linux-kernel - Re: Fwd: [PATCH] bq27x00

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Date:	Mon, 31 Jan 2011 16:46:26 +0100
From:	Rodolfo Giometti <giometti@...eenne.com>
To:	Anton Vorontsov <cbouatmailru@...il.com>
Cc:	Grazvydas Ignotas <notasas@...il.com>,
	linux-kernel@...r.kernel.org,
	Pali Rohár <pali.rohar@...il.com>
Subject: Re: Fwd: [PATCH] bq27x00_battery: Some fixes

On Mon, Jan 31, 2011 at 04:54:17PM +0300, Anton Vorontsov wrote:
> The same is for this patch.
> 
> Comments, Reviewed-by or Acked-by?
> 
> p.s. FWIW, I already asked Pali to factor out bq27x00_battery_time()
>      fix to a separate patch.
> 
> ----- Forwarded message from Pali Rohár <pali.rohar@...il.com> -----
> 
> Date: Wed, 26 Jan 2011 21:42:39 +0100
> From: Pali Rohár <pali.rohar@...il.com>
> To: Anton Vorontsov <cbouatmailru@...il.com>
> Cc: David Woodhouse <dwmw2@...radead.org>
> Subject: Re: [PATCH] bq27x00_battery
> 
> This patch fix reporting correct (devided by resistor sense) values on
> bq27000/bq27200 batteries.
> 
> Signed-off-by: Pali Rohár <pali.rohar@...il.com>
> Tested-by: Pali Rohár <pali.rohar@...il.com>
> 
> --- a/drivers/power/bq27x00_battery.c	2011-01-26 21:30:40.000000000 +0100
> +++ b/drivers/power/bq27x00_battery.c	2011-01-26 21:32:34.000000000 +0100
> @@ -37,10 +37,11 @@
>  #define BQ27x00_REG_TTF			0x18
>  #define BQ27x00_REG_TTECP		0x26
> 
> +#define BQ27000_RS			20 /* Resistor sense */
>  #define BQ27000_REG_RSOC		0x0B /* Relative State-of-Charge */
>  #define BQ27000_FLAG_CHGS		BIT(7)
> 
> -#define BQ27500_REG_SOC			0x2c
> +#define BQ27500_REG_SOC			0x2C
>  #define BQ27500_FLAG_DSC		BIT(0)
>  #define BQ27500_FLAG_FC			BIT(9)
> 
> @@ -112,7 +113,7 @@ static int bq27x00_battery_temperature(s
>  }
> 
>  /*
> - * Return the battery Voltage in milivolts
> + * Return the battery Voltage in µV
>   * Or < 0 if something fails.
>   */
>  static int bq27x00_battery_voltage(struct bq27x00_device_info *di)
> @@ -130,7 +131,7 @@ static int bq27x00_battery_voltage(struc
>  }

Ok, but I think we should change the function name adding _mV...

> 
>  /*
> - * Return the battery average current
> + * Return the battery average current in µA
>   * Note that current can be negative signed as well
>   * Or 0 if something fails.
>   */
> @@ -149,6 +150,7 @@ static int bq27x00_battery_current(struc
>  	if (di->chip == BQ27500) {
>  		/* bq27500 returns signed value */
>  		curr = (int)(s16)curr;
> +		curr *= 1000;
>  	} else {
>  		ret = bq27x00_read(BQ27x00_REG_FLAGS, &flags, 0, di);
>  		if (ret < 0) {
> @@ -159,9 +161,10 @@ static int bq27x00_battery_current(struc
>  			dev_dbg(di->dev, "negative current!\n");
>  			curr = -curr;
>  		}
> +		curr = curr * 3570 / BQ27000_RS;
>  	}
> 
> -	return curr * 1000;
> +	return curr;
>  }

And here _mA.

>  /*
> @@ -233,7 +236,7 @@ static int bq27x00_battery_time(struct b
>  	}
> 
>  	if (tval == 65535)
> -		return -ENODATA;
> +		tval = 0;
> 
>  	val->intval = tval * 60;
>  	return 0;
> 
> ----- End forwarded message -----

Ciao,

Rodolfo

-- 

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Linux Device Driver                          giometti@...ux.it
Embedded Systems                     phone:  +39 349 2432127
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