tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1// SPDX-License-Identifier: GPL-2.0+
2//
3// soc-util.c -- ALSA SoC Audio Layer utility functions
4//
5// Copyright 2009 Wolfson Microelectronics PLC.
6//
7// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8// Liam Girdwood <lrg@slimlogic.co.uk>
9
10#include <linux/platform_device.h>
11#include <linux/export.h>
12#include <sound/core.h>
13#include <sound/pcm.h>
14#include <sound/pcm_params.h>
15#include <sound/soc.h>
16
17int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
18{
19 return sample_size * channels * tdm_slots;
20}
21EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);
22
23int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params)
24{
25 int sample_size;
26
27 sample_size = snd_pcm_format_width(params_format(params));
28 if (sample_size < 0)
29 return sample_size;
30
31 return snd_soc_calc_frame_size(sample_size, params_channels(params),
32 1);
33}
34EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
35
36int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots)
37{
38 return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots);
39}
40EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);
41
42int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
43{
44 int ret;
45
46 ret = snd_soc_params_to_frame_size(params);
47
48 if (ret > 0)
49 return ret * params_rate(params);
50 else
51 return ret;
52}
53EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);
54
55static const struct snd_pcm_hardware dummy_dma_hardware = {
56 /* Random values to keep userspace happy when checking constraints */
57 .info = SNDRV_PCM_INFO_INTERLEAVED |
58 SNDRV_PCM_INFO_BLOCK_TRANSFER,
59 .buffer_bytes_max = 128*1024,
60 .period_bytes_min = PAGE_SIZE,
61 .period_bytes_max = PAGE_SIZE*2,
62 .periods_min = 2,
63 .periods_max = 128,
64};
65
66static int dummy_dma_open(struct snd_soc_component *component,
67 struct snd_pcm_substream *substream)
68{
69 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
70
71 /* BE's dont need dummy params */
72 if (!rtd->dai_link->no_pcm)
73 snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);
74
75 return 0;
76}
77
78static const struct snd_soc_component_driver dummy_platform = {
79 .open = dummy_dma_open,
80};
81
82static const struct snd_soc_component_driver dummy_codec = {
83 .idle_bias_on = 1,
84 .use_pmdown_time = 1,
85 .endianness = 1,
86 .non_legacy_dai_naming = 1,
87};
88
89#define STUB_RATES SNDRV_PCM_RATE_8000_384000
90#define STUB_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
91 SNDRV_PCM_FMTBIT_U8 | \
92 SNDRV_PCM_FMTBIT_S16_LE | \
93 SNDRV_PCM_FMTBIT_U16_LE | \
94 SNDRV_PCM_FMTBIT_S24_LE | \
95 SNDRV_PCM_FMTBIT_S24_3LE | \
96 SNDRV_PCM_FMTBIT_U24_LE | \
97 SNDRV_PCM_FMTBIT_S32_LE | \
98 SNDRV_PCM_FMTBIT_U32_LE | \
99 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
100/*
101 * The dummy CODEC is only meant to be used in situations where there is no
102 * actual hardware.
103 *
104 * If there is actual hardware even if it does not have a control bus
105 * the hardware will still have constraints like supported samplerates, etc.
106 * which should be modelled. And the data flow graph also should be modelled
107 * using DAPM.
108 */
109static struct snd_soc_dai_driver dummy_dai = {
110 .name = "snd-soc-dummy-dai",
111 .playback = {
112 .stream_name = "Playback",
113 .channels_min = 1,
114 .channels_max = 384,
115 .rates = STUB_RATES,
116 .formats = STUB_FORMATS,
117 },
118 .capture = {
119 .stream_name = "Capture",
120 .channels_min = 1,
121 .channels_max = 384,
122 .rates = STUB_RATES,
123 .formats = STUB_FORMATS,
124 },
125};
126
127int snd_soc_dai_is_dummy(struct snd_soc_dai *dai)
128{
129 if (dai->driver == &dummy_dai)
130 return 1;
131 return 0;
132}
133
134int snd_soc_component_is_dummy(struct snd_soc_component *component)
135{
136 return ((component->driver == &dummy_platform) ||
137 (component->driver == &dummy_codec));
138}
139
140static int snd_soc_dummy_probe(struct platform_device *pdev)
141{
142 int ret;
143
144 ret = devm_snd_soc_register_component(&pdev->dev,
145 &dummy_codec, &dummy_dai, 1);
146 if (ret < 0)
147 return ret;
148
149 ret = devm_snd_soc_register_component(&pdev->dev, &dummy_platform,
150 NULL, 0);
151
152 return ret;
153}
154
155static struct platform_driver soc_dummy_driver = {
156 .driver = {
157 .name = "snd-soc-dummy",
158 },
159 .probe = snd_soc_dummy_probe,
160};
161
162static struct platform_device *soc_dummy_dev;
163
164int __init snd_soc_util_init(void)
165{
166 int ret;
167
168 soc_dummy_dev =
169 platform_device_register_simple("snd-soc-dummy", -1, NULL, 0);
170 if (IS_ERR(soc_dummy_dev))
171 return PTR_ERR(soc_dummy_dev);
172
173 ret = platform_driver_register(&soc_dummy_driver);
174 if (ret != 0)
175 platform_device_unregister(soc_dummy_dev);
176
177 return ret;
178}
179
180void __exit snd_soc_util_exit(void)
181{
182 platform_driver_unregister(&soc_dummy_driver);
183 platform_device_unregister(soc_dummy_dev);
184}