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Diffstat (limited to 'dtt/adm1021.c')
| -rw-r--r-- | dtt/adm1021.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/dtt/adm1021.c b/dtt/adm1021.c new file mode 100644 index 0000000..14c38f0 --- /dev/null +++ b/dtt/adm1021.c @@ -0,0 +1,171 @@ +/* + * (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: "; + + 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 */ |