1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * i2c-algo-bit.h: i2c driver algorithms for bit-shift adapters 4 * 5 * Copyright (C) 1995-99 Simon G. Vogl 6 * With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even 7 * Frodo Looijaard <frodol@dds.nl> 8 */ 9 10 #ifndef _LINUX_I2C_ALGO_BIT_H 11 #define _LINUX_I2C_ALGO_BIT_H 12 13 #include <linux/i2c.h> 14 15 /* --- Defines for bit-adapters --------------------------------------- */ 16 /* 17 * This struct contains the hw-dependent functions of bit-style adapters to 18 * manipulate the line states, and to init any hw-specific features. This is 19 * only used if you have more than one hw-type of adapter running. 20 */ 21 struct i2c_algo_bit_data { 22 void *data; /* private data for lowlevel routines */ 23 void (*setsda) (void *data, int state); 24 void (*setscl) (void *data, int state); 25 int (*getsda) (void *data); 26 int (*getscl) (void *data); 27 int (*pre_xfer) (struct i2c_adapter *); 28 void (*post_xfer) (struct i2c_adapter *); 29 30 /* local settings */ 31 int udelay; /* half clock cycle time in us, 32 minimum 2 us for fast-mode I2C, 33 minimum 5 us for standard-mode I2C and SMBus, 34 maximum 50 us for SMBus */ 35 int timeout; /* in jiffies */ 36 bool can_do_atomic; /* callbacks don't sleep, we can be atomic */ 37 }; 38 39 int i2c_bit_add_bus(struct i2c_adapter *); 40 int i2c_bit_add_numbered_bus(struct i2c_adapter *); 41 extern const struct i2c_algorithm i2c_bit_algo; 42 43 #endif /* _LINUX_I2C_ALGO_BIT_H */ 44