summaryrefslogtreecommitdiffstats
path: root/sys/mips/rmi/dev/iic/max6657.c
blob: 8d7006f66c03704475a04641073401731e061080 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
/*-
 * Copyright (c) 2003-2009 RMI Corporation
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of RMI Corporation, nor the names of its contributors,
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * RMI_BSD */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
 * temperature sensor chip sitting on the I2C bus.
 */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/bus.h>
#include <sys/resource.h>
#include <sys/rman.h>
#include <sys/sysctl.h>

#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/cpufunc.h>
#include <machine/frame.h>
#include <machine/resource.h>

#include <dev/iicbus/iiconf.h>
#include <dev/iicbus/iicbus.h>

#include <mips/rmi/board.h>
#include <mips/rmi/rmi_boot_info.h>
#include "iicbus_if.h"

#define	MAX6657_EXT_TEMP	1	

struct max6657_softc {
	uint32_t	sc_addr;
	device_t	sc_dev;
	int		sc_curtemp;
	int		sc_lastupdate;	/* in ticks */
};

static void max6657_update(struct max6657_softc *);
static int max6657_read(device_t dev, uint32_t addr, int reg) ;

static int
max6657_probe(device_t dev)
{
	device_set_desc(dev, "MAX6657MSA Temperature Sensor");
	return (0);
}

static int
max6657_sysctl_temp(SYSCTL_HANDLER_ARGS)
{
	struct max6657_softc *sc = arg1;
	int temp;

	max6657_update(sc);
	temp = sc->sc_curtemp ;
	return sysctl_handle_int(oidp, &temp, 0, req);
}

static int
max6657_attach(device_t dev)
{
	struct max6657_softc *sc = device_get_softc(dev);
	struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(dev);
	struct sysctl_oid *tree = device_get_sysctl_tree(dev);

	if(sc==NULL) {
		printf("max6657_attach device_get_softc failed\n");
		return (0);
	}
	sc->sc_dev = dev;
	sc->sc_addr = iicbus_get_addr(dev);

	SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
		"temp", CTLTYPE_INT | CTLFLAG_RD, sc, 0,
		max6657_sysctl_temp, "I", "operating temperature");

	device_printf(dev, "Chip temperature {%d} Degree Celsius\n",
		max6657_read(sc->sc_dev, sc->sc_addr, MAX6657_EXT_TEMP));

	return (0);
}

static int
max6657_read(device_t dev, uint32_t slave_addr, int reg) 
{
	uint8_t addr = reg;
	uint8_t data[1];
	struct iic_msg msgs[2] = {
	     { slave_addr, IIC_M_WR, 1, &addr },
	     { slave_addr, IIC_M_RD, 1, data },
	};

	return iicbus_transfer(dev, msgs, 2) != 0 ? -1 : data[0];
}


static void
max6657_update(struct max6657_softc *sc)
{
	int v;

	/* NB: no point in updating any faster than the chip */
	if (ticks - sc->sc_lastupdate > hz) {
		v = max6657_read(sc->sc_dev, sc->sc_addr, MAX6657_EXT_TEMP);
		if (v >= 0)
			sc->sc_curtemp = v;
		sc->sc_lastupdate = ticks;
	}
}

static device_method_t max6657_methods[] = {
	DEVMETHOD(device_probe,		max6657_probe),
	DEVMETHOD(device_attach,	max6657_attach),

	{0, 0},
};

static driver_t max6657_driver = {
	"max6657",
	max6657_methods,
	sizeof(struct max6657_softc),
};
static devclass_t max6657_devclass;

DRIVER_MODULE(max6657, iicbus, max6657_driver, max6657_devclass, 0, 0);
MODULE_VERSION(max6657, 1);
MODULE_DEPEND(max6657, iicbus, 1, 1, 1);
OpenPOWER on IntegriCloud