141 lines
3.3 KiB
C
141 lines
3.3 KiB
C
/*
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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 <broonie@opensource.wolfsonmicro.com>
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* Liam Girdwood <lrg@slimlogic.co.uk>
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*
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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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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.formats = 0xffffffff,
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.channels_min = 1,
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.channels_max = UINT_MAX,
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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_pcm_substream *substream)
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{
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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 struct snd_pcm_ops dummy_dma_ops = {
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.open = dummy_dma_open,
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.ioctl = snd_pcm_lib_ioctl,
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};
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static struct snd_soc_platform_driver dummy_platform = {
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.ops = &dummy_dma_ops,
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};
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static __devinit int snd_soc_dummy_probe(struct platform_device *pdev)
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{
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return snd_soc_register_platform(&pdev->dev, &dummy_platform);
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}
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static __devexit int snd_soc_dummy_remove(struct platform_device *pdev)
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{
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snd_soc_unregister_platform(&pdev->dev);
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return 0;
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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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.owner = THIS_MODULE,
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},
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.probe = snd_soc_dummy_probe,
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.remove = __devexit_p(snd_soc_dummy_remove),
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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 = platform_device_alloc("snd-soc-dummy", -1);
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if (!soc_dummy_dev)
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return -ENOMEM;
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ret = platform_device_add(soc_dummy_dev);
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if (ret != 0) {
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platform_device_put(soc_dummy_dev);
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return ret;
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}
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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_device_unregister(soc_dummy_dev);
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platform_driver_unregister(&soc_dummy_driver);
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}
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