src/lib/AdapterDetection.cpp

   1 /*
   2  * This file is part of the libCEC(R) library.
   3  *
   4  * libCEC(R) is Copyright (C) 2011 Pulse-Eight Limited.  All rights reserved.
   5  * libCEC(R) is an original work, containing original code.
   6  *
   7  * libCEC(R) is a trademark of Pulse-Eight Limited.
   8  *
   9  * This program is dual-licensed; 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.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22  *
  23  *
  24  * Alternatively, you can license this library under a commercial license,
  25  * please contact Pulse-Eight Licensing for more information.
  26  *
  27  * For more information contact:
  28  * Pulse-Eight Licensing       <license@pulse-eight.com>
  29  *     http://www.pulse-eight.com/
  30  *     http://www.pulse-eight.net/
  31  */
  32
  33 #include "AdapterDetection.h"
  34 #include "platform/os-dependent.h"
  35 #include "util/StdString.h"
  36
  37 #if !defined(__WINDOWS__)
  38 #include <dirent.h>
  39 #include <libudev.h>
  40 #include <poll.h>
  41 #else
  42 #include <setupapi.h>
  43
  44 // the virtual COM port only shows up when requesting devices with the raw device guid!
  45 static GUID USB_RAW_GUID =  { 0xA5DCBF10, 0x6530, 0x11D2, { 0x90, 0x1F, 0x00, 0xC0, 0x4F, 0xB9, 0x51, 0xED } };
  46 #endif
  47
  48 #define CEC_VID 0x2548
  49 #define CEC_PID 0x1001
  50
  51 using namespace CEC;
  52 using namespace std;
  53
  54 #if !defined(__WINDOWS__)
  55 bool TranslateComPort(CStdString &strString)
  56 {
  57   CStdString strTmp(strString);
  58   strTmp.MakeReverse();
  59   int iSlash = strTmp.Find('/');
  60   if (iSlash >= 0)
  61   {
  62     strTmp = strTmp.Left(iSlash);
  63     strTmp.MakeReverse();
  64     strString.Format("%s/%s:1.0/tty", strString.c_str(), strTmp.c_str());
  65     return true;
  66   }
  67
  68   return false;
  69 }
  70
  71 bool FindComPort(CStdString &strLocation)
  72 {
  73   CStdString strPort = strLocation;
  74   bool bReturn(!strPort.IsEmpty());
  75   CStdString strConfigLocation(strLocation);
  76   if (TranslateComPort(strConfigLocation))
  77   {
  78     DIR *dir;
  79     struct dirent *dirent;
  80     if((dir = opendir(strConfigLocation.c_str())) == NULL)
  81       return bReturn;
  82
  83     while ((dirent = readdir(dir)) != NULL)
  84     {
  85       if(strcmp((char*)dirent->d_name, "." ) != 0 && strcmp((char*)dirent->d_name, ".." ) != 0)
  86       {
  87         strPort.Format("/dev/%s", dirent->d_name);
  88         if (!strPort.IsEmpty())
  89         {
  90           strLocation = strPort;
  91           bReturn = true;
  92           break;
  93         }
  94       }
  95     }
  96     closedir(dir);
  97   }
  98
  99   return bReturn;
 100 }
 101 #endif
 102
 103 int CAdapterDetection::FindAdapters(vector<cec_adapter> &deviceList, const char *strDevicePath /* = NULL */)
 104 {
 105   int iFound(0);
 106
 107 #if !defined(__WINDOWS__)
 108   struct udev *udev;
 109   if (!(udev = udev_new()))
 110     return -1;
 111
 112   struct udev_enumerate *enumerate;
 113   struct udev_list_entry *devices, *dev_list_entry;
 114   struct udev_device *dev;
 115   enumerate = udev_enumerate_new(udev);
 116   udev_enumerate_scan_devices(enumerate);
 117   devices = udev_enumerate_get_list_entry(enumerate);
 118   udev_list_entry_foreach(dev_list_entry, devices)
 119   {
 120     const char *strPath;
 121     strPath = udev_list_entry_get_name(dev_list_entry);
 122
 123     dev = udev_device_new_from_syspath(udev, strPath);
 124     if (!dev)
 125       continue;
 126
 127     dev = udev_device_get_parent(udev_device_get_parent(dev));
 128     if (!dev)
 129       continue;
 130     if (!udev_device_get_sysattr_value(dev,"idVendor") || !udev_device_get_sysattr_value(dev, "idProduct"))
 131     {
 132       udev_device_unref(dev);
 133       continue;
 134     }
 135
 136     int iVendor, iProduct;
 137     sscanf(udev_device_get_sysattr_value(dev, "idVendor"), "%x", &iVendor);
 138     sscanf(udev_device_get_sysattr_value(dev, "idProduct"), "%x", &iProduct);
 139     if (iVendor == CEC_VID && iProduct == CEC_PID)
 140     {
 141       CStdString strPath(udev_device_get_syspath(dev));
 142       if (strDevicePath && strcmp(strPath.c_str(), strDevicePath))
 143         continue;
 144
 145       CStdString strComm(strPath);
