1738ac067SWolfram Sang /* SPDX-License-Identifier: GPL-2.0+ */ 2738ac067SWolfram Sang /* 3738ac067SWolfram Sang * i2c-algo-bit.h: i2c driver algorithms for bit-shift adapters 4738ac067SWolfram Sang * 5738ac067SWolfram Sang * Copyright (C) 1995-99 Simon G. Vogl 6738ac067SWolfram Sang * With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even 7738ac067SWolfram Sang * Frodo Looijaard <frodol@dds.nl> 8738ac067SWolfram Sang */ 91da177e4SLinus Torvalds 101da177e4SLinus Torvalds #ifndef _LINUX_I2C_ALGO_BIT_H 111da177e4SLinus Torvalds #define _LINUX_I2C_ALGO_BIT_H 121da177e4SLinus Torvalds 132292822eSWolfram Sang #include <linux/i2c.h> 142292822eSWolfram Sang 151da177e4SLinus Torvalds /* --- Defines for bit-adapters --------------------------------------- */ 161da177e4SLinus Torvalds /* 171da177e4SLinus Torvalds * This struct contains the hw-dependent functions of bit-style adapters to 181da177e4SLinus Torvalds * manipulate the line states, and to init any hw-specific features. This is 191da177e4SLinus Torvalds * only used if you have more than one hw-type of adapter running. 201da177e4SLinus Torvalds */ 211da177e4SLinus Torvalds struct i2c_algo_bit_data { 221da177e4SLinus Torvalds void *data; /* private data for lowlevel routines */ 231da177e4SLinus Torvalds void (*setsda) (void *data, int state); 241da177e4SLinus Torvalds void (*setscl) (void *data, int state); 251da177e4SLinus Torvalds int (*getsda) (void *data); 261da177e4SLinus Torvalds int (*getscl) (void *data); 270a9c1475SJean Delvare int (*pre_xfer) (struct i2c_adapter *); 280a9c1475SJean Delvare void (*post_xfer) (struct i2c_adapter *); 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds /* local settings */ 31424ed67cSJean Delvare int udelay; /* half clock cycle time in us, 32424ed67cSJean Delvare minimum 2 us for fast-mode I2C, 33424ed67cSJean Delvare minimum 5 us for standard-mode I2C and SMBus, 34424ed67cSJean Delvare maximum 50 us for SMBus */ 351da177e4SLinus Torvalds int timeout; /* in jiffies */ 368927fbf4SWolfram Sang bool can_do_atomic; /* callbacks don't sleep, we can be atomic */ 371da177e4SLinus Torvalds }; 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds int i2c_bit_add_bus(struct i2c_adapter *); 400f3b4838SJean Delvare int i2c_bit_add_numbered_bus(struct i2c_adapter *); 41b0209b39SDaniel Vetter extern const struct i2c_algorithm i2c_bit_algo; 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds #endif /* _LINUX_I2C_ALGO_BIT_H */ 44