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qemu/ui/input-linux.c
Philippe Voinov d755defd5d ui: input-linux: Add absolute event support 
This patch adds support for absolute pointer events to the input-linux
subsystem. This support was omitted from the original input-linux patch,
however most of the code required for it is already in place.

Support for absolute events is especially useful for guests with vga
passthrough. Since they have a physical monitor, none of normal channels
for sending video output (vnc, etc) are used, meaning they also can't be
used to send absolute input events. This leaves QMP as the only option
to send absolute input into vga passthrough guests, which is not its
intended use and is not efficient.

This patch allows, for example, uinput to be used to create virtual
absolute input devices. This lets you build external systems which share
physical input devices between guests. Without absolute input
capability, such external systems can't seamlessly share pointer devices
between guests.

Signed-off-by: Philippe Voinov <philippevoinov@gmail.com>
Message-id: 20170505134231.30210-1-philippevoinov@gmail.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2017-05-11 09:42:16 +02:00

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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 "qapi/error.h"
#include "qemu-common.h"
#include "qemu/config-file.h"
#include "qemu/sockets.h"
#include "sysemu/sysemu.h"
#include "ui/input.h"
#include "qom/object_interfaces.h"
#include <sys/ioctl.h>
#include "standard-headers/linux/input.h"
static int linux_to_qcode[KEY_CNT] = {
[KEY_ESC] = Q_KEY_CODE_ESC,
[KEY_1] = Q_KEY_CODE_1,
[KEY_2] = Q_KEY_CODE_2,
[KEY_3] = Q_KEY_CODE_3,
[KEY_4] = Q_KEY_CODE_4,
[KEY_5] = Q_KEY_CODE_5,
[KEY_6] = Q_KEY_CODE_6,
[KEY_7] = Q_KEY_CODE_7,
[KEY_8] = Q_KEY_CODE_8,
[KEY_9] = Q_KEY_CODE_9,
[KEY_0] = Q_KEY_CODE_0,
[KEY_MINUS] = Q_KEY_CODE_MINUS,
[KEY_EQUAL] = Q_KEY_CODE_EQUAL,
[KEY_BACKSPACE] = Q_KEY_CODE_BACKSPACE,
[KEY_TAB] = Q_KEY_CODE_TAB,
[KEY_Q] = Q_KEY_CODE_Q,
[KEY_W] = Q_KEY_CODE_W,
[KEY_E] = Q_KEY_CODE_E,
[KEY_R] = Q_KEY_CODE_R,
[KEY_T] = Q_KEY_CODE_T,
[KEY_Y] = Q_KEY_CODE_Y,
[KEY_U] = Q_KEY_CODE_U,
[KEY_I] = Q_KEY_CODE_I,
[KEY_O] = Q_KEY_CODE_O,
[KEY_P] = Q_KEY_CODE_P,
[KEY_LEFTBRACE] = Q_KEY_CODE_BRACKET_LEFT,
[KEY_RIGHTBRACE] = Q_KEY_CODE_BRACKET_RIGHT,
[KEY_ENTER] = Q_KEY_CODE_RET,
[KEY_LEFTCTRL] = Q_KEY_CODE_CTRL,
[KEY_A] = Q_KEY_CODE_A,
[KEY_S] = Q_KEY_CODE_S,
[KEY_D] = Q_KEY_CODE_D,
[KEY_F] = Q_KEY_CODE_F,
[KEY_G] = Q_KEY_CODE_G,
[KEY_H] = Q_KEY_CODE_H,
[KEY_J] = Q_KEY_CODE_J,
[KEY_K] = Q_KEY_CODE_K,
[KEY_L] = Q_KEY_CODE_L,
[KEY_SEMICOLON] = Q_KEY_CODE_SEMICOLON,
[KEY_APOSTROPHE] = Q_KEY_CODE_APOSTROPHE,
