[mirror_ubuntu-focal-kernel.git] / drivers / regulator / gpio-regulator.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * 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 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
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
3f0292ae HS	2	/*
	3	* gpio-regulator.c
	4	*
	5	* Copyright 2011 Heiko Stuebner <heiko@sntech.de>
	6	*
	7	* based on fixed.c
	8	*
	9	* Copyright 2008 Wolfson Microelectronics PLC.
	10	*
	11	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	12	*
	13	* Copyright (c) 2009 Nokia Corporation
	14	* Roger Quadros <ext-roger.quadros@nokia.com>
	15	*
3f0292ae HS	16	* This is useful for systems with mixed controllable and
	17	* non-controllable regulators, as well as for allowing testing on
	18	* systems with no controllable regulators.
	19	*/
	20
	21	#include <linux/err.h>
	22	#include <linux/mutex.h>
ecc37edf	23	#include <linux/module.h>
3f0292ae HS	24	#include <linux/platform_device.h>
	25	#include <linux/regulator/driver.h>
	26	#include <linux/regulator/machine.h>
006694d0	27	#include <linux/regulator/of_regulator.h>
3f0292ae	28	#include <linux/regulator/gpio-regulator.h>
d6cd33ad	29	#include <linux/gpio/consumer.h>
3f0292ae	30	#include <linux/slab.h>
006694d0	31	#include <linux/of.h>
3f0292ae HS	32
	33	struct gpio_regulator_data {
	34	struct regulator_desc desc;
3f0292ae	35
d6cd33ad	36	struct gpio_desc **gpiods;
3f0292ae HS	37	int nr_gpios;
	38
	39	struct gpio_regulator_state *states;
	40	int nr_states;
	41
	42	int state;
	43	};
	44
3f0292ae HS	45	static int gpio_regulator_get_value(struct regulator_dev *dev)
	46	{
	47	struct gpio_regulator_data *data = rdev_get_drvdata(dev);
	48	int ptr;
	49
	50	for (ptr = 0; ptr < data->nr_states; ptr++)
	51	if (data->states[ptr].gpios == data->state)
	52	return data->states[ptr].value;
	53
	54	return -EINVAL;
	55	}
	56
eb0c5686 HS	57	static int gpio_regulator_set_voltage(struct regulator_dev *dev,
	58	int min_uV, int max_uV,
	59	unsigned *selector)
3f0292ae HS	60	{
3f0292ae HS	61	struct gpio_regulator_data *data = rdev_get_drvdata(dev);
00926369	62	int ptr, target = 0, state, best_val = INT_MAX;
3f0292ae	63
3f0292ae	64	for (ptr = 0; ptr < data->nr_states; ptr++)
4dbd8f63	65	if (data->states[ptr].value < best_val &&
eb0c5686 HS	66	data->states[ptr].value >= min_uV &&
eb0c5686 HS	67	data->states[ptr].value <= max_uV) {
3f0292ae	68	target = data->states[ptr].gpios;
00926369	69	best_val = data->states[ptr].value;
b0e4d7bf HS	70	if (selector)
b0e4d7bf HS	71	*selector = ptr;
00926369	72	}
3f0292ae	73
4dbd8f63	74	if (best_val == INT_MAX)
3f0292ae HS	75	return -EINVAL;
	76
	77	for (ptr = 0; ptr < data->nr_gpios; ptr++) {
	78	state = (target & (1 << ptr)) >> ptr;
d6cd33ad	79	gpiod_set_value_cansleep(data->gpiods[ptr], state);
3f0292ae HS	80	}
	81	data->state = target;
	82
	83	return 0;
	84	}
	85
3f0292ae HS	86	static int gpio_regulator_list_voltage(struct regulator_dev *dev,
	87	unsigned selector)
	88	{
	89	struct gpio_regulator_data *data = rdev_get_drvdata(dev);
	90
	91	if (selector >= data->nr_states)
	92	return -EINVAL;
