1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * ASoC driver for PROTO AudioCODEC (with a WM8731)
4 *
5 * Author: Florian Meier, <koalo@koalo.de>
6 * Copyright 2013
7 */
8
9 #include <linux/module.h>
10 #include <linux/platform_device.h>
11
12 #include <sound/core.h>
13 #include <sound/pcm.h>
14 #include <sound/soc.h>
15 #include <sound/jack.h>
16
17 #include "../codecs/wm8731.h"
18
19 #define XTAL_RATE 12288000 /* This is fixed on this board */
20
snd_proto_init(struct snd_soc_pcm_runtime * rtd)21 static int snd_proto_init(struct snd_soc_pcm_runtime *rtd)
22 {
23 struct snd_soc_card *card = rtd->card;
24 struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
25
26 /* Set proto sysclk */
27 int ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
28 XTAL_RATE, SND_SOC_CLOCK_IN);
29 if (ret < 0) {
30 dev_err(card->dev, "Failed to set WM8731 SYSCLK: %d\n",
31 ret);
32 return ret;
33 }
34
35 return 0;
36 }
37
38 static const struct snd_soc_dapm_widget snd_proto_widget[] = {
39 SND_SOC_DAPM_MIC("Microphone Jack", NULL),
40 SND_SOC_DAPM_HP("Headphone Jack", NULL),
41 };
42
43 static const struct snd_soc_dapm_route snd_proto_route[] = {
44 /* speaker connected to LHPOUT/RHPOUT */
45 {"Headphone Jack", NULL, "LHPOUT"},
46 {"Headphone Jack", NULL, "RHPOUT"},
47
48 /* mic is connected to Mic Jack, with WM8731 Mic Bias */
49 {"MICIN", NULL, "Mic Bias"},
50 {"Mic Bias", NULL, "Microphone Jack"},
51 };
52
53 /* audio machine driver */
54 static struct snd_soc_card snd_proto = {
55 .name = "snd_mikroe_proto",
56 .owner = THIS_MODULE,
57 .dapm_widgets = snd_proto_widget,
58 .num_dapm_widgets = ARRAY_SIZE(snd_proto_widget),
59 .dapm_routes = snd_proto_route,
60 .num_dapm_routes = ARRAY_SIZE(snd_proto_route),
61 };
62
snd_proto_probe(struct platform_device * pdev)63 static int snd_proto_probe(struct platform_device *pdev)
64 {
65 struct snd_soc_dai_link *dai;
66 struct snd_soc_dai_link_component *comp;
67 struct device_node *np = pdev->dev.of_node;
68 struct device_node *codec_np, *cpu_np;
69 struct device_node *bitclkmaster = NULL;
70 struct device_node *framemaster = NULL;
71 unsigned int dai_fmt;
72 int ret = 0;
73
74 if (!np) {
75 dev_err(&pdev->dev, "No device node supplied\n");
76 return -EINVAL;
77 }
78
79 snd_proto.dev = &pdev->dev;
80 ret = snd_soc_of_parse_card_name(&snd_proto, "model");
81 if (ret)
82 return ret;
83
84 dai = devm_kzalloc(&pdev->dev, sizeof(*dai), GFP_KERNEL);
85 if (!dai)
86 return -ENOMEM;
87
88 /* for cpus/codecs/platforms */
89 comp = devm_kzalloc(&pdev->dev, 3 * sizeof(*comp), GFP_KERNEL);
90 if (!comp)
91 return -ENOMEM;
92
93 snd_proto.dai_link = dai;
94 snd_proto.num_links = 1;
95
96 dai->cpus = &comp[0];
97 dai->num_cpus = 1;
98 dai->codecs = &comp[1];
99 dai->num_codecs = 1;
100 dai->platforms = &comp[2];
101 dai->num_platforms = 1;
102
103 dai->name = "WM8731";
104 dai->stream_name = "WM8731 HiFi";
105 dai->codecs->dai_name = "wm8731-hifi";
106 dai->init = &snd_proto_init;
107
108 codec_np = of_parse_phandle(np, "audio-codec", 0);
109 if (!codec_np) {
110 dev_err(&pdev->dev, "audio-codec node missing\n");
111 return -EINVAL;
112 }
113 dai->codecs->of_node = codec_np;
114
115 cpu_np = of_parse_phandle(np, "i2s-controller", 0);
116 if (!cpu_np) {
117 dev_err(&pdev->dev, "i2s-controller missing\n");
118 ret = -EINVAL;
119 goto put_codec_node;
120 }
121 dai->cpus->of_node = cpu_np;
122 dai->platforms->of_node = cpu_np;
123
124 dai_fmt = snd_soc_daifmt_parse_format(np, NULL);
125 snd_soc_daifmt_parse_clock_provider_as_phandle(np, NULL,
126 &bitclkmaster, &framemaster);
127 if (bitclkmaster != framemaster) {
128 dev_err(&pdev->dev, "Must be the same bitclock and frame master\n");
129 ret = -EINVAL;
130 goto put_cpu_node;
131 }
132 if (bitclkmaster) {
133 if (codec_np == bitclkmaster)
134 dai_fmt |= SND_SOC_DAIFMT_CBP_CFP;
135 else
136 dai_fmt |= SND_SOC_DAIFMT_CBC_CFC;
137 } else {
138 dai_fmt |= snd_soc_daifmt_parse_clock_provider_as_flag(np, NULL);
139 }
140
141
142 dai->dai_fmt = dai_fmt;
143 ret = devm_snd_soc_register_card(&pdev->dev, &snd_proto);
144 if (ret)
145 dev_err_probe(&pdev->dev, ret,
146 "snd_soc_register_card() failed\n");
147
148
149 put_cpu_node:
150 of_node_put(bitclkmaster);
151 of_node_put(framemaster);
152 of_node_put(cpu_np);
153 put_codec_node:
154 of_node_put(codec_np);
155 return ret;
156 }
157
158 static const struct of_device_id snd_proto_of_match[] = {
159 { .compatible = "mikroe,mikroe-proto", },
160 {},
161 };
162 MODULE_DEVICE_TABLE(of, snd_proto_of_match);
163
164 static struct platform_driver snd_proto_driver = {
165 .driver = {
166 .name = "snd-mikroe-proto",
167 .of_match_table = snd_proto_of_match,
168 },
169 .probe = snd_proto_probe,
170 };
171
172 module_platform_driver(snd_proto_driver);
173
174 MODULE_AUTHOR("Florian Meier");
175 MODULE_DESCRIPTION("ASoC Driver for PROTO board (WM8731)");
176 MODULE_LICENSE("GPL");
177