firmware/drivers/audio/wm8975.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Driver for WM8975 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 "logf.h"
  27 #include "system.h"
  28 #include "string.h"
  29 #include "audio.h"
  30
  31 #include "wmcodec.h"
  32 #include "audiohw.h"
  33 #include "i2s.h"
  34
  35 /* use zero crossing to reduce clicks during volume changes */
  36 #define VOLUME_ZC_WAIT (1<<7)
  37
  38 const struct sound_settings_info audiohw_settings[] = {
  39     [SOUND_VOLUME]        = {"dB", 0,  1, -74,   6, -25},
  40     [SOUND_BASS]          = {"dB", 0,  1,  -6,   9,   0},
  41     [SOUND_TREBLE]        = {"dB", 0,  1,  -6,   9,   0},
  42     [SOUND_BALANCE]       = {"%",  0,  1,-100, 100,   0},
  43     [SOUND_CHANNELS]      = {"",   0,  1,   0,   5,   0},
  44     [SOUND_STEREO_WIDTH]  = {"%",  0,  5,   0, 250, 100},
  45     [SOUND_LEFT_GAIN]     = {"dB", 1,  1,-128,  96,   0},
  46     [SOUND_RIGHT_GAIN]    = {"dB", 1,  1,-128,  96,   0},
  47     [SOUND_MIC_GAIN]      = {"dB", 1,  1,-128, 108,  16},
  48 };
  49
  50 /* convert tenth of dB volume (-730..60) to master volume register value */
  51 int tenthdb2master(int db)
  52 {
  53     /* +6 to -73dB 1dB steps (plus mute == 80levels) 7bits */
  54     /* 1111111 == +6dB  (0x7f) */
  55     /* 1111001 == 0dB   (0x79) */
  56     /* 0110000 == -73dB (0x30 */
  57     /* 0101111..0000000 == mute  (0x2f) */
  58
  59     if (db < VOLUME_MIN) {
  60         return 0x0;
  61     } else {
  62         return((db/10)+73+0x30);
  63     }
  64 }
  65
  66 #define IPOD_PCM_LEVEL 0x65       /* -6dB */
  67
  68
  69 /* Silently enable / disable audio output */
  70 void audiohw_enable_output(bool enable)
  71 {
  72     if (enable)
  73     {
  74         /* reset the I2S controller into known state */
  75         i2s_reset();
  76
  77         /*
  78          * 1. Switch on power supplies.
  79          *    By default the WM8750L is in Standby Mode, the DAC is
  80          *    digitally muted and the Audio Interface, Line outputs
  81          *    and Headphone outputs are all OFF (DACMU = 1 Power
  82          *    Management registers 1 and 2 are all zeros).
  83          */
  84         wmcodec_write(RESET, 0x1ff);    /*Reset*/
  85         wmcodec_write(RESET, 0x0);
  86
  87          /* 2. Enable Vmid and VREF. */
  88         wmcodec_write(PWRMGMT1, 0xc0);    /*Pwr Mgmt(1)*/
  89
  90         /* From app notes: allow Vref to stabilize to reduce clicks */
  91         sleep(HZ/4);
  92
  93          /* 3. Enable DACs as required. */
  94         wmcodec_write(PWRMGMT2, 0x180);    /*Pwr Mgmt(2)*/
  95
  96          /* 4. Enable line and / or headphone output buffers as required. */
  97         wmcodec_write(PWRMGMT2, 0x1f8);    /*Pwr Mgmt(2)*/
  98
  99         /* BCLKINV=0(Dont invert BCLK) MS=1(Enable Master) LRSWAP=0 LRP=0 */
 100         /* IWL=00(16 bit) FORMAT=10(I2S format) */
 101         wmcodec_write(AINTFCE, 0x42);
 102
 103         /* The iPod can handle multiple frequencies, but fix at 44.1KHz for now */
 104         audiohw_set_sample_rate(WM8975_44100HZ);
 105
 106         /* set the volume to -6dB */
 107         wmcodec_write(LOUT1VOL, VOLUME_ZC_WAIT | IPOD_PCM_LEVEL);
