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1 | // SPDX-License-Identifier: GPL-2.0-only | |
2 | /* | |
3 | * Enclosure Services | |
4 | * | |
5 | * Copyright (C) 2008 James Bottomley <James.Bottomley@HansenPartnership.com> | |
6 | * | |
7 | **----------------------------------------------------------------------------- | |
8 | ** | |
9 | ** | |
10 | **----------------------------------------------------------------------------- | |
11 | */ | |
12 | #include <linux/device.h> | |
13 | #include <linux/enclosure.h> | |
14 | #include <linux/err.h> | |
15 | #include <linux/list.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/mutex.h> | |
19 | #include <linux/slab.h> | |
20 | ||
21 | static LIST_HEAD(container_list); | |
22 | static DEFINE_MUTEX(container_list_lock); | |
23 | static struct class enclosure_class; | |
24 | ||
25 | /** | |
26 | * enclosure_find - find an enclosure given a parent device | |
27 | * @dev: the parent to match against | |
28 | * @start: Optional enclosure device to start from (NULL if none) | |
29 | * | |
30 | * Looks through the list of registered enclosures to find all those | |
31 | * with @dev as a parent. Returns NULL if no enclosure is | |
32 | * found. @start can be used as a starting point to obtain multiple | |
33 | * enclosures per parent (should begin with NULL and then be set to | |
34 | * each returned enclosure device). Obtains a reference to the | |
35 | * enclosure class device which must be released with device_put(). | |
36 | * If @start is not NULL, a reference must be taken on it which is | |
37 | * released before returning (this allows a loop through all | |
38 | * enclosures to exit with only the reference on the enclosure of | |
39 | * interest held). Note that the @dev may correspond to the actual | |
40 | * device housing the enclosure, in which case no iteration via @start | |
41 | * is required. | |
42 | */ | |
43 | struct enclosure_device *enclosure_find(struct device *dev, | |
44 | struct enclosure_device *start) | |
45 | { | |
46 | struct enclosure_device *edev; | |
47 | ||
48 | mutex_lock(&container_list_lock); | |
49 | edev = list_prepare_entry(start, &container_list, node); | |
50 | if (start) | |
51 | put_device(&start->edev); | |
52 | ||
53 | list_for_each_entry_continue(edev, &container_list, node) { | |
54 | struct device *parent = edev->edev.parent; | |
55 | /* parent might not be immediate, so iterate up to | |
56 | * the root of the tree if necessary */ | |
57 | while (parent) { | |
58 | if (parent == dev) { | |
59 | get_device(&edev->edev); | |
60 | mutex_unlock(&container_list_lock); | |
61 | return edev; | |
62 | } | |
63 | parent = parent->parent; | |
64 | } | |
65 | } | |
66 | mutex_unlock(&container_list_lock); | |
67 | ||
68 | return NULL; | |
69 | } | |
70 | EXPORT_SYMBOL_GPL(enclosure_find); | |
71 | ||
72 | /** | |
73 | * enclosure_for_each_device - calls a function for each enclosure | |
74 | * @fn: the function to call | |
75 | * @data: the data to pass to each call | |
76 | * | |
77 | * Loops over all the enclosures calling the function. | |
78 | * | |
79 | * Note, this function uses a mutex which will be held across calls to | |
80 | * @fn, so it must have non atomic context, and @fn may (although it | |
81 | * should not) sleep or otherwise cause the mutex to be held for | |
82 | * indefinite periods | |
83 | */ | |
84 | int enclosure_for_each_device(int (*fn)(struct enclosure_device *, void *), | |
85 | void *data) | |
86 | { | |
87 | int error = 0; | |
