1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * sam9x5_wm8731   --	SoC audio for AT91SAM9X5-based boards
4  *			that are using WM8731 as codec.
5  *
6  *  Copyright (C) 2011 Atmel,
7  *		  Nicolas Ferre <nicolas.ferre@atmel.com>
8  *
9  *  Copyright (C) 2013 Paratronic,
10  *		  Richard Genoud <richard.genoud@gmail.com>
11  *
12  * Based on sam9g20_wm8731.c by:
13  * Sedji Gaouaou <sedji.gaouaou@atmel.com>
14  */
15 #include <linux/of.h>
16 #include <linux/export.h>
17 #include <linux/module.h>
18 #include <linux/mod_devicetable.h>
19 #include <linux/platform_device.h>
20 #include <linux/device.h>
21 
22 #include <sound/soc.h>
23 #include <sound/soc-dai.h>
24 #include <sound/soc-dapm.h>
25 
26 #include "../codecs/wm8731.h"
27 #include "atmel_ssc_dai.h"
28 
29 
30 #define MCLK_RATE 12288000
31 
32 #define DRV_NAME "sam9x5-snd-wm8731"
33 
34 struct sam9x5_drvdata {
35 	int ssc_id;
36 };
37 
38 /*
39  * Logic for a wm8731 as connected on a at91sam9x5ek based board.
40  */
sam9x5_wm8731_init(struct snd_soc_pcm_runtime * rtd)41 static int sam9x5_wm8731_init(struct snd_soc_pcm_runtime *rtd)
42 {
43 	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
44 	struct device *dev = rtd->dev;
45 	int ret;
46 
47 	dev_dbg(dev, "%s called\n", __func__);
48 
49 	/* set the codec system clock for DAC and ADC */
50 	ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
51 				     MCLK_RATE, SND_SOC_CLOCK_IN);
52 	if (ret < 0) {
53 		dev_err(dev, "Failed to set WM8731 SYSCLK: %d\n", ret);
54 		return ret;
55 	}
56 
57 	return 0;
58 }
59 
60 /*
61  * Audio paths on at91sam9x5ek board:
62  *
63  *  |A| ------------> |      | ---R----> Headphone Jack
64  *  |T| <----\        |  WM  | ---L--/
65  *  |9| ---> CLK <--> | 8731 | <--R----- Line In Jack
66  *  |1| <------------ |      | <--L--/
67  */
68 static const struct snd_soc_dapm_widget sam9x5_dapm_widgets[] = {
69 	SND_SOC_DAPM_HP("Headphone Jack", NULL),
70 	SND_SOC_DAPM_LINE("Line In Jack", NULL),
71 };
72 
sam9x5_wm8731_driver_probe(struct platform_device * pdev)73 static int sam9x5_wm8731_driver_probe(struct platform_device *pdev)
74 {
75 	struct device_node *np = pdev->dev.of_node;
76 	struct device_node *codec_np, *cpu_np;
77 	struct snd_soc_card *card;
78 	struct snd_soc_dai_link *dai;
79 	struct sam9x5_drvdata *priv;
80 	struct snd_soc_dai_link_component *comp;
81 	int ret;
82 
83 	if (!np) {
84 		dev_err(&pdev->dev, "No device node supplied\n");
85 		return -EINVAL;
86 	}
87 
88 	card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL);
89 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
90 	dai = devm_kzalloc(&pdev->dev, sizeof(*dai), GFP_KERNEL);
91 	comp = devm_kzalloc(&pdev->dev, 3 * sizeof(*comp), GFP_KERNEL);
92 	if (!dai || !card || !priv || !comp) {
93 		ret = -ENOMEM;
94 		goto out;
95 	}
96 
97 	snd_soc_card_set_drvdata(card, priv);
98 
99 	card->dev = &pdev->dev;
100 	card->owner = THIS_MODULE;
101 	card->dai_link = dai;
102 	card->num_links = 1;
103 	card->dapm_widgets = sam9x5_dapm_widgets;
104 	card->num_dapm_widgets = ARRAY_SIZE(sam9x5_dapm_widgets);
105 
106 	dai->cpus = &comp[0];
