Home | History | Annotate | Line # | Download | only in i2c
i2c.c revision 1.6 
      1 /*	$NetBSD: i2c.c,v 1.6 2006/03/27 23:59:38 jmcneill Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2003 Wasabi Systems, Inc.
      5  * All rights reserved.
      6  *
      7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *      This product includes software developed for the NetBSD Project by
     20  *      Wasabi Systems, Inc.
     21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     22  *    or promote products derived from this software without specific prior
     23  *    written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     35  * POSSIBILITY OF SUCH DAMAGE.
     36  */
     37 
     38 #include <sys/param.h>
     39 #include <sys/systm.h>
     40 #include <sys/device.h>
     41 #include <sys/event.h>
     42 #include <sys/conf.h>
     43 
     44 #include <dev/i2c/i2cvar.h>
     45 
     46 #include "locators.h"
     47 
     48 struct iic_softc {
     49 	struct device sc_dev;
     50 	i2c_tag_t sc_tag;
     51 	int sc_type;
     52 };
     53 
     54 int
     55 iicbus_print(void *aux, const char *pnp)
     56 {
     57 	struct i2cbus_attach_args *iba = aux;
     58 
     59 	if (pnp != NULL)
     60 		aprint_normal("%s at %s", iba->iba_name, pnp);
     61 
     62 	return (UNCONF);
     63 }
     64 
     65 static int
     66 iic_print(void *aux, const char *pnp)
     67 {
     68 	struct i2c_attach_args *ia = aux;
     69 
     70 	if (ia->ia_addr != (i2c_addr_t)-1)
     71 		aprint_normal(" addr 0x%x", ia->ia_addr);
     72 
     73 	return (UNCONF);
     74 }
     75 
     76 static int
     77 iic_search(struct device *parent, struct cfdata *cf,
     78 	   const int *ldesc, void *aux)
     79 {
     80 	struct iic_softc *sc = (void *) parent;
     81 	struct i2c_attach_args ia;
     82 
     83 	ia.ia_tag = sc->sc_tag;
     84 	ia.ia_addr = cf->cf_loc[IICCF_ADDR];
     85 	ia.ia_size = cf->cf_loc[IICCF_SIZE];
     86 	ia.ia_type = sc->sc_type;
     87 
     88 	if (config_match(parent, cf, &ia) > 0)
     89 		config_attach(parent, cf, &ia, iic_print);
     90 
     91 	return (0);
     92 }
     93 
     94 static int
     95 iic_match(struct device *parent, struct cfdata *cf, void *aux)
     96 {
     97 	struct i2cbus_attach_args *iba = aux;
     98 
     99 	/* Just make sure we're looking for i2c. */
    100 	return (strcmp(iba->iba_name, cf->cf_name) == 0);
    101 }
    102 
    103 static void
    104 iic_attach(struct device *parent, struct device *self, void *aux)
    105 {
    106 	struct iic_softc *sc = (void *) self;
    107 	struct i2cbus_attach_args *iba = aux;
    108 
    109 	aprint_naive(": I2C bus\n");
    110 	aprint_normal(": I2C bus\n");
    111 
    112 	sc->sc_tag = iba->iba_tag;
    113 	sc->sc_type = iba->iba_type;
    114 
    115 	/*
    116 	 * Attach all i2c devices described in the kernel
    117 	 * configuration file.
    118 	 */
    119 	config_search_ia(iic_search, self, "iic", NULL);
    120 }
    121 
    122 CFATTACH_DECL(iic, sizeof(struct iic_softc),
    123     iic_match, iic_attach, NULL, NULL);
    124