src/usbwrap.cc

   1 ///
   2 /// \file       usbwrap.cc
   3 ///             USB API wrapper
   4 ///
   5
   6 /*
   7     Copyright (C) 2005-2008, Chris Frey
   8
   9     This program is free software; you can redistribute it and/or modify
  10     it under the terms of the GNU General Public License as published by
  11     the Free Software Foundation; either version 2 of the License, or
  12     (at your option) any later version.
  13
  14     This program is distributed in the hope that it will be useful,
  15     but WITHOUT ANY WARRANTY; without even the implied warranty of
  16     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  17
  18     See the GNU General Public License in the COPYING file at the
  19     root directory of this project for more details.
  20 */
  21
  22
  23 #include "usbwrap.h"
  24 #include "data.h"
  25 #include "error.h"
  26 #include "debug.h"
  27
  28 #include <iomanip>
  29 #include <sstream>
  30 #include <errno.h>
  31 #include <string.h>
  32
  33 #ifndef __DEBUG_MODE__
  34 #define __DEBUG_MODE__
  35 #endif
  36 #include "debug.h"
  37
  38 namespace Usb {
  39
  40 ///////////////////////////////////////////////////////////////////////////////
  41 // Usb::Error exception class
  42
  43 static std::string GetErrorString(int libusb_errcode, const std::string &str)
  44 {
  45         std::ostringstream oss;
  46         oss << "(";
  47
  48         if( libusb_errcode ) {
  49                 oss << std::setbase(10) << libusb_errcode << ", ";
  50         }
  51
  52 //      oss << strerror(-libusb_errno) << "): "
  53         oss << usb_strerror() << "): ";
  54         oss << str;
  55         return oss.str();
  56 }
  57
  58 Error::Error(const std::string &str)
  59         : Barry::Error(GetErrorString(0, str))
  60         , m_libusb_errcode(0)
  61 {
  62 }
  63
  64 Error::Error(int libusb_errcode, const std::string &str)
  65         : Barry::Error(GetErrorString(libusb_errcode, str))
  66         , m_libusb_errcode(libusb_errcode)
  67 {
  68 }
  69
  70
  71 ///////////////////////////////////////////////////////////////////////////////
  72 // Match
  73
  74 Match::Match(int vendor, int product,
  75                 const char *busname, const char *devname)
  76         : m_busses(0)
  77         , m_dev(0)
  78         , m_vendor(vendor)
  79         , m_product(product)
  80         , m_busname(busname)
  81         , m_devname(devname)
  82 {
  83         usb_find_busses();
  84         usb_find_devices();
  85         m_busses = usb_get_busses();
  86 }
  87
  88 Match::~Match()
  89 {
  90 }
  91
  92 bool Match::ToNum(const char *str, long &num)
  93 {
  94         char *end = 0;
  95         num = strtol(str, &end, 10);
  96         return  num >= 0 &&                     // no negative numbers
  97                 num != LONG_MIN && num != LONG_MAX &&   // no overflow
  98                 str != end && *end == '\0';     // whole string valid
  99 }
 100
 101 //
 102 // Linux treats bus and device path names as numbers, sometimes left
 103 // padded with zeros.  Other platforms, such as Windows, use strings,
 104 // such as "bus-1" or similar.
 105 //
 106 // Here we try to convert each string to a number, and if successful,
 107 // compare them.  If unable to convert, then compare as strings.
 108 // This way, "3" == "003" and "bus-foobar" == "bus-foobar".
 109 //
 110 bool Match::NameCompare(const char *n1, const char *n2)
 111 {
 112         long l1, l2;
 113         if( ToNum(n1, l1) && ToNum(n2, l2) ) {
 114                 return l1 == l2;
 115         }
 116         else {
 117                 return strcmp(n1, n2) == 0;
 118         }
 119 }
 120
 121 bool Match::next_device(Usb::DeviceIDType *devid)
 122 {
 123         for( ; m_busses; m_busses = m_busses->next ) {
 124
 125                 // only search on given bus
 126                 if( m_busname && !NameCompare(m_busname, m_busses->dirname) )
 127                         continue;
 128
 129                 if( !m_dev )
 130                         m_dev = m_busses->devices;
 131
 132                 for( ; m_dev; m_dev = m_dev->next ) {
 133
 134                         // search for specific device
 135                         if( m_devname && !NameCompare(m_devname, m_dev->filename) )
 136                                 continue;
 137
 138                         // is there a match?
