[linux-2.6-block.git] / drivers / regulator / gpio-regulator.c

/*
 * gpio-regulator.c
 *
 * Copyright 2011 Heiko Stuebner <heiko@sntech.de>
 *
 * based on fixed.c
 *
 * Copyright 2008 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 * Copyright (c) 2009 Nokia Corporation
 * Roger Quadros <ext-roger.quadros@nokia.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.
 *
 * This is useful for systems with mixed controllable and
 * non-controllable regulators, as well as for allowing testing on
 * systems with no controllable regulators.
 */

#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regulator/gpio-regulator.h>
#include <linux/gpio/consumer.h>
#include <linux/slab.h>
#include <linux/of.h>

struct gpio_regulator_data {
	struct regulator_desc desc;
	struct regulator_dev *dev;

	struct gpio_desc **gpiods;
	int nr_gpios;

	struct gpio_regulator_state *states;
	int nr_states;

	int state;
};

static int gpio_regulator_get_value(struct regulator_dev *dev)
{
	struct gpio_regulator_data *data = rdev_get_drvdata(dev);
	int ptr;

	for (ptr = 0; ptr < data->nr_states; ptr++)
		if (data->states[ptr].gpios == data->state)
			return data->states[ptr].value;

	return -EINVAL;
}

static int gpio_regulator_set_voltage(struct regulator_dev *dev,
					int min_uV, int max_uV,
					unsigned *selector)
{
	struct gpio_regulator_data *data = rdev_get_drvdata(dev);
	int ptr, target = 0, state, best_val = INT_MAX;

	for (ptr = 0; ptr < data->nr_states; ptr++)
		if (data->states[ptr].value < best_val &&
		    data->states[ptr].value >= min_uV &&
		    data->states[ptr].value <= max_uV) {
			target = data->states[ptr].gpios;
			best_val = data->states[ptr].value;
			if (selector)
				*selector = ptr;
		}

	if (best_val == INT_MAX)
		return -EINVAL;

	for (ptr = 0; ptr < data->nr_gpios; ptr++) {
		state = (target & (1 << ptr)) >> ptr;
		gpiod_set_value_cansleep(data->gpiods[ptr], state);
	}
	data->state = target;

	return 0;
}

static int gpio_regulator_list_voltage(struct regulator_dev *dev,
				      unsigned selector)
{
	struct gpio_regulator_data *data = rdev_get_drvdata(dev);

	if (selector >= data->nr_states)
		return -EINVAL;

	return data->states[selector].value;
}

static int gpio_regulator_set_current_limit(struct regulator_dev *dev,
					int min_uA, int max_uA)
{
	struct gpio_regulator_data *data = rdev_get_drvdata(dev);
	int ptr, target = 0, state, best_val = 0;

	for (ptr = 0; ptr < data->nr_states; ptr++)
		if (data->states[ptr].value > best_val &&
		    data->states[ptr].value >= min_uA &&
		    data->states[ptr].value <= max_uA) {
			target = data->states[ptr].gpios;
			best_val = data->states[ptr].value;
		}

	if (best_val == 0)
		return -EINVAL;

	for (ptr = 0; ptr < data->nr_gpios; ptr++) {
		state = (target & (1 << ptr)) >> ptr;
		gpiod_set_value_cansleep(data->gpiods[ptr], state);
	}
	data->state = target;

	return 0;
}

static struct regulator_ops gpio_regulator_voltage_ops = {
	.get_voltage = gpio_regulator_get_value,
	.set_voltage = gpio_regulator_set_voltage,
	.list_voltage = gpio_regulator_list_voltage,
};

static struct gpio_regulator_config *
of_get_gpio_regulator_config(struct device *dev, struct device_node *np,
			     const struct regulator_desc *desc)
{
	struct gpio_regulator_config *config;
	const char *regtype;
	int proplen, i;
	int ngpios;
	int ret;

	config = devm_kzalloc(dev,
			sizeof(struct gpio_regulator_config),
			GFP_KERNEL);
	if (!config)
		return ERR_PTR(-ENOMEM);

	config->init_data = of_get_regulator_init_data(dev, np, desc);
	if (!config->init_data)
		return ERR_PTR(-EINVAL);

	config->supply_name = config->init_data->constraints.name;

	if (of_property_read_bool(np, "enable-at-boot"))
		config->enabled_at_boot = true;

	of_property_read_u32(np, "startup-delay-us", &config->startup_delay);

