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

wm2000.c

/*
 * wm2000.c  --  WM2000 ALSA Soc Audio driver
 *
 * Copyright 2008-2010 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * The download image for the WM2000 will be requested as
 * 'wm2000_anc.bin' by default (overridable via platform data) at
 * runtime and is expected to be in flat binary format.  This is
 * generated by Wolfson configuration tools and includes
 * system-specific callibration information.  If supplied as a
 * sequence of ASCII-encoded hexidecimal bytes this can be converted
 * into a flat binary with a command such as this on the command line:
 *
 * perl -e 'while (<>) { s/[\r\n]+// ; printf("%c", hex($_)); }'
 *                 < file  > wm2000_anc.bin
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/firmware.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/initval.h>
#include <sound/tlv.h>

#include <sound/wm2000.h>

#include "wm2000.h"

enum wm2000_anc_mode {
      ANC_ACTIVE = 0,
      ANC_BYPASS = 1,
      ANC_STANDBY = 2,
      ANC_OFF = 3,
};

struct wm2000_priv {
      struct i2c_client *i2c;

      enum wm2000_anc_mode anc_mode;

      unsigned int anc_active:1;
      unsigned int anc_eng_ena:1;
      unsigned int spk_ena:1;

      unsigned int mclk_div:1;
      unsigned int speech_clarity:1;

      int anc_download_size;
      char *anc_download;
};

static struct i2c_client *wm2000_i2c;

static int wm2000_write(struct i2c_client *i2c, unsigned int reg,
                  unsigned int value)
{
      u8 data[3];
      int ret;

      data[0] = (reg >> 8) & 0xff;
      data[1] = reg & 0xff;
      data[2] = value & 0xff;

      dev_vdbg(&i2c->dev, "write %x = %x\n", reg, value);

      ret = i2c_master_send(i2c, data, 3);
      if (ret == 3)
            return 0;
      if (ret < 0)
            return ret;
      else
            return -EIO;
}

static unsigned int wm2000_read(struct i2c_client *i2c, unsigned int r)
{
      struct i2c_msg xfer[2];
      u8 reg[2];
      u8 data;
      int ret;

      /* Write register */
      reg[0] = (r >> 8) & 0xff;
      reg[1] = r & 0xff;
      xfer[0].addr = i2c->addr;
      xfer[0].flags = 0;
      xfer[0].len = sizeof(reg);
      xfer[0].buf = &reg[0];

      /* Read data */
      xfer[1].addr = i2c->addr;
      xfer[1].flags = I2C_M_RD;
      xfer[1].len = 1;
      xfer[1].buf = &data;

      ret = i2c_transfer(i2c->adapter, xfer, 2);
      if (ret != 2) {
            dev_err(&i2c->dev, "i2c_transfer() returned %d\n", ret);
            return 0;
      }

      dev_vdbg(&i2c->dev, "read %x from %x\n", data, r);

      return data;
}

static void wm2000_reset(struct wm2000_priv *wm2000)
{
      struct i2c_client *i2c = wm2000->i2c;

      wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_ENG_CLR);
      wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_CLR);
      wm2000_write(i2c, WM2000_REG_ID1, 0);

      wm2000->anc_mode = ANC_OFF;
}

static int wm2000_poll_bit(struct i2c_client *i2c,
                     unsigned int reg, u8 mask, int timeout)
{
      int val;

      val = wm2000_read(i2c, reg);

      while (!(val & mask) && --timeout) {
            msleep(1);
            val = wm2000_read(i2c, reg);
      }

      if (timeout == 0)
            return 0;
      else
            return 1;
}

static int wm2000_power_up(struct i2c_client *i2c, int analogue)
{
      struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
      int ret, timeout;

      BUG_ON(wm2000->anc_mode != ANC_OFF);

      dev_dbg(&i2c->dev, "Beginning power up\n");

      if (!wm2000->mclk_div) {
            dev_dbg(&i2c->dev, "Disabling MCLK divider\n");
            wm2000_write(i2c, WM2000_REG_SYS_CTL2,
                       WM2000_MCLK_DIV2_ENA_CLR);
      } else {
            dev_dbg(&i2c->dev, "Enabling MCLK divider\n");
            wm2000_write(i2c, WM2000_REG_SYS_CTL2,
                       WM2000_MCLK_DIV2_ENA_SET);
      }

      wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_ENG_CLR);
      wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_ENG_SET);

