Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * kernel/power/main.c - PM subsystem core functionality. | |
3 | * | |
4 | * Copyright (c) 2003 Patrick Mochel | |
5 | * Copyright (c) 2003 Open Source Development Lab | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | */ | |
10 | ||
1da177e4 LT |
11 | #include <linux/kobject.h> |
12 | #include <linux/string.h> | |
c5c6ba4e | 13 | #include <linux/resume-trace.h> |
5e928f77 | 14 | #include <linux/workqueue.h> |
1da177e4 LT |
15 | |
16 | #include "power.h" | |
17 | ||
a6d70980 | 18 | DEFINE_MUTEX(pm_mutex); |
1da177e4 | 19 | |
9f9adecd LB |
20 | unsigned int pm_flags; |
21 | EXPORT_SYMBOL(pm_flags); | |
22 | ||
82525756 AS |
23 | #ifdef CONFIG_PM_SLEEP |
24 | ||
25 | /* Routines for PM-transition notifications */ | |
26 | ||
27 | static BLOCKING_NOTIFIER_HEAD(pm_chain_head); | |
28 | ||
29 | int register_pm_notifier(struct notifier_block *nb) | |
30 | { | |
31 | return blocking_notifier_chain_register(&pm_chain_head, nb); | |
32 | } | |
33 | EXPORT_SYMBOL_GPL(register_pm_notifier); | |
34 | ||
35 | int unregister_pm_notifier(struct notifier_block *nb) | |
36 | { | |
37 | return blocking_notifier_chain_unregister(&pm_chain_head, nb); | |
38 | } | |
39 | EXPORT_SYMBOL_GPL(unregister_pm_notifier); | |
40 | ||
41 | int 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 | ||
0e7d56e3 RW |
47 | #ifdef CONFIG_PM_DEBUG |
48 | int pm_test_level = TEST_NONE; | |
49 | ||
0e7d56e3 RW |
50 | static 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 | ||
039a75c6 RW |
59 | static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr, |
60 | char *buf) | |
0e7d56e3 RW |
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 | /* convert the last space to a newline */ | |
75 | *(s-1) = '\n'; | |
76 | ||
77 | return (s - buf); | |
78 | } | |
79 | ||
039a75c6 RW |
80 | static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr, |
81 | const char *buf, size_t n) | |
0e7d56e3 RW |
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 | ||
107 | power_attr(pm_test); | |
091d71e0 | 108 | #endif /* CONFIG_PM_DEBUG */ |
0e7d56e3 | 109 | |
7671b8ae | 110 | #endif /* CONFIG_PM_SLEEP */ |
039a75c6 | 111 | |
d76e15fb | 112 | struct kobject *power_kobj; |
1da177e4 LT |
113 | |
114 | /** | |
115 | * state - control system power state. | |
116 | * | |
117 | * show() returns what states are supported, which is hard-coded to | |
118 | * 'standby' (Power-On Suspend), 'mem' (Suspend-to-RAM), and | |
119 | * 'disk' (Suspend-to-Disk). | |
120 | * | |
121 | * store() accepts one of those strings, translates it into the | |
122 | * proper enumerated value, and initiates a suspend transition. | |
123 | */ | |
386f275f KS |
124 | static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, |
125 | char *buf) | |
1da177e4 | 126 | { |
296699de RW |
127 | char *s = buf; |
128 | #ifdef CONFIG_SUSPEND | |
1da177e4 | 129 | int i; |
1da177e4 LT |
130 | |
131 | for (i = 0; i < PM_SUSPEND_MAX; i++) { | |
123d3c13 PM |
132 | if (pm_states[i] && valid_state(i)) |
133 | s += sprintf(s,"%s ", pm_states[i]); | |
1da177e4 | 134 | } |
296699de | 135 | #endif |
b0cb1a19 | 136 | #ifdef CONFIG_HIBERNATION |
a3d25c27 RW |
137 | s += sprintf(s, "%s\n", "disk"); |
138 | #else | |
139 | if (s != buf) | |
