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d5e8b698ec5c8a0043bee2ad9daffc532a6e652d
qemu/hw/input/virtio-input-hid.c
Akihiko Odaki d5e8b698ec hw/input/virtio-input: Use Linux key codes 
QemuInputEvent now stores Linux key codes for key events. Use those
codes directly instead of translating between internal key code
representations.

Signed-off-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-ID: <20260520-input-v3-14-7c9e4c7abe34@rsg.ci.i.u-tokyo.ac.jp>
2026-05-25 01:00:54 +04:00

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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 "qemu/iov.h"
#include "qemu/module.h"
#include "hw/virtio/virtio.h"
#include "hw/core/qdev-properties.h"
#include "hw/virtio/virtio-input.h"
#include "ui/console.h"
#include "standard-headers/linux/input.h"
#define VIRTIO_ID_NAME_KEYBOARD "QEMU Virtio Keyboard"
#define VIRTIO_ID_NAME_MOUSE "QEMU Virtio Mouse"
#define VIRTIO_ID_NAME_TABLET "QEMU Virtio Tablet"
#define VIRTIO_ID_NAME_MULTITOUCH "QEMU Virtio MultiTouch"
/* ----------------------------------------------------------------- */
static const unsigned short keymap_button[INPUT_BUTTON__MAX] = {
[INPUT_BUTTON_LEFT] = BTN_LEFT,
[INPUT_BUTTON_RIGHT] = BTN_RIGHT,
[INPUT_BUTTON_MIDDLE] = BTN_MIDDLE,
[INPUT_BUTTON_WHEEL_UP] = BTN_GEAR_UP,
[INPUT_BUTTON_WHEEL_DOWN] = BTN_GEAR_DOWN,
[INPUT_BUTTON_SIDE] = BTN_SIDE,
[INPUT_BUTTON_EXTRA] = BTN_EXTRA,
[INPUT_BUTTON_TOUCH] = BTN_TOUCH,
};
static const unsigned short axismap_rel[INPUT_AXIS__MAX] = {
[INPUT_AXIS_X] = REL_X,
[INPUT_AXIS_Y] = REL_Y,
};
static const unsigned short axismap_abs[INPUT_AXIS__MAX] = {
[INPUT_AXIS_X] = ABS_X,
[INPUT_AXIS_Y] = ABS_Y,
};
static const unsigned short axismap_tch[INPUT_AXIS__MAX] = {
[INPUT_AXIS_X] = ABS_MT_POSITION_X,
[INPUT_AXIS_Y] = ABS_MT_POSITION_Y,
};
/* ----------------------------------------------------------------- */
static void virtio_input_extend_config(VirtIOInput *vinput,
const unsigned short *map,
size_t mapsize,
uint8_t select, uint8_t subsel)
{
virtio_input_config ext;
int i, bit, byte, bmax = 0;
memset(&ext, 0, sizeof(ext));
for (i = 0; i < mapsize; i++) {
bit = map[i];
if (!bit) {
continue;
}
byte = bit / 8;
bit = bit % 8;
ext.u.bitmap[byte] |= (1 << bit);
if (bmax < byte+1) {
bmax = byte+1;
}
}
ext.select = select;
ext.subsel = subsel;
ext.size = bmax;
virtio_input_add_config(vinput, &ext);
}
static void virtio_input_handle_event(DeviceState *dev, QemuConsole *src,
QemuInputEvent *evt)
{
VirtIOInput *vinput = VIRTIO_INPUT(dev);
virtio_input_event event;
switch (evt->type) {
case INPUT_EVENT_KIND_KEY:
event.type = cpu_to_le16(EV_KEY);
event.code = cpu_to_le16(evt->key.key);
event.value = cpu_to_le32(evt->key.down ? 1 : 0);
virtio_input_send(vinput, &event);
break;
case INPUT_EVENT_KIND_BTN:
if ((evt->btn.button == INPUT_BUTTON_WHEEL_UP ||
