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
  41 #include <linux/atmel-ssc.h>
  42
  43 #include <sound/core.h>
  44 #include <sound/pcm.h>
  45 #include <sound/pcm_params.h>
  46 #include <sound/soc.h>
  47 #include <sound/soc-dapm.h>
  48
  49 #include <asm/mach-types.h>
  50 #include <mach/hardware.h>
  51 #include <mach/gpio.h>
  52
  53 #include "../codecs/wm8731.h"
  54 #include "atmel-pcm.h"
  55 #include "atmel_ssc_dai.h"
  56
  57 #define MCLK_RATE 12000000
  58
  59 /*
  60  * As shipped the board does not have inputs.  However, it is relatively
  61  * straightforward to modify the board to hook them up so support is left
  62  * in the driver.
  63  */
  64 #undef ENABLE_MIC_INPUT
  65
  66 static struct clk *mclk;
  67
  68 static int at91sam9g20ek_hw_params(struct snd_pcm_substream *substream,
  69         struct snd_pcm_hw_params *params)
  70 {
  71         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  72         struct snd_soc_dai *codec_dai = rtd->codec_dai;
  73         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  74         int ret;
  75
  76         /* set codec DAI configuration */
  77         ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
  78                 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
  79         if (ret < 0)
  80                 return ret;
  81
  82         /* set cpu DAI configuration */
  83         ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
  84                 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
  85         if (ret < 0)
  86                 return ret;
  87
  88         return 0;
  89 }
  90
  91 static struct snd_soc_ops at91sam9g20ek_ops = {
  92         .hw_params = at91sam9g20ek_hw_params,
  93 };
  94
  95 static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
  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         int ret;
 144
 145         printk(KERN_DEBUG
 146                         "at91sam9g20ek_wm8731 "
 147                         ": at91sam9g20ek_wm8731_init() called\n");
 148
 149         ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
 150                 MCLK_RATE, SND_SOC_CLOCK_IN);
 151         if (ret < 0) {
 152                 printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret);
 153                 return ret;
 154         }
 155
 156         /* Add specific widgets */
 157         snd_soc_dapm_new_controls(codec, at91sam9g20ek_dapm_widgets,
 158                                   ARRAY_SIZE(at91sam9g20ek_dapm_widgets));
 159         /* Set up specific audio path interconnects */
 160         snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
 161
 162         /* not connected */
 163         snd_soc_dapm_nc_pin(codec, "RLINEIN");
 164         snd_soc_dapm_nc_pin(codec, "LLINEIN");
 165
 166 #ifdef ENABLE_MIC_INPUT
 167         snd_soc_dapm_enable_pin(codec, "Int Mic");
 168 #else
 169         snd_soc_dapm_nc_pin(codec, "Int Mic");
 170 #endif
 171
 172         /* always connected */
 173         snd_soc_dapm_enable_pin(codec, "Ext Spk");
 174
 175         snd_soc_dapm_sync(codec);
 176
 177         return 0;
 178 }
 179
 180 static struct snd_soc_dai_link at91sam9g20ek_dai = {
 181         .name = "WM8731",
 182         .stream_name = "WM8731 PCM",
 183         .cpu_dai_name = "atmel-ssc-dai.0",
 184         .codec_dai_name = "wm8731-hifi",
 185         .init = at91sam9g20ek_wm8731_init,
 186         .platform_name = "atmel-pcm-audio",
 187         .codec_name = "wm8731-codec.0-001b",
 188         .ops = &at91sam9g20ek_ops,
 189 };
 190
 191 static struct snd_soc_card snd_soc_at91sam9g20ek = {
 192         .name = "AT91SAMG20-EK",
 193         .dai_link = &at91sam9g20ek_dai,
 194         .num_links = 1,
 195         .set_bias_level = at91sam9g20ek_set_bias_level,
 196 };
 197
 198 static struct platform_device *at91sam9g20ek_snd_device;
 199
 200 static int __init at91sam9g20ek_init(void)
 201 {
 202         struct clk *pllb;
 203         int ret;
 204
 205         if (!(machine_is_at91sam9g20ek() || machine_is_at91sam9g20ek_2mmc()))
 206                 return -ENODEV;
 207
 208         ret = atmel_ssc_set_audio(0);
 209         if (ret != 0) {
 210                 pr_err("Failed to set SSC 0 for audio: %d\n", ret);
 211                 return ret;
 212         }
 213
 214         /*
 215          * Codec MCLK is supplied by PCK0 - set it up.
 216          */
 217         mclk = clk_get(NULL, "pck0");
 218         if (IS_ERR(mclk)) {
 219                 printk(KERN_ERR "ASoC: Failed to get MCLK\n");
 220                 ret = PTR_ERR(mclk);
 221                 goto err;
 222         }
 223
 224         pllb = clk_get(NULL, "pllb");
 225         if (IS_ERR(mclk)) {
 226                 printk(KERN_ERR "ASoC: Failed to get PLLB\n");
 227                 ret = PTR_ERR(mclk);
 228                 goto err_mclk;
 229         }
 230         ret = clk_set_parent(mclk, pllb);
 231         clk_put(pllb);
 232         if (ret != 0) {
 233                 printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
 234                 goto err_mclk;
 235         }
 236
 237         clk_set_rate(mclk, MCLK_RATE);
 238
 239         at91sam9g20ek_snd_device = platform_device_alloc("soc-audio", -1);
 240         if (!at91sam9g20ek_snd_device) {
 241                 printk(KERN_ERR "ASoC: Platform device allocation failed\n");
 242                 ret = -ENOMEM;
 243         }
 244
 245         platform_set_drvdata(at91sam9g20ek_snd_device,
 246                         &snd_soc_at91sam9g20ek);
 247
 248         ret = platform_device_add(at91sam9g20ek_snd_device);
 249         if (ret) {
 250                 printk(KERN_ERR "ASoC: Platform device allocation failed\n");
 251                 platform_device_put(at91sam9g20ek_snd_device);
 252         }
 253
 254         return ret;
 255
 256 err_mclk:
 257         clk_put(mclk);
 258         mclk = NULL;
 259 err:
 260         return ret;
 261 }
 262
 263 static void __exit at91sam9g20ek_exit(void)
 264 {
 265         platform_device_unregister(at91sam9g20ek_snd_device);
 266         at91sam9g20ek_snd_device = NULL;
 267         clk_put(mclk);
 268         mclk = NULL;
 269 }
 270
 271 module_init(at91sam9g20ek_init);
 272 module_exit(at91sam9g20ek_exit);
 273
 274 /* Module information */
 275 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
 276 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
 277 MODULE_LICENSE("GPL");