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(dev: &pdev->dev, |
62 | component_driver: &soc_codec_spdif_dit, |
63 | dai_drv: &dit_stub_dai, num_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 | |