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Linux/sound/soc/intel/boards/bytcht_nocodec.c

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  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");
201 

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