linux-kernel - Re: [PATCH] lis3lv02d: add axes knowledge of HP Pavilion dv5 models

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Message-ID: <cb7bb73a0902101448h74b6b73j8307c65c4f006152@mail.gmail.com>
Date:	Tue, 10 Feb 2009 23:48:14 +0100
From:	Giuseppe Bilotta <giuseppe.bilotta@...il.com>
To:	Pavel Machek <pavel@...e.cz>
Cc:	"?ric Piel" <eric.piel@...mplin-utc.net>,
	linux-kernel@...r.kernel.org, Palatis Tseng <palatis@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] lis3lv02d: add axes knowledge of HP Pavilion dv5 models

On Tue, Feb 10, 2009 at 10:39 PM, Giuseppe Bilotta
<giuseppe.bilotta@...il.com> wrote:
> On Tue, Feb 10, 2009 at 11:10 AM, Pavel Machek <pavel@...e.cz> wrote:
>>
>> Yeah, that patch. Not sure what to do next... you could grab lis3
>> manual and see if you can setup chip by hand to get better results...
>
> As Eric pointed out, it looks definitely like an endianness problem,
> although there are a few strange things which are happening at the
> same time. Is the lis3 manual available online somewhere, or can I
> request it to the mfgr?

'k, found it on the STMicroelectronics website. Reading the doc about
LIS3LV02DL I see that WHO_AM_I should return 3Ah, but my sensor
returns 3Bh. I'll see if I find the correct datasheet for this one
instead, it might have info about the differences.

One thing that I noticed is that (modulo axis inversion) I'm able to
use the sensor correctly if I set the thing to only use the high byte,
totally discarding the lower byte:
	return *((s8*)(&hi));
Maybe this sensor needs a different setup to return 12 instead of 8
bits of information.

-- 
Giuseppe "Oblomov" Bilotta
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