Logo Search packages:      
Sourcecode: alsa-driver version File versions

sam9g20_wm8731.c

/*
 * sam9g20_wm8731  --  SoC audio for AT91SAM9G20-based
 *                ATMEL AT91SAM9G20ek board.
 *
 *  Copyright (C) 2005 SAN People
 *  Copyright (C) 2008 Atmel
 *
 * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
 *
 * Based on ati_b1_wm8731.c by:
 * Frank Mandarino <fmandarino@endrelia.com>
 * Copyright 2006 Endrelia Technologies Inc.
 * Based on corgi.c by:
 * Copyright 2005 Wolfson Microelectronics PLC.
 * Copyright 2005 Openedhand Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>

#include <linux/atmel-ssc.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>

#include <asm/mach-types.h>
#include <mach/hardware.h>
#include <mach/gpio.h>

#include "../codecs/wm8731.h"
#include "atmel-pcm.h"
#include "atmel_ssc_dai.h"

#define MCLK_RATE 12000000

static struct clk *mclk;

static int at91sam9g20ek_startup(struct snd_pcm_substream *substream)
{
      struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
      struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
      int ret;

      ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK,
            MCLK_RATE, SND_SOC_CLOCK_IN);
      if (ret < 0) {
            clk_disable(mclk);
            return ret;
      }

      return 0;
}

static void at91sam9g20ek_shutdown(struct snd_pcm_substream *substream)
{
      struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);

      dev_dbg(rtd->socdev->dev, "shutdown");
}

static int at91sam9g20ek_hw_params(struct snd_pcm_substream *substream,
      struct snd_pcm_hw_params *params)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
      struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
      struct atmel_ssc_info *ssc_p = cpu_dai->private_data;
      struct ssc_device *ssc = ssc_p->ssc;
      int ret;

      unsigned int rate;
      int cmr_div, period;

      if (ssc == NULL) {
            printk(KERN_INFO "at91sam9g20ek_hw_params: ssc is NULL!\n");
            return -EINVAL;
      }

      /* set codec DAI configuration */
      ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
            SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
      if (ret < 0)
            return ret;

      /* set cpu DAI configuration */
      ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
            SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
      if (ret < 0)
            return ret;

      /*
       * The SSC clock dividers depend on the sample rate.  The CMR.DIV
       * field divides the system master clock MCK to drive the SSC TK
       * signal which provides the codec BCLK.  The TCMR.PERIOD and
       * RCMR.PERIOD fields further divide the BCLK signal to drive
       * the SSC TF and RF signals which provide the codec DACLRC and
       * ADCLRC clocks.
       *
       * The dividers were determined through trial and error, where a
       * CMR.DIV value is chosen such that the resulting BCLK value is
       * divisible, or almost divisible, by (2 * sample rate), and then
       * the TCMR.PERIOD or RCMR.PERIOD is BCLK / (2 * sample rate) - 1.
       */
      rate = params_rate(params);

      switch (rate) {
      case 8000:
            cmr_div = 55;     /* BCLK = 133MHz/(2*55) = 1.209MHz */
            period = 74;      /* LRC = BCLK/(2*(74+1)) ~= 8060,6Hz */
            break;
      case 11025:
            cmr_div = 67;     /* BCLK = 133MHz/(2*60) = 1.108MHz */
            period = 45;      /* LRC = BCLK/(2*(49+1)) = 11083,3Hz */
            break;
      case 16000:
            cmr_div = 63;     /* BCLK = 133MHz/(2*63) = 1.055MHz */
            period = 32;      /* LRC = BCLK/(2*(32+1)) = 15993,2Hz */
            break;
      case 22050:
            cmr_div = 52;     /* BCLK = 133MHz/(2*52) = 1.278MHz */
            period = 28;      /* LRC = BCLK/(2*(28+1)) = 22049Hz */
            break;
      case 32000:
            cmr_div = 66;     /* BCLK = 133MHz/(2*66) = 1.007MHz */
            period = 15;      /* LRC = BCLK/(2*(15+1)) = 31486,742Hz */
            break;
      case 44100:
            cmr_div = 29;     /* BCLK = 133MHz/(2*29) = 2.293MHz */
            period = 25;      /* LRC = BCLK/(2*(25+1)) = 44098Hz */
            break;
      case 48000:
            cmr_div = 33;     /* BCLK = 133MHz/(2*33) = 2.015MHz */
            period = 20;      /* LRC = BCLK/(2*(20+1)) = 47979,79Hz */
            break;
      case 88200:
            cmr_div = 29;     /* BCLK = 133MHz/(2*29) = 2.293MHz */
            period = 12;      /* LRC = BCLK/(2*(12+1)) = 88196Hz */
            break;
      case 96000:
            cmr_div = 23;     /* BCLK = 133MHz/(2*23) = 2.891MHz */
            period = 14;      /* LRC = BCLK/(2*(14+1)) = 96376Hz */
            break;
      default:
            printk(KERN_WARNING "unsupported rate %d"
                        " on at91sam9g20ek board\n", rate);
            return -EINVAL;
      }

