Unverified Commit 157b68ba authored by Andreas Dannenberg's avatar Andreas Dannenberg Committed by Mark Brown
Browse files

ASoC: tas6424: Add support for TAS6424 digital amplifier 



The Texas Instruments TAS6424 device is a high-efficiency quad-channel
Class-D audio power amplifier. Its digital time division multiplexed
(TDM) interface enables up to 2 devices to share the same bus,
supporting a total of eight channels from one audio serial port.

Signed-off-by: default avatarAndreas Dannenberg <dannenberg@ti.com>
Signed-off-by: default avatarMichael Stecklein <m-stecklein@ti.com>
Signed-off-by: default avatarAndrew F. Davis <afd@ti.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 2e662342

sound/soc/codecs/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -148,6 +148,7 @@ config SND_SOC_ALL_CODECS 
	select SND_SOC_TAS5086 if I2C

	select SND_SOC_TAS571X if I2C

	select SND_SOC_TAS5720 if I2C

	select SND_SOC_TAS6424 if I2C

	select SND_SOC_TFA9879 if I2C

	select SND_SOC_TLV320AIC23_I2C if I2C

	select SND_SOC_TLV320AIC23_SPI if SPI_MASTER
@@ -883,6 +884,13 @@ config SND_SOC_TAS5720 
	  Enable support for Texas Instruments TAS5720L/M high-efficiency mono

	  Class-D audio power amplifiers.



config SND_SOC_TAS6424

	tristate "Texas Instruments TAS6424 Quad-Channel Audio amplifier"

	depends on I2C

	help

	  Enable support for Texas Instruments TAS6424 high-efficiency

	  digital input quad-channel Class-D audio power amplifiers.



config SND_SOC_TFA9879

	tristate "NXP Semiconductors TFA9879 amplifier"

	depends on I2C

sound/soc/codecs/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -156,6 +156,7 @@ snd-soc-sti-sas-objs := sti-sas.o 
snd-soc-tas5086-objs := tas5086.o

snd-soc-tas571x-objs := tas571x.o

snd-soc-tas5720-objs := tas5720.o

snd-soc-tas6424-objs := tas6424.o

snd-soc-tfa9879-objs := tfa9879.o

snd-soc-tlv320aic23-objs := tlv320aic23.o

snd-soc-tlv320aic23-i2c-objs := tlv320aic23-i2c.o
@@ -395,6 +396,7 @@ obj-$(CONFIG_SND_SOC_TAS2552) += snd-soc-tas2552.o 
obj-$(CONFIG_SND_SOC_TAS5086)	+= snd-soc-tas5086.o

obj-$(CONFIG_SND_SOC_TAS571X)	+= snd-soc-tas571x.o

obj-$(CONFIG_SND_SOC_TAS5720)	+= snd-soc-tas5720.o

obj-$(CONFIG_SND_SOC_TAS6424)	+= snd-soc-tas6424.o

obj-$(CONFIG_SND_SOC_TFA9879)	+= snd-soc-tfa9879.o

obj-$(CONFIG_SND_SOC_TLV320AIC23)	+= snd-soc-tlv320aic23.o

obj-$(CONFIG_SND_SOC_TLV320AIC23_I2C)	+= snd-soc-tlv320aic23-i2c.o

sound/soc/codecs/tas6424.c

0 → 100644
+707 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * ALSA SoC Texas Instruments TAS6424 Quad-Channel Audio Amplifier

 *

 * Copyright (C) 2016-2017 Texas Instruments Incorporated - http://www.ti.com/

 *	Author: Andreas Dannenberg <dannenberg@ti.com>

 *	Andrew F. Davis <afd@ti.com>

 */



#include <linux/module.h>

#include <linux/errno.h>

#include <linux/device.h>

#include <linux/i2c.h>

#include <linux/pm_runtime.h>

#include <linux/regmap.h>

#include <linux/slab.h>

#include <linux/regulator/consumer.h>

#include <linux/delay.h>



#include <sound/pcm.h>

#include <sound/pcm_params.h>

#include <sound/soc.h>

#include <sound/soc-dapm.h>

#include <sound/tlv.h>



#include "tas6424.h"



/* Define how often to check (and clear) the fault status register (in ms) */

#define TAS6424_FAULT_CHECK_INTERVAL 200



static const char * const tas6424_supply_names[] = {

	"dvdd", /* Digital power supply. Connect to 3.3-V supply. */

	"vbat", /* Supply used for higher voltage analog circuits. */

	"pvdd", /* Class-D amp output FETs supply. */

};

