From patchwork Sat Sep 17 08:13:39 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jean-Jacques Hiblot X-Patchwork-Id: 607094 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AD459ECAAD3 for ; Sat, 17 Sep 2022 08:14:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229454AbiIQIOV (ORCPT ); Sat, 17 Sep 2022 04:14:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48710 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229669AbiIQIOS (ORCPT ); Sat, 17 Sep 2022 04:14:18 -0400 Received: from smtpout1.mo528.mail-out.ovh.net (smtpout1.mo528.mail-out.ovh.net [46.105.34.251]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8480A3F305; Sat, 17 Sep 2022 01:14:16 -0700 (PDT) Received: from pro2.mail.ovh.net (unknown [10.109.156.240]) by mo528.mail-out.ovh.net (Postfix) with ESMTPS id 91264128726FD; Sat, 17 Sep 2022 10:13:56 +0200 (CEST) Received: from localhost.localdomain (88.161.25.233) by DAG1EX1.emp2.local (172.16.2.1) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.12; Sat, 17 Sep 2022 10:13:55 +0200 From: Jean-Jacques Hiblot To: , , , CC: , , , , , , , , Jean-Jacques Hiblot Subject: [RESEND PATCH v3 4/4] leds: Add a multicolor LED driver to group monochromatic LEDs Date: Sat, 17 Sep 2022 10:13:39 +0200 Message-ID: <20220917081339.3354075-5-jjhiblot@traphandler.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220917081339.3354075-1-jjhiblot@traphandler.com> References: <20220917081339.3354075-1-jjhiblot@traphandler.com> MIME-Version: 1.0 X-Originating-IP: [88.161.25.233] X-ClientProxiedBy: DAG1EX2.emp2.local (172.16.2.2) To DAG1EX1.emp2.local (172.16.2.1) X-Ovh-Tracer-Id: 9350598727425931543 X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: 0 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvfedrfedvvddgtddvucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuqfggjfdpvefjgfevmfevgfenuceurghilhhouhhtmecuhedttdenucenucfjughrpefhvfevufffkffojghfggfgtghisehtkeertdertddtnecuhfhrohhmpeflvggrnhdqlfgrtghquhgvshcujfhisghlohhtuceojhhjhhhisghlohhtsehtrhgrphhhrghnughlvghrrdgtohhmqeenucggtffrrghtthgvrhhnpeduteevleevvefggfdvueffffejhfehheeuiedtgedtjeeghfehueduudegfeefueenucfkpheptddrtddrtddrtddpkeekrdduiedurddvhedrvdeffeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhhouggvpehsmhhtphhouhhtpdhhvghlohepphhrohdvrdhmrghilhdrohhvhhdrnhgvthdpihhnvghtpedtrddtrddtrddtpdhmrghilhhfrhhomhepjhhjhhhisghlohhtsehtrhgrphhhrghnughlvghrrdgtohhmpdhnsggprhgtphhtthhopedupdhrtghpthhtohepshhhrgesphgvnhhguhhtrhhonhhigidruggvpdfovfetjfhoshhtpehmohehvdek Precedence: bulk List-ID: X-Mailing-List: linux-leds@vger.kernel.org By allowing to group multiple monochrome LED into multicolor LEDs, all involved LEDs can be controlled in-sync. This enables using effects using triggers, etc. Signed-off-by: Jean-Jacques Hiblot --- drivers/leds/rgb/Kconfig | 6 + drivers/leds/rgb/Makefile | 1 + drivers/leds/rgb/leds-group-multicolor.c | 153 +++++++++++++++++++++++ 3 files changed, 160 insertions(+) create mode 100644 drivers/leds/rgb/leds-group-multicolor.c diff --git a/drivers/leds/rgb/Kconfig b/drivers/leds/rgb/Kconfig index 204cf470beae..c2610c47a82d 100644 --- a/drivers/leds/rgb/Kconfig +++ b/drivers/leds/rgb/Kconfig @@ -2,6 +2,12 @@ if LEDS_CLASS_MULTICOLOR +config LEDS_GRP_MULTICOLOR + tristate "Multi-color LED grouping support" + help + This option enables support for monochrome LEDs that are + grouped into multicolor LEDs. + config LEDS_PWM_MULTICOLOR tristate "PWM driven multi-color LED Support" depends on PWM diff --git a/drivers/leds/rgb/Makefile b/drivers/leds/rgb/Makefile index 0675bc0f6e18..4de087ad79bc 100644 --- a/drivers/leds/rgb/Makefile +++ b/drivers/leds/rgb/Makefile @@ -1,4 +1,5 @@ # SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_LEDS_GRP_MULTICOLOR) += leds-group-multicolor.o obj-$(CONFIG_LEDS_PWM_MULTICOLOR) += leds-pwm-multicolor.o obj-$(CONFIG_LEDS_QCOM_LPG) += leds-qcom-lpg.o diff --git a/drivers/leds/rgb/leds-group-multicolor.c