[PATCH] USB: serial: option: add Compal EXC-T1 support

[PATCH] USB: serial: option: add Compal EXC-T1 support

[Ian Lin]

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>
---
 drivers/usb/serial/option.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
index 03c3785a1..a42c37450 100644
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -2433,6 +2433,10 @@ static const struct usb_device_id option_ids[] = {
 	  .driver_info = RSVD(5) },
 	{ USB_DEVICE_INTERFACE_CLASS(0x0489, 0xe167, 0xff),                     /* Foxconn T99W640 MBIM */
 	  .driver_info = RSVD(3) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(0x04b7, 0x4d22, 0xff, 0x10, 0x01) },	/* Compal EXC-T1 */
+	{ USB_DEVICE_AND_INTERFACE_INFO(0x04b7, 0x4d22, 0xff, 0x10, 0x02) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(0x04b7, 0x4d22, 0xff, 0x10, 0x03) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(0x04b7, 0x4d22, 0xff, 0x10, 0x04) },
 	{ USB_DEVICE_AND_INTERFACE_INFO(0x04b7, 0x8217, 0xff, 0xff, 0x30) },	/* Compal EXM-G1x */
 	{ USB_DEVICE_AND_INTERFACE_INFO(0x04b7, 0x8217, 0xff, 0xff, 0x40) },
 	{ USB_DEVICE_AND_INTERFACE_INFO(0x04b7, 0x8217, 0xff, 0xff, 0x60) },

base-commit: 7f11480cda081de78a05d8c97073df66326b50b3
-- 
2.43.0