Add support for ADT7460 I2C monitor chip

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@uam.es>

drivers/hwmon/Makefile

@@ -37,6 +37,7 @@ COBJS-$(CONFIG_DTT_DS1775) += ds1775.o
 COBJS-$(CONFIG_DTT_LM73) += lm73.o
 COBJS-$(CONFIG_DTT_LM75) += lm75.o
 COBJS-$(CONFIG_DTT_LM81) += lm81.o
+COBJS-$(CONFIG_DTT_ADT7460) += adt7460.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)

drivers/hwmon/adt7460.c

@@ -0,0 +1,83 @@
+/*
+ * (C) Copyright 2008
+ * Ricado Ribalda-Universidad Autonoma de Madrid, ricardo.ribalda@uam.es
+ * This work has been supported by: QTechnology  http://qtec.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, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <common.h>
+#include <i2c.h>
+#include <dtt.h>
+
+#define ADT7460_ADDRESS		0x2c
+#define ADT7460_INVALID		128
+#define ADT7460_CONFIG		0x40
+#define ADT7460_REM1_TEMP	0x25
+#define ADT7460_LOCAL_TEMP	0x26
+#define ADT7460_REM2_TEMP	0x27
+
+int dtt_read(int sensor, int reg)
+{
+	u8 dir = reg;
+	u8 data;
+
+	if (i2c_read(ADT7460_ADDRESS, dir, 1, &data, 1) == -1)
+		return -1;
+	if (data == ADT7460_INVALID)
+		return -1;
+
+	return data;
+}
+
+int dtt_write(int sensor, int reg, int val)
+{
+	u8 dir = reg;
+	u8 data = val;
+
+	if (i2c_write(ADT7460_ADDRESS, dir, 1, &data, 1) == -1)
+		return -1;
+
+	return 0;
+}
+
+int dtt_init(void)
+{
+	printf("ADT7460 at I2C address 0x%2x\n", ADT7460_ADDRESS);
+
+	if (dtt_write(0, ADT7460_CONFIG, 1) == -1) {
+		puts("Error initialiting ADT7460\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+int dtt_get_temp(int sensor)
+{
+	int aux;
+	u8 table[] =
+	    { ADT7460_REM1_TEMP, ADT7460_LOCAL_TEMP, ADT7460_REM2_TEMP };
+
+	if (sensor > 2) {
+		puts("DTT sensor does not exist\n");
+		return -1;
+	}
+
+	aux = dtt_read(0, table[sensor]);
+	if (aux == -1) {
+		puts("DTT temperature read failed\n");
+		return -1;
+	}
+
+	return aux;
+}

include/dtt.h

@@ -32,7 +32,8 @@
     defined(CONFIG_DTT_DS1775) || \
     defined(CONFIG_DTT_LM81) || \
     defined(CONFIG_DTT_ADM1021) || \
-    defined(CONFIG_DTT_LM73)
+    defined(CONFIG_DTT_LM73) || \
+    defined(CONFIG_DTT_ADT7460)
 
 #define CONFIG_DTT				/* We have a DTT */