Do not do powerhint if current governor is not supported

Bug: 62913269
Test: Boot and verify powerhint works
Change-Id: If2638ae5f107534b46412ca8cce9f02e9eb5d215

power/Android.mk

@@ -44,6 +44,7 @@ LOCAL_SRC_FILES += power-8998.c
 LOCAL_CFLAGS += -DINTERACTION_BOOST -Werror
 
 LOCAL_SHARED_LIBRARIES := \
+    libbase \
     liblog \
     libcutils \
     libdl \

power/Power.cpp

@@ -17,6 +17,8 @@
 #define LOG_TAG "android.hardware.power@1.1-service.wahoo"
 
 #include <android/log.h>
+#include <android-base/file.h>
+#include <android-base/strings.h>
 #include <utils/Log.h>
 #include "Power.h"
 #include "power-common.h"
@@ -49,12 +51,18 @@ Power::Power() {
 
 // Methods from ::android::hardware::power::V1_0::IPower follow.
 Return<void> Power::setInteractive(bool interactive)  {
+    if (!isSupportedGovernor()) {
+        return Void();
+    }
     power_set_interactive(interactive ? 1 : 0);
     return Void();
 }
 
 Return<void> Power::powerHint(PowerHint hint, int32_t data) {
     power_hint_t h = static_cast<power_hint_t>(hint);
+    if (!isSupportedGovernor()) {
+        return Void();
+    }
     if (h == POWER_HINT_INTERACTION) {
         mInteractionHandler.Acquire(data);
         return Void();
@@ -169,6 +177,20 @@ done:
     return Void();
 }
 
+bool Power::isSupportedGovernor() {
+    std::string buf;
+    if (android::base::ReadFileToString(SCALING_GOVERNOR_PATH, &buf)) {
+        buf = android::base::Trim(buf);
+    }
+    // Only support EAS 1.2, legacy EAS and HMP
+    if (buf == SCHEDUTIL_GOVERNOR || buf == SCHED_GOVERNOR || buf == INTERACTIVE_GOVERNOR) {
+        return true;
+    } else {
+        ALOGE("Governor not supported by powerHAL, skipping");
+        return false;
+    }
+}
+
 }  // namespace implementation
 }  // namespace V1_1
 }  // namespace power

power/Power.h

@@ -54,6 +54,7 @@ struct Power : public IPower {
 
  private:
     InteractionHandler mInteractionHandler;
+    static bool isSupportedGovernor();
 };
 
 }  // namespace implementation

power/power-common.h

@@ -36,6 +36,9 @@
 #define SCALING_MIN_FREQ "/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq"
 #define ONDEMAND_GOVERNOR "ondemand"
 #define INTERACTIVE_GOVERNOR "interactive"
+#define SCHEDUTIL_GOVERNOR "schedutil"
+#define SCHED_GOVERNOR "sched"
+
 #define MSMDCVS_GOVERNOR "msm-dcvs"
 #define SCHED_GOVERNOR "sched"