// SPDX-License-Identifier: GPL-2.0-only/* * Enclosure Services * * Copyright (C) 2008 James Bottomley <James.Bottomley@HansenPartnership.com> ***-----------------------------------------------------------------------------******-----------------------------------------------------------------------------*/#include <linux/device.h>#include <linux/enclosure.h>#include <linux/err.h>#include <linux/list.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/mutex.h>#include <linux/slab.h>#include <linux/string_choices.h> static LIST_HEAD(container_list);static DEFINE_MUTEX(container_list_lock);static struct class enclosure_class; /** * enclosure_find - find an enclosure given a parent device * @dev: the parent to match against * @start: Optional enclosure device to start from (NULL if none) * * Looks through the list of registered enclosures to find all those * with @dev as a parent. Returns NULL if no enclosure is * found. @start can be used as a starting point to obtain multiple * enclosures per parent (should begin with NULL and then be set to * each returned enclosure device). Obtains a reference to the * enclosure class device which must be released with put_device(). * If @start is not NULL, a reference must be taken on it which is * released before returning (this allows a loop through all * enclosures to exit with only the reference on the enclosure of * interest held). Note that the @dev may correspond to the actual * device housing the enclosure, in which case no iteration via @start * is required. */struct enclosure_device *enclosure_find(struct device *dev, struct enclosure_device *start){ struct enclosure_device *edev; mutex_lock(&container_list_lock); edev = list_prepare_entry(start, &container_list, node); if (start) put_device(&start->edev); list_for_each_entry_continue(edev, &container_list, node) { struct device *parent = edev->edev.parent; /* parent might not be immediate, so iterate up to * the root of the tree if necessary */ while (parent) { if (parent == dev) { get_device(&edev->edev); mutex_unlock(&container_list_lock); return edev; } parent = parent->parent; } } mutex_unlock(&container_list_lock); return NULL;}EXPORT_SYMBOL_GPL(enclosure_find); /** * enclosure_for_each_device - calls a function for each enclosure * @fn: the function to call * @data: the data to pass to each call * * Loops over all the enclosures calling the function. * * Note, this function uses a mutex which will be held across calls to * @fn, so it must have non atomic context, and @fn may (although it * should not) sleep or otherwise cause the mutex to be held for * indefinite periods */int enclosure_for_each_device(int (*fn)(struct enclosure_device *, void *), void *data){ int error = 0; struct enclosure_device *edev; mutex_lock(&container_list_lock); list_for_each_entry(edev, &container_list, node) { error = fn(edev, data); if (error) break; } mutex_unlock(&container_list_lock); return error;}EXPORT_SYMBOL_GPL(enclosure_for_each_device); /** * enclosure_register - register device as an enclosure * * @dev: device containing the enclosure * @name: chosen device name * @components: number of components in the enclosure * @cb: platform call-backs * * This sets up the device for being an enclosure. Note that @dev does * not have to be a dedicated enclosure device. It may be some other type * of device that additionally responds to enclosure services */struct enclosure_device *enclosure_register(struct device *dev, const char *name, int components, struct enclosure_component_callbacks *cb){ struct enclosure_device *edev = kzalloc_flex(*edev, component, components); int err, i; BUG_ON(!cb); if (!edev) return ERR_PTR(-ENOMEM); edev->components = components; edev->edev.class = &enclosure_class; edev->edev.parent = get_device(dev); edev->cb = cb; dev_set_name(&edev->edev, "%s", name); err = device_register(&edev->edev); if (err) goto err; for (i = 0; i < components; i++) { edev->component[i].number = -1; edev->component[i].slot = -1; edev->component[i].power_status = -1; } mutex_lock(&container_list_lock); list_add_tail(&edev->node, &container_list); mutex_unlock(&container_list_lock); return edev; err: put_device(edev->edev.parent); kfree(edev); return ERR_PTR(err);}EXPORT_SYMBOL_GPL(enclosure_register); static struct enclosure_component_callbacks enclosure_null_callbacks; /** * enclosure_unregister - remove an enclosure * * @edev: the registered enclosure to remove; */void enclosure_unregister(struct enclosure_device *edev){ int i; mutex_lock(&container_list_lock); list_del(&edev->node); mutex_unlock(&container_list_lock); for (i = 0; i < edev->components; i++) if (edev->component[i].number != -1) device_unregister(&edev->component[i].cdev); /* prevent any callbacks into service user */ edev->cb = &enclosure_null_callbacks; device_unregister(&edev->edev);}EXPORT_SYMBOL_GPL(enclosure_unregister); #define ENCLOSURE_NAME_SIZE 64#define COMPONENT_NAME_SIZE 64 static void enclosure_link_name(struct enclosure_component *cdev, char *name){ snprintf(name, ENCLOSURE_NAME_SIZE, "enclosure_device:%s", dev_name(&cdev->cdev));} static void enclosure_remove_links(struct enclosure_component *cdev){ char name[ENCLOSURE_NAME_SIZE]; enclosure_link_name(cdev, name); /* * In odd circumstances, like multipath devices, something else may * already have removed the links, so check for this condition first. */ if (cdev->dev->kobj.sd) sysfs_remove_link(&cdev->dev->kobj, name); if (cdev->cdev.kobj.sd) sysfs_remove_link(&cdev->cdev.kobj, "device");} static int enclosure_add_links(struct enclosure_component *cdev){ int error; char name[ENCLOSURE_NAME_SIZE]; error = sysfs_create_link(&cdev->cdev.kobj, &cdev->dev->kobj, "device"); if (error) return error; enclosure_link_name(cdev, name); error = sysfs_create_link(&cdev->dev->kobj, &cdev->cdev.kobj, name); if (error) sysfs_remove_link(&cdev->cdev.kobj, "device"); return error;} static void enclosure_release(struct device *cdev){ struct enclosure_device *edev = to_enclosure_device(cdev); put_device(cdev->parent); kfree(edev);} static void enclosure_component_release(struct device *dev){ struct enclosure_component *cdev = to_enclosure_component(dev); if (cdev->dev) { enclosure_remove_links(cdev); put_device(cdev->dev); } put_device(dev->parent);} static struct enclosure_component *enclosure_component_find_by_name(struct enclosure_device *edev, const char *name){ int i; const char *cname; struct enclosure_component *ecomp; if (!edev || !name || !name[0]) return NULL; for (i = 0; i < edev->components; i++) { ecomp = &edev->component[i]; cname = dev_name(&ecomp->cdev); if (ecomp->number != -1 && cname && cname[0] && !strcmp(cname, name)) return ecomp; } return NULL;} static const struct attribute_group *enclosure_component_groups[]; /** * enclosure_component_alloc - prepare a new enclosure component * @edev: the enclosure to add the component * @number: the device number * @type: the type of component being added * @name: an optional name to appear in sysfs (leave NULL if none) * * The name is optional for enclosures that give their components a unique * name. If not, leave the field NULL and a name will be assigned. * * Returns a pointer to the enclosure component or an error. */struct enclosure_component *enclosure_component_alloc(struct enclosure_device *edev, unsigned int number, enum enclosure_component_type type, const char *name){ struct enclosure_component *ecomp; struct device *cdev; int i; char newname[COMPONENT_NAME_SIZE]; if (number >= edev->components) return ERR_PTR(-EINVAL); ecomp = &edev->component[number]; if (ecomp->number != -1) return ERR_PTR(-EINVAL); ecomp->type = type; ecomp->number = number; cdev = &ecomp->cdev; cdev->parent = get_device(&edev->edev); if (name && name[0]) { /* Some hardware (e.g. enclosure in RX300 S6) has components * with non unique names. Registering duplicates in sysfs * will lead to warnings during bootup. So make the names * unique by appending consecutive numbers -1, -2, ... */ i = 1; snprintf(newname, COMPONENT_NAME_SIZE, "%s", name); while (enclosure_component_find_by_name(edev, newname)) snprintf(newname, COMPONENT_NAME_SIZE, "%s-%i", name, i++); dev_set_name(cdev, "%s", newname); } else dev_set_name(cdev, "%u", number); cdev->release = enclosure_component_release; cdev->groups = enclosure_component_groups; return ecomp;}EXPORT_SYMBOL_GPL(enclosure_component_alloc); /** * enclosure_component_register - publishes an initialized enclosure component * @ecomp: component to add * * Returns 0 on successful registration, releases the component otherwise */int enclosure_component_register(struct enclosure_component *ecomp){ struct device *cdev; int err; cdev = &ecomp->cdev; err = device_register(cdev); if (err) { ecomp->number = -1; put_device(cdev); return err; } return 0;}EXPORT_SYMBOL_GPL(enclosure_component_register); /** * enclosure_add_device - add a device as being part of an enclosure * @edev: the enclosure device being added to. * @component: the number of the component * @dev: the device being added * * Declares a real device to reside in slot (or identifier) @num of an * enclosure. This will cause the relevant sysfs links to appear. * This function may also be used to change a device associated with * an enclosure without having to call enclosure_remove_device() in * between. * * Returns zero on success or an error. */int enclosure_add_device(struct enclosure_device *edev, int component, struct device *dev){ struct enclosure_component *cdev; int err; if (!edev || component >= edev->components) return -EINVAL; cdev = &edev->component[component]; if (cdev->dev == dev) return -EEXIST; if (cdev->dev) { enclosure_remove_links(cdev); put_device(cdev->dev); } cdev->dev = get_device(dev); err = enclosure_add_links(cdev); if (err) { put_device(cdev->dev); cdev->dev = NULL; } return err;}EXPORT_SYMBOL_GPL(enclosure_add_device); /** * enclosure_remove_device - remove a device from an enclosure * @edev: the enclosure device * @dev: device to remove/put * * Returns zero on success or an error. * */int enclosure_remove_device(struct enclosure_device *edev, struct device *dev){ struct enclosure_component *cdev; int i; if (!edev || !dev) return -EINVAL; for (i = 0; i < edev->components; i++) { cdev = &edev->component[i]; if (cdev->dev == dev) { enclosure_remove_links(cdev); put_device(dev); cdev->dev = NULL; return 0; } } return -ENODEV;}EXPORT_SYMBOL_GPL(enclosure_remove_device); /* * sysfs pieces below */ static ssize_t components_show(struct device *cdev, struct device_attribute *attr, char *buf){ struct enclosure_device *edev = to_enclosure_device(cdev); return sysfs_emit(buf, "%d\n", edev->components);}static DEVICE_ATTR_RO(components); static ssize_t id_show(struct device *cdev, struct device_attribute *attr, char *buf){ struct enclosure_device *edev = to_enclosure_device(cdev); if (edev->cb->show_id) return edev->cb->show_id(edev, buf); return -EINVAL;}static DEVICE_ATTR_RO(id); static struct attribute *enclosure_class_attrs[] = { &dev_attr_components.attr, &dev_attr_id.attr, NULL,};ATTRIBUTE_GROUPS(enclosure_class); static struct class enclosure_class = { .name = "enclosure", .dev_release = enclosure_release, .dev_groups = enclosure_class_groups,}; static const char *const enclosure_status[] = { [ENCLOSURE_STATUS_UNSUPPORTED] = "unsupported", [ENCLOSURE_STATUS_OK] = "OK", [ENCLOSURE_STATUS_CRITICAL] = "critical", [ENCLOSURE_STATUS_NON_CRITICAL] = "non-critical", [ENCLOSURE_STATUS_UNRECOVERABLE] = "unrecoverable", [ENCLOSURE_STATUS_NOT_INSTALLED] = "not installed", [ENCLOSURE_STATUS_UNKNOWN] = "unknown", [ENCLOSURE_STATUS_UNAVAILABLE] = "unavailable", [ENCLOSURE_STATUS_MAX] = NULL,}; static const char *const enclosure_type[] = { [ENCLOSURE_COMPONENT_DEVICE] = "device", [ENCLOSURE_COMPONENT_ARRAY_DEVICE] = "array device",}; static ssize_t get_component_fault(struct device *cdev, struct device_attribute *attr, char *buf){ struct enclosure_device *edev = to_enclosure_device(cdev->parent); struct enclosure_component *ecomp = to_enclosure_component(cdev); if (edev->cb->get_fault) edev->cb->get_fault(edev, ecomp); return sysfs_emit(buf, "%d\n", ecomp->fault);} static ssize_t set_component_fault(struct device *cdev, struct device_attribute *attr, const char *buf, size_t count){ struct enclosure_device *edev = to_enclosure_device(cdev->parent); struct enclosure_component *ecomp = to_enclosure_component(cdev); int val = simple_strtoul(buf, NULL, 0); if (edev->cb->set_fault) edev->cb->set_fault(edev, ecomp, val); return count;} static ssize_t get_component_status(struct device *cdev,Lines 1–500 of 684. 