	/* Fetch GPIO init levels */
	ngpios = gpiod_count(dev, NULL);
	if (ngpios > 0) {
		config->gflags = devm_kzalloc(dev,
					      sizeof(enum gpiod_flags)
					      * ngpios,
					      GFP_KERNEL);
		if (!config->gflags)
			return ERR_PTR(-ENOMEM);

		for (i = 0; i < ngpios; i++) {
			u32 val;

			ret = of_property_read_u32_index(np, "gpios-states", i,
							 &val);

			/* Default to high per specification */
			if (ret)
				config->gflags[i] = GPIOD_OUT_HIGH;
			else
				config->gflags[i] =
					val ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
		}
	}
	config->ngpios = ngpios;

	/* Fetch states. */
	proplen = of_property_count_u32_elems(np, "states");
	if (proplen < 0) {
		dev_err(dev, "No 'states' property found\n");
		return ERR_PTR(-EINVAL);
	}

	config->states = devm_kcalloc(dev,
				proplen / 2,
				sizeof(struct gpio_regulator_state),
				GFP_KERNEL);
	if (!config->states)
		return ERR_PTR(-ENOMEM);

	for (i = 0; i < proplen / 2; i++) {
		of_property_read_u32_index(np, "states", i * 2,
					   &config->states[i].value);
		of_property_read_u32_index(np, "states", i * 2 + 1,
					   &config->states[i].gpios);
	}
	config->nr_states = i;

	config->type = REGULATOR_VOLTAGE;
	ret = of_property_read_string(np, "regulator-type", &regtype);
	if (ret >= 0) {
		if (!strncmp("voltage", regtype, 7))
			config->type = REGULATOR_VOLTAGE;
		else if (!strncmp("current", regtype, 7))
			config->type = REGULATOR_CURRENT;
		else
			dev_warn(dev, "Unknown regulator-type '%s'\n",
				 regtype);
	}

	return config;
}

static struct regulator_ops gpio_regulator_current_ops = {
	.get_current_limit = gpio_regulator_get_value,
	.set_current_limit = gpio_regulator_set_current_limit,
};

static int gpio_regulator_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct gpio_regulator_config *config = dev_get_platdata(dev);
	struct device_node *np = dev->of_node;
	struct gpio_regulator_data *drvdata;
	struct regulator_config cfg = { };
	enum gpiod_flags gflags;
	int ptr, ret, state, i;

	drvdata = devm_kzalloc(dev, sizeof(struct gpio_regulator_data),
			       GFP_KERNEL);
	if (drvdata == NULL)
		return -ENOMEM;

	if (np) {
		config = of_get_gpio_regulator_config(dev, np,
						      &drvdata->desc);
		if (IS_ERR(config))
			return PTR_ERR(config);
	}

	drvdata->desc.name = devm_kstrdup(dev, config->supply_name, GFP_KERNEL);
	if (drvdata->desc.name == NULL) {
		dev_err(dev, "Failed to allocate supply name\n");
		return -ENOMEM;
	}

	drvdata->gpiods = devm_kzalloc(dev, sizeof(struct gpio_desc *),
				       GFP_KERNEL);
	if (!drvdata->gpiods)
		return -ENOMEM;
	for (i = 0; i < config->ngpios; i++) {
		drvdata->gpiods[i] = devm_gpiod_get_index(dev,
							  NULL,
							  i,
							  config->gflags[i]);
		if (IS_ERR(drvdata->gpiods[i]))
			return PTR_ERR(drvdata->gpiods[i]);
		/* This is good to know */
		gpiod_set_consumer_name(drvdata->gpiods[i], drvdata->desc.name);
	}
	drvdata->nr_gpios = config->ngpios;

	drvdata->states = devm_kmemdup(dev,
				       config->states,
				       config->nr_states *
				       sizeof(struct gpio_regulator_state),
				       GFP_KERNEL);
	if (drvdata->states == NULL) {
		dev_err(dev, "Failed to allocate state data\n");
		return -ENOMEM;
	}
	drvdata->nr_states = config->nr_states;

	drvdata->desc.owner = THIS_MODULE;
	drvdata->desc.enable_time = config->startup_delay;

