On Fri, Jan 12, 2018 at 02:46:58PM +0800, Aaron Ma wrote:
> Lenovo introduced trackpoint compatible sticks with minimum PS/2 commands.
> Some of these sticks with 3 buttons always return 0 when reading
> extended button info, set it as 3 buttons to enable middle button.
Does it only happen with newer ELan/ALPS/NXP trackpoints, or also with
trackpoints advertising the original 0x010E version? What devices
respond with 0 as button info?
>
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Aaron Ma <aaron.ma@xxxxxxxxxxxxx>
> ---
> drivers/input/mouse/trackpoint.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/input/mouse/trackpoint.c b/drivers/input/mouse/trackpoint.c
> index 0871010f18d5..00c0d1706567 100644
> --- a/drivers/input/mouse/trackpoint.c
> +++ b/drivers/input/mouse/trackpoint.c
> @@ -383,6 +383,10 @@ int trackpoint_detect(struct psmouse *psmouse, bool set_properties)
> if (trackpoint_read(ps2dev, TP_EXT_BTN, &button_info)) {
> psmouse_warn(psmouse, "failed to get extended button data, assuming 3 buttons\n");
> button_info = 0x33;
> + } else if (!button_info) {
> + psmouse_warn(psmouse,
> + "got no extended button data, assuming 3 buttons\n");
> + button_info = 0x33;
> }
>
> psmouse->private = kzalloc(sizeof(struct trackpoint_data), GFP_KERNEL);
> --
> 2.14.3
>
--
Dmitry
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