Anonymous

Udevinfo 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 '/block/sdc':
    KERNEL=="sdc"
    SUBSYSTEM=="block"
    DRIVER==""
    ATTR{stat}=="      37       28      520      800        0        0        0        0        0      564      800"
    ATTR{size}=="78165360"
    ATTR{removable}=="0"
    ATTR{range}=="16"
    ATTR{dev}=="8:32"

  looking at parent device '/devices/pci0000:00/0000:00:02.2/usb1/1-2/1-2:1.0/host2/target2:0:0/2:0:0:0':
    KERNELS=="2:0:0:0"
    SUBSYSTEMS=="scsi"
    DRIVERS=="sd"
    ATTRS{ioerr_cnt}=="0x0"
    ATTRS{iodone_cnt}=="0x2c"
    ATTRS{iorequest_cnt}=="0x2c"
    ATTRS{iocounterbits}=="32"
    ATTRS{timeout}=="30"
    ATTRS{state}=="running"
    ATTRS{rev}=="0000"
    ATTRS{model}=="A               "
    ATTRS{vendor}=="ST340810"
    ATTRS{scsi_level}=="3"
    ATTRS{type}=="0"
    ATTRS{queue_type}=="none"
    ATTRS{queue_depth}=="1"
    ATTRS{device_blocked}=="0"
    ATTRS{max_sectors}=="240"

  looking at parent device '/devices/pci0000:00/0000:00:02.2/usb1/1-2/1-2:1.0/host2/target2:0:0':
    KERNELS=="target2:0:0"
    SUBSYSTEMS==""
    DRIVERS==""

  looking at parent device '/devices/pci0000:00/0000:00:02.2/usb1/1-2/1-2:1.0/host2':
    KERNELS=="host2"
    SUBSYSTEMS==""
    DRIVERS==""

  looking at parent device '/devices/pci0000:00/0000:00:02.2/usb1/1-2/1-2:1.0':
    KERNELS=="1-2:1.0"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb-storage"
    ATTRS{modalias}=="usb:v04B4p6830d0001dc00dsc00dp00ic08isc06ip50"
    ATTRS{bInterfaceProtocol}=="50"
    ATTRS{bInterfaceSubClass}=="06"
    ATTRS{bInterfaceClass}=="08"
    ATTRS{bNumEndpoints}=="02"
    ATTRS{bAlternateSetting}==" 0"
    ATTRS{bInterfaceNumber}=="00"

  looking at parent device '/devices/pci0000:00/0000:00:02.2/usb1/1-2':
    KERNELS=="1-2"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{serial}=="DEF107679C83"
    ATTRS{product}=="USB2.0 Storage Device"
    ATTRS{manufacturer}=="Cypress Semiconductor"
    ATTRS{maxchild}=="0"
    ATTRS{version}==" 2.00"
    ATTRS{devnum}=="3"
    ATTRS{speed}=="12"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceClass}=="00"
    ATTRS{bcdDevice}=="0001"
    ATTRS{idProduct}=="6830"
    ATTRS{idVendor}=="04b4"
    ATTRS{bMaxPower}=="  0mA"
    ATTRS{bmAttributes}=="c0"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{configuration}==""

  looking at parent device '/devices/pci0000:00/0000:00:02.2/usb1':
    KERNELS=="usb1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{serial}=="0000:00:02.2"
    ATTRS{product}=="OHCI Host Controller"
    ATTRS{manufacturer}=="Linux 2.6.19-ARCH ohci_hcd"
    ATTRS{maxchild}=="3"
    ATTRS{version}==" 1.10"
    ATTRS{devnum}=="1"
    ATTRS{speed}=="12"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceClass}=="09"
    ATTRS{bcdDevice}=="0206"
    ATTRS{idProduct}=="0000"
    ATTRS{idVendor}=="0000"
    ATTRS{bMaxPower}=="  0mA"
    ATTRS{bmAttributes}=="e0"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{configuration}==""

  looking at parent device '/devices/pci0000:00/0000:00:02.2':
    KERNELS=="0000:00:02.2"
    SUBSYSTEMS=="pci"
    DRIVERS=="ohci_hcd"
    ATTRS{msi_bus}==""
    ATTRS{broken_parity_status}=="0"
    ATTRS{modalias}=="pci:v00001039d00007001sv00001039sd00007001bc0Csc03i10"
    ATTRS{local_cpus}=="f"
    ATTRS{irq}=="12"
    ATTRS{class}=="0x0c0310"
    ATTRS{subsystem_device}=="0x7001"
    ATTRS{subsystem_vendor}=="0x1039"
    ATTRS{device}=="0x7001"
    ATTRS{vendor}=="0x1039"

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