On Mon, 19 Feb 2024, Chris Packham wrote: > Hi Lee, > > On 20/02/24 04:13, Lee Jones wrote: > > 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? > Yes I could expose the individual segments as gpio-ledsbut it would be > nicer if they worked in a more co-ordinated fashion so I didn't have to > care about the individual segments and could just say "display 7" or > "display 0". Still not sure this sort of thing should be kernel-side. Sounds more like the role of a library or middle-layer. -- Lee Jones [李琼斯]
