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linux/sound/soc/codecs/wm8940.c
Lukasz Majewski a5c26ee572
ASoC: wm8940: Read chip ID when wm8940 codec probing 
The wm8940 provides the chip ID information via I2C. In this
patch this information is read and if not matching expected
value, the probe function is aborted.

This prevents from using (i.e. inserting) other wm89* modules
which use the same I2C bus address.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20221216094624.3849278-3-lukma@denx.de
Signed-off-by: Mark Brown <broonie@kernel.org>
2022-12-25 23:33:30 +00:00

872 lines
24 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0-only
/*
* wm8940.c -- WM8940 ALSA Soc Audio driver
*
* Author: Jonathan Cameron <jic23@cam.ac.uk>
*
* Based on wm8510.c
* Copyright 2006 Wolfson Microelectronics PLC.
* Author: Liam Girdwood <lrg@slimlogic.co.uk>
*
* Not currently handled:
* Notch filter control
* AUXMode (inverting vs mixer)
* No means to obtain current gain if alc enabled.
* No use made of gpio
* Fast VMID discharge for power down
* Soft Start
* DLR and ALR Swaps not enabled
* Digital Sidetone not supported
*/
#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 "wm8940.h"
struct wm8940_priv {
unsigned int mclk;
unsigned int fs;
struct regmap *regmap;
};
static bool wm8940_volatile_register(struct device *dev, unsigned int reg)
{
switch (reg) {
case WM8940_SOFTRESET:
return true;
default:
return false;
}
}
static bool wm8940_readable_register(struct device *dev, unsigned int reg)
{
switch (reg) {
case WM8940_SOFTRESET:
case WM8940_POWER1:
case WM8940_POWER2:
case WM8940_POWER3:
case WM8940_IFACE:
case WM8940_COMPANDINGCTL:
case WM8940_CLOCK:
case WM8940_ADDCNTRL:
case WM8940_GPIO:
case WM8940_CTLINT:
case WM8940_DAC:
case WM8940_DACVOL:
case WM8940_ADC:
case WM8940_ADCVOL:
case WM8940_NOTCH1:
case WM8940_NOTCH2:
case WM8940_NOTCH3:
case WM8940_NOTCH4:
case WM8940_NOTCH5:
case WM8940_NOTCH6:
case WM8940_NOTCH7:
case WM8940_NOTCH8:
case WM8940_DACLIM1:
case WM8940_DACLIM2:
case WM8940_ALC1:
case WM8940_ALC2:
case WM8940_ALC3:
case WM8940_NOISEGATE:
case WM8940_PLLN:
case WM8940_PLLK1:
case WM8940_PLLK2:
case WM8940_PLLK3:
case WM8940_ALC4:
case WM8940_INPUTCTL:
case WM8940_PGAGAIN:
case WM8940_ADCBOOST:
case WM8940_OUTPUTCTL:
case WM8940_SPKMIX:
case WM8940_SPKVOL:
case WM8940_MONOMIX:
return true;
default:
return false;
}
}
static const struct reg_default wm8940_reg_defaults[] = {
{ 0x1, 0x0000 }, /* Power 1 */
{ 0x2, 0x0000 }, /* Power 2 */
{ 0x3, 0x0000 }, /* Power 3 */
{ 0x4, 0x0010 }, /* Interface Control */
{ 0x5, 0x0000 }, /* Companding Control */
{ 0x6, 0x0140 }, /* Clock Control */
{ 0x7, 0x0000 }, /* Additional Controls */
{ 0x8, 0x0000 }, /* GPIO Control */
{ 0x9, 0x0002 }, /* Auto Increment Control */
{ 0xa, 0x0000 }, /* DAC Control */
{ 0xb, 0x00FF }, /* DAC Volume */
{ 0xe, 0x0100 }, /* ADC Control */
{ 0xf, 0x00FF }, /* ADC Volume */
{ 0x10, 0x0000 }, /* Notch Filter 1 Control 1 */
{ 0x11, 0x0000 }, /* Notch Filter 1 Control 2 */
