/*
   * wm831x-ldo.c  --  LDO driver for the WM831x series
   *
   * Copyright 2009 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/module.h>
  #include <linux/moduleparam.h>
  #include <linux/init.h>
  #include <linux/bitops.h>
  #include <linux/err.h>
  #include <linux/i2c.h>
  #include <linux/platform_device.h>
  #include <linux/regulator/driver.h>

  #include <linux/slab.h>

  
  #include <linux/mfd/wm831x/core.h>
  #include <linux/mfd/wm831x/regulator.h>
  #include <linux/mfd/wm831x/pdata.h>
  
  #define WM831X_LDO_MAX_NAME 6
  
  #define WM831X_LDO_CONTROL       0
  #define WM831X_LDO_ON_CONTROL    1
  #define WM831X_LDO_SLEEP_CONTROL 2
  
  #define WM831X_ALIVE_LDO_ON_CONTROL    0
  #define WM831X_ALIVE_LDO_SLEEP_CONTROL 1
  
  struct wm831x_ldo {
  	char name[WM831X_LDO_MAX_NAME];
  	struct regulator_desc desc;
  	int base;
  	struct wm831x *wm831x;
  	struct regulator_dev *regulator;
  };
  
  /*
   * Shared
   */
  
  static int wm831x_ldo_is_enabled(struct regulator_dev *rdev)
  {
  	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  	struct wm831x *wm831x = ldo->wm831x;
  	int mask = 1 << rdev_get_id(rdev);
  	int reg;
  
  	reg = wm831x_reg_read(wm831x, WM831X_LDO_ENABLE);
  	if (reg < 0)
  		return reg;
  
  	if (reg & mask)
  		return 1;
  	else
  		return 0;
  }
  
  static int wm831x_ldo_enable(struct regulator_dev *rdev)
  {
  	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  	struct wm831x *wm831x = ldo->wm831x;
  	int mask = 1 << rdev_get_id(rdev);
  
  	return wm831x_set_bits(wm831x, WM831X_LDO_ENABLE, mask, mask);
  }
  
  static int wm831x_ldo_disable(struct regulator_dev *rdev)
  {
  	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  	struct wm831x *wm831x = ldo->wm831x;
  	int mask = 1 << rdev_get_id(rdev);
  
  	return wm831x_set_bits(wm831x, WM831X_LDO_ENABLE, mask, 0);
  }
  
  static irqreturn_t wm831x_ldo_uv_irq(int irq, void *data)
  {
  	struct wm831x_ldo *ldo = data;
  
  	regulator_notifier_call_chain(ldo->regulator,
  				      REGULATOR_EVENT_UNDER_VOLTAGE,
  				      NULL);
  
  	return IRQ_HANDLED;
  }
  
  /*
   * General purpose LDOs
   */
  
  #define WM831X_GP_LDO_SELECTOR_LOW 0xe
  #define WM831X_GP_LDO_MAX_SELECTOR 0x1f
  
  static int wm831x_gp_ldo_list_voltage(struct regulator_dev *rdev,
  				      unsigned int selector)
  {
  	/* 0.9-1.6V in 50mV steps */
  	if (selector <= WM831X_GP_LDO_SELECTOR_LOW)
  		return 900000 + (selector * 50000);
  	/* 1.7-3.3V in 50mV steps */
  	if (selector <= WM831X_GP_LDO_MAX_SELECTOR)
  		return 1600000 + ((selector - WM831X_GP_LDO_SELECTOR_LOW)
  				  * 100000);
  	return -EINVAL;
  }
  
  static int wm831x_gp_ldo_set_voltage_int(struct regulator_dev *rdev, int reg,

  					 int min_uV, int max_uV,
  					 unsigned *selector)

  {
  	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  	struct wm831x *wm831x = ldo->wm831x;
  	int vsel, ret;
  
  	if (min_uV < 900000)
  		vsel = 0;
  	else if (min_uV < 1700000)
  		vsel = ((min_uV - 900000) / 50000);
  	else
  		vsel = ((min_uV - 1700000) / 100000)
  			+ WM831X_GP_LDO_SELECTOR_LOW + 1;
  
  	ret = wm831x_gp_ldo_list_voltage(rdev, vsel);
  	if (ret < 0)
  		return ret;
  	if (ret < min_uV || ret > max_uV)
  		return -EINVAL;

