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
21 static struct class *wakeup_class;
22
23 #define wakeup_attr(_name) \
24 static 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 } \
31 static DEVICE_ATTR_RO(_name)
32
33 wakeup_attr(active_count);
34 wakeup_attr(event_count);
35 wakeup_attr(wakeup_count);
36 wakeup_attr(expire_count);
37 wakeup_attr(relax_count);
38
active_time_ms_show(struct device * dev,struct device_attribute * attr,char * buf)39 static ssize_t active_time_ms_show(struct device *dev,
40 struct device_attribute *attr, char *buf)
41 {
42 struct wakeup_source *ws = dev_get_drvdata(dev);
43 ktime_t active_time =
44 ws->active ? ktime_sub(ktime_get(), ws->last_time) : 0;
45
46 return sysfs_emit(buf, "%lld\n", ktime_to_ms(active_time));
47 }
48 static DEVICE_ATTR_RO(active_time_ms);
49
total_time_ms_show(struct device * dev,struct device_attribute * attr,char * buf)50 static ssize_t total_time_ms_show(struct device *dev,
51 struct device_attribute *attr, char *buf)
52 {
53 struct wakeup_source *ws = dev_get_drvdata(dev);
54 ktime_t active_time;
55 ktime_t total_time = ws->total_time;
56
57 if (ws->active) {
58 active_time = ktime_sub(ktime_get(), ws->last_time);
59 total_time = ktime_add(total_time, active_time);
60 }
61
62 return sysfs_emit(buf, "%lld\n", ktime_to_ms(total_time));
63 }
64 static DEVICE_ATTR_RO(total_time_ms);
65
max_time_ms_show(struct device * dev,struct device_attribute * attr,char * buf)66 static ssize_t max_time_ms_show(struct device *dev,
67 struct device_attribute *attr, char *buf)
68 {
69 struct wakeup_source *ws = dev_get_drvdata(dev);
70 ktime_t active_time;
71 ktime_t max_time = ws->max_time;
72
73 if (ws->active) {
74 active_time = ktime_sub(ktime_get(), ws->last_time);
75 if (active_time > max_time)
76 max_time = active_time;
77 }
78
79 return sysfs_emit(buf, "%lld\n", ktime_to_ms(max_time));
80 }
81 static DEVICE_ATTR_RO(max_time_ms);
82
last_change_ms_show(struct device * dev,struct device_attribute * attr,char * buf)83 static ssize_t last_change_ms_show(struct device *dev,
84 struct device_attribute *attr, char *buf)
85 {
86 struct wakeup_source *ws = dev_get_drvdata(dev);
87
88 return sysfs_emit(buf, "%lld\n", ktime_to_ms(ws->last_time));
89 }
90 static DEVICE_ATTR_RO(last_change_ms);
91
name_show(struct device * dev,struct device_attribute * attr,char * buf)92 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
93 char *buf)
94 {
95 struct wakeup_source *ws = dev_get_drvdata(dev);
96
97 return sysfs_emit(buf, "%s\n", ws->name);
98 }
99 static DEVICE_ATTR_RO(name);
100
prevent_suspend_time_ms_show(struct device * dev,struct device_attribute * attr,char * buf)101 static ssize_t prevent_suspend_time_ms_show(struct device *dev,
102 struct device_attribute *attr,
103 char *buf)
104 {
105 struct wakeup_source *ws = dev_get_drvdata(dev);
106 ktime_t prevent_sleep_time = ws->prevent_sleep_time;
107
108 if (ws->active && ws->autosleep_enabled) {
109 prevent_sleep_time = ktime_add(prevent_sleep_time,
110 ktime_sub(ktime_get(), ws->start_prevent_time));
111 }
112
113 return sysfs_emit(buf, "%lld\n", ktime_to_ms(prevent_sleep_time));
114 }
115 static DEVICE_ATTR_RO(prevent_suspend_time_ms);
116
117 static struct attribute *wakeup_source_attrs[] = {
118 &dev_attr_name.attr,
119 &dev_attr_active_count.attr,
120 &dev_attr_event_count.attr,
121 &dev_attr_wakeup_count.attr,
122 &dev_attr_expire_count.attr,
123 &dev_attr_relax_count.attr,
124 &dev_attr_active_time_ms.attr,
125 &dev_attr_total_time_ms.attr,
126 &dev_attr_max_time_ms.attr,
127 &dev_attr_last_change_ms.attr,
128 &dev_attr_prevent_suspend_time_ms.attr,
129 NULL,
130 };
131 ATTRIBUTE_GROUPS(wakeup_source);
132
device_create_release(struct device * dev)133 static void device_create_release(struct device *dev)
134 {
135 kfree(dev);
136 }
137
wakeup_source_device_create(struct device * parent,struct wakeup_source * ws)138 static struct device *wakeup_source_device_create(struct device *parent,
139 struct wakeup_source *ws)
140 {
141 struct device *dev = NULL;
142 int retval;
143
144 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
145 if (!dev) {
146 retval = -ENOMEM;
147 goto error;
148 }
149
150 device_initialize(dev);
151 dev->devt = MKDEV(0, 0);
152 dev->class = wakeup_class;
153 dev->parent = parent;
154 dev->groups = wakeup_source_groups;
155 dev->release = device_create_release;
156 dev_set_drvdata(dev, ws);
157 device_set_pm_not_required(dev);
158
159 retval = dev_set_name(dev, "wakeup%d", ws->id);
160 if (retval)
161 goto error;
162
163 retval = device_add(dev);
164 if (retval)
165 goto error;
166
167 return dev;
168
169 error:
170 put_device(dev);
171 return ERR_PTR(retval);
172 }
173
174 /**
175 * wakeup_source_sysfs_add - Add wakeup_source attributes to sysfs.
176 * @parent: Device given wakeup source is associated with (or NULL if virtual).
177 * @ws: Wakeup source to be added in sysfs.
178 */
wakeup_source_sysfs_add(struct device * parent,struct wakeup_source * ws)179 int wakeup_source_sysfs_add(struct device *parent, struct wakeup_source *ws)
180 {
181 struct device *dev;
182
183 dev = wakeup_source_device_create(parent, ws);
184 if (IS_ERR(dev))
185 return PTR_ERR(dev);
186 ws->dev = dev;
187
188 return 0;
189 }
190
191 /**
192 * pm_wakeup_source_sysfs_add - Add wakeup_source attributes to sysfs
193 * for a device if they're missing.
194 * @parent: Device given wakeup source is associated with
195 */
pm_wakeup_source_sysfs_add(struct device * parent)196 int pm_wakeup_source_sysfs_add(struct device *parent)
197 {
198 if (!parent->power.wakeup || parent->power.wakeup->dev)
199 return 0;
200
201 return wakeup_source_sysfs_add(parent, parent->power.wakeup);
202 }
203
204 /**
205 * wakeup_source_sysfs_remove - Remove wakeup_source attributes from sysfs.
206 * @ws: Wakeup source to be removed from sysfs.
207 */
wakeup_source_sysfs_remove(struct wakeup_source * ws)208 void wakeup_source_sysfs_remove(struct wakeup_source *ws)
209 {
210 device_unregister(ws->dev);
211 }
212
wakeup_sources_sysfs_init(void)213 static int __init wakeup_sources_sysfs_init(void)
214 {
215 wakeup_class = class_create("wakeup");
216
217 return PTR_ERR_OR_ZERO(wakeup_class);
218 }
219 postcore_initcall(wakeup_sources_sysfs_init);
220