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ps2: Initial horizontal scroll support 

This change adds support for horizontal scroll to ps/2 mouse device
code. The code is implemented to match the logic of linux kernel
which is used as a reference.

Signed-off-by: Dmitry Petrov <dpetroff@gmail.com>
Message-Id: <20220108153947.171861-2-dpetroff@gmail.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Dmitry Petrov 2022-01-08 16:39:43 +01:00 committed by Gerd Hoffmann
parent f0602b7099
commit 64ebbb7d62
2 changed files with 50 additions and 9 deletions
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57
hw/input/ps2.c
View File

@ -123,6 +123,7 @@ typedef struct {
int mouse_dx; /* current values, needed for 'poll' mode */
int mouse_dy;
int mouse_dz;
int mouse_dw;
uint8_t mouse_buttons;
} PS2MouseState;
@ -715,7 +716,7 @@ static int ps2_mouse_send_packet(PS2MouseState *s)
/* IMPS/2 and IMEX send 4 bytes, PS2 sends 3 bytes */
const int needed = s->mouse_type ? 4 : 3;
unsigned int b;
int dx1, dy1, dz1;
int dx1, dy1, dz1, dw1;
if (PS2_QUEUE_SIZE - s->common.queue.count < needed) {
return 0;
@ -724,6 +725,7 @@ static int ps2_mouse_send_packet(PS2MouseState *s)
dx1 = s->mouse_dx;
dy1 = s->mouse_dy;
dz1 = s->mouse_dz;
dw1 = s->mouse_dw;
/* XXX: increase range to 8 bits ? */
if (dx1 > 127)
dx1 = 127;
@ -740,6 +742,9 @@ static int ps2_mouse_send_packet(PS2MouseState *s)
/* extra byte for IMPS/2 or IMEX */
switch(s->mouse_type) {
default:
/* Just ignore the wheels if not supported */
s->mouse_dz = 0;
s->mouse_dw = 0;
break;
case 3:
if (dz1 > 127)
@ -747,13 +752,41 @@ static int ps2_mouse_send_packet(PS2MouseState *s)
else if (dz1 < -127)
dz1 = -127;
ps2_queue_noirq(&s->common, dz1 & 0xff);
s->mouse_dz -= dz1;
s->mouse_dw = 0;
break;
case 4:
if (dz1 > 7)
dz1 = 7;
else if (dz1 < -7)
dz1 = -7;
b = (dz1 & 0x0f) | ((s->mouse_buttons & 0x18) << 1);
/*
* This matches what the Linux kernel expects for exps/2 in
* drivers/input/mouse/psmouse-base.c. Note, if you happen to
* press/release the 4th or 5th buttons at the same moment as a
* horizontal wheel scroll, those button presses will get lost. I'm not
* sure what to do about that, since by this point we don't know
* whether those buttons actually changed state.
*/
if (dw1 != 0) {
if (dw1 > 31) {
dw1 = 31;
} else if (dw1 < -31) {
dw1 = -31;
}
/*
* linux kernel expects first 6 bits to represent the value
* for horizontal scroll
*/
b = (dw1 & 0x3f) | 0x40;
s->mouse_dw -= dw1;
} else {
if (dz1 > 7) {
dz1 = 7;
} else if (dz1 < -7) {
dz1 = -7;
}
b = (dz1 & 0x0f) | ((s->mouse_buttons & 0x18) << 1);
s->mouse_dz -= dz1;
}
ps2_queue_noirq(&s->common, b);
break;
}
@ -764,7 +797,6 @@ static int ps2_mouse_send_packet(PS2MouseState *s)
/* update deltas */
s->mouse_dx -= dx1;
s->mouse_dy -= dy1;
s->mouse_dz -= dz1;
return 1;
}
@ -806,6 +838,12 @@ static void ps2_mouse_event(DeviceState *dev, QemuConsole *src,
} else if (btn->button == INPUT_BUTTON_WHEEL_DOWN) {
s->mouse_dz++;
}
if (btn->button == INPUT_BUTTON_WHEEL_RIGHT) {
s->mouse_dw--;
} else if (btn->button == INPUT_BUTTON_WHEEL_LEFT) {
s->mouse_dw++;
}
} else {
s->mouse_buttons &= ~bmap[btn->button];
}
@ -833,8 +871,10 @@ static void ps2_mouse_sync(DeviceState *dev)
/* if not remote, send event. Multiple events are sent if
too big deltas */
while (ps2_mouse_send_packet(s)) {
if (s->mouse_dx == 0 && s->mouse_dy == 0 && s->mouse_dz == 0)
if (s->mouse_dx == 0 && s->mouse_dy == 0
&& s->mouse_dz == 0 && s->mouse_dw == 0) {
break;
}
}
}
}
@ -1036,6 +1076,7 @@ static void ps2_mouse_reset(void *opaque)
s->mouse_dx = 0;
s->mouse_dy = 0;
s->mouse_dz = 0;
s->mouse_dw = 0;
s->mouse_buttons = 0;
}

2
qapi/ui.json
View File

@ -905,7 +905,7 @@
##
{ 'enum' : 'InputButton',
'data' : [ 'left', 'middle', 'right', 'wheel-up', 'wheel-down', 'side',
'extra' ] }
'extra', 'wheel-left', 'wheel-right' ] }
##
# @InputAxis: