[mirror_ubuntu-artful-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.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_gpio.h>

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

	struct gpio *gpios;
	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;
		gpio_set_value_cansleep(data->gpios[ptr].gpio, 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;
		gpio_set_value_cansleep(data->gpios[ptr].gpio, 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, gpio, i;
	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-active-high"))
		config->enable_high = true;

	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);

	config->enable_gpio = of_get_named_gpio(np, "enable-gpio", 0);
	if (config->enable_gpio < 0 && config->enable_gpio != -ENOENT)
		return ERR_PTR(config->enable_gpio);

	/* Fetch GPIOs. - optional property*/
	ret = of_gpio_count(np);
	if ((ret < 0) && (ret != -ENOENT))
		return ERR_PTR(ret);

	if (ret > 0) {
		config->nr_gpios = ret;
		config->gpios = devm_kzalloc(dev,
					sizeof(struct gpio) * config->nr_gpios,
					GFP_KERNEL);
		if (!config->gpios)
			return ERR_PTR(-ENOMEM);

		proplen = of_property_count_u32_elems(np, "gpios-states");
		/* optional property */
		if (proplen < 0)
			proplen = 0;

		if (proplen > 0 && proplen != config->nr_gpios) {
			dev_warn(dev, "gpios <-> gpios-states mismatch\n");
			proplen = 0;
		}

		for (i = 0; i < config->nr_gpios; i++) {
			gpio = of_get_named_gpio(np, "gpios", i);
			if (gpio < 0) {
				if (gpio != -ENOENT)
					return ERR_PTR(gpio);
				break;
			}
			config->gpios[i].gpio = gpio;
			if (proplen > 0) {
				of_property_read_u32_index(np, "gpios-states",
							   i, &ret);
				if (ret)
					config->gpios[i].flags =
							   GPIOF_OUT_INIT_HIGH;
			}
		}
	}

	/* 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_kzalloc(dev,
				sizeof(struct gpio_regulator_state)
				* (proplen / 2),
				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 gpio_regulator_config *config = dev_get_platdata(&pdev->dev);
	struct device_node *np = pdev->dev.of_node;
	struct gpio_regulator_data *drvdata;
	struct regulator_config cfg = { };
	int ptr, ret, state;

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

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

	drvdata->desc.name = kstrdup(config->supply_name, GFP_KERNEL);
	if (drvdata->desc.name == NULL) {
		dev_err(&pdev->dev, "Failed to allocate supply name\n");
		ret = -ENOMEM;
		goto err;
	}

	if (config->nr_gpios != 0) {
		drvdata->gpios = kmemdup(config->gpios,
					 config->nr_gpios * sizeof(struct gpio),
					 GFP_KERNEL);
		if (drvdata->gpios == NULL) {
			dev_err(&pdev->dev, "Failed to allocate gpio data\n");
			ret = -ENOMEM;
			goto err_name;
		}

		drvdata->nr_gpios = config->nr_gpios;
		ret = gpio_request_array(drvdata->gpios, drvdata->nr_gpios);
		if (ret) {
			if (ret != -EPROBE_DEFER)
				dev_err(&pdev->dev,
					"Could not obtain regulator setting GPIOs: %d\n",
					ret);
			goto err_memstate;
		}
	}

	drvdata->states = kmemdup(config->states,
				  config->nr_states *
					 sizeof(struct gpio_regulator_state),
				  GFP_KERNEL);
	if (drvdata->states == NULL) {
		dev_err(&pdev->dev, "Failed to allocate state data\n");
		ret = -ENOMEM;
		goto err_memgpio;
	}
	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(&pdev->dev, "No regulator type set\n");
		ret = -EINVAL;
		goto err_memgpio;
	}

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

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

	if (gpio_is_valid(config->enable_gpio)) {
		cfg.ena_gpio = config->enable_gpio;
		cfg.ena_gpio_initialized = true;
	}
	cfg.ena_gpio_invert = !config->enable_high;
	if (config->enabled_at_boot) {
		if (config->enable_high)
			cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH;
		else
			cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW;
	} else {
		if (config->enable_high)
			cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW;
		else
			cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH;
	}

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

	platform_set_drvdata(pdev, drvdata);

	return 0;

err_stategpio:
	gpio_free_array(drvdata->gpios, drvdata->nr_gpios);
err_memstate:
	kfree(drvdata->states);
err_memgpio:
	kfree(drvdata->gpios);
err_name:
	kfree(drvdata->desc.name);
err:
	return ret;
}

