Issue when doing with Quectel EC21/EC25, ... you can't connect to the device via ADB interface or the device is not shown $ adb devices
Reasons: ADB port node was occupied by option driver
Solution: unbind the option driver for the ADB port. This method is tested in Ubuntu 18.04 LTS, 16.04 LTS.
- Run ADB under userspace
- Understand EC2x USB interface and how to unbind the ADB port under option driver
Next step: write a script to identify the ADB port and unbind accordingly.
For the convience, we need to run the ADB at user level and prepare ADB packages, this can be done using the provided script.
$ sh setup.sh
Plug the EC2x modules to Ubuntu machine via USB and run those commands as root:
# dmesg
[ 11.688113] usb 1-2: new high-speed USB device number 4 using ehci-pci
[ 11.845420] usb 1-2: New USB device found, idVendor=2c7c, idProduct=0125, bcdDevice= 3.18
[ 11.845422] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 11.845423] usb 1-2: Product: Android
[ 11.845424] usb 1-2: Manufacturer: Android
[ 11.863802] option 1-2:1.0: GSM modem (1-port) converter detected
[ 11.864130] usb 1-2: GSM modem (1-port) converter now attached to ttyUSB0
[ 11.864297] option 1-2:1.1: GSM modem (1-port) converter detected
[ 11.864958] usb 1-2: GSM modem (1-port) converter now attached to ttyUSB1
[ 11.865006] option 1-2:1.2: GSM modem (1-port) converter detected
[ 11.865178] usb 1-2: GSM modem (1-port) converter now attached to ttyUSB2
[ 11.865221] option 1-2:1.3: GSM modem (1-port) converter detected
[ 11.865385] usb 1-2: GSM modem (1-port) converter now attached to ttyUSB3
[ 11.869118] qmi_wwan 1-2:1.4: cdc-wdm0: USB WDM device
[ 11.869588] qmi_wwan 1-2:1.4 wwan0: register 'qmi_wwan' at usb-0000:00:1d.7-2, WWAN/QMI device, d6:0a:73:76:e8:7e
[ 11.869894] option 1-2:1.5: GSM modem (1-port) converter detected
[ 11.869990] usb 1-2: GSM modem (1-port) converter now attached to ttyUSB4
[ 11.908316] qmi_wwan 1-2:1.4 wwp0s29f7u2i4: renamed from wwan0# cat /sys/kernel/debug/usb/devices
T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=02 Dev#= 2 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=ef(misc ) Sub=02 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=2c7c ProdID=0125 Rev= 3.18
S: Manufacturer=Android
S: Product=Android
C:* #Ifs= 6 Cfg#= 1 Atr=80 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
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=00 Prot=00 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=00 Prot=00 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=00 Prot=00 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=qmi_wwan
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=option
E: Ad=06(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=8a(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
Check the option driver:
# ls -la /sys/bus/usb/drivers/option/
total 0
drwxr-xr-x 2 root root 0 May 10 10:49 .
drwxr-xr-x 11 root root 0 May 10 10:46 ..
lrwxrwxrwx 1 root root 0 May 10 10:49 1-2:1.0 -> ../../../../devices/pci0000:00/0000:00:1d.7/usb1/1-2/1-2:1.0
lrwxrwxrwx 1 root root 0 May 10 10:49 1-2:1.1 -> ../../../../devices/pci0000:00/0000:00:1d.7/usb1/1-2/1-2:1.1
lrwxrwxrwx 1 root root 0 May 10 10:49 1-2:1.2 -> ../../../../devices/pci0000:00/0000:00:1d.7/usb1/1-2/1-2:1.2
lrwxrwxrwx 1 root root 0 May 10 10:49 1-2:1.3 -> ../../../../devices/pci0000:00/0000:00:1d.7/usb1/1-2/1-2:1.3
lrwxrwxrwx 1 root root 0 May 10 10:49 1-2:1.5 -> ../../../../devices/pci0000:00/0000:00:1d.7/usb1/1-2/1-2:1.5
--w------- 1 root root 4096 May 10 10:49 bind
lrwxrwxrwx 1 root root 0 May 10 10:49 module -> ../../../../module/usbserial
--w------- 1 root root 4096 May 10 10:46 uevent
--w------- 1 root root 4096 May 10 10:49 unbind
For EC2x USB interface, the ports are defined as:
- Port 0: ttyUSB0 --> DM Port
- Port 1: ttyUSB1 --> GNSS port
- Port 2: ttyUSB2 --> AT commands
- Port 3: ttyUSB3 --> PPP and AT commands
- Port 4: QMI interface
- Port 5: ADB --> in this, it is loaded under option driver
ADB Port is "1-2:1.5", thus you need to unbind the ADB port:
# echo "1-2:1.5" > /sys/bus/usb/drivers/option/unbind
Back to normal user, you can see the devices, result:
$ adb devices
List of devices attached
(no serial number) device
Other option is to build the serial driver to ignore the Quectel modules, pls follow this repo: https://github.com/ngohaibac/Quectel_USB_Serial_Driver