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