Version:  2.0.40 2.2.26 2.4.37 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2

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/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 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us