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
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
|
/*
* 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/slab.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/power_supply.h>
#include "power_supply.h"
/* exported for the APM Power driver, APM emulation */
struct class *power_supply_class;
EXPORT_SYMBOL_GPL(power_supply_class);
static struct device_type power_supply_dev_type;
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)
{
unsigned long flags;
struct power_supply *psy = container_of(work, struct power_supply,
changed_work);
dev_dbg(psy->dev, "%s\n", __func__);
spin_lock_irqsave(&psy->changed_lock, flags);
if (psy->changed) {
psy->changed = false;
spin_unlock_irqrestore(&psy->changed_lock, flags);
class_for_each_device(power_supply_class, NULL, psy,
__power_supply_changed_work);
power_supply_update_leds(psy);
kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
spin_lock_irqsave(&psy->changed_lock, flags);
}
if (!psy->changed)
wake_unlock(&psy->work_wake_lock);
spin_unlock_irqrestore(&psy->changed_lock, flags);
}
void power_supply_changed(struct power_supply *psy)
{
unsigned long flags;
dev_dbg(psy->dev, "%s\n", __func__);
spin_lock_irqsave(&psy->changed_lock, flags);
psy->changed = true;
wake_lock(&psy->work_wake_lock);
spin_unlock_irqrestore(&psy->changed_lock, flags);
schedule_work(&psy->changed_work);
}
EXPORT_SYMBOL_GPL(power_supply_changed);
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, NULL, psy,
__power_supply_am_i_supplied);
dev_dbg(psy->dev, "%s %d\n", __func__, error);
return error;
}
EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
static int __power_supply_is_system_supplied(struct device *dev, void *data)
{
union power_supply_propval ret = {0,};
struct power_supply *psy = dev_get_drvdata(dev);
if (psy->type != POWER_SUPPLY_TYPE_BATTERY) {
if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret))
return 0;
if (ret.intval)
return ret.intval;
}
return 0;
}
int power_supply_is_system_supplied(void)
{
int error;
error = class_for_each_device(power_supply_class, NULL, NULL,
__power_supply_is_system_supplied);
return error;
}
EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
int power_supply_set_battery_charged(struct power_supply *psy)
{
if (psy->type == POWER_SUPPLY_TYPE_BATTERY && psy->set_charged) {
psy->set_charged(psy);
return 0;
}
return -EINVAL;
}
EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
static int power_supply_match_device_by_name(struct device *dev, void *data)
{
const char *name = data;
struct power_supply *psy = dev_get_drvdata(dev);
return strcmp(psy->name, name) == 0;
}
struct power_supply *power_supply_get_by_name(char *name)
{
struct device *dev = class_find_device(power_supply_class, NULL, name,
power_supply_match_device_by_name);
return dev ? dev_get_drvdata(dev) : NULL;
}
EXPORT_SYMBOL_GPL(power_supply_get_by_name);
static void power_supply_dev_release(struct device *dev)
{
pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
kfree(dev);
}
int power_supply_register(struct device *parent, struct power_supply *psy)
{
struct device *dev;
int rc;
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev)
return -ENOMEM;
device_initialize(dev);
dev->class = power_supply_class;
dev->type = &power_supply_dev_type;
dev->parent = parent;
dev->release = power_supply_dev_release;
dev_set_drvdata(dev, psy);
psy->dev = dev;
INIT_WORK(&psy->changed_work, power_supply_changed_work);
rc = kobject_set_name(&dev->kobj, "%s", psy->name);
if (rc)
goto kobject_set_name_failed;
rc = device_add(dev);
if (rc)
goto device_add_failed;
spin_lock_init(&psy->changed_lock);
wake_lock_init(&psy->work_wake_lock, WAKE_LOCK_SUSPEND, "power-supply");
rc = power_supply_create_triggers(psy);
if (rc)
goto create_triggers_failed;
power_supply_changed(psy);
goto success;
create_triggers_failed:
wake_lock_destroy(&psy->work_wake_lock);
device_del(dev);
kobject_set_name_failed:
device_add_failed:
put_device(dev);
success:
return rc;
}
EXPORT_SYMBOL_GPL(power_supply_register);
void power_supply_unregister(struct power_supply *psy)
{
cancel_work_sync(&psy->changed_work);
power_supply_remove_triggers(psy);
wake_lock_destroy(&psy->work_wake_lock);
device_unregister(psy->dev);
}
EXPORT_SYMBOL_GPL(power_supply_unregister);
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;
power_supply_init_attrs(&power_supply_dev_type);
return 0;
}
static void __exit power_supply_class_exit(void)
{
class_destroy(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");
|
