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 = substream->private_data; 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_192000 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_U24_LE | \ 96 SNDRV_PCM_FMTBIT_S32_LE | \ 97 SNDRV_PCM_FMTBIT_U32_LE | \ 98 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE) 99 /* 100 * The dummy CODEC is only meant to be used in situations where there is no 101 * actual hardware. 102 * 103 * If there is actual hardware even if it does not have a control bus 104 * the hardware will still have constraints like supported samplerates, etc. 105 * which should be modelled. And the data flow graph also should be modelled 106 * using DAPM. 107 */ 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 int snd_soc_dai_is_dummy(struct snd_soc_dai *dai) 127 { 128 if (dai->driver == &dummy_dai) 129 return 1; 130 return 0; 131 } 132 133 static int snd_soc_dummy_probe(struct platform_device *pdev) 134 { 135 int ret; 136 137 ret = devm_snd_soc_register_component(&pdev->dev, 138 &dummy_codec, &dummy_dai, 1); 139 if (ret < 0) 140 return ret; 141 142 ret = devm_snd_soc_register_component(&pdev->dev, &dummy_platform, 143 NULL, 0); 144 145 return ret; 146 } 147 148 static struct platform_driver soc_dummy_driver = { 149 .driver = { 150 .name = "snd-soc-dummy", 151 }, 152 .probe = snd_soc_dummy_probe, 153 }; 154 155 static struct platform_device *soc_dummy_dev; 156 157 int __init snd_soc_util_init(void) 158 { 159 int ret; 160 161 soc_dummy_dev = 162 platform_device_register_simple("snd-soc-dummy", -1, NULL, 0); 163 if (IS_ERR(soc_dummy_dev)) 164 return PTR_ERR(soc_dummy_dev); 165 166 ret = platform_driver_register(&soc_dummy_driver); 167 if (ret != 0) 168 platform_device_unregister(soc_dummy_dev); 169 170 return ret; 171 } 172 173 void __exit snd_soc_util_exit(void) 174 { 175 platform_driver_unregister(&soc_dummy_driver); 176 platform_device_unregister(soc_dummy_dev); 177 } 178