4 * Copyright (C) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
6 **-----------------------------------------------------------------------------
8 ** This program is free software; you can redistribute it and/or
9 ** modify it under the terms of the GNU General Public License
10 ** version 2 as published by the Free Software Foundation.
12 ** This program is distributed in the hope that it will be useful,
13 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
14 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 ** GNU General Public License for more details.
17 ** You should have received a copy of the GNU General Public License
18 ** along with this program; if not, write to the Free Software
19 ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 **-----------------------------------------------------------------------------
23 #include <linux/device.h>
24 #include <linux/enclosure.h>
25 #include <linux/err.h>
26 #include <linux/list.h>
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/mutex.h>
30 #include <linux/slab.h>
32 static LIST_HEAD(container_list);
33 static DEFINE_MUTEX(container_list_lock);
34 static struct class enclosure_class;
37 * enclosure_find - find an enclosure given a parent device
38 * @dev: the parent to match against
39 * @start: Optional enclosure device to start from (NULL if none)
41 * Looks through the list of registered enclosures to find all those
42 * with @dev as a parent. Returns NULL if no enclosure is
43 * found. @start can be used as a starting point to obtain multiple
44 * enclosures per parent (should begin with NULL and then be set to
45 * each returned enclosure device). Obtains a reference to the
46 * enclosure class device which must be released with device_put().
47 * If @start is not NULL, a reference must be taken on it which is
48 * released before returning (this allows a loop through all
49 * enclosures to exit with only the reference on the enclosure of
50 * interest held). Note that the @dev may correspond to the actual
51 * device housing the enclosure, in which case no iteration via @start
54 struct enclosure_device *enclosure_find(struct device *dev,
55 struct enclosure_device *start)
57 struct enclosure_device *edev;
59 mutex_lock(&container_list_lock);
60 edev = list_prepare_entry(start, &container_list, node);
62 put_device(&start->edev);
64 list_for_each_entry_continue(edev, &container_list, node) {
65 struct device *parent = edev->edev.parent;
66 /* parent might not be immediate, so iterate up to
67 * the root of the tree if necessary */
70 get_device(&edev->edev);
71 mutex_unlock(&container_list_lock);
74 parent = parent->parent;
77 mutex_unlock(&container_list_lock);
81 EXPORT_SYMBOL_GPL(enclosure_find);
84 * enclosure_for_each_device - calls a function for each enclosure
85 * @fn: the function to call
86 * @data: the data to pass to each call
88 * Loops over all the enclosures calling the function.
90 * Note, this function uses a mutex which will be held across calls to
91 * @fn, so it must have non atomic context, and @fn may (although it
92 * should not) sleep or otherwise cause the mutex to be held for
95 int enclosure_for_each_device(int (*fn)(struct enclosure_device *, void *),
99 struct enclosure_device *edev;
101 mutex_lock(&container_list_lock);
102 list_for_each_entry(edev, &container_list, node) {
103 error = fn(edev, data);
107 mutex_unlock(&container_list_lock);
111 EXPORT_SYMBOL_GPL(enclosure_for_each_device);
114 * enclosure_register - register device as an enclosure
116 * @dev: device containing the enclosure
117 * @components: number of components in the enclosure
119 * This sets up the device for being an enclosure. Note that @dev does
120 * not have to be a dedicated enclosure device. It may be some other type
121 * of device that additionally responds to enclosure services
123 struct enclosure_device *
124 enclosure_register(struct device *dev, const char *name, int components,
125 struct enclosure_component_callbacks *cb)
127 struct enclosure_device *edev =
128 kzalloc(sizeof(struct enclosure_device) +
129 sizeof(struct enclosure_component)*components,
136 return ERR_PTR(-ENOMEM);
138 edev->components = components;
140 edev->edev.class = &enclosure_class;
141 edev->edev.parent = get_device(dev);
143 dev_set_name(&edev->edev, "%s", name);
144 err = device_register(&edev->edev);
148 for (i = 0; i < components; i++)
149 edev->component[i].number = -1;
151 mutex_lock(&container_list_lock);
152 list_add_tail(&edev->node, &container_list);
153 mutex_unlock(&container_list_lock);
158 put_device(edev->edev.parent);
162 EXPORT_SYMBOL_GPL(enclosure_register);
164 static struct enclosure_component_callbacks enclosure_null_callbacks;
167 * enclosure_unregister - remove an enclosure
169 * @edev: the registered enclosure to remove;
171 void enclosure_unregister(struct enclosure_device *edev)
175 mutex_lock(&container_list_lock);
176 list_del(&edev->node);
177 mutex_unlock(&container_list_lock);
179 for (i = 0; i < edev->components; i++)
180 if (edev->component[i].number != -1)
181 device_unregister(&edev->component[i].cdev);
183 /* prevent any callbacks into service user */
184 edev->cb = &enclosure_null_callbacks;
185 device_unregister(&edev->edev);
187 EXPORT_SYMBOL_GPL(enclosure_unregister);
189 #define ENCLOSURE_NAME_SIZE 64
190 #define COMPONENT_NAME_SIZE 64
192 static void enclosure_link_name(struct enclosure_component *cdev, char *name)
194 strcpy(name, "enclosure_device:");
195 strcat(name, dev_name(&cdev->cdev));
198 static void enclosure_remove_links(struct enclosure_component *cdev)
200 char name[ENCLOSURE_NAME_SIZE];
203 * In odd circumstances, like multipath devices, something else may
204 * already have removed the links, so check for this condition first.
