hw/usb/dev-wacom.c

   1 /*
   2  * Wacom PenPartner USB tablet emulation.
   3  *
   4  * Copyright (c) 2006 Openedhand Ltd.
   5  * Author: Andrzej Zaborowski <balrog@zabor.org>
   6  *
   7  * Based on hw/usb-hid.c:
   8  * Copyright (c) 2005 Fabrice Bellard
   9  *
  10  * Permission is hereby granted, free of charge, to any person obtaining a copy
  11  * of this software and associated documentation files (the "Software"), to deal
  12  * in the Software without restriction, including without limitation the rights
  13  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  14  * copies of the Software, and to permit persons to whom the Software is
  15  * furnished to do so, subject to the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be included in
  18  * all copies or substantial portions of the Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  23  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  24  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  25  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  26  * THE SOFTWARE.
  27  */
  28 #include "hw/hw.h"
  29 #include "ui/console.h"
  30 #include "hw/usb.h"
  31 #include "hw/usb/desc.h"
  32
  33 /* Interface requests */
  34 #define WACOM_GET_REPORT        0x2101
  35 #define WACOM_SET_REPORT        0x2109
  36
  37 /* HID interface requests */
  38 #define HID_GET_REPORT          0xa101
  39 #define HID_GET_IDLE            0xa102
  40 #define HID_GET_PROTOCOL        0xa103
  41 #define HID_SET_IDLE            0x210a
  42 #define HID_SET_PROTOCOL        0x210b
  43
  44 typedef struct USBWacomState {
  45     USBDevice dev;
  46     USBEndpoint *intr;
  47     QEMUPutMouseEntry *eh_entry;
  48     int dx, dy, dz, buttons_state;
  49     int x, y;
  50     int mouse_grabbed;
  51     enum {
  52         WACOM_MODE_HID = 1,
  53         WACOM_MODE_WACOM = 2,
  54     } mode;
  55     uint8_t idle;
  56     int changed;
  57 } USBWacomState;
  58
  59 enum {
  60     STR_MANUFACTURER = 1,
  61     STR_PRODUCT,
  62     STR_SERIALNUMBER,
  63 };
  64
  65 static const USBDescStrings desc_strings = {
  66     [STR_MANUFACTURER]     = "QEMU",
  67     [STR_PRODUCT]          = "Wacom PenPartner",
  68     [STR_SERIALNUMBER]     = "1",
  69 };
  70
  71 static const USBDescIface desc_iface_wacom = {
  72     .bInterfaceNumber              = 0,
  73     .bNumEndpoints                 = 1,
  74     .bInterfaceClass               = USB_CLASS_HID,
  75     .bInterfaceSubClass            = 0x01, /* boot */
  76     .bInterfaceProtocol            = 0x02,
  77     .ndesc                         = 1,
  78     .descs = (USBDescOther[]) {
  79         {
  80             /* HID descriptor */
  81             .data = (uint8_t[]) {
  82                 0x09,          /*  u8  bLength */
  83                 0x21,          /*  u8  bDescriptorType */
  84                 0x01, 0x10,    /*  u16 HID_class */
  85                 0x00,          /*  u8  country_code */
  86                 0x01,          /*  u8  num_descriptors */
  87                 0x22,          /*  u8  type: Report */
  88                 0x6e, 0,       /*  u16 len */
  89             },
  90         },
  91     },
  92     .eps = (USBDescEndpoint[]) {
  93         {
  94             .bEndpointAddress      = USB_DIR_IN | 0x01,
  95             .bmAttributes          = USB_ENDPOINT_XFER_INT,
  96             .wMaxPacketSize        = 8,
  97             .bInterval             = 0x0a,
  98         },
  99     },
 100 };
 101
 102 static const USBDescDevice desc_device_wacom = {
 103     .bcdUSB                        = 0x0110,
 104     .bMaxPacketSize0               = 8,
 105     .bNumConfigurations            = 1,
 106     .confs = (USBDescConfig[]) {
 107         {
 108             .bNumInterfaces        = 1,
 109             .bConfigurationValue   = 1,
 110             .bmAttributes          = USB_CFG_ATT_ONE,
 111             .bMaxPower             = 40,
 112             .nif = 1,
 113             .ifs = &desc_iface_wacom,
