kapi/devices: add parent back-pointer to device

3 files changed, 15 insertions, 0 deletions

diff --git a/kapi/include/kapi/devices/device.hpp b/kapi/include/kapi/devices/device.hpp
index b3647da..9939494 100644
--- a/kapi/include/kapi/devices/device.hpp
+++ b/kapi/include/kapi/devices/device.hpp
@@ -3,6 +3,7 @@
 
 // IWYU pragma: private, include "kapi/devices.hpp"
 
+#include <kstd/memory>
 #include <kstd/string>
 
 #include <cstddef>
@@ -62,9 +63,14 @@ namespace kapi::devices
     [[nodiscard]] virtual auto is_block_device() const -> bool;
 
   private:
+    friend struct bus;
+
+    auto set_parent(kstd::observer_ptr<struct bus> parent) -> void;
+
     size_t m_major;
     size_t m_minor;
     kstd::string m_name;
+    kstd::observer_ptr<bus> m_parent;
   };
 
   //! @}
diff --git a/kernel/kapi/devices/bus.cpp b/kernel/kapi/devices/bus.cpp
index 66b84d2..5f0dfcd 100644
--- a/kernel/kapi/devices/bus.cpp
+++ b/kernel/kapi/devices/bus.cpp
@@ -45,6 +45,7 @@ namespace kapi::devices
   auto bus::add_child(kstd::unique_ptr<device> child) -> void
   {
     auto observer = m_observers.emplace_back(child.get());
+    child->set_parent(kstd::make_observer(this));
     m_devices.push_back(std::move(child));
     kapi::devices::register_device(*observer);
 
diff --git a/kernel/kapi/devices/device.cpp b/kernel/kapi/devices/device.cpp
index 9f7a404..41d96dc 100644
--- a/kernel/kapi/devices/device.cpp
+++ b/kernel/kapi/devices/device.cpp
@@ -1,5 +1,8 @@
 #include "kapi/devices/device.hpp"
 
+#include "kapi/devices/bus.hpp"
+
+#include <kstd/memory>
 #include <kstd/string>
 
 #include <cstddef>
@@ -32,4 +35,9 @@ namespace kapi::devices
     return false;
   }
 
+  auto device::set_parent(kstd::observer_ptr<bus> parent) -> void
+  {
+    m_parent = parent;
+  }
+
 }  // namespace kapi::devices
\ No newline at end of file