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power_supply: Add function to return system-wide power state 

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>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
This commit is contained in:
Matthew Garrett 2008-08-26 21:09:59 +01:00 committed by Anton Vorontsov
parent e82374fd1a
commit 942ed16194
2 changed files with 31 additions and 0 deletions
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25
drivers/power/power_supply_core.c
View File

@ -87,6 +87,30 @@ int power_supply_am_i_supplied(struct power_supply *psy)
return error; 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(void)
{
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 power_supply_register(struct device *parent, struct power_supply *psy)
{ {
int rc = 0; int rc = 0;
@ -148,6 +172,7 @@ static void __exit power_supply_class_exit(void)
EXPORT_SYMBOL_GPL(power_supply_changed); EXPORT_SYMBOL_GPL(power_supply_changed);
EXPORT_SYMBOL_GPL(power_supply_am_i_supplied); 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_register);
EXPORT_SYMBOL_GPL(power_supply_unregister); EXPORT_SYMBOL_GPL(power_supply_unregister);

6
include/linux/power_supply.h
View File

@ -165,6 +165,12 @@ struct power_supply_info {
extern void power_supply_changed(struct power_supply *psy); extern void power_supply_changed(struct power_supply *psy);
extern int power_supply_am_i_supplied(struct power_supply *psy); extern int power_supply_am_i_supplied(struct power_supply *psy);
#if defined(CONFIG_POWER_SUPPLY) || defined(CONFIG_POWER_SUPPLY_MODULE)
extern int power_supply_is_system_supplied(void);
#else
static inline int power_supply_is_system_supplied(void) { return -ENOSYS; }
#endif
extern int power_supply_register(struct device *parent, extern int power_supply_register(struct device *parent,
struct power_supply *psy); struct power_supply *psy);
extern void power_supply_unregister(struct power_supply *psy); extern void power_supply_unregister(struct power_supply *psy);