firmware/drivers/dac.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 by Linus Nielsen Feltzing
  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 "config.h"
  22 #include "stdbool.h"
  23 #include "i2c.h"
  24 #include "debug.h"
  25 #include "dac.h"
  26
  27 #ifdef HAVE_DAC3550A
  28
  29 static bool line_in_enabled = false;
  30 static bool dac_enabled = false;
  31
  32
  33 int dac_volume(unsigned int left, unsigned int right, bool deemph)
  34 {
  35     int ret = 0;
  36     unsigned char buf[3];
  37
  38     i2c_begin();
  39
  40     if (left > 0x38)
  41         left = 0x38;
  42     if (right > 0x38)
  43         right = 0x38;
  44
  45     buf[0] = DAC_REG_WRITE | DAC_AVOL;
  46     buf[1] = (left & 0x3f) | (deemph ? 0x40 : 0);
  47     buf[2] = right & 0x3f;
  48
  49     /* send write command */
  50     if (i2c_write(DAC_DEV_WRITE,buf,3))
  51     {
  52         ret = -1;
  53     }
  54
  55     i2c_end();
  56     return ret;
  57 }
  58
  59 /******************************************************************
  60 ** Bit6:  0 = 3V        1 = 5V
  61 ** Bit5:  0 = normal    1 = low power
  62 ** Bit4:  0 = AUX2 off  1 = AUX2 on
  63 ** Bit3:  0 = AUX1 off  1 = AUX1 on
  64 ** Bit2:  0 = DAC off   1 = DAC on
  65 ** Bit1:  0 = stereo    1 = mono
  66 ** Bit0:  0 = normal right amp   1 = inverted right amp
  67 ******************************************************************/
  68 /* dac_config is called once to initialize it. we will apply
  69    our static settings because of the init flow.
  70    dac_init -> dac_line_in -> mpeg_init -> dac_config
  71 */
  72 static int dac_config(void)
  73 {
  74     int ret = 0;
  75     unsigned char buf[2];
  76
  77     i2c_begin();
  78
  79     buf[0] = DAC_REG_WRITE | DAC_GCFG;
  80     buf[1] = (dac_enabled ? 0x04 : 0) |
  81         (line_in_enabled ? 0x08 : 0);
  82
  83     /* send write command */
  84     if (i2c_write(DAC_DEV_WRITE,buf,2))
  85     {
  86         ret = -1;
  87     }
  88
  89     i2c_end();
  90     return ret;
  91 }
  92
  93 void dac_enable(bool enable)
  94 {
  95     dac_enabled = enable;
  96     dac_config();
  97 }
  98
  99 void dac_line_in(bool enable)
 100 {
 101     line_in_enabled = enable;
 102     dac_config();
 103 }
 104
 105 void dac_init(void)
 106 {
 107     unsigned char buf[2];
 108
 109     i2c_begin();
 110
 111     buf[0] = DAC_REG_WRITE | DAC_SR_REG;
 112     buf[1] = 0x07;
 113
 114     /* send write command */
 115     i2c_write(DAC_DEV_WRITE,buf,2);
 116     i2c_end();
 117 }
 118
 119 #endif