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

static int wm8400_ldo_is_enabled(struct regulator_dev *dev)
{
	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	u16 val;

	val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev));
	return (val & WM8400_LDO1_ENA) != 0;
}

static int wm8400_ldo_enable(struct regulator_dev *dev)
{
	struct wm8400 *wm8400 = rdev_get_drvdata(dev);

	return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
			       WM8400_LDO1_ENA, WM8400_LDO1_ENA);
}

static int wm8400_ldo_disable(struct regulator_dev *dev)
{
	struct wm8400 *wm8400 = rdev_get_drvdata(dev);

	return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
			       WM8400_LDO1_ENA, 0);
}

static int wm8400_ldo_get_voltage(struct regulator_dev *dev)
{
	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	u16 val;

	val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev));
	val &= WM8400_LDO1_VSEL_MASK;

	if (val < 15)
		return 900000 + (val * 50000);
	else
		return 1600000 + ((val - 14) * 100000);
}

static int wm8400_ldo_set_voltage(struct regulator_dev *dev,
				  int min_uV, int max_uV)
{
	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	u16 val;

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

	if (min_uV < 1700000) {
		/* Steps of 50mV from 900mV;  */
		val = (min_uV - 850001) / 50000;

		if ((val * 50000) + 900000 > max_uV)
			return -EINVAL;
		BUG_ON((val * 50000) + 900000 < min_uV);
	} else {
		/* Steps of 100mV from 1700mV */
		val = ((min_uV - 1600001) / 100000);

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

		val += 0xf;
	}

	return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
			       WM8400_LDO1_VSEL_MASK, val);
}

static struct regulator_ops wm8400_ldo_ops = {
	.is_enabled = wm8400_ldo_is_enabled,
	.enable = wm8400_ldo_enable,
	.disable = wm8400_ldo_disable,
	.get_voltage = wm8400_ldo_get_voltage,
	.set_voltage = wm8400_ldo_set_voltage,
};

static int wm8400_dcdc_is_enabled(struct regulator_dev *dev)
{
	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
	u16 val;

	val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
	return (val & WM8400_DC1_ENA) != 0;
}

static int wm8400_dcdc_enable(struct regulator_dev *dev)
{
	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;

	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
			       WM8400_DC1_ENA, WM8400_DC1_ENA);
}

static int wm8400_dcdc_disable(struct regulator_dev *dev)
{
	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;

	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
			       WM8400_DC1_ENA, 0);
}

static int wm8400_dcdc_get_voltage(struct regulator_dev *dev)
{
	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	u16 val;
	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;

	val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
	val &= WM8400_DC1_VSEL_MASK;

	return 850000 + (25000 * val);
}

static int wm8400_dcdc_set_voltage(struct regulator_dev *dev,
				  int min_uV, int max_uV)
{
	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	u16 val;
	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;

	if (min_uV < 850000)
		return -EINVAL;

	val = (min_uV - 825001) / 25000;

	if (850000 + (25000 * val) > max_uV)
		return -EINVAL;
	BUG_ON(850000 + (25000 * val) < min_uV);

	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
			       WM8400_DC1_VSEL_MASK, val);
}

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 = wm8400_dcdc_is_enabled,
	.enable = wm8400_dcdc_enable,
	.disable = wm8400_dcdc_disable,
	.get_voltage = wm8400_dcdc_get_voltage,
	.set_voltage = wm8400_dcdc_set_voltage,
	.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,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "LDO2",
		.id = WM8400_LDO2,
		.ops = &wm8400_ldo_ops,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "LDO3",
		.id = WM8400_LDO3,
		.ops = &wm8400_ldo_ops,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "LDO4",
		.id = WM8400_LDO4,
		.ops = &wm8400_ldo_ops,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "DCDC1",
		.id = WM8400_DCDC1,
		.ops = &wm8400_dcdc_ops,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "DCDC2",
		.id = WM8400_DCDC2,
		.ops = &wm8400_dcdc_ops,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
};

static int __init wm8400_regulator_probe(struct platform_device *pdev)
{
	struct regulator_dev *rdev;

	rdev = regulator_register(&regulators[pdev->id], &pdev->dev,
		pdev->dev.driver_data);

	if (IS_ERR(rdev))
		return PTR_ERR(rdev);

	return 0;
}

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

	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->driver_data;

