From a1df8a1896db44472f6a92166dfc86bf7dbcd373 Mon Sep 17 00:00:00 2001
From: Jesse Buhagiar <jooster669@gmail.com>
Date: Mon, 11 Apr 2022 22:00:27 +1000
Subject: [PATCH] Kernel/USB: Add `control_transfer()` function `USB::Device`

Some other parts of the USB stack may require us to perform a control
transfer. Instead of abusing `friend` to expose the default pipe, let's
just expose it via a function.
---
 Kernel/Bus/USB/USBDevice.cpp | 5 +++++
 Kernel/Bus/USB/USBDevice.h   | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/Kernel/Bus/USB/USBDevice.cpp b/Kernel/Bus/USB/USBDevice.cpp
index 4e21a3ca69..695b9c4b3d 100644
--- a/Kernel/Bus/USB/USBDevice.cpp
+++ b/Kernel/Bus/USB/USBDevice.cpp
@@ -138,4 +138,9 @@ ErrorOr<void> Device::enumerate_device()
     return {};
 }
 
+ErrorOr<size_t> Device::control_transfer(u8 request_type, u8 request, u16 value, u16 index, u16 length, void* data)
+{
+    return TRY(m_default_pipe->control_transfer(request_type, request, value, index, length, data));
+}
+
 }
diff --git a/Kernel/Bus/USB/USBDevice.h b/Kernel/Bus/USB/USBDevice.h
index e2a1aac4ff..1adc4c93c8 100644
--- a/Kernel/Bus/USB/USBDevice.h
+++ b/Kernel/Bus/USB/USBDevice.h
@@ -47,6 +47,8 @@ public:
     USBController& controller() { return *m_controller; }
     USBController const& controller() const { return *m_controller; }
 
+    ErrorOr<size_t> control_transfer(u8 request_type, u8 request, u16 value, u16 index, u16 length, void* data);
+
 protected:
     Device(NonnullRefPtr<USBController> controller, u8 address, u8 port, DeviceSpeed speed, NonnullOwnPtr<Pipe> default_pipe);