USB: serial: option: add Compal EXC-T1 support

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The Compal EXC-T1 is a Qualcomm MDM9207-based LTE modem which reports
"EXC-x1" as its USB product string. It exposes diagnostic, modem, AT,
and NMEA ports as vendor-specific interfaces with subclass 0x10 and
protocols 0x01 through 0x04.

Add exact interface matches for these four ports, leaving the ff/ff/ff
interface unbound.

Relevant output from usb-devices:

T:  Bus=03 Lev=02 Prnt=03 Port=03 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=04b7 ProdID=4d22 Rev=03.18
S:  Manufacturer=CEI
S:  Product=EXC-x1
C:  #Ifs= 6 Cfg#= 1 Atr=a0 MxPwr=500mA
I:  If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=10 Prot=01 Driver=option
I:  If#= 1 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=10 Prot=02 Driver=option
I:  If#= 2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=10 Prot=03 Driver=option
I:  If#= 3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=10 Prot=04 Driver=option
I:  If#= 4 Alt= 0 #EPs= 1 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)
I:  If#= 5 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=10 Prot=05 Driver=qmi_wwan

Tested on a Compal EXC-T1 modem using an Ubuntu kernel build. The four
serial interfaces bound to option and exposed ttyUSB3 through ttyUSB6.

Assisted-by: Codex:GPT-5
Signed-off-by: Ian Lin <ian.lin@jetone.com.tw>
Cc: stable@vger.kernel.org
Signed-off-by: Johan Hovold <johan@kernel.org>

...

This commit is contained in:

Ian Lin 2026-09-04 16:00:46 +08:00 • committed by Johan Hovold

parent 6177bcd94b

commit b51faf3f2e

1 changed files with 4 additions and 0 deletions

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drivers/usb/serial/option.c

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