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path: root/drivers/power/power_supply_core.c
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Diffstat (limited to 'drivers/power/power_supply_core.c')
-rw-r--r--drivers/power/power_supply_core.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
index 557af943b2f5..26606641fe44 100644
--- a/drivers/power/power_supply_core.c
+++ b/drivers/power/power_supply_core.c
@@ -15,6 +15,7 @@
#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>
@@ -24,6 +25,9 @@
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;
static bool __power_supply_is_supplied_by(struct power_supply *supplier,
@@ -80,6 +84,8 @@ static void power_supply_changed_work(struct work_struct *work)
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);
}
@@ -335,6 +341,32 @@ struct power_supply *power_supply_get_by_name(const char *name)
}
EXPORT_SYMBOL_GPL(power_supply_get_by_name);
+#ifdef CONFIG_OF
+static int power_supply_match_device_node(struct device *dev, const void *data)
+{
+ return dev->parent && dev->parent->of_node == data;
+}
+
+struct power_supply *power_supply_get_by_phandle(struct device_node *np,
+ const char *property)
+{
+ struct device_node *power_supply_np;
+ struct device *dev;
+
+ power_supply_np = of_parse_phandle(np, property, 0);
+ if (!power_supply_np)
+ return ERR_PTR(-ENODEV);
+
+ dev = class_find_device(power_supply_class, NULL, power_supply_np,
+ power_supply_match_device_node);
+
+ of_node_put(power_supply_np);
+
+ return dev ? dev_get_drvdata(dev) : NULL;
+}
+EXPORT_SYMBOL_GPL(power_supply_get_by_phandle);
+#endif /* CONFIG_OF */
+
int power_supply_powers(struct power_supply *psy, struct device *dev)
{
return sysfs_create_link(&psy->dev->kobj, &dev->kobj, "powers");
@@ -347,6 +379,18 @@ static void power_supply_dev_release(struct device *dev)
kfree(dev);
}
+int power_supply_reg_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_register(&power_supply_notifier, nb);
+}
+EXPORT_SYMBOL_GPL(power_supply_reg_notifier);
+
+void power_supply_unreg_notifier(struct notifier_block *nb)
+{
+ atomic_notifier_chain_unregister(&power_supply_notifier, nb);
+}
+EXPORT_SYMBOL_GPL(power_supply_unreg_notifier);
+
#ifdef CONFIG_THERMAL
static int power_supply_read_temp(struct thermal_zone_device *tzd,
unsigned long *temp)

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