static int __init hello_init(void)
{
int err;
dev_t devid = 0;
DEBUG(1, "hello world.\n");
printf_param();
if (helloworld_major) {
err = register_chrdev_region(MKDEV(helloworld_major, helloworld_minor),\
helloworld_nr_device, DEVICE_REGISTER_NAME);
} else {
err = alloc_chrdev_region(&devid, 0, helloworld_nr_device, DEVICE_REGISTER_NAME);
helloworld_major = MAJOR (devid);
helloworld_minor = MINOR(devid);
}
if (err < 0) {
DEBUG (1, "ERR alloc_chrdev_region(or register_chrdev_region).\n");
goto err_alloc_chrdev_region;
}
err = char_reg_setup_cdev();
if (err < 0) {
DEBUG (1, "err_char_reg_setup_cdev.\n");
goto err_char_reg_setup_cdev;
}
return err;
err_char_reg_setup_cdev:
unregister_chrdev_region(devid, helloworld_nr_device);
err_alloc_chrdev_region:
return err;
}
static int __init hello_2_init (void)
{
int result;
dev = MKDEV (hello_major, hello_minor);
result = register_chrdev_region (dev, number_of_devices, "test");
if (result<0) {
printk (KERN_WARNING "hello: can't get major number %d\n", hello_major);
return result;
}
char_reg_setup_cdev ();
printk (KERN_INFO "char device registered\n");
return 0;
}
