[PATCH v3 2/2] ASoC: add support for TAS6424 digital amplifier
From: Michael Stecklein
Date: Tue Jul 18 2017 - 15:20:49 EST
From: Andreas Dannenberg <dannenberg@xxxxxx>
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.
This is an initial version of the driver that does not yet support all
device capabilities.
Signed-off-by: Andreas Dannenberg <dannenberg@xxxxxx>
Signed-off-by: Michael Stecklein <m-stecklein@xxxxxx>
---
sound/soc/codecs/Kconfig | 8 +
sound/soc/codecs/Makefile | 2 +
sound/soc/codecs/tas6424.c | 755 +++++++++++++++++++++++++++++++++++++++++++++
sound/soc/codecs/tas6424.h | 127 ++++++++
4 files changed, 892 insertions(+)
create mode 100644 sound/soc/codecs/tas6424.c
create mode 100644 sound/soc/codecs/tas6424.h
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 6c78b0b..d1fd4a3 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -146,6 +146,7 @@ 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
@@ -865,6 +866,13 @@ 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
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index 1755a54..cb03793 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -153,6 +153,7 @@ 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
@@ -386,6 +387,7 @@ 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
diff --git a/sound/soc/codecs/tas6424.c b/sound/soc/codecs/tas6424.c
new file mode 100644
index 0000000..2dd97e2
--- /dev/null
+++ b/sound/soc/codecs/tas6424.c
@@ -0,0 +1,755 @@
+/*
+ * ALSA SoC Texas Instruments TAS6424 Quad-Channel Audio Amplifier
+ *
+ * Copyright (C)2016 Texas Instruments Incorporated - http://www.ti.com
+ * Andreas Dannenberg <dannenberg@xxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#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 snd_soc_codec *codec;
+ struct regmap *regmap;
+ struct i2c_client *tas6424_client;
+ 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;
+};
+
+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;
+ int ret;
+
+ 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:
+ case 32:
+ break;
+ default:
+ dev_err(codec->dev, "unsupported sample width: %u\n", width);
+ return -EINVAL;
+ }
+
+ ret = snd_soc_update_bits(codec, TAS6424_SAP_CTRL_REG,
+ TAS6424_SAP_RATE_MASK, sap_ctrl);
+ if (ret < 0) {
+ dev_err(codec->dev, "error setting sample rate: %d\n", ret);
+ return ret;
+ }
+
+ 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;
+ int ret;
+
+ dev_dbg(codec->dev, "%s() fmt=0x%0x\n", __func__, fmt);
+
+ if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) {
+ dev_vdbg(codec->dev, "DAI Format master is not found\n");
+ return -EINVAL;
+ }
+
+ switch (fmt & (SND_SOC_DAIFMT_FORMAT_MASK |
+ SND_SOC_DAIFMT_INV_MASK)) {
+ case (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF):
+ /* 1st data bit occur one BCLK cycle after the frame sync */
+ serial_format = TAS6424_SAP_I2S;
+ break;
+ case (SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_NB_NF):
+ /*
+ * DSP_A format means that the first data bit is delayed. For
+ * this, invoke the dedicated DSP mode of the TAS6424. See
+ * device datasheet for additional details on the signal
+ * formatting.
+ */
+ serial_format = TAS6424_SAP_DSP;
+ break;
+ case (SND_SOC_DAIFMT_DSP_B | SND_SOC_DAIFMT_NB_NF):
+ /*
+ * 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 | SND_SOC_DAIFMT_NB_NF):
