Add devctl(4) notify support to ACPI. Various subsystems now notify

userland whenever events occur.  See the example in devd.conf below
to see how to use it.

1 files changed, 26 insertions, 0 deletions

diff --git a/etc/devd.conf b/etc/devd.conf
index 2999115..4f46415 100644
--- a/etc/devd.conf
+++ b/etc/devd.conf
@@ -93,4 +93,30 @@ detach 10 {
 	action "/etc/pccard_ether $device-name stop";
 };
 
+# Examples of notify hooks.  A notify is a generic way for a kernel
+# subsystem to send event notification to userland.
+#
+# Here are some examples of ACPI notify handlers.  ACPI subsystems that
+# generate notifies include the AC adapter, power/sleep buttons,
+# control method batteries, lid switch, and thermal zones.
+#
+# Information returned is not always the same as the ACPI notify
+# events.  See the ACPI specification for more information about
+# notifies.  Here is the information returned for each subsystem:
+#
+# ACAD:		AC line state (0 is offline, 1 is online)
+# Button:	Button pressed (0 for power, 1 for sleep)
+# CMBAT:	ACPI battery events
+# Lid:		Lid state (0 is closed, 1 is open)
+# Thermal:	ACPI thermal zone events
+#
+# This example calls a script when the AC state changes, passing the
+# notify value as the first argument.  If the state is 0x00, it might
+# call some sysctls to implement economy mode.  If 0x01, it might set
+# the mode to performance.
+notify 10 {
+	match "system"		"ACPI";
+	match "subsystem"	"ACAD";
+	action			"/etc/acpi_ac $notify";
+};
 */