cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
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max9867.c (19634B)


      1// SPDX-License-Identifier: GPL-2.0
      2//
      3// MAX9867 ALSA SoC codec driver
      4//
      5// Copyright 2013-2015 Maxim Integrated Products
      6// Copyright 2018 Ladislav Michl <ladis@linux-mips.org>
      7//
      8
      9#include <linux/delay.h>
     10#include <linux/i2c.h>
     11#include <linux/module.h>
     12#include <linux/regmap.h>
     13#include <sound/pcm_params.h>
     14#include <sound/soc.h>
     15#include <sound/tlv.h>
     16#include "max9867.h"
     17
     18struct max9867_priv {
     19	struct regmap *regmap;
     20	const struct snd_pcm_hw_constraint_list *constraints;
     21	unsigned int sysclk, pclk;
     22	bool provider, dsp_a;
     23	unsigned int adc_dac_active;
     24};
     25
     26static const char *const max9867_spmode[] = {
     27	"Stereo Diff", "Mono Diff",
     28	"Stereo Cap", "Mono Cap",
     29	"Stereo Single", "Mono Single",
     30	"Stereo Single Fast", "Mono Single Fast"
     31};
     32static const char *const max9867_filter_text[] = {"IIR", "FIR"};
     33
     34static const char *const max9867_adc_dac_filter_text[] = {
     35	"Disabled",
     36	"Elliptical/16/256",
     37	"Butterworth/16/500",
     38	"Elliptical/8/256",
     39	"Butterworth/8/500",
     40	"Butterworth/8-24"
     41};
     42
     43enum max9867_adc_dac {
     44	MAX9867_ADC_LEFT,
     45	MAX9867_ADC_RIGHT,
     46	MAX9867_DAC_LEFT,
     47	MAX9867_DAC_RIGHT,
     48};
     49
     50static int max9867_adc_dac_event(struct snd_soc_dapm_widget *w,
     51	struct snd_kcontrol *kcontrol, int event)
     52{
     53	struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
     54	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
     55	enum max9867_adc_dac adc_dac;
     56
     57	if (!strcmp(w->name, "ADCL"))
     58		adc_dac = MAX9867_ADC_LEFT;
     59	else if (!strcmp(w->name, "ADCR"))
     60		adc_dac = MAX9867_ADC_RIGHT;
     61	else if (!strcmp(w->name, "DACL"))
     62		adc_dac = MAX9867_DAC_LEFT;
     63	else if (!strcmp(w->name, "DACR"))
     64		adc_dac = MAX9867_DAC_RIGHT;
     65	else
     66		return 0;
     67
     68	if (SND_SOC_DAPM_EVENT_ON(event))
     69		max9867->adc_dac_active |= BIT(adc_dac);
     70	else if (SND_SOC_DAPM_EVENT_OFF(event))
     71		max9867->adc_dac_active &= ~BIT(adc_dac);
     72
     73	return 0;
     74}
     75
     76static int max9867_filter_get(struct snd_kcontrol *kcontrol,
     77			      struct snd_ctl_elem_value *ucontrol)
     78{
     79	struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
     80	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
     81	unsigned int reg;
     82	int ret;
     83
     84	ret = regmap_read(max9867->regmap, MAX9867_CODECFLTR, &reg);
     85	if (ret)
     86		return -EINVAL;
     87
     88	if (reg & MAX9867_CODECFLTR_MODE)
     89		ucontrol->value.enumerated.item[0] = 1;
     90	else
     91		ucontrol->value.enumerated.item[0] = 0;
     92
     93	return 0;
     94}
     95
     96static int max9867_filter_set(struct snd_kcontrol *kcontrol,
     97			      struct snd_ctl_elem_value *ucontrol)
     98{
     99	struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
    100	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
    101	unsigned int reg, mode = ucontrol->value.enumerated.item[0];
    102	int ret;
    103
    104	if (mode > 1)
