Adding feature: input device disable/enable
This functionality will only be available for signed system
services. A disable call will cause a file descriptor to the input
device driver to be closed, which in turn may cause the input
device to switch into a low-power mode. An enable call will
reopen the input device.
Bug: 30143923
Test: CTS test - android.view.cts.InputDeviceEnabledTest
Native test - WhenEnabledChanges_SendsDeviceResetNotification,
WhenDeviceCreated_EnabledIsTrue. Also developed a custom apk
with signature permission that calls disable/enable on a
touchscreen device. Verified that touchscreen stops working
when disable is called and starts working again when
enable is called. Verified that the file
handle to the driver is closed and reopened. Verified that
the notification onInputDeviceChanged is received in the
app.
Change-Id: I99a7866cebff873dc1848e11a39045ed2eaec07c
diff --git a/services/inputflinger/EventHub.cpp b/services/inputflinger/EventHub.cpp
index d2f8995..50589b4 100644
--- a/services/inputflinger/EventHub.cpp
+++ b/services/inputflinger/EventHub.cpp
@@ -150,7 +150,8 @@
fd(fd), id(id), path(path), identifier(identifier),
classes(0), configuration(NULL), virtualKeyMap(NULL),
ffEffectPlaying(false), ffEffectId(-1), controllerNumber(0),
- timestampOverrideSec(0), timestampOverrideUsec(0) {
+ timestampOverrideSec(0), timestampOverrideUsec(0), enabled(true),
+ isVirtual(fd < 0) {
memset(keyBitmask, 0, sizeof(keyBitmask));
memset(absBitmask, 0, sizeof(absBitmask));
memset(relBitmask, 0, sizeof(relBitmask));
@@ -173,6 +174,25 @@
}
}
+status_t EventHub::Device::enable() {
+ fd = open(path, O_RDWR | O_CLOEXEC | O_NONBLOCK);
+ if(fd < 0) {
+ ALOGE("could not open %s, %s\n", path.string(), strerror(errno));
+ return -errno;
+ }
+ enabled = true;
+ return OK;
+}
+
+status_t EventHub::Device::disable() {
+ close();
+ enabled = false;
+ return OK;
+}
+
+bool EventHub::Device::hasValidFd() {
+ return !isVirtual && enabled;
+}
// --- EventHub ---
@@ -286,7 +306,7 @@
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
- if (device && !device->isVirtual() && test_bit(axis, device->absBitmask)) {
+ if (device && device->hasValidFd() && test_bit(axis, device->absBitmask)) {
struct input_absinfo info;
if(ioctl(device->fd, EVIOCGABS(axis), &info)) {
ALOGW("Error reading absolute controller %d for device %s fd %d, errno=%d",
@@ -337,7 +357,7 @@
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
- if (device && !device->isVirtual() && test_bit(scanCode, device->keyBitmask)) {
+ if (device && device->hasValidFd() && test_bit(scanCode, device->keyBitmask)) {
uint8_t keyState[sizeof_bit_array(KEY_MAX + 1)];
memset(keyState, 0, sizeof(keyState));
if (ioctl(device->fd, EVIOCGKEY(sizeof(keyState)), keyState) >= 0) {
@@ -352,7 +372,7 @@
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
- if (device && !device->isVirtual() && device->keyMap.haveKeyLayout()) {
+ if (device && device->hasValidFd() && device->keyMap.haveKeyLayout()) {
Vector<int32_t> scanCodes;
device->keyMap.keyLayoutMap->findScanCodesForKey(keyCode, &scanCodes);
if (scanCodes.size() != 0) {
@@ -377,7 +397,7 @@
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
- if (device && !device->isVirtual() && test_bit(sw, device->swBitmask)) {
+ if (device && device->hasValidFd() && test_bit(sw, device->swBitmask)) {
uint8_t swState[sizeof_bit_array(SW_MAX + 1)];
