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  1. root@ubuntu:~# lsusb
  2. Bus 001 Device 002: ID 090c:1000 Silicon Motion, Inc. - Taiwan (formerly Feiya Technology Corp.) Flash Drive
  3. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  4. Bus 002 Device 003: ID 0e0f:0002 VMware, Inc. Virtual USB Hub
  5. Bus 002 Device 002: ID 0e0f:0003 VMware, Inc. Virtual Mouse
  6. Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  7. root@ubuntu:~# udevadm info -a -p $(udevadm info -q path -n /dev/bus/usb/001/002)
  8.  
  9. Udevadm info starts with the device specified by the devpath and then
  10. walks up the chain of parent devices. It prints for every device
  11. found, all possible attributes in the udev rules key format.
  12. A rule to match, can be composed by the attributes of the device
  13. and the attributes from one single parent device.
  14.  
  15.   looking at device '//devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1':
  16.     KERNEL=="1-1"
  17.     SUBSYSTEM=="usb"
  18.     DRIVER=="usb"
  19.     ATTR{bcdDevice}=="1100"
  20.     ATTR{bDeviceSubClass}=="00"
  21.     ATTR{idVendor}=="090c"
  22.     ATTR{rx_lanes}=="1"
  23.     ATTR{bNumInterfaces}==" 1"
  24.     ATTR{bConfigurationValue}=="1"
  25.     ATTR{urbnum}=="14099"
  26.     ATTR{maxchild}=="0"
  27.     ATTR{bMaxPacketSize0}=="64"
  28.     ATTR{bmAttributes}=="80"
  29.     ATTR{devnum}=="2"
  30.     ATTR{serial}=="AA04012700012659"
  31.     ATTR{quirks}=="0x0"
  32.     ATTR{tx_lanes}=="1"
  33.     ATTR{bDeviceClass}=="00"
  34.     ATTR{idProduct}=="1000"
  35.     ATTR{version}==" 2.00"
  36.     ATTR{devpath}=="1"
  37.     ATTR{removable}=="unknown"
  38.     ATTR{configuration}==""
  39.     ATTR{busnum}=="1"
  40.     ATTR{speed}=="480"
  41.     ATTR{bMaxPower}=="100mA"
  42.     ATTR{ltm_capable}=="no"
  43.     ATTR{authorized}=="1"
  44.     ATTR{bNumConfigurations}=="1"
  45.     ATTR{avoid_reset_quirk}=="0"
  46.     ATTR{bDeviceProtocol}=="00"
  47.  
  48.   looking at parent device '//devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1':
  49.     KERNELS=="usb1"
  50.     SUBSYSTEMS=="usb"
  51.     DRIVERS=="usb"
  52.     ATTRS{ltm_capable}=="no"
  53.     ATTRS{product}=="EHCI Host Controller"
  54.     ATTRS{maxchild}=="6"
  55.     ATTRS{version}==" 2.00"
  56.     ATTRS{rx_lanes}=="1"
  57.     ATTRS{authorized_default}=="1"
  58.     ATTRS{tx_lanes}=="1"
  59.     ATTRS{busnum}=="1"
  60.     ATTRS{devnum}=="1"
  61.     ATTRS{devpath}=="0"
  62.     ATTRS{configuration}==""
  63.     ATTRS{speed}=="480"
  64.     ATTRS{removable}=="unknown"
  65.     ATTRS{bDeviceProtocol}=="00"
  66.     ATTRS{bcdDevice}=="0500"
  67.     ATTRS{quirks}=="0x0"
  68.     ATTRS{bNumInterfaces}==" 1"
  69.     ATTRS{idProduct}=="0002"
  70.     ATTRS{bNumConfigurations}=="1"
  71.     ATTRS{urbnum}=="41"
  72.     ATTRS{bMaxPacketSize0}=="64"
  73.     ATTRS{serial}=="0000:02:03.0"
  74.     ATTRS{idVendor}=="1d6b"
  75.     ATTRS{bmAttributes}=="e0"
  76.     ATTRS{interface_authorized_default}=="1"
  77.     ATTRS{authorized}=="1"
  78.     ATTRS{bDeviceClass}=="09"
  79.     ATTRS{bDeviceSubClass}=="00"
  80.     ATTRS{bConfigurationValue}=="1"
  81.     ATTRS{bMaxPower}=="0mA"
  82.     ATTRS{avoid_reset_quirk}=="0"
  83.     ATTRS{manufacturer}=="Linux 5.0.0-20-generic ehci_hcd"
  84.  
  85.   looking at parent device '//devices/pci0000:00/0000:00:11.0/0000:02:03.0':
  86.     KERNELS=="0000:02:03.0"
  87.     SUBSYSTEMS=="pci"
  88.     DRIVERS=="ehci-pci"
  89.     ATTRS{local_cpulist}=="0-3"
  90.     ATTRS{class}=="0x0c0320"
  91.     ATTRS{driver_override}=="(null)"
  92.     ATTRS{acpi_index}=="16777752"
  93.     ATTRS{local_cpus}=="00000000,00000000,00000000,0000000f"
  94.     ATTRS{uframe_periodic_max}=="100"
  95.     ATTRS{consistent_dma_mask_bits}=="32"
  96.     ATTRS{numa_node}=="-1"
  97.     ATTRS{label}=="ehci"
  98.     ATTRS{broken_parity_status}=="0"
  99.     ATTRS{ari_enabled}=="0"
  100.     ATTRS{d3cold_allowed}=="0"
  101.     ATTRS{msi_bus}=="1"
  102.     ATTRS{irq}=="17"
  103.     ATTRS{companion}==""
  104.     ATTRS{device}=="0x0770"
  105.     ATTRS{enable}=="1"
  106.     ATTRS{subsystem_vendor}=="0x15ad"
  107.     ATTRS{vendor}=="0x15ad"
  108.     ATTRS{dma_mask_bits}=="32"
  109.     ATTRS{revision}=="0x00"
  110.     ATTRS{subsystem_device}=="0x0770"
  111.  
  112.   looking at parent device '//devices/pci0000:00/0000:00:11.0':
  113.     KERNELS=="0000:00:11.0"
  114.     SUBSYSTEMS=="pci"
  115.     DRIVERS==""
  116.     ATTRS{local_cpus}=="00000000,00000000,00000000,0000000f"
  117.     ATTRS{device}=="0x0790"
  118.     ATTRS{numa_node}=="-1"
  119.     ATTRS{revision}=="0x02"
  120.     ATTRS{d3cold_allowed}=="0"
  121.     ATTRS{dma_mask_bits}=="32"
  122.     ATTRS{msi_bus}=="1"
  123.     ATTRS{vendor}=="0x15ad"
  124.     ATTRS{enable}=="1"
  125.     ATTRS{subsystem_device}=="0x0790"
  126.     ATTRS{consistent_dma_mask_bits}=="32"
  127.     ATTRS{broken_parity_status}=="0"
  128.     ATTRS{subsystem_vendor}=="0x15ad"
  129.     ATTRS{irq}=="0"
  130.     ATTRS{ari_enabled}=="0"
  131.     ATTRS{subordinate_bus_number}=="2"
  132.     ATTRS{local_cpulist}=="0-3"
  133.     ATTRS{driver_override}=="(null)"
  134.     ATTRS{class}=="0x060401"
  135.     ATTRS{secondary_bus_number}=="2"
  136.  
  137.   looking at parent device '//devices/pci0000:00':
  138.     KERNELS=="pci0000:00"
  139.     SUBSYSTEMS==""
  140.     DRIVERS==""
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