/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * * i2c-mux.h - functions for the i2c-bus mux support * * Copyright (c) 2008-2009 Rodolfo Giometti <giometti@linux.it> * Copyright (c) 2008-2009 Eurotech S.p.A. <info@eurotech.it> * Michael Lawnick <michael.lawnick.ext@nsn.com> */ #ifndef _LINUX_I2C_MUX_H #define _LINUX_I2C_MUX_H #ifdef __KERNEL__ #include <linux/bitops.h> struct i2c_mux_core { struct i2c_adapter *parent; struct device *dev; unsigned int mux_locked:1; unsigned int arbitrator:1; unsigned int gate:1; void *priv; int (*select)(struct i2c_mux_core *, u32 chan_id); int (*deselect)(struct i2c_mux_core *, u32 chan_id); int num_adapters; int max_adapters; struct i2c_adapter *adapter[0]; }; struct i2c_mux_core *i2c_mux_alloc(struct i2c_adapter *parent, struct device *dev, int max_adapters, int sizeof_priv, u32 flags, int (*select)(struct i2c_mux_core *, u32), int (*deselect)(struct i2c_mux_core *, u32)); /* flags for i2c_mux_alloc */ #define I2C_MUX_LOCKED BIT(0) #define I2C_MUX_ARBITRATOR BIT(1) #define I2C_MUX_GATE BIT(2) static inline void *i2c_mux_priv(struct i2c_mux_core *muxc) { return muxc->priv; } struct i2c_adapter *i2c_root_adapter(struct device *dev); /* * Called to create an i2c bus on a multiplexed bus segment. * The chan_id parameter is passed to the select and deselect * callback functions to perform hardware-specific mux control. */ int i2c_mux_add_adapter(struct i2c_mux_core *muxc, u32 force_nr, u32 chan_id, unsigned int class); void i2c_mux_del_adapters(struct i2c_mux_core *muxc); #endif /* __KERNEL__ */ #endif /* _LINUX_I2C_MUX_H */