sound/soc/codecs/sti-sas.c - kernel/quantenna - Git at Google

 /*
  * Copyright (C) STMicroelectronics SA 2015
  * Authors: Arnaud Pouliquen <arnaud.pouliquen@st.com>
  *          for STMicroelectronics.
  * License terms:  GNU General Public License (GPL), version 2
  */

 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>
 #include <linux/mfd/syscon.h>

 #include <sound/soc.h>
 #include <sound/soc-dapm.h>

 /* chipID supported */
 #define CHIPID_STIH416 0
 #define CHIPID_STIH407 1

 /* DAC definitions */

 /* stih416 DAC registers */
 /* sysconf 2517: Audio-DAC-Control */
 #define STIH416_AUDIO_DAC_CTRL 0x00000814
 /* sysconf 2519: Audio-Gue-Control */
 #define STIH416_AUDIO_GLUE_CTRL 0x0000081C

 #define STIH416_DAC_NOT_STANDBY	0x3
 #define STIH416_DAC_SOFTMUTE	0x4
 #define STIH416_DAC_ANA_NOT_PWR	0x5
 #define STIH416_DAC_NOT_PNDBG	0x6

 #define STIH416_DAC_NOT_STANDBY_MASK	BIT(STIH416_DAC_NOT_STANDBY)
 #define STIH416_DAC_SOFTMUTE_MASK	BIT(STIH416_DAC_SOFTMUTE)
 #define STIH416_DAC_ANA_NOT_PWR_MASK	BIT(STIH416_DAC_ANA_NOT_PWR)
 #define STIH416_DAC_NOT_PNDBG_MASK	BIT(STIH416_DAC_NOT_PNDBG)

 /* stih407 DAC registers */
 /* sysconf 5041: Audio-Gue-Control */
 #define STIH407_AUDIO_GLUE_CTRL 0x000000A4
 /* sysconf 5042: Audio-DAC-Control */
 #define STIH407_AUDIO_DAC_CTRL 0x000000A8

 /* DAC definitions */
 #define STIH407_DAC_SOFTMUTE		0x0
 #define STIH407_DAC_STANDBY_ANA		0x1
 #define STIH407_DAC_STANDBY		0x2

 #define STIH407_DAC_SOFTMUTE_MASK	BIT(STIH407_DAC_SOFTMUTE)
 #define STIH407_DAC_STANDBY_ANA_MASK    BIT(STIH407_DAC_STANDBY_ANA)
 #define STIH407_DAC_STANDBY_MASK        BIT(STIH407_DAC_STANDBY)

 /* SPDIF definitions */
 #define SPDIF_BIPHASE_ENABLE		0x6
 #define SPDIF_BIPHASE_IDLE		0x7

 #define SPDIF_BIPHASE_ENABLE_MASK	BIT(SPDIF_BIPHASE_ENABLE)
 #define SPDIF_BIPHASE_IDLE_MASK		BIT(SPDIF_BIPHASE_IDLE)

 enum {
 	STI_SAS_DAI_SPDIF_OUT,
 	STI_SAS_DAI_ANALOG_OUT,
 };

 static const struct reg_default stih416_sas_reg_defaults[] = {
 	{ STIH407_AUDIO_GLUE_CTRL, 0x00000040 },
 	{ STIH407_AUDIO_DAC_CTRL, 0x000000000 },
 };

 static const struct reg_default stih407_sas_reg_defaults[] = {
 	{ STIH416_AUDIO_DAC_CTRL, 0x000000000 },
 	{ STIH416_AUDIO_GLUE_CTRL, 0x00000040 },
 };

 struct sti_dac_audio {
 	struct regmap *regmap;
 	struct regmap *virt_regmap;
 	struct regmap_field  **field;
 	struct reset_control *rst;
 	int mclk;
 };

 struct sti_spdif_audio {
 	struct regmap *regmap;
 	struct regmap_field  **field;
 	int mclk;
 };

 /* device data structure */
 struct sti_sas_dev_data {
 	const int chipid; /* IC version */
 	const struct regmap_config *regmap;
 	const struct snd_soc_dai_ops *dac_ops;  /* DAC function callbacks */
 	const struct snd_soc_dapm_widget *dapm_widgets; /* dapms declaration */
 	const int num_dapm_widgets; /* dapms declaration */
 	const struct snd_soc_dapm_route *dapm_routes; /* route declaration */
 	const int num_dapm_routes; /* route declaration */
 };

 /* driver data structure */
 struct sti_sas_data {
 	struct device *dev;
 	const struct sti_sas_dev_data *dev_data;
 	struct sti_dac_audio dac;
 	struct sti_spdif_audio spdif;
 };

 /* Read a register from the sysconf reg bank */
 static int sti_sas_read_reg(void *context, unsigned int reg,
 			    unsigned int *value)
 {
 	struct sti_sas_data *drvdata = context;
 	int status;
 	u32 val;

 	status = regmap_read(drvdata->dac.regmap, reg, &val);
 	*value = (unsigned int)val;

 	return status;
 }

 /* Read a register from the sysconf reg bank */
 static int sti_sas_write_reg(void *context, unsigned int reg,
 			     unsigned int value)
 {
 	struct sti_sas_data *drvdata = context;
 	int status;

 	status = regmap_write(drvdata->dac.regmap, reg, value);

 	return status;
 }

 static int  sti_sas_init_sas_registers(struct snd_soc_codec *codec,
 				       struct sti_sas_data *data)
 {
 	int ret;
 	/*
 	 * DAC and SPDIF are activated by default
 	 * put them in IDLE to save power
 	 */

