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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
22struct class *power_supply_class;
23EXPORT_SYMBOL_GPL(power_supply_class);
24
25static int __power_supply_changed_work(struct device *dev, void *data)
26{
27 struct power_supply *psy = (struct power_supply *)data;
28 struct power_supply *pst = dev_get_drvdata(dev);
29 int i;
30
31 for (i = 0; i < psy->num_supplicants; i++)
32 if (!strcmp(psy->supplied_to[i], pst->name)) {
33 if (pst->external_power_changed)
34 pst->external_power_changed(pst);
35 }
36 return 0;
37}
38
39static void power_supply_changed_work(struct work_struct *work)
40{
41 struct power_supply *psy = container_of(work, struct power_supply,
42 changed_work);
43
44 dev_dbg(psy->dev, "%s\n", __func__);
45
46 class_for_each_device(power_supply_class, NULL, psy,
47 __power_supply_changed_work);
48
49 power_supply_update_leds(psy);
50
51 kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
52}
53
54void power_supply_changed(struct power_supply *psy)
55{
56 dev_dbg(psy->dev, "%s\n", __func__);
57
58 schedule_work(&psy->changed_work);
59}
60EXPORT_SYMBOL_GPL(power_supply_changed);
61
62static int __power_supply_am_i_supplied(struct device *dev, void *data)
63{
64 union power_supply_propval ret = {0,};
65 struct power_supply *psy = (struct power_supply *)data;
66 struct power_supply *epsy = dev_get_drvdata(dev);
67 int i;
68
69 for (i = 0; i < epsy->num_supplicants; i++) {
70 if (!strcmp(epsy->supplied_to[i], psy->name)) {
71 if (epsy->get_property(epsy,
72 POWER_SUPPLY_PROP_ONLINE, &ret))
73 continue;
74 if (ret.intval)
75 return ret.intval;
76 }
77 }
78 return 0;
79}
80
81int power_supply_am_i_supplied(struct power_supply *psy)
82{
83 int error;
84
85 error = class_for_each_device(power_supply_class, NULL, psy,
86 __power_supply_am_i_supplied);
87
88 dev_dbg(psy->dev, "%s %d\n", __func__, error);
89
90 return error;
91}
92EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
93
94static int __power_supply_is_system_supplied(struct device *dev, void *data)
95{
96 union power_supply_propval ret = {0,};
97 struct power_supply *psy = dev_get_drvdata(dev);
98
99 if (psy->type != POWER_SUPPLY_TYPE_BATTERY) {
100 if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret))
101 return 0;
102 if (ret.intval)
103 return ret.intval;
104 }
105 return 0;
106}
107
108int power_supply_is_system_supplied(void)
109{
110 int error;
111
112 error = class_for_each_device(power_supply_class, NULL, NULL,
113 __power_supply_is_system_supplied);
114
115 return error;
116}
117EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
118
119int power_supply_set_battery_charged(struct power_supply *psy)
120{
121 if (psy->type == POWER_SUPPLY_TYPE_BATTERY && psy->set_charged) {
122 psy->set_charged(psy);
123 return 0;
124 }
125
126 return -EINVAL;
127}
128EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
129
130static int power_supply_match_device_by_name(struct device *dev, void *data)
131{
132 const char *name = data;
133 struct power_supply *psy = dev_get_drvdata(dev);
134
135 return strcmp(psy->name, name) == 0;
136}
137
138struct power_supply *power_supply_get_by_name(char *name)
139{
140 struct device *dev = class_find_device(power_supply_class, NULL, name,
141 power_supply_match_device_by_name);
142
143 return dev ? dev_get_drvdata(dev) : NULL;
144}
145EXPORT_SYMBOL_GPL(power_supply_get_by_name);
146
147int power_supply_register(struct device *parent, struct power_supply *psy)
148{
149 int rc = 0;
150
151 psy->dev = device_create(power_supply_class, parent, 0, psy,
152 "%s", psy->name);
153 if (IS_ERR(psy->dev)) {
154 rc = PTR_ERR(psy->dev);
155 goto dev_create_failed;
156 }
157
158 INIT_WORK(&psy->changed_work, power_supply_changed_work);
159
160 rc = power_supply_create_attrs(psy);
161 if (rc)
162 goto create_attrs_failed;
163
164 rc = power_supply_create_triggers(psy);
165 if (rc)
166 goto create_triggers_failed;
167
168 power_supply_changed(psy);
169
170 goto success;
171
172create_triggers_failed:
173 power_supply_remove_attrs(psy);
174create_attrs_failed:
175 device_unregister(psy->dev);
176dev_create_failed:
177success:
178 return rc;
179}
180EXPORT_SYMBOL_GPL(power_supply_register);
181
182void power_supply_unregister(struct power_supply *psy)
183{
184 flush_scheduled_work();
185 power_supply_remove_triggers(psy);
186 power_supply_remove_attrs(psy);
187 device_unregister(psy->dev);
188}
189EXPORT_SYMBOL_GPL(power_supply_unregister);
190
191static int __init power_supply_class_init(void)
192{
193 power_supply_class = class_create(THIS_MODULE, "power_supply");
194
195 if (IS_ERR(power_supply_class))
196 return PTR_ERR(power_supply_class);
197
198 power_supply_class->dev_uevent = power_supply_uevent;
199
200 return 0;
201}
202
203static void __exit power_supply_class_exit(void)
204{
205 class_destroy(power_supply_class);
206}
207
208subsys_initcall(power_supply_class_init);
209module_exit(power_supply_class_exit);
210
211MODULE_DESCRIPTION("Universal power supply monitor class");
212MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
213 "Szabolcs Gyurko, "
214 "Anton Vorontsov <cbou@mail.ru>");
215MODULE_LICENSE("GPL");
216
