From fd9f8c90a5b868644aa56bb31cebaf6e847ea82c Mon Sep 17 00:00:00 2001
From: Maxim Poliakovski <maximumspatium@googlemail.com>
Date: Wed, 26 Jul 2023 04:39:19 +0200
Subject: [PATCH] Basic ADB mouse device emulation.

For now, it solely handles the basic ADB commands.
---
 devices/common/adb/adbmouse.cpp | 69 +++++++++++++++++++++++++++++++++
 devices/common/adb/adbmouse.h   | 47 ++++++++++++++++++++++
 2 files changed, 116 insertions(+)
 create mode 100644 devices/common/adb/adbmouse.cpp
 create mode 100644 devices/common/adb/adbmouse.h

diff --git a/devices/common/adb/adbmouse.cpp b/devices/common/adb/adbmouse.cpp
new file mode 100644
index 0000000..3cfc871
--- /dev/null
+++ b/devices/common/adb/adbmouse.cpp
@@ -0,0 +1,69 @@
+/*
+DingusPPC - The Experimental PowerPC Macintosh emulator
+Copyright (C) 2018-23 divingkatae and maximum
+                      (theweirdo)     spatium
+
+(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+/** @file Apple Desktop Bus Mouse emulation. */
+
+#include <devices/common/adb/adbmouse.h>
+#include <devices/deviceregistry.h>
+
+AdbMouse::AdbMouse(std::string name) : AdbDevice(name) {
+    this->reset();
+}
+
+void AdbMouse::reset() {
+    this->my_addr = ADB_ADDR_RELPOS;
+    this->dev_handler_id = 1;
+    this->exc_event_flag = 1;
+    this->srq_flag = 1; // enable service requests
+}
+
+void AdbMouse::set_register_3() {
+    if (this->host_obj->get_input_count() < 2) // ensure we got enough data
+        return;
+
+    const uint8_t*  in_data = this->host_obj->get_input_buf();
+
+    switch (in_data[1]) {
+    case 0:
+        this->my_addr  = in_data[0] & 0xF;
+        this->srq_flag = !!(in_data[0] & 0x20);
+        break;
+    case 1:
+    case 2:
+        this->dev_handler_id = in_data[1];
+        break;
+    case 4: // extended mouse protocol isn't supported yet
+        break;
+    case 0xFE: // move to a new address if there was no collision
+        if (!this->got_collision) {
+            this->my_addr = in_data[0] & 0xF;
+        }
+        break;
+    default:
+        LOG_F(WARNING, "%s: unknown handler ID = 0x%X", this->name.c_str(), in_data[1]);
+    }
+}
+
+static const DeviceDescription AdbMouse_Descriptor = {
+    AdbMouse::create, {}, {}
+};
+
+REGISTER_DEVICE(AdbMouse, AdbMouse_Descriptor);
diff --git a/devices/common/adb/adbmouse.h b/devices/common/adb/adbmouse.h
new file mode 100644
index 0000000..0e36529
--- /dev/null
+++ b/devices/common/adb/adbmouse.h
@@ -0,0 +1,47 @@
+/*
+DingusPPC - The Experimental PowerPC Macintosh emulator
+Copyright (C) 2018-23 divingkatae and maximum
+                      (theweirdo)     spatium
+
+(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+/** @file Apple Desktop Bus Mouse definitions. */
+
+#ifndef ADB_MOUSE_H
+#define ADB_MOUSE_H
+
+#include <devices/common/adb/adbdevice.h>
+#include <devices/common/hwcomponent.h>
+
+#include <memory>
+#include <string>
+
+class AdbMouse : public AdbDevice {
+public:
+    AdbMouse(std::string name);
+    ~AdbMouse() = default;
+
+    static std::unique_ptr<HWComponent> create() {
+        return std::unique_ptr<AdbMouse>(new AdbMouse("ADB-MOUSE"));
+    }
+
+    void reset() override;
+
+    void set_register_3() override;
+};
+
+#endif // ADB_MOUSE_H