led_driver_test.rar_sysTypes.h_test led driver

#include <linux/fs.h> #include <linux/config.h>//配置头文件 #include <linux/kernel.h>//内核头文件 #include <linux/sched.h> #include <linux/timer.h>//时钟头文件 #include <linux/init.h>//用户定义模块初始函数名需引用的头文件 #include <linux/module.h>//模块加载的头文件 //#include <asm-arm/arch-omap/hardware.h> #include <asm-arm/leds.h> #include <linux/delay.h> #include "systypes.h" #include <asm-arm/arch-pxa/pxa-regs.h>//定义物理地址 #include <asm-arm/arch-pxa/hardware.h> void DM_WaitMs(int msVal) { OMCR4 = (1<<7)|0; OSMR4 = msVal; OSCR4 = 0; OIER = 1<<4; OSSR = 1<<4; OMCR4 |= 2; while(!(OSSR&(1<<4))); } /*file_operations结构*/ int gpio_open(struct inode*,struct file*); int gpio_release(struct inode*,struct file*); int gpio_ctl_ioctl(struct inode*,struct file*,unsigned int,unsigned long); struct file_operations gpio_ctl_fops = { owner:THIS_MODULE, ioctl:gpio_ctl_ioctl, open:gpio_open, release:gpio_release, }; /*入口函数*/ #define IOPORT_MAJOR 220 //major int _init_module(void) { int ret = 0; int test_major = 0; printk("gpio_init\n"); ret = register_chrdev(IOPORT_MAJOR,"GPIO",&gpio_ctl_fops); if(ret < 0) { printk("fail to register\n"); return -1; } if(test_major == 0) test_major = ret; printk("success to register\n"); return 0; } /*led控制函数*/ void LedOn(int led) { switch(led){ case 0: GPCR3 = 1 << 10; break; case 1: GPCR3 = 1 << 11; break; case 2: GPCR3 = 1 << 12; break; case 3: GPCR3 = 1 << 0; break; default: break; } } void LedOff(int led) { switch(led){ case 0: //GPIO106输出1,D4灭 GPSR3 = 1 << 10; break; case 1: //GPIO107输出1,D5灭 GPSR3 = 1 << 11; break; case 2: //GPIO108输出1,D6灭 GPSR3 = 1 << 12; break; case 3: //GPIO96输出1,D7灭 GPSR3 = 1 << 0; break; default: break; } } /*gpio_open函数*/ int gpio_open(struct inode *inode,struct file *file) { //禁止内核的LED事件改变LED灯状态 leds_event(led_halted); GAFR3_L &= ~((3 << 20)|(3 << 22)|(3 << 24)|(3 << 0)); //the corresponding pin (GPIO106\107\108\96)are used as general purpose I/O GPDR3 |= (1 << 10)|(1 << 11)|(1 << 12)|(1 << 0); //the pins of GPIO106\107\108\96 are used as output pins GPSR3 = (1 << 10)|(1 << 11)|(1 << 12)|(1 << 0); //置GPIO106\107\108\96为"1" printk("open gpio devices\n"); return 0; } /*gpio_release函数*/ int gpio_release(struct inode *inode,struct file *file) { leds_event(led_halted + 2); printk("release this device\n"); return 0; } /*gpio_ctl_ioctl函数*/ int gpio_ctl_ioctl(struct inode *inode,struct file *file,unsigned int command,unsigned long arg ) { int err = 0; int i = 0; if (command == 1) { while(arg--) { i = 0 ; //循环一次点亮各个LED灯 while(1) { LedOn(i); DM_WaitMs(200); LedOff(i); DM_WaitMs(200); i++; if(i >= 4) { break; } printk("..."); } } printk("\n"); return 0; } else if (command ==2) { return 0; } return err; }