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 #include <linux/of.h> 24 25 #define DRV_NAME "spdif-dit" 26 27 #define STUB_RATES SNDRV_PCM_RATE_8000_96000 28 #define STUB_FORMATS SNDRV_PCM_FMTBIT_S16_LE 29 30 31 static struct snd_soc_codec_driver soc_codec_spdif_dit; 32 33 static struct snd_soc_dai_driver dit_stub_dai = { 34 .name = "dit-hifi", 35 .playback = { 36 .stream_name = "Playback", 37 .channels_min = 1, 38 .channels_max = 384, 39 .rates = STUB_RATES, 40 .formats = STUB_FORMATS, 41 }, 42 }; 43 44 static int spdif_dit_probe(struct platform_device *pdev) 45 { 46 return snd_soc_register_codec(&pdev->dev, &soc_codec_spdif_dit, 47 &dit_stub_dai, 1); 48 } 49 50 static int spdif_dit_remove(struct platform_device *pdev) 51 { 52 snd_soc_unregister_codec(&pdev->dev); 53 return 0; 54 } 55 56 #ifdef CONFIG_OF 57 static const struct of_device_id spdif_dit_dt_ids[] = { 58 { .compatible = "linux,spdif-dit", }, 59 { } 60 }; 61 MODULE_DEVICE_TABLE(of, spdif_dit_dt_ids); 62 #endif 63 64 static struct platform_driver spdif_dit_driver = { 65 .probe = spdif_dit_probe, 66 .remove = spdif_dit_remove, 67 .driver = { 68 .name = DRV_NAME, 69 .owner = THIS_MODULE, 70 .of_match_table = of_match_ptr(spdif_dit_dt_ids), 71 }, 72 }; 73 74 module_platform_driver(spdif_dit_driver); 75 76 MODULE_AUTHOR("Steve Chen <schen@mvista.com>"); 77 MODULE_DESCRIPTION("SPDIF dummy codec driver"); 78 MODULE_LICENSE("GPL"); 79 MODULE_ALIAS("platform:" DRV_NAME); 80