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 put_device(). |
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(dev: &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(dev: &edev->edev); |
60 | mutex_unlock(lock: &container_list_lock); |
61 | return edev; |
62 | } |
63 | parent = parent->parent; |
64 | } |
65 | } |
66 | mutex_unlock(lock: &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(lock: &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(error: -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(dev: &edev->edev, name: "%s" , name); |
133 | err = device_register(dev: &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(new: &edev->node, head: &container_list); |
145 | mutex_unlock(lock: &container_list_lock); |
146 | |
147 | return edev; |
148 | |
149 | err: |
150 | put_device(dev: edev->edev.parent); |
151 | kfree(objp: edev); |
152 | return ERR_PTR(error: 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(entry: &edev->node); |
169 | mutex_unlock(lock: &container_list_lock); |
170 | |
171 | for (i = 0; i < edev->components; i++) |
172 | if (edev->component[i].number != -1) |
173 | device_unregister(dev: &edev->component[i].cdev); |
174 | |
175 | /* prevent any callbacks into service user */ |
176 | edev->cb = &enclosure_null_callbacks; |
177 | device_unregister(dev: &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(p: name, q: "enclosure_device:" ); |
187 | strcat(p: name, q: dev_name(dev: &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(kobj: &cdev->dev->kobj, name); |
202 | |
203 | if (cdev->cdev.kobj.sd) |
204 | sysfs_remove_link(kobj: &cdev->cdev.kobj, name: "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(kobj: &cdev->cdev.kobj, target: &cdev->dev->kobj, name: "device" ); |
213 | if (error) |
214 | return error; |
215 | |
216 | enclosure_link_name(cdev, name); |
217 | error = sysfs_create_link(kobj: &cdev->dev->kobj, target: &cdev->cdev.kobj, name); |
218 | if (error) |
219 | sysfs_remove_link(kobj: &cdev->cdev.kobj, name: "device" ); |
220 | |
221 | return error; |
222 | } |
223 | |
224 | static void enclosure_release(struct device *cdev) |
225 | { |
226 | struct enclosure_device *edev = to_enclosure_device(dev: cdev); |
227 | |
228 | put_device(dev: cdev->parent); |
229 | kfree(objp: 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(dev: cdev->dev); |
239 | } |
240 | put_device(dev: 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(dev: &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(error: -EINVAL); |
293 | |
294 | ecomp = &edev->component[number]; |
295 | |
296 | if (ecomp->number != -1) |
297 | return ERR_PTR(error: -EINVAL); |
298 | |
299 | ecomp->type = type; |
300 | ecomp->number = number; |
301 | cdev = &ecomp->cdev; |
302 | cdev->parent = get_device(dev: &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(buf: newname, COMPONENT_NAME_SIZE, |
311 | fmt: "%s" , name); |
312 | while (enclosure_component_find_by_name(edev, name: newname)) |
313 | snprintf(buf: newname, COMPONENT_NAME_SIZE, |
314 | fmt: "%s-%i" , name, i++); |
315 | dev_set_name(dev: cdev, name: "%s" , newname); |
316 | } else |
317 | dev_set_name(dev: cdev, name: "%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(dev: cdev); |
339 | if (err) { |
340 | ecomp->number = -1; |
341 | put_device(dev: 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(dev: cdev->dev); |
380 | } |
381 | cdev->dev = get_device(dev); |
382 | err = enclosure_add_links(cdev); |
383 | if (err) { |
384 | put_device(dev: 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(dev: cdev); |
428 | |
429 | return sysfs_emit(buf, fmt: "%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(dev: 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 | .dev_release = enclosure_release, |
455 | .dev_groups = enclosure_class_groups, |
456 | }; |
457 | |
458 | static const char *const enclosure_status[] = { |
459 | [ENCLOSURE_STATUS_UNSUPPORTED] = "unsupported" , |
460 | [ENCLOSURE_STATUS_OK] = "OK" , |
461 | [ENCLOSURE_STATUS_CRITICAL] = "critical" , |
462 | [ENCLOSURE_STATUS_NON_CRITICAL] = "non-critical" , |
