sound/soc/intel/boards/bytcht_nocodec.c

   1 /*
   2  *  bytcht_nocodec.c - ASoc Machine driver for MinnowBoard Max and Up
   3  *  to make I2S signals observable on the Low-Speed connector. Audio codec
   4  *  is not managed by ASoC/DAPM
   5  *
   6  *  Copyright (C) 2015-2017 Intel Corp
   7  *
   8  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; version 2 of the License.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  20  */
  21
  22 #include <linux/module.h>
  23 #include <sound/pcm.h>
  24 #include <sound/pcm_params.h>
  25 #include <sound/soc.h>
  26 #include "../atom/sst-atom-controls.h"
  27
  28 static const struct snd_soc_dapm_widget widgets[] = {
  29         SND_SOC_DAPM_MIC("Mic", NULL),
  30         SND_SOC_DAPM_SPK("Speaker", NULL),
  31 };
  32
  33 static const struct snd_kcontrol_new controls[] = {
  34         SOC_DAPM_PIN_SWITCH("Mic"),
  35         SOC_DAPM_PIN_SWITCH("Speaker"),
  36 };
  37
  38 static const struct snd_soc_dapm_route audio_map[] = {
  39         {"ssp2 Tx", NULL, "codec_out0"},
  40         {"ssp2 Tx", NULL, "codec_out1"},
  41         {"codec_in0", NULL, "ssp2 Rx"},
  42         {"codec_in1", NULL, "ssp2 Rx"},
  43
  44         {"ssp2 Rx", NULL, "Mic"},
  45         {"Speaker", NULL, "ssp2 Tx"},
  46 };
  47
  48 static int codec_fixup(struct snd_soc_pcm_runtime *rtd,
  49                             struct snd_pcm_hw_params *params)
  50 {
  51         struct snd_interval *rate = hw_param_interval(params,
  52                         SNDRV_PCM_HW_PARAM_RATE);
  53         struct snd_interval *channels = hw_param_interval(params,
  54                                                 SNDRV_PCM_HW_PARAM_CHANNELS);
  55         int ret;
  56
  57         /* The DSP will convert the FE rate to 48k, stereo, 24bits */
  58         rate->min = rate->max = 48000;
  59         channels->min = channels->max = 2;
  60
  61         /* set SSP2 to 24-bit */
  62         params_set_format(params, SNDRV_PCM_FORMAT_S24_LE);
  63
  64         /*
  65          * Default mode for SSP configuration is TDM 4 slot, override config
  66          * with explicit setting to I2S 2ch 24-bit. The word length is set with
  67          * dai_set_tdm_slot() since there is no other API exposed
  68          */
  69         ret = snd_soc_dai_set_fmt(rtd->cpu_dai,
  70                                   SND_SOC_DAIFMT_I2S     |
  71                                   SND_SOC_DAIFMT_NB_NF   |
  72                                   SND_SOC_DAIFMT_CBS_CFS);
  73
  74         if (ret < 0) {
  75                 dev_err(rtd->dev, "can't set format to I2S, err %d\n", ret);
  76                 return ret;
  77         }
  78
  79         ret = snd_soc_dai_set_tdm_slot(rtd->cpu_dai, 0x3, 0x3, 2, 24);
  80         if (ret < 0) {
  81                 dev_err(rtd->dev, "can't set I2S config, err %d\n", ret);
  82                 return ret;
  83         }
  84
  85         return 0;
  86 }
  87
  88 static const unsigned int rates_48000[] = {
  89         48000,
  90 };
  91
  92 static const struct snd_pcm_hw_constraint_list constraints_48000 = {
  93         .count = ARRAY_SIZE(rates_48000),
  94         .list  = rates_48000,
  95 };
  96
  97 static int aif1_startup(struct snd_pcm_substream *substream)
  98 {
  99         return snd_pcm_hw_constraint_list(substream->runtime, 0,
 100                         SNDRV_PCM_HW_PARAM_RATE,
 101                         &constraints_48000);
 102 }
 103
 104 static struct snd_soc_ops aif1_ops = {
 105         .startup = aif1_startup,
 106 };
 107
 108 static struct snd_soc_dai_link dais[] = {
 109         [MERR_DPCM_AUDIO] = {
