commit 0940e414e2604320320c7f1bc6c5ae4d56f385c6
author Ethan Chen <intervigil@gmail.com> Tue Oct 22 13:48:50 2013 -0700
committer Gerrit Code Review <gerrit2@gerrit> Mon Feb 03 19:12:14 2014 +0100
tree 954b6440e7a0e7bfbdd18fb3b695169f42f67c7c
parent c7360dd26343b704350b7bc0911221c56ecf4695

minui: Allow devices to blank/unblank using LCD backlight

* Some devices rely on the LCD backlight to blank/unblank the display,
  support them by allowing a custom LCD backlight path to be used.

Change-Id: I8406b4b55cd7a2afc4f8f8ba65de2c53b949489d

minui/Android.mk

diff --git a/minui/Android.mk b/minui/Android.mk
index 9bda6dd..d889587 100644
--- a/minui/Android.mk
+++ b/minui/Android.mk
@@ -31,4 +31,8 @@
   LOCAL_CFLAGS += -DOVERSCAN_PERCENT=0
 endif
 
+ifneq ($(TARGET_RECOVERY_LCD_BACKLIGHT_PATH),)
+  LOCAL_CFLAGS += -DRECOVERY_LCD_BACKLIGHT_PATH=$(TARGET_RECOVERY_LCD_BACKLIGHT_PATH)
+endif
+
 include $(BUILD_STATIC_LIBRARY)

minui/graphics.c

diff --git a/minui/graphics.c b/minui/graphics.c
index 8998d9f..ff39674 100644
--- a/minui/graphics.c
+++ b/minui/graphics.c
@@ -437,9 +437,21 @@
 
 void gr_fb_blank(bool blank)
 {
+#ifdef RECOVERY_LCD_BACKLIGHT_PATH
+    int fd;
+
+    fd = open(RECOVERY_LCD_BACKLIGHT_PATH, O_RDWR);
+    if (fd < 0) {
+        perror("cannot open LCD backlight");
+        return;
+    }
+    write(fd, blank ? "000" : "127", 3);
+    close(fd);
+#else
     int ret;
 
     ret = ioctl(gr_fb_fd, FBIOBLANK, blank ? FB_BLANK_POWERDOWN : FB_BLANK_UNBLANK);
     if (ret < 0)
         perror("ioctl(): blank");
+#endif
 }