feat(mouse): Add input configs for data mods.

* Add ability to swap X/Y, invert X and Y values, and apply a
  scalar multiplier/divisor.

Author: petejohanson

app/CMakeLists.txt

@@ -28,6 +28,7 @@ target_sources(app PRIVATE src/activity.c)
 target_sources(app PRIVATE src/kscan.c)
 target_sources(app PRIVATE src/matrix_transform.c)
 target_sources_ifdef(CONFIG_ZMK_MOUSE app PRIVATE src/mouse/main.c)
+target_sources_ifdef(CONFIG_ZMK_MOUSE app PRIVATE src/mouse/input_config.c)
 target_sources(app PRIVATE src/sensors.c)
 target_sources_ifdef(CONFIG_ZMK_WPM app PRIVATE src/wpm.c)
 target_sources(app PRIVATE src/event_manager.c)

app/dts/bindings/zmk,input-configs.yaml

@@ -0,0 +1,24 @@
+description: |
+  Allows post-processing of input events based on the configuration
+
+compatible: "zmk,input-configs"
+
+child-binding:
+  description: "A configuration for a given input device"
+
+  properties:
+    device:
+      type: phandle
+      required: true
+    xy-swap:
+      type: boolean
+    x-invert:
+      type: boolean
+    y-invert:
+      type: boolean
+    scale-multiplier:
+      type: int
+      default: 1
+    scale-divisor:
+      type: int
+      default: 1

app/include/zmk/mouse/input_config.h

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2023 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#pragma once
+
+#include <zephyr/kernel.h>
+#include <zephyr/device.h>
+
+struct zmk_input_config {
+    const struct device *dev;
+    bool xy_swap;
+    bool x_invert;
+    bool y_invert;
+    uint16_t scale_multiplier;
+    uint16_t scale_divisor;
+};
+
+const struct zmk_input_config *zmk_input_config_get_for_device(const struct device *dev);

app/src/behaviors/behavior_input_two_axis.c

@@ -169,15 +169,17 @@ static void tick_work_cb(struct k_work *work) {
     }
 }
 
-static void set_start_times_for_activity(struct movement_state_2d *state) {
-    if (state->x.speed != 0 && state->x.start_time == 0) {
-        state->x.start_time = k_uptime_get();
-    }
-
-    if (state->y.speed != 0 && state->y.start_time == 0) {
-        state->y.start_time = k_uptime_get();
+static void set_start_times_for_activity_1d(struct movement_state_1d *state) {
+    if (state->speed != 0 && state->start_time == 0) {
+        state->start_time = k_uptime_get();
+    } else if (state->speed == 0) {
+        state->start_time = 0;
     }
 }
+static void set_start_times_for_activity(struct movement_state_2d *state) {
+    set_start_times_for_activity_1d(&state->x);
+    set_start_times_for_activity_1d(&state->y);
+}
 
 static void update_work_scheduling(const struct device *dev) {
     struct behavior_input_two_axis_data *data = dev->data;

app/src/mouse/hid_input_listener.c

@@ -9,6 +9,7 @@
 #include <zephyr/dt-bindings/input/input-event-codes.h>
 
 #include <zmk/mouse.h>
+#include <zmk/mouse/input_config.h>
 #include <zmk/endpoints.h>
 #include <zmk/hid.h>
 
@@ -52,7 +53,44 @@ void handle_key_code(struct input_event *evt) {
     }
 }
 
+static void swap_xy(struct input_event *evt) {
+    switch (evt->code) {
+    case INPUT_REL_X:
+        evt->code = INPUT_REL_Y;
+        break;
+    case INPUT_REL_Y:
+        evt->code = INPUT_REL_X;
+        break;
+    }
+}
+
+static void filter_with_input_config(struct input_event *evt) {
+    if (!evt->dev) {
+        return;
+    }
+
+    const struct zmk_input_config *cfg = zmk_input_config_get_for_device(evt->dev);
+
+    if (!cfg) {
+        return;
+    }
+
+    if (cfg->xy_swap) {
+        swap_xy(evt);
+    }
+
+    if ((cfg->x_invert && evt->code == INPUT_REL_X) ||
+        (cfg->y_invert && evt->code == INPUT_REL_Y)) {
+        evt->value = -(evt->value);
+    }
+
+    evt->value = (int16_t)((evt->value * cfg->scale_multiplier) / cfg->scale_divisor);
+}
+
 void input_handler(struct input_event *evt) {
+    // First, filter to update the event data as needed.
+    filter_with_input_config(evt);
+
     switch (evt->type) {
     case INPUT_EV_REL:
         handle_rel_code(evt);

