initial_commit

1 files changed, 570 insertions, 0 deletions

diff --git a/drivers/misc/enclosure.c b/drivers/misc/enclosure.c
new file mode 100644
index 00000000..00e5fcac
--- /dev/null
+++ b/drivers/misc/enclosure.c
@@ -0,0 +1,570 @@
+/*
+ * 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.
+**
+**-----------------------------------------------------------------------------
+*/
+#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>
+
+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 device_put().
+ * 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
+ * @components:	number of components in the enclosure
+ *
+ * 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(sizeof(struct enclosure_device) +
+			sizeof(struct enclosure_component)*components,
+			GFP_KERNEL);
+	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;
+
+	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
+
+static void enclosure_link_name(struct enclosure_component *cdev, char *name)
+{
+	strcpy(name, "enclosure_device:");
+	strcat(name, dev_name(&cdev->cdev));
+}
+
+static void enclosure_remove_links(struct enclosure_component *cdev)
+{
+	char name[ENCLOSURE_NAME_SIZE];
+
+	enclosure_link_name(cdev, name);
+	sysfs_remove_link(&cdev->dev->kobj, name);
+	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 const struct attribute_group *enclosure_groups[];
+
+/**
+ * enclosure_component_register - add a particular component to an enclosure
+ * @edev:	the enclosure to add the component
+ * @num:	the device number
+ * @type:	the type of component being added
+ * @name:	an optional name to appear in sysfs (leave NULL if none)
+ *
+ * Registers the component.  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_register(struct enclosure_device *edev,
+			     unsigned int number,
+			     enum enclosure_component_type type,
+			     const char *name)
+{
+	struct enclosure_component *ecomp;
+	struct device *cdev;
+	int err;
+
+	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])
+		dev_set_name(cdev, "%s", name);
+	else
+		dev_set_name(cdev, "%u", number);
+
+	cdev->release = enclosure_component_release;
+	cdev->groups = enclosure_groups;
+
+	err = device_register(cdev);
+	if (err) {
+		ecomp->number = -1;
+		put_device(cdev);
+		return ERR_PTR(err);
+	}
+
+	return ecomp;
+}
+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.
+ * @num:	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;
+
+	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);
+	return enclosure_add_links(cdev);
+}
+EXPORT_SYMBOL_GPL(enclosure_add_device);
+
+/**
+ * enclosure_remove_device - remove a device from an enclosure
+ * @edev:	the enclosure device
+ * @num:	the number of the component to remove
+ *
+ * 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);
+			device_del(&cdev->cdev);
+			put_device(dev);
+			cdev->dev = NULL;
+			return device_add(&cdev->cdev);
+		}
+	}
+	return -ENODEV;
+}
+EXPORT_SYMBOL_GPL(enclosure_remove_device);
+
+/*
+ * sysfs pieces below
+ */
+
+static ssize_t enclosure_show_components(struct device *cdev,
+					 struct device_attribute *attr,
+					 char *buf)
+{
+	struct enclosure_device *edev = to_enclosure_device(cdev);
+
+	return snprintf(buf, 40, "%d\n", edev->components);
+}
+
+static struct device_attribute enclosure_attrs[] = {
+	__ATTR(components, S_IRUGO, enclosure_show_components, NULL),
+	__ATTR_NULL
+};
+
+static struct class enclosure_class = {
+	.name			= "enclosure",
+	.owner			= THIS_MODULE,
+	.dev_release		= enclosure_release,
+	.dev_attrs		= enclosure_attrs,
+};
+
+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 snprintf(buf, 40, "%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,
+				    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_status)
+		edev->cb->get_status(edev, ecomp);
+	return snprintf(buf, 40, "%s\n", enclosure_status[ecomp->status]);
+}
+
+static ssize_t set_component_status(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 i;
+
+	for (i = 0; enclosure_status[i]; i++) {
+		if (strncmp(buf, enclosure_status[i],
+			    strlen(enclosure_status[i])) == 0 &&
+		    (buf[strlen(enclosure_status[i])] == '\n' ||
+		     buf[strlen(enclosure_status[i])] == '\0'))
+			break;
+	}
+
+	if (enclosure_status[i] && edev->cb->set_status) {
+		edev->cb->set_status(edev, ecomp, i);
+		return count;
+	} else
+		return -EINVAL;
+}
+
+static ssize_t get_component_active(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_active)
+		edev->cb->get_active(edev, ecomp);
+	return snprintf(buf, 40, "%d\n", ecomp->active);
+}
+
+static ssize_t set_component_active(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_active)
+		edev->cb->set_active(edev, ecomp, val);
+	return count;
+}
+
+static ssize_t get_component_locate(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_locate)
+		edev->cb->get_locate(edev, ecomp);
+	return snprintf(buf, 40, "%d\n", ecomp->locate);
+}
+
+static ssize_t set_component_locate(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_locate)
+		edev->cb->set_locate(edev, ecomp, val);
+	return count;
+}
+
+static ssize_t get_component_type(struct device *cdev,
+				  struct device_attribute *attr, char *buf)
+{
+	struct enclosure_component *ecomp = to_enclosure_component(cdev);
+
+	return snprintf(buf, 40, "%s\n", enclosure_type[ecomp->type]);
+}
+
+
+static DEVICE_ATTR(fault, S_IRUGO | S_IWUSR, get_component_fault,
+		    set_component_fault);
+static DEVICE_ATTR(status, S_IRUGO | S_IWUSR, get_component_status,
+		   set_component_status);
+static DEVICE_ATTR(active, S_IRUGO | S_IWUSR, get_component_active,
+		   set_component_active);
+static DEVICE_ATTR(locate, S_IRUGO | S_IWUSR, get_component_locate,
+		   set_component_locate);
+static DEVICE_ATTR(type, S_IRUGO, get_component_type, NULL);
+
+static struct attribute *enclosure_component_attrs[] = {
+	&dev_attr_fault.attr,
+	&dev_attr_status.attr,
+	&dev_attr_active.attr,
+	&dev_attr_locate.attr,
+	&dev_attr_type.attr,
+	NULL
+};
+
+static struct attribute_group enclosure_group = {
+	.attrs = enclosure_component_attrs,
+};
+
+static const struct attribute_group *enclosure_groups[] = {
+	&enclosure_group,
+	NULL
+};
+
+static int __init enclosure_init(void)
+{
+	int err;
+
+	err = class_register(&enclosure_class);
+	if (err)
+		return err;
+
+	return 0;
+}
+
+static void __exit enclosure_exit(void)
+{
+	class_unregister(&enclosure_class);
+}
+
+module_init(enclosure_init);
+module_exit(enclosure_exit);
+
+MODULE_AUTHOR("James Bottomley");
+MODULE_DESCRIPTION("Enclosure Services");
+MODULE_LICENSE("GPL v2");