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diff --git a/keyboards/oddball/optical_sensor/optical_sensor.h b/keyboards/oddball/optical_sensor/optical_sensor.h
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+++ b/keyboards/oddball/optical_sensor/optical_sensor.h
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+/* Copyright 2020 Alexander Tulloh
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* common interface for opitcal sensors */
+
+#if defined ADNS_9800
+    #include "../adns/adns.h"
+    #define config_optical_sensor_t config_adns_t
+    #define report_optical_sensor_t report_adns_t
+    #define optical_sensor_init adns_init
+    #define optical_sensor_get_config adns_get_config
+    #define optical_sensor_set_config adns_set_config
+    #define optical_sensor_get_report adns_get_report
+#elif defined PMW_3360
+    #include "../pmw/pmw.h"
+    #define config_optical_sensor_t config_pmw_t
+    #define report_optical_sensor_t report_pmw_t
+    #define optical_sensor_init pmw_init
+    #define optical_sensor_get_config pmw_get_config
+    #define optical_sensor_set_config pmw_set_config
+    #define optical_sensor_get_report pmw_get_report
+#else
+    /* fallback stub */
+
+    #include <stdint.h>
+
+    typedef struct {
+        uint16_t cpi;
+    } config_optical_sensor_t;
+
+    typedef struct {
+        int16_t x;
+        int16_t y;
+    } report_optical_sensor_t;
+
+    #define optical_sensor_init(){ }
+    #define optical_sensor_get_config() (config_optical_sensor_t){ }
+    #define optical_sensor_set_config(config_optical_sensor_t){ }
+    #define optical_sensor_get_report() (report_optical_sensor_t){ }
+#endif