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 16848dd8beSMark Brown #include <linux/platform_device.h> 17d81a6d71SPaul Gortmaker #include <linux/export.h> 187aae816dSMark Brown #include <sound/core.h> 197aae816dSMark Brown #include <sound/pcm.h> 207aae816dSMark Brown #include <sound/pcm_params.h> 217aae816dSMark Brown #include <sound/soc.h> 227aae816dSMark Brown 237aae816dSMark Brown int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots) 247aae816dSMark Brown { 257aae816dSMark Brown return sample_size * channels * tdm_slots; 267aae816dSMark Brown } 277aae816dSMark Brown EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size); 287aae816dSMark Brown 297aae816dSMark Brown int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params) 307aae816dSMark Brown { 317aae816dSMark Brown int sample_size; 327aae816dSMark Brown 333d8b2ce0SMark Brown sample_size = snd_pcm_format_width(params_format(params)); 343d8b2ce0SMark Brown if (sample_size < 0) 353d8b2ce0SMark Brown return sample_size; 367aae816dSMark Brown 377aae816dSMark Brown return snd_soc_calc_frame_size(sample_size, params_channels(params), 387aae816dSMark Brown 1); 397aae816dSMark Brown } 407aae816dSMark Brown EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size); 417aae816dSMark Brown 42c0fa59dfSMark Brown int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots) 43c0fa59dfSMark Brown { 44c0fa59dfSMark Brown return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots); 45c0fa59dfSMark Brown } 46c0fa59dfSMark Brown EXPORT_SYMBOL_GPL(snd_soc_calc_bclk); 47c0fa59dfSMark Brown 487aae816dSMark Brown int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params) 497aae816dSMark Brown { 507aae816dSMark Brown int ret; 517aae816dSMark Brown 527aae816dSMark Brown ret = snd_soc_params_to_frame_size(params); 537aae816dSMark Brown 547aae816dSMark Brown if (ret > 0) 557aae816dSMark Brown return ret * params_rate(params); 567aae816dSMark Brown else 577aae816dSMark Brown return ret; 587aae816dSMark Brown } 597aae816dSMark Brown EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk); 60848dd8beSMark Brown 61cefcc03fSMark Brown static const struct snd_pcm_hardware dummy_dma_hardware = { 62cefcc03fSMark Brown .formats = 0xffffffff, 63cefcc03fSMark Brown .channels_min = 1, 64cefcc03fSMark Brown .channels_max = UINT_MAX, 65cefcc03fSMark Brown 66cefcc03fSMark Brown /* Random values to keep userspace happy when checking constraints */ 67cefcc03fSMark Brown .info = SNDRV_PCM_INFO_INTERLEAVED | 68cefcc03fSMark Brown SNDRV_PCM_INFO_BLOCK_TRANSFER, 69cefcc03fSMark Brown .buffer_bytes_max = 128*1024, 70cefcc03fSMark Brown .period_bytes_min = PAGE_SIZE, 71cefcc03fSMark Brown .period_bytes_max = PAGE_SIZE*2, 72cefcc03fSMark Brown .periods_min = 2, 73cefcc03fSMark Brown .periods_max = 128, 74cefcc03fSMark Brown }; 75cefcc03fSMark Brown 76cefcc03fSMark Brown static int dummy_dma_open(struct snd_pcm_substream *substream) 77cefcc03fSMark Brown { 78cefcc03fSMark Brown snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware); 79cefcc03fSMark Brown 80cefcc03fSMark Brown return 0; 81cefcc03fSMark Brown } 82cefcc03fSMark Brown 83cefcc03fSMark Brown static struct snd_pcm_ops dummy_dma_ops = { 84cefcc03fSMark Brown .open = dummy_dma_open, 85cefcc03fSMark Brown .ioctl = snd_pcm_lib_ioctl, 86cefcc03fSMark Brown }; 87cefcc03fSMark Brown 88cefcc03fSMark Brown static struct snd_soc_platform_driver dummy_platform = { 89cefcc03fSMark Brown .ops = &dummy_dma_ops, 90cefcc03fSMark Brown }; 91848dd8beSMark Brown 927aca69f9SLiam Girdwood static struct snd_soc_codec_driver dummy_codec; 937aca69f9SLiam Girdwood static struct snd_soc_dai_driver dummy_dai = { 947aca69f9SLiam Girdwood .name = "snd-soc-dummy-dai", 957aca69f9SLiam Girdwood }; 967aca69f9SLiam Girdwood 97*e51e97eeSBill Pemberton static int snd_soc_dummy_probe(struct platform_device *pdev) 98848dd8beSMark Brown { 997aca69f9SLiam Girdwood int ret; 1007aca69f9SLiam Girdwood 1017aca69f9SLiam Girdwood ret = snd_soc_register_codec(&pdev->dev, &dummy_codec, &dummy_dai, 1); 1027aca69f9SLiam Girdwood if (ret < 0) 1037aca69f9SLiam Girdwood return ret; 1047aca69f9SLiam Girdwood 1057aca69f9SLiam Girdwood ret = snd_soc_register_platform(&pdev->dev, &dummy_platform); 1067aca69f9SLiam Girdwood if (ret < 0) { 1077aca69f9SLiam Girdwood snd_soc_unregister_codec(&pdev->dev); 1087aca69f9SLiam Girdwood return ret; 1097aca69f9SLiam Girdwood } 1107aca69f9SLiam Girdwood 1117aca69f9SLiam Girdwood return ret; 112848dd8beSMark Brown } 113848dd8beSMark Brown 114*e51e97eeSBill Pemberton static int snd_soc_dummy_remove(struct platform_device *pdev) 115848dd8beSMark Brown { 116848dd8beSMark Brown snd_soc_unregister_platform(&pdev->dev); 1177aca69f9SLiam Girdwood snd_soc_unregister_codec(&pdev->dev); 118848dd8beSMark Brown 119848dd8beSMark Brown return 0; 120848dd8beSMark Brown } 121848dd8beSMark Brown 122848dd8beSMark Brown static struct platform_driver soc_dummy_driver = { 123848dd8beSMark Brown .driver = { 124848dd8beSMark Brown .name = "snd-soc-dummy", 125848dd8beSMark Brown .owner = THIS_MODULE, 126848dd8beSMark Brown }, 127848dd8beSMark Brown .probe = snd_soc_dummy_probe, 128*e51e97eeSBill Pemberton .remove = snd_soc_dummy_remove, 129848dd8beSMark Brown }; 130848dd8beSMark Brown 131848dd8beSMark Brown static struct platform_device *soc_dummy_dev; 132848dd8beSMark Brown 133fb257897SMark Brown int __init snd_soc_util_init(void) 134848dd8beSMark Brown { 135848dd8beSMark Brown int ret; 136848dd8beSMark Brown 137848dd8beSMark Brown soc_dummy_dev = platform_device_alloc("snd-soc-dummy", -1); 138848dd8beSMark Brown if (!soc_dummy_dev) 139848dd8beSMark Brown return -ENOMEM; 140848dd8beSMark Brown 141848dd8beSMark Brown ret = platform_device_add(soc_dummy_dev); 142848dd8beSMark Brown if (ret != 0) { 143848dd8beSMark Brown platform_device_put(soc_dummy_dev); 144848dd8beSMark Brown return ret; 145848dd8beSMark Brown } 146848dd8beSMark Brown 147848dd8beSMark Brown ret = platform_driver_register(&soc_dummy_driver); 148848dd8beSMark Brown if (ret != 0) 149848dd8beSMark Brown platform_device_unregister(soc_dummy_dev); 150848dd8beSMark Brown 151848dd8beSMark Brown return ret; 152848dd8beSMark Brown } 153848dd8beSMark Brown 154fb257897SMark Brown void __exit snd_soc_util_exit(void) 155848dd8beSMark Brown { 156848dd8beSMark Brown platform_device_unregister(soc_dummy_dev); 157848dd8beSMark Brown platform_driver_unregister(&soc_dummy_driver); 158848dd8beSMark Brown } 159