[deliverable/linux.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/gpio-regulator.h>
#include <linux/gpio.h>
#include <linux/slab.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_value(struct regulator_dev *dev,
					int min, int max, 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 &&
		    data->states[ptr].value <= max) {
			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(data->gpios[ptr].gpio, state);
	}
	data->state = target;

	return 0;
}

static int gpio_regulator_set_voltage(struct regulator_dev *dev,
					int min_uV, int max_uV,
					unsigned *selector)
{
	return gpio_regulator_set_value(dev, min_uV, max_uV, selector);
}

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)
{
	return gpio_regulator_set_value(dev, min_uA, max_uA, NULL);
}

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

static int __devinit gpio_regulator_probe(struct platform_device *pdev)
{
	struct gpio_regulator_config *config = pdev->dev.platform_data;
	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) {
		dev_err(&pdev->dev, "Failed to allocate device data\n");
		return -ENOMEM;
	}

	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;
	}

	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->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;
		break;
	}

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

	/* 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;

	if (config->enable_gpio >= 0)
		cfg.ena_gpio = config->enable_gpio;
	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 __devexit 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;
}

static struct platform_driver gpio_regulator_driver = {
	.probe		= gpio_regulator_probe,
	.remove		= __devexit_p(gpio_regulator_remove),
	.driver		= {
		.name		= "gpio-regulator",
		.owner		= THIS_MODULE,
	},
};

