projects/linux·blob da89fb16 · refs

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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 <[email protected]>
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., 51 Franklin Street, Fifth Floor, Boston,
20 MA 02110-1301 USA.
21*/
22
23#ifndef _LINUX_I2C_DEV_H
24#define _LINUX_I2C_DEV_H
25
26#include <linux/types.h>
27#include <linux/compiler.h>
28
29/* /dev/i2c-X ioctl commands. The ioctl's parameter is always an
30 * unsigned long, except for:
31 * - I2C_FUNCS, takes pointer to an unsigned long
32 * - I2C_RDWR, takes pointer to struct i2c_rdwr_ioctl_data
33 * - I2C_SMBUS, takes pointer to struct i2c_smbus_ioctl_data
34 */
35#define I2C_RETRIES 0x0701 /* number of times a device address should
36 be polled when not acknowledging */
37#define I2C_TIMEOUT 0x0702 /* set timeout in units of 10 ms */
38
39/* NOTE: Slave address is 7 or 10 bits, but 10-bit addresses
40 * are NOT supported! (due to code brokenness)
41 */
42#define I2C_SLAVE 0x0703 /* Use this slave address */
43#define I2C_SLAVE_FORCE 0x0706 /* Use this slave address, even if it
44 is already in use by a driver! */
45#define I2C_TENBIT 0x0704 /* 0 for 7 bit addrs, != 0 for 10 bit */
46
47#define I2C_FUNCS 0x0705 /* Get the adapter functionality mask */
48
49#define I2C_RDWR 0x0707 /* Combined R/W transfer (one STOP only) */
50
51#define I2C_PEC 0x0708 /* != 0 to use PEC with SMBus */
52#define I2C_SMBUS 0x0720 /* SMBus transfer */
53
54
55/* This is the structure as used in the I2C_SMBUS ioctl call */
56struct i2c_smbus_ioctl_data {
57 __u8 read_write;
58 __u8 command;
59 __u32 size;
60 union i2c_smbus_data __user *data;
61};
62
63/* This is the structure as used in the I2C_RDWR ioctl call */
64struct i2c_rdwr_ioctl_data {
65 struct i2c_msg __user *msgs; /* pointers to i2c_msgs */
66 __u32 nmsgs; /* number of i2c_msgs */
67};
68
69#define I2C_RDRW_IOCTL_MAX_MSGS 42
70
71#ifdef __KERNEL__
72#define I2C_MAJOR 89 /* Device major number */
73#endif
74
75#endif /* _LINUX_I2C_DEV_H */