驱动开发day3 7.25
ioctl控制LED、蜂鸣器、风扇、马达 (为每一个硬件注册一个驱动)
头文件
#ifndef __HEAD_H__
#define __HEAD_H__
typedef struct{
volatile unsigned int MODER;
volatile unsigned int OTYPER;
volatile unsigned int OSPEEDR;
volatile unsigned int PUPDR;
volatile unsigned int IDR;
volatile unsigned int ODR;
}gpio_t;
#define PHY_LED1_ADDR 0x50006000
#define PHY_LED2_ADDR 0x50007000
#define PHY_LED3_ADDR 0x50006000
#define PHY_RCC_ADDR 0x50000a28
//功能码
#define LED_ON _IO('l',1)
#define LED_OFF _IO('l',0)
#endif功能函数
#include
#include
#include
#include
#include
#include
#include
#include
#include "head.h"
int main(int argc, char const *argv[])
{
int a;
char buf[128] = {0};
printf("invoking open\n");
int fd = open("/dev/myled0", O_RDWR);
if (fd < 0)
{
printf("open file failed");
exit(-1);
}
while (1)
{
printf("请输入控制指令：0（关灯） 1（开灯）>");
scanf("%d",&a);
switch (a)
{
case 1:
ioctl(fd,LED_ON);
break;
case 0:
ioctl(fd,LED_OFF);
default:
break;
}
}
printf("invoking close\n");
close(fd);
return 0;
} LED驱动函数
#include
#include
#include
#include
#include
#include "head.h"
// 定义一个变量保存主设备号
unsigned int major;
char kbuf[128] = {0};
unsigned int *vir_moder;
gpio_t *vir_led1;
gpio_t *vir_led2;
gpio_t *vir_led3;
unsigned int *vir_rcc;
struct class *cls;
struct device *dev;
int mycdev_open(struct inode *inode, struct file *file)
{
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
return 0;
}
ssize_t mycdev_read(struct file *file, char *ubuf, size_t size, loff_t *loff)
{
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
unsigned long ret;
if (size > sizeof(kbuf))
{
size = sizeof(kbuf);
}
ret = copy_to_user(ubuf, kbuf, size);
if (ret)
{
printk("copy_to_user failed\n");
return ret;
}
return 0;
}
ssize_t mycdev_write(struct file *file, const char *ubuf, size_t size, loff_t *loff)
{
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
if (size > sizeof(kbuf))
{
size = sizeof(kbuf);
}
long ret;
ret = copy_from_user(kbuf, ubuf, size);
if (ret)
{
printk("copy_from_user failed\n");
return -EIO;
}
return 0;
}
int mycdev_close(struct inode *inode, struct file *file)
{
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
return 0;
}
long mycdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
switch (cmd)
{
case LED_ON:
switch (arg)
{
case 1:
vir_led1->ODR |= (0x1 << 10);
break;
case 2:
vir_led2->ODR |= (0x1 << 10);
break;
case 3:
vir_led3->ODR |= (0x1 << 8);
break;
default:
break;
}
break;
case LED_OFF:
switch (arg)
{
case 1:
vir_led1->ODR &= (~(0x1 << 10));
break;
case 2:
vir_led2->ODR &= (~(0x1 << 10));
break;
case 3:
vir_led1->ODR &= (~(0x1 << 8));
break;
default:
break;
}
break;
default:
break;
}
return 0;
}
struct file_operations fops = {
.open = mycdev_open,
.read = mycdev_read,
.write = mycdev_write,
.release = mycdev_close,
.unlocked_ioctl = mycdev_ioctl,
};
int all_led_init(void)
{
// 寄存器地址的映射
vir_led1 = ioremap(PHY_LED1_ADDR, sizeof(gpio_t));
if (vir_led1 == NULL)
{
printk("ioremap failed:%d\n", __LINE__);
return -ENOMEM;
}
vir_led2 = ioremap(PHY_LED2_ADDR, sizeof(gpio_t));
if (vir_led2 == NULL)
{
printk("ioremap failed:%d\n", __LINE__);
return -ENOMEM;
}
vir_led3 = ioremap(PHY_LED3_ADDR, sizeof(gpio_t));
if (vir_led3 == NULL)
{
printk("ioremap failed:%d\n", __LINE__);
