Add driver for National Semiconductor LM73 temperature sensor

This driver is based on the driver for the LM75.

Signed-off-by Larry Johnson <[email protected]>

---

 dtt/Makefile  |    2 +-
 dtt/lm73.c    |  186
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++ include/dtt.h |  
12 ++++-
 3 files changed, 198 insertions(+), 2 deletions(-)

dtt/Makefile +1 -1

index c6a670a..04abbaf 100644
@@ -30,7 +30,7 @@ include $(TOPDIR)/config.mk
 
 LIB	= $(obj)libdtt.a
 
-COBJS	= lm75.o ds1621.o adm1021.o lm81.o ds1775.o
+COBJS	= lm75.o ds1621.o adm1021.o lm81.o ds1775.o lm73.o
 
 SRCS	:= $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))

dtt/lm73.c new file +38 -0

new file mode 100644
index 0000000..1e0bffa
@@ -0,0 +1,186 @@
+/*
+ * (C) Copyright 2007
+ * Larry Johnson, lrj at acm.org
+ *
+ * based on dtt/lm75.c which is ...
+ *
+ * (C) Copyright 2001
+ * Bill Hunter,  Wave 7 Optics, williamhunter at mediaone.net
+ *
+ * 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
+ */
+
+/*
+ * National Semiconductor LM73 Temperature Sensor
+ */
+
+#include <common.h>
+
+#ifdef CONFIG_DTT_LM73
+#if !defined(CFG_EEPROM_PAGE_WRITE_ENABLE) || \
+	(CFG_EEPROM_PAGE_WRITE_BITS < 1)
+# error "CFG_EEPROM_PAGE_WRITE_ENABLE must be defined and

CFG_EEPROM_PAGE_WRITE_BITS must be greater than 1 to use CONFIG_DTT_LM73"

dtt/lm73.c new file +32 -0

+#endif
+
+#include <i2c.h>
+#include <dtt.h>
+
+/*
+ * Device code
+ */
+#define DTT_I2C_DEV_CODE 0x48	/* National Semi's LM73 device */
+
+int dtt_read(int sensor, int reg)
+{
+	int dlen;
+	uchar data[2];
+
+	/*
+	 * Validate 'reg' param and get register size.
+	 */
+	switch (reg) {
+	case DTT_CONFIG:
+	case DTT_CONTROL:
+		dlen = 1;
+		break;
+	case DTT_READ_TEMP:
+	case DTT_TEMP_HIGH:
+	case DTT_TEMP_LOW:
+	case DTT_ID:
+		dlen = 2;
+		break;
+	default:
+		return -1;
+	}