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
  51 #include "../codecs/wm8731.h"
  52 #include "atmel-pcm.h"
  53 #include "atmel_ssc_dai.h"
  54
  55 #define MCLK_RATE 12000000
  56
  57 /*
  58  * As shipped the board does not have inputs.  However, it is relatively
  59  * straightforward to modify the board to hook them up so support is left
  60  * in the driver.
  61  */
  62 #undef ENABLE_MIC_INPUT
  63
  64 static struct clk *mclk;
  65
  66 static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
  67                                         struct snd_soc_dapm_context *dapm,
  68                                         enum snd_soc_bias_level level)
  69 {
  70         static int mclk_on;
  71         int ret = 0;
  72
  73         switch (level) {
  74         case SND_SOC_BIAS_ON:
  75         case SND_SOC_BIAS_PREPARE:
  76                 if (!mclk_on)
  77                         ret = clk_enable(mclk);
  78                 if (ret == 0)
  79                         mclk_on = 1;
  80                 break;
  81
  82         case SND_SOC_BIAS_OFF:
  83         case SND_SOC_BIAS_STANDBY:
  84                 if (mclk_on)
  85                         clk_disable(mclk);
  86                 mclk_on = 0;
  87                 break;
  88         }
  89
  90         return ret;
  91 }
  92
  93 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
  94         SND_SOC_DAPM_MIC("Int Mic", NULL),
  95         SND_SOC_DAPM_SPK("Ext Spk", NULL),
  96 };
  97
  98 static const struct snd_soc_dapm_route intercon[] = {
  99
 100         /* speaker connected to LHPOUT */
 101         {"Ext Spk", NULL, "LHPOUT"},
 102
 103         /* mic is connected to Mic Jack, with WM8731 Mic Bias */
 104         {"MICIN", NULL, "Mic Bias"},
 105         {"Mic Bias", NULL, "Int Mic"},
 106 };
 107
 108 /*
 109  * Logic for a wm8731 as connected on a at91sam9g20ek board.
 110  */
 111 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
 112 {
 113         struct snd_soc_codec *codec = rtd->codec;
 114         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 115         struct snd_soc_dapm_context *dapm = &codec->dapm;
 116         int ret;
 117
 118         printk(KERN_DEBUG
 119                         "at91sam9g20ek_wm8731 "
 120                         ": at91sam9g20ek_wm8731_init() called\n");
 121
 122         ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
 123                 MCLK_RATE, SND_SOC_CLOCK_IN);
 124         if (ret < 0) {
 125                 printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret);
 126                 return ret;
 127         }
 128
 129         /* not connected */
 130         snd_soc_dapm_nc_pin(dapm, "RLINEIN");
 131         snd_soc_dapm_nc_pin(dapm, "LLINEIN");
 132
 133 #ifndef ENABLE_MIC_INPUT
 134         snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic");
 135 #endif
 136
 137         return 0;
 138 }
 139
 140 static struct snd_soc_dai_link at91sam9g20ek_dai = {
 141         .name = "WM8731",
 142         .stream_name = "WM8731 PCM",
 143         .cpu_dai_name = "at91rm9200_ssc.0",
 144         .codec_dai_name = "wm8731-hifi",
 145         .init = at91sam9g20ek_wm8731_init,
 146         .platform_name = "at91rm9200_ssc.0",
 147         .codec_name = "wm8731.0-001b",
 148         .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 149                    SND_SOC_DAIFMT_CBM_CFM,
 150 };
 151
 152 static struct snd_soc_card snd_soc_at91sam9g20ek = {
 153         .name = "AT91SAMG20-EK",
 154         .owner = THIS_MODULE,
 155         .dai_link = &at91sam9g20ek_dai,
 156         .num_links = 1,
 157         .set_bias_level = at91sam9g20ek_set_bias_level,
 158
 159         .dapm_widgets = at91sam9g20ek_dapm_widgets,
 160         .num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets),
 161         .dapm_routes = intercon,
 162         .num_dapm_routes = ARRAY_SIZE(intercon),
 163 };
 164
 165 static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
 166 {
 167         struct device_node *np = pdev->dev.of_node;
 168         struct device_node *codec_np, *cpu_np;
 169         struct clk *pllb;
 170         struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
 171         int ret;
 172
 173         if (!np) {
 174                 if (!(machine_is_at91sam9g20ek() ||
 175                         machine_is_at91sam9g20ek_2mmc()))
 176                         return -ENODEV;
 177         }
 178
 179         ret = atmel_ssc_set_audio(0);
 180         if (ret) {
 181                 dev_err(&pdev->dev, "ssc channel is not valid\n");
 182                 return -EINVAL;
 183         }
 184
 185         /*
 186          * Codec MCLK is supplied by PCK0 - set it up.
