drivers/regulator/wm8400-regulator.c - kernel/msm - Gitiles

 /*
  * Regulator support for WM8400
  *
  * Copyright 2008 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 as
  * published by the Free Software Foundation; either version 2 of the
  * License, or (at your option) any later version.
  *
  */

 #include <linux/bug.h>
 #include <linux/err.h>
 #include <linux/kernel.h>
 #include <linux/regulator/driver.h>
 #include <linux/mfd/wm8400-private.h>

 static int wm8400_ldo_is_enabled(struct regulator_dev *dev)
 {
 	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 	u16 val;

 	val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev));
 	return (val & WM8400_LDO1_ENA) != 0;
 }

 static int wm8400_ldo_enable(struct regulator_dev *dev)
 {
 	struct wm8400 *wm8400 = rdev_get_drvdata(dev);

 	return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
 			       WM8400_LDO1_ENA, WM8400_LDO1_ENA);
 }

 static int wm8400_ldo_disable(struct regulator_dev *dev)
 {
 	struct wm8400 *wm8400 = rdev_get_drvdata(dev);

 	return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
 			       WM8400_LDO1_ENA, 0);
 }

 static int wm8400_ldo_get_voltage(struct regulator_dev *dev)
 {
 	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 	u16 val;

 	val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev));
 	val &= WM8400_LDO1_VSEL_MASK;

 	if (val < 15)
 		return 900000 + (val * 50000);
 	else
 		return 1600000 + ((val - 14) * 100000);
 }

 static int wm8400_ldo_set_voltage(struct regulator_dev *dev,
 				  int min_uV, int max_uV)
 {
 	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 	u16 val;

 	if (min_uV < 900000 || min_uV > 3300000)
 		return -EINVAL;

 	if (min_uV < 1700000) {
 		/* Steps of 50mV from 900mV;  */
 		val = (min_uV - 850001) / 50000;

 		if ((val * 50000) + 900000 > max_uV)
 			return -EINVAL;
 		BUG_ON((val * 50000) + 900000 < min_uV);
 	} else {
 		/* Steps of 100mV from 1700mV */
 		val = ((min_uV - 1600001) / 100000);

 		if ((val * 100000) + 1700000 > max_uV)
 			return -EINVAL;
 		BUG_ON((val * 100000) + 1700000 < min_uV);

 		val += 0xf;
 	}

 	return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
 			       WM8400_LDO1_VSEL_MASK, val);
 }

 static struct regulator_ops wm8400_ldo_ops = {
 	.is_enabled = wm8400_ldo_is_enabled,
 	.enable = wm8400_ldo_enable,
 	.disable = wm8400_ldo_disable,
 	.get_voltage = wm8400_ldo_get_voltage,
 	.set_voltage = wm8400_ldo_set_voltage,
 };

 static int wm8400_dcdc_is_enabled(struct regulator_dev *dev)
 {
 	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 	u16 val;

 	val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
 	return (val & WM8400_DC1_ENA) != 0;
 }

 static int wm8400_dcdc_enable(struct regulator_dev *dev)
 {
 	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;

 	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 			       WM8400_DC1_ENA, WM8400_DC1_ENA);
 }

 static int wm8400_dcdc_disable(struct regulator_dev *dev)
 {
 	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;

 	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 			       WM8400_DC1_ENA, 0);
 }

 static int wm8400_dcdc_get_voltage(struct regulator_dev *dev)
 {
 	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 	u16 val;
 	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;

 	val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
 	val &= WM8400_DC1_VSEL_MASK;

 	return 850000 + (25000 * val);
 }

 static int wm8400_dcdc_set_voltage(struct regulator_dev *dev,
 				  int min_uV, int max_uV)
 {
 	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 	u16 val;
 	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;

 	if (min_uV < 850000)
 		return -EINVAL;

 	val = (min_uV - 825001) / 25000;

 	if (850000 + (25000 * val) > max_uV)
 		return -EINVAL;
 	BUG_ON(850000 + (25000 * val) < min_uV);

