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c080909e MB |
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> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
65602c32 | 19 | #include <linux/module.h> |
c080909e MB |
20 | |
21 | struct virtual_consumer_data { | |
22 | struct mutex lock; | |
23 | struct regulator *regulator; | |
4cf95663 | 24 | bool enabled; |
c080909e MB |
25 | int min_uV; |
26 | int max_uV; | |
27 | int min_uA; | |
28 | int max_uA; | |
29 | unsigned int mode; | |
30 | }; | |
31 | ||
a07ac217 MB |
32 | static void update_voltage_constraints(struct device *dev, |
33 | struct virtual_consumer_data *data) | |
c080909e MB |
34 | { |
35 | int ret; | |
36 | ||
37 | if (data->min_uV && data->max_uV | |
38 | && data->min_uV <= data->max_uV) { | |
a5d2abce MB |
39 | dev_dbg(dev, "Requesting %d-%duV\n", |
40 | data->min_uV, data->max_uV); | |
c080909e | 41 | ret = regulator_set_voltage(data->regulator, |
a07ac217 | 42 | data->min_uV, data->max_uV); |
c080909e | 43 | if (ret != 0) { |
a07ac217 MB |
44 | dev_err(dev, |
45 | "regulator_set_voltage() failed: %d\n", ret); | |
c080909e MB |
46 | return; |
47 | } | |
48 | } | |
49 | ||
50 | if (data->min_uV && data->max_uV && !data->enabled) { | |
a5d2abce | 51 | dev_dbg(dev, "Enabling regulator\n"); |
c080909e MB |
52 | ret = regulator_enable(data->regulator); |
53 | if (ret == 0) | |
4cf95663 | 54 | data->enabled = true; |
c080909e | 55 | else |
a07ac217 | 56 | dev_err(dev, "regulator_enable() failed: %d\n", |
c080909e MB |
57 | ret); |
58 | } | |
59 | ||
60 | if (!(data->min_uV && data->max_uV) && data->enabled) { | |
a5d2abce | 61 | dev_dbg(dev, "Disabling regulator\n"); |
c080909e MB |
62 | ret = regulator_disable(data->regulator); |
63 | if (ret == 0) | |
4cf95663 | 64 | data->enabled = false; |
c080909e | 65 | else |
a07ac217 | 66 | dev_err(dev, "regulator_disable() failed: %d\n", |
c080909e MB |
67 | ret); |
68 | } | |
69 | } | |
70 | ||
a07ac217 MB |
71 | static void update_current_limit_constraints(struct device *dev, |
72 | struct virtual_consumer_data *data) | |
c080909e MB |
73 | { |
74 | int ret; | |
75 | ||
76 | if (data->max_uA | |
77 | && data->min_uA <= data->max_uA) { | |
a5d2abce MB |
78 | dev_dbg(dev, "Requesting %d-%duA\n", |
79 | data->min_uA, data->max_uA); | |
c080909e MB |
80 | ret = regulator_set_current_limit(data->regulator, |
81 | data->min_uA, data->max_uA); | |
82 | if (ret != 0) { | |
a07ac217 MB |
83 | dev_err(dev, |
84 | "regulator_set_current_limit() failed: %d\n", | |
85 | ret); | |
c080909e MB |
86 | return; |
87 | } | |
88 | } | |
89 | ||
90 | if (data->max_uA && !data->enabled) { | |
a5d2abce | 91 | dev_dbg(dev, "Enabling regulator\n"); |
c080909e MB |
92 | ret = regulator_enable(data->regulator); |
93 | if (ret == 0) | |
4cf95663 | 94 | data->enabled = true; |
c080909e | 95 | else |
a07ac217 | 96 | dev_err(dev, "regulator_enable() failed: %d\n", |
c080909e MB |
97 | ret); |
98 | } | |
99 | ||
100 | if (!(data->min_uA && data->max_uA) && data->enabled) { | |
