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blazer_ser.c

/*
 * blazer_ser.c: support for Megatec/Q1 serial protocol based UPSes
 *
 * A document describing the protocol implemented by this driver can be
 * found online at "http://www.networkupstools.org/protocols/megatec.html".
 *
 * Copyright (C) 2008 - Arjen de Korte <adkorte-guest@alioth.debian.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include "main.h"
#include "serial.h"
#include "blazer.h"

#define DRIVER_NAME     "Megatec/Q1 protocol serial driver"
#define DRIVER_VERSION  "1.51"

/* driver description structure */
upsdrv_info_t upsdrv_info = {
      DRIVER_NAME,
      DRIVER_VERSION,
      "Arjen de Korte <adkorte-guest@alioth.debian.org>",
      DRV_BETA,
      { NULL }
};

#define SER_WAIT_SEC    1

/*
 * Generic command processing function. Send a command and read a reply.
 * Returns < 0 on error, 0 on timeout and the number of bytes read on
 * success.
 */
int blazer_command(const char *cmd, char *buf, size_t buflen)
{
#ifndef TESTING
      int   ret;

      ser_flush_io(upsfd);

      ret = ser_send(upsfd, "%s", cmd);

      if (ret <= 0) {
            upsdebugx(3, "send: %s", ret ? strerror(errno) : "timeout");
            return ret;
      }

      upsdebugx(3, "send: %.*s", (int)strcspn(cmd, "\r"), cmd);

      ret = ser_get_buf(upsfd, buf, buflen, SER_WAIT_SEC, 0);

      if (ret <= 0) {
            upsdebugx(3, "read: %s", ret ? strerror(errno) : "timeout");
            return ret;
      }

      upsdebugx(3, "read: %.*s", (int)strcspn(buf, "\r"), buf);
      return ret;
#else
      const struct {
            const char  *cmd;
            const char  *answer;
      } testing[] = {
            { "Q1\r", "(215.0 195.0 230.0 014 49.0 2.27 30.0 00101000\r" },
            { "F\r",  "#230.0 000 024.0 50.0\r" },
            { "I\r",  "#NOT_A_LIVE_UPS  TESTING    TESTING   \r" },
            { NULL }
      };

      int   i;

      memset(buf, 0, buflen);

      for (i = 0; cmd && testing[i].cmd; i++) {

            if (strcasecmp(cmd, testing[i].cmd)) {
                  continue;
            }

            return snprintf(buf, buflen, "%s", testing[i].answer);
      }

      return snprintf(buf, buflen, "%s", testing[i].cmd);
#endif
}


void upsdrv_help(void)
{
      printf("Read The Fine Manual ('man 8 blazer')\n");
}


void upsdrv_makevartable(void)
{
      addvar(VAR_VALUE, "cablepower", "Set cable power for serial interface");

      blazer_makevartable();
}


void upsdrv_initups(void)
{
      const struct {
            const char  *val;
            const int   dtr;
            const int   rts;
      } cablepower[] = {
            { "normal", 1, 0 }, /* default */
            { "reverse",      0, 1 },
            { "both",   1, 1 },
            { "none",   0, 0 },
            { NULL }
      };

      int   i;

      const char  *val;
#ifndef TESTING
      struct termios          tio;

      /*
       * Open and lock the serial port and set the speed to 2400 baud.
       */
      upsfd = ser_open(device_path);
      ser_set_speed(upsfd, device_path, B2400);

      if (tcgetattr(upsfd, &tio)) {
            fatal_with_errno(EXIT_FAILURE, "tcgetattr");
      }

      /*
       * Use canonical mode input processing (to read reply line)
       */
      tio.c_lflag |= ICANON;  /* Canonical input (erase and kill processing) */

      tio.c_cc[VEOF]   = _POSIX_VDISABLE;
      tio.c_cc[VEOL]   = '\r';
      tio.c_cc[VERASE] = _POSIX_VDISABLE;
      tio.c_cc[VINTR]  = _POSIX_VDISABLE;
      tio.c_cc[VKILL]  = _POSIX_VDISABLE;
      tio.c_cc[VQUIT]  = _POSIX_VDISABLE;
      tio.c_cc[VSUSP]  = _POSIX_VDISABLE;
      tio.c_cc[VSTART] = _POSIX_VDISABLE;
      tio.c_cc[VSTOP]  = _POSIX_VDISABLE;

      if (tcsetattr(upsfd, TCSANOW, &tio)) {
            fatal_with_errno(EXIT_FAILURE, "tcsetattr");
      }

      val = getval("cablepower");
      for (i = 0; val && cablepower[i].val; i++) {

            if (!strcasecmp(val, cablepower[i].val)) {
                  break;
            }
      }

      if (!cablepower[i].val) {
            fatalx(EXIT_FAILURE, "Value '%s' not valid for 'cablepower'", val);
      }

      ser_set_dtr(upsfd, cablepower[i].dtr);
      ser_set_rts(upsfd, cablepower[i].rts);

      /*
       * Allow some time to settle for the cablepower
       */
      usleep(100000);
#endif
      blazer_initups();
}


void upsdrv_initinfo(void)
{
      blazer_initinfo();
}


void upsdrv_cleanup(void)
{
#ifndef TESTING
      ser_set_dtr(upsfd, 0);
      ser_close(upsfd, device_path);
#endif
}

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