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Subject[PATCH v2 2/3] ASoC: Add codec driver for ST TDA7802
Date
Add an I2C based codec driver for ST TDA7802 amplifier. The amplifier
supports 4 audio channels but can support up to 16 with multiple
devices.

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>
---
Changes since v1:
- Use ALSA kcontrol interface to expose device controls to userland
- Gain
- Channel diagnostic mode
- Impedance efficiency optimiser. I decided against setting this
as a DT property since it seems like something that can be
changed on the fly.
- Add regmap default values
- Channel unmute by default is added in a downstream patch.
- I'm not sure if I should keep this since they're all zero,
although there are other drivers will all-zero reg_defaults.
- I believe the "//" style is used for SPDX headers in normal C source files.
https://lwn.net/Articles/739183/
- Drop the "enable" sysfs device attribute.
- Don't set TDM format using magic numbers.
- Set sample rate using hw_params.
- Remove unecessary defines.
- Use DAPM to handle AMP_ON.
- Cosmetic fixups

sound/soc/codecs/Kconfig | 6 +
sound/soc/codecs/Makefile | 2 +
sound/soc/codecs/tda7802.c | 509 +++++++++++++++++++++++++++++++++++++
3 files changed, 517 insertions(+)
create mode 100644 sound/soc/codecs/tda7802.c

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 9f89a5346299..7e3117eab735 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -182,6 +182,7 @@ 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
@@ -1121,6 +1122,11 @@ 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 5b4bb8cf4325..31dec8930e98 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -194,6 +194,7 @@ 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
@@ -474,6 +475,7 @@ 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..0f82a88bc1a4
--- /dev/null
+++ b/sound/soc/codecs/tda7802.c
@@ -0,0 +1,509 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * tda7802.c -- codec driver for ST TDA7802
+ *
+ * Copyright (C) 2016-2019 Tesla Motors, Inc.
+ */
+
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/string.h>
+#include <sound/control.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+
+#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_DB5 0x15
+
+#define IB2_DIGITAL_MUTE_DISABLED (1 << 2)
+
+#define IB3_SAMPLE_RATE_SHIFT 6
+#define IB3_SAMPLE_RATE_MASK (3 << IB3_SAMPLE_RATE_SHIFT)
+#define IB3_SAMPLE_RATE_44_KHZ (0 << IB3_SAMPLE_RATE_SHIFT)
+#define IB3_SAMPLE_RATE_48_KHZ (1 << IB3_SAMPLE_RATE_SHIFT)
+#define IB3_SAMPLE_RATE_96_KHZ (2 << IB3_SAMPLE_RATE_SHIFT)
+#define IB3_SAMPLE_RATE_192_KHZ (3 << IB3_SAMPLE_RATE_SHIFT)
+#define IB3_FORMAT_SHIFT 3
+#define IB3_FORMAT_MASK (7 << IB3_FORMAT_SHIFT)
+#define IB3_FORMAT_I2S (0 << IB3_FORMAT_SHIFT)
+#define IB3_FORMAT_TDM4 (1 << IB3_FORMAT_SHIFT)
+#define IB3_FORMAT_TDM8_DEV1 (2 << IB3_FORMAT_SHIFT)
+#define IB3_FORMAT_TDM8_DEV2 (3 << IB3_FORMAT_SHIFT)
+#define IB3_FORMAT_TDM16_DEV1 (4 << IB3_FORMAT_SHIFT)
+#define IB3_FORMAT_TDM16_DEV2 (5 << IB3_FORMAT_SHIFT)
+#define IB3_FORMAT_TDM16_DEV3 (6 << IB3_FORMAT_SHIFT)
+#define IB3_FORMAT_TDM16_DEV4 (7 << IB3_FORMAT_SHIFT)
+
+enum tda7802_type {
+ tda7802_base,
+};
+
+struct tda7802_priv {
+ struct i2c_client *i2c;
+ struct regmap *regmap;
+ struct regulator *enable_reg;
