#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/cdev.h>
#include <linux/uaccess.h>
#include <linux/fs.h>
#include <linux/ioport.h>
#include <linux/miscdevice.h>
#include <linux/ioctl.h>
#include <linux/delay.h>
#include <linux/gpio.h>
// static const int led1_gpio = (32*0 + 8*1 + 4);
// static const int led2_gpio = (32*0 + 8*1 + 0);
static const int led1_gpio = 33;
static const int led2_gpio = 36;
static int gec3399_leds_open(struct inode *inode, struct file *file)
{
return 0;
}
static long gec3399_leds_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
printk("cmd = %u arg = %lu\n",cmd,arg);
switch(cmd)
{
case 0: switch(arg)
{
case 0: gpio_set_value(led1_gpio,0); break;
case 1: gpio_set_value(led1_gpio,1); break;
}break;
case 1: switch(arg)
{
case 0: gpio_set_value(led2_gpio,0); break;
case 1: gpio_set_value(led2_gpio,1); break;
}break;
}
return 0;
}
static int gec3399_leds_release(struct inode *inode, struct file *file)
{
return 0;
}
static const struct file_operations gec3399_leds_fops = {
.owner = THIS_MODULE,
.open = gec3399_leds_open,
.unlocked_ioctl = gec3399_leds_ioctl,
.release = gec3399_leds_release,
};
static struct miscdevice gec3399_leds_misc = {
.minor = MISC_DYNAMIC_MINOR,
.fops = &gec3399_leds_fops,
.name = "leds_drv",
};
static int __init gec3399_leds_init(void)
{
int ret;
ret = misc_register(&gec3399_leds_misc); //注册字符设备
if(ret < 0){
printk("misc register error\n");
goto err0;
}
ret = gpio_request(led1_gpio,"led1_gpio"); //申请led1_gpio引脚为GPIO模式
if(ret < 0){
printk("gpio_request led1_gpio error\n");
goto err1;
}
ret = gpio_request(led2_gpio,"led2_gpio"); //申请led2_gpio引脚为GPIO模式
if(ret < 0){
printk("gpio_request led2_gpio error\n");
goto err2;
}
ret = gpio_direction_output(led1_gpio,1); //初始划LED1为熄灭状态
if(ret < 0){
printk("gpio direction output led1_gpio error\n");
goto err3;
}
ret = gpio_direction_output(led2_gpio,1); //初始划LED2为熄灭状态
if(ret < 0){
printk("gpio direction output led2_gpio error\n");
goto err3;
}
return 0;
err3:
gpio_free(led2_gpio);
err2:
gpio_free(led1_gpio);
err1:
misc_deregister(&gec3399_leds_misc);
err0:
return ret;
}
static void __exit gec3399_leds_exit(void)
{
misc_deregister(&gec3399_leds_misc);
}
module_init(gec3399_leds_init);
module_exit(gec3399_leds_exit);
MODULE_LICENSE("GPL");
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