206 if (!cdev->dev->kobj.sd)
209 enclosure_link_name(cdev, name);
210 sysfs_remove_link(&cdev->dev->kobj, name);
211 sysfs_remove_link(&cdev->cdev.kobj, "device");
214 static int enclosure_add_links(struct enclosure_component *cdev)
217 char name[ENCLOSURE_NAME_SIZE];
219 error = sysfs_create_link(&cdev->cdev.kobj, &cdev->dev->kobj, "device");
223 enclosure_link_name(cdev, name);
224 error = sysfs_create_link(&cdev->dev->kobj, &cdev->cdev.kobj, name);
226 sysfs_remove_link(&cdev->cdev.kobj, "device");
231 static void enclosure_release(struct device *cdev)
233 struct enclosure_device *edev = to_enclosure_device(cdev);
235 put_device(cdev->parent);
239 static void enclosure_component_release(struct device *dev)
241 struct enclosure_component *cdev = to_enclosure_component(dev);
244 enclosure_remove_links(cdev);
245 put_device(cdev->dev);
247 put_device(dev->parent);
250 static struct enclosure_component *
251 enclosure_component_find_by_name(struct enclosure_device *edev,
256 struct enclosure_component *ecomp;
258 if (!edev || !name || !name[0])
261 for (i = 0; i < edev->components; i++) {
262 ecomp = &edev->component[i];
263 cname = dev_name(&ecomp->cdev);
264 if (ecomp->number != -1 &&
266 !strcmp(cname, name))
273 static const struct attribute_group *enclosure_component_groups[];
276 * enclosure_component_alloc - prepare a new enclosure component
277 * @edev: the enclosure to add the component
278 * @num: the device number
279 * @type: the type of component being added
280 * @name: an optional name to appear in sysfs (leave NULL if none)
282 * The name is optional for enclosures that give their components a unique
283 * name. If not, leave the field NULL and a name will be assigned.
285 * Returns a pointer to the enclosure component or an error.
287 struct enclosure_component *
288 enclosure_component_alloc(struct enclosure_device *edev,
290 enum enclosure_component_type type,
293 struct enclosure_component *ecomp;
296 char newname[COMPONENT_NAME_SIZE];
298 if (number >= edev->components)
299 return ERR_PTR(-EINVAL);
301 ecomp = &edev->component[number];
303 if (ecomp->number != -1)
304 return ERR_PTR(-EINVAL);
307 ecomp->number = number;
309 cdev->parent = get_device(&edev->edev);
311 if (name && name[0]) {
312 /* Some hardware (e.g. enclosure in RX300 S6) has components
313 * with non unique names. Registering duplicates in sysfs
314 * will lead to warnings during bootup. So make the names
315 * unique by appending consecutive numbers -1, -2, ... */
317 snprintf(newname, COMPONENT_NAME_SIZE,
319 while (enclosure_component_find_by_name(edev, newname))
320 snprintf(newname, COMPONENT_NAME_SIZE,
322 dev_set_name(cdev, "%s", newname);
324 dev_set_name(cdev, "%u", number);
326 cdev->release = enclosure_component_release;
327 cdev->groups = enclosure_component_groups;
331 EXPORT_SYMBOL_GPL(enclosure_component_alloc);
334 * enclosure_component_register - publishes an initialized enclosure component
335 * @ecomp: component to add
337 * Returns 0 on successful registration, releases the component otherwise
339 int enclosure_component_register(struct enclosure_component *ecomp)
345 err = device_register(cdev);
354 EXPORT_SYMBOL_GPL(enclosure_component_register);
357 * enclosure_add_device - add a device as being part of an enclosure
358 * @edev: the enclosure device being added to.
