hw/usb/dev-hub.c

   1 /*
   2  * QEMU USB HUB emulation
   3  *
   4  * Copyright (c) 2005 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "qemu-common.h"
  25 #include "trace.h"
  26 #include "hw/usb.h"
  27 #include "hw/usb/desc.h"
  28
  29 #define NUM_PORTS 8
  30
  31 typedef struct USBHubPort {
  32     USBPort port;
  33     uint16_t wPortStatus;
  34     uint16_t wPortChange;
  35 } USBHubPort;
  36
  37 typedef struct USBHubState {
  38     USBDevice dev;
  39     USBEndpoint *intr;
  40     USBHubPort ports[NUM_PORTS];
  41 } USBHubState;
  42
  43 #define ClearHubFeature         (0x2000 | USB_REQ_CLEAR_FEATURE)
  44 #define ClearPortFeature        (0x2300 | USB_REQ_CLEAR_FEATURE)
  45 #define GetHubDescriptor        (0xa000 | USB_REQ_GET_DESCRIPTOR)
  46 #define GetHubStatus            (0xa000 | USB_REQ_GET_STATUS)
  47 #define GetPortStatus           (0xa300 | USB_REQ_GET_STATUS)
  48 #define SetHubFeature           (0x2000 | USB_REQ_SET_FEATURE)
  49 #define SetPortFeature          (0x2300 | USB_REQ_SET_FEATURE)
  50
  51 #define PORT_STAT_CONNECTION    0x0001
  52 #define PORT_STAT_ENABLE        0x0002
  53 #define PORT_STAT_SUSPEND       0x0004
  54 #define PORT_STAT_OVERCURRENT   0x0008
  55 #define PORT_STAT_RESET         0x0010
  56 #define PORT_STAT_POWER         0x0100
  57 #define PORT_STAT_LOW_SPEED     0x0200
  58 #define PORT_STAT_HIGH_SPEED    0x0400
  59 #define PORT_STAT_TEST          0x0800
  60 #define PORT_STAT_INDICATOR     0x1000
  61
  62 #define PORT_STAT_C_CONNECTION  0x0001
  63 #define PORT_STAT_C_ENABLE      0x0002
  64 #define PORT_STAT_C_SUSPEND     0x0004
  65 #define PORT_STAT_C_OVERCURRENT 0x0008
  66 #define PORT_STAT_C_RESET       0x0010
  67
  68 #define PORT_CONNECTION         0
  69 #define PORT_ENABLE             1
  70 #define PORT_SUSPEND            2
  71 #define PORT_OVERCURRENT        3
  72 #define PORT_RESET              4
  73 #define PORT_POWER              8
  74 #define PORT_LOWSPEED           9
  75 #define PORT_HIGHSPEED          10
  76 #define PORT_C_CONNECTION       16
  77 #define PORT_C_ENABLE           17
  78 #define PORT_C_SUSPEND          18
  79 #define PORT_C_OVERCURRENT      19
  80 #define PORT_C_RESET            20
  81 #define PORT_TEST               21
  82 #define PORT_INDICATOR          22
  83
  84 /* same as Linux kernel root hubs */
  85
  86 enum {
  87     STR_MANUFACTURER = 1,
  88     STR_PRODUCT,
  89     STR_SERIALNUMBER,
  90 };
  91
  92 static const USBDescStrings desc_strings = {
  93     [STR_MANUFACTURER] = "QEMU",
  94     [STR_PRODUCT]      = "QEMU USB Hub",
  95     [STR_SERIALNUMBER] = "314159",
  96 };
  97
  98 static const USBDescIface desc_iface_hub = {
  99     .bInterfaceNumber              = 0,
 100     .bNumEndpoints                 = 1,
 101     .bInterfaceClass               = USB_CLASS_HUB,
 102     .eps = (USBDescEndpoint[]) {
 103         {
 104             .bEndpointAddress      = USB_DIR_IN | 0x01,
 105             .bmAttributes          = USB_ENDPOINT_XFER_INT,
 106             .wMaxPacketSize        = 1 + (NUM_PORTS + 7) / 8,
 107             .bInterval             = 0xff,
 108         },
 109     }
 110 };
 111
 112 static const USBDescDevice desc_device_hub = {
 113     .bcdUSB                        = 0x0110,
 114     .bDeviceClass                  = USB_CLASS_HUB,
 115     .bMaxPacketSize0               = 8,
 116     .bNumConfigurations            = 1,
 117     .confs = (USBDescConfig[]) {
 118         {
 119             .bNumInterfaces        = 1,
