Add timestamps to position and behavior events (#147)

* Add timestamps to position events and behaviors.

- Take original event timestamps into consideration so nested tap-holds have proper timing.
- Add position and timestamp to keycode state changed event so the one-shot behavior can properly identify other keypresses and timings.
- Add timestamp to position events received from peripheral

* reduce number of arguments to behaviors

app/include/drivers/behavior.h

@@ -10,6 +10,7 @@
 #include <stddef.h>
 #include <device.h>
 #include <zmk/keys.h>
+#include <zmk/behavior.h>
 
 /**
  * @cond INTERNAL_HIDDEN
@@ -19,10 +20,10 @@
  * (Internal use only.)
  */
 
-typedef int (*behavior_keymap_binding_callback_t)(struct device *dev, u32_t position, u32_t param1,
+typedef int (*behavior_keymap_binding_callback_t)(struct zmk_behavior_binding *binding,
-                                                  u32_t param2);
+                                                  struct zmk_behavior_binding_event event);
-typedef int (*behavior_sensor_keymap_binding_callback_t)(struct device *dev, struct device *sensor,
+typedef int (*behavior_sensor_keymap_binding_callback_t)(struct zmk_behavior_binding *binding,
-                                                         u32_t param1, u32_t param2);
+                                                         struct device *sensor);
 
 __subsystem struct behavior_driver_api {
     behavior_keymap_binding_callback_t binding_pressed;
@@ -42,18 +43,19 @@ __subsystem struct behavior_driver_api {
  * @retval 0 If successful.
  * @retval Negative errno code if failure.
  */
-__syscall int behavior_keymap_binding_pressed(struct device *dev, u32_t position, u32_t param1,
+__syscall int behavior_keymap_binding_pressed(struct zmk_behavior_binding *binding,
-                                              u32_t param2);
+                                              struct zmk_behavior_binding_event event);
 
-static inline int z_impl_behavior_keymap_binding_pressed(struct device *dev, u32_t position,
+static inline int z_impl_behavior_keymap_binding_pressed(struct zmk_behavior_binding *binding,
-                                                         u32_t param1, u32_t param2) {
+                                                         struct zmk_behavior_binding_event event) {
+    struct device *dev = device_get_binding(binding->behavior_dev);
     const struct behavior_driver_api *api = (const struct behavior_driver_api *)dev->driver_api;
 
     if (api->binding_pressed == NULL) {
         return -ENOTSUP;
     }
 
-    return api->binding_pressed(dev, position, param1, param2);
+    return api->binding_pressed(binding, event);
 }
 
 /**
@@ -64,18 +66,19 @@ static inline int z_impl_behavior_keymap_binding_pressed(struct device *dev, u32
  * @retval 0 If successful.
  * @retval Negative errno code if failure.
  */
-__syscall int behavior_keymap_binding_released(struct device *dev, u32_t position, u32_t param1,
+__syscall int behavior_keymap_binding_released(struct zmk_behavior_binding *binding,
-                                               u32_t param2);
+                                               struct zmk_behavior_binding_event event);
 
-static inline int z_impl_behavior_keymap_binding_released(struct device *dev, u32_t position,
+static inline int z_impl_behavior_keymap_binding_released(struct zmk_behavior_binding *binding,
-                                                          u32_t param1, u32_t param2) {
+                                                          struct zmk_behavior_binding_event event) {
+    struct device *dev = device_get_binding(binding->behavior_dev);
     const struct behavior_driver_api *api = (const struct behavior_driver_api *)dev->driver_api;
 
     if (api->binding_released == NULL) {
         return -ENOTSUP;
     }
 
-    return api->binding_released(dev, position, param1, param2);
+    return api->binding_released(binding, event);
 }
 
 /**
@@ -88,19 +91,20 @@ static inline int z_impl_behavior_keymap_binding_released(struct device *dev, u3
  * @retval 0 If successful.
  * @retval Negative errno code if failure.
  */
-__syscall int behavior_sensor_keymap_binding_triggered(struct device *dev, struct device *sensor,
+__syscall int behavior_sensor_keymap_binding_triggered(struct zmk_behavior_binding *binding,
-                                                       u32_t param1, u32_t param2);
+                                                       struct device *sensor);
 
-static inline int z_impl_behavior_sensor_keymap_binding_triggered(struct device *dev,
+static inline int
-                                                                  struct device *sensor,
+z_impl_behavior_sensor_keymap_binding_triggered(struct zmk_behavior_binding *binding,
-                                                                  u32_t param1, u32_t param2) {
+                                                struct device *sensor) {
+    struct device *dev = device_get_binding(binding->behavior_dev);
     const struct behavior_driver_api *api = (const struct behavior_driver_api *)dev->driver_api;
 
     if (api->sensor_binding_triggered == NULL) {
         return -ENOTSUP;
     }
 
-    return api->sensor_binding_triggered(dev, sensor, param1, param2);
+    return api->sensor_binding_triggered(binding, sensor);
 }
 
