Received: by 2002:a05:7208:9594:b0:7e:5202:c8b4 with SMTP id gs20csp2189356rbb; Tue, 27 Feb 2024 13:40:26 -0800 (PST) X-Forwarded-Encrypted: i=3; AJvYcCU9Af3jjobwldysM0hHTXSqgZAph9OHyg3prLnPYq2Qt4DVFnXwRHEUf7rpy+O5AOk7hEjz6btG3LERMKu8XMfsszZKcQnapVZAQLAoQQ== X-Google-Smtp-Source: AGHT+IFOWVhn4Fdl3wvGo5oDsYv9S+uIQwffO6GZV+u4TJ5PT9HirA0BoCUuf1BlNbqgJevQ9bgP X-Received: by 2002:a05:6a20:762a:b0:1a0:d25b:aaac with SMTP id m42-20020a056a20762a00b001a0d25baaacmr2303065pze.32.1709070025936; Tue, 27 Feb 2024 13:40:25 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1709070025; cv=pass; d=google.com; s=arc-20160816; b=tJ8Df/eL4grDIZpsBPWb6ZrltHkL1guzl4XvcYV3wEwTNUo8HRpIE14cD+qdK8hizQ AvHQXggNjXXoYqI9MyT7wrWMWpTdLMk7RPjrhnzuRgF+QtypQIu4QHWli12bkWyVemHo ftIyp9ZFTifI4otX/jVBtX+0ueffRd3U2FDZTZkgK49+bi0tDWcHjpaLVihj2eQ7ZZXD 4JdL08pYdA2FwZLGUyV+CT1OfXnoRUvZJ+Pdo+dE6WjcP0SVeG54o5nlhXXxlKZFTerU Yru1shbPiGDTYeLKeVSdiLtDDt+Mzd0gkosylVOa6wzpg91UutNtjFNpnH93unDUT2hh hGQw== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:list-unsubscribe :list-subscribe:list-id:precedence:references:in-reply-to:message-id :date:subject:cc:to:from:dkim-signature; bh=bmOeu545IlDEfWmGK3n3UhjYbFI/JyDlqa6BrnpO7w0=; fh=0E1zKu25rC1dvhxh54JUfQllyJcUtqgw4XThBRPfUNc=; b=UMRmgwvLsX2btwkUEC7kixjACXnCkmdiF7zTDru/eq4/tNWQmQwmEv8n+6wi+WxE9f F0FMARNuncJNnUciJ2tzJcT4uF7VJ9xg9YEhJEPUcAej9IwxUNOrdsNw1NNb/xsiiTTX Sl7T5pXBrblZb2a8iRmdUq3hXfSoHhFXCw9xiOjRujkk4FWqOTZcLG1Du8gwshkBXUmJ tu51hNnwmKBlI3QZ6OhQBCLRSglGA412pQyaUnyWW9s1PfpA6Sd+tMbcl9i+v8+poSEi X8FZqc0yRPs4G564hxp/dzS2QVY3S0eDe/76gfOi5biWkTRx8/xGPHY/LR1EBjOKPXuV 22ow==; dara=google.com ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@alliedtelesis.co.nz header.s=mail181024 header.b=kXBsLGER; arc=pass (i=1 spf=pass spfdomain=alliedtelesis.co.nz dkim=pass dkdomain=alliedtelesis.co.nz dmarc=pass fromdomain=alliedtelesis.co.nz); spf=pass (google.com: domain of linux-kernel+bounces-84025-linux.lists.archive=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) smtp.mailfrom="linux-kernel+bounces-84025-linux.lists.archive=gmail.com@vger.kernel.org"; dmarc=pass (p=QUARANTINE sp=REJECT dis=NONE) header.from=alliedtelesis.co.nz Return-Path: Received: from sv.mirrors.kernel.org (sv.mirrors.kernel.org. [139.178.88.99]) by mx.google.com with ESMTPS id t15-20020a63460f000000b005e47ac43dd5si2652012pga.101.2024.02.27.13.40.25 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Feb 2024 13:40:25 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel+bounces-84025-linux.lists.archive=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) client-ip=139.178.88.99; Authentication-Results: mx.google.com; dkim=pass header.i=@alliedtelesis.co.nz header.s=mail181024 header.b=kXBsLGER; arc=pass (i=1 spf=pass spfdomain=alliedtelesis.co.nz dkim=pass dkdomain=alliedtelesis.co.nz dmarc=pass fromdomain=alliedtelesis.co.nz); spf=pass (google.com: domain of