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authorAndi Kleen <andi@firstfloor.org>2008-07-01 18:48:42 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2008-07-21 21:55:02 -0700
commit9800794ac11d4646384b3a310dfd1fe2eed577bf (patch)
treee52c9c91d636c2d3e7891e4edee7e50f1a1ea5d1 /include
parent4a0b2b4dbe1335b8b9886ba3dc85a145d5d938ed (diff)
sysdev: Add utility functions for simple int/ulong variable sysdev attributes
This adds a new sysdev_ext_attribute that stores a pointer to the variable it manages and some utility functions/macro to easily use them. Previously all users wrote custom macros to generate show/store functions for each variable, with this it is possible to avoid that in many cases. Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include')
-rw-r--r--include/linux/sysdev.h34
1 files changed, 34 insertions, 0 deletions
diff --git a/include/linux/sysdev.h b/include/linux/sysdev.h
index 8dcf3162b21..f395bb3fa2f 100644
--- a/include/linux/sysdev.h
+++ b/include/linux/sysdev.h
@@ -119,4 +119,38 @@ struct sysdev_attribute {
extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *);
extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *);
+struct sysdev_ext_attribute {
+ struct sysdev_attribute attr;
+ void *var;
+};
+
+/*
+ * Support for simple variable sysdev attributes.
+ * The pointer to the variable is stored in a sysdev_ext_attribute
+ */
+
+/* Add more types as needed */
+
+extern ssize_t sysdev_show_ulong(struct sys_device *, struct sysdev_attribute *,
+ char *);
+extern ssize_t sysdev_store_ulong(struct sys_device *,
+ struct sysdev_attribute *, const char *, size_t);
+extern ssize_t sysdev_show_int(struct sys_device *, struct sysdev_attribute *,
+ char *);
+extern ssize_t sysdev_store_int(struct sys_device *,
+ struct sysdev_attribute *, const char *, size_t);
+
+#define _SYSDEV_ULONG_ATTR(_name, _mode, _var) \
+ { _SYSDEV_ATTR(_name, _mode, sysdev_show_ulong, sysdev_store_ulong), \
+ &(_var) }
+#define SYSDEV_ULONG_ATTR(_name, _mode, _var) \
+ struct sysdev_ext_attribute attr_##_name = \
+ _SYSDEV_ULONG_ATTR(_name, _mode, _var);
+#define _SYSDEV_INT_ATTR(_name, _mode, _var) \
+ { _SYSDEV_ATTR(_name, _mode, sysdev_show_int, sysdev_store_int), \
+ &(_var) }
+#define SYSDEV_INT_ATTR(_name, _mode, _var) \
+ struct sysdev_ext_attribute attr_##_name = \
+ _SYSDEV_INT_ATTR(_name, _mode, _var);
+
#endif /* _SYSDEV_H_ */