From 01ece88198e4cc4168e69ac1c495ab83a2f677ed Mon Sep 17 00:00:00 2001
From: Linus Nielsen Feltzing <linus@haxx.se>
Date: Thu, 23 Feb 2006 16:40:41 +0000
Subject: [PATCH] ADC driver for iAudio X5

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8811 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/drivers/adc.c                      | 16 -----
 firmware/export/adc.h                       | 10 ++-
 firmware/target/coldfire/iaudio/x5/adc-x5.c | 68 +++++++++++++++++++++
 3 files changed, 77 insertions(+), 17 deletions(-)
 create mode 100755 firmware/target/coldfire/iaudio/x5/adc-x5.c

diff --git a/firmware/drivers/adc.c b/firmware/drivers/adc.c
index b71583ca05..e565372fac 100644
--- a/firmware/drivers/adc.c
+++ b/firmware/drivers/adc.c
@@ -332,19 +332,3 @@ void adc_init(void)
 }
 
 #endif
-#ifdef IAUDIO_X5
-unsigned char adc_scan(int channel)
-{
-    return 0;
-}
-
-unsigned short adc_read(int channel)
-{
-    return 0;
-}
-
-void adc_init(void)
-{
-}
-
-#endif
diff --git a/firmware/export/adc.h b/firmware/export/adc.h
index 4082e4b39b..027c7154f0 100644
--- a/firmware/export/adc.h
+++ b/firmware/export/adc.h
@@ -21,7 +21,15 @@
 
 #include "config.h"
 
-#if defined(IRIVER_H100_SERIES) || defined(IRIVER_H300_SERIES)
+#ifdef IAUDIO_X5
+#define NUM_ADC_CHANNELS 3
+
+#define ADC_BUTTONS 0
+#define ADC_REMOTE  1
+#define ADC_BATTERY 2
+#define ADC_UNREG_POWER ADC_BATTERY /* For compatibility */
+
+#elif defined(IRIVER_H100_SERIES) || defined(IRIVER_H300_SERIES)
 #define NUM_ADC_CHANNELS 4
 
 #define ADC_BUTTONS 0
diff --git a/firmware/target/coldfire/iaudio/x5/adc-x5.c b/firmware/target/coldfire/iaudio/x5/adc-x5.c
new file mode 100755
index 0000000000..c67b8b5c98
--- /dev/null
+++ b/firmware/target/coldfire/iaudio/x5/adc-x5.c
@@ -0,0 +1,68 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 by Linus Nielsen Feltzing
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "config.h"
+#include "cpu.h"
+#include "system.h"
+#include "kernel.h"
+#include "thread.h"
+#include "adc.h"
+#include "pcf50606.h"
+
+static unsigned char adcdata[NUM_ADC_CHANNELS];
+
+static int channelnum[] =
+{
+    5,   /* ADC_BUTTONS (ADCIN2) */
+    6,   /* ADC_REMOTE  (ADCIN3) */
+    0,   /* ADC_BATTERY (BATVOLT, resistive divider) */
+};
+
+unsigned char adc_scan(int channel)
+{
+    unsigned char data;
+    
+    pcf50606_write(0x2f, 0x80 | (channelnum[channel] << 1) | 1);
+    data = pcf50606_read(0x30);
+
+    adcdata[channel] = data;
+
+    return data;
+}
+
+unsigned short adc_read(int channel)
+{
+    return adcdata[channel];
+}
+
+static int adc_counter;
+
+static void adc_tick(void)
+{
+    if(++adc_counter == HZ)
+    {
+        adc_counter = 0;
+        adc_scan(ADC_BATTERY);
+    }
+}
+
+void adc_init(void)
+{
+    adc_scan(ADC_BATTERY);
+    tick_add_task(adc_tick);
+}