88 | struct enclosure_device *edev; | |
89 | ||
90 | mutex_lock(&container_list_lock); | |
91 | list_for_each_entry(edev, &container_list, node) { | |
92 | error = fn(edev, data); | |
93 | if (error) | |
94 | break; | |
95 | } | |
96 | mutex_unlock(&container_list_lock); | |
97 | ||
98 | return error; | |
99 | } | |
100 | EXPORT_SYMBOL_GPL(enclosure_for_each_device); | |
101 | ||
102 | /** | |
103 | * enclosure_register - register device as an enclosure | |
104 | * | |
105 | * @dev: device containing the enclosure | |
106 | * @name: chosen device name | |
107 | * @components: number of components in the enclosure | |
108 | * @cb: platform call-backs | |
109 | * | |
110 | * This sets up the device for being an enclosure. Note that @dev does | |
111 | * not have to be a dedicated enclosure device. It may be some other type | |
112 | * of device that additionally responds to enclosure services | |
113 | */ | |
114 | struct enclosure_device * | |
115 | enclosure_register(struct device *dev, const char *name, int components, | |
116 | struct enclosure_component_callbacks *cb) | |
117 | { | |
118 | struct enclosure_device *edev = | |
119 | kzalloc(struct_size(edev, component, components), GFP_KERNEL); | |
120 | int err, i; | |
121 | ||
122 | BUG_ON(!cb); | |
123 | ||
124 | if (!edev) | |
125 | return ERR_PTR(-ENOMEM); | |
126 | ||
127 | edev->components = components; | |
128 | ||
129 | edev->edev.class = &enclosure_class; | |
130 | edev->edev.parent = get_device(dev); | |
131 | edev->cb = cb; | |
132 | dev_set_name(&edev->edev, "%s", name); | |
133 | err = device_register(&edev->edev); | |
134 | if (err) | |
135 | goto err; | |
136 | ||
137 | for (i = 0; i < components; i++) { | |
138 | edev->component[i].number = -1; | |
139 | edev->component[i].slot = -1; | |
140 | edev->component[i].power_status = -1; | |
141 | } | |
142 | ||
143 | mutex_lock(&container_list_lock); | |
144 | list_add_tail(&edev->node, &container_list); | |
145 | mutex_unlock(&container_list_lock); | |
146 | ||
147 | return edev; | |
148 | ||
149 | err: | |
150 | put_device(edev->edev.parent); | |
151 | kfree(edev); | |
152 | return ERR_PTR(err); | |
153 | } | |
154 | EXPORT_SYMBOL_GPL(enclosure_register); | |
155 | ||
156 | static struct enclosure_component_callbacks enclosure_null_callbacks; | |
157 | ||
158 | /** | |
159 | * enclosure_unregister - remove an enclosure | |
160 | * | |
161 | * @edev: the registered enclosure to remove; | |
162 | */ | |
163 | void enclosure_unregister(struct enclosure_device *edev) | |
164 | { | |
165 | int i; | |
166 | ||
167 | mutex_lock(&container_list_lock); | |
168 | list_del(&edev->node); | |
169 | mutex_unlock(&container_list_lock); | |
170 | ||
171 | for (i = 0; i < edev->components; i++) | |
172 | if (edev->component[i].number != -1) | |
173 | device_unregister(&edev->component[i].cdev); | |
174 | ||
175 | /* prevent any callbacks into service user */ | |
176 | edev->cb = &enclosure_null_callbacks; | |
177 | device_unregister(&edev->edev); | |
178 | } | |
179 | EXPORT_SYMBOL_GPL(enclosure_unregister); | |
180 | ||
181 | #define ENCLOSURE_NAME_SIZE 64 | |
182 | #define COMPONENT_NAME_SIZE 64 | |
183 | ||
184 | static void enclosure_link_name(struct enclosure_component *cdev, char *name) | |
185 | { | |
186 | strcpy(name, "enclosure_device:"); | |
187 | strcat(name, dev_name(&cdev->cdev)); | |
188 | } | |
189 | ||
190 | static void enclosure_remove_links(struct enclosure_component *cdev) | |
191 | { | |
192 | char name[ENCLOSURE_NAME_SIZE]; | |
