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.
Cc: [email protected] Signed-off-by: Aaron Ma <[email protected]> --- 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