	93
	94	return data->states[selector].value;
	95	}
	96
	97	static int gpio_regulator_set_current_limit(struct regulator_dev *dev,
	98	int min_uA, int max_uA)
	99	{
eb0c5686 HS	100	struct gpio_regulator_data *data = rdev_get_drvdata(dev);
	101	int ptr, target = 0, state, best_val = 0;
	102
	103	for (ptr = 0; ptr < data->nr_states; ptr++)
	104	if (data->states[ptr].value > best_val &&
	105	data->states[ptr].value >= min_uA &&
	106	data->states[ptr].value <= max_uA) {
	107	target = data->states[ptr].gpios;
	108	best_val = data->states[ptr].value;
	109	}
	110
	111	if (best_val == 0)
	112	return -EINVAL;
	113
	114	for (ptr = 0; ptr < data->nr_gpios; ptr++) {
	115	state = (target & (1 << ptr)) >> ptr;
d6cd33ad	116	gpiod_set_value_cansleep(data->gpiods[ptr], state);
eb0c5686 HS	117	}
	118	data->state = target;
	119
	120	return 0;
3f0292ae HS	121	}
3f0292ae HS	122
705e2a90	123	static const struct regulator_ops gpio_regulator_voltage_ops = {
3f0292ae HS	124	.get_voltage = gpio_regulator_get_value,
	125	.set_voltage = gpio_regulator_set_voltage,
	126	.list_voltage = gpio_regulator_list_voltage,
	127	};
	128
a451405f	129	static struct gpio_regulator_config *
072e78b1 JMC	130	of_get_gpio_regulator_config(struct device dev, struct device_node np,
072e78b1 JMC	131	const struct regulator_desc *desc)
006694d0 LJ	132	{
006694d0 LJ	133	struct gpio_regulator_config *config;
006694d0	134	const char *regtype;
d6cd33ad LW	135	int proplen, i;
d6cd33ad LW	136	int ngpios;
251b9c21	137	int ret;
006694d0 LJ	138
	139	config = devm_kzalloc(dev,
	140	sizeof(struct gpio_regulator_config),
	141	GFP_KERNEL);
	142	if (!config)
	143	return ERR_PTR(-ENOMEM);
	144
072e78b1	145	config->init_data = of_get_regulator_init_data(dev, np, desc);
006694d0 LJ	146	if (!config->init_data)
	147	return ERR_PTR(-EINVAL);
	148
	149	config->supply_name = config->init_data->constraints.name;
	150
006694d0 LJ	151	if (of_property_read_bool(np, "enable-at-boot"))
	152	config->enabled_at_boot = true;
	153
	154	of_property_read_u32(np, "startup-delay-us", &config->startup_delay);
	155
d6cd33ad LW	156	/* Fetch GPIO init levels */
	157	ngpios = gpiod_count(dev, NULL);
	158	if (ngpios > 0) {
	159	config->gflags = devm_kzalloc(dev,
	160	sizeof(enum gpiod_flags)
	161	* ngpios,
	162	GFP_KERNEL);
	163	if (!config->gflags)
9f946099 RF	164	return ERR_PTR(-ENOMEM);
9f946099 RF	165
d6cd33ad LW	166	for (i = 0; i < ngpios; i++) {
d6cd33ad LW	167	u32 val;
9f946099	168
d6cd33ad LW	169	ret = of_property_read_u32_index(np, "gpios-states", i,
d6cd33ad LW	170	&val);
0094050d	171
d6cd33ad LW	172	/* Default to high per specification */
	173	if (ret)
	174	config->gflags[i] = GPIOD_OUT_HIGH;
	175	else
	176	config->gflags[i] =
	177	val ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
1f5a9623	178	}
006694d0	179	}
d6cd33ad	180	config->ngpios = ngpios;
006694d0 LJ	181
006694d0 LJ	182	/* Fetch states. */
934624d6 HS	183	proplen = of_property_count_u32_elems(np, "states");
934624d6 HS	184	if (proplen < 0) {
216f2b9c LJ	185	dev_err(dev, "No 'states' property found\n");
	186	return ERR_PTR(-EINVAL);
	187	}
	188
