[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / regulator / wm8400-regulator.c

/*
 * 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/module.h>
#include <linux/regulator/driver.h>
#include <linux/mfd/wm8400-private.h>

static int wm8400_ldo_list_voltage(struct regulator_dev *dev,
				   unsigned selector)
{
	if (selector > WM8400_LDO1_VSEL_MASK)
		return -EINVAL;

	if (selector < 15)
		return 900000 + (selector * 50000);
	else
		return 1700000 + ((selector - 15) * 100000);
}

static int wm8400_ldo_map_voltage(struct regulator_dev *dev,
				  int min_uV, int max_uV)
{
	u16 val;
	int volt;

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

	if (min_uV < 1700000) /* Steps of 50mV from 900mV;  */
		val = DIV_ROUND_UP(min_uV - 900000, 50000);
	else /* Steps of 100mV from 1700mV */
		val = DIV_ROUND_UP(min_uV - 1700000, 100000) + 15;

	volt = wm8400_ldo_list_voltage(dev, val);
	if (volt < min_uV || volt > max_uV)
		return -EINVAL;

	return val;
}

static struct regulator_ops wm8400_ldo_ops = {
	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.list_voltage = wm8400_ldo_list_voltage,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.map_voltage = wm8400_ldo_map_voltage,
};

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 */
		return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
				       WM8400_DC1_ACTIVE | 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 = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.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,
	.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,
		.enable_reg = WM8400_LDO1_CONTROL,
		.enable_mask = WM8400_LDO1_ENA,
		.n_voltages = WM8400_LDO1_VSEL_MASK + 1,
		.vsel_reg = WM8400_LDO1_CONTROL,
		.vsel_mask = WM8400_LDO1_VSEL_MASK,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "LDO2",
		.id = WM8400_LDO2,
		.ops = &wm8400_ldo_ops,
		.enable_reg = WM8400_LDO2_CONTROL,
		.enable_mask = WM8400_LDO2_ENA,
		.n_voltages = WM8400_LDO2_VSEL_MASK + 1,
		.type = REGULATOR_VOLTAGE,
		.vsel_reg = WM8400_LDO2_CONTROL,
		.vsel_mask = WM8400_LDO2_VSEL_MASK,
		.owner = THIS_MODULE,
	},
	{
		.name = "LDO3",
		.id = WM8400_LDO3,
		.ops = &wm8400_ldo_ops,
		.enable_reg = WM8400_LDO3_CONTROL,
		.enable_mask = WM8400_LDO3_ENA,
		.n_voltages = WM8400_LDO3_VSEL_MASK + 1,
		.vsel_reg = WM8400_LDO3_CONTROL,
		.vsel_mask = WM8400_LDO3_VSEL_MASK,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "LDO4",
		.id = WM8400_LDO4,
		.ops = &wm8400_ldo_ops,
		.enable_reg = WM8400_LDO4_CONTROL,
		.enable_mask = WM8400_LDO4_ENA,
		.n_voltages = WM8400_LDO4_VSEL_MASK + 1,
		.vsel_reg = WM8400_LDO4_CONTROL,
		.vsel_mask = WM8400_LDO4_VSEL_MASK,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "DCDC1",
		.id = WM8400_DCDC1,
		.ops = &wm8400_dcdc_ops,
		.enable_reg = WM8400_DCDC1_CONTROL_1,
		.enable_mask = WM8400_DC1_ENA_MASK,
		.n_voltages = WM8400_DC1_VSEL_MASK + 1,
		.vsel_reg = WM8400_DCDC1_CONTROL_1,
		.vsel_mask = WM8400_DC1_VSEL_MASK,
		.min_uV = 850000,
		.uV_step = 25000,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "DCDC2",
		.id = WM8400_DCDC2,
		.ops = &wm8400_dcdc_ops,
		.enable_reg = WM8400_DCDC2_CONTROL_1,
		.enable_mask = WM8400_DC1_ENA_MASK,
		.n_voltages = WM8400_DC2_VSEL_MASK + 1,
		.vsel_reg = WM8400_DCDC2_CONTROL_1,
		.vsel_mask = WM8400_DC2_VSEL_MASK,
		.min_uV = 850000,
		.uV_step = 25000,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
};

static int __devinit wm8400_regulator_probe(struct platform_device *pdev)
{
	struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]);
	struct regulator_config config = { };
	struct regulator_dev *rdev;

	config.dev = &pdev->dev;
	config.init_data = pdev->dev.platform_data;
	config.driver_data = wm8400;
	config.regmap = wm8400->regmap;

	rdev = regulator_register(&regulators[pdev->id], &config);
	if (IS_ERR(rdev))
		return PTR_ERR(rdev);

