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![Heiner Kallweit](/assets/img/avatar_default.png)
If a hw_control_trigger is defined, it's usually desirable to make it the default trigger. Therefore make it the default trigger, except the driver explicitly set a default trigger. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Link: https://lore.kernel.org/r/f33543de-3800-488f-a779-1fa282614462@gmail.com Signed-off-by: Lee Jones <lee@kernel.org>
690 lines
17 KiB
C
690 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* LED Class Core
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*
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* Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
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* Copyright (C) 2005-2007 Richard Purdie <rpurdie@openedhand.com>
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*/
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#include <linux/ctype.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/leds.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/property.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/timer.h>
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#include <uapi/linux/uleds.h>
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#include <linux/of.h>
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#include "leds.h"
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static DEFINE_MUTEX(leds_lookup_lock);
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static LIST_HEAD(leds_lookup_list);
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static ssize_t brightness_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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/* no lock needed for this */
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led_update_brightness(led_cdev);
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return sprintf(buf, "%u\n", led_cdev->brightness);
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}
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static ssize_t brightness_store(struct device *dev,
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struct device_attribute *attr, 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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unsigned long state;
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ssize_t ret;
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mutex_lock(&led_cdev->led_access);
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if (led_sysfs_is_disabled(led_cdev)) {
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ret = -EBUSY;
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goto unlock;
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}
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ret = kstrtoul(buf, 10, &state);
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if (ret)
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goto unlock;
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if (state == LED_OFF)
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led_trigger_remove(led_cdev);
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led_set_brightness(led_cdev, state);
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flush_work(&led_cdev->set_brightness_work);
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ret = size;
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unlock:
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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 DEVICE_ATTR_RW(brightness);
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static ssize_t max_brightness_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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return sprintf(buf, "%u\n", led_cdev->max_brightness);
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}
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static DEVICE_ATTR_RO(max_brightness);
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#ifdef CONFIG_LEDS_TRIGGERS
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static BIN_ATTR(trigger, 0644, led_trigger_read, led_trigger_write, 0);
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static struct bin_attribute *led_trigger_bin_attrs[] = {
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&bin_attr_trigger,
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NULL,
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};
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static const struct attribute_group led_trigger_group = {
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.bin_attrs = led_trigger_bin_attrs,
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};
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#endif
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static struct attribute *led_class_attrs[] = {
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&dev_attr_brightness.attr,
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&dev_attr_max_brightness.attr,
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NULL,
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};
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static const struct attribute_group led_group = {
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.attrs = led_class_attrs,
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};
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static const struct attribute_group *led_groups[] = {
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&led_group,
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#ifdef CONFIG_LEDS_TRIGGERS
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&led_trigger_group,
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#endif
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NULL,
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};
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#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
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static ssize_t brightness_hw_changed_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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if (led_cdev->brightness_hw_changed == -1)
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return -ENODATA;
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return sprintf(buf, "%u\n", led_cdev->brightness_hw_changed);
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}
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static DEVICE_ATTR_RO(brightness_hw_changed);
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static int led_add_brightness_hw_changed(struct led_classdev *led_cdev)
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{
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struct device *dev = led_cdev->dev;
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int ret;
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ret = device_create_file(dev, &dev_attr_brightness_hw_changed);
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if (ret) {
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dev_err(dev, "Error creating brightness_hw_changed\n");
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return ret;
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}
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led_cdev->brightness_hw_changed_kn =
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sysfs_get_dirent(dev->kobj.sd, "brightness_hw_changed");
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if (!led_cdev->brightness_hw_changed_kn) {
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dev_err(dev, "Error getting brightness_hw_changed kn\n");
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device_remove_file(dev, &dev_attr_brightness_hw_changed);
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return -ENXIO;
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}
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return 0;
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}
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static void led_remove_brightness_hw_changed(struct led_classdev *led_cdev)
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{
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sysfs_put(led_cdev->brightness_hw_changed_kn);
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device_remove_file(led_cdev->dev, &dev_attr_brightness_hw_changed);
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}
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void led_classdev_notify_brightness_hw_changed(struct led_classdev *led_cdev, unsigned int brightness)
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{
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if (WARN_ON(!led_cdev->brightness_hw_changed_kn))
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return;
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led_cdev->brightness_hw_changed = brightness;
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sysfs_notify_dirent(led_cdev->brightness_hw_changed_kn);
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}
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EXPORT_SYMBOL_GPL(led_classdev_notify_brightness_hw_changed);
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#else
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static int led_add_brightness_hw_changed(struct led_classdev *led_cdev)
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{
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return 0;
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}
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static void led_remove_brightness_hw_changed(struct led_classdev *led_cdev)
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{
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}
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#endif
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/**
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* led_classdev_suspend - suspend an led_classdev.
