From 491ed5ed6a6496b61fe34910a27e6e5416815929 Mon Sep 17 00:00:00 2001
From: Michael Sevakis <jethead71@rockbox.org>
Date: Sun, 21 Dec 2008 19:39:11 +0000
Subject: [PATCH] Gigabeat S: Make tuner_power have the expected behavior
 (return old state). Static i2c node structure and add fmradio_i2c_enable to
 the fmradio i2c API for those that can implement it.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19550 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/export/fmradio_i2c.h                 |  1 +
 .../imx31/gigabeat-s/fmradio-i2c-gigabeat-s.c |  7 ++++++-
 .../target/arm/imx31/gigabeat-s/power-imx31.c | 19 ++++++++++++++-----
 3 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/firmware/export/fmradio_i2c.h b/firmware/export/fmradio_i2c.h
index 5d1252768c..ac3095ebcd 100644
--- a/firmware/export/fmradio_i2c.h
+++ b/firmware/export/fmradio_i2c.h
@@ -23,6 +23,7 @@
 #define FMRADIO_I2C_H
 
 void fmradio_i2c_init(void);
+void fmradio_i2c_enable(bool enable);
 int fmradio_i2c_write(unsigned char address, const unsigned char* buf, int count);
 int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count);
 
diff --git a/firmware/target/arm/imx31/gigabeat-s/fmradio-i2c-gigabeat-s.c b/firmware/target/arm/imx31/gigabeat-s/fmradio-i2c-gigabeat-s.c
index 5e5c4853dd..154e13f9a7 100644
--- a/firmware/target/arm/imx31/gigabeat-s/fmradio-i2c-gigabeat-s.c
+++ b/firmware/target/arm/imx31/gigabeat-s/fmradio-i2c-gigabeat-s.c
@@ -24,7 +24,7 @@
 #include "i2c-imx31.h"
 #include "fmradio_i2c.h"
 
-struct i2c_node si4700_i2c_node =
+static struct i2c_node si4700_i2c_node =
 {
     .num  = I2C2_NUM,
     .ifdr = I2C_IFDR_DIV192, /* 66MHz/.4MHz = 165, closest = 192 = 343750Hz */
@@ -33,6 +33,11 @@ struct i2c_node si4700_i2c_node =
     .addr = (0x20),
 };
 
+void fmradio_i2c_enable(bool enable)
+{
+    i2c_enable_node(&si4700_i2c_node, enable);
+}
+
 int fmradio_i2c_write(unsigned char address, const unsigned char* buf, int count)
 {
     (void)address;
diff --git a/firmware/target/arm/imx31/gigabeat-s/power-imx31.c b/firmware/target/arm/imx31/gigabeat-s/power-imx31.c
index 39724c7b75..727b38bd96 100644
--- a/firmware/target/arm/imx31/gigabeat-s/power-imx31.c
+++ b/firmware/target/arm/imx31/gigabeat-s/power-imx31.c
@@ -28,9 +28,10 @@
 #include "backlight-target.h"
 #include "avic-imx31.h"
 #include "mc13783.h"
-#include "i2c-imx31.h"
+#if CONFIG_TUNER
+#include "fmradio_i2c.h"
+#endif
 
-extern struct i2c_node si4700_i2c_node;
 static unsigned int power_status = POWER_INPUT_NONE;
 
 /* Detect which power sources are present. */
@@ -99,11 +100,18 @@ bool ide_powered(void)
 #if CONFIG_TUNER
 bool tuner_power(bool status)
 {
+    static bool tuner_powered = false;
+
+    if (status == tuner_powered)
+        return status;
+
+    tuner_powered = status;
+
     if (status)
     {
         /* the si4700 is the only thing connected to i2c2 so
            we can diable the i2c module when not in use */
-        i2c_enable_node(&si4700_i2c_node, true);
+        fmradio_i2c_enable(true);
         /* enable the fm chip */
         imx31_regset32(&GPIO1_DR, (1 << 26));
         /* enable CLK32KMCU clock */
@@ -113,13 +121,14 @@ bool tuner_power(bool status)
     {
         /* the si4700 is the only thing connected to i2c2 so
            we can diable the i2c module when not in use */
-        i2c_enable_node(&si4700_i2c_node, false);
+        fmradio_i2c_enable(false);
         /* disable the fm chip */
         imx31_regclr32(&GPIO1_DR, (1 << 26));
         /* disable CLK32KMCU clock */
         mc13783_clear(MC13783_POWER_CONTROL0, MC13783_CLK32KMCUEN);
     }
-    return true;
+
+    return !status;
 }
 #endif /* #if CONFIG_TUNER */