Annotation of sys/dev/i2c/lm78_i2c.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: lm78_i2c.c,v 1.1 2006/01/28 11:18:41 kettenis 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 <machine/bus.h>
25:
26: #include <dev/i2c/i2cvar.h>
27: #include <dev/ic/lm78var.h>
28:
29: struct lm_i2c_softc {
30: struct lm_softc sc_lmsc;
31: i2c_tag_t sc_tag;
32: i2c_addr_t sc_addr;
33: };
34:
35: int lm_i2c_match(struct device *, void *, void *);
36: void lm_i2c_attach(struct device *, struct device *, void *);
37: int lm_i2c_detach(struct device *, int);
38: u_int8_t lm_i2c_readreg(struct lm_softc *, int);
39: void lm_i2c_writereg(struct lm_softc *, int, int);
40:
41: struct cfattach lm_i2c_ca = {
42: sizeof(struct lm_i2c_softc), lm_i2c_match,
43: lm_i2c_attach, lm_i2c_detach
44: };
45:
46: int
47: lm_i2c_match(struct device *parent, void *match, void *aux)
48: {
49: struct i2c_attach_args *ia = aux;
50:
51: if (strcmp(ia->ia_name, "as99127f") == 0 ||
52: strcmp(ia->ia_name, "w83627hf") == 0 ||
53: strcmp(ia->ia_name, "w83781d") == 0 ||
54: strcmp(ia->ia_name, "w83782d") == 0 ||
55: strcmp(ia->ia_name, "w83783s") == 0 ||
56: strcmp(ia->ia_name, "w83791d") == 0 ||
57: strcmp(ia->ia_name, "w83792d") == 0) {
58: return (1);
59: }
60: /*
61: * XXX This chip doesn't have any real sensors, but we match
62: * it for now, just to knock out its satellites.
63: */
64: if (strcmp(ia->ia_name, "w83791sd") == 0) {
65: return (1);
66: }
67: return (0);
68: }
69:
70: void
71: lm_i2c_attach(struct device *parent, struct device *self, void *aux)
72: {
73: struct lm_i2c_softc *sc = (struct lm_i2c_softc *)self;
74: struct i2c_attach_args *ia = aux;
75: u_int8_t cmd, data;
76:
77: sc->sc_tag = ia->ia_tag;
78: sc->sc_addr = ia->ia_addr;
79:
80: /* Bus-independent attachment. */
81: sc->sc_lmsc.lm_writereg = lm_i2c_writereg;
82: sc->sc_lmsc.lm_readreg = lm_i2c_readreg;
83: lm_attach(&sc->sc_lmsc);
84:
85: /* Remember we attached to iic(4). */
86: sc->sc_lmsc.sbusaddr = ia->ia_addr;
87:
88: iic_acquire_bus(sc->sc_tag, 0);
89:
90: cmd = 0x4a;
91: iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
92: sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);
93:
94: iic_release_bus(sc->sc_tag, 0);
95:
96: /* Make the bus scan ignore the satellites. */
97: iic_ignore_addr(0x48 + (data & 0x7));
98: iic_ignore_addr(0x48 + ((data >> 4) & 0x7));
99: }
100:
101: int
102: lm_i2c_detach(struct device *self, int flags)
103: {
104: struct lm_i2c_softc *sc = (struct lm_i2c_softc *)self;
105:
106: return lm_detach(&sc->sc_lmsc);
107: }
108:
109: u_int8_t
110: lm_i2c_readreg(struct lm_softc *lmsc, int reg)
111: {
112: struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc;
113: u_int8_t cmd, data;
114:
115: iic_acquire_bus(sc->sc_tag, 0);
116:
117: cmd = reg;
118: iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
119: sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);
120:
121: iic_release_bus(sc->sc_tag, 0);
122:
123: return data;
124: }
125:
126: void
127: lm_i2c_writereg(struct lm_softc *lmsc, int reg, int val)
128: {
129: struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc;
130: u_int8_t cmd, data;
131:
132: iic_acquire_bus(sc->sc_tag, 0);
133:
134: cmd = reg;
135: data = val;
136: iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
137: sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);
138:
139: iic_release_bus(sc->sc_tag, 0);
140: }
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