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Linux: Add an evdev based controller backend, to replace SDL.

This commit is contained in:
Scott Mansell 2015-06-29 12:17:35 +12:00
parent 9a244f07fa
commit 2721fdf8a9
8 changed files with 438 additions and 0 deletions
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13
CMakeLists.txt
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@ -513,6 +513,19 @@ if(USE_EGL)
add_definitions(-DUSE_EGL=1)
endif()
if(${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
include(FindLibudev OPTIONAL)
include(FindLibevdev OPTIONAL)
if(LIBUDEV_FOUND AND LIBEVDEV_FOUND)
message("libevdev/libudev found, enabling evdev controller backend")
add_definitions(-DHAVE_LIBUDEV=1)
add_definitions(-DHAVE_LIBEVDEV=1)
include_directories(${LIBUDEV_INCLUDE_DIR} ${LIBEVDEV_INCLUDE_DIR})
else()
message("Could find libevdev/libudev, disabling evdev controller backend")
endif()
endif()
########################################
# Setup include directories (and make sure they are preferred over the Externals)
#

33
CMakeTests/FindLibevdev.cmake Normal file
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@ -0,0 +1,33 @@
# - Try to find libevdev
# Once done this will define
# LIBEVDEV_FOUND - System has libevdev
# LIBEVDEV_INCLUDE_DIRS - The libevdev include directories
# LIBEVDEV_LIBRARIES - The libraries needed to use libevdev
find_package(PkgConfig)
pkg_check_modules(PC_LIBEVDEV QUIET libevdev)
FIND_PATH(
LIBEVDEV_INCLUDE_DIR libevdev/libevdev.h
HINTS ${PC_LIBEVDEV_INCLUDEDIR} ${PC_LIBEVDEV_INCLUDE_DIRS}
/usr/include
/usr/local/include
${LIBEVDEV_PATH_INCLUDES}
)
FIND_LIBRARY(
LIBEVDEV_LIBRARY
NAMES evdev libevdev
HINTS ${PC_LIBEVDEV_LIBDIR} ${PC_LIBEVDEV_LIBRARY_DIRS}
PATHS ${ADDITIONAL_LIBRARY_PATHS}
${LIBEVDEV_PATH_LIB}
)
set(LIBEVDEV_LIBRARIES ${LIBEVDEV_LIBRARY} )
set(LIBEVDEV_INCLUDE_DIRS ${LIBEVDEV_INCLUDE_DIR} )
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(libevdev DEFAULT_MSG
LIBEVDEV_LIBRARY LIBEVDEV_INCLUDE_DIR)
mark_as_advanced(LIBEVDEV_INCLUDE_DIR LIBEVDEV_LIBRARY )

28
CMakeTests/FindLibudev.cmake Normal file
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@ -0,0 +1,28 @@
# - Try to find LIBUDEV
# Once done this will define
# LIBUDEV_FOUND - System has LIBUDEV
# LIBUDEV_INCLUDE_DIRS - The LIBUDEV include directories
# LIBUDEV_LIBRARIES - The libraries needed to use LIBUDEV
FIND_PATH(
LIBUDEV_INCLUDE_DIR libudev.h
/usr/include
/usr/local/include
${LIBUDEV_PATH_INCLUDES}
)
FIND_LIBRARY(
LIBUDEV_LIBRARY
NAMES udev libudev
PATHS ${ADDITIONAL_LIBRARY_PATHS}
${LIBUDEV_PATH_LIB}
)
set(LIBUDEV_LIBRARIES ${LIBUDEV_LIBRARY} )
set(LIBUDEV_INCLUDE_DIRS ${LIBUDEV_INCLUDE_DIR} )
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(LIBUDEV DEFAULT_MSG
LIBUDEV_LIBRARY LIBUDEV_INCLUDE_DIR)
mark_as_advanced(LIBUDEV_INCLUDE_DIR LIBUDEV_LIBRARY )

