From 3828c7d98202edf885faa978e928760576666a6a Mon Sep 17 00:00:00 2001
From: Thom Johansen <thomj@rockbox.org>
Date: Thu, 16 Jun 2005 20:16:58 +0000
Subject: Balance support for UDA1380 based players.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6730 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/drivers/uda1380.c | 23 +++++++++++++++++++++--
 firmware/export/uda1380.h  |  1 +
 firmware/sound.c           |  2 ++
 3 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/firmware/drivers/uda1380.c b/firmware/drivers/uda1380.c
index 4eb04d1ba3..bcc94474fa 100644
--- a/firmware/drivers/uda1380.c
+++ b/firmware/drivers/uda1380.c
@@ -38,6 +38,8 @@
 
 int uda1380_write_reg(unsigned char reg, unsigned short value);
 unsigned short uda1380_regs[0x30];
+short uda1380_balance;
+short uda1380_volume;
 
 /* Definition of a playback configuration to start with */
 
@@ -90,8 +92,23 @@ int uda1380_write_reg(unsigned char reg, unsigned short value)
  */
 int uda1380_setvol(int vol)
 {
+    int vol_l, vol_r;
+
+    uda1380_volume = vol;
+    /* Simple linear volume crossfade curves */
+    vol_l = MAX(uda1380_balance*0xff/100, 0);
+    vol_r = MAX(-uda1380_balance*0xff/100, 0);
     return uda1380_write_reg(REG_MASTER_VOL,
-                             MASTER_VOL_LEFT(vol) | MASTER_VOL_RIGHT(vol));
+                             MASTER_VOL_LEFT(vol_l) | MASTER_VOL_RIGHT(vol_r));
+}
+
+/**
+ * Sets stereo balance
+ */
+void uda1380_set_balance(int bal)
+{
+    uda1380_balance = bal;
+    uda1380_setvol(uda1380_volume);
 }
 
 /** 
@@ -165,7 +182,9 @@ int uda1380_init(void)
 {
     if (uda1380_set_regs() == -1)
         return -1;
-    
+    uda1380_balance = 0;
+    uda1380_volume = 0x20; /* Taken from uda1380_defaults */
+
     return 0;
 }
 
diff --git a/firmware/export/uda1380.h b/firmware/export/uda1380.h
index f7e97e13c7..b09d271808 100644
--- a/firmware/export/uda1380.h
+++ b/firmware/export/uda1380.h
@@ -23,6 +23,7 @@
 extern int uda1380_init(void);
 extern void uda1380_enable_output(bool enable);
 extern int uda1380_setvol(int vol);
+extern void uda1380_set_balance(int bal);
 extern void uda1380_set_bass(int value);
 extern void uda1380_set_treble(int value);
 extern int uda1380_mute(int mute);
diff --git a/firmware/sound.c b/firmware/sound.c
index 7558a3349b..7dd1fbf98e 100644
--- a/firmware/sound.c
+++ b/firmware/sound.c
@@ -491,6 +491,8 @@ void sound_set(int setting, int value)
 #elif CONFIG_HWCODEC == MAS3507D
             current_balance = value * 960 / 100; /* tenth of dB */
             set_prescaled_volume();
+#elif defined(HAVE_UDA1380)
+            uda1380_set_balance(value);
 #endif
             break;
 
-- 
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