diolan_usb_cmd
return diolan_usb_cmd(dev, CMD_I2C_START, false);
return diolan_usb_cmd(dev, CMD_I2C_REPEATED_START, false);
return diolan_usb_cmd(dev, CMD_I2C_STOP, true);
ret = diolan_usb_cmd(dev, CMD_GET_FW_VERSION, true);
ret = diolan_usb_cmd(dev, CMD_GET_SERIAL, true);