recovery: Blank screen during shutdown and reboot

Some hardware doesn't like having the panel on and still
active during power cycles, so just turn it off.

(based on Ied1f0802f5a2d45980ee33abf2456a291ba64beb)

Change-Id: Ied6bbc3a32fd1c7cf6ea3ec1b2bee298520651c3

5 files changed, 16 insertions, 0 deletions

diff --git a/recovery.cpp b/recovery.cpp
index 7a987d0b..0349da3b 100644
--- a/recovery.cpp
+++ b/recovery.cpp
@@ -1879,6 +1879,8 @@ int main(int argc, char **argv) {
 
   sync();
 
+  ui->Stop();
+
   switch (after) {
     case Device::SHUTDOWN:
       ui->Print("Shutting down...\n");
diff --git a/screen_ui.cpp b/screen_ui.cpp
index c8fb5aa7..9fe6501f 100644
--- a/screen_ui.cpp
+++ b/screen_ui.cpp
@@ -637,6 +637,11 @@ bool ScreenRecoveryUI::Init(const std::string& locale) {
   return true;
 }
 
+void ScreenRecoveryUI::Stop() {
+  RecoveryUI::Stop();
+  gr_fb_blank(true);
+}
+
 void ScreenRecoveryUI::LoadAnimation() {
   std::unique_ptr<DIR, decltype(&closedir)> dir(opendir("/res/images"), closedir);
   dirent* de;
diff --git a/screen_ui.h b/screen_ui.h
index f05761c4..85b2695f 100644
--- a/screen_ui.h
+++ b/screen_ui.h
@@ -46,6 +46,7 @@ class ScreenRecoveryUI : public RecoveryUI {
   ScreenRecoveryUI();
 
   bool Init(const std::string& locale) override;
+  void Stop() override;
 
   // overall recovery state ("background image")
   void SetBackground(Icon icon) override;
diff --git a/ui.cpp b/ui.cpp
index 3930cb78..792e22b4 100644
--- a/ui.cpp
+++ b/ui.cpp
@@ -220,6 +220,12 @@ bool RecoveryUI::Init(const std::string& /* locale */) {
   return true;
 }
 
+void RecoveryUI::Stop() {
+  if (!android::base::WriteStringToFile("0", BRIGHTNESS_FILE)) {
+    PLOG(WARNING) << "Failed to write brightness file";
+  }
+}
+
 void RecoveryUI::OnTouchEvent() {
   Point delta = touch_pos_ - touch_start_;
   enum SwipeDirection { UP, DOWN, RIGHT, LEFT } direction;
diff --git a/ui.h b/ui.h
index 6c06eb09..eced2abe 100644
--- a/ui.h
+++ b/ui.h
@@ -102,6 +102,8 @@ class RecoveryUI {
   // the given locale. Returns true on success.
   virtual bool Init(const std::string& locale);
 
+  virtual void Stop();
+
   // Shows a stage indicator. Called immediately after Init().
   virtual void SetStage(int current, int max) = 0;