linux-kernel - Re: [PATCH] power: bq20z75: Fix time and temp units

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Date:	Wed, 09 Mar 2011 11:00:39 -0800
From:	Rhyland Klein <rklein@...dia.com>
To:	Benson Leung <bleung@...omium.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"cbouatmailru@...il.com" <cbouatmailru@...il.com>
Subject: Re: [PATCH] power: bq20z75: Fix time and temp units

On Sun, 2011-02-27 at 17:41 -0800, Benson Leung wrote:
> Corrected temperature and time to empty/full conversions.
> Temperature is in 0.1°C, time is in seconds.
> 
> Corrected units in comment. "Convert to µWh."
> 
> Signed-off-by: Benson Leung <bleung@...omium.org>
> ---
>  drivers/power/bq20z75.c |   18 ++++++++++++------
>  1 files changed, 12 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/power/bq20z75.c b/drivers/power/bq20z75.c
> index 4141775..123e169 100644
> --- a/drivers/power/bq20z75.c
> +++ b/drivers/power/bq20z75.c
> @@ -269,12 +269,15 @@ static void  bq20z75_unit_adjustment(struct i2c_client *client,
>  {
>  #define BASE_UNIT_CONVERSION		1000
>  #define BATTERY_MODE_CAP_MULT_WATT	(10 * BASE_UNIT_CONVERSION)
> -#define TIME_UNIT_CONVERSION		600
> -#define TEMP_KELVIN_TO_CELCIUS		2731
> +#define TIME_UNIT_CONVERSION		60
> +#define TEMP_KELVIN_TO_CELSIUS		2731
>  	switch (psp) {
>  	case POWER_SUPPLY_PROP_ENERGY_NOW:
>  	case POWER_SUPPLY_PROP_ENERGY_FULL:
>  	case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
> +		/* bq20z75 provides energy in units of 10mWh.
> +		 * Convert to µWh
> +		 */
>  		val->intval *= BATTERY_MODE_CAP_MULT_WATT;
>  		break;
>  
> @@ -288,14 +291,17 @@ static void  bq20z75_unit_adjustment(struct i2c_client *client,
>  		break;
>  
>  	case POWER_SUPPLY_PROP_TEMP:
> -		/* bq20z75 provides battery tempreture in 0.1°K
> -		 * so convert it to 0.1°C */
> -		val->intval -= TEMP_KELVIN_TO_CELCIUS;
> -		val->intval *= 10;
> +		/* bq20z75 provides battery temperature in 0.1K
> +		 * so convert it to 0.1°C
> +		 */
> +		val->intval -= TEMP_KELVIN_TO_CELSIUS;
>  		break;
>  
>  	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
>  	case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
> +		/* bq20z75 provides time to empty and time to full in minutes.
> +		 * Convert to seconds
> +		 */
>  		val->intval *= TIME_UNIT_CONVERSION;
>  		break;
>  

LGTM

Acked-by: Rhyland Klein <rklein@...dia.com>


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