src/lib/platform/posix/serialport.cpp

   1 /*
   2  * This file is part of the libCEC(R) library.
   3  *
   4  * libCEC(R) is Copyright (C) 2011-2012 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 "../os.h"
  34 #include <stdio.h>
  35 #include <fcntl.h>
  36 #include "../sockets/serialport.h"
  37 #include "../util/baudrate.h"
  38 #include "../posix/os-socket.h"
  39
  40 #if defined(__APPLE__) || defined(__FreeBSD__)
  41 #ifndef XCASE
  42 #define XCASE   0
  43 #endif
  44 #ifndef OLCUC
  45 #define OLCUC   0
  46 #endif
  47 #ifndef IUCLC
  48 #define IUCLC   0
  49 #endif
  50 #else
  51 #include <lockdev.h>
  52 #endif
  53
  54 using namespace std;
  55 using namespace PLATFORM;
  56
  57 inline bool RemoveLock(const char *strDeviceName)
  58 {
  59   #if !defined(__APPLE__) && !defined(__FreeBSD__)
  60   return dev_unlock(strDeviceName, 0) == 0;
  61   #endif
  62 }
  63
  64 void CSerialSocket::Close(void)
  65 {
  66   if (IsOpen())
  67   {
  68     SocketClose(m_socket);
  69     RemoveLock(m_strName.c_str());
  70   }
  71 }
  72
  73 void CSerialSocket::Shutdown(void)
  74 {
  75   if (IsOpen())
  76   {
  77     SocketClose(m_socket);
  78     RemoveLock(m_strName.c_str());
  79   }
  80 }
  81
  82 ssize_t CSerialSocket::Write(void* data, size_t len)
  83 {
  84   return IsOpen() ? SocketWrite(m_socket, &m_iError, data, len) : -1;
  85 }
  86
  87 ssize_t CSerialSocket::Read(void* data, size_t len, uint64_t iTimeoutMs /* = 0 */)
  88 {
  89   return IsOpen() ? SocketRead(m_socket, &m_iError, data, len, iTimeoutMs) : -1;
  90 }
  91
  92 //setting all this stuff up is a pain in the ass
  93 bool CSerialSocket::Open(uint64_t iTimeoutMs /* = 0 */)
  94 {
  95   iTimeoutMs = 0;
  96   if (IsOpen())
  97   {
  98     m_iError = EINVAL;
  99     return false;
 100   }
 101
 102   if (m_iDatabits != SERIAL_DATA_BITS_FIVE && m_iDatabits != SERIAL_DATA_BITS_SIX &&
 103       m_iDatabits != SERIAL_DATA_BITS_SEVEN && m_iDatabits != SERIAL_DATA_BITS_EIGHT)
 104   {
 105     m_strError = "Databits has to be between 5 and 8";
 106     m_iError = EINVAL;
 107     return false;
 108   }
 109
 110   if (m_iStopbits != SERIAL_STOP_BITS_ONE && m_iStopbits != SERIAL_STOP_BITS_TWO)
 111   {
 112     m_strError = "Stopbits has to be 1 or 2";
 113     m_iError = EINVAL;
 114     return false;
 115   }
 116
 117   if (m_iParity != SERIAL_PARITY_NONE && m_iParity != SERIAL_PARITY_EVEN && m_iParity != SERIAL_PARITY_ODD)
 118   {
 119     m_strError = "Parity has to be none, even or odd";
 120     m_iError = EINVAL;
 121     return false;
 122   }
 123
 124   #if !defined(__APPLE__) && !defined(__FreeBSD__)
 125   if (dev_lock(m_strName.c_str()) != 0)
 126   {
 127     m_strError = "Couldn't lock the serial port";
 128     m_iError = EBUSY;
 129     return false;
 130   }
 131   #endif
 132
 133   m_socket = open(m_strName.c_str(), O_RDWR | O_NOCTTY | O_NDELAY);
 134
 135   if (m_socket == INVALID_SERIAL_SOCKET_VALUE)
 136   {
 137     m_strError = strerror(errno);
 138     RemoveLock(m_strName.c_str());
 139     return false;
 140   }
 141
 142   SocketSetBlocking(m_socket, false);
 143
 144   if (!SetBaudRate(m_iBaudrate))
 145     return false;
 146
 147   m_options.c_cflag |= (CLOCAL | CREAD);
 148   m_options.c_cflag &= ~HUPCL;
 149
 150   m_options.c_cflag &= ~CSIZE;
 151   if (m_iDatabits == SERIAL_DATA_BITS_FIVE)  m_options.c_cflag |= CS5;
 152   if (m_iDatabits == SERIAL_DATA_BITS_SIX)   m_options.c_cflag |= CS6;
 153   if (m_iDatabits == SERIAL_DATA_BITS_SEVEN) m_options.c_cflag |= CS7;
 154   if (m_iDatabits == SERIAL_DATA_BITS_EIGHT) m_options.c_cflag |= CS8;
 155
 156   m_options.c_cflag &= ~PARENB;
 157   if (m_iParity == SERIAL_PARITY_EVEN || m_iParity == SERIAL_PARITY_ODD)
 158     m_options.c_cflag |= PARENB;
 159   if (m_iParity == SERIAL_PARITY_ODD)
 160     m_options.c_cflag |= PARODD;
 161
 162 #ifdef CRTSCTS
 163   m_options.c_cflag &= ~CRTSCTS;
 164 #elif defined(CNEW_RTSCTS)
 165   m_options.c_cflag &= ~CNEW_RTSCTS;
 166 #endif
 167
 168   if (m_iStopbits == SERIAL_STOP_BITS_ONE) m_options.c_cflag &= ~CSTOPB;
 169   else m_options.c_cflag |= CSTOPB;
 170
 171   //I guessed a little here
 172   m_options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG | XCASE | ECHOK | ECHONL | ECHOCTL | ECHOPRT | ECHOKE | TOSTOP);
 173
 174   if (m_iParity == SERIAL_PARITY_NONE)
 175     m_options.c_iflag &= ~INPCK;
 176   else
 177     m_options.c_iflag |= INPCK | ISTRIP;
 178
 179   m_options.c_iflag &= ~(IXON | IXOFF | IXANY | BRKINT | INLCR | IGNCR | ICRNL | IUCLC | IMAXBEL);
 180   m_options.c_oflag &= ~(OPOST | ONLCR | OCRNL);
 181
 182   if (tcsetattr(m_socket, TCSANOW, &m_options) != 0)
 183   {
 184     m_strError = strerror(errno);
 185     RemoveLock(m_strName.c_str());
 186     return false;
 187   }
 188
 189   SocketSetBlocking(m_socket, true);
 190   m_bIsOpen = true;
 191
 192   return true;
 193 }
 194
 195 bool CSerialSocket::SetBaudRate(uint32_t baudrate)
 196 {
 197   int rate = IntToBaudrate(baudrate);
 198   if (rate == -1)
 199   {
 200     char buff[255];
 201     sprintf(buff, "%i is not a valid baudrate", baudrate);
 202     m_strError = buff;
 203     return false;
 204   }
 205
 206   //get the current port attributes
 207   if (tcgetattr(m_socket, &m_options) != 0)
 208   {
 209     m_strError = strerror(errno);
 210     return false;
 211   }
 212
 213   if (cfsetispeed(&m_options, rate) != 0)
 214   {
 215     m_strError = strerror(errno);
 216     return false;
 217   }
 218
 219   if (cfsetospeed(&m_options, rate) != 0)
 220   {
 221     m_strError = strerror(errno);
 222     return false;
 223   }
 224
 225   return true;
 226 }