#define TAS6424_NUM_SUPPLIES ARRAY_SIZE(tas6424_supply_names)



struct tas6424_data {

	struct device *dev;

	struct regmap *regmap;

	struct regulator_bulk_data supplies[TAS6424_NUM_SUPPLIES];

	struct delayed_work fault_check_work;

	unsigned int last_fault1;

	unsigned int last_fault2;

	unsigned int last_warn;

};



/*

 * DAC digital volumes. From -103.5 to 24 dB in 0.5 dB steps. Note that

 * setting the gain below -100 dB (register value <0x7) is effectively a MUTE

 * as per device datasheet.

 */

static DECLARE_TLV_DB_SCALE(dac_tlv, -10350, 50, 0);



static const struct snd_kcontrol_new tas6424_snd_controls[] = {

	SOC_SINGLE_TLV("Speaker Driver CH1 Playback Volume",

		       TAS6424_CH1_VOL_CTRL, 0, 0xff, 0, dac_tlv),

	SOC_SINGLE_TLV("Speaker Driver CH2 Playback Volume",

		       TAS6424_CH2_VOL_CTRL, 0, 0xff, 0, dac_tlv),

	SOC_SINGLE_TLV("Speaker Driver CH3 Playback Volume",

		       TAS6424_CH3_VOL_CTRL, 0, 0xff, 0, dac_tlv),

	SOC_SINGLE_TLV("Speaker Driver CH4 Playback Volume",

		       TAS6424_CH4_VOL_CTRL, 0, 0xff, 0, dac_tlv),

};



static int tas6424_dac_event(struct snd_soc_dapm_widget *w,

			     struct snd_kcontrol *kcontrol, int event)

{

	struct snd_soc_codec *codec = snd_soc_dapm_to_codec(w->dapm);

	struct tas6424_data *tas6424 = snd_soc_codec_get_drvdata(codec);



	dev_dbg(codec->dev, "%s() event=0x%0x\n", __func__, event);



	if (event & SND_SOC_DAPM_POST_PMU) {

		/* Observe codec shutdown-to-active time */

		msleep(12);



		/* Turn on TAS6424 periodic fault checking/handling */

		tas6424->last_fault1 = 0;

		tas6424->last_fault2 = 0;

		tas6424->last_warn = 0;

		schedule_delayed_work(&tas6424->fault_check_work,

				      msecs_to_jiffies(TAS6424_FAULT_CHECK_INTERVAL));

	} else if (event & SND_SOC_DAPM_PRE_PMD) {

		/* Disable TAS6424 periodic fault checking/handling */

		cancel_delayed_work_sync(&tas6424->fault_check_work);

	}



	return 0;

}



static const struct snd_soc_dapm_widget tas6424_dapm_widgets[] = {

	SND_SOC_DAPM_AIF_IN("DAC IN", "Playback", 0, SND_SOC_NOPM, 0, 0),

	SND_SOC_DAPM_DAC_E("DAC", NULL, SND_SOC_NOPM, 0, 0, tas6424_dac_event,

			   SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),

	SND_SOC_DAPM_OUTPUT("OUT")

};



static const struct snd_soc_dapm_route tas6424_audio_map[] = {

	{ "DAC", NULL, "DAC IN" },

	{ "OUT", NULL, "DAC" },

};



static int tas6424_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;

	unsigned int rate = params_rate(params);

	unsigned int width = params_width(params);

	u8 sap_ctrl = 0;



	dev_dbg(codec->dev, "%s() rate=%u width=%u\n", __func__, rate, width);



	switch (rate) {

	case 44100:

		sap_ctrl |= TAS6424_SAP_RATE_44100;

		break;

	case 48000:

		sap_ctrl |= TAS6424_SAP_RATE_48000;

		break;

	case 96000:

		sap_ctrl |= TAS6424_SAP_RATE_96000;

		break;

	default:

		dev_err(codec->dev, "unsupported sample rate: %u\n", rate);

		return -EINVAL;

	}



	switch (width) {

	case 16:

		sap_ctrl |= TAS6424_SAP_TDM_SLOT_SZ_16;

		break;

	case 24:

		break;

	default:

		dev_err(codec->dev, "unsupported sample width: %u\n", width);

		return -EINVAL;

