drivers/regulator/wm831x-ldo.c - kernel/msm-4.9 - Gitiles

 /*
  * 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 9

 #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];
 	char supply_name[WM831X_LDO_MAX_NAME];
 	struct regulator_desc desc;
 	int base;
 	struct wm831x *wm831x;
 	struct regulator_dev *regulator;
 };

 /*
  * Shared
  */

 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
  */

 static const struct regulator_linear_range wm831x_gp_ldo_ranges[] = {
 	{ .min_uV =  900000, .max_uV = 1650000, .min_sel =  0, .max_sel = 14,
 	  .uV_step =  50000 },
 	{ .min_uV = 1700000, .max_uV = 3300000, .min_sel = 15, .max_sel = 31,
 	  .uV_step = 100000 },
 };

 static int wm831x_gp_ldo_set_suspend_voltage(struct regulator_dev *rdev,
 					     int uV)
 {
 	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 	struct wm831x *wm831x = ldo->wm831x;
 	int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;

 	sel = regulator_map_voltage_linear_range(rdev, uV, uV);
 	if (sel < 0)
 		return sel;

 	return wm831x_set_bits(wm831x, reg, WM831X_LDO1_ON_VSEL_MASK, sel);
 }

 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 < 0)
 		return ret;
 	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 = regulator_list_voltage_linear_range,
 	.map_voltage = regulator_map_voltage_linear_range,
 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
 	.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,
 	.get_bypass = regulator_get_bypass_regmap,
 	.set_bypass = regulator_set_bypass_regmap,

 	.is_enabled = regulator_is_enabled_regmap,
 	.enable = regulator_enable_regmap,
 	.disable = regulator_disable_regmap,
 };

 static 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;
 	struct regulator_config config = { };
 	int id;
 	struct wm831x_ldo *ldo;
 	struct resource *res;
 	int ret, irq;

 	if (pdata && pdata->wm831x_num)
 		id = (pdata->wm831x_num * 10) + 1;
 	else
 		id = 0;
 	id = pdev->id - id;

 	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);

 	ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
 	if (ldo == NULL) {
 		dev_err(&pdev->dev, "Unable to allocate private data\n");
 		return -ENOMEM;
 	}

 	ldo->wm831x = wm831x;

 	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 	if (res == NULL) {
 		dev_err(&pdev->dev, "No REG resource\n");
 		ret = -EINVAL;
 		goto err;
 	}
 	ldo->base = res->start;

 	snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
 	ldo->desc.name = ldo->name;

 	snprintf(ldo->supply_name, sizeof(ldo->supply_name),
 		 "LDO%dVDD", id + 1);
 	ldo->desc.supply_name = ldo->supply_name;

 	ldo->desc.id = id;
 	ldo->desc.type = REGULATOR_VOLTAGE;
 	ldo->desc.n_voltages = 32;
 	ldo->desc.ops = &wm831x_gp_ldo_ops;
 	ldo->desc.owner = THIS_MODULE;
 	ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 	ldo->desc.vsel_mask = WM831X_LDO1_ON_VSEL_MASK;
 	ldo->desc.enable_reg = WM831X_LDO_ENABLE;
 	ldo->desc.enable_mask = 1 << id;
 	ldo->desc.bypass_reg = ldo->base;
 	ldo->desc.bypass_mask = WM831X_LDO1_SWI;
 	ldo->desc.linear_ranges = wm831x_gp_ldo_ranges;
 	ldo->desc.n_linear_ranges = ARRAY_SIZE(wm831x_gp_ldo_ranges);

 	config.dev = pdev->dev.parent;
 	if (pdata)
 		config.init_data = pdata->ldo[id];
 	config.driver_data = ldo;
 	config.regmap = wm831x->regmap;

 	ldo->regulator = regulator_register(&ldo->desc, &config);
 	if (IS_ERR(ldo->regulator)) {
 		ret = PTR_ERR(ldo->regulator);
 		dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
 			id + 1, ret);
 		goto err;
 	}

