
unsignedlongdata0;
unsignedlongdata1;
intupdown;
if(down_trylock(&ADC_LOCK)==0){
OwnADC=1;
data0=ioread32(base_addr+S3C2410_ADCDAT0);
data1=ioread32(base_addr+S3C2410_ADCDAT1);
updown=(!
(data0&S3C2410_ADCDAT0_UPDOWN))&&(!
(data1&S3C2410_ADCDAT0_UPDOWN));
if(updown){
touch_timer_fire(0);
}else{
OwnADC=0;
up(&ADC_LOCK);
}
}
returnIRQ_HANDLED;
}
staticirqreturn_tstylus_action(intirq,void*dev_id)
{
unsignedlongdata0;
unsignedlongdata1;
if(OwnADC){
data0=ioread32(base_addr+S3C2410_ADCDAT0);
data1=ioread32(base_addr+S3C2410_ADCDAT1);
xp+=data0&S3C2410_ADCDAT0_XPDATA_MASK;
yp+=data1&S3C2410_ADCDAT1_YPDATA_MASK;
count++;
if(count<(1<<2)){
iowrite32(S3C2410_ADCTSC_PULL_UP_DISABLE|AUTOPST,base_addr+S3C2410_ADCTSC);
iowrite32(ioread32(base_addr+S3C2410_ADCCON)|S3C2410_ADCCON_ENABLE_START,base_addr+S3C2410_ADCCON);
}else{
mod_timer(&touch_timer,jiffies+1);
iowrite32(WAIT4INT
(1),base_addr+S3C2410_ADCTSC);
}
}
returnIRQ_HANDLED;
}
staticstructclk *ad