2 files changed, 45 insertions, 0 deletions

diff --git a/firmware/drivers/audio/cs4398.c b/firmware/drivers/audio/cs4398.c
new file mode 100644
index 0000000000..35aa99d08c
--- /dev/null
+++ b/firmware/drivers/audio/cs4398.c
@@ -0,0 +1,41 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2016 by Roman Stolyarov
+ *
+ * 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.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "system.h"
+#include "cs4398.h"
+#include "config.h"
+#include "audio.h"
+#include "audiohw.h"
+#include "i2c.h"
+
+void cs4398_write_reg(uint8_t reg, uint8_t val)
+{
+    unsigned char buf[2] = {reg, val};
+    i2c_write(CS4398_I2C_ADDR, (unsigned char *)&buf, 2);
+}
+
+uint8_t cs4398_read_reg(uint8_t reg)
+{
+    unsigned char buf[2] = {reg, 0xff};
+    i2c_write(CS4398_I2C_ADDR, (unsigned char *)&buf[0], 1);
+    i2c_read(CS4398_I2C_ADDR, (unsigned char *)&buf[1], 1);
+    return buf[1];
+}
diff --git a/firmware/drivers/audio/sdl.c b/firmware/drivers/audio/sdl.c
index ae66380d16..a8fd2ffa07 100644
--- a/firmware/drivers/audio/sdl.c
+++ b/firmware/drivers/audio/sdl.c
@@ -122,6 +122,10 @@ void audiohw_set_depth_3d(int value)
 void audiohw_set_lineout_volume(int vol_l, int vol_r)
     { (void)vol_l; (void)vol_r; }
 #endif
+#if defined(AUDIOHW_HAVE_FILTER_ROLL_OFF)
+void audiohw_set_filter_roll_off(int value)
+    { (void)value; }
+#endif
 
 void audiohw_close(void) {}