  	*selector = vsel;

  	return wm831x_set_bits(wm831x, reg, WM831X_LDO1_ON_VSEL_MASK, vsel);
  }
  
  static int wm831x_gp_ldo_set_voltage(struct regulator_dev *rdev,

  				     int min_uV, int max_uV,
  				     unsigned *selector)

  {
  	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  	int reg = ldo->base + WM831X_LDO_ON_CONTROL;

  	return wm831x_gp_ldo_set_voltage_int(rdev, reg, min_uV, max_uV,
  					     selector);

  }
  
  static int wm831x_gp_ldo_set_suspend_voltage(struct regulator_dev *rdev,
  					     int uV)
  {
  	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  	int reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;

  	unsigned int selector;

  	return wm831x_gp_ldo_set_voltage_int(rdev, reg, uV, uV, &selector);

  }

  static int wm831x_gp_ldo_get_voltage_sel(struct regulator_dev *rdev)

  {
  	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  	struct wm831x *wm831x = ldo->wm831x;
  	int reg = ldo->base + WM831X_LDO_ON_CONTROL;
  	int ret;
  
  	ret = wm831x_reg_read(wm831x, reg);
  	if (ret < 0)
  		return ret;
  
  	ret &= WM831X_LDO1_ON_VSEL_MASK;

  	return ret;

  }
  
  static unsigned int wm831x_gp_ldo_get_mode(struct regulator_dev *rdev)
  {
  	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  	struct wm831x *wm831x = ldo->wm831x;
  	int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
  	int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;

  	int ret;

  
  	ret = wm831x_reg_read(wm831x, on_reg);
  	if (ret < 0)

  		return ret;

  
  	if (!(ret & WM831X_LDO1_ON_MODE))
  		return REGULATOR_MODE_NORMAL;
  
  	ret = wm831x_reg_read(wm831x, ctrl_reg);
  	if (ret < 0)

  		return ret;

  
  	if (ret & WM831X_LDO1_LP_MODE)
  		return REGULATOR_MODE_STANDBY;
  	else
  		return REGULATOR_MODE_IDLE;
  }
  
  static int wm831x_gp_ldo_set_mode(struct regulator_dev *rdev,
  				  unsigned int mode)
  {
  	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  	struct wm831x *wm831x = ldo->wm831x;
  	int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
  	int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
  	int ret;
  
  
  	switch (mode) {
  	case REGULATOR_MODE_NORMAL:
  		ret = wm831x_set_bits(wm831x, on_reg,
  				      WM831X_LDO1_ON_MODE, 0);
  		if (ret < 0)
  			return ret;
  		break;
  
  	case REGULATOR_MODE_IDLE:
  		ret = wm831x_set_bits(wm831x, ctrl_reg,

  				      WM831X_LDO1_LP_MODE, 0);

  		if (ret < 0)
  			return ret;
  
  		ret = wm831x_set_bits(wm831x, on_reg,
  				      WM831X_LDO1_ON_MODE,
  				      WM831X_LDO1_ON_MODE);
  		if (ret < 0)
  			return ret;

  		break;

  
  	case REGULATOR_MODE_STANDBY:
  		ret = wm831x_set_bits(wm831x, ctrl_reg,

  				      WM831X_LDO1_LP_MODE,
  				      WM831X_LDO1_LP_MODE);

  		if (ret < 0)
  			return ret;
  
  		ret = wm831x_set_bits(wm831x, on_reg,
  				      WM831X_LDO1_ON_MODE,
  				      WM831X_LDO1_ON_MODE);
  		if (ret < 0)
  			return ret;
  		break;
  
  	default:
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  static int wm831x_gp_ldo_get_status(struct regulator_dev *rdev)
  {
  	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  	struct wm831x *wm831x = ldo->wm831x;
  	int mask = 1 << rdev_get_id(rdev);
  	int ret;
  
