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Diffstat (limited to 'sys/compat/linuxkpi/common/include/linux/sysfs.h')
-rw-r--r--sys/compat/linuxkpi/common/include/linux/sysfs.h192
1 files changed, 192 insertions, 0 deletions
diff --git a/sys/compat/linuxkpi/common/include/linux/sysfs.h b/sys/compat/linuxkpi/common/include/linux/sysfs.h
new file mode 100644
index 000000000000..e565e43699d6
--- /dev/null
+++ b/sys/compat/linuxkpi/common/include/linux/sysfs.h
@@ -0,0 +1,192 @@
+/*-
+ * Copyright (c) 2010 Isilon Systems, Inc.
+ * Copyright (c) 2010 iX Systems, Inc.
+ * Copyright (c) 2010 Panasas, Inc.
+ * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice unmodified, this list of conditions, and the following
+ * disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+#ifndef _LINUX_SYSFS_H_
+#define _LINUX_SYSFS_H_
+
+#include <sys/sysctl.h>
+
+struct attribute {
+ const char *name;
+ struct module *owner;
+ mode_t mode;
+};
+
+struct sysfs_ops {
+ ssize_t (*show)(struct kobject *, struct attribute *, char *);
+ ssize_t (*store)(struct kobject *, struct attribute *, const char *,
+ size_t);
+};
+
+struct attribute_group {
+ const char *name;
+ mode_t (*is_visible)(struct kobject *,
+ struct attribute *, int);
+ struct attribute **attrs;
+};
+
+#define __ATTR(_name, _mode, _show, _store) { \
+ .attr = { .name = __stringify(_name), .mode = _mode }, \
+ .show = _show, .store = _store, \
+}
+
+#define __ATTR_RO(_name) { \
+ .attr = { .name = __stringify(_name), .mode = 0444 }, \
+ .show = _name##_show, \
+}
+
+#define __ATTR_NULL { .attr = { .name = NULL } }
+
+/*
+ * Handle our generic '\0' terminated 'C' string.
+ * Two cases:
+ * a variable string: point arg1 at it, arg2 is max length.
+ * a constant string: point arg1 at it, arg2 is zero.
+ */
+
+static inline int
+sysctl_handle_attr(SYSCTL_HANDLER_ARGS)
+{
+ struct kobject *kobj;
+ struct attribute *attr;
+ const struct sysfs_ops *ops;
+ char *buf;
+ int error;
+ ssize_t len;
+
+ kobj = arg1;
+ attr = (struct attribute *)arg2;
+ if (kobj->ktype == NULL || kobj->ktype->sysfs_ops == NULL)
+ return (ENODEV);
+ buf = (char *)get_zeroed_page(GFP_KERNEL);
+ if (buf == NULL)
+ return (ENOMEM);
+ ops = kobj->ktype->sysfs_ops;
+ if (ops->show) {
+ len = ops->show(kobj, attr, buf);
+ /*
+ * It's valid to not have a 'show' so just return an
+ * empty string.
+ */
+ if (len < 0) {
+ error = -len;
+ if (error != EIO)
+ goto out;
+ buf[0] = '\0';
+ } else if (len) {
+ len--;
+ if (len >= PAGE_SIZE)
+ len = PAGE_SIZE - 1;
+ /* Trim trailing newline. */
+ buf[len] = '\0';
+ }
+ }
+
+ /* Leave one trailing byte to append a newline. */
+ error = sysctl_handle_string(oidp, buf, PAGE_SIZE - 1, req);
+ if (error != 0 || req->newptr == NULL || ops->store == NULL)
+ goto out;
+ len = strlcat(buf, "\n", PAGE_SIZE);
+ KASSERT(len < PAGE_SIZE, ("new attribute truncated"));
+ len = ops->store(kobj, attr, buf, len);
+ if (len < 0)
+ error = -len;
+out:
+ free_page((unsigned long)buf);
+
+ return (error);
+}
+
+static inline int
+sysfs_create_file(struct kobject *kobj, const struct attribute *attr)
+{
+
+ sysctl_add_oid(NULL, SYSCTL_CHILDREN(kobj->oidp), OID_AUTO,
+ attr->name, CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_MPSAFE, kobj,
+ (uintptr_t)attr, sysctl_handle_attr, "A", "");
+
+ return (0);
+}
+
+static inline void
+sysfs_remove_file(struct kobject *kobj, const struct attribute *attr)
+{
+
+ if (kobj->oidp)
+ sysctl_remove_name(kobj->oidp, attr->name, 1, 1);
+}
+
+static inline void
+sysfs_remove_group(struct kobject *kobj, const struct attribute_group *grp)
+{
+
+ if (kobj->oidp)
+ sysctl_remove_name(kobj->oidp, grp->name, 1, 1);
+}
+
+static inline int
+sysfs_create_group(struct kobject *kobj, const struct attribute_group *grp)
+{
+ struct attribute **attr;
+ struct sysctl_oid *oidp;
+
+ oidp = SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(kobj->oidp),
+ OID_AUTO, grp->name, CTLFLAG_RD|CTLFLAG_MPSAFE, NULL, grp->name);
+ for (attr = grp->attrs; *attr != NULL; attr++) {
+ sysctl_add_oid(NULL, SYSCTL_CHILDREN(oidp), OID_AUTO,
+ (*attr)->name, CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_MPSAFE,
+ kobj, (uintptr_t)*attr, sysctl_handle_attr, "A", "");
+ }
+
+ return (0);
+}
+
+static inline int
+sysfs_create_dir(struct kobject *kobj)
+{
+
+ kobj->oidp = SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(kobj->parent->oidp),
+ OID_AUTO, kobj->name, CTLFLAG_RD|CTLFLAG_MPSAFE, NULL, kobj->name);
+
+ return (0);
+}
+
+static inline void
+sysfs_remove_dir(struct kobject *kobj)
+{
+
+ if (kobj->oidp == NULL)
+ return;
+ sysctl_remove_oid(kobj->oidp, 1, 1);
+}
+
+#define sysfs_attr_init(attr) do {} while(0)
+
+#endif /* _LINUX_SYSFS_H_ */