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authorPali Rohár <pali.rohar@gmail.com>2013-11-19 10:18:03 (GMT)
committerAnton Vorontsov <anton@enomsg.org>2013-12-01 22:27:24 (GMT)
commitd36240d26025bec95f3499e2401a56db98d9f01c (patch)
tree345c489dc983fc87cf4927235d9e2361e3e10448 /drivers/power
parent93353e8088057dd988362e6cae727af43734b494 (diff)
downloadlinux-d36240d26025bec95f3499e2401a56db98d9f01c.tar.xz
power_supply: Add power_supply notifier
This patch adds a notifier chain to the power_supply, this helps drivers in other subsystem to listen to changes in power supply subsystem. This would help to take some actions in those drivers on changing the power supply properties. One such scenario is to increase/decrease system performance based on the battery capacity/voltage. Another scenario is to adjust the h/w peak current detection voltage/current thresholds based on battery voltage/capacity. The notifier helps drivers to listen to changes in power_suppy susbystem without polling the power_supply properties Signed-off-by: Jenny TC <jenny.tc@intel.com> Signed-off-by: Pali Rohár <pali.rohar@gmail.com> Acked-by: Jenny TC <jenny.tc@intel.com> Signed-off-by: Anton Vorontsov <anton@enomsg.org>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/power_supply_core.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
index 557af94..6aac23c 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);
}
@@ -347,6 +353,18 @@ 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)