Line data Source code
1 : /* $OpenBSD: spdmem_i2c.c,v 1.1 2010/03/22 21:20:58 miod Exp $ */
2 : /* $NetBSD: spdmem.c,v 1.3 2007/09/20 23:09:59 xtraeme Exp $ */
3 :
4 : /*
5 : * Copyright (c) 2007 Jonathan Gray <jsg@openbsd.org>
6 : *
7 : * Permission to use, copy, modify, and distribute this software for any
8 : * purpose with or without fee is hereby granted, provided that the above
9 : * copyright notice and this permission notice appear in all copies.
10 : *
11 : * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 : * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 : * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 : * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 : * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 : * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 : * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 : */
19 :
20 : /*
21 : * Copyright (c) 2007 Nicolas Joly
22 : * Copyright (c) 2007 Paul Goyette
23 : * Copyright (c) 2007 Tobias Nygren
24 : * All rights reserved.
25 : *
26 : * Redistribution and use in source and binary forms, with or without
27 : * modification, are permitted provided that the following conditions
28 : * are met:
29 : * 1. Redistributions of source code must retain the above copyright
30 : * notice, this list of conditions and the following disclaimer.
31 : * 2. Redistributions in binary form must reproduce the above copyright
32 : * notice, this list of conditions and the following disclaimer in the
33 : * documentation and/or other materials provided with the distribution.
34 : * 3. The name of the author may not be used to endorse or promote products
35 : * derived from this software without specific prior written permission.
36 : *
37 : * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS
38 : * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
39 : * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
40 : * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
41 : * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
42 : * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
43 : * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
44 : * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
45 : * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46 : * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
47 : * POSSIBILITY OF SUCH DAMAGE.
48 : */
49 :
50 : /*
51 : * Serial Presence Detect (SPD) memory identification
52 : */
53 :
54 : #include <sys/param.h>
55 : #include <sys/systm.h>
56 : #include <sys/device.h>
57 :
58 : #include <dev/spdmemvar.h>
59 : #include <dev/i2c/i2cvar.h>
60 :
61 : struct spdmem_iic_softc {
62 : struct spdmem_softc sc_base;
63 : i2c_tag_t sc_tag;
64 : i2c_addr_t sc_addr;
65 : };
66 :
67 : int spdmem_iic_match(struct device *, void *, void *);
68 : void spdmem_iic_attach(struct device *, struct device *, void *);
69 : uint8_t spdmem_iic_read(struct spdmem_softc *, uint8_t);
70 :
71 : struct cfattach spdmem_iic_ca = {
72 : sizeof(struct spdmem_iic_softc), spdmem_iic_match, spdmem_iic_attach
73 : };
74 :
75 : int
76 0 : spdmem_iic_match(struct device *parent, void *match, void *aux)
77 : {
78 0 : struct i2c_attach_args *ia = aux;
79 0 : struct spdmem_iic_softc sc;
80 :
81 : /* clever attachments like openfirmware informed macppc */
82 0 : if (strcmp(ia->ia_name, "spd") == 0)
83 0 : return (1);
84 :
85 : /* dumb, need sanity checks */
86 0 : if (strcmp(ia->ia_name, "eeprom") != 0)
87 0 : return (0);
88 :
89 0 : sc.sc_tag = ia->ia_tag;
90 0 : sc.sc_addr = ia->ia_addr;
91 0 : sc.sc_base.sc_read = spdmem_iic_read;
92 :
93 0 : return spdmem_probe(&sc.sc_base);
94 0 : }
95 :
96 : void
97 0 : spdmem_iic_attach(struct device *parent, struct device *self, void *aux)
98 : {
99 0 : struct spdmem_iic_softc *sc = (struct spdmem_iic_softc *)self;
100 0 : struct i2c_attach_args *ia = aux;
101 :
102 0 : sc->sc_tag = ia->ia_tag;
103 0 : sc->sc_addr = ia->ia_addr;
104 0 : sc->sc_base.sc_read = spdmem_iic_read;
105 :
106 0 : printf(":");
107 :
108 0 : spdmem_attach_common(&sc->sc_base);
109 0 : }
110 :
111 : uint8_t
112 0 : spdmem_iic_read(struct spdmem_softc *v, uint8_t reg)
113 : {
114 0 : struct spdmem_iic_softc *sc = (struct spdmem_iic_softc *)v;
115 0 : uint8_t val = 0xff;
116 :
117 0 : iic_acquire_bus(sc->sc_tag,0);
118 0 : iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
119 : ®, sizeof reg, &val, sizeof val, 0);
120 0 : iic_release_bus(sc->sc_tag, 0);
121 :
122 0 : return val;
123 0 : }
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