xref: /openbmc/linux/sound/soc/atmel/atmel_wm8904.c (revision e23feb16)
1 /*
2  * atmel_wm8904 - Atmel ASoC driver for boards with WM8904 codec.
3  *
4  * Copyright (C) 2012 Atmel
5  *
6  * Author: Bo Shen <voice.shen@atmel.com>
7  *
8  * GPLv2 or later
9  */
10 
11 #include <linux/clk.h>
12 #include <linux/module.h>
13 #include <linux/of.h>
14 #include <linux/of_device.h>
15 #include <linux/pinctrl/consumer.h>
16 
17 #include <sound/soc.h>
18 
19 #include "../codecs/wm8904.h"
20 #include "atmel_ssc_dai.h"
21 
22 #define MCLK_RATE 32768
23 
24 static struct clk *mclk;
25 
26 static const struct snd_soc_dapm_widget atmel_asoc_wm8904_dapm_widgets[] = {
27 	SND_SOC_DAPM_HP("Headphone Jack", NULL),
28 	SND_SOC_DAPM_MIC("Mic", NULL),
29 	SND_SOC_DAPM_LINE("Line In Jack", NULL),
30 };
31 
32 static int atmel_asoc_wm8904_hw_params(struct snd_pcm_substream *substream,
33 		struct snd_pcm_hw_params *params)
34 {
35 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
36 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
37 	int ret;
38 
39 	ret = snd_soc_dai_set_pll(codec_dai, WM8904_FLL_MCLK, WM8904_FLL_MCLK,
40 		32768, params_rate(params) * 256);
41 	if (ret < 0) {
42 		pr_err("%s - failed to set wm8904 codec PLL.", __func__);
43 		return ret;
44 	}
45 
46 	/*
47 	 * As here wm8904 use FLL output as its system clock
48 	 * so calling set_sysclk won't care freq parameter
49 	 * then we pass 0
50 	 */
51 	ret = snd_soc_dai_set_sysclk(codec_dai, WM8904_CLK_FLL,
52 			0, SND_SOC_CLOCK_IN);
53 	if (ret < 0) {
54 		pr_err("%s -failed to set wm8904 SYSCLK\n", __func__);
55 		return ret;
56 	}
57 
58 	return 0;
59 }
60 
61 static struct snd_soc_ops atmel_asoc_wm8904_ops = {
62 	.hw_params = atmel_asoc_wm8904_hw_params,
63 };
64 
65 static int atmel_set_bias_level(struct snd_soc_card *card,
66 		struct snd_soc_dapm_context *dapm,
67 		enum snd_soc_bias_level level)
68 {
69 	if (dapm->bias_level == SND_SOC_BIAS_STANDBY) {
70 		switch (level) {
71 		case SND_SOC_BIAS_PREPARE:
72 			clk_prepare_enable(mclk);
73 			break;
74 		case SND_SOC_BIAS_OFF:
75 			clk_disable_unprepare(mclk);
76 			break;
77 		default:
78 			break;
79 		}
80 	}
81 
82 	return 0;
83 };
84 
85 static struct snd_soc_dai_link atmel_asoc_wm8904_dailink = {
86 	.name = "WM8904",
87 	.stream_name = "WM8904 PCM",
88 	.codec_dai_name = "wm8904-hifi",
89 	.dai_fmt = SND_SOC_DAIFMT_I2S
90 		| SND_SOC_DAIFMT_NB_NF
91 		| SND_SOC_DAIFMT_CBM_CFM,
92 	.ops = &atmel_asoc_wm8904_ops,
93 };
94 
95 static struct snd_soc_card atmel_asoc_wm8904_card = {
96 	.name = "atmel_asoc_wm8904",
97 	.owner = THIS_MODULE,
98 	.set_bias_level = atmel_set_bias_level,
99 	.dai_link = &atmel_asoc_wm8904_dailink,
100 	.num_links = 1,
101 	.dapm_widgets = atmel_asoc_wm8904_dapm_widgets,
102 	.num_dapm_widgets = ARRAY_SIZE(atmel_asoc_wm8904_dapm_widgets),
103 	.fully_routed = true,
104 };
105 
106 static int atmel_asoc_wm8904_dt_init(struct platform_device *pdev)
107 {
108 	struct device_node *np = pdev->dev.of_node;
109 	struct device_node *codec_np, *cpu_np;
110 	struct snd_soc_card *card = &atmel_asoc_wm8904_card;
111 	struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
112 	int ret;
113 
114 	if (!np) {
115 		dev_err(&pdev->dev, "only device tree supported\n");
116 		return -EINVAL;
117 	}
118 
119 	ret = snd_soc_of_parse_card_name(card, "atmel,model");
120 	if (ret) {
121 		dev_err(&pdev->dev, "failed to parse card name\n");
122 		return ret;
123 	}
124 
125 	ret = snd_soc_of_parse_audio_routing(card, "atmel,audio-routing");
126 	if (ret) {
