[mirror_ubuntu-bionic-kernel.git] / drivers / regulator / virtual.c

/*
 * reg-virtual-consumer.c
 *
 * Copyright 2008 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.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.
 */

#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>

struct virtual_consumer_data {
	struct mutex lock;
	struct regulator *regulator;
	int enabled;
	int min_uV;
	int max_uV;
	int min_uA;
	int max_uA;
	unsigned int mode;
};

static void update_voltage_constraints(struct device *dev,
				       struct virtual_consumer_data *data)
{
	int ret;

	if (data->min_uV && data->max_uV
	    && data->min_uV <= data->max_uV) {
		dev_dbg(dev, "Requesting %d-%duV\n",
			data->min_uV, data->max_uV);
		ret = regulator_set_voltage(data->regulator,
					data->min_uV, data->max_uV);
		if (ret != 0) {
			dev_err(dev,
				"regulator_set_voltage() failed: %d\n", ret);
			return;
		}
	}

	if (data->min_uV && data->max_uV && !data->enabled) {
		dev_dbg(dev, "Enabling regulator\n");
		ret = regulator_enable(data->regulator);
		if (ret == 0)
			data->enabled = 1;
		else
			dev_err(dev, "regulator_enable() failed: %d\n",
				ret);
	}

	if (!(data->min_uV && data->max_uV) && data->enabled) {
		dev_dbg(dev, "Disabling regulator\n");
		ret = regulator_disable(data->regulator);
		if (ret == 0)
			data->enabled = 0;
		else
			dev_err(dev, "regulator_disable() failed: %d\n",
				ret);
	}
}

static void update_current_limit_constraints(struct device *dev,
					  struct virtual_consumer_data *data)
{
	int ret;

	if (data->max_uA
	    && data->min_uA <= data->max_uA) {
		dev_dbg(dev, "Requesting %d-%duA\n",
			data->min_uA, data->max_uA);
		ret = regulator_set_current_limit(data->regulator,
					data->min_uA, data->max_uA);
		if (ret != 0) {
			dev_err(dev,
				"regulator_set_current_limit() failed: %d\n",
				ret);
			return;
		}
	}

	if (data->max_uA && !data->enabled) {
		dev_dbg(dev, "Enabling regulator\n");
		ret = regulator_enable(data->regulator);
		if (ret == 0)
			data->enabled = 1;
		else
			dev_err(dev, "regulator_enable() failed: %d\n",
				ret);
	}

	if (!(data->min_uA && data->max_uA) && data->enabled) {
		dev_dbg(dev, "Disabling regulator\n");
		ret = regulator_disable(data->regulator);
		if (ret == 0)
			data->enabled = 0;
		else
			dev_err(dev, "regulator_disable() failed: %d\n",
				ret);
	}
}

static ssize_t show_min_uV(struct device *dev,
			   struct device_attribute *attr, char *buf)
{
	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", data->min_uV);
}

static ssize_t set_min_uV(struct device *dev, struct device_attribute *attr,
			  const char *buf, size_t count)
{
	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	long val;

	if (strict_strtol(buf, 10, &val) != 0)
		return count;

	mutex_lock(&data->lock);

	data->min_uV = val;
	update_voltage_constraints(dev, data);

	mutex_unlock(&data->lock);

	return count;
}

static ssize_t show_max_uV(struct device *dev,
			   struct device_attribute *attr, char *buf)
{
	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", data->max_uV);
}

static ssize_t set_max_uV(struct device *dev, struct device_attribute *attr,
			  const char *buf, size_t count)
{
	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	long val;

	if (strict_strtol(buf, 10, &val) != 0)
		return count;

	mutex_lock(&data->lock);

	data->max_uV = val;
	update_voltage_constraints(dev, data);

	mutex_unlock(&data->lock);

	return count;
}

static ssize_t show_min_uA(struct device *dev,
			   struct device_attribute *attr, char *buf)
{
	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", data->min_uA);
}

static ssize_t set_min_uA(struct device *dev, struct device_attribute *attr,
			  const char *buf, size_t count)
{
	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	long val;

	if (strict_strtol(buf, 10, &val) != 0)
		return count;

	mutex_lock(&data->lock);

	data->min_uA = val;
	update_current_limit_constraints(dev, data);

	mutex_unlock(&data->lock);

	return count;
}

static ssize_t show_max_uA(struct device *dev,
			   struct device_attribute *attr, char *buf)
{
	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", data->max_uA);
}

static ssize_t set_max_uA(struct device *dev, struct device_attribute *attr,
			  const char *buf, size_t count)
{
	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	long val;

