adbmouse: support for movement data in R0.

devices/common/adb/adbmouse.cpp

@@ -25,9 +25,18 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #include <devices/deviceregistry.h>
 
 AdbMouse::AdbMouse(std::string name) : AdbDevice(name) {
+    EventManager::get_instance()->add_mouse_handler(this, &AdbMouse::event_handler);
+
     this->reset();
 }
 
+void AdbMouse::event_handler(const MouseEvent& event) {
+    if (event.flags & MOUSE_EVENT_MOTION) {
+        this->x_rel += event.xrel;
+        this->y_rel += event.yrel;
+    }
+}
+
 void AdbMouse::reset() {
     this->my_addr = ADB_ADDR_RELPOS;
     this->dev_handler_id = 1;
@@ -35,6 +44,37 @@ void AdbMouse::reset() {
     this->srq_flag = 1; // enable service requests
 }
 
+bool AdbMouse::get_register_0() {
+    if (this->x_rel || this->y_rel) {
+        uint8_t* out_buf = this->host_obj->get_output_buf();
+
+        // report Y-axis motion
+        if (this->y_rel < -64)
+            out_buf[0] = 0x40 | 0x80;
+        else if (this->y_rel > 63)
+            out_buf[0] = 0x3F | 0x80;
+        else
+            out_buf[0] = (this->y_rel & 0x7F) | 0x80;
+
+        // report X-axis motion
+        if (this->x_rel < -64)
+            out_buf[1] = 0x40 | 0x80;
+        else if (this->x_rel > 63)
+            out_buf[1] = 0x3F | 0x80;
+        else
+            out_buf[1] = (this->x_rel & 0x7F) | 0x80;
+
+        // reset accumulated motion data
+        this->x_rel = 0;
+        this->y_rel = 0;
+
+        this->host_obj->set_output_count(2);
+        return true;
+    }
+
+    return false;
+}
+
 void AdbMouse::set_register_3() {
     if (this->host_obj->get_input_count() < 2) // ensure we got enough data
         return;

devices/common/adb/adbmouse.h

@@ -24,6 +24,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #ifndef ADB_MOUSE_H
 #define ADB_MOUSE_H
 
+#include <core/hostevents.h>
 #include <devices/common/adb/adbdevice.h>
 #include <devices/common/hwcomponent.h>
 
@@ -40,8 +41,14 @@ public:
     }
 
     void reset() override;
+    void event_handler(const MouseEvent& event);
 
+    bool get_register_0() override;
     void set_register_3() override;
+
+private:
+    int32_t x_rel = 0;
+    int32_t y_rel = 0;
 };
 
 #endif // ADB_MOUSE_H