Initial event manager work, and two first events.

* Add initial event manager implementation,
  roughly mimicking Nordic's API.
* Add `position_state_changed` and
  `keycode_state_changed` events.
* Hook up HID and keymap to new events
  instead of using behaviour global event
  crazy.

app/CMakeLists.txt

@@ -18,11 +18,11 @@ include(cmake/zmk_config.cmake)
 find_package(Zephyr REQUIRED HINTS ../zephyr)
 project(zmk)
 
-
 if(EXISTS ${KEYMAP_DIR}/keymap.c)
   target_sources(app PRIVATE ${KEYMAP_DIR}/keymap.c)
 endif()
 
+zephyr_linker_sources(RODATA include/linker/zmk-events.ld)
 
 # Add your source file to the "app" target. This must come after
 # find_package(Zephyr) which defines the target.
@@ -32,7 +32,9 @@ target_sources(app PRIVATE src/matrix_transform.c)
 target_sources(app PRIVATE src/events.c)
 target_sources(app PRIVATE src/keymap.c)
 target_sources(app PRIVATE src/hid.c)
-target_sources(app PRIVATE src/behaviors/behavior_keymap.c)
+target_sources(app PRIVATE src/event_manager.c)
+target_sources(app PRIVATE src/events/keycode_state_changed.c)
+target_sources(app PRIVATE src/events/position_state_changed.c)
 target_sources(app PRIVATE src/behaviors/behavior_hid.c)
 target_sources(app PRIVATE src/behaviors/behavior_key_press.c)
 target_sources(app PRIVATE src/behaviors/behavior_reset.c)

app/Kconfig

@@ -73,6 +73,9 @@ config ZMK_ACTION_MOD_TAP
 	
 endmenu
 
+config HEAP_MEM_POOL_SIZE
+	default 200
+
 module = ZMK
 module-str = zmk
 source "subsys/logging/Kconfig.template.log_config"

app/dts/behaviors.dtsi

@@ -3,5 +3,4 @@
 #include <behaviors/mod_tap.dtsi>
 #include <behaviors/momentary_layer.dtsi>
 #include <behaviors/reset.dtsi>
-#include <behaviors/keymap.dtsi>
 #include <behaviors/hid.dtsi>

app/dts/behaviors/keymap.dtsi

@@ -1,9 +0,0 @@
-/ {
-	behaviors {
-		keymap_behavior: behavior_keymap {
-			compatible = "zmk,behavior-keymap", "zmk,behavior-global";
-			label = "KEYMAP";
-			#binding-cells = <0>;
-		};
-	};
-};

app/dts/bindings/behaviors/zmk,behavior-keymap.yaml

@@ -1,8 +0,0 @@
-# Copyright (c) 2020, Pete Johanson
-# SPDX-License-Identifier: MIT
-
-description: Keymap Behavior
-
-compatible: "zmk,behavior-keymap"
-
-include: zero_param.yaml

app/include/linker/zmk-events.ld

@@ -0,0 +1,16 @@
+#include <linker/linker-defs.h>
+
+	SECTION_PROLOGUE(event_types,,)
+	{
+        	__event_type_start = .; \
+        	KEEP(*(".event_type")); \
+        	__event_type_end = .; \
+	} GROUP_LINK_IN(ROMABLE_REGION)
+
+        SECTION_PROLOGUE(event_subscriptions,,)
+	{
+        	__event_subscriptions_start = .; \
+        	KEEP(*(".event_subscription")); \
+        	__event_subscriptions_end = .; \
+	} GROUP_LINK_IN(ROMABLE_REGION)
+

app/include/linker/zmk-linker-defs.h

@@ -0,0 +1,6 @@
+
+
+#define→EVENT_TYPE_SECTIONS()→  →       →       →       \
+→       →       __event_type_start = .;→      →       \
+→       →       KEEP(*(".event_type_*"));→    →       \
+→       →       __event_type_end = .;→→       →       \

app/include/zmk/event-manager.h

@@ -0,0 +1,65 @@
+#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;
+};
+
+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); \
+    const 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; \
+    }; \
+    const struct event_type* cast_##event_type(const struct zmk_event_header *eh) {\
+        return (const 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);
+
+int zmk_event_manager_raise(struct zmk_event_header *event);