	if (strict_strtol(buf, 10, &val) != 0)
		return count;

	mutex_lock(&data->lock);

	data->max_uA = val;
	update_current_limit_constraints(dev, data);

	mutex_unlock(&data->lock);

	return count;
}

static ssize_t show_mode(struct device *dev,
			 struct device_attribute *attr, char *buf)
{
	struct virtual_consumer_data *data = dev_get_drvdata(dev);

	switch (data->mode) {
	case REGULATOR_MODE_FAST:
		return sprintf(buf, "fast\n");
	case REGULATOR_MODE_NORMAL:
		return sprintf(buf, "normal\n");
	case REGULATOR_MODE_IDLE:
		return sprintf(buf, "idle\n");
	case REGULATOR_MODE_STANDBY:
		return sprintf(buf, "standby\n");
	default:
		return sprintf(buf, "unknown\n");
	}
}

static ssize_t set_mode(struct device *dev, struct device_attribute *attr,
			const char *buf, size_t count)
{
	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	unsigned int mode;
	int ret;

	/*
	 * sysfs_streq() doesn't need the \n's, but we add them so the strings
	 * will be shared with show_mode(), above.
	 */
	if (sysfs_streq(buf, "fast\n"))
		mode = REGULATOR_MODE_FAST;
	else if (sysfs_streq(buf, "normal\n"))
		mode = REGULATOR_MODE_NORMAL;
	else if (sysfs_streq(buf, "idle\n"))
		mode = REGULATOR_MODE_IDLE;
	else if (sysfs_streq(buf, "standby\n"))
		mode = REGULATOR_MODE_STANDBY;
	else {
		dev_err(dev, "Configuring invalid mode\n");
		return count;
	}

	mutex_lock(&data->lock);
	ret = regulator_set_mode(data->regulator, mode);
	if (ret == 0)
		data->mode = mode;
	else
		dev_err(dev, "Failed to configure mode: %d\n", ret);
	mutex_unlock(&data->lock);

	return count;
}

static DEVICE_ATTR(min_microvolts, 0666, show_min_uV, set_min_uV);
static DEVICE_ATTR(max_microvolts, 0666, show_max_uV, set_max_uV);
static DEVICE_ATTR(min_microamps, 0666, show_min_uA, set_min_uA);
static DEVICE_ATTR(max_microamps, 0666, show_max_uA, set_max_uA);
static DEVICE_ATTR(mode, 0666, show_mode, set_mode);

static struct device_attribute *attributes[] = {
	&dev_attr_min_microvolts,
	&dev_attr_max_microvolts,
	&dev_attr_min_microamps,
	&dev_attr_max_microamps,
	&dev_attr_mode,
};

static int regulator_virtual_consumer_probe(struct platform_device *pdev)
{
	char *reg_id = pdev->dev.platform_data;
	struct virtual_consumer_data *drvdata;
	int ret, i;

	drvdata = kzalloc(sizeof(struct virtual_consumer_data), GFP_KERNEL);
	if (drvdata == NULL) {
		ret = -ENOMEM;
		goto err;
	}

	mutex_init(&drvdata->lock);

	drvdata->regulator = regulator_get(&pdev->dev, reg_id);
	if (IS_ERR(drvdata->regulator)) {
		ret = PTR_ERR(drvdata->regulator);
		dev_err(&pdev->dev, "Failed to obtain supply '%s': %d\n",
			reg_id, ret);
		goto err;
	}

	for (i = 0; i < ARRAY_SIZE(attributes); i++) {
		ret = device_create_file(&pdev->dev, attributes[i]);
		if (ret != 0)
			goto err;
	}

	drvdata->mode = regulator_get_mode(drvdata->regulator);

	platform_set_drvdata(pdev, drvdata);

	return 0;

err:
	for (i = 0; i < ARRAY_SIZE(attributes); i++)
		device_remove_file(&pdev->dev, attributes[i]);
	kfree(drvdata);
	return ret;
}

static int regulator_virtual_consumer_remove(struct platform_device *pdev)
{
	struct virtual_consumer_data *drvdata = platform_get_drvdata(pdev);
	int i;

	for (i = 0; i < ARRAY_SIZE(attributes); i++)
		device_remove_file(&pdev->dev, attributes[i]);
	if (drvdata->enabled)
		regulator_disable(drvdata->regulator);
	regulator_put(drvdata->regulator);

	kfree(drvdata);

	return 0;
}

static struct platform_driver regulator_virtual_consumer_driver = {
	.probe		= regulator_virtual_consumer_probe,
	.remove		= regulator_virtual_consumer_remove,
	.driver		= {
		.name		= "reg-virt-consumer",
	},
};


static int __init regulator_virtual_consumer_init(void)
{
	return platform_driver_register(&regulator_virtual_consumer_driver);
}
module_init(regulator_virtual_consumer_init);

static void __exit regulator_virtual_consumer_exit(void)
{
	platform_driver_unregister(&regulator_virtual_consumer_driver);
}
module_exit(regulator_virtual_consumer_exit);

MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("Virtual regulator consumer");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:reg-virt-consumer");
Commit	Line	Data
c080909e MB	1	/*
	2	* reg-virtual-consumer.c
	3	*
	4	* Copyright 2008 Wolfson Microelectronics PLC.
	5	*
	6	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License as
	10	* published by the Free Software Foundation; either version 2 of the
	11	* License, or (at your option) any later version.
	12	*/
	13
	14	#include <linux/err.h>
	15	#include <linux/mutex.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/regulator/consumer.h>
	18
	19	struct virtual_consumer_data {
	20	struct mutex lock;
	21	struct regulator *regulator;
	22	int enabled;
	23	int min_uV;
	24	int max_uV;
	25	int min_uA;
	26	int max_uA;
	27	unsigned int mode;
	28	};
	29
a07ac217 MB	30	static void update_voltage_constraints(struct device *dev,
a07ac217 MB	31	struct virtual_consumer_data *data)
c080909e MB	32	{
	33	int ret;
	34
	35	if (data->min_uV && data->max_uV
	36	&& data->min_uV <= data->max_uV) {
a5d2abce MB	37	dev_dbg(dev, "Requesting %d-%duV\n",
a5d2abce MB	38	data->min_uV, data->max_uV);
c080909e	39	ret = regulator_set_voltage(data->regulator,
a07ac217	40	data->min_uV, data->max_uV);
c080909e	41	if (ret != 0) {
a07ac217 MB	42	dev_err(dev,
a07ac217 MB	43	"regulator_set_voltage() failed: %d\n", ret);
c080909e MB	44	return;
	45	}
	46	}
	47
	48	if (data->min_uV && data->max_uV && !data->enabled) {
a5d2abce	49	dev_dbg(dev, "Enabling regulator\n");
c080909e MB	50	ret = regulator_enable(data->regulator);
	51	if (ret == 0)
	52	data->enabled = 1;
	53	else
a07ac217	54	dev_err(dev, "regulator_enable() failed: %d\n",
c080909e MB	55	ret);
	56	}
	57
	58	if (!(data->min_uV && data->max_uV) && data->enabled) {
a5d2abce	59	dev_dbg(dev, "Disabling regulator\n");
c080909e MB	60	ret = regulator_disable(data->regulator);
	61	if (ret == 0)
	62	data->enabled = 0;
	63	else
a07ac217	64	dev_err(dev, "regulator_disable() failed: %d\n",
c080909e MB	65	ret);
	66	}
	67	}
	68
a07ac217 MB	69	static void update_current_limit_constraints(struct device *dev,
a07ac217 MB	70	struct virtual_consumer_data *data)
c080909e MB	71	{
	72	int ret;
	73
	74	if (data->max_uA
	75	&& data->min_uA <= data->max_uA) {
a5d2abce MB	76	dev_dbg(dev, "Requesting %d-%duA\n",
a5d2abce MB	77	data->min_uA, data->max_uA);
c080909e MB	78	ret = regulator_set_current_limit(data->regulator,
	79	data->min_uA, data->max_uA);
	80	if (ret != 0) {
a07ac217 MB	81	dev_err(dev,
	82	"regulator_set_current_limit() failed: %d\n",
	83	ret);
c080909e MB	84	return;
	85	}
	86	}
	87
	88	if (data->max_uA && !data->enabled) {
a5d2abce	89	dev_dbg(dev, "Enabling regulator\n");
c080909e MB	90	ret = regulator_enable(data->regulator);
	91	if (ret == 0)
	92	data->enabled = 1;
	93	else
a07ac217	94	dev_err(dev, "regulator_enable() failed: %d\n",
c080909e MB	95	ret);
	96	}
	97
	98	if (!(data->min_uA && data->max_uA) && data->enabled) {
a5d2abce	99	dev_dbg(dev, "Disabling regulator\n");
c080909e MB	100	ret = regulator_disable(data->regulator);
	101	if (ret == 0)
	102	data->enabled = 0;
	103	else
a07ac217	104	dev_err(dev, "regulator_disable() failed: %d\n",
c080909e MB	105	ret);
	106	}
	107	}
	108
	109	static ssize_t show_min_uV(struct device *dev,
	110	struct device_attribute attr, char buf)
	111	{
	112	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	113	return sprintf(buf, "%d\n", data->min_uV);
	114	}
	115
	116	static ssize_t set_min_uV(struct device dev, struct device_attribute attr,
	117	const char *buf, size_t count)
