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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 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 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1792090181798808987 X-GMAIL-MSGID: 1792090181798808987 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 = "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. +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-$(CONFIG_PARPORT_PANEL) += panel.o obj-$(CONFIG_LCD2S) += lcd2s.o obj-$(CONFIG_LINEDISP) += line-display.o obj-$(CONFIG_MAX6959) += max6959.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..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 = container_of(work, struct seg_led_priv, work.work); + struct linedisp_map *map = priv->linedisp.map; + DECLARE_BITMAP(values, 8); + + values[0] = map_to_seg7(&map->map.seg7, priv->linedisp.buf[0]); + + gpiod_set_array_value_cansleep(priv->segment_gpios->ndescs, priv->segment_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 = container_of(linedisp, struct seg_led_priv, linedisp); + + schedule_delayed_work(&priv->work, 0); +} + +static const struct linedisp_ops seg_led_linedisp_ops = { + .get_map_type = seg_led_linedisp_get_map_type, + .update = seg_led_linedisp_update, +}; + +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; + struct device *dev = &pdev->dev; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + platform_set_drvdata(pdev, priv); + + priv->segment_gpios = 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 = platform_get_drvdata(pdev); + + cancel_delayed_work_sync(&priv->work); + linedisp_unregister(&priv->linedisp); + + 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");