a5d2abce | 101 | dev_dbg(dev, "Disabling regulator\n"); |
c080909e MB |
102 | ret = regulator_disable(data->regulator); |
103 | if (ret == 0) | |
4cf95663 | 104 | data->enabled = false; |
c080909e | 105 | else |
a07ac217 | 106 | dev_err(dev, "regulator_disable() failed: %d\n", |
c080909e MB |
107 | ret); |
108 | } | |
109 | } | |
110 | ||
111 | static ssize_t show_min_uV(struct device *dev, | |
112 | struct device_attribute *attr, char *buf) | |
113 | { | |
114 | struct virtual_consumer_data *data = dev_get_drvdata(dev); | |
115 | return sprintf(buf, "%d\n", data->min_uV); | |
116 | } | |
117 | ||
118 | static ssize_t set_min_uV(struct device *dev, struct device_attribute *attr, | |
119 | const char *buf, size_t count) | |
120 | { | |
121 | struct virtual_consumer_data *data = dev_get_drvdata(dev); | |
122 | long val; | |
123 | ||
85960e7b | 124 | if (kstrtol(buf, 10, &val) != 0) |
c080909e MB |
125 | return count; |
126 | ||
127 | mutex_lock(&data->lock); | |
128 | ||
129 | data->min_uV = val; | |
a07ac217 | 130 | update_voltage_constraints(dev, data); |
c080909e MB |
131 | |
132 | mutex_unlock(&data->lock); | |
133 | ||
134 | return count; | |
135 | } | |
136 | ||
137 | static ssize_t show_max_uV(struct device *dev, | |
138 | struct device_attribute *attr, char *buf) | |
139 | { | |
140 | struct virtual_consumer_data *data = dev_get_drvdata(dev); | |
141 | return sprintf(buf, "%d\n", data->max_uV); | |
142 | } | |
143 | ||
144 | static ssize_t set_max_uV(struct device *dev, struct device_attribute *attr, | |
145 | const char *buf, size_t count) | |
146 | { | |
147 | struct virtual_consumer_data *data = dev_get_drvdata(dev); | |
148 | long val; | |
149 | ||
85960e7b | 150 | if (kstrtol(buf, 10, &val) != 0) |
c080909e MB |
151 | return count; |
152 | ||
153 | mutex_lock(&data->lock); | |
154 | ||
155 | data->max_uV = val; | |
a07ac217 | 156 | update_voltage_constraints(dev, data); |
c080909e MB |
157 | |
158 | mutex_unlock(&data->lock); | |
159 | ||
160 | return count; | |
161 | } | |
162 | ||
163 | static ssize_t show_min_uA(struct device *dev, | |
164 | struct device_attribute *attr, char *buf) | |
165 | { | |
166 | struct virtual_consumer_data *data = dev_get_drvdata(dev); | |
167 | return sprintf(buf, "%d\n", data->min_uA); | |
168 | } | |
169 | ||
170 | static ssize_t set_min_uA(struct device *dev, struct device_attribute *attr, | |
171 | const char *buf, size_t count) | |
172 | { | |
173 | struct virtual_consumer_data *data = dev_get_drvdata(dev); | |
174 | long val; | |
175 | ||
85960e7b | 176 | if (kstrtol(buf, 10, &val) != 0) |
c080909e MB |
177 | return count; |
178 | ||
179 | mutex_lock(&data->lock); | |
180 | ||
181 | data->min_uA = val; | |
a07ac217 | 182 | update_current_limit_constraints(dev, data); |
c080909e MB |
183 | |
184 | mutex_unlock(&data->lock); | |
185 | ||
186 | return count; | |
187 | } | |
188 | ||
189 | static ssize_t show_max_uA(struct device *dev, | |
190 | struct device_attribute *attr, char *buf) | |