    105		return -EINVAL;
    106
    107	/* don't allow change if ADC/DAC active */
    108	if (max9867->adc_dac_active)
    109		return -EBUSY;
    110
    111	/* read current filter mode */
    112	ret = regmap_read(max9867->regmap, MAX9867_CODECFLTR, &reg);
    113	if (ret)
    114		return -EINVAL;
    115
    116	if (mode)
    117		mode = MAX9867_CODECFLTR_MODE;
    118
    119	/* check if change is needed */
    120	if ((reg & MAX9867_CODECFLTR_MODE) == mode)
    121		return 0;
    122
    123	/* shutdown codec before switching filter mode */
    124	regmap_update_bits(max9867->regmap, MAX9867_PWRMAN,
    125		MAX9867_PWRMAN_SHDN, 0);
    126
    127	/* switch filter mode */
    128	regmap_update_bits(max9867->regmap, MAX9867_CODECFLTR,
    129		MAX9867_CODECFLTR_MODE, mode);
    130
    131	/* out of shutdown now */
    132	regmap_update_bits(max9867->regmap, MAX9867_PWRMAN,
    133		MAX9867_PWRMAN_SHDN, MAX9867_PWRMAN_SHDN);
    134
    135	return 0;
    136}
    137
    138static SOC_ENUM_SINGLE_EXT_DECL(max9867_filter, max9867_filter_text);
    139static SOC_ENUM_SINGLE_DECL(max9867_dac_filter, MAX9867_CODECFLTR, 0,
    140	max9867_adc_dac_filter_text);
    141static SOC_ENUM_SINGLE_DECL(max9867_adc_filter, MAX9867_CODECFLTR, 4,
    142	max9867_adc_dac_filter_text);
    143static SOC_ENUM_SINGLE_DECL(max9867_spkmode, MAX9867_MODECONFIG, 0,
    144	max9867_spmode);
    145static const SNDRV_CTL_TLVD_DECLARE_DB_RANGE(max9867_master_tlv,
    146	 0,  2, TLV_DB_SCALE_ITEM(-8600, 200, 1),
    147	 3, 17, TLV_DB_SCALE_ITEM(-7800, 400, 0),
    148	18, 25, TLV_DB_SCALE_ITEM(-2000, 200, 0),
    149	26, 34, TLV_DB_SCALE_ITEM( -500, 100, 0),
    150	35, 40, TLV_DB_SCALE_ITEM(  350,  50, 0),
    151);
    152static DECLARE_TLV_DB_SCALE(max9867_mic_tlv, 0, 100, 0);
    153static DECLARE_TLV_DB_SCALE(max9867_line_tlv, -600, 200, 0);
    154static DECLARE_TLV_DB_SCALE(max9867_adc_tlv, -1200, 100, 0);
    155static DECLARE_TLV_DB_SCALE(max9867_dac_tlv, -1500, 100, 0);
    156static DECLARE_TLV_DB_SCALE(max9867_dacboost_tlv, 0, 600, 0);
    157static const SNDRV_CTL_TLVD_DECLARE_DB_RANGE(max9867_micboost_tlv,
    158	0, 2, TLV_DB_SCALE_ITEM(-2000, 2000, 1),
    159	3, 3, TLV_DB_SCALE_ITEM(3000, 0, 0),
    160);
    161
    162static const struct snd_kcontrol_new max9867_snd_controls[] = {
    163	SOC_DOUBLE_R_TLV("Master Playback Volume", MAX9867_LEFTVOL,
    164			MAX9867_RIGHTVOL, 0, 40, 1, max9867_master_tlv),
    165	SOC_DOUBLE_R_TLV("Line Capture Volume", MAX9867_LEFTLINELVL,
    166			MAX9867_RIGHTLINELVL, 0, 15, 1, max9867_line_tlv),
    167	SOC_DOUBLE_R_TLV("Mic Capture Volume", MAX9867_LEFTMICGAIN,
    168			MAX9867_RIGHTMICGAIN, 0, 20, 1, max9867_mic_tlv),
    169	SOC_DOUBLE_R_TLV("Mic Boost Capture Volume", MAX9867_LEFTMICGAIN,
    170			MAX9867_RIGHTMICGAIN, 5, 3, 0, max9867_micboost_tlv),
    171	SOC_SINGLE("Digital Sidetone Volume", MAX9867_SIDETONE, 0, 31, 1),
    172	SOC_SINGLE_TLV("Digital Playback Volume", MAX9867_DACLEVEL, 0, 15, 1,
    173			max9867_dac_tlv),
    174	SOC_SINGLE_TLV("Digital Boost Playback Volume", MAX9867_DACLEVEL, 4, 3, 0,
    175			max9867_dacboost_tlv),
    176	SOC_DOUBLE_TLV("Digital Capture Volume", MAX9867_ADCLEVEL, 4, 0, 15, 1,
    177			max9867_adc_tlv),
    178	SOC_ENUM("Speaker Mode", max9867_spkmode),
    179	SOC_SINGLE("Volume Smoothing Switch", MAX9867_MODECONFIG, 6, 1, 0),
    180	SOC_SINGLE("Line ZC Switch", MAX9867_MODECONFIG, 5, 1, 0),
