1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2 /*
3 i2c-dev.h - i2c-bus driver, char device interface
4
5 Copyright (C) 1995-97 Simon G. Vogl
6 Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
21 MA 02110-1301 USA.
22 */
23
24 #ifndef _UAPI_LINUX_I2C_DEV_H
25 #define _UAPI_LINUX_I2C_DEV_H
26
27 #include <linux/types.h>
28 #include <linux/compiler.h>
29
30 /* /dev/i2c-X ioctl commands. The ioctl's parameter is always an
31 * unsigned long, except for:
32 * - I2C_FUNCS, takes pointer to an unsigned long
33 * - I2C_RDWR, takes pointer to struct i2c_rdwr_ioctl_data
34 * - I2C_SMBUS, takes pointer to struct i2c_smbus_ioctl_data
35 */
36 #define I2C_RETRIES 0x0701 /* number of times a device address should
37 be polled when not acknowledging */
38 #define I2C_TIMEOUT 0x0702 /* set timeout in units of 10 ms */
39
40 /* NOTE: Slave address is 7 or 10 bits, but 10-bit addresses
41 * are NOT supported! (due to code brokenness)
42 */
43 #define I2C_SLAVE 0x0703 /* Use this slave address */
44 #define I2C_SLAVE_FORCE 0x0706 /* Use this slave address, even if it
45 is already in use by a driver! */
46 #define I2C_TENBIT 0x0704 /* 0 for 7 bit addrs, != 0 for 10 bit */
47
48 #define I2C_FUNCS 0x0705 /* Get the adapter functionality mask */
49
50 #define I2C_RDWR 0x0707 /* Combined R/W transfer (one STOP only) */
51
52 #define I2C_PEC 0x0708 /* != 0 to use PEC with SMBus */
53 #define I2C_SMBUS 0x0720 /* SMBus transfer */
54
55
56 /* This is the structure as used in the I2C_SMBUS ioctl call */
57 struct i2c_smbus_ioctl_data {
58 __u8 read_write;
59 __u8 command;
60 __u32 size;
61 union i2c_smbus_data __user *data;
62 };
63
64 /* This is the structure as used in the I2C_RDWR ioctl call */
65 struct i2c_rdwr_ioctl_data {
66 struct i2c_msg __user *msgs; /* pointers to i2c_msgs */
67 __u32 nmsgs; /* number of i2c_msgs */
68 };
69
70 #define I2C_RDWR_IOCTL_MAX_MSGS 42
71 /* Originally defined with a typo, keep it for compatibility */
72 #define I2C_RDRW_IOCTL_MAX_MSGS I2C_RDWR_IOCTL_MAX_MSGS
73
74
75 #endif /* _UAPI_LINUX_I2C_DEV_H */