[alsa-devel] [PATCH 10/11] drivers: char: axd: add ts interface file

[Qais Yousef]

ts (time stamp) interface is required when axd is to perform synchronisation.
since the time stamp hardware is SoC dependent, this file provides the
interface that can be implemented by a different driver to do the necessary
time stamp translation to perform synchronisation inside AXD

Signed-off-by: Qais Yousef <qais.yousef at imgtec.com>
Cc: Arnd Bergmann <arnd at arndb.de>
Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Cc: <alsa-devel at alsa-project.org>
---
 drivers/char/axd/axd_ts_driver.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 drivers/char/axd/axd_ts_driver.h

diff --git a/drivers/char/axd/axd_ts_driver.h b/drivers/char/axd/axd_ts_driver.h
new file mode 100644
index 000000000000..2b99ad4a7adc
--- /dev/null
+++ b/drivers/char/axd/axd_ts_driver.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2014 Imagination Technologies Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * AXD timestamp driver interface.
+ */
+#include <linux/types.h>
+
+/*
+ * Called at the beginning of a stream to set the fixed reference point in time
+ * for the stream. This should not be implemented if the reference point should
+ * not be altered in this way, and is managed through other means.
+ */
+void __attribute__((weak)) axd_ts_reset(void);
+
+/*
+ * Adjusts the provided timestamp from the source to destination formats.
+ * @return Non-zero for failure.
+ */
+int __attribute__((weak)) axd_ts_adjust(u64 *ts);
-- 
2.1.0