Index: sys/compat/linuxkpi/common/include/linux/sysfs.h
===================================================================
--- sys/compat/linuxkpi/common/include/linux/sysfs.h
+++ sys/compat/linuxkpi/common/include/linux/sysfs.h
@@ -50,6 +50,15 @@
 	struct attribute	**attrs;
 };
 
+struct bin_attribute {
+	struct attribute	attr;
+	size_t			size;
+	ssize_t (*read)(struct file *, struct kobject *, struct bin_attribute *,
+			char *, loff_t, size_t);
+	ssize_t (*write)(struct file *, struct kobject *, struct bin_attribute *,
+			 char *, loff_t, size_t);
+};
+
 #define	__ATTR(_name, _mode, _show, _store) {				\
 	.attr = { .name = __stringify(_name), .mode = _mode },		\
 	.show = _show, .store  = _store,				\
@@ -155,6 +164,82 @@
 		sysctl_remove_name(kobj->oidp, attr->name, 1, 1);
 }
 
+static inline int
+sysctl_handle_bin_attr(SYSCTL_HANDLER_ARGS)
+{
+	struct kobject *kobj;
+	struct bin_attribute *attr;
+	char *buf;
+	int error;
+	ssize_t len;
+
+	kobj = arg1;
+	attr = (struct bin_attribute *)(intptr_t)arg2;
+	if (kobj->ktype == NULL || kobj->ktype->sysfs_ops == NULL)
+		return (ENODEV);
+	buf = (char *)get_zeroed_page(GFP_KERNEL);
+	if (buf == NULL)
+		return (ENOMEM);
+
+	if (attr->read) {
+		len = attr->read(
+		    NULL, /* <-- struct file, unimplemented */
+		    kobj, attr, buf, req->oldidx, PAGE_SIZE);
+		if (len < 0) {
+			error = -len;
+			if (error != EIO)
+				goto out;
+		}
+	}
+
+	error = sysctl_handle_string(oidp, buf, PAGE_SIZE, req);
+	if (error != 0 || req->newptr == NULL || attr->write == NULL)
+		goto out;
+
+	len = attr->write(
+	    NULL, /* <-- struct file, unimplemented */
+	    kobj, attr, buf, req->newidx, req->newlen);
+	if (len < 0)
+		error = -len;
+out:
+	free_page((unsigned long)buf);
+
+	return (error);
+}
+
+static inline int
+sysfs_create_bin_file(struct kobject *kobj, const struct bin_attribute *attr)
+{
+	struct sysctl_oid *oid;
+	int ctlflags;
+
+	ctlflags = CTLTYPE_OPAQUE | CTLFLAG_MPSAFE;
+	if (attr->attr.mode & (S_IRUSR | S_IWUSR)) {
+		ctlflags |= CTLFLAG_RW;
+	} else if (attr->attr.mode & S_IRUSR) {
+		ctlflags |= CTLFLAG_RD;
+	} else if (attr->attr.mode & S_IWUSR) {
+		ctlflags |= CTLFLAG_WR;
+	}
+
+	oid = SYSCTL_ADD_OID(NULL, SYSCTL_CHILDREN(kobj->oidp), OID_AUTO,
+	    attr->attr.name, ctlflags, kobj,
+	    (uintptr_t)attr, sysctl_handle_bin_attr, "", "");
+	if (!oid) {
+		return (-ENOMEM);
+	}
+
+	return (0);
+}
+
+static inline void
+sysfs_remove_bin_file(struct kobject *kobj, const struct bin_attribute *attr)
+{
+
+	if (kobj->oidp)
+		sysctl_remove_name(kobj->oidp, attr->attr.name, 1, 1);
+}
+
 static inline int
 sysfs_create_link(struct kobject *kobj __unused,
     struct kobject *target __unused, const char *name __unused)