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| author | Matthew Garrett <mjg59@srcf.ucam.org> | 2008-08-26 21:09:59 +0100 |
|---|---|---|
| committer | Anton Vorontsov <cbouatmailru@gmail.com> | 2008-09-01 02:42:54 +0400 |
| commit | 942ed161944b3476639916cf544e6975b29c985a (patch) | |
| tree | a05e3bd0d6b59de318f3bfc5557502c13dde1bc4 | |
| parent | e82374fd1a804e197fc2a54c3930e70c5d300abc (diff) | |
| download | linux-942ed161944b3476639916cf544e6975b29c985a.tar.gz linux-942ed161944b3476639916cf544e6975b29c985a.tar.bz2 linux-942ed161944b3476639916cf544e6975b29c985a.zip | |
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>
| -rw-r--r-- | drivers/power/power_supply_core.c | 25 | ||||
| -rw-r--r-- | include/linux/power_supply.h | 6 |
2 files changed, 31 insertions, 0 deletions
diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c index cb1ccb472921..f44f5b608f6a 100644 --- a/drivers/power/power_supply_core.c +++ b/drivers/power/power_supply_core.c @@ -87,6 +87,30 @@ 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(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 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_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 ea96ead1d39d..f9348cba6dc1 100644 --- a/include/linux/power_supply.h +++ b/include/linux/power_supply.h @@ -165,6 +165,12 @@ struct power_supply_info { extern void power_supply_changed(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, struct power_supply *psy); extern void power_supply_unregister(struct power_supply *psy); |