	/* handle regulator type*/
	switch (config->type) {
	case REGULATOR_VOLTAGE:
		drvdata->desc.type = REGULATOR_VOLTAGE;
		drvdata->desc.ops = &gpio_regulator_voltage_ops;
		drvdata->desc.n_voltages = config->nr_states;
		break;
	case REGULATOR_CURRENT:
		drvdata->desc.type = REGULATOR_CURRENT;
		drvdata->desc.ops = &gpio_regulator_current_ops;
		break;
	default:
		dev_err(dev, "No regulator type set\n");
		return -EINVAL;
	}

	/* build initial state from gpio init data. */
	state = 0;
	for (ptr = 0; ptr < drvdata->nr_gpios; ptr++) {
		if (config->gflags[ptr] == GPIOD_OUT_HIGH)
			state |= (1 << ptr);
	}
	drvdata->state = state;

	cfg.dev = dev;
	cfg.init_data = config->init_data;
	cfg.driver_data = drvdata;
	cfg.of_node = np;

	/*
	 * The signal will be inverted by the GPIO core if flagged so in the
	 * decriptor.
	 */
	if (config->enabled_at_boot)
		gflags = GPIOD_OUT_HIGH | GPIOD_FLAGS_BIT_NONEXCLUSIVE;
	else
		gflags = GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE;

	cfg.ena_gpiod = gpiod_get_optional(dev, "enable", gflags);
	if (IS_ERR(cfg.ena_gpiod))
		return PTR_ERR(cfg.ena_gpiod);

	drvdata->dev = regulator_register(&drvdata->desc, &cfg);
	if (IS_ERR(drvdata->dev)) {
		ret = PTR_ERR(drvdata->dev);
		dev_err(dev, "Failed to register regulator: %d\n", ret);
		return ret;
	}

	platform_set_drvdata(pdev, drvdata);

	return 0;
}

static int gpio_regulator_remove(struct platform_device *pdev)
{
	struct gpio_regulator_data *drvdata = platform_get_drvdata(pdev);

	regulator_unregister(drvdata->dev);

	return 0;
}

#if defined(CONFIG_OF)
static const struct of_device_id regulator_gpio_of_match[] = {
	{ .compatible = "regulator-gpio", },
	{},
};
MODULE_DEVICE_TABLE(of, regulator_gpio_of_match);
#endif

static struct platform_driver gpio_regulator_driver = {
	.probe		= gpio_regulator_probe,
	.remove		= gpio_regulator_remove,
	.driver		= {
		.name		= "gpio-regulator",
		.of_match_table = of_match_ptr(regulator_gpio_of_match),
	},
};

static int __init gpio_regulator_init(void)
{
	return platform_driver_register(&gpio_regulator_driver);
}
subsys_initcall(gpio_regulator_init);

static void __exit gpio_regulator_exit(void)
{
	platform_driver_unregister(&gpio_regulator_driver);
}
module_exit(gpio_regulator_exit);

MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
MODULE_DESCRIPTION("gpio voltage regulator");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:gpio-regulator");
Commit	Line	Data
3f0292ae HS	1	/*
	2	* gpio-regulator.c
	3	*
	4	* Copyright 2011 Heiko Stuebner <heiko@sntech.de>
	5	*
	6	* based on fixed.c
	7	*
	8	* Copyright 2008 Wolfson Microelectronics PLC.
	9	*
	10	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	11	*
	12	* Copyright (c) 2009 Nokia Corporation
	13	* Roger Quadros <ext-roger.quadros@nokia.com>
	14	*
	15	* This program is free software; you can redistribute it and/or
	16	* modify it under the terms of the GNU General Public License as
	17	* published by the Free Software Foundation; either version 2 of the
	18	* License, or (at your option) any later version.
	19	*
	20	* This is useful for systems with mixed controllable and
	21	* non-controllable regulators, as well as for allowing testing on
	22	* systems with no controllable regulators.
	23	*/
	24
	25	#include <linux/err.h>
	26	#include <linux/mutex.h>
ecc37edf	27	#include <linux/module.h>
3f0292ae HS	28	#include <linux/platform_device.h>
	29	#include <linux/regulator/driver.h>
	30	#include <linux/regulator/machine.h>
006694d0	31	#include <linux/regulator/of_regulator.h>
3f0292ae	32	#include <linux/regulator/gpio-regulator.h>
d6cd33ad	33	#include <linux/gpio/consumer.h>
3f0292ae	34	#include <linux/slab.h>
006694d0	35	#include <linux/of.h>
3f0292ae HS	36
	37	struct gpio_regulator_data {
	38	struct regulator_desc desc;
	39	struct regulator_dev *dev;
	40
d6cd33ad	41	struct gpio_desc **gpiods;
3f0292ae HS	42	int nr_gpios;
	43
	44	struct gpio_regulator_state *states;
	45	int nr_states;
	46
	47	int state;
	48	};
	49
3f0292ae HS	50	static int gpio_regulator_get_value(struct regulator_dev *dev)
	51	{
	52	struct gpio_regulator_data *data = rdev_get_drvdata(dev);
	53	int ptr;
	54
	55	for (ptr = 0; ptr < data->nr_states; ptr++)
	56	if (data->states[ptr].gpios == data->state)
	57	return data->states[ptr].value;
	58
	59	return -EINVAL;
	60	}
	61
eb0c5686 HS	62	static int gpio_regulator_set_voltage(struct regulator_dev *dev,
	63	int min_uV, int max_uV,
	64	unsigned *selector)
3f0292ae HS	65	{
3f0292ae HS	66	struct gpio_regulator_data *data = rdev_get_drvdata(dev);
00926369	67	int ptr, target = 0, state, best_val = INT_MAX;
3f0292ae	68
3f0292ae	69	for (ptr = 0; ptr < data->nr_states; ptr++)
4dbd8f63	70	if (data->states[ptr].value < best_val &&
eb0c5686 HS	71	data->states[ptr].value >= min_uV &&
eb0c5686 HS	72	data->states[ptr].value <= max_uV) {
3f0292ae	73	target = data->states[ptr].gpios;
00926369	74	best_val = data->states[ptr].value;
b0e4d7bf HS	75	if (selector)
b0e4d7bf HS	76	*selector = ptr;
00926369	77	}
3f0292ae	78
4dbd8f63	79	if (best_val == INT_MAX)
3f0292ae HS	80	return -EINVAL;
	81
	82	for (ptr = 0; ptr < data->nr_gpios; ptr++) {
	83	state = (target & (1 << ptr)) >> ptr;
d6cd33ad	84	gpiod_set_value_cansleep(data->gpiods[ptr], state);
3f0292ae HS	85	}
	86	data->state = target;
	87
	88	return 0;
	89	}
	90
3f0292ae HS	91	static int gpio_regulator_list_voltage(struct regulator_dev *dev,
	92	unsigned selector)
	93	{
	94	struct gpio_regulator_data *data = rdev_get_drvdata(dev);
