71 lines
1.3 KiB
C
71 lines
1.3 KiB
C
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/cdev.h>
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#include <linux/fs.h>
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#include <linux/wait.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/device.h>
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#include "pub.h"
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("liuchao");
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extern struct bus_type my_bus;
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void my_dev_release(struct device *dev)
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{
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printk("%s-%s\n", __FILE__, __func__);
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}
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static struct device my_dev = {
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.init_name = "my_dev",
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.bus = &my_bus,
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.release = my_dev_release,
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};
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unsigned long id = 0;
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ssize_t my_dev_id_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%d\n", id);
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}
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ssize_t my_dev_id_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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kstrtoul(buf, 10, &id);
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return count;
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}
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DEVICE_ATTR(my_dev_id, S_IRUSR|S_IWUSR, my_dev_id_show, my_dev_id_store);
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static __init int my_dev_init(void)
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{
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printk("my_dev init\n");
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device_register(&my_dev);
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device_create_file(&my_dev, &dev_attr_my_dev_id);
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return 0;
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}
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module_init(my_dev_init);
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static __exit void my_dev_exit(void)
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{
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printk("xdev exit\n");
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device_remove_file(&my_dev, &dev_attr_my_dev_id);
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device_unregister(&my_dev);
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}
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module_exit(my_dev_exit);
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