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qemu/chardev/wctablet.c

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/*
* QEMU Wacom Penpartner serial tablet emulation
*
* some protocol details:
* http://linuxwacom.sourceforge.net/wiki/index.php/Serial_Protocol_IV
*
* Copyright (c) 2016 Anatoli Huseu1
* Copyright (c) 2016,17 Gerd Hoffmann
*
* 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 "chardev/char-serial.h"
#include "ui/console.h"
#include "ui/input.h"
#include "trace.h"
#define WC_OUTPUT_BUF_MAX_LEN 512
#define WC_COMMAND_MAX_LEN 60
#define WC_L7(n) ((n) & 127)
#define WC_M7(n) (((n) >> 7) & 127)
#define WC_H2(n) ((n) >> 14)
#define WC_L4(n) ((n) & 15)
#define WC_H4(n) (((n) >> 4) & 15)
/* Model string and config string */
#define WC_MODEL_STRING_LENGTH 18
uint8_t WC_MODEL_STRING[WC_MODEL_STRING_LENGTH + 1] = "~#CT-0045R,V1.3-5,";
#define WC_CONFIG_STRING_LENGTH 8
uint8_t WC_CONFIG_STRING[WC_CONFIG_STRING_LENGTH + 1] = "96,N,8,0";
#define WC_FULL_CONFIG_STRING_LENGTH 61
uint8_t WC_FULL_CONFIG_STRING[WC_FULL_CONFIG_STRING_LENGTH + 1] = {
0x5c, 0x39, 0x36, 0x2c, 0x4e, 0x2c, 0x38, 0x2c,
0x31, 0x28, 0x01, 0x24, 0x57, 0x41, 0x43, 0x30,
0x30, 0x34, 0x35, 0x5c, 0x5c, 0x50, 0x45, 0x4e, 0x5c,
0x57, 0x41, 0x43, 0x30, 0x30, 0x30, 0x30, 0x5c,
0x54, 0x61, 0x62, 0x6c, 0x65, 0x74, 0x0d, 0x0a,
0x43, 0x54, 0x2d, 0x30, 0x30, 0x34, 0x35, 0x52,
0x2c, 0x56, 0x31, 0x2e, 0x33, 0x2d, 0x35, 0x0d,
0x0a, 0x45, 0x37, 0x29
};
/* This structure is used to save private info for Wacom Tablet. */
typedef struct {
Chardev parent;
QemuInputHandlerState *hs;
/* Query string from serial */
uint8_t query[100];
int query_index;
/* Command to be sent to serial port */
uint8_t outbuf[WC_OUTPUT_BUF_MAX_LEN];
int outlen;
int line_speed;
bool send_events;
int axis[INPUT_AXIS__MAX];
bool btns[INPUT_BUTTON__MAX];
} TabletChardev;
#define TYPE_CHARDEV_WCTABLET "chardev-wctablet"
#define WCTABLET_CHARDEV(obj) \
OBJECT_CHECK(TabletChardev, (obj), TYPE_CHARDEV_WCTABLET)
static void wctablet_chr_accept_input(Chardev *chr);
static void wctablet_shift_input(TabletChardev *tablet, int count)
{
tablet->query_index -= count;
memmove(tablet->query, tablet->query + count, tablet->query_index);
tablet->query[tablet->query_index] = 0;
}
static void wctablet_queue_output(TabletChardev *tablet, uint8_t *buf, int count)
{
if (tablet->outlen + count > sizeof(tablet->outbuf)) {
return;
}
memcpy(tablet->outbuf + tablet->outlen, buf, count);
tablet->outlen += count;
wctablet_chr_accept_input(CHARDEV(tablet));
}
static void wctablet_reset(TabletChardev *tablet)
{
/* clear buffers */
tablet->query_index = 0;
tablet->outlen = 0;
/* reset state */
tablet->send_events = false;
}
static void wctablet_queue_event(TabletChardev *tablet)
{
uint8_t codes[8] = { 0xe0, 0, 0, 0, 0, 0, 0 };
if (tablet->line_speed != 9600) {
return;
}
int newX = tablet->axis[INPUT_AXIS_X] * 0.1537;
int nexY = tablet->axis[INPUT_AXIS_Y] * 0.1152;
codes[0] = codes[0] | WC_H2(newX);
codes[1] = codes[1] | WC_M7(newX);
codes[2] = codes[2] | WC_L7(newX);
codes[3] = codes[3] | WC_H2(nexY);
codes[4] = codes[4] | WC_M7(nexY);
codes[5] = codes[5] | WC_L7(nexY);
if (tablet->btns[INPUT_BUTTON_LEFT]) {
codes[0] = 0xa0;
}
wctablet_queue_output(tablet, codes, 7);
}
static void wctablet_input_event(DeviceState *dev, QemuConsole *src,
InputEvent *evt)
{
TabletChardev *tablet = (TabletChardev *)dev;
InputMoveEvent *move;
InputBtnEvent *btn;
switch (evt->type) {
case INPUT_EVENT_KIND_ABS:
move = evt->u.abs.data;
tablet->axis[move->axis] = move->value;
break;
case INPUT_EVENT_KIND_BTN:
btn = evt->u.btn.data;
tablet->btns[btn->button] = btn->down;
break;
default:
/* keep gcc happy */
break;
}
}
static void wctablet_input_sync(DeviceState *dev)
{
TabletChardev *tablet = (TabletChardev *)dev;
if (tablet->send_events) {
wctablet_queue_event(tablet);
}
}
static QemuInputHandler wctablet_handler = {
.name = "QEMU Wacom Pen Tablet",
.mask = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_ABS,
.event = wctablet_input_event,
.sync = wctablet_input_sync,
};