	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.driver_data = wm8400;
	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);
}
module_init(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>
	18	#include <linux/regulator/driver.h>
	19	#include <linux/mfd/wm8400-private.h>
	20
	21	static int wm8400_ldo_is_enabled(struct regulator_dev *dev)
	22	{
	23	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	24	u16 val;
	25
	26	val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev));
	27	return (val & WM8400_LDO1_ENA) != 0;
	28	}
	29
	30	static int wm8400_ldo_enable(struct regulator_dev *dev)
	31	{
	32	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	33
	34	return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
	35	WM8400_LDO1_ENA, WM8400_LDO1_ENA);
	36	}
	37
	38	static int wm8400_ldo_disable(struct regulator_dev *dev)
	39	{
	40	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	41
	42	return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
	43	WM8400_LDO1_ENA, 0);
	44	}
	45
	46	static int wm8400_ldo_get_voltage(struct regulator_dev *dev)
	47	{
	48	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	49	u16 val;
	50
	51	val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev));
	52	val &= WM8400_LDO1_VSEL_MASK;
	53
	54	if (val < 15)
	55	return 900000 + (val * 50000);
	56	else
	57	return 1600000 + ((val - 14) * 100000);
	58	}
	59
	60	static int wm8400_ldo_set_voltage(struct regulator_dev *dev,
	61	int min_uV, int max_uV)
	62	{
	63	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
	64	u16 val;
65
66	if (min_uV < 900000 \|\| min_uV > 3300000)
67	return -EINVAL;
68
69	if (min_uV < 1700000) {
70	/* Steps of 50mV from 900mV; */
71	val = (min_uV - 850001) / 50000;
72
73	if ((val * 50000) + 900000 > max_uV)
74	return -EINVAL;
75	BUG_ON((val * 50000) + 900000 < min_uV);
76	} else {
77	/* Steps of 100mV from 1700mV */
78	val = ((min_uV - 1600001) / 100000);
79
80	if ((val * 100000) + 1700000 > max_uV)
81	return -EINVAL;
82	BUG_ON((val * 100000) + 1700000 < min_uV);
83
84	val += 0xf;
85	}
86
87	return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
88	WM8400_LDO1_VSEL_MASK, val);
89	}
90
91	static struct regulator_ops wm8400_ldo_ops = {
92	.is_enabled = wm8400_ldo_is_enabled,
93	.enable = wm8400_ldo_enable,
94	.disable = wm8400_ldo_disable,
95	.get_voltage = wm8400_ldo_get_voltage,
96	.set_voltage = wm8400_ldo_set_voltage,
97	};
98
99	static int wm8400_dcdc_is_enabled(struct regulator_dev *dev)
100	{
101	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
102	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
103	u16 val;
104
105	val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
106	return (val & WM8400_DC1_ENA) != 0;
107	}
108
109	static int wm8400_dcdc_enable(struct regulator_dev *dev)
110	{
111	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
112	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
113
114	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
115	WM8400_DC1_ENA, WM8400_DC1_ENA);
116	}
117
118	static int wm8400_dcdc_disable(struct regulator_dev *dev)
119	{
120	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
121	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
122
123	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
124	WM8400_DC1_ENA, 0);
125	}
126
127	static int wm8400_dcdc_get_voltage(struct regulator_dev *dev)
128	{
129	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
130	u16 val;
131	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
132
133	val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
134	val &= WM8400_DC1_VSEL_MASK;
135
136	return 850000 + (25000 * val);
137	}
138
139	static int wm8400_dcdc_set_voltage(struct regulator_dev *dev,
140	int min_uV, int max_uV)
141	{
142	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
143	u16 val;
144	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
145
146	if (min_uV < 850000)
147	return -EINVAL;
148
149	val = (min_uV - 825001) / 25000;
150
151	if (850000 + (25000 * val) > max_uV)
152	return -EINVAL;
153	BUG_ON(850000 + (25000 * val) < min_uV);
154
155	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
156	WM8400_DC1_VSEL_MASK, val);
157	}
158
159	static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
160	{
161	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
162	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
163	u16 data[2];
164	int ret;
165
166	ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2,
167	data);
168	if (ret != 0)
169	return 0;
170
171	/* Datasheet: hibernate */
172	if (data[0] & WM8400_DC1_SLEEP)
173	return REGULATOR_MODE_STANDBY;
174
175	/* Datasheet: standby */
176	if (!(data[0] & WM8400_DC1_ACTIVE))
177	return REGULATOR_MODE_IDLE;
178
179	/* Datasheet: active with or without force PWM */
180	if (data[1] & WM8400_DC1_FRC_PWM)
181	return REGULATOR_MODE_FAST;
182	else
183	return REGULATOR_MODE_NORMAL;
184	}
185
186	static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