107 	dai->num_cpus = 1;
108 	dai->codecs = &comp[1];
109 	dai->num_codecs = 1;
110 	dai->platforms = &comp[2];
111 	dai->num_platforms = 1;
112 
113 	dai->name = "WM8731";
114 	dai->stream_name = "WM8731 PCM";
115 	dai->codecs->dai_name = "wm8731-hifi";
116 	dai->init = sam9x5_wm8731_init;
117 	dai->dai_fmt = SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_NB_NF
118 		| SND_SOC_DAIFMT_CBP_CFP;
119 
120 	ret = snd_soc_of_parse_card_name(card, "atmel,model");
121 	if (ret) {
122 		dev_err(&pdev->dev, "atmel,model node missing\n");
123 		goto out;
124 	}
125 
126 	ret = snd_soc_of_parse_audio_routing(card, "atmel,audio-routing");
127 	if (ret) {
128 		dev_err(&pdev->dev, "atmel,audio-routing node missing\n");
129 		goto out;
130 	}
131 
132 	codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
133 	if (!codec_np) {
134 		dev_err(&pdev->dev, "atmel,audio-codec node missing\n");
135 		ret = -EINVAL;
136 		goto out;
137 	}
138 
139 	dai->codecs->of_node = codec_np;
140 
141 	cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
142 	if (!cpu_np) {
143 		dev_err(&pdev->dev, "atmel,ssc-controller node missing\n");
144 		ret = -EINVAL;
145 		goto out_put_codec_np;
146 	}
147 	dai->cpus->of_node = cpu_np;
148 	dai->platforms->of_node = cpu_np;
149 
150 	priv->ssc_id = of_alias_get_id(cpu_np, "ssc");
151 
152 	ret = atmel_ssc_set_audio(priv->ssc_id);
153 	if (ret != 0) {
154 		dev_err(&pdev->dev, "Failed to set SSC %d for audio: %d\n",
155 			ret, priv->ssc_id);
156 		goto out_put_cpu_np;
157 	}
158 
159 	ret = devm_snd_soc_register_card(&pdev->dev, card);
160 	if (ret) {
161 		dev_err(&pdev->dev, "Platform device allocation failed\n");
162 		goto out_put_audio;
163 	}
164 
165 	dev_dbg(&pdev->dev, "%s ok\n", __func__);
166 
167 	goto out_put_cpu_np;
168 
169 out_put_audio:
170 	atmel_ssc_put_audio(priv->ssc_id);
171 out_put_cpu_np:
172 	of_node_put(cpu_np);
173 out_put_codec_np:
174 	of_node_put(codec_np);
175 out:
176 	return ret;
177 }
178 
sam9x5_wm8731_driver_remove(struct platform_device * pdev)179 static int sam9x5_wm8731_driver_remove(struct platform_device *pdev)
180 {
181 	struct snd_soc_card *card = platform_get_drvdata(pdev);
182 	struct sam9x5_drvdata *priv = card->drvdata;
183 
184 	atmel_ssc_put_audio(priv->ssc_id);
185 
186 	return 0;
187 }
188 
189 static const struct of_device_id sam9x5_wm8731_of_match[] = {
190 	{ .compatible = "atmel,sam9x5-wm8731-audio", },
191 	{},
192 };
193 MODULE_DEVICE_TABLE(of, sam9x5_wm8731_of_match);
194 
195 static struct platform_driver sam9x5_wm8731_driver = {
196 	.driver = {
197 		.name = DRV_NAME,
198 		.of_match_table = of_match_ptr(sam9x5_wm8731_of_match),
199 	},
200 	.probe = sam9x5_wm8731_driver_probe,
201 	.remove = sam9x5_wm8731_driver_remove,
202 };
203 module_platform_driver(sam9x5_wm8731_driver);
204 
205 /* Module information */
206 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
207 MODULE_AUTHOR("Richard Genoud <richard.genoud@gmail.com>");
208 MODULE_DESCRIPTION("ALSA SoC machine driver for AT91SAM9x5 - WM8731");
209 MODULE_LICENSE("GPL");
210 MODULE_ALIAS("platform:" DRV_NAME);
211