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20#include <linux/of.h>
21#include <linux/export.h>
22#include <linux/module.h>
23#include <linux/mod_devicetable.h>
24#include <linux/platform_device.h>
25#include <linux/device.h>
26
27#include <sound/soc.h>
28#include <sound/soc-dai.h>
29#include <sound/soc-dapm.h>
30
31#include "../codecs/wm8731.h"
32#include "atmel_ssc_dai.h"
33
34
35#define MCLK_RATE 12288000
36
37#define DRV_NAME "sam9x5-snd-wm8731"
38
39struct sam9x5_drvdata {
40 int ssc_id;
41};
42
43
44
45
46static int sam9x5_wm8731_init(struct snd_soc_pcm_runtime *rtd)
47{
48 struct snd_soc_dai *codec_dai = rtd->codec_dai;
49 struct device *dev = rtd->dev;
50 int ret;
51
52 dev_dbg(dev, "%s called\n", __func__);
53
54
55 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
56 MCLK_RATE, SND_SOC_CLOCK_IN);
57 if (ret < 0) {
58 dev_err(dev, "Failed to set WM8731 SYSCLK: %d\n", ret);
59 return ret;
60 }
61
62 return 0;
63}
64
65
66
67
68
69
70
71
72
73static const struct snd_soc_dapm_widget sam9x5_dapm_widgets[] = {
74 SND_SOC_DAPM_HP("Headphone Jack", NULL),
75 SND_SOC_DAPM_LINE("Line In Jack", NULL),
76};
77
78static int sam9x5_wm8731_driver_probe(struct platform_device *pdev)
79{
80 struct device_node *np = pdev->dev.of_node;
81 struct device_node *codec_np, *cpu_np;
82 struct snd_soc_card *card;
83 struct snd_soc_dai_link *dai;
84 struct sam9x5_drvdata *priv;
85 int ret;
86
87 if (!np) {
88 dev_err(&pdev->dev, "No device node supplied\n");
89 return -EINVAL;
90 }
91
92 card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL);
93 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
94 dai = devm_kzalloc(&pdev->dev, sizeof(*dai), GFP_KERNEL);
95 if (!dai || !card || !priv) {
96 ret = -ENOMEM;
97 goto out;
98 }
99
100 snd_soc_card_set_drvdata(card, priv);
101
102 card->dev = &pdev->dev;
103 card->owner = THIS_MODULE;
104 card->dai_link = dai;
105 card->num_links = 1;
106 card->dapm_widgets = sam9x5_dapm_widgets;
107 card->num_dapm_widgets = ARRAY_SIZE(sam9x5_dapm_widgets);
108 dai->name = "WM8731";
109 dai->stream_name = "WM8731 PCM";
110 dai->codec_dai_name = "wm8731-hifi";
111 dai->init = sam9x5_wm8731_init;
112 dai->dai_fmt = SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_NB_NF
113 | SND_SOC_DAIFMT_CBM_CFM;
114
115 ret = snd_soc_of_parse_card_name(card, "atmel,model");
116 if (ret) {
117 dev_err(&pdev->dev, "atmel,model node missing\n");
118 goto out;
119 }
120
121 ret = snd_soc_of_parse_audio_routing(card, "atmel,audio-routing");
122 if (ret) {
123 dev_err(&pdev->dev, "atmel,audio-routing node missing\n");
124 goto out;
125 }
126
127 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
128 if (!codec_np) {
129 dev_err(&pdev->dev, "atmel,audio-codec node missing\n");
130 ret = -EINVAL;
131 goto out;
132 }
133
134 dai->codec_of_node = codec_np;
135
136 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
137 if (!cpu_np) {
138 dev_err(&pdev->dev, "atmel,ssc-controller node missing\n");
139 ret = -EINVAL;
140 goto out;
141 }
142 dai->cpu_of_node = cpu_np;
143 dai->platform_of_node = cpu_np;
144
145 priv->ssc_id = of_alias_get_id(cpu_np, "ssc");
146
147 ret = atmel_ssc_set_audio(priv->ssc_id);
148 if (ret != 0) {
149 dev_err(&pdev->dev, "Failed to set SSC %d for audio: %d\n",
150 ret, priv->ssc_id);
151 goto out;
152 }
153
154 of_node_put(codec_np);
155 of_node_put(cpu_np);
156
157 ret = snd_soc_register_card(card);
158 if (ret) {
159 dev_err(&pdev->dev, "Platform device allocation failed\n");
160 goto out_put_audio;
161 }
162
163 dev_dbg(&pdev->dev, "%s ok\n", __func__);
164
165 return ret;
166
167out_put_audio:
168 atmel_ssc_put_audio(priv->ssc_id);
169out:
170 return ret;
171}
172
173static int sam9x5_wm8731_driver_remove(struct platform_device *pdev)
174{
175 struct snd_soc_card *card = platform_get_drvdata(pdev);
176 struct sam9x5_drvdata *priv = card->drvdata;
177
178 snd_soc_unregister_card(card);
179 atmel_ssc_put_audio(priv->ssc_id);
180
181 return 0;
182}
183
184static const struct of_device_id sam9x5_wm8731_of_match[] = {
185 { .compatible = "atmel,sam9x5-wm8731-audio", },
186 {},
187};
188MODULE_DEVICE_TABLE(of, sam9x5_wm8731_of_match);
189
190static struct platform_driver sam9x5_wm8731_driver = {
191 .driver = {
192 .name = DRV_NAME,
193 .of_match_table = of_match_ptr(sam9x5_wm8731_of_match),
194 },
195 .probe = sam9x5_wm8731_driver_probe,
196 .remove = sam9x5_wm8731_driver_remove,
197};
198module_platform_driver(sam9x5_wm8731_driver);
199
200
201MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
202MODULE_AUTHOR("Richard Genoud <richard.genoud@gmail.com>");
203MODULE_DESCRIPTION("ALSA SoC machine driver for AT91SAM9x5 - WM8731");
204MODULE_LICENSE("GPL");
205MODULE_ALIAS("platform:" DRV_NAME);
206
