/*
* 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/notifier.h>
#include <linux/err.h>
#include <linux/power_supply.h>
#include <linux/thermal.h>
#include "power_supply.h"
/* exported for the APM Power driver, APM emulation */
struct class *power_supply_class;
EXPORT_SYMBOL_GPL(power_supply_class);
ATOMIC_NOTIFIER_HEAD(power_supply_notifier);
EXPORT_SYMBOL_GPL(power_supply_notifier);
static struct device_type power_supply_dev_type;
#define POWER_SUPPLY_DEFERRED_REGISTER_TIME msecs_to_jiffies(10)
static bool __power_supply_is_supplied_by(struct power_supply *supplier,
struct power_supply *supply)
{
int i;
if (!supply->supplied_from && !supplier->supplied_to)
return false;
/* Support both supplied_to and supplied_from modes */
if (supply->supplied_from) {
if (!supplier->desc->name)
return false;
for (i = 0; i < supply->num_supplies; i++)
if (!strcmp(supplier->desc->name, supply->supplied_from[i]))
return true;
} else {
if (!supply->desc->name)
return false;
for (i = 0; i < supplier->num_supplicants; i++)
if (!strcmp(supplier->supplied_to[i], supply->desc->name))
return true;
}
return false;
}
static int __power_supply_changed_work(struct device *dev, void *data)
{
struct power_supply *psy = data;
struct power_supply *pst = dev_get_drvdata(dev);
if (__power_supply_is_supplied_by(psy, pst)) {
if (pst->desc->external_power_changed)
pst->desc->external_power_changed(pst);
}
return 0;
}
static void power_supply_changed_work(struct work_struct *work)
{
unsigned long flags;
struct power_supply *psy = container_of(work, struct power_supply,
changed_work);
dev_dbg(&psy->dev, "%s\n", __func__);
spin_lock_irqsave(&psy->changed_lock, flags);
/*
* Check 'changed' here to avoid issues due to race between
* power_supply_changed() and this routine. In worst case
* power_supply_changed() can be called again just before we take above
* lock. During the first call of this routine we will mark 'changed' as
* false and it will stay false for the next call as well.
*/
if (likely(psy->changed)) {
psy->changed = false;
spin_unlock_irqrestore(&psy->changed_lock, flags);
class_for_each_device(power_supply_class, NULL, psy,
__power_supply_changed_work);
power_supply_update_leds(psy);
atomic_notifier_call_chain(&power_supply_notifier,
PSY_EVENT_PROP_CHANGED, psy);
kobject_uevent(&psy->dev.kobj, KOBJ_CHANGE);
spin_lock_irqsave(&psy->changed_lock, flags);
}
/*
* Hold the wakeup_source until all events are processed.
* power_supply_changed() might have called again and have set 'changed'
* to true.
*/
if (likely(!psy->changed))
pm_relax(&psy->dev);
spin_unlock_irqrestore(&psy->changed_lock, flags);
}
void power_supply_changed(struct power_supply *psy)
{
unsigned long flags;
dev_dbg(&psy->dev, "%s\n", __func__);
spin_lock_irqsave(&psy->changed_lock, flags);
psy->changed = true;
pm_stay_awake(&psy->dev);
spin_unlock_irqrestore(&psy->changed_lock, flags);
schedule_work(&psy->changed_work);
}
EXPORT_SYMBOL_GPL(power_supply_changed);
/*
* Notify that power supply was registered after parent finished the probing.
*
* Often power supply is registered from driver's probe function. However
* calling power_supply_changed() directly from power_supply_register()
* would lead to execution of get_property() function provided by the driver
* too early - before the probe ends.
*
* Avoid that by waiting on parent's mutex.
*/
static void power_supply_deferred_register_work(struct work_struct *work)
{
struct power_supply *psy = container_of(work, struct power_supply,
deferred_register_work.work);
if (psy->dev.parent)
mutex_lock(&psy->dev.parent->mutex);
power_supply_changed(psy);
if (psy->dev.parent)
mutex_unlock(&psy->dev.parent->mutex);
}
#ifdef CONFIG_OF
#include <linux/of.h>
static int __power_supply_populate_supplied_from(struct device *dev,
void *data)
{
struct power_supply *psy = data;
struct power_supply *epsy = dev_get_drvdata(