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hwmon: Extend lm63.c to support LM64 

This patch adds support for the National LM64 temperature
sensor with integrated fan control to lm63.c.
Main difference between LM63 and LM64 is 16°C offset in sensor
readings.

Signed-off-by: Dirk Eibach <eibach@gdsys.de>
This commit is contained in:
Dirk Eibach 2011-04-18 10:43:14 +02:00 committed by Wolfgang Denk
parent bbc6353c74
commit 31c1bdd93d
1 changed files with 24 additions and 4 deletions
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28
drivers/hwmon/lm63.c
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@ -23,14 +23,15 @@
*/
/*
* National LM63 Temperature Sensor
* National LM63/LM64 Temperature Sensor
* Main difference: LM 64 has -16 Kelvin temperature offset
*/
#include <common.h>
#include <i2c.h>
#include <dtt.h>
#define DTT_I2C_DEV_CODE 0x4C /* National LM63 device */
#define DTT_I2C_LM63_ADDR 0x4C /* National LM63 device */
#define DTT_READ_TEMP_RMT_MSB 0x01
#define DTT_CONFIG 0x03
@ -58,7 +59,8 @@ int dtt_read(int sensor, int reg)
/*
* Calculate sensor address and register.
*/
sensor = DTT_I2C_DEV_CODE; /* address of lm63 is not adjustable */
if (!sensor)
sensor = DTT_I2C_LM63_ADDR; /* legacy config */
dlen = 1;
@ -79,7 +81,8 @@ int dtt_write(int sensor, int reg, int val)
/*
* Calculate sensor address and register.
*/
sensor = DTT_I2C_DEV_CODE; /* address of lm63 is not adjustable */
if (!sensor)
sensor = DTT_I2C_LM63_ADDR; /* legacy config */
dlen = 1;
data[0] = (char)(val & 0xff);
@ -93,6 +96,11 @@ int dtt_write(int sensor, int reg, int val)
return 0;
} /* dtt_write() */
static int is_lm64(int sensor)
{
return sensor && (sensor != DTT_I2C_LM63_ADDR);
}
static int _dtt_init(int sensor)
{
int i;
@ -116,6 +124,12 @@ static int _dtt_init(int sensor)
if (dtt_write(sensor, DTT_TACHLIM_MSB, (val >> 8) & 0xff) != 0)
return 1;
/*
* Make sure PWM Lookup-Table is writeable
*/
if (dtt_write(sensor, DTT_FAN_CONFIG, 0x20) != 0)
return 1;
/*
* Setup PWM Lookup-Table
*/
@ -123,8 +137,11 @@ static int _dtt_init(int sensor)
i++) {
int address = DTT_PWM_LOOKUP_BASE + 2 * i;
val = pwm_lookup[i].temp;
if (is_lm64(sensor))
val -= 16;
if (dtt_write(sensor, address, val) != 0)
return 1;
val = dtt_read(sensor, address);
val = pwm_lookup[i].pwm;
if (dtt_write(sensor, address + 1, val) != 0)
return 1;
@ -152,6 +169,9 @@ 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));
if (is_lm64(sensor))
temp += 16 << 8;
/* Ignore LSB for now, U-Boot only prints natural numbers */
return temp >> 8;
}