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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 | ||
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 | ||
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 | ||
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)) && HAVE_DECL_BOTHER | |
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 | ||
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 | |
96 | SP_PRIV size_t get_termiox_size(void) | |
97 | { | |
98 | return sizeof(struct termiox); | |
99 | } | |
100 | ||
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 | ||
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 |