      /* Wait for ANC engine to become ready */
      if (!wm2000_poll_bit(i2c, WM2000_REG_ANC_STAT,
                       WM2000_ANC_ENG_IDLE, 1)) {
            dev_err(&i2c->dev, "ANC engine failed to reset\n");
            return -ETIMEDOUT;
      }

      if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
                       WM2000_STATUS_BOOT_COMPLETE, 1)) {
            dev_err(&i2c->dev, "ANC engine failed to initialise\n");
            return -ETIMEDOUT;
      }

      wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_SET);

      /* Open code download of the data since it is the only bulk
       * write we do. */
      dev_dbg(&i2c->dev, "Downloading %d bytes\n",
            wm2000->anc_download_size - 2);

      ret = i2c_master_send(i2c, wm2000->anc_download,
                        wm2000->anc_download_size);
      if (ret < 0) {
            dev_err(&i2c->dev, "i2c_transfer() failed: %d\n", ret);
            return ret;
      }
      if (ret != wm2000->anc_download_size) {
            dev_err(&i2c->dev, "i2c_transfer() failed, %d != %d\n",
                  ret, wm2000->anc_download_size);
            return -EIO;
      }

      dev_dbg(&i2c->dev, "Download complete\n");

      if (analogue) {
            timeout = 248;
            wm2000_write(i2c, WM2000_REG_ANA_VMID_PU_TIME, timeout / 4);

            wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
                       WM2000_MODE_ANA_SEQ_INCLUDE |
                       WM2000_MODE_MOUSE_ENABLE |
                       WM2000_MODE_THERMAL_ENABLE);
      } else {
            timeout = 10;

            wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
                       WM2000_MODE_MOUSE_ENABLE |
                       WM2000_MODE_THERMAL_ENABLE);
      }

      ret = wm2000_read(i2c, WM2000_REG_SPEECH_CLARITY);
      if (wm2000->speech_clarity)
            ret &= ~WM2000_SPEECH_CLARITY;
      else
            ret |= WM2000_SPEECH_CLARITY;
      wm2000_write(i2c, WM2000_REG_SPEECH_CLARITY, ret);

      wm2000_write(i2c, WM2000_REG_SYS_START0, 0x33);
      wm2000_write(i2c, WM2000_REG_SYS_START1, 0x02);

      wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_INT_N_CLR);

      if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
                       WM2000_STATUS_MOUSE_ACTIVE, timeout)) {
            dev_err(&i2c->dev, "Timed out waiting for device after %dms\n",
                  timeout * 10);
            return -ETIMEDOUT;
      }

      dev_dbg(&i2c->dev, "ANC active\n");
      if (analogue)
            dev_dbg(&i2c->dev, "Analogue active\n");
      wm2000->anc_mode = ANC_ACTIVE;

      return 0;
}

static int wm2000_power_down(struct i2c_client *i2c, int analogue)
{
      struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
      int timeout;

      if (analogue) {
            timeout = 248;
            wm2000_write(i2c, WM2000_REG_ANA_VMID_PD_TIME, timeout / 4);
            wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
                       WM2000_MODE_ANA_SEQ_INCLUDE |
                       WM2000_MODE_POWER_DOWN);
      } else {
            timeout = 10;
            wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
                       WM2000_MODE_POWER_DOWN);
      }

      if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
                       WM2000_STATUS_POWER_DOWN_COMPLETE, timeout)) {
            dev_err(&i2c->dev, "Timeout waiting for ANC power down\n");
            return -ETIMEDOUT;
      }

      if (!wm2000_poll_bit(i2c, WM2000_REG_ANC_STAT,
                       WM2000_ANC_ENG_IDLE, 1)) {
            dev_err(&i2c->dev, "Timeout waiting for ANC engine idle\n");
            return -ETIMEDOUT;
      }

      dev_dbg(&i2c->dev, "powered off\n");
      wm2000->anc_mode = ANC_OFF;

      return 0;
}

static int wm2000_enter_bypass(struct i2c_client *i2c, int analogue)
{
      struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);