5
Source/Core/InputCommon/CMakeLists.txt
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@ -37,6 +37,11 @@ elseif(ANDROID)
ControllerInterface/Android/Android.cpp)
endif()
if(LIBEVDEV_FOUND AND LIBUDEV_FOUND)
set(SRCS ${SRCS} ControllerInterface/evdev/evdev.cpp)
set(LIBS ${LIBS} ${LIBEVDEV_LIBRARY} ${LIBUDEV_LIBRARY})
endif()
if(SDL_FOUND OR SDL2_FOUND)
set(SRCS ${SRCS} ControllerInterface/SDL/SDL.cpp)
if (SDL2_FOUND)

6
Source/Core/InputCommon/ControllerInterface/ControllerInterface.cpp
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@ -26,6 +26,9 @@
#ifdef CIFACE_USE_ANDROID
#include "InputCommon/ControllerInterface/Android/Android.h"
#endif
#ifdef CIFACE_USE_EVDEV
#include "InputCommon/ControllerInterface/evdev/evdev.h"
#endif
using namespace ciface::ExpressionParser;
@ -69,6 +72,9 @@ void ControllerInterface::Initialize(void* const hwnd)
#ifdef CIFACE_USE_ANDROID
ciface::Android::Init(m_devices);
#endif
#ifdef CIFACE_USE_EVDEV
ciface::evdev::Init(m_devices);
#endif
m_is_init = true;
}

3
Source/Core/InputCommon/ControllerInterface/ControllerInterface.h
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@ -35,6 +35,9 @@
#if defined(HAVE_SDL) && HAVE_SDL
#define CIFACE_USE_SDL
#endif
#if defined(HAVE_LIBEVDEV) && defined(HAVE_LIBUDEV)
#define CIFACE_USE_EVDEV
#endif
//
// ControllerInterface

