参考
file:///Z:/qt-everywhere/marvell/download/udev-142/docs/writing_udev_rules/index.html
和man
http://www.ibm.com/developerworks/cn/linux/l-cn-udev/index.html
http://www.linuxsky.org/doc/admin/200710/139.html
https://wiki.archlinux.org/index.php/Map_Custom_Device_Entries_with_udev
http://blog.csdn.net/lizzywu/article/details/5985405
http://my.chinaunix.net/space.php?uid=22915173&do=blog&id=68329
https://wiki.archlinux.org/index.php/Udev_%28%E7%AE%80%E4%BD%93%E4%B8%AD%E6%96%87%29
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.
--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.
--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.
--version
Print version.
--help
Print help text.
查询设备的devpath
/dev # udevadm info -q path -n /dev/event0
/devices/platform/ehci_marvell.70059/usb1/1-1/1-1.1/1-1.1:1.0/input/input3/event0
/dev # udevadm info -a -p $(udevadm info -q path -n /dev/event0)
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/platform/ehci_marvell.70059/usb1/1-1/1-1.1/1-1.1:1.0/input/input3/event0':
KERNEL=="event0"
SUBSYSTEM=="input"
DRIVER==""
looking at parent device '/devices/platform/ehci_marvell.70059/usb1/1-1/1-1.1/1-1.1:1.0/input/input3':
KERNELS=="input3"
SUBSYSTEMS=="input"
DRIVERS==""
ATTRS{name}=="Dell Dell USB Keyboard"
ATTRS{phys}=="usb-ehci_marvell.70059-1.1/input0"
ATTRS{uniq}==""
ATTRS{modalias}=="input:b0003v413Cp2105e0110-e0,1,4,11,14,k71,72,73,74,75,77,79,7A,7B,7C,7D,7E,7F,80,81,82,83,84,85,86,87,88,89,8A,8C,8E,96,98,9E,9F,A1,A3,A4,A5,A6,AD,B0,B1,B2,B3,B4,B7,B8,B9,BA,BB,BC,BD,BE,BF,C0,C1,C2,F0,ram4,l0,1,2,sfw"
looking at parent device '/devices/platform/ehci_marvell.70059/usb1/1-1/1-1.1/1-1.1:1.0':
KERNELS=="1-1.1:1.0"
SUBSYSTEMS=="usb"
DRIVERS=="usbhid"
ATTRS{bInterfaceNumber}=="00"
ATTRS{bAlternateSetting}==" 0"
ATTRS{bNumEndpoints}=="01"
ATTRS{bInterfaceClass}=="03"
ATTRS{bInterfaceSubClass}=="01"
ATTRS{bInterfaceProtocol}=="01"
ATTRS{modalias}=="usb:v413Cp2105d0352dc00dsc00dp00ic03isc01ip01"
ATTRS{supports_autosuspend}=="1"
ATTRS{interface}=="EP1 Interrupt"
looking at parent device '/devices/platform/ehci_marvell.70059/usb1/1-1/1-1.1':
KERNELS=="1-1.1"
SUBSYSTEMS=="usb"
DRIVERS=="usb"
ATTRS{configuration}=="Dell USB Keyboard"
ATTRS{bNumInterfaces}==" 1"
ATTRS{bConfigurationValue}=="1"
ATTRS{bmAttributes}=="a0"
ATTRS{bMaxPower}==" 70mA"
ATTRS{urbnum}=="20"
ATTRS{idVendor}=="413c"
ATTRS{idProduct}=="2105"
ATTRS{bcdDevice}=="0352"
ATTRS{bDeviceClass}=="00"
ATTRS{bDeviceSubClass}=="00"
ATTRS{bDeviceProtocol}=="00"
ATTRS{bNumConfigurations}=="1"
ATTRS{bMaxPacketSize0}=="8"
ATTRS{speed}=="1.5"
ATTRS{busnum}=="1"
ATTRS{devnum}=="5"
ATTRS{version}==" 1.10"
ATTRS{maxchild}=="0"
ATTRS{quirks}=="0x1"
ATTRS{authorized}=="1"
ATTRS{manufacturer}=="Dell"
ATTRS{product}=="Dell USB Keyboard"
looking at parent device '/devices/platform/ehci_marvell.70059/usb1/1-1':
KERNELS=="1-1"
SUBSYSTEMS=="usb"
DRIVERS=="usb"
ATTRS{configuration}==""
ATTRS{bNumInterfaces}==" 1"
ATTRS{bConfigurationValue}=="1"
ATTRS{bmAttributes}=="e0"
ATTRS{bMaxPower}==" 2mA"
ATTRS{urbnum}=="65"
ATTRS{idVendor}=="0424"
ATTRS{idProduct}=="2514"
ATTRS{bcdDevice}=="0000"
ATTRS{bDeviceClass}=="09"
ATTRS{bDeviceSubClass}=="00"
ATTRS{bDeviceProtocol}=="02"
ATTRS{bNumConfigurations}=="1"
ATTRS{bMaxPacketSize0}=="64"
ATTRS{speed}=="480"
ATTRS{busnum}=="1"
ATTRS{devnum}=="2"
ATTRS{version}==" 2.00"
ATTRS{maxchild}=="4"
ATTRS{quirks}=="0x1"
ATTRS{authorized}=="1"
looking at parent device '/devices/platform/ehci_marvell.70059/usb1':
KERNELS=="usb1"
SUBSYSTEMS=="usb"
DRIVERS=="usb"
ATTRS{configuration}==""
ATTRS{bNumInterfaces}==" 1"
ATTRS{bConfigurationValue}=="1"
ATTRS{bmAttributes}=="e0"
ATTRS{bMaxPower}==" 0mA"
ATTRS{urbnum}=="28"
ATTRS{idVendor}=="1d6b"
ATTRS{idProduct}=="0002"
ATTRS{bcdDevice}=="0206"
ATTRS{bDeviceClass}=="09"
ATTRS{bDeviceSubClass}=="00"
ATTRS{bDeviceProtocol}=="01"
ATTRS{bNumConfigurations}=="1"
ATTRS{bMaxPacketSize0}=="64"
ATTRS{speed}=="480"
ATTRS{busnum}=="1"
ATTRS{devnum}=="1"
ATTRS{version}==" 2.00"
ATTRS{maxchild}=="1"
ATTRS{quirks}=="0x1"
ATTRS{authorized}=="1"
ATTRS{manufacturer}=="Linux 2.6.31.8 ehci_hcd"
ATTRS{product}=="Marvell Orion EHCI"
ATTRS{serial}=="ehci_marvell.70059"
ATTRS{authorized_default}=="1"
looking at parent device '/devices/platform/ehci_marvell.70059':
KERNELS=="ehci_marvell.70059"
SUBSYSTEMS=="platform"
DRIVERS=="ehci_marvell"
ATTRS{modalias}=="platform:ehci_marvell"
looking at parent device '/devices/platform':
KERNELS=="platform"
SUBSYSTEMS==""
DRIVERS==""