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/osdep.h"
  25 #include "qapi/error.h"
  26 #include "qemu-common.h"
  27 #include "trace.h"
  28 #include "hw/usb.h"
  29 #include "hw/usb/desc.h"
  30 #include "qemu/error-report.h"
  31
  32 #define NUM_PORTS 8
  33
  34 typedef struct USBHubPort {
  35     USBPort port;
  36     uint16_t wPortStatus;
  37     uint16_t wPortChange;
  38 } USBHubPort;
  39
  40 typedef struct USBHubState {
  41     USBDevice dev;
  42     USBEndpoint *intr;
  43     USBHubPort ports[NUM_PORTS];
  44 } USBHubState;
  45
  46 #define TYPE_USB_HUB "usb-hub"
  47 #define USB_HUB(obj) OBJECT_CHECK(USBHubState, (obj), TYPE_USB_HUB)
  48
  49 #define ClearHubFeature         (0x2000 | USB_REQ_CLEAR_FEATURE)
  50 #define ClearPortFeature        (0x2300 | USB_REQ_CLEAR_FEATURE)
  51 #define GetHubDescriptor        (0xa000 | USB_REQ_GET_DESCRIPTOR)
  52 #define GetHubStatus            (0xa000 | USB_REQ_GET_STATUS)
  53 #define GetPortStatus           (0xa300 | USB_REQ_GET_STATUS)
  54 #define SetHubFeature           (0x2000 | USB_REQ_SET_FEATURE)
  55 #define SetPortFeature          (0x2300 | USB_REQ_SET_FEATURE)
  56
  57 #define PORT_STAT_CONNECTION    0x0001
  58 #define PORT_STAT_ENABLE        0x0002
  59 #define PORT_STAT_SUSPEND       0x0004
  60 #define PORT_STAT_OVERCURRENT   0x0008
  61 #define PORT_STAT_RESET         0x0010
  62 #define PORT_STAT_POWER         0x0100
  63 #define PORT_STAT_LOW_SPEED     0x0200
  64 #define PORT_STAT_HIGH_SPEED    0x0400
  65 #define PORT_STAT_TEST          0x0800
  66 #define PORT_STAT_INDICATOR     0x1000
  67
  68 #define PORT_STAT_C_CONNECTION  0x0001
  69 #define PORT_STAT_C_ENABLE      0x0002
  70 #define PORT_STAT_C_SUSPEND     0x0004
  71 #define PORT_STAT_C_OVERCURRENT 0x0008
  72 #define PORT_STAT_C_RESET       0x0010
  73
  74 #define PORT_CONNECTION         0
  75 #define PORT_ENABLE             1
  76 #define PORT_SUSPEND            2
  77 #define PORT_OVERCURRENT        3
  78 #define PORT_RESET              4
  79 #define PORT_POWER              8
  80 #define PORT_LOWSPEED           9
  81 #define PORT_HIGHSPEED          10
  82 #define PORT_C_CONNECTION       16
  83 #define PORT_C_ENABLE           17
  84 #define PORT_C_SUSPEND          18
  85 #define PORT_C_OVERCURRENT      19
  86 #define PORT_C_RESET            20
  87 #define PORT_TEST               21
  88 #define PORT_INDICATOR          22
  89
  90 /* same as Linux kernel root hubs */
  91
  92 enum {
  93     STR_MANUFACTURER = 1,
  94     STR_PRODUCT,
  95     STR_SERIALNUMBER,
  96 };
  97
  98 static const USBDescStrings desc_strings = {
  99     [STR_MANUFACTURER] = "QEMU",
 100     [STR_PRODUCT]      = "QEMU USB Hub",
 101     [STR_SERIALNUMBER] = "314159",
 102 };
 103
 104 static const USBDescIface desc_iface_hub = {
 105     .bInterfaceNumber              = 0,
 106     .bNumEndpoints                 = 1,
 107     .bInterfaceClass               = USB_CLASS_HUB,
 108     .eps = (USBDescEndpoint[]) {
 109         {
 110             .bEndpointAddress      = USB_DIR_IN | 0x01,
 111             .bmAttributes          = USB_ENDPOINT_XFER_INT,
 112             .wMaxPacketSize        = 1 + DIV_ROUND_UP(NUM_PORTS, 8),
 113             .bInterval             = 0xff,
 114         },
 115     }
 116 };
 117
 118 static const USBDescDevice desc_device_hub = {
 119     .bcdUSB                        = 0x0110,
 120     .bDeviceClass                  = USB_CLASS_HUB,
 121     .bMaxPacketSize0               = 8,
 122     .bNumConfigurations            = 1,
