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 <sound/core.h>
18 #include <sound/pcm.h>
19 #include <sound/pcm_params.h>
20 #include <sound/soc.h>
22 int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
24 return sample_size * channels * tdm_slots;
26 EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);
28 int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params)
32 sample_size = snd_pcm_format_width(params_format(params));
36 return snd_soc_calc_frame_size(sample_size, params_channels(params),
39 EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
41 int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots)
43 return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots);
45 EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);
47 int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
51 ret = snd_soc_params_to_frame_size(params);
54 return ret * params_rate(params);
58 EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);
60 static struct snd_soc_platform_driver dummy_platform;
62 static __devinit int snd_soc_dummy_probe(struct platform_device *pdev)
64 return snd_soc_register_platform(&pdev->dev, &dummy_platform);
67 static __devexit int snd_soc_dummy_remove(struct platform_device *pdev)
69 snd_soc_unregister_platform(&pdev->dev);
74 static struct platform_driver soc_dummy_driver = {
76 .name = "snd-soc-dummy",
79 .probe = snd_soc_dummy_probe,
80 .remove = __devexit_p(snd_soc_dummy_remove),
83 static struct platform_device *soc_dummy_dev;
85 int __init snd_soc_util_init(void)
89 soc_dummy_dev = platform_device_alloc("snd-soc-dummy", -1);
93 ret = platform_device_add(soc_dummy_dev);
95 platform_device_put(soc_dummy_dev);
99 ret = platform_driver_register(&soc_dummy_driver);
101 platform_device_unregister(soc_dummy_dev);
106 void __exit snd_soc_util_exit(void)
108 platform_device_unregister(soc_dummy_dev);
109 platform_driver_unregister(&soc_dummy_driver);