Make a sysfs file

static ssize_t show_temp(struct device *dev,
                         struct device_attribute *attr,
                         char *buf)
{
        struct usb_interface *intf = to_usb_interface(dev);
        struct gotemp *gdev = usb_get_intfdata(intf);

        return sprintf(buf, "%d\n", gdev->temp);
}
static DEVICE_ATTR(temp, S_IRUGO, show_temp, NULL);

In gotemp_probe:
        device_create_file(&interface->dev, &dev_attr_temp);

In gotemp_disconnect:
        device_remove_file(&interface->dev, &dev_attr_temp);