	platform_set_drvdata(pdev, rdev);

	return 0;
}

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

	platform_set_drvdata(pdev, NULL);
	regulator_unregister(rdev);

	return 0;
}

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

	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.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);
}
subsys_initcall(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");
Commit	Line	Data
42fad570 MB	1	/*
	2	* Regulator support for WM8400
	3	*
	4	* Copyright 2008 Wolfson Microelectronics PLC.
	5	*
	6	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License as
	10	* published by the Free Software Foundation; either version 2 of the
	11	* License, or (at your option) any later version.
	12	*
	13	*/
	14
	15	#include <linux/bug.h>
	16	#include <linux/err.h>
	17	#include <linux/kernel.h>
65602c32	18	#include <linux/module.h>
42fad570 MB	19	#include <linux/regulator/driver.h>
	20	#include <linux/mfd/wm8400-private.h>
	21
216765d9 MB	22	static int wm8400_ldo_list_voltage(struct regulator_dev *dev,
	23	unsigned selector)
	24	{
	25	if (selector > WM8400_LDO1_VSEL_MASK)
	26	return -EINVAL;
	27
	28	if (selector < 15)
	29	return 900000 + (selector * 50000);
	30	else
74e20e56	31	return 1700000 + ((selector - 15) * 100000);
216765d9 MB	32	}
216765d9 MB	33
c54a155d MB	34	static int wm8400_ldo_map_voltage(struct regulator_dev *dev,
c54a155d MB	35	int min_uV, int max_uV)
42fad570	36	{
42fad570	37	u16 val;
38c20eb2	38	int volt;
42fad570 MB	39
	40	if (min_uV < 900000 \|\| min_uV > 3300000)
	41	return -EINVAL;
	42
38c20eb2	43	if (min_uV < 1700000) /* Steps of 50mV from 900mV; */
e9a15c8c	44	val = DIV_ROUND_UP(min_uV - 900000, 50000);
38c20eb2 AL	45	else /* Steps of 100mV from 1700mV */
38c20eb2 AL	46	val = DIV_ROUND_UP(min_uV - 1700000, 100000) + 15;
42fad570	47
38c20eb2 AL	48	volt = wm8400_ldo_list_voltage(dev, val);
	49	if (volt < min_uV \|\| volt > max_uV)
	50	return -EINVAL;
42fad570	51
c54a155d	52	return val;
42fad570 MB	53	}
	54
	55	static struct regulator_ops wm8400_ldo_ops = {
c54a155d MB	56	.is_enabled = regulator_is_enabled_regmap,
	57	.enable = regulator_enable_regmap,
	58	.disable = regulator_disable_regmap,
216765d9	59	.list_voltage = wm8400_ldo_list_voltage,
c54a155d MB	60	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	61	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	62	.map_voltage = wm8400_ldo_map_voltage,
42fad570 MB	63	};
42fad570 MB	64
42fad570 MB	65	static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
	66	{
	67	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	68	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
	69	u16 data[2];
	70	int ret;
	71
	72	ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2,
	73	data);
	74	if (ret != 0)
	75	return 0;
	76
	77	/* Datasheet: hibernate */
	78	if (data[0] & WM8400_DC1_SLEEP)
	79	return REGULATOR_MODE_STANDBY;
	80
	81	/* Datasheet: standby */
	82	if (!(data[0] & WM8400_DC1_ACTIVE))
	83	return REGULATOR_MODE_IDLE;
	84
	85	/* Datasheet: active with or without force PWM */
	86	if (data[1] & WM8400_DC1_FRC_PWM)
	87	return REGULATOR_MODE_FAST;
	88	else
	89	return REGULATOR_MODE_NORMAL;
	90	}
	91
	92	static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
	93	{
	94	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	95	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
	96	int ret;
	97
	98	switch (mode) {
	99	case REGULATOR_MODE_FAST:
	100	/* Datasheet: active with force PWM */
	101	ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
