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f6cc69f1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
75d2364e SP |
2 | /* |
3 | * Power capping class | |
4 | * Copyright (c) 2013, Intel Corporation. | |
75d2364e SP |
5 | */ |
6 | ||
7 | #include <linux/module.h> | |
8 | #include <linux/device.h> | |
9 | #include <linux/err.h> | |
10 | #include <linux/slab.h> | |
11 | #include <linux/powercap.h> | |
12 | ||
13 | #define to_powercap_zone(n) container_of(n, struct powercap_zone, dev) | |
14 | #define to_powercap_control_type(n) \ | |
15 | container_of(n, struct powercap_control_type, dev) | |
16 | ||
17 | /* Power zone show function */ | |
18 | #define define_power_zone_show(_attr) \ | |
19 | static ssize_t _attr##_show(struct device *dev, \ | |
20 | struct device_attribute *dev_attr,\ | |
21 | char *buf) \ | |
22 | { \ | |
23 | u64 value; \ | |
24 | ssize_t len = -EINVAL; \ | |
25 | struct powercap_zone *power_zone = to_powercap_zone(dev); \ | |
26 | \ | |
27 | if (power_zone->ops->get_##_attr) { \ | |
28 | if (!power_zone->ops->get_##_attr(power_zone, &value)) \ | |
29 | len = sprintf(buf, "%lld\n", value); \ | |
30 | } \ | |
31 | \ | |
32 | return len; \ | |
33 | } | |
34 | ||
35 | /* The only meaningful input is 0 (reset), others are silently ignored */ | |
36 | #define define_power_zone_store(_attr) \ | |
37 | static ssize_t _attr##_store(struct device *dev,\ | |
38 | struct device_attribute *dev_attr, \ | |
39 | const char *buf, size_t count) \ | |
40 | { \ | |
41 | int err; \ | |
42 | struct powercap_zone *power_zone = to_powercap_zone(dev); \ | |
43 | u64 value; \ | |
44 | \ | |
45 | err = kstrtoull(buf, 10, &value); \ | |
46 | if (err) \ | |
47 | return -EINVAL; \ | |
48 | if (value) \ | |
49 | return count; \ | |
50 | if (power_zone->ops->reset_##_attr) { \ | |
51 | if (!power_zone->ops->reset_##_attr(power_zone)) \ | |
52 | return count; \ | |
53 | } \ | |
54 | \ | |
55 | return -EINVAL; \ | |
56 | } | |
57 | ||
58 | /* Power zone constraint show function */ | |
59 | #define define_power_zone_constraint_show(_attr) \ | |
60 | static ssize_t show_constraint_##_attr(struct device *dev, \ | |
61 | struct device_attribute *dev_attr,\ | |
62 | char *buf) \ | |
63 | { \ | |
64 | u64 value; \ | |
65 | ssize_t len = -ENODATA; \ | |
66 | struct powercap_zone *power_zone = to_powercap_zone(dev); \ | |
67 | int id; \ | |
68 | struct powercap_zone_constraint *pconst;\ | |
69 | \ | |
70 | if (!sscanf(dev_attr->attr.name, "constraint_%d_", &id)) \ | |
71 | return -EINVAL; \ | |
72 | if (id >= power_zone->const_id_cnt) \ | |
73 | return -EINVAL; \ | |
74 | pconst = &power_zone->constraints[id]; \ | |
75 | if (pconst && pconst->ops && pconst->ops->get_##_attr) { \ | |
76 | if (!pconst->ops->get_##_attr(power_zone, id, &value)) \ | |
77 | len = sprintf(buf, "%lld\n", value); \ | |
78 | } \ | |
79 | \ | |
80 | return len; \ | |
81 | } | |
82 | ||
83 | /* Power zone constraint store function */ | |
84 | #define define_power_zone_constraint_store(_attr) \ | |
85 | static ssize_t store_constraint_##_attr(struct device *dev,\ | |