return -ENOMEM;
}
vir_rcc = ioremap(PHY_RCC_ADDR, 4);
if (vir_rcc == NULL)
{
printk("ioremap failed:%d\n", __LINE__);
return -ENOMEM;
}
printk("物理地址映射成功\n");
// 寄存器初始化
// rcc
(*vir_rcc) |= (0x3 << 4);
// led1
vir_led1->MODER &= (~(0x3 << 20));
vir_led1->MODER |= (0x1 << 20);
// led2
vir_led2->MODER &= (~(0x3 << 20));
vir_led2->MODER |= (0x1 << 20);
// led3
vir_led3->MODER &= (~(0x3 << 16));
vir_led3->MODER |= (0x1 << 16);
printk("寄存器初始化成功\n");
return 0;
}
static int __init mycdev_init(void)
{
int i;
// 注册字符设备驱动
major = register_chrdev(0, "mychrdev", &fops);
if (major < 0)
{
printk("register error\n");
return major;
}
printk("register success\n");
cls = class_create(THIS_MODULE, "myled");
if (IS_ERR(cls))
{
printk("向上提交目录失败\n");
return -PTR_ERR(cls);
}
printk("向上提交目录信息成功]\n");
for (i = 0; i < 3; i++)
{
dev = device_create(cls, NULL, MKDEV(major, i), NULL, "myled%d", i);
if (IS_ERR(dev))
{
printk("向上提交结点设备信息失败\n");
return -PTR_ERR(dev);
}
}
printk("向上提交设备节点成功\n");
// 寄存器映射以及初始化
all_led_init();
return 0;
}
static void __exit mycdev_exit(void)
{
// 取消地址映射
iounmap(vir_led1);
iounmap(vir_led2);
iounmap(vir_led3);
// 销毁节点信息
int i;
for (i = 0; i < 3; i++)
{
device_destroy(cls, MKDEV(major, i));
}
// 销毁目录信息
class_destroy(cls);
// 注销字符设备驱动
unregister_chrdev(major, "mycdev");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL"); 蜂鸣器驱动函数
#include
#include
#include
#include
#include
#include "head.h"
// 定义一个变量保存主设备号
unsigned int major;
char kbuf[128] = {0};
gpio_t *vir_buzzer;
unsigned int *vir_rcc;
struct class *cls;
struct device *dev;
int mycdev_open(struct inode *inode, struct file *file)
{
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
return 0;
}
ssize_t mycdev_read(struct file *file, char *ubuf, size_t size, loff_t *loff)
{
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
unsigned long ret;
if (size > sizeof(kbuf))
{
size = sizeof(kbuf);
}
ret = copy_to_user(ubuf, kbuf, size);
if (ret)
{
printk("copy_to_user failed\n");
return ret;
}
return 0;
}
ssize_t mycdev_write(struct file *file, const char *ubuf, size_t size, loff_t *loff)
{
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
if (size > sizeof(kbuf))
{
size = sizeof(kbuf);
}
long ret;
ret = copy_from_user(kbuf, ubuf, size);
if (ret)
{
printk("copy_from_user failed\n");
return -EIO;
}
return 0;
}
int mycdev_close(struct inode *inode, struct file *file)
{
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
return 0;
}
long mycdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
switch (cmd)
{
case BUZZ_ON:
vir_buzzer->ODR |= (0x1 << 6);
break;
case BUZZ_OFF:
vir_buzzer->ODR &= (~(0x1 << 6));
break;
default:
break;
}
return 0;
}
struct file_operations fops = {
.open = mycdev_open,
.read = mycdev_read,
.write = mycdev_write,
.release = mycdev_close,
.unlocked_ioctl = mycdev_ioctl,
};
int all_buzzer_init(void)
{
// 寄存器地址的映射
vir_buzzer = ioremap(PHY_BUZZ_ADDR, 4);
if (vir_buzzer == NULL)
{
printk("ioremap failed:%d\n", __LINE__);
return -ENOMEM;
}
vir_rcc = ioremap(PHY_RCC_ADDR, 4);
if (vir_rcc == NULL)
{
printk("ioremap failed:%d\n", __LINE__);
return -ENOMEM;
}
printk("物理地址映射成功\n");
// 寄存器初始化
// rcc
(*vir_rcc) |= (0x1 << 1);
// fan
vir_buzzer->MODER &= (~(0x3 << 12));
