AdbDevice - the base class for ADB devices.

devices/common/adb/adbdevice.cpp

@@ -0,0 +1,93 @@
+/*
+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 Base class for Apple Desktop Bus devices. */
+
+#include <core/timermanager.h>
+#include <devices/common/adb/adbdevice.h>
+#include <loguru.hpp>
+#include <machines/machinebase.h>
+
+AdbDevice::AdbDevice(std::string name) {
+    this->set_name(name);
+    this->supports_types(HWCompType::ADB_DEV);
+}
+
+int AdbDevice::device_postinit() {
+    // register itself with the ADB host
+    this->host_obj = dynamic_cast<AdbBus*>(gMachineObj->get_comp_by_type(HWCompType::ADB_HOST));
+    this->host_obj->register_device(this);
+
+    return 0;
+};
+
+bool AdbDevice::talk(const uint8_t dev_addr, const uint8_t reg_num) {
+    if (dev_addr == this->my_addr && !this->got_collision) {
+        // see if another device already responded to this command
+        if (this->host_obj->already_answered()) {
+            this->got_collision = true;
+            return false;
+        }
+
+        switch(reg_num & 3) {
+        case 0:
+            return this->get_register_0();
+        case 1:
+            return this->get_register_1();
+        case 2:
+            return this->get_register_2();
+        case 3:
+            return this->get_register_3();
+        default:
+            return false;
+        }
+    } else {
+        return false;
+    }
+}
+
+void AdbDevice::listen(const uint8_t dev_addr, const uint8_t reg_num) {
+    if (dev_addr == this->my_addr) {
+        switch(reg_num & 3) {
+        case 0:
+            this->set_register_0();
+        case 1:
+            this->set_register_1();
+        case 2:
+            this->set_register_2();
+        case 3:
+            this->set_register_3();
+        }
+    }
+}
+
+bool AdbDevice::get_register_3() {
+    uint8_t* out_buf = this->host_obj->get_output_buf();
+    out_buf[0] = this->gen_random_address() | (this->exc_event_flag << 6) |
+                 (this->srq_flag << 5);
+    out_buf[1] = this->dev_handler_id;
+    this->host_obj->set_output_count(2);
+    return true;
+}
+
+uint8_t AdbDevice::gen_random_address() {
+    return (TimerManager::get_instance()->current_time_ns() + 8) & 0xF;
+}

devices/common/adb/adbdevice.h

@@ -0,0 +1,77 @@
+/*
+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 Base class for Apple Desktop Bus devices. */
+
+#ifndef ADB_DEVICE_H
+#define ADB_DEVICE_H
+
+#include <devices/common/adb/adbbus.h>
+#include <devices/common/hwcomponent.h>
+
+#include <cstring>
+#include <functional>
+#include <string>
+
+/** Common ADB device addresses/types. */
+enum {
+    ADB_ADDR_KBD    = 2, // keyboards
+    ADB_ADDR_RELPOS = 3, // relative position devices (mouse)
+    ADB_ADDR_ABSPOS = 4, // absolute position devices (graphic tablets)
+};
+
+class AdbBus; // forward declaration to prevent compiler errors
+
+class AdbDevice : public HWComponent {
+public:
+    AdbDevice(std::string name);
+    ~AdbDevice() = default;
+
+    int device_postinit() override;
+
+    virtual void reset() = 0;
+    virtual bool talk(const uint8_t dev_addr, const uint8_t reg_num);
+    virtual void listen(const uint8_t dev_addr, const uint8_t reg_num);
+    virtual uint8_t get_address() { return this->my_addr; };
+
+protected:
+    uint8_t gen_random_address();
+
+    virtual bool get_register_0() { return false; };
+    virtual bool get_register_1() { return false; };
+    virtual bool get_register_2() { return false; };
+    virtual bool get_register_3();
+
+    virtual void set_register_0() {};
+    virtual void set_register_1() {};
+    virtual void set_register_2() {};
+    virtual void set_register_3() {};
+
+    uint8_t exc_event_flag = 0;
+    uint8_t srq_flag = 0;
+    uint8_t my_addr = 0;
+    uint8_t dev_handler_id = 0;
+    bool    got_collision = false;
+
+    AdbBus* host_obj = nullptr;
+};
+
+#endif // ADB_DEVICE_H