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Mark Brown7aae8162009-11-10 16:08:04 +00001/*
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
Mark Brown848dd8b2011-04-27 18:16:32 +010016#include <linux/platform_device.h>
Paul Gortmakerd81a6d72011-09-22 09:34:58 -040017#include <linux/export.h>
Mark Brown7aae8162009-11-10 16:08:04 +000018#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
Mark Brown3d8b2ce2011-01-31 20:14:38 +000033 sample_size = snd_pcm_format_width(params_format(params));
34 if (sample_size < 0)
35 return sample_size;
Mark Brown7aae8162009-11-10 16:08:04 +000036
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
Mark Brownc0fa59d2009-11-19 11:36:10 +000042int 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
Mark Brown7aae8162009-11-10 16:08:04 +000048int 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);
Mark Brown848dd8b2011-04-27 18:16:32 +010060
Mark Browncefcc032011-12-05 20:50:45 +000061static const struct snd_pcm_hardware dummy_dma_hardware = {
Mark Browncefcc032011-12-05 20:50:45 +000062 /* 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{
Liam Girdwood7f05cc92013-09-13 18:09:47 +010074 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);
Mark Browncefcc032011-12-05 20:50:45 +000079
80 return 0;
81}
82
Julia Lawall115c7252016-09-08 02:35:23 +020083static const struct snd_pcm_ops dummy_dma_ops = {
Mark Browncefcc032011-12-05 20:50:45 +000084 .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};
Mark Brown848dd8b2011-04-27 18:16:32 +010091
Liam Girdwood7aca69f2012-01-09 12:36:24 +000092static struct snd_soc_codec_driver dummy_codec;
Stas Sergeev60b6f1a2013-04-17 16:34:06 +040093
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)
Anatol Pomozovd76f4192015-08-31 08:24:23 -0700104/*
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 */
Liam Girdwood7aca69f2012-01-09 12:36:24 +0000113static struct snd_soc_dai_driver dummy_dai = {
114 .name = "snd-soc-dummy-dai",
Stas Sergeev60b6f1a2013-04-17 16:34:06 +0400115 .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 },
Liam Girdwood7aca69f2012-01-09 12:36:24 +0000129};
130
Liam Girdwoodbece9e92014-01-08 10:40:18 +0000131int 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
Bill Pembertone51e97e2012-12-07 09:26:36 -0500138static int snd_soc_dummy_probe(struct platform_device *pdev)
Mark Brown848dd8b2011-04-27 18:16:32 +0100139{
Liam Girdwood7aca69f2012-01-09 12:36:24 +0000140 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;
Mark Brown848dd8b2011-04-27 18:16:32 +0100153}
154
Bill Pembertone51e97e2012-12-07 09:26:36 -0500155static int snd_soc_dummy_remove(struct platform_device *pdev)
Mark Brown848dd8b2011-04-27 18:16:32 +0100156{
157 snd_soc_unregister_platform(&pdev->dev);
Liam Girdwood7aca69f2012-01-09 12:36:24 +0000158 snd_soc_unregister_codec(&pdev->dev);
Mark Brown848dd8b2011-04-27 18:16:32 +0100159
160 return 0;
161}
162
163static struct platform_driver soc_dummy_driver = {
164 .driver = {
165 .name = "snd-soc-dummy",
Mark Brown848dd8b2011-04-27 18:16:32 +0100166 },
167 .probe = snd_soc_dummy_probe,
Bill Pembertone51e97e2012-12-07 09:26:36 -0500168 .remove = snd_soc_dummy_remove,
Mark Brown848dd8b2011-04-27 18:16:32 +0100169};
170
171static struct platform_device *soc_dummy_dev;
172
Mark Brownfb257892011-04-28 10:57:54 +0100173int __init snd_soc_util_init(void)
Mark Brown848dd8b2011-04-27 18:16:32 +0100174{
175 int ret;
176
Uwe Kleine-König7d0cd222013-05-17 11:26:15 +0200177 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);
Mark Brown848dd8b2011-04-27 18:16:32 +0100181
182 ret = platform_driver_register(&soc_dummy_driver);
183 if (ret != 0)
184 platform_device_unregister(soc_dummy_dev);
185
186 return ret;
187}
Mark Brown848dd8b2011-04-27 18:16:32 +0100188
Mark Brownfb257892011-04-28 10:57:54 +0100189void __exit snd_soc_util_exit(void)
Mark Brown848dd8b2011-04-27 18:16:32 +0100190{
191 platform_device_unregister(soc_dummy_dev);
192 platform_driver_unregister(&soc_dummy_driver);
193}