staging.inyokaproject.org

~$ dmesg | tail
[16130.202144] usb 4-1: USB disconnect, device number 2
[16134.494705] usb 4-1: new low-speed USB device number 3 using ohci-pci
[16134.696692] usb 4-1: New USB device found, idVendor=04b4, idProduct=0100, bcdDevice= 0.00
[16134.696698] usb 4-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[16134.696702] usb 4-1: Product: USB IR Receiver
[16134.696705] usb 4-1: Manufacturer: Formosa21
[16134.706279] input: Formosa21 USB IR Receiver Keyboard as /devices/pci0000:00/0000:00:13.0/usb4/4-1/4-1:1.0/0003:04B4:0100.0006/input/input30
[16134.763162] input: Formosa21 USB IR Receiver System Control as /devices/pci0000:00/0000:00:13.0/usb4/4-1/4-1:1.0/0003:04B4:0100.0006/input/input31
[16134.763387] hid-generic 0003:04B4:0100.0006: input,hidraw1: USB HID v1.11 Keyboard [Formosa21 USB IR Receiver] on usb-0000:00:13.0-1/input0

~$ udevadm info --query=all --attribute-walk --name=/dev/input/event3

Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/devices/pci0000:00/0000:00:13.0/usb4/4-1/4-1:1.0/0003:04B4:0100.0006/input/input30/event3':
    KERNEL=="event3"
    SUBSYSTEM=="input"
    DRIVER==""

  looking at parent device '/devices/pci0000:00/0000:00:13.0/usb4/4-1/4-1:1.0/0003:04B4:0100.0006/input/input30':
    KERNELS=="input30"
    SUBSYSTEMS=="input"
    DRIVERS==""
    ATTRS{name}=="Formosa21 USB IR Receiver Keyboard"
    ATTRS{phys}=="usb-0000:00:13.0-1/input0"
    ATTRS{uniq}==""
    ATTRS{properties}=="0"

  looking at parent device '/devices/pci0000:00/0000:00:13.0/usb4/4-1/4-1:1.0/0003:04B4:0100.0006':
    KERNELS=="0003:04B4:0100.0006"
    SUBSYSTEMS=="hid"
    DRIVERS=="hid-generic"
    ATTRS{country}=="00"

  looking at parent device '/devices/pci0000:00/0000:00:13.0/usb4/4-1/4-1:1.0':
    KERNELS=="4-1:1.0"
    SUBSYSTEMS=="usb"
    DRIVERS=="usbhid"
    ATTRS{bInterfaceProtocol}=="02"
    ATTRS{bNumEndpoints}=="01"
    ATTRS{authorized}=="1"
    ATTRS{bAlternateSetting}==" 0"
    ATTRS{supports_autosuspend}=="1"
    ATTRS{bInterfaceNumber}=="00"
    ATTRS{bInterfaceClass}=="03"
    ATTRS{bInterfaceSubClass}=="01"

  looking at parent device '/devices/pci0000:00/0000:00:13.0/usb4/4-1':
    KERNELS=="4-1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{rx_lanes}=="1"
    ATTRS{quirks}=="0x0"
    ATTRS{devnum}=="3"
    ATTRS{authorized}=="1"
    ATTRS{bMaxPower}=="100mA"
    ATTRS{busnum}=="4"
    ATTRS{tx_lanes}=="1"
    ATTRS{manufacturer}=="Formosa21"
    ATTRS{bDeviceClass}=="00"
    ATTRS{maxchild}=="0"
    ATTRS{devpath}=="1"
    ATTRS{configuration}==""
    ATTRS{idProduct}=="0100"
    ATTRS{version}==" 2.00"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bMaxPacketSize0}=="8"
    ATTRS{removable}=="unknown"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{urbnum}=="12"
    ATTRS{idVendor}=="04b4"
    ATTRS{product}=="USB IR Receiver"
    ATTRS{ltm_capable}=="no"
    ATTRS{speed}=="1.5"
    ATTRS{bcdDevice}=="0000"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bmAttributes}=="80"

  looking at parent device '/devices/pci0000:00/0000:00:13.0/usb4':
    KERNELS=="usb4"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{rx_lanes}=="1"
    ATTRS{ltm_capable}=="no"
    ATTRS{manufacturer}=="Linux 5.4.0-29-generic ohci_hcd"
    ATTRS{bMaxPower}=="0mA"
    ATTRS{idVendor}=="1d6b"
    ATTRS{devnum}=="1"
    ATTRS{tx_lanes}=="1"
    ATTRS{busnum}=="4"
    ATTRS{removable}=="unknown"
    ATTRS{idProduct}=="0001"
    ATTRS{maxchild}=="5"
    ATTRS{bcdDevice}=="0504"
    ATTRS{bmAttributes}=="e0"
    ATTRS{interface_authorized_default}=="1"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bDeviceClass}=="09"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{product}=="OHCI PCI host controller"
    ATTRS{version}==" 1.10"
    ATTRS{quirks}=="0x0"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{speed}=="12"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{authorized_default}=="1"
    ATTRS{configuration}==""
    ATTRS{authorized}=="1"
    ATTRS{devpath}=="0"
    ATTRS{urbnum}=="65"
    ATTRS{serial}=="0000:00:13.0"
    ATTRS{bDeviceSubClass}=="00"

  looking at parent device '/devices/pci0000:00/0000:00:13.0':
    KERNELS=="0000:00:13.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="ohci-pci"
    ATTRS{consistent_dma_mask_bits}=="32"
    ATTRS{device}=="0x7807"
    ATTRS{vendor}=="0x1022"
    ATTRS{msi_bus}=="1"
    ATTRS{subsystem_vendor}=="0x1849"
    ATTRS{local_cpus}=="f"
    ATTRS{numa_node}=="-1"
    ATTRS{dma_mask_bits}=="32"
    ATTRS{irq}=="18"
    ATTRS{subsystem_device}=="0x7807"
    ATTRS{driver_override}=="(null)"
    ATTRS{broken_parity_status}=="0"
    ATTRS{enable}=="1"
    ATTRS{ari_enabled}=="0"
    ATTRS{class}=="0x0c0310"
    ATTRS{local_cpulist}=="0-3"
    ATTRS{d3cold_allowed}=="0"
    ATTRS{revision}=="0x11"

  looking at parent device '/devices/pci0000:00':
    KERNELS=="pci0000:00"
    SUBSYSTEMS==""
    DRIVERS==""