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Commit e4ee831f authored by Mark Brown's avatar Mark Brown Committed by Samuel Ortiz
Browse files

regulator: Add WM831x DC-DC buck convertor support 



The WM831x series of devices all have 3 DC-DC buck convertors. This
driver implements software control for these regulators via the
regulator API.  Use with split hardware/software control of individual
regulators is not supported, though regulators not controlled by
software may be controlled via the hardware control interfaces.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: default avatarLiam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent be721979

drivers/regulator/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -82,6 +82,13 @@ config REGULATOR_TWL4030 
	  This driver supports the voltage regulators provided by

	  this family of companion chips.



config REGULATOR_WM831X

	tristate "Wolfson Microelcronics WM831x PMIC regulators"

	depends on MFD_WM831X

	help

	  Support the voltage and current regulators of the WM831x series

	  of PMIC devices.



config REGULATOR_WM8350

	tristate "Wolfson Microelectroncis WM8350 AudioPlus PMIC"

	depends on MFD_WM8350

drivers/regulator/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ obj-$(CONFIG_REGULATOR_BQ24022) += bq24022.o 
obj-$(CONFIG_REGULATOR_LP3971) += lp3971.o

obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o

obj-$(CONFIG_REGULATOR_TWL4030) += twl4030-regulator.o

obj-$(CONFIG_REGULATOR_WM831X) += wm831x-dcdc.o

obj-$(CONFIG_REGULATOR_WM8350) += wm8350-regulator.o

obj-$(CONFIG_REGULATOR_WM8400) += wm8400-regulator.o

obj-$(CONFIG_REGULATOR_DA903X)	+= da903x.o

drivers/regulator/wm831x-dcdc.c

0 → 100644
+643 −0
Original line number Diff line number Diff line 
/*

 * wm831x-dcdc.c  --  DC-DC buck convertor 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/mfd/wm831x/core.h>

#include <linux/mfd/wm831x/regulator.h>

#include <linux/mfd/wm831x/pdata.h>



#define WM831X_BUCKV_MAX_SELECTOR 0x68

#define WM831X_BUCKP_MAX_SELECTOR 0x66



#define WM831X_DCDC_MODE_FAST    0

#define WM831X_DCDC_MODE_NORMAL  1

#define WM831X_DCDC_MODE_IDLE    2

#define WM831X_DCDC_MODE_STANDBY 3



#define WM831X_DCDC_MAX_NAME 6



/* Register offsets in control block */

#define WM831X_DCDC_CONTROL_1     0

#define WM831X_DCDC_CONTROL_2     1

#define WM831X_DCDC_ON_CONFIG     2

#define WM831X_DCDC_SLEEP_CONTROL 3



/*

 * Shared

 */



struct wm831x_dcdc {

	char name[WM831X_DCDC_MAX_NAME];

	struct regulator_desc desc;

	int base;

	struct wm831x *wm831x;

	struct regulator_dev *regulator;

};



static int wm831x_dcdc_is_enabled(struct regulator_dev *rdev)

{

	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);

	struct wm831x *wm831x = dcdc->wm831x;

	int mask = 1 << rdev_get_id(rdev);

	int reg;



	reg = wm831x_reg_read(wm831x, WM831X_DCDC_ENABLE);

	if (reg < 0)

		return reg;



	if (reg & mask)

		return 1;

	else

		return 0;

}



static int wm831x_dcdc_enable(struct regulator_dev *rdev)

{

	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);

	struct wm831x *wm831x = dcdc->wm831x;

	int mask = 1 << rdev_get_id(rdev);



	return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, mask);

}



static int wm831x_dcdc_disable(struct regulator_dev *rdev)

{

	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);

	struct wm831x *wm831x = dcdc->wm831x;

	int mask = 1 << rdev_get_id(rdev);



	return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, 0);

}



static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)



{

	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);

	struct wm831x *wm831x = dcdc->wm831x;

	u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;

	int val;



	val = wm831x_reg_read(wm831x, reg);

	if (val < 0)

		return val;



	val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;



	switch (val) {

	case WM831X_DCDC_MODE_FAST:

		return REGULATOR_MODE_FAST;

	case WM831X_DCDC_MODE_NORMAL:

		return REGULATOR_MODE_NORMAL;

	case WM831X_DCDC_MODE_STANDBY:

		return REGULATOR_MODE_STANDBY;

	case WM831X_DCDC_MODE_IDLE:

		return REGULATOR_MODE_IDLE;

	default:

		BUG();