 123     .confs = (USBDescConfig[]) {
 124         {
 125             .bNumInterfaces        = 1,
 126             .bConfigurationValue   = 1,
 127             .bmAttributes          = USB_CFG_ATT_ONE | USB_CFG_ATT_SELFPOWER |
 128                                      USB_CFG_ATT_WAKEUP,
 129             .nif = 1,
 130             .ifs = &desc_iface_hub,
 131         },
 132     },
 133 };
 134
 135 static const USBDesc desc_hub = {
 136     .id = {
 137         .idVendor          = 0x0409,
 138         .idProduct         = 0x55aa,
 139         .bcdDevice         = 0x0101,
 140         .iManufacturer     = STR_MANUFACTURER,
 141         .iProduct          = STR_PRODUCT,
 142         .iSerialNumber     = STR_SERIALNUMBER,
 143     },
 144     .full = &desc_device_hub,
 145     .str  = desc_strings,
 146 };
 147
 148 static const uint8_t qemu_hub_hub_descriptor[] =
 149 {
 150         0x00,                   /*  u8  bLength; patched in later */
 151         0x29,                   /*  u8  bDescriptorType; Hub-descriptor */
 152         0x00,                   /*  u8  bNbrPorts; (patched later) */
 153         0x0a,                   /* u16  wHubCharacteristics; */
 154         0x00,                   /*   (per-port OC, no power switching) */
 155         0x01,                   /*  u8  bPwrOn2pwrGood; 2ms */
 156         0x00                    /*  u8  bHubContrCurrent; 0 mA */
 157
 158         /* DeviceRemovable and PortPwrCtrlMask patched in later */
 159 };
 160
 161 static void usb_hub_attach(USBPort *port1)
 162 {
 163     USBHubState *s = port1->opaque;
 164     USBHubPort *port = &s->ports[port1->index];
 165
 166     trace_usb_hub_attach(s->dev.addr, port1->index + 1);
 167     port->wPortStatus |= PORT_STAT_CONNECTION;
 168     port->wPortChange |= PORT_STAT_C_CONNECTION;
 169     if (port->port.dev->speed == USB_SPEED_LOW) {
 170         port->wPortStatus |= PORT_STAT_LOW_SPEED;
 171     } else {
 172         port->wPortStatus &= ~PORT_STAT_LOW_SPEED;
 173     }
 174     usb_wakeup(s->intr, 0);
 175 }
 176
 177 static void usb_hub_detach(USBPort *port1)
 178 {
 179     USBHubState *s = port1->opaque;
 180     USBHubPort *port = &s->ports[port1->index];
 181
 182     trace_usb_hub_detach(s->dev.addr, port1->index + 1);
 183     usb_wakeup(s->intr, 0);
 184
 185     /* Let upstream know the device on this port is gone */
 186     s->dev.port->ops->child_detach(s->dev.port, port1->dev);
 187
 188     port->wPortStatus &= ~PORT_STAT_CONNECTION;
 189     port->wPortChange |= PORT_STAT_C_CONNECTION;
 190     if (port->wPortStatus & PORT_STAT_ENABLE) {
 191         port->wPortStatus &= ~PORT_STAT_ENABLE;
 192         port->wPortChange |= PORT_STAT_C_ENABLE;
 193     }
 194     usb_wakeup(s->intr, 0);
 195 }
 196
 197 static void usb_hub_child_detach(USBPort *port1, USBDevice *child)
 198 {
 199     USBHubState *s = port1->opaque;
 200
 201     /* Pass along upstream */
 202     s->dev.port->ops->child_detach(s->dev.port, child);
 203 }
 204
 205 static void usb_hub_wakeup(USBPort *port1)
 206 {
 207     USBHubState *s = port1->opaque;
 208     USBHubPort *port = &s->ports[port1->index];
 209
 210     if (port->wPortStatus & PORT_STAT_SUSPEND) {
 211         port->wPortStatus &= ~PORT_STAT_SUSPEND;
 212         port->wPortChange |= PORT_STAT_C_SUSPEND;
 213         usb_wakeup(s->intr, 0);
 214     }
 215 }
 216
 217 static void usb_hub_complete(USBPort *port, USBPacket *packet)
 218 {
 219     USBHubState *s = port->opaque;
 220
 221     /*
 222      * Just pass it along upstream for now.
