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 #include "qemu/error-report.h"
  29
  30 #define NUM_PORTS 8
  31
  32 typedef struct USBHubPort {
  33     USBPort port;
  34     uint16_t wPortStatus;
  35     uint16_t wPortChange;
  36     uint16_t wPortChange_reported;
  37 } USBHubPort;
  38
  39 typedef struct USBHubState {
  40     USBDevice dev;
  41     USBEndpoint *intr;
  42     USBHubPort ports[NUM_PORTS];
  43 } USBHubState;
  44
  45 #define ClearHubFeature         (0x2000 | USB_REQ_CLEAR_FEATURE)
  46 #define ClearPortFeature        (0x2300 | USB_REQ_CLEAR_FEATURE)
  47 #define GetHubDescriptor        (0xa000 | USB_REQ_GET_DESCRIPTOR)
  48 #define GetHubStatus            (0xa000 | USB_REQ_GET_STATUS)
  49 #define GetPortStatus           (0xa300 | USB_REQ_GET_STATUS)
  50 #define SetHubFeature           (0x2000 | USB_REQ_SET_FEATURE)
  51 #define SetPortFeature          (0x2300 | USB_REQ_SET_FEATURE)
  52
  53 #define PORT_STAT_CONNECTION    0x0001
  54 #define PORT_STAT_ENABLE        0x0002
  55 #define PORT_STAT_SUSPEND       0x0004
  56 #define PORT_STAT_OVERCURRENT   0x0008
  57 #define PORT_STAT_RESET         0x0010
  58 #define PORT_STAT_POWER         0x0100
  59 #define PORT_STAT_LOW_SPEED     0x0200
  60 #define PORT_STAT_HIGH_SPEED    0x0400
  61 #define PORT_STAT_TEST          0x0800
  62 #define PORT_STAT_INDICATOR     0x1000
  63
  64 #define PORT_STAT_C_CONNECTION  0x0001
  65 #define PORT_STAT_C_ENABLE      0x0002
  66 #define PORT_STAT_C_SUSPEND     0x0004
  67 #define PORT_STAT_C_OVERCURRENT 0x0008
  68 #define PORT_STAT_C_RESET       0x0010
  69
  70 #define PORT_CONNECTION         0
  71 #define PORT_ENABLE             1
  72 #define PORT_SUSPEND            2
  73 #define PORT_OVERCURRENT        3
  74 #define PORT_RESET              4
  75 #define PORT_POWER              8
  76 #define PORT_LOWSPEED           9
  77 #define PORT_HIGHSPEED          10
  78 #define PORT_C_CONNECTION       16
  79 #define PORT_C_ENABLE           17
  80 #define PORT_C_SUSPEND          18
  81 #define PORT_C_OVERCURRENT      19
  82 #define PORT_C_RESET            20
  83 #define PORT_TEST               21
  84 #define PORT_INDICATOR          22
  85
  86 /* same as Linux kernel root hubs */
  87
  88 enum {
  89     STR_MANUFACTURER = 1,
  90     STR_PRODUCT,
  91     STR_SERIALNUMBER,
  92 };
  93
  94 static const USBDescStrings desc_strings = {
  95     [STR_MANUFACTURER] = "QEMU",
  96     [STR_PRODUCT]      = "QEMU USB Hub",
  97     [STR_SERIALNUMBER] = "314159",
  98 };
  99
 100 static const USBDescIface desc_iface_hub = {
 101     .bInterfaceNumber              = 0,
 102     .bNumEndpoints                 = 1,
 103     .bInterfaceClass               = USB_CLASS_HUB,
 104     .eps = (USBDescEndpoint[]) {
 105         {
 106             .bEndpointAddress      = USB_DIR_IN | 0x01,
 107             .bmAttributes          = USB_ENDPOINT_XFER_INT,
 108             .wMaxPacketSize        = 1 + (NUM_PORTS + 7) / 8,
 109             .bInterval             = 0xff,
 110         },
 111     }
 112 };
 113
 114 static const USBDescDevice desc_device_hub = {
 115     .bcdUSB                        = 0x0110,
 116     .bDeviceClass                  = USB_CLASS_HUB,
 117     .bMaxPacketSize0               = 8,
 118     .bNumConfigurations            = 1,
 119     .confs = (USBDescConfig[]) {
 120         {
 121             .bNumInterfaces        = 1,
 122             .bConfigurationValue   = 1,
 123             .bmAttributes          = 0xe0,
