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linux/sound/soc/codecs/wm8978.c
Lars-Peter Clausen d02486fd42 ASoC: wm8978: Cleanup manual bias level transitions 
Since the ASoC core now takes care of setting the bias level to
SND_SOC_BIAS_OFF when removing the CODEC there is no need to do it manually
anymore either.

The manual transition to SND_SOC_BIAS_STANDBY at the end of CODEC probe()
can also be removed as the core will automatically do this after the CODEC
has been probed.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2014-11-24 18:36:11 +00:00

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/*
* wm8978.c -- WM8978 ALSA SoC Audio Codec driver
*
* Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
* Copyright (C) 2007 Carlos Munoz <carlos@kenati.com>
* Copyright 2006-2009 Wolfson Microelectronics PLC.
* Based on wm8974 and wm8990 by Liam Girdwood <lrg@slimlogic.co.uk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>
#include <sound/tlv.h>
#include <asm/div64.h>
#include "wm8978.h"
static const struct reg_default wm8978_reg_defaults[] = {
{ 1, 0x0000 },
{ 2, 0x0000 },
{ 3, 0x0000 },
{ 4, 0x0050 },
{ 5, 0x0000 },
{ 6, 0x0140 },
{ 7, 0x0000 },
{ 8, 0x0000 },
{ 9, 0x0000 },
{ 10, 0x0000 },
{ 11, 0x00ff },
{ 12, 0x00ff },
{ 13, 0x0000 },
{ 14, 0x0100 },
{ 15, 0x00ff },
{ 16, 0x00ff },
{ 17, 0x0000 },
{ 18, 0x012c },
{ 19, 0x002c },
{ 20, 0x002c },
{ 21, 0x002c },
{ 22, 0x002c },
{ 23, 0x0000 },
{ 24, 0x0032 },
{ 25, 0x0000 },
{ 26, 0x0000 },
{ 27, 0x0000 },
{ 28, 0x0000 },
{ 29, 0x0000 },
{ 30, 0x0000 },
{ 31, 0x0000 },
{ 32, 0x0038 },
{ 33, 0x000b },
{ 34, 0x0032 },
{ 35, 0x0000 },
{ 36, 0x0008 },
{ 37, 0x000c },
{ 38, 0x0093 },
{ 39, 0x00e9 },
{ 40, 0x0000 },
{ 41, 0x0000 },
{ 42, 0x0000 },
{ 43, 0x0000 },
{ 44, 0x0033 },
{ 45, 0x0010 },
{ 46, 0x0010 },
{ 47, 0x0100 },
{ 48, 0x0100 },
{ 49, 0x0002 },
{ 50, 0x0001 },
{ 51, 0x0001 },
{ 52, 0x0039 },
{ 53, 0x0039 },
{ 54, 0x0039 },
{ 55, 0x0039 },
{ 56, 0x0001 },
{ 57, 0x0001 },
};
static bool wm8978_volatile(struct device *dev, unsigned int reg)
{
return reg == WM8978_RESET;
}
/* codec private data */
struct wm8978_priv {
struct regmap *regmap;
unsigned int f_pllout;
unsigned int f_mclk;
unsigned int f_256fs;
unsigned int f_opclk;
int mclk_idx;
enum wm8978_sysclk_src sysclk;
};
static const char *wm8978_companding[] = {"Off", "NC", "u-law", "A-law"};
static const char *wm8978_eqmode[] = {"Capture", "Playback"};
static const char *wm8978_bw[] = {"Narrow", "Wide"};
static const char *wm8978_eq1[] = {"80Hz", "105Hz", "135Hz", "175Hz"};
static const char *wm8978_eq2[] = {"230Hz", "300Hz", "385Hz", "500Hz"};
static const char *wm8978_eq3[] = {"650Hz", "850Hz", "1.1kHz", "1.4kHz"};
static const char *wm8978_eq4[] = {"1.8kHz", "2.4kHz", "3.2kHz", "4.1kHz"};
static const char *wm8978_eq5[] = {"5.3kHz", "6.9kHz", "9kHz", "11.7kHz"};
static const char *wm8978_alc3[] = {"ALC", "Limiter"};
static const char *wm8978_alc1[] = {"Off", "Right", "Left", "Both"};
static SOC_ENUM_SINGLE_DECL(adc_compand, WM8978_COMPANDING_CONTROL, 1,
wm8978_companding);
static SOC_ENUM_SINGLE_DECL(dac_compand, WM8978_COMPANDING_CONTROL, 3,
wm8978_companding);
static SOC_ENUM_SINGLE_DECL(eqmode, WM8978_EQ1, 8, wm8978_eqmode);
static SOC_ENUM_SINGLE_DECL(eq1, WM8978_EQ1, 5, wm8978_eq1);
static SOC_ENUM_SINGLE_DECL(eq2bw, WM8978_EQ2, 8, wm8978_bw);
static SOC_ENUM_SINGLE_DECL(eq2, WM8978_EQ2, 5, wm8978_eq2);
static SOC_ENUM_SINGLE_DECL(eq3bw, WM8978_EQ3, 8, wm8978_bw);
static SOC_ENUM_SINGLE_DECL(eq3, WM8978_EQ3, 5, wm8978_eq3);