 223      *
 224      * If we ever implement usb 2.0 split transactions this will
 225      * become a little more complicated ...
 226      *
 227      * Can't use usb_packet_complete() here because packet->owner is
 228      * cleared already, go call the ->complete() callback directly
 229      * instead.
 230      */
 231     s->dev.port->ops->complete(s->dev.port, packet);
 232 }
 233
 234 static USBDevice *usb_hub_find_device(USBDevice *dev, uint8_t addr)
 235 {
 236     USBHubState *s = USB_HUB(dev);
 237     USBHubPort *port;
 238     USBDevice *downstream;
 239     int i;
 240
 241     for (i = 0; i < NUM_PORTS; i++) {
 242         port = &s->ports[i];
 243         if (!(port->wPortStatus & PORT_STAT_ENABLE)) {
 244             continue;
 245         }
 246         downstream = usb_find_device(&port->port, addr);
 247         if (downstream != NULL) {
 248             return downstream;
 249         }
 250     }
 251     return NULL;
 252 }
 253
 254 static void usb_hub_handle_reset(USBDevice *dev)
 255 {
 256     USBHubState *s = USB_HUB(dev);
 257     USBHubPort *port;
 258     int i;
 259
 260     trace_usb_hub_reset(s->dev.addr);
 261     for (i = 0; i < NUM_PORTS; i++) {
 262         port = s->ports + i;
 263         port->wPortStatus = PORT_STAT_POWER;
 264         port->wPortChange = 0;
 265         if (port->port.dev && port->port.dev->attached) {
 266             port->wPortStatus |= PORT_STAT_CONNECTION;
 267             port->wPortChange |= PORT_STAT_C_CONNECTION;
 268             if (port->port.dev->speed == USB_SPEED_LOW) {
 269                 port->wPortStatus |= PORT_STAT_LOW_SPEED;
 270             }
 271         }
 272     }
 273 }
 274
 275 static const char *feature_name(int feature)
 276 {
 277     static const char *name[] = {
 278         [PORT_CONNECTION]    = "connection",
 279         [PORT_ENABLE]        = "enable",
 280         [PORT_SUSPEND]       = "suspend",
 281         [PORT_OVERCURRENT]   = "overcurrent",
 282         [PORT_RESET]         = "reset",
 283         [PORT_POWER]         = "power",
 284         [PORT_LOWSPEED]      = "lowspeed",
 285         [PORT_HIGHSPEED]     = "highspeed",
 286         [PORT_C_CONNECTION]  = "change connection",
 287         [PORT_C_ENABLE]      = "change enable",
 288         [PORT_C_SUSPEND]     = "change suspend",
 289         [PORT_C_OVERCURRENT] = "change overcurrent",
 290         [PORT_C_RESET]       = "change reset",
 291         [PORT_TEST]          = "test",
 292         [PORT_INDICATOR]     = "indicator",
 293     };
 294     if (feature < 0 || feature >= ARRAY_SIZE(name)) {
 295         return "?";
 296     }
 297     return name[feature] ?: "?";
 298 }
 299
 300 static void usb_hub_handle_control(USBDevice *dev, USBPacket *p,
 301                int request, int value, int index, int length, uint8_t *data)
 302 {
 303     USBHubState *s = (USBHubState *)dev;
 304     int ret;
 305
 306     trace_usb_hub_control(s->dev.addr, request, value, index, length);
 307
 308     ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
 309     if (ret >= 0) {
 310         return;
 311     }
 312
 313     switch(request) {
 314     case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
 315         if (value == 0 && index != 0x81) { /* clear ep halt */
 316             goto fail;
 317         }
 318         break;
 319         /* usb specific requests */
 320     case GetHubStatus:
 321         data[0] = 0;
 322         data[1] = 0;
 323         data[2] = 0;
