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xemu/ui/input-linux.c
Niklas Haas a923b471fc input-linux: add shift+shift as a grab toggle 
We have ctrl-ctrl and alt-alt; why not shift-shift? That's my preferred
grab binding, personally.

Signed-off-by: Niklas Haas <git@haasn.xyz>
Message-id: 20190818105038.19520-1-qemu@haasn.xyz
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2019-08-21 12:25:46 +02:00

517 lines
14 KiB
C
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/*
* This work is licensed under the terms of the GNU GPL, version 2 or
* (at your option) any later version. See the COPYING file in the
* top-level directory.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/config-file.h"
#include "qemu/main-loop.h"
#include "qemu/module.h"
#include "qemu/sockets.h"
#include "ui/input.h"
#include "qom/object_interfaces.h"
#include "sysemu/iothread.h"
#include "block/aio.h"
#include <sys/ioctl.h>
#include "standard-headers/linux/input.h"
static bool linux_is_button(unsigned int lnx)
{
if (lnx < 0x100) {
return false;
}
if (lnx >= 0x160 && lnx < 0x2c0) {
return false;
}
return true;
}
#define TYPE_INPUT_LINUX "input-linux"
#define INPUT_LINUX(obj) \
OBJECT_CHECK(InputLinux, (obj), TYPE_INPUT_LINUX)
#define INPUT_LINUX_GET_CLASS(obj) \
OBJECT_GET_CLASS(InputLinuxClass, (obj), TYPE_INPUT_LINUX)
#define INPUT_LINUX_CLASS(klass) \
OBJECT_CLASS_CHECK(InputLinuxClass, (klass), TYPE_INPUT_LINUX)
typedef struct InputLinux InputLinux;
typedef struct InputLinuxClass InputLinuxClass;
struct InputLinux {
Object parent;
char *evdev;
int fd;
bool repeat;
bool grab_request;
bool grab_active;
bool grab_all;
bool keydown[KEY_CNT];
int keycount;
int wheel;
bool initialized;
bool has_rel_x;
bool has_abs_x;
int num_keys;
int num_btns;
int abs_x_min;
int abs_x_max;
int abs_y_min;
int abs_y_max;
struct input_event event;
int read_offset;
enum GrabToggleKeys grab_toggle;
QTAILQ_ENTRY(InputLinux) next;
};
struct InputLinuxClass {
ObjectClass parent_class;
};
static QTAILQ_HEAD(, InputLinux) inputs = QTAILQ_HEAD_INITIALIZER(inputs);
static void input_linux_toggle_grab(InputLinux *il)
{
intptr_t request = !il->grab_active;
InputLinux *item;
int rc;
rc = ioctl(il->fd, EVIOCGRAB, request);
if (rc < 0) {
return;
}
il->grab_active = !il->grab_active;
if (!il->grab_all) {
return;
}
QTAILQ_FOREACH(item, &inputs, next) {
if (item == il || item->grab_all) {
/* avoid endless loops */
continue;
}
if (item->grab_active != il->grab_active) {
input_linux_toggle_grab(item);
}
}
}
static bool input_linux_check_toggle(InputLinux *il)
{
switch (il->grab_toggle) {
case GRAB_TOGGLE_KEYS_CTRL_CTRL:
return il->keydown[KEY_LEFTCTRL] &&
il->keydown[KEY_RIGHTCTRL];
case GRAB_TOGGLE_KEYS_ALT_ALT:
return il->keydown[KEY_LEFTALT] &&
il->keydown[KEY_RIGHTALT];
case GRAB_TOGGLE_KEYS_SHIFT_SHIFT:
return il->keydown[KEY_LEFTSHIFT] &&
il->keydown[KEY_RIGHTSHIFT];
case GRAB_TOGGLE_KEYS_META_META:
return il->keydown[KEY_LEFTMETA] &&
il->keydown[KEY_RIGHTMETA];
case GRAB_TOGGLE_KEYS_SCROLLLOCK:
return il->keydown[KEY_SCROLLLOCK];
case GRAB_TOGGLE_KEYS_CTRL_SCROLLLOCK:
return (il->keydown[KEY_LEFTCTRL] ||
il->keydown[KEY_RIGHTCTRL]) &&
il->keydown[KEY_SCROLLLOCK];
case GRAB_TOGGLE_KEYS__MAX:
/* avoid gcc error */
break;
}
return false;
}
static bool input_linux_should_skip(InputLinux *il,
struct input_event *event)
{
return (il->grab_toggle == GRAB_TOGGLE_KEYS_SCROLLLOCK ||
il->grab_toggle == GRAB_TOGGLE_KEYS_CTRL_SCROLLLOCK) &&
event->code == KEY_SCROLLLOCK;
}
static void input_linux_handle_keyboard(InputLinux *il,
struct input_event *event)
{
if (event->type == EV_KEY) {
if (event->value > 2 || (event->value > 1 && !il->repeat)) {
/*
* ignore autorepeat + unknown key events
* 0 == up, 1 == down, 2 == autorepeat, other == undefined
*/
return;
}
if (event->code >= KEY_CNT) {
/*
* Should not happen. But better safe than sorry,
* and we make Coverity happy too.
