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Diffstat (limited to 'dtt/lm81.c')
| -rw-r--r-- | dtt/lm81.c | 148 |
1 files changed, 0 insertions, 148 deletions
diff --git a/dtt/lm81.c b/dtt/lm81.c deleted file mode 100644 index 03bc53d..0000000 --- a/dtt/lm81.c +++ /dev/null @@ -1,148 +0,0 @@ -/* - * (C) Copyright 2006 - * Heiko Schocher, DENX Software Enginnering <hs@denx.de> - * - * 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 - */ - -/* - * On Semiconductor's LM81 Temperature Sensor - */ - -#include <common.h> - -#ifdef CONFIG_DTT_LM81 -#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_LM81" -#endif - -#include <i2c.h> -#include <dtt.h> - -/* - * Device code - */ -#define DTT_I2C_DEV_CODE 0x2c /* ON Semi's LM81 device */ - -int dtt_read(int sensor, int reg) -{ - int dlen = 1; - uchar data[2]; - - /* - * Calculate sensor address and register. - */ - sensor = DTT_I2C_DEV_CODE + (sensor & 0x03); /* calculate address of lm81 */ - - /* - * Now try to read the register. - */ - if (i2c_read(sensor, reg, 1, data, dlen) != 0) - return -1; - - return (int)data[0]; -} /* dtt_read() */ - - -int dtt_write(int sensor, int reg, int val) -{ - uchar data; - - /* - * Calculate sensor address and register. - */ - sensor = DTT_I2C_DEV_CODE + (sensor & 0x03); /* calculate address of lm81 */ - - data = (char)(val & 0xff); - - /* - * Write value to register. - */ - if (i2c_write(sensor, reg, 1, &data, 1) != 0) - return 1; - - return 0; -} /* dtt_write() */ - -#define DTT_MANU 0x3e -#define DTT_REV 0x3f -#define DTT_CONFIG 0x40 -#define DTT_ADR 0x48 - -static int _dtt_init(int sensor) -{ - int man; - int adr; - int rev; - - if (dtt_write (sensor, DTT_CONFIG, 0x01) < 0) - return 1; - /* The LM81 needs 400ms to get the correct values ... */ - udelay (400000); - man = dtt_read (sensor, DTT_MANU); - if (man != 0x01) - return 1; - adr = dtt_read (sensor, DTT_ADR); - if (adr < 0) - return 1; - rev = dtt_read (sensor, DTT_REV); - if (adr < 0) - return 1; - - printf ("DTT: Found LM81@%x Rev: %d\n", adr, rev); - 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() */ - -#define TEMP_FROM_REG(temp) \ - ((temp)<256?((((temp)&0x1fe) >> 1) * 10) + ((temp) & 1) * 5: \ - ((((temp)&0x1fe) >> 1) -255) * 10 - ((temp) & 1) * 5) \ - -int dtt_get_temp(int sensor) -{ - int val = dtt_read (sensor, DTT_READ_TEMP); - int tmpcnf = dtt_read (sensor, DTT_CONFIG_TEMP); - - return (TEMP_FROM_REG((val << 1) + ((tmpcnf & 0x80) >> 7))) / 10; -} /* dtt_get_temp() */ - -#endif /* CONFIG_DTT_LM81 */ |