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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 | ||
0e06b4a8 RW |
47 | /* If set, devices may be suspended and resumed asynchronously. */ |
48 | int pm_async_enabled = 1; | |
49 | ||
50 | static ssize_t pm_async_show(struct kobject *kobj, struct kobj_attribute *attr, | |
51 | char *buf) | |
52 | { | |
53 | return sprintf(buf, "%d\n", pm_async_enabled); | |
54 | } | |
55 | ||
56 | static ssize_t pm_async_store(struct kobject *kobj, struct kobj_attribute *attr, | |
57 | const char *buf, size_t n) | |
58 | { | |
59 | unsigned long val; | |
60 | ||
61 | if (strict_strtoul(buf, 10, &val)) | |
62 | return -EINVAL; | |
63 | ||
64 | if (val > 1) | |
65 | return -EINVAL; | |
66 | ||
67 | pm_async_enabled = val; | |
68 | return n; | |
69 | } | |
70 | ||
71 | power_attr(pm_async); | |
72 | ||
0e7d56e3 RW |
73 | #ifdef CONFIG_PM_DEBUG |
74 | int pm_test_level = TEST_NONE; | |
75 | ||
0e7d56e3 RW |
76 | static const char * const pm_tests[__TEST_AFTER_LAST] = { |
77 | [TEST_NONE] = "none", | |
78 | [TEST_CORE] = "core", | |
79 | [TEST_CPUS] = "processors", | |
80 | [TEST_PLATFORM] = "platform", | |
81 | [TEST_DEVICES] = "devices", | |
82 | [TEST_FREEZER] = "freezer", | |
83 | }; | |
84 | ||
039a75c6 RW |
85 | static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr, |
86 | char *buf) | |
0e7d56e3 RW |
87 | { |
88 | char *s = buf; | |
89 | int level; | |
90 | ||
91 | for (level = TEST_FIRST; level <= TEST_MAX; level++) | |
92 | if (pm_tests[level]) { | |
93 | if (level == pm_test_level) | |
94 | s += sprintf(s, "[%s] ", pm_tests[level]); | |
95 | else | |
96 | s += sprintf(s, "%s ", pm_tests[level]); | |
97 | } | |
98 | ||
99 | if (s != buf) | |
100 | /* convert the last space to a newline */ | |
101 | *(s-1) = '\n'; | |
102 | ||
103 | return (s - buf); | |
104 | } | |
105 | ||
039a75c6 RW |
106 | static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr, |
107 | const char *buf, size_t n) | |
0e7d56e3 RW |
108 | { |
109 | const char * const *s; | |
110 | int level; | |
111 | char *p; | |
112 | int len; | |
113 | int error = -EINVAL; | |
114 | ||
115 | p = memchr(buf, '\n', n); | |
116 | len = p ? p - buf : n; | |
117 | ||
118 | mutex_lock(&pm_mutex); | |
119 | ||
120 | level = TEST_FIRST; | |
121 | for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++) | |
122 | if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) { | |
123 | pm_test_level = level; | |
124 | error = 0; | |
125 | break; | |
126 | } | |
127 | ||
128 | mutex_unlock(&pm_mutex); | |
129 | ||
130 | return error ? error : n; | |
131 | } | |
132 | ||
133 | power_attr(pm_test); | |
091d71e0 | 134 | #endif /* CONFIG_PM_DEBUG */ |
0e7d56e3 | 135 | |
7671b8ae | 136 | #endif /* CONFIG_PM_SLEEP */ |
039a75c6 | 137 | |
d76e15fb | 138 | struct kobject *power_kobj; |
1da177e4 LT |
139 | |
140 | /** | |
141 | * state - control system power state. | |
142 | * | |
143 | * show() returns what states are supported, which is hard-coded to | |
144 | * 'standby' (Power-On Suspend), 'mem' (Suspend-to-RAM), and | |
145 | * 'disk' (Suspend-to-Disk). | |
146 | * | |
147 | * store() accepts one of those strings, translates it into the | |
148 | * proper enumerated value, and initiates a suspend transition. | |
149 | */ | |
386f275f KS |
150 | static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, |
151 | char *buf) | |
1da177e4 | 152 | { |
296699de RW |
153 | char *s = buf; |
154 | #ifdef CONFIG_SUSPEND | |
1da177e4 | 155 | int i; |
1da177e4 LT |
156 | |
157 | for (i = 0; i < PM_SUSPEND_MAX; i++) { | |
123d3c13 PM |
158 | if (pm_states[i] && valid_state(i)) |
159 | s += sprintf(s,"%s ", pm_states[i]); | |
1da177e4 | 160 | } |
