firmware/drivers/audio/wm8978.c


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/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2008 by Michael Sevakis
 *
 * Driver for WM8978 audio codec 
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
#include "config.h"
#include "system.h"
#include "audiohw.h"
#include "wmcodec.h"
#include "audio.h"
/*#define LOGF_ENABLE*/
#include "logf.h"

/* TODO: Define/refine an API for special hardware steps outside the
 * main codec driver such as special GPIO handling. */
/* NOTE: Much of the volume code is very interdependent and calibrated for
 * the Gigabeat S. If you change anything for another device that uses this
 * file it may break things. */
extern void audiohw_enable_headphone_jack(bool enable);

const struct sound_settings_info audiohw_settings[] =
{
    [SOUND_VOLUME]             = {"dB", 0,   1, -90,   6, -25},
    [SOUND_BALANCE]            = {"%",  0,   1,-100, 100,   0},
    [SOUND_CHANNELS]           = {"",   0,   1,   0,   5,   0},
    [SOUND_STEREO_WIDTH]       = {"%",  0,   5,   0, 250, 100},
    [SOUND_EQ_BAND1_GAIN]      = {"dB", 0,   1, -12,  12,   0},
    [SOUND_EQ_BAND2_GAIN]      = {"dB", 0,   1, -12,  12,   0},
    [SOUND_EQ_BAND3_GAIN]      = {"dB", 0,   1, -12,  12,   0},
    [SOUND_EQ_BAND4_GAIN]      = {"dB", 0,   1, -12,  12,   0},
    [SOUND_EQ_BAND5_GAIN]      = {"dB", 0,   1, -12,  12,   0},
    [SOUND_EQ_BAND1_FREQUENCY] = {"",   0,   1,   0,   3,   0},
    [SOUND_EQ_BAND2_FREQUENCY] = {"",   0,   1,   0,   3,   0},
    [SOUND_EQ_BAND3_FREQUENCY] = {"",   0,   1,   0,   3,   0},
    [SOUND_EQ_BAND4_FREQUENCY] = {"",   0,   1,   0,   3,   0},
    [SOUND_EQ_BAND5_FREQUENCY] = {"",   0,   1,   0,   3,   0},
    [SOUND_EQ_BAND2_WIDTH]     = {"",   0,   1,   0,   1,   0},
    [SOUND_EQ_BAND3_WIDTH]     = {"",   0,   1,   0,   1,   0},
    [SOUND_EQ_BAND4_WIDTH]     = {"",   0,   1,   0,   1,   0},
    [SOUND_DEPTH_3D]           = {"%",  0,   1,   0,  15,   0},
#ifdef HAVE_RECORDING
    /* Digital: -119.0dB to +8.0dB in 0.5dB increments
     * Analog:  Relegated to volume control
     * Circumstances unfortunately do not allow a great deal of positive
     * gain. */
    [SOUND_LEFT_GAIN]          = {"dB", 1,   1,-238,  16,   0},
    [SOUND_RIGHT_GAIN]         = {"dB", 1,   1,-238,  16,   0},
#if 0
    [SOUND_MIC_GAIN]           = {"dB", 1,   1,-238,  16,   0},
#endif
#endif
};