 	irq = wm831x_irq(wm831x, 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\n",
 			irq, ret);
 		goto err_regulator;
 	}

 	platform_set_drvdata(pdev, ldo);

 	return 0;

 err_regulator:
 	regulator_unregister(ldo->regulator);
 err:
 	return ret;
 }

 static int wm831x_gp_ldo_remove(struct platform_device *pdev)
 {
 	struct wm831x_ldo *ldo = platform_get_drvdata(pdev);

 	free_irq(wm831x_irq(ldo->wm831x,
 			    platform_get_irq_byname(pdev, "UV")), ldo);
 	regulator_unregister(ldo->regulator);

 	return 0;
 }

 static struct platform_driver wm831x_gp_ldo_driver = {
 	.probe = wm831x_gp_ldo_probe,
 	.remove = wm831x_gp_ldo_remove,
 	.driver		= {
 		.name	= "wm831x-ldo",
 		.owner	= THIS_MODULE,
 	},
 };

 /*
  * Analogue LDOs
  */

 static const struct regulator_linear_range wm831x_aldo_ranges[] = {
 	{ .min_uV = 1000000, .max_uV = 1650000, .min_sel =  0, .max_sel = 12,
 	  .uV_step =  50000 },
 	{ .min_uV = 1700000, .max_uV = 3500000, .min_sel = 13, .max_sel = 31,
 	  .uV_step = 100000 },
 };

 static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev,
 					     int uV)
 {
 	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 	struct wm831x *wm831x = ldo->wm831x;
 	int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;

 	sel = regulator_map_voltage_linear_range(rdev, uV, uV);
 	if (sel < 0)
 		return sel;

 	return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, sel);
 }

 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 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, on_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 < 0)
 		return ret;
 	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 = regulator_list_voltage_linear_range,
 	.map_voltage = regulator_map_voltage_linear_range,
 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
 	.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,
 	.set_bypass = regulator_set_bypass_regmap,
 	.get_bypass = regulator_get_bypass_regmap,

 	.is_enabled = regulator_is_enabled_regmap,
 	.enable = regulator_enable_regmap,
 	.disable = regulator_disable_regmap,
 };

 static 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;
 	struct regulator_config config = { };
 	int id;
 	struct wm831x_ldo *ldo;
 	struct resource *res;
 	int ret, irq;

 	if (pdata && pdata->wm831x_num)
 		id = (pdata->wm831x_num * 10) + 1;
 	else
 		id = 0;
 	id = pdev->id - id;

 	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);

 	ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
 	if (ldo == NULL) {
 		dev_err(&pdev->dev, "Unable to allocate private data\n");
 		return -ENOMEM;
 	}

 	ldo->wm831x = wm831x;

 	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 	if (res == NULL) {
 		dev_err(&pdev->dev, "No REG resource\n");
 		ret = -EINVAL;
 		goto err;
 	}
 	ldo->base = res->start;

 	snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
 	ldo->desc.name = ldo->name;

 	snprintf(ldo->supply_name, sizeof(ldo->supply_name),
 		 "LDO%dVDD", id + 1);
 	ldo->desc.supply_name = ldo->supply_name;

 	ldo->desc.id = id;
 	ldo->desc.type = REGULATOR_VOLTAGE;
 	ldo->desc.n_voltages = 32;
 	ldo->desc.linear_ranges = wm831x_aldo_ranges;
 	ldo->desc.n_linear_ranges = ARRAY_SIZE(wm831x_aldo_ranges);
 	ldo->desc.ops = &wm831x_aldo_ops;
 	ldo->desc.owner = THIS_MODULE;
 	ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 	ldo->desc.vsel_mask = WM831X_LDO7_ON_VSEL_MASK;
 	ldo->desc.enable_reg = WM831X_LDO_ENABLE;
 	ldo->desc.enable_mask = 1 << id;
 	ldo->desc.bypass_reg = ldo->base;
 	ldo->desc.bypass_mask = WM831X_LDO7_SWI;

