1/*
2    i2c-dev.h - i2c-bus driver, char device interface
3
4    Copyright (C) 1995-97 Simon G. Vogl
5    Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
6
7    This program is free software; you can redistribute it and/or modify
8    it under the terms of the GNU General Public License as published by
9    the Free Software Foundation; either version 2 of the License, or
10    (at your option) any later version.
11
12    This program is distributed in the hope that it will be useful,
13    but WITHOUT ANY WARRANTY; without even the implied warranty of
14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15    GNU General Public License for more details.
16
17    You should have received a copy of the GNU General Public License
18    along with this program; if not, write to the Free Software
19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20*/
21
22#ifndef _LINUX_I2C_DEV_H
23#define _LINUX_I2C_DEV_H
24
25#include <linux/types.h>
26
27
28/* /dev/i2c-X ioctl commands.  The ioctl's parameter is always an
29 * unsigned long, except for:
30 *	- I2C_FUNCS, takes pointer to an unsigned long
31 *	- I2C_RDWR, takes pointer to struct i2c_rdwr_ioctl_data
32 *	- I2C_SMBUS, takes pointer to struct i2c_smbus_ioctl_data
33 */
34#define I2C_RETRIES	0x0701	/* number of times a device address should
35				   be polled when not acknowledging */
36#define I2C_TIMEOUT	0x0702	/* set timeout in units of 10 ms */
37
38/* NOTE: Slave address is 7 or 10 bits, but 10-bit addresses
39 * are NOT supported! (due to code brokenness)
40 */
41#define I2C_SLAVE	0x0703	/* Use this slave address */
42#define I2C_SLAVE_FORCE	0x0706	/* Use this slave address, even if it
43				   is already in use by a driver! */
44#define I2C_TENBIT	0x0704	/* 0 for 7 bit addrs, != 0 for 10 bit */
45
46#define I2C_FUNCS	0x0705	/* Get the adapter functionality mask */
47
48#define I2C_RDWR	0x0707	/* Combined R/W transfer (one STOP only) */
49
50#define I2C_PEC		0x0708	/* != 0 to use PEC with SMBus */
51#define I2C_SMBUS	0x0720	/* SMBus transfer */
52
53
54/* This is the structure as used in the I2C_SMBUS ioctl call */
55struct i2c_smbus_ioctl_data {
56	__u8 read_write;
57	__u8 command;
58	__u32 size;
59	union i2c_smbus_data *data;
60};
61
62/* This is the structure as used in the I2C_RDWR ioctl call */
63struct i2c_rdwr_ioctl_data {
64	struct i2c_msg *msgs;	/* pointers to i2c_msgs */
65	__u32 nmsgs;			/* number of i2c_msgs */
66};
67
68#define  I2C_RDRW_IOCTL_MAX_MSGS	42
69
70
71#endif /* _LINUX_I2C_DEV_H */
72