 324         data[3] = 0;
 325         p->actual_length = 4;
 326         break;
 327     case GetPortStatus:
 328         {
 329             unsigned int n = index - 1;
 330             USBHubPort *port;
 331             if (n >= NUM_PORTS) {
 332                 goto fail;
 333             }
 334             port = &s->ports[n];
 335             trace_usb_hub_get_port_status(s->dev.addr, index,
 336                                           port->wPortStatus,
 337                                           port->wPortChange);
 338             data[0] = port->wPortStatus;
 339             data[1] = port->wPortStatus >> 8;
 340             data[2] = port->wPortChange;
 341             data[3] = port->wPortChange >> 8;
 342             p->actual_length = 4;
 343         }
 344         break;
 345     case SetHubFeature:
 346     case ClearHubFeature:
 347         if (value != 0 && value != 1) {
 348             goto fail;
 349         }
 350         break;
 351     case SetPortFeature:
 352         {
 353             unsigned int n = index - 1;
 354             USBHubPort *port;
 355             USBDevice *dev;
 356
 357             trace_usb_hub_set_port_feature(s->dev.addr, index,
 358                                            feature_name(value));
 359
 360             if (n >= NUM_PORTS) {
 361                 goto fail;
 362             }
 363             port = &s->ports[n];
 364             dev = port->port.dev;
 365             switch(value) {
 366             case PORT_SUSPEND:
 367                 port->wPortStatus |= PORT_STAT_SUSPEND;
 368                 break;
 369             case PORT_RESET:
 370                 if (dev && dev->attached) {
 371                     usb_device_reset(dev);
 372                     port->wPortChange |= PORT_STAT_C_RESET;
 373                     /* set enable bit */
 374                     port->wPortStatus |= PORT_STAT_ENABLE;
 375                     usb_wakeup(s->intr, 0);
 376                 }
 377                 break;
 378             case PORT_POWER:
 379                 break;
 380             default:
 381                 goto fail;
 382             }
 383         }
 384         break;
 385     case ClearPortFeature:
 386         {
 387             unsigned int n = index - 1;
 388             USBHubPort *port;
 389
 390             trace_usb_hub_clear_port_feature(s->dev.addr, index,
 391                                              feature_name(value));
 392
 393             if (n >= NUM_PORTS) {
 394                 goto fail;
 395             }
 396             port = &s->ports[n];
 397             switch(value) {
 398             case PORT_ENABLE:
 399                 port->wPortStatus &= ~PORT_STAT_ENABLE;
 400                 break;
 401             case PORT_C_ENABLE:
 402                 port->wPortChange &= ~PORT_STAT_C_ENABLE;
 403                 break;
 404             case PORT_SUSPEND:
 405                 if (port->wPortStatus & PORT_STAT_SUSPEND) {
 406                     port->wPortStatus &= ~PORT_STAT_SUSPEND;
 407
 408                     /*
 409                      * USB Spec rev2.0 11.24.2.7.2.3 C_PORT_SUSPEND
 410                      * "This bit is set on the following transitions:
 411                      *  - On transition from the Resuming state to the
 412                      *    SendEOP [sic] state"
 413                      *
 414                      * Note that this includes both remote wake-up and
 415                      * explicit ClearPortFeature(PORT_SUSPEND).
