thermferm/devices.c

/*****************************************************************************
 * Copyright (C) 2014
 *   
 * Michiel Broek <mbroek at mbse dot eu>
 *
 * This file is part of the mbsePi-apps
 *
 * This 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, or (at your option) any
 * later version.
 *
 * mbsePi-apps 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 thermferm; see the file COPYING.  If not, write to the Free
 * Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *****************************************************************************/

#include "devices.h"
#include "thermferm.h"
#include "xutil.h"


extern int		debug;
extern sys_config	Config;
extern int		my_shutdown;


/*
 * Auto detect hotplugged or known to be present devices
 */
int devices_detect(void)
{
    struct dirent	*de;
//    FILE		*fp;
    DIR			*fd;
    devices_list	*device, *ndev;
    int			found, subdevices, i, rc = 0;
    char		family[3];
    uuid_t		uu;

    /*
     * Scan for 1-wire devices
     */
    if ((fd = opendir((char *)"/sys/bus/w1/devices"))) {
	while ((de = readdir(fd))) {
	    if (de->d_name[0] != '.') {
		found = FALSE;
		for (device = Config.devices; device; device = device->next) {
		    if (strcmp(device->address,de->d_name) == 0) {
			found = TRUE;
			break;
		    }
		}

		if (found == FALSE) {
		    strncpy(family, de->d_name, 2);
		    family[2] = '\0';
		    subdevices = 1;
		    if (strcmp(family, (char *)"29") == 0)
			subdevices = 8;
		    if (strcmp(family, (char *)"3a") == 0)
			subdevices = 2;
		    for (i = 0; i < subdevices; i++) {
			ndev = (devices_list *)malloc(sizeof(devices_list));
			ndev->next = NULL;
			ndev->version = 1;
			ndev->uuid = malloc(37);
			uuid_generate(uu);
			uuid_unparse(uu, ndev->uuid);
			ndev->type = DEVTYPE_W1;
			ndev->direction = DEVDIR_UNDEF;
			if (strcmp(family, (char *)"10") == 0) {
			    ndev->direction = DEVDIR_IN_ANALOG;
			    ndev->description = xstrcpy((char *)"18S20,Digital thermometer");
			} else if (strcmp(family, (char *)"28") == 0) {
			    ndev->direction = DEVDIR_IN_ANALOG;
			    ndev->description = xstrcpy((char *)"18B20,Digital thermometer");
			} else if (strcmp(family, (char *)"29") == 0) {
			    ndev->description = xstrcpy((char *)"2408,8 Channel addressable switch/LCD");
			} else if (strcmp(family, (char *)"3a") == 0) {
			    ndev->description = xstrcpy((char *)"2413,Dual channel addressable switch");
			} else if (strcmp(family, (char *)"w1") == 0) {
			    ndev->description = xstrcpy((char *)"Master System device");
			} else {
			    ndev->description = xstrcpy((char *)"Unknown device family ");
			    ndev->description = xstrcat(ndev->description, family);
			}
			ndev->value = ndev->inuse = 0;
			ndev->present = DEVPRESENT_YES;
			ndev->address = xstrcpy(de->d_name);
			ndev->subdevice = i;
			ndev->gpiopin = -1;
			ndev->comment = xstrcpy((char *)"Auto detected device");
			ndev->timestamp = time(NULL);

			if (Config.devices == NULL) {
			    Config.devices = ndev;
			} else {
			    for (device = Config.devices; device; device = device->next) {
				if (device->next == NULL) {
				    device->next = ndev;
				    break;
				}
			    }
			}
			rc++;
		    }
		}
	    }
	}
    }

    return rc;
}


#ifdef HAVE_WIRINGPI_H
PI_THREAD (my_devices_loop)
#else
void *my_devices_loop(void *threadid)
#endif
{
    devices_list	*device;
//    char		line[60], *p = NULL;
  //  FILE		*fp;
//    int			temp, rc, deviation;

    syslog(LOG_NOTICE, "Thread my_devices_loop started");
    if (debug)
	fprintf(stdout, "Thread my_devices_loop started\n");

    /*
     * Loop forever until the external shutdown variable is set.
     */
    for (;;) {

    	/*
    	 * Here send our 1-wire sensors values
    	 */
    	for (device = Config.devices; device; device = device->next) {

	    if (my_shutdown)
		break;

	    /*
	     * Build path to the on-wire sensor
	     */
//	    device = xstrcpy((char *)"/sys/bus/w1/devices/");
//	    device = xstrcat(device, tmp1->master);
//	    device = xstrcat(device, (char *)"/");
//	    device = xstrcat(device, tmp1->name);
//	    device = xstrcat(device, (char *)"/w1_slave");

	    /*
	     * Read sensor data
	     */
//	    if ((fp = fopen(device, "r"))) {
		/*
		 * The output looks like:
		 * 72 01 4b 46 7f ff 0e 10 57 : crc=57 YES
		 * 72 01 4b 46 7f ff 0e 10 57 t=23125
		 */
//		fgets(line, 50, fp);
//		line[strlen(line)-1] = '\0';
//		if ((line[36] == 'Y') && (line[37] == 'E')) {
		    /*
		     * CRC is Ok, continue
		     */
//		    fgets(line, 50, fp);
//		    line[strlen(line)-1] = '\0';
//		    strtok(line, (char *)"=");
//		    p = strtok(NULL, (char *)"=");
//		    rc = sscanf(p, "%d", &temp);
//		    if ((rc == 1) && (tmp1->lastval != temp)) {
			/*
			 * It is possible to have read errors or extreme values.
			 * This can happen with bad connections so we compare the
			 * value with the previous one. If the difference is too
			 * much, we don't send that value. That also means that if
			 * the next value is ok again, it will be marked invalid too.
			 * Maximum error is 20 degrees for now.
			 */
//			deviation = 20000;
//			if ( (tmp1->lastval == 0) ||
//			     (tmp1->lastval && (temp > (tmp1->lastval - deviation)) && (temp < (tmp1->lastval + deviation))) ) {
			    /*
			     * Temperature is changed and valid, set flag.
			     */
//			    tmp1->update = TRUE;
//			} else {
//			    syslog(LOG_NOTICE, "deviation error deviation=%d, old=%d new=%d", deviation, tmp1->lastval, temp);
//			    if (debug) {
//				fprintf(stdout, "deviation error deviation=%d, old=%d new=%d\n", deviation, tmp1->lastval, temp);
//			    }
//			}
//			tmp1->lastval = temp;
//		    }
//		} else {
//		    syslog(LOG_NOTICE, "sensor %s/%s CRC error", tmp1->master, tmp1->name);
//		}
//		fclose(fp);
//		tmp1->present = 1;
//	    } else {
//		tmp1->present = 0;
//		if (debug)
//		    printf("sensor %s is missing\n", tmp1->name);
//	    }

//	    free(device);
//	    device = NULL;
    	}
	usleep(10000);
    }

    syslog(LOG_NOTICE, "Thread my_devices_loop stopped");
    if (debug)
	fprintf(stdout, "Thread my_devices_loop stopped\n");

    return 0;
}