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FRET-qemu/hw/usb/dev-wacom.c
Gerd Hoffmann 3f67e2e7f1 usb/hid: avoid dynamic stack allocation 
Use autofree heap allocation instead.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20210503132915.2335822-2-kraxel@redhat.com>
2021-05-04 08:38:23 +02:00

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/*
* Wacom PenPartner USB tablet emulation.
*
* Copyright (c) 2006 Openedhand Ltd.
* Author: Andrzej Zaborowski <balrog@zabor.org>
*
* Based on hw/usb-hid.c:
* Copyright (c) 2005 Fabrice Bellard
*
* 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 "ui/console.h"
#include "hw/usb.h"
#include "hw/usb/hid.h"
#include "migration/vmstate.h"
#include "qemu/module.h"
#include "desc.h"
#include "qom/object.h"
/* Interface requests */
#define WACOM_GET_REPORT 0x2101
#define WACOM_SET_REPORT 0x2109
struct USBWacomState {
USBDevice dev;
USBEndpoint *intr;
QEMUPutMouseEntry *eh_entry;
int dx, dy, dz, buttons_state;
int x, y;
int mouse_grabbed;
enum {
WACOM_MODE_HID = 1,
WACOM_MODE_WACOM = 2,
} mode;
uint8_t idle;
int changed;
};
#define TYPE_USB_WACOM "usb-wacom-tablet"
OBJECT_DECLARE_SIMPLE_TYPE(USBWacomState, USB_WACOM)
enum {
STR_MANUFACTURER = 1,
STR_PRODUCT,
STR_SERIALNUMBER,
};
static const USBDescStrings desc_strings = {
[STR_MANUFACTURER] = "QEMU",
[STR_PRODUCT] = "Wacom PenPartner",
[STR_SERIALNUMBER] = "1",
};
static const USBDescIface desc_iface_wacom = {
.bInterfaceNumber = 0,
.bNumEndpoints = 1,
.bInterfaceClass = USB_CLASS_HID,
.bInterfaceSubClass = 0x01, /* boot */
.bInterfaceProtocol = 0x02,
.ndesc = 1,
.descs = (USBDescOther[]) {
{
/* HID descriptor */
.data = (uint8_t[]) {
0x09, /* u8 bLength */
USB_DT_HID, /* u8 bDescriptorType */
0x01, 0x10, /* u16 HID_class */
0x00, /* u8 country_code */
0x01, /* u8 num_descriptors */
USB_DT_REPORT, /* u8 type: Report */
0x6e, 0, /* u16 len */
},
},
},
.eps = (USBDescEndpoint[]) {
{
.bEndpointAddress = USB_DIR_IN | 0x01,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = 8,
.bInterval = 0x0a,
},
},
};
static const USBDescDevice desc_device_wacom = {
.bcdUSB = 0x0110,
.bMaxPacketSize0 = 8,
.bNumConfigurations = 1,
.confs = (USBDescConfig[]) {
{
.bNumInterfaces = 1,
.bConfigurationValue = 1,
.bmAttributes = USB_CFG_ATT_ONE,
.bMaxPower = 40,
.nif = 1,
.ifs = &desc_iface_wacom,
},
},
};
static const USBDesc desc_wacom = {
.id = {
.idVendor = 0x056a,
.idProduct = 0x0000,
.bcdDevice = 0x4210,
.iManufacturer = STR_MANUFACTURER,
.iProduct = STR_PRODUCT,
.iSerialNumber = STR_SERIALNUMBER,
},
.full = &desc_device_wacom,
.str = desc_strings,
};
static void usb_mouse_event(void *opaque,
int dx1, int dy1, int dz1, int buttons_state)
{
USBWacomState *s = opaque;
s->dx += dx1;
s->dy += dy1;
s->dz += dz1;
s->buttons_state = buttons_state;
s->changed = 1;
usb_wakeup(s->intr, 0);
}
static void usb_wacom_event(void *opaque,
int x, int y, int dz, int buttons_state)
{
USBWacomState *s = opaque;
/* scale to Penpartner resolution */
s->x = (x * 5040 / 0x7FFF);
s->y = (y * 3780 / 0x7FFF);
s->dz += dz;
s->buttons_state = buttons_state;
s->changed = 1;
usb_wakeup(s->intr, 0);
}
static inline int int_clamp(int val, int vmin, int vmax)
{
if (val < vmin)
return vmin;
else if (val > vmax)
return vmax;
else
return val;
}
static int usb_mouse_poll(USBWacomState *s, uint8_t *buf, int len)
{
int dx, dy, dz, b, l;
if (!s->mouse_grabbed) {
s->eh_entry = qemu_add_mouse_event_handler(usb_mouse_event, s, 0,
"QEMU PenPartner tablet");
qemu_activate_mouse_event_handler(s->eh_entry);
s->mouse_grabbed = 1;
}
dx = int_clamp(s->dx, -128, 127);
dy = int_clamp(s->dy, -128, 127);
dz = int_clamp(s->dz, -128, 127);
s->dx -= dx;
s->dy -= dy;
s->dz -= dz;
b = 0;
if (s->buttons_state & MOUSE_EVENT_LBUTTON)
b |= 0x01;
if (s->buttons_state & MOUSE_EVENT_RBUTTON)
b |= 0x02;
if (s->buttons_state & MOUSE_EVENT_MBUTTON)
