[PATCH] ipmi: add full sysfs support

Add full driver model support for the IPMI driver.  It links in the proper
bus and device support.

It adds an "ipmi" driver interface that has each BMC discovered by the
driver (as a device).  These BMCs appear in the devices/platform directory.
 If there are multiple interfaces to the same BMC, the driver should
discover this and will only have one BMC entry.  The BMC entry will have
pointers to each interface device that connects to it.

The device information (statistics and config information) has not yet been
ported over to the driver model from proc, that will come later.

This work was based on work by Yani Ioannou.  I basically rewrote it using
that code as a guide, but he still deserves credit :).

[bunk@stusta.de: make ipmi_find_bmc_guid() static]
Signed-off-by: Corey Minyard <minyard@acm.org>
Signed-off-by: Yani Ioannou <yani.ioannou@gmail.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/char/ipmi/ipmi_devintf.c

@@ -90,7 +90,7 @@ static unsigned int ipmi_poll(struct file *file, poll_table *wait)
 
 	spin_lock_irqsave(&priv->recv_msg_lock, flags);
 
-	if (! list_empty(&(priv->recv_msgs)))
+	if (!list_empty(&(priv->recv_msgs)))
 		mask |= (POLLIN | POLLRDNORM);
 
 	spin_unlock_irqrestore(&priv->recv_msg_lock, flags);
@@ -789,21 +789,53 @@ MODULE_PARM_DESC(ipmi_major, "Sets the major number of the IPMI device.  By"
 		 " interface.  Other values will set the major device number"
 		 " to that value.");
 
+/* Keep track of the devices that are registered. */
+struct ipmi_reg_list {
+	dev_t            dev;
+	struct list_head link;
+};
+static LIST_HEAD(reg_list);
+static DEFINE_MUTEX(reg_list_mutex);
+
 static struct class *ipmi_class;
 
-static void ipmi_new_smi(int if_num)
+static void ipmi_new_smi(int if_num, struct device *device)
 {
 	dev_t dev = MKDEV(ipmi_major, if_num);
+	struct ipmi_reg_list *entry;
 
 	devfs_mk_cdev(dev, S_IFCHR | S_IRUSR | S_IWUSR,
 		      "ipmidev/%d", if_num);
 
-	class_device_create(ipmi_class, NULL, dev, NULL, "ipmi%d", if_num);
+	entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+	if (!entry) {
+		printk(KERN_ERR "ipmi_devintf: Unable to create the"
+		       " ipmi class device link\n");
+		return;
+	}
+	entry->dev = dev;
+
+	mutex_lock(&reg_list_mutex);
+	class_device_create(ipmi_class, NULL, dev, device, "ipmi%d", if_num);
+	list_add(&entry->link, &reg_list);
+	mutex_unlock(&reg_list_mutex);
 }
 
 static void ipmi_smi_gone(int if_num)
 {
-	class_device_destroy(ipmi_class, MKDEV(ipmi_major, if_num));
+	dev_t dev = MKDEV(ipmi_major, if_num);
+	struct ipmi_reg_list *entry;
+
+	mutex_lock(&reg_list_mutex);
+	list_for_each_entry(entry, &reg_list, link) {
+		if (entry->dev == dev) {
+			list_del(&entry->link);
+			kfree(entry);
+			break;
+		}
+	}
+	class_device_destroy(ipmi_class, dev);
+	mutex_unlock(&reg_list_mutex);
 	devfs_remove("ipmidev/%d", if_num);
 }
 
@@ -856,6 +888,14 @@ module_init(init_ipmi_devintf);
 
 static __exit void cleanup_ipmi(void)
 {
+	struct ipmi_reg_list *entry, *entry2;
+	mutex_lock(&reg_list_mutex);
+	list_for_each_entry_safe(entry, entry2, &reg_list, link) {
+		list_del(&entry->link);
+		class_device_destroy(ipmi_class, entry->dev);
+		kfree(entry);
+	}
+	mutex_unlock(&reg_list_mutex);
 	class_destroy(ipmi_class);
 	ipmi_smi_watcher_unregister(&smi_watcher);
 	devfs_remove(DEVICE_NAME);