 	/* Initialise bi-phase formatter to disabled */
 	ret = snd_soc_update_bits(codec, STIH407_AUDIO_GLUE_CTRL,
 				  SPDIF_BIPHASE_ENABLE_MASK, 0);

 	if (!ret)
 		/* Initialise bi-phase formatter idle value to 0 */
 		ret = snd_soc_update_bits(codec, STIH407_AUDIO_GLUE_CTRL,
 					  SPDIF_BIPHASE_IDLE_MASK, 0);
 	if (ret < 0) {
 		dev_err(codec->dev, "Failed to update SPDIF registers");
 		return ret;
 	}

 	/* Init DAC configuration */
 	switch (data->dev_data->chipid) {
 	case CHIPID_STIH407:
 		/* init configuration */
 		ret =  snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL,
 					   STIH407_DAC_STANDBY_MASK,
 					   STIH407_DAC_STANDBY_MASK);

 		if (!ret)
 			ret = snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL,
 						  STIH407_DAC_STANDBY_ANA_MASK,
 						  STIH407_DAC_STANDBY_ANA_MASK);
 		if (!ret)
 			ret = snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL,
 						  STIH407_DAC_SOFTMUTE_MASK,
 						  STIH407_DAC_SOFTMUTE_MASK);
 		break;
 	case CHIPID_STIH416:
 		ret =  snd_soc_update_bits(codec, STIH416_AUDIO_DAC_CTRL,
 					   STIH416_DAC_NOT_STANDBY_MASK, 0);
 		if (!ret)
 			ret =  snd_soc_update_bits(codec,
 						   STIH416_AUDIO_DAC_CTRL,
 						   STIH416_DAC_ANA_NOT_PWR, 0);
 		if (!ret)
 			ret =  snd_soc_update_bits(codec,
 						   STIH416_AUDIO_DAC_CTRL,
 						   STIH416_DAC_NOT_PNDBG_MASK,
 						   0);
 		if (!ret)
 			ret =  snd_soc_update_bits(codec,
 						   STIH416_AUDIO_DAC_CTRL,
 						   STIH416_DAC_SOFTMUTE_MASK,
 						   STIH416_DAC_SOFTMUTE_MASK);
 		break;
 	default:
 		return -EINVAL;
 	}

 	if (ret < 0) {
 		dev_err(codec->dev, "Failed to update DAC registers");
 		return ret;
 	}

 	return ret;
 }

 /*
  * DAC
  */
 static int sti_sas_dac_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 {
 	/* Sanity check only */
 	if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) {
 		dev_err(dai->codec->dev,
 			"%s: ERROR: Unsupporter master mask 0x%x\n",
 			__func__, fmt & SND_SOC_DAIFMT_MASTER_MASK);
 		return -EINVAL;
 	}

 	return 0;
 }

 static int stih416_dac_probe(struct snd_soc_dai *dai)
 {
 	struct snd_soc_codec *codec = dai->codec;
 	struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev);
 	struct sti_dac_audio *dac = &drvdata->dac;

 	/* Get reset control */
 	dac->rst = devm_reset_control_get(codec->dev, "dac_rst");
 	if (IS_ERR(dac->rst)) {
 		dev_err(dai->codec->dev,
 			"%s: ERROR: DAC reset control not defined !\n",
 			__func__);
 		dac->rst = NULL;
 		return -EFAULT;
 	}
 	/* Put the DAC into reset */
 	reset_control_assert(dac->rst);

 	return 0;
 }

 static const struct snd_soc_dapm_widget stih416_sas_dapm_widgets[] = {
 	SND_SOC_DAPM_PGA("DAC bandgap", STIH416_AUDIO_DAC_CTRL,
 			 STIH416_DAC_NOT_PNDBG_MASK, 0, NULL, 0),
 	SND_SOC_DAPM_OUT_DRV("DAC standby ana", STIH416_AUDIO_DAC_CTRL,
 			     STIH416_DAC_ANA_NOT_PWR, 0, NULL, 0),
 	SND_SOC_DAPM_DAC("DAC standby",  "dac_p", STIH416_AUDIO_DAC_CTRL,
 			 STIH416_DAC_NOT_STANDBY, 0),
 	SND_SOC_DAPM_OUTPUT("DAC Output"),
 };

 static const struct snd_soc_dapm_widget stih407_sas_dapm_widgets[] = {
 	SND_SOC_DAPM_OUT_DRV("DAC standby ana", STIH407_AUDIO_DAC_CTRL,
 			     STIH407_DAC_STANDBY_ANA, 1, NULL, 0),
 	SND_SOC_DAPM_DAC("DAC standby",  "dac_p", STIH407_AUDIO_DAC_CTRL,
 			 STIH407_DAC_STANDBY, 1),
 	SND_SOC_DAPM_OUTPUT("DAC Output"),
 };

 static const struct snd_soc_dapm_route stih416_sas_route[] = {
 	{"DAC Output", NULL, "DAC bandgap"},
 	{"DAC Output", NULL, "DAC standby ana"},
 	{"DAC standby ana", NULL, "DAC standby"},
 };

 static const struct snd_soc_dapm_route stih407_sas_route[] = {
 	{"DAC Output", NULL, "DAC standby ana"},
 	{"DAC standby ana", NULL, "DAC standby"},
 };

 static int stih416_sas_dac_mute(struct snd_soc_dai *dai, int mute, int stream)
 {
 	struct snd_soc_codec *codec = dai->codec;

 	if (mute) {
 		return snd_soc_update_bits(codec, STIH416_AUDIO_DAC_CTRL,
 					    STIH416_DAC_SOFTMUTE_MASK,
 					    STIH416_DAC_SOFTMUTE_MASK);
 	} else {
 		return snd_soc_update_bits(codec, STIH416_AUDIO_DAC_CTRL,
 					    STIH416_DAC_SOFTMUTE_MASK, 0);
 	}
 }

 static int stih407_sas_dac_mute(struct snd_soc_dai *dai, int mute, int stream)
 {
 	struct snd_soc_codec *codec = dai->codec;

 	if (mute) {
 		return snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL,
 					    STIH407_DAC_SOFTMUTE_MASK,
 					    STIH407_DAC_SOFTMUTE_MASK);
 	} else {
 		return snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL,
 					    STIH407_DAC_SOFTMUTE_MASK,
 					    0);
 	}
 }

