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i2cmuxvar.h revision 1.3.4.2 
      1 /*	$NetBSD: i2cmuxvar.h,v 1.3.4.2 2021/05/08 15:10:44 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2020 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _DEV_I2C_I2CMUXVAR_H_
     33 #define	_DEV_I2C_I2CMUXVAR_H_
     34 
     35 #include <dev/i2c/i2cvar.h>
     36 
     37 /* XXX This is not ideal, but... XXX */
     38 
     39 #if defined(__arm__) || defined(__aarch64__)
     40 
     41 #ifdef _KERNEL_OPT
     42 #include "opt_fdt.h"
     43 
     44 #if defined(FDT)
     45 #define	I2CMUX_USE_FDT
     46 #endif
     47 
     48 #else /* _KERNEL_OPT */
     49 
     50 #define	I2CMUX_USE_FDT
     51 
     52 #endif /* _KERNEL_OPT */
     53 
     54 #endif /* __arm__ || __aarch64__ */
     55 
     56 /* XXX ^^^ XXX */
     57 
     58 #if defined(I2CMUX_USE_FDT)
     59 #include <dev/fdt/fdtvar.h>
     60 #endif
     61 
     62 struct iicmux_softc;
     63 struct iicmux_bus;
     64 
     65 struct iicmux_config {
     66 	const char *desc;
     67 	void *	(*get_mux_info)(struct iicmux_softc *);
     68 	void *	(*get_bus_info)(struct iicmux_bus *);
     69 	int	(*acquire_bus)(struct iicmux_bus *, int);
     70 	void	(*release_bus)(struct iicmux_bus *, int);
     71 };
     72 
     73 struct iicmux_bus {
     74 	struct i2c_controller controller;
     75 	struct iicmux_softc *mux;
     76 	devhandle_t devhandle;
     77 	int busidx;
     78 	void *bus_data;
     79 };
     80 
     81 struct iicmux_softc {
     82 	device_t			sc_dev;
     83 	const struct iicmux_config *	sc_config;
     84 	i2c_tag_t			sc_i2c_parent;
     85 	struct iicmux_bus *		sc_busses;
     86 	int				sc_nbusses;
     87 	void *				sc_mux_data;
     88 };
     89 
     90 void	iicmux_attach(struct iicmux_softc *);
     91 
     92 #endif /* _DEV_I2C_I2CMUXVAR_H_ */
     93