    /*====================================================================*
     *
     *   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.
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*
     *
     *   ptsctl.c - PTS Module Controller;
     *
     *   Contributor(s):
     *	Nathaniel Houghton <nhoughto@qca.qualcomm.com>
     *	Charles Maier <cmaier@qca.qualcomm.com>
     *	Mathieu Olivari <mathieu@qca.qualcomm.com>
     *
     *--------------------------------------------------------------------*/

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

    #include <unistd.h>
    #include <stdlib.h>
    #include <string.h>
    #include <ctype.h>

    #if defined (__linux__)
    #	include <termios.h>
    #elif defined (__APPLE__)
    #	include <termios.h>
    #elif defined (__OpenBSD__)
    #	include <termios.h>
    #elif defined (WIN32)
    #	include <windows.h>
    #else
    #error "Unknown Environment"
    #endif

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

    #include "../tools/getoptv.h"
    #include "../tools/putoptv.h"
    #include "../tools/version.h"
    #include "../tools/number.h"
    #include "../tools/symbol.h"
    #include "../tools/timer.h"
    #include "../tools/files.h"
    #include "../tools/flags.h"
    #include "../tools/timer.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/synonym.c"
    #include "../tools/todigit.c"
    #include "../tools/error.c"
    #endif

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

    #define PTSCTL_DEBUG 0
    #define PTSCTL_UNITS "CBA"
    #define PTSCTL_LEDS 5
    #define PTSCTL_BITS 7
    #define PTSCTL_WAIT 50
    #define PTSCTL_ECHO 0
    #define PTSCTL_MODE 1

    #define PTSCTL_LINE_ATTN 127
    #define PTSCTL_GRND_ATTN 127

    #define PTSCTL_BUFFER_SIZE 10
    #define PTSCTL_STRING_SIZE 15

    #ifdef WIN32
    #	define PTSCTL_PORT "com1:"
    #else
    #	define PTSCTL_PORT "/dev/ttyS0"
    #endif

    #define PTSCTL_SILENCE (1 << 0)
    #define PTSCTL_VERBOSE (1 << 1)
    #define PTSCTL_CHANGE  (1 << 2)
    #define PTSCTL_DISPLAY (1 << 3)
    #define PTSCTL_ITERATE (1 << 4)

    /*====================================================================*
     *   program variables;
     *--------------------------------------------------------------------*/

    static const struct _term_ modes [] =

    {
    	{
    		"off",
    		"0"
    	},
    	{
    		"on",
    		"1"
    	}
    };

    static char buffer [PTSCTL_BUFFER_SIZE];
    static char string [PTSCTL_STRING_SIZE];
    static signed length = 0;
    static signed offset = 0;

    /*====================================================================*
     *
     *   void cycle (char * string, unsigned offset, unsigned length);
     *
     *   rotate a number of consecutive characters starting at a given
     *   offset within a string; this is used to shift the character,
     *   that represents the power on/off bit, out of the way during
     *   data conversions from binary to ASCII and ASCII to binary;
     *
     *--------------------------------------------------------------------*/

    static void cycle (char * string, unsigned offset, unsigned length)

    {
    	signed c = string [offset];
    	memcpy (&string [offset], &string [offset + 1], length);
    	string [offset + length] = c;
    	return;
    }

    /*====================================================================*
     *
     *   void function1 (struct _file_ * port, char const * units, unsigned wait, unsigned echo);
     *
     *   send echo command to Weeder Solid State Relay modules in an order
     *   specified by units;
     *
     *--------------------------------------------------------------------*/

    static void function1 (struct _file_ * port, char const * units, unsigned wait, unsigned echo)

    {
    	extern char buffer [PTSCTL_BUFFER_SIZE];
    	extern signed length;
    	while (*units)
    	{
    		length = 0;
    		buffer [length++] = *units++;
    		buffer [length++] = 'X';
    		buffer [length++] = '0' + (echo & 1);
    		buffer [length++] = '\r';
    		if (write (port->file, buffer, length) != length)
    		{
    			error (1, errno, FILE_CANTSAVE, port->name);
    		}
    		SLEEP (wait);
    	}
    	return;
    }

    /*====================================================================*
     *
     *   void function2 (struct _file_ * port, char const * units, unsigned wait, unsigned data);
     *
     *   send write command to Weeder Solid State Relay modules in an
     *   order specified by units;
     *
     *--------------------------------------------------------------------*/

    static void function2 (struct _file_ * port, char const * units, unsigned wait, unsigned data)

