62 lines
1.1 KiB
C
Executable File
62 lines
1.1 KiB
C
Executable File
#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/cdev.h>
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#define VSER_MAJOR 256
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#define VSER_MINOR 0
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#define VSER_DEV_CNT 1
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#define VSER_DEV_NAME "vser"
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static struct cdev vsdev;
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static struct file_operations vser_ops = {
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.owner = THIS_MODULE,
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};
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static int __init vser_init(void)
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{
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int ret;
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dev_t dev;
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dev = MKDEV(VSER_MAJOR, VSER_MINOR);
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ret = register_chrdev_region(dev, VSER_DEV_CNT, VSER_DEV_NAME);
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if (ret)
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goto reg_err;
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cdev_init(&vsdev, &vser_ops);
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vsdev.owner = THIS_MODULE;
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ret = cdev_add(&vsdev, dev, VSER_DEV_CNT);
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if (ret)
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goto add_err;
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return 0;
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add_err:
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unregister_chrdev_region(dev, VSER_DEV_CNT);
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reg_err:
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return ret;
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}
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static void __exit vser_exit(void)
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{
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dev_t dev;
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dev = MKDEV(VSER_MAJOR, VSER_MINOR);
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cdev_del(&vsdev);
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unregister_chrdev_region(dev, VSER_DEV_CNT);
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}
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module_init(vser_init);
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module_exit(vser_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Kevin Jiang <jiangxg@farsight.com.cn>");
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MODULE_DESCRIPTION("A simple character device driver");
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MODULE_ALIAS("virtual-serial");
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