brewco/devices.c

/*****************************************************************************
 * Copyright (C) 2014..2015
 *   
 * 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 "brewco.h"
#include "devices.h"
#include "xutil.h"
#include "keyboard.h"
#include "slcd.h"


extern int		debug;
extern sys_config	Config;
extern int		my_shutdown;
extern uint16_t         leds;
extern int              slcdHandle;

#ifdef USE_SIMULATOR

extern int		SIM_hlt_value;
extern int		SIM_mlt_value;

#endif


/*
 * Read one byte from a 1-wire device like a DS2413
 */
int read_w1(char *address, char *file)
{
    char	*addr = NULL;
    int		fn = -1, rc = -1, retries = 5;
    uint8_t	val;

    addr = xstrcpy((char *)"/sys/bus/w1/devices/");
    addr = xstrcat(addr, address);
    addr = xstrcat(addr, (char *)"/");
    addr = xstrcat(addr, file);

    if ((fn = open(addr, O_RDONLY)) >= 0) {

    	if ((lseek(fn, 0L, SEEK_SET)) == 0) {

	    while (retries--) {
    	    	if ((read(fn, &val, 1)) == 1) {
		    rc = (int)val;
		    goto leave;
    	    	}
	    }
	    syslog(LOG_NOTICE, "read_w1() read %s fatal: %s", addr, strerror(errno));

	} else {
	    syslog(LOG_NOTICE, "read_w1() lseek %s: %s", addr, strerror(errno));
	}
    	
    } else {
	syslog(LOG_NOTICE, "read_w1() open %s: %s", addr, strerror(errno));
    }

leave:
    if (fn != -1) {
	if ((close(fn)) == -1) {
	    syslog(LOG_NOTICE, "read_w1() close %s: %s", addr, strerror(errno));
	}
    }

    free(addr);
    return rc;
}


/*
 * Write a byte to a 1-wire device like a DS2413
 */
int write_w1(char *address, char *file, uint8_t val)
{
    char	*addr = NULL;
    int		fn = -1, rc = -1, retries = 5;

    addr = xstrcpy((char *)"/sys/bus/w1/devices/");
    addr = xstrcat(addr, address);
    addr = xstrcat(addr, (char *)"/");
    addr = xstrcat(addr, file);

    if ((fn = open(addr, O_WRONLY)) >= 0) {

	if ((lseek(fn, 0L, SEEK_SET)) == 0) {

	    while (retries--) {
	    	if ((write(fn, &val, 1)) == 1) {
		    rc = 0;
		    goto leave;
	    	}
	    }
	    syslog(LOG_NOTICE, "write_w1() write %s fatal: %s", addr, strerror(errno));

	} else {
	    syslog(LOG_NOTICE, "write_w1() lseek %s: %s", addr, strerror(errno));
	}

    } else {
	syslog(LOG_NOTICE, "write_w1() open %s: %s", addr, strerror(errno));
    }

leave:
    if (fn != -1) {
	if ((close(fn)) == -1) {
	    syslog(LOG_NOTICE, "write_w1() close %s: %s", addr, strerror(errno));
	}
    }

    free(addr);
    return rc;
}


void hlt_heater(int value)
{
#ifdef HAVE_WIRINGPI_H
    piLock(LOCK_LCD);
    lcdPosition(lcdHandle, 0, 1);
#endif
    slcdPosition(slcdHandle, 0, 1);
    if (value) {
	leds |= SLED_HLTH;
#ifdef HAVE_WIRINGPI_H
	lcdPutchar(lcdHandle, 5);
#endif
	slcdPutchar(slcdHandle, 5);
    } else {
	leds &= ~SLED_HLTH;
#ifdef HAVE_WIRINGPI_H
	lcdPutchar(lcdHandle, 6);
#endif
	slcdPutchar(slcdHandle, 6);
    }
#ifdef HAVE_WIRINGPI_H
    piUnlock(LOCK_LCD);
#endif
    slcdLEDs(slcdHandle);
}


