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/*
* BRLTTY - A background process providing access to the console screen (when in
* text mode) for a blind person using a refreshable braille display.
*
* Copyright (C) 1995-2018 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU Lesser General Public License, as published by the Free Software
* Foundation; either version 2.1 of the License, or (at your option) any
* later version. Please see the file LICENSE-LGPL for details.
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*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#include "prologue.h"
#include <string.h>
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "log.h"
#include "io_misc.h"
#include "serial_termios.h"
#include "serial_internal.h"
BEGIN_SERIAL_BAUD_TABLE
#ifdef B50
{50, B50},
#endif /* B50 */
#ifdef B75
{75, B75},
#endif /* B75 */
#ifdef B110
{110, B110},
#endif /* B110 */
#ifdef B134
{134, B134},
#endif /* B134 */
#ifdef B150
{150, B150},
#endif /* B150 */
#ifdef B200
{200, B200},
#endif /* B200 */
#ifdef B300
{300, B300},
#endif /* B300 */
#ifdef B600
{600, B600},
#endif /* B600 */
#ifdef B1200
{1200, B1200},
#endif /* B1200 */
#ifdef B1800
{1800, B1800},
#endif /* B1800 */
#ifdef B2400
{2400, B2400},
#endif /* B2400 */
#ifdef B4800
{4800, B4800},
#endif /* B4800 */
#ifdef B9600
{9600, B9600},
#endif /* B9600 */
#ifdef B19200
{19200, B19200},
#endif /* B19200 */
#ifdef B38400
{38400, B38400},
#endif /* B38400 */
#ifdef B57600
{57600, B57600},
#endif /* B57600 */
#ifdef B115200
{115200, B115200},
#endif /* B115200 */
#ifdef B230400
{230400, B230400},
#endif /* B230400 */
#ifdef B460800
{460800, B460800},
#endif /* B460800 */
#ifdef B500000
{500000, B500000},
#endif /* B500000 */
#ifdef B576000
{576000, B576000},
#endif /* B576000 */
#ifdef B921600
{921600, B921600},
#endif /* B921600 */
#ifdef B1000000
{1000000, B1000000},
#endif /* B1000000 */
#ifdef B1152000
{1152000, B1152000},
#endif /* B1152000 */
#ifdef B1500000
{1500000, B1500000},
#endif /* B1500000 */
#ifdef B2000000
{2000000, B2000000},
#endif /* B2000000 */
#ifdef B2500000
{2500000, B2500000},
#endif /* B2500000 */
#ifdef B3000000
{3000000, B3000000},
#endif /* B3000000 */
#ifdef B3500000
{3500000, B3500000},
#endif /* B3500000 */
#ifdef B4000000
{4000000, B4000000},
#endif /* B4000000 */
END_SERIAL_BAUD_TABLE
void
serialPutInitialAttributes (SerialAttributes *attributes) {
attributes->c_cflag = CREAD;
attributes->c_iflag = IGNPAR | IGNBRK;
#ifdef IEXTEN
attributes->c_lflag |= IEXTEN;
#endif /* IEXTEN */
#ifdef _POSIX_VDISABLE
if (_POSIX_VDISABLE) {
unsigned int i;
for (i=0; i<NCCS; i+=1) {
if (i == VTIME) continue;
if (i == VMIN) continue;
attributes->c_cc[i] = _POSIX_VDISABLE;
}
}
#endif /* _POSIX_VDISABLE */
}
int
serialPutSpeed (SerialAttributes *attributes, SerialSpeed speed) {
if (cfsetospeed(attributes, speed) != -1) {
if (cfsetispeed(attributes, speed) != -1) {
return 1;
} else {
logSystemError("cfsetispeed");
}
} else {
logSystemError("cfsetospeed");
}
return 0;
}
int
serialPutDataBits (SerialAttributes *attributes, unsigned int bits) {
tcflag_t size;
switch (bits) {
#ifdef CS5
case 5: size = CS5; break;
#endif /* CS5 */
#ifdef CS6
case 6: size = CS6; break;
#endif /* CS6 */
#ifdef CS7
case 7: size = CS7; break;
#endif /* CS7 */
#ifdef CS8
case 8: size = CS8; break;
#endif /* CS8 */
default:
return 0;
}