    {
    	extern char buffer [PTSCTL_BUFFER_SIZE];
    	extern char string [PTSCTL_STRING_SIZE];
    	extern signed length;
    	extern signed offset;
    	memset (string, 0, sizeof (string));
    	memset (buffer, 0, sizeof (buffer));
    	for (offset = 0; offset < (signed)(sizeof (string)); offset++)
    	{
    		string [offset] = '0' + (data & 1);
    		data >>= 1;
    	}
    	cycle (string, 0, 5);
    	for (offset = 0; *units; offset += PTSCTL_LEDS)
    	{
    		length = 0;
    		buffer [length++] = *units++;
    		buffer [length++] = 'W';
    		memcpy (&buffer [length], &string [offset], PTSCTL_LEDS);
    		length += PTSCTL_LEDS;
    		buffer [length++] = '\r';
    		if (write (port->file, buffer, length) != length)
    		{
    			error (1, errno, FILE_CANTSAVE, port->name);
    		}
    		SLEEP (wait);
    	}
    	return;
    }

    /*====================================================================*
     *
     *   void function3 (struct _file_ * port, char const * units, unsigned wait);
     *
     *   read weeder solid state modules and display settings on the
     *   console as attenuation;
     *
     *--------------------------------------------------------------------*/

    static void function3 (struct _file_ * port, char const * units, unsigned wait)

    {
    	extern char buffer [PTSCTL_BUFFER_SIZE];
    	extern char string [PTSCTL_STRING_SIZE];
    	extern signed length;
    	extern signed offset;
    	signed value1 = 0;
    	signed value2 = 0;
    	memset (string, 0, sizeof (string));
    	for (offset = 0; *units; offset += PTSCTL_LEDS)
    	{
    		length = 0;
    		buffer [length++] = *units++;
    		buffer [length++] = 'R';
    		buffer [length++] = '\r';
    		if (write (port->file, buffer, length) != length)
    		{
    			error (1, errno, FILE_CANTSAVE, port->name);
    		}
    		SLEEP (wait);
    		memset (buffer, 0, sizeof (buffer));
    		if (read (port->file, buffer, PTSCTL_LEDS + 2) == -1)
    		{
    			error (1, errno, FILE_CANTREAD, port->name);
    		}
    		memcpy (&string [offset], &buffer [1], PTSCTL_LEDS);
    		SLEEP (wait);
    	}
    	cycle (string, PTSCTL_LEDS, 2);
    	while (--offset > PTSCTL_BITS)
    	{
    		value1 <<= 1;
    		value1 |= string [offset] - '0';
    	}
    	while (offset-- > 0)
    	{
    		value2 <<= 1;
    		value2 |= string [offset] - '0';
    	}
    	if ((value1 >= 0) && (value2 >= 0))
    	{
    		printf ("%d %d\n", value1, value2);
    	}
    	return;
    }

    /*====================================================================*
     *
     *   void function4 (struct _file_ * port, char const * units, unsigned wait);
     *
     *   sequence through all attenuator settings at one second intervals;
     *   this function can be used to debug program additions and changes;
     *
     *--------------------------------------------------------------------*/

    static void function4 (struct _file_ * port, char const * units, unsigned wait)

    {
    	signed value;
    	for (value = 0; value < 128; value++)
    	{
    		function2 (port, units, wait, (value << 8) | (value << 1) | 1);
    		function3 (port, units, wait);
    		SLEEP (wait);
    	}
    	return;
    }

    /*====================================================================*
     *
     *   int main (int argc, char const * argv []);
     *
     *--------------------------------------------------------------------*/

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

    {
    	static char const * optv [] =
    	{
    		"f:g:n:p:iqrvw:z",
    		"",
    		"PTS Module Controller",
    		"f f\tport is (f) [" PTSCTL_PORT "]",
    		"g n\tline ground attenuation is (n) [" LITERAL (PTSCTL_GRND_ATTN) "]",
    		"n n\tline neutral attenuation is (n) [" LITERAL (PTSCTL_LINE_ATTN) "]",
    		"p n\tpower is (n) [" LITERAL (PTSCTL_MODE) "]",
    		"q\tquiet mode",
    		"r\tread and display attenuator settings",
    		"v\tverbose mode",
    		"w n\twait (n) millseconds [" LITERAL (PTSCTL_WAIT) "]",
    		(char const *) (0)
    	};
    	struct _file_ port =
    	{
    		-1,
    		PTSCTL_PORT
    	};

