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authorAndi Kleen <andi@firstfloor.org>2010-01-05 12:48:08 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2010-03-07 17:04:48 -0800
commit869dfc875e32fd832385fd52ce54525a10401ed6 (patch)
tree39885759145d7f7c5137fd5e5259181c064ba34c
parent28812fe11a21826ba4c97c6c7971a619987cd912 (diff)
downloadop-kernel-dev-869dfc875e32fd832385fd52ce54525a10401ed6.zip
op-kernel-dev-869dfc875e32fd832385fd52ce54525a10401ed6.tar.gz
driver core: Add class_attr_string for simple read-only string
Several drivers just export a static string as class attributes. Use the new extensible attribute support to define a simple CLASS_ATTR_STRING() macro for this. This will allow to remove code from drivers in followon patches. Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/base/class.c10
-rw-r--r--include/linux/device.h17
2 files changed, 27 insertions, 0 deletions
diff --git a/drivers/base/class.c b/drivers/base/class.c
index 34a2de9..2e297cc 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -490,6 +490,16 @@ void class_interface_unregister(struct class_interface *class_intf)
class_put(parent);
}
+ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
+ char *buf)
+{
+ struct class_attribute_string *cs;
+ cs = container_of(attr, struct class_attribute_string, attr);
+ return snprintf(buf, PAGE_SIZE, "%s\n", cs->str);
+}
+
+EXPORT_SYMBOL_GPL(show_class_attr_string);
+
struct class_compat {
struct kobject *kobj;
};
diff --git a/include/linux/device.h b/include/linux/device.h
index 190f8d3..f95d5bfe 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -265,6 +265,23 @@ extern int __must_check class_create_file(struct class *class,
extern void class_remove_file(struct class *class,
const struct class_attribute *attr);
+/* Simple class attribute that is just a static string */
+
+struct class_attribute_string {
+ struct class_attribute attr;
+ char *str;
+};
+
+/* Currently read-only only */
+#define _CLASS_ATTR_STRING(_name, _mode, _str) \
+ { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
+#define CLASS_ATTR_STRING(_name, _mode, _str) \
+ struct class_attribute_string class_attr_##_name = \
+ _CLASS_ATTR_STRING(_name, _mode, _str)
+
+extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
+ char *buf);
+
struct class_interface {
struct list_head node;
struct class *class;
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