FMeinicke's Wiki

USB devices

3 min read

usb devices udev udevadm ftdi

Source

  • basic info about connected devices

    $ lsusb
Bus 001 Device 012: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC
Bus 001 Device 010: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC
Bus 001 Device 007: ID 0424:ec00 Microchip Technology, Inc. (formerly SMSC) SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 005: ID 0424:9512 Microchip Technology, Inc. (formerly SMSC) SMC9512/9514 USB Hub
Bus 001 Device 017: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC
Bus 001 Device 016: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC
Bus 001 Device 015: ID 1a40:0201 Terminus Technology Inc. FE 2.1 7-port Hub
Bus 001 Device 014: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC
Bus 001 Device 013: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC
Bus 001 Device 011: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC
Bus 001 Device 009: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC
Bus 001 Device 008: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC
Bus 001 Device 006: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC
Bus 001 Device 004: ID 1a40:0201 Terminus Technology Inc. FE 2.1 7-port Hub
Bus 001 Device 003: ID 0424:ec00 Microchip Technology, Inc. (formerly SMSC) SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Microchip Technology, Inc. (formerly SMSC) SMC9514 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

  • tree view of connected devices

    $ lsusb -t
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc2/1p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/5p, 480M
        |__ Port 1: Dev 3, If 0, Class=Vendor Specific Class, Driver=smsc95xx, 480M
        |__ Port 2: Dev 4, If 0, Class=Hub, Driver=hub/7p, 480M
            |__ Port 7: Dev 15, If 0, Class=Hub, Driver=hub/7p, 480M
                |__ Port 1: Dev 16, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 12M
                |__ Port 2: Dev 17, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 12M
            |__ Port 5: Dev 13, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 12M
            |__ Port 3: Dev 9, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 12M
            |__ Port 1: Dev 6, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 12M
            |__ Port 6: Dev 14, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 12M
            |__ Port 4: Dev 11, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 12M
            |__ Port 2: Dev 8, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 12M
        |__ Port 5: Dev 5, If 0, Class=Hub, Driver=hub/3p, 480M
            |__ Port 1: Dev 7, If 0, Class=Vendor Specific Class, Driver=smsc95xx, 480M
            |__ Port 2: Dev 10, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 12M
            |__ Port 3: Dev 12, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 12M

  • get some more-than-basic info

    $ usb-devices
 
T:  Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=480 MxCh= 3
D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=1d6b ProdID=0002 Rev=04.04
S:  Manufacturer=Linux 4.4.0-131-generic ehci_hcd
S:  Product=EHCI Host Controller
S:  SerialNumber=0000:00:1a.0
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

  • get very detailed info (useful for writing udev rules)

    udevadm info --name=/dev/ttyUSB0 --attribute-walk

  • using that info you can create a udev rule, e.g. to create a /dev/your_device_name device that will always be symlinked to the corresponding /dev/ttyUSBx device for that physical USB device

    SUBSYSTEM=="tty", ATTRS{idVendor}=="1234", ATTRS{idProduct}=="5678", SYMLINK+="your_device_name"

  • reload udev rules using

    sudo udevadm control --reload-rules  # or --reload

  • then trigger the rule using

    sudo udevadm trigger

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