RESP_DATA
if (resp[RESP_DATA] > DELL_BL_MAX_BRIGHTNESS) {
dev_err(dev, "Unexpected get brightness response: %d\n", resp[RESP_DATA]);
return resp[RESP_DATA];
dev_dbg(dev, "Firmware version: %.*s\n", resp[RESP_LEN] - 3, resp + RESP_DATA);