1 files changed, 93 insertions, 0 deletions
diff --git a/include/vag-bap.h b/include/vag-bap.h
new file mode 100644
index 0000000..cf24fd7
--- /dev/null
+++ b/include/vag-bap.h
@@ -0,0 +1,93 @@
+#ifndef __VAG_BAP_H__
+#define __VAG_BAP_H__
+
+#include <linux/can.h>
+
+
+typedef unsigned char BAP_OpCode;
+typedef unsigned char BAP_Node;
+typedef unsigned char BAP_Port;
+typedef unsigned short BAP_FrameLen;
+
+
+/* A BAP frame at the BCL (BAP communication layer) as defined in
+ * http://www.itwissen.info/BCL-BAP-communication-layer.html
+ *
+ * This is basically BAP's equivalent of IP and TCP.
+ */
+struct BAP_Frame {
+	/* True if frame was/will be transmitted in multi-frame syntax */
+	int is_multiframe;
+
+
+	/* Request/reply, kind of */
+	BAP_OpCode opcode;
+
+	/* LSG = Logisches Steuergeraet
+	 * https://www.springerprofessional.de/technische-informatik/eingebettete-systeme/neues-protokoll-vereinfacht-kommunikation-von-steuergeraeten/6592480
+	 *
+	 * BAP's equivalent of an IP address (to be confirmed).
+	 *
+	 * Always the same per CAN ID in the (simple) devices I looked at.
+	 */
+	BAP_Node node;
+
+	/* The "RPC" port, or "status register" ID.
+	 *
+	 * BAP's equivalent of a "UDP port".
+	 */
+	BAP_Port port;
+
+	/* Payload length, up to 2^12-1 = 4095 bytes. */
+	BAP_FrameLen len;
+
+
+	/* Payload */
+	char data[4096];
+};
+
+
+
+struct BAP_RXer {
+	/* Temporary storage for incomplete frames */
+	struct BAP_Frame *mfchannel[8];
+
+	/* How many bytes have we already received on each channel? */
+	BAP_FrameLen len_done[8];
+};
+
+
+struct BAP_TXer {
+	/* Temporary storage for frames not yet fully sent */
+	struct BAP_Frame *slot[4];
+
+	/* How many bytes have we already sent on each channel? */
+	BAP_FrameLen slot_done[4];
+};
+
+
+
+/* BAP frame struct handling */
+struct BAP_Frame* vag_bap_frame_alloc(void);
+             void vag_bap_frame_free(struct BAP_Frame *bap_frame);
+
+int vag_bap_frame_is_valid(struct BAP_Frame *bap_frame);
+
+struct BAP_Frame* vag_bap_frame_clone(struct BAP_Frame *bap_frame);
+
+void vag_bap_frame_dump(struct BAP_Frame *bap_frame);
+
+
+/* BAP reception */
+struct BAP_Frame* vag_bap_handle_can_frame(struct BAP_RXer *bap, struct can_frame *frame);
+struct BAP_RXer* vag_bap_rxer_alloc();
+void vag_bap_rxer_free(struct BAP_RXer *bap);
+
+
+/* BAP transmission */
+int vag_bap_txer_queue(struct BAP_TXer* bap, struct BAP_Frame *bap_frame, struct can_frame *frame);
+struct BAP_TXer* vag_bap_txer_alloc();
+void vag_bap_txer_free(struct BAP_TXer *bap);
+
+
+#endif