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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>
18#include <linux/slab.h>
19
20struct virtual_consumer_data {
21 struct mutex lock;
22 struct regulator *regulator;
23 bool enabled;
24 int min_uV;
25 int max_uV;
26 int min_uA;
27 int max_uA;
28 unsigned int mode;
29};
30
31static void update_voltage_constraints(struct device *dev,
32 struct virtual_consumer_data *data)
33{
34 int ret;
35
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);
42 if (ret != 0) {
43 dev_err(dev,
44 "regulator_set_voltage() failed: %d\n", ret);
45 return;
46 }
47 }
48
49 if (data->min_uV && data->max_uV && !data->enabled) {
50 dev_dbg(dev, "Enabling regulator\n");
51 ret = regulator_enable(data->regulator);
52 if (ret == 0)
53 data->enabled = true;
54 else
55 dev_err(dev, "regulator_enable() failed: %d\n",
56 ret);
57 }
58
59 if (!(data->min_uV && data->max_uV) && data->enabled) {
60 dev_dbg(dev, "Disabling regulator\n");
61 ret = regulator_disable(data->regulator);
62 if (ret == 0)
63 data->enabled = false;
64 else
65 dev_err(dev, "regulator_disable() failed: %d\n",
66 ret);
67 }
68}
69
70static void update_current_limit_constraints(struct device *dev,
71 struct virtual_consumer_data *data)
72{
73 int ret;
74
75 if (data->max_uA
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);
81 if (ret != 0) {
82 dev_err(dev,
83 "regulator_set_current_limit() failed: %d\n",
84 ret);
85 return;
86 }
87 }
88
89 if (data->max_uA && !data->enabled) {
90 dev_dbg(dev, "Enabling regulator\n");
91 ret = regulator_enable(data->regulator);
92 if (ret == 0)
93 data->enabled = true;
94 else
95 dev_err(dev, "regulator_enable() failed: %d\n",
96 ret);
97 }
98
99 if (!(data->min_uA && data->max_uA) && data->enabled) {
100 dev_dbg(dev, "Disabling regulator\n");
101 ret = regulator_disable(data->regulator);
102 if (ret == 0)
103 data->enabled = false;
104 else
105 dev_err(dev, "regulator_disable() failed: %d\n",
106 ret);
107 }
108}
109
110static ssize_t show_min_uV(struct device *dev,
111 struct device_attribute *attr, char *buf)
112{
113 struct virtual_consumer_data *data = dev_get_drvdata(dev);
114 return sprintf(buf, "%d\n", data->min_uV);
115}
116
117static ssize_t set_min_uV(struct device *dev, struct device_attribute *attr,
118 const char *buf, size_t count)
119{
120 struct virtual_consumer_data *data = dev_get_drvdata(dev);
121 long val;
122
123 if (strict_strtol(buf, 10, &val) != 0)
124 return count;
125
126 mutex_lock(&data->lock);
127
128 data->min_uV = val;
129 update_voltage_constraints(dev, data);
130
131 mutex_unlock(&data->lock);
132
133 return count;
134}
135
136static ssize_t show_max_uV(struct device *dev,
137 struct device_attribute *attr, char *buf)
138{
139 struct virtual_consumer_data *data = dev_get_drvdata(dev);
140 return sprintf(buf, "%d\n", data->max_uV);
141}
142
143static ssize_t set_max_uV(struct device *dev, struct device_attribute *attr,
144 const char *buf, size_t count)
145{
146 struct virtual_consumer_data *data = dev_get_drvdata(dev);
147 long val;
148
149 if (strict_strtol(buf, 10, &val) != 0)
150 return count;
151
152 mutex_lock(&data->lock);
153
154 data->max_uV = val;
155 update_voltage_constraints(dev, data);
156
157 mutex_unlock(&data->lock);
158
159 return count;
160}
161
162static ssize_t show_min_uA(struct device *dev,
163 struct device_attribute *attr, char *buf)
164{
165 struct virtual_consumer_data *data = dev_get_drvdata(dev);
166 return sprintf(buf, "%d\n", data->min_uA);
167}
168
169static ssize_t set_min_uA(struct device *dev, struct device_attribute *attr,
170 const char *buf, size_t count)
171{
172 struct virtual_consumer_data *data = dev_get_drvdata(dev);
173 long val;
174
175 if (strict_strtol(buf, 10, &val) != 0)
176 return count;
177
178 mutex_lock(&data->lock);
179
180 data->min_uA = val;
181 update_current_limit_constraints(dev, data);
182
183 mutex_unlock(&data->lock);
184
185 return count;
186}
187
188static ssize_t show_max_uA(struct device *dev,
189 struct device_attribute *attr, char *buf)
190{
191 struct virtual_consumer_data *data = dev_get_drvdata(dev);
192 return sprintf(buf, "%d\n", data->max_uA);
193}
194
195static ssize_t set_max_uA(struct device *dev, struct device_attribute *attr,
