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 #include <linux/compiler.h> 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 */ 55 struct i2c_smbus_ioctl_data { 56 __u8 read_write; 57 __u8 command; 58 __u32 size; 59 union i2c_smbus_data __user *data; 60 }; 61 62 /* This is the structure as used in the I2C_RDWR ioctl call */ 63 struct i2c_rdwr_ioctl_data { 64 struct i2c_msg __user *msgs; /* pointers to i2c_msgs */ 65 __u32 nmsgs; /* number of i2c_msgs */ 66 }; 67 68 #define I2C_RDRW_IOCTL_MAX_MSGS 42 69 70 #ifdef __KERNEL__ 71 #define I2C_MAJOR 89 /* Device major number */ 72 #endif 73 74 #endif /* _LINUX_I2C_DEV_H */ 75