[linux-block.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 (config->init_data->constraints.boot_on)
		config->enabled_at_boot = true;

	/*
	 * Do not use: undocumented device tree property.
	 * This is kept around solely for device tree ABI stability.
	 */
	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);
	}

	if (of_property_present(np, "vin-supply"))
		config->input_supply = "vin";

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

	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
	 * descriptor.
	 */
	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",
		.probe_type	= PROBE_PREFER_ASYNCHRONOUS,
		.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
3acff11c CYT	151	if (config->init_data->constraints.boot_on)
	152	config->enabled_at_boot = true;
	153
	154	/*
	155	* Do not use: undocumented device tree property.
	156	* This is kept around solely for device tree ABI stability.
	157	*/
006694d0 LJ	158	if (of_property_read_bool(np, "enable-at-boot"))
	159	config->enabled_at_boot = true;
	160
	161	of_property_read_u32(np, "startup-delay-us", &config->startup_delay);
	162
d6cd33ad LW	163	/* Fetch GPIO init levels */
	164	ngpios = gpiod_count(dev, NULL);
	165	if (ngpios > 0) {
	166	config->gflags = devm_kzalloc(dev,
	167	sizeof(enum gpiod_flags)
	168	* ngpios,
	169	GFP_KERNEL);
	170	if (!config->gflags)
9f946099 RF	171	return ERR_PTR(-ENOMEM);
9f946099 RF	172
d6cd33ad LW	173	for (i = 0; i < ngpios; i++) {
d6cd33ad LW	174	u32 val;
9f946099	175
d6cd33ad LW	176	ret = of_property_read_u32_index(np, "gpios-states", i,
d6cd33ad LW	177	&val);
0094050d	178
d6cd33ad LW	179	/* Default to high per specification */
	180	if (ret)
	181	config->gflags[i] = GPIOD_OUT_HIGH;
	182	else
	183	config->gflags[i] =
	184	val ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
1f5a9623	185	}
006694d0	186	}
d6cd33ad	187	config->ngpios = ngpios;
006694d0 LJ	188
006694d0 LJ	189	/* Fetch states. */
934624d6 HS	190	proplen = of_property_count_u32_elems(np, "states");
934624d6 HS	191	if (proplen < 0) {
216f2b9c LJ	192	dev_err(dev, "No 'states' property found\n");
	193	return ERR_PTR(-EINVAL);
	194	}
	195
a86854d0 KC	196	config->states = devm_kcalloc(dev,
	197	proplen / 2,
	198	sizeof(struct gpio_regulator_state),
006694d0 LJ	199	GFP_KERNEL);
	200	if (!config->states)
	201	return ERR_PTR(-ENOMEM);
	202
	203	for (i = 0; i < proplen / 2; i++) {
934624d6 HS	204	of_property_read_u32_index(np, "states", i * 2,
	205	&config->states[i].value);
	206	of_property_read_u32_index(np, "states", i * 2 + 1,
	207	&config->states[i].gpios);
006694d0 LJ	208	}
	209	config->nr_states = i;
	210
5b1ada83	211	config->type = REGULATOR_VOLTAGE;
251b9c21	212	ret = of_property_read_string(np, "regulator-type", &regtype);
5b1ada83 MB	213	if (ret >= 0) {
	214	if (!strncmp("voltage", regtype, 7))
	215	config->type = REGULATOR_VOLTAGE;
	216	else if (!strncmp("current", regtype, 7))
	217	config->type = REGULATOR_CURRENT;
