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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 
 20 static const struct snd_soc_dapm_widget widgets[] = {
 21         SND_SOC_DAPM_MIC("Mic", NULL),
 22         SND_SOC_DAPM_SPK("Speaker", NULL),
 23 };
 24 
 25 static const struct snd_kcontrol_new controls[] = {
 26         SOC_DAPM_PIN_SWITCH("Mic"),
 27         SOC_DAPM_PIN_SWITCH("Speaker"),
 28 };
 29 
 30 static 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 
 40 static 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(rtd->cpu_dai,
 62                                   SND_SOC_DAIFMT_I2S     |
 63                                   SND_SOC_DAIFMT_NB_NF   |
 64                                   SND_SOC_DAIFMT_CBS_CFS);
 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(rtd->cpu_dai, 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 
 80 static const unsigned int rates_48000[] = {
 81         48000,
 82 };
 83 
 84 static const struct snd_pcm_hw_constraint_list constraints_48000 = {
 85         .count = ARRAY_SIZE(rates_48000),
 86         .list  = rates_48000,
 87 };
 88 
 89 static 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 
 96 static struct snd_soc_ops aif1_ops = {
 97         .startup = aif1_startup,
 98 };
 99 
100 SND_SOC_DAILINK_DEF(dummy,
101         DAILINK_COMP_ARRAY(COMP_DUMMY()));
102 
103 SND_SOC_DAILINK_DEF(media,
104         DAILINK_COMP_ARRAY(COMP_CPU("media-cpu-dai")));
105 
106 SND_SOC_DAILINK_DEF(deepbuffer,
107         DAILINK_COMP_ARRAY(COMP_CPU("deepbuffer-cpu-dai")));
108 
109 SND_SOC_DAILINK_DEF(ssp2_port,
110         DAILINK_COMP_ARRAY(COMP_CPU("ssp2-port")));
111 
112 SND_SOC_DAILINK_DEF(platform,
113         DAILINK_COMP_ARRAY(COMP_PLATFORM("sst-mfld-platform")));
114 
115 static 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_CBS_CFS,
145                 .be_hw_params_fixup = codec_fixup,
146                 .ignore_suspend = 1,
147                 .nonatomic = true,
148                 .dpcm_playback = 1,
149                 .dpcm_capture = 1,
150                 SND_SOC_DAILINK_REG(ssp2_port, dummy, platform),
151         },
152 };
153 
154 /* SoC card */
155 static struct snd_soc_card bytcht_nocodec_card = {
156         .name = "bytcht-nocodec",
157         .owner = THIS_MODULE,
158         .dai_link = dais,
159         .num_links = ARRAY_SIZE(dais),
160         .dapm_widgets = widgets,
161         .num_dapm_widgets = ARRAY_SIZE(widgets),
162         .dapm_routes = audio_map,
163         .num_dapm_routes = ARRAY_SIZE(audio_map),
164         .controls = controls,
165         .num_controls = ARRAY_SIZE(controls),
166         .fully_routed = true,
167 };
168 
169 static int snd_bytcht_nocodec_mc_probe(struct platform_device *pdev)
170 {
171         int ret_val = 0;
172 
173         /* register the soc card */
174         bytcht_nocodec_card.dev = &pdev->dev;
175 
176         ret_val = devm_snd_soc_register_card(&pdev->dev, &bytcht_nocodec_card);
177 
178         if (ret_val) {
179                 dev_err(&pdev->dev, "devm_snd_soc_register_card failed %d\n",
180                         ret_val);
181                 return ret_val;
182         }
183         platform_set_drvdata(pdev, &bytcht_nocodec_card);
184         return ret_val;
185 }
186 
187 static struct platform_driver snd_bytcht_nocodec_mc_driver = {
188         .driver = {
189                 .name = "bytcht_nocodec",
190         },
191         .probe = snd_bytcht_nocodec_mc_probe,
192 };
193 module_platform_driver(snd_bytcht_nocodec_mc_driver);
194 
195 MODULE_DESCRIPTION("ASoC Intel(R) Baytrail/Cherrytrail Nocodec Machine driver");
196 MODULE_AUTHOR("Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>");
197 MODULE_LICENSE("GPL v2");
198 MODULE_ALIAS("platform:bytcht_nocodec");
199 

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