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19#include <linux/module.h>
20#include <linux/moduleparam.h>
21#include <linux/kernel.h>
22#include <linux/clk.h>
23#include <linux/timer.h>
24#include <linux/interrupt.h>
25#include <linux/platform_device.h>
26#include <linux/i2c.h>
27#include <linux/of.h>
28
29#include <linux/atmel-ssc.h>
30
31#include <sound/core.h>
32#include <sound/pcm.h>
33#include <sound/pcm_params.h>
34#include <sound/soc.h>
35
36#include "../codecs/wm8731.h"
37#include "atmel-pcm.h"
38#include "atmel_ssc_dai.h"
39
40#define MCLK_RATE 12000000
41
42
43
44
45
46
47#undef ENABLE_MIC_INPUT
48
49static struct clk *mclk;
50
51static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
52 struct snd_soc_dapm_context *dapm,
53 enum snd_soc_bias_level level)
54{
55 static int mclk_on;
56 int ret = 0;
57
58 switch (level) {
59 case SND_SOC_BIAS_ON:
60 case SND_SOC_BIAS_PREPARE:
61 if (!mclk_on)
62 ret = clk_enable(mclk);
63 if (ret == 0)
64 mclk_on = 1;
65 break;
66
67 case SND_SOC_BIAS_OFF:
68 case SND_SOC_BIAS_STANDBY:
69 if (mclk_on)
70 clk_disable(mclk);
71 mclk_on = 0;
72 break;
73 }
74
75 return ret;
76}
77
78static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
79 SND_SOC_DAPM_MIC("Int Mic", NULL),
80 SND_SOC_DAPM_SPK("Ext Spk", NULL),
81};
82
83static const struct snd_soc_dapm_route intercon[] = {
84
85
86 {"Ext Spk", NULL, "LHPOUT"},
87 {"Ext Spk", NULL, "RHPOUT"},
88
89
90 {"MICIN", NULL, "Mic Bias"},
91 {"Mic Bias", NULL, "Int Mic"},
92};
93
94
95
96
97static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
98{
99 struct snd_soc_dai *codec_dai = rtd->codec_dai;
100 struct device *dev = rtd->dev;
101 int ret;
102
103 dev_dbg(dev, "%s called\n", __func__);
104
105 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
106 MCLK_RATE, SND_SOC_CLOCK_IN);
107 if (ret < 0) {
108 dev_err(dev, "Failed to set WM8731 SYSCLK: %d\n", ret);
109 return ret;
110 }
111
112#ifndef ENABLE_MIC_INPUT
113 snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic");
114#endif
115
116 return 0;
117}
118
119static struct snd_soc_dai_link at91sam9g20ek_dai = {
120 .name = "WM8731",
121 .stream_name = "WM8731 PCM",
122 .cpu_dai_name = "at91rm9200_ssc.0",
123 .codec_dai_name = "wm8731-hifi",
124 .init = at91sam9g20ek_wm8731_init,
125 .platform_name = "at91rm9200_ssc.0",
126 .codec_name = "wm8731.0-001b",
127 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
128 SND_SOC_DAIFMT_CBM_CFM,
129};
130
131static struct snd_soc_card snd_soc_at91sam9g20ek = {
132 .name = "AT91SAMG20-EK",
133 .owner = THIS_MODULE,
134 .dai_link = &at91sam9g20ek_dai,
135 .num_links = 1,
136 .set_bias_level = at91sam9g20ek_set_bias_level,
137
138 .dapm_widgets = at91sam9g20ek_dapm_widgets,
139 .num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets),
140 .dapm_routes = intercon,
141 .num_dapm_routes = ARRAY_SIZE(intercon),
142 .fully_routed = true,
143};
144
145static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
146{
147 struct device_node *np = pdev->dev.of_node;
148 struct device_node *codec_np, *cpu_np;
149 struct clk *pllb;
150 struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
151 int ret;
152
153 if (!np) {
154 return -ENODEV;
155 }
156
157 ret = atmel_ssc_set_audio(0);
158 if (ret) {
159 dev_err(&pdev->dev, "ssc channel is not valid\n");
160 return -EINVAL;
161 }
162
163
164
165
166 mclk = clk_get(NULL, "pck0");
167 if (IS_ERR(mclk)) {
168 dev_err(&pdev->dev, "Failed to get MCLK\n");
169 ret = PTR_ERR(mclk);
170 goto err;
171 }
172
173 pllb = clk_get(NULL, "pllb");
174 if (IS_ERR(pllb)) {
175 dev_err(&pdev->dev, "Failed to get PLLB\n");
176 ret = PTR_ERR(pllb);
177 goto err_mclk;
178 }
179 ret = clk_set_parent(mclk, pllb);
180 clk_put(pllb);
181 if (ret != 0) {
182 dev_err(&pdev->dev, "Failed to set MCLK parent\n");
183 goto err_mclk;
184 }
185
186 clk_set_rate(mclk, MCLK_RATE);
187
188 card->dev = &pdev->dev;
189
190
191 ret = snd_soc_of_parse_card_name(card, "atmel,model");
192 if (ret)
193 goto err;
194
195 ret = snd_soc_of_parse_audio_routing(card,
196 "atmel,audio-routing");
197 if (ret)
198 goto err;
199
200
201 at91sam9g20ek_dai.codec_name = NULL;
202 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
203 if (!codec_np) {
204 dev_err(&pdev->dev, "codec info missing\n");
205 return -EINVAL;
206 }
207 at91sam9g20ek_dai.codec_of_node = codec_np;
208
209
210 at91sam9g20ek_dai.cpu_dai_name = NULL;
211 at91sam9g20ek_dai.platform_name = NULL;
212 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
213 if (!cpu_np) {
214 dev_err(&pdev->dev, "dai and pcm info missing\n");
215 return -EINVAL;
216 }
217 at91sam9g20ek_dai.cpu_of_node = cpu_np;
218 at91sam9g20ek_dai.platform_of_node = cpu_np;
219
220 of_node_put(codec_np);
221 of_node_put(cpu_np);
222
223 ret = snd_soc_register_card(card);
224 if (ret) {
225 dev_err(&pdev->dev, "snd_soc_register_card() failed\n");
226 }
227
228 return ret;
229
230err_mclk:
231 clk_put(mclk);
232 mclk = NULL;
233err:
234 atmel_ssc_put_audio(0);
235 return ret;
236}
237
238static int at91sam9g20ek_audio_remove(struct platform_device *pdev)
239{
240 struct snd_soc_card *card = platform_get_drvdata(pdev);
241
242 clk_disable(mclk);
243 mclk = NULL;
244 snd_soc_unregister_card(card);
245 atmel_ssc_put_audio(0);
246
247 return 0;
248}
249
250#ifdef CONFIG_OF
251static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
252 { .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
253 { }
254};
255MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
256#endif
257
258static struct platform_driver at91sam9g20ek_audio_driver = {
259 .driver = {
260 .name = "at91sam9g20ek-audio",
261 .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
262 },
263 .probe = at91sam9g20ek_audio_probe,
264 .remove = at91sam9g20ek_audio_remove,
265};
266
267module_platform_driver(at91sam9g20ek_audio_driver);
268
269
270MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
271MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
272MODULE_ALIAS("platform:at91sam9g20ek-audio");
273MODULE_LICENSE("GPL");
274