 124             .nif = 1,
 125             .ifs = &desc_iface_hub,
 126         },
 127     },
 128 };
 129
 130 static const USBDesc desc_hub = {
 131     .id = {
 132         .idVendor          = 0x0409,
 133         .idProduct         = 0x55aa,
 134         .bcdDevice         = 0x0101,
 135         .iManufacturer     = STR_MANUFACTURER,
 136         .iProduct          = STR_PRODUCT,
 137         .iSerialNumber     = STR_SERIALNUMBER,
 138     },
 139     .full = &desc_device_hub,
 140     .str  = desc_strings,
 141 };
 142
 143 static const uint8_t qemu_hub_hub_descriptor[] =
 144 {
 145         0x00,                   /*  u8  bLength; patched in later */
 146         0x29,                   /*  u8  bDescriptorType; Hub-descriptor */
 147         0x00,                   /*  u8  bNbrPorts; (patched later) */
 148         0x0a,                   /* u16  wHubCharacteristics; */
 149         0x00,                   /*   (per-port OC, no power switching) */
 150         0x01,                   /*  u8  bPwrOn2pwrGood; 2ms */
 151         0x00                    /*  u8  bHubContrCurrent; 0 mA */
 152
 153         /* DeviceRemovable and PortPwrCtrlMask patched in later */
 154 };
 155
 156 static void usb_hub_attach(USBPort *port1)
 157 {
 158     USBHubState *s = port1->opaque;
 159     USBHubPort *port = &s->ports[port1->index];
 160
 161     trace_usb_hub_attach(s->dev.addr, port1->index + 1);
 162     port->wPortStatus |= PORT_STAT_CONNECTION;
 163     port->wPortChange |= PORT_STAT_C_CONNECTION;
 164     if (port->port.dev->speed == USB_SPEED_LOW) {
 165         port->wPortStatus |= PORT_STAT_LOW_SPEED;
 166     } else {
 167         port->wPortStatus &= ~PORT_STAT_LOW_SPEED;
 168     }
 169     usb_wakeup(s->intr, 0);
 170 }
 171
 172 static void usb_hub_detach(USBPort *port1)
 173 {
 174     USBHubState *s = port1->opaque;
 175     USBHubPort *port = &s->ports[port1->index];
 176
 177     trace_usb_hub_detach(s->dev.addr, port1->index + 1);
 178     usb_wakeup(s->intr, 0);
 179
 180     /* Let upstream know the device on this port is gone */
 181     s->dev.port->ops->child_detach(s->dev.port, port1->dev);
 182
 183     port->wPortStatus &= ~PORT_STAT_CONNECTION;
 184     port->wPortChange |= PORT_STAT_C_CONNECTION;
 185     if (port->wPortStatus & PORT_STAT_ENABLE) {
 186         port->wPortStatus &= ~PORT_STAT_ENABLE;
 187         port->wPortChange |= PORT_STAT_C_ENABLE;
 188     }
 189     usb_wakeup(s->intr, 0);
 190 }
 191
 192 static void usb_hub_child_detach(USBPort *port1, USBDevice *child)
 193 {
 194     USBHubState *s = port1->opaque;
 195
 196     /* Pass along upstream */
 197     s->dev.port->ops->child_detach(s->dev.port, child);
 198 }
 199
 200 static void usb_hub_wakeup(USBPort *port1)
 201 {
 202     USBHubState *s = port1->opaque;
 203     USBHubPort *port = &s->ports[port1->index];
 204
 205     if (port->wPortStatus & PORT_STAT_SUSPEND) {
 206         port->wPortChange |= PORT_STAT_C_SUSPEND;
 207         usb_wakeup(s->intr, 0);
 208     }
 209 }
 210
 211 static void usb_hub_complete(USBPort *port, USBPacket *packet)
 212 {
 213     USBHubState *s = port->opaque;
 214
 215     /*
 216      * Just pass it along upstream for now.
 217      *
 218      * If we ever implement usb 2.0 split transactions this will
 219      * become a little more complicated ...
 220      *
 221      * Can't use usb_packet_complete() here because packet->owner is
 222      * cleared already, go call the ->complete() callback directly
 223      * instead.
