*
* 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; version 2 of the License.
+ * 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
#define ao_spi_fast(b)
#endif
+#if !HAS_COMPANION
+#error HAS_COMPANION not set in ao_companion.c
+#endif
+
#define COMPANION_SELECT() do { \
ao_spi_get_bit(AO_COMPANION_CS_PORT, \
AO_COMPANION_CS_PIN, \