359 * @num: the number of the component
360 * @dev: the device being added
362 * Declares a real device to reside in slot (or identifier) @num of an
363 * enclosure. This will cause the relevant sysfs links to appear.
364 * This function may also be used to change a device associated with
365 * an enclosure without having to call enclosure_remove_device() in
368 * Returns zero on success or an error.
370 int enclosure_add_device(struct enclosure_device *edev, int component,
373 struct enclosure_component *cdev;
375 if (!edev || component >= edev->components)
378 cdev = &edev->component[component];
380 if (cdev->dev == dev)
384 enclosure_remove_links(cdev);
386 put_device(cdev->dev);
387 cdev->dev = get_device(dev);
388 return enclosure_add_links(cdev);
390 EXPORT_SYMBOL_GPL(enclosure_add_device);
393 * enclosure_remove_device - remove a device from an enclosure
394 * @edev: the enclosure device
395 * @num: the number of the component to remove
397 * Returns zero on success or an error.
400 int enclosure_remove_device(struct enclosure_device *edev, struct device *dev)
402 struct enclosure_component *cdev;
408 for (i = 0; i < edev->components; i++) {
409 cdev = &edev->component[i];
410 if (cdev->dev == dev) {
411 enclosure_remove_links(cdev);
412 device_del(&cdev->cdev);
415 return device_add(&cdev->cdev);
420 EXPORT_SYMBOL_GPL(enclosure_remove_device);
426 static ssize_t components_show(struct device *cdev,
427 struct device_attribute *attr, char *buf)
429 struct enclosure_device *edev = to_enclosure_device(cdev);
431 return snprintf(buf, 40, "%d\n", edev->components);
433 static DEVICE_ATTR_RO(components);
435 static ssize_t id_show(struct device *cdev,
436 struct device_attribute *attr,
439 struct enclosure_device *edev = to_enclosure_device(cdev);
441 if (edev->cb->show_id)
442 return edev->cb->show_id(edev, buf);
445 static DEVICE_ATTR_RO(id);
447 static struct attribute *enclosure_class_attrs[] = {
448 &dev_attr_components.attr,
452 ATTRIBUTE_GROUPS(enclosure_class);
454 static struct class enclosure_class = {
456 .owner = THIS_MODULE,
457 .dev_release = enclosure_release,
458 .dev_groups = enclosure_class_groups,
461 static const char *const enclosure_status [] = {
462 [ENCLOSURE_STATUS_UNSUPPORTED] = "unsupported",
463 [ENCLOSURE_STATUS_OK] = "OK",
464 [ENCLOSURE_STATUS_CRITICAL] = "critical",
465 [ENCLOSURE_STATUS_NON_CRITICAL] = "non-critical",
466 [ENCLOSURE_STATUS_UNRECOVERABLE] = "unrecoverable",
467 [ENCLOSURE_STATUS_NOT_INSTALLED] = "not installed",
468 [ENCLOSURE_STATUS_UNKNOWN] = "unknown",
469 [ENCLOSURE_STATUS_UNAVAILABLE] = "unavailable",
470 [ENCLOSURE_STATUS_MAX] = NULL,
473 static const char *const enclosure_type [] = {
474 [ENCLOSURE_COMPONENT_DEVICE] = "device",
475 [ENCLOSURE_COMPONENT_ARRAY_DEVICE] = "array device",
478 static ssize_t get_component_fault(struct device *cdev,
479 struct device_attribute *attr, char *buf)
481 struct enclosure_device *edev = to_enclosure_device(cdev->parent);
482 struct enclosure_component *ecomp = to_enclosure_component(cdev);
484 if (edev->cb->get_fault)
485 edev->cb->get_fault(edev, ecomp);
486 return snprintf(buf, 40, "%d\n", ecomp->fault);
489 static ssize_t set_component_fault(struct device *cdev,
490 struct device_attribute *attr,
491 const char *buf, size_t count)
493 struct enclosure_device *edev = to_enclosure_device(cdev->parent);
494 struct enclosure_component *ecomp = to_enclosure_component(cdev);
495 int val = simple_strtoul(buf, NULL, 0);
497 if (edev->cb->set_fault)
498 edev->cb->set_fault(edev, ecomp, val);
502 static ssize_t get_component_status(struct device *cdev,
503 struct device_attribute *attr,char *buf)