 	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 			       WM8400_DC1_VSEL_MASK, val);
 }

 static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
 {
 	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 	u16 data[2];
 	int ret;

 	ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2,
 				data);
 	if (ret != 0)
 		return 0;

 	/* Datasheet: hibernate */
 	if (data[0] & WM8400_DC1_SLEEP)
 		return REGULATOR_MODE_STANDBY;

 	/* Datasheet: standby */
 	if (!(data[0] & WM8400_DC1_ACTIVE))
 		return REGULATOR_MODE_IDLE;

 	/* Datasheet: active with or without force PWM */
 	if (data[1] & WM8400_DC1_FRC_PWM)
 		return REGULATOR_MODE_FAST;
 	else
 		return REGULATOR_MODE_NORMAL;
 }

 static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
 {
 	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 	int ret;

 	switch (mode) {
 	case REGULATOR_MODE_FAST:
 		/* Datasheet: active with force PWM */
 		ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
 				      WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
 		if (ret != 0)
 			return ret;

 		return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 				       WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
 				       WM8400_DC1_ACTIVE);

 	case REGULATOR_MODE_NORMAL:
 		/* Datasheet: active */
 		ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
 				      WM8400_DC1_FRC_PWM, 0);
 		if (ret != 0)
 			return ret;

 		return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 				       WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
 				       WM8400_DC1_ACTIVE);

 	case REGULATOR_MODE_IDLE:
 		/* Datasheet: standby */
 		ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 				      WM8400_DC1_ACTIVE, 0);
 		if (ret != 0)
 			return ret;
 		return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 				       WM8400_DC1_SLEEP, 0);

 	default:
 		return -EINVAL;
 	}
 }

 static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
 						 int input_uV, int output_uV,
 						 int load_uA)
 {
 	return REGULATOR_MODE_NORMAL;
 }

 static struct regulator_ops wm8400_dcdc_ops = {
 	.is_enabled = wm8400_dcdc_is_enabled,
 	.enable = wm8400_dcdc_enable,
 	.disable = wm8400_dcdc_disable,
 	.get_voltage = wm8400_dcdc_get_voltage,
 	.set_voltage = wm8400_dcdc_set_voltage,
 	.get_mode = wm8400_dcdc_get_mode,
 	.set_mode = wm8400_dcdc_set_mode,
 	.get_optimum_mode = wm8400_dcdc_get_optimum_mode,
 };

 static struct regulator_desc regulators[] = {
 	{
 		.name = "LDO1",
 		.id = WM8400_LDO1,
 		.ops = &wm8400_ldo_ops,
 		.type = REGULATOR_VOLTAGE,
 		.owner = THIS_MODULE,
 	},
 	{
 		.name = "LDO2",
 		.id = WM8400_LDO2,
 		.ops = &wm8400_ldo_ops,
 		.type = REGULATOR_VOLTAGE,
 		.owner = THIS_MODULE,
 	},
 	{
 		.name = "LDO3",
 		.id = WM8400_LDO3,
 		.ops = &wm8400_ldo_ops,
 		.type = REGULATOR_VOLTAGE,
 		.owner = THIS_MODULE,
 	},
 	{
 		.name = "LDO4",
 		.id = WM8400_LDO4,
 		.ops = &wm8400_ldo_ops,
 		.type = REGULATOR_VOLTAGE,
 		.owner = THIS_MODULE,
 	},
 	{
 		.name = "DCDC1",
 		.id = WM8400_DCDC1,
 		.ops = &wm8400_dcdc_ops,
 		.type = REGULATOR_VOLTAGE,
 		.owner = THIS_MODULE,
 	},
 	{
 		.name = "DCDC2",
 		.id = WM8400_DCDC2,
 		.ops = &wm8400_dcdc_ops,
 		.type = REGULATOR_VOLTAGE,
 		.owner = THIS_MODULE,
 	},
 };

