From be25469b9b481d8f40aeb12aa6de84e1efdc0e68 Mon Sep 17 00:00:00 2001
From: Michael Sparmann <theseven@rockbox.org>
Date: Mon, 5 Oct 2009 20:21:33 +0000
Subject: Reworked iPod Nano 2G PMU code, added RTC and battery ADC.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22967 a1c6a512-1295-4272-9138-f99709370657
---
 .../target/arm/s5l8700/ipodnano2g/pmu-nano2g.c     | 90 ++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 firmware/target/arm/s5l8700/ipodnano2g/pmu-nano2g.c

(limited to 'firmware/target/arm/s5l8700/ipodnano2g/pmu-nano2g.c')

diff --git a/firmware/target/arm/s5l8700/ipodnano2g/pmu-nano2g.c b/firmware/target/arm/s5l8700/ipodnano2g/pmu-nano2g.c
new file mode 100644
index 0000000000..7a6407e809
--- /dev/null
+++ b/firmware/target/arm/s5l8700/ipodnano2g/pmu-nano2g.c
@@ -0,0 +1,90 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright © 2008 Rafaël Carré
+ *
+ * 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 "kernel.h"
+#include "i2c-s5l8700.h"
+
+static struct mutex pmu_adc_mutex;
+int pmu_initialized;
+
+unsigned char pmu_read(int address)
+{
+    unsigned char tmp;
+
+    i2c_read(0xe6, address, 1, &tmp);
+
+    return tmp;
+}
+
+void pmu_write(int address, unsigned char val)
+{
+    i2c_write(0xe6, address, 1, &val);
+}
+
+void pmu_read_multiple(int address, int count, unsigned char* buffer)
+{
+    i2c_read(0xe6, address, count, buffer);
+}
+
+void pmu_write_multiple(int address, int count, unsigned char* buffer)
+{
+    i2c_write(0xe6, address, count, buffer);
+}
+
+void pmu_init(void)
+{
+    if (pmu_initialized) return;
+    mutex_init(&pmu_adc_mutex);
+    pmu_initialized = 1;
+}
+
+int pmu_read_battery_voltage(void)
+{
+    int data = 0;
+    if (!pmu_initialized) pmu_init();
+    mutex_lock(&pmu_adc_mutex);
+    pmu_write(0x54, 0x05);
+    while ((data & 0x80) == 0)
+    {
+        yield();
+        data = pmu_read(0x57);
+    }
+    int millivolts = ((pmu_read(0x55) << 2) | (data & 3)) * 6;
+    mutex_unlock(&pmu_adc_mutex);
+    return millivolts;
+}
+
+int pmu_read_battery_current(void)
+{
+    int data = 0;
+    if (!pmu_initialized) pmu_init();
+    mutex_lock(&pmu_adc_mutex);
+    pmu_write(0x54, 0x25);
+    while ((data & 0x80) == 0)
+    {
+        yield();
+        data = pmu_read(0x57);
+    }
+    int milliamps = (pmu_read(0x55) << 2) | (data & 3);
+    mutex_unlock(&pmu_adc_mutex);
+    return milliamps;
+}
-- 
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