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 #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                                         struct snd_soc_dapm_context *dapm,
  97                                         enum snd_soc_bias_level level)
  98 {
  99         static int mclk_on;
 100         int ret = 0;
 101
 102         switch (level) {
 103         case SND_SOC_BIAS_ON:
 104         case SND_SOC_BIAS_PREPARE:
 105                 if (!mclk_on)
 106                         ret = clk_enable(mclk);
 107                 if (ret == 0)
 108                         mclk_on = 1;
 109                 break;
 110
 111         case SND_SOC_BIAS_OFF:
 112         case SND_SOC_BIAS_STANDBY:
 113                 if (mclk_on)
 114                         clk_disable(mclk);
 115                 mclk_on = 0;
 116                 break;
 117         }
 118
 119         return ret;
 120 }
 121
 122 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
 123         SND_SOC_DAPM_MIC("Int Mic", NULL),
 124         SND_SOC_DAPM_SPK("Ext Spk", NULL),
 125 };
 126
 127 static const struct snd_soc_dapm_route intercon[] = {
 128
 129         /* speaker connected to LHPOUT */
 130         {"Ext Spk", NULL, "LHPOUT"},
 131
 132         /* mic is connected to Mic Jack, with WM8731 Mic Bias */
 133         {"MICIN", NULL, "Mic Bias"},
 134         {"Mic Bias", NULL, "Int Mic"},
 135 };
 136
 137 /*
 138  * Logic for a wm8731 as connected on a at91sam9g20ek board.
 139  */
 140 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
 141 {
 142         struct snd_soc_codec *codec = rtd->codec;
 143         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 144         struct snd_soc_dapm_context *dapm = &codec->dapm;
 145         int ret;
 146
 147         printk(KERN_DEBUG
 148                         "at91sam9g20ek_wm8731 "
 149                         ": at91sam9g20ek_wm8731_init() called\n");
 150
 151         ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
 152                 MCLK_RATE, SND_SOC_CLOCK_IN);
 153         if (ret < 0) {
 154                 printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret);
 155                 return ret;
 156         }
 157
 158         /* Add specific widgets */
 159         snd_soc_dapm_new_controls(dapm, at91sam9g20ek_dapm_widgets,
 160                                   ARRAY_SIZE(at91sam9g20ek_dapm_widgets));
 161         /* Set up specific audio path interconnects */
 162         snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon));
 163
 164         /* not connected */
 165         snd_soc_dapm_nc_pin(dapm, "RLINEIN");
 166         snd_soc_dapm_nc_pin(dapm, "LLINEIN");
 167
 168 #ifdef ENABLE_MIC_INPUT
 169         snd_soc_dapm_enable_pin(dapm, "Int Mic");
 170 #else
 171         snd_soc_dapm_nc_pin(dapm, "Int Mic");
 172 #endif
 173
 174         /* always connected */
 175         snd_soc_dapm_enable_pin(dapm, "Ext Spk");
 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 = "at91rm9200_ssc.0",
 184         .codec_dai_name = "wm8731-hifi",
 185         .init = at91sam9g20ek_wm8731_init,
 186         .platform_name = "at91rm9200_ssc.0",
 187         .codec_name = "wm8731.0-001b",
 188         .ops = &at91sam9g20ek_ops,
 189 };
 190
 191 static struct snd_soc_card snd_soc_at91sam9g20ek = {
 192         .name = "AT91SAMG20-EK",
 193         .owner = THIS_MODULE,
 194         .dai_link = &at91sam9g20ek_dai,
 195         .num_links = 1,
 196         .set_bias_level = at91sam9g20ek_set_bias_level,
 197 };
 198
 199 static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
 200 {
 201         struct device_node *np = pdev->dev.of_node;
 202         struct device_node *codec_np, *cpu_np;
 203         struct clk *pllb;
 204         struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
 205         int ret;
 206
 207         if (!np) {
 208                 if (!(machine_is_at91sam9g20ek() ||
 209                         machine_is_at91sam9g20ek_2mmc()))
 210                         return -ENODEV;
 211         }
 212
 213         ret = atmel_ssc_set_audio(0);
 214         if (ret) {
 215                 dev_err(&pdev->dev, "ssc channel is not valid\n");
 216                 return -EINVAL;
 217         }
 218
 219         /*
 220          * Codec MCLK is supplied by PCK0 - set it up.
