1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright (c) 2000 by Sun Microsystems, Inc. 24 * All rights reserved. 25 */ 26 27 #ifndef _PCF8574_IMPL_H 28 #define _PCF8574_IMPL_H 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #ifdef __cplusplus 33 extern "C" { 34 #endif 35 36 #include <sys/i2c/clients/i2c_client.h> 37 38 /* 39 * PCF8574_BIT_READ_MASK takes in a byte from the device and the bit that 40 * the user wants to read. I shifts the byte over so that the bit that we 41 * want is in the 1's bit and masks out the rest of the byte. 42 */ 43 #define PCF8574_BIT_READ_MASK(byte, bit) ((byte >> bit) & 0x01) 44 45 /* 46 * PCF8574_BIT_WRITE_MASK takes in a byte from the device, the bit that the 47 * user wants to read write, and the value that the user wants put into that 48 * bit. It zero's out the bit that we are writing to in the byte and then or's 49 * the value(which was shifted to the bit location we wanted) to fill in only 50 * that bit in the byte 51 */ 52 #define PCF8574_BIT_WRITE_MASK(byte, bit, value)\ 53 ((value << bit) | (byte & (~(0x01 << bit)))) 54 55 struct pcf8574_unit { 56 kmutex_t pcf8574_mutex; 57 uint8_t pcf8574_flags; 58 int pcf8574_oflag; 59 i2c_client_hdl_t pcf8574_hdl; 60 char pcf8574_name[24]; 61 }; 62 63 #ifdef DEBUG 64 65 static int pcf8574debug = 0; 66 #define D1CMN_ERR(ARGS) if (pcf8574debug & 0x1) cmn_err ARGS; 67 #define D2CMN_ERR(ARGS) if (pcf8574debug & 0x2) cmn_err ARGS; 68 69 #else 70 71 #define D1CMN_ERR(ARGS) 72 #define D2CMN_ERR(ARGS) 73 74 #endif 75 76 77 #ifdef __cplusplus 78 } 79 #endif 80 81 #endif /* _PCF8574_IMPL_H */ 82