Re: general hotplug/udev questions

[Kay Sievers <kay.sievers@vrfy.org>]

On Fri, Aug 19, 2005 at 10:33:02PM +0600, Alexander E. Patrakov wrote:
> Greg KH wrote:
> 
> >On Fri, Aug 19, 2005 at 03:09:59PM +0600, Alexander E. Patrakov wrote:
> > 
> >
> >>Do I understand correctly that the "crawl through sysfs" approach means 
> >>bus-specific conversion between sysfs contents (e.g the fact that 
> >>/sys/bus/usb/devices/1-1/idProduct contains "4002" here) and environment 
> >>variables (in this case, PRODUCT=...)?
> >>   
> >>
> >
> >Yes, but it's a world easier now that we have added the 'modalias' sysfs
> >files so we don't have to reconstruct anything.  All we care about at
> >coldplug time is loading the modules and creating existing device nodes.
> > 
> >
> Sorry, no. We should also care about providing some hook for packages 
> like SANE and gPhoto2 to chown/chmod pseudofiles in /proc/bus/usb. This 
> requires perfect reconstruction of at least $PRODUCT and $DEVICE.

usbfs can go to nowhere. :)
We will get real nodes for libusb access managed by udev with kernel 2.6.14:

  kay@pim:~> tree /sys/class/usb_device/
  /sys/class/usb_device/
  |-- usbdev1.1
  |   |-- dev
  |   `-- device -> ../../../devices/pci0000:00/0000:00:1d.0/usb1
  |-- usbdev1.2
  |   |-- dev
  |   `-- device -> ../../../devices/pci0000:00/0000:00:1d.0/usb1/1-1
  |-- usbdev2.1
  |   |-- dev
  |   `-- device -> ../../../devices/pci0000:00/0000:00:1d.1/usb2
  |-- usbdev2.2
  |    |-- dev
  |   `-- device -> ../../../devices/pci0000:00/0000:00:1d.1/usb2/2-2
  | -- usbdev3.1
  |   |-- dev
  |   `-- device -> ../../../devices/pci0000:00/0000:00:1d.2/usb3
  |-- usbdev4.1
  |   |-- dev
  |   `-- device -> ../../../devices/pci0000:00/0000:00:1d.7/usb4
  `-- usbdev4.5
      |-- dev
      `-- device -> ../../../devices/pci0000:00/0000:00:1d.7/usb4/4-3

Kay


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