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// SPDX-License-Identifier: GPL-2.0-only /* * Enclosure Services * * Copyright (C) 2008 James Bottomley <James.Bottomley@HansenPartnership.com> * **----------------------------------------------------------------------------- ** ** **----------------------------------------------------------------------------- */ #include <linux/device.h> #include <linux/enclosure.h> #include <linux/err.h> #include <linux/list.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/slab.h> #include <linux/string_choices.h> static LIST_HEAD(container_list); static DEFINE_MUTEX(container_list_lock); static struct class enclosure_class; /** * enclosure_find - find an enclosure given a parent device * @dev: the parent to match against * @start: Optional enclosure device to start from (NULL if none) * * Looks through the list of registered enclosures to find all those * with @dev as a parent. Returns NULL if no enclosure is * found. @start can be used as a starting point to obtain multiple * enclosures per parent (should begin with NULL and then be set to * each returned enclosure device). Obtains a reference to the * enclosure class device which must be released with put_device(). * If @start is not NULL, a reference must be taken on it which is * released before returning (this allows a loop through all * enclosures to exit with only the reference on the enclosure of * interest held). Note that the @dev may correspond to the actual * device housing the enclosure, in which case no iteration via @start * is required. */ struct enclosure_device *enclosure_find(struct device *dev, struct enclosure_device *start) { struct enclosure_device *edev; mutex_lock(&container_list_lock); edev = list_prepare_entry(start, &container_list, node); if (start) put_device(&start->edev); list_for_each_entry_continue(edev, &container_list, node) { struct device *parent = edev->edev.parent; /* parent might not be immediate, so iterate up to * the root of the tree if necessary */ while (parent) { if (parent == dev) { get_device(&edev->edev); mutex_unlock(&container_list_lock); return edev; } parent = parent->parent; } } mutex_unlock(&container_list_lock); return NULL; } EXPORT_SYMBOL_GPL(enclosure_find); /** * enclosure_for_each_device - calls a function for each enclosure * @fn: the function to call * @data: the data to pass to each call * * Loops over all the enclosures calling the function. * * Note, this function uses a mutex which will be held across calls to * @fn, so it must have non atomic context, and @fn may (although it * should not) sleep or otherwise cause the mutex to be held for * indefinite periods */ int enclosure_for_each_device(int (*fn)(struct enclosure_device *, void *), void *data) { int error = 0; struct enclosure_device *edev; mutex_lock(&container_list_lock); list_for_each_entry(edev, &container_list, node) { error = fn(edev, data); if (error) break; } mutex_unlock(&container_list_lock); return error; } EXPORT_SYMBOL_GPL(enclosure_for_each_device); /** * enclosure_register - register device as an enclosure * * @dev: device containing the enclosure * @name: chosen device name * @components: number of components in the enclosure * @cb: platform call-backs * * This sets up the device for being an enclosure. Note that @dev does * not have to be a dedicated enclosure device. It may be some other type * of device that additionally responds to enclosure services */ struct enclosure_device * enclosure_register(struct device *dev, const char *name, int components, struct enclosure_component_callbacks *cb) { struct enclosure_device *edev = kzalloc_flex(*edev, component, components); int err, i; BUG_ON(!cb); if (!edev) return ERR_PTR(-ENOMEM); edev->components = components; edev->edev.class = &enclosure_class; edev->edev.parent = get_device(dev); edev->cb = cb; dev_set_name(&edev->edev, "%s", name); err = device_register(&edev->edev); if (err) goto err; for (i = 0; i < components; i++) { edev->component[i].number = -1; edev->component[i].slot = -1; edev->component[i].power_status = -1; } mutex_lock(&container_list_lock); list_add_tail(&edev->node, &container_list); mutex_unlock(&container_list_lock); return edev; err: put_device(edev->edev.parent); kfree(edev); return