hwmon: Add LM63 support
authorDirk Eibach <eibach@gdsys.de>
Wed, 8 Oct 2008 11:44:27 +0000 (13:44 +0200)
committerWolfgang Denk <wd@denx.de>
Sat, 18 Oct 2008 19:54:01 +0000 (21:54 +0200)
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>
drivers/hwmon/Makefile
drivers/hwmon/lm63.c [new file with mode: 0644]
include/dtt.h

index 7f7d3dbcfb8ed6d2307e7cf3719db51ce61c0ccd..59302fa4d2d10d4c87b5e35dbef6fceabbeaa214 100644 (file)
@@ -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
@@ -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;
+}
index 0c8ee76930e5538dac4c8bfc987b17cc9fdaeae8..965e82eb04fcbfae01e9e0b9b70d3fa06d383d0c 100644 (file)
@@ -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)