linux/include/linux/i2c-mux.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *
 * i2c-mux.h - functions for the i2c-bus mux support
 *
 * Copyright (c) 2008-2009 Rodolfo Giometti <[email protected]>
 * Copyright (c) 2008-2009 Eurotech S.p.A. <[email protected]>
 * Michael Lawnick <[email protected]>
 */

#ifndef _LINUX_I2C_MUX_H
#define _LINUX_I2C_MUX_H

#ifdef __KERNEL__

#include <linux/bitops.h>

struct i2c_mux_core { … };

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 …
#define I2C_MUX_ARBITRATOR …
#define I2C_MUX_GATE …

static inline void *i2c_mux_priv(struct i2c_mux_core *muxc)
{ … }

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);

void i2c_mux_del_adapters(struct i2c_mux_core *muxc);

#endif /* __KERNEL__ */

#endif /* _LINUX_I2C_MUX_H */