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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 "../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 */
 99         {"Ext Spk", NULL, "LHPOUT"},
100 
101         /* mic is connected to Mic Jack, with WM8731 Mic Bias */
102         {"MICIN", NULL, "Mic Bias"},
103         {"Mic Bias", NULL, "Int Mic"},
104 };
105 
106 /*
107  * Logic for a wm8731 as connected on a at91sam9g20ek board.
108  */
109 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
110 {
111         struct snd_soc_codec *codec = rtd->codec;
112         struct snd_soc_dai *codec_dai = rtd->codec_dai;
113         struct snd_soc_dapm_context *dapm = &codec->dapm;
114         int ret;
115 
116         printk(KERN_DEBUG
117                         "at91sam9g20ek_wm8731 "
118                         ": at91sam9g20ek_wm8731_init() called\n");
119 
120         ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
121                 MCLK_RATE, SND_SOC_CLOCK_IN);
122         if (ret < 0) {
123                 printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret);
124                 return ret;
125         }
126 
127         /* not connected */
128         snd_soc_dapm_nc_pin(dapm, "RLINEIN");
129         snd_soc_dapm_nc_pin(dapm, "LLINEIN");
130 
131 #ifndef ENABLE_MIC_INPUT
132         snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic");
133 #endif
134 
135         return 0;
136 }
137 
138 static struct snd_soc_dai_link at91sam9g20ek_dai = {
139         .name = "WM8731",
140         .stream_name = "WM8731 PCM",
141         .cpu_dai_name = "at91rm9200_ssc.0",
142         .codec_dai_name = "wm8731-hifi",
143         .init = at91sam9g20ek_wm8731_init,
144         .platform_name = "at91rm9200_ssc.0",
145         .codec_name = "wm8731.0-001b",
146         .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
147                    SND_SOC_DAIFMT_CBM_CFM,
148 };
149 
150 static struct snd_soc_card snd_soc_at91sam9g20ek = {
151         .name = "AT91SAMG20-EK",
152         .owner = THIS_MODULE,
153         .dai_link = &at91sam9g20ek_dai,
154         .num_links = 1,
155         .set_bias_level = at91sam9g20ek_set_bias_level,
156 
157         .dapm_widgets = at91sam9g20ek_dapm_widgets,
158         .num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets),
159         .dapm_routes = intercon,
160         .num_dapm_routes = ARRAY_SIZE(intercon),
161 };
162 
163 static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
164 {
165         struct device_node *np = pdev->dev.of_node;
166         struct device_node *codec_np, *cpu_np;
167         struct clk *pllb;
168         struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
169         int ret;
170 
171         if (!np) {
172                 return -ENODEV;
173         }
174 
175         ret = atmel_ssc_set_audio(0);
176         if (ret) {
177                 dev_err(&pdev->dev, "ssc channel is not valid\n");
178                 return -EINVAL;
179         }
180 
181         /*
182          * Codec MCLK is supplied by PCK0 - set it up.
183          */
184         mclk = clk_get(NULL, "pck0");
185         if (IS_ERR(mclk)) {
186                 printk(KERN_ERR "ASoC: Failed to get MCLK\n");
187                 ret = PTR_ERR(mclk);
188                 goto err;
189         }
190 
191         pllb = clk_get(NULL, "pllb");
192         if (IS_ERR(pllb)) {
193                 printk(KERN_ERR "ASoC: Failed to get PLLB\n");
194                 ret = PTR_ERR(pllb);
195                 goto err_mclk;
196         }
197         ret = clk_set_parent(mclk, pllb);
198         clk_put(pllb);
199         if (ret != 0) {
200                 printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
201                 goto err_mclk;
202         }
203 
204         clk_set_rate(mclk, MCLK_RATE);
205 
206         card->dev = &pdev->dev;
207 
208         /* Parse device node info */
209         ret = snd_soc_of_parse_card_name(card, "atmel,model");
210         if (ret)
211                 goto err;
212 
213         ret = snd_soc_of_parse_audio_routing(card,
214                 "atmel,audio-routing");
215         if (ret)
216                 goto err;
217 
218         /* Parse codec info */
219         at91sam9g20ek_dai.codec_name = NULL;
220         codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
221         if (!codec_np) {
222                 dev_err(&pdev->dev, "codec info missing\n");
223                 return -EINVAL;
224         }
225         at91sam9g20ek_dai.codec_of_node = codec_np;
226 
227         /* Parse dai and platform info */
228         at91sam9g20ek_dai.cpu_dai_name = NULL;
229         at91sam9g20ek_dai.platform_name = NULL;
230         cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
231         if (!cpu_np) {
232                 dev_err(&pdev->dev, "dai and pcm info missing\n");
233                 return -EINVAL;
234         }
235         at91sam9g20ek_dai.cpu_of_node = cpu_np;
236         at91sam9g20ek_dai.platform_of_node = cpu_np;
237 
238         of_node_put(codec_np);
239         of_node_put(cpu_np);
240 
241         ret = snd_soc_register_card(card);
242         if (ret) {
243                 printk(KERN_ERR "ASoC: snd_soc_register_card() failed\n");
244         }
245 
246         return ret;
247 
248 err_mclk:
249         clk_put(mclk);
250         mclk = NULL;
251 err:
252         atmel_ssc_put_audio(0);
253         return ret;
254 }
255 
256 static int at91sam9g20ek_audio_remove(struct platform_device *pdev)
257 {
258         struct snd_soc_card *card = platform_get_drvdata(pdev);
259 
260         clk_disable(mclk);
261         mclk = NULL;
262         snd_soc_unregister_card(card);
263         atmel_ssc_put_audio(0);
264 
265         return 0;
266 }
267 
268 #ifdef CONFIG_OF
269 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
270         { .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
271         { }
272 };
273 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
274 #endif
275 
276 static struct platform_driver at91sam9g20ek_audio_driver = {
277         .driver = {
278                 .name   = "at91sam9g20ek-audio",
279                 .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
280         },
281         .probe  = at91sam9g20ek_audio_probe,
282         .remove = at91sam9g20ek_audio_remove,
283 };
284 
285 module_platform_driver(at91sam9g20ek_audio_driver);
286 
287 /* Module information */
288 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
289 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
290 MODULE_ALIAS("platform:at91sam9g20ek-audio");
291 MODULE_LICENSE("GPL");
292 

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