[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_info *info = container_of(rdev->desc,
					struct as3711_regulator_info, desc);
	struct as3711_regulator *reg = rdev->reg_data;

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