2 * reg-virtual-consumer.c
4 * Copyright 2008 Wolfson Microelectronics PLC.
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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.
14 #include <linux/err.h>
15 #include <linux/mutex.h>
16 #include <linux/platform_device.h>
17 #include <linux/regulator/consumer.h>
18 #include <linux/slab.h>
20 struct virtual_consumer_data {
22 struct regulator *regulator;
31 static void update_voltage_constraints(struct device *dev,
32 struct virtual_consumer_data *data)
36 if (data->min_uV && data->max_uV
37 && data->min_uV <= data->max_uV) {
38 dev_dbg(dev, "Requesting %d-%duV\n",
39 data->min_uV, data->max_uV);
40 ret = regulator_set_voltage(data->regulator,
41 data->min_uV, data->max_uV);
44 "regulator_set_voltage() failed: %d\n", ret);
49 if (data->min_uV && data->max_uV && !data->enabled) {
50 dev_dbg(dev, "Enabling regulator\n");
51 ret = regulator_enable(data->regulator);
55 dev_err(dev, "regulator_enable() failed: %d\n",
59 if (!(data->min_uV && data->max_uV) && data->enabled) {
60 dev_dbg(dev, "Disabling regulator\n");
61 ret = regulator_disable(data->regulator);
63 data->enabled = false;
65 dev_err(dev, "regulator_disable() failed: %d\n",
70 static void update_current_limit_constraints(struct device *dev,
71 struct virtual_consumer_data *data)
76 && data->min_uA <= data->max_uA) {
77 dev_dbg(dev, "Requesting %d-%duA\n",
78 data->min_uA, data->max_uA);
79 ret = regulator_set_current_limit(data->regulator,
80 data->min_uA, data->max_uA);
83 "regulator_set_current_limit() failed: %d\n",
89 if (data->max_uA && !data->enabled) {
90 dev_dbg(dev, "Enabling regulator\n");
91 ret = regulator_enable(data->regulator);
95 dev_err(dev, "regulator_enable() failed: %d\n",
99 if (!(data->min_uA && data->max_uA) && data->enabled) {
100 dev_dbg(dev, "Disabling regulator\n");
101 ret = regulator_disable(data->regulator);
103 data->enabled = false;
105 dev_err(dev, "regulator_disable() failed: %d\n",
110 static ssize_t show_min_uV(struct device *dev,
111 struct device_attribute *attr, char *buf)
113 struct virtual_consumer_data *data = dev_get_drvdata(dev);
114 return sprintf(buf, "%d\n", data->min_uV);
117 static ssize_t set_min_uV(struct device *dev, struct device_attribute *attr,
118 const char *buf, size_t count)
120 struct virtual_consumer_data *data = dev_get_drvdata(dev);
123 if (strict_strtol(buf, 10, &val) != 0)
126 mutex_lock(&data->lock);
129 update_voltage_constraints(dev, data);
131 mutex_unlock(&data->lock);
136 static ssize_t show_max_uV(struct device *dev,
137 struct device_attribute *attr, char *buf)
139 struct virtual_consumer_data *data = dev_get_drvdata(dev);
140 return sprintf(buf, "%d\n", data->max_uV);
143 static ssize_t set_max_uV(struct device *dev, struct device_attribute *attr,
144 const char *buf, size_t count)
146 struct virtual_consumer_data *data = dev_get_drvdata(dev);
149 if (strict_strtol(buf, 10, &val) != 0)
152 mutex_lock(&data->lock);
155 update_voltage_constraints(dev, data);
157 mutex_unlock(&data->lock);
162 static ssize_t show_min_uA(struct device *dev,
163 struct device_attribute *attr, char *buf)
165 struct virtual_consumer_data *data = dev_get_drvdata(dev);
166 return sprintf(buf, "%d\n", data->min_uA);
169 static ssize_t set_min_uA(struct device *dev, struct device_attribute *attr,
170 const char *buf, size_t count)
172 struct virtual_consumer_data *data = dev_get_drvdata(dev);
175 if (strict_strtol(buf, 10, &val) != 0)
178 mutex_lock(&data->lock);
181 update_current_limit_constraints(dev, data);
183 mutex_unlock(&data->lock);
188 static ssize_t show_max_uA(struct device *dev,
189 struct device_attribute *attr, char *buf)
191 struct virtual_consumer_data *data = dev_get_drvdata(dev);
192 return sprintf(buf, "%d\n", data->max_uA);
195 static ssize_t set_max_uA(struct device *dev, struct device_attribute *attr,
196 const char *buf, size_t count)
198 struct virtual_consumer_data *data = dev_get_drvdata(dev);
201 if (strict_strtol(buf, 10, &val) != 0)
204 mutex_lock(&data->lock);
207 update_current_limit_constraints(dev, data);
209 mutex_unlock(&data->lock);
214 static ssize_t show_mode(struct device *dev,
215 struct device_attribute *attr, char *buf)
217 struct virtual_consumer_data *data = dev_get_drvdata(dev);
219 switch (data->mode) {
220 case REGULATOR_MODE_FAST:
221 return sprintf(buf, "fast\n");
222 case REGULATOR_MODE_NORMAL:
223 return sprintf(buf, "normal\n");
224 case REGULATOR_MODE_IDLE:
225 return sprintf(buf, "idle\n");
226 case REGULATOR_MODE_STANDBY:
227 return sprintf(buf, "standby\n");
229 return sprintf(buf, "unknown\n");
233 static ssize_t set_mode(struct device *dev, struct device_attribute *attr,
234 const char *buf, size_t count)
236 struct virtual_consumer_data *data = dev_get_drvdata(dev);
241 * sysfs_streq() doesn't need the \n's, but we add them so the strings
242 * will be shared with show_mode(), above.
