xref: /openbmc/linux/sound/soc/atmel/sam9g20_wm8731.c (revision e8f6f3b4)
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 <asm/mach-types.h>
50 #include <mach/hardware.h>
51 
52 #include "../codecs/wm8731.h"
53 #include "atmel-pcm.h"
54 #include "atmel_ssc_dai.h"
55 
56 #define MCLK_RATE 12000000
57 
58 /*
59  * As shipped the board does not have inputs.  However, it is relatively
60  * straightforward to modify the board to hook them up so support is left
61  * in the driver.
62  */
63 #undef ENABLE_MIC_INPUT
64 
65 static struct clk *mclk;
66 
67 static int at91sam9g20ek_hw_params(struct snd_pcm_substream *substream,
68 	struct snd_pcm_hw_params *params)
69 {
70 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
71 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
72 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
73 	int ret;
74 
75 	/* set codec DAI configuration */
76 	ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
77 		SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
78 	if (ret < 0)
79 		return ret;
80 
81 	/* set cpu DAI configuration */
82 	ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
83 		SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
84 	if (ret < 0)
85 		return ret;
86 
87 	return 0;
88 }
89 
90 static struct snd_soc_ops at91sam9g20ek_ops = {
91 	.hw_params = at91sam9g20ek_hw_params,
92 };
93 
94 static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
95 					struct snd_soc_dapm_context *dapm,
96 					enum snd_soc_bias_level level)
97 {
98 	static int mclk_on;
99 	int ret = 0;
100 
101 	switch (level) {
102 	case SND_SOC_BIAS_ON:
103 	case SND_SOC_BIAS_PREPARE:
104 		if (!mclk_on)
105 			ret = clk_enable(mclk);
106 		if (ret == 0)
107 			mclk_on = 1;
108 		break;
109 
110 	case SND_SOC_BIAS_OFF:
111 	case SND_SOC_BIAS_STANDBY:
112 		if (mclk_on)
113 			clk_disable(mclk);
114 		mclk_on = 0;
115 		break;
116 	}
117 
118 	return ret;
119 }
120 
121 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
122 	SND_SOC_DAPM_MIC("Int Mic", NULL),
123 	SND_SOC_DAPM_SPK("Ext Spk", NULL),
124 };
125 
126 static const struct snd_soc_dapm_route intercon[] = {
127 
128 	/* speaker connected to LHPOUT */
129 	{"Ext Spk", NULL, "LHPOUT"},
130 
131 	/* mic is connected to Mic Jack, with WM8731 Mic Bias */
132 	{"MICIN", NULL, "Mic Bias"},
133 	{"Mic Bias", NULL, "Int Mic"},
134 };
135 
136 /*
137  * Logic for a wm8731 as connected on a at91sam9g20ek board.
138  */
139 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
140 {
141 	struct snd_soc_codec *codec = rtd->codec;
142 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
143 	struct snd_soc_dapm_context *dapm = &codec->dapm;
144 	int ret;
145 
146 	printk(KERN_DEBUG
147 			"at91sam9g20ek_wm8731 "
148 			": at91sam9g20ek_wm8731_init() called\n");
149 
150 	ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
151 		MCLK_RATE, SND_SOC_CLOCK_IN);
152 	if (ret < 0) {
153 		printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret);
154 		return ret;
155 	}
156 
157 	/* not connected */
158 	snd_soc_dapm_nc_pin(dapm, "RLINEIN");
159 	snd_soc_dapm_nc_pin(dapm, "LLINEIN");
160 
161 #ifndef ENABLE_MIC_INPUT
162 	snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic");
163 #endif
164 
165 	return 0;
166 }
167 
168 static struct snd_soc_dai_link at91sam9g20ek_dai = {
169 	.name = "WM8731",
170 	.stream_name = "WM8731 PCM",
171 	.cpu_dai_name = "at91rm9200_ssc.0",
172 	.codec_dai_name = "wm8731-hifi",
173 	.init = at91sam9g20ek_wm8731_init,
174 	.platform_name = "at91rm9200_ssc.0",
175 	.codec_name = "wm8731.0-001b",
176 	.ops = &at91sam9g20ek_ops,
177 };
178 
179 static struct snd_soc_card snd_soc_at91sam9g20ek = {
180 	.name = "AT91SAMG20-EK",
181 	.owner = THIS_MODULE,
182 	.dai_link = &at91sam9g20ek_dai,
183 	.num_links = 1,
184 	.set_bias_level = at91sam9g20ek_set_bias_level,
185 
186 	.dapm_widgets = at91sam9g20ek_dapm_widgets,
187 	.num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets),
188 	.dapm_routes = intercon,
189 	.num_dapm_routes = ARRAY_SIZE(intercon),
190 };
191 
192 static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
193 {
194 	struct device_node *np = pdev->dev.of_node;
195 	struct device_node *codec_np, *cpu_np;
196 	struct clk *pllb;
197 	struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
198 	int ret;
199 
200 	if (!np) {
201 		if (!(machine_is_at91sam9g20ek() ||
202 			machine_is_at91sam9g20ek_2mmc()))
203 			return -ENODEV;
204 	}
205 
206 	ret = atmel_ssc_set_audio(0);
207 	if (ret) {
208 		dev_err(&pdev->dev, "ssc channel is not valid\n");
209 		return -EINVAL;
210 	}
211 
212 	/*
213 	 * Codec MCLK is supplied by PCK0 - set it up.