 /**

app/include/zmk/behavior.h

@@ -10,4 +10,10 @@ struct zmk_behavior_binding {
     char *behavior_dev;
     u32_t param1;
     u32_t param2;
+};
+
+struct zmk_behavior_binding_event {
+    int layer;
+    u32_t position;
+    s64_t timestamp;
 };

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

@@ -24,6 +24,5 @@ inline struct keycode_state_changed *create_keycode_state_changed(u8_t usage_pag
     ev->usage_page = usage_page;
     ev->keycode = keycode;
     ev->state = state;
-
     return ev;
 }

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

@@ -13,6 +13,7 @@ struct position_state_changed {
     struct zmk_event_header header;
     u32_t position;
     bool state;
+    s64_t timestamp;
 };
 
 ZMK_EVENT_DECLARE(position_state_changed);

app/include/zmk/keymap.h

@@ -11,4 +11,4 @@ int zmk_keymap_layer_activate(u8_t layer);
 int zmk_keymap_layer_deactivate(u8_t layer);
 int zmk_keymap_layer_toggle(u8_t layer);
 
-int zmk_keymap_position_state_changed(u32_t position, bool pressed);
+int zmk_keymap_position_state_changed(u32_t position, bool pressed, s64_t timestamp);

app/src/behaviors/behavior_bt.c

@@ -8,18 +8,18 @@
 
 #include <device.h>
 #include <drivers/behavior.h>
-
 #include <dt-bindings/zmk/bt.h>
-
 #include <bluetooth/conn.h>
-
 #include <logging/log.h>
+#include <zmk/behavior.h>
+
 LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 
 #include <zmk/ble.h>
 
-static int on_keymap_binding_pressed(struct device *dev, u32_t position, u32_t command, u32_t arg) {
+static int on_keymap_binding_pressed(struct zmk_behavior_binding *binding,
-    switch (command) {
+                                     struct zmk_behavior_binding_event event) {
+    switch (binding->param1) {
     case BT_CLR_CMD:
         return zmk_ble_clear_bonds();
     case BT_NXT_CMD:
@@ -27,9 +27,9 @@ static int on_keymap_binding_pressed(struct device *dev, u32_t position, u32_t c
     case BT_PRV_CMD:
         return zmk_ble_prof_prev();
     case BT_SEL_CMD:
-        return zmk_ble_prof_select(arg);
+        return zmk_ble_prof_select(binding->param2);
     default:
-        LOG_ERR("Unknown BT command: %d", command);
+        LOG_ERR("Unknown BT command: %d", binding->param1);
     }
 
     return -ENOTSUP;
@@ -37,8 +37,8 @@ static int on_keymap_binding_pressed(struct device *dev, u32_t position, u32_t c
 
 static int behavior_bt_init(struct device *dev) { return 0; };
 
-static int on_keymap_binding_released(struct device *dev, u32_t position, u32_t command,
+static int on_keymap_binding_released(struct zmk_behavior_binding *binding,
-                                      u32_t arg) {
+                                      struct zmk_behavior_binding_event event) {
     return 0;
 }
 

app/src/behaviors/behavior_hold_tap.c

@@ -10,7 +10,6 @@
 #include <drivers/behavior.h>
 #include <logging/log.h>
 #include <zmk/behavior.h>
-
 #include <zmk/matrix.h>
 #include <zmk/endpoints.h>
 #include <zmk/event-manager.h>
@@ -18,6 +17,7 @@
 #include <zmk/events/keycode-state-changed.h>
 #include <zmk/events/modifiers-state-changed.h>
 #include <zmk/hid.h>
+#include <zmk/behavior.h>
 
 LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 
@@ -40,10 +40,8 @@ struct behavior_hold_tap_behaviors {
     struct zmk_behavior_binding hold;
 };
 
-typedef k_timeout_t (*timer_func)();
-
 struct behavior_hold_tap_config {
-    timer_func tapping_term_ms;
+    int tapping_term_ms;
     struct behavior_hold_tap_behaviors *behaviors;
     enum flavor flavor;
 };
@@ -51,8 +49,10 @@ struct behavior_hold_tap_config {
 // this data is specific for each hold-tap
 struct active_hold_tap {
     s32_t position;
+    // todo: move these params into the config->behaviors->tap and
     u32_t param_hold;
     u32_t param_tap;
+    s64_t timestamp;
     bool is_decided;
     bool is_hold;
     const struct behavior_hold_tap_config *config;
@@ -164,6 +164,7 @@ static struct active_hold_tap *find_hold_tap(u32_t position) {
 }
 