86 | struct device_attribute *dev_attr, \ | |
87 | const char *buf, size_t count) \ | |
88 | { \ | |
89 | int err; \ | |
90 | u64 value; \ | |
91 | struct powercap_zone *power_zone = to_powercap_zone(dev); \ | |
92 | int id; \ | |
93 | struct powercap_zone_constraint *pconst;\ | |
94 | \ | |
95 | if (!sscanf(dev_attr->attr.name, "constraint_%d_", &id)) \ | |
96 | return -EINVAL; \ | |
97 | if (id >= power_zone->const_id_cnt) \ | |
98 | return -EINVAL; \ | |
99 | pconst = &power_zone->constraints[id]; \ | |
100 | err = kstrtoull(buf, 10, &value); \ | |
101 | if (err) \ | |
102 | return -EINVAL; \ | |
103 | if (pconst && pconst->ops && pconst->ops->set_##_attr) { \ | |
104 | if (!pconst->ops->set_##_attr(power_zone, id, value)) \ | |
105 | return count; \ | |
106 | } \ | |
107 | \ | |
108 | return -ENODATA; \ | |
109 | } | |
110 | ||
111 | /* Power zone information callbacks */ | |
112 | define_power_zone_show(power_uw); | |
113 | define_power_zone_show(max_power_range_uw); | |
114 | define_power_zone_show(energy_uj); | |
115 | define_power_zone_store(energy_uj); | |
116 | define_power_zone_show(max_energy_range_uj); | |
117 | ||
118 | /* Power zone attributes */ | |
119 | static DEVICE_ATTR_RO(max_power_range_uw); | |
120 | static DEVICE_ATTR_RO(power_uw); | |
121 | static DEVICE_ATTR_RO(max_energy_range_uj); | |
122 | static DEVICE_ATTR_RW(energy_uj); | |
123 | ||
124 | /* Power zone constraint attributes callbacks */ | |
125 | define_power_zone_constraint_show(power_limit_uw); | |
126 | define_power_zone_constraint_store(power_limit_uw); | |
127 | define_power_zone_constraint_show(time_window_us); | |
128 | define_power_zone_constraint_store(time_window_us); | |
129 | define_power_zone_constraint_show(max_power_uw); | |
130 | define_power_zone_constraint_show(min_power_uw); | |
131 | define_power_zone_constraint_show(max_time_window_us); | |
132 | define_power_zone_constraint_show(min_time_window_us); | |
133 | ||
134 | /* For one time seeding of constraint device attributes */ | |
135 | struct powercap_constraint_attr { | |
136 | struct device_attribute power_limit_attr; | |
137 | struct device_attribute time_window_attr; | |
138 | struct device_attribute max_power_attr; | |
139 | struct device_attribute min_power_attr; | |
140 | struct device_attribute max_time_window_attr; | |
141 | struct device_attribute min_time_window_attr; | |
142 | struct device_attribute name_attr; | |
143 | }; | |
144 | ||
145 | static struct powercap_constraint_attr | |
146 | constraint_attrs[MAX_CONSTRAINTS_PER_ZONE]; | |
147 | ||
148 | /* A list of powercap control_types */ | |
149 | static LIST_HEAD(powercap_cntrl_list); | |
150 | /* Mutex to protect list of powercap control_types */ | |
151 | static DEFINE_MUTEX(powercap_cntrl_list_lock); | |
152 | ||
153 | #define POWERCAP_CONSTRAINT_NAME_LEN 30 /* Some limit to avoid overflow */ | |
154 | static ssize_t show_constraint_name(struct device *dev, | |
155 | struct device_attribute *dev_attr, | |
156 | char *buf) | |
157 | { | |
158 | const char *name; | |
159 | struct powercap_zone *power_zone = to_powercap_zone(dev); | |
