/* * 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) { 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, NULL, 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); } 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); unsigned int *count = data; (*count)++; 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; unsigned int count = 0; error = class_for_each_device(power_supply_class, NULL, &count, __power_supply_is_system_supplied); /* * If no power class device was found at all, most probably we are * running on a desktop system, so assume we are on mains power. */ if (count == 0) return 1; 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); int power_supply_powers(struct power_supply *psy, struct device *dev) { return sysfs_create_link(&psy->dev->kobj, &dev->kobj, "powers"); } EXPORT_SYMBOL_GPL(power_supply_powers); 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; rc = power_supply_create_triggers(psy); if (rc) goto create_triggers_failed; power_supply_changed(psy); goto success; create_triggers_failed: 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); sysfs_remove_link(&psy->dev->kobj, "powers"); power_supply_remove_triggers(psy); 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");