lcddrv1.c

lcddrv1.c 为驱动源程序 lcddrv1_user.c为应用程序代码 功能： 在ioctl中区分所写的数据是命令

#ifdef MODULE
#include <linux/module.h>
#include <linux/version.h>
#else
#define MOD_INC_USE_COUNT
#define MOD_DEC_USE_COUNT
#endif

//#define __KERNEL__
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/ioport.h>
#include <linux/fcntl.h>
#include <asm/uaccess.h>
#include <asm/io.h>

#define IOPMOD    (*(volatile unsigned *)0x3ff5000)
#define IOPDATA   (*(volatile unsigned *)0x3ff5008)
#define EXTACON0  (*(volatile unsigned *)0x3ff3008)
#define EXTACON1  (*(volatile unsigned *)0x3ff300c)
#define EXTDBWTH  (*(volatile unsigned *)0x3ff3010)

#define LCD_COM  (*(volatile unsigned int *)0x3600000)//lcd命令寄存器处于arm io0区
#define LCD_DATA  (*(volatile unsigned int  *)0x3600000) //lcd数据寄存器 
//#define HPI_addr  (*(volatile unsigned *)0x3604000) //hpi地址处于arm io1区

void Delay(unsigned int x);
void delay_10us(void);
void delay_40us(void);
void delay_100us(void);
void delay_10ms(void);
void delay_40ms(void);

void initial_lcd(void);                             //初始化液晶
void write_lcd_com(unsigned int lcd_command);       //写命令
void write_lcd_data_byte(unsigned int lcd_data);    //写数据字节
void write_lcd_data_word(unsigned int lcd_data);    //写数据字
void lcd_test(void);

#define LCD_WRITE_COM 0x4800
static int lcd_open(struct inode *,struct file *);
static int lcd_release(struct inode *,struct file *);
static int lcd_write(struct file *,char *,int,loff_t *);
static int lcd_ioctl(struct inode *lcd_node,struct file *lcd_file,unsigned int cmd,unsigned int arg);


static int major=240;
char lcd_name[]="lcddrv";

unsigned int lcd_com_flag=0;

static struct file_operations lcd_fops=
{
    open: (void(*))lcd_open,
    write:(void(*))lcd_write,
    ioctl:(void(*))lcd_ioctl,
    release:(void(*))lcd_release,
};

static int  __init lcd_init_module(void)
{
  int retv;
  retv=register_chrdev(major,lcd_name,&lcd_fops);
  if(retv<0)
    {
      printk("<1>register fail!\n");
      return retv;
    }
  if(major==0)
     major=retv;
  printk("<1>lcddrv register ok!\n");
  return 0;

}

static void __exit lcd_cleanup_module(void)
{
   int retv;
   retv=unregister_chrdev(major,lcd_name);
   if(retv<0)
    {
      printk("<1>ungersiter fail!\n");
      return;
    }
   printk("<1>lcddrv bye!\n");

}

module_init(lcd_init_module);
module_exit(lcd_cleanup_module);


static int  lcd_open(struct inode *lcd_node,struct file *lcd_file)

{  
   IOPMOD=0xffffffff;
   EXTDBWTH=0x0ff03002;//io区全为32位宽度,dram0区32位宽度,rom0区1位宽度//0x05503002;//0x0503003
   EXTACON0= 0xfffffff;//时序最长
   EXTACON1= 0xfffffff;//时序最长

   initial_lcd();//初始化液晶
   printk("lcd initialed ok!\n");
   return 0;
}

static int lcd_release(struct inode *lcd_node ,struct file *lcd_file)
{
 printk("file closed\n");
  return 0;
}

static int lcd_write(struct file *lcd_file,char *buf,int len ,loff_t *loff)
{

   unsigned int lcddata_fromuser;
   unsigned int temp; 
 if(copy_from_user((char *)&lcddata_fromuser,buf,len))
      return -EFAULT;
  // temp=lcddata_fromuser;
  if(lcd_com_flag==1)   //写命令
      {
        write_lcd_com(lcddata_fromuser);
        printk("lcdcom=%x\n",lcddata_fromuser);   
        lcd_com_flag=0;
      }
  else
    {   
        write_lcd_com(lcddata_fromuser>>16);
        write_lcd_data_word(lcddata_fromuser&0x0000ffff);
        printk("lcddata=%x\n",lcddata_fromuser);
     }