 static struct active_hold_tap *store_hold_tap(u32_t position, u32_t param_hold, u32_t param_tap,
+                                              s64_t timestamp,
                                               const struct behavior_hold_tap_config *config) {
     for (int i = 0; i < ZMK_BHV_HOLD_TAP_MAX_HELD; i++) {
         if (active_hold_taps[i].position != ZMK_BHV_HOLD_TAP_POSITION_NOT_USED) {
@@ -175,6 +176,7 @@ static struct active_hold_tap *store_hold_tap(u32_t position, u32_t param_hold,
         active_hold_taps[i].config = config;
         active_hold_taps[i].param_hold = param_hold;
         active_hold_taps[i].param_tap = param_tap;
+        active_hold_taps[i].timestamp = timestamp;
         return &active_hold_taps[i];
     }
     return NULL;
@@ -253,7 +255,7 @@ static inline char *flavor_str(enum flavor flavor) {
     return "UNKNOWN FLAVOR";
 }
 
-static void decide_hold_tap(struct active_hold_tap *hold_tap, enum decision_moment event) {
+static void decide_hold_tap(struct active_hold_tap *hold_tap, enum decision_moment event_type) {
     if (hold_tap->is_decided) {
         return;
     }
@@ -265,11 +267,11 @@ static void decide_hold_tap(struct active_hold_tap *hold_tap, enum decision_mome
 
     switch (hold_tap->config->flavor) {
     case ZMK_BHV_HOLD_TAP_FLAVOR_HOLD_PREFERRED:
-        decide_hold_preferred(hold_tap, event);
+        decide_hold_preferred(hold_tap, event_type);
     case ZMK_BHV_HOLD_TAP_FLAVOR_BALANCED:
-        decide_balanced(hold_tap, event);
+        decide_balanced(hold_tap, event_type);
     case ZMK_BHV_HOLD_TAP_FLAVOR_TAP_PREFERRED:
-        decide_tap_preferred(hold_tap, event);
+        decide_tap_preferred(hold_tap, event_type);
     }
 
     if (!hold_tap->is_decided) {
@@ -277,26 +279,31 @@ static void decide_hold_tap(struct active_hold_tap *hold_tap, enum decision_mome
     }
 
     LOG_DBG("%d decided %s (%s event %d)", hold_tap->position, hold_tap->is_hold ? "hold" : "tap",
-            flavor_str(hold_tap->config->flavor), event);
+            flavor_str(hold_tap->config->flavor), event_type);
     undecided_hold_tap = NULL;
 
-    struct zmk_behavior_binding *behavior;
+    struct zmk_behavior_binding_event event = {
+        .position = hold_tap->position,
+        .timestamp = hold_tap->timestamp,
+    };
+
+    struct zmk_behavior_binding binding;
     if (hold_tap->is_hold) {
-        behavior = &hold_tap->config->behaviors->hold;
+        binding.behavior_dev = hold_tap->config->behaviors->hold.behavior_dev;
-        struct device *behavior_device = device_get_binding(behavior->behavior_dev);
+        binding.param1 = hold_tap->param_hold;
-        behavior_keymap_binding_pressed(behavior_device, hold_tap->position, hold_tap->param_hold,
+        binding.param2 = 0;
-                                        0);
     } else {
-        behavior = &hold_tap->config->behaviors->tap;
+        binding.behavior_dev = hold_tap->config->behaviors->tap.behavior_dev;
-        struct device *behavior_device = device_get_binding(behavior->behavior_dev);
+        binding.param1 = hold_tap->param_tap;
-        behavior_keymap_binding_pressed(behavior_device, hold_tap->position, hold_tap->param_tap,
+        binding.param2 = 0;
-                                        0);
     }
+    behavior_keymap_binding_pressed(&binding, event);
     release_captured_events();
 }
 
-static int on_hold_tap_binding_pressed(struct device *dev, u32_t position, u32_t param_hold,
+static int on_hold_tap_binding_pressed(struct zmk_behavior_binding *binding,
-                                       u32_t param_tap) {
+                                       struct zmk_behavior_binding_event event) {
+    struct device *dev = device_get_binding(binding->behavior_dev);
     const struct behavior_hold_tap_config *cfg = dev->config_info;
 
     if (undecided_hold_tap != NULL) {
@@ -305,54 +312,69 @@ static int on_hold_tap_binding_pressed(struct device *dev, u32_t position, u32_t
         return 0;
     }
 
-    struct active_hold_tap *hold_tap = store_hold_tap(position, param_hold, param_tap, cfg);
+    struct active_hold_tap *hold_tap =
+        store_hold_tap(event.position, binding->param1, binding->param2, event.timestamp, cfg);
     if (hold_tap == NULL) {
         LOG_ERR("unable to store hold-tap info, did you press more than %d hold-taps?",
                 ZMK_BHV_HOLD_TAP_MAX_HELD);
         return 0;
     }
 
