HID: multitouch: force retrieving of Win8 signature blob

commit 45c5c6828214605eaefa6755c47bd1a2c7eb203e upstream.

The Synaptics 0x11e5 over I2C found in the Asus T100-CHI requires to
fetch the signature blob to actually start sending events.

With this patch, we should be close enough to the Windows driver which
checks the content of the blob at plugin to validate or not the
touchscreen.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=113481
Fixes: 6d4f5440 ("HID: multitouch: Fetch feature reports on demand for Win8 devices")
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 2b8ff18d3713bf21b22878a50a8838e76264d5fa..c5ec4f915594bcb12c3274d919053ca8bcfcadbd 100644 (file)
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -396,6 +396,11 @@ static void mt_feature_mapping(struct hid_device *hdev,
                        td->is_buttonpad = true;
 
                break;
+       case 0xff0000c5:
+               /* Retrieve the Win8 blob once to enable some devices */
+               if (usage->usage_index == 0)
+                       mt_get_feature(hdev, field->report);
+               break;
        }
 }