xref: /linux/sound/soc/atmel/sam9g20_wm8731.c (revision b889fcf63cb62e7fdb7816565e28f44dbe4a76a5)
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 
41 #include <linux/pinctrl/consumer.h>
42 
43 #include <linux/atmel-ssc.h>
44 
45 #include <sound/core.h>
46 #include <sound/pcm.h>
47 #include <sound/pcm_params.h>
48 #include <sound/soc.h>
49 
50 #include <asm/mach-types.h>
51 #include <mach/hardware.h>
52 #include <mach/gpio.h>
53 
54 #include "../codecs/wm8731.h"
55 #include "atmel-pcm.h"
56 #include "atmel_ssc_dai.h"
57 
58 #define MCLK_RATE 12000000
59 
60 /*
61  * As shipped the board does not have inputs.  However, it is relatively
62  * straightforward to modify the board to hook them up so support is left
63  * in the driver.
64  */
65 #undef ENABLE_MIC_INPUT
66 
67 static struct clk *mclk;
68 
69 static int at91sam9g20ek_hw_params(struct snd_pcm_substream *substream,
70 	struct snd_pcm_hw_params *params)
71 {
72 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
73 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
74 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
75 	int ret;
76 
77 	/* set codec DAI configuration */
78 	ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
79 		SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
80 	if (ret < 0)
81 		return ret;
82 
83 	/* set cpu DAI configuration */
84 	ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
85 		SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
86 	if (ret < 0)
87 		return ret;
88 
89 	return 0;
90 }
91 
92 static struct snd_soc_ops at91sam9g20ek_ops = {
93 	.hw_params = at91sam9g20ek_hw_params,
94 };
95 
96 static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
97 					struct snd_soc_dapm_context *dapm,
98 					enum snd_soc_bias_level level)
99 {
100 	static int mclk_on;
101 	int ret = 0;
102 
103 	switch (level) {
104 	case SND_SOC_BIAS_ON:
105 	case SND_SOC_BIAS_PREPARE:
106 		if (!mclk_on)
107 			ret = clk_enable(mclk);
108 		if (ret == 0)
109 			mclk_on = 1;
110 		break;
111 
112 	case SND_SOC_BIAS_OFF:
113 	case SND_SOC_BIAS_STANDBY:
114 		if (mclk_on)
115 			clk_disable(mclk);
116 		mclk_on = 0;
117 		break;
118 	}
119 
120 	return ret;
121 }
122 
123 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
124 	SND_SOC_DAPM_MIC("Int Mic", NULL),
125 	SND_SOC_DAPM_SPK("Ext Spk", NULL),
126 };
127 
128 static const struct snd_soc_dapm_route intercon[] = {
129 
130 	/* speaker connected to LHPOUT */
131 	{"Ext Spk", NULL, "LHPOUT"},
132 
133 	/* mic is connected to Mic Jack, with WM8731 Mic Bias */
134 	{"MICIN", NULL, "Mic Bias"},
135 	{"Mic Bias", NULL, "Int Mic"},
136 };
137 
138 /*
139  * Logic for a wm8731 as connected on a at91sam9g20ek board.
140  */
141 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
142 {
143 	struct snd_soc_codec *codec = rtd->codec;
144 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
145 	struct snd_soc_dapm_context *dapm = &codec->dapm;
146 	int ret;
147 
148 	printk(KERN_DEBUG
149 			"at91sam9g20ek_wm8731 "
150 			": at91sam9g20ek_wm8731_init() called\n");
151 
152 	ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
153 		MCLK_RATE, SND_SOC_CLOCK_IN);
154 	if (ret < 0) {
155 		printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret);
156 		return ret;
157 	}
158 
159 	/* Add specific widgets */
160 	snd_soc_dapm_new_controls(dapm, at91sam9g20ek_dapm_widgets,
161 				  ARRAY_SIZE(at91sam9g20ek_dapm_widgets));
162 	/* Set up specific audio path interconnects */
163 	snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon));
164 
165 	/* not connected */
166 	snd_soc_dapm_nc_pin(dapm, "RLINEIN");
167 	snd_soc_dapm_nc_pin(dapm, "LLINEIN");
168 
169 #ifdef ENABLE_MIC_INPUT
170 	snd_soc_dapm_enable_pin(dapm, "Int Mic");
171 #else
172 	snd_soc_dapm_nc_pin(dapm, "Int Mic");
173 #endif
174 
175 	/* always connected */
176 	snd_soc_dapm_enable_pin(dapm, "Ext Spk");
177 
178 	return 0;
179 }
180 
181 static struct snd_soc_dai_link at91sam9g20ek_dai = {
182 	.name = "WM8731",
183 	.stream_name = "WM8731 PCM",
184 	.cpu_dai_name = "at91rm9200_ssc.0",
185 	.codec_dai_name = "wm8731-hifi",
186 	.init = at91sam9g20ek_wm8731_init,
187 	.platform_name = "at91rm9200_ssc.0",
188 	.codec_name = "wm8731.0-001b",
189 	.ops = &at91sam9g20ek_ops,
190 };
191 
192 static struct snd_soc_card snd_soc_at91sam9g20ek = {
193 	.name = "AT91SAMG20-EK",
194 	.owner = THIS_MODULE,
195 	.dai_link = &at91sam9g20ek_dai,
196 	.num_links = 1,
197 	.set_bias_level = at91sam9g20ek_set_bias_level,
198 };
199 
200 static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
201 {
202 	struct device_node *np = pdev->dev.of_node;
203 	struct device_node *codec_np, *cpu_np;
204 	struct clk *pllb;
205 	struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
206 	struct pinctrl *pinctrl;
207 	int ret;
208 
209 	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
210 	if (IS_ERR(pinctrl)) {
211 		dev_err(&pdev->dev, "Failed to request pinctrl for mck\n");
212 		return PTR_ERR(pinctrl);
213 	}
214 
215 	if (!np) {
216 		if (!(machine_is_at91sam9g20ek() ||
217 			machine_is_at91sam9g20ek_2mmc()))
218 			return -ENODEV;
219 	}
220 
221 	ret = atmel_ssc_set_audio(0);
222 	if (ret) {
223 		dev_err(&pdev->dev, "ssc channel is not valid\n");
224 		return -EINVAL;
225 	}
226 
227 	/*
228 	 * Codec MCLK is supplied by PCK0 - set it up.
