This source file includes following definitions.
- active_time_ms_show
- total_time_ms_show
- max_time_ms_show
- last_change_ms_show
- name_show
- prevent_suspend_time_ms_show
- device_create_release
- wakeup_source_device_create
- wakeup_source_sysfs_add
- pm_wakeup_source_sysfs_add
- wakeup_source_sysfs_remove
- wakeup_sources_sysfs_init
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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 sprintf(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
38 static 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 }
47 static DEVICE_ATTR_RO(active_time_ms);
48
49 static 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 }
62 static DEVICE_ATTR_RO(total_time_ms);
63
64 static 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 }
78 static DEVICE_ATTR_RO(max_time_ms);
79
80 static 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 }
87 static DEVICE_ATTR_RO(last_change_ms);
88
89 static 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 }
96 static DEVICE_ATTR_RO(name);
97
98 static 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 }
111 static DEVICE_ATTR_RO(prevent_suspend_time_ms);
112
113 static 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 };
126 ATTRIBUTE_GROUPS(wakeup_source);
127
128 static void device_create_release(struct device *dev)
129 {
130 kfree(dev);
131 }
132
133 static 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
164 error:
165 put_device(dev);
166 return ERR_PTR(retval);
167 }
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173
174 int 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 }
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190
191 int 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 }
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201
202
203 void wakeup_source_sysfs_remove(struct wakeup_source *ws)
204 {
205 device_unregister(ws->dev);
206 }
207
208 static 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 }
214 postcore_initcall(wakeup_sources_sysfs_init);