9eb9d315 MB	218	else
	219	dev_warn(dev, "Unknown regulator-type '%s'\n",
	220	regtype);
251b9c21	221	}
006694d0	222
7dda20c9	223	if (of_property_present(np, "vin-supply"))
adfdfcbd JN	224	config->input_supply = "vin";
adfdfcbd JN	225
006694d0 LJ	226	return config;
	227	}
	228
705e2a90	229	static const struct regulator_ops gpio_regulator_current_ops = {
3f0292ae HS	230	.get_current_limit = gpio_regulator_get_value,
	231	.set_current_limit = gpio_regulator_set_current_limit,
	232	};
	233
a5023574	234	static int gpio_regulator_probe(struct platform_device *pdev)
3f0292ae	235	{
d162d041 LW	236	struct device *dev = &pdev->dev;
	237	struct gpio_regulator_config *config = dev_get_platdata(dev);
	238	struct device_node *np = dev->of_node;
3f0292ae	239	struct gpio_regulator_data *drvdata;
c172708d	240	struct regulator_config cfg = { };
7cdc2ee7	241	struct regulator_dev *rdev;
d6cd33ad LW	242	enum gpiod_flags gflags;
d6cd33ad LW	243	int ptr, ret, state, i;
3f0292ae	244
d162d041	245	drvdata = devm_kzalloc(dev, sizeof(struct gpio_regulator_data),
02b55216	246	GFP_KERNEL);
9c25960c	247	if (drvdata == NULL)
3f0292ae	248	return -ENOMEM;
3f0292ae	249
072e78b1	250	if (np) {
d162d041	251	config = of_get_gpio_regulator_config(dev, np,
072e78b1 JMC	252	&drvdata->desc);
	253	if (IS_ERR(config))
	254	return PTR_ERR(config);
	255	}
	256
d162d041	257	drvdata->desc.name = devm_kstrdup(dev, config->supply_name, GFP_KERNEL);
3f0292ae	258	if (drvdata->desc.name == NULL) {
d162d041	259	dev_err(dev, "Failed to allocate supply name\n");
ed8cffda	260	return -ENOMEM;
3f0292ae HS	261	}
3f0292ae HS	262
d162d041	263	drvdata->gpiods = devm_kzalloc(dev, sizeof(struct gpio_desc *),
d6cd33ad	264	GFP_KERNEL);
adfdfcbd JN	265
	266	if (config->input_supply) {
	267	drvdata->desc.supply_name = devm_kstrdup(&pdev->dev,
	268	config->input_supply,
	269	GFP_KERNEL);
	270	if (!drvdata->desc.supply_name) {
	271	dev_err(&pdev->dev,
	272	"Failed to allocate input supply\n");
	273	return -ENOMEM;
	274	}
	275	}
	276
d6cd33ad LW	277	if (!drvdata->gpiods)
	278	return -ENOMEM;
	279	for (i = 0; i < config->ngpios; i++) {
d162d041	280	drvdata->gpiods[i] = devm_gpiod_get_index(dev,
d6cd33ad LW	281	NULL,
	282	i,
	283	config->gflags[i]);
	284	if (IS_ERR(drvdata->gpiods[i]))
	285	return PTR_ERR(drvdata->gpiods[i]);
	286	/* This is good to know */
	287	gpiod_set_consumer_name(drvdata->gpiods[i], drvdata->desc.name);
3f0292ae	288	}
d6cd33ad	289	drvdata->nr_gpios = config->ngpios;
3f0292ae	290
d162d041 LW	291	drvdata->states = devm_kmemdup(dev,
	292	config->states,
	293	config->nr_states *
	294	sizeof(struct gpio_regulator_state),
	295	GFP_KERNEL);
3f0292ae	296	if (drvdata->states == NULL) {
d162d041 LW	297	dev_err(dev, "Failed to allocate state data\n");
d162d041 LW	298	return -ENOMEM;
3f0292ae HS	299	}
	300	drvdata->nr_states = config->nr_states;
	301
	302	drvdata->desc.owner = THIS_MODULE;
a2a8222b	303	drvdata->desc.enable_time = config->startup_delay;
