Mirrors/u-boot
2
0
Fork 0
mirror of https://github.com/AsahiLinux/u-boot synced 2024-11-25 14:10:43 +00:00
Code Issues Projects Releases Packages Wiki Activity

hwmon: Extend lm63.c to support LM64

Browse source 
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
Show stats Download patch file Download diff file Expand all files Collapse all files

28
drivers/hwmon/lm63.c
View file

@ -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;
}