evt->btn.button == INPUT_BUTTON_WHEEL_DOWN) &&
evt->btn.down) {
event.type = cpu_to_le16(EV_REL);
event.code = cpu_to_le16(REL_WHEEL);
event.value = cpu_to_le32(evt->btn.button == INPUT_BUTTON_WHEEL_UP
? 1 : -1);
virtio_input_send(vinput, &event);
} else if (keymap_button[evt->btn.button]) {
event.type = cpu_to_le16(EV_KEY);
event.code = cpu_to_le16(keymap_button[evt->btn.button]);
event.value = cpu_to_le32(evt->btn.down ? 1 : 0);
virtio_input_send(vinput, &event);
} else {
if (evt->btn.down) {
fprintf(stderr, "%s: unmapped button: %d [%s]\n", __func__,
evt->btn.button,
InputButton_str(evt->btn.button));
}
}
break;
case INPUT_EVENT_KIND_REL:
event.type = cpu_to_le16(EV_REL);
event.code = cpu_to_le16(axismap_rel[evt->rel.axis]);
event.value = cpu_to_le32(evt->rel.value);
virtio_input_send(vinput, &event);
break;
case INPUT_EVENT_KIND_ABS:
event.type = cpu_to_le16(EV_ABS);
event.code = cpu_to_le16(axismap_abs[evt->abs.axis]);
event.value = cpu_to_le32(evt->abs.value);
virtio_input_send(vinput, &event);
break;
case INPUT_EVENT_KIND_MTT:
if (evt->mtt.type == INPUT_MULTI_TOUCH_TYPE_DATA) {
event.type = cpu_to_le16(EV_ABS);
event.code = cpu_to_le16(axismap_tch[evt->mtt.axis]);
event.value = cpu_to_le32(evt->mtt.value);
virtio_input_send(vinput, &event);
} else {
event.type = cpu_to_le16(EV_ABS);
event.code = cpu_to_le16(ABS_MT_SLOT);
event.value = cpu_to_le32(evt->mtt.slot);
virtio_input_send(vinput, &event);
event.type = cpu_to_le16(EV_ABS);
event.code = cpu_to_le16(ABS_MT_TRACKING_ID);
event.value = cpu_to_le32(evt->mtt.tracking_id);
virtio_input_send(vinput, &event);
}
break;
default:
/* keep gcc happy */
break;
}
}
static void virtio_input_handle_sync(DeviceState *dev)
{
VirtIOInput *vinput = VIRTIO_INPUT(dev);
virtio_input_event event = {
.type = cpu_to_le16(EV_SYN),
.code = cpu_to_le16(SYN_REPORT),
.value = 0,
};
virtio_input_send(vinput, &event);
}
static void virtio_input_hid_realize(DeviceState *dev, Error **errp)
{
VirtIOInputHID *vhid = VIRTIO_INPUT_HID(dev);
vhid->hs = qemu_input_handler_register(dev, vhid->handler);
if (vhid->display && vhid->hs) {
qemu_input_handler_bind(vhid->hs, vhid->display, vhid->head, NULL);
}
}
static void virtio_input_hid_unrealize(DeviceState *dev)
{
VirtIOInputHID *vhid = VIRTIO_INPUT_HID(dev);
qemu_input_handler_unregister(vhid->hs);
}
static void virtio_input_hid_change_active(VirtIOInput *vinput)
{
VirtIOInputHID *vhid = VIRTIO_INPUT_HID(vinput);
if (vinput->active) {
qemu_input_handler_activate(vhid->hs);
} else {
qemu_input_handler_deactivate(vhid->hs);
}
}
static void virtio_input_hid_handle_status(VirtIOInput *vinput,
virtio_input_event *event)
{
VirtIOInputHID *vhid = VIRTIO_INPUT_HID(vinput);
int ledbit = 0;
switch (le16_to_cpu(event->type)) {
case EV_LED:
if (event->code == LED_NUML) {
ledbit = QEMU_NUM_LOCK_LED;
