src/lib/CECDetect.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 "CECDetect.h"
  34 #include "libPlatform/os-dependent.h"
  35 #include "util/StdString.h"
  36 #include <string.h>
  37
  38 #if !defined(__WINDOWS__)
  39 #include <dirent.h>
  40 #include <libudev.h>
  41 #include <poll.h>
  42 #else
  43 #include <setupapi.h>
  44
  45 // the virtual COM port only shows up when requesting devices with the raw device guid!
  46 static GUID USB_RAW_GUID =  { 0xA5DCBF10, 0x6530, 0x11D2, { 0x90, 0x1F, 0x00, 0xC0, 0x4F, 0xB9, 0x51, 0xED } };
  47 #endif
  48
  49 #define CEC_VID 0x2548
  50 #define CEC_PID 0x1001
  51
  52 using namespace CEC;
  53 using namespace std;
  54
  55 #if !defined(__WINDOWS__)
  56 bool TranslateComPort(CStdString &strString)
  57 {
  58   CStdString strTmp(strString);
  59   strTmp.MakeReverse();
  60   int iSlash = strTmp.Find('/');
  61   if (iSlash >= 0)
  62   {
  63     strTmp = strTmp.Left(iSlash);
  64     strTmp.MakeReverse();
  65     strString.Format("%s/%s:1.0/tty", strString.c_str(), strTmp.c_str());
  66     return true;
  67   }
  68
  69   return false;
  70 }
  71
  72 bool FindComPort(CStdString &strLocation)
  73 {
  74   CStdString strPort = strLocation;
  75   bool bReturn(!strPort.IsEmpty());
  76   CStdString strConfigLocation(strLocation);
  77   if (TranslateComPort(strConfigLocation))
  78   {
  79     DIR *dir;
  80     struct dirent *dirent;
  81     if((dir = opendir(strConfigLocation.c_str())) == NULL)
  82       return bReturn;
  83
  84     while ((dirent = readdir(dir)) != NULL)
  85     {
  86       if(strcmp((char*)dirent->d_name, "." ) != 0 && strcmp((char*)dirent->d_name, ".." ) != 0)
  87       {
  88         strPort.Format("/dev/%s", dirent->d_name);
  89         if (!strPort.IsEmpty())
  90         {
  91           strLocation = strPort;
  92           bReturn = true;
  93           break;
  94         }
  95       }
  96     }
  97     closedir(dir);
  98   }
  99
 100   return bReturn;
 101 }
 102 #endif
 103
 104 int CCECDetect::FindDevices(vector<cec_device> &deviceList, const char *strDevicePath /* = NULL */)
 105 {
 106   int iFound(0);
 107
 108 #if !defined(__WINDOWS__)
 109   struct udev *udev;
 110   if (!(udev = udev_new()))
 111     return -1;
 112
 113   struct udev_enumerate *enumerate;
 114   struct udev_list_entry *devices, *dev_list_entry;
 115   struct udev_device *dev;
 116   enumerate = udev_enumerate_new(udev);
 117   udev_enumerate_scan_devices(enumerate);
 118   devices = udev_enumerate_get_list_entry(enumerate);
 119   udev_list_entry_foreach(dev_list_entry, devices)
 120   {
 121     const char *strPath;
 122     strPath = udev_list_entry_get_name(dev_list_entry);
 123
 124     dev = udev_device_new_from_syspath(udev, strPath);
 125     if (!dev)
 126       continue;
 127
 128     dev = udev_device_get_parent(udev_device_get_parent(dev));
 129     if (!dev)
 130       continue;
 131     if (!udev_device_get_sysattr_value(dev,"idVendor") || !udev_device_get_sysattr_value(dev, "idProduct"))
 132     {
 133       udev_device_unref(dev);
 134       continue;
 135     }
 136
 137     int iVendor, iProduct;
 138     sscanf(udev_device_get_sysattr_value(dev, "idVendor"), "%x", &iVendor);
 139     sscanf(udev_device_get_sysattr_value(dev, "idProduct"), "%x", &iProduct);
 140     if (iVendor == CEC_VID && iProduct == CEC_PID)
 141     {
 142       CStdString strPath(udev_device_get_syspath(dev));
 143       if (strDevicePath && strcmp(strPath.c_str(), strDevicePath))
 144         continue;
 145
 146       CStdString strComm(strPath);
 147       if (FindComPort(strComm))
 148       {
 149         cec_device foundDev;
 150         foundDev.path = strPath;
 151         foundDev.comm = strComm;
 152         deviceList.push_back(foundDev);
 153         ++iFound;
 154       }
 155     }
 156     udev_device_unref(dev);
 157   }
 158
 159   udev_enumerate_unref(enumerate);
 160   udev_unref(udev);
