firmware/drivers/pcf50606.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2008 by Rob Purchase
  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 #include "pcf50606.h"
  22 #include "i2c.h"
  23
  24 #define PCF50606_ADDR 0x10
  25
  26 int pcf50606_write(int address, unsigned char val)
  27 {
  28     unsigned char data[] = { address, val };
  29     return i2c_write(PCF50606_ADDR, data, 2);
  30 }
  31
  32 int pcf50606_write_multiple(int address, const unsigned char* buf, int count)
  33 {
  34     int i;
  35
  36     for (i = 0; i < count; i++)
  37         pcf50606_write(address + i, buf[i]);
  38
  39     return 0;
  40 }
  41
  42 int pcf50606_read(int address)
  43 {
  44     unsigned char val = -1;
  45     i2c_readmem(PCF50606_ADDR, address, &val, 1);
  46     return val;
  47 }
  48
  49 int pcf50606_read_multiple(int address, unsigned char* buf, int count)
  50 {
  51     return i2c_readmem(PCF50606_ADDR, address, buf, count);
  52 }
  53
  54 void pcf50606_init(void)
  55 {
  56 #ifdef COWON_D2
  57     /* Set outputs as per OF - further investigation required. */
  58     static const char init_data[] =
  59         {PCF5060X_DCDEC1,  0xe4,
  60          PCF5060X_IOREGC,  0xf5,
  61          PCF5060X_D1REGC1, 0xf5,
  62          PCF5060X_D2REGC1, 0xe9,
  63          PCF5060X_D3REGC1, 0xf8, /* WM8985 3.3v */
  64          PCF5060X_DCUDC1,  0xe7,
  65          PCF5060X_LPREGC1, 0x0,
  66          PCF5060X_LPREGC2, 0x2,
  67          0};
  68
  69     const char* ptr;
  70     for (ptr = init_data; *ptr != 0; ptr += 2)
  71         pcf50606_write(ptr[0], ptr[1]);
  72 #endif
  73 }
  74
  75 void pcf50606_reset_timeout(void)
  76 {
  77     int level = disable_irq_save();
  78     pcf50606_write(PCF5060X_OOCC1, pcf50606_read(PCF5060X_OOCC1) | TOTRST);
  79     restore_irq(level);
  80 }
  81
  82 void pcf50606_read_adc(int adc, short* res1, short* res2)
  83 {
  84     int adcs1 = 0, adcs2 = 0, adcs3 = 0;
  85
  86     int level = disable_irq_save();
  87
  88     pcf50606_write(PCF5060X_ADCC2, (adc<<1) | 1); /* ADC start */
  89
  90     do {
  91         adcs2 = pcf50606_read(PCF5060X_ADCS2);
  92     } while (!(adcs2 & 0x80));        /* Busy wait on ADCRDY flag */
  93
  94     adcs1 = pcf50606_read(PCF5060X_ADCS1);
  95     if (res2 != NULL) adcs3 = pcf50606_read(PCF5060X_ADCS3);
  96
  97     pcf50606_write(PCF5060X_ADCC2, 0);            /* ADC stop */
  98
  99     restore_interrupt(level);
 100
 101     if (res1 != NULL) *res1 = (adcs1 << 2) | (adcs2 & 3);
 102     if (res2 != NULL) *res2 = (adcs3 << 2) | ((adcs2 & 0xC) >> 2);
 103 }