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qemu-e2k/chardev/msmouse.c

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/*
* QEMU Microsoft serial mouse emulation
*
* Copyright (c) 2008 Lubomir Rintel
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "qemu/module.h"
#include "qemu/fifo8.h"
#include "chardev/char.h"
#include "chardev/char-serial.h"
#include "ui/console.h"
#include "ui/input.h"
#include "qom/object.h"
#define MSMOUSE_LO6(n) ((n) & 0x3f)
#define MSMOUSE_HI2(n) (((n) & 0xc0) >> 6)
#define MSMOUSE_PWR(cm) (cm & (CHR_TIOCM_RTS | CHR_TIOCM_DTR))
/* Serial PnP for 6 bit devices/mice sends all ASCII chars - 0x20 */
#define M(c) (c - 0x20)
/* Serial fifo size. */
#define MSMOUSE_BUF_SZ 64
/* Mouse ID: Send "M3" cause we behave like a 3 button logitech mouse. */
const uint8_t mouse_id[] = {'M', '3'};
/*
* PnP start "(", PnP version (1.0), vendor ID, product ID, '\\',
* serial ID (omitted), '\\', MS class name, '\\', driver ID (omitted), '\\',
* product description, checksum, ")"
* Missing parts are inserted later.
*/
const uint8_t pnp_data[] = {M('('), 1, '$', M('Q'), M('M'), M('U'),
M('0'), M('0'), M('0'), M('1'),
M('\\'), M('\\'),
M('M'), M('O'), M('U'), M('S'), M('E'),
M('\\'), M('\\')};
struct MouseChardev {
Chardev parent;
QemuInputHandlerState *hs;
int tiocm;
int axis[INPUT_AXIS__MAX];
bool btns[INPUT_BUTTON__MAX];
bool btnc[INPUT_BUTTON__MAX];
Fifo8 outbuf;
};
typedef struct MouseChardev MouseChardev;
#define TYPE_CHARDEV_MSMOUSE "chardev-msmouse"
DECLARE_INSTANCE_CHECKER(MouseChardev, MOUSE_CHARDEV,
TYPE_CHARDEV_MSMOUSE)
static void msmouse_chr_accept_input(Chardev *chr)
{
MouseChardev *mouse = MOUSE_CHARDEV(chr);
uint32_t len, avail;
len = qemu_chr_be_can_write(chr);
avail = fifo8_num_used(&mouse->outbuf);
while (len > 0 && avail > 0) {
const uint8_t *buf;
uint32_t size;
buf = fifo8_pop_buf(&mouse->outbuf, MIN(len, avail), &size);
qemu_chr_be_write(chr, buf, size);
len = qemu_chr_be_can_write(chr);
avail -= size;
}
}
static void msmouse_queue_event(MouseChardev *mouse)
{
unsigned char bytes[4] = { 0x40, 0x00, 0x00, 0x00 };
int dx, dy, count = 3;
dx = mouse->axis[INPUT_AXIS_X];
mouse->axis[INPUT_AXIS_X] = 0;
dy = mouse->axis[INPUT_AXIS_Y];
mouse->axis[INPUT_AXIS_Y] = 0;
/* Movement deltas */
bytes[0] |= (MSMOUSE_HI2(dy) << 2) | MSMOUSE_HI2(dx);
bytes[1] |= MSMOUSE_LO6(dx);
bytes[2] |= MSMOUSE_LO6(dy);
/* Buttons */
bytes[0] |= (mouse->btns[INPUT_BUTTON_LEFT] ? 0x20 : 0x00);
bytes[0] |= (mouse->btns[INPUT_BUTTON_RIGHT] ? 0x10 : 0x00);
if (mouse->btns[INPUT_BUTTON_MIDDLE] ||
mouse->btnc[INPUT_BUTTON_MIDDLE]) {
bytes[3] |= (mouse->btns[INPUT_BUTTON_MIDDLE] ? 0x20 : 0x00);
mouse->btnc[INPUT_BUTTON_MIDDLE] = false;
count++;
}
if (fifo8_num_free(&mouse->outbuf) >= count) {
fifo8_push_all(&mouse->outbuf, bytes, count);
} else {
/* queue full -> drop event */
}
}
static void msmouse_input_event(DeviceState *dev, QemuConsole *src,
InputEvent *evt)
{
MouseChardev *mouse = MOUSE_CHARDEV(dev);
InputMoveEvent *move;
InputBtnEvent *btn;
/* Ignore events if serial mouse powered down. */
if (!MSMOUSE_PWR(mouse->tiocm)) {
return;
}
switch (evt->type) {
case INPUT_EVENT_KIND_REL:
move = evt->u.rel.data;
mouse->axis[move->axis] += move->value;
break;
case INPUT_EVENT_KIND_BTN:
btn = evt->u.btn.data;
mouse->btns[btn->button] = btn->down;
mouse->btnc[btn->button] = true;
break;
default:
/* keep gcc happy */
break;
}
}