	}

}



static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,

				    unsigned int mode)

{

	int val;



	switch (mode) {

	case REGULATOR_MODE_FAST:

		val = WM831X_DCDC_MODE_FAST;

		break;

	case REGULATOR_MODE_NORMAL:

		val = WM831X_DCDC_MODE_NORMAL;

		break;

	case REGULATOR_MODE_STANDBY:

		val = WM831X_DCDC_MODE_STANDBY;

		break;

	case REGULATOR_MODE_IDLE:

		val = WM831X_DCDC_MODE_IDLE;

		break;

	default:

		return -EINVAL;

	}



	return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,

			       val << WM831X_DC1_ON_MODE_SHIFT);

}



static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)

{

	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);

	struct wm831x *wm831x = dcdc->wm831x;

	u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;



	return wm831x_dcdc_set_mode_int(wm831x, reg, mode);

}



static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,

					unsigned int mode)

{

	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);

	struct wm831x *wm831x = dcdc->wm831x;

	u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;



	return wm831x_dcdc_set_mode_int(wm831x, reg, mode);

}



static int wm831x_dcdc_get_status(struct regulator_dev *rdev)

{

	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);

	struct wm831x *wm831x = dcdc->wm831x;

	int ret;



	/* First, check for errors */

	ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);

	if (ret < 0)

		return ret;



	if (ret & (1 << rdev_get_id(rdev))) {

		dev_dbg(wm831x->dev, "DCDC%d under voltage\n",

			rdev_get_id(rdev) + 1);

		return REGULATOR_STATUS_ERROR;

	}



	/* DCDC1 and DCDC2 can additionally detect high voltage/current */

	if (rdev_get_id(rdev) < 2) {

		if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {

			dev_dbg(wm831x->dev, "DCDC%d over voltage\n",

				rdev_get_id(rdev) + 1);

			return REGULATOR_STATUS_ERROR;

		}



		if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {

			dev_dbg(wm831x->dev, "DCDC%d over current\n",

				rdev_get_id(rdev) + 1);

			return REGULATOR_STATUS_ERROR;

		}

	}



	/* Is the regulator on? */

	ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);

	if (ret < 0)

		return ret;

	if (!(ret & (1 << rdev_get_id(rdev))))

		return REGULATOR_STATUS_OFF;



	/* TODO: When we handle hardware control modes so we can report the

	 * current mode. */

	return REGULATOR_STATUS_ON;

}



static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)

{

	struct wm831x_dcdc *dcdc = data;



	regulator_notifier_call_chain(dcdc->regulator,

				      REGULATOR_EVENT_UNDER_VOLTAGE,

				      NULL);



	return IRQ_HANDLED;

}



static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)

{

	struct wm831x_dcdc *dcdc = data;



	regulator_notifier_call_chain(dcdc->regulator,

				      REGULATOR_EVENT_OVER_CURRENT,

				      NULL);



	return IRQ_HANDLED;

}



/*

 * BUCKV specifics

 */



static int wm831x_buckv_list_voltage(struct regulator_dev *rdev,

				      unsigned selector)

{

	if (selector <= 0x8)

		return 600000;

	if (selector <= WM831X_BUCKV_MAX_SELECTOR)

		return 600000 + ((selector - 0x8) * 12500);

	return -EINVAL;

}



static int wm831x_buckv_set_voltage_int(struct regulator_dev *rdev, int reg,

					 int min_uV, int max_uV)

{

	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);

	struct wm831x *wm831x = dcdc->wm831x;

	u16 vsel;



	if (min_uV < 600000)

		vsel = 0;

	else if (min_uV <= 1800000)

		vsel = ((min_uV - 600000) / 12500) + 8;

	else

		return -EINVAL;



	if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV)

		return -EINVAL;



	return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_VSEL_MASK, vsel);

}



static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,

				     int min_uV, int max_uV)

{

	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);

	u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;



	return wm831x_buckv_set_voltage_int(rdev, reg, min_uV, max_uV);

}



static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,

					     int uV)

{

	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);

	u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;



	return wm831x_buckv_set_voltage_int(rdev, reg, uV, uV);

}



static int wm831x_buckv_get_voltage(struct regulator_dev *rdev)

{

	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);

	struct wm831x *wm831x = dcdc->wm831x;

	u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;

	int val;



	val = wm831x_reg_read(wm831x, reg);

	if (val < 0)

		return val;



	return wm831x_buckv_list_voltage(rdev, val & WM831X_DC1_ON_VSEL_MASK);

