linux-kernel - Re: [PATCH v2] power_supply: Added support for power supply attribute sources

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Date:	Thu, 26 Jul 2012 10:04:11 -0700
From:	Anton Vorontsov <cbouatmailru@...il.com>
To:	Ramakrishna Pallala <ramakrishna.pallala@...el.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] power_supply: Added support for power supply
 attribute sources

Hello Ramakrishna,

On Thu, Jul 26, 2012 at 08:47:24PM +0530, Ramakrishna Pallala wrote:
> On some platforms one driver(or HW chip) may not be able to provide all
> the necessary attributes of the power supply connected to the platform or
> may provide very limited info which can be used by core/primary drivers.
> 
> For example a temperature sensor chip placed near the battery can be used
> to report battery ambient temperature but it does not makes sense to register
> sensor driver with power supply class. Or even a ADC driver or platform
> driver may report power supply properties like voltage/current or charging
> status but registering all those driver with power supply class is not a
> practical or ideal approach.
> 
> This patch adds the generic support to register the drivers as power
> supply attribute(properties) sources and adds an interface to read
> these attributes from power supply class drivers.
> 
> If there are multiple attribute sources of the same type then caller has
> to do source selection by passing the source string in the query struct.
> 
> Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@...el.com>
> ---
[...]
> +extern int power_supply_attributes_register(struct device *parent,
> +				struct power_supply_attr_source *psy_attr);

Can you please show some user of the new calls? If I understand
correctly, you're going to call these from sensing (ADC, or some
other) drivers, which would be very very wrong thing to do.

Thanks,

-- 
Anton Vorontsov
Email: cbouatmailru@...il.com
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