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)
44 struct power_supply *psy = container_of(work, struct power_supply,
47 dev_dbg(psy->dev, "%s\n", __func__);
49 class_for_each_device(power_supply_class, NULL, psy,
50 __power_supply_changed_work);
52 power_supply_update_leds(psy);
54 kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
57 void power_supply_changed(struct power_supply *psy)
59 dev_dbg(psy->dev, "%s\n", __func__);
61 schedule_work(&psy->changed_work);
63 EXPORT_SYMBOL_GPL(power_supply_changed);
65 static int __power_supply_am_i_supplied(struct device *dev, void *data)
67 union power_supply_propval ret = {0,};
68 struct power_supply *psy = (struct power_supply *)data;
69 struct power_supply *epsy = dev_get_drvdata(dev);
72 for (i = 0; i < epsy->num_supplicants; i++) {
73 if (!strcmp(epsy->supplied_to[i], psy->name)) {
74 if (epsy->get_property(epsy,
75 POWER_SUPPLY_PROP_ONLINE, &ret))
84 int power_supply_am_i_supplied(struct power_supply *psy)
88 error = class_for_each_device(power_supply_class, NULL, psy,
89 __power_supply_am_i_supplied);
91 dev_dbg(psy->dev, "%s %d\n", __func__, error);
95 EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
97 static int __power_supply_is_system_supplied(struct device *dev, void *data)
99 union power_supply_propval ret = {0,};
100 struct power_supply *psy = dev_get_drvdata(dev);
102 if (psy->type != POWER_SUPPLY_TYPE_BATTERY) {
103 if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret))
111 int power_supply_is_system_supplied(void)
115 error = class_for_each_device(power_supply_class, NULL, NULL,
116 __power_supply_is_system_supplied);
120 EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
122 int power_supply_set_battery_charged(struct power_supply *psy)
124 if (psy->type == POWER_SUPPLY_TYPE_BATTERY && psy->set_charged) {
125 psy->set_charged(psy);
131 EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
133 static int power_supply_match_device_by_name(struct device *dev, void *data)
135 const char *name = data;
136 struct power_supply *psy = dev_get_drvdata(dev);
138 return strcmp(psy->name, name) == 0;
141 struct power_supply *power_supply_get_by_name(char *name)
143 struct device *dev = class_find_device(power_supply_class, NULL, name,
144 power_supply_match_device_by_name);
146 return dev ? dev_get_drvdata(dev) : NULL;
148 EXPORT_SYMBOL_GPL(power_supply_get_by_name);
150 int power_supply_powers(struct power_supply *psy, struct device *dev)
152 return sysfs_create_link_nowarn(&psy->dev->kobj, &dev->kobj, "powers");
154 EXPORT_SYMBOL_GPL(power_supply_powers);
156 static void power_supply_dev_release(struct device *dev)
158 pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
162 int power_supply_register(struct device *parent, struct power_supply *psy)
167 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
171 device_initialize(dev);
173 dev->class = power_supply_class;
174 dev->type = &power_supply_dev_type;
175 dev->parent = parent;
176 dev->release = power_supply_dev_release;
177 dev_set_drvdata(dev, psy);
180 INIT_WORK(&psy->changed_work, power_supply_changed_work);
182 rc = kobject_set_name(&dev->kobj, "%s", psy->name);
184 goto kobject_set_name_failed;
186 rc = device_add(dev);
188 goto device_add_failed;
190 rc = power_supply_create_triggers(psy);
192 goto create_triggers_failed;
194 power_supply_changed(psy);
198 create_triggers_failed:
200 kobject_set_name_failed:
206 EXPORT_SYMBOL_GPL(power_supply_register);
208 void power_supply_unregister(struct power_supply *psy)
210 cancel_work_sync(&psy->changed_work);
211 sysfs_remove_link(&psy->dev->kobj, "powers");
212 power_supply_remove_triggers(psy);
213 device_unregister(psy->dev);
215 EXPORT_SYMBOL_GPL(power_supply_unregister);
217 static int __init power_supply_class_init(void)
219 power_supply_class = class_create(THIS_MODULE, "power_supply");
221 if (IS_ERR(power_supply_class))
222 return PTR_ERR(power_supply_class);
224 power_supply_class->dev_uevent = power_supply_uevent;
225 power_supply_init_attrs(&power_supply_dev_type);
230 static void __exit power_supply_class_exit(void)
232 class_destroy(power_supply_class);
235 subsys_initcall(power_supply_class_init);
236 module_exit(power_supply_class_exit);
238 MODULE_DESCRIPTION("Universal power supply monitor class");
239 MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
241 "Anton Vorontsov <cbou@mail.ru>");
242 MODULE_LICENSE("GPL");