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SubjectRe: [PATCH v1 2/4] ASoC: Add codec driver for ST TDA7802
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Date
On 06/11/19 19:49, Thomas Preston wrote:
> Add an I2C based codec driver for ST TDA7802 amplifier. By default, the
> amplifier supports 4 audio channels but can support up to 16 with
> multiple devices. Input is configurable for I2S or TDM.
>
> The unified device properties API is used to get board-specific config from
> device tree / ACPI.
>
> Signed-off-by: Thomas Preston <thomas.preston@codethink.co.uk>
> Cc: Patrick Glaser <pglaser@tesla.com>
> Cc: Rob Duncan <rduncan@tesla.com>
> Cc: Nate Case <ncase@tesla.com>
> ---
> sound/soc/codecs/Kconfig | 6 +
> sound/soc/codecs/Makefile | 2 +
> sound/soc/codecs/tda7802.c | 580 +++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 588 insertions(+)
> create mode 100644 sound/soc/codecs/tda7802.c
>
> diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
> index e730d47ac85b..1d30c2333cb1 100644
> --- a/sound/soc/codecs/Kconfig
> +++ b/sound/soc/codecs/Kconfig
> @@ -176,6 +176,7 @@ config SND_SOC_ALL_CODECS
> select SND_SOC_TAS5720 if I2C
> select SND_SOC_TAS6424 if I2C
> select SND_SOC_TDA7419 if I2C
> + select SND_SOC_TDA7802 if I2C
> select SND_SOC_TFA9879 if I2C
> select SND_SOC_TLV320AIC23_I2C if I2C
> select SND_SOC_TLV320AIC23_SPI if SPI_MASTER
> @@ -1078,6 +1079,11 @@ config SND_SOC_TDA7419
> depends on I2C
> select REGMAP_I2C
>
> +config SND_SOC_TDA7802
> + tristate "ST TDA7802 audio processor"
> + depends on I2C
> + select REGMAP_I2C
> +
> 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 aa7720a7a0aa..fc3fc672bc4b 100644
> --- a/sound/soc/codecs/Makefile
> +++ b/sound/soc/codecs/Makefile
> @@ -187,6 +187,7 @@ snd-soc-tas571x-objs := tas571x.o
> snd-soc-tas5720-objs := tas5720.o
> snd-soc-tas6424-objs := tas6424.o
> snd-soc-tda7419-objs := tda7419.o
> +snd-soc-tda7802-objs := tda7802.o
> snd-soc-tfa9879-objs := tfa9879.o
> snd-soc-tlv320aic23-objs := tlv320aic23.o
> snd-soc-tlv320aic23-i2c-objs := tlv320aic23-i2c.o
> @@ -460,6 +461,7 @@ 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_TDA7419) += snd-soc-tda7419.o
> +obj-$(CONFIG_SND_SOC_TDA7802) += snd-soc-tda7802.o
> obj-$(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/tda7802.c b/sound/soc/codecs/tda7802.c
> new file mode 100644
> index 000000000000..38ca52de85f0
> --- /dev/null
> +++ b/sound/soc/codecs/tda7802.c
> @@ -0,0 +1,580 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * tda7802.c -- codec driver for ST TDA7802
> + *
> + * Copyright (C) 2016-2019 Tesla Motors, Inc.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of the
> + * License, or (at your option) any later version.
> + *
> + */
> +
> +#include <linux/regulator/consumer.h>
> +#include <linux/of_device.h>
> +#include <linux/module.h>
> +#include <linux/i2c.h>
> +#include <linux/delay.h>
> +#include <linux/regmap.h>
