1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * ALSA SoC SPDIF DIR (Digital Interface Reciever) driver 4 * 5 * Based on ALSA SoC SPDIF DIT driver 6 * 7 * This driver is used by controllers which can operate in DIR (SPDI/F) where 8 * no codec is needed. This file provides stub codec that can be used 9 * 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 Microelectronics 13 */ 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 23 static const struct snd_soc_dapm_widget dir_widgets[] = { 24 SND_SOC_DAPM_INPUT("spdif-in"), 25 }; 26 27 static const struct snd_soc_dapm_route dir_routes[] = { 28 { "Capture", NULL, "spdif-in" }, 29 }; 30 31 #define STUB_RATES SNDRV_PCM_RATE_8000_192000 32 #define STUB_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \ 33 SNDRV_PCM_FMTBIT_S20_3LE | \ 34 SNDRV_PCM_FMTBIT_S24_LE | \ 35 SNDRV_PCM_FMTBIT_S32_LE | \ 36 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE) 37 38 static struct snd_soc_component_driver soc_codec_spdif_dir = { 39 .dapm_widgets = dir_widgets, 40 .num_dapm_widgets = ARRAY_SIZE(dir_widgets), 41 .dapm_routes = dir_routes, 42 .num_dapm_routes = ARRAY_SIZE(dir_routes), 43 .idle_bias_on = 1, 44 .use_pmdown_time = 1, 45 .endianness = 1, 46 }; 47 48 static struct snd_soc_dai_driver dir_stub_dai = { 49 .name = "dir-hifi", 50 .capture = { 51 .stream_name = "Capture", 52 .channels_min = 1, 53 .channels_max = 384, 54 .rates = STUB_RATES, 55 .formats = STUB_FORMATS, 56 }, 57 }; 58 59 static int spdif_dir_probe(struct platform_device *pdev) 60 { 61 return devm_snd_soc_register_component(&pdev->dev, 62 &soc_codec_spdif_dir, 63 &dir_stub_dai, 1); 64 } 65 66 #ifdef CONFIG_OF 67 static const struct of_device_id spdif_dir_dt_ids[] = { 68 { .compatible = "linux,spdif-dir", }, 69 { } 70 }; 71 MODULE_DEVICE_TABLE(of, spdif_dir_dt_ids); 72 #endif 73 74 static struct platform_driver spdif_dir_driver = { 75 .probe = spdif_dir_probe, 76 .driver = { 77 .name = "spdif-dir", 78 .of_match_table = of_match_ptr(spdif_dir_dt_ids), 79 }, 80 }; 81 82 module_platform_driver(spdif_dir_driver); 83 84 MODULE_DESCRIPTION("ASoC SPDIF DIR driver"); 85 MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>"); 86 MODULE_LICENSE("GPL"); 87