/* * (C) Copyright 2003 * Murray Jensen, CSIRO-MIT, Murray.Jensen@csiro.au * * 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 */ /* * Analog Devices's ADM1021 * "Low Cost Microprocessor System Temperature Monitor" */ #include <common.h> #ifdef CONFIG_DTT_ADM1021 #include <i2c.h> #include <dtt.h> typedef struct { uint i2c_addr:7; /* 7bit i2c chip address */ uint conv_rate:3; /* conversion rate */ uint enable_alert:1; /* enable alert output pin */ uint enable_local:1; /* enable internal temp sensor */ uint max_local:8; /* internal temp maximum */ uint min_local:8; /* internal temp minimum */ uint enable_remote:1; /* enable remote temp sensor */ uint max_remote:8; /* remote temp maximum */ uint min_remote:8; /* remote temp minimum */ } dtt_cfg_t; dtt_cfg_t dttcfg[] = CFG_DTT_ADM1021; int dtt_read (int sensor, int reg) { dtt_cfg_t *dcp = &dttcfg[sensor >> 1]; uchar data; if (i2c_read(dcp->i2c_addr, reg, 1, &data, 1) != 0) return -1; return (int)data; } /* dtt_read() */ int dtt_write (int sensor, int reg, int val) { dtt_cfg_t *dcp = &dttcfg[sensor >> 1]; uchar data; data = (uchar)(val & 0xff); if (i2c_write(dcp->i2c_addr, reg, 1, &data, 1) != 0) return 1; return 0; } /* dtt_write() */ static int _dtt_init (int sensor) { dtt_cfg_t *dcp = &dttcfg[sensor >> 1]; int reg, val; if (((sensor & 1) == 0 ? dcp->enable_local : dcp->enable_remote) == 0) return 1; /* sensor is disabled (or rather ignored) */ /* * Setup High Limit register */ if ((sensor & 1) == 0) { reg = DTT_WRITE_LOC_HIGHLIM; val = dcp->max_local; } else { reg = DTT_WRITE_REM_HIGHLIM; val = dcp->max_remote; } if (dtt_write (sensor, reg, val) != 0) return 1; /* * Setup Low Limit register */ if ((sensor & 1) == 0) { reg = DTT_WRITE_LOC_LOWLIM; val = dcp->min_local; } else { reg = DTT_WRITE_REM_LOWLIM; val = dcp->min_remote; } if (dtt_write (sensor, reg, val) != 0) return 1; /* shouldn't hurt if the rest gets done twice */ /* * Setup Conversion Rate register */ if (dtt_write (sensor, DTT_WRITE_CONVRATE, dcp->conv_rate) != 0) return 1; /* * Setup configuraton register */ val = 0; /* running */ if (dcp->enable_alert == 0) val |= DTT_CONFIG_ALERT_MASKED; /* mask ALERT pin */ if (dtt_write (sensor, DTT_WRITE_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: "; /* switch to correct I2C bus */ I2C_SET_BUS(CFG_DTT_BUS_NUM); 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) { signed char val; if ((sensor & 1) == 0) val = dtt_read(sensor, DTT_READ_LOC_VALUE); else val = dtt_read(sensor, DTT_READ_REM_VALUE); return (int) val; } /* dtt_get_temp() */ #endif /* CONFIG_DTT_ADM1021 */