[KEY_GRAVE] = Q_KEY_CODE_GRAVE_ACCENT,
[KEY_LEFTSHIFT] = Q_KEY_CODE_SHIFT,
[KEY_BACKSLASH] = Q_KEY_CODE_BACKSLASH,
[KEY_102ND] = Q_KEY_CODE_LESS,
[KEY_Z] = Q_KEY_CODE_Z,
[KEY_X] = Q_KEY_CODE_X,
[KEY_C] = Q_KEY_CODE_C,
[KEY_V] = Q_KEY_CODE_V,
[KEY_B] = Q_KEY_CODE_B,
[KEY_N] = Q_KEY_CODE_N,
[KEY_M] = Q_KEY_CODE_M,
[KEY_COMMA] = Q_KEY_CODE_COMMA,
[KEY_DOT] = Q_KEY_CODE_DOT,
[KEY_SLASH] = Q_KEY_CODE_SLASH,
[KEY_RIGHTSHIFT] = Q_KEY_CODE_SHIFT_R,
[KEY_LEFTALT] = Q_KEY_CODE_ALT,
[KEY_SPACE] = Q_KEY_CODE_SPC,
[KEY_CAPSLOCK] = Q_KEY_CODE_CAPS_LOCK,
[KEY_F1] = Q_KEY_CODE_F1,
[KEY_F2] = Q_KEY_CODE_F2,
[KEY_F3] = Q_KEY_CODE_F3,
[KEY_F4] = Q_KEY_CODE_F4,
[KEY_F5] = Q_KEY_CODE_F5,
[KEY_F6] = Q_KEY_CODE_F6,
[KEY_F7] = Q_KEY_CODE_F7,
[KEY_F8] = Q_KEY_CODE_F8,
[KEY_F9] = Q_KEY_CODE_F9,
[KEY_F10] = Q_KEY_CODE_F10,
[KEY_NUMLOCK] = Q_KEY_CODE_NUM_LOCK,
[KEY_SCROLLLOCK] = Q_KEY_CODE_SCROLL_LOCK,
[KEY_KP0] = Q_KEY_CODE_KP_0,
[KEY_KP1] = Q_KEY_CODE_KP_1,
[KEY_KP2] = Q_KEY_CODE_KP_2,
[KEY_KP3] = Q_KEY_CODE_KP_3,
[KEY_KP4] = Q_KEY_CODE_KP_4,
[KEY_KP5] = Q_KEY_CODE_KP_5,
[KEY_KP6] = Q_KEY_CODE_KP_6,
[KEY_KP7] = Q_KEY_CODE_KP_7,
[KEY_KP8] = Q_KEY_CODE_KP_8,
[KEY_KP9] = Q_KEY_CODE_KP_9,
[KEY_KPMINUS] = Q_KEY_CODE_KP_SUBTRACT,
[KEY_KPPLUS] = Q_KEY_CODE_KP_ADD,
[KEY_KPDOT] = Q_KEY_CODE_KP_DECIMAL,
[KEY_KPENTER] = Q_KEY_CODE_KP_ENTER,
[KEY_KPSLASH] = Q_KEY_CODE_KP_DIVIDE,
[KEY_KPASTERISK] = Q_KEY_CODE_KP_MULTIPLY,
[KEY_F11] = Q_KEY_CODE_F11,
[KEY_F12] = Q_KEY_CODE_F12,
[KEY_RIGHTCTRL] = Q_KEY_CODE_CTRL_R,
[KEY_SYSRQ] = Q_KEY_CODE_SYSRQ,
[KEY_RIGHTALT] = Q_KEY_CODE_ALT_R,
[KEY_HOME] = Q_KEY_CODE_HOME,
[KEY_UP] = Q_KEY_CODE_UP,
[KEY_PAGEUP] = Q_KEY_CODE_PGUP,
[KEY_LEFT] = Q_KEY_CODE_LEFT,
[KEY_RIGHT] = Q_KEY_CODE_RIGHT,
[KEY_END] = Q_KEY_CODE_END,
[KEY_DOWN] = Q_KEY_CODE_DOWN,
[KEY_PAGEDOWN] = Q_KEY_CODE_PGDN,
[KEY_INSERT] = Q_KEY_CODE_INSERT,
[KEY_DELETE] = Q_KEY_CODE_DELETE,
[KEY_LEFTMETA] = Q_KEY_CODE_META_L,
[KEY_RIGHTMETA] = Q_KEY_CODE_META_R,
[KEY_MENU] = Q_KEY_CODE_MENU,
};
static int qemu_input_linux_to_qcode(unsigned int lnx)
{
assert(lnx < KEY_CNT);
return linux_to_qcode[lnx];
}
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;
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 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) {
int qcode = qemu_input_linux_to_qcode(event->code);
qemu_input_event_send_key_qcode(NULL, qcode, event->value);
}
/* hotkey -> record switch request ... */
if (il->keydown[KEY_LEFTCTRL] &&
il->keydown[KEY_RIGHTCTRL]) {
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 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);
}
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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