app/include/zmk/events/keycode-state-changed.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <zephyr.h>
+#include <zmk/event-manager.h>
+
+struct keycode_state_changed {
+    struct zmk_event_header header;
+    u8_t usage_page;
+    u32_t keycode;
+    bool state;
+};
+
+ZMK_EVENT_DECLARE(keycode_state_changed);

app/include/zmk/events/position-state-changed.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include <zephyr.h>
+#include <zmk/event-manager.h>
+
+struct position_state_changed {
+    struct zmk_event_header header;
+    u32_t position;
+    bool state;
+};
+
+ZMK_EVENT_DECLARE(position_state_changed);

app/src/behaviors/behavior_hid.c

@@ -13,18 +13,16 @@
 
 LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 
+#include <zmk/event-manager.h>
+#include <zmk/events/keycode-state-changed.h>
 #include <zmk/hid.h>
 #include <zmk/endpoints.h>
 
 struct behavior_hid_config { };
 struct behavior_hid_data { };
 
-static int behavior_hid_init(struct device *dev)
-{
-	return 0;
-};
 
-static int on_keycode_pressed(struct device *dev, u8_t usage_page, u32_t keycode)
+static int behaviour_hid_keycode_pressed(u8_t usage_page, u32_t keycode)
 {
   int err;
   LOG_DBG("keycode %d", keycode);
@@ -49,7 +47,7 @@ static int on_keycode_pressed(struct device *dev, u8_t usage_page, u32_t keycode
   return zmk_endpoints_send_report(usage_page);
 }
 
-static int on_keycode_released(struct device *dev, u8_t usage_page, u32_t keycode)
+static int behaviour_hid_keycode_released(u8_t usage_page, u32_t keycode)
 {
   int err;
   LOG_DBG("keycode %d", keycode);
@@ -73,6 +71,28 @@ static int on_keycode_released(struct device *dev, u8_t usage_page, u32_t keycod
   return zmk_endpoints_send_report(usage_page);
 }
 
+
+int behavior_hid_listener(const struct zmk_event_header *eh)
+{
+  if (is_keycode_state_changed(eh)) {
+    const struct keycode_state_changed *ev = cast_keycode_state_changed(eh);
+    if (ev->state) {
+      behaviour_hid_keycode_pressed(ev->usage_page, ev->keycode);
+    } else {
+      behaviour_hid_keycode_released(ev->usage_page, ev->keycode);
+    }
+  }
+  return 0;
+}
+
+ZMK_LISTENER(behavior_hid, behavior_hid_listener);
+ZMK_SUBSCRIPTION(behavior_hid, keycode_state_changed);
+
+static int behavior_hid_init(struct device *dev)
+{
+	return 0;
+};
+
 static int on_modifiers_pressed(struct device *dev, zmk_mod_flags modifiers)
 {
   LOG_DBG("modifiers %d", modifiers);
@@ -90,13 +110,10 @@ static int on_modifiers_released(struct device *dev, zmk_mod_flags modifiers)
 }
 
 static const struct behavior_driver_api behavior_hid_driver_api = {
-  .keycode_pressed = on_keycode_pressed,
-  .keycode_released = on_keycode_released,
   .modifiers_pressed = on_modifiers_pressed,
   .modifiers_released = on_modifiers_released
 };
 
-
 static const struct behavior_hid_config behavior_hid_config = {};
 
 static struct behavior_hid_data behavior_hid_data;

app/src/behaviors/behavior_key_press.c

@@ -10,7 +10,8 @@
 #include <drivers/behavior.h>
 #include <logging/log.h>
 
-#include <zmk/events.h>
+#include <zmk/event-manager.h>
+#include <zmk/events/keycode-state-changed.h>
 
 LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 
@@ -27,15 +28,27 @@ static int behavior_key_press_init(struct device *dev)
 static int on_keymap_binding_pressed(struct device *dev, u32_t position, u32_t keycode, u32_t _)
 {
   const struct behavior_key_press_config *cfg = dev->config_info;
+  struct keycode_state_changed *ev;
   LOG_DBG("position %d usage_page 0x%02X keycode 0x%02X", position, cfg->usage_page, keycode);
-  return zmk_events_keycode_pressed(cfg->usage_page, keycode);
+
+  ev = new_keycode_state_changed();
+  ev->usage_page = cfg->usage_page;
+  ev->keycode = keycode;
+  ev->state = true;
+  return ZMK_EVENT_RAISE(ev);
 }
 
