DS18b20_write_byte(0x44);
udelay(5);
while(DS18b20_reset());
udelay(200);
DS18b20_write_byte(0xcc);
DS18b20_write_byte(0xbe);
data[0] = DS18b20_read_byte();
data[1] = DS18b20_read_byte();
}
static ssize_t s3c2440_18b20_read(struct file *filp, char *buf, size_t len, loff_t *off)
{
DS18b20_proc();
buf[0] = data[0];
buf[1] = data[1];
return 1;
}
static struct file_operations s3c2440_18b20_fops =
{
.owner = THIS_MODULE,
.read = s3c2440_18b20_read,
};
static int __init s3c2440_18b20_init(void)
{
if (register_chrdev(DEV_MAJOR, DEV_NAME, &s3c2440_18b20_fops) < 0)
{
printk(DEV_NAME ": Register major failed.\r\n");
return -1;
}
devfs_mk_cdev(MKDEV(DEV_MAJOR, 0),S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP, DEV_NAME);
while(DS18b20_reset());
}
static void __exit s3c2440_18b20_exit(void)
{
devfs_remove(DEV_NAME);
unregister_chrdev(DEV_MAJOR, DEV_NAME);
}
module_init(s3c2440_18b20_init);
module_exit(s3c2440_18b20_exit);
/************************* s3c2440_ds18b20.c文件结束 **************************/