[deliverable/linux.git] / drivers / regulator / as3711-regulator.c

/*
 * AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies
 *
 * Copyright (C) 2012 Renesas Electronics Corporation
 * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the version 2 of the GNU General Public License as
 * published by the Free Software Foundation
 */

#include <linux/err.h>
#include <linux/init.h>
#include <linux/mfd/as3711.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/slab.h>

struct as3711_regulator_info {
	struct regulator_desc	desc;
	unsigned int		max_uV;
};

struct as3711_regulator {
	struct as3711_regulator_info *reg_info;
	struct regulator_dev *rdev;
};

static int as3711_list_voltage_sd(struct regulator_dev *rdev,
				  unsigned int selector)
{
	if (selector >= rdev->desc->n_voltages)
		return -EINVAL;

	if (!selector)
		return 0;
	if (selector < 0x41)
		return 600000 + selector * 12500;
	if (selector < 0x71)
		return 1400000 + (selector - 0x40) * 25000;
	return 2600000 + (selector - 0x70) * 50000;
}

static int as3711_list_voltage_aldo(struct regulator_dev *rdev,
				    unsigned int selector)
{
	if (selector >= rdev->desc->n_voltages)
		return -EINVAL;

	if (selector < 0x10)
		return 1200000 + selector * 50000;
	return 1800000 + (selector - 0x10) * 100000;
}

static int as3711_list_voltage_dldo(struct regulator_dev *rdev,
				    unsigned int selector)
{
	if (selector >= rdev->desc->n_voltages ||
	    (selector > 0x10 && selector < 0x20))
		return -EINVAL;

	if (selector < 0x11)
		return 900000 + selector * 50000;
	return 1750000 + (selector - 0x20) * 50000;
}

static int as3711_bound_check(struct regulator_dev *rdev,
			      int *min_uV, int *max_uV)
{
	struct as3711_regulator *reg = rdev_get_drvdata(rdev);
	struct as3711_regulator_info *info = reg->reg_info;

	dev_dbg(&rdev->dev, "%s(), %d, %d, %d\n", __func__,
		*min_uV, rdev->desc->min_uV, info->max_uV);

	if (*max_uV < *min_uV ||
	    *min_uV > info->max_uV || rdev->desc->min_uV > *max_uV)
		return -EINVAL;

	if (rdev->desc->n_voltages == 1)
		return 0;

	if (*max_uV > info->max_uV)
		*max_uV = info->max_uV;

	if (*min_uV < rdev->desc->min_uV)
		*min_uV = rdev->desc->min_uV;

	return *min_uV;
}

static int as3711_sel_check(int min, int max, int bottom, int step)
{
	int ret, voltage;

	/* Round up min, when dividing: keeps us within the range */
	ret = (min - bottom + step - 1) / step;
	voltage = ret * step + bottom;
	pr_debug("%s(): select %d..%d in %d+N*%d: %d\n", __func__,
	       min, max, bottom, step, ret);
	if (voltage > max) {
		/*
		 * Try 1 down. It will take us below min, but as long we stay
		 * above bottom, we're fine.
		 */
		ret--;
		voltage = ret * step + bottom;
		if (voltage < bottom)
			return -EINVAL;
	}
	return ret;
}

static int as3711_map_voltage_sd(struct regulator_dev *rdev,
				 int min_uV, int max_uV)
{
	int ret;

	ret = as3711_bound_check(rdev, &min_uV, &max_uV);
	if (ret <= 0)
		return ret;

	if (min_uV <= 1400000)
		return as3711_sel_check(min_uV, max_uV, 600000, 12500);

	if (min_uV <= 2600000)
		return as3711_sel_check(min_uV, max_uV, 1400000, 25000) + 0x40;

	return as3711_sel_check(min_uV, max_uV, 2600000, 50000) + 0x70;
}

/*
 * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
 * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
 * FAST:	sdX_fast=1
 * NORMAL:	low_noise=1
 * IDLE:	low_noise=0
 */

