1 files changed, 87 insertions, 0 deletions
diff --git a/sound/soc/codecs/spdif_receiver.c b/sound/soc/codecs/spdif_receiver.c
new file mode 100644
index 000000000..276db978e
--- /dev/null
+++ b/sound/soc/codecs/spdif_receiver.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ALSA SoC SPDIF DIR (Digital Interface Reciever) driver
+ *
+ * Based on ALSA SoC SPDIF DIT driver
+ *
+ *  This driver is used by controllers which can operate in DIR (SPDI/F) where
+ *  no codec is needed.  This file provides stub codec that can be used
+ *  in these configurations. SPEAr SPDIF IN Audio controller uses this driver.
+ *
+ * Author:      Vipin Kumar,  <vipin.kumar@st.com>
+ * Copyright:   (C) 2012  ST Microelectronics
+ */
+
+#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>
+
+static const struct snd_soc_dapm_widget dir_widgets[] = {
+	SND_SOC_DAPM_INPUT("spdif-in"),
+};
+
+static const struct snd_soc_dapm_route dir_routes[] = {
+	{ "Capture", NULL, "spdif-in" },
+};
+
+#define STUB_RATES	SNDRV_PCM_RATE_8000_192000
+#define STUB_FORMATS	(SNDRV_PCM_FMTBIT_S16_LE | \
+			SNDRV_PCM_FMTBIT_S20_3LE | \
+			SNDRV_PCM_FMTBIT_S24_LE  | \
+			SNDRV_PCM_FMTBIT_S32_LE | \
+			SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
+
+static struct snd_soc_component_driver soc_codec_spdif_dir = {
+	.dapm_widgets		= dir_widgets,
+	.num_dapm_widgets	= ARRAY_SIZE(dir_widgets),
+	.dapm_routes		= dir_routes,
+	.num_dapm_routes	= ARRAY_SIZE(dir_routes),
+	.idle_bias_on		= 1,
+	.use_pmdown_time	= 1,
+	.endianness		= 1,
+	.non_legacy_dai_naming	= 1,
+};
+
+static struct snd_soc_dai_driver dir_stub_dai = {
+	.name		= "dir-hifi",
+	.capture	= {
+		.stream_name	= "Capture",
+		.channels_min	= 1,
+		.channels_max	= 384,
+		.rates		= STUB_RATES,
+		.formats	= STUB_FORMATS,
+	},
+};
+
+static int spdif_dir_probe(struct platform_device *pdev)
+{
+	return devm_snd_soc_register_component(&pdev->dev,
+			&soc_codec_spdif_dir,
+			&dir_stub_dai, 1);
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id spdif_dir_dt_ids[] = {
+	{ .compatible = "linux,spdif-dir", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, spdif_dir_dt_ids);
+#endif
+
+static struct platform_driver spdif_dir_driver = {
+	.probe		= spdif_dir_probe,
+	.driver		= {
+		.name	= "spdif-dir",
+		.of_match_table = of_match_ptr(spdif_dir_dt_ids),
+	},
+};
+
+module_platform_driver(spdif_dir_driver);
+
+MODULE_DESCRIPTION("ASoC SPDIF DIR driver");
+MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
+MODULE_LICENSE("GPL");