> +#include <linux/string.h>
> +#include <sound/soc.h>
> +
> +enum tda7802_type {
> + tda7802_base,
> +};
> +
> +#define I2C_BUS 4
> +
> +#define CHANNELS_PER_AMP 4
> +#define MAX_NUM_AMPS 4
> +
> +#define ENABLE_DELAY_MS 10
> +
> +#define TDA7802_IB0 0x00
> +#define TDA7802_IB1 0x01
> +#define TDA7802_IB2 0x02
> +#define TDA7802_IB3 0x03
> +#define TDA7802_IB4 0x04
> +#define TDA7802_IB5 0x05
> +
> +#define TDA7802_DB0 0x10
> +#define TDA7802_DB1 0x11
> +#define TDA7802_DB2 0x12
> +#define TDA7802_DB3 0x13
> +#define TDA7802_DB4 0x14
> +#define TDA7802_DB5 0x15
> +
> +#define IB0_CH4_TRISTATE_ON (1 << 7)
> +#define IB0_CH3_TRISTATE_ON (1 << 6)
> +#define IB0_CH2_TRISTATE_ON (1 << 5)
> +#define IB0_CH1_TRISTATE_ON (1 << 4)
> +#define IB0_CH4_HIGH_EFF (0 << 3)
> +#define IB0_CH4_CLASS_AB (1 << 3)
> +#define IB0_CH3_HIGH_EFF (0 << 2)
> +#define IB0_CH3_CLASS_AB (1 << 2)
> +#define IB0_CH2_HIGH_EFF (0 << 0)
> +#define IB0_CH2_CLASS_AB (1 << 1)
> +#define IB0_CH1_HIGH_EFF (0 << 0)
> +#define IB0_CH1_CLASS_AB (1 << 0)
> +
> +#define IB1_REAR_IMPEDANCE_2_OHM (0 << 7)
> +#define IB1_REAR_IMPEDANCE_4_OHM (1 << 7)
> +#define IB1_LONG_DIAG_TIMING_x1 (0 << 5)
> +#define IB1_LONG_DIAG_TIMING_x2 (1 << 5)
> +#define IB1_LONG_DIAG_TIMING_x4 (2 << 5)
> +#define IB1_LONG_DIAG_TIMING_x8 (3 << 5)
> +#define IB1_GAIN_CH13_GV1 (0 << 3)
> +#define IB1_GAIN_CH13_GV2 (1 << 3)
> +#define IB1_GAIN_CH13_GV3 (2 << 3)
> +#define IB1_GAIN_CH13_GV4 (3 << 3)
> +#define IB1_GAIN_CH24_GV1 (0 << 1)
> +#define IB1_GAIN_CH24_GV2 (1 << 1)
> +#define IB1_GAIN_CH24_GV3 (2 << 1)
> +#define IB1_GAIN_CH24_GV4 (3 << 1)
> +#define IB1_DIGITAL_GAIN_BOOST (1 << 0)
> +
> +#define IB2_MUTE_TIME_1_MS (0 << 5)
> +#define IB2_MUTE_TIME_5_MS (1 << 5)
> +#define IB2_MUTE_TIME_11_MS (2 << 5)
> +#define IB2_MUTE_TIME_23_MS (3 << 5)
> +#define IB2_MUTE_TIME_46_MS (4 << 5)
> +#define IB2_MUTE_TIME_92_MS (5 << 5)
> +#define IB2_MUTE_TIME_185_MS (6 << 5)
> +#define IB2_MUTE_TIME_371_MS (7 << 5)
> +#define IB2_CH13_UNMUTED (1 << 4)
> +#define IB2_CH24_UNMUTED (1 << 3)
> +#define IB2_DIGITAL_MUTE_DISABLED (1 << 2)
> +#define IB2_AUTOMUTE_THRESHOLD_5V3 (0 << 1)
> +#define IB2_AUTOMUTE_THRESHOLD_7V3 (1 << 1)
> +#define IB2_FRONT_IMPEDANCE_2_OHM (0 << 0)
> +#define IB2_FRONT_IMPEDANCE_4_OHM (1 << 0)
> +
> +#define IB3_SAMPLE_RATE_44_KHZ (0 << 6)
> +#define IB3_SAMPLE_RATE_48_KHZ (1 << 6)
> +#define IB3_SAMPLE_RATE_96_KHZ (2 << 6)
> +#define IB3_SAMPLE_RATE_192_KHZ (3 << 6)
> +#define IB3_FORMAT_I2S (0 << 3)
> +#define IB3_FORMAT_TDM4 (1 << 3)
> +#define IB3_FORMAT_TDM8_DEV1 (2 << 3)
> +#define IB3_FORMAT_TDM8_DEV2 (3 << 3)
> +#define IB3_FORMAT_TDM16_DEV1 (4 << 3)
> +#define IB3_FORMAT_TDM16_DEV2 (5 << 3)
> +#define IB3_FORMAT_TDM16_DEV3 (6 << 3)
> +#define IB3_FORMAT_TDM16_DEV4 (7 << 3)
> +#define IB3_I2S_FRAME_PERIOD_64 (0 << 2)
> +#define IB3_I2S_FRAME_PERIOD_50 (1 << 2)
> +#define IB3_PLL_CLOCK_DITHER_ENABLE (1 << 1)
> +#define IB3_HIGH_PASS_FILTER_ENABLE (1 << 0)

