SET_RESP_LEN
u8 set_brightness[SET_CMD_LEN], resp[SET_RESP_LEN];
return dell_uart_bl_command(dell_bl, set_brightness, SET_CMD_LEN, resp, SET_RESP_LEN);
u8 set_power[SET_CMD_LEN], resp[SET_RESP_LEN];
ret = dell_uart_bl_command(dell_bl, set_power, SET_CMD_LEN, resp, SET_RESP_LEN);