 static int on_keymap_binding_released(struct device *dev, u32_t position, u32_t keycode, u32_t _)
 {
   const struct behavior_key_press_config *cfg = dev->config_info;
+  struct keycode_state_changed *ev;
   LOG_DBG("position %d usage_page 0x%02X keycode 0x%02X", position, cfg->usage_page, keycode);
-  return zmk_events_keycode_released(cfg->usage_page, keycode);
+
+  ev = new_keycode_state_changed();
+  ev->usage_page = cfg->usage_page;
+  ev->keycode = keycode;
+  ev->state = false;
+  return ZMK_EVENT_RAISE(ev);
 }
 
 static const struct behavior_driver_api behavior_key_press_driver_api = {

app/src/behaviors/behavior_keymap.c

@@ -1,50 +0,0 @@
-/*
- * Copyright (c) 2020 Peter Johanson <peter@peterjohanson.com>
- *
- * SPDX-License-Identifier: MIT
- */
-
-#define DT_DRV_COMPAT zmk_behavior_keymap
-
-#include <device.h>
-#include <power/reboot.h>
-#include <drivers/behavior.h>
-#include <logging/log.h>
-
-LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
-
-#include <zmk/keymap.h>
-
-struct behavior_keymap_config { };
-struct behavior_keymap_data { };
-
-static int behavior_keymap_init(struct device *dev)
-{
-	return 0;
-};
-
-static int on_position_pressed(struct device *dev, u32_t position)
-{
-  return zmk_keymap_position_state_changed(position, true);
-}
-
-static int on_position_released(struct device *dev, u32_t position)
-{
-  return zmk_keymap_position_state_changed(position, false);
-}
-
-static const struct behavior_driver_api behavior_keymap_driver_api = {
-  .position_pressed = on_position_pressed,
-  .position_released = on_position_released,
-};
-
-
-static const struct behavior_keymap_config behavior_keymap_config = {};
-
-static struct behavior_keymap_data behavior_keymap_data;
-
-DEVICE_AND_API_INIT(behavior_keymap, DT_INST_LABEL(0), behavior_keymap_init,
-                    &behavior_keymap_data,
-                    &behavior_keymap_config,
-                    APPLICATION, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
-                    &behavior_keymap_driver_api);

app/src/behaviors/behavior_mod_tap.c

@@ -10,6 +10,8 @@
 #include <drivers/behavior.h>
 #include <logging/log.h>
 
+#include <zmk/event-manager.h>
+#include <zmk/events/keycode-state-changed.h>
 #include <zmk/events.h>
 
 LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
@@ -19,6 +21,22 @@ struct behavior_mod_tap_data {
   u16_t pending_press_positions;
 };
 
+int behavior_mod_tap_listener(const struct zmk_event_header *eh)
+{
+  if (is_keycode_state_changed(eh)) {
+    struct device *dev = device_get_binding(DT_INST_LABEL(0));
+    const struct keycode_state_changed *ev = cast_keycode_state_changed(eh);
+    if (ev->state) {
+      struct behavior_mod_tap_data *data = dev->driver_data;
+      data->pending_press_positions = 0;
+    }
+  }
+  return 0;
+}
+
+ZMK_LISTENER(behavior_mod_tap, behavior_mod_tap_listener);
+ZMK_SUBSCRIPTION(behavior_mod_tap, keycode_state_changed);
+
 static int behavior_mod_tap_init(struct device *dev)
 {
 	return 0;
@@ -50,30 +68,9 @@ zmk_events_modifiers_released(mods);
   return 0;
 }
 
-static int on_keycode_pressed(struct device *dev, u8_t usage_page, u32_t keycode)
-{
-  struct behavior_mod_tap_data *data = dev->driver_data;
-  data->pending_press_positions = 0;
-  LOG_DBG("pressing: %d", keycode);
-  return 0;
-}
-
-static int on_keycode_released(struct device *dev, u8_t usage_page, u32_t keycode)
-{
-  LOG_DBG("releasing: %d", keycode);
-  return 0;
-}
-
 static const struct behavior_driver_api behavior_mod_tap_driver_api = {
-  // These callbacks are all optional, and define which kinds of events the behavior can handle.
-  // They can reference local functions defined here, or shared event handlers.
   .binding_pressed = on_keymap_binding_pressed,
   .binding_released = on_keymap_binding_released,
-  .keycode_pressed = on_keycode_pressed,
-  .keycode_released = on_keycode_released
-  // Other optional callbacks a behavior can implement
-  // .on_mouse_moved
-  // .on_sensor_data - Any behaviour that wants to be linked to a censor can implement this behavior
 };
 
