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UPSTREAM: leds: multicolor: Introduce a multicolor class definition
Introduce a multicolor class that groups colored LEDs within a LED node. The multicolor class groups monochrome LEDs and allows controlling two aspects of the final combined color: hue and lightness. The former is controlled via the intensity file and the latter is controlled via brightness file. Signed-off-by: Dan Murphy <[email protected]> Acked-by: Jacek Anaszewski <[email protected]> Signed-off-by: Pavel Machek <[email protected]> [squashed leds: multicolor: Fix camel case in documentation in] Bug: 260685629 (cherry picked from commit 55d5d3b46b08a4dc0b05343d24640744e7430ed7) Change-Id: Ib1f41d74ace8e3a9c1071d52202c8d8b70a912e0 Signed-off-by: Farid Chahla <[email protected]>
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Dan Murphy
Treehugger Robot
parent
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commit
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7 changed files with 457 additions and 0 deletions
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@ -30,6 +30,16 @@ config LEDS_CLASS_FLASH
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for the flash related features of a LED device. It can be built
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as a module.
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config LEDS_CLASS_MULTICOLOR
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tristate "LED Multicolor Class Support"
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depends on LEDS_CLASS
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help
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This option enables the multicolor LED sysfs class in /sys/class/leds.
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It wraps LED class and adds multicolor LED specific sysfs attributes
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and kernel internal API to it. You'll need this to provide support
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for multicolor LEDs that are grouped together. This class is not
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intended for single color LEDs. It can be built as a module.
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config LEDS_BRIGHTNESS_HW_CHANGED
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bool "LED Class brightness_hw_changed attribute support"
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depends on LEDS_CLASS
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@ -4,6 +4,7 @@
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obj-$(CONFIG_NEW_LEDS) += led-core.o
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obj-$(CONFIG_LEDS_CLASS) += led-class.o
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obj-$(CONFIG_LEDS_CLASS_FLASH) += led-class-flash.o
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obj-$(CONFIG_LEDS_CLASS_MULTICOLOR) += led-class-multicolor.o
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obj-$(CONFIG_LEDS_TRIGGERS) += led-triggers.o
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# LED Platform Drivers
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203
drivers/leds/led-class-multicolor.c
Normal file
203
drivers/leds/led-class-multicolor.c
Normal file
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@ -0,0 +1,203 @@
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// SPDX-License-Identifier: GPL-2.0
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// LED Multicolor class interface
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// Copyright (C) 2019-20 Texas Instruments Incorporated - http://www.ti.com/
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// Author: Dan Murphy <[email protected]>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/led-class-multicolor.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include "leds.h"
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int led_mc_calc_color_components(struct led_classdev_mc *mcled_cdev,
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enum led_brightness brightness)
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{
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struct led_classdev *led_cdev = &mcled_cdev->led_cdev;
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int i;
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for (i = 0; i < mcled_cdev->num_colors; i++)
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mcled_cdev->subled_info[i].brightness = brightness *
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mcled_cdev->subled_info[i].intensity /
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led_cdev->max_brightness;
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return 0;
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}
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EXPORT_SYMBOL_GPL(led_mc_calc_color_components);
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static ssize_t multi_intensity_store(struct device *dev,
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struct device_attribute *intensity_attr,
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const char *buf, size_t size)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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struct led_classdev_mc *mcled_cdev = lcdev_to_mccdev(led_cdev);
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int nrchars, offset = 0;
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int intensity_value[LED_COLOR_ID_MAX];
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int i;
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ssize_t ret;
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mutex_lock(&led_cdev->led_access);
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for (i = 0; i < mcled_cdev->num_colors; i++) {
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ret = sscanf(buf + offset, "%i%n",
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&intensity_value[i], &nrchars);
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if (ret != 1) {
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ret = -EINVAL;
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goto err_out;
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}
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offset += nrchars;
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}
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offset++;
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if (offset < size) {
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ret = -EINVAL;
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goto err_out;
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}
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for (i = 0; i < mcled_cdev->num_colors; i++)
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mcled_cdev->subled_info[i].intensity = intensity_value[i];
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led_set_brightness(led_cdev, led_cdev->brightness);
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ret = size;
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err_out:
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mutex_unlock(&led_cdev->led_access);
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return ret;
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}
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static ssize_t multi_intensity_show(struct device *dev,
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struct device_attribute *intensity_attr,
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char *buf)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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struct led_classdev_mc *mcled_cdev = lcdev_to_mccdev(led_cdev);
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int len = 0;
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int i;
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for (i = 0; i < mcled_cdev->num_colors; i++) {
