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i2c_enum.h revision 1.1.2.1 
      1 /*	$NetBSD: i2c_enum.h,v 1.1.2.1 2021/09/13 14:47:28 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2021 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_I2C_ENUM_H_
     33 #define	_DEV_I2C_I2C_ENUM_H_
     34 
     35 #include <dev/i2c/i2cvar.h>
     36 
     37 /*
     38  * Helpers for enumerating known i2c devices, that can be used from
     39  * the i2c-enumerate-devices device call.
     40  */
     41 struct i2c_deventry {
     42 	const char *name;
     43 	const char *compat;
     44 	i2c_addr_t addr;
     45 };
     46 
     47 static inline int __unused
     48 i2c_enumerate_deventries(device_t dev, devhandle_t call_handle,
     49     struct i2c_enumerate_devices_args *args,
     50     const struct i2c_deventry *entries, unsigned int nentries)
     51 {
     52 	unsigned int i;
     53 	bool cbrv;
     54 
     55 	for (i = 0; i < nentries; i++) {
     56 		args->ia->ia_addr = entries[i].addr;
     57 		args->ia->ia_name = entries[i].name;
     58 		args->ia->ia_clist = entries[i].compat;
     59 		args->ia->ia_clist_size =
     60 		    entries[i].compat != NULL ? strlen(entries[i].compat) + 1
     61 					      : 0;
     62 
     63 		/* no devhandle for child devices. */
     64 		devhandle_invalidate(&args->ia->ia_devhandle);
     65 
     66 		cbrv = args->callback(dev, args);
     67 
     68 		if (!cbrv) {
     69 			break;
     70 		}
     71 	}
     72 
     73 	return 0;
     74 }
     75 
     76 #endif /* _DEV_I2C_I2C_ENUM_H_ */
     77