Finalize C <=> C++ interface

src/avclan/hal/cd_timer.h

@@ -0,0 +1,32 @@
+// Copyright (C) 2026 Allen Hill <allenofthehills@gmail.com>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+// CDChanger periodic-timer HAL: the ~1 Hz tick that drives the CD changer's
+// status updates. The timer hardware is target-specific; the CD changer owns
+// what a tick means (see cdchanger.cc). The device polls cdtimer_pending() and
+// clears the tick with cdtimer_clear().
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// One-time hardware bring-up. Leaves the tick disabled.
+void cdtimer_init(void *ptr, void(clbk)(void *), bool(isplay)(void *));
+
+// Reset the count so the next tick is ~1 s out, and enable the tick.
+void cdtimer_reset(void);
+
+// Restore / disable the ~1 Hz tick.
+void cdtimer_restore(void);
+void cdtimer_disable(void);
+
+extern volatile bool cdtimer_pending_flag;
+
+static inline bool cdtimer_pending() { return cdtimer_pending_flag; }
+static inline void cdtimer_clear() { cdtimer_pending_flag = false; }
+
+#ifdef __cplusplus
+}
+#endif