[SCSI] enclosure: add support for enclosure services
The enclosure misc device is really just a library providing sysfs support for physical enclosure devices and their components. Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
James Bottomley
parent
38582a62ec
commit
d569d5bb3f
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@ -285,4 +285,13 @@ config INTEL_MENLOW
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If unsure, say N.
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config ENCLOSURE_SERVICES
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tristate "Enclosure Services"
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default n
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help
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Provides support for intelligent enclosures (bays which
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contain storage devices). You also need either a host
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driver (SCSI/ATA) which supports enclosures
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or a SCSI enclosure device (SES) to use these services.
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endif # MISC_DEVICES
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@ -20,3 +20,4 @@ obj-$(CONFIG_THINKPAD_ACPI) += thinkpad_acpi.o
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obj-$(CONFIG_FUJITSU_LAPTOP) += fujitsu-laptop.o
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obj-$(CONFIG_EEPROM_93CX6) += eeprom_93cx6.o
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obj-$(CONFIG_INTEL_MENLOW) += intel_menlow.o
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obj-$(CONFIG_ENCLOSURE_SERVICES) += enclosure.o
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@ -0,0 +1,484 @@
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/*
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* Enclosure Services
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*
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* Copyright (C) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
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*
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**-----------------------------------------------------------------------------
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**
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** This program is free software; you can redistribute it and/or
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** modify it under the terms of the GNU General Public License
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** version 2 as published by the Free Software Foundation.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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**
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**-----------------------------------------------------------------------------
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*/
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#include <linux/device.h>
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#include <linux/enclosure.h>
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#include <linux/err.h>
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#include <linux/list.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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static LIST_HEAD(container_list);
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static DEFINE_MUTEX(container_list_lock);
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static struct class enclosure_class;
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static struct class enclosure_component_class;
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/**
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* enclosure_find - find an enclosure given a device
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* @dev: the device to find for
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*
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* Looks through the list of registered enclosures to see
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* if it can find a match for a device. Returns NULL if no
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* enclosure is found. Obtains a reference to the enclosure class
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* device which must be released with class_device_put().
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*/
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struct enclosure_device *enclosure_find(struct device *dev)
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{
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struct enclosure_device *edev = NULL;
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mutex_lock(&container_list_lock);
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list_for_each_entry(edev, &container_list, node) {
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if (edev->cdev.dev == dev) {
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class_device_get(&edev->cdev);
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mutex_unlock(&container_list_lock);
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return edev;
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}
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}
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mutex_unlock(&container_list_lock);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(enclosure_find);
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/**
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* enclosure_for_each_device - calls a function for each enclosure
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* @fn: the function to call
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* @data: the data to pass to each call
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*
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* Loops over all the enclosures calling the function.
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*
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* Note, this function uses a mutex which will be held across calls to
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* @fn, so it must have non atomic context, and @fn may (although it
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* should not) sleep or otherwise cause the mutex to be held for
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* indefinite periods
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*/
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int enclosure_for_each_device(int (*fn)(struct enclosure_device *, void *),
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void *data)
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{
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int error = 0;
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struct enclosure_device *edev;
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mutex_lock(&container_list_lock);
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list_for_each_entry(edev, &container_list, node) {
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error = fn(edev, data);
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if (error)
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break;
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}
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mutex_unlock(&container_list_lock);
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return error;
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}
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EXPORT_SYMBOL_GPL(enclosure_for_each_device);
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/**
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* enclosure_register - register device as an enclosure
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*
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* @dev: device containing the enclosure
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* @components: number of components in the enclosure
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*
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* This sets up the device for being an enclosure. Note that @dev does
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* not have to be a dedicated enclosure device. It may be some other type
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* of device that additionally responds to enclosure services
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*/
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struct enclosure_device *
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enclosure_register(struct device *dev, const char *name, int components,
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struct enclosure_component_callbacks *cb)
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{
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struct enclosure_device *edev =
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kzalloc(sizeof(struct enclosure_device) +
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sizeof(struct enclosure_component)*components,
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GFP_KERNEL);
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int err, i;
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BUG_ON(!cb);
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if (!edev)
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return ERR_PTR(-ENOMEM);
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edev->components = components;
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edev->cdev.class = &enclosure_class;
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edev->cdev.dev = get_device(dev);
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edev->cb = cb;
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snprintf(edev->cdev.class_id, BUS_ID_SIZE, "%s", name);
