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