More unused defines - do you want them?

> +
> +static const u8 IB3_FORMAT[4][4] = {
> + /* 1x amp, 4 channels */
> + { IB3_FORMAT_TDM4 },
> + /* 2x amp, 8 channels */
> + { IB3_FORMAT_TDM8_DEV1,
> + IB3_FORMAT_TDM8_DEV2 },
> + /* 3x amp not supported */
> + { },
> + /* 4x amp, 16 channels */
> + { IB3_FORMAT_TDM16_DEV1,
> + IB3_FORMAT_TDM16_DEV2,
> + IB3_FORMAT_TDM16_DEV3,
> + IB3_FORMAT_TDM16_DEV4 },
> +};
> +
> +#define IB4_NOISE_GATE_DISABLE (1 << 7)
> +#define IB4_SHORT_FAULT_ON_CDDIAG_YES (0 << 6)
> +#define IB4_SHORT_FAULT_ON_CDDIAG_NO (1 << 6)
> +#define IB4_OFFSET_ON_CDDIAG_YES (0 << 5)
> +#define IB4_OFFSET_ON_CDDIAG_NO (1 << 5)
> +#define IB4_AC_DIAG_CURRENT_THRESHOLD_HIGH (0 << 4)
> +#define IB4_AC_DIAG_CURRENT_THRESHOLD_LOW (1 << 4)
> +#define IB4_AC_DIAG_ENABLE (1 << 3)
> +#define IB4_CH13_DIAG_MODE_SPEAKER (0 << 2)
> +#define IB4_CH13_DIAG_MODE_BOOSTER (1 << 2)
> +#define IB4_CH24_DIAG_MODE_SPEAKER (0 << 1)
> +#define IB4_CH24_DIAG_MODE_BOOSTER (1 << 1)
> +#define IB4_DIAG_MODE_ENABLE (1 << 0)
> +
> +#define IB5_TEMP_WARNING_ON_CDDIAG_TW1 (0 << 5)
> +#define IB5_TEMP_WARNING_ON_CDDIAG_TW2 (1 << 5)
> +#define IB5_TEMP_WARNING_ON_CDDIAG_TW3 (2 << 5)
> +#define IB5_TEMP_WARNING_ON_CDDIAG_TW4 (3 << 5)
> +#define IB5_TEMP_WARNING_ON_CDDIAG_NONE (4 << 5)
> +#define IB5_CLIP_DETECT_FRONT_1PC (0 << 3)
> +#define IB5_CLIP_DETECT_FRONT_5PC (1 << 3)
> +#define IB5_CLIP_DETECT_FRONT_10PC (2 << 3)
> +#define IB5_CLIP_DETECT_FRONT_NONE (3 << 3)
> +#define IB5_CLIP_DETECT_REAR_1PC (0 << 1)
> +#define IB5_CLIP_DETECT_REAR_5PC (1 << 1)
> +#define IB5_CLIP_DETECT_REAR_10PC (2 << 1)
> +#define IB5_CLIP_DETECT_REAR_NONE (3 << 1)
> +#define IB5_AMPLIFIER_ON (1 << 0)
> +
> +#define DB0_STARTUP_DIAG_STATUS 0x40
> +
> +#define DUMP_NUM_BLOCK 6
> +#define DUMP_NUM_REGS (DUMP_NUM_BLOCK * 2)
> +
> +struct tda7802_priv {
> + struct i2c_client *i2c;
> + struct regmap *regmap;
> + struct regulator *enable_reg;
> + const char *diag_mode_ch13, *diag_mode_ch24;
> + u8 gain_ch13, gain_ch24;
> +};
> +
> +static bool tda7802_readable_reg(struct device *dev, unsigned int reg)
> +{
> + switch (reg) {
> + case TDA7802_IB0 ... TDA7802_IB5:`
Oh, I didn't know it is possible to use such `...` syntax in switch cases. This
is interesting!

