1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * ALSA SoC SPDIF DIT driver 4 * 5 * This driver is used by controllers which can operate in DIT (SPDI/F) where 6 * no codec is needed. This file provides stub codec that can be used 7 * in these configurations. TI DaVinci Audio controller uses this driver. 8 * 9 * Author: Steve Chen, <schen@mvista.com> 10 * Copyright: (C) 2009 MontaVista Software, Inc., <source@mvista.com> 11 * Copyright: (C) 2009 Texas Instruments, India 12 */ 13 14 #include <linux/module.h> 15 #include <linux/moduleparam.h> 16 #include <linux/slab.h> 17 #include <sound/soc.h> 18 #include <sound/pcm.h> 19 #include <sound/initval.h> 20 #include <linux/of.h> 21 22 #define DRV_NAME "spdif-dit" 23 24 #define STUB_RATES SNDRV_PCM_RATE_8000_192000 25 #define STUB_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \ 26 SNDRV_PCM_FMTBIT_S20_3LE | \ 27 SNDRV_PCM_FMTBIT_S24_LE | \ 28 SNDRV_PCM_FMTBIT_S32_LE) 29 30 static const struct snd_soc_dapm_widget dit_widgets[] = { 31 SND_SOC_DAPM_OUTPUT("spdif-out"), 32 }; 33 34 static const struct snd_soc_dapm_route dit_routes[] = { 35 { "spdif-out", NULL, "Playback" }, 36 }; 37 38 static struct snd_soc_component_driver soc_codec_spdif_dit = { 39 .dapm_widgets = dit_widgets, 40 .num_dapm_widgets = ARRAY_SIZE(dit_widgets), 41 .dapm_routes = dit_routes, 42 .num_dapm_routes = ARRAY_SIZE(dit_routes), 43 .idle_bias_on = 1, 44 .use_pmdown_time = 1, 45 .endianness = 1, 46 .non_legacy_dai_naming = 1, 47 }; 48 49 static struct snd_soc_dai_driver dit_stub_dai = { 50 .name = "dit-hifi", 51 .playback = { 52 .stream_name = "Playback", 53 .channels_min = 1, 54 .channels_max = 384, 55 .rates = STUB_RATES, 56 .formats = STUB_FORMATS, 57 }, 58 }; 59 60 static int spdif_dit_probe(struct platform_device *pdev) 61 { 62 return devm_snd_soc_register_component(&pdev->dev, 63 &soc_codec_spdif_dit, 64 &dit_stub_dai, 1); 65 } 66 67 #ifdef CONFIG_OF 68 static const struct of_device_id spdif_dit_dt_ids[] = { 69 { .compatible = "linux,spdif-dit", }, 70 { } 71 }; 72 MODULE_DEVICE_TABLE(of, spdif_dit_dt_ids); 73 #endif 74 75 static struct platform_driver spdif_dit_driver = { 76 .probe = spdif_dit_probe, 77 .driver = { 78 .name = DRV_NAME, 79 .of_match_table = of_match_ptr(spdif_dit_dt_ids), 80 }, 81 }; 82 83 module_platform_driver(spdif_dit_driver); 84 85 MODULE_AUTHOR("Steve Chen <schen@mvista.com>"); 86 MODULE_DESCRIPTION("SPDIF dummy codec driver"); 87 MODULE_LICENSE("GPL"); 88 MODULE_ALIAS("platform:" DRV_NAME); 89