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 void power_supply_changed_work(struct work_struct *work)
24{
25 struct power_supply *psy = container_of(work, struct power_supply,
26 changed_work);
27 int i;
28
29 dev_dbg(psy->dev, "%s\n", __FUNCTION__);
30
31 for (i = 0; i < psy->num_supplicants; i++) {
32 struct device *dev;
33
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);
37
38 if (!strcmp(psy->supplied_to[i], pst->name)) {
39 if (pst->external_power_changed)
40 pst->external_power_changed(pst);
41 }
42 }
43 up(&power_supply_class->sem);
44 }
45
46 power_supply_update_leds(psy);
47
48 kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
49}
50
51void power_supply_changed(struct power_supply *psy)
52{
53 dev_dbg(psy->dev, "%s\n", __FUNCTION__);
54
55 schedule_work(&psy->changed_work);
56}
57
58int power_supply_am_i_supplied(struct power_supply *psy)
59{
60 union power_supply_propval ret = {0,};
61 struct device *dev;
62
63 down(&power_supply_class->sem);
64 list_for_each_entry(dev, &power_supply_class->devices, node) {
65 struct power_supply *epsy = dev_get_drvdata(dev);
66 int i;
67
68 for (i = 0; i < epsy->num_supplicants; i++) {
69 if (!strcmp(epsy->supplied_to[i], psy->name)) {
70 if (epsy->get_property(epsy,
71 POWER_SUPPLY_PROP_ONLINE, &ret))
72 continue;
73 if (ret.intval)
74 goto out;
75 }
76 }
77 }
78out:
79 up(&power_supply_class->sem);
80
81 dev_dbg(psy->dev, "%s %d\n", __FUNCTION__, ret.intval);
82
83 return ret.intval;
84}
85
86int power_supply_register(struct device *parent, struct power_supply *psy)
87{
88 int rc = 0;
89
90 psy->dev = device_create(power_supply_class, parent, 0,
91 "%s", psy->name);
92 if (IS_ERR(psy->dev)) {
93 rc = PTR_ERR(psy->dev);
94 goto dev_create_failed;
95 }
96
97 dev_set_drvdata(psy->dev, psy);
98
99 INIT_WORK(&psy->changed_work, power_supply_changed_work);
100
101 rc = power_supply_create_attrs(psy);
102 if (rc)
103 goto create_attrs_failed;
104
105 rc = power_supply_create_triggers(psy);
106 if (rc)
107 goto create_triggers_failed;
108
109 power_supply_changed(psy);
110
111 goto success;
112
113create_triggers_failed:
114 power_supply_remove_attrs(psy);
115create_attrs_failed:
116 device_unregister(psy->dev);
117dev_create_failed:
118success:
119 return rc;
120}
121
122void power_supply_unregister(struct power_supply *psy)
123{
124 flush_scheduled_work();
125 power_supply_remove_triggers(psy);
126 power_supply_remove_attrs(psy);
127 device_unregister(psy->dev);
128}
129
130static int __init power_supply_class_init(void)
131{
132 power_supply_class = class_create(THIS_MODULE, "power_supply");
133
134 if (IS_ERR(power_supply_class))
135 return PTR_ERR(power_supply_class);
136
137 power_supply_class->dev_uevent = power_supply_uevent;
138
139 return 0;
140}
141
142static void __exit power_supply_class_exit(void)
143{
144 class_destroy(power_supply_class);
145}
146
147EXPORT_SYMBOL_GPL(power_supply_changed);
148EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
149EXPORT_SYMBOL_GPL(power_supply_register);
150EXPORT_SYMBOL_GPL(power_supply_unregister);
151
152/* exported for the APM Power driver, APM emulation */
153EXPORT_SYMBOL_GPL(power_supply_class);
154
155subsys_initcall(power_supply_class_init);
156module_exit(power_supply_class_exit);
157
158MODULE_DESCRIPTION("Universal power supply monitor class");
159MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
160 "Szabolcs Gyurko, "
161 "Anton Vorontsov <cbou@mail.ru>");
162MODULE_LICENSE("GPL");