127 		dev_err(&pdev->dev, "failed to parse audio routing\n");
128 		return ret;
129 	}
130 
131 	cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
132 	if (!cpu_np) {
133 		dev_err(&pdev->dev, "failed to get dai and pcm info\n");
134 		ret = -EINVAL;
135 		return ret;
136 	}
137 	dailink->cpu_of_node = cpu_np;
138 	dailink->platform_of_node = cpu_np;
139 	of_node_put(cpu_np);
140 
141 	codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
142 	if (!codec_np) {
143 		dev_err(&pdev->dev, "failed to get codec info\n");
144 		ret = -EINVAL;
145 		return ret;
146 	}
147 	dailink->codec_of_node = codec_np;
148 	of_node_put(codec_np);
149 
150 	return 0;
151 }
152 
153 static int atmel_asoc_wm8904_probe(struct platform_device *pdev)
154 {
155 	struct snd_soc_card *card = &atmel_asoc_wm8904_card;
156 	struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
157 	struct clk *clk_src;
158 	struct pinctrl *pinctrl;
159 	int id, ret;
160 
161 	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
162 	if (IS_ERR(pinctrl)) {
163 		dev_err(&pdev->dev, "failed to request pinctrl\n");
164 		return PTR_ERR(pinctrl);
165 	}
166 
167 	card->dev = &pdev->dev;
168 	ret = atmel_asoc_wm8904_dt_init(pdev);
169 	if (ret) {
170 		dev_err(&pdev->dev, "failed to init dt info\n");
171 		return ret;
172 	}
173 
174 	id = of_alias_get_id((struct device_node *)dailink->cpu_of_node, "ssc");
175 	ret = atmel_ssc_set_audio(id);
176 	if (ret != 0) {
177 		dev_err(&pdev->dev, "failed to set SSC %d for audio\n", id);
178 		return ret;
179 	}
180 
181 	mclk = clk_get(NULL, "pck0");
182 	if (IS_ERR(mclk)) {
183 		dev_err(&pdev->dev, "failed to get pck0\n");
184 		ret = PTR_ERR(mclk);
185 		goto err_set_audio;
186 	}
187 
188 	clk_src = clk_get(NULL, "clk32k");
189 	if (IS_ERR(clk_src)) {
190 		dev_err(&pdev->dev, "failed to get clk32k\n");
191 		ret = PTR_ERR(clk_src);
192 		goto err_set_audio;
193 	}
194 
195 	ret = clk_set_parent(mclk, clk_src);
196 	clk_put(clk_src);
197 	if (ret != 0) {
198 		dev_err(&pdev->dev, "failed to set MCLK parent\n");
199 		goto err_set_audio;
200 	}
201 
202 	dev_info(&pdev->dev, "setting pck0 to %dHz\n", MCLK_RATE);
203 	clk_set_rate(mclk, MCLK_RATE);
204 
205 	ret = snd_soc_register_card(card);
206 	if (ret) {
207 		dev_err(&pdev->dev, "snd_soc_register_card failed\n");
208 		goto err_set_audio;
209 	}
210 
211 	return 0;
212 
213 err_set_audio:
214 	atmel_ssc_put_audio(id);
215 	return ret;
216 }
217 
218 static int atmel_asoc_wm8904_remove(struct platform_device *pdev)
219 {
220 	struct snd_soc_card *card = platform_get_drvdata(pdev);
221 	struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
222 	int id;
223 
224 	id = of_alias_get_id((struct device_node *)dailink->cpu_of_node, "ssc");
225 
226 	snd_soc_unregister_card(card);
227 	atmel_ssc_put_audio(id);
228 
229 	return 0;
230 }
231 
232 #ifdef CONFIG_OF
233 static const struct of_device_id atmel_asoc_wm8904_dt_ids[] = {
234 	{ .compatible = "atmel,asoc-wm8904", },
235 	{ }
236 };
237 #endif
238 
239 static struct platform_driver atmel_asoc_wm8904_driver = {
240 	.driver = {
241 		.name = "atmel-wm8904-audio",
242 		.owner = THIS_MODULE,
243 		.of_match_table = of_match_ptr(atmel_asoc_wm8904_dt_ids),
244 	},
245 	.probe = atmel_asoc_wm8904_probe,
246 	.remove = atmel_asoc_wm8904_remove,
247 };
248 
249 module_platform_driver(atmel_asoc_wm8904_driver);
250 
251 /* Module information */
252 MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>");
253 MODULE_DESCRIPTION("ALSA SoC machine driver for Atmel EK with WM8904 codec");
254 MODULE_LICENSE("GPL");
255