lcd.h

用于Linux 2.4内核的LCD及键盘驱动

#ifndef LCD_H
#define LCD_H

#define SUCCESS      0		/*function successfully return */
#define DEVICE_NAME "my_lcd"	/*define lcd device name */
#define LCD_MAJOR   188		/*define the lcd device major number */

/*
*Mpc860 memory control register set
*/
#define BR7_SET 0x80000401
#define OR7_SET 0xffff0ff4


/*
*Set led control 
*/
#define LED_ADDR 0x8000001b
#define LED_OFF  0xff
#define LED_ON  0x80


/*
*Lcd control command
*/
#define ENABLE_OFF 0x00
#define ENABLE_ON 0x02
#define WRITE_REG 0x00
#define WRITE_DATA 0x01

#define FUNCTION_SET   0x1c
#define DISPLAY_OFF    0x10
#define DISPLAY_ON     0x70
#define DISPLAY_CLEAR  0x80
#define INPUT_MODE_SET 0x60
#define CHANGE_LINE    0x03

#define LCD_BASE  0x80000000
#define LCD_DATA_ADDR 0x8000001d
#define LCD_CTRREG_ADDR 0x80000017
#define LCD_VIRT_LENGTH 0x1ff

/*
*Define bit-swap operations
*/
#define S_B7(x) (((x) & 0x80)>>7)
#define S_B6(x) (((x) & 0x40)>>5)
#define S_B5(x) (((x) & 0x20)>>3)
#define S_B4(x) (((x) & 0x10)>>1)
#define S_B3(x) (((x) & 0x08)<<1)
#define S_B2(x) (((x) & 0x04)<<3)
#define S_B1(x) (((x) & 0x02)<<5)
#define S_B0(x) (((x) & 0x01)<<7)
#define BIT_SWAP(x) (S_B7(x) | S_B6(x)|S_B5(x) | S_B4(x)| S_B3(x)                                 | S_B2(x)| S_B1(x)| S_B0(x))


/*
*Standard device_driver function prototypes declaratioins
*/
static int device_open (struct inode *, struct file *);
static int device_release (struct inode *, struct file *);
static ssize_t device_write (struct file *, const char *, size_t, loff_t *);


/*
*Standard moudle functions prototypes declarations
*/
int init_module (void);
void cleanup_module (void);


/*
*LCD control functions prototypes declarations
*/
static int lcd_init (void);
static void lcd_ctr_init (void);
static int init_mem (void);
static void lcd_set (unsigned char);
static void showch (unsigned char);

struct file_operations lcd_ops = {
write:device_write,
open:device_open,
release:device_release,
};

#endif