最終更新:2017-06-19 (月) 18:04:01 (4d)  

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Query sysfs or the udev database.

  • udevadm info -q all -n /dev/input/event0

パス

  • --name=, --path=, or absolute path in /dev/ or /sys expected.
  • Linux/sysがルートになるっぽい

デバイスパスから元のデバイスを取得

help

  • udevadm info [OPTIONS] [DEVPATH|FILE]
    Query sysfs or the udev database.
      -h --help                   Print this message
         --version                Print version of the program
      -q --query=TYPE             Query device information:
           name                     Name of device node
           symlink                  Pointing to node
           path                     sysfs device path
           property                 The device properties
           all                      All values
      -p --path=SYSPATH           sysfs device path used for query or attribute walk
      -n --name=NAME              Node or symlink name used for query or attribute walk
      -r --root                   Prepend dev directory to path names
      -a --attribute-walk         Print all key matches walking along the chain
                                  of parent devices
      -d --device-id-of-file=FILE Print major:minor of device containing this file
      -x --export                 Export key/value pairs
      -P --export-prefix          Export the key name with a prefix
      -e --export-db              Export the content of the udev database
      -c --cleanup-db             Clean up the udev database

  • $ udevadm info -q all -n /dev/input/event0
    P: /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0/event0
    N: input/event0
    E: DEVNAME=/dev/input/event0
    E: DEVPATH=/devices/LNXSYSTM:00/LNXPWRBN:00/input/input0/event0
    E: ID_INPUT=1
    E: ID_INPUT_KEY=1
    E: ID_PATH=acpi-LNXPWRBN:00
    E: ID_PATH_TAG=acpi-LNXPWRBN_00
    E: MAJOR=13
    E: MINOR=64
    E: SUBSYSTEM=input
    E: TAGS=:power-switch:
    E: USEC_INITIALIZED=8821
    E: XKBLAYOUT=jp
    E: XKBMODEL=pc105
  • # udevadm info -a -n /dev/input/event5
    
    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/pci0000:00/0000:00:04.0/input/input6/event5':
        KERNEL=="event5"
        SUBSYSTEM=="input"
        DRIVER==""
    
      looking at parent device '/devices/pci0000:00/0000:00:04.0/input/input6':
        KERNELS=="input6"
        SUBSYSTEMS=="input"
        DRIVERS==""
        ATTRS{name}=="VirtualBox mouse integration"
        ATTRS{phys}==""
        ATTRS{uniq}==""
        ATTRS{properties}=="0"
    
      looking at parent device '/devices/pci0000:00/0000:00:04.0':
        KERNELS=="0000:00:04.0"
        SUBSYSTEMS=="pci"
        DRIVERS=="vboxguest"
        ATTRS{irq}=="20"
        ATTRS{subsystem_vendor}=="0x0000"
        ATTRS{broken_parity_status}=="0"
        ATTRS{class}=="0x088000"
        ATTRS{consistent_dma_mask_bits}=="32"
        ATTRS{dma_mask_bits}=="32"
        ATTRS{local_cpus}=="00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000001"
        ATTRS{device}=="0xcafe"
        ATTRS{enable}=="1"
        ATTRS{msi_bus}==""
        ATTRS{local_cpulist}=="0"
        ATTRS{vendor}=="0x80ee"
        ATTRS{subsystem_device}=="0x0000"
        ATTRS{numa_node}=="-1"
        ATTRS{d3cold_allowed}=="0"
    
      looking at parent device '/devices/pci0000:00':
        KERNELS=="pci0000:00"
        SUBSYSTEMS==""
        DRIVERS==""

man

  •    udevadm info options
           Queries the udev database for device information stored in the udev database. It can also query the properties of a device from its
           sysfs representation to help creating udev rules that match this device.
    
           --query=type
               Query the database for specified type of device data. It needs the --path or --name to identify the specified device. Valid queries
               are: name, symlink, path, property, all.
    
           --path=devpath
               The devpath of the device to query.
    
           --name=file
               The name of the device node or a symlink to query
    
           --root
               The udev root directory: /dev. If used in conjunction with a name or symlink query, the query returns the absolute path including
               the root directory.
    
           --run
               The udev runtime directory: /run/udev.
    
           --attribute-walk
               Print all sysfs properties of the specified device that can be used in udev rules to match the specified device. It prints all
               devices along the chain, up to the root of sysfs that can be used in udev rules.
    
           --export
               Print output as key/value pairs. Values are enclosed in single quotes.
    
           --export-prefix=name
               Add a prefix to the key name of exported values.
    
           --device-id-of-file=file
               Print major/minor numbers of the underlying device, where the file lives on.
    
           --export-db
               Export the content of the udev database.
    
           --cleanup-db
               Cleanup the udev database.
    
           --version
               Print version.
    
           --help
               Print help text.