140 | /* convert the last space to a newline */ | |
141 | *(s-1) = '\n'; | |
142 | #endif | |
1da177e4 LT |
143 | return (s - buf); |
144 | } | |
145 | ||
386f275f KS |
146 | static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, |
147 | const char *buf, size_t n) | |
1da177e4 | 148 | { |
296699de | 149 | #ifdef CONFIG_SUSPEND |
1da177e4 | 150 | suspend_state_t state = PM_SUSPEND_STANDBY; |
3b364b8d | 151 | const char * const *s; |
296699de | 152 | #endif |
1da177e4 | 153 | char *p; |
1da177e4 | 154 | int len; |
296699de | 155 | int error = -EINVAL; |
1da177e4 LT |
156 | |
157 | p = memchr(buf, '\n', n); | |
158 | len = p ? p - buf : n; | |
159 | ||
a3d25c27 | 160 | /* First, check if we are requested to hibernate */ |
8d98a690 | 161 | if (len == 4 && !strncmp(buf, "disk", len)) { |
a3d25c27 | 162 | error = hibernate(); |
296699de | 163 | goto Exit; |
a3d25c27 RW |
164 | } |
165 | ||
296699de | 166 | #ifdef CONFIG_SUSPEND |
1da177e4 | 167 | for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) { |
8d98a690 | 168 | if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) |
1da177e4 LT |
169 | break; |
170 | } | |
47bb7899 | 171 | if (state < PM_SUSPEND_MAX && *s) |
1da177e4 | 172 | error = enter_state(state); |
296699de RW |
173 | #endif |
174 | ||
175 | Exit: | |
1da177e4 LT |
176 | return error ? error : n; |
177 | } | |
178 | ||
179 | power_attr(state); | |
180 | ||
c5c6ba4e RW |
181 | #ifdef CONFIG_PM_TRACE |
182 | int pm_trace_enabled; | |
183 | ||
386f275f KS |
184 | static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr, |
185 | char *buf) | |
c5c6ba4e RW |
186 | { |
187 | return sprintf(buf, "%d\n", pm_trace_enabled); | |
188 | } | |
189 | ||
190 | static ssize_t | |
386f275f KS |
191 | pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr, |
192 | const char *buf, size_t n) | |
c5c6ba4e RW |
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 | ||
203 | power_attr(pm_trace); | |
0e7d56e3 | 204 | #endif /* CONFIG_PM_TRACE */ |
c5c6ba4e RW |
205 | |
206 | static struct attribute * g[] = { | |
207 | &state_attr.attr, | |
0e7d56e3 | 208 | #ifdef CONFIG_PM_TRACE |
c5c6ba4e | 209 | &pm_trace_attr.attr, |
0e7d56e3 | 210 | #endif |
7671b8ae | 211 | #if defined(CONFIG_PM_SLEEP) && defined(CONFIG_PM_DEBUG) |
0e7d56e3 RW |
212 | &pm_test_attr.attr, |
213 | #endif | |
c5c6ba4e RW |
214 | NULL, |
215 | }; | |
1da177e4 LT |
216 | |
217 | static struct attribute_group attr_group = { | |
218 | .attrs = g, | |
219 | }; | |
220 | ||
5e928f77 RW |
221 | #ifdef CONFIG_PM_RUNTIME |
222 | struct workqueue_struct *pm_wq; | |
223 | ||
224 | static int __init pm_start_workqueue(void) | |
225 | { | |
226 | pm_wq = create_freezeable_workqueue("pm"); | |
227 | ||
228 | return pm_wq ? 0 : -ENOMEM; | |
229 | } | |
230 | #else | |
231 | static inline int pm_start_workqueue(void) { return 0; } | |
232 | #endif | |
233 | ||
1da177e4 LT |
234 | static int __init pm_init(void) |
235 | { | |
5e928f77 RW |
236 | int error = pm_start_workqueue(); |
237 | if (error) | |
238 | return error; | |
d76e15fb GKH |
239 | power_kobj = kobject_create_and_add("power", NULL); |
240 | if (!power_kobj) | |
039a5dcd | 241 | return -ENOMEM; |
d76e15fb | 242 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
243 | } |
244 | ||
245 | core_initcall(pm_init); |