	95
	96	if (selector >= data->nr_states)
	97	return -EINVAL;
	98
	99	return data->states[selector].value;
	100	}
	101
	102	static int gpio_regulator_set_current_limit(struct regulator_dev *dev,
	103	int min_uA, int max_uA)
	104	{
eb0c5686 HS	105	struct gpio_regulator_data *data = rdev_get_drvdata(dev);
	106	int ptr, target = 0, state, best_val = 0;
	107
	108	for (ptr = 0; ptr < data->nr_states; ptr++)
	109	if (data->states[ptr].value > best_val &&
	110	data->states[ptr].value >= min_uA &&
	111	data->states[ptr].value <= max_uA) {
	112	target = data->states[ptr].gpios;
	113	best_val = data->states[ptr].value;
	114	}
	115
	116	if (best_val == 0)
	117	return -EINVAL;
	118
	119	for (ptr = 0; ptr < data->nr_gpios; ptr++) {
	120	state = (target & (1 << ptr)) >> ptr;
d6cd33ad	121	gpiod_set_value_cansleep(data->gpiods[ptr], state);
eb0c5686 HS	122	}
	123	data->state = target;
	124
	125	return 0;
3f0292ae HS	126	}
	127
	128	static struct regulator_ops gpio_regulator_voltage_ops = {
3f0292ae HS	129	.get_voltage = gpio_regulator_get_value,
	130	.set_voltage = gpio_regulator_set_voltage,
	131	.list_voltage = gpio_regulator_list_voltage,
	132	};
	133
a451405f	134	static struct gpio_regulator_config *
072e78b1 JMC	135	of_get_gpio_regulator_config(struct device dev, struct device_node np,
072e78b1 JMC	136	const struct regulator_desc *desc)
006694d0 LJ	137	{
006694d0 LJ	138	struct gpio_regulator_config *config;
006694d0	139	const char *regtype;
d6cd33ad LW	140	int proplen, i;
d6cd33ad LW	141	int ngpios;
251b9c21	142	int ret;
006694d0 LJ	143
	144	config = devm_kzalloc(dev,
	145	sizeof(struct gpio_regulator_config),
	146	GFP_KERNEL);
	147	if (!config)
	148	return ERR_PTR(-ENOMEM);
	149
072e78b1	150	config->init_data = of_get_regulator_init_data(dev, np, desc);
006694d0 LJ	151	if (!config->init_data)
	152	return ERR_PTR(-EINVAL);
	153
	154	config->supply_name = config->init_data->constraints.name;
	155
006694d0 LJ	156	if (of_property_read_bool(np, "enable-at-boot"))
	157	config->enabled_at_boot = true;
	158
	159	of_property_read_u32(np, "startup-delay-us", &config->startup_delay);
	160
d6cd33ad LW	161	/* Fetch GPIO init levels */
	162	ngpios = gpiod_count(dev, NULL);
	163	if (ngpios > 0) {
	164	config->gflags = devm_kzalloc(dev,
	165	sizeof(enum gpiod_flags)
	166	* ngpios,
	167	GFP_KERNEL);
	168	if (!config->gflags)
9f946099 RF	169	return ERR_PTR(-ENOMEM);
9f946099 RF	170
d6cd33ad LW	171	for (i = 0; i < ngpios; i++) {
d6cd33ad LW	172	u32 val;
9f946099	173
d6cd33ad LW	174	ret = of_property_read_u32_index(np, "gpios-states", i,
d6cd33ad LW	175	&val);
0094050d	176
d6cd33ad LW	177	/* Default to high per specification */
	178	if (ret)
	179	config->gflags[i] = GPIOD_OUT_HIGH;
	180	else
	181	config->gflags[i] =
	182	val ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
1f5a9623	183	}
006694d0	184	}
d6cd33ad	185	config->ngpios = ngpios;
006694d0 LJ	186
006694d0 LJ	187	/* Fetch states. */
934624d6 HS	188	proplen = of_property_count_u32_elems(np, "states");
934624d6 HS	189	if (proplen < 0) {
216f2b9c LJ	190	dev_err(dev, "No 'states' property found\n");
	191	return ERR_PTR(-EINVAL);
	192	}
	193
a86854d0 KC	194	config->states = devm_kcalloc(dev,
	195	proplen / 2,