193 | ||
194 | enclosure_link_name(cdev, name); | |
195 | ||
196 | /* | |
197 | * In odd circumstances, like multipath devices, something else may | |
198 | * already have removed the links, so check for this condition first. | |
199 | */ | |
200 | if (cdev->dev->kobj.sd) | |
201 | sysfs_remove_link(&cdev->dev->kobj, name); | |
202 | ||
203 | if (cdev->cdev.kobj.sd) | |
204 | sysfs_remove_link(&cdev->cdev.kobj, "device"); | |
205 | } | |
206 | ||
207 | static int enclosure_add_links(struct enclosure_component *cdev) | |
208 | { | |
209 | int error; | |
210 | char name[ENCLOSURE_NAME_SIZE]; | |
211 | ||
212 | error = sysfs_create_link(&cdev->cdev.kobj, &cdev->dev->kobj, "device"); | |
213 | if (error) | |
214 | return error; | |
215 | ||
216 | enclosure_link_name(cdev, name); | |
217 | error = sysfs_create_link(&cdev->dev->kobj, &cdev->cdev.kobj, name); | |
218 | if (error) | |
219 | sysfs_remove_link(&cdev->cdev.kobj, "device"); | |
220 | ||
221 | return error; | |
222 | } | |
223 | ||
224 | static void enclosure_release(struct device *cdev) | |
225 | { | |
226 | struct enclosure_device *edev = to_enclosure_device(cdev); | |
227 | ||
228 | put_device(cdev->parent); | |
229 | kfree(edev); | |
230 | } | |
231 | ||
232 | static void enclosure_component_release(struct device *dev) | |
233 | { | |
234 | struct enclosure_component *cdev = to_enclosure_component(dev); | |
235 | ||
236 | if (cdev->dev) { | |
237 | enclosure_remove_links(cdev); | |
238 | put_device(cdev->dev); | |
239 | } | |
240 | put_device(dev->parent); | |
241 | } | |
242 | ||
243 | static struct enclosure_component * | |
244 | enclosure_component_find_by_name(struct enclosure_device *edev, | |
245 | const char *name) | |
246 | { | |
247 | int i; | |
248 | const char *cname; | |
249 | struct enclosure_component *ecomp; | |
250 | ||
251 | if (!edev || !name || !name[0]) | |
252 | return NULL; | |
253 | ||
254 | for (i = 0; i < edev->components; i++) { | |
255 | ecomp = &edev->component[i]; | |
256 | cname = dev_name(&ecomp->cdev); | |
257 | if (ecomp->number != -1 && | |
258 | cname && cname[0] && | |
259 | !strcmp(cname, name)) | |
260 | return ecomp; | |
261 | } | |
262 | ||
263 | return NULL; | |
264 | } | |
265 | ||
266 | static const struct attribute_group *enclosure_component_groups[]; | |
267 | ||
268 | /** | |
269 | * enclosure_component_alloc - prepare a new enclosure component | |
270 | * @edev: the enclosure to add the component | |
271 | * @number: the device number | |
272 | * @type: the type of component being added | |
273 | * @name: an optional name to appear in sysfs (leave NULL if none) | |
274 | * | |
275 | * The name is optional for enclosures that give their components a unique | |
276 | * name. If not, leave the field NULL and a name will be assigned. | |
277 | * | |
278 | * Returns a pointer to the enclosure component or an error. | |
279 | */ | |
280 | struct enclosure_component * | |
281 | enclosure_component_alloc(struct enclosure_device *edev, | |
282 | unsigned int number, | |
283 | enum enclosure_component_type type, | |
284 | const char *name) | |
285 | { | |
286 | struct enclosure_component *ecomp; | |
287 | struct device *cdev; | |
288 | int i; | |
289 | char newname[COMPONENT_NAME_SIZE]; | |
290 | ||
291 | if (number >= edev->components) | |
292 | return ERR_PTR(-EINVAL); | |
293 | ||
294 | ecomp = &edev->component[number]; | |
295 | ||
296 | if (ecomp->number != -1) | |
297 | return ERR_PTR(-EINVAL); | |
298 | ||
