Merge branches 'doc', 'multitouch', 'upstream' and 'upstream-fixes' into for-linus
[linux-2.6.git] / drivers / hid / hid-magicmouse.c
index 0ec91c1..a5eda4c 100644 (file)
@@ -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;
        }