 139                         if( m_dev->descriptor.idVendor == m_vendor &&
 140                             m_dev->descriptor.idProduct == m_product ) {
 141                                 // found!
 142                                 *devid = m_dev;
 143
 144                                 // advance for next time
 145                                 m_dev = m_dev->next;
 146                                 if( !m_dev )
 147                                         m_busses = m_busses->next;
 148
 149                                 // done
 150                                 return true;
 151                         }
 152                 }
 153         }
 154         return false;
 155 }
 156
 157
 158 ///////////////////////////////////////////////////////////////////////////////
 159 // Device
 160
 161 Device::Device(Usb::DeviceIDType id, int timeout)
 162         : m_id(id),
 163         m_timeout(timeout)
 164 {
 165         dout("usb_open(" << std::dec << id << ")");
 166         m_handle = usb_open(id);
 167         if( !m_handle )
 168                 throw Error("open failed");
 169 }
 170
 171 Device::~Device()
 172 {
 173         dout("usb_close(" << std::dec << m_handle << ")");
 174         usb_close(m_handle);
 175 }
 176
 177 bool Device::SetConfiguration(unsigned char cfg)
 178 {
 179         dout("usb_set_configuration(" << std::dec << m_handle << "," << std::dec << (unsigned int) cfg << ")");
 180         int ret = usb_set_configuration(m_handle, cfg);
 181         m_lasterror = ret;
 182         return ret >= 0;
 183 }
 184
 185 bool Device::ClearHalt(int ep)
 186 {
 187         dout("usb_clear_halt(" << std::dec << m_handle << "," << std::dec << ep << ")");
 188         int ret = usb_clear_halt(m_handle, ep);
 189         m_lasterror = ret;
 190         return ret >= 0;
 191 }
 192
 193 bool Device::Reset()
 194 {
 195         dout("usb_reset(" << std::dec << m_handle << ")");
 196         int ret = usb_reset(m_handle);
 197         m_lasterror = ret;
 198         return ret == 0;
 199 }
 200
 201 bool Device::BulkRead(int ep, Barry::Data &data, int timeout)
 202 {
 203         int ret;
 204         do {
 205                 ret = usb_bulk_read(m_handle, ep,
 206                         (char*) data.GetBuffer(), data.GetBufSize(),
 207                         timeout == -1 ? m_timeout : timeout);
 208                 if( ret < 0 && ret != -EINTR && ret != -EAGAIN ) {
 209                         m_lasterror = ret;
 210                         if( ret == -ETIMEDOUT )
 211                                 throw Timeout(ret, "Timeout in usb_bulk_read");
 212                         else
 213                                 throw Error(ret, "Error in usb_bulk_read");
 214                 }
 215                 data.ReleaseBuffer(ret);
 216         } while( ret == -EINTR || ret == -EAGAIN );
 217
 218         return ret >= 0;
 219 }
 220
 221 bool Device::BulkWrite(int ep, const Barry::Data &data, int timeout)
 222 {
 223         ddout("BulkWrite to endpoint " << std::dec << ep << ":\n" << data);
 224         int ret;
 225         do {
 226                 ret = usb_bulk_write(m_handle, ep,
 227                         (char*) data.GetData(), data.GetSize(),
 228                         timeout == -1 ? m_timeout : timeout);
 229                 if( ret < 0 && ret != -EINTR && ret != -EAGAIN ) {
 230                         m_lasterror = ret;
 231                         if( ret == -ETIMEDOUT )
 232                                 throw Timeout(ret, "Timeout in usb_bulk_write");
 233                         else
