linux-kernel - Re: Re: [PATCH] USB: serial: option: add support for DW5829e

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Date:   Mon, 21 Feb 2022 10:07:35 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Slark Xiao <slark_xiao@....com>
Cc:     gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: Re: [PATCH] USB: serial: option: add support for DW5829e

On Thu, Feb 10, 2022 at 11:27:45AM +0800, Slark Xiao wrote:
> At 2022-02-09 22:27:01, "Johan Hovold" <johan@...nel.org> wrote:
> >On Wed, Feb 09, 2022 at 11:15:35AM +0800, Slark Xiao wrote:

> >> DW5829e RMNET mode:
> >> T:  Bus=04 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#=  5 Spd=5000 MxCh= 0
> >> D:  Ver= 3.10 Cls=ef(misc ) Sub=02 Prot=01 MxPS= 9 #Cfgs=  1
> >> P:  Vendor=413c ProdID=81e6 Rev=03.18
> >> S:  Manufacturer=Dell Inc.
> >> S:  Product=DW5829e Snapdragon X20 LTE
> >> S:  SerialNumber=0123456789ABCDEF
> >> C:  #Ifs= 6 Cfg#= 1 Atr=a0 MxPwr=896mA
> >> I:  If#=0x0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=qmi_wwan
> >> I:  If#=0x1 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=00 Prot=00 Driver=usbhid
> >> I:  If#=0x2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> >> I:  If#=0x3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> >> I:  If#=0x4 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> >> I:  If#=0x5 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option

> >> DW5829e-eSIM RMNET mode:
> >> T:  Bus=04 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#=  7 Spd=5000 MxCh= 0
> >> D:  Ver= 3.10 Cls=ef(misc ) Sub=02 Prot=01 MxPS= 9 #Cfgs=  1
> >> P:  Vendor=413c ProdID=81e4 Rev=03.18
> >> S:  Manufacturer=Dell Inc.
> >> S:  Product=DW5829e-eSIM Snapdragon X20 LTE
> >> S:  SerialNumber=0123456789ABCDEF
> >> C:  #Ifs= 6 Cfg#= 1 Atr=a0 MxPwr=896mA
> >> I:  If#=0x0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=qmi_wwan
> >> I:  If#=0x1 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=00 Prot=00 Driver=usbhid
> >> I:  If#=0x2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> >> I:  If#=0x3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> >> I:  If#=0x4 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> >> I:  If#=0x5 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option

> >>  #define KYOCERA_VENDOR_ID			0x0c88
> >>  #define KYOCERA_PRODUCT_KPC650			0x17da
> >> @@ -1063,6 +1065,10 @@ static const struct usb_device_id option_ids[] = {
> >>  	  .driver_info = RSVD(0) | RSVD(1) | RSVD(6) },
> >>  	{ USB_DEVICE(DELL_VENDOR_ID, DELL_PRODUCT_5821E_ESIM),
> >>  	  .driver_info = RSVD(0) | RSVD(1) | RSVD(6) },
> >> +	{ USB_DEVICE_INTERFACE_CLASS(DELL_VENDOR_ID, DELL_PRODUCT_5829E, 0xff),
> >> +	  .driver_info = RSVD(6) },
> >> +	{ USB_DEVICE_INTERFACE_CLASS(DELL_VENDOR_ID, DELL_PRODUCT_5829E_ESIM, 0xff),
> >> +	  .driver_info = RSVD(6) },
> >
> >It looks like these entries will cause the driver to bind also to the
> >QMI port however.
> >

> Actually not,  currently RMNET port would load the qmi_wwan driver
> successfully even the class of QMI is also 0xff.

That's not guaranteed so RMNET mode could break depending on probe
order with the above entries.

> Do you mean I should add RSVD(0) to reduce confusion?

You need to reserve it for correctness (or restructure the entries in
some other way to achieve the same result).
 
> >>  	{ USB_DEVICE(ANYDATA_VENDOR_ID, ANYDATA_PRODUCT_ADU_E100A) },	/* ADU-E100, ADU-310 */
> >>  	{ USB_DEVICE(ANYDATA_VENDOR_ID, ANYDATA_PRODUCT_ADU_500A) },
> >>  	{ USB_DEVICE(ANYDATA_VENDOR_ID, ANYDATA_PRODUCT_ADU_620UW) },

Johan