hwmon: Add LM63 support

This patch adds support for the National LM63 temperature
sensor with integrated fan control. It's used on the GDSys
Neo board (405EP) which will be submitted later.

Signed-off-by: Dirk Eibach <eibach@gdsys.de>
Acked-by: Stefan Roese <sr@denx.de>

diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 7f7d3dbcfb8ed6d2307e7cf3719db51ce61c0ccd..59302fa4d2d10d4c87b5e35dbef6fceabbeaa214 100644 (file)
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -35,6 +35,7 @@ COBJS-$(CONFIG_DTT_ADT7460) += adt7460.o
 COBJS-$(CONFIG_DTT_DS1621) += ds1621.o
 COBJS-$(CONFIG_DTT_DS1722) += ds1722.o
 COBJS-$(CONFIG_DTT_DS1775) += ds1775.o
+COBJS-$(CONFIG_DTT_LM63) += lm63.o
 COBJS-$(CONFIG_DTT_LM73) += lm73.o
 COBJS-$(CONFIG_DTT_LM75) += lm75.o
 COBJS-$(CONFIG_DTT_LM81) += lm81.o

diff --git a/drivers/hwmon/lm63.c b/drivers/hwmon/lm63.c
new file mode 100644 (file)
index 0000000..03616e1
--- /dev/null
+++ b/drivers/hwmon/lm63.c
@@ -0,0 +1,174 @@
+/*
+ * (C) Copyright 2007-2008
+ * Dirk Eibach,  Guntermann & Drunck GmbH, eibach@gdsys.de
+ * based on lm75.c by Bill Hunter
+ *
+ * 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 LM63 Temperature Sensor
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <dtt.h>
+
+#define DTT_I2C_DEV_CODE 0x4C  /* National LM63 device */
+
+#define DTT_READ_TEMP_RMT_MSB  0x01
+#define DTT_CONFIG             0x03
+#define DTT_READ_TEMP_RMT_LSB  0x10
+#define DTT_TACHLIM_LSB                0x48
+#define DTT_TACHLIM_MSB                0x49
+#define DTT_FAN_CONFIG         0x4A
+#define DTT_PWM_FREQ           0x4D
+#define DTT_PWM_LOOKUP_BASE    0x50
+
+struct pwm_lookup_entry {
+       u8 temp;
+       u8 pwm;
+};
+
+/*
+ * Device code
+ */
+
+int dtt_read(int sensor, int reg)
+{
+       int dlen;
+       uchar data[2];
+
+       /*
+        * Calculate sensor address and register.
+        */
+       sensor = DTT_I2C_DEV_CODE;      /* address of lm63 is not adjustable */
+
+       dlen = 1;
+
+       /*
+        * Now try to read the register.
+        */
+       if (i2c_read(sensor, reg, 1, data, dlen) != 0)
+               return -1;
+
+       return (int)data[0];
+}                              /* dtt_read() */
+
+int dtt_write(int sensor, int reg, int val)
+{
+       int dlen;
+       uchar data[2];
+
+       /*
+        * Calculate sensor address and register.
+        */
+       sensor = DTT_I2C_DEV_CODE;      /* address of lm63 is not adjustable */
+
+       dlen = 1;
+       data[0] = (char)(val & 0xff);
+
+       /*
+        * Write value to register.
+        */
+       if (i2c_write(sensor, reg, 1, data, dlen) != 0)
+               return 1;
+
+       return 0;
+}                              /* dtt_write() */
+
+static int _dtt_init(int sensor)
+{
+       int i;
+       int val;
+
+       struct pwm_lookup_entry pwm_lookup[] = CONFIG_DTT_PWM_LOOKUPTABLE;
+
+       /*
+        * Set PWM Frequency to 2.5% resolution
+        */
+       val = 20;
+       if (dtt_write(sensor, DTT_PWM_FREQ, val) != 0)
+               return 1;
+
+       /*
+        * Set Tachometer Limit
+        */
+       val = CONFIG_DTT_TACH_LIMIT;
+       if (dtt_write(sensor, DTT_TACHLIM_LSB, val & 0xff) != 0)
+               return 1;
+       if (dtt_write(sensor, DTT_TACHLIM_MSB, (val >> 8) & 0xff) != 0)
+               return 1;
+
+       /*
+        * Setup PWM Lookup-Table
+        */
+       for (i = 0; i < sizeof(pwm_lookup) / sizeof(struct pwm_lookup_entry);
+            i++) {
+               int address = DTT_PWM_LOOKUP_BASE + 2 * i;
+               val = pwm_lookup[i].temp;
+               if (dtt_write(sensor, address, val) != 0)
+                       return 1;
+               val = pwm_lookup[i].pwm;
+               if (dtt_write(sensor, address + 1, val) != 0)
+                       return 1;
+       }
+
+       /*
+        * Enable PWM Lookup-Table, PWM Clock 360 kHz, Tachometer Mode 2
+        */
+       val = 0x02;
+       if (dtt_write(sensor, DTT_FAN_CONFIG, val) != 0)
+               return 1;
+
+       /*
+        * Enable Tach input
+        */
+       val = dtt_read(sensor, DTT_CONFIG) | 0x04;
+       if (dtt_write(sensor, DTT_CONFIG, val) != 0)
+               return 1;
+
+       return 0;
+}
+
+int dtt_get_temp(int sensor)
+{
+       s16 temp = (dtt_read(sensor, DTT_READ_TEMP_RMT_MSB) << 8)
+           | (dtt_read(sensor, DTT_READ_TEMP_RMT_LSB));
+
+       /* Ignore LSB for now, U-Boot only prints natural numbers */
+       return temp >> 8;
+}
+
+int dtt_init(void)
+{
+       int i;
+       unsigned char sensors[] = CONFIG_DTT_SENSORS;
+       const char *const header = "DTT:   ";
+
+       for (i = 0; i < sizeof(sensors); i++) {
+               if (_dtt_init(sensors[i]) != 0)
+                       printf("%s%d FAILED INIT\n", header, i + 1);
+               else
+                       printf("%s%d is %i C\n", header, i + 1,
+                              dtt_get_temp(sensors[i]));
+       }
+
+       return 0;
+}

diff --git a/include/dtt.h b/include/dtt.h
index 0c8ee76930e5538dac4c8bfc987b17cc9fdaeae8..965e82eb04fcbfae01e9e0b9b70d3fa06d383d0c 100644 (file)
--- a/include/dtt.h
+++ b/include/dtt.h
@@ -31,6 +31,7 @@
     defined(CONFIG_DTT_ADT7460)        || \
     defined(CONFIG_DTT_DS1621) || \
     defined(CONFIG_DTT_DS1775) || \
+    defined(CONFIG_DTT_LM63)   || \
     defined(CONFIG_DTT_LM73)   || \
     defined(CONFIG_DTT_LM75)   || \
     defined(CONFIG_DTT_LM81)