linux-kernel - Re: [PATCH 1/1] Input: mma8450 - fix signed 12bits to 32bits conversion

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Date:	Sun, 31 Mar 2013 00:25:06 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Sebastien Royen <sebastien.royen@...il.com>
Cc:	Bill Pemberton <wfp5p@...ginia.edu>, linux-kernel@...r.kernel.org,
	seb <sebastien.royen@...adeus.com>
Subject: Re: [PATCH 1/1] Input: mma8450 - fix signed 12bits to 32bits
 conversion

On Thu, Mar 28, 2013 at 03:16:29PM +0100, Sebastien Royen wrote:
> From: seb <sebastien.royen@...adeus.com>
> 
> Event value is wrong. Should be in range -2048 to 2047, but is in range 0 to 4095.
> Use s8 to int conversion and remove 0xfff mask.
> 
> Signed-off-by: Sebastien Royen <sebastien.royen@...adeus.com>

Applied, thank you Sebastien.

> ---
>  drivers/input/misc/mma8450.c |    6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/input/misc/mma8450.c b/drivers/input/misc/mma8450.c
> index 480557f..f330969 100644
> --- a/drivers/input/misc/mma8450.c
> +++ b/drivers/input/misc/mma8450.c
> @@ -123,9 +123,9 @@ static void mma8450_poll(struct input_polled_dev *dev)
>  	if (ret < 0)
>  		return;
>  
> -	x = ((buf[1] << 4) & 0xff0) | (buf[0] & 0xf);
> -	y = ((buf[3] << 4) & 0xff0) | (buf[2] & 0xf);
> -	z = ((buf[5] << 4) & 0xff0) | (buf[4] & 0xf);
> +	x = ((int)(s8)buf[1] << 4) | (buf[0] & 0xf);
> +	y = ((int)(s8)buf[3] << 4) | (buf[2] & 0xf);
> +	z = ((int)(s8)buf[5] << 4) | (buf[4] & 0xf);
>  
>  	input_report_abs(dev->input, ABS_X, x);
>  	input_report_abs(dev->input, ABS_Y, y);
> -- 
> 1.7.9.5
> 

-- 
Dmitry
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