2 * soc-util.c -- ALSA SoC Audio Layer utility functions
4 * Copyright 2009 Wolfson Microelectronics PLC.
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 * Liam Girdwood <lrg@slimlogic.co.uk>
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.
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>
23 int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
25 return sample_size * channels * tdm_slots;
27 EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);
29 int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params)
33 sample_size = snd_pcm_format_width(params_format(params));
37 return snd_soc_calc_frame_size(sample_size, params_channels(params),
40 EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
42 int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots)
44 return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots);
46 EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);
48 int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
52 ret = snd_soc_params_to_frame_size(params);
55 return ret * params_rate(params);
59 EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);
61 static 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,
72 static int dummy_dma_open(struct snd_pcm_substream *substream)
74 struct snd_soc_pcm_runtime *rtd = substream->private_data;
76 /* BE's dont need dummy params */
77 if (!rtd->dai_link->no_pcm)
78 snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);
83 static struct snd_pcm_ops dummy_dma_ops = {
84 .open = dummy_dma_open,
85 .ioctl = snd_pcm_lib_ioctl,
88 static struct snd_soc_platform_driver dummy_platform = {
89 .ops = &dummy_dma_ops,
92 static struct snd_soc_codec_driver dummy_codec;
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)
105 * The dummy CODEC is only meant to be used in situations where there is no
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
113 static struct snd_soc_dai_driver dummy_dai = {
114 .name = "snd-soc-dummy-dai",
116 .stream_name = "Playback",
120 .formats = STUB_FORMATS,
123 .stream_name = "Capture",
127 .formats = STUB_FORMATS,
131 int snd_soc_dai_is_dummy(struct snd_soc_dai *dai)
133 if (dai->driver == &dummy_dai)
138 static int snd_soc_dummy_probe(struct platform_device *pdev)
142 ret = snd_soc_register_codec(&pdev->dev, &dummy_codec, &dummy_dai, 1);
146 ret = snd_soc_register_platform(&pdev->dev, &dummy_platform);
148 snd_soc_unregister_codec(&pdev->dev);
155 static int snd_soc_dummy_remove(struct platform_device *pdev)
157 snd_soc_unregister_platform(&pdev->dev);
158 snd_soc_unregister_codec(&pdev->dev);
163 static struct platform_driver soc_dummy_driver = {
165 .name = "snd-soc-dummy",
167 .probe = snd_soc_dummy_probe,
168 .remove = snd_soc_dummy_remove,
171 static struct platform_device *soc_dummy_dev;
173 int __init snd_soc_util_init(void)
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);
182 ret = platform_driver_register(&soc_dummy_driver);
184 platform_device_unregister(soc_dummy_dev);
189 void __exit snd_soc_util_exit(void)
191 platform_device_unregister(soc_dummy_dev);
192 platform_driver_unregister(&soc_dummy_driver);