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4a11b59d AV |
1 | /* |
2 | * Universal power supply monitor class | |
3 | * | |
4 | * Copyright © 2007 Anton Vorontsov <cbou@mail.ru> | |
5 | * Copyright © 2004 Szabolcs Gyurko | |
6 | * Copyright © 2003 Ian Molton <spyro@f2s.com> | |
7 | * | |
8 | * Modified: 2004, Oct Szabolcs Gyurko | |
9 | * | |
10 | * You may use this code as per GPL version 2 | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/types.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/device.h> | |
17 | #include <linux/err.h> | |
18 | #include <linux/power_supply.h> | |
19 | #include "power_supply.h" | |
20 | ||
21 | struct class *power_supply_class; | |
22 | ||
443cad92 DY |
23 | static int __power_supply_changed_work(struct device *dev, void *data) |
24 | { | |
25 | struct power_supply *psy = (struct power_supply *)data; | |
26 | struct power_supply *pst = dev_get_drvdata(dev); | |
27 | int i; | |
28 | ||
29 | for (i = 0; i < psy->num_supplicants; i++) | |
30 | if (!strcmp(psy->supplied_to[i], pst->name)) { | |
31 | if (pst->external_power_changed) | |
32 | pst->external_power_changed(pst); | |
33 | } | |
34 | return 0; | |
35 | } | |
36 | ||
4a11b59d AV |
37 | static void power_supply_changed_work(struct work_struct *work) |
38 | { | |
39 | struct power_supply *psy = container_of(work, struct power_supply, | |
40 | changed_work); | |
4a11b59d | 41 | |
0cddc0a9 | 42 | dev_dbg(psy->dev, "%s\n", __func__); |
4a11b59d | 43 | |
443cad92 DY |
44 | class_for_each_device(power_supply_class, psy, |
45 | __power_supply_changed_work); | |
4a11b59d AV |
46 | |
47 | power_supply_update_leds(psy); | |
48 | ||
49 | kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE); | |
4a11b59d AV |
50 | } |
51 | ||
52 | void power_supply_changed(struct power_supply *psy) | |
53 | { | |
0cddc0a9 | 54 | dev_dbg(psy->dev, "%s\n", __func__); |
4a11b59d AV |
55 | |
56 | schedule_work(&psy->changed_work); | |
4a11b59d AV |
57 | } |
58 | ||
443cad92 | 59 | static int __power_supply_am_i_supplied(struct device *dev, void *data) |
4a11b59d AV |
60 | { |
61 | union power_supply_propval ret = {0,}; | |
443cad92 DY |
62 | struct power_supply *psy = (struct power_supply *)data; |
63 | struct power_supply *epsy = dev_get_drvdata(dev); | |
64 | int i; | |
65 | ||
66 | for (i = 0; i < epsy->num_supplicants; i++) { | |
67 | if (!strcmp(epsy->supplied_to[i], psy->name)) { | |
68 | if (epsy->get_property(epsy, | |
69 | POWER_SUPPLY_PROP_ONLINE, &ret)) | |
70 | continue; | |
71 | if (ret.intval) | |
72 | return ret.intval; | |
4a11b59d AV |
73 | } |
74 | } | |
443cad92 DY |
75 | return 0; |
76 | } | |
77 | ||
78 | int power_supply_am_i_supplied(struct power_supply *psy) | |
79 | { | |
80 | int error; | |
81 | ||
82 | error = class_for_each_device(power_supply_class, psy, | |
83 | __power_supply_am_i_supplied); | |
4a11b59d | 84 | |
0cddc0a9 | 85 | dev_dbg(psy->dev, "%s %d\n", __func__, error); |
4a11b59d | 86 | |
443cad92 | 87 | return error; |
4a11b59d AV |
88 | } |
89 | ||
90 | int power_supply_register(struct device *parent, struct power_supply *psy) | |
91 | { | |
92 | int rc = 0; | |
93 | ||
94 | psy->dev = device_create(power_supply_class, parent, 0, | |
95 | "%s", psy->name); | |
96 | if (IS_ERR(psy->dev)) { | |
97 | rc = PTR_ERR(psy->dev); | |
98 | goto dev_create_failed; | |
99 | } | |
100 | ||
101 | dev_set_drvdata(psy->dev, psy); | |
102 | ||
103 | INIT_WORK(&psy->changed_work, power_supply_changed_work); | |
104 | ||
105 | rc = power_supply_create_attrs(psy); | |
106 | if (rc) | |
107 | goto create_attrs_failed; | |
108 | ||
109 | rc = power_supply_create_triggers(psy); | |
110 | if (rc) | |
111 | goto create_triggers_failed; | |
112 | ||
113 | power_supply_changed(psy); | |
114 | ||
115 | goto success; | |
116 | ||
117 | create_triggers_failed: | |
118 | power_supply_remove_attrs(psy); | |
119 | create_attrs_failed: | |
120 | device_unregister(psy->dev); | |
121 | dev_create_failed: | |
122 | success: | |
123 | return rc; | |
124 | } | |
125 | ||
126 | void power_supply_unregister(struct power_supply *psy) | |
127 | { | |
128 | flush_scheduled_work(); | |
129 | power_supply_remove_triggers(psy); | |
130 | power_supply_remove_attrs(psy); | |
131 | device_unregister(psy->dev); | |
4a11b59d AV |
132 | } |
133 | ||
134 | static int __init power_supply_class_init(void) | |
135 | { | |
136 | power_supply_class = class_create(THIS_MODULE, "power_supply"); | |
137 | ||
138 | if (IS_ERR(power_supply_class)) | |
139 | return PTR_ERR(power_supply_class); | |
140 | ||
141 | power_supply_class->dev_uevent = power_supply_uevent; | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
146 | static void __exit power_supply_class_exit(void) | |
147 | { | |
148 | class_destroy(power_supply_class); | |
4a11b59d AV |
149 | } |
150 | ||
151 | EXPORT_SYMBOL_GPL(power_supply_changed); | |
152 | EXPORT_SYMBOL_GPL(power_supply_am_i_supplied); | |
153 | EXPORT_SYMBOL_GPL(power_supply_register); | |
154 | EXPORT_SYMBOL_GPL(power_supply_unregister); | |
155 | ||
156 | /* exported for the APM Power driver, APM emulation */ | |
157 | EXPORT_SYMBOL_GPL(power_supply_class); | |
158 | ||
159 | subsys_initcall(power_supply_class_init); | |
160 | module_exit(power_supply_class_exit); | |
161 | ||
162 | MODULE_DESCRIPTION("Universal power supply monitor class"); | |
163 | MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, " | |
164 | "Szabolcs Gyurko, " | |
165 | "Anton Vorontsov <cbou@mail.ru>"); | |
166 | MODULE_LICENSE("GPL"); |