Longsun u8300c qmi mode missing

Installing and Using OpenWrt
1

I would like to see qmi_wwan support for Longsheng U8300c LTE modem.

vid 1c9e pid 9b05 OMEGA TECHNOLOGY (U8300)
vid 1c9e pid 9b3c OMEGA TECHNOLOGY (U9300)

2

That goes to upstream kernel devs after you confirm forcing driver to device works and submit a patch there.

3

Seems it's there since last year... https://lore.kernel.org/netdev/ZiDKWvLJkfOidH4w@hovoldconsulting.com/T/
https://lore.kernel.org/netdev/20240415142423.1754445-1-coiaprant@gmail.com/T/

3 Likes
4

Hi all. I'm trying to get a Longsun U8300c modem to work. When loading, the modem is defined as "usb modem" and creating only 4 /dev/ttyUSB* devices, but there should be 5 or 6. So qmi does not work, no /dev/cdc-wdm0 interface. I installed all the necessary packages. The modem works in 3G mode. Can anyone tell me where to dig?

T:  Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=480  MxCh= 1
B:  Alloc=  0/800 us ( 0%), #Int=  1, #Iso=  0
D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=1d6b ProdID=0002 Rev= 5.15
S:  Manufacturer=Linux 5.15.167 ehci_hcd
S:  Product=EHCI Host Controller
S:  SerialNumber=101c0000.ehci
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=  0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   4 Ivl=256ms

T:  Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  2 Spd=480  MxCh= 4
D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=01 MxPS=64 #Cfgs=  1
P:  Vendor=05e3 ProdID=0608 Rev=85.36
S:  Product=USB2.0 Hub
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=100mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   1 Ivl=256ms

T:  Bus=01 Lev=02 Prnt=02 Port=01 Cnt=01 Dev#=  3 Spd=480  MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=1c9e ProdID=9b05 Rev= 2.32
S:  Manufacturer=USB Modem
S:  Product=USB Modem
C:* #Ifs= 6 Cfg#= 1 Atr=80 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)
E:  Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 1 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
E:  Ad=83(I) Atr=03(Int.) MxPS=  10 Ivl=32ms
E:  Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
E:  Ad=85(I) Atr=03(Int.) MxPS=  10 Ivl=32ms
E:  Ad=84(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=03(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
E:  Ad=87(I) Atr=03(Int.) MxPS=  10 Ivl=32ms
E:  Ad=86(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=04(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 4 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)
E:  Ad=89(I) Atr=03(Int.) MxPS=   8 Ivl=32ms
E:  Ad=88(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=05(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 5 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=42 Prot=01 Driver=(none)
E:  Ad=8a(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=06(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms

T:  Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=12   MxCh= 1
B:  Alloc=  0/900 us ( 0%), #Int=  0, #Iso=  0
D:  Ver= 1.10 Cls=09(hub  ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=1d6b ProdID=0001 Rev= 5.15
S:  Manufacturer=Linux 5.15.167 ohci_hcd
S:  Product=Generic Platform OHCI controller
S:  SerialNumber=101c1000.ohci
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=  0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   2 Ivl=255ms
5

Do you think asking over and over again will yield you better answers?

Please post ubus call system board from your OpenWRT device.
As a text box, and never paste text as picture.

qmi device works in one mode at any time, you have to set it up properly.
https://openwrt.org/docs/guide-user/network/wan/wwan/ltedongle

1 Like
6

I thought it's not very clever to ask for help in feature request topic. :man_shrugging:

{
	"kernel": "5.15.167",
	"hostname": "OpenWrt",
	"system": "MediaTek MT7628AN ver:1 eco:2",
	"model": "UniElec U7628-01 (16M flash)",
	"board_name": "unielec,u7628-01-16m",
	"rootfs_type": "squashfs",
	"release": {
		"distribution": "OpenWrt",
		"version": "23.05.5",
		"revision": "r24106-10cc5fcd00",
		"target": "ramips/mt76x8",
		"description": "OpenWrt 23.05.5 r24106-10cc5fcd00"
	}
}

I know how to search for user manuals...

7

you need newer kernel, probably 6.10 and above
OR
see if it can be switched from QMI to a different mode like MBIM or ECM

1 Like
8

tired mbim, but got the same results.
I will try to update the firmware. thanks for suggestions.

9

Do you have a manual for this modem and know how to change its modes?
Do you mind sharing?

10

the only document containing modem reference I found is:
MCM management commands

11

where can I read about changing modes?

I updated to 24.10.0-rc7 but nothing changed.

12

Does the RC7 run kernel >=6.10 ?

13 
"kernel": "6.6.73"

I don't know how to build custom firmware with modified kernel...

14
1 Like