[mirror_ubuntu-focal-kernel.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 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 const 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 const 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 = { };
	struct regulator_dev *rdev;
	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);

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

	platform_set_drvdata(pdev, drvdata);

	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,
	.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;
3f0292ae	39
d6cd33ad	40	struct gpio_desc **gpiods;
3f0292ae HS	41	int nr_gpios;
	42
	43	struct gpio_regulator_state *states;
	44	int nr_states;
	45
	46	int state;
	47	};
	48
3f0292ae HS	49	static int gpio_regulator_get_value(struct regulator_dev *dev)
	50	{
	51	struct gpio_regulator_data *data = rdev_get_drvdata(dev);
	52	int ptr;
	53
	54	for (ptr = 0; ptr < data->nr_states; ptr++)
	55	if (data->states[ptr].gpios == data->state)
	56	return data->states[ptr].value;
	57
	58	return -EINVAL;
	59	}
	60
eb0c5686 HS	61	static int gpio_regulator_set_voltage(struct regulator_dev *dev,
	62	int min_uV, int max_uV,
	63	unsigned *selector)
3f0292ae HS	64	{
3f0292ae HS	65	struct gpio_regulator_data *data = rdev_get_drvdata(dev);
00926369	66	int ptr, target = 0, state, best_val = INT_MAX;
3f0292ae	67
3f0292ae	68	for (ptr = 0; ptr < data->nr_states; ptr++)
4dbd8f63	69	if (data->states[ptr].value < best_val &&
eb0c5686 HS	70	data->states[ptr].value >= min_uV &&
eb0c5686 HS	71	data->states[ptr].value <= max_uV) {
3f0292ae	72	target = data->states[ptr].gpios;
00926369	73	best_val = data->states[ptr].value;
b0e4d7bf HS	74	if (selector)
b0e4d7bf HS	75	*selector = ptr;
00926369	76	}
3f0292ae	77
4dbd8f63	78	if (best_val == INT_MAX)
3f0292ae HS	79	return -EINVAL;
	80
	81	for (ptr = 0; ptr < data->nr_gpios; ptr++) {
	82	state = (target & (1 << ptr)) >> ptr;
d6cd33ad	83	gpiod_set_value_cansleep(data->gpiods[ptr], state);
3f0292ae HS	84	}
	85	data->state = target;
	86
	87	return 0;
	88	}
	89
3f0292ae HS	90	static int gpio_regulator_list_voltage(struct regulator_dev *dev,
	91	unsigned selector)
	92	{
	93	struct gpio_regulator_data *data = rdev_get_drvdata(dev);
	94
	95	if (selector >= data->nr_states)
	96	return -EINVAL;
	97
	98	return data->states[selector].value;
	99	}
	100
	101	static int gpio_regulator_set_current_limit(struct regulator_dev *dev,
	102	int min_uA, int max_uA)
	103	{
eb0c5686 HS	104	struct gpio_regulator_data *data = rdev_get_drvdata(dev);
	105	int ptr, target = 0, state, best_val = 0;
	106
	107	for (ptr = 0; ptr < data->nr_states; ptr++)
	108	if (data->states[ptr].value > best_val &&
	109	data->states[ptr].value >= min_uA &&
	110	data->states[ptr].value <= max_uA) {
	111	target = data->states[ptr].gpios;
	112	best_val = data->states[ptr].value;
	113	}
	114
	115	if (best_val == 0)
	116	return -EINVAL;
	117
	118	for (ptr = 0; ptr < data->nr_gpios; ptr++) {
	119	state = (target & (1 << ptr)) >> ptr;
d6cd33ad	120	gpiod_set_value_cansleep(data->gpiods[ptr], state);
eb0c5686 HS	121	}
	122	data->state = target;
	123
	124	return 0;
3f0292ae HS	125	}
3f0292ae HS	126
705e2a90	127	static const struct regulator_ops gpio_regulator_voltage_ops = {
3f0292ae HS	128	.get_voltage = gpio_regulator_get_value,
	129	.set_voltage = gpio_regulator_set_voltage,
	130	.list_voltage = gpio_regulator_list_voltage,
	131	};
	132
a451405f	133	static struct gpio_regulator_config *
072e78b1 JMC	134	of_get_gpio_regulator_config(struct device dev, struct device_node np,
072e78b1 JMC	135	const struct regulator_desc *desc)
006694d0 LJ	136	{
006694d0 LJ	137	struct gpio_regulator_config *config;
006694d0	138	const char *regtype;
d6cd33ad LW	139	int proplen, i;
d6cd33ad LW	140	int ngpios;
251b9c21	141	int ret;
006694d0 LJ	142
	143	config = devm_kzalloc(dev,
	144	sizeof(struct gpio_regulator_config),
	145	GFP_KERNEL);
	146	if (!config)
	147	return ERR_PTR(-ENOMEM);
	148
072e78b1	149	config->init_data = of_get_regulator_init_data(dev, np, desc);
006694d0 LJ	150	if (!config->init_data)
	151	return ERR_PTR(-EINVAL);
	152
	153	config->supply_name = config->init_data->constraints.name;