      /* set the MCK divider for BCLK */
      ret = snd_soc_dai_set_clkdiv(cpu_dai, ATMEL_SSC_CMR_DIV, cmr_div);
      if (ret < 0)
            return ret;

      if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
            /* set the BCLK divider for DACLRC */
            ret = snd_soc_dai_set_clkdiv(cpu_dai,
                                    ATMEL_SSC_TCMR_PERIOD, period);
      } else {
            /* set the BCLK divider for ADCLRC */
            ret = snd_soc_dai_set_clkdiv(cpu_dai,
                                    ATMEL_SSC_RCMR_PERIOD, period);
      }
      if (ret < 0)
            return ret;

      return 0;
}

static struct snd_soc_ops at91sam9g20ek_ops = {
      .startup = at91sam9g20ek_startup,
      .hw_params = at91sam9g20ek_hw_params,
      .shutdown = at91sam9g20ek_shutdown,
};

static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
                              enum snd_soc_bias_level level)
{
      static int mclk_on;
      int ret = 0;

      switch (level) {
      case SND_SOC_BIAS_ON:
      case SND_SOC_BIAS_PREPARE:
            if (!mclk_on)
                  ret = clk_enable(mclk);
            if (ret == 0)
                  mclk_on = 1;
            break;

      case SND_SOC_BIAS_OFF:
      case SND_SOC_BIAS_STANDBY:
            if (mclk_on)
                  clk_disable(mclk);
            mclk_on = 0;
            break;
      }

      return ret;
}

static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
      SND_SOC_DAPM_MIC("Int Mic", NULL),
      SND_SOC_DAPM_SPK("Ext Spk", NULL),
};

static const struct snd_soc_dapm_route intercon[] = {

      /* speaker connected to LHPOUT */
      {"Ext Spk", NULL, "LHPOUT"},

      /* mic is connected to Mic Jack, with WM8731 Mic Bias */
      {"MICIN", NULL, "Mic Bias"},
      {"Mic Bias", NULL, "Int Mic"},
};

/*
 * Logic for a wm8731 as connected on a at91sam9g20ek board.
 */
static int at91sam9g20ek_wm8731_init(struct snd_soc_codec *codec)
{
      printk(KERN_DEBUG
                  "at91sam9g20ek_wm8731 "
                  ": at91sam9g20ek_wm8731_init() called\n");

      /* Add specific widgets */
      snd_soc_dapm_new_controls(codec, at91sam9g20ek_dapm_widgets,
                          ARRAY_SIZE(at91sam9g20ek_dapm_widgets));
      /* Set up specific audio path interconnects */
      snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));

      /* not connected */
      snd_soc_dapm_nc_pin(codec, "RLINEIN");
      snd_soc_dapm_nc_pin(codec, "LLINEIN");

      /* always connected */
      snd_soc_dapm_enable_pin(codec, "Int Mic");
      snd_soc_dapm_enable_pin(codec, "Ext Spk");

      snd_soc_dapm_sync(codec);

      return 0;
}

static struct snd_soc_dai_link at91sam9g20ek_dai = {
      .name = "WM8731",
      .stream_name = "WM8731 PCM",
      .cpu_dai = &atmel_ssc_dai[0],
      .codec_dai = &wm8731_dai,
      .init = at91sam9g20ek_wm8731_init,
      .ops = &at91sam9g20ek_ops,
};

static struct snd_soc_card snd_soc_at91sam9g20ek = {
      .name = "AT91SAMG20-EK",
      .platform = &atmel_soc_platform,
      .dai_link = &at91sam9g20ek_dai,
      .num_links = 1,
      .set_bias_level = at91sam9g20ek_set_bias_level,
};

