sm7125-common: sensors: Toggle touchscreen on/off if needed

* Due to config_powerDecoupleInteractiveModeFromDisplay we need to wait for the sensors sub HAL to re-start every time we fail a fingerprint unlock with screen off or on AOD.
* To prevent killing said overlay and having the touchscreen constantly enabled on AOD, we simply toggle the touchscreen on/off with every screen-off-UDFPS unlock

Change-Id: I819b9ef4387a914ccf17d7f4c6023ad08b3d14a0

sensors/Sensor.cpp

@@ -20,8 +20,26 @@
 #include <log/log.h>
 #include <utils/SystemClock.h>
 
+#include <fstream>
+
 #include <cmath>
 
+#define TSP_ENABLED_PATH "/sys/class/sec/tsp/input/enabled"
+
+template <typename T>
+static void set(const std::string& path, const T& value) {
+    std::ofstream file(path);
+    file << value;
+}
+
+template <typename T>
+static T get(const std::string& path, const T& def) {
+    std::ifstream file(path);
+    T result;
+    file >> result;
+    return file.fail() ? def : result;
+}
+
 static bool readBool(int fd, bool seek) {
     char c;
     int rc;
@@ -262,6 +280,10 @@ SysfsPollingOneShotSensor::~SysfsPollingOneShotSensor() {
 void SysfsPollingOneShotSensor::activate(bool enable, bool notify, bool lock) {
     std::unique_lock<std::mutex> runLock(mRunMutex, std::defer_lock);
 
+    if (!enable && strcmp(get<std::string>(TSP_ENABLED_PATH, "0").c_str(), "0") == 0) {
+        set(TSP_ENABLED_PATH, "1");
+    }
+
     if (lock) {
         runLock.lock();
     }
@@ -278,6 +300,10 @@ void SysfsPollingOneShotSensor::activate(bool enable, bool notify, bool lock) {
     if (lock) {
         runLock.unlock();
     }
+
+    if (enable && strcmp(get<std::string>(TSP_ENABLED_PATH, "0").c_str(), "1") == 0) {
+        set(TSP_ENABLED_PATH, "0");
+    }
 }
 
 void SysfsPollingOneShotSensor::activate(bool enable) {
@@ -310,6 +336,9 @@ void SysfsPollingOneShotSensor::run() {
             }
 
             if (mPolls[1].revents == mPolls[1].events && readBool(mPollFd, true /* seek */)) {
+                if (strcmp(get<std::string>(TSP_ENABLED_PATH, "0").c_str(), "0") == 0) {
+                    set(TSP_ENABLED_PATH, "1");
+                }
                 activate(false, false, false);
                 mCallback->postEvents(readEvents(), isWakeUpSensor());
             } else if (mPolls[0].revents == mPolls[0].events) {

sepolicy/vendor/hal_sensors_default.te

@@ -37,7 +37,7 @@ allow hal_sensors_default sysfs_sec_touchscreen:dir r_dir_perms;
 allow hal_sensors_default sysfs_sec_touchscreen:file r_file_perms;
 allow hal_sensors_default sysfs_sec_touchscreen:lnk_file r_file_perms;
 allow hal_sensors_default sysfs_power_writable:dir search;
-allow hal_sensors_default sysfs_power_writable:file { read open };
+allow hal_sensors_default sysfs_power_writable:file rw_file_perms;
 
 # /sys/class/sec/tsp/cmd
 allow hal_sensors_default sysfs_touchscreen_writable:file rw_file_perms;