From 7aae816dae150caad8880357e42303935c0179a8 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Tue, 10 Nov 2009 16:08:04 +0000 Subject: ASoC: Add bit clock rate calculator utility functions Many devices need to calculate the bit clock rate desired to work out the clock configuration required for the device. Provide utility functions to do this using both hw_params structures and raw numbers. Signed-off-by: Mark Brown Acked-by: Liam Girdwood --- sound/soc/soc-utils.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 sound/soc/soc-utils.c (limited to 'sound/soc/soc-utils.c') diff --git a/sound/soc/soc-utils.c b/sound/soc/soc-utils.c new file mode 100644 index 00000000000..b16aaaeb0aa --- /dev/null +++ b/sound/soc/soc-utils.c @@ -0,0 +1,68 @@ +/* + * soc-util.c -- ALSA SoC Audio Layer utility functions + * + * Copyright 2009 Wolfson Microelectronics PLC. + * + * Author: Mark Brown + * Liam Girdwood + * + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ + +#include +#include +#include +#include + +int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots) +{ + return sample_size * channels * tdm_slots; +} +EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size); + +int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params) +{ + int sample_size; + + switch (params_format(params)) { + case SNDRV_PCM_FORMAT_S16_LE: + case SNDRV_PCM_FORMAT_S16_BE: + sample_size = 16; + break; + case SNDRV_PCM_FORMAT_S20_3LE: + case SNDRV_PCM_FORMAT_S20_3BE: + sample_size = 20; + break; + case SNDRV_PCM_FORMAT_S24_LE: + case SNDRV_PCM_FORMAT_S24_BE: + sample_size = 24; + break; + case SNDRV_PCM_FORMAT_S32_LE: + case SNDRV_PCM_FORMAT_S32_BE: + sample_size = 32; + break; + default: + return -ENOTSUPP; + } + + return snd_soc_calc_frame_size(sample_size, params_channels(params), + 1); +} +EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size); + +int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params) +{ + int ret; + + ret = snd_soc_params_to_frame_size(params); + + if (ret > 0) + return ret * params_rate(params); + else + return ret; +} +EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk); -- cgit v1.2.3-70-g09d2 From c0fa59df7214e546f8a37bc677867ac7b67b5c93 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Thu, 19 Nov 2009 11:36:10 +0000 Subject: ASoC: Add BCLK calculation utility for TDM mode too Acked-by: Liam Girdwood Signed-off-by: Mark Brown --- include/sound/soc.h | 1 + sound/soc/soc-utils.c | 6 ++++++ 2 files changed, 7 insertions(+) (limited to 'sound/soc/soc-utils.c') diff --git a/include/sound/soc.h b/include/sound/soc.h index 13b117aac5d..0d7718f9280 100644 --- a/include/sound/soc.h +++ b/include/sound/soc.h @@ -230,6 +230,7 @@ int snd_soc_new_pcms(struct snd_soc_device *socdev, int idx, const char *xid); /* Utility functions to get clock rates from various things */ int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots); int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params); +int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots); int snd_soc_params_to_bclk(struct snd_pcm_hw_params *parms); /* set runtime hw params */ diff --git a/sound/soc/soc-utils.c b/sound/soc/soc-utils.c index b16aaaeb0aa..1d07b931f3d 100644 --- a/sound/soc/soc-utils.c +++ b/sound/soc/soc-utils.c @@ -54,6 +54,12 @@ int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params) } EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size); +int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots) +{ + return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots); +} +EXPORT_SYMBOL_GPL(snd_soc_calc_bclk); + int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params) { int ret; -- cgit v1.2.3-70-g09d2