1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * atmel_wm8904 - Atmel ASoC driver for boards with WM8904 codec.
4  *
5  * Copyright (C) 2012 Atmel
6  *
7  * Author: Bo Shen <voice.shen@atmel.com>
8  */
9 
10 #include <linux/clk.h>
11 #include <linux/module.h>
12 #include <linux/of.h>
13 #include <linux/of_device.h>
14 
15 #include <sound/soc.h>
16 
17 #include "../codecs/wm8904.h"
18 #include "atmel_ssc_dai.h"
19 
20 static const struct snd_soc_dapm_widget atmel_asoc_wm8904_dapm_widgets[] = {
21 	SND_SOC_DAPM_HP("Headphone Jack", NULL),
22 	SND_SOC_DAPM_MIC("Mic", NULL),
23 	SND_SOC_DAPM_LINE("Line In Jack", NULL),
24 };
25 
atmel_asoc_wm8904_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)26 static int atmel_asoc_wm8904_hw_params(struct snd_pcm_substream *substream,
27 		struct snd_pcm_hw_params *params)
28 {
29 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
30 	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
31 	int ret;
32 
33 	ret = snd_soc_dai_set_pll(codec_dai, WM8904_FLL_MCLK, WM8904_FLL_MCLK,
34 		32768, params_rate(params) * 256);
35 	if (ret < 0) {
36 		pr_err("%s - failed to set wm8904 codec PLL.", __func__);
37 		return ret;
38 	}
39 
40 	/*
41 	 * As here wm8904 use FLL output as its system clock
42 	 * so calling set_sysclk won't care freq parameter
43 	 * then we pass 0
44 	 */
45 	ret = snd_soc_dai_set_sysclk(codec_dai, WM8904_CLK_FLL,
46 			0, SND_SOC_CLOCK_IN);
47 	if (ret < 0) {
48 		pr_err("%s -failed to set wm8904 SYSCLK\n", __func__);
49 		return ret;
50 	}
51 
52 	return 0;
53 }
54 
55 static const struct snd_soc_ops atmel_asoc_wm8904_ops = {
56 	.hw_params = atmel_asoc_wm8904_hw_params,
57 };
58 
59 SND_SOC_DAILINK_DEFS(pcm,
60 	DAILINK_COMP_ARRAY(COMP_EMPTY()),
61 	DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "wm8904-hifi")),
62 	DAILINK_COMP_ARRAY(COMP_EMPTY()));
63 
64 static struct snd_soc_dai_link atmel_asoc_wm8904_dailink = {
65 	.name = "WM8904",
66 	.stream_name = "WM8904 PCM",
67 	.dai_fmt = SND_SOC_DAIFMT_I2S
68 		| SND_SOC_DAIFMT_NB_NF
69 		| SND_SOC_DAIFMT_CBP_CFP,
70 	.ops = &atmel_asoc_wm8904_ops,
71 	SND_SOC_DAILINK_REG(pcm),
72 };
73 
74 static struct snd_soc_card atmel_asoc_wm8904_card = {
75 	.name = "atmel_asoc_wm8904",
76 	.owner = THIS_MODULE,
77 	.dai_link = &atmel_asoc_wm8904_dailink,
78 	.num_links = 1,
79 	.dapm_widgets = atmel_asoc_wm8904_dapm_widgets,
80 	.num_dapm_widgets = ARRAY_SIZE(atmel_asoc_wm8904_dapm_widgets),
81 	.fully_routed = true,
82 };
83 
atmel_asoc_wm8904_dt_init(struct platform_device * pdev)84 static int atmel_asoc_wm8904_dt_init(struct platform_device *pdev)
85 {
86 	struct device_node *np = pdev->dev.of_node;
87 	struct device_node *codec_np, *cpu_np;
88 	struct snd_soc_card *card = &atmel_asoc_wm8904_card;
89 	struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
90 	int ret;
91 
92 	if (!np) {
93 		dev_err(&pdev->dev, "only device tree supported\n");
94 		return -EINVAL;
95 	}
96 
97 	ret = snd_soc_of_parse_card_name(card, "atmel,model");
98 	if (ret) {