229 	 */
230 	mclk = clk_get(NULL, "pck0");
231 	if (IS_ERR(mclk)) {
232 		printk(KERN_ERR "ASoC: Failed to get MCLK\n");
233 		ret = PTR_ERR(mclk);
234 		goto err;
235 	}
236 
237 	pllb = clk_get(NULL, "pllb");
238 	if (IS_ERR(pllb)) {
239 		printk(KERN_ERR "ASoC: Failed to get PLLB\n");
240 		ret = PTR_ERR(pllb);
241 		goto err_mclk;
242 	}
243 	ret = clk_set_parent(mclk, pllb);
244 	clk_put(pllb);
245 	if (ret != 0) {
246 		printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
247 		goto err_mclk;
248 	}
249 
250 	clk_set_rate(mclk, MCLK_RATE);
251 
252 	card->dev = &pdev->dev;
253 
254 	/* Parse device node info */
255 	if (np) {
256 		ret = snd_soc_of_parse_card_name(card, "atmel,model");
257 		if (ret)
258 			goto err;
259 
260 		ret = snd_soc_of_parse_audio_routing(card,
261 			"atmel,audio-routing");
262 		if (ret)
263 			goto err;
264 
265 		/* Parse codec info */
266 		at91sam9g20ek_dai.codec_name = NULL;
267 		codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
268 		if (!codec_np) {
269 			dev_err(&pdev->dev, "codec info missing\n");
270 			return -EINVAL;
271 		}
272 		at91sam9g20ek_dai.codec_of_node = codec_np;
273 
274 		/* Parse dai and platform info */
275 		at91sam9g20ek_dai.cpu_dai_name = NULL;
276 		at91sam9g20ek_dai.platform_name = NULL;
277 		cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
278 		if (!cpu_np) {
279 			dev_err(&pdev->dev, "dai and pcm info missing\n");
280 			return -EINVAL;
281 		}
282 		at91sam9g20ek_dai.cpu_of_node = cpu_np;
283 		at91sam9g20ek_dai.platform_of_node = cpu_np;
284 
285 		of_node_put(codec_np);
286 		of_node_put(cpu_np);
287 	}
288 
289 	ret = snd_soc_register_card(card);
290 	if (ret) {
291 		printk(KERN_ERR "ASoC: snd_soc_register_card() failed\n");
292 	}
293 
294 	return ret;
295 
296 err_mclk:
297 	clk_put(mclk);
298 	mclk = NULL;
299 err:
300 	atmel_ssc_put_audio(0);
301 	return ret;
302 }
303 
304 static int at91sam9g20ek_audio_remove(struct platform_device *pdev)
305 {
306 	struct snd_soc_card *card = platform_get_drvdata(pdev);
307 
308 	atmel_ssc_put_audio(0);
309 	snd_soc_unregister_card(card);
310 	clk_put(mclk);
311 	mclk = NULL;
312 
313 	return 0;
314 }
315 
316 #ifdef CONFIG_OF
317 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
318 	{ .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
319 	{ }
320 };
321 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
322 #endif
323 
324 static struct platform_driver at91sam9g20ek_audio_driver = {
325 	.driver = {
326 		.name	= "at91sam9g20ek-audio",
327 		.owner	= THIS_MODULE,
328 		.of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
329 	},
330 	.probe	= at91sam9g20ek_audio_probe,
331 	.remove	= at91sam9g20ek_audio_remove,
332 };
333 
334 module_platform_driver(at91sam9g20ek_audio_driver);
335 
336 /* Module information */
337 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
338 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
339 MODULE_ALIAS("platform:at91sam9g20ek-audio");
340 MODULE_LICENSE("GPL");
341