1 /* $NetBSD: i2c_io.h,v 1.2 2005/12/11 12:21:22 christos Exp $ */ 2 3 /* 4 * Copyright (c) 2003 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #ifndef _DEV_I2C_I2C_IO_H_ 39 #define _DEV_I2C_I2C_IO_H_ 40 41 #include <sys/ioccom.h> 42 43 /* I2C bus address. */ 44 typedef uint16_t i2c_addr_t; 45 46 /* High-level I2C operations. */ 47 typedef enum { 48 I2C_OP_READ = 0, 49 I2C_OP_READ_WITH_STOP = 1, 50 I2C_OP_WRITE = 2, 51 I2C_OP_WRITE_WITH_STOP = 3, 52 } i2c_op_t; 53 54 #define I2C_OP_READ_P(x) (((int)(x) & 2) == 0) 55 #define I2C_OP_WRITE_P(x) (! I2C_OP_READ_P(x)) 56 #define I2C_OP_STOP_P(x) (((int)(x) & 1) != 0) 57 58 /* 59 * This structure describes a single I2C control script fragment. 60 * 61 * Note that use of this scripted API allows for support of automated 62 * SMBus controllers. The following table maps SMBus operations to 63 * script fragment configuration: 64 * 65 * SMBus "write byte": I2C_OP_WRITE_WITH_STOP 66 * cmdlen = 1 67 * 68 * SMBus "read byte": I2C_OP_READ_WITH_STOP 69 * cmdlen = 1 70 * 71 * SMBus "receive byte": I2C_OP_READ_WITH_STOP 72 * cmdlen = 0 73 * 74 * Note that while each of these 3 SMBus operations implies a STOP 75 * (which an automated controller will likely perform automatically), 76 * non-SMBus clients may continue to function even if they issue 77 * I2C_OP_WRITE and I2C_OP_READ. 78 */ 79 80 /* 81 * I2C_IOCTL_EXEC: 82 * 83 * User ioctl to execute an i2c operation. 84 */ 85 typedef struct i2c_ioctl_exec { 86 i2c_op_t iie_op; /* operation to perform */ 87 i2c_addr_t iie_addr; /* address of device */ 88 const void *iie_cmd; /* pointer to command */ 89 size_t iie_cmdlen; /* length of command */ 90 void *iie_buf; /* pointer to data buffer */ 91 size_t iie_buflen; /* length of data buffer */ 92 } i2c_ioctl_exec_t; 93 #define I2C_EXEC_MAX_CMDLEN 32 94 #define I2C_EXEC_MAX_BUFLEN 32 95 96 #define I2C_IOCTL_EXEC _IOW('I', 0, i2c_ioctl_exec_t) 97 98 #endif /* _DEV_I2C_I2C_IO_H_ */ 99