HID: multitouch: handle external buttons for Precision Touchpads

BugLink: https://bugs.launchpad.net/bugs/1708372

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>
(cherry picked from commit 594312b8)
Signed-off-by: AceLan Kao <acelan.kao@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Po-Hsu Lin <po-hsu.lin@canonical.com>
Acked-by: Marcelo Cerri <marcelo.cerri@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

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;