# Re: \[PATCH v2\] Input: spaceball - fix parsing of movement data packets

- From: Dmitry Torokhov \<dmitry.torokhov@gmail.com\>
- Date: 2021-12-31 05:10:48 
- List: linux-input
- Page: https://ratatoskr.run/linux-input/2021/12/1621484
- Thread: https://ratatoskr.run/linux-input/2021/12/1615404/t.md

```text
On Tue, Dec 21, 2021 at 02:16:31AM -0800, Leo L. Schwab wrote:
> The spaceball.c module was not properly parsing the movement reports
> coming from the device.  The code read axis data as signed 16-bit
> little-endian values starting at offset 2.
> 
> In fact, axis data in Spaceball movement reports are signed 16-bit
> big-endian values starting at offset 3.  This was determined first by
> visually inspecting the data packets, and later verified by consulting:
> http://spacemice.org/pdf/SpaceBall_2003-3003_Protocol.pdf
> 
> If this ever worked properly, it was in the time before Git...
> 
> Signed-off-by: Leo L. Schwab <redacted>

Applied, thank you.

-- 
Dmitry
```