HID: input mapping for Chicony KU-0418 tactical pad

Chicony KU-0418 (aka Saitek PZ08AU gaming keyboard) has a separate
"tactical pad" with 11 non-functional buttons - they generate usage
codes from 0xff00 (MSVENDOR) usage page. Special case handling for
this keyboard added, so no later clash with MSVENDOR mappings is going
to occur.

Pointed out in bugzilla #7352
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-input.c

@@ -688,7 +688,28 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
 			break;
 
 		case HID_UP_MSVENDOR:
-			goto ignore;
+
+			/* special case - Chicony Chicony KU-0418 tactical pad */
+			if (device->vendor == 0x04f2 && device->product == 0x0418) {
+				set_bit(EV_REP, input->evbit);
+				switch(usage->hid & HID_USAGE) {
+					case 0xff01: map_key_clear(BTN_1);		break;
+					case 0xff02: map_key_clear(BTN_2);		break;
+					case 0xff03: map_key_clear(BTN_3);		break;
+					case 0xff04: map_key_clear(BTN_4);		break;
+					case 0xff05: map_key_clear(BTN_5);		break;
+					case 0xff06: map_key_clear(BTN_6);		break;
+					case 0xff07: map_key_clear(BTN_7);		break;
+					case 0xff08: map_key_clear(BTN_8);		break;
+					case 0xff09: map_key_clear(BTN_9);		break;
+					case 0xff0a: map_key_clear(BTN_A);		break;
+					case 0xff0b: map_key_clear(BTN_B);		break;
+					default:    goto ignore;
+				}
+			} else {
+				goto ignore;
+			}
+			break;
 
 		case HID_UP_CUSTOM: /* Reported on Logitech and Powerbook USB keyboards */