1 /* 2 * ALSA SoC SPDIF DIR (Digital Interface Reciever) driver 3 * 4 * Based on ALSA SoC SPDIF DIT driver 5 * 6 * This driver is used by controllers which can operate in DIR (SPDI/F) where 7 * no codec is needed. This file provides stub codec that can be used 8 * in these configurations. SPEAr SPDIF IN Audio controller uses this driver. 9 * 10 * Author: Vipin Kumar, <vipin.kumar@st.com> 11 * Copyright: (C) 2012 ST Microelectronics 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License version 2 as 15 * published by the Free Software Foundation. 16 */ 17 18 #include <linux/module.h> 19 #include <linux/moduleparam.h> 20 #include <linux/slab.h> 21 #include <sound/soc.h> 22 #include <sound/pcm.h> 23 #include <sound/initval.h> 24 #include <linux/of.h> 25 26 static const struct snd_soc_dapm_widget dir_widgets[] = { 27 SND_SOC_DAPM_INPUT("spdif-in"), 28 }; 29 30 static const struct snd_soc_dapm_route dir_routes[] = { 31 { "Capture", NULL, "spdif-in" }, 32 }; 33 34 #define STUB_RATES SNDRV_PCM_RATE_8000_192000 35 #define STUB_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \ 36 SNDRV_PCM_FMTBIT_S20_3LE | \ 37 SNDRV_PCM_FMTBIT_S24_LE | \ 38 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE) 39 40 static struct snd_soc_codec_driver soc_codec_spdif_dir = { 41 .dapm_widgets = dir_widgets, 42 .num_dapm_widgets = ARRAY_SIZE(dir_widgets), 43 .dapm_routes = dir_routes, 44 .num_dapm_routes = ARRAY_SIZE(dir_routes), 45 }; 46 47 static struct snd_soc_dai_driver dir_stub_dai = { 48 .name = "dir-hifi", 49 .capture = { 50 .stream_name = "Capture", 51 .channels_min = 1, 52 .channels_max = 384, 53 .rates = STUB_RATES, 54 .formats = STUB_FORMATS, 55 }, 56 }; 57 58 static int spdif_dir_probe(struct platform_device *pdev) 59 { 60 return snd_soc_register_codec(&pdev->dev, &soc_codec_spdif_dir, 61 &dir_stub_dai, 1); 62 } 63 64 static int spdif_dir_remove(struct platform_device *pdev) 65 { 66 snd_soc_unregister_codec(&pdev->dev); 67 return 0; 68 } 69 70 #ifdef CONFIG_OF 71 static const struct of_device_id spdif_dir_dt_ids[] = { 72 { .compatible = "linux,spdif-dir", }, 73 { } 74 }; 75 MODULE_DEVICE_TABLE(of, spdif_dir_dt_ids); 76 #endif 77 78 static struct platform_driver spdif_dir_driver = { 79 .probe = spdif_dir_probe, 80 .remove = spdif_dir_remove, 81 .driver = { 82 .name = "spdif-dir", 83 .of_match_table = of_match_ptr(spdif_dir_dt_ids), 84 }, 85 }; 86 87 module_platform_driver(spdif_dir_driver); 88 89 MODULE_DESCRIPTION("ASoC SPDIF DIR driver"); 90 MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>"); 91 MODULE_LICENSE("GPL"); 92