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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
c080909e MB |
2 | /* |
3 | * reg-virtual-consumer.c | |
4 | * | |
5 | * Copyright 2008 Wolfson Microelectronics PLC. | |
6 | * | |
7 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> | |
c080909e MB |
8 | */ |
9 | ||
10 | #include <linux/err.h> | |
11 | #include <linux/mutex.h> | |
12 | #include <linux/platform_device.h> | |
13 | #include <linux/regulator/consumer.h> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
65602c32 | 15 | #include <linux/module.h> |
80c05665 | 16 | #include <linux/of.h> |
c080909e MB |
17 | |
18 | struct virtual_consumer_data { | |
19 | struct mutex lock; | |
20 | struct regulator *regulator; | |
4cf95663 | 21 | bool enabled; |
c080909e MB |
22 | int min_uV; |
23 | int max_uV; | |
24 | int min_uA; | |
25 | int max_uA; | |
26 | unsigned int mode; | |
27 | }; | |
28 | ||
a07ac217 MB |
29 | static void update_voltage_constraints(struct device *dev, |
30 | struct virtual_consumer_data *data) | |
c080909e MB |
31 | { |
32 | int ret; | |
33 | ||
34 | if (data->min_uV && data->max_uV | |
35 | && data->min_uV <= data->max_uV) { | |
a5d2abce MB |
36 | dev_dbg(dev, "Requesting %d-%duV\n", |
37 | data->min_uV, data->max_uV); | |
c080909e | 38 | ret = regulator_set_voltage(data->regulator, |
a07ac217 | 39 | data->min_uV, data->max_uV); |
c080909e | 40 | if (ret != 0) { |
a07ac217 MB |
41 | dev_err(dev, |
42 | "regulator_set_voltage() failed: %d\n", ret); | |
c080909e MB |
43 | return; |
44 | } | |
45 | } | |
46 | ||
47 | if (data->min_uV && data->max_uV && !data->enabled) { | |
a5d2abce | 48 | dev_dbg(dev, "Enabling regulator\n"); |
c080909e MB |
49 | ret = regulator_enable(data->regulator); |
50 | if (ret == 0) | |
4cf95663 | 51 | data->enabled = true; |
c080909e | 52 | else |
a07ac217 | 53 | dev_err(dev, "regulator_enable() failed: %d\n", |
c080909e MB |
54 | ret); |
55 | } | |
56 | ||
57 | if (!(data->min_uV && data->max_uV) && data->enabled) { | |
a5d2abce | 58 | dev_dbg(dev, "Disabling regulator\n"); |
c080909e MB |
59 | ret = regulator_disable(data->regulator); |
60 | if (ret == 0) | |
4cf95663 | 61 | data->enabled = false; |
c080909e | 62 | else |
a07ac217 | 63 | dev_err(dev, "regulator_disable() failed: %d\n", |
c080909e MB |
64 | ret); |
65 | } | |
66 | } | |
67 | ||
a07ac217 MB |
68 | static void update_current_limit_constraints(struct device *dev, |
69 | struct virtual_consumer_data *data) | |
c080909e MB |
70 | { |
71 | int ret; | |
72 | ||
73 | if (data->max_uA | |
74 | && data->min_uA <= data->max_uA) { | |
a5d2abce MB |
75 | dev_dbg(dev, "Requesting %d-%duA\n", |
76 | data->min_uA, data->max_uA); | |
c080909e MB |
77 | ret = regulator_set_current_limit(data->regulator, |
78 | data->min_uA, data->max_uA); | |
79 | if (ret != 0) { | |
a07ac217 MB |
80 | dev_err(dev, |
81 | "regulator_set_current_limit() failed: %d\n", | |
82 | ret); | |
c080909e MB |
83 | return; |
84 | } | |
85 | } | |
86 | ||
87 | if (data->max_uA && !data->enabled) { | |
a5d2abce | 88 | dev_dbg(dev, "Enabling regulator\n"); |
c080909e MB |
89 | ret = regulator_enable(data->regulator); |
90 | if (ret == 0) | |
4cf95663 | 91 | data->enabled = true; |
c080909e | 92 | else |
a07ac217 | 93 | dev_err(dev, "regulator_enable() failed: %d\n", |
