tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
21struct class *power_supply_class;
22
23static 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
37static 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
52void 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
59static 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
78int 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
90int 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
117create_triggers_failed:
118 power_supply_remove_attrs(psy);
119create_attrs_failed:
120 device_unregister(psy->dev);
121dev_create_failed:
122success:
123 return rc;
124}
125
126void 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
134static 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
146static void __exit power_supply_class_exit(void)
147{
148 class_destroy(power_supply_class);
149}
150
151EXPORT_SYMBOL_GPL(power_supply_changed);
152EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
153EXPORT_SYMBOL_GPL(power_supply_register);
154EXPORT_SYMBOL_GPL(power_supply_unregister);
155
156/* exported for the APM Power driver, APM emulation */
157EXPORT_SYMBOL_GPL(power_supply_class);
158
159subsys_initcall(power_supply_class_init);
160module_exit(power_supply_class_exit);
161
162MODULE_DESCRIPTION("Universal power supply monitor class");
163MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
164 "Szabolcs Gyurko, "
165 "Anton Vorontsov <cbou@mail.ru>");
166MODULE_LICENSE("GPL");