/*====================================================================*
*
* Copyright (c) 2013 Qualcomm Atheros, Inc.
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted (subject to the limitations
* in the disclaimer below) provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* * Neither the name of Qualcomm Atheros nor the names of
* its contributors may be used to endorse or promote products
* derived from this software without specific prior written
* permission.
*
* NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
* GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE
* COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*--------------------------------------------------------------------*/
/*====================================================================*
*
* ttysig.c - Serial Line Signal Controller;
*
* This program is for Linux only;
*
* Contributor(s):
* Nathaniel Houghton <nhoughto@qca.qualcomm.com>
*
*--------------------------------------------------------------------*/
/*====================================================================*
* kernel header files;
*--------------------------------------------------------------------*/
#include <sys/ioctl.h>
/*====================================================================*
* system header files;
*--------------------------------------------------------------------*/
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <termios.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/*====================================================================*
* custom header files;
*--------------------------------------------------------------------*/
#include "../tools/getoptv.h"
#include "../tools/putoptv.h"
#include "../tools/version.h"
#include "../tools/types.h"
#include "../tools/flags.h"
#include "../tools/number.h"
#include "../tools/error.h"
/*====================================================================*
* custom source files;
*--------------------------------------------------------------------*/
#ifndef MAKEFILE
#include "../tools/getoptv.c"
#include "../tools/putoptv.c"
#include "../tools/version.c"
#include "../tools/uintspec.c"
#include "../tools/todigit.c"
#include "../tools/error.c"
#endif
/*====================================================================*
* constants;
*--------------------------------------------------------------------*/
#define SERIAL_PORT "/dev/ttyS0"
#define TTYSIG_SET_DTR (1 << 0)
#define TTYSIG_SET_RTS (1 << 1)
#define TTYSIG_READ_STATUS (1 << 2)
#define TTYSIG_INTERACTIVE (1 << 3)
#define TTYSIG_NOPROMPT (1 << 4)
void set_status (int fd, int flag, int value)
{
int status;
if (ioctl (fd, TIOCMGET, &status) == -1) error (1, errno, "TIOCMGET failed");
if (value) status |= flag;
else status &= ~flag;
if (ioctl (fd, TIOCMSET, &status) == -1) error (1, errno, "TIOCMSET failed");
}
void print_status (int fd)
{
int status;
if (ioctl (fd, TIOCMGET, &status) == -1) error (1, errno, "TIOCMGET failed");
printf ("--> DTR: %s\n", (status & TIOCM_DTR)? "+V": "-V");
printf ("--> RTS: %s\n", (status & TIOCM_RTS)? "+V": "-V");
printf ("<-- CTS: %s\n", (status & TIOCM_CTS)? "+V": "-V");
printf ("<-- DSR: %s\n", (status & TIOCM_DSR)? "+V": "-V");
printf ("<-- DCD: %s\n", (status & TIOCM_CD)? "+V": "-V");
printf ("<-- RI : %s\n", (status & TIOCM_RI)? "+V": "-V");
}
void comment (void)
{
int c;
while ((c = getchar ()) != EOF)
{
if (c == '\n')
{
ungetc (c, stdin);
break;
}
}
}
int number (char *buf, int *val)
{
char *p;
while (isspace (*buf)) ++buf;
if (!isdigit (*buf))
{
error (0, 0, "\"%s\" is not a number", buf);
return (-1);
}
*val = atoi (buf);
p = buf;
while (isdigit (*buf)) ++buf;
if (*buf != '\0')
{
error (0, 0, "\"%s\" is not a number", p);
return (-1);
}
return (0);
}
void interactive (int fd, flag_t flags)
{
char buf [32];
int i,
c;
int value;
char *p;
for (; ; )
{
if (!_anyset (flags, TTYSIG_NOPROMPT))
{
printf ("command (D #, R #, e, r, s, q): ");
fflush (stdout);
}
i = 0;
while ((c = getchar ()) != EOF)
{
if (c == '#')
{
comment ();
continue;
}
if (c == '\n') break;
if (i == sizeof (buf) - 1) error (1, 0, "input too large");
buf [i++] = c;
}
if (c == EOF) return;
if (i == 0) continue;
buf [i] = '\0';
switch (buf [0])
{
case 'D':
if (number (buf + 1, &value)) break;
set_status (fd, TIOCM_DTR, value);
break;
case 'e':
p = buf + 1;
if (*p == ' ') ++p;
printf ("%s\n", p);
fflush (stdout);
break;
case 'R':
if (number (buf + 1, &value)) break;
set_status (fd, TIOCM_RTS, value);
break;
case 'r':
print_status (fd);
break;
case 's':
if (number (buf + 1, &value)) break;
sleep (value);
break;
case 'q':
case 'Q':
return;
break;
case '\0':
break;
default:
error (0, 0, "invalid command");
}
}
}
int main (int argc, char const ** argv)
{
int fd;
static char const * optv [] =
{
"s:D:IR:rqv",
"[ttysig script filename]",
"Serial Line Signal Controller",
"D n\tset DTR (0 = -V, 1 = +V) at startup",
"I\tInteractive mode",
"R n\tset RTS (0 = -V, 1 = +V) at startup",
"r\tread current RTS/DTR values at startup",
"s f\tserial port is (f) [" SERIAL_PORT "]",
"q\tquiet mode",
"v\tverbose mode",
(char const *) (0)
};
signed c;
optind = 1;
flag_t flags = 0;
uint8_t dtr_value;
uint8_t rts_value;
char *device = SERIAL_PORT;
int input = -1;
while ((c = getoptv (argc, argv, optv)) != -1)
{
switch ((char) (c))
{
case 'D':
dtr_value = uintspec (optarg, 0, 1);
_setbits (flags, TTYSIG_SET_DTR);
break;
case 'I':
_setbits (flags, TTYSIG_INTERACTIVE);
break;
case 'R':
rts_value = uintspec (optarg, 0, 1);
_setbits (flags, TTYSIG_SET_RTS);
break;
case 'r':
_setbits (flags, TTYSIG_READ_STATUS);
break;
case 's':
device = optarg;
break;
default:
break;
}
}
argc -= optind;
argv += optind;
if (argc == 1)
{
input = open (* argv, O_RDONLY);
if (input == -1) error (1, errno, "%s", * argv);
if (dup2 (input, STDIN_FILENO) == -1) error (1, errno, "%s", * argv);
_setbits (flags, TTYSIG_INTERACTIVE | TTYSIG_NOPROMPT);
}
else if (argc > 0) error (1, 0, "Invalid arguments");
fd = open (device, O_RDONLY);
if (fd == -1) error (1, errno, "could not open %s", device);
if (_anyset (flags, TTYSIG_SET_DTR)) set_status (fd, TIOCM_DTR, dtr_value);
if (_anyset (flags, TTYSIG_SET_RTS)) set_status (fd, TIOCM_RTS, rts_value);
if (_anyset (flags, TTYSIG_READ_STATUS)) print_status (fd);
if (_anyset (flags, TTYSIG_INTERACTIVE)) interactive (fd, flags);
close (fd);
return (0);
}