    181	SOC_ENUM_EXT("DSP Filter", max9867_filter, max9867_filter_get, max9867_filter_set),
    182	SOC_ENUM("ADC Filter", max9867_adc_filter),
    183	SOC_ENUM("DAC Filter", max9867_dac_filter),
    184	SOC_SINGLE("Mono Playback Switch", MAX9867_IFC1B, 3, 1, 0),
    185};
    186
    187/* Input mixer */
    188static const struct snd_kcontrol_new max9867_input_mixer_controls[] = {
    189	SOC_DAPM_DOUBLE("Line Capture Switch", MAX9867_INPUTCONFIG, 7, 5, 1, 0),
    190	SOC_DAPM_DOUBLE("Mic Capture Switch", MAX9867_INPUTCONFIG, 6, 4, 1, 0),
    191};
    192
    193/* Output mixer */
    194static const struct snd_kcontrol_new max9867_output_mixer_controls[] = {
    195	SOC_DAPM_DOUBLE_R("Line Bypass Switch",
    196			  MAX9867_LEFTLINELVL, MAX9867_RIGHTLINELVL, 6, 1, 1),
    197};
    198
    199/* Sidetone mixer */
    200static const struct snd_kcontrol_new max9867_sidetone_mixer_controls[] = {
    201	SOC_DAPM_DOUBLE("Sidetone Switch", MAX9867_SIDETONE, 6, 7, 1, 0),
    202};
    203
    204/* Line out switch */
    205static const struct snd_kcontrol_new max9867_line_out_control =
    206	SOC_DAPM_DOUBLE_R("Switch",
    207			  MAX9867_LEFTVOL, MAX9867_RIGHTVOL, 6, 1, 1);
    208
    209/* DMIC mux */
    210static const char *const dmic_mux_text[] = {
    211	"ADC", "DMIC"
    212};
    213static SOC_ENUM_SINGLE_DECL(left_dmic_mux_enum,
    214			    MAX9867_MICCONFIG, 5, dmic_mux_text);
    215static SOC_ENUM_SINGLE_DECL(right_dmic_mux_enum,
    216			    MAX9867_MICCONFIG, 4, dmic_mux_text);
    217static const struct snd_kcontrol_new max9867_left_dmic_mux =
    218	SOC_DAPM_ENUM("DMICL Mux", left_dmic_mux_enum);
    219static const struct snd_kcontrol_new max9867_right_dmic_mux =
    220	SOC_DAPM_ENUM("DMICR Mux", right_dmic_mux_enum);
    221
    222static const struct snd_soc_dapm_widget max9867_dapm_widgets[] = {
    223	SND_SOC_DAPM_INPUT("MICL"),
    224	SND_SOC_DAPM_INPUT("MICR"),
    225	SND_SOC_DAPM_INPUT("DMICL"),
    226	SND_SOC_DAPM_INPUT("DMICR"),
    227	SND_SOC_DAPM_INPUT("LINL"),
    228	SND_SOC_DAPM_INPUT("LINR"),
    229
    230	SND_SOC_DAPM_PGA("Left Line Input", SND_SOC_NOPM, 0, 0, NULL, 0),
    231	SND_SOC_DAPM_PGA("Right Line Input", SND_SOC_NOPM, 0, 0, NULL, 0),
    232	SND_SOC_DAPM_MIXER_NAMED_CTL("Input Mixer", SND_SOC_NOPM, 0, 0,
    233				     max9867_input_mixer_controls,
    234				     ARRAY_SIZE(max9867_input_mixer_controls)),
    235	SND_SOC_DAPM_MUX("DMICL Mux", SND_SOC_NOPM, 0, 0,
    236			 &max9867_left_dmic_mux),
    237	SND_SOC_DAPM_MUX("DMICR Mux", SND_SOC_NOPM, 0, 0,
    238			 &max9867_right_dmic_mux),
    239	SND_SOC_DAPM_ADC_E("ADCL", "HiFi Capture", SND_SOC_NOPM, 0, 0,
    240			   max9867_adc_dac_event,
    241			   SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
    242	SND_SOC_DAPM_ADC_E("ADCR", "HiFi Capture", SND_SOC_NOPM, 0, 0,
    243			   max9867_adc_dac_event,
    244			   SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
    245
    246	SND_SOC_DAPM_MIXER("Digital", SND_SOC_NOPM, 0, 0,
    247			   max9867_sidetone_mixer_controls,
    248			   ARRAY_SIZE(max9867_sidetone_mixer_controls)),
    249	SND_SOC_DAPM_MIXER_NAMED_CTL("Output Mixer", SND_SOC_NOPM, 0, 0,
    250				     max9867_output_mixer_controls,
    251				     ARRAY_SIZE(max9867_output_mixer_controls)),
    252	SND_SOC_DAPM_DAC_E("DACL", "HiFi Playback", SND_SOC_NOPM, 0, 0,
    253			   max9867_adc_dac_event,
    254			   SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