 416                      */
 417                     port->wPortChange |= PORT_STAT_C_SUSPEND;
 418                 }
 419                 break;
 420             case PORT_C_SUSPEND:
 421                 port->wPortChange &= ~PORT_STAT_C_SUSPEND;
 422                 break;
 423             case PORT_C_CONNECTION:
 424                 port->wPortChange &= ~PORT_STAT_C_CONNECTION;
 425                 break;
 426             case PORT_C_OVERCURRENT:
 427                 port->wPortChange &= ~PORT_STAT_C_OVERCURRENT;
 428                 break;
 429             case PORT_C_RESET:
 430                 port->wPortChange &= ~PORT_STAT_C_RESET;
 431                 break;
 432             default:
 433                 goto fail;
 434             }
 435         }
 436         break;
 437     case GetHubDescriptor:
 438         {
 439             unsigned int n, limit, var_hub_size = 0;
 440             memcpy(data, qemu_hub_hub_descriptor,
 441                    sizeof(qemu_hub_hub_descriptor));
 442             data[2] = NUM_PORTS;
 443
 444             /* fill DeviceRemovable bits */
 445             limit = DIV_ROUND_UP(NUM_PORTS + 1, 8) + 7;
 446             for (n = 7; n < limit; n++) {
 447                 data[n] = 0x00;
 448                 var_hub_size++;
 449             }
 450
 451             /* fill PortPwrCtrlMask bits */
 452             limit = limit + DIV_ROUND_UP(NUM_PORTS, 8);
 453             for (;n < limit; n++) {
 454                 data[n] = 0xff;
 455                 var_hub_size++;
 456             }
 457
 458             p->actual_length = sizeof(qemu_hub_hub_descriptor) + var_hub_size;
 459             data[0] = p->actual_length;
 460             break;
 461         }
 462     default:
 463     fail:
 464         p->status = USB_RET_STALL;
 465         break;
 466     }
 467 }
 468
 469 static void usb_hub_handle_data(USBDevice *dev, USBPacket *p)
 470 {
 471     USBHubState *s = (USBHubState *)dev;
 472
 473     switch(p->pid) {
 474     case USB_TOKEN_IN:
 475         if (p->ep->nr == 1) {
 476             USBHubPort *port;
 477             unsigned int status;
 478             uint8_t buf[4];
 479             int i, n;
 480             n = DIV_ROUND_UP(NUM_PORTS + 1, 8);
 481             if (p->iov.size == 1) { /* FreeBSD workaround */
 482                 n = 1;
 483             } else if (n > p->iov.size) {
 484                 p->status = USB_RET_BABBLE;
 485                 return;
 486             }
 487             status = 0;
 488             for(i = 0; i < NUM_PORTS; i++) {
 489                 port = &s->ports[i];
 490                 if (port->wPortChange)
 491                     status |= (1 << (i + 1));
 492             }
 493             if (status != 0) {
 494                 trace_usb_hub_status_report(s->dev.addr, status);
 495                 for(i = 0; i < n; i++) {
 496                     buf[i] = status >> (8 * i);
 497                 }
 498                 usb_packet_copy(p, buf, n);
 499             } else {
 500                 p->status = USB_RET_NAK; /* usb11 11.13.1 */
 501             }
 502         } else {
 503             goto fail;
 504         }
 505         break;
 506     case USB_TOKEN_OUT:
 507     default:
 508     fail:
 509         p->status = USB_RET_STALL;
 510         break;
