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[209.132.180.67]) by mx.google.com with ESMTP id y22si3071875ejw.144.2019.10.18.05.27.05; Fri, 18 Oct 2019 05:27:05 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@ti.com header.s=ti-com-17Q1 header.b=tXvqPLT9; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=NONE dis=NONE) header.from=ti.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2633883AbfJRM1C (ORCPT + 26 others); Fri, 18 Oct 2019 08:27:02 -0400 Received: from fllv0016.ext.ti.com ([198.47.19.142]:48396 "EHLO fllv0016.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388384AbfJRM0A (ORCPT ); Fri, 18 Oct 2019 08:26:00 -0400 Received: from fllv0034.itg.ti.com ([10.64.40.246]) by fllv0016.ext.ti.com (8.15.2/8.15.2) with ESMTP id x9ICPte1066220; Fri, 18 Oct 2019 07:25:55 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1571401555; bh=FPrJ1G2SUGEg3EfCVQ10S3wgUXXyt6yxKfxiPylb8lg=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=tXvqPLT9GisPzOnndWdIIIh6P1y5qoRCN0qGasvyV2Aw8itrPLd9WhC8HpPVZOBPk LeP1rjgEgtWWZ7Ix+kWIXsOkzvK7Fd1fDLjZrO/BJviOiNAkHyaLVktqFrzXXnpjrF 7EbHzm2F1nOX0X1DW+Z8nf5NV2bVFwJ8iujWY1JE= Received: from DFLE115.ent.ti.com (dfle115.ent.ti.com [10.64.6.36]) by fllv0034.itg.ti.com (8.15.2/8.15.2) with ESMTPS id x9ICPtgG053628 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 18 Oct 2019 07:25:55 -0500 Received: from DFLE110.ent.ti.com (10.64.6.31) by DFLE115.ent.ti.com (10.64.6.36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5; Fri, 18 Oct 2019 07:25:47 -0500 Received: from fllv0040.itg.ti.com (10.64.41.20) by DFLE110.ent.ti.com (10.64.6.31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5 via Frontend Transport; Fri, 18 Oct 2019 07:25:55 -0500 Received: from localhost (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0040.itg.ti.com (8.15.2/8.15.2) with ESMTP id x9ICPtrT092004; Fri, 18 Oct 2019 07:25:55 -0500 From: Dan Murphy To: , CC: , , Dan Murphy Subject: [PATCH v14 04/19] leds: multicolor: Introduce a multicolor class definition Date: Fri, 18 Oct 2019 07:25:06 -0500 Message-ID: <20191018122521.6757-5-dmurphy@ti.com> X-Mailer: git-send-email 2.22.0.214.g8dca754b1e In-Reply-To: <20191018122521.6757-1-dmurphy@ti.com> References: <20191018122521.6757-1-dmurphy@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introduce a multicolor class that groups colored LEDs within a LED node. The multi color class groups monochrome LEDs and allows controlling two aspects of the final combined color: hue and lightness. The former is controlled via _intensity files and the latter is controlled via brightness file. Signed-off-by: Dan Murphy --- .../ABI/testing/sysfs-class-led-multicolor | 36 +++ Documentation/leds/index.rst | 1 + Documentation/leds/leds-class-multicolor.rst | 100 +++++++ drivers/leds/Kconfig | 10 + drivers/leds/Makefile | 1 + drivers/leds/led-class-multicolor.c | 271 ++++++++++++++++++ include/linux/led-class-multicolor.h | 97 +++++++ 7 files changed, 516 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-class-led-multicolor create mode 100644 Documentation/leds/leds-class-multicolor.rst create mode 100644 drivers/leds/led-class-multicolor.c create mode 100644 include/linux/led-class-multicolor.h -- 2.22.0.214.g8dca754b1e diff --git a/Documentation/ABI/testing/sysfs-class-led-multicolor b/Documentation/ABI/testing/sysfs-class-led-multicolor new file mode 100644 index 000000000000..3d1f9d726c70 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-led-multicolor @@ -0,0 +1,36 @@ +What: /sys/class/leds//brightness +Date: Sept 2019 +KernelVersion: 5.5 +Contact: Dan Murphy +Description: read/write + Writing to this file will update all LEDs within the group to a + calculated percentage of what each color LED intensity is set + to. The percentage is calculated for each grouped LED via the + equation below: + + led_brightness = brightness * _intensity/_max_intensity + + For additional details please refer to + Documentation/leds/leds-class-multicolor.rst. + + The value of the color is from 0 to + /sys/class/leds//max_brightness. + +What: /sys/class/leds//colors/_intensity +Date: Sept 2019 +KernelVersion: 5.5 +Contact: Dan Murphy +Description: read/write + The _intensity file is created based on the color + defined by the registrar of the class. + There is one file per color presented. + + The value of the color is from 0 to + /sys/class/leds//colors/_max_intensity. + +What: /sys/class/leds//colors/_max_intensity +Date: Sept 2019 +KernelVersion: 5.5 +Contact: Dan Murphy +Description: read only + Maximum intensity level for the LED color. diff --git a/Documentation/leds/index.rst b/Documentation/leds/index.rst index 060f4e485897..bc70c6aa7138 100644 --- a/Documentation/leds/index.rst +++ b/Documentation/leds/index.rst @@ -9,6 +9,7 @@ LEDs leds-class leds-class-flash + leds-class-multicolor ledtrig-oneshot ledtrig-transient ledtrig-usbport diff --git a/Documentation/leds/leds-class-multicolor.rst b/Documentation/leds/leds-class-multicolor.rst new file mode 100644 index 000000000000..c8a224cead51 --- /dev/null +++ b/Documentation/leds/leds-class-multicolor.rst @@ -0,0 +1,100 @@ +==================================== +Multi Color LED handling under Linux +==================================== + +Description +=========== +The multi color class groups monochrome LEDs and allows controlling two +aspects of the final combined color: hue and lightness. The former is +controlled via _intensity files and the latter is controlled +via brightness file. + +For more details on hue and lightness notions please refer to +https://en.wikipedia.org/wiki/CIECAM02. + +Note that intensity files only cache the written value and the actual +change of hardware state occurs upon writing brightness file. This +allows for changing many factors of the perceived color in a virtually +unnoticeable way for the human observer. + +Multicolor Class Control +======================== +The multicolor class presents the LED groups under a directory called "colors". +This directory is a child under the LED parent node created by the led_class +framework. The led_class framework is documented in led-class.rst within this +documentation directory. + +Each colored LED will have two files created under the colors directory +_intensity and _max_intensity. These files will contain +one of LED_COLOR_ID_* definitions from the header +include/dt-bindings/leds/common.h. + +Directory Layout Example +======================== +root:/sys/class/leds/rgb:grouped_leds# ls -lR colors/ +-rw-r--r-- 1 root root 4096 Jul 7 03:10 blue_intensity +-r--r--r-- 1 root root 4096 Jul 7 03:10 blue_max_intensity +-rw-r--r-- 1 root root 4096 Jul 7 03:10 green_intensity +-r--r--r-- 1 root root 4096 Jul 7 03:10 green_max_intensity +-rw-r--r-- 1 root root 4096 Jul 7 03:10 red_intensity +-r--r--r-- 1 root root 4096 Jul 7 03:10 red_max_intensity + +Multicolor Class Brightness Control +=================================== +The multiclor class framework will calculate each monochrome LEDs intensity. + +The brightness level for each LED is calculated based on the color LED +intensity setting divided by the color LED max intensity setting multiplied by +the requested brightness. + +led_brightness = brightness * _intensity/_max_intensity + +It is important to note that for each LED within the cluster the +_max_intensity value should be the same. This will help maintain a +consistent hue across brightness levels. + +Example: +Three LEDs are present in the group as defined in "Directory Layout Example" +within this document. + +A user first writes the color LED brightness file with the brightness level that +is necessary to achieve a blueish violet output from the RGB LED group. + +echo 138 > /sys/class/leds/rgb:grouped_leds/red_intensity +echo 43 > /sys/class/leds/rgb:grouped_leds/green_intensity +echo 226 > /sys/class/leds/rgb:grouped_leds/blue_intensity + +red - + intensity = 138 + max_intensity = 255 +green - + intensity = 43 + max_intensity = 255 +blue - + intensity = 226 + max_intensity = 255 + +The user can control the brightness of that RGB group by writing the parent +'brightness' control. Assuming a parent max_brightness of 255 the user may want +to dim the LED color group to half. The user would write a value of 128 to the +parent brightness file then the values written to each LED will be adjusted +base on this value + +cat /sys/class/leds/rgb:grouped_leds/max_brightness +255 +echo 128 > /sys/class/leds/rgb:grouped_leds/brightness + +adjusted_red_value = 128 * 138/255 = 69 +adjusted_green_value = 128 * 43/255 = 21 +adjusted_blue_value = 128 * 226/255 = 113 + +Reading the parent brightness file will return the current brightness value of +the color LED group. + +cat /sys/class/leds/rgb:grouped_leds/max_brightness +255 + +echo 128 > /sys/class/leds/rgb:grouped_leds/brightness + +cat /sys/class/leds/rgb:grouped_leds/brightness +128 diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 4b68520ac251..a1ede89afc9e 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -30,6 +30,16 @@ config LEDS_CLASS_FLASH for the flash related features of a LED device. It can be built as a module. +config LEDS_CLASS_MULTI_COLOR + tristate "LED Mulit Color LED Class Support" + depends on LEDS_CLASS + help + This option enables the multicolor LED sysfs class in /sys/class/leds. + It wraps LED class and adds multicolor LED specific sysfs attributes + and kernel internal API to it. You'll need this to provide support + for multicolor LEDs that are grouped together. This class is not + intended for single color LEDs. It can be built as a module. + config LEDS_BRIGHTNESS_HW_CHANGED bool "LED Class brightness_hw_changed attribute support" depends on LEDS_CLASS diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 2da39e896ce8..841038cfe35b 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -4,6 +4,7 @@ obj-$(CONFIG_NEW_LEDS) += led-core.o obj-$(CONFIG_LEDS_CLASS) += led-class.o obj-$(CONFIG_LEDS_CLASS_FLASH) += led-class-flash.o +obj-$(CONFIG_LEDS_CLASS_MULTI_COLOR) += led-class-multicolor.o obj-$(CONFIG_LEDS_TRIGGERS) += led-triggers.o # LED Platform Drivers diff --git a/drivers/leds/led-class-multicolor.c b/drivers/leds/led-class-multicolor.c new file mode 100644 index 000000000000..453fd8e913e9 --- /dev/null +++ b/drivers/leds/led-class-multicolor.c @@ -0,0 +1,271 @@ +// SPDX-License-Identifier: GPL-2.0 +// LED Multi Color class interface +// Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/ + +#include +#include +#include +#include +#include +#include + +#include "leds.h" + +#define INTENSITY_NAME "_intensity" +#define MAX_INTENSITY_NAME "_max_intensity" + +int led_mc_calc_color_components(struct led_classdev_mc *mcled_cdev, + enum led_brightness brightness, + struct led_mc_color_conversion color_component[]) +{ + struct led_mc_color_entry *priv; + int i = 0; + + list_for_each_entry(priv, &mcled_cdev->color_list, list) { + color_component[i].color_id = priv->led_color_id; + color_component[i].brightness = brightness * + priv->intensity / priv->max_intensity; + i++; + } + + return 0; +} +EXPORT_SYMBOL_GPL(led_mc_calc_color_components); + +static ssize_t intensity_store(struct device *dev, + struct device_attribute *intensity_attr, + const char *buf, size_t size) +{ + struct led_mc_color_entry *priv = container_of(intensity_attr, + struct led_mc_color_entry, + intensity_attr); + struct led_classdev *led_cdev = priv->mcled_cdev->led_cdev; + unsigned long value; + ssize_t ret; + + mutex_lock(&led_cdev->led_access); + + ret = kstrtoul(buf, 10, &value); + if (ret) + goto unlock; + + if (value > priv->max_intensity) { + ret = -EINVAL; + goto unlock; + } + + priv->intensity = value; + ret = size; + +unlock: + mutex_unlock(&led_cdev->led_access); + return ret; +} + +static ssize_t intensity_show(struct device *dev, + struct device_attribute *intensity_attr, + char *buf) +{ + struct led_mc_color_entry *priv = container_of(intensity_attr, + struct led_mc_color_entry, + intensity_attr); + + return sprintf(buf, "%d\n", priv->intensity); +} + +static ssize_t max_intensity_show(struct device *dev, + struct device_attribute *max_intensity_attr, + char *buf) +{ + struct