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// SPDX-License-Identifier: GPL-2.0
/*
* Wakeup statistics in sysfs
*
* Copyright (c) 2019 Linux Foundation
* Copyright (c) 2019 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Copyright (c) 2019 Google Inc.
*/
#include <linux/device.h>
#include <linux/idr.h>
#include <linux/init.h>
#include <linux/kdev_t.h>
#include <linux/kernel.h>
#include <linux/kobject.h>
#include <linux/slab.h>
#include <linux/timekeeping.h>
#include "power.h"
static struct class *wakeup_class;
#define wakeup_attr(_name) \
static ssize_t _name##_show(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct wakeup_source *ws = dev_get_drvdata(dev); \
\
return sysfs_emit(buf, "%lu\n", ws->_name); \
} \
static DEVICE_ATTR_RO(_name)
wakeup_attr(active_count);
wakeup_attr(event_count);
wakeup_attr(wakeup_count);
wakeup_attr(expire_count);
static ssize_t active_time_ms_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct wakeup_source *ws = dev_get_drvdata(dev);
ktime_t active_time =
ws->active ? ktime_sub(ktime_get(), ws->last_time) : 0;
return sysfs_emit(buf, "%lld\n", ktime_to_ms(active_time));
}
static DEVICE_ATTR_RO(active_time_ms);
static ssize_t total_time_ms_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct wakeup_source *ws = dev_get_drvdata(dev);
ktime_t active_time;
ktime_t total_time = ws->total_time;
if (ws->active) {
active_time = ktime_sub(ktime_get(), ws->last_time);
total_time = ktime_add(total_time, active_time);
}
return sysfs_emit(buf, "%lld\n", ktime_to_ms(total_time));
}
static DEVICE_ATTR_RO(total_time_ms);
static ssize_t max_time_ms_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct wakeup_source *ws = dev_get_drvdata(dev);
ktime_t active_time;
ktime_t max_time = ws->max_time;
if (ws->active) {
active_time = ktime_sub(ktime_get(), ws->last_time);
if (active_time > max_time)
max_time = active_time;
}
return sysfs_emit(buf, "%lld\n", ktime_to_ms(max_time));
}
static DEVICE_ATTR_RO(max_time_ms);
static ssize_t last_change_ms_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct wakeup_source *ws = dev_get_drvdata(dev);
return sysfs_emit(buf, "%lld\n", ktime_to_ms(ws->last_time));
}
static DEVICE_ATTR_RO(last_change_ms);
static ssize_t name_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct wakeup_source *ws = dev_get_drvdata(dev);
return sysfs_emit(buf, "%s\n", ws->name);
}
static DEVICE_ATTR_RO(name);
static ssize_t prevent_suspend_time_ms_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct wakeup_source *ws = dev_get_drvdata(dev);
ktime_t prevent_sleep_time = ws->prevent_sleep_time;
if (ws->active && ws->autosleep_enabled) {
prevent_sleep_time = ktime_add(prevent_sleep_time,
ktime_sub(ktime_get(), ws->start_prevent_time));
}
return sysfs_emit(buf, "%lld\n", ktime_to_ms(prevent_sleep_time));
}
static DEVICE_ATTR_RO(prevent_suspend_time_ms);
static struct attribute *wakeup_source_attrs[] = {
&dev_attr_name.attr,
&dev_attr_active_count.attr,
&dev_attr_event_count.attr,
&dev_attr_wakeup_count.attr,
&dev_attr_expire_count.attr,
&dev_attr_active_time_ms.attr,
&dev_attr_total_time_ms.attr,
&dev_attr_max_time_ms.attr,
&dev_attr_last_change_ms.attr,
&dev_attr_prevent_suspend_time_ms.attr,
NULL,
};
ATTRIBUTE_GROUPS(wakeup_source);
static void device_create_release(struct device *dev)
{
kfree(dev);
}
static struct device *wakeup_source_device_create(struct device *parent,
struct wakeup_source *ws)
{
struct device *dev = NULL;
int retval = -ENODEV;
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev) {
retval = -ENOMEM;
goto error;
}
device_initialize(dev);
dev->devt = MKDEV(0, 0);
dev->class = wakeup_class;
dev->parent = parent;
dev->groups = wakeup_source_groups;
dev->release = device_create_release;
dev_set_drvdata(dev, ws);
device_set_pm_not_required(dev);
retval = kobject_set_name(&dev->kobj, "wakeup%d", ws->id);
if (retval)
goto error;
retval = device_add(dev);
if (retval)
goto error;
return dev;
error:
put_device(dev);
return ERR_PTR(retval);
}
/**
* wakeup_source_sysfs_add - Add wakeup_source attributes to sysfs.
* @parent: Device given wakeup source is associated with (or NULL if virtual).
* @ws: Wakeup source to be added in sysfs.
*/
int wakeup_source_sysfs_add(struct device *parent, struct wakeup_source *ws)
{
struct device *dev;
dev = wakeup_source_device_create(parent, ws);
if (IS_ERR(dev))
return PTR_ERR(dev);
ws->dev = dev;
return 0;
}
/**
* pm_wakeup_source_sysfs_add - Add wakeup_source attributes to sysfs
* for a device if they're missing.
* @parent: Device given wakeup source is associated with
*/
int pm_wakeup_source_sysfs_add(struct device *parent)
{
if (!parent->power.wakeup || parent->power.wakeup->dev)
return 0;
return wakeup_source_sysfs_add(parent, parent->power.wakeup);
}
/**
* wakeup_source_sysfs_remove - Remove wakeup_source attributes from sysfs.
* @ws: Wakeup source to be removed from sysfs.
*/
void wakeup_source_sysfs_remove(struct wakeup_source *ws)
{
device_unregister(ws->dev);
}
static int __init wakeup_sources_sysfs_init(void)
{
wakeup_class = class_create(THIS_MODULE, "wakeup");
return PTR_ERR_OR_ZERO(wakeup_class);
}
postcore_initcall(wakeup_sources_sysfs_init);
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