static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
{
	unsigned int fast_bit = rdev->desc->enable_mask,
		low_noise_bit = fast_bit << 4;
	u8 val;

	switch (mode) {
	case REGULATOR_MODE_FAST:
		val = fast_bit | low_noise_bit;
		break;
	case REGULATOR_MODE_NORMAL:
		val = low_noise_bit;
		break;
	case REGULATOR_MODE_IDLE:
		val = 0;
		break;
	default:
		return -EINVAL;
	}

	return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
				  low_noise_bit | fast_bit, val);
}

static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
{
	unsigned int fast_bit = rdev->desc->enable_mask,
		low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
	unsigned int val;
	int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);

	if (ret < 0)
		return ret;

	if ((val & mask) == mask)
		return REGULATOR_MODE_FAST;

	if ((val & mask) == low_noise_bit)
		return REGULATOR_MODE_NORMAL;

	if (!(val & mask))
		return REGULATOR_MODE_IDLE;

	return -EINVAL;
}

static int as3711_map_voltage_aldo(struct regulator_dev *rdev,
				  int min_uV, int max_uV)
{
	int ret;

	ret = as3711_bound_check(rdev, &min_uV, &max_uV);
	if (ret <= 0)
		return ret;

	if (min_uV <= 1800000)
		return as3711_sel_check(min_uV, max_uV, 1200000, 50000);

	return as3711_sel_check(min_uV, max_uV, 1800000, 100000) + 0x10;
}

static int as3711_map_voltage_dldo(struct regulator_dev *rdev,
				  int min_uV, int max_uV)
{
	int ret;

	ret = as3711_bound_check(rdev, &min_uV, &max_uV);
	if (ret <= 0)
		return ret;

	if (min_uV <= 1700000)
		return as3711_sel_check(min_uV, max_uV, 900000, 50000);

	return as3711_sel_check(min_uV, max_uV, 1750000, 50000) + 0x20;
}

static struct regulator_ops as3711_sd_ops = {
	.is_enabled		= regulator_is_enabled_regmap,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.list_voltage		= as3711_list_voltage_sd,
	.map_voltage		= as3711_map_voltage_sd,
	.get_mode		= as3711_get_mode_sd,
	.set_mode		= as3711_set_mode_sd,
};

static struct regulator_ops as3711_aldo_ops = {
	.is_enabled		= regulator_is_enabled_regmap,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.list_voltage		= as3711_list_voltage_aldo,
	.map_voltage		= as3711_map_voltage_aldo,
};

static struct regulator_ops as3711_dldo_ops = {
	.is_enabled		= regulator_is_enabled_regmap,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.list_voltage		= as3711_list_voltage_dldo,
	.map_voltage		= as3711_map_voltage_dldo,
};

#define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _vshift, _min_uV, _max_uV, _sfx)	\
	[AS3711_REGULATOR_ ## _id] = {							\
	.desc = {									\
		.name = "as3711-regulator-" # _id,					\
		.id = AS3711_REGULATOR_ ## _id,						\
		.n_voltages = (_vmask + 1),						\
		.ops = &as3711_ ## _sfx ## _ops,					\
		.type = REGULATOR_VOLTAGE,						\
		.owner = THIS_MODULE,							\
		.vsel_reg = AS3711_ ## _id ## _VOLTAGE,					\
		.vsel_mask = _vmask << _vshift,						\
		.enable_reg = AS3711_ ## _en_reg,					\
		.enable_mask = BIT(_en_bit),						\
		.min_uV	= _min_uV,							\
	},										\
	.max_uV = _max_uV,								\
}

static struct as3711_regulator_info as3711_reg_info[] = {
	AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, 0, 612500, 3350000, sd),
	AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, 0, 612500, 3350000, sd),
	AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, 0, 612500, 3350000, sd),
	AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, 0, 612500, 3350000, sd),
	AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
	AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
	AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
	AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
	AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
	AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
	AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
	AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
	/* StepUp output voltage depends on supplying regulator */
};

