mirror of
https://github.com/AsahiLinux/u-boot
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174 lines
3.8 KiB
C
174 lines
3.8 KiB
C
/*
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* (C) Copyright 2003
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* Murray Jensen, CSIRO-MIT, Murray.Jensen@csiro.au
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*
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* based on dtt/lm75.c which is ...
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*
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* (C) Copyright 2001
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* Bill Hunter, Wave 7 Optics, williamhunter@mediaone.net
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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/*
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* Analog Devices's ADM1021
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* "Low Cost Microprocessor System Temperature Monitor"
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*/
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#include <common.h>
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#ifdef CONFIG_DTT_ADM1021
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#include <i2c.h>
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#include <dtt.h>
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typedef
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struct {
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uint i2c_addr:7; /* 7bit i2c chip address */
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uint conv_rate:3; /* conversion rate */
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uint enable_alert:1; /* enable alert output pin */
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uint enable_local:1; /* enable internal temp sensor */
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uint max_local:8; /* internal temp maximum */
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uint min_local:8; /* internal temp minimum */
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uint enable_remote:1; /* enable remote temp sensor */
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uint max_remote:8; /* remote temp maximum */
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uint min_remote:8; /* remote temp minimum */
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}
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dtt_cfg_t;
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dtt_cfg_t dttcfg[] = CFG_DTT_ADM1021;
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int
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dtt_read (int sensor, int reg)
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{
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dtt_cfg_t *dcp = &dttcfg[sensor >> 1];
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uchar data;
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if (i2c_read(dcp->i2c_addr, reg, 1, &data, 1) != 0)
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return -1;
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return (int)data;
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} /* dtt_read() */
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int
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dtt_write (int sensor, int reg, int val)
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{
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dtt_cfg_t *dcp = &dttcfg[sensor >> 1];
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uchar data;
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data = (uchar)(val & 0xff);
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if (i2c_write(dcp->i2c_addr, reg, 1, &data, 1) != 0)
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return 1;
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return 0;
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} /* dtt_write() */
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static int
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_dtt_init (int sensor)
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{
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dtt_cfg_t *dcp = &dttcfg[sensor >> 1];
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int reg, val;
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if (((sensor & 1) == 0 ? dcp->enable_local : dcp->enable_remote) == 0)
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return 1; /* sensor is disabled (or rather ignored) */
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/*
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* Setup High Limit register
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*/
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if ((sensor & 1) == 0) {
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reg = DTT_WRITE_LOC_HIGHLIM;
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val = dcp->max_local;
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}
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else {
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reg = DTT_WRITE_REM_HIGHLIM;
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val = dcp->max_remote;
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}
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if (dtt_write (sensor, reg, val) != 0)
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return 1;
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/*
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* Setup Low Limit register
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*/
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if ((sensor & 1) == 0) {
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reg = DTT_WRITE_LOC_LOWLIM;
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val = dcp->min_local;
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}
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else {
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reg = DTT_WRITE_REM_LOWLIM;
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val = dcp->min_remote;
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}
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if (dtt_write (sensor, reg, val) != 0)
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return 1;
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/* shouldn't hurt if the rest gets done twice */
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/*
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* Setup Conversion Rate register
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*/
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if (dtt_write (sensor, DTT_WRITE_CONVRATE, dcp->conv_rate) != 0)
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return 1;
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/*
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* Setup configuraton register
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*/
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val = 0; /* running */
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if (dcp->enable_alert == 0)
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val |= DTT_CONFIG_ALERT_MASKED; /* mask ALERT pin */
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if (dtt_write (sensor, DTT_WRITE_CONFIG, val) != 0)
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return 1;
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return 0;
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} /* _dtt_init() */
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int
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dtt_init (void)
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{
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int i;
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unsigned char sensors[] = CONFIG_DTT_SENSORS;
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const char *const header = "DTT: ";
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/* switch to correct I2C bus */
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I2C_SET_BUS(CFG_DTT_BUS_NUM);
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for (i = 0; i < sizeof(sensors); i++) {
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if (_dtt_init(sensors[i]) != 0)
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printf ("%s%d FAILED INIT\n", header, i+1);
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else
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printf ("%s%d is %i C\n", header, i+1,
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dtt_get_temp(sensors[i]));
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}
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return (0);
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} /* dtt_init() */
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int
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dtt_get_temp (int sensor)
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{
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signed char val;
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if ((sensor & 1) == 0)
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val = dtt_read(sensor, DTT_READ_LOC_VALUE);
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else
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val = dtt_read(sensor, DTT_READ_REM_VALUE);
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return (int) val;
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} /* dtt_get_temp() */
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#endif /* CONFIG_DTT_ADM1021 */
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