 	config.dev = pdev->dev.parent;
 	if (pdata)
 		config.init_data = pdata->ldo[id];
 	config.driver_data = ldo;
 	config.regmap = wm831x->regmap;

 	ldo->regulator = regulator_register(&ldo->desc, &config);
 	if (IS_ERR(ldo->regulator)) {
 		ret = PTR_ERR(ldo->regulator);
 		dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
 			id + 1, ret);
 		goto err;
 	}

 	irq = wm831x_irq(wm831x, 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\n",
 			irq, ret);
 		goto err_regulator;
 	}

 	platform_set_drvdata(pdev, ldo);

 	return 0;

 err_regulator:
 	regulator_unregister(ldo->regulator);
 err:
 	return ret;
 }

 static int wm831x_aldo_remove(struct platform_device *pdev)
 {
 	struct wm831x_ldo *ldo = platform_get_drvdata(pdev);

 	free_irq(wm831x_irq(ldo->wm831x, platform_get_irq_byname(pdev, "UV")),
 		 ldo);
 	regulator_unregister(ldo->regulator);

 	return 0;
 }

 static struct platform_driver wm831x_aldo_driver = {
 	.probe = wm831x_aldo_probe,
 	.remove = wm831x_aldo_remove,
 	.driver		= {
 		.name	= "wm831x-aldo",
 		.owner	= THIS_MODULE,
 	},
 };

 /*
  * Alive LDO
  */

 #define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf

 static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev,
 					     int uV)
 {
 	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 	struct wm831x *wm831x = ldo->wm831x;
 	int sel, reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL;

 	sel = regulator_map_voltage_linear(rdev, uV, uV);
 	if (sel < 0)
 		return sel;

 	return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, sel);
 }

 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 = regulator_list_voltage_linear,
 	.map_voltage = regulator_map_voltage_linear,
 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
 	.set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage,
 	.get_status = wm831x_alive_ldo_get_status,

 	.is_enabled = regulator_is_enabled_regmap,
 	.enable = regulator_enable_regmap,
 	.disable = regulator_disable_regmap,
 };

 static 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;
 	struct regulator_config config = { };
 	int id;
 	struct wm831x_ldo *ldo;
 	struct resource *res;
 	int ret;

 	if (pdata && pdata->wm831x_num)
 		id = (pdata->wm831x_num * 10) + 1;
 	else
 		id = 0;
 	id = pdev->id - id;


 	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);

 	ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
 	if (ldo == NULL) {
 		dev_err(&pdev->dev, "Unable to allocate private data\n");
 		return -ENOMEM;
 	}

 	ldo->wm831x = wm831x;

 	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 	if (res == NULL) {
 		dev_err(&pdev->dev, "No REG resource\n");
 		ret = -EINVAL;
 		goto err;
 	}
 	ldo->base = res->start;

 	snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
 	ldo->desc.name = ldo->name;

 	snprintf(ldo->supply_name, sizeof(ldo->supply_name),
 		 "LDO%dVDD", id + 1);
 	ldo->desc.supply_name = ldo->supply_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->desc.vsel_reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
 	ldo->desc.vsel_mask = WM831X_LDO11_ON_VSEL_MASK;
 	ldo->desc.enable_reg = WM831X_LDO_ENABLE;
 	ldo->desc.enable_mask = 1 << id;
 	ldo->desc.min_uV = 800000;
 	ldo->desc.uV_step = 50000;
 	ldo->desc.enable_time = 1000;

 	config.dev = pdev->dev.parent;
 	if (pdata)
 		config.init_data = pdata->ldo[id];
 	config.driver_data = ldo;
 	config.regmap = wm831x->regmap;

 	ldo->regulator = regulator_register(&ldo->desc, &config);
 	if (IS_ERR(ldo->regulator)) {
 		ret = PTR_ERR(ldo->regulator);
 		dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
 			id + 1, ret);
 		goto err;
 	}

 	platform_set_drvdata(pdev, ldo);

 	return 0;

 err:
 	return ret;
 }

 static int wm831x_alive_ldo_remove(struct platform_device *pdev)
 {
 	struct wm831x_ldo *ldo = platform_get_drvdata(pdev);