	196	sizeof(struct gpio_regulator_state),
006694d0 LJ	197	GFP_KERNEL);
	198	if (!config->states)
	199	return ERR_PTR(-ENOMEM);
	200
	201	for (i = 0; i < proplen / 2; i++) {
934624d6 HS	202	of_property_read_u32_index(np, "states", i * 2,
	203	&config->states[i].value);
	204	of_property_read_u32_index(np, "states", i * 2 + 1,
	205	&config->states[i].gpios);
006694d0 LJ	206	}
	207	config->nr_states = i;
	208
5b1ada83	209	config->type = REGULATOR_VOLTAGE;
251b9c21	210	ret = of_property_read_string(np, "regulator-type", &regtype);
5b1ada83 MB	211	if (ret >= 0) {
	212	if (!strncmp("voltage", regtype, 7))
	213	config->type = REGULATOR_VOLTAGE;
	214	else if (!strncmp("current", regtype, 7))
	215	config->type = REGULATOR_CURRENT;
9eb9d315 MB	216	else
	217	dev_warn(dev, "Unknown regulator-type '%s'\n",
	218	regtype);
251b9c21	219	}
006694d0	220
006694d0 LJ	221	return config;
	222	}
	223
3f0292ae	224	static struct regulator_ops gpio_regulator_current_ops = {
3f0292ae HS	225	.get_current_limit = gpio_regulator_get_value,
	226	.set_current_limit = gpio_regulator_set_current_limit,
	227	};
	228
a5023574	229	static int gpio_regulator_probe(struct platform_device *pdev)
3f0292ae	230	{
d162d041 LW	231	struct device *dev = &pdev->dev;
	232	struct gpio_regulator_config *config = dev_get_platdata(dev);
	233	struct device_node *np = dev->of_node;
3f0292ae	234	struct gpio_regulator_data *drvdata;
c172708d	235	struct regulator_config cfg = { };
d6cd33ad LW	236	enum gpiod_flags gflags;
d6cd33ad LW	237	int ptr, ret, state, i;
3f0292ae	238
d162d041	239	drvdata = devm_kzalloc(dev, sizeof(struct gpio_regulator_data),
02b55216	240	GFP_KERNEL);
9c25960c	241	if (drvdata == NULL)
3f0292ae	242	return -ENOMEM;
3f0292ae	243
072e78b1	244	if (np) {
d162d041	245	config = of_get_gpio_regulator_config(dev, np,
072e78b1 JMC	246	&drvdata->desc);
	247	if (IS_ERR(config))
	248	return PTR_ERR(config);
	249	}
	250
d162d041	251	drvdata->desc.name = devm_kstrdup(dev, config->supply_name, GFP_KERNEL);
3f0292ae	252	if (drvdata->desc.name == NULL) {
d162d041	253	dev_err(dev, "Failed to allocate supply name\n");
ed8cffda	254	return -ENOMEM;
3f0292ae HS	255	}
3f0292ae HS	256
d162d041	257	drvdata->gpiods = devm_kzalloc(dev, sizeof(struct gpio_desc *),
d6cd33ad LW	258	GFP_KERNEL);
	259	if (!drvdata->gpiods)
	260	return -ENOMEM;
	261	for (i = 0; i < config->ngpios; i++) {
d162d041	262	drvdata->gpiods[i] = devm_gpiod_get_index(dev,
d6cd33ad LW	263	NULL,
	264	i,
	265	config->gflags[i]);
	266	if (IS_ERR(drvdata->gpiods[i]))
	267	return PTR_ERR(drvdata->gpiods[i]);
	268	/* This is good to know */
	269	gpiod_set_consumer_name(drvdata->gpiods[i], drvdata->desc.name);
3f0292ae	270	}
d6cd33ad	271	drvdata->nr_gpios = config->ngpios;
3f0292ae	272
d162d041 LW	273	drvdata->states = devm_kmemdup(dev,
	274	config->states,
	275	config->nr_states *
	276	sizeof(struct gpio_regulator_state),
	277	GFP_KERNEL);
3f0292ae	278	if (drvdata->states == NULL) {
d162d041 LW	279	dev_err(dev, "Failed to allocate state data\n");
d162d041 LW	280	return -ENOMEM;
3f0292ae HS	281	}
	282	drvdata->nr_states = config->nr_states;
	283
	284	drvdata->desc.owner = THIS_MODULE;
a2a8222b	285	drvdata->desc.enable_time = config->startup_delay;