 /*
  * SPDIF
  */
 static int sti_sas_spdif_set_fmt(struct snd_soc_dai *dai,
 				 unsigned int fmt)
 {
 	if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) {
 		dev_err(dai->codec->dev,
 			"%s: ERROR: Unsupporter master mask 0x%x\n",
 			__func__, fmt & SND_SOC_DAIFMT_MASTER_MASK);
 		return -EINVAL;
 	}

 	return 0;
 }

 /*
  * sti_sas_spdif_trigger:
  * Trigger function is used to ensure that BiPhase Formater is disabled
  * before CPU dai is stopped.
  * This is mandatory to avoid that BPF is stalled
  */
 static int sti_sas_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
 				 struct snd_soc_dai *dai)
 {
 	struct snd_soc_codec *codec = dai->codec;

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		return snd_soc_update_bits(codec, STIH407_AUDIO_GLUE_CTRL,
 					    SPDIF_BIPHASE_ENABLE_MASK,
 					    SPDIF_BIPHASE_ENABLE_MASK);
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 		return snd_soc_update_bits(codec, STIH407_AUDIO_GLUE_CTRL,
 					    SPDIF_BIPHASE_ENABLE_MASK,
 					    0);
 	default:
 		return -EINVAL;
 	}
 }

 static bool sti_sas_volatile_register(struct device *dev, unsigned int reg)
 {
 	if (reg == STIH407_AUDIO_GLUE_CTRL)
 		return true;

 	return false;
 }

 /*
  * CODEC DAIS
  */

 /*
  * sti_sas_set_sysclk:
  * get MCLK input frequency to check that MCLK-FS ratio is coherent
  */
 static int sti_sas_set_sysclk(struct snd_soc_dai *dai, int clk_id,
 			      unsigned int freq, int dir)
 {
 	struct snd_soc_codec *codec = dai->codec;
 	struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev);

 	if (dir == SND_SOC_CLOCK_OUT)
 		return 0;

 	if (clk_id != 0)
 		return -EINVAL;

 	switch (dai->id) {
 	case STI_SAS_DAI_SPDIF_OUT:
 		drvdata->spdif.mclk = freq;
 		break;

 	case STI_SAS_DAI_ANALOG_OUT:
 		drvdata->dac.mclk = freq;
 		break;
 	}

 	return 0;
 }

 static int sti_sas_prepare(struct snd_pcm_substream *substream,
 			   struct snd_soc_dai *dai)
 {
 	struct snd_soc_codec *codec = dai->codec;
 	struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev);
 	struct snd_pcm_runtime *runtime = substream->runtime;

 	switch (dai->id) {
 	case STI_SAS_DAI_SPDIF_OUT:
 		if ((drvdata->spdif.mclk / runtime->rate) != 128) {
 			dev_err(codec->dev, "unexpected mclk-fs ratio");
 			return -EINVAL;
 		}
 		break;
 	case STI_SAS_DAI_ANALOG_OUT:
 		if ((drvdata->dac.mclk / runtime->rate) != 256) {
 			dev_err(codec->dev, "unexpected mclk-fs ratio");
 			return -EINVAL;
 		}
 		break;
 	}

 	return 0;
 }

 static const struct snd_soc_dai_ops stih416_dac_ops = {
 	.set_fmt = sti_sas_dac_set_fmt,
 	.mute_stream = stih416_sas_dac_mute,
 	.prepare = sti_sas_prepare,
 	.set_sysclk = sti_sas_set_sysclk,
 };

 static const struct snd_soc_dai_ops stih407_dac_ops = {
 	.set_fmt = sti_sas_dac_set_fmt,
 	.mute_stream = stih407_sas_dac_mute,
 	.prepare = sti_sas_prepare,
 	.set_sysclk = sti_sas_set_sysclk,
 };

 static const struct regmap_config stih407_sas_regmap = {
 	.reg_bits = 32,
 	.val_bits = 32,

 	.max_register = STIH407_AUDIO_DAC_CTRL,
 	.reg_defaults = stih407_sas_reg_defaults,
 	.num_reg_defaults = ARRAY_SIZE(stih407_sas_reg_defaults),
 	.volatile_reg = sti_sas_volatile_register,
 	.cache_type = REGCACHE_RBTREE,
 	.reg_read = sti_sas_read_reg,
 	.reg_write = sti_sas_write_reg,
 };

 static const struct regmap_config stih416_sas_regmap = {
 	.reg_bits = 32,
 	.val_bits = 32,