vir_buzzer->MODER |= (0x1 << 12);
// vir_fan->AFRH &= (~(0xf << 4));
//vir_fan->AFRH |= (0x1 << 4);
printk("寄存器初始化成功\n");
return 0;
}
static int __init mycdev_init(void)
{
// 注册字符设备驱动
major = register_chrdev(0, "mychrdev", &fops);
if (major < 0)
{
printk("register error\n");
return major;
}
printk("register success\n");
cls = class_create(THIS_MODULE, "mybuzzer");
if (IS_ERR(cls))
{
printk("向上提交目录失败\n");
return -PTR_ERR(cls);
}
printk("向上提交目录信息成功]\n");
dev = device_create(cls, NULL, MKDEV(major, 0), NULL, "mybuzzer");
if (IS_ERR(dev))
{
printk("向上提交结点设备信息失败\n");
return -PTR_ERR(dev);
}
printk("向上提交设备节点成功\n");
// 寄存器映射以及初始化
all_buzzer_init();
return 0;
}
static void __exit mycdev_exit(void)
{
// 取消地址映射
iounmap(vir_buzzer);
// 销毁节点信息
device_destroy(cls, MKDEV(major, 0));
// 销毁目录信息
class_destroy(cls);
// 注销字符设备驱动
unregister_chrdev(major, "mycdev");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL"); 风扇驱动程序
#include
#include
#include
#include
#include
#include "head.h"
// 定义一个变量保存主设备号
unsigned int major;
char kbuf[128] = {0};
gpio_t *vir_fan;
unsigned int *vir_rcc;
struct class *cls;
struct device *dev;
int mycdev_open(struct inode *inode, struct file *file)
{
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
return 0;
}
ssize_t mycdev_read(struct file *file, char *ubuf, size_t size, loff_t *loff)
{
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
unsigned long ret;
if (size > sizeof(kbuf))
{
size = sizeof(kbuf);
}
ret = copy_to_user(ubuf, kbuf, size);
if (ret)
{
printk("copy_to_user failed\n");
return ret;
}
return 0;
}
ssize_t mycdev_write(struct file *file, const char *ubuf, size_t size, loff_t *loff)
{
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
if (size > sizeof(kbuf))
{
size = sizeof(kbuf);
}
long ret;
ret = copy_from_user(kbuf, ubuf, size);
if (ret)
{
printk("copy_from_user failed\n");
return -EIO;
}
return 0;
}
int mycdev_close(struct inode *inode, struct file *file)
{
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
return 0;
}
long mycdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
switch (cmd)
{
case fan_ON:
vir_fan->ODR |= (0x1 << 9);
break;
case fan_OFF:
vir_fan->ODR &= (~(0x1 << 9));
break;
default:
break;
}
return 0;
}
struct file_operations fops = {
.open = mycdev_open,
.read = mycdev_read,
.write = mycdev_write,
.release = mycdev_close,
.unlocked_ioctl = mycdev_ioctl,
};
int all_fan_init(void)
{
// 寄存器地址的映射
vir_fan = ioremap(PHY_FAN_ADDR, 4);
if (vir_fan == NULL)
{
printk("ioremap failed:%d\n", __LINE__);
return -ENOMEM;
}
vir_rcc = ioremap(PHY_RCC_ADDR, 4);
if (vir_rcc == NULL)
{
printk("ioremap failed:%d\n", __LINE__);
return -ENOMEM;
}
printk("物理地址映射成功\n");
// 寄存器初始化
// rcc
(*vir_rcc) |= (0x1 << 4);
// fan
vir_fan->MODER &= (~(0x3 << 18));
vir_fan->MODER |= (0x1 << 18);
// vir_fan->AFRH &= (~(0xf << 4));
//vir_fan->AFRH |= (0x1 << 4);
printk("寄存器初始化成功\n");
return 0;
}
static int __init mycdev_init(void)
{
// 注册字符设备驱动
major = register_chrdev(0, "mychrdev", &fops);
if (major < 0)
{
printk("register error\n");
return major;
}
printk("register success\n");
cls = class_create(THIS_MODULE, "myfan");
if (IS_ERR(cls))
{
printk("向上提交目录失败\n");
return -PTR_ERR(cls);
}
printk("向上提交目录信息成功]\n");
