Initial revision
diff --git a/include/dtt.h b/include/dtt.h
new file mode 100644
index 0000000..f3d95ff
--- /dev/null
+++ b/include/dtt.h
@@ -0,0 +1,67 @@
+/*
+ * (C) Copyright 2001
+ * Erik Theisen, Wave 7 Optics, etheisen@mindspring.com.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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
+ */
+
+/*
+ * Digital Thermometers and Thermostats.
+ */
+#ifndef _DTT_H_
+#define _DTT_H_
+
+#if defined(CONFIG_DTT_LM75) || defined(CONFIG_DTT_DS1621)
+#define CONFIG_DTT /* We have a DTT */
+
+#define DTT_COMMERCIAL_MAX_TEMP 70 /* 0 - +70 C */
+#define DTT_INDUSTRIAL_MAX_TEMP 85 /* -40 - +85 C */
+#define DTT_AUTOMOTIVE_MAX_TEMP 105 /* -40 - +105 C */
+#ifndef CFG_DTT_MAX_TEMP
+#define CFG_DTT_MAX_TEMP DTT_COMMERCIAL_MAX_TEMP
+#endif
+#ifndef CFG_DTT_HYSTERESIS
+#define CFG_DTT_HYSTERESIS 5 /* 5 C */
+#endif
+
+extern int dtt_init (void);
+extern int dtt_read(int sensor, int reg);
+extern int dtt_write(int sensor, int reg, int val);
+extern int dtt_get_temp(int sensor);
+#endif
+
+#if defined(CONFIG_DTT_LM75)
+#define DTT_READ_TEMP 0x0
+#define DTT_CONFIG 0x1
+#define DTT_TEMP_HYST 0x2
+#define DTT_TEMP_SET 0x3
+#endif
+
+#if defined(CONFIG_DTT_DS1621)
+#define DTT_READ_TEMP 0xAA
+#define DTT_READ_COUNTER 0xA8
+#define DTT_READ_SLOPE 0xA9
+#define DTT_WRITE_START_CONV 0xEE
+#define DTT_WRITE_STOP_CONV 0x22
+#define DTT_TEMP_HIGH 0xA1
+#define DTT_TEMP_LOW 0xA2
+#define DTT_CONFIG 0xAC
+#endif
+
+#endif /* _DTT_H_ */
