feat(hid): Multi touch trackpad reporting

app/CMakeLists.txt

@@ -87,6 +87,7 @@ target_sources_ifdef(CONFIG_USB_DEVICE_STACK app PRIVATE src/usb.c)
 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_TRACKPAD app PRIVATE src/trackpad.c)
 target_sources(app PRIVATE src/workqueue.c)
 target_sources(app PRIVATE src/main.c)
 

app/Kconfig

@@ -149,6 +149,10 @@ config ZMK_BLE_CONSUMER_REPORT_QUEUE_SIZE
     int "Max number of consumer HID reports to queue for sending over BLE"
     default 5
 
+config ZMK_BLE_PTP_REPORT_QUEUE_SIZE
+    int "Max number of trackpad HID reports to queue for sending over BLE"
+    default 20
+
 config ZMK_BLE_CLEAR_BONDS_ON_START
     bool "Configuration that clears all bond information from the keyboard on startup."
     default n
@@ -308,6 +312,64 @@ endif
 #Display/LED Options
 endmenu
 
+menuconfig ZMK_TRACKPAD
+    bool "Enable ZMK trackpad emulation"
+    default n
+
+config ZMK_TRACKPAD_TICK_DURATION
+    int "Trackpad tick duration in ms"
+    default 8
+
+config ZMK_TRACKPAD_MAX_FINGERS
+    int "Maximum number of fingers reported in PTP"
+    range 3 5
+    default 5
+
+config ZMK_TRACKPAD_PHYSICAL_X
+    int "Maximum X size of trackpad in 0.1cm increments"
+    default 600
+
+config ZMK_TRACKPAD_PHYSICAL_Y
+    int "Maximum Y size of trackpad in 0.1cm increments"
+    default 600
+
+config ZMK_TRACKPAD_LOGICAL_X
+    int "Maximum X coordinate value trackpad can report"
+    default 4095
+
+config ZMK_TRACKPAD_LOGICAL_Y
+    int "Maximum Y coordinate value trackpad can report"
+    default 4095
+
+
+if ZMK_TRACKPAD
+
+choice ZMK_TRACKPAD_WORK_QUEUE
+    prompt "Work queue selection for trackpad events"
+    default ZMK_TRACKPAD_WORK_QUEUE_DEDICATED
+
+config ZMK_TRACKPAD_WORK_QUEUE_SYSTEM
+    bool "Use default system work queue for trackpad events"
+
+config ZMK_TRACKPAD_WORK_QUEUE_DEDICATED
+    bool "Use dedicated work queue for trackpad events"
+
+endchoice
+
+if ZMK_TRACKPAD_WORK_QUEUE_DEDICATED
+
+config ZMK_TRACKPAD_DEDICATED_THREAD_STACK_SIZE
+    int "Stack size for dedicated trackpad thread/queue"
+    default 8192
+
+config ZMK_TRACKPAD_DEDICATED_THREAD_PRIORITY
+    int "Thread priority for dedicated trackpad thread/queue"
+    default 3
+
+endif # ZMK_TRACKPAD_WORK_QUEUE_DEDICATED
+
+endif
+
 menu "Power Management"
 
 config ZMK_BATTERY_REPORTING

app/include/zmk/endpoints.h

@@ -13,3 +13,6 @@ int zmk_endpoints_toggle();
 enum zmk_endpoint zmk_endpoints_selected();
 
 int zmk_endpoints_send_report(uint16_t usage_page);
+#if IS_ENABLED(CONFIG_ZMK_TRACKPAD)
+int zmk_endpoints_send_ptp_report();
+#endif