	154
006694d0 LJ	155	if (of_property_read_bool(np, "enable-at-boot"))
	156	config->enabled_at_boot = true;
	157
	158	of_property_read_u32(np, "startup-delay-us", &config->startup_delay);
	159
d6cd33ad LW	160	/* Fetch GPIO init levels */
	161	ngpios = gpiod_count(dev, NULL);
	162	if (ngpios > 0) {
	163	config->gflags = devm_kzalloc(dev,
	164	sizeof(enum gpiod_flags)
	165	* ngpios,
	166	GFP_KERNEL);
	167	if (!config->gflags)
9f946099 RF	168	return ERR_PTR(-ENOMEM);
9f946099 RF	169
d6cd33ad LW	170	for (i = 0; i < ngpios; i++) {
d6cd33ad LW	171	u32 val;
9f946099	172
d6cd33ad LW	173	ret = of_property_read_u32_index(np, "gpios-states", i,
d6cd33ad LW	174	&val);
0094050d	175
d6cd33ad LW	176	/* Default to high per specification */
	177	if (ret)
	178	config->gflags[i] = GPIOD_OUT_HIGH;
	179	else
	180	config->gflags[i] =
	181	val ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
1f5a9623	182	}
006694d0	183	}
d6cd33ad	184	config->ngpios = ngpios;
006694d0 LJ	185
006694d0 LJ	186	/* Fetch states. */
934624d6 HS	187	proplen = of_property_count_u32_elems(np, "states");
934624d6 HS	188	if (proplen < 0) {
216f2b9c LJ	189	dev_err(dev, "No 'states' property found\n");
	190	return ERR_PTR(-EINVAL);
	191	}
	192
a86854d0 KC	193	config->states = devm_kcalloc(dev,
	194	proplen / 2,
	195	sizeof(struct gpio_regulator_state),
006694d0 LJ	196	GFP_KERNEL);
	197	if (!config->states)
	198	return ERR_PTR(-ENOMEM);
	199
	200	for (i = 0; i < proplen / 2; i++) {
934624d6 HS	201	of_property_read_u32_index(np, "states", i * 2,
	202	&config->states[i].value);
	203	of_property_read_u32_index(np, "states", i * 2 + 1,
	204	&config->states[i].gpios);
006694d0 LJ	205	}
	206	config->nr_states = i;
	207
5b1ada83	208	config->type = REGULATOR_VOLTAGE;
251b9c21	209	ret = of_property_read_string(np, "regulator-type", &regtype);
5b1ada83 MB	210	if (ret >= 0) {
	211	if (!strncmp("voltage", regtype, 7))
	212	config->type = REGULATOR_VOLTAGE;
	213	else if (!strncmp("current", regtype, 7))
	214	config->type = REGULATOR_CURRENT;
9eb9d315 MB	215	else
	216	dev_warn(dev, "Unknown regulator-type '%s'\n",
	217	regtype);
251b9c21	218	}
006694d0	219
006694d0 LJ	220	return config;
	221	}
	222
705e2a90	223	static const struct regulator_ops gpio_regulator_current_ops = {
3f0292ae HS	224	.get_current_limit = gpio_regulator_get_value,
	225	.set_current_limit = gpio_regulator_set_current_limit,
	226	};
	227
a5023574	228	static int gpio_regulator_probe(struct platform_device *pdev)
3f0292ae	229	{
d162d041 LW	230	struct device *dev = &pdev->dev;
	231	struct gpio_regulator_config *config = dev_get_platdata(dev);
	232	struct device_node *np = dev->of_node;
3f0292ae	233	struct gpio_regulator_data *drvdata;
c172708d	234	struct regulator_config cfg = { };
7cdc2ee7	235	struct regulator_dev *rdev;
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
7cdc2ee7 AL	329	rdev = devm_regulator_register(dev, &drvdata->desc, &cfg);
	330	if (IS_ERR(rdev)) {
	331	ret = PTR_ERR(rdev);
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
ec4f7b88	341	#if defined(CONFIG_OF)
3d68dfe3	342	static const struct of_device_id regulator_gpio_of_match[] = {
006694d0 LJ	343	{ .compatible = "regulator-gpio", },
	344	{},
	345	};
2f9481e7	346	MODULE_DEVICE_TABLE(of, regulator_gpio_of_match);
ec4f7b88	347	#endif
006694d0	348
3f0292ae HS	349	static struct platform_driver gpio_regulator_driver = {
3f0292ae HS	350	.probe = gpio_regulator_probe,
3f0292ae HS	351	.driver = {
3f0292ae HS	352	.name = "gpio-regulator",
ec4f7b88	353	.of_match_table = of_match_ptr(regulator_gpio_of_match),
3f0292ae HS	354	},
	355	};
	356
	357	static int __init gpio_regulator_init(void)
	358	{
	359	return platform_driver_register(&gpio_regulator_driver);
	360	}
	361	subsys_initcall(gpio_regulator_init);
	362
	363	static void __exit gpio_regulator_exit(void)
	364	{
	365	platform_driver_unregister(&gpio_regulator_driver);
	366	}
	367	module_exit(gpio_regulator_exit);
	368
	369	MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
	370	MODULE_DESCRIPTION("gpio voltage regulator");
	371	MODULE_LICENSE("GPL");
	372	MODULE_ALIAS("platform:gpio-regulator");