key_drivers.rar_uclinux_uclinux 驱动

/*****************************Copyright (c)************************** ** FREE ** **--------------File Info----------------------------------------- ** File Name: test.c ** Last modified Date: 2006-9-9 ** Last Version: 1.0 ** Descriptions: User Configurable File ** **------------------------------------------------------------------------------------------------------ ** Created By: ZLG CHENMINGJI ** Created date: 2006-9-9 ** Version: 1.0 ** Descriptions: First version ** **------------------------------------------------------------------------------------------------------ ** Modified by:MAMAJINCO ** Modified date:2006-9-9 ** Version:1.0 ** Descriptions:在此忠心感谢ZLG的模版 我的高质量编程意识起源于此 ** ********************************************************************************************************/ #ifndef __KERNEL__ #define __KERNEL__ #endif #ifndef MODULE #define MODULE #endif #include "key.h" /******************************************************************************************************** function announce ********************************************************************************************************/ //以下是关键函数的声明 static int key_open(struct inode *inode, struct file *filp); //打开设备时用的 linux把设备当作文件管理 设备最好在用的时候再打开 尽量不要提前 static int key_release(struct inode *inode, struct file *filp); static int key_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long param); //控制函数 这里用于控制LED亮与灭 static int __init key_init(void);//注册时用的 注意 模块注册的越早越好 static void __exit key_cleanup(void);//卸载时用的 /********************************************************************************************************* ** "全局和静态变量在这里定义" ** global variables and static variables define here ********************************************************************************************************/ //static int major = LED_MAJOR_NR; /********************************************************************************************************/ static struct file_operations key_fops = /* driver info */ { owner: THIS_MODULE, ioctl: key_ioctl, open: key_open, release: key_release, }; /********************************************************************************************************* ** Function name: led_open ** Descriptions: open device ** Input:inode: information of device ** filp: pointer of file ** Output 0: OK ** other: not OK ** Created by: Chenmingji ** Created Date: 2006-9-9 **------------------------------------------------------------------------------------------------------- ** Modified by:mamajinco ** Modified Date: 2006-9-9 **------------------------------------------------------------------------------------------------------ ********************************************************************************************************/ static int key_open(struct inode *inode, struct file *filp) { //初始化放在OPEN里 outw(inw(S3C44B0X_PCONG)&0x00ff,S3C44B0X_PCONG); //GP4-GP7设置为输入 outb(inb(S3C44B0X_PUPG)&0x0f,S3C44B0X_PUPG); //高四为口上拉 MOD_INC_USE_COUNT; return 0; /* success */ } /********************************************************************************************************* ** Function name: led_release ** Descriptions: release device ** Input:inode: information of device ** filp: pointer of file ** Output 0: OK ** other: not OK ** Created by: Chenmingji ** Created Date: 2006-9-9 **------------------------------------------------------------------------------------------------------- ** Modified by: mamajinco ** Modified Date: 2006-9-9 **------------------------------------------------------------------------------------------------------ ********************************************************************************************************/ static int key_release(struct inode *inode, struct file *filp) { MOD_DEC_USE_COUNT; return(0); } /********************************************************************************************************* ** Function name: led_ioctl ** Descriptions: IO control function ** Input:inode: information of device ** filp: pointer of file ** cmd: command ** arg: additive parameter ** Output 0: OK ** other: not OK ** Created by: Chenmingji ** Created Date: 2006-9-9 **------------------------------------------------------------------------------------------------------- ** Modified by: mamajinco ** Modified Date: 2006-9-9 **------------------------------------------------------------------------------------------------------ ********************************************************************************************************/ static int key_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg) { unsigned char temp; switch(cmd) { case 0: temp=inb(S3C44B0X_PDATG); //读出io端口的数据 put_user((temp&0xf0)>>4,(unsigned char*)arg); break; //case 1: // break; default: return -1; break; } return 0; } /********************************************************************************************************* ** Function name: led_init ** Descriptions: init driver ** Input:none ** Output 0: OK ** other: not OK ** Created by: Chenmingji ** Created Date: 2006-9-9 **------------------------------------------------------------------------------------------------------- ** Modified by: mamajinco ** Modified Date: 2006-9-9 **------------------------------------------------------------------------------------------------------ ********************************************************************************************************/ static int __init key_init(void) { int result; result = register_chrdev(232,"key",&key_fops); /*关键语句 用于注册 注意！这是传统的注册方法 在2.4以上的linux版本中 加入了devfs设备文件系统 使注册更容易 但为了与大部分资料相同 大家看的方便 这里仍然使用老方法*/ if (result < 0) { printk(KERN_ERR DEVICE_NAME ": Unable to get major %d\n", KEY_MAJOR_NR ); //printk用于向内核输出信息 return(result); } printk(KERN_INFO DEVICE_NAME ": init OK\n"); return(0); } /********************************************************************************************************* ** Function name: led_cleanup ** Descriptions: exit driver ** Input:none ** Output none ** Created by: Chenmingji ** Created Date: 2006-9-9 **------------------------------------------------------------------------------------------------------- ** Modified by: mamajinco ** Modified Date: 2006-9-9 **------------------------------------------------------------------------------------------------------ ********************************************************************************************************/ static void __exit key_cleanup(void) { unregister_chrdev(232, "key"); //与register_chrdev配对使用 printk(KERN_INFO DEVICE_NAME ": exit OK\n"); } module_init(key_init); module_exit(key_cleanup); /********************************************************************************************************* ** End Of File ********************************************************************************************************/