puzzle bus message routing functions

7 files changed, 165 insertions, 24 deletions

diff --git a/lib/pbdrv/CMakeLists.txt b/lib/pbdrv/CMakeLists.txt
index ce77d43..b048ec7 100644
--- a/lib/pbdrv/CMakeLists.txt
+++ b/lib/pbdrv/CMakeLists.txt
@@ -25,6 +25,7 @@ target_include_directories(pbdrv SYSTEM INTERFACE .)
 add_library(pbdrv-mod STATIC
 	pb-mod.c
 	pb-send.c
+	pb-route.c
 	)
 target_link_libraries(pbdrv-mod pbdrv)
 target_include_directories(pbdrv-mod SYSTEM INTERFACE .)
diff --git a/lib/pbdrv/pb-mod.c b/lib/pbdrv/pb-mod.c
index b5626d3..faa321e 100644
--- a/lib/pbdrv/pb-mod.c
+++ b/lib/pbdrv/pb-mod.c
@@ -1,5 +1,8 @@
+#include "pb-buf.h"
+#include "pb-msg.h"
 #include "pb-types.h"
-#include "pb.h"
+#include "pb-mod.h"
+#include "pb-route.h"
 
 //! fallback module name
 __weak const char * PB_MOD_NAME = "???";
@@ -7,9 +10,6 @@ __weak const char * PB_MOD_NAME = "???";
 //! [private] placeholder global state variable
 static pb_global_state_t _global_state = PB_GS_NOINIT;
 
-// //! [private] main controller global state
-// static pb_global_state_t _main_state = PB_GS_NOINIT;
-
 __weak pb_global_state_t pb_hook_mod_state_read() {
 	return _global_state;
 }
@@ -18,9 +18,21 @@ __weak void pb_hook_mod_state_write(pb_global_state_t state) {
 	_global_state = state;
 }
 
-__weak void pb_i2c_recv(const uint8_t * buf, size_t sz) {
-	return;
+__weak void pb_i2c_recv(const uint8_t * data, size_t sz) {
+	pb_buf_t buf = {
+		.data = (char *) data,
+		.size = sz,
+	};
+	pb_msg_t * msg = pb_msg_read(&buf);
+	if (msg == NULL) return; // invalid message
+	if (msg->cmd == NULL) return; // invalid message
+	
+	pb_route_msg(msg);
+
+	pb_msg_free(msg);
+}
+
+void pb_reply(pb_msg_t * msg, pb_buf_t * reply) {
+	return pb_i2c_send(msg->sender, (uint8_t *) reply->data, reply->size);
 }
- 
-// __weak void pb_hook_main_state_update(pb_global_state_t state) { }
 
diff --git a/lib/pbdrv/pb-mod.h b/lib/pbdrv/pb-mod.h
index 7dfc945..4fb3456 100644
--- a/lib/pbdrv/pb-mod.h
+++ b/lib/pbdrv/pb-mod.h
@@ -14,6 +14,7 @@
 #include <stddef.h>
 #include <stdbool.h>
 
+#include "pb-buf.h"
 #include "pb-types.h"
 
 #ifdef __cplusplus
@@ -28,6 +29,8 @@ extern const i2c_addr_t PB_MOD_ADDR;
 void pb_i2c_recv(const uint8_t * buf, size_t sz);
 void pb_i2c_send(i2c_addr_t i2c_addr, const uint8_t * buf, size_t sz);
 
+void pb_reply(pb_msg_t * msg, pb_buf_t * reply);
+
 pb_global_state_t pb_hook_mod_state_read();
 void pb_hook_mod_state_write(pb_global_state_t state);
 
