[PATCH v1 2/2] ASoC: tegra: Support WM8994 by machine driver
From: Svyatoslav Ryhel
Date: Tue Oct 13 2026 - 15:13:59 EST
Add Wolfson Microelectronics WM8994 codec support to the Tegra ASoC
machine driver. The WM8994 codec is found on devices like LG Optimus 2X
(P990/star) and Samsung Captivate Glide (SGH-i927).
Signed-off-by: Svyatoslav Ryhel <clamor95@xxxxxxxxx>
---
sound/soc/tegra/Kconfig | 10 ++
sound/soc/tegra/Makefile | 2 +
sound/soc/tegra/tegra_wm8994.c | 169 +++++++++++++++++++++++++++++++++
3 files changed, 181 insertions(+)
create mode 100644 sound/soc/tegra/tegra_wm8994.c
diff --git a/sound/soc/tegra/Kconfig b/sound/soc/tegra/Kconfig
index fdc954028d622..dd3b2d3d6c4c9 100644
--- a/sound/soc/tegra/Kconfig
+++ b/sound/soc/tegra/Kconfig
@@ -239,6 +239,16 @@ config SND_SOC_TEGRA_WM8962
boards using the WM8962 codec. Currently, the supported boards are
Microsoft Surface RT.
+config SND_SOC_TEGRA_WM8994
+ tristate "SoC Audio support for Tegra boards using a WM8994 codec"
+ depends on I2C && GPIOLIB && MFD_WM8994
+ select SND_SOC_TEGRA_MACHINE_DRV
+ select SND_SOC_WM8994
+ help
+ Say Y or M here if you want to add support for SoC audio on Tegra
+ boards using the WM8994 codec. Currently, the supported boards are
+ LG Optimus X2 P990 and Samsung Captivate Glide (SGH-i927).
+
config SND_SOC_TEGRA_WM9712
tristate "SoC Audio support for Tegra boards using a WM9712 codec"
depends on GPIOLIB
diff --git a/sound/soc/tegra/Makefile b/sound/soc/tegra/Makefile
index 1c18ef6971c09..b8f90149bfa63 100644
--- a/sound/soc/tegra/Makefile
+++ b/sound/soc/tegra/Makefile
@@ -43,10 +43,12 @@ obj-$(CONFIG_SND_SOC_TEGRA210_OPE) += snd-soc-tegra210-ope.o
# Tegra machine Support
snd-soc-tegra-wm8903-y := tegra_wm8903.o
snd-soc-tegra-wm8962-y := tegra_wm8962.o
+snd-soc-tegra-wm8994-y := tegra_wm8994.o
snd-soc-tegra-machine-y := tegra_asoc_machine.o
snd-soc-tegra-audio-graph-card-y := tegra_audio_graph_card.o
obj-$(CONFIG_SND_SOC_TEGRA_WM8903) += snd-soc-tegra-wm8903.o
obj-$(CONFIG_SND_SOC_TEGRA_WM8962) += snd-soc-tegra-wm8962.o
+obj-$(CONFIG_SND_SOC_TEGRA_WM8994) += snd-soc-tegra-wm8994.o
obj-$(CONFIG_SND_SOC_TEGRA_MACHINE_DRV) += snd-soc-tegra-machine.o
obj-$(CONFIG_SND_SOC_TEGRA_AUDIO_GRAPH_CARD) += snd-soc-tegra-audio-graph-card.o
diff --git a/sound/soc/tegra/tegra_wm8994.c b/sound/soc/tegra/tegra_wm8994.c
new file mode 100644
index 0000000000000..950fa6ad388f9
--- /dev/null
+++ b/sound/soc/tegra/tegra_wm8994.c
@@ -0,0 +1,169 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * tegra_wm8994.c - Tegra machine ASoC driver for boards using WM8994 codec.
+ *
+ * Copyright (C) 2026 Svyatoslav Ryhel <clamor95@xxxxxxxxx>
+ *
+ * Based on tegra_wm8994 code copyright/by:
+ *
+ * Author: Sumit Bhattacharya <sumitb@xxxxxxxxxx>
+ * Copyright (C) 2010-2011 - NVIDIA, Inc.
+ *
+ * Based on code copyright/by:
+ *
+ * (c) 2009, 2010 Nvidia Graphics Pvt. Ltd.
+ *
+ * Copyright 2007 Wolfson Microelectronics PLC.
+ * Author: Graeme Gregory
+ * graeme.gregory@xxxxxxxxxxxxxxxx or linux@xxxxxxxxxxxxxxxx
+ */
+
+#include <linux/gpio/consumer.h>
+#include <linux/of.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <sound/core.h>
+#include <sound/jack.h>
+#include <sound/soc.h>
+
+#include "../codecs/wm8994.h"
+
+#include "tegra_asoc_machine.h"
+
+static struct snd_soc_jack_pin tegra_wm8994_mic_jack_pins[] = {
+ { .pin = "Mic Jack", .mask = SND_JACK_MICROPHONE },
+};
+
+static unsigned int tegra_wm8994_mclk_rate(unsigned int srate)
+{
+ unsigned int mclk;
+
+ switch (srate) {
+ case 8000:
+ case 16000:
+ case 24000:
+ case 32000:
+ case 48000:
+ case 64000:
+ case 96000:
+ mclk = 12288000;
+ break;
+ case 11025:
+ case 22050:
+ case 44100:
+ case 88200:
+ mclk = 11289600;
+ break;
+ default:
+ mclk = 12000000;
+ break;
+ }
+
+ return mclk;
+}
+
+static const struct snd_kcontrol_new tegra_wm8994_controls[] = {
+ SOC_DAPM_PIN_SWITCH("Int Spk"),
+ SOC_DAPM_PIN_SWITCH("Internal Mic 1"),
+ SOC_DAPM_PIN_SWITCH("Internal Mic 2"),
+ SOC_DAPM_PIN_SWITCH("Mic Jack"),
+ SOC_DAPM_PIN_SWITCH("Line Out"),
+ SOC_DAPM_PIN_SWITCH("FM Radio"),
+};
+
+static int tegra_wm8994_init(struct snd_soc_pcm_runtime *rtd)
+{
+ struct tegra_machine *machine = snd_soc_card_get_drvdata(rtd->card);
+ int err;
+
+ err = tegra_asoc_machine_init(rtd);
+ if (err)
+ return err;
+
+ if (!machine->gpiod_mic_det && machine->asoc->add_mic_jack) {
+ struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
+ struct snd_soc_component *component = codec_dai->component;
+
+ err = snd_soc_card_jack_new_pins(rtd->card, "Mic Jack",
+ SND_JACK_MICROPHONE,
+ machine->mic_jack,
+ tegra_wm8994_mic_jack_pins,
+ ARRAY_SIZE(tegra_wm8994_mic_jack_pins));
+ if (err) {
+ dev_err(rtd->dev, "Mic Jack creation failed: %d\n", err);
+ return err;
+ }
+
+ wm8994_mic_detect(component, machine->mic_jack, 1);
+ }
+
+ return 0;
+}
+
+static int tegra_wm8994_remove(struct snd_soc_card *card)
+{
+ struct snd_soc_dai_link *link = &card->dai_link[0];
+ struct snd_soc_pcm_runtime *rtd = snd_soc_get_pcm_runtime(card, link);
+ struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
+ struct snd_soc_component *component = codec_dai->component;
+
+ wm8994_mic_detect(component, NULL, 0);
+
+ return 0;
+}
+
+SND_SOC_DAILINK_DEFS(wm8994_hifi,
+ DAILINK_COMP_ARRAY(COMP_EMPTY()),
+ DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "wm8994-aif1")),
+ DAILINK_COMP_ARRAY(COMP_EMPTY()));
+
+static struct snd_soc_dai_link tegra_wm8994_dai = {
+ .name = "WM8994",
+ .stream_name = "WM8994 PCM",
+ .init = tegra_wm8994_init,
+ .dai_fmt = SND_SOC_DAIFMT_I2S |
+ SND_SOC_DAIFMT_NB_NF |
+ SND_SOC_DAIFMT_CBC_CFC,
+ SND_SOC_DAILINK_REG(wm8994_hifi),
+};
+
+static struct snd_soc_card snd_soc_tegra_wm8994 = {
+ .components = "codec:wm8994",
+ .dai_link = &tegra_wm8994_dai,
+ .num_links = 1,
+ .controls = tegra_wm8994_controls,
+ .num_controls = ARRAY_SIZE(tegra_wm8994_controls),
+ .remove = tegra_wm8994_remove,
+ .fully_routed = true,
+};
+
+static const struct tegra_asoc_data tegra_wm8994_data = {
+ .mclk_rate = tegra_wm8994_mclk_rate,
+ .mclk_id = WM8994_SYSCLK_MCLK1,
+ .card = &snd_soc_tegra_wm8994,
+ .add_common_dapm_widgets = true,
+ .add_common_snd_ops = true,
+ .add_mic_jack = true,
+ .add_hp_jack = true,
+};
+
+static const struct of_device_id tegra_wm8994_of_match[] = {
+ { .compatible = "nvidia,tegra-audio-wm8994", .data = &tegra_wm8994_data },
+ { },
+};
+MODULE_DEVICE_TABLE(of, tegra_wm8994_of_match);
+
+static struct platform_driver tegra_wm8994_driver = {
+ .driver = {
+ .name = "tegra-wm8994",
+ .of_match_table = tegra_wm8994_of_match,
+ .pm = &snd_soc_pm_ops,
+ },
+ .probe = tegra_asoc_machine_probe,
+};
+module_platform_driver(tegra_wm8994_driver);
+
+MODULE_AUTHOR("Svyatoslav Ryhel <clamor95@xxxxxxxxx>");
+MODULE_DESCRIPTION("Tegra+WM8994 machine ASoC driver");
+MODULE_LICENSE("GPL");
--
2.53.0