1/*
  2 * userspace-consumer.c
  3 *
  4 * Copyright 2009 CompuLab, Ltd.
  5 *
  6 * Author: Mike Rapoport <mike@compulab.co.il>
  7 *
  8 * Based of virtual consumer driver:
  9 *   Copyright 2008 Wolfson Microelectronics PLC.
 10 *   Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 11 *
 12 * This program is free software; you can redistribute it and/or
 13 * modify it under the terms of the GNU General Public License as
 14 * published by the Free Software Foundation; either version 2 of the
 15 * License, or (at your option) any later version.
 16 *
 17 */
 18
 19#include <linux/err.h>
 20#include <linux/mutex.h>
 
 
 21#include <linux/platform_device.h>
 22#include <linux/regulator/consumer.h>
 23#include <linux/regulator/userspace-consumer.h>
 24#include <linux/slab.h>
 25
 26struct userspace_consumer_data {
 27	const char *name;
 28
 29	struct mutex lock;
 30	bool enabled;
 
 31
 32	int num_supplies;
 33	struct regulator_bulk_data *supplies;
 34};
 35
 36static ssize_t reg_show_name(struct device *dev,
 37			  struct device_attribute *attr, char *buf)
 38{
 39	struct userspace_consumer_data *data = dev_get_drvdata(dev);
 40
 41	return sprintf(buf, "%s\n", data->name);
 42}
 43
 44static ssize_t reg_show_state(struct device *dev,
 45			  struct device_attribute *attr, char *buf)
 46{
 47	struct userspace_consumer_data *data = dev_get_drvdata(dev);
 48
 49	if (data->enabled)
 50		return sprintf(buf, "enabled\n");
 51
 52	return sprintf(buf, "disabled\n");
 53}
 54
 55static ssize_t reg_set_state(struct device *dev, struct device_attribute *attr,
 56			 const char *buf, size_t count)
 57{
 58	struct userspace_consumer_data *data = dev_get_drvdata(dev);
 59	bool enabled;
 60	int ret;
 61
 62	/*
 63	 * sysfs_streq() doesn't need the \n's, but we add them so the strings
 64	 * will be shared with show_state(), above.
 65	 */
 66	if (sysfs_streq(buf, "enabled\n") || sysfs_streq(buf, "1"))
 67		enabled = true;
 68	else if (sysfs_streq(buf, "disabled\n") || sysfs_streq(buf, "0"))
 69		enabled = false;
 70	else {
 71		dev_err(dev, "Configuring invalid mode\n");
 72		return count;
 73	}
 74
 75	mutex_lock(&data->lock);
 76	if (enabled != data->enabled) {
 77		if (enabled)
 78			ret = regulator_bulk_enable(data->num_supplies,
 79						    data->supplies);
 80		else
 81			ret = regulator_bulk_disable(data->num_supplies,
 82						     data->supplies);
 83
 84		if (ret == 0)
 85			data->enabled = enabled;
 86		else
 87			dev_err(dev, "Failed to configure state: %d\n", ret);
 88	}
 89	mutex_unlock(&data->lock);
 90
 91	return count;
 92}
 93
 94static DEVICE_ATTR(name, 0444, reg_show_name, NULL);
 95static DEVICE_ATTR(state, 0644, reg_show_state, reg_set_state);
 96
 97static struct attribute *attributes[] = {
 98	&dev_attr_name.attr,
 99	&dev_attr_state.attr,
100	NULL,
101};
102
 
 
 
 
 
 
 
 
 
 
 
 
103static const struct attribute_group attr_group = {
104	.attrs	= attributes,
 
105};
106
107static int regulator_userspace_consumer_probe(struct platform_device *pdev)
108{
 
109	struct regulator_userspace_consumer_data *pdata;
110	struct userspace_consumer_data *drvdata;
111	int ret;
112
113	pdata = pdev->dev.platform_data;
114	if (!pdata)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
115		return -EINVAL;
 
116
117	drvdata = kzalloc(sizeof(struct userspace_consumer_data), GFP_KERNEL);
 
 
118	if (drvdata == NULL)
119		return -ENOMEM;
120
121	drvdata->name = pdata->name;
122	drvdata->num_supplies = pdata->num_supplies;
123	drvdata->supplies = pdata->supplies;
 
124
125	mutex_init(&drvdata->lock);
126
127	ret = regulator_bulk_get(&pdev->dev, drvdata->num_supplies,
128				 drvdata->supplies);
129	if (ret) {
130		dev_err(&pdev->dev, "Failed to get supplies: %d\n", ret);
131		goto err_alloc_supplies;
132	}
133
 
