NetBSD/sys/dev/i2c/i2c_eeprom.c

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2001-11-13 15:24:11 +03:00
/* $NetBSD: i2c_eeprom.c,v 1.2 2001/11/13 12:25:27 lukem Exp $ */
/*
* Copyright (c) 1997 Manuel Bouyer. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Manuel Bouyer.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* driver for Microchip Technology, 24C01A/02A/04A eeproms
* Data Sheet available from www.microchip.com
*/
2001-11-13 15:24:11 +03:00
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: i2c_eeprom.c,v 1.2 2001/11/13 12:25:27 lukem Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <dev/i2c/i2c_bus.h>
#include <dev/i2c/i2c_eeprom.h>
int i2c_eeprom_read(adapter, addr)
i2c_adapter_t * adapter;
u_int8_t addr;
{
int retval;
i2c_send_start(adapter);
if (i2c_write_byte(adapter, 0xa0) != 0) {
#if I2C_DEBUG
printf("i2c_eeprom_read: write 0xa0\n");
#endif
return -1;
}
if (i2c_write_byte(adapter, addr) != 0) {
#if I2C_DEBUG
printf("i2c_eeprom_read: write addr\n");
#endif
return -1;
}
i2c_send_start(adapter);
if (i2c_write_byte(adapter, 0xa1) != 0) {
#if I2C_DEBUG
printf("i2c_eeprom_read: write 0xa1\n");
#endif
return -1;
}
retval = i2c_read_byte(adapter);
i2c_send_stop(adapter);
return retval;
}