Initial Contribution

1 files changed, 743 insertions, 0 deletions

diff --git a/libs/ui/EventHub.cpp b/libs/ui/EventHub.cpp
new file mode 100644
index 0000000..f0c77ba
--- /dev/null
+++ b/libs/ui/EventHub.cpp
@@ -0,0 +1,743 @@
+//
+// Copyright 2005 The Android Open Source Project
+//
+// Handle events, like key input and vsync.
+//
+// The goal is to provide an optimized solution for Linux, not an
+// implementation that works well across all platforms.  We expect
+// events to arrive on file descriptors, so that we can use a select()
+// select() call to sleep.
+//
+// We can't select() on anything but network sockets in Windows, so we
+// provide an alternative implementation of waitEvent for that platform.
+//
+#define LOG_TAG "EventHub"
+
+//#define LOG_NDEBUG 0
+
+#include <ui/EventHub.h>
+#include <hardware/power.h>
+
+#include <cutils/properties.h>
+#include <utils/IServiceManager.h>
+#include <utils/Log.h>
+#include <utils/Timers.h>
+#include <utils.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <memory.h>
+#include <errno.h>
+#include <assert.h>
+
+#include "KeyLayoutMap.h"
+
+#include <string.h>
+#include <stdint.h>
+#include <dirent.h>
+#ifdef HAVE_INOTIFY
+# include <sys/inotify.h>
+#endif
+#ifdef HAVE_ANDROID_OS
+# include <sys/limits.h>        /* not part of Linux */
+#endif
+#include <sys/poll.h>
+#include <sys/ioctl.h>
+
+/* this macro is used to tell if "bit" is set in "array"
+ * it selects a byte from the array, and does a boolean AND
+ * operation with a byte that only has the relevant bit set.
+ * eg. to check for the 12th bit, we do (array[1] & 1<<4)
+ */
+#define test_bit(bit, array)    (array[bit/8] & (1<<(bit%8)))
+
+#define ID_MASK  0x0000ffff
+#define SEQ_MASK 0x7fff0000
+#define SEQ_SHIFT 16
+#define id_to_index(id)         ((id&ID_MASK)+1)
+
+namespace android {
+
+static const char *WAKE_LOCK_ID = "KeyEvents";
+static const char *device_path = "/dev/input";
+
+/* return the larger integer */
+static inline int max(int v1, int v2)
+{
+    return (v1 > v2) ? v1 : v2;
+}
+
+EventHub::device_t::device_t(int32_t _id, const char* _path)
+    : id(_id), path(_path), classes(0)
+    , layoutMap(new KeyLayoutMap()), next(NULL) {
+}
+
+EventHub::device_t::~device_t() {
+    delete layoutMap;
+}
+
+EventHub::EventHub(void)
+    : mError(NO_INIT), mHaveFirstKeyboard(false), mFirstKeyboardId(0)
+    , mDevicesById(0), mNumDevicesById(0)
+    , mOpeningDevices(0), mClosingDevices(0)
+    , mDevices(0), mFDs(0), mFDCount(0)
+{
+    acquire_wake_lock(PARTIAL_WAKE_LOCK, WAKE_LOCK_ID);
+#ifdef EV_SW
+    memset(mSwitches, 0, sizeof(mSwitches));
+#endif
+}
+
+/*
+ * Clean up.
+ */
+EventHub::~EventHub(void)
+{
+    release_wake_lock(WAKE_LOCK_ID);
+    // we should free stuff here...
