healthd: Remove libhealthd dependency from charger

Clean up charger's libhealthd dependency.

- Charger uses libhealthloop to maintain an infinite
  loop, similar to all health 2.x services.
- Charger tries to open up health 2.1 HAL implementation
  to retrieve health info. If it failed, it falls back
  to the legacy code path where a default BatteryMonitor
  is used, *except* that it won't depend on libhealthd's
  healthd_board_init() and healthd_board_battery_update()
  anymore.
- Remove global static variables because they are hard to
  track.
- Modernize code by converting charger_state in to a C++
  Charger class, transforming all functions into methods,
  and moving all other global states into the class.

- Devices that matches all of the following:
  - have a customized libhealthd (search for modules
    named libhealthd.xxxx)
  - uses charger from system image (look for "class charger"
    in device init.rc scripts; if you see the binary is named
    "/charger" or "/system/bin/charger" then you are using
    charger from system image)
  ... must implement health 2.1 passthrough implementation
  properly in order to have charger continue to work.

See hardware/interfaces/health/2.1/README.md for details.

Test: charger test
Test: manual charger mode
Bug: 127677771
Bug: 142286265

Change-Id: I0f26e5c1fe2be6b5952fc019224457c8419e43e4
diff --git a/healthd/Android.bp b/healthd/Android.bp
index e04f70f..14d46b3 100644
--- a/healthd/Android.bp
+++ b/healthd/Android.bp
@@ -89,6 +89,7 @@
 
 cc_library_static {
     name: "libhealthd_charger_nops",
+    recovery_available: true,
 
     srcs: [
         "healthd_mode_charger_nops.cpp",
@@ -104,17 +105,19 @@
     ],
 
     static_libs: [
-        "android.hardware.health@2.0-impl",
+        "libhealthloop",
+        "libhealth2impl",
     ],
 
     shared_libs: [
-        "android.hardware.health@2.0",
+        "android.hardware.health@2.1",
         "libutils",
     ],
 }
 
 sysprop_library {
     name: "charger_sysprop",
+    recovery_available: true,
     srcs: ["charger.sysprop"],
     property_owner: "Platform",
     api_packages: ["android.sysprop"],
@@ -141,16 +144,16 @@
     export_include_dirs: [".", "include"],
 
     static_libs: [
-        "android.hardware.health@2.0-impl",
         "android.hardware.health@1.0-convert",
         "libcharger_sysprop",
-        "libhealthstoragedefault",
         "libhealthd_draw",
+        "libhealthloop",
+        "libhealth2impl",
         "libminui",
     ],
 
     shared_libs: [
-        "android.hardware.health@2.0",
+        "android.hardware.health@2.1",
         "libbase",
         "libcutils",
         "liblog",
@@ -164,3 +167,76 @@
         "AnimationParser.cpp",
     ],
 }
+
+cc_defaults {
+    name: "charger_defaults",
+
+    cflags: [
+        "-Wall",
+        "-Werror",
+    ],
+
+    shared_libs: [
+        // common
+        "android.hardware.health@2.0",
+        "android.hardware.health@2.1",
+        "libbase",
+        "libcutils",
+        "libhidlbase",
+        "liblog",
+        "libutils",
+
+        // system charger only
+        "libpng",
+    ],
+
+    static_libs: [
+        // common
+        "android.hardware.health@1.0-convert",
+        "libbatterymonitor",
+        "libcharger_sysprop",
+        "libhealthd_charger_nops",
+        "libhealthloop",
+        "libhealth2impl",
+
+        // system charger only
+        "libhealthd_draw",
+        "libhealthd_charger",
+        "libminui",
+        "libsuspend",
+    ],
+}
+
+cc_binary {
+    name: "charger",
+    defaults: ["charger_defaults"],
+    recovery_available: true,
+    srcs: [
+        "charger.cpp",
+        "charger_utils.cpp",
+    ],
+
+    target: {
+        recovery: {
+            // No UI and libsuspend for recovery charger.
+            cflags: [
+                "-DCHARGER_FORCE_NO_UI=1",
+            ],
+            exclude_shared_libs: [
+                "libpng",
+            ],
+            exclude_static_libs: [
+                "libhealthd_draw",
+                "libhealthd_charger",
+                "libminui",
+                "libsuspend",
+            ],
+        }
+    }
+}
+
+cc_test {
+    name: "charger_test",
+    defaults: ["charger_defaults"],
+    srcs: ["charger_test.cpp"],
+}