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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> | |
18 | ||
19 | struct virtual_consumer_data { | |
20 | struct mutex lock; | |
21 | struct regulator *regulator; | |
22 | int enabled; | |
23 | int min_uV; | |
24 | int max_uV; | |
25 | int min_uA; | |
26 | int max_uA; | |
27 | unsigned int mode; | |
28 | }; | |
29 | ||
a07ac217 MB |
30 | static void update_voltage_constraints(struct device *dev, |
31 | struct virtual_consumer_data *data) | |
c080909e MB |
32 | { |
33 | int ret; | |
34 | ||
35 | if (data->min_uV && data->max_uV | |
36 | && data->min_uV <= data->max_uV) { | |
a5d2abce MB |
37 | dev_dbg(dev, "Requesting %d-%duV\n", |
38 | data->min_uV, data->max_uV); | |
c080909e | 39 | ret = regulator_set_voltage(data->regulator, |
a07ac217 | 40 | data->min_uV, data->max_uV); |
c080909e | 41 | if (ret != 0) { |
a07ac217 MB |
42 | dev_err(dev, |
43 | "regulator_set_voltage() failed: %d\n", ret); | |
c080909e MB |
44 | return; |
45 | } | |
46 | } | |
47 | ||
48 | if (data->min_uV && data->max_uV && !data->enabled) { | |
a5d2abce | 49 | dev_dbg(dev, "Enabling regulator\n"); |
c080909e MB |
50 | ret = regulator_enable(data->regulator); |
51 | if (ret == 0) | |
52 | data->enabled = 1; | |
53 | else | |
a07ac217 | 54 | dev_err(dev, "regulator_enable() failed: %d\n", |
c080909e MB |
55 | ret); |
56 | } | |
57 | ||
58 | if (!(data->min_uV && data->max_uV) && data->enabled) { | |
a5d2abce | 59 | dev_dbg(dev, "Disabling regulator\n"); |
c080909e MB |
60 | ret = regulator_disable(data->regulator); |
61 | if (ret == 0) | |
62 | data->enabled = 0; | |
63 | else | |
a07ac217 | 64 | dev_err(dev, "regulator_disable() failed: %d\n", |
c080909e MB |
65 | ret); |
66 | } | |
67 | } | |
68 | ||
a07ac217 MB |
69 | static void update_current_limit_constraints(struct device *dev, |
70 | struct virtual_consumer_data *data) | |
c080909e MB |
71 | { |
72 | int ret; | |
73 | ||
74 | if (data->max_uA | |
75 | && data->min_uA <= data->max_uA) { | |
a5d2abce MB |
76 | dev_dbg(dev, "Requesting %d-%duA\n", |
77 | data->min_uA, data->max_uA); | |
c080909e MB |
78 | ret = regulator_set_current_limit(data->regulator, |
79 | data->min_uA, data->max_uA); | |
80 | if (ret != 0) { | |
a07ac217 MB |
81 | dev_err(dev, |
82 | "regulator_set_current_limit() failed: %d\n", | |
83 | ret); | |
c080909e MB |
84 | return; |
85 | } | |
86 | } | |
87 | ||
88 | if (data->max_uA && !data->enabled) { | |
a5d2abce | 89 | dev_dbg(dev, "Enabling regulator\n"); |
c080909e MB |
90 | ret = regulator_enable(data->regulator); |
91 | if (ret == 0) | |
92 | data->enabled = 1; | |
93 | else | |
a07ac217 | 94 | dev_err(dev, "regulator_enable() failed: %d\n", |
c080909e MB |
95 | ret); |
96 | } | |
97 | ||
98 | if (!(data->min_uA && data->max_uA) && data->enabled) { | |
a5d2abce | 99 | dev_dbg(dev, "Disabling regulator\n"); |
c080909e MB |
100 | ret = regulator_disable(data->regulator); |
101 | if (ret == 0) | |
102 | data->enabled = 0; | |
103 | else | |
