4 * Copyright 2009 CompuLab, Ltd.
6 * Author: Mike Rapoport <mike@compulab.co.il>
8 * Based of virtual consumer driver:
9 * Copyright 2008 Wolfson Microelectronics PLC.
10 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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.
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>
26 struct userspace_consumer_data {
33 struct regulator_bulk_data *supplies;
36 static ssize_t reg_show_name(struct device *dev,
37 struct device_attribute *attr, char *buf)
39 struct userspace_consumer_data *data = dev_get_drvdata(dev);
41 return sprintf(buf, "%s\n", data->name);
44 static ssize_t reg_show_state(struct device *dev,
45 struct device_attribute *attr, char *buf)
47 struct userspace_consumer_data *data = dev_get_drvdata(dev);
50 return sprintf(buf, "enabled\n");
52 return sprintf(buf, "disabled\n");
55 static ssize_t reg_set_state(struct device *dev, struct device_attribute *attr,
56 const char *buf, size_t count)
58 struct userspace_consumer_data *data = dev_get_drvdata(dev);
63 * sysfs_streq() doesn't need the \n's, but we add them so the strings
64 * will be shared with show_state(), above.
66 if (sysfs_streq(buf, "enabled\n") || sysfs_streq(buf, "1"))
68 else if (sysfs_streq(buf, "disabled\n") || sysfs_streq(buf, "0"))
71 dev_err(dev, "Configuring invalid mode\n");
75 mutex_lock(&data->lock);
76 if (enabled != data->enabled) {
78 ret = regulator_bulk_enable(data->num_supplies,
81 ret = regulator_bulk_disable(data->num_supplies,
85 data->enabled = enabled;
87 dev_err(dev, "Failed to configure state: %d\n", ret);
89 mutex_unlock(&data->lock);
94 static DEVICE_ATTR(name, 0444, reg_show_name, NULL);
95 static DEVICE_ATTR(state, 0644, reg_show_state, reg_set_state);
97 static struct attribute *attributes[] = {
103 static const struct attribute_group attr_group = {
107 static int regulator_userspace_consumer_probe(struct platform_device *pdev)
109 struct regulator_userspace_consumer_data *pdata;
110 struct userspace_consumer_data *drvdata;
113 pdata = pdev->dev.platform_data;
117 drvdata = kzalloc(sizeof(struct userspace_consumer_data), GFP_KERNEL);
121 drvdata->name = pdata->name;
122 drvdata->num_supplies = pdata->num_supplies;
123 drvdata->supplies = pdata->supplies;
125 mutex_init(&drvdata->lock);
127 ret = regulator_bulk_get(&pdev->dev, drvdata->num_supplies,
130 dev_err(&pdev->dev, "Failed to get supplies: %d\n", ret);
131 goto err_alloc_supplies;
134 ret = sysfs_create_group(&pdev->dev.kobj, &attr_group);
136 goto err_create_attrs;
138 if (pdata->init_on) {
139 ret = regulator_bulk_enable(drvdata->num_supplies,
143 "Failed to set initial state: %d\n", ret);
148 drvdata->enabled = pdata->init_on;
149 platform_set_drvdata(pdev, drvdata);
154 sysfs_remove_group(&pdev->dev.kobj, &attr_group);
157 regulator_bulk_free(drvdata->num_supplies, drvdata->supplies);
164 static int regulator_userspace_consumer_remove(struct platform_device *pdev)
166 struct userspace_consumer_data *data = platform_get_drvdata(pdev);
168 sysfs_remove_group(&pdev->dev.kobj, &attr_group);
171 regulator_bulk_disable(data->num_supplies, data->supplies);
173 regulator_bulk_free(data->num_supplies, data->supplies);
179 static struct platform_driver regulator_userspace_consumer_driver = {
180 .probe = regulator_userspace_consumer_probe,
181 .remove = regulator_userspace_consumer_remove,
183 .name = "reg-userspace-consumer",
188 static int __init regulator_userspace_consumer_init(void)
190 return platform_driver_register(®ulator_userspace_consumer_driver);
192 module_init(regulator_userspace_consumer_init);
194 static void __exit regulator_userspace_consumer_exit(void)
196 platform_driver_unregister(®ulator_userspace_consumer_driver);
198 module_exit(regulator_userspace_consumer_exit);
200 MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
201 MODULE_DESCRIPTION("Userspace consumer for voltage and current regulators");
202 MODULE_LICENSE("GPL");