+ /* No delay after the frame sync */
+ serial_format = TAS6424_SAP_LEFTJ;
+ break;
+ default:
+ dev_vdbg(codec->dev, "DAI Format is not found\n");
+ return -EINVAL;
+ }
+
+ ret = snd_soc_update_bits(codec, TAS6424_SAP_CTRL_REG,
+ TAS6424_SAP_FMT_MASK,
+ serial_format);
+ if (ret < 0) {
+ dev_err(codec->dev, "error setting SAIF format: %d\n", ret);
+ return ret;
+ }
+
+ 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;
+ int ret;
+
+ dev_dbg(codec->dev, "%s() tx_mask=%d rx_mask=%d\n", __func__,
+ tx_mask, rx_mask);
+
+ if (!tx_mask) {
+ dev_err(codec->dev, "tdm mask must not be 0\n");
+ return -EINVAL;
+ }
+
+ /*
+ * 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;
+ }
+
+ /* Configure the TDM slots to process audio from */
+ ret = snd_soc_update_bits(codec, TAS6424_SAP_CTRL_REG,
+ TAS6424_SAP_TDM_SLOT_LAST,
+ sap_tdm_slot_last ? TAS6424_SAP_TDM_SLOT_LAST : 0);
+ if (ret < 0) {
+ dev_err(codec->dev, "error configuring TDM mode: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int tas6424_mute(struct snd_soc_dai *dai, int mute)
+{
+ struct snd_soc_codec *codec = dai->codec;
+ unsigned int val;
+ int ret;
+
+ dev_dbg(codec->dev, "%s() mute=%d\n", __func__, mute);
+
+ if (mute)
+ val = TAS6424_CH1_STATE_MUTE | TAS6424_CH2_STATE_MUTE |
+ TAS6424_CH3_STATE_MUTE | TAS6424_CH4_STATE_MUTE;
+ else
+ val = TAS6424_CH1_STATE_PLAY | TAS6424_CH2_STATE_PLAY |
+ TAS6424_CH3_STATE_PLAY | TAS6424_CH4_STATE_PLAY;
+
+ ret = snd_soc_update_bits(codec, TAS6424_CH_STATE_CTRL_REG, 0xff, val);
+
+ if (ret < 0) {
+ dev_err(codec->dev, "error (un-)muting device: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+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->codec->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_REG,
+ 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_REG,
+ 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 int tas6424_codec_probe(struct snd_soc_codec *codec)
+{
+ struct tas6424_data *tas6424 = snd_soc_codec_get_drvdata(codec);
+ int ret;
+
+ tas6424->codec = codec;
+
+ 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;
+ }
+
+ /* Reset device to establish well-defined startup state */
+ ret = snd_soc_update_bits(codec, TAS6424_MODE_CTRL_REG,
+ TAS6424_RESET, TAS6424_RESET);
+ if (ret < 0)
+ goto error_snd_soc_update_bits;
+
+ /* Set device to Hi-Z mode to minimize current consumption. */
+ ret = snd_soc_update_bits(codec, TAS6424_CH_STATE_CTRL_REG, 0xff,
+ TAS6424_CH1_STATE_HIZ | TAS6424_CH2_STATE_HIZ |
+ TAS6424_CH3_STATE_HIZ | TAS6424_CH4_STATE_HIZ);
+ if (ret < 0)
+ goto error_snd_soc_update_bits;
+
+ INIT_DELAYED_WORK(&tas6424->fault_check_work, tas6424_fault_check_work);
+
+ return 0;
+
+error_snd_soc_update_bits:
+ dev_err(codec->dev, "error configuring device registers: %d\n", ret);
+
+ regulator_bulk_disable(ARRAY_SIZE(tas6424->supplies),
+ tas6424->supplies);
+ return ret;
+}
+
+static int tas6424_codec_remove(struct snd_soc_codec *codec)
+{
+ struct tas6424_data *tas6424 = snd_soc_codec_get_drvdata(codec);
+ int ret;
+
+ cancel_delayed_work_sync(&tas6424->fault_check_work);
+
+ 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;
+};
+
+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;
+}
+
+#ifdef CONFIG_PM
+static int tas6424_suspend(struct snd_soc_codec *codec)
+{
+ struct tas6424_data *tas6424 = snd_soc_codec_get_drvdata(codec);
+ int ret;
