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// 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, }; 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"); |