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// Copyright 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/extensions/api/serial/serial_connection.h"
#include <sys/ioctl.h>
#include <termios.h>
#if defined(OS_LINUX)
#include <linux/serial.h>
#endif
namespace extensions {
namespace {
// Convert an integral bit rate to a nominal one. Returns |true|
// if the conversion was successful and |false| otherwise.
bool BitrateToSpeedConstant(int bitrate, speed_t* speed) {
#define BITRATE_TO_SPEED_CASE(x) case x: *speed = B ## x; return true;
switch (bitrate) {
BITRATE_TO_SPEED_CASE(0)
BITRATE_TO_SPEED_CASE(50)
BITRATE_TO_SPEED_CASE(75)
BITRATE_TO_SPEED_CASE(110)
BITRATE_TO_SPEED_CASE(134)
BITRATE_TO_SPEED_CASE(150)
BITRATE_TO_SPEED_CASE(200)
BITRATE_TO_SPEED_CASE(300)
BITRATE_TO_SPEED_CASE(600)
BITRATE_TO_SPEED_CASE(1200)
BITRATE_TO_SPEED_CASE(1800)
BITRATE_TO_SPEED_CASE(2400)
BITRATE_TO_SPEED_CASE(4800)
BITRATE_TO_SPEED_CASE(9600)
BITRATE_TO_SPEED_CASE(19200)
BITRATE_TO_SPEED_CASE(38400)
#if defined(OS_POSIX) && !defined(OS_MACOSX)
BITRATE_TO_SPEED_CASE(57600)
BITRATE_TO_SPEED_CASE(115200)
BITRATE_TO_SPEED_CASE(230400)
BITRATE_TO_SPEED_CASE(460800)
BITRATE_TO_SPEED_CASE(576000)
BITRATE_TO_SPEED_CASE(921600)
#endif
default:
return false;
}
#undef BITRATE_TO_SPEED_CASE
}
// Convert a known nominal speed into an integral bitrate. Returns |true|
// if the conversion was successful and |false| otherwise.
bool SpeedConstantToBitrate(speed_t speed, int* bitrate) {
#define SPEED_TO_BITRATE_CASE(x) case B ## x: *bitrate = x; return true;
switch (speed) {
SPEED_TO_BITRATE_CASE(0)
SPEED_TO_BITRATE_CASE(50)
SPEED_TO_BITRATE_CASE(75)
SPEED_TO_BITRATE_CASE(110)
SPEED_TO_BITRATE_CASE(134)
SPEED_TO_BITRATE_CASE(150)
SPEED_TO_BITRATE_CASE(200)
SPEED_TO_BITRATE_CASE(300)
SPEED_TO_BITRATE_CASE(600)
SPEED_TO_BITRATE_CASE(1200)
SPEED_TO_BITRATE_CASE(1800)
SPEED_TO_BITRATE_CASE(2400)
SPEED_TO_BITRATE_CASE(4800)
SPEED_TO_BITRATE_CASE(9600)
SPEED_TO_BITRATE_CASE(19200)
SPEED_TO_BITRATE_CASE(38400)
#if defined(OS_POSIX) && !defined(OS_MACOSX)
SPEED_TO_BITRATE_CASE(57600)
SPEED_TO_BITRATE_CASE(115200)
SPEED_TO_BITRATE_CASE(230400)
SPEED_TO_BITRATE_CASE(460800)
SPEED_TO_BITRATE_CASE(576000)
SPEED_TO_BITRATE_CASE(921600)
#endif
default:
return false;
}
#undef SPEED_TO_BITRATE_CASE
}
bool SetCustomBitrate(base::PlatformFile file,
struct termios* config,
int bitrate) {
#if defined(OS_LINUX)
struct serial_struct serial;
if (ioctl(file, TIOCGSERIAL, &serial) < 0) {
return false;
}
serial.flags = (serial.flags & ~ASYNC_SPD_MASK) | ASYNC_SPD_CUST;
serial.custom_divisor = serial.baud_base / bitrate;
if (serial.custom_divisor < 1) {
serial.custom_divisor = 1;
}
cfsetispeed(config, B38400);
cfsetospeed(config, B38400);
return ioctl(file, TIOCSSERIAL, &serial) >= 0;
#elif defined(OS_MACOSX)
speed_t speed = static_cast<speed_t>(bitrate);
cfsetispeed(config, speed);
cfsetospeed(config, speed);
return true;
#else
return false;
#endif
}
} // namespace
bool SerialConnection::ConfigurePort(
const api::serial::ConnectionOptions& options) {
struct termios config;
tcgetattr(file_.GetPlatformFile(), &config);
if (options.bitrate.get()) {
if (*options.bitrate >= 0) {
speed_t bitrate_opt = B0;
if (BitrateToSpeedConstant(*options.bitrate, &bitrate_opt)) {
cfsetispeed(&config, bitrate_opt);
cfsetospeed(&config, bitrate_opt);
} else {
// Attempt to set a custom speed.