 110                 .name = "Audio Port",
 111                 .stream_name = "Audio",
 112                 .cpu_dai_name = "media-cpu-dai",
 113                 .codec_dai_name = "snd-soc-dummy-dai",
 114                 .codec_name = "snd-soc-dummy",
 115                 .platform_name = "sst-mfld-platform",
 116                 .ignore_suspend = 1,
 117                 .nonatomic = true,
 118                 .dynamic = 1,
 119                 .dpcm_playback = 1,
 120                 .dpcm_capture = 1,
 121                 .ops = &aif1_ops,
 122         },
 123         [MERR_DPCM_DEEP_BUFFER] = {
 124                 .name = "Deep-Buffer Audio Port",
 125                 .stream_name = "Deep-Buffer Audio",
 126                 .cpu_dai_name = "deepbuffer-cpu-dai",
 127                 .codec_dai_name = "snd-soc-dummy-dai",
 128                 .codec_name = "snd-soc-dummy",
 129                 .platform_name = "sst-mfld-platform",
 130                 .ignore_suspend = 1,
 131                 .nonatomic = true,
 132                 .dynamic = 1,
 133                 .dpcm_playback = 1,
 134                 .ops = &aif1_ops,
 135         },
 136         /* CODEC<->CODEC link */
 137         /* back ends */
 138         {
 139                 .name = "SSP2-LowSpeed Connector",
 140                 .id = 0,
 141                 .cpu_dai_name = "ssp2-port",
 142                 .platform_name = "sst-mfld-platform",
 143                 .no_pcm = 1,
 144                 .codec_dai_name = "snd-soc-dummy-dai",
 145                 .codec_name = "snd-soc-dummy",
 146                 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
 147                                                 | SND_SOC_DAIFMT_CBS_CFS,
 148                 .be_hw_params_fixup = codec_fixup,
 149                 .ignore_suspend = 1,
 150                 .nonatomic = true,
 151                 .dpcm_playback = 1,
 152                 .dpcm_capture = 1,
 153         },
 154 };
 155
 156 /* SoC card */
 157 static struct snd_soc_card bytcht_nocodec_card = {
 158         .name = "bytcht-nocodec",
 159         .owner = THIS_MODULE,
 160         .dai_link = dais,
 161         .num_links = ARRAY_SIZE(dais),
 162         .dapm_widgets = widgets,
 163         .num_dapm_widgets = ARRAY_SIZE(widgets),
 164         .dapm_routes = audio_map,
 165         .num_dapm_routes = ARRAY_SIZE(audio_map),
 166         .controls = controls,
 167         .num_controls = ARRAY_SIZE(controls),
 168         .fully_routed = true,
 169 };
 170
 171 static int snd_bytcht_nocodec_mc_probe(struct platform_device *pdev)
 172 {
 173         int ret_val = 0;
 174
 175         /* register the soc card */
 176         bytcht_nocodec_card.dev = &pdev->dev;
 177
 178         ret_val = devm_snd_soc_register_card(&pdev->dev, &bytcht_nocodec_card);
 179
 180         if (ret_val) {
 181                 dev_err(&pdev->dev, "devm_snd_soc_register_card failed %d\n",
 182                         ret_val);
 183                 return ret_val;
 184         }
 185         platform_set_drvdata(pdev, &bytcht_nocodec_card);
 186         return ret_val;
 187 }
 188
 189 static struct platform_driver snd_bytcht_nocodec_mc_driver = {
 190         .driver = {
 191                 .name = "bytcht_nocodec",
 192         },
 193         .probe = snd_bytcht_nocodec_mc_probe,
 194 };
 195 module_platform_driver(snd_bytcht_nocodec_mc_driver);
 196
 197 MODULE_DESCRIPTION("ASoC Intel(R) Baytrail/Cherrytrail Nocodec Machine driver");
 198 MODULE_AUTHOR("Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>");
 199 MODULE_LICENSE("GPL v2");
 200 MODULE_ALIAS("platform:bytcht_nocodec");