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Linux: Move to evdev for joystick input

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Closes #1005.
This commit is contained in:
Anthony Pesch 2017-05-06 16:34:56 -04:00 committed by Camilla Löwy
parent 78666204a1
commit d1a2ec4d20
2 changed files with 143 additions and 30 deletions
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156
src/linux_joystick.c
View File

@ -27,8 +27,6 @@
#include "internal.h"
#include <linux/joystick.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/inotify.h>
@ -40,15 +38,93 @@
#include <string.h>
#include <unistd.h>
#define NUM_BITS(size) ((size) / 8)
#define TEST_BIT(bit, arr) (arr[(bit) / 8] & (1 << ((bit) % 8)))
static void handleKeyEvent(_GLFWjoystick* js, int code, int value)
{
int jid = js - _glfw.joysticks;
int button = js->linjs.keyMap[code];
_glfwInputJoystickButton(jid, button, value ? 1 : 0);
}
static void handleAbsEvent(_GLFWjoystick* js, int code, int value)
{
int jid = js - _glfw.joysticks;
int index = js->linjs.absMap[code];
if (code >= ABS_HAT0X && code <= ABS_HAT3Y)
{
static const char stateMap[3][3] =
{
{GLFW_HAT_CENTERED, GLFW_HAT_UP, GLFW_HAT_DOWN},
{GLFW_HAT_LEFT, GLFW_HAT_LEFT_UP, GLFW_HAT_LEFT_DOWN},
{GLFW_HAT_RIGHT, GLFW_HAT_RIGHT_UP, GLFW_HAT_RIGHT_DOWN},
};
int hat = (code - ABS_HAT0X) / 2;
int axis = (code - ABS_HAT0X) % 2;
int *state = js->linjs.hats[hat];
// Looking at several input drivers, it seems all hat events use
// -1 for left / up, 0 for centered and 1 for right / down
if (value == 0)
state[axis] = 0;
else if (value < 0)
state[axis] = 1;
else if (value > 0)
state[axis] = 2;
_glfwInputJoystickHat(jid, index, stateMap[state[0]][state[1]]);
}
else
{
struct input_absinfo *info = &js->linjs.absInfo[code];
int range = info->maximum - info->minimum;
float normalized = value;
if (range != 0)
{
// Normalize from 0.0 -> 1.0
normalized = (normalized - info->minimum) / range;
// Normalize from -1.0 -> 1.0
normalized = normalized * 2.0f - 1.0f;
}
_glfwInputJoystickAxis(jid, index, normalized);
}
}
static void pollJoystick(_GLFWjoystick* js)
{
int i;
for (i = ABS_X; i < ABS_MAX; i++)
{
struct input_absinfo *info = &js->linjs.absInfo[i];
if (ioctl(js->linjs.fd, EVIOCGABS(i), info) < 0)
continue;
handleAbsEvent(js, i, info->value);
}
}
// Attempt to open the specified joystick device
//
static GLFWbool openJoystickDevice(const char* path)
{
char axisCount, buttonCount;
int jid, fd, i;
char name[256] = "";
int jid, fd, version;
_GLFWjoystick* js;
char evBits[NUM_BITS(EV_MAX)] = {0};
char keyBits[NUM_BITS(KEY_MAX)] = {0};
char absBits[NUM_BITS(ABS_MAX)] = {0};
int axisCount = 0;
int buttonCount = 0;
int hatCount = 0;
_GLFWjoystickLinux linjs = {0};
_GLFWjoystick* js = NULL;
for (jid = 0; jid <= GLFW_JOYSTICK_LAST; jid++)
{
@ -62,30 +138,61 @@ static GLFWbool openJoystickDevice(const char* path)
if (fd == -1)
return GLFW_FALSE;
// Verify that the joystick driver version is at least 1.0
ioctl(fd, JSIOCGVERSION, &version);
if (version < 0x010000)
// Ensure this device supports the events expected of a joystick
if (ioctl(fd, EVIOCGBIT(0, sizeof(evBits)), evBits) < 0 ||
ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keyBits)), keyBits) < 0 ||
ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(absBits)), absBits) < 0 ||
