+/**
+ * Open the specified serial port.
+ *
+ * @param serial Previously initialized serial port structure.
+ * @param flags Flags to use when opening the serial port.
+ * TODO: Abstract 'flags', currently they're OS-specific!
+ *
+ * If the serial structure contains a serialcomm string, it will be
+ * passed to serial_set_paramstr() after the port is opened.
+ *
+ * @return SR_OK on success, SR_ERR on failure.
+ */
+SR_PRIV int serial_open(struct sr_serial_dev_inst *serial, int flags)
+{
+
+ if (!serial) {
+ sr_dbg("Invalid serial port.");
+ return SR_ERR;
+ }
+
+ sr_spew("Opening serial port '%s' (flags %d).", serial->port, flags);
+
+#ifdef _WIN32
+ hdl = CreateFile(serial->port, GENERIC_READ | GENERIC_WRITE, 0, 0,
+ OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
+ if (hdl == INVALID_HANDLE_VALUE) {
+ sr_err("Error opening serial port '%s'.", serial->port);
+ return SR_ERR;
+ }
+#else
+ if ((serial->fd = open(serial->port, flags)) < 0) {
+ sr_err("Error opening serial port '%s': %s.", serial->port,
+ strerror(errno));
+ return SR_ERR;
+ } else
+ sr_spew("Opened serial port '%s' (fd %d).", serial->port, serial->fd);
+#endif
+
+ if (serial->serialcomm)
+ return serial_set_paramstr(serial, serial->serialcomm);
+ else
+ return SR_OK;
+}
+
+/**
+ * Close the specified serial port.
+ *
+ * @param serial Previously initialized serial port structure.
+ *
+ * @return SR_OK on success, SR_ERR on failure.
+ */
+SR_PRIV int serial_close(struct sr_serial_dev_inst *serial)
+{
+ int ret;
+
+ if (!serial) {
+ sr_dbg("Invalid serial port.");
+ return SR_ERR;
+ }
+
+ if (serial->fd == -1) {
+ sr_dbg("Cannot close unopened serial port %s (fd %d).",
+ serial->port, serial->fd);
+ return SR_ERR;
+ }
+
+ sr_spew("Closing serial port %s (fd %d).", serial->port, serial->fd);
+ ret = SR_OK;
+
+#ifdef _WIN32
+ /* Returns non-zero upon success, 0 upon failure. */
+ if (CloseHandle(hdl) == 0)
+ ret = SR_ERR;
+#else
+ /* Returns 0 upon success, -1 upon failure. */
+ if (close(serial->fd) < 0) {
+ sr_err("Error closing serial port: %s (fd %d).", strerror(errno),
+ serial->fd);
+ ret = SR_ERR;
+ }
+#endif
+
+ serial->fd = -1;
+
+ return ret;
+}
+
+/**
+ * Flush serial port buffers.
+ *
+ * @param serial Previously initialized serial port structure.
+ *
+ * @return SR_OK on success, SR_ERR on failure.
+ */
+SR_PRIV int serial_flush(struct sr_serial_dev_inst *serial)
+{
+ int ret;
+
+ if (!serial) {
+ sr_dbg("Invalid serial port.");
+ return SR_ERR;
+ }
+
+ if (serial->fd == -1) {
+ sr_dbg("Cannot flush unopened serial port %s (fd %d).",
+ serial->port, serial->fd);
+ return SR_ERR;
+ }
+
+ sr_spew("Flushing serial port %s (fd %d).", serial->port, serial->fd);
+ ret = SR_OK;
+
+#ifdef _WIN32
+ /* Returns non-zero upon success, 0 upon failure. */
+ if (PurgeComm(hdl, PURGE_RXCLEAR | PURGE_TXCLEAR) == 0) {
+ sr_err("Error flushing serial port: %s.", strerror(errno));
+ ret = SR_ERR;
+ }
+#else
+ /* Returns 0 upon success, -1 upon failure. */
+ if (tcflush(serial->fd, TCIOFLUSH) < 0) {
+ sr_err("Error flushing serial port: %s.", strerror(errno));
+ ret = SR_ERR;
+ }
+
+ return ret;
+#endif
+}
+
+/**
+ * Write a number of bytes to the specified serial port.
