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I want to make udevinfo the standard query interface, so all the user
features of the main udev are copied in here. It is now capable to:
o query the database for a given value
o dump the whole database
o extract all possible device attributes for a sysfs_device
In addition to the known options of udev it supports the query for the
mode of the device node, and it includes the mode in the database dump:
udevinfo -d
P: /class/video4linux/video0
N: video/webcam0
M: 0666
S: camera0 kamera0
O: 500
G: 500
It is also a bit more friendly with the pathnames specified for devices or nodes.
We remove the absolute path or add it if neccessary:
udevinfo -q mode -n video/webcam0
udevinfo -q mode -n /udev/video/webcam0
0666
udevinfo -q mode -p /sys/class/video4linux/video0
udevinfo -q mode -p /class/video4linux/video0
udevinfo -q mode -p class/video4linux/video0
0666
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udevinfo is now capable to print "all" attributes along the device chain
of a sysfs device. Just like udev itself it walks the chain upwards and
prints all usable attributes in the udev key format.
So it should be easy to find unique attributes to compose a rule.
All multiline attribute values and values containing non printable
characters are skipped now. I hope nothing useful gets lost with this :)
NOTE:
The BUS value corresponding with the attributes is printed for every
device. Don't specify BUS= in a rule and mix SYSFS_attributes from
different busses, the rule can't match.
./udevinfo /sys/block/sda/sda1
device '/sys/block/sda/sda1' has major:minor 8:1
looking at class device '/sys/block/sda/sda1':
SYSFS_dev="8:1"
SYSFS_start="32"
SYSFS_size="160"
SYSFS_stat=" 0 0 0 0"
follow the class device's "device"
looking at the device chain at '/sys/devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.3/1-1.3:1.0/host32/32:0:0:0':
BUS="scsi"
ID="32:0:0:0"
SYSFS_detach_state="0"
SYSFS_type="0"
SYSFS_model="USB 2 HS-CF"
SYSFS_vendor="SMSC "
SYSFS_max_sectors="240"
SYSFS_device_blocked="0"
SYSFS_queue_depth="1"
SYSFS_scsi_level="3"
SYSFS_rev="1.25"
SYSFS_online="1"
looking at the device chain at '/sys/devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.3/1-1.3:1.0/host32':
BUS=""
ID="host32"
SYSFS_detach_state="0"
looking at the device chain at '/sys/devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.3/1-1.3:1.0':
BUS="usb"
ID="1-1.3:1.0"
SYSFS_detach_state="0"
SYSFS_bInterfaceNumber="00"
SYSFS_bAlternateSetting=" 0"
SYSFS_bNumEndpoints="02"
SYSFS_bInterfaceClass="08"
SYSFS_bInterfaceSubClass="06"
SYSFS_bInterfaceProtocol="50"
SYSFS_iInterface="00"
looking at the device chain at '/sys/devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.3':
BUS="usb"
ID="1-1.3"
SYSFS_detach_state="0"
SYSFS_bNumConfigurations="1"
SYSFS_bNumInterfaces=" 1"
SYSFS_bConfigurationValue="1"
SYSFS_bmAttributes="80"
SYSFS_bMaxPower=" 96mA"
SYSFS_idVendor="0424"
SYSFS_idProduct="20fc"
SYSFS_bcdDevice="0125"
SYSFS_bDeviceClass="00"
SYSFS_bDeviceSubClass="00"
SYSFS_bDeviceProtocol="00"
SYSFS_speed="12"
SYSFS_manufacturer="SMSC"
SYSFS_product="USB 2 Flash Media Device"
SYSFS_serial="0305037000C2"
looking at the device chain at '/sys/devices/pci0000:00/0000:00:1d.0/usb1/1-1':
BUS="usb"
ID="1-1"
SYSFS_detach_state="0"
SYSFS_bNumConfigurations="1"
SYSFS_bNumInterfaces=" 1"
SYSFS_bConfigurationValue="1"
SYSFS_bmAttributes="e0"
SYSFS_bMaxPower=" 64mA"
SYSFS_idVendor="03eb"
SYSFS_idProduct="3301"
SYSFS_bcdDevice="0300"
SYSFS_bDeviceClass="09"
SYSFS_bDeviceSubClass="00"
SYSFS_bDeviceProtocol="00"
SYSFS_speed="12"
SYSFS_product="Standard USB Hub"
looking at the device chain at '/sys/devices/pci0000:00/0000:00:1d.0/usb1':
BUS="usb"
ID="usb1"
SYSFS_detach_state="0"
SYSFS_bNumConfigurations="1"
SYSFS_bNumInterfaces=" 1"
SYSFS_bConfigurationValue="1"
SYSFS_bmAttributes="40"
SYSFS_bMaxPower=" 0mA"
SYSFS_idVendor="0000"
SYSFS_idProduct="0000"
SYSFS_bcdDevice="0206"
SYSFS_bDeviceClass="09"
SYSFS_bDeviceSubClass="00"
SYSFS_bDeviceProtocol="00"
SYSFS_speed="12"
SYSFS_manufacturer="Linux 2.6.2-rc1-p4 uhci_hcd"
SYSFS_product="UHCI Host Controller"
SYSFS_serial="0000:00:1d.0"
looking at the device chain at '/sys/devices/pci0000:00/0000:00:1d.0':
BUS="pci"
ID="0000:00:1d.0"
SYSFS_detach_state="0"
SYSFS_vendor="0x8086"
SYSFS_device="0x2482"
SYSFS_subsystem_vendor="0x1014"
SYSFS_subsystem_device="0x0220"
SYSFS_class="0x0c0300"
SYSFS_irq="9"
looking at the device chain at '/sys/devices/pci0000:00':
BUS=""
ID="pci0000:00"
SYSFS_detach_state="0"
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On Sun, Jan 18, 2004 at 07:30:50AM +0100, Kay Sievers wrote:
> Hi,
> here is a small program to query all attributes of a device and
> print these in the udev key format. It may help to get the keys to
> define a rule.
Fixed a typo - the sysfs_device is right now.
USB FLash Reader:
kay@pim:~/src/udev.kay$ extras/udevinfo/udevinfo /sys/block/sda/sda1
device '/sys/block/sda/sda1' has major:minor 8:1
looking at class device '/sys/block/sda/sda1':
SYSFS_dev="8:1"
SYSFS_start="32"
SYSFS_size="160"
SYSFS_stat=" 0 0 0 0"
follow class device's "device" link '/sys/block/sda':
BUS="scsi"
ID="57:0:0:0"
SYSFS_detach_state="0"
SYSFS_type="0"
SYSFS_device_blocked="0"
SYSFS_queue_depth="1"
SYSFS_scsi_level="3"
SYSFS_vendor="SMSC "
SYSFS_model="USB 2 HS-CF"
SYSFS_rev="1.25"
SYSFS_online="1"
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