Support doing battery cut-off in firmware stage.

Add a new crossystem value "battery_cutoff_request" to indicate that
next reboot should cut-off battery and shutdown during firmware stage.

This request is primarily for factories to ship devices in an safe
state. Previously we have done same thing by running "ectool battery-cutoff"
but that creates a problem which "ectool" (and the one to request for
cut-off) must live in developer mode while  the device must be shipped
in normal mode. The mode transition was solved by setting
"disable_dev_request=1", but that flag is may get lost on x86 systems
(having NV storage in CMOS) when the battery is cut-off .

From the experience from Ryu, such settings (dev mode transition and
battery cut-off) should be done together inside firmware execution so we
can create a new flag, battery_cutoff_request, to finalize device
properly.

BRANCH=none
BUG=chromium:601705
TEST=emerge-chell depthcharge vboot_reference chromeos-bootimage
     crossystem battery_cutoff_request=1
     # Unplug AC adapter
     reboot
     # See device rebooted and then shutdown immediately.
     # Press power button and system won't boot.
     # Attach AC adapter and now system boots.
CQ-DEPEND=CL:337596,CL:338193

Change-Id: I73ccae15b337cd65786106646546c67c155b8fa6
Reviewed-on: https://chromium-review.googlesource.com/337602
Commit-Ready: Hung-Te Lin <hungte@chromium.org>
Tested-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/host/lib/crossystem.c b/host/lib/crossystem.c
index bcbf4dd4..7c51927e 100644
--- a/host/lib/crossystem.c
+++ b/host/lib/crossystem.c
@@ -551,6 +551,8 @@ int VbGetSystemPropertyInt(const char* name) {
 	  value = VbGetNvStorage(VBNV_BOOT_ON_AC_DETECT);
   } else if (!strcasecmp(name, "try_ro_sync")) {
 	  value = VbGetNvStorage(VBNV_TRY_RO_SYNC);
+  } else if (!strcasecmp(name, "battery_cutoff_request")) {
+    value = VbGetNvStorage(VBNV_BATTERY_CUTOFF_REQUEST);
   }
 
   return value;
@@ -687,6 +689,8 @@ int VbSetSystemPropertyInt(const char* name, int value) {
     return VbSetNvStorage_WithBackup(VBNV_BOOT_ON_AC_DETECT, value);
   } else if (!strcasecmp(name, "try_ro_sync")) {
     return VbSetNvStorage_WithBackup(VBNV_TRY_RO_SYNC, value);
+  } else if (!strcasecmp(name, "battery_cutoff_request")) {
+    return VbSetNvStorage(VBNV_BATTERY_CUTOFF_REQUEST, value);
   }
 
   return -1;