 static int __devinit wm8400_regulator_probe(struct platform_device *pdev)
 {
 	struct regulator_dev *rdev;

 	rdev = regulator_register(&regulators[pdev->id], &pdev->dev,
 		pdev->dev.driver_data);

 	if (IS_ERR(rdev))
 		return PTR_ERR(rdev);

 	return 0;
 }

 static int __devexit wm8400_regulator_remove(struct platform_device *pdev)
 {
 	struct regulator_dev *rdev = platform_get_drvdata(pdev);

 	regulator_unregister(rdev);

 	return 0;
 }

 static struct platform_driver wm8400_regulator_driver = {
 	.driver = {
 		.name = "wm8400-regulator",
 	},
 	.probe = wm8400_regulator_probe,
 	.remove = __devexit_p(wm8400_regulator_remove),
 };

 /**
  * wm8400_register_regulator - enable software control of a WM8400 regulator
  *
  * This function enables software control of a WM8400 regulator via
  * the regulator API.  It is intended to be called from the
  * platform_init() callback of the WM8400 MFD driver.
  *
  * @param dev      The WM8400 device to operate on.
  * @param reg      The regulator to control.
  * @param initdata Regulator initdata for the regulator.
  */
 int wm8400_register_regulator(struct device *dev, int reg,
 			      struct regulator_init_data *initdata)
 {
 	struct wm8400 *wm8400 = dev->driver_data;

 	if (wm8400->regulators[reg].name)
 		return -EBUSY;

 	initdata->driver_data = wm8400;

 	wm8400->regulators[reg].name = "wm8400-regulator";
 	wm8400->regulators[reg].id = reg;
 	wm8400->regulators[reg].dev.parent = dev;
 	wm8400->regulators[reg].dev.driver_data = wm8400;
 	wm8400->regulators[reg].dev.platform_data = initdata;

 	return platform_device_register(&wm8400->regulators[reg]);
 }
 EXPORT_SYMBOL_GPL(wm8400_register_regulator);

 static int __init wm8400_regulator_init(void)
 {
 	return platform_driver_register(&wm8400_regulator_driver);
 }
 module_init(wm8400_regulator_init);

 static void __exit wm8400_regulator_exit(void)
 {
 	platform_driver_unregister(&wm8400_regulator_driver);
 }
 module_exit(wm8400_regulator_exit);

 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 MODULE_DESCRIPTION("WM8400 regulator driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:wm8400-regulator");
	/*
	* Regulator support for WM8400
	*
	* Copyright 2008 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 as
	* published by the Free Software Foundation; either version 2 of the
	* License, or (at your option) any later version.
	*
	*/

	#include <linux/bug.h>
	#include <linux/err.h>
	#include <linux/kernel.h>
	#include <linux/regulator/driver.h>
	#include <linux/mfd/wm8400-private.h>

	static int wm8400_ldo_is_enabled(struct regulator_dev *dev)
	{
	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	u16 val;

	val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev));
	return (val & WM8400_LDO1_ENA) != 0;
	}

	static int wm8400_ldo_enable(struct regulator_dev *dev)
	{
	struct wm8400 *wm8400 = rdev_get_drvdata(dev);

	return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
	WM8400_LDO1_ENA, WM8400_LDO1_ENA);
	}

	static int wm8400_ldo_disable(struct regulator_dev *dev)
	{
	struct wm8400 *wm8400 = rdev_get_drvdata(dev);

	return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
	WM8400_LDO1_ENA, 0);
	}

	static int wm8400_ldo_get_voltage(struct regulator_dev *dev)
	{
	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	u16 val;

	val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev));
	val &= WM8400_LDO1_VSEL_MASK;

	if (val < 15)
	return 900000 + (val * 50000);
	else
	return 1600000 + ((val - 14) * 100000);
	}

	static int wm8400_ldo_set_voltage(struct regulator_dev *dev,
	int min_uV, int max_uV)
	{
	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	u16 val;