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* @led_cdev: the led_classdev to suspend.
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*/
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void led_classdev_suspend(struct led_classdev *led_cdev)
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{
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led_cdev->flags |= LED_SUSPENDED;
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led_set_brightness_nopm(led_cdev, 0);
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flush_work(&led_cdev->set_brightness_work);
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}
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EXPORT_SYMBOL_GPL(led_classdev_suspend);
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/**
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* led_classdev_resume - resume an led_classdev.
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* @led_cdev: the led_classdev to resume.
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*/
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void led_classdev_resume(struct led_classdev *led_cdev)
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{
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led_set_brightness_nopm(led_cdev, led_cdev->brightness);
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if (led_cdev->flash_resume)
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led_cdev->flash_resume(led_cdev);
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led_cdev->flags &= ~LED_SUSPENDED;
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}
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EXPORT_SYMBOL_GPL(led_classdev_resume);
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#ifdef CONFIG_PM_SLEEP
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static int led_suspend(struct device *dev)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
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led_classdev_suspend(led_cdev);
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return 0;
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}
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static int led_resume(struct device *dev)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
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led_classdev_resume(led_cdev);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(leds_class_dev_pm_ops, led_suspend, led_resume);
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static struct led_classdev *led_module_get(struct device *led_dev)
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{
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struct led_classdev *led_cdev;
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if (!led_dev)
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return ERR_PTR(-EPROBE_DEFER);
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led_cdev = dev_get_drvdata(led_dev);
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if (!try_module_get(led_cdev->dev->parent->driver->owner)) {
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put_device(led_cdev->dev);
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return ERR_PTR(-ENODEV);
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}
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return led_cdev;
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}
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static const struct class leds_class = {
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.name = "leds",
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.dev_groups = led_groups,
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.pm = &leds_class_dev_pm_ops,
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};
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/**
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* of_led_get() - request a LED device via the LED framework
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* @np: device node to get the LED device from
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* @index: the index of the LED
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*
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* Returns the LED device parsed from the phandle specified in the "leds"
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* property of a device tree node or a negative error-code on failure.
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*/
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struct led_classdev *of_led_get(struct device_node *np, int index)
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{
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struct device *led_dev;
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struct device_node *led_node;
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led_node = of_parse_phandle(np, "leds", index);
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if (!led_node)
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return ERR_PTR(-ENOENT);
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led_dev = class_find_device_by_of_node(&leds_class, led_node);
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of_node_put(led_node);
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put_device(led_dev);
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return led_module_get(led_dev);
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}
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EXPORT_SYMBOL_GPL(of_led_get);
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/**
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* led_put() - release a LED device
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* @led_cdev: LED device
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*/
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void led_put(struct led_classdev *led_cdev)
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{
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module_put(led_cdev->dev->parent->driver->owner);
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put_device(led_cdev->dev);
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}
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EXPORT_SYMBOL_GPL(led_put);
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static void devm_led_release(struct device *dev, void *res)
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{
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struct led_classdev **p = res;
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led_put(*p);
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}
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static struct led_classdev *__devm_led_get(struct device *dev, struct led_classdev *led)
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{
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struct led_classdev **dr;
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dr = devres_alloc(devm_led_release, sizeof(struct led_classdev *), GFP_KERNEL);
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if (!dr) {
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led_put(led);
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return ERR_PTR(-ENOMEM);
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}
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*dr = led;
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devres_add(dev, dr);
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return led;
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}
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/**
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* devm_of_led_get - Resource-managed request of a LED device
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* @dev: LED consumer
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* @index: index of the LED to obtain in the consumer
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*
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* The device node of the device is parse to find the request LED device.
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* The LED device returned from this function is automatically released
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* on driver detach.
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*
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* @return a pointer to a LED device or ERR_PTR(errno) on failure.
