xref: /linux/sound/soc/intel/boards/bytcht_nocodec.c (revision d060296cc0300ae8ed08004ebd3994bf325fa257)
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 	[MERR_DPCM_COMPR] = {
137 		.name = "Compressed Port",
138 		.stream_name = "Compress",
139 		.cpu_dai_name = "compress-cpu-dai",
140 		.codec_dai_name = "snd-soc-dummy-dai",
141 		.codec_name = "snd-soc-dummy",
142 		.platform_name = "sst-mfld-platform",
143 	},
144 	/* CODEC<->CODEC link */
145 	/* back ends */
146 	{
147 		.name = "SSP2-LowSpeed Connector",
148 		.id = 1,
149 		.cpu_dai_name = "ssp2-port",
150 		.platform_name = "sst-mfld-platform",
151 		.no_pcm = 1,
152 		.codec_dai_name = "snd-soc-dummy-dai",
153 		.codec_name = "snd-soc-dummy",
154 		.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
155 						| SND_SOC_DAIFMT_CBS_CFS,
156 		.be_hw_params_fixup = codec_fixup,
157 		.ignore_suspend = 1,
158 		.nonatomic = true,
159 		.dpcm_playback = 1,
160 		.dpcm_capture = 1,
161 	},
162 };
163 
164 /* SoC card */
165 static struct snd_soc_card bytcht_nocodec_card = {
166 	.name = "bytcht-nocodec",
167 	.owner = THIS_MODULE,
168 	.dai_link = dais,
169 	.num_links = ARRAY_SIZE(dais),
170 	.dapm_widgets = widgets,
171 	.num_dapm_widgets = ARRAY_SIZE(widgets),
172 	.dapm_routes = audio_map,
173 	.num_dapm_routes = ARRAY_SIZE(audio_map),
174 	.controls = controls,
175 	.num_controls = ARRAY_SIZE(controls),
176 	.fully_routed = true,
177 };
178 
179 static int snd_bytcht_nocodec_mc_probe(struct platform_device *pdev)
180 {
181 	int ret_val = 0;
182 
183 	/* register the soc card */
184 	bytcht_nocodec_card.dev = &pdev->dev;
185 
186 	ret_val = devm_snd_soc_register_card(&pdev->dev, &bytcht_nocodec_card);
187 
188 	if (ret_val) {
189 		dev_err(&pdev->dev, "devm_snd_soc_register_card failed %d\n",
190 			ret_val);
191 		return ret_val;
192 	}
193 	platform_set_drvdata(pdev, &bytcht_nocodec_card);
194 	return ret_val;
195 }
196 
197 static struct platform_driver snd_bytcht_nocodec_mc_driver = {
198 	.driver = {
199 		.name = "bytcht_nocodec",
200 	},
201 	.probe = snd_bytcht_nocodec_mc_probe,
202 };
203 module_platform_driver(snd_bytcht_nocodec_mc_driver);
204 
205 MODULE_DESCRIPTION("ASoC Intel(R) Baytrail/Cherrytrail Nocodec Machine driver");
206 MODULE_AUTHOR("Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>");
207 MODULE_LICENSE("GPL v2");
208 MODULE_ALIAS("platform:bytcht_nocodec");
209