	}



	snd_soc_update_bits(codec, TAS6424_SAP_CTRL,

			    TAS6424_SAP_RATE_MASK |

			    TAS6424_SAP_TDM_SLOT_SZ_16,

			    sap_ctrl);



	return 0;

}



static int tas6424_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)

{

	struct snd_soc_codec *codec = dai->codec;

	u8 serial_format = 0;



	dev_dbg(codec->dev, "%s() fmt=0x%0x\n", __func__, fmt);



	/* clock masters */

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {

	case SND_SOC_DAIFMT_CBS_CFS:

		break;

	default:

		dev_err(codec->dev, "Invalid DAI master/slave interface\n");

		return -EINVAL;

	}



	/* signal polarity */

	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {

	case SND_SOC_DAIFMT_NB_NF:

		break;

	default:

		dev_err(codec->dev, "Invalid DAI clock signal polarity\n");

		return -EINVAL;

	}



	/* interface format */

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {

	case SND_SOC_DAIFMT_I2S:

		serial_format |= TAS6424_SAP_I2S;

		break;

	case SND_SOC_DAIFMT_DSP_A:

		serial_format |= TAS6424_SAP_DSP;

		break;

	case SND_SOC_DAIFMT_DSP_B:

		/*

		 * We can use the fact that the TAS6424 does not care about the

		 * LRCLK duty cycle during TDM to receive DSP_B formatted data

		 * in LEFTJ mode (no delaying of the 1st data bit).

		 */

		serial_format |= TAS6424_SAP_LEFTJ;

		break;

	case SND_SOC_DAIFMT_LEFT_J:

		serial_format |= TAS6424_SAP_LEFTJ;

		break;

	default:

		dev_err(codec->dev, "Invalid DAI interface format\n");

		return -EINVAL;

	}



	snd_soc_update_bits(codec, TAS6424_SAP_CTRL,

			    TAS6424_SAP_FMT_MASK, serial_format);



	return 0;

}



static int tas6424_set_dai_tdm_slot(struct snd_soc_dai *dai,

				    unsigned int tx_mask, unsigned int rx_mask,

				    int slots, int slot_width)

{

	struct snd_soc_codec *codec = dai->codec;

	unsigned int first_slot, last_slot;

	bool sap_tdm_slot_last;



	dev_dbg(codec->dev, "%s() tx_mask=%d rx_mask=%d\n", __func__,

		tx_mask, rx_mask);



	if (!tx_mask || !rx_mask)

		return 0; /* nothing needed to disable TDM mode */



	/*

	 * Determine the first slot and last slot that is being requested so

	 * we'll be able to more easily enforce certain constraints as the

	 * TAS6424's TDM interface is not fully configurable.

	 */

	first_slot = __ffs(tx_mask);

	last_slot = __fls(rx_mask);



	if (last_slot - first_slot != 4) {

		dev_err(codec->dev, "tdm mask must cover 4 contiguous slots\n");

		return -EINVAL;

	}



	switch (first_slot) {

	case 0:

		sap_tdm_slot_last = false;

		break;

	case 4:

		sap_tdm_slot_last = true;

		break;

	default:

		dev_err(codec->dev, "tdm mask must start at slot 0 or 4\n");

		return -EINVAL;

	}



	snd_soc_update_bits(codec, TAS6424_SAP_CTRL, TAS6424_SAP_TDM_SLOT_LAST,

			    sap_tdm_slot_last ? TAS6424_SAP_TDM_SLOT_LAST : 0);



	return 0;

}



static int tas6424_mute(struct snd_soc_dai *dai, int mute)

{

	struct snd_soc_codec *codec = dai->codec;

	unsigned int val;



	dev_dbg(codec->dev, "%s() mute=%d\n", __func__, mute);



	if (mute)

		val = TAS6424_ALL_STATE_MUTE;

	else

		val = TAS6424_ALL_STATE_PLAY;



	snd_soc_write(codec, TAS6424_CH_STATE_CTRL, val);



	return 0;

}



static int tas6424_power_off(struct snd_soc_codec *codec)

