From be94045ad9e58acff4ca3d0029833ee7208b31cb Mon Sep 17 00:00:00 2001
From: AbhiShek Aggarwal <warabhishek@gmail.com>
Date: Wed, 30 Jan 2019 20:51:44 +0000
Subject: [PATCH] sm6250-common: Add support for event-based tap to wake
 gesture control

Change-Id: Id963e3c7302a7ee46a5a6b6d1b743a5718d71f4c
---
 power-libperfmgr/Android.bp                   |  4 ++++
 power-libperfmgr/Power.cpp                    | 21 +++++++++++++++++--
 ...er@1.3-service.xiaomi_sm6250-libperfmgr.rc |  2 +-
 sepolicy/vendor/hal_power_default.te          |  3 +++
 4 files changed, 27 insertions(+), 3 deletions(-)
 create mode 100644 sepolicy/vendor/hal_power_default.te

diff --git a/power-libperfmgr/Android.bp b/power-libperfmgr/Android.bp
index a0763a5..60553d6 100644
--- a/power-libperfmgr/Android.bp
+++ b/power-libperfmgr/Android.bp
@@ -41,6 +41,10 @@ cc_binary {
         "android.hardware.power@1.2",
         "android.hardware.power@1.3",
         "libperfmgr",
+    ],
+	header_libs: [
+        "libhardware_headers",
+        "generated_kernel_headers",
     ],
     proprietary: true,
 }
diff --git a/power-libperfmgr/Power.cpp b/power-libperfmgr/Power.cpp
index 3e35c69..300c557 100644
--- a/power-libperfmgr/Power.cpp
+++ b/power-libperfmgr/Power.cpp
@@ -28,6 +28,11 @@
 #include <utils/Trace.h>
 
 #include "Power.h"
+#include <linux/input.h>
+
+constexpr char kWakeupEventNode[] = "/dev/input/event2";
+constexpr int kWakeupModeOff = 4;
+constexpr int kWakeupModeOn = 5;
 
 namespace android {
 namespace hardware {
@@ -136,8 +141,20 @@ Return<void> Power::powerHint(PowerHint_1_0 hint, int32_t data) {
     return Void();
 }
 
-Return<void> Power::setFeature(Feature /*feature*/, bool /*activate*/) {
-    // Nothing to do
+Return<void> Power::setFeature(Feature feature, bool activate) {
+    switch (feature) {
+        case Feature::POWER_FEATURE_DOUBLE_TAP_TO_WAKE: {
+            int fd = open(kWakeupEventNode, O_RDWR);
+            struct input_event ev;
+            ev.type = EV_SYN;
+            ev.code = SYN_CONFIG;
+            ev.value = activate ? kWakeupModeOn : kWakeupModeOff;
+            write(fd, &ev, sizeof(ev));
+            close(fd);
+            } break;
+        default:
+            break;
+    }
     return Void();
 }
 
diff --git a/power-libperfmgr/android.hardware.power@1.3-service.xiaomi_sm6250-libperfmgr.rc b/power-libperfmgr/android.hardware.power@1.3-service.xiaomi_sm6250-libperfmgr.rc
index 7b58e8c..a5d4f1d 100644
--- a/power-libperfmgr/android.hardware.power@1.3-service.xiaomi_sm6250-libperfmgr.rc
+++ b/power-libperfmgr/android.hardware.power@1.3-service.xiaomi_sm6250-libperfmgr.rc
@@ -1,7 +1,7 @@
 service vendor.power-hal-1-3 /vendor/bin/hw/android.hardware.power@1.3-service.xiaomi_sm6250-libperfmgr
     class hal
     user root
-    group system
+    group system input
     priority -20
     interface android.hardware.power@1.0::IPower default
     interface android.hardware.power@1.1::IPower default
diff --git a/sepolicy/vendor/hal_power_default.te b/sepolicy/vendor/hal_power_default.te
new file mode 100644
index 0000000..da39c42
--- /dev/null
+++ b/sepolicy/vendor/hal_power_default.te
@@ -0,0 +1,3 @@
+# Allow hal_power_default to write to dt2w nodes
+allow hal_power_default input_device:dir search;
+allow hal_power_default input_device:chr_file rw_file_perms;