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

	regulator_unregister(drvdata->dev);

	gpio_free_array(drvdata->gpios, drvdata->nr_gpios);

	kfree(drvdata->states);
	kfree(drvdata->gpios);

	kfree(drvdata->desc.name);

	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 HS	32	#include <linux/regulator/gpio-regulator.h>
3f0292ae HS	33	#include <linux/gpio.h>
3f0292ae	34	#include <linux/slab.h>
006694d0 LJ	35	#include <linux/of.h>
006694d0 LJ	36	#include <linux/of_gpio.h>
3f0292ae HS	37
	38	struct gpio_regulator_data {
	39	struct regulator_desc desc;
	40	struct regulator_dev *dev;
	41
3f0292ae HS	42	struct gpio *gpios;
	43	int nr_gpios;
	44
	45	struct gpio_regulator_state *states;
	46	int nr_states;
	47
	48	int state;
	49	};
	50
3f0292ae HS	51	static int gpio_regulator_get_value(struct regulator_dev *dev)
	52	{
	53	struct gpio_regulator_data *data = rdev_get_drvdata(dev);
	54	int ptr;
	55
	56	for (ptr = 0; ptr < data->nr_states; ptr++)
	57	if (data->states[ptr].gpios == data->state)
	58	return data->states[ptr].value;
	59
	60	return -EINVAL;
	61	}
	62
eb0c5686 HS	63	static int gpio_regulator_set_voltage(struct regulator_dev *dev,
	64	int min_uV, int max_uV,
	65	unsigned *selector)
3f0292ae HS	66	{
3f0292ae HS	67	struct gpio_regulator_data *data = rdev_get_drvdata(dev);
00926369	68	int ptr, target = 0, state, best_val = INT_MAX;
3f0292ae	69
3f0292ae	70	for (ptr = 0; ptr < data->nr_states; ptr++)
4dbd8f63	71	if (data->states[ptr].value < best_val &&
eb0c5686 HS	72	data->states[ptr].value >= min_uV &&
eb0c5686 HS	73	data->states[ptr].value <= max_uV) {
3f0292ae	74	target = data->states[ptr].gpios;
00926369	75	best_val = data->states[ptr].value;
b0e4d7bf HS	76	if (selector)
b0e4d7bf HS	77	*selector = ptr;
00926369	78	}
3f0292ae	79
4dbd8f63	80	if (best_val == INT_MAX)
3f0292ae HS	81	return -EINVAL;
	82
	83	for (ptr = 0; ptr < data->nr_gpios; ptr++) {
	84	state = (target & (1 << ptr)) >> ptr;
3708903e	85	gpio_set_value_cansleep(data->gpios[ptr].gpio, state);
3f0292ae HS	86	}
	87	data->state = target;
	88
	89	return 0;
	90	}
	91
3f0292ae HS	92	static int gpio_regulator_list_voltage(struct regulator_dev *dev,
	93	unsigned selector)
	94	{
	95	struct gpio_regulator_data *data = rdev_get_drvdata(dev);
	96
	97	if (selector >= data->nr_states)
	98	return -EINVAL;
	99
	100	return data->states[selector].value;
	101	}
	102
	103	static int gpio_regulator_set_current_limit(struct regulator_dev *dev,
	104	int min_uA, int max_uA)
	105	{
eb0c5686 HS	106	struct gpio_regulator_data *data = rdev_get_drvdata(dev);
	107	int ptr, target = 0, state, best_val = 0;
	108
	109	for (ptr = 0; ptr < data->nr_states; ptr++)
	110	if (data->states[ptr].value > best_val &&
	111	data->states[ptr].value >= min_uA &&
	112	data->states[ptr].value <= max_uA) {
	113	target = data->states[ptr].gpios;
	114	best_val = data->states[ptr].value;
	115	}
	116
	117	if (best_val == 0)
	118	return -EINVAL;
	119
	120	for (ptr = 0; ptr < data->nr_gpios; ptr++) {
	121	state = (target & (1 << ptr)) >> ptr;
3708903e	122	gpio_set_value_cansleep(data->gpios[ptr].gpio, state);
eb0c5686 HS	123	}
	124	data->state = target;
	125
	126	return 0;