 146       if (FindComPort(strComm))
 147       {
 148         cec_adapter foundDev;
 149         foundDev.path = strPath;
 150         foundDev.comm = strComm;
 151         deviceList.push_back(foundDev);
 152         ++iFound;
 153       }
 154     }
 155     udev_device_unref(dev);
 156   }
 157
 158   udev_enumerate_unref(enumerate);
 159   udev_unref(udev);
 160 #else
 161   HDEVINFO hDevHandle;
 162   DWORD    required = 0, iMemberIndex = 0;
 163   int      nBufferSize = 0;
 164
 165   SP_DEVICE_INTERFACE_DATA deviceInterfaceData;
 166   deviceInterfaceData.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);
 167
 168   SP_DEVINFO_DATA devInfoData;
 169   devInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
 170
 171   if ((hDevHandle = SetupDiGetClassDevs(&USB_RAW_GUID, 0, 0, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE)) == INVALID_HANDLE_VALUE)
 172     return iFound;
 173
 174   BOOL bResult = true;
 175   TCHAR *buffer = NULL;
 176   PSP_DEVICE_INTERFACE_DETAIL_DATA devicedetailData;
 177   while(bResult)
 178   {
 179     bResult = SetupDiEnumDeviceInfo(hDevHandle, iMemberIndex, &devInfoData);
 180
 181     if (bResult)
 182       bResult = SetupDiEnumDeviceInterfaces(hDevHandle, 0, &USB_RAW_GUID, iMemberIndex, &deviceInterfaceData);
 183
 184     if(!bResult)
 185     {
 186       SetupDiDestroyDeviceInfoList(hDevHandle);
 187       delete []buffer;
 188       buffer = NULL;
 189       return iFound;
 190     }
 191
 192     iMemberIndex++;
 193     BOOL bDetailResult = false;
 194     {
 195       // As per MSDN, Get the required buffer size. Call SetupDiGetDeviceInterfaceDetail with a
 196       // NULL DeviceInterfaceDetailData pointer, a DeviceInterfaceDetailDataSize of zero,
 197       // and a valid RequiredSize variable. In response to such a call, this function returns
 198       // the required buffer size at RequiredSize and fails with GetLastError returning
 199       // ERROR_INSUFFICIENT_BUFFER.
 200       // Allocate an appropriately sized buffer and call the function again to get the interface details.
 201
 202       SetupDiGetDeviceInterfaceDetail(hDevHandle, &deviceInterfaceData, NULL, 0, &required, NULL);
 203
 204       buffer = new TCHAR[required];
 205       devicedetailData = (PSP_DEVICE_INTERFACE_DETAIL_DATA) buffer;
 206       devicedetailData->cbSize = sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);
 207       nBufferSize = required;
 208     }
 209
 210     bDetailResult = SetupDiGetDeviceInterfaceDetail(hDevHandle, &deviceInterfaceData, devicedetailData, nBufferSize , &required, NULL);
 211     if(!bDetailResult)
 212       continue;
 213
 214     if (strDevicePath && strcmp(strDevicePath, devicedetailData->DevicePath) != 0)
 215       continue;
 216
 217     CStdString strVendorId;
 218     CStdString strProductId;
 219     CStdString strTmp(devicedetailData->DevicePath);
 220     strVendorId = strTmp.substr(strTmp.Find("vid_") + 4, 4);
 221     strProductId = strTmp.substr(strTmp.Find("pid_") + 4, 4);
 222     if (strTmp.Find("&mi_") >= 0 && strTmp.Find("&mi_00") < 0)
 223       continue;
 224
 225     int iVendor, iProduct;
 226     sscanf(strVendorId, "%x", &iVendor);
 227     sscanf(strProductId, "%x", &iProduct);
 228     if (iVendor != CEC_VID || iProduct != CEC_PID)
 229       continue;
 230
 231     HKEY hDeviceKey = SetupDiOpenDevRegKey(hDevHandle, &devInfoData, DICS_FLAG_GLOBAL, 0, DIREG_DEV, KEY_QUERY_VALUE);
 232     if (!hDeviceKey)
 233       continue;
 234
 235     TCHAR strPortName[256];
 236     strPortName[0] = _T('\0');
 237     DWORD dwSize = sizeof(strPortName);
 238     DWORD dwType = 0;
 239
 240     /* search the registry */
 241     if ((RegQueryValueEx(hDeviceKey, _T("PortName"), NULL, &dwType, reinterpret_cast<LPBYTE>(strPortName), &dwSize) == ERROR_SUCCESS) && (dwType == REG_SZ))
 242     {
 243       if (_tcslen(strPortName) > 3 && _tcsnicmp(strPortName, _T("COM"), 3) == 0 &&
 244         _ttoi(&(strPortName[3])) > 0)
 245       {
 246         cec_adapter foundDev;
 247         foundDev.path = devicedetailData->DevicePath;
 248         foundDev.comm = strPortName;
 249         deviceList.push_back(foundDev);
 250         ++iFound;
 251       }
 252     }
 253
 254     RegCloseKey(hDeviceKey);
 255   }
 256 #endif
 257
 258   return iFound;
 259 }