sysfs permitions on class leds

sysfs permitions on class leds

[Rodrigo Pereira]

(sorry my English)

I'm helping Márton Németh  in a experimental mail led driver
leds-clevo-mail.c for clevo laptops and I have problems with this
driver:
this files
/sys/class/<ledname>trigger,  /sys/class/<ledname>/dalay_on and
/sys/class/<ledname>/delay_off  are  created  as 644 permissions. Also
ROOT controls the led. I think write udev rules but my rules don't
change this permissions.

The clevo mail led is a trigger led (time-trigger) for blinks the led
when a new mail arrives.

How can I change the permissions of the sysfs objects in runtime or userspace?

the code of this driver is found at
http://sourceforge.net/projects/clevo-mailled/

Thank you.

Rodrigo Pereira

Re: sysfs permitions on class leds

[Greg KH]

On Fri, May 25, 2007 at 03:37:46PM -0300, Rodrigo Pereira wrote:
>  (sorry my English)
> 
>  I'm helping M?rton N?meth  in a experimental mail led driver
>  leds-clevo-mail.c for clevo laptops and I have problems with this
>  driver:
>  this files
>  /sys/class/<ledname>trigger,  /sys/class/<ledname>/dalay_on and
>  /sys/class/<ledname>/delay_off  are  created  as 644 permissions. Also
>  ROOT controls the led. I think write udev rules but my rules don't
>  change this permissions.
> 
>  The clevo mail led is a trigger led (time-trigger) for blinks the led
>  when a new mail arrives.
> 
>  How can I change the permissions of the sysfs objects in runtime or 
>  userspace?

Just do a 'chmod' on the sysfs file.  If you have the proper permissions
to do that, it will stick for as long as the sysfs file stays around.

hope this helps,

greg k-h