+}
+
+void EventHub::onFirstRef()
+{
+    mError = openPlatformInput() ? NO_ERROR : UNKNOWN_ERROR;
+}
+
+status_t EventHub::errorCheck() const
+{
+    return mError;
+}
+
+String8 EventHub::getDeviceName(int32_t deviceId) const
+{
+    AutoMutex _l(mLock);
+    device_t* device = getDevice(deviceId);
+    if (device == NULL) return String8();
+    return device->name;
+}
+
+uint32_t EventHub::getDeviceClasses(int32_t deviceId) const
+{
+    AutoMutex _l(mLock);
+    device_t* device = getDevice(deviceId);
+    if (device == NULL) return 0;
+    return device->classes;
+}
+
+int EventHub::getAbsoluteInfo(int32_t deviceId, int axis, int *outMinValue,
+        int* outMaxValue, int* outFlat, int* outFuzz) const
+{
+    AutoMutex _l(mLock);
+    device_t* device = getDevice(deviceId);
+    if (device == NULL) return -1;
+
+    struct input_absinfo info;
+
+    if(ioctl(mFDs[id_to_index(device->id)].fd, EVIOCGABS(axis), &info)) {
+        LOGE("Error reading absolute controller %d for device %s fd %d\n",
+             axis, device->name.string(), mFDs[id_to_index(device->id)].fd);
+        return -1;
+    }
+    *outMinValue = info.minimum;
+    *outMaxValue = info.maximum;
+    *outFlat = info.flat;
+    *outFuzz = info.fuzz;
+    return 0;
+}
+
+int EventHub::getSwitchState(int sw) const
+{
+#ifdef EV_SW
+    if (sw >= 0 && sw <= SW_MAX) {
+        int32_t devid = mSwitches[sw];
+        if (devid != 0) {
+            return getSwitchState(devid, sw);
+        }
+    }
+#endif
+    return -1;
+}
+
+int EventHub::getSwitchState(int32_t deviceId, int sw) const
+{
+#ifdef EV_SW
+    AutoMutex _l(mLock);
+    device_t* device = getDevice(deviceId);
+    if (device == NULL) return -1;
+    
+    if (sw >= 0 && sw <= SW_MAX) {
+        uint8_t sw_bitmask[(SW_MAX+1)/8];
+        memset(sw_bitmask, 0, sizeof(sw_bitmask));
+        if (ioctl(mFDs[id_to_index(device->id)].fd,
+                   EVIOCGSW(sizeof(sw_bitmask)), sw_bitmask) >= 0) {
+            return test_bit(sw, sw_bitmask) ? 1 : 0;
+        }
+    }
+#endif
+    
+    return -1;
+}
+
+int EventHub::getScancodeState(int code) const
+{
+    return getScancodeState(mFirstKeyboardId, code);
+}
+
+int EventHub::getScancodeState(int32_t deviceId, int code) const
+{
+    AutoMutex _l(mLock);
+    device_t* device = getDevice(deviceId);
+    if (device == NULL) return -1;
+    
+    if (code >= 0 && code <= KEY_MAX) {
+        uint8_t key_bitmask[(KEY_MAX+1)/8];
+        memset(key_bitmask, 0, sizeof(key_bitmask));
+        if (ioctl(mFDs[id_to_index(device->id)].fd,
+                   EVIOCGKEY(sizeof(key_bitmask)), key_bitmask) >= 0) {
+            return test_bit(code, key_bitmask) ? 1 : 0;
+        }
+    }
+    
+    return -1;
+}
+
+int EventHub::getKeycodeState(int code) const
+{
+    return getKeycodeState(mFirstKeyboardId, code);
+}
+
+int EventHub::getKeycodeState(int32_t deviceId, int code) const
+{
+    AutoMutex _l(mLock);
+    device_t* device = getDevice(deviceId);
+    if (device == NULL || device->layoutMap == NULL) return -1;
+    
+    Vector<int32_t> scanCodes;
+    device->layoutMap->findScancodes(code, &scanCodes);
+    
+    uint8_t key_bitmask[(KEY_MAX+1)/8];
+    memset(key_bitmask, 0, sizeof(key_bitmask));
+    if (ioctl(mFDs[id_to_index(device->id)].fd,
+               EVIOCGKEY(sizeof(key_bitmask)), key_bitmask) >= 0) {
