linux-headers (unknown)
1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2 /*
3 * i2c-dev.h - I2C bus char device interface
4 *
5 * Copyright (C) 1995-97 Simon G. Vogl
6 * Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
7 */
8
9 #ifndef _LINUX_I2C_DEV_H
10 #define _LINUX_I2C_DEV_H
11
12 #include <linux/types.h>
13
14
15 /* /dev/i2c-X ioctl commands. The ioctl's parameter is always an
16 * unsigned long, except for:
17 * - I2C_FUNCS, takes pointer to an unsigned long
18 * - I2C_RDWR, takes pointer to struct i2c_rdwr_ioctl_data
19 * - I2C_SMBUS, takes pointer to struct i2c_smbus_ioctl_data
20 */
21 #define I2C_RETRIES 0x0701 /* number of times a device address should
22 be polled when not acknowledging */
23 #define I2C_TIMEOUT 0x0702 /* set timeout in units of 10 ms */
24
25 /* NOTE: Slave address is 7 or 10 bits, but 10-bit addresses
26 * are NOT supported! (due to code brokenness)
27 */
28 #define I2C_SLAVE 0x0703 /* Use this slave address */
29 #define I2C_SLAVE_FORCE 0x0706 /* Use this slave address, even if it
30 is already in use by a driver! */
31 #define I2C_TENBIT 0x0704 /* 0 for 7 bit addrs, != 0 for 10 bit */
32
33 #define I2C_FUNCS 0x0705 /* Get the adapter functionality mask */
34
35 #define I2C_RDWR 0x0707 /* Combined R/W transfer (one STOP only) */
36
37 #define I2C_PEC 0x0708 /* != 0 to use PEC with SMBus */
38 #define I2C_SMBUS 0x0720 /* SMBus transfer */
39
40
41 /* This is the structure as used in the I2C_SMBUS ioctl call */
42 struct i2c_smbus_ioctl_data {
43 __u8 read_write;
44 __u8 command;
45 __u32 size;
46 union i2c_smbus_data *data;
47 };
48
49 /* This is the structure as used in the I2C_RDWR ioctl call */
50 struct i2c_rdwr_ioctl_data {
51 struct i2c_msg *msgs; /* pointers to i2c_msgs */
52 __u32 nmsgs; /* number of i2c_msgs */
53 };
54
55 #define I2C_RDWR_IOCTL_MAX_MSGS 42
56 /* Originally defined with a typo, keep it for compatibility */
57 #define I2C_RDRW_IOCTL_MAX_MSGS I2C_RDWR_IOCTL_MAX_MSGS
58
59
60 #endif /* _LINUX_I2C_DEV_H */
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