hw/usb-desc.c

   1 #include "usb.h"
   2 #include "usb-desc.h"
   3 #include "trace.h"
   4
   5 /* ------------------------------------------------------------------ */
   6
   7 static uint8_t usb_lo(uint16_t val)
   8 {
   9     return val & 0xff;
  10 }
  11
  12 static uint8_t usb_hi(uint16_t val)
  13 {
  14     return (val >> 8) & 0xff;
  15 }
  16
  17 int usb_desc_device(const USBDescID *id, const USBDescDevice *dev,
  18                     uint8_t *dest, size_t len)
  19 {
  20     uint8_t bLength = 0x12;
  21
  22     if (len < bLength) {
  23         return -1;
  24     }
  25
  26     dest[0x00] = bLength;
  27     dest[0x01] = USB_DT_DEVICE;
  28
  29     dest[0x02] = usb_lo(dev->bcdUSB);
  30     dest[0x03] = usb_hi(dev->bcdUSB);
  31     dest[0x04] = dev->bDeviceClass;
  32     dest[0x05] = dev->bDeviceSubClass;
  33     dest[0x06] = dev->bDeviceProtocol;
  34     dest[0x07] = dev->bMaxPacketSize0;
  35
  36     dest[0x08] = usb_lo(id->idVendor);
  37     dest[0x09] = usb_hi(id->idVendor);
  38     dest[0x0a] = usb_lo(id->idProduct);
  39     dest[0x0b] = usb_hi(id->idProduct);
  40     dest[0x0c] = usb_lo(id->bcdDevice);
  41     dest[0x0d] = usb_hi(id->bcdDevice);
  42     dest[0x0e] = id->iManufacturer;
  43     dest[0x0f] = id->iProduct;
  44     dest[0x10] = id->iSerialNumber;
  45
  46     dest[0x11] = dev->bNumConfigurations;
  47
  48     return bLength;
  49 }
  50
  51 int usb_desc_device_qualifier(const USBDescDevice *dev,
  52                               uint8_t *dest, size_t len)
  53 {
  54     uint8_t bLength = 0x0a;
  55
  56     if (len < bLength) {
  57         return -1;
  58     }
  59
  60     dest[0x00] = bLength;
  61     dest[0x01] = USB_DT_DEVICE_QUALIFIER;
  62
  63     dest[0x02] = usb_lo(dev->bcdUSB);
  64     dest[0x03] = usb_hi(dev->bcdUSB);
  65     dest[0x04] = dev->bDeviceClass;
  66     dest[0x05] = dev->bDeviceSubClass;
  67     dest[0x06] = dev->bDeviceProtocol;
  68     dest[0x07] = dev->bMaxPacketSize0;
  69     dest[0x08] = dev->bNumConfigurations;
  70     dest[0x09] = 0; /* reserved */
  71
  72     return bLength;
  73 }
  74
  75 int usb_desc_config(const USBDescConfig *conf, uint8_t *dest, size_t len)
  76 {
  77     uint8_t  bLength = 0x09;
  78     uint16_t wTotalLength = 0;
  79     int i, rc;
  80
  81     if (len < bLength) {
  82         return -1;
  83     }
  84
  85     dest[0x00] = bLength;
  86     dest[0x01] = USB_DT_CONFIG;
  87     dest[0x04] = conf->bNumInterfaces;
  88     dest[0x05] = conf->bConfigurationValue;
  89     dest[0x06] = conf->iConfiguration;
  90     dest[0x07] = conf->bmAttributes;
  91     dest[0x08] = conf->bMaxPower;
  92     wTotalLength += bLength;
  93
  94     /* handle grouped interfaces if any*/
  95     for (i = 0; i < conf->nif_groups; i++) {
  96         rc = usb_desc_iface_group(&(conf->if_groups[i]),
  97                                   dest + wTotalLength,
  98                                   len - wTotalLength);
  99         if (rc < 0) {
 100             return rc;
 101         }
 102         wTotalLength += rc;
 103     }
 104
 105     /* handle normal (ungrouped / no IAD) interfaces if any */
 106     for (i = 0; i < conf->nif; i++) {
 107         rc = usb_desc_iface(conf->ifs + i, dest + wTotalLength, len - wTotalLength);
 108         if (rc < 0) {
 109             return rc;
 110         }
 111         wTotalLength += rc;
 112     }
 113
 114     dest[0x02] = usb_lo(wTotalLength);
 115     dest[0x03] = usb_hi(wTotalLength);
 116     return wTotalLength;
 117 }
 118
