On Fri, 2008-01-18 at 16:52 -0800, Kristen Carlson Accardi wrote:
> On Fri, 18 Jan 2008 18:16:34 -0600
> James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> wrote:
>
> > On Fri, 2008-01-18 at 09:41 -0800, Kristen Carlson Accardi wrote:
> > > On Fri, 18 Jan 2008 11:11:21 -0600
> > > James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> wrote:
> > >
> > > >
> > > > On Fri, 2008-01-18 at 08:52 -0800, Kristen Carlson Accardi wrote:
> > > > > On Thu, 17 Jan 2008 16:50:42 -0600
> > > > > James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> wrote:
> > > > >
> > > > > > On Tue, 2008-01-15 at 16:44 -0800, Kristen Carlson Accardi
> > > > > > wrote:
> > > > > > > Add Enclosure Management support to libata and ahci.
> > > > > > >
> > > > > > > This patch adds support for the LED protocol, as defined in
> > > > > > > the AHCI spec. It adds a generic em_message and em_type
> > > > > > > sysfs entry per host. It also adds a sw_activity field per
> > > > > > > existing drive.
> > > > > > >
> > > > > > > The em_message field can be used by the driver to take
> > > > > > > enclosure management commands from userspace. In the case
> > > > > > > of the LED protocol, writes and reads from em_message
> > > > > > > correspond to the LED message format as defined in the AHCI
> > > > > > > spec.
> > > > > > >
> > > > > > > em_message type is a read only file that displays the
> > > > > > > current enclosure management protocol that is used by the
> > > > > > > driver.
> > > > > > >
> > > > > > > sw_activity is used by drivers which support software
> > > > > > > controlled activity LEDs. It has the following valid values:
> > > > > > >
> > > > > > > 0 OFF - the LED is not activated on activity
> > > > > > > 1 BLINK_ON - the LED blinks on every 10ms when
> > > > > > > activity is detected. 2 BLINK_OFF - the LED is on
> > > > > > > when idle, and blinks off every 10ms when activity is
> > > > > > > detected.
> > > > > > >
> > > > > > > It's important to note that the user must turn sw_activity
> > > > > > > OFF it they wish to control the activity LED via the
> > > > > > > em_message file.
> > > > > >
> > > > > > One of the things we really need to do is to get some type of
> > > > > > generic enclosure support. I note that ahci support three
> > > > > > standard eclosure management protocols (SAF-TE, SES-2,
> > > > > > SFF-8485 SGPIO) as well as the one proprietary one you've
> > > > > > chosen to implement. Is that because no-one in the field has
> > > > > > actually connected AHCI up to anything supporting one of the
> > > > > > standard protocols?
> > > > > >
> > > > > > I'm looking at this from slightly the other way around: the
> > > > > > SAS protocol is virtually mandating SFF-8485 as the enclosure
> > > > > > protocol to the point that it's actually built into the sas
> > > > > > management protocol ... I was starting to wonder how we
> > > > > > should be taking advantage of this.
> > > > > >
> > > > > > The implementation probably should be generic (above SCSI or
> > > > > > IDE or ATA) but it would obviously need to tap into the
> > > > > > subsytem/transport/device specific pieces, so possibly block
> > > > > > looks to be the right place to start?
> > > > > >
> > > > > > James
> > > > > >
> > > > > >
> > > > >
> > > > > I originally thought to try to make a generic enclosure
> > > > > management framework that we could hook individual EM protocols
> > > > > into. Then I started to wonder why we needed to add knowledge
> > > > > of these protocols into the kernel. At least the AHCI hardware
> > > > > which I'm familiar with, has no need to know anything about the
> > > > > protocol. It abstracts everything into just a message. So,
> > > > > the design that I did in this patch does the same thing. You
> > > > > export the type of protocol the driver is configured to accept,
> > > > > then the message buffer and leave it up to user space to
> > > > > understand the individual protocol. This works for all
> > > > > supported EM protocols. As far as I can see, most of these
> > > > > management protocols are better suited to being implemented in
> > > > > user space anyway.
> > > >
> > > > It's one way to look at it, if we go with SFF-8485 and the AHCI
> > > > specific protocol. Basically both of them are only about flashing
> > > > LEDs. The SAF-TE and SES protocols are much more comprehensive
> > > > (and include things like environmental monitors, temperature,
> > > > fans, etc.).
> > >
> > > Even these though can be boiled down to read a message/write a
> > > message.
> >
> > That's true of almost every protocol in the end. I was thinking of
> > the abstraction. The messages lead to flashing lights in the
> > enclosures. They also have interactive knobs that users twiddle on
> > the other end. We really need a uniform user interface abstraction
> > for enclosures.
> >
>
> I guess I'm still not seeing why this abstraction needs to be in the
> kernel. Why can't it be a user space library with a generic buffer to
> send/receive messages.