b/drivers/leds/rgb/leds-group-multicolor.c new file mode 100644 index 000000000000..61f9e1954fc4 --- /dev/null +++ b/drivers/leds/rgb/leds-group-multicolor.c @@ -0,0 +1,153 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * multi-color LED built with monochromatic LED devices + * + * Copyright 2022 Jean-Jacques Hiblot + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +struct led_mcg_priv { + struct led_classdev_mc mc_cdev; + struct led_classdev **monochromatics; +}; + +static int led_mcg_set(struct led_classdev *cdev, + enum led_brightness brightness) +{ + struct led_classdev_mc *mc_cdev = lcdev_to_mccdev(cdev); + struct led_mcg_priv *priv = + container_of(mc_cdev, struct led_mcg_priv, mc_cdev); + int i; + + led_mc_calc_color_components(mc_cdev, brightness); + + for (i = 0; i < mc_cdev->num_colors; i++) { + struct led_classdev *mono = priv->monochromatics[i]; + int actual_led_brightness; + + /* + * Scale the intensity according the max brightness of the + * monochromatic LED + */ + actual_led_brightness = DIV_ROUND_CLOSEST( + mono->max_brightness * mc_cdev->subled_info[i].brightness, + mc_cdev->led_cdev.max_brightness); + + led_set_brightness(mono, actual_led_brightness); + } + + return 0; +} + +static int led_mcg_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct led_init_data init_data = {}; + struct led_classdev *cdev; + struct mc_subled *subled; + struct led_mcg_priv *priv; + int i, count, ret; + unsigned int max_brightness; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + count = 0; + max_brightness = 0; + for (;;) { + struct led_classdev *led_cdev; + + led_cdev = devm_of_led_get(dev, count); + if (IS_ERR(led_cdev)) { + /* Reached the end of the list ? */ + if (PTR_ERR(led_cdev) == -ENOENT) + break; + return dev_err_probe(dev, PTR_ERR(led_cdev), + "Unable to get led #%d", count); + } + count++; + + priv->monochromatics = devm_krealloc(dev, priv->monochromatics, + count * sizeof(*priv->monochromatics), + GFP_KERNEL); + if (!priv->monochromatics) + return -ENOMEM; + + priv->monochromatics[count - 1] = led_cdev; + + max_brightness = max(max_brightness, led_cdev->max_brightness); + } + + subled = devm_kzalloc(dev, count * sizeof(*subled), GFP_KERNEL); + if (!subled) + return -ENOMEM; + priv->mc_cdev.subled_info = subled; + + for (i = 0; i < count; i++) { + struct led_classdev *led_cdev = priv->monochromatics[i]; + + subled[i].color_index = led_cdev->color; + /* configure the LED intensity to its maximum */ + subled[i].intensity = max_brightness; + } + + /* init the multicolor's LED class device */ + cdev = &priv->mc_cdev.led_cdev; + cdev->flags = LED_CORE_SUSPENDRESUME; + cdev->brightness_set_blocking = led_mcg_set; + cdev->max_brightness = max_brightness; + cdev->color = LED_COLOR_ID_MULTI; + priv->mc_cdev.num_colors = count; + + init_data.fwnode = dev_fwnode(dev); + ret = devm_led_classdev_multicolor_register_ext(dev, &priv->mc_cdev, + &init_data); + if (ret) + return dev_err_probe(dev, ret, + "failed to register multicolor led for %s.\n", + cdev->name); + + ret = led_mcg_set(cdev, cdev->brightness); + if (ret) + return dev_err_probe(dev, ret, + "failed to set led value for %s.", + cdev->name); + + for (i = 0; i < count; i++) { + struct led_classdev *led_cdev = priv->monochromatics[i]; + + /* Make the sysfs of the monochromatic LED read-only */ + led_cdev->flags |= LED_SYSFS_DISABLE; + } + + return 0; +} + +static const struct of_device_id of_led_mcg_match[] = { + { .compatible = "leds-group-multicolor" }, + {} +}; +MODULE_DEVICE_TABLE(of, of_led_mcg_match); + +static struct platform_driver led_mcg_driver = { + .probe = led_mcg_probe, + .driver = { + .name = "leds_group_multicolor", + .of_match_table = of_led_mcg_match, + } +}; +module_platform_driver(led_mcg_driver); + +MODULE_AUTHOR("Jean-Jacques Hiblot "); +MODULE_DESCRIPTION("multi-color LED group driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:leds-group-multicolor");