diff --git a/README.md b/README.md
index fb5a9ccfc..5b5f09f4f 100755
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 yuzu emulator early access
 =============
 
-This is the source code for early-access 1378.
+This is the source code for early-access 1379.
 
 ## Legal Notice
 
diff --git a/src/core/hle/service/ptm/psm.cpp b/src/core/hle/service/ptm/psm.cpp
index b4b0dd241..a7cfccda3 100755
--- a/src/core/hle/service/ptm/psm.cpp
+++ b/src/core/hle/service/ptm/psm.cpp
@@ -5,13 +5,116 @@
 #include <memory>
 
 #include "common/logging/log.h"
+#include "core/core.h"
 #include "core/hle/ipc_helpers.h"
+#include "core/hle/kernel/kernel.h"
+#include "core/hle/kernel/readable_event.h"
+#include "core/hle/kernel/writable_event.h"
 #include "core/hle/service/ptm/psm.h"
 #include "core/hle/service/service.h"
 #include "core/hle/service/sm/sm.h"
 
 namespace Service::PSM {
 
+class IPsmSession final : public ServiceFramework<IPsmSession> {
+public:
+    explicit IPsmSession(Core::System& system_) : ServiceFramework{system_, "IPsmSession"} {
+        // clang-format off
+        static const FunctionInfo functions[] = {
+            {0, &IPsmSession::BindStateChangeEvent, "BindStateChangeEvent"},
+            {1, &IPsmSession::UnbindStateChangeEvent, "UnbindStateChangeEvent"},
+            {2, &IPsmSession::SetChargerTypeChangeEventEnabled, "SetChargerTypeChangeEventEnabled"},
+            {3, &IPsmSession::SetPowerSupplyChangeEventEnabled, "SetPowerSupplyChangeEventEnabled"},
+            {4, &IPsmSession::SetBatteryVoltageStateChangeEventEnabled, "SetBatteryVoltageStateChangeEventEnabled"},
+        };
+        // clang-format on
+
+        RegisterHandlers(functions);
+
+        state_change_event = Kernel::WritableEvent::CreateEventPair(
+            system_.Kernel(), "IPsmSession::state_change_event");
+    }
+
+    ~IPsmSession() override = default;
+
+    void SignalChargerTypeChanged() {
+        if (should_signal && should_signal_charger_type) {
+            state_change_event.writable->Signal();
+        }
+    }
+
+    void SignalPowerSupplyChanged() {
+        if (should_signal && should_signal_power_supply) {
+            state_change_event.writable->Signal();
+        }
+    }
+
+    void SignalBatteryVoltageStateChanged() {
+        if (should_signal && should_signal_battery_voltage) {
+            state_change_event.writable->Signal();
+        }
+    }
+
+private:
+    void BindStateChangeEvent(Kernel::HLERequestContext& ctx) {
+        LOG_DEBUG(Service_PSM, "called");
+
+        should_signal = true;
+
+        IPC::ResponseBuilder rb{ctx, 2, 1};
+        rb.Push(RESULT_SUCCESS);
+        rb.PushCopyObjects(state_change_event.readable);
+    }
+
+    void UnbindStateChangeEvent(Kernel::HLERequestContext& ctx) {
+        LOG_DEBUG(Service_PSM, "called");
+
+        should_signal = false;
+
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(RESULT_SUCCESS);
+    }
+
+    void SetChargerTypeChangeEventEnabled(Kernel::HLERequestContext& ctx) {
+        IPC::RequestParser rp{ctx};
+        const auto state = rp.Pop<bool>();
+        LOG_DEBUG(Service_PSM, "called, state={}", state);
+
+        should_signal_charger_type = state;
+
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(RESULT_SUCCESS);
+    }
+
+    void SetPowerSupplyChangeEventEnabled(Kernel::HLERequestContext& ctx) {
+        IPC::RequestParser rp{ctx};
+        const auto state = rp.Pop<bool>();
+        LOG_DEBUG(Service_PSM, "called, state={}", state);
+
+        should_signal_power_supply = state;
+
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(RESULT_SUCCESS);
+    }
+
+    void SetBatteryVoltageStateChangeEventEnabled(Kernel::HLERequestContext& ctx) {
+        IPC::RequestParser rp{ctx};
+        const auto state = rp.Pop<bool>();
+        LOG_DEBUG(Service_PSM, "called, state={}", state);
+
+        should_signal_battery_voltage = state;
+
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(RESULT_SUCCESS);
+    }
+
+    bool should_signal_charger_type{};
+    bool should_signal_power_supply{};
+    bool should_signal_battery_voltage{};
+    bool should_signal{};
+    Kernel::EventPair state_change_event;
+};
+
 class PSM final : public ServiceFramework<PSM> {
 public:
     explicit PSM(Core::System& system_) : ServiceFramework{system_, "psm"} {
@@ -24,7 +127,7 @@ public:
             {4, nullptr, "IsBatteryChargingEnabled"},
             {5, nullptr, "AcquireControllerPowerSupply"},
             {6, nullptr, "ReleaseControllerPowerSupply"},
-            {7, nullptr, "OpenSession"},
+            {7, &PSM::OpenSession, "OpenSession"},
             {8, nullptr, "EnableEnoughPowerChargeEmulation"},
             {9, nullptr, "DisableEnoughPowerChargeEmulation"},
             {10, nullptr, "EnableFastBatteryCharging"},
@@ -61,6 +164,14 @@ private:
         rb.PushEnum(charger_type);
     }
 
+    void OpenSession(Kernel::HLERequestContext& ctx) {
+        LOG_DEBUG(Service_PSM, "called");
+
+        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
+        rb.Push(RESULT_SUCCESS);
+        rb.PushIpcInterface<IPsmSession>(system);
+    }
+
     enum class ChargerType : u32 {
         Unplugged = 0,
         RegularCharger = 1,