    #if defined (WIN32)

    	HANDLE hSerial;
    	DCB dcbSerial =
    	{
    		0
    	};

    #else

    	struct termios termios;

    #endif

    	char const * units = PTSCTL_UNITS;
    	unsigned wait = PTSCTL_WAIT;
    	unsigned mode = PTSCTL_MODE;
    	unsigned echo = PTSCTL_ECHO;
    	unsigned line = PTSCTL_LINE_ATTN;
    	unsigned grnd = PTSCTL_GRND_ATTN;
    	unsigned data = 0;
    	flag_t flags = (flag_t)(0);
    	signed c;
    	optind = 1;
    	if (getenv ("PTSCTL"))
    	{
    		port.name = strdup (getenv ("PTSCTL"));
    	}
    	while ((c = getoptv (argc, argv, optv)) != -1)
    	{
    		switch (c)
    		{
    		case 'f':
    			port.name = optarg;
    			break;
    		case 'g':
    			_setbits (flags, PTSCTL_CHANGE);
    			grnd = (unsigned)(uintspec (optarg, 0, 0x7F));
    			break;
    		case 'n':
    			_setbits (flags, PTSCTL_CHANGE);
    			line = (unsigned)(uintspec (optarg, 0, 0x7F));
    			break;
    		case 'p':
    			_setbits (flags, PTSCTL_CHANGE);
    			mode = (unsigned)(uintspec (synonym (optarg, modes, SIZEOF (modes)), 0, 1));
    			break;
    		case 'w':
    			wait = (unsigned)(uintspec (optarg, 5, 100));
    			break;
    		case 'q':
    			_setbits (flags, PTSCTL_SILENCE);
    			break;
    		case 'r':
    			_setbits (flags, PTSCTL_DISPLAY);
    			break;
    		case 'v':
    			_setbits (flags, PTSCTL_VERBOSE);
    			break;
    		case 'z':
    			_setbits (flags, PTSCTL_ITERATE);
    			break;
    		default:
    			break;
    		}
    	}
    	argc -= optind;
    	argv += optind;
    	if (argc)
    	{
    		error (1, ENOTSUP, ERROR_TOOMANY);
    	}

    #if defined (WIN32)

    	hSerial = CreateFile (port.name, GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
    	if (hSerial == INVALID_HANDLE_VALUE)
    	{
    		error (1, errno, FILE_CANTOPEN, port.name);
    	}
    	dcbSerial.DCBlength = sizeof (dcbSerial);
    	if (!GetCommState (hSerial, &dcbSerial))
    	{
    		error (1, 0, FILE_CANTREAD " state", port.name);
    	}
    	dcbSerial.BaudRate = CBR_9600;
    	dcbSerial.ByteSize = 8;
    	dcbSerial.StopBits = ONESTOPBIT;
    	dcbSerial.Parity = NOPARITY;
    	if (!SetCommState (hSerial, &dcbSerial))
    	{
    		error (1, 0, FILE_CANTSAVE " state", port.name);
    	}
    	CloseHandle (hSerial);
    	if ((port.file = open (port.name, O_BINARY | O_RDWR)) == -1)
    	{
    		error (1, errno, FILE_CANTOPEN, port.name);
    	}

    #else

    	if ((port.file = open (port.name, O_RDWR|O_NOCTTY|O_NDELAY)) == -1)
    	{
    		error (1, 0, FILE_CANTOPEN, port.name);
    	}
    	tcgetattr (port.file, &termios);
    	termios.c_cflag = CS8;
    	cfsetospeed (&termios, B9600);
    	tcsetattr (port.file, TCSANOW, &termios);

    #endif

    	function1 (&port, units, wait, echo);
    	if (_anyset (flags, PTSCTL_CHANGE))
    	{
    		data = line << 8 | grnd << 1 | mode;
    		function2 (&port, units, wait, data);
    	}
    	if (_anyset (flags, PTSCTL_DISPLAY))
    	{
    		function3 (&port, units, wait);
    	}
    	if (_anyset (flags, PTSCTL_ITERATE))
    	{
    		function4 (&port, units, wait);
    	}
    	close (port.file);
    	return (0);
    }

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