OK, code demonstrates better I suppose. Here's an enclosure abstraction
that manifests correctly in sysfs and should allow us all (AHCI, SGPIO
and SES) to play in the same sandbox.
James
---
>From c4d1deff6105831ec7d71641aeb74b945474fef2 Mon Sep 17 00:00:00 2001
From: James Bottomley <jejb@xxxxxxxxxxxxxxxxxxxxx>
Date: Sun, 20 Jan 2008 07:34:58 -0600
Subject: [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@xxxxxxxxxxxxxxxxxxxxx>
---
drivers/misc/Kconfig | 10 +
drivers/misc/Makefile | 1 +
drivers/misc/enclosure.c | 409 +++++++++++++++++++++++++++++++++++++++++++++
include/linux/enclosure.h | 116 +++++++++++++
4 files changed, 536 insertions(+), 0 deletions(-)
create mode 100644 drivers/misc/enclosure.c
create mode 100644 include/linux/enclosure.h
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index b5e67c0..c6e5c09 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -11,6 +11,7 @@ menuconfig MISC_DEVICES
If you say N, all options in this submenu will be skipped and disabled.
+
if MISC_DEVICES
config IBM_ASM
@@ -232,4 +233,13 @@ config ATMEL_SSC
If unsure, say N.
+config ENCLOSURE_SERVICES
+ tristate "Enclosure Services"
+ default n
+ help
+ Provides support for intelligent enclosures (bays which
+ contain storage devices). You also need either a host
+ driver (SCSI/ATA) which supports enclosures
+ or a SCSI enclosure device (SES) to use these services.
+
endif # MISC_DEVICES
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 87f2685..de9f1f5 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -17,3 +17,4 @@ obj-$(CONFIG_SONY_LAPTOP) += sony-laptop.o
obj-$(CONFIG_THINKPAD_ACPI) += thinkpad_acpi.o
obj-$(CONFIG_FUJITSU_LAPTOP) += fujitsu-laptop.o
obj-$(CONFIG_EEPROM_93CX6) += eeprom_93cx6.o
+obj-$(CONFIG_ENCLOSURE_SERVICES) += enclosure.o
\ No newline at end of file
diff --git a/drivers/misc/enclosure.c b/drivers/misc/enclosure.c
new file mode 100644
index 0000000..6d4746f
--- /dev/null
+++ b/drivers/misc/enclosure.c
@@ -0,0 +1,409 @@
+/*
+ * Enclosure Services
+ *
+ * Copyright (C) 2008 James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
+ *
+**-----------------------------------------------------------------------------
+**
+** 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>
+
+static LIST_HEAD(container_list);
+static DEFINE_MUTEX(container_list_lock);
+static struct class enclosure_class;
+static struct class enclosure_component_class;
+
+struct enclosure_device *enclosure_find(struct device *dev)
+{
+ struct enclosure_device *edev = NULL;
+
+ mutex_lock(&container_list_lock);
+ list_for_each_entry(edev, &container_list, node) {
+ if (edev->cdev.dev == dev) {
+ mutex_unlock(&container_list_lock);
+ return edev;
+ }
+ }
+ mutex_unlock(&container_list_lock);
+
+ return NULL;
+}
+EXPORT_SYMBOL(enclosure_find);
+
+/**
+ * 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;
+
+ if (!edev)
+ return ERR_PTR(-ENOMEM);
+
+ if (!cb)
+ return ERR_PTR(-EINVAL);
+
+ edev->components = components;
+
+ edev->cdev.class = &enclosure_class;
+ edev->cdev.dev = get_device(dev);
+ edev->cb = cb;
+ snprintf(edev->cdev.class_id, BUS_ID_SIZE, "%s", name);
+ err = class_device_register(&edev->cdev);
+ 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->cdev.dev);
+ 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;
+
+ if (!edev)
+ return;
+
+ 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)
+ class_device_unregister(&edev->component[i].cdev);
+
+ class_device_unregister(&edev->cdev);
+ /* prevent any callbacks into service user */
+ edev->cb = &enclosure_null_callbacks;
+}
+EXPORT_SYMBOL_GPL(enclosure_unregister);
+
+static void enclosure_release(struct class_device *cdev)
+{
+ struct enclosure_device *edev = to_enclosure_device(cdev);
+
+ put_device(cdev->dev);
+ kfree(edev);
+}
+
+static void enclosure_component_release(struct class_device *cdev)
+{
+ if (cdev->dev)
+ put_device(cdev->dev);
+ class_device_put(cdev->parent);
+}
+
+int enclosure_component_register(struct enclosure_device *edev,
+ unsigned int number,
+ enum enclosure_component_type type,
+ const char *name)
+{
+ struct enclosure_component *ecomp;
+ struct class_device *cdev;
+ int err;
+
+ if (!edev || number >= edev->components)
+ return -EINVAL;
+
+ ecomp = &edev->component[number];
+
+ if (ecomp->number != -1)
+ return -EINVAL;
+
+ ecomp->type = type;
+ ecomp->number = number;
+ cdev = &ecomp->cdev;
+ cdev->parent = class_device_get(&edev->cdev);
+ cdev->class = &enclosure_component_class;
+ if (name)