+        #if 0
+        for (size_t i=0; i<=KEY_MAX; i++) {
+            LOGI("(Scan code %d: down=%d)", i, test_bit(i, key_bitmask));
+        }
+        #endif
+        const size_t N = scanCodes.size();
+        for (size_t i=0; i<N && i<=KEY_MAX; i++) {
+            int32_t sc = scanCodes.itemAt(i);
+            //LOGI("Code %d: down=%d", sc, test_bit(sc, key_bitmask));
+            if (sc >= 0 && sc <= KEY_MAX && test_bit(sc, key_bitmask)) {
+                return 1;
+            }
+        }
+    }
+    
+    return 0;
+}
+
+EventHub::device_t* EventHub::getDevice(int32_t deviceId) const
+{
+    if (deviceId == 0) deviceId = mFirstKeyboardId;
+    int32_t id = deviceId & ID_MASK;
+    if (id >= mNumDevicesById || id < 0) return NULL;
+    device_t* dev = mDevicesById[id].device;
+    if (dev->id == deviceId) {
+        return dev;
+    }
+    return NULL;
+}
+
+bool EventHub::getEvent(int32_t* outDeviceId, int32_t* outType,
+        int32_t* outScancode, int32_t* outKeycode, uint32_t *outFlags,
+        int32_t* outValue, nsecs_t* outWhen)
+{
+    *outDeviceId = 0;
+    *outType = 0;
+    *outScancode = 0;
+    *outKeycode = 0;
+    *outFlags = 0;
+    *outValue = 0;
+    *outWhen = 0;
+
+    status_t err;
+
+    fd_set readfds;
+    int maxFd = -1;
+    int cc;
+    int i;
+    int res;
+    int pollres;
+    struct input_event iev;
+
+    // Note that we only allow one caller to getEvent(), so don't need
+    // to do locking here...  only when adding/removing devices.
+    
+    while(1) {
+
+        // First, report any devices that had last been added/removed.
+        if (mClosingDevices != NULL) {
+            device_t* device = mClosingDevices;
+            LOGV("Reporting device closed: id=0x%x, name=%s\n",
+                 device->id, device->path.string());
+            mClosingDevices = device->next;
+            *outDeviceId = device->id;
+            if (*outDeviceId == mFirstKeyboardId) *outDeviceId = 0;
+            *outType = DEVICE_REMOVED;
+            delete device;
+            return true;
+        }
+        if (mOpeningDevices != NULL) {
+            device_t* device = mOpeningDevices;
+            LOGV("Reporting device opened: id=0x%x, name=%s\n",
+                 device->id, device->path.string());
+            mOpeningDevices = device->next;
+            *outDeviceId = device->id;
+            if (*outDeviceId == mFirstKeyboardId) *outDeviceId = 0;
+            *outType = DEVICE_ADDED;
+            return true;
+        }
+
+        release_wake_lock(WAKE_LOCK_ID);
+
+        pollres = poll(mFDs, mFDCount, -1);
+
+        acquire_wake_lock(PARTIAL_WAKE_LOCK, WAKE_LOCK_ID);
+
+        if (pollres <= 0) {
+            if (errno != EINTR) {
+                LOGW("select failed (errno=%d)\n", errno);
+                usleep(100000);
+            }
+            continue;
+        }
+
+        //printf("poll %d, returned %d\n", mFDCount, pollres);
+        if(mFDs[0].revents & POLLIN) {
+            read_notify(mFDs[0].fd);
+        }
+        for(i = 1; i < mFDCount; i++) {
+            if(mFDs[i].revents) {
+                LOGV("revents for %d = 0x%08x", i, mFDs[i].revents);
+                if(mFDs[i].revents & POLLIN) {
+                    res = read(mFDs[i].fd, &iev, sizeof(iev));
