89 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * ALSA SoC SPDIF DIT driver4 *5 * This driver is used by controllers which can operate in DIT (SPDI/F) where6 * no codec is needed. This file provides stub codec that can be used7 * in these configurations. TI DaVinci Audio controller uses this driver.8 *9 * Author: Steve Chen, <schen@mvista.com>10 * Copyright: (C) 2009 MontaVista Software, Inc., <source@mvista.com>11 * Copyright: (C) 2009 Texas Instruments, India12 */13 14#include <linux/module.h>15#include <linux/moduleparam.h>16#include <linux/slab.h>17#include <sound/soc.h>18#include <sound/pcm.h>19#include <sound/initval.h>20#include <linux/of.h>21 22#define DRV_NAME "spdif-dit"23 24#define STUB_RATES (SNDRV_PCM_RATE_8000_768000 | \25 SNDRV_PCM_RATE_128000)26#define STUB_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \27 SNDRV_PCM_FMTBIT_S20_3LE | \28 SNDRV_PCM_FMTBIT_S24_LE | \29 SNDRV_PCM_FMTBIT_S32_LE)30 31static const struct snd_soc_dapm_widget dit_widgets[] = {32 SND_SOC_DAPM_OUTPUT("spdif-out"),33};34 35static const struct snd_soc_dapm_route dit_routes[] = {36 { "spdif-out", NULL, "Playback" },37};38 39static struct snd_soc_component_driver soc_codec_spdif_dit = {40 .dapm_widgets = dit_widgets,41 .num_dapm_widgets = ARRAY_SIZE(dit_widgets),42 .dapm_routes = dit_routes,43 .num_dapm_routes = ARRAY_SIZE(dit_routes),44 .idle_bias_on = 1,45 .use_pmdown_time = 1,46 .endianness = 1,47};48 49static struct snd_soc_dai_driver dit_stub_dai = {50 .name = "dit-hifi",51 .playback = {52 .stream_name = "Playback",53 .channels_min = 1,54 .channels_max = 384,55 .rates = STUB_RATES,56 .formats = STUB_FORMATS,57 },58};59 60static int spdif_dit_probe(struct platform_device *pdev)61{62 return devm_snd_soc_register_component(&pdev->dev,63 &soc_codec_spdif_dit,64 &dit_stub_dai, 1);65}66 67#ifdef CONFIG_OF68static const struct of_device_id spdif_dit_dt_ids[] = {69 { .compatible = "linux,spdif-dit", },70 { }71};72MODULE_DEVICE_TABLE(of, spdif_dit_dt_ids);73#endif74 75static struct platform_driver spdif_dit_driver = {76 .probe = spdif_dit_probe,77 .driver = {78 .name = DRV_NAME,79 .of_match_table = of_match_ptr(spdif_dit_dt_ids),80 },81};82 83module_platform_driver(spdif_dit_driver);84 85MODULE_AUTHOR("Steve Chen <schen@mvista.com>");86MODULE_DESCRIPTION("SPDIF dummy codec driver");87MODULE_LICENSE("GPL");88MODULE_ALIAS("platform:" DRV_NAME);89