      BUG_ON(wm2000->anc_mode != ANC_ACTIVE);

      if (analogue) {
            wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
                       WM2000_MODE_ANA_SEQ_INCLUDE |
                       WM2000_MODE_THERMAL_ENABLE |
                       WM2000_MODE_BYPASS_ENTRY);
      } else {
            wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
                       WM2000_MODE_THERMAL_ENABLE |
                       WM2000_MODE_BYPASS_ENTRY);
      }

      if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
                       WM2000_STATUS_ANC_DISABLED, 10)) {
            dev_err(&i2c->dev, "Timeout waiting for ANC disable\n");
            return -ETIMEDOUT;
      }

      if (!wm2000_poll_bit(i2c, WM2000_REG_ANC_STAT,
                       WM2000_ANC_ENG_IDLE, 1)) {
            dev_err(&i2c->dev, "Timeout waiting for ANC engine idle\n");
            return -ETIMEDOUT;
      }

      wm2000_write(i2c, WM2000_REG_SYS_CTL1, WM2000_SYS_STBY);
      wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_CLR);

      wm2000->anc_mode = ANC_BYPASS;
      dev_dbg(&i2c->dev, "bypass enabled\n");

      return 0;
}

static int wm2000_exit_bypass(struct i2c_client *i2c, int analogue)
{
      struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);

      BUG_ON(wm2000->anc_mode != ANC_BYPASS);
      
      wm2000_write(i2c, WM2000_REG_SYS_CTL1, 0);

      if (analogue) {
            wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
                       WM2000_MODE_ANA_SEQ_INCLUDE |
                       WM2000_MODE_MOUSE_ENABLE |
                       WM2000_MODE_THERMAL_ENABLE);
      } else {
            wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
                       WM2000_MODE_MOUSE_ENABLE |
                       WM2000_MODE_THERMAL_ENABLE);
      }

      wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_SET);
      wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_INT_N_CLR);

      if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
                       WM2000_STATUS_MOUSE_ACTIVE, 10)) {
            dev_err(&i2c->dev, "Timed out waiting for MOUSE\n");
            return -ETIMEDOUT;
      }

      wm2000->anc_mode = ANC_ACTIVE;
      dev_dbg(&i2c->dev, "MOUSE active\n");

      return 0;
}

static int wm2000_enter_standby(struct i2c_client *i2c, int analogue)
{
      struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
      int timeout;

      BUG_ON(wm2000->anc_mode != ANC_ACTIVE);

      if (analogue) {
            timeout = 248;
            wm2000_write(i2c, WM2000_REG_ANA_VMID_PD_TIME, timeout / 4);

            wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
                       WM2000_MODE_ANA_SEQ_INCLUDE |
                       WM2000_MODE_THERMAL_ENABLE |
                       WM2000_MODE_STANDBY_ENTRY);
      } else {
            timeout = 10;

            wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
                       WM2000_MODE_THERMAL_ENABLE |
                       WM2000_MODE_STANDBY_ENTRY);
      }

      if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
                       WM2000_STATUS_ANC_DISABLED, timeout)) {
            dev_err(&i2c->dev,
                  "Timed out waiting for ANC disable after 1ms\n");
            return -ETIMEDOUT;
      }

      if (!wm2000_poll_bit(i2c, WM2000_REG_ANC_STAT, WM2000_ANC_ENG_IDLE,
                       1)) {
            dev_err(&i2c->dev,
                  "Timed out waiting for standby after %dms\n",
                  timeout * 10);
            return -ETIMEDOUT;
      }

      wm2000_write(i2c, WM2000_REG_SYS_CTL1, WM2000_SYS_STBY);
      wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_CLR);

      wm2000->anc_mode = ANC_STANDBY;
      dev_dbg(&i2c->dev, "standby\n");
      if (analogue)
            dev_dbg(&i2c->dev, "Analogue disabled\n");

      return 0;
}

static int wm2000_exit_standby(struct i2c_client *i2c, int analogue)
{
      struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
      int timeout;

      BUG_ON(wm2000->anc_mode != ANC_STANDBY);

      wm2000_write(i2c, WM2000_REG_SYS_CTL1, 0);

      if (analogue) {
            timeout = 248;
            wm2000_write(i2c, WM2000_REG_ANA_VMID_PU_TIME, timeout / 4);

            wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
                       WM2000_MODE_ANA_SEQ_INCLUDE |
                       WM2000_MODE_THERMAL_ENABLE |
                       WM2000_MODE_MOUSE_ENABLE);
      } else {
            timeout = 10;

            wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
                       WM2000_MODE_THERMAL_ENABLE |
                       WM2000_MODE_MOUSE_ENABLE);
      }

      wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_SET);
      wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_INT_N_CLR);

      if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
                       WM2000_STATUS_MOUSE_ACTIVE, timeout)) {
            dev_err(&i2c->dev, "Timed out waiting for MOUSE after %dms\n",
                  timeout * 10);
            return -ETIMEDOUT;
      }