{ 0x12, 0x0000 }, /* Notch Filter 2 Control 1 */
{ 0x13, 0x0000 }, /* Notch Filter 2 Control 2 */
{ 0x14, 0x0000 }, /* Notch Filter 3 Control 1 */
{ 0x15, 0x0000 }, /* Notch Filter 3 Control 2 */
{ 0x16, 0x0000 }, /* Notch Filter 4 Control 1 */
{ 0x17, 0x0000 }, /* Notch Filter 4 Control 2 */
{ 0x18, 0x0032 }, /* DAC Limit Control 1 */
{ 0x19, 0x0000 }, /* DAC Limit Control 2 */
{ 0x20, 0x0038 }, /* ALC Control 1 */
{ 0x21, 0x000B }, /* ALC Control 2 */
{ 0x22, 0x0032 }, /* ALC Control 3 */
{ 0x23, 0x0000 }, /* Noise Gate */
{ 0x24, 0x0041 }, /* PLLN */
{ 0x25, 0x000C }, /* PLLK1 */
{ 0x26, 0x0093 }, /* PLLK2 */
{ 0x27, 0x00E9 }, /* PLLK3 */
{ 0x2a, 0x0030 }, /* ALC Control 4 */
{ 0x2c, 0x0002 }, /* Input Control */
{ 0x2d, 0x0050 }, /* PGA Gain */
{ 0x2f, 0x0002 }, /* ADC Boost Control */
{ 0x31, 0x0002 }, /* Output Control */
{ 0x32, 0x0000 }, /* Speaker Mixer Control */
{ 0x36, 0x0079 }, /* Speaker Volume */
{ 0x38, 0x0000 }, /* Mono Mixer Control */
};
static const char *wm8940_companding[] = { "Off", "NC", "u-law", "A-law" };
static SOC_ENUM_SINGLE_DECL(wm8940_adc_companding_enum,
WM8940_COMPANDINGCTL, 1, wm8940_companding);
static SOC_ENUM_SINGLE_DECL(wm8940_dac_companding_enum,
WM8940_COMPANDINGCTL, 3, wm8940_companding);
static const char *wm8940_alc_mode_text[] = {"ALC", "Limiter"};
static SOC_ENUM_SINGLE_DECL(wm8940_alc_mode_enum,
WM8940_ALC3, 8, wm8940_alc_mode_text);
static const char *wm8940_mic_bias_level_text[] = {"0.9", "0.65"};
static SOC_ENUM_SINGLE_DECL(wm8940_mic_bias_level_enum,
WM8940_INPUTCTL, 8, wm8940_mic_bias_level_text);
static const char *wm8940_filter_mode_text[] = {"Audio", "Application"};
static SOC_ENUM_SINGLE_DECL(wm8940_filter_mode_enum,
WM8940_ADC, 7, wm8940_filter_mode_text);
static DECLARE_TLV_DB_SCALE(wm8940_spk_vol_tlv, -5700, 100, 1);
static DECLARE_TLV_DB_SCALE(wm8940_att_tlv, -1000, 1000, 0);
static DECLARE_TLV_DB_SCALE(wm8940_pga_vol_tlv, -1200, 75, 0);
static DECLARE_TLV_DB_SCALE(wm8940_alc_min_tlv, -1200, 600, 0);
static DECLARE_TLV_DB_SCALE(wm8940_alc_max_tlv, 675, 600, 0);
static DECLARE_TLV_DB_SCALE(wm8940_alc_tar_tlv, -2250, 50, 0);
static DECLARE_TLV_DB_SCALE(wm8940_lim_boost_tlv, 0, 100, 0);
static DECLARE_TLV_DB_SCALE(wm8940_lim_thresh_tlv, -600, 100, 0);
static DECLARE_TLV_DB_SCALE(wm8940_adc_tlv, -12750, 50, 1);
static DECLARE_TLV_DB_SCALE(wm8940_capture_boost_vol_tlv, 0, 2000, 0);
static const struct snd_kcontrol_new wm8940_snd_controls[] = {
SOC_SINGLE("Digital Loopback Switch", WM8940_COMPANDINGCTL,
6, 1, 0),
SOC_ENUM("DAC Companding", wm8940_dac_companding_enum),
SOC_ENUM("ADC Companding", wm8940_adc_companding_enum),
SOC_ENUM("ALC Mode", wm8940_alc_mode_enum),
SOC_SINGLE("ALC Switch", WM8940_ALC1, 8, 1, 0),
SOC_SINGLE_TLV("ALC Capture Max Gain", WM8940_ALC1,
3, 7, 1, wm8940_alc_max_tlv),
SOC_SINGLE_TLV("ALC Capture Min Gain", WM8940_ALC1,
0, 7, 0, wm8940_alc_min_tlv),
SOC_SINGLE_TLV("ALC Capture Target", WM8940_ALC2,
0, 14, 0, wm8940_alc_tar_tlv),
SOC_SINGLE("ALC Capture Hold", WM8940_ALC2, 4, 10, 0),