463 | [ENCLOSURE_STATUS_UNRECOVERABLE] = "unrecoverable" , |
464 | [ENCLOSURE_STATUS_NOT_INSTALLED] = "not installed" , |
465 | [ENCLOSURE_STATUS_UNKNOWN] = "unknown" , |
466 | [ENCLOSURE_STATUS_UNAVAILABLE] = "unavailable" , |
467 | [ENCLOSURE_STATUS_MAX] = NULL, |
468 | }; |
469 | |
470 | static const char *const enclosure_type[] = { |
471 | [ENCLOSURE_COMPONENT_DEVICE] = "device" , |
472 | [ENCLOSURE_COMPONENT_ARRAY_DEVICE] = "array device" , |
473 | }; |
474 | |
475 | static ssize_t get_component_fault(struct device *cdev, |
476 | struct device_attribute *attr, char *buf) |
477 | { |
478 | struct enclosure_device *edev = to_enclosure_device(dev: cdev->parent); |
479 | struct enclosure_component *ecomp = to_enclosure_component(dev: cdev); |
480 | |
481 | if (edev->cb->get_fault) |
482 | edev->cb->get_fault(edev, ecomp); |
483 | return sysfs_emit(buf, fmt: "%d\n" , ecomp->fault); |
484 | } |
485 | |
486 | static ssize_t set_component_fault(struct device *cdev, |
487 | struct device_attribute *attr, |
488 | const char *buf, size_t count) |
489 | { |
490 | struct enclosure_device *edev = to_enclosure_device(dev: cdev->parent); |
491 | struct enclosure_component *ecomp = to_enclosure_component(dev: cdev); |
492 | int val = simple_strtoul(buf, NULL, 0); |
493 | |
494 | if (edev->cb->set_fault) |
495 | edev->cb->set_fault(edev, ecomp, val); |
496 | return count; |
497 | } |
498 | |
499 | static ssize_t get_component_status(struct device *cdev, |
500 | struct device_attribute *attr,char *buf) |
501 | { |
502 | struct enclosure_device *edev = to_enclosure_device(dev: cdev->parent); |
503 | struct enclosure_component *ecomp = to_enclosure_component(dev: cdev); |
504 | |
505 | if (edev->cb->get_status) |
506 | edev->cb->get_status(edev, ecomp); |
507 | return sysfs_emit(buf, fmt: "%s\n" , enclosure_status[ecomp->status]); |
508 | } |
509 | |
510 | static ssize_t set_component_status(struct device *cdev, |
511 | struct device_attribute *attr, |
512 | const char *buf, size_t count) |
513 | { |
514 | struct enclosure_device *edev = to_enclosure_device(dev: cdev->parent); |
515 | struct enclosure_component *ecomp = to_enclosure_component(dev: cdev); |
516 | int i; |
517 | |
518 | for (i = 0; enclosure_status[i]; i++) { |
519 | if (strncmp(buf, enclosure_status[i], |
520 | strlen(enclosure_status[i])) == 0 && |
521 | (buf[strlen(enclosure_status[i])] == '\n' || |
522 | buf[strlen(enclosure_status[i])] == '\0')) |
523 | break; |
524 | } |
525 | |
526 | if (enclosure_status[i] && edev->cb->set_status) { |
527 | edev->cb->set_status(edev, ecomp, i); |
528 | return count; |
529 | } else |
530 | return -EINVAL; |
531 | } |
532 | |
533 | static ssize_t get_component_active(struct device *cdev, |
534 | struct device_attribute *attr, char *buf) |
535 | { |
536 | struct enclosure_device *edev = to_enclosure_device(dev: cdev->parent); |
537 | struct enclosure_component *ecomp = to_enclosure_component(dev: cdev); |
538 | |
539 | if (edev->cb->get_active) |
540 | edev->cb->get_active(edev, ecomp); |
541 | return sysfs_emit(buf, fmt: "%d\n" , ecomp->active); |
542 | } |
543 | |
544 | static ssize_t set_component_active(struct device *cdev, |
545 | struct device_attribute *attr, |
546 | const char *buf, size_t count) |
547 | { |
548 | struct enclosure_device *edev = to_enclosure_device(dev: cdev->parent); |
549 | struct enclosure_component *ecomp = to_enclosure_component(dev: cdev); |
550 | int val = simple_strtoul(buf, NULL, 0); |
551 | |
552 | if (edev->cb->set_active) |
553 | edev->cb->set_active(edev, ecomp, val); |
554 | return count; |
555 | } |
556 | |
557 | static ssize_t get_component_locate(struct device *cdev, |
558 | struct device_attribute *attr, char *buf) |
559 | { |
560 | struct enclosure_device *edev = to_enclosure_device(dev: cdev->parent); |
561 | struct enclosure_component *ecomp = to_enclosure_component(dev: cdev); |
562 | |
563 | if (edev->cb->get_locate) |
564 | edev->cb->get_locate(edev, ecomp); |
565 | return sysfs_emit(buf, fmt: "%d\n" , ecomp->locate); |
566 | } |
567 | |
568 | static ssize_t set_component_locate(struct device *cdev, |
569 | struct device_attribute *attr, |
