Re: best way to handle LEDs

Ben Dooks
2005-11-02T02:48:29Z

On Wed, Nov 02, 2005 at 12:44:59AM +0100, Pavel Machek wrote:
> Hi!
>
> Handheld machines have limited number of software-controlled status
> LEDs. Collie, for example has two of them; one is labeled "charge" and
> second is labeled "mail".
>
> At least the "mail" led should be handled from userspace, and it would
> be nice if (at least) different speeds of blinking could be used --
> original Sharp ROM uses at least:
>
> yellow off: not charging
> yellow on: charging
> yellow fast blink: charge error
>
> I think even slow blinking was used somewhere. I have some code from
> John Lenz (attached); it uses sysfs interface, exports led collor, and
> allows setting different frequencies.
>
> Is that acceptable, or should some other interface be used?

there is already an LED interface for linux-arm, which is
used by a number of the extant machines in the sa11x0 and
pxa range.

--
Ben (ben@fluff.org, http://www.fluff.org/)

'a smiley only costs 4 bytes'