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

   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 */
  21struct 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
  39int i2c_bit_add_bus(struct i2c_adapter *);
  40int i2c_bit_add_numbered_bus(struct i2c_adapter *);
  41extern const struct i2c_algorithm i2c_bit_algo;
  42
  43#endif /* _LINUX_I2C_ALGO_BIT_H */
  44