mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-09-13 00:03:26 +09:00
![Stefan Roese](/assets/img/avatar_default.png)
On AD7414 the first value upon bootup is not read correctly. This is most likely because of the 800ms update time of the temp register in normal update mode. To get current values each time we issue the "dtt" command including upon powerup we switch into one-short mode. This patch fixes the problem on AD7414 equipped boards (Sequoia, Canyonlands etc), that temp value printed in the bootup log was incorrect. Signed-off-by: Stefan Roese <sr@denx.de>
205 lines
4.6 KiB
C
205 lines
4.6 KiB
C
/*
|
|
* (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
|
|
*/
|
|
|
|
/*
|
|
* On Semiconductor's LM75 Temperature Sensor
|
|
*/
|
|
|
|
#include <common.h>
|
|
|
|
#ifdef CONFIG_DTT_LM75
|
|
#if !defined(CFG_EEPROM_PAGE_WRITE_ENABLE) || \
|
|
(CFG_EEPROM_PAGE_WRITE_BITS < 1)
|
|
# error "CFG_EEPROM_PAGE_WRITE_ENABLE must be defined and CFG_EEPROM_PAGE_WRITE_BITS must be greater than 1 to use CONFIG_DTT_LM75"
|
|
#endif
|
|
|
|
#include <i2c.h>
|
|
#include <dtt.h>
|
|
|
|
|
|
/*
|
|
* Device code
|
|
*/
|
|
#define DTT_I2C_DEV_CODE 0x48 /* ON Semi's LM75 device */
|
|
|
|
int dtt_read(int sensor, int reg)
|
|
{
|
|
int dlen;
|
|
uchar data[2];
|
|
|
|
#ifdef CONFIG_DTT_AD7414
|
|
/*
|
|
* On AD7414 the first value upon bootup is not read correctly.
|
|
* This is most likely because of the 800ms update time of the
|
|
* temp register in normal update mode. To get current values
|
|
* each time we issue the "dtt" command including upon powerup
|
|
* we switch into one-short mode.
|
|
*
|
|
* Issue one-shot mode command
|
|
*/
|
|
dtt_write(sensor, DTT_CONFIG, 0x64);
|
|
#endif
|
|
|
|
/*
|
|
* Validate 'reg' param
|
|
*/
|
|
if((reg < 0) || (reg > 3))
|
|
return -1;
|
|
|
|
/*
|
|
* Calculate sensor address and register.
|
|
*/
|
|
sensor = DTT_I2C_DEV_CODE + (sensor & 0x07); /* calculate address of lm75 */
|
|
|
|
/*
|
|
* Prepare to handle 2 byte result.
|
|
*/
|
|
if ((reg == DTT_READ_TEMP) ||
|
|
(reg == DTT_TEMP_HYST) ||
|
|
(reg == DTT_TEMP_SET))
|
|
dlen = 2;
|
|
else
|
|
dlen = 1;
|
|
|
|
/*
|
|
* Now try to read the register.
|
|
*/
|
|
if (i2c_read(sensor, reg, 1, data, dlen) != 0)
|
|
return -1;
|
|
|
|
/*
|
|
* Handle 2 byte result.
|
|
*/
|
|
if (dlen == 2)
|
|
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
|
|
*/
|
|
if ((reg < 0) || (reg > 3))
|
|
return 1;
|
|
|
|
/*
|
|
* Calculate sensor address and register.
|
|
*/
|
|
sensor = DTT_I2C_DEV_CODE + (sensor & 0x07); /* calculate address of lm75 */
|
|
|
|
/*
|
|
* Handle 2 byte values.
|
|
*/
|
|
if ((reg == DTT_READ_TEMP) ||
|
|
(reg == DTT_TEMP_HYST) ||
|
|
(reg == DTT_TEMP_SET)) {
|
|
dlen = 2;
|
|
data[0] = (char)((val >> 8) & 0xff); /* MSB first */
|
|
data[1] = (char)(val & 0xff);
|
|
} else {
|
|
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 val;
|
|
|
|
/*
|
|
* Setup TSET ( trip point ) register
|
|
*/
|
|
val = ((CFG_DTT_MAX_TEMP * 2) << 7) & 0xff80; /* trip */
|
|
if (dtt_write(sensor, DTT_TEMP_SET, val) != 0)
|
|
return 1;
|
|
|
|
/*
|
|
* Setup THYST ( untrip point ) register - Hysteresis
|
|
*/
|
|
val = (((CFG_DTT_MAX_TEMP - CFG_DTT_HYSTERESIS) * 2) << 7) & 0xff80;
|
|
if (dtt_write(sensor, DTT_TEMP_HYST, val) != 0)
|
|
return 1;
|
|
|
|
/*
|
|
* Setup configuraton register
|
|
*/
|
|
#ifdef CONFIG_DTT_AD7414
|
|
/* config = alert active low and disabled */
|
|
val = 0x60;
|
|
#else
|
|
/* config = 6 sample integration, int mode, active low, and enable */
|
|
val = 0x18;
|
|
#endif
|
|
if (dtt_write(sensor, DTT_CONFIG, val) != 0)
|
|
return 1;
|
|
|
|
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)
|
|
{
|
|
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 / 256);
|
|
} /* dtt_get_temp() */
|
|
|
|
#endif /* CONFIG_DTT_LM75 */
|