 511     }
 512 }
 513
 514 static void usb_hub_unrealize(USBDevice *dev, Error **errp)
 515 {
 516     USBHubState *s = (USBHubState *)dev;
 517     int i;
 518
 519     for (i = 0; i < NUM_PORTS; i++) {
 520         usb_unregister_port(usb_bus_from_device(dev),
 521                             &s->ports[i].port);
 522     }
 523 }
 524
 525 static USBPortOps usb_hub_port_ops = {
 526     .attach = usb_hub_attach,
 527     .detach = usb_hub_detach,
 528     .child_detach = usb_hub_child_detach,
 529     .wakeup = usb_hub_wakeup,
 530     .complete = usb_hub_complete,
 531 };
 532
 533 static void usb_hub_realize(USBDevice *dev, Error **errp)
 534 {
 535     USBHubState *s = USB_HUB(dev);
 536     USBHubPort *port;
 537     int i;
 538
 539     if (dev->port->hubcount == 5) {
 540         error_setg(errp, "usb hub chain too deep");
 541         return;
 542     }
 543
 544     usb_desc_create_serial(dev);
 545     usb_desc_init(dev);
 546     s->intr = usb_ep_get(dev, USB_TOKEN_IN, 1);
 547     for (i = 0; i < NUM_PORTS; i++) {
 548         port = &s->ports[i];
 549         usb_register_port(usb_bus_from_device(dev),
 550                           &port->port, s, i, &usb_hub_port_ops,
 551                           USB_SPEED_MASK_LOW | USB_SPEED_MASK_FULL);
 552         usb_port_location(&port->port, dev->port, i+1);
 553     }
 554     usb_hub_handle_reset(dev);
 555 }
 556
 557 static const VMStateDescription vmstate_usb_hub_port = {
 558     .name = "usb-hub-port",
 559     .version_id = 1,
 560     .minimum_version_id = 1,
 561     .fields = (VMStateField[]) {
 562         VMSTATE_UINT16(wPortStatus, USBHubPort),
 563         VMSTATE_UINT16(wPortChange, USBHubPort),
 564         VMSTATE_END_OF_LIST()
 565     }
 566 };
 567
 568 static const VMStateDescription vmstate_usb_hub = {
 569     .name = "usb-hub",
 570     .version_id = 1,
 571     .minimum_version_id = 1,
 572     .fields = (VMStateField[]) {
 573         VMSTATE_USB_DEVICE(dev, USBHubState),
 574         VMSTATE_STRUCT_ARRAY(ports, USBHubState, NUM_PORTS, 0,
 575                              vmstate_usb_hub_port, USBHubPort),
 576         VMSTATE_END_OF_LIST()
 577     }
 578 };
 579
 580 static void usb_hub_class_initfn(ObjectClass *klass, void *data)
 581 {
 582     DeviceClass *dc = DEVICE_CLASS(klass);
 583     USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
 584
 585     uc->realize        = usb_hub_realize;
 586     uc->product_desc   = "QEMU USB Hub";
 587     uc->usb_desc       = &desc_hub;
 588     uc->find_device    = usb_hub_find_device;
 589     uc->handle_reset   = usb_hub_handle_reset;
 590     uc->handle_control = usb_hub_handle_control;
 591     uc->handle_data    = usb_hub_handle_data;
 592     uc->unrealize      = usb_hub_unrealize;
 593     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 594     dc->fw_name = "hub";
 595     dc->vmsd = &vmstate_usb_hub;
 596 }
 597
 598 static const TypeInfo hub_info = {
 599     .name          = TYPE_USB_HUB,
 600     .parent        = TYPE_USB_DEVICE,
 601     .instance_size = sizeof(USBHubState),
 602     .class_init    = usb_hub_class_initfn,
 603 };
 604
 605 static void usb_hub_register_types(void)
 606 {
 607     type_register_static(&hub_info);
 608 }
 609
 610 type_init(usb_hub_register_types)