Revert "sm6250-common: power-libperfmgr: remove Google-specific display LPM control"

This reverts commit 0d73bffba1c8ce97ce466976f0ad8e42e11ba4f5.

Signed-off-by: Volodymyr Zhdanov <wight554@gmail.com>

 Conflicts:
	power-libperfmgr/Power.cpp

power-libperfmgr/Android.bp

@@ -24,7 +24,8 @@ cc_binary {
     relative_install_path: "hw",
     vintf_fragments: ["android.hardware.power@1.3-service.xiaomi_sm6250.xml"],
     init_rc: ["android.hardware.power@1.3-service.xiaomi_sm6250-libperfmgr.rc"],
-    srcs: ["service.cpp", "Power.cpp", "InteractionHandler.cpp"],
+    srcs: ["service.cpp", "Power.cpp", "InteractionHandler.cpp",
+            "display-helper.cpp"],
     cflags: [
         "-Wall",
         "-Werror",

power-libperfmgr/Power.cpp

@@ -27,6 +27,8 @@
 #include <utils/Trace.h>
 
 #include "Power.h"
+#include "display-helper.h"
+
 #include <linux/input.h>
 
 constexpr int kWakeupModeOff = 4;
@@ -131,6 +133,13 @@ Return<void> Power::powerHint(PowerHint_1_0 hint, int32_t data) {
             }
             break;
         case PowerHint_1_0::LOW_POWER:
+            if (data) {
+                // Device in battery saver mode, enable display low power mode
+                set_display_lpm(true);
+            } else {
+                // Device exiting battery saver mode, disable display low power mode
+                set_display_lpm(false);
+            }
             break;
         default:
             break;

power-libperfmgr/display-helper.cpp

@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_NIDEBUG 0
+#define LOG_TAG "android.hardware.power@1.3-service.xiaomi_sm6250-libperfmgr"
+
+#include <dlfcn.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <cutils/sockets.h>
+#include <log/log.h>
+
+#include "display-helper.h"
+
+#define DAEMON_SOCKET "pps"
+
+static int daemon_socket = -1;
+
+static int connectPPDaemon() {
+    // Setup socket connection, if not already done.
+    if (daemon_socket < 0)
+        daemon_socket =
+                socket_local_client(DAEMON_SOCKET, ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_STREAM);
+
+    if (daemon_socket < 0) {
+        ALOGE("Connecting to socket failed: %s", strerror(errno));
+        return -1;
+    }
+    return 0;
+}
+
+static int ppdComm(const char *cmd) {
+    int ret = -1;
+
+    ret = connectPPDaemon();
+    if (ret < 0)
+        return ret;
+
+    ret = write(daemon_socket, cmd, strlen(cmd));
+    if (ret < 0) {
+        ALOGE("Failed to send data over socket, %s", strerror(errno));
+        return ret;
+    }
+    return 0;
+}
+
+void set_display_lpm(int enable) {
+    ALOGI("set_display_lpm state: %d", enable);
+    if (enable) {
+        ppdComm("foss:on");
+    } else {
+        ppdComm("foss:off");
+    }
+}

power-libperfmgr/display-helper.h

@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef POWER_LIBPERFMGR_DISPLAY_HELPER_H_
+#define POWER_LIBPERFMGR_DISPLAY_HELPER_H_
+
+enum display_lpm_state {
+    DISPLAY_LPM_OFF = 0,
+    DISPLAY_LPM_ON,
+    DISPLAY_LPM_UNKNOWN,
+};
+
+void set_display_lpm(int enable);
+
+#endif  // POWER_LIBPERFMGR_DISPLAY_HELPER_H_