feat(mouse): Add PS/2 mouse/trackpoint/etc support

app/CMakeLists.txt

@@ -96,6 +96,8 @@ target_sources_ifdef(CONFIG_ZMK_USB app PRIVATE src/usb_hid.c)
 target_sources_ifdef(CONFIG_ZMK_RGB_UNDERGLOW app PRIVATE src/rgb_underglow.c)
 target_sources_ifdef(CONFIG_ZMK_BACKLIGHT app PRIVATE src/backlight.c)
 target_sources_ifdef(CONFIG_ZMK_LOW_PRIORITY_WORK_QUEUE app PRIVATE src/workqueue.c)
+target_sources_ifdef(CONFIG_ZMK_MOUSE_PS2 app PRIVATE src/mouse/mouse_ps2.c)
+target_sources_ifdef(CONFIG_ZMK_MOUSE_PS2 app PRIVATE src/behaviors/behavior_mouse_setting.c)
 target_sources(app PRIVATE src/main.c)
 
 add_subdirectory(src/display/)

app/dts/arm/nordic/override.dtsi

@@ -0,0 +1 @@
+#define NRF_DEFAULT_IRQ_PRIORITY 3

app/dts/behaviors.dtsi

@@ -19,4 +19,5 @@
 #include <behaviors/key_repeat.dtsi>
 #include <behaviors/backlight.dtsi>
 #include <behaviors/macros.dtsi>
+#include <behaviors/mouse_setting.dtsi>
 #include <behaviors/mouse_key_press.dtsi>

app/dts/behaviors/mouse_setting.dtsi

@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+/ {
+	behaviors {
+		mms: behavior_mouse_setting {
+			compatible = "zmk,behavior-mouse-setting";
+			label = "MOUSE_SETTING";
+			#binding-cells = <1>;
+		};
+	};
+};

app/dts/bindings/behaviors/zmk,behavior-mouse-setting.yaml

@@ -0,0 +1,6 @@
+description: Mouse Setting
+
+compatible: "zmk,behavior-mouse-setting"
+
+include: one_param.yaml
+

app/dts/bindings/zmk,mouse-ps2.yaml

@@ -0,0 +1,15 @@
+description: PS2 mouse configuration
+
+compatible: "zmk,mouse-ps2"
+
+properties:
+  ps2-device:
+    type: phandle
+    required: true
+    description: |
+      The ps2 device the mouse should use.
+
+  rst-gpios:
+    type: phandle-array
+    required: false
+    description: GPIO to which the RST pin of the device is connected and on which the Power-On-Reset will be performed.

app/include/dt-bindings/zmk/mouse_settings.h

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+#pragma once
+
+#define MS_TP_SENSITIVITY_INCR 10
+#define MS_TP_SENSITIVITY_DECR 11
+
+#define MS_TP_NEG_INERTIA_INCR 12
+#define MS_TP_NEG_INERTIA_DECR 13
+
+#define MS_TP_VALUE6_INCR 14
+#define MS_TP_VALUE6_DECR 15
+
+#define MS_TP_PTS_THRESHOLD_INCR 16
+#define MS_TP_PTS_THRESHOLD_DECR 17

app/include/zmk/mouse_ps2.h

@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2021 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#pragma once
+
+int zmk_mouse_ps2_tp_sensitivity_change(int amount);
+int zmk_mouse_ps2_tp_neg_inertia_change(int amount);
+int zmk_mouse_ps2_tp_value6_upper_plateau_speed_change(int amount);
+int zmk_mouse_ps2_tp_pts_threshold_change(int amount);

