mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-24 19:08:50 +09:00
![Larry Johnson](/assets/img/avatar_default.png)
(1) Remove unused symbol "CFG_EEPROM_PAGE_WRITE_ENABLE". (2) Use conditional Makefile.o. Signed-off-by: Larry Johnson <lrj@acm.org>
173 lines
3.7 KiB
C
173 lines
3.7 KiB
C
/*
|
|
* (C) Copyright 2007
|
|
* Larry Johnson, lrj@acm.org
|
|
*
|
|
* based on dtt/lm75.c which is ...
|
|
*
|
|
* (C) Copyright 2001
|
|
* Bill Hunter, Wave 7 Optics, williamhunter@mediaone.net
|
|
*
|
|
* 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 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 */
|
|
|
|
int dtt_read(int sensor, int reg)
|
|
{
|
|
int dlen;
|
|
uchar 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;
|
|
}
|
|
/*
|
|
* Calculate sensor address and register.
|
|
*/
|
|
sensor = DTT_I2C_DEV_CODE + (sensor & 0x07); /* calculate LM73 addr */
|
|
/*
|
|
* Now try to read the register.
|
|
*/
|
|
if (i2c_read(sensor, reg, 1, data, dlen) != 0)
|
|
return -1;
|
|
/*
|
|
* Handle 2 byte result.
|
|
*/
|
|
if (2 == dlen)
|
|
return ((int)((short)data[1] + (((short)data[0]) << 8)));
|
|
|
|
return (int)data[0];
|
|
} /* dtt_read() */
|
|
|
|
int dtt_write(int sensor, int reg, int val)
|
|
{
|
|
int dlen;
|
|
uchar data[2];
|
|
|
|
/*
|
|
* Validate 'reg' param and handle register size
|
|
*/
|
|
switch (reg) {
|
|
case DTT_CONFIG:
|
|
case DTT_CONTROL:
|
|
dlen = 1;
|
|
data[0] = (char)(val & 0xff);
|
|
break;
|
|
case DTT_TEMP_HIGH:
|
|
case DTT_TEMP_LOW:
|
|
dlen = 2;
|
|
data[0] = (char)((val >> 8) & 0xff); /* MSB first */
|
|
data[1] = (char)(val & 0xff);
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
/*
|
|
* Calculate sensor address and register.
|
|
*/
|
|
sensor = DTT_I2C_DEV_CODE + (sensor & 0x07); /* calculate LM73 addr */
|
|
/*
|
|
* Write value to register.
|
|
*/
|
|
return i2c_write(sensor, reg, 1, data, dlen) != 0;
|
|
} /* dtt_write() */
|
|
|
|
static int _dtt_init(int 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 = CFG_DTT_MAX_TEMP << 7;
|
|
if (dtt_write(sensor, DTT_TEMP_HIGH, val))
|
|
return 1;
|
|
|
|
val = CFG_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() */
|
|
|
|
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;
|
|
} /* dtt_init() */
|
|
|
|
int dtt_get_temp(int sensor)
|
|
{
|
|
return (dtt_read(sensor, DTT_READ_TEMP) + 0x0040) >> 7;
|
|
} /* dtt_get_temp() */
|