196 const char *buf, size_t count)
197{
198 struct virtual_consumer_data *data = dev_get_drvdata(dev);
199 long val;
200
201 if (strict_strtol(buf, 10, &val) != 0)
202 return count;
203
204 mutex_lock(&data->lock);
205
206 data->max_uA = val;
207 update_current_limit_constraints(dev, data);
208
209 mutex_unlock(&data->lock);
210
211 return count;
212}
213
214static ssize_t show_mode(struct device *dev,
215 struct device_attribute *attr, char *buf)
216{
217 struct virtual_consumer_data *data = dev_get_drvdata(dev);
218
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");
228 default:
229 return sprintf(buf, "unknown\n");
230 }
231}
232
233static ssize_t set_mode(struct device *dev, struct device_attribute *attr,
234 const char *buf, size_t count)
235{
236 struct virtual_consumer_data *data = dev_get_drvdata(dev);
237 unsigned int mode;
238 int ret;
239
240 /*
241 * sysfs_streq() doesn't need the \n's, but we add them so the strings
242 * will be shared with show_mode(), above.
243 */
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;
252 else {
253 dev_err(dev, "Configuring invalid mode\n");
254 return count;
255 }
256
257 mutex_lock(&data->lock);
258 ret = regulator_set_mode(data->regulator, mode);
259 if (ret == 0)
260 data->mode = mode;
261 else
262 dev_err(dev, "Failed to configure mode: %d\n", ret);
263 mutex_unlock(&data->lock);
264
265 return count;
266}
267
268static DEVICE_ATTR(min_microvolts, 0666, show_min_uV, set_min_uV);
269static DEVICE_ATTR(max_microvolts, 0666, show_max_uV, set_max_uV);
270static DEVICE_ATTR(min_microamps, 0666, show_min_uA, set_min_uA);
271static DEVICE_ATTR(max_microamps, 0666, show_max_uA, set_max_uA);
272static DEVICE_ATTR(mode, 0666, show_mode, set_mode);
273
274static 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,
279 &dev_attr_mode.attr,
280 NULL
281};
282
283static const struct attribute_group regulator_virtual_attr_group = {
284 .attrs = regulator_virtual_attributes,
285};
286
287static int __devinit regulator_virtual_probe(struct platform_device *pdev)
288{
289 char *reg_id = pdev->dev.platform_data;
290 struct virtual_consumer_data *drvdata;
291 int ret;
292
293 drvdata = kzalloc(sizeof(struct virtual_consumer_data), GFP_KERNEL);
294 if (drvdata == NULL)
295 return -ENOMEM;
296
297 mutex_init(&drvdata->lock);
298
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",
303 reg_id, ret);
304 goto err;
305 }
306
307 ret = sysfs_create_group(&pdev->dev.kobj,
308 ®ulator_virtual_attr_group);
309 if (ret != 0) {
310 dev_err(&pdev->dev,
311 "Failed to create attribute group: %d\n", ret);
312 goto err_regulator;
313 }
314
315 drvdata->mode = regulator_get_mode(drvdata->regulator);
316
317 platform_set_drvdata(pdev, drvdata);
318
319 return 0;
320
321err_regulator:
322 regulator_put(drvdata->regulator);
323err:
324 kfree(drvdata);
325 return ret;
326}
327
328static int __devexit regulator_virtual_remove(struct platform_device *pdev)
329{
330 struct virtual_consumer_data *drvdata = platform_get_drvdata(pdev);
331
332 sysfs_remove_group(&pdev->dev.kobj, ®ulator_virtual_attr_group);
333
334 if (drvdata->enabled)
335 regulator_disable(drvdata->regulator);
336 regulator_put(drvdata->regulator);
337
338 kfree(drvdata);
339
340 platform_set_drvdata(pdev, NULL);
341
342 return 0;
343}
344
345static struct platform_driver regulator_virtual_consumer_driver = {
346 .probe = regulator_virtual_probe,
347 .remove = __devexit_p(regulator_virtual_remove),
348 .driver = {
349 .name = "reg-virt-consumer",
350 .owner = THIS_MODULE,
351 },
352};
353
354static int __init regulator_virtual_consumer_init(void)
355{
356 return platform_driver_register(®ulator_virtual_consumer_driver);
357}
358module_init(regulator_virtual_consumer_init);
359
360static void __exit regulator_virtual_consumer_exit(void)
361{
362 platform_driver_unregister(®ulator_virtual_consumer_driver);
363}
364module_exit(regulator_virtual_consumer_exit);
365
366MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
367MODULE_DESCRIPTION("Virtual regulator consumer");
368MODULE_LICENSE("GPL");
369MODULE_ALIAS("platform:reg-virt-consumer");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * reg-virtual-consumer.c
4 *
5 * Copyright 2008 Wolfson Microelectronics PLC.
