Add a hook to disable polling optical media while on battery.

1 files changed, 49 insertions, 0 deletions

diff --git a/pm/power.d/hal-cd-polling b/pm/power.d/hal-cd-polling
new file mode 100755
index 0000000..82eccd5
--- /dev/null
+++ b/pm/power.d/hal-cd-polling
@@ -0,0 +1,49 @@
+#!/bin/sh
+
+. "${PM_FUNCTIONS}"
+
+DISABLE_HAL_POLLING="${DISABLE_HAL_POLLING:-true}"
+
+
+help() {
+    cat <<"EOF"
+---
+$0: Keep HAL from polling optical media for disk insertion
+
+Keep HAL from polling optical media while on battery. This saves a few
+tenths of a watt.
+
+This hook has 1 parameter:
+DISABLE_HAL_POLLING = true or false.
+If true, this hook will turn off the poll HAL does every 2 seconds to see
+if media has been inserted into an optical drive.  
+
+If false, this hook does nothing. 
+
+EOF
+}
+
+stop_polling() {
+    [ "$DISABLE_HAL_POLLING" = "true" ] || exit $NA
+    command_exists hal-disable-polling || exit $NA
+    local disks="$(for c in /dev/cd/*; do readlink -f "$c"; done |sort |uniq)"
+    [ "$disks" ] || exit $NA
+    savestate hal_polling_disks "$disks"
+    for c in $disks; do
+	hal-disable-polling --device "$c"
+    done
+}
+
+restart_polling() {
+    state_exists hal_polling_disks || exit $NA
+    for disk in $(restorestate hal_polling_disks); do
+	hal-disable-polling --enable-polling --device "$disk"
+    done
+}
+
+case $1 in
+    true) stop_polling;;
+    false) restart_polling;;
+    help) help;;
+    *) exit $NA;;
+esac