SOC_SINGLE("ALC Capture Decay", WM8940_ALC3, 4, 10, 0),
SOC_SINGLE("ALC Capture Attach", WM8940_ALC3, 0, 10, 0),
SOC_SINGLE("ALC ZC Switch", WM8940_ALC4, 1, 1, 0),
SOC_SINGLE("ALC Capture Noise Gate Switch", WM8940_NOISEGATE,
3, 1, 0),
SOC_SINGLE("ALC Capture Noise Gate Threshold", WM8940_NOISEGATE,
0, 7, 0),
SOC_SINGLE("DAC Playback Limiter Switch", WM8940_DACLIM1, 8, 1, 0),
SOC_SINGLE("DAC Playback Limiter Attack", WM8940_DACLIM1, 0, 9, 0),
SOC_SINGLE("DAC Playback Limiter Decay", WM8940_DACLIM1, 4, 11, 0),
SOC_SINGLE_TLV("DAC Playback Limiter Threshold", WM8940_DACLIM2,
4, 9, 1, wm8940_lim_thresh_tlv),
SOC_SINGLE_TLV("DAC Playback Limiter Boost", WM8940_DACLIM2,
0, 12, 0, wm8940_lim_boost_tlv),
SOC_SINGLE("Capture PGA ZC Switch", WM8940_PGAGAIN, 7, 1, 0),
SOC_SINGLE_TLV("Capture PGA Volume", WM8940_PGAGAIN,
0, 63, 0, wm8940_pga_vol_tlv),
SOC_SINGLE_TLV("Digital Playback Volume", WM8940_DACVOL,
0, 255, 0, wm8940_adc_tlv),
SOC_SINGLE_TLV("Digital Capture Volume", WM8940_ADCVOL,
0, 255, 0, wm8940_adc_tlv),
SOC_ENUM("Mic Bias Level", wm8940_mic_bias_level_enum),
SOC_SINGLE_TLV("Capture Boost Volue", WM8940_ADCBOOST,
8, 1, 0, wm8940_capture_boost_vol_tlv),
SOC_SINGLE_TLV("Speaker Playback Volume", WM8940_SPKVOL,
0, 63, 0, wm8940_spk_vol_tlv),
SOC_SINGLE("Speaker Playback Switch", WM8940_SPKVOL, 6, 1, 1),
SOC_SINGLE_TLV("Speaker Mixer Line Bypass Volume", WM8940_SPKVOL,
8, 1, 1, wm8940_att_tlv),
SOC_SINGLE("Speaker Playback ZC Switch", WM8940_SPKVOL, 7, 1, 0),
SOC_SINGLE("Mono Out Switch", WM8940_MONOMIX, 6, 1, 1),
SOC_SINGLE_TLV("Mono Mixer Line Bypass Volume", WM8940_MONOMIX,
7, 1, 1, wm8940_att_tlv),
SOC_SINGLE("High Pass Filter Switch", WM8940_ADC, 8, 1, 0),
SOC_ENUM("High Pass Filter Mode", wm8940_filter_mode_enum),
SOC_SINGLE("High Pass Filter Cut Off", WM8940_ADC, 4, 7, 0),
SOC_SINGLE("ADC Inversion Switch", WM8940_ADC, 0, 1, 0),
SOC_SINGLE("DAC Inversion Switch", WM8940_DAC, 0, 1, 0),
SOC_SINGLE("DAC Auto Mute Switch", WM8940_DAC, 2, 1, 0),
SOC_SINGLE("ZC Timeout Clock Switch", WM8940_ADDCNTRL, 0, 1, 0),
};
static const struct snd_kcontrol_new wm8940_speaker_mixer_controls[] = {
SOC_DAPM_SINGLE("Line Bypass Switch", WM8940_SPKMIX, 1, 1, 0),
SOC_DAPM_SINGLE("Aux Playback Switch", WM8940_SPKMIX, 5, 1, 0),
SOC_DAPM_SINGLE("PCM Playback Switch", WM8940_SPKMIX, 0, 1, 0),
};
static const struct snd_kcontrol_new wm8940_mono_mixer_controls[] = {
SOC_DAPM_SINGLE("Line Bypass Switch", WM8940_MONOMIX, 1, 1, 0),
SOC_DAPM_SINGLE("Aux Playback Switch", WM8940_MONOMIX, 2, 1, 0),
SOC_DAPM_SINGLE("PCM Playback Switch", WM8940_MONOMIX, 0, 1, 0),
};
static DECLARE_TLV_DB_SCALE(wm8940_boost_vol_tlv, -1500, 300, 1);
static const struct snd_kcontrol_new wm8940_input_boost_controls[] = {
SOC_DAPM_SINGLE("Mic PGA Switch", WM8940_PGAGAIN, 6, 1, 1),
SOC_DAPM_SINGLE_TLV("Aux Volume", WM8940_ADCBOOST,
0, 7, 0, wm8940_boost_vol_tlv),
SOC_DAPM_SINGLE_TLV("Mic Volume", WM8940_ADCBOOST,
4, 7, 0, wm8940_boost_vol_tlv),
};
static const struct snd_kcontrol_new wm8940_micpga_controls[] = {
