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

source code of linux/sound/soc/atmel/atmel_wm8904.c