linux-kernel+bounces-84025-linux.lists.archive=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) smtp.mailfrom="linux-kernel+bounces-84025-linux.lists.archive=gmail.com@vger.kernel.org"; dmarc=pass (p=QUARANTINE sp=REJECT dis=NONE) header.from=alliedtelesis.co.nz Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sv.mirrors.kernel.org (Postfix) with ESMTPS id 73C7D28E50D for ; Tue, 27 Feb 2024 21:23:12 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 01AFF14F9FC; Tue, 27 Feb 2024 21:22:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=alliedtelesis.co.nz header.i=@alliedtelesis.co.nz header.b="kXBsLGER" Received: from gate2.alliedtelesis.co.nz (gate2.alliedtelesis.co.nz [202.36.163.20]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 054E614F961 for ; Tue, 27 Feb 2024 21:22:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=202.36.163.20 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709068971; cv=none; b=fwJihAueycZjAFma38+JKmuVIXsxzhsD459vuRbWEqTsIsdZQjHIeuSzH4ttQZEZUXuFIpi0HcVHKKaALvaYLy6TyEeW3Q29Ydr0X+jeivFnYkBELITqXd6zef8sI5NCHRxT6QkXTVLsBWm8YwRBsOimgxaU7QP9h1gkr/ESNR8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709068971; c=relaxed/simple; bh=qzfiETCWDTDKCh2kO3rgSBlBWXrnzAF7pzLqrMmcF4Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Gb6qkZqLiuUY50UfVhj52iQUgagwZGFFXgnsUQl1OhBG5Fiu8bjLnUdiXRb7CB4BNghx8E8a/YJ01Eybm/KIH0U0NJQR+FybFU8oQUlpQ6HryN+shs1zHyUBihj47hzrAEDIghDPV8Tux//UkK2QHS36J0TaRgYlp2b2ZAaZCHw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=alliedtelesis.co.nz; spf=pass smtp.mailfrom=alliedtelesis.co.nz; dkim=pass (2048-bit key) header.d=alliedtelesis.co.nz header.i=@alliedtelesis.co.nz header.b=kXBsLGER; arc=none smtp.client-ip=202.36.163.20 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=alliedtelesis.co.nz Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=alliedtelesis.co.nz Received: from svr-chch-seg1.atlnz.lc (mmarshal3.atlnz.lc [10.32.18.43]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by gate2.alliedtelesis.co.nz (Postfix) with ESMTPS id B306C2C02AB; Wed, 28 Feb 2024 10:22:46 +1300 (NZDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alliedtelesis.co.nz; s=mail181024; t=1709068966; bh=bmOeu545IlDEfWmGK3n3UhjYbFI/JyDlqa6BrnpO7w0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kXBsLGERG+uysYrZysHfrOnXr3yfKbmmDdtJrEmLtPiR8o0mU7p/xZ1fJdAgGKesP JuxhaERwRugwzv+rXQCHBil1/LmhghvPo8vbXox2RsWfpeiVQBKoCYjLFTvksQT7ef tUKnMEHmgwk7yS4ZWrYmH79iog3RJ5QE1A11S64oLa7a4Jq0BPuknnwwxC36y1FMAb bksStlvnFCYlzIKL4d5YOxsLDsNHLpOFkAcfezY/FzHtZUClzWYLKiL42Bt+uhSHaX oGtd7Cu6JnX2pozxMiUQfZYVediiFVtmlP5PWgw5RX6U145jO2bPPEVHuXbzuZstMm zzlrEB+OPO9Xg== Received: from pat.atlnz.lc (Not Verified[10.32.16.33]) by svr-chch-seg1.atlnz.lc with Trustwave SEG (v8,2,6,11305) id ; Wed, 28 Feb 2024 10:22:46 +1300 Received: from chrisp-dl.ws.atlnz.lc (chrisp-dl.ws.atlnz.lc [10.33.22.30]) by pat.atlnz.lc (Postfix) with ESMTP id 619CE13EE4F; Wed, 28 Feb 2024 10:22:46 +1300 (NZDT) Received: by chrisp-dl.ws.atlnz.lc (Postfix, from userid 1030) id 5C74F280788; Wed, 28 Feb 2024 10:22:46 +1300 (NZDT) From: Chris Packham To: andy@kernel.org, geert@linux-m68k.org, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, andrew@lunn.ch, gregory.clement@bootlin.com, sebastian.hesselbarth@gmail.com, ojeda@kernel.org, tzimmermann@suse.de, javierm@redhat.com, robin@protonic.nl, lee@kernel.org, pavel@ucw.cz Cc: devicetree@vger.kernel.org, linux-leds@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Chris Packham Subject: [PATCH v2 1/4] auxdisplay: Add 7 segment LED display driver Date: Wed, 28 Feb 2024 10:22:41 +1300 Message-ID: <20240227212244.262710-2-chris.packham@alliedtelesis.co.nz> X-Mailer: git-send-email 2.43.2 In-Reply-To: <20240227212244.262710-1-chris.packham@alliedtelesis.co.nz> References: <20240227212244.262710-1-chris.packham@alliedtelesis.co.nz> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-SEG-SpamProfiler-Analysis: v=2.4 cv=BKkQr0QG c=1 sm=1 tr=0 ts=65de52a6 a=KLBiSEs5mFS1a/PbTCJxuA==:117 a=k7vzHIieQBIA:10 a=F0jKMMnsshfnaHI64i4A:9 a=3ZKOabzyN94A:10 X-SEG-SpamProfiler-Score: 0 x-atlnz-ls: pat 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 --- Notes: Changes in v2: - Rebased on top of auxdisplay/for-next dropping unnecessary code for= 7 segment maps. - Update for new linedisp_register() API - Include headers based on actual usage - Allow building as module - Use compatible =3D "generic-gpio-7seg" to keep checkpatch.pl happy drivers/auxdisplay/Kconfig | 10 +++ drivers/auxdisplay/Makefile | 1 + drivers/auxdisplay/seg-led.c | 119 +++++++++++++++++++++++++++++++++++ 3 files changed, 130 insertions(+) create mode 100644 drivers/auxdisplay/seg-led.c diff --git a/drivers/auxdisplay/Kconfig b/drivers/auxdisplay/Kconfig index d4be0a3695ce..52a245ca0c8d 100644 --- a/drivers/auxdisplay/Kconfig +++ b/drivers/auxdisplay/Kconfig @@ -211,6 +211,16 @@ config ARM_CHARLCD line and the Linux version on the second line, but that's still useful. =20 +config SEG_LED + tristate "Generic 7 segment LED display" + select LINEDISP + help + This driver supports a generic 7 segment LED display made up + of GPIO pins connected to the individual segments. + + This driver can also be built as a module. If so, the module + will be called seg-led. + menuconfig PARPORT_PANEL tristate "Parallel port LCD/Keypad Panel support" depends on PARPORT diff --git a/drivers/auxdisplay/Makefile b/drivers/auxdisplay/Makefile index a725010ca651..744e354318ae 100644 --- a/drivers/auxdisplay/Makefile +++ b/drivers/auxdisplay/Makefile @@ -15,3 +15,4 @@ obj-$(CONFIG_PARPORT_PANEL) +=3D panel.o obj-$(CONFIG_LCD2S) +=3D lcd2s.o obj-$(CONFIG_LINEDISP) +=3D line-display.o obj-$(CONFIG_MAX6959) +=3D max6959.o +obj-$(CONFIG_SEG_LED) +=3D seg-led.o diff --git a/drivers/auxdisplay/seg-led.c