linux/sound/soc/intel/boards/bytcht_nocodec.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  bytcht_nocodec.c - ASoc Machine driver for MinnowBoard Max and Up
   4 *  to make I2S signals observable on the Low-Speed connector. Audio codec
   5 *  is not managed by ASoC/DAPM
   6 *
   7 *  Copyright (C) 2015-2017 Intel Corp
   8 *
   9 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  10 *
  11 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  12 */
  13
  14#include <linux/module.h>
  15#include <sound/pcm.h>
  16#include <sound/pcm_params.h>
  17#include <sound/soc.h>
  18#include "../atom/sst-atom-controls.h"
  19
  20static const struct snd_soc_dapm_widget widgets[] = {
  21        SND_SOC_DAPM_MIC("Mic", NULL),
  22        SND_SOC_DAPM_SPK("Speaker", NULL),
  23};
  24
  25static const struct snd_kcontrol_new controls[] = {
  26        SOC_DAPM_PIN_SWITCH("Mic"),
  27        SOC_DAPM_PIN_SWITCH("Speaker"),
  28};
  29
  30static const struct snd_soc_dapm_route audio_map[] = {
  31        {"ssp2 Tx", NULL, "codec_out0"},
  32        {"ssp2 Tx", NULL, "codec_out1"},
  33        {"codec_in0", NULL, "ssp2 Rx"},
  34        {"codec_in1", NULL, "ssp2 Rx"},
  35
  36        {"ssp2 Rx", NULL, "Mic"},
  37        {"Speaker", NULL, "ssp2 Tx"},
  38};
  39
  40static int codec_fixup(struct snd_soc_pcm_runtime *rtd,
  41                            struct snd_pcm_hw_params *params)
  42{
  43        struct snd_interval *rate = hw_param_interval(params,
  44                        SNDRV_PCM_HW_PARAM_RATE);
  45        struct snd_interval *channels = hw_param_interval(params,
  46                                                SNDRV_PCM_HW_PARAM_CHANNELS);
  47        int ret;
  48
  49        /* The DSP will convert the FE rate to 48k, stereo, 24bits */
  50        rate->min = rate->max = 48000;
  51        channels->min = channels->max = 2;
  52
  53        /* set SSP2 to 24-bit */
  54        params_set_format(params, SNDRV_PCM_FORMAT_S24_LE);
  55
  56        /*
  57         * Default mode for SSP configuration is TDM 4 slot, override config
  58         * with explicit setting to I2S 2ch 24-bit. The word length is set with
  59         * dai_set_tdm_slot() since there is no other API exposed
  60         */
  61        ret = snd_soc_dai_set_fmt(asoc_rtd_to_cpu(rtd, 0),
  62                                  SND_SOC_DAIFMT_I2S     |
  63                                  SND_SOC_DAIFMT_NB_NF   |
  64                                  SND_SOC_DAIFMT_CBC_CFC);
  65
  66        if (ret < 0) {
  67                dev_err(rtd->dev, "can't set format to I2S, err %d\n", ret);
  68                return ret;
  69        }
  70
  71        ret = snd_soc_dai_set_tdm_slot(asoc_rtd_to_cpu(rtd, 0), 0x3, 0x3, 2, 24);
  72        if (ret < 0) {
  73                dev_err(rtd->dev, "can't set I2S config, err %d\n", ret);
  74                return ret;
  75        }
  76
  77        return 0;
  78}
  79
  80static const unsigned int rates_48000[] = {
  81        48000,
  82};
  83
  84static const struct snd_pcm_hw_constraint_list constraints_48000 = {
  85        .count = ARRAY_SIZE(rates_48000),
  86        .list  = rates_48000,
  87};
  88
  89static int aif1_startup(struct snd_pcm_substream *substream)
  90{
  91        return snd_pcm_hw_constraint_list(substream->runtime, 0,
  92                        SNDRV_PCM_HW_PARAM_RATE,
  93                        &constraints_48000);
  94}
  95
  96static struct snd_soc_ops aif1_ops = {
  97        .startup = aif1_startup,
  98};
  99
 100SND_SOC_DAILINK_DEF(dummy,
 101        DAILINK_COMP_ARRAY(COMP_DUMMY()));