 
134	ret = sysfs_create_group(&pdev->dev.kobj, &attr_group);
135	if (ret != 0)
136		goto err_create_attrs;
137
138	if (pdata->init_on) {
139		ret = regulator_bulk_enable(drvdata->num_supplies,
140					    drvdata->supplies);
141		if (ret) {
142			dev_err(&pdev->dev,
143				"Failed to set initial state: %d\n", ret);
144			goto err_enable;
145		}
146	}
147
148	drvdata->enabled = pdata->init_on;
149	platform_set_drvdata(pdev, drvdata);
 
 
 
 
150
151	return 0;
152
153err_enable:
154	sysfs_remove_group(&pdev->dev.kobj, &attr_group);
155
156err_create_attrs:
157	regulator_bulk_free(drvdata->num_supplies, drvdata->supplies);
158
159err_alloc_supplies:
160	kfree(drvdata);
161	return ret;
162}
163
164static int regulator_userspace_consumer_remove(struct platform_device *pdev)
165{
166	struct userspace_consumer_data *data = platform_get_drvdata(pdev);
167
168	sysfs_remove_group(&pdev->dev.kobj, &attr_group);
169
170	if (data->enabled)
171		regulator_bulk_disable(data->num_supplies, data->supplies);
172
173	regulator_bulk_free(data->num_supplies, data->supplies);
174	kfree(data);
175
176	return 0;
177}
178
 
 
 
 
 
179static struct platform_driver regulator_userspace_consumer_driver = {
180	.probe		= regulator_userspace_consumer_probe,
181	.remove		= regulator_userspace_consumer_remove,
182	.driver		= {
183		.name		= "reg-userspace-consumer",
 
 
184	},
185};
186
187
188static int __init regulator_userspace_consumer_init(void)
189{
190	return platform_driver_register(&regulator_userspace_consumer_driver);
191}
192module_init(regulator_userspace_consumer_init);
193
194static void __exit regulator_userspace_consumer_exit(void)
195{
196	platform_driver_unregister(&regulator_userspace_consumer_driver);
197}
198module_exit(regulator_userspace_consumer_exit);
199
200MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
201MODULE_DESCRIPTION("Userspace consumer for voltage and current regulators");
202MODULE_LICENSE("GPL");

  1// SPDX-License-Identifier: GPL-2.0-or-later
  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>
 
 
 
 
 