static SOC_ENUM_SINGLE_DECL(eq4bw, WM8978_EQ4, 8, wm8978_bw);
static SOC_ENUM_SINGLE_DECL(eq4, WM8978_EQ4, 5, wm8978_eq4);
static SOC_ENUM_SINGLE_DECL(eq5, WM8978_EQ5, 5, wm8978_eq5);
static SOC_ENUM_SINGLE_DECL(alc3, WM8978_ALC_CONTROL_3, 8, wm8978_alc3);
static SOC_ENUM_SINGLE_DECL(alc1, WM8978_ALC_CONTROL_1, 7, wm8978_alc1);
static const DECLARE_TLV_DB_SCALE(digital_tlv, -12750, 50, 1);
static const DECLARE_TLV_DB_SCALE(eq_tlv, -1200, 100, 0);
static const DECLARE_TLV_DB_SCALE(inpga_tlv, -1200, 75, 0);
static const DECLARE_TLV_DB_SCALE(spk_tlv, -5700, 100, 0);
static const DECLARE_TLV_DB_SCALE(boost_tlv, -1500, 300, 1);
static const DECLARE_TLV_DB_SCALE(limiter_tlv, 0, 100, 0);
static const struct snd_kcontrol_new wm8978_snd_controls[] = {
SOC_SINGLE("Digital Loopback Switch",
WM8978_COMPANDING_CONTROL, 0, 1, 0),
SOC_ENUM("ADC Companding", adc_compand),
SOC_ENUM("DAC Companding", dac_compand),
SOC_DOUBLE("DAC Inversion Switch", WM8978_DAC_CONTROL, 0, 1, 1, 0),
SOC_DOUBLE_R_TLV("PCM Volume",
WM8978_LEFT_DAC_DIGITAL_VOLUME, WM8978_RIGHT_DAC_DIGITAL_VOLUME,
0, 255, 0, digital_tlv),
SOC_SINGLE("High Pass Filter Switch", WM8978_ADC_CONTROL, 8, 1, 0),
SOC_SINGLE("High Pass Cut Off", WM8978_ADC_CONTROL, 4, 7, 0),
SOC_DOUBLE("ADC Inversion Switch", WM8978_ADC_CONTROL, 0, 1, 1, 0),
SOC_DOUBLE_R_TLV("ADC Volume",
WM8978_LEFT_ADC_DIGITAL_VOLUME, WM8978_RIGHT_ADC_DIGITAL_VOLUME,
0, 255, 0, digital_tlv),
SOC_ENUM("Equaliser Function", eqmode),
SOC_ENUM("EQ1 Cut Off", eq1),
SOC_SINGLE_TLV("EQ1 Volume", WM8978_EQ1, 0, 24, 1, eq_tlv),
SOC_ENUM("Equaliser EQ2 Bandwidth", eq2bw),
SOC_ENUM("EQ2 Cut Off", eq2),
SOC_SINGLE_TLV("EQ2 Volume", WM8978_EQ2, 0, 24, 1, eq_tlv),
SOC_ENUM("Equaliser EQ3 Bandwidth", eq3bw),
SOC_ENUM("EQ3 Cut Off", eq3),
SOC_SINGLE_TLV("EQ3 Volume", WM8978_EQ3, 0, 24, 1, eq_tlv),
SOC_ENUM("Equaliser EQ4 Bandwidth", eq4bw),
SOC_ENUM("EQ4 Cut Off", eq4),
SOC_SINGLE_TLV("EQ4 Volume", WM8978_EQ4, 0, 24, 1, eq_tlv),
SOC_ENUM("EQ5 Cut Off", eq5),
SOC_SINGLE_TLV("EQ5 Volume", WM8978_EQ5, 0, 24, 1, eq_tlv),
SOC_SINGLE("DAC Playback Limiter Switch",
WM8978_DAC_LIMITER_1, 8, 1, 0),
SOC_SINGLE("DAC Playback Limiter Decay",
WM8978_DAC_LIMITER_1, 4, 15, 0),
SOC_SINGLE("DAC Playback Limiter Attack",
WM8978_DAC_LIMITER_1, 0, 15, 0),
SOC_SINGLE("DAC Playback Limiter Threshold",
WM8978_DAC_LIMITER_2, 4, 7, 0),
SOC_SINGLE_TLV("DAC Playback Limiter Volume",
WM8978_DAC_LIMITER_2, 0, 12, 0, limiter_tlv),
SOC_ENUM("ALC Enable Switch", alc1),
SOC_SINGLE("ALC Capture Min Gain", WM8978_ALC_CONTROL_1, 0, 7, 0),
SOC_SINGLE("ALC Capture Max Gain", WM8978_ALC_CONTROL_1, 3, 7, 0),
SOC_SINGLE("ALC Capture Hold", WM8978_ALC_CONTROL_2, 4, 10, 0),
SOC_SINGLE("ALC Capture Target", WM8978_ALC_CONTROL_2, 0, 15, 0),
SOC_ENUM("ALC Capture Mode", alc3),
SOC_SINGLE("ALC Capture Decay", WM8978_ALC_CONTROL_3, 4, 10, 0),
SOC_SINGLE("ALC Capture Attack", WM8978_ALC_CONTROL_3, 0, 10, 0),
SOC_SINGLE("ALC Capture Noise Gate Switch", WM8978_NOISE_GATE, 3, 1, 0),
SOC_SINGLE("ALC Capture Noise Gate Threshold",
WM8978_NOISE_GATE, 0, 7, 0),
SOC_DOUBLE_R("Capture PGA ZC Switch",
WM8978_LEFT_INP_PGA_CONTROL, WM8978_RIGHT_INP_PGA_CONTROL,
7, 1, 0),
/* OUT1 - Headphones */
SOC_DOUBLE_R("Headphone Playback ZC Switch",
WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL, 7, 1, 0),
SOC_DOUBLE_R_TLV("Headphone Playback Volume",
WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL,
0, 63, 0, spk_tlv),
/* OUT2 - Speakers */
SOC_DOUBLE_R("Speaker Playback ZC Switch",
WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL, 7, 1, 0),
