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Merge pull request #181 from thefiddler/evdev
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[Linux] Implement evdev joystick driver
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@thefiddler
thefiddler committed Sep 20, 2014
2 parents a1c3950 + 179c823 commit 2b3a4c5
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Showing 4 changed files with 473 additions and 183 deletions.
2 changes: 2 additions & 0 deletions Source/OpenTK/Input/GamePadButtons.cs
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Expand Up @@ -175,6 +175,8 @@ public override string ToString()
sb.Append("St");
if (BigButton == ButtonState.Pressed)
sb.Append("Gd");
if (Back == ButtonState.Pressed)
sb.Append("Bk");
if (LeftShoulder == ButtonState.Pressed)
sb.Append("L");
if (RightShoulder == ButtonState.Pressed)
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185 changes: 184 additions & 1 deletion Source/OpenTK/Platform/Linux/Bindings/Evdev.cs
View file
Expand Up @@ -29,13 +29,18 @@

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using OpenTK.Input;

namespace OpenTK.Platform.Linux
{
// Bindings for linux/input.h
class Evdev
{
public const int KeyCount = 0x300;
public const int AxisCount = 0x40;
public const int EventCount = (int)EvdevType.CNT;

#region KeyMap

public static readonly Key[] KeyMap = new Key[]
Expand Down Expand Up @@ -365,9 +370,118 @@ public static MouseButton GetMouseButton(EvdevButton button)
return MouseButton.Left;
}
}

static uint IOCreate(DirectionFlags dir, int number, int length)
{
long v =
((byte)dir << 30) |
((byte)'E' << 8) |
(number << 0) |
(length << 16);
return (uint)v;
}

// Get absolute value / limits
public static int GetAbs(int fd, EvdevAxis axis, out InputAbsInfo info)
{
info = default(InputAbsInfo);
unsafe
{
fixed (InputAbsInfo* pinfo = &info)
{
// EVIOCGABS(abs) = _IOR('E', 0x40 + (abs), struct input_absinfo)
uint ioctl = IOCreate(DirectionFlags.Read, (int)axis + 0x40, BlittableValueType<InputAbsInfo>.Stride);
int retval = Libc.ioctl(fd, ioctl, new IntPtr(pinfo));
return retval;
}
}
}

// Get supported event bits
public static int GetBit(int fd, EvdevType ev, int length, IntPtr data)
{
// EVIOCGBIT = _IOC(_IOC_READ, 'E', 0x20 + (ev), len)
uint ioctl = IOCreate(DirectionFlags.Read, (int)ev + 0x20, length);
int retval = Libc.ioctl(fd, ioctl, data);
return retval;
}

public static int GetName(int fd, out string name)
{
unsafe
{
sbyte* pname = stackalloc sbyte[129];
int ret = Libc.ioctl(fd, EvdevIoctl.Name128, new IntPtr(pname));
name = new string(pname);
return ret;
}
}

public static int GetId(int fd, out EvdevInputId id)
{
id = default(EvdevInputId);
unsafe
{
fixed (EvdevInputId* pid = &id)
{
return Libc.ioctl(fd, EvdevIoctl.Id, new IntPtr(pid));
}
}
}
}

enum EvdevButton : uint
enum EvdevAxis
{
X = 0x00,
Y = 0x01,
Z = 0x02,
RX = 0x03,
RY = 0x04,
RZ = 0x05,
THROTTLE = 0x06,
RUDDER = 0x07,
WHEEL = 0x08,
GAS = 0x09,
BRAKE = 0x0a,
HAT0X = 0x10,
HAT0Y = 0x11,
HAT1X = 0x12,
HAT1Y = 0x13,
HAT2X = 0x14,
HAT2Y = 0x15,
HAT3X = 0x16,
HAT3Y = 0x17,
PRESSURE = 0x18,
DISTANCE = 0x19,
TILT_X = 0x1a,
TILT_Y = 0x1b,
TOOL_WIDTH = 0x1c,