  // write_lcd_com(0x0087);
   // write_lcd_data_word(0xbdda);
     //   write_lcd_com(0x85);//(0x00850000);
       // write_lcd_data_word(0xdfc8);//(0xdfc80000);//呷
     /*  write_lcd_com(0x0080);//(0x00800000);      //写命令 光标地址
       write_lcd_data_word(0xdfc8);//(0xdfc80000);//呷
       printk("<1>write com ok!\n");
        write_lcd_data_word(0xb6f0);//(0xb5a30000); //写显示的字的编码  担
       write_lcd_com(0x0081);//(0x00810000);
       write_lcd_data_word(0xb6f0);//(0xb6f00000);//告
        write_lcd_com(0x0082);//(0x00820000);
       write_lcd_data_word(0xb7d0);//(0xb7d00000);//娶
                                                                              
        write_lcd_com(0x0083);//(0x00830000);
       write_lcd_data_word(0xc9b3);//(0xc9b30000);//沙
                                                                              
        write_lcd_com(0x0084);//(0x00840000);
       write_lcd_data_word(0xbdda);//(0xbdda2000);//节
                                                                              
        write_lcd_com(0x85);//(0x00850000);
       write_lcd_data_word(0xdfc8);//(0xdfc80000);//呷
                                                                              
          */

  return len;

}

static int lcd_ioctl(struct inode *lcd_node,struct file *lcd_file,unsigned int cmd,unsigned int arg)
{
  int retv;
  switch(cmd)
      {
         case LCD_WRITE_COM:
                      lcd_com_flag=1;
                      break;
         default:
              break;
  
      }
   return 0;

}


////液晶相关函数
void initial_lcd()    //初始化液晶
  {
    delay_40ms();
   write_lcd_com(0x0030);//(0x00300000);
   delay_100us();// Delay(1);
    write_lcd_com(0x0030);//(0x00300000);
    delay_40us();//Delay(1);
    write_lcd_com(0x000e);//(0x000e0000);//开显示、光标开，不闪烁
    delay_100us();//Delay(1);
   write_lcd_com(0x0001);//(0x00010000); //清屏
    delay_10ms();// Delay(1);
    write_lcd_com(0x0006);//(0x00060000);
     delay_40us();   // Delay(1);
                                                                              
                                                                              
  }
                                                                              
void write_lcd_com(unsigned int lcd_command)//写命令
    {
      IOPDATA=IOPDATA&0xfffef0ff;//0x00000000;//  命令寄存器 rs为0，rw为0写，oe=0lvc4245有效
      LCD_COM=lcd_command<<16;//lcd_command;
     delay_10us();//delay_40us();//Delay(1);
      IOPDATA=(IOPDATA&0xfffef0ff)|0x00000c00;//  rw为1读，lvc4245无效
                                                                              
    }
void write_lcd_data_byte(unsigned int lcd_data) //写字节
   {
     IOPDATA=(IOPDATA&0xfffef0ff)|0x00010000;//数据寄存器 ，rs为1，rw为0写，lvc4245有效
     LCD_DATA=lcd_data<<16;//lcd_data;
     delay_10us(); //delay_40us(); //Delay(1);
    IOPDATA=(IOPDATA&0xfffef0ff)|0x00000c00;//0x00000c00;// rw为1读，lvc4245无效
   
}
void write_lcd_data_word(unsigned int lcd_data)//写字
  {
      
      IOPDATA=(IOPDATA&0xfffef0ff)|0x00010000;// 数据寄存器，rs为1，rw为0写，lvc4245有效
     LCD_DATA=lcd_data<<8;//lcd_data>>8;
     delay_10us();//delay_40us(); // Delay(1);
      LCD_DATA=lcd_data<<16;//lcd_data&0x00ff0000;
     delay_10us();//delay_40us(); //Delay(1);
     IOPDATA=IOPDATA=(IOPDATA&0xfffef0ff)|0x00000c00;//0x00000c00;//      rw为1读，lvc4245无效
                                                                              
      return;                                                                        
  }
void Delay(unsigned int x)
{
        unsigned int i,j,k;
        for(i=0;i<=x;i++)
                for(j=0;j<0xff;j++)
                        for(k=0;k<0xff;k++);
}
void delay_10us()
 {
  int i;
  for(i=0;i<300/*500*/;i++); //40us=2000 circles
                                                                              
  }
void delay_40us()
 {
  int i;
  for(i=0;i<600/*2000*/;i++); //40us=2000 circles
                                                                              
  }
void delay_100us()
 {
  int i;
  for(i=0;i<1800/*5400*/;i++); //100us=5000 circles
                                                                              
  }
void delay_10ms()
 {
  int i;
  for(i=0;i<166800/*500500*/;i++); //10ms=500000 circles
                                                                              
  }
 void delay_40ms()
 {
  int i;
  for(i=0;i<6666800/*20000500*/;i++); //40ms=20000000 circles
                                                                              
  }