+
+ 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;
+}
+
+static int tas6424_resume(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;
+ }
+
+ return 0;
+}
+#else
+#define tas6424_suspend NULL
+#define tas6424_resume NULL
+#endif
+
+static int tas6424_set_bias_level(struct snd_soc_codec *codec,
+ enum snd_soc_bias_level level)
+{
+ int ret;
+
+ dev_dbg(codec->dev, "%s() level=%d\n", __func__, level);
+
+ switch (level) {
+ case SND_SOC_BIAS_ON:
+ case SND_SOC_BIAS_PREPARE:
+ msleep(500);
+ break;
+ case SND_SOC_BIAS_STANDBY:
+ ret = snd_soc_update_bits(codec, TAS6424_CH_STATE_CTRL_REG,
+ 0xff, TAS6424_CH1_STATE_MUTE | TAS6424_CH2_STATE_MUTE |
+ TAS6424_CH3_STATE_MUTE | TAS6424_CH4_STATE_MUTE);
+
+ if (ret < 0) {
+ dev_err(codec->dev, "error resuming device: %d\n", ret);
+ return ret;
+ }
+ break;
+ case SND_SOC_BIAS_OFF:
+ ret = snd_soc_update_bits(codec, TAS6424_CH_STATE_CTRL_REG,
+ 0xff, TAS6424_CH1_STATE_HIZ | TAS6424_CH2_STATE_HIZ |
+ TAS6424_CH3_STATE_HIZ | TAS6424_CH4_STATE_HIZ);
+
+ if (ret < 0) {
+ dev_err(codec->dev, "error suspending device: %d\n", ret);
+ return ret;
+ }
+ break;
+ }
+
+ return 0;
+}
+
+static bool tas6424_is_writable_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case TAS6424_MODE_CTRL_REG:
+ case TAS6424_MISC_CTRL1_REG:
+ case TAS6424_MISC_CTRL2_REG:
+ case TAS6424_SAP_CTRL_REG:
+ case TAS6424_CH_STATE_CTRL_REG:
+ case TAS6424_CH1_VOL_CTRL_REG:
+ case TAS6424_CH2_VOL_CTRL_REG:
+ case TAS6424_CH3_VOL_CTRL_REG:
+ case TAS6424_CH4_VOL_CTRL_REG:
+ case TAS6424_DC_DIAG_CTRL1_REG:
+ case TAS6424_DC_DIAG_CTRL2_REG:
+ case TAS6424_DC_DIAG_CTRL3_REG:
+ case TAS6424_PIN_CTRL_REG:
+ case TAS6424_AC_DIAG_CTRL_REG:
+ case TAS6424_MISC_CTRL3_REG:
+ case TAS6424_CLIP_CTRL_REG:
+ case TAS6424_CLIP_WINDOW_REG:
+ case TAS6424_CLIP_WARN_REG:
+ case TAS6424_CBC_STAT_REG:
+ case TAS6424_MISC_CTRL4_REG:
+ 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_REG:
+ case TAS6424_DC_LOAD_DIAG_REP34_REG:
+ case TAS6424_DC_LOAD_DIAG_REPLO_REG:
+ case TAS6424_CHANNEL_STATE_REG:
+ case TAS6424_CHANNEL_FAULT_REG:
+ case TAS6424_GLOB_FAULT1_REG:
+ case TAS6424_GLOB_FAULT2_REG:
+ case TAS6424_WARN_REG:
+ case TAS6424_AC_LOAD_DIAG_REP1_REG:
+ case TAS6424_AC_LOAD_DIAG_REP2_REG:
+ case TAS6424_AC_LOAD_DIAG_REP3_REG:
+ case TAS6424_AC_LOAD_DIAG_REP4_REG:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static const struct regmap_config tas6424_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+
+ .max_register = TAS6424_MAX_REG,
+ .cache_type = REGCACHE_RBTREE,
+ .writeable_reg = tas6424_is_writable_reg,
+ .volatile_reg = tas6424_is_volatile_reg,
+};
+
+/*
+ * 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_REG, 0, 0xff, 0, dac_tlv),
+ SOC_SINGLE_TLV("Speaker Driver CH2 Playback Volume",
+ TAS6424_CH2_VOL_CTRL_REG, 0, 0xff, 0, dac_tlv),
+ SOC_SINGLE_TLV("Speaker Driver CH3 Playback Volume",
+ TAS6424_CH3_VOL_CTRL_REG, 0, 0xff, 0, dac_tlv),
+ SOC_SINGLE_TLV("Speaker Driver CH4 Playback Volume",
+ TAS6424_CH4_VOL_CTRL_REG, 0, 0xff, 0, dac_tlv),
+};
+
+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 struct snd_soc_codec_driver soc_codec_dev_tas6424 = {
+ .probe = tas6424_codec_probe,
+ .remove = tas6424_codec_remove,
+ .suspend = tas6424_suspend,
+ .resume = tas6424_resume,
+ .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),
+ },
+};
+
