Device migrations, driver migrations and more (#575)

Devices/m5stack-tab5/Source/devices/detect.h

@@ -0,0 +1,37 @@
+#pragma once
+
+struct Device;
+
+enum class Tab5Variant {
+    Unknown,
+    V1,  // Older variant: ILI9881C display + GT911 touch (see devices_v1.cpp)
+    V2,  // Newer variant (default): ST7123 display + in-cell touch (see devices_v2.cpp)
+};
+
+// Populated once the device_listener callback in display_detect.cpp has detected which
+// panel/touch variant is present (gated on i2c0 + io_expander0 both reaching
+// DEVICE_EVENT_STARTED). Safe to call from Configuration.cpp's createDevices()/createTouch():
+// kernel_init() (which runs the listener to completion) always finishes before hal::init()
+// invokes createDevices().
+[[nodiscard]] Tab5Variant tab5_get_variant();
+
+// Registers/unregisters the device_listener (display_detect.cpp) that detects the display/touch
+// variant, keyboard and power control devices and dynamically constructs them. Called from
+// module.cpp's start()/stop().
+void tab5_detect_start();
+void tab5_detect_stop();
+
+// --- detect.cpp internals, exposed only for display_detect.cpp's on_display_detect_event() ---
+
+// Records the variant found by probe_variant() below - the only writer of the state
+// getDetectedTab5Variant() reads.
+void tab5_set_variant(Tab5Variant variant);
+
+// Pulses only the LCD + touch reset bits on io_expander0 (see the pinout table in
+// Configuration.cpp). The other io_expander0 pins (speaker enable, RF switch, 5V bus, camera
+// reset) are unrelated to display bring-up and stay owned by Configuration.cpp's initExpander0().
+bool pulse_display_reset_pins(Device* io_expander0);
+
+// Probes i2c0 for a known touch controller address to determine which display/touch variant is
+// present. Must be called after pulse_display_reset_pins().
+Tab5Variant tab5_probe_variant(Device* i2c0);