Merge commit 'v2.6.39-rc3' into for-2.6.39
[pandora-kernel.git] / sound / soc / soc-utils.c
1 /*
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
16 #include <sound/core.h>
17 #include <sound/pcm.h>
18 #include <sound/pcm_params.h>
19 #include <sound/soc.h>
20
21 int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
22 {
23         return sample_size * channels * tdm_slots;
24 }
25 EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);
26
27 int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params)
28 {
29         int sample_size;
30
31         sample_size = snd_pcm_format_width(params_format(params));
32         if (sample_size < 0)
33                 return sample_size;
34
35         return snd_soc_calc_frame_size(sample_size, params_channels(params),
36                                        1);
37 }
38 EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
39
40 int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots)
41 {
42         return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots);
43 }
44 EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);
45
46 int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
47 {
48         int ret;
49
50         ret = snd_soc_params_to_frame_size(params);
51
52         if (ret > 0)
53                 return ret * params_rate(params);
54         else
55                 return ret;
56 }
57 EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);