memset(swState, 0, sizeof(swState));
if (ioctl(device->fd, EVIOCGSW(sizeof(swState)), swState) >= 0) {
@@ -395,7 +415,7 @@
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
- if (device && !device->isVirtual() && test_bit(axis, device->absBitmask)) {
+ if (device && device->hasValidFd() && test_bit(axis, device->absBitmask)) {
struct input_absinfo info;
if(ioctl(device->fd, EVIOCGABS(axis), &info)) {
ALOGW("Error reading absolute controller %d for device %s fd %d, errno=%d",
@@ -532,7 +552,7 @@
void EventHub::setLedStateLocked(Device* device, int32_t led, bool on) {
int32_t sc;
- if (device && !device->isVirtual() && mapLed(device, led, &sc) != NAME_NOT_FOUND) {
+ if (device && device->hasValidFd() && mapLed(device, led, &sc) != NAME_NOT_FOUND) {
struct input_event ev;
ev.time.tv_sec = 0;
ev.time.tv_usec = 0;
@@ -636,7 +656,7 @@
void EventHub::vibrate(int32_t deviceId, nsecs_t duration) {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
- if (device && !device->isVirtual()) {
+ if (device && device->hasValidFd()) {
ff_effect effect;
memset(&effect, 0, sizeof(effect));
effect.type = FF_RUMBLE;
@@ -670,7 +690,7 @@
void EventHub::cancelVibrate(int32_t deviceId) {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
- if (device && !device->isVirtual()) {
+ if (device && device->hasValidFd()) {
if (device->ffEffectPlaying) {
device->ffEffectPlaying = false;
@@ -1065,12 +1085,37 @@
AKEYCODE_BUTTON_START, AKEYCODE_BUTTON_SELECT, AKEYCODE_BUTTON_MODE,
};
+status_t EventHub::registerDeviceForEpollLocked(Device* device) {
+ struct epoll_event eventItem;
+ memset(&eventItem, 0, sizeof(eventItem));
+ eventItem.events = EPOLLIN;
+ if (mUsingEpollWakeup) {
+ eventItem.events |= EPOLLWAKEUP;
+ }
+ eventItem.data.u32 = device->id;
+ if (epoll_ctl(mEpollFd, EPOLL_CTL_ADD, device->fd, &eventItem)) {
+ ALOGE("Could not add device fd to epoll instance. errno=%d", errno);
+ return -errno;
+ }
+ return OK;
+}
+
+status_t EventHub::unregisterDeviceFromEpollLocked(Device* device) {
+ if (device->hasValidFd()) {
+ if (epoll_ctl(mEpollFd, EPOLL_CTL_DEL, device->fd, NULL)) {
+ ALOGW("Could not remove device fd from epoll instance. errno=%d", errno);
+ return -errno;
+ }
+ }
+ return OK;
+}
+
status_t EventHub::openDeviceLocked(const char *devicePath) {
char buffer[80];
ALOGV("Opening device: %s", devicePath);
- int fd = open(devicePath, O_RDWR | O_CLOEXEC);
+ int fd = open(devicePath, O_RDWR | O_CLOEXEC | O_NONBLOCK);
if(fd < 0) {
ALOGE("could not open %s, %s\n", devicePath, strerror(errno));
return -1;
@@ -1135,13 +1180,6 @@
// Fill in the descriptor.
assignDescriptorLocked(identifier);
- // Make file descriptor non-blocking for use with poll().
- if (fcntl(fd, F_SETFL, O_NONBLOCK)) {
- ALOGE("Error %d making device file descriptor non-blocking.", errno);
- close(fd);
- return -1;
- }
-
// Allocate device. (The device object takes ownership of the fd at this point.)
int32_t deviceId = mNextDeviceId++;
Device* device = new Device(fd, deviceId, String8(devicePath), identifier);
@@ -1303,12 +1341,6 @@
break;
}
}
-
- // Disable kernel key repeat since we handle it ourselves
- unsigned int repeatRate[] = {0,0};
- if (ioctl(fd, EVIOCSREP, repeatRate)) {
- ALOGW("Unable to disable kernel key repeat for %s: %s", devicePath, strerror(errno));
- }
}
// If the device isn't recognized as something we handle, don't monitor it.