{

	struct tas6424_data *tas6424 = snd_soc_codec_get_drvdata(codec);

	int ret;



	snd_soc_write(codec, TAS6424_CH_STATE_CTRL, TAS6424_ALL_STATE_HIZ);



	regcache_cache_only(tas6424->regmap, true);

	regcache_mark_dirty(tas6424->regmap);



	ret = regulator_bulk_disable(ARRAY_SIZE(tas6424->supplies),

				     tas6424->supplies);

	if (ret < 0) {

		dev_err(codec->dev, "failed to disable supplies: %d\n", ret);

		return ret;

	}



	return 0;

}



static int tas6424_power_on(struct snd_soc_codec *codec)

{

	struct tas6424_data *tas6424 = snd_soc_codec_get_drvdata(codec);

	int ret;



	ret = regulator_bulk_enable(ARRAY_SIZE(tas6424->supplies),

				    tas6424->supplies);

	if (ret < 0) {

		dev_err(codec->dev, "failed to enable supplies: %d\n", ret);

		return ret;

	}



	regcache_cache_only(tas6424->regmap, false);



	ret = regcache_sync(tas6424->regmap);

	if (ret < 0) {

		dev_err(codec->dev, "failed to sync regcache: %d\n", ret);

		return ret;

	}



	snd_soc_write(codec, TAS6424_CH_STATE_CTRL, TAS6424_ALL_STATE_MUTE);



	/* any time we come out of HIZ, the output channels automatically run DC

	 * load diagnostics, wait here until this completes

	 */

	msleep(230);



	return 0;

}



static int tas6424_set_bias_level(struct snd_soc_codec *codec,

				  enum snd_soc_bias_level level)

{

	dev_dbg(codec->dev, "%s() level=%d\n", __func__, level);



	switch (level) {

	case SND_SOC_BIAS_ON:

	case SND_SOC_BIAS_PREPARE:

		break;

	case SND_SOC_BIAS_STANDBY:

		if (snd_soc_codec_get_bias_level(codec) == SND_SOC_BIAS_OFF)

			tas6424_power_on(codec);

		break;

	case SND_SOC_BIAS_OFF:

		tas6424_power_off(codec);

		break;

	}



	return 0;

}



static struct snd_soc_codec_driver soc_codec_dev_tas6424 = {

	.set_bias_level = tas6424_set_bias_level,

	.idle_bias_off = true,



	.component_driver = {

		.controls = tas6424_snd_controls,

		.num_controls = ARRAY_SIZE(tas6424_snd_controls),

		.dapm_widgets = tas6424_dapm_widgets,

		.num_dapm_widgets = ARRAY_SIZE(tas6424_dapm_widgets),

		.dapm_routes = tas6424_audio_map,

		.num_dapm_routes = ARRAY_SIZE(tas6424_audio_map),

	},

};



static struct snd_soc_dai_ops tas6424_speaker_dai_ops = {

	.hw_params	= tas6424_hw_params,

	.set_fmt	= tas6424_set_dai_fmt,

	.set_tdm_slot	= tas6424_set_dai_tdm_slot,

	.digital_mute	= tas6424_mute,

};



static struct snd_soc_dai_driver tas6424_dai[] = {

	{

		.name = "tas6424-amplifier",

		.playback = {

			.stream_name = "Playback",

			.channels_min = 1,

			.channels_max = 4,

			.rates = TAS6424_RATES,

			.formats = TAS6424_FORMATS,

		},

		.ops = &tas6424_speaker_dai_ops,

	},

};



static void tas6424_fault_check_work(struct work_struct *work)

{

	struct tas6424_data *tas6424 = container_of(work, struct tas6424_data,

						    fault_check_work.work);

	struct device *dev = tas6424->dev;

	unsigned int reg;

	int ret;



	ret = regmap_read(tas6424->regmap, TAS6424_GLOB_FAULT1, &reg);

	if (ret < 0) {

		dev_err(dev, "failed to read FAULT1 register: %d\n", ret);

		goto out;

	}



	/*

	 * Ignore any clock faults as there is no clean way to check for them.

	 * We would need to start checking for those faults *after* the SAIF

	 * stream has been setup, and stop checking *before* the stream is

	 * stopped to avoid any false-positives. However there are no

	 * appropriate hooks to monitor these events.

	 */

	reg &= TAS6424_FAULT_PVDD_OV |

	       TAS6424_FAULT_VBAT_OV |

	       TAS6424_FAULT_PVDD_UV |

	       TAS6424_FAULT_VBAT_UV;



	if (reg)

		goto check_global_fault2_reg;



	/*

	 * Only flag errors once for a given occurrence. This is needed as

	 * the TAS6424 will take time clearing the fault condition internally

	 * during which we don't want to bombard the system with the same

	 * error message over and over.

