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+/*
+ * (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 */