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 
codec_fixup(struct snd_soc_pcm_runtime * rtd,struct snd_pcm_hw_params * params)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(asoc_rtd_to_cpu(rtd, 0),
62 				  SND_SOC_DAIFMT_I2S     |
63 				  SND_SOC_DAIFMT_NB_NF   |
64 				  SND_SOC_DAIFMT_BP_FP);
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 
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 
aif1_startup(struct snd_pcm_substream * substream)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 const 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_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 */
154 static 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 
snd_bytcht_nocodec_mc_probe(struct platform_device * pdev)168 static 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 
186 static struct platform_driver snd_bytcht_nocodec_mc_driver = {
187 	.driver = {
188 		.name = "bytcht_nocodec",
189 	},
190 	.probe = snd_bytcht_nocodec_mc_probe,
191 };
192 module_platform_driver(snd_bytcht_nocodec_mc_driver);
193 
194 MODULE_DESCRIPTION("ASoC Intel(R) Baytrail/Cherrytrail Nocodec Machine driver");
195 MODULE_AUTHOR("Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>");
196 MODULE_LICENSE("GPL v2");
197 MODULE_ALIAS("platform:bytcht_nocodec");
198