SOC_DAPM_SINGLE("AUX Switch", WM8940_INPUTCTL, 2, 1, 0),
SOC_DAPM_SINGLE("MICP Switch", WM8940_INPUTCTL, 0, 1, 0),
SOC_DAPM_SINGLE("MICN Switch", WM8940_INPUTCTL, 1, 1, 0),
};
static const struct snd_soc_dapm_widget wm8940_dapm_widgets[] = {
SND_SOC_DAPM_MIXER("Speaker Mixer", WM8940_POWER3, 2, 0,
&wm8940_speaker_mixer_controls[0],
ARRAY_SIZE(wm8940_speaker_mixer_controls)),
SND_SOC_DAPM_MIXER("Mono Mixer", WM8940_POWER3, 3, 0,
&wm8940_mono_mixer_controls[0],
ARRAY_SIZE(wm8940_mono_mixer_controls)),
SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8940_POWER3, 0, 0),
SND_SOC_DAPM_PGA("SpkN Out", WM8940_POWER3, 5, 0, NULL, 0),
SND_SOC_DAPM_PGA("SpkP Out", WM8940_POWER3, 6, 0, NULL, 0),
SND_SOC_DAPM_PGA("Mono Out", WM8940_POWER3, 7, 0, NULL, 0),
SND_SOC_DAPM_OUTPUT("MONOOUT"),
SND_SOC_DAPM_OUTPUT("SPKOUTP"),
SND_SOC_DAPM_OUTPUT("SPKOUTN"),
SND_SOC_DAPM_PGA("Aux Input", WM8940_POWER1, 6, 0, NULL, 0),
SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8940_POWER2, 0, 0),
SND_SOC_DAPM_MIXER("Mic PGA", WM8940_POWER2, 2, 0,
&wm8940_micpga_controls[0],
ARRAY_SIZE(wm8940_micpga_controls)),
SND_SOC_DAPM_MIXER("Boost Mixer", WM8940_POWER2, 4, 0,
&wm8940_input_boost_controls[0],
ARRAY_SIZE(wm8940_input_boost_controls)),
SND_SOC_DAPM_MICBIAS("Mic Bias", WM8940_POWER1, 4, 0),
SND_SOC_DAPM_INPUT("MICN"),
SND_SOC_DAPM_INPUT("MICP"),
SND_SOC_DAPM_INPUT("AUX"),
};
static const struct snd_soc_dapm_route wm8940_dapm_routes[] = {
/* Mono output mixer */
{"Mono Mixer", "PCM Playback Switch", "DAC"},
{"Mono Mixer", "Aux Playback Switch", "Aux Input"},
{"Mono Mixer", "Line Bypass Switch", "Boost Mixer"},
/* Speaker output mixer */
{"Speaker Mixer", "PCM Playback Switch", "DAC"},
{"Speaker Mixer", "Aux Playback Switch", "Aux Input"},
{"Speaker Mixer", "Line Bypass Switch", "Boost Mixer"},
/* Outputs */
{"Mono Out", NULL, "Mono Mixer"},
{"MONOOUT", NULL, "Mono Out"},
{"SpkN Out", NULL, "Speaker Mixer"},
{"SpkP Out", NULL, "Speaker Mixer"},
{"SPKOUTN", NULL, "SpkN Out"},
{"SPKOUTP", NULL, "SpkP Out"},
/* Microphone PGA */
{"Mic PGA", "MICN Switch", "MICN"},
{"Mic PGA", "MICP Switch", "MICP"},
{"Mic PGA", "AUX Switch", "AUX"},
/* Boost Mixer */
{"Boost Mixer", "Mic PGA Switch", "Mic PGA"},
{"Boost Mixer", "Mic Volume", "MICP"},
{"Boost Mixer", "Aux Volume", "Aux Input"},
{"ADC", NULL, "Boost Mixer"},
};
#define wm8940_reset(c) snd_soc_component_write(c, WM8940_SOFTRESET, 0);
static int wm8940_set_dai_fmt(struct snd_soc_dai *codec_dai,
unsigned int fmt)
{
struct snd_soc_component *component = codec_dai->component;
u16 iface = snd_soc_component_read(component, WM8940_IFACE) & 0xFE67;
u16 clk = snd_soc_component_read(component, WM8940_CLOCK) & 0x1fe;
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBM_CFM:
clk |= 1;
break;
case SND_SOC_DAIFMT_CBS_CFS:
break;
default:
return -EINVAL;
}
snd_soc_component_write(component, WM8940_CLOCK, clk);
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S:
iface |= (2 << 3);
break;
case SND_SOC_DAIFMT_LEFT_J:
iface |= (1 << 3);
break;