  	/* Is the regulator on? */
  	ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
  	if (ret < 0)
  		return ret;
  	if (!(ret & mask))
  		return REGULATOR_STATUS_OFF;
  
  	/* Is it reporting under voltage? */
  	ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
  	if (ret & mask)
  		return REGULATOR_STATUS_ERROR;
  
  	ret = wm831x_gp_ldo_get_mode(rdev);
  	if (ret < 0)
  		return ret;
  	else
  		return regulator_mode_to_status(ret);
  }
  
  static unsigned int wm831x_gp_ldo_get_optimum_mode(struct regulator_dev *rdev,
  						   int input_uV,
  						   int output_uV, int load_uA)
  {
  	if (load_uA < 20000)
  		return REGULATOR_MODE_STANDBY;
  	if (load_uA < 50000)
  		return REGULATOR_MODE_IDLE;
  	return REGULATOR_MODE_NORMAL;
  }
  
  
  static struct regulator_ops wm831x_gp_ldo_ops = {
  	.list_voltage = wm831x_gp_ldo_list_voltage,

  	.get_voltage_sel = wm831x_gp_ldo_get_voltage_sel,

  	.set_voltage = wm831x_gp_ldo_set_voltage,
  	.set_suspend_voltage = wm831x_gp_ldo_set_suspend_voltage,
  	.get_mode = wm831x_gp_ldo_get_mode,
  	.set_mode = wm831x_gp_ldo_set_mode,
  	.get_status = wm831x_gp_ldo_get_status,
  	.get_optimum_mode = wm831x_gp_ldo_get_optimum_mode,
  
  	.is_enabled = wm831x_ldo_is_enabled,
  	.enable = wm831x_ldo_enable,
  	.disable = wm831x_ldo_disable,
  };
  
  static __devinit int wm831x_gp_ldo_probe(struct platform_device *pdev)
  {
  	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
  	struct wm831x_pdata *pdata = wm831x->dev->platform_data;
  	int id = pdev->id % ARRAY_SIZE(pdata->ldo);
  	struct wm831x_ldo *ldo;
  	struct resource *res;
  	int ret, irq;
  
  	dev_dbg(&pdev->dev, "Probing LDO%d
  ", id + 1);
  
  	if (pdata == NULL || pdata->ldo[id] == NULL)
  		return -ENODEV;
  
  	ldo = kzalloc(sizeof(struct wm831x_ldo), GFP_KERNEL);
  	if (ldo == NULL) {
  		dev_err(&pdev->dev, "Unable to allocate private data
  ");
  		return -ENOMEM;
  	}
  
  	ldo->wm831x = wm831x;
  
  	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
  	if (res == NULL) {
  		dev_err(&pdev->dev, "No I/O resource
  ");
  		ret = -EINVAL;
  		goto err;
  	}
  	ldo->base = res->start;
  
  	snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
  	ldo->desc.name = ldo->name;
  	ldo->desc.id = id;
  	ldo->desc.type = REGULATOR_VOLTAGE;
  	ldo->desc.n_voltages = WM831X_GP_LDO_MAX_SELECTOR + 1;
  	ldo->desc.ops = &wm831x_gp_ldo_ops;
  	ldo->desc.owner = THIS_MODULE;
  
  	ldo->regulator = regulator_register(&ldo->desc, &pdev->dev,
  					     pdata->ldo[id], ldo);
  	if (IS_ERR(ldo->regulator)) {
  		ret = PTR_ERR(ldo->regulator);
  		dev_err(wm831x->dev, "Failed to register LDO%d: %d
  ",
  			id + 1, ret);
  		goto err;
  	}
  
  	irq = platform_get_irq_byname(pdev, "UV");

  	ret = request_threaded_irq(irq, NULL, wm831x_ldo_uv_irq,
  				   IRQF_TRIGGER_RISING, ldo->name,
  				   ldo);

  	if (ret != 0) {
  		dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d
  ",
  			irq, ret);
  		goto err_regulator;
  	}
  
  	platform_set_drvdata(pdev, ldo);
  
