add sysfs mem class [3/5]

diff -Nru a/drivers/char/mem.c b/drivers/char/mem.c
@@ -24,6 +24,7 @@
 #include <linux/smp_lock.h>
 #include <linux/devfs_fs_kernel.h>
 #include <linux/ptrace.h>
+#include <linux/device.h>
 
 #include <asm/uaccess.h>
 #include <asm/io.h>

@@ -676,6 +677,10 @@
 	{11,"kmsg",    S_IRUGO | S_IWUSR,           &kmsg_fops},
 };
 
+static struct class mem_class = {
+	.name	= "mem",
+};
+
 static int __init chr_dev_init(void)
 {
 	int i;

@@ -683,7 +688,11 @@
 	if (register_chrdev(MEM_MAJOR,"mem",&memory_fops))
 		printk("unable to get major %d for memory devs\n", MEM_MAJOR);
 
+	class_register(&mem_class);
 	for (i = 0; i < ARRAY_SIZE(devlist); i++) {
+		simple_add_class_device(&mem_class,
+					MKDEV(MEM_MAJOR, devlist[i].minor),
+					NULL, devlist[i].name);
 		devfs_mk_cdev(MKDEV(MEM_MAJOR, devlist[i].minor),
 				S_IFCHR | devlist[i].mode, devlist[i].name);
 	}