 119 int usb_desc_iface_group(const USBDescIfaceAssoc *iad, uint8_t *dest,
 120                          size_t len)
 121 {
 122     int pos = 0;
 123     int i = 0;
 124
 125     /* handle interface association descriptor */
 126     uint8_t bLength = 0x08;
 127
 128     if (len < bLength) {
 129         return -1;
 130     }
 131
 132     dest[0x00] = bLength;
 133     dest[0x01] = USB_DT_INTERFACE_ASSOC;
 134     dest[0x02] = iad->bFirstInterface;
 135     dest[0x03] = iad->bInterfaceCount;
 136     dest[0x04] = iad->bFunctionClass;
 137     dest[0x05] = iad->bFunctionSubClass;
 138     dest[0x06] = iad->bFunctionProtocol;
 139     dest[0x07] = iad->iFunction;
 140     pos += bLength;
 141
 142     /* handle associated interfaces in this group */
 143     for (i = 0; i < iad->nif; i++) {
 144         int rc = usb_desc_iface(&(iad->ifs[i]), dest + pos, len - pos);
 145         if (rc < 0) {
 146             return rc;
 147         }
 148         pos += rc;
 149     }
 150
 151     return pos;
 152 }
 153
 154 int usb_desc_iface(const USBDescIface *iface, uint8_t *dest, size_t len)
 155 {
 156     uint8_t bLength = 0x09;
 157     int i, rc, pos = 0;
 158
 159     if (len < bLength) {
 160         return -1;
 161     }
 162
 163     dest[0x00] = bLength;
 164     dest[0x01] = USB_DT_INTERFACE;
 165     dest[0x02] = iface->bInterfaceNumber;
 166     dest[0x03] = iface->bAlternateSetting;
 167     dest[0x04] = iface->bNumEndpoints;
 168     dest[0x05] = iface->bInterfaceClass;
 169     dest[0x06] = iface->bInterfaceSubClass;
 170     dest[0x07] = iface->bInterfaceProtocol;
 171     dest[0x08] = iface->iInterface;
 172     pos += bLength;
 173
 174     for (i = 0; i < iface->ndesc; i++) {
 175         rc = usb_desc_other(iface->descs + i, dest + pos, len - pos);
 176         if (rc < 0) {
 177             return rc;
 178         }
 179         pos += rc;
 180     }
 181
 182     for (i = 0; i < iface->bNumEndpoints; i++) {
 183         rc = usb_desc_endpoint(iface->eps + i, dest + pos, len - pos);
 184         if (rc < 0) {
 185             return rc;
 186         }
 187         pos += rc;
 188     }
 189
 190     return pos;
 191 }
 192
 193 int usb_desc_endpoint(const USBDescEndpoint *ep, uint8_t *dest, size_t len)
 194 {
 195     uint8_t bLength = 0x07;
 196
 197     if (len < bLength) {
 198         return -1;
 199     }
 200
 201     dest[0x00] = bLength;
 202     dest[0x01] = USB_DT_ENDPOINT;
 203     dest[0x02] = ep->bEndpointAddress;
 204     dest[0x03] = ep->bmAttributes;
 205     dest[0x04] = usb_lo(ep->wMaxPacketSize);
 206     dest[0x05] = usb_hi(ep->wMaxPacketSize);
 207     dest[0x06] = ep->bInterval;
 208
 209     return bLength;
 210 }
 211
 212 int usb_desc_other(const USBDescOther *desc, uint8_t *dest, size_t len)
 213 {
 214     int bLength = desc->length ? desc->length : desc->data[0];
 215
 216     if (len < bLength) {
 217         return -1;
 218     }
 219
 220     memcpy(dest, desc->data, bLength);
 221     return bLength;
 222 }
 223
 224 /* ------------------------------------------------------------------ */
 225
 226 static void usb_desc_setdefaults(USBDevice *dev)
 227 {
 228     const USBDesc *desc = dev->info->usb_desc;
 229
 230     assert(desc != NULL);
 231     switch (dev->speed) {
 232     case USB_SPEED_LOW:
 233     case USB_SPEED_FULL:
 234         dev->device = desc->full;
 235         break;
 236     case USB_SPEED_HIGH:
 237         dev->device = desc->high;
 238         break;
 239     }
 240     dev->config = dev->device->confs;
 241 }
 242
 243 void usb_desc_init(USBDevice *dev)