diff --git a/lib/pbdrv/pb-route.c b/lib/pbdrv/pb-route.c
new file mode 100644
index 0000000..f26d45c
--- /dev/null
+++ b/lib/pbdrv/pb-route.c
@@ -0,0 +1,86 @@
+#include "pb-route.h"
+#include "pb-mod.h"
+#include "pb-send.h"
+
+__weak bool pb_hook_route_msg(pb_msg_t * msg) { return false; }
+__weak void pb_route_msg(pb_msg_t * msg) {
+	if (pb_hook_route_msg(msg)) return;
+
+	switch (msg->type) {
+		case PB_CMD_PROP: return pb_route_cmd_prop(msg);
+		case PB_CMD_STATE: return pb_route_cmd_state(msg);
+		case PB_CMD_MAGIC: return pb_route_cmd_magic(msg);
+		default: return;
+	}
+}
+
+__weak bool pb_hook_route_cmd_prop(pb_msg_t * msg) { return false; }
+__weak void pb_route_cmd_prop(pb_msg_t * msg) {
+	if (pb_hook_route_cmd_prop(msg)) return;
+
+	switch (msg->action) {
+		case PB_ACTION_REQ: return pb_route_cmd_prop_req(msg);
+		case PB_ACTION_RES: return pb_route_cmd_prop_res(msg);
+		case PB_ACTION_SET: return pb_route_cmd_prop_set(msg);
+		default: return;
+	}
+}
+
+__weak bool pb_hook_route_cmd_state(pb_msg_t * msg) { return false; }
+__weak void pb_route_cmd_state(pb_msg_t * msg) {
+	if (pb_hook_route_cmd_state(msg)) return;
+
+	switch (msg->action) {
+		case PB_ACTION_REQ: return pb_route_cmd_state_req(msg);
+		case PB_ACTION_RES: return pb_route_cmd_state_res(msg);
+		case PB_ACTION_SET: return pb_route_cmd_state_set(msg);
+		default: return;
+	}
+}
+
+__weak bool pb_hook_route_cmd_magic(pb_msg_t * msg) { return false; }
+__weak void pb_route_cmd_magic(pb_msg_t * msg) {
+	if (pb_hook_route_cmd_magic(msg)) return;
+
+	switch (msg->action) {
+		case PB_ACTION_REQ: return pb_route_cmd_magic_req(msg);
+		case PB_ACTION_RES: return pb_route_cmd_magic_res(msg);
+		default: return;
+	}
+}
+
+// all properties are user-defined
+__weak void pb_route_cmd_prop_req(pb_msg_t * msg) {}
+__weak void pb_route_cmd_prop_res(pb_msg_t * msg) {}
+__weak void pb_route_cmd_prop_set(pb_msg_t * msg) {}
+
+static pb_global_state_t _main_state = PB_GS_NOINIT;
+__weak void pb_hook_main_state_update(pb_global_state_t state) {}
+__weak void pb_route_cmd_state_req(pb_msg_t * msg) {
+	pb_global_state_t own_state = pb_hook_mod_state_read();
+	pb_buf_t buf = pb_send_state_res(own_state);
+	pb_reply(msg, &buf);
+	pb_buf_free(&buf);
+
+	// notify of new global state variable
+	pb_cmd_state_t * cmd = msg->cmd;
+	if (cmd->state != _main_state)
+		pb_hook_main_state_update(cmd->state);
+	_main_state = cmd->state;
+}
+
+__weak void pb_route_cmd_state_res(pb_msg_t * msg) {}
+
+__weak void pb_route_cmd_state_set(pb_msg_t * msg) {
+	pb_cmd_state_t * cmd = msg->cmd;
+	pb_hook_mod_state_write(cmd->state);
+}
+
+__weak void pb_route_cmd_magic_req(pb_msg_t * msg) {
+	pb_buf_t buf = pb_send_magic_res();
+	pb_reply(msg, &buf);
+	pb_buf_free(&buf);
+}
+
+__weak void pb_route_cmd_magic_res(pb_msg_t * msg) { }
+
diff --git a/lib/pbdrv/pb-route.h b/lib/pbdrv/pb-route.h
new file mode 100644
index 0000000..aa65057
--- /dev/null
+++ b/lib/pbdrv/pb-route.h
@@ -0,0 +1,39 @@
+#pragma once
+
+#include <stdbool.h>
+
+#include "pb-types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void pb_route_msg(pb_msg_t * msg);
+
+bool pb_hook_route_msg(pb_msg_t * msg);
+
+void pb_route_cmd_prop(pb_msg_t * msg);
+void pb_route_cmd_state(pb_msg_t * msg);
+void pb_route_cmd_magic(pb_msg_t * msg);
+
+bool pb_hook_route_cmd_prop(pb_msg_t * msg);
+bool pb_hook_route_cmd_state(pb_msg_t * msg);
+bool pb_hook_route_cmd_magic(pb_msg_t * msg);
+
+void pb_route_cmd_prop_req(pb_msg_t * msg);
+void pb_route_cmd_prop_res(pb_msg_t * msg);
+void pb_route_cmd_prop_set(pb_msg_t * msg);
+
+void pb_route_cmd_state_req(pb_msg_t * msg);
+void pb_route_cmd_state_res(pb_msg_t * msg);
+void pb_route_cmd_state_set(pb_msg_t * msg);
+
+void pb_hook_main_state_update(pb_global_state_t state);
+
+void pb_route_cmd_magic_req(pb_msg_t * msg);
+void pb_route_cmd_magic_res(pb_msg_t * msg);
+
+#ifdef __cplusplus
+}
+#endif
+
diff --git a/lib/pbdrv/pb-send.c b/lib/pbdrv/pb-send.c
index 09a35a8..f0d5004 100644
--- a/lib/pbdrv/pb-send.c
+++ b/lib/pbdrv/pb-send.c
@@ -2,7 +2,7 @@
 #include "pb-mod.h"
 #include "pb-msg.h"
 