 	regulator_unregister(ldo->regulator);

 	return 0;
 }

 static struct platform_driver wm831x_alive_ldo_driver = {
 	.probe = wm831x_alive_ldo_probe,
 	.remove = 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\n", ret);

 	ret = platform_driver_register(&wm831x_aldo_driver);
 	if (ret != 0)
 		pr_err("Failed to register WM831x ALDO driver: %d\n", ret);

 	ret = platform_driver_register(&wm831x_alive_ldo_driver);
 	if (ret != 0)
 		pr_err("Failed to register WM831x alive LDO driver: %d\n",
 		       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");
	/*
	* 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 9

	#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];
	char supply_name[WM831X_LDO_MAX_NAME];
	struct regulator_desc desc;
	int base;
	struct wm831x *wm831x;
	struct regulator_dev *regulator;
	};

	/*
	* Shared
	*/

	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
	*/

	static const struct regulator_linear_range wm831x_gp_ldo_ranges[] = {
	{ .min_uV = 900000, .max_uV = 1650000, .min_sel = 0, .max_sel = 14,
	.uV_step = 50000 },
	{ .min_uV = 1700000, .max_uV = 3300000, .min_sel = 15, .max_sel = 31,
	.uV_step = 100000 },
	};

	static int wm831x_gp_ldo_set_suspend_voltage(struct regulator_dev *rdev,
	int uV)
	{
	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = ldo->wm831x;
	int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;

	sel = regulator_map_voltage_linear_range(rdev, uV, uV);
	if (sel < 0)
	return sel;

	return wm831x_set_bits(wm831x, reg, WM831X_LDO1_ON_VSEL_MASK, sel);
	}

	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 < 0)
	return ret;
	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 = regulator_list_voltage_linear_range,
	.map_voltage = regulator_map_voltage_linear_range,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.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,
	.get_bypass = regulator_get_bypass_regmap,
	.set_bypass = regulator_set_bypass_regmap,

	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	};

	static 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;
	struct regulator_config config = { };
	int id;
	struct wm831x_ldo *ldo;
	struct resource *res;
	int ret, irq;

	if (pdata && pdata->wm831x_num)
	id = (pdata->wm831x_num * 10) + 1;
	else
	id = 0;
	id = pdev->id - id;

	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);

	ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
	if (ldo == NULL) {
	dev_err(&pdev->dev, "Unable to allocate private data\n");
	return -ENOMEM;
	}

	ldo->wm831x = wm831x;

	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
	if (res == NULL) {
	dev_err(&pdev->dev, "No REG resource\n");
	ret = -EINVAL;
	goto err;
	}
	ldo->base = res->start;

	snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
	ldo->desc.name = ldo->name;

	snprintf(ldo->supply_name, sizeof(ldo->supply_name),
	"LDO%dVDD", id + 1);
	ldo->desc.supply_name = ldo->supply_name;

	ldo->desc.id = id;
	ldo->desc.type = REGULATOR_VOLTAGE;
	ldo->desc.n_voltages = 32;
	ldo->desc.ops = &wm831x_gp_ldo_ops;
	ldo->desc.owner = THIS_MODULE;
	ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
	ldo->desc.vsel_mask = WM831X_LDO1_ON_VSEL_MASK;
	ldo->desc.enable_reg = WM831X_LDO_ENABLE;
	ldo->desc.enable_mask = 1 << id;
	ldo->desc.bypass_reg = ldo->base;
	ldo->desc.bypass_mask = WM831X_LDO1_SWI;
	ldo->desc.linear_ranges = wm831x_gp_ldo_ranges;
	ldo->desc.n_linear_ranges = ARRAY_SIZE(wm831x_gp_ldo_ranges);

	config.dev = pdev->dev.parent;
	if (pdata)
	config.init_data = pdata->ldo[id];
	config.driver_data = ldo;
	config.regmap = wm831x->regmap;

