Re: [RFC] Updates to sysfs_create_subdir()

[Greg KH <greg@kroah.com>]

On Tue, Nov 29, 2005 at 01:41:01AM -0500, Kyle Moffett wrote:
> On Nov 29, 2005, at 00:44, Greg KH wrote:
> >On Mon, Nov 28, 2005 at 08:10:36PM -0500, Kyle Moffett wrote:
> >>If the kernel gets this, then udev needs to allow attributes with  
> >>more generic paths too.  It would be nice if I could use this  
> >>[Pulled from the sample udev output halfway down this page: http:// 
> >>www.reactivated.net/writing_udev_rules.html#identify-sysfs].
> >>
> >>BUS="scsi", SYSFS{../../../manufacturer}="Tekom Technologies,  
> >>Inc", NAME="my_camera"
> >
> >Why can't you do this today?  Have you tried it?
> 
> Hmm, no, I don't suppose I have.  I guess I was taking the udev docs  
> and other similar pages at their word that you couldn't match things  
> in multiple subdirs.  *tries*  Interesting; it appears to work, but  
> it would be nice if it was documented somewhere; this is _really_  
> handy for certain devices with partial or missing udev support.

Patches for documentation is always gladly accepted :)

> I do have one question, though.  Is there any way to access the  
> "DEVICE" or "SUBSYSTEM" values of those parent sysfs nodes?  I can  
> see that those are symlinks in sysfs to other sysfs dirs, so there's  
> no real way to match them with SYSFS{*},

As they are symlinks, you might just be able to follow them as part of
the path.  But odds are, something in libsysfs would prevent that from
working that way...

thanks,

greg k-h