3f0292ae HS	127	}
	128
	129	static struct regulator_ops gpio_regulator_voltage_ops = {
3f0292ae HS	130	.get_voltage = gpio_regulator_get_value,
	131	.set_voltage = gpio_regulator_set_voltage,
	132	.list_voltage = gpio_regulator_list_voltage,
	133	};
	134
a451405f	135	static struct gpio_regulator_config *
072e78b1 JMC	136	of_get_gpio_regulator_config(struct device dev, struct device_node np,
072e78b1 JMC	137	const struct regulator_desc *desc)
006694d0 LJ	138	{
006694d0 LJ	139	struct gpio_regulator_config *config;
006694d0 LJ	140	const char *regtype;
006694d0 LJ	141	int proplen, gpio, i;
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
	156	if (of_property_read_bool(np, "enable-active-high"))
	157	config->enable_high = true;
	158
	159	if (of_property_read_bool(np, "enable-at-boot"))
	160	config->enabled_at_boot = true;
	161
	162	of_property_read_u32(np, "startup-delay-us", &config->startup_delay);
	163
	164	config->enable_gpio = of_get_named_gpio(np, "enable-gpio", 0);
09f2ba0b JZ	165	if (config->enable_gpio < 0 && config->enable_gpio != -ENOENT)
09f2ba0b JZ	166	return ERR_PTR(config->enable_gpio);
006694d0	167
9f946099 RF	168	/* Fetch GPIOs. - optional property*/
	169	ret = of_gpio_count(np);
	170	if ((ret < 0) && (ret != -ENOENT))
	171	return ERR_PTR(ret);
	172
	173	if (ret > 0) {
	174	config->nr_gpios = ret;
	175	config->gpios = devm_kzalloc(dev,
	176	sizeof(struct gpio) * config->nr_gpios,
	177	GFP_KERNEL);
	178	if (!config->gpios)
	179	return ERR_PTR(-ENOMEM);
	180
	181	proplen = of_property_count_u32_elems(np, "gpios-states");
	182	/* optional property */
	183	if (proplen < 0)
	184	proplen = 0;
	185
	186	if (proplen > 0 && proplen != config->nr_gpios) {
	187	dev_warn(dev, "gpios <-> gpios-states mismatch\n");
	188	proplen = 0;
	189	}
0094050d	190
9f946099 RF	191	for (i = 0; i < config->nr_gpios; i++) {
9f946099 RF	192	gpio = of_get_named_gpio(np, "gpios", i);
09f2ba0b JZ	193	if (gpio < 0) {
	194	if (gpio != -ENOENT)
	195	return ERR_PTR(gpio);
9f946099	196	break;
09f2ba0b	197	}
9f946099 RF	198	config->gpios[i].gpio = gpio;
	199	if (proplen > 0) {
	200	of_property_read_u32_index(np, "gpios-states",
	201	i, &ret);
	202	if (ret)
	203	config->gpios[i].flags =
	204	GPIOF_OUT_INIT_HIGH;
	205	}
1f5a9623	206	}
006694d0 LJ	207	}
	208
	209	/* Fetch states. */
934624d6 HS	210	proplen = of_property_count_u32_elems(np, "states");
934624d6 HS	211	if (proplen < 0) {
216f2b9c LJ	212	dev_err(dev, "No 'states' property found\n");
	213	return ERR_PTR(-EINVAL);
	214	}
	215
006694d0 LJ	216	config->states = devm_kzalloc(dev,
	217	sizeof(struct gpio_regulator_state)
	218	* (proplen / 2),
	219	GFP_KERNEL);
	220	if (!config->states)
	221	return ERR_PTR(-ENOMEM);
	222
	223	for (i = 0; i < proplen / 2; i++) {
934624d6 HS	224	of_property_read_u32_index(np, "states", i * 2,
	225	&config->states[i].value);
	226	of_property_read_u32_index(np, "states", i * 2 + 1,
	227	&config->states[i].gpios);
006694d0 LJ	228	}
	229	config->nr_states = i;
	230
5b1ada83	231	config->type = REGULATOR_VOLTAGE;
251b9c21	232	ret = of_property_read_string(np, "regulator-type", &regtype);
5b1ada83 MB	233	if (ret >= 0) {
