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
  48 #include <asm/mach-types.h>
  49 #include <mach/hardware.h>
  50 #include <mach/gpio.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         /* Add specific widgets */
 158         snd_soc_dapm_new_controls(dapm, at91sam9g20ek_dapm_widgets,
 159                                   ARRAY_SIZE(at91sam9g20ek_dapm_widgets));
 160         /* Set up specific audio path interconnects */
 161         snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon));
 162
 163         /* not connected */
 164         snd_soc_dapm_nc_pin(dapm, "RLINEIN");
 165         snd_soc_dapm_nc_pin(dapm, "LLINEIN");
 166
 167 #ifdef ENABLE_MIC_INPUT
 168         snd_soc_dapm_enable_pin(dapm, "Int Mic");
 169 #else
 170         snd_soc_dapm_nc_pin(dapm, "Int Mic");
 171 #endif
 172
 173         /* always connected */
 174         snd_soc_dapm_enable_pin(dapm, "Ext Spk");
 175
 176         return 0;
 177 }
 178
 179 static struct snd_soc_dai_link at91sam9g20ek_dai = {
 180         .name = "WM8731",
 181         .stream_name = "WM8731 PCM",
 182         .cpu_dai_name = "atmel-ssc-dai.0",
 183         .codec_dai_name = "wm8731-hifi",
 184         .init = at91sam9g20ek_wm8731_init,
 185         .platform_name = "atmel-pcm-audio",
 186         .codec_name = "wm8731.0-001b",
 187         .ops = &at91sam9g20ek_ops,
 188 };
 189
 190 static struct snd_soc_card snd_soc_at91sam9g20ek = {
 191         .name = "AT91SAMG20-EK",
 192         .dai_link = &at91sam9g20ek_dai,
 193         .num_links = 1,
 194         .set_bias_level = at91sam9g20ek_set_bias_level,
 195 };
 196
 197 static struct platform_device *at91sam9g20ek_snd_device;
 198
 199 static int __init at91sam9g20ek_init(void)
 200 {
 201         struct clk *pllb;
 202         int ret;
 203
 204         if (!(machine_is_at91sam9g20ek() || machine_is_at91sam9g20ek_2mmc()))
 205                 return -ENODEV;
 206
 207         ret = atmel_ssc_set_audio(0);
 208         if (ret != 0) {
 209                 pr_err("Failed to set SSC 0 for audio: %d\n", ret);
 210                 return ret;
 211         }
 212
 213         /*
 214          * Codec MCLK is supplied by PCK0 - set it up.
 215          */
 216         mclk = clk_get(NULL, "pck0");
 217         if (IS_ERR(mclk)) {
 218                 printk(KERN_ERR "ASoC: Failed to get MCLK\n");
 219                 ret = PTR_ERR(mclk);
 220                 goto err;
 221         }
 222
 223         pllb = clk_get(NULL, "pllb");
 224         if (IS_ERR(pllb)) {
 225                 printk(KERN_ERR "ASoC: Failed to get PLLB\n");
 226                 ret = PTR_ERR(pllb);
 227                 goto err_mclk;
 228         }
 229         ret = clk_set_parent(mclk, pllb);
 230         clk_put(pllb);
 231         if (ret != 0) {
 232                 printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
 233                 goto err_mclk;
 234         }
 235
 236         clk_set_rate(mclk, MCLK_RATE);
 237
 238         at91sam9g20ek_snd_device = platform_device_alloc("soc-audio", -1);
 239         if (!at91sam9g20ek_snd_device) {
 240                 printk(KERN_ERR "ASoC: Platform device allocation failed\n");
 241                 ret = -ENOMEM;
 242                 goto err_mclk;
 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                 goto err_device_add;
 252         }
 253
 254         return ret;
 255
 256 err_device_add:
 257         platform_device_put(at91sam9g20ek_snd_device);
 258 err_mclk:
 259         clk_put(mclk);
 260         mclk = NULL;
 261 err:
 262         return ret;
 263 }
 264
 265 static void __exit at91sam9g20ek_exit(void)
 266 {
 267         platform_device_unregister(at91sam9g20ek_snd_device);
 268         at91sam9g20ek_snd_device = NULL;
 269         clk_put(mclk);
 270         mclk = NULL;
 271 }
 272
 273 module_init(at91sam9g20ek_init);
 274 module_exit(at91sam9g20ek_exit);
 275
 276 /* Module information */
 277 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
 278 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
 279 MODULE_LICENSE("GPL");