case SND_SOC_DAIFMT_RIGHT_J:
break;
case SND_SOC_DAIFMT_DSP_A:
iface |= (3 << 3);
break;
case SND_SOC_DAIFMT_DSP_B:
iface |= (3 << 3) | (1 << 7);
break;
}
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_NB_NF:
break;
case SND_SOC_DAIFMT_NB_IF:
iface |= (1 << 7);
break;
case SND_SOC_DAIFMT_IB_NF:
iface |= (1 << 8);
break;
case SND_SOC_DAIFMT_IB_IF:
iface |= (1 << 8) | (1 << 7);
break;
}
snd_soc_component_write(component, WM8940_IFACE, iface);
return 0;
}
static int wm8940_update_clocks(struct snd_soc_dai *dai);
static int wm8940_i2s_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct snd_soc_component *component = dai->component;
struct wm8940_priv *priv = snd_soc_component_get_drvdata(component);
u16 iface = snd_soc_component_read(component, WM8940_IFACE) & 0xFD9F;
u16 addcntrl = snd_soc_component_read(component, WM8940_ADDCNTRL) & 0xFFF1;
u16 companding = snd_soc_component_read(component,
WM8940_COMPANDINGCTL) & 0xFFDF;
int ret;
priv->fs = params_rate(params);
ret = wm8940_update_clocks(dai);
if (ret)
return ret;
/* LoutR control */
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE
&& params_channels(params) == 2)
iface |= (1 << 9);
switch (params_rate(params)) {
case 8000:
addcntrl |= (0x5 << 1);
break;
case 11025:
addcntrl |= (0x4 << 1);
break;
case 16000:
addcntrl |= (0x3 << 1);
break;
case 22050:
addcntrl |= (0x2 << 1);
break;
case 32000:
addcntrl |= (0x1 << 1);
break;
case 44100:
case 48000:
break;
}
ret = snd_soc_component_write(component, WM8940_ADDCNTRL, addcntrl);
if (ret)
goto error_ret;
switch (params_width(params)) {
case 8:
companding = companding | (1 << 5);
break;
case 16:
break;
case 20:
iface |= (1 << 5);
break;
case 24:
iface |= (2 << 5);
break;
case 32:
iface |= (3 << 5);
break;
}
ret = snd_soc_component_write(component, WM8940_COMPANDINGCTL, companding);
if (ret)
goto error_ret;
ret = snd_soc_component_write(component, WM8940_IFACE, iface);
error_ret:
return ret;
}
static int wm8940_mute(struct snd_soc_dai *dai, int mute, int direction)
{
struct snd_soc_component *component = dai->component;
u16 mute_reg = snd_soc_component_read(component, WM8940_DAC) & 0xffbf;
if (mute)
mute_reg |= 0x40;
return snd_soc_component_write(component, WM8940_DAC, mute_reg);
}
static int wm8940_set_bias_level(struct snd_soc_component *component,
enum snd_soc_bias_level level)
{
struct wm8940_priv *wm8940 = snd_soc_component_get_drvdata(component);
u16 val;
u16 pwr_reg = snd_soc_component_read(component, WM8940_POWER1) & 0x1F0;
int ret = 0;
switch (level) {
case SND_SOC_BIAS_ON:
/* ensure bufioen and biasen */
pwr_reg |= (1 << 2) | (1 << 3);
/* Enable thermal shutdown */
val = snd_soc_component_read(component, WM8940_OUTPUTCTL);
ret = snd_soc_component_write(component, WM8940_OUTPUTCTL, val | 0x2);
if (ret)
break;
/* set vmid to 75k */
ret = snd_soc_component_write(component, WM8940_POWER1, pwr_reg | 0x1);
break;
case SND_SOC_BIAS_PREPARE:
/* ensure bufioen and biasen */
pwr_reg |= (1 << 2) | (1 << 3);
ret = snd_soc_component_write(component, WM8940_POWER1, pwr_reg | 0x1);
