GiGA Touch - define a callback function forwarder.

Register a callback function to be called by the zephyr input system.

This new code is only there if it is a GIGA and
CONFIG_INPUT_GT911_INTERRUPT is defined.

This includes adding a callback function that is linked in to the
zephyr build,  and export a function to call to allow us to register
 our own.

Added an init variant to GIGA that if the touch interrupt is enabled,
then it will clear out the old user defined callback if any.

Signed-off-by: Kurt Eckhardt  <kurte@rockisland.com>

Author: KurtE

loader/fixups.c

@@ -50,6 +50,28 @@ int enable_bkp_access(void)
 SYS_INIT(enable_bkp_access, POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
 #endif
 
+#if defined(CONFIG_INPUT)
+#include <zephyr/kernel.h>
+#include <zephyr/device.h>
+#include <zephyr/input/input.h>
+	
+typedef void (*zephyr_input_callback_t)(struct input_event *evt, void *user_data);
+
+static zephyr_input_callback_t zephyr_input_cb = NULL;
+
+void zephyr_input_register_callback(zephyr_input_callback_t cb) {
+	zephyr_input_cb = cb;
+}
+
+static void zephyr_input_callback(struct input_event *evt, void *user_data) {
+	if (zephyr_input_cb) {
+		zephyr_input_cb(evt, user_data);
+    }
+}
+
+INPUT_CALLBACK_DEFINE(NULL, zephyr_input_callback, NULL);
+#endif
+
 #if defined(CONFIG_BOARD_ARDUINO_GIGA_R1) && defined(CONFIG_VIDEO)
 #include <zephyr/kernel.h>
 #include <zephyr/device.h>

loader/llext_exports.c

@@ -141,6 +141,9 @@ FORCE_EXPORT_SYM(video_buffer_alloc);
 FORCE_EXPORT_SYM(video_buffer_release);
 FORCE_EXPORT_SYM(video_set_ctrl);
 #endif
+#if defined(CONFIG_INPUT)
+FORCE_EXPORT_SYM(zephyr_input_register_callback);
+#endif
 
 #if defined(CONFIG_SHARED_MULTI_HEAP)
 FORCE_EXPORT_SYM(shared_multi_heap_aligned_alloc);
@@ -246,4 +249,4 @@ FORCE_EXPORT_SYM(__aeabi_dcmpge);
 
 #if defined (CONFIG_CPP)
 FORCE_EXPORT_SYM(__cxa_pure_virtual);
-#endif
+#endif