HID: enable dead keys on a belkin wireless keyboard

Belkin Wireless keyboard, model number F8E849KYBD, USB ID 1020:0006,
FCCID: K7SF8E849KYBD emits usages 0x03a-0x03c from Consumer usage page.
As of HUT v1.12, these are marked as reserved. If any conflict arises
later, the mapping could be made conditional on VID/PID.
Signed-off-by: Chris Clayton <chris2553@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-input.c

@@ -431,6 +431,15 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
 				case 0x000: goto ignore;
 				case 0x034: map_key_clear(KEY_SLEEP);		break;
 				case 0x036: map_key_clear(BTN_MISC);		break;
+				/*
+				 * The next three are reported by Belkin wireless
+				 * keyboard (1020:0006). These values are "reserved"
+				 * in HUT 1.12.
+				 */
+				case 0x03a: map_key_clear(KEY_SOUND);           break;
+				case 0x03b: map_key_clear(KEY_CAMERA);          break;
+				case 0x03c: map_key_clear(KEY_DOCUMENTS);       break;
+
 				case 0x040: map_key_clear(KEY_MENU);		break;
 				case 0x045: map_key_clear(KEY_RADIO);		break;