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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
The module pointer in class_create() never actually did anything, and it shouldn't have been requred to be set as a parameter even if it did something. So just remove it and fix up all callers of the function in the kernel tree at the same time. Cc: "Rafael J. Wysocki" <rafael@kernel.org> Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Link: https://lore.kernel.org/r/20230313181843.1207845-4-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
217 lines
5.3 KiB
C
217 lines
5.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Wakeup statistics in sysfs
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*
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* Copyright (c) 2019 Linux Foundation
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* Copyright (c) 2019 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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* Copyright (c) 2019 Google Inc.
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*/
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#include <linux/device.h>
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#include <linux/idr.h>
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#include <linux/init.h>
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#include <linux/kdev_t.h>
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#include <linux/kernel.h>
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#include <linux/kobject.h>
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#include <linux/slab.h>
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#include <linux/timekeeping.h>
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#include "power.h"
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static struct class *wakeup_class;
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#define wakeup_attr(_name) \
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static ssize_t _name##_show(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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struct wakeup_source *ws = dev_get_drvdata(dev); \
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\
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return sysfs_emit(buf, "%lu\n", ws->_name); \
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} \
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static DEVICE_ATTR_RO(_name)
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wakeup_attr(active_count);
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wakeup_attr(event_count);
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wakeup_attr(wakeup_count);
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wakeup_attr(expire_count);
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static ssize_t active_time_ms_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct wakeup_source *ws = dev_get_drvdata(dev);
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ktime_t active_time =
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ws->active ? ktime_sub(ktime_get(), ws->last_time) : 0;
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return sysfs_emit(buf, "%lld\n", ktime_to_ms(active_time));
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}
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static DEVICE_ATTR_RO(active_time_ms);
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static ssize_t total_time_ms_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct wakeup_source *ws = dev_get_drvdata(dev);
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ktime_t active_time;
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ktime_t total_time = ws->total_time;
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if (ws->active) {
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active_time = ktime_sub(ktime_get(), ws->last_time);
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total_time = ktime_add(total_time, active_time);
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}
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return sysfs_emit(buf, "%lld\n", ktime_to_ms(total_time));
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}
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static DEVICE_ATTR_RO(total_time_ms);
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static ssize_t max_time_ms_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct wakeup_source *ws = dev_get_drvdata(dev);
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ktime_t active_time;
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ktime_t max_time = ws->max_time;
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if (ws->active) {
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active_time = ktime_sub(ktime_get(), ws->last_time);
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if (active_time > max_time)
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max_time = active_time;
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}
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return sysfs_emit(buf, "%lld\n", ktime_to_ms(max_time));
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}
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static DEVICE_ATTR_RO(max_time_ms);
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static ssize_t last_change_ms_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct wakeup_source *ws = dev_get_drvdata(dev);
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return sysfs_emit(buf, "%lld\n", ktime_to_ms(ws->last_time));
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}
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static DEVICE_ATTR_RO(last_change_ms);
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static ssize_t name_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct wakeup_source *ws = dev_get_drvdata(dev);
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return sysfs_emit(buf, "%s\n", ws->name);
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}
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static DEVICE_ATTR_RO(name);
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static ssize_t prevent_suspend_time_ms_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct wakeup_source *ws = dev_get_drvdata(dev);
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ktime_t prevent_sleep_time = ws->prevent_sleep_time;
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if (ws->active && ws->autosleep_enabled) {
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prevent_sleep_time = ktime_add(prevent_sleep_time,
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ktime_sub(ktime_get(), ws->start_prevent_time));
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}
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return sysfs_emit(buf, "%lld\n", ktime_to_ms(prevent_sleep_time));
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}
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static DEVICE_ATTR_RO(prevent_suspend_time_ms);
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static struct attribute *wakeup_source_attrs[] = {
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&dev_attr_name.attr,
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&dev_attr_active_count.attr,
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&dev_attr_event_count.attr,
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&dev_attr_wakeup_count.attr,
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&dev_attr_expire_count.attr,
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&dev_attr_active_time_ms.attr,
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&dev_attr_total_time_ms.attr,
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&dev_attr_max_time_ms.attr,
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&dev_attr_last_change_ms.attr,
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&dev_attr_prevent_suspend_time_ms.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(wakeup_source);
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static void device_create_release(struct device *dev)
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{
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kfree(dev);
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}
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static struct device *wakeup_source_device_create(struct device *parent,
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struct wakeup_source *ws)
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{
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struct device *dev = NULL;
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int retval;
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev) {
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retval = -ENOMEM;
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goto error;
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}
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device_initialize(dev);
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dev->devt = MKDEV(0, 0);
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dev->class = wakeup_class;
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dev->parent = parent;
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dev->groups = wakeup_source_groups;
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dev->release = device_create_release;
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dev_set_drvdata(dev, ws);
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device_set_pm_not_required(dev);
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retval = dev_set_name(dev, "wakeup%d", ws->id);
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if (retval)
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goto error;
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retval = device_add(dev);
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if (retval)
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goto error;
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return dev;
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error:
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put_device(dev);
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return ERR_PTR(retval);
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}
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/**
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* wakeup_source_sysfs_add - Add wakeup_source attributes to sysfs.
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* @parent: Device given wakeup source is associated with (or NULL if virtual).
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* @ws: Wakeup source to be added in sysfs.
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*/
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int wakeup_source_sysfs_add(struct device *parent, struct wakeup_source *ws)
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{
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struct device *dev;
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dev = wakeup_source_device_create(parent, ws);
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if (IS_ERR(dev))
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return PTR_ERR(dev);
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ws->dev = dev;
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return 0;
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}
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/**
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* pm_wakeup_source_sysfs_add - Add wakeup_source attributes to sysfs
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* for a device if they're missing.
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* @parent: Device given wakeup source is associated with
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*/
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int pm_wakeup_source_sysfs_add(struct device *parent)
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{
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if (!parent->power.wakeup || parent->power.wakeup->dev)
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return 0;
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return wakeup_source_sysfs_add(parent, parent->power.wakeup);
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}
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/**
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* wakeup_source_sysfs_remove - Remove wakeup_source attributes from sysfs.
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* @ws: Wakeup source to be removed from sysfs.
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*/
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void wakeup_source_sysfs_remove(struct wakeup_source *ws)
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{
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device_unregister(ws->dev);
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}
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static int __init wakeup_sources_sysfs_init(void)
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{
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wakeup_class = class_create("wakeup");
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return PTR_ERR_OR_ZERO(wakeup_class);
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}
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postcore_initcall(wakeup_sources_sysfs_init);
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