Commit | Line | Data |
---|---|---|
75d2364e SP |
1 | /* |
2 | * Power capping class | |
3 | * Copyright (c) 2013, Intel Corporation. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc. | |
16 | * | |
17 | */ | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/device.h> | |
21 | #include <linux/err.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/powercap.h> | |
24 | ||
25 | #define to_powercap_zone(n) container_of(n, struct powercap_zone, dev) | |
26 | #define to_powercap_control_type(n) \ | |
27 | container_of(n, struct powercap_control_type, dev) | |
28 | ||
29 | /* Power zone show function */ | |
30 | #define define_power_zone_show(_attr) \ | |
31 | static ssize_t _attr##_show(struct device *dev, \ | |
32 | struct device_attribute *dev_attr,\ | |
33 | char *buf) \ | |
34 | { \ | |
35 | u64 value; \ | |
36 | ssize_t len = -EINVAL; \ | |
37 | struct powercap_zone *power_zone = to_powercap_zone(dev); \ | |
38 | \ | |
39 | if (power_zone->ops->get_##_attr) { \ | |
40 | if (!power_zone->ops->get_##_attr(power_zone, &value)) \ | |
41 | len = sprintf(buf, "%lld\n", value); \ | |
42 | } \ | |
43 | \ | |
44 | return len; \ | |
45 | } | |
46 | ||
47 | /* The only meaningful input is 0 (reset), others are silently ignored */ | |
48 | #define define_power_zone_store(_attr) \ | |
49 | static ssize_t _attr##_store(struct device *dev,\ | |
50 | struct device_attribute *dev_attr, \ | |
51 | const char *buf, size_t count) \ | |
52 | { \ | |
53 | int err; \ | |
54 | struct powercap_zone *power_zone = to_powercap_zone(dev); \ | |
55 | u64 value; \ | |
56 | \ | |
57 | err = kstrtoull(buf, 10, &value); \ | |
58 | if (err) \ | |
59 | return -EINVAL; \ | |
60 | if (value) \ | |
61 | return count; \ | |
62 | if (power_zone->ops->reset_##_attr) { \ | |
63 | if (!power_zone->ops->reset_##_attr(power_zone)) \ | |
64 | return count; \ | |
65 | } \ | |
66 | \ | |
67 | return -EINVAL; \ | |
68 | } | |
69 | ||
70 | /* Power zone constraint show function */ | |
71 | #define define_power_zone_constraint_show(_attr) \ | |
72 | static ssize_t show_constraint_##_attr(struct device *dev, \ | |
73 | struct device_attribute *dev_attr,\ | |
74 | char *buf) \ | |
75 | { \ | |
76 | u64 value; \ | |
77 | ssize_t len = -ENODATA; \ | |
78 | struct powercap_zone *power_zone = to_powercap_zone(dev); \ | |
79 | int id; \ | |
80 | struct powercap_zone_constraint *pconst;\ | |
81 | \ | |
82 | if (!sscanf(dev_attr->attr.name, "constraint_%d_", &id)) \ | |
83 | return -EINVAL; \ | |
84 | if (id >= power_zone->const_id_cnt) \ | |
85 | return -EINVAL; \ | |
86 | pconst = &power_zone->constraints[id]; \ | |
87 | if (pconst && pconst->ops && pconst->ops->get_##_attr) { \ | |
88 | if (!pconst->ops->get_##_attr(power_zone, id, &value)) \ | |
89 | len = sprintf(buf, "%lld\n", value); \ | |
90 | } \ | |
91 | \ | |
92 | return len; \ | |
93 | } | |
94 | ||
95 | /* Power zone constraint store function */ | |
96 | #define define_power_zone_constraint_store(_attr) \ | |
97 | static ssize_t store_constraint_##_attr(struct device *dev,\ | |
98 | struct device_attribute *dev_attr, \ | |
99 | const char *buf, size_t count) \ | |
100 | { \ | |
101 | int err; \ | |
102 | u64 value; \ | |
103 | struct powercap_zone *power_zone = to_powercap_zone(dev); \ | |
104 | int id; \ | |
105 | struct powercap_zone_constraint *pconst;\ | |
106 | \ | |
107 | if (!sscanf(dev_attr->attr.name, "constraint_%d_", &id)) \ | |
108 | return -EINVAL; \ | |
109 | if (id >= power_zone->const_id_cnt) \ | |
110 | return -EINVAL; \ | |