c080909e MB |
94 | ret); |
95 | } | |
96 | ||
97 | if (!(data->min_uA && data->max_uA) && data->enabled) { | |
a5d2abce | 98 | dev_dbg(dev, "Disabling regulator\n"); |
c080909e MB |
99 | ret = regulator_disable(data->regulator); |
100 | if (ret == 0) | |
4cf95663 | 101 | data->enabled = false; |
c080909e | 102 | else |
a07ac217 | 103 | dev_err(dev, "regulator_disable() failed: %d\n", |
c080909e MB |
104 | ret); |
105 | } | |
106 | } | |
107 | ||
108 | static 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 | ||
115 | static 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 | ||
85960e7b | 121 | if (kstrtol(buf, 10, &val) != 0) |
c080909e MB |
122 | return count; |
123 | ||
124 | mutex_lock(&data->lock); | |
125 | ||
126 | data->min_uV = val; | |
a07ac217 | 127 | update_voltage_constraints(dev, data); |
c080909e MB |
128 | |
129 | mutex_unlock(&data->lock); | |
130 | ||
131 | return count; | |
132 | } | |
133 | ||
134 | static 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 | ||
141 | static 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 | ||
85960e7b | 147 | if (kstrtol(buf, 10, &val) != 0) |
c080909e MB |
148 | return count; |
149 | ||
150 | mutex_lock(&data->lock); | |
151 | ||
152 | data->max_uV = val; | |
a07ac217 | 153 | update_voltage_constraints(dev, data); |
c080909e MB |
154 | |
155 | mutex_unlock(&data->lock); | |
156 | ||
157 | return count; | |
158 | } | |
159 | ||
160 | static 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 | ||
167 | static 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 | ||
85960e7b | 173 | if (kstrtol(buf, 10, &val) != 0) |
c080909e MB |
174 | return count; |
175 | ||
176 | mutex_lock(&data->lock); | |
177 | ||
178 | data->min_uA = val; | |
a07ac217 | 179 | update_current_limit_constraints(dev, data); |
c080909e MB |
180 | |
181 | mutex_unlock(&data->lock); | |
182 | ||
183 | return count; | |
184 | } | |
185 | ||
186 | static 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 | ||
193 | static 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 | ||
85960e7b | 199 | if (kstrtol(buf, 10, &val) != 0) |
c080909e MB |
200 | return count; |
201 | ||
202 | mutex_lock(&data->lock); | |
203 | ||
204 | data->max_uA = val; | |
a07ac217 | 205 | update_current_limit_constraints(dev, data); |
c080909e MB |
206 | |
207 | mutex_unlock(&data->lock); | |
208 | ||
209 | return count; | |
210 | } | |
211 | ||
212 | static 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 | ||
231 | static 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 | ||
9485397a AM |
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 | */ | |
aa61d558 | 242 | if (sysfs_streq(buf, "fast\n")) |
c080909e | 243 | mode = REGULATOR_MODE_FAST; |
aa61d558 | 244 | else if (sysfs_streq(buf, "normal\n")) |
c080909e | 245 | mode = REGULATOR_MODE_NORMAL; |
aa61d558 | 246 | else if (sysfs_streq(buf, "idle\n")) |
c080909e | 247 | mode = REGULATOR_MODE_IDLE; |
aa61d558 | 248 | else if (sysfs_streq(buf, "standby\n")) |
c080909e MB |
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 | ||
71e06af2 RR |
266 | static DEVICE_ATTR(min_microvolts, 0664, show_min_uV, set_min_uV); |
267 | static DEVICE_ATTR(max_microvolts, 0664, show_max_uV, set_max_uV); | |
