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