6 *
7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8 */
9
10#include <linux/err.h>
11#include <linux/mutex.h>
12#include <linux/platform_device.h>
13#include <linux/regulator/consumer.h>
14#include <linux/slab.h>
15#include <linux/module.h>
16#include <linux/of.h>
17
18struct virtual_consumer_data {
19 struct mutex lock;
20 struct regulator *regulator;
21 bool enabled;
22 int min_uV;
23 int max_uV;
24 int min_uA;
25 int max_uA;
26 unsigned int mode;
27};
28
29static void update_voltage_constraints(struct device *dev,
30 struct virtual_consumer_data *data)
31{
32 int ret;
33
34 if (data->min_uV && data->max_uV
35 && data->min_uV <= data->max_uV) {
36 dev_dbg(dev, "Requesting %d-%duV\n",
37 data->min_uV, data->max_uV);
38 ret = regulator_set_voltage(data->regulator,
39 data->min_uV, data->max_uV);
40 if (ret != 0) {
41 dev_err(dev,
42 "regulator_set_voltage() failed: %d\n", ret);
43 return;
44 }
45 }
46
47 if (data->min_uV && data->max_uV && !data->enabled) {
48 dev_dbg(dev, "Enabling regulator\n");
49 ret = regulator_enable(data->regulator);
50 if (ret == 0)
51 data->enabled = true;
52 else
53 dev_err(dev, "regulator_enable() failed: %d\n",
54 ret);
55 }
56
57 if (!(data->min_uV && data->max_uV) && data->enabled) {
58 dev_dbg(dev, "Disabling regulator\n");
59 ret = regulator_disable(data->regulator);
60 if (ret == 0)
61 data->enabled = false;
62 else
63 dev_err(dev, "regulator_disable() failed: %d\n",
64 ret);
65 }
66}
67
68static void update_current_limit_constraints(struct device *dev,
69 struct virtual_consumer_data *data)
70{
71 int ret;
72
73 if (data->max_uA
74 && data->min_uA <= data->max_uA) {
75 dev_dbg(dev, "Requesting %d-%duA\n",
76 data->min_uA, data->max_uA);
77 ret = regulator_set_current_limit(data->regulator,
78 data->min_uA, data->max_uA);
79 if (ret != 0) {
80 dev_err(dev,
81 "regulator_set_current_limit() failed: %d\n",
82 ret);
83 return;
84 }
85 }
86
87 if (data->max_uA && !data->enabled) {
88 dev_dbg(dev, "Enabling regulator\n");
89 ret = regulator_enable(data->regulator);
90 if (ret == 0)
91 data->enabled = true;
92 else
93 dev_err(dev, "regulator_enable() failed: %d\n",
94 ret);
95 }
96
97 if (!(data->min_uA && data->max_uA) && data->enabled) {
98 dev_dbg(dev, "Disabling regulator\n");
99 ret = regulator_disable(data->regulator);
100 if (ret == 0)
101 data->enabled = false;
102 else
103 dev_err(dev, "regulator_disable() failed: %d\n",
104 ret);
105 }
106}
107
108static ssize_t show_min_uV(struct device *dev,
109 struct device_attribute *attr, char *buf)
110{
111 struct virtual_consumer_data *data = dev_get_drvdata(dev);
112 return sprintf(buf, "%d\n", data->min_uV);
113}
114
115static ssize_t set_min_uV(struct device *dev, struct device_attribute *attr,
116 const char *buf, size_t count)
117{
118 struct virtual_consumer_data *data = dev_get_drvdata(dev);
119 long val;
120
121 if (kstrtol(buf, 10, &val) != 0)
122 return count;
123
124 mutex_lock(&data->lock);
125