VOLUME = 0x20,

MISC = 0x28,

MT_SLOT = 0x2f, /* MT slot being modified */
MT_TOUCH_MAJOR = 0x30, /* Major axis of touching ellipse */
MT_TOUCH_MINOR = 0x31, /* Minor axis (omit if circular) */
MT_WIDTH_MAJOR = 0x32, /* Major axis of approaching ellipse */
MT_WIDTH_MINOR = 0x33, /* Minor axis (omit if circular) */
MT_ORIENTATION = 0x34, /* Ellipse orientation */
MT_POSITION_X = 0x35, /* Center X touch position */
MT_POSITION_Y = 0x36, /* Center Y touch position */
MT_TOOL_TYPE = 0x37, /* Type of touching device */
MT_BLOB_ID = 0x38, /* Group a set of packets as a blob */
MT_TRACKING_ID = 0x39, /* Unique ID of initiated contact */
MT_PRESSURE = 0x3a, /* Pressure on contact area */
MT_DISTANCE = 0x3b, /* Contact hover distance */
MT_TOOL_X = 0x3c, /* Center X tool position */
MT_TOOL_Y = 0x3d, /* Center Y tool position */

MAX = 0x3f,
CNT = (MAX+1),
}

enum EvdevButton
{
MISC = 0x100,
BTN0 = 0x100,
Expand Down Expand Up @@ -447,6 +561,75 @@ enum EvdevButton : uint
WHEEL = 0x150,
GEAR_DOWN = 0x150,
GEAR_UP = 0x151,

DPAD_UP = 0x220,
DPAD_DOWN = 0x221,
DPAD_LEFT = 0x222,
DPAD_RIGHT = 0x223,

Last = 0x300,
}

enum EvdevType : byte
{
SYN = 0x00,
KEY = 0x01,
REL = 0x02,
ABS = 0x03,
MSC = 0x04,
SW = 0x05,
LED = 0x11,
SND = 0x12,
REP = 0x14,
FF = 0x15,
PWR = 0x16,
FF_STATUS = 0x17,
MAX = 0x1f,
CNT = (MAX+1),
}

enum EvdevIoctl : uint
{
Id = (2u << 30) | ((byte)'E' << 8) | (0x02u << 0) | (8u << 16), //EVIOCGID = _IOR('E', 0x02, struct input_id)
Name128 = (2u << 30) | ((byte)'E' << 8) | (0x06u << 0) | (128u << 16), //EVIOCGNAME(len) = _IOC(_IOC_READ, 'E', 0x06, len)
}

[StructLayout(LayoutKind.Sequential)]
struct InputAbsInfo
{
public int Value;
public int Minimum;
public int Maximum;
public int Fuzz;
public int Flat;
public int Resolution;
};

[StructLayout(LayoutKind.Sequential)]
struct InputId
{
public ushort BusType;
public ushort Vendor;
public ushort Product;
public ushort Version;
}

[StructLayout(LayoutKind.Sequential)]
struct InputEvent
{
public TimeVal Time;
ushort type;
public ushort Code;
public int Value;

public EvdevType Type { get { return (EvdevType)type; } }
}

[StructLayout(LayoutKind.Sequential)]
struct TimeVal
{
public IntPtr Seconds;
public IntPtr MicroSeconds;
}
}

18 changes: 12 additions & 6 deletions Source/OpenTK/Platform/Linux/Bindings/Libc.cs
View file
Expand Up @@ -52,7 +52,10 @@ partial class Libc
public static extern int ioctl(int d, JoystickIoctlCode request, StringBuilder data);

[DllImport(lib)]
public static extern int ioctl(int d, EvdevIoctlCode request, out EvdevInputId data);
public static extern int ioctl(int d, EvdevIoctl request, [Out] IntPtr data);

[DllImport(lib)]
public static extern int ioctl(int d, uint request, [Out] IntPtr data);

[DllImport(lib)]
public static extern int ioctl(int d, KeyboardIoctlCode request, ref IntPtr data);
Expand Down Expand Up @@ -106,6 +109,14 @@ enum ErrorNumber
InvalidValue = 22,
}

[Flags]
enum DirectionFlags
{
None = 0,
Write = 1,
Read = 2
}

[Flags]
enum OpenFlags
{
Expand All @@ -116,11 +127,6 @@ enum OpenFlags
CloseOnExec = 0x0080000
}

enum EvdevIoctlCode : uint
{
Id = ((byte)'E' << 8) | (0x02 << 0) //EVIOCGID, which is _IOR('E', 0x02, struct input_id)
}

[Flags]
enum JoystickEventType : byte
{
Expand Down

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