160 | int id; | |
161 | ssize_t len = -ENODATA; | |
162 | struct powercap_zone_constraint *pconst; | |
163 | ||
164 | if (!sscanf(dev_attr->attr.name, "constraint_%d_", &id)) | |
165 | return -EINVAL; | |
166 | if (id >= power_zone->const_id_cnt) | |
167 | return -EINVAL; | |
168 | pconst = &power_zone->constraints[id]; | |
169 | ||
170 | if (pconst && pconst->ops && pconst->ops->get_name) { | |
171 | name = pconst->ops->get_name(power_zone, id); | |
172 | if (name) { | |
b4ba76fb LL |
173 | sprintf(buf, "%.*s\n", POWERCAP_CONSTRAINT_NAME_LEN - 1, |
174 | name); | |
75d2364e SP |
175 | len = strlen(buf); |
176 | } | |
177 | } | |
178 | ||
179 | return len; | |
180 | } | |
181 | ||
182 | static int create_constraint_attribute(int id, const char *name, | |
183 | int mode, | |
184 | struct device_attribute *dev_attr, | |
185 | ssize_t (*show)(struct device *, | |
186 | struct device_attribute *, char *), | |
187 | ssize_t (*store)(struct device *, | |
188 | struct device_attribute *, | |
189 | const char *, size_t) | |
190 | ) | |
191 | { | |
192 | ||
193 | dev_attr->attr.name = kasprintf(GFP_KERNEL, "constraint_%d_%s", | |
194 | id, name); | |
195 | if (!dev_attr->attr.name) | |
196 | return -ENOMEM; | |
197 | dev_attr->attr.mode = mode; | |
198 | dev_attr->show = show; | |
199 | dev_attr->store = store; | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
204 | static void free_constraint_attributes(void) | |
205 | { | |
206 | int i; | |
207 | ||
208 | for (i = 0; i < MAX_CONSTRAINTS_PER_ZONE; ++i) { | |
209 | kfree(constraint_attrs[i].power_limit_attr.attr.name); | |
210 | kfree(constraint_attrs[i].time_window_attr.attr.name); | |
211 | kfree(constraint_attrs[i].name_attr.attr.name); | |
212 | kfree(constraint_attrs[i].max_power_attr.attr.name); | |
213 | kfree(constraint_attrs[i].min_power_attr.attr.name); | |
214 | kfree(constraint_attrs[i].max_time_window_attr.attr.name); | |
215 | kfree(constraint_attrs[i].min_time_window_attr.attr.name); | |
216 | } | |
217 | } | |
218 | ||
219 | static int seed_constraint_attributes(void) | |
220 | { | |
221 | int i; | |
222 | int ret; | |
223 | ||
224 | for (i = 0; i < MAX_CONSTRAINTS_PER_ZONE; ++i) { | |
225 | ret = create_constraint_attribute(i, "power_limit_uw", | |
226 | S_IWUSR | S_IRUGO, | |
227 | &constraint_attrs[i].power_limit_attr, | |
228 | show_constraint_power_limit_uw, | |
229 | store_constraint_power_limit_uw); | |
230 | if (ret) | |
231 | goto err_alloc; | |
232 | ret = create_constraint_attribute(i, "time_window_us", | |
233 | S_IWUSR | S_IRUGO, | |
234 | &constraint_attrs[i].time_window_attr, | |
235 | show_constraint_time_window_us, | |
236 | store_constraint_time_window_us); | |
237 | if (ret) | |
238 | goto err_alloc; | |
239 | ret = create_constraint_attribute(i, "name", S_IRUGO, | |
240 | &constraint_attrs[i].name_attr, | |
241 | show_constraint_name, | |
242 | NULL); | |
243 | if (ret) | |
244 | goto err_alloc; | |
245 | ret = create_constraint_attribute(i, "max_power_uw", S_IRUGO, | |
246 | &constraint_attrs[i].max_power_attr, | |
247 | show_constraint_max_power_uw, | |
