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 }