	234	if (!strncmp("voltage", regtype, 7))
	235	config->type = REGULATOR_VOLTAGE;
	236	else if (!strncmp("current", regtype, 7))
	237	config->type = REGULATOR_CURRENT;
9eb9d315 MB	238	else
	239	dev_warn(dev, "Unknown regulator-type '%s'\n",
	240	regtype);
251b9c21	241	}
006694d0	242
006694d0 LJ	243	return config;
	244	}
	245
3f0292ae	246	static struct regulator_ops gpio_regulator_current_ops = {
3f0292ae HS	247	.get_current_limit = gpio_regulator_get_value,
	248	.set_current_limit = gpio_regulator_set_current_limit,
	249	};
	250
a5023574	251	static int gpio_regulator_probe(struct platform_device *pdev)
3f0292ae	252	{
dff91d0b	253	struct gpio_regulator_config *config = dev_get_platdata(&pdev->dev);
006694d0	254	struct device_node *np = pdev->dev.of_node;
3f0292ae	255	struct gpio_regulator_data *drvdata;
c172708d	256	struct regulator_config cfg = { };
3f0292ae HS	257	int ptr, ret, state;
3f0292ae HS	258
02b55216 MB	259	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct gpio_regulator_data),
02b55216 MB	260	GFP_KERNEL);
9c25960c	261	if (drvdata == NULL)
3f0292ae	262	return -ENOMEM;
3f0292ae	263
072e78b1 JMC	264	if (np) {
	265	config = of_get_gpio_regulator_config(&pdev->dev, np,
	266	&drvdata->desc);
	267	if (IS_ERR(config))
	268	return PTR_ERR(config);
	269	}
	270
3f0292ae HS	271	drvdata->desc.name = kstrdup(config->supply_name, GFP_KERNEL);
	272	if (drvdata->desc.name == NULL) {
	273	dev_err(&pdev->dev, "Failed to allocate supply name\n");
	274	ret = -ENOMEM;
	275	goto err;
	276	}
	277
9f946099 RF	278	if (config->nr_gpios != 0) {
	279	drvdata->gpios = kmemdup(config->gpios,
	280	config->nr_gpios * sizeof(struct gpio),
	281	GFP_KERNEL);
	282	if (drvdata->gpios == NULL) {
	283	dev_err(&pdev->dev, "Failed to allocate gpio data\n");
	284	ret = -ENOMEM;
	285	goto err_name;
	286	}
	287
	288	drvdata->nr_gpios = config->nr_gpios;
	289	ret = gpio_request_array(drvdata->gpios, drvdata->nr_gpios);
	290	if (ret) {
0258382b RV	291	if (ret != -EPROBE_DEFER)
	292	dev_err(&pdev->dev,
	293	"Could not obtain regulator setting GPIOs: %d\n",
	294	ret);
9f946099 RF	295	goto err_memstate;
9f946099 RF	296	}
3f0292ae HS	297	}
	298
	299	drvdata->states = kmemdup(config->states,
	300	config->nr_states *
	301	sizeof(struct gpio_regulator_state),
	302	GFP_KERNEL);
	303	if (drvdata->states == NULL) {
	304	dev_err(&pdev->dev, "Failed to allocate state data\n");
	305	ret = -ENOMEM;
	306	goto err_memgpio;
	307	}
	308	drvdata->nr_states = config->nr_states;
	309
	310	drvdata->desc.owner = THIS_MODULE;
a2a8222b	311	drvdata->desc.enable_time = config->startup_delay;
3f0292ae HS	312
	313	/* handle regulator type*/
	314	switch (config->type) {
	315	case REGULATOR_VOLTAGE:
	316	drvdata->desc.type = REGULATOR_VOLTAGE;
	317	drvdata->desc.ops = &gpio_regulator_voltage_ops;
	318	drvdata->desc.n_voltages = config->nr_states;
	319	break;
	320	case REGULATOR_CURRENT:
	321	drvdata->desc.type = REGULATOR_CURRENT;
	322	drvdata->desc.ops = &gpio_regulator_current_ops;
	323	break;
	324	default:
	325	dev_err(&pdev->dev, "No regulator type set\n");
	326	ret = -EINVAL;
	327	goto err_memgpio;
3f0292ae HS	328	}
3f0292ae HS	329