+};
+
+static const struct reg_default tda7802_reg[] = {
+ { TDA7802_IB0, 0x0 },
+ { TDA7802_IB1, 0x0 },
+ { TDA7802_IB2, 0x0 },
+ { TDA7802_IB3, 0x0 },
+ { TDA7802_IB4, 0x0 },
+ { TDA7802_IB5, 0x0 },
+};
+
+static bool tda7802_readable_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case TDA7802_IB0 ... TDA7802_IB5:
+ case TDA7802_DB0 ... TDA7802_DB5:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool tda7802_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ 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,
+ .volatile_reg = tda7802_volatile_reg,
+ .writeable_reg = tda7802_writeable_reg,
+
+ .reg_defaults = tda7802_reg,
+ .num_reg_defaults = ARRAY_SIZE(tda7802_reg),
+ .cache_type = REGCACHE_RBTREE,
+};
+
+static int tda7802_digital_mute(struct snd_soc_dai *dai, int mute)
+{
+ const u8 mute_disabled = mute ? 0 : IB2_DIGITAL_MUTE_DISABLED;
+ struct device *dev = dai->dev;
+ int err;
+
+ dev_dbg(dev, "%s mute=%d\n", __func__, mute);
+
+ err = snd_soc_component_update_bits(dai->component, TDA7802_IB2,
+ IB2_DIGITAL_MUTE_DISABLED, mute_disabled);
+ if (err < 0)
+ dev_err(dev, "Cannot mute amp %d\n", err);
+
+ return err;
+}
+
+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 device *dev = dai->dev;
+ u8 tdm_format;
+ int ret;
+
+ dev_dbg(dai->dev, "%s tx %x, rx %x, slots %d, slot_width %d\n",
+ __func__, tx_mask, rx_mask, slots, slot_width);
+
+ switch (slots) {
+ case 4:
+ tdm_format = IB3_FORMAT_TDM4;
+ break;
+ case 8:
+ switch (tx_mask) {
+ case 0x000f:
+ tdm_format = IB3_FORMAT_TDM8_DEV1;
+ break;
+ case 0x00f0:
+ tdm_format = IB3_FORMAT_TDM8_DEV2;
+ break;
+ default:
+ dev_err(dev,
+ "Failed to set tdm fmt, slots %d, tx_mask %x\n",
+ slots, tx_mask);
+ return -ENOTSUPP;
+ }
+ break;
+ case 16:
+ switch (tx_mask) {
+ case 0x000f:
+ tdm_format = IB3_FORMAT_TDM16_DEV1;
+ break;
+ case 0x00f0:
+ tdm_format = IB3_FORMAT_TDM16_DEV2;
+ break;
+ case 0x0f00:
+ tdm_format = IB3_FORMAT_TDM16_DEV3;
+ break;
+ case 0xf000:
+ tdm_format = IB3_FORMAT_TDM16_DEV4;
+ break;
+ default:
+ dev_err(dev,
+ "Failed to set tdm fmt, slots %d, tx_mask %x\n",
+ slots, tx_mask);
+ return -ENOTSUPP;
+ }
+ break;
+ default:
+ dev_err(dev, "Failed to set %d slots, supported: 4, 8, 16\n",
+ slots);
+ return -ENOTSUPP;
+ }
+
+ ret = snd_soc_component_update_bits(dai->component, TDA7802_IB3,
+ IB3_FORMAT_MASK, tdm_format);
+ if (ret < 0) {
+ dev_err(dev, "Failed to write IB3 config %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int tda7802_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ int err;
+ u8 val;
+
+ dev_dbg(dai->dev, "%s rate %d\n", __func__, params_rate(params));
+
+ switch (params_rate(params)) {
+ case 44100:
+ val = IB3_SAMPLE_RATE_44_KHZ;
+ break;
+ case 48000:
+ val = IB3_SAMPLE_RATE_48_KHZ;
+ break;
+ case 96000:
+ val = IB3_SAMPLE_RATE_96_KHZ;
+ break;
+ case 192000:
+ val = IB3_SAMPLE_RATE_192_KHZ;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ err = snd_soc_component_update_bits(dai->component, TDA7802_IB3,
+ IB3_SAMPLE_RATE_MASK, val);
+ if (err < 0)
+ dev_err(dai->dev, "Could not set hw_params, %d\n", err);
+
+ return err;
+}
+
+static const struct snd_soc_dai_ops tda7802_dai_ops = {
+ .digital_mute = tda7802_digital_mute,
+ .hw_params = tda7802_hw_params,
+ .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_44100 | SNDRV_PCM_RATE_48000 |
+ SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_192000,
+ .formats = SNDRV_PCM_FMTBIT_S32_LE,
+ },
+ .ops = &tda7802_dai_ops,
+};
+
+static int tda7802_set_bias_level(struct snd_soc_component *component,
+ enum snd_soc_bias_level level)
+{
+ const struct tda7802_priv *tda7802 =
+ snd_soc_component_get_drvdata(component);
+ struct snd_soc_dapm_context *dapm_context =
+ snd_soc_component_get_dapm(component);
+ const enum snd_soc_bias_level oldlevel =
+ snd_soc_dapm_get_bias_level(dapm_context);
+ int err = 0;
+
+ dev_dbg(component->dev, "%s level %d\n", __func__, level);
+
+ switch (level) {
+ case SND_SOC_BIAS_ON:
+ break;
+ case SND_SOC_BIAS_PREPARE:
+ break;
+ case SND_SOC_BIAS_STANDBY:
+ err = regulator_enable(tda7802->enable_reg);
+ if (err < 0) {
+ dev_err(component->dev, "Could not enable.\n");
+ return err;
+ }
+ dev_dbg(component->dev, "Regulator enabled\n");
+ msleep(ENABLE_DELAY_MS);
+
+ if (oldlevel == SND_SOC_BIAS_OFF) {
+ dev_dbg(component->dev, "Syncing regcache\n");
+ err = regcache_sync(component->regmap);
+ if (err < 0)
+ dev_err(component->dev,
+ "Could not sync regcache, %d\n", err);
+ }
+ break;
+ case SND_SOC_BIAS_OFF:
+ regcache_mark_dirty(component->regmap);
+ err = regulator_disable(tda7802->enable_reg);
+ if (err < 0)
+ dev_err(component->dev, "Could not disable.\n");
+ break;
+ }
+
+ return err;
+}
+
+static const char * const amp_mode_str[] = {
+ "High Efficiency",
+ "Standard Class AB",
+};
+
+static SOC_ENUM_SINGLE_DECL(ch1_amp_mode, TDA7802_IB0, 0, amp_mode_str);
+static SOC_ENUM_SINGLE_DECL(ch2_amp_mode, TDA7802_IB0, 1, amp_mode_str);
+static SOC_ENUM_SINGLE_DECL(ch3_amp_mode, TDA7802_IB0, 2, amp_mode_str);
+static SOC_ENUM_SINGLE_DECL(ch4_amp_mode, TDA7802_IB0, 3, amp_mode_str);
+
+static const char * const zopt_str[] = {
+ "2ohm",
+ "4ohm",
+};
+
+static SOC_ENUM_SINGLE_DECL(zopt_ch24, TDA7802_IB1, 7, zopt_str);
+static SOC_ENUM_SINGLE_DECL(zopt_ch13, TDA7802_IB2, 0, zopt_str);
+
+static const char * const diag_timing_str[] = {
+ "default",
+ "x2",
+ "x4",
+ "x8",
+};
+
+static SOC_ENUM_SINGLE_DECL(diag_timing, TDA7802_IB1, 5, diag_timing_str);
+
+static const char * const mute_time_str[] = {
+ "1.45ms",
+ "5.8ms",
+ "11.6ms",
+ "23.2ms",
+ "46.4ms",
+ "92.8ms",
+ "185.6ms",
+ "371.2ms",
+};
+
+static SOC_ENUM_SINGLE_DECL(mute_time, TDA7802_IB2, 5, mute_time_str);
+
+static const char * const automute_threshold_str[] = {
+ "5.3V",
+ "7.3V",
+};
+
+static SOC_ENUM_SINGLE_DECL(automute_threshold, TDA7802_IB2, 1,
+ automute_threshold_str);
+
+static const char * const ac_diag_threshold_str[] = {
+ "High",
+ "Low",
+};
+
+static SOC_ENUM_SINGLE_DECL(ac_diag_threshold, TDA7802_IB3, 4,
+ ac_diag_threshold_str);
+
+static const char * const ch_diag_mode_str[] = {
+ "Speaker",
+ "Boosted",
+};
+
+static SOC_ENUM_SINGLE_DECL(diag_mode_ch13, TDA7802_IB4, 2, ch_diag_mode_str);
+static SOC_ENUM_SINGLE_DECL(diag_mode_ch24, TDA7802_IB4, 1, ch_diag_mode_str);
+
+static const char * const temp_warn_str[] = {
+ "TW1",
+ "TW2",
+ "TW3",
+ "TW4",
+ "None",
+};
+
+static SOC_ENUM_SINGLE_DECL(temp_warn, TDA7802_IB5, 5, temp_warn_str);
+
+static const char * const clip_detect_str[] = {
+ "2%",
+ "5%",
+ "10%",
+ "None",
+};
+
+static SOC_ENUM_SINGLE_DECL(clip_detect_ch13, TDA7802_IB5, 3, clip_detect_str);