> + case TDA7802_DB0 ... TDA7802_DB5:
> + return true;
> + default:
> + return false;
> + }
> +}
> +
> +static bool tda7802_writeable_reg(struct device *dev, unsigned int reg)
> +{
> + switch (reg) {
> + case TDA7802_IB0 ... TDA7802_IB5:
> + return true;
> + default:
> + return false;
> + }
> +}
> +
> +static const struct regmap_config tda7802_regmap_config = {
> + .val_bits = 8,
> + .reg_bits = 8,
> + .max_register = TDA7802_DB5,
> + .use_single_read = 1,
> + .use_single_write = 1,
> +
> + .readable_reg = tda7802_readable_reg,
> + .writeable_reg = tda7802_writeable_reg,

Maybe add default values?

> +};
> +
> +#ifdef DEBUG
> +static int tda7802_dump_regs(struct tda7802_priv *tda7802)
> +{
> + u8 regs[DUMP_NUM_REGS];
> + const char *prefix;
> + int err = 0;
> +
> + prefix = kasprintf(GFP_KERNEL, "%s ", dev_name(&tda7802->i2c->dev));
> + if (!prefix)
> + return -ENOMEM;
> +
> + err = regmap_bulk_read(tda7802->regmap, TDA7802_IB0, &regs[0],
> + DUMP_NUM_BLOCK);
> + if (err < 0)
> + goto cleanup_dump_regs;
> +
> + err = regmap_bulk_read(tda7802->regmap, TDA7802_DB0,
> + &regs[DUMP_NUM_BLOCK], DUMP_NUM_BLOCK);
> + if (err < 0)
> + goto cleanup_dump_regs;
> +
> + print_hex_dump_bytes(prefix, DUMP_PREFIX_NONE, &regs[0], DUMP_NUM_REGS);
> +
> +cleanup_dump_regs:
> + kfree(prefix);
> + return err;
> +}
> +#else
> +static int tda7802_dump_regs(struct tda7802_priv *tda7802)
> +{
> + return 0;
> +}
> +#endif
> +
> +static int tda7802_dai_startup(struct snd_pcm_substream *substream,
> + struct snd_soc_dai *dai)
> +{
> + struct tda7802_priv *tda7802 =
> + snd_soc_component_get_drvdata(dai->component);
> + struct device *dev = dai->dev;
> + u8 data[6] = { 0 };
> + int err;
> +
> + dev_dbg(dev, "%s\n", __func__);
> +
> + /* enable the device */
> + err = regulator_enable(tda7802->enable_reg);
> + if (err < 0) {
> + dev_err(dev, "Could not enable (startup).\n");
> + return err;
> + }
> + msleep(ENABLE_DELAY_MS);
> +
> + /* All channels out of tri-state mode, all channels in Standard Class
> + * AB mode (not High-efficiency)
> + */
> + data[0] = IB0_CH4_CLASS_AB | IB0_CH3_CLASS_AB | IB0_CH2_CLASS_AB |
> + IB0_CH1_CLASS_AB;
> +
> + /* Rear channel load impedance set to 2-Ohm, default diagnostic timing,
> + * GV1 gain on all channels (default), no digital gain increase
> + */
> + data[1] = IB1_REAR_IMPEDANCE_2_OHM | IB1_LONG_DIAG_TIMING_x1;
> + switch (tda7802->gain_ch13) {
> + case 4:
> + data[1] |= IB1_GAIN_CH13_GV4;
> + break;
> + case 3:
> + data[1] |= IB1_GAIN_CH13_GV3;
> + break;
> + case 2:
> + data[1] |= IB1_GAIN_CH13_GV2;
> + break;
> + default:
> + dev_err(dev, "Unknown gain for channel 1,3 %d, setting to 1\n",
> + tda7802->gain_ch13);
> + case 1:
> + data[1] |= IB1_GAIN_CH13_GV1;
> + break;
> + }
> + switch (tda7802->gain_ch24) {
> + case 4:
> + data[1] |= IB1_GAIN_CH24_GV4;
> + break;
> + case 3:
> + data[1] |= IB1_GAIN_CH24_GV3;
> + break;
> + case 2:
> + data[1] |= IB1_GAIN_CH24_GV2;
> + break;
> + default:
> + dev_err(dev, "Unknown gain for channel 2,4 %d, setting to 1\n",
> + tda7802->gain_ch24);
> + case 1:
> + data[1] |= IB1_GAIN_CH24_GV1;
> + break;
> + }
> +
> + /* Mute timing 1.45ms, all channels un-muted, digital mute enabled,
> + * 5.3V undervoltage threshold, front-channel load impedance set to
> + * 2-Ohms
> + */
> + data[2] = IB2_MUTE_TIME_1_MS | IB2_CH13_UNMUTED | IB2_CH24_UNMUTED |
> + IB2_AUTOMUTE_THRESHOLD_5V3 | IB2_FRONT_IMPEDANCE_2_OHM> +
> + /* Don't set IB3 here, we should set it in set_tdm_slot
> + * data[3] = 0;
> + */
> +
> + /* Noise gating enabled, short and offset info on CD-Diag (fault) pin,
> + * diagnostics disabled. Default to speaker.
> + */
> + if (strcmp(tda7802->diag_mode_ch13, "Booster") == 0)
> + data[4] |= IB4_CH13_DIAG_MODE_BOOSTER;
> + else
> + data[4] |= IB4_CH13_DIAG_MODE_SPEAKER;
> +
> + if (strcmp(tda7802->diag_mode_ch24, "Booster") == 0)
> + data[4] |= IB4_CH24_DIAG_MODE_BOOSTER;
> + else
> + data[4] |= IB4_CH24_DIAG_MODE_SPEAKER;
> +
> + /* Temperature warning on diag pin set to TW1 (highest setting), clip
> + * detection set to 1% on all channels
> + */
> + data[5] = IB5_TEMP_WARNING_ON_CDDIAG_TW1 | IB5_CLIP_DETECT_FRONT_1PC |
> + IB5_CLIP_DETECT_REAR_1PC,