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>
	31	#include <linux/regulator/gpio-regulator.h>
	32	#include <linux/gpio.h>
3f0292ae HS	33	#include <linux/slab.h>
	34
	35	struct gpio_regulator_data {
	36	struct regulator_desc desc;
	37	struct regulator_dev *dev;
	38
3f0292ae HS	39	struct gpio *gpios;
	40	int nr_gpios;
	41
	42	struct gpio_regulator_state *states;
	43	int nr_states;
	44
	45	int state;
	46	};
	47
3f0292ae HS	48	static int gpio_regulator_get_value(struct regulator_dev *dev)
	49	{
	50	struct gpio_regulator_data *data = rdev_get_drvdata(dev);
	51	int ptr;
	52
	53	for (ptr = 0; ptr < data->nr_states; ptr++)
	54	if (data->states[ptr].gpios == data->state)
	55	return data->states[ptr].value;
	56
	57	return -EINVAL;
	58	}
	59
	60	static int gpio_regulator_set_value(struct regulator_dev *dev,
b0e4d7bf	61	int min, int max, unsigned *selector)
3f0292ae HS	62	{
3f0292ae HS	63	struct gpio_regulator_data *data = rdev_get_drvdata(dev);
00926369	64	int ptr, target = 0, state, best_val = INT_MAX;
3f0292ae	65
3f0292ae	66	for (ptr = 0; ptr < data->nr_states; ptr++)
4dbd8f63 AL	67	if (data->states[ptr].value < best_val &&
4dbd8f63 AL	68	data->states[ptr].value >= min &&
00926369	69	data->states[ptr].value <= max) {
3f0292ae	70	target = data->states[ptr].gpios;
00926369	71	best_val = data->states[ptr].value;
b0e4d7bf HS	72	if (selector)
b0e4d7bf HS	73	*selector = ptr;
00926369	74	}
3f0292ae	75
4dbd8f63	76	if (best_val == INT_MAX)
3f0292ae HS	77	return -EINVAL;
	78
	79	for (ptr = 0; ptr < data->nr_gpios; ptr++) {
	80	state = (target & (1 << ptr)) >> ptr;
	81	gpio_set_value(data->gpios[ptr].gpio, state);
	82	}
	83	data->state = target;
	84
	85	return 0;
	86	}
	87
	88	static int gpio_regulator_set_voltage(struct regulator_dev *dev,
	89	int min_uV, int max_uV,
	90	unsigned *selector)
	91	{
b0e4d7bf	92	return gpio_regulator_set_value(dev, min_uV, max_uV, selector);
3f0292ae HS	93	}
	94
	95	static int gpio_regulator_list_voltage(struct regulator_dev *dev,
	96	unsigned selector)
	97	{
	98	struct gpio_regulator_data *data = rdev_get_drvdata(dev);
	99
	100	if (selector >= data->nr_states)
	101	return -EINVAL;
	102
	103	return data->states[selector].value;
	104	}
	105
	106	static int gpio_regulator_set_current_limit(struct regulator_dev *dev,
	107	int min_uA, int max_uA)
	108	{
b0e4d7bf	109	return gpio_regulator_set_value(dev, min_uA, max_uA, NULL);
3f0292ae HS	110	}
	111
	112	static struct regulator_ops gpio_regulator_voltage_ops = {
3f0292ae HS	113	.get_voltage = gpio_regulator_get_value,
	114	.set_voltage = gpio_regulator_set_voltage,
	115	.list_voltage = gpio_regulator_list_voltage,
	116	};
	117
	118	static struct regulator_ops gpio_regulator_current_ops = {
3f0292ae HS	119	.get_current_limit = gpio_regulator_get_value,
	120	.set_current_limit = gpio_regulator_set_current_limit,
	121	};
	122
	123	static int __devinit gpio_regulator_probe(struct platform_device *pdev)
	124	{
	125	struct gpio_regulator_config *config = pdev->dev.platform_data;
	126	struct gpio_regulator_data *drvdata;
c172708d	127	struct regulator_config cfg = { };
3f0292ae HS	128	int ptr, ret, state;
3f0292ae HS	129
02b55216 MB	130	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct gpio_regulator_data),
02b55216 MB	131	GFP_KERNEL);
3f0292ae HS	132	if (drvdata == NULL) {
	133	dev_err(&pdev->dev, "Failed to allocate device data\n");
	134	return -ENOMEM;
	135	}
	136
	137	drvdata->desc.name = kstrdup(config->supply_name, GFP_KERNEL);
	138	if (drvdata->desc.name == NULL) {
	139	dev_err(&pdev->dev, "Failed to allocate supply name\n");
	140	ret = -ENOMEM;
	141	goto err;
	142	}
	143
	144	drvdata->gpios = kmemdup(config->gpios,
	145	config->nr_gpios * sizeof(struct gpio),
	146	GFP_KERNEL);
	147	if (drvdata->gpios == NULL) {
	148	dev_err(&pdev->dev, "Failed to allocate gpio data\n");
	149	ret = -ENOMEM;
	150	goto err_name;
	151	}
	152
