adt7460.c

来自「最新版的u-boot,2008-10-18发布」· C语言 代码 · 共 84 行

/*
 * (C) Copyright 2008
 * Ricado Ribalda-Universidad Autonoma de Madrid, [e-mail]
 * This work has been supported by: QTechnology  http://qtec.com/
 * 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, see <http://www.gnu.org/licenses/>.
*/

#include <common.h>
#include <i2c.h>
#include <dtt.h>

#define ADT7460_ADDRESS		0x2c
#define ADT7460_INVALID		128
#define ADT7460_CONFIG		0x40
#define ADT7460_REM1_TEMP	0x25
#define ADT7460_LOCAL_TEMP	0x26
#define ADT7460_REM2_TEMP	0x27

int dtt_read(int sensor, int reg)
{
	u8 dir = reg;
	u8 data;

	if (i2c_read(ADT7460_ADDRESS, dir, 1, &data, 1) == -1)
		return -1;
	if (data == ADT7460_INVALID)
		return -1;

	return data;
}

int dtt_write(int sensor, int reg, int val)
{
	u8 dir = reg;
	u8 data = val;

	if (i2c_write(ADT7460_ADDRESS, dir, 1, &data, 1) == -1)
		return -1;

	return 0;
}

int dtt_init(void)
{
	printf("ADT7460 at I2C address 0x%2x\n", ADT7460_ADDRESS);

	if (dtt_write(0, ADT7460_CONFIG, 1) == -1) {
		puts("Error initialiting ADT7460\n");
		return -1;
	}

	return 0;
}

int dtt_get_temp(int sensor)
{
	int aux;
	u8 table[] =
	    { ADT7460_REM1_TEMP, ADT7460_LOCAL_TEMP, ADT7460_REM2_TEMP };

	if (sensor > 2) {
		puts("DTT sensor does not exist\n");
		return -1;
	}

	aux = dtt_read(0, table[sensor]);
	if (aux == -1) {
		puts("DTT temperature read failed\n");
		return -1;
	}

	return aux;
}