Re: [PATCH v3] power: Make power_supply_am_i_supplied return -ENODEV if there are no suppliers

[Sebastian Reichel <sebastian.reichel@collabora.co.uk>]

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Hi,

On Sun, Apr 16, 2017 at 05:30:31PM +0200, Hans de Goede wrote:
> It is sensible to assume that the hardware actually always has a
> way of charging the battery so when power_supply_am_i_supplied does not
> find any suppliers, that does not mean that there are none, but simply
> that no power_supply-drivers are registered / bound for any suppliers for
> the supply calling power_supply_am_i_supplied.
> 
> At which point a fuel-gauge driver calling power_supply_am_i_supplied()
> cannot determine whether the battery is being charged or not.
> 
> Allow a caller of power_supply_am_i_supplied to differentiate between
> there not being any suppliers, vs no suppliers being online by returning
> -ENODEV if there are no suppliers matching supplied_to / supplied_from,
> which allows fuel-gauge drivers to return POWER_SUPPLY_STATUS_UNKNOWN
> rather then POWER_SUPPLY_STATUS_DISCHARGING if there are no suppliers.
> 
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>

Thanks, queued.

-- Sebastian

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