      wm2000->anc_mode = ANC_ACTIVE;
      dev_dbg(&i2c->dev, "MOUSE active\n");
      if (analogue)
            dev_dbg(&i2c->dev, "Analogue enabled\n");

      return 0;
}

typedef int (*wm2000_mode_fn)(struct i2c_client *i2c, int analogue);

static struct {
      enum wm2000_anc_mode source;
      enum wm2000_anc_mode dest;
      int analogue;
      wm2000_mode_fn step[2];
} anc_transitions[] = {
      {
            .source = ANC_OFF,
            .dest = ANC_ACTIVE,
            .analogue = 1,
            .step = {
                  wm2000_power_up,
            },
      },
      {
            .source = ANC_OFF,
            .dest = ANC_STANDBY,
            .step = {
                  wm2000_power_up,
                  wm2000_enter_standby,
            },
      },
      {
            .source = ANC_OFF,
            .dest = ANC_BYPASS,
            .analogue = 1,
            .step = {
                  wm2000_power_up,
                  wm2000_enter_bypass,
            },
      },
      {
            .source = ANC_ACTIVE,
            .dest = ANC_BYPASS,
            .analogue = 1,
            .step = {
                  wm2000_enter_bypass,
            },
      },
      {
            .source = ANC_ACTIVE,
            .dest = ANC_STANDBY,
            .analogue = 1,
            .step = {
                  wm2000_enter_standby,
            },
      },
      {
            .source = ANC_ACTIVE,
            .dest = ANC_OFF,
            .analogue = 1,
            .step = {
                  wm2000_power_down,
            },
      },
      {
            .source = ANC_BYPASS,
            .dest = ANC_ACTIVE,
            .analogue = 1,
            .step = {
                  wm2000_exit_bypass,
            },
      },
      {
            .source = ANC_BYPASS,
            .dest = ANC_STANDBY,
            .analogue = 1,
            .step = {
                  wm2000_exit_bypass,
                  wm2000_enter_standby,
            },
      },
      {
            .source = ANC_BYPASS,
            .dest = ANC_OFF,
            .step = {
                  wm2000_exit_bypass,
                  wm2000_power_down,
            },
      },
      {
            .source = ANC_STANDBY,
            .dest = ANC_ACTIVE,
            .analogue = 1,
            .step = {
                  wm2000_exit_standby,
            },
      },
      {
            .source = ANC_STANDBY,
            .dest = ANC_BYPASS,
            .analogue = 1,
            .step = {
                  wm2000_exit_standby,
                  wm2000_enter_bypass,
            },
      },
      {
            .source = ANC_STANDBY,
            .dest = ANC_OFF,
            .step = {
                  wm2000_exit_standby,
                  wm2000_power_down,
            },
      },
};

static int wm2000_anc_transition(struct wm2000_priv *wm2000,
                         enum wm2000_anc_mode mode)
{
      struct i2c_client *i2c = wm2000->i2c;
      int i, j;
      int ret;

      if (wm2000->anc_mode == mode)
            return 0;

      for (i = 0; i < ARRAY_SIZE(anc_transitions); i++)
            if (anc_transitions[i].source == wm2000->anc_mode &&
                anc_transitions[i].dest == mode)
                  break;
      if (i == ARRAY_SIZE(anc_transitions)) {
            dev_err(&i2c->dev, "No transition for %d->%d\n",
                  wm2000->anc_mode, mode);
            return -EINVAL;
      }

      for (j = 0; j < ARRAY_SIZE(anc_transitions[j].step); j++) {
            if (!anc_transitions[i].step[j])
                  break;
            ret = anc_transitions[i].step[j](i2c,
                                     anc_transitions[i].analogue);
            if (ret != 0)
                  return ret;
      }

      return 0;
}

static int wm2000_anc_set_mode(struct wm2000_priv *wm2000)
{
      struct i2c_client *i2c = wm2000->i2c;
      enum wm2000_anc_mode mode;

      if (wm2000->anc_eng_ena && wm2000->spk_ena)
            if (wm2000->anc_active)
                  mode = ANC_ACTIVE;
            else
                  mode = ANC_BYPASS;
      else
            mode = ANC_STANDBY;

      dev_dbg(&i2c->dev, "Set mode %d (enabled %d, mute %d, active %d)\n",
            mode, wm2000->anc_eng_ena, !wm2000->spk_ena,
            wm2000->anc_active);