248 | NULL); | |
249 | if (ret) | |
250 | goto err_alloc; | |
251 | ret = create_constraint_attribute(i, "min_power_uw", S_IRUGO, | |
252 | &constraint_attrs[i].min_power_attr, | |
253 | show_constraint_min_power_uw, | |
254 | NULL); | |
255 | if (ret) | |
256 | goto err_alloc; | |
257 | ret = create_constraint_attribute(i, "max_time_window_us", | |
258 | S_IRUGO, | |
259 | &constraint_attrs[i].max_time_window_attr, | |
260 | show_constraint_max_time_window_us, | |
261 | NULL); | |
262 | if (ret) | |
263 | goto err_alloc; | |
264 | ret = create_constraint_attribute(i, "min_time_window_us", | |
265 | S_IRUGO, | |
266 | &constraint_attrs[i].min_time_window_attr, | |
267 | show_constraint_min_time_window_us, | |
268 | NULL); | |
269 | if (ret) | |
270 | goto err_alloc; | |
271 | ||
272 | } | |
273 | ||
274 | return 0; | |
275 | ||
276 | err_alloc: | |
277 | free_constraint_attributes(); | |
278 | ||
279 | return ret; | |
280 | } | |
281 | ||
282 | static int create_constraints(struct powercap_zone *power_zone, | |
600c395b JL |
283 | int nr_constraints, |
284 | const struct powercap_zone_constraint_ops *const_ops) | |
75d2364e SP |
285 | { |
286 | int i; | |
287 | int ret = 0; | |
288 | int count; | |
289 | struct powercap_zone_constraint *pconst; | |
290 | ||
291 | if (!power_zone || !const_ops || !const_ops->get_power_limit_uw || | |
292 | !const_ops->set_power_limit_uw || | |
293 | !const_ops->get_time_window_us || | |
294 | !const_ops->set_time_window_us) | |
295 | return -EINVAL; | |
296 | ||
297 | count = power_zone->zone_attr_count; | |
298 | for (i = 0; i < nr_constraints; ++i) { | |
299 | pconst = &power_zone->constraints[i]; | |
300 | pconst->ops = const_ops; | |
301 | pconst->id = power_zone->const_id_cnt; | |
302 | power_zone->const_id_cnt++; | |
303 | power_zone->zone_dev_attrs[count++] = | |
304 | &constraint_attrs[i].power_limit_attr.attr; | |
305 | power_zone->zone_dev_attrs[count++] = | |
306 | &constraint_attrs[i].time_window_attr.attr; | |
307 | if (pconst->ops->get_name) | |
308 | power_zone->zone_dev_attrs[count++] = | |
309 | &constraint_attrs[i].name_attr.attr; | |
310 | if (pconst->ops->get_max_power_uw) | |
311 | power_zone->zone_dev_attrs[count++] = | |
312 | &constraint_attrs[i].max_power_attr.attr; | |
313 | if (pconst->ops->get_min_power_uw) | |
314 | power_zone->zone_dev_attrs[count++] = | |
315 | &constraint_attrs[i].min_power_attr.attr; | |
316 | if (pconst->ops->get_max_time_window_us) | |
317 | power_zone->zone_dev_attrs[count++] = | |
318 | &constraint_attrs[i].max_time_window_attr.attr; | |
319 | if (pconst->ops->get_min_time_window_us) | |
320 | power_zone->zone_dev_attrs[count++] = | |
321 | &constraint_attrs[i].min_time_window_attr.attr; | |
322 | } | |
323 | power_zone->zone_attr_count = count; | |
324 | ||
325 | return ret; | |
326 | } | |
327 | ||
328 | static bool control_type_valid(void *control_type) | |
329 | { | |
330 | struct powercap_control_type *pos = NULL; | |
331 | bool found = false; | |
332 | ||
333 | mutex_lock(&powercap_cntrl_list_lock); | |
334 | ||