 	.max_register = STIH416_AUDIO_DAC_CTRL,
 	.reg_defaults = stih416_sas_reg_defaults,
 	.num_reg_defaults = ARRAY_SIZE(stih416_sas_reg_defaults),
 	.volatile_reg = sti_sas_volatile_register,
 	.cache_type = REGCACHE_RBTREE,
 	.reg_read = sti_sas_read_reg,
 	.reg_write = sti_sas_write_reg,
 };

 static const struct sti_sas_dev_data stih416_data = {
 	.chipid = CHIPID_STIH416,
 	.regmap = &stih416_sas_regmap,
 	.dac_ops = &stih416_dac_ops,
 	.dapm_widgets = stih416_sas_dapm_widgets,
 	.num_dapm_widgets = ARRAY_SIZE(stih416_sas_dapm_widgets),
 	.dapm_routes =	stih416_sas_route,
 	.num_dapm_routes = ARRAY_SIZE(stih416_sas_route),
 };

 static const struct sti_sas_dev_data stih407_data = {
 	.chipid = CHIPID_STIH407,
 	.regmap = &stih407_sas_regmap,
 	.dac_ops = &stih407_dac_ops,
 	.dapm_widgets = stih407_sas_dapm_widgets,
 	.num_dapm_widgets = ARRAY_SIZE(stih407_sas_dapm_widgets),
 	.dapm_routes =	stih407_sas_route,
 	.num_dapm_routes = ARRAY_SIZE(stih407_sas_route),
 };

 static struct snd_soc_dai_driver sti_sas_dai[] = {
 	{
 		.name = "sas-dai-spdif-out",
 		.id = STI_SAS_DAI_SPDIF_OUT,
 		.playback = {
 			.stream_name = "spdif_p",
 			.channels_min = 2,
 			.channels_max = 2,
 			.rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
 				 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_64000 |
 				 SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
 				 SNDRV_PCM_RATE_192000,
 			.formats = SNDRV_PCM_FMTBIT_S16_LE |
 				   SNDRV_PCM_FMTBIT_S32_LE,
 		},
 		.ops = (struct snd_soc_dai_ops[]) {
 			{
 				.set_fmt = sti_sas_spdif_set_fmt,
 				.trigger = sti_sas_spdif_trigger,
 				.set_sysclk = sti_sas_set_sysclk,
 				.prepare = sti_sas_prepare,
 			}
 		},
 	},
 	{
 		.name = "sas-dai-dac",
 		.id = STI_SAS_DAI_ANALOG_OUT,
 		.playback = {
 			.stream_name = "dac_p",
 			.channels_min = 2,
 			.channels_max = 2,
 			.rates = SNDRV_PCM_RATE_8000_48000,
 			.formats = SNDRV_PCM_FMTBIT_S16_LE |
 				   SNDRV_PCM_FMTBIT_S32_LE,
 		},
 	},
 };

 #ifdef CONFIG_PM_SLEEP
 static int sti_sas_resume(struct snd_soc_codec *codec)
 {
 	struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev);

 	return sti_sas_init_sas_registers(codec, drvdata);
 }
 #else
 #define sti_sas_resume NULL
 #endif

 static int sti_sas_codec_probe(struct snd_soc_codec *codec)
 {
 	struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev);
 	int ret;

 	ret = sti_sas_init_sas_registers(codec, drvdata);

 	return ret;
 }

 static struct snd_soc_codec_driver sti_sas_driver = {
 	.probe = sti_sas_codec_probe,
 	.resume = sti_sas_resume,
 };

 static const struct of_device_id sti_sas_dev_match[] = {
 	{
 		.compatible = "st,stih416-sas-codec",
 		.data = &stih416_data,
 	},
 	{
 		.compatible = "st,stih407-sas-codec",
 		.data = &stih407_data,
 	},
 	{},
 };

 static int sti_sas_driver_probe(struct platform_device *pdev)
 {
 	struct device_node *pnode = pdev->dev.of_node;
 	struct sti_sas_data *drvdata;
 	const struct of_device_id *of_id;

 	/* Allocate device structure */
 	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct sti_sas_data),
 			       GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;

 	/* Populate data structure depending on compatibility */
 	of_id = of_match_node(sti_sas_dev_match, pnode);
 	if (!of_id->data) {
 		dev_err(&pdev->dev, "data associated to device is missing");
 		return -EINVAL;
 	}

 	drvdata->dev_data = (struct sti_sas_dev_data *)of_id->data;

 	/* Initialise device structure */
 	drvdata->dev = &pdev->dev;

 	/* Request the DAC & SPDIF registers memory region */
 	drvdata->dac.virt_regmap = devm_regmap_init(&pdev->dev, NULL, drvdata,
 						    drvdata->dev_data->regmap);
 	if (IS_ERR(drvdata->dac.virt_regmap)) {
 		dev_err(&pdev->dev, "audio registers not enabled\n");
 		return PTR_ERR(drvdata->dac.virt_regmap);
 	}

 	/* Request the syscon region */
 	drvdata->dac.regmap =
 		syscon_regmap_lookup_by_phandle(pnode, "st,syscfg");
 	if (IS_ERR(drvdata->dac.regmap)) {
 		dev_err(&pdev->dev, "syscon registers not available\n");
 		return PTR_ERR(drvdata->dac.regmap);
 	}
 	drvdata->spdif.regmap = drvdata->dac.regmap;

 	/* Set DAC dai probe */
 	if (drvdata->dev_data->chipid == CHIPID_STIH416)
 		sti_sas_dai[STI_SAS_DAI_ANALOG_OUT].probe = stih416_dac_probe;

 	sti_sas_dai[STI_SAS_DAI_ANALOG_OUT].ops = drvdata->dev_data->dac_ops;

 	/* Set dapms*/
 	sti_sas_driver.dapm_widgets = drvdata->dev_data->dapm_widgets;
 	sti_sas_driver.num_dapm_widgets = drvdata->dev_data->num_dapm_widgets;

 	sti_sas_driver.dapm_routes = drvdata->dev_data->dapm_routes;
 	sti_sas_driver.num_dapm_routes = drvdata->dev_data->num_dapm_routes;

