Merge PR #29
[deb_libcec.git] / src / lib / platform / posix / serialport.cpp
1 /*
2 * This file is part of the libCEC(R) library.
3 *
4 * libCEC(R) is Copyright (C) 2011-2013 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 "env.h"
34 #include <stdio.h>
35 #include <fcntl.h>
36 #include "lib/platform/sockets/serialport.h"
37 #include "lib/platform/util/baudrate.h"
38 #include "lib/platform/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 #ifdef HAVE_LOCKDEV
52 #include <lockdev.h>
53 #endif
54 #endif
55
56 using namespace std;
57 using namespace PLATFORM;
58
59 inline bool RemoveLock(const char *strDeviceName)
60 {
61 #if !defined(__APPLE__) && !defined(__FreeBSD__) && defined(HAVE_LOCKDEV)
62 return dev_unlock(strDeviceName, 0) == 0;
63 #else
64 (void)strDeviceName; // silence unused warning
65 return true;
66 #endif
67 }
68
69 void CSerialSocket::Close(void)
70 {
71 if (IsOpen())
72 {
73 SocketClose(m_socket);
74 RemoveLock(m_strName.c_str());
75 }
76 }
77
78 void CSerialSocket::Shutdown(void)
79 {
80 if (IsOpen())
81 {
82 SocketClose(m_socket);
83 RemoveLock(m_strName.c_str());
84 }
85 }
86
87 ssize_t CSerialSocket::Write(void* data, size_t len)
88 {
89 return IsOpen() ? SocketWrite(m_socket, &m_iError, data, len) : -1;
90 }
91
92 ssize_t CSerialSocket::Read(void* data, size_t len, uint64_t iTimeoutMs /* = 0 */)
93 {
94 return IsOpen() ? SocketRead(m_socket, &m_iError, data, len, iTimeoutMs) : -1;
95 }
96
97 //setting all this stuff up is a pain in the ass
98 bool CSerialSocket::Open(uint64_t iTimeoutMs /* = 0 */)
99 {
100 iTimeoutMs = 0; if (!iTimeoutMs){} // silence unused warning
101 if (IsOpen())
102 {
103 m_iError = EINVAL;
104 return false;
105 }
106
107 if (m_iDatabits != SERIAL_DATA_BITS_FIVE && m_iDatabits != SERIAL_DATA_BITS_SIX &&
108 m_iDatabits != SERIAL_DATA_BITS_SEVEN && m_iDatabits != SERIAL_DATA_BITS_EIGHT)
109 {
110 m_strError = "Databits has to be between 5 and 8";
111 m_iError = EINVAL;
112 return false;
113 }
114
115 if (m_iStopbits != SERIAL_STOP_BITS_ONE && m_iStopbits != SERIAL_STOP_BITS_TWO)
116 {
117 m_strError = "Stopbits has to be 1 or 2";
118 m_iError = EINVAL;
119 return false;
120 }
121
122 if (m_iParity != SERIAL_PARITY_NONE && m_iParity != SERIAL_PARITY_EVEN && m_iParity != SERIAL_PARITY_ODD)
123 {
124 m_strError = "Parity has to be none, even or odd";
125 m_iError = EINVAL;
126 return false;
127 }
128
129 #if !defined(__APPLE__) && !defined(__FreeBSD__) && defined(HAVE_LOCKDEV)
130 if (dev_lock(m_strName.c_str()) != 0)
131 {
132 m_strError = "Couldn't lock the serial port";
133 m_iError = EBUSY;
134 return false;
135 }
136 #endif
137
138 m_socket = open(m_strName.c_str(), O_RDWR | O_NOCTTY | O_NDELAY);
139
140 if (m_socket == INVALID_SERIAL_SOCKET_VALUE)
141 {
142 m_strError = strerror(errno);
143 RemoveLock(m_strName.c_str());
144 return false;
145 }
146
147 SocketSetBlocking(m_socket, false);
148
149 if (!SetBaudRate(m_iBaudrate))
150 return false;
151
152 m_options.c_cflag |= (CLOCAL | CREAD);
153 m_options.c_cflag &= ~HUPCL;
154
155 m_options.c_cflag &= ~CSIZE;
156 if (m_iDatabits == SERIAL_DATA_BITS_FIVE) m_options.c_cflag |= CS5;
157 if (m_iDatabits == SERIAL_DATA_BITS_SIX) m_options.c_cflag |= CS6;
158 if (m_iDatabits == SERIAL_DATA_BITS_SEVEN) m_options.c_cflag |= CS7;
159 if (m_iDatabits == SERIAL_DATA_BITS_EIGHT) m_options.c_cflag |= CS8;
160
161 m_options.c_cflag &= ~PARENB;
162 if (m_iParity == SERIAL_PARITY_EVEN || m_iParity == SERIAL_PARITY_ODD)
163 m_options.c_cflag |= PARENB;
164 if (m_iParity == SERIAL_PARITY_ODD)
165 m_options.c_cflag |= PARODD;
166
167 #ifdef CRTSCTS
168 m_options.c_cflag &= ~CRTSCTS;
169 #elif defined(CNEW_RTSCTS)
170 m_options.c_cflag &= ~CNEW_RTSCTS;
171 #endif
172
173 if (m_iStopbits == SERIAL_STOP_BITS_ONE) m_options.c_cflag &= ~CSTOPB;
174 else m_options.c_cflag |= CSTOPB;
175
176 //I guessed a little here
177 m_options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG | XCASE | ECHOK | ECHONL | ECHOCTL | ECHOPRT | ECHOKE | TOSTOP);
178
179 if (m_iParity == SERIAL_PARITY_NONE)
180 m_options.c_iflag &= ~INPCK;
181 else
182 m_options.c_iflag |= INPCK | ISTRIP;
183
184 m_options.c_iflag &= ~(IXON | IXOFF | IXANY | BRKINT | INLCR | IGNCR | ICRNL | IUCLC | IMAXBEL);
185 m_options.c_oflag &= ~(OPOST | ONLCR | OCRNL);
186
187 if (tcsetattr(m_socket, TCSANOW, &m_options) != 0)
188 {
189 m_strError = strerror(errno);
190 RemoveLock(m_strName.c_str());
191 return false;
192 }
193
194 SocketSetBlocking(m_socket, true);
195 m_bIsOpen = true;
196
197 return true;
198 }
199
200 bool CSerialSocket::SetBaudRate(uint32_t baudrate)
201 {
202 int rate = IntToBaudrate(baudrate);
203 if (rate == -1)
204 {
205 char buff[255];
206 sprintf(buff, "%i is not a valid baudrate", baudrate);
207 m_strError = buff;
208 return false;
209 }
210
211 //get the current port attributes
212 if (tcgetattr(m_socket, &m_options) != 0)
213 {
214 m_strError = strerror(errno);
215 return false;
216 }
217
218 if (cfsetispeed(&m_options, rate) != 0)
219 {
220 m_strError = strerror(errno);
221 return false;
222 }
223
224 if (cfsetospeed(&m_options, rate) != 0)
225 {
226 m_strError = strerror(errno);
227 return false;
228 }
229
230 return true;
231 }