app/src/behaviors/behavior_mouse_setting.c

@@ -0,0 +1,86 @@
+#define DT_DRV_COMPAT zmk_behavior_mouse_setting
+
+#include <zephyr/device.h>
+#include <drivers/behavior.h>
+#include <zephyr/logging/log.h>
+
+#include <dt-bindings/zmk/mouse_settings.h>
+#include <zmk/mouse_ps2.h>
+#include <zmk/mouse.h>
+
+#define INCREMENT_TP_SENSITIVITY 10
+#define INCREMENT_TP_NEG_INERTIA 1
+#define INCREMENT_TP_VALUE6 5
+#define INCREMENT_TP_PTS_THRESHOLD 1
+
+LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
+
+static int on_keymap_binding_pressed(struct zmk_behavior_binding *binding,
+                                     struct zmk_behavior_binding_event event)
+{
+    switch (binding->param1) {
+
+        case MS_TP_SENSITIVITY_INCR:
+            return zmk_mouse_ps2_tp_sensitivity_change(
+                INCREMENT_TP_SENSITIVITY
+            );
+        case MS_TP_SENSITIVITY_DECR:
+            return zmk_mouse_ps2_tp_sensitivity_change(
+                -INCREMENT_TP_SENSITIVITY
+            );
+
+        case MS_TP_NEG_INERTIA_INCR:
+            return zmk_mouse_ps2_tp_neg_inertia_change(
+                INCREMENT_TP_NEG_INERTIA
+            );
+        case MS_TP_NEG_INERTIA_DECR:
+            return zmk_mouse_ps2_tp_neg_inertia_change(
+                -INCREMENT_TP_NEG_INERTIA
+            );
+
+        case MS_TP_VALUE6_INCR:
+            return zmk_mouse_ps2_tp_value6_upper_plateau_speed_change(
+                INCREMENT_TP_VALUE6
+            );
+        case MS_TP_VALUE6_DECR:
+            return zmk_mouse_ps2_tp_value6_upper_plateau_speed_change(
+                -INCREMENT_TP_VALUE6
+            );
+
+        case MS_TP_PTS_THRESHOLD_INCR:
+            return zmk_mouse_ps2_tp_pts_threshold_change(
+                INCREMENT_TP_PTS_THRESHOLD
+            );
+        case MS_TP_PTS_THRESHOLD_DECR:
+            return zmk_mouse_ps2_tp_pts_threshold_change(
+                -INCREMENT_TP_PTS_THRESHOLD
+            );
+    }
+
+    return -ENOTSUP;
+}
+
+static int on_keymap_binding_released(struct zmk_behavior_binding *binding,
+                                      struct zmk_behavior_binding_event event)
+{
+    return ZMK_BEHAVIOR_OPAQUE;
+}
+
+// Initialization Function
+static int zmk_behavior_mouse_setting_init(const struct device *dev) {
+    return 0;
+};
+
+static const struct behavior_driver_api
+zmk_behavior_mouse_setting_driver_api = {
+    .binding_pressed = on_keymap_binding_pressed,
+    .binding_released = on_keymap_binding_released
+};
+
+DEVICE_DT_INST_DEFINE(
+    0,
+    zmk_behavior_mouse_setting_init, NULL,
+    NULL, NULL,
+    APPLICATION, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
+    &zmk_behavior_mouse_setting_driver_api
+);

app/src/mouse/Kconfig

@@ -0,0 +1,61 @@
+# Copyright (c) 2023 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+DT_COMPAT_ZMK_PS2_MOUSE := zmk,mouse-ps2
+
+config ZMK_MOUSE
+    bool "Enable ZMK mouse emulation"
+    default n
+    select INPUT
+    select INPUT_THREAD_PRIORITY_OVERRIDE
+
+config ZMK_MOUSE_PS2
+	bool
+	default $(dt_compat_enabled,$(DT_COMPAT_ZMK_PS2_MOUSE))
+    depends on (!ZMK_SPLIT || ZMK_SPLIT_ROLE_CENTRAL)
+	select ZMK_MOUSE
+    select PS2
+
+if ZMK_MOUSE_PS2
+
+config ZMK_MOUSE_PS2_SAMPLING_RATE
+    int "Sets how many mouse activity reports should be sent per second. The default is 100. You can reduce this setting if you see a lot of PS/2 transmission errors. Increasing it will not lead to significant improvements, because mouse reports are accumulated and only sent over bluetooth every `CONFIG_ZMK_MOUSE_TICK_DURATION` ms."
+	default 100
+
+config ZMK_MOUSE_PS2_ENABLE_CLICKING
+    bool "Enables clicking events."
+	default y
+
+config ZMK_MOUSE_PS2_INVERT_X
+    bool "Invert the mouse movement x axis."
+	default n
+
+config ZMK_MOUSE_PS2_INVERT_Y
+    bool "Invert the mouse movement y axis."
+	default n
+
+config ZMK_MOUSE_PS2_SWAP_XY
+    bool "Swaps the X and Y axis."
+	default n
+
+config ZMK_MOUSE_PS2_SCROLL
+    bool "Enable scroll wheel on mouse devices supporting the Intellimouse extension."
+	default n
+
+config ZMK_MOUSE_PS2_TP_TAP_TO_SELECT
+    bool "Enables the ability to left-click by tapping the trackpoint."
+	default n
+
+config ZMK_MOUSE_PS2_TP_INVERT_X
+    bool "Inverts x on the trackpoint. This is sets the setting directly in the trackpoint firmware and should therefore correctly impact the trackpoint algorithms."
+	default n
+
+config ZMK_MOUSE_PS2_TP_INVERT_Y
+    bool "Inverts y on the trackpoint. This is sets the setting directly in the trackpoint firmware and should therefore correctly impact the trackpoint algorithms."
+	default n
+
+config ZMK_MOUSE_PS2_TP_SWAP_XY
+    bool "Swaps the x and y axis on the trackpoint. This is sets the swap settingin the trackpoint firmware and should therefore correctly impact the trackpoint algorithms. But this setting is not supported by all trackpoints."
+	default n
+
+endif # ZMK_MOUSE_PS2