TELEM_DEV_NAME
#define TELEM_CLASS_NAME TELEM_DEV_NAME
#define DRV_NAME TELEM_DEV_NAME
#define TELEM_DEV_NAME_FMT (TELEM_DEV_NAME "%d")
ret = alloc_chrdev_region(&dev_num, 0, TELEM_MAX_DEV, TELEM_DEV_NAME);