	118	{
	119	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	120	long val;
	121
	122	if (strict_strtol(buf, 10, &val) != 0)
	123	return count;
	124
	125	mutex_lock(&data->lock);
	126
	127	data->min_uV = val;
a07ac217	128	update_voltage_constraints(dev, data);
c080909e MB	129
	130	mutex_unlock(&data->lock);
	131
	132	return count;
	133	}
	134
	135	static ssize_t show_max_uV(struct device *dev,
	136	struct device_attribute attr, char buf)
	137	{
	138	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	139	return sprintf(buf, "%d\n", data->max_uV);
	140	}
	141
	142	static ssize_t set_max_uV(struct device dev, struct device_attribute attr,
	143	const char *buf, size_t count)
	144	{
	145	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	146	long val;
	147
	148	if (strict_strtol(buf, 10, &val) != 0)
	149	return count;
	150
	151	mutex_lock(&data->lock);
	152
	153	data->max_uV = val;
a07ac217	154	update_voltage_constraints(dev, data);
c080909e MB	155
	156	mutex_unlock(&data->lock);
	157
	158	return count;
	159	}
	160
	161	static ssize_t show_min_uA(struct device *dev,
	162	struct device_attribute attr, char buf)
	163	{
	164	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	165	return sprintf(buf, "%d\n", data->min_uA);
	166	}
	167
	168	static ssize_t set_min_uA(struct device dev, struct device_attribute attr,
	169	const char *buf, size_t count)
	170	{
	171	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	172	long val;
	173
	174	if (strict_strtol(buf, 10, &val) != 0)
	175	return count;
	176
	177	mutex_lock(&data->lock);
	178
	179	data->min_uA = val;
a07ac217	180	update_current_limit_constraints(dev, data);
c080909e MB	181
	182	mutex_unlock(&data->lock);
	183
	184	return count;
	185	}
	186
	187	static ssize_t show_max_uA(struct device *dev,
	188	struct device_attribute attr, char buf)
	189	{
	190	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	191	return sprintf(buf, "%d\n", data->max_uA);
	192	}
	193
	194	static ssize_t set_max_uA(struct device dev, struct device_attribute attr,
	195	const char *buf, size_t count)
	196	{
	197	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	198	long val;
	199
	200	if (strict_strtol(buf, 10, &val) != 0)
	201	return count;
	202
	203	mutex_lock(&data->lock);
	204
	205	data->max_uA = val;
a07ac217	206	update_current_limit_constraints(dev, data);
c080909e MB	207
	208	mutex_unlock(&data->lock);
	209
	210	return count;
	211	}
	212
	213	static ssize_t show_mode(struct device *dev,
	214	struct device_attribute attr, char buf)
	215	{
	216	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	217
	218	switch (data->mode) {
	219	case REGULATOR_MODE_FAST:
	220	return sprintf(buf, "fast\n");
	221	case REGULATOR_MODE_NORMAL:
	222	return sprintf(buf, "normal\n");
	223	case REGULATOR_MODE_IDLE:
	224	return sprintf(buf, "idle\n");
	225	case REGULATOR_MODE_STANDBY:
	226	return sprintf(buf, "standby\n");
	227	default:
	228	return sprintf(buf, "unknown\n");
	229	}
	230	}
	231
	232	static ssize_t set_mode(struct device dev, struct device_attribute attr,
	233	const char *buf, size_t count)
	234	{
	235	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	236	unsigned int mode;
	237	int ret;
	238
9485397a AM	239	/*
	240	* sysfs_streq() doesn't need the \n's, but we add them so the strings
	241	* will be shared with show_mode(), above.
	242	*/
aa61d558	243	if (sysfs_streq(buf, "fast\n"))
c080909e	244	mode = REGULATOR_MODE_FAST;
aa61d558	245	else if (sysfs_streq(buf, "normal\n"))
c080909e	246	mode = REGULATOR_MODE_NORMAL;
