1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * ALSA SoC SPDIF DIR (Digital Interface Reciever) driver
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Based on ALSA SoC SPDIF DIT driver
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * This driver is used by controllers which can operate in DIR (SPDI/F) where
8*4882a593Smuzhiyun * no codec is needed. This file provides stub codec that can be used
9*4882a593Smuzhiyun * in these configurations. SPEAr SPDIF IN Audio controller uses this driver.
10*4882a593Smuzhiyun *
11*4882a593Smuzhiyun * Author: Vipin Kumar, <vipin.kumar@st.com>
12*4882a593Smuzhiyun * Copyright: (C) 2012 ST Microelectronics
13*4882a593Smuzhiyun */
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun #include <linux/module.h>
16*4882a593Smuzhiyun #include <linux/moduleparam.h>
17*4882a593Smuzhiyun #include <linux/slab.h>
18*4882a593Smuzhiyun #include <sound/soc.h>
19*4882a593Smuzhiyun #include <sound/pcm.h>
20*4882a593Smuzhiyun #include <sound/initval.h>
21*4882a593Smuzhiyun #include <linux/of.h>
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun static const struct snd_soc_dapm_widget dir_widgets[] = {
24*4882a593Smuzhiyun SND_SOC_DAPM_INPUT("spdif-in"),
25*4882a593Smuzhiyun };
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun static const struct snd_soc_dapm_route dir_routes[] = {
28*4882a593Smuzhiyun { "Capture", NULL, "spdif-in" },
29*4882a593Smuzhiyun };
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun #define STUB_RATES SNDRV_PCM_RATE_8000_192000
32*4882a593Smuzhiyun #define STUB_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
33*4882a593Smuzhiyun SNDRV_PCM_FMTBIT_S20_3LE | \
34*4882a593Smuzhiyun SNDRV_PCM_FMTBIT_S24_LE | \
35*4882a593Smuzhiyun SNDRV_PCM_FMTBIT_S32_LE | \
36*4882a593Smuzhiyun SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun static struct snd_soc_component_driver soc_codec_spdif_dir = {
39*4882a593Smuzhiyun .dapm_widgets = dir_widgets,
40*4882a593Smuzhiyun .num_dapm_widgets = ARRAY_SIZE(dir_widgets),
41*4882a593Smuzhiyun .dapm_routes = dir_routes,
42*4882a593Smuzhiyun .num_dapm_routes = ARRAY_SIZE(dir_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 dir_stub_dai = {
50*4882a593Smuzhiyun .name = "dir-hifi",
51*4882a593Smuzhiyun .capture = {
52*4882a593Smuzhiyun .stream_name = "Capture",
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_dir_probe(struct platform_device * pdev)60*4882a593Smuzhiyun static int spdif_dir_probe(struct platform_device *pdev)
61*4882a593Smuzhiyun {
62*4882a593Smuzhiyun return devm_snd_soc_register_component(&pdev->dev,
63*4882a593Smuzhiyun &soc_codec_spdif_dir,
64*4882a593Smuzhiyun &dir_stub_dai, 1);
65*4882a593Smuzhiyun }
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun #ifdef CONFIG_OF
68*4882a593Smuzhiyun static const struct of_device_id spdif_dir_dt_ids[] = {
69*4882a593Smuzhiyun { .compatible = "linux,spdif-dir", },
70*4882a593Smuzhiyun { }
71*4882a593Smuzhiyun };
72*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, spdif_dir_dt_ids);
73*4882a593Smuzhiyun #endif
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun static struct platform_driver spdif_dir_driver = {
76*4882a593Smuzhiyun .probe = spdif_dir_probe,
77*4882a593Smuzhiyun .driver = {
78*4882a593Smuzhiyun .name = "spdif-dir",
79*4882a593Smuzhiyun .of_match_table = of_match_ptr(spdif_dir_dt_ids),
80*4882a593Smuzhiyun },
81*4882a593Smuzhiyun };
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun module_platform_driver(spdif_dir_driver);
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun MODULE_DESCRIPTION("ASoC SPDIF DIR driver");
86*4882a593Smuzhiyun MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
87*4882a593Smuzhiyun MODULE_LICENSE("GPL");
88