1 /* $NetBSD: i2c_io.h,v 1.3 2012/04/22 14:10:36 pgoyette 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 #define I2C_OPMASK_STOP 1 48 #define I2C_OPMASK_WRITE 2 49 #define I2C_OPMASK_BLKMODE 4 50 51 #define I2C_OP_STOP_P(x) (((int)(x) & I2C_OPMASK_STOP) != 0) 52 #define I2C_OP_WRITE_P(x) (((int)(x) & I2C_OPMASK_WRITE) != 0) 53 #define I2C_OP_READ_P(x) (!I2C_OP_WRITE_P(x)) 54 #define I2C_OP_BLKMODE_P(x) (((int)(x) & I2C_OPMASK_BLKMODE) != 0) 55 56 typedef enum { 57 I2C_OP_READ = 0, 58 I2C_OP_READ_WITH_STOP = I2C_OPMASK_STOP, 59 I2C_OP_WRITE = I2C_OPMASK_WRITE, 60 I2C_OP_WRITE_WITH_STOP = I2C_OPMASK_WRITE | I2C_OPMASK_STOP, 61 I2C_OP_READ_BLOCK = I2C_OPMASK_BLKMODE | I2C_OPMASK_STOP, 62 I2C_OP_WRITE_BLOCK = I2C_OPMASK_BLKMODE | I2C_OPMASK_WRITE | 63 I2C_OPMASK_STOP, 64 } i2c_op_t; 65 66 /* 67 * This structure describes a single I2C control script fragment. 68 * 69 * Note that use of this scripted API allows for support of automated 70 * SMBus controllers. The following table maps SMBus operations to 71 * script fragment configuration: 72 * 73 * SMBus "write byte": I2C_OP_WRITE_WITH_STOP 74 * cmdlen = 1 75 * 76 * SMBus "read byte": I2C_OP_READ_WITH_STOP 77 * cmdlen = 1 78 * 79 * SMBus "receive byte": I2C_OP_READ_WITH_STOP 80 * cmdlen = 0 81 * 82 * Note that while each of these 3 SMBus operations implies a STOP 83 * (which an automated controller will likely perform automatically), 84 * non-SMBus clients may continue to function even if they issue 85 * I2C_OP_WRITE and I2C_OP_READ. 86 */ 87 88 /* 89 * I2C_IOCTL_EXEC: 90 * 91 * User ioctl to execute an i2c operation. 92 */ 93 typedef struct i2c_ioctl_exec { 94 i2c_op_t iie_op; /* operation to perform */ 95 i2c_addr_t iie_addr; /* address of device */ 96 const void *iie_cmd; /* pointer to command */ 97 size_t iie_cmdlen; /* length of command */ 98 void *iie_buf; /* pointer to data buffer */ 99 size_t iie_buflen; /* length of data buffer */ 100 } i2c_ioctl_exec_t; 101 #define I2C_EXEC_MAX_CMDLEN 32 102 #define I2C_EXEC_MAX_BUFLEN 32 103 104 #define I2C_IOCTL_EXEC _IOW('I', 0, i2c_ioctl_exec_t) 105 106 #endif /* _DEV_I2C_I2C_IO_H_ */ 107