a86854d0 KC	189	config->states = devm_kcalloc(dev,
	190	proplen / 2,
	191	sizeof(struct gpio_regulator_state),
006694d0 LJ	192	GFP_KERNEL);
	193	if (!config->states)
	194	return ERR_PTR(-ENOMEM);
	195
	196	for (i = 0; i < proplen / 2; i++) {
934624d6 HS	197	of_property_read_u32_index(np, "states", i * 2,
	198	&config->states[i].value);
	199	of_property_read_u32_index(np, "states", i * 2 + 1,
	200	&config->states[i].gpios);
006694d0 LJ	201	}
	202	config->nr_states = i;
	203
5b1ada83	204	config->type = REGULATOR_VOLTAGE;
251b9c21	205	ret = of_property_read_string(np, "regulator-type", &regtype);
5b1ada83 MB	206	if (ret >= 0) {
	207	if (!strncmp("voltage", regtype, 7))
	208	config->type = REGULATOR_VOLTAGE;
	209	else if (!strncmp("current", regtype, 7))
	210	config->type = REGULATOR_CURRENT;
9eb9d315 MB	211	else
	212	dev_warn(dev, "Unknown regulator-type '%s'\n",
	213	regtype);
251b9c21	214	}
006694d0	215
006694d0 LJ	216	return config;
	217	}
	218
705e2a90	219	static const struct regulator_ops gpio_regulator_current_ops = {
3f0292ae HS	220	.get_current_limit = gpio_regulator_get_value,
	221	.set_current_limit = gpio_regulator_set_current_limit,
	222	};
	223
a5023574	224	static int gpio_regulator_probe(struct platform_device *pdev)
3f0292ae	225	{
d162d041 LW	226	struct device *dev = &pdev->dev;
	227	struct gpio_regulator_config *config = dev_get_platdata(dev);
	228	struct device_node *np = dev->of_node;
3f0292ae	229	struct gpio_regulator_data *drvdata;
c172708d	230	struct regulator_config cfg = { };
7cdc2ee7	231	struct regulator_dev *rdev;
d6cd33ad LW	232	enum gpiod_flags gflags;
d6cd33ad LW	233	int ptr, ret, state, i;
3f0292ae	234
d162d041	235	drvdata = devm_kzalloc(dev, sizeof(struct gpio_regulator_data),
02b55216	236	GFP_KERNEL);
9c25960c	237	if (drvdata == NULL)
3f0292ae	238	return -ENOMEM;
3f0292ae	239
072e78b1	240	if (np) {
d162d041	241	config = of_get_gpio_regulator_config(dev, np,
072e78b1 JMC	242	&drvdata->desc);
	243	if (IS_ERR(config))
	244	return PTR_ERR(config);
	245	}
	246
d162d041	247	drvdata->desc.name = devm_kstrdup(dev, config->supply_name, GFP_KERNEL);
3f0292ae	248	if (drvdata->desc.name == NULL) {
d162d041	249	dev_err(dev, "Failed to allocate supply name\n");
ed8cffda	250	return -ENOMEM;
3f0292ae HS	251	}
3f0292ae HS	252
d162d041	253	drvdata->gpiods = devm_kzalloc(dev, sizeof(struct gpio_desc *),
d6cd33ad LW	254	GFP_KERNEL);
	255	if (!drvdata->gpiods)
	256	return -ENOMEM;
	257	for (i = 0; i < config->ngpios; i++) {
d162d041	258	drvdata->gpiods[i] = devm_gpiod_get_index(dev,
d6cd33ad LW	259	NULL,
	260	i,
	261	config->gflags[i]);
	262	if (IS_ERR(drvdata->gpiods[i]))
	263	return PTR_ERR(drvdata->gpiods[i]);
	264	/* This is good to know */
	265	gpiod_set_consumer_name(drvdata->gpiods[i], drvdata->desc.name);
3f0292ae	266	}
d6cd33ad	267	drvdata->nr_gpios = config->ngpios;
3f0292ae	268
d162d041 LW	269	drvdata->states = devm_kmemdup(dev,
	270	config->states,
	271	config->nr_states *
	272	sizeof(struct gpio_regulator_state),
	273	GFP_KERNEL);
3f0292ae	274	if (drvdata->states == NULL) {
d162d041 LW	275	dev_err(dev, "Failed to allocate state data\n");