570 | const char *buf, size_t count) |
571 | { |
572 | struct enclosure_device *edev = to_enclosure_device(dev: cdev->parent); |
573 | struct enclosure_component *ecomp = to_enclosure_component(dev: cdev); |
574 | int val = simple_strtoul(buf, NULL, 0); |
575 | |
576 | if (edev->cb->set_locate) |
577 | edev->cb->set_locate(edev, ecomp, val); |
578 | return count; |
579 | } |
580 | |
581 | static ssize_t get_component_power_status(struct device *cdev, |
582 | struct device_attribute *attr, |
583 | char *buf) |
584 | { |
585 | struct enclosure_device *edev = to_enclosure_device(dev: cdev->parent); |
586 | struct enclosure_component *ecomp = to_enclosure_component(dev: cdev); |
587 | |
588 | if (edev->cb->get_power_status) |
589 | edev->cb->get_power_status(edev, ecomp); |
590 | |
591 | /* If still uninitialized, the callback failed or does not exist. */ |
592 | if (ecomp->power_status == -1) |
593 | return (edev->cb->get_power_status) ? -EIO : -ENOTTY; |
594 | |
595 | return sysfs_emit(buf, fmt: "%s\n" , ecomp->power_status ? "on" : "off" ); |
596 | } |
597 | |
598 | static ssize_t set_component_power_status(struct device *cdev, |
599 | struct device_attribute *attr, |
600 | const char *buf, size_t count) |
601 | { |
602 | struct enclosure_device *edev = to_enclosure_device(dev: cdev->parent); |
603 | struct enclosure_component *ecomp = to_enclosure_component(dev: cdev); |
604 | int val; |
605 | |
606 | if (strncmp(buf, "on" , 2) == 0 && |
607 | (buf[2] == '\n' || buf[2] == '\0')) |
608 | val = 1; |
609 | else if (strncmp(buf, "off" , 3) == 0 && |
610 | (buf[3] == '\n' || buf[3] == '\0')) |
611 | val = 0; |
612 | else |
613 | return -EINVAL; |
614 | |
615 | if (edev->cb->set_power_status) |
616 | edev->cb->set_power_status(edev, ecomp, val); |
617 | return count; |
618 | } |
619 | |
620 | static ssize_t get_component_type(struct device *cdev, |
621 | struct device_attribute *attr, char *buf) |
622 | { |
623 | struct enclosure_component *ecomp = to_enclosure_component(dev: cdev); |
624 | |
625 | return sysfs_emit(buf, fmt: "%s\n" , enclosure_type[ecomp->type]); |
626 | } |
627 | |
628 | static ssize_t get_component_slot(struct device *cdev, |
629 | struct device_attribute *attr, char *buf) |
630 | { |
631 | struct enclosure_component *ecomp = to_enclosure_component(dev: cdev); |
632 | int slot; |
633 | |
634 | /* if the enclosure does not override then use 'number' as a stand-in */ |
635 | if (ecomp->slot >= 0) |
636 | slot = ecomp->slot; |
637 | else |
638 | slot = ecomp->number; |
639 | |
640 | return sysfs_emit(buf, fmt: "%d\n" , slot); |
641 | } |
642 | |
643 | static DEVICE_ATTR(fault, S_IRUGO | S_IWUSR, get_component_fault, |
644 | set_component_fault); |
645 | static DEVICE_ATTR(status, S_IRUGO | S_IWUSR, get_component_status, |
646 | set_component_status); |
647 | static DEVICE_ATTR(active, S_IRUGO | S_IWUSR, get_component_active, |
648 | set_component_active); |
649 | static DEVICE_ATTR(locate, S_IRUGO | S_IWUSR, get_component_locate, |
650 | set_component_locate); |
651 | static DEVICE_ATTR(power_status, S_IRUGO | S_IWUSR, get_component_power_status, |
652 | set_component_power_status); |
653 | static DEVICE_ATTR(type, S_IRUGO, get_component_type, NULL); |
654 | static DEVICE_ATTR(slot, S_IRUGO, get_component_slot, NULL); |
655 | |
656 | static struct attribute *enclosure_component_attrs[] = { |
657 | &dev_attr_fault.attr, |
658 | &dev_attr_status.attr, |
659 | &dev_attr_active.attr, |
660 | &dev_attr_locate.attr, |
661 | &dev_attr_power_status.attr, |
662 | &dev_attr_type.attr, |
663 | &dev_attr_slot.attr, |
664 | NULL |
665 | }; |
666 | ATTRIBUTE_GROUPS(enclosure_component); |
667 | |
668 | static int __init enclosure_init(void) |
669 | { |
670 | return class_register(class: &enclosure_class); |
671 | } |
672 | |
673 | static void __exit enclosure_exit(void) |
674 | { |
675 | class_unregister(class: &enclosure_class); |
676 | } |
677 | |
678 | module_init(enclosure_init); |
679 | module_exit(enclosure_exit); |
680 | |
681 | MODULE_AUTHOR("James Bottomley" ); |
682 | MODULE_DESCRIPTION("Enclosure Services" ); |
683 | MODULE_LICENSE("GPL v2" ); |
684 | |