tq2440 adc 驱动

/*************************************************************

基于tq2440开发板，内核2.6.30

功能

用到的模拟量输入口是ain2.

成功实现了ad 转换，能连续采集

2012年7月11日16:33:29

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#include <linux/miscdevice.h>

#include <linux/delay.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/mm.h>

#include <linux/fs.h>

#include <linux/types.h>

#include <linux/delay.h>

#include <linux/moduleparam.h>

#include <linux/slab.h>

#include <linux/errno.h>

#include <linux/ioctl.h>

#include <linux/cdev.h>

#include <linux/string.h>

#include <linux/list.h>

#include <linux/pci.h>

#include <linux/poll.h>

#include <linux/interrupt.h>

#include <linux/platform_device.h>

#include <linux/irq.h>

#include <linux/interrupt.h>

#include <mach/regs-gpio.h>

#include <mach/hardware.h>

#include <asm/irq.h>

#include <asm/uaccess.h>

#include <asm/atomic.h>

#include <asm/unistd.h>

#define DEVICE_NAME "driver_adc"

volatile unsigned long *adccon = NULL; //adc控制寄存器

volatile unsigned long *adctsc = NULL; //adc 触摸屏控制寄存器

volatile unsigned long *adcdly = NULL; //adc 起始延迟寄存器

volatile unsigned long *adcdat0 = NULL; //adc 转换数据寄存器

volatile unsigned long *adcdat1 = NULL; //adc 转换数据寄存器

volatile unsigned long *intmsk = NULL;

//*gpbdat &= ~((1<<5) );

//ain2

// ------------------- OPEN ------------------------

ssize_t drive_open (struct inode * inode ,struct file * file)

{

printk("-----------------drive open ok----------------\n");

return 0;

}

// ------------------- RELEASE/CLOSE ---------------

ssize_t drive_release (struct inode  * inode ,struct file * file)

{

printk("-----------------drive close ok----------------\n");

return 0;

}

// ------------------- READ ------------------------

ssize_t drive_read (struct file * file ,char * buf, size_t count, loff_t * f_ops)

{

int val;

printk("-----------------drive read ok----------------\n");

*adccon |= (1<<14)|(0xff<<6)|(2<<3);//设置分频倍数0xff，设置输入通道为2

//*intmsk |= (1<<31)| (1<<5)|(1<<8);

*adccon |= 0X1;//开始转换

while( *adccon & 0x1)

;

while( !(*adccon & 0x8000) )//等待转换结束

;

val=(*adcdat0&0x3ff);

//擦，这里竟然写错了，写成adccon了，纠结了半天

//*adccon =0x3fc4;这样写不行，貌似是ioremap  位数不够的缘故

*adccon &=~1; //关adc

printk("----------------drive -----val=%d \n",val);

copy_to_user( buf,&val,sizeof(val) );

printk("---------------drive-close-ok-------------\n",val);

return val;

}

// ------------------- WRITE -----------------------

ssize_t drive_write (struct file * file ,const char * buf, size_t count, loff_t * f_ops)

{

printk("-----------------drive write ok----------------\n");

return 0;

}

// ------------------- IOCTL -----------------------

ssize_t drive_ioctl (struct inode * inode ,struct file * file, unsigned int cmd, unsigned long arg)

{

printk("-----------------drive ioctl ok----------------\n");

return 0;

}

// -------------------------------------------------

static struct file_operations drive_ops ={

.owner  = THIS_MODULE,

.open   = drive_open,

.read    = drive_read,

.write   = drive_write,

.ioctl    = drive_ioctl,

.release = drive_release,

};

static struct miscdevice misc = {

.minor = MISC_DYNAMIC_MINOR,

.name = DEVICE_NAME,

.fops = &drive_ops,

};

static int __init init_drive(void)  

{

int ret;

ret = misc_register(&misc);

adccon = (volatile unsigned long *)ioremap(0x58000000, 16);

adctsc =  (volatile unsigned long *)ioremap(0x58000004, 8);

adcdly =  (volatile unsigned long *)ioremap(0x58000008, 16);

adcdat0= (volatile unsigned long *)ioremap(0x5800000c, 16);

adcdat1= (volatile unsigned long *)ioremap(0x58000010, 16);

intmsk  = (volatile unsigned long *)ioremap(0x4a000008, 32);

printk("-----------------drive button init ok----------------\n");

return 0;

}

static void __exit exit_drive(void)

{

misc_deregister(&misc);

printk("-----------------drive button exit ok----------------\n");

}

module_init(init_drive);

module_exit(exit_drive);

MODULE_LICENSE("GPL");

//--------------------------------------------测试应用程序--------------------------------------------------

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <fcntl.h>      // open() close()

#include <unistd.h>     // read() write()

#define DEVICE_NAME "/dev/driver_adc"

//------------------------------------- main ---------------------------------------------

int main(int argc, char **argv)

{

int fd,ret;

int val;

       fd = open(DEVICE_NAME, O_RDWR);

 

if (fd == -1)

{

printf("can't open device mknod %s c zhu ci \n",DEVICE_NAME);

return 0;

}

while(1)

{

read(fd,&val,sizeof(val));

printf("------------------app--------------------\n");

printf("val=%d\n",val);

sleep(3);

}

        // close 

ret = close(fd);

if (ret == -1)

{

printf("app close error!!!!!!!!!!\n");

return 0;

}

        return 0;

}// end main