 234                                 throw Error(ret, "Error in usb_bulk_write");
 235                 }
 236         } while( ret == -EINTR || ret == -EAGAIN );
 237
 238         return ret >= 0;
 239 }
 240
 241 bool Device::BulkWrite(int ep, const void *data, size_t size, int timeout)
 242 {
 243 #ifdef __DEBUG_MODE__
 244         Barry::Data dump(data, size);
 245         ddout("BulkWrite to endpoint " << std::dec << ep << ":\n" << dump);
 246 #endif
 247
 248         int ret;
 249         do {
 250                 ret = usb_bulk_write(m_handle, ep,
 251                         (char*) data, size,
 252                         timeout == -1 ? m_timeout : timeout);
 253                 if( ret < 0 && ret != -EINTR && ret != -EAGAIN ) {
 254                         m_lasterror = ret;
 255                         if( ret == -ETIMEDOUT )
 256                                 throw Timeout(ret, "Timeout in usb_bulk_read");
 257                         else
 258                                 throw Error(ret, "Error in usb_bulk_read");
 259                 }
 260         } while( ret == -EINTR || ret == -EAGAIN );
 261
 262         return ret >= 0;
 263 }
 264
 265 bool Device::InterruptRead(int ep, Barry::Data &data, int timeout)
 266 {
 267         int ret;
 268         do {
 269                 ret = usb_interrupt_read(m_handle, ep,
 270                         (char*) data.GetBuffer(), data.GetBufSize(),
 271                         timeout == -1 ? m_timeout : timeout);
 272                 if( ret < 0 && ret != -EINTR && ret != -EAGAIN ) {
 273                         m_lasterror = ret;
 274                         if( ret == -ETIMEDOUT )
 275                                 throw Timeout(ret, "Timeout in usb_bulk_read");
 276                         else
 277                                 throw Error(ret, "Error in usb_bulk_read");
 278                 }
 279                 data.ReleaseBuffer(ret);
 280         } while( ret == -EINTR || ret == -EAGAIN );
 281
 282         return ret >= 0;
 283 }
 284
 285 bool Device::InterruptWrite(int ep, const Barry::Data &data, int timeout)
 286 {
 287         ddout("InterruptWrite to endpoint " << std::dec << ep << ":\n" << data);
 288
 289         int ret;
 290         do {
 291                 ret = usb_interrupt_write(m_handle, ep,
 292                         (char*) data.GetData(), data.GetSize(),
 293                         timeout == -1 ? m_timeout : timeout);
 294                 if( ret < 0 && ret != -EINTR && ret != -EAGAIN ) {
 295                         m_lasterror = ret;
 296                         if( ret == -ETIMEDOUT )
 297                                 throw Timeout(ret, "Timeout in usb_bulk_read");
 298                         else
 299                                 throw Error(ret, "Error in usb_bulk_read");
 300                 }
 301         } while( ret == -EINTR || ret == -EAGAIN );
 302
 303         return ret >= 0;
 304 }
 305
 306 //
 307 // BulkDrain
 308 //
 309 /// Reads anything available on the given endpoint, with a low timeout,
 310 /// in order to clear any pending reads.
 311 ///
 312 void Device::BulkDrain(int ep)
 313 {
 314         try {
 315                 Barry::Data data;
 316                 while( BulkRead(ep, data, 100) )
 317                 ;
 318         }
 319         catch( Usb::Error & ) {}
 320 }
 321
 322 //
 323 // GetConfiguration
 324 //
 325 /// Uses the GET_CONFIGURATION control message to determine the currently
 326 /// selected USB configuration, returning it in the cfg argument.
 327 /// If unsuccessful, returns false.
