firmware/drivers/audio/tsc2100.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Driver for TSC2100 audio codec
  11  *
  12  * Copyright (c) 2008 Jonathan Gordon
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License
  16  * as published by the Free Software Foundation; either version 2
  17  * of the License, or (at your option) any later version.
  18  *
  19  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  20  * KIND, either express or implied.
  21  *
  22  ****************************************************************************/
  23 #include "cpu.h"
  24 #include "debug.h"
  25 #include "system.h"
  26 #include "audio.h"
  27
  28 #include "audiohw.h"
  29 #include "tsc2100.h"
  30
  31 const struct sound_settings_info audiohw_settings[] = {
  32     [SOUND_VOLUME]        = {"dB",   0,   1, VOLUME_MIN/10, VOLUME_MAX/10, -25},
  33     /* HAVE_SW_TONE_CONTROLS */
  34     [SOUND_BASS]          = {"dB",   0,   1, -24,  24,   0},
  35     [SOUND_TREBLE]        = {"dB",   0,   1, -24,  24,   0},
  36     [SOUND_BALANCE]       = {"%",    0,   1,-100, 100,   0},
  37     [SOUND_CHANNELS]      = {"",     0,   1,   0,   5,   0},
  38     [SOUND_STEREO_WIDTH]  = {"%",    0,   5,   0, 250, 100},
  39 };
  40 static bool is_muted = false;
  41 /* convert tenth of dB volume to master volume register value */
  42 int tenthdb2master(int db)
  43 {
  44     /* 0 to -63.0dB in 1dB steps, tsc2100 can goto -63.5 in 0.5dB steps */
  45     if (db < VOLUME_MIN) {
  46         return 0x7E;
  47     } else if (db >= VOLUME_MAX) {
  48         return 0x00;
  49     } else {
  50         return(-((db)/5)); /* VOLUME_MIN is negative */
  51     }
  52 }
  53
  54 int sound_val2phys(int setting, int value)
  55 {
  56     int result;
  57
  58     switch(setting)
  59     {
  60 #if 0
  61     case SOUND_LEFT_GAIN:
  62     case SOUND_RIGHT_GAIN:
  63     case SOUND_MIC_GAIN:
  64         result = (value - 23) * 15;
  65         break;
  66 #endif
  67     default:
  68         result = value;
  69         break;
  70     }
  71
  72     return result;
  73 }
  74
  75 void audiohw_init(void)
  76 {
  77     short val = tsc2100_readreg(TSAC4_PAGE, TSAC4_ADDRESS);
  78     /* disable DAC PGA soft-stepping */
  79     val |= TSAC4_DASTDP;
  80
  81     tsc2100_writereg(TSAC4_PAGE, TSAC4_ADDRESS, val);
  82 }
  83
  84 void audiohw_postinit(void)
  85 {
  86     audiohw_mute(false);
  87 }
  88
  89 void audiohw_set_master_vol(int vol_l, int vol_r)
  90 {
  91    tsc2100_writereg(TSDACGAIN_PAGE, TSDACGAIN_ADDRESS, (short)((vol_l<<8) | vol_r) );
  92 }
  93
  94 void audiohw_mute(bool mute)
  95 {
  96     short vol = tsc2100_readreg(TSDACGAIN_PAGE, TSDACGAIN_ADDRESS);
  97     /* left  mute bit == 1<<15
  98        right mute bit == 1<<7
  99      */
 100     if (mute)
 101     {
 102         vol |= (1<<15)|(1<<7);
 103     } else
 104     {
 105         vol &= ~((1<<15)|(1<<7));
 106     }
 107     is_muted = mute;
 108     tsc2100_writereg(TSDACGAIN_PAGE, TSDACGAIN_ADDRESS, vol);
 109 }
 110
 111 void audiohw_close(void)
 112 {
 113     /* mute headphones */
 114     audiohw_mute(true);
 115 }
 116
 117 void audiohw_set_frequency(int fsel)
 118 {
 119     (void)fsel;
 120 }