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net_java_games_input_LinuxEventDevice.c

/*
 * %W% %E%
 *
 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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* Copyright (c) 2003 Sun Microsystems, Inc.  All Rights Reserved.
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* modification, are permitted provided that the following conditions are met:
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* - Redistribution of source code must retain the above copyright notice,
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#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <linux/input.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include "util.h"
#include "net_java_games_input_LinuxEventDevice.h"

JNIEXPORT jlong JNICALL Java_net_java_games_input_LinuxEventDevice_nOpen(JNIEnv *env, jclass unused, jstring path, jboolean rw_flag) {
      const char *path_str = (*env)->GetStringUTFChars(env, path, NULL);
      if (path_str == NULL)
            return -1;
      int flags = rw_flag == JNI_TRUE ? O_RDWR : O_RDONLY;
      flags = flags | O_NONBLOCK;
      int fd = open(path_str, flags);
      if (fd == -1)
            throwIOException(env, "Failed to open device %s (%d)\n", path_str, errno);
      (*env)->ReleaseStringUTFChars(env, path, path_str);
      return fd;
}

JNIEXPORT void JNICALL Java_net_java_games_input_LinuxEventDevice_nClose(JNIEnv *env, jclass unused, jlong fd_address) {
      int fd = (int)fd_address;
      int result = close(fd);
      if (result == -1)
            throwIOException(env, "Failed to close device (%d)\n", errno);
}

JNIEXPORT jstring JNICALL Java_net_java_games_input_LinuxEventDevice_nGetName(JNIEnv *env, jclass unused, jlong fd_address) {
#define BUFFER_SIZE 1024
      int fd = (int)fd_address;
      char device_name[BUFFER_SIZE];
      
      if (ioctl(fd, EVIOCGNAME(BUFFER_SIZE), device_name) == -1) {
            throwIOException(env, "Failed to get device name (%d)\n", errno);
            return NULL;
      }
      jstring jstr = (*env)->NewStringUTF(env, device_name);
      return jstr;
}

JNIEXPORT void JNICALL Java_net_java_games_input_LinuxEventDevice_nGetKeyStates(JNIEnv *env, jclass unused, jlong fd_address, jbyteArray bits_array) {
      int fd = (int)fd_address;
      jsize len = (*env)->GetArrayLength(env, bits_array);
      jbyte *bits = (*env)->GetByteArrayElements(env, bits_array, NULL);
      if (bits == NULL)
            return;
      int res = ioctl(fd, EVIOCGKEY(len), bits);
      (*env)->ReleaseByteArrayElements(env, bits_array, bits, 0);
      if (res == -1)
            throwIOException(env, "Failed to get device key states (%d)\n", errno);
}

JNIEXPORT jint JNICALL Java_net_java_games_input_LinuxEventDevice_nGetVersion(JNIEnv *env, jclass unused, jlong fd_address) {
      int fd = (int)fd_address;
      int version;
      if (ioctl(fd, EVIOCGVERSION, &version) == -1) {
            throwIOException(env, "Failed to get device version (%d)\n", errno);
            return -1;
      }
      return version;
}

JNIEXPORT jint JNICALL Java_net_java_games_input_LinuxEventDevice_nGetNumEffects(JNIEnv *env, jclass unused, jlong fd_address) {
      int fd = (int)fd_address;
      int num_effects;
      if (ioctl(fd, EVIOCGEFFECTS, &num_effects) == -1) {
            throwIOException(env, "Failed to get number of device effects (%d)\n", errno);
            return -1;
      }
      return num_effects;
}

JNIEXPORT void JNICALL Java_net_java_games_input_LinuxEventDevice_nGetDeviceUsageBits(JNIEnv *env, jclass unused, jlong fd_address, jbyteArray usages_array) {
#if EV_VERSION >= 0x010001
      int fd = (int)fd_address;
      jsize len = (*env)->GetArrayLength(env, usages_array);
      jbyte *usages = (*env)->GetByteArrayElements(env, usages_array, NULL);
      if (usages == NULL)
            return;
      int res = ioctl(fd, EVIOCGUSAGE(len), usages);
      (*env)->ReleaseByteArrayElements(env, usages_array, usages, 0);
      if (res == -1)
            throwIOException(env, "Failed to get device usages (%d)\n", errno);
#endif
}

JNIEXPORT void JNICALL Java_net_java_games_input_LinuxEventDevice_nGetBits(JNIEnv *env, jclass unused, jlong fd_address, jint evtype, jbyteArray bits_array) {
      int fd = (int)fd_address;
      jsize len = (*env)->GetArrayLength(env, bits_array);
      jbyte *bits = (*env)->GetByteArrayElements(env, bits_array, NULL);
      if (bits == NULL)
            return;
      int res = ioctl(fd, EVIOCGBIT(evtype, len), bits);
      (*env)->ReleaseByteArrayElements(env, bits_array, bits, 0);
      if (res == -1)
            throwIOException(env, "Failed to get device bits (%d)\n", errno);
}

JNIEXPORT jobject JNICALL Java_net_java_games_input_LinuxEventDevice_nGetInputID(JNIEnv *env, jclass unused, jlong fd_address) {
      int fd = (int)fd_address;
      jclass input_id_class = (*env)->FindClass(env, "net/java/games/input/LinuxInputID");
      if (input_id_class == NULL)
            return NULL;
      jmethodID input_id_constructor = (*env)->GetMethodID(env, input_id_class, "<init>", "(IIII)V");
      if (input_id_constructor == NULL)
            return NULL;
      struct input_id id;
      int result = ioctl(fd, EVIOCGID, &id);
      if (result == -1) {
            throwIOException(env, "Failed to get input id for device (%d)\n", errno);
            return NULL;
      }
      return (*env)->NewObject(env, input_id_class, input_id_constructor, (jint)id.bustype, (jint)id.vendor, (jint)id.product, (jint)id.version);
}