} else if (event->code == LED_CAPSL) {
ledbit = QEMU_CAPS_LOCK_LED;
} else if (event->code == LED_SCROLLL) {
ledbit = QEMU_SCROLL_LOCK_LED;
}
if (event->value) {
vhid->ledstate |= ledbit;
} else {
vhid->ledstate &= ~ledbit;
}
kbd_put_ledstate(vhid->ledstate);
break;
default:
fprintf(stderr, "%s: unknown type %d\n", __func__,
le16_to_cpu(event->type));
break;
}
}
static const Property virtio_input_hid_properties[] = {
DEFINE_PROP_STRING("display", VirtIOInputHID, display),
DEFINE_PROP_UINT32("head", VirtIOInputHID, head, 0),
};
static void virtio_input_hid_class_init(ObjectClass *klass, const void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VirtIOInputClass *vic = VIRTIO_INPUT_CLASS(klass);
device_class_set_props(dc, virtio_input_hid_properties);
vic->realize = virtio_input_hid_realize;
vic->unrealize = virtio_input_hid_unrealize;
vic->change_active = virtio_input_hid_change_active;
vic->handle_status = virtio_input_hid_handle_status;
}
static const TypeInfo virtio_input_hid_info = {
.name = TYPE_VIRTIO_INPUT_HID,
.parent = TYPE_VIRTIO_INPUT,
.instance_size = sizeof(VirtIOInputHID),
.class_init = virtio_input_hid_class_init,
.abstract = true,
};
/* ----------------------------------------------------------------- */
static const QemuInputHandler virtio_keyboard_handler = {
.name = VIRTIO_ID_NAME_KEYBOARD,
.mask = INPUT_EVENT_MASK_KEY,
.event = virtio_input_handle_event,
.sync = virtio_input_handle_sync,
};
static struct virtio_input_config virtio_keyboard_config[] = {
{
.select = VIRTIO_INPUT_CFG_ID_NAME,
.size = sizeof(VIRTIO_ID_NAME_KEYBOARD),
.u.string = VIRTIO_ID_NAME_KEYBOARD,
},{
.select = VIRTIO_INPUT_CFG_ID_DEVIDS,
.size = sizeof(struct virtio_input_devids),
.u.ids = {
.bustype = const_le16(BUS_VIRTUAL),
.vendor = const_le16(0x0627), /* same we use for usb hid devices */
.product = const_le16(0x0001),
.version = const_le16(0x0001),
},
},{
.select = VIRTIO_INPUT_CFG_EV_BITS,
.subsel = EV_REP,
.size = 1,
},{
.select = VIRTIO_INPUT_CFG_EV_BITS,
.subsel = EV_LED,
.size = 1,
.u.bitmap = {
(1 << LED_NUML) | (1 << LED_CAPSL) | (1 << LED_SCROLLL),
},
},
{ /* end of list */ },
};
static void virtio_keyboard_init(Object *obj)
{
VirtIOInputHID *vhid = VIRTIO_INPUT_HID(obj);
VirtIOInput *vinput = VIRTIO_INPUT(obj);
virtio_input_config ext = {
.select = VIRTIO_INPUT_CFG_EV_BITS,
.subsel = EV_KEY,
.size = DIV_ROUND_UP(KEY_REPLY, 8)
};
unsigned int i;
vhid->handler = &virtio_keyboard_handler;
virtio_input_init_config(vinput, virtio_keyboard_config);
/*
* Cover as many keys as possible since we cannot tell what keys the host
* supports. This follows Linux xen-kbdfront's approach:
* https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/diff/drivers/input/xen-kbdfront.c?id=4ee36dc08e5c4d16d078f59acd6d9d536f9718dd
*
* Stop before KEY_REPLY for migration compatibility.
