Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * LED Class Core
 *
 * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
 * Copyright (C) 2005-2007 Richard Purdie <rpurdie@openedhand.com>
 */
 
#include <linux/ctype.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/leds.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <uapi/linux/uleds.h>
#include <linux/of.h>
#include "leds.h"
 
static struct class *leds_class;
 
static ssize_t brightness_show(struct device *dev,
<------><------>struct device_attribute *attr, char *buf)
{
<------>struct led_classdev *led_cdev = dev_get_drvdata(dev);
 
<------>/* no lock needed for this */
<------>led_update_brightness(led_cdev);
 
<------>return sprintf(buf, "%u\n", led_cdev->brightness);
}
 
static ssize_t brightness_store(struct device *dev,
<------><------>struct device_attribute *attr, const char *buf, size_t size)
{
<------>struct led_classdev *led_cdev = dev_get_drvdata(dev);
<------>unsigned long state;
<------>ssize_t ret;
 
<------>mutex_lock(&led_cdev->led_access);
 
<------>if (led_sysfs_is_disabled(led_cdev)) {
<------><------>ret = -EBUSY;
<------><------>goto unlock;
<------>}
 
<------>ret = kstrtoul(buf, 10, &state);
<------>if (ret)
<------><------>goto unlock;
 
<------>if (state == LED_OFF)
<------><------>led_trigger_remove(led_cdev);
<------>led_set_brightness(led_cdev, state);
<------>flush_work(&led_cdev->set_brightness_work);
 
<------>ret = size;
unlock:
<------>mutex_unlock(&led_cdev->led_access);
<------>return ret;
}
static DEVICE_ATTR_RW(brightness);
 
static ssize_t max_brightness_show(struct device *dev,
<------><------>struct device_attribute *attr, char *buf)
{
<------>struct led_classdev *led_cdev = dev_get_drvdata(dev);
 
<------>return sprintf(buf, "%u\n", led_cdev->max_brightness);
}
static DEVICE_ATTR_RO(max_brightness);
 
#ifdef CONFIG_LEDS_TRIGGERS
static BIN_ATTR(trigger, 0644, led_trigger_read, led_trigger_write, 0);
static struct bin_attribute *led_trigger_bin_attrs[] = {
<------>&bin_attr_trigger,
<------>NULL,
};
static const struct attribute_group led_trigger_group = {
<------>.bin_attrs = led_trigger_bin_attrs,
};
#endif
 
static struct attribute *led_class_attrs[] = {
<------>&dev_attr_brightness.attr,
<------>&dev_attr_max_brightness.attr,
<------>NULL,
};
 
static const struct attribute_group led_group = {
<------>.attrs = led_class_attrs,
};
 
static const struct attribute_group *led_groups[] = {
<------>&led_group,
#ifdef CONFIG_LEDS_TRIGGERS
<------>&led_trigger_group,
#endif
<------>NULL,
};
 
#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
static ssize_t brightness_hw_changed_show(struct device *dev,
<------><------>struct device_attribute *attr, char *buf)
{
<------>struct led_classdev *led_cdev = dev_get_drvdata(dev);
 
<------>if (led_cdev->brightness_hw_changed == -1)
<------><------>return -ENODATA;
 
<------>return sprintf(buf, "%u\n", led_cdev->brightness_hw_changed);
}
 
static DEVICE_ATTR_RO(brightness_hw_changed);
 
static int led_add_brightness_hw_changed(struct led_classdev *led_cdev)
{
<------>struct device *dev = led_cdev->dev;
<------>int ret;
 
<------>ret = device_create_file(dev, &dev_attr_brightness_hw_changed);
<------>if (ret) {
<------><------>dev_err(dev, "Error creating brightness_hw_changed\n");
<------><------>return ret;
<------>}
 
<------>led_cdev->brightness_hw_changed_kn =
<------><------>sysfs_get_dirent(dev->kobj.sd, "brightness_hw_changed");
<------>if (!led_cdev->brightness_hw_changed_kn) {
<------><------>dev_err(dev, "Error getting brightness_hw_changed kn\n");
<------><------>device_remove_file(dev, &dev_attr_brightness_hw_changed);
<------><------>return -ENXIO;
<------>}
 
<------>return 0;
}
 
static void led_remove_brightness_hw_changed(struct led_classdev *led_cdev)
{
<------>sysfs_put(led_cdev->brightness_hw_changed_kn);
<------>device_remove_file(led_cdev->dev, &dev_attr_brightness_hw_changed);
}
 
void led_classdev_notify_brightness_hw_changed(struct led_classdev *led_cdev,
<------><------><------><------><------>       enum led_brightness brightness)
{
<------>if (WARN_ON(!led_cdev->brightness_hw_changed_kn))
<------><------>return;
 
<------>led_cdev->brightness_hw_changed = brightness;
<------>sysfs_notify_dirent(led_cdev->brightness_hw_changed_kn);
}
EXPORT_SYMBOL_GPL(led_classdev_notify_brightness_hw_changed);
#else
static int led_add_brightness_hw_changed(struct led_classdev *led_cdev)
{
<------>return 0;
}
static void led_remove_brightness_hw_changed(struct led_classdev *led_cdev)
{
}
#endif
 
/**
 * led_classdev_suspend - suspend an led_classdev.
 * @led_cdev: the led_classdev to suspend.
 */
void led_classdev_suspend(struct led_classdev *led_cdev)
{
<------>led_cdev->flags |= LED_SUSPENDED;
<------>led_set_brightness_nopm(led_cdev, 0);
<------>flush_work(&led_cdev->set_brightness_work);
}
EXPORT_SYMBOL_GPL(led_classdev_suspend);
 
/**
 * led_classdev_resume - resume an led_classdev.
 * @led_cdev: the led_classdev to resume.
 */
void led_classdev_resume(struct led_classdev *led_cdev)
{
<------>led_set_brightness_nopm(led_cdev, led_cdev->brightness);
 
<------>if (led_cdev->flash_resume)
<------><------>led_cdev->flash_resume(led_cdev);
 
<------>led_cdev->flags &= ~LED_SUSPENDED;
}
EXPORT_SYMBOL_GPL(led_classdev_resume);
 
#ifdef CONFIG_PM_SLEEP
static int led_suspend(struct device *dev)
{
<------>struct led_classdev *led_cdev = dev_get_drvdata(dev);
 
<------>if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
<------><------>led_classdev_suspend(led_cdev);
 
<------>return 0;
}
 
static int led_resume(struct device *dev)
{
<------>struct led_classdev *led_cdev = dev_get_drvdata(dev);
 
<------>if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
<------><------>led_classdev_resume(led_cdev);
 
<------>return 0;
}
#endif
 
static SIMPLE_DEV_PM_OPS(leds_class_dev_pm_ops, led_suspend, led_resume);
 
/**
 * of_led_get() - request a LED device via the LED framework
 * @np: device node to get the LED device from
 * @index: the index of the LED
 *
 * Returns the LED device parsed from the phandle specified in the "leds"
 * property of a device tree node or a negative error-code on failure.
 */
struct led_classdev *of_led_get(struct device_node *np, int index)
{
<------>struct device *led_dev;
<------>struct led_classdev *led_cdev;
<------>struct device_node *led_node;
 
<------>led_node = of_parse_phandle(np, "leds", index);
<------>if (!led_node)
<------><------>return ERR_PTR(-ENOENT);
 
<------>led_dev = class_find_device_by_of_node(leds_class, led_node);
<------>of_node_put(led_node);
 
<------>if (!led_dev)
<------><------>return ERR_PTR(-EPROBE_DEFER);
 
<------>led_cdev = dev_get_drvdata(led_dev);
 
<------>if (!try_module_get(led_cdev->dev->parent->driver->owner))
<------><------>return ERR_PTR(-ENODEV);
 
<------>return led_cdev;
}
EXPORT_SYMBOL_GPL(of_led_get);
 
/**
 * led_put() - release a LED device
 * @led_cdev: LED device
 */
void led_put(struct led_classdev *led_cdev)
{
<------>module_put(led_cdev->dev->parent->driver->owner);
}
EXPORT_SYMBOL_GPL(led_put);
 
static void devm_led_release(struct device *dev, void *res)
{
<------>struct led_classdev **p = res;
 