d162d041 LW	276	return -ENOMEM;
3f0292ae HS	277	}
	278	drvdata->nr_states = config->nr_states;
	279
	280	drvdata->desc.owner = THIS_MODULE;
a2a8222b	281	drvdata->desc.enable_time = config->startup_delay;
3f0292ae HS	282
	283	/* handle regulator type*/
	284	switch (config->type) {
	285	case REGULATOR_VOLTAGE:
	286	drvdata->desc.type = REGULATOR_VOLTAGE;
	287	drvdata->desc.ops = &gpio_regulator_voltage_ops;
	288	drvdata->desc.n_voltages = config->nr_states;
	289	break;
	290	case REGULATOR_CURRENT:
	291	drvdata->desc.type = REGULATOR_CURRENT;
	292	drvdata->desc.ops = &gpio_regulator_current_ops;
	293	break;
	294	default:
d162d041 LW	295	dev_err(dev, "No regulator type set\n");
d162d041 LW	296	return -EINVAL;
3f0292ae HS	297	}
3f0292ae HS	298
3f0292ae HS	299	/* build initial state from gpio init data. */
	300	state = 0;
	301	for (ptr = 0; ptr < drvdata->nr_gpios; ptr++) {
d6cd33ad	302	if (config->gflags[ptr] == GPIOD_OUT_HIGH)
3f0292ae HS	303	state \|= (1 << ptr);
	304	}
	305	drvdata->state = state;
	306
d162d041	307	cfg.dev = dev;
c172708d	308	cfg.init_data = config->init_data;
7d4be2f5	309	cfg.driver_data = drvdata;
f8a9f757	310	cfg.of_node = np;
c172708d	311
d6cd33ad LW	312	/*
	313	* The signal will be inverted by the GPIO core if flagged so in the
	314	* decriptor.
	315	*/
	316	if (config->enabled_at_boot)
	317	gflags = GPIOD_OUT_HIGH \| GPIOD_FLAGS_BIT_NONEXCLUSIVE;
	318	else
	319	gflags = GPIOD_OUT_LOW \| GPIOD_FLAGS_BIT_NONEXCLUSIVE;
	320
d162d041 LW	321	cfg.ena_gpiod = gpiod_get_optional(dev, "enable", gflags);
	322	if (IS_ERR(cfg.ena_gpiod))
	323	return PTR_ERR(cfg.ena_gpiod);
4b7c948f	324
7cdc2ee7 AL	325	rdev = devm_regulator_register(dev, &drvdata->desc, &cfg);
	326	if (IS_ERR(rdev)) {
	327	ret = PTR_ERR(rdev);
d162d041 LW	328	dev_err(dev, "Failed to register regulator: %d\n", ret);
d162d041 LW	329	return ret;
3f0292ae HS	330	}
	331
	332	platform_set_drvdata(pdev, drvdata);
	333
	334	return 0;
3f0292ae HS	335	}
3f0292ae HS	336
ec4f7b88	337	#if defined(CONFIG_OF)
3d68dfe3	338	static const struct of_device_id regulator_gpio_of_match[] = {
006694d0 LJ	339	{ .compatible = "regulator-gpio", },
	340	{},
	341	};
2f9481e7	342	MODULE_DEVICE_TABLE(of, regulator_gpio_of_match);
ec4f7b88	343	#endif
006694d0	344
3f0292ae HS	345	static struct platform_driver gpio_regulator_driver = {
3f0292ae HS	346	.probe = gpio_regulator_probe,
3f0292ae HS	347	.driver = {
3f0292ae HS	348	.name = "gpio-regulator",
ec4f7b88	349	.of_match_table = of_match_ptr(regulator_gpio_of_match),
3f0292ae HS	350	},
	351	};
	352
	353	static int __init gpio_regulator_init(void)
	354	{
	355	return platform_driver_register(&gpio_regulator_driver);
	356	}
	357	subsys_initcall(gpio_regulator_init);
	358
	359	static void __exit gpio_regulator_exit(void)
	360	{
	361	platform_driver_unregister(&gpio_regulator_driver);
	362	}
	363	module_exit(gpio_regulator_exit);
	364
	365	MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
	366	MODULE_DESCRIPTION("gpio voltage regulator");
	367	MODULE_LICENSE("GPL");
	368	MODULE_ALIAS("platform:gpio-regulator");