 	/* Store context */
 	dev_set_drvdata(&pdev->dev, drvdata);

 	return snd_soc_register_codec(&pdev->dev, &sti_sas_driver,
 					sti_sas_dai,
 					ARRAY_SIZE(sti_sas_dai));
 }

 static int sti_sas_driver_remove(struct platform_device *pdev)
 {
 	snd_soc_unregister_codec(&pdev->dev);

 	return 0;
 }

 static struct platform_driver sti_sas_platform_driver = {
 	.driver = {
 		.name = "sti-sas-codec",
 		.of_match_table = sti_sas_dev_match,
 	},
 	.probe = sti_sas_driver_probe,
 	.remove = sti_sas_driver_remove,
 };

 module_platform_driver(sti_sas_platform_driver);

 MODULE_DESCRIPTION("audio codec for STMicroelectronics sti platforms");
 MODULE_AUTHOR("Arnaud.pouliquen@st.com");
 MODULE_LICENSE("GPL v2");
	/*
	* Copyright (C) STMicroelectronics SA 2015
	* Authors: Arnaud Pouliquen <arnaud.pouliquen@st.com>
	* for STMicroelectronics.
	* License terms: GNU General Public License (GPL), version 2
	*/

	#include <linux/io.h>
	#include <linux/module.h>
	#include <linux/regmap.h>
	#include <linux/reset.h>
	#include <linux/mfd/syscon.h>

	#include <sound/soc.h>
	#include <sound/soc-dapm.h>

	/* chipID supported */
	#define CHIPID_STIH416 0
	#define CHIPID_STIH407 1

	/* DAC definitions */

	/* stih416 DAC registers */
	/* sysconf 2517: Audio-DAC-Control */
	#define STIH416_AUDIO_DAC_CTRL 0x00000814
	/* sysconf 2519: Audio-Gue-Control */
	#define STIH416_AUDIO_GLUE_CTRL 0x0000081C

	#define STIH416_DAC_NOT_STANDBY 0x3
	#define STIH416_DAC_SOFTMUTE 0x4
	#define STIH416_DAC_ANA_NOT_PWR 0x5
	#define STIH416_DAC_NOT_PNDBG 0x6

	#define STIH416_DAC_NOT_STANDBY_MASK BIT(STIH416_DAC_NOT_STANDBY)
	#define STIH416_DAC_SOFTMUTE_MASK BIT(STIH416_DAC_SOFTMUTE)
	#define STIH416_DAC_ANA_NOT_PWR_MASK BIT(STIH416_DAC_ANA_NOT_PWR)
	#define STIH416_DAC_NOT_PNDBG_MASK BIT(STIH416_DAC_NOT_PNDBG)

	/* stih407 DAC registers */
	/* sysconf 5041: Audio-Gue-Control */
	#define STIH407_AUDIO_GLUE_CTRL 0x000000A4
	/* sysconf 5042: Audio-DAC-Control */
	#define STIH407_AUDIO_DAC_CTRL 0x000000A8

	/* DAC definitions */
	#define STIH407_DAC_SOFTMUTE 0x0
	#define STIH407_DAC_STANDBY_ANA 0x1
	#define STIH407_DAC_STANDBY 0x2

	#define STIH407_DAC_SOFTMUTE_MASK BIT(STIH407_DAC_SOFTMUTE)
	#define STIH407_DAC_STANDBY_ANA_MASK BIT(STIH407_DAC_STANDBY_ANA)
	#define STIH407_DAC_STANDBY_MASK BIT(STIH407_DAC_STANDBY)

	/* SPDIF definitions */
	#define SPDIF_BIPHASE_ENABLE 0x6
	#define SPDIF_BIPHASE_IDLE 0x7

	#define SPDIF_BIPHASE_ENABLE_MASK BIT(SPDIF_BIPHASE_ENABLE)
	#define SPDIF_BIPHASE_IDLE_MASK BIT(SPDIF_BIPHASE_IDLE)

	enum {
	STI_SAS_DAI_SPDIF_OUT,
	STI_SAS_DAI_ANALOG_OUT,
	};

	static const struct reg_default stih416_sas_reg_defaults[] = {
	{ STIH407_AUDIO_GLUE_CTRL, 0x00000040 },
	{ STIH407_AUDIO_DAC_CTRL, 0x000000000 },
	};

	static const struct reg_default stih407_sas_reg_defaults[] = {
	{ STIH416_AUDIO_DAC_CTRL, 0x000000000 },
	{ STIH416_AUDIO_GLUE_CTRL, 0x00000040 },
	};

	struct sti_dac_audio {
	struct regmap *regmap;
	struct regmap *virt_regmap;
	struct regmap_field **field;
	struct reset_control *rst;
	int mclk;
	};

	struct sti_spdif_audio {
	struct regmap *regmap;
	struct regmap_field **field;
	int mclk;
	};

	/* device data structure */
	struct sti_sas_dev_data {
	const int chipid; /* IC version */
	const struct regmap_config *regmap;
	const struct snd_soc_dai_ops dac_ops; / DAC function callbacks */
	const struct snd_soc_dapm_widget dapm_widgets; / dapms declaration */
	const int num_dapm_widgets; /* dapms declaration */
	const struct snd_soc_dapm_route dapm_routes; / route declaration */
	const int num_dapm_routes; /* route declaration */
	};

	/* driver data structure */
	struct sti_sas_data {
	struct device *dev;
	const struct sti_sas_dev_data *dev_data;
	struct sti_dac_audio dac;
	struct sti_spdif_audio spdif;
	};

	/* Read a register from the sysconf reg bank */
	static int sti_sas_read_reg(void *context, unsigned int reg,
	unsigned int *value)
	{
	struct sti_sas_data *drvdata = context;
	int status;
	u32 val;

	status = regmap_read(drvdata->dac.regmap, reg, &val);
	*value = (unsigned int)val;

	return status;
	}

	/* Read a register from the sysconf reg bank */
	static int sti_sas_write_reg(void *context, unsigned int reg,
	unsigned int value)
	{
	struct sti_sas_data *drvdata = context;
	int status;

	status = regmap_write(drvdata->dac.regmap, reg, value);

	return status;
	}

	static int sti_sas_init_sas_registers(struct snd_soc_codec *codec,
	struct sti_sas_data *data)
	{
	int ret;
	/*
	* DAC and SPDIF are activated by default
	* put them in IDLE to save power
	*/

