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 #define STUB_RATES SNDRV_PCM_RATE_8000_192000 27 #define STUB_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \ 28 SNDRV_PCM_FMTBIT_S20_3LE | \ 29 SNDRV_PCM_FMTBIT_S24_LE | \ 30 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE) 31 32 static struct snd_soc_codec_driver soc_codec_spdif_dir; 33 34 static struct snd_soc_dai_driver dir_stub_dai = { 35 .name = "dir-hifi", 36 .capture = { 37 .stream_name = "Capture", 38 .channels_min = 1, 39 .channels_max = 384, 40 .rates = STUB_RATES, 41 .formats = STUB_FORMATS, 42 }, 43 }; 44 45 static int spdif_dir_probe(struct platform_device *pdev) 46 { 47 return snd_soc_register_codec(&pdev->dev, &soc_codec_spdif_dir, 48 &dir_stub_dai, 1); 49 } 50 51 static int spdif_dir_remove(struct platform_device *pdev) 52 { 53 snd_soc_unregister_codec(&pdev->dev); 54 return 0; 55 } 56 57 #ifdef CONFIG_OF 58 static const struct of_device_id spdif_dir_dt_ids[] = { 59 { .compatible = "linux,spdif-dir", }, 60 { } 61 }; 62 MODULE_DEVICE_TABLE(of, spdif_dir_dt_ids); 63 #endif 64 65 static struct platform_driver spdif_dir_driver = { 66 .probe = spdif_dir_probe, 67 .remove = spdif_dir_remove, 68 .driver = { 69 .name = "spdif-dir", 70 .owner = THIS_MODULE, 71 .of_match_table = of_match_ptr(spdif_dir_dt_ids), 72 }, 73 }; 74 75 module_platform_driver(spdif_dir_driver); 76 77 MODULE_DESCRIPTION("ASoC SPDIF DIR driver"); 78 MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>"); 79 MODULE_LICENSE("GPL"); 80