335 | list_for_each_entry(pos, &powercap_cntrl_list, node) { | |
336 | if (pos == control_type) { | |
337 | found = true; | |
338 | break; | |
339 | } | |
340 | } | |
341 | mutex_unlock(&powercap_cntrl_list_lock); | |
342 | ||
343 | return found; | |
344 | } | |
345 | ||
346 | static ssize_t name_show(struct device *dev, | |
347 | struct device_attribute *attr, | |
348 | char *buf) | |
349 | { | |
350 | struct powercap_zone *power_zone = to_powercap_zone(dev); | |
351 | ||
352 | return sprintf(buf, "%s\n", power_zone->name); | |
353 | } | |
354 | ||
355 | static DEVICE_ATTR_RO(name); | |
356 | ||
357 | /* Create zone and attributes in sysfs */ | |
358 | static void create_power_zone_common_attributes( | |
359 | struct powercap_zone *power_zone) | |
360 | { | |
361 | int count = 0; | |
362 | ||
363 | power_zone->zone_dev_attrs[count++] = &dev_attr_name.attr; | |
364 | if (power_zone->ops->get_max_energy_range_uj) | |
365 | power_zone->zone_dev_attrs[count++] = | |
366 | &dev_attr_max_energy_range_uj.attr; | |
95677a9a SP |
367 | if (power_zone->ops->get_energy_uj) { |
368 | if (power_zone->ops->reset_energy_uj) | |
949dd010 | 369 | dev_attr_energy_uj.attr.mode = S_IWUSR | S_IRUSR; |
95677a9a | 370 | else |
949dd010 | 371 | dev_attr_energy_uj.attr.mode = S_IRUSR; |
75d2364e SP |
372 | power_zone->zone_dev_attrs[count++] = |
373 | &dev_attr_energy_uj.attr; | |
95677a9a | 374 | } |
75d2364e SP |
375 | if (power_zone->ops->get_power_uw) |
376 | power_zone->zone_dev_attrs[count++] = | |
377 | &dev_attr_power_uw.attr; | |
378 | if (power_zone->ops->get_max_power_range_uw) | |
379 | power_zone->zone_dev_attrs[count++] = | |
380 | &dev_attr_max_power_range_uw.attr; | |
381 | power_zone->zone_dev_attrs[count] = NULL; | |
382 | power_zone->zone_attr_count = count; | |
383 | } | |
384 | ||
385 | static void powercap_release(struct device *dev) | |
386 | { | |
387 | bool allocated; | |
388 | ||
389 | if (dev->parent) { | |
390 | struct powercap_zone *power_zone = to_powercap_zone(dev); | |
391 | ||
392 | /* Store flag as the release() may free memory */ | |
393 | allocated = power_zone->allocated; | |
394 | /* Remove id from parent idr struct */ | |
395 | idr_remove(power_zone->parent_idr, power_zone->id); | |
396 | /* Destroy idrs allocated for this zone */ | |
397 | idr_destroy(&power_zone->idr); | |
398 | kfree(power_zone->name); | |
399 | kfree(power_zone->zone_dev_attrs); | |
400 | kfree(power_zone->constraints); | |
401 | if (power_zone->ops->release) | |
402 | power_zone->ops->release(power_zone); | |
403 | if (allocated) | |
404 | kfree(power_zone); | |
405 | } else { | |
406 | struct powercap_control_type *control_type = | |
407 | to_powercap_control_type(dev); | |
408 | ||
409 | /* Store flag as the release() may free memory */ | |
410 | allocated = control_type->allocated; | |
411 | idr_destroy(&control_type->idr); | |
412 | mutex_destroy(&control_type->lock); | |
413 | if (control_type->ops && control_type->ops->release) | |
414 | control_type->ops->release(control_type); | |
415 | if (allocated) | |
416 | kfree(control_type); | |
417 | } | |
418 | } | |
419 | ||