505 struct enclosure_device *edev = to_enclosure_device(cdev->parent);
506 struct enclosure_component *ecomp = to_enclosure_component(cdev);
508 if (edev->cb->get_status)
509 edev->cb->get_status(edev, ecomp);
510 return snprintf(buf, 40, "%s\n", enclosure_status[ecomp->status]);
513 static ssize_t set_component_status(struct device *cdev,
514 struct device_attribute *attr,
515 const char *buf, size_t count)
517 struct enclosure_device *edev = to_enclosure_device(cdev->parent);
518 struct enclosure_component *ecomp = to_enclosure_component(cdev);
521 for (i = 0; enclosure_status[i]; i++) {
522 if (strncmp(buf, enclosure_status[i],
523 strlen(enclosure_status[i])) == 0 &&
524 (buf[strlen(enclosure_status[i])] == '\n' ||
525 buf[strlen(enclosure_status[i])] == '\0'))
529 if (enclosure_status[i] && edev->cb->set_status) {
530 edev->cb->set_status(edev, ecomp, i);
536 static ssize_t get_component_active(struct device *cdev,
537 struct device_attribute *attr, char *buf)
539 struct enclosure_device *edev = to_enclosure_device(cdev->parent);
540 struct enclosure_component *ecomp = to_enclosure_component(cdev);
542 if (edev->cb->get_active)
543 edev->cb->get_active(edev, ecomp);
544 return snprintf(buf, 40, "%d\n", ecomp->active);
547 static ssize_t set_component_active(struct device *cdev,
548 struct device_attribute *attr,
549 const char *buf, size_t count)
551 struct enclosure_device *edev = to_enclosure_device(cdev->parent);
552 struct enclosure_component *ecomp = to_enclosure_component(cdev);
553 int val = simple_strtoul(buf, NULL, 0);
555 if (edev->cb->set_active)
556 edev->cb->set_active(edev, ecomp, val);
560 static ssize_t get_component_locate(struct device *cdev,
561 struct device_attribute *attr, char *buf)
563 struct enclosure_device *edev = to_enclosure_device(cdev->parent);
564 struct enclosure_component *ecomp = to_enclosure_component(cdev);
566 if (edev->cb->get_locate)
567 edev->cb->get_locate(edev, ecomp);
568 return snprintf(buf, 40, "%d\n", ecomp->locate);
571 static ssize_t set_component_locate(struct device *cdev,
572 struct device_attribute *attr,
573 const char *buf, size_t count)
575 struct enclosure_device *edev = to_enclosure_device(cdev->parent);
576 struct enclosure_component *ecomp = to_enclosure_component(cdev);
577 int val = simple_strtoul(buf, NULL, 0);
579 if (edev->cb->set_locate)
580 edev->cb->set_locate(edev, ecomp, val);
584 static ssize_t get_component_type(struct device *cdev,
585 struct device_attribute *attr, char *buf)
587 struct enclosure_component *ecomp = to_enclosure_component(cdev);
589 return snprintf(buf, 40, "%s\n", enclosure_type[ecomp->type]);
593 static DEVICE_ATTR(fault, S_IRUGO | S_IWUSR, get_component_fault,
594 set_component_fault);
595 static DEVICE_ATTR(status, S_IRUGO | S_IWUSR, get_component_status,
596 set_component_status);
597 static DEVICE_ATTR(active, S_IRUGO | S_IWUSR, get_component_active,
598 set_component_active);
599 static DEVICE_ATTR(locate, S_IRUGO | S_IWUSR, get_component_locate,
600 set_component_locate);
601 static DEVICE_ATTR(type, S_IRUGO, get_component_type, NULL);
603 static struct attribute *enclosure_component_attrs[] = {
604 &dev_attr_fault.attr,
605 &dev_attr_status.attr,
606 &dev_attr_active.attr,
607 &dev_attr_locate.attr,
611 ATTRIBUTE_GROUPS(enclosure_component);
613 static int __init enclosure_init(void)
617 err = class_register(&enclosure_class);
624 static void __exit enclosure_exit(void)
626 class_unregister(&enclosure_class);
629 module_init(enclosure_init);
630 module_exit(enclosure_exit);
632 MODULE_AUTHOR("James Bottomley");
633 MODULE_DESCRIPTION("Enclosure Services");
634 MODULE_LICENSE("GPL v2");