  	return 0;
  
  err_regulator:
  	regulator_unregister(ldo->regulator);
  err:
  	kfree(ldo);
  	return ret;
  }
  
  static __devexit int wm831x_gp_ldo_remove(struct platform_device *pdev)
  {
  	struct wm831x_ldo *ldo = platform_get_drvdata(pdev);

  	platform_set_drvdata(pdev, NULL);

  	free_irq(platform_get_irq_byname(pdev, "UV"), ldo);

  	regulator_unregister(ldo->regulator);
  	kfree(ldo);
  
  	return 0;
  }
  
  static struct platform_driver wm831x_gp_ldo_driver = {
  	.probe = wm831x_gp_ldo_probe,
  	.remove = __devexit_p(wm831x_gp_ldo_remove),
  	.driver		= {
  		.name	= "wm831x-ldo",

  		.owner	= THIS_MODULE,

  	},
  };
  
  /*
   * Analogue LDOs
   */
  
  
  #define WM831X_ALDO_SELECTOR_LOW 0xc
  #define WM831X_ALDO_MAX_SELECTOR 0x1f
  
  static int wm831x_aldo_list_voltage(struct regulator_dev *rdev,
  				      unsigned int selector)
  {
  	/* 1-1.6V in 50mV steps */
  	if (selector <= WM831X_ALDO_SELECTOR_LOW)
  		return 1000000 + (selector * 50000);
  	/* 1.7-3.5V in 50mV steps */
  	if (selector <= WM831X_ALDO_MAX_SELECTOR)
  		return 1600000 + ((selector - WM831X_ALDO_SELECTOR_LOW)
  				  * 100000);
  	return -EINVAL;
  }
  
  static int wm831x_aldo_set_voltage_int(struct regulator_dev *rdev, int reg,

  				       int min_uV, int max_uV,
  				       unsigned *selector)

  {
  	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  	struct wm831x *wm831x = ldo->wm831x;
  	int vsel, ret;
  
  	if (min_uV < 1000000)
  		vsel = 0;
  	else if (min_uV < 1700000)
  		vsel = ((min_uV - 1000000) / 50000);
  	else
  		vsel = ((min_uV - 1700000) / 100000)
  			+ WM831X_ALDO_SELECTOR_LOW + 1;
  
  	ret = wm831x_aldo_list_voltage(rdev, vsel);
  	if (ret < 0)
  		return ret;
  	if (ret < min_uV || ret > max_uV)
  		return -EINVAL;

  	*selector = vsel;

  	return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, vsel);
  }
  
  static int wm831x_aldo_set_voltage(struct regulator_dev *rdev,

  				   int min_uV, int max_uV, unsigned *selector)

  {
  	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  	int reg = ldo->base + WM831X_LDO_ON_CONTROL;

  	return wm831x_aldo_set_voltage_int(rdev, reg, min_uV, max_uV,
  					   selector);

  }
  
  static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev,
  					     int uV)
  {
  	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  	int reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;

  	unsigned int selector;

  	return wm831x_aldo_set_voltage_int(rdev, reg, uV, uV, &selector);

  }

  static int wm831x_aldo_get_voltage_sel(struct regulator_dev *rdev)

  {
  	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  	struct wm831x *wm831x = ldo->wm831x;
  	int reg = ldo->base + WM831X_LDO_ON_CONTROL;
  	int ret;
  
  	ret = wm831x_reg_read(wm831x, reg);
  	if (ret < 0)
  		return ret;
  
  	ret &= WM831X_LDO7_ON_VSEL_MASK;

  	return ret;

