Add thermometer source code

thermometer/Makefile

+BIN=thermometer
+SRC=thermometer.c
+CFLAGS+=-std=gnu99 -Wall -Wextra -pedantic
+
+all: $(BIN)
+
+clean:
+	rm -f $(BIN)
+
+.PHONY: all clean

thermometer/README

+thermometer
+================
+
+Utility that enables read temperature from the board and processor sensors of
+Turris router.

thermometer/thermometer.c

+/*
+ * thermometer - utility that enables read temperature of Turris router
+ *
+ * Copyright (C) 2013 CZ.NIC, z.s.p.o. (http://www.nic.cz/)
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <linux/i2c-dev.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+#define I2C_LOCAL "/dev/i2c-0"
+#define I2C_ADDRESS_7_THERMOMETER 0x4C
+
+#define BUFFSIZE 64
+#define HANDLE_ERROR (fprintf(stderr, "ERROR: %s\n", strerror(errno)))
+
+int main(int argc, char **argv) {
+	const char *path = I2C_LOCAL;
+	if (argc == 2) {
+		path = argv[1];
+	}
+
+	int fd = 0;
+	fd = open(path, O_RDWR);
+	if (fd < 0) {
+		HANDLE_ERROR;
+		return 1;
+	}
+	if (ioctl(fd, I2C_SLAVE, I2C_ADDRESS_7_THERMOMETER) < 0) {
+		HANDLE_ERROR;
+		return 1;
+	}
+
+	//Prepare data
+	char buff[BUFFSIZE];
+	//Read local temperature
+	buff[0] = 0x00;
+	if (write(fd, buff, 1) != 1) {
+		HANDLE_ERROR;
+		return 2;
+	}
+	if (read(fd, buff, 1) != 1) {
+		HANDLE_ERROR;
+		return 3;
+	} else {
+		printf("Local:\t%u\n", (unsigned int)(buff[0]));
+	}
+	//Read remote temperature
+	buff[0] = 0x01;
+	if (write(fd, buff, 1) != 1) {
+		HANDLE_ERROR;
+		return 2;
+	}
+	if (read(fd, buff, 1) != 1) {
+		HANDLE_ERROR;
+		return 3;
+	} else {
+		printf("Remote:\t%u\n", (unsigned int)(buff[0]));
+	}
+
+	return 0;
+}