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/pinctrl/consumer.h>
  42
  43 #include <linux/atmel-ssc.h>
  44
  45 #include <sound/core.h>
  46 #include <sound/pcm.h>
  47 #include <sound/pcm_params.h>
  48 #include <sound/soc.h>
  49
  50 #include <asm/mach-types.h>
  51 #include <mach/hardware.h>
  52 #include <mach/gpio.h>
  53
  54 #include "../codecs/wm8731.h"
  55 #include "atmel-pcm.h"
  56 #include "atmel_ssc_dai.h"
  57
  58 #define MCLK_RATE 12000000
  59
  60 /*
  61  * As shipped the board does not have inputs.  However, it is relatively
  62  * straightforward to modify the board to hook them up so support is left
  63  * in the driver.
  64  */
  65 #undef ENABLE_MIC_INPUT
  66
  67 static struct clk *mclk;
  68
  69 static int at91sam9g20ek_hw_params(struct snd_pcm_substream *substream,
  70         struct snd_pcm_hw_params *params)
  71 {
  72         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  73         struct snd_soc_dai *codec_dai = rtd->codec_dai;
  74         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  75         int ret;
  76
  77         /* set codec DAI configuration */
  78         ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
  79                 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
  80         if (ret < 0)
  81                 return ret;
  82
  83         /* set cpu DAI configuration */
  84         ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
  85                 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
  86         if (ret < 0)
  87                 return ret;
  88
  89         return 0;
  90 }
  91
  92 static struct snd_soc_ops at91sam9g20ek_ops = {
  93         .hw_params = at91sam9g20ek_hw_params,
  94 };
  95
  96 static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
  97                                         struct snd_soc_dapm_context *dapm,
  98                                         enum snd_soc_bias_level level)
  99 {
 100         static int mclk_on;
 101         int ret = 0;
 102
 103         switch (level) {
 104         case SND_SOC_BIAS_ON:
 105         case SND_SOC_BIAS_PREPARE:
 106                 if (!mclk_on)
 107                         ret = clk_enable(mclk);
 108                 if (ret == 0)
 109                         mclk_on = 1;
 110                 break;
 111
 112         case SND_SOC_BIAS_OFF:
 113         case SND_SOC_BIAS_STANDBY:
 114                 if (mclk_on)
 115                         clk_disable(mclk);
 116                 mclk_on = 0;
 117                 break;
 118         }
 119
 120         return ret;
 121 }
 122
 123 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
 124         SND_SOC_DAPM_MIC("Int Mic", NULL),
 125         SND_SOC_DAPM_SPK("Ext Spk", NULL),
 126 };
 127
 128 static const struct snd_soc_dapm_route intercon[] = {
 129
 130         /* speaker connected to LHPOUT */
 131         {"Ext Spk", NULL, "LHPOUT"},
 132
 133         /* mic is connected to Mic Jack, with WM8731 Mic Bias */
 134         {"MICIN", NULL, "Mic Bias"},
 135         {"Mic Bias", NULL, "Int Mic"},
 136 };
 137
 138 /*
 139  * Logic for a wm8731 as connected on a at91sam9g20ek board.
 140  */
 141 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
 142 {
 143         struct snd_soc_codec *codec = rtd->codec;
 144         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 145         struct snd_soc_dapm_context *dapm = &codec->dapm;
 146         int ret;
 147
 148         printk(KERN_DEBUG
 149                         "at91sam9g20ek_wm8731 "
 150                         ": at91sam9g20ek_wm8731_init() called\n");
 151
 152         ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
 153                 MCLK_RATE, SND_SOC_CLOCK_IN);
 154         if (ret < 0) {
 155                 printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret);
 156                 return ret;
 157         }
 158
 159         /* Add specific widgets */
 160         snd_soc_dapm_new_controls(dapm, at91sam9g20ek_dapm_widgets,
 161                                   ARRAY_SIZE(at91sam9g20ek_dapm_widgets));
 162         /* Set up specific audio path interconnects */
 163         snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon));
 164
 165         /* not connected */
 166         snd_soc_dapm_nc_pin(dapm, "RLINEIN");
 167         snd_soc_dapm_nc_pin(dapm, "LLINEIN");
 168
 169 #ifdef ENABLE_MIC_INPUT
 170         snd_soc_dapm_enable_pin(dapm, "Int Mic");
 171 #else
 172         snd_soc_dapm_nc_pin(dapm, "Int Mic");
 173 #endif
 174
 175         /* always connected */
 176         snd_soc_dapm_enable_pin(dapm, "Ext Spk");
 177
 178         return 0;
 179 }
 180
 181 static struct snd_soc_dai_link at91sam9g20ek_dai = {
 182         .name = "WM8731",
 183         .stream_name = "WM8731 PCM",
 184         .cpu_dai_name = "at91rm9200_ssc.0",
 185         .codec_dai_name = "wm8731-hifi",
 186         .init = at91sam9g20ek_wm8731_init,
 187         .platform_name = "at91rm9200_ssc.0",
 188         .codec_name = "wm8731.0-001b",
 189         .ops = &at91sam9g20ek_ops,
 190 };
 191
 192 static struct snd_soc_card snd_soc_at91sam9g20ek = {
 193         .name = "AT91SAMG20-EK",
 194         .owner = THIS_MODULE,
 195         .dai_link = &at91sam9g20ek_dai,
 196         .num_links = 1,
 197         .set_bias_level = at91sam9g20ek_set_bias_level,
 198 };
 199
 200 static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
 201 {
 202         struct device_node *np = pdev->dev.of_node;
 203         struct device_node *codec_np, *cpu_np;
 204         struct clk *pllb;
 205         struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
 206         struct pinctrl *pinctrl;
 207         int ret;
 208
 209         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 210         if (IS_ERR(pinctrl)) {
 211                 dev_err(&pdev->dev, "Failed to request pinctrl for mck\n");
 212                 return PTR_ERR(pinctrl);
 213         }
 214
 215         if (!np) {
 216                 if (!(machine_is_at91sam9g20ek() ||
 217                         machine_is_at91sam9g20ek_2mmc()))
 218                         return -ENODEV;
 219         }
 220
 221         ret = atmel_ssc_set_audio(0);
 222         if (ret) {
 223                 dev_err(&pdev->dev, "ssc channel is not valid\n");
 224                 return -EINVAL;
 225         }
 226
 227         /*
 228          * Codec MCLK is supplied by PCK0 - set it up.