app/src/mouse/input_config.c

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2023 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <zmk/mouse/input_config.h>
+#include <zephyr/device.h>
+
+#define DT_DRV_COMPAT zmk_input_configs
+
+#if DT_HAS_COMPAT_STATUS_OKAY(DT_DRV_COMPAT)
+
+#define CHILD_CONFIG(inst)                                                                         \
+    {                                                                                              \
+        .dev = DEVICE_DT_GET(DT_PHANDLE(inst, device)),                                            \
+        .xy_swap = DT_PROP(inst, xy_swap),                                                         \
+        .x_invert = DT_PROP(inst, x_invert),                                                       \
+        .y_invert = DT_PROP(inst, y_invert),                                                       \
+        .scale_multiplier = DT_PROP(inst, scale_multiplier),                                       \
+        .scale_divisor = DT_PROP(inst, scale_divisor),                                             \
+    },
+
+const struct zmk_input_config configs[] = {DT_INST_FOREACH_CHILD(0, CHILD_CONFIG)};
+
+const struct zmk_input_config *zmk_input_config_get_for_device(const struct device *dev) {
+    for (int i = 0; i < ARRAY_SIZE(configs); i++) {
+        if (configs[i].dev == dev) {
+            return &configs[i];
+        }
+    }
+
+    return NULL;
+}
+
+#else
+
+const struct zmk_input_config *zmk_input_config_get_for_device(const struct device *dev) {
+    return NULL;
+}
+
+#endif

app/tests/mouse-keys/mouse-move/input-configs/move_diagonal_scaling/events.patterns

@@ -0,0 +1 @@
+s/.*hid_mouse_//p

app/tests/mouse-keys/mouse-move/input-configs/move_diagonal_scaling/keycode_events.snapshot

@@ -0,0 +1,22 @@
+movement_update: Mouse movement updated to -1/0
+scroll_set: Mouse scroll set to 0/0
+movement_set: Mouse movement set to 0/0
+movement_update: Mouse movement updated to -3/0
+movement_update: Mouse movement updated to -3/-3
+scroll_set: Mouse scroll set to 0/0
+movement_set: Mouse movement set to 0/0
+movement_update: Mouse movement updated to -3/0
+movement_update: Mouse movement updated to -3/-3
+scroll_set: Mouse scroll set to 0/0
+movement_set: Mouse movement set to 0/0
+movement_update: Mouse movement updated to -5/0
+movement_update: Mouse movement updated to -5/-3
+scroll_set: Mouse scroll set to 0/0
+movement_set: Mouse movement set to 0/0
+movement_update: Mouse movement updated to -5/0
+movement_update: Mouse movement updated to -5/-5
+scroll_set: Mouse scroll set to 0/0
+movement_set: Mouse movement set to 0/0
+movement_update: Mouse movement updated to 0/-5
+scroll_set: Mouse scroll set to 0/0
+movement_set: Mouse movement set to 0/0

app/tests/mouse-keys/mouse-move/input-configs/move_diagonal_scaling/native_posix_64.keymap

@@ -0,0 +1,38 @@
+#include <behaviors.dtsi>
+#include <dt-bindings/zmk/keys.h>
+#include <dt-bindings/zmk/kscan_mock.h>
+#include <dt-bindings/zmk/mouse.h>
+
+/ {
+    keymap {
+        compatible = "zmk,keymap";
+        label ="Default keymap";
+
+        default_layer {
+            bindings = <
+                &mmv MOVE_LEFT &mmv MOVE_UP
+                &none &none
+            >;
+        };
+    };
+
+    input_configs {
+        compatible = "zmk,input-configs";
+
+        mmv {
+            device = <&mmv>;
+            scale-multiplier = <5>;
+            scale-divisor = <3>;
+        };
+    };
+};
+
+
+&kscan {
+    events = <
+        ZMK_MOCK_PRESS(0,0,10)
+        ZMK_MOCK_PRESS(0,1,100)
+        ZMK_MOCK_RELEASE(0,0,10)
+        ZMK_MOCK_RELEASE(0,1,10)
+    >;
+};

app/tests/mouse-keys/mouse-move/input-configs/move_diagonal_xy_invert/events.patterns

@@ -0,0 +1 @@
+s/.*hid_mouse_//p