191 | { | |
192 | struct virtual_consumer_data *data = dev_get_drvdata(dev); | |
193 | return sprintf(buf, "%d\n", data->max_uA); | |
194 | } | |
195 | ||
196 | static ssize_t set_max_uA(struct device *dev, struct device_attribute *attr, | |
197 | const char *buf, size_t count) | |
198 | { | |
199 | struct virtual_consumer_data *data = dev_get_drvdata(dev); | |
200 | long val; | |
201 | ||
85960e7b | 202 | if (kstrtol(buf, 10, &val) != 0) |
c080909e MB |
203 | return count; |
204 | ||
205 | mutex_lock(&data->lock); | |
206 | ||
207 | data->max_uA = val; | |
a07ac217 | 208 | update_current_limit_constraints(dev, data); |
c080909e MB |
209 | |
210 | mutex_unlock(&data->lock); | |
211 | ||
212 | return count; | |
213 | } | |
214 | ||
215 | static ssize_t show_mode(struct device *dev, | |
216 | struct device_attribute *attr, char *buf) | |
217 | { | |
218 | struct virtual_consumer_data *data = dev_get_drvdata(dev); | |
219 | ||
220 | switch (data->mode) { | |
221 | case REGULATOR_MODE_FAST: | |
222 | return sprintf(buf, "fast\n"); | |
223 | case REGULATOR_MODE_NORMAL: | |
224 | return sprintf(buf, "normal\n"); | |
225 | case REGULATOR_MODE_IDLE: | |
226 | return sprintf(buf, "idle\n"); | |
227 | case REGULATOR_MODE_STANDBY: | |
228 | return sprintf(buf, "standby\n"); | |
229 | default: | |
230 | return sprintf(buf, "unknown\n"); | |
231 | } | |
232 | } | |
233 | ||
234 | static ssize_t set_mode(struct device *dev, struct device_attribute *attr, | |
235 | const char *buf, size_t count) | |
236 | { | |
237 | struct virtual_consumer_data *data = dev_get_drvdata(dev); | |
238 | unsigned int mode; | |
239 | int ret; | |
240 | ||
9485397a AM |
241 | /* |
242 | * sysfs_streq() doesn't need the \n's, but we add them so the strings | |
243 | * will be shared with show_mode(), above. | |
244 | */ | |
aa61d558 | 245 | if (sysfs_streq(buf, "fast\n")) |
c080909e | 246 | mode = REGULATOR_MODE_FAST; |
aa61d558 | 247 | else if (sysfs_streq(buf, "normal\n")) |
c080909e | 248 | mode = REGULATOR_MODE_NORMAL; |
aa61d558 | 249 | else if (sysfs_streq(buf, "idle\n")) |
c080909e | 250 | mode = REGULATOR_MODE_IDLE; |
aa61d558 | 251 | else if (sysfs_streq(buf, "standby\n")) |
c080909e MB |
252 | mode = REGULATOR_MODE_STANDBY; |
253 | else { | |
254 | dev_err(dev, "Configuring invalid mode\n"); | |
255 | return count; | |
256 | } | |
257 | ||
258 | mutex_lock(&data->lock); | |
259 | ret = regulator_set_mode(data->regulator, mode); | |
260 | if (ret == 0) | |
261 | data->mode = mode; | |
262 | else | |
263 | dev_err(dev, "Failed to configure mode: %d\n", ret); | |
264 | mutex_unlock(&data->lock); | |
265 | ||
266 | return count; | |
267 | } | |
268 | ||
71e06af2 RR |
269 | static DEVICE_ATTR(min_microvolts, 0664, show_min_uV, set_min_uV); |
270 | static DEVICE_ATTR(max_microvolts, 0664, show_max_uV, set_max_uV); | |
271 | static DEVICE_ATTR(min_microamps, 0664, show_min_uA, set_min_uA); | |
272 | static DEVICE_ATTR(max_microamps, 0664, show_max_uA, set_max_uA); | |
