From patchwork Mon Jan 2 08:10:19 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jean-Jacques Hiblot X-Patchwork-Id: 639168 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 908CCC4167B for ; Mon, 2 Jan 2023 08:20:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229951AbjABIUq (ORCPT ); Mon, 2 Jan 2023 03:20:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43514 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231550AbjABIUh (ORCPT ); Mon, 2 Jan 2023 03:20:37 -0500 Received: from smtpout1.mo3004.mail-out.ovh.net (smtpout1.mo3004.mail-out.ovh.net [79.137.123.219]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E47952603; Mon, 2 Jan 2023 00:20:34 -0800 (PST) Received: from pro2.mail.ovh.net (unknown [10.109.143.204]) by mo3004.mail-out.ovh.net (Postfix) with ESMTPS id 7A46623D983; Mon, 2 Jan 2023 08:10:35 +0000 (UTC) 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 15.1.2507.16; Mon, 2 Jan 2023 09:10:34 +0100 From: Jean-Jacques Hiblot To: , , , , CC: , , , , , , , Jean-Jacques Hiblot Subject: [PATCH v7 4/6] leds: class: store the color index in struct led_classdev Date: Mon, 2 Jan 2023 09:10:19 +0100 Message-ID: <20230102081021.138648-5-jjhiblot@traphandler.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230102081021.138648-1-jjhiblot@traphandler.com> References: <20230102081021.138648-1-jjhiblot@traphandler.com> MIME-Version: 1.0 X-Originating-IP: [88.161.25.233] X-ClientProxiedBy: DAG3EX2.emp2.local (172.16.2.22) To DAG1EX1.emp2.local (172.16.2.1) X-Ovh-Tracer-Id: 10482972560540056027 X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: 0 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvhedrjedugdduudeiucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuqfggjfdpvefjgfevmfevgfenuceurghilhhouhhtmecuhedttdenucenucfjughrpefhvfevufffkffojghfggfgtghisehtkeertdertddtnecuhfhrohhmpeflvggrnhdqlfgrtghquhgvshcujfhisghlohhtuceojhhjhhhisghlohhtsehtrhgrphhhrghnughlvghrrdgtohhmqeenucggtffrrghtthgvrhhnpeduteevleevvefggfdvueffffejhfehheeuiedtgedtjeeghfehueduudegfeefueenucfkphepuddvjedrtddrtddruddpkeekrdduiedurddvhedrvdeffeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepihhnvghtpeduvdejrddtrddtrddupdhmrghilhhfrhhomhepoehjjhhhihgslhhothesthhrrghphhgrnhgulhgvrhdrtghomheqpdhnsggprhgtphhtthhopedupdhrtghpthhtoheplhgvvgdrjhhonhgvsheslhhinhgrrhhordhorhhgpdhprghvvghlsehutgifrdgtiidprhhosghhodgutheskhgvrhhnvghlrdhorhhgpdhsvhgvnhdrshgthhifvghrmhgvrhesughishhruhhpthhivhgvqdhtvggthhhnohhlohhgihgvshdrtghomhdpkhhriiihshiithhofhdrkhhoiihlohifshhkihdoughtsehlihhnrghrohdrohhrghdpjhhohhgrnhdolhhinhgrrhhosehkvghrnhgvlhdrohhrghdpmhgrrhhijhhnrdhsuhhijhhtvghnsehsohhmrg hinhhlihhnvgdrohhrghdprghnugihrdhshhgvvhgthhgvnhhkohesghhmrghilhdrtghomhdpjhgrtggvkhdrrghnrghsiigvfihskhhisehgmhgrihhlrdgtohhmpdhlihhnuhigqdhlvggushesvhhgvghrrdhkvghrnhgvlhdrohhrghdpuggvvhhitggvthhrvggvsehvghgvrhdrkhgvrhhnvghlrdhorhhgpdhlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdpoffvtefjohhsthepmhhofedttdegpdhmohguvgepshhmthhpohhuth Precedence: bulk List-ID: X-Mailing-List: linux-leds@vger.kernel.org This information might be useful for more than only deriving the led's name. And since we have this information, we can expose it in the sysfs. Signed-off-by: Jean-Jacques Hiblot --- Documentation/ABI/testing/sysfs-class-led | 9 +++++++++ drivers/leds/led-class.c | 20 ++++++++++++++++++++ include/linux/leds.h | 1 + 3 files changed, 30 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-class-led b/Documentation/ABI/testing/sysfs-class-led index 2e24ac3bd7ef..6f38edd69d2a 100644 --- a/Documentation/ABI/testing/sysfs-class-led +++ b/Documentation/ABI/testing/sysfs-class-led @@ -59,6 +59,15 @@ Description: brightness. Reading this file when no hw brightness change event has happened will return an ENODATA error. +What: /sys/class/leds//color +Date: Dec 2022 +KernelVersion: 6.2 +Description: + Color of the led. + + This is a read-only file. Reading this file returns the color + of the led as a string (ex: "red", "green"). + What: /sys/class/leds//trigger Date: March 2006 KernelVersion: 2.6.17 diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c index 9cddcd908bce..4432e85a5fc6 100644 --- a/drivers/leds/led-class.c +++ b/drivers/leds/led-class.c @@ -74,6 +74,18 @@ static ssize_t max_brightness_show(struct device *dev, } static DEVICE_ATTR_RO(max_brightness); +static ssize_t color_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + const char *color_text = "invalid"; + struct led_classdev *led_cdev = dev_get_drvdata(dev); + + if (led_cdev->color < LED_COLOR_ID_MAX) + color_text = led_colors[led_cdev->color]; + return sysfs_emit(buf, "%s\n", color_text); +} +static DEVICE_ATTR_RO(color); + #ifdef CONFIG_LEDS_TRIGGERS static BIN_ATTR(trigger, 0644, led_trigger_read, led_trigger_write, 0); static struct bin_attribute *led_trigger_bin_attrs[] = { @@ -88,6 +100,7 @@ static const struct attribute_group led_trigger_group = { static struct attribute *led_class_attrs[] = { &dev_attr_brightness.attr, &dev_attr_max_brightness.attr, + &dev_attr_color.attr, NULL, }; @@ -375,6 +388,10 @@ int led_classdev_register_ext(struct device *parent, if (fwnode_property_present(init_data->fwnode, "retain-state-shutdown")) led_cdev->flags |= LED_RETAIN_AT_SHUTDOWN; + + if (fwnode_property_present(init_data->fwnode, "color")) + fwnode_property_read_u32(init_data->fwnode, "color", + &led_cdev->color); } } else { proposed_name = led_cdev->name; @@ -384,6 +401,9 @@ int led_classdev_register_ext(struct device *parent, if (ret < 0) return ret; + if (led_cdev->color >= LED_COLOR_ID_MAX) + dev_warn(parent, "LED %s color identifier out of range\n", final_name); + mutex_init(&led_cdev->led_access); mutex_lock(&led_cdev->led_access); led_cdev->dev = device_create_with_groups(leds_class, parent, 0, diff --git a/include/linux/leds.h b/include/linux/leds.h index 41df18f42d00..9d38cb90331d 100644 --- a/include/linux/leds.h +++ b/include/linux/leds.h @@ -71,6 +71,7 @@ struct led_classdev { const char *name; unsigned int brightness; unsigned int max_brightness; + unsigned int color; int flags; /* Lower 16 bits reflect status */