	if (min_uV < 900000 \|\| min_uV > 3300000)
	return -EINVAL;

	if (min_uV < 1700000) {
	/* Steps of 50mV from 900mV; */
	val = (min_uV - 850001) / 50000;

	if ((val * 50000) + 900000 > max_uV)
	return -EINVAL;
	BUG_ON((val * 50000) + 900000 < min_uV);
	} else {
	/* Steps of 100mV from 1700mV */
	val = ((min_uV - 1600001) / 100000);

	if ((val * 100000) + 1700000 > max_uV)
	return -EINVAL;
	BUG_ON((val * 100000) + 1700000 < min_uV);

	val += 0xf;
	}

	return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
	WM8400_LDO1_VSEL_MASK, val);
	}

	static struct regulator_ops wm8400_ldo_ops = {
	.is_enabled = wm8400_ldo_is_enabled,
	.enable = wm8400_ldo_enable,
	.disable = wm8400_ldo_disable,
	.get_voltage = wm8400_ldo_get_voltage,
	.set_voltage = wm8400_ldo_set_voltage,
	};

	static int wm8400_dcdc_is_enabled(struct regulator_dev *dev)
	{
	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
	u16 val;

	val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
	return (val & WM8400_DC1_ENA) != 0;
	}

	static int wm8400_dcdc_enable(struct regulator_dev *dev)
	{
	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;

	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
	WM8400_DC1_ENA, WM8400_DC1_ENA);
	}

	static int wm8400_dcdc_disable(struct regulator_dev *dev)
	{
	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;

	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
	WM8400_DC1_ENA, 0);
	}

	static int wm8400_dcdc_get_voltage(struct regulator_dev *dev)
	{
	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	u16 val;
	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;

	val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
	val &= WM8400_DC1_VSEL_MASK;

	return 850000 + (25000 * val);
	}

	static int wm8400_dcdc_set_voltage(struct regulator_dev *dev,
	int min_uV, int max_uV)
	{
	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	u16 val;
	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;

	if (min_uV < 850000)
	return -EINVAL;

	val = (min_uV - 825001) / 25000;

	if (850000 + (25000 * val) > max_uV)
	return -EINVAL;
	BUG_ON(850000 + (25000 * val) < min_uV);

	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
	WM8400_DC1_VSEL_MASK, val);
	}

	static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
	{
	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
	u16 data[2];
	int ret;

	ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2,
	data);
	if (ret != 0)
	return 0;

	/* Datasheet: hibernate */
	if (data[0] & WM8400_DC1_SLEEP)
	return REGULATOR_MODE_STANDBY;

	/* Datasheet: standby */
	if (!(data[0] & WM8400_DC1_ACTIVE))
	return REGULATOR_MODE_IDLE;

	/* Datasheet: active with or without force PWM */
	if (data[1] & WM8400_DC1_FRC_PWM)
	return REGULATOR_MODE_FAST;
	else
	return REGULATOR_MODE_NORMAL;
	}

	static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
	{
	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
	int ret;

	switch (mode) {
	case REGULATOR_MODE_FAST:
	/* Datasheet: active with force PWM */
	ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
	WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
	if (ret != 0)
	return ret;

	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
	WM8400_DC1_ACTIVE \| WM8400_DC1_SLEEP,
	WM8400_DC1_ACTIVE);

	case REGULATOR_MODE_NORMAL:
	/* Datasheet: active */
	ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
	WM8400_DC1_FRC_PWM, 0);
	if (ret != 0)
	return ret;