led_mc_color_entry *priv = container_of(max_intensity_attr, + struct led_mc_color_entry, + max_intensity_attr); + + return sprintf(buf, "%d\n", priv->max_intensity); +} + +static struct attribute *led_color_attrs[] = { + NULL, +}; + +static struct attribute_group led_color_group = { + .name = "colors", + .attrs = led_color_attrs, +}; + +static int led_multicolor_init_color(struct led_classdev_mc *mcled_cdev, + int color_id) +{ + struct led_classdev *led_cdev = mcled_cdev->led_cdev; + struct led_mc_color_entry *mc_priv; + char *intensity_file_name; + char *max_intensity_file_name; + size_t len; + int ret; + + mc_priv = devm_kzalloc(led_cdev->dev, sizeof(*mc_priv), GFP_KERNEL); + if (!mc_priv) + return -ENOMEM; + + mc_priv->led_color_id = color_id; + mc_priv->mcled_cdev = mcled_cdev; + + sysfs_attr_init(&mc_priv->intensity_attr.attr); + len = strlen(led_colors[color_id]) + strlen(INTENSITY_NAME) + 1; + intensity_file_name = kzalloc(len, GFP_KERNEL); + if (!intensity_file_name) + return -ENOMEM; + + snprintf(intensity_file_name, len, "%s%s", + led_colors[color_id], INTENSITY_NAME); + mc_priv->intensity_attr.attr.name = intensity_file_name; + mc_priv->intensity_attr.attr.mode = 0644; + mc_priv->intensity_attr.store = intensity_store; + mc_priv->intensity_attr.show = intensity_show; + ret = sysfs_add_file_to_group(&led_cdev->dev->kobj, + &mc_priv->intensity_attr.attr, + led_color_group.name); + if (ret) + goto intensity_err_out; + + sysfs_attr_init(&mc_priv->max_intensity_attr.attr); + len = strlen(led_colors[color_id]) + strlen(MAX_INTENSITY_NAME) + 1; + max_intensity_file_name = kzalloc(len, GFP_KERNEL); + if (!max_intensity_file_name) { + ret = -ENOMEM; + goto intensity_err_out; + } + + snprintf(max_intensity_file_name, len, "%s%s", + led_colors[color_id], MAX_INTENSITY_NAME); + mc_priv->max_intensity_attr.attr.name = max_intensity_file_name; + mc_priv->max_intensity_attr.attr.mode = 0444; + mc_priv->max_intensity_attr.show = max_intensity_show; + ret = sysfs_add_file_to_group(&led_cdev->dev->kobj, + &mc_priv->max_intensity_attr.attr, + led_color_group.name); + if (ret) + goto max_intensity_err_out; + + mc_priv->max_intensity = LED_FULL; + list_add_tail(&mc_priv->list, &mcled_cdev->color_list); + +max_intensity_err_out: + kfree(max_intensity_file_name); +intensity_err_out: + kfree(intensity_file_name); + return ret; +} + +static int led_multicolor_init_color_dir(struct led_classdev_mc *mcled_cdev) +{ + struct led_classdev *led_cdev = mcled_cdev->led_cdev; + int ret; + int i; + + ret = sysfs_create_group(&led_cdev->dev->kobj, &led_color_group); + if (ret) + return ret; + + for (i = 0; i < LED_COLOR_ID_MAX; i++) { + if (test_bit(i, &mcled_cdev->available_colors)) { + ret = led_multicolor_init_color(mcled_cdev, i); + if (ret) + break; + + } + } + + return ret; +} + +int led_classdev_multicolor_register_ext(struct device *parent, + struct led_classdev_mc *mcled_cdev, + struct led_init_data *init_data) +{ + struct led_classdev *led_cdev; + int ret; + + if (!mcled_cdev) + return -EINVAL; + + led_cdev = mcled_cdev->led_cdev; + INIT_LIST_HEAD(&mcled_cdev->color_list); + + /* Register led class device */ + ret = led_classdev_register_ext(parent, led_cdev, init_data); + if (ret) + return ret; + + return led_multicolor_init_color_dir(mcled_cdev); +} +EXPORT_SYMBOL_GPL(led_classdev_multicolor_register_ext); + +void led_classdev_multicolor_unregister(struct led_classdev_mc *mcled_cdev) +{ + struct led_mc_color_entry *priv, *next; + + if (!mcled_cdev) + return; + + list_for_each_entry_safe(priv, next, &mcled_cdev->color_list, list) + list_del(&priv->list); + + sysfs_remove_group(&mcled_cdev->led_cdev->dev->kobj, &led_color_group); + led_classdev_unregister(mcled_cdev->led_cdev); +} +EXPORT_SYMBOL_GPL(led_classdev_multicolor_unregister); + +static void devm_led_classdev_multicolor_release(struct device *dev, void *res) +{ + led_classdev_multicolor_unregister(*(struct led_classdev_mc **)res); +} + +int devm_led_classdev_multicolor_register_ext(struct device *parent, + struct led_classdev_mc *mcled_cdev, + struct led_init_data *init_data) +{ + struct led_classdev_mc **dr; + int ret; + + dr = devres_alloc(devm_led_classdev_multicolor_release, + sizeof(*dr), GFP_KERNEL); + if (!dr) + return -ENOMEM; + + ret = led_classdev_multicolor_register(parent, mcled_cdev); + if (ret) { + devres_free(dr); + return ret; + } + + *dr = mcled_cdev; + devres_add(parent, dr); + + return 0; +} +EXPORT_SYMBOL_GPL(devm_led_classdev_multicolor_register_ext); + +static int devm_led_classdev_multicolor_match(struct device *dev, + void *res, void *data) +{ + struct led_classdev_mc **p = res; + + if (WARN_ON(!p || !