#define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info)

static int as3711_regulator_probe(struct platform_device *pdev)
{
	struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
	struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
	struct regulator_init_data *reg_data;
	struct regulator_config config = {.dev = &pdev->dev,};
	struct as3711_regulator *reg = NULL;
	struct as3711_regulator *regs;
	struct regulator_dev *rdev;
	struct as3711_regulator_info *ri;
	int ret;
	int id;

	if (!pdata)
		dev_dbg(&pdev->dev, "No platform data...\n");

	regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM *
			sizeof(struct as3711_regulator), GFP_KERNEL);
	if (!regs) {
		dev_err(&pdev->dev, "Memory allocation failed exiting..\n");
		return -ENOMEM;
	}

	for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) {
		reg_data = pdata ? pdata->init_data[id] : NULL;

		/* No need to register if there is no regulator data */
		if (!ri->desc.name)
			continue;

		reg = &regs[id];
		reg->reg_info = ri;

		config.init_data = reg_data;
		config.driver_data = reg;
		config.regmap = as3711->regmap;

		rdev = regulator_register(&ri->desc, &config);
		if (IS_ERR(rdev)) {
			dev_err(&pdev->dev, "Failed to register regulator %s\n",
				ri->desc.name);
			ret = PTR_ERR(rdev);
			goto eregreg;
		}
		reg->rdev = rdev;
	}
	platform_set_drvdata(pdev, regs);
	return 0;

eregreg:
	while (--id >= 0)
		regulator_unregister(regs[id].rdev);

	return ret;
}

static int as3711_regulator_remove(struct platform_device *pdev)
{
	struct as3711_regulator *regs = platform_get_drvdata(pdev);
	int id;

	for (id = 0; id < AS3711_REGULATOR_NUM; ++id)
		regulator_unregister(regs[id].rdev);
	return 0;
}

static struct platform_driver as3711_regulator_driver = {
	.driver	= {
		.name	= "as3711-regulator",
		.owner	= THIS_MODULE,
	},
	.probe		= as3711_regulator_probe,
	.remove		= as3711_regulator_remove,
};

static int __init as3711_regulator_init(void)
{
	return platform_driver_register(&as3711_regulator_driver);
}
subsys_initcall(as3711_regulator_init);

static void __exit as3711_regulator_exit(void)
{
	platform_driver_unregister(&as3711_regulator_driver);
}
module_exit(as3711_regulator_exit);

MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
MODULE_DESCRIPTION("AS3711 regulator driver");
MODULE_ALIAS("platform:as3711-regulator");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
f1e64f90 GL	1	/*
	2	* AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies
	3	*
	4	* Copyright (C) 2012 Renesas Electronics Corporation
	5	* Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the version 2 of the GNU General Public License as
	9	* published by the Free Software Foundation
	10	*/
	11
	12	#include <linux/err.h>
	13	#include <linux/init.h>
	14	#include <linux/mfd/as3711.h>
	15	#include <linux/module.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/regmap.h>
	18	#include <linux/regulator/driver.h>
	19	#include <linux/slab.h>
	20
	21	struct as3711_regulator_info {
	22	struct regulator_desc desc;
	23	unsigned int max_uV;
	24	};
	25
	26	struct as3711_regulator {
	27	struct as3711_regulator_info *reg_info;
	28	struct regulator_dev *rdev;
	29	};
	30
	31	static int as3711_list_voltage_sd(struct regulator_dev *rdev,
	32	unsigned int selector)
	33	{
	34	if (selector >= rdev->desc->n_voltages)
	35	return -EINVAL;
	36
	37	if (!selector)
	38	return 0;
	39	if (selector < 0x41)
	40	return 600000 + selector * 12500;
	41	if (selector < 0x71)
	42	return 1400000 + (selector - 0x40) * 25000;
	43	return 2600000 + (selector - 0x70) * 50000;
	44	}
	45
	46	static int as3711_list_voltage_aldo(struct regulator_dev *rdev,
	47	unsigned int selector)
	48	{
	49	if (selector >= rdev->desc->n_voltages)
	50	return -EINVAL;
	51
	52	if (selector < 0x10)
	53	return 1200000 + selector * 50000;
	54	return 1800000 + (selector - 0x10) * 100000;
	55	}
	56
	57	static int as3711_list_voltage_dldo(struct regulator_dev *rdev,
	58	unsigned int selector)
	59	{
	60	if (selector >= rdev->desc->n_voltages \|\|
	61	(selector > 0x10 && selector < 0x20))
	62	return -EINVAL;
	63
	64	if (selector < 0x11)
65	return 900000 + selector * 50000;
66	return 1750000 + (selector - 0x20) * 50000;
67	}
68
69	static int as3711_bound_check(struct regulator_dev *rdev,
70	int min_uV, int max_uV)
71	{
16ed9f07 AL	72	struct as3711_regulator *reg = rdev_get_drvdata(rdev);
16ed9f07 AL	73	struct as3711_regulator_info *info = reg->reg_info;
f1e64f90 GL	74
	75	dev_dbg(&rdev->dev, "%s(), %d, %d, %d\n", __func__,
	76	*min_uV, rdev->desc->min_uV, info->max_uV);
	77
	78	if (max_uV < min_uV \|\|
16ed9f07	79	min_uV > info->max_uV \|\| rdev->desc->min_uV > max_uV)
f1e64f90 GL	80	return -EINVAL;
	81
	82	if (rdev->desc->n_voltages == 1)
	83	return 0;
	84
	85	if (*max_uV > info->max_uV)
	86	*max_uV = info->max_uV;
	87
	88	if (*min_uV < rdev->desc->min_uV)
	89	*min_uV = rdev->desc->min_uV;
	90
	91	return *min_uV;
	92	}
	93
	94	static int as3711_sel_check(int min, int max, int bottom, int step)
	95	{
	96	int ret, voltage;
	97
	98	/* Round up min, when dividing: keeps us within the range */
	99	ret = (min - bottom + step - 1) / step;
	100	voltage = ret * step + bottom;
	101	pr_debug("%s(): select %d..%d in %d+N*%d: %d\n", __func__,
	102	min, max, bottom, step, ret);
	103	if (voltage > max) {
	104	/*
	105	* Try 1 down. It will take us below min, but as long we stay
	106	* above bottom, we're fine.
	107	*/
	108	ret--;
	109	voltage = ret * step + bottom;
	110	if (voltage < bottom)
	111	return -EINVAL;
	112	}
	113	return ret;
	114	}
	115
	116	static int as3711_map_voltage_sd(struct regulator_dev *rdev,
	117	int min_uV, int max_uV)
	118	{
	119	int ret;
	120
	121	ret = as3711_bound_check(rdev, &min_uV, &max_uV);
	122	if (ret <= 0)
	123	return ret;
	124
	125	if (min_uV <= 1400000)
	126	return as3711_sel_check(min_uV, max_uV, 600000, 12500);
	127
	128	if (min_uV <= 2600000)
	129	return as3711_sel_check(min_uV, max_uV, 1400000, 25000) + 0x40;
	130
	131	return as3711_sel_check(min_uV, max_uV, 2600000, 50000) + 0x70;
