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Diffstat (limited to 'include/linux/i2c-algo-bit.h')
| -rw-r--r-- | include/linux/i2c-algo-bit.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/include/linux/i2c-algo-bit.h b/include/linux/i2c-algo-bit.h new file mode 100644 index 000000000..7fd5575a3 --- /dev/null +++ b/include/linux/i2c-algo-bit.h @@ -0,0 +1,43 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * i2c-algo-bit.h: i2c driver algorithms for bit-shift adapters + * + * Copyright (C) 1995-99 Simon G. Vogl + * With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even + * Frodo Looijaard <frodol@dds.nl> + */ + +#ifndef _LINUX_I2C_ALGO_BIT_H +#define _LINUX_I2C_ALGO_BIT_H + +#include <linux/i2c.h> + +/* --- Defines for bit-adapters --------------------------------------- */ +/* + * This struct contains the hw-dependent functions of bit-style adapters to + * manipulate the line states, and to init any hw-specific features. This is + * only used if you have more than one hw-type of adapter running. + */ +struct i2c_algo_bit_data { + void *data; /* private data for lowlevel routines */ + void (*setsda) (void *data, int state); + void (*setscl) (void *data, int state); + int (*getsda) (void *data); + int (*getscl) (void *data); + int (*pre_xfer) (struct i2c_adapter *); + void (*post_xfer) (struct i2c_adapter *); + + /* local settings */ + int udelay; /* half clock cycle time in us, + minimum 2 us for fast-mode I2C, + minimum 5 us for standard-mode I2C and SMBus, + maximum 50 us for SMBus */ + int timeout; /* in jiffies */ + bool can_do_atomic; /* callbacks don't sleep, we can be atomic */ +}; + +int i2c_bit_add_bus(struct i2c_adapter *); +int i2c_bit_add_numbered_bus(struct i2c_adapter *); +extern const struct i2c_algorithm i2c_bit_algo; + +#endif /* _LINUX_I2C_ALGO_BIT_H */ |