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65 lines (44 loc) · 1.32 KB
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second_drv.c
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65 lines (44 loc) · 1.32 KB
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#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <asm/uaccess.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/arch/regs-gpio.h>
#include <asm/hardware.h>
#include <linux/device.h>
static struct class *seconddrv_class;
static struct class_device *seconddrv_class_dev;
static int second_drv_open(struct inode *inode, struct file *file)
{
return 0;
}
ssize_t second_drv_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
{
return 0;
}
static struct file_operations sencod_drv_fops = {
.owner = THIS_MODULE, /* 这是一个宏，推向编译模块时自动创建的__this_module变量 */
.open = second_drv_open,
.read = second_drv_read,
};
int major;
static int second_drv_init(void)
{
major = register_chrdev(0, "second_drv", &sencod_drv_fops);
seconddrv_class = class_create(THIS_MODULE, "second_drv");
seconddrv_class_dev = class_device_create(seconddrv_class, NULL, MKDEV(major, 0), NULL, "buttons"); /* /dev/buttons */
return 0;
}
static void second_drv_exit(void)
{
unregister_chrdev(major, "second_drv");
class_device_unregister(seconddrv_class_dev);
class_destroy(seconddrv_class);
return 0;
}
module_init(second_drv_init);
module_exit(second_drv_exit);
MODULE_LICENSE("GPL");