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