2 * Universal power supply monitor class
4 * Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
5 * Copyright © 2004 Szabolcs Gyurko
6 * Copyright © 2003 Ian Molton <spyro@f2s.com>
8 * Modified: 2004, Oct Szabolcs Gyurko
10 * You may use this code as per GPL version 2
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"
21 struct class *power_supply_class;
23 static void power_supply_changed_work(struct work_struct *work)
25 struct power_supply *psy = container_of(work, struct power_supply,
29 dev_dbg(psy->dev, "%s\n", __FUNCTION__);
31 for (i = 0; i < psy->num_supplicants; i++) {
34 down(&power_supply_class->sem);
35 list_for_each_entry(dev, &power_supply_class->devices, node) {
36 struct power_supply *pst = dev_get_drvdata(dev);
38 if (!strcmp(psy->supplied_to[i], pst->name)) {
39 if (pst->external_power_changed)
40 pst->external_power_changed(pst);
43 up(&power_supply_class->sem);
46 power_supply_update_leds(psy);
48 kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
53 void power_supply_changed(struct power_supply *psy)
55 dev_dbg(psy->dev, "%s\n", __FUNCTION__);
57 schedule_work(&psy->changed_work);
62 int power_supply_am_i_supplied(struct power_supply *psy)
64 union power_supply_propval ret = {0,};
67 down(&power_supply_class->sem);
68 list_for_each_entry(dev, &power_supply_class->devices, node) {
69 struct power_supply *epsy = dev_get_drvdata(dev);
72 for (i = 0; i < epsy->num_supplicants; i++) {
73 if (!strcmp(epsy->supplied_to[i], psy->name)) {
74 if (epsy->get_property(epsy,
75 POWER_SUPPLY_PROP_ONLINE, &ret))
83 up(&power_supply_class->sem);
85 dev_dbg(psy->dev, "%s %d\n", __FUNCTION__, ret.intval);
90 int power_supply_register(struct device *parent, struct power_supply *psy)
94 psy->dev = device_create(power_supply_class, parent, 0,
96 if (IS_ERR(psy->dev)) {
97 rc = PTR_ERR(psy->dev);
98 goto dev_create_failed;
101 dev_set_drvdata(psy->dev, psy);
103 INIT_WORK(&psy->changed_work, power_supply_changed_work);
105 rc = power_supply_create_attrs(psy);
107 goto create_attrs_failed;
109 rc = power_supply_create_triggers(psy);
111 goto create_triggers_failed;
113 power_supply_changed(psy);
117 create_triggers_failed:
118 power_supply_remove_attrs(psy);
120 device_unregister(psy->dev);
126 void power_supply_unregister(struct power_supply *psy)
128 flush_scheduled_work();
129 power_supply_remove_triggers(psy);
130 power_supply_remove_attrs(psy);
131 device_unregister(psy->dev);
135 static int __init power_supply_class_init(void)
137 power_supply_class = class_create(THIS_MODULE, "power_supply");
139 if (IS_ERR(power_supply_class))
140 return PTR_ERR(power_supply_class);
142 power_supply_class->dev_uevent = power_supply_uevent;
147 static void __exit power_supply_class_exit(void)
149 class_destroy(power_supply_class);
153 EXPORT_SYMBOL_GPL(power_supply_changed);
154 EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
155 EXPORT_SYMBOL_GPL(power_supply_register);
156 EXPORT_SYMBOL_GPL(power_supply_unregister);
158 /* exported for the APM Power driver, APM emulation */
159 EXPORT_SYMBOL_GPL(power_supply_class);
161 subsys_initcall(power_supply_class_init);
162 module_exit(power_supply_class_exit);
164 MODULE_DESCRIPTION("Universal power supply monitor class");
165 MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
167 "Anton Vorontsov <cbou@mail.ru>");
168 MODULE_LICENSE("GPL");