[pvrusb2] only few informations for udev available

[Martin Dauskardt]

I want to create an udev rule, but why does the pvrusb2 driver deliver so few 
informations? 

root at ubuntuvdr:~# udevadm info -a -p $(udevadm info -q path -n /dev/video0)

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/virtual/video4linux/video0':
    KERNEL=="video0"
    SUBSYSTEM=="video4linux"
    DRIVER==""
    ATTR{name}==""
    ATTR{index}=="0"


compared to an ivtv card:


root at ubuntuvdr:~# udevadm info -a -p $(udevadm info -q path -n /dev/video1)

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/pci0000:00/0000:00:08.0/video4linux/video1':
    KERNEL=="video1"
    SUBSYSTEM=="video4linux"
    DRIVER==""
    ATTR{name}=="ivtv0 encoder MPG"
    ATTR{index}=="0"

  looking at parent device '/devices/pci0000:00/0000:00:08.0':
    KERNELS=="0000:00:08.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="ivtv"
    ATTRS{vendor}=="0x4444"
    ATTRS{device}=="0x0803"
    ATTRS{subsystem_vendor}=="0x0070"
    ATTRS{subsystem_device}=="0x4000"
    ATTRS{class}=="0x040000"
    ATTRS{irq}=="16"
    ATTRS{local_cpus}=="ffffffff,ffffffff"
    ATTRS{local_cpulist}=="0-63"
    ATTRS{modalias}=="pci:v00004444d00000803sv00000070sd00004000bc04sc00i00"
    ATTRS{enable}=="1"
    ATTRS{broken_parity_status}=="0"
    ATTRS{msi_bus}==""

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