linux-kernel - Re: [PATCH 06/15] twl4030_charger: split uA calculation into a function.

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Message-ID: <20150302210518.GM13270@amd>
Date:	Mon, 2 Mar 2015 22:05:18 +0100
From:	Pavel Machek <pavel@....cz>
To:	NeilBrown <neilb@...e.de>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	Tony Lindgren <tony@...mide.com>,
	Lee Jones <lee.jones@...aro.org>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	GTA04 owners <gta04-owner@...delico.com>,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org
Subject: Re: [PATCH 06/15] twl4030_charger: split uA calculation into a
 function.

On Tue 2015-02-24 15:33:51, NeilBrown wrote:
> We will need this calculation in other places, so
> create functions to map between register value and uA value.
> 
> Signed-off-by: NeilBrown <neilb@...e.de>

Acked-by: Pavel Machek <pavel@....cz>

> +static int regval2ua(int regval, bool cgain)
> +{
> +	if (cgain)
> +		return (regval * 16618 - 8500 * 1000) / 5;
> +	else
> +		return (regval * 16618 - 8500 * 1000) / 10;
> +}

   int res = (regval * 16618 - 8500 * 1000);
   if (cgain)
      return res / 5;
   return res / 10;

?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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