+ *
+ * @param serial Previously initialized serial port structure.
+ * @param buf Buffer containing the bytes to write.
+ * @param count Number of bytes to write.
+ *
+ * @return The number of bytes written, or -1 upon failure.
+ */
+SR_PRIV int serial_write(struct sr_serial_dev_inst *serial,
+ const void *buf, size_t count)
+{
+ ssize_t ret;
+
+ if (!serial) {
+ sr_dbg("Invalid serial port.");
+ return -1;
+ }
+
+ if (serial->fd == -1) {
+ sr_dbg("Cannot use unopened serial port %s (fd %d).",
+ serial->port, serial->fd);
+ return -1;
+ }
+
+#ifdef _WIN32
+ DWORD tmp = 0;
+
+ /* FIXME */
+ /* Returns non-zero upon success, 0 upon failure. */
+ WriteFile(hdl, buf, count, &tmp, NULL);
+#else
+ /* Returns the number of bytes written, or -1 upon failure. */
+ ret = write(serial->fd, buf, count);
+ if (ret < 0)
+ sr_err("Write error: %s.", strerror(errno));
+ else
+ sr_spew("Wrote %d/%d bytes (fd %d).", ret, count, serial->fd);
+#endif
+
+ return ret;
+}
+
+/**
+ * Read a number of bytes from the specified serial port.
+ *
+ * @param serial Previously initialized serial port structure.
+ * @param buf Buffer where to store the bytes that are read.
+ * @param count The number of bytes to read.
+ *
+ * @return The number of bytes read, or -1 upon failure.
+ */
+SR_PRIV int serial_read(struct sr_serial_dev_inst *serial, void *buf,
+ size_t count)
+{
+ ssize_t ret;
+
+ if (!serial) {
+ sr_dbg("Invalid serial port.");
+ return -1;
+ }
+
+ if (serial->fd == -1) {
+ sr_dbg("Cannot use unopened serial port %s (fd %d).",
+ serial->port, serial->fd);
+ return -1;
+ }
+
+#ifdef _WIN32
+ DWORD tmp = 0;
+
+ /* FIXME */
+ /* Returns non-zero upon success, 0 upon failure. */
+ return ReadFile(hdl, buf, count, &tmp, NULL);
+#else
+ /* Returns the number of bytes read, or -1 upon failure. */
+ ret = read(serial->fd, buf, count);
+ if (ret < 0)
+ /*
+ * Should be sr_err(), but that would yield lots of
+ * "Resource temporarily unavailable" messages.
+ */
+ sr_spew("Read error: %s (fd %d).", strerror(errno), serial->fd);
+ else
+ sr_spew("Read %d/%d bytes (fd %d).", ret, count, serial->fd);
+#endif
+
+ return ret;
+}
+
+/**
+ * Set serial parameters for the specified serial port.
+ *
+ * @param serial Previously initialized serial port structure.
+ * @param baudrate The baudrate to set.
+ * @param bits The number of data bits to use.
+ * @param parity The parity setting to use (0 = none, 1 = even, 2 = odd).
+ * @param stopbits The number of stop bits to use (1 or 2).
+ * @param flowcontrol The flow control settings to use (0 = none, 1 = RTS/CTS,
+ * 2 = XON/XOFF).
+ *
+ * @return SR_OK upon success, SR_ERR upon failure.