@@ -1332,23 +1364,41 @@
if (device->classes & (INPUT_DEVICE_CLASS_JOYSTICK | INPUT_DEVICE_CLASS_DPAD)
&& device->classes & INPUT_DEVICE_CLASS_GAMEPAD) {
device->controllerNumber = getNextControllerNumberLocked(device);
- setLedForController(device);
+ setLedForControllerLocked(device);
}
- // Register with epoll.
- struct epoll_event eventItem;
- memset(&eventItem, 0, sizeof(eventItem));
- eventItem.events = EPOLLIN;
- if (mUsingEpollWakeup) {
- eventItem.events |= EPOLLWAKEUP;
- }
- eventItem.data.u32 = deviceId;
- if (epoll_ctl(mEpollFd, EPOLL_CTL_ADD, fd, &eventItem)) {
- ALOGE("Could not add device fd to epoll instance. errno=%d", errno);
+
+ if (registerDeviceForEpollLocked(device) != OK) {
delete device;
return -1;
}
+ configureFd(device);
+
+ ALOGI("New device: id=%d, fd=%d, path='%s', name='%s', classes=0x%x, "
+ "configuration='%s', keyLayout='%s', keyCharacterMap='%s', builtinKeyboard=%s, ",
+ deviceId, fd, devicePath, device->identifier.name.string(),
+ device->classes,
+ device->configurationFile.string(),
+ device->keyMap.keyLayoutFile.string(),
+ device->keyMap.keyCharacterMapFile.string(),
+ toString(mBuiltInKeyboardId == deviceId));
+
+ addDeviceLocked(device);
+ return OK;
+}
+
+void EventHub::configureFd(Device* device) {
+ // Set fd parameters with ioctl, such as key repeat, suspend block, and clock type
+ if (device->classes & INPUT_DEVICE_CLASS_KEYBOARD) {
+ // Disable kernel key repeat since we handle it ourselves
+ unsigned int repeatRate[] = {0, 0};
+ if (ioctl(device->fd, EVIOCSREP, repeatRate)) {
+ ALOGW("Unable to disable kernel key repeat for %s: %s",
+ device->path.string(), strerror(errno));
+ }
+ }
+
String8 wakeMechanism("EPOLLWAKEUP");
if (!mUsingEpollWakeup) {
#ifndef EVIOCSSUSPENDBLOCK
@@ -1357,44 +1407,67 @@
// this feature, we need to be prepared to define the ioctl ourselves.
#define EVIOCSSUSPENDBLOCK _IOW('E', 0x91, int)
#endif
- if (ioctl(fd, EVIOCSSUSPENDBLOCK, 1)) {
+ if (ioctl(device->fd, EVIOCSSUSPENDBLOCK, 1)) {
wakeMechanism = "<none>";
} else {
wakeMechanism = "EVIOCSSUSPENDBLOCK";
}
}
-
// Tell the kernel that we want to use the monotonic clock for reporting timestamps
// associated with input events. This is important because the input system
// uses the timestamps extensively and assumes they were recorded using the monotonic
// clock.
- //
- // In older kernel, before Linux 3.4, there was no way to tell the kernel which
- // clock to use to input event timestamps. The standard kernel behavior was to
- // record a real time timestamp, which isn't what we want. Android kernels therefore
- // contained a patch to the evdev_event() function in drivers/input/evdev.c to
- // replace the call to do_gettimeofday() with ktime_get_ts() to cause the monotonic
- // clock to be used instead of the real time clock.
- //
- // As of Linux 3.4, there is a new EVIOCSCLOCKID ioctl to set the desired clock.
- // Therefore, we no longer require the Android-specific kernel patch described above
- // as long as we make sure to set select the monotonic clock. We do that here.