Would be nicer to have `;` in the end of the line, instead of `,`

> +
> + err = regmap_bulk_write(tda7802->regmap, TDA7802_IB0, data,
> + ARRAY_SIZE(data));
> + if (err < 0) {
> + dev_err(dev, "Cannot configure amp %d\n", err);
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static void tda7802_dai_shutdown(struct snd_pcm_substream *substream,
> + struct snd_soc_dai *dai)
> +{
> + struct tda7802_priv *tda7802 =
> + snd_soc_component_get_drvdata(dai->component);
> + struct device *dev = dai->dev;
> + int err;
> +
> + dev_dbg(dev, "%s\n", __func__);
> +
> + err = regulator_disable(tda7802->enable_reg);
> + if (err < 0)
> + dev_err(dev, "Could not disable (shutdown)\n");
> +}
> +
> +static int tda7802_digital_mute(struct snd_soc_dai *dai, int mute)
> +{
> + struct device *dev = dai->dev;
> + int err;
> +
> + dev_dbg(dev, "%s mute=%d\n", __func__, mute);
> +
> + if (mute) {
> + /* digital mute */
> + err = snd_soc_component_update_bits(dai->component, TDA7802_IB2,
> + IB2_DIGITAL_MUTE_DISABLED,
> + ~IB2_DIGITAL_MUTE_DISABLED);

In such situations, the last argument is usually `0`, not `~(mask)`

> + if (err < 0)
> + dev_err(dev, "Cannot mute amp %d\n", err);

I think you want to `return err` here, right?