 120             .bConfigurationValue   = 1,
 121             .bmAttributes          = 0xe0,
 122             .nif = 1,
 123             .ifs = &desc_iface_hub,
 124         },
 125     },
 126 };
 127
 128 static const USBDesc desc_hub = {
 129     .id = {
 130         .idVendor          = 0x0409,
 131         .idProduct         = 0x55aa,
 132         .bcdDevice         = 0x0101,
 133         .iManufacturer     = STR_MANUFACTURER,
 134         .iProduct          = STR_PRODUCT,
 135         .iSerialNumber     = STR_SERIALNUMBER,
 136     },
 137     .full = &desc_device_hub,
 138     .str  = desc_strings,
 139 };
 140
 141 static const uint8_t qemu_hub_hub_descriptor[] =
 142 {
 143         0x00,                   /*  u8  bLength; patched in later */
 144         0x29,                   /*  u8  bDescriptorType; Hub-descriptor */
 145         0x00,                   /*  u8  bNbrPorts; (patched later) */
 146         0x0a,                   /* u16  wHubCharacteristics; */
 147         0x00,                   /*   (per-port OC, no power switching) */
 148         0x01,                   /*  u8  bPwrOn2pwrGood; 2ms */
 149         0x00                    /*  u8  bHubContrCurrent; 0 mA */
 150
 151         /* DeviceRemovable and PortPwrCtrlMask patched in later */
 152 };
 153
 154 static void usb_hub_attach(USBPort *port1)
 155 {
 156     USBHubState *s = port1->opaque;
 157     USBHubPort *port = &s->ports[port1->index];
 158
 159     trace_usb_hub_attach(s->dev.addr, port1->index + 1);
 160     port->wPortStatus |= PORT_STAT_CONNECTION;
 161     port->wPortChange |= PORT_STAT_C_CONNECTION;
 162     if (port->port.dev->speed == USB_SPEED_LOW) {
 163         port->wPortStatus |= PORT_STAT_LOW_SPEED;
 164     } else {
 165         port->wPortStatus &= ~PORT_STAT_LOW_SPEED;
 166     }
 167     usb_wakeup(s->intr);
 168 }
 169
 170 static void usb_hub_detach(USBPort *port1)
 171 {
 172     USBHubState *s = port1->opaque;
 173     USBHubPort *port = &s->ports[port1->index];
 174
 175     trace_usb_hub_detach(s->dev.addr, port1->index + 1);
 176     usb_wakeup(s->intr);
 177
 178     /* Let upstream know the device on this port is gone */
 179     s->dev.port->ops->child_detach(s->dev.port, port1->dev);
 180
 181     port->wPortStatus &= ~PORT_STAT_CONNECTION;
 182     port->wPortChange |= PORT_STAT_C_CONNECTION;
 183     if (port->wPortStatus & PORT_STAT_ENABLE) {
 184         port->wPortStatus &= ~PORT_STAT_ENABLE;
 185         port->wPortChange |= PORT_STAT_C_ENABLE;
 186     }
 187 }
 188
 189 static void usb_hub_child_detach(USBPort *port1, USBDevice *child)
 190 {
 191     USBHubState *s = port1->opaque;
 192
 193     /* Pass along upstream */
 194     s->dev.port->ops->child_detach(s->dev.port, child);
 195 }
 196
 197 static void usb_hub_wakeup(USBPort *port1)
 198 {
 199     USBHubState *s = port1->opaque;
 200     USBHubPort *port = &s->ports[port1->index];
 201
 202     if (port->wPortStatus & PORT_STAT_SUSPEND) {
 203         port->wPortChange |= PORT_STAT_C_SUSPEND;
 204         usb_wakeup(s->intr);
 205     }
 206 }
 207
 208 static void usb_hub_complete(USBPort *port, USBPacket *packet)
 209 {
 210     USBHubState *s = port->opaque;
 211
 212     /*
 213      * Just pass it along upstream for now.
 214      *
 215      * If we ever implement usb 2.0 split transactions this will
 216      * become a little more complicated ...
 217      *
 218      * Can't use usb_packet_complete() here because packet->owner is
 219      * cleared already, go call the ->complete() callback directly
 220      * instead.