+/* PCM rates supported by the TAS6424 driver */
+#define TAS6424_RATES (SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |\
+ SNDRV_PCM_RATE_96000)
+
+/* Formats supported by TAS6424 driver */
+#define TAS6424_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE |\
+ SNDRV_PCM_FMTBIT_S32_LE)
+
+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,
+};
+
+/* TAS6424 DAI structure */
+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 int tas6424_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct device *dev = &client->dev;
+ struct tas6424_data *data;
+ int ret;
+ int i;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->tas6424_client = client;
+ data->regmap = devm_regmap_init_i2c(client, &tas6424_regmap_config);
+ if (IS_ERR(data->regmap)) {
+ ret = PTR_ERR(data->regmap);
+ dev_err(dev, "failed to allocate register map: %d\n", ret);
+ return ret;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(data->supplies); i++)
+ data->supplies[i].supply = tas6424_supply_names[i];
+
+ ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->supplies),
+ data->supplies);
+ if (ret != 0) {
+ dev_err(dev, "failed to request supplies: %d\n", ret);
+ return ret;
+ }
+
+ dev_set_drvdata(dev, data);
+
+ ret = snd_soc_register_codec(&client->dev,
+ &soc_codec_dev_tas6424,
+ tas6424_dai, ARRAY_SIZE(tas6424_dai));
+ if (ret < 0) {
+ dev_err(dev, "failed to register codec: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int tas6424_remove(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+
+ snd_soc_unregister_codec(dev);
+
+ return 0;
+}
+
+static const struct i2c_device_id tas6424_id[] = {
+ { "tas6424", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, tas6424_id);
+
+#if IS_ENABLED(CONFIG_OF)
+static const struct of_device_id tas6424_of_match[] = {
+ { .compatible = "ti,tas6424", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, tas6424_of_match);
+#endif
+
+static struct i2c_driver tas6424_i2c_driver = {
+ .driver = {
+ .name = "tas6424",
+ .of_match_table = of_match_ptr(tas6424_of_match),
+ },
+ .probe = tas6424_probe,
+ .remove = tas6424_remove,
+ .id_table = tas6424_id,
+};
+module_i2c_driver(tas6424_i2c_driver);
+
+MODULE_AUTHOR("Andreas Dannenberg <dannenberg@xxxxxx>");
+MODULE_DESCRIPTION("TAS6424 Audio amplifier driver");
+MODULE_LICENSE("GPL");
diff --git a/sound/soc/codecs/tas6424.h b/sound/soc/codecs/tas6424.h
new file mode 100644
index 0000000..c4bf43a
--- /dev/null
+++ b/sound/soc/codecs/tas6424.h
@@ -0,0 +1,127 @@
+/*
+ * ALSA SoC Texas Instruments TAS6424 Quad-Channel Audio Amplifier
+ *
+ * Copyright (C)2016 Texas Instruments Incorporated - http://www.ti.com
+ * Author: Andreas Dannenberg <dannenberg@xxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#ifndef __TAS6424_H__
+#define __TAS6424_H__
+
+/* Register Address Map */
+#define TAS6424_MODE_CTRL_REG 0x00
+#define TAS6424_MISC_CTRL1_REG 0x01
+#define TAS6424_MISC_CTRL2_REG 0x02
+#define TAS6424_SAP_CTRL_REG 0x03
+#define TAS6424_CH_STATE_CTRL_REG 0x04
+#define TAS6424_CH1_VOL_CTRL_REG 0x05
+#define TAS6424_CH2_VOL_CTRL_REG 0x06
+#define TAS6424_CH3_VOL_CTRL_REG 0x07
+#define TAS6424_CH4_VOL_CTRL_REG 0x08
+#define TAS6424_DC_DIAG_CTRL1_REG 0x09
+#define TAS6424_DC_DIAG_CTRL2_REG 0x0A
+#define TAS6424_DC_DIAG_CTRL3_REG 0x0B
+#define TAS6424_DC_LOAD_DIAG_REP12_REG 0x0C