ERR_PTR(err); } EXPORT_SYMBOL_GPL(enclosure_register); static struct enclosure_component_callbacks enclosure_null_callbacks; /** * enclosure_unregister - remove an enclosure * * @edev: the registered enclosure to remove; */ void enclosure_unregister(struct enclosure_device *edev) { int i; mutex_lock(&container_list_lock); list_del(&edev->node); mutex_unlock(&container_list_lock); for (i = 0; i < edev->components; i++) if (edev->component[i].number != -1) device_unregister(&edev->component[i].cdev); /* prevent any callbacks into service user */ edev->cb = &enclosure_null_callbacks; device_unregister(&edev->edev); } EXPORT_SYMBOL_GPL(enclosure_unregister); #define ENCLOSURE_NAME_SIZE 64 #define COMPONENT_NAME_SIZE 64 static void enclosure_link_name(struct enclosure_component *cdev, char *name) { snprintf(name, ENCLOSURE_NAME_SIZE, "enclosure_device:%s", dev_name(&cdev->cdev)); } static void enclosure_remove_links(struct enclosure_component *cdev) { char name[ENCLOSURE_NAME_SIZE]; enclosure_link_name(cdev, name); /* * In odd circumstances, like multipath devices, something else may * already have removed the links, so check for this condition first. */ if (cdev->dev->kobj.sd) sysfs_remove_link(&cdev->dev->kobj, name); if (cdev->cdev.kobj.sd) sysfs_remove_link(&cdev->cdev.kobj, "device"); } static int enclosure_add_links(struct enclosure_component *cdev) { int error; char name[ENCLOSURE_NAME_SIZE]; error = sysfs_create_link(&cdev->cdev.kobj, &cdev->dev->kobj, "device"); if (error) return error; enclosure_link_name(cdev, name); error = sysfs_create_link(&cdev->dev->kobj, &cdev->cdev.kobj, name); if (error) sysfs_remove_link(&cdev->cdev.kobj, "device"); return error; } static void enclosure_release(struct device *cdev) { struct enclosure_device *edev = to_enclosure_device(cdev); put_device(cdev->parent); kfree(edev); } static void enclosure_component_release(struct device *dev) { struct enclosure_component *cdev = to_enclosure_component(dev); if (cdev->dev) { enclosure_remove_links(cdev); put_device(cdev->dev); } put_device(dev->parent); } static struct enclosure_component * enclosure_component_find_by_name(struct enclosure_device *edev, const char *name) { int i; const char *cname; struct enclosure_component *ecomp; if (!edev || !name || !name[0]) return NULL; for (i = 0; i < edev->components; i++) { ecomp = &edev->component[i]; cname = dev_name(&ecomp->cdev); if (ecomp->number != -1 && cname && cname[0] && !strcmp(cname, name)) return ecomp; } return NULL; } static const struct attribute_group *enclosure_component_groups[]; /** * enclosure_component_alloc - prepare a new enclosure component * @edev: the enclosure to add the component * @number: the device number * @type: the type of component being added * @name: an optional name to appear in sysfs (leave NULL if none) * * The name is optional for enclosures that give their components a unique * name. If not, leave the field NULL and a name will be assigned. * * Returns a pointer to the enclosure component or an error. */ struct enclosure_component * enclosure_component_alloc(struct enclosure_device *edev, unsigned int number, enum enclosure_component_type type, const char *name) { struct enclosure_component *ecomp; struct device *cdev; int i; char newname[COMPONENT_NAME_SIZE]; if (number >= edev->components) return ERR_PTR(-EINVAL); ecomp = &edev->component[number]; if (ecomp->number != -1) return ERR_PTR(-EINVAL); ecomp->type = type; ecomp->number = number; cdev = &ecomp->cdev; cdev->parent = get_device(&edev->edev); if (name && name[0]) { /* Some hardware (e.g. enclosure in RX300 S6) has components * with non unique names. Registering duplicates in sysfs * will lead to warnings during bootup. So make the names * unique by appending consecutive numbers -1, -2, ... */ i = 1; snprintf(newname, COMPONENT_NAME_SIZE, "%s", name); while (enclosure_component_find_by_name(edev, newname)) snprintf(newname, COMPONENT_NAME_SIZE, "%s-%i", name, i++); dev_set_name(cdev, "%s", newname); } else dev_set_name(cdev, "%u", number); cdev->release = enclosure_component_release; cdev->groups = enclosure_component_groups; return ecomp; } EXPORT_SYMBOL_GPL(enclosure_component_alloc); /** * enclosure_component_register - publishes an initialized enclosure component * @ecomp: component to add * * Returns 0 on successful registration, releases the component otherwise */ int enclosure_component_register(struct enclosure_component *ecomp) { struct device *cdev; int err; cdev = &ecomp->cdev; err = device_register(cdev); if (err) { ecomp->number = -1; put_device(cdev); return err; } return 0; } EXPORT_SYMBOL_GPL(enclosure_component_register); /** * enclosure_add_device - add a device as being part of an enclosure * @edev: the enclosure device being added to. * @component: the number of the component * @dev: the device being added * * Declares a real device to reside in slot (or identifier) @num of an * enclosure. This will cause the relevant sysfs links to appear. * This function may also be used to change a device associated with * an enclosure without having to call enclosure_remove_device() in * between. * * Returns zero on success or an error. */ int enclosure_add_device(struct enclosure_device *edev, int component, struct device *dev) { struct enclosure_component *cdev; int err; if (!edev || component >= edev->components) return -EINVAL; cdev = &edev->component[component]; if (cdev->dev == dev) return -EEXIST; if (cdev->dev) { enclosure_remove_links(cdev); put_device(cdev->dev); } cdev->dev = get_device(dev); err = enclosure_add_links(cdev); if (err) { put_device(cdev->dev); cdev->dev = NULL; } return err; } EXPORT_SYMBOL_GPL(enclosure_add_device); /** * enclosure_remove_device - remove a device from an enclosure * @edev: the enclosure device * @dev: device to remove/put * * Returns zero on success or an error. * */ int enclosure_remove_device(struct enclosure_device *edev, struct device *dev) { struct enclosure_component *cdev; int i; if (!edev || !dev) return -EINVAL; for (i = 0; i < edev->components; i++) { cdev = &edev->component[i]; if (cdev->dev == dev) { enclosure_remove_links(cdev); put_device(dev); cdev->dev = NULL; return 0; } } return -ENODEV; } EXPORT_SYMBOL_GPL(enclosure_remove_device); /* * sysfs pieces below */ static ssize_t components_show(struct device *cdev, struct device_attribute *attr, char *buf) { struct enclosure_device *edev = to_enclosure_device(cdev); return sysfs_emit(buf, "%d\n", edev->components); } static DEVICE_ATTR_RO(components); static ssize_t id_show(struct device *cdev, struct device_attribute *attr, char *buf) { struct enclosure_device *edev = to_enclosure_device(cdev); if (edev->cb->show_id) return edev->cb->show_id(edev, buf); return -EINVAL; } static DEVICE_ATTR_RO(id); static struct attribute *enclosure_class_attrs[] = { &dev_attr_components.attr, &dev_attr_id.attr, NULL, }; ATTRIBUTE_GROUPS(enclosure_class); static struct class enclosure_class = { .name = "enclosure", .dev_release = enclosure_release, .dev_groups = enclosure_class_groups, }; static const char *const enclosure_status[] = { [ENCLOSURE_STATUS_UNSUPPORTED] = "unsupported", [ENCLOSURE_STATUS_OK] = "OK", [ENCLOSURE_STATUS_CRITICAL] = "critical", [ENCLOSURE_STATUS_NON_CRITICAL] = "non-critical", [ENCLOSURE_STATUS_UNRECOVERABLE] = "unrecoverable", [ENCLOSURE_STATUS_NOT_INSTALLED] = "not installed", [ENCLOSURE_STATUS_UNKNOWN] = "unknown", [ENCLOSURE_STATUS_UNAVAILABLE] = "unavailable", [ENCLOSURE_STATUS_MAX] = NULL, }; static const char *const enclosure_type[] = { [ENCLOSURE_COMPONENT_DEVICE] = "device", [ENCLOSURE_COMPONENT_ARRAY_DEVICE] = "array device", }; static ssize_t get_component_fault(struct device *cdev, struct device_attribute *attr, char *buf) { struct enclosure_device *edev = to_enclosure_device(cdev->parent); struct enclosure_component *ecomp = to_enclosure_component(cdev); if (edev->cb->get_fault) edev->cb->get_fault(edev, ecomp); return sysfs_emit(buf, "%d\n", ecomp->fault); } static ssize_t set_component_fault(struct device *cdev, struct device_attribute *attr, const char *buf, size_t count) { struct enclosure_device *edev = to_enclosure_device(cdev->parent); struct enclosure_component *ecomp = to_enclosure_component(cdev); int val = simple_strtoul(buf, NULL, 0); if (edev->cb->set_fault) edev->cb->set_fault(edev, ecomp, val); return count; } static ssize_t get_component_status(struct device *cdev,