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_IEC958_SUBFRAME_LE) 29 30 static struct snd_soc_codec_driver soc_codec_spdif_dir; 31 32 static struct snd_soc_dai_driver dir_stub_dai = { 33 .name = "dir-hifi", 34 .capture = { 35 .stream_name = "Capture", 36 .channels_min = 1, 37 .channels_max = 384, 38 .rates = STUB_RATES, 39 .formats = STUB_FORMATS, 40 }, 41 }; 42 43 static int spdif_dir_probe(struct platform_device *pdev) 44 { 45 return snd_soc_register_codec(&pdev->dev, &soc_codec_spdif_dir, 46 &dir_stub_dai, 1); 47 } 48 49 static int spdif_dir_remove(struct platform_device *pdev) 50 { 51 snd_soc_unregister_codec(&pdev->dev); 52 return 0; 53 } 54 55 #ifdef CONFIG_OF 56 static const struct of_device_id spdif_dir_dt_ids[] = { 57 { .compatible = "linux,spdif-dir", }, 58 { } 59 }; 60 MODULE_DEVICE_TABLE(of, spdif_dir_dt_ids); 61 #endif 62 63 static struct platform_driver spdif_dir_driver = { 64 .probe = spdif_dir_probe, 65 .remove = spdif_dir_remove, 66 .driver = { 67 .name = "spdif-dir", 68 .owner = THIS_MODULE, 69 .of_match_table = of_match_ptr(spdif_dir_dt_ids), 70 }, 71 }; 72 73 module_platform_driver(spdif_dir_driver); 74 75 MODULE_DESCRIPTION("ASoC SPDIF DIR driver"); 76 MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>"); 77 MODULE_LICENSE("GPL"); 78