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 SNDRV_PCM_FMTBIT_S32_LE) 32 33 static const struct snd_soc_dapm_widget dit_widgets[] = { 34 SND_SOC_DAPM_OUTPUT("spdif-out"), 35 }; 36 37 static const struct snd_soc_dapm_route dit_routes[] = { 38 { "spdif-out", NULL, "Playback" }, 39 }; 40 41 static struct snd_soc_component_driver soc_codec_spdif_dit = { 42 .dapm_widgets = dit_widgets, 43 .num_dapm_widgets = ARRAY_SIZE(dit_widgets), 44 .dapm_routes = dit_routes, 45 .num_dapm_routes = ARRAY_SIZE(dit_routes), 46 .idle_bias_on = 1, 47 .use_pmdown_time = 1, 48 .endianness = 1, 49 .non_legacy_dai_naming = 1, 50 }; 51 52 static struct snd_soc_dai_driver dit_stub_dai = { 53 .name = "dit-hifi", 54 .playback = { 55 .stream_name = "Playback", 56 .channels_min = 1, 57 .channels_max = 384, 58 .rates = STUB_RATES, 59 .formats = STUB_FORMATS, 60 }, 61 }; 62 63 static int spdif_dit_probe(struct platform_device *pdev) 64 { 65 return devm_snd_soc_register_component(&pdev->dev, 66 &soc_codec_spdif_dit, 67 &dit_stub_dai, 1); 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 .driver = { 81 .name = DRV_NAME, 82 .of_match_table = of_match_ptr(spdif_dit_dt_ids), 83 }, 84 }; 85 86 module_platform_driver(spdif_dit_driver); 87 88 MODULE_AUTHOR("Steve Chen <schen@mvista.com>"); 89 MODULE_DESCRIPTION("SPDIF dummy codec driver"); 90 MODULE_LICENSE("GPL"); 91 MODULE_ALIAS("platform:" DRV_NAME); 92