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_192000 28 #define STUB_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \ 29 SNDRV_PCM_FMTBIT_S20_3LE | \ 30 SNDRV_PCM_FMTBIT_S24_LE) 31 32 static const struct snd_soc_dapm_widget dit_widgets[] = { 33 SND_SOC_DAPM_OUTPUT("spdif-out"), 34 }; 35 36 static const struct snd_soc_dapm_route dit_routes[] = { 37 { "spdif-out", NULL, "Playback" }, 38 }; 39 40 static struct snd_soc_codec_driver soc_codec_spdif_dit = { 41 .dapm_widgets = dit_widgets, 42 .num_dapm_widgets = ARRAY_SIZE(dit_widgets), 43 .dapm_routes = dit_routes, 44 .num_dapm_routes = ARRAY_SIZE(dit_routes), 45 }; 46 47 static struct snd_soc_dai_driver dit_stub_dai = { 48 .name = "dit-hifi", 49 .playback = { 50 .stream_name = "Playback", 51 .channels_min = 1, 52 .channels_max = 384, 53 .rates = STUB_RATES, 54 .formats = STUB_FORMATS, 55 }, 56 }; 57 58 static int spdif_dit_probe(struct platform_device *pdev) 59 { 60 return snd_soc_register_codec(&pdev->dev, &soc_codec_spdif_dit, 61 &dit_stub_dai, 1); 62 } 63 64 static int spdif_dit_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_dit_dt_ids[] = { 72 { .compatible = "linux,spdif-dit", }, 73 { } 74 }; 75 MODULE_DEVICE_TABLE(of, spdif_dit_dt_ids); 76 #endif 77 78 static struct platform_driver spdif_dit_driver = { 79 .probe = spdif_dit_probe, 80 .remove = spdif_dit_remove, 81 .driver = { 82 .name = DRV_NAME, 83 .of_match_table = of_match_ptr(spdif_dit_dt_ids), 84 }, 85 }; 86 87 module_platform_driver(spdif_dit_driver); 88 89 MODULE_AUTHOR("Steve Chen <schen@mvista.com>"); 90 MODULE_DESCRIPTION("SPDIF dummy codec driver"); 91 MODULE_LICENSE("GPL"); 92 MODULE_ALIAS("platform:" DRV_NAME); 93