/* * 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", __FUNCTION__); 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", __FUNCTION__); 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", __FUNCTION__, error); return error; } int power_supply_register(struct device *parent, struct power_supply *psy) { int rc = 0; psy->dev = device_create(power_supply_class, parent, 0, "%s", psy->name); if (IS_ERR(psy->dev)) { rc = PTR_ERR(psy->dev); goto dev_create_failed; } dev_set_drvdata(psy->dev, psy); 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");