 102
 103SND_SOC_DAILINK_DEF(media,
 104        DAILINK_COMP_ARRAY(COMP_CPU("media-cpu-dai")));
 105
 106SND_SOC_DAILINK_DEF(deepbuffer,
 107        DAILINK_COMP_ARRAY(COMP_CPU("deepbuffer-cpu-dai")));
 108
 109SND_SOC_DAILINK_DEF(ssp2_port,
 110        DAILINK_COMP_ARRAY(COMP_CPU("ssp2-port")));
 111
 112SND_SOC_DAILINK_DEF(platform,
 113        DAILINK_COMP_ARRAY(COMP_PLATFORM("sst-mfld-platform")));
 114
 115static struct snd_soc_dai_link dais[] = {
 116        [MERR_DPCM_AUDIO] = {
 117                .name = "Audio Port",
 118                .stream_name = "Audio",
 119                .ignore_suspend = 1,
 120                .nonatomic = true,
 121                .dynamic = 1,
 122                .dpcm_playback = 1,
 123                .dpcm_capture = 1,
 124                .ops = &aif1_ops,
 125                SND_SOC_DAILINK_REG(media, dummy, platform),
 126        },
 127        [MERR_DPCM_DEEP_BUFFER] = {
 128                .name = "Deep-Buffer Audio Port",
 129                .stream_name = "Deep-Buffer Audio",
 130                .ignore_suspend = 1,
 131                .nonatomic = true,
 132                .dynamic = 1,
 133                .dpcm_playback = 1,
 134                .ops = &aif1_ops,
 135                SND_SOC_DAILINK_REG(deepbuffer, dummy, platform),
 136        },
 137        /* CODEC<->CODEC link */
 138        /* back ends */
 139        {
 140                .name = "SSP2-LowSpeed Connector",
 141                .id = 0,
 142                .no_pcm = 1,
 143                .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
 144                                                | SND_SOC_DAIFMT_CBC_CFC,
 145                .be_hw_params_fixup = codec_fixup,
 146                .ignore_suspend = 1,
 147                .dpcm_playback = 1,
 148                .dpcm_capture = 1,
 149                SND_SOC_DAILINK_REG(ssp2_port, dummy, platform),
 150        },
 151};
 152
 153/* SoC card */
 154static struct snd_soc_card bytcht_nocodec_card = {
 155        .name = "bytcht-nocodec",
 156        .owner = THIS_MODULE,
 157        .dai_link = dais,
 158        .num_links = ARRAY_SIZE(dais),
 159        .dapm_widgets = widgets,
 160        .num_dapm_widgets = ARRAY_SIZE(widgets),
 161        .dapm_routes = audio_map,
 162        .num_dapm_routes = ARRAY_SIZE(audio_map),
 163        .controls = controls,
 164        .num_controls = ARRAY_SIZE(controls),
 165        .fully_routed = true,
 166};
 167
 168static int snd_bytcht_nocodec_mc_probe(struct platform_device *pdev)
 169{
 170        int ret_val = 0;
 171
 172        /* register the soc card */
 173        bytcht_nocodec_card.dev = &pdev->dev;
 174
 175        ret_val = devm_snd_soc_register_card(&pdev->dev, &bytcht_nocodec_card);
 176
 177        if (ret_val) {
 178                dev_err(&pdev->dev, "devm_snd_soc_register_card failed %d\n",
 179                        ret_val);
 180                return ret_val;
 181        }
 182        platform_set_drvdata(pdev, &bytcht_nocodec_card);
 183        return ret_val;
 184}
 185
 186static struct platform_driver snd_bytcht_nocodec_mc_driver = {
 187        .driver = {
 188                .name = "bytcht_nocodec",
 189        },
 190        .probe = snd_bytcht_nocodec_mc_probe,
 191};
 192module_platform_driver(snd_bytcht_nocodec_mc_driver);
 193
 194MODULE_DESCRIPTION("ASoC Intel(R) Baytrail/Cherrytrail Nocodec Machine driver");
 195MODULE_AUTHOR("Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>");
 196MODULE_LICENSE("GPL v2");
 197MODULE_ALIAS("platform:bytcht_nocodec");
 198