tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * ALSA SoC SPDIF DIR (Digital Interface Reciever) driver
3 *
4 * Based on ALSA SoC SPDIF DIT driver
5 *
6 * This driver is used by controllers which can operate in DIR (SPDI/F) where
7 * no codec is needed. This file provides stub codec that can be used
8 * in these configurations. SPEAr SPDIF IN Audio controller uses this driver.
9 *
10 * Author: Vipin Kumar, <vipin.kumar@st.com>
11 * Copyright: (C) 2012 ST Microelectronics
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
18#include <linux/module.h>
19#include <linux/moduleparam.h>
20#include <linux/slab.h>
21#include <sound/soc.h>
22#include <sound/pcm.h>
23#include <sound/initval.h>
24#include <linux/of.h>
25
26static const struct snd_soc_dapm_widget dir_widgets[] = {
27 SND_SOC_DAPM_INPUT("spdif-in"),
28};
29
30static const struct snd_soc_dapm_route dir_routes[] = {
31 { "Capture", NULL, "spdif-in" },
32};
33
34#define STUB_RATES SNDRV_PCM_RATE_8000_192000
35#define STUB_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
36 SNDRV_PCM_FMTBIT_S20_3LE | \
37 SNDRV_PCM_FMTBIT_S24_LE | \
38 SNDRV_PCM_FMTBIT_S32_LE | \
39 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
40
41static struct snd_soc_component_driver soc_codec_spdif_dir = {
42 .dapm_widgets = dir_widgets,
43 .num_dapm_widgets = ARRAY_SIZE(dir_widgets),
44 .dapm_routes = dir_routes,
45 .num_dapm_routes = ARRAY_SIZE(dir_routes),
46 .idle_bias_on = 1,
47 .use_pmdown_time = 1,
48 .endianness = 1,
49 .non_legacy_dai_naming = 1,
50};
51
52static struct snd_soc_dai_driver dir_stub_dai = {
53 .name = "dir-hifi",
54 .capture = {
55 .stream_name = "Capture",
56 .channels_min = 1,
57 .channels_max = 384,
58 .rates = STUB_RATES,
59 .formats = STUB_FORMATS,
60 },
61};
62
63static int spdif_dir_probe(struct platform_device *pdev)
64{
65 return devm_snd_soc_register_component(&pdev->dev,
66 &soc_codec_spdif_dir,
67 &dir_stub_dai, 1);
68}
69
70#ifdef CONFIG_OF
71static const struct of_device_id spdif_dir_dt_ids[] = {
72 { .compatible = "linux,spdif-dir", },
73 { }
74};
75MODULE_DEVICE_TABLE(of, spdif_dir_dt_ids);
76#endif
77
78static struct platform_driver spdif_dir_driver = {
79 .probe = spdif_dir_probe,
80 .driver = {
81 .name = "spdif-dir",
82 .of_match_table = of_match_ptr(spdif_dir_dt_ids),
83 },
84};
85
86module_platform_driver(spdif_dir_driver);
87
88MODULE_DESCRIPTION("ASoC SPDIF DIR driver");
89MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
90MODULE_LICENSE("GPL");