tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 sprintf(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 sprintf(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 return sprintf(buf, "%lld\n", ktime_to_ms(total_time));
61}
62static DEVICE_ATTR_RO(total_time_ms);
63
64static ssize_t max_time_ms_show(struct device *dev,
65 struct device_attribute *attr, char *buf)
66{
67 struct wakeup_source *ws = dev_get_drvdata(dev);
68 ktime_t active_time;
69 ktime_t max_time = ws->max_time;
70
71 if (ws->active) {
72 active_time = ktime_sub(ktime_get(), ws->last_time);
73 if (active_time > max_time)
74 max_time = active_time;
75 }
76 return sprintf(buf, "%lld\n", ktime_to_ms(max_time));
77}
78static DEVICE_ATTR_RO(max_time_ms);
79
80static ssize_t last_change_ms_show(struct device *dev,
81 struct device_attribute *attr, char *buf)
82{
83 struct wakeup_source *ws = dev_get_drvdata(dev);
84
85 return sprintf(buf, "%lld\n", ktime_to_ms(ws->last_time));
86}
87static DEVICE_ATTR_RO(last_change_ms);
88
89static ssize_t name_show(struct device *dev, struct device_attribute *attr,
90 char *buf)
91{
92 struct wakeup_source *ws = dev_get_drvdata(dev);
93
94 return sprintf(buf, "%s\n", ws->name);
95}
96static DEVICE_ATTR_RO(name);
97
98static ssize_t prevent_suspend_time_ms_show(struct device *dev,
99 struct device_attribute *attr,
100 char *buf)
101{
102 struct wakeup_source *ws = dev_get_drvdata(dev);
103 ktime_t prevent_sleep_time = ws->prevent_sleep_time;
104
105 if (ws->active && ws->autosleep_enabled) {
106 prevent_sleep_time = ktime_add(prevent_sleep_time,
107 ktime_sub(ktime_get(), ws->start_prevent_time));
108 }
109 return sprintf(buf, "%lld\n", ktime_to_ms(prevent_sleep_time));
110}
111static DEVICE_ATTR_RO(prevent_suspend_time_ms);
112
113static struct attribute *wakeup_source_attrs[] = {
114 &dev_attr_name.attr,
115 &dev_attr_active_count.attr,
116 &dev_attr_event_count.attr,
117 &dev_attr_wakeup_count.attr,
118 &dev_attr_expire_count.attr,
119 &dev_attr_active_time_ms.attr,
120 &dev_attr_total_time_ms.attr,
121 &dev_attr_max_time_ms.attr,
122 &dev_attr_last_change_ms.attr,
123 &dev_attr_prevent_suspend_time_ms.attr,
124 NULL,
125};
126ATTRIBUTE_GROUPS(wakeup_source);
127
128static void device_create_release(struct device *dev)
129{
130 kfree(dev);
131}
132
133static struct device *wakeup_source_device_create(struct device *parent,
134 struct wakeup_source *ws)
135{
136 struct device *dev = NULL;
137 int retval = -ENODEV;
138
139 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
140 if (!dev) {
141 retval = -ENOMEM;
142 goto error;
143 }
144
145 device_initialize(dev);
146 dev->devt = MKDEV(0, 0);
147 dev->class = wakeup_class;
148 dev->parent = parent;
149 dev->groups = wakeup_source_groups;
150 dev->release = device_create_release;
151 dev_set_drvdata(dev, ws);
152 device_set_pm_not_required(dev);
153
154 retval = kobject_set_name(&dev->kobj, "wakeup%d", ws->id);
155 if (retval)
156 goto error;
157
158 retval = device_add(dev);
159 if (retval)
160 goto error;
161
162 return dev;
163
164error:
165 put_device(dev);
166 return ERR_PTR(retval);
167}
168
169/**
170 * wakeup_source_sysfs_add - Add wakeup_source attributes to sysfs.
171 * @parent: Device given wakeup source is associated with (or NULL if virtual).
172 * @ws: Wakeup source to be added in sysfs.
173 */
174int wakeup_source_sysfs_add(struct device *parent, struct wakeup_source *ws)
175{
176 struct device *dev;
177
178 dev = wakeup_source_device_create(parent, ws);
179 if (IS_ERR(dev))
180 return PTR_ERR(dev);
181 ws->dev = dev;
182
183 return 0;
184}
185
186/**
187 * pm_wakeup_source_sysfs_add - Add wakeup_source attributes to sysfs
188 * for a device if they're missing.
189 * @parent: Device given wakeup source is associated with
190 */
191int pm_wakeup_source_sysfs_add(struct device *parent)
192{
193 if (!parent->power.wakeup || parent->power.wakeup->dev)
194 return 0;
195
196 return wakeup_source_sysfs_add(parent, parent->power.wakeup);
197}
198
199/**
200 * wakeup_source_sysfs_remove - Remove wakeup_source attributes from sysfs.
201 * @ws: Wakeup source to be removed from sysfs.
202 */
203void wakeup_source_sysfs_remove(struct wakeup_source *ws)
204{
205 device_unregister(ws->dev);
206}
207
208static int __init wakeup_sources_sysfs_init(void)
209{
210 wakeup_class = class_create(THIS_MODULE, "wakeup");
211
212 return PTR_ERR_OR_ZERO(wakeup_class);
213}
214postcore_initcall(wakeup_sources_sysfs_init);