111 | pconst = &power_zone->constraints[id]; \ | |
112 | err = kstrtoull(buf, 10, &value); \ | |
113 | if (err) \ | |
114 | return -EINVAL; \ | |
115 | if (pconst && pconst->ops && pconst->ops->set_##_attr) { \ | |
116 | if (!pconst->ops->set_##_attr(power_zone, id, value)) \ | |
117 | return count; \ | |
118 | } \ | |
119 | \ | |
120 | return -ENODATA; \ | |
121 | } | |
122 | ||
123 | /* Power zone information callbacks */ | |
124 | define_power_zone_show(power_uw); | |
125 | define_power_zone_show(max_power_range_uw); | |
126 | define_power_zone_show(energy_uj); | |
127 | define_power_zone_store(energy_uj); | |
128 | define_power_zone_show(max_energy_range_uj); | |
129 | ||
130 | /* Power zone attributes */ | |
131 | static DEVICE_ATTR_RO(max_power_range_uw); | |
132 | static DEVICE_ATTR_RO(power_uw); | |
133 | static DEVICE_ATTR_RO(max_energy_range_uj); | |
134 | static DEVICE_ATTR_RW(energy_uj); | |
135 | ||
136 | /* Power zone constraint attributes callbacks */ | |
137 | define_power_zone_constraint_show(power_limit_uw); | |
138 | define_power_zone_constraint_store(power_limit_uw); | |
139 | define_power_zone_constraint_show(time_window_us); | |
140 | define_power_zone_constraint_store(time_window_us); | |
141 | define_power_zone_constraint_show(max_power_uw); | |
142 | define_power_zone_constraint_show(min_power_uw); | |
143 | define_power_zone_constraint_show(max_time_window_us); | |
144 | define_power_zone_constraint_show(min_time_window_us); | |
145 | ||
146 | /* For one time seeding of constraint device attributes */ | |
147 | struct powercap_constraint_attr { | |
148 | struct device_attribute power_limit_attr; | |
149 | struct device_attribute time_window_attr; | |
150 | struct device_attribute max_power_attr; | |
151 | struct device_attribute min_power_attr; | |
152 | struct device_attribute max_time_window_attr; | |
153 | struct device_attribute min_time_window_attr; | |
154 | struct device_attribute name_attr; | |
155 | }; | |
156 | ||
157 | static struct powercap_constraint_attr | |
158 | constraint_attrs[MAX_CONSTRAINTS_PER_ZONE]; | |
159 | ||
160 | /* A list of powercap control_types */ | |
161 | static LIST_HEAD(powercap_cntrl_list); | |
162 | /* Mutex to protect list of powercap control_types */ | |
163 | static DEFINE_MUTEX(powercap_cntrl_list_lock); | |
164 | ||
165 | #define POWERCAP_CONSTRAINT_NAME_LEN 30 /* Some limit to avoid overflow */ | |
166 | static ssize_t show_constraint_name(struct device *dev, | |
167 | struct device_attribute *dev_attr, | |
168 | char *buf) | |
169 | { | |
170 | const char *name; | |
171 | struct powercap_zone *power_zone = to_powercap_zone(dev); | |
172 | int id; | |
173 | ssize_t len = -ENODATA; | |
174 | struct powercap_zone_constraint *pconst; | |
175 | ||
176 | if (!sscanf(dev_attr->attr.name, "constraint_%d_", &id)) | |
177 | return -EINVAL; | |
178 | if (id >= power_zone->const_id_cnt) | |
179 | return -EINVAL; | |
180 | pconst = &power_zone->constraints[id]; | |
181 | ||
182 | if (pconst && pconst->ops && pconst->ops->get_name) { | |
183 | name = pconst->ops->get_name(power_zone, id); | |
184 | if (name) { | |
185 | snprintf(buf, POWERCAP_CONSTRAINT_NAME_LEN, | |
186 | "%s\n", name); | |
187 | buf[POWERCAP_CONSTRAINT_NAME_LEN] = '\0'; | |
188 | len = strlen(buf); | |
189 | } | |
190 | } | |
191 | ||
192 | return len; | |
193 | } | |
194 | ||
195 | static int create_constraint_attribute(int id, const char *name, | |
196 | int mode, | |
197 | struct device_attribute *dev_attr, | |
