HID: multitouch: handle external buttons for Precision Touchpads

According to https://msdn.microsoft.com/en-us/library/windows/hardware/mt604195(v=vs.85).aspx
external buttons have some weird usage mapping:
- Button 2 Indicates Button State for external button for primary
  (default left) clicking.
- Button 3 Indicates Button State for external button for secondary
  (default right) clicking.

So in the current state, the buttons are mapped to right and middle.
Move the usage by one to correctly map the external buttons.

Tested-by: Chris Chiu <chiu@endlessm.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index fb6f1f447279..a65a4c5894a5 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -567,6 +567,14 @@ static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
 
         case HID_UP_BUTTON:
                 code = BTN_MOUSE + ((usage->hid - 1) & HID_USAGE);
+                /*
+                 * MS PTP spec says that external buttons left and right have
+                 * usages 2 and 3.
+                 */
+                if (cls->name == MT_CLS_WIN_8 &&
+                    field->application == HID_DG_TOUCHPAD &&
+                    (usage->hid & HID_USAGE) > 1)
+                        code--;
                 hid_map_usage(hi, usage, bit, max, EV_KEY, code);
                 input_set_capability(hi->input, EV_KEY, code);
                 return 1;