}



/* Current limit options */

static u16 wm831x_dcdc_ilim[] = {

	125, 250, 375, 500, 625, 750, 875, 1000

};



static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,

					   int min_uA, int max_uA)

{

	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);

	struct wm831x *wm831x = dcdc->wm831x;

	u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;

	int i;



	for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {

		if (max_uA <= wm831x_dcdc_ilim[i])

			break;

	}

	if (i == ARRAY_SIZE(wm831x_dcdc_ilim))

		return -EINVAL;



	return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i);

}



static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)

{

	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);

	struct wm831x *wm831x = dcdc->wm831x;

	u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;

	int val;



	val = wm831x_reg_read(wm831x, reg);

	if (val < 0)

		return val;



	return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK];

}



static struct regulator_ops wm831x_buckv_ops = {

	.set_voltage = wm831x_buckv_set_voltage,

	.get_voltage = wm831x_buckv_get_voltage,

	.list_voltage = wm831x_buckv_list_voltage,

	.set_suspend_voltage = wm831x_buckv_set_suspend_voltage,

	.set_current_limit = wm831x_buckv_set_current_limit,

	.get_current_limit = wm831x_buckv_get_current_limit,



	.is_enabled = wm831x_dcdc_is_enabled,

	.enable = wm831x_dcdc_enable,

	.disable = wm831x_dcdc_disable,

	.get_status = wm831x_dcdc_get_status,

	.get_mode = wm831x_dcdc_get_mode,

	.set_mode = wm831x_dcdc_set_mode,

	.set_suspend_mode = wm831x_dcdc_set_suspend_mode,

};



static __devinit int wm831x_buckv_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->dcdc);

	struct wm831x_dcdc *dcdc;

	struct resource *res;

	int ret, irq;



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



	if (pdata == NULL || pdata->dcdc[id] == NULL)

		return -ENODEV;



	dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);

	if (dcdc == NULL) {

		dev_err(&pdev->dev, "Unable to allocate private data\n");

		return -ENOMEM;

	}



	dcdc->wm831x = wm831x;



	res = platform_get_resource(pdev, IORESOURCE_IO, 0);

	if (res == NULL) {

		dev_err(&pdev->dev, "No I/O resource\n");

		ret = -EINVAL;

		goto err;

	}

	dcdc->base = res->start;



	snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);

	dcdc->desc.name = dcdc->name;

	dcdc->desc.id = id;

	dcdc->desc.type = REGULATOR_VOLTAGE;

	dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;

	dcdc->desc.ops = &wm831x_buckv_ops;

	dcdc->desc.owner = THIS_MODULE;



	dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,

					     pdata->dcdc[id], dcdc);

	if (IS_ERR(dcdc->regulator)) {

		ret = PTR_ERR(dcdc->regulator);

		dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",

			id + 1, ret);

		goto err;

	}



	irq = platform_get_irq_byname(pdev, "UV");

	ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,

				 IRQF_TRIGGER_RISING, dcdc->name,

				 dcdc);

	if (ret != 0) {

		dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",

			irq, ret);

		goto err_regulator;

	}



	irq = platform_get_irq_byname(pdev, "HC");

	ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_oc_irq,

				 IRQF_TRIGGER_RISING, dcdc->name,

				 dcdc);

	if (ret != 0) {

		dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",

			irq, ret);

		goto err_uv;

	}



	platform_set_drvdata(pdev, dcdc);



	return 0;



err_uv:

	wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);

err_regulator:

	regulator_unregister(dcdc->regulator);

err:

	kfree(dcdc);

	return ret;

}



static __devexit int wm831x_buckv_remove(struct platform_device *pdev)

{

	struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);

	struct wm831x *wm831x = dcdc->wm831x;



	wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "HC"), dcdc);

	wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);

	regulator_unregister(dcdc->regulator);

	kfree(dcdc);



	return 0;

}



static struct platform_driver wm831x_buckv_driver = {

	.probe = wm831x_buckv_probe,

	.remove = __devexit_p(wm831x_buckv_remove),

	.driver		= {

		.name	= "wm831x-buckv",

	},

};



/*

 * BUCKP specifics

 */



static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,

				      unsigned selector)

{

	if (selector <= WM831X_BUCKP_MAX_SELECTOR)

		return 850000 + (selector * 25000);

	else

		return -EINVAL;

}



static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,

					int min_uV, int max_uV)

