[GitHub/mt8127/android_kernel_alcatel_ttab.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>
#include <linux/slab.h>
#include <linux/module.h>

struct virtual_consumer_data {
	struct mutex lock;
	struct regulator *regulator;
	bool 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 = true;
		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 = false;
		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 = true;
		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 = false;
		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 (kstrtol(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 (kstrtol(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 (kstrtol(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 (kstrtol(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 attribute *regulator_virtual_attributes[] = {
	&dev_attr_min_microvolts.attr,
	&dev_attr_max_microvolts.attr,
	&dev_attr_min_microamps.attr,
	&dev_attr_max_microamps.attr,
	&dev_attr_mode.attr,
	NULL
};

static const struct attribute_group regulator_virtual_attr_group = {
	.attrs	= regulator_virtual_attributes,
};

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

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

	mutex_init(&drvdata->lock);

	drvdata->regulator = devm_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);
		return ret;
	}

	ret = sysfs_create_group(&pdev->dev.kobj,
				 &regulator_virtual_attr_group);
	if (ret != 0) {
		dev_err(&pdev->dev,
			"Failed to create attribute group: %d\n", ret);
		return ret;
	}

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

	platform_set_drvdata(pdev, drvdata);

	return 0;
}

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

	sysfs_remove_group(&pdev->dev.kobj, &regulator_virtual_attr_group);

	if (drvdata->enabled)
		regulator_disable(drvdata->regulator);

	platform_set_drvdata(pdev, NULL);

	return 0;
}

static struct platform_driver regulator_virtual_consumer_driver = {
	.probe		= regulator_virtual_probe,
	.remove		= regulator_virtual_remove,
	.driver		= {
		.name		= "reg-virt-consumer",
		.owner		= THIS_MODULE,
	},
};

module_platform_driver(regulator_virtual_consumer_driver);