SOC_DOUBLE_R_TLV("Speaker Playback Volume",
WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL,
0, 63, 0, spk_tlv),
/* OUT3/4 - Line Output */
SOC_DOUBLE_R("Line Playback Switch",
WM8978_OUT3_MIXER_CONTROL, WM8978_OUT4_MIXER_CONTROL, 6, 1, 1),
/* Mixer #3: Boost (Input) mixer */
SOC_DOUBLE_R("PGA Boost (+20dB)",
WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL,
8, 1, 0),
SOC_DOUBLE_R_TLV("L2/R2 Boost Volume",
WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL,
4, 7, 0, boost_tlv),
SOC_DOUBLE_R_TLV("Aux Boost Volume",
WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL,
0, 7, 0, boost_tlv),
/* Input PGA volume */
SOC_DOUBLE_R_TLV("Input PGA Volume",
WM8978_LEFT_INP_PGA_CONTROL, WM8978_RIGHT_INP_PGA_CONTROL,
0, 63, 0, inpga_tlv),
/* Headphone */
SOC_DOUBLE_R("Headphone Switch",
WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL, 6, 1, 1),
/* Speaker */
SOC_DOUBLE_R("Speaker Switch",
WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL, 6, 1, 1),
/* DAC / ADC oversampling */
SOC_SINGLE("DAC 128x Oversampling Switch", WM8978_DAC_CONTROL,
5, 1, 0),
SOC_SINGLE("ADC 128x Oversampling Switch", WM8978_ADC_CONTROL,
5, 1, 0),
};
/* Mixer #1: Output (OUT1, OUT2) Mixer: mix AUX, Input mixer output and DAC */
static const struct snd_kcontrol_new wm8978_left_out_mixer[] = {
SOC_DAPM_SINGLE("Line Bypass Switch", WM8978_LEFT_MIXER_CONTROL, 1, 1, 0),
SOC_DAPM_SINGLE("Aux Playback Switch", WM8978_LEFT_MIXER_CONTROL, 5, 1, 0),
SOC_DAPM_SINGLE("PCM Playback Switch", WM8978_LEFT_MIXER_CONTROL, 0, 1, 0),
};
static const struct snd_kcontrol_new wm8978_right_out_mixer[] = {
SOC_DAPM_SINGLE("Line Bypass Switch", WM8978_RIGHT_MIXER_CONTROL, 1, 1, 0),
SOC_DAPM_SINGLE("Aux Playback Switch", WM8978_RIGHT_MIXER_CONTROL, 5, 1, 0),
SOC_DAPM_SINGLE("PCM Playback Switch", WM8978_RIGHT_MIXER_CONTROL, 0, 1, 0),
};
/* OUT3/OUT4 Mixer not implemented */
/* Mixer #2: Input PGA Mute */
static const struct snd_kcontrol_new wm8978_left_input_mixer[] = {
SOC_DAPM_SINGLE("L2 Switch", WM8978_INPUT_CONTROL, 2, 1, 0),
SOC_DAPM_SINGLE("MicN Switch", WM8978_INPUT_CONTROL, 1, 1, 0),
SOC_DAPM_SINGLE("MicP Switch", WM8978_INPUT_CONTROL, 0, 1, 0),
};
static const struct snd_kcontrol_new wm8978_right_input_mixer[] = {
SOC_DAPM_SINGLE("R2 Switch", WM8978_INPUT_CONTROL, 6, 1, 0),
SOC_DAPM_SINGLE("MicN Switch", WM8978_INPUT_CONTROL, 5, 1, 0),
SOC_DAPM_SINGLE("MicP Switch", WM8978_INPUT_CONTROL, 4, 1, 0),
};
static const struct snd_soc_dapm_widget wm8978_dapm_widgets[] = {
SND_SOC_DAPM_DAC("Left DAC", "Left HiFi Playback",
WM8978_POWER_MANAGEMENT_3, 0, 0),
SND_SOC_DAPM_DAC("Right DAC", "Right HiFi Playback",
WM8978_POWER_MANAGEMENT_3, 1, 0),
SND_SOC_DAPM_ADC("Left ADC", "Left HiFi Capture",
WM8978_POWER_MANAGEMENT_2, 0, 0),
SND_SOC_DAPM_ADC("Right ADC", "Right HiFi Capture",
WM8978_POWER_MANAGEMENT_2, 1, 0),
/* Mixer #1: OUT1,2 */
SOC_MIXER_ARRAY("Left Output Mixer", WM8978_POWER_MANAGEMENT_3,
2, 0, wm8978_left_out_mixer),
SOC_MIXER_ARRAY("Right Output Mixer", WM8978_POWER_MANAGEMENT_3,
3, 0, wm8978_right_out_mixer),
SOC_MIXER_ARRAY("Left Input Mixer", WM8978_POWER_MANAGEMENT_2,
2, 0, wm8978_left_input_mixer),
SOC_MIXER_ARRAY("Right Input Mixer", WM8978_POWER_MANAGEMENT_2,
3, 0, wm8978_right_input_mixer),
SND_SOC_DAPM_PGA("Left Boost Mixer", WM8978_POWER_MANAGEMENT_2,
4, 0, NULL, 0),
SND_SOC_DAPM_PGA("Right Boost Mixer", WM8978_POWER_MANAGEMENT_2,
5, 0, NULL, 0),
SND_SOC_DAPM_PGA("Left Capture PGA", WM8978_LEFT_INP_PGA_CONTROL,
6, 1, NULL, 0),
SND_SOC_DAPM_PGA("Right Capture PGA", WM8978_RIGHT_INP_PGA_CONTROL,
