1 /*
2 * sam9g20_wm8731 -- SoC audio for AT91SAM9G20-based
3 * ATMEL AT91SAM9G20ek board.
4 *
5 * Copyright (C) 2005 SAN People
6 * Copyright (C) 2008 Atmel
7 *
8 * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
9 *
10 * Based on ati_b1_wm8731.c by:
11 * Frank Mandarino <fmandarino@endrelia.com>
12 * Copyright 2006 Endrelia Technologies Inc.
13 * Based on corgi.c by:
14 * Copyright 2005 Wolfson Microelectronics PLC.
15 * Copyright 2005 Openedhand Ltd.
16 *
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation; either version 2 of the License, or
20 * (at your option) any later version.
21 *
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
26 *
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
30 */
31
32 #include <linux/module.h>
33 #include <linux/moduleparam.h>
34 #include <linux/kernel.h>
35 #include <linux/clk.h>
36 #include <linux/timer.h>
37 #include <linux/interrupt.h>
38 #include <linux/platform_device.h>
39 #include <linux/i2c.h>
40 #include <linux/of.h>
41
42 #include <linux/atmel-ssc.h>
43
44 #include <sound/core.h>
45 #include <sound/pcm.h>
46 #include <sound/pcm_params.h>
47 #include <sound/soc.h>
48
49 #include "../codecs/wm8731.h"
50 #include "atmel-pcm.h"
51 #include "atmel_ssc_dai.h"
52
53 #define MCLK_RATE 12000000
54
55 /*
56 * As shipped the board does not have inputs. However, it is relatively
57 * straightforward to modify the board to hook them up so support is left
58 * in the driver.
59 */
60 #undef ENABLE_MIC_INPUT
61
62 static struct clk *mclk;
63
64 static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
65 struct snd_soc_dapm_context *dapm,
66 enum snd_soc_bias_level level)
67 {
68 static int mclk_on;
69 int ret = 0;
70
71 switch (level) {
72 case SND_SOC_BIAS_ON:
73 case SND_SOC_BIAS_PREPARE:
74 if (!mclk_on)
75 ret = clk_enable(mclk);
76 if (ret == 0)
77 mclk_on = 1;
78 break;
79
80 case SND_SOC_BIAS_OFF:
81 case SND_SOC_BIAS_STANDBY:
82 if (mclk_on)
83 clk_disable(mclk);
84 mclk_on = 0;
85 break;
86 }
87
88 return ret;
89 }
90
91 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
92 SND_SOC_DAPM_MIC("Int Mic", NULL),
93 SND_SOC_DAPM_SPK("Ext Spk", NULL),
94 };
95
96 static const struct snd_soc_dapm_route intercon[] = {
97
98 /* speaker connected to LHPOUT/RHPOUT */
99 {"Ext Spk", NULL, "LHPOUT"},
100 {"Ext Spk", NULL, "RHPOUT"},
101
102 /* mic is connected to Mic Jack, with WM8731 Mic Bias */
103 {"MICIN", NULL, "Mic Bias"},
104 {"Mic Bias", NULL, "Int Mic"},
105 };
106
107 /*
108 * Logic for a wm8731 as connected on a at91sam9g20ek board.
109 */
110 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
111 {
112 struct snd_soc_dai *codec_dai = rtd->codec_dai;
113 int ret;
114
115 printk(KERN_DEBUG
116 "at91sam9g20ek_wm8731 "
117 ": at91sam9g20ek_wm8731_init() called\n");
118
119 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
120 MCLK_RATE, SND_SOC_CLOCK_IN);
121 if (ret < 0) {
122 printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret);
123 return ret;
124 }
125
126 #ifndef ENABLE_MIC_INPUT
127 snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic");
128 #endif
129
130 return 0;
131 }
132
133 static struct snd_soc_dai_link at91sam9g20ek_dai = {
134 .name = "WM8731",
135 .stream_name = "WM8731 PCM",
136 .cpu_dai_name = "at91rm9200_ssc.0",
137 .codec_dai_name = "wm8731-hifi",
138 .init = at91sam9g20ek_wm8731_init,
139 .platform_name = "at91rm9200_ssc.0",
140 .codec_name = "wm8731.0-001b",
141 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
142 SND_SOC_DAIFMT_CBM_CFM,
143 };
144
145 static struct snd_soc_card snd_soc_at91sam9g20ek = {
146 .name = "AT91SAMG20-EK",
147 .owner = THIS_MODULE,
148 .dai_link = &at91sam9g20ek_dai,
149 .num_links = 1,
150 .set_bias_level = at91sam9g20ek_set_bias_level,
151
152 .dapm_widgets = at91sam9g20ek_dapm_widgets,
153 .num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets),
154 .dapm_routes = intercon,
155 .num_dapm_routes = ARRAY_SIZE(intercon),
156 .fully_routed = true,
157 };
158
159 static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
160 {
161 struct device_node *np = pdev->dev.of_node;
162 struct device_node *codec_np, *cpu_np;
163 struct clk *pllb;
164 struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
165 int ret;
166
167 if (!np) {
168 return -ENODEV;
169 }
170
171 ret = atmel_ssc_set_audio(0);
172 if (ret) {
173 dev_err(&pdev->dev, "ssc channel is not valid\n");
174 return -EINVAL;
175 }
176
177 /*
178 * Codec MCLK is supplied by PCK0 - set it up.