{

	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);

	struct wm831x *wm831x = dcdc->wm831x;

	u16 vsel;



	if (min_uV <= 34000000)

		vsel = (min_uV - 850000) / 25000;

	else

		return -EINVAL;



	if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)

		return -EINVAL;



	return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);

}



static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,

				    int min_uV, int max_uV)

{

	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);

	u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;



	return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV);

}



static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,

					    int uV)

{

	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);

	u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;



	return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV);

}



static int wm831x_buckp_get_voltage(struct regulator_dev *rdev)

{

	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);

	struct wm831x *wm831x = dcdc->wm831x;

	u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;

	int val;



	val = wm831x_reg_read(wm831x, reg);

	if (val < 0)

		return val;



	return wm831x_buckp_list_voltage(rdev, val & WM831X_DC3_ON_VSEL_MASK);

}



static struct regulator_ops wm831x_buckp_ops = {

	.set_voltage = wm831x_buckp_set_voltage,

	.get_voltage = wm831x_buckp_get_voltage,

	.list_voltage = wm831x_buckp_list_voltage,

	.set_suspend_voltage = wm831x_buckp_set_suspend_voltage,



	.is_enabled = wm831x_dcdc_is_enabled,

	.enable = wm831x_dcdc_enable,

	.disable = wm831x_dcdc_disable,

	.get_status = wm831x_dcdc_get_status,

	.get_mode = wm831x_dcdc_get_mode,

	.set_mode = wm831x_dcdc_set_mode,

	.set_suspend_mode = wm831x_dcdc_set_suspend_mode,

};



static __devinit int wm831x_buckp_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->dcdc);

	struct wm831x_dcdc *dcdc;

	struct resource *res;

	int ret, irq;



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



	if (pdata == NULL || pdata->dcdc[id] == NULL)

		return -ENODEV;



	dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);

	if (dcdc == NULL) {

		dev_err(&pdev->dev, "Unable to allocate private data\n");

		return -ENOMEM;

	}



	dcdc->wm831x = wm831x;



	res = platform_get_resource(pdev, IORESOURCE_IO, 0);

	if (res == NULL) {

		dev_err(&pdev->dev, "No I/O resource\n");

		ret = -EINVAL;

		goto err;

	}

	dcdc->base = res->start;



	snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);

	dcdc->desc.name = dcdc->name;

	dcdc->desc.id = id;

	dcdc->desc.type = REGULATOR_VOLTAGE;

	dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;

	dcdc->desc.ops = &wm831x_buckp_ops;

	dcdc->desc.owner = THIS_MODULE;



	dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,

					     pdata->dcdc[id], dcdc);

	if (IS_ERR(dcdc->regulator)) {

		ret = PTR_ERR(dcdc->regulator);

		dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",

			id + 1, ret);

		goto err;

	}



	irq = platform_get_irq_byname(pdev, "UV");

	ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,

				 IRQF_TRIGGER_RISING, dcdc->name,

				 dcdc);

	if (ret != 0) {

		dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",

			irq, ret);

		goto err_regulator;

	}



	platform_set_drvdata(pdev, dcdc);



	return 0;



err_regulator:

	regulator_unregister(dcdc->regulator);

err:

	kfree(dcdc);

	return ret;

}



static __devexit int wm831x_buckp_remove(struct platform_device *pdev)

{

	struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);

	struct wm831x *wm831x = dcdc->wm831x;



	wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);

	regulator_unregister(dcdc->regulator);

	kfree(dcdc);



	return 0;

}



static struct platform_driver wm831x_buckp_driver = {

	.probe = wm831x_buckp_probe,

	.remove = __devexit_p(wm831x_buckp_remove),

	.driver		= {

		.name	= "wm831x-buckp",

	},

};



static int __init wm831x_dcdc_init(void)

{

	int ret;

	ret = platform_driver_register(&wm831x_buckv_driver);

	if (ret != 0)

		pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);



	ret = platform_driver_register(&wm831x_buckp_driver);

	if (ret != 0)

		pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);



	return 0;

}

subsys_initcall(wm831x_dcdc_init);



static void __exit wm831x_dcdc_exit(void)

{

	platform_driver_unregister(&wm831x_buckp_driver);

	platform_driver_unregister(&wm831x_buckv_driver);

}

module_exit(wm831x_dcdc_exit);



/* Module information */

MODULE_AUTHOR("Mark Brown");

MODULE_DESCRIPTION("WM831x DC-DC convertor driver");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:wm831x-buckv");

MODULE_ALIAS("platform:wm831x-buckp");

include/linux/mfd/wm831x/regulator.h

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