V4L/DVB (6715): ivtv: Remove unnecessary register update
[linux-2.6/verdex.git] / drivers / power / power_supply_core.c
blob03d6a38464ef8ca8d27c589b35735b0452d1aa97
1 /*
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 int __power_supply_changed_work(struct device *dev, void *data)
25 struct power_supply *psy = (struct power_supply *)data;
26 struct power_supply *pst = dev_get_drvdata(dev);
27 int i;
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);
34 return 0;
37 static void power_supply_changed_work(struct work_struct *work)
39 struct power_supply *psy = container_of(work, struct power_supply,
40 changed_work);
42 dev_dbg(psy->dev, "%s\n", __FUNCTION__);
44 class_for_each_device(power_supply_class, psy,
45 __power_supply_changed_work);
47 power_supply_update_leds(psy);
49 kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
52 void power_supply_changed(struct power_supply *psy)
54 dev_dbg(psy->dev, "%s\n", __FUNCTION__);
56 schedule_work(&psy->changed_work);
59 static int __power_supply_am_i_supplied(struct device *dev, void *data)
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;
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;
75 return 0;
78 int power_supply_am_i_supplied(struct power_supply *psy)
80 int error;
82 error = class_for_each_device(power_supply_class, psy,
83 __power_supply_am_i_supplied);
85 dev_dbg(psy->dev, "%s %d\n", __FUNCTION__, error);
87 return error;
90 int power_supply_register(struct device *parent, struct power_supply *psy)
92 int rc = 0;
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;
101 dev_set_drvdata(psy->dev, psy);
103 INIT_WORK(&psy->changed_work, power_supply_changed_work);
105 rc = power_supply_create_attrs(psy);
106 if (rc)
107 goto create_attrs_failed;
109 rc = power_supply_create_triggers(psy);
110 if (rc)
111 goto create_triggers_failed;
113 power_supply_changed(psy);
115 goto success;
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;
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);
134 static int __init power_supply_class_init(void)
136 power_supply_class = class_create(THIS_MODULE, "power_supply");
138 if (IS_ERR(power_supply_class))
139 return PTR_ERR(power_supply_class);
141 power_supply_class->dev_uevent = power_supply_uevent;
143 return 0;
146 static void __exit power_supply_class_exit(void)
148 class_destroy(power_supply_class);
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);
156 /* exported for the APM Power driver, APM emulation */
157 EXPORT_SYMBOL_GPL(power_supply_class);
159 subsys_initcall(power_supply_class_init);
160 module_exit(power_supply_class_exit);
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");