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Annotation of sys/dev/i2c/i2c.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: i2c.c,v 1.14 2006/02/26 20:24:46 deraadt Exp $        */
                      2: /*     $NetBSD: i2c.c,v 1.1 2003/09/30 00:35:31 thorpej Exp $  */
                      3:
                      4: /*
                      5:  * Copyright (c) 2003 Wasabi Systems, Inc.
                      6:  * All rights reserved.
                      7:  *
                      8:  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
                      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:  * 3. All advertising materials mentioning features or use of this software
                     19:  *    must display the following acknowledgement:
                     20:  *      This product includes software developed for the NetBSD Project by
                     21:  *      Wasabi Systems, Inc.
                     22:  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
                     23:  *    or promote products derived from this software without specific prior
                     24:  *    written permission.
                     25:  *
                     26:  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
                     27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     28:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     29:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
                     30:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     31:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     32:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     33:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     34:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     35:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     36:  * POSSIBILITY OF SUCH DAMAGE.
                     37:  */
                     38:
                     39: #include <sys/param.h>
                     40: #include <sys/systm.h>
                     41: #include <sys/device.h>
                     42: #include <sys/event.h>
                     43: #include <sys/conf.h>
                     44:
                     45: #define _I2C_PRIVATE
                     46: #include <dev/i2c/i2cvar.h>
                     47:
                     48: #define IICCF_ADDR     0
                     49: #define IICCF_SIZE     1
                     50:
                     51: #include "ipmi.h"
                     52:
                     53: struct iic_softc {
                     54:        struct device sc_dev;
                     55:        i2c_tag_t sc_tag;
                     56: };
                     57:
                     58: int    iic_match(struct device *, void *, void *);
                     59: void   iic_attach(struct device *, struct device *, void *);
                     60: int    iic_search(struct device *, void *, void *);
                     61:
                     62: struct cfattach iic_ca = {
                     63:        sizeof (struct iic_softc),
                     64:        iic_match,
                     65:        iic_attach
                     66: };
                     67:
                     68: struct cfdriver iic_cd = {
                     69:        NULL, "iic", DV_DULL
                     70: };
                     71:
                     72: int
                     73: iicbus_print(void *aux, const char *pnp)
                     74: {
                     75:        struct i2cbus_attach_args *iba = aux;
                     76:
                     77:        if (pnp != NULL)
                     78:                printf("%s at %s", iba->iba_name, pnp);
                     79:
                     80:        return (UNCONF);
                     81: }
                     82:
                     83: int
                     84: iic_print(void *aux, const char *pnp)
                     85: {
                     86:        struct i2c_attach_args *ia = aux;
                     87:
                     88:        if (pnp != NULL)
                     89:                printf("\"%s\" at %s", ia->ia_name, pnp);
                     90:        printf(" addr 0x%x", ia->ia_addr);
                     91:
                     92:        return (UNCONF);
                     93: }
                     94:
                     95: int
                     96: iic_search(struct device *parent, void *arg, void *aux)
                     97: {
                     98:        struct iic_softc *sc = (void *) parent;
                     99:        struct cfdata *cf = arg;
                    100:        struct i2c_attach_args ia;
                    101:
                    102:        if (cf->cf_loc[IICCF_ADDR] != -1) {
                    103:                memset(&ia, 0, sizeof(ia));
                    104:                ia.ia_tag = sc->sc_tag;
                    105:                ia.ia_addr = cf->cf_loc[IICCF_ADDR];
                    106:                ia.ia_size = cf->cf_loc[IICCF_SIZE];
                    107:                ia.ia_name = "unknown";
                    108:
                    109:                if (cf->cf_attach->ca_match(parent, cf, &ia) > 0)
                    110:                        config_attach(parent, cf, &ia, iic_print);
                    111:        }
                    112:        return (0);
                    113: }
                    114:
                    115: int
                    116: iic_match(struct device *parent, void *arg, void *aux)
                    117: {
                    118:        struct cfdata *cf = arg;
                    119:        struct i2cbus_attach_args *iba = aux;
                    120:
                    121:        /* Just make sure we're looking for i2c. */
                    122:        return (strcmp(iba->iba_name, cf->cf_driver->cd_name) == 0);
                    123: }
                    124:
                    125: void
                    126: iic_attach(struct device *parent, struct device *self, void *aux)
                    127: {
                    128:        struct iic_softc *sc = (void *) self;
                    129:        struct i2cbus_attach_args *iba = aux;
                    130:
                    131:        sc->sc_tag = iba->iba_tag;
                    132:
                    133: #if NIPMI > 0
                    134:        extern int ipmi_enabled;
                    135:
                    136:        if (ipmi_enabled) {
                    137:                printf(": disabled to avoid ipmi0 interactions\n");
                    138:                return;
                    139:        }
                    140: #endif
                    141:
                    142:        printf("\n");
                    143:
                    144:        /*
                    145:         * Attach all i2c devices described in the kernel
                    146:         * configuration file.
                    147:         */
                    148:        config_search(iic_search, self, NULL);
                    149:
                    150:        /*
                    151:         * Scan for known device signatures.
                    152:         */
                    153:        if (iba->iba_bus_scan)
                    154:                (iba->iba_bus_scan)(self, aux, iba->iba_bus_scan_arg);
                    155:        else
                    156:                iic_scan(self, aux);
                    157: }