attributes->c_cflag &= ~CSIZE;
attributes->c_cflag |= size;
return 1;
}
int
serialPutStopBits (SerialAttributes *attributes, SerialStopBits bits) {
if (bits == SERIAL_STOP_1) {
attributes->c_cflag &= ~CSTOPB;
} else if (bits == SERIAL_STOP_2) {
attributes->c_cflag |= CSTOPB;
} else {
return 0;
}
return 1;
}
int
serialPutParity (SerialAttributes *attributes, SerialParity parity) {
attributes->c_cflag &= ~(PARENB | PARODD);
#ifdef PARSTK
attributes->c_cflag &= ~PARSTK;
#endif /* PARSTK */
if (parity != SERIAL_PARITY_NONE) {
if (parity == SERIAL_PARITY_ODD) {
attributes->c_cflag |= PARODD;
} else
#ifndef PARSTK
#ifdef CMSPAR
#define PARSTK CMSPAR
#endif /* CMSPAR */
#endif /* PARSTK */
#ifdef PARSTK
if (parity == SERIAL_PARITY_SPACE) {
attributes->c_cflag |= PARSTK;
} else
if (parity == SERIAL_PARITY_MARK) {
attributes->c_cflag |= PARSTK | PARODD;
} else
#endif /* PARSTK */
if (parity != SERIAL_PARITY_EVEN) {
return 0;
}
attributes->c_cflag |= PARENB;
}
return 1;
}
SerialFlowControl
serialPutFlowControl (SerialAttributes *attributes, SerialFlowControl flow) {
typedef struct {
tcflag_t *field;
tcflag_t flag;
SerialFlowControl flow;
} FlowControlEntry;
const FlowControlEntry flowControlTable[] = {
#ifdef CRTSCTS
{&attributes->c_cflag, CRTSCTS, SERIAL_FLOW_OUTPUT_RTS | SERIAL_FLOW_OUTPUT_CTS},
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#endif /* CRTSCTS */
#ifdef IHFLOW
{&attributes->c_cflag, IHFLOW, SERIAL_FLOW_INPUT_RTS},
#endif /* IHFLOW */
#ifdef OHFLOW
{&attributes->c_cflag, OHFLOW, SERIAL_FLOW_OUTPUT_CTS},
#endif /* OHFLOW */
#ifdef IXOFF
{&attributes->c_iflag, IXOFF, SERIAL_FLOW_INPUT_XON},
#endif /* IXOFF */
#ifdef IXON
{&attributes->c_iflag, IXON, SERIAL_FLOW_OUTPUT_XON},
#endif /* IXON */
{NULL, 0, 0}
};
const FlowControlEntry *entry = flowControlTable;
while (entry->field) {
if ((flow & entry->flow) == entry->flow) {
flow &= ~entry->flow;
*entry->field |= entry->flag;
} else if (!(flow & entry->flow)) {
*entry->field &= ~entry->flag;
}
entry += 1;
}
return flow;
}
int
serialPutModemState (SerialAttributes *attributes, int enabled) {
if (enabled) {
attributes->c_cflag &= ~CLOCAL;
} else {
attributes->c_cflag |= CLOCAL;
}
return 1;
}
unsigned int
serialGetDataBits (const SerialAttributes *attributes) {
tcflag_t size = attributes->c_cflag & CSIZE;
switch (size) {
#ifdef CS5
case CS5: return 5;
#endif /* CS5 */
#ifdef CS6
case CS6: return 6;
#endif /* CS6 */
#ifdef CS7
case CS7: return 7;
#endif /* CS7 */
#ifdef CS8
case CS8: return 8;
#endif /* CS8 */
default:
logMessage(LOG_WARNING, "unsupported serial data bits value: %lX", (unsigned long)size);
return 0;
}
}
unsigned int
serialGetStopBits (const SerialAttributes *attributes) {
return (attributes->c_cflag & CSTOPB)? 2: 1;
}
unsigned int
serialGetParityBits (const SerialAttributes *attributes) {
return (attributes->c_cflag & PARENB)? 1: 0;
}
int
serialGetAttributes (SerialDevice *serial, SerialAttributes *attributes) {
if (tcgetattr(serial->fileDescriptor, attributes) != -1) return 1;
logSystemError("tcgetattr");
return 0;
}
int
serialPutAttributes (SerialDevice *serial, const SerialAttributes *attributes) {
if (tcsetattr(serial->fileDescriptor, TCSANOW, attributes) != -1) return 1;
logSystemError("tcsetattr");
return 0;
}
int
serialCancelInput (SerialDevice *serial) {
if (tcflush(serial->fileDescriptor, TCIFLUSH) != -1) return 1;
if (errno == EINVAL) return 1;
