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    Subject[PATCH v6 03/22] power_supply: Add driver private data
    Date
    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>
    ---
    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 44c810456212..1c0978f961ea 100644
    --- a/drivers/power/power_supply_core.c
    +++ b/drivers/power/power_supply_core.c
    @@ -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");
    diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
    index f606d6b4bd56..e30d85c0158d 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;
    @@ -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;

    --
    1.9.1


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