1 /* $OpenBSD: lm78_i2c.c,v 1.5 2022/04/06 18:59:28 naddy Exp $ */
2
3 /*
4 * Copyright (c) 2005 Mark Kettenis
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include <sys/param.h>
20 #include <sys/systm.h>
21 #include <sys/device.h>
22 #include <sys/sensors.h>
23
24 #include <dev/i2c/i2cvar.h>
25 #include <dev/ic/lm78var.h>
26
27 struct lm_i2c_softc {
28 struct lm_softc sc_lmsc;
29 i2c_tag_t sc_tag;
30 i2c_addr_t sc_addr;
31 };
32
33 int lm_i2c_match(struct device *, void *, void *);
34 void lm_i2c_attach(struct device *, struct device *, void *);
35 u_int8_t lm_i2c_readreg(struct lm_softc *, int);
36 void lm_i2c_writereg(struct lm_softc *, int, int);
37
38 const struct cfattach lm_i2c_ca = {
39 sizeof(struct lm_i2c_softc), lm_i2c_match, lm_i2c_attach
40 };
41
42 int
lm_i2c_match(struct device * parent,void * match,void * aux)43 lm_i2c_match(struct device *parent, void *match, void *aux)
44 {
45 struct i2c_attach_args *ia = aux;
46
47 if (strcmp(ia->ia_name, "as99127f") == 0 ||
48 strcmp(ia->ia_name, "w83627dhg") == 0 ||
49 strcmp(ia->ia_name, "w83627hf") == 0 ||
50 strcmp(ia->ia_name, "w83781d") == 0 ||
51 strcmp(ia->ia_name, "w83782d") == 0 ||
52 strcmp(ia->ia_name, "w83783s") == 0 ||
53 strcmp(ia->ia_name, "w83791d") == 0 ||
54 strcmp(ia->ia_name, "w83792d") == 0) {
55 return (1);
56 }
57 /*
58 * XXX This chip doesn't have any real sensors, but we match
59 * it for now, just to knock out its satellites.
60 */
61 if (strcmp(ia->ia_name, "w83791sd") == 0) {
62 return (1);
63 }
64 return (0);
65 }
66
67 void
lm_i2c_attach(struct device * parent,struct device * self,void * aux)68 lm_i2c_attach(struct device *parent, struct device *self, void *aux)
69 {
70 struct lm_i2c_softc *sc = (struct lm_i2c_softc *)self;
71 struct i2c_attach_args *ia = aux;
72 u_int8_t cmd, data;
73
74 sc->sc_tag = ia->ia_tag;
75 sc->sc_addr = ia->ia_addr;
76
77 /* Bus-independent attachment. */
78 sc->sc_lmsc.lm_writereg = lm_i2c_writereg;
79 sc->sc_lmsc.lm_readreg = lm_i2c_readreg;
80 lm_attach(&sc->sc_lmsc);
81
82 /* Remember we attached to iic(4). */
83 sc->sc_lmsc.sbusaddr = ia->ia_addr;
84
85 iic_acquire_bus(sc->sc_tag, 0);
86
87 cmd = 0x4a;
88 iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
89 sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);
90
91 iic_release_bus(sc->sc_tag, 0);
92
93 /* Make the bus scan ignore the satellites. */
94 iic_ignore_addr(0x48 + (data & 0x7));
95 iic_ignore_addr(0x48 + ((data >> 4) & 0x7));
96 }
97
98 u_int8_t
lm_i2c_readreg(struct lm_softc * lmsc,int reg)99 lm_i2c_readreg(struct lm_softc *lmsc, int reg)
100 {
101 struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc;
102 u_int8_t cmd, data;
103
104 iic_acquire_bus(sc->sc_tag, 0);
105
106 cmd = reg;
107 iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
108 sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);
109
110 iic_release_bus(sc->sc_tag, 0);
111
112 return data;
113 }
114
115 void
lm_i2c_writereg(struct lm_softc * lmsc,int reg,int val)116 lm_i2c_writereg(struct lm_softc *lmsc, int reg, int val)
117 {
118 struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc;
119 u_int8_t cmd, data;
120
121 iic_acquire_bus(sc->sc_tag, 0);
122
123 cmd = reg;
124 data = val;
125 iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
126 sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);
127
128 iic_release_bus(sc->sc_tag, 0);
129 }
130