*/
return;
}
/* keep track of key state */
if (!il->keydown[event->code] && event->value) {
il->keydown[event->code] = true;
il->keycount++;
}
if (il->keydown[event->code] && !event->value) {
il->keydown[event->code] = false;
il->keycount--;
}
/* send event to guest when grab is active */
if (il->grab_active && !input_linux_should_skip(il, event)) {
int qcode = qemu_input_linux_to_qcode(event->code);
qemu_input_event_send_key_qcode(NULL, qcode, event->value);
}
/* hotkey -> record switch request ... */
if (input_linux_check_toggle(il)) {
il->grab_request = true;
}
/*
* ... and do the switch when all keys are lifted, so we
* confuse neither guest nor host with keys which seem to
* be stuck due to missing key-up events.
*/
if (il->grab_request && !il->keycount) {
il->grab_request = false;
input_linux_toggle_grab(il);
}
}
}
static void input_linux_event_mouse_button(int button)
{
qemu_input_queue_btn(NULL, button, true);
qemu_input_event_sync();
qemu_input_queue_btn(NULL, button, false);
qemu_input_event_sync();
}
static void input_linux_handle_mouse(InputLinux *il, struct input_event *event)
{
if (!il->grab_active) {
return;
}
switch (event->type) {
case EV_KEY:
switch (event->code) {
case BTN_LEFT:
qemu_input_queue_btn(NULL, INPUT_BUTTON_LEFT, event->value);
break;
case BTN_RIGHT:
qemu_input_queue_btn(NULL, INPUT_BUTTON_RIGHT, event->value);
break;
case BTN_MIDDLE:
qemu_input_queue_btn(NULL, INPUT_BUTTON_MIDDLE, event->value);
break;
case BTN_GEAR_UP:
qemu_input_queue_btn(NULL, INPUT_BUTTON_WHEEL_UP, event->value);
break;
case BTN_GEAR_DOWN:
qemu_input_queue_btn(NULL, INPUT_BUTTON_WHEEL_DOWN,
event->value);
break;
case BTN_SIDE:
qemu_input_queue_btn(NULL, INPUT_BUTTON_SIDE, event->value);
break;
case BTN_EXTRA:
qemu_input_queue_btn(NULL, INPUT_BUTTON_EXTRA, event->value);
break;
};
break;
case EV_REL:
switch (event->code) {
case REL_X:
qemu_input_queue_rel(NULL, INPUT_AXIS_X, event->value);
break;
case REL_Y:
qemu_input_queue_rel(NULL, INPUT_AXIS_Y, event->value);
break;
case REL_WHEEL:
il->wheel = event->value;
break;
}
break;
case EV_ABS:
switch (event->code) {
case ABS_X:
qemu_input_queue_abs(NULL, INPUT_AXIS_X, event->value,
il->abs_x_min, il->abs_x_max);
break;
case ABS_Y:
qemu_input_queue_abs(NULL, INPUT_AXIS_Y, event->value,
il->abs_y_min, il->abs_y_max);
break;
}
break;
case EV_SYN:
qemu_input_event_sync();
if (il->wheel != 0) {
input_linux_event_mouse_button((il->wheel > 0)
? INPUT_BUTTON_WHEEL_UP
: INPUT_BUTTON_WHEEL_DOWN);
il->wheel = 0;
}
break;
}
}
static void input_linux_event(void *opaque)
{
InputLinux *il = opaque;
int rc;
int read_size;
uint8_t *p = (uint8_t *)&il->event;
for (;;) {
read_size = sizeof(il->event) - il->read_offset;
rc = read(il->fd, &p[il->read_offset], read_size);
if (rc != read_size) {
if (rc < 0 && errno != EAGAIN) {
fprintf(stderr, "%s: read: %s\n", __func__, strerror(errno));
qemu_set_fd_handler(il->fd, NULL, NULL, NULL);
close(il->fd);
} else if (rc > 0) {
il->read_offset += rc;
}
break;
}
il->read_offset = 0;
if (il->num_keys) {
input_linux_handle_keyboard(il, &il->event);
}
if ((il->has_rel_x || il->has_abs_x) && il->num_btns) {
input_linux_handle_mouse(il, &il->event);
}
}
}
static void input_linux_complete(UserCreatable *uc, Error **errp)
{
InputLinux *il = INPUT_LINUX(uc);
uint8_t evtmap, relmap, absmap;
uint8_t keymap[KEY_CNT / 8], keystate[KEY_CNT / 8];
unsigned int i;
int rc, ver;
struct input_absinfo absinfo;
if (!il->evdev) {
error_setg(errp, "no input device specified");
return;
}
il->fd = open(il->evdev, O_RDWR);
if (il->fd < 0) {
error_setg_file_open(errp, errno, il->evdev);
return;
}
qemu_set_nonblock(il->fd);
rc = ioctl(il->fd, EVIOCGVERSION, &ver);
if (rc < 0) {
error_setg(errp, "%s: is not an evdev device", il->evdev);
goto err_close;
}
rc = ioctl(il->fd, EVIOCGBIT(0, sizeof(evtmap)), &evtmap);
if (rc < 0) {
