1 files changed, 81 insertions, 0 deletions

diff --git a/firmware/target/arm/ipod/adc-ipod-pcf.c b/firmware/target/arm/ipod/adc-ipod-pcf.c
new file mode 100644
index 0000000000..bc2524de5d
--- /dev/null
+++ b/firmware/target/arm/ipod/adc-ipod-pcf.c
@@ -0,0 +1,81 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 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 "string.h"
+#include "adc.h"
+#include "pcf50605.h"
+
+struct adc_struct {
+    long timeout;
+    void (*conversion)(unsigned short *data);
+    short channelnum;
+    unsigned short data;
+};
+
+static struct adc_struct adcdata[NUM_ADC_CHANNELS] IDATA_ATTR;
+
+static unsigned short _adc_read(struct adc_struct *adc)
+{
+    if (adc->timeout < current_tick) {
+        unsigned char data[2];
+        unsigned short value;
+        /* 5x per 2 seconds */
+        adc->timeout = current_tick + (HZ * 2 / 5);
+
+        /* ADCC1, 10 bit, start */
+        pcf50605_write(0x2f, (adc->channelnum << 1) | 0x1);
+        pcf50605_read_multiple(0x30, data, 2); /* ADCS1, ADCS2 */
+        value   = data[0];
+        value <<= 2;
+        value  |= data[1] & 0x3;
+
+        if (adc->conversion) {
+            adc->conversion(&value);
+        }
+        adc->data = value;
+        return value;
+    } else
+    {
+        return adc->data;
+    }
+}
+
+/* Force an ADC scan _now_ */
+unsigned short adc_scan(int channel) {
+    struct adc_struct *adc = &adcdata[channel];
+    adc->timeout = 0;
+    return _adc_read(adc);
+}
+
+/* Retrieve the ADC value, only does a scan periodically */
+unsigned short adc_read(int channel) {
+    return _adc_read(&adcdata[channel]);
+}
+
+void adc_init(void)
+{
+    struct adc_struct *adc_battery = &adcdata[ADC_BATTERY];
+    adc_battery->channelnum = 0x2; /* ADCVIN1, resistive divider */
+    adc_battery->timeout = 0;
+    _adc_read(adc_battery);
+}