Commit | Line | Data |
---|---|---|
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> |
1da177e4 LT |
14 | |
15 | #include "power.h" | |
16 | ||
a6d70980 | 17 | DEFINE_MUTEX(pm_mutex); |
1da177e4 | 18 | |
9f9adecd LB |
19 | unsigned int pm_flags; |
20 | EXPORT_SYMBOL(pm_flags); | |
21 | ||
82525756 AS |
22 | #ifdef CONFIG_PM_SLEEP |
23 | ||
24 | /* Routines for PM-transition notifications */ | |
25 | ||
26 | static BLOCKING_NOTIFIER_HEAD(pm_chain_head); | |
27 | ||
28 | int register_pm_notifier(struct notifier_block *nb) | |
29 | { | |
30 | return blocking_notifier_chain_register(&pm_chain_head, nb); | |
31 | } | |
32 | EXPORT_SYMBOL_GPL(register_pm_notifier); | |
33 | ||
34 | int unregister_pm_notifier(struct notifier_block *nb) | |
35 | { | |
36 | return blocking_notifier_chain_unregister(&pm_chain_head, nb); | |
37 | } | |
38 | EXPORT_SYMBOL_GPL(unregister_pm_notifier); | |
39 | ||
40 | int pm_notifier_call_chain(unsigned long val) | |
41 | { | |
42 | return (blocking_notifier_call_chain(&pm_chain_head, val, NULL) | |
43 | == NOTIFY_BAD) ? -EINVAL : 0; | |
44 | } | |
45 | ||
0e7d56e3 RW |
46 | #ifdef CONFIG_PM_DEBUG |
47 | int pm_test_level = TEST_NONE; | |
48 | ||
0e7d56e3 RW |
49 | static const char * const pm_tests[__TEST_AFTER_LAST] = { |
50 | [TEST_NONE] = "none", | |
51 | [TEST_CORE] = "core", | |
52 | [TEST_CPUS] = "processors", | |
53 | [TEST_PLATFORM] = "platform", | |
54 | [TEST_DEVICES] = "devices", | |
55 | [TEST_FREEZER] = "freezer", | |
56 | }; | |
57 | ||
039a75c6 RW |
58 | static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr, |
59 | char *buf) | |
0e7d56e3 RW |
60 | { |
61 | char *s = buf; | |
62 | int level; | |
63 | ||
64 | for (level = TEST_FIRST; level <= TEST_MAX; level++) | |
65 | if (pm_tests[level]) { | |
66 | if (level == pm_test_level) | |
67 | s += sprintf(s, "[%s] ", pm_tests[level]); | |
68 | else | |
69 | s += sprintf(s, "%s ", pm_tests[level]); | |
70 | } | |
71 | ||
72 | if (s != buf) | |
73 | /* convert the last space to a newline */ | |
74 | *(s-1) = '\n'; | |
75 | ||
76 | return (s - buf); | |
77 | } | |
78 | ||
039a75c6 RW |
79 | static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr, |
80 | const char *buf, size_t n) | |
0e7d56e3 RW |
81 | { |
82 | const char * const *s; | |
83 | int level; | |
84 | char *p; | |
85 | int len; | |
86 | int error = -EINVAL; | |
87 | ||
88 | p = memchr(buf, '\n', n); | |
89 | len = p ? p - buf : n; | |
90 | ||
91 | mutex_lock(&pm_mutex); | |
92 | ||
93 | level = TEST_FIRST; | |
94 | for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++) | |
95 | if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) { | |
96 | pm_test_level = level; | |
97 | error = 0; | |
98 | break; | |
99 | } | |
100 | ||
101 | mutex_unlock(&pm_mutex); | |
102 | ||
103 | return error ? error : n; | |
104 | } | |
105 | ||
106 | power_attr(pm_test); | |
091d71e0 | 107 | #endif /* CONFIG_PM_DEBUG */ |
0e7d56e3 | 108 | |
7671b8ae | 109 | #endif /* CONFIG_PM_SLEEP */ |
039a75c6 | 110 | |
d76e15fb | 111 | struct kobject *power_kobj; |
1da177e4 LT |
112 | |
113 | /** | |
114 | * state - control system power state. | |
115 | * | |
116 | * show() returns what states are supported, which is hard-coded to | |
117 | * 'standby' (Power-On Suspend), 'mem' (Suspend-to-RAM), and | |
118 | * 'disk' (Suspend-to-Disk). | |
119 | * | |
120 | * store() accepts one of those strings, translates it into the | |
121 | * proper enumerated value, and initiates a suspend transition. | |
122 | */ | |
386f275f KS |
