X-Git-Url: http://git.cascardo.info/?a=blobdiff_plain;f=drivers%2Fhid%2Fhid-magicmouse.c;h=a5eda4c8127a274ee20343d26a82383135c3048b;hb=366a2382c68d01638350efcf23d46a47d661c595;hp=0ec91c18a4216a52a4a3c7d85292a22f61a6e828;hpb=e82e6f16a809bc47eb929c3408921def28638fcd;p=cascardo%2Flinux.git

diff --git a/drivers/hid/hid-magicmouse.c b/drivers/hid/hid-magicmouse.c
index 0ec91c18a421..a5eda4c8127a 100644
--- a/drivers/hid/hid-magicmouse.c
+++ b/drivers/hid/hid-magicmouse.c
@@ -501,9 +501,17 @@ static int magicmouse_probe(struct hid_device *hdev,
 	}
 	report->size = 6;
 
+	/*
+	 * The device reponds with 'invalid report id' when feature
+	 * report switching it into multitouch mode is sent to it.
+	 *
+	 * This results in -EIO from the _raw low-level transport callback,
+	 * but there seems to be no other way of switching the mode.
+	 * Thus the super-ugly hacky success check below.
+	 */
 	ret = hdev->hid_output_raw_report(hdev, feature, sizeof(feature),
 			HID_FEATURE_REPORT);
-	if (ret != sizeof(feature)) {
+	if (ret != -EIO) {
 		hid_err(hdev, "unable to request touch data (%d)\n", ret);
 		goto err_stop_hw;
 	}