-    LOG_DBG("%d new undecided hold_tap", position);
+    LOG_DBG("%d new undecided hold_tap", event.position);
     undecided_hold_tap = hold_tap;
-    k_delayed_work_submit(&hold_tap->work, cfg->tapping_term_ms());
 
-    // todo: once we get timing info for keypresses, start the timer relative to the original
+    // if this behavior was queued we have to adjust the timer to only
-    // keypress don't forget to simulate a timer-event before the event after that time was handled.
+    // wait for the remaining time.
+    s32_t tapping_term_ms_left = (hold_tap->timestamp + cfg->tapping_term_ms) - k_uptime_get();
+    if (tapping_term_ms_left > 0) {
+        k_delayed_work_submit(&hold_tap->work, K_MSEC(tapping_term_ms_left));
+    }
 
     return 0;
 }
 
-static int on_hold_tap_binding_released(struct device *dev, u32_t position, u32_t _, u32_t __) {
+static int on_hold_tap_binding_released(struct zmk_behavior_binding *binding,
-    struct active_hold_tap *hold_tap = find_hold_tap(position);
+                                        struct zmk_behavior_binding_event event) {
-
+    struct active_hold_tap *hold_tap = find_hold_tap(event.position);
     if (hold_tap == NULL) {
         LOG_ERR("ACTIVE_HOLD_TAP_CLEANED_UP_TOO_EARLY");
         return 0;
     }
 
+    // If these events were queued, the timer event may be queued too late or not at all.
+    // We insert a timer event before the TH_KEY_UP event to verify.
     int work_cancel_result = k_delayed_work_cancel(&hold_tap->work);
+    if (event.timestamp > (hold_tap->timestamp + hold_tap->config->tapping_term_ms)) {
+        decide_hold_tap(hold_tap, HT_TIMER_EVENT);
+    }
+
     decide_hold_tap(hold_tap, HT_KEY_UP);
 
-    struct zmk_behavior_binding *behavior;
+    // todo: set up the binding and data items inside of the active_hold_tap struct
+    struct zmk_behavior_binding_event sub_behavior_data = {
+        .position = hold_tap->position,
+        .timestamp = hold_tap->timestamp,
+    };
+
+    struct zmk_behavior_binding sub_behavior_binding;
     if (hold_tap->is_hold) {
-        behavior = &hold_tap->config->behaviors->hold;
+        sub_behavior_binding.behavior_dev = hold_tap->config->behaviors->hold.behavior_dev;
-        struct device *behavior_device = device_get_binding(behavior->behavior_dev);
+        sub_behavior_binding.param1 = hold_tap->param_hold;
-        behavior_keymap_binding_released(behavior_device, hold_tap->position, hold_tap->param_hold,
+        sub_behavior_binding.param2 = 0;
-                                         0);
     } else {
-        behavior = &hold_tap->config->behaviors->tap;
+        sub_behavior_binding.behavior_dev = hold_tap->config->behaviors->tap.behavior_dev;
-        struct device *behavior_device = device_get_binding(behavior->behavior_dev);
+        sub_behavior_binding.param1 = hold_tap->param_tap;
-        behavior_keymap_binding_released(behavior_device, hold_tap->position, hold_tap->param_tap,
+        sub_behavior_binding.param2 = 0;
-                                         0);
     }
+    behavior_keymap_binding_released(&sub_behavior_binding, sub_behavior_data);
 
     if (work_cancel_result == -EINPROGRESS) {
         // let the timer handler clean up
         // if we'd clear now, the timer may call back for an uninitialized active_hold_tap.
-        LOG_DBG("%d hold-tap timer work in event queue", position);
+        LOG_DBG("%d hold-tap timer work in event queue", event.position);
         hold_tap->work_is_cancelled = true;
     } else {
-        LOG_DBG("%d cleaning up hold-tap", position);
+        LOG_DBG("%d cleaning up hold-tap", event.position);
         clear_hold_tap(hold_tap);
     }
 
@@ -382,6 +404,14 @@ static int position_state_changed_listener(const struct zmk_event_header *eh) {
         }
     }
 
+    // If these events were queued, the timer event may be queued too late or not at all.
+    // We make a timer decision before the other key events are handled if the timer would
+    // have run out.
+    if (ev->timestamp >
+        (undecided_hold_tap->timestamp + undecided_hold_tap->config->tapping_term_ms)) {
+        decide_hold_tap(undecided_hold_tap, HT_TIMER_EVENT);
+    }
+
     if (!ev->state && find_captured_keydown_event(ev->position) == NULL) {
         // no keydown event has been captured, let it bubble.
         // we'll catch modifiers later in modifier_state_changed_listener
@@ -463,6 +493,7 @@ static int behavior_hold_tap_init(struct device *dev) {
 struct behavior_hold_tap_data {};
 static struct behavior_hold_tap_data behavior_hold_tap_data;
 
