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178 lines
4.3 KiB
178 lines
4.3 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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// |
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// soc-util.c -- ALSA SoC Audio Layer utility functions |
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// |
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// Copyright 2009 Wolfson Microelectronics PLC. |
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// |
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// Author: Mark Brown <[email protected]> |
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// Liam Girdwood <[email protected]> |
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#include <linux/platform_device.h> |
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#include <linux/export.h> |
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#include <sound/core.h> |
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#include <sound/pcm.h> |
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#include <sound/pcm_params.h> |
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#include <sound/soc.h> |
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int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots) |
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{ |
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return sample_size * channels * tdm_slots; |
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} |
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EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size); |
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int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params) |
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{ |
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int sample_size; |
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sample_size = snd_pcm_format_width(params_format(params)); |
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if (sample_size < 0) |
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return sample_size; |
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return snd_soc_calc_frame_size(sample_size, params_channels(params), |
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1); |
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} |
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EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size); |
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int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots) |
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{ |
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return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots); |
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} |
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EXPORT_SYMBOL_GPL(snd_soc_calc_bclk); |
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int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params) |
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{ |
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int ret; |
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ret = snd_soc_params_to_frame_size(params); |
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if (ret > 0) |
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return ret * params_rate(params); |
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else |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk); |
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static const struct snd_pcm_hardware dummy_dma_hardware = { |
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/* Random values to keep userspace happy when checking constraints */ |
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.info = SNDRV_PCM_INFO_INTERLEAVED | |
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SNDRV_PCM_INFO_BLOCK_TRANSFER, |
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.buffer_bytes_max = 128*1024, |
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.period_bytes_min = PAGE_SIZE, |
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.period_bytes_max = PAGE_SIZE*2, |
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.periods_min = 2, |
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.periods_max = 128, |
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}; |
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static int dummy_dma_open(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream) |
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{ |
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); |
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/* BE's dont need dummy params */ |
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if (!rtd->dai_link->no_pcm) |
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snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware); |
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return 0; |
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} |
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static const struct snd_soc_component_driver dummy_platform = { |
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.open = dummy_dma_open, |
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}; |
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static const struct snd_soc_component_driver dummy_codec = { |
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.idle_bias_on = 1, |
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.use_pmdown_time = 1, |
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.endianness = 1, |
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.non_legacy_dai_naming = 1, |
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}; |
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#define STUB_RATES SNDRV_PCM_RATE_8000_384000 |
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#define STUB_FORMATS (SNDRV_PCM_FMTBIT_S8 | \ |
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SNDRV_PCM_FMTBIT_U8 | \ |
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SNDRV_PCM_FMTBIT_S16_LE | \ |
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SNDRV_PCM_FMTBIT_U16_LE | \ |
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SNDRV_PCM_FMTBIT_S24_LE | \ |
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SNDRV_PCM_FMTBIT_S24_3LE | \ |
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SNDRV_PCM_FMTBIT_U24_LE | \ |
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SNDRV_PCM_FMTBIT_S32_LE | \ |
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SNDRV_PCM_FMTBIT_U32_LE | \ |
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SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE) |
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/* |
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* The dummy CODEC is only meant to be used in situations where there is no |
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* actual hardware. |
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* |
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* If there is actual hardware even if it does not have a control bus |
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* the hardware will still have constraints like supported samplerates, etc. |
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* which should be modelled. And the data flow graph also should be modelled |
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* using DAPM. |
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*/ |
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static struct snd_soc_dai_driver dummy_dai = { |
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.name = "snd-soc-dummy-dai", |
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.playback = { |
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.stream_name = "Playback", |
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.channels_min = 1, |
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.channels_max = 384, |
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.rates = STUB_RATES, |
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.formats = STUB_FORMATS, |
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}, |
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.capture = { |
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.stream_name = "Capture", |
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.channels_min = 1, |
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.channels_max = 384, |
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.rates = STUB_RATES, |
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.formats = STUB_FORMATS, |
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}, |
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}; |
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int snd_soc_dai_is_dummy(struct snd_soc_dai *dai) |
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{ |
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if (dai->driver == &dummy_dai) |
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return 1; |
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return 0; |
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} |
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static int snd_soc_dummy_probe(struct platform_device *pdev) |
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{ |
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int ret; |
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ret = devm_snd_soc_register_component(&pdev->dev, |
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&dummy_codec, &dummy_dai, 1); |
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if (ret < 0) |
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return ret; |
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ret = devm_snd_soc_register_component(&pdev->dev, &dummy_platform, |
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NULL, 0); |
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return ret; |
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} |
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static struct platform_driver soc_dummy_driver = { |
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.driver = { |
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.name = "snd-soc-dummy", |
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}, |
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.probe = snd_soc_dummy_probe, |
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}; |
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static struct platform_device *soc_dummy_dev; |
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int __init snd_soc_util_init(void) |
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{ |
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int ret; |
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soc_dummy_dev = |
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platform_device_register_simple("snd-soc-dummy", -1, NULL, 0); |
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if (IS_ERR(soc_dummy_dev)) |
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return PTR_ERR(soc_dummy_dev); |
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ret = platform_driver_register(&soc_dummy_driver); |
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if (ret != 0) |
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platform_device_unregister(soc_dummy_dev); |
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return ret; |
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} |
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void __exit snd_soc_util_exit(void) |
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{ |
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platform_driver_unregister(&soc_dummy_driver); |
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platform_device_unregister(soc_dummy_dev); |
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}
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