Meizu M3: initial version of battery readout and (uncalibrated) charge/discharge curves

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21812 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 67 insertions, 0 deletions

diff --git a/firmware/target/arm/s5l8700/meizu-m3/powermgmt-m3.c b/firmware/target/arm/s5l8700/meizu-m3/powermgmt-m3.c
new file mode 100644
index 0000000000..3960dab2c1
--- /dev/null
+++ b/firmware/target/arm/s5l8700/meizu-m3/powermgmt-m3.c
@@ -0,0 +1,67 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright © 2009 Bertrik Sikken
+ *
+ * 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 "adc.h"
+#include "adc-target.h"
+#include "powermgmt.h"
+
+/*  Battery voltage calculation and discharge/charge curves for the Meizu M3.
+
+    Battery voltage is calculated under the assumption that the adc full-scale
+    readout represents 3.00V and that the battery ADC channel is fed with
+    exactly half of the battery voltage (through a resistive divider).
+    Discharge and charge curves have not been calibrated yet.
+*/
+
+const unsigned short battery_level_dangerous[BATTERY_TYPES_COUNT] =
+{
+    /* TODO: this is just an initial guess */
+    3400
+};
+
+const unsigned short battery_level_shutoff[BATTERY_TYPES_COUNT] =
+{
+    /* TODO: this is just an initial guess */
+    3300
+};
+
+/* voltages (millivolt) of 0%, 10%, ... 100% when charging disabled */
+const unsigned short percent_to_volt_discharge[BATTERY_TYPES_COUNT][11] =
+{
+    /* TODO: simple uncalibrated curve, linear except for first 10% */
+    { 3300, 3600, 3665, 3730, 3795, 3860, 3925, 3990, 4055, 4120, 4185 }
+};
+
+/* voltages (millivolt) of 0%, 10%, ... 100% when charging enabled */
+const unsigned short percent_to_volt_charge[11] =
+    /* TODO: simple uncalibrated curve, linear except for first 10% */
+    { 3300, 3600, 3665, 3730, 3795, 3860, 3925, 3990, 4055, 4120, 4185 };
+
+/* full-scale ADC readout (2^10) in millivolt */
+#define BATTERY_SCALE_FACTOR 6000
+
+/* Returns battery voltage from ADC [millivolts] */
+unsigned int battery_adc_voltage(void)
+{
+    return (adc_read(ADC_BATTERY) * BATTERY_SCALE_FACTOR) >> 10;
+}
+