 
@@ -81,7 +78,7 @@ static const struct behavior_mod_tap_config behavior_mod_tap_config = {};
 
 static struct behavior_mod_tap_data behavior_mod_tap_data;
 
-DEVICE_AND_API_INIT(behavior_key_press, DT_INST_LABEL(0), behavior_mod_tap_init,
+DEVICE_AND_API_INIT(behavior_mod_tap, DT_INST_LABEL(0), behavior_mod_tap_init,
                     &behavior_mod_tap_data,
                     &behavior_mod_tap_config,
                     APPLICATION, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,

app/src/event_manager.c

@@ -0,0 +1,32 @@
+
+#include <zephyr.h>
+#include <logging/log.h>
+
+LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
+
+#include <zmk/event-manager.h>
+
+extern struct zmk_event_type* __event_type_start[];
+extern struct zmk_event_type* __event_type_end[];
+
+extern struct zmk_event_subscription __event_subscriptions_start[];
+extern struct zmk_event_subscription __event_subscriptions_end[];
+
+int zmk_event_manager_raise(struct zmk_event_header *event)
+{
+    int ret;
+    struct zmk_event_subscription *ev_sub;
+    for (ev_sub = __event_subscriptions_start; ev_sub != __event_subscriptions_end; ev_sub++) {
+        if (ev_sub->event_type == event->event) {
+            ret = ev_sub->listener->callback(event);
+            if (ret) {
+                LOG_DBG("Listener returned an error: %d", ret);
+                goto release;
+            }
+        }
+    }
+
+release:
+    k_free(event);
+    return ret;
+}

app/src/events/keycode_state_changed.c

@@ -0,0 +1,6 @@
+
+
+#include <kernel.h>
+#include <zmk/events/keycode-state-changed.h>
+
+ZMK_EVENT_IMPL(keycode_state_changed);

app/src/events/position_state_changed.c

@@ -0,0 +1,6 @@
+
+
+#include <kernel.h>
+#include <zmk/events/position-state-changed.h>
+
+ZMK_EVENT_IMPL(position_state_changed);

app/src/keymap.c

@@ -9,6 +9,9 @@ LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 #include <drivers/behavior.h>
 #include <zmk/behavior.h>
 
+#include <zmk/event-manager.h>
+#include <zmk/events/position-state-changed.h>
+
 static u32_t zmk_keymap_layer_state = 0;
 static u8_t zmk_keymap_layer_default = 0;
 
@@ -116,3 +119,16 @@ int zmk_keymap_position_state_changed(u32_t position, bool pressed)
 
 	return -ENOTSUP;
 }
+
+int keymap_listener(const struct zmk_event_header *eh)
+{
+  	if (is_position_state_changed(eh)) {
+    	const struct position_state_changed *ev = cast_position_state_changed(eh);
+		zmk_keymap_position_state_changed(ev->position, ev->state);
+  	}
+  	return 0;
+}
+
+ZMK_LISTENER(keymap, keymap_listener);
+ZMK_SUBSCRIPTION(keymap, position_state_changed);
+

app/src/kscan.c

@@ -12,7 +12,8 @@
 LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 
 #include <zmk/matrix_transform.h>
-#include <zmk/events.h>
+#include <zmk/event-manager.h>
+#include <zmk/events/position-state-changed.h>
 
 #define ZMK_KSCAN_EVENT_STATE_PRESSED 0
 #define ZMK_KSCAN_EVENT_STATE_RELEASED 1
@@ -50,12 +51,12 @@ void zmk_kscan_process_msgq(struct k_work *item)
 	{
 		bool pressed = (ev.state == ZMK_KSCAN_EVENT_STATE_PRESSED);
 		u32_t position = zmk_matrix_transform_row_column_to_position(ev.row, ev.column);
+		struct position_state_changed *pos_ev;
 		LOG_DBG("Row: %d, col: %d, position: %d, pressed: %s\n", ev.row, ev.column, position, (pressed ? "true" : "false"));
-		if (pressed) {
-			zmk_events_position_pressed(position);
-		} else {
-			zmk_events_position_released(position);
-		}
+		pos_ev = new_position_state_changed();
+		pos_ev->state = pressed;
+		pos_ev->position = position;
+		ZMK_EVENT_RAISE(pos_ev);
 	}
 }