From patchwork Sun Feb 25 21:34:21 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Packham X-Patchwork-Id: 776084 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 E0D791B960 for ; Sun, 25 Feb 2024 21:34:43 +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=1708896887; cv=none; b=PiQbYlxFYvefinlrZybeKRi+Pt8u3oiXoRNMeKqvVrBT4nkbcPuGC/LqkcrxmM/kBrfd88SbID/soVO1zJxmK1HOU8re9CcYPkrorNWzMJaiHviToYLKq5/QFdRlt8qs3wrvUVlwRXSMnKRPbXWopIEB7+I/PvIbB95neNvlxJE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708896887; c=relaxed/simple; bh=SdZOKZXPjiq5MBQHbcDJJWZtWB3WvC2tXqy38ykXjE4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DF3AVnBxFkF9Xxun2QxHT74zfhqkSSjmcqBY9EtV8wAjlcQ4C587SYauVetMCYD3lp51v5zXfveEsZkSIYFC4Ce0/PRpnM/Mjphou6hMGFIjJcTdxyOAE1QcA6yceLBL8bP/SFsZsie5+af+VKVh1d7KuG0vjsPj15JlPcm8bNA= 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=UdI/plJr; 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 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=alliedtelesis.co.nz header.i=@alliedtelesis.co.nz header.b="UdI/plJr" 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 F3AC52C07F0; Mon, 26 Feb 2024 10:34:35 +1300 (NZDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alliedtelesis.co.nz; s=mail181024; t=1708896875; bh=jbmr+ls+8vmNT0RepVMQNTeMhYsEBu7U/6wroDdbQ9s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UdI/plJrktm39vQGTA+E6G9Wvzhhv9+J9Wa3fo2OVexTPQNFgtmE0FLUefQO0w28e bLcWdo0pcrDgWknVV32mlrB0LvCg2oCO8ydpTfHpyIPfblmDVM8ooE01+AfYi/JFL8 GXxbGDEiXtfvAD3bPFD/SLGmhTFYUtAoy0cTBEuMiayDRkKF3+uHorHMwTf8bHlcKl 7fcvxaiHF3uJXc+oReQl2TAirYE7LNnBy0aD2Lf0h9xKiDmuCTqCOTndx4y6DHDb9i 5J5EHQovwLxiO4peujLCAk32LppVuHUuH8Wu7fIdp62khFmPXn7d2YCrLny+7txgdW Dfvzgr0maIQkw== 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 ; Mon, 26 Feb 2024 10:34:35 +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 9CB9613EE4F; Mon, 26 Feb 2024 10:34:35 +1300 (NZDT) Received: by chrisp-dl.ws.atlnz.lc (Postfix, from userid 1030) id 97F9D28031B; Mon, 26 Feb 2024 10:34:35 +1300 (NZDT) From: Chris Packham To: ojeda@kernel.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, andy.shevchenko@gmail.com, geert@linux-m68k.org, pavel@ucw.cz, lee@kernel.org Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-leds@vger.kernel.org, Chris Packham Subject: [PATCH 1/3] auxdisplay: Add 7 segment LED display driver Date: Mon, 26 Feb 2024 10:34:21 +1300 Message-ID: <20240225213423.690561-2-chris.packham@alliedtelesis.co.nz> X-Mailer: git-send-email 2.43.2 In-Reply-To: <20240225213423.690561-1-chris.packham@alliedtelesis.co.nz> References: <20240225213423.690561-1-chris.packham@alliedtelesis.co.nz> Precedence: bulk X-Mailing-List: linux-leds@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SEG-SpamProfiler-Analysis: v=2.4 cv=BKkQr0QG c=1 sm=1 tr=0 ts=65dbb26b 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 --- 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 + 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 + * supported. + * + * Copyright (C) Allied Telesis Labs + */ + +#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; + struct seg7_conversion_map seg7; + unsigned int map_size; + size_t num_char; + char curr[]; +}; + +static const SEG7_DEFAULT_MAP(initial_map_seg7); + +static ssize_t map_seg7_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct seg_led_priv *priv = dev_get_drvdata(dev); + + memcpy(buf, &priv->seg7, priv->map_size); + return priv->map_size; +} + +static ssize_t map_seg7_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t cnt) +{ + struct seg_led_priv *priv = dev_get_drvdata(dev); + + if (cnt != priv->map_size) + return -EINVAL; + + memcpy(&priv->seg7, buf, cnt); + return cnt; +} + +static DEVICE_ATTR_RW(map_seg7); + +static void seg_led_linedisp_update(struct linedisp *linedisp) +{ + struct seg_led_priv *priv = container_of(linedisp, struct seg_led_priv, linedisp); + + schedule_delayed_work(&priv->work, 0); +} + +static void seg_led_update(struct work_struct *work) +{ + struct seg_led_priv *priv = container_of(work, struct seg_led_priv, work.work); + DECLARE_BITMAP(values, 8); + + values[0] = map_to_seg7(&priv->seg7, priv->curr[0]); + + gpiod_set_array_value_cansleep(priv->segment_gpios->ndescs, priv->segment_gpios->desc, + priv->segment_gpios->info, values); +} + +static const struct of_device_id seg_led_of_match[] = { + { .compatible = "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; + int err; + + priv = devm_kzalloc(&pdev->dev, struct_size(priv, curr, 1), GFP_KERNEL); + if (!priv) + return -ENOMEM; + priv->num_char = 1; + + platform_set_drvdata(pdev, priv); + + priv->segment_gpios = devm_gpiod_get_array(&pdev->dev, "segment", GPIOD_OUT_LOW); + if (IS_ERR(priv->segment_gpios)) + return PTR_ERR(priv->segment_gpios); + + priv->seg7 = initial_map_seg7; + priv->map_size = sizeof(priv->seg7); + + err = device_create_file(&pdev->dev, &dev_attr_map_seg7); + if (err) + return err; + + INIT_DELAYED_WORK(&priv->work, seg_led_update); + + err = linedisp_register(&priv->linedisp, &pdev->dev, 1, priv->curr, + seg_led_linedisp_update); + if (err) { + device_remove_file(&pdev->dev, &dev_attr_map_seg7); + return err; + } + + return 0; +} + +static int seg_led_remove(struct platform_device *pdev) +{ + struct seg_led_priv *priv = platform_get_drvdata(pdev); + + cancel_delayed_work_sync(&priv->work); + linedisp_unregister(&priv->linedisp); + device_remove_file(&pdev->dev, &dev_attr_map_seg7); + + return 0; +} + +static struct platform_driver seg_led_driver = { + .probe = seg_led_probe, + .remove = seg_led_remove, + .driver = { + .name = "seg-led", + .of_match_table = seg_led_of_match, + }, +}; + +module_platform_driver(seg_led_driver); + +MODULE_AUTHOR("Chris Packham "); +MODULE_DESCRIPTION("7 segment LED driver"); +MODULE_LICENSE("GPL"); +