 221      */
 222     s->dev.port->ops->complete(s->dev.port, packet);
 223 }
 224
 225 static USBDevice *usb_hub_find_device(USBDevice *dev, uint8_t addr)
 226 {
 227     USBHubState *s = DO_UPCAST(USBHubState, dev, dev);
 228     USBHubPort *port;
 229     USBDevice *downstream;
 230     int i;
 231
 232     for (i = 0; i < NUM_PORTS; i++) {
 233         port = &s->ports[i];
 234         if (!(port->wPortStatus & PORT_STAT_ENABLE)) {
 235             continue;
 236         }
 237         downstream = usb_find_device(&port->port, addr);
 238         if (downstream != NULL) {
 239             return downstream;
 240         }
 241     }
 242     return NULL;
 243 }
 244
 245 static void usb_hub_handle_reset(USBDevice *dev)
 246 {
 247     USBHubState *s = DO_UPCAST(USBHubState, dev, dev);
 248     USBHubPort *port;
 249     int i;
 250
 251     trace_usb_hub_reset(s->dev.addr);
 252     for (i = 0; i < NUM_PORTS; i++) {
 253         port = s->ports + i;
 254         port->wPortStatus = PORT_STAT_POWER;
 255         port->wPortChange = 0;
 256         if (port->port.dev && port->port.dev->attached) {
 257             port->wPortStatus |= PORT_STAT_CONNECTION;
 258             port->wPortChange |= PORT_STAT_C_CONNECTION;
 259             if (port->port.dev->speed == USB_SPEED_LOW) {
 260                 port->wPortStatus |= PORT_STAT_LOW_SPEED;
 261             }
 262         }
 263     }
 264 }
 265
 266 static const char *feature_name(int feature)
 267 {
 268     static const char *name[] = {
 269         [PORT_CONNECTION]    = "connection",
 270         [PORT_ENABLE]        = "enable",
 271         [PORT_SUSPEND]       = "suspend",
 272         [PORT_OVERCURRENT]   = "overcurrent",
 273         [PORT_RESET]         = "reset",
 274         [PORT_POWER]         = "power",
 275         [PORT_LOWSPEED]      = "lowspeed",
 276         [PORT_HIGHSPEED]     = "highspeed",
 277         [PORT_C_CONNECTION]  = "change connection",
 278         [PORT_C_ENABLE]      = "change enable",
 279         [PORT_C_SUSPEND]     = "change suspend",
 280         [PORT_C_OVERCURRENT] = "change overcurrent",
 281         [PORT_C_RESET]       = "change reset",
 282         [PORT_TEST]          = "test",
 283         [PORT_INDICATOR]     = "indicator",
 284     };
 285     if (feature < 0 || feature >= ARRAY_SIZE(name)) {
 286         return "?";
 287     }
 288     return name[feature] ?: "?";
 289 }
 290
 291 static void usb_hub_handle_control(USBDevice *dev, USBPacket *p,
 292                int request, int value, int index, int length, uint8_t *data)
 293 {
 294     USBHubState *s = (USBHubState *)dev;
 295     int ret;
 296
 297     trace_usb_hub_control(s->dev.addr, request, value, index, length);
 298
 299     ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
 300     if (ret >= 0) {
 301         return;
 302     }
 303
 304     switch(request) {
 305     case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
 306         if (value == 0 && index != 0x81) { /* clear ep halt */
 307             goto fail;
 308         }
 309         break;
 310         /* usb specific requests */
 311     case GetHubStatus:
 312         data[0] = 0;
 313         data[1] = 0;
 314         data[2] = 0;
 315         data[3] = 0;
 316         p->actual_length = 4;
 317         break;
 318     case GetPortStatus:
 319         {
 320             unsigned int n = index - 1;
 321             USBHubPort *port;
 322             if (n >= NUM_PORTS) {
 323                 goto fail;
 324             }
 325             port = &s->ports[n];
 326             trace_usb_hub_get_port_status(s->dev.addr, index,
 327                                           port->wPortStatus,
 328                                           port->wPortChange);
 329             data[0] = port->wPortStatus;
 330             data[1] = port->wPortStatus >> 8;
 331             data[2] = port->wPortChange;
 332             data[3] = port->wPortChange >> 8;
 333             p->actual_length = 4;
 334         }
 335         break;
 336     case SetHubFeature:
 337     case ClearHubFeature:
 338         if (value != 0 && value != 1) {