268 | static DEVICE_ATTR(min_microamps, 0664, show_min_uA, set_min_uA); | |
269 | static DEVICE_ATTR(max_microamps, 0664, show_max_uA, set_max_uA); | |
270 | static DEVICE_ATTR(mode, 0664, show_mode, set_mode); | |
c080909e | 271 | |
4cf95663 DT |
272 | static 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 | |
c080909e MB |
279 | }; |
280 | ||
4cf95663 DT |
281 | static const struct attribute_group regulator_virtual_attr_group = { |
282 | .attrs = regulator_virtual_attributes, | |
283 | }; | |
284 | ||
80c05665 VW |
285 | #ifdef CONFIG_OF |
286 | static const struct of_device_id regulator_virtual_consumer_of_match[] = { | |
287 | { .compatible = "regulator-virtual-consumer" }, | |
288 | {}, | |
289 | }; | |
290 | MODULE_DEVICE_TABLE(of, regulator_virtual_consumer_of_match); | |
291 | #endif | |
292 | ||
a5023574 | 293 | static int regulator_virtual_probe(struct platform_device *pdev) |
c080909e | 294 | { |
dff91d0b | 295 | char *reg_id = dev_get_platdata(&pdev->dev); |
c080909e | 296 | struct virtual_consumer_data *drvdata; |
d2fb5487 | 297 | static bool warned; |
4cf95663 | 298 | int ret; |
c080909e | 299 | |
d2fb5487 VW |
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 | ||
a81edbde AL |
312 | drvdata = devm_kzalloc(&pdev->dev, sizeof(struct virtual_consumer_data), |
313 | GFP_KERNEL); | |
4cf95663 | 314 | if (drvdata == NULL) |
72b86876 | 315 | return -ENOMEM; |
c080909e | 316 | |
80c05665 VW |
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 | ||
c080909e MB |
325 | mutex_init(&drvdata->lock); |
326 | ||
a81edbde | 327 | drvdata->regulator = devm_regulator_get(&pdev->dev, reg_id); |
75c3543e VW |
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); | |
c080909e | 332 | |
4cf95663 DT |
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); | |
a81edbde | 338 | return ret; |
c080909e MB |
339 | } |
340 | ||
341 | drvdata->mode = regulator_get_mode(drvdata->regulator); | |
342 | ||
343 | platform_set_drvdata(pdev, drvdata); | |
344 | ||
345 | return 0; | |
c080909e MB |
346 | } |
347 | ||
8dc995f5 | 348 | static int regulator_virtual_remove(struct platform_device *pdev) |
c080909e MB |
349 | { |
350 | struct virtual_consumer_data *drvdata = platform_get_drvdata(pdev); | |
c080909e | 351 | |
4cf95663 DT |
352 | sysfs_remove_group(&pdev->dev.kobj, ®ulator_virtual_attr_group); |
353 | ||
c080909e MB |
354 | if (drvdata->enabled) |
355 | regulator_disable(drvdata->regulator); | |
c080909e MB |
356 | |
357 | return 0; | |
358 | } | |
359 | ||
360 | static struct platform_driver regulator_virtual_consumer_driver = { | |
4cf95663 | 361 | .probe = regulator_virtual_probe, |
5eb9f2b9 | 362 | .remove = regulator_virtual_remove, |
c080909e MB |
363 | .driver = { |
364 | .name = "reg-virt-consumer", | |
259b93b2 | 365 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
80c05665 | 366 | .of_match_table = of_match_ptr(regulator_virtual_consumer_of_match), |
c080909e MB |
367 | }, |
368 | }; | |
369 | ||
005d610f | 370 | module_platform_driver(regulator_virtual_consumer_driver); |
c080909e MB |
371 | |
372 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
373 | MODULE_DESCRIPTION("Virtual regulator consumer"); | |
374 | MODULE_LICENSE("GPL"); | |
38c53c89 | 375 | MODULE_ALIAS("platform:reg-virt-consumer"); |