 328 ///
 329 bool Device::GetConfiguration(unsigned char &cfg)
 330 {
 331         int result = usb_control_msg(m_handle, 0x80, USB_REQ_GET_CONFIGURATION, 0, 0,
 332                 (char*) &cfg, 1, m_timeout);
 333         m_lasterror = result;
 334         return result >= 0;
 335 }
 336
 337
 338
 339 ///////////////////////////////////////////////////////////////////////////////
 340 // Interface
 341
 342 Interface::Interface(Device &dev, int iface)
 343         : m_dev(dev), m_iface(iface)
 344 {
 345         dout("usb_claim_interface(" << dev.GetHandle() << "," << std::dec << iface << ")");
 346         int ret = usb_claim_interface(dev.GetHandle(), iface);
 347         if( ret < 0 )
 348                 throw Error(ret, "claim interface failed");
 349 }
 350
 351 Interface::~Interface()
 352 {
 353         dout("usb_release_interface(" << m_dev.GetHandle() << "," << std::dec << m_iface << ")");
 354         usb_release_interface(m_dev.GetHandle(), m_iface);
 355 }
 356
 357
 358
 359 ///////////////////////////////////////////////////////////////////////////////
 360 // EndpointDiscovery
 361
 362 bool EndpointDiscovery::Discover(struct usb_interface_descriptor *interface, int epcount)
 363 {
 364         // start fresh
 365         clear();
 366         m_valid = false;
 367
 368         EndpointPair pair;
 369
 370         if( !interface || !interface->endpoint ) {
 371                 dout("EndpointDiscovery::Discover: empty interface pointer");
 372                 return false;
 373         }
 374
 375         for( int i = 0; i < epcount; i++ ) {
 376                 // load descriptor
 377                 usb_endpoint_descriptor desc;
 378                 desc = interface->endpoint[i];
 379                 dout("      endpoint_desc #" << i << " loaded"
 380                         << "\nbLength: " << (unsigned ) desc.bLength
 381                         << "\nbDescriptorType: " << (unsigned ) desc.bDescriptorType
 382                         << "\nbEndpointAddress: " << (unsigned ) desc.bEndpointAddress
 383                         << "\nbmAttributes: " << (unsigned ) desc.bmAttributes
 384                         << "\nwMaxPacketSize: " << (unsigned ) desc.wMaxPacketSize
 385                         << "\nbInterval: " << (unsigned ) desc.bInterval
 386                         << "\nbRefresh: " << (unsigned ) desc.bRefresh
 387                         << "\nbSynchAddress: " << (unsigned ) desc.bSynchAddress
 388                         << "\n"
 389                         );
 390
 391                 // add to the map
 392                 (*this)[desc.bEndpointAddress] = desc;
 393                 dout("      endpoint added to map with bEndpointAddress: " << (unsigned int)desc.bEndpointAddress);
 394
 395                 // parse the endpoint into read/write sets, if possible,
 396                 // going in discovery order...
 397                 // Assumptions:
 398                 //      - endpoints of related utility will be grouped
 399                 //      - endpoints with same type will be grouped
 400                 //      - endpoints that do not meet the above assumptions
 401                 //              do not belong in a pair
 402                 unsigned char type = desc.bmAttributes & USB_ENDPOINT_TYPE_MASK;
 403                 if( desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK ) {
 404                         // read endpoint
 405                         pair.read = desc.bEndpointAddress;
 406                         dout("        pair.read = " << (unsigned int)pair.read);
 407                         if( pair.IsTypeSet() && pair.type != type ) {
 408                                 // if type is already set, we must start over
 409                                 pair.write = 0;
 410                         }
 411                 }
 412                 else {
 413                         // write endpoint
 414                         pair.write = desc.bEndpointAddress;
 415                         dout("        pair.write = " << (unsigned int)pair.write);
 416                         if( pair.IsTypeSet() && pair.type != type ) {
 417                                 // if type is already set, we must start over
 418                                 pair.read = 0;
 419                         }
 420                 }
 421                 // save the type last
 422                 pair.type = type;