if (!SetCustomBitrate(file_.GetPlatformFile(), &config,
*options.bitrate)) {
return false;
}
}
}
}
if (options.data_bits != api::serial::DATA_BITS_NONE) {
config.c_cflag &= ~CSIZE;
switch (options.data_bits) {
case api::serial::DATA_BITS_SEVEN:
config.c_cflag |= CS7;
break;
case api::serial::DATA_BITS_EIGHT:
default:
config.c_cflag |= CS8;
break;
}
}
if (options.parity_bit != api::serial::PARITY_BIT_NONE) {
switch (options.parity_bit) {
case api::serial::PARITY_BIT_EVEN:
config.c_cflag |= PARENB;
config.c_cflag &= ~PARODD;
break;
case api::serial::PARITY_BIT_ODD:
config.c_cflag |= (PARODD | PARENB);
break;
case api::serial::PARITY_BIT_NO:
default:
config.c_cflag &= ~(PARODD | PARENB);
break;
}
}
if (options.stop_bits != api::serial::STOP_BITS_NONE) {
switch (options.stop_bits) {
case api::serial::STOP_BITS_TWO:
config.c_cflag |= CSTOPB;
break;
case api::serial::STOP_BITS_ONE:
default:
config.c_cflag &= ~CSTOPB;
break;
}
}
if (options.cts_flow_control.get()) {
if (*options.cts_flow_control){
config.c_cflag |= CRTSCTS;
} else {
config.c_cflag &= ~CRTSCTS;
}
}
return tcsetattr(file_.GetPlatformFile(), TCSANOW, &config) == 0;
}
bool SerialConnection::PostOpen() {
struct termios config;
tcgetattr(file_.GetPlatformFile(), &config);
// Set flags for 'raw' operation
config.c_lflag &= ~(ICANON | ECHO | ECHOE | ECHONL | ISIG);
config.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR |
ICRNL | IXON);
config.c_oflag &= ~OPOST;
// CLOCAL causes the system to disregard the DCD signal state.
// CREAD enables reading from the port.
config.c_cflag |= (CLOCAL | CREAD);
return tcsetattr(file_.GetPlatformFile(), TCSANOW, &config) == 0;
}
bool SerialConnection::Flush() const {
return tcflush(file_.GetPlatformFile(), TCIOFLUSH) == 0;
}
bool SerialConnection::GetControlSignals(
api::serial::DeviceControlSignals* signals) const {
int status;
if (ioctl(file_.GetPlatformFile(), TIOCMGET, &status) == -1) {
return false;
}
signals->dcd = (status & TIOCM_CAR) != 0;
signals->cts = (status & TIOCM_CTS) != 0;
signals->dsr = (status & TIOCM_DSR) != 0;
signals->ri = (status & TIOCM_RI) != 0;
return true;
}
bool SerialConnection::SetControlSignals(
const api::serial::HostControlSignals& signals) {
int status;
if (ioctl(file_.GetPlatformFile(), TIOCMGET, &status) == -1) {
return false;
}
if (signals.dtr.get()) {
if (*signals.dtr) {
status |= TIOCM_DTR;
} else {
status &= ~TIOCM_DTR;
}
}
if (signals.rts.get()) {
if (*signals.rts){
status |= TIOCM_RTS;
} else{
status &= ~TIOCM_RTS;
}
}
return ioctl(file_.GetPlatformFile(), TIOCMSET, &status) == 0;
}
bool SerialConnection::GetPortInfo(api::serial::ConnectionInfo* info) const {
struct termios config;
if (tcgetattr(file_.GetPlatformFile(), &config) == -1) {
return false;
}
speed_t ispeed = cfgetispeed(&config);
speed_t ospeed = cfgetospeed(&config);
if (ispeed == ospeed) {
int bitrate = 0;
if (SpeedConstantToBitrate(ispeed, &bitrate)) {
info->bitrate.reset(new int(bitrate));
} else if (ispeed > 0) {
info->bitrate.reset(new int(static_cast<int>(ispeed)));
}
}
if ((config.c_cflag & CSIZE) == CS7) {
info->data_bits = api::serial::DATA_BITS_SEVEN;
} else if ((config.c_cflag & CSIZE) == CS8) {
info->data_bits = api::serial::DATA_BITS_EIGHT;
} else {
info->data_bits = api::serial::DATA_BITS_NONE;
}
if (config.c_cflag & PARENB) {
info->parity_bit = (config.c_cflag & PARODD) ? api::serial::PARITY_BIT_ODD
: api::serial::PARITY_BIT_EVEN;
} else {
info->parity_bit = api::serial::PARITY_BIT_NO;
}
info->stop_bits = (config.c_cflag & CSTOPB) ? api::serial::STOP_BITS_TWO
: api::serial::STOP_BITS_ONE;
info->cts_flow_control.reset(new bool((config.c_cflag & CRTSCTS) != 0));
return true;
}
std::string SerialConnection::MaybeFixUpPortName(
const std::string &port_name) {
return port_name;
}
} // namespace extensions
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