1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * sam9g20_wm8731  --  SoC audio for AT91SAM9G20-based
4  * 			ATMEL AT91SAM9G20ek board.
5  *
6  *  Copyright (C) 2005 SAN People
7  *  Copyright (C) 2008 Atmel
8  *
9  * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
10  *
11  * Based on ati_b1_wm8731.c by:
12  * Frank Mandarino <fmandarino@endrelia.com>
13  * Copyright 2006 Endrelia Technologies Inc.
14  * Based on corgi.c by:
15  * Copyright 2005 Wolfson Microelectronics PLC.
16  * Copyright 2005 Openedhand Ltd.
17  */
18 
19 #include <linux/module.h>
20 #include <linux/moduleparam.h>
21 #include <linux/kernel.h>
22 #include <linux/clk.h>
23 #include <linux/timer.h>
24 #include <linux/interrupt.h>
25 #include <linux/platform_device.h>
26 #include <linux/i2c.h>
27 #include <linux/of.h>
28 
29 #include <linux/atmel-ssc.h>
30 
31 #include <sound/core.h>
32 #include <sound/pcm.h>
33 #include <sound/pcm_params.h>
34 #include <sound/soc.h>
35 
36 #include "../codecs/wm8731.h"
37 #include "atmel-pcm.h"
38 #include "atmel_ssc_dai.h"
39 
40 #define MCLK_RATE 12000000
41 
42 /*
43  * As shipped the board does not have inputs.  However, it is relatively
44  * straightforward to modify the board to hook them up so support is left
45  * in the driver.
46  */
47 #undef ENABLE_MIC_INPUT
48 
49 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
50 	SND_SOC_DAPM_MIC("Int Mic", NULL),
51 	SND_SOC_DAPM_SPK("Ext Spk", NULL),
52 };
53 
54 static const struct snd_soc_dapm_route intercon[] = {
55 
56 	/* speaker connected to LHPOUT/RHPOUT */
57 	{"Ext Spk", NULL, "LHPOUT"},
58 	{"Ext Spk", NULL, "RHPOUT"},
59 
60 	/* mic is connected to Mic Jack, with WM8731 Mic Bias */
61 	{"MICIN", NULL, "Mic Bias"},
62 	{"Mic Bias", NULL, "Int Mic"},
63 };
64 
65 /*
66  * Logic for a wm8731 as connected on a at91sam9g20ek board.
67  */
at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime * rtd)68 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
69 {
70 	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
71 	struct device *dev = rtd->dev;
72 	int ret;
73 
74 	dev_dbg(dev, "%s called\n", __func__);
75 
76 	ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
77 				     MCLK_RATE, SND_SOC_CLOCK_IN);
78 	if (ret < 0) {
79 		dev_err(dev, "Failed to set WM8731 SYSCLK: %d\n", ret);
80 		return ret;
81 	}
82 
83 #ifndef ENABLE_MIC_INPUT
84 	snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic");
85 #endif
86 
87 	return 0;
88 }
89 
90 SND_SOC_DAILINK_DEFS(pcm,
91 	DAILINK_COMP_ARRAY(COMP_CPU("at91rm9200_ssc.0")),
92 	DAILINK_COMP_ARRAY(COMP_CODEC("wm8731.0-001b", "wm8731-hifi")),
93 	DAILINK_COMP_ARRAY(COMP_PLATFORM("at91rm9200_ssc.0")));
94 
95 static struct snd_soc_dai_link at91sam9g20ek_dai = {
96 	.name = "WM8731",
97 	.stream_name = "WM8731 PCM",
98 	.init = at91sam9g20ek_wm8731_init,
99 	.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
100 		   SND_SOC_DAIFMT_CBP_CFP,
101 	SND_SOC_DAILINK_REG(pcm),
102 };
103 
104 static struct snd_soc_card snd_soc_at91sam9g20ek = {
105 	.name = "AT91SAMG20-EK",
106 	.owner = THIS_MODULE,
107 	.dai_link = &at91sam9g20ek_dai,
108 	.num_links = 1,
109 
110 	.dapm_widgets = at91sam9g20ek_dapm_widgets,
111 	.num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets),
112 	.dapm_routes = intercon,
113 	.num_dapm_routes = ARRAY_SIZE(intercon),
114 	.fully_routed = true,
115 };
116 
at91sam9g20ek_audio_probe(struct platform_device * pdev)117 static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
118 {
119 	struct device_node *np = pdev->dev.of_node;
120 	struct device_node *codec_np, *cpu_np;
121 	struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
122 	int ret;
123 
124 	if (!np) {
125 		return -ENODEV;
126 	}
127 
128 	ret = atmel_ssc_set_audio(0);
129 	if (ret) {
130 		dev_err(&pdev->dev, "ssc channel is not valid: %d\n", ret);
131 		return ret;
132 	}
133 
134 	card->dev = &pdev->dev;
135 
136 	/* Parse device node info */
137 	ret = snd_soc_of_parse_card_name(card, "atmel,model");
138 	if (ret)
139 		goto err;
140 
141 	ret = snd_soc_of_parse_audio_routing(card,
142 		"atmel,audio-routing");
143 	if (ret)
144 		goto err;
145 
146 	/* Parse codec info */
147 	at91sam9g20ek_dai.codecs->name = NULL;
148 	codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
149 	if (!codec_np) {
150 		dev_err(&pdev->dev, "codec info missing\n");
151 		ret = -EINVAL;
152 		goto err;
153 	}
154 	at91sam9g20ek_dai.codecs->of_node = codec_np;
155 
156 	/* Parse dai and platform info */
157 	at91sam9g20ek_dai.cpus->dai_name = NULL;
158 	at91sam9g20ek_dai.platforms->name = NULL;
159 	cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
160 	if (!cpu_np) {
161 		dev_err(&pdev->dev, "dai and pcm info missing\n");
162 		of_node_put(codec_np);
163 		ret = -EINVAL;
164 		goto err;
165 	}
166 	at91sam9g20ek_dai.cpus->of_node = cpu_np;
167 	at91sam9g20ek_dai.platforms->of_node = cpu_np;
168 
169 	of_node_put(codec_np);
170 	of_node_put(cpu_np);
171 
172 	ret = snd_soc_register_card(card);
173 	if (ret) {
174 		dev_err_probe(&pdev->dev, ret,
175 			      "snd_soc_register_card() failed\n");
176 		goto err;
177 	}
178 
179 	return 0;
180 
181 err:
182 	atmel_ssc_put_audio(0);
183 	return ret;
184 }
185 
at91sam9g20ek_audio_remove(struct platform_device * pdev)186 static int at91sam9g20ek_audio_remove(struct platform_device *pdev)
187 {
188 	struct snd_soc_card *card = platform_get_drvdata(pdev);
189 
190 	snd_soc_unregister_card(card);
191 	atmel_ssc_put_audio(0);
192 
193 	return 0;
194 }
195 
196 #ifdef CONFIG_OF
197 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
198 	{ .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
199 	{ }
200 };
201 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
202 #endif
203 
204 static struct platform_driver at91sam9g20ek_audio_driver = {
205 	.driver = {
206 		.name	= "at91sam9g20ek-audio",
207 		.of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
208 	},
209 	.probe	= at91sam9g20ek_audio_probe,
210 	.remove	= at91sam9g20ek_audio_remove,
211 };
212 
213 module_platform_driver(at91sam9g20ek_audio_driver);
214 
215 /* Module information */
216 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
217 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
218 MODULE_ALIAS("platform:at91sam9g20ek-audio");
219 MODULE_LICENSE("GPL");
220