 224      */
 225     s->dev.port->ops->complete(s->dev.port, packet);
 226 }
 227
 228 static USBDevice *usb_hub_find_device(USBDevice *dev, uint8_t addr)
 229 {
 230     USBHubState *s = DO_UPCAST(USBHubState, dev, dev);
 231     USBHubPort *port;
 232     USBDevice *downstream;
 233     int i;
 234
 235     for (i = 0; i < NUM_PORTS; i++) {
 236         port = &s->ports[i];
 237         if (!(port->wPortStatus & PORT_STAT_ENABLE)) {
 238             continue;
 239         }
 240         downstream = usb_find_device(&port->port, addr);
 241         if (downstream != NULL) {
 242             return downstream;
 243         }
 244     }
 245     return NULL;
 246 }
 247
 248 static void usb_hub_handle_reset(USBDevice *dev)
 249 {
 250     USBHubState *s = DO_UPCAST(USBHubState, dev, dev);
 251     USBHubPort *port;
 252     int i;
 253
 254     trace_usb_hub_reset(s->dev.addr);
 255     for (i = 0; i < NUM_PORTS; i++) {
 256         port = s->ports + i;
 257         port->wPortStatus = PORT_STAT_POWER;
 258         port->wPortChange = 0;
 259         if (port->port.dev && port->port.dev->attached) {
 260             port->wPortStatus |= PORT_STAT_CONNECTION;
 261             port->wPortChange |= PORT_STAT_C_CONNECTION;
 262             if (port->port.dev->speed == USB_SPEED_LOW) {
 263                 port->wPortStatus |= PORT_STAT_LOW_SPEED;
 264             }
 265         }
 266     }
 267 }
 268
 269 static const char *feature_name(int feature)
 270 {
 271     static const char *name[] = {
 272         [PORT_CONNECTION]    = "connection",
 273         [PORT_ENABLE]        = "enable",
 274         [PORT_SUSPEND]       = "suspend",
 275         [PORT_OVERCURRENT]   = "overcurrent",
 276         [PORT_RESET]         = "reset",
 277         [PORT_POWER]         = "power",
 278         [PORT_LOWSPEED]      = "lowspeed",
 279         [PORT_HIGHSPEED]     = "highspeed",
 280         [PORT_C_CONNECTION]  = "change connection",
 281         [PORT_C_ENABLE]      = "change enable",
 282         [PORT_C_SUSPEND]     = "change suspend",
 283         [PORT_C_OVERCURRENT] = "change overcurrent",
 284         [PORT_C_RESET]       = "change reset",
 285         [PORT_TEST]          = "test",
 286         [PORT_INDICATOR]     = "indicator",
 287     };
 288     if (feature < 0 || feature >= ARRAY_SIZE(name)) {
 289         return "?";
 290     }
 291     return name[feature] ?: "?";
 292 }
 293
 294 static void usb_hub_handle_control(USBDevice *dev, USBPacket *p,
 295                int request, int value, int index, int length, uint8_t *data)
 296 {
 297     USBHubState *s = (USBHubState *)dev;
 298     int ret;
 299
 300     trace_usb_hub_control(s->dev.addr, request, value, index, length);
 301
 302     ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
 303     if (ret >= 0) {
 304         return;
 305     }
 306
 307     switch(request) {
 308     case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
 309         if (value == 0 && index != 0x81) { /* clear ep halt */
 310             goto fail;
 311         }
 312         break;
 313         /* usb specific requests */
 314     case GetHubStatus:
 315         data[0] = 0;
 316         data[1] = 0;
 317         data[2] = 0;
 318         data[3] = 0;
 319         p->actual_length = 4;
 320         break;
 321     case GetPortStatus:
 322         {
 323             unsigned int n = index - 1;
 324             USBHubPort *port;
 325             if (n >= NUM_PORTS) {
 326                 goto fail;
 327             }
 328             port = &s->ports[n];
 329             trace_usb_hub_get_port_status(s->dev.addr, index,
 330                                           port->wPortStatus,
 331                                           port->wPortChange);
 332             data[0] = port->wPortStatus;
 333             data[1] = port->wPortStatus >> 8;
 334             data[2] = port->wPortChange;
 335             data[3] = port->wPortChange >> 8;
 336             p->actual_length = 4;
 337         }
 338         break;
 339     case SetHubFeature:
 340     case ClearHubFeature:
 341         if (value != 0 && value != 1) {
 342             goto fail;
 343         }
 344         break;
 345     case SetPortFeature:
 346         {
