Re: How can I specify a specific 'sub-device' of a device for udev

[Jonathan Steinert <hachi@kuiki.net>]

Kay Sievers wrote:

>On Mon, 2004-03-01 at 17:23, Jonathan Steinert wrote:
>  
>
>>Kay Sievers wrote:
>>    
>>
>>>On Mon, 2004-03-01 at 07:08, Jonathan Steinert wrote:
>>>
>>>      
>>>
>> >This does leave me puzzled about two things:
>> >>
>> >> 1) Why does udev have a flag to crawl up the sysfs tree (Asuming my
>> >> observations of udev are correct) but no flag to show the attributes of
>> >> only the device I specify? or only 'n' layers down for that matter?
>> > Do you really need this? Why?
>>
>>That's not quite what I intended with the question. My observation is 
>>that udevinfo shows you all the attributes as you walk up the tree, but 
>>udev has no way to match attributes as you walk up the tree.
>>
>>I'm not sure if this is intended to confuse people, but it most 
>>certainly makes me think that there should be a way to match attributes 
>>as you walk up the tree with udev, otherwise why does it show it to you?
>>    
>>
>
>udevinfo prints all attributes in sections, you can select and combine
>any attribute within _one_ section, thats why we print it all.
>Unfortunally, I see this doesn't solve your problem.
>
>could you please send a:
>
>tree /sys/devices/pci0000:00/0000:00:1d.2/usb2/2-1
>
>I want to have a look if we can do something for you :)
>
>thanks,
>Kay
>
>  
>
Sure thing, here you go...

root@yuumi:/sys/devices/pci0000:00/0000:00:1d.2/usb2/2-1# tree .
.
|-- 2-1:1.0
|   |-- bAlternateSetting
|   |-- bInterfaceClass
|   |-- bInterfaceNumber
|   |-- bInterfaceProtocol
|   |-- bInterfaceSubClass
|   |-- bNumEndpoints
|   |-- detach_state
|   |-- iInterface
|   |-- power
|   |   `-- state
|   `-- ttyUSB0
|       |-- detach_state
|       `-- power
|           `-- state
|-- bConfigurationValue
|-- bDeviceClass
|-- bDeviceProtocol
|-- bDeviceSubClass
|-- bMaxPower
|-- bNumConfigurations
|-- bNumInterfaces
|-- bcdDevice
|-- bmAttributes
|-- detach_state
|-- idProduct
|-- idVendor
|-- manufacturer
|-- power
|   `-- state
|-- product
|-- serial
`-- speed

5 directories, 28 files

Thanks for taking the time to look, and help

--Jonathan Steinert


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