3f0292ae HS	286
	287	/* handle regulator type*/
	288	switch (config->type) {
	289	case REGULATOR_VOLTAGE:
	290	drvdata->desc.type = REGULATOR_VOLTAGE;
	291	drvdata->desc.ops = &gpio_regulator_voltage_ops;
	292	drvdata->desc.n_voltages = config->nr_states;
	293	break;
	294	case REGULATOR_CURRENT:
	295	drvdata->desc.type = REGULATOR_CURRENT;
	296	drvdata->desc.ops = &gpio_regulator_current_ops;
	297	break;
	298	default:
d162d041 LW	299	dev_err(dev, "No regulator type set\n");
d162d041 LW	300	return -EINVAL;
3f0292ae HS	301	}
3f0292ae HS	302
3f0292ae HS	303	/* build initial state from gpio init data. */
	304	state = 0;
	305	for (ptr = 0; ptr < drvdata->nr_gpios; ptr++) {
d6cd33ad	306	if (config->gflags[ptr] == GPIOD_OUT_HIGH)
3f0292ae HS	307	state \|= (1 << ptr);
	308	}
	309	drvdata->state = state;
	310
d162d041	311	cfg.dev = dev;
c172708d	312	cfg.init_data = config->init_data;
7d4be2f5	313	cfg.driver_data = drvdata;
f8a9f757	314	cfg.of_node = np;
c172708d	315
d6cd33ad LW	316	/*
	317	* The signal will be inverted by the GPIO core if flagged so in the
	318	* decriptor.
	319	*/
	320	if (config->enabled_at_boot)
	321	gflags = GPIOD_OUT_HIGH \| GPIOD_FLAGS_BIT_NONEXCLUSIVE;
	322	else
	323	gflags = GPIOD_OUT_LOW \| GPIOD_FLAGS_BIT_NONEXCLUSIVE;
	324
d162d041 LW	325	cfg.ena_gpiod = gpiod_get_optional(dev, "enable", gflags);
	326	if (IS_ERR(cfg.ena_gpiod))
	327	return PTR_ERR(cfg.ena_gpiod);
4b7c948f	328
c172708d	329	drvdata->dev = regulator_register(&drvdata->desc, &cfg);
3f0292ae HS	330	if (IS_ERR(drvdata->dev)) {
3f0292ae HS	331	ret = PTR_ERR(drvdata->dev);
d162d041 LW	332	dev_err(dev, "Failed to register regulator: %d\n", ret);
d162d041 LW	333	return ret;
3f0292ae HS	334	}
	335
	336	platform_set_drvdata(pdev, drvdata);
	337
	338	return 0;
3f0292ae HS	339	}
3f0292ae HS	340
8dc995f5	341	static int gpio_regulator_remove(struct platform_device *pdev)
3f0292ae HS	342	{
	343	struct gpio_regulator_data *drvdata = platform_get_drvdata(pdev);
	344
	345	regulator_unregister(drvdata->dev);
3f0292ae HS	346
	347	return 0;
	348	}
	349
ec4f7b88	350	#if defined(CONFIG_OF)
3d68dfe3	351	static const struct of_device_id regulator_gpio_of_match[] = {
006694d0 LJ	352	{ .compatible = "regulator-gpio", },
	353	{},
	354	};
2f9481e7	355	MODULE_DEVICE_TABLE(of, regulator_gpio_of_match);
ec4f7b88	356	#endif
006694d0	357
3f0292ae HS	358	static struct platform_driver gpio_regulator_driver = {
3f0292ae HS	359	.probe = gpio_regulator_probe,
5eb9f2b9	360	.remove = gpio_regulator_remove,
3f0292ae HS	361	.driver = {
3f0292ae HS	362	.name = "gpio-regulator",
ec4f7b88	363	.of_match_table = of_match_ptr(regulator_gpio_of_match),
3f0292ae HS	364	},
	365	};
	366
	367	static int __init gpio_regulator_init(void)
	368	{
	369	return platform_driver_register(&gpio_regulator_driver);
	370	}
	371	subsys_initcall(gpio_regulator_init);
	372
	373	static void __exit gpio_regulator_exit(void)
	374	{
	375	platform_driver_unregister(&gpio_regulator_driver);
	376	}
	377	module_exit(gpio_regulator_exit);
	378
	379	MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
	380	MODULE_DESCRIPTION("gpio voltage regulator");
	381	MODULE_LICENSE("GPL");
	382	MODULE_ALIAS("platform:gpio-regulator");