179 */
180 mclk = clk_get(NULL, "pck0");
181 if (IS_ERR(mclk)) {
182 printk(KERN_ERR "ASoC: Failed to get MCLK\n");
183 ret = PTR_ERR(mclk);
184 goto err;
185 }
186
187 pllb = clk_get(NULL, "pllb");
188 if (IS_ERR(pllb)) {
189 printk(KERN_ERR "ASoC: Failed to get PLLB\n");
190 ret = PTR_ERR(pllb);
191 goto err_mclk;
192 }
193 ret = clk_set_parent(mclk, pllb);
194 clk_put(pllb);
195 if (ret != 0) {
196 printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
197 goto err_mclk;
198 }
199
200 clk_set_rate(mclk, MCLK_RATE);
201
202 card->dev = &pdev->dev;
203
204 /* Parse device node info */
205 ret = snd_soc_of_parse_card_name(card, "atmel,model");
206 if (ret)
207 goto err;
208
209 ret = snd_soc_of_parse_audio_routing(card,
210 "atmel,audio-routing");
211 if (ret)
212 goto err;
213
214 /* Parse codec info */
215 at91sam9g20ek_dai.codec_name = NULL;
216 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
217 if (!codec_np) {
218 dev_err(&pdev->dev, "codec info missing\n");
219 return -EINVAL;
220 }
221 at91sam9g20ek_dai.codec_of_node = codec_np;
222
223 /* Parse dai and platform info */
224 at91sam9g20ek_dai.cpu_dai_name = NULL;
225 at91sam9g20ek_dai.platform_name = NULL;
226 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
227 if (!cpu_np) {
228 dev_err(&pdev->dev, "dai and pcm info missing\n");
229 return -EINVAL;
230 }
231 at91sam9g20ek_dai.cpu_of_node = cpu_np;
232 at91sam9g20ek_dai.platform_of_node = cpu_np;
233
234 of_node_put(codec_np);
235 of_node_put(cpu_np);
236
237 ret = snd_soc_register_card(card);
238 if (ret) {
239 printk(KERN_ERR "ASoC: snd_soc_register_card() failed\n");
240 }
241
242 return ret;
243
244 err_mclk:
245 clk_put(mclk);
246 mclk = NULL;
247 err:
248 atmel_ssc_put_audio(0);
249 return ret;
250 }
251
252 static int at91sam9g20ek_audio_remove(struct platform_device *pdev)
253 {
254 struct snd_soc_card *card = platform_get_drvdata(pdev);
255
256 clk_disable(mclk);
257 mclk = NULL;
258 snd_soc_unregister_card(card);
259 atmel_ssc_put_audio(0);
260
261 return 0;
262 }
263
264 #ifdef CONFIG_OF
265 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
266 { .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
267 { }
268 };
269 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
270 #endif
271
272 static struct platform_driver at91sam9g20ek_audio_driver = {
273 .driver = {
274 .name = "at91sam9g20ek-audio",
275 .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
276 },
277 .probe = at91sam9g20ek_audio_probe,
278 .remove = at91sam9g20ek_audio_remove,
279 };
280
281 module_platform_driver(at91sam9g20ek_audio_driver);
282
283 /* Module information */
284 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
285 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
286 MODULE_ALIAS("platform:at91sam9g20ek-audio");
287 MODULE_LICENSE("GPL");
288
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