[SOLVED] Change sysfs-permissions through udev-rules (tp_smapi)

[tuxor]

Happy new year!

On my ThinkPad T400s (Fedora x86_64), I'm using the module tp_smapi (more info: http://www.thinkwiki.org/wiki/Tp_smapi) to modify certain parameters that can't be accessed through /proc/acpi/battery - for example: /sys/devices/platform/smapi/BAT0/start_charge_thresh.

Now these sysfs-device-parameters can't be changed by non-root-users. But I want users of the group wheel to be allowed to directly modify values in /sys/devices/platform/smapi/BAT0/ (those files are usually owned by root:root and have mode 644).

I tried creating a udev-rules-file /etc/udev/rules.d/30-smapi.rules:

DRIVER=="smapi", GROUP="wheel", MODE="664"

Unfortunately, this doesn't have any effect at all. So what's wrong with this rule?

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More info about the smapi-sysfs-device:

$ udevadm info -a -p /sys/devices/platform/smapi/
  looking at device '/devices/platform/smapi':
    KERNEL=="smapi"
    SUBSYSTEM=="platform"
    DRIVER=="smapi"
    ATTR{ac_connected}=="0"

---------- Post added at 05:41 PM ---------- Previous post was at 12:24 PM ----------

What worked out well is the following udev-rule.

DRIVER=="smapi", RUN+="/bin/find /sys/devices/platform/smapi/ -name *_charge_thresh -execdir /bin/chmod 664 {} ; -execdir /bin/chown root:wheel {} ;"

It's not exactly elegant, but it suffices and thus I'm gonna mark this thread as solved.