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err = class_device_register(&edev->cdev);
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if (err)
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goto err;
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for (i = 0; i < components; i++)
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edev->component[i].number = -1;
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mutex_lock(&container_list_lock);
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list_add_tail(&edev->node, &container_list);
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mutex_unlock(&container_list_lock);
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return edev;
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err:
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put_device(edev->cdev.dev);
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kfree(edev);
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return ERR_PTR(err);
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}
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EXPORT_SYMBOL_GPL(enclosure_register);
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static struct enclosure_component_callbacks enclosure_null_callbacks;
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/**
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* enclosure_unregister - remove an enclosure
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*
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* @edev: the registered enclosure to remove;
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*/
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void enclosure_unregister(struct enclosure_device *edev)
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{
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int i;
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mutex_lock(&container_list_lock);
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list_del(&edev->node);
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mutex_unlock(&container_list_lock);
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for (i = 0; i < edev->components; i++)
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if (edev->component[i].number != -1)
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class_device_unregister(&edev->component[i].cdev);
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/* prevent any callbacks into service user */
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edev->cb = &enclosure_null_callbacks;
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class_device_unregister(&edev->cdev);
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}
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EXPORT_SYMBOL_GPL(enclosure_unregister);
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static void enclosure_release(struct class_device *cdev)
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{
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struct enclosure_device *edev = to_enclosure_device(cdev);
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put_device(cdev->dev);
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kfree(edev);
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}
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static void enclosure_component_release(struct class_device *cdev)
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{
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if (cdev->dev)
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put_device(cdev->dev);
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class_device_put(cdev->parent);
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}
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/**
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* enclosure_component_register - add a particular component to an enclosure
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* @edev: the enclosure to add the component
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* @num: the device number
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* @type: the type of component being added
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* @name: an optional name to appear in sysfs (leave NULL if none)
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*
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* Registers the component. The name is optional for enclosures that
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* give their components a unique name. If not, leave the field NULL
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* and a name will be assigned.
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*
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* Returns a pointer to the enclosure component or an error.
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*/
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struct enclosure_component *
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enclosure_component_register(struct enclosure_device *edev,
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unsigned int number,
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enum enclosure_component_type type,
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const char *name)
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{
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struct enclosure_component *ecomp;
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struct class_device *cdev;
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int err;
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if (number >= edev->components)
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return ERR_PTR(-EINVAL);
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ecomp = &edev->component[number];
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if (ecomp->number != -1)
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return ERR_PTR(-EINVAL);
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ecomp->type = type;
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ecomp->number = number;
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cdev = &ecomp->cdev;
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cdev->parent = class_device_get(&edev->cdev);
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cdev->class = &enclosure_component_class;
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if (name)
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snprintf(cdev->class_id, BUS_ID_SIZE, "%s", name);
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else
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snprintf(cdev->class_id, BUS_ID_SIZE, "%u", number);
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err = class_device_register(cdev);
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if (err)
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ERR_PTR(err);
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return ecomp;
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}
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EXPORT_SYMBOL_GPL(enclosure_component_register);
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/**
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* enclosure_add_device - add a device as being part of an enclosure
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* @edev: the enclosure device being added to.
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* @num: the number of the component
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* @dev: the device being added
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*
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* Declares a real device to reside in slot (or identifier) @num of an
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* enclosure. This will cause the relevant sysfs links to appear.
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* This function may also be used to change a device associated with
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* an enclosure without having to call enclosure_remove_device() in
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* between.
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*
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* Returns zero on success or an error.
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*/
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int enclosure_add_device(struct enclosure_device *edev, int component,
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struct device *dev)
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{
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struct class_device *cdev;
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if (!edev || component >= edev->components)
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return -EINVAL;
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cdev = &edev->component[component].cdev;
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class_device_del(cdev);
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if (cdev->dev)
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put_device(cdev->dev);
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cdev->dev = get_device(dev);
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return class_device_add(cdev);
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}
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EXPORT_SYMBOL_GPL(enclosure_add_device);
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/**
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* enclosure_remove_device - remove a device from an enclosure
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* @edev: the enclosure device
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* @num: the number of the component to remove
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*
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* Returns zero on success or an error.