  }
  
  static unsigned int wm831x_aldo_get_mode(struct regulator_dev *rdev)
  {
  	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  	struct wm831x *wm831x = ldo->wm831x;
  	int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;

  	int ret;

  
  	ret = wm831x_reg_read(wm831x, on_reg);
  	if (ret < 0)
  		return 0;
  
  	if (ret & WM831X_LDO7_ON_MODE)
  		return REGULATOR_MODE_IDLE;
  	else
  		return REGULATOR_MODE_NORMAL;
  }
  
  static int wm831x_aldo_set_mode(struct regulator_dev *rdev,
  				  unsigned int mode)
  {
  	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  	struct wm831x *wm831x = ldo->wm831x;
  	int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
  	int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
  	int ret;
  
  
  	switch (mode) {
  	case REGULATOR_MODE_NORMAL:
  		ret = wm831x_set_bits(wm831x, on_reg,
  				      WM831X_LDO7_ON_MODE, 0);
  		if (ret < 0)
  			return ret;
  		break;
  
  	case REGULATOR_MODE_IDLE:
  		ret = wm831x_set_bits(wm831x, ctrl_reg,
  				      WM831X_LDO7_ON_MODE,
  				      WM831X_LDO7_ON_MODE);
  		if (ret < 0)
  			return ret;
  		break;
  
  	default:
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  static int wm831x_aldo_get_status(struct regulator_dev *rdev)
  {
  	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  	struct wm831x *wm831x = ldo->wm831x;
  	int mask = 1 << rdev_get_id(rdev);
  	int ret;
  
  	/* Is the regulator on? */
  	ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
  	if (ret < 0)
  		return ret;
  	if (!(ret & mask))
  		return REGULATOR_STATUS_OFF;
  
  	/* Is it reporting under voltage? */
  	ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
  	if (ret & mask)
  		return REGULATOR_STATUS_ERROR;
  
  	ret = wm831x_aldo_get_mode(rdev);
  	if (ret < 0)
  		return ret;
  	else
  		return regulator_mode_to_status(ret);
  }
  
  static struct regulator_ops wm831x_aldo_ops = {
  	.list_voltage = wm831x_aldo_list_voltage,

  	.get_voltage_sel = wm831x_aldo_get_voltage_sel,

  	.set_voltage = wm831x_aldo_set_voltage,
  	.set_suspend_voltage = wm831x_aldo_set_suspend_voltage,
  	.get_mode = wm831x_aldo_get_mode,
  	.set_mode = wm831x_aldo_set_mode,
  	.get_status = wm831x_aldo_get_status,
  
  	.is_enabled = wm831x_ldo_is_enabled,
  	.enable = wm831x_ldo_enable,
  	.disable = wm831x_ldo_disable,
  };
  
  static __devinit int wm831x_aldo_probe(struct platform_device *pdev)
  {
  	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
  	struct wm831x_pdata *pdata = wm831x->dev->platform_data;
  	int id = pdev->id % ARRAY_SIZE(pdata->ldo);
  	struct wm831x_ldo *ldo;
  	struct resource *res;
  	int ret, irq;
  
  	dev_dbg(&pdev->dev, "Probing LDO%d
  ", id + 1);
  
  	if (pdata == NULL || pdata->ldo[id] == NULL)
  		return -ENODEV;
  
  	ldo = kzalloc(sizeof(struct wm831x_ldo), GFP_KERNEL);
  	if (ldo == NULL) {
  		dev_err(&pdev->dev, "Unable to allocate private data
  ");
  		return -ENOMEM;
  	}
  
  	ldo->wm831x = wm831x;
  
  	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
  	if (res == NULL) {
  		dev_err(&pdev->dev, "No I/O resource
  ");
  		ret = -EINVAL;
  		goto err;
  	}
  	ldo->base = res->start;
  
  	snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
  	ldo->desc.name = ldo->name;
  	ldo->desc.id = id;
  	ldo->desc.type = REGULATOR_VOLTAGE;
  	ldo->desc.n_voltages = WM831X_ALDO_MAX_SELECTOR + 1;
  	ldo->desc.ops = &wm831x_aldo_ops;
  	ldo->desc.owner = THIS_MODULE;
  
  	ldo->regulator = regulator_register(&ldo->desc, &pdev->dev,
  					     pdata->ldo[id], ldo);
  	if (IS_ERR(ldo->regulator)) {
  		ret = PTR_ERR(ldo->regulator);
  		dev_err(wm831x->dev, "Failed to register LDO%d: %d
  ",
  			id + 1, ret);
  		goto err;
  	}
  
