From c1621488e8915fa42a64d03d66d68e4368838d7e Mon Sep 17 00:00:00 2001
From: Kurt Eckhardt <kurte@rockisland.com>
Date: Thu, 5 Jun 2025 08:05:07 -0700
Subject: [PATCH] GiGA Touch - define a callback function forwarder.

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

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.

Signed-off-by: Kurt Eckhardt  <kurte@rockisland.com>
---
 loader/fixups.c        | 21 +++++++++++++++++++++
 loader/llext_exports.c |  5 ++++-
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/loader/fixups.c b/loader/fixups.c
index 7b320deb..22129659 100644
--- a/loader/fixups.c
+++ b/loader/fixups.c
@@ -50,6 +50,27 @@ 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>
diff --git a/loader/llext_exports.c b/loader/llext_exports.c
index f70575d2..9ba63368 100644
--- a/loader/llext_exports.c
+++ b/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
\ No newline at end of file
+#endif