1/*-
2 * Copyright (c) 2003-2009 RMI Corporation
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of RMI Corporation, nor the names of its contributors,
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * RMI_BSD */
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD$");
33/*
34 * temperature sensor chip sitting on the I2C bus.
35 */
36#include <sys/param.h>
37#include <sys/systm.h>
38#include <sys/kernel.h>
39#include <sys/lock.h>
40#include <sys/module.h>
41#include <sys/mutex.h>
42#include <sys/bus.h>
43#include <sys/resource.h>
44#include <sys/rman.h>
45#include <sys/sysctl.h>
46
47#include <machine/bus.h>
48#include <machine/cpu.h>
49#include <machine/cpufunc.h>
50#include <machine/frame.h>
51#include <machine/resource.h>
52
53#include <dev/iicbus/iiconf.h>
54#include <dev/iicbus/iicbus.h>
55
56#include <mips/rmi/board.h>
57#include <mips/rmi/rmi_boot_info.h>
58#include "iicbus_if.h"
59
60#define	MAX6657_EXT_TEMP	1
61
62struct max6657_softc {
63	uint32_t	sc_addr;
64	device_t	sc_dev;
65	int		sc_curtemp;
66	int		sc_lastupdate;	/* in ticks */
67};
68
69static void max6657_update(struct max6657_softc *);
70static int max6657_read(device_t dev, uint32_t addr, int reg) ;
71
72static int
73max6657_probe(device_t dev)
74{
75	device_set_desc(dev, "MAX6657MSA Temperature Sensor");
76	return (0);
77}
78
79static int
80max6657_sysctl_temp(SYSCTL_HANDLER_ARGS)
81{
82	struct max6657_softc *sc = arg1;
83	int temp;
84
85	max6657_update(sc);
86	temp = sc->sc_curtemp ;
87	return sysctl_handle_int(oidp, &temp, 0, req);
88}
89
90static int
91max6657_attach(device_t dev)
92{
93	struct max6657_softc *sc = device_get_softc(dev);
94	struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(dev);
95	struct sysctl_oid *tree = device_get_sysctl_tree(dev);
96
97	if(sc==NULL) {
98		printf("max6657_attach device_get_softc failed\n");
99		return (0);
100	}
101	sc->sc_dev = dev;
102	sc->sc_addr = iicbus_get_addr(dev);
103
104	SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
105		"temp", CTLTYPE_INT | CTLFLAG_RD, sc, 0,
106		max6657_sysctl_temp, "I", "operating temperature");
107
108	device_printf(dev, "Chip temperature {%d} Degree Celsius\n",
109		max6657_read(sc->sc_dev, sc->sc_addr, MAX6657_EXT_TEMP));
110
111	return (0);
112}
113
114static int
115max6657_read(device_t dev, uint32_t slave_addr, int reg)
116{
117	uint8_t addr = reg;
118	uint8_t data[1];
119	struct iic_msg msgs[2] = {
120	     { slave_addr, IIC_M_WR, 1, &addr },
121	     { slave_addr, IIC_M_RD, 1, data },
122	};
123
124	return iicbus_transfer(dev, msgs, 2) != 0 ? -1 : data[0];
125}
126
127
128static void
129max6657_update(struct max6657_softc *sc)
130{
131	int v;
132
133	/* NB: no point in updating any faster than the chip */
134	if (ticks - sc->sc_lastupdate > hz) {
135		v = max6657_read(sc->sc_dev, sc->sc_addr, MAX6657_EXT_TEMP);
136		if (v >= 0)
137			sc->sc_curtemp = v;
138		sc->sc_lastupdate = ticks;
139	}
140}
141
142static device_method_t max6657_methods[] = {
143	DEVMETHOD(device_probe,		max6657_probe),
144	DEVMETHOD(device_attach,	max6657_attach),
145
146	{0, 0},
147};
148
149static driver_t max6657_driver = {
150	"max6657",
151	max6657_methods,
152	sizeof(struct max6657_softc),
153};
154static devclass_t max6657_devclass;
155
156DRIVER_MODULE(max6657, iicbus, max6657_driver, max6657_devclass, 0, 0);
157MODULE_VERSION(max6657, 1);
158MODULE_DEPEND(max6657, iicbus, 1, 1, 1);
159