 347             unsigned int n = index - 1;
 348             USBHubPort *port;
 349             USBDevice *dev;
 350
 351             trace_usb_hub_set_port_feature(s->dev.addr, index,
 352                                            feature_name(value));
 353
 354             if (n >= NUM_PORTS) {
 355                 goto fail;
 356             }
 357             port = &s->ports[n];
 358             dev = port->port.dev;
 359             switch(value) {
 360             case PORT_SUSPEND:
 361                 port->wPortStatus |= PORT_STAT_SUSPEND;
 362                 break;
 363             case PORT_RESET:
 364                 if (dev && dev->attached) {
 365                     usb_device_reset(dev);
 366                     port->wPortChange |= PORT_STAT_C_RESET;
 367                     /* set enable bit */
 368                     port->wPortStatus |= PORT_STAT_ENABLE;
 369                     usb_wakeup(s->intr, 0);
 370                 }
 371                 break;
 372             case PORT_POWER:
 373                 break;
 374             default:
 375                 goto fail;
 376             }
 377         }
 378         break;
 379     case ClearPortFeature:
 380         {
 381             unsigned int n = index - 1;
 382             USBHubPort *port;
 383
 384             trace_usb_hub_clear_port_feature(s->dev.addr, index,
 385                                              feature_name(value));
 386
 387             if (n >= NUM_PORTS) {
 388                 goto fail;
 389             }
 390             port = &s->ports[n];
 391             switch(value) {
 392             case PORT_ENABLE:
 393                 port->wPortStatus &= ~PORT_STAT_ENABLE;
 394                 break;
 395             case PORT_C_ENABLE:
 396                 port->wPortChange &= ~PORT_STAT_C_ENABLE;
 397                 break;
 398             case PORT_SUSPEND:
 399                 port->wPortStatus &= ~PORT_STAT_SUSPEND;
 400                 break;
 401             case PORT_C_SUSPEND:
 402                 port->wPortChange &= ~PORT_STAT_C_SUSPEND;
 403                 break;
 404             case PORT_C_CONNECTION:
 405                 port->wPortChange &= ~PORT_STAT_C_CONNECTION;
 406                 break;
 407             case PORT_C_OVERCURRENT:
 408                 port->wPortChange &= ~PORT_STAT_C_OVERCURRENT;
 409                 break;
 410             case PORT_C_RESET:
 411                 port->wPortChange &= ~PORT_STAT_C_RESET;
 412                 break;
 413             default:
 414                 goto fail;
 415             }
 416         }
 417         break;
 418     case GetHubDescriptor:
 419         {
 420             unsigned int n, limit, var_hub_size = 0;
 421             memcpy(data, qemu_hub_hub_descriptor,
 422                    sizeof(qemu_hub_hub_descriptor));
 423             data[2] = NUM_PORTS;
 424
 425             /* fill DeviceRemovable bits */
 426             limit = ((NUM_PORTS + 1 + 7) / 8) + 7;
 427             for (n = 7; n < limit; n++) {
 428                 data[n] = 0x00;
 429                 var_hub_size++;
 430             }
 431
 432             /* fill PortPwrCtrlMask bits */
 433             limit = limit + ((NUM_PORTS + 7) / 8);
 434             for (;n < limit; n++) {
 435                 data[n] = 0xff;
 436                 var_hub_size++;
 437             }
 438
 439             p->actual_length = sizeof(qemu_hub_hub_descriptor) + var_hub_size;
 440             data[0] = p->actual_length;
 441             break;
 442         }
 443     default:
 444     fail:
 445         p->status = USB_RET_STALL;
 446         break;
 447     }
 448 }
 449
 450 static void usb_hub_handle_data(USBDevice *dev, USBPacket *p)
 451 {
 452     USBHubState *s = (USBHubState *)dev;
 453
 454     switch(p->pid) {
 455     case USB_TOKEN_IN:
 456         if (p->ep->nr == 1) {
 457             USBHubPort *port;
 458             unsigned int status;
 459             uint8_t buf[4];
 460             int i, n;
 461             n = (NUM_PORTS + 1 + 7) / 8;
 462             if (p->iov.size == 1) { /* FreeBSD workaround */
 463                 n = 1;
 464             } else if (n > p->iov.size) {
 465                 p->status = USB_RET_BABBLE;
