1 /*
2 * This file is part of the libserialport project.
3 *
4 * Copyright (C) 2013 Martin Ling <martin-libserialport@earth.li>
5 *
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU Lesser General Public License as
8 * published by the Free Software Foundation, either version 3 of the
9 * License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20 /*
21 * At the time of writing, glibc does not support the Linux kernel interfaces
22 * for setting non-standard baud rates and flow control. We therefore have to
23 * prepare the correct ioctls ourselves, for which we need the declarations in
24 * linux/termios.h.
25 *
26 * We can't include linux/termios.h in serialport.c however, because its
27 * contents conflict with the termios.h provided by glibc. So this file exists
28 * to isolate the bits of code which use the kernel termios declarations.
29 *
30 * The details vary by architecture. Some architectures have c_ispeed/c_ospeed
31 * in struct termios, accessed with TCSETS/TCGETS. Others have these fields in
32 * struct termios2, accessed with TCSETS2/TCGETS2. Some architectures have the
33 * TCSETX/TCGETX ioctls used with struct termiox, others do not.
34 */
35
36 #include <config.h>
37 #include <stdlib.h>
38 #include <linux/termios.h>
39 #include "linux_termios.h"
40
get_termios_get_ioctl(void)41 SP_PRIV unsigned long get_termios_get_ioctl(void)
42 {
43 #ifdef HAVE_STRUCT_TERMIOS2
44 return TCGETS2;
45 #else
46 return TCGETS;
47 #endif
48 }
49
get_termios_set_ioctl(void)50 SP_PRIV unsigned long get_termios_set_ioctl(void)
51 {
52 #ifdef HAVE_STRUCT_TERMIOS2
53 return TCSETS2;
54 #else
55 return TCSETS;
56 #endif
57 }
58
get_termios_size(void)59 SP_PRIV size_t get_termios_size(void)
60 {
61 #ifdef HAVE_STRUCT_TERMIOS2
62 return sizeof(struct termios2);
63 #else
64 return sizeof(struct termios);
65 #endif
66 }
67
68 #if (defined(HAVE_TERMIOS_SPEED) || defined(HAVE_TERMIOS2_SPEED)) && defined(HAVE_DECL_BOTHER)
get_termios_speed(void * data)69 SP_PRIV int get_termios_speed(void *data)
70 {
71 #ifdef HAVE_STRUCT_TERMIOS2
72 struct termios2 *term = (struct termios2 *) data;
73 #else
74 struct termios *term = (struct termios *) data;
75 #endif
76 if (term->c_ispeed != term->c_ospeed)
77 return -1;
78 else
79 return term->c_ispeed;
80 }
81
set_termios_speed(void * data,int speed)82 SP_PRIV void set_termios_speed(void *data, int speed)
83 {
84 #ifdef HAVE_STRUCT_TERMIOS2
85 struct termios2 *term = (struct termios2 *) data;
86 #else
87 struct termios *term = (struct termios *) data;
88 #endif
89 term->c_cflag &= ~CBAUD;
90 term->c_cflag |= BOTHER;
91 term->c_ispeed = term->c_ospeed = speed;
92 }
93 #endif
94
95 #ifdef HAVE_STRUCT_TERMIOX
get_termiox_size(void)96 SP_PRIV size_t get_termiox_size(void)
97 {
98 return sizeof(struct termiox);
99 }
100
get_termiox_flow(void * data,int * rts,int * cts,int * dtr,int * dsr)101 SP_PRIV int get_termiox_flow(void *data, int *rts, int *cts, int *dtr, int *dsr)
102 {
103 struct termiox *termx = (struct termiox *) data;
104 int flags = 0;
105
106 *rts = (termx->x_cflag & RTSXOFF);
107 *cts = (termx->x_cflag & CTSXON);
108 *dtr = (termx->x_cflag & DTRXOFF);
109 *dsr = (termx->x_cflag & DSRXON);
110
111 return flags;
112 }
113
set_termiox_flow(void * data,int rts,int cts,int dtr,int dsr)114 SP_PRIV void set_termiox_flow(void *data, int rts, int cts, int dtr, int dsr)
115 {
116 struct termiox *termx = (struct termiox *) data;
117
118 termx->x_cflag &= ~(RTSXOFF | CTSXON | DTRXOFF | DSRXON);
119
120 if (rts)
121 termx->x_cflag |= RTSXOFF;
122 if (cts)
123 termx->x_cflag |= CTSXON;
124 if (dtr)
125 termx->x_cflag |= DTRXOFF;
126 if (dsr)
127 termx->x_cflag |= DSRXON;
128 }
129 #endif
130