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 void CSerialSocket::Close(void)
  58 {
  59   if (IsOpen())
  60   {
  61     SocketClose(m_socket);
  62     #if !defined(__APPLE__) && !defined(__FreeBSD__)
  63     dev_unlock(m_strName.c_str(), m_lockPid);
  64     #endif
  65   }
  66 }
  67
  68 void CSerialSocket::Shutdown(void)
  69 {
  70   if (IsOpen())
  71   {
  72     SocketClose(m_socket);
  73     #if !defined(__APPLE__) && !defined(__FreeBSD__)
  74     dev_unlock(m_strName.c_str(), m_lockPid);
  75     #endif
  76   }
  77 }
  78
  79 ssize_t CSerialSocket::Write(void* data, size_t len)
  80 {
  81   return IsOpen() ? SocketWrite(m_socket, &m_iError, data, len) : -1;
  82 }
  83
  84 ssize_t CSerialSocket::Read(void* data, size_t len, uint64_t iTimeoutMs /* = 0 */)
  85 {
  86   return IsOpen() ? SocketRead(m_socket, &m_iError, data, len, iTimeoutMs) : -1;
  87 }
  88
  89 //setting all this stuff up is a pain in the ass
  90 bool CSerialSocket::Open(uint64_t iTimeoutMs /* = 0 */)
  91 {
  92   iTimeoutMs = 0;
  93   if (IsOpen())
  94   {
  95     m_iError = EINVAL;
  96     return false;
  97   }
  98
  99   if (m_iDatabits != SERIAL_DATA_BITS_FIVE && m_iDatabits != SERIAL_DATA_BITS_SIX &&
 100       m_iDatabits != SERIAL_DATA_BITS_SEVEN && m_iDatabits != SERIAL_DATA_BITS_EIGHT)
 101   {
 102     m_strError = "Databits has to be between 5 and 8";
 103     m_iError = EINVAL;
 104     return false;
 105   }
 106
 107   if (m_iStopbits != SERIAL_STOP_BITS_ONE && m_iStopbits != SERIAL_STOP_BITS_TWO)
 108   {
 109     m_strError = "Stopbits has to be 1 or 2";
 110     m_iError = EINVAL;
 111     return false;
 112   }
 113
 114   if (m_iParity != SERIAL_PARITY_NONE && m_iParity != SERIAL_PARITY_EVEN && m_iParity != SERIAL_PARITY_ODD)
 115   {
 116     m_strError = "Parity has to be none, even or odd";
 117     m_iError = EINVAL;
 118     return false;
 119   }
 120
 121   #if !defined(__APPLE__) && !defined(__FreeBSD__)
 122   m_lockPid = dev_lock(m_strName.c_str());
 123   if (m_lockPid != 0)
 124   {
 125     m_strError = "Couldn't lock the serial port";
 126     m_iError = EBUSY;
 127     return false;
 128   }
 129   #endif
 130
 131   m_socket = open(m_strName.c_str(), O_RDWR | O_NOCTTY | O_NDELAY);
 132
 133   if (m_socket == INVALID_SERIAL_SOCKET_VALUE)
 134   {
 135     m_strError = strerror(errno);
 136     #if !defined(__APPLE__) && !defined(__FreeBSD__)
 137     m_lockPid = dev_unlock(m_strName.c_str(), m_lockPid);
 138     #endif
 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     #if !defined(__APPLE__) && !defined(__FreeBSD__)
 186     m_lockPid = dev_unlock(m_strName.c_str(), m_lockPid);
 187     #endif
 188     return false;
 189   }
 190
 191   SocketSetBlocking(m_socket, true);
 192   m_bIsOpen = true;
 193
 194   return true;
 195 }
 196
 197 bool CSerialSocket::SetBaudRate(uint32_t baudrate)
 198 {
 199   int rate = IntToBaudrate(baudrate);
 200   if (rate == -1)
 201   {
 202     char buff[255];
 203     sprintf(buff, "%i is not a valid baudrate", baudrate);
 204     m_strError = buff;
 205     return false;
 206   }
 207
 208   //get the current port attributes
 209   if (tcgetattr(m_socket, &m_options) != 0)
 210   {
 211     m_strError = strerror(errno);
 212     return false;
 213   }
 214
 215   if (cfsetispeed(&m_options, rate) != 0)
 216   {
 217     m_strError = strerror(errno);
 218     return false;
 219   }
 220
 221   if (cfsetospeed(&m_options, rate) != 0)
 222   {
 223     m_strError = strerror(errno);
 224     return false;
 225   }
 226
 227   return true;
 228 }