linux-kernel - Re: [PATCH] USB: serial: option: add UNISOC vendor and TOZED LT70C product

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Message-ID: <ZD1VeoJtd5FaDt5J@hovoldconsulting.com>
Date:   Mon, 17 Apr 2023 16:19:38 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Arınç ÜNAL <arinc.unal@...nc9.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bjørn Mork <bjorn@...k.no>, me@...nan.com,
        erkin.bozoglu@...ont.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] USB: serial: option: add UNISOC vendor and TOZED LT70C
 product

On Mon, Apr 17, 2023 at 01:42:05PM +0300, Arınç ÜNAL wrote:
> On 13.04.2023 18:14, Johan Hovold wrote:
> > On Thu, Apr 06, 2023 at 08:50:04AM +0300, arinc9.unal@...il.com wrote:
> >> From: Arınç ÜNAL <arinc.unal@...nc9.com>
> >>
> >> Add UNISOC vendor ID and TOZED LT70-C modem which is based from UNISOC
> >> SL8563. The modem supports the NCM mode.
> > 
> > Thanks for the patch. Looks mostly good, but see my comments below.
> 
> Thanks a lot for looking at this Johan!
> 
> > 
> >> T:  Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  6 Spd=480  MxCh= 0
> >> D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
> >> P:  Vendor=1782 ProdID=4055 Rev=04.04
> >> S:  Manufacturer=Unisoc Phone
> >> S:  Product=Unisoc Phone
> >> S:  SerialNumber=<redacted>
> >> C:  #Ifs=14 Cfg#= 1 Atr=c0 MxPwr=500mA
> >> I:  If#= 0 Alt= 0 #EPs= 1 Cls=02(commc) Sub=0d Prot=00 Driver=cdc_ncm
> >> E:  Ad=82(I) Atr=03(Int.) MxPS=  16 Ivl=32ms
> >> I:  If#= 1 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=01 Driver=cdc_ncm
> >> E:  Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> >> E:  Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> >> I:  If#=10 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> >> E:  Ad=07(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> >> E:  Ad=8b(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> >> I:  If#=11 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> >> E:  Ad=08(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> >> E:  Ad=8c(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> >> I:  If#=12 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=42 Prot=01 Driver=option
> >> E:  Ad=09(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> >> E:  Ad=8d(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> > 
> > This looks like an ADB interface which should be blacklisted (reserved)
> > so that the driver does not bind to it.
> 
> Will do.
> 
> > 
> >> I:  If#=13 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> >> E:  Ad=0a(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> >> E:  Ad=8e(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> >> I:  If#= 2 Alt= 0 #EPs= 1 Cls=02(commc) Sub=0d Prot=00 Driver=cdc_ncm
> >> E:  Ad=84(I) Atr=03(Int.) MxPS=  16 Ivl=32ms
> >> I:  If#= 3 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=01 Driver=cdc_ncm
> >> E:  Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> >> E:  Ad=83(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> >> I:  If#= 4 Alt= 0 #EPs= 1 Cls=02(commc) Sub=0d Prot=00 Driver=cdc_ncm
> >> E:  Ad=86(I) Atr=03(Int.) MxPS=  16 Ivl=32ms
> >> I:  If#= 5 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=01 Driver=cdc_ncm
> >> E:  Ad=03(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> >> E:  Ad=85(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> >> I:  If#= 6 Alt= 0 #EPs= 1 Cls=02(commc) Sub=0d Prot=00 Driver=cdc_ncm
> >> E:  Ad=88(I) Atr=03(Int.) MxPS=  16 Ivl=32ms
> >> I:  If#= 7 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=01 Driver=cdc_ncm
> >> E:  Ad=04(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> >> E:  Ad=87(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> >> I:  If#= 8 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> >> E:  Ad=05(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> >> E:  Ad=89(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> >> I:  If#= 9 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> >> E:  Ad=06(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> >> E:  Ad=8a(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms

> >> ---
> >>   drivers/usb/serial/option.c | 6 ++++++
> >>   1 file changed, 6 insertions(+)
> >>
> >> diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
> >> index f31cc3c76329..65a050a9ca39 100644
> >> --- a/drivers/usb/serial/option.c
> >> +++ b/drivers/usb/serial/option.c
> >> @@ -595,6 +595,11 @@ static void option_instat_callback(struct urb *urb);
> >>   #define SIERRA_VENDOR_ID			0x1199
> >>   #define SIERRA_PRODUCT_EM9191			0x90d3
> >>   
> >> +/* UNISOC (Spreadtrum) products */
> >> +#define UNISOC_VENDOR_ID			0x1782
> >> +/* TOZED TL70-C based on UNISOC SL8563 uses UNISOC's vendor ID */
> >> +#define TOZED_PRODUCT_LT70C			0x4055
> >> +
> >>   /* Device flags */
> >>   
> >>   /* Highest interface number which can be used with NCTRL() and RSVD() */
> >> @@ -2225,6 +2230,7 @@ static const struct usb_device_id option_ids[] = {
> >>   	{ USB_DEVICE_AND_INTERFACE_INFO(OPPO_VENDOR_ID, OPPO_PRODUCT_R11, 0xff, 0xff, 0x30) },
> >>   	{ USB_DEVICE_AND_INTERFACE_INFO(SIERRA_VENDOR_ID, SIERRA_PRODUCT_EM9191, 0xff, 0xff, 0x30) },
> >>   	{ USB_DEVICE_AND_INTERFACE_INFO(SIERRA_VENDOR_ID, SIERRA_PRODUCT_EM9191, 0xff, 0, 0) },
> >> +	{ USB_DEVICE(UNISOC_VENDOR_ID, TOZED_PRODUCT_LT70C) },
> > 
> > You should match also on the interface class so that you don't try to
> > bind to the cdc interfaces. See USB_DEVICE_INTERFACE_CLASS() (and
> > RSVD() for the ADB interface).
> 
> Thanks, the final result should look like this:
> 
> { USB_DEVICE_INTERFACE_CLASS(UNISOC_VENDOR_ID, TOZED_PRODUCT_LT70C, 0xff),
>    .driver_info = RSVD(12) },

Alternatively, it looks like you could use
USB_DEVICE_AND_INTERFACE_INFO() and match on ff/0/0. That's generally
preferred as it works also if the interface numbers can change.

Johan