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Subject: Re: [PATCH v8 5/8] Loongson: YeeLoong: add hardware monitoring
 driver
From:   Wu Zhangjin <wuzhangjin@gmail.com>
Reply-To: wuzhangjin@gmail.com
To:     Pavel Machek <pavel@ucw.cz>
Cc:     Ralf Baechle <ralf@linux-mips.org>, akpm@linux-foundation.org,
        linux-mips@linux-mips.org, linux-kernel@vger.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@gmail.com>,
        "Rafael J . Wysocki" <rjw@sisk.pl>, zhangfx@lemote.com,
        linux-laptop@vger.kernel.org,
        Stephen Rothwell <sfr@canb.auug.org.au>
In-Reply-To: <20091207094909.GD23088@elf.ucw.cz>
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Organization: DSLab, Lanzhou University, China
Date:   Mon, 07 Dec 2009 19:01:03 +0800
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On Mon, 2009-12-07 at 10:49 +0100, Pavel Machek wrote:
> On Mon 2009-12-07 17:41:10, Wu Zhangjin wrote:
> > On Mon, 2009-12-07 at 09:04 +0100, Pavel Machek wrote:
> > > > > What is going on here? I thought the value is already in two's
> > > > > complement... Is the above equivalent of
> > > > > 
> > > > > 	      if (value < 0)
> > > > > 	      	 value = -value; 
> > > > > 
> > > > > ? If so, why? If not, can you add a comment?
> > > > 
> > > > Right, then, will use this instead:
> > > > 
> > > > static int get_battery_current(void)
> > > > { 
> > > > 	s16 value;
> > > > 
> > > > 	value = (ec_read(REG_BAT_CURRENT_HIGH) << 8) |
> > > > 		(ec_read(REG_BAT_CURRENT_LOW));
> > > > 
> > > > 	return abs(value);
> > > > }
> > > 
> > > That's certainly better. But... why not return signed value? Current
> > > flowing from the battery is certainly very different from current
> > > flowing into it...
> > 
> > You are totally right ;)
> > 
> > Just test it, when flowing from the battery, the value is negative, and
> > when flowing into the battery, the value is positive, so, no abs()
> > needed. thanks!
> 
> Make it return -value, then. I believe other code uses >0 values for
> discharge.
> 	

Done, but any document/standard about it?

Regards,
	Wu Zhangjin