1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * ALSA SoC SPDIF DIT driver
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * This driver is used by controllers which can operate in DIT (SPDI/F) where
6*4882a593Smuzhiyun * no codec is needed. This file provides stub codec that can be used
7*4882a593Smuzhiyun * in these configurations. TI DaVinci Audio controller uses this driver.
8*4882a593Smuzhiyun *
9*4882a593Smuzhiyun * Author: Steve Chen, <schen@mvista.com>
10*4882a593Smuzhiyun * Copyright: (C) 2009 MontaVista Software, Inc., <source@mvista.com>
11*4882a593Smuzhiyun * Copyright: (C) 2009 Texas Instruments, India
12*4882a593Smuzhiyun */
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include <linux/module.h>
15*4882a593Smuzhiyun #include <linux/moduleparam.h>
16*4882a593Smuzhiyun #include <linux/slab.h>
17*4882a593Smuzhiyun #include <sound/soc.h>
18*4882a593Smuzhiyun #include <sound/pcm.h>
19*4882a593Smuzhiyun #include <sound/initval.h>
20*4882a593Smuzhiyun #include <linux/of.h>
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun #define DRV_NAME "spdif-dit"
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun #define STUB_RATES SNDRV_PCM_RATE_8000_192000
25*4882a593Smuzhiyun #define STUB_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
26*4882a593Smuzhiyun SNDRV_PCM_FMTBIT_S20_3LE | \
27*4882a593Smuzhiyun SNDRV_PCM_FMTBIT_S24_LE | \
28*4882a593Smuzhiyun SNDRV_PCM_FMTBIT_S32_LE)
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun static const struct snd_soc_dapm_widget dit_widgets[] = {
31*4882a593Smuzhiyun SND_SOC_DAPM_OUTPUT("spdif-out"),
32*4882a593Smuzhiyun };
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun static const struct snd_soc_dapm_route dit_routes[] = {
35*4882a593Smuzhiyun { "spdif-out", NULL, "Playback" },
36*4882a593Smuzhiyun };
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun static struct snd_soc_component_driver soc_codec_spdif_dit = {
39*4882a593Smuzhiyun .dapm_widgets = dit_widgets,
40*4882a593Smuzhiyun .num_dapm_widgets = ARRAY_SIZE(dit_widgets),
41*4882a593Smuzhiyun .dapm_routes = dit_routes,
42*4882a593Smuzhiyun .num_dapm_routes = ARRAY_SIZE(dit_routes),
43*4882a593Smuzhiyun .idle_bias_on = 1,
44*4882a593Smuzhiyun .use_pmdown_time = 1,
45*4882a593Smuzhiyun .endianness = 1,
46*4882a593Smuzhiyun .non_legacy_dai_naming = 1,
47*4882a593Smuzhiyun };
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun static struct snd_soc_dai_driver dit_stub_dai = {
50*4882a593Smuzhiyun .name = "dit-hifi",
51*4882a593Smuzhiyun .playback = {
52*4882a593Smuzhiyun .stream_name = "Playback",
53*4882a593Smuzhiyun .channels_min = 1,
54*4882a593Smuzhiyun .channels_max = 384,
55*4882a593Smuzhiyun .rates = STUB_RATES,
56*4882a593Smuzhiyun .formats = STUB_FORMATS,
57*4882a593Smuzhiyun },
58*4882a593Smuzhiyun };
59*4882a593Smuzhiyun
spdif_dit_probe(struct platform_device * pdev)60*4882a593Smuzhiyun static int spdif_dit_probe(struct platform_device *pdev)
61*4882a593Smuzhiyun {
62*4882a593Smuzhiyun return devm_snd_soc_register_component(&pdev->dev,
63*4882a593Smuzhiyun &soc_codec_spdif_dit,
64*4882a593Smuzhiyun &dit_stub_dai, 1);
65*4882a593Smuzhiyun }
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun #ifdef CONFIG_OF
68*4882a593Smuzhiyun static const struct of_device_id spdif_dit_dt_ids[] = {
69*4882a593Smuzhiyun { .compatible = "linux,spdif-dit", },
70*4882a593Smuzhiyun { }
71*4882a593Smuzhiyun };
72*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, spdif_dit_dt_ids);
73*4882a593Smuzhiyun #endif
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun static struct platform_driver spdif_dit_driver = {
76*4882a593Smuzhiyun .probe = spdif_dit_probe,
77*4882a593Smuzhiyun .driver = {
78*4882a593Smuzhiyun .name = DRV_NAME,
79*4882a593Smuzhiyun .of_match_table = of_match_ptr(spdif_dit_dt_ids),
80*4882a593Smuzhiyun },
81*4882a593Smuzhiyun };
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun module_platform_driver(spdif_dit_driver);
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun MODULE_AUTHOR("Steve Chen <schen@mvista.com>");
86*4882a593Smuzhiyun MODULE_DESCRIPTION("SPDIF dummy codec driver");
87*4882a593Smuzhiyun MODULE_LICENSE("GPL");
88*4882a593Smuzhiyun MODULE_ALIAS("platform:" DRV_NAME);
89