include/linux/i2c-algo-bit.h

0001 /* SPDX-License-Identifier: GPL-2.0+ */
0002 /*
0003  * i2c-algo-bit.h: i2c driver algorithms for bit-shift adapters
0004  *
0005  *   Copyright (C) 1995-99 Simon G. Vogl
0006  * With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even
0007  * Frodo Looijaard <frodol@dds.nl>
0008  */
0009
0010 #ifndef _LINUX_I2C_ALGO_BIT_H
0011 #define _LINUX_I2C_ALGO_BIT_H
0012
0013 #include <linux/i2c.h>
0014
0015 /* --- Defines for bit-adapters --------------------------------------- */
0016 /*
0017  * This struct contains the hw-dependent functions of bit-style adapters to
0018  * manipulate the line states, and to init any hw-specific features. This is
0019  * only used if you have more than one hw-type of adapter running.
0020  */
0021 struct i2c_algo_bit_data {
0022     void *data;     /* private data for lowlevel routines */
0023     void (*setsda) (void *data, int state);
0024     void (*setscl) (void *data, int state);
0025     int  (*getsda) (void *data);
0026     int  (*getscl) (void *data);
0027     int  (*pre_xfer)  (struct i2c_adapter *);
0028     void (*post_xfer) (struct i2c_adapter *);
0029
0030     /* local settings */
0031     int udelay;     /* half clock cycle time in us,
0032                    minimum 2 us for fast-mode I2C,
0033                    minimum 5 us for standard-mode I2C and SMBus,
0034                    maximum 50 us for SMBus */
0035     int timeout;        /* in jiffies */
0036     bool can_do_atomic; /* callbacks don't sleep, we can be atomic */
0037 };
0038
0039 int i2c_bit_add_bus(struct i2c_adapter *);
0040 int i2c_bit_add_numbered_bus(struct i2c_adapter *);
0041 extern const struct i2c_algorithm i2c_bit_algo;
0042
0043 #endif /* _LINUX_I2C_ALGO_BIT_H */