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Linux/sound/soc/atmel/sam9g20_wm8731.c

  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                 .owner  = THIS_MODULE,
313                 .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
314         },
315         .probe  = at91sam9g20ek_audio_probe,
316         .remove = at91sam9g20ek_audio_remove,
317 };
318 
319 module_platform_driver(at91sam9g20ek_audio_driver);
320 
321 /* Module information */
322 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
323 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
324 MODULE_ALIAS("platform:at91sam9g20ek-audio");
325 MODULE_LICENSE("GPL");
326 

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