b |= 0x04;
buf[0] = b;
buf[1] = dx;
buf[2] = dy;
l = 3;
if (len >= 4) {
buf[3] = dz;
l = 4;
}
return l;
}
static int usb_wacom_poll(USBWacomState *s, uint8_t *buf, int len)
{
int b;
if (!s->mouse_grabbed) {
s->eh_entry = qemu_add_mouse_event_handler(usb_wacom_event, s, 1,
"QEMU PenPartner tablet");
qemu_activate_mouse_event_handler(s->eh_entry);
s->mouse_grabbed = 1;
}
b = 0;
if (s->buttons_state & MOUSE_EVENT_LBUTTON)
b |= 0x01;
if (s->buttons_state & MOUSE_EVENT_RBUTTON)
b |= 0x40;
if (s->buttons_state & MOUSE_EVENT_MBUTTON)
b |= 0x20; /* eraser */
if (len < 7)
return 0;
buf[0] = s->mode;
buf[5] = 0x00 | (b & 0xf0);
buf[1] = s->x & 0xff;
buf[2] = s->x >> 8;
buf[3] = s->y & 0xff;
buf[4] = s->y >> 8;
if (b & 0x3f) {
buf[6] = 0;
} else {
buf[6] = (unsigned char) -127;
}
return 7;
}
static void usb_wacom_handle_reset(USBDevice *dev)
{
USBWacomState *s = (USBWacomState *) dev;
s->dx = 0;
s->dy = 0;
s->dz = 0;
s->x = 0;
s->y = 0;
s->buttons_state = 0;
s->mode = WACOM_MODE_HID;
}
static void usb_wacom_handle_control(USBDevice *dev, USBPacket *p,
int request, int value, int index, int length, uint8_t *data)
{
USBWacomState *s = (USBWacomState *) dev;
int ret;
ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
if (ret >= 0) {
return;
}
switch (request) {
case WACOM_SET_REPORT:
if (s->mouse_grabbed) {
qemu_remove_mouse_event_handler(s->eh_entry);
s->mouse_grabbed = 0;
}
s->mode = data[0];
break;
case WACOM_GET_REPORT:
data[0] = 0;
data[1] = s->mode;
p->actual_length = 2;
break;
/* USB HID requests */
case HID_GET_REPORT:
if (s->mode == WACOM_MODE_HID)
p->actual_length = usb_mouse_poll(s, data, length);
else if (s->mode == WACOM_MODE_WACOM)
p->actual_length = usb_wacom_poll(s, data, length);
break;
case HID_GET_IDLE:
data[0] = s->idle;
p->actual_length = 1;
break;
case HID_SET_IDLE:
s->idle = (uint8_t) (value >> 8);
break;
default:
p->status = USB_RET_STALL;
break;
}
}
static void usb_wacom_handle_data(USBDevice *dev, USBPacket *p)
{
USBWacomState *s = (USBWacomState *) dev;
g_autofree uint8_t *buf = g_malloc(p->iov.size);
int len = 0;
switch (p->pid) {
case USB_TOKEN_IN:
if (p->ep->nr == 1) {
if (!(s->changed || s->idle)) {
p->status = USB_RET_NAK;
return;
}
s->changed = 0;
if (s->mode == WACOM_MODE_HID)
len = usb_mouse_poll(s, buf, p->iov.size);
else if (s->mode == WACOM_MODE_WACOM)
len = usb_wacom_poll(s, buf, p->iov.size);
usb_packet_copy(p, buf, len);
break;
}
/* Fall through. */
case USB_TOKEN_OUT:
default:
p->status = USB_RET_STALL;
}
}
static void usb_wacom_unrealize(USBDevice *dev)
{
USBWacomState *s = (USBWacomState *) dev;
if (s->mouse_grabbed) {
qemu_remove_mouse_event_handler(s->eh_entry);
s->mouse_grabbed = 0;
}
}
static void usb_wacom_realize(USBDevice *dev, Error **errp)
{
USBWacomState *s = USB_WACOM(dev);
usb_desc_create_serial(dev);
usb_desc_init(dev);
s->intr = usb_ep_get(dev, USB_TOKEN_IN, 1);
s->changed = 1;
}
static const VMStateDescription vmstate_usb_wacom = {
.name = "usb-wacom",
.unmigratable = 1,
};
static void usb_wacom_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
uc->product_desc = "QEMU PenPartner Tablet";
uc->usb_desc = &desc_wacom;
uc->realize = usb_wacom_realize;
uc->handle_reset = usb_wacom_handle_reset;
uc->handle_control = usb_wacom_handle_control;
uc->handle_data = usb_wacom_handle_data;
uc->unrealize = usb_wacom_unrealize;
set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
dc->desc = "QEMU PenPartner Tablet";
dc->vmsd = &vmstate_usb_wacom;
}
static const TypeInfo wacom_info = {
.name = TYPE_USB_WACOM,
.parent = TYPE_USB_DEVICE,
.instance_size = sizeof(USBWacomState),
.class_init = usb_wacom_class_init,
};
static void usb_wacom_register_types(void)
{
type_register_static(&wacom_info);
usb_legacy_register(TYPE_USB_WACOM, "wacom-tablet", NULL);
}
type_init(usb_wacom_register_types)
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