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*
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*/
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int enclosure_remove_device(struct enclosure_device *edev, int component)
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{
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struct class_device *cdev;
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if (!edev || component >= edev->components)
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return -EINVAL;
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cdev = &edev->component[component].cdev;
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class_device_del(cdev);
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if (cdev->dev)
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put_device(cdev->dev);
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cdev->dev = NULL;
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return class_device_add(cdev);
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}
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EXPORT_SYMBOL_GPL(enclosure_remove_device);
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/*
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* sysfs pieces below
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*/
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static ssize_t enclosure_show_components(struct class_device *cdev, char *buf)
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{
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struct enclosure_device *edev = to_enclosure_device(cdev);
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return snprintf(buf, 40, "%d\n", edev->components);
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}
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static struct class_device_attribute enclosure_attrs[] = {
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__ATTR(components, S_IRUGO, enclosure_show_components, NULL),
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__ATTR_NULL
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};
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static struct class enclosure_class = {
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.name = "enclosure",
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.owner = THIS_MODULE,
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.release = enclosure_release,
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.class_dev_attrs = enclosure_attrs,
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};
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static const char *const enclosure_status [] = {
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[ENCLOSURE_STATUS_UNSUPPORTED] = "unsupported",
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[ENCLOSURE_STATUS_OK] = "OK",
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[ENCLOSURE_STATUS_CRITICAL] = "critical",
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[ENCLOSURE_STATUS_NON_CRITICAL] = "non-critical",
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[ENCLOSURE_STATUS_UNRECOVERABLE] = "unrecoverable",
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[ENCLOSURE_STATUS_NOT_INSTALLED] = "not installed",
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[ENCLOSURE_STATUS_UNKNOWN] = "unknown",
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[ENCLOSURE_STATUS_UNAVAILABLE] = "unavailable",
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};
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static const char *const enclosure_type [] = {
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[ENCLOSURE_COMPONENT_DEVICE] = "device",
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[ENCLOSURE_COMPONENT_ARRAY_DEVICE] = "array device",
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};
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static ssize_t get_component_fault(struct class_device *cdev, char *buf)
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{
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struct enclosure_device *edev = to_enclosure_device(cdev->parent);
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struct enclosure_component *ecomp = to_enclosure_component(cdev);
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if (edev->cb->get_fault)
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edev->cb->get_fault(edev, ecomp);
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return snprintf(buf, 40, "%d\n", ecomp->fault);
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}
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static ssize_t set_component_fault(struct class_device *cdev, const char *buf,
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size_t count)
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{
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struct enclosure_device *edev = to_enclosure_device(cdev->parent);
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struct enclosure_component *ecomp = to_enclosure_component(cdev);
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int val = simple_strtoul(buf, NULL, 0);
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if (edev->cb->set_fault)
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edev->cb->set_fault(edev, ecomp, val);
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return count;
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}
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static ssize_t get_component_status(struct class_device *cdev, char *buf)
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{
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struct enclosure_device *edev = to_enclosure_device(cdev->parent);
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struct enclosure_component *ecomp = to_enclosure_component(cdev);
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if (edev->cb->get_status)
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edev->cb->get_status(edev, ecomp);
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return snprintf(buf, 40, "%s\n", enclosure_status[ecomp->status]);
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}
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static ssize_t set_component_status(struct class_device *cdev, const char *buf,
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size_t count)
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{
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struct enclosure_device *edev = to_enclosure_device(cdev->parent);
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struct enclosure_component *ecomp = to_enclosure_component(cdev);
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int i;
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for (i = 0; enclosure_status[i]; i++) {
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if (strncmp(buf, enclosure_status[i],
