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			ttysig.c
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/*====================================================================*
 *
 *   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 &quot;AS IS&quot; 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 &lt;nhoughto@qca.qualcomm.com&gt;
 *
 *--------------------------------------------------------------------*/

/*====================================================================*
 *   kernel header files;
 *--------------------------------------------------------------------*/

#include &lt;sys/ioctl.h&gt;

/*====================================================================*
 *   system header files;
 *--------------------------------------------------------------------*/

#include &lt;ctype.h&gt;
#include &lt;errno.h&gt;
#include &lt;fcntl.h&gt;
#include &lt;termios.h&gt;
#include &lt;stdlib.h&gt;
#include &lt;string.h&gt;
#include &lt;unistd.h&gt;

/*====================================================================*
 *   custom header files;
 *--------------------------------------------------------------------*/

#include &quot;../tools/getoptv.h&quot;
#include &quot;../tools/putoptv.h&quot;
#include &quot;../tools/version.h&quot;
#include &quot;../tools/types.h&quot;
#include &quot;../tools/flags.h&quot;
#include &quot;../tools/number.h&quot;
#include &quot;../tools/error.h&quot;

/*====================================================================*
 *   custom source files;
 *--------------------------------------------------------------------*/

#ifndef MAKEFILE
#include &quot;../tools/getoptv.c&quot;
#include &quot;../tools/putoptv.c&quot;
#include &quot;../tools/version.c&quot;
#include &quot;../tools/uintspec.c&quot;
#include &quot;../tools/todigit.c&quot;
#include &quot;../tools/error.c&quot;
#endif

/*====================================================================*
 *   constants;
 *--------------------------------------------------------------------*/

#define SERIAL_PORT &quot;/dev/ttyS0&quot;
#define TTYSIG_SET_DTR       (1 &lt;&lt; 0)
#define TTYSIG_SET_RTS       (1 &lt;&lt; 1)
#define TTYSIG_READ_STATUS   (1 &lt;&lt; 2)
#define TTYSIG_INTERACTIVE   (1 &lt;&lt; 3)
#define TTYSIG_NOPROMPT      (1 &lt;&lt; 4)

void set_status (int fd, int flag, int value)

{
	int status;
	if (ioctl (fd, TIOCMGET, &amp;status) == -1) error (1, errno, &quot;TIOCMGET failed&quot;);
	if (value) status |= flag;
	else status &amp;= ~flag;
	if (ioctl (fd, TIOCMSET, &amp;status) == -1) error (1, errno, &quot;TIOCMSET failed&quot;);
}

void print_status (int fd)

{
	int status;
	if (ioctl (fd, TIOCMGET, &amp;status) == -1) error (1, errno, &quot;TIOCMGET failed&quot;);
	printf (&quot;--&gt; DTR: %s\n&quot;, (status &amp; TIOCM_DTR)? &quot;+V&quot;: &quot;-V&quot;);
	printf (&quot;--&gt; RTS: %s\n&quot;, (status &amp; TIOCM_RTS)? &quot;+V&quot;: &quot;-V&quot;);
	printf (&quot;&lt;-- CTS: %s\n&quot;, (status &amp; TIOCM_CTS)? &quot;+V&quot;: &quot;-V&quot;);
	printf (&quot;&lt;-- DSR: %s\n&quot;, (status &amp; TIOCM_DSR)? &quot;+V&quot;: &quot;-V&quot;);
	printf (&quot;&lt;-- DCD: %s\n&quot;, (status &amp; TIOCM_CD)? &quot;+V&quot;: &quot;-V&quot;);
	printf (&quot;&lt;-- RI : %s\n&quot;, (status &amp; TIOCM_RI)? &quot;+V&quot;: &quot;-V&quot;);
}

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, &quot;\&quot;%s\&quot; is not a number&quot;, buf);
		return (-1);
	}
	*val = atoi (buf);
	p = buf;
	while (isdigit (*buf)) ++buf;
	if (*buf != '\0')
	{
		error (0, 0, &quot;\&quot;%s\&quot; is not a number&quot;, 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 (&quot;command (D #, R #, e, r, s, q): &quot;);
			fflush (stdout);
		}
		i = 0;
		while ((c = getchar ()) != EOF)
		{
			if (c == '#')
			{
				comment ();
				continue;
			}
			if (c == '\n') break;
			if (i == sizeof (buf) - 1) error (1, 0, &quot;input too large&quot;);
			buf [i++] = c;
		}
		if (c == EOF) return;
		if (i == 0) continue;
		buf [i] = '\0';
		switch (buf [0])
		{
		case 'D':
			if (number (buf + 1, &amp;value)) break;
			set_status (fd, TIOCM_DTR, value);
			break;
		case 'e':
			p = buf + 1;
			if (*p == ' ') ++p;
			printf (&quot;%s\n&quot;, p);
			fflush (stdout);
			break;
		case 'R':
			if (number (buf + 1, &amp;value)) break;
			set_status (fd, TIOCM_RTS, value);
			break;
		case 'r':
			print_status (fd);
			break;
		case 's':
			if (number (buf + 1, &amp;value)) break;
			sleep (value);
			break;
		case 'q':
		case 'Q':
			return;
			break;
		case '\0':
			break;
		default:
			error (0, 0, &quot;invalid command&quot;);
		}
	}
}

int main (int argc, char const ** argv)

{
	int fd;
	static char const * optv [] =
	{
		&quot;s:D:IR:rqv&quot;,
		&quot;[ttysig script filename]&quot;,
		&quot;Serial Line Signal Controller&quot;,
		&quot;D n\tset DTR (0 = -V, 1 = +V) at startup&quot;,
		&quot;I\tInteractive mode&quot;,
		&quot;R n\tset RTS (0 = -V, 1 = +V) at startup&quot;,
		&quot;r\tread current RTS/DTR values at startup&quot;,
		&quot;s f\tserial port is (f) [&quot; SERIAL_PORT &quot;]&quot;,
		&quot;q\tquiet mode&quot;,
		&quot;v\tverbose mode&quot;,
		(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, &quot;%s&quot;, * argv);
		if (dup2 (input, STDIN_FILENO) == -1) error (1, errno, &quot;%s&quot;, * argv);
		_setbits (flags, TTYSIG_INTERACTIVE | TTYSIG_NOPROMPT);
	}
	else if (argc &gt; 0) error (1, 0, &quot;Invalid arguments&quot;);
	fd = open (device, O_RDONLY);
	if (fd == -1) error (1, errno, &quot;could not open %s&quot;, 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);
}


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