	132	}
	133
	134	/*
	135	* The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
	136	* STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
	137	* FAST: sdX_fast=1
	138	* NORMAL: low_noise=1
	139	* IDLE: low_noise=0
	140	*/
	141
	142	static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
	143	{
144	unsigned int fast_bit = rdev->desc->enable_mask,
145	low_noise_bit = fast_bit << 4;
146	u8 val;
147
148	switch (mode) {
149	case REGULATOR_MODE_FAST:
150	val = fast_bit \| low_noise_bit;
151	break;
152	case REGULATOR_MODE_NORMAL:
153	val = low_noise_bit;
154	break;
155	case REGULATOR_MODE_IDLE:
156	val = 0;
157	break;
158	default:
159	return -EINVAL;
160	}
161
162	return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
163	low_noise_bit \| fast_bit, val);
164	}
165
166	static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
167	{
168	unsigned int fast_bit = rdev->desc->enable_mask,
169	low_noise_bit = fast_bit << 4, mask = fast_bit \| low_noise_bit;
170	unsigned int val;
171	int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);
172
173	if (ret < 0)
174	return ret;
175
176	if ((val & mask) == mask)
177	return REGULATOR_MODE_FAST;
178
179	if ((val & mask) == low_noise_bit)
180	return REGULATOR_MODE_NORMAL;
181
182	if (!(val & mask))
183	return REGULATOR_MODE_IDLE;
184
185	return -EINVAL;
186	}
187
188	static int as3711_map_voltage_aldo(struct regulator_dev *rdev,
189	int min_uV, int max_uV)
190	{
191	int ret;
192
193	ret = as3711_bound_check(rdev, &min_uV, &max_uV);
194	if (ret <= 0)
195	return ret;
196
197	if (min_uV <= 1800000)
198	return as3711_sel_check(min_uV, max_uV, 1200000, 50000);
199
200	return as3711_sel_check(min_uV, max_uV, 1800000, 100000) + 0x10;
201	}
202
203	static int as3711_map_voltage_dldo(struct regulator_dev *rdev,
204	int min_uV, int max_uV)
205	{
206	int ret;
207
208	ret = as3711_bound_check(rdev, &min_uV, &max_uV);
209	if (ret <= 0)
210	return ret;
211
212	if (min_uV <= 1700000)
213	return as3711_sel_check(min_uV, max_uV, 900000, 50000);
214
215	return as3711_sel_check(min_uV, max_uV, 1750000, 50000) + 0x20;
216	}
217
218	static struct regulator_ops as3711_sd_ops = {
219	.is_enabled = regulator_is_enabled_regmap,
220	.enable = regulator_enable_regmap,
221	.disable = regulator_disable_regmap,
222	.get_voltage_sel = regulator_get_voltage_sel_regmap,
223	.set_voltage_sel = regulator_set_voltage_sel_regmap,
224	.list_voltage = as3711_list_voltage_sd,
225	.map_voltage = as3711_map_voltage_sd,
226	.get_mode = as3711_get_mode_sd,
227	.set_mode = as3711_set_mode_sd,
228	};
229
230	static struct regulator_ops as3711_aldo_ops = {
231	.is_enabled = regulator_is_enabled_regmap,
232	.enable = regulator_enable_regmap,
233	.disable = regulator_disable_regmap,
234	.get_voltage_sel = regulator_get_voltage_sel_regmap,
235	.set_voltage_sel = regulator_set_voltage_sel_regmap,
236	.list_voltage = as3711_list_voltage_aldo,
237	.map_voltage = as3711_map_voltage_aldo,
238	};
239
240	static struct regulator_ops as3711_dldo_ops = {
241	.is_enabled = regulator_is_enabled_regmap,
242	.enable = regulator_enable_regmap,
243	.disable = regulator_disable_regmap,
244	.get_voltage_sel = regulator_get_voltage_sel_regmap,
245	.set_voltage_sel = regulator_set_voltage_sel_regmap,
246	.list_voltage = as3711_list_voltage_dldo,
247	.map_voltage = as3711_map_voltage_dldo,
248	};
249
250	#define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _vshift, _min_uV, _max_uV, _sfx) \
251	[AS3711_REGULATOR_ ## _id] = { \
252	.desc = { \
253	.name = "as3711-regulator-" # _id, \
254	.id = AS3711_REGULATOR_ ## _id, \
255	.n_voltages = (_vmask + 1), \
256	.ops = &as3711_ ## _sfx ## _ops, \
257	.type = REGULATOR_VOLTAGE, \
258	.owner = THIS_MODULE, \
259	.vsel_reg = AS3711_ ## _id ## _VOLTAGE, \
