GiGA Touch - define a callback function forwarder.

Added the ability to 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: kurte <kurte@rockisland.com>

Author: KurtE

loader/fixups.c

@@ -39,16 +39,49 @@ SYS_INIT(disable_bootloader_mpu, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEFAU
 SYS_INIT(disable_mpu_rasr_xn, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
 #endif
 
-#if defined(CONFIG_BOARD_ARDUINO_GIGA_R1) && defined(CONFIG_VIDEO)
+
+#if defined(CONFIG_BOARD_ARDUINO_GIGA_R1)  && defined(CONFIG_INPUT_GT911_INTERRUPT)
 #include <zephyr/kernel.h>
 #include <zephyr/device.h>
-#include <zephyr/drivers/clock_control.h>
 #include <zephyr/logging/log.h>
 
+#include <zephyr/input/input.h>
+
+// experiment to try to capture touch screen events
+void (*_giga_touch_callback)(struct input_event *evt, void *user_data) = 0;
+
+void registerGigaTouchCallback(void (*cb)(struct input_event *evt, void *user_data))
+{
+	_giga_touch_callback = cb;
+}
+
+
+void touch_event_callback(struct input_event *evt, void *user_data)
+{
+    //printk("touch_event_callback(%p %p): %p %u %u %u %d\n", evt, user_data,
+    //        evt->dev, evt->sync, evt->type, evt->code, evt->value);
+	if (_giga_touch_callback) {
+		(*_giga_touch_callback)(evt, user_data);
+	}
+}
+
+static const struct device *const touch_dev = DEVICE_DT_GET(DT_CHOSEN(zephyr_touch));
+INPUT_CALLBACK_DEFINE(touch_dev, touch_event_callback, NULL);
+
+#endif
+
+#if (defined(CONFIG_BOARD_ARDUINO_GIGA_R1) || defined(CONFIG_BOARD_ARDUINO_PORTENTA_H7)) \
+		&& defined(CONFIG_VIDEO)
+#include <zephyr/kernel.h>
+#include <zephyr/device.h>
+#include <zephyr/logging/log.h>
+#include <zephyr/drivers/clock_control.h>
+
 int camera_ext_clock_enable(void)
 {
 	int ret;
 	uint32_t rate;
+
 	const struct device *cam_ext_clk_dev = DEVICE_DT_GET(DT_NODELABEL(pwmclock));
 
 	if (!device_is_ready(cam_ext_clk_dev)) {

loader/llext_exports.c

@@ -134,6 +134,9 @@ FORCE_EXPORT_SYM(video_buffer_alloc);
 FORCE_EXPORT_SYM(video_buffer_release);
 FORCE_EXPORT_SYM(video_set_ctrl);
 #endif
+#if defined(CONFIG_BOARD_ARDUINO_GIGA_R1) && defined(CONFIG_INPUT_GT911_INTERRUPT)
+FORCE_EXPORT_SYM(registerGigaTouchCallback);
+#endif
 
 #if defined(CONFIG_SHARED_MULTI_HEAP)
 FORCE_EXPORT_SYM(shared_multi_heap_aligned_alloc);

variants/arduino_giga_r1_stm32h747xx_m7/variant.cpp

@@ -6,3 +6,12 @@ void _on_1200_bps() {
     *(__IO uint32_t *)tmp = (uint32_t)0xDF59;
     NVIC_SystemReset();
 }
+
+#if defined(CONFIG_BOARD_ARDUINO_GIGA_R1)  && defined(CONFIG_INPUT_GT911_INTERRUPT)
+extern "C" void registerGigaTouchCallback(void (*cb)(struct input_event *evt, void *user_data));
+void initVariant(void) {
+    // Make sure to set to NULL in case previous sketch or pvevious build of sketch
+    // set a callback, whoes pointer may not be valid
+    registerGigaTouchCallback(nullptr);
+}
+#endif