+/* todo: get rid of unused param1 and param2. */
 #define _TRANSFORM_ENTRY(idx, node)                                                                \
     {                                                                                              \
         .behavior_dev = DT_LABEL(DT_INST_PHANDLE_BY_IDX(node, bindings, idx)),                     \
@@ -473,14 +504,11 @@ static struct behavior_hold_tap_data behavior_hold_tap_data;
     },
 
 #define KP_INST(n)                                                                                 \
-    static k_timeout_t behavior_hold_tap_config_##n##_gettime() {                                  \
-        return K_MSEC(DT_INST_PROP(n, tapping_term_ms));                                           \
-    }                                                                                              \
     static struct behavior_hold_tap_behaviors behavior_hold_tap_behaviors_##n = {                  \
         .hold = _TRANSFORM_ENTRY(0, n).tap = _TRANSFORM_ENTRY(1, n)};                              \
     static struct behavior_hold_tap_config behavior_hold_tap_config_##n = {                        \
         .behaviors = &behavior_hold_tap_behaviors_##n,                                             \
-        .tapping_term_ms = &behavior_hold_tap_config_##n##_gettime,                                \
+        .tapping_term_ms = DT_INST_PROP(n, tapping_term_ms),                                       \
         .flavor = DT_ENUM_IDX(DT_DRV_INST(n), flavor),                                             \
     };                                                                                             \
     DEVICE_AND_API_INIT(behavior_hold_tap_##n, DT_INST_LABEL(n), behavior_hold_tap_init,           \

app/src/behaviors/behavior_key_press.c

@@ -12,6 +12,7 @@
 
 #include <zmk/event-manager.h>
 #include <zmk/events/keycode-state-changed.h>
+#include <zmk/behavior.h>
 
 LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 
@@ -22,18 +23,24 @@ struct behavior_key_press_data {};
 
 static int behavior_key_press_init(struct device *dev) { return 0; };
 
-static int on_keymap_binding_pressed(struct device *dev, u32_t position, u32_t keycode, u32_t _) {
+static int on_keymap_binding_pressed(struct zmk_behavior_binding *binding,
+                                     struct zmk_behavior_binding_event event) {
+    struct device *dev = device_get_binding(binding->behavior_dev);
     const struct behavior_key_press_config *cfg = dev->config_info;
-    LOG_DBG("position %d usage_page 0x%02X keycode 0x%02X", position, cfg->usage_page, keycode);
+    LOG_DBG("position %d usage_page 0x%02X keycode 0x%02X", event.position, cfg->usage_page,
+            binding->param1);
 
-    return ZMK_EVENT_RAISE(create_keycode_state_changed(cfg->usage_page, keycode, true));
+    return ZMK_EVENT_RAISE(create_keycode_state_changed(cfg->usage_page, binding->param1, true));
 }
 
-static int on_keymap_binding_released(struct device *dev, u32_t position, u32_t keycode, u32_t _) {
+static int on_keymap_binding_released(struct zmk_behavior_binding *binding,
+                                      struct zmk_behavior_binding_event event) {
+    struct device *dev = device_get_binding(binding->behavior_dev);
     const struct behavior_key_press_config *cfg = dev->config_info;
-    LOG_DBG("position %d usage_page 0x%02X keycode 0x%02X", position, cfg->usage_page, keycode);
+    LOG_DBG("position %d usage_page 0x%02X keycode 0x%02X", event.position, cfg->usage_page,
+            binding->param1);
 
-    return ZMK_EVENT_RAISE(create_keycode_state_changed(cfg->usage_page, keycode, false));
+    return ZMK_EVENT_RAISE(create_keycode_state_changed(cfg->usage_page, binding->param1, false));
 }
 
 static const struct behavior_driver_api behavior_key_press_driver_api = {

app/src/behaviors/behavior_momentary_layer.c

@@ -11,6 +11,7 @@
 #include <logging/log.h>
 
 #include <zmk/keymap.h>
+#include <zmk/behavior.h>
 
 LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 
@@ -19,16 +20,16 @@ struct behavior_mo_data {};
 
 static int behavior_mo_init(struct device *dev) { return 0; };
 
-static int mo_keymap_binding_pressed(struct device *dev, u32_t position, u32_t layer, u32_t _) {
+static int mo_keymap_binding_pressed(struct zmk_behavior_binding *binding,
-    LOG_DBG("position %d layer %d", position, layer);
+                                     struct zmk_behavior_binding_event event) {
-
+    LOG_DBG("position %d layer %d", event.position, binding->param1);
-    return zmk_keymap_layer_activate(layer);
+    return zmk_keymap_layer_activate(binding->param1);
 }
 
