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Date:   Mon, 16 Aug 2021 17:47:03 +0200
From:   Reinhard Speyerer <rspmn@...or.de>
To:     Slark Xiao <slark_xiao@....com>
Cc:     johan@...nel.org, gregkh@...uxfoundation.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Re: [PATCH] [V2,1/1]USB: serial: option: add Foxconn T77W175
 composition 0x901d

On Mon, Aug 16, 2021 at 05:17:00PM +0800, Slark Xiao wrote:
> 
> At 2021-08-16 17:04:00, "Reinhard Speyerer" <rspmn@...or.de> wrote:
> >On Mon, Aug 16, 2021 at 11:54:04AM +0800, Slark Xiao wrote:
> >> Foxconn SDX55 T77W175 device is working in PCIe mode normally.
> >> You can find the PCIe support in drivers/bus/mhi/pci_generic.c file.
> >> But in some scenario, we need to capture the memory dump once it crashed.
> >> So a diag port under USB driver is needed.
> >> 
> >> Only interface 0 is used:
> >> jbd@...-ThinkPad-P1-Gen-4:~$ lsusb | grep 05c6
> >> Bus 003 Device 010: ID 05c6:901d Qualcomm, Inc. Generic Mobile Broadband Adapter
> >> jbd@...-ThinkPad-P1-Gen-4:~$ lsusb -t | grep "Dev 10"
> >>     |__ Port 7: Dev 10, If 0, Class=Vendor Specific Class, Driver=option, 480M
> >> 
> >> Signed-off-by: Slark Xiao <slark_xiao@....com>
> >> ---
> >>  drivers/usb/serial/option.c | 1 +
> >>  1 file changed, 1 insertion(+)
> >> 
> >> diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
> >> index 039450069ca4..c275f489c1cc 100644
> >> --- a/drivers/usb/serial/option.c
> >> +++ b/drivers/usb/serial/option.c
> >> @@ -2068,6 +2068,7 @@ static const struct usb_device_id option_ids[] = {
> >>  	  .driver_info = RSVD(0) | RSVD(1) | RSVD(6) },
> >>  	{ USB_DEVICE(0x0489, 0xe0b5),						/* Foxconn T77W968 ESIM */
> >>  	  .driver_info = RSVD(0) | RSVD(1) | RSVD(6) },
> >> +	{ USB_DEVICE(QUALCOMM_VENDOR_ID, 0x901d) },				/* Foxconn T77W175 PCIE+USB mode*/
> >>  	{ USB_DEVICE(0x1508, 0x1001),						/* Fibocom NL668 (IOT version) */
> >>  	  .driver_info = RSVD(4) | RSVD(5) | RSVD(6) },
> >>  	{ USB_DEVICE(0x2cb7, 0x0104),						/* Fibocom NL678 series */
> >> -- 
> >> 2.25.1
> >> 
> >> 
> >
> >Hi Slark,
> >
> >since this entry uses the Qualcomm USB VID it would be a good idea to make
> >the option driver only bind to the DIAG interface in case other UE vendors
> >have the ADB interface provided by this composition enabled:
> > [...]
> 
> Hi Reinhard,
>   So should I use USB_DEVICE_INTERFACE_NUMBER(QUALCOMM_VENDOR_ID, 0x901d, 0x00) to bind Diag port only?
> 
> Thanks

Hi Slark,

I think this would the preferred approach.

I'll let Johan advise on the preferred position of the new entry in the
device id table.

Regards,
Reinhard

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