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>
5a0e3ad6	18	#include <linux/slab.h>
65602c32	19	#include <linux/module.h>
c080909e MB	20
	21	struct virtual_consumer_data {
	22	struct mutex lock;
	23	struct regulator *regulator;
4cf95663	24	bool enabled;
c080909e MB	25	int min_uV;
	26	int max_uV;
	27	int min_uA;
	28	int max_uA;
	29	unsigned int mode;
	30	};
	31
a07ac217 MB	32	static void update_voltage_constraints(struct device *dev,
a07ac217 MB	33	struct virtual_consumer_data *data)
c080909e MB	34	{
	35	int ret;
	36
	37	if (data->min_uV && data->max_uV
	38	&& data->min_uV <= data->max_uV) {
a5d2abce MB	39	dev_dbg(dev, "Requesting %d-%duV\n",
a5d2abce MB	40	data->min_uV, data->max_uV);
c080909e	41	ret = regulator_set_voltage(data->regulator,
a07ac217	42	data->min_uV, data->max_uV);
c080909e	43	if (ret != 0) {
a07ac217 MB	44	dev_err(dev,
a07ac217 MB	45	"regulator_set_voltage() failed: %d\n", ret);
c080909e MB	46	return;
	47	}
	48	}
	49
	50	if (data->min_uV && data->max_uV && !data->enabled) {
a5d2abce	51	dev_dbg(dev, "Enabling regulator\n");
c080909e MB	52	ret = regulator_enable(data->regulator);
c080909e MB	53	if (ret == 0)
4cf95663	54	data->enabled = true;
c080909e	55	else
a07ac217	56	dev_err(dev, "regulator_enable() failed: %d\n",
c080909e MB	57	ret);
	58	}
	59
	60	if (!(data->min_uV && data->max_uV) && data->enabled) {
a5d2abce	61	dev_dbg(dev, "Disabling regulator\n");
c080909e MB	62	ret = regulator_disable(data->regulator);
c080909e MB	63	if (ret == 0)
4cf95663	64	data->enabled = false;
c080909e	65	else
a07ac217	66	dev_err(dev, "regulator_disable() failed: %d\n",
c080909e MB	67	ret);
	68	}
	69	}
	70
a07ac217 MB	71	static void update_current_limit_constraints(struct device *dev,
a07ac217 MB	72	struct virtual_consumer_data *data)
c080909e MB	73	{
	74	int ret;
	75
	76	if (data->max_uA
	77	&& data->min_uA <= data->max_uA) {
a5d2abce MB	78	dev_dbg(dev, "Requesting %d-%duA\n",
a5d2abce MB	79	data->min_uA, data->max_uA);
c080909e MB	80	ret = regulator_set_current_limit(data->regulator,
	81	data->min_uA, data->max_uA);
	82	if (ret != 0) {
a07ac217 MB	83	dev_err(dev,
	84	"regulator_set_current_limit() failed: %d\n",
	85	ret);
c080909e MB	86	return;
	87	}
	88	}
	89
	90	if (data->max_uA && !data->enabled) {
a5d2abce	91	dev_dbg(dev, "Enabling regulator\n");
c080909e MB	92	ret = regulator_enable(data->regulator);
c080909e MB	93	if (ret == 0)
4cf95663	94	data->enabled = true;
c080909e	95	else
a07ac217	96	dev_err(dev, "regulator_enable() failed: %d\n",
c080909e MB	97	ret);
	98	}
	99
	100	if (!(data->min_uA && data->max_uA) && data->enabled) {
a5d2abce	101	dev_dbg(dev, "Disabling regulator\n");
c080909e MB	102	ret = regulator_disable(data->regulator);
c080909e MB	103	if (ret == 0)
4cf95663	104	data->enabled = false;
c080909e	105	else
a07ac217	106	dev_err(dev, "regulator_disable() failed: %d\n",
c080909e MB	107	ret);
	108	}
	109	}
	110
	111	static ssize_t show_min_uV(struct device *dev,
	112	struct device_attribute attr, char buf)
	113	{
	114	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	115	return sprintf(buf, "%d\n", data->min_uV);
	116	}
	117
	118	static ssize_t set_min_uV(struct device dev, struct device_attribute attr,
	119	const char *buf, size_t count)
	120	{
	121	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	122	long val;
	123
85960e7b	124	if (kstrtol(buf, 10, &val) != 0)
c080909e MB	125	return count;
	126
	127	mutex_lock(&data->lock);
	128
	129	data->min_uV = val;
a07ac217	130	update_voltage_constraints(dev, data);
c080909e MB	131
	132	mutex_unlock(&data->lock);
	133
	134	return count;
	135	}
	136
	137	static ssize_t show_max_uV(struct device *dev,
	138	struct device_attribute attr, char buf)
	139	{
	140	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	141	return sprintf(buf, "%d\n", data->max_uV);
	142	}
	143
	144	static ssize_t set_max_uV(struct device dev, struct device_attribute attr,
	145	const char *buf, size_t count)
	146	{
	147	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	148	long val;
	149
85960e7b	150	if (kstrtol(buf, 10, &val) != 0)
c080909e MB	151	return count;
	152
	153	mutex_lock(&data->lock);
	154
	155	data->max_uV = val;
a07ac217	156	update_voltage_constraints(dev, data);
c080909e MB	157
	158	mutex_unlock(&data->lock);
	159
	160	return count;
	161	}
	162
	163	static ssize_t show_min_uA(struct device *dev,
	164	struct device_attribute attr, char buf)
	165	{
	166	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	167	return sprintf(buf, "%d\n", data->min_uA);
	168	}
	169
	170	static ssize_t set_min_uA(struct device dev, struct device_attribute attr,
	171	const char *buf, size_t count)
	172	{
	173	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	174	long val;
	175
85960e7b	176	if (kstrtol(buf, 10, &val) != 0)
c080909e MB	177	return count;
	178
	179	mutex_lock(&data->lock);
	180
	181	data->min_uA = val;
a07ac217	182	update_current_limit_constraints(dev, data);
c080909e MB	183
	184	mutex_unlock(&data->lock);
	185
	186	return count;
	187	}
	188
	189	static ssize_t show_max_uA(struct device *dev,
	190	struct device_attribute attr, char buf)
	191	{
	192	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	193	return sprintf(buf, "%d\n", data->max_uA);
	194	}
	195
