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1/*
2 * soc-util.c -- ALSA SoC Audio Layer utility functions
3 *
4 * Copyright 2009 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 * Liam Girdwood <lrg@slimlogic.co.uk>
8 *
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
14 */
15
16#include <linux/platform_device.h>
17#include <linux/export.h>
18#include <sound/core.h>
19#include <sound/pcm.h>
20#include <sound/pcm_params.h>
21#include <sound/soc.h>
22
23int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
24{
25 return sample_size * channels * tdm_slots;
26}
27EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);
28
29int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params)
30{
31 int sample_size;
32
33 sample_size = snd_pcm_format_width(params_format(params));
34 if (sample_size < 0)
35 return sample_size;
36
37 return snd_soc_calc_frame_size(sample_size, params_channels(params),
38 1);
39}
40EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
41
42int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots)
43{
44 return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots);
45}
46EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);
47
48int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
49{
50 int ret;
51
52 ret = snd_soc_params_to_frame_size(params);
53
54 if (ret > 0)
55 return ret * params_rate(params);
56 else
57 return ret;
58}
59EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);
60
61static const struct snd_pcm_hardware dummy_dma_hardware = {
62 /* Random values to keep userspace happy when checking constraints */
63 .info = SNDRV_PCM_INFO_INTERLEAVED |
64 SNDRV_PCM_INFO_BLOCK_TRANSFER,
65 .buffer_bytes_max = 128*1024,
66 .period_bytes_min = PAGE_SIZE,
67 .period_bytes_max = PAGE_SIZE*2,
68 .periods_min = 2,
69 .periods_max = 128,
70};
71
72static int dummy_dma_open(struct snd_pcm_substream *substream)
73{
74 struct snd_soc_pcm_runtime *rtd = substream->private_data;
75
76 /* BE's dont need dummy params */
77 if (!rtd->dai_link->no_pcm)
78 snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);
79
80 return 0;
81}
82
83static struct snd_pcm_ops dummy_dma_ops = {
84 .open = dummy_dma_open,
85 .ioctl = snd_pcm_lib_ioctl,
86};
87
88static struct snd_soc_platform_driver dummy_platform = {
89 .ops = &dummy_dma_ops,
90};
91
92static struct snd_soc_codec_driver dummy_codec;
93
94#define STUB_RATES SNDRV_PCM_RATE_8000_192000
95#define STUB_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
96 SNDRV_PCM_FMTBIT_U8 | \
97 SNDRV_PCM_FMTBIT_S16_LE | \
98 SNDRV_PCM_FMTBIT_U16_LE | \
99 SNDRV_PCM_FMTBIT_S24_LE | \
100 SNDRV_PCM_FMTBIT_U24_LE | \
101 SNDRV_PCM_FMTBIT_S32_LE | \
102 SNDRV_PCM_FMTBIT_U32_LE | \
103 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
104/*
105 * The dummy CODEC is only meant to be used in situations where there is no
106 * actual hardware.
107 *
108 * If there is actual hardware even if it does not have a control bus
109 * the hardware will still have constraints like supported samplerates, etc.
110 * which should be modelled. And the data flow graph also should be modelled
111 * using DAPM.
112 */
113static struct snd_soc_dai_driver dummy_dai = {
114 .name = "snd-soc-dummy-dai",
115 .playback = {
116 .stream_name = "Playback",
117 .channels_min = 1,
118 .channels_max = 384,
119 .rates = STUB_RATES,
120 .formats = STUB_FORMATS,
121 },
122 .capture = {
123 .stream_name = "Capture",
124 .channels_min = 1,
125 .channels_max = 384,
126 .rates = STUB_RATES,
127 .formats = STUB_FORMATS,
128 },
129};
130
131int snd_soc_dai_is_dummy(struct snd_soc_dai *dai)
132{
133 if (dai->driver == &dummy_dai)
134 return 1;
135 return 0;
136}
137
138static int snd_soc_dummy_probe(struct platform_device *pdev)
139{
140 int ret;
141
142 ret = snd_soc_register_codec(&pdev->dev, &dummy_codec, &dummy_dai, 1);
143 if (ret < 0)
144 return ret;
145
146 ret = snd_soc_register_platform(&pdev->dev, &dummy_platform);
147 if (ret < 0) {
148 snd_soc_unregister_codec(&pdev->dev);
149 return ret;
150 }
151
152 return ret;
153}
154
155static int snd_soc_dummy_remove(struct platform_device *pdev)
156{
157 snd_soc_unregister_platform(&pdev->dev);
158 snd_soc_unregister_codec(&pdev->dev);
159
160 return 0;
161}
162
163static struct platform_driver soc_dummy_driver = {
164 .driver = {
165 .name = "snd-soc-dummy",
166 },
167 .probe = snd_soc_dummy_probe,
168 .remove = snd_soc_dummy_remove,
169};
170
171static struct platform_device *soc_dummy_dev;
172
173int __init snd_soc_util_init(void)
174{
175 int ret;
176
177 soc_dummy_dev =
178 platform_device_register_simple("snd-soc-dummy", -1, NULL, 0);
179 if (IS_ERR(soc_dummy_dev))
180 return PTR_ERR(soc_dummy_dev);
181
182 ret = platform_driver_register(&soc_dummy_driver);
183 if (ret != 0)
184 platform_device_unregister(soc_dummy_dev);
185
186 return ret;
187}
188
189void __exit snd_soc_util_exit(void)
190{
191 platform_device_unregister(soc_dummy_dev);
192 platform_driver_unregister(&soc_dummy_driver);
193}
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
134static int snd_soc_dummy_probe(struct platform_device *pdev)
135{
136 int ret;
137
138 ret = devm_snd_soc_register_component(&pdev->dev,
139 &dummy_codec, &dummy_dai, 1);
140 if (ret < 0)
141 return ret;
142
143 ret = devm_snd_soc_register_component(&pdev->dev, &dummy_platform,
144 NULL, 0);
145
146 return ret;
147}
148
149static struct platform_driver soc_dummy_driver = {
150 .driver = {
151 .name = "snd-soc-dummy",
152 },
153 .probe = snd_soc_dummy_probe,
154};
155
156static struct platform_device *soc_dummy_dev;
157
158int __init snd_soc_util_init(void)
159{
160 int ret;
161
162 soc_dummy_dev =
163 platform_device_register_simple("snd-soc-dummy", -1, NULL, 0);
164 if (IS_ERR(soc_dummy_dev))
165 return PTR_ERR(soc_dummy_dev);
166
167 ret = platform_driver_register(&soc_dummy_driver);
168 if (ret != 0)
169 platform_device_unregister(soc_dummy_dev);
170
171 return ret;
172}
173
174void __exit snd_soc_util_exit(void)
175{
176 platform_driver_unregister(&soc_dummy_driver);
177 platform_device_unregister(soc_dummy_dev);
178}