 244 {
 245     const USBDesc *desc = dev->info->usb_desc;
 246
 247     assert(desc != NULL);
 248     dev->speed = USB_SPEED_FULL;
 249     dev->speedmask = 0;
 250     if (desc->full) {
 251         dev->speedmask |= USB_SPEED_MASK_FULL;
 252     }
 253     if (desc->high) {
 254         dev->speedmask |= USB_SPEED_MASK_HIGH;
 255     }
 256     usb_desc_setdefaults(dev);
 257 }
 258
 259 void usb_desc_attach(USBDevice *dev)
 260 {
 261     const USBDesc *desc = dev->info->usb_desc;
 262
 263     assert(desc != NULL);
 264     if (desc->high && (dev->port->speedmask & USB_SPEED_MASK_HIGH)) {
 265         dev->speed = USB_SPEED_HIGH;
 266     } else if (desc->full && (dev->port->speedmask & USB_SPEED_MASK_FULL)) {
 267         dev->speed = USB_SPEED_FULL;
 268     } else {
 269         fprintf(stderr, "usb: port/device speed mismatch for \"%s\"\n",
 270                 dev->info->product_desc);
 271         return;
 272     }
 273     usb_desc_setdefaults(dev);
 274 }
 275
 276 void usb_desc_set_string(USBDevice *dev, uint8_t index, const char *str)
 277 {
 278     USBDescString *s;
 279
 280     QLIST_FOREACH(s, &dev->strings, next) {
 281         if (s->index == index) {
 282             break;
 283         }
 284     }
 285     if (s == NULL) {
 286         s = g_malloc0(sizeof(*s));
 287         s->index = index;
 288         QLIST_INSERT_HEAD(&dev->strings, s, next);
 289     }
 290     g_free(s->str);
 291     s->str = g_strdup(str);
 292 }
 293
 294 const char *usb_desc_get_string(USBDevice *dev, uint8_t index)
 295 {
 296     USBDescString *s;
 297
 298     QLIST_FOREACH(s, &dev->strings, next) {
 299         if (s->index == index) {
 300             return s->str;
 301         }
 302     }
 303     return NULL;
 304 }
 305
 306 int usb_desc_string(USBDevice *dev, int index, uint8_t *dest, size_t len)
 307 {
 308     uint8_t bLength, pos, i;
 309     const char *str;
 310
 311     if (len < 4) {
 312         return -1;
 313     }
 314
 315     if (index == 0) {
 316         /* language ids */
 317         dest[0] = 4;
 318         dest[1] = USB_DT_STRING;
 319         dest[2] = 0x09;
 320         dest[3] = 0x04;
 321         return 4;
 322     }
 323
 324     str = usb_desc_get_string(dev, index);
 325     if (str == NULL) {
 326         str = dev->info->usb_desc->str[index];
 327         if (str == NULL) {
 328             return 0;
 329         }
 330     }
 331
 332     bLength = strlen(str) * 2 + 2;
 333     dest[0] = bLength;
 334     dest[1] = USB_DT_STRING;
 335     i = 0; pos = 2;
 336     while (pos+1 < bLength && pos+1 < len) {
 337         dest[pos++] = str[i++];
 338         dest[pos++] = 0;
 339     }
 340     return pos;
 341 }
 342
 343 int usb_desc_get_descriptor(USBDevice *dev, int value, uint8_t *dest, size_t len)
 344 {
 345     const USBDesc *desc = dev->info->usb_desc;
 346     const USBDescDevice *other_dev;
 347     uint8_t buf[256];
 348     uint8_t type = value >> 8;
 349     uint8_t index = value & 0xff;
 350     int ret = -1;
 351
 352     if (dev->speed == USB_SPEED_HIGH) {
 353         other_dev = dev->info->usb_desc->full;
 354     } else {
 355         other_dev = dev->info->usb_desc->high;
 356     }
 357
 358     switch(type) {
 359     case USB_DT_DEVICE:
 360         ret = usb_desc_device(&desc->id, dev->device, buf, sizeof(buf));
 361         trace_usb_desc_device(dev->addr, len, ret);
 362         break;
 363     case USB_DT_CONFIG:
 364         if (index < dev->device->bNumConfigurations) {
 365             ret = usb_desc_config(dev->device->confs + index, buf, sizeof(buf));