	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
	WM8400_DC1_ACTIVE \| WM8400_DC1_SLEEP,
	WM8400_DC1_ACTIVE);

	case REGULATOR_MODE_IDLE:
	/* Datasheet: standby */
	ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
	WM8400_DC1_ACTIVE, 0);
	if (ret != 0)
	return ret;
	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
	WM8400_DC1_SLEEP, 0);

	default:
	return -EINVAL;
	}
	}

	static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
	int input_uV, int output_uV,
	int load_uA)
	{
	return REGULATOR_MODE_NORMAL;
	}

	static struct regulator_ops wm8400_dcdc_ops = {
	.is_enabled = wm8400_dcdc_is_enabled,
	.enable = wm8400_dcdc_enable,
	.disable = wm8400_dcdc_disable,
	.get_voltage = wm8400_dcdc_get_voltage,
	.set_voltage = wm8400_dcdc_set_voltage,
	.get_mode = wm8400_dcdc_get_mode,
	.set_mode = wm8400_dcdc_set_mode,
	.get_optimum_mode = wm8400_dcdc_get_optimum_mode,
	};

	static struct regulator_desc regulators[] = {
	{
	.name = "LDO1",
	.id = WM8400_LDO1,
	.ops = &wm8400_ldo_ops,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
	},
	{
	.name = "LDO2",
	.id = WM8400_LDO2,
	.ops = &wm8400_ldo_ops,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
	},
	{
	.name = "LDO3",
	.id = WM8400_LDO3,
	.ops = &wm8400_ldo_ops,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
	},
	{
	.name = "LDO4",
	.id = WM8400_LDO4,
	.ops = &wm8400_ldo_ops,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
	},
	{
	.name = "DCDC1",
	.id = WM8400_DCDC1,
	.ops = &wm8400_dcdc_ops,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
	},
	{
	.name = "DCDC2",
	.id = WM8400_DCDC2,
	.ops = &wm8400_dcdc_ops,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
	},
	};

	static int __devinit wm8400_regulator_probe(struct platform_device *pdev)
	{
	struct regulator_dev *rdev;

	rdev = regulator_register(&regulators[pdev->id], &pdev->dev,
	pdev->dev.driver_data);

	if (IS_ERR(rdev))
	return PTR_ERR(rdev);

	return 0;
	}

	static int __devexit wm8400_regulator_remove(struct platform_device *pdev)
	{
	struct regulator_dev *rdev = platform_get_drvdata(pdev);

	regulator_unregister(rdev);

	return 0;
	}

	static struct platform_driver wm8400_regulator_driver = {
	.driver = {
	.name = "wm8400-regulator",
	},
	.probe = wm8400_regulator_probe,
	.remove = __devexit_p(wm8400_regulator_remove),
	};

	/**
	* wm8400_register_regulator - enable software control of a WM8400 regulator
	*
	* This function enables software control of a WM8400 regulator via
	* the regulator API. It is intended to be called from the
	* platform_init() callback of the WM8400 MFD driver.
	*
	* @param dev The WM8400 device to operate on.
	* @param reg The regulator to control.
	* @param initdata Regulator initdata for the regulator.
	*/
	int wm8400_register_regulator(struct device *dev, int reg,
	struct regulator_init_data *initdata)
	{
	struct wm8400 *wm8400 = dev->driver_data;

	if (wm8400->regulators[reg].name)
	return -EBUSY;

	initdata->driver_data = wm8400;

	wm8400->regulators[reg].name = "wm8400-regulator";
	wm8400->regulators[reg].id = reg;
	wm8400->regulators[reg].dev.parent = dev;
	wm8400->regulators[reg].dev.driver_data = wm8400;
	wm8400->regulators[reg].dev.platform_data = initdata;

	return platform_device_register(&wm8400->regulators[reg]);
	}
	EXPORT_SYMBOL_GPL(wm8400_register_regulator);

	static int __init wm8400_regulator_init(void)
	{
	return platform_driver_register(&wm8400_regulator_driver);
	}
	module_init(wm8400_regulator_init);

	static void __exit wm8400_regulator_exit(void)
	{
	platform_driver_unregister(&wm8400_regulator_driver);
	}
	module_exit(wm8400_regulator_exit);

	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	MODULE_DESCRIPTION("WM8400 regulator driver");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:wm8400-regulator");