+ snprintf(cdev->class_id, BUS_ID_SIZE, "%s", name);
+ else
+ snprintf(cdev->class_id, BUS_ID_SIZE, "%d", number);
+
+ err = class_device_register(cdev);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(enclosure_component_register);
+
+int enclosure_add_device(struct enclosure_device *edev, int component,
+ struct device *dev)
+{
+ struct class_device *cdev;
+
+ if (!edev || component >= edev->components)
+ return -EINVAL;
+
+ cdev = &edev->component[component].cdev;
+
+ class_device_del(cdev);
+ if (cdev->dev)
+ put_device(cdev->dev);
+ cdev->dev = get_device(dev);
+ return class_device_add(cdev);
+}
+EXPORT_SYMBOL_GPL(enclosure_add_device);
+
+int enclosure_remove_device(struct enclosure_device *edev, int component)
+{
+ struct class_device *cdev;
+
+ if (!edev || component >= edev->components)
+ return -EINVAL;
+
+ cdev = &edev->component[component].cdev;
+
+ class_device_del(cdev);
+ if (cdev->dev)
+ put_device(cdev->dev);
+ cdev->dev = NULL;
+ return class_device_add(cdev);
+}
+EXPORT_SYMBOL_GPL(enclosure_remove_device);
+
+/*
+ * sysfs pieces below
+ */
+
+static ssize_t enclosure_show_components(struct class_device *cdev, char *buf)
+{
+ struct enclosure_device *edev = to_enclosure_device(cdev);
+
+ return snprintf(buf, 40, "%d\n", edev->components);
+}
+
+static struct class_device_attribute enclosure_attrs[] = {
+ __ATTR(components, S_IRUGO, enclosure_show_components, NULL),
+ __ATTR_NULL
+};
+
+static struct class enclosure_class = {
+ .name = "enclosure",
+ .owner = THIS_MODULE,
+ .release = enclosure_release,
+ .class_dev_attrs = enclosure_attrs,
+};
+
+static char *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",
+};
+
+static char *enclosure_type [] = {
+ [ENCLOSURE_COMPONENT_DEVICE] = "device",
+ [ENCLOSURE_COMPONENT_ARRAY_DEVICE] = "array device",
+};
+
+static ssize_t get_component_fault(struct class_device *cdev, 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 class_device *cdev, 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 class_device *cdev, 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 class_device *cdev, 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')
+ 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 class_device *cdev, 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 class_device *cdev, 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 class_device *cdev, 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 class_device *cdev, 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 class_device *cdev, char *buf)
+{
+ struct enclosure_component *ecomp = to_enclosure_component(cdev);
+
+ return snprintf(buf, 40, "%s\n", enclosure_type[ecomp->type]);
+}
+
+
+static struct class_device_attribute enclosure_component_attrs[] = {
+ __ATTR(fault, S_IRUGO | S_IWUSR, get_component_fault,
+ set_component_fault),
+ __ATTR(status, S_IRUGO | S_IWUSR, get_component_status,
+ set_component_status),
+ __ATTR(active, S_IRUGO | S_IWUSR, get_component_active,
+ set_component_active),
+ __ATTR(locate, S_IRUGO | S_IWUSR, get_component_locate,
+ set_component_locate),
+ __ATTR(type, S_IRUGO, get_component_type, NULL),
+ __ATTR_NULL
+};
+
+static struct class enclosure_component_class = {
+ .name = "enclosure_component",
+ .owner = THIS_MODULE,
+ .class_dev_attrs = enclosure_component_attrs,
+ .release = enclosure_component_release,
+};
+
+static int __init enclosure_init(void)
+{
+ int err;
+
+ 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");
diff --git a/include/linux/enclosure.h b/include/linux/enclosure.h
new file mode 100644
index 0000000..cc83acf
--- /dev/null
+++ b/include/linux/enclosure.h
@@ -0,0 +1,116 @@
+/*
+ * Enclosure Services
+ *
+ * Copyright (C) 2008 James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
+ *
+**-----------------------------------------------------------------------------
+**
+** 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 {
+ 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];
+};
+
+#define to_enclosure_device(x) container_of((x), struct enclosure_device, cdev)
+#define to_enclosure_component(x) container_of((x), struct enclosure_component, cdev)
+
+struct enclosure_device *
+enclosure_register(struct device *, const char *, int,
+ struct enclosure_component_callbacks *);
+void enclosure_unregister(struct enclosure_device *);
+int 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);
+
+#endif /* _LINUX_ENCLOSURE_H_ */
--
1.5.3.8
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