299 | ecomp->type = type; | |
300 | ecomp->number = number; | |
301 | cdev = &ecomp->cdev; | |
302 | cdev->parent = get_device(&edev->edev); | |
303 | ||
304 | if (name && name[0]) { | |
305 | /* Some hardware (e.g. enclosure in RX300 S6) has components | |
306 | * with non unique names. Registering duplicates in sysfs | |
307 | * will lead to warnings during bootup. So make the names | |
308 | * unique by appending consecutive numbers -1, -2, ... */ | |
309 | i = 1; | |
310 | snprintf(newname, COMPONENT_NAME_SIZE, | |
311 | "%s", name); | |
312 | while (enclosure_component_find_by_name(edev, newname)) | |
313 | snprintf(newname, COMPONENT_NAME_SIZE, | |
314 | "%s-%i", name, i++); | |
315 | dev_set_name(cdev, "%s", newname); | |
316 | } else | |
317 | dev_set_name(cdev, "%u", number); | |
318 | ||
319 | cdev->release = enclosure_component_release; | |
320 | cdev->groups = enclosure_component_groups; | |
321 | ||
322 | return ecomp; | |
323 | } | |
324 | EXPORT_SYMBOL_GPL(enclosure_component_alloc); | |
325 | ||
326 | /** | |
327 | * enclosure_component_register - publishes an initialized enclosure component | |
328 | * @ecomp: component to add | |
329 | * | |
330 | * Returns 0 on successful registration, releases the component otherwise | |
331 | */ | |
332 | int enclosure_component_register(struct enclosure_component *ecomp) | |
333 | { | |
334 | struct device *cdev; | |
335 | int err; | |
336 | ||
337 | cdev = &ecomp->cdev; | |
338 | err = device_register(cdev); | |
339 | if (err) { | |
340 | ecomp->number = -1; | |
341 | put_device(cdev); | |
342 | return err; | |
343 | } | |
344 | ||
345 | return 0; | |
346 | } | |
347 | EXPORT_SYMBOL_GPL(enclosure_component_register); | |
348 | ||
349 | /** | |
350 | * enclosure_add_device - add a device as being part of an enclosure | |
351 | * @edev: the enclosure device being added to. | |
352 | * @component: the number of the component | |
353 | * @dev: the device being added | |
354 | * | |
355 | * Declares a real device to reside in slot (or identifier) @num of an | |
356 | * enclosure. This will cause the relevant sysfs links to appear. | |
357 | * This function may also be used to change a device associated with | |
358 | * an enclosure without having to call enclosure_remove_device() in | |
359 | * between. | |
360 | * | |
361 | * Returns zero on success or an error. | |
362 | */ | |
363 | int enclosure_add_device(struct enclosure_device *edev, int component, | |
364 | struct device *dev) | |
365 | { | |
366 | struct enclosure_component *cdev; | |
367 | int err; | |
368 | ||
369 | if (!edev || component >= edev->components) | |
370 | return -EINVAL; | |
371 | ||
372 | cdev = &edev->component[component]; | |
373 | ||
374 | if (cdev->dev == dev) | |
375 | return -EEXIST; | |
376 | ||
377 | if (cdev->dev) { | |
378 | enclosure_remove_links(cdev); | |
379 | put_device(cdev->dev); | |
380 | } | |
381 | cdev->dev = get_device(dev); | |
382 | err = enclosure_add_links(cdev); | |
383 | if (err) { | |
384 | put_device(cdev->dev); | |
385 | cdev->dev = NULL; | |
386 | } | |
387 | return err; | |
388 | } | |
389 | EXPORT_SYMBOL_GPL(enclosure_add_device); | |
390 | ||
391 | /** | |
392 | * enclosure_remove_device - remove a device from an enclosure | |
393 | * @edev: the enclosure device | |
394 | * @dev: device to remove/put | |
395 | * | |
396 | * Returns zero on success or an error. | |
397 | * | |
398 | */ | |
399 | int enclosure_remove_device(struct enclosure_device *edev, struct device *dev) | |
400 | { | |
