[power-udev] Expect POWER_SUPPLY_REAL_TYPE udev property. JB#38667

On devices like Xperia 10 statefs fails to report charger type which
then leads to issues situations where one needs to differentiate
between for example wall chargers and other kinds of chargers. This
happens due to kernel/udev reporting two device type properties:
  POWER_SUPPLY_TYPE=USB_PD
  POWER_SUPPLY_REAL_TYPE=USB_HVDCP
of which REAL_TYPE has the content statefs expects to see in TYPE.

When POWER_SUPPLY_REAL_TYPE property is defined, use it instead of
POWER_SUPPLY_TYPE.

Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

src/power_udev/provider_power_udev.cpp

@@ -4,7 +4,9 @@
  *
  * Uses udev as source
  *
- * @copyright (C) 2015 Jolla Ltd.
+ * Copyright (C) 2015-2019 Jolla Ltd.
+ * Copyright (c) 2019 Open Mobile Platform LLC.
+ *
  * @par License: LGPL 2.1 http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
  */
 
@@ -447,7 +449,7 @@ class BatteryInfo
 struct ChargerInfo
 {
     ChargerInfo(udevpp::Device const &dev)
-        : type(charger_type(attr(dev.attr("type"))))
+        : type(charger_type(attr(dev.attr("real_type") ?: dev.attr("type"))))
         , state([&dev]() {
                 auto v = attr(dev.attr("online"), -13);
                 return (v == 0
@@ -1306,7 +1308,7 @@ void Monitor::after_enumeration()
 
 void Monitor::on_device(udevpp::Device &&dev)
 {
-    auto t = attr(dev.attr("type"));
+    auto t = attr(dev.attr("real_type") ?: dev.attr("type"));
     if (t == "Battery") {
         // TODO there can be several batteries including also backup battery
         battery_.update(std::move(dev));