    255	SND_SOC_DAPM_DAC_E("DACR", "HiFi Playback", SND_SOC_NOPM, 0, 0,
    256			   max9867_adc_dac_event,
    257			   SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
    258	SND_SOC_DAPM_SWITCH("Master Playback", SND_SOC_NOPM, 0, 0,
    259			    &max9867_line_out_control),
    260	SND_SOC_DAPM_OUTPUT("LOUT"),
    261	SND_SOC_DAPM_OUTPUT("ROUT"),
    262};
    263
    264static const struct snd_soc_dapm_route max9867_audio_map[] = {
    265	{"Left Line Input", NULL, "LINL"},
    266	{"Right Line Input", NULL, "LINR"},
    267	{"Input Mixer", "Mic Capture Switch", "MICL"},
    268	{"Input Mixer", "Mic Capture Switch", "MICR"},
    269	{"Input Mixer", "Line Capture Switch", "Left Line Input"},
    270	{"Input Mixer", "Line Capture Switch", "Right Line Input"},
    271	{"DMICL Mux", "DMIC", "DMICL"},
    272	{"DMICR Mux", "DMIC", "DMICR"},
    273	{"DMICL Mux", "ADC", "Input Mixer"},
    274	{"DMICR Mux", "ADC", "Input Mixer"},
    275	{"ADCL", NULL, "DMICL Mux"},
    276	{"ADCR", NULL, "DMICR Mux"},
    277
    278	{"Digital", "Sidetone Switch", "ADCL"},
    279	{"Digital", "Sidetone Switch", "ADCR"},
    280	{"DACL", NULL, "Digital"},
    281	{"DACR", NULL, "Digital"},
    282
    283	{"Output Mixer", "Line Bypass Switch", "Left Line Input"},
    284	{"Output Mixer", "Line Bypass Switch", "Right Line Input"},
    285	{"Output Mixer", NULL, "DACL"},
    286	{"Output Mixer", NULL, "DACR"},
    287	{"Master Playback", "Switch", "Output Mixer"},
    288	{"LOUT", NULL, "Master Playback"},
    289	{"ROUT", NULL, "Master Playback"},
    290};
    291
    292static const unsigned int max9867_rates_44k1[] = {
    293	11025, 22050, 44100,
    294};
    295
    296static const struct snd_pcm_hw_constraint_list max9867_constraints_44k1 = {
    297	.list = max9867_rates_44k1,
    298	.count = ARRAY_SIZE(max9867_rates_44k1),
    299};
    300
    301static const unsigned int max9867_rates_48k[] = {
    302	8000, 16000, 32000, 48000,
    303};
    304
    305static const struct snd_pcm_hw_constraint_list max9867_constraints_48k = {
    306	.list = max9867_rates_48k,
    307	.count = ARRAY_SIZE(max9867_rates_48k),
    308};
    309
    310static int max9867_startup(struct snd_pcm_substream *substream,
    311			   struct snd_soc_dai *dai)
    312{
    313        struct max9867_priv *max9867 =
    314		snd_soc_component_get_drvdata(dai->component);
    315
    316	if (max9867->constraints)
    317		snd_pcm_hw_constraint_list(substream->runtime, 0,
    318			SNDRV_PCM_HW_PARAM_RATE, max9867->constraints);
    319
    320	return 0;
    321}
    322
    323static int max9867_dai_hw_params(struct snd_pcm_substream *substream,
    324		struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
    325{
    326	int value;
    327	unsigned long int rate, ratio;
    328	struct snd_soc_component *component = dai->component;
    329	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
    330	unsigned int ni = DIV_ROUND_CLOSEST_ULL(96ULL * 0x10000 * params_rate(params),
    331						max9867->pclk);
    332
    333	/* set up the ni value */
    334	regmap_update_bits(max9867->regmap, MAX9867_AUDIOCLKHIGH,
    335		MAX9867_NI_HIGH_MASK, (0xFF00 & ni) >> 8);
    336	regmap_update_bits(max9867->regmap, MAX9867_AUDIOCLKLOW,
    337		MAX9867_NI_LOW_MASK, 0x00FF & ni);
    338	if (max9867->provider) {
    339		if (max9867->dsp_a) {
    340			value = MAX9867_IFC1B_48X;
    341		} else {
    342			rate = params_rate(params) * 2 * params_width(params);
