linux-kernel - Re: Building BarGraph with LED subsystem

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Message-ID: <8107d8a0e50b64dd45dc749da87b2c7b.squirrel@mungewell.org>
Date:	Fri, 16 Mar 2012 12:26:56 -0400
From:	simon@...gewell.org
To:	"John Stoffel" <john@...ffel.org>
Cc:	simon@...gewell.org, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Building BarGraph with LED subsystem


> simon> Also I have a question about the default permissions on the LED
> simon> controls; Is it possible to register LEDs so that users have
> simon> write permission? At present the controls are only accessible
> simon> as root.
>
> udev is the answer here.  You probably want to make it so that the
> LEDs are open to the user logged into the system console or currently
> active Xsession.
>
> John
>

So what would be the best way to achieve this (once the code gets into
kernel)? I mean so that 'Jane Doe' get the LEDs working when she plugs in
her wheel...

At present the patch uses the devices ID's to register the LED's. ie.
--
Mar 14 14:57:35 ubuntu kernel: [ 6462.204185] Registered led device:
0003:046D:C294.0009::RPM1
Mar 14 14:57:35 ubuntu kernel: [ 6462.204251] Registered led device:
0003:046D:C294.0009::RPM2
Mar 14 14:57:35 ubuntu kernel: [ 6462.204301] Registered led device:
0003:046D:C294.0009::RPM3
Mar 14 14:57:35 ubuntu kernel: [ 6462.204354] Registered led device:
0003:046D:C294.0009::RPM4
Mar 14 14:57:35 ubuntu kernel: [ 6462.204402] Registered led device:
0003:046D:C294.0009::RPM5
--

Simon.


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