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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 | /* * soc-util.c -- ALSA SoC Audio Layer utility functions * * Copyright 2009 Wolfson Microelectronics PLC. * * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> * Liam Girdwood <lrg@slimlogic.co.uk> * * * 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 <linux/platform_device.h> #include <linux/export.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/soc.h> 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; sample_size = snd_pcm_format_width(params_format(params)); if (sample_size < 0) return sample_size; return snd_soc_calc_frame_size(sample_size, params_channels(params), 1); } 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; 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); static const struct snd_pcm_hardware dummy_dma_hardware = { .formats = 0xffffffff, .channels_min = 1, .channels_max = UINT_MAX, /* Random values to keep userspace happy when checking constraints */ .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER, .buffer_bytes_max = 128*1024, .period_bytes_min = PAGE_SIZE, .period_bytes_max = PAGE_SIZE*2, .periods_min = 2, .periods_max = 128, }; static int dummy_dma_open(struct snd_pcm_substream *substream) { snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware); return 0; } static struct snd_pcm_ops dummy_dma_ops = { .open = dummy_dma_open, .ioctl = snd_pcm_lib_ioctl, }; static struct snd_soc_platform_driver dummy_platform = { .ops = &dummy_dma_ops, }; static struct snd_soc_codec_driver dummy_codec; static struct snd_soc_dai_driver dummy_dai = { .name = "snd-soc-dummy-dai", }; static __devinit int snd_soc_dummy_probe(struct platform_device *pdev) { int ret; ret = snd_soc_register_codec(&pdev->dev, &dummy_codec, &dummy_dai, 1); if (ret < 0) return ret; ret = snd_soc_register_platform(&pdev->dev, &dummy_platform); if (ret < 0) { snd_soc_unregister_codec(&pdev->dev); return ret; } return ret; } static __devexit int snd_soc_dummy_remove(struct platform_device *pdev) { snd_soc_unregister_platform(&pdev->dev); snd_soc_unregister_codec(&pdev->dev); return 0; } static struct platform_driver soc_dummy_driver = { .driver = { .name = "snd-soc-dummy", .owner = THIS_MODULE, }, .probe = snd_soc_dummy_probe, .remove = __devexit_p(snd_soc_dummy_remove), }; static struct platform_device *soc_dummy_dev; int __init snd_soc_util_init(void) { int ret; soc_dummy_dev = platform_device_alloc("snd-soc-dummy", -1); if (!soc_dummy_dev) return -ENOMEM; ret = platform_device_add(soc_dummy_dev); if (ret != 0) { platform_device_put(soc_dummy_dev); return ret; } ret = platform_driver_register(&soc_dummy_driver); if (ret != 0) platform_device_unregister(soc_dummy_dev); return ret; } void __exit snd_soc_util_exit(void) { platform_device_unregister(soc_dummy_dev); platform_driver_unregister(&soc_dummy_driver); } |