244 if (sysfs_streq(buf, "fast\n"))
245 mode = REGULATOR_MODE_FAST;
246 else if (sysfs_streq(buf, "normal\n"))
247 mode = REGULATOR_MODE_NORMAL;
248 else if (sysfs_streq(buf, "idle\n"))
249 mode = REGULATOR_MODE_IDLE;
250 else if (sysfs_streq(buf, "standby\n"))
251 mode = REGULATOR_MODE_STANDBY;
253 dev_err(dev, "Configuring invalid mode\n");
257 mutex_lock(&data->lock);
258 ret = regulator_set_mode(data->regulator, mode);
262 dev_err(dev, "Failed to configure mode: %d\n", ret);
263 mutex_unlock(&data->lock);
268 static DEVICE_ATTR(min_microvolts, 0666, show_min_uV, set_min_uV);
269 static DEVICE_ATTR(max_microvolts, 0666, show_max_uV, set_max_uV);
270 static DEVICE_ATTR(min_microamps, 0666, show_min_uA, set_min_uA);
271 static DEVICE_ATTR(max_microamps, 0666, show_max_uA, set_max_uA);
272 static DEVICE_ATTR(mode, 0666, show_mode, set_mode);
274 static struct attribute *regulator_virtual_attributes[] = {
275 &dev_attr_min_microvolts.attr,
276 &dev_attr_max_microvolts.attr,
277 &dev_attr_min_microamps.attr,
278 &dev_attr_max_microamps.attr,
283 static const struct attribute_group regulator_virtual_attr_group = {
284 .attrs = regulator_virtual_attributes,
287 static int __devinit regulator_virtual_probe(struct platform_device *pdev)
289 char *reg_id = pdev->dev.platform_data;
290 struct virtual_consumer_data *drvdata;
293 drvdata = kzalloc(sizeof(struct virtual_consumer_data), GFP_KERNEL);
297 mutex_init(&drvdata->lock);
299 drvdata->regulator = regulator_get(&pdev->dev, reg_id);
300 if (IS_ERR(drvdata->regulator)) {
301 ret = PTR_ERR(drvdata->regulator);
302 dev_err(&pdev->dev, "Failed to obtain supply '%s': %d\n",
307 ret = sysfs_create_group(&pdev->dev.kobj,
308 ®ulator_virtual_attr_group);
311 "Failed to create attribute group: %d\n", ret);
315 drvdata->mode = regulator_get_mode(drvdata->regulator);
317 platform_set_drvdata(pdev, drvdata);
322 regulator_put(drvdata->regulator);
328 static int __devexit regulator_virtual_remove(struct platform_device *pdev)
330 struct virtual_consumer_data *drvdata = platform_get_drvdata(pdev);
332 sysfs_remove_group(&pdev->dev.kobj, ®ulator_virtual_attr_group);
334 if (drvdata->enabled)
335 regulator_disable(drvdata->regulator);
336 regulator_put(drvdata->regulator);
340 platform_set_drvdata(pdev, NULL);
345 static struct platform_driver regulator_virtual_consumer_driver = {
346 .probe = regulator_virtual_probe,
347 .remove = __devexit_p(regulator_virtual_remove),
349 .name = "reg-virt-consumer",
350 .owner = THIS_MODULE,
354 static int __init regulator_virtual_consumer_init(void)
356 return platform_driver_register(®ulator_virtual_consumer_driver);
358 module_init(regulator_virtual_consumer_init);
360 static void __exit regulator_virtual_consumer_exit(void)
362 platform_driver_unregister(®ulator_virtual_consumer_driver);
364 module_exit(regulator_virtual_consumer_exit);
366 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
367 MODULE_DESCRIPTION("Virtual regulator consumer");
368 MODULE_LICENSE("GPL");
369 MODULE_ALIAS("platform:reg-virt-consumer");