From 56c4e9fa600557242d8b78f5fd8e32c2245b76fc Mon Sep 17 00:00:00 2001
From: Marcin Bukat <marcin.bukat@gmail.com>
Date: Sun, 31 Oct 2010 21:09:34 +0000
Subject: Separate mas35xx lowlevel stuff. Move SH specific bits to target
 tree. FS#11189 by me.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28425 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/drivers/audio/dac3550a.c | 124 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 firmware/drivers/audio/dac3550a.c

(limited to 'firmware/drivers/audio/dac3550a.c')

diff --git a/firmware/drivers/audio/dac3550a.c b/firmware/drivers/audio/dac3550a.c
new file mode 100644
index 0000000000..e13602e481
--- /dev/null
+++ b/firmware/drivers/audio/dac3550a.c
@@ -0,0 +1,124 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id: dac.c 17847 2008-06-28 18:10:04Z bagder $
+ *
+ * Copyright (C) 2002 by Linus Nielsen Feltzing
+ *
+ * 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 "config.h"
+#include "stdbool.h"
+#include "i2c.h"
+#include "debug.h"
+#include "dac3550a.h"
+
+static bool line_in_enabled = false;
+static bool dac_enabled = false;
+
+/* convert tenth of dB volume (-780..+180) to dac3550 register value */
+int tenthdb2reg(int db)
+{
+    if (db < -540)                  /* 3 dB steps */
+        return (db + 780) / 30;
+    else                            /* 1.5 dB steps */
+        return (db + 660) / 15;
+}
+
+int dac_volume(unsigned int left, unsigned int right, bool deemph)
+{
+    int ret = 0;
+    unsigned char buf[3];
+
+    i2c_begin();
+
+    if (left > 0x38)
+        left = 0x38;
+    if (right > 0x38)
+        right = 0x38;
+
+    buf[0] = DAC_REG_WRITE | DAC_AVOL;
+    buf[1] = (left & 0x3f) | (deemph ? 0x40 : 0);
+    buf[2] = right & 0x3f;
+
+    /* send write command */
+    if (i2c_write(DAC_DEV_WRITE,buf,3))
+    {
+        ret = -1;
+    }
+
+    i2c_end();
+    return ret;
+}
+
+/******************************************************************
+** Bit6:  0 = 3V        1 = 5V
+** Bit5:  0 = normal    1 = low power
+** Bit4:  0 = AUX2 off  1 = AUX2 on
+** Bit3:  0 = AUX1 off  1 = AUX1 on
+** Bit2:  0 = DAC off   1 = DAC on
+** Bit1:  0 = stereo    1 = mono
+** Bit0:  0 = normal right amp   1 = inverted right amp
+******************************************************************/
+/* dac_config is called once to initialize it. we will apply
+   our static settings because of the init flow.
+   dac_init -> dac_line_in -> mpeg_init -> dac_config
+*/
+static int dac_config(void)
+{
+    int ret = 0;
+    unsigned char buf[2];
+
+    i2c_begin();
+
+    buf[0] = DAC_REG_WRITE | DAC_GCFG;
+    buf[1] = (dac_enabled ? 0x04 : 0) |
+        (line_in_enabled ? 0x08 : 0);
+
+    /* send write command */
+    if (i2c_write(DAC_DEV_WRITE,buf,2))
+    {
+        ret = -1;
+    }
+
+    i2c_end();
+    return ret;
+}
+
+void dac_enable(bool enable)
+{
+    dac_enabled = enable;
+    dac_config();
+}
+
+void dac_line_in(bool enable)
+{
+    line_in_enabled = enable;
+    dac_config();
+}
+
+void dac_init(void)
+{
+    unsigned char buf[2];
+
+    i2c_begin();
+
+    buf[0] = DAC_REG_WRITE | DAC_SR_REG;
+    buf[1] = 0x07;
+
+    /* send write command */
+    i2c_write(DAC_DEV_WRITE,buf,2);
+    i2c_end();
+}
+
-- 
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