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., 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 */ 56 struct 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 */ 64 struct 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 */ 76