1/* 2 * ALSA SoC SPDIF DIT driver 3 * 4 * This driver is used by controllers which can operate in DIT (SPDI/F) where 5 * no codec is needed. This file provides stub codec that can be used 6 * in these configurations. TI DaVinci Audio controller uses this driver. 7 * 8 * Author: Steve Chen, <schen@mvista.com> 9 * Copyright: (C) 2009 MontaVista Software, Inc., <source@mvista.com> 10 * Copyright: (C) 2009 Texas Instruments, India 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License version 2 as 14 * published by the Free Software Foundation. 15 */ 16 17#include <linux/module.h> 18#include <linux/moduleparam.h> 19#include <linux/slab.h> 20#include <sound/soc.h> 21#include <sound/pcm.h> 22#include <sound/initval.h> 23 24#include "spdif_transciever.h" 25 26MODULE_LICENSE("GPL"); 27 28#define STUB_RATES SNDRV_PCM_RATE_8000_96000 29#define STUB_FORMATS SNDRV_PCM_FMTBIT_S16_LE 30 31static struct snd_soc_codec *spdif_dit_codec; 32 33static int spdif_dit_codec_probe(struct platform_device *pdev) 34{ 35 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 36 struct snd_soc_codec *codec; 37 int ret; 38 39 if (spdif_dit_codec == NULL) { 40 dev_err(&pdev->dev, "Codec device not registered\n"); 41 return -ENODEV; 42 } 43 44 socdev->card->codec = spdif_dit_codec; 45 codec = spdif_dit_codec; 46 47 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); 48 if (ret < 0) { 49 dev_err(codec->dev, "failed to create pcms: %d\n", ret); 50 goto err_create_pcms; 51 } 52 53 return 0; 54 55err_create_pcms: 56 return ret; 57} 58 59static int spdif_dit_codec_remove(struct platform_device *pdev) 60{ 61 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 62 63 snd_soc_free_pcms(socdev); 64 65 return 0; 66} 67 68struct snd_soc_codec_device soc_codec_dev_spdif_dit = { 69 .probe = spdif_dit_codec_probe, 70 .remove = spdif_dit_codec_remove, 71}; EXPORT_SYMBOL_GPL(soc_codec_dev_spdif_dit); 72 73struct snd_soc_dai dit_stub_dai = { 74 .name = "DIT", 75 .playback = { 76 .stream_name = "Playback", 77 .channels_min = 1, 78 .channels_max = 384, 79 .rates = STUB_RATES, 80 .formats = STUB_FORMATS, 81 }, 82}; 83EXPORT_SYMBOL_GPL(dit_stub_dai); 84 85static int spdif_dit_probe(struct platform_device *pdev) 86{ 87 struct snd_soc_codec *codec; 88 int ret; 89 90 if (spdif_dit_codec) { 91 dev_err(&pdev->dev, "Another Codec is registered\n"); 92 ret = -EINVAL; 93 goto err_reg_codec; 94 } 95 96 codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL); 97 if (codec == NULL) 98 return -ENOMEM; 99 100 codec->dev = &pdev->dev; 101 102 mutex_init(&codec->mutex); 103 104 INIT_LIST_HEAD(&codec->dapm_widgets); 105 INIT_LIST_HEAD(&codec->dapm_paths); 106 107 codec->name = "spdif-dit"; 108 codec->owner = THIS_MODULE; 109 codec->dai = &dit_stub_dai; 110 codec->num_dai = 1; 111 112 spdif_dit_codec = codec; 113 114 ret = snd_soc_register_codec(codec); 115 if (ret < 0) { 116 dev_err(codec->dev, "Failed to register codec: %d\n", ret); 117 goto err_reg_codec; 118 } 119 120 dit_stub_dai.dev = &pdev->dev; 121 ret = snd_soc_register_dai(&dit_stub_dai); 122 if (ret < 0) { 123 dev_err(codec->dev, "Failed to register dai: %d\n", ret); 124 goto err_reg_dai; 125 } 126 127 return 0; 128 129err_reg_dai: 130 snd_soc_unregister_codec(codec); 131err_reg_codec: 132 kfree(spdif_dit_codec); 133 return ret; 134} 135 136static int spdif_dit_remove(struct platform_device *pdev) 137{ 138 snd_soc_unregister_dai(&dit_stub_dai); 139 snd_soc_unregister_codec(spdif_dit_codec); 140 kfree(spdif_dit_codec); 141 spdif_dit_codec = NULL; 142 return 0; 143} 144 145static struct platform_driver spdif_dit_driver = { 146 .probe = spdif_dit_probe, 147 .remove = spdif_dit_remove, 148 .driver = { 149 .name = "spdif-dit", 150 .owner = THIS_MODULE, 151 }, 152}; 153 154static int __init dit_modinit(void) 155{ 156 return platform_driver_register(&spdif_dit_driver); 157} 158 159static void __exit dit_exit(void) 160{ 161 platform_driver_unregister(&spdif_dit_driver); 162} 163 164module_init(dit_modinit); 165module_exit(dit_exit); 166