!TEST_BIT(EV_KEY, evBits) || !TEST_BIT(EV_ABS, evBits))
{
// It's an old 0.x interface (we don't support it)
close(fd);
return GLFW_FALSE;
}
if (ioctl(fd, JSIOCGNAME(sizeof(name)), name) < 0)
if (ioctl(fd, EVIOCGNAME(sizeof(name)), name) < 0)
strncpy(name, "Unknown", sizeof(name));
ioctl(fd, JSIOCGAXES, &axisCount);
ioctl(fd, JSIOCGBUTTONS, &buttonCount);
for (i = BTN_MISC; i < KEY_MAX; i++)
{
if (!TEST_BIT(i, keyBits))
continue;
js = _glfwAllocJoystick(name, axisCount, buttonCount, 0);
linjs.keyMap[i] = buttonCount++;
}
for (i = ABS_X; i < ABS_MAX; i++)
{
if (!TEST_BIT(i, absBits))
continue;
if (i >= ABS_HAT0X && i <= ABS_HAT3Y)
{
linjs.absMap[i] = hatCount++;
// Skip the Y axis
i++;
}
else
{
if (ioctl(fd, EVIOCGABS(i), &linjs.absInfo[i]) < 0)
continue;
linjs.absMap[i] = axisCount++;
}
}
js = _glfwAllocJoystick(name, axisCount, buttonCount, hatCount);
if (!js)
{
close(fd);
return GLFW_FALSE;
}
js->linjs.path = strdup(path);
js->linjs.fd = fd;
linjs.fd = fd;
strncpy(linjs.path, path, sizeof(linjs.path));
memcpy(&js->linjs, &linjs, sizeof(linjs));
// Set initial values for absolute axes
pollJoystick(js);
_glfwInputJoystick(_GLFW_JOYSTICK_ID(js), GLFW_CONNECTED);
return GLFW_TRUE;
@ -96,7 +203,6 @@ static GLFWbool openJoystickDevice(const char* path)
static void closeJoystick(_GLFWjoystick* js)
{
close(js->linjs.fd);
free(js->linjs.path);
_glfwFreeJoystick(js);
_glfwInputJoystick(_GLFW_JOYSTICK_ID(js), GLFW_DISCONNECTED);
}
@ -147,7 +253,7 @@ GLFWbool _glfwInitJoysticksLinux(void)
// Continue without device connection notifications
}
if (regcomp(&_glfw.linjs.regex, "^js[0-9]\\+$", 0) != 0)
if (regcomp(&_glfw.linjs.regex, "^event[0-9]\\+$", 0) != 0)
{
_glfwInputError(GLFW_PLATFORM_ERROR, "Linux: Failed to compile regex");
return GLFW_FALSE;
@ -265,7 +371,7 @@ int _glfwPlatformPollJoystick(int jid, int mode)
// Read all queued events (non-blocking)
for (;;)
{
struct js_event e;
struct input_event e;
errno = 0;
if (read(js->linjs.fd, &e, sizeof(e)) < 0)
@ -277,13 +383,13 @@ int _glfwPlatformPollJoystick(int jid, int mode)
break;
}
// Clear the initial-state bit
e.type &= ~JS_EVENT_INIT;
if (e.type == JS_EVENT_AXIS)
_glfwInputJoystickAxis(jid, e.number, e.value / 32767.0f);
else if (e.type == JS_EVENT_BUTTON)
_glfwInputJoystickButton(jid, e.number, e.value ? 1 : 0);
if (e.type == EV_KEY)
handleKeyEvent(js, e.code, e.value);
else if (e.type == EV_ABS)
handleAbsEvent(js, e.code, e.value);
else if (e.type == EV_SYN && e.code == SYN_DROPPED)
// Refresh axes
pollJoystick(js);
}
return js->present;

17
src/linux_joystick.h
View File

@ -24,27 +24,34 @@
//
//========================================================================
#include <linux/input.h>
#include <linux/limits.h>
#include <regex.h>
#define _GLFW_PLATFORM_JOYSTICK_STATE _GLFWjoystickLinux linjs
#define _GLFW_PLATFORM_LIBRARY_JOYSTICK_STATE _GLFWlibraryLinux linjs
#define HATS_MAX ((ABS_HAT3Y - ABS_HAT0X) / 2)
// Linux-specific joystick data
//
typedef struct _GLFWjoystickLinux
{
int fd;
char* path;
int fd;
char path[PATH_MAX];
int keyMap[KEY_MAX];
int absMap[ABS_MAX];
struct input_absinfo absInfo[ABS_MAX];
int hats[HATS_MAX][2];
} _GLFWjoystickLinux;
// Linux-specific joystick API data
//
typedef struct _GLFWlibraryLinux
{
int inotify;
int watch;
regex_t regex;
int inotify;
int watch;
regex_t regex;
} _GLFWlibraryLinux;