 108         wmcodec_write(ROUT1VOL, VOLUME_ZC_WAIT | 0x100 | IPOD_PCM_LEVEL);
 109
 110         wmcodec_write(LOUTMIX1, 0x150);    /* Left out Mix(def) */
 111         wmcodec_write(LOUTMIX2, 0x50);
 112
 113         wmcodec_write(ROUTMIX1, 0x50);    /* Right out Mix(def) */
 114         wmcodec_write(ROUTMIX2, 0x150);
 115
 116         wmcodec_write(MOUTMIX1, 0x0);     /* Mono out Mix */
 117         wmcodec_write(MOUTMIX2, 0x0);
 118
 119         audiohw_mute(0);
 120     } else {
 121         audiohw_mute(1);
 122     }
 123 }
 124
 125
 126
 127 void audiohw_set_master_vol(int vol_l, int vol_r)
 128 {
 129     /* +6 to -73dB 1dB steps (plus mute == 80levels) 7bits */
 130     /* 1111111 == +6dB */
 131     /* 1111001 == 0dB */
 132     /* 0110000 == -73dB */
 133     /* 0101111 == mute (0x2f) */
 134
 135     /* OUT1 */
 136     wmcodec_write(LOUT1VOL, VOLUME_ZC_WAIT | vol_l);
 137     wmcodec_write(ROUT1VOL, VOLUME_ZC_WAIT | 0x100 | vol_r);
 138 }
 139
 140 void audiohw_set_lineout_vol(int vol_l, int vol_r)
 141 {
 142     /* OUT2 */
 143     wmcodec_write(LOUT2VOL, VOLUME_ZC_WAIT | vol_l);
 144     wmcodec_write(ROUT2VOL, VOLUME_ZC_WAIT | 0x100 | vol_r);
 145 }
 146
 147 void audiohw_set_bass(int value)
 148 {
 149     const int regvalues[] = {
 150         11, 10, 10, 9, 8, 8, 0xf, 6, 6, 5, 4, 4, 3, 2, 1, 0
 151     };
 152
 153     if ((value >= -6) && (value <= 9)) {
 154         /* We use linear bass control with 200 Hz cutoff */
 155         wmcodec_write(BASSCTRL, regvalues[value + 6] | 0x40);
 156     }
 157 }
 158
 159 void audiohw_set_treble(int value)
 160 {
 161     const int regvalues[] = {
 162         11, 10, 10, 9, 8, 8, 0xf, 6, 6, 5, 4, 4, 3, 2, 1, 0
 163     };
 164
 165     if ((value >= -6) && (value <= 9)) {
 166         /* We use linear treble control with 4 kHz cutoff */
 167         wmcodec_write(TREBCTRL, regvalues[value + 6] | 0x40);
 168     }
 169 }
 170
 171 void audiohw_mute(bool mute)
 172 {
 173     if (mute)
 174     {
 175         /* Set DACMU = 1 to soft-mute the audio DACs. */
 176         wmcodec_write(DACCTRL, 0x8);
 177     } else {
 178         /* Set DACMU = 0 to soft-un-mute the audio DACs. */
 179         wmcodec_write(DACCTRL, 0x0);
 180     }
 181 }
 182
 183 /* Nice shutdown of WM8975 codec */
 184 void audiohw_close(void)
 185 {
 186     /* 1. Set DACMU = 1 to soft-mute the audio DACs. */
 187     wmcodec_write(DACCTRL, 0x8);
 188
 189     /* 2. Disable all output buffers. */
 190     wmcodec_write(PWRMGMT2, 0x0);     /*Pwr Mgmt(2)*/
 191
 192     /* 3. Switch off the power supplies. */
 193     wmcodec_write(PWRMGMT1, 0x0);     /*Pwr Mgmt(1)*/
 194 }
 195
 196 /* Change the order of the noise shaper, 5th order is recommended above 32kHz */
 197 void audiohw_set_nsorder(int order)
 198 {
 199     (void)order;
 200 }
 201
 202 /* Note: Disable output before calling this function */
 203 void audiohw_set_sample_rate(int sampling_control) {
 204
 205   wmcodec_write(0x08, sampling_control);
 206
 207 }
 208
 209 void audiohw_enable_recording(bool source_mic)
 210 {
 211      (void)source_mic;
 212
 213     /* reset the I2S controller into known state */
 214     i2s_reset();
 215
 216     /*
 217      * 1. Switch on power supplies.