123 | static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, |
124 | char *buf) | |
1da177e4 | 125 | { |
296699de RW |
126 | char *s = buf; |
127 | #ifdef CONFIG_SUSPEND | |
1da177e4 | 128 | int i; |
1da177e4 LT |
129 | |
130 | for (i = 0; i < PM_SUSPEND_MAX; i++) { | |
123d3c13 PM |
131 | if (pm_states[i] && valid_state(i)) |
132 | s += sprintf(s,"%s ", pm_states[i]); | |
1da177e4 | 133 | } |
296699de | 134 | #endif |
b0cb1a19 | 135 | #ifdef CONFIG_HIBERNATION |
a3d25c27 RW |
136 | s += sprintf(s, "%s\n", "disk"); |
137 | #else | |
138 | if (s != buf) | |
139 | /* convert the last space to a newline */ | |
140 | *(s-1) = '\n'; | |
141 | #endif | |
1da177e4 LT |
142 | return (s - buf); |
143 | } | |
144 | ||
386f275f KS |
145 | static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, |
146 | const char *buf, size_t n) | |
1da177e4 | 147 | { |
296699de | 148 | #ifdef CONFIG_SUSPEND |
1da177e4 | 149 | suspend_state_t state = PM_SUSPEND_STANDBY; |
3b364b8d | 150 | const char * const *s; |
296699de | 151 | #endif |
1da177e4 | 152 | char *p; |
1da177e4 | 153 | int len; |
296699de | 154 | int error = -EINVAL; |
1da177e4 LT |
155 | |
156 | p = memchr(buf, '\n', n); | |
157 | len = p ? p - buf : n; | |
158 | ||
a3d25c27 | 159 | /* First, check if we are requested to hibernate */ |
8d98a690 | 160 | if (len == 4 && !strncmp(buf, "disk", len)) { |
a3d25c27 | 161 | error = hibernate(); |
296699de | 162 | goto Exit; |
a3d25c27 RW |
163 | } |
164 | ||
296699de | 165 | #ifdef CONFIG_SUSPEND |
1da177e4 | 166 | for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) { |
8d98a690 | 167 | if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) |
1da177e4 LT |
168 | break; |
169 | } | |
47bb7899 | 170 | if (state < PM_SUSPEND_MAX && *s) |
1da177e4 | 171 | error = enter_state(state); |
296699de RW |
172 | #endif |
173 | ||
174 | Exit: | |
1da177e4 LT |
175 | return error ? error : n; |
176 | } | |
177 | ||
178 | power_attr(state); | |
179 | ||
c5c6ba4e RW |
180 | #ifdef CONFIG_PM_TRACE |
181 | int pm_trace_enabled; | |
182 | ||
386f275f KS |
183 | static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr, |
184 | char *buf) | |
c5c6ba4e RW |
185 | { |
186 | return sprintf(buf, "%d\n", pm_trace_enabled); | |
187 | } | |
188 | ||
189 | static ssize_t | |
386f275f KS |
190 | pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr, |
191 | const char *buf, size_t n) | |
c5c6ba4e RW |
192 | { |
193 | int val; | |
194 | ||
195 | if (sscanf(buf, "%d", &val) == 1) { | |
196 | pm_trace_enabled = !!val; | |
197 | return n; | |
198 | } | |
199 | return -EINVAL; | |
200 | } | |
201 | ||
202 | power_attr(pm_trace); | |
0e7d56e3 | 203 | #endif /* CONFIG_PM_TRACE */ |
c5c6ba4e RW |
204 | |
205 | static struct attribute * g[] = { | |
206 | &state_attr.attr, | |
0e7d56e3 | 207 | #ifdef CONFIG_PM_TRACE |
c5c6ba4e | 208 | &pm_trace_attr.attr, |
0e7d56e3 | 209 | #endif |
7671b8ae | 210 | #if defined(CONFIG_PM_SLEEP) && defined(CONFIG_PM_DEBUG) |
0e7d56e3 RW |
211 | &pm_test_attr.attr, |
212 | #endif | |
c5c6ba4e RW |
213 | NULL, |
214 | }; | |
1da177e4 LT |
215 | |
216 | static struct attribute_group attr_group = { | |
217 | .attrs = g, | |
218 | }; | |
219 | ||
1da177e4 LT |
220 | static int __init pm_init(void) |
221 | { | |
d76e15fb GKH |
222 | power_kobj = kobject_create_and_add("power", NULL); |
223 | if (!power_kobj) | |
039a5dcd | 224 | return -ENOMEM; |
d76e15fb | 225 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
226 | } |
227 | ||
228 | core_initcall(pm_init); |