152 lines
5.3 KiB
C
152 lines
5.3 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2021 Aidan MacDonald
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef __AK4376_H__
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#define __AK4376_H__
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#define AUDIOHW_CAPS (FILTER_ROLL_OFF_CAP|POWER_MODE_CAP)
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#define AUDIOHW_HAVE_SHORT2_ROLL_OFF
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#define AK4376_MIN_VOLUME (-890)
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#define AK4376_MAX_VOLUME 150
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AUDIOHW_SETTING(VOLUME, "dB", 1, 5, AK4376_MIN_VOLUME, AK4376_MAX_VOLUME, -200)
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AUDIOHW_SETTING(FILTER_ROLL_OFF, "", 0, 1, 0, 3, 0)
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AUDIOHW_SETTING(POWER_MODE, "", 0, 1, 0, 1, 0)
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/* Register addresses */
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#define AK4376_REG_PWR1 0x00
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#define AK4376_REG_PWR2 0x01
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#define AK4376_REG_PWR3 0x02
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#define AK4376_REG_PWR4 0x03
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#define AK4376_REG_OUTPUT_MODE 0x04
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#define AK4376_REG_CLOCK_MODE 0x05
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#define AK4376_REG_FILTER 0x06
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#define AK4376_REG_MIXER 0x07
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#define AK4376_REG_LCH_VOLUME 0x0b
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#define AK4376_REG_RCH_VOLUME 0x0c
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#define AK4376_REG_AMP_VOLUME 0x0d
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#define AK4376_REG_PLL_CLK_SRC 0x0e
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#define AK4376_REG_PLL_REF_DIV1 0x0f
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#define AK4376_REG_PLL_REF_DIV2 0x10
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#define AK4376_REG_PLL_FB_DIV1 0x11
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#define AK4376_REG_PLL_FB_DIV2 0x12
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#define AK4376_REG_DAC_CLK_SRC 0x13
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#define AK4376_REG_DAC_CLK_DIV 0x14
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#define AK4376_REG_AUDIO_IF_FMT 0x15
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#define AK4376_REG_CHIP_ID 0x21
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#define AK4376_REG_MODE_CTRL 0x24
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#define AK4376_REG_ADJUST1 0x26
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#define AK4376_REG_ADJUST2 0x2a
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#define AK4376_NUM_REGS 0x2b
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/* Mixer controls, simply OR them together.
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* LCH = add LCH signal to output
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* RCH = add RCH signal to output
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* HALF = multiply output by 1/2
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* INVERT = invert the output after everything else
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*/
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#define AK4376_MIX_MUTE 0
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#define AK4376_MIX_LCH 1
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#define AK4376_MIX_RCH 2
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#define AK4376_MIX_HALF 4
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#define AK4376_MIX_INVERT 8
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/* Min/max digital volumes in units of dB/10 */
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#define AK4376_DIG_VOLUME_MIN (-120)
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#define AK4376_DIG_VOLUME_MAX 30
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#define AK4376_DIG_VOLUME_STEP 5
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#define AK4376_DIG_VOLUME_MUTE (AK4376_DIG_VOLUME_MIN - 1)
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/* Min/max headphone amp volumes in units of dB/10 */
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#define AK4376_AMP_VOLUME_MIN (-200)
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#define AK4376_AMP_VOLUME_MAX 60
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#define AK4376_AMP_VOLUME_STEP 20
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#define AK4376_AMP_VOLUME_MUTE (AK4376_AMP_VOLUME_MIN - 1)
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/* Digital filters */
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#define AK4376_FILTER_SHARP 0
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#define AK4376_FILTER_SLOW 1
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#define AK4376_FILTER_SHORT_SHARP 2
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#define AK4376_FILTER_SHORT_SLOW 3
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/* Frequency selection */
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#define AK4376_FS_8 0
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#define AK4376_FS_11 1
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#define AK4376_FS_12 2
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#define AK4376_FS_16 4
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#define AK4376_FS_22 5
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#define AK4376_FS_24 6
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#define AK4376_FS_32 8
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#define AK4376_FS_44 9
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#define AK4376_FS_48 10
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#define AK4376_FS_64 12
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#define AK4376_FS_88 13
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#define AK4376_FS_96 14
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#define AK4376_FS_176 17
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#define AK4376_FS_192 18
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/* Functions to power on / off the DAC which should be called from
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* the target's audiohw_init() / audiohw_close() implementation.
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*/
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extern void ak4376_init(void);
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extern void ak4376_close(void);
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/* Register read/write. Cached to avoid redundant reads/writes. */
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extern void ak4376_write(int reg, int value);
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extern int ak4376_read(int reg);
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/* Target-specific function to set the PDN pin level. */
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extern void ak4376_set_pdn_pin(int level);
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/* Target-specific function to control the external master clock frequency.
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* This is called by the ak4376's audiohw implementation when switching to
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* or from a frequency that is configured to use this clock source.
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*
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* - hw_freq is the new sample rate -- one of the HW_FREQ_XX constants.
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* - enabled is true if clock should be output, false if not.
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*
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* The return value is the master clock rate as a multiple of the sampling
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* frequency. The allowed multiples depend on the sampling frequency, shown
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* in the table below.
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*
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* +-----------+------------------------+
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* | frequency | master clock rate |
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* +-----------+------------------------+
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* | 8 - 24 | 256fs / 512fs / 1024fs |
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* | 32 - 48 | 256fs / 512fs |
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* | 64 - 96 | 256fs |
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* | 128 - 192 | 128fs |
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* +-----------+------------------------+
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*
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* For example, at 48 KHz you could return either 256 or 512 depending on
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* the rate you decided to actually use.
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*
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* You need to return a valid master multiplier for supported frequencies
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* even when enabled = false, since the driver needs to know the multiplier
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* _before_ enabling the clock.
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*
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* For unsupported frequencies you don't need to return a valid master
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* multiplier, because the DAC doesn't need the return value in such cases.
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*/
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extern int ak4376_set_mclk_freq(int hw_freq, bool enabled);
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#endif /* __AK4376_H__ */
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