*/
for (i = KEY_ESC; i < KEY_REPLY; i++) {
ext.u.bitmap[i / 8] |= (1 << (i % 8));
}
virtio_input_add_config(vinput, &ext);
}
static const TypeInfo virtio_keyboard_info = {
.name = TYPE_VIRTIO_KEYBOARD,
.parent = TYPE_VIRTIO_INPUT_HID,
.instance_size = sizeof(VirtIOInputHID),
.instance_init = virtio_keyboard_init,
};
/* ----------------------------------------------------------------- */
static const QemuInputHandler virtio_mouse_handler = {
.name = VIRTIO_ID_NAME_MOUSE,
.mask = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_REL,
.event = virtio_input_handle_event,
.sync = virtio_input_handle_sync,
};
static struct virtio_input_config virtio_mouse_config[] = {
{
.select = VIRTIO_INPUT_CFG_ID_NAME,
.size = sizeof(VIRTIO_ID_NAME_MOUSE),
.u.string = VIRTIO_ID_NAME_MOUSE,
},{
.select = VIRTIO_INPUT_CFG_ID_DEVIDS,
.size = sizeof(struct virtio_input_devids),
.u.ids = {
.bustype = const_le16(BUS_VIRTUAL),
.vendor = const_le16(0x0627), /* same we use for usb hid devices */
.product = const_le16(0x0002),
.version = const_le16(0x0002),
},
},{
.select = VIRTIO_INPUT_CFG_EV_BITS,
.subsel = EV_REL,
.size = 2,
.u.bitmap = {
(1 << REL_X) | (1 << REL_Y),
(1 << (REL_WHEEL - 8))
},
},
{ /* end of list */ },
};
static void virtio_mouse_init(Object *obj)
{
VirtIOInputHID *vhid = VIRTIO_INPUT_HID(obj);
VirtIOInput *vinput = VIRTIO_INPUT(obj);
vhid->handler = &virtio_mouse_handler;
virtio_input_init_config(vinput, virtio_mouse_config);
virtio_input_extend_config(vinput, keymap_button,
ARRAY_SIZE(keymap_button),
VIRTIO_INPUT_CFG_EV_BITS, EV_KEY);
}
static const TypeInfo virtio_mouse_info = {
.name = TYPE_VIRTIO_MOUSE,
.parent = TYPE_VIRTIO_INPUT_HID,
.instance_size = sizeof(VirtIOInputHID),
.instance_init = virtio_mouse_init,
};
/* ----------------------------------------------------------------- */
static const QemuInputHandler virtio_tablet_handler = {
.name = VIRTIO_ID_NAME_TABLET,
.mask = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_ABS,
.event = virtio_input_handle_event,
.sync = virtio_input_handle_sync,
};
static struct virtio_input_config virtio_tablet_config[] = {
{
.select = VIRTIO_INPUT_CFG_ID_NAME,
.size = sizeof(VIRTIO_ID_NAME_TABLET),
.u.string = VIRTIO_ID_NAME_TABLET,
},{
.select = VIRTIO_INPUT_CFG_ID_DEVIDS,
.size = sizeof(struct virtio_input_devids),
.u.ids = {
.bustype = const_le16(BUS_VIRTUAL),
.vendor = const_le16(0x0627), /* same we use for usb hid devices */
.product = const_le16(0x0003),
.version = const_le16(0x0002),
},
},{
.select = VIRTIO_INPUT_CFG_EV_BITS,
.subsel = EV_ABS,
.size = 1,
.u.bitmap = {
(1 << ABS_X) | (1 << ABS_Y),
},
},{
.select = VIRTIO_INPUT_CFG_EV_BITS,
.subsel = EV_REL,
.size = 2,
.u.bitmap = {
0,
(1 << (REL_WHEEL - 8))
},
},{
.select = VIRTIO_INPUT_CFG_ABS_INFO,
.subsel = ABS_X,
.size = sizeof(virtio_input_absinfo),
.u.abs.min = const_le32(INPUT_EVENT_ABS_MIN),
.u.abs.max = const_le32(INPUT_EVENT_ABS_MAX),
},{
.select = VIRTIO_INPUT_CFG_ABS_INFO,
.subsel = ABS_Y,
.size = sizeof(virtio_input_absinfo),
.u.abs.min = const_le32(INPUT_EVENT_ABS_MIN),
.u.abs.max = const_le32(INPUT_EVENT_ABS_MAX),
},
{ /* end of list */ },
};
static void virtio_tablet_init(Object *obj)
{
VirtIOInputHID *vhid = VIRTIO_INPUT_HID(obj);
VirtIOInput *vinput = VIRTIO_INPUT(obj);
vhid->handler = &virtio_tablet_handler;