/*
 * FIXME: This is a temporary bodge to avoid cross-tree merge issues.
 * New drivers should register the wm8731 I2C device in the machine
 * setup code (under arch/arm for ARM systems).
 */
static int wm8731_i2c_register(void)
{
      struct i2c_board_info info;
      struct i2c_adapter *adapter;
      struct i2c_client *client;

      memset(&info, 0, sizeof(struct i2c_board_info));
      info.addr = 0x1b;
      strlcpy(info.type, "wm8731", I2C_NAME_SIZE);

      adapter = i2c_get_adapter(0);
      if (!adapter) {
            printk(KERN_ERR "can't get i2c adapter 0\n");
            return -ENODEV;
      }

      client = i2c_new_device(adapter, &info);
      i2c_put_adapter(adapter);
      if (!client) {
            printk(KERN_ERR "can't add i2c device at 0x%x\n",
                  (unsigned int)info.addr);
            return -ENODEV;
      }

      return 0;
}

static struct snd_soc_device at91sam9g20ek_snd_devdata = {
      .card = &snd_soc_at91sam9g20ek,
      .codec_dev = &soc_codec_dev_wm8731,
};

static struct platform_device *at91sam9g20ek_snd_device;

static int __init at91sam9g20ek_init(void)
{
      struct atmel_ssc_info *ssc_p = at91sam9g20ek_dai.cpu_dai->private_data;
      struct ssc_device *ssc = NULL;
      struct clk *pllb;
      int ret;

      if (!machine_is_at91sam9g20ek())
            return -ENODEV;

      /*
       * Codec MCLK is supplied by PCK0 - set it up.
       */
      mclk = clk_get(NULL, "pck0");
      if (IS_ERR(mclk)) {
            printk(KERN_ERR "ASoC: Failed to get MCLK\n");
            ret = PTR_ERR(mclk);
            goto err;
      }

      pllb = clk_get(NULL, "pllb");
      if (IS_ERR(mclk)) {
            printk(KERN_ERR "ASoC: Failed to get PLLB\n");
            ret = PTR_ERR(mclk);
            goto err_mclk;
      }
      ret = clk_set_parent(mclk, pllb);
      clk_put(pllb);
      if (ret != 0) {
            printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
            goto err_mclk;
      }

      clk_set_rate(mclk, MCLK_RATE);

      /*
       * Request SSC device
       */
      ssc = ssc_request(0);
      if (IS_ERR(ssc)) {
            printk(KERN_ERR "ASoC: Failed to request SSC 0\n");
            ret = PTR_ERR(ssc);
            ssc = NULL;
            goto err_ssc;
      }
      ssc_p->ssc = ssc;

      ret = wm8731_i2c_register();
      if (ret != 0)
            goto err_ssc;

      at91sam9g20ek_snd_device = platform_device_alloc("soc-audio", -1);
      if (!at91sam9g20ek_snd_device) {
            printk(KERN_ERR "ASoC: Platform device allocation failed\n");
            ret = -ENOMEM;
      }

      platform_set_drvdata(at91sam9g20ek_snd_device,
                  &at91sam9g20ek_snd_devdata);
      at91sam9g20ek_snd_devdata.dev = &at91sam9g20ek_snd_device->dev;

      ret = platform_device_add(at91sam9g20ek_snd_device);
      if (ret) {
            printk(KERN_ERR "ASoC: Platform device allocation failed\n");
            platform_device_put(at91sam9g20ek_snd_device);
      }

      return ret;

err_ssc:
      ssc_free(ssc);
      ssc_p->ssc = NULL;
err_mclk:
      clk_put(mclk);
      mclk = NULL;
err:
      return ret;
}

static void __exit at91sam9g20ek_exit(void)
{
      struct atmel_ssc_info *ssc_p = at91sam9g20ek_dai.cpu_dai->private_data;
      struct ssc_device *ssc;

      if (ssc_p != NULL) {
            ssc = ssc_p->ssc;
            if (ssc != NULL)
                  ssc_free(ssc);
            ssc_p->ssc = NULL;
      }

      platform_device_unregister(at91sam9g20ek_snd_device);
      at91sam9g20ek_snd_device = NULL;
      clk_put(mclk);
      mclk = NULL;
}

module_init(at91sam9g20ek_init);
module_exit(at91sam9g20ek_exit);

/* Module information */
MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
MODULE_LICENSE("GPL");

Generated by  Doxygen 1.6.0   Back to index