Re: Linux support for a 7 segment LED display

[Lee Jones <lee@kernel.org>]

On Sun, 11 Feb 2024, Chris Packham wrote:

> Hi Blinkenlight enthusiasts,
> 
> I'm looking for something that I figured must exists but maybe it's so 
> niche that no-one has bothered to upstream a driver for it.
> 
> I have a requirement to support a 7-segment LED display[1] (one that can 
> display a single digit from 0-9). Hardware wise it's just a bunch of 
> individual GPIOs connected to each segment (plus an extra one for a 
> dot). I can't see anything obvious in drivers/leds but maybe I'm looking 
> in the wrong place. Or maybe it's the kind of thing on PC hardware that 
> is just driven by the BIOS without the operating system knowing about it.
> 
> Is there an existing in-kernel driver for such a thing?

Why would LEDs connected to a bunch of GPIOs in a specific fashion
require a hardware driver?  Doesn't drivers/leds/leds-gpio.c already
provide all the support you need?

-- 
Lee Jones [李琼斯]