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    Subject[PATCH 1/2] power_supply: get_by_name and set_charged functionality
    Date
    This adds a function to get a power_supply device from the class of
    registered devices by name reference. It can be used to find a specific
    battery to call power_supply_set_battery_charged() on.

    Some battery drivers might need that information to calibrate
    themselves.

    Signed-off-by: Daniel Mack <daniel@caiaq.de>
    Cc: Ian Molton <spyro@f2s.com>
    Cc: Anton Vorontsov <cbou@mail.ru>
    Cc: Matt Reimer <mreimer@vpop.net>
    ---
    drivers/power/power_supply_core.c | 28 ++++++++++++++++++++++++++++
    include/linux/power_supply.h | 3 +++
    2 files changed, 31 insertions(+), 0 deletions(-)

    diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
    index 58f10ac..ddb4800 100644
    --- a/drivers/power/power_supply_core.c
    +++ b/drivers/power/power_supply_core.c
    @@ -117,6 +117,34 @@ int power_supply_is_system_supplied(void)
    }
    EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);

    +int power_supply_set_battery_charged(struct power_supply *psy)
    +{
    + if (psy->type == POWER_SUPPLY_TYPE_BATTERY && psy->set_charged) {
    + psy->set_charged(psy);
    + return 0;
    + }
    +
    + return -EINVAL;
    +}
    +EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
    +
    +static int power_supply_match_device_by_name(struct device *dev, void *data)
    +{
    + const char *name = data;
    + struct power_supply *psy = dev_get_drvdata(dev);
    +
    + return strcmp(psy->name, name) == 0;
    +}
    +
    +struct power_supply *power_supply_get_by_name(char *name)
    +{
    + struct device *dev = class_find_device(power_supply_class, NULL, name,
    + power_supply_match_device_by_name);
    +
    + return dev ? dev_get_drvdata(dev) : NULL;
    +}
    +EXPORT_SYMBOL_GPL(power_supply_get_by_name);
    +
    int power_supply_register(struct device *parent, struct power_supply *psy)
    {
    int rc = 0;
    diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
    index 594c494..49f3296 100644
    --- a/include/linux/power_supply.h
    +++ b/include/linux/power_supply.h
    @@ -126,6 +126,7 @@ struct power_supply {
    enum power_supply_property psp,
    union power_supply_propval *val);
    void (*external_power_changed)(struct power_supply *psy);
    + void (*set_charged)(struct power_supply *psy);

    /* For APM emulation, think legacy userspace. */
    int use_for_apm;
    @@ -165,8 +166,10 @@ struct power_supply_info {
    int use_for_apm;
    };

    +extern struct power_supply *power_supply_get_by_name(char *name);
    extern void power_supply_changed(struct power_supply *psy);
    extern int power_supply_am_i_supplied(struct power_supply *psy);
    +extern int power_supply_set_battery_charged(struct power_supply *psy);

    #if defined(CONFIG_POWER_SUPPLY) || defined(CONFIG_POWER_SUPPLY_MODULE)
    extern int power_supply_is_system_supplied(void);
    --
    1.6.3.1


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