198 | ssize_t (*show)(struct device *, | |
199 | struct device_attribute *, char *), | |
200 | ssize_t (*store)(struct device *, | |
201 | struct device_attribute *, | |
202 | const char *, size_t) | |
203 | ) | |
204 | { | |
205 | ||
206 | dev_attr->attr.name = kasprintf(GFP_KERNEL, "constraint_%d_%s", | |
207 | id, name); | |
208 | if (!dev_attr->attr.name) | |
209 | return -ENOMEM; | |
210 | dev_attr->attr.mode = mode; | |
211 | dev_attr->show = show; | |
212 | dev_attr->store = store; | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | static void free_constraint_attributes(void) | |
218 | { | |
219 | int i; | |
220 | ||
221 | for (i = 0; i < MAX_CONSTRAINTS_PER_ZONE; ++i) { | |
222 | kfree(constraint_attrs[i].power_limit_attr.attr.name); | |
223 | kfree(constraint_attrs[i].time_window_attr.attr.name); | |
224 | kfree(constraint_attrs[i].name_attr.attr.name); | |
225 | kfree(constraint_attrs[i].max_power_attr.attr.name); | |
226 | kfree(constraint_attrs[i].min_power_attr.attr.name); | |
227 | kfree(constraint_attrs[i].max_time_window_attr.attr.name); | |
228 | kfree(constraint_attrs[i].min_time_window_attr.attr.name); | |
229 | } | |
230 | } | |
231 | ||
232 | static int seed_constraint_attributes(void) | |
233 | { | |
234 | int i; | |
235 | int ret; | |
236 | ||
237 | for (i = 0; i < MAX_CONSTRAINTS_PER_ZONE; ++i) { | |
238 | ret = create_constraint_attribute(i, "power_limit_uw", | |
239 | S_IWUSR | S_IRUGO, | |
240 | &constraint_attrs[i].power_limit_attr, | |
241 | show_constraint_power_limit_uw, | |
242 | store_constraint_power_limit_uw); | |
243 | if (ret) | |
244 | goto err_alloc; | |
245 | ret = create_constraint_attribute(i, "time_window_us", | |
246 | S_IWUSR | S_IRUGO, | |
247 | &constraint_attrs[i].time_window_attr, | |
248 | show_constraint_time_window_us, | |
249 | store_constraint_time_window_us); | |
250 | if (ret) | |
251 | goto err_alloc; | |
252 | ret = create_constraint_attribute(i, "name", S_IRUGO, | |
253 | &constraint_attrs[i].name_attr, | |
254 | show_constraint_name, | |
255 | NULL); | |
256 | if (ret) | |
257 | goto err_alloc; | |
258 | ret = create_constraint_attribute(i, "max_power_uw", S_IRUGO, | |
259 | &constraint_attrs[i].max_power_attr, | |
260 | show_constraint_max_power_uw, | |
261 | NULL); | |
262 | if (ret) | |
263 | goto err_alloc; | |
264 | ret = create_constraint_attribute(i, "min_power_uw", S_IRUGO, | |
265 | &constraint_attrs[i].min_power_attr, | |
266 | show_constraint_min_power_uw, | |
267 | NULL); | |
268 | if (ret) | |
269 | goto err_alloc; | |
270 | ret = create_constraint_attribute(i, "max_time_window_us", | |
271 | S_IRUGO, | |
272 | &constraint_attrs[i].max_time_window_attr, | |
273 | show_constraint_max_time_window_us, | |
274 | NULL); | |
275 | if (ret) | |
276 | goto err_alloc; | |
277 | ret = create_constraint_attribute(i, "min_time_window_us", | |
278 | S_IRUGO, | |
279 | &constraint_attrs[i].min_time_window_attr, | |
280 | show_constraint_min_time_window_us, | |
281 | NULL); | |
282 | if (ret) | |
283 | goto err_alloc; | |
284 | ||
285 | } | |
286 | ||
287 | return 0; | |
288 | ||
289 | err_alloc: | |
290 | free_constraint_attributes(); | |
291 | ||
292 | return ret; | |
293 | } | |
294 | ||
295 | static int create_constraints(struct powercap_zone *power_zone, | |
600c395b JL |
296 | int nr_constraints, |
297 | const struct powercap_zone_constraint_ops *const_ops) | |
75d2364e SP |
298 | { |
299 | int i; | |
300 | int ret = 0; | |
301 | int count; | |
302 | struct powercap_zone_constraint *pconst; | |
