firmware/target/arm/s5l8700/ipodnano2g/pmu-nano2g.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright © 2008 Rafaël Carré
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #include "config.h"
  23 #include "kernel.h"
  24 #include "i2c-s5l8700.h"
  25 #include "pmu-target.h"
  26
  27 static struct mutex pmu_adc_mutex;
  28
  29 int pmu_read_multiple(int address, int count, unsigned char* buffer)
  30 {
  31     return i2c_read(0xe6, address, count, buffer);
  32 }
  33
  34 int pmu_write_multiple(int address, int count, unsigned char* buffer)
  35 {
  36     return i2c_write(0xe6, address, count, buffer);
  37 }
  38
  39 unsigned char pmu_read(int address)
  40 {
  41     unsigned char tmp;
  42
  43     pmu_read_multiple(address, 1, &tmp);
  44
  45     return tmp;
  46 }
  47
  48 int pmu_write(int address, unsigned char val)
  49 {
  50     return pmu_write_multiple(address, 1, &val);
  51 }
  52
  53 void pmu_init(void)
  54 {
  55     mutex_init(&pmu_adc_mutex);
  56 }
  57
  58 int pmu_read_adc(unsigned int adc)
  59 {
  60     int data = 0;
  61     mutex_lock(&pmu_adc_mutex);
  62     pmu_write(0x54, 5 | (adc << 4));
  63     while ((data & 0x80) == 0)
  64     {
  65         yield();
  66         data = pmu_read(0x57);
  67     }
  68     int value = (pmu_read(0x55) << 2) | (data & 3);
  69     mutex_unlock(&pmu_adc_mutex);
  70     return value;
  71 }
  72
  73 /* millivolts */
  74 int pmu_read_battery_voltage(void)
  75 {
  76     return pmu_read_adc(0) * 6;
  77 }
  78
  79 /* milliamps */
  80 int pmu_read_battery_current(void)
  81 {
  82     return pmu_read_adc(2);
  83 }
  84
  85 void pmu_ldo_on_in_standby(unsigned int ldo, int onoff)
  86 {
  87     if (ldo < 4)
  88     {
  89         unsigned char newval = pmu_read(0x3B) & ~(1 << (2 * ldo));
  90         if (onoff) newval |= 1 << (2 * ldo);
  91         pmu_write(0x3B, newval);
  92     }
  93     else if (ldo < 8)
  94     {
  95         unsigned char newval = pmu_read(0x3C) & ~(1 << (2 * (ldo - 4)));
  96         if (onoff) newval |= 1 << (2 * (ldo - 4));
  97         pmu_write(0x3C, newval);
  98     }
  99 }
 100
 101 void pmu_ldo_set_voltage(unsigned int ldo, unsigned char voltage)
 102 {
 103     if (ldo > 6) return;
 104     pmu_write(0x2d + (ldo << 1), voltage);
 105 }
 106
 107 void pmu_ldo_power_on(unsigned int ldo)
 108 {
 109     if (ldo > 6) return;
 110     pmu_write(0x2e + (ldo << 1), 1);
 111 }
 112
 113 void pmu_ldo_power_off(unsigned int ldo)
 114 {
 115     if (ldo > 6) return;
 116     pmu_write(0x2e + (ldo << 1), 0);
 117 }
 118
 119 void pmu_set_wake_condition(unsigned char condition)
 120 {
 121     pmu_write(0xd, condition);
 122 }
 123
 124 void pmu_enter_standby(void)
 125 {
 126     pmu_write(0xc, 1);
 127 }
 128
 129 void pmu_read_rtc(unsigned char* buffer)
 130 {
 131     pmu_read_multiple(0x59, 7, buffer);
 132 }
 133
 134 void pmu_write_rtc(unsigned char* buffer)
 135 {
 136     pmu_write_multiple(0x59, 7, buffer);
 137 }