a07ac217 | 104 | dev_err(dev, "regulator_disable() failed: %d\n", |
c080909e MB |
105 | ret); |
106 | } | |
107 | } | |
108 | ||
109 | static ssize_t show_min_uV(struct device *dev, | |
110 | struct device_attribute *attr, char *buf) | |
111 | { | |
112 | struct virtual_consumer_data *data = dev_get_drvdata(dev); | |
113 | return sprintf(buf, "%d\n", data->min_uV); | |
114 | } | |
115 | ||
116 | static ssize_t set_min_uV(struct device *dev, struct device_attribute *attr, | |
117 | const char *buf, size_t count) | |
118 | { | |
119 | struct virtual_consumer_data *data = dev_get_drvdata(dev); | |
120 | long val; | |
121 | ||
122 | if (strict_strtol(buf, 10, &val) != 0) | |
123 | return count; | |
124 | ||
125 | mutex_lock(&data->lock); | |
126 | ||
127 | data->min_uV = val; | |
a07ac217 | 128 | update_voltage_constraints(dev, data); |
c080909e MB |
129 | |
130 | mutex_unlock(&data->lock); | |
131 | ||
132 | return count; | |
133 | } | |
134 | ||
135 | static ssize_t show_max_uV(struct device *dev, | |
136 | struct device_attribute *attr, char *buf) | |
137 | { | |
138 | struct virtual_consumer_data *data = dev_get_drvdata(dev); | |
139 | return sprintf(buf, "%d\n", data->max_uV); | |
140 | } | |
141 | ||
142 | static ssize_t set_max_uV(struct device *dev, struct device_attribute *attr, | |
143 | const char *buf, size_t count) | |
144 | { | |
145 | struct virtual_consumer_data *data = dev_get_drvdata(dev); | |
146 | long val; | |
147 | ||
148 | if (strict_strtol(buf, 10, &val) != 0) | |
149 | return count; | |
150 | ||
151 | mutex_lock(&data->lock); | |
152 | ||
153 | data->max_uV = val; | |
a07ac217 | 154 | update_voltage_constraints(dev, data); |
c080909e MB |
155 | |
156 | mutex_unlock(&data->lock); | |
157 | ||
158 | return count; | |
159 | } | |
160 | ||
161 | static ssize_t show_min_uA(struct device *dev, | |
162 | struct device_attribute *attr, char *buf) | |
163 | { | |
164 | struct virtual_consumer_data *data = dev_get_drvdata(dev); | |
165 | return sprintf(buf, "%d\n", data->min_uA); | |
166 | } | |
167 | ||
168 | static ssize_t set_min_uA(struct device *dev, struct device_attribute *attr, | |
169 | const char *buf, size_t count) | |
170 | { | |
171 | struct virtual_consumer_data *data = dev_get_drvdata(dev); | |
172 | long val; | |
173 | ||
174 | if (strict_strtol(buf, 10, &val) != 0) | |
175 | return count; | |
176 | ||
177 | mutex_lock(&data->lock); | |
178 | ||
179 | data->min_uA = val; | |
a07ac217 | 180 | update_current_limit_constraints(dev, data); |
c080909e MB |
181 | |
182 | mutex_unlock(&data->lock); | |
183 | ||
184 | return count; | |
185 | } | |
186 | ||
187 | static ssize_t show_max_uA(struct device *dev, | |
188 | struct device_attribute *attr, char *buf) | |
189 | { | |
190 | struct virtual_consumer_data *data = dev_get_drvdata(dev); | |
191 | return sprintf(buf, "%d\n", data->max_uA); | |
192 | } | |
193 | ||
194 | static ssize_t set_max_uA(struct device *dev, struct device_attribute *attr, | |
195 | const char *buf, size_t count) | |
196 | { | |
197 | struct virtual_consumer_data *data = dev_get_drvdata(dev); | |
198 | long val; | |
199 | ||
200 | if (strict_strtol(buf, 10, &val) != 0) | |
201 | return count; | |
202 | ||
203 | mutex_lock(&data->lock); | |
204 | ||
205 | data->max_uA = val; | |
a07ac217 | 206 | update_current_limit_constraints(dev, data); |
c080909e MB |
207 | |
208 | mutex_unlock(&data->lock); | |
209 | ||
210 | return count; | |
211 | } | |
212 | ||
213 | static ssize_t show_mode(struct device *dev, | |
214 | struct device_attribute *attr, char *buf) | |
215 | { | |
216 | struct virtual_consumer_data *data = dev_get_drvdata(dev); | |
217 | ||
218 | switch (data->mode) { | |
219 | case REGULATOR_MODE_FAST: | |
220 | return sprintf(buf, "fast\n"); | |
221 | case REGULATOR_MODE_NORMAL: | |
222 | return sprintf(buf, "normal\n"); | |
223 | case REGULATOR_MODE_IDLE: | |
224 | return sprintf(buf, "idle\n"); | |
225 | case REGULATOR_MODE_STANDBY: | |
226 | return sprintf(buf, "standby\n"); | |
227 | default: | |
228 | return sprintf(buf, "unknown\n"); | |
229 | } | |
230 | } | |
231 | ||
232 | static ssize_t set_mode(struct device *dev, struct device_attribute *attr, | |
233 | const char *buf, size_t count) | |
234 | { | |
235 | struct virtual_consumer_data *data = dev_get_drvdata(dev); | |
236 | unsigned int mode; | |
237 | int ret; | |
238 | ||
9485397a AM |
239 | /* |
240 | * sysfs_streq() doesn't need the \n's, but we add them so the strings | |
241 | * will be shared with show_mode(), above. | |
242 | */ | |
aa61d558 | 243 | if (sysfs_streq(buf, "fast\n")) |
c080909e | 244 | mode = REGULATOR_MODE_FAST; |
aa61d558 | 245 | else if (sysfs_streq(buf, "normal\n")) |
c080909e | 246 | mode = REGULATOR_MODE_NORMAL; |
aa61d558 | 247 | else if (sysfs_streq(buf, "idle\n")) |
c080909e | 248 | mode = REGULATOR_MODE_IDLE; |
aa61d558 | 249 | else if (sysfs_streq(buf, "standby\n")) |
c080909e MB |
250 | mode = REGULATOR_MODE_STANDBY; |
251 | else { | |
252 | dev_err(dev, "Configuring invalid mode\n"); | |
253 | return count; | |
254 | } | |
255 | ||
256 | mutex_lock(&data->lock); | |
257 | ret = regulator_set_mode(data->regulator, mode); | |
258 | if (ret == 0) | |
259 | data->mode = mode; | |
260 | else | |
261 | dev_err(dev, "Failed to configure mode: %d\n", ret); | |
262 | mutex_unlock(&data->lock); | |
263 | ||
264 | return count; | |
265 | } | |
266 | ||
267 | static DEVICE_ATTR(min_microvolts, 0666, show_min_uV, set_min_uV); | |
268 | static DEVICE_ATTR(max_microvolts, 0666, show_max_uV, set_max_uV); | |
269 | static DEVICE_ATTR(min_microamps, 0666, show_min_uA, set_min_uA); | |
270 | static DEVICE_ATTR(max_microamps, 0666, show_max_uA, set_max_uA); | |
271 | static DEVICE_ATTR(mode, 0666, show_mode, set_mode); | |
272 | ||
fefdae42 | 273 | static struct device_attribute *attributes[] = { |
c080909e MB |
274 | &dev_attr_min_microvolts, |
275 | &dev_attr_max_microvolts, | |
276 | &dev_attr_min_microamps, | |
277 | &dev_attr_max_microamps, | |
278 | &dev_attr_mode, | |
279 | }; | |
280 | ||
