firmware/drivers/pcf50605.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Driver for pcf50605 PMU and RTC
  11  *
  12  * Based on code from the ipodlinux project - http://ipodlinux.org/
  13  * Adapted for Rockbox in December 2005
  14  *
  15  * Original file: linux/arch/armnommu/mach-ipod/pcf50605.c
  16  *
  17  * Copyright (c) 2003-2005 Bernard Leach (leachbj@bouncycastle.org)
  18  *
  19  * This program is free software; you can redistribute it and/or
  20  * modify it under the terms of the GNU General Public License
  21  * as published by the Free Software Foundation; either version 2
  22  * of the License, or (at your option) any later version.
  23  *
  24  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  25  * KIND, either express or implied.
  26  *
  27  ****************************************************************************/
  28 #include "system.h"
  29 #include "config.h"
  30 #if CONFIG_I2C == I2C_PP5020 || CONFIG_I2C == I2C_PP5002
  31 #include "i2c-pp.h"
  32 #endif
  33 #include "rtc.h"
  34 #include "pcf5060x.h"
  35
  36 unsigned char pcf50605_wakeup_flags = 0;
  37
  38 int pcf50605_read(int address)
  39 {
  40     return i2c_readbyte(0x8,address);
  41 }
  42
  43 int pcf50605_read_multiple(int address, unsigned char* buf, int count)
  44 {
  45     int read = i2c_readbytes(0x08, address, count, buf);
  46     return read - count;
  47 }
  48
  49 int pcf50605_write(int address, unsigned char val)
  50 {
  51     pp_i2c_send(0x8, address, val);
  52     return 0;
  53 }
  54
  55 int pcf50605_write_multiple(int address, const unsigned char* buf, int count)
  56 {
  57     int i;
  58
  59     i2c_lock();
  60
  61     for (i = 0; i < count; i++)
  62         pp_i2c_send(0x8, address + i, buf[i]);
  63
  64     i2c_unlock();
  65
  66     return 0;
  67 }
  68
  69 /* The following command puts the iPod into a deep sleep.  Warning
  70    from the good people of ipodlinux - never issue this command
  71    without setting CHGWAK or EXTONWAK if you ever want to be able to
  72    power on your iPod again. */
  73 void pcf50605_standby_mode(void)
  74 {
  75     pcf50605_write(PCF5060X_OOCC1,
  76                    GOSTDBY | CHGWAK | EXTONWAK | pcf50605_wakeup_flags);
  77 }
  78
  79 void pcf50605_init(void)
  80 {
  81 #if (defined (IPOD_VIDEO) || defined (IPOD_NANO))
  82     /* I/O and GPO voltage supply. ECO not allowed regarding data sheet. Defaults:
  83      * iPod Video = 0xf8 = 3.3V ON
  84      * iPod nano  = 0xf5 = 3.0V ON */
  85     pcf50605_write(PCF5060X_IOREGC,  0xf5); /* 3.0V ON */
  86
  87     /* Core voltage supply. ECO not stable, assumed due to less precision of
  88      * voltage in ECO mode. DCDC2 is not relevant as this may be used for
  89      * voltage scaling. Default is 1.2V ON for PP5022/PP5024 */
  90     pcf50605_write(PCF5060X_DCDC1,   0xec); /* 1.2V ON */
  91     pcf50605_write(PCF5060X_DCDC2,   0x0c); /* OFF */
  92
  93     /* Unknown. Defaults:
  94      * iPod Video = 0xe3 = 1.8V ON
  95      * iPod nano  = 0xe3 = 1.8V ON */
  96     pcf50605_write(PCF5060X_DCUDC1,  0xe3); /* 1.8V ON */
  97
  98     /* Codec voltage supply. ECO not allowed as max. current of 5mA is not
  99      * sufficient. Defaults:
 100      * iPod Video = 0xf5 = 3.0V ON
 101      * iPod nano  = 0xef = 2.4V ON */
 102     pcf50605_write(PCF5060X_D1REGC1, 0xf0); /* 2.5V ON */
 103
 104     /* PCF5060X_D2REGC1 is set in accordance to the accessory power setting */
 105
 106     /* LCD voltage supply. Defaults:
 107      * iPod Video = 0xf5 = 3.0V ON
 108      * iPod nano  = 0xf5 = 3.0V ON */
 109     pcf50605_write(PCF5060X_D3REGC1, 0xf1); /* 2.6V ON */
 110
 111     /* PCF5060X_LPREGC1 is leaved untouched as the setting varies over the
 112      * different iPod platforms. Defaults:
 113      * iPod Video = 0x1f = 0ff
 114      * iPod nano  = 0xf6 = 3.1V ON */
 115 #else
 116     /* keep initialization from svn for other iPods */
 117     pcf50605_write(PCF5060X_D1REGC1, 0xf5); /* 3.0V ON */
 118     pcf50605_write(PCF5060X_D3REGC1, 0xf5); /* 3.0V ON */
 119 #endif
 120 }