lcd_driver.rar_ARM毕业设计_Lcd_Driver_site:en.pudn.com

#include <linux/module.h> #include <linux/fs.h> #include <asm/io.h> #include <linux/init.h> #include <linux/kernel.h> #include <asm/uaccess.h> #include <linux/errno.h> #include <linux/types.h> MODULE_LICENSE("GPL"); unsigned int lcd_major = 0; static int open_lcd(struct inode *, struct file *); static ssize_t read_lcd(struct file *, char *, size_t , loff_t *); static int ioctl_lcd(struct inode *, struct file *, unsigned int cmd, unsigned long); static ssize_t write_lcd(struct file *, const char *, size_t, loff_t *); static int close_lcd(struct inode *, struct file *); static void delay(); static int open_lcd(struct inode *inode, struct file *file) { return 0; } static ssize_t read_lcd(struct file *file, char *buf, size_t len, loff_t *off) { return 0; } static ssize_t write_lcd(struct file *file, const char *buf, size_t len, loff_t *off) { unsigned char *lcd_data_addr; unsigned char data; lcd_data_addr = ioremap((unsigned long)0x30000000, (unsigned long)1); data = *buf; writeb(data, lcd_data_addr); iounmap((void *)lcd_data_addr); return *off; } static int ioctl_lcd(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { unsigned char *lcd_row_addr; unsigned char *lcd_list_addr; unsigned char *lcd_control_addr; unsigned char *lcd_data_addr; unsigned char ctrl; unsigned char row; unsigned char list; unsigned char data; int i, j; lcd_control_addr = ioremap((unsigned long)0x3000000c, (unsigned long)1); lcd_row_addr = ioremap((unsigned long)0x30000004, (unsigned long)1); lcd_list_addr = ioremap((unsigned long)0x30000008, (unsigned long)1); lcd_data_addr = ioremap((unsigned long)0x30000000, (unsigned long)1); switch(cmd) { case 1: //printk("before ctrl=0x%x\n", ctrl); copy_from_user(&ctrl, (unsigned char *)arg, sizeof(unsigned char)); //printk("ofter ctrl=0x%x\n", ctrl); writeb(ctrl, lcd_control_addr); delay(); break; case 2: copy_from_user(&row, (unsigned char *)arg, sizeof(unsigned char)); writeb(row, lcd_row_addr); delay(); break; case 3: copy_from_user(&list, (unsigned char *)arg, sizeof(unsigned char)); writeb(list, lcd_list_addr); delay(); break; case 4: copy_from_user(&data, (unsigned char *)arg, sizeof(unsigned char)); //printk("kernel data=0x%x\n", data); for(i = 0; i < 234; i++) { writeb(row, lcd_row_addr); delay(); writeb(list, lcd_list_addr); delay(); writeb(list, lcd_list_addr); delay(); for(j = 0; j < 320; j++) { writeb(data, lcd_data_addr); delay(); } row = row + 0x01; } } iounmap((void *)lcd_control_addr); iounmap((void *)lcd_row_addr); iounmap((void *)lcd_list_addr); iounmap((void *)lcd_data_addr); return - ENOTTY; } static int close_lcd(struct inode *inode, struct file *file) { return 0; } struct file_operations lcd_fops = { open:open_lcd, read:read_lcd, write:write_lcd, ioctl:ioctl_lcd, release:close_lcd, }; int init_module(void) { int ret; ret = register_chrdev(lcd_major, "lcd", &lcd_fops); if(ret < 0) { printk("lcd register error\n !!!"); return ret; } else { if(lcd_major == 0) { lcd_major = ret; printk("lcd register success,lcd major is %d !!!\n", ret); } else { printk("lcd register success,lcd major is %d !!!\n", lcd_major); } } return 0; } void cleanup_module(void) { int ret; ret = unregister_chrdev(lcd_major, "lcd"); if (ret < 0) { printk("test_var unregister failure !!!\n"); } else { printk("test_var unregister success!!!\n"); } } void delay() { int i,j; for(i=0;i<=1;i++) for(j=0;j<=100;j++) { ; } }