firmware/drivers/audio/wm8751.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Driver for WM8751 audio codec
  11  *
  12  * Based on code from the ipodlinux project - http://ipodlinux.org/
  13  * Adapted for Rockbox in December 2005
  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 "kernel.h"
  27 #include "wmcodec.h"
  28 #include "i2s.h"
  29 #include "audio.h"
  30 #include "audiohw.h"
  31
  32 const struct sound_settings_info audiohw_settings[] = {
  33     [SOUND_VOLUME]        = {"dB", 0,  1, -74,   6, -25},
  34 #ifdef USE_ADAPTIVE_BASS
  35     [SOUND_BASS]          = {"",   0,  1,   0,  15,   0},
  36 #else
  37     [SOUND_BASS]          = {"dB", 1, 15, -60,  90,   0},
  38 #endif
  39     [SOUND_TREBLE]        = {"dB", 1, 15, -60,  90,   0},
  40     [SOUND_BALANCE]       = {"%",  0,  1,-100, 100,   0},
  41     [SOUND_CHANNELS]      = {"",   0,  1,   0,   5,   0},
  42     [SOUND_STEREO_WIDTH]  = {"%",  0,  5,   0, 250, 100},
  43 };
  44
  45 /* Flags used in combination with settings */
  46
  47 /* use zero crossing to reduce clicks during volume changes */
  48 #define LOUT1_BITS      (LOUT1_LO1ZC)
  49 /* latch left volume first then update left+right together */
  50 #define ROUT1_BITS      (ROUT1_RO1ZC | ROUT1_RO1VU)
  51 #define LOUT2_BITS      (LOUT2_LO2ZC)
  52 #define ROUT2_BITS      (ROUT2_RO2ZC | ROUT2_RO2VU)
  53 /* We use linear bass control with 200 Hz cutoff */
  54 #ifdef USE_ADAPTIVE_BASE
  55 #define BASSCTRL_BITS   (BASSCTRL_BC | BASSCTRL_BB)
  56 #else
  57 #define BASSCTRL_BITS   (BASSCTRL_BC)
  58 #endif
  59 /* We use linear treble control with 4 kHz cutoff */
  60 #define TREBCTRL_BITS   (TREBCTRL_TC)
  61
  62 /* convert tenth of dB volume (-730..60) to master volume register value */
  63 int tenthdb2master(int db)
  64 {
  65     /* +6 to -73dB 1dB steps (plus mute == 80levels) 7bits */
  66     /* 1111111 ==  +6dB  (0x7f)                            */
  67     /* 1111001 ==   0dB  (0x79)                            */
  68     /* 0110000 == -73dB  (0x30)                            */
  69     /* 0101111..0000000 == mute  (<= 0x2f)                 */
  70     if (db < VOLUME_MIN)
  71         return 0x0;
  72     else
  73         return (db / 10) + 73 + 0x30;
  74 }
  75
  76 static int tone_tenthdb2hw(int value)
  77 {
  78     /* -6.0db..+0db..+9.0db step 1.5db - translate -60..+0..+90 step 15
  79         to 10..6..0 step -1.
  80     */
  81     value = 10 - (value + 60) / 15;
  82
  83     if (value == 6)
  84         value = 0xf; /* 0db -> off */
  85
  86     return value;
  87 }
  88
  89
  90 #ifdef USE_ADAPTIVE_BASS
  91 static int adaptivebass2hw(int value)
  92 {
  93     /* 0 to 15 step 1 - step -1  0 = off is a 15 in the register */
  94     value = 15 - value;
  95
  96     return value;
  97 }
  98 #endif
  99
 100 /* Reset and power up the WM8751 */
 101 void audiohw_preinit(void)
 102 {
 103     /*
 104      * 1. Switch on power supplies.
 105      *    By default the WM8751 is in Standby Mode, the DAC is
 106      *    digitally muted and the Audio Interface, Line outputs
 107      *    and Headphone outputs are all OFF (DACMU = 1 Power
 108      *    Management registers 1 and 2 are all zeros).
