| | 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_768000 | \ |
| | 25 | SNDRV_PCM_RATE_128000) |
| | 26 | #define STUB_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \ |
| | 27 | SNDRV_PCM_FMTBIT_S20_3LE | \ |
| | 28 | SNDRV_PCM_FMTBIT_S24_LE | \ |
| | 29 | SNDRV_PCM_FMTBIT_S32_LE) |
| | 30 | |
| | 31 | static const struct snd_soc_dapm_widget dit_widgets[] = { |
| | 32 | SND_SOC_DAPM_OUTPUT("spdif-out"), |
| | 33 | }; |
| | 34 | |
| | 35 | static const struct snd_soc_dapm_route dit_routes[] = { |
| | 36 | { "spdif-out", NULL, "Playback" }, |
| | 37 | }; |
| | 38 | |
| | 39 | static const struct snd_soc_component_driver soc_codec_spdif_dit = { |
| | 40 | .dapm_widgets = dit_widgets, |
| | 41 | .num_dapm_widgets = ARRAY_SIZE(dit_widgets), |
| | 42 | .dapm_routes = dit_routes, |
| | 43 | .num_dapm_routes = ARRAY_SIZE(dit_routes), |
| | 44 | .idle_bias_on = 1, |
| | 45 | .use_pmdown_time = 1, |
| | 46 | .endianness = 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); |
projects / linux-2.6-block.git / blame_incremental