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15#include <linux/of.h>
16#include <linux/export.h>
17#include <linux/module.h>
18#include <linux/mod_devicetable.h>
19#include <linux/platform_device.h>
20#include <linux/device.h>
21
22#include <sound/soc.h>
23#include <sound/soc-dai.h>
24#include <sound/soc-dapm.h>
25
26#include "../codecs/wm8731.h"
27#include "atmel_ssc_dai.h"
28
29
30#define MCLK_RATE 12288000
31
32#define DRV_NAME "sam9x5-snd-wm8731"
33
34struct sam9x5_drvdata {
35 int ssc_id;
36};
37
38
39
40
41static int sam9x5_wm8731_init(struct snd_soc_pcm_runtime *rtd)
42{
43 struct snd_soc_dai *codec_dai = rtd->codec_dai;
44 struct device *dev = rtd->dev;
45 int ret;
46
47 dev_dbg(dev, "%s called\n", __func__);
48
49
50 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
51 MCLK_RATE, SND_SOC_CLOCK_IN);
52 if (ret < 0) {
53 dev_err(dev, "Failed to set WM8731 SYSCLK: %d\n", ret);
54 return ret;
55 }
56
57 return 0;
58}
59
60
61
62
63
64
65
66
67
68static const struct snd_soc_dapm_widget sam9x5_dapm_widgets[] = {
69 SND_SOC_DAPM_HP("Headphone Jack", NULL),
70 SND_SOC_DAPM_LINE("Line In Jack", NULL),
71};
72
73static int sam9x5_wm8731_driver_probe(struct platform_device *pdev)
74{
75 struct device_node *np = pdev->dev.of_node;
76 struct device_node *codec_np, *cpu_np;
77 struct snd_soc_card *card;
78 struct snd_soc_dai_link *dai;
79 struct sam9x5_drvdata *priv;
80 int ret;
81
82 if (!np) {
83 dev_err(&pdev->dev, "No device node supplied\n");
84 return -EINVAL;
85 }
86
87 card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL);
88 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
89 dai = devm_kzalloc(&pdev->dev, sizeof(*dai), GFP_KERNEL);
90 if (!dai || !card || !priv) {
91 ret = -ENOMEM;
92 goto out;
93 }
94
95 snd_soc_card_set_drvdata(card, priv);
96
97 card->dev = &pdev->dev;
98 card->owner = THIS_MODULE;
99 card->dai_link = dai;
100 card->num_links = 1;
101 card->dapm_widgets = sam9x5_dapm_widgets;
102 card->num_dapm_widgets = ARRAY_SIZE(sam9x5_dapm_widgets);
103 dai->name = "WM8731";
104 dai->stream_name = "WM8731 PCM";
105 dai->codec_dai_name = "wm8731-hifi";
106 dai->init = sam9x5_wm8731_init;
107 dai->dai_fmt = SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_NB_NF
108 | SND_SOC_DAIFMT_CBM_CFM;
109
110 ret = snd_soc_of_parse_card_name(card, "atmel,model");
111 if (ret) {
112 dev_err(&pdev->dev, "atmel,model node missing\n");
113 goto out;
114 }
115
116 ret = snd_soc_of_parse_audio_routing(card, "atmel,audio-routing");
117 if (ret) {
118 dev_err(&pdev->dev, "atmel,audio-routing node missing\n");
119 goto out;
120 }
121
122 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
123 if (!codec_np) {
124 dev_err(&pdev->dev, "atmel,audio-codec node missing\n");
125 ret = -EINVAL;
126 goto out;
127 }
128
129 dai->codec_of_node = codec_np;
130
131 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
132 if (!cpu_np) {
133 dev_err(&pdev->dev, "atmel,ssc-controller node missing\n");
134 ret = -EINVAL;
135 goto out;
136 }
137 dai->cpu_of_node = cpu_np;
138 dai->platform_of_node = cpu_np;
139
140 priv->ssc_id = of_alias_get_id(cpu_np, "ssc");
141
142 ret = atmel_ssc_set_audio(priv->ssc_id);
143 if (ret != 0) {
144 dev_err(&pdev->dev, "Failed to set SSC %d for audio: %d\n",
145 ret, priv->ssc_id);
146 goto out;
147 }
148
149 of_node_put(codec_np);
150 of_node_put(cpu_np);
151
152 ret = snd_soc_register_card(card);
153 if (ret) {
154 dev_err(&pdev->dev, "Platform device allocation failed\n");
155 goto out_put_audio;
156 }
157
158 dev_dbg(&pdev->dev, "%s ok\n", __func__);
159
160 return ret;
161
162out_put_audio:
163 atmel_ssc_put_audio(priv->ssc_id);
164out:
165 return ret;
166}
167
168static int sam9x5_wm8731_driver_remove(struct platform_device *pdev)
169{
170 struct snd_soc_card *card = platform_get_drvdata(pdev);
171 struct sam9x5_drvdata *priv = card->drvdata;
172
173 snd_soc_unregister_card(card);
174 atmel_ssc_put_audio(priv->ssc_id);
175
176 return 0;
177}
178
179static const struct of_device_id sam9x5_wm8731_of_match[] = {
180 { .compatible = "atmel,sam9x5-wm8731-audio", },
181 {},
182};
183MODULE_DEVICE_TABLE(of, sam9x5_wm8731_of_match);
184
185static struct platform_driver sam9x5_wm8731_driver = {
186 .driver = {
187 .name = DRV_NAME,
188 .of_match_table = of_match_ptr(sam9x5_wm8731_of_match),
189 },
190 .probe = sam9x5_wm8731_driver_probe,
191 .remove = sam9x5_wm8731_driver_remove,
192};
193module_platform_driver(sam9x5_wm8731_driver);
194
195
196MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
197MODULE_AUTHOR("Richard Genoud <richard.genoud@gmail.com>");
198MODULE_DESCRIPTION("ALSA SoC machine driver for AT91SAM9x5 - WM8731");
199MODULE_LICENSE("GPL");
200MODULE_ALIAS("platform:" DRV_NAME);
201
