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power: Add devm_power_supply_get_by_phandle() helper function

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This commit adds a resource-managed version of the
power_supply_get_by_phandle() function.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
This commit is contained in:
Hans de Goede 2015-06-09 23:37:56 +02:00 committed by Sebastian Reichel
parent a6e6b63ee2
commit fe27e1dfe9
2 changed files with 44 additions and 0 deletions
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39
drivers/power/power_supply_core.c
View File

@ -446,6 +446,45 @@ struct power_supply *power_supply_get_by_phandle(struct device_node *np,
return psy;
}
EXPORT_SYMBOL_GPL(power_supply_get_by_phandle);
static void devm_power_supply_put(struct device *dev, void *res)
{
struct power_supply **psy = res;
power_supply_put(*psy);
}
/**
* devm_power_supply_get_by_phandle() - Resource managed version of
* power_supply_get_by_phandle()
* @dev: Pointer to device holding phandle property
* @phandle_name: Name of property holding a power supply phandle
*
* Return: On success returns a reference to a power supply with
* matching name equals to value under @property, NULL or ERR_PTR otherwise.
*/
struct power_supply *devm_power_supply_get_by_phandle(struct device *dev,
const char *property)
{
struct power_supply **ptr, *psy;
if (!dev->of_node)
return ERR_PTR(-ENODEV);
ptr = devres_alloc(devm_power_supply_put, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
return ERR_PTR(-ENOMEM);
psy = power_supply_get_by_phandle(dev->of_node, property);
if (IS_ERR_OR_NULL(psy)) {
devres_free(ptr);
} else {
*ptr = psy;
devres_add(dev, ptr);
}
return psy;
}
EXPORT_SYMBOL_GPL(devm_power_supply_get_by_phandle);
#endif /* CONFIG_OF */
int power_supply_get_property(struct power_supply *psy,

5
include/linux/power_supply.h
View File

@ -292,10 +292,15 @@ extern void power_supply_put(struct power_supply *psy);
#ifdef CONFIG_OF
extern struct power_supply *power_supply_get_by_phandle(struct device_node *np,
const char *property);
extern struct power_supply *devm_power_supply_get_by_phandle(
struct device *dev, const char *property);
#else /* !CONFIG_OF */
static inline struct power_supply *
power_supply_get_by_phandle(struct device_node *np, const char *property)
{ return NULL; }
static inline struct power_supply *
devm_power_supply_get_by_phandle(struct device *dev, const char *property)
{ return NULL; }
#endif /* CONFIG_OF */
extern void power_supply_changed(struct power_supply *psy);
extern int power_supply_am_i_supplied(struct power_supply *psy);