	102	WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
	103	if (ret != 0)
	104	return ret;
	105
	106	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
	107	WM8400_DC1_ACTIVE \| WM8400_DC1_SLEEP,
	108	WM8400_DC1_ACTIVE);
	109
	110	case REGULATOR_MODE_NORMAL:
	111	/* Datasheet: active */
	112	ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
	113	WM8400_DC1_FRC_PWM, 0);
	114	if (ret != 0)
	115	return ret;
	116
	117	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
	118	WM8400_DC1_ACTIVE \| WM8400_DC1_SLEEP,
	119	WM8400_DC1_ACTIVE);
	120
	121	case REGULATOR_MODE_IDLE:
	122	/* Datasheet: standby */
42fad570	123	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
4001376e	124	WM8400_DC1_ACTIVE \| WM8400_DC1_SLEEP, 0);
42fad570 MB	125	default:
	126	return -EINVAL;
	127	}
	128	}
	129
	130	static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
	131	int input_uV, int output_uV,
	132	int load_uA)
	133	{
	134	return REGULATOR_MODE_NORMAL;
	135	}
	136
	137	static struct regulator_ops wm8400_dcdc_ops = {
c54a155d MB	138	.is_enabled = regulator_is_enabled_regmap,
	139	.enable = regulator_enable_regmap,
	140	.disable = regulator_disable_regmap,
	141	.list_voltage = regulator_list_voltage_linear,
27eeabb7	142	.map_voltage = regulator_map_voltage_linear,
c54a155d MB	143	.get_voltage_sel = regulator_get_voltage_sel_regmap,
c54a155d MB	144	.set_voltage_sel = regulator_set_voltage_sel_regmap,
42fad570 MB	145	.get_mode = wm8400_dcdc_get_mode,
	146	.set_mode = wm8400_dcdc_set_mode,
	147	.get_optimum_mode = wm8400_dcdc_get_optimum_mode,
	148	};
	149
	150	static struct regulator_desc regulators[] = {
	151	{
	152	.name = "LDO1",
	153	.id = WM8400_LDO1,
	154	.ops = &wm8400_ldo_ops,
c54a155d MB	155	.enable_reg = WM8400_LDO1_CONTROL,
c54a155d MB	156	.enable_mask = WM8400_LDO1_ENA,
216765d9	157	.n_voltages = WM8400_LDO1_VSEL_MASK + 1,
c54a155d MB	158	.vsel_reg = WM8400_LDO1_CONTROL,
c54a155d MB	159	.vsel_mask = WM8400_LDO1_VSEL_MASK,
42fad570 MB	160	.type = REGULATOR_VOLTAGE,
	161	.owner = THIS_MODULE,
	162	},
	163	{
	164	.name = "LDO2",
	165	.id = WM8400_LDO2,
	166	.ops = &wm8400_ldo_ops,
c54a155d MB	167	.enable_reg = WM8400_LDO2_CONTROL,
c54a155d MB	168	.enable_mask = WM8400_LDO2_ENA,
216765d9	169	.n_voltages = WM8400_LDO2_VSEL_MASK + 1,
42fad570	170	.type = REGULATOR_VOLTAGE,
c54a155d MB	171	.vsel_reg = WM8400_LDO2_CONTROL,
c54a155d MB	172	.vsel_mask = WM8400_LDO2_VSEL_MASK,
42fad570 MB	173	.owner = THIS_MODULE,
	174	},
	175	{
	176	.name = "LDO3",
	177	.id = WM8400_LDO3,
	178	.ops = &wm8400_ldo_ops,
c54a155d MB	179	.enable_reg = WM8400_LDO3_CONTROL,
c54a155d MB	180	.enable_mask = WM8400_LDO3_ENA,
216765d9	181	.n_voltages = WM8400_LDO3_VSEL_MASK + 1,
c54a155d MB	182	.vsel_reg = WM8400_LDO3_CONTROL,
c54a155d MB	183	.vsel_mask = WM8400_LDO3_VSEL_MASK,
42fad570 MB	184	.type = REGULATOR_VOLTAGE,
	185	.owner = THIS_MODULE,
	186	},
	187	{
	188	.name = "LDO4",
	189	.id = WM8400_LDO4,
	190	.ops = &wm8400_ldo_ops,
c54a155d MB	191	.enable_reg = WM8400_LDO4_CONTROL,
c54a155d MB	192	.enable_mask = WM8400_LDO4_ENA,
216765d9	193	.n_voltages = WM8400_LDO4_VSEL_MASK + 1,
c54a155d MB	194	.vsel_reg = WM8400_LDO4_CONTROL,
c54a155d MB	195	.vsel_mask = WM8400_LDO4_VSEL_MASK,
42fad570 MB	196	.type = REGULATOR_VOLTAGE,
	197	.owner = THIS_MODULE,
	198	},
	199	{
	200	.name = "DCDC1",
	201	.id = WM8400_DCDC1,
	202	.ops = &wm8400_dcdc_ops,
c54a155d MB	203	.enable_reg = WM8400_DCDC1_CONTROL_1,
c54a155d MB	204	.enable_mask = WM8400_DC1_ENA_MASK,
216765d9	205	.n_voltages = WM8400_DC1_VSEL_MASK + 1,