JNIEXPORT void JNICALL Java_net_java_games_input_LinuxEventDevice_nGetAbsInfo(JNIEnv *env, jclass unused, jlong fd_address, jint abs_axis, jobject abs_info_return) {
      int fd = (int)fd_address;
      jclass abs_info_class = (*env)->GetObjectClass(env, abs_info_return);
      if (abs_info_class == NULL)
            return;
      jmethodID abs_info_set = (*env)->GetMethodID(env, abs_info_class, "set", "(IIIII)V");
      if (abs_info_set == NULL)
            return;
      struct input_absinfo abs_info;
      int result = ioctl(fd, EVIOCGABS(abs_axis), &abs_info);
      if (result == -1) {
            throwIOException(env, "Failed to get abs info for axis (%d)\n", errno);
            return;
      }
      (*env)->CallVoidMethod(env, abs_info_return, abs_info_set, (jint)abs_info.value, (jint)abs_info.minimum, (jint)abs_info.maximum, (jint)abs_info.fuzz, (jint)abs_info.flat);
}

JNIEXPORT jboolean JNICALL Java_net_java_games_input_LinuxEventDevice_nGetNextEvent(JNIEnv *env, jclass unused, jlong fd_address, jobject linux_event_return) {
      int fd = (int)fd_address;
      jclass linux_event_class = (*env)->GetObjectClass(env, linux_event_return);
      if (linux_event_class == NULL)
            return JNI_FALSE;
      jmethodID linux_event_set = (*env)->GetMethodID(env, linux_event_class, "set", "(JJIII)V");
      if (linux_event_set == NULL)
            return JNI_FALSE;
      struct input_event event;
      if (read(fd, &event, sizeof(struct input_event)) == -1) {
            if (errno == EAGAIN)
                  return JNI_FALSE;
            throwIOException(env, "Failed to read next device event (%d)\n", errno);
            return JNI_FALSE;
      }
      (*env)->CallVoidMethod(env, linux_event_return, linux_event_set, (jlong)event.time.tv_sec, (jlong)event.time.tv_usec, (jint)event.type, (jint)event.code, (jint)event.value);
      return JNI_TRUE;
}

JNIEXPORT jint JNICALL Java_net_java_games_input_LinuxEventDevice_nUploadRumbleEffect(JNIEnv *env, jclass unused, jlong fd_address, jint id, jint direction, jint trigger_button, jint trigger_interval, jint replay_length, jint replay_delay, jint strong_magnitude, jint weak_magnitude) {
      int fd = (int)fd_address;
      struct ff_effect effect;

      effect.type = FF_RUMBLE;
      effect.id = id;
      effect.trigger.button = trigger_button;
      effect.trigger.interval = trigger_interval;
      effect.replay.length = replay_length;
      effect.replay.delay = replay_delay;
      effect.direction = direction;
      effect.u.rumble.strong_magnitude = strong_magnitude;
      effect.u.rumble.weak_magnitude = weak_magnitude;

      if (ioctl(fd, EVIOCSFF, &effect) == -1) {
            throwIOException(env, "Failed to upload effect (%d)\n", errno);
            return -1;
      }
      return effect.id;
}

JNIEXPORT jint JNICALL Java_net_java_games_input_LinuxEventDevice_nUploadConstantEffect(JNIEnv *env, jclass unused, jlong fd_address, jint id, jint direction, jint trigger_button, jint trigger_interval, jint replay_length, jint replay_delay, jint constant_level, jint constant_env_attack_length, jint constant_env_attack_level, jint constant_env_fade_length, jint constant_env_fade_level) {
      int fd = (int)fd_address;
      struct ff_effect effect;

      effect.type = FF_CONSTANT;
      effect.id = id;
      effect.trigger.button = trigger_button;
      effect.trigger.interval = trigger_interval;
      effect.replay.length = replay_length;
      effect.replay.delay = replay_delay;
      effect.direction = direction;
      effect.u.constant.level = constant_level;
      effect.u.constant.envelope.attack_length = constant_env_attack_length;
      effect.u.constant.envelope.attack_level = constant_env_attack_level;
      effect.u.constant.envelope.fade_length = constant_env_fade_length;
      effect.u.constant.envelope.fade_level = constant_env_fade_level;

      if (ioctl(fd, EVIOCSFF, &effect) == -1) {
            throwIOException(env, "Failed to upload effect (%d)\n", errno);
            return -1;
      }
      return effect.id;
}

JNIEXPORT void JNICALL Java_net_java_games_input_LinuxEventDevice_nWriteEvent(JNIEnv *env, jclass unused, jlong fd_address, jint type, jint code, jint value) {
      int fd = (int)fd_address;
      struct input_event event;
      event.type = type;
      event.code = code;
      event.value = value;

      if (write(fd, &event, sizeof(event)) == -1) {
            throwIOException(env, "Failed to write to device (%d)\n", errno);
      }
}

JNIEXPORT void JNICALL Java_net_java_games_input_LinuxEventDevice_nEraseEffect(JNIEnv *env, jclass unused, jlong fd_address, jint ff_id) {
      int fd = (int)fd_address;
      int ff_id_int = ff_id;

      if (ioctl(fd, EVIOCRMFF, &ff_id_int) == -1)
            throwIOException(env, "Failed to erase effect (%d)\n", errno);
}

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