how can i develop a programme which control lcd?

#include <linux/module.h># include <linux/errno.h># include <linux/cdev.h># include <linux/config.h># include <linux/types.h># include <linux/errno.h># include <linux/miscdevice.h># include <linux/slab.h># include <linux/ioport.h># include <linux/fcntl.h># include <linux/mc146818rtc.h># include <linux/netdevice.h># include <linux/sched.h># include <linux/delay.h>

# include <asm/io.h># include <asm/uaccess.h># include <asm/system.h># include <linux/delay.h>

# define LCD_On 1# define LCD_Off 2# define LCD_Clear 3# define LCD_Reset 4# define LCD_Cursor_Left 5# define LCD_Cursor_Right 6# define LCD_Disp_Left 7# define LCD_Disp_Right 8# define LCD_Get_Cursor 9# define LCD_Set_Cursor 10# define LCD_Home 11# define LCD_Read 12# define LCD_Write 13# define LCD_Cursor_Off 14# define LCD_Cursor_On 15# define LCD_Get_Cursor_Pos 16# define LCD_Set_Cursor_Pos 17# define LCD_Blink_Off 18

# define kLCD_IR na_led_green# define kLCD_DR (na_led_green + 8)

# define LCDWriteData(x) outl(x , kLCD_DR)# define LCDWriteInst(x) outl(x , kLCD_IR)

# define LCDReadData inl(kLCD_DR)# define LCDReadInst inl(kLCD_IR)

# define Major 250

static int Device_Open = 0;

static int lcd_16207_ioctl(struct inode *inode,struct file *filp,

unsigned int cmd,unsigned long arg);

static int lcd_16207_open(struct inode *inode,struct file *filp)

{

static int counter = 0;

if(Device_Open)return -EBUSY;

Device_Open++;

printk("You have open the device %d times\n",counter++);

return 0;

}

static int lcd_16207_release(struct inode *inode,struct file *filp)

{

Device_Open--;

printk("You have release the device\n");

return 0;

}

static int lcd_16207_ioctl(struct inode *inode,struct file *filp,

unsigned int cmd,unsigned long arg)

{

volatile unsigned long display;

switch (cmd) {

case LCD_On:

if (copy_from_user

(&display, (unsigned long *) arg,

sizeof(display)))

return -EFAULT;

LCDWriteInst(display);

break;

case LCD_Off:

if (copy_from_user

(&display, (unsigned long *) arg,

sizeof(display)))

return -EFAULT;

LCDWriteData(display);

break;

default:

return -EINVAL;

}

return 0;

}

static struct file_operations lcd_16207_fops={

.ioctl = lcd_16207_ioctl,

.open = lcd_16207_open,

.release = lcd_16207_release,

};

static int lcd_16207_init(void)

{

int ret = register_chrdev(Major,"LCD_PIO",&lcd_16207_fops);

if(ret<0)

{

printk("Registering the device failed with %d\n",Major);

return Major;

}

printk("You have init Device %d\n",Major);

return 0;

}

static void lcd_16207_exit(void)

{

if(unregister_chrdev(Major,"LCD_PIO"))

printk("exit failed");

}

module_init(lcd_16207_init);

module_exit(lcd_16207_exit);

MODULE_AUTHOR("Andrew Bose");

MODULE_LICENSE("GPL");