401 | struct enclosure_component *cdev; | |
402 | int i; | |
403 | ||
404 | if (!edev || !dev) | |
405 | return -EINVAL; | |
406 | ||
407 | for (i = 0; i < edev->components; i++) { | |
408 | cdev = &edev->component[i]; | |
409 | if (cdev->dev == dev) { | |
410 | enclosure_remove_links(cdev); | |
411 | put_device(dev); | |
412 | cdev->dev = NULL; | |
413 | return 0; | |
414 | } | |
415 | } | |
416 | return -ENODEV; | |
417 | } | |
418 | EXPORT_SYMBOL_GPL(enclosure_remove_device); | |
419 | ||
420 | /* | |
421 | * sysfs pieces below | |
422 | */ | |
423 | ||
424 | static ssize_t components_show(struct device *cdev, | |
425 | struct device_attribute *attr, char *buf) | |
426 | { | |
427 | struct enclosure_device *edev = to_enclosure_device(cdev); | |
428 | ||
429 | return snprintf(buf, 40, "%d\n", edev->components); | |
430 | } | |
431 | static DEVICE_ATTR_RO(components); | |
432 | ||
433 | static ssize_t id_show(struct device *cdev, | |
434 | struct device_attribute *attr, | |
435 | char *buf) | |
436 | { | |
437 | struct enclosure_device *edev = to_enclosure_device(cdev); | |
438 | ||
439 | if (edev->cb->show_id) | |
440 | return edev->cb->show_id(edev, buf); | |
441 | return -EINVAL; | |
442 | } | |
443 | static DEVICE_ATTR_RO(id); | |
444 | ||
445 | static struct attribute *enclosure_class_attrs[] = { | |
446 | &dev_attr_components.attr, | |
447 | &dev_attr_id.attr, | |
448 | NULL, | |
449 | }; | |
450 | ATTRIBUTE_GROUPS(enclosure_class); | |
451 | ||
452 | static struct class enclosure_class = { | |
453 | .name = "enclosure", | |
454 | .owner = THIS_MODULE, | |
455 | .dev_release = enclosure_release, | |
456 | .dev_groups = enclosure_class_groups, | |
457 | }; | |
458 | ||
459 | static const char *const enclosure_status[] = { | |
460 | [ENCLOSURE_STATUS_UNSUPPORTED] = "unsupported", | |
461 | [ENCLOSURE_STATUS_OK] = "OK", | |
462 | [ENCLOSURE_STATUS_CRITICAL] = "critical", | |
463 | [ENCLOSURE_STATUS_NON_CRITICAL] = "non-critical", | |
464 | [ENCLOSURE_STATUS_UNRECOVERABLE] = "unrecoverable", | |
465 | [ENCLOSURE_STATUS_NOT_INSTALLED] = "not installed", | |
466 | [ENCLOSURE_STATUS_UNKNOWN] = "unknown", | |
467 | [ENCLOSURE_STATUS_UNAVAILABLE] = "unavailable", | |
468 | [ENCLOSURE_STATUS_MAX] = NULL, | |
469 | }; | |
470 | ||
471 | static const char *const enclosure_type[] = { | |
472 | [ENCLOSURE_COMPONENT_DEVICE] = "device", | |
473 | [ENCLOSURE_COMPONENT_ARRAY_DEVICE] = "array device", | |
474 | }; | |
475 | ||
476 | static ssize_t get_component_fault(struct device *cdev, | |
477 | struct device_attribute *attr, char *buf) | |
478 | { | |
479 | struct enclosure_device *edev = to_enclosure_device(cdev->parent); | |
480 | struct enclosure_component *ecomp = to_enclosure_component(cdev); | |
481 | ||
482 | if (edev->cb->get_fault) | |
483 | edev->cb->get_fault(edev, ecomp); | |
484 | return snprintf(buf, 40, "%d\n", ecomp->fault); | |
485 | } | |
486 | ||
487 | static ssize_t set_component_fault(struct device *cdev, | |
488 | struct device_attribute *attr, | |
489 | const char *buf, size_t count) | |
490 | { | |
491 | struct enclosure_device *edev = to_enclosure_device(cdev->parent); | |
492 | struct enclosure_component *ecomp = to_enclosure_component(cdev); | |
493 | int val = simple_strtoul(buf, NULL, 0); | |
494 | ||
495 | if (edev->cb->set_fault) | |
496 | edev->cb->set_fault(edev, ecomp, val); | |
497 | return count; | |
498 | } | |
499 | ||
500 | static ssize_t get_component_status(struct device *cdev, | |