	ldo->regulator = regulator_register(&ldo->desc, &config);
	if (IS_ERR(ldo->regulator)) {
	ret = PTR_ERR(ldo->regulator);
	dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
	id + 1, ret);
	goto err;
	}

	irq = wm831x_irq(wm831x, 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\n",
	irq, ret);
	goto err_regulator;
	}

	platform_set_drvdata(pdev, ldo);

	return 0;

	err_regulator:
	regulator_unregister(ldo->regulator);
	err:
	return ret;
	}

	static int wm831x_gp_ldo_remove(struct platform_device *pdev)
	{
	struct wm831x_ldo *ldo = platform_get_drvdata(pdev);

	free_irq(wm831x_irq(ldo->wm831x,
	platform_get_irq_byname(pdev, "UV")), ldo);
	regulator_unregister(ldo->regulator);

	return 0;
	}

	static struct platform_driver wm831x_gp_ldo_driver = {
	.probe = wm831x_gp_ldo_probe,
	.remove = wm831x_gp_ldo_remove,
	.driver = {
	.name = "wm831x-ldo",
	.owner = THIS_MODULE,
	},
	};

	/*
	* Analogue LDOs
	*/

	static const struct regulator_linear_range wm831x_aldo_ranges[] = {
	{ .min_uV = 1000000, .max_uV = 1650000, .min_sel = 0, .max_sel = 12,
	.uV_step = 50000 },
	{ .min_uV = 1700000, .max_uV = 3500000, .min_sel = 13, .max_sel = 31,
	.uV_step = 100000 },
	};

	static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev,
	int uV)
	{
	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = ldo->wm831x;
	int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;

	sel = regulator_map_voltage_linear_range(rdev, uV, uV);
	if (sel < 0)
	return sel;

	return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, sel);
	}

	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 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, on_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 < 0)
	return ret;
	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 = regulator_list_voltage_linear_range,
	.map_voltage = regulator_map_voltage_linear_range,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.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,
	.set_bypass = regulator_set_bypass_regmap,
	.get_bypass = regulator_get_bypass_regmap,

	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	};

	static 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;
	struct regulator_config config = { };
	int id;
	struct wm831x_ldo *ldo;
	struct resource *res;
	int ret, irq;

	if (pdata && pdata->wm831x_num)
	id = (pdata->wm831x_num * 10) + 1;
	else
	id = 0;
	id = pdev->id - id;

	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);

	ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
	if (ldo == NULL) {
	dev_err(&pdev->dev, "Unable to allocate private data\n");
	return -ENOMEM;
	}

	ldo->wm831x = wm831x;

	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
	if (res == NULL) {
	dev_err(&pdev->dev, "No REG resource\n");
	ret = -EINVAL;
	goto err;
	}
	ldo->base = res->start;

	snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
	ldo->desc.name = ldo->name;

	snprintf(ldo->supply_name, sizeof(ldo->supply_name),
	"LDO%dVDD", id + 1);
	ldo->desc.supply_name = ldo->supply_name;

	ldo->desc.id = id;
	ldo->desc.type = REGULATOR_VOLTAGE;
	ldo->desc.n_voltages = 32;
	ldo->desc.linear_ranges = wm831x_aldo_ranges;
	ldo->desc.n_linear_ranges = ARRAY_SIZE(wm831x_aldo_ranges);
	ldo->desc.ops = &wm831x_aldo_ops;
	ldo->desc.owner = THIS_MODULE;
	ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
	ldo->desc.vsel_mask = WM831X_LDO7_ON_VSEL_MASK;
	ldo->desc.enable_reg = WM831X_LDO_ENABLE;
	ldo->desc.enable_mask = 1 << id;
	ldo->desc.bypass_reg = ldo->base;
	ldo->desc.bypass_mask = WM831X_LDO7_SWI;

	config.dev = pdev->dev.parent;
	if (pdata)
	config.init_data = pdata->ldo[id];
	config.driver_data = ldo;
	config.regmap = wm831x->regmap;

