From patchwork Sat Mar 9 19:08:34 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 779591 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 255704A2A for ; Sat, 9 Mar 2024 19:08:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710011325; cv=none; b=WuyHkd2QHiO5ywVJiZ+m+M35FikDOGk3ZXKYoCa8pt3QGDwya6uIqoMc2B8Q6b1duM9pQxDuMNhh7CJIIUhR830Z3B2GVvWsIG3CXxM6Ju82CwU4w9DRsjC/p+lKFUPZTtUL7nUJKcgpiWGetaDR9RUrqscEukFQIKq+X5Y8vIk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710011325; c=relaxed/simple; bh=HOS0yUxWSvjQj5bmrVf6Q8FnmBzrt5b8k9JKtbCzaVs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ei1SCq9BfW3SBowN8BU92gr17xYV09Vj4Rf/1yV2UHOhNpzvMfS6zLCzuyqUz1d4KGEsN7GjokHbNpOk2Vq9MtW/33mQU9G0fO2mBrfAFOhlEZqaZi6HgZ4Dl8/bOgKXHKxRmD5Hm69d7MvyW9JUmWLVavLEaFeG1zFmtjmKZFs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=Kfiieu8X; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Kfiieu8X" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1710011323; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=8o/gnuQdrOI6Eypxc3N2qhWfsOWwmV1ZKkzkdiZ5/nY=; b=Kfiieu8X9W6GklkR050TXuEVzwyg2yOyLDhQN85j4hVZh0skaQaB7Zj8WTOwNGHGnMfQWw 1w1HGSUgtINbhRkwiWZ9Ee2SwEGEyGCpQ7/pr+M31+Jq4fLuspUs1xpdgG2EKUXaoHZGpx Oywrju+zFgfWyBFrLcbxhWvX4ur0neU= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-138-mMF__XR3NN2JoADjgVAiig-1; Sat, 09 Mar 2024 14:08:38 -0500 X-MC-Unique: mMF__XR3NN2JoADjgVAiig-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id EE8BA101A526; Sat, 9 Mar 2024 19:08:37 +0000 (UTC) Received: from shalem.redhat.com (unknown [10.39.192.12]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1BD631C05E1C; Sat, 9 Mar 2024 19:08:37 +0000 (UTC) From: Hans de Goede To: Pavel Machek , Lee Jones , Dan Murphy Cc: Hans de Goede , Kate Hsuan , linux-leds@vger.kernel.org Subject: [RFC 1/2] leds: core: Add led_mc_set_brightness() function Date: Sat, 9 Mar 2024 20:08:34 +0100 Message-ID: <20240309190835.173703-2-hdegoede@redhat.com> In-Reply-To: <20240309190835.173703-1-hdegoede@redhat.com> References: <20240309190835.173703-1-hdegoede@redhat.com> Precedence: bulk X-Mailing-List: linux-leds@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.7 Add a new led_mc_set_brightness() function for in kernel color/brightness changing of multi-color LEDs. led-class-multicolor can be build as a module and led_mc_set_brightness() will have builtin callers, so put led_mc_set_brightness() inside led-core instead, just like how led_set_brightness() is part of the core and not of the led-class object. This also adds a new LED_MULTI_COLOR led_classdev flag to allow led_mc_set_brightness() to verify that it is operating on a multi-color LED classdev, avoiding casting the passed in LED classdev to a multi-color LED classdev, when it actually is not a multi-color LED. Signed-off-by: Hans de Goede --- drivers/leds/led-class-multicolor.c | 1 + drivers/leds/led-core.c | 31 +++++++++++++++++++++++++++++ include/linux/leds.h | 20 +++++++++++++++++++ 3 files changed, 52 insertions(+) diff --git a/drivers/leds/led-class-multicolor.c b/drivers/leds/led-class-multicolor.c index ec62a4811613..df01c0e66c8b 100644 --- a/drivers/leds/led-class-multicolor.c +++ b/drivers/leds/led-class-multicolor.c @@ -134,6 +134,7 @@ int led_classdev_multicolor_register_ext(struct device *parent, return -EINVAL; led_cdev = &mcled_cdev->led_cdev; + led_cdev->flags |= LED_MULTI_COLOR; mcled_cdev->led_cdev.groups = led_multicolor_groups; return led_classdev_register_ext(parent, led_cdev, init_data); diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c index 89c9806cc97f..5889753ebc74 100644 --- a/drivers/leds/led-core.c +++ b/drivers/leds/led-core.c @@ -8,6 +8,7 @@ */ #include +#include #include #include #include @@ -362,6 +363,36 @@ int led_set_brightness_sync(struct led_classdev *led_cdev, unsigned int value) } EXPORT_SYMBOL_GPL(led_set_brightness_sync); +/* + * This is a led-core function because just like led_set_brightness() + * it is used in kernel by e.g. triggers. + */ +void led_mc_set_brightness(struct led_classdev *led_cdev, + unsigned int *intensity_value, unsigned int num_colors, + unsigned int brightness) +{ + struct led_classdev_mc *mcled_cdev; + unsigned int i; + + if (!(led_cdev->flags & LED_MULTI_COLOR)) { + dev_err_once(led_cdev->dev, "%s: error not a multi-color LED\n", __func__); + return; + } + + mcled_cdev = lcdev_to_mccdev(led_cdev); + if (num_colors != mcled_cdev->num_colors) { + dev_err_once(led_cdev->dev, "%s: error num_colors mismatch %d != %d\n", + __func__, num_colors, mcled_cdev->num_colors); + return; + } + + for (i = 0; i < mcled_cdev->num_colors; i++) + mcled_cdev->subled_info[i].intensity = intensity_value[i]; + + led_set_brightness(led_cdev, brightness); +} +EXPORT_SYMBOL_GPL(led_mc_set_brightness); + int led_update_brightness(struct led_classdev *led_cdev) { int ret; diff --git a/include/linux/leds.h b/include/linux/leds.h index 4754b02d3a2c..fed88eb9e170 100644 --- a/include/linux/leds.h +++ b/include/linux/leds.h @@ -115,6 +115,7 @@ struct led_classdev { #define LED_BRIGHT_HW_CHANGED BIT(21) #define LED_RETAIN_AT_SHUTDOWN BIT(22) #define LED_INIT_DEFAULT_TRIGGER BIT(23) +#define LED_MULTI_COLOR BIT(24) /* set_brightness_work / blink_timer flags, atomic, private. */ unsigned long work_flags; @@ -392,6 +393,25 @@ void led_set_brightness(struct led_classdev *led_cdev, unsigned int brightness); */ int led_set_brightness_sync(struct led_classdev *led_cdev, unsigned int value); +/** + * led_mc_set_brightness - set mc LED color intensity values and brightness + * @led_cdev: the LED to set + * @intensity_value: array of per color intensity values to set + * @num_colors: amount of entries in intensity_value array + * @brightness: the brightness to set the LED to + * + * Set a multi-color LED's per color intensity values and brightness. + * If necessary, this cancels the software blink timer. This function is + * guaranteed not to sleep. + * + * Calling this function on a non multi-color led_classdev or with the wrong + * num_colors value is an error. In this case an error will be logged once + * and the call will do nothing. + */ +void led_mc_set_brightness(struct led_classdev *led_cdev, + unsigned int *intensity_value, unsigned int num_colors, + unsigned int brightness); + /** * led_update_brightness - update LED brightness * @led_cdev: the LED to query