sound/soc/codecs/wm2000.c - maze/linux - Git at Google

 /*
  * 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/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");
	/*
	* 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/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");