Re: [PATCH] USB: serial: option: Add MeiG Smart SRT853

[Lars Melin]

On 2026-03-23 21:37, Ernestas Kulik wrote:
> This commit adds support for the MeiG Smart SRT853 5G CPE modem.
>
> If#= 0: RNDIS
> If#= 1: RNDIS
> If#= 2: Diag
> If#= 3: AT
> If#= 4: AT
> If#= 5: NMEA
>
> T:  Bus=01 Lev=02 Prnt=02 Port=00 Cnt=01 Dev#= 19 Spd=480  MxCh= 0
> D:  Ver= 2.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
> P:  Vendor=2dee ProdID=4d38 Rev= 5.04
> S:  Manufacturer=MEIG
> S:  Product=LTE-A Module
> S:  SerialNumber=da47a175
> C:* #Ifs= 6 Cfg#= 1 Atr=80 MxPwr=500mA
> A:  FirstIf#= 0 IfCount= 2 Cls=e0(wlcon) Sub=01 Prot=03
> I:* If#= 0 Alt= 0 #EPs= 1 Cls=e0(wlcon) Sub=01 Prot=03 Driver=rndis_host
> E:  Ad=81(I) Atr=03(Int.) MxPS=   8 Ivl=32ms
> I:* If#= 1 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=rndis_host
> E:  Ad=8e(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> E:  Ad=0f(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> I:* If#= 2 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=30 Driver=option
> E:  Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> E:  Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> I:* If#= 3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=40 Driver=option
> E:  Ad=84(I) Atr=03(Int.) MxPS=  10 Ivl=32ms
> E:  Ad=83(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> E:  Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> I:* If#= 4 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=40 Driver=option
> E:  Ad=86(I) Atr=03(Int.) MxPS=  10 Ivl=32ms
> E:  Ad=85(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> E:  Ad=03(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> I:* If#= 5 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=60 Driver=option
> E:  Ad=88(I) Atr=03(Int.) MxPS=  10 Ivl=32ms
> E:  Ad=87(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> E:  Ad=04(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
>
> Signed-off-by: Ernestas Kulik <ernestas.k@xxxxxxxxxxxxxxxxxx>
> ---
>   drivers/usb/serial/option.c | 3 +++
>   1 file changed, 3 insertions(+)
>
> diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
> index e349ed66d2ac..328f14a99953 100644
> --- a/drivers/usb/serial/option.c
> +++ b/drivers/usb/serial/option.c
> @@ -2439,10 +2439,13 @@ static const struct usb_device_id option_ids[] = {
>   	{ USB_DEVICE_AND_INTERFACE_INFO(0x2dee, 0x4d22, 0xff, 0x10, 0x02) },	/* MeiG Smart SLM828 */
>   	{ USB_DEVICE_AND_INTERFACE_INFO(0x2dee, 0x4d22, 0xff, 0x10, 0x03) },	/* MeiG Smart SLM828 */
>   	{ USB_DEVICE_AND_INTERFACE_INFO(0x2dee, 0x4d22, 0xff, 0xff, 0x30) },	/* MeiG Smart SRM815 and SRM825L */
>   	{ USB_DEVICE_AND_INTERFACE_INFO(0x2dee, 0x4d22, 0xff, 0xff, 0x40) },	/* MeiG Smart SRM825L */
>   	{ USB_DEVICE_AND_INTERFACE_INFO(0x2dee, 0x4d22, 0xff, 0xff, 0x60) },	/* MeiG Smart SRM825L */
> +	{ USB_DEVICE_AND_INTERFACE_INFO(0x2dee, 0x4d38, 0xff, 0xff, 0x30) },	/* MeiG Smart SRT853 (Diag) */
> +	{ USB_DEVICE_AND_INTERFACE_INFO(0x2dee, 0x4d38, 0xff, 0xff, 0x40) },	/* MeiG Smart SRT853 (AT) */
> +	{ USB_DEVICE_AND_INTERFACE_INFO(0x2dee, 0x4d38, 0xff, 0xff, 0x60) },	/* MeiG Smart SRT853 (NMEA) */
>   	{ USB_DEVICE_INTERFACE_CLASS(0x2df3, 0x9d03, 0xff) },			/* LongSung M5710 */
>   	{ USB_DEVICE_INTERFACE_CLASS(0x305a, 0x1404, 0xff) },			/* GosunCn GM500 RNDIS */
>   	{ USB_DEVICE_INTERFACE_CLASS(0x305a, 0x1405, 0xff) },			/* GosunCn GM500 MBIM */
>   	{ USB_DEVICE_INTERFACE_CLASS(0x305a, 0x1406, 0xff) },			/* GosunCn GM500 ECM/NCM */
>   	{ USB_DEVICE(0x33f8, 0x0104),						/* Rolling RW101-GL (laptop RMNET) */

Hi Ernestas,
the SRT835 is the name of a CPE that is available in more than one 
configuration depending on the installed 5G card.
You can not use the CPE name when adding linux driver support, please
find out the type of Meig 5G card (SRMxxx) it is you want to add support 
for.
You may have to open up the SRT835 in order to find the name of the 
installed 5G card/5G module.

thanks
Lars