1 files changed, 81 insertions, 0 deletions
diff --git a/app/include/zmk/event_manager.h b/app/include/zmk/event_manager.h
new file mode 100644
index 0000000..31c5322
--- /dev/null
+++ b/app/include/zmk/event_manager.h
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#pragma once
+
+#include <stddef.h>
+#include <kernel.h>
+#include <zephyr/types.h>
+
+struct zmk_event_type {
+    const char *name;
+};
+
+struct zmk_event_header {
+    const struct zmk_event_type *event;
+    uint8_t last_listener_index;
+};
+
+#define ZMK_EV_EVENT_HANDLED 1
+#define ZMK_EV_EVENT_CAPTURED 2
+
+typedef int (*zmk_listener_callback_t)(const struct zmk_event_header *eh);
+struct zmk_listener {
+    zmk_listener_callback_t callback;
+};
+
+struct zmk_event_subscription {
+    const struct zmk_event_type *event_type;
+    const struct zmk_listener *listener;
+};
+
+#define ZMK_EVENT_DECLARE(event_type)                                                              \
+    struct event_type *new_##event_type();                                                         \
+    bool is_##event_type(const struct zmk_event_header *eh);                                       \
+    struct event_type *cast_##event_type(const struct zmk_event_header *eh);                       \
+    extern const struct zmk_event_type zmk_event_##event_type;
+
+#define ZMK_EVENT_IMPL(event_type)                                                                 \
+    const struct zmk_event_type zmk_event_##event_type = {.name = STRINGIFY(event_type)};          \
+    const struct zmk_event_type *zmk_event_ref_##event_type __used                                 \
+        __attribute__((__section__(".event_type"))) = &zmk_event_##event_type;                     \
+    struct event_type *new_##event_type() {                                                        \
+        struct event_type *ev = (struct event_type *)k_malloc(sizeof(struct event_type));          \
+        ev->header.event = &zmk_event_##event_type;                                                \
+        return ev;                                                                                 \
+    };                                                                                             \
+    bool is_##event_type(const struct zmk_event_header *eh) {                                      \
+        return eh->event == &zmk_event_##event_type;                                               \
+    };                                                                                             \
+    struct event_type *cast_##event_type(const struct zmk_event_header *eh) {                      \
+        return (struct event_type *)eh;                                                            \
+    };
+
+#define ZMK_LISTENER(mod, cb) const struct zmk_listener zmk_listener_##mod = {.callback = cb};
+
+#define ZMK_SUBSCRIPTION(mod, ev_type)                                                             \
+    const Z_DECL_ALIGN(struct zmk_event_subscription)                                              \
+        _CONCAT(_CONCAT(zmk_event_sub_, mod), ev_type) __used                                      \
+        __attribute__((__section__(".event_subscription"))) = {                                    \
+            .event_type = &zmk_event_##ev_type,                                                    \
+            .listener = &zmk_listener_##mod,                                                       \
+    };
+
+#define ZMK_EVENT_RAISE(ev) zmk_event_manager_raise((struct zmk_event_header *)ev);
+
+#define ZMK_EVENT_RAISE_AFTER(ev, mod)                                                             \
+    zmk_event_manager_raise_after((struct zmk_event_header *)ev, &zmk_listener_##mod);
+
+#define ZMK_EVENT_RAISE_AT(ev, mod)                                                                \
+    zmk_event_manager_raise_at((struct zmk_event_header *)ev, &zmk_listener_##mod);
+
+#define ZMK_EVENT_RELEASE(ev) zmk_event_manager_release((struct zmk_event_header *)ev);
+
+int zmk_event_manager_raise(struct zmk_event_header *event);
+int zmk_event_manager_raise_after(struct zmk_event_header *event,
+                                  const struct zmk_listener *listener);
+int zmk_event_manager_raise_at(struct zmk_event_header *event, const struct zmk_listener *listener);
+int zmk_event_manager_release(struct zmk_event_header *event);