      return wm2000_anc_transition(wm2000, mode);
}

static int wm2000_anc_mode_get(struct snd_kcontrol *kcontrol,
                         struct snd_ctl_elem_value *ucontrol)
{
      struct wm2000_priv *wm2000 = dev_get_drvdata(&wm2000_i2c->dev);

      ucontrol->value.enumerated.item[0] = wm2000->anc_active;

      return 0;
}

static int wm2000_anc_mode_put(struct snd_kcontrol *kcontrol,
                         struct snd_ctl_elem_value *ucontrol)
{
      struct wm2000_priv *wm2000 = dev_get_drvdata(&wm2000_i2c->dev);
      int anc_active = ucontrol->value.enumerated.item[0];

      if (anc_active > 1)
            return -EINVAL;

      wm2000->anc_active = anc_active;

      return wm2000_anc_set_mode(wm2000);
}

static int wm2000_speaker_get(struct snd_kcontrol *kcontrol,
                        struct snd_ctl_elem_value *ucontrol)
{
      struct wm2000_priv *wm2000 = dev_get_drvdata(&wm2000_i2c->dev);

      ucontrol->value.enumerated.item[0] = wm2000->spk_ena;

      return 0;
}

static int wm2000_speaker_put(struct snd_kcontrol *kcontrol,
                        struct snd_ctl_elem_value *ucontrol)
{
      struct wm2000_priv *wm2000 = dev_get_drvdata(&wm2000_i2c->dev);
      int val = ucontrol->value.enumerated.item[0];

      if (val > 1)
            return -EINVAL;

      wm2000->spk_ena = val;

      return wm2000_anc_set_mode(wm2000);
}

static const struct snd_kcontrol_new wm2000_controls[] = {
      SOC_SINGLE_BOOL_EXT("WM2000 ANC Switch", 0,
                      wm2000_anc_mode_get,
                      wm2000_anc_mode_put),
      SOC_SINGLE_BOOL_EXT("WM2000 Switch", 0,
                      wm2000_speaker_get,
                      wm2000_speaker_put),
};

static int wm2000_anc_power_event(struct snd_soc_dapm_widget *w,
                          struct snd_kcontrol *kcontrol, int event)
{
      struct wm2000_priv *wm2000 = dev_get_drvdata(&wm2000_i2c->dev);

      if (SND_SOC_DAPM_EVENT_ON(event))
            wm2000->anc_eng_ena = 1;

      if (SND_SOC_DAPM_EVENT_OFF(event))
            wm2000->anc_eng_ena = 0;

      return wm2000_anc_set_mode(wm2000);
}

static const struct snd_soc_dapm_widget wm2000_dapm_widgets[] = {
/* Externally visible pins */
SND_SOC_DAPM_OUTPUT("WM2000 SPKN"),
SND_SOC_DAPM_OUTPUT("WM2000 SPKP"),

SND_SOC_DAPM_INPUT("WM2000 LINN"),
SND_SOC_DAPM_INPUT("WM2000 LINP"),

SND_SOC_DAPM_PGA_E("ANC Engine", SND_SOC_NOPM, 0, 0, NULL, 0,
               wm2000_anc_power_event,
               SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
};

/* Target, Path, Source */
static const struct snd_soc_dapm_route audio_map[] = {
      { "WM2000 SPKN", NULL, "ANC Engine" },
      { "WM2000 SPKP", NULL, "ANC Engine" },
      { "ANC Engine", NULL, "WM2000 LINN" },
      { "ANC Engine", NULL, "WM2000 LINP" },
};

/* Called from the machine driver */
int wm2000_add_controls(struct snd_soc_codec *codec)
{
      int ret;

      if (!wm2000_i2c) {
            pr_err("WM2000 not yet probed\n");
            return -ENODEV;
      }

      ret = snd_soc_dapm_new_controls(codec, wm2000_dapm_widgets,
                              ARRAY_SIZE(wm2000_dapm_widgets));
      if (ret < 0)
            return ret;

      ret = snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
      if (ret < 0)
            return ret;

      return snd_soc_add_controls(codec, wm2000_controls,
                  ARRAY_SIZE(wm2000_controls));
}
EXPORT_SYMBOL_GPL(wm2000_add_controls);

static int __devinit wm2000_i2c_probe(struct i2c_client *i2c,
                              const struct i2c_device_id *i2c_id)
{
      struct wm2000_priv *wm2000;
      struct wm2000_platform_data *pdata;
      const char *filename;
      const struct firmware *fw;
      int reg, ret;
      u16 id;

      if (wm2000_i2c) {
            dev_err(&i2c->dev, "Another WM2000 is already registered\n");
            return -EINVAL;
      }

      wm2000 = kzalloc(sizeof(struct wm2000_priv), GFP_KERNEL);
      if (wm2000 == NULL) {
            dev_err(&i2c->dev, "Unable to allocate private data\n");
            return -ENOMEM;
      }

