pkg/tinyusb: use auto_init for tinyusb stack and thread setup

pkg/tinyusb/Kconfig

@@ -42,6 +42,15 @@ menuconfig PACKAGE_TINYUSB
 
 if PACKAGE_TINYUSB
 
+config MODULE_AUTO_INIT_TINYUSB
+    bool "Auto-initialize the tinyUSB package"
+    default y
+    depends on MODULE_AUTO_INIT
+    help
+        The tinyUSB stack including the used peripherals are initialized
+        automatically at startup. Additionally, the auto-initialization
+        starts the tinyUSB thread.
+
 config MODULE_TINYUSB_COMMON
     bool
     help

pkg/tinyusb/Makefile.dep

@@ -6,6 +6,8 @@ USEMODULE += tinyusb_common
 USEMODULE += tinyusb_contrib
 USEMODULE += tinyusb_hw
 
+DEFAULT_MODULE += auto_init_tinyusb
+
 ifeq (,$(filter tinyusb_class_%,$(USEMODULE)))
   $(error At least one tinyusb_class_* module has to be enabled)
 endif

pkg/tinyusb/contrib/tinyusb.c

@@ -16,6 +16,10 @@
 #include "tinyusb.h"
 #include "tinyusb_hw.h"
 
+#if IS_USED(MODULE_AUTO_INIT)
+#include "auto_init_utils.h"
+#endif
+
 #define ENABLE_DEBUG    0
 #include "debug.h"
 
@@ -79,3 +83,12 @@ int tinyusb_setup(void)
 
     return 0;
 }
+
+void tinyusb_auto_init(void)
+{
+    tinyusb_setup();
+}
+
+#if IS_USED(MODULE_AUTO_INIT_TINYUSB)
+AUTO_INIT(tinyusb_auto_init, AUTO_INIT_PRIO_MOD_TINYUSB);
+#endif

pkg/tinyusb/doc.txt

@@ -26,14 +26,17 @@
  *   USEMODULE += tinyusb_class_cdc tinyusb_class_msc
  *   ```
  *
- * Add `tinyusb_setup()` to your main function to initialize the tinyUSB stack
- * including used peripherals and to start the tinyUSB thread.
+ * Either add `tinyusb_setup()` to your main function to explicitly initialize
+ * the tinyUSB stack including the used peripherals and start the tinyUSB
+ * thread, or use the `auto_init` module (**default**).
+ *
  * ```c
  * int main(void)
  * {
  *     ...
+ *     // If auto-initialization is not used (module `auto_init`),
  *     // initialize the tinyUSB stack including used peripherals and
- *     // start the tinyUSB thread
+ *     // start the tinyUSB thread. Auto-initialization is used by default.
  *     tinyusb_setup();
  *
  *     while (1) {

sys/auto_init/include/auto_init_priorities.h

@@ -239,6 +239,12 @@ extern "C" {
  */
 #define AUTO_INIT_PRIO_MOD_USBUS                        1350
 #endif
+#ifndef AUTO_INIT_PRIO_MOD_TINYUSB
+/**
+ * @brief   tinyUSB priority
+ */
+#define AUTO_INIT_PRIO_MOD_TINYUSB                      1350
+#endif
 #ifndef AUTO_INIT_PRIO_MOD_GNRC_NETIF
 /**
  * @brief   GNRC netif priority

tests/pkg_tinyusb_cdc_msc/main.c

@@ -88,9 +88,12 @@ int main(void)
                   THREAD_CREATE_WOUT_YIELD | THREAD_CREATE_STACKTEST,
                   led_thread_impl, NULL, "led");
 
-    /* initialize the tinyUSB stack including used peripherals and
-     * start the tinyUSB thread */
-    tinyusb_setup();
+    if (!IS_USED(MODULE_AUTO_INIT)) {
+        /* If auto-initialization is not used (module `auto_init`),
+         * initialize the tinyUSB stack including used peripherals and
+         * start the tinyUSB thread. Auto-initialization is used by default. */
+        tinyusb_setup();
+    }
 
     while (1) {
         ztimer_sleep(ZTIMER_MSEC, 10);