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strlen(enclosure_status[i])) == 0 &&
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(buf[strlen(enclosure_status[i])] == '\n' ||
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buf[strlen(enclosure_status[i])] == '\0'))
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break;
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}
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if (enclosure_status[i] && edev->cb->set_status) {
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edev->cb->set_status(edev, ecomp, i);
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return count;
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} else
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return -EINVAL;
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}
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static ssize_t get_component_active(struct class_device *cdev, char *buf)
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{
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struct enclosure_device *edev = to_enclosure_device(cdev->parent);
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struct enclosure_component *ecomp = to_enclosure_component(cdev);
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if (edev->cb->get_active)
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edev->cb->get_active(edev, ecomp);
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return snprintf(buf, 40, "%d\n", ecomp->active);
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}
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static ssize_t set_component_active(struct class_device *cdev, const char *buf,
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size_t count)
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{
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struct enclosure_device *edev = to_enclosure_device(cdev->parent);
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struct enclosure_component *ecomp = to_enclosure_component(cdev);
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int val = simple_strtoul(buf, NULL, 0);
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if (edev->cb->set_active)
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edev->cb->set_active(edev, ecomp, val);
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return count;
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}
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static ssize_t get_component_locate(struct class_device *cdev, char *buf)
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{
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struct enclosure_device *edev = to_enclosure_device(cdev->parent);
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struct enclosure_component *ecomp = to_enclosure_component(cdev);
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if (edev->cb->get_locate)
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edev->cb->get_locate(edev, ecomp);
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return snprintf(buf, 40, "%d\n", ecomp->locate);
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}
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static ssize_t set_component_locate(struct class_device *cdev, const char *buf,
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size_t count)
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{
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struct enclosure_device *edev = to_enclosure_device(cdev->parent);
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struct enclosure_component *ecomp = to_enclosure_component(cdev);
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int val = simple_strtoul(buf, NULL, 0);
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if (edev->cb->set_locate)
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edev->cb->set_locate(edev, ecomp, val);
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return count;
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}
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static ssize_t get_component_type(struct class_device *cdev, char *buf)
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{
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struct enclosure_component *ecomp = to_enclosure_component(cdev);
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return snprintf(buf, 40, "%s\n", enclosure_type[ecomp->type]);
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}
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static struct class_device_attribute enclosure_component_attrs[] = {
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__ATTR(fault, S_IRUGO | S_IWUSR, get_component_fault,
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set_component_fault),
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__ATTR(status, S_IRUGO | S_IWUSR, get_component_status,
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set_component_status),
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__ATTR(active, S_IRUGO | S_IWUSR, get_component_active,
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set_component_active),
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__ATTR(locate, S_IRUGO | S_IWUSR, get_component_locate,
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set_component_locate),
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__ATTR(type, S_IRUGO, get_component_type, NULL),
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__ATTR_NULL
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};
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static struct class enclosure_component_class = {
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.name = "enclosure_component",
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.owner = THIS_MODULE,
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.class_dev_attrs = enclosure_component_attrs,
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.release = enclosure_component_release,
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};
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static int __init enclosure_init(void)
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{
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int err;
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||||
|
||||
err = class_register(&enclosure_class);
|
||||
if (err)
|
||||
return err;
|
||||
err = class_register(&enclosure_component_class);
|
||||
if (err)
|
||||
goto err_out;
|
||||
|
||||
return 0;
|
||||
err_out:
|
||||
class_unregister(&enclosure_class);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static void __exit enclosure_exit(void)
|
||||
{
|
||||
class_unregister(&enclosure_component_class);
|
||||
class_unregister(&enclosure_class);
|
||||
}
|
||||
|
||||
module_init(enclosure_init);
|
||||
module_exit(enclosure_exit);
|
||||
|
||||
MODULE_AUTHOR("James Bottomley");
|
||||
MODULE_DESCRIPTION("Enclosure Services");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -0,0 +1,129 @@
