linux-kernel - Re: [PATCH 1/3] auxdisplay: Add 7 segment LED display driver

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Message-ID: <7ef941f5-fd2f-4893-81e1-94f5aabf6ac3@infradead.org>
Date: Sun, 25 Feb 2024 18:49:50 -0800
From: Randy Dunlap <rdunlap@...radead.org>
To: Chris Packham <chris.packham@...iedtelesis.co.nz>, ojeda@...nel.org,
 robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 andrew@...n.ch, gregory.clement@...tlin.com,
 sebastian.hesselbarth@...il.com, andy.shevchenko@...il.com,
 geert@...ux-m68k.org, pavel@....cz, lee@...nel.org
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-leds@...r.kernel.org
Subject: Re: [PATCH 1/3] auxdisplay: Add 7 segment LED display driver

Hi--

On 2/25/24 13:34, Chris Packham wrote:
> Add a driver for a 7 segment LED display. At the moment only one
> character is supported but it should be possible to expand this to
> support more characters and/or 14 segment displays in the future.
> 
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> ---
>  drivers/auxdisplay/Kconfig   |   7 ++
>  drivers/auxdisplay/Makefile  |   1 +
>  drivers/auxdisplay/seg-led.c | 152 +++++++++++++++++++++++++++++++++++
>  3 files changed, 160 insertions(+)
>  create mode 100644 drivers/auxdisplay/seg-led.c
> 
> diff --git a/drivers/auxdisplay/Kconfig b/drivers/auxdisplay/Kconfig
> index d944d5298eca..e826b5b15881 100644
> --- a/drivers/auxdisplay/Kconfig
> +++ b/drivers/auxdisplay/Kconfig
> @@ -197,6 +197,13 @@ config ARM_CHARLCD
>  	  line and the Linux version on the second line, but that's
>  	  still useful.
>  
> +config SEG_LED
> +	bool "Generic 7 segment LED display"
> +	select LINEDISP
> +	help
> +	  This driver supports a generic 7 segment LED display made up

	                                 7-segment

> +	  of GPIO pins connected to the individual segments.
> +
>  menuconfig PARPORT_PANEL
>  	tristate "Parallel port LCD/Keypad Panel support"
>  	depends on PARPORT
> diff --git a/drivers/auxdisplay/Makefile b/drivers/auxdisplay/Makefile
> index 6968ed4d3f0a..808fdf156bd5 100644
> --- a/drivers/auxdisplay/Makefile
> +++ b/drivers/auxdisplay/Makefile
> @@ -14,3 +14,4 @@ obj-$(CONFIG_HT16K33)		+= ht16k33.o
>  obj-$(CONFIG_PARPORT_PANEL)	+= panel.o
>  obj-$(CONFIG_LCD2S)		+= lcd2s.o
>  obj-$(CONFIG_LINEDISP)		+= line-display.o
> +obj-$(CONFIG_SEG_LED)		+= seg-led.o
> diff --git a/drivers/auxdisplay/seg-led.c b/drivers/auxdisplay/seg-led.c
> new file mode 100644
> index 000000000000..c0b302a09cbb
> --- /dev/null
> +++ b/drivers/auxdisplay/seg-led.c
> @@ -0,0 +1,152 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Driver for a 7 segment LED display
> + *
> + * The GPIOs are wired to the 7 segments in a clock wise fashion starting from
> + * the top.
> + *
> + *      -a-
> + *     |   |
> + *     f   b
> + *     |   |
> + *      -g-
> + *     |   |
> + *     e   c
> + *     |   |
> + *      -d-
> + *
> + * The decimal point LED presnet on some devices is currently not

                            present

> + * supported.
> + *
> + * Copyright (C) Allied Telesis Labs
> + */

-- 
#Randy