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*/
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struct led_classdev *__must_check devm_of_led_get(struct device *dev,
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int index)
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{
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struct led_classdev *led;
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if (!dev)
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return ERR_PTR(-EINVAL);
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led = of_led_get(dev->of_node, index);
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if (IS_ERR(led))
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return led;
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return __devm_led_get(dev, led);
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}
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EXPORT_SYMBOL_GPL(devm_of_led_get);
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/**
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* led_get() - request a LED device via the LED framework
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* @dev: device for which to get the LED device
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* @con_id: name of the LED from the device's point of view
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*
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* @return a pointer to a LED device or ERR_PTR(errno) on failure.
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*/
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struct led_classdev *led_get(struct device *dev, char *con_id)
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{
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struct led_lookup_data *lookup;
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const char *provider = NULL;
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struct device *led_dev;
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mutex_lock(&leds_lookup_lock);
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list_for_each_entry(lookup, &leds_lookup_list, list) {
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if (!strcmp(lookup->dev_id, dev_name(dev)) &&
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!strcmp(lookup->con_id, con_id)) {
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provider = kstrdup_const(lookup->provider, GFP_KERNEL);
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break;
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}
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}
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mutex_unlock(&leds_lookup_lock);
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if (!provider)
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return ERR_PTR(-ENOENT);
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led_dev = class_find_device_by_name(&leds_class, provider);
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kfree_const(provider);
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return led_module_get(led_dev);
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}
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EXPORT_SYMBOL_GPL(led_get);
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/**
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* devm_led_get() - request a LED device via the LED framework
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* @dev: device for which to get the LED device
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* @con_id: name of the LED from the device's point of view
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*
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* The LED device returned from this function is automatically released
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* on driver detach.
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*
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* @return a pointer to a LED device or ERR_PTR(errno) on failure.
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*/
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struct led_classdev *devm_led_get(struct device *dev, char *con_id)
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{
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struct led_classdev *led;
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led = led_get(dev, con_id);
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if (IS_ERR(led))
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return led;
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return __devm_led_get(dev, led);
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}
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EXPORT_SYMBOL_GPL(devm_led_get);
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/**
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* led_add_lookup() - Add a LED lookup table entry
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* @led_lookup: the lookup table entry to add
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*
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* Add a LED lookup table entry. On systems without devicetree the lookup table
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* is used by led_get() to find LEDs.
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*/
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void led_add_lookup(struct led_lookup_data *led_lookup)
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{
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mutex_lock(&leds_lookup_lock);
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list_add_tail(&led_lookup->list, &leds_lookup_list);
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mutex_unlock(&leds_lookup_lock);
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}
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EXPORT_SYMBOL_GPL(led_add_lookup);
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/**
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* led_remove_lookup() - Remove a LED lookup table entry
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* @led_lookup: the lookup table entry to remove
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*/
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void led_remove_lookup(struct led_lookup_data *led_lookup)
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{
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mutex_lock(&leds_lookup_lock);
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list_del(&led_lookup->list);
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mutex_unlock(&leds_lookup_lock);
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}
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EXPORT_SYMBOL_GPL(led_remove_lookup);
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/**
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* devm_of_led_get_optional - Resource-managed request of an optional LED device
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* @dev: LED consumer
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* @index: index of the LED to obtain in the consumer
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*
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* The device node of the device is parsed to find the requested LED device.
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* The LED device returned from this function is automatically released
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* on driver detach.
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*
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* @return a pointer to a LED device, ERR_PTR(errno) on failure and NULL if the
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* led was not found.
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*/
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struct led_classdev *__must_check devm_of_led_get_optional(struct device *dev,
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int index)
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{
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struct led_classdev *led;
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led = devm_of_led_get(dev, index);
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if (IS_ERR(led) && PTR_ERR(led) == -ENOENT)
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return NULL;
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return led;
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}
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EXPORT_SYMBOL_GPL(devm_of_led_get_optional);
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static int led_classdev_next_name(const char *init_name, char *name,
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size_t len)
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{
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unsigned int i = 0;
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int ret = 0;
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struct device *dev;
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strscpy(name, init_name, len);
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while ((ret < len) &&
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(dev = class_find_device_by_name(&leds_class, name))) {
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put_device(dev);
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ret = snprintf(name, len, "%s_%u", init_name, ++i);
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}
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if (ret >= len)
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return -ENOMEM;
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return i;
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}
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/**
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* led_classdev_register_ext - register a new object of led_classdev class
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* with init data.
