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");