501 | struct device_attribute *attr,char *buf) | |
502 | { | |
503 | struct enclosure_device *edev = to_enclosure_device(cdev->parent); | |
504 | struct enclosure_component *ecomp = to_enclosure_component(cdev); | |
505 | ||
506 | if (edev->cb->get_status) | |
507 | edev->cb->get_status(edev, ecomp); | |
508 | return snprintf(buf, 40, "%s\n", enclosure_status[ecomp->status]); | |
509 | } | |
510 | ||
511 | static ssize_t set_component_status(struct device *cdev, | |
512 | struct device_attribute *attr, | |
513 | const char *buf, size_t count) | |
514 | { | |
515 | struct enclosure_device *edev = to_enclosure_device(cdev->parent); | |
516 | struct enclosure_component *ecomp = to_enclosure_component(cdev); | |
517 | int i; | |
518 | ||
519 | for (i = 0; enclosure_status[i]; i++) { | |
520 | if (strncmp(buf, enclosure_status[i], | |
521 | strlen(enclosure_status[i])) == 0 && | |
522 | (buf[strlen(enclosure_status[i])] == '\n' || | |
523 | buf[strlen(enclosure_status[i])] == '\0')) | |
524 | break; | |
525 | } | |
526 | ||
527 | if (enclosure_status[i] && edev->cb->set_status) { | |
528 | edev->cb->set_status(edev, ecomp, i); | |
529 | return count; | |
530 | } else | |
531 | return -EINVAL; | |
532 | } | |
533 | ||
534 | static ssize_t get_component_active(struct device *cdev, | |
535 | struct device_attribute *attr, char *buf) | |
536 | { | |
537 | struct enclosure_device *edev = to_enclosure_device(cdev->parent); | |
538 | struct enclosure_component *ecomp = to_enclosure_component(cdev); | |
539 | ||
540 | if (edev->cb->get_active) | |
541 | edev->cb->get_active(edev, ecomp); | |
542 | return snprintf(buf, 40, "%d\n", ecomp->active); | |
543 | } | |
544 | ||
545 | static ssize_t set_component_active(struct device *cdev, | |
546 | struct device_attribute *attr, | |
547 | const char *buf, size_t count) | |
548 | { | |
549 | struct enclosure_device *edev = to_enclosure_device(cdev->parent); | |
550 | struct enclosure_component *ecomp = to_enclosure_component(cdev); | |
551 | int val = simple_strtoul(buf, NULL, 0); | |
552 | ||
553 | if (edev->cb->set_active) | |
554 | edev->cb->set_active(edev, ecomp, val); | |
555 | return count; | |
556 | } | |
557 | ||
558 | static ssize_t get_component_locate(struct device *cdev, | |
559 | struct device_attribute *attr, char *buf) | |
560 | { | |
561 | struct enclosure_device *edev = to_enclosure_device(cdev->parent); | |
562 | struct enclosure_component *ecomp = to_enclosure_component(cdev); | |
563 | ||
564 | if (edev->cb->get_locate) | |
565 | edev->cb->get_locate(edev, ecomp); | |
566 | return snprintf(buf, 40, "%d\n", ecomp->locate); | |
567 | } | |
568 | ||
569 | static ssize_t set_component_locate(struct device *cdev, | |
570 | struct device_attribute *attr, | |
571 | const char *buf, size_t count) | |
572 | { | |
573 | struct enclosure_device *edev = to_enclosure_device(cdev->parent); | |
574 | struct enclosure_component *ecomp = to_enclosure_component(cdev); | |
575 | int val = simple_strtoul(buf, NULL, 0); | |
576 | ||
577 | if (edev->cb->set_locate) | |
578 | edev->cb->set_locate(edev, ecomp, val); | |
579 | return count; | |
580 | } | |
581 | ||
582 | static ssize_t get_component_power_status(struct device *cdev, | |
583 | struct device_attribute *attr, | |
584 | char *buf) | |
585 | { | |
586 | struct enclosure_device *edev = to_enclosure_device(cdev->parent); | |
587 | struct enclosure_component *ecomp = to_enclosure_component(cdev); | |
588 | ||
589 | if (edev->cb->get_power_status) | |