6, 1, NULL, 0),
SND_SOC_DAPM_PGA("Left Headphone Out", WM8978_POWER_MANAGEMENT_2,
7, 0, NULL, 0),
SND_SOC_DAPM_PGA("Right Headphone Out", WM8978_POWER_MANAGEMENT_2,
8, 0, NULL, 0),
SND_SOC_DAPM_PGA("Left Speaker Out", WM8978_POWER_MANAGEMENT_3,
6, 0, NULL, 0),
SND_SOC_DAPM_PGA("Right Speaker Out", WM8978_POWER_MANAGEMENT_3,
5, 0, NULL, 0),
SND_SOC_DAPM_MIXER("OUT4 VMID", WM8978_POWER_MANAGEMENT_3,
8, 0, NULL, 0),
SND_SOC_DAPM_MICBIAS("Mic Bias", WM8978_POWER_MANAGEMENT_1, 4, 0),
SND_SOC_DAPM_INPUT("LMICN"),
SND_SOC_DAPM_INPUT("LMICP"),
SND_SOC_DAPM_INPUT("RMICN"),
SND_SOC_DAPM_INPUT("RMICP"),
SND_SOC_DAPM_INPUT("LAUX"),
SND_SOC_DAPM_INPUT("RAUX"),
SND_SOC_DAPM_INPUT("L2"),
SND_SOC_DAPM_INPUT("R2"),
SND_SOC_DAPM_OUTPUT("LHP"),
SND_SOC_DAPM_OUTPUT("RHP"),
SND_SOC_DAPM_OUTPUT("LSPK"),
SND_SOC_DAPM_OUTPUT("RSPK"),
};
static const struct snd_soc_dapm_route wm8978_dapm_routes[] = {
/* Output mixer */
{"Right Output Mixer", "PCM Playback Switch", "Right DAC"},
{"Right Output Mixer", "Aux Playback Switch", "RAUX"},
{"Right Output Mixer", "Line Bypass Switch", "Right Boost Mixer"},
{"Left Output Mixer", "PCM Playback Switch", "Left DAC"},
{"Left Output Mixer", "Aux Playback Switch", "LAUX"},
{"Left Output Mixer", "Line Bypass Switch", "Left Boost Mixer"},
/* Outputs */
{"Right Headphone Out", NULL, "Right Output Mixer"},
{"RHP", NULL, "Right Headphone Out"},
{"Left Headphone Out", NULL, "Left Output Mixer"},
{"LHP", NULL, "Left Headphone Out"},
{"Right Speaker Out", NULL, "Right Output Mixer"},
{"RSPK", NULL, "Right Speaker Out"},
{"Left Speaker Out", NULL, "Left Output Mixer"},
{"LSPK", NULL, "Left Speaker Out"},
/* Boost Mixer */
{"Right ADC", NULL, "Right Boost Mixer"},
{"Right Boost Mixer", NULL, "RAUX"},
{"Right Boost Mixer", NULL, "Right Capture PGA"},
{"Right Boost Mixer", NULL, "R2"},
{"Left ADC", NULL, "Left Boost Mixer"},
{"Left Boost Mixer", NULL, "LAUX"},
{"Left Boost Mixer", NULL, "Left Capture PGA"},
{"Left Boost Mixer", NULL, "L2"},
/* Input PGA */
{"Right Capture PGA", NULL, "Right Input Mixer"},
{"Left Capture PGA", NULL, "Left Input Mixer"},
{"Right Input Mixer", "R2 Switch", "R2"},
{"Right Input Mixer", "MicN Switch", "RMICN"},
{"Right Input Mixer", "MicP Switch", "RMICP"},
{"Left Input Mixer", "L2 Switch", "L2"},
{"Left Input Mixer", "MicN Switch", "LMICN"},
{"Left Input Mixer", "MicP Switch", "LMICP"},
};
/* PLL divisors */
struct wm8978_pll_div {
u32 k;
u8 n;
u8 div2;
};
#define FIXED_PLL_SIZE (1 << 24)
static void pll_factors(struct snd_soc_codec *codec,
struct wm8978_pll_div *pll_div, unsigned int target, unsigned int source)
{
u64 k_part;
unsigned int k, n_div, n_mod;
n_div = target / source;
if (n_div < 6) {
source >>= 1;
pll_div->div2 = 1;
n_div = target / source;
} else {
pll_div->div2 = 0;
}
if (n_div < 6 || n_div > 12)
dev_warn(codec->dev,
"WM8978 N value exceeds recommended range! N = %u\n",
n_div);
pll_div->n = n_div;
n_mod = target - source * n_div;
k_part = FIXED_PLL_SIZE * (long long)n_mod + source / 2;
do_div(k_part, source);
k = k_part & 0xFFFFFFFF;
pll_div->k = k;
}
/* MCLK dividers */
static const int mclk_numerator[] = {1, 3, 2, 3, 4, 6, 8, 12};
static const int mclk_denominator[] = {1, 2, 1, 1, 1, 1, 1, 1};
/*
* find index >= idx, such that, for a given f_out,
* 3 * f_mclk / 4 <= f_PLLOUT < 13 * f_mclk / 4
* f_out can be f_256fs or f_opclk, currently only used for f_256fs. Can be
* generalised for f_opclk with suitable coefficient arrays, but currently
* the OPCLK divisor is calculated directly, not iteratively.