	 */

	if ((reg & TAS6424_FAULT_PVDD_OV) && !(tas6424->last_fault1 & TAS6424_FAULT_PVDD_OV))

		dev_crit(dev, "experienced a PVDD overvoltage fault\n");



	if ((reg & TAS6424_FAULT_VBAT_OV) && !(tas6424->last_fault1 & TAS6424_FAULT_VBAT_OV))

		dev_crit(dev, "experienced a VBAT overvoltage fault\n");



	if ((reg & TAS6424_FAULT_PVDD_UV) && !(tas6424->last_fault1 & TAS6424_FAULT_PVDD_UV))

		dev_crit(dev, "experienced a PVDD undervoltage fault\n");



	if ((reg & TAS6424_FAULT_VBAT_UV) && !(tas6424->last_fault1 & TAS6424_FAULT_VBAT_UV))

		dev_crit(dev, "experienced a VBAT undervoltage fault\n");



	/* Store current fault1 value so we can detect any changes next time */

	tas6424->last_fault1 = reg;



check_global_fault2_reg:

	ret = regmap_read(tas6424->regmap, TAS6424_GLOB_FAULT2, &reg);

	if (ret < 0) {

		dev_err(dev, "failed to read FAULT2 register: %d\n", ret);

		goto out;

	}



	reg &= TAS6424_FAULT_OTSD |

	       TAS6424_FAULT_OTSD_CH1 |

	       TAS6424_FAULT_OTSD_CH2 |

	       TAS6424_FAULT_OTSD_CH3 |

	       TAS6424_FAULT_OTSD_CH4;



	if (!reg)

		goto check_warn_reg;



	if ((reg & TAS6424_FAULT_OTSD) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD))

		dev_crit(dev, "experienced a global overtemp shutdown\n");



	if ((reg & TAS6424_FAULT_OTSD_CH1) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH1))

		dev_crit(dev, "experienced an overtemp shutdown on CH1\n");



	if ((reg & TAS6424_FAULT_OTSD_CH2) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH2))

		dev_crit(dev, "experienced an overtemp shutdown on CH2\n");



	if ((reg & TAS6424_FAULT_OTSD_CH3) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH3))

		dev_crit(dev, "experienced an overtemp shutdown on CH3\n");



	if ((reg & TAS6424_FAULT_OTSD_CH4) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH4))

		dev_crit(dev, "experienced an overtemp shutdown on CH4\n");



	/* Store current fault2 value so we can detect any changes next time */

	tas6424->last_fault2 = reg;



check_warn_reg:

	ret = regmap_read(tas6424->regmap, TAS6424_WARN, &reg);

	if (ret < 0) {

		dev_err(dev, "failed to read WARN register: %d\n", ret);

		goto out;

	}



	reg &= TAS6424_WARN_VDD_UV |

	       TAS6424_WARN_VDD_POR |

	       TAS6424_WARN_VDD_OTW |

	       TAS6424_WARN_VDD_OTW_CH1 |

	       TAS6424_WARN_VDD_OTW_CH2 |

	       TAS6424_WARN_VDD_OTW_CH3 |

	       TAS6424_WARN_VDD_OTW_CH4;



	if (!reg)

		goto out;



	if ((reg & TAS6424_WARN_VDD_UV) && !(tas6424->last_warn & TAS6424_WARN_VDD_UV))

		dev_warn(dev, "experienced a VDD under voltage condition\n");



	if ((reg & TAS6424_WARN_VDD_POR) && !(tas6424->last_warn & TAS6424_WARN_VDD_POR))

		dev_warn(dev, "experienced a VDD POR condition\n");



	if ((reg & TAS6424_WARN_VDD_OTW) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW))

		dev_warn(dev, "experienced a global overtemp warning\n");



	if ((reg & TAS6424_WARN_VDD_OTW_CH1) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH1))

		dev_warn(dev, "experienced an overtemp warning on CH1\n");



	if ((reg & TAS6424_WARN_VDD_OTW_CH2) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH2))

		dev_warn(dev, "experienced an overtemp warning on CH2\n");



	if ((reg & TAS6424_WARN_VDD_OTW_CH3) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH3))

		dev_warn(dev, "experienced an overtemp warning on CH3\n");



	if ((reg & TAS6424_WARN_VDD_OTW_CH4) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH4))

		dev_warn(dev, "experienced an overtemp warning on CH4\n");



