/*
- * (C) Copyright 2007
+ * (C) Copyright 2007-2008
* Larry Johnson, lrj@acm.org
*
* 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
+ * SPDX-License-Identifier: GPL-2.0+
*/
/*
*/
#include <common.h>
-
-#ifdef CONFIG_DTT_LM73
-#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_LM73"
-#endif
-
#include <i2c.h>
#include <dtt.h>
* Device code
*/
#define DTT_I2C_DEV_CODE 0x48 /* National Semi's LM73 device */
-
-int dtt_read(int sensor, int reg)
+#define DTT_READ_TEMP 0x0
+#define DTT_CONFIG 0x1
+#define DTT_TEMP_HIGH 0x2
+#define DTT_TEMP_LOW 0x3
+#define DTT_CONTROL 0x4
+#define DTT_ID 0x7
+
+int dtt_read(int const sensor, int const reg)
{
int dlen;
- uchar data[2];
+ uint8_t data[2];
/*
* Validate 'reg' param and get register size.
return -1;
}
/*
- * Calculate sensor address and register.
- */
- sensor = DTT_I2C_DEV_CODE + (sensor & 0x07); /* calculate LM73 addr */
- /*
- * Now try to read the register.
+ * Try to read the register at the calculated sensor address.
*/
- if (i2c_read(sensor, reg, 1, data, dlen) != 0)
+ if (0 !=
+ i2c_read(DTT_I2C_DEV_CODE + (sensor & 0x07), reg, 1, data, dlen))
return -1;
/*
* Handle 2 byte result.
*/
if (2 == dlen)
- return ((int)((short)data[1] + (((short)data[0]) << 8)));
+ return (int)((unsigned)data[0] << 8 | (unsigned)data[1]);
return (int)data[0];
} /* dtt_read() */
-int dtt_write(int sensor, int reg, int val)
+int dtt_write(int const sensor, int const reg, int const val)
{
int dlen;
- uchar data[2];
+ uint8_t data[2];
/*
* Validate 'reg' param and handle register size
case DTT_CONFIG:
case DTT_CONTROL:
dlen = 1;
- data[0] = (char)(val & 0xff);
+ data[0] = (uint8_t) val;
break;
case DTT_TEMP_HIGH:
case DTT_TEMP_LOW:
dlen = 2;
- data[0] = (char)((val >> 8) & 0xff); /* MSB first */
- data[1] = (char)(val & 0xff);
+ data[0] = (uint8_t) (val >> 8); /* MSB first */
+ data[1] = (uint8_t) val;
break;
default:
return -1;
}
/*
- * Calculate sensor address and register.
- */
- sensor = DTT_I2C_DEV_CODE + (sensor & 0x07); /* calculate LM73 addr */
- /*
- * Write value to register.
+ * Write value to register at the calculated sensor address.
*/
- return i2c_write(sensor, reg, 1, data, dlen) != 0;
+ return 0 != i2c_write(DTT_I2C_DEV_CODE + (sensor & 0x07), reg, 1, data,
+ dlen);
} /* dtt_write() */
-static int _dtt_init(int sensor)
+int dtt_init_one(int const sensor)
{
int val;
* Validate the Identification register
*/
if (0x0190 != dtt_read(sensor, DTT_ID))
- return 1;
+ return -1;
/*
* Setup THIGH (upper-limit) and TLOW (lower-limit) registers
*/
- val = CFG_DTT_MAX_TEMP << 7;
+ val = CONFIG_SYS_DTT_MAX_TEMP << 7;
if (dtt_write(sensor, DTT_TEMP_HIGH, val))
- return 1;
+ return -1;
- val = CFG_DTT_MIN_TEMP << 7;
+ val = CONFIG_SYS_DTT_MIN_TEMP << 7;
if (dtt_write(sensor, DTT_TEMP_LOW, val))
- return 1;
+ return -1;
/*
* Setup configuraton register
*/
/* config = alert active low, disabled, and reset */
val = 0x64;
if (dtt_write(sensor, DTT_CONFIG, val))
- return 1;
+ return -1;
/*
* Setup control/status register
*/
/* control = temp resolution 0.25C */
val = 0x00;
if (dtt_write(sensor, DTT_CONTROL, val))
- return 1;
+ return -1;
dtt_read(sensor, DTT_CONTROL); /* clear temperature flags */
return 0;
-} /* _dtt_init() */
+} /* dtt_init_one() */
-int dtt_init(void)
+int dtt_get_temp(int const sensor)
{
- int i;
- unsigned char sensors[] = CONFIG_DTT_SENSORS;
- const char *const header = "DTT: ";
+ int const ret = dtt_read(sensor, DTT_READ_TEMP);
- 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]));
+ if (ret < 0) {
+ printf("DTT temperature read failed.\n");
+ return 0;
}
- return 0;
-} /* dtt_init() */
-
-int dtt_get_temp(int sensor)
-{
- return (dtt_read(sensor, DTT_READ_TEMP) + 0x0040) >> 7;
+ return (int)((int16_t) ret + 0x0040) >> 7;
} /* dtt_get_temp() */
-
-#endif /* CONFIG_DTT_LM73 */
projects / karo-tx-uboot.git / blobdiff