1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Wakeup statistics in sysfs
4 *
5 * Copyright (c) 2019 Linux Foundation
6 * Copyright (c) 2019 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 * Copyright (c) 2019 Google Inc.
8 */
9
10#include <linux/device.h>
11#include <linux/idr.h>
12#include <linux/init.h>
13#include <linux/kdev_t.h>
14#include <linux/kernel.h>
15#include <linux/kobject.h>
16#include <linux/slab.h>
17#include <linux/timekeeping.h>
18
19#include "power.h"
20
21static struct class *wakeup_class;
22
23#define wakeup_attr(_name)						\
24static ssize_t _name##_show(struct device *dev,				\
25			    struct device_attribute *attr, char *buf)	\
26{									\
27	struct wakeup_source *ws = dev_get_drvdata(dev);		\
28									\
29	return sysfs_emit(buf, "%lu\n", ws->_name);			\
30}									\
31static DEVICE_ATTR_RO(_name)
32
33wakeup_attr(active_count);
34wakeup_attr(event_count);
35wakeup_attr(wakeup_count);
36wakeup_attr(expire_count);
37
38static ssize_t active_time_ms_show(struct device *dev,
39				   struct device_attribute *attr, char *buf)
40{
41	struct wakeup_source *ws = dev_get_drvdata(dev);
42	ktime_t active_time =
43		ws->active ? ktime_sub(ktime_get(), ws->last_time) : 0;
44
45	return sysfs_emit(buf, "%lld\n", ktime_to_ms(active_time));
46}
47static DEVICE_ATTR_RO(active_time_ms);
48
49static ssize_t total_time_ms_show(struct device *dev,
50				  struct device_attribute *attr, char *buf)
51{
52	struct wakeup_source *ws = dev_get_drvdata(dev);
53	ktime_t active_time;
54	ktime_t total_time = ws->total_time;
55
56	if (ws->active) {
57		active_time = ktime_sub(ktime_get(), ws->last_time);
58		total_time = ktime_add(total_time, active_time);
59	}
60
61	return sysfs_emit(buf, "%lld\n", ktime_to_ms(total_time));
62}
63static DEVICE_ATTR_RO(total_time_ms);
64
65static ssize_t max_time_ms_show(struct device *dev,
66				struct device_attribute *attr, char *buf)
67{
68	struct wakeup_source *ws = dev_get_drvdata(dev);
69	ktime_t active_time;
70	ktime_t max_time = ws->max_time;
71
72	if (ws->active) {
73		active_time = ktime_sub(ktime_get(), ws->last_time);
74		if (active_time > max_time)
75			max_time = active_time;
76	}
77
78	return sysfs_emit(buf, "%lld\n", ktime_to_ms(max_time));
79}
80static DEVICE_ATTR_RO(max_time_ms);
81
82static ssize_t last_change_ms_show(struct device *dev,
83				   struct device_attribute *attr, char *buf)
84{
85	struct wakeup_source *ws = dev_get_drvdata(dev);
86
87	return sysfs_emit(buf, "%lld\n", ktime_to_ms(ws->last_time));
88}
89static DEVICE_ATTR_RO(last_change_ms);
90
91static ssize_t name_show(struct device *dev, struct device_attribute *attr,
92			 char *buf)
93{
94	struct wakeup_source *ws = dev_get_drvdata(dev);
95
96	return sysfs_emit(buf, "%s\n", ws->name);
97}
98static DEVICE_ATTR_RO(name);
99
100static ssize_t prevent_suspend_time_ms_show(struct device *dev,
101					    struct device_attribute *attr,
102					    char *buf)
103{
104	struct wakeup_source *ws = dev_get_drvdata(dev);
105	ktime_t prevent_sleep_time = ws->prevent_sleep_time;
106
107	if (ws->active && ws->autosleep_enabled) {
108		prevent_sleep_time = ktime_add(prevent_sleep_time,
109			ktime_sub(ktime_get(), ws->start_prevent_time));
110	}
111
112	return sysfs_emit(buf, "%lld\n", ktime_to_ms(prevent_sleep_time));
113}
114static DEVICE_ATTR_RO(prevent_suspend_time_ms);
115
116static struct attribute *wakeup_source_attrs[] = {
117	&dev_attr_name.attr,
118	&dev_attr_active_count.attr,
119	&dev_attr_event_count.attr,
120	&dev_attr_wakeup_count.attr,
121	&dev_attr_expire_count.attr,
122	&dev_attr_active_time_ms.attr,
123	&dev_attr_total_time_ms.attr,
124	&dev_attr_max_time_ms.attr,
125	&dev_attr_last_change_ms.attr,
126	&dev_attr_prevent_suspend_time_ms.attr,
127	NULL,
128};
129ATTRIBUTE_GROUPS(wakeup_source);
130
131static void device_create_release(struct device *dev)
132{
133	kfree(dev);
134}
135
136static struct device *wakeup_source_device_create(struct device *parent,
137						  struct wakeup_source *ws)
138{
139	struct device *dev = NULL;
140	int retval;
141
142	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
143	if (!dev) {
144		retval = -ENOMEM;
145		goto error;
146	}
147
148	device_initialize(dev);
149	dev->devt = MKDEV(0, 0);
150	dev->class = wakeup_class;
151	dev->parent = parent;
152	dev->groups = wakeup_source_groups;
153	dev->release = device_create_release;
154	dev_set_drvdata(dev, ws);
155	device_set_pm_not_required(dev);
156
157	retval = dev_set_name(dev, "wakeup%d", ws->id);
158	if (retval)
159		goto error;
160
161	retval = device_add(dev);
162	if (retval)
163		goto error;
164
165	return dev;
166
167error:
168	put_device(dev);
169	return ERR_PTR(retval);
170}
171
172/**
173 * wakeup_source_sysfs_add - Add wakeup_source attributes to sysfs.
174 * @parent: Device given wakeup source is associated with (or NULL if virtual).
175 * @ws: Wakeup source to be added in sysfs.
176 */
177int wakeup_source_sysfs_add(struct device *parent, struct wakeup_source *ws)
178{
179	struct device *dev;
180
181	dev = wakeup_source_device_create(parent, ws);
182	if (IS_ERR(dev))
183		return PTR_ERR(dev);
184	ws->dev = dev;
185
186	return 0;
187}
188
189/**
190 * pm_wakeup_source_sysfs_add - Add wakeup_source attributes to sysfs
191 * for a device if they're missing.
192 * @parent: Device given wakeup source is associated with
193 */
194int pm_wakeup_source_sysfs_add(struct device *parent)
195{
196	if (!parent->power.wakeup || parent->power.wakeup->dev)
197		return 0;
198
199	return wakeup_source_sysfs_add(parent, parent->power.wakeup);
200}
201
202/**
203 * wakeup_source_sysfs_remove - Remove wakeup_source attributes from sysfs.
204 * @ws: Wakeup source to be removed from sysfs.
205 */
206void wakeup_source_sysfs_remove(struct wakeup_source *ws)
207{
208	device_unregister(ws->dev);
209}
210
211static int __init wakeup_sources_sysfs_init(void)
212{
213	wakeup_class = class_create("wakeup");
214
215	return PTR_ERR_OR_ZERO(wakeup_class);
216}
217postcore_initcall(wakeup_sources_sysfs_init);
218