 218      *    By default the WM8750L is in Standby Mode, the DAC is
 219      *    digitally muted and the Audio Interface, Line outputs
 220      *    and Headphone outputs are all OFF (DACMU = 1 Power
 221      *    Management registers 1 and 2 are all zeros).
 222      */
 223     wmcodec_write(0x0f, 0x1ff);
 224     wmcodec_write(0x0f, 0x000);
 225
 226      /* 2. Enable Vmid and VREF. */
 227     wmcodec_write(0x19, 0xc0);               /*Pwr Mgmt(1)*/
 228
 229      /* 3. Enable ADCs as required. */
 230     wmcodec_write(0x19, 0xcc);               /*Pwr Mgmt(1)*/
 231     wmcodec_write(0x1a, 0x180);              /*Pwr Mgmt(2)*/
 232
 233      /* 4. Enable line and / or headphone output buffers as required. */
 234     wmcodec_write(0x19, 0xfc);               /*Pwr Mgmt(1)*/
 235
 236     /* BCLKINV=0(Dont invert BCLK) MS=1(Enable Master) LRSWAP=0 LRP=0 */
 237     /* IWL=00(16 bit) FORMAT=10(I2S format) */
 238     wmcodec_write(0x07, 0x42);
 239
 240     /* The iPod can handle multiple frequencies, but fix at 44.1KHz for now */
 241     audiohw_set_sample_rate(WM8975_44100HZ);
 242
 243     /* unmute inputs */
 244     wmcodec_write(0x00, 0x17);               /* LINVOL (def 0dB) */
 245     wmcodec_write(0x01, 0x117);              /* RINVOL (def 0dB) */
 246
 247     wmcodec_write(0x15, 0x1d7);                /* LADCVOL max vol x was ff */
 248     wmcodec_write(0x16, 0x1d7);                /* RADCVOL max vol x was ff */
 249
 250     if (source_mic) {
 251         /* VSEL=10(def) DATSEL=10 (use right ADC only) */
 252         wmcodec_write(0x17, 0xc9);                 /* Additional control(1) */
 253
 254         /* VROI=1 (sets output resistance to 40kohms) */
 255         wmcodec_write(0x1b, 0x40);                 /* Additional control(3) */
 256
 257         /* LINSEL=1 (LINPUT2) LMICBOOST=10 (20dB boost) */
 258         wmcodec_write(0x20, 0x60);               /* ADCL signal path */
 259         wmcodec_write(0x21, 0x60);               /* ADCR signal path */
 260     } else {
 261         /* VSEL=10(def) DATSEL=00 (left->left, right->right) */
 262         wmcodec_write(0x17, 0xc1);                 /* Additional control(1) */
 263
 264         /* VROI=1 (sets output resistance to 40kohms) */
 265         wmcodec_write(0x1b, 0x40);                 /* Additional control(3) */
 266
 267         /* LINSEL=0 (LINPUT1) LMICBOOST=00 (bypass boost) */
 268         wmcodec_write(0x20, 0x00);               /* ADCL signal path */
 269         /* RINSEL=0 (RINPUT1) RMICBOOST=00 (bypass boost) */
 270         wmcodec_write(0x21, 0x00);               /* ADCR signal path */
 271     }
 272 }
 273
 274 void audiohw_disable_recording(void) {
 275     /* 1. Set DACMU = 1 to soft-mute the audio DACs. */
 276     wmcodec_write(0x05, 0x8);
 277
 278     /* 2. Disable all output buffers. */
 279     wmcodec_write(0x1a, 0x0);        /*Pwr Mgmt(2)*/
 280
 281     /* 3. Switch off the power supplies. */
 282     wmcodec_write(0x19, 0x0);        /*Pwr Mgmt(1)*/
 283 }
 284
 285 void audiohw_set_recvol(int left, int right, int type) {
 286
 287     (void)left;
 288     (void)right;
 289     (void)type;
 290 }
 291
 292 void audiohw_set_monitor(bool enable) {
 293
 294     (void)enable;
 295 }