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*
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* @parent: parent of LED device
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* @led_cdev: the led_classdev structure for this device.
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* @init_data: LED class device initialization data
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*/
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int led_classdev_register_ext(struct device *parent,
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struct led_classdev *led_cdev,
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struct led_init_data *init_data)
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{
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char composed_name[LED_MAX_NAME_SIZE];
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char final_name[LED_MAX_NAME_SIZE];
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const char *proposed_name = composed_name;
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int ret;
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if (init_data) {
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if (init_data->devname_mandatory && !init_data->devicename) {
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dev_err(parent, "Mandatory device name is missing");
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return -EINVAL;
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}
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ret = led_compose_name(parent, init_data, composed_name);
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if (ret < 0)
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return ret;
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if (init_data->fwnode) {
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fwnode_property_read_string(init_data->fwnode,
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"linux,default-trigger",
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&led_cdev->default_trigger);
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if (fwnode_property_present(init_data->fwnode,
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"retain-state-shutdown"))
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led_cdev->flags |= LED_RETAIN_AT_SHUTDOWN;
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fwnode_property_read_u32(init_data->fwnode,
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"max-brightness",
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&led_cdev->max_brightness);
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if (fwnode_property_present(init_data->fwnode, "color"))
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fwnode_property_read_u32(init_data->fwnode, "color",
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&led_cdev->color);
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}
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} else {
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proposed_name = led_cdev->name;
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}
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ret = led_classdev_next_name(proposed_name, final_name, sizeof(final_name));
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if (ret < 0)
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return ret;
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if (led_cdev->color >= LED_COLOR_ID_MAX)
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dev_warn(parent, "LED %s color identifier out of range\n", final_name);
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mutex_init(&led_cdev->led_access);
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mutex_lock(&led_cdev->led_access);
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led_cdev->dev = device_create_with_groups(&leds_class, parent, 0,
|
|
led_cdev, led_cdev->groups, "%s", final_name);
|
|
if (IS_ERR(led_cdev->dev)) {
|
|
mutex_unlock(&led_cdev->led_access);
|
|
return PTR_ERR(led_cdev->dev);
|
|
}
|
|
if (init_data && init_data->fwnode)
|
|
device_set_node(led_cdev->dev, init_data->fwnode);
|
|
|
|
if (ret)
|
|
dev_warn(parent, "Led %s renamed to %s due to name collision",
|
|
proposed_name, dev_name(led_cdev->dev));
|
|
|
|
if (led_cdev->flags & LED_BRIGHT_HW_CHANGED) {
|
|
ret = led_add_brightness_hw_changed(led_cdev);
|
|
if (ret) {
|
|
device_unregister(led_cdev->dev);
|
|
led_cdev->dev = NULL;
|
|
mutex_unlock(&led_cdev->led_access);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
led_cdev->work_flags = 0;
|
|
#ifdef CONFIG_LEDS_TRIGGERS
|
|
init_rwsem(&led_cdev->trigger_lock);
|
|
#endif
|
|
#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
|
|
led_cdev->brightness_hw_changed = -1;
|
|
#endif
|
|
/* add to the list of leds */
|
|
down_write(&leds_list_lock);
|
|
list_add_tail(&led_cdev->node, &leds_list);
|
|
up_write(&leds_list_lock);
|
|
|
|
if (!led_cdev->max_brightness)
|
|
led_cdev->max_brightness = LED_FULL;
|
|
|
|
led_update_brightness(led_cdev);
|
|
|
|
led_init_core(led_cdev);
|
|
|
|
#ifdef CONFIG_LEDS_TRIGGERS
|
|
/*
|
|
* If no default trigger was given and hw_control_trigger is set,
|
|
* make it the default trigger.
|
|
*/
|
|
if (!led_cdev->default_trigger && led_cdev->hw_control_trigger)
|
|
led_cdev->default_trigger = led_cdev->hw_control_trigger;
|
|
led_trigger_set_default(led_cdev);
|
|
#endif
|
|
|
|
mutex_unlock(&led_cdev->led_access);
|
|
|
|
dev_dbg(parent, "Registered led device: %s\n",
|
|
led_cdev->name);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(led_classdev_register_ext);
|
|
|
|
/**
|
|
* led_classdev_unregister - unregisters a object of led_properties class.
