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e2be04c7 | 1 | /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ |
607ca46e | 2 | /* |
1713d66c WS |
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 | */ | |
607ca46e DH |
8 | |
9 | #ifndef _UAPI_LINUX_I2C_DEV_H | |
10 | #define _UAPI_LINUX_I2C_DEV_H | |
11 | ||
12 | #include <linux/types.h> | |
13 | #include <linux/compiler.h> | |
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 __user *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 __user *msgs; /* pointers to i2c_msgs */ | |
52 | __u32 nmsgs; /* number of i2c_msgs */ | |
53 | }; | |
54 | ||
c57d3e7a JD |
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 | |
607ca46e DH |
58 | |
59 | ||
60 | #endif /* _UAPI_LINUX_I2C_DEV_H */ |