void mlt_heater(int value)
{
#ifdef HAVE_WIRINGPI_H
    piLock(LOCK_LCD);
    lcdPosition(lcdHandle, 18, 1);
#endif
    slcdPosition(slcdHandle, 18, 1);
    if (value) {
        leds |= SLED_MLTH;
#ifdef HAVE_WIRINGPI_H
        lcdPutchar(lcdHandle, 5);
#endif
        slcdPutchar(slcdHandle, 5);
    } else {
        leds &= ~SLED_MLTH;
#ifdef HAVE_WIRINGPI_H
        lcdPutchar(lcdHandle, 6);
#endif
        slcdPutchar(slcdHandle, 6);
    }
#ifdef HAVE_WIRINGPI_H
    piUnlock(LOCK_LCD);
#endif
    slcdLEDs(slcdHandle);
}


void mlt_pump(int value)
{
#ifdef HAVE_WIRINGPI_H
    piLock(LOCK_LCD);
    lcdPosition(lcdHandle, 19, 1);
#endif
    slcdPosition(slcdHandle, 19, 1);
    if (value) {
        leds |= SLED_MLTP;
#ifdef HAVE_WIRINGPI_H
        lcdPutchar(lcdHandle, 3);
#endif
        slcdPutchar(slcdHandle, 3);
    } else {
        leds &= ~SLED_MLTP;
#ifdef HAVE_WIRINGPI_H
        lcdPutchar(lcdHandle, 4);
#endif
        slcdPutchar(slcdHandle, 4);
    }
#ifdef HAVE_WIRINGPI_H
    piUnlock(LOCK_LCD);
#endif
    slcdLEDs(slcdHandle);
}


int device_out(char *uuid, int value)
{
    devices_list	*device;
    time_t		now, my_timestamp;
    int			rc, my_value, test_value;

    if (uuid == NULL)
	return 0;

    now = time(NULL);

#ifdef HAVE_WIRINGPI_H
    piLock(LOCK_DEVICES);
#endif

    for (device = Config.devices; device; device = device->next) {
	if (! strcmp(uuid, device->uuid)) {
	    /*
	     * Execute command if different then the old value. But also
	     * every 2 minutes because commands can have temporary
	     * disconnects, or have radio problems.
	     */
	    my_timestamp = device->timestamp;
	    my_value = device->value;

	    if ((device->type == DEVTYPE_W1) && (device->direction == DEVDIR_OUT_BIN)) {
		test_value = (value == 0) ? 0 : 1;
	    } else {
		test_value = value;
	    }

	    if ((test_value != my_value) || (((int)now - (int)my_timestamp) >= 120)) {

#ifdef HAVE_WIRINGPI_H
		rc = 0;
		if ((device->type == DEVTYPE_GPIO) && (device->gpiopin != -1) && (device->present == DEVPRESENT_YES)) {

		}
#endif
		if ((device->type == DEVTYPE_W1) && (device->direction == DEVDIR_OUT_BIN) && (device->present == DEVPRESENT_YES)) {
		    if (strncmp(device->address, (char *)"3a", 2) == 0) {
			/*
			 * DS2413. First read state so that we can preserve the state of
			 * the "other" PIO channel. To make things a bit more complicated
			 * the bits in the state register differ from the output register.
			 */
			uint8_t	state, output;

			if ((rc = read_w1(device->address, (char *)"state")) >= 0) {
			    state = (unsigned int)rc;
			    output = (state & 0x01) + ((state & 0x04) >> 1);

			    if (device->subdevice == 0) {
				output = (output & 0xfe);
				output |= (value == 0) ? 0x01 : 0x00;
			    } else if (device->subdevice == 1) {
				output = (output & 0xfd);
				output |= (value == 0) ? 0x02 : 0x00;
			    } else {
				output = 0xff;
			    }

			    if ((write_w1(device->address, (char *)"output", output)) == 0) {
			    	syslog(LOG_NOTICE, "DS2413 PIO%c value=%d (%s)", (device->subdevice == 0) ? 'A' : 'B', (value == 0) ? 0 : 1, device->comment);
			    	if (debug)
				    fprintf(stdout, "DS2413 PIO%c value=%d (%s)\n", (device->subdevice == 0) ? 'A' : 'B', (value == 0) ? 0 : 1, device->comment);
				device->value = (value == 0) ? 0 : 1;
				device->timestamp = time(NULL);
			    }
			}
		    }
		}