 466                 return;
 467             }
 468             status = 0;
 469             for(i = 0; i < NUM_PORTS; i++) {
 470                 port = &s->ports[i];
 471                 if (port->wPortChange &&
 472                     port->wPortChange_reported != port->wPortChange) {
 473                     status |= (1 << (i + 1));
 474                 }
 475                 port->wPortChange_reported = port->wPortChange;
 476             }
 477             if (status != 0) {
 478                 for(i = 0; i < n; i++) {
 479                     buf[i] = status >> (8 * i);
 480                 }
 481                 usb_packet_copy(p, buf, n);
 482             } else {
 483                 p->status = USB_RET_NAK; /* usb11 11.13.1 */
 484             }
 485         } else {
 486             goto fail;
 487         }
 488         break;
 489     case USB_TOKEN_OUT:
 490     default:
 491     fail:
 492         p->status = USB_RET_STALL;
 493         break;
 494     }
 495 }
 496
 497 static void usb_hub_handle_destroy(USBDevice *dev)
 498 {
 499     USBHubState *s = (USBHubState *)dev;
 500     int i;
 501
 502     for (i = 0; i < NUM_PORTS; i++) {
 503         usb_unregister_port(usb_bus_from_device(dev),
 504                             &s->ports[i].port);
 505     }
 506 }
 507
 508 static USBPortOps usb_hub_port_ops = {
 509     .attach = usb_hub_attach,
 510     .detach = usb_hub_detach,
 511     .child_detach = usb_hub_child_detach,
 512     .wakeup = usb_hub_wakeup,
 513     .complete = usb_hub_complete,
 514 };
 515
 516 static int usb_hub_initfn(USBDevice *dev)
 517 {
 518     USBHubState *s = DO_UPCAST(USBHubState, dev, dev);
 519     USBHubPort *port;
 520     int i;
 521
 522     if (dev->port->hubcount == 5) {
 523         error_report("usb hub chain too deep");
 524         return -1;
 525     }
 526
 527     usb_desc_create_serial(dev);
 528     usb_desc_init(dev);
 529     s->intr = usb_ep_get(dev, USB_TOKEN_IN, 1);
 530     for (i = 0; i < NUM_PORTS; i++) {
 531         port = &s->ports[i];
 532         usb_register_port(usb_bus_from_device(dev),
 533                           &port->port, s, i, &usb_hub_port_ops,
 534                           USB_SPEED_MASK_LOW | USB_SPEED_MASK_FULL);
 535         usb_port_location(&port->port, dev->port, i+1);
 536     }
 537     usb_hub_handle_reset(dev);
 538     return 0;
 539 }
 540
 541 static const VMStateDescription vmstate_usb_hub_port = {
 542     .name = "usb-hub-port",
 543     .version_id = 1,
 544     .minimum_version_id = 1,
 545     .fields = (VMStateField []) {
 546         VMSTATE_UINT16(wPortStatus, USBHubPort),
 547         VMSTATE_UINT16(wPortChange, USBHubPort),
 548         VMSTATE_END_OF_LIST()
 549     }
 550 };
 551
 552 static const VMStateDescription vmstate_usb_hub = {
 553     .name = "usb-hub",
 554     .version_id = 1,
 555     .minimum_version_id = 1,
 556     .fields = (VMStateField []) {
 557         VMSTATE_USB_DEVICE(dev, USBHubState),
 558         VMSTATE_STRUCT_ARRAY(ports, USBHubState, NUM_PORTS, 0,
 559                              vmstate_usb_hub_port, USBHubPort),
 560         VMSTATE_END_OF_LIST()
 561     }
 562 };
 563
 564 static void usb_hub_class_initfn(ObjectClass *klass, void *data)
 565 {
 566     DeviceClass *dc = DEVICE_CLASS(klass);
 567     USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
 568
 569     uc->init           = usb_hub_initfn;
 570     uc->product_desc   = "QEMU USB Hub";
 571     uc->usb_desc       = &desc_hub;
 572     uc->find_device    = usb_hub_find_device;
 573     uc->handle_reset   = usb_hub_handle_reset;
 574     uc->handle_control = usb_hub_handle_control;
 575     uc->handle_data    = usb_hub_handle_data;
 576     uc->handle_destroy = usb_hub_handle_destroy;
 577     dc->fw_name = "hub";
 578     dc->vmsd = &vmstate_usb_hub;
 579 }
 580
 581 static const TypeInfo hub_info = {
 582     .name          = "usb-hub",
 583     .parent        = TYPE_USB_DEVICE,
 584     .instance_size = sizeof(USBHubState),
 585     .class_init    = usb_hub_class_initfn,
 586 };
 587
 588 static void usb_hub_register_types(void)
 589 {
 590     type_register_static(&hub_info);
 591 }
 592
 593 type_init(usb_hub_register_types)