From 00028b4adbe1475fe799a7cec148b37182ac5e9f Mon Sep 17 00:00:00 2001
From: Ethan Yonker <dees_troy@teamw.in>
Date: Wed, 9 Apr 2014 14:29:02 -0500
Subject: Add find file class to search for files

Scan a folder for a file based on file name. First scan the files
in the current path, then search real directories and finally
search symlinks in that order. Goal is to locate important sysfs
files for things like brightness, battery capacity, lun files, etc

This implementation just scans for the brightness file for the LCD

Change-Id: I8ed3e74a2e2851d58b443718b6e92b50a5491f08
---
 data.cpp | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

(limited to 'data.cpp')

diff --git a/data.cpp b/data.cpp
index c9628a411..1fbe0ffad 100644
--- a/data.cpp
+++ b/data.cpp
@@ -45,6 +45,7 @@
 #ifndef TW_NO_SCREEN_TIMEOUT
 #include "gui/blanktimer.hpp"
 #endif
+#include "find_file.hpp"
 
 #ifdef TW_USE_MODEL_HARDWARE_ID_FOR_DEVICE_ID
 	#include "cutils/properties.h"
@@ -940,17 +941,31 @@ void DataManager::SetDefaultValues()
 #ifndef TW_MAX_BRIGHTNESS
 #define TW_MAX_BRIGHTNESS 255
 #endif
+	string findbright;
 	if (strcmp(EXPAND(TW_BRIGHTNESS_PATH), "/nobrightness") != 0) {
-		LOGINFO("TW_BRIGHTNESS_PATH := %s\n", EXPAND(TW_BRIGHTNESS_PATH));
+		findbright = EXPAND(TW_BRIGHTNESS_PATH);
+		LOGINFO("TW_BRIGHTNESS_PATH := %s\n", findbright.c_str());
+		if (!TWFunc::Path_Exists(findbright)) {
+			LOGINFO("Specified brightness file '%s' not found.\n", findbright.c_str());
+			findbright = "";
+		}
+	}
+	if (findbright.empty()) {
+		// Attempt to locate the brightness file
+		findbright = Find_File::Find("brightness", "/sys/class/backlight");
+	}
+	if (findbright.empty()) {
+		LOGINFO("Unable to locate brightness file\n");
+		mConstValues.insert(make_pair("tw_has_brightnesss_file", "0"));
+	} else {
+		LOGINFO("Found brightness file at '%s'\n", findbright.c_str());
 		mConstValues.insert(make_pair("tw_has_brightnesss_file", "1"));
-		mConstValues.insert(make_pair("tw_brightness_file", EXPAND(TW_BRIGHTNESS_PATH)));
+		mConstValues.insert(make_pair("tw_brightness_file", findbright));
 		ostringstream maxVal;
 		maxVal << TW_MAX_BRIGHTNESS;
 		mConstValues.insert(make_pair("tw_brightness_max", maxVal.str()));
 		mValues.insert(make_pair("tw_brightness", make_pair(maxVal.str(), 1)));
 		mValues.insert(make_pair("tw_brightness_pct", make_pair("100", 1)));
-	} else {
-		mConstValues.insert(make_pair("tw_has_brightnesss_file", "0"));
 	}
 #endif
 	mValues.insert(make_pair(TW_MILITARY_TIME, make_pair("0", 1)));
-- 
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