+static SOC_ENUM_SINGLE_DECL(clip_detect_ch24, TDA7802_IB5, 1, clip_detect_str);
+
+static const struct snd_kcontrol_new tda7802_snd_controls[] = {
+ SOC_SINGLE("Channel 4 Tristate", TDA7802_IB0, 7, 1, 0),
+ SOC_SINGLE("Channel 3 Tristate", TDA7802_IB0, 6, 1, 0),
+ SOC_SINGLE("Channel 2 Tristate", TDA7802_IB0, 5, 1, 0),
+ SOC_SINGLE("Channel 1 Tristate", TDA7802_IB0, 4, 1, 0),
+ SOC_ENUM("Channel 4 Amplifier Mode", ch4_amp_mode),
+ SOC_ENUM("Channel 3 Amplifier Mode", ch3_amp_mode),
+ SOC_ENUM("Channel 2 Amplifier Mode", ch2_amp_mode),
+ SOC_ENUM("Channel 1 Amplifier Mode", ch1_amp_mode),
+
+ /* Impedance (Z) efficiency optimiser */
+ SOC_ENUM("Z efficiency opt channels 2 & 4", zopt_ch24),
+ SOC_ENUM("Z efficiency opt channels 1 & 3", zopt_ch13),
+
+ SOC_ENUM("Long diag config timing", diag_timing),
+ SOC_SINGLE_RANGE("Gain channels 1 & 3", TDA7802_IB1, 3, 0, 3, 0),
+ SOC_SINGLE_RANGE("Gain channels 2 & 4", TDA7802_IB1, 1, 0, 3, 0),
+ SOC_SINGLE("Digital gain boost +6db", TDA7802_IB1, 0, 1, 0),
+
+ /* Mute settings */
+ SOC_ENUM("Mute time", mute_time),
+ SOC_SINGLE("Unmute channels 1 & 3", TDA7802_IB2, 4, 1, 0),
+ SOC_SINGLE("Unmute channels 2 & 4", TDA7802_IB2, 3, 1, 0),
+ SOC_ENUM("Automute threshold", automute_threshold),
+
+ SOC_SINGLE("High pass filter enable", TDA7802_IB3, 0, 1, 0),
+
+ /* Interactive diagnostics */
+ SOC_SINGLE("Noise gating func enable", TDA7802_IB4, 7, 1, 1),
+ SOC_SINGLE("CDdiag: short fault", TDA7802_IB4, 6, 1, 1),
+ SOC_SINGLE("CDdiag: offset", TDA7802_IB4, 5, 1, 1),
+ SOC_ENUM("CDdiag: temperature warning", temp_warn),
+ SOC_ENUM("AC diag current threshold", ac_diag_threshold),
+ SOC_SINGLE("AC diag enable", TDA7802_IB4, 3, 1, 0),
+ SOC_ENUM("Diag mode channels 1 & 3", diag_mode_ch13),
+ SOC_ENUM("Diag mode channels 2 & 4", diag_mode_ch24),
+ SOC_SINGLE("Diag mode enable", TDA7802_IB4, 0, 1, 0),
+
+ SOC_ENUM("Clipping detect channels 1 & 3", clip_detect_ch13),
+ SOC_ENUM("Clipping detect channels 2 & 4", clip_detect_ch24),
+};
+
+static const struct snd_soc_dapm_widget tda7802_dapm_widgets[] = {
+ SND_SOC_DAPM_AIF_IN("AIFIN", NULL, 0, SND_SOC_NOPM, 0, 0),
+ SND_SOC_DAPM_DAC("DAC", NULL, TDA7802_IB5, 0, 0),
+ SND_SOC_DAPM_OUTPUT("SPK"),
+};
+
+static const struct snd_soc_dapm_route tda7802_dapm_routes[] = {
+ { "AIFIN", NULL, "Playback" },
+ { "DAC", NULL, "AIFIN" },
+ { "SPK", NULL, "DAC" },
+};
+
+static const struct snd_soc_component_driver tda7802_component_driver = {
+ .set_bias_level = tda7802_set_bias_level,
+ .idle_bias_on = 1,
+ .suspend_bias_off = 1,
+ .controls = tda7802_snd_controls,
+ .num_controls = ARRAY_SIZE(tda7802_snd_controls),
+ .dapm_widgets = tda7802_dapm_widgets,
+ .num_dapm_widgets = ARRAY_SIZE(tda7802_dapm_widgets),
+ .dapm_routes = tda7802_dapm_routes,
+ .num_dapm_routes = ARRAY_SIZE(tda7802_dapm_routes),
+};
+
+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 err;
+
+ 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;
+
+ 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);
+ }
+
+ tda7802->regmap = devm_regmap_init_i2c(tda7802->i2c,
+ &tda7802_regmap_config);
+ if (IS_ERR(tda7802->regmap))
+ return PTR_ERR(tda7802->regmap);
+
+ 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>");
--
2.21.0
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