99 		dev_err(&pdev->dev, "failed to parse card name\n");
100 		return ret;
101 	}
102 
103 	ret = snd_soc_of_parse_audio_routing(card, "atmel,audio-routing");
104 	if (ret) {
105 		dev_err(&pdev->dev, "failed to parse audio routing\n");
106 		return ret;
107 	}
108 
109 	cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
110 	if (!cpu_np) {
111 		dev_err(&pdev->dev, "failed to get dai and pcm info\n");
112 		ret = -EINVAL;
113 		return ret;
114 	}
115 	dailink->cpus->of_node = cpu_np;
116 	dailink->platforms->of_node = cpu_np;
117 	of_node_put(cpu_np);
118 
119 	codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
120 	if (!codec_np) {
121 		dev_err(&pdev->dev, "failed to get codec info\n");
122 		ret = -EINVAL;
123 		return ret;
124 	}
125 	dailink->codecs->of_node = codec_np;
126 	of_node_put(codec_np);
127 
128 	return 0;
129 }
130 
atmel_asoc_wm8904_probe(struct platform_device * pdev)131 static int atmel_asoc_wm8904_probe(struct platform_device *pdev)
132 {
133 	struct snd_soc_card *card = &atmel_asoc_wm8904_card;
134 	struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
135 	int id, ret;
136 
137 	card->dev = &pdev->dev;
138 	ret = atmel_asoc_wm8904_dt_init(pdev);
139 	if (ret) {
140 		dev_err(&pdev->dev, "failed to init dt info\n");
141 		return ret;
142 	}
143 
144 	id = of_alias_get_id((struct device_node *)dailink->cpus->of_node, "ssc");
145 	ret = atmel_ssc_set_audio(id);
146 	if (ret != 0) {
147 		dev_err(&pdev->dev, "failed to set SSC %d for audio\n", id);
148 		return ret;
149 	}
150 
151 	ret = snd_soc_register_card(card);
152 	if (ret) {
153 		dev_err(&pdev->dev, "snd_soc_register_card failed\n");
154 		goto err_set_audio;
155 	}
156 
157 	return 0;
158 
159 err_set_audio:
160 	atmel_ssc_put_audio(id);
161 	return ret;
162 }
163 
atmel_asoc_wm8904_remove(struct platform_device * pdev)164 static int atmel_asoc_wm8904_remove(struct platform_device *pdev)
165 {
166 	struct snd_soc_card *card = platform_get_drvdata(pdev);
167 	struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
168 	int id;
169 
170 	id = of_alias_get_id((struct device_node *)dailink->cpus->of_node, "ssc");
171 
172 	snd_soc_unregister_card(card);
173 	atmel_ssc_put_audio(id);
174 
175 	return 0;
176 }
177 
178 #ifdef CONFIG_OF
179 static const struct of_device_id atmel_asoc_wm8904_dt_ids[] = {
180 	{ .compatible = "atmel,asoc-wm8904", },
181 	{ }
182 };
183 MODULE_DEVICE_TABLE(of, atmel_asoc_wm8904_dt_ids);
184 #endif
185 
186 static struct platform_driver atmel_asoc_wm8904_driver = {
187 	.driver = {
188 		.name = "atmel-wm8904-audio",
189 		.of_match_table = of_match_ptr(atmel_asoc_wm8904_dt_ids),
190 		.pm		= &snd_soc_pm_ops,
191 	},
192 	.probe = atmel_asoc_wm8904_probe,
193 	.remove = atmel_asoc_wm8904_remove,
194 };
195 
196 module_platform_driver(atmel_asoc_wm8904_driver);
197 
198 /* Module information */
199 MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>");
200 MODULE_DESCRIPTION("ALSA SoC machine driver for Atmel EK with WM8904 codec");
201 MODULE_LICENSE("GPL");
202