Permits power state and battery life diagnosis.
Feature activated by CONFIG_RTC_SHOW_TIME.
Signed-off-by: Mark Salyzyn <salyzyn@xxxxxxxxxxx>
v2:
- react to implementation move to kernel timekeeping from rtc_lib
- use late_initcall to ensure rtc_lib driver(s) are loaded
---
kernel/time/rtc_show_time.c | 59 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 59 insertions(+)
diff --git a/kernel/time/rtc_show_time.c b/kernel/time/rtc_show_time.c
index bbf4f92abf4f..d52e2a76cd00 100644
--- a/kernel/time/rtc_show_time.c
+++ b/kernel/time/rtc_show_time.c
@@ -6,6 +6,8 @@
* published by the Free Software Foundation.
*/
+#include <linux/kdebug.h>
+#include <linux/reboot.h>
#include <linux/rtc.h>
void rtc_show_time(const char *prefix_msg)
@@ -21,3 +23,60 @@ void rtc_show_time(const char *prefix_msg)
tm.tm_hour, tm.tm_min, tm.tm_sec, ts.tv_nsec);
}
EXPORT_SYMBOL(rtc_show_time);
+
+static int rtc_show_time_die_notify(struct notifier_block *self,
+ unsigned long event, void *data)
+{
+ if (event != DIE_OOPS)
+ return NOTIFY_DONE;
+ rtc_show_time("Oops");
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block rtc_show_time_die_nb = {
+ .notifier_call = rtc_show_time_die_notify,
+ .priority = 0,
+};
+
+static int rtc_show_time_reboot_notify(struct notifier_block *self,
+ unsigned long event, void *data)
+{
+ const char *txt;
+
+ switch (event) {
+ case SYS_RESTART:
+ txt = "Restart";
+ break;
+ case SYS_HALT:
+ txt = "Halt";
+ break;
+ case SYS_POWER_OFF:
+ txt = "Power-Off";
+ break;
+ default:
+ return NOTIFY_DONE;
+ }
+ rtc_show_time(txt);
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block rtc_show_time_reboot_nb = {
+ .notifier_call = rtc_show_time_reboot_notify,
+ .priority = 0,
+};
+
+static __init int init_rtc_show_time(void)
+{
+ int ret;
+
+ ret = register_die_notifier(&rtc_show_time_die_nb);
+ if (ret)
+ pr_warn("Failed to register rtc_show_time die notifier\n");
+ ret = register_reboot_notifier(&rtc_show_time_reboot_nb);
+ if (ret)
+ pr_warn("Failed to register rtc_show_time reboot notifier\n");
+
+ return ret;
+}
+/* rtc driver needs to be loaded before this is truly functional */
+late_initcall(init_rtc_show_time);
--
2.13.2.932.g7449e964c-goog
