1
2
3
4
5
6
7
8
9
10
11#include <linux/kobject.h>
12#include <linux/string.h>
13#include <linux/resume-trace.h>
14#include <linux/workqueue.h>
15
16#include "power.h"
17
18DEFINE_MUTEX(pm_mutex);
19
20unsigned int pm_flags;
21EXPORT_SYMBOL(pm_flags);
22
23#ifdef CONFIG_PM_SLEEP
24
25
26
27static BLOCKING_NOTIFIER_HEAD(pm_chain_head);
28
29int register_pm_notifier(struct notifier_block *nb)
30{
31 return blocking_notifier_chain_register(&pm_chain_head, nb);
32}
33EXPORT_SYMBOL_GPL(register_pm_notifier);
34
35int unregister_pm_notifier(struct notifier_block *nb)
36{
37 return blocking_notifier_chain_unregister(&pm_chain_head, nb);
38}
39EXPORT_SYMBOL_GPL(unregister_pm_notifier);
40
41int pm_notifier_call_chain(unsigned long val)
42{
43 return (blocking_notifier_call_chain(&pm_chain_head, val, NULL)
44 == NOTIFY_BAD) ? -EINVAL : 0;
45}
46
47#ifdef CONFIG_PM_DEBUG
48int pm_test_level = TEST_NONE;
49
50static const char * const pm_tests[__TEST_AFTER_LAST] = {
51 [TEST_NONE] = "none",
52 [TEST_CORE] = "core",
53 [TEST_CPUS] = "processors",
54 [TEST_PLATFORM] = "platform",
55 [TEST_DEVICES] = "devices",
56 [TEST_FREEZER] = "freezer",
57};
58
59static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr,
60 char *buf)
61{
62 char *s = buf;
63 int level;
64
65 for (level = TEST_FIRST; level <= TEST_MAX; level++)
66 if (pm_tests[level]) {
67 if (level == pm_test_level)
68 s += sprintf(s, "[%s] ", pm_tests[level]);
69 else
70 s += sprintf(s, "%s ", pm_tests[level]);
71 }
72
73 if (s != buf)
74
75 *(s-1) = '\n';
76
77 return (s - buf);
78}
79
80static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
81 const char *buf, size_t n)
82{
83 const char * const *s;
84 int level;
85 char *p;
86 int len;
87 int error = -EINVAL;
88
89 p = memchr(buf, '\n', n);
90 len = p ? p - buf : n;
91
92 mutex_lock(&pm_mutex);
93
94 level = TEST_FIRST;
95 for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++)
96 if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) {
97 pm_test_level = level;
98 error = 0;
99 break;
100 }
101
102 mutex_unlock(&pm_mutex);
103
104 return error ? error : n;
105}
106
107power_attr(pm_test);
108#endif
109
110#endif
111
112struct kobject *power_kobj;
113
114
115
116
117
118
119
120
121
122
123
124static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr,
125 char *buf)
126{
127 char *s = buf;
128#ifdef CONFIG_SUSPEND
129 int i;
130
131 for (i = 0; i < PM_SUSPEND_MAX; i++) {
132 if (pm_states[i] && valid_state(i))
133 s += sprintf(s,"%s ", pm_states[i]);
134 }
135#endif
136#ifdef CONFIG_HIBERNATION
137 s += sprintf(s, "%s\n", "disk");
138#else
139 if (s != buf)
140
141 *(s-1) = '\n';
142#endif
143 return (s - buf);
144}
145
146static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
147 const char *buf, size_t n)
148{
149#ifdef CONFIG_SUSPEND
150 suspend_state_t state = PM_SUSPEND_STANDBY;
151 const char * const *s;
152#endif
153 char *p;
154 int len;
155 int error = -EINVAL;
156
157 p = memchr(buf, '\n', n);
158 len = p ? p - buf : n;
159
160
161 if (len == 4 && !strncmp(buf, "disk", len)) {
162 error = hibernate();
163 goto Exit;
164 }
165
166#ifdef CONFIG_SUSPEND
167 for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) {
168 if (*s && len == strlen(*s) && !strncmp(buf, *s, len))
169 break;
170 }
171 if (state < PM_SUSPEND_MAX && *s)
172 error = enter_state(state);
173#endif
174
175 Exit:
176 return error ? error : n;
177}
178
179power_attr(state);
180
181#ifdef CONFIG_PM_TRACE
182int pm_trace_enabled;
183
184static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr,
185 char *buf)
186{
187 return sprintf(buf, "%d\n", pm_trace_enabled);
188}
189
190static ssize_t
191pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr,
192 const char *buf, size_t n)
193{
194 int val;
195
196 if (sscanf(buf, "%d", &val) == 1) {
197 pm_trace_enabled = !!val;
198 return n;
199 }
200 return -EINVAL;
201}
202
203power_attr(pm_trace);
204#endif
205
206static struct attribute * g[] = {
207 &state_attr.attr,
208#ifdef CONFIG_PM_TRACE
209 &pm_trace_attr.attr,
210#endif
211#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_PM_DEBUG)
212 &pm_test_attr.attr,
213#endif
214 NULL,
215};
216
217static struct attribute_group attr_group = {
218 .attrs = g,
219};
220
221#ifdef CONFIG_PM_RUNTIME
222struct workqueue_struct *pm_wq;
223
224static int __init pm_start_workqueue(void)
225{
226 pm_wq = create_freezeable_workqueue("pm");
227
228 return pm_wq ? 0 : -ENOMEM;
229}
230#else
231static inline int pm_start_workqueue(void) { return 0; }
232#endif
233
234static int __init pm_init(void)
235{
236 int error = pm_start_workqueue();
237 if (error)
238 return error;
239 power_kobj = kobject_create_and_add("power", NULL);
240 if (!power_kobj)
241 return -ENOMEM;
242 return sysfs_create_group(power_kobj, &attr_group);
243}
244
245core_initcall(pm_init);
246