214 	 */
215 	mclk = clk_get(NULL, "pck0");
216 	if (IS_ERR(mclk)) {
217 		printk(KERN_ERR "ASoC: Failed to get MCLK\n");
218 		ret = PTR_ERR(mclk);
219 		goto err;
220 	}
221 
222 	pllb = clk_get(NULL, "pllb");
223 	if (IS_ERR(pllb)) {
224 		printk(KERN_ERR "ASoC: Failed to get PLLB\n");
225 		ret = PTR_ERR(pllb);
226 		goto err_mclk;
227 	}
228 	ret = clk_set_parent(mclk, pllb);
229 	clk_put(pllb);
230 	if (ret != 0) {
231 		printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
232 		goto err_mclk;
233 	}
234 
235 	clk_set_rate(mclk, MCLK_RATE);
236 
237 	card->dev = &pdev->dev;
238 
239 	/* Parse device node info */
240 	if (np) {
241 		ret = snd_soc_of_parse_card_name(card, "atmel,model");
242 		if (ret)
243 			goto err;
244 
245 		ret = snd_soc_of_parse_audio_routing(card,
246 			"atmel,audio-routing");
247 		if (ret)
248 			goto err;
249 
250 		/* Parse codec info */
251 		at91sam9g20ek_dai.codec_name = NULL;
252 		codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
253 		if (!codec_np) {
254 			dev_err(&pdev->dev, "codec info missing\n");
255 			return -EINVAL;
256 		}
257 		at91sam9g20ek_dai.codec_of_node = codec_np;
258 
259 		/* Parse dai and platform info */
260 		at91sam9g20ek_dai.cpu_dai_name = NULL;
261 		at91sam9g20ek_dai.platform_name = NULL;
262 		cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
263 		if (!cpu_np) {
264 			dev_err(&pdev->dev, "dai and pcm info missing\n");
265 			return -EINVAL;
266 		}
267 		at91sam9g20ek_dai.cpu_of_node = cpu_np;
268 		at91sam9g20ek_dai.platform_of_node = cpu_np;
269 
270 		of_node_put(codec_np);
271 		of_node_put(cpu_np);
272 	}
273 
274 	ret = snd_soc_register_card(card);
275 	if (ret) {
276 		printk(KERN_ERR "ASoC: snd_soc_register_card() failed\n");
277 	}
278 
279 	return ret;
280 
281 err_mclk:
282 	clk_put(mclk);
283 	mclk = NULL;
284 err:
285 	atmel_ssc_put_audio(0);
286 	return ret;
287 }
288 
289 static int at91sam9g20ek_audio_remove(struct platform_device *pdev)
290 {
291 	struct snd_soc_card *card = platform_get_drvdata(pdev);
292 
293 	clk_disable(mclk);
294 	mclk = NULL;
295 	snd_soc_unregister_card(card);
296 	atmel_ssc_put_audio(0);
297 
298 	return 0;
299 }
300 
301 #ifdef CONFIG_OF
302 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
303 	{ .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
304 	{ }
305 };
306 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
307 #endif
308 
309 static struct platform_driver at91sam9g20ek_audio_driver = {
310 	.driver = {
311 		.name	= "at91sam9g20ek-audio",
312 		.of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
313 	},
314 	.probe	= at91sam9g20ek_audio_probe,
315 	.remove	= at91sam9g20ek_audio_remove,
316 };
317 
318 module_platform_driver(at91sam9g20ek_audio_driver);
319 
320 /* Module information */
321 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
322 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
323 MODULE_ALIAS("platform:at91sam9g20ek-audio");
324 MODULE_LICENSE("GPL");
325