303 | ||
304 | if (!power_zone || !const_ops || !const_ops->get_power_limit_uw || | |
305 | !const_ops->set_power_limit_uw || | |
306 | !const_ops->get_time_window_us || | |
307 | !const_ops->set_time_window_us) | |
308 | return -EINVAL; | |
309 | ||
310 | count = power_zone->zone_attr_count; | |
311 | for (i = 0; i < nr_constraints; ++i) { | |
312 | pconst = &power_zone->constraints[i]; | |
313 | pconst->ops = const_ops; | |
314 | pconst->id = power_zone->const_id_cnt; | |
315 | power_zone->const_id_cnt++; | |
316 | power_zone->zone_dev_attrs[count++] = | |
317 | &constraint_attrs[i].power_limit_attr.attr; | |
318 | power_zone->zone_dev_attrs[count++] = | |
319 | &constraint_attrs[i].time_window_attr.attr; | |
320 | if (pconst->ops->get_name) | |
321 | power_zone->zone_dev_attrs[count++] = | |
322 | &constraint_attrs[i].name_attr.attr; | |
323 | if (pconst->ops->get_max_power_uw) | |
324 | power_zone->zone_dev_attrs[count++] = | |
325 | &constraint_attrs[i].max_power_attr.attr; | |
326 | if (pconst->ops->get_min_power_uw) | |
327 | power_zone->zone_dev_attrs[count++] = | |
328 | &constraint_attrs[i].min_power_attr.attr; | |
329 | if (pconst->ops->get_max_time_window_us) | |
330 | power_zone->zone_dev_attrs[count++] = | |
331 | &constraint_attrs[i].max_time_window_attr.attr; | |
332 | if (pconst->ops->get_min_time_window_us) | |
333 | power_zone->zone_dev_attrs[count++] = | |
334 | &constraint_attrs[i].min_time_window_attr.attr; | |
335 | } | |
336 | power_zone->zone_attr_count = count; | |
337 | ||
338 | return ret; | |
339 | } | |
340 | ||
341 | static bool control_type_valid(void *control_type) | |
342 | { | |
343 | struct powercap_control_type *pos = NULL; | |
344 | bool found = false; | |
345 | ||
346 | mutex_lock(&powercap_cntrl_list_lock); | |
347 | ||
348 | list_for_each_entry(pos, &powercap_cntrl_list, node) { | |
349 | if (pos == control_type) { | |
350 | found = true; | |
351 | break; | |
352 | } | |
353 | } | |
354 | mutex_unlock(&powercap_cntrl_list_lock); | |
355 | ||
356 | return found; | |
357 | } | |
358 | ||
359 | static ssize_t name_show(struct device *dev, | |
360 | struct device_attribute *attr, | |
361 | char *buf) | |
362 | { | |
363 | struct powercap_zone *power_zone = to_powercap_zone(dev); | |
364 | ||
365 | return sprintf(buf, "%s\n", power_zone->name); | |
366 | } | |
367 | ||
368 | static DEVICE_ATTR_RO(name); | |
369 | ||
370 | /* Create zone and attributes in sysfs */ | |
371 | static void create_power_zone_common_attributes( | |
372 | struct powercap_zone *power_zone) | |
373 | { | |
374 | int count = 0; | |
375 | ||
376 | power_zone->zone_dev_attrs[count++] = &dev_attr_name.attr; | |
377 | if (power_zone->ops->get_max_energy_range_uj) | |
378 | power_zone->zone_dev_attrs[count++] = | |
379 | &dev_attr_max_energy_range_uj.attr; | |
95677a9a SP |
380 | if (power_zone->ops->get_energy_uj) { |
381 | if (power_zone->ops->reset_energy_uj) | |
382 | dev_attr_energy_uj.attr.mode = S_IWUSR | S_IRUGO; | |
383 | else | |
384 | dev_attr_energy_uj.attr.mode = S_IRUGO; | |
75d2364e SP |
385 | power_zone->zone_dev_attrs[count++] = |
386 | &dev_attr_energy_uj.attr; | |
95677a9a | 387 | } |
75d2364e SP |
388 | if (power_zone->ops->get_power_uw) |
389 | power_zone->zone_dev_attrs[count++] = | |
390 | &dev_attr_power_uw.attr; | |
391 | if (power_zone->ops->get_max_power_range_uw) | |
392 | power_zone->zone_dev_attrs[count++] = | |
393 | &dev_attr_max_power_range_uw.attr; | |
394 | power_zone->zone_dev_attrs[count] = NULL; | |
