167 lines
3.8 KiB
C
167 lines
3.8 KiB
C
/*
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* Universal power supply monitor class
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*
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* Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
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* Copyright © 2004 Szabolcs Gyurko
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* Copyright © 2003 Ian Molton <spyro@f2s.com>
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*
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* Modified: 2004, Oct Szabolcs Gyurko
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*
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* You may use this code as per GPL version 2
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/power_supply.h>
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#include "power_supply.h"
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struct class *power_supply_class;
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static int __power_supply_changed_work(struct device *dev, void *data)
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{
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struct power_supply *psy = (struct power_supply *)data;
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struct power_supply *pst = dev_get_drvdata(dev);
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int i;
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for (i = 0; i < psy->num_supplicants; i++)
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if (!strcmp(psy->supplied_to[i], pst->name)) {
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if (pst->external_power_changed)
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pst->external_power_changed(pst);
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}
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return 0;
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}
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static void power_supply_changed_work(struct work_struct *work)
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{
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struct power_supply *psy = container_of(work, struct power_supply,
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changed_work);
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dev_dbg(psy->dev, "%s\n", __FUNCTION__);
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class_for_each_device(power_supply_class, psy,
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__power_supply_changed_work);
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power_supply_update_leds(psy);
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kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
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}
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void power_supply_changed(struct power_supply *psy)
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{
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dev_dbg(psy->dev, "%s\n", __FUNCTION__);
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schedule_work(&psy->changed_work);
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}
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static int __power_supply_am_i_supplied(struct device *dev, void *data)
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{
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union power_supply_propval ret = {0,};
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struct power_supply *psy = (struct power_supply *)data;
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struct power_supply *epsy = dev_get_drvdata(dev);
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int i;
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for (i = 0; i < epsy->num_supplicants; i++) {
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if (!strcmp(epsy->supplied_to[i], psy->name)) {
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if (epsy->get_property(epsy,
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POWER_SUPPLY_PROP_ONLINE, &ret))
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continue;
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if (ret.intval)
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return ret.intval;
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}
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}
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return 0;
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}
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int power_supply_am_i_supplied(struct power_supply *psy)
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{
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int error;
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error = class_for_each_device(power_supply_class, psy,
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__power_supply_am_i_supplied);
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dev_dbg(psy->dev, "%s %d\n", __FUNCTION__, error);
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return error;
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}
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int power_supply_register(struct device *parent, struct power_supply *psy)
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{
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int rc = 0;
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psy->dev = device_create(power_supply_class, parent, 0,
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"%s", psy->name);
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if (IS_ERR(psy->dev)) {
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rc = PTR_ERR(psy->dev);
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goto dev_create_failed;
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}
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dev_set_drvdata(psy->dev, psy);
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INIT_WORK(&psy->changed_work, power_supply_changed_work);
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rc = power_supply_create_attrs(psy);
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if (rc)
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goto create_attrs_failed;
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rc = power_supply_create_triggers(psy);
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if (rc)
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goto create_triggers_failed;
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power_supply_changed(psy);
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goto success;
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create_triggers_failed:
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power_supply_remove_attrs(psy);
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create_attrs_failed:
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device_unregister(psy->dev);
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dev_create_failed:
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success:
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return rc;
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}
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void power_supply_unregister(struct power_supply *psy)
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{
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flush_scheduled_work();
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power_supply_remove_triggers(psy);
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power_supply_remove_attrs(psy);
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device_unregister(psy->dev);
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}
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static int __init power_supply_class_init(void)
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{
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power_supply_class = class_create(THIS_MODULE, "power_supply");
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if (IS_ERR(power_supply_class))
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return PTR_ERR(power_supply_class);
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power_supply_class->dev_uevent = power_supply_uevent;
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return 0;
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}
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static void __exit power_supply_class_exit(void)
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{
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class_destroy(power_supply_class);
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}
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EXPORT_SYMBOL_GPL(power_supply_changed);
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EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
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EXPORT_SYMBOL_GPL(power_supply_register);
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EXPORT_SYMBOL_GPL(power_supply_unregister);
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/* exported for the APM Power driver, APM emulation */
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EXPORT_SYMBOL_GPL(power_supply_class);
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subsys_initcall(power_supply_class_init);
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module_exit(power_supply_class_exit);
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MODULE_DESCRIPTION("Universal power supply monitor class");
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MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
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"Szabolcs Gyurko, "
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"Anton Vorontsov <cbou@mail.ru>");
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MODULE_LICENSE("GPL");
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