264
Source/Core/InputCommon/ControllerInterface/evdev/evdev.cpp Normal file
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@ -0,0 +1,264 @@
// Copyright 2015 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include <libudev.h>
#include <unistd.h>
#include "Common/Logging/Log.h"
#include "InputCommon/ControllerInterface/evdev/evdev.h"
namespace ciface
{
namespace evdev
{
void Init(std::vector<Core::Device*> &controllerDevices)
{
int num_controllers = 0;
// We use Udev to find any devices. In the future this will allow for hotplugging.
// But for now it is essentially iterating over /dev/input/event0 to event31. However if the
// naming scheme is ever updated in the future, this *should* be forwards compatable.
struct udev* udev = udev_new();
_assert_msg_(PAD, udev != 0, "Couldn't initilize libudev.");
// List all input devices
udev_enumerate* enumerate = udev_enumerate_new(udev);
udev_enumerate_add_match_subsystem(enumerate, "input");
udev_enumerate_scan_devices(enumerate);
udev_list_entry* devices = udev_enumerate_get_list_entry(enumerate);
// Iterate over all input devices
udev_list_entry* dev_list_entry;
udev_list_entry_foreach(dev_list_entry, devices)
{
const char* path = udev_list_entry_get_name(dev_list_entry);
udev_device* dev = udev_device_new_from_syspath(udev, path);
const char* devnode = udev_device_get_devnode(dev);
// We only care about devices which we have read/write access to.
if (access(devnode, W_OK) == 0)
{
// Unfortunately udev gives us no way to filter out the non event device interfaces.
// So we open it and see if it works with evdev ioctls or not.
evdevDevice* input = new evdevDevice(devnode, num_controllers);
if (input->IsInteresting())
{
controllerDevices.push_back(input);
num_controllers++;
}
else
{
// Either it wasn't a evdev device, or it didn't have at least 8 buttons or two axis.
delete input;
}
}
udev_device_unref(dev);
}
udev_enumerate_unref(enumerate);
udev_unref(udev);
}
evdevDevice::evdevDevice(const std::string &devnode, int id) : m_devfile(devnode), m_id(id)
{
// The device file will be read on one of the main threads, so we open in non-blocking mode.
m_fd = open(devnode.c_str(), O_RDWR|O_NONBLOCK);
int ret = libevdev_new_from_fd(m_fd, &m_dev);
if (ret != 0)
{
// This useally fails because the device node isn't an evdev device, such as /dev/input/js0
m_initialized = false;
close(m_fd);
return;
}
m_name = libevdev_get_name(m_dev);
// Controller buttons (and keyboard keys)
int num_buttons = 0;
for (int key = 0; key < KEY_MAX; key++)
if (libevdev_has_event_code(m_dev, EV_KEY, key))
AddInput(new Button(num_buttons++, key, m_dev));
// Absolute axis (thumbsticks)
int num_axis = 0;
for (int axis = 0; axis < 0x100; axis++)
if (libevdev_has_event_code(m_dev, EV_ABS, axis))
{
AddAnalogInputs(new Axis(num_axis, axis, false, m_dev),
new Axis(num_axis, axis, true, m_dev));
num_axis++;
}
// Force feedback
if (libevdev_has_event_code(m_dev, EV_FF, FF_PERIODIC))
{
for (auto type : {FF_SINE, FF_SQUARE, FF_TRIANGLE, FF_SAW_UP, FF_SAW_DOWN})
if (libevdev_has_event_code(m_dev, EV_FF, type))
AddOutput(new ForceFeedback(type, m_dev));
}
if (libevdev_has_event_code(m_dev, EV_FF, FF_RUMBLE))
{
AddOutput(new ForceFeedback(FF_RUMBLE, m_dev));
}
// TODO: Add leds as output devices
m_initialized = true;
m_interesting = num_axis >= 2 || num_buttons >= 8;
}
evdevDevice::~evdevDevice()
{
if (m_initialized)
{
libevdev_free(m_dev);
close(m_fd);
}
}
void evdevDevice::UpdateInput()
{
// Run through all evdev events
// libevdev will keep track of the actual controller state internally which can be queried
// later with libevdev_fetch_event_value()
input_event ev;
int rc = LIBEVDEV_READ_STATUS_SUCCESS;
do
{
if (rc == LIBEVDEV_READ_STATUS_SYNC)
rc = libevdev_next_event(m_dev, LIBEVDEV_READ_FLAG_SYNC, &ev);
else
rc = libevdev_next_event(m_dev, LIBEVDEV_READ_FLAG_NORMAL, &ev);
} while (rc >= 0);
}
std::string evdevDevice::Button::GetName() const
{
// Buttons below 0x100 are mostly keyboard keys, and the names make sense
if (m_code < 0x100)
{
const char* name = libevdev_event_code_get_name(EV_KEY, m_code);
if (name)
return std::string(name);
}
// But controllers use codes above 0x100, and the standard label often doesn't match.
// We are better off with Button 0 and so on.
return "Button " + std::to_string(m_index);
}
ControlState evdevDevice::Button::GetState() const
{
int value = 0;
libevdev_fetch_event_value(m_dev, EV_KEY, m_code, &value);
return value;
}
evdevDevice::Axis::Axis(u8 index, u16 code, bool upper, libevdev* dev) :
m_code(code), m_index(index), m_upper(upper), m_dev(dev)
{
m_range = libevdev_get_abs_maximum(m_dev, m_code);
}
std::string evdevDevice::Axis::GetName() const
{
return "Axis " + std::to_string(m_index) + (m_upper ? "+" : "-");
}
ControlState evdevDevice::Axis::GetState() const
{
int value = 0;
libevdev_fetch_event_value(m_dev, EV_ABS, m_code, &value);
if (m_upper)
return std::max(0.0, double(value) / double(m_range) - 0.5) * 2.0;
else
return (0.5 - std::min(0.5, double(value) / double(m_range))) * 2.0;
}
std::string evdevDevice::ForceFeedback::GetName() const
{
// We have some default names.
switch (m_type)
{
case FF_SINE:
return "Sine";
case FF_TRIANGLE:
return "Triangle";
case FF_SQUARE:
return "Square";
case FF_RUMBLE:
return "LeftRight";
default:
{
const char* name = libevdev_event_code_get_name(EV_FF, m_type);
if (name)
return std::string(name);
return "Unknown";
}
}
}
void evdevDevice::ForceFeedback::SetState(ControlState state)
{
// libevdev doesn't have nice helpers for forcefeedback
// we will use the file descriptors directly.
if (state > 0) // Upload and start an effect.
{
ff_effect effect;
effect.id = -1;
effect.direction = 0; // down
effect.replay.length = 500; // 500ms
effect.replay.delay = 0;
effect.trigger.button = 0; // don't trigger on button press
effect.trigger.interval = 0;
// This is the the interface that XInput uses, with 2 motors of differing sizes/frequencies that
// are controlled seperatally
if (m_type == FF_RUMBLE)
{
effect.type = FF_RUMBLE;
// max ranges tuned to 'feel' similar in magnitude to triangle/sine on xbox360 controller
effect.u.rumble.strong_magnitude = u16(state * 0x4000);
effect.u.rumble.weak_magnitude = u16(state * 0xFFFF);
}
else // FF_PERIODIC, a more generic interface.
{
effect.type = FF_PERIODIC;
effect.u.periodic.waveform = m_type;
effect.u.periodic.phase = 0x7fff; // 180 degrees
effect.u.periodic.offset = 0;
effect.u.periodic.period = 10;
effect.u.periodic.magnitude = s16(state * 0x7FFF);
effect.u.periodic.envelope.attack_length = 0; // no attack
effect.u.periodic.envelope.attack_level = 0;
effect.u.periodic.envelope.fade_length = 0;
effect.u.periodic.envelope.fade_level = 0;
}
ioctl(m_fd, EVIOCSFF, &effect);
m_id = effect.id;
input_event play;
play.type = EV_FF;
play.code = m_id;
play.value = 1;
write(m_fd, (const void*) &play, sizeof(play));
}
else if (m_id != -1) // delete the effect (which also stops it)
{
ioctl(m_id, EVIOCRMFF, m_id);
}
}
}
}

