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: NKrzysztof Kozlowski <k.kozlowski@samsung.com> Reviewed-by: NBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Reviewed-by: NSebastian Reichel <sre@kernel.org> Acked-by: NPavel Machek <pavel@ucw.cz> Signed-off-by: NSebastian Reichel <sre@kernel.org>
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