 109      */
 110     wmcodec_write(RESET, RESET_RESET);    /*Reset*/
 111
 112      /* 2. Enable Vmid and VREF. */
 113     wmcodec_write(PWRMGMT1, PWRMGMT1_VREF | PWRMGMT1_VMIDSEL_5K);
 114
 115     /* BCLKINV=0(Dont invert BCLK) MS=1(Enable Master) LRSWAP=0 LRP=0 */
 116     /* IWL=00(16 bit) FORMAT=10(I2S format) */
 117     wmcodec_write(AINTFCE, AINTFCE_MS | AINTFCE_WL_16 |
 118                   AINTFCE_FORMAT_I2S);
 119 }
 120
 121 /* Enable DACs and audio output after a short delay */
 122 void audiohw_postinit(void)
 123 {
 124     /* From app notes: allow Vref to stabilize to reduce clicks */
 125     sleep(HZ);
 126
 127      /* 3. Enable DACs as required. */
 128     wmcodec_write(PWRMGMT2, PWRMGMT2_DACL | PWRMGMT2_DACR);
 129
 130      /* 4. Enable line and / or headphone output buffers as required. */
 131     wmcodec_write(PWRMGMT2, PWRMGMT2_DACL | PWRMGMT2_DACR |
 132                   PWRMGMT2_LOUT1 | PWRMGMT2_ROUT1 | PWRMGMT2_LOUT2 |
 133                   PWRMGMT2_ROUT2);
 134
 135     wmcodec_write(ADDITIONAL1, ADDITIONAL1_TSDEN | ADDITIONAL1_TOEN |
 136                     ADDITIONAL1_DMONOMIX_LLRR | ADDITIONAL1_VSEL_DEFAULT);
 137
 138     wmcodec_write(LEFTMIX1, LEFTMIX1_LD2LO | LEFTMIX1_LI2LO_DEFAULT);
 139     wmcodec_write(RIGHTMIX2, RIGHTMIX2_RD2RO | RIGHTMIX2_RI2RO_DEFAULT);
 140
 141     audiohw_mute(false);
 142 }
 143
 144 int 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
 152     wmcodec_write(LOUT1, LOUT1_BITS | LOUT1_LOUT1VOL(vol_l));
 153     wmcodec_write(ROUT1, ROUT1_BITS | ROUT1_ROUT1VOL(vol_r));
 154     return 0;
 155 }
 156
 157 int audiohw_set_lineout_vol(int vol_l, int vol_r)
 158 {
 159     wmcodec_write(LOUT2, LOUT2_BITS | LOUT2_LOUT2VOL(vol_l));
 160     wmcodec_write(ROUT2, ROUT2_BITS | ROUT2_ROUT2VOL(vol_r));
 161     return 0;
 162 }
 163
 164 void audiohw_set_bass(int value)
 165 {
 166     wmcodec_write(BASSCTRL, BASSCTRL_BITS |
 167
 168 #ifdef USE_ADAPTIVE_BASS
 169         BASSCTRL_BASS(adaptivebass2hw(value)));
 170 #else
 171         BASSCTRL_BASS(tone_tenthdb2hw(value)));
 172 #endif
 173 }
 174
 175 void audiohw_set_treble(int value)
 176 {
 177     wmcodec_write(TREBCTRL, TREBCTRL_BITS |
 178         TREBCTRL_TREB(tone_tenthdb2hw(value)));
 179 }
 180
 181 void audiohw_mute(bool mute)
 182 {
 183     /* Mute:   Set DACMU = 1 to soft-mute the audio DACs. */
 184     /* Unmute: Set DACMU = 0 to soft-un-mute the audio DACs. */
 185     wmcodec_write(DACCTRL, mute ? DACCTRL_DACMU : 0);
 186 }
 187
 188 /* Nice shutdown of WM8751 codec */
 189 void audiohw_close(void)
 190 {
 191     /* 1. Set DACMU = 1 to soft-mute the audio DACs. */
 192     audiohw_mute(true);
 193
 194     /* 2. Disable all output buffers. */
 195     wmcodec_write(PWRMGMT2, 0x0);
 196
 197     /* 3. Switch off the power supplies. */
 198     wmcodec_write(PWRMGMT1, 0x0);
 199 }
 200
 201 /* Note: Disable output before calling this function */
 202 void audiohw_set_frequency(int fsel)
 203 {
 204     wmcodec_write(CLOCKING, fsel);
 205 }