lkml.org 
[lkml]   [2008]   [Aug]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH] power-supply: Add function to return system-wide power state
(resend, I screwed up the Cc)

Certain drivers benefit from knowing whether the system is on ac or
battery, for instance when determining which backlight registers to
read. This adds a simple call to determine whether there's an online
power supply other than any batteries.

Signed-off-by: Matthew Garrett <mjg@redhat.com>

---

The name is a bit odd, but seems to fit in with the existing naming
scheme.

diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
index cb1ccb4..6a687da 100644
--- a/drivers/power/power_supply_core.c
+++ b/drivers/power/power_supply_core.c
@@ -87,6 +87,31 @@ int power_supply_am_i_supplied(struct power_supply *psy)
return error;
}

+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);
+
+ 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()
+{
+ int error;
+
+ error = class_for_each_device(power_supply_class, NULL, NULL,
+ __power_supply_is_system_supplied);
+
+ return error;
+}
+
int power_supply_register(struct device *parent, struct power_supply *psy)
{
int rc = 0;
@@ -148,6 +173,7 @@ static void __exit power_supply_class_exit(void)

EXPORT_SYMBOL_GPL(power_supply_changed);
EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
+EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
EXPORT_SYMBOL_GPL(power_supply_register);
EXPORT_SYMBOL_GPL(power_supply_unregister);

diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index ea96ead..3e67d0c 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -164,6 +164,7 @@ struct power_supply_info {

extern void power_supply_changed(struct power_supply *psy);
extern int power_supply_am_i_supplied(struct power_supply *psy);
+extern int power_supply_is_system_supplied(void);

extern int power_supply_register(struct device *parent,
struct power_supply *psy);
--
Matthew Garrett | mjg59@srcf.ucam.org

\
 
 \ /
  Last update: 2008-08-26 22:13    [W:0.040 / U:1.928 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site