#ifdef USE_SIMULATOR
		if ((device->type == DEVTYPE_SIM) && (device->direction == DEVDIR_OUT_BIN) && (device->present == DEVPRESENT_YES)) {
		    if ((strcmp((char *)"SimHLTheater", device->address) == 0) || 
			(strcmp((char *)"SimMLTheater", device->address) == 0) || 
		        (strcmp((char *)"SimMLTpump", device->address) == 0)) {
			if (value != device->value) {
			    syslog(LOG_NOTICE, "SIM %s value=%d", device->address, value);
			    if (debug)
			    	fprintf(stdout, "SIM %s value=%d\n", device->address, value);
			}
			device->value = value;
			if (strcmp((char *)"SimHLTheater", device->address) == 0) {
			    SIM_hlt_value = value;
			    hlt_heater(value);
			}
			if (strcmp((char *)"SimMLTheater", device->address) == 0) {
			    SIM_mlt_value = value;
			    mlt_heater(value);
			}
			if (strcmp((char *)"SimMLTpump", device->address) == 0) {
			    mlt_pump(value);
			}
		    }
		}
#endif
	    } else {
#ifdef HAVE_WIRINGPI_H
		piUnlock(LOCK_DEVICES);
#endif
		return 0;
	    }
	}
    }
#ifdef HAVE_WIRINGPI_H
    piUnlock(LOCK_DEVICES);
#endif

    return 0;
}	   


/*
 * Returns DEVPRESENT_NO  if failed.
 * Returns DEVPRESENT_YES if success, value contains new value.
 */
int device_in(char *uuid, int *value)
{
    devices_list	*device;
    int			tmp, present;

    if (uuid == NULL)
	return 0;

#ifdef HAVE_WIRINGPI_H
    piLock(LOCK_DEVICES);
#endif

    for (device = Config.devices; device; device = device->next) {
	if (! strcmp(uuid, device->uuid)) {
	    present = device->present;
	    if (present == DEVPRESENT_YES) {
		tmp = device->value + device->offset;
	    } else {
		tmp = 0;
	    }
#ifdef HAVE_WIRINGPI_H
	    piUnlock(LOCK_DEVICES);
#endif
	    *value = tmp;
	    return present;
	}
    }

#ifdef HAVE_WIRINGPI_H
    piUnlock(LOCK_DEVICES);
#endif

    return DEVPRESENT_NO;
}


/*
 * Auto detect hotplugged or known to be present devices
 */
int devices_detect(void)
{
    struct dirent	*de;
    DIR			*fd;
    devices_list	*device, *ndev;
    int			found, subdevices, ival, i, rc = 0;
    char		buf[40];
    uuid_t		uu;
#ifdef HAVE_WIRINGPI_H
    int			pin;
#endif

    /*
     * 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(buf, de->d_name, 2);
		    buf[2] = '\0';
		    sscanf(buf, "%02x", &ival);
		    syslog(LOG_NOTICE, "Scan 1-wire %02x %d", ival, ival);
		    subdevices = 1;
		    if (strcmp(buf, (char *)"29") == 0)
			subdevices = 8;
		    if (strcmp(buf, (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(buf, (char *)"10") == 0) {
			    ndev->direction = DEVDIR_IN_ANALOG;
			    ndev->description = xstrcpy((char *)"DS18S20 Digital thermometer");
			} else if (strcmp(buf, (char *)"22") == 0) {
			    ndev->direction = DEVDIR_IN_ANALOG;
			    ndev->description = xstrcpy((char *)"DS1820 Digital thermometer");
			} else if (strcmp(buf, (char *)"28") == 0) {
			    ndev->direction = DEVDIR_IN_ANALOG;
			    ndev->description = xstrcpy((char *)"DS18B20 Digital thermometer");
			} else if (strcmp(buf, (char *)"3a") == 0) {
			    ndev->description = xstrcpy((char *)"DS2413 Dual channel addressable switch");
			    ndev->direction = DEVDIR_IN_BIN;
			} else if (strcmp(buf, (char *)"3b") == 0) {
			    ndev->direction = DEVDIR_IN_ANALOG;
			    ndev->description = xstrcpy((char *)"DS1825 Digital thermometer");
			} else if (strcmp(buf, (char *)"42") == 0) {
			    ndev->direction = DEVDIR_IN_ANALOG;
			    ndev->description = xstrcpy((char *)"DS28EA00 Digital thermometer");
			} else if (strcmp(buf, (char *)"w1") == 0) {
			    ndev->description = xstrcpy((char *)"Master System device");
			} else {
			    ndev->description = xstrcpy((char *)"Unknown device family ");
			    ndev->description = xstrcat(ndev->description, buf);
			}
			ndev->value = ndev->offset = 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++;
		    }
		}
	    }
	}
	closedir(fd);
    }