395 | power_zone->zone_attr_count = count; | |
396 | } | |
397 | ||
398 | static void powercap_release(struct device *dev) | |
399 | { | |
400 | bool allocated; | |
401 | ||
402 | if (dev->parent) { | |
403 | struct powercap_zone *power_zone = to_powercap_zone(dev); | |
404 | ||
405 | /* Store flag as the release() may free memory */ | |
406 | allocated = power_zone->allocated; | |
407 | /* Remove id from parent idr struct */ | |
408 | idr_remove(power_zone->parent_idr, power_zone->id); | |
409 | /* Destroy idrs allocated for this zone */ | |
410 | idr_destroy(&power_zone->idr); | |
411 | kfree(power_zone->name); | |
412 | kfree(power_zone->zone_dev_attrs); | |
413 | kfree(power_zone->constraints); | |
414 | if (power_zone->ops->release) | |
415 | power_zone->ops->release(power_zone); | |
416 | if (allocated) | |
417 | kfree(power_zone); | |
418 | } else { | |
419 | struct powercap_control_type *control_type = | |
420 | to_powercap_control_type(dev); | |
421 | ||
422 | /* Store flag as the release() may free memory */ | |
423 | allocated = control_type->allocated; | |
424 | idr_destroy(&control_type->idr); | |
425 | mutex_destroy(&control_type->lock); | |
426 | if (control_type->ops && control_type->ops->release) | |
427 | control_type->ops->release(control_type); | |
428 | if (allocated) | |
429 | kfree(control_type); | |
430 | } | |
431 | } | |
432 | ||
433 | static ssize_t enabled_show(struct device *dev, | |
434 | struct device_attribute *attr, | |
435 | char *buf) | |
436 | { | |
437 | bool mode = true; | |
438 | ||
439 | /* Default is enabled */ | |
440 | if (dev->parent) { | |
441 | struct powercap_zone *power_zone = to_powercap_zone(dev); | |
442 | if (power_zone->ops->get_enable) | |
443 | if (power_zone->ops->get_enable(power_zone, &mode)) | |
444 | mode = false; | |
445 | } else { | |
446 | struct powercap_control_type *control_type = | |
447 | to_powercap_control_type(dev); | |
448 | if (control_type->ops && control_type->ops->get_enable) | |
449 | if (control_type->ops->get_enable(control_type, &mode)) | |
450 | mode = false; | |
451 | } | |
452 | ||
453 | return sprintf(buf, "%d\n", mode); | |
454 | } | |
455 | ||
456 | static ssize_t enabled_store(struct device *dev, | |
457 | struct device_attribute *attr, | |
458 | const char *buf, size_t len) | |
459 | { | |
460 | bool mode; | |
461 | ||
462 | if (strtobool(buf, &mode)) | |
463 | return -EINVAL; | |
464 | if (dev->parent) { | |
465 | struct powercap_zone *power_zone = to_powercap_zone(dev); | |
466 | if (power_zone->ops->set_enable) | |
467 | if (!power_zone->ops->set_enable(power_zone, mode)) | |
468 | return len; | |
469 | } else { | |
470 | struct powercap_control_type *control_type = | |
471 | to_powercap_control_type(dev); | |
472 | if (control_type->ops && control_type->ops->set_enable) | |
473 | if (!control_type->ops->set_enable(control_type, mode)) | |
474 | return len; | |
475 | } | |
476 | ||
477 | return -ENOSYS; | |
478 | } | |
479 | ||
9e3410b7 TR |
480 | static DEVICE_ATTR_RW(enabled); |
481 | ||
482 | static struct attribute *powercap_attrs[] = { | |
483 | &dev_attr_enabled.attr, | |
484 | NULL, | |
75d2364e | 485 | }; |
9e3410b7 | 486 | ATTRIBUTE_GROUPS(powercap); |
75d2364e SP |
487 | |
488 | static struct class powercap_class = { | |
489 | .name = "powercap", | |
490 | .dev_release = powercap_release, | |
9e3410b7 | 491 | .dev_groups = powercap_groups, |
75d2364e SP |
492 | }; |
493 | ||
494 | struct powercap_zone *powercap_register_zone( | |
600c395b JL |
