[PATCH v3 01/20] power_supply: Add driver private data

Krzysztof Kozlowski
2015-01-30T14:47:39Z

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>
---
drivers/power/power_supply_core.c | 6 ++++++
include/linux/power_supply.h | 4 ++++
2 files changed, 10 insertions(+)

diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
index 694e8cddd5c1..84ef3f40e7bf 100644
--- a/drivers/power/power_supply_core.c
+++ b/drivers/power/power_supply_core.c
@@ -629,6 +629,12 @@ 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");
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index 096dbced02ac..a5743f24e03e 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -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;
@@ -281,6 +284,7 @@ extern int 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;

--
1.9.1