<------>led_put(*p);
}
 
/**
 * devm_of_led_get - Resource-managed request of a LED device
 * @dev:	LED consumer
 * @index:	index of the LED to obtain in the consumer
 *
 * The device node of the device is parse to find the request LED device.
 * The LED device returned from this function is automatically released
 * on driver detach.
 *
 * @return a pointer to a LED device or ERR_PTR(errno) on failure.
 */
struct led_classdev *__must_check devm_of_led_get(struct device *dev,
<------><------><------><------><------><------>  int index)
{
<------>struct led_classdev *led;
<------>struct led_classdev **dr;
 
<------>if (!dev)
<------><------>return ERR_PTR(-EINVAL);
 
<------>led = of_led_get(dev->of_node, index);
<------>if (IS_ERR(led))
<------><------>return led;
 
<------>dr = devres_alloc(devm_led_release, sizeof(struct led_classdev *),
<------><------><------>  GFP_KERNEL);
<------>if (!dr) {
<------><------>led_put(led);
<------><------>return ERR_PTR(-ENOMEM);
<------>}
 
<------>*dr = led;
<------>devres_add(dev, dr);
 
<------>return led;
}
EXPORT_SYMBOL_GPL(devm_of_led_get);
 
static int led_classdev_next_name(const char *init_name, char *name,
<------><------><------><------>  size_t len)
{
<------>unsigned int i = 0;
<------>int ret = 0;
<------>struct device *dev;
 
<------>strlcpy(name, init_name, len);
 
<------>while ((ret < len) &&
<------>       (dev = class_find_device_by_name(leds_class, name))) {
<------><------>put_device(dev);
<------><------>ret = snprintf(name, len, "%s_%u", init_name, ++i);
<------>}
 
<------>if (ret >= len)
<------><------>return -ENOMEM;
 
<------>return i;
}
 
/**
 * led_classdev_register_ext - register a new object of led_classdev class
 *			       with init data.
 *
 * @parent: parent of LED device
 * @led_cdev: the led_classdev structure for this device.
 * @init_data: LED class device initialization data
 */
int led_classdev_register_ext(struct device *parent,
<------><------><------>      struct led_classdev *led_cdev,
<------><------><------>      struct led_init_data *init_data)
{
<------>char composed_name[LED_MAX_NAME_SIZE];
<------>char final_name[LED_MAX_NAME_SIZE];
<------>const char *proposed_name = composed_name;
<------>int ret;
 
<------>if (init_data) {
<------><------>if (init_data->devname_mandatory && !init_data->devicename) {
<------><------><------>dev_err(parent, "Mandatory device name is missing");
<------><------><------>return -EINVAL;
<------><------>}
<------><------>ret = led_compose_name(parent, init_data, composed_name);
<------><------>if (ret < 0)
<------><------><------>return ret;
 
<------><------>if (init_data->fwnode)
<------><------><------>fwnode_property_read_string(init_data->fwnode,
<------><------><------><------>"linux,default-trigger",
<------><------><------><------>&led_cdev->default_trigger);
<------>} else {
<------><------>proposed_name = led_cdev->name;
<------>}
 
<------>ret = led_classdev_next_name(proposed_name, final_name, sizeof(final_name));
<------>if (ret < 0)
<------><------>return ret;
 
<------>mutex_init(&led_cdev->led_access);
<------>mutex_lock(&led_cdev->led_access);
<------>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) {
<------><------>led_cdev->dev->fwnode = init_data->fwnode;
<------><------>led_cdev->dev->of_node = to_of_node(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
<------>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);
 
<------>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()
 * @parent: 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)
{
<------>leds_class = class_create(THIS_MODULE, "leds");
<------>if (IS_ERR(leds_class))
<------><------>return PTR_ERR(leds_class);
<------>leds_class->pm = &leds_class_dev_pm_ops;
<------>leds_class->dev_groups = led_groups;
<------>return 0;
}
 
static void __exit leds_exit(void)
{
<------>class_destroy(leds_class);
}
 
subsys_initcall(leds_init);
module_exit(leds_exit);
 
MODULE_AUTHOR("John Lenz, Richard Purdie");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("LED Class Interface");