    343			ratio = max9867->pclk / rate;
    344			switch (params_width(params)) {
    345			case 8:
    346			case 16:
    347				switch (ratio) {
    348				case 2:
    349					value = MAX9867_IFC1B_PCLK_2;
    350					break;
    351				case 4:
    352					value = MAX9867_IFC1B_PCLK_4;
    353					break;
    354				case 8:
    355					value = MAX9867_IFC1B_PCLK_8;
    356					break;
    357				case 16:
    358					value = MAX9867_IFC1B_PCLK_16;
    359					break;
    360				default:
    361					return -EINVAL;
    362				}
    363				break;
    364			case 24:
    365				value = MAX9867_IFC1B_48X;
    366				break;
    367			case 32:
    368				value = MAX9867_IFC1B_64X;
    369				break;
    370			default:
    371				return -EINVAL;
    372			}
    373		}
    374		regmap_update_bits(max9867->regmap, MAX9867_IFC1B,
    375			MAX9867_IFC1B_BCLK_MASK, value);
    376	} else {
    377		/*
    378		 * digital pll locks on to any externally supplied LRCLK signal
    379		 * and also enable rapid lock mode.
    380		 */
    381		regmap_update_bits(max9867->regmap, MAX9867_AUDIOCLKLOW,
    382			MAX9867_RAPID_LOCK, MAX9867_RAPID_LOCK);
    383		regmap_update_bits(max9867->regmap, MAX9867_AUDIOCLKHIGH,
    384			MAX9867_PLL, MAX9867_PLL);
    385	}
    386	return 0;
    387}
    388
    389static int max9867_mute(struct snd_soc_dai *dai, int mute, int direction)
    390{
    391	struct snd_soc_component *component = dai->component;
    392	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
    393
    394	return regmap_update_bits(max9867->regmap, MAX9867_DACLEVEL,
    395				  1 << 6, !!mute << 6);
    396}
    397
    398static int max9867_set_dai_sysclk(struct snd_soc_dai *codec_dai,
    399		int clk_id, unsigned int freq, int dir)
    400{
    401	struct snd_soc_component *component = codec_dai->component;
    402	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
    403	int value = 0;
    404
    405	/* Set the prescaler based on the master clock frequency*/
    406	if (freq >= 10000000 && freq <= 20000000) {
    407		value |= MAX9867_PSCLK_10_20;
    408		max9867->pclk = freq;
    409	} else if (freq >= 20000000 && freq <= 40000000) {
    410		value |= MAX9867_PSCLK_20_40;
    411		max9867->pclk = freq / 2;
    412	} else if (freq >= 40000000 && freq <= 60000000) {
    413		value |= MAX9867_PSCLK_40_60;
    414		max9867->pclk = freq / 4;
    415	} else {
    416		dev_err(component->dev,
    417			"Invalid clock frequency %uHz (required 10-60MHz)\n",
    418			freq);
    419		return -EINVAL;
    420	}
    421	if (freq % 48000 == 0)
    422		max9867->constraints = &max9867_constraints_48k;
    423	else if (freq % 44100 == 0)
    424		max9867->constraints = &max9867_constraints_44k1;
    425	else
    426		dev_warn(component->dev,
    427			 "Unable to set exact rate with %uHz clock frequency\n",
    428			 freq);
    429	max9867->sysclk = freq;
    430	value = value << MAX9867_PSCLK_SHIFT;
    431	/* exact integer mode is not supported */
    432	value &= ~MAX9867_FREQ_MASK;
    433	regmap_update_bits(max9867->regmap, MAX9867_SYSCLK,
    434			MAX9867_PSCLK_MASK, value);
    435	return 0;
    436}
    437
    438static int max9867_dai_set_fmt(struct snd_soc_dai *codec_dai,
    439		unsigned int fmt)
    440{
    441	struct snd_soc_component *component = codec_dai->component;
    442	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
    443	u8 iface1A, iface1B;
    444
    445	switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
