Remove old HAL components and refactored GPS-related code (#583)

- Added generic GPS/GNSS support with device detection, configuration, and persistent settings.
- Improved device and module lifecycle management.
- Added flexible filesystem locking support for displays and storage.
- Improved display-idle and keyboard backlight handling.
- Updated architecture, driver, module, testing, and licensing documentation.
- Removed old HAL device and related code.

Modules/lvgl-module/source/arch/lvgl_esp32.c

@@ -13,19 +13,19 @@ extern void lvgl_devices_detach();
 
 static bool initialized = false;
 
-bool lvgl_lock(void) {
-    if (!initialized) return true; // We allow (fake) locking because it's safe to do so as LVGL is not running yet
-    return lvgl_port_lock(portMAX_DELAY);
+void lvgl_lock(void) {
+    if (!initialized) { return; }
+    lvgl_port_lock(portMAX_DELAY);
 }
 
 bool lvgl_try_lock(uint32_t timeoutTicks) {
-    if (!initialized) return true; // We allow (fake) locking because it's safe to do so as LVGL is not running yet
+    if (!initialized) { return false; }
     // lvgl_port_lock expects milliseconds
     return lvgl_port_lock(timeoutTicks * portTICK_PERIOD_MS);
 }
 
 void lvgl_unlock(void) {
-    if (!initialized) return;
+    if (!initialized) { return; }
     lvgl_port_unlock();
 }
 

Modules/lvgl-module/source/arch/lvgl_posix.c

@@ -13,6 +13,8 @@
 #include <tactility/lvgl_module.h>
 
 extern struct LvglModuleConfig lvgl_module_config;
+extern void lvgl_devices_attach();
+extern void lvgl_devices_detach();
 
 // Mutex for LVGL drawing
 static struct RecursiveMutex lvgl_mutex;
@@ -37,10 +39,9 @@ static void task_unlock(void) {
     recursive_mutex_unlock(&task_mutex);
 }
 
-bool lvgl_lock(void) {
-    if (!lvgl_mutex_initialised) return false;
+void lvgl_lock(void) {
+    if (!lvgl_mutex_initialised) return;
     recursive_mutex_lock(&lvgl_mutex);
-    return true;
 }
 
 bool lvgl_try_lock(uint32_t timeout) {
@@ -71,6 +72,9 @@ static void lvgl_task(void* arg) {
 
     check(!lvgl_task_is_interrupt_requested());
 
+    // Must run from this task (like on_start below), otherwise the display doesn't work.
+    lvgl_devices_attach();
+
     // on_start must be called from the task, otherwise the display doesn't work
     if (lvgl_module_config.on_start) lvgl_module_config.on_start();
 
@@ -89,6 +93,8 @@ static void lvgl_task(void* arg) {
 
     if (lvgl_module_config.on_stop) lvgl_module_config.on_stop();
 
+    lvgl_devices_detach();
+
     task_lock();
     lvgl_task_handle = NULL;
     task_unlock();