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(codec_dai, WM8904_FLL_MCLK, WM8904_FLL_MCLK,
33		32768, params_rate(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(codec_dai, WM8904_CLK_FLL,
45			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, "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, "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, "atmel,ssc-controller", 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(cpu_np);
117
118	codec_np = of_parse_phandle(np, "atmel,audio-codec", 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(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((struct device_node *)dailink->cpus->of_node, "ssc");
144	ret = atmel_ssc_set_audio(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(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((struct device_node *)dailink->cpus->of_node, "ssc");
170
171	snd_soc_unregister_card(card);
172	atmel_ssc_put_audio(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_new = 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