 423                 dout("        pair.type = " << (unsigned int)pair.type);
 424
 425                 // if pair is complete, add to array
 426                 if( pair.IsComplete() ) {
 427                         m_endpoints.push_back(pair);
 428                         dout("        pair added! ("
 429                                 << "read: " << (unsigned int)pair.read << ","
 430                                 << "write: " << (unsigned int)pair.write << ","
 431                                 << "type: " << (unsigned int)pair.type << ")");
 432                         pair = EndpointPair();  // clear
 433                 }
 434         }
 435
 436         // just for debugging purposes, check for extra descriptors, and
 437         // dump them to dout if they exist
 438         if( interface->extra ) {
 439                 dout("while parsing endpoints, found a block of extra descriptors:");
 440                 Barry::Data data(interface->extra, interface->extralen);
 441                 dout(data);
 442         }
 443
 444         return m_valid = true;
 445 }
 446
 447
 448 ///////////////////////////////////////////////////////////////////////////////
 449 // InterfaceDiscovery
 450
 451 bool InterfaceDiscovery::DiscoverInterface(struct usb_interface *interface)
 452 {
 453         if( !interface->altsetting ) {
 454                 dout("InterfaceDiscovery::DiscoverIterface: empty altsetting");
 455                 // some devices are buggy and return a higher bNumInterfaces
 456                 // than the number of interfaces available... in this case
 457                 // we just skip and continue
 458                 return true;
 459         }
 460
 461         for( int i = 0; i < interface->num_altsetting; i++ ) {
 462                 // load descriptor
 463                 InterfaceDesc desc;
 464                 desc.desc = interface->altsetting[i];
 465                 dout("    interface_desc #" << i << " loaded"
 466                         << "\nbLength: " << (unsigned) desc.desc.bLength
 467                         << "\nbDescriptorType: " << (unsigned) desc.desc.bDescriptorType
 468                         << "\nbInterfaceNumber: " << (unsigned) desc.desc.bInterfaceNumber
 469                         << "\nbAlternateSetting: " << (unsigned) desc.desc.bAlternateSetting
 470                         << "\nbNumEndpoints: " << (unsigned) desc.desc.bNumEndpoints
 471                         << "\nbInterfaceClass: " << (unsigned) desc.desc.bInterfaceClass
 472                         << "\nbInterfaceSubClass: " << (unsigned) desc.desc.bInterfaceSubClass
 473                         << "\nbInterfaceProtocol: " << (unsigned) desc.desc.bInterfaceProtocol
 474                         << "\niInterface: " << (unsigned) desc.desc.iInterface
 475                         << "\n"
 476                         );
 477
 478                 // load all endpoints on this interface
 479                 if( !desc.endpoints.Discover(&desc.desc, desc.desc.bNumEndpoints) ) {
 480                         dout("    endpoint discovery failed for bInterfaceNumber: " << (unsigned int)desc.desc.bInterfaceNumber << ", not added to map.");
 481                         return false;
 482                 }
 483
 484                 // add to the map
 485                 (*this)[desc.desc.bInterfaceNumber] = desc;
 486                 dout("    interface added to map with bInterfaceNumber: " << (unsigned int)desc.desc.bInterfaceNumber);
 487         }
 488         return true;
 489 }
 490
 491 bool InterfaceDiscovery::Discover(Usb::DeviceIDType devid, int cfgidx, int ifcount)
 492 {
 493         // start fresh
 494         clear();
 495         m_valid = false;
 496
 497         if( !devid || !devid->config || !devid->config[cfgidx].interface ) {
 498                 dout("InterfaceDiscovery::Discover: empty devid/config/interface");
 499                 return false;
 500         }
 501
 502         for( int i = 0; i < ifcount; i++ ) {
 503                 if( !DiscoverInterface(&devid->config[cfgidx].interface[i]) )
 504                         return false;
 505         }
 506
 507         return m_valid = true;
 508 }
 509
 510
 511 ///////////////////////////////////////////////////////////////////////////////
 512 // ConfigDiscovery
 513
 514 bool ConfigDiscovery::Discover(Usb::DeviceIDType devid, int cfgcount)
 515 {
 516         // start fresh
 517         clear();
