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");