 114         },
 115     },
 116 };
 117
 118 static const USBDesc desc_wacom = {
 119     .id = {
 120         .idVendor          = 0x056a,
 121         .idProduct         = 0x0000,
 122         .bcdDevice         = 0x4210,
 123         .iManufacturer     = STR_MANUFACTURER,
 124         .iProduct          = STR_PRODUCT,
 125         .iSerialNumber     = STR_SERIALNUMBER,
 126     },
 127     .full = &desc_device_wacom,
 128     .str  = desc_strings,
 129 };
 130
 131 static void usb_mouse_event(void *opaque,
 132                             int dx1, int dy1, int dz1, int buttons_state)
 133 {
 134     USBWacomState *s = opaque;
 135
 136     s->dx += dx1;
 137     s->dy += dy1;
 138     s->dz += dz1;
 139     s->buttons_state = buttons_state;
 140     s->changed = 1;
 141     usb_wakeup(s->intr, 0);
 142 }
 143
 144 static void usb_wacom_event(void *opaque,
 145                             int x, int y, int dz, int buttons_state)
 146 {
 147     USBWacomState *s = opaque;
 148
 149     /* scale to Penpartner resolution */
 150     s->x = (x * 5040 / 0x7FFF);
 151     s->y = (y * 3780 / 0x7FFF);
 152     s->dz += dz;
 153     s->buttons_state = buttons_state;
 154     s->changed = 1;
 155     usb_wakeup(s->intr, 0);
 156 }
 157
 158 static inline int int_clamp(int val, int vmin, int vmax)
 159 {
 160     if (val < vmin)
 161         return vmin;
 162     else if (val > vmax)
 163         return vmax;
 164     else
 165         return val;
 166 }
 167
 168 static int usb_mouse_poll(USBWacomState *s, uint8_t *buf, int len)
 169 {
 170     int dx, dy, dz, b, l;
 171
 172     if (!s->mouse_grabbed) {
 173         s->eh_entry = qemu_add_mouse_event_handler(usb_mouse_event, s, 0,
 174                         "QEMU PenPartner tablet");
 175         qemu_activate_mouse_event_handler(s->eh_entry);
 176         s->mouse_grabbed = 1;
 177     }
 178
 179     dx = int_clamp(s->dx, -128, 127);
 180     dy = int_clamp(s->dy, -128, 127);
 181     dz = int_clamp(s->dz, -128, 127);
 182
 183     s->dx -= dx;
 184     s->dy -= dy;
 185     s->dz -= dz;
 186
 187     b = 0;
 188     if (s->buttons_state & MOUSE_EVENT_LBUTTON)
 189         b |= 0x01;
 190     if (s->buttons_state & MOUSE_EVENT_RBUTTON)
 191         b |= 0x02;
 192     if (s->buttons_state & MOUSE_EVENT_MBUTTON)
 193         b |= 0x04;
 194
 195     buf[0] = b;
 196     buf[1] = dx;
 197     buf[2] = dy;
 198     l = 3;
 199     if (len >= 4) {
 200         buf[3] = dz;
 201         l = 4;
 202     }
 203     return l;
 204 }
 205
 206 static int usb_wacom_poll(USBWacomState *s, uint8_t *buf, int len)
 207 {
 208     int b;
 209
 210     if (!s->mouse_grabbed) {
 211         s->eh_entry = qemu_add_mouse_event_handler(usb_wacom_event, s, 1,
 212                         "QEMU PenPartner tablet");
 213         qemu_activate_mouse_event_handler(s->eh_entry);
 214         s->mouse_grabbed = 1;
 215     }
 216
 217     b = 0;
 218     if (s->buttons_state & MOUSE_EVENT_LBUTTON)
 219         b |= 0x01;
 220     if (s->buttons_state & MOUSE_EVENT_RBUTTON)
 221         b |= 0x40;
 222     if (s->buttons_state & MOUSE_EVENT_MBUTTON)
 223         b |= 0x20; /* eraser */
 224
 225     if (len < 7)
 226         return 0;
 227
 228     buf[0] = s->mode;
 229     buf[5] = 0x00 | (b & 0xf0);
 230     buf[1] = s->x & 0xff;
 231     buf[2] = s->x >> 8;
 232     buf[3] = s->y & 0xff;
 233     buf[4] = s->y >> 8;
 234     if (b & 0x3f) {
 235         buf[6] = 0;
 236     } else {
 237         buf[6] = (unsigned char) -127;
 238     }
 239
 240     return 7;
 241 }
 242
 243 static void usb_wacom_handle_reset(USBDevice *dev)
 244 {
 245     USBWacomState *s = (USBWacomState *) dev;
 246
 247     s->dx = 0;
 248     s->dy = 0;
 249     s->dz = 0;
 250     s->x = 0;
 251     s->y = 0;
 252     s->buttons_state = 0;
 253     s->mode = WACOM_MODE_HID;
 254 }
 255
 256 static void usb_wacom_handle_control(USBDevice *dev, USBPacket *p,
 257                int request, int value, int index, int length, uint8_t *data)
 258 {