+                    if (res == sizeof(iev)) {
+                        LOGV("%s got: t0=%d, t1=%d, type=%d, code=%d, v=%d",
+                             mDevices[i]->path.string(),
+                             (int) iev.time.tv_sec, (int) iev.time.tv_usec,
+                             iev.type, iev.code, iev.value);
+                        *outDeviceId = mDevices[i]->id;
+                        if (*outDeviceId == mFirstKeyboardId) *outDeviceId = 0;
+                        *outType = iev.type;
+                        *outScancode = iev.code;
+                        if (iev.type == EV_KEY) {
+                            err = mDevices[i]->layoutMap->map(iev.code, outKeycode, outFlags);
+                            LOGV("iev.code=%d outKeycode=%d outFlags=0x%08x err=%d\n",
+                                iev.code, *outKeycode, *outFlags, err);
+                            if (err != 0) {
+                                *outKeycode = 0;
+                                *outFlags = 0;
+                            }
+                        } else {
+                            *outKeycode = iev.code;
+                        }
+                        *outValue = iev.value;
+                        *outWhen = s2ns(iev.time.tv_sec) + us2ns(iev.time.tv_usec);
+                        return true;
+                    } else {
+                        if (res<0) {
+                            LOGW("could not get event (errno=%d)", errno);
+                        } else {
+                            LOGE("could not get event (wrong size: %d)", res);
+                        }
+                        continue;
+                    }
+                }
+            }
+        }
+    }
+}
+
+/*
+ * Open the platform-specific input device.
+ */
+bool EventHub::openPlatformInput(void)
+{
+    /*
+     * Open platform-specific input device(s).
+     */
+    int res;
+
+    mFDCount = 1;
+    mFDs = (pollfd *)calloc(1, sizeof(mFDs[0]));
+    mDevices = (device_t **)calloc(1, sizeof(mDevices[0]));
+    mFDs[0].events = POLLIN;
+    mDevices[0] = NULL;
+#ifdef HAVE_INOTIFY
+    mFDs[0].fd = inotify_init();
+    res = inotify_add_watch(mFDs[0].fd, device_path, IN_DELETE | IN_CREATE);
+    if(res < 0) {
+        LOGE("could not add watch for %s, %s\n", device_path, strerror(errno));
+    }
+#else
+    /*
+     * The code in EventHub::getEvent assumes that mFDs[0] is an inotify fd.
+     * We allocate space for it and set it to something invalid.
+     */
+    mFDs[0].fd = -1;
+#endif
+
+    res = scan_dir(device_path);
+    if(res < 0) {
+        LOGE("scan dir failed for %s\n", device_path);
+        //open_device("/dev/input/event0");
+    }
+
+    return true;
+}
+
+// ----------------------------------------------------------------------------
+
+int EventHub::open_device(const char *deviceName)
+{
+    int version;
+    int fd;
+    struct pollfd *new_mFDs;
+    device_t **new_devices;
+    char **new_device_names;
+    char name[80];
+    char location[80];
+    char idstr[80];
+    struct input_id id;
+
+    LOGV("Opening device: %s", deviceName);
+
+    AutoMutex _l(mLock);
+    
+    fd = open(deviceName, O_RDWR);
+    if(fd < 0) {
+        LOGE("could not open %s, %s\n", deviceName, strerror(errno));
+        return -1;
+    }
+
+    if(ioctl(fd, EVIOCGVERSION, &version)) {
