Sansa Connect: Remove fake battery voltage scale

Use battery percentage as reported by AVR.

Change-Id: Id697d460b240798eb0b103f9e1f419906b87e9ca

firmware/SOURCES

@@ -1263,7 +1263,6 @@ target/arm/tms320dm320/sansa-connect/crt0-board.S
 target/arm/tms320dm320/sansa-connect/lcd-sansaconnect.c
 target/arm/tms320dm320/sansa-connect/adc-sansaconnect.c
 target/arm/tms320dm320/sansa-connect/power-sansaconnect.c
-target/arm/tms320dm320/sansa-connect/powermgmt-sansaconnect.c
 target/arm/tms320dm320/sansa-connect/tnetv105_cppi.c
 target/arm/tms320dm320/sansa-connect/tnetv105_usb_drv.c
 target/arm/tms320dm320/sansa-connect/usb-sansaconnect.c

firmware/export/config/sansaconnect.h

@@ -147,7 +147,7 @@
 #define BATTERY_CAPACITY_INC 100     /* capacity increment */
 #define BATTERY_TYPES_COUNT  1       /* only one type */
 
-#define CONFIG_BATTERY_MEASURE VOLTAGE_MEASURE
+#define CONFIG_BATTERY_MEASURE PERCENTAGE_MEASURE
 
 /* define current usage levels */
 #if 0
@@ -156,9 +156,6 @@
 #define CURRENT_BACKLIGHT  200
 #endif
 
-/* Hardware controlled charging with monitoring */
-//#define CONFIG_CHARGING CHARGING_MONITOR
-
 #define CONFIG_CPU DM320
 
 #define CONFIG_I2C I2C_DM320

firmware/target/arm/tms320dm320/sansa-connect/avr-sansaconnect.c

@@ -79,6 +79,8 @@ static const char btn_thread_name[] = "buttons";
 static struct event_queue btn_queue;
 #endif
 
+static int current_battery_level = 100;
+
 static inline unsigned short be2short(unsigned char* buf)
 {
    return (unsigned short)((buf[0] << 8) | buf[1]);
@@ -284,8 +286,11 @@ void avr_hid_init(void)
     mutex_init(&avr_mtx);
 }
 
-/* defined in powermgmt-sansaconnect.c */
+int _battery_level(void)
-void set_battery_level(unsigned int level);
+{
+    /* Force shutoff when level read by AVR is 4 or lower */
+    return (current_battery_level > 4) ? current_battery_level : 0;
+}
 
 static void avr_hid_get_state(void)
 {
@@ -302,7 +307,7 @@ static void avr_hid_get_state(void)
      *  buf[8] contains some battery/charger related information (unknown)
      *  buf[9] contains battery level in percents (0-100)
      */
-    set_battery_level((unsigned int)buf[9]);
+    current_battery_level = (int)buf[9];
 
     spi_txrx(cmd_empty, NULL, 1); /* request interrupt on button press */
 

firmware/target/arm/tms320dm320/sansa-connect/powermgmt-sansaconnect.c

@@ -1,65 +0,0 @@
-/***************************************************************************
- *             __________               __   ___.
- *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
- *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
- *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
- *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
- *                     \/            \/     \/    \/            \/
- * $Id: $
- *
- * Copyright (C) 2011 by Tomasz Moń
- *
- * 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 "powermgmt.h"
-#include "kernel.h"
-
-/* Use fake linear scale as AVR does the voltage to percentage conversion */
-
-static unsigned int current_battery_level = 100;
-
-/* This specifies the battery level that writes are still safe */
-const unsigned short battery_level_dangerous[BATTERY_TYPES_COUNT] =
-{
-    5
-};
-
-/* Below this the player cannot be considered to operate reliably */
-const unsigned short battery_level_shutoff[BATTERY_TYPES_COUNT] =
-{
-    4
-};
-
-/* voltages (millivolt) of 0%, 10%, ... 100% when charging disabled */
-const unsigned short percent_to_volt_discharge[BATTERY_TYPES_COUNT][11] =
-{
-    { 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 },
-};
-
-/* voltages (millivolt) of 0%, 10%, ... 100% when charging enabled */
-const unsigned short percent_to_volt_charge[11] =
-{
-    0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100,
-};
-
-/* Returns battery voltage from ADC [millivolts] */
-int _battery_voltage(void)
-{
-    return current_battery_level;
-}
-
-void set_battery_level(unsigned int level)
-{
-    current_battery_level = level;
-}
-