420 | static ssize_t enabled_show(struct device *dev, | |
421 | struct device_attribute *attr, | |
422 | char *buf) | |
423 | { | |
424 | bool mode = true; | |
425 | ||
426 | /* Default is enabled */ | |
427 | if (dev->parent) { | |
428 | struct powercap_zone *power_zone = to_powercap_zone(dev); | |
429 | if (power_zone->ops->get_enable) | |
430 | if (power_zone->ops->get_enable(power_zone, &mode)) | |
431 | mode = false; | |
432 | } else { | |
433 | struct powercap_control_type *control_type = | |
434 | to_powercap_control_type(dev); | |
435 | if (control_type->ops && control_type->ops->get_enable) | |
436 | if (control_type->ops->get_enable(control_type, &mode)) | |
437 | mode = false; | |
438 | } | |
439 | ||
440 | return sprintf(buf, "%d\n", mode); | |
441 | } | |
442 | ||
443 | static ssize_t enabled_store(struct device *dev, | |
444 | struct device_attribute *attr, | |
445 | const char *buf, size_t len) | |
446 | { | |
447 | bool mode; | |
448 | ||
449 | if (strtobool(buf, &mode)) | |
450 | return -EINVAL; | |
451 | if (dev->parent) { | |
452 | struct powercap_zone *power_zone = to_powercap_zone(dev); | |
453 | if (power_zone->ops->set_enable) | |
454 | if (!power_zone->ops->set_enable(power_zone, mode)) | |
455 | return len; | |
456 | } else { | |
457 | struct powercap_control_type *control_type = | |
458 | to_powercap_control_type(dev); | |
459 | if (control_type->ops && control_type->ops->set_enable) | |
460 | if (!control_type->ops->set_enable(control_type, mode)) | |
461 | return len; | |
462 | } | |
463 | ||
464 | return -ENOSYS; | |
465 | } | |
466 | ||
9e3410b7 TR |
467 | static DEVICE_ATTR_RW(enabled); |
468 | ||
469 | static struct attribute *powercap_attrs[] = { | |
470 | &dev_attr_enabled.attr, | |
471 | NULL, | |
75d2364e | 472 | }; |
9e3410b7 | 473 | ATTRIBUTE_GROUPS(powercap); |
75d2364e SP |
474 | |
475 | static struct class powercap_class = { | |
476 | .name = "powercap", | |
477 | .dev_release = powercap_release, | |
9e3410b7 | 478 | .dev_groups = powercap_groups, |
75d2364e SP |
479 | }; |
480 | ||
481 | struct powercap_zone *powercap_register_zone( | |
600c395b JL |
482 | struct powercap_zone *power_zone, |
483 | struct powercap_control_type *control_type, | |
484 | const char *name, | |
485 | struct powercap_zone *parent, | |
486 | const struct powercap_zone_ops *ops, | |
487 | int nr_constraints, | |
488 | const struct powercap_zone_constraint_ops *const_ops) | |
75d2364e SP |
489 | { |
490 | int result; | |
491 | int nr_attrs; | |
492 | ||
493 | if (!name || !control_type || !ops || | |
494 | nr_constraints > MAX_CONSTRAINTS_PER_ZONE || | |
495 | (!ops->get_energy_uj && !ops->get_power_uw) || | |
496 | !control_type_valid(control_type)) | |
497 | return ERR_PTR(-EINVAL); | |
498 | ||
499 | if (power_zone) { | |
500 | if (!ops->release) | |
501 | return ERR_PTR(-EINVAL); | |
502 | memset(power_zone, 0, sizeof(*power_zone)); | |
503 | } else { | |
504 | power_zone = kzalloc(sizeof(*power_zone), GFP_KERNEL); | |
505 | if (!power_zone) | |
506 | return ERR_PTR(-ENOMEM); | |
507 | power_zone->allocated = true; | |
508 | } | |