  	irq = platform_get_irq_byname(pdev, "UV");

  	ret = request_threaded_irq(irq, NULL, wm831x_ldo_uv_irq,
  				   IRQF_TRIGGER_RISING, ldo->name, ldo);

  	if (ret != 0) {
  		dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d
  ",
  			irq, ret);
  		goto err_regulator;
  	}
  
  	platform_set_drvdata(pdev, ldo);
  
  	return 0;
  
  err_regulator:
  	regulator_unregister(ldo->regulator);
  err:
  	kfree(ldo);
  	return ret;
  }
  
  static __devexit int wm831x_aldo_remove(struct platform_device *pdev)
  {
  	struct wm831x_ldo *ldo = platform_get_drvdata(pdev);

  	free_irq(platform_get_irq_byname(pdev, "UV"), ldo);

  	regulator_unregister(ldo->regulator);
  	kfree(ldo);
  
  	return 0;
  }
  
  static struct platform_driver wm831x_aldo_driver = {
  	.probe = wm831x_aldo_probe,
  	.remove = __devexit_p(wm831x_aldo_remove),
  	.driver		= {
  		.name	= "wm831x-aldo",

  		.owner	= THIS_MODULE,

  	},
  };
  
  /*
   * Alive LDO
   */
  
  #define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf
  
  static int wm831x_alive_ldo_list_voltage(struct regulator_dev *rdev,
  				      unsigned int selector)
  {
  	/* 0.8-1.55V in 50mV steps */
  	if (selector <= WM831X_ALIVE_LDO_MAX_SELECTOR)
  		return 800000 + (selector * 50000);
  	return -EINVAL;
  }
  
  static int wm831x_alive_ldo_set_voltage_int(struct regulator_dev *rdev,
  					    int reg,

  					    int min_uV, int max_uV,
  					    unsigned *selector)

  {
  	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  	struct wm831x *wm831x = ldo->wm831x;
  	int vsel, ret;
  
  	vsel = (min_uV - 800000) / 50000;
  
  	ret = wm831x_alive_ldo_list_voltage(rdev, vsel);
  	if (ret < 0)
  		return ret;
  	if (ret < min_uV || ret > max_uV)
  		return -EINVAL;

  	*selector = vsel;

  	return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, vsel);
  }
  
  static int wm831x_alive_ldo_set_voltage(struct regulator_dev *rdev,

  					int min_uV, int max_uV,
  					unsigned *selector)

  {
  	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  	int reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;

  	return wm831x_alive_ldo_set_voltage_int(rdev, reg, min_uV, max_uV,
  						selector);

  }
  
  static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev,
  					     int uV)
  {
  	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  	int reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL;

  	unsigned selector;

  	return wm831x_alive_ldo_set_voltage_int(rdev, reg, uV, uV, &selector);

  }

  static int wm831x_alive_ldo_get_voltage_sel(struct regulator_dev *rdev)

  {
  	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  	struct wm831x *wm831x = ldo->wm831x;
  	int reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
  	int ret;
  
  	ret = wm831x_reg_read(wm831x, reg);
  	if (ret < 0)
  		return ret;
  
  	ret &= WM831X_LDO11_ON_VSEL_MASK;

  	return ret;

  }
  
  static int wm831x_alive_ldo_get_status(struct regulator_dev *rdev)
  {
  	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  	struct wm831x *wm831x = ldo->wm831x;
  	int mask = 1 << rdev_get_id(rdev);
  	int ret;
  
  	/* Is the regulator on? */
  	ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
  	if (ret < 0)
  		return ret;
  	if (ret & mask)
  		return REGULATOR_STATUS_ON;
  	else
  		return REGULATOR_STATUS_OFF;
  }
  
  static struct regulator_ops wm831x_alive_ldo_ops = {
  	.list_voltage = wm831x_alive_ldo_list_voltage,

  	.get_voltage_sel = wm831x_alive_ldo_get_voltage_sel,

  	.set_voltage = wm831x_alive_ldo_set_voltage,
  	.set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage,
  	.get_status = wm831x_alive_ldo_get_status,
  