#ifdef HAVE_WIRINGPI_H
    if (piBoardRev() == 2) {
	/*
	 * Support rev B and newer boards only
	 */
	found = FALSE;
	for (device = Config.devices; device; device = device->next) {
	    if (device->type == DEVTYPE_GPIO) {
		found = TRUE;
		break;
	    }
	}

    	if (found == FALSE) {
	    /*
	     * There were no GPIO devices found.
	     */
	    subdevices = 12;
	    pin = 0;
	    for (i = 0; i < subdevices; i++) {
	    	if (i == 8)
		    pin = 17;

	    	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_GPIO;
	    	ndev->value = digitalRead(pin);
		ndev->offset = 0;
	    	ndev->present = DEVPRESENT_YES;
	    	ndev->address = xstrcpy((char *)"GPIO");
	    	snprintf(buf, 39, "Raspberry GPIO %d", i);
	    	ndev->description = xstrcpy(buf);
	    	ndev->subdevice = i;
	    	ndev->gpiopin = pin;
	    	ndev->timestamp = time(NULL);
		switch (i) {
		    case 0:
			    	ndev->direction = DEVDIR_OUT_ANALOG;
				ndev->inuse = 1;
				ndev->comment = xstrcpy((char *)"MLT heater SSR");
				break;
		    case 1:
			    	ndev->direction = DEVDIR_OUT_ANALOG;
				ndev->inuse = 1;
				ndev->comment = xstrcpy((char *)"MLT heater PWM");
				break;
		    case 2:
				ndev->direction = DEVDIR_OUT_ANALOG;
				ndev->inuse = 1;
				ndev->comment = xstrcpy((char *)"MLT pump relay");
				break;
		    case PANEL_RETURN:
		    		ndev->direction = DEVDIR_IN_BIN;
		    		ndev->inuse = 1;
		    		ndev->comment = xstrcpy((char *)"Frontpanel Return");
				break;
		    case PANEL_ENTER:
		    		ndev->direction = DEVDIR_IN_BIN;
		    		ndev->inuse = 1;
		    		ndev->comment = xstrcpy((char *)"Frontpanel Enter key");
				break;
		    case PANEL_DOWN:
		    		ndev->direction = DEVDIR_IN_BIN;
		    		ndev->inuse = 1;
		    		ndev->comment = xstrcpy((char *)"Frontpanel Down key");
				break;
		    case PANEL_UP:
		    		ndev->direction = DEVDIR_IN_BIN;
		    		ndev->inuse = 1;
		    		ndev->comment = xstrcpy((char *)"Frontpanel Up key");
				break;
		    case 7:
		    		ndev->direction = DEVDIR_INTERN;
		    		ndev->inuse = 1;
		    		ndev->comment = xstrcpy((char *)"1-Wire bus");
				break;
		    case 8:
				ndev->direction = DEVDIR_OUT_BIN;
				ndev->inuse = 1;
				ndev->comment = xstrcpy((char *)"Buzzer");
				break;
	    	    default:
		    		ndev->direction = DEVDIR_IN_BIN;
		    		ndev->inuse = 0;
		    		ndev->comment = xstrcpy((char *)"Raspberry GPIO");
		}
	    	pin++;

	    	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++;
	    }
	}
    }
#endif

#ifdef USE_SIMULATOR
    found = FALSE;
    for (device = Config.devices; device; device = device->next) {
	if (device->type == DEVTYPE_SIM) {
	    found = TRUE;
	    break;
	}
    }