509 | power_zone->ops = ops; | |
510 | power_zone->control_type_inst = control_type; | |
511 | if (!parent) { | |
512 | power_zone->dev.parent = &control_type->dev; | |
513 | power_zone->parent_idr = &control_type->idr; | |
514 | } else { | |
515 | power_zone->dev.parent = &parent->dev; | |
516 | power_zone->parent_idr = &parent->idr; | |
517 | } | |
518 | power_zone->dev.class = &powercap_class; | |
519 | ||
520 | mutex_lock(&control_type->lock); | |
521 | /* Using idr to get the unique id */ | |
522 | result = idr_alloc(power_zone->parent_idr, NULL, 0, 0, GFP_KERNEL); | |
523 | if (result < 0) | |
524 | goto err_idr_alloc; | |
525 | ||
526 | power_zone->id = result; | |
527 | idr_init(&power_zone->idr); | |
216c4e9d | 528 | result = -ENOMEM; |
75d2364e SP |
529 | power_zone->name = kstrdup(name, GFP_KERNEL); |
530 | if (!power_zone->name) | |
531 | goto err_name_alloc; | |
532 | dev_set_name(&power_zone->dev, "%s:%x", | |
533 | dev_name(power_zone->dev.parent), | |
534 | power_zone->id); | |
6396bb22 KC |
535 | power_zone->constraints = kcalloc(nr_constraints, |
536 | sizeof(*power_zone->constraints), | |
537 | GFP_KERNEL); | |
75d2364e SP |
538 | if (!power_zone->constraints) |
539 | goto err_const_alloc; | |
540 | ||
541 | nr_attrs = nr_constraints * POWERCAP_CONSTRAINTS_ATTRS + | |
542 | POWERCAP_ZONE_MAX_ATTRS + 1; | |
6396bb22 KC |
543 | power_zone->zone_dev_attrs = kcalloc(nr_attrs, sizeof(void *), |
544 | GFP_KERNEL); | |
75d2364e SP |
545 | if (!power_zone->zone_dev_attrs) |
546 | goto err_attr_alloc; | |
547 | create_power_zone_common_attributes(power_zone); | |
548 | result = create_constraints(power_zone, nr_constraints, const_ops); | |
549 | if (result) | |
550 | goto err_dev_ret; | |
551 | ||
552 | power_zone->zone_dev_attrs[power_zone->zone_attr_count] = NULL; | |
553 | power_zone->dev_zone_attr_group.attrs = power_zone->zone_dev_attrs; | |
554 | power_zone->dev_attr_groups[0] = &power_zone->dev_zone_attr_group; | |
555 | power_zone->dev_attr_groups[1] = NULL; | |
556 | power_zone->dev.groups = power_zone->dev_attr_groups; | |
557 | result = device_register(&power_zone->dev); | |
558 | if (result) | |
559 | goto err_dev_ret; | |
560 | ||
561 | control_type->nr_zones++; | |
562 | mutex_unlock(&control_type->lock); | |
563 | ||
564 | return power_zone; | |
565 | ||
566 | err_dev_ret: | |
567 | kfree(power_zone->zone_dev_attrs); | |
568 | err_attr_alloc: | |
569 | kfree(power_zone->constraints); | |
570 | err_const_alloc: | |
571 | kfree(power_zone->name); | |
572 | err_name_alloc: | |
573 | idr_remove(power_zone->parent_idr, power_zone->id); | |
574 | err_idr_alloc: | |
575 | if (power_zone->allocated) | |
576 | kfree(power_zone); | |
577 | mutex_unlock(&control_type->lock); | |
578 | ||
579 | return ERR_PTR(result); | |
580 | } | |
581 | EXPORT_SYMBOL_GPL(powercap_register_zone); | |
582 | ||
583 | int powercap_unregister_zone(struct powercap_control_type *control_type, | |
584 | struct powercap_zone *power_zone) | |
585 | { | |
586 | if (!power_zone || !control_type) | |
587 | return -EINVAL; | |
588 | ||