> +
> + /* amp off */
> + err = snd_soc_component_update_bits(dai->component, TDA7802_IB5,
> + IB5_AMPLIFIER_ON, ~IB5_AMPLIFIER_ON);
> + if (err < 0)
> + dev_err(dev, "Cannot amp off %d\n", err);
> +
> + } else {
> + /* amp on */
> + err = snd_soc_component_update_bits(dai->component, TDA7802_IB5,
> + IB5_AMPLIFIER_ON, IB5_AMPLIFIER_ON);
> + if (err < 0)
> + dev_err(dev, "Cannot amp on %d\n", err);
> +
> + /* digital unmute */
> + err = snd_soc_component_update_bits(dai->component, TDA7802_IB2,
> + IB2_DIGITAL_MUTE_DISABLED,
> + IB2_DIGITAL_MUTE_DISABLED);
> + if (err < 0)
> + dev_err(dev, "Cannot unmute amp %d\n", err);
> + }
> +
> + return 0;
> +}
> +
> +static int tda7802_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask,
> + unsigned int rx_mask, int slots, int slot_width)
> +{
> + struct tda7802_priv *tda7802 =
> + snd_soc_component_get_drvdata(dai->component);
> + int width_index, slot_index, ret;
> + struct device *dev = dai->dev;
> + u8 data;
> +
> + if (!(slots == 4 || slots == 8 || slots == 16)) {
> + dev_err(dev, "Failed to set %d slots, supported: 4, 8, 16\n",
> + slots);
> + return -ENOTSUPP;
> + }
> + width_index = (slots / 4) - 1;
> +
> + switch (tx_mask) {
> + case 0x000f:
> + slot_index = 0;
> + break;
> + case 0x00f0:
> + slot_index = 1;
> + break;
> + case 0x0f00:
> + slot_index = 2;
> + break;
> + case 0xf000:
> + slot_index = 3;
> + break;
> + default:
> + /* must be contigious nibble */
> + dev_err(dev, "Failed to set tx_mask %08x\n", tx_mask);
> + return -ENOTSUPP;
> + }
> +
> + /* 48kHz sample rate, TDM configuration, 64-bit I2S frame period, PLL
> + * clock dither disabled, high-pass filter enabled (blocks DC output)
> + */
> + data = IB3_SAMPLE_RATE_48_KHZ | IB3_FORMAT[width_index][slot_index] |
> + IB3_I2S_FRAME_PERIOD_64 | IB3_HIGH_PASS_FILTER_ENABLE;
> + ret = snd_soc_component_write(dai->component, TDA7802_IB3, data);
> + if (ret < 0) {
> + dev_err(dev, "Failed to write IB3 config %d\n", ret);
> + return ret;
> + }
> +
> + tda7802_dump_regs(tda7802);
> +
> + return 0;
> +}
> +
> +static const struct snd_soc_dai_ops tda7802_dai_ops = {
> + .startup = tda7802_dai_startup,
> + .shutdown = tda7802_dai_shutdown,
> + .digital_mute = tda7802_digital_mute,
> + .set_tdm_slot = tda7802_set_tdm_slot,
> +};
> +
> +static struct snd_soc_dai_driver tda7802_dai_driver = {
> + .name = "tda7802",
> + .playback = {
> + .stream_name = "Playback",
> + .channels_min = 4,
> + .channels_max = 4,
> + .rates = SNDRV_PCM_RATE_48000,
> + .formats = SNDRV_PCM_FMTBIT_S32_LE,
> + },
> + .ops = &tda7802_dai_ops,
> +};
> +
> +/* read device tree or ACPI properties from device */
> +static int tda7802_read_properties(struct tda7802_priv *tda7802)
> +{
> + struct device *dev = &tda7802->i2c->dev;
> + int err = 0;
> +
> + tda7802->enable_reg = devm_regulator_get(dev, "enable");
> + if (IS_ERR(tda7802->enable_reg)) {
> + dev_err(dev, "Failed to get enable regulator\n");
> + return PTR_ERR(tda7802->enable_reg);
> + }
> +
> + err = device_property_read_u8(dev, "st,gain-ch13", &tda7802->gain_ch13);
> + if (err < 0)
> + dev_err(dev, "Failed to read gain, channel 1,3 %d\n", err);
> +
> + err = device_property_read_u8(dev, "st,gain-ch24", &tda7802->gain_ch24);
> + if (err < 0)
> + dev_err(dev, "Failed to read gain, channel 2,4 %d\n", err);
> +
> + err = device_property_read_string(dev, "st,diagnostic-mode-ch13",
> + &tda7802->diag_mode_ch13);