int clockId = CLOCK_MONOTONIC;
- bool usingClockIoctl = !ioctl(fd, EVIOCSCLOCKID, &clockId);
+ bool usingClockIoctl = !ioctl(device->fd, EVIOCSCLOCKID, &clockId);
+ ALOGI("wakeMechanism=%s, usingClockIoctl=%s", wakeMechanism.string(),
+ toString(usingClockIoctl));
+}
- ALOGI("New device: id=%d, fd=%d, path='%s', name='%s', classes=0x%x, "
- "configuration='%s', keyLayout='%s', keyCharacterMap='%s', builtinKeyboard=%s, "
- "wakeMechanism=%s, usingClockIoctl=%s",
- deviceId, fd, devicePath, device->identifier.name.string(),
- device->classes,
- device->configurationFile.string(),
- device->keyMap.keyLayoutFile.string(),
- device->keyMap.keyCharacterMapFile.string(),
- toString(mBuiltInKeyboardId == deviceId),
- wakeMechanism.string(), toString(usingClockIoctl));
+bool EventHub::isDeviceEnabled(int32_t deviceId) {
+ AutoMutex _l(mLock);
+ Device* device = getDeviceLocked(deviceId);
+ if (device == NULL) {
+ ALOGE("Invalid device id=%" PRId32 " provided to %s", deviceId, __func__);
+ return false;
+ }
+ return device->enabled;
+}
- addDeviceLocked(device);
- return 0;
+status_t EventHub::enableDevice(int32_t deviceId) {
+ AutoMutex _l(mLock);
+ Device* device = getDeviceLocked(deviceId);
+ if (device == NULL) {
+ ALOGE("Invalid device id=%" PRId32 " provided to %s", deviceId, __func__);
+ return BAD_VALUE;
+ }
+ if (device->enabled) {
+ ALOGW("Duplicate call to %s, input device %" PRId32 " already enabled", __func__, deviceId);
+ return OK;
+ }
+ status_t result = device->enable();
+ if (result != OK) {
+ ALOGE("Failed to enable device %" PRId32, deviceId);
+ return result;
+ }
+
+ configureFd(device);
+
+ return registerDeviceForEpollLocked(device);
+}
+
+status_t EventHub::disableDevice(int32_t deviceId) {
+ AutoMutex _l(mLock);
+ Device* device = getDeviceLocked(deviceId);
+ if (device == NULL) {
+ ALOGE("Invalid device id=%" PRId32 " provided to %s", deviceId, __func__);
+ return BAD_VALUE;
+ }
+ if (!device->enabled) {
+ ALOGW("Duplicate call to %s, input device already disabled", __func__);
+ return OK;
+ }
+ unregisterDeviceFromEpollLocked(device);
+ return device->disable();
}
void EventHub::createVirtualKeyboardLocked() {
@@ -1490,7 +1563,7 @@
mControllerNumbers.clearBit(static_cast<uint32_t>(num - 1));
}
-void EventHub::setLedForController(Device* device) {
+void EventHub::setLedForControllerLocked(Device* device) {
for (int i = 0; i < MAX_CONTROLLER_LEDS; i++) {
setLedStateLocked(device, ALED_CONTROLLER_1 + i, device->controllerNumber == i + 1);
}
@@ -1500,7 +1573,7 @@
if (!device->keyMap.haveKeyLayout()) {
return false;
}
-
+
Vector<int32_t> scanCodes;
device->keyMap.keyLayoutMap->findScanCodesForKey(keycode, &scanCodes);
const size_t N = scanCodes.size();
@@ -1510,7 +1583,7 @@
return true;
}
}
-
+
return false;
}
@@ -1556,11 +1629,7 @@
mBuiltInKeyboardId = NO_BUILT_IN_KEYBOARD;
}
- if (!device->isVirtual()) {
- if (epoll_ctl(mEpollFd, EPOLL_CTL_DEL, device->fd, NULL)) {
- ALOGW("Could not remove device fd from epoll instance. errno=%d", errno);
- }
- }
+ unregisterDeviceFromEpollLocked(device);
releaseControllerNumberLocked(device);
@@ -1691,6 +1760,7 @@
}
dump.appendFormat(INDENT3 "Classes: 0x%08x\n", device->classes);
dump.appendFormat(INDENT3 "Path: %s\n", device->path.string());
+ dump.appendFormat(INDENT3 "Enabled: %s\n", toString(device->enabled));
dump.appendFormat(INDENT3 "Descriptor: %s\n", device->identifier.descriptor.string());
dump.appendFormat(INDENT3 "Location: %s\n", device->identifier.location.string());
dump.appendFormat(INDENT3 "ControllerNumber: %d\n", device->controllerNumber);