  	.is_enabled = wm831x_ldo_is_enabled,
  	.enable = wm831x_ldo_enable,
  	.disable = wm831x_ldo_disable,
  };
  
  static __devinit int wm831x_alive_ldo_probe(struct platform_device *pdev)
  {
  	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
  	struct wm831x_pdata *pdata = wm831x->dev->platform_data;
  	int id = pdev->id % ARRAY_SIZE(pdata->ldo);
  	struct wm831x_ldo *ldo;
  	struct resource *res;
  	int ret;
  
  	dev_dbg(&pdev->dev, "Probing LDO%d
  ", id + 1);
  
  	if (pdata == NULL || pdata->ldo[id] == NULL)
  		return -ENODEV;
  
  	ldo = kzalloc(sizeof(struct wm831x_ldo), GFP_KERNEL);
  	if (ldo == NULL) {
  		dev_err(&pdev->dev, "Unable to allocate private data
  ");
  		return -ENOMEM;
  	}
  
  	ldo->wm831x = wm831x;
  
  	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
  	if (res == NULL) {
  		dev_err(&pdev->dev, "No I/O resource
  ");
  		ret = -EINVAL;
  		goto err;
  	}
  	ldo->base = res->start;
  
  	snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
  	ldo->desc.name = ldo->name;
  	ldo->desc.id = id;
  	ldo->desc.type = REGULATOR_VOLTAGE;
  	ldo->desc.n_voltages = WM831X_ALIVE_LDO_MAX_SELECTOR + 1;
  	ldo->desc.ops = &wm831x_alive_ldo_ops;
  	ldo->desc.owner = THIS_MODULE;
  
  	ldo->regulator = regulator_register(&ldo->desc, &pdev->dev,
  					     pdata->ldo[id], ldo);
  	if (IS_ERR(ldo->regulator)) {
  		ret = PTR_ERR(ldo->regulator);
  		dev_err(wm831x->dev, "Failed to register LDO%d: %d
  ",
  			id + 1, ret);
  		goto err;
  	}
  
  	platform_set_drvdata(pdev, ldo);
  
  	return 0;
  
  err:
  	kfree(ldo);
  	return ret;
  }
  
  static __devexit int wm831x_alive_ldo_remove(struct platform_device *pdev)
  {
  	struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
  
  	regulator_unregister(ldo->regulator);
  	kfree(ldo);
  
  	return 0;
  }
  
  static struct platform_driver wm831x_alive_ldo_driver = {
  	.probe = wm831x_alive_ldo_probe,
  	.remove = __devexit_p(wm831x_alive_ldo_remove),
  	.driver		= {
  		.name	= "wm831x-alive-ldo",

  		.owner	= THIS_MODULE,

  	},
  };
  
  static int __init wm831x_ldo_init(void)
  {
  	int ret;
  
  	ret = platform_driver_register(&wm831x_gp_ldo_driver);
  	if (ret != 0)
  		pr_err("Failed to register WM831x GP LDO driver: %d
  ", ret);
  
  	ret = platform_driver_register(&wm831x_aldo_driver);
  	if (ret != 0)
  		pr_err("Failed to register WM831x ALDO driver: %d
  ", ret);
  
  	ret = platform_driver_register(&wm831x_alive_ldo_driver);
  	if (ret != 0)
  		pr_err("Failed to register WM831x alive LDO driver: %d
  ",
  		       ret);
  
  	return 0;
  }
  subsys_initcall(wm831x_ldo_init);
  
  static void __exit wm831x_ldo_exit(void)
  {
  	platform_driver_unregister(&wm831x_alive_ldo_driver);
  	platform_driver_unregister(&wm831x_aldo_driver);
  	platform_driver_unregister(&wm831x_gp_ldo_driver);
  }
  module_exit(wm831x_ldo_exit);
  
  /* Module information */
  MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
  MODULE_DESCRIPTION("WM831x LDO driver");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS("platform:wm831x-ldo");
  MODULE_ALIAS("platform:wm831x-aldo");
  MODULE_ALIAS("platform:wm831x-aliveldo");