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[client] evdev: fix input capture and device handling

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Classify configured devices by keyboard and pointer capability so
automatic keyboard capture leaves relative pointer devices with the
display server.

Run descriptor, grab, physical-state, and LED operations on one worker.
Marshal normalized events through each display server's event loop and
serialize ownership changes with per-lane barriers.

Fall back whole lanes to native input when an evdev cohort cannot be
owned, and retry missing or removed devices without disabling the rest.

Handle report framing, SYN_DROPPED, high-resolution wheels, queue
overflow, held-state cleanup, and guest-driven keyboard LEDs. Restore
host LEDs and kernel grabs during teardown.

Re-evaluate capture when the active input transport changes.
This commit is contained in:
Geoffrey McRae
2026-08-21 13:10:34 +10:00
parent 8b38546049
commit 423269802f
12 changed files with 2359 additions and 301 deletions
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23
client/include/evdev.h
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@@ -36,22 +36,31 @@ bool evdev_start(void);
void evdev_stop(void);
/**
* restore the display server hooks and free the device state; only
* call once display server callbacks have stopped
* free the device state; only call once display server callbacks have stopped
*/
void evdev_free(void);
/**
* grab the keyboard for exclusive access
* update the keyboard and pointer capture requirements
*/
void evdev_grabKeyboard(void);
void evdev_setGrab(bool keyboard, bool pointer);
/**
* ungrab the keyboard
* return the event fd used to dispatch captured input
*/
void evdev_ungrabKeyboard(void);
int evdev_getEventFD(void);
/**
* returns true if input should only be processed by evdev
* dispatch captured input on the display server's event thread
*/
void evdev_dispatch(void * opaque);
/**
* return true if keyboard input should only be processed by evdev
*/
bool evdev_isExclusive(void);
/**
* return true if pointer input should only be processed by evdev
*/
bool evdev_isPointerExclusive(void);

10
client/include/input.h
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@@ -25,6 +25,7 @@
typedef void (*LGInputKeyboardLEDsFn)(void * opaque,
bool valid, uint8_t leds);
typedef void (*LGInputAvailabilityFn)(void * opaque, bool available);
void lgInput_init(void);
void lgInput_free(void);
@@ -43,11 +44,20 @@ bool lgInput_supports(LG_InputSupport support);
* call back into the input layer. */
void lgInput_setKeyboardLEDsListener(
LGInputKeyboardLEDsFn callback, void * opaque);
/* The listener is called synchronously with the current input availability
* and later from transport threads whenever it changes. The callback must
* not call back into the input layer. */
void lgInput_setAvailabilityListener(
LGInputAvailabilityFn callback, void * opaque);
bool lgInput_keyDown(int key);
bool lgInput_keyUp(int key);
bool lgInput_keyboardLEDs(bool numLock, bool capsLock, bool scrollLock);
void lgInput_releaseKeys(void);
void lgInput_releaseButtons(void);
/* Release all tracked keyboard and mouse button state under one active-input
* transaction. */
void lgInput_releaseAll(void);
bool lgInput_mouseMotion(int32_t x, int32_t y);
bool lgInput_mousePosition(uint32_t x, uint32_t y, uint32_t width,