-pb_buf_t pb_send_req_read(uint8_t propid) {
+pb_buf_t pb_send_read_req(uint8_t propid) {
 	pb_cmd_prop_t cmd = {
 		.propid = propid,
 		.value = NULL,
@@ -17,7 +17,7 @@ pb_buf_t pb_send_req_read(uint8_t propid) {
 	return pb_msg_write(&msg);
 }
 
-pb_buf_t pb_send_res_read(uint8_t propid, uint8_t * value, size_t size) {
+pb_buf_t pb_send_read_res(uint8_t propid, uint8_t * value, size_t size) {
 	pb_cmd_prop_t cmd = {
 		.propid = propid,
 		.value = value,
@@ -32,7 +32,7 @@ pb_buf_t pb_send_res_read(uint8_t propid, uint8_t * value, size_t size) {
 	return pb_msg_write(&msg);
 }
 
-pb_buf_t pb_send_req_write(uint8_t propid, uint8_t * value, size_t size) {
+pb_buf_t pb_send_write_req(uint8_t propid, uint8_t * value, size_t size) {
 	pb_cmd_prop_t cmd = {
 		.propid = propid,
 		.value = value,
@@ -47,7 +47,7 @@ pb_buf_t pb_send_req_write(uint8_t propid, uint8_t * value, size_t size) {
 	return pb_msg_write(&msg);
 }
 
-pb_buf_t pb_send_req_state() {
+pb_buf_t pb_send_state_req() {
 	pb_cmd_state_t cmd = {
 		.state = pb_hook_mod_state_read(),
 	};
@@ -60,7 +60,7 @@ pb_buf_t pb_send_req_state() {
 	return pb_msg_write(&msg);
 }
 
-pb_buf_t pb_send_res_state(pb_global_state_t state) {
+pb_buf_t pb_send_state_res(pb_global_state_t state) {
 	pb_cmd_state_t cmd = {
 		.state = state,
 	};
@@ -73,7 +73,7 @@ pb_buf_t pb_send_res_state(pb_global_state_t state) {
 	return pb_msg_write(&msg);
 }
 
-pb_buf_t pb_send_req_set_state(pb_global_state_t state) {
+pb_buf_t pb_send_state_set(pb_global_state_t state) {
 	pb_cmd_state_t cmd = {
 		.state = state,
 	};
@@ -86,7 +86,7 @@ pb_buf_t pb_send_req_set_state(pb_global_state_t state) {
 	return pb_msg_write(&msg);
 }
 
-pb_buf_t pb_send_req_magic() {
+pb_buf_t pb_send_magic_req() {
 	pb_cmd_magic_t cmd = {
 		.magic = (char *) &pb_cmd_magic_req[0],
 		._magic_size = sizeof(pb_cmd_magic_req),
@@ -100,7 +100,7 @@ pb_buf_t pb_send_req_magic() {
 	return pb_msg_write(&msg);
 }
 
-pb_buf_t pb_send_res_magic() {
+pb_buf_t pb_send_magic_res() {
 	pb_cmd_magic_t cmd = {
 		.magic = (char *) &pb_cmd_magic_res[0],
 		._magic_size = sizeof(pb_cmd_magic_res),
diff --git a/lib/pbdrv/pb-send.h b/lib/pbdrv/pb-send.h
index fff9956..83051e2 100644
--- a/lib/pbdrv/pb-send.h
+++ b/lib/pbdrv/pb-send.h
@@ -7,14 +7,14 @@
 extern "C" {
 #endif
 
-pb_buf_t pb_send_req_read(uint8_t propid);
-pb_buf_t pb_send_res_read(uint8_t propid, uint8_t * value, size_t size);
-pb_buf_t pb_send_req_write(uint8_t propid, uint8_t * value, size_t size);
-pb_buf_t pb_send_req_state();
-pb_buf_t pb_send_res_state(pb_global_state_t state);
-pb_buf_t pb_send_req_set_state(pb_global_state_t state);
-pb_buf_t pb_send_req_magic();
-pb_buf_t pb_send_res_magic();
+pb_buf_t pb_send_read_req(uint8_t propid);
+pb_buf_t pb_send_read_res(uint8_t propid, uint8_t * value, size_t size);
+pb_buf_t pb_send_write_req(uint8_t propid, uint8_t * value, size_t size);
+pb_buf_t pb_send_state_req();
+pb_buf_t pb_send_state_res(pb_global_state_t state);
+pb_buf_t pb_send_state_set(pb_global_state_t state);
+pb_buf_t pb_send_magic_req();
+pb_buf_t pb_send_magic_res();
 
 #ifdef __cplusplus
 }