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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>
This commit is contained in:
Philippe Voinov 2017-05-05 15:42:31 +02:00 committed by Gerd Hoffmann
parent 9cfa7ab939
commit d755defd5d
1 changed files with 24 additions and 1 deletions
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25
ui/input-linux.c
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@ -169,6 +169,10 @@ struct InputLinux {
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;
@ -314,6 +318,18 @@ static void input_linux_handle_mouse(InputLinux *il, struct input_event *event)
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) {
@ -351,7 +367,7 @@ static void input_linux_event(void *opaque)
if (il->num_keys) {
input_linux_handle_keyboard(il, &il->event);
}
if (il->has_rel_x && il->num_btns) {
if ((il->has_rel_x || il->has_abs_x) && il->num_btns) {
input_linux_handle_mouse(il, &il->event);
}
}
@ -364,6 +380,7 @@ static void input_linux_complete(UserCreatable *uc, Error **errp)
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");
@ -402,6 +419,12 @@ static void input_linux_complete(UserCreatable *uc, Error **errp)
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;
}
}