Linux Kernel inputhandler处理

/*  * Pass values first through all filters and then, if event has not been  * filtered out, through all open handles. This function is called with  * dev->event_lock held and interrupts disabled.  */ static void input_pass_values(struct input_dev *dev,      struct input_value *vals, unsigned int count) { struct input_handle *handle; struct input_value *v; if (!count) return; rcu_read_lock(); handle = rcu_dereference(dev->grab); if (handle) { count = input_to_handler(handle, vals, count); } else { list_for_each_entry_rcu(handle, &dev->h_list, d_node) if (handle->open) { count = input_to_handler(handle, vals, count); if (!count) break; } } rcu_read_unlock(); /* trigger auto repeat for key events */ if (test_bit(EV_REP, dev->evbit) && test_bit(EV_KEY, dev->evbit)) { for (v = vals; v != vals + count; v++) { if (v->type == EV_KEY && v->value != 2) { if (v->value) input_start_autorepeat(dev, v->code); else input_stop_autorepeat(dev); } } } } /*  * Pass event first through all filters and then, if event has not been  * filtered out, through all open handles. This function is called with  * dev->event_lock held and interrupts disabled.  */ static unsigned int input_to_handler(struct input_handle *handle, struct input_value *vals, unsigned int count) { struct input_handler *handler = handle->handler; struct input_value *end = vals; struct input_value *v; if (handler->filter) { for (v = vals; v != vals + count; v++) { if (handler->filter(handle, v->type, v->code, v->value)) continue; if (end != v) *end = *v; end++; } count = end - vals; } if (!count) return 0; if (handler->events) handler->events(handle, vals, count); else if (handler->event) for (v = vals; v != vals + count; v++) handler->event(handle, v->type, v->code, v->value); return count; } static struct input_handler kbd_handler = { .event = kbd_event, .match = kbd_match, .connect = kbd_connect, .disconnect = kbd_disconnect, .start = kbd_start, .name = "kbd", .id_table = kbd_ids, }; int __init kbd_init(void) { int i; int error; for (i = 0; i < MAX_NR_CONSOLES; i++) { kbd_table[i].ledflagstate = kbd_defleds(); kbd_table[i].default_ledflagstate = kbd_defleds(); kbd_table[i].ledmode = LED_SHOW_FLAGS; kbd_table[i].lockstate = KBD_DEFLOCK; kbd_table[i].slockstate = 0; kbd_table[i].modeflags = KBD_DEFMODE; kbd_table[i].kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE; } kbd_init_leds(); error = input_register_handler(&kbd_handler); if (error) return error; tasklet_enable(&keyboard_tasklet); tasklet_schedule(&keyboard_tasklet); return 0; }