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Linux/sound/soc/soc-utils.c

  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         /* Random values to keep userspace happy when checking constraints */
 63         .info                   = SNDRV_PCM_INFO_INTERLEAVED |
 64                                   SNDRV_PCM_INFO_BLOCK_TRANSFER,
 65         .buffer_bytes_max       = 128*1024,
 66         .period_bytes_min       = PAGE_SIZE,
 67         .period_bytes_max       = PAGE_SIZE*2,
 68         .periods_min            = 2,
 69         .periods_max            = 128,
 70 };
 71 
 72 static int dummy_dma_open(struct snd_pcm_substream *substream)
 73 {
 74         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 75 
 76         /* BE's dont need dummy params */
 77         if (!rtd->dai_link->no_pcm)
 78                 snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);
 79 
 80         return 0;
 81 }
 82 
 83 static struct snd_pcm_ops dummy_dma_ops = {
 84         .open           = dummy_dma_open,
 85         .ioctl          = snd_pcm_lib_ioctl,
 86 };
 87 
 88 static struct snd_soc_platform_driver dummy_platform = {
 89         .ops = &dummy_dma_ops,
 90 };
 91 
 92 static struct snd_soc_codec_driver dummy_codec;
 93 
 94 #define STUB_RATES      SNDRV_PCM_RATE_8000_192000
 95 #define STUB_FORMATS    (SNDRV_PCM_FMTBIT_S8 | \
 96                         SNDRV_PCM_FMTBIT_U8 | \
 97                         SNDRV_PCM_FMTBIT_S16_LE | \
 98                         SNDRV_PCM_FMTBIT_U16_LE | \
 99                         SNDRV_PCM_FMTBIT_S24_LE | \
100                         SNDRV_PCM_FMTBIT_U24_LE | \
101                         SNDRV_PCM_FMTBIT_S32_LE | \
102                         SNDRV_PCM_FMTBIT_U32_LE | \
103                         SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
104 /*
105  * The dummy CODEC is only meant to be used in situations where there is no
106  * actual hardware.
107  *
108  * If there is actual hardware even if it does not have a control bus
109  * the hardware will still have constraints like supported samplerates, etc.
110  * which should be modelled. And the data flow graph also should be modelled
111  * using DAPM.
112  */
113 static struct snd_soc_dai_driver dummy_dai = {
114         .name = "snd-soc-dummy-dai",
115         .playback = {
116                 .stream_name    = "Playback",
117                 .channels_min   = 1,
118                 .channels_max   = 384,
119                 .rates          = STUB_RATES,
120                 .formats        = STUB_FORMATS,
121         },
122         .capture = {
123                 .stream_name    = "Capture",
124                 .channels_min   = 1,
125                 .channels_max   = 384,
126                 .rates = STUB_RATES,
127                 .formats = STUB_FORMATS,
128          },
129 };
130 
131 int snd_soc_dai_is_dummy(struct snd_soc_dai *dai)
132 {
133         if (dai->driver == &dummy_dai)
134                 return 1;
135         return 0;
136 }
137 
138 static int snd_soc_dummy_probe(struct platform_device *pdev)
139 {
140         int ret;
141 
142         ret = snd_soc_register_codec(&pdev->dev, &dummy_codec, &dummy_dai, 1);
143         if (ret < 0)
144                 return ret;
145 
146         ret = snd_soc_register_platform(&pdev->dev, &dummy_platform);
147         if (ret < 0) {
148                 snd_soc_unregister_codec(&pdev->dev);
149                 return ret;
150         }
151 
152         return ret;
153 }
154 
155 static int snd_soc_dummy_remove(struct platform_device *pdev)
156 {
157         snd_soc_unregister_platform(&pdev->dev);
158         snd_soc_unregister_codec(&pdev->dev);
159 
160         return 0;
161 }
162 
163 static struct platform_driver soc_dummy_driver = {
164         .driver = {
165                 .name = "snd-soc-dummy",
166         },
167         .probe = snd_soc_dummy_probe,
168         .remove = snd_soc_dummy_remove,
169 };
170 
171 static struct platform_device *soc_dummy_dev;
172 
173 int __init snd_soc_util_init(void)
174 {
175         int ret;
176 
177         soc_dummy_dev =
178                 platform_device_register_simple("snd-soc-dummy", -1, NULL, 0);
179         if (IS_ERR(soc_dummy_dev))
180                 return PTR_ERR(soc_dummy_dev);
181 
182         ret = platform_driver_register(&soc_dummy_driver);
183         if (ret != 0)
184                 platform_device_unregister(soc_dummy_dev);
185 
186         return ret;
187 }
188 
189 void __exit snd_soc_util_exit(void)
190 {
191         platform_device_unregister(soc_dummy_dev);
192         platform_driver_unregister(&soc_dummy_driver);
193 }
194 

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