 187          */
 188         mclk = clk_get(NULL, "pck0");
 189         if (IS_ERR(mclk)) {
 190                 printk(KERN_ERR "ASoC: Failed to get MCLK\n");
 191                 ret = PTR_ERR(mclk);
 192                 goto err;
 193         }
 194
 195         pllb = clk_get(NULL, "pllb");
 196         if (IS_ERR(pllb)) {
 197                 printk(KERN_ERR "ASoC: Failed to get PLLB\n");
 198                 ret = PTR_ERR(pllb);
 199                 goto err_mclk;
 200         }
 201         ret = clk_set_parent(mclk, pllb);
 202         clk_put(pllb);
 203         if (ret != 0) {
 204                 printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
 205                 goto err_mclk;
 206         }
 207
 208         clk_set_rate(mclk, MCLK_RATE);
 209
 210         card->dev = &pdev->dev;
 211
 212         /* Parse device node info */
 213         if (np) {
 214                 ret = snd_soc_of_parse_card_name(card, "atmel,model");
 215                 if (ret)
 216                         goto err;
 217
 218                 ret = snd_soc_of_parse_audio_routing(card,
 219                         "atmel,audio-routing");
 220                 if (ret)
 221                         goto err;
 222
 223                 /* Parse codec info */
 224                 at91sam9g20ek_dai.codec_name = NULL;
 225                 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
 226                 if (!codec_np) {
 227                         dev_err(&pdev->dev, "codec info missing\n");
 228                         return -EINVAL;
 229                 }
 230                 at91sam9g20ek_dai.codec_of_node = codec_np;
 231
 232                 /* Parse dai and platform info */
 233                 at91sam9g20ek_dai.cpu_dai_name = NULL;
 234                 at91sam9g20ek_dai.platform_name = NULL;
 235                 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
 236                 if (!cpu_np) {
 237                         dev_err(&pdev->dev, "dai and pcm info missing\n");
 238                         return -EINVAL;
 239                 }
 240                 at91sam9g20ek_dai.cpu_of_node = cpu_np;
 241                 at91sam9g20ek_dai.platform_of_node = cpu_np;
 242
 243                 of_node_put(codec_np);
 244                 of_node_put(cpu_np);
 245         }
 246
 247         ret = snd_soc_register_card(card);
 248         if (ret) {
 249                 printk(KERN_ERR "ASoC: snd_soc_register_card() failed\n");
 250         }
 251
 252         return ret;
 253
 254 err_mclk:
 255         clk_put(mclk);
 256         mclk = NULL;
 257 err:
 258         atmel_ssc_put_audio(0);
 259         return ret;
 260 }
 261
 262 static int at91sam9g20ek_audio_remove(struct platform_device *pdev)
 263 {
 264         struct snd_soc_card *card = platform_get_drvdata(pdev);
 265
 266         clk_disable(mclk);
 267         mclk = NULL;
 268         snd_soc_unregister_card(card);
 269         atmel_ssc_put_audio(0);
 270
 271         return 0;
 272 }
 273
 274 #ifdef CONFIG_OF
 275 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
 276         { .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
 277         { }
 278 };
 279 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
 280 #endif
 281
 282 static struct platform_driver at91sam9g20ek_audio_driver = {
 283         .driver = {
 284                 .name   = "at91sam9g20ek-audio",
 285                 .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
 286         },
 287         .probe  = at91sam9g20ek_audio_probe,
 288         .remove = at91sam9g20ek_audio_remove,
 289 };
 290
 291 module_platform_driver(at91sam9g20ek_audio_driver);
 292
 293 /* Module information */
 294 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
 295 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
 296 MODULE_ALIAS("platform:at91sam9g20ek-audio");
 297 MODULE_LICENSE("GPL");