驱动开发day4作业
head.h
#ifndef __HEAD_H__
#define __HEAD_H__
typedef struct
{
unsigned int MODER;
unsigned int OTYPER;
unsigned int OSPEEDR;
unsigned int PUPDR;
unsigned int IDR;
unsigned int ODR;
} gpio_t;
#define PHY_RCC 0X50000A28
#define PHY_LED1_ADDR 0X50006000
#define PHY_LED2_ADDR 0X50007000
// 构建开灯关灯功能码
#define LED_ON _IO('l', 1)
#define LED_OFF _IO('l', 0)
#endiftest.c
#include
#include
#include
#include
#include
#include
#include
#include
#include "head.h"
int main(int argc, char const *argv[])
{
int a, b, fd;
while (1)
{
printf("请输入要操作的灯:1(LED1)2(LED2)3(LED3) >");
scanf("%d", &a);
switch (a)
{
case 1:
fd = open("/dev/myled0", O_RDWR);
if (fd < 0)
{
printf("打开设备文件失败\n");
return -1;
}
break;
case 2:
fd = open("/dev/myled1", O_RDWR);
if (fd < 0)
{
printf("打开设备文件失败\n");
return -1;
}
break;
case 3:
fd = open("/dev/myled2", O_RDWR);
if (fd < 0)
{
printf("打开设备文件失败\n");
return -1;
}
break;
}
printf("请输入要进行的操作:0(关灯)1(开灯) >");
scanf("%d", &b);
switch (b)
{
case 1:
ioctl(fd, LED_ON);
break;
case 0:
ioctl(fd, LED_OFF);
break;
}
close(fd);
}
return 0;
}
mycdev.c
#include
#include
#include
#include
#include
#include
#include
#include
#include "head.h"
gpio_t *vir_led1;
gpio_t *vir_led2;
gpio_t *vir_led3;
unsigned int *vir_rcc;
struct class *cls;
struct device *ddev;
struct cdev *cdev;
dev_t dev;
unsigned int major = 0;
unsigned int minor = 0;
int num = 3;
char *name = "mycdev";
// 封装操作方法
int mycdev_open(struct inode *inode, struct file *file)
{
//获取打开文件的次设备号
int min = MINOR(inode->i_rdev);
file->private_data = (void *)min;
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
return 0;
}
long mycdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
//获取到文件的次设备号
int min = (int)file->private_data;
switch (min)
{
case 0:
switch (cmd)
{
case LED_ON:
(vir_led1->ODR) |= (0x1 << 10);
break;
case LED_OFF:
(vir_led1->ODR) &= (~(0x1 << 10));
break;
}
break;
case 1:
switch (cmd)
{
case LED_ON:
(vir_led2->ODR) |= (0x1 << 10);
break;
case LED_OFF:
(vir_led2->ODR) &= (~(0x1 << 10));
break;
}
break;
case 2:
switch (cmd)
{
case LED_ON:
(vir_led3->ODR) |= (0x1 << 8);
break;
case LED_OFF:
(vir_led3->ODR) &= (~(0x1 << 8));
break;
}
break;
}
return 0;
}
int mycdev_close(struct inode *inode, struct file *file)
{
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
return 0;
}
struct file_operations fops = {
.open = mycdev_open,
.unlocked_ioctl = mycdev_ioctl,
.release = mycdev_close,
};
static int __init mydev_init(void)
{
// 申请一个对象空间
cdev = cdev_alloc();
if (cdev == NULL)
{
printk("申请对象空间失败\n");
goto out5;
}
printk("申请对象空间成功\n");
// 初始化对象
cdev_init(cdev, &fops);
// 申请块设备号
if (major == 0) // 动态申请
{
if (alloc_chrdev_region(&dev, minor, num, name))
{
printk("动态申请块设备号失败\n");
goto out4;
}
major = MAJOR(dev);
minor = MINOR(dev);
}
else // 静态申请
{
if (register_chrdev_region(MKDEV(major, minor), num, name))
{
printk("静态指定设备号失败\n");
goto out4;
}
}
printk("申请块设备号成功\n");
// 注册驱动对象
if (cdev_add(cdev, MKDEV(major, minor), num))
{
printk("注册驱动对象失败\n");
goto out3;
}
printk("注册驱动对象成功\n");
// 向上提交目录
cls = class_create(THIS_MODULE, name);
if (IS_ERR(cls))
{
printk("向上提交目录失败\n");
goto out2;
}
printk("向上提交目录成功\n");
// 向上提交设备节点信息
int i;
for (i = minor; i < (minor + num); i++)
{
ddev = device_create(cls, NULL, MKDEV(major, i), NULL, "mycdev%d", i);
if (IS_ERR(ddev))
{
printk("向上提交设备节点信息失败\n");
goto out1;
}
}
printk("向上提交设备节点信息成功\n");
// 进行寄存器地址映射
vir_led1 = ioremap(PHY_LED1_ADDR, sizeof(gpio_t));
if (vir_led1 == NULL)
{
printk("映射失败%d\n", __LINE__);
goto out1;
}
vir_led2 = ioremap(PHY_LED2_ADDR, sizeof(gpio_t));
if (vir_led2 == NULL)
{
printk("映射失败%d\n", __LINE__);
goto led1;
}
vir_led3 = vir_led1;
vir_rcc = ioremap(PHY_RCC, 4);
if (vir_rcc == NULL)
{
printk("映射失败%d\n", __LINE__);
goto led2;
}
printk("映射成功\n");
// LED1寄存器初始化
(*vir_rcc) |= (0x1 << 4); // GPIOE控制器时钟使能
(vir_led1->MODER) &= (~(0x3 << 20));
(vir_led1->MODER) |= (0x1 << 20);
(vir_led1->ODR) &= (~(0x1 << 10)); // 默认关灯
// LED2寄存器初始化
(*vir_rcc) |= (0x1 << 5); // GPIOF控制器时钟使能
(vir_led2->MODER) &= (~(0x3 << 20));
(vir_led2->MODER) |= (0x1 << 20);
(vir_led2->ODR) &= (~(0x1 << 10));
// LED3寄存器初始化
(vir_led3->MODER) &= (~(0x3 << 16));
(vir_led3->MODER) |= (0x1 << 16);
(vir_led3->ODR) &= (~(0x1 << 8));
return 0;
led1:
iounmap(vir_led1);
led2:
iounmap(vir_led2);
out1:
// 将提交的设备节点释放
for (--i; i >= minor; i--)
{
device_destroy(cls, MKDEV(major, i));
}
// 销毁目录
class_destroy(cls);
out2:
// 注销字符设备驱动对象
cdev_del(cdev);
out3:
// 释放设备号
unregister_chrdev_region(MKDEV(major, minor), num);
out4:
// 释放申请到的字符设备驱动对象空间
kfree(cdev);
out5:
return -1;
}
static void __exit mydev_exit(void)
{
// 取消内存映射
iounmap(vir_led1);
iounmap(vir_led2);
iounmap(vir_rcc);
// 销毁设备节点信息
int i;
for (i = minor; i < (minor + num); i++)
{
device_destroy(cls, MKDEV(major, i));
}
// 销毁目录
class_destroy(cls);
// 注销字符设备驱动对象
cdev_del(cdev);
// 释放设备号
unregister_chrdev_region(MKDEV(major, minor), num);
// 释放申请到的字符设备驱动对象空间
kfree(cdev);
}
module_init(mydev_init);
module_exit(mydev_exit);
MODULE_LICENSE("GPL");