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  * All files in this archive are subject to the GNU General Public License.
  20  * See the file COPYING in the source tree root for full license agreement.
  21  *
  22  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  23  * KIND, either express or implied.
  24  *
  25  ****************************************************************************/
  26 #include "config.h"
  27 #include "logf.h"
  28 #include "system.h"
  29 #include "string.h"
  30 #include "audio.h"
  31
  32 #include "wmcodec.h"
  33 #include "audiohw.h"
  34 #include "i2s.h"
  35
  36 #define IPOD_PCM_LEVEL 0x65       /* -6dB */
  37
  38 /* use zero crossing to reduce clicks during volume changes */
  39 #define VOLUME_ZC_WAIT (1<<7)
  40
  41 const struct sound_settings_info audiohw_settings[] = {
  42     [SOUND_VOLUME]        = {"dB", 0,  1, -74,   6, -25},
  43     /* HAVE_SW_TONE_CONTROLS */
  44     [SOUND_BASS]          = {"dB", 0,  1, -24,  24,   0},
  45     [SOUND_TREBLE]        = {"dB", 0,  1, -24,  24,   0},
  46     [SOUND_BALANCE]       = {"%",  0,  1,-100, 100,   0},
  47     [SOUND_CHANNELS]      = {"",   0,  1,   0,   5,   0},
  48     [SOUND_STEREO_WIDTH]  = {"%",  0,  5,   0, 250, 100},
  49 };
  50
  51 /* convert tenth of dB volume (-730..60) to master volume register value */
  52 int tenthdb2master(int db)
  53 {
  54     /* +6 to -73dB 1dB steps (plus mute == 80levels) 7bits */
  55     /* 1111111 == +6dB  (0x7f) */
  56     /* 1111001 == 0dB   (0x79) */
  57     /* 0110000 == -73dB (0x30 */
  58     /* 0101111 == mute  (0x2f) */
  59
  60     if (db < VOLUME_MIN) {
  61         return 0x2f;
  62     } else {
  63         return((db/10)+0x30+73);
  64     }
  65 }
  66
  67 /* convert tenth of dB volume (-780..0) to mixer volume register value */
  68 int tenthdb2mixer(int db)
  69 {
  70     if (db < -660)                 /* 1.5 dB steps */
  71         return (2640 - db) / 15;
  72     else if (db < -600)            /* 0.75 dB steps */
  73         return (990 - db) * 2 / 15;
  74     else if (db < -460)            /* 0.5 dB steps */
  75         return (460 - db) / 5;
  76     else                           /* 0.25 dB steps */
  77         return -db * 2 / 5;
  78 }
  79
  80 void audiohw_mute(bool mute)
  81 {
  82     if (mute)
  83     {
  84         /* Set DACMU = 1 to soft-mute the audio DACs. */
  85         wmcodec_write(DAPCTRL, 0x8);
  86     } else {
  87         /* Set DACMU = 0 to soft-un-mute the audio DACs. */
  88         wmcodec_write(DAPCTRL, 0x0);
  89     }
  90 }
  91
  92 /** From ipodLinux **/
  93 static void codec_set_active(int active)
  94 {
  95     /* set active to 0x0 or 0x1 */
  96     if (active) {
  97         wmcodec_write(ACTIVECTRL, 0x01);
  98     } else {
  99         wmcodec_write(ACTIVECTRL, 0x00);
 100     }
 101 }
 102
 103
 104 /* Silently enable / disable audio output */
 105 void audiohw_enable_output(bool enable)
 106 {
 107     if (enable)
 108     {
 109         /* reset the I2S controller into known state */
 110         i2s_reset();
 111
 112         wmcodec_write(RESET, 0x0);        /*Reset*/
 113
 114         codec_set_active(0x0);
 115
 116         /* DACSEL=1 */
 117         wmcodec_write(0x4, 0x10);
 118
 119         /* set power register to POWEROFF=0 on OUTPD=0, DACPD=0 */
 120         wmcodec_write(PDCTRL, 0x67);
 121
 122         /* BCLKINV=0(Dont invert BCLK) MS=1(Enable Master) LRSWAP=0 LRP=0 */
 123         /* IWL=00(16 bit) FORMAT=10(I2S format) */
 124         wmcodec_write(AINTFCE, 0x42);
 125
 126         audiohw_set_sample_rate(WM8721_USB24_44100HZ);
 127
 128         /* set the volume to -6dB */
 129         wmcodec_write(LOUTVOL, IPOD_PCM_LEVEL);
 130         wmcodec_write(ROUTVOL, 0x100 | IPOD_PCM_LEVEL);
 131
 132         /* ACTIVE=1 */
 133         codec_set_active(1);
 134
 135         /* 5. Set DACMU = 0 to soft-un-mute the audio DACs. */
 136         wmcodec_write(DAPCTRL, 0x0);
 137
 138         audiohw_mute(0);
 139     } else {
 140         audiohw_mute(1);
 141     }
 142 }
 143
 144 void audiohw_set_master_vol(int vol_l, int vol_r)
 145 {
 146     /* +6 to -73dB 1dB steps (plus mute == 80levels) 7bits */
 147     /* 1111111 == +6dB */
 148     /* 1111001 == 0dB */
 149     /* 0110000 == -73dB */
 150     /* 0101111 == mute (0x2f) */
 151     wmcodec_write(LOUTVOL, VOLUME_ZC_WAIT | vol_l);
 152     wmcodec_write(ROUTVOL, VOLUME_ZC_WAIT | vol_r);
 153 }
 154
 155 /* Nice shutdown of WM8721 codec */
 156 void audiohw_close(void)
 157 {
 158    /* set DACMU=1 DEEMPH=0 */
 159     wmcodec_write(DAPCTRL, 0x8);
 160
 161     /* ACTIVE=0 */
 162     codec_set_active(0x0);
 163
 164     /* set DACSEL=0, MUTEMIC=1 */
 165     wmcodec_write(0x4, 0x2);
 166
 167     /* set POWEROFF=0 OUTPD=0 DACPD=1 */
 168     wmcodec_write(PDCTRL, 0x6f);
 169
 170     /* set POWEROFF=1 OUTPD=1 DACPD=1 */
 171     wmcodec_write(PDCTRL, 0xff);
 172 }
 173
 174 /* Change the order of the noise shaper, 5th order is recommended above 32kHz */
 175 void audiohw_set_nsorder(int order)
 176 {
 177     (void)order;
 178 }
 179
 180 void audiohw_set_sample_rate(int sampling_control)
 181 {
 182     codec_set_active(0x0);
 183     wmcodec_write(SAMPCTRL, sampling_control);
 184     codec_set_active(0x1);
 185 }