linux-kernel - RE: [PATCH 1/3] power: core: Add generic interface to get battery specification.

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Date:	Mon, 10 Nov 2014 03:41:04 +0000
From:	"Tc, Jenny" <jenny.tc@...el.com>
To:	"jonghwa3.lee@...sung.com" <jonghwa3.lee@...sung.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"sre@...nel.org" <sre@...nel.org>,
	"dbaryshkov@...il.com" <dbaryshkov@...il.com>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"anton@...msg.org" <anton@...msg.org>,
	"pavel@....cz" <pavel@....cz>
Subject: RE: [PATCH 1/3] power: core: Add generic interface to get battery
 specification.

> 
> >> +ATOMIC_NOTIFIER_HEAD(psy_battery_info_notifier);
> >
> >  Isn't it good to reuse the existing power_supply_notifier for this?
> >
> >> +enum battery_info_notifier_events {
> >> +	PSY_BATT_INFO_REGISTERED,
> >> +	PSY_BATT_INFO_UNREGISTERED,
> >> +};
> >
> > If we use the power_supply_notifier, then this can be moved to
> > enum power_supply_notifier_events
> >
> 
> 
> It doesn't use power_supply_notifier, rather than it uses newly introduced
> notifier for battery information. Intention of making of new notifier block here
> is to extinguish event from power_supply_changed which might be noisy for
> battery information consumer. However, If it looks wasteful code, it's not a big
> deal to use existed power_supply_notifier.

Using the power_supply_notifier helps to get all power supply notifications
(power_supply_chnaged, battery info register/unregister, ..) using a single notifier. The
consumers can ignore the unwanted events.