*/
static int wm8978_enum_mclk(unsigned int f_out, unsigned int f_mclk,
unsigned int *f_pllout)
{
int i;
for (i = 0; i < ARRAY_SIZE(mclk_numerator); i++) {
unsigned int f_pllout_x4 = 4 * f_out * mclk_numerator[i] /
mclk_denominator[i];
if (3 * f_mclk <= f_pllout_x4 && f_pllout_x4 < 13 * f_mclk) {
*f_pllout = f_pllout_x4 / 4;
return i;
}
}
return -EINVAL;
}
/*
* Calculate internal frequencies and dividers, according to Figure 40
* "PLL and Clock Select Circuit" in WM8978 datasheet Rev. 2.6
*/
static int wm8978_configure_pll(struct snd_soc_codec *codec)
{
struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
struct wm8978_pll_div pll_div;
unsigned int f_opclk = wm8978->f_opclk, f_mclk = wm8978->f_mclk,
f_256fs = wm8978->f_256fs;
unsigned int f2;
if (!f_mclk)
return -EINVAL;
if (f_opclk) {
unsigned int opclk_div;
/* Cannot set up MCLK divider now, do later */
wm8978->mclk_idx = -1;
/*
* The user needs OPCLK. Choose OPCLKDIV to put
* 6 <= R = f2 / f1 < 13, 1 <= OPCLKDIV <= 4.
* f_opclk = f_mclk * prescale * R / 4 / OPCLKDIV, where
* prescale = 1, or prescale = 2. Prescale is calculated inside
* pll_factors(). We have to select f_PLLOUT, such that
* f_mclk * 3 / 4 <= f_PLLOUT < f_mclk * 13 / 4. Must be
* f_mclk * 3 / 16 <= f_opclk < f_mclk * 13 / 4.
*/
if (16 * f_opclk < 3 * f_mclk || 4 * f_opclk >= 13 * f_mclk)
return -EINVAL;
if (4 * f_opclk < 3 * f_mclk)
/* Have to use OPCLKDIV */
opclk_div = (3 * f_mclk / 4 + f_opclk - 1) / f_opclk;
else
opclk_div = 1;
dev_dbg(codec->dev, "%s: OPCLKDIV=%d\n", __func__, opclk_div);
snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 0x30,
(opclk_div - 1) << 4);
wm8978->f_pllout = f_opclk * opclk_div;
} else if (f_256fs) {
/*
* Not using OPCLK, but PLL is used for the codec, choose R:
* 6 <= R = f2 / f1 < 13, to put 1 <= MCLKDIV <= 12.
* f_256fs = f_mclk * prescale * R / 4 / MCLKDIV, where
* prescale = 1, or prescale = 2. Prescale is calculated inside
* pll_factors(). We have to select f_PLLOUT, such that
* f_mclk * 3 / 4 <= f_PLLOUT < f_mclk * 13 / 4. Must be
* f_mclk * 3 / 48 <= f_256fs < f_mclk * 13 / 4. This means MCLK
* must be 3.781MHz <= f_MCLK <= 32.768MHz
*/
int idx = wm8978_enum_mclk(f_256fs, f_mclk, &wm8978->f_pllout);
if (idx < 0)
return idx;
wm8978->mclk_idx = idx;
} else {
return -EINVAL;
}
f2 = wm8978->f_pllout * 4;
dev_dbg(codec->dev, "%s: f_MCLK=%uHz, f_PLLOUT=%uHz\n", __func__,
wm8978->f_mclk, wm8978->f_pllout);
pll_factors(codec, &pll_div, f2, wm8978->f_mclk);
dev_dbg(codec->dev, "%s: calculated PLL N=0x%x, K=0x%x, div2=%d\n",
__func__, pll_div.n, pll_div.k, pll_div.div2);
/* Turn PLL off for configuration... */
snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0);
snd_soc_write(codec, WM8978_PLL_N, (pll_div.div2 << 4) | pll_div.n);
snd_soc_write(codec, WM8978_PLL_K1, pll_div.k >> 18);
snd_soc_write(codec, WM8978_PLL_K2, (pll_div.k >> 9) & 0x1ff);
snd_soc_write(codec, WM8978_PLL_K3, pll_div.k & 0x1ff);
/* ...and on again */
snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0x20);
if (f_opclk)
/* Output PLL (OPCLK) to GPIO1 */
snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 4);
return 0;
}
/*
* Configure WM8978 clock dividers.