3f0292ae HS	330	/* build initial state from gpio init data. */
	331	state = 0;
	332	for (ptr = 0; ptr < drvdata->nr_gpios; ptr++) {
	333	if (config->gpios[ptr].flags & GPIOF_OUT_INIT_HIGH)
	334	state \|= (1 << ptr);
	335	}
	336	drvdata->state = state;
	337
c172708d MB	338	cfg.dev = &pdev->dev;
c172708d MB	339	cfg.init_data = config->init_data;
7d4be2f5	340	cfg.driver_data = drvdata;
f8a9f757	341	cfg.of_node = np;
c172708d	342
2454f8d1	343	if (gpio_is_valid(config->enable_gpio)) {
4b7c948f	344	cfg.ena_gpio = config->enable_gpio;
1de3821a MP	345	cfg.ena_gpio_initialized = true;
1de3821a MP	346	}
4b7c948f AL	347	cfg.ena_gpio_invert = !config->enable_high;
	348	if (config->enabled_at_boot) {
	349	if (config->enable_high)
	350	cfg.ena_gpio_flags \|= GPIOF_OUT_INIT_HIGH;
	351	else
	352	cfg.ena_gpio_flags \|= GPIOF_OUT_INIT_LOW;
	353	} else {
	354	if (config->enable_high)
	355	cfg.ena_gpio_flags \|= GPIOF_OUT_INIT_LOW;
	356	else
	357	cfg.ena_gpio_flags \|= GPIOF_OUT_INIT_HIGH;
	358	}
	359
c172708d	360	drvdata->dev = regulator_register(&drvdata->desc, &cfg);
3f0292ae HS	361	if (IS_ERR(drvdata->dev)) {
	362	ret = PTR_ERR(drvdata->dev);
	363	dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret);
	364	goto err_stategpio;
	365	}
	366
	367	platform_set_drvdata(pdev, drvdata);
	368
	369	return 0;
	370
	371	err_stategpio:
	372	gpio_free_array(drvdata->gpios, drvdata->nr_gpios);
3f0292ae HS	373	err_memstate:
	374	kfree(drvdata->states);
	375	err_memgpio:
	376	kfree(drvdata->gpios);
	377	err_name:
	378	kfree(drvdata->desc.name);
	379	err:
3f0292ae HS	380	return ret;
	381	}
	382
8dc995f5	383	static int gpio_regulator_remove(struct platform_device *pdev)
3f0292ae HS	384	{
	385	struct gpio_regulator_data *drvdata = platform_get_drvdata(pdev);
	386
	387	regulator_unregister(drvdata->dev);
	388
	389	gpio_free_array(drvdata->gpios, drvdata->nr_gpios);
	390
	391	kfree(drvdata->states);
	392	kfree(drvdata->gpios);
	393
3f0292ae	394	kfree(drvdata->desc.name);
3f0292ae HS	395
	396	return 0;
	397	}
	398
ec4f7b88	399	#if defined(CONFIG_OF)
3d68dfe3	400	static const struct of_device_id regulator_gpio_of_match[] = {
006694d0 LJ	401	{ .compatible = "regulator-gpio", },
	402	{},
	403	};
2f9481e7	404	MODULE_DEVICE_TABLE(of, regulator_gpio_of_match);
ec4f7b88	405	#endif
006694d0	406
3f0292ae HS	407	static struct platform_driver gpio_regulator_driver = {
3f0292ae HS	408	.probe = gpio_regulator_probe,
5eb9f2b9	409	.remove = gpio_regulator_remove,
3f0292ae HS	410	.driver = {
3f0292ae HS	411	.name = "gpio-regulator",
ec4f7b88	412	.of_match_table = of_match_ptr(regulator_gpio_of_match),
3f0292ae HS	413	},
	414	};
	415
	416	static int __init gpio_regulator_init(void)
	417	{
	418	return platform_driver_register(&gpio_regulator_driver);
	419	}
	420	subsys_initcall(gpio_regulator_init);
	421
	422	static void __exit gpio_regulator_exit(void)
	423	{
	424	platform_driver_unregister(&gpio_regulator_driver);
	425	}
	426	module_exit(gpio_regulator_exit);
	427
	428	MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
	429	MODULE_DESCRIPTION("gpio voltage regulator");
	430	MODULE_LICENSE("GPL");
	431	MODULE_ALIAS("platform:gpio-regulator");