mirror of
git://sigrok.org/libserialport
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130 lines
3.4 KiB
C
130 lines
3.4 KiB
C
/*
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* This file is part of the libserialport project.
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*
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* Copyright (C) 2013 Martin Ling <martin-libserialport@earth.li>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* At the time of writing, glibc does not support the Linux kernel interfaces
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* for setting non-standard baud rates and flow control. We therefore have to
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* prepare the correct ioctls ourselves, for which we need the declarations in
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* linux/termios.h.
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*
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* We can't include linux/termios.h in serialport.c however, because its
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* contents conflict with the termios.h provided by glibc. So this file exists
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* to isolate the bits of code which use the kernel termios declarations.
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*
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* The details vary by architecture. Some architectures have c_ispeed/c_ospeed
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* in struct termios, accessed with TCSETS/TCGETS. Others have these fields in
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* struct termios2, accessed with TCSETS2/TCGETS2. Some architectures have the
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* TCSETX/TCGETX ioctls used with struct termiox, others do not.
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*/
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#include <config.h>
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#include <stdlib.h>
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#include <linux/termios.h>
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#include "linux_termios.h"
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SP_PRIV unsigned long get_termios_get_ioctl(void)
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{
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#ifdef HAVE_STRUCT_TERMIOS2
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return TCGETS2;
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#else
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return TCGETS;
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#endif
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}
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SP_PRIV unsigned long get_termios_set_ioctl(void)
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{
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#ifdef HAVE_STRUCT_TERMIOS2
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return TCSETS2;
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#else
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return TCSETS;
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#endif
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}
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SP_PRIV size_t get_termios_size(void)
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{
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#ifdef HAVE_STRUCT_TERMIOS2
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return sizeof(struct termios2);
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#else
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return sizeof(struct termios);
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#endif
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}
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#if (defined(HAVE_TERMIOS_SPEED) || defined(HAVE_TERMIOS2_SPEED)) && HAVE_DECL_BOTHER
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SP_PRIV int get_termios_speed(void *data)
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{
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#ifdef HAVE_STRUCT_TERMIOS2
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struct termios2 *term = (struct termios2 *) data;
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#else
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struct termios *term = (struct termios *) data;
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#endif
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if (term->c_ispeed != term->c_ospeed)
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return -1;
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else
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return term->c_ispeed;
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}
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SP_PRIV void set_termios_speed(void *data, int speed)
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{
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#ifdef HAVE_STRUCT_TERMIOS2
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struct termios2 *term = (struct termios2 *) data;
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#else
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struct termios *term = (struct termios *) data;
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#endif
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term->c_cflag &= ~CBAUD;
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term->c_cflag |= BOTHER;
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term->c_ispeed = term->c_ospeed = speed;
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}
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#endif
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#ifdef HAVE_STRUCT_TERMIOX
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SP_PRIV size_t get_termiox_size(void)
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{
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return sizeof(struct termiox);
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}
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SP_PRIV int get_termiox_flow(void *data, int *rts, int *cts, int *dtr, int *dsr)
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{
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struct termiox *termx = (struct termiox *) data;
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int flags = 0;
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*rts = (termx->x_cflag & RTSXOFF);
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*cts = (termx->x_cflag & CTSXON);
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*dtr = (termx->x_cflag & DTRXOFF);
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*dsr = (termx->x_cflag & DSRXON);
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return flags;
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}
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SP_PRIV void set_termiox_flow(void *data, int rts, int cts, int dtr, int dsr)
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{
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struct termiox *termx = (struct termiox *) data;
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termx->x_cflag &= ~(RTSXOFF | CTSXON | DTRXOFF | DSRXON);
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if (rts)
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termx->x_cflag |= RTSXOFF;
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if (cts)
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termx->x_cflag |= CTSXON;
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if (dtr)
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termx->x_cflag |= DTRXOFF;
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if (dsr)
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termx->x_cflag |= DSRXON;
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}
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#endif
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