 221          */
 222         mclk = clk_get(NULL, "pck0");
 223         if (IS_ERR(mclk)) {
 224                 printk(KERN_ERR "ASoC: Failed to get MCLK\n");
 225                 ret = PTR_ERR(mclk);
 226                 goto err;
 227         }
 228
 229         pllb = clk_get(NULL, "pllb");
 230         if (IS_ERR(pllb)) {
 231                 printk(KERN_ERR "ASoC: Failed to get PLLB\n");
 232                 ret = PTR_ERR(pllb);
 233                 goto err_mclk;
 234         }
 235         ret = clk_set_parent(mclk, pllb);
 236         clk_put(pllb);
 237         if (ret != 0) {
 238                 printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
 239                 goto err_mclk;
 240         }
 241
 242         clk_set_rate(mclk, MCLK_RATE);
 243
 244         card->dev = &pdev->dev;
 245
 246         /* Parse device node info */
 247         if (np) {
 248                 ret = snd_soc_of_parse_card_name(card, "atmel,model");
 249                 if (ret)
 250                         goto err;
 251
 252                 ret = snd_soc_of_parse_audio_routing(card,
 253                         "atmel,audio-routing");
 254                 if (ret)
 255                         goto err;
 256
 257                 /* Parse codec info */
 258                 at91sam9g20ek_dai.codec_name = NULL;
 259                 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
 260                 if (!codec_np) {
 261                         dev_err(&pdev->dev, "codec info missing\n");
 262                         return -EINVAL;
 263                 }
 264                 at91sam9g20ek_dai.codec_of_node = codec_np;
 265
 266                 /* Parse dai and platform info */
 267                 at91sam9g20ek_dai.cpu_dai_name = NULL;
 268                 at91sam9g20ek_dai.platform_name = NULL;
 269                 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
 270                 if (!cpu_np) {
 271                         dev_err(&pdev->dev, "dai and pcm info missing\n");
 272                         return -EINVAL;
 273                 }
 274                 at91sam9g20ek_dai.cpu_of_node = cpu_np;
 275                 at91sam9g20ek_dai.platform_of_node = cpu_np;
 276
 277                 of_node_put(codec_np);
 278                 of_node_put(cpu_np);
 279         }
 280
 281         ret = snd_soc_register_card(card);
 282         if (ret) {
 283                 printk(KERN_ERR "ASoC: snd_soc_register_card() failed\n");
 284         }
 285
 286         return ret;
 287
 288 err_mclk:
 289         clk_put(mclk);
 290         mclk = NULL;
 291 err:
 292         atmel_ssc_put_audio(0);
 293         return ret;
 294 }
 295
 296 static int at91sam9g20ek_audio_remove(struct platform_device *pdev)
 297 {
 298         struct snd_soc_card *card = platform_get_drvdata(pdev);
 299
 300         clk_disable(mclk);
 301         mclk = NULL;
 302         snd_soc_unregister_card(card);
 303         atmel_ssc_put_audio(0);
 304
 305         return 0;
 306 }
 307
 308 #ifdef CONFIG_OF
 309 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
 310         { .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
 311         { }
 312 };
 313 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
 314 #endif
 315
 316 static struct platform_driver at91sam9g20ek_audio_driver = {
 317         .driver = {
 318                 .name   = "at91sam9g20ek-audio",
 319                 .owner  = THIS_MODULE,
 320                 .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
 321         },
 322         .probe  = at91sam9g20ek_audio_probe,
 323         .remove = at91sam9g20ek_audio_remove,
 324 };
 325
 326 module_platform_driver(at91sam9g20ek_audio_driver);
 327
 328 /* Module information */
 329 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
 330 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
 331 MODULE_ALIAS("platform:at91sam9g20ek-audio");
 332 MODULE_LICENSE("GPL");