[deliverable/linux.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 1600000 + ((selector - 14) * 100000);
}

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

	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);

		if ((val * 50000) + 900000 > max_uV)
			return -EINVAL;
		BUG_ON((val * 50000) + 900000 < min_uV);
	} else {
		/* Steps of 100mV from 1700mV */
		val = DIV_ROUND_UP(min_uV - 1700000, 100000);

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

		val += 0xf;
	}

	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 */
		ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
				      WM8400_DC1_ACTIVE, 0);
		if (ret != 0)
			return ret;
		return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
				       WM8400_DC1_SLEEP, 0);

	default:
		return -EINVAL;
	}
}

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

static struct regulator_ops wm8400_dcdc_ops = {
	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.list_voltage = regulator_list_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 = __devexit_p(wm8400_regulator_remove),
};

/**
 * wm8400_register_regulator - enable software control of a WM8400 regulator
 *
 * This function enables software control of a WM8400 regulator via
 * the regulator API.  It is intended to be called from the
 * platform_init() callback of the WM8400 MFD driver.
 *
 * @param dev      The WM8400 device to operate on.
 * @param reg      The regulator to control.
 * @param initdata Regulator initdata for the regulator.
 */
int wm8400_register_regulator(struct device *dev, int reg,
			      struct regulator_init_data *initdata)
{
	struct wm8400 *wm8400 = dev_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
	31	return 1600000 + ((selector - 14) * 100000);
	32	}
	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 MB	37	u16 val;
	38
	39	if (min_uV < 900000 \|\| min_uV > 3300000)
	40	return -EINVAL;
	41
	42	if (min_uV < 1700000) {
	43	/* Steps of 50mV from 900mV; */
e9a15c8c	44	val = DIV_ROUND_UP(min_uV - 900000, 50000);
42fad570 MB	45
	46	if ((val * 50000) + 900000 > max_uV)
	47	return -EINVAL;
	48	BUG_ON((val * 50000) + 900000 < min_uV);
	49	} else {
	50	/* Steps of 100mV from 1700mV */
e9a15c8c	51	val = DIV_ROUND_UP(min_uV - 1700000, 100000);
42fad570 MB	52
	53	if ((val * 100000) + 1700000 > max_uV)
	54	return -EINVAL;
	55	BUG_ON((val * 100000) + 1700000 < min_uV);
	56
	57	val += 0xf;
	58	}
	59
c54a155d	60	return val;
42fad570 MB	61	}
	62
	63	static struct regulator_ops wm8400_ldo_ops = {
c54a155d MB	64	.is_enabled = regulator_is_enabled_regmap,
	65	.enable = regulator_enable_regmap,
	66	.disable = regulator_disable_regmap,
216765d9	67	.list_voltage = wm8400_ldo_list_voltage,
c54a155d MB	68	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	69	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	70	.map_voltage = wm8400_ldo_map_voltage,
42fad570 MB	71	};
42fad570 MB	72
42fad570 MB	73	static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
	74	{
	75	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	76	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
	77	u16 data[2];
	78	int ret;
	79
	80	ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2,
	81	data);
	82	if (ret != 0)
	83	return 0;
	84
	85	/* Datasheet: hibernate */
	86	if (data[0] & WM8400_DC1_SLEEP)
	87	return REGULATOR_MODE_STANDBY;
	88
	89	/* Datasheet: standby */
	90	if (!(data[0] & WM8400_DC1_ACTIVE))
	91	return REGULATOR_MODE_IDLE;
	92
	93	/* Datasheet: active with or without force PWM */
	94	if (data[1] & WM8400_DC1_FRC_PWM)
	95	return REGULATOR_MODE_FAST;
	96	else
	97	return REGULATOR_MODE_NORMAL;
	98	}
	99
	100	static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
	101	{
	102	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	103	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
	104	int ret;
	105
	106	switch (mode) {
	107	case REGULATOR_MODE_FAST:
	108	/* Datasheet: active with force PWM */
	109	ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
	110	WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
	111	if (ret != 0)
	112	return ret;
	113
	114	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
	115	WM8400_DC1_ACTIVE \| WM8400_DC1_SLEEP,
	116	WM8400_DC1_ACTIVE);
	117
	118	case REGULATOR_MODE_NORMAL:
	119	/* Datasheet: active */
	120	ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
	121	WM8400_DC1_FRC_PWM, 0);
	122	if (ret != 0)
	123	return ret;
	124
	125	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
	126	WM8400_DC1_ACTIVE \| WM8400_DC1_SLEEP,
	127	WM8400_DC1_ACTIVE);
	128
	129	case REGULATOR_MODE_IDLE:
	130	/* Datasheet: standby */
	131	ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
	132	WM8400_DC1_ACTIVE, 0);
	133	if (ret != 0)
	134	return ret;
	135	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
	136	WM8400_DC1_SLEEP, 0);
137
138	default:
139	return -EINVAL;
140	}
141	}
142
143	static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
144	int input_uV, int output_uV,
145	int load_uA)
146	{
147	return REGULATOR_MODE_NORMAL;
148	}
149
150	static struct regulator_ops wm8400_dcdc_ops = {
c54a155d MB	151	.is_enabled = regulator_is_enabled_regmap,
	152	.enable = regulator_enable_regmap,
	153	.disable = regulator_disable_regmap,
	154	.list_voltage = regulator_list_voltage_linear,
	155	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	156	.set_voltage_sel = regulator_set_voltage_sel_regmap,
42fad570 MB	157	.get_mode = wm8400_dcdc_get_mode,
	158	.set_mode = wm8400_dcdc_set_mode,
	159	.get_optimum_mode = wm8400_dcdc_get_optimum_mode,
	160	};
	161
	162	static struct regulator_desc regulators[] = {
	163	{
	164	.name = "LDO1",
	165	.id = WM8400_LDO1,
	166	.ops = &wm8400_ldo_ops,
c54a155d MB	167	.enable_reg = WM8400_LDO1_CONTROL,
c54a155d MB	168	.enable_mask = WM8400_LDO1_ENA,
216765d9	169	.n_voltages = WM8400_LDO1_VSEL_MASK + 1,
c54a155d MB	170	.vsel_reg = WM8400_LDO1_CONTROL,
c54a155d MB	171	.vsel_mask = WM8400_LDO1_VSEL_MASK,
42fad570 MB	172	.type = REGULATOR_VOLTAGE,
	173	.owner = THIS_MODULE,
	174	},
	175	{
	176	.name = "LDO2",
	177	.id = WM8400_LDO2,
	178	.ops = &wm8400_ldo_ops,
c54a155d MB	179	.enable_reg = WM8400_LDO2_CONTROL,
c54a155d MB	180	.enable_mask = WM8400_LDO2_ENA,
216765d9	181	.n_voltages = WM8400_LDO2_VSEL_MASK + 1,
42fad570	182	.type = REGULATOR_VOLTAGE,
c54a155d MB	183	.vsel_reg = WM8400_LDO2_CONTROL,
c54a155d MB	184	.vsel_mask = WM8400_LDO2_VSEL_MASK,
42fad570 MB	185	.owner = THIS_MODULE,
	186	},
	187	{
	188	.name = "LDO3",
	189	.id = WM8400_LDO3,
	190	.ops = &wm8400_ldo_ops,
c54a155d MB	191	.enable_reg = WM8400_LDO3_CONTROL,
c54a155d MB	192	.enable_mask = WM8400_LDO3_ENA,
216765d9	193	.n_voltages = WM8400_LDO3_VSEL_MASK + 1,
c54a155d MB	194	.vsel_reg = WM8400_LDO3_CONTROL,
c54a155d MB	195	.vsel_mask = WM8400_LDO3_VSEL_MASK,
42fad570 MB	196	.type = REGULATOR_VOLTAGE,
	197	.owner = THIS_MODULE,
	198	},
	199	{
	200	.name = "LDO4",
	201	.id = WM8400_LDO4,
	202	.ops = &wm8400_ldo_ops,
c54a155d MB	203	.enable_reg = WM8400_LDO4_CONTROL,
c54a155d MB	204	.enable_mask = WM8400_LDO4_ENA,
216765d9	205	.n_voltages = WM8400_LDO4_VSEL_MASK + 1,
c54a155d MB	206	.vsel_reg = WM8400_LDO4_CONTROL,
c54a155d MB	207	.vsel_mask = WM8400_LDO4_VSEL_MASK,
42fad570 MB	208	.type = REGULATOR_VOLTAGE,
	209	.owner = THIS_MODULE,
	210	},
	211	{
	212	.name = "DCDC1",
	213	.id = WM8400_DCDC1,
	214	.ops = &wm8400_dcdc_ops,
c54a155d MB	215	.enable_reg = WM8400_DCDC1_CONTROL_1,