      /* Verify that this is a WM2000 */
      reg = wm2000_read(i2c, WM2000_REG_ID1);
      id = reg << 8;
      reg = wm2000_read(i2c, WM2000_REG_ID2);
      id |= reg & 0xff;

      if (id != 0x2000) {
            dev_err(&i2c->dev, "Device is not a WM2000 - ID %x\n", id);
            ret = -ENODEV;
            goto err;
      }

      reg = wm2000_read(i2c, WM2000_REG_REVISON);
      dev_info(&i2c->dev, "revision %c\n", reg + 'A');

      filename = "wm2000_anc.bin";
      pdata = dev_get_platdata(&i2c->dev);
      if (pdata) {
            wm2000->mclk_div = pdata->mclkdiv2;
            wm2000->speech_clarity = !pdata->speech_enh_disable;

            if (pdata->download_file)
                  filename = pdata->download_file;
      }

      ret = request_firmware(&fw, filename, &i2c->dev);
      if (ret != 0) {
            dev_err(&i2c->dev, "Failed to acquire ANC data: %d\n", ret);
            goto err;
      }

      /* Pre-cook the concatenation of the register address onto the image */
      wm2000->anc_download_size = fw->size + 2;
      wm2000->anc_download = kmalloc(wm2000->anc_download_size, GFP_KERNEL);
      if (wm2000->anc_download == NULL) {
            dev_err(&i2c->dev, "Out of memory\n");
            ret = -ENOMEM;
            goto err_fw;
      }

      wm2000->anc_download[0] = 0x80;
      wm2000->anc_download[1] = 0x00;
      memcpy(wm2000->anc_download + 2, fw->data, fw->size);

      release_firmware(fw);

      dev_set_drvdata(&i2c->dev, wm2000);
      wm2000->anc_eng_ena = 1;
      wm2000->i2c = i2c;

      wm2000_reset(wm2000);

      /* This will trigger a transition to standby mode by default */
      wm2000_anc_set_mode(wm2000);  

      wm2000_i2c = i2c;

      return 0;

err_fw:
      release_firmware(fw);
err:
      kfree(wm2000);
      return ret;
}

static __devexit int wm2000_i2c_remove(struct i2c_client *i2c)
{
      struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);

      wm2000_anc_transition(wm2000, ANC_OFF);

      wm2000_i2c = NULL;
      kfree(wm2000->anc_download);
      kfree(wm2000);

      return 0;
}

static void wm2000_i2c_shutdown(struct i2c_client *i2c)
{
      struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);

      wm2000_anc_transition(wm2000, ANC_OFF);
}

#ifdef CONFIG_PM
static int wm2000_i2c_suspend(struct i2c_client *i2c, pm_message_t mesg)
{
      struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);

      return wm2000_anc_transition(wm2000, ANC_OFF);
}

static int wm2000_i2c_resume(struct i2c_client *i2c)
{
      struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);

      return wm2000_anc_set_mode(wm2000);
}
#else
#define wm2000_i2c_suspend NULL
#define wm2000_i2c_resume NULL
#endif

static const struct i2c_device_id wm2000_i2c_id[] = {
      { "wm2000", 0 },
      { }
};
MODULE_DEVICE_TABLE(i2c, wm2000_i2c_id);

static struct i2c_driver wm2000_i2c_driver = {
      .driver = {
            .name = "wm2000",
            .owner = THIS_MODULE,
      },
      .probe = wm2000_i2c_probe,
      .remove = __devexit_p(wm2000_i2c_remove),
      .suspend = wm2000_i2c_suspend,
      .resume = wm2000_i2c_resume,
      .shutdown = wm2000_i2c_shutdown,
      .id_table = wm2000_i2c_id,
};

static int __init wm2000_init(void)
{
      return i2c_add_driver(&wm2000_i2c_driver);
}
module_init(wm2000_init);

static void __exit wm2000_exit(void)
{
      i2c_del_driver(&wm2000_i2c_driver);
}
module_exit(wm2000_exit);

MODULE_DESCRIPTION("ASoC WM2000 driver");
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfonmicro.com>");
MODULE_LICENSE("GPL");

Generated by  Doxygen 1.6.0   Back to index