The USB configuration of the modems is not understandable, i.e. the individual USB interface information is unclear. For this reason, it is currently not possible, for example, to create the AT interface (for AT commands) automatically. Can you tell us which USB interfaces there are and how they can be identified (bInterfaceClass, bInterfaceSubClass, bInterfaceProtocol).
Thanks in advance
In my testing in Ubuntu, it will create two ports:
/dev/ttyUSB0 and /dev/ttyUSB1
And /dev/ttyUSB0 is the AT command port.
Hmm… I’ll try to describe differently what we need: Is there any information about the USB configuration available (bInterfaceClass, bInterfaceSubClass, bInterfaceProtocol)? Most USB interfaces are not bound to a driver due unknown USB configuration. Could you please describe the exported USB interfaces? E.g. MBIM has bInterfaceClass 123, bInterfaceSubClass 321 …
can you find these information in windows device manager?
I can also show my test below (bus 03 port2)to see if you can find the information you want:
owner@ubuntu:~$ lsusb -t
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M
|__ Port 2: Dev 2, If 0, Class=Hub, Driver=hub/7p, 5000M
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/7p, 12M
|__ Port 1: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 2: Dev 3, If 0, Class=Hub, Driver=hub/7p, 480M
|__ Port 1: Dev 5, If 0, Class=Communications, Driver=cdc_mbim, 480M
|__ Port 1: Dev 5, If 1, Class=CDC Data, Driver=cdc_mbim, 480M
|__ Port 1: Dev 5, If 3, Class=Vendor Specific Class, Driver=qcserial, 480M
|__ Port 1: Dev 5, If 4, Class=Vendor Specific Class, Driver=qcserial, 480M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
|__ Port 2: Dev 2, If 0, Class=Hub, Driver=hub/7p, 12M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/6p, 480M
Bus 003 Device 005: ID 1199:90d3 Sierra Wireless, Inc.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x1199 Sierra Wireless, Inc.
idProduct 0x90d3
bcdDevice 0.06
iManufacturer 1 Sierra Wireless, Incorporated
iProduct 2 Sierra Wireless EM9191
iSerial 3 7821475120012345
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 167
bNumInterfaces 4
bConfigurationValue 1
iConfiguration 4 usb_mbim,serial,diag
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 500mA
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 0
bInterfaceCount 2
bFunctionClass 2 Communications
bFunctionSubClass 14
bFunctionProtocol 0
iFunction 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 2 Communications
bInterfaceSubClass 14
bInterfaceProtocol 0
iInterface 0
CDC Header:
bcdCDC 1.10
CDC Union:
bMasterInterface 0
bSlaveInterface 1
CDC MBIM:
bcdMBIMVersion 1.00
wMaxControlMessage 4096
bNumberFilters 32
bMaxFilterSize 128
wMaxSegmentSize 2048
bmNetworkCapabilities 0x20
8-byte ntb input size
UNRECOGNIZED CDC: 08 24 1c 00 01 40 dc 05
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 8
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 2
iInterface 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 1
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 2
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x8e EP 14 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x0f EP 15 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 3
bAlternateSetting 0
bNumEndpoints 3
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 64
iInterface 0
** UNRECOGNIZED: 05 24 00 10 01
** UNRECOGNIZED: 05 24 01 00 00
** UNRECOGNIZED: 04 24 02 02
** UNRECOGNIZED: 05 24 06 00 00
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x000a 1x 10 bytes
bInterval 9
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 4
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 48
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Binary Object Store Descriptor:
bLength 5
bDescriptorType 15
wTotalLength 42
bNumDeviceCaps 3
USB 2.0 Extension Device Capability:
bLength 7
bDescriptorType 16
bDevCapabilityType 2
bmAttributes 0x00000006
Link Power Management (LPM) Supported
SuperSpeed USB Device Capability:
bLength 10
bDescriptorType 16
bDevCapabilityType 3
bmAttributes 0x00
wSpeedsSupported 0x000f
Device can operate at Low Speed (1Mbps)
Device can operate at Full Speed (12Mbps)
Device can operate at High Speed (480Mbps)
Device can operate at SuperSpeed (5Gbps)
bFunctionalitySupport 1
Lowest fully-functional device speed is Full Speed (12Mbps)
bU1DevExitLat 1 micro seconds
bU2DevExitLat 500 micro seconds
** UNRECOGNIZED: 14 10 0a 00 01 00 00 00 00 11 00 00 30 40 0a 00 b0 40 0a 00
Device Status: 0x0000
(Bus Powered)
Strange. Your decriptors are slightly different from the ones in
You have this for intf #3 (AT port?):
i.e ff/ff/40 instead of the expected ff/00/00 according to the patch in mainline Linux.
The ff/ff/40 thing was someting we (or I at least) thought were related to SDX6x modems, like for example kernel/git/torvalds/linux.git - Linux kernel source tree
I guess we have to reconsider that assumption if what you show there is from a SDX55 modem. Did this change with some firmware revision, or has i always been like that under some condition? If so, what’s that condition?
I agree with @Sascha.Hoewisch that it would be nice to have some authoritative information on this… Been guessing the meaning of vendor specific descriptor layouts for more than 10 years now. Getting it more wrong than right. Some docs would be nice
I used mbpl usb driver instead of option.c
And i am testing with em9191
Is there documentation?
only see this document “Software_Integration_and_Development_Guide_for_Linux_USB_Platforms_R24.pdf” related to USB
You might need to contact distributor to get other document.