c54a155d MB	216	.enable_mask = WM8400_DC1_ENA_MASK,
216765d9	217	.n_voltages = WM8400_DC1_VSEL_MASK + 1,
c54a155d MB	218	.vsel_reg = WM8400_DCDC1_CONTROL_1,
	219	.vsel_mask = WM8400_DC1_VSEL_MASK,
	220	.min_uV = 850000,
	221	.uV_step = 25000,
42fad570 MB	222	.type = REGULATOR_VOLTAGE,
	223	.owner = THIS_MODULE,
	224	},
	225	{
	226	.name = "DCDC2",
	227	.id = WM8400_DCDC2,
	228	.ops = &wm8400_dcdc_ops,
c54a155d MB	229	.enable_reg = WM8400_DCDC2_CONTROL_1,
c54a155d MB	230	.enable_mask = WM8400_DC1_ENA_MASK,
216765d9	231	.n_voltages = WM8400_DC2_VSEL_MASK + 1,
c54a155d MB	232	.vsel_reg = WM8400_DCDC2_CONTROL_1,
	233	.vsel_mask = WM8400_DC2_VSEL_MASK,
	234	.min_uV = 850000,
	235	.uV_step = 25000,
42fad570 MB	236	.type = REGULATOR_VOLTAGE,
	237	.owner = THIS_MODULE,
	238	},
	239	};
	240
5dbdf735	241	static int __devinit wm8400_regulator_probe(struct platform_device *pdev)
42fad570	242	{
1ad02bbc	243	struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]);
c172708d	244	struct regulator_config config = { };
42fad570 MB	245	struct regulator_dev *rdev;
42fad570 MB	246
c172708d MB	247	config.dev = &pdev->dev;
	248	config.init_data = pdev->dev.platform_data;
	249	config.driver_data = wm8400;
c54a155d	250	config.regmap = wm8400->regmap;
42fad570	251
c172708d	252	rdev = regulator_register(&regulators[pdev->id], &config);
42fad570 MB	253	if (IS_ERR(rdev))
	254	return PTR_ERR(rdev);
	255
1ad02bbc DT	256	platform_set_drvdata(pdev, rdev);
1ad02bbc DT	257
42fad570 MB	258	return 0;
	259	}
	260
	261	static int __devexit wm8400_regulator_remove(struct platform_device *pdev)
	262	{
	263	struct regulator_dev *rdev = platform_get_drvdata(pdev);
	264
1ad02bbc	265	platform_set_drvdata(pdev, NULL);
42fad570 MB	266	regulator_unregister(rdev);
	267
	268	return 0;
	269	}
	270
	271	static struct platform_driver wm8400_regulator_driver = {
	272	.driver = {
	273	.name = "wm8400-regulator",
	274	},
	275	.probe = wm8400_regulator_probe,
	276	.remove = __devexit_p(wm8400_regulator_remove),
	277	};
	278
	279	/**
	280	* wm8400_register_regulator - enable software control of a WM8400 regulator
	281	*
	282	* This function enables software control of a WM8400 regulator via
	283	* the regulator API. It is intended to be called from the
	284	* platform_init() callback of the WM8400 MFD driver.
	285	*
	286	* @param dev The WM8400 device to operate on.
	287	* @param reg The regulator to control.
	288	* @param initdata Regulator initdata for the regulator.
	289	*/
	290	int wm8400_register_regulator(struct device *dev, int reg,
	291	struct regulator_init_data *initdata)
	292	{
1909e2f6	293	struct wm8400 *wm8400 = dev_get_drvdata(dev);
42fad570 MB	294
	295	if (wm8400->regulators[reg].name)
	296	return -EBUSY;
	297
	298	initdata->driver_data = wm8400;
	299
	300	wm8400->regulators[reg].name = "wm8400-regulator";
	301	wm8400->regulators[reg].id = reg;
	302	wm8400->regulators[reg].dev.parent = dev;
42fad570 MB	303	wm8400->regulators[reg].dev.platform_data = initdata;
	304
	305	return platform_device_register(&wm8400->regulators[reg]);
	306	}
	307	EXPORT_SYMBOL_GPL(wm8400_register_regulator);
	308
	309	static int __init wm8400_regulator_init(void)
	310	{
	311	return platform_driver_register(&wm8400_regulator_driver);
	312	}
5a1b22be	313	subsys_initcall(wm8400_regulator_init);
42fad570 MB	314
	315	static void __exit wm8400_regulator_exit(void)
	316	{
	317	platform_driver_unregister(&wm8400_regulator_driver);
	318	}
	319	module_exit(wm8400_regulator_exit);
	320
	321	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	322	MODULE_DESCRIPTION("WM8400 regulator driver");
	323	MODULE_LICENSE("GPL");
	324	MODULE_ALIAS("platform:wm8400-regulator");