126 data->min_uV = val;
127 update_voltage_constraints(dev, data);
128
129 mutex_unlock(&data->lock);
130
131 return count;
132}
133
134static ssize_t show_max_uV(struct device *dev,
135 struct device_attribute *attr, char *buf)
136{
137 struct virtual_consumer_data *data = dev_get_drvdata(dev);
138 return sprintf(buf, "%d\n", data->max_uV);
139}
140
141static ssize_t set_max_uV(struct device *dev, struct device_attribute *attr,
142 const char *buf, size_t count)
143{
144 struct virtual_consumer_data *data = dev_get_drvdata(dev);
145 long val;
146
147 if (kstrtol(buf, 10, &val) != 0)
148 return count;
149
150 mutex_lock(&data->lock);
151
152 data->max_uV = val;
153 update_voltage_constraints(dev, data);
154
155 mutex_unlock(&data->lock);
156
157 return count;
158}
159
160static ssize_t show_min_uA(struct device *dev,
161 struct device_attribute *attr, char *buf)
162{
163 struct virtual_consumer_data *data = dev_get_drvdata(dev);
164 return sprintf(buf, "%d\n", data->min_uA);
165}
166
167static ssize_t set_min_uA(struct device *dev, struct device_attribute *attr,
168 const char *buf, size_t count)
169{
170 struct virtual_consumer_data *data = dev_get_drvdata(dev);
171 long val;
172
173 if (kstrtol(buf, 10, &val) != 0)
174 return count;
175
176 mutex_lock(&data->lock);
177
178 data->min_uA = val;
179 update_current_limit_constraints(dev, data);
180
181 mutex_unlock(&data->lock);
182
183 return count;
184}
185
186static ssize_t show_max_uA(struct device *dev,
187 struct device_attribute *attr, char *buf)
188{
189 struct virtual_consumer_data *data = dev_get_drvdata(dev);
190 return sprintf(buf, "%d\n", data->max_uA);
191}
192
193static ssize_t set_max_uA(struct device *dev, struct device_attribute *attr,
194 const char *buf, size_t count)
195{
196 struct virtual_consumer_data *data = dev_get_drvdata(dev);
197 long val;
198
199 if (kstrtol(buf, 10, &val) != 0)
200 return count;
201
202 mutex_lock(&data->lock);
203
204 data->max_uA = val;
205 update_current_limit_constraints(dev, data);
206
207 mutex_unlock(&data->lock);
208
209 return count;
210}
211
212static ssize_t show_mode(struct device *dev,
213 struct device_attribute *attr, char *buf)
214{
215 struct virtual_consumer_data *data = dev_get_drvdata(dev);
216
217 switch (data->mode) {
218 case REGULATOR_MODE_FAST:
219 return sprintf(buf, "fast\n");
220 case REGULATOR_MODE_NORMAL:
221 return sprintf(buf, "normal\n");
222 case REGULATOR_MODE_IDLE:
223 return sprintf(buf, "idle\n");
224 case REGULATOR_MODE_STANDBY:
225 return sprintf(buf, "standby\n");
226 default:
227 return sprintf(buf, "unknown\n");
228 }
229}
230
231static ssize_t set_mode(struct device *dev, struct device_attribute *attr,
232 const char *buf, size_t count)
233{
234 struct virtual_consumer_data *data = dev_get_drvdata(dev);
235 unsigned int mode;
236 int ret;
237
238 /*
239 * sysfs_streq() doesn't need the \n's, but we add them so the strings
240 * will be shared with show_mode(), above.