    446	case SND_SOC_DAIFMT_CBP_CFP:
    447		max9867->provider = true;
    448		iface1A = MAX9867_MASTER;
    449		iface1B = MAX9867_IFC1B_48X;
    450		break;
    451	case SND_SOC_DAIFMT_CBC_CFC:
    452		max9867->provider = false;
    453		iface1A = iface1B = 0;
    454		break;
    455	default:
    456		return -EINVAL;
    457	}
    458
    459	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
    460	case SND_SOC_DAIFMT_I2S:
    461		max9867->dsp_a = false;
    462		iface1A |= MAX9867_I2S_DLY;
    463		break;
    464	case SND_SOC_DAIFMT_DSP_A:
    465		max9867->dsp_a = true;
    466		iface1A |= MAX9867_TDM_MODE | MAX9867_SDOUT_HIZ;
    467		break;
    468	default:
    469		return -EINVAL;
    470	}
    471
    472	/* Clock inversion bits, BCI and WCI */
    473	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
    474	case SND_SOC_DAIFMT_NB_NF:
    475		break;
    476	case SND_SOC_DAIFMT_IB_IF:
    477		iface1A |= MAX9867_WCI_MODE | MAX9867_BCI_MODE;
    478		break;
    479	case SND_SOC_DAIFMT_IB_NF:
    480		iface1A |= MAX9867_BCI_MODE;
    481		break;
    482	case SND_SOC_DAIFMT_NB_IF:
    483		iface1A |= MAX9867_WCI_MODE;
    484		break;
    485	default:
    486		return -EINVAL;
    487	}
    488
    489	regmap_write(max9867->regmap, MAX9867_IFC1A, iface1A);
    490	regmap_update_bits(max9867->regmap, MAX9867_IFC1B,
    491			   MAX9867_IFC1B_BCLK_MASK, iface1B);
    492
    493	return 0;
    494}
    495
    496static const struct snd_soc_dai_ops max9867_dai_ops = {
    497	.set_sysclk	= max9867_set_dai_sysclk,
    498	.set_fmt	= max9867_dai_set_fmt,
    499	.mute_stream	= max9867_mute,
    500	.startup	= max9867_startup,
    501	.hw_params	= max9867_dai_hw_params,
    502	.no_capture_mute = 1,
    503};
    504
    505static struct snd_soc_dai_driver max9867_dai[] = {
    506	{
    507	.name = "max9867-aif1",
    508	.playback = {
    509		.stream_name = "HiFi Playback",
    510		.channels_min = 2,
    511		.channels_max = 2,
    512		.rates = SNDRV_PCM_RATE_8000_48000,
    513		.formats = SNDRV_PCM_FMTBIT_S16_LE,
    514	},
    515	.capture = {
    516		.stream_name = "HiFi Capture",
    517		.channels_min = 2,
    518		.channels_max = 2,
    519		.rates = SNDRV_PCM_RATE_8000_48000,
    520		.formats = SNDRV_PCM_FMTBIT_S16_LE,
    521	},
    522	.ops = &max9867_dai_ops,
    523	.symmetric_rate = 1,
    524	}
    525};
    526
    527#ifdef CONFIG_PM
    528static int max9867_suspend(struct snd_soc_component *component)
    529{
    530	snd_soc_component_force_bias_level(component, SND_SOC_BIAS_OFF);
    531
    532	return 0;
    533}
    534
    535static int max9867_resume(struct snd_soc_component *component)
    536{
    537	snd_soc_component_force_bias_level(component, SND_SOC_BIAS_STANDBY);
    538
    539	return 0;
    540}
    541#else
    542#define max9867_suspend	NULL
    543#define max9867_resume	NULL
    544#endif
    545
    546static int max9867_set_bias_level(struct snd_soc_component *component,
    547				  enum snd_soc_bias_level level)
    548{
    549	int err;
    550	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
    551
    552	switch (level) {
    553	case SND_SOC_BIAS_STANDBY:
    554		if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_OFF) {
    555			err = regcache_sync(max9867->regmap);
    556			if (err)
    557				return err;
    558
    559			err = regmap_write(max9867->regmap,
    560					   MAX9867_PWRMAN, 0xff);
    561			if (err)