+        LOGE("could not get driver version for %s, %s\n", deviceName, strerror(errno));
+        return -1;
+    }
+    if(ioctl(fd, EVIOCGID, &id)) {
+        LOGE("could not get driver id for %s, %s\n", deviceName, strerror(errno));
+        return -1;
+    }
+    name[sizeof(name) - 1] = '\0';
+    location[sizeof(location) - 1] = '\0';
+    idstr[sizeof(idstr) - 1] = '\0';
+    if(ioctl(fd, EVIOCGNAME(sizeof(name) - 1), &name) < 1) {
+        //fprintf(stderr, "could not get device name for %s, %s\n", deviceName, strerror(errno));
+        name[0] = '\0';
+    }
+    if(ioctl(fd, EVIOCGPHYS(sizeof(location) - 1), &location) < 1) {
+        //fprintf(stderr, "could not get location for %s, %s\n", deviceName, strerror(errno));
+        location[0] = '\0';
+    }
+    if(ioctl(fd, EVIOCGUNIQ(sizeof(idstr) - 1), &idstr) < 1) {
+        //fprintf(stderr, "could not get idstring for %s, %s\n", deviceName, strerror(errno));
+        idstr[0] = '\0';
+    }
+
+    int devid = 0;
+    while (devid < mNumDevicesById) {
+        if (mDevicesById[devid].device == NULL) {
+            break;
+        }
+        devid++;
+    }
+    if (devid >= mNumDevicesById) {
+        device_ent* new_devids = (device_ent*)realloc(mDevicesById,
+                sizeof(mDevicesById[0]) * (devid + 1));
+        if (new_devids == NULL) {
+            LOGE("out of memory");
+            return -1;
+        }
+        mDevicesById = new_devids;
+        mNumDevicesById = devid+1;
+        mDevicesById[devid].device = NULL;
+        mDevicesById[devid].seq = 0;
+    }
+
+    mDevicesById[devid].seq = (mDevicesById[devid].seq+(1<<SEQ_SHIFT))&SEQ_MASK;
+    if (mDevicesById[devid].seq == 0) {
+        mDevicesById[devid].seq = 1<<SEQ_SHIFT;
+    }
+
+    new_mFDs = (pollfd*)realloc(mFDs, sizeof(mFDs[0]) * (mFDCount + 1));
+    new_devices = (device_t**)realloc(mDevices, sizeof(mDevices[0]) * (mFDCount + 1));
+    if (new_mFDs == NULL || new_devices == NULL) {
+        LOGE("out of memory");
+        return -1;
+    }
+    mFDs = new_mFDs;
+    mDevices = new_devices;
+
+#if 0
+    LOGI("add device %d: %s\n", mFDCount, deviceName);
+    LOGI("  bus:      %04x\n"
+         "  vendor    %04x\n"
+         "  product   %04x\n"
+         "  version   %04x\n",
+        id.bustype, id.vendor, id.product, id.version);
+    LOGI("  name:     \"%s\"\n", name);
+    LOGI("  location: \"%s\"\n"
+         "  id:       \"%s\"\n", location, idstr);
+    LOGI("  version:  %d.%d.%d\n",
+        version >> 16, (version >> 8) & 0xff, version & 0xff);
+#endif
+
+    device_t* device = new device_t(devid|mDevicesById[devid].seq, deviceName);
+    if (device == NULL) {
+        LOGE("out of memory");
+        return -1;
+    }
+
+    mFDs[mFDCount].fd = fd;
+    mFDs[mFDCount].events = POLLIN;
+
+    // figure out the kinds of events the device reports
+    uint8_t key_bitmask[(KEY_MAX+1)/8];
+    memset(key_bitmask, 0, sizeof(key_bitmask));
+    LOGV("Getting keys...");
+    if (ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(key_bitmask)), key_bitmask) >= 0) {
+        //LOGI("MAP\n");
+        //for (int i=0; i<((KEY_MAX+1)/8); i++) {
+        //    LOGI("%d: 0x%02x\n", i, key_bitmask[i]);
+        //}
+        for (int i=0; i<((BTN_MISC+7)/8); i++) {
+            if (key_bitmask[i] != 0) {
