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/slab.h>
17 #include <linux/device.h>
18 #include <linux/err.h>
19 #include <linux/power_supply.h>
20 #include "power_supply.h"
22 /* exported for the APM Power driver, APM emulation */
23 struct class *power_supply_class;
24 EXPORT_SYMBOL_GPL(power_supply_class);
26 static struct device_type power_supply_dev_type;
28 static int __power_supply_changed_work(struct device *dev, void *data)
30 struct power_supply *psy = (struct power_supply *)data;
31 struct power_supply *pst = dev_get_drvdata(dev);
34 for (i = 0; i < psy->num_supplicants; i++)
35 if (!strcmp(psy->supplied_to[i], pst->name)) {
36 if (pst->external_power_changed)
37 pst->external_power_changed(pst);
42 static void power_supply_changed_work(struct work_struct *work)
45 struct power_supply *psy = container_of(work, struct power_supply,
48 dev_dbg(psy->dev, "%s\n", __func__);
50 spin_lock_irqsave(&psy->changed_lock, flags);
53 spin_unlock_irqrestore(&psy->changed_lock, flags);
55 class_for_each_device(power_supply_class, NULL, psy,
56 __power_supply_changed_work);
58 power_supply_update_leds(psy);
60 kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
61 spin_lock_irqsave(&psy->changed_lock, flags);
64 wake_unlock(&psy->work_wake_lock);
65 spin_unlock_irqrestore(&psy->changed_lock, flags);
68 void power_supply_changed(struct power_supply *psy)
72 dev_dbg(psy->dev, "%s\n", __func__);
74 spin_lock_irqsave(&psy->changed_lock, flags);
76 wake_lock(&psy->work_wake_lock);
77 spin_unlock_irqrestore(&psy->changed_lock, flags);
78 schedule_work(&psy->changed_work);
80 EXPORT_SYMBOL_GPL(power_supply_changed);
82 static int __power_supply_am_i_supplied(struct device *dev, void *data)
84 union power_supply_propval ret = {0,};
85 struct power_supply *psy = (struct power_supply *)data;
86 struct power_supply *epsy = dev_get_drvdata(dev);
89 for (i = 0; i < epsy->num_supplicants; i++) {
90 if (!strcmp(epsy->supplied_to[i], psy->name)) {
91 if (epsy->get_property(epsy,
92 POWER_SUPPLY_PROP_ONLINE, &ret))
101 int power_supply_am_i_supplied(struct power_supply *psy)
105 error = class_for_each_device(power_supply_class, NULL, psy,
106 __power_supply_am_i_supplied);
108 dev_dbg(psy->dev, "%s %d\n", __func__, error);
112 EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
114 static int __power_supply_is_system_supplied(struct device *dev, void *data)
116 union power_supply_propval ret = {0,};
117 struct power_supply *psy = dev_get_drvdata(dev);
119 if (psy->type != POWER_SUPPLY_TYPE_BATTERY) {
120 if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret))
128 int power_supply_is_system_supplied(void)
132 error = class_for_each_device(power_supply_class, NULL, NULL,
133 __power_supply_is_system_supplied);
137 EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
139 int power_supply_set_battery_charged(struct power_supply *psy)
141 if (psy->type == POWER_SUPPLY_TYPE_BATTERY && psy->set_charged) {
142 psy->set_charged(psy);
148 EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
150 static int power_supply_match_device_by_name(struct device *dev, void *data)
152 const char *name = data;
153 struct power_supply *psy = dev_get_drvdata(dev);
155 return strcmp(psy->name, name) == 0;
158 struct power_supply *power_supply_get_by_name(char *name)
160 struct device *dev = class_find_device(power_supply_class, NULL, name,
161 power_supply_match_device_by_name);
163 return dev ? dev_get_drvdata(dev) : NULL;
165 EXPORT_SYMBOL_GPL(power_supply_get_by_name);
167 static void power_supply_dev_release(struct device *dev)
169 pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
173 int power_supply_register(struct device *parent, struct power_supply *psy)
178 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
182 device_initialize(dev);
184 dev->class = power_supply_class;
185 dev->type = &power_supply_dev_type;
186 dev->parent = parent;
187 dev->release = power_supply_dev_release;
188 dev_set_drvdata(dev, psy);
191 INIT_WORK(&psy->changed_work, power_supply_changed_work);
193 rc = kobject_set_name(&dev->kobj, "%s", psy->name);
195 goto kobject_set_name_failed;
197 rc = device_add(dev);
199 goto device_add_failed;
201 spin_lock_init(&psy->changed_lock);
202 wake_lock_init(&psy->work_wake_lock, WAKE_LOCK_SUSPEND, "power-supply");
204 rc = power_supply_create_triggers(psy);
206 goto create_triggers_failed;
208 power_supply_changed(psy);
212 create_triggers_failed:
213 wake_lock_destroy(&psy->work_wake_lock);
215 kobject_set_name_failed:
221 EXPORT_SYMBOL_GPL(power_supply_register);
223 void power_supply_unregister(struct power_supply *psy)
225 cancel_work_sync(&psy->changed_work);
226 power_supply_remove_triggers(psy);
227 wake_lock_destroy(&psy->work_wake_lock);
228 device_unregister(psy->dev);
230 EXPORT_SYMBOL_GPL(power_supply_unregister);
232 static int __init power_supply_class_init(void)
234 power_supply_class = class_create(THIS_MODULE, "power_supply");
236 if (IS_ERR(power_supply_class))
237 return PTR_ERR(power_supply_class);
239 power_supply_class->dev_uevent = power_supply_uevent;
240 power_supply_init_attrs(&power_supply_dev_type);
245 static void __exit power_supply_class_exit(void)
247 class_destroy(power_supply_class);
250 subsys_initcall(power_supply_class_init);
251 module_exit(power_supply_class_exit);
253 MODULE_DESCRIPTION("Universal power supply monitor class");
254 MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
256 "Anton Vorontsov <cbou@mail.ru>");
257 MODULE_LICENSE("GPL");