Fix for GPIO pulsating on repeated Activate calls

The problem is when "out" is written to the direction file in the sysfs,
the Linux kernel will overwrite the current value of the GPIO
and set it low. Legato will then continue to set the GPIO high.
The net result is that there is a very brief low pulse on the GPIO if
it is already set as an output, and is set high.
The fix is to skip writing the direction to the file, if the direction
is already correct.

Resolves: LE-13244
Change-Id: If408e5af608bcc255c76a07d2bcc232a383f42a2

components/sysfsGpio/gpioSysfsUtils.c

@@ -394,13 +394,21 @@ static le_result_t SetDirection
 {
     char path[64];
     const char *attr;
+    gpioSysfs_PinMode_t currentMode;
 
     if ((!gpioRef) || (gpioRef->pinNum == 0))
     {
         LE_ERROR("gpioRef is NULL or object not initialized");
         return LE_BAD_PARAMETER;
     }
 
+    currentMode = (gpioSysfs_IsInput(gpioRef)) ? SYSFS_PIN_MODE_INPUT : SYSFS_PIN_MODE_OUTPUT;
+    if (currentMode == mode)
+    {
+        // Direction is already correct, don't do anything.
+        return LE_OK;
+    }
+
     snprintf(path, sizeof(path), "%s/%s%s/%s", SYSFS_GPIO_PATH, GpioAliasesPath,
             gpioRef->gpioName, "direction");
     attr = (mode == SYSFS_PIN_MODE_OUTPUT) ? "out": "in";