	196	static ssize_t set_max_uA(struct device dev, struct device_attribute attr,
	197	const char *buf, size_t count)
	198	{
	199	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	200	long val;
	201
85960e7b	202	if (kstrtol(buf, 10, &val) != 0)
c080909e MB	203	return count;
	204
	205	mutex_lock(&data->lock);
	206
	207	data->max_uA = val;
a07ac217	208	update_current_limit_constraints(dev, data);
c080909e MB	209
	210	mutex_unlock(&data->lock);
	211
	212	return count;
	213	}
	214
	215	static ssize_t show_mode(struct device *dev,
	216	struct device_attribute attr, char buf)
	217	{
	218	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	219
	220	switch (data->mode) {
	221	case REGULATOR_MODE_FAST:
	222	return sprintf(buf, "fast\n");
	223	case REGULATOR_MODE_NORMAL:
	224	return sprintf(buf, "normal\n");
	225	case REGULATOR_MODE_IDLE:
	226	return sprintf(buf, "idle\n");
	227	case REGULATOR_MODE_STANDBY:
	228	return sprintf(buf, "standby\n");
	229	default:
	230	return sprintf(buf, "unknown\n");
	231	}
	232	}
	233
	234	static ssize_t set_mode(struct device dev, struct device_attribute attr,
	235	const char *buf, size_t count)
	236	{
	237	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	238	unsigned int mode;
	239	int ret;
	240
9485397a AM	241	/*
	242	* sysfs_streq() doesn't need the \n's, but we add them so the strings
	243	* will be shared with show_mode(), above.
	244	*/
aa61d558	245	if (sysfs_streq(buf, "fast\n"))
c080909e	246	mode = REGULATOR_MODE_FAST;
aa61d558	247	else if (sysfs_streq(buf, "normal\n"))
c080909e	248	mode = REGULATOR_MODE_NORMAL;
aa61d558	249	else if (sysfs_streq(buf, "idle\n"))
c080909e	250	mode = REGULATOR_MODE_IDLE;
aa61d558	251	else if (sysfs_streq(buf, "standby\n"))
c080909e MB	252	mode = REGULATOR_MODE_STANDBY;
	253	else {
	254	dev_err(dev, "Configuring invalid mode\n");
	255	return count;
	256	}
	257
	258	mutex_lock(&data->lock);
	259	ret = regulator_set_mode(data->regulator, mode);
	260	if (ret == 0)
	261	data->mode = mode;
	262	else
	263	dev_err(dev, "Failed to configure mode: %d\n", ret);
	264	mutex_unlock(&data->lock);
	265
	266	return count;
	267	}
	268
	269	static DEVICE_ATTR(min_microvolts, 0666, show_min_uV, set_min_uV);
	270	static DEVICE_ATTR(max_microvolts, 0666, show_max_uV, set_max_uV);
	271	static DEVICE_ATTR(min_microamps, 0666, show_min_uA, set_min_uA);
	272	static DEVICE_ATTR(max_microamps, 0666, show_max_uA, set_max_uA);
	273	static DEVICE_ATTR(mode, 0666, show_mode, set_mode);
	274
4cf95663 DT	275	static struct attribute *regulator_virtual_attributes[] = {
	276	&dev_attr_min_microvolts.attr,
	277	&dev_attr_max_microvolts.attr,
	278	&dev_attr_min_microamps.attr,
	279	&dev_attr_max_microamps.attr,
	280	&dev_attr_mode.attr,
	281	NULL
c080909e MB	282	};
c080909e MB	283
4cf95663 DT	284	static const struct attribute_group regulator_virtual_attr_group = {
	285	.attrs = regulator_virtual_attributes,
	286	};
	287
a5023574	288	static int regulator_virtual_probe(struct platform_device *pdev)
c080909e MB	289	{
	290	char *reg_id = pdev->dev.platform_data;
	291	struct virtual_consumer_data *drvdata;
4cf95663	292	int ret;
c080909e	293
a81edbde AL	294	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct virtual_consumer_data),
a81edbde AL	295	GFP_KERNEL);
4cf95663	296	if (drvdata == NULL)
72b86876	297	return -ENOMEM;
c080909e MB	298
	299	mutex_init(&drvdata->lock);
	300
a81edbde	301	drvdata->regulator = devm_regulator_get(&pdev->dev, reg_id);
c080909e MB	302	if (IS_ERR(drvdata->regulator)) {
c080909e MB	303	ret = PTR_ERR(drvdata->regulator);
d61c3d56 MB	304	dev_err(&pdev->dev, "Failed to obtain supply '%s': %d\n",
d61c3d56 MB	305	reg_id, ret);
a81edbde	306	return ret;
c080909e MB	307	}
c080909e MB	308
4cf95663 DT	309	ret = sysfs_create_group(&pdev->dev.kobj,
	310	&regulator_virtual_attr_group);
	311	if (ret != 0) {
	312	dev_err(&pdev->dev,
	313	"Failed to create attribute group: %d\n", ret);
a81edbde	314	return ret;
c080909e MB	315	}
	316
	317	drvdata->mode = regulator_get_mode(drvdata->regulator);
	318
	319	platform_set_drvdata(pdev, drvdata);
	320
	321	return 0;
c080909e MB	322	}
c080909e MB	323
8dc995f5	324	static int regulator_virtual_remove(struct platform_device *pdev)
c080909e MB	325	{
c080909e MB	326	struct virtual_consumer_data *drvdata = platform_get_drvdata(pdev);
c080909e	327
4cf95663 DT	328	sysfs_remove_group(&pdev->dev.kobj, &regulator_virtual_attr_group);
4cf95663 DT	329
c080909e MB	330	if (drvdata->enabled)
c080909e MB	331	regulator_disable(drvdata->regulator);
c080909e	332
4cf95663 DT	333	platform_set_drvdata(pdev, NULL);
4cf95663 DT	334
c080909e MB	335	return 0;
	336	}
	337
	338	static struct platform_driver regulator_virtual_consumer_driver = {
4cf95663	339	.probe = regulator_virtual_probe,
5eb9f2b9	340	.remove = regulator_virtual_remove,
c080909e MB	341	.driver = {
c080909e MB	342	.name = "reg-virt-consumer",
4cf95663	343	.owner = THIS_MODULE,
c080909e MB	344	},
	345	};
	346
005d610f	347	module_platform_driver(regulator_virtual_consumer_driver);
c080909e MB	348
	349	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	350	MODULE_DESCRIPTION("Virtual regulator consumer");
	351	MODULE_LICENSE("GPL");
38c53c89	352	MODULE_ALIAS("platform:reg-virt-consumer");