-static int mo_keymap_binding_released(struct device *dev, u32_t position, u32_t layer, u32_t _) {
+static int mo_keymap_binding_released(struct zmk_behavior_binding *binding,
-    LOG_DBG("position %d layer %d", position, layer);
+                                      struct zmk_behavior_binding_event event) {
-
+    LOG_DBG("position %d layer %d", event.position, binding->param1);
-    return zmk_keymap_layer_deactivate(layer);
+    return zmk_keymap_layer_deactivate(binding->param1);
 }
 
 static const struct behavior_driver_api behavior_mo_driver_api = {

app/src/behaviors/behavior_none.c

@@ -11,6 +11,8 @@
 #include <drivers/behavior.h>
 #include <logging/log.h>
 
+#include <zmk/behavior.h>
+
 LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 
 struct behavior_none_config {};
@@ -18,13 +20,13 @@ struct behavior_none_data {};
 
 static int behavior_none_init(struct device *dev) { return 0; };
 
-static int on_keymap_binding_pressed(struct device *dev, u32_t position, u32_t _param1,
+static int on_keymap_binding_pressed(struct zmk_behavior_binding *binding,
-                                     u32_t _param2) {
+                                     struct zmk_behavior_binding_event event) {
     return 0;
 }
 
-static int on_keymap_binding_released(struct device *dev, u32_t position, u32_t _param1,
+static int on_keymap_binding_released(struct zmk_behavior_binding *binding,
-                                      u32_t _param2) {
+                                      struct zmk_behavior_binding_event event) {
     return 0;
 }
 

app/src/behaviors/behavior_reset.c

@@ -11,6 +11,8 @@
 #include <drivers/behavior.h>
 #include <logging/log.h>
 
+#include <zmk/behavior.h>
+
 LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 
 struct behavior_reset_config {
@@ -19,8 +21,9 @@ struct behavior_reset_config {
 
 static int behavior_reset_init(struct device *dev) { return 0; };
 
-static int on_keymap_binding_pressed(struct device *dev, u32_t position, u32_t _param1,
+static int on_keymap_binding_pressed(struct zmk_behavior_binding *binding,
-                                     u32_t _param2) {
+                                     struct zmk_behavior_binding_event event) {
+    struct device *dev = device_get_binding(binding->behavior_dev);
     const struct behavior_reset_config *cfg = dev->config_info;
 
     // TODO: Correct magic code for going into DFU?

app/src/behaviors/behavior_rgb_underglow.c

@@ -12,13 +12,15 @@
 
 #include <dt-bindings/zmk/rgb.h>
 #include <zmk/rgb_underglow.h>
+#include <zmk/keymap.h>
 
 LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 
 static int behavior_rgb_underglow_init(struct device *dev) { return 0; }
 
-static int on_keymap_binding_pressed(struct device *dev, u32_t position, u32_t action, u32_t _) {
+static int on_keymap_binding_pressed(struct zmk_behavior_binding *binding,
-    switch (action) {
+                                     struct zmk_behavior_binding_event event) {
+    switch (binding->param1) {
     case RGB_TOG:
         return zmk_rgb_underglow_toggle();
     case RGB_HUI:

app/src/behaviors/behavior_sensor_rotate_key_press.c

@@ -23,15 +23,16 @@ struct behavior_sensor_rotate_key_press_data {};
 
 static int behavior_sensor_rotate_key_press_init(struct device *dev) { return 0; };
 
-static int on_sensor_binding_triggered(struct device *dev, struct device *sensor,
+static int on_sensor_binding_triggered(struct zmk_behavior_binding *binding,
-                                       u32_t increment_keycode, u32_t decrement_keycode) {
+                                       struct device *sensor) {
+    struct device *dev = device_get_binding(binding->behavior_dev);
     const struct behavior_sensor_rotate_key_press_config *cfg = dev->config_info;
     struct sensor_value value;
     int err;
     u32_t keycode;
     struct keycode_state_changed *ev;
     LOG_DBG("usage_page 0x%02X inc keycode 0x%02X dec keycode 0x%02X", cfg->usage_page,
-            increment_keycode, decrement_keycode);
+            binding->param1, binding->param2);
 
     err = sensor_channel_get(sensor, SENSOR_CHAN_ROTATION, &value);
 