*/
static int wm8978_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
int div_id, int div)
{
struct snd_soc_codec *codec = codec_dai->codec;
struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
int ret = 0;
switch (div_id) {
case WM8978_OPCLKRATE:
wm8978->f_opclk = div;
if (wm8978->f_mclk)
/*
* We know the MCLK frequency, the user has requested
* OPCLK, configure the PLL based on that and start it
* and OPCLK immediately. We will configure PLL to match
* user-requested OPCLK frquency as good as possible.
* In fact, it is likely, that matching the sampling
* rate, when it becomes known, is more important, and
* we will not be reconfiguring PLL then, because we
* must not interrupt OPCLK. But it should be fine,
* because typically the user will request OPCLK to run
* at 256fs or 512fs, and for these cases we will also
* find an exact MCLK divider configuration - it will
* be equal to or double the OPCLK divisor.
*/
ret = wm8978_configure_pll(codec);
break;
case WM8978_BCLKDIV:
if (div & ~0x1c)
return -EINVAL;
snd_soc_update_bits(codec, WM8978_CLOCKING, 0x1c, div);
break;
default:
return -EINVAL;
}
dev_dbg(codec->dev, "%s: ID %d, value %u\n", __func__, div_id, div);
return ret;
}
/*
* @freq: when .set_pll() us not used, freq is codec MCLK input frequency
*/
static int wm8978_set_dai_sysclk(struct snd_soc_dai *codec_dai, int clk_id,
unsigned int freq, int dir)
{
struct snd_soc_codec *codec = codec_dai->codec;
struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
int ret = 0;
dev_dbg(codec->dev, "%s: ID %d, freq %u\n", __func__, clk_id, freq);
if (freq) {
wm8978->f_mclk = freq;
/* Even if MCLK is used for system clock, might have to drive OPCLK */
if (wm8978->f_opclk)
ret = wm8978_configure_pll(codec);
/* Our sysclk is fixed to 256 * fs, will configure in .hw_params() */
if (!ret)
wm8978->sysclk = clk_id;
}
if (wm8978->sysclk == WM8978_PLL && (!freq || clk_id == WM8978_MCLK)) {
/* Clock CODEC directly from MCLK */
snd_soc_update_bits(codec, WM8978_CLOCKING, 0x100, 0);
/* GPIO1 into default mode as input - before configuring PLL */
snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 0);
/* Turn off PLL */
snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0);
wm8978->sysclk = WM8978_MCLK;
wm8978->f_pllout = 0;
wm8978->f_opclk = 0;
}
return ret;
}
/*
* Set ADC and Voice DAC format.
*/
static int wm8978_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
{
struct snd_soc_codec *codec = codec_dai->codec;
/*
* BCLK polarity mask = 0x100, LRC clock polarity mask = 0x80,
* Data Format mask = 0x18: all will be calculated anew
*/
u16 iface = snd_soc_read(codec, WM8978_AUDIO_INTERFACE) & ~0x198;
u16 clk = snd_soc_read(codec, WM8978_CLOCKING);
dev_dbg(codec->dev, "%s\n", __func__);
/* set master/slave audio interface */
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBM_CFM:
clk |= 1;
break;
case SND_SOC_DAIFMT_CBS_CFS:
clk &= ~1;
break;
default:
return -EINVAL;
}
/* interface format */
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S:
iface |= 0x10;
break;
case SND_SOC_DAIFMT_RIGHT_J:
break;
case SND_SOC_DAIFMT_LEFT_J:
iface |= 0x8;
break;
case SND_SOC_DAIFMT_DSP_A:
iface |= 0x18;
break;
default:
return -EINVAL;
}
/* clock inversion */
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_NB_NF:
break;
case SND_SOC_DAIFMT_IB_IF:
iface |= 0x180;
break;
case SND_SOC_DAIFMT_IB_NF:
iface |= 0x100;
break;
case SND_SOC_DAIFMT_NB_IF:
iface |= 0x80;
break;
default:
return -EINVAL;
}
snd_soc_write(codec, WM8978_AUDIO_INTERFACE, iface);
snd_soc_write(codec, WM8978_CLOCKING, clk);
return 0;
}
/*
* Set PCM DAI bit size and sample rate.
*/
static int wm8978_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct snd_soc_codec *codec = dai->codec;
struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
/* Word length mask = 0x60 */
u16 iface_ctl = snd_soc_read(codec, WM8978_AUDIO_INTERFACE) & ~0x60;
/* Sampling rate mask = 0xe (for filters) */
u16 add_ctl = snd_soc_read(codec, WM8978_ADDITIONAL_CONTROL) & ~0xe;
u16 clking = snd_soc_read(codec, WM8978_CLOCKING);
enum wm8978_sysclk_src current_clk_id = clking & 0x100 ?
