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Commit 05f6c605 authored by Prabir Pradhan's avatar Prabir Pradhan
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Prevent keyboards from being recognized as a stylus 

We are getting reports of keyboards and other peripherals being
misconfigured as a stylus, because they report support for stylus
buttons.

To eliminate some of these misconfigurations, prevent anything detected
as a alphabetical keyboard from being categorized as a stylus.

Bug: 293996865
Test: None
Change-Id: I3f071d2ac6a2b70abc1130b4d5df1509452bb63b
(cherry picked from commit 3c28b945)
parent 19603058

services/inputflinger/reader/EventHub.cpp

+1 −0
Original line number Diff line number Diff line
@@ -2403,6 +2403,7 @@ void EventHub::openDeviceLocked(const std::string& devicePath) { 


        // See if this device has any stylus buttons that we would want to fuse with touch data.

        if (!device->classes.any(InputDeviceClass::TOUCH | InputDeviceClass::TOUCH_MT) &&

            !device->classes.any(InputDeviceClass::ALPHAKEY) &&

            std::any_of(STYLUS_BUTTON_KEYCODES.begin(), STYLUS_BUTTON_KEYCODES.end(),

                        [&](int32_t keycode) { return device->hasKeycodeLocked(keycode); })) {

            device->classes |= InputDeviceClass::EXTERNAL_STYLUS;

services/inputflinger/tests/InputReader_test.cpp

+18 −0
Original line number Diff line number Diff line
@@ -1476,6 +1476,24 @@ TEST_F(InputReaderIntegrationTest, ExternalStylusesButtons) { 
            AllOf(UP, WithKeyCode(AKEYCODE_STYLUS_BUTTON_TERTIARY))));

}













TEST_F(InputReaderIntegrationTest, KeyboardWithStylusButtons) {













    std::unique_ptr<UinputKeyboard> keyboard =













            createUinputDevice<UinputKeyboard>("KeyboardWithStylusButtons", /*productId=*/99,













                                               std::initializer_list<int>{KEY_Q, KEY_W, KEY_E,













                                                                          KEY_R, KEY_T, KEY_Y,













                                                                          BTN_STYLUS, BTN_STYLUS2,













                                                                          BTN_STYLUS3});













    ASSERT_NO_FATAL_FAILURE(mFakePolicy->assertInputDevicesChanged());

























    const auto device = findDeviceByName(keyboard->getName());













    ASSERT_TRUE(device.has_value());

























    // An alphabetical keyboard that reports stylus buttons should not be recognized as a stylus.













    ASSERT_EQ(AINPUT_SOURCE_KEYBOARD, device->getSources())













            << "Unexpected source " << inputEventSourceToString(device->getSources()).c_str();













    ASSERT_EQ(AINPUT_KEYBOARD_TYPE_ALPHABETIC, device->getKeyboardType());













}



























/**















 * The Steam controller sends BTN_GEAR_DOWN and BTN_GEAR_UP for the two "paddle" buttons















 * on the back. In this test, we make sure that BTN_GEAR_DOWN / BTN_WHEEL and BTN_GEAR_UP