Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /* fakekey.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Functions for simulating keypresses.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright (C) 2010 the Speakup Team
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/preempt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/percpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/input.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include "speakup.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #define PRESSED 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define RELEASED 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static DEFINE_PER_CPU(int, reporting_keystroke);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static struct input_dev *virt_keyboard;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) int speakup_add_virtual_keyboard(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	virt_keyboard = input_allocate_device();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	if (!virt_keyboard)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	virt_keyboard->name = "Speakup";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	virt_keyboard->id.bustype = BUS_VIRTUAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	virt_keyboard->phys = "speakup/input0";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	virt_keyboard->dev.parent = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	__set_bit(EV_KEY, virt_keyboard->evbit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	__set_bit(KEY_DOWN, virt_keyboard->keybit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	err = input_register_device(virt_keyboard);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 		input_free_device(virt_keyboard);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 		virt_keyboard = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) void speakup_remove_virtual_keyboard(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	if (virt_keyboard) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 		input_unregister_device(virt_keyboard);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 		virt_keyboard = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)  * Send a simulated down-arrow to the application.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) void speakup_fake_down_arrow(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	/* disable keyboard interrupts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	local_irq_save(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	/* don't change CPU */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	preempt_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	__this_cpu_write(reporting_keystroke, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	input_report_key(virt_keyboard, KEY_DOWN, PRESSED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	input_report_key(virt_keyboard, KEY_DOWN, RELEASED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 	input_sync(virt_keyboard);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	__this_cpu_write(reporting_keystroke, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	/* reenable preemption */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	preempt_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 	/* reenable keyboard interrupts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 	local_irq_restore(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)  * Are we handling a simulated keypress on the current CPU?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)  * Returns a boolean.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) bool speakup_fake_key_pressed(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) 	return this_cpu_read(reporting_keystroke);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }