[budybox] rtcwake patch: Default to rtc0

1) This is what rtcwake from util-linux does
2) While /dev/rtc is usually a symlink to /dev/rtc0,
   /sys/class/rtc/%s/device/power/wakeup doesn't exist
   for rtc (no symlink under /sys/class/rtc), so bb rtcwake
   will bail out early claiming the selected rtc does not
   support wakeup alarms, while really it just didn't find
   a file to check for support.

2 files changed, 16 insertions, 0 deletions

diff --git a/core/modules/busybox/module.build b/core/modules/busybox/module.build
index 2721dd04..3124de81 100644
--- a/core/modules/busybox/module.build
+++ b/core/modules/busybox/module.build
@@ -15,6 +15,9 @@ fetch_source() {
 	if ! grep -q 'suspend.*"no"' "util-linux/rtcwake.c"; then
 		git apply "${MODULE_DIR}/rtcwake-mode-no.patch" || perror "Could not apply busybox patch for rtcwake 'no'-mode"
 	fi
+	if ! grep -q 'rtc0' "util-linux/rtcwake.c"; then
+		git apply "${MODULE_DIR}/rtcwake-default-rtc0.patch" || perror "Could not apply busybox patch for rtcwake default to rtc0"
+	fi
 	cd .. || perror "cd .. failed"
 }
 
diff --git a/core/modules/busybox/rtcwake-default-rtc0.patch b/core/modules/busybox/rtcwake-default-rtc0.patch
new file mode 100644
index 00000000..cc411cd5
--- /dev/null
+++ b/core/modules/busybox/rtcwake-default-rtc0.patch
@@ -0,0 +1,13 @@
+diff --git a/util-linux/rtcwake.c b/util-linux/rtcwake.c
+index 8aee0cf..6693305 100644
+--- a/util-linux/rtcwake.c
++++ b/util-linux/rtcwake.c
+@@ -122,7 +122,7 @@ int rtcwake_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+ int rtcwake_main(int argc UNUSED_PARAM, char **argv)
+ {
+ 	unsigned opt;
+-	const char *rtcname = NULL;
++	const char *rtcname = "/dev/rtc0";
+ 	const char *suspend = "standby";
+ 	const char *opt_seconds;
+ 	const char *opt_time;