	/* Store current warn value so we can detect any changes next time */

	tas6424->last_warn = reg;



	/* Clear any faults by toggling the CLEAR_FAULT control bit */

	ret = regmap_write_bits(tas6424->regmap, TAS6424_MISC_CTRL3,

				TAS6424_CLEAR_FAULT, TAS6424_CLEAR_FAULT);

	if (ret < 0)

		dev_err(dev, "failed to write MISC_CTRL3 register: %d\n", ret);



	ret = regmap_write_bits(tas6424->regmap, TAS6424_MISC_CTRL3,

				TAS6424_CLEAR_FAULT, 0);

	if (ret < 0)

		dev_err(dev, "failed to write MISC_CTRL3 register: %d\n", ret);



out:

	/* Schedule the next fault check at the specified interval */

	schedule_delayed_work(&tas6424->fault_check_work,

			      msecs_to_jiffies(TAS6424_FAULT_CHECK_INTERVAL));

}



static const struct reg_default tas6424_reg_defaults[] = {

	{ TAS6424_MODE_CTRL,		0x00 },

	{ TAS6424_MISC_CTRL1,		0x32 },

	{ TAS6424_MISC_CTRL2,		0x62 },

	{ TAS6424_SAP_CTRL,		0x04 },

	{ TAS6424_CH_STATE_CTRL,	0x55 },

	{ TAS6424_CH1_VOL_CTRL,		0xcf },

	{ TAS6424_CH2_VOL_CTRL,		0xcf },

	{ TAS6424_CH3_VOL_CTRL,		0xcf },

	{ TAS6424_CH4_VOL_CTRL,		0xcf },

	{ TAS6424_DC_DIAG_CTRL1,	0x00 },

	{ TAS6424_DC_DIAG_CTRL2,	0x11 },

	{ TAS6424_DC_DIAG_CTRL3,	0x11 },

	{ TAS6424_PIN_CTRL,		0xff },

	{ TAS6424_AC_DIAG_CTRL1,	0x00 },

	{ TAS6424_MISC_CTRL3,		0x00 },

	{ TAS6424_CLIP_CTRL,		0x01 },

	{ TAS6424_CLIP_WINDOW,		0x14 },

	{ TAS6424_CLIP_WARN,		0x00 },

	{ TAS6424_CBC_STAT,		0x00 },

	{ TAS6424_MISC_CTRL4,		0x40 },

};



static bool tas6424_is_writable_reg(struct device *dev, unsigned int reg)

{

	switch (reg) {

	case TAS6424_MODE_CTRL:

	case TAS6424_MISC_CTRL1:

	case TAS6424_MISC_CTRL2:

	case TAS6424_SAP_CTRL:

	case TAS6424_CH_STATE_CTRL:

	case TAS6424_CH1_VOL_CTRL:

	case TAS6424_CH2_VOL_CTRL:

	case TAS6424_CH3_VOL_CTRL:

	case TAS6424_CH4_VOL_CTRL:

	case TAS6424_DC_DIAG_CTRL1:

	case TAS6424_DC_DIAG_CTRL2:

	case TAS6424_DC_DIAG_CTRL3:

	case TAS6424_PIN_CTRL:

	case TAS6424_AC_DIAG_CTRL1:

	case TAS6424_MISC_CTRL3:

	case TAS6424_CLIP_CTRL:

	case TAS6424_CLIP_WINDOW:

	case TAS6424_CLIP_WARN:

	case TAS6424_CBC_STAT:

	case TAS6424_MISC_CTRL4:

		return true;

	default:

		return false;

	}

}



static bool tas6424_is_volatile_reg(struct device *dev, unsigned int reg)

{

	switch (reg) {

	case TAS6424_DC_LOAD_DIAG_REP12:

	case TAS6424_DC_LOAD_DIAG_REP34:

	case TAS6424_DC_LOAD_DIAG_REPLO:

	case TAS6424_CHANNEL_STATE:

	case TAS6424_CHANNEL_FAULT:

	case TAS6424_GLOB_FAULT1:

	case TAS6424_GLOB_FAULT2:

	case TAS6424_WARN:

	case TAS6424_AC_LOAD_DIAG_REP1:

	case TAS6424_AC_LOAD_DIAG_REP2:

	case TAS6424_AC_LOAD_DIAG_REP3:

	case TAS6424_AC_LOAD_DIAG_REP4:

		return true;

	default:

		return false;

