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 <linux/platform_device.h> 17 #include <sound/core.h> 18 #include <sound/pcm.h> 19 #include <sound/pcm_params.h> 20 #include <sound/soc.h> 21 22 int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots) 23 { 24 return sample_size * channels * tdm_slots; 25 } 26 EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size); 27 28 int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params) 29 { 30 int sample_size; 31 32 sample_size = snd_pcm_format_width(params_format(params)); 33 if (sample_size < 0) 34 return sample_size; 35 36 return snd_soc_calc_frame_size(sample_size, params_channels(params), 37 1); 38 } 39 EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size); 40 41 int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots) 42 { 43 return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots); 44 } 45 EXPORT_SYMBOL_GPL(snd_soc_calc_bclk); 46 47 int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params) 48 { 49 int ret; 50 51 ret = snd_soc_params_to_frame_size(params); 52 53 if (ret > 0) 54 return ret * params_rate(params); 55 else 56 return ret; 57 } 58 EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk); 59 60 static struct snd_soc_platform_driver dummy_platform; 61 62 static __devinit int snd_soc_dummy_probe(struct platform_device *pdev) 63 { 64 return snd_soc_register_platform(&pdev->dev, &dummy_platform); 65 } 66 67 static __devexit int snd_soc_dummy_remove(struct platform_device *pdev) 68 { 69 snd_soc_unregister_platform(&pdev->dev); 70 71 return 0; 72 } 73 74 static struct platform_driver soc_dummy_driver = { 75 .driver = { 76 .name = "snd-soc-dummy", 77 .owner = THIS_MODULE, 78 }, 79 .probe = snd_soc_dummy_probe, 80 .remove = __devexit_p(snd_soc_dummy_remove), 81 }; 82 83 static struct platform_device *soc_dummy_dev; 84 85 int __init snd_soc_util_init(void) 86 { 87 int ret; 88 89 soc_dummy_dev = platform_device_alloc("snd-soc-dummy", -1); 90 if (!soc_dummy_dev) 91 return -ENOMEM; 92 93 ret = platform_device_add(soc_dummy_dev); 94 if (ret != 0) { 95 platform_device_put(soc_dummy_dev); 96 return ret; 97 } 98 99 ret = platform_driver_register(&soc_dummy_driver); 100 if (ret != 0) 101 platform_device_unregister(soc_dummy_dev); 102 103 return ret; 104 } 105 106 void __exit snd_soc_util_exit(void) 107 { 108 platform_device_unregister(soc_dummy_dev); 109 platform_driver_unregister(&soc_dummy_driver); 110 } 111