virtio_input_init_config(vinput, virtio_tablet_config);
virtio_input_extend_config(vinput, keymap_button,
ARRAY_SIZE(keymap_button),
VIRTIO_INPUT_CFG_EV_BITS, EV_KEY);
}
static const TypeInfo virtio_tablet_info = {
.name = TYPE_VIRTIO_TABLET,
.parent = TYPE_VIRTIO_INPUT_HID,
.instance_size = sizeof(VirtIOInputHID),
.instance_init = virtio_tablet_init,
};
/* ----------------------------------------------------------------- */
static const QemuInputHandler virtio_multitouch_handler = {
.name = VIRTIO_ID_NAME_MULTITOUCH,
.mask = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_MTT,
.event = virtio_input_handle_event,
.sync = virtio_input_handle_sync,
};
static struct virtio_input_config virtio_multitouch_config[] = {
{
.select = VIRTIO_INPUT_CFG_ID_NAME,
.size = sizeof(VIRTIO_ID_NAME_MULTITOUCH),
.u.string = VIRTIO_ID_NAME_MULTITOUCH,
},{
.select = VIRTIO_INPUT_CFG_ID_DEVIDS,
.size = sizeof(struct virtio_input_devids),
.u.ids = {
.bustype = const_le16(BUS_VIRTUAL),
.vendor = const_le16(0x0627), /* same we use for usb hid devices */
.product = const_le16(0x0003),
.version = const_le16(0x0001),
},
},{
.select = VIRTIO_INPUT_CFG_ABS_INFO,
.subsel = ABS_MT_SLOT,
.size = sizeof(virtio_input_absinfo),
.u.abs.min = const_le32(INPUT_EVENT_SLOTS_MIN),
.u.abs.max = const_le32(INPUT_EVENT_SLOTS_MAX),
},{
.select = VIRTIO_INPUT_CFG_ABS_INFO,
.subsel = ABS_MT_TRACKING_ID,
.size = sizeof(virtio_input_absinfo),
.u.abs.min = const_le32(INPUT_EVENT_SLOTS_MIN),
.u.abs.max = const_le32(INPUT_EVENT_SLOTS_MAX),
},{
.select = VIRTIO_INPUT_CFG_ABS_INFO,
.subsel = ABS_MT_POSITION_X,
.size = sizeof(virtio_input_absinfo),
.u.abs.min = const_le32(INPUT_EVENT_ABS_MIN),
.u.abs.max = const_le32(INPUT_EVENT_ABS_MAX),
},{
.select = VIRTIO_INPUT_CFG_ABS_INFO,
.subsel = ABS_MT_POSITION_Y,
.size = sizeof(virtio_input_absinfo),
.u.abs.min = const_le32(INPUT_EVENT_ABS_MIN),
.u.abs.max = const_le32(INPUT_EVENT_ABS_MAX),
},
{ /* end of list */ },
};
static void virtio_multitouch_init(Object *obj)
{
VirtIOInputHID *vhid = VIRTIO_INPUT_HID(obj);
VirtIOInput *vinput = VIRTIO_INPUT(obj);
unsigned short abs_props[] = {
INPUT_PROP_DIRECT,
};
unsigned short abs_bits[] = {
ABS_MT_SLOT,
ABS_MT_TRACKING_ID,
ABS_MT_POSITION_X,
ABS_MT_POSITION_Y,
};
vhid->handler = &virtio_multitouch_handler;
virtio_input_init_config(vinput, virtio_multitouch_config);
virtio_input_extend_config(vinput, keymap_button,
ARRAY_SIZE(keymap_button),
VIRTIO_INPUT_CFG_EV_BITS, EV_KEY);
virtio_input_extend_config(vinput, abs_props,
ARRAY_SIZE(abs_props),
VIRTIO_INPUT_CFG_PROP_BITS, 0);
virtio_input_extend_config(vinput, abs_bits,
ARRAY_SIZE(abs_bits),
VIRTIO_INPUT_CFG_EV_BITS, EV_ABS);
}
static const TypeInfo virtio_multitouch_info = {
.name = TYPE_VIRTIO_MULTITOUCH,
.parent = TYPE_VIRTIO_INPUT_HID,
.instance_size = sizeof(VirtIOInputHID),
.instance_init = virtio_multitouch_init,
};
/* ----------------------------------------------------------------- */
static void virtio_register_types(void)
{
type_register_static(&virtio_input_hid_info);
type_register_static(&virtio_keyboard_info);
type_register_static(&virtio_mouse_info);
type_register_static(&virtio_tablet_info);
type_register_static(&virtio_multitouch_info);
}
type_init(virtio_register_types)
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