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diff --git a/ao-tools/lib/ao-ms5607.h b/ao-tools/lib/ao-ms5607.h
new file mode 100644
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+++ b/ao-tools/lib/ao-ms5607.h
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+/*
+ * Copyright © 2012 Keith Packard <keithp@keithp.com>
+ *
+ * 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.
+ */
+
+#ifndef _AO_MS5607_H_
+#define _AO_MS5607_H_
+
+#include <stdint.h>
+#include <stdbool.h>
+
+struct ao_ms5607_prom {
+	uint16_t	reserved;
+	uint16_t	sens;
+	uint16_t	off;
+	uint16_t	tcs;
+	uint16_t	tco;
+	uint16_t	tref;
+	uint16_t	tempsens;
+	uint16_t	crc;
+};
+
+struct ao_ms5607_sample {
+	uint32_t	pres;	/* raw 24 bit sensor */
+	uint32_t	temp;	/* raw 24 bit sensor */
+};
+
+struct ao_ms5607_value {
+	int32_t		pres;	/* in Pa * 10 */
+	int32_t		temp;	/* in °C * 100 */
+};
+
+void
+ao_ms5607_convert(struct ao_ms5607_sample *sample, struct ao_ms5607_value *value,
+		  struct ao_ms5607_prom *prom, bool is_ms5611);
+
+#endif /* _AO_MS5607_H_ */