[lkml]   [2004]   [Sep]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 0/2] leds: new class for led devices

On Thu, Sep 02, 2004 at 08:33:10PM +0000, John Lenz wrote:
> This is an attempt to provide an alternative to the current arm
> specific led interface. This arm interface does not integrate well
> with the device model and sysfs.
I have written a GPIO device class driver for the same purpose; before
this goes into the kernel I think we should try to merge your attempts
with mine.

On embedded systems you normally have several things which are similar
to LEDs; embedded processors have quite a lot of general purpose I/O
pins. Normally you want some of the pins being used from userspace (like
'echo 1 > /sys/class/gpio/gpio5/level'), others are used from device
drivers. My framework offers a request_gpio() function similar to
request_gpio(), so the kernel can administrate these ressources.
I suppose it is not too difficult to unify our drivers in a way that the
base mechanism is more abstract then LEDs (a GPIO pin can also represent
a power switch or whatever) and still can support your LED levels.

I'll pull the gpio patch out of my working tree and post it here for

Dipl.-Ing. Robert Schwebel |
Pengutronix - Linux Solutions for Science and Industry
Handelsregister: Amtsgericht Hildesheim, HRA 2686
Hornemannstraße 12, 31137 Hildesheim, Germany
Phone: +49-5121-28619-0 | Fax: +49-5121-28619-4
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at
 \ /
  Last update: 2005-03-22 14:05    [from the cache]
©2003-2014 Jasper Spaans. hosted at Digital Ocean