HID: add FF support for Holtek On Line Grip based gamepads

Add force feedback support for Holtek On Line Grip based HID devices.

The protocol is more complex than that of most other rumblepads, but the
device still needs to be handled as a memoryless one.

Tested by Cleber de Mattos Casali with a 1241:5015 "Clone Joypad Super
Power Fire" gamepad, with help from Hendrik Iben <hendrik_iben@web.de>.

Signed-off-by: Anssi Hannula <anssi.hannula@iki.fi>
Tested-by: Cleber de Mattos Casali <clebercasali@yahoo.com.br>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index e8faee4..0c1cafa 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -347,6 +347,9 @@
 #define USB_VENDOR_ID_ILITEK		0x222a
 #define USB_DEVICE_ID_ILITEK_MULTITOUCH	0x0001
 
+#define USB_VENDOR_ID_HOLTEK		0x1241
+#define USB_DEVICE_ID_HOLTEK_ON_LINE_GRIP	0x5015
+
 #define USB_VENDOR_ID_IMATION		0x0718
 #define USB_DEVICE_ID_DISC_STAKKA	0xd000