xref: /openbmc/linux/sound/soc/soc-utils.c (revision b6dcefde)
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 	switch (params_format(params)) {
32 	case SNDRV_PCM_FORMAT_S16_LE:
33 	case SNDRV_PCM_FORMAT_S16_BE:
34 		sample_size = 16;
35 		break;
36 	case SNDRV_PCM_FORMAT_S20_3LE:
37 	case SNDRV_PCM_FORMAT_S20_3BE:
38 		sample_size = 20;
39 		break;
40 	case SNDRV_PCM_FORMAT_S24_LE:
41 	case SNDRV_PCM_FORMAT_S24_BE:
42 		sample_size = 24;
43 		break;
44 	case SNDRV_PCM_FORMAT_S32_LE:
45 	case SNDRV_PCM_FORMAT_S32_BE:
46 		sample_size = 32;
47 		break;
48 	default:
49 		return -ENOTSUPP;
50 	}
51 
52 	return snd_soc_calc_frame_size(sample_size, params_channels(params),
53 				       1);
54 }
55 EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
56 
57 int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots)
58 {
59 	return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots);
60 }
61 EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);
62 
63 int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
64 {
65 	int ret;
66 
67 	ret = snd_soc_params_to_frame_size(params);
68 
69 	if (ret > 0)
70 		return ret * params_rate(params);
71 	else
72 		return ret;
73 }
74 EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);
75