Dear Johan, The QDSS port only be used for capturing modem's log. The user application acquires the modem's log by accessing the BULK_IN EP. And no other operation requirements on this interface. Best Regards. -----邮件原件----- 发件人: Johan Hovold <johan@xxxxxxxxxx> 发送时间: 2022年8月3日 16:20 收件人: 谭 永林 <yonglin.tan@xxxxxxxxxxx> 抄送: gregkh@xxxxxxxxxxxxxxxxxxx; linux-usb@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx 主题: Re: 回复: [PATCH] USB: serial: option: add Quectel EM060K modem On Sat, Jul 30, 2022 at 07:32:47AM +0000, 谭 永林 wrote: > The last interface is used for Qualcomm WWAN module's QDSS(Qualcomm > Debug Sub-System) port. Users use the QDSS interface to acquire Modem > subsystem log. It is used to work with DIAG port. Therefore, we don't > have to bind this interface with any driver. Thanks for the details (I can add QDSS to the summary of the interface layout in the commit message when applying). But are you saying that it's not needed because that data is available also over the DIAG port? Or is there some libusb driver that should be used to access the QDSS port? Johan