WM8978_PLL : WM8978_MCLK;
unsigned int f_sel, diff, diff_best = INT_MAX;
int i, best = 0;
if (!wm8978->f_mclk)
return -EINVAL;
/* bit size */
switch (params_width(params)) {
case 16:
break;
case 20:
iface_ctl |= 0x20;
break;
case 24:
iface_ctl |= 0x40;
break;
case 32:
iface_ctl |= 0x60;
break;
}
/* filter coefficient */
switch (params_rate(params)) {
case 8000:
add_ctl |= 0x5 << 1;
break;
case 11025:
add_ctl |= 0x4 << 1;
break;
case 16000:
add_ctl |= 0x3 << 1;
break;
case 22050:
add_ctl |= 0x2 << 1;
break;
case 32000:
add_ctl |= 0x1 << 1;
break;
case 44100:
case 48000:
break;
}
/* Sampling rate is known now, can configure the MCLK divider */
wm8978->f_256fs = params_rate(params) * 256;
if (wm8978->sysclk == WM8978_MCLK) {
wm8978->mclk_idx = -1;
f_sel = wm8978->f_mclk;
} else {
if (!wm8978->f_opclk) {
/* We only enter here, if OPCLK is not used */
int ret = wm8978_configure_pll(codec);
if (ret < 0)
return ret;
}
f_sel = wm8978->f_pllout;
}
if (wm8978->mclk_idx < 0) {
/* Either MCLK is used directly, or OPCLK is used */
if (f_sel < wm8978->f_256fs || f_sel > 12 * wm8978->f_256fs)
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(mclk_numerator); i++) {
diff = abs(wm8978->f_256fs * 3 -
f_sel * 3 * mclk_denominator[i] / mclk_numerator[i]);
if (diff < diff_best) {
diff_best = diff;
best = i;
}
if (!diff)
break;
}
} else {
/* OPCLK not used, codec driven by PLL */
best = wm8978->mclk_idx;
diff = 0;
}
if (diff)
dev_warn(codec->dev, "Imprecise sampling rate: %uHz%s\n",
f_sel * mclk_denominator[best] / mclk_numerator[best] / 256,
wm8978->sysclk == WM8978_MCLK ?
", consider using PLL" : "");
dev_dbg(codec->dev, "%s: width %d, rate %u, MCLK divisor #%d\n", __func__,
params_width(params), params_rate(params), best);
/* MCLK divisor mask = 0xe0 */
snd_soc_update_bits(codec, WM8978_CLOCKING, 0xe0, best << 5);
snd_soc_write(codec, WM8978_AUDIO_INTERFACE, iface_ctl);
snd_soc_write(codec, WM8978_ADDITIONAL_CONTROL, add_ctl);
if (wm8978->sysclk != current_clk_id) {
if (wm8978->sysclk == WM8978_PLL)
/* Run CODEC from PLL instead of MCLK */
snd_soc_update_bits(codec, WM8978_CLOCKING,
0x100, 0x100);
else
/* Clock CODEC directly from MCLK */
snd_soc_update_bits(codec, WM8978_CLOCKING, 0x100, 0);
}
return 0;
}
static int wm8978_mute(struct snd_soc_dai *dai, int mute)
{
struct snd_soc_codec *codec = dai->codec;
dev_dbg(codec->dev, "%s: %d\n", __func__, mute);
if (mute)
snd_soc_update_bits(codec, WM8978_DAC_CONTROL, 0x40, 0x40);
else
snd_soc_update_bits(codec, WM8978_DAC_CONTROL, 0x40, 0);
return 0;
}
static int wm8978_set_bias_level(struct snd_soc_codec *codec,
enum snd_soc_bias_level level)
{
u16 power1 = snd_soc_read(codec, WM8978_POWER_MANAGEMENT_1) & ~3;
switch (level) {
case SND_SOC_BIAS_ON:
case SND_SOC_BIAS_PREPARE:
power1 |= 1; /* VMID 75k */
snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, power1);
break;
case SND_SOC_BIAS_STANDBY:
/* bit 3: enable bias, bit 2: enable I/O tie off buffer */
power1 |= 0xc;
if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
/* Initial cap charge at VMID 5k */
snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1,
power1 | 0x3);
mdelay(100);
}
power1 |= 0x2; /* VMID 500k */
snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, power1);
break;
case SND_SOC_BIAS_OFF:
/* Preserve PLL - OPCLK may be used by someone */
snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, ~0x20, 0);
snd_soc_write(codec, WM8978_POWER_MANAGEMENT_2, 0);
snd_soc_write(codec, WM8978_POWER_MANAGEMENT_3, 0);
break;
}
dev_dbg(codec->dev, "%s: %d, %x\n", __func__, level, power1);
codec->dapm.bias_level = level;
return 0;
}
#define WM8978_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
static const struct snd_soc_dai_ops wm8978_dai_ops = {
.hw_params = wm8978_hw_params,
.digital_mute = wm8978_mute,
.set_fmt = wm8978_set_dai_fmt,
.set_clkdiv = wm8978_set_dai_clkdiv,
.set_sysclk = wm8978_set_dai_sysclk,
};
/* Also supports 12kHz */
static struct snd_soc_dai_driver wm8978_dai = {
.name = "wm8978-hifi",
.playback = {
.stream_name = "Playback",
.channels_min = 1,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_48000,
.formats = WM8978_FORMATS,
},
.capture = {
.stream_name = "Capture",
.channels_min = 1,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_48000,
.formats = WM8978_FORMATS,
},
.ops = &wm8978_dai_ops,
.symmetric_rates = 1,
};
static int wm8978_suspend(struct snd_soc_codec *codec)
{
struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
wm8978_set_bias_level(codec, SND_SOC_BIAS_OFF);
/* Also switch PLL off */
snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, 0);
regcache_mark_dirty(wm8978->regmap);
return 0;
}
static int wm8978_resume(struct snd_soc_codec *codec)
{
struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
/* Sync reg_cache with the hardware */
regcache_sync(wm8978->regmap);
wm8978_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
if (wm8978->f_pllout)
/* Switch PLL on */
snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0x20);
return 0;
}
/*
* These registers contain an "update" bit - bit 8. This means, for example,
* that one can write new DAC digital volume for both channels, but only when
* the update bit is set, will also the volume be updated - simultaneously for
* both channels.
