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# lsusb
Bus 001 Device 006: ID 12d1:15c1 Huawei Technologies Co., Ltd. 
Bus 001 Device 002: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

#dmesg
usb 1-1.2: USB disconnect, device number 6
cdc_ether 1-1.2:2.0 usb0: unregister 'cdc_ether' usb-ci_hdrc.1-1.2, CDC Ethernet Device
usb 1-1.2: new high-speed USB device number 7 using ci_hdrc
cdc_ether 1-1.2:2.0 usb0: register 'cdc_ether' at usb-ci_hdrc.1-1.2, CDC Ethernet Device, 02:1e:10:1f:00:00

#lsmod
Module                  Size  Used by
option                 19419  0 
usb_wwan                5083  1 option
usbserial              19334  2 option,usb_wwan
cdc_ether               3248  0 
usbnet                 16392  1 cdc_ether
adv7180_tvin            9517  0 
evbug                   1476  0 

# rmmod option
# modprobe option
# dmesg
usbserial: USB Serial deregistering driver GSM modem (1-port)
usbcore: deregistering interface driver option
usbcore: registered new interface driver option
usbserial: USB Serial support registered for GSM modem (1-port)

# rmmod option
# rmmod usb_wwan
# rmmod usbserial
# modprobe usbserial vendor=0x12d1 product=0x15c1
# dmesg 
usbcore: registered new interface driver usbserial
usbcore: registered new interface driver usbserial_generic
usbserial: USB Serial support registered for generic
usbserial_generic 1-1.2:2.2: The "generic" usb-serial driver is only for testing and one-off prototypes.
usbserial_generic 1-1.2:2.2: Tell linux-usb@vger.kernel.org to add your device to a proper driver.
usbserial_generic 1-1.2:2.2: generic converter detected
usb 1-1.2: generic converter now attached to ttyUSB0
usbserial_generic 1-1.2:2.3: The "generic" usb-serial driver is only for testing and one-off prototypes.
usbserial_generic 1-1.2:2.3: Tell linux-usb@vger.kernel.org to add your device to a proper driver.
usbserial_generic 1-1.2:2.3: generic converter detected
usb 1-1.2: generic converter now attached to ttyUSB1
usbserial_generic 1-1.2:2.4: The "generic" usb-serial driver is only for testing and one-off prototypes.
usbserial_generic 1-1.2:2.4: Tell linux-usb@vger.kernel.org to add your device to a proper driver.
usbserial_generic 1-1.2:2.4: generic converter detected
usb 1-1.2: generic converter now attached to ttyUSB2
usbserial_generic 1-1.2:2.5: The "generic" usb-serial driver is only for testing and one-off prototypes.
usbserial_generic 1-1.2:2.5: Tell linux-usb@vger.kernel.org to add your device to a proper driver.
usbserial_generic 1-1.2:2.5: generic converter detected
usb 1-1.2: generic converter now attached to ttyUSB3
usbserial_generic 1-1.2:2.6: The "generic" usb-serial driver is only for testing and one-off prototypes.
usbserial_generic 1-1.2:2.6: Tell linux-usb@vger.kernel.org to add your device to a proper driver.
usbserial_generic 1-1.2:2.6: generic converter detected
usb 1-1.2: generic converter now attached to ttyUSB4