    if (found == FALSE) {
	subdevices = 6;
	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_SIM;
	    ndev->value = ndev->offset = 0;
	    ndev->present = DEVPRESENT_YES;
	    ndev->subdevice = i;
	    ndev->gpiopin = -1;
	    ndev->comment = xstrcpy((char *)"Auto detected device");
	    ndev->timestamp = time(NULL);
	    ndev->inuse = 0;
	    switch (i) {
		case 0:	ndev->direction = DEVDIR_IN_ANALOG;
			ndev->address = xstrcpy((char *)"SimRoomtemp");
			ndev->description = xstrcpy((char *)"Simulated room temperature");
			break;
		case 1:	ndev->direction = DEVDIR_IN_ANALOG;
			ndev->address = xstrcpy((char *)"SimHLTtemp");
			ndev->description = xstrcpy((char *)"Simulated HLT temperature");
			break;
		case 2:	ndev->direction = DEVDIR_IN_ANALOG;
			ndev->address = xstrcpy((char *)"SimMLTtemp");
			ndev->description = xstrcpy((char *)"Simulated MLT temperature");
			break;
		case 3:	ndev->direction = DEVDIR_OUT_BIN;
			ndev->address = xstrcpy((char *)"SimHLTheater");
			ndev->description = xstrcpy((char *)"Simulated HLT heater");
			break;
		case 4:	ndev->direction = DEVDIR_OUT_BIN;
			ndev->address = xstrcpy((char *)"SimMLTheater");
			ndev->description = xstrcpy((char *)"Simulated MLT heater");
			break;
		case 5:	ndev->direction = DEVDIR_OUT_BIN;
			ndev->address = xstrcpy((char *)"SimMLTpump");
			ndev->description = xstrcpy((char *)"Simulated MLT pump");
			break;
	    }

	    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++;
	}
    }
#endif

    return rc;
}


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

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

#ifdef HAVE_WIRINGPI_H
    if ((rc = piHiPri(10)))
    	syslog(LOG_NOTICE, "my_devices_loop: piHiPri(10) rc=%d", rc);
#endif

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

    	/*
    	 * Process all devices.
    	 */
    	for (device = Config.devices; device; device = device->next) {

	    if (my_shutdown)
		break;

	    switch (device->type) {
		case DEVTYPE_W1:
			/*
			 * Only tested with DS18B20 but from the kernel source this
			 * should work with all 1-wire thermometer sensors.
			 */
			if ((strncmp(device->address, (char *)"10", 2) == 0) ||
			    (strncmp(device->address, (char *)"22", 2) == 0) ||
			    (strncmp(device->address, (char *)"28", 2) == 0) ||
			    (strncmp(device->address, (char *)"3b", 2) == 0) ||
			    (strncmp(device->address, (char *)"42", 2) == 0)) {
			    addr = xstrcpy((char *)"/sys/bus/w1/devices/");
			    addr = xstrcat(addr, device->address);
			    addr = xstrcat(addr, (char *)"/w1_slave");
			    if ((fp = fopen(addr, "r"))) {
				if (device->present != DEVPRESENT_YES) {
				     syslog(LOG_NOTICE, "sensor %s is back", device->address);
#ifdef HAVE_WIRINGPI_H
				     piLock(LOCK_DEVICES);
#endif
				     device->present = DEVPRESENT_YES;
#ifdef HAVE_WIRINGPI_H
				     piUnlock(LOCK_DEVICES);
#endif
				}
				/*
				 * 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);
#ifdef HAVE_WIRINGPI_H
				    piLock(LOCK_DEVICES);
#endif
				    if ((rc == 1) && (device->value != temp)) {
					device->value = temp;
				    	device->timestamp = time(NULL);
				    }
#ifdef HAVE_WIRINGPI_H
				    piUnlock(LOCK_DEVICES);
#endif
				} else {
				    syslog(LOG_NOTICE, "sensor %s CRC error", device->address);
#ifdef HAVE_WIRINGPI_H
				    piLock(LOCK_DEVICES);                
#endif
				    device->present = DEVPRESENT_ERROR;
#ifdef HAVE_WIRINGPI_H
				    piUnlock(LOCK_DEVICES);              
#endif
				}
				fclose(fp);
			    } else {
				if (device->present != DEVPRESENT_NO) {
				    syslog(LOG_NOTICE, "sensor %s is missing", device->address);
#ifdef HAVE_WIRINGPI_H
				    piLock(LOCK_DEVICES);                
#endif
				    device->present = DEVPRESENT_NO;
#ifdef HAVE_WIRINGPI_H          
				    piUnlock(LOCK_DEVICES);              
#endif
				}
			    }
			    free(addr);
			    addr = NULL;
			} /* if temperature sensor */
			/*
			 * DS2413 Dual channel addressable switch
			 */
			if (strncmp(device->address, (char *)"3a", 2) == 0) {
			    addr = xstrcpy((char *)"/sys/bus/w1/devices/");
			    addr = xstrcat(addr, device->address);
			    addr = xstrcat(addr, (char *)"/state");