590 | edev->cb->get_power_status(edev, ecomp); | |
591 | ||
592 | /* If still uninitialized, the callback failed or does not exist. */ | |
593 | if (ecomp->power_status == -1) | |
594 | return (edev->cb->get_power_status) ? -EIO : -ENOTTY; | |
595 | ||
596 | return snprintf(buf, 40, "%s\n", ecomp->power_status ? "on" : "off"); | |
597 | } | |
598 | ||
599 | static ssize_t set_component_power_status(struct device *cdev, | |
600 | struct device_attribute *attr, | |
601 | const char *buf, size_t count) | |
602 | { | |
603 | struct enclosure_device *edev = to_enclosure_device(cdev->parent); | |
604 | struct enclosure_component *ecomp = to_enclosure_component(cdev); | |
605 | int val; | |
606 | ||
607 | if (strncmp(buf, "on", 2) == 0 && | |
608 | (buf[2] == '\n' || buf[2] == '\0')) | |
609 | val = 1; | |
610 | else if (strncmp(buf, "off", 3) == 0 && | |
611 | (buf[3] == '\n' || buf[3] == '\0')) | |
612 | val = 0; | |
613 | else | |
614 | return -EINVAL; | |
615 | ||
616 | if (edev->cb->set_power_status) | |
617 | edev->cb->set_power_status(edev, ecomp, val); | |
618 | return count; | |
619 | } | |
620 | ||
621 | static ssize_t get_component_type(struct device *cdev, | |
622 | struct device_attribute *attr, char *buf) | |
623 | { | |
624 | struct enclosure_component *ecomp = to_enclosure_component(cdev); | |
625 | ||
626 | return snprintf(buf, 40, "%s\n", enclosure_type[ecomp->type]); | |
627 | } | |
628 | ||
629 | static ssize_t get_component_slot(struct device *cdev, | |
630 | struct device_attribute *attr, char *buf) | |
631 | { | |
632 | struct enclosure_component *ecomp = to_enclosure_component(cdev); | |
633 | int slot; | |
634 | ||
635 | /* if the enclosure does not override then use 'number' as a stand-in */ | |
636 | if (ecomp->slot >= 0) | |
637 | slot = ecomp->slot; | |
638 | else | |
639 | slot = ecomp->number; | |
640 | ||
641 | return snprintf(buf, 40, "%d\n", slot); | |
642 | } | |
643 | ||
644 | static DEVICE_ATTR(fault, S_IRUGO | S_IWUSR, get_component_fault, | |
645 | set_component_fault); | |
646 | static DEVICE_ATTR(status, S_IRUGO | S_IWUSR, get_component_status, | |
647 | set_component_status); | |
648 | static DEVICE_ATTR(active, S_IRUGO | S_IWUSR, get_component_active, | |
649 | set_component_active); | |
650 | static DEVICE_ATTR(locate, S_IRUGO | S_IWUSR, get_component_locate, | |
651 | set_component_locate); | |
652 | static DEVICE_ATTR(power_status, S_IRUGO | S_IWUSR, get_component_power_status, | |
653 | set_component_power_status); | |
654 | static DEVICE_ATTR(type, S_IRUGO, get_component_type, NULL); | |
655 | static DEVICE_ATTR(slot, S_IRUGO, get_component_slot, NULL); | |
656 | ||
657 | static struct attribute *enclosure_component_attrs[] = { | |
658 | &dev_attr_fault.attr, | |
659 | &dev_attr_status.attr, | |
660 | &dev_attr_active.attr, | |
661 | &dev_attr_locate.attr, | |
662 | &dev_attr_power_status.attr, | |
663 | &dev_attr_type.attr, | |
664 | &dev_attr_slot.attr, | |
665 | NULL | |
666 | }; | |
667 | ATTRIBUTE_GROUPS(enclosure_component); | |
668 | ||
669 | static int __init enclosure_init(void) | |
670 | { | |
671 | return class_register(&enclosure_class); | |
672 | } | |
673 | ||
674 | static void __exit enclosure_exit(void) | |
675 | { | |
676 | class_unregister(&enclosure_class); | |
677 | } | |
678 | ||
679 | module_init(enclosure_init); | |
680 | module_exit(enclosure_exit); | |
681 | ||
682 | MODULE_AUTHOR("James Bottomley"); | |
683 | MODULE_DESCRIPTION("Enclosure Services"); | |
684 | MODULE_LICENSE("GPL v2"); |