From c6a9d5fa38c7560d3b9f9d08a43458faf555e29b Mon Sep 17 00:00:00 2001
From: Deevana Murthy Bandaru <dbandaru@codeaurora.org>
Date: Mon, 23 Jul 2018 15:11:37 +0530
Subject: power: Turn on/off display in SDM439

PowerHAL writes to a sysfs node when it gets display on/off
notification.

Change-Id: I90acbef41cc01d7712cbb23765f3d278cb3ee637
---
 power-8952.c | 47 +++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 45 insertions(+), 2 deletions(-)

diff --git a/power-8952.c b/power-8952.c
index 8a87c27..9e9765a 100644
--- a/power-8952.c
+++ b/power-8952.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2015,2018 The Linux Foundation. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
@@ -36,6 +36,7 @@
 #include <fcntl.h>
 #include <dlfcn.h>
 #include <stdlib.h>
+#include <unistd.h>
 
 #define LOG_TAG "QTI PowerHAL"
 #include <utils/Log.h>
@@ -53,6 +54,8 @@ static int display_hint_sent;
 static int video_encode_hint_sent;
 
 static void process_video_encode_hint(void *metadata);
+static int display_fd;
+#define SYS_DISPLAY_PWR "/sys/kernel/hbtp/display_pwr"
 
 int  power_hint_override(struct power_module *module, power_hint_t hint,
         void *data)
@@ -75,7 +78,13 @@ int  set_interactive_override(struct power_module *module, int on)
     char governor[80];
     char tmp_str[NODE_MAX];
     struct video_encode_metadata_t video_encode_metadata;
-    int rc;
+    int rc = 0;
+
+    static const char *display_on = "1";
+    static const char *display_off = "0";
+    char err_buf[80];
+    static int init_interactive_hint = 0;
+    static int set_i_count = 0;
 
     ALOGI("Got set_interactive hint");
 
@@ -115,6 +124,40 @@ int  set_interactive_override(struct power_module *module, int on)
           }
    }
     saved_interactive_mode = !!on;
+
+    set_i_count ++;
+    ALOGI("Got set_interactive hint on= %d, count= %d\n", on, set_i_count);
+
+    if (init_interactive_hint == 0)
+    {
+        //First time the display is turned off
+        display_fd = TEMP_FAILURE_RETRY(open(SYS_DISPLAY_PWR, O_RDWR));
+        if (display_fd < 0) {
+            strerror_r(errno,err_buf,sizeof(err_buf));
+            ALOGE("Error opening %s: %s\n", SYS_DISPLAY_PWR, err_buf);
+            return HINT_HANDLED;
+        }
+        else
+            init_interactive_hint = 1;
+    }
+    else
+        if (!on ) {
+            /* Display off. */
+            rc = TEMP_FAILURE_RETRY(write(display_fd, display_off, strlen(display_off)));
+            if (rc < 0) {
+                strerror_r(errno,err_buf,sizeof(err_buf));
+                ALOGE("Error writing %s to  %s: %s\n", display_off, SYS_DISPLAY_PWR, err_buf);
+            }
+        }
+        else {
+            /* Display on */
+            rc = TEMP_FAILURE_RETRY(write(display_fd, display_on, strlen(display_on)));
+            if (rc < 0) {
+                strerror_r(errno,err_buf,sizeof(err_buf));
+                ALOGE("Error writing %s to  %s: %s\n", display_on, SYS_DISPLAY_PWR, err_buf);
+            }
+        }
+
     return HINT_HANDLED;
 }
 
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