 339             goto fail;
 340         }
 341         break;
 342     case SetPortFeature:
 343         {
 344             unsigned int n = index - 1;
 345             USBHubPort *port;
 346             USBDevice *dev;
 347
 348             trace_usb_hub_set_port_feature(s->dev.addr, index,
 349                                            feature_name(value));
 350
 351             if (n >= NUM_PORTS) {
 352                 goto fail;
 353             }
 354             port = &s->ports[n];
 355             dev = port->port.dev;
 356             switch(value) {
 357             case PORT_SUSPEND:
 358                 port->wPortStatus |= PORT_STAT_SUSPEND;
 359                 break;
 360             case PORT_RESET:
 361                 if (dev && dev->attached) {
 362                     usb_device_reset(dev);
 363                     port->wPortChange |= PORT_STAT_C_RESET;
 364                     /* set enable bit */
 365                     port->wPortStatus |= PORT_STAT_ENABLE;
 366                 }
 367                 break;
 368             case PORT_POWER:
 369                 break;
 370             default:
 371                 goto fail;
 372             }
 373         }
 374         break;
 375     case ClearPortFeature:
 376         {
 377             unsigned int n = index - 1;
 378             USBHubPort *port;
 379
 380             trace_usb_hub_clear_port_feature(s->dev.addr, index,
 381                                              feature_name(value));
 382
 383             if (n >= NUM_PORTS) {
 384                 goto fail;
 385             }
 386             port = &s->ports[n];
 387             switch(value) {
 388             case PORT_ENABLE:
 389                 port->wPortStatus &= ~PORT_STAT_ENABLE;
 390                 break;
 391             case PORT_C_ENABLE:
 392                 port->wPortChange &= ~PORT_STAT_C_ENABLE;
 393                 break;
 394             case PORT_SUSPEND:
 395                 port->wPortStatus &= ~PORT_STAT_SUSPEND;
 396                 break;
 397             case PORT_C_SUSPEND:
 398                 port->wPortChange &= ~PORT_STAT_C_SUSPEND;
 399                 break;
 400             case PORT_C_CONNECTION:
 401                 port->wPortChange &= ~PORT_STAT_C_CONNECTION;
 402                 break;
 403             case PORT_C_OVERCURRENT:
 404                 port->wPortChange &= ~PORT_STAT_C_OVERCURRENT;
 405                 break;
 406             case PORT_C_RESET:
 407                 port->wPortChange &= ~PORT_STAT_C_RESET;
 408                 break;
 409             default:
 410                 goto fail;
 411             }
 412         }
 413         break;
 414     case GetHubDescriptor:
 415         {
 416             unsigned int n, limit, var_hub_size = 0;
 417             memcpy(data, qemu_hub_hub_descriptor,
 418                    sizeof(qemu_hub_hub_descriptor));
 419             data[2] = NUM_PORTS;
 420
 421             /* fill DeviceRemovable bits */
 422             limit = ((NUM_PORTS + 1 + 7) / 8) + 7;
 423             for (n = 7; n < limit; n++) {
 424                 data[n] = 0x00;
 425                 var_hub_size++;
 426             }
 427
 428             /* fill PortPwrCtrlMask bits */
 429             limit = limit + ((NUM_PORTS + 7) / 8);
 430             for (;n < limit; n++) {
 431                 data[n] = 0xff;
 432                 var_hub_size++;
 433             }
 434
 435             p->actual_length = sizeof(qemu_hub_hub_descriptor) + var_hub_size;
 436             data[0] = p->actual_length;
 437             break;
 438         }
 439     default:
 440     fail:
 441         p->status = USB_RET_STALL;
 442         break;
 443     }
 444 }
 445
 446 static void usb_hub_handle_data(USBDevice *dev, USBPacket *p)
 447 {
 448     USBHubState *s = (USBHubState *)dev;
 449
 450     switch(p->pid) {
 451     case USB_TOKEN_IN:
 452         if (p->ep->nr == 1) {
 453             USBHubPort *port;
 454             unsigned int status;
 455             uint8_t buf[4];
 456             int i, n;
 457             n = (NUM_PORTS + 1 + 7) / 8;
