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 }; 47 48 static struct snd_soc_dai_driver dit_stub_dai = { 49 .name = "dit-hifi", 50 .playback = { 51 .stream_name = "Playback", 52 .channels_min = 1, 53 .channels_max = 384, 54 .rates = STUB_RATES, 55 .formats = STUB_FORMATS, 56 }, 57 }; 58 59 static int spdif_dit_probe(struct platform_device *pdev) 60 { 61 return devm_snd_soc_register_component(&pdev->dev, 62 &soc_codec_spdif_dit, 63 &dit_stub_dai, 1); 64 } 65 66 #ifdef CONFIG_OF 67 static const struct of_device_id spdif_dit_dt_ids[] = { 68 { .compatible = "linux,spdif-dit", }, 69 { } 70 }; 71 MODULE_DEVICE_TABLE(of, spdif_dit_dt_ids); 72 #endif 73 74 static struct platform_driver spdif_dit_driver = { 75 .probe = spdif_dit_probe, 76 .driver = { 77 .name = DRV_NAME, 78 .of_match_table = of_match_ptr(spdif_dit_dt_ids), 79 }, 80 }; 81 82 module_platform_driver(spdif_dit_driver); 83 84 MODULE_AUTHOR("Steve Chen <schen@mvista.com>"); 85 MODULE_DESCRIPTION("SPDIF dummy codec driver"); 86 MODULE_LICENSE("GPL"); 87 MODULE_ALIAS("platform:" DRV_NAME); 88