aa61d558	247	else if (sysfs_streq(buf, "idle\n"))
c080909e	248	mode = REGULATOR_MODE_IDLE;
aa61d558	249	else if (sysfs_streq(buf, "standby\n"))
c080909e MB	250	mode = REGULATOR_MODE_STANDBY;
	251	else {
	252	dev_err(dev, "Configuring invalid mode\n");
	253	return count;
	254	}
	255
	256	mutex_lock(&data->lock);
	257	ret = regulator_set_mode(data->regulator, mode);
	258	if (ret == 0)
	259	data->mode = mode;
	260	else
	261	dev_err(dev, "Failed to configure mode: %d\n", ret);
	262	mutex_unlock(&data->lock);
	263
	264	return count;
	265	}
	266
	267	static DEVICE_ATTR(min_microvolts, 0666, show_min_uV, set_min_uV);
	268	static DEVICE_ATTR(max_microvolts, 0666, show_max_uV, set_max_uV);
	269	static DEVICE_ATTR(min_microamps, 0666, show_min_uA, set_min_uA);
	270	static DEVICE_ATTR(max_microamps, 0666, show_max_uA, set_max_uA);
	271	static DEVICE_ATTR(mode, 0666, show_mode, set_mode);
	272
fefdae42	273	static struct device_attribute *attributes[] = {
c080909e MB	274	&dev_attr_min_microvolts,
	275	&dev_attr_max_microvolts,
	276	&dev_attr_min_microamps,
	277	&dev_attr_max_microamps,
	278	&dev_attr_mode,
	279	};
	280
	281	static int regulator_virtual_consumer_probe(struct platform_device *pdev)
	282	{
	283	char *reg_id = pdev->dev.platform_data;
	284	struct virtual_consumer_data *drvdata;
	285	int ret, i;
	286
	287	drvdata = kzalloc(sizeof(struct virtual_consumer_data), GFP_KERNEL);
	288	if (drvdata == NULL) {
	289	ret = -ENOMEM;
	290	goto err;
	291	}
	292
	293	mutex_init(&drvdata->lock);
	294
	295	drvdata->regulator = regulator_get(&pdev->dev, reg_id);
	296	if (IS_ERR(drvdata->regulator)) {
	297	ret = PTR_ERR(drvdata->regulator);
d61c3d56 MB	298	dev_err(&pdev->dev, "Failed to obtain supply '%s': %d\n",
d61c3d56 MB	299	reg_id, ret);
c080909e MB	300	goto err;
	301	}
	302
	303	for (i = 0; i < ARRAY_SIZE(attributes); i++) {
	304	ret = device_create_file(&pdev->dev, attributes[i]);
	305	if (ret != 0)
	306	goto err;
	307	}
	308
	309	drvdata->mode = regulator_get_mode(drvdata->regulator);
	310
	311	platform_set_drvdata(pdev, drvdata);
	312
	313	return 0;
	314
	315	err:
	316	for (i = 0; i < ARRAY_SIZE(attributes); i++)
	317	device_remove_file(&pdev->dev, attributes[i]);
	318	kfree(drvdata);
	319	return ret;
	320	}
	321
	322	static int regulator_virtual_consumer_remove(struct platform_device *pdev)
	323	{
	324	struct virtual_consumer_data *drvdata = platform_get_drvdata(pdev);
	325	int i;
	326
	327	for (i = 0; i < ARRAY_SIZE(attributes); i++)
	328	device_remove_file(&pdev->dev, attributes[i]);
	329	if (drvdata->enabled)
	330	regulator_disable(drvdata->regulator);
	331	regulator_put(drvdata->regulator);
	332
	333	kfree(drvdata);
	334
	335	return 0;
	336	}
	337
	338	static struct platform_driver regulator_virtual_consumer_driver = {
	339	.probe = regulator_virtual_consumer_probe,
	340	.remove = regulator_virtual_consumer_remove,
	341	.driver = {
	342	.name = "reg-virt-consumer",
	343	},
	344	};
	345
	346
	347	static int __init regulator_virtual_consumer_init(void)
	348	{
	349	return platform_driver_register(&regulator_virtual_consumer_driver);
	350	}
	351	module_init(regulator_virtual_consumer_init);
	352
	353	static void __exit regulator_virtual_consumer_exit(void)
	354	{
	355	platform_driver_unregister(&regulator_virtual_consumer_driver);
	356	}
	357	module_exit(regulator_virtual_consumer_exit);
	358
	359	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	360	MODULE_DESCRIPTION("Virtual regulator consumer");
	361	MODULE_LICENSE("GPL");
38c53c89	362	MODULE_ALIAS("platform:reg-virt-consumer");