296699de | 161 | #endif |
b0cb1a19 | 162 | #ifdef CONFIG_HIBERNATION |
a3d25c27 RW |
163 | s += sprintf(s, "%s\n", "disk"); |
164 | #else | |
165 | if (s != buf) | |
166 | /* convert the last space to a newline */ | |
167 | *(s-1) = '\n'; | |
168 | #endif | |
1da177e4 LT |
169 | return (s - buf); |
170 | } | |
171 | ||
386f275f KS |
172 | static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, |
173 | const char *buf, size_t n) | |
1da177e4 | 174 | { |
296699de | 175 | #ifdef CONFIG_SUSPEND |
1da177e4 | 176 | suspend_state_t state = PM_SUSPEND_STANDBY; |
3b364b8d | 177 | const char * const *s; |
296699de | 178 | #endif |
1da177e4 | 179 | char *p; |
1da177e4 | 180 | int len; |
296699de | 181 | int error = -EINVAL; |
1da177e4 LT |
182 | |
183 | p = memchr(buf, '\n', n); | |
184 | len = p ? p - buf : n; | |
185 | ||
a3d25c27 | 186 | /* First, check if we are requested to hibernate */ |
8d98a690 | 187 | if (len == 4 && !strncmp(buf, "disk", len)) { |
a3d25c27 | 188 | error = hibernate(); |
296699de | 189 | goto Exit; |
a3d25c27 RW |
190 | } |
191 | ||
296699de | 192 | #ifdef CONFIG_SUSPEND |
1da177e4 | 193 | for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) { |
8d98a690 | 194 | if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) |
1da177e4 LT |
195 | break; |
196 | } | |
47bb7899 | 197 | if (state < PM_SUSPEND_MAX && *s) |
1da177e4 | 198 | error = enter_state(state); |
296699de RW |
199 | #endif |
200 | ||
201 | Exit: | |
1da177e4 LT |
202 | return error ? error : n; |
203 | } | |
204 | ||
205 | power_attr(state); | |
206 | ||
c5c6ba4e RW |
207 | #ifdef CONFIG_PM_TRACE |
208 | int pm_trace_enabled; | |
209 | ||
386f275f KS |
210 | static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr, |
211 | char *buf) | |
c5c6ba4e RW |
212 | { |
213 | return sprintf(buf, "%d\n", pm_trace_enabled); | |
214 | } | |
215 | ||
216 | static ssize_t | |
386f275f KS |
217 | pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr, |
218 | const char *buf, size_t n) | |
c5c6ba4e RW |
219 | { |
220 | int val; | |
221 | ||
222 | if (sscanf(buf, "%d", &val) == 1) { | |
223 | pm_trace_enabled = !!val; | |
224 | return n; | |
225 | } | |
226 | return -EINVAL; | |
227 | } | |
228 | ||
229 | power_attr(pm_trace); | |
0e7d56e3 | 230 | #endif /* CONFIG_PM_TRACE */ |
c5c6ba4e RW |
231 | |
232 | static struct attribute * g[] = { | |
233 | &state_attr.attr, | |
0e7d56e3 | 234 | #ifdef CONFIG_PM_TRACE |
c5c6ba4e | 235 | &pm_trace_attr.attr, |
0e7d56e3 | 236 | #endif |
0e06b4a8 RW |
237 | #ifdef CONFIG_PM_SLEEP |
238 | &pm_async_attr.attr, | |
239 | #ifdef CONFIG_PM_DEBUG | |
0e7d56e3 | 240 | &pm_test_attr.attr, |
0e06b4a8 | 241 | #endif |
0e7d56e3 | 242 | #endif |
c5c6ba4e RW |
243 | NULL, |
244 | }; | |
1da177e4 LT |
245 | |
246 | static struct attribute_group attr_group = { | |
247 | .attrs = g, | |
248 | }; | |
249 | ||
5e928f77 RW |
250 | #ifdef CONFIG_PM_RUNTIME |
251 | struct workqueue_struct *pm_wq; | |
7b199ca2 | 252 | EXPORT_SYMBOL_GPL(pm_wq); |
5e928f77 RW |
253 | |
254 | static int __init pm_start_workqueue(void) | |
255 | { | |
256 | pm_wq = create_freezeable_workqueue("pm"); | |
257 | ||
258 | return pm_wq ? 0 : -ENOMEM; | |
259 | } | |
260 | #else | |
261 | static inline int pm_start_workqueue(void) { return 0; } | |
262 | #endif | |
263 | ||
1da177e4 LT |
264 | static int __init pm_init(void) |
265 | { | |
5e928f77 RW |
266 | int error = pm_start_workqueue(); |
267 | if (error) | |
268 | return error; | |
d76e15fb GKH |
269 | power_kobj = kobject_create_and_add("power", NULL); |
270 | if (!power_kobj) | |
039a5dcd | 271 | return -ENOMEM; |
d76e15fb | 272 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
273 | } |
274 | ||
275 | core_initcall(pm_init); |