static void msmouse_input_sync(DeviceState *dev)
{
MouseChardev *mouse = MOUSE_CHARDEV(dev);
Chardev *chr = CHARDEV(dev);
/* Ignore events if serial mouse powered down. */
if (!MSMOUSE_PWR(mouse->tiocm)) {
return;
}
msmouse_queue_event(mouse);
msmouse_chr_accept_input(chr);
}
static int msmouse_chr_write(struct Chardev *s, const uint8_t *buf, int len)
{
/* Ignore writes to mouse port */
return len;
}
static QemuInputHandler msmouse_handler = {
.name = "QEMU Microsoft Mouse",
.mask = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_REL,
.event = msmouse_input_event,
.sync = msmouse_input_sync,
};
static int msmouse_ioctl(Chardev *chr, int cmd, void *arg)
{
MouseChardev *mouse = MOUSE_CHARDEV(chr);
int c, i, j;
uint8_t bytes[MSMOUSE_BUF_SZ / 2];
int *targ = (int *)arg;
const uint8_t hexchr[16] = {M('0'), M('1'), M('2'), M('3'), M('4'), M('5'),
M('6'), M('7'), M('8'), M('9'), M('A'), M('B'),
M('C'), M('D'), M('E'), M('F')};
switch (cmd) {
case CHR_IOCTL_SERIAL_SET_TIOCM:
c = mouse->tiocm;
mouse->tiocm = *(int *)arg;
if (MSMOUSE_PWR(mouse->tiocm)) {
if (!MSMOUSE_PWR(c)) {
/*
* Power on after reset: Send ID and PnP data
* No need to check fifo space as it is empty at this point.
*/
fifo8_push_all(&mouse->outbuf, mouse_id, sizeof(mouse_id));
/* Add PnP data: */
fifo8_push_all(&mouse->outbuf, pnp_data, sizeof(pnp_data));
/*
* Add device description from qemu handler name.
* Make sure this all fits into the queue beforehand!
*/
c = M(')');
for (i = 0; msmouse_handler.name[i]; i++) {
bytes[i] = M(msmouse_handler.name[i]);
c += bytes[i];
}
/* Calc more of checksum */
for (j = 0; j < sizeof(pnp_data); j++) {
c += pnp_data[j];
}
c &= 0xff;
bytes[i++] = hexchr[c >> 4];
bytes[i++] = hexchr[c & 0x0f];
bytes[i++] = M(')');
fifo8_push_all(&mouse->outbuf, bytes, i);
/* Start sending data to serial. */
msmouse_chr_accept_input(chr);
}
break;
}
/*
* Reset mouse buffers on power down.
* Mouse won't send anything without power.
*/
fifo8_reset(&mouse->outbuf);
memset(mouse->axis, 0, sizeof(mouse->axis));
memset(mouse->btns, false, sizeof(mouse->btns));
memset(mouse->btnc, false, sizeof(mouse->btns));
break;
case CHR_IOCTL_SERIAL_GET_TIOCM:
/* Remember line control status. */
*targ = mouse->tiocm;
break;
default:
return -ENOTSUP;
}
return 0;
}
static void char_msmouse_finalize(Object *obj)
{
MouseChardev *mouse = MOUSE_CHARDEV(obj);
if (mouse->hs) {
qemu_input_handler_unregister(mouse->hs);
}
fifo8_destroy(&mouse->outbuf);
}
static void msmouse_chr_open(Chardev *chr,
ChardevBackend *backend,
bool *be_opened,
Error **errp)
{
MouseChardev *mouse = MOUSE_CHARDEV(chr);
*be_opened = false;
mouse->hs = qemu_input_handler_register((DeviceState *)mouse,
&msmouse_handler);
mouse->tiocm = 0;
fifo8_create(&mouse->outbuf, MSMOUSE_BUF_SZ);
}
static void char_msmouse_class_init(ObjectClass *oc, void *data)
{
ChardevClass *cc = CHARDEV_CLASS(oc);
cc->open = msmouse_chr_open;
cc->chr_write = msmouse_chr_write;
cc->chr_accept_input = msmouse_chr_accept_input;
cc->chr_ioctl = msmouse_ioctl;
}
static const TypeInfo char_msmouse_type_info = {
.name = TYPE_CHARDEV_MSMOUSE,
.parent = TYPE_CHARDEV,
.instance_size = sizeof(MouseChardev),
.instance_finalize = char_msmouse_finalize,
.class_init = char_msmouse_class_init,
};
static void register_types(void)
{
type_register_static(&char_msmouse_type_info);
}
type_init(register_types);
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