logSystemError("TCIFLUSH");
return 0;
}
int
serialCancelOutput (SerialDevice *serial) {
if (tcflush(serial->fileDescriptor, TCOFLUSH) != -1) return 1;
if (errno == EINVAL) return 1;
logSystemError("TCOFLUSH");
return 0;
}
static void
serialCancelInputMonitor (SerialDevice *serial) {
if (serial->package.inputMonitor) {
asyncCancelRequest(serial->package.inputMonitor);
serial->package.inputMonitor = NULL;
}
}
int
serialMonitorInput (SerialDevice *serial, AsyncMonitorCallback *callback, void *data) {
serialCancelInputMonitor(serial);
if (!callback) return 1;
return asyncMonitorFileInput(&serial->package.inputMonitor, serial->fileDescriptor, callback, data);
}
int
serialPollInput (SerialDevice *serial, int timeout) {
return awaitFileInput(serial->fileDescriptor, timeout);
}
int
serialDrainOutput (SerialDevice *serial) {
#ifdef HAVE_TCDRAIN
do {
if (tcdrain(serial->fileDescriptor) != -1) return 1;
} while (errno == EINTR);
#else /* HAVE_TCDRAIN */
errno = ENOSYS;
#endif /* HAVE_TCDRAIN */
logSystemError("tcdrain");
return 0;
}
ssize_t
serialGetData (
SerialDevice *serial,
void *buffer, size_t size,
int initialTimeout, int subsequentTimeout
) {
return readFile(serial->fileDescriptor, buffer, size, initialTimeout, subsequentTimeout);
}
ssize_t
serialPutData (
SerialDevice *serial,
const void *data, size_t size
) {
return writeFile(serial->fileDescriptor, data, size);
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}
int
serialGetLines (SerialDevice *serial) {
#ifdef TIOCMGET
if (ioctl(serial->fileDescriptor, TIOCMGET, &serial->linesState) == -1) {
logSystemError("TIOCMGET");
return 0;
}
#else /* TIOCMGET */
#warning getting modem lines not supported on this platform
serial->linesState = SERIAL_LINE_RTS | SERIAL_LINE_CTS | SERIAL_LINE_DTR | SERIAL_LINE_DSR | SERIAL_LINE_CAR;
#endif /* TIOCMGET */
return 1;
}
int
serialPutLines (SerialDevice *serial, SerialLines high, SerialLines low) {
#ifdef TIOCMSET
if (serialGetLines(serial)) {
SerialLines lines = serial->linesState;
lines |= high;
lines &= ~low;
if (ioctl(serial->fileDescriptor, TIOCMSET, &lines) != -1) return 1;
logSystemError("TIOCMSET");
}
#else /* TIOCMSET */
#warning setting modem lines not supported on this platform
#endif /* TIOCMSET */
return 0;
}
int
serialRegisterWaitLines (SerialDevice *serial, SerialLines lines) {
return 1;
}
int
serialMonitorWaitLines (SerialDevice *serial) {
#ifdef TIOCMIWAIT
if (ioctl(serial->fileDescriptor, TIOCMIWAIT, serial->waitLines) != -1) return 1;
logSystemError("TIOCMIWAIT");
#else /* TIOCMIWAIT */
SerialLines old = serial->linesState & serial->waitLines;
while (serialGetLines(serial)) {
if ((serial->linesState & serial->waitLines) != old) return 1;
}
#endif /* TIOCMIWAIT */
return 0;
}
int
serialConnectDevice (SerialDevice *serial, const char *device) {
if ((serial->fileDescriptor = open(device, O_RDWR|O_NOCTTY|O_NONBLOCK)) != -1) {
if (isatty(serial->fileDescriptor)) {
if (serialPrepareDevice(serial)) {
logMessage(LOG_CATEGORY(SERIAL_IO), "device opened: %s: fd=%d",
device, serial->fileDescriptor);
return 1;
}
} else {
logMessage(LOG_ERR, "not a serial device: %s", device);
}
close(serial->fileDescriptor);
} else {
logMessage(((errno == ENOENT)? LOG_DEBUG: LOG_ERR),
"cannot open serial device: %s: %s",
device, strerror(errno));
}
return 0;
}
void
serialDisconnectDevice (SerialDevice *serial) {
serialCancelInputMonitor(serial);