mts-io: clean up accessory card support

	use custom kernel config option MTS_NUM_ACCESSORY_PORTS to find out how many slots exist
	(mostly) dynamically handle any number of accessory cards
	streamline code to make it easier to add accessory cards in the future

1 files changed, 20 insertions, 0 deletions

diff --git a/io-module/mts_io.h b/io-module/mts_io.h
index b91423e..ac39463 100644
--- a/io-module/mts_io.h
+++ b/io-module/mts_io.h
@@ -102,5 +102,25 @@ enum {
 	LED_FLASHING,
 };
 
+enum ap {
+	port_1 = 1,
+	port_2,
+};
+
+enum spi_devices {
+	din = 0,
+	dout = 1,
+	adc = 2,
+};
+
+// info for accessory port
+// contains function pointers for setup and teardown and useful info
+// each type of accessory card should have one of these
+struct ap_info {
+	uint8_t product_id;
+	bool (*setup)(enum ap port);
+	bool (*teardown)(enum ap port);
+};
+
 #endif /* ~__MTS_IO_H */