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 <linux/export.h> 18 #include <sound/core.h> 19 #include <sound/pcm.h> 20 #include <sound/pcm_params.h> 21 #include <sound/soc.h> 22 23 int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots) 24 { 25 return sample_size * channels * tdm_slots; 26 } 27 EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size); 28 29 int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params) 30 { 31 int sample_size; 32 33 sample_size = snd_pcm_format_width(params_format(params)); 34 if (sample_size < 0) 35 return sample_size; 36 37 return snd_soc_calc_frame_size(sample_size, params_channels(params), 38 1); 39 } 40 EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size); 41 42 int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots) 43 { 44 return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots); 45 } 46 EXPORT_SYMBOL_GPL(snd_soc_calc_bclk); 47 48 int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params) 49 { 50 int ret; 51 52 ret = snd_soc_params_to_frame_size(params); 53 54 if (ret > 0) 55 return ret * params_rate(params); 56 else 57 return ret; 58 } 59 EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk); 60 61 static const struct snd_pcm_hardware dummy_dma_hardware = { 62 .formats = 0xffffffff, 63 .channels_min = 1, 64 .channels_max = UINT_MAX, 65 66 /* Random values to keep userspace happy when checking constraints */ 67 .info = SNDRV_PCM_INFO_INTERLEAVED | 68 SNDRV_PCM_INFO_BLOCK_TRANSFER, 69 .buffer_bytes_max = 128*1024, 70 .period_bytes_min = PAGE_SIZE, 71 .period_bytes_max = PAGE_SIZE*2, 72 .periods_min = 2, 73 .periods_max = 128, 74 }; 75 76 static int dummy_dma_open(struct snd_pcm_substream *substream) 77 { 78 struct snd_soc_pcm_runtime *rtd = substream->private_data; 79 80 /* BE's dont need dummy params */ 81 if (!rtd->dai_link->no_pcm) 82 snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware); 83 84 return 0; 85 } 86 87 static struct snd_pcm_ops dummy_dma_ops = { 88 .open = dummy_dma_open, 89 .ioctl = snd_pcm_lib_ioctl, 90 }; 91 92 static struct snd_soc_platform_driver dummy_platform = { 93 .ops = &dummy_dma_ops, 94 }; 95 96 static struct snd_soc_codec_driver dummy_codec; 97 98 #define STUB_RATES SNDRV_PCM_RATE_8000_192000 99 #define STUB_FORMATS (SNDRV_PCM_FMTBIT_S8 | \ 100 SNDRV_PCM_FMTBIT_U8 | \ 101 SNDRV_PCM_FMTBIT_S16_LE | \ 102 SNDRV_PCM_FMTBIT_U16_LE | \ 103 SNDRV_PCM_FMTBIT_S24_LE | \ 104 SNDRV_PCM_FMTBIT_U24_LE | \ 105 SNDRV_PCM_FMTBIT_S32_LE | \ 106 SNDRV_PCM_FMTBIT_U32_LE | \ 107 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE) 108 static struct snd_soc_dai_driver dummy_dai = { 109 .name = "snd-soc-dummy-dai", 110 .playback = { 111 .stream_name = "Playback", 112 .channels_min = 1, 113 .channels_max = 384, 114 .rates = STUB_RATES, 115 .formats = STUB_FORMATS, 116 }, 117 .capture = { 118 .stream_name = "Capture", 119 .channels_min = 1, 120 .channels_max = 384, 121 .rates = STUB_RATES, 122 .formats = STUB_FORMATS, 123 }, 124 }; 125 126 static int snd_soc_dummy_probe(struct platform_device *pdev) 127 { 128 int ret; 129 130 ret = snd_soc_register_codec(&pdev->dev, &dummy_codec, &dummy_dai, 1); 131 if (ret < 0) 132 return ret; 133 134 ret = snd_soc_register_platform(&pdev->dev, &dummy_platform); 135 if (ret < 0) { 136 snd_soc_unregister_codec(&pdev->dev); 137 return ret; 138 } 139 140 return ret; 141 } 142 143 static int snd_soc_dummy_remove(struct platform_device *pdev) 144 { 145 snd_soc_unregister_platform(&pdev->dev); 146 snd_soc_unregister_codec(&pdev->dev); 147 148 return 0; 149 } 150 151 static struct platform_driver soc_dummy_driver = { 152 .driver = { 153 .name = "snd-soc-dummy", 154 .owner = THIS_MODULE, 155 }, 156 .probe = snd_soc_dummy_probe, 157 .remove = snd_soc_dummy_remove, 158 }; 159 160 static struct platform_device *soc_dummy_dev; 161 162 int __init snd_soc_util_init(void) 163 { 164 int ret; 165 166 soc_dummy_dev = 167 platform_device_register_simple("snd-soc-dummy", -1, NULL, 0); 168 if (IS_ERR(soc_dummy_dev)) 169 return PTR_ERR(soc_dummy_dev); 170 171 ret = platform_driver_register(&soc_dummy_driver); 172 if (ret != 0) 173 platform_device_unregister(soc_dummy_dev); 174 175 return ret; 176 } 177 178 void __exit snd_soc_util_exit(void) 179 { 180 platform_device_unregister(soc_dummy_dev); 181 platform_driver_unregister(&soc_dummy_driver); 182 } 183