1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // soc-util.c -- ALSA SoC Audio Layer utility functions 4 // 5 // Copyright 2009 Wolfson Microelectronics PLC. 6 // 7 // Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 8 // Liam Girdwood <lrg@slimlogic.co.uk> 9 10 #include <linux/platform_device.h> 11 #include <linux/export.h> 12 #include <sound/core.h> 13 #include <sound/pcm.h> 14 #include <sound/pcm_params.h> 15 #include <sound/soc.h> 16 17 int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots) 18 { 19 return sample_size * channels * tdm_slots; 20 } 21 EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size); 22 23 int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params) 24 { 25 int sample_size; 26 27 sample_size = snd_pcm_format_width(params_format(params)); 28 if (sample_size < 0) 29 return sample_size; 30 31 return snd_soc_calc_frame_size(sample_size, params_channels(params), 32 1); 33 } 34 EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size); 35 36 int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots) 37 { 38 return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots); 39 } 40 EXPORT_SYMBOL_GPL(snd_soc_calc_bclk); 41 42 int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params) 43 { 44 int ret; 45 46 ret = snd_soc_params_to_frame_size(params); 47 48 if (ret > 0) 49 return ret * params_rate(params); 50 else 51 return ret; 52 } 53 EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk); 54 55 static const struct snd_pcm_hardware dummy_dma_hardware = { 56 /* Random values to keep userspace happy when checking constraints */ 57 .info = SNDRV_PCM_INFO_INTERLEAVED | 58 SNDRV_PCM_INFO_BLOCK_TRANSFER, 59 .buffer_bytes_max = 128*1024, 60 .period_bytes_min = PAGE_SIZE, 61 .period_bytes_max = PAGE_SIZE*2, 62 .periods_min = 2, 63 .periods_max = 128, 64 }; 65 66 static int dummy_dma_open(struct snd_soc_component *component, 67 struct snd_pcm_substream *substream) 68 { 69 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 70 71 /* BE's dont need dummy params */ 72 if (!rtd->dai_link->no_pcm) 73 snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware); 74 75 return 0; 76 } 77 78 static const struct snd_soc_component_driver dummy_platform = { 79 .open = dummy_dma_open, 80 }; 81 82 static const struct snd_soc_component_driver dummy_codec = { 83 .idle_bias_on = 1, 84 .use_pmdown_time = 1, 85 .endianness = 1, 86 .non_legacy_dai_naming = 1, 87 }; 88 89 #define STUB_RATES SNDRV_PCM_RATE_8000_384000 90 #define STUB_FORMATS (SNDRV_PCM_FMTBIT_S8 | \ 91 SNDRV_PCM_FMTBIT_U8 | \ 92 SNDRV_PCM_FMTBIT_S16_LE | \ 93 SNDRV_PCM_FMTBIT_U16_LE | \ 94 SNDRV_PCM_FMTBIT_S24_LE | \ 95 SNDRV_PCM_FMTBIT_S24_3LE | \ 96 SNDRV_PCM_FMTBIT_U24_LE | \ 97 SNDRV_PCM_FMTBIT_S32_LE | \ 98 SNDRV_PCM_FMTBIT_U32_LE | \ 99 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE) 100 /* 101 * The dummy CODEC is only meant to be used in situations where there is no 102 * actual hardware. 103 * 104 * If there is actual hardware even if it does not have a control bus 105 * the hardware will still have constraints like supported samplerates, etc. 106 * which should be modelled. And the data flow graph also should be modelled 107 * using DAPM. 108 */ 109 static struct snd_soc_dai_driver dummy_dai = { 110 .name = "snd-soc-dummy-dai", 111 .playback = { 112 .stream_name = "Playback", 113 .channels_min = 1, 114 .channels_max = 384, 115 .rates = STUB_RATES, 116 .formats = STUB_FORMATS, 117 }, 118 .capture = { 119 .stream_name = "Capture", 120 .channels_min = 1, 121 .channels_max = 384, 122 .rates = STUB_RATES, 123 .formats = STUB_FORMATS, 124 }, 125 }; 126 127 int snd_soc_dai_is_dummy(struct snd_soc_dai *dai) 128 { 129 if (dai->driver == &dummy_dai) 130 return 1; 131 return 0; 132 } 133 134 static int snd_soc_dummy_probe(struct platform_device *pdev) 135 { 136 int ret; 137 138 ret = devm_snd_soc_register_component(&pdev->dev, 139 &dummy_codec, &dummy_dai, 1); 140 if (ret < 0) 141 return ret; 142 143 ret = devm_snd_soc_register_component(&pdev->dev, &dummy_platform, 144 NULL, 0); 145 146 return ret; 147 } 148 149 static struct platform_driver soc_dummy_driver = { 150 .driver = { 151 .name = "snd-soc-dummy", 152 }, 153 .probe = snd_soc_dummy_probe, 154 }; 155 156 static struct platform_device *soc_dummy_dev; 157 158 int __init snd_soc_util_init(void) 159 { 160 int ret; 161 162 soc_dummy_dev = 163 platform_device_register_simple("snd-soc-dummy", -1, NULL, 0); 164 if (IS_ERR(soc_dummy_dev)) 165 return PTR_ERR(soc_dummy_dev); 166 167 ret = platform_driver_register(&soc_dummy_driver); 168 if (ret != 0) 169 platform_device_unregister(soc_dummy_dev); 170 171 return ret; 172 } 173 174 void __exit snd_soc_util_exit(void) 175 { 176 platform_driver_unregister(&soc_dummy_driver); 177 platform_device_unregister(soc_dummy_dev); 178 } 179