	/* Initialise bi-phase formatter to disabled */
	ret = snd_soc_update_bits(codec, STIH407_AUDIO_GLUE_CTRL,
	SPDIF_BIPHASE_ENABLE_MASK, 0);

	if (!ret)
	/* Initialise bi-phase formatter idle value to 0 */
	ret = snd_soc_update_bits(codec, STIH407_AUDIO_GLUE_CTRL,
	SPDIF_BIPHASE_IDLE_MASK, 0);
	if (ret < 0) {
	dev_err(codec->dev, "Failed to update SPDIF registers");
	return ret;
	}

	/* Init DAC configuration */
	switch (data->dev_data->chipid) {
	case CHIPID_STIH407:
	/* init configuration */
	ret = snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL,
	STIH407_DAC_STANDBY_MASK,
	STIH407_DAC_STANDBY_MASK);

	if (!ret)
	ret = snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL,
	STIH407_DAC_STANDBY_ANA_MASK,
	STIH407_DAC_STANDBY_ANA_MASK);
	if (!ret)
	ret = snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL,
	STIH407_DAC_SOFTMUTE_MASK,
	STIH407_DAC_SOFTMUTE_MASK);
	break;
	case CHIPID_STIH416:
	ret = snd_soc_update_bits(codec, STIH416_AUDIO_DAC_CTRL,
	STIH416_DAC_NOT_STANDBY_MASK, 0);
	if (!ret)
	ret = snd_soc_update_bits(codec,
	STIH416_AUDIO_DAC_CTRL,
	STIH416_DAC_ANA_NOT_PWR, 0);
	if (!ret)
	ret = snd_soc_update_bits(codec,
	STIH416_AUDIO_DAC_CTRL,
	STIH416_DAC_NOT_PNDBG_MASK,
	0);
	if (!ret)
	ret = snd_soc_update_bits(codec,
	STIH416_AUDIO_DAC_CTRL,
	STIH416_DAC_SOFTMUTE_MASK,
	STIH416_DAC_SOFTMUTE_MASK);
	break;
	default:
	return -EINVAL;
	}

	if (ret < 0) {
	dev_err(codec->dev, "Failed to update DAC registers");
	return ret;
	}

	return ret;
	}

	/*
	* DAC
	*/
	static int sti_sas_dac_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
	{
	/* Sanity check only */
	if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) {
	dev_err(dai->codec->dev,
	"%s: ERROR: Unsupporter master mask 0x%x\n",
	__func__, fmt & SND_SOC_DAIFMT_MASTER_MASK);
	return -EINVAL;
	}

	return 0;
	}

	static int stih416_dac_probe(struct snd_soc_dai *dai)
	{
	struct snd_soc_codec *codec = dai->codec;
	struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev);
	struct sti_dac_audio *dac = &drvdata->dac;

	/* Get reset control */
	dac->rst = devm_reset_control_get(codec->dev, "dac_rst");
	if (IS_ERR(dac->rst)) {
	dev_err(dai->codec->dev,
	"%s: ERROR: DAC reset control not defined !\n",
	__func__);
	dac->rst = NULL;
	return -EFAULT;
	}
	/* Put the DAC into reset */
	reset_control_assert(dac->rst);

	return 0;
	}

	static const struct snd_soc_dapm_widget stih416_sas_dapm_widgets[] = {
	SND_SOC_DAPM_PGA("DAC bandgap", STIH416_AUDIO_DAC_CTRL,
	STIH416_DAC_NOT_PNDBG_MASK, 0, NULL, 0),
	SND_SOC_DAPM_OUT_DRV("DAC standby ana", STIH416_AUDIO_DAC_CTRL,
	STIH416_DAC_ANA_NOT_PWR, 0, NULL, 0),
	SND_SOC_DAPM_DAC("DAC standby", "dac_p", STIH416_AUDIO_DAC_CTRL,
	STIH416_DAC_NOT_STANDBY, 0),
	SND_SOC_DAPM_OUTPUT("DAC Output"),
	};

	static const struct snd_soc_dapm_widget stih407_sas_dapm_widgets[] = {
	SND_SOC_DAPM_OUT_DRV("DAC standby ana", STIH407_AUDIO_DAC_CTRL,
	STIH407_DAC_STANDBY_ANA, 1, NULL, 0),
	SND_SOC_DAPM_DAC("DAC standby", "dac_p", STIH407_AUDIO_DAC_CTRL,
	STIH407_DAC_STANDBY, 1),
	SND_SOC_DAPM_OUTPUT("DAC Output"),
	};

	static const struct snd_soc_dapm_route stih416_sas_route[] = {
	{"DAC Output", NULL, "DAC bandgap"},
	{"DAC Output", NULL, "DAC standby ana"},
	{"DAC standby ana", NULL, "DAC standby"},
	};

	static const struct snd_soc_dapm_route stih407_sas_route[] = {
	{"DAC Output", NULL, "DAC standby ana"},
	{"DAC standby ana", NULL, "DAC standby"},
	};

	static int stih416_sas_dac_mute(struct snd_soc_dai *dai, int mute, int stream)
	{
	struct snd_soc_codec *codec = dai->codec;

	if (mute) {
	return snd_soc_update_bits(codec, STIH416_AUDIO_DAC_CTRL,
	STIH416_DAC_SOFTMUTE_MASK,
	STIH416_DAC_SOFTMUTE_MASK);
	} else {
	return snd_soc_update_bits(codec, STIH416_AUDIO_DAC_CTRL,
	STIH416_DAC_SOFTMUTE_MASK, 0);
	}
	}

	static int stih407_sas_dac_mute(struct snd_soc_dai *dai, int mute, int stream)
	{
	struct snd_soc_codec *codec = dai->codec;

	if (mute) {
	return snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL,
	STIH407_DAC_SOFTMUTE_MASK,
	STIH407_DAC_SOFTMUTE_MASK);
	} else {
	return snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL,
	STIH407_DAC_SOFTMUTE_MASK,
	0);
	}
	}

