#include

#include

#include

#include/*创建设备节点*/

#include

#include/*延时函数*/

#include

#include

#includeadc.h>

#include

#defineADC_MAJOR102

#defineADC_NAME"my_adc"

#defineSUCCESS0

staticintadc_open(structinode*,structfile*);

staticintadc_release(structinode*,structfile*);

staticint__initadc_init(void);

staticint__exitadc_exit(void);

staticssize_tadc_read(structfile*,char*,size_t,loff_t*);

volatileunsignedlongadc_con;

unsignedlongadc_dat0;

//#defineadc_con(unsignedlong)ioremap(0x58000000,4)

//#defineadc_dat0(volatileunsignedlong)ioremap(0x5800000c,4)

structclk*adc_clk;

structfile_operationsadc_ops=

{

.owner=THIS_MODULE,

.read=adc_read,

.open=adc_open,

.release=adc_release,

};

staticint__initadc_init(void)

{

intret;

adc_clk=clk_get(NULL,"adc");//获取时钟

clk_enable(adc_clk);//使能时钟

ret=register_chrdev(ADC_MAJOR,ADC_NAME,&adc_ops);//注册设备

if(ret<0)

{

printk("registerdevicefail/n");

returnret;

}

adc_con=(unsignedlong)ioremap(0x58000000,4);

adc_dat0=(volatileunsignedlong)ioremap(0x58000000+S3C2410_ADCDAT0,4);

if(adc_con&adc_dat0==0)

{

printk("Failedtoioremap/n");

gotohandle;

}

printk("Initialized.../n");

returnSUCCESS;

handle:

unregister_chrdev(ADC_MAJOR,ADC_NAME);

return-1;

}

staticintadc_open(structinode*inode,structfile*file)//打开设备函数

{

returnSUCCESS;

}

staticintadc_release(structinode*inode,structfile*file)//关闭设备函数

{

returnSUCCESS;

}

staticssize_tadc_read(structfile*file,

char*buffer,

size_tlength,

loff_t*offset)//设备读取函数

{

unsignedintbuf;

inttmp;

inti;

writew((1<<14)|(0x31<<6),adc_con);//设置ADCCON

writew((readw(adc_con)|0x1),adc_con);//启动AD转换

while(readw(adc_con)&0x1);//启动转换后，等待启动位清零

while(!(readw(adc_con)&0x8000));//等待转换是否完毕

//for(i=0;i<200000;i++);

mdelay(100);

buf=(readw(adc_dat0)&0x3ff);//取出转换后得到的有效数据

copy_to_user(buffer,(char*)&buf,sizeof(buf));

//printk("Thevalueis%x/n",buf);

return2;

}

staticint__exitadc_exit(void)//驱动卸载函数

{

iounmap(adc_con);

iounmap(adc_dat0);

unregister_chrdev(ADC_MAJOR,ADC_NAME);

clk_disable(adc_clk);

clk_put(adc_clk);

printk("Theadcisunintialized/n");

returnSUCCESS;

}

module_init(adc_init);

module_exit(adc_exit);

MODULE_LICENSE("GPL");