中断
来源：互联网 发布：汉王全屏幕软件下载 编辑：程序博客网 时间：2024/05/18 16:35
驱动层
#include <linux/kernel.h>#include <linux/module.h>#include <linux/cdev.h>#include <linux/fs.h>#include <linux/miscdevice.h>#include <linux/kdev_t.h>#include <linux/device.h>#include <linux/io.h>#include <linux/uaccess.h>#include <linux/export.h>#include <linux/types.h>#include <linux/gpio.h>#include <linux/interrupt.h>#define GPM4CON 0x110002E0volatile unsigned long *baseaddr = 0;#define rGPM4CON (*((volatile unsigned long *)(baseaddr + 0)))#define rGPM4DAT (*((volatile unsigned long *)(baseaddr + 1)))#define MYKEY_MAJOR 0#define MYKEY_NAME "mykey"#define MYKEY_DRVNUM 1#define MYKEY_NUM 4dev_t mykey_devt; //设备号int mykey_major;struct class *mykey_class; //设备结构体struct cdev *mykey; //设备驱动核心结构char led_status[MYKEY_NUM]={-1,-1,-1,-1};struct mykey{ long gpio; int num; char name[10]; int irq;};struct mykey mykeys[4]={{EXYNOS4_GPX3(2),0,"KEY0"},{EXYNOS4_GPX3(3),1,"KEY1"},{EXYNOS4_GPX3(4),2,"KEY2"},{EXYNOS4_GPX3(5),3,"KEY3"},};char key_status[4]={1,1,1,1};loff_t key_lseek (struct file *fp, loff_t off, int whence){ loff_t newoff=0; switch(whence) { case SEEK_SET: newoff=off; break; case SEEK_CUR: newoff = fp->f_pos+off; break; case SEEK_END: newoff = 4 + off; default: return -EINVAL; } if(newoff<0) newoff = 0; else if(newoff>4) newoff = 4; fp->f_pos=newoff; return newoff;}ssize_t key_read (struct file *fp, char __user *buf, size_t size, loff_t *off){ /* int i=0; unsigned long ret; if(*off>4) return -EINVAL; if(*off+size>4) size = 4-*off; for(i=0;i<MYKEY_NUM;i++) key_status[i]= !(rGPM4DAT&(0x1<<i)); ret = copy_to_user(buf,&key_status[*off],size); *off = *off+size; printk("key_read is calkey\n"); return 0;*/ if(copy_to_user(buf,key_status,4)) { return -EINVAL; } //printk("mykey_read is called\n"); return 0; } ssize_t key_write (struct file *fp, const char __user *buf, size_t size, loff_t *off){ int i; unsigned long temp; if(*off>4) return -EINVAL; if(*off + size >4) size = 4 - *off; temp = copy_from_user(&key_status[*off],buf,size); for(i=0;i<MYKEY_NUM;i++) { if(key_status[i] == 0) rGPM4DAT |= (0x1<<i); else if(key_status[i] == 1) rGPM4DAT &= ~(0x1<<i); else return -EINVAL; } *off = *off + size; printk("key_write is calkey \n"); return 0;} int key_open (struct inode *node, struct file *fp){ int i=0; fp->private_data =(void *) MINOR(node->i_rdev); rGPM4CON &= ~(0xffff); rGPM4CON |= (0x1111); for(i=0;i<MYKEY_NUM;i++) { key_status[i] = !(rGPM4DAT&(0x1<<i)); } printk("key_open is calkey \n"); return 0;}int key_close (struct inode *node, struct file *fp){ printk("key_close is calkey \n"); return 0;}long key_ioctl(struct file *fp, unsigned int cmd, unsigned long arg){ int i=0; if(_IOC_TYPE(cmd) != 'x') return -EINVAL; switch (_IOC_DIR(cmd)) { case _IOC_READ: for(i=0;i<MYKEY_NUM;i++) { key_status[i] =! (rGPM4DAT&(0x1<<i)); } if(copy_to_user((long*)arg,key_status,4)) return -EINVAL; break; case _IOC_WRITE: if(_IOC_NR(cmd)==0) rGPM4DAT |= (0x1<<arg); else if(_IOC_NR(cmd) == 1) rGPM4DAT &= ~(0x1<<arg); else return -EINVAL; break; case (_IOC_WRITE|_IOC_READ): { for(i=0;i<MYKEY_NUM;i++) key_status[i]=! (rGPM4DAT&(0x1<<i)); switch (_IOC_NR(cmd)) { case 0: rGPM4DAT |= (0x1<<*((int *)arg)); break; case 1: rGPM4DAT &= ~(0x1<<*((int *)arg)); break; default : return -EINVAL; break; } if(copy_to_user((long*)arg,key_status,MYKEY_NUM)) return -EINVAL; break; } case _IOC_NONE: break; default: break; } return 0;}struct file_operations key_fops={ .owner=THIS_MODULE, .open =key_open, .release = key_close, .read=key_read, .write = key_write, .unlocked_ioctl = key_ioctl, .llseek = key_lseek,};irqreturn_t mykey_handler(int irq,void *dev){ struct mykey *tmp = (struct mykey *)dev; key_status[tmp->num] = gpio_get_value(tmp->gpio); if(key_status[tmp->num]) rGPM4DAT &= ~(0x1<<tmp->num); else rGPM4DAT |= (0x1<<tmp->num); return IRQ_HANDLED;}static int __init mykey_init(void){ int i=0;#if MYKEY_MAJOR mykey_major = MYKEY_MAJOR; mykey_devt = MKDEV(mykey_major,0); if(register_chrdev_region(mykey_devt,MYKEY_DRVNUM,MYKEY_NAME))#else if(alloc_chrdev_region(&mykey_devt,0,MYKEY_DRVNUM,MYKEY_NAME))#endif { printk("注册失败\n"); return -EBUSY; } mykey = cdev_alloc(); cdev_init(mykey,&key_fops); if(cdev_add(mykey,mykey_devt,MYKEY_DRVNUM)) { printk("注册成功\n"); return -EBUSY; } printk("注册成功\n"); mykey_class = class_create(THIS_MODULE,MYKEY_NAME); device_create(mykey_class,NULL,mykey_devt,NULL,"%s",MYKEY_NAME); baseaddr = ioremap(GPM4CON, 8); for(i=0;i<MYKEY_NUM;i++) { //获取中断号 mykeys[i].irq = gpio_to_irq(mykeys[i].gpio); ///注册中断 if(request_irq(mykeys[i].irq, mykey_handler,IRQF_TRIGGER_FALLING|IRQF_TRIGGER_RISING|IRQF_SHARED,mykeys[i].name,(void*)&mykeys[i])) goto REQUTEST_IRQ_FAILLED; } return 0;REQUTEST_IRQ_FAILLED: for(--i;i>=0;i--) { //使能中断 disable_irq(mykeys[i].irq); //注销中断 free_irq(mykeys[i].irq,(void *)&mykeys[i]); } return -EINVAL;}static void __exit mykey_exit(void){ int i; iounmap(baseaddr); for(i=0;i<MYKEY_NUM;i++) { disable_irq(mykeys[i].irq); free_irq(mykeys[i].irq,(void *)&mykeys[i]); } device_destroy(mykey_class, mykey_devt); class_destroy(mykey_class); cdev_del(mykey); unregister_chrdev_region(mykey_devt,MYKEY_DRVNUM); printk("注销成功\n");}module_init(mykey_init);module_exit(mykey_exit);MODULE_LICENSE("GPL");应用层
#include<stdio.h>#include<stdlib.h>#include<unistd.h>#include<sys/types.h>#include<sys/stat.h>#include<fcntl.h>char key_oldstatus[4]={-1,-1,-1,-1};char key_newstatus[4]={-1,-1,-1,-1};void print(int fd){ int i=0; read(fd,key_newstatus,4); for(i=0;i<4;i++) { if(key_oldstatus[i] !=key_newstatus[i]) { printf("key%d:%s\n",i,key_newstatus[i]?"up":"down"); key_oldstatus[i] = key_newstatus[i]; } }}int main(int argc,char *argv[]){ int fd = open(argv[1],O_RDWR); if(fd == -1) { printf("打开失败\n"); return 0; } read(fd,key_oldstatus,4); while(1) print(fd); close(fd); return 0;}阅读全文
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