MFp4: Add the ipend() method to the serdev I/F to allow umbrella

	drivers to obtain pending interrupt status from subordinate
	drivers.

1 files changed, 15 insertions, 0 deletions

diff --git a/sys/kern/serdev_if.m b/sys/kern/serdev_if.m
index ce7f572..fbf4363 100644
--- a/sys/kern/serdev_if.m
+++ b/sys/kern/serdev_if.m
@@ -50,6 +50,12 @@ CODE {
 	}
 
 	static int
+	default_ipend(device_t dev)
+	{
+		return (-1);
+	}
+
+	static int
 	default_sysdev(device_t dev)
 	{
 		return (0);
@@ -66,6 +72,15 @@ METHOD serdev_intr_t* ihand {
 	int ipend;
 } DEFAULT default_ihand;
 
+# ipend() - Query pending interrupt status.
+# This method is called by the umbrella driver to obtain interrupt status
+# for the UART in question. This allows the umbrella driver to build a
+# matrix and service the interrupts in the most flexible way by calling
+# interrupt handlers collected with the ihand() method.
+METHOD int ipend {
+	device_t dev;
+} DEFAULT default_ipend;
+
 # sysdev() - Query system device status 
 # This method may be called by the umbrella driver for each child driver
 # to establish if a particular channel and mode is currently being used