    562				return err;
    563		}
    564		break;
    565	case SND_SOC_BIAS_OFF:
    566		err = regmap_write(max9867->regmap, MAX9867_PWRMAN, 0);
    567		if (err)
    568			return err;
    569
    570		regcache_mark_dirty(max9867->regmap);
    571		break;
    572	default:
    573		break;
    574	}
    575
    576	return 0;
    577}
    578
    579static const struct snd_soc_component_driver max9867_component = {
    580	.controls		= max9867_snd_controls,
    581	.num_controls		= ARRAY_SIZE(max9867_snd_controls),
    582	.dapm_routes		= max9867_audio_map,
    583	.num_dapm_routes	= ARRAY_SIZE(max9867_audio_map),
    584	.dapm_widgets		= max9867_dapm_widgets,
    585	.num_dapm_widgets	= ARRAY_SIZE(max9867_dapm_widgets),
    586	.suspend		= max9867_suspend,
    587	.resume			= max9867_resume,
    588	.set_bias_level		= max9867_set_bias_level,
    589	.idle_bias_on		= 1,
    590	.use_pmdown_time	= 1,
    591	.endianness		= 1,
    592	.non_legacy_dai_naming	= 1,
    593};
    594
    595static bool max9867_volatile_register(struct device *dev, unsigned int reg)
    596{
    597	switch (reg) {
    598	case MAX9867_STATUS:
    599	case MAX9867_JACKSTATUS:
    600	case MAX9867_AUXHIGH:
    601	case MAX9867_AUXLOW:
    602		return true;
    603	default:
    604		return false;
    605	}
    606}
    607
    608static const struct regmap_config max9867_regmap = {
    609	.reg_bits	= 8,
    610	.val_bits	= 8,
    611	.max_register	= MAX9867_REVISION,
    612	.volatile_reg	= max9867_volatile_register,
    613	.cache_type	= REGCACHE_RBTREE,
    614};
    615
    616static int max9867_i2c_probe(struct i2c_client *i2c)
    617{
    618	struct max9867_priv *max9867;
    619	int ret, reg;
    620
    621	max9867 = devm_kzalloc(&i2c->dev, sizeof(*max9867), GFP_KERNEL);
    622	if (!max9867)
    623		return -ENOMEM;
    624
    625	i2c_set_clientdata(i2c, max9867);
    626	max9867->regmap = devm_regmap_init_i2c(i2c, &max9867_regmap);
    627	if (IS_ERR(max9867->regmap)) {
    628		ret = PTR_ERR(max9867->regmap);
    629		dev_err(&i2c->dev, "Failed to allocate regmap: %d\n", ret);
    630		return ret;
    631	}
    632	ret = regmap_read(max9867->regmap, MAX9867_REVISION, &reg);
    633	if (ret < 0) {
    634		dev_err(&i2c->dev, "Failed to read: %d\n", ret);
    635		return ret;
    636	}
    637	dev_info(&i2c->dev, "device revision: %x\n", reg);
    638	ret = devm_snd_soc_register_component(&i2c->dev, &max9867_component,
    639			max9867_dai, ARRAY_SIZE(max9867_dai));
    640	if (ret < 0)
    641		dev_err(&i2c->dev, "Failed to register component: %d\n", ret);
    642	return ret;
    643}
    644
    645static const struct i2c_device_id max9867_i2c_id[] = {
    646	{ "max9867", 0 },
    647	{ }
    648};
    649MODULE_DEVICE_TABLE(i2c, max9867_i2c_id);
    650
    651#ifdef CONFIG_OF
    652static const struct of_device_id max9867_of_match[] = {
    653	{ .compatible = "maxim,max9867", },
    654	{ }
    655};
    656MODULE_DEVICE_TABLE(of, max9867_of_match);
    657#endif
    658
    659static struct i2c_driver max9867_i2c_driver = {
    660	.driver = {
    661		.name = "max9867",
    662		.of_match_table = of_match_ptr(max9867_of_match),
    663	},
    664	.probe_new  = max9867_i2c_probe,
    665	.id_table = max9867_i2c_id,
    666};
    667
    668module_i2c_driver(max9867_i2c_driver);
    669
    670MODULE_AUTHOR("Ladislav Michl <ladis@linux-mips.org>");
    671MODULE_DESCRIPTION("ASoC MAX9867 driver");
    672MODULE_LICENSE("GPL");