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Subject[PATCH] Input: trackpoint - force 3 buttons if 0 button is reported
Date
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: stable@vger.kernel.org
Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
---
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
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