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From:   Saravana Kannan <saravanak@google.com>
Date:   Thu, 27 Feb 2020 18:54:16 -0800
Message-ID: <CAGETcx9695=uVkSmtym36t6jbFXcEGf2JPVqWBi+sLZNG4xzSg@mail.gmail.com>
Subject: Re: [PATCH] power: supply: Allow charger manager can be built as a module
To:     Orson Zhai <orsonzhai@gmail.com>
Cc:     Baolin Wang <baolin.wang7@gmail.com>, sre@kernel.org,
        Linux PM <linux-pm@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Lyra Zhang <zhang.lyra@gmail.com>,
        Android Kernel Team <kernel-team@android.com>
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On Thu, Feb 27, 2020 at 8:06 AM Orson Zhai <orsonzhai@gmail.com> wrote:
>
> Hi Sebastian and other guys here,
>
> On Tue, Feb 11, 2020 at 4:51 PM Baolin Wang <baolin.wang7@gmail.com> wrote:
> >
> > Allow charger manager can be built as a module like other charger
> > drivers.
> >
> What do you think about this patch?
> We want to set charger-manager as module in our project for new Android devices.
>
> -Orson
>
> > Signed-off-by: Baolin Wang <baolin.wang7@gmail.com>
> > ---
> >  drivers/power/supply/Kconfig          |    2 +-
> >  include/linux/power/charger-manager.h |    7 +------
> >  2 files changed, 2 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
> > index 9a5591a..195bc04 100644
> > --- a/drivers/power/supply/Kconfig
> > +++ b/drivers/power/supply/Kconfig
> > @@ -480,7 +480,7 @@ config CHARGER_GPIO
> >           called gpio-charger.
> >
> >  config CHARGER_MANAGER
> > -       bool "Battery charger manager for multiple chargers"
> > +       tristate "Battery charger manager for multiple chargers"
> >         depends on REGULATOR
> >         select EXTCON
> >         help
> > diff --git a/include/linux/power/charger-manager.h b/include/linux/power/charger-manager.h
> > index ad19e68..40493b2 100644
> > --- a/include/linux/power/charger-manager.h
> > +++ b/include/linux/power/charger-manager.h
> > @@ -248,11 +248,6 @@ struct charger_manager {
> >         u64 charging_end_time;
> >  };
> >
> > -#ifdef CONFIG_CHARGER_MANAGER
> >  extern void cm_notify_event(struct power_supply *psy,
> > -                               enum cm_event_types type, char *msg);
> > -#else
> > -static inline void cm_notify_event(struct power_supply *psy,
> > -                               enum cm_event_types type, char *msg) { }
> > -#endif
> > +                           enum cm_event_types type, char *msg);
> >  #endif /* _CHARGER_MANAGER_H */

You are breaking the kernel if CONFIG_CHARGER_MANAGER is disabled. Why
not simple change the #ifdef to
#if IS_ENABLED(CONFIG_CHARGER_MANAGER)
?

-Saravana