 518         m_valid = false;
 519
 520         for( int i = 0; i < cfgcount; i++ ) {
 521                 // load descriptor
 522                 ConfigDesc desc;
 523                 if( !devid || !devid->config ) {
 524                         dout("ConfigDiscovery::Discover: empty devid or config");
 525                         return false;
 526                 }
 527                 desc.desc = devid->config[i];
 528                 dout("  config_desc #" << i << " loaded"
 529                         << "\nbLength: " << (unsigned int) desc.desc.bLength
 530                         << "\nbDescriptorType: " << (unsigned int) desc.desc.bDescriptorType
 531                         << "\nwTotalLength: " << (unsigned int) desc.desc.wTotalLength
 532                         << "\nbNumInterfaces: " << (unsigned int) desc.desc.bNumInterfaces
 533                         << "\nbConfigurationValue: " << (unsigned int) desc.desc.bConfigurationValue
 534                         << "\niConfiguration: " << (unsigned int) desc.desc.iConfiguration
 535                         << "\nbmAttributes: " << (unsigned int) desc.desc.bmAttributes
 536                         << "\nMaxPower: " << (unsigned int) desc.desc.MaxPower
 537                         << "\n"
 538                         );
 539
 540                 // just for debugging purposes, check for extra descriptors, and
 541                 // dump them to dout if they exist
 542                 if( desc.desc.extra ) {
 543                         dout("while parsing config descriptor, found a block of extra descriptors:");
 544                         Barry::Data data(desc.desc.extra, desc.desc.extralen);
 545                         dout(data);
 546                 }
 547
 548                 // load all interfaces on this configuration
 549                 if( !desc.interfaces.Discover(devid, i, desc.desc.bNumInterfaces) ) {
 550                         dout("  config discovery failed for bConfigurationValue: " << (unsigned int)desc.desc.bConfigurationValue << ", not added to map.");
 551                         return false;
 552                 }
 553
 554                 // add to the map
 555                 (*this)[desc.desc.bConfigurationValue] = desc;
 556                 dout("  config added to map with bConfigurationValue: " << (unsigned int)desc.desc.bConfigurationValue);
 557         }
 558
 559         return m_valid = true;
 560 }
 561
 562
 563 ///////////////////////////////////////////////////////////////////////////////
 564 // DeviceDiscovery
 565
 566 DeviceDiscovery::DeviceDiscovery(Usb::DeviceIDType devid)
 567         : m_valid(false)
 568 {
 569         Discover(devid);
 570 }
 571
 572 bool DeviceDiscovery::Discover(Usb::DeviceIDType devid)
 573 {
 574         // start fresh
 575         configs.clear();
 576         m_valid = false;
 577
 578         // copy the descriptor over to our memory
 579         if( !devid ) {
 580                 dout("DeviceDiscovery::Discover: empty devid");
 581                 return false;
 582         }
 583
 584         desc = devid->descriptor;
 585         dout("device_desc loaded"
 586                 << "\nbLength: " << (unsigned int) desc.bLength
 587                 << "\nbDescriptorType: " << (unsigned int) desc.bDescriptorType
 588                 << "\nbcdUSB: " << (unsigned int) desc.bcdUSB
 589                 << "\nbDeviceClass: " << (unsigned int) desc.bDeviceClass
 590                 << "\nbDeviceSubClass: " << (unsigned int) desc.bDeviceSubClass
 591                 << "\nbDeviceProtocol: " << (unsigned int) desc.bDeviceProtocol
 592                 << "\nbMaxPacketSize0: " << (unsigned int) desc.bMaxPacketSize0
 593                 << "\nidVendor: " << (unsigned int) desc.idVendor
 594                 << "\nidProduct: " << (unsigned int) desc.idProduct
 595                 << "\nbcdDevice: " << (unsigned int) desc.bcdDevice
 596                 << "\niManufacturer: " << (unsigned int) desc.iManufacturer
 597                 << "\niProduct: " << (unsigned int) desc.iProduct
 598                 << "\niSerialNumber: " << (unsigned int) desc.iSerialNumber
 599                 << "\nbNumConfigurations: " << (unsigned int) desc.bNumConfigurations
 600                 << "\n"
 601         );
 602
 603         m_valid = configs.Discover(devid, desc.bNumConfigurations);
 604         return m_valid;
 605 }
 606
 607 } // namespace Usb
 608