|
|
* @led_cdev: the led device to unregister
|
|
*
|
|
* Unregisters a previously registered via led_classdev_register object.
|
|
*/
|
|
void led_classdev_unregister(struct led_classdev *led_cdev)
|
|
{
|
|
if (IS_ERR_OR_NULL(led_cdev->dev))
|
|
return;
|
|
|
|
#ifdef CONFIG_LEDS_TRIGGERS
|
|
down_write(&led_cdev->trigger_lock);
|
|
if (led_cdev->trigger)
|
|
led_trigger_set(led_cdev, NULL);
|
|
up_write(&led_cdev->trigger_lock);
|
|
#endif
|
|
|
|
led_cdev->flags |= LED_UNREGISTERING;
|
|
|
|
/* Stop blinking */
|
|
led_stop_software_blink(led_cdev);
|
|
|
|
if (!(led_cdev->flags & LED_RETAIN_AT_SHUTDOWN))
|
|
led_set_brightness(led_cdev, LED_OFF);
|
|
|
|
flush_work(&led_cdev->set_brightness_work);
|
|
|
|
if (led_cdev->flags & LED_BRIGHT_HW_CHANGED)
|
|
led_remove_brightness_hw_changed(led_cdev);
|
|
|
|
device_unregister(led_cdev->dev);
|
|
|
|
down_write(&leds_list_lock);
|
|
list_del(&led_cdev->node);
|
|
up_write(&leds_list_lock);
|
|
|
|
mutex_destroy(&led_cdev->led_access);
|
|
}
|
|
EXPORT_SYMBOL_GPL(led_classdev_unregister);
|
|
|
|
static void devm_led_classdev_release(struct device *dev, void *res)
|
|
{
|
|
led_classdev_unregister(*(struct led_classdev **)res);
|
|
}
|
|
|
|
/**
|
|
* devm_led_classdev_register_ext - resource managed led_classdev_register_ext()
|
|
*
|
|
* @parent: parent of LED device
|
|
* @led_cdev: the led_classdev structure for this device.
|
|
* @init_data: LED class device initialization data
|
|
*/
|
|
int devm_led_classdev_register_ext(struct device *parent,
|
|
struct led_classdev *led_cdev,
|
|
struct led_init_data *init_data)
|
|
{
|
|
struct led_classdev **dr;
|
|
int rc;
|
|
|
|
dr = devres_alloc(devm_led_classdev_release, sizeof(*dr), GFP_KERNEL);
|
|
if (!dr)
|
|
return -ENOMEM;
|
|
|
|
rc = led_classdev_register_ext(parent, led_cdev, init_data);
|
|
if (rc) {
|
|
devres_free(dr);
|
|
return rc;
|
|
}
|
|
|
|
*dr = led_cdev;
|
|
devres_add(parent, dr);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_led_classdev_register_ext);
|
|
|
|
static int devm_led_classdev_match(struct device *dev, void *res, void *data)
|
|
{
|
|
struct led_classdev **p = res;
|
|
|
|
if (WARN_ON(!p || !*p))
|
|
return 0;
|
|
|
|
return *p == data;
|
|
}
|
|
|
|
/**
|
|
* devm_led_classdev_unregister() - resource managed led_classdev_unregister()
|
|
* @dev: The device to unregister.
|
|
* @led_cdev: the led_classdev structure for this device.
|
|
*/
|
|
void devm_led_classdev_unregister(struct device *dev,
|
|
struct led_classdev *led_cdev)
|
|
{
|
|
WARN_ON(devres_release(dev,
|
|
devm_led_classdev_release,
|
|
devm_led_classdev_match, led_cdev));
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_led_classdev_unregister);
|
|
|
|
static int __init leds_init(void)
|
|
{
|
|
return class_register(&leds_class);
|
|
}
|
|
|
|
static void __exit leds_exit(void)
|
|
{
|
|
class_unregister(&leds_class);
|
|
}
|
|
|
|
subsys_initcall(leds_init);
|
|
module_exit(leds_exit);
|
|
|
|
MODULE_AUTHOR("John Lenz, Richard Purdie");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("LED Class Interface");
|