GPIO, SPI and 64-bit support, platform channel refactor

Makefile

@@ -1,16 +1,16 @@
 CC = cc
 LD = cc
-REAL_CFLAGS = -I./include $(shell pkg-config --cflags gbm libdrm glesv2 egl) -DBUILD_ELM327_PLUGIN -DBUILD_TEST_PLUGIN -ggdb $(CFLAGS)
+REAL_CFLAGS = -I./include $(shell pkg-config --cflags gbm libdrm glesv2 egl) -DBUILD_ELM327_PLUGIN -DBUILD_GPIOD_PLUGIN -DBUILD_SPIDEV_PLUGIN -DBUILD_TEST_PLUGIN -ggdb $(CFLAGS)
 REAL_LDFLAGS = $(shell pkg-config --libs gbm libdrm glesv2 egl) -lrt -lflutter_engine -lpthread -ldl $(LDFLAGS)
 
 SOURCES = src/flutter-pi.c src/platformchannel.c src/pluginregistry.c src/console_keyboard.c \
-	src/plugins/elm327plugin.c src/plugins/services-plugin.c src/plugins/testplugin.c src/plugins/text_input.c \
-	src/plugins/raw_keyboard.c
+	src/plugins/elm327plugin.c src/plugins/services.c src/plugins/testplugin.c src/plugins/text_input.c \
+	src/plugins/raw_keyboard.c src/plugins/gpiod.c src/plugins/spidev.c
 OBJECTS = $(patsubst src/%.c,out/obj/%.o,$(SOURCES))
 
 all: out/flutter-pi
 
-out/obj/%.o: src/%.c
+out/obj/%.o: src/%.c 
 	@mkdir -p $(@D)
 	$(CC) -c $(REAL_CFLAGS) $(REAL_LDFLAGS) $< -o $@
 

include/flutter-pi.h

@@ -9,6 +9,8 @@
 #include <xf86drmMode.h>
 #include <stdint.h>
 #include <flutter_embedder.h>
+#include <stdlib.h>
+#include <string.h>
 
 #define EGL_PLATFORM_GBM_KHR	0x31D7
 
@@ -34,6 +36,8 @@ typedef enum {
 	kVBlankRequest,
 	kVBlankReply,
 	kUpdateOrientation,
+	kSendPlatformMessage,
+	kRespondToPlatformMessage,
 	kFlutterTask
 } flutterpi_task_type;
 
@@ -47,11 +51,26 @@ struct flutterpi_task {
 			intptr_t baton;
 		};
 		enum device_orientation orientation;
+		struct {
+			char *channel;
+			const FlutterPlatformMessageResponseHandle *responsehandle;
+			size_t message_size;
+			uint8_t *message;
+		};
 	};
     uint64_t target_time;
 };
 
-void post_platform_task(struct flutterpi_task *task);
+static inline void *memdup(const void *restrict src, const size_t n) {
+	void *__restrict__ dest;
+
+	if ((src == NULL) || (n == 0)) return NULL;
+
+	dest = malloc(n);
+	if (dest == NULL) return NULL;
+
+	return memcpy(dest, src, n);
+}
 
 struct drm_fb {
 	struct gbm_bo *bo;
@@ -111,8 +130,6 @@ struct mousepointer_mtslot {
 
 #define ISSET(uint32bitmap, bit) (uint32bitmap[(bit)/32] & (1 << ((bit) & 0x1F)))
 
-#define STREQ(a, b) (strcmp(a, b) == 0)
-
 struct input_device {
 	char path[PATH_MAX];
 	char name[256];
@@ -147,4 +164,15 @@ extern struct mousepointer_mtslot mousepointer;
 
 extern FlutterEngine engine;
 
+void post_platform_task(struct flutterpi_task *task);
+
+int flutterpi_send_platform_message(const char *channel,
+									const uint8_t *restrict message,
+									size_t message_size,
+									FlutterPlatformMessageResponseHandle *responsehandle);
+
+int flutterpi_respond_to_platform_message(FlutterPlatformMessageResponseHandle *handle,
+										  const uint8_t *restrict message,
+										  size_t message_size);
+
 #endif