			    if ((access(addr, R_OK)) == 0) {
				if (device->present != DEVPRESENT_YES) {
				    syslog(LOG_NOTICE, "DS2413 %s is back", device->address);
#ifdef HAVE_WIRINGPI_H
				    piLock(LOCK_DEVICES);
#endif
				    device->present = DEVPRESENT_YES;
#ifdef HAVE_WIRINGPI_H
				    piUnlock(LOCK_DEVICES);
#endif
				}
				/*
				 * First make sure that if this device is configured as input
				 * to drive the output high.
				 */
				if (device->direction == DEVDIR_IN_BIN) {
				    uint8_t state, output;

				    if ((rc = read_w1(device->address, (char *)"state")) >= 0) {
					state = (unsigned int)rc;
					output = ((state & 0x02) >> 1) + ((state & 0x08) >> 2);		/* Both latch states	*/
					if (device->subdevice == 0) {
					    output = (output & 0xfe);
					    output |= 0x01;
					} else if (device->subdevice == 1) {
					    output = (output & 0xfd);
					    output |= 0x02;
					} else {
					    output = 0xff;
					}
					write_w1(device->address, (char *)"output", output);
				    }
				}
				if ((rc = read_w1(device->address, (char *)"state")) >= 0) {
#ifdef HAVE_WIRINGPI_H
				    piLock(LOCK_DEVICES);
#endif
				    /*
				     * Read PIOA or PIOB pin state bits
				     */
				    if (device->subdevice == 0)
					device->value = (rc & 0x01) ? 0 : 1;
				    else if (device->subdevice == 1)
					device->value = (rc & 0x04) ? 0 : 1;
				    device->timestamp = time(NULL);
#ifdef HAVE_WIRINGPI_H
				    piUnlock(LOCK_DEVICES);
#endif
				}
			    } else {
				if (device->present != DEVPRESENT_NO) {
				    syslog(LOG_NOTICE, "DS2413 %s is missing", device->address);
#ifdef HAVE_WIRINGPI_H
				    piLock(LOCK_DEVICES);
#endif
				    device->present = DEVPRESENT_NO;
#ifdef HAVE_WIRINGPI_H          
				    piUnlock(LOCK_DEVICES);
#endif
				}
			    }
			    free(addr);
			    addr = NULL;
			}

			break;

#ifdef HAVE_WIRINGPI_H
		case DEVTYPE_GPIO:
			if (device->direction == DEVDIR_IN_BIN) {
			    piLock(LOCK_DEVICES);
			    device->value = digitalRead(device->gpiopin);
			    device->offset = 0;
			    device->timestamp = time(NULL);
			    piUnlock(LOCK_DEVICES);
			}
			break;

#endif
#ifdef USE_SIMULATOR
		case DEVTYPE_SIM:
#ifdef HAVE_WIRINGPI_H
			piLock(LOCK_DEVICES);
#endif
			if (Config.simulator) {
			    if (device->subdevice == 0) {
			    	device->value = (int)(Config.simulator->room_temperature * 1000);
			    	device->timestamp = time(NULL);
			    } else if (device->subdevice == 1) {
			    	device->value = (int)(Config.simulator->hlt_temperature * 1000);
			    	device->timestamp = time(NULL);
			    } else if (device->subdevice == 2) {
			    	device->value = (int)(Config.simulator->mlt_temperature * 1000);
			    	device->timestamp = time(NULL);
			    }
			}
#ifdef HAVE_WIRINGPI_H
			piUnlock(LOCK_DEVICES);
#endif
			break;
#endif
		default:
			break;
	    }

	    /*
	     * Delay a bit after procesing a device.
	     */
	    usleep(10000);
	}

	if (my_shutdown)
	    break;
	/*
	 * Delay a bit after all devices
	 */
	usleep(100000);
    }

    syslog(LOG_NOTICE, "Thread my_devices_loop stopped");
    if (debug)
	fprintf(stdout, "Thread my_devices_loop stopped\n");
    return 0;
}