273 | static DEVICE_ATTR(mode, 0664, show_mode, set_mode); | |
c080909e | 274 | |
4cf95663 DT |
275 | static struct attribute *regulator_virtual_attributes[] = { |
276 | &dev_attr_min_microvolts.attr, | |
277 | &dev_attr_max_microvolts.attr, | |
278 | &dev_attr_min_microamps.attr, | |
279 | &dev_attr_max_microamps.attr, | |
280 | &dev_attr_mode.attr, | |
281 | NULL | |
c080909e MB |
282 | }; |
283 | ||
4cf95663 DT |
284 | static const struct attribute_group regulator_virtual_attr_group = { |
285 | .attrs = regulator_virtual_attributes, | |
286 | }; | |
287 | ||
a5023574 | 288 | static int regulator_virtual_probe(struct platform_device *pdev) |
c080909e | 289 | { |
dff91d0b | 290 | char *reg_id = dev_get_platdata(&pdev->dev); |
c080909e | 291 | struct virtual_consumer_data *drvdata; |
4cf95663 | 292 | int ret; |
c080909e | 293 | |
a81edbde AL |
294 | drvdata = devm_kzalloc(&pdev->dev, sizeof(struct virtual_consumer_data), |
295 | GFP_KERNEL); | |
4cf95663 | 296 | if (drvdata == NULL) |
72b86876 | 297 | return -ENOMEM; |
c080909e MB |
298 | |
299 | mutex_init(&drvdata->lock); | |
300 | ||
a81edbde | 301 | drvdata->regulator = devm_regulator_get(&pdev->dev, reg_id); |
c080909e MB |
302 | if (IS_ERR(drvdata->regulator)) { |
303 | ret = PTR_ERR(drvdata->regulator); | |
d61c3d56 MB |
304 | dev_err(&pdev->dev, "Failed to obtain supply '%s': %d\n", |
305 | reg_id, ret); | |
a81edbde | 306 | return ret; |
c080909e MB |
307 | } |
308 | ||
4cf95663 DT |
309 | ret = sysfs_create_group(&pdev->dev.kobj, |
310 | ®ulator_virtual_attr_group); | |
311 | if (ret != 0) { | |
312 | dev_err(&pdev->dev, | |
313 | "Failed to create attribute group: %d\n", ret); | |
a81edbde | 314 | return ret; |
c080909e MB |
315 | } |
316 | ||
317 | drvdata->mode = regulator_get_mode(drvdata->regulator); | |
318 | ||
319 | platform_set_drvdata(pdev, drvdata); | |
320 | ||
321 | return 0; | |
c080909e MB |
322 | } |
323 | ||
8dc995f5 | 324 | static int regulator_virtual_remove(struct platform_device *pdev) |
c080909e MB |
325 | { |
326 | struct virtual_consumer_data *drvdata = platform_get_drvdata(pdev); | |
c080909e | 327 | |
4cf95663 DT |
328 | sysfs_remove_group(&pdev->dev.kobj, ®ulator_virtual_attr_group); |
329 | ||
c080909e MB |
330 | if (drvdata->enabled) |
331 | regulator_disable(drvdata->regulator); | |
c080909e MB |
332 | |
333 | return 0; | |
334 | } | |
335 | ||
336 | static struct platform_driver regulator_virtual_consumer_driver = { | |
4cf95663 | 337 | .probe = regulator_virtual_probe, |
5eb9f2b9 | 338 | .remove = regulator_virtual_remove, |
c080909e MB |
339 | .driver = { |
340 | .name = "reg-virt-consumer", | |
341 | }, | |
342 | }; | |
343 | ||
005d610f | 344 | module_platform_driver(regulator_virtual_consumer_driver); |
c080909e MB |
345 | |
346 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
347 | MODULE_DESCRIPTION("Virtual regulator consumer"); | |
348 | MODULE_LICENSE("GPL"); | |
38c53c89 | 349 | MODULE_ALIAS("platform:reg-virt-consumer"); |