*p)) + return 0; + + return *p == data; +} + +void devm_led_classdev_multicolor_unregister(struct device *dev, + struct led_classdev_mc *mcled_cdev) +{ + WARN_ON(devres_release(dev, + devm_led_classdev_multicolor_release, + devm_led_classdev_multicolor_match, mcled_cdev)); +} +EXPORT_SYMBOL_GPL(devm_led_classdev_multicolor_unregister); + +MODULE_AUTHOR("Dan Murphy "); +MODULE_DESCRIPTION("Multi Color LED class interface"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/led-class-multicolor.h b/include/linux/led-class-multicolor.h new file mode 100644 index 000000000000..32b0d8cdc577 --- /dev/null +++ b/include/linux/led-class-multicolor.h @@ -0,0 +1,97 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* LED Multicolor class interface + * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/ + */ + +#ifndef __LINUX_MULTICOLOR_LEDS_H_INCLUDED +#define __LINUX_MULTICOLOR_LEDS_H_INCLUDED + +#include +#include + +struct led_classdev_mc; + +struct led_mc_color_conversion { + int color_id; + int brightness; + int output_num; +}; + +struct led_mc_color_entry { + struct led_classdev_mc *mcled_cdev; + + struct device_attribute max_intensity_attr; + struct device_attribute intensity_attr; + + enum led_brightness max_intensity; + enum led_brightness intensity; + + struct list_head list; + + int led_color_id; +}; + +struct led_classdev_mc { + /* led class device */ + struct led_classdev *led_cdev; + struct list_head color_list; + + unsigned long available_colors; + int num_leds; +}; + +static inline struct led_classdev_mc *lcdev_to_mccdev( + struct led_classdev *lcdev) +{ + return container_of(lcdev, struct led_classdev_mc, led_cdev); +} + +/** + * led_classdev_multicolor_register_ext - register a new object of led_classdev + * class with support for multicolor LEDs + * @parent: the multicolor LED to register + * @mcled_cdev: the led_classdev_mc structure for this device + * @init_data: the LED class Multi color device initialization data + * + * Returns: 0 on success or negative error value on failure + */ +int led_classdev_multicolor_register_ext(struct device *parent, + struct led_classdev_mc *mcled_cdev, + struct led_init_data *init_data); + +static inline int led_classdev_multicolor_register(struct device *parent, + struct led_classdev_mc *mcled_cdev) +{ + return led_classdev_multicolor_register_ext(parent, mcled_cdev, NULL); +} + +/** + * led_classdev_multicolor_unregister - unregisters an object of led_classdev + * class with support for multicolor LEDs + * @mcled_cdev: the multicolor LED to unregister + * + * Unregister a previously registered via led_classdev_multicolor_register + * object + */ +void led_classdev_multicolor_unregister(struct led_classdev_mc *mcled_cdev); + +/* Calculate brightness for the monochrome LED cluster */ +int led_mc_calc_color_components(struct led_classdev_mc *mcled_cdev, + enum led_brightness brightness, + struct led_mc_color_conversion color_component[]); + +int devm_led_classdev_multicolor_register_ext(struct device *parent, + struct led_classdev_mc *mcled_cdev, + struct led_init_data *init_data); + +static inline int devm_led_classdev_multicolor_register(struct device *parent, + struct led_classdev_mc *mcled_cdev) +{ + return devm_led_classdev_multicolor_register_ext(parent, mcled_cdev, + NULL); +} + +void devm_led_classdev_multicolor_unregister(struct device *parent, + struct led_classdev_mc *mcled_cdev); + +#endif /* __LINUX_MULTICOLOR_LEDS_H_INCLUDED */