summaryrefslogtreecommitdiffstats
path: root/drivers/power/power_supply_core.c
blob: af1633eb3b707c9c53c50e578f0ed5859ee69d96 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
/*
 *  Universal power supply monitor class
 *
 *  Copyright © 2007  Anton Vorontsov <cbou@mail.ru>
 *  Copyright © 2004  Szabolcs Gyurko
 *  Copyright © 2003  Ian Molton <spyro@f2s.com>
 *
 *  Modified: 2004, Oct     Szabolcs Gyurko
 *
 *  You may use this code as per GPL version 2
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/power_supply.h>
#include "power_supply.h"

struct class *power_supply_class;

static int __power_supply_changed_work(struct device *dev, void *data)
{
	struct power_supply *psy = (struct power_supply *)data;
	struct power_supply *pst = dev_get_drvdata(dev);
	int i;

	for (i = 0; i < psy->num_supplicants; i++)
		if (!strcmp(psy->supplied_to[i], pst->name)) {
			if (pst->external_power_changed)
				pst->external_power_changed(pst);
		}
	return 0;
}

static void power_supply_changed_work(struct work_struct *work)
{
	struct power_supply *psy = container_of(work, struct power_supply,
						changed_work);

	dev_dbg(psy->dev, "%s\n", __func__);

	class_for_each_device(power_supply_class, psy,
			      __power_supply_changed_work);

	power_supply_update_leds(psy);

	kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
}

void power_supply_changed(struct power_supply *psy)
{
	dev_dbg(psy->dev, "%s\n", __func__);

	schedule_work(&psy->changed_work);
}

static int __power_supply_am_i_supplied(struct device *dev, void *data)
{
	union power_supply_propval ret = {0,};
	struct power_supply *psy = (struct power_supply *)data;
	struct power_supply *epsy = dev_get_drvdata(dev);
	int i;

	for (i = 0; i < epsy->num_supplicants; i++) {
		if (!strcmp(epsy->supplied_to[i], psy->name)) {
			if (epsy->get_property(epsy,
				  POWER_SUPPLY_PROP_ONLINE, &ret))
				continue;
			if (ret.intval)
				return ret.intval;
		}
	}
	return 0;
}

int power_supply_am_i_supplied(struct power_supply *psy)
{
	int error;

	error = class_for_each_device(power_supply_class, psy,
				      __power_supply_am_i_supplied);

	dev_dbg(psy->dev, "%s %d\n", __func__, error);

	return error;
}

int power_supply_register(struct device *parent, struct power_supply *psy)
{
	int rc = 0;

	psy->dev = device_create_drvdata(power_supply_class, parent, 0,
					 psy, "%s", psy->name);
	if (IS_ERR(psy->dev)) {
		rc = PTR_ERR(psy->dev);
		goto dev_create_failed;
	}

	INIT_WORK(&psy->changed_work, power_supply_changed_work);

	rc = power_supply_create_attrs(psy);
	if (rc)
		goto create_attrs_failed;

	rc = power_supply_create_triggers(psy);
	if (rc)
		goto create_triggers_failed;

	power_supply_changed(psy);

	goto success;

create_triggers_failed:
	power_supply_remove_attrs(psy);
create_attrs_failed:
	device_unregister(psy->dev);
dev_create_failed:
success:
	return rc;
}

void power_supply_unregister(struct power_supply *psy)
{
	flush_scheduled_work();
	power_supply_remove_triggers(psy);
	power_supply_remove_attrs(psy);
	device_unregister(psy->dev);
}

static int __init power_supply_class_init(void)
{
	power_supply_class = class_create(THIS_MODULE, "power_supply");

	if (IS_ERR(power_supply_class))
		return PTR_ERR(power_supply_class);

	power_supply_class->dev_uevent = power_supply_uevent;

	return 0;
}

static void __exit power_supply_class_exit(void)
{
	class_destroy(power_supply_class);
}

EXPORT_SYMBOL_GPL(power_supply_changed);
EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
EXPORT_SYMBOL_GPL(power_supply_register);
EXPORT_SYMBOL_GPL(power_supply_unregister);

/* exported for the APM Power driver, APM emulation */
EXPORT_SYMBOL_GPL(power_supply_class);

subsys_initcall(power_supply_class_init);
module_exit(power_supply_class_exit);

MODULE_DESCRIPTION("Universal power supply monitor class");
MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
	      "Szabolcs Gyurko, "
	      "Anton Vorontsov <cbou@mail.ru>");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud