1 files changed, 81 insertions, 0 deletions
diff --git a/sound/soc/starfive/pwmdac-transmitter.c b/sound/soc/starfive/pwmdac-transmitter.c
new file mode 100644
index 000000000000..46c2e5041ffb
--- /dev/null
+++ b/sound/soc/starfive/pwmdac-transmitter.c
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021 StarFive Technology Co., Ltd.
+ */
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/slab.h>
+#include <sound/soc.h>
+#include <sound/pcm.h>
+#include <sound/initval.h>
+#include <linux/of.h>
+
+#define DRV_NAME "pwmdac-dit"
+
+#define STUB_RATES	SNDRV_PCM_RATE_8000_192000
+#define STUB_FORMATS	(SNDRV_PCM_FMTBIT_S8|\
+			SNDRV_PCM_FMTBIT_U8      |\
+			SNDRV_PCM_FMTBIT_S16_LE  | \
+			SNDRV_PCM_FMTBIT_S20_3LE | \
+			SNDRV_PCM_FMTBIT_S24_LE  | \
+			SNDRV_PCM_FMTBIT_S32_LE)
+
+static const struct snd_soc_dapm_widget dit_widgets[] = {
+	SND_SOC_DAPM_OUTPUT("pwmdac-out"),
+};
+
+static const struct snd_soc_dapm_route dit_routes[] = {
+	{ "pwmdac-out", NULL, "Playback" },
+};
+
+static struct snd_soc_component_driver soc_codec_pwmdac_dit = {
+	.dapm_widgets		= dit_widgets,
+	.num_dapm_widgets	= ARRAY_SIZE(dit_widgets),
+	.dapm_routes		= dit_routes,
+	.num_dapm_routes	= ARRAY_SIZE(dit_routes),
+	.idle_bias_on		= 1,
+	.use_pmdown_time	= 1,
+	.endianness		= 1,
+};
+
+static struct snd_soc_dai_driver dit_stub_dai = {
+	.name		= "pwmdac-dit-hifi",
+	.playback 	= {
+		.stream_name	= "Playback",
+		.channels_min	= 1,
+		.channels_max	= 384,
+		.rates		= STUB_RATES,
+		.formats	= STUB_FORMATS,
+	},
+};
+
+static int pwmdac_dit_probe(struct platform_device *pdev)
+{
+
+	return devm_snd_soc_register_component(&pdev->dev,
+			&soc_codec_pwmdac_dit,
+			&dit_stub_dai, 1);
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id pwmdac_dit_dt_ids[] = {
+	{ .compatible = "linux,pwmdac-dit", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, pwmdac_dit_dt_ids);
+#endif
+
+static struct platform_driver pwmdac_dit_driver = {
+	.probe		= pwmdac_dit_probe,
+	.driver		= {
+		.name	= DRV_NAME,
+		.of_match_table = of_match_ptr(pwmdac_dit_dt_ids),
+	},
+};
+
+module_platform_driver(pwmdac_dit_driver);
+
+MODULE_AUTHOR("jenny.zhang <jenny.zhang@starfivetech.com>");
+MODULE_DESCRIPTION("pwmdac dummy codec driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform: starfive-pwmdac dummy codec");