b/drivers/auxdisplay/seg-led.c new file mode 100644 index 000000000000..7bb304fcaa6e --- /dev/null +++ b/drivers/auxdisplay/seg-led.c @@ -0,0 +1,119 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for a 7 segment LED display + * + * The GPIOs are wired to the 7 segments in a clockwise fashion starting= from + * the top. + * + * -a- + * | | + * f b + * | | + * -g- + * | | + * e c + * | | + * -d- + * + * The decimal point LED present on some devices is currently not + * supported. + * + * Copyright (C) Allied Telesis Labs + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "line-display.h" + +struct seg_led_priv { + struct gpio_descs *segment_gpios; + struct delayed_work work; + struct linedisp linedisp; +}; + +static void seg_led_update(struct work_struct *work) +{ + struct seg_led_priv *priv =3D container_of(work, struct seg_led_priv, w= ork.work); + struct linedisp_map *map =3D priv->linedisp.map; + DECLARE_BITMAP(values, 8); + + values[0] =3D map_to_seg7(&map->map.seg7, priv->linedisp.buf[0]); + + gpiod_set_array_value_cansleep(priv->segment_gpios->ndescs, priv->segme= nt_gpios->desc, + priv->segment_gpios->info, values); +} + +static int seg_led_linedisp_get_map_type(struct linedisp *linedisp) +{ + return LINEDISP_MAP_SEG7; +} + +static void seg_led_linedisp_update(struct linedisp *linedisp) +{ + struct seg_led_priv *priv =3D container_of(linedisp, struct seg_led_pri= v, linedisp); + + schedule_delayed_work(&priv->work, 0); +} + +static const struct linedisp_ops seg_led_linedisp_ops =3D { + .get_map_type =3D seg_led_linedisp_get_map_type, + .update =3D seg_led_linedisp_update, +}; + +static const struct of_device_id seg_led_of_match[] =3D { + { .compatible =3D "generic-gpio-7seg"}, + {} +}; +MODULE_DEVICE_TABLE(of, seg_led_of_match); + +static int seg_led_probe(struct platform_device *pdev) +{ + struct seg_led_priv *priv; + struct device *dev =3D &pdev->dev; + + priv =3D devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + platform_set_drvdata(pdev, priv); + + priv->segment_gpios =3D devm_gpiod_get_array(dev, "segment", GPIOD_OUT_= LOW); + if (IS_ERR(priv->segment_gpios)) + return PTR_ERR(priv->segment_gpios); + + INIT_DELAYED_WORK(&priv->work, seg_led_update); + + return linedisp_register(&priv->linedisp, dev, 1, &seg_led_linedisp_ops= ); +} + +static int seg_led_remove(struct platform_device *pdev) +{ + struct seg_led_priv *priv =3D platform_get_drvdata(pdev); + + cancel_delayed_work_sync(&priv->work); + linedisp_unregister(&priv->linedisp); + + return 0; +} + +static struct platform_driver seg_led_driver =3D { + .probe =3D seg_led_probe, + .remove =3D seg_led_remove, + .driver =3D { + .name =3D "seg-led", + .of_match_table =3D seg_led_of_match, + }, +}; +module_platform_driver(seg_led_driver); + +MODULE_AUTHOR("Chris Packham "); +MODULE_DESCRIPTION("7 segment LED driver"); +MODULE_LICENSE("GPL"); --=20 2.43.2