break;
case SND_SOC_BIAS_STANDBY:
if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_OFF) {
ret = regcache_sync(wm8940->regmap);
if (ret < 0) {
dev_err(component->dev, "Failed to sync cache: %d\n", ret);
return ret;
}
}
/* ensure bufioen and biasen */
pwr_reg |= (1 << 2) | (1 << 3);
/* set vmid to 300k for standby */
ret = snd_soc_component_write(component, WM8940_POWER1, pwr_reg | 0x2);
break;
case SND_SOC_BIAS_OFF:
ret = snd_soc_component_write(component, WM8940_POWER1, pwr_reg);
break;
}
return ret;
}
struct pll_ {
unsigned int pre_scale:2;
unsigned int n:4;
unsigned int k;
};
static struct pll_ pll_div;
/* The size in bits of the pll divide multiplied by 10
* to allow rounding later */
#define FIXED_PLL_SIZE ((1 << 24) * 10)
static void pll_factors(unsigned int target, unsigned int source)
{
unsigned long long Kpart;
unsigned int K, Ndiv, Nmod;
/* The left shift ist to avoid accuracy loss when right shifting */
Ndiv = target / source;
if (Ndiv > 12) {
source <<= 1;
/* Multiply by 2 */
pll_div.pre_scale = 0;
Ndiv = target / source;
} else if (Ndiv < 3) {
source >>= 2;
/* Divide by 4 */
pll_div.pre_scale = 3;
Ndiv = target / source;
} else if (Ndiv < 6) {
source >>= 1;
/* divide by 2 */
pll_div.pre_scale = 2;
Ndiv = target / source;
} else
pll_div.pre_scale = 1;
if ((Ndiv < 6) || (Ndiv > 12))
printk(KERN_WARNING
"WM8940 N value %d outwith recommended range!d\n",
Ndiv);
pll_div.n = Ndiv;
Nmod = target % source;
Kpart = FIXED_PLL_SIZE * (long long)Nmod;
do_div(Kpart, source);
K = Kpart & 0xFFFFFFFF;
/* Check if we need to round */
if ((K % 10) >= 5)
K += 5;
/* Move down to proper range now rounding is done */
K /= 10;
pll_div.k = K;
}
/* Untested at the moment */
static int wm8940_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id,
int source, unsigned int freq_in, unsigned int freq_out)
{
struct snd_soc_component *component = codec_dai->component;
u16 reg;
/* Turn off PLL */
reg = snd_soc_component_read(component, WM8940_POWER1);
snd_soc_component_write(component, WM8940_POWER1, reg & 0x1df);
if (freq_in == 0 || freq_out == 0) {
/* Clock CODEC directly from MCLK */
reg = snd_soc_component_read(component, WM8940_CLOCK);
snd_soc_component_write(component, WM8940_CLOCK, reg & 0x0ff);
/* Pll power down */
snd_soc_component_write(component, WM8940_PLLN, (1 << 7));
return 0;
}
/* Pll is followed by a frequency divide by 4 */
pll_factors(freq_out*4, freq_in);
if (pll_div.k)
snd_soc_component_write(component, WM8940_PLLN,
(pll_div.pre_scale << 4) | pll_div.n | (1 << 6));
else /* No factional component */
snd_soc_component_write(component, WM8940_PLLN,
(pll_div.pre_scale << 4) | pll_div.n);
snd_soc_component_write(component, WM8940_PLLK1, pll_div.k >> 18);
snd_soc_component_write(component, WM8940_PLLK2, (pll_div.k >> 9) & 0x1ff);
snd_soc_component_write(component, WM8940_PLLK3, pll_div.k & 0x1ff);
/* Enable the PLL */
reg = snd_soc_component_read(component, WM8940_POWER1);
snd_soc_component_write(component, WM8940_POWER1, reg | 0x020);
