linux-kernel - Re: [PATCH 2/7] power_supply: Add charger control properties

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Message-ID: <20121119005021.GM29066@lizard.sbx05977.paloaca.wayport.net>
Date:	Sun, 18 Nov 2012 16:50:21 -0800
From:	Anton Vorontsov <cbouatmailru@...il.com>
To:	Jenny TC <jenny.tc@...el.com>
Cc:	linux-kernel@...r.kernel.org,
	Pallala Ramakrishna <ramakrishna.pallala@...el.com>,
	Chanwoo Choi <cw00.choi@...sung.com>, myungjoo.ham@...sung.com
Subject: Re: [PATCH 2/7] power_supply: Add charger control properties

On Thu, Oct 18, 2012 at 10:14:01PM +0530, Jenny TC wrote:
> The battery charger needs to have control path along
> with the reporting charger properties. In existing solutions
> this is implemented using regulator framework. A regulator
> framework doesn't fit a charger driver requirement because of the
> following reason
> Charger needs support two paths - charger path (charger to platform)
> and charging (charger to battery).Disabling the charging path alone
> (eg over battery temperature) will allow the platform to work with
> power from charger without discharging the battery. And the charger
> may need to be disabled completely based on the charger temperature
> or the platform temperature.
> Charger has more than one pair of voltage/current to control (CC,CV,INLMT)
> These features will not directly fit in the regulator framework
> 
> Since the charger driver sits in the power supply subsystem it make sense
> to add the properties to control the charger.
> 
> Also this patch adds/modify the power supply properties to meet the
> requirements for charger control
> 
> Signed-off-by: Jenny TC <jenny.tc@...el.com>
> ---
>  drivers/power/power_supply_sysfs.c |   16 ++++++++++++----
>  include/linux/power_supply.h       |   24 ++++++++++++++++--------
>  2 files changed, 28 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/power/power_supply_sysfs.c b/drivers/power/power_supply_sysfs.c
> index 40fa3b7..3166d00 100644
> --- a/drivers/power/power_supply_sysfs.c
> +++ b/drivers/power/power_supply_sysfs.c
> @@ -160,12 +160,13 @@ static struct device_attribute power_supply_attrs[] = {
>  	POWER_SUPPLY_ATTR(charge_now),
>  	POWER_SUPPLY_ATTR(charge_avg),
>  	POWER_SUPPLY_ATTR(charge_counter),
> -	POWER_SUPPLY_ATTR(constant_charge_current),
> -	POWER_SUPPLY_ATTR(constant_charge_current_max),
> -	POWER_SUPPLY_ATTR(constant_charge_voltage),
> -	POWER_SUPPLY_ATTR(constant_charge_voltage_max),

Sorry, but you can't just remove properites like this. They're already
used by a lot of drivers.

Thanks,
Anton.
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