86
Source/Core/InputCommon/ControllerInterface/evdev/evdev.h Normal file
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@ -0,0 +1,86 @@
// Copyright 2015 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#pragma once
#include <string>
#include <vector>
#include <libevdev/libevdev.h>
#include "InputCommon/ControllerInterface/Device.h"
namespace ciface
{
namespace evdev
{
void Init(std::vector<Core::Device*>& devices);
class evdevDevice : public Core::Device
{
private:
class Button : public Core::Device::Input
{
public:
std::string GetName() const override;
Button(u8 index, u16 code, libevdev* dev) : m_index(index), m_code(code), m_dev(dev) {}
ControlState GetState() const override;
private:
const u8 m_index;
const u16 m_code;
libevdev* m_dev;
};
class Axis : public Core::Device::Input
{
public:
std::string GetName() const override;
Axis(u8 index, u16 code, bool upper, libevdev* dev);
ControlState GetState() const override;
private:
const u16 m_code;
const u8 m_index;
const bool m_upper;
int m_range;
libevdev* m_dev;
};
class ForceFeedback : public Core::Device::Output
{
public:
std::string GetName() const override;
ForceFeedback(u16 type, libevdev* dev) : m_type(type), m_dev(dev), m_id(-1) { m_fd = libevdev_get_fd(dev); }
void SetState(ControlState state) override;
private:
const u16 m_type;
libevdev* m_dev;
int m_fd;
int m_id;
};
public:
void UpdateInput() override;
evdevDevice(const std::string &devnode, int id);
~evdevDevice();
std::string GetName() const override { return m_name; }
int GetId() const override { return m_id; }
std::string GetSource() const override { return "evdev"; }
bool IsInteresting() const { return m_initialized && m_interesting; }
private:
const std::string m_devfile;
int m_fd;
libevdev* m_dev;
std::string m_name;
const int m_id;
bool m_initialized;
bool m_interesting;
};
}
}