9f73476b37
The new 'dde_linux' repository will host device drivers ported from the Linux kernel. In contrast to the original 'linux_drivers' repository, 'dde_linux' does not contain any 3rd-party source code. To download the Linux kernel source code and extract the drivers, execute the 'make prepare' rule of the top-level Makefile. The initial version of the 'dde_linux' repository comes with an USB driver. The porting methodology follows the path of the Intel GEM port. Instead of attempting to provide a generic Linux environment that works across drivers, each driver comes with a specially tailored DDE. The DDE consists of Genode-specific implementations of Linux API functions as declared in 'lx_emul.h'. Most of these functions are dummies that must merely be provided to resolve dependencies at the linking stage. They are called by unused code-paths. As of now, the USB driver support UHCI, EHCI on the x86_32 platform. I exposes USB HID devices and USB storage devices via Genode's input-session and block-session respectively. The USB driver is accompanied with two run scripts 'run/usb_hid.run' and 'run/usb_storage.run'.
78 lines
1.9 KiB
C++
78 lines
1.9 KiB
C++
/*
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* \brief Linux 2.6 Input driver for USB HID
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* \author Christian Helmuth
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* \author Christian Prochaska
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* \author Sebastian Sumpf
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* \date 2011-07-15
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*/
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/*
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* Copyright (C) 2011-2012 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#include <base/printf.h>
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#include <base/rpc_server.h>
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#include <input/component.h>
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#include <os/ring_buffer.h>
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#include <lx_emul.h>
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#undef RELEASE
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using namespace Genode;
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/*********************
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** Input component **
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*********************/
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typedef Ring_buffer<Input::Event, 512> Input_ring_buffer;
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static Input_ring_buffer ev_queue;
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namespace Input {
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void event_handling(bool enable) { }
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bool event_pending() { return !ev_queue.empty(); }
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Event get_event() { return ev_queue.get(); }
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}
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/**
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* Input event call-back function
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*/
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static void input_callback(enum input_event_type type,
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unsigned keycode,
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int absolute_x, int absolute_y,
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int relative_x, int relative_y)
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{
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Input::Event::Type t = Input::Event::INVALID;
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switch (type) {
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case EVENT_TYPE_PRESS: t = Input::Event::PRESS; break;
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case EVENT_TYPE_RELEASE: t = Input::Event::RELEASE; break;
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case EVENT_TYPE_MOTION: t = Input::Event::MOTION; break;
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case EVENT_TYPE_WHEEL: t = Input::Event::WHEEL; break;
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}
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try {
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ev_queue.add(Input::Event(t, keycode,
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absolute_x, absolute_y,
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relative_x, relative_y));
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} catch (Input_ring_buffer::Overflow) {
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PWRN("input ring buffer overflow");
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}
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}
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void start_input_service(void *ep)
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{
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Rpc_entrypoint *e = static_cast<Rpc_entrypoint *>(ep);
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static Input::Root input_root(e, env()->heap());
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env()->parent()->announce(e->manage(&input_root));
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genode_input_register(input_callback);
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}
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