+                device->classes |= CLASS_KEYBOARD;
+                break;
+            }
+        }
+    }
+    if (test_bit(BTN_MOUSE, key_bitmask)) {
+        uint8_t rel_bitmask[(REL_MAX+1)/8];
+        memset(rel_bitmask, 0, sizeof(rel_bitmask));
+        LOGV("Getting relative controllers...");
+        if (ioctl(fd, EVIOCGBIT(EV_REL, sizeof(rel_bitmask)), rel_bitmask) >= 0)
+        {
+            if (test_bit(REL_X, rel_bitmask) && test_bit(REL_Y, rel_bitmask)) {
+                device->classes |= CLASS_TRACKBALL;
+            }
+        }
+    }
+    if (test_bit(BTN_TOUCH, key_bitmask)) {
+        uint8_t abs_bitmask[(ABS_MAX+1)/8];
+        memset(abs_bitmask, 0, sizeof(abs_bitmask));
+        LOGV("Getting absolute controllers...");
+        if (ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(abs_bitmask)), abs_bitmask) >= 0)
+        {
+            if (test_bit(ABS_X, abs_bitmask) && test_bit(ABS_Y, abs_bitmask)) {
+                device->classes |= CLASS_TOUCHSCREEN;
+            }
+        }
+    }
+
+#ifdef EV_SW
+    // figure out the switches this device reports
+    uint8_t sw_bitmask[(SW_MAX+1)/8];
+    memset(sw_bitmask, 0, sizeof(sw_bitmask));
+    if (ioctl(fd, EVIOCGBIT(EV_SW, sizeof(sw_bitmask)), sw_bitmask) >= 0) {
+        for (int i=0; i<EV_SW; i++) {
+            //LOGI("Device 0x%x sw %d: has=%d", device->id, i, test_bit(i, sw_bitmask));
+            if (test_bit(i, sw_bitmask)) {
+                if (mSwitches[i] == 0) {
+                    mSwitches[i] = device->id;
+                }
+            }
+        }
+    }
+#endif
+
+    LOGI("New device: path=%s name=%s id=0x%x (of 0x%x) index=%d fd=%d classes=0x%x\n",
+         deviceName, name, device->id, mNumDevicesById, mFDCount, fd, device->classes);
+
+    if ((device->classes&CLASS_KEYBOARD) != 0) {
+        char devname[101];
+        char tmpfn[101];
+        char keylayoutFilename[300];
+
+        // a more descriptive name
+        ioctl(mFDs[mFDCount].fd, EVIOCGNAME(sizeof(devname)-1), devname);
+        devname[sizeof(devname)-1] = 0;
+        device->name = devname;
+
+        // replace all the spaces with underscores
+        strcpy(tmpfn, devname);
+        for (char *p = strchr(tmpfn, ' '); p && *p; p = strchr(tmpfn, ' '))
+            *p = '_';
+
+        // find the .kl file we need for this device
+        const char* root = getenv("ANDROID_ROOT");
+        snprintf(keylayoutFilename, sizeof(keylayoutFilename),
+                 "%s/usr/keylayout/%s.kl", root, tmpfn);
+        bool defaultKeymap = false;
+        if (access(keylayoutFilename, R_OK)) {
+            snprintf(keylayoutFilename, sizeof(keylayoutFilename),
+                     "%s/usr/keylayout/%s", root, "qwerty.kl");
+            defaultKeymap = true;
+        }
+        device->layoutMap->load(keylayoutFilename);
+
+        // tell the world about the devname (the descriptive name)
+        int32_t publicID;
+        if (!mHaveFirstKeyboard && !defaultKeymap) {
+            publicID = 0;
+            // the built-in keyboard has a well-known device ID of 0,
+            // this device better not go away.
+            mHaveFirstKeyboard = true;
+            mFirstKeyboardId = device->id;
+        } else {
+            publicID = device->id;
+            // ensure mFirstKeyboardId is set to -something-.
