17aae816dSMark Brown /* 27aae816dSMark Brown * soc-util.c -- ALSA SoC Audio Layer utility functions 37aae816dSMark Brown * 47aae816dSMark Brown * Copyright 2009 Wolfson Microelectronics PLC. 57aae816dSMark Brown * 67aae816dSMark Brown * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 77aae816dSMark Brown * Liam Girdwood <lrg@slimlogic.co.uk> 87aae816dSMark Brown * 97aae816dSMark Brown * 107aae816dSMark Brown * This program is free software; you can redistribute it and/or modify it 117aae816dSMark Brown * under the terms of the GNU General Public License as published by the 127aae816dSMark Brown * Free Software Foundation; either version 2 of the License, or (at your 137aae816dSMark Brown * option) any later version. 147aae816dSMark Brown */ 157aae816dSMark Brown 16*848dd8beSMark Brown #include <linux/platform_device.h> 177aae816dSMark Brown #include <sound/core.h> 187aae816dSMark Brown #include <sound/pcm.h> 197aae816dSMark Brown #include <sound/pcm_params.h> 207aae816dSMark Brown #include <sound/soc.h> 217aae816dSMark Brown 227aae816dSMark Brown int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots) 237aae816dSMark Brown { 247aae816dSMark Brown return sample_size * channels * tdm_slots; 257aae816dSMark Brown } 267aae816dSMark Brown EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size); 277aae816dSMark Brown 287aae816dSMark Brown int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params) 297aae816dSMark Brown { 307aae816dSMark Brown int sample_size; 317aae816dSMark Brown 323d8b2ce0SMark Brown sample_size = snd_pcm_format_width(params_format(params)); 333d8b2ce0SMark Brown if (sample_size < 0) 343d8b2ce0SMark Brown return sample_size; 357aae816dSMark Brown 367aae816dSMark Brown return snd_soc_calc_frame_size(sample_size, params_channels(params), 377aae816dSMark Brown 1); 387aae816dSMark Brown } 397aae816dSMark Brown EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size); 407aae816dSMark Brown 41c0fa59dfSMark Brown int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots) 42c0fa59dfSMark Brown { 43c0fa59dfSMark Brown return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots); 44c0fa59dfSMark Brown } 45c0fa59dfSMark Brown EXPORT_SYMBOL_GPL(snd_soc_calc_bclk); 46c0fa59dfSMark Brown 477aae816dSMark Brown int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params) 487aae816dSMark Brown { 497aae816dSMark Brown int ret; 507aae816dSMark Brown 517aae816dSMark Brown ret = snd_soc_params_to_frame_size(params); 527aae816dSMark Brown 537aae816dSMark Brown if (ret > 0) 547aae816dSMark Brown return ret * params_rate(params); 557aae816dSMark Brown else 567aae816dSMark Brown return ret; 577aae816dSMark Brown } 587aae816dSMark Brown EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk); 59*848dd8beSMark Brown 60*848dd8beSMark Brown static struct snd_soc_platform_driver dummy_platform; 61*848dd8beSMark Brown 62*848dd8beSMark Brown static __devinit int snd_soc_dummy_probe(struct platform_device *pdev) 63*848dd8beSMark Brown { 64*848dd8beSMark Brown return snd_soc_register_platform(&pdev->dev, &dummy_platform); 65*848dd8beSMark Brown } 66*848dd8beSMark Brown 67*848dd8beSMark Brown static __devexit int snd_soc_dummy_remove(struct platform_device *pdev) 68*848dd8beSMark Brown { 69*848dd8beSMark Brown snd_soc_unregister_platform(&pdev->dev); 70*848dd8beSMark Brown 71*848dd8beSMark Brown return 0; 72*848dd8beSMark Brown } 73*848dd8beSMark Brown 74*848dd8beSMark Brown static struct platform_driver soc_dummy_driver = { 75*848dd8beSMark Brown .driver = { 76*848dd8beSMark Brown .name = "snd-soc-dummy", 77*848dd8beSMark Brown .owner = THIS_MODULE, 78*848dd8beSMark Brown }, 79*848dd8beSMark Brown .probe = snd_soc_dummy_probe, 80*848dd8beSMark Brown .remove = __devexit_p(snd_soc_dummy_remove), 81*848dd8beSMark Brown }; 82*848dd8beSMark Brown 83*848dd8beSMark Brown static struct platform_device *soc_dummy_dev; 84*848dd8beSMark Brown 85*848dd8beSMark Brown static int __init snd_soc_util_init(void) 86*848dd8beSMark Brown { 87*848dd8beSMark Brown int ret; 88*848dd8beSMark Brown 89*848dd8beSMark Brown soc_dummy_dev = platform_device_alloc("snd-soc-dummy", -1); 90*848dd8beSMark Brown if (!soc_dummy_dev) 91*848dd8beSMark Brown return -ENOMEM; 92*848dd8beSMark Brown 93*848dd8beSMark Brown ret = platform_device_add(soc_dummy_dev); 94*848dd8beSMark Brown if (ret != 0) { 95*848dd8beSMark Brown platform_device_put(soc_dummy_dev); 96*848dd8beSMark Brown return ret; 97*848dd8beSMark Brown } 98*848dd8beSMark Brown 99*848dd8beSMark Brown ret = platform_driver_register(&soc_dummy_driver); 100*848dd8beSMark Brown if (ret != 0) 101*848dd8beSMark Brown platform_device_unregister(soc_dummy_dev); 102*848dd8beSMark Brown 103*848dd8beSMark Brown return ret; 104*848dd8beSMark Brown } 105*848dd8beSMark Brown module_init(snd_soc_util_init); 106*848dd8beSMark Brown 107*848dd8beSMark Brown static void __exit snd_soc_util_exit(void) 108*848dd8beSMark Brown { 109*848dd8beSMark Brown platform_device_unregister(soc_dummy_dev); 110*848dd8beSMark Brown platform_driver_unregister(&soc_dummy_driver); 111*848dd8beSMark Brown } 112*848dd8beSMark Brown module_exit(snd_soc_util_exit); 113