 229          */
 230         mclk = clk_get(NULL, "pck0");
 231         if (IS_ERR(mclk)) {
 232                 printk(KERN_ERR "ASoC: Failed to get MCLK\n");
 233                 ret = PTR_ERR(mclk);
 234                 goto err;
 235         }
 236
 237         pllb = clk_get(NULL, "pllb");
 238         if (IS_ERR(pllb)) {
 239                 printk(KERN_ERR "ASoC: Failed to get PLLB\n");
 240                 ret = PTR_ERR(pllb);
 241                 goto err_mclk;
 242         }
 243         ret = clk_set_parent(mclk, pllb);
 244         clk_put(pllb);
 245         if (ret != 0) {
 246                 printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
 247                 goto err_mclk;
 248         }
 249
 250         clk_set_rate(mclk, MCLK_RATE);
 251
 252         card->dev = &pdev->dev;
 253
 254         /* Parse device node info */
 255         if (np) {
 256                 ret = snd_soc_of_parse_card_name(card, "atmel,model");
 257                 if (ret)
 258                         goto err;
 259
 260                 ret = snd_soc_of_parse_audio_routing(card,
 261                         "atmel,audio-routing");
 262                 if (ret)
 263                         goto err;
 264
 265                 /* Parse codec info */
 266                 at91sam9g20ek_dai.codec_name = NULL;
 267                 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
 268                 if (!codec_np) {
 269                         dev_err(&pdev->dev, "codec info missing\n");
 270                         return -EINVAL;
 271                 }
 272                 at91sam9g20ek_dai.codec_of_node = codec_np;
 273
 274                 /* Parse dai and platform info */
 275                 at91sam9g20ek_dai.cpu_dai_name = NULL;
 276                 at91sam9g20ek_dai.platform_name = NULL;
 277                 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
 278                 if (!cpu_np) {
 279                         dev_err(&pdev->dev, "dai and pcm info missing\n");
 280                         return -EINVAL;
 281                 }
 282                 at91sam9g20ek_dai.cpu_of_node = cpu_np;
 283                 at91sam9g20ek_dai.platform_of_node = cpu_np;
 284
 285                 of_node_put(codec_np);
 286                 of_node_put(cpu_np);
 287         }
 288
 289         ret = snd_soc_register_card(card);
 290         if (ret) {
 291                 printk(KERN_ERR "ASoC: snd_soc_register_card() failed\n");
 292         }
 293
 294         return ret;
 295
 296 err_mclk:
 297         clk_put(mclk);
 298         mclk = NULL;
 299 err:
 300         atmel_ssc_put_audio(0);
 301         return ret;
 302 }
 303
 304 static int at91sam9g20ek_audio_remove(struct platform_device *pdev)
 305 {
 306         struct snd_soc_card *card = platform_get_drvdata(pdev);
 307
 308         clk_disable(mclk);
 309         mclk = NULL;
 310         snd_soc_unregister_card(card);
 311         atmel_ssc_put_audio(0);
 312
 313         return 0;
 314 }
 315
 316 #ifdef CONFIG_OF
 317 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
 318         { .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
 319         { }
 320 };
 321 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
 322 #endif
 323
 324 static struct platform_driver at91sam9g20ek_audio_driver = {
 325         .driver = {
 326                 .name   = "at91sam9g20ek-audio",
 327                 .owner  = THIS_MODULE,
 328                 .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
 329         },
 330         .probe  = at91sam9g20ek_audio_probe,
 331         .remove = at91sam9g20ek_audio_remove,
 332 };
 333
 334 module_platform_driver(at91sam9g20ek_audio_driver);
 335
 336 /* Module information */
 337 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
 338 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
 339 MODULE_ALIAS("platform:at91sam9g20ek-audio");
 340 MODULE_LICENSE("GPL");