|
|||
/*
|
||||
* Enclosure Services
|
||||
*
|
||||
* Copyright (C) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
|
||||
*
|
||||
**-----------------------------------------------------------------------------
|
||||
**
|
||||
** This program is free software; you can redistribute it and/or
|
||||
** modify it under the terms of the GNU General Public License
|
||||
** version 2 as published by the Free Software Foundation.
|
||||
**
|
||||
** This program is distributed in the hope that it will be useful,
|
||||
** but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
** GNU General Public License for more details.
|
||||
**
|
||||
** You should have received a copy of the GNU General Public License
|
||||
** along with this program; if not, write to the Free Software
|
||||
** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||||
**
|
||||
**-----------------------------------------------------------------------------
|
||||
*/
|
||||
#ifndef _LINUX_ENCLOSURE_H_
|
||||
#define _LINUX_ENCLOSURE_H_
|
||||
|
||||
#include <linux/device.h>
|
||||
#include <linux/list.h>
|
||||
|
||||
/* A few generic types ... taken from ses-2 */
|
||||
enum enclosure_component_type {
|
||||
ENCLOSURE_COMPONENT_DEVICE = 0x01,
|
||||
ENCLOSURE_COMPONENT_ARRAY_DEVICE = 0x17,
|
||||
};
|
||||
|
||||
/* ses-2 common element status */
|
||||
enum enclosure_status {
|
||||
ENCLOSURE_STATUS_UNSUPPORTED = 0,
|
||||
ENCLOSURE_STATUS_OK,
|
||||
ENCLOSURE_STATUS_CRITICAL,
|
||||
ENCLOSURE_STATUS_NON_CRITICAL,
|
||||
ENCLOSURE_STATUS_UNRECOVERABLE,
|
||||
ENCLOSURE_STATUS_NOT_INSTALLED,
|
||||
ENCLOSURE_STATUS_UNKNOWN,
|
||||
ENCLOSURE_STATUS_UNAVAILABLE,
|
||||
};
|
||||
|
||||
/* SFF-8485 activity light settings */
|
||||
enum enclosure_component_setting {
|
||||
ENCLOSURE_SETTING_DISABLED = 0,
|
||||
ENCLOSURE_SETTING_ENABLED = 1,
|
||||
ENCLOSURE_SETTING_BLINK_A_ON_OFF = 2,
|
||||
ENCLOSURE_SETTING_BLINK_A_OFF_ON = 3,
|
||||
ENCLOSURE_SETTING_BLINK_B_ON_OFF = 6,
|
||||
ENCLOSURE_SETTING_BLINK_B_OFF_ON = 7,
|
||||
};
|
||||
|
||||
struct enclosure_device;
|
||||
struct enclosure_component;
|
||||
struct enclosure_component_callbacks {
|
||||
void (*get_status)(struct enclosure_device *,
|
||||
struct enclosure_component *);
|
||||
int (*set_status)(struct enclosure_device *,
|
||||
struct enclosure_component *,
|
||||
enum enclosure_status);
|
||||
void (*get_fault)(struct enclosure_device *,
|
||||
struct enclosure_component *);
|
||||
int (*set_fault)(struct enclosure_device *,
|
||||
struct enclosure_component *,
|
||||
enum enclosure_component_setting);
|
||||
void (*get_active)(struct enclosure_device *,
|
||||
struct enclosure_component *);
|
||||
int (*set_active)(struct enclosure_device *,
|
||||
struct enclosure_component *,
|
||||
enum enclosure_component_setting);
|
||||
void (*get_locate)(struct enclosure_device *,
|
||||
struct enclosure_component *);
|
||||
int (*set_locate)(struct enclosure_device *,
|
||||
struct enclosure_component *,
|
||||
enum enclosure_component_setting);
|
||||
};
|
||||
|
||||
|
||||
struct enclosure_component {
|
||||
void *scratch;
|
||||
struct class_device cdev;
|
||||
enum enclosure_component_type type;
|
||||
int number;
|
||||
int fault;
|
||||
int active;
|
||||
int locate;
|
||||
enum enclosure_status status;
|
||||
};
|
||||
|
||||
struct enclosure_device {
|
||||
void *scratch;
|
||||
struct list_head node;
|
||||
struct class_device cdev;
|
||||
struct enclosure_component_callbacks *cb;
|
||||
int components;
|
||||
struct enclosure_component component[0];
|
||||
};
|
||||
|
||||
static inline struct enclosure_device *
|
||||
to_enclosure_device(struct class_device *dev)
|
||||
{
|
||||
return container_of(dev, struct enclosure_device, cdev);
|
||||
}
|
||||
|
||||
static inline struct enclosure_component *
|
||||
to_enclosure_component(struct class_device *dev)
|
||||
{
|
||||
return container_of(dev, struct enclosure_component, cdev);
|
||||
}
|
||||
|
||||
struct enclosure_device *
|
||||
enclosure_register(struct device *, const char *, int,
|
||||
struct enclosure_component_callbacks *);
|
||||
void enclosure_unregister(struct enclosure_device *);
|
||||
struct enclosure_component *
|
||||
enclosure_component_register(struct enclosure_device *, unsigned int,
|
||||
enum enclosure_component_type, const char *);
|
||||
int enclosure_add_device(struct enclosure_device *enclosure, int component,
|
||||
struct device *dev);
|
||||
int enclosure_remove_device(struct enclosure_device *enclosure, int component);
|
||||
struct enclosure_device *enclosure_find(struct device *dev);
|
||||
int enclosure_for_each_device(int (*fn)(struct enclosure_device *, void *),
|
||||
void *data);
|
||||
|
||||
#endif /* _LINUX_ENCLOSURE_H_ */
|
||||
Loading…
Reference in New Issue