@@ -42,10 +43,10 @@ static int on_sensor_binding_triggered(struct device *dev, struct device *sensor
 
     switch (value.val1) {
     case 1:
-        keycode = increment_keycode;
+        keycode = binding->param1;
         break;
     case -1:
-        keycode = decrement_keycode;
+        keycode = binding->param2;
         break;
     default:
         return -ENOTSUP;

app/src/behaviors/behavior_toggle_layer.c

@@ -11,6 +11,7 @@
 #include <logging/log.h>
 
 #include <zmk/keymap.h>
+#include <zmk/behavior.h>
 
 LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 
@@ -19,15 +20,15 @@ struct behavior_tog_data {};
 
 static int behavior_tog_init(struct device *dev) { return 0; };
 
-static int tog_keymap_binding_pressed(struct device *dev, u32_t position, u32_t layer, u32_t _) {
+static int tog_keymap_binding_pressed(struct zmk_behavior_binding *binding,
-    LOG_DBG("position %d layer %d", position, layer);
+                                      struct zmk_behavior_binding_event event) {
-
+    LOG_DBG("position %d layer %d", event.position, binding->param1);
-    return zmk_keymap_layer_toggle(layer);
+    return zmk_keymap_layer_toggle(binding->param1);
 }
 
-static int tog_keymap_binding_released(struct device *dev, u32_t position, u32_t layer, u32_t _) {
+static int tog_keymap_binding_released(struct zmk_behavior_binding *binding,
-    LOG_DBG("position %d layer %d", position, layer);
+                                       struct zmk_behavior_binding_event event) {
-
+    LOG_DBG("position %d layer %d", event.position, binding->param1);
     return 0;
 }
 

app/src/behaviors/behavior_transparent.c

@@ -11,6 +11,8 @@
 #include <drivers/behavior.h>
 #include <logging/log.h>
 
+#include <zmk/behavior.h>
+
 LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 
 struct behavior_transparent_config {};
@@ -18,13 +20,13 @@ struct behavior_transparent_data {};
 
 static int behavior_transparent_init(struct device *dev) { return 0; };
 
-static int on_keymap_binding_pressed(struct device *dev, u32_t position, u32_t _param1,
+static int on_keymap_binding_pressed(struct zmk_behavior_binding *binding,
-                                     u32_t _param2) {
+                                     struct zmk_behavior_binding_event event) {
     return 1;
 }
 
-static int on_keymap_binding_released(struct device *dev, u32_t position, u32_t _param1,
+static int on_keymap_binding_released(struct zmk_behavior_binding *binding,
-                                      u32_t _param2) {
+                                      struct zmk_behavior_binding_event event) {
     return 1;
 }
 

app/src/keymap.c

@@ -104,9 +104,14 @@ bool is_active_layer(u8_t layer, u32_t layer_state) {
     return (layer_state & BIT(layer)) == BIT(layer) || layer == zmk_keymap_layer_default;
 }
 
-int zmk_keymap_apply_position_state(int layer, u32_t position, bool pressed) {
+int zmk_keymap_apply_position_state(int layer, u32_t position, bool pressed, s64_t timestamp) {
     struct zmk_behavior_binding *binding = &zmk_keymap[layer][position];
     struct device *behavior;
+    struct zmk_behavior_binding_event event = {
+        .layer = layer,
+        .position = position,
+        .timestamp = timestamp,
+    };
 
     LOG_DBG("layer: %d position: %d, binding name: %s", layer, position,
             log_strdup(binding->behavior_dev));
@@ -119,20 +124,18 @@ int zmk_keymap_apply_position_state(int layer, u32_t position, bool pressed) {
     }
 
     if (pressed) {
-        return behavior_keymap_binding_pressed(behavior, position, binding->param1,
+        return behavior_keymap_binding_pressed(binding, event);
-                                               binding->param2);
     } else {
-        return behavior_keymap_binding_released(behavior, position, binding->param1,
+        return behavior_keymap_binding_released(binding, event);
-                                                binding->param2);
     }
 }
 
-int zmk_keymap_position_state_changed(u32_t position, bool pressed) {
+int zmk_keymap_position_state_changed(u32_t position, bool pressed, s64_t timestamp) {
     for (int layer = ZMK_KEYMAP_LAYERS_LEN - 1; layer >= zmk_keymap_layer_default; layer--) {
         u32_t layer_state =
             pressed ? zmk_keymap_layer_state : zmk_keymap_active_behavior_layer[position];
         if (is_active_layer(layer, layer_state)) {
-            int ret = zmk_keymap_apply_position_state(layer, position, pressed);
+            int ret = zmk_keymap_apply_position_state(layer, position, pressed, timestamp);
 
             zmk_keymap_active_behavior_layer[position] = zmk_keymap_layer_state;
 
@@ -171,8 +174,7 @@ int zmk_keymap_sensor_triggered(u8_t sensor_number, struct device *sensor) {
                 continue;
             }
 
