mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-27 07:01:24 +00:00
1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
146 lines
2.8 KiB
C
146 lines
2.8 KiB
C
/*
|
|
* (C) Copyright 2007-2008
|
|
* Larry Johnson, lrj@acm.org
|
|
*
|
|
* based on dtt/lm75.c which is ...
|
|
*
|
|
* (C) Copyright 2001
|
|
* Bill Hunter, Wave 7 Optics, williamhunter@mediaone.net
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
/*
|
|
* National Semiconductor LM73 Temperature Sensor
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <i2c.h>
|
|
#include <dtt.h>
|
|
|
|
/*
|
|
* Device code
|
|
*/
|
|
#define DTT_I2C_DEV_CODE 0x48 /* National Semi's LM73 device */
|
|
#define DTT_READ_TEMP 0x0
|
|
#define DTT_CONFIG 0x1
|
|
#define DTT_TEMP_HIGH 0x2
|
|
#define DTT_TEMP_LOW 0x3
|
|
#define DTT_CONTROL 0x4
|
|
#define DTT_ID 0x7
|
|
|
|
int dtt_read(int const sensor, int const reg)
|
|
{
|
|
int dlen;
|
|
uint8_t data[2];
|
|
|
|
/*
|
|
* Validate 'reg' param and get register size.
|
|
*/
|
|
switch (reg) {
|
|
case DTT_CONFIG:
|
|
case DTT_CONTROL:
|
|
dlen = 1;
|
|
break;
|
|
case DTT_READ_TEMP:
|
|
case DTT_TEMP_HIGH:
|
|
case DTT_TEMP_LOW:
|
|
case DTT_ID:
|
|
dlen = 2;
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
/*
|
|
* Try to read the register at the calculated sensor address.
|
|
*/
|
|
if (0 !=
|
|
i2c_read(DTT_I2C_DEV_CODE + (sensor & 0x07), reg, 1, data, dlen))
|
|
return -1;
|
|
/*
|
|
* Handle 2 byte result.
|
|
*/
|
|
if (2 == dlen)
|
|
return (int)((unsigned)data[0] << 8 | (unsigned)data[1]);
|
|
|
|
return (int)data[0];
|
|
} /* dtt_read() */
|
|
|
|
int dtt_write(int const sensor, int const reg, int const val)
|
|
{
|
|
int dlen;
|
|
uint8_t data[2];
|
|
|
|
/*
|
|
* Validate 'reg' param and handle register size
|
|
*/
|
|
switch (reg) {
|
|
case DTT_CONFIG:
|
|
case DTT_CONTROL:
|
|
dlen = 1;
|
|
data[0] = (uint8_t) val;
|
|
break;
|
|
case DTT_TEMP_HIGH:
|
|
case DTT_TEMP_LOW:
|
|
dlen = 2;
|
|
data[0] = (uint8_t) (val >> 8); /* MSB first */
|
|
data[1] = (uint8_t) val;
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
/*
|
|
* Write value to register at the calculated sensor address.
|
|
*/
|
|
return 0 != i2c_write(DTT_I2C_DEV_CODE + (sensor & 0x07), reg, 1, data,
|
|
dlen);
|
|
} /* dtt_write() */
|
|
|
|
int dtt_init_one(int const sensor)
|
|
{
|
|
int val;
|
|
|
|
/*
|
|
* Validate the Identification register
|
|
*/
|
|
if (0x0190 != dtt_read(sensor, DTT_ID))
|
|
return -1;
|
|
/*
|
|
* Setup THIGH (upper-limit) and TLOW (lower-limit) registers
|
|
*/
|
|
val = CONFIG_SYS_DTT_MAX_TEMP << 7;
|
|
if (dtt_write(sensor, DTT_TEMP_HIGH, val))
|
|
return -1;
|
|
|
|
val = CONFIG_SYS_DTT_MIN_TEMP << 7;
|
|
if (dtt_write(sensor, DTT_TEMP_LOW, val))
|
|
return -1;
|
|
/*
|
|
* Setup configuraton register
|
|
*/
|
|
/* config = alert active low, disabled, and reset */
|
|
val = 0x64;
|
|
if (dtt_write(sensor, DTT_CONFIG, val))
|
|
return -1;
|
|
/*
|
|
* Setup control/status register
|
|
*/
|
|
/* control = temp resolution 0.25C */
|
|
val = 0x00;
|
|
if (dtt_write(sensor, DTT_CONTROL, val))
|
|
return -1;
|
|
|
|
dtt_read(sensor, DTT_CONTROL); /* clear temperature flags */
|
|
return 0;
|
|
} /* dtt_init_one() */
|
|
|
|
int dtt_get_temp(int const sensor)
|
|
{
|
|
int const ret = dtt_read(sensor, DTT_READ_TEMP);
|
|
|
|
if (ret < 0) {
|
|
printf("DTT temperature read failed.\n");
|
|
return 0;
|
|
}
|
|
return (int)((int16_t) ret + 0x0040) >> 7;
|
|
} /* dtt_get_temp() */
|