From 1cad7524b291fd7a6f77e01bb90e763e6b557620 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Mon, 27 Jul 2026 12:26:23 +0200
Subject: kapi: add device resources

---
 kernel/kapi/devices/device.cpp | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

(limited to 'kernel/kapi/devices/device.cpp')

diff --git a/kernel/kapi/devices/device.cpp b/kernel/kapi/devices/device.cpp
index 9c2d8d40..a05a1653 100644
--- a/kernel/kapi/devices/device.cpp
+++ b/kernel/kapi/devices/device.cpp
@@ -2,10 +2,18 @@
 
 #include <kapi/devices.hpp>
 #include <kapi/devices/bus.hpp>
+#include <kapi/devices/resource.hpp>
 
 #include <kstd/memory.hpp>
 #include <kstd/mutex.hpp>
+#include <kstd/result.hpp>
 #include <kstd/string.hpp>
+#include <kstd/system_error.hpp>
+#include <kstd/vector.hpp>
+
+#include <algorithm>
+#include <cstddef>
+#include <ranges>
 
 namespace kapi::devices
 {
@@ -75,6 +83,36 @@ namespace kapi::devices
     m_driver_data = data;
   }
 
+  auto device::resources() const -> kstd::vector<resource>
+  {
+    auto guard = kstd::lock_guard{m_lock};
+    return m_resources;
+  }
+
+  auto device::request_resource(resource_type type, std::size_t index) const -> kstd::result<resource>
+  {
+    auto guard = kstd::lock_guard{m_lock};
+
+    auto numbered_resources = std::views::enumerate(m_resources);
+    auto found = std::ranges::find_if(numbered_resources, [&](auto entry) {
+      auto const & [number, resource] = entry;
+      return resource.type == type && static_cast<std::size_t>(number) == index;
+    });
+
+    if (found != numbered_resources.end())
+    {
+      return kstd::success(*found.base());
+    }
+
+    return kstd::failure(make_error_code(kstd::errc::invalid_argument));
+  }
+
+  auto device::set_resources(kstd::vector<resource> resources) -> void
+  {
+    auto guard = kstd::lock_guard{m_lock};
+    m_resources = resources;
+  }
+
   auto device::query_facet(kapi::capabilities::facet_id) -> void *
   {
     return nullptr;
-- 
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