+            if (mFirstKeyboardId == 0) {
+                mFirstKeyboardId = device->id;
+            }
+        }
+        char propName[100];
+        sprintf(propName, "hw.keyboards.%u.devname", publicID);
+        property_set(propName, devname);
+
+        LOGI("New keyboard: publicID=%d device->id=%d devname='%s propName='%s' keylayout='%s'\n",
+                publicID, device->id, devname, propName, keylayoutFilename);
+    }
+
+    LOGV("Adding device %s %p at %d, id = %d, classes = 0x%x\n",
+         deviceName, device, mFDCount, devid, device->classes);
+
+    mDevicesById[devid].device = device;
+    device->next = mOpeningDevices;
+    mOpeningDevices = device;
+    mDevices[mFDCount] = device;
+
+    mFDCount++;
+    return 0;
+}
+
+int EventHub::close_device(const char *deviceName)
+{
+    AutoMutex _l(mLock);
+    
+    int i;
+    for(i = 1; i < mFDCount; i++) {
+        if(strcmp(mDevices[i]->path.string(), deviceName) == 0) {
+            //LOGD("remove device %d: %s\n", i, deviceName);
+            device_t* device = mDevices[i];
+            int count = mFDCount - i - 1;
+            int index = (device->id&ID_MASK);
+            mDevicesById[index].device = NULL;
+            memmove(mDevices + i, mDevices + i + 1, sizeof(mDevices[0]) * count);
+            memmove(mFDs + i, mFDs + i + 1, sizeof(mFDs[0]) * count);
+
+#ifdef EV_SW
+            for (int j=0; j<EV_SW; j++) {
+                if (mSwitches[j] == device->id) {
+                    mSwitches[j] = 0;
+                }
+            }
+#endif
+            
+            device->next = mClosingDevices;
+            mClosingDevices = device;
+
+            mFDCount--;
+
+            uint32_t publicID;
+            if (device->id == mFirstKeyboardId) {
+                LOGW("built-in keyboard device %s (id=%d) is closing! the apps will not like this",
+                        device->path.string(), mFirstKeyboardId);
+                mFirstKeyboardId = 0;
+                publicID = 0;
+            } else {
+                publicID = device->id;
+            }
+            // clear the property
+            char propName[100];
+            sprintf(propName, "hw.keyboards.%u.devname", publicID);
+            property_set(propName, NULL);
+            return 0;
+        }
+    }
+    LOGE("remote device: %s not found\n", deviceName);
+    return -1;
+}
+
+int EventHub::read_notify(int nfd)
+{
+#ifdef HAVE_INOTIFY
+    int res;
+    char devname[PATH_MAX];
+    char *filename;
+    char event_buf[512];
+    int event_size;
+    int event_pos = 0;
+    struct inotify_event *event;
+
+    res = read(nfd, event_buf, sizeof(event_buf));
+    if(res < (int)sizeof(*event)) {
+        if(errno == EINTR)
+            return 0;
+        LOGW("could not get event, %s\n", strerror(errno));
+        return 1;
+    }
+    //printf("got %d bytes of event information\n", res);
+
+    strcpy(devname, device_path);
+    filename = devname + strlen(devname);
+    *filename++ = '/';
+
+    while(res >= (int)sizeof(*event)) {
+        event = (struct inotify_event *)(event_buf + event_pos);
+        //printf("%d: %08x \"%s\"\n", event->wd, event->mask, event->len ? event->name : "");
+        if(event->len) {
+            strcpy(filename, event->name);
+            if(event->mask & IN_CREATE) {
+                open_device(devname);
+            }
+            else {
+                close_device(devname);
+            }
+        }
+        event_size = sizeof(*event) + event->len;
+        res -= event_size;
+        event_pos += event_size;
+    }
+#endif
+    return 0;
+}
+
+
+int EventHub::scan_dir(const char *dirname)
+{
+    char devname[PATH_MAX];
+    char *filename;
+    DIR *dir;
+    struct dirent *de;
+    dir = opendir(dirname);
+    if(dir == NULL)
+        return -1;
+    strcpy(devname, dirname);
+    filename = devname + strlen(devname);
+    *filename++ = '/';
+    while((de = readdir(dir))) {
+        if(de->d_name[0] == '.' &&
+           (de->d_name[1] == '\0' ||
+            (de->d_name[1] == '.' && de->d_name[2] == '\0')))
+            continue;
+        strcpy(filename, de->d_name);
+        open_device(devname);
+    }
+    closedir(dir);
+    return 0;
+}
+
+}; // namespace android