495 | struct powercap_zone *power_zone, |
496 | struct powercap_control_type *control_type, | |
497 | const char *name, | |
498 | struct powercap_zone *parent, | |
499 | const struct powercap_zone_ops *ops, | |
500 | int nr_constraints, | |
501 | const struct powercap_zone_constraint_ops *const_ops) | |
75d2364e SP |
502 | { |
503 | int result; | |
504 | int nr_attrs; | |
505 | ||
506 | if (!name || !control_type || !ops || | |
507 | nr_constraints > MAX_CONSTRAINTS_PER_ZONE || | |
508 | (!ops->get_energy_uj && !ops->get_power_uw) || | |
509 | !control_type_valid(control_type)) | |
510 | return ERR_PTR(-EINVAL); | |
511 | ||
512 | if (power_zone) { | |
513 | if (!ops->release) | |
514 | return ERR_PTR(-EINVAL); | |
515 | memset(power_zone, 0, sizeof(*power_zone)); | |
516 | } else { | |
517 | power_zone = kzalloc(sizeof(*power_zone), GFP_KERNEL); | |
518 | if (!power_zone) | |
519 | return ERR_PTR(-ENOMEM); | |
520 | power_zone->allocated = true; | |
521 | } | |
522 | power_zone->ops = ops; | |
523 | power_zone->control_type_inst = control_type; | |
524 | if (!parent) { | |
525 | power_zone->dev.parent = &control_type->dev; | |
526 | power_zone->parent_idr = &control_type->idr; | |
527 | } else { | |
528 | power_zone->dev.parent = &parent->dev; | |
529 | power_zone->parent_idr = &parent->idr; | |
530 | } | |
531 | power_zone->dev.class = &powercap_class; | |
532 | ||
533 | mutex_lock(&control_type->lock); | |
534 | /* Using idr to get the unique id */ | |
535 | result = idr_alloc(power_zone->parent_idr, NULL, 0, 0, GFP_KERNEL); | |
536 | if (result < 0) | |
537 | goto err_idr_alloc; | |
538 | ||
539 | power_zone->id = result; | |
540 | idr_init(&power_zone->idr); | |
541 | power_zone->name = kstrdup(name, GFP_KERNEL); | |
542 | if (!power_zone->name) | |
543 | goto err_name_alloc; | |
544 | dev_set_name(&power_zone->dev, "%s:%x", | |
545 | dev_name(power_zone->dev.parent), | |
546 | power_zone->id); | |
547 | power_zone->constraints = kzalloc(sizeof(*power_zone->constraints) * | |
548 | nr_constraints, GFP_KERNEL); | |
549 | if (!power_zone->constraints) | |
550 | goto err_const_alloc; | |
551 | ||
552 | nr_attrs = nr_constraints * POWERCAP_CONSTRAINTS_ATTRS + | |
553 | POWERCAP_ZONE_MAX_ATTRS + 1; | |
554 | power_zone->zone_dev_attrs = kzalloc(sizeof(void *) * | |
555 | nr_attrs, GFP_KERNEL); | |
556 | if (!power_zone->zone_dev_attrs) | |
557 | goto err_attr_alloc; | |
558 | create_power_zone_common_attributes(power_zone); | |
559 | result = create_constraints(power_zone, nr_constraints, const_ops); | |
560 | if (result) | |
561 | goto err_dev_ret; | |
562 | ||
563 | power_zone->zone_dev_attrs[power_zone->zone_attr_count] = NULL; | |
564 | power_zone->dev_zone_attr_group.attrs = power_zone->zone_dev_attrs; | |
565 | power_zone->dev_attr_groups[0] = &power_zone->dev_zone_attr_group; | |
566 | power_zone->dev_attr_groups[1] = NULL; | |
567 | power_zone->dev.groups = power_zone->dev_attr_groups; | |
568 | result = device_register(&power_zone->dev); | |
569 | if (result) | |
570 | goto err_dev_ret; | |
571 | ||
572 | control_type->nr_zones++; | |
573 | mutex_unlock(&control_type->lock); | |
574 | ||
575 | return power_zone; | |
576 | ||
577 | err_dev_ret: | |
578 | kfree(power_zone->zone_dev_attrs); | |
579 | err_attr_alloc: | |
580 | kfree(power_zone->constraints); | |
581 | err_const_alloc: | |
582 | kfree(power_zone->name); | |
583 | err_name_alloc: | |
584 | idr_remove(power_zone->parent_idr, power_zone->id); | |
585 | err_idr_alloc: | |
586 | if (power_zone->allocated) | |