241 */
242 if (sysfs_streq(buf, "fast\n"))
243 mode = REGULATOR_MODE_FAST;
244 else if (sysfs_streq(buf, "normal\n"))
245 mode = REGULATOR_MODE_NORMAL;
246 else if (sysfs_streq(buf, "idle\n"))
247 mode = REGULATOR_MODE_IDLE;
248 else if (sysfs_streq(buf, "standby\n"))
249 mode = REGULATOR_MODE_STANDBY;
250 else {
251 dev_err(dev, "Configuring invalid mode\n");
252 return count;
253 }
254
255 mutex_lock(&data->lock);
256 ret = regulator_set_mode(data->regulator, mode);
257 if (ret == 0)
258 data->mode = mode;
259 else
260 dev_err(dev, "Failed to configure mode: %d\n", ret);
261 mutex_unlock(&data->lock);
262
263 return count;
264}
265
266static DEVICE_ATTR(min_microvolts, 0664, show_min_uV, set_min_uV);
267static DEVICE_ATTR(max_microvolts, 0664, show_max_uV, set_max_uV);
268static DEVICE_ATTR(min_microamps, 0664, show_min_uA, set_min_uA);
269static DEVICE_ATTR(max_microamps, 0664, show_max_uA, set_max_uA);
270static DEVICE_ATTR(mode, 0664, show_mode, set_mode);
271
272static struct attribute *regulator_virtual_attributes[] = {
273 &dev_attr_min_microvolts.attr,
274 &dev_attr_max_microvolts.attr,
275 &dev_attr_min_microamps.attr,
276 &dev_attr_max_microamps.attr,
277 &dev_attr_mode.attr,
278 NULL
279};
280
281static const struct attribute_group regulator_virtual_attr_group = {
282 .attrs = regulator_virtual_attributes,
283};
284
285#ifdef CONFIG_OF
286static const struct of_device_id regulator_virtual_consumer_of_match[] = {
287 { .compatible = "regulator-virtual-consumer" },
288 {},
289};
290MODULE_DEVICE_TABLE(of, regulator_virtual_consumer_of_match);
291#endif
292
293static int regulator_virtual_probe(struct platform_device *pdev)
294{
295 char *reg_id = dev_get_platdata(&pdev->dev);
296 struct virtual_consumer_data *drvdata;
297 static bool warned;
298 int ret;
299
300 if (!warned) {
301 warned = true;
302 pr_warn("**********************************************************\n");
303 pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
304 pr_warn("** **\n");
305 pr_warn("** regulator-virtual-consumer is only for testing and **\n");
306 pr_warn("** debugging. Do not use it in a production kernel. **\n");
307 pr_warn("** **\n");
308 pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
309 pr_warn("**********************************************************\n");
310 }
311
312 drvdata = devm_kzalloc(&pdev->dev, sizeof(struct virtual_consumer_data),
313 GFP_KERNEL);
314 if (drvdata == NULL)
315 return -ENOMEM;
316
317 /*
318 * This virtual consumer does not have any hardware-defined supply
319 * name, so just allow the regulator to be specified in a property
320 * named "default-supply" when we're being probed from devicetree.
321 */
322 if (!reg_id && pdev->dev.of_node)
323 reg_id = "default";
324
325 mutex_init(&drvdata->lock);
326
327 drvdata->regulator = devm_regulator_get(&pdev->dev, reg_id);
328 if (IS_ERR(drvdata->regulator))
329 return dev_err_probe(&pdev->dev, PTR_ERR(drvdata->regulator),
330 "Failed to obtain supply '%s'\n",
331 reg_id);
332
333 ret = sysfs_create_group(&pdev->dev.kobj,
334 ®ulator_virtual_attr_group);
335 if (ret != 0) {
336 dev_err(&pdev->dev,
337 "Failed to create attribute group: %d\n", ret);
338 return ret;
339 }
340
341 drvdata->mode = regulator_get_mode(drvdata->regulator);
342
343 platform_set_drvdata(pdev, drvdata);
344
345 return 0;
346}
347
348static int regulator_virtual_remove(struct platform_device *pdev)
349{
350 struct virtual_consumer_data *drvdata = platform_get_drvdata(pdev);
351
352 sysfs_remove_group(&pdev->dev.kobj, ®ulator_virtual_attr_group);
353
354 if (drvdata->enabled)
355 regulator_disable(drvdata->regulator);
356
357 return 0;
358}
359
360static struct platform_driver regulator_virtual_consumer_driver = {
361 .probe = regulator_virtual_probe,
362 .remove = regulator_virtual_remove,
363 .driver = {
364 .name = "reg-virt-consumer",
365 .of_match_table = of_match_ptr(regulator_virtual_consumer_of_match),
366 },
367};
368
369module_platform_driver(regulator_virtual_consumer_driver);
370
371MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
372MODULE_DESCRIPTION("Virtual regulator consumer");
373MODULE_LICENSE("GPL");
374MODULE_ALIAS("platform:reg-virt-consumer");