static uint16_t wmc_regs[WMC_NUM_REGISTERS] =
{
    /* Initialized with post-reset default values - the 2-wire interface
     * cannot be read. Or-in additional bits desired for some registers. */
    [0 ... WMC_NUM_REGISTERS-1]   = 0x8000, /* To ID invalids in gaps */
    [WMC_SOFTWARE_RESET]          = 0x000,
    [WMC_POWER_MANAGEMENT1]       = 0x000,
    [WMC_POWER_MANAGEMENT2]       = 0x000,
    [WMC_POWER_MANAGEMENT3]       = 0x000,
    [WMC_AUDIO_INTERFACE]         = 0x050,
    [WMC_COMPANDING_CTRL]         = 0x000,
    [WMC_CLOCK_GEN_CTRL]          = 0x140,
    [WMC_ADDITIONAL_CTRL]         = 0x000,
    [WMC_GPIO]                    = 0x000,
    [WMC_JACK_DETECT_CONTROL1]    = 0x000,
    [WMC_DAC_CONTROL]             = 0x000,
    [WMC_LEFT_DAC_DIGITAL_VOL]    = 0x0ff, /* Latch left first */
    [WMC_RIGHT_DAC_DIGITAL_VOL]   = 0x0ff | WMC_VU,
    [WMC_JACK_DETECT_CONTROL2]    = 0x000,
    [WMC_ADC_CONTROL]             = 0x100,
    [WMC_LEFT_ADC_DIGITAL_VOL]    = 0x0ff, /* Latch left first */
    [WMC_RIGHT_ADC_DIGITAL_VOL]   = 0x0ff | WMC_VU,
    [WMC_EQ1_LOW_SHELF]           = 0x12c,
    [WMC_EQ2_PEAK1]               = 0x02c,
    [WMC_EQ3_PEAK2]               = 0x02c,
    [WMC_EQ4_PEAK3]               = 0x02c,
    [WMC_EQ5_HIGH_SHELF]          = 0x02c,
    [WMC_DAC_LIMITER1]            = 0x032,
    [WMC_DAC_LIMITER2]            = 0x000,
    [WMC_NOTCH_FILTER1]           = 0x000,
    [WMC_NOTCH_FILTER2]           = 0x000,
    [WMC_NOTCH_FILTER3]           = 0x000,
    [WMC_NOTCH_FILTER4]           = 0x000,
    [WMC_ALC_CONTROL1]            = 0x038,
    [WMC_ALC_CONTROL2]            = 0x00b,
    [WMC_ALC_CONTROL3]            = 0x032,
    [WMC_NOISE_GATE]              = 0x000,
    [WMC_PLL_N]                   = 0x008,
    [WMC_PLL_K1]                  = 0x00c,
    [WMC_PLL_K2]                  = 0x093,
    [WMC_PLL_K3]                  = 0x0e9,
    [WMC_3D_CONTROL]              = 0x000,
    [WMC_BEEP_CONTROL]            = 0x000,
    [WMC_INPUT_CTRL]              = 0x033,
    [WMC_LEFT_INP_PGA_GAIN_CTRL]  = 0x010 | WMC_ZC, /* Latch left first */
    [WMC_RIGHT_INP_PGA_GAIN_CTRL] = 0x010 | WMC_VU | WMC_ZC,
    [WMC_LEFT_ADC_BOOST_CTRL]     = 0x100,
    [WMC_RIGHT_ADC_BOOST_CTRL]    = 0x100,
    [WMC_OUTPUT_CTRL]             = 0x002,
    [WMC_LEFT_MIXER_CTRL]         = 0x001,
    [WMC_RIGHT_MIXER_CTRL]        = 0x001,
    [WMC_LOUT1_HP_VOLUME_CTRL]    = 0x039 | WMC_ZC, /* Latch left first */
    [WMC_ROUT1_HP_VOLUME_CTRL]    = 0x039 | WMC_VU | WMC_ZC,
    [WMC_LOUT2_SPK_VOLUME_CTRL]   = 0x039 | WMC_ZC, /* Latch left first */
    [WMC_ROUT2_SPK_VOLUME_CTRL]   = 0x039 | WMC_VU | WMC_ZC,
    [WMC_OUT3_MIXER_CTRL]         = 0x001,
    [WMC_OUT4_MONO_MIXER_CTRL]    = 0x001,
};

struct
{
    signed   char vol_l;
    signed   char vol_r;
    unsigned char dac_l;
    unsigned char dac_r;
    unsigned char ahw_mute;
    unsigned char prescaler;        /* Attenuation */
    unsigned char eq_on;            /* Enabled */
    signed   char band_gain[5];     /* Setting */
    unsigned char enh_3d_prescaler; /* Attenuation */
    unsigned char enh_3d_on;        /* Enabled */
    unsigned char enh_3d;           /* Setting */
} wmc_vol =
{
    .vol_l = 0,
    .vol_r = 0,
    .dac_l = 0,
    .dac_r = 0,
    .ahw_mute = false,
    .prescaler = 0,
    .eq_on = true,
    .band_gain = { 0, 0, 0, 0, 0 },
    .enh_3d_prescaler = 0,
    .enh_3d_on = true,
    .enh_3d   = 0,
};

static void wmc_write(unsigned int reg, unsigned int val)
{
    if (reg >= WMC_NUM_REGISTERS || (wmc_regs[reg] & 0x8000))
    {
        logf("wm8978 invalid register: %d", reg);
        return;
    }

    wmc_regs[reg] = val & ~0x8000;
    wmcodec_write(reg, val);
}

void wmc_set(unsigned int reg, unsigned int bits)
{
    wmc_write(reg, wmc_regs[reg] | bits);
}

void wmc_clear(unsigned int reg, unsigned int bits)
{
    wmc_write(reg, wmc_regs[reg] & ~bits);
}

static void wmc_write_masked(unsigned int reg, unsigned int bits,
                             unsigned int mask)
{
    wmc_write(reg, (wmc_regs[reg] & ~mask) | (bits & mask));
}

/* convert tenth of dB volume (-890..60) to master volume register value
 * (000000...111111) */
int tenthdb2master(int db)
{
    /* -90dB to +6dB 1dB steps (96 levels) 7bits */
    /* 1100000 ==  +6dB  (0x60,96)               */
    /* 1101010 ==   0dB  (0x5a,90)               */
    /* 1000001 == -57dB  (0x21,33,DAC)           */
    /* 0000001 == -89dB  (0x01,01)               */
    /* 0000000 == -90dB  (0x00,00,Mute)          */
    if (db <= VOLUME_MIN)
    {
        return 0x0;
    }
    else
    {
        return (db - VOLUME_MIN) / 10;
    }
}