[PATCH 2/3] drivers: add a new device_create_file_uevent API

[Bryan Wu <bryan.wu@canonical.com>]

This will use sysfs_create_file_uevent to create a sysfs file and send out
a uevent to userspace application such as udev.

Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
---
 drivers/base/core.c    | 19 +++++++++++++++++++
 include/linux/device.h |  4 ++++
 2 files changed, 23 insertions(+)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 346be8b..62fd266 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -538,6 +538,25 @@ int device_create_file(struct device *dev,
 }
 
 /**
+ * device_create_file_uevent - create sysfs attribute file for device
+ *				and send a uevent to userspace.
+ * @dev: device.
+ * @attr: device attribute descriptor.
+ * @desc: description about the uevent.
+ * @action: kobject uevent action type.
+ */
+int device_create_file_uevent(struct device *dev,
+		       const struct device_attribute *attr,
+		       const char *desc,
+		       enum kobject_action action)
+{
+	int error = 0;
+	if (dev)
+		error = sysfs_create_file_uevent(&dev->kobj, &attr->attr,
+						 desc, action);
+	return error;
+}
+/**
  * device_remove_file - remove sysfs attribute file.
  * @dev: device.
  * @attr: device attribute descriptor.
diff --git a/include/linux/device.h b/include/linux/device.h
index 6de9415..d1545f3 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -510,6 +510,10 @@ ssize_t device_store_int(struct device *dev, struct device_attribute *attr,
 
 extern int device_create_file(struct device *device,
 			      const struct device_attribute *entry);
+extern int device_create_file_uevent(struct device *dev,
+				const struct device_attribute *attr,
+			       const char *desc,
+			       enum kobject_action action);
 extern void device_remove_file(struct device *dev,
 			       const struct device_attribute *attr);
 extern int __must_check device_create_bin_file(struct device *dev,
-- 
1.7.11.1