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len += sprintf(buf + len, "%d",
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mcled_cdev->subled_info[i].intensity);
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if (i < mcled_cdev->num_colors - 1)
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len += sprintf(buf + len, " ");
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}
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buf[len++] = '\n';
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return len;
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}
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static DEVICE_ATTR_RW(multi_intensity);
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static ssize_t multi_index_show(struct device *dev,
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struct device_attribute *multi_index_attr,
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char *buf)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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struct led_classdev_mc *mcled_cdev = lcdev_to_mccdev(led_cdev);
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int len = 0;
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int index;
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int i;
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for (i = 0; i < mcled_cdev->num_colors; i++) {
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index = mcled_cdev->subled_info[i].color_index;
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len += sprintf(buf + len, "%s", led_colors[index]);
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if (i < mcled_cdev->num_colors - 1)
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len += sprintf(buf + len, " ");
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}
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buf[len++] = '\n';
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return len;
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}
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static DEVICE_ATTR_RO(multi_index);
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static struct attribute *led_multicolor_attrs[] = {
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&dev_attr_multi_intensity.attr,
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&dev_attr_multi_index.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(led_multicolor);
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int led_classdev_multicolor_register_ext(struct device *parent,
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struct led_classdev_mc *mcled_cdev,
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struct led_init_data *init_data)
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{
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struct led_classdev *led_cdev;
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if (!mcled_cdev)
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return -EINVAL;
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if (mcled_cdev->num_colors <= 0)
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return -EINVAL;
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if (mcled_cdev->num_colors > LED_COLOR_ID_MAX)
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return -EINVAL;
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led_cdev = &mcled_cdev->led_cdev;
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mcled_cdev->led_cdev.groups = led_multicolor_groups;
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return led_classdev_register_ext(parent, led_cdev, init_data);
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}
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EXPORT_SYMBOL_GPL(led_classdev_multicolor_register_ext);
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void led_classdev_multicolor_unregister(struct led_classdev_mc *mcled_cdev)
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{
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if (!mcled_cdev)
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return;
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led_classdev_unregister(&mcled_cdev->led_cdev);
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}
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EXPORT_SYMBOL_GPL(led_classdev_multicolor_unregister);
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static void devm_led_classdev_multicolor_release(struct device *dev, void *res)
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{
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led_classdev_multicolor_unregister(*(struct led_classdev_mc **)res);
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}
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int devm_led_classdev_multicolor_register_ext(struct device *parent,
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struct led_classdev_mc *mcled_cdev,
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struct led_init_data *init_data)
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{
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struct led_classdev_mc **dr;
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int ret;
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dr = devres_alloc(devm_led_classdev_multicolor_release,
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sizeof(*dr), GFP_KERNEL);
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if (!dr)
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return -ENOMEM;
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ret = led_classdev_multicolor_register_ext(parent, mcled_cdev,
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init_data);
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if (ret) {
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devres_free(dr);
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return ret;
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}
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*dr = mcled_cdev;
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devres_add(parent, dr);
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return 0;
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}
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EXPORT_SYMBOL_GPL(devm_led_classdev_multicolor_register_ext);
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static int devm_led_classdev_multicolor_match(struct device *dev,
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void *res, void *data)
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{
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struct led_classdev_mc **p = res;
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if (WARN_ON(!p || !*p))
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return 0;
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return *p == data;
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}
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void devm_led_classdev_multicolor_unregister(struct device *dev,
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struct led_classdev_mc *mcled_cdev)
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{
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WARN_ON(devres_release(dev,
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devm_led_classdev_multicolor_release,
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devm_led_classdev_multicolor_match, mcled_cdev));
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}
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EXPORT_SYMBOL_GPL(devm_led_classdev_multicolor_unregister);
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MODULE_AUTHOR("Dan Murphy <[email protected]>");
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MODULE_DESCRIPTION("Multicolor LED class interface");
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MODULE_LICENSE("GPL v2");
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