	/*
	* SPDIF
	*/
	static int sti_sas_spdif_set_fmt(struct snd_soc_dai *dai,
	unsigned int fmt)
	{
	if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) {
	dev_err(dai->codec->dev,
	"%s: ERROR: Unsupporter master mask 0x%x\n",
	__func__, fmt & SND_SOC_DAIFMT_MASTER_MASK);
	return -EINVAL;
	}

	return 0;
	}

	/*
	* sti_sas_spdif_trigger:
	* Trigger function is used to ensure that BiPhase Formater is disabled
	* before CPU dai is stopped.
	* This is mandatory to avoid that BPF is stalled
	*/
	static int sti_sas_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
	struct snd_soc_dai *dai)
	{
	struct snd_soc_codec *codec = dai->codec;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	return snd_soc_update_bits(codec, STIH407_AUDIO_GLUE_CTRL,
	SPDIF_BIPHASE_ENABLE_MASK,
	SPDIF_BIPHASE_ENABLE_MASK);
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	return snd_soc_update_bits(codec, STIH407_AUDIO_GLUE_CTRL,
	SPDIF_BIPHASE_ENABLE_MASK,
	0);
	default:
	return -EINVAL;
	}
	}

	static bool sti_sas_volatile_register(struct device *dev, unsigned int reg)
	{
	if (reg == STIH407_AUDIO_GLUE_CTRL)
	return true;

	return false;
	}

	/*
	* CODEC DAIS
	*/

	/*
	* sti_sas_set_sysclk:
	* get MCLK input frequency to check that MCLK-FS ratio is coherent
	*/
	static int sti_sas_set_sysclk(struct snd_soc_dai *dai, int clk_id,
	unsigned int freq, int dir)
	{
	struct snd_soc_codec *codec = dai->codec;
	struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev);

	if (dir == SND_SOC_CLOCK_OUT)
	return 0;

	if (clk_id != 0)
	return -EINVAL;

	switch (dai->id) {
	case STI_SAS_DAI_SPDIF_OUT:
	drvdata->spdif.mclk = freq;
	break;

	case STI_SAS_DAI_ANALOG_OUT:
	drvdata->dac.mclk = freq;
	break;
	}

	return 0;
	}

	static int sti_sas_prepare(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct snd_soc_codec *codec = dai->codec;
	struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev);
	struct snd_pcm_runtime *runtime = substream->runtime;

	switch (dai->id) {
	case STI_SAS_DAI_SPDIF_OUT:
	if ((drvdata->spdif.mclk / runtime->rate) != 128) {
	dev_err(codec->dev, "unexpected mclk-fs ratio");
	return -EINVAL;
	}
	break;
	case STI_SAS_DAI_ANALOG_OUT:
	if ((drvdata->dac.mclk / runtime->rate) != 256) {
	dev_err(codec->dev, "unexpected mclk-fs ratio");
	return -EINVAL;
	}
	break;
	}

	return 0;
	}

	static const struct snd_soc_dai_ops stih416_dac_ops = {
	.set_fmt = sti_sas_dac_set_fmt,
	.mute_stream = stih416_sas_dac_mute,
	.prepare = sti_sas_prepare,
	.set_sysclk = sti_sas_set_sysclk,
	};

	static const struct snd_soc_dai_ops stih407_dac_ops = {
	.set_fmt = sti_sas_dac_set_fmt,
	.mute_stream = stih407_sas_dac_mute,
	.prepare = sti_sas_prepare,
	.set_sysclk = sti_sas_set_sysclk,
	};

	static const struct regmap_config stih407_sas_regmap = {
	.reg_bits = 32,
	.val_bits = 32,

	.max_register = STIH407_AUDIO_DAC_CTRL,
	.reg_defaults = stih407_sas_reg_defaults,
	.num_reg_defaults = ARRAY_SIZE(stih407_sas_reg_defaults),
	.volatile_reg = sti_sas_volatile_register,
	.cache_type = REGCACHE_RBTREE,
	.reg_read = sti_sas_read_reg,
	.reg_write = sti_sas_write_reg,
	};

	static const struct regmap_config stih416_sas_regmap = {
	.reg_bits = 32,
	.val_bits = 32,

	.max_register = STIH416_AUDIO_DAC_CTRL,
	.reg_defaults = stih416_sas_reg_defaults,
	.num_reg_defaults = ARRAY_SIZE(stih416_sas_reg_defaults),
	.volatile_reg = sti_sas_volatile_register,
	.cache_type = REGCACHE_RBTREE,
	.reg_read = sti_sas_read_reg,
	.reg_write = sti_sas_write_reg,
	};

	static const struct sti_sas_dev_data stih416_data = {
	.chipid = CHIPID_STIH416,
	.regmap = &stih416_sas_regmap,
	.dac_ops = &stih416_dac_ops,
	.dapm_widgets = stih416_sas_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(stih416_sas_dapm_widgets),
	.dapm_routes = stih416_sas_route,
	.num_dapm_routes = ARRAY_SIZE(stih416_sas_route),
	};