c54a155d MB	206	.vsel_reg = WM8400_DCDC1_CONTROL_1,
	207	.vsel_mask = WM8400_DC1_VSEL_MASK,
	208	.min_uV = 850000,
	209	.uV_step = 25000,
42fad570 MB	210	.type = REGULATOR_VOLTAGE,
	211	.owner = THIS_MODULE,
	212	},
	213	{
	214	.name = "DCDC2",
	215	.id = WM8400_DCDC2,
	216	.ops = &wm8400_dcdc_ops,
c54a155d MB	217	.enable_reg = WM8400_DCDC2_CONTROL_1,
c54a155d MB	218	.enable_mask = WM8400_DC1_ENA_MASK,
216765d9	219	.n_voltages = WM8400_DC2_VSEL_MASK + 1,
c54a155d MB	220	.vsel_reg = WM8400_DCDC2_CONTROL_1,
	221	.vsel_mask = WM8400_DC2_VSEL_MASK,
	222	.min_uV = 850000,
	223	.uV_step = 25000,
42fad570 MB	224	.type = REGULATOR_VOLTAGE,
	225	.owner = THIS_MODULE,
	226	},
	227	};
	228
5dbdf735	229	static int __devinit wm8400_regulator_probe(struct platform_device *pdev)
42fad570	230	{
1ad02bbc	231	struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]);
c172708d	232	struct regulator_config config = { };
42fad570 MB	233	struct regulator_dev *rdev;
42fad570 MB	234
c172708d MB	235	config.dev = &pdev->dev;
	236	config.init_data = pdev->dev.platform_data;
	237	config.driver_data = wm8400;
c54a155d	238	config.regmap = wm8400->regmap;
42fad570	239
c172708d	240	rdev = regulator_register(&regulators[pdev->id], &config);
42fad570 MB	241	if (IS_ERR(rdev))
	242	return PTR_ERR(rdev);
	243
1ad02bbc DT	244	platform_set_drvdata(pdev, rdev);
1ad02bbc DT	245
42fad570 MB	246	return 0;
	247	}
	248
	249	static int __devexit wm8400_regulator_remove(struct platform_device *pdev)
	250	{
	251	struct regulator_dev *rdev = platform_get_drvdata(pdev);
	252
1ad02bbc	253	platform_set_drvdata(pdev, NULL);
42fad570 MB	254	regulator_unregister(rdev);
	255
	256	return 0;
	257	}
	258
	259	static struct platform_driver wm8400_regulator_driver = {
	260	.driver = {
	261	.name = "wm8400-regulator",
	262	},
	263	.probe = wm8400_regulator_probe,
5eb9f2b9	264	.remove = wm8400_regulator_remove,
42fad570 MB	265	};
	266
	267	/**
	268	* wm8400_register_regulator - enable software control of a WM8400 regulator
	269	*
	270	* This function enables software control of a WM8400 regulator via
	271	* the regulator API. It is intended to be called from the
	272	* platform_init() callback of the WM8400 MFD driver.
	273	*
	274	* @param dev The WM8400 device to operate on.
	275	* @param reg The regulator to control.
	276	* @param initdata Regulator initdata for the regulator.
	277	*/
	278	int wm8400_register_regulator(struct device *dev, int reg,
	279	struct regulator_init_data *initdata)
	280	{
1909e2f6	281	struct wm8400 *wm8400 = dev_get_drvdata(dev);
42fad570 MB	282
	283	if (wm8400->regulators[reg].name)
	284	return -EBUSY;
	285
	286	initdata->driver_data = wm8400;
	287
	288	wm8400->regulators[reg].name = "wm8400-regulator";
	289	wm8400->regulators[reg].id = reg;
	290	wm8400->regulators[reg].dev.parent = dev;
42fad570 MB	291	wm8400->regulators[reg].dev.platform_data = initdata;
	292
	293	return platform_device_register(&wm8400->regulators[reg]);
	294	}
	295	EXPORT_SYMBOL_GPL(wm8400_register_regulator);
	296
	297	static int __init wm8400_regulator_init(void)
	298	{
	299	return platform_driver_register(&wm8400_regulator_driver);
	300	}
5a1b22be	301	subsys_initcall(wm8400_regulator_init);
42fad570 MB	302
	303	static void __exit wm8400_regulator_exit(void)
	304	{
	305	platform_driver_unregister(&wm8400_regulator_driver);
	306	}
	307	module_exit(wm8400_regulator_exit);
	308
	309	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	310	MODULE_DESCRIPTION("WM8400 regulator driver");
	311	MODULE_LICENSE("GPL");
	312	MODULE_ALIAS("platform:wm8400-regulator");