Why is diagnostic mode in dtb? Looks like it should be configurable on the
run-time, so a module parameter would be a more proper place for it

> + if (err < 0)
> + dev_err(dev, "Failed to read diagnostic mode, channel 1,3 %d\n",
> + err);
> +
> + err = device_property_read_string(dev, "st,diagnostic-mode-ch24",
> + &tda7802->diag_mode_ch24);
> + if (err < 0)
> + dev_err(dev, "Failed to read diagnostic mode, channel 2,4 %d\n",
> + err);
> +
> + return err;
> +}
> +
> +static const struct snd_soc_component_driver tda7802_component_driver;
> +
> +static int tda7802_i2c_probe(struct i2c_client *i2c,
> + const struct i2c_device_id *id)
> +{
> + struct device *dev = &i2c->dev;
> + struct tda7802_priv *tda7802;
> + int status, err, err2;
> +
> + dev_dbg(dev, "%s addr=0x%02hx, id %p\n", __func__, i2c->addr, id);
> +
> + tda7802 = devm_kmalloc(dev, sizeof(*tda7802), GFP_KERNEL);
> + if (!tda7802)
> + return -ENOMEM;
> +
> + i2c_set_clientdata(i2c, tda7802);
> + tda7802->i2c = i2c;
> +
> + err = tda7802_read_properties(tda7802);
> + if (err < 0)
> + return err;
> +
> + tda7802->regmap = devm_regmap_init_i2c(tda7802->i2c,
> + &tda7802_regmap_config);
> + if (IS_ERR(tda7802->regmap))
> + return PTR_ERR(tda7802->regmap);
> +
> + /* Enable and verify the connection */
> + err = regulator_enable(tda7802->enable_reg);
> + if (err < 0) {
> + dev_err(dev, "Failed to enable (init)\n");
> + return err;
> + }
> + msleep(ENABLE_DELAY_MS);
> +
> + err = regmap_read(tda7802->regmap, TDA7802_DB1, &status);
> +
> + /* always disable the regulator, even if the read fails */
> + err2 = regulator_disable(tda7802->enable_reg);
> + if (err2 < 0) {
> + dev_err(dev, "Failed to disable (init)\n");
> + return err2;
> + }
> + /* now check for regmap_read errors */
> + if (err < 0) {
> + dev_err(dev, "Could not read from device\n");
> + return -ENODEV;
> + }
> +
> + err = devm_snd_soc_register_component(dev, &tda7802_component_driver,
> + &tda7802_dai_driver, 1);
> + if (err < 0)
> + dev_err(dev, "Failed to register codec: %d\n", err);
> + return err;
> +}
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id tda7802_of_match[] = {
> + { .compatible = "st,tda7802" },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, tda7802_of_match);
> +#endif
> +
> +static const struct i2c_device_id tda7802_i2c_id[] = {
> + { "tda7802", tda7802_base },
> + {},
> +};
> +MODULE_DEVICE_TABLE(i2c, tda7802_i2c_id);
> +
> +static struct i2c_driver tda7802_i2c_driver = {
> + .driver = {
> + .name = "tda7802-codec",
> + .owner = THIS_MODULE,
> + .of_match_table = of_match_ptr(tda7802_of_match),
> + },
> + .probe = tda7802_i2c_probe,
> + .id_table = tda7802_i2c_id,
> +};
> +module_i2c_driver(tda7802_i2c_driver);
> +
> +MODULE_DESCRIPTION("ASoC ST TDA7802 driver");
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Rob Duncan <rduncan@tesla.com>");
> +MODULE_AUTHOR("Thomas Preston <thomas.preston@codethink.co.uk>");
>

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