/*   USBTenki - Interfacing sensors to USB 
 *   Copyright (C) 2007-2011  Raphaël Assénat <raph@raphnet.net>
 *
 *   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 3 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 "interface.h"
#include "usbtenki_cmds.h"
#include "i2c.h"
#include "adt7410.h"
#include "mcp9800.h" // For register access funcs.

static unsigned char chip_addr;

int sensors_init(void)
{
	unsigned char tmp = ADT7410_CFG_RESOLUTION_16BIT | ADT7410_CFG_OP_CONTINUOUS;

	i2c_init(I2C_FLAG_INTERNAL_PULLUP, 255);

	for (chip_addr = ADT7410_ADDR_BASE; chip_addr < ADT7410_ADDR_BASE+4; chip_addr++)
	{
		usbtenki_delay_ms(10);
		if (0 == mcp9800_writeRegister(chip_addr, ADT7410_REG_CONFIGURATION, &tmp, 1)) {
			return 0;
		}
	}

	return -1;
}

int sensors_getNumChannels(void)
{
	return 1;
}

int sensors_getChipID(unsigned char id)
{
	return USBTENKI_CHIP_ADT7410;
}

int sensors_getRaw(unsigned char id, unsigned char *dst)
{
	int res;
	res = mcp9800_readRegister(chip_addr, ADT7410_REG_TEMP_MSB, dst, 2);
	if (res)
		return res;
	return 2;
}