187	{
188	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
189	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
190	int ret;
191
192	switch (mode) {
193	case REGULATOR_MODE_FAST:
194	/* Datasheet: active with force PWM */
195	ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
196	WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
197	if (ret != 0)
198	return ret;
199
200	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
201	WM8400_DC1_ACTIVE \| WM8400_DC1_SLEEP,
202	WM8400_DC1_ACTIVE);
203
204	case REGULATOR_MODE_NORMAL:
205	/* Datasheet: active */
206	ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
207	WM8400_DC1_FRC_PWM, 0);
208	if (ret != 0)
209	return ret;
210
211	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
212	WM8400_DC1_ACTIVE \| WM8400_DC1_SLEEP,
213	WM8400_DC1_ACTIVE);
214
215	case REGULATOR_MODE_IDLE:
216	/* Datasheet: standby */
217	ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
218	WM8400_DC1_ACTIVE, 0);
219	if (ret != 0)
220	return ret;
221	return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
222	WM8400_DC1_SLEEP, 0);
223
224	default:
225	return -EINVAL;
226	}
227	}
228
229	static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
230	int input_uV, int output_uV,
231	int load_uA)
232	{
233	return REGULATOR_MODE_NORMAL;
234	}
235
236	static struct regulator_ops wm8400_dcdc_ops = {
237	.is_enabled = wm8400_dcdc_is_enabled,
238	.enable = wm8400_dcdc_enable,
239	.disable = wm8400_dcdc_disable,
240	.get_voltage = wm8400_dcdc_get_voltage,
241	.set_voltage = wm8400_dcdc_set_voltage,
242	.get_mode = wm8400_dcdc_get_mode,
243	.set_mode = wm8400_dcdc_set_mode,
244	.get_optimum_mode = wm8400_dcdc_get_optimum_mode,
245	};
246
247	static struct regulator_desc regulators[] = {
248	{
249	.name = "LDO1",
250	.id = WM8400_LDO1,
251	.ops = &wm8400_ldo_ops,
252	.type = REGULATOR_VOLTAGE,
253	.owner = THIS_MODULE,
254	},
255	{
256	.name = "LDO2",
257	.id = WM8400_LDO2,
258	.ops = &wm8400_ldo_ops,
259	.type = REGULATOR_VOLTAGE,
260	.owner = THIS_MODULE,
261	},
262	{
263	.name = "LDO3",
264	.id = WM8400_LDO3,
265	.ops = &wm8400_ldo_ops,
266	.type = REGULATOR_VOLTAGE,
267	.owner = THIS_MODULE,
268	},
269	{
270	.name = "LDO4",
271	.id = WM8400_LDO4,
272	.ops = &wm8400_ldo_ops,
273	.type = REGULATOR_VOLTAGE,
274	.owner = THIS_MODULE,
275	},
276	{
277	.name = "DCDC1",
278	.id = WM8400_DCDC1,
279	.ops = &wm8400_dcdc_ops,
280	.type = REGULATOR_VOLTAGE,
281	.owner = THIS_MODULE,
282	},
283	{
284	.name = "DCDC2",
285	.id = WM8400_DCDC2,
286	.ops = &wm8400_dcdc_ops,
287	.type = REGULATOR_VOLTAGE,
288	.owner = THIS_MODULE,
289	},
290	};
291
292	static int __init wm8400_regulator_probe(struct platform_device *pdev)
293	{
294	struct regulator_dev *rdev;
295
296	rdev = regulator_register(&regulators[pdev->id], &pdev->dev,
297	pdev->dev.driver_data);
298
299	if (IS_ERR(rdev))
300	return PTR_ERR(rdev);
301
302	return 0;
303	}
304
305	static int __devexit wm8400_regulator_remove(struct platform_device *pdev)
306	{
307	struct regulator_dev *rdev = platform_get_drvdata(pdev);
308
309	regulator_unregister(rdev);
310
311	return 0;
312	}
313
314	static struct platform_driver wm8400_regulator_driver = {
315	.driver = {
316	.name = "wm8400-regulator",
317	},
318	.probe = wm8400_regulator_probe,
319	.remove = __devexit_p(wm8400_regulator_remove),
320	};
321
322	/**
323	* wm8400_register_regulator - enable software control of a WM8400 regulator
324	*
325	* This function enables software control of a WM8400 regulator via
326	* the regulator API. It is intended to be called from the
327	* platform_init() callback of the WM8400 MFD driver.
328	*
329	* @param dev The WM8400 device to operate on.
330	* @param reg The regulator to control.
331	* @param initdata Regulator initdata for the regulator.
332	*/
333	int wm8400_register_regulator(struct device *dev, int reg,
334	struct regulator_init_data *initdata)
335	{
336	struct wm8400 *wm8400 = dev->driver_data;
337
338	if (wm8400->regulators[reg].name)
339	return -EBUSY;
340
341	initdata->driver_data = wm8400;
342
343	wm8400->regulators[reg].name = "wm8400-regulator";
344	wm8400->regulators[reg].id = reg;
345	wm8400->regulators[reg].dev.parent = dev;
346	wm8400->regulators[reg].dev.driver_data = wm8400;
347	wm8400->regulators[reg].dev.platform_data = initdata;
348
349	return platform_device_register(&wm8400->regulators[reg]);
350	}
351	EXPORT_SYMBOL_GPL(wm8400_register_regulator);
352
353	static int __init wm8400_regulator_init(void)
354	{
355	return platform_driver_register(&wm8400_regulator_driver);
356	}
357	module_init(wm8400_regulator_init);
358
359	static void __exit wm8400_regulator_exit(void)
360	{
361	platform_driver_unregister(&wm8400_regulator_driver);
362	}
363	module_exit(wm8400_regulator_exit);
364
365	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
366	MODULE_DESCRIPTION("WM8400 regulator driver");
367	MODULE_LICENSE("GPL");
368	MODULE_ALIAS("platform:wm8400-regulator");