error_setg(errp, "%s: failed to read event bits", il->evdev);
goto err_close;
}
if (evtmap & (1 << EV_REL)) {
relmap = 0;
rc = ioctl(il->fd, EVIOCGBIT(EV_REL, sizeof(relmap)), &relmap);
if (relmap & (1 << REL_X)) {
il->has_rel_x = true;
}
}
if (evtmap & (1 << EV_ABS)) {
absmap = 0;
rc = ioctl(il->fd, EVIOCGBIT(EV_ABS, sizeof(absmap)), &absmap);
if (absmap & (1 << ABS_X)) {
il->has_abs_x = true;
rc = ioctl(il->fd, EVIOCGABS(ABS_X), &absinfo);
il->abs_x_min = absinfo.minimum;
il->abs_x_max = absinfo.maximum;
rc = ioctl(il->fd, EVIOCGABS(ABS_Y), &absinfo);
il->abs_y_min = absinfo.minimum;
il->abs_y_max = absinfo.maximum;
}
}
if (evtmap & (1 << EV_KEY)) {
memset(keymap, 0, sizeof(keymap));
rc = ioctl(il->fd, EVIOCGBIT(EV_KEY, sizeof(keymap)), keymap);
rc = ioctl(il->fd, EVIOCGKEY(sizeof(keystate)), keystate);
for (i = 0; i < KEY_CNT; i++) {
if (keymap[i / 8] & (1 << (i % 8))) {
if (linux_is_button(i)) {
il->num_btns++;
} else {
il->num_keys++;
}
if (keystate[i / 8] & (1 << (i % 8))) {
il->keydown[i] = true;
il->keycount++;
}
}
}
}
qemu_set_fd_handler(il->fd, input_linux_event, NULL, il);
if (il->keycount) {
/* delay grab until all keys are released */
il->grab_request = true;
} else {
input_linux_toggle_grab(il);
}
QTAILQ_INSERT_TAIL(&inputs, il, next);
il->initialized = true;
return;
err_close:
close(il->fd);
return;
}
static void input_linux_instance_finalize(Object *obj)
{
InputLinux *il = INPUT_LINUX(obj);
if (il->initialized) {
QTAILQ_REMOVE(&inputs, il, next);
close(il->fd);
}
g_free(il->evdev);
}
static char *input_linux_get_evdev(Object *obj, Error **errp)
{
InputLinux *il = INPUT_LINUX(obj);
return g_strdup(il->evdev);
}
static void input_linux_set_evdev(Object *obj, const char *value,
Error **errp)
{
InputLinux *il = INPUT_LINUX(obj);
if (il->evdev) {
error_setg(errp, "evdev property already set");
return;
}
il->evdev = g_strdup(value);
}
static bool input_linux_get_grab_all(Object *obj, Error **errp)
{
InputLinux *il = INPUT_LINUX(obj);
return il->grab_all;
}
static void input_linux_set_grab_all(Object *obj, bool value,
Error **errp)
{
InputLinux *il = INPUT_LINUX(obj);
il->grab_all = value;
}
static bool input_linux_get_repeat(Object *obj, Error **errp)
{
InputLinux *il = INPUT_LINUX(obj);
return il->repeat;
}
static void input_linux_set_repeat(Object *obj, bool value,
Error **errp)
{
InputLinux *il = INPUT_LINUX(obj);
il->repeat = value;
}
static int input_linux_get_grab_toggle(Object *obj, Error **errp)
{
InputLinux *il = INPUT_LINUX(obj);
return il->grab_toggle;
}
static void input_linux_set_grab_toggle(Object *obj, int value,
Error **errp)
{
InputLinux *il = INPUT_LINUX(obj);
il->grab_toggle = value;
}
static void input_linux_instance_init(Object *obj)
{
object_property_add_str(obj, "evdev",
input_linux_get_evdev,
input_linux_set_evdev, NULL);
object_property_add_bool(obj, "grab_all",
input_linux_get_grab_all,
input_linux_set_grab_all, NULL);
object_property_add_bool(obj, "repeat",
input_linux_get_repeat,
input_linux_set_repeat, NULL);
object_property_add_enum(obj, "grab-toggle", "GrabToggleKeys",
&GrabToggleKeys_lookup,
input_linux_get_grab_toggle,
input_linux_set_grab_toggle, NULL);
}
static void input_linux_class_init(ObjectClass *oc, void *data)
{
UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
ucc->complete = input_linux_complete;
}
static const TypeInfo input_linux_info = {
.name = TYPE_INPUT_LINUX,
.parent = TYPE_OBJECT,
.class_size = sizeof(InputLinuxClass),
.class_init = input_linux_class_init,
.instance_size = sizeof(InputLinux),
.instance_init = input_linux_instance_init,
.instance_finalize = input_linux_instance_finalize,
.interfaces = (InterfaceInfo[]) {
{ TYPE_USER_CREATABLE },
{ }
}
};
static void register_types(void)
{
type_register_static(&input_linux_info);
}
type_init(register_types);
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