589 | mutex_lock(&control_type->lock); | |
590 | control_type->nr_zones--; | |
591 | mutex_unlock(&control_type->lock); | |
592 | ||
593 | device_unregister(&power_zone->dev); | |
594 | ||
595 | return 0; | |
596 | } | |
597 | EXPORT_SYMBOL_GPL(powercap_unregister_zone); | |
598 | ||
599 | struct powercap_control_type *powercap_register_control_type( | |
600 | struct powercap_control_type *control_type, | |
601 | const char *name, | |
602 | const struct powercap_control_type_ops *ops) | |
603 | { | |
604 | int result; | |
605 | ||
606 | if (!name) | |
607 | return ERR_PTR(-EINVAL); | |
608 | if (control_type) { | |
609 | if (!ops || !ops->release) | |
610 | return ERR_PTR(-EINVAL); | |
611 | memset(control_type, 0, sizeof(*control_type)); | |
612 | } else { | |
613 | control_type = kzalloc(sizeof(*control_type), GFP_KERNEL); | |
614 | if (!control_type) | |
615 | return ERR_PTR(-ENOMEM); | |
616 | control_type->allocated = true; | |
617 | } | |
618 | mutex_init(&control_type->lock); | |
619 | control_type->ops = ops; | |
620 | INIT_LIST_HEAD(&control_type->node); | |
621 | control_type->dev.class = &powercap_class; | |
08ff4cbe | 622 | dev_set_name(&control_type->dev, "%s", name); |
75d2364e SP |
623 | result = device_register(&control_type->dev); |
624 | if (result) { | |
625 | if (control_type->allocated) | |
626 | kfree(control_type); | |
627 | return ERR_PTR(result); | |
628 | } | |
629 | idr_init(&control_type->idr); | |
630 | ||
631 | mutex_lock(&powercap_cntrl_list_lock); | |
632 | list_add_tail(&control_type->node, &powercap_cntrl_list); | |
633 | mutex_unlock(&powercap_cntrl_list_lock); | |
634 | ||
635 | return control_type; | |
636 | } | |
637 | EXPORT_SYMBOL_GPL(powercap_register_control_type); | |
638 | ||
639 | int powercap_unregister_control_type(struct powercap_control_type *control_type) | |
640 | { | |
641 | struct powercap_control_type *pos = NULL; | |
642 | ||
643 | if (control_type->nr_zones) { | |
644 | dev_err(&control_type->dev, "Zones of this type still not freed\n"); | |
645 | return -EINVAL; | |
646 | } | |
647 | mutex_lock(&powercap_cntrl_list_lock); | |
648 | list_for_each_entry(pos, &powercap_cntrl_list, node) { | |
649 | if (pos == control_type) { | |
650 | list_del(&control_type->node); | |
651 | mutex_unlock(&powercap_cntrl_list_lock); | |
652 | device_unregister(&control_type->dev); | |
653 | return 0; | |
654 | } | |
655 | } | |
656 | mutex_unlock(&powercap_cntrl_list_lock); | |
657 | ||
658 | return -ENODEV; | |
659 | } | |
660 | EXPORT_SYMBOL_GPL(powercap_unregister_control_type); | |
661 | ||
662 | static int __init powercap_init(void) | |
663 | { | |
7f634489 | 664 | int result; |
75d2364e SP |
665 | |
666 | result = seed_constraint_attributes(); | |
667 | if (result) | |
668 | return result; | |
669 | ||
7f634489 | 670 | return class_register(&powercap_class); |
75d2364e SP |
671 | } |
672 | ||
f76cb066 | 673 | fs_initcall(powercap_init); |
75d2364e SP |
674 | |
675 | MODULE_DESCRIPTION("PowerCap sysfs Driver"); | |
676 | MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); | |
677 | MODULE_LICENSE("GPL v2"); |