 458             if (p->iov.size == 1) { /* FreeBSD workaround */
 459                 n = 1;
 460             } else if (n > p->iov.size) {
 461                 p->status = USB_RET_BABBLE;
 462                 return;
 463             }
 464             status = 0;
 465             for(i = 0; i < NUM_PORTS; i++) {
 466                 port = &s->ports[i];
 467                 if (port->wPortChange)
 468                     status |= (1 << (i + 1));
 469             }
 470             if (status != 0) {
 471                 for(i = 0; i < n; i++) {
 472                     buf[i] = status >> (8 * i);
 473                 }
 474                 usb_packet_copy(p, buf, n);
 475             } else {
 476                 p->status = USB_RET_NAK; /* usb11 11.13.1 */
 477             }
 478         } else {
 479             goto fail;
 480         }
 481         break;
 482     case USB_TOKEN_OUT:
 483     default:
 484     fail:
 485         p->status = USB_RET_STALL;
 486         break;
 487     }
 488 }
 489
 490 static void usb_hub_handle_destroy(USBDevice *dev)
 491 {
 492     USBHubState *s = (USBHubState *)dev;
 493     int i;
 494
 495     for (i = 0; i < NUM_PORTS; i++) {
 496         usb_unregister_port(usb_bus_from_device(dev),
 497                             &s->ports[i].port);
 498     }
 499 }
 500
 501 static USBPortOps usb_hub_port_ops = {
 502     .attach = usb_hub_attach,
 503     .detach = usb_hub_detach,
 504     .child_detach = usb_hub_child_detach,
 505     .wakeup = usb_hub_wakeup,
 506     .complete = usb_hub_complete,
 507 };
 508
 509 static int usb_hub_initfn(USBDevice *dev)
 510 {
 511     USBHubState *s = DO_UPCAST(USBHubState, dev, dev);
 512     USBHubPort *port;
 513     int i;
 514
 515     usb_desc_create_serial(dev);
 516     usb_desc_init(dev);
 517     s->intr = usb_ep_get(dev, USB_TOKEN_IN, 1);
 518     for (i = 0; i < NUM_PORTS; i++) {
 519         port = &s->ports[i];
 520         usb_register_port(usb_bus_from_device(dev),
 521                           &port->port, s, i, &usb_hub_port_ops,
 522                           USB_SPEED_MASK_LOW | USB_SPEED_MASK_FULL);
 523         usb_port_location(&port->port, dev->port, i+1);
 524     }
 525     usb_hub_handle_reset(dev);
 526     return 0;
 527 }
 528
 529 static const VMStateDescription vmstate_usb_hub_port = {
 530     .name = "usb-hub-port",
 531     .version_id = 1,
 532     .minimum_version_id = 1,
 533     .fields = (VMStateField []) {
 534         VMSTATE_UINT16(wPortStatus, USBHubPort),
 535         VMSTATE_UINT16(wPortChange, USBHubPort),
 536         VMSTATE_END_OF_LIST()
 537     }
 538 };
 539
 540 static const VMStateDescription vmstate_usb_hub = {
 541     .name = "usb-hub",
 542     .version_id = 1,
 543     .minimum_version_id = 1,
 544     .fields = (VMStateField []) {
 545         VMSTATE_USB_DEVICE(dev, USBHubState),
 546         VMSTATE_STRUCT_ARRAY(ports, USBHubState, NUM_PORTS, 0,
 547                              vmstate_usb_hub_port, USBHubPort),
 548         VMSTATE_END_OF_LIST()
 549     }
 550 };
 551
 552 static void usb_hub_class_initfn(ObjectClass *klass, void *data)
 553 {
 554     DeviceClass *dc = DEVICE_CLASS(klass);
 555     USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
 556
 557     uc->init           = usb_hub_initfn;
 558     uc->product_desc   = "QEMU USB Hub";
 559     uc->usb_desc       = &desc_hub;
 560     uc->find_device    = usb_hub_find_device;
 561     uc->handle_reset   = usb_hub_handle_reset;
 562     uc->handle_control = usb_hub_handle_control;
 563     uc->handle_data    = usb_hub_handle_data;
 564     uc->handle_destroy = usb_hub_handle_destroy;
 565     dc->fw_name = "hub";
 566     dc->vmsd = &vmstate_usb_hub;
 567 }
 568
 569 static TypeInfo hub_info = {
 570     .name          = "usb-hub",
 571     .parent        = TYPE_USB_DEVICE,
 572     .instance_size = sizeof(USBHubState),
 573     .class_init    = usb_hub_class_initfn,
 574 };
 575
 576 static void usb_hub_register_types(void)
 577 {
 578     type_register_static(&hub_info);
 579 }
 580
 581 type_init(usb_hub_register_types)