Linux 设备驱动之 ioctl小试牛刀（2）

    ioctl小试牛刀（1）的进阶笔记，该底层ioctl处理通过移位的方式可以控制所有的寄存器！～

 

main.c 上层应用测试代码

#include <stdio.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <unistd.h>#include <linux/ioctl.h>#include "../ioctl_c.h"GPIO_Data_S io_ctl;void main(void){int testdev;int i;char buf[10];testdev = open ("/dev/test",O_RDWR);if(testdev == -1){printf("Cann't open file...../n");exit(0);}printf("buf = 0x%x/n",buf);read(testdev,buf,10);write(testdev,buf,1);while(1){io_ctl.port=6;io_ctl.bit=5;io_ctl.value=1;io_ctl.v=0;ioctl(testdev,GPIO_IO_SET,&io_ctl);ioctl(testdev,GPIO_IO_WRITE,&io_ctl);ioctl(testdev,GPIO_IO_READ,&io_ctl);io_ctl.port=6; io_ctl.bit=6; io_ctl.value=1; io_ctl.v=1; ioctl(testdev,GPIO_IO_SET,&io_ctl); ioctl(testdev,GPIO_IO_WRITE,&io_ctl); ioctl(testdev,GPIO_IO_READ,&io_ctl);sleep(1);io_ctl.port=6;io_ctl.bit=6;io_ctl.value=1;io_ctl.v=0;ioctl(testdev,GPIO_IO_SET,&io_ctl);ioctl(testdev,GPIO_IO_WRITE,&io_ctl);ioctl(testdev,GPIO_IO_READ,&io_ctl);io_ctl.port=6; io_ctl.bit=5; io_ctl.value=1; io_ctl.v=1; ioctl(testdev,GPIO_IO_SET,&io_ctl); ioctl(testdev,GPIO_IO_WRITE,&io_ctl); ioctl(testdev,GPIO_IO_READ,&io_ctl);sleep(1);}//ioctl(testdev,GPIO_IO_WRITE,sizeof(GPIO_Data_S));//ioctl(testdev,GPIO_IO_READ,sizeof(GPIO_Data_S));printf("%s",buf);//for(i = 0;i<10;i++)//printf("[%d]/n",buf[i]);close(testdev);}/*mknod /dev/test c 253 0*/

 

 

ioctl底层驱动代码实现

#include <linux/types.h>#include <linux/fs.h>#include <linux/mm.h>#include <linux/errno.h>#include <linux/module.h>#include <linux/moduleparam.h>#include <linux/kernel.h>#include <asm/uaccess.h>#include <linux/cdev.h>#include <linux/ioctl.h>#include <linux/slab.h>#include <linux/fcntl.h>#include <asm/segment.h>#include <asm/io.h>#include <asm/arch/regs-gpio.h>#include "ioctl_c.h"unsigned int test_major=253;unsigned int test_minor=0;struct cdev cdevc;MODULE_LICENSE("Dual BSD/GPL");GPIO_Data_S ioctl;static int read_test(struct file *file,char *buf,int count ,loff_t *f_pos){printk("/n read_test");printk("%d",count);return count;}static int write_test(struct file *file,const char *buf,int count, loff_t *f_pos){printk("/n write_test");return count;}static void gpio_cfg(){size_t Data;printk("gpio_cfg start!/n");Data = __raw_readl(ioctl.port*0x10+S3C2410_GPACON);Data &= ~(3<<2*ioctl.bit);Data |= (ioctl.value<<2*ioctl.bit);__raw_writel(Data,ioctl.port*0x10+S3C2410_GPACON);}static void gpio_read(){printk("gpio_read start!!/n");size_t Data_con,Data_dat;Data_con = __raw_readl(ioctl.port*0x10+S3C2410_GPACON);Data_dat = __raw_readl(ioctl.port*0x10+S3C2410_GPADAT);printk("%ld/n%ld/n",Data_con,Data_dat);}static void gpio_write(){printk("gpio-write start!!/n");size_t Data;Data = __raw_readl(ioctl.port*0x10+S3C2410_GPADAT);Data &= ~(1<<ioctl.bit);Data |=(ioctl.v<<ioctl.bit); __raw_writel(Data,ioctl.port*0x10+S3C2410_GPADAT);}static int ioctl_test(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg){if(copy_from_user(&ioctl,arg,sizeof(GPIO_Data_S))){return - EFAULT;}printk("/n ioctl_test");switch(cmd){case GPIO_IO_SET:gpio_cfg();break;//case GPIO_IO_GET:;break;case GPIO_IO_WRITE:gpio_write();break;case GPIO_IO_READ:gpio_read();break;default:break;}return cmd;}static int open_test(struct inode *inode,struct file *file){printk("/n open_test");return 0;}static void release_test(struct inode *inode,struct file *file){printk("/n release_test");}struct file_operations test_fops = {.owner=THIS_MODULE,.read=read_test,.write=write_test,.open=open_test,.ioctl=ioctl_test,.release=release_test,};int simple_c_init_module(void){int result;dev_t dev = 0;dev=MKDEV(test_major,test_minor);result = register_chrdev_region(dev,1,"test");printk("major= %d,minor=%d /n",test_major,test_minor);if(result < 0){printk(KERN_INFO "test : can't get major number/n");return result;}cdev_init(&cdevc,&test_fops);cdevc.owner= THIS_MODULE;cdevc.ops=&test_fops;result=cdev_add(&cdevc,dev,1);if(result)printk("Error %d adding test",result);return 0;}void simple_c_cleanup_module(void){dev_t dev=0;dev = MKDEV(test_major,test_minor);cdev_del(&cdevc);unregister_chrdev_region(dev,1);}module_init(simple_c_init_module);module_exit(simple_c_cleanup_module);