consistent key naming to match only the event device or include all parent devices

This scheme is more consistent and makes it obvious if a match happens
against the event device only, or the full chain of parent devices.

The old key names are now:
  BUS -> SUBSYSTEMS
  ID -> KERNELS
  SYSFS -> ATTRS
  DRIVER -> DRIVERS

Match keys for the event device:
  KERNEL
  SUBSYSTEM
  ATTR
  DRIVER (in a future release, for now the same as DRIVERS)

Match keys for all devices along the parent device chain:
  KERNELS
  SUBSYSTEMS
  ATTRS
  DRIVERS

ID, BUS, SYSFS are no longer mentioned in the man page but still work.
DRIVER must be converted to DRIVERS to match the new scheme. For now,
an error is logged, if DRIVER is used. In a future release, the DRIVER
key behaviour will change.

1 files changed, 2 insertions, 2 deletions

diff --git a/udev.h b/udev.h
index a69ce0893f..d681ad5613 100644
--- a/udev.h
+++ b/udev.h
@@ -54,8 +54,8 @@ struct sysfs_device {
 	struct list_head node;			/* for device cache */
 	struct sysfs_device *parent;		/* already cached parent*/
 	char devpath[PATH_SIZE];
-	char subsystem[NAME_SIZE];		/* $class/$bus/"drivers" */
-	char kernel_name[NAME_SIZE];		/* device instance name */
+	char subsystem[NAME_SIZE];		/* $class, $bus, drivers, module */
+	char kernel[NAME_SIZE];			/* device instance name */
 	char kernel_number[NAME_SIZE];
 	char driver[NAME_SIZE];			/* device driver name */
 };