dev = device_create(cls, NULL, MKDEV(major, 0), NULL, "myfan");
if (IS_ERR(dev))
{
printk("向上提交结点设备信息失败\n");
return -PTR_ERR(dev);
}
printk("向上提交设备节点成功\n");
// 寄存器映射以及初始化
all_fan_init();
return 0;
}
static void __exit mycdev_exit(void)
{
// 取消地址映射
iounmap(vir_fan);
// 销毁节点信息
device_destroy(cls, MKDEV(major, 0));
// 销毁目录信息
class_destroy(cls);
// 注销字符设备驱动
unregister_chrdev(major, "mycdev");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL"); 马达驱动函数
#include
#include
#include
#include
#include
#include "head.h"
// 定义一个变量保存主设备号
unsigned int major;
char kbuf[128] = {0};
gpio_t *vir_motor;
unsigned int *vir_rcc;
struct class *cls;
struct device *dev;
int mycdev_open(struct inode *inode, struct file *file)
{
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
return 0;
}
ssize_t mycdev_read(struct file *file, char *ubuf, size_t size, loff_t *loff)
{
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
unsigned long ret;
if (size > sizeof(kbuf))
{
size = sizeof(kbuf);
}
ret = copy_to_user(ubuf, kbuf, size);
if (ret)
{
printk("copy_to_user failed\n");
return ret;
}
return 0;
}
ssize_t mycdev_write(struct file *file, const char *ubuf, size_t size, loff_t *loff)
{
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
if (size > sizeof(kbuf))
{
size = sizeof(kbuf);
}
long ret;
ret = copy_from_user(kbuf, ubuf, size);
if (ret)
{
printk("copy_from_user failed\n");
return -EIO;
}
return 0;
}
int mycdev_close(struct inode *inode, struct file *file)
{
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
return 0;
}
long mycdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
switch (cmd)
{
case MOTOR_ON:
vir_motor->ODR |= (0x1 << 6);
break;
case MOTOR_OFF:
vir_motor->ODR &= (~(0x1 << 6));
break;
default:
break;
}
return 0;
}
struct file_operations fops = {
.open = mycdev_open,
.read = mycdev_read,
.write = mycdev_write,
.release = mycdev_close,
.unlocked_ioctl = mycdev_ioctl,
};
int all_motor_init(void)
{
// 寄存器地址的映射
vir_motor = ioremap(PHY_MOTOR_ADDR, 4);
if (vir_motor == NULL)
{
printk("ioremap failed:%d\n", __LINE__);
return -ENOMEM;
}
vir_rcc = ioremap(PHY_RCC_ADDR, 4);
if (vir_rcc == NULL)
{
printk("ioremap failed:%d\n", __LINE__);
return -ENOMEM;
}
printk("物理地址映射成功\n");
// 寄存器初始化
// rcc
(*vir_rcc) |= (0x1 << 5);
// fan
vir_motor->MODER &= (~(0x3 << 12));
vir_motor->MODER |= (0x1 << 12);
// vir_fan->AFRH &= (~(0xf << 4));
//vir_fan->AFRH |= (0x1 << 4);
printk("寄存器初始化成功\n");
return 0;
}
static int __init mycdev_init(void)
{
// 注册字符设备驱动
major = register_chrdev(0, "mychrdev", &fops);
if (major < 0)
{
printk("register error\n");
return major;
}
printk("register success\n");
cls = class_create(THIS_MODULE, "mymotor");
if (IS_ERR(cls))
{
printk("向上提交目录失败\n");
return -PTR_ERR(cls);
}
printk("向上提交目录信息成功]\n");
dev = device_create(cls, NULL, MKDEV(major, 0), NULL, "mymotor");
if (IS_ERR(dev))
{
printk("向上提交结点设备信息失败\n");
return -PTR_ERR(dev);
}
printk("向上提交设备节点成功\n");
// 寄存器映射以及初始化
all_motor_init();
return 0;
}
static void __exit mycdev_exit(void)
{
// 取消地址映射
iounmap(vir_motor);
// 销毁节点信息
device_destroy(cls, MKDEV(major, 0));
// 销毁目录信息
class_destroy(cls);
// 注销字符设备驱动
unregister_chrdev(major, "mycdev");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");