[linux-2.6-block.git] / drivers / regulator / userspace-consumer.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * userspace-consumer.c
 *
 * Copyright 2009 CompuLab, Ltd.
 *
 * Author: Mike Rapoport <mike@compulab.co.il>
 *
 * Based of virtual consumer driver:
 *   Copyright 2008 Wolfson Microelectronics PLC.
 *   Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 */

#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/regulator/userspace-consumer.h>
#include <linux/slab.h>

struct userspace_consumer_data {
	const char *name;

	struct mutex lock;
	bool enabled;

	int num_supplies;
	struct regulator_bulk_data *supplies;
};

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

	return sprintf(buf, "%s\n", data->name);
}

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

	if (data->enabled)
		return sprintf(buf, "enabled\n");

	return sprintf(buf, "disabled\n");
}

static ssize_t state_store(struct device *dev, struct device_attribute *attr,
			   const char *buf, size_t count)
{
	struct userspace_consumer_data *data = dev_get_drvdata(dev);
	bool enabled;
	int ret;

	/*
	 * sysfs_streq() doesn't need the \n's, but we add them so the strings
	 * will be shared with show_state(), above.
	 */
	if (sysfs_streq(buf, "enabled\n") || sysfs_streq(buf, "1"))
		enabled = true;
	else if (sysfs_streq(buf, "disabled\n") || sysfs_streq(buf, "0"))
		enabled = false;
	else {
		dev_err(dev, "Configuring invalid mode\n");
		return count;
	}

	mutex_lock(&data->lock);
	if (enabled != data->enabled) {
		if (enabled)
			ret = regulator_bulk_enable(data->num_supplies,
						    data->supplies);
		else
			ret = regulator_bulk_disable(data->num_supplies,
						     data->supplies);

		if (ret == 0)
			data->enabled = enabled;
		else
			dev_err(dev, "Failed to configure state: %d\n", ret);
	}
	mutex_unlock(&data->lock);

	return count;
}

static DEVICE_ATTR_RO(name);
static DEVICE_ATTR_RW(state);

static struct attribute *attributes[] = {
	&dev_attr_name.attr,
	&dev_attr_state.attr,
	NULL,
};

static const struct attribute_group attr_group = {
	.attrs	= attributes,
};

static int regulator_userspace_consumer_probe(struct platform_device *pdev)
{
	struct regulator_userspace_consumer_data *pdata;
	struct userspace_consumer_data *drvdata;
	int ret;

	pdata = dev_get_platdata(&pdev->dev);
	if (!pdata)
		return -EINVAL;

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

	drvdata->name = pdata->name;
	drvdata->num_supplies = pdata->num_supplies;
	drvdata->supplies = pdata->supplies;

	mutex_init(&drvdata->lock);

	ret = devm_regulator_bulk_get(&pdev->dev, drvdata->num_supplies,
				      drvdata->supplies);
	if (ret) {
		dev_err(&pdev->dev, "Failed to get supplies: %d\n", ret);
		return ret;
	}

	ret = sysfs_create_group(&pdev->dev.kobj, &attr_group);
	if (ret != 0)
		return ret;

	if (pdata->init_on) {
		ret = regulator_bulk_enable(drvdata->num_supplies,
					    drvdata->supplies);
		if (ret) {
			dev_err(&pdev->dev,
				"Failed to set initial state: %d\n", ret);
			goto err_enable;
		}
	}

	drvdata->enabled = pdata->init_on;
	platform_set_drvdata(pdev, drvdata);

	return 0;

err_enable:
	sysfs_remove_group(&pdev->dev.kobj, &attr_group);

	return ret;
}

static int regulator_userspace_consumer_remove(struct platform_device *pdev)
{
	struct userspace_consumer_data *data = platform_get_drvdata(pdev);

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

	if (data->enabled)
		regulator_bulk_disable(data->num_supplies, data->supplies);

	return 0;
}

static struct platform_driver regulator_userspace_consumer_driver = {
	.probe		= regulator_userspace_consumer_probe,
	.remove		= regulator_userspace_consumer_remove,
	.driver		= {
		.name		= "reg-userspace-consumer",
	},
};

module_platform_driver(regulator_userspace_consumer_driver);

MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
MODULE_DESCRIPTION("Userspace consumer for voltage and current regulators");
MODULE_LICENSE("GPL");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1d98cccf MR	2	/*
	3	* userspace-consumer.c
	4	*
	5	* Copyright 2009 CompuLab, Ltd.
	6	*
	7	* Author: Mike Rapoport <mike@compulab.co.il>
	8	*
	9	* Based of virtual consumer driver:
	10	* Copyright 2008 Wolfson Microelectronics PLC.
	11	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
1d98cccf MR	12	*/
	13
	14	#include <linux/err.h>
	15	#include <linux/mutex.h>
65602c32	16	#include <linux/module.h>
1d98cccf MR	17	#include <linux/platform_device.h>
	18	#include <linux/regulator/consumer.h>
	19	#include <linux/regulator/userspace-consumer.h>
5a0e3ad6	20	#include <linux/slab.h>
1d98cccf MR	21
	22	struct userspace_consumer_data {
	23	const char *name;
	24
	25	struct mutex lock;
	26	bool enabled;
	27
	28	int num_supplies;
	29	struct regulator_bulk_data *supplies;
	30	};
	31
ba499a50 ZL	32	static ssize_t name_show(struct device *dev,
ba499a50 ZL	33	struct device_attribute attr, char buf)
1d98cccf MR	34	{
	35	struct userspace_consumer_data *data = dev_get_drvdata(dev);
	36
	37	return sprintf(buf, "%s\n", data->name);
	38	}
	39
ba499a50	40	static ssize_t state_show(struct device *dev,
1d98cccf MR	41	struct device_attribute attr, char buf)
	42	{
	43	struct userspace_consumer_data *data = dev_get_drvdata(dev);
	44
	45	if (data->enabled)
	46	return sprintf(buf, "enabled\n");
	47
	48	return sprintf(buf, "disabled\n");
	49	}
	50
ba499a50 ZL	51	static ssize_t state_store(struct device dev, struct device_attribute attr,
ba499a50 ZL	52	const char *buf, size_t count)
1d98cccf MR	53	{
	54	struct userspace_consumer_data *data = dev_get_drvdata(dev);
	55	bool enabled;
	56	int ret;
	57
	58	/*
	59	* sysfs_streq() doesn't need the \n's, but we add them so the strings
	60	* will be shared with show_state(), above.
	61	*/
	62	if (sysfs_streq(buf, "enabled\n") \|\| sysfs_streq(buf, "1"))
	63	enabled = true;
	64	else if (sysfs_streq(buf, "disabled\n") \|\| sysfs_streq(buf, "0"))
	65	enabled = false;
	66	else {
	67	dev_err(dev, "Configuring invalid mode\n");
	68	return count;
	69	}
	70
	71	mutex_lock(&data->lock);
	72	if (enabled != data->enabled) {
	73	if (enabled)
	74	ret = regulator_bulk_enable(data->num_supplies,
	75	data->supplies);
	76	else
	77	ret = regulator_bulk_disable(data->num_supplies,
	78	data->supplies);
	79
	80	if (ret == 0)
	81	data->enabled = enabled;
	82	else
	83	dev_err(dev, "Failed to configure state: %d\n", ret);
	84	}
	85	mutex_unlock(&data->lock);
	86
	87	return count;
	88	}
	89
ba499a50 ZL	90	static DEVICE_ATTR_RO(name);
ba499a50 ZL	91	static DEVICE_ATTR_RW(state);
1d98cccf	92
e9d62698 FB	93	static struct attribute *attributes[] = {
	94	&dev_attr_name.attr,
	95	&dev_attr_state.attr,
	96	NULL,
	97	};
	98
	99	static const struct attribute_group attr_group = {
	100	.attrs = attributes,
1d98cccf MR	101	};
	102
	103	static int regulator_userspace_consumer_probe(struct platform_device *pdev)
	104	{
	105	struct regulator_userspace_consumer_data *pdata;
	106	struct userspace_consumer_data *drvdata;
e9d62698	107	int ret;
1d98cccf	108
dff91d0b	109	pdata = dev_get_platdata(&pdev->dev);
1d98cccf MR	110	if (!pdata)
	111	return -EINVAL;
	112
5abe0c40 AL	113	drvdata = devm_kzalloc(&pdev->dev,
	114	sizeof(struct userspace_consumer_data),
	115	GFP_KERNEL);
1d98cccf MR	116	if (drvdata == NULL)
	117	return -ENOMEM;
	118
	119	drvdata->name = pdata->name;
	120	drvdata->num_supplies = pdata->num_supplies;
	121	drvdata->supplies = pdata->supplies;
	122
	123	mutex_init(&drvdata->lock);
	124
5abe0c40 AL	125	ret = devm_regulator_bulk_get(&pdev->dev, drvdata->num_supplies,
5abe0c40 AL	126	drvdata->supplies);
1d98cccf MR	127	if (ret) {
1d98cccf MR	128	dev_err(&pdev->dev, "Failed to get supplies: %d\n", ret);
5abe0c40	129	return ret;
1d98cccf MR	130	}
1d98cccf MR	131
e9d62698 FB	132	ret = sysfs_create_group(&pdev->dev.kobj, &attr_group);
e9d62698 FB	133	if (ret != 0)
5abe0c40	134	return ret;
1d98cccf	135
e9d62698	136	if (pdata->init_on) {
1d98cccf MR	137	ret = regulator_bulk_enable(drvdata->num_supplies,
1d98cccf MR	138	drvdata->supplies);
e9d62698 FB	139	if (ret) {
	140	dev_err(&pdev->dev,
	141	"Failed to set initial state: %d\n", ret);
	142	goto err_enable;
	143	}
1d98cccf MR	144	}
1d98cccf MR	145
e9d62698	146	drvdata->enabled = pdata->init_on;
1d98cccf MR	147	platform_set_drvdata(pdev, drvdata);
	148
	149	return 0;
	150
e9d62698 FB	151	err_enable:
e9d62698 FB	152	sysfs_remove_group(&pdev->dev.kobj, &attr_group);
1d98cccf	153
1d98cccf MR	154	return ret;
	155	}
	156
	157	static int regulator_userspace_consumer_remove(struct platform_device *pdev)
	158	{
	159	struct userspace_consumer_data *data = platform_get_drvdata(pdev);
1d98cccf	160
e9d62698	161	sysfs_remove_group(&pdev->dev.kobj, &attr_group);
1d98cccf MR	162
	163	if (data->enabled)
	164	regulator_bulk_disable(data->num_supplies, data->supplies);
	165
1d98cccf MR	166	return 0;
	167	}
	168
	169	static struct platform_driver regulator_userspace_consumer_driver = {
	170	.probe = regulator_userspace_consumer_probe,
	171	.remove = regulator_userspace_consumer_remove,
	172	.driver = {
	173	.name = "reg-userspace-consumer",
	174	},
	175	};
	176
005d610f	177	module_platform_driver(regulator_userspace_consumer_driver);
1d98cccf MR	178
	179	MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
	180	MODULE_DESCRIPTION("Userspace consumer for voltage and current regulators");
	181	MODULE_LICENSE("GPL");