+ */
+SR_PRIV int serial_set_params(struct sr_serial_dev_inst *serial, int baudrate,
+ int bits, int parity, int stopbits, int flowcontrol, int rts, int dtr)
+{
+ if (!serial) {
+ sr_dbg("Invalid serial port.");
+ return SR_ERR;
+ }
+
+ if (serial->fd == -1) {
+ sr_dbg("Cannot configure unopened serial port %s (fd %d).",
+ serial->port, serial->fd);
+ return SR_ERR;
+ }
+
+ sr_spew("Setting serial parameters on port %s (fd %d).", serial->port,
+ serial->fd);
+
+#ifdef _WIN32
+ DCB dcb;
+
+ if (!GetCommState(hdl, &dcb))
+ return SR_ERR;
+
+ switch (baudrate) {
+ case 115200:
+ dcb.BaudRate = CBR_115200;
+ break;
+ case 57600:
+ dcb.BaudRate = CBR_57600;
+ break;
+ case 38400:
+ dcb.BaudRate = CBR_38400;
+ break;
+ case 19200:
+ dcb.BaudRate = CBR_19200;
+ break;
+ case 9600:
+ dcb.BaudRate = CBR_9600;
+ break;
+ case 4800:
+ dcb.BaudRate = CBR_4800;
+ break;
+ case 2400:
+ dcb.BaudRate = CBR_2400;
+ break;
+ default:
+ sr_err("Unsupported baudrate %d.", baudrate);
+ return SR_ERR;
+ }
+ dcb.ByteSize = bits;
+ dcb.Parity = NOPARITY; /* TODO: Don't hardcode. */
+ dcb.StopBits = ONESTOPBIT; /* TODO: Don't hardcode. */
+
+ if (!SetCommState(hdl, &dcb))
+ return SR_ERR;
+#else
+ struct termios term;
+ speed_t baud;
+ int ret, controlbits;
+
+ if (tcgetattr(serial->fd, &term) < 0) {
+ sr_err("tcgetattr() error on port %s (fd %d): %s.",
+ serial->port, serial->fd, strerror(errno));
+ return SR_ERR;
+ }
+
+ switch (baudrate) {
+ case 50:
+ baud = B50;
+ break;
+ case 75:
+ baud = B75;
+ break;
+ case 110:
+ baud = B110;
+ break;
+ case 134:
+ baud = B134;
+ break;
+ case 150:
+ baud = B150;
+ break;
+ case 200:
+ baud = B200;
+ break;
+ case 300:
+ baud = B300;
+ break;
+ case 600:
+ baud = B600;
+ break;
+ case 1200:
+ baud = B1200;
+ break;
+ case 1800:
+ baud = B1800;
+ break;
+ case 2400:
+ baud = B2400;
+ break;
+ case 4800:
+ baud = B4800;
+ break;
+ case 9600:
+ baud = B9600;
+ break;
+ case 19200:
+ baud = B19200;
+ break;
+ case 38400:
+ baud = B38400;
+ break;
+ case 57600:
+ baud = B57600;
+ break;
+ case 115200:
+ baud = B115200;
+ break;
+ case 230400:
+ baud = B230400;
+ break;
+#ifndef __APPLE__
+ case 460800:
+ baud = B460800;
+ break;
+#endif
+ default:
+ sr_err("Unsupported baudrate %d.", baudrate);
+ return SR_ERR;
+ }
+
+ sr_spew("Configuring output baudrate to %d (%d).", baudrate, baud);
+ if (cfsetospeed(&term, baud) < 0) {
+ sr_err("cfsetospeed() error: %s.", strerror(errno));
+ return SR_ERR;
+ }
+
+ sr_spew("Configuring input baudrate to %d (%d).", baudrate, baud);
+ if (cfsetispeed(&term, baud) < 0) {
+ sr_err("cfsetispeed() error: %s.", strerror(errno));
+ return SR_ERR;
+ }
+
+ sr_spew("Configuring %d data bits.", bits);
+ term.c_cflag &= ~CSIZE;
+ switch (bits) {
+ case 8:
+ term.c_cflag |= CS8;
+ break;
+ case 7:
+ term.c_cflag |= CS7;
+ break;
+ default:
+ sr_err("Unsupported data bits number %d.", bits);
+ return SR_ERR;
+ }
+
+ sr_spew("Configuring %d stop bits.", stopbits);
+ term.c_cflag &= ~CSTOPB;
+ switch (stopbits) {
+ case 1:
+ term.c_cflag &= ~CSTOPB;
+ break;
+ case 2:
+ term.c_cflag |= CSTOPB;
+ break;
+ default:
+ sr_err("Unsupported stopbits number %d.", stopbits);
+ return SR_ERR;
+ }