 
 12 */
 13
 14#include <linux/err.h>
 15#include <linux/mutex.h>
 16#include <linux/module.h>
 17#include <linux/of.h>
 18#include <linux/platform_device.h>
 19#include <linux/regulator/consumer.h>
 20#include <linux/regulator/userspace-consumer.h>
 21#include <linux/slab.h>
 22
 23struct userspace_consumer_data {
 24	const char *name;
 25
 26	struct mutex lock;
 27	bool enabled;
 28	bool no_autoswitch;
 29
 30	int num_supplies;
 31	struct regulator_bulk_data *supplies;
 32};
 33
 34static ssize_t name_show(struct device *dev,
 35			 struct device_attribute *attr, char *buf)
 36{
 37	struct userspace_consumer_data *data = dev_get_drvdata(dev);
 38
 39	return sprintf(buf, "%s\n", data->name);
 40}
 41
 42static ssize_t state_show(struct device *dev,
 43			  struct device_attribute *attr, char *buf)
 44{
 45	struct userspace_consumer_data *data = dev_get_drvdata(dev);
 46
 47	if (data->enabled)
 48		return sprintf(buf, "enabled\n");
 49
 50	return sprintf(buf, "disabled\n");
 51}
 52
 53static ssize_t state_store(struct device *dev, struct device_attribute *attr,
 54			   const char *buf, size_t count)
 55{
 56	struct userspace_consumer_data *data = dev_get_drvdata(dev);
 57	bool enabled;
 58	int ret;
 59
 60	/*
 61	 * sysfs_streq() doesn't need the \n's, but we add them so the strings
 62	 * will be shared with show_state(), above.
 63	 */
 64	if (sysfs_streq(buf, "enabled\n") || sysfs_streq(buf, "1"))
 65		enabled = true;
 66	else if (sysfs_streq(buf, "disabled\n") || sysfs_streq(buf, "0"))
 67		enabled = false;
 68	else {
 69		dev_err(dev, "Configuring invalid mode\n");
 70		return count;
 71	}
 72
 73	mutex_lock(&data->lock);
 74	if (enabled != data->enabled) {
 75		if (enabled)
 76			ret = regulator_bulk_enable(data->num_supplies,
 77						    data->supplies);
 78		else
 79			ret = regulator_bulk_disable(data->num_supplies,
 80						     data->supplies);
 81
 82		if (ret == 0)
 83			data->enabled = enabled;
 84		else
 85			dev_err(dev, "Failed to configure state: %d\n", ret);
 86	}
 87	mutex_unlock(&data->lock);
 88
 89	return count;
 90}
 91
 92static DEVICE_ATTR_RO(name);
 93static DEVICE_ATTR_RW(state);
 94
 95static struct attribute *attributes[] = {
 96	&dev_attr_name.attr,
 97	&dev_attr_state.attr,
 98	NULL,
 99};
100
101static umode_t attr_visible(struct kobject *kobj, struct attribute *attr, int idx)
102{
103	struct device *dev = kobj_to_dev(kobj);
104	struct userspace_consumer_data *data = dev_get_drvdata(dev);
105
106	/* If a name hasn't been set, don't bother with the attribute */
107	if (attr == &dev_attr_name.attr && !data->name)
108		return 0;
109
110	return attr->mode;
111}
112
113static const struct attribute_group attr_group = {
114	.attrs	= attributes,
115	.is_visible =  attr_visible,
116};
117
118static int regulator_userspace_consumer_probe(struct platform_device *pdev)
119{
120	struct regulator_userspace_consumer_data tmpdata;
121	struct regulator_userspace_consumer_data *pdata;
122	struct userspace_consumer_data *drvdata;
123	int ret;
124
125	pdata = dev_get_platdata(&pdev->dev);
126	if (!pdata) {
127		if (!pdev->dev.of_node)
128			return -EINVAL;
129
130		pdata = &tmpdata;
131		memset(pdata, 0, sizeof(*pdata));
132
133		pdata->no_autoswitch = true;
134		pdata->num_supplies = 1;
135		pdata->supplies = devm_kzalloc(&pdev->dev, sizeof(*pdata->supplies), GFP_KERNEL);
136		if (!pdata->supplies)
137			return -ENOMEM;
138		pdata->supplies[0].supply = "vout";
139	}
140
141	if (pdata->num_supplies < 1) {
142		dev_err(&pdev->dev, "At least one supply required\n");
143		return -EINVAL;
144	}
145
146	drvdata = devm_kzalloc(&pdev->dev,
147			       sizeof(struct userspace_consumer_data),
148			       GFP_KERNEL);
149	if (drvdata == NULL)
150		return -ENOMEM;
151
152	drvdata->name = pdata->name;
153	drvdata->num_supplies = pdata->num_supplies;
154	drvdata->supplies = pdata->supplies;
155	drvdata->no_autoswitch = pdata->no_autoswitch;
156
157	mutex_init(&drvdata->lock);
158
159	ret = devm_regulator_bulk_get_exclusive(&pdev->dev, drvdata->num_supplies,
160						drvdata->supplies);
161	if (ret) {
162		dev_err(&pdev->dev, "Failed to get supplies: %d\n", ret);
163		return ret;
164	}
165
166	platform_set_drvdata(pdev, drvdata);
167
168	ret = sysfs_create_group(&pdev->dev.kobj, &attr_group);
169	if (ret != 0)
170		return ret;
171
172	if (pdata->init_on && !pdata->no_autoswitch) {
173		ret = regulator_bulk_enable(drvdata->num_supplies,
174					    drvdata->supplies);
175		if (ret) {
176			dev_err(&pdev->dev,
177				"Failed to set initial state: %d\n", ret);
178			goto err_enable;
179		}
180	}
181
182	ret = regulator_is_enabled(pdata->supplies[0].consumer);
183	if (ret < 0) {
184		dev_err(&pdev->dev, "Failed to get regulator status\n");
185		goto err_enable;
186	}
187	drvdata->enabled = !!ret;
188
189	return 0;
190
191err_enable:
192	sysfs_remove_group(&pdev->dev.kobj, &attr_group);
193
 
 
 
 
 
194	return ret;
195}
196
197static void regulator_userspace_consumer_remove(struct platform_device *pdev)
198{
199	struct userspace_consumer_data *data = platform_get_drvdata(pdev);
200
201	sysfs_remove_group(&pdev->dev.kobj, &attr_group);
202
203	if (data->enabled && !data->no_autoswitch)
204		regulator_bulk_disable(data->num_supplies, data->supplies);
 
 
 
 
 
205}
206
207static const struct of_device_id regulator_userspace_consumer_of_match[] = {
208	{ .compatible = "regulator-output", },
209	{},
210};
211
212static struct platform_driver regulator_userspace_consumer_driver = {
213	.probe		= regulator_userspace_consumer_probe,
214	.remove_new	= regulator_userspace_consumer_remove,
215	.driver		= {
216		.name		= "reg-userspace-consumer",
217		.probe_type	= PROBE_PREFER_ASYNCHRONOUS,
218		.of_match_table	= regulator_userspace_consumer_of_match,
219	},
220};
221
222module_platform_driver(regulator_userspace_consumer_driver);
 
 
 
 
 
 
 
 
 
 
 
223
224MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
225MODULE_DESCRIPTION("Userspace consumer for voltage and current regulators");
226MODULE_LICENSE("GPL");