[argyllcms] Re: SOLVED newbie problems with make, usb

Op dinsdag 26 juni 2007, schreef Milan Knizek:

  > On Tuesday 26 June 2007, Graeme Gill wrote:
  > > Really weird. There are many examples of udev configs that use
  > > BUS=="usb" out there, so why this should have a negative effect
  > > is a puzzle. Perhaps this has been removed from udev, and
  > > now one uses SUBSYSTEM=="usb_device" ?
[...]
  > Hence it seems quite difficult to propose a universal advice valid
  > for all systems apart from
  > 1) check dmesg after plug-in to find out which usb device was
  > assigned (e.g. usb 2-1)
  > 2) check udevinfo -a -p /sys/bus/usb/devices/2-1
  > 3) use those keys in your rules.
I think you're right. Following this on my system gives for usb 4-1

caspar@casco:~> udevinfo -a -p /sys/bus/usb/devices/4-1
[...]
  looking at device '/devices/pci0000:00/0000:00:1d.2/usb4/4-1':
    KERNEL=="4-1"
    SUBSYSTEM=="usb"
    DRIVER=="usb"
    ATTR{configuration}==""
    ATTR{serial}=="027805"
    ATTR{product}=="X-Rite DTP94"
    ATTR{manufacturer}=="X-Rite"
    ATTR{maxchild}=="0"
    ATTR{version}==" 2.00"
    ATTR{devnum}=="11"
    ATTR{speed}=="1.5"
    ATTR{bMaxPacketSize0}=="8"
    ATTR{bNumConfigurations}=="1"
    ATTR{bDeviceProtocol}=="ff"
    ATTR{bDeviceSubClass}=="ff"
    ATTR{bDeviceClass}=="ff"
    ATTR{bcdDevice}=="0000"
    ATTR{idProduct}=="d094"
    ATTR{idVendor}=="0765"
    ATTR{bMaxPower}==" 20mA"
    ATTR{bmAttributes}=="80"
    ATTR{bConfigurationValue}=="1"
    ATTR{bNumInterfaces}==" 1"
[...]
  
Adding SUBSYSTEM=="usb", as these results would suggest, as a third 
matching criterion to  ATTR{idProduct}=="d094" and 
ATTR{idVendor}=="0765", doesn't give the expected result.
SUBSYSTEM=="usb_device" does, as well as SUBSYSTEMS=="usb".
I can't explain this. But on the other hand I don't think adding this 
extra criterion is necessary. The chance that an attached device has 
the same vendor and product id is very slim.
By the way, SYSFS still works, but to be consistent with the above 
information I now use ATTR.

Caspar.
-- 
Major accidents are rare events due to many barriers, safeguards, and 
defences developed by modern technologies. But they continue to happen 
with saddening regularity, and their human and financial consequences 
are all too often catastrophic. --J. Reason, Managing the Risks of 
Organisational Accidents (1998).

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