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cd97f39b7c
The unit in which user-space can set the bus timeout value is jiffies for historical reasons (back when HZ was always 100.) This is however not good because user-space doesn't know how long a jiffy lasts. The timeout value should instead be set in a fixed time unit. Given the original value of HZ, this unit should be 10 ms, for compatibility. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Wolfram Sang <w.sang@pengutronix.de>
75 lines
2.5 KiB
C
75 lines
2.5 KiB
C
/*
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i2c-dev.h - i2c-bus driver, char device interface
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Copyright (C) 1995-97 Simon G. Vogl
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Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _LINUX_I2C_DEV_H
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#define _LINUX_I2C_DEV_H
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#include <linux/types.h>
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#include <linux/compiler.h>
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/* /dev/i2c-X ioctl commands. The ioctl's parameter is always an
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* unsigned long, except for:
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* - I2C_FUNCS, takes pointer to an unsigned long
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* - I2C_RDWR, takes pointer to struct i2c_rdwr_ioctl_data
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* - I2C_SMBUS, takes pointer to struct i2c_smbus_ioctl_data
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*/
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#define I2C_RETRIES 0x0701 /* number of times a device address should
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be polled when not acknowledging */
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#define I2C_TIMEOUT 0x0702 /* set timeout in units of 10 ms */
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/* NOTE: Slave address is 7 or 10 bits, but 10-bit addresses
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* are NOT supported! (due to code brokenness)
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*/
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#define I2C_SLAVE 0x0703 /* Use this slave address */
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#define I2C_SLAVE_FORCE 0x0706 /* Use this slave address, even if it
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is already in use by a driver! */
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#define I2C_TENBIT 0x0704 /* 0 for 7 bit addrs, != 0 for 10 bit */
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#define I2C_FUNCS 0x0705 /* Get the adapter functionality mask */
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#define I2C_RDWR 0x0707 /* Combined R/W transfer (one STOP only) */
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#define I2C_PEC 0x0708 /* != 0 to use PEC with SMBus */
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#define I2C_SMBUS 0x0720 /* SMBus transfer */
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/* This is the structure as used in the I2C_SMBUS ioctl call */
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struct i2c_smbus_ioctl_data {
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__u8 read_write;
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__u8 command;
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__u32 size;
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union i2c_smbus_data __user *data;
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};
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/* This is the structure as used in the I2C_RDWR ioctl call */
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struct i2c_rdwr_ioctl_data {
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struct i2c_msg __user *msgs; /* pointers to i2c_msgs */
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__u32 nmsgs; /* number of i2c_msgs */
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};
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#define I2C_RDRW_IOCTL_MAX_MSGS 42
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#ifdef __KERNEL__
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#define I2C_MAJOR 89 /* Device major number */
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#endif
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#endif /* _LINUX_I2C_DEV_H */
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