firmware/drivers/audio/wm8721.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Driver for WM8721 audio codec
  11  *
  12  * Based on code from the ipodlinux project - http://ipodlinux.org/
  13  * Adapted for Rockbox in January 2006
  14  *
  15  * Original file: linux/arch/armnommu/mach-ipod/audio.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 "config.h"
  29 #include "logf.h"
  30 #include "system.h"
  31 #include "string.h"
  32 #include "audio.h"
  33
  34 #include "wmcodec.h"
  35 #include "audiohw.h"
  36 #include "i2s.h"
  37
  38 #define IPOD_PCM_LEVEL 0x65       /* -6dB */
  39
  40 /* use zero crossing to reduce clicks during volume changes */
  41 #define VOLUME_ZC_WAIT (1<<7)
  42
  43 const struct sound_settings_info audiohw_settings[] = {
  44     [SOUND_VOLUME]        = {"dB", 0,  1, -74,   6, -25},
  45     /* HAVE_SW_TONE_CONTROLS */
  46     [SOUND_BASS]          = {"dB", 0,  1, -24,  24,   0},
  47     [SOUND_TREBLE]        = {"dB", 0,  1, -24,  24,   0},
  48     [SOUND_BALANCE]       = {"%",  0,  1,-100, 100,   0},
  49     [SOUND_CHANNELS]      = {"",   0,  1,   0,   5,   0},
  50     [SOUND_STEREO_WIDTH]  = {"%",  0,  5,   0, 250, 100},
  51 };
  52
  53 /* convert tenth of dB volume (-730..60) to master volume register value */
  54 int tenthdb2master(int db)
  55 {
  56     /* +6 to -73dB 1dB steps (plus mute == 80levels) 7bits */
  57     /* 1111111 == +6dB  (0x7f) */
  58     /* 1111001 == 0dB   (0x79) */
  59     /* 0110000 == -73dB (0x30 */
  60     /* 0101111 == mute  (0x2f) */
  61
  62     if (db < VOLUME_MIN) {
  63         return 0x2f;
  64     } else {
  65         return((db/10)+0x30+73);
  66     }
  67 }
  68
  69 void audiohw_mute(bool mute)
  70 {
  71     if (mute)
  72     {
  73         /* Set DACMU = 1 to soft-mute the audio DACs. */
  74         wmcodec_write(DAPCTRL, 0x8);
  75     } else {
  76         /* Set DACMU = 0 to soft-un-mute the audio DACs. */
  77         wmcodec_write(DAPCTRL, 0x0);
  78     }
  79 }
  80
  81 /** From ipodLinux **/
  82 static void codec_set_active(int active)
  83 {
  84     /* set active to 0x0 or 0x1 */
  85     if (active) {
  86         wmcodec_write(ACTIVECTRL, 0x01);
  87     } else {
  88         wmcodec_write(ACTIVECTRL, 0x00);
  89     }
  90 }
  91
  92
  93 /* Silently enable / disable audio output */
  94 void audiohw_enable_output(bool enable)
  95 {
  96     if (enable)
  97     {
  98         /* reset the I2S controller into known state */
  99         i2s_reset();
 100
 101         wmcodec_write(RESET, 0x0);        /*Reset*/
 102
 103         codec_set_active(0x0);
 104
 105         /* DACSEL=1 */
 106         wmcodec_write(0x4, 0x10);
 107
 108         /* set power register to POWEROFF=0 on OUTPD=0, DACPD=0 */
 109         wmcodec_write(PDCTRL, 0x67);
 110
 111         /* BCLKINV=0(Dont invert BCLK) MS=1(Enable Master) LRSWAP=0 LRP=0 */
 112         /* IWL=00(16 bit) FORMAT=10(I2S format) */
 113         wmcodec_write(AINTFCE, 0x42);
 114
 115         audiohw_set_sample_rate(WM8721_USB24_44100HZ);
 116
 117         /* set the volume to -6dB */
 118         wmcodec_write(LOUTVOL, IPOD_PCM_LEVEL);
 119         wmcodec_write(ROUTVOL, 0x100 | IPOD_PCM_LEVEL);
 120
 121         /* ACTIVE=1 */
 122         codec_set_active(1);
 123
 124         /* 5. Set DACMU = 0 to soft-un-mute the audio DACs. */
 125         wmcodec_write(DAPCTRL, 0x0);
 126
 127         audiohw_mute(0);
 128     } else {
 129         audiohw_mute(1);
 130     }
 131 }
 132
 133 void audiohw_set_master_vol(int vol_l, int vol_r)
 134 {
 135     /* +6 to -73dB 1dB steps (plus mute == 80levels) 7bits */
 136     /* 1111111 == +6dB */
 137     /* 1111001 == 0dB */
 138     /* 0110000 == -73dB */
 139     /* 0101111 == mute (0x2f) */
 140     wmcodec_write(LOUTVOL, VOLUME_ZC_WAIT | vol_l);
 141     wmcodec_write(ROUTVOL, VOLUME_ZC_WAIT | vol_r);
 142 }
 143
 144 /* Nice shutdown of WM8721 codec */
 145 void audiohw_close(void)
 146 {
 147    /* set DACMU=1 DEEMPH=0 */
 148     wmcodec_write(DAPCTRL, 0x8);
 149
 150     /* ACTIVE=0 */
 151     codec_set_active(0x0);
 152
 153     /* set DACSEL=0, MUTEMIC=1 */
 154     wmcodec_write(0x4, 0x2);
 155
 156     /* set POWEROFF=0 OUTPD=0 DACPD=1 */
 157     wmcodec_write(PDCTRL, 0x6f);
 158
 159     /* set POWEROFF=1 OUTPD=1 DACPD=1 */
 160     wmcodec_write(PDCTRL, 0xff);
 161 }
 162
 163 /* Change the order of the noise shaper, 5th order is recommended above 32kHz */
 164 void audiohw_set_nsorder(int order)
 165 {
 166     (void)order;
 167 }
 168
 169 void audiohw_set_sample_rate(int sampling_control)
 170 {
 171     int rate = 0;
 172     switch(sampling_control)
 173     {
 174         case SAMPR_96:
 175             rate = WM8721_USB24_96000HZ;
 176             break;
 177         case SAMPR_88:
 178             rate = WM8721_USB24_88200HZ;
 179             break;
 180         case SAMPR_48:
 181             rate = WM8721_USB24_48000HZ;
 182             break;
 183         case SAMPR_44:
 184             rate = WM8721_USB24_44100HZ;
 185             break;
 186         case SAMPR_32:
 187             rate = WM8721_USB24_32000HZ;
 188             break;
 189         case SAMPR_8:
 190             rate = WM8721_USB24_8000HZ;
 191             break;
 192     }
 193     codec_set_active(0x0);
 194     wmcodec_write(SAMPCTRL, rate);
 195     codec_set_active(0x1);
 196 }