 161 #else
 162   HDEVINFO hDevHandle;
 163   DWORD    required = 0, iMemberIndex = 0;
 164   int      nBufferSize = 0;
 165
 166   SP_DEVICE_INTERFACE_DATA deviceInterfaceData;
 167   deviceInterfaceData.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);
 168
 169   SP_DEVINFO_DATA devInfoData;
 170   devInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
 171
 172   if ((hDevHandle = SetupDiGetClassDevs(&USB_RAW_GUID, 0, 0, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE)) == INVALID_HANDLE_VALUE)
 173     return iFound;
 174
 175   BOOL bResult = true;
 176   TCHAR *buffer = NULL;
 177   PSP_DEVICE_INTERFACE_DETAIL_DATA devicedetailData;
 178   while(bResult)
 179   {
 180     bResult = SetupDiEnumDeviceInfo(hDevHandle, iMemberIndex, &devInfoData);
 181
 182     if (bResult)
 183       bResult = SetupDiEnumDeviceInterfaces(hDevHandle, 0, &USB_RAW_GUID, iMemberIndex, &deviceInterfaceData);
 184
 185     if(!bResult)
 186     {
 187       SetupDiDestroyDeviceInfoList(hDevHandle);
 188       delete []buffer;
 189       buffer = NULL;
 190       return iFound;
 191     }
 192
 193     iMemberIndex++;
 194     BOOL bDetailResult = false;
 195     {
 196       // As per MSDN, Get the required buffer size. Call SetupDiGetDeviceInterfaceDetail with a
 197       // NULL DeviceInterfaceDetailData pointer, a DeviceInterfaceDetailDataSize of zero,
 198       // and a valid RequiredSize variable. In response to such a call, this function returns
 199       // the required buffer size at RequiredSize and fails with GetLastError returning
 200       // ERROR_INSUFFICIENT_BUFFER.
 201       // Allocate an appropriately sized buffer and call the function again to get the interface details.
 202
 203       SetupDiGetDeviceInterfaceDetail(hDevHandle, &deviceInterfaceData, NULL, 0, &required, NULL);
 204
 205       buffer = new TCHAR[required];
 206       devicedetailData = (PSP_DEVICE_INTERFACE_DETAIL_DATA) buffer;
 207       devicedetailData->cbSize = sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);
 208       nBufferSize = required;
 209     }
 210
 211     bDetailResult = SetupDiGetDeviceInterfaceDetail(hDevHandle, &deviceInterfaceData, devicedetailData, nBufferSize , &required, NULL);
 212     if(!bDetailResult)
 213       continue;
 214
 215     if (strDevicePath && strcmp(strDevicePath, devicedetailData->DevicePath) != 0)
 216       continue;
 217
 218     CStdString strVendorId;
 219     CStdString strProductId;
 220     CStdString strTmp(devicedetailData->DevicePath);
 221     strVendorId = strTmp.substr(strTmp.Find("vid_") + 4, 4);
 222     strProductId = strTmp.substr(strTmp.Find("pid_") + 4, 4);
 223     if (strTmp.Find("&mi_") >= 0 && strTmp.Find("&mi_00") < 0)
 224       continue;
 225
 226     int iVendor, iProduct;
 227     sscanf(strVendorId, "%x", &iVendor);
 228     sscanf(strProductId, "%x", &iProduct);
 229     if (iVendor != CEC_VID || iProduct != CEC_PID)
 230       continue;
 231
 232     HKEY hDeviceKey = SetupDiOpenDevRegKey(hDevHandle, &devInfoData, DICS_FLAG_GLOBAL, 0, DIREG_DEV, KEY_QUERY_VALUE);
 233     if (!hDeviceKey)
 234       continue;
 235
 236     TCHAR strPortName[256];
 237     strPortName[0] = _T('\0');
 238     DWORD dwSize = sizeof(strPortName);
 239     DWORD dwType = 0;
 240
 241     /* search the registry */
 242     if ((RegQueryValueEx(hDeviceKey, _T("PortName"), NULL, &dwType, reinterpret_cast<LPBYTE>(strPortName), &dwSize) == ERROR_SUCCESS) && (dwType == REG_SZ))
 243     {
 244       if (_tcslen(strPortName) > 3 && _tcsnicmp(strPortName, _T("COM"), 3) == 0 &&
 245         _ttoi(&(strPortName[3])) > 0)
 246       {
 247         cec_device foundDev;
 248         foundDev.path = devicedetailData->DevicePath;
 249         foundDev.comm = strPortName;
 250         deviceList.push_back(foundDev);
 251         ++iFound;
 252       }
 253     }
 254
 255     RegCloseKey(hDeviceKey);
 256   }
 257 #endif
 258
 259   return iFound;
 260 }