 259     USBWacomState *s = (USBWacomState *) dev;
 260     int ret;
 261
 262     ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
 263     if (ret >= 0) {
 264         return;
 265     }
 266
 267     switch (request) {
 268     case WACOM_SET_REPORT:
 269         if (s->mouse_grabbed) {
 270             qemu_remove_mouse_event_handler(s->eh_entry);
 271             s->mouse_grabbed = 0;
 272         }
 273         s->mode = data[0];
 274         break;
 275     case WACOM_GET_REPORT:
 276         data[0] = 0;
 277         data[1] = s->mode;
 278         p->actual_length = 2;
 279         break;
 280     /* USB HID requests */
 281     case HID_GET_REPORT:
 282         if (s->mode == WACOM_MODE_HID)
 283             p->actual_length = usb_mouse_poll(s, data, length);
 284         else if (s->mode == WACOM_MODE_WACOM)
 285             p->actual_length = usb_wacom_poll(s, data, length);
 286         break;
 287     case HID_GET_IDLE:
 288         data[0] = s->idle;
 289         p->actual_length = 1;
 290         break;
 291     case HID_SET_IDLE:
 292         s->idle = (uint8_t) (value >> 8);
 293         break;
 294     default:
 295         p->status = USB_RET_STALL;
 296         break;
 297     }
 298 }
 299
 300 static void usb_wacom_handle_data(USBDevice *dev, USBPacket *p)
 301 {
 302     USBWacomState *s = (USBWacomState *) dev;
 303     uint8_t buf[p->iov.size];
 304     int len = 0;
 305
 306     switch (p->pid) {
 307     case USB_TOKEN_IN:
 308         if (p->ep->nr == 1) {
 309             if (!(s->changed || s->idle)) {
 310                 p->status = USB_RET_NAK;
 311                 return;
 312             }
 313             s->changed = 0;
 314             if (s->mode == WACOM_MODE_HID)
 315                 len = usb_mouse_poll(s, buf, p->iov.size);
 316             else if (s->mode == WACOM_MODE_WACOM)
 317                 len = usb_wacom_poll(s, buf, p->iov.size);
 318             usb_packet_copy(p, buf, len);
 319             break;
 320         }
 321         /* Fall through.  */
 322     case USB_TOKEN_OUT:
 323     default:
 324         p->status = USB_RET_STALL;
 325     }
 326 }
 327
 328 static void usb_wacom_handle_destroy(USBDevice *dev)
 329 {
 330     USBWacomState *s = (USBWacomState *) dev;
 331
 332     if (s->mouse_grabbed) {
 333         qemu_remove_mouse_event_handler(s->eh_entry);
 334         s->mouse_grabbed = 0;
 335     }
 336 }
 337
 338 static void usb_wacom_realize(USBDevice *dev, Error **errp)
 339 {
 340     USBWacomState *s = DO_UPCAST(USBWacomState, dev, dev);
 341     usb_desc_create_serial(dev);
 342     usb_desc_init(dev);
 343     s->intr = usb_ep_get(dev, USB_TOKEN_IN, 1);
 344     s->changed = 1;
 345 }
 346
 347 static const VMStateDescription vmstate_usb_wacom = {
 348     .name = "usb-wacom",
 349     .unmigratable = 1,
 350 };
 351
 352 static void usb_wacom_class_init(ObjectClass *klass, void *data)
 353 {
 354     DeviceClass *dc = DEVICE_CLASS(klass);
 355     USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
 356
 357     uc->product_desc   = "QEMU PenPartner Tablet";
 358     uc->usb_desc       = &desc_wacom;
 359     uc->realize        = usb_wacom_realize;
 360     uc->handle_reset   = usb_wacom_handle_reset;
 361     uc->handle_control = usb_wacom_handle_control;
 362     uc->handle_data    = usb_wacom_handle_data;
 363     uc->handle_destroy = usb_wacom_handle_destroy;
 364     set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
 365     dc->desc = "QEMU PenPartner Tablet";
 366     dc->vmsd = &vmstate_usb_wacom;
 367 }
 368
 369 static const TypeInfo wacom_info = {
 370     .name          = "usb-wacom-tablet",
 371     .parent        = TYPE_USB_DEVICE,
 372     .instance_size = sizeof(USBWacomState),
 373     .class_init    = usb_wacom_class_init,
 374 };
 375
 376 static void usb_wacom_register_types(void)
 377 {
 378     type_register_static(&wacom_info);
 379     usb_legacy_register("usb-wacom-tablet", "wacom-tablet", NULL);
 380 }
 381
 382 type_init(usb_wacom_register_types)