 366         }
 367         trace_usb_desc_config(dev->addr, index, len, ret);
 368         break;
 369     case USB_DT_STRING:
 370         ret = usb_desc_string(dev, index, buf, sizeof(buf));
 371         trace_usb_desc_string(dev->addr, index, len, ret);
 372         break;
 373
 374     case USB_DT_DEVICE_QUALIFIER:
 375         if (other_dev != NULL) {
 376             ret = usb_desc_device_qualifier(other_dev, buf, sizeof(buf));
 377         }
 378         trace_usb_desc_device_qualifier(dev->addr, len, ret);
 379         break;
 380     case USB_DT_OTHER_SPEED_CONFIG:
 381         if (other_dev != NULL && index < other_dev->bNumConfigurations) {
 382             ret = usb_desc_config(other_dev->confs + index, buf, sizeof(buf));
 383             buf[0x01] = USB_DT_OTHER_SPEED_CONFIG;
 384         }
 385         trace_usb_desc_other_speed_config(dev->addr, index, len, ret);
 386         break;
 387
 388     case USB_DT_DEBUG:
 389         /* ignore silently */
 390         break;
 391
 392     default:
 393         fprintf(stderr, "%s: %d unknown type %d (len %zd)\n", __FUNCTION__,
 394                 dev->addr, type, len);
 395         break;
 396     }
 397
 398     if (ret > 0) {
 399         if (ret > len) {
 400             ret = len;
 401         }
 402         memcpy(dest, buf, ret);
 403     }
 404     return ret;
 405 }
 406
 407 int usb_desc_handle_control(USBDevice *dev, USBPacket *p,
 408         int request, int value, int index, int length, uint8_t *data)
 409 {
 410     const USBDesc *desc = dev->info->usb_desc;
 411     int i, ret = -1;
 412
 413     assert(desc != NULL);
 414     switch(request) {
 415     case DeviceOutRequest | USB_REQ_SET_ADDRESS:
 416         dev->addr = value;
 417         trace_usb_set_addr(dev->addr);
 418         ret = 0;
 419         break;
 420
 421     case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
 422         ret = usb_desc_get_descriptor(dev, value, data, length);
 423         break;
 424
 425     case DeviceRequest | USB_REQ_GET_CONFIGURATION:
 426         data[0] = dev->config->bConfigurationValue;
 427         ret = 1;
 428         break;
 429     case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
 430         for (i = 0; i < dev->device->bNumConfigurations; i++) {
 431             if (dev->device->confs[i].bConfigurationValue == value) {
 432                 dev->config = dev->device->confs + i;
 433                 ret = 0;
 434             }
 435         }
 436         trace_usb_set_config(dev->addr, value, ret);
 437         break;
 438
 439     case DeviceRequest | USB_REQ_GET_STATUS:
 440         data[0] = 0;
 441         if (dev->config->bmAttributes & 0x40) {
 442             data[0] |= 1 << USB_DEVICE_SELF_POWERED;
 443         }
 444         if (dev->remote_wakeup) {
 445             data[0] |= 1 << USB_DEVICE_REMOTE_WAKEUP;
 446         }
 447         data[1] = 0x00;
 448         ret = 2;
 449         break;
 450     case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
 451         if (value == USB_DEVICE_REMOTE_WAKEUP) {
 452             dev->remote_wakeup = 0;
 453             ret = 0;
 454         }
 455         trace_usb_clear_device_feature(dev->addr, value, ret);
 456         break;
 457     case DeviceOutRequest | USB_REQ_SET_FEATURE:
 458         if (value == USB_DEVICE_REMOTE_WAKEUP) {
 459             dev->remote_wakeup = 1;
 460             ret = 0;
 461         }
 462         trace_usb_set_device_feature(dev->addr, value, ret);
 463         break;
 464     }
 465     return ret;
 466 }