-            ret = behavior_sensor_keymap_binding_triggered(behavior, sensor, binding->param1,
+            ret = behavior_sensor_keymap_binding_triggered(binding, sensor);
-                                                           binding->param2);
 
             if (ret > 0) {
                 LOG_DBG("behavior processing to continue to next layer");
@@ -194,7 +196,7 @@ int zmk_keymap_sensor_triggered(u8_t sensor_number, struct device *sensor) {
 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);
-        return zmk_keymap_position_state_changed(ev->position, ev->state);
+        return zmk_keymap_position_state_changed(ev->position, ev->state, ev->timestamp);
 #if ZMK_KEYMAP_HAS_SENSORS
     } else if (is_sensor_event(eh)) {
         const struct sensor_event *ev = cast_sensor_event(eh);

app/src/kscan.c

@@ -52,6 +52,7 @@ void zmk_kscan_process_msgq(struct k_work *item) {
         pos_ev = new_position_state_changed();
         pos_ev->state = pressed;
         pos_ev->position = position;
+        pos_ev->timestamp = k_uptime_get();
         ZMK_EVENT_RAISE(pos_ev);
     }
 }

app/src/split/bluetooth/central.c

@@ -60,6 +60,7 @@ static u8_t split_central_notify_func(struct bt_conn *conn, struct bt_gatt_subsc
                 struct position_state_changed *pos_ev = new_position_state_changed();
                 pos_ev->position = position;
                 pos_ev->state = pressed;
+                pos_ev->timestamp = k_uptime_get();
 
                 LOG_DBG("Trigger key position state change for %d", position);
                 ZMK_EVENT_RAISE(pos_ev);

app/tests/hold-tap/balanced/many-nested/events.patterns

@@ -0,0 +1,4 @@
+s/.*hid_listener_keycode/kp/p
+s/.*mo_keymap_binding/mo/p
+s/.*on_hold_tap_binding/ht_binding/p
+s/.*decide_hold_tap/ht_decide/p

app/tests/hold-tap/balanced/many-nested/keycode_events.snapshot

@@ -0,0 +1,20 @@
+ht_binding_pressed: 0 new undecided hold_tap
+ht_decide: 0 decided hold (balanced event 3)
+kp_pressed: usage_page 0x07 keycode 0xe1
+ht_binding_pressed: 1 new undecided hold_tap
+ht_decide: 1 decided hold (balanced event 3)
+kp_pressed: usage_page 0x07 keycode 0xe0
+ht_binding_pressed: 2 new undecided hold_tap
+ht_binding_released: 0 cleaning up hold-tap
+ht_decide: 2 decided hold (balanced event 3)
+kp_pressed: usage_page 0x07 keycode 0xe3
+ht_binding_pressed: 3 new undecided hold_tap
+ht_binding_released: 1 cleaning up hold-tap
+ht_decide: 3 decided hold (balanced event 3)
+kp_pressed: usage_page 0x07 keycode 0xe2
+kp_released: usage_page 0x07 keycode 0xe1
+kp_released: usage_page 0x07 keycode 0xe0
+kp_released: usage_page 0x07 keycode 0xe3
+ht_binding_released: 2 cleaning up hold-tap
+kp_released: usage_page 0x07 keycode 0xe2
+ht_binding_released: 3 cleaning up hold-tap

app/tests/hold-tap/balanced/many-nested/native_posix.keymap

@@ -0,0 +1,41 @@
+#include <dt-bindings/zmk/keys.h>
+#include <behaviors.dtsi>
+#include <dt-bindings/zmk/kscan-mock.h>
+
+/ {
+	behaviors {
+		ht_bal: behavior_hold_tap_balanced {
+			compatible = "zmk,behavior-hold-tap";
+			label = "HOLD_TAP_BALANCED";
+			#binding-cells = <2>;
+			flavor = "balanced";
+			tapping_term_ms = <300>;
+			bindings = <&kp>, <&kp>;
+		};
+	};
+
+	keymap {
+		compatible = "zmk,keymap";
+		label ="Default keymap";
+
+		default_layer {
+			bindings = <
+				&ht_bal LSFT F &ht_bal LCTL J 
+				&ht_bal LGUI H &ht_bal LALT L
+			>;
+		};
+	};
+};
+
+&kscan {
+	events = <
+	 	ZMK_MOCK_PRESS(0,0,100) 
+		ZMK_MOCK_PRESS(0,1,100) 
+		ZMK_MOCK_PRESS(1,0,100)
+		ZMK_MOCK_PRESS(1,1,100) 
+		ZMK_MOCK_RELEASE(0,0,100) 
+		ZMK_MOCK_RELEASE(0,1,100) 
+		ZMK_MOCK_RELEASE(1,0,100) 
+		ZMK_MOCK_RELEASE(1,1,100) 
+	>;
+};