1/*	$NetBSD: lm_i2c.c,v 1.7 2021/06/13 09:48:44 mlelstv Exp $	*/
2
3/*-
4 * Copyright (c) 2000 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Bill Squier.
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 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__KERNEL_RCSID(0, "$NetBSD: lm_i2c.c,v 1.7 2021/06/13 09:48:44 mlelstv Exp $");
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/kernel.h>
38#include <sys/device.h>
39#include <sys/conf.h>
40#include <sys/kmem.h>
41
42#include <dev/i2c/i2cvar.h>
43
44#include <dev/sysmon/sysmonvar.h>
45
46#include <dev/ic/nslm7xvar.h>
47
48int 	lm_i2c_match(device_t, cfdata_t, void *);
49void 	lm_i2c_attach(device_t, device_t, void *);
50int 	lm_i2c_detach(device_t, int);
51
52uint8_t lm_i2c_readreg(struct lm_softc *, int);
53void 	lm_i2c_writereg(struct lm_softc *, int, uint8_t);
54
55struct lm_i2c_softc {
56	struct lm_softc sc_lmsc;
57	i2c_tag_t sc_tag;
58	i2c_addr_t sc_addr;
59};
60
61CFATTACH_DECL_NEW(lm_iic, sizeof(struct lm_i2c_softc),
62    lm_i2c_match, lm_i2c_attach, lm_i2c_detach, NULL);
63
64int
65lm_i2c_match(device_t parent, cfdata_t match, void *aux)
66{
67	struct i2c_attach_args *ia = aux;
68	int rv = 0;
69	struct lm_i2c_softc *sc;
70
71	/* Must supply an address */
72	if (ia->ia_addr < 1)
73		return 0;
74
75	/* XXXJRT filter addresses //at all// please? */
76
77	/* Bus independent probe */
78	sc = kmem_zalloc(sizeof(*sc), KM_SLEEP);
79	sc->sc_lmsc.lm_writereg = lm_i2c_writereg;
80	sc->sc_lmsc.lm_readreg = lm_i2c_readreg;
81	sc->sc_tag = ia->ia_tag;
82	sc->sc_addr = ia->ia_addr;
83	rv = lm_match(&sc->sc_lmsc);
84	kmem_free(sc, sizeof(*sc));
85
86	return rv ? I2C_MATCH_ADDRESS_AND_PROBE : 0;
87}
88
89
90void
91lm_i2c_attach(device_t parent, device_t self, void *aux)
92{
93	struct lm_i2c_softc *sc = device_private(self);
94	struct i2c_attach_args *ia = aux;
95
96	sc->sc_tag = ia->ia_tag;
97	sc->sc_addr = ia->ia_addr;
98
99	/* Bus-independent attachment */
100	sc->sc_lmsc.sc_dev = self;
101	sc->sc_lmsc.lm_writereg = lm_i2c_writereg;
102	sc->sc_lmsc.lm_readreg = lm_i2c_readreg;
103
104	lm_attach(&sc->sc_lmsc);
105}
106
107int
108lm_i2c_detach(device_t self, int flags)
109{
110	struct lm_i2c_softc *sc = device_private(self);
111
112	lm_detach(&sc->sc_lmsc);
113	return 0;
114}
115
116uint8_t
117lm_i2c_readreg(struct lm_softc *lmsc, int reg)
118{
119	struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc;
120	uint8_t cmd, data;
121
122	if (iic_acquire_bus(sc->sc_tag, 0))
123		return 0;
124
125	cmd = reg;
126	iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
127		 sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);
128
129	iic_release_bus(sc->sc_tag, 0);
130
131	return data;
132}
133
134
135void
136lm_i2c_writereg(struct lm_softc *lmsc, int reg, uint8_t val)
137{
138	struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc;
139	uint8_t cmd, data;
140
141	if (iic_acquire_bus(sc->sc_tag, 0))
142		return;
143
144	cmd = reg;
145	data = val;
146	iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
147		 sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);
148
149	iic_release_bus(sc->sc_tag, 0);
150}
151