lcddrv.c

基于嵌入式LINUX的6963LCD控制器驱动及应用程序源码。

/***************************************************************
* lcddrv.c
* LCD液晶硬件驱动程序
* LCD液晶型号：6963控制器
* File Name: lcddrv.c
* Description: LCD：DB0~DB7 <-->   PB0~PB7 8路输入
               LCD：WR      <-->   PB8     输出
               LCD：RD      <-->   PB9     输出
               LCD：CS      <-->   PB10    输出
               LCD：RST     <-->   PB11    输出

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

#include <linux/module.h>
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <linux/fcntl.h>
#include <asm/arch/hardware.h>

static int lcd_write(struct file *,const char *,int,loff_t *);
static int lcd_read(struct file *,const char *,int,loff_t *);
/****************************************************************************
* 名称：lcd_read(struct file *lcd_file, const char *buf,int len,loff_t *loff)
* 功能：读函数
* 入口参数：
* 出口参数：无
* 硬件功能：PB0~PB7 8路输入
****************************************************************************/
static int lcd_read(struct file *lcd_file, const char *buf,int len,loff_t *loff)
{
        //PB0~PB7  8路
        int status,nread;
        AT91PS_SYS sys = (AT91PS_SYS) AT91C_VA_BASE_SYS;
        sys->PIOB_PER |= 0x000000ff;
        sys->PIOB_ODR |= 0x000000ff;
        sys->PIOB_IFER |= 0x00000000ff;
        sys->PMC_PCER = 0x1 << AT91C_ID_PIOB;
        //status = (unsigned char)(sys->PIOC_PDSR & 0x0000ffff);
        status = (unsigned short int)(sys->PIOB_PDSR & 0x000000ff);

        printk("<1>Stat is :%ld \n",status);
        //if(nread = copy_to_user((void *)buf,(char*)&status,sizeof(int)))
        if(nread = copy_to_user((void *)buf,(char*)&status,sizeof(unsigned short int)))
        	{
                printk("EFAULT \n");
                return -EFAULT;
          }
        return nread;
}
/****************************************************************************
* 名称：lcd_write(struct file *lcd_file, const char *buf,int len,loff_t *loff)
* 功能：写函数
* 入口参数：
* 出口参数：无
* 硬件功能：   LCD：WR      <-->   PB8     输出
               LCD：RD      <-->   PB9     输出
               LCD：CS      <-->   PB10    输出
               LCD：RST     <-->   PB11    输出
			   LCD:DB0-DB7  <-->   PB0-PB7 输出
****************************************************************************/
static int lcd_write(struct file *lcd_file, const char *buf,int len,loff_t *loff)
{
       	unsigned int iopdata;
       	AT91PS_SYS sys = (AT91PS_SYS) AT91C_VA_BASE_SYS;//pb口
       	//==========================================================//
       	//设定Pb0-PB11口为输出
       	//PIO Enable Register
       	sys->PIOB_PER=(unsigned int)(1<<0)|(unsigned int)(1<<1)|(unsigned int)(1<<2)|(unsigned int)(1<<3)|(unsigned int)(1<<4)|(unsigned int)(1<<5)|(unsigned int)(1<<6)|(unsigned int)(1<<7)|(unsigned int)(1<<8)|(unsigned int)(1<<9)|(unsigned int)(1<<10)|(unsigned int)(1<<11);
       	//PIO Output Enable Register
       	sys->PIOB_OER=(unsigned int)(1<<0)|(unsigned int)(1<<1)|(unsigned int)(1<<2)|(unsigned int)(1<<3)|(unsigned int)(1<<4)|(unsigned int)(1<<5)|(unsigned int)(1<<6)|(unsigned int)(1<<7)|(unsigned int)(1<<8)|(unsigned int)(1<<9)|(unsigned int)(1<<10)|(unsigned int)(1<<11);
       	//PIO Output Write Register
       	sys->PIOB_OWER=(unsigned int)(1<<0)|(unsigned int)(1<<1)|(unsigned int)(1<<2)|(unsigned int)(1<<3)|(unsigned int)(1<<4)|(unsigned int)(1<<5)|(unsigned int)(1<<6)|(unsigned int)(1<<7)|(unsigned int)(1<<8)|(unsigned int)(1<<9)|(unsigned int)(1<<10)|(unsigned int)(1<<11);

       	//从用户空间拷贝数据到内核空间
       	if(copy_from_user((char*)&iopdata,buf,len))
        	return -EFAULT;

       	sys->PIOB_ODSR=iopdata;
		printk("iopdata = %x",iopdata);

       	return len;
}
/****************************************************************************
* 名称：file_operations
* 功能：定义文件操作
* 入口参数：
* 出口参数：
****************************************************************************/
static struct file_operations lcd_fops=
{
      write	:(void(*))lcd_write,
      read :(void(*))lcd_read,
};

//定义模块名
char lcd_name[]="lcd";

//指定主设备号
static int gmajor = 253;

//注册函数
static int __init lcddrv_init_module(void)
{
	int retv;
      	//注册模块
      	retv=register_chrdev(gmajor,lcd_name,&lcd_fops);
      	if(retv<0)
      	{
      		printk("<1>Register Fail!\n");
         	return retv;
      	}
      	printk("<1>lcd device OK!\n");
      	return 0;

}

//注销函数
static void __exit lcddrv_cleanup(void)
{
      	int retv;
      	//注销模块
      	retv=unregister_chrdev(gmajor,lcd_name);
      	if(retv<0)
      	{
        	printk("<1>UnRegister Fail!\n");
        	return;
      	}
      	printk("<1>lcdDRV:GOOD-bye!\n");

}




module_init(lcddrv_init_module);
module_exit(lcddrv_cleanup);

/*end of lcddrv.c*/