static void wctablet_chr_accept_input(Chardev *chr)
{
TabletChardev *tablet = WCTABLET_CHARDEV(chr);
int len, canWrite;
canWrite = qemu_chr_be_can_write(chr);
len = canWrite;
if (len > tablet->outlen) {
len = tablet->outlen;
}
if (len) {
qemu_chr_be_write(chr, tablet->outbuf, len);
tablet->outlen -= len;
if (tablet->outlen) {
memmove(tablet->outbuf, tablet->outbuf + len, tablet->outlen);
}
}
}
static int wctablet_chr_write(struct Chardev *chr,
const uint8_t *buf, int len)
{
TabletChardev *tablet = WCTABLET_CHARDEV(chr);
unsigned int i, clen;
char *pos;
if (tablet->line_speed != 9600) {
return len;
}
for (i = 0; i < len && tablet->query_index < sizeof(tablet->query) - 1; i++) {
tablet->query[tablet->query_index++] = buf[i];
}
tablet->query[tablet->query_index] = 0;
while (tablet->query_index > 0 && (tablet->query[0] == '@' ||
tablet->query[0] == '\r' ||
tablet->query[0] == '\n')) {
wctablet_shift_input(tablet, 1);
}
if (!tablet->query_index) {
return len;
}
if (strncmp((char *)tablet->query, "~#", 2) == 0) {
/* init / detect sequence */
trace_wct_init();
wctablet_shift_input(tablet, 2);
wctablet_queue_output(tablet, WC_MODEL_STRING,
WC_MODEL_STRING_LENGTH);
return len;
}
/* detect line */
pos = strchr((char *)tablet->query, '\r');
if (!pos) {
pos = strchr((char *)tablet->query, '\n');
}
if (!pos) {
return len;
}
clen = pos - (char *)tablet->query;
/* process commands */
if (strncmp((char *)tablet->query, "RE", 2) == 0 &&
clen == 2) {
trace_wct_cmd_re();
wctablet_shift_input(tablet, 3);
wctablet_queue_output(tablet, WC_CONFIG_STRING,
WC_CONFIG_STRING_LENGTH);
} else if (strncmp((char *)tablet->query, "ST", 2) == 0 &&
clen == 2) {
trace_wct_cmd_st();
wctablet_shift_input(tablet, 3);
tablet->send_events = true;
wctablet_queue_event(tablet);
} else if (strncmp((char *)tablet->query, "SP", 2) == 0 &&
clen == 2) {
trace_wct_cmd_sp();
wctablet_shift_input(tablet, 3);
tablet->send_events = false;
} else if (strncmp((char *)tablet->query, "TS", 2) == 0 &&
clen == 3) {
unsigned int input = tablet->query[2];
uint8_t codes[7] = {
0xa3,
((input & 0x80) == 0) ? 0x7e : 0x7f,
(((WC_H4(input) & 0x7) ^ 0x5) << 4) | (WC_L4(input) ^ 0x7),
0x03,
0x7f,
0x7f,
0x00,
};
trace_wct_cmd_ts(input);
wctablet_shift_input(tablet, 4);
wctablet_queue_output(tablet, codes, 7);
} else {
tablet->query[clen] = 0; /* terminate line for printing */
trace_wct_cmd_other((char *)tablet->query);
wctablet_shift_input(tablet, clen + 1);
}
return len;
}
static int wctablet_chr_ioctl(Chardev *chr, int cmd, void *arg)
{
TabletChardev *tablet = WCTABLET_CHARDEV(chr);
QEMUSerialSetParams *ssp;
switch (cmd) {
case CHR_IOCTL_SERIAL_SET_PARAMS:
ssp = arg;
if (tablet->line_speed != ssp->speed) {
trace_wct_speed(ssp->speed);
wctablet_reset(tablet);
tablet->line_speed = ssp->speed;
}
break;
default:
return -ENOTSUP;
}
return 0;
}
static void wctablet_chr_finalize(Object *obj)
{
TabletChardev *tablet = WCTABLET_CHARDEV(obj);
qemu_input_handler_unregister(tablet->hs);
g_free(tablet);
}
static void wctablet_chr_open(Chardev *chr,
ChardevBackend *backend,
bool *be_opened,
Error **errp)
{
TabletChardev *tablet = WCTABLET_CHARDEV(chr);
*be_opened = true;
/* init state machine */
memcpy(tablet->outbuf, WC_FULL_CONFIG_STRING, WC_FULL_CONFIG_STRING_LENGTH);
tablet->outlen = WC_FULL_CONFIG_STRING_LENGTH;
tablet->query_index = 0;
tablet->hs = qemu_input_handler_register((DeviceState *)tablet,
&wctablet_handler);
}
static void wctablet_chr_class_init(ObjectClass *oc, void *data)
{
ChardevClass *cc = CHARDEV_CLASS(oc);
cc->open = wctablet_chr_open;
cc->chr_write = wctablet_chr_write;
cc->chr_ioctl = wctablet_chr_ioctl;
cc->chr_accept_input = wctablet_chr_accept_input;
}
static const TypeInfo wctablet_type_info = {
.name = TYPE_CHARDEV_WCTABLET,
.parent = TYPE_CHARDEV,
.instance_size = sizeof(TabletChardev),
.instance_finalize = wctablet_chr_finalize,
.class_init = wctablet_chr_class_init,
};
static void register_types(void)
{
type_register_static(&wctablet_type_info);
}
type_init(register_types);
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