	static const struct sti_sas_dev_data stih407_data = {
	.chipid = CHIPID_STIH407,
	.regmap = &stih407_sas_regmap,
	.dac_ops = &stih407_dac_ops,
	.dapm_widgets = stih407_sas_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(stih407_sas_dapm_widgets),
	.dapm_routes = stih407_sas_route,
	.num_dapm_routes = ARRAY_SIZE(stih407_sas_route),
	};

	static struct snd_soc_dai_driver sti_sas_dai[] = {
	{
	.name = "sas-dai-spdif-out",
	.id = STI_SAS_DAI_SPDIF_OUT,
	.playback = {
	.stream_name = "spdif_p",
	.channels_min = 2,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_32000 \| SNDRV_PCM_RATE_44100 \|
	SNDRV_PCM_RATE_48000 \| SNDRV_PCM_RATE_64000 \|
	SNDRV_PCM_RATE_88200 \| SNDRV_PCM_RATE_96000 \|
	SNDRV_PCM_RATE_192000,
	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
	SNDRV_PCM_FMTBIT_S32_LE,
	},
	.ops = (struct snd_soc_dai_ops[]) {
	{
	.set_fmt = sti_sas_spdif_set_fmt,
	.trigger = sti_sas_spdif_trigger,
	.set_sysclk = sti_sas_set_sysclk,
	.prepare = sti_sas_prepare,
	}
	},
	},
	{
	.name = "sas-dai-dac",
	.id = STI_SAS_DAI_ANALOG_OUT,
	.playback = {
	.stream_name = "dac_p",
	.channels_min = 2,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_8000_48000,
	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
	SNDRV_PCM_FMTBIT_S32_LE,
	},
	},
	};

	#ifdef CONFIG_PM_SLEEP
	static int sti_sas_resume(struct snd_soc_codec *codec)
	{
	struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev);

	return sti_sas_init_sas_registers(codec, drvdata);
	}
	#else
	#define sti_sas_resume NULL
	#endif

	static int sti_sas_codec_probe(struct snd_soc_codec *codec)
	{
	struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev);
	int ret;

	ret = sti_sas_init_sas_registers(codec, drvdata);

	return ret;
	}

	static struct snd_soc_codec_driver sti_sas_driver = {
	.probe = sti_sas_codec_probe,
	.resume = sti_sas_resume,
	};

	static const struct of_device_id sti_sas_dev_match[] = {
	{
	.compatible = "st,stih416-sas-codec",
	.data = &stih416_data,
	},
	{
	.compatible = "st,stih407-sas-codec",
	.data = &stih407_data,
	},
	{},
	};

	static int sti_sas_driver_probe(struct platform_device *pdev)
	{
	struct device_node *pnode = pdev->dev.of_node;
	struct sti_sas_data *drvdata;
	const struct of_device_id *of_id;

	/* Allocate device structure */
	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct sti_sas_data),
	GFP_KERNEL);
	if (!drvdata)
	return -ENOMEM;

	/* Populate data structure depending on compatibility */
	of_id = of_match_node(sti_sas_dev_match, pnode);
	if (!of_id->data) {
	dev_err(&pdev->dev, "data associated to device is missing");
	return -EINVAL;
	}

	drvdata->dev_data = (struct sti_sas_dev_data *)of_id->data;

	/* Initialise device structure */
	drvdata->dev = &pdev->dev;

	/* Request the DAC & SPDIF registers memory region */
	drvdata->dac.virt_regmap = devm_regmap_init(&pdev->dev, NULL, drvdata,
	drvdata->dev_data->regmap);
	if (IS_ERR(drvdata->dac.virt_regmap)) {
	dev_err(&pdev->dev, "audio registers not enabled\n");
	return PTR_ERR(drvdata->dac.virt_regmap);
	}

	/* Request the syscon region */
	drvdata->dac.regmap =
	syscon_regmap_lookup_by_phandle(pnode, "st,syscfg");
	if (IS_ERR(drvdata->dac.regmap)) {
	dev_err(&pdev->dev, "syscon registers not available\n");
	return PTR_ERR(drvdata->dac.regmap);
	}
	drvdata->spdif.regmap = drvdata->dac.regmap;

	/* Set DAC dai probe */
	if (drvdata->dev_data->chipid == CHIPID_STIH416)
	sti_sas_dai[STI_SAS_DAI_ANALOG_OUT].probe = stih416_dac_probe;

	sti_sas_dai[STI_SAS_DAI_ANALOG_OUT].ops = drvdata->dev_data->dac_ops;

	/* Set dapms*/
	sti_sas_driver.dapm_widgets = drvdata->dev_data->dapm_widgets;
	sti_sas_driver.num_dapm_widgets = drvdata->dev_data->num_dapm_widgets;

	sti_sas_driver.dapm_routes = drvdata->dev_data->dapm_routes;
	sti_sas_driver.num_dapm_routes = drvdata->dev_data->num_dapm_routes;

	/* Store context */
	dev_set_drvdata(&pdev->dev, drvdata);

	return snd_soc_register_codec(&pdev->dev, &sti_sas_driver,
	sti_sas_dai,
	ARRAY_SIZE(sti_sas_dai));
	}

	static int sti_sas_driver_remove(struct platform_device *pdev)
	{
	snd_soc_unregister_codec(&pdev->dev);

	return 0;
	}

	static struct platform_driver sti_sas_platform_driver = {
	.driver = {
	.name = "sti-sas-codec",
	.of_match_table = sti_sas_dev_match,
	},
	.probe = sti_sas_driver_probe,
	.remove = sti_sas_driver_remove,
	};

	module_platform_driver(sti_sas_platform_driver);

	MODULE_DESCRIPTION("audio codec for STMicroelectronics sti platforms");
	MODULE_AUTHOR("Arnaud.pouliquen@st.com");
	MODULE_LICENSE("GPL v2");