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Linux/include/linux/i2c-algo-bit.h

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  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 

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