*/
static const int update_reg[] = {
WM8978_LEFT_DAC_DIGITAL_VOLUME,
WM8978_RIGHT_DAC_DIGITAL_VOLUME,
WM8978_LEFT_ADC_DIGITAL_VOLUME,
WM8978_RIGHT_ADC_DIGITAL_VOLUME,
WM8978_LEFT_INP_PGA_CONTROL,
WM8978_RIGHT_INP_PGA_CONTROL,
WM8978_LOUT1_HP_CONTROL,
WM8978_ROUT1_HP_CONTROL,
WM8978_LOUT2_SPK_CONTROL,
WM8978_ROUT2_SPK_CONTROL,
};
static int wm8978_probe(struct snd_soc_codec *codec)
{
struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
int i;
/*
* Set default system clock to PLL, it is more precise, this is also the
* default hardware setting
*/
wm8978->sysclk = WM8978_PLL;
/*
* Set the update bit in all registers, that have one. This way all
* writes to those registers will also cause the update bit to be
* written.
*/
for (i = 0; i < ARRAY_SIZE(update_reg); i++)
snd_soc_update_bits(codec, update_reg[i], 0x100, 0x100);
return 0;
}
static struct snd_soc_codec_driver soc_codec_dev_wm8978 = {
.probe = wm8978_probe,
.suspend = wm8978_suspend,
.resume = wm8978_resume,
.set_bias_level = wm8978_set_bias_level,
.controls = wm8978_snd_controls,
.num_controls = ARRAY_SIZE(wm8978_snd_controls),
.dapm_widgets = wm8978_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(wm8978_dapm_widgets),
.dapm_routes = wm8978_dapm_routes,
.num_dapm_routes = ARRAY_SIZE(wm8978_dapm_routes),
};
static const struct regmap_config wm8978_regmap_config = {
.reg_bits = 7,
.val_bits = 9,
.max_register = WM8978_MAX_REGISTER,
.volatile_reg = wm8978_volatile,
.cache_type = REGCACHE_RBTREE,
.reg_defaults = wm8978_reg_defaults,
.num_reg_defaults = ARRAY_SIZE(wm8978_reg_defaults),
};
static int wm8978_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct wm8978_priv *wm8978;
int ret;
wm8978 = devm_kzalloc(&i2c->dev, sizeof(struct wm8978_priv),
GFP_KERNEL);
if (wm8978 == NULL)
return -ENOMEM;
wm8978->regmap = devm_regmap_init_i2c(i2c, &wm8978_regmap_config);
if (IS_ERR(wm8978->regmap)) {
ret = PTR_ERR(wm8978->regmap);
dev_err(&i2c->dev, "Failed to allocate regmap: %d\n", ret);
return ret;
}
i2c_set_clientdata(i2c, wm8978);
/* Reset the codec */
ret = regmap_write(wm8978->regmap, WM8978_RESET, 0);
if (ret != 0) {
dev_err(&i2c->dev, "Failed to issue reset: %d\n", ret);
return ret;
}
ret = snd_soc_register_codec(&i2c->dev,
&soc_codec_dev_wm8978, &wm8978_dai, 1);
if (ret != 0) {
dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
return ret;
}
return 0;
}
static int wm8978_i2c_remove(struct i2c_client *client)
{
snd_soc_unregister_codec(&client->dev);
return 0;
}
static const struct i2c_device_id wm8978_i2c_id[] = {
{ "wm8978", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, wm8978_i2c_id);
static struct i2c_driver wm8978_i2c_driver = {
.driver = {
.name = "wm8978",
.owner = THIS_MODULE,
},
.probe = wm8978_i2c_probe,
.remove = wm8978_i2c_remove,
.id_table = wm8978_i2c_id,
};
module_i2c_driver(wm8978_i2c_driver);
MODULE_DESCRIPTION("ASoC WM8978 codec driver");
MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
MODULE_LICENSE("GPL");
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