	153	drvdata->states = kmemdup(config->states,
	154	config->nr_states *
	155	sizeof(struct gpio_regulator_state),
	156	GFP_KERNEL);
	157	if (drvdata->states == NULL) {
	158	dev_err(&pdev->dev, "Failed to allocate state data\n");
	159	ret = -ENOMEM;
	160	goto err_memgpio;
	161	}
	162	drvdata->nr_states = config->nr_states;
	163
	164	drvdata->desc.owner = THIS_MODULE;
a2a8222b	165	drvdata->desc.enable_time = config->startup_delay;
3f0292ae HS	166
	167	/* handle regulator type*/
	168	switch (config->type) {
	169	case REGULATOR_VOLTAGE:
	170	drvdata->desc.type = REGULATOR_VOLTAGE;
	171	drvdata->desc.ops = &gpio_regulator_voltage_ops;
	172	drvdata->desc.n_voltages = config->nr_states;
	173	break;
	174	case REGULATOR_CURRENT:
	175	drvdata->desc.type = REGULATOR_CURRENT;
	176	drvdata->desc.ops = &gpio_regulator_current_ops;
	177	break;
	178	default:
	179	dev_err(&pdev->dev, "No regulator type set\n");
	180	ret = -EINVAL;
	181	goto err_memgpio;
	182	break;
	183	}
	184
3f0292ae HS	185	drvdata->nr_gpios = config->nr_gpios;
	186	ret = gpio_request_array(drvdata->gpios, drvdata->nr_gpios);
	187	if (ret) {
	188	dev_err(&pdev->dev,
	189	"Could not obtain regulator setting GPIOs: %d\n", ret);
4b7c948f	190	goto err_memstate;
3f0292ae HS	191	}
	192
	193	/* build initial state from gpio init data. */
	194	state = 0;
	195	for (ptr = 0; ptr < drvdata->nr_gpios; ptr++) {
	196	if (config->gpios[ptr].flags & GPIOF_OUT_INIT_HIGH)
	197	state \|= (1 << ptr);
	198	}
	199	drvdata->state = state;
	200
c172708d MB	201	cfg.dev = &pdev->dev;
c172708d MB	202	cfg.init_data = config->init_data;
7d4be2f5	203	cfg.driver_data = drvdata;
c172708d	204
4b7c948f AL	205	if (config->enable_gpio >= 0)
	206	cfg.ena_gpio = config->enable_gpio;
	207	cfg.ena_gpio_invert = !config->enable_high;
	208	if (config->enabled_at_boot) {
	209	if (config->enable_high)
	210	cfg.ena_gpio_flags \|= GPIOF_OUT_INIT_HIGH;
	211	else
	212	cfg.ena_gpio_flags \|= GPIOF_OUT_INIT_LOW;
	213	} else {
	214	if (config->enable_high)
	215	cfg.ena_gpio_flags \|= GPIOF_OUT_INIT_LOW;
	216	else
	217	cfg.ena_gpio_flags \|= GPIOF_OUT_INIT_HIGH;
	218	}
	219
c172708d	220	drvdata->dev = regulator_register(&drvdata->desc, &cfg);
3f0292ae HS	221	if (IS_ERR(drvdata->dev)) {
	222	ret = PTR_ERR(drvdata->dev);
	223	dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret);
	224	goto err_stategpio;
	225	}
	226
	227	platform_set_drvdata(pdev, drvdata);
	228
	229	return 0;
	230
	231	err_stategpio:
	232	gpio_free_array(drvdata->gpios, drvdata->nr_gpios);
3f0292ae HS	233	err_memstate:
	234	kfree(drvdata->states);
	235	err_memgpio:
	236	kfree(drvdata->gpios);
	237	err_name:
	238	kfree(drvdata->desc.name);
	239	err:
3f0292ae HS	240	return ret;
	241	}
	242
	243	static int __devexit gpio_regulator_remove(struct platform_device *pdev)
	244	{
	245	struct gpio_regulator_data *drvdata = platform_get_drvdata(pdev);
	246
	247	regulator_unregister(drvdata->dev);
	248
	249	gpio_free_array(drvdata->gpios, drvdata->nr_gpios);
	250
	251	kfree(drvdata->states);
	252	kfree(drvdata->gpios);
	253
3f0292ae	254	kfree(drvdata->desc.name);
3f0292ae HS	255
	256	return 0;
	257	}
	258
	259	static struct platform_driver gpio_regulator_driver = {
	260	.probe = gpio_regulator_probe,
	261	.remove = __devexit_p(gpio_regulator_remove),
	262	.driver = {
	263	.name = "gpio-regulator",
	264	.owner = THIS_MODULE,
	265	},
	266	};
	267
	268	static int __init gpio_regulator_init(void)
	269	{
	270	return platform_driver_register(&gpio_regulator_driver);
	271	}
	272	subsys_initcall(gpio_regulator_init);
	273
	274	static void __exit gpio_regulator_exit(void)
	275	{
	276	platform_driver_unregister(&gpio_regulator_driver);
	277	}
	278	module_exit(gpio_regulator_exit);
	279
	280	MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
	281	MODULE_DESCRIPTION("gpio voltage regulator");
	282	MODULE_LICENSE("GPL");
	283	MODULE_ALIAS("platform:gpio-regulator");