mirror of
https://github.com/AsahiLinux/u-boot
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8bde7f776c
- remove trailing white space, trailing empty lines, C++ comments, etc.
- split cmd_boot.c (separate cmd_bdinfo.c and cmd_load.c)
* Patches by Kenneth Johansson, 25 Jun 2003:
- major rework of command structure
(work done mostly by Michal Cendrowski and Joakim Kristiansen)
180 lines
3.9 KiB
C
180 lines
3.9 KiB
C
/*
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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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* On Semiconductor's LM75 Temperature Sensor
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*/
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#include <common.h>
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#ifdef CONFIG_DTT_LM75
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#if !defined(CFG_EEPROM_PAGE_WRITE_ENABLE) || \
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(CFG_EEPROM_PAGE_WRITE_BITS < 1)
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# error "CFG_EEPROM_PAGE_WRITE_ENABLE must be defined and CFG_EEPROM_PAGE_WRITE_BITS must be greater than 1 to use CONFIG_DTT_LM75"
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#endif
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#include <i2c.h>
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#include <dtt.h>
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/*
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* Device code
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*/
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#define DTT_I2C_DEV_CODE 0x48 /* ON Semi's LM75 device */
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int dtt_read(int sensor, int reg)
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{
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int dlen;
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uchar data[2];
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/*
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* Validate 'reg' param
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*/
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if((reg < 0) || (reg > 3))
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return -1;
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/*
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* Calculate sensor address and register.
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*/
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sensor = DTT_I2C_DEV_CODE + (sensor & 0x07); /* calculate address of lm75 */
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/*
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* Prepare to handle 2 byte result.
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*/
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if ((reg == DTT_READ_TEMP) ||
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(reg == DTT_TEMP_HYST) ||
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(reg == DTT_TEMP_SET))
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dlen = 2;
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else
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dlen = 1;
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/*
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* Now try to read the register.
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*/
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if (i2c_read(sensor, reg, 1, data, dlen) != 0)
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return -1;
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/*
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* Handle 2 byte result.
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*/
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if (dlen == 2)
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return ((int)((short)data[1] + (((short)data[0]) << 8)));
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return (int)data[0];
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} /* dtt_read() */
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int dtt_write(int sensor, int reg, int val)
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{
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int dlen;
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uchar data[2];
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/*
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* Validate 'reg' param
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*/
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if ((reg < 0) || (reg > 3))
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return 1;
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/*
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* Calculate sensor address and register.
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*/
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sensor = DTT_I2C_DEV_CODE + (sensor & 0x07); /* calculate address of lm75 */
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/*
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* Handle 2 byte values.
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*/
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if ((reg == DTT_READ_TEMP) ||
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(reg == DTT_TEMP_HYST) ||
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(reg == DTT_TEMP_SET)) {
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dlen = 2;
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data[0] = (char)((val >> 8) & 0xff); /* MSB first */
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data[1] = (char)(val & 0xff);
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} else {
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dlen = 1;
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data[0] = (char)(val & 0xff);
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}
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/*
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* Write value to register.
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*/
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if (i2c_write(sensor, reg, 1, data, dlen) != 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 _dtt_init(int sensor)
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{
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int val;
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/*
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* Setup TSET ( trip point ) register
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*/
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val = ((CFG_DTT_MAX_TEMP * 2) << 7) & 0xff80; /* trip */
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if (dtt_write(sensor, DTT_TEMP_SET, val) != 0)
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return 1;
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/*
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* Setup THYST ( untrip point ) register - Hysteresis
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*/
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val = (((CFG_DTT_MAX_TEMP - CFG_DTT_HYSTERESIS) * 2) << 7) & 0xff80;
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if (dtt_write(sensor, DTT_TEMP_HYST, val) != 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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/* config = 6 sample integration, int mode, active low, and enable */
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val = 0x18;
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if (dtt_write(sensor, DTT_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 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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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 dtt_get_temp(int sensor)
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{
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return (dtt_read(sensor, DTT_READ_TEMP) / 256);
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} /* dtt_get_temp() */
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#endif /* CONFIG_DTT_LM75 */
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