/* Run CODEC from PLL instead of MCLK */
reg = snd_soc_component_read(component, WM8940_CLOCK);
snd_soc_component_write(component, WM8940_CLOCK, reg | 0x100);
return 0;
}
static int wm8940_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
int div_id, int div)
{
struct snd_soc_component *component = codec_dai->component;
u16 reg;
int ret = 0;
switch (div_id) {
case WM8940_BCLKDIV:
reg = snd_soc_component_read(component, WM8940_CLOCK) & 0xFFE3;
ret = snd_soc_component_write(component, WM8940_CLOCK, reg | (div << 2));
break;
case WM8940_MCLKDIV:
reg = snd_soc_component_read(component, WM8940_CLOCK) & 0xFF1F;
ret = snd_soc_component_write(component, WM8940_CLOCK, reg | (div << 5));
break;
case WM8940_OPCLKDIV:
reg = snd_soc_component_read(component, WM8940_GPIO) & 0xFFCF;
ret = snd_soc_component_write(component, WM8940_GPIO, reg | (div << 4));
break;
}
return ret;
}
static unsigned int wm8940_get_mclkdiv(unsigned int f_in, unsigned int f_out,
int *mclkdiv)
{
unsigned int ratio = 2 * f_in / f_out;
if (ratio <= 2) {
*mclkdiv = WM8940_MCLKDIV_1;
ratio = 2;
} else if (ratio == 3) {
*mclkdiv = WM8940_MCLKDIV_1_5;
} else if (ratio == 4) {
*mclkdiv = WM8940_MCLKDIV_2;
} else if (ratio <= 6) {
*mclkdiv = WM8940_MCLKDIV_3;
ratio = 6;
} else if (ratio <= 8) {
*mclkdiv = WM8940_MCLKDIV_4;
ratio = 8;
} else if (ratio <= 12) {
*mclkdiv = WM8940_MCLKDIV_6;
ratio = 12;
} else if (ratio <= 16) {
*mclkdiv = WM8940_MCLKDIV_8;
ratio = 16;
} else {
*mclkdiv = WM8940_MCLKDIV_12;
ratio = 24;
}
return f_out * ratio / 2;
}
static int wm8940_update_clocks(struct snd_soc_dai *dai)
{
struct snd_soc_component *codec = dai->component;
struct wm8940_priv *priv = snd_soc_component_get_drvdata(codec);
unsigned int fs256;
unsigned int fpll = 0;
unsigned int f;
int mclkdiv;
if (!priv->mclk || !priv->fs)
return 0;
fs256 = 256 * priv->fs;
f = wm8940_get_mclkdiv(priv->mclk, fs256, &mclkdiv);
if (f != priv->mclk) {
/* The PLL performs best around 90MHz */
fpll = wm8940_get_mclkdiv(22500000, fs256, &mclkdiv);
}
wm8940_set_dai_pll(dai, 0, 0, priv->mclk, fpll);
wm8940_set_dai_clkdiv(dai, WM8940_MCLKDIV, mclkdiv);
return 0;
}
static int wm8940_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id,
unsigned int freq, int dir)
{
struct snd_soc_component *codec = dai->component;
struct wm8940_priv *priv = snd_soc_component_get_drvdata(codec);
if (dir != SND_SOC_CLOCK_IN)
return -EINVAL;
priv->mclk = freq;
return wm8940_update_clocks(dai);
}
#define WM8940_RATES SNDRV_PCM_RATE_8000_48000
#define WM8940_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
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 wm8940_dai_ops = {
.hw_params = wm8940_i2s_hw_params,
.set_sysclk = wm8940_set_dai_sysclk,
.mute_stream = wm8940_mute,
.set_fmt = wm8940_set_dai_fmt,
.set_clkdiv = wm8940_set_dai_clkdiv,
.set_pll = wm8940_set_dai_pll,
.no_capture_mute = 1,
};
static struct snd_soc_dai_driver wm8940_dai = {
.name = "wm8940-hifi",
.playback = {
.stream_name = "Playback",
.channels_min = 1,
.channels_max = 2,