281 | static int regulator_virtual_consumer_probe(struct platform_device *pdev) | |
282 | { | |
283 | char *reg_id = pdev->dev.platform_data; | |
284 | struct virtual_consumer_data *drvdata; | |
285 | int ret, i; | |
286 | ||
287 | drvdata = kzalloc(sizeof(struct virtual_consumer_data), GFP_KERNEL); | |
288 | if (drvdata == NULL) { | |
72b86876 | 289 | return -ENOMEM; |
c080909e MB |
290 | } |
291 | ||
292 | mutex_init(&drvdata->lock); | |
293 | ||
294 | drvdata->regulator = regulator_get(&pdev->dev, reg_id); | |
295 | if (IS_ERR(drvdata->regulator)) { | |
296 | ret = PTR_ERR(drvdata->regulator); | |
d61c3d56 MB |
297 | dev_err(&pdev->dev, "Failed to obtain supply '%s': %d\n", |
298 | reg_id, ret); | |
c080909e MB |
299 | goto err; |
300 | } | |
301 | ||
302 | for (i = 0; i < ARRAY_SIZE(attributes); i++) { | |
303 | ret = device_create_file(&pdev->dev, attributes[i]); | |
72b86876 MB |
304 | if (ret != 0) { |
305 | dev_err(&pdev->dev, "Failed to create attr %d: %d\n", | |
306 | i, ret); | |
307 | goto err_regulator; | |
308 | } | |
c080909e MB |
309 | } |
310 | ||
311 | drvdata->mode = regulator_get_mode(drvdata->regulator); | |
312 | ||
313 | platform_set_drvdata(pdev, drvdata); | |
314 | ||
315 | return 0; | |
316 | ||
72b86876 MB |
317 | err_regulator: |
318 | regulator_put(drvdata->regulator); | |
c080909e MB |
319 | err: |
320 | for (i = 0; i < ARRAY_SIZE(attributes); i++) | |
321 | device_remove_file(&pdev->dev, attributes[i]); | |
322 | kfree(drvdata); | |
323 | return ret; | |
324 | } | |
325 | ||
326 | static int regulator_virtual_consumer_remove(struct platform_device *pdev) | |
327 | { | |
328 | struct virtual_consumer_data *drvdata = platform_get_drvdata(pdev); | |
329 | int i; | |
330 | ||
331 | for (i = 0; i < ARRAY_SIZE(attributes); i++) | |
332 | device_remove_file(&pdev->dev, attributes[i]); | |
333 | if (drvdata->enabled) | |
334 | regulator_disable(drvdata->regulator); | |
335 | regulator_put(drvdata->regulator); | |
336 | ||
337 | kfree(drvdata); | |
338 | ||
339 | return 0; | |
340 | } | |
341 | ||
342 | static struct platform_driver regulator_virtual_consumer_driver = { | |
343 | .probe = regulator_virtual_consumer_probe, | |
344 | .remove = regulator_virtual_consumer_remove, | |
345 | .driver = { | |
346 | .name = "reg-virt-consumer", | |
347 | }, | |
348 | }; | |
349 | ||
350 | ||
351 | static int __init regulator_virtual_consumer_init(void) | |
352 | { | |
353 | return platform_driver_register(®ulator_virtual_consumer_driver); | |
354 | } | |
355 | module_init(regulator_virtual_consumer_init); | |
356 | ||
357 | static void __exit regulator_virtual_consumer_exit(void) | |
358 | { | |
359 | platform_driver_unregister(®ulator_virtual_consumer_driver); | |
360 | } | |
361 | module_exit(regulator_virtual_consumer_exit); | |
362 | ||
363 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
364 | MODULE_DESCRIPTION("Virtual regulator consumer"); | |
365 | MODULE_LICENSE("GPL"); | |
38c53c89 | 366 | MODULE_ALIAS("platform:reg-virt-consumer"); |