587 | kfree(power_zone); | |
588 | mutex_unlock(&control_type->lock); | |
589 | ||
590 | return ERR_PTR(result); | |
591 | } | |
592 | EXPORT_SYMBOL_GPL(powercap_register_zone); | |
593 | ||
594 | int powercap_unregister_zone(struct powercap_control_type *control_type, | |
595 | struct powercap_zone *power_zone) | |
596 | { | |
597 | if (!power_zone || !control_type) | |
598 | return -EINVAL; | |
599 | ||
600 | mutex_lock(&control_type->lock); | |
601 | control_type->nr_zones--; | |
602 | mutex_unlock(&control_type->lock); | |
603 | ||
604 | device_unregister(&power_zone->dev); | |
605 | ||
606 | return 0; | |
607 | } | |
608 | EXPORT_SYMBOL_GPL(powercap_unregister_zone); | |
609 | ||
610 | struct powercap_control_type *powercap_register_control_type( | |
611 | struct powercap_control_type *control_type, | |
612 | const char *name, | |
613 | const struct powercap_control_type_ops *ops) | |
614 | { | |
615 | int result; | |
616 | ||
617 | if (!name) | |
618 | return ERR_PTR(-EINVAL); | |
619 | if (control_type) { | |
620 | if (!ops || !ops->release) | |
621 | return ERR_PTR(-EINVAL); | |
622 | memset(control_type, 0, sizeof(*control_type)); | |
623 | } else { | |
624 | control_type = kzalloc(sizeof(*control_type), GFP_KERNEL); | |
625 | if (!control_type) | |
626 | return ERR_PTR(-ENOMEM); | |
627 | control_type->allocated = true; | |
628 | } | |
629 | mutex_init(&control_type->lock); | |
630 | control_type->ops = ops; | |
631 | INIT_LIST_HEAD(&control_type->node); | |
632 | control_type->dev.class = &powercap_class; | |
08ff4cbe | 633 | dev_set_name(&control_type->dev, "%s", name); |
75d2364e SP |
634 | result = device_register(&control_type->dev); |
635 | if (result) { | |
636 | if (control_type->allocated) | |
637 | kfree(control_type); | |
638 | return ERR_PTR(result); | |
639 | } | |
640 | idr_init(&control_type->idr); | |
641 | ||
642 | mutex_lock(&powercap_cntrl_list_lock); | |
643 | list_add_tail(&control_type->node, &powercap_cntrl_list); | |
644 | mutex_unlock(&powercap_cntrl_list_lock); | |
645 | ||
646 | return control_type; | |
647 | } | |
648 | EXPORT_SYMBOL_GPL(powercap_register_control_type); | |
649 | ||
650 | int powercap_unregister_control_type(struct powercap_control_type *control_type) | |
651 | { | |
652 | struct powercap_control_type *pos = NULL; | |
653 | ||
654 | if (control_type->nr_zones) { | |
655 | dev_err(&control_type->dev, "Zones of this type still not freed\n"); | |
656 | return -EINVAL; | |
657 | } | |
658 | mutex_lock(&powercap_cntrl_list_lock); | |
659 | list_for_each_entry(pos, &powercap_cntrl_list, node) { | |
660 | if (pos == control_type) { | |
661 | list_del(&control_type->node); | |
662 | mutex_unlock(&powercap_cntrl_list_lock); | |
663 | device_unregister(&control_type->dev); | |
664 | return 0; | |
665 | } | |
666 | } | |
667 | mutex_unlock(&powercap_cntrl_list_lock); | |
668 | ||
669 | return -ENODEV; | |
670 | } | |
671 | EXPORT_SYMBOL_GPL(powercap_unregister_control_type); | |
672 | ||
673 | static int __init powercap_init(void) | |
674 | { | |
675 | int result = 0; | |
676 | ||
677 | result = seed_constraint_attributes(); | |
678 | if (result) | |
679 | return result; | |
680 | ||
681 | result = class_register(&powercap_class); | |
682 | ||
683 | return result; | |
684 | } | |
685 | ||
686 | device_initcall(powercap_init); | |
687 | ||
688 | MODULE_DESCRIPTION("PowerCap sysfs Driver"); | |
689 | MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); | |
690 | MODULE_LICENSE("GPL v2"); |