260	.vsel_mask = _vmask << _vshift, \
261	.enable_reg = AS3711_ ## _en_reg, \
262	.enable_mask = BIT(_en_bit), \
263	.min_uV = _min_uV, \
264	}, \
265	.max_uV = _max_uV, \
266	}
267
268	static struct as3711_regulator_info as3711_reg_info[] = {
269	AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, 0, 612500, 3350000, sd),
270	AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, 0, 612500, 3350000, sd),
271	AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, 0, 612500, 3350000, sd),
272	AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, 0, 612500, 3350000, sd),
273	AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
274	AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
275	AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
276	AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
277	AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
278	AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
279	AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
280	AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
281	/* StepUp output voltage depends on supplying regulator */
282	};
283
284	#define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info)
285
286	static int as3711_regulator_probe(struct platform_device *pdev)
287	{
288	struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
289	struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
290	struct regulator_init_data *reg_data;
291	struct regulator_config config = {.dev = &pdev->dev,};
292	struct as3711_regulator *reg = NULL;
293	struct as3711_regulator *regs;
294	struct regulator_dev *rdev;
295	struct as3711_regulator_info *ri;
296	int ret;
297	int id;
298
299	if (!pdata)
300	dev_dbg(&pdev->dev, "No platform data...\n");
301
302	regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM *
303	sizeof(struct as3711_regulator), GFP_KERNEL);
304	if (!regs) {
305	dev_err(&pdev->dev, "Memory allocation failed exiting..\n");
306	return -ENOMEM;
307	}
308
309	for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) {
310	reg_data = pdata ? pdata->init_data[id] : NULL;
311
312	/* No need to register if there is no regulator data */
313	if (!ri->desc.name)
314	continue;
315
316	reg = &regs[id];
317	reg->reg_info = ri;
318
319	config.init_data = reg_data;
320	config.driver_data = reg;
321	config.regmap = as3711->regmap;
322
323	rdev = regulator_register(&ri->desc, &config);
324	if (IS_ERR(rdev)) {
325	dev_err(&pdev->dev, "Failed to register regulator %s\n",
326	ri->desc.name);
327	ret = PTR_ERR(rdev);
328	goto eregreg;
329	}
330	reg->rdev = rdev;
331	}
332	platform_set_drvdata(pdev, regs);
333	return 0;
334
335	eregreg:
336	while (--id >= 0)
337	regulator_unregister(regs[id].rdev);
338
339	return ret;
340	}
341
342	static int as3711_regulator_remove(struct platform_device *pdev)
343	{
344	struct as3711_regulator *regs = platform_get_drvdata(pdev);
345	int id;
346
347	for (id = 0; id < AS3711_REGULATOR_NUM; ++id)
348	regulator_unregister(regs[id].rdev);
349	return 0;
350	}
351
352	static struct platform_driver as3711_regulator_driver = {
353	.driver = {
354	.name = "as3711-regulator",
355	.owner = THIS_MODULE,
356	},
357	.probe = as3711_regulator_probe,
358	.remove = as3711_regulator_remove,
359	};
360
361	static int __init as3711_regulator_init(void)
362	{
363	return platform_driver_register(&as3711_regulator_driver);
364	}
365	subsys_initcall(as3711_regulator_init);
366
367	static void __exit as3711_regulator_exit(void)
368	{
369	platform_driver_unregister(&as3711_regulator_driver);
370	}
371	module_exit(as3711_regulator_exit);
372
373	MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
374	MODULE_DESCRIPTION("AS3711 regulator driver");
375	MODULE_ALIAS("platform:as3711-regulator");
376	MODULE_LICENSE("GPL v2");