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chrdev_1.c
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chrdev_1.c
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#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/types.h>
/*Module info */
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mahendra Sondagar <[email protected]>");
MODULE_VERSION("1:3.0");
MODULE_DESCRIPTION("chardev_1 major/minor number allocation, static methord");
/* Creatig the major number and minor number*/
dev_t dev= MKDEV(135,1);
/* Module init */
static int __init ext0_hello_module_init(void)
{
printk (KERN_INFO "Hello World this is major/minor number example\r\n");
if(register_chrdev_region(dev, 1, "Mahi")==NULL)
{
printk (KERN_INFO "Major number= %d || Minor number= %d\r\n", MAJOR(dev), MINOR(dev));
}
else
{
printk (KERN_ERR "Fail to regiter the major/mninor numbers!\r\n");
}
return 0;
}
/*Module exit*/
static void __exit ext0_hello_module_exit(void)
{
printk(KERN_INFO "Goodbye World! unregitering the major/minor number\r\n");
unregister_chrdev_region(dev, 1);
}
module_init(ext0_hello_module_init);
module_exit(ext0_hello_module_exit);