# udevadm info --name=input/event12
P: /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1:1.0/input/input13/event12
N: input/event12
S: input/by-id/usb-Saitek_Saitek_Pro_Flight_Rudder_Pedals-event-joystick
S: input/by-path/pci-0000:00:1a.0-usb-0:1.1:1.0-event-joystick
E: DEVLINKS=/dev/input/by-id/usb-Saitek_Saitek_Pro_Flight_Rudder_Pedals-event-joystick /dev/input/by-path/pci-0000:00:1a.0-usb-0:1.1:1.0-event-joystick
E: DEVNAME=/dev/input/event12
E: DEVPATH=/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1:1.0/input/input13/event12
E: ID_BUS=usb
E: ID_FOR_SEAT=input-pci-0000_00_1a_0-usb-0_1_1_1_0
E: ID_INPUT=1
E: ID_INPUT_JOYSTICK=1
E: ID_MODEL=Saitek_Pro_Flight_Rudder_Pedals
E: ID_MODEL_ENC=Saitek\x20Pro\x20Flight\x20Rudder\x20Pedals
E: ID_MODEL_ID=0763
E: ID_PATH=pci-0000:00:1a.0-usb-0:1.1:1.0
E: ID_PATH_TAG=pci-0000_00_1a_0-usb-0_1_1_1_0
E: ID_REVISION=0100
E: ID_SERIAL=Saitek_Saitek_Pro_Flight_Rudder_Pedals
E: ID_TYPE=hid
E: ID_USB_DRIVER=usbhid
E: ID_USB_INTERFACES=:030000:
E: ID_USB_INTERFACE_NUM=00
E: ID_VENDOR=Saitek
E: ID_VENDOR_ENC=Saitek
E: ID_VENDOR_ID=06a3
E: MAJOR=13
E: MINOR=76
E: SUBSYSTEM=input
E: TAGS=:seat:uaccess:
E: USEC_INITIALIZED=97854960



# udevadm test-builtin input_id /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1:1.0/input/input13/event12
calling: test-builtin
=== trie on-disk ===
tool version:          204
file size:         5675621 bytes
header size             80 bytes
strings            1270093 bytes
nodes              4405448 bytes
load module index
ID_INPUT=1
capabilities/ev raw kernel attribute: 9
capabilities/ev decoded bit map:
  bit    0: 0000000000000009
capabilities/abs raw kernel attribute: 23
capabilities/abs decoded bit map:
  bit    0: 0000000000000023
capabilities/rel raw kernel attribute: 0
capabilities/rel decoded bit map:
capabilities/key raw kernel attribute: 0
capabilities/key decoded bit map:
test_key: no EV_KEY capability
unload module index


# udevadm info --attribute-walk --name=input/event12

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/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1:1.0/input/input13/event12':
    KERNEL=="event12"
    SUBSYSTEM=="input"
    DRIVER==""

  looking at parent device '/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1:1.0/input/input13':
    KERNELS=="input13"
    SUBSYSTEMS=="input"
    DRIVERS==""
    ATTRS{name}=="Saitek Saitek Pro Flight Rudder Pedals"
    ATTRS{phys}=="usb-0000:00:1a.0-1.1/input0"
    ATTRS{uniq}==""
    ATTRS{properties}=="0"

  looking at parent device '/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1:1.0':
    KERNELS=="1-1.1:1.0"
    SUBSYSTEMS=="usb"
    DRIVERS=="usbhid"
    ATTRS{bInterfaceClass}=="03"
    ATTRS{bInterfaceSubClass}=="00"
    ATTRS{bInterfaceProtocol}=="00"
    ATTRS{bNumEndpoints}=="01"
    ATTRS{supports_autosuspend}=="1"
    ATTRS{bAlternateSetting}==" 0"
    ATTRS{bInterfaceNumber}=="00"

  looking at parent device '/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1':
    KERNELS=="1-1.1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{devpath}=="1.1"
    ATTRS{idVendor}=="06a3"
    ATTRS{speed}=="12"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="8"
    ATTRS{busnum}=="1"
    ATTRS{devnum}=="7"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="100mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="80"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="0"
    ATTRS{bcdDevice}=="0100"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{version}==" 2.00"
    ATTRS{urbnum}=="15"
    ATTRS{ltm_capable}=="no"
    ATTRS{manufacturer}=="Saitek"
    ATTRS{removable}=="removable"
    ATTRS{idProduct}=="0763"
    ATTRS{bDeviceClass}=="00"
    ATTRS{product}=="Saitek Pro Flight Rudder Pedals"

  looking at parent device '/devices/pci0000:00/0000:00:1a.0/usb1/1-1':
    KERNELS=="1-1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="01"
    ATTRS{devpath}=="1"
    ATTRS{idVendor}=="8087"
    ATTRS{speed}=="480"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{busnum}=="1"
    ATTRS{devnum}=="2"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="0mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="e0"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="6"
    ATTRS{bcdDevice}=="0000"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{version}==" 2.00"
    ATTRS{urbnum}=="72"
    ATTRS{ltm_capable}=="no"
    ATTRS{removable}=="fixed"
    ATTRS{idProduct}=="0024"
    ATTRS{bDeviceClass}=="09"

  looking at parent device '/devices/pci0000:00/0000:00:1a.0/usb1':
    KERNELS=="usb1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{devpath}=="0"
    ATTRS{idVendor}=="1d6b"
    ATTRS{speed}=="480"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{authorized_default}=="1"
    ATTRS{busnum}=="1"
    ATTRS{devnum}=="1"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="0mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="e0"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="2"
    ATTRS{bcdDevice}=="0311"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{serial}=="0000:00:1a.0"
    ATTRS{version}==" 2.00"
    ATTRS{urbnum}=="24"
    ATTRS{ltm_capable}=="no"
    ATTRS{manufacturer}=="Linux 3.11.0-15-generic ehci_hcd"
    ATTRS{removable}=="unknown"
    ATTRS{idProduct}=="0002"
    ATTRS{bDeviceClass}=="09"
    ATTRS{product}=="EHCI Host Controller"

  looking at parent device '/devices/pci0000:00/0000:00:1a.0':
    KERNELS=="0000:00:1a.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="ehci-pci"
    ATTRS{irq}=="16"
    ATTRS{subsystem_vendor}=="0x1458"
    ATTRS{broken_parity_status}=="0"
    ATTRS{class}=="0x0c0320"
    ATTRS{companion}==""
    ATTRS{consistent_dma_mask_bits}=="32"
    ATTRS{dma_mask_bits}=="32"
    ATTRS{local_cpus}=="00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000003"
    ATTRS{device}=="0x1e2d"
    ATTRS{uframe_periodic_max}=="100"
    ATTRS{msi_bus}==""
    ATTRS{local_cpulist}=="0-1"
    ATTRS{vendor}=="0x8086"
    ATTRS{subsystem_device}=="0x5006"
    ATTRS{numa_node}=="-1"
    ATTRS{d3cold_allowed}=="1"

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