.rates = WM8940_RATES,
.formats = WM8940_FORMATS,
},
.capture = {
.stream_name = "Capture",
.channels_min = 1,
.channels_max = 2,
.rates = WM8940_RATES,
.formats = WM8940_FORMATS,
},
.ops = &wm8940_dai_ops,
.symmetric_rate = 1,
};
static int wm8940_probe(struct snd_soc_component *component)
{
struct wm8940_setup_data *pdata = component->dev->platform_data;
int ret;
u16 reg;
/*
* Check chip ID for wm8940 - value of 0x00 offset
* SOFTWARE_RESET on write
* CHIP_ID on read
*/
reg = snd_soc_component_read(component, WM8940_SOFTRESET);
if (reg != WM8940_CHIP_ID) {
dev_err(component->dev, "Wrong wm8940 chip ID: 0x%x\n", reg);
return -ENODEV;
}
ret = wm8940_reset(component);
if (ret < 0) {
dev_err(component->dev, "Failed to issue reset\n");
return ret;
}
snd_soc_component_force_bias_level(component, SND_SOC_BIAS_STANDBY);
ret = snd_soc_component_write(component, WM8940_POWER1, 0x180);
if (ret < 0)
return ret;
if (pdata) {
reg = snd_soc_component_read(component, WM8940_OUTPUTCTL);
ret = snd_soc_component_write(component, WM8940_OUTPUTCTL, reg | pdata->vroi);
if (ret < 0)
return ret;
}
return ret;
}
static const struct snd_soc_component_driver soc_component_dev_wm8940 = {
.probe = wm8940_probe,
.set_bias_level = wm8940_set_bias_level,
.controls = wm8940_snd_controls,
.num_controls = ARRAY_SIZE(wm8940_snd_controls),
.dapm_widgets = wm8940_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(wm8940_dapm_widgets),
.dapm_routes = wm8940_dapm_routes,
.num_dapm_routes = ARRAY_SIZE(wm8940_dapm_routes),
.suspend_bias_off = 1,
.idle_bias_on = 1,
.use_pmdown_time = 1,
.endianness = 1,
};
static const struct regmap_config wm8940_regmap = {
.reg_bits = 8,
.val_bits = 16,
.max_register = WM8940_MONOMIX,
.reg_defaults = wm8940_reg_defaults,
.num_reg_defaults = ARRAY_SIZE(wm8940_reg_defaults),
.cache_type = REGCACHE_RBTREE,
.readable_reg = wm8940_readable_register,
.volatile_reg = wm8940_volatile_register,
};
static int wm8940_i2c_probe(struct i2c_client *i2c)
{
struct wm8940_priv *wm8940;
int ret;
wm8940 = devm_kzalloc(&i2c->dev, sizeof(struct wm8940_priv),
GFP_KERNEL);
if (wm8940 == NULL)
return -ENOMEM;
wm8940->regmap = devm_regmap_init_i2c(i2c, &wm8940_regmap);
if (IS_ERR(wm8940->regmap))
return PTR_ERR(wm8940->regmap);
i2c_set_clientdata(i2c, wm8940);
ret = devm_snd_soc_register_component(&i2c->dev,
&soc_component_dev_wm8940, &wm8940_dai, 1);
return ret;
}
static const struct i2c_device_id wm8940_i2c_id[] = {
{ "wm8940", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, wm8940_i2c_id);
static const struct of_device_id wm8940_of_match[] = {
{ .compatible = "wlf,wm8940", },
{ }
};
MODULE_DEVICE_TABLE(of, wm8940_of_match);
static struct i2c_driver wm8940_i2c_driver = {
.driver = {
.name = "wm8940",
.of_match_table = wm8940_of_match,
},
.probe_new = wm8940_i2c_probe,
.id_table = wm8940_i2c_id,
};
module_i2c_driver(wm8940_i2c_driver);
MODULE_DESCRIPTION("ASoC WM8940 driver");
MODULE_AUTHOR("Jonathan Cameron");
MODULE_LICENSE("GPL");
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