3f0292ae HS	304
	305	/* handle regulator type*/
	306	switch (config->type) {
	307	case REGULATOR_VOLTAGE:
	308	drvdata->desc.type = REGULATOR_VOLTAGE;
	309	drvdata->desc.ops = &gpio_regulator_voltage_ops;
	310	drvdata->desc.n_voltages = config->nr_states;
	311	break;
	312	case REGULATOR_CURRENT:
	313	drvdata->desc.type = REGULATOR_CURRENT;
	314	drvdata->desc.ops = &gpio_regulator_current_ops;
	315	break;
	316	default:
d162d041 LW	317	dev_err(dev, "No regulator type set\n");
d162d041 LW	318	return -EINVAL;
3f0292ae HS	319	}
3f0292ae HS	320
3f0292ae HS	321	/* build initial state from gpio init data. */
	322	state = 0;
	323	for (ptr = 0; ptr < drvdata->nr_gpios; ptr++) {
d6cd33ad	324	if (config->gflags[ptr] == GPIOD_OUT_HIGH)
3f0292ae HS	325	state \|= (1 << ptr);
	326	}
	327	drvdata->state = state;
	328
d162d041	329	cfg.dev = dev;
c172708d	330	cfg.init_data = config->init_data;
7d4be2f5	331	cfg.driver_data = drvdata;
f8a9f757	332	cfg.of_node = np;
c172708d	333
d6cd33ad LW	334	/*
d6cd33ad LW	335	* The signal will be inverted by the GPIO core if flagged so in the
1f0b7400	336	* descriptor.
d6cd33ad LW	337	*/
	338	if (config->enabled_at_boot)
	339	gflags = GPIOD_OUT_HIGH \| GPIOD_FLAGS_BIT_NONEXCLUSIVE;
	340	else
	341	gflags = GPIOD_OUT_LOW \| GPIOD_FLAGS_BIT_NONEXCLUSIVE;
	342
d162d041 LW	343	cfg.ena_gpiod = gpiod_get_optional(dev, "enable", gflags);
	344	if (IS_ERR(cfg.ena_gpiod))
	345	return PTR_ERR(cfg.ena_gpiod);
4b7c948f	346
7cdc2ee7 AL	347	rdev = devm_regulator_register(dev, &drvdata->desc, &cfg);
	348	if (IS_ERR(rdev)) {
	349	ret = PTR_ERR(rdev);
d162d041 LW	350	dev_err(dev, "Failed to register regulator: %d\n", ret);
d162d041 LW	351	return ret;
3f0292ae HS	352	}
	353
	354	platform_set_drvdata(pdev, drvdata);
	355
	356	return 0;
3f0292ae HS	357	}
3f0292ae HS	358
ec4f7b88	359	#if defined(CONFIG_OF)
3d68dfe3	360	static const struct of_device_id regulator_gpio_of_match[] = {
006694d0 LJ	361	{ .compatible = "regulator-gpio", },
	362	{},
	363	};
2f9481e7	364	MODULE_DEVICE_TABLE(of, regulator_gpio_of_match);
ec4f7b88	365	#endif
006694d0	366
3f0292ae HS	367	static struct platform_driver gpio_regulator_driver = {
3f0292ae HS	368	.probe = gpio_regulator_probe,
3f0292ae HS	369	.driver = {
3f0292ae HS	370	.name = "gpio-regulator",
259b93b2	371	.probe_type = PROBE_PREFER_ASYNCHRONOUS,
ec4f7b88	372	.of_match_table = of_match_ptr(regulator_gpio_of_match),
3f0292ae HS	373	},
	374	};
	375
	376	static int __init gpio_regulator_init(void)
	377	{
	378	return platform_driver_register(&gpio_regulator_driver);
	379	}
	380	subsys_initcall(gpio_regulator_init);
	381
	382	static void __exit gpio_regulator_exit(void)
	383	{
	384	platform_driver_unregister(&gpio_regulator_driver);
	385	}
	386	module_exit(gpio_regulator_exit);
	387
	388	MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
	389	MODULE_DESCRIPTION("gpio voltage regulator");
	390	MODULE_LICENSE("GPL");
	391	MODULE_ALIAS("platform:gpio-regulator");