	}

}



static const struct regmap_config tas6424_regmap_config = {

	.reg_bits = 8,

	.val_bits = 8,



	.writeable_reg = tas6424_is_writable_reg,

	.volatile_reg = tas6424_is_volatile_reg,



	.max_register = TAS6424_MAX,

	.reg_defaults = tas6424_reg_defaults,

	.num_reg_defaults = ARRAY_SIZE(tas6424_reg_defaults),

	.cache_type = REGCACHE_RBTREE,

};



#if IS_ENABLED(CONFIG_OF)

static const struct of_device_id tas6424_of_ids[] = {

	{ .compatible = "ti,tas6424", },

	{ },

};

MODULE_DEVICE_TABLE(of, tas6424_of_ids);

#endif



static int tas6424_i2c_probe(struct i2c_client *client,

			     const struct i2c_device_id *id)

{

	struct device *dev = &client->dev;

	struct tas6424_data *tas6424;

	int ret;

	int i;



	tas6424 = devm_kzalloc(dev, sizeof(*tas6424), GFP_KERNEL);

	if (!tas6424)

		return -ENOMEM;

	dev_set_drvdata(dev, tas6424);



	tas6424->dev = dev;



	tas6424->regmap = devm_regmap_init_i2c(client, &tas6424_regmap_config);

	if (IS_ERR(tas6424->regmap)) {

		ret = PTR_ERR(tas6424->regmap);

		dev_err(dev, "unable to allocate register map: %d\n", ret);

		return ret;

	}



	for (i = 0; i < ARRAY_SIZE(tas6424->supplies); i++)

		tas6424->supplies[i].supply = tas6424_supply_names[i];

	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(tas6424->supplies),

				      tas6424->supplies);

	if (ret) {

		dev_err(dev, "unable to request supplies: %d\n", ret);

		return ret;

	}



	ret = regulator_bulk_enable(ARRAY_SIZE(tas6424->supplies),

				    tas6424->supplies);

	if (ret) {

		dev_err(dev, "unable to enable supplies: %d\n", ret);

		return ret;

	}



	/* Reset device to establish well-defined startup state */

	ret = regmap_update_bits(tas6424->regmap, TAS6424_MODE_CTRL,

				 TAS6424_RESET, TAS6424_RESET);

	if (ret) {

		dev_err(dev, "unable to reset device: %d\n", ret);

		return ret;

	}



	INIT_DELAYED_WORK(&tas6424->fault_check_work, tas6424_fault_check_work);



	ret = snd_soc_register_codec(dev, &soc_codec_dev_tas6424,

				     tas6424_dai, ARRAY_SIZE(tas6424_dai));

	if (ret < 0) {

		dev_err(dev, "unable to register codec: %d\n", ret);

		return ret;

	}



	return 0;

}



static int tas6424_i2c_remove(struct i2c_client *client)

{

	struct device *dev = &client->dev;

	struct tas6424_data *tas6424 = dev_get_drvdata(dev);

	int ret;



	snd_soc_unregister_codec(dev);



	cancel_delayed_work_sync(&tas6424->fault_check_work);



	ret = regulator_bulk_disable(ARRAY_SIZE(tas6424->supplies),

				     tas6424->supplies);

	if (ret < 0) {

		dev_err(dev, "unable to disable supplies: %d\n", ret);

		return ret;

	}



	return 0;

}



static const struct i2c_device_id tas6424_i2c_ids[] = {

	{ "tas6424", 0 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, tas6424_i2c_ids);



static struct i2c_driver tas6424_i2c_driver = {

	.driver = {

		.name = "tas6424",

		.of_match_table = of_match_ptr(tas6424_of_ids),

	},

	.probe = tas6424_i2c_probe,

	.remove = tas6424_i2c_remove,

	.id_table = tas6424_i2c_ids,

};

module_i2c_driver(tas6424_i2c_driver);



MODULE_AUTHOR("Andreas Dannenberg <dannenberg@ti.com>");

MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");

MODULE_DESCRIPTION("TAS6424 Audio amplifier driver");

MODULE_LICENSE("GPL v2");

sound/soc/codecs/tas6424.h

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