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-rw-r--r--drivers/hid/hid-multitouch.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 89e9032ab1e7..6dca66806844 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -565,6 +565,14 @@ 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;
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