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_pcm_substream *substream) 67 { 68 struct snd_soc_pcm_runtime *rtd = substream->private_data; 69 70 /* BE's dont need dummy params */ 71 if (!rtd->dai_link->no_pcm) 72 snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware); 73 74 return 0; 75 } 76 77 static const struct snd_pcm_ops snd_dummy_dma_ops = { 78 .open = dummy_dma_open, 79 .ioctl = snd_pcm_lib_ioctl, 80 }; 81 82 static const struct snd_soc_component_driver dummy_platform = { 83 .ops = &snd_dummy_dma_ops, 84 }; 85 86 static const struct snd_soc_component_driver dummy_codec = { 87 .idle_bias_on = 1, 88 .use_pmdown_time = 1, 89 .endianness = 1, 90 .non_legacy_dai_naming = 1, 91 }; 92 93 #define STUB_RATES SNDRV_PCM_RATE_8000_192000 94 #define STUB_FORMATS (SNDRV_PCM_FMTBIT_S8 | \ 95 SNDRV_PCM_FMTBIT_U8 | \ 96 SNDRV_PCM_FMTBIT_S16_LE | \ 97 SNDRV_PCM_FMTBIT_U16_LE | \ 98 SNDRV_PCM_FMTBIT_S24_LE | \ 99 SNDRV_PCM_FMTBIT_U24_LE | \ 100 SNDRV_PCM_FMTBIT_S32_LE | \ 101 SNDRV_PCM_FMTBIT_U32_LE | \ 102 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE) 103 /* 104 * The dummy CODEC is only meant to be used in situations where there is no 105 * actual hardware. 106 * 107 * If there is actual hardware even if it does not have a control bus 108 * the hardware will still have constraints like supported samplerates, etc. 109 * which should be modelled. And the data flow graph also should be modelled 110 * using DAPM. 111 */ 112 static struct snd_soc_dai_driver dummy_dai = { 113 .name = "snd-soc-dummy-dai", 114 .playback = { 115 .stream_name = "Playback", 116 .channels_min = 1, 117 .channels_max = 384, 118 .rates = STUB_RATES, 119 .formats = STUB_FORMATS, 120 }, 121 .capture = { 122 .stream_name = "Capture", 123 .channels_min = 1, 124 .channels_max = 384, 125 .rates = STUB_RATES, 126 .formats = STUB_FORMATS, 127 }, 128 }; 129 130 int snd_soc_dai_is_dummy(struct snd_soc_dai *dai) 131 { 132 if (dai->driver == &dummy_dai) 133 return 1; 134 return 0; 135 } 136 137 static int snd_soc_dummy_probe(struct platform_device *pdev) 138 { 139 int ret; 140 141 ret = devm_snd_soc_register_component(&pdev->dev, 142 &dummy_codec, &dummy_dai, 1); 143 if (ret < 0) 144 return ret; 145 146 ret = devm_snd_soc_register_component(&pdev->dev, &dummy_platform, 147 NULL, 0); 148 149 return ret; 150 } 151 152 static struct platform_driver soc_dummy_driver = { 153 .driver = { 154 .name = "snd-soc-dummy", 155 }, 156 .probe = snd_soc_dummy_probe, 157 }; 158 159 static struct platform_device *soc_dummy_dev; 160 161 int __init snd_soc_util_init(void) 162 { 163 int ret; 164 165 soc_dummy_dev = 166 platform_device_register_simple("snd-soc-dummy", -1, NULL, 0); 167 if (IS_ERR(soc_dummy_dev)) 168 return PTR_ERR(soc_dummy_dev); 169 170 ret = platform_driver_register(&soc_dummy_driver); 171 if (ret != 0) 172 platform_device_unregister(soc_dummy_dev); 173 174 return ret; 175 } 176 177 void __exit snd_soc_util_exit(void) 178 { 179 platform_driver_unregister(&soc_dummy_driver); 180 platform_device_unregister(soc_dummy_dev); 181 } 182