//led.h 头文件
#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_LED1_ADDR 0X50006000
#define PHY_LED2_ADDR 0X50007000
#define PHY_LED3_ADDR 0X50006000
#define PHY_RCC_ADDR 0X50000A28
//定义功能码
#define LED_ON _IOW('l',1,int)//开灯
#define LED_OFF _IOW('l',0,int)//关灯
#define LED1_ON _IO('l',1)
#endif
//test.c 测试
#include<stdlib.h>
#include<stdio.h>
#include <syspes.h>
#include <sysat.h>
#include <fcntl.h>
#include<unistd.h>
#include<string.h>
#include <sys/ioctl.h>
#include"head.h"
int main(int argc, char const *argv[])
{
char buf[128]={0};
int fd=open("/dev/mychrdev",O_RDWR);
if(fd<0)
{
printf("打开设备文件失败\n");
exit(-1);
}
int a,b;
while(1)
{
printf("请输入要实现的功能:1(开灯) 0(关灯)>");
scanf("%d",&a);
if(a==1)//开灯
{
printf("请输入要操作的灯:1(LED1) 2(LED2) 3(LED3)>");
scanf("%d",&b);
ioctl(fd,LED_ON,&b);
}
else //关灯
{
printf("请输入要操作的灯:1(LED1) 2(LED2) 3(LED3)>");
scanf("%d",&b);
ioctl(fd,LED_OFF,&b);
}
}
close(fd);
return 0;
}
//驱动
mydev.c
#include <linux/init.h>
#include <linux/module.h>
#include<linuxatform_device.h>
#include<linux/mod_devicetable.h>
#include<linux/of.h>
#include<linux/of_gpio.h>
#include "led.h"
/*myplatform{
compatible ="hqyj,platform";
reg = <0x12345678 0x14>;
interrupt-parent = <&gpiof>;
interrupts = <9 0>;
led1=<&gpioe 10 0>;
};
*/
struct resource *res;
int irqno;
struct gpio_desc *gpiono;
int major;
char kbuf[128]={0};
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 *lof)
{
printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
unsigned long ret;
//向用户空间读取拷贝
if(size>sizeof(kbuf))//用户空间期待读取的大小内核满足不了,那就给内核支持的最大大小
size=sizeof(kbuf);
ret=copy_to_user(ubuf,kbuf,size);
if(ret)//拷贝失败
{
printk("copy_to_user filed\n");
return ret;
}
return 0;
}
ssize_t mycdev_write(struct file *file, const char *ubuf, size_t size, loff_t *lof)
{
unsigned long ret;
//从用户空间读取数据
if(size>sizeof(kbuf))//用户空间期待读取的大小内核满足不了,那就给内核支持的最大大小
size=sizeof(kbuf);
ret=copy_from_user(kbuf,ubuf,size);
if(ret)//拷贝失败
{
printk("copy_to_user filed\n");
return ret;
}
return 0;
}
//ioctl
long mycdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
int which,ret;
//将ioctl第三个参数的数值拷贝给which;
ret=copy_from_user(&which,(void *)arg,sizeof(int));
if(ret)
{
printk("copy_from_user filed\n");
return -EIO;
}
//根据功能码进行硬件功能控制
switch(cmd)
{
case LED_ON:
switch(which)
{
case 1:
vir_led1->ODR |= (1<<10);
break;
case 2:
vir_led2->ODR |= (1<<10);
break;
case 3:
vir_led3->ODR |= (1<<8);
break;
}
break;
case LED_OFF:
switch(which)
{
case 1:
vir_led1->ODR &= (~(1<<10));
break;
case 2:
vir_led2->ODR &= (~(1<<10));
break;
case 3:
vir_led3->ODR &= (~(1<<8));
break;
}
break;
}
return 0;
}
int mycdev_close(struct inode *inode, struct file *file)
{
printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
return 0;
}
//分配对象并且初始化
//probe函数
int pdrv_probe(struct platform_device *pdev)
{
printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
//获取MEM类型设备资源
res=platform_get_resource(pdev,IORESOURCE_MEM,0);
if(res==NULL)
{
printk("获取设备信息失败\n");
return -ENODATA;
}
//获取中断类型资源
irqno=platform_get_irq(pdev,0);
if(irqno<0)
{
printk("获取中断类型资源失败\n");
return -ENODATA;
}
printk("mem类型资源数值为:%x\n",res->start);
printk("中断类型的资源数值为%d\n",irqno);
gpiono=gpiod_get_from_of_node(pdev->dev.of_node,"led1",0, GPIOD_OUT_LOW,NULL);
if(IS_ERR(gpiono))
{
printk("解析gpio编号失败\n");
return PTR_ERR(gpiono);
}
gpiod_set_value(gpiono,1);
return 0;
}
//remove函数
int pdrv_remove(struct platform_device *pdev)
{
printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
//灭灯
gpiod_set_value(gpiono,0);
gpiod_put(gpiono);
return 0;
}
//构建设备树匹配标配
struct of_device_id oftable[]=
{
{.compatible="hqyj,platform"},
{.compatible="hqyj,platform1"},
{},
};
//分配对象并且初始化
struct platform_driver pdrv={
.probe=pdrv_probe,
.remove=pdrv_remove,
.driver={
.name="aaaaa",
.of_match_table=oftable,//设置设备树匹配
},
};
//定义操作方法结构体变量并赋值
struct file_operations fops={
.open=mycdev_open,
.read=mycdev_read,
.write=mycdev_write,
.unlocked_ioctl=mycdev_ioctl,
.release=mycdev_close,
};
//一键注册宏
module_platform_driver(pdrv);
MODULE_LICENSE("GPL");
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