	ldo->regulator = regulator_register(&ldo->desc, &config);
	if (IS_ERR(ldo->regulator)) {
	ret = PTR_ERR(ldo->regulator);
	dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
	id + 1, ret);
	goto err;
	}

	irq = wm831x_irq(wm831x, 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\n",
	irq, ret);
	goto err_regulator;
	}

	platform_set_drvdata(pdev, ldo);

	return 0;

	err_regulator:
	regulator_unregister(ldo->regulator);
	err:
	return ret;
	}

	static int wm831x_aldo_remove(struct platform_device *pdev)
	{
	struct wm831x_ldo *ldo = platform_get_drvdata(pdev);

	free_irq(wm831x_irq(ldo->wm831x, platform_get_irq_byname(pdev, "UV")),
	ldo);
	regulator_unregister(ldo->regulator);

	return 0;
	}

	static struct platform_driver wm831x_aldo_driver = {
	.probe = wm831x_aldo_probe,
	.remove = wm831x_aldo_remove,
	.driver = {
	.name = "wm831x-aldo",
	.owner = THIS_MODULE,
	},
	};

	/*
	* Alive LDO
	*/

	#define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf

	static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev,
	int uV)
	{
	struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = ldo->wm831x;
	int sel, reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL;

	sel = regulator_map_voltage_linear(rdev, uV, uV);
	if (sel < 0)
	return sel;

	return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, sel);
	}

	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 = regulator_list_voltage_linear,
	.map_voltage = regulator_map_voltage_linear,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage,
	.get_status = wm831x_alive_ldo_get_status,

	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	};

	static 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;
	struct regulator_config config = { };
	int id;
	struct wm831x_ldo *ldo;
	struct resource *res;
	int ret;

	if (pdata && pdata->wm831x_num)
	id = (pdata->wm831x_num * 10) + 1;
	else
	id = 0;
	id = pdev->id - id;


	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);

	ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
	if (ldo == NULL) {
	dev_err(&pdev->dev, "Unable to allocate private data\n");
	return -ENOMEM;
	}

	ldo->wm831x = wm831x;

	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
	if (res == NULL) {
	dev_err(&pdev->dev, "No REG resource\n");
	ret = -EINVAL;
	goto err;
	}
	ldo->base = res->start;

	snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
	ldo->desc.name = ldo->name;

	snprintf(ldo->supply_name, sizeof(ldo->supply_name),
	"LDO%dVDD", id + 1);
	ldo->desc.supply_name = ldo->supply_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->desc.vsel_reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
	ldo->desc.vsel_mask = WM831X_LDO11_ON_VSEL_MASK;
	ldo->desc.enable_reg = WM831X_LDO_ENABLE;
	ldo->desc.enable_mask = 1 << id;
	ldo->desc.min_uV = 800000;
	ldo->desc.uV_step = 50000;
	ldo->desc.enable_time = 1000;

	config.dev = pdev->dev.parent;
	if (pdata)
	config.init_data = pdata->ldo[id];
	config.driver_data = ldo;
	config.regmap = wm831x->regmap;

	ldo->regulator = regulator_register(&ldo->desc, &config);
	if (IS_ERR(ldo->regulator)) {
	ret = PTR_ERR(ldo->regulator);
	dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
	id + 1, ret);
	goto err;
	}

	platform_set_drvdata(pdev, ldo);

	return 0;

	err:
	return ret;
	}

	static int wm831x_alive_ldo_remove(struct platform_device *pdev)
	{
	struct wm831x_ldo *ldo = platform_get_drvdata(pdev);

	regulator_unregister(ldo->regulator);

	return 0;
	}

	static struct platform_driver wm831x_alive_ldo_driver = {
	.probe = wm831x_alive_ldo_probe,
	.remove = 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\n", ret);

	ret = platform_driver_register(&wm831x_aldo_driver);
	if (ret != 0)
	pr_err("Failed to register WM831x ALDO driver: %d\n", ret);

	ret = platform_driver_register(&wm831x_alive_ldo_driver);
	if (ret != 0)
	pr_err("Failed to register WM831x alive LDO driver: %d\n",
	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");