+#define TAS6424_DC_LOAD_DIAG_REP34_REG 0x0D
+#define TAS6424_DC_LOAD_DIAG_REPLO_REG 0x0E
+#define TAS6424_CHANNEL_STATE_REG 0x0F
+#define TAS6424_CHANNEL_FAULT_REG 0x10
+#define TAS6424_GLOB_FAULT1_REG 0x11
+#define TAS6424_GLOB_FAULT2_REG 0x12
+#define TAS6424_WARN_REG 0x13
+#define TAS6424_PIN_CTRL_REG 0x14
+#define TAS6424_AC_DIAG_CTRL_REG 0x15
+#define TAS6424_AC_LOAD_DIAG_REP1_REG 0x17
+#define TAS6424_AC_LOAD_DIAG_REP2_REG 0x18
+#define TAS6424_AC_LOAD_DIAG_REP3_REG 0x19
+#define TAS6424_AC_LOAD_DIAG_REP4_REG 0x1A
+#define TAS6424_MISC_CTRL3_REG 0x21
+#define TAS6424_CLIP_CTRL_REG 0x22
+#define TAS6424_CLIP_WINDOW_REG 0x23
+#define TAS6424_CLIP_WARN_REG 0x24
+#define TAS6424_CBC_STAT_REG 0x25
+#define TAS6424_MISC_CTRL4_REG 0x26
+#define TAS6424_MAX_REG TAS6424_MISC_CTRL4_REG
+
+/* TAS6424_MODE_CTRL_REG */
+#define TAS6424_RESET BIT(7)
+
+/* TAS6424_SAP_CTRL_REG */
+#define TAS6424_SAP_RATE_44100 (0x0 << 6)
+#define TAS6424_SAP_RATE_48000 (0x1 << 6)
+#define TAS6424_SAP_RATE_96000 (0x2 << 6)
+#define TAS6424_SAP_RATE_MASK GENMASK(7, 6)
+#define TAS6424_SAP_TDM_SLOT_LAST BIT(5)
+#define TAS6424_SAP_TDM_SLOT_SZ_16 BIT(4)
+#define TAS6424_SAP_TDM_SLOT_SWAP BIT(3)
+#define TAS6424_SAP_RIGHTJ_24 (0x0)
+#define TAS6424_SAP_RIGHTJ_20 (0x1)
+#define TAS6424_SAP_RIGHTJ_18 (0x2)
+#define TAS6424_SAP_RIGHTJ_16 (0x3)
+#define TAS6424_SAP_I2S (0x4)
+#define TAS6424_SAP_LEFTJ (0x5)
+#define TAS6424_SAP_DSP (0x6)
+#define TAS6424_SAP_FMT_MASK GENMASK(2, 0)
+
+/* TAS6424_CH_STATE_CTRL_REG */
+#define TAS6424_CH1_STATE_PLAY (0x0 << 6)
+#define TAS6424_CH1_STATE_HIZ (0x1 << 6)
+#define TAS6424_CH1_STATE_MUTE (0x2 << 6)
+#define TAS6424_CH1_STATE_DIAG (0x3 << 6)
+#define TAS6424_CH1_STATE_MASK GENMASK(7, 6)
+#define TAS6424_CH2_STATE_PLAY (0x0 << 4)
+#define TAS6424_CH2_STATE_HIZ (0x1 << 4)
+#define TAS6424_CH2_STATE_MUTE (0x2 << 4)
+#define TAS6424_CH2_STATE_DIAG (0x3 << 4)
+#define TAS6424_CH2_STATE_MASK GENMASK(5, 4)
+#define TAS6424_CH3_STATE_PLAY (0x0 << 2)
+#define TAS6424_CH3_STATE_HIZ (0x1 << 2)
+#define TAS6424_CH3_STATE_MUTE (0x2 << 2)
+#define TAS6424_CH3_STATE_DIAG (0x3 << 2)
+#define TAS6424_CH3_STATE_MASK GENMASK(3, 2)
+#define TAS6424_CH4_STATE_PLAY (0x0)
+#define TAS6424_CH4_STATE_HIZ (0x1)
+#define TAS6424_CH4_STATE_MUTE (0x2)
+#define TAS6424_CH4_STATE_DIAG (0x3)
+#define TAS6424_CH4_STATE_MASK GENMASK(1, 0)
+
+/* TAS6424_GLOB_FAULT1_REG */
+#define TAS6424_FAULT_CLOCK BIT(4)
+#define TAS6424_FAULT_PVDD_OV BIT(3)
+#define TAS6424_FAULT_VBAT_OV BIT(2)
+#define TAS6424_FAULT_PVDD_UV BIT(1)
+#define TAS6424_FAULT_VBAT_UV BIT(0)
+
+/* TAS6424_GLOB_FAULT2_REG */
+#define TAS6424_FAULT_OTSD BIT(4)
+#define TAS6424_FAULT_OTSD_CH1 BIT(3)
+#define TAS6424_FAULT_OTSD_CH2 BIT(2)
+#define TAS6424_FAULT_OTSD_CH3 BIT(1)
+#define TAS6424_FAULT_OTSD_CH4 BIT(0)
+
+/* TAS6424_WARN_REG */
+#define TAS6424_WARN_VDD_UV BIT(6)
+#define TAS6424_WARN_VDD_POR BIT(5)
+#define TAS6424_WARN_VDD_OTW BIT(4)
+#define TAS6424_WARN_VDD_OTW_CH1 BIT(3)
+#define TAS6424_WARN_VDD_OTW_CH2 BIT(2)
+#define TAS6424_WARN_VDD_OTW_CH3 BIT(1)
+#define TAS6424_WARN_VDD_OTW_CH4 BIT(0)
+
+/* TAS6424_MISC_CTRL3_REG */
+#define TAS6424_CLEAR_FAULT BIT(7)
+#define TAS6424_PBTL_CH_SEL BIT(6)
+#define TAS6424_MASK_CBC_WARN BIT(5)
+#define TAS6424_MASK_VDD_UV BIT(4)
+#define TAS6424_OTSD_AUTO_RECOVERY BIT(3)
+
+#endif /* __TAS6424_H__ */
--
2.7.4