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
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
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);
41
42 dev_dbg(psy->dev, "%s\n", __FUNCTION__);
43
44 class_for_each_device(power_supply_class, psy,
45 __power_supply_changed_work);
46
47 power_supply_update_leds(psy);
48
49 kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
50 }
51
52 void power_supply_changed(struct power_supply *psy)
53 {
54 dev_dbg(psy->dev, "%s\n", __FUNCTION__);
55
56 schedule_work(&psy->changed_work);
57 }
58
59 static int __power_supply_am_i_supplied(struct device *dev, void *data)
60 {
61 union power_supply_propval ret = {0,};
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;
73 }
74 }
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);
84
85 dev_dbg(psy->dev, "%s %d\n", __FUNCTION__, error);
86
87 return error;
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);
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);
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");
167
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