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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * ALSA SoC SPDIF DIR (Digital Interface Reciever) driver4 *5 * Based on ALSA SoC SPDIF DIT driver6 *7 * This driver is used by controllers which can operate in DIR (SPDI/F) where8 * no codec is needed. This file provides stub codec that can be used9 * in these configurations. SPEAr SPDIF IN Audio controller uses this driver.10 *11 * Author: Vipin Kumar, <vipin.kumar@st.com>12 * Copyright: (C) 2012 ST Microelectronics13 */14 15#include <linux/module.h>16#include <linux/moduleparam.h>17#include <linux/slab.h>18#include <sound/soc.h>19#include <sound/pcm.h>20#include <sound/initval.h>21#include <linux/of.h>22 23static const struct snd_soc_dapm_widget dir_widgets[] = {24 SND_SOC_DAPM_INPUT("spdif-in"),25};26 27static const struct snd_soc_dapm_route dir_routes[] = {28 { "Capture", NULL, "spdif-in" },29};30 31#define STUB_RATES (SNDRV_PCM_RATE_8000_768000 | \32 SNDRV_PCM_RATE_128000)33#define STUB_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \34 SNDRV_PCM_FMTBIT_S20_3LE | \35 SNDRV_PCM_FMTBIT_S24_LE | \36 SNDRV_PCM_FMTBIT_S32_LE | \37 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)38 39static struct snd_soc_component_driver soc_codec_spdif_dir = {40 .dapm_widgets = dir_widgets,41 .num_dapm_widgets = ARRAY_SIZE(dir_widgets),42 .dapm_routes = dir_routes,43 .num_dapm_routes = ARRAY_SIZE(dir_routes),44 .idle_bias_on = 1,45 .use_pmdown_time = 1,46 .endianness = 1,47};48 49static struct snd_soc_dai_driver dir_stub_dai = {50 .name = "dir-hifi",51 .capture = {52 .stream_name = "Capture",53 .channels_min = 1,54 .channels_max = 384,55 .rates = STUB_RATES,56 .formats = STUB_FORMATS,57 },58};59 60static int spdif_dir_probe(struct platform_device *pdev)61{62 return devm_snd_soc_register_component(&pdev->dev,63 &soc_codec_spdif_dir,64 &dir_stub_dai, 1);65}66 67#ifdef CONFIG_OF68static const struct of_device_id spdif_dir_dt_ids[] = {69 { .compatible = "linux,spdif-dir", },70 { }71};72MODULE_DEVICE_TABLE(of, spdif_dir_dt_ids);73#endif74 75static struct platform_driver spdif_dir_driver = {76 .probe = spdif_dir_probe,77 .driver = {78 .name = "spdif-dir",79 .of_match_table = of_match_ptr(spdif_dir_dt_ids),80 },81};82 83module_platform_driver(spdif_dir_driver);84 85MODULE_DESCRIPTION("ASoC SPDIF DIR driver");86MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");87MODULE_LICENSE("GPL");88