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power_supply: Add driver private data 

Allow drivers to store private data inside power_supply structure for
later usage in power supply operations.

Usage of driver private data is necessary to access driver's state
container object from power supply calls (like get_property()) if struct
'power_supply' is a stored there as a pointer, for example:

struct some_driver_info {
	struct i2c_client       *client;
	struct power_supply     *power_supply;
	...
}

In such case one cannot use container_of() and must store pointer to
state container as private data.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Reviewed-by: Sebastian Reichel <sre@kernel.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
This commit is contained in:
Krzysztof Kozlowski 2015-03-12 08:44:01 +01:00 committed by Sebastian Reichel
parent 1915a718b1
commit e44ea36439
2 changed files with 10 additions and 0 deletions
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6
drivers/power/power_supply_core.c
View File

@ -674,6 +674,12 @@ void power_supply_unregister(struct power_supply *psy)
}
EXPORT_SYMBOL_GPL(power_supply_unregister);
void *power_supply_get_drvdata(struct power_supply *psy)
{
return psy->drv_data;
}
EXPORT_SYMBOL_GPL(power_supply_get_drvdata);
static int __init power_supply_class_init(void)
{
power_supply_class = class_create(THIS_MODULE, "power_supply");

4
include/linux/power_supply.h
View File

@ -209,6 +209,9 @@ struct power_supply {
/* For APM emulation, think legacy userspace. */
int use_for_apm;
/* Driver private data */
void *drv_data;
/* private */
struct device *dev;
struct work_struct changed_work;
@ -285,6 +288,7 @@ extern int devm_power_supply_register_no_ws(struct device *parent,
extern void power_supply_unregister(struct power_supply *psy);
extern int power_supply_powers(struct power_supply *psy, struct device *dev);
extern void *power_supply_get_drvdata(struct power_supply *psy);
/* For APM emulation, think legacy userspace. */
extern struct class *power_supply_class;