init: add detection of charging mode

-when BOARD_CHARGING_MODE_BOOTING_LPM is set to a path_to_sysfs_attribute
 then it and lpm.rc will be read accordingly.

-adapted from techomancer's original change:
 (add detection of charging mode, remove the code for parsing param.lfs,
  since it is not needed)
 http://goo.gl/I19GG

Change-Id: I64c2379225e00afaaf17ee03eab67546781668f8

2 files changed, 32 insertions, 1 deletions

diff --git a/init/Android.mk b/init/Android.mk
index 7dae9df8..0e2291ef 100644
--- a/init/Android.mk
+++ b/init/Android.mk
@@ -26,6 +26,14 @@ ifneq (,$(filter userdebug eng,$(TARGET_BUILD_VARIANT)))
 LOCAL_CFLAGS += -DALLOW_LOCAL_PROP_OVERRIDE=1
 endif
 
+SYSTEM_CORE_INIT_DEFINES := BOARD_CHARGING_MODE_BOOTING_LPM
+
+$(foreach system_core_init_define,$(SYSTEM_CORE_INIT_DEFINES), \
+  $(if $($(system_core_init_define)), \
+    $(eval LOCAL_CFLAGS += -D$(system_core_init_define)=\"$($(system_core_init_define))\") \
+  ) \
+  )
+
 LOCAL_MODULE:= init
 
 LOCAL_FORCE_STATIC_EXECUTABLE := true
diff --git a/init/init.c b/init/init.c
index 2b273e88..576d305c 100755
--- a/init/init.c
+++ b/init/init.c
@@ -855,6 +855,25 @@ void selinux_load_policy(void)
 }
 #endif
 
+static int charging_mode_booting(void)
+{
+#ifndef BOARD_CHARGING_MODE_BOOTING_LPM
+	return 0;
+#else
+	int f;
+	char cmb;
+	f = open(BOARD_CHARGING_MODE_BOOTING_LPM, O_RDONLY);
+	if (f < 0)
+		return 0;
+
+	if (1 != read(f, (void *)&cmb,1))
+		return 0;
+
+	close(f);
+	return ('1' == cmb);
+#endif
+}
+
 int main(int argc, char **argv)
 {
     int fd_count = 0;
@@ -917,7 +936